Viewing: gnilnd_cb.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2004 Cluster File Systems, Inc.
*
* Copyright (C) 2009-2012 Cray, Inc.
*/
/* This file is part of Lustre, http://www.lustre.org.
*
* Derived from work by Eric Barton <eric@bartonsoftware.com>
* Author: James Shimek <jshimek@cray.com>
* Author: Nic Henke <nic@cray.com>
*/
#include <asm/page.h>
#include <linux/nmi.h>
#include <linux/pagemap.h>
#include <lustre_compat/linux/linux-mem.h>
#include "gnilnd.h"
/* this is useful when needed to debug wire corruption. */
static void
kgnilnd_dump_blob(int level, char *prefix, void *buf, int len) {
__u64 *ptr;
ptr = (__u64 *) buf;
while (len > 0) {
if (len >= 32) {
CDEBUG(level,
"%s 0x%p: 0x%16.16llx 0x%16.16llx 0x%16.16llx 0x%16.16llx\n",
prefix, ptr, *(ptr), *(ptr + 1), *(ptr + 2), *(ptr + 3));
ptr += 4;
len -= 32;
} else if (len >= 16) {
CDEBUG(level,
"%s 0x%p: 0x%16.16llx 0x%16.16llx\n",
prefix, ptr, *(ptr), *(ptr + 1));
ptr += 2;
len -= 16;
} else {
CDEBUG(level, "%s 0x%p: 0x%16.16llx\n",
prefix, ptr, *(ptr));
ptr++;
len -= 8;
}
}
}
static void
kgnilnd_dump_msg(int mask, kgn_msg_t *msg)
{
CDEBUG(mask, "0x%8.8x 0x%4.4x 0x%4.4x 0x%16.16llx"
" 0x%16.16llx 0x%8.8x 0x%4.4x 0x%4.4x 0x%8.8x\n",
msg->gnm_magic, msg->gnm_version,
msg->gnm_type, msg->gnm_srcnid,
msg->gnm_connstamp, msg->gnm_seq,
msg->gnm_cksum, msg->gnm_payload_cksum,
msg->gnm_payload_len);
}
void
kgnilnd_schedule_device(kgn_device_t *dev)
{
short already_live = 0;
/* we'll only want to wake if the scheduler thread
* has come around and set ready to zero */
already_live = cmpxchg(&dev->gnd_ready, GNILND_DEV_IDLE, GNILND_DEV_IRQ);
if (!already_live)
wake_up(&dev->gnd_waitq);
}
void kgnilnd_schedule_device_timer(cfs_timer_cb_arg_t data)
{
kgn_device_t *dev = cfs_from_timer(dev, data, gnd_map_timer);
kgnilnd_schedule_device(dev);
}
void kgnilnd_schedule_device_timer_rd(cfs_timer_cb_arg_t data)
{
kgn_device_t *dev = cfs_from_timer(dev, data, gnd_rdmaq_timer);
kgnilnd_schedule_device(dev);
}
void
kgnilnd_device_callback(__u32 devid, __u64 arg)
{
kgn_device_t *dev;
int index = (int) arg;
if (index >= kgnilnd_data.kgn_ndevs) {
/* use _EMERG instead of an LBUG to prevent LBUG'ing in
* interrupt context. */
LCONSOLE_EMERG("callback for unknown device %d->%d\n",
devid, index);
return;
}
dev = &kgnilnd_data.kgn_devices[index];
/* just basic sanity */
if (dev->gnd_id == devid) {
kgnilnd_schedule_device(dev);
} else {
LCONSOLE_EMERG("callback for bad device %d devid %d\n",
dev->gnd_id, devid);
}
}
/* sched_intent values:
* < 0 : do not reschedule under any circumstances
* == 0: reschedule if someone marked him WANTS_SCHED
* > 0 : force a reschedule */
/* Return code 0 means it did not schedule the conn, 1
* means it successfully scheduled the conn.
*/
int
kgnilnd_schedule_process_conn(kgn_conn_t *conn, int sched_intent)
{
int conn_sched;
/* move back to IDLE but save previous state.
* if we see WANTS_SCHED, we'll call kgnilnd_schedule_conn and
* let the xchg there handle any racing callers to get it
* onto gnd_ready_conns */
conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_IDLE);
LASSERTF(conn_sched == GNILND_CONN_WANTS_SCHED ||
conn_sched == GNILND_CONN_PROCESS,
"conn %px after process in bad state: %d\n",
conn, conn_sched);
if (sched_intent >= 0) {
if ((sched_intent > 0 || (conn_sched == GNILND_CONN_WANTS_SCHED))) {
return kgnilnd_schedule_conn_refheld(conn, 1);
}
}
return 0;
}
/* Return of 0 for conn not scheduled, 1 returned if conn was scheduled or marked
* as scheduled */
int
_kgnilnd_schedule_conn(kgn_conn_t *conn, const char *caller, int line, int refheld, int lock_held)
{
kgn_device_t *dev = conn->gnc_device;
int sched;
int rc;
sched = xchg(&conn->gnc_scheduled, GNILND_CONN_WANTS_SCHED);
/* we only care about the last person who marked want_sched since they
* are most likely the culprit
*/
memcpy(conn->gnc_sched_caller, caller, sizeof(conn->gnc_sched_caller));
conn->gnc_sched_line = line;
/* if we are IDLE, add to list - only one guy sees IDLE and "wins"
* the chance to put it onto gnd_ready_conns.
* otherwise, leave marked as WANTS_SCHED and the thread that "owns"
* the conn in process_conns will take care of moving it back to
* SCHED when it is done processing */
if (sched == GNILND_CONN_IDLE) {
/* if the conn is already scheduled, we've already requested
* the scheduler thread wakeup */
if (!refheld) {
/* Add a reference to the conn if we are not holding a reference
* already from the exisiting scheduler. We now use the same
* reference if we need to reschedule a conn while in a scheduler
* thread.
*/
kgnilnd_conn_addref(conn);
}
LASSERTF(list_empty(&conn->gnc_schedlist),
"conn %px already sched state %d\n",
conn, sched);
CDEBUG(D_INFO, "scheduling conn 0x%p caller %s:%d\n", conn, caller, line);
if (!lock_held)
spin_lock(&dev->gnd_lock);
list_add_tail(&conn->gnc_schedlist, &dev->gnd_ready_conns);
if (!lock_held)
spin_unlock(&dev->gnd_lock);
set_mb(conn->gnc_last_sched_ask, jiffies);
rc = 1;
} else {
CDEBUG(D_INFO, "not scheduling conn 0x%p: %d caller %s:%d\n", conn, sched, caller, line);
rc = 0;
}
/* make sure thread(s) going to process conns - but let it make
* separate decision from conn schedule */
if (!lock_held)
kgnilnd_schedule_device(dev);
return rc;
}
int
_kgnilnd_schedule_delay_conn(kgn_conn_t *conn)
{
kgn_device_t *dev = conn->gnc_device;
int rc = 0;
spin_lock(&dev->gnd_lock);
if (list_empty(&conn->gnc_delaylist)) {
list_add_tail(&conn->gnc_delaylist, &dev->gnd_delay_conns);
rc = 1;
}
spin_unlock(&dev->gnd_lock);
kgnilnd_schedule_device(dev);
return rc;
}
void
kgnilnd_schedule_dgram(kgn_device_t *dev)
{
int wake;
wake = xchg(&dev->gnd_dgram_ready, GNILND_DGRAM_SCHED);
if (wake != GNILND_DGRAM_SCHED) {
wake_up(&dev->gnd_dgram_waitq);
} else {
CDEBUG(D_NETTRACE, "not waking: %d\n", wake);
}
}
void
kgnilnd_free_tx(kgn_tx_t *tx)
{
/* taken from kgnilnd_tx_add_state_locked */
LASSERTF((tx->tx_list_p == NULL &&
tx->tx_list_state == GNILND_TX_ALLOCD) &&
list_empty(&tx->tx_list),
"tx %px with bad state %s (list_p %px) tx_list %s\n",
tx, kgnilnd_tx_state2str(tx->tx_list_state), tx->tx_list_p,
list_empty(&tx->tx_list) ? "empty" : "not empty");
atomic_dec(&kgnilnd_data.kgn_ntx);
/* we only allocate this if we need to */
if (tx->tx_phys != NULL) {
kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
LIBCFS_MEM_MSG(tx->tx_phys,
GNILND_MAX_IOV * sizeof(gni_mem_segment_t),
"slab-freed");
}
/* Only free the buffer if we used it */
if (tx->tx_buffer_copy != NULL) {
LIBCFS_MEM_MSG(tx->tx_buffer_copy, tx->tx_rdma_desc.length,
"vfreed");
kgnilnd_vfree(tx->tx_buffer_copy, tx->tx_rdma_desc.length);
tx->tx_buffer_copy = NULL;
}
#if 0
KGNILND_POISON(tx, 0x5a, sizeof(kgn_tx_t));
#endif
LIBCFS_MEM_MSG(tx, sizeof(*tx), "slab-freed");
kmem_cache_free(kgnilnd_data.kgn_tx_cache, tx);
}
kgn_tx_t *
kgnilnd_alloc_tx (void)
{
kgn_tx_t *tx = NULL;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ALLOC_TX))
return tx;
tx = kmem_cache_zalloc(kgnilnd_data.kgn_tx_cache, GFP_ATOMIC);
if (tx == NULL) {
CERROR("failed to allocate tx\n");
return NULL;
}
LIBCFS_MEM_MSG(tx, sizeof(*tx), "slab-alloced");
/* setup everything here to minimize time under the lock */
tx->tx_buftype = GNILND_BUF_NONE;
tx->tx_msg.gnm_type = GNILND_MSG_NONE;
INIT_LIST_HEAD(&tx->tx_list);
INIT_LIST_HEAD(&tx->tx_map_list);
tx->tx_list_state = GNILND_TX_ALLOCD;
atomic_inc(&kgnilnd_data.kgn_ntx);
return tx;
}
/* csum_fold needs to be run on the return value before shipping over the wire */
#define _kgnilnd_cksum(seed, ptr, nob) csum_partial(ptr, nob, seed)
/* we don't use offset as every one is passing a buffer reference that already
* includes the offset into the base address.
*/
static inline __u16
kgnilnd_cksum(void *ptr, size_t nob)
{
__u16 sum;
sum = csum_fold(_kgnilnd_cksum(0, ptr, nob));
/* don't use magic 'no checksum' value */
if (sum == 0)
sum = 1;
CDEBUG(D_INFO, "cksum 0x%x for ptr 0x%p sz %zu\n",
sum, ptr, nob);
return sum;
}
__u16
kgnilnd_cksum_kiov(unsigned int nkiov, struct bio_vec *kiov,
unsigned int offset, unsigned int nob, int dump_blob)
{
__wsum cksum = 0;
__wsum tmpck;
__u16 retsum;
void *addr;
unsigned int fraglen;
int i, odd;
LASSERT(nkiov > 0);
LASSERT(nob > 0);
CDEBUG(D_BUFFS, "calc cksum for kiov 0x%p nkiov %u offset %u nob %u, dump %d\n",
kiov, nkiov, offset, nob, dump_blob);
/* if loops changes, please change kgnilnd_setup_phys_buffer */
while (offset >= kiov->bv_len) {
offset -= kiov->bv_len;
nkiov--;
kiov++;
LASSERT(nkiov > 0);
}
/* ignore nob here, if nob < (bv_len - offset), kiov == 1 */
odd = (unsigned long) (kiov[0].bv_len - offset) & 1;
if ((odd || *kgnilnd_tunables.kgn_vmap_cksum) && nkiov > 1) {
struct page **pages = kgnilnd_data.kgn_cksum_map_pages[get_cpu()];
LASSERTF(pages != NULL, "NULL pages for cpu %d map_pages 0x%p\n",
get_cpu(), kgnilnd_data.kgn_cksum_map_pages);
CDEBUG(D_BUFFS, "odd %d len %u offset %u nob %u\n",
odd, kiov[0].bv_len, offset, nob);
for (i = 0; i < nkiov; i++) {
pages[i] = kiov[i].bv_page;
}
addr = vmap(pages, nkiov, VM_MAP, PAGE_KERNEL);
if (addr == NULL) {
CNETERR("Couldn't vmap %d frags on %d bytes to avoid odd length fragment in cksum\n",
nkiov, nob);
/* return zero to avoid killing tx - we'll just get warning on console
* when remote end sees zero checksum */
RETURN(0);
}
atomic_inc(&kgnilnd_data.kgn_nvmap_cksum);
tmpck = _kgnilnd_cksum(0, ((void *) addr + kiov[0].bv_offset +
offset), nob);
cksum = tmpck;
if (dump_blob) {
kgnilnd_dump_blob(D_BUFFS, "flat kiov RDMA payload",
(void *)addr + kiov[0].bv_offset +
offset, nob);
}
CDEBUG(D_BUFFS, "cksum 0x%x (+0x%x) for addr 0x%p+%u len %u offset %u\n",
cksum, tmpck, addr, kiov[0].bv_offset, nob, offset);
vunmap(addr);
} else {
do {
void *kaddr;
fraglen = min(kiov->bv_len - offset, nob);
/* make dang sure we don't send a bogus checksum if somehow we get
* an odd length fragment on anything but the last entry in a kiov -
* we know from kgnilnd_setup_rdma_buffer that we can't have non
* PAGE_SIZE pages in the middle, so if nob < PAGE_SIZE, it is the last one */
LASSERTF(!(fraglen&1) || (nob < PAGE_SIZE),
"odd fraglen %u on nkiov %d, nob %u bv_len %u offset %u kiov 0x%p\n",
fraglen, nkiov, nob, kiov->bv_len,
offset, kiov);
kaddr = kmap_local_page(kiov->bv_page);
addr = kaddr + kiov->bv_offset + offset;
tmpck = _kgnilnd_cksum(cksum, addr, fraglen);
CDEBUG(D_BUFFS,
"cksum 0x%x (+0x%x) for page 0x%p+%u (0x%p) len %u offset %u\n",
cksum, tmpck, kiov->bv_page, kiov->bv_offset,
addr, fraglen, offset);
cksum = tmpck;
if (dump_blob)
kgnilnd_dump_blob(D_BUFFS, "kiov cksum", addr, fraglen);
kunmap_local(kaddr);
kiov++;
nkiov--;
nob -= fraglen;
offset = 0;
/* iov must not run out before end of data */
LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
} while (nob > 0);
}
retsum = csum_fold(cksum);
/* don't use magic 'no checksum' value */
if (retsum == 0)
retsum = 1;
CDEBUG(D_BUFFS, "retsum 0x%x from cksum 0x%x\n", retsum, cksum);
return retsum;
}
void
kgnilnd_init_msg(kgn_msg_t *msg, int type, lnet_nid_t source)
{
msg->gnm_magic = GNILND_MSG_MAGIC;
msg->gnm_version = GNILND_MSG_VERSION;
msg->gnm_type = type;
msg->gnm_payload_len = 0;
msg->gnm_srcnid = source;
/* gnm_connstamp gets set when FMA is sent */
/* gnm_srcnid is set on creation via function argument
* The right interface/net and nid is passed in when the message
* is created.
*/
}
kgn_tx_t *
kgnilnd_new_tx_msg(int type, lnet_nid_t source)
{
kgn_tx_t *tx = kgnilnd_alloc_tx();
if (tx != NULL) {
kgnilnd_init_msg(&tx->tx_msg, type, source);
} else {
CERROR("couldn't allocate new tx type %s!\n",
kgnilnd_msgtype2str(type));
}
return tx;
}
static void
kgnilnd_nak_rdma(kgn_conn_t *conn, int rx_type, int error, __u64 cookie, lnet_nid_t source) {
kgn_tx_t *tx;
int nak_type;
switch (rx_type) {
case GNILND_MSG_GET_REQ:
case GNILND_MSG_GET_DONE:
nak_type = GNILND_MSG_GET_NAK;
break;
case GNILND_MSG_PUT_REQ:
case GNILND_MSG_PUT_ACK:
case GNILND_MSG_PUT_DONE:
nak_type = GNILND_MSG_PUT_NAK;
break;
case GNILND_MSG_PUT_REQ_REV:
case GNILND_MSG_PUT_DONE_REV:
nak_type = GNILND_MSG_PUT_NAK_REV;
break;
case GNILND_MSG_GET_REQ_REV:
case GNILND_MSG_GET_ACK_REV:
case GNILND_MSG_GET_DONE_REV:
nak_type = GNILND_MSG_GET_NAK_REV;
break;
default:
CERROR("invalid msg type %s (%d)\n",
kgnilnd_msgtype2str(rx_type), rx_type);
LBUG();
}
/* only allow NAK on error and truncate to zero */
LASSERTF(error <= 0, "error %d conn 0x%p, cookie %llu\n",
error, conn, cookie);
tx = kgnilnd_new_tx_msg(nak_type, source);
if (tx == NULL) {
CNETERR("can't get TX to NAK RDMA to %s\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid));
return;
}
tx->tx_msg.gnm_u.completion.gncm_retval = error;
tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
kgnilnd_queue_tx(conn, tx);
}
static int
kgnilnd_setup_immediate_buffer(kgn_tx_t *tx, unsigned int niov,
struct bio_vec *kiov,
unsigned int offset, unsigned int nob)
{
kgn_msg_t *msg = &tx->tx_msg;
int i;
/* To help save on MDDs for short messages, we'll vmap a kiov to allow
* gni_smsg_send to send that as the payload */
LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
if (nob == 0) {
tx->tx_buffer = NULL;
} else {
if (niov && niov > (nob >> PAGE_SHIFT))
niov = DIV_ROUND_UP(nob + offset + kiov->bv_offset,
PAGE_SIZE);
while (offset >= kiov->bv_len) {
offset -= kiov->bv_len;
niov--;
kiov++;
LASSERT(niov > 0);
}
LASSERTF(niov > 0 && niov < GNILND_MAX_IMMEDIATE/PAGE_SIZE,
"bad niov %d msg %px kiov %px offset %d nob%d\n",
niov, msg, kiov, offset, nob);
for (i = 0; i < niov; i++) {
/* We can't have a bv_offset on anything but the first
* entry, otherwise we'll have a hole at the end of the
* mapping as we only map whole pages.
* Also, if we have a bv_len < PAGE_SIZE but we need to
* map more than bv_len, we will also have a whole at
* the end of that page which isn't allowed
*/
if ((kiov[i].bv_offset != 0 && i > 0) ||
(kiov[i].bv_offset + kiov[i].bv_len != PAGE_SIZE &&
i < niov - 1)) {
CNETERR("Can't make payload contiguous in I/O VM:page %d, offset %u, nob %u, bv_offset %u bv_len %u\n",
i, offset, nob, kiov->bv_offset,
kiov->bv_len);
RETURN(-EINVAL);
}
tx->tx_imm_pages[i] = kiov[i].bv_page;
}
/* hijack tx_phys for the later unmap */
if (niov == 1) {
/* tx->phyx being equal to NULL is the signal for unmap to discern between kmap and vmap */
tx->tx_phys = NULL;
tx->tx_buffer = (void *)kmap(tx->tx_imm_pages[0]) +
kiov[0].bv_offset + offset;
atomic_inc(&kgnilnd_data.kgn_nkmap_short);
GNIDBG_TX(D_NET, tx, "kmapped page for %d bytes for kiov 0x%p, buffer 0x%p",
nob, kiov, tx->tx_buffer);
} else {
tx->tx_phys = vmap(tx->tx_imm_pages, niov, VM_MAP, PAGE_KERNEL);
if (tx->tx_phys == NULL) {
CNETERR("Couldn't vmap %d frags on %d bytes\n", niov, nob);
RETURN(-ENOMEM);
}
atomic_inc(&kgnilnd_data.kgn_nvmap_short);
/* make sure we take into account the kiov offset as the
* start of the buffer
*/
tx->tx_buffer = (void *)tx->tx_phys + kiov[0].bv_offset
+ offset;
GNIDBG_TX(D_NET, tx,
"mapped %d pages for %d bytes from kiov 0x%p to 0x%p, buffer 0x%p",
niov, nob, kiov, tx->tx_phys, tx->tx_buffer);
}
tx->tx_buftype = GNILND_BUF_IMMEDIATE_KIOV;
tx->tx_nob = nob;
}
/* checksum payload early - it shouldn't be changing after lnd_send */
if (*kgnilnd_tunables.kgn_checksum >= 2) {
msg->gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM2)) {
msg->gnm_payload_cksum += 0xe00e;
}
if (*kgnilnd_tunables.kgn_checksum_dump > 1) {
kgnilnd_dump_blob(D_BUFFS, "payload checksum",
tx->tx_buffer, nob);
}
} else {
msg->gnm_payload_cksum = 0;
}
return 0;
}
int
kgnilnd_setup_phys_buffer(kgn_tx_t *tx, int nkiov, struct bio_vec *kiov,
unsigned int offset, unsigned int nob)
{
gni_mem_segment_t *phys;
int rc = 0;
unsigned int fraglen;
GNIDBG_TX(D_NET, tx, "niov %d kiov 0x%p offset %u nob %u", nkiov, kiov, offset, nob);
LASSERT(nob > 0);
LASSERT(nkiov > 0);
LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
/* only allocate this if we are going to use it */
tx->tx_phys = kmem_cache_alloc(kgnilnd_data.kgn_tx_phys_cache,
GFP_ATOMIC);
if (tx->tx_phys == NULL) {
CERROR("failed to allocate tx_phys\n");
rc = -ENOMEM;
GOTO(error, rc);
}
LIBCFS_MEM_MSG(tx->tx_phys,
GNILND_MAX_IOV * sizeof(gni_mem_segment_t),
"slab-alloced");
/* if loops changes, please change kgnilnd_cksum_kiov
* and kgnilnd_setup_immediate_buffer */
while (offset >= kiov->bv_len) {
offset -= kiov->bv_len;
nkiov--;
kiov++;
LASSERT(nkiov > 0);
}
/* at this point, kiov points to the first page that we'll actually map
* now that we've seeked into the koiv for offset and dropped any
* leading pages that fall entirely within the offset */
tx->tx_buftype = GNILND_BUF_PHYS_UNMAPPED;
tx->tx_nob = nob;
/* bv_offset is start of 'valid' buffer, so index offset past that */
tx->tx_buffer = (void *)((unsigned long)(kiov->bv_offset + offset));
phys = tx->tx_phys;
CDEBUG(D_NET, "tx 0x%p buffer 0x%p map start kiov 0x%p+%u niov %d offset %u\n",
tx, tx->tx_buffer, kiov, kiov->bv_offset, nkiov, offset);
do {
fraglen = min(kiov->bv_len - offset, nob);
/* We can't have a bv_offset on anything but the first entry,
* otherwise we'll have a hole at the end of the mapping as we
* only map whole pages. Only the first page is allowed to
* have an offset - we'll add that into tx->tx_buffer and that
* will get used when we map in the segments (see
* kgnilnd_map_buffer). Also, if we have a bv_len < PAGE_SIZE
* but we need to map more than bv_len, we will also have a
* whole at the end of that page which isn't allowed
*/
if ((phys != tx->tx_phys) &&
((kiov->bv_offset != 0) ||
((kiov->bv_len < PAGE_SIZE) && (nob > kiov->bv_len)))) {
CERROR("Can't make payload contiguous in I/O VM:page %d, offset %u, nob %u, bv_offset %u bv_len %u\n",
(int)(phys - tx->tx_phys),
offset, nob, kiov->bv_offset, kiov->bv_len);
rc = -EINVAL;
GOTO(error, rc);
}
if ((phys - tx->tx_phys) == GNILND_MAX_IOV) {
CERROR ("payload too big (%d)\n", (int)(phys - tx->tx_phys));
rc = -EMSGSIZE;
GOTO(error, rc);
}
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PHYS_SETUP)) {
rc = -EINVAL;
GOTO(error, rc);
}
CDEBUG(D_BUFFS,
"page 0x%p bv_offset %u bv_len %u nob %u nkiov %u offset %u\n",
kiov->bv_page, kiov->bv_offset, kiov->bv_len, nob, nkiov,
offset);
phys->address = page_to_phys(kiov->bv_page);
phys++;
kiov++;
nkiov--;
nob -= fraglen;
offset = 0;
/* iov must not run out before end of data */
LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
} while (nob > 0);
tx->tx_phys_npages = phys - tx->tx_phys;
return 0;
error:
if (tx->tx_phys != NULL) {
kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
LIBCFS_MEM_MSG(tx->tx_phys, sizeof(*tx->tx_phys), "slab-freed");
tx->tx_phys = NULL;
}
return rc;
}
static inline int
kgnilnd_setup_rdma_buffer(kgn_tx_t *tx, unsigned int niov,
struct bio_vec *kiov,
unsigned int offset, unsigned int nob)
{
return kgnilnd_setup_phys_buffer(tx, niov, kiov, offset, nob);
}
/* kgnilnd_parse_lnet_rdma()
* lntmsg - message passed in from lnet.
* niov, kiov, offset - see lnd_t in lib-types.h for descriptions.
* nob - actual number of bytes to in this message.
* put_len - It is possible for PUTs to have a different length than the
* length stored in lntmsg->msg_len since LNET can adjust this
* length based on it's buffer size and offset.
* lnet_try_match_md() sets the mlength that we use to do the RDMA
* transfer.
*/
static void
kgnilnd_parse_lnet_rdma(struct lnet_msg *lntmsg, unsigned int *niov,
unsigned int *offset, unsigned int *nob,
struct bio_vec **kiov, int put_len)
{
/* GETs are weird, see kgnilnd_send */
if (lntmsg->msg_type == LNET_MSG_GET) {
if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0) {
*kiov = NULL;
} else {
*kiov = lntmsg->msg_md->md_kiov;
}
*niov = lntmsg->msg_md->md_niov;
*nob = lntmsg->msg_md->md_length;
*offset = 0;
} else {
*kiov = lntmsg->msg_kiov;
*niov = lntmsg->msg_niov;
*nob = put_len;
*offset = lntmsg->msg_offset;
}
}
static inline void
kgnilnd_compute_rdma_cksum(kgn_tx_t *tx, int put_len)
{
unsigned int niov, offset, nob;
struct bio_vec *kiov;
struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
int dump_cksum = (*kgnilnd_tunables.kgn_checksum_dump > 1);
GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE) ||
(tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV)),
"bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV)) {
tx->tx_msg.gnm_payload_cksum = 0;
return;
}
if (*kgnilnd_tunables.kgn_checksum < 3) {
tx->tx_msg.gnm_payload_cksum = 0;
return;
}
GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov,
put_len);
if (kiov != NULL) {
tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, dump_cksum);
} else {
tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
if (dump_cksum) {
kgnilnd_dump_blob(D_BUFFS, "peer RDMA payload", tx->tx_buffer, nob);
}
}
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM3)) {
tx->tx_msg.gnm_payload_cksum += 0xd00d;
}
}
/* kgnilnd_verify_rdma_cksum()
* tx - PUT_DONE/GET_DONE matched tx.
* rx_cksum - received checksum to compare against.
* put_len - see kgnilnd_parse_lnet_rdma comments.
*/
static inline int
kgnilnd_verify_rdma_cksum(kgn_tx_t *tx, __u16 rx_cksum, int put_len)
{
int rc = 0;
__u16 cksum;
unsigned int niov, offset, nob;
struct bio_vec *kiov;
struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
int dump_on_err = *kgnilnd_tunables.kgn_checksum_dump;
/* we can only match certain requests */
GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) ||
(tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK) ||
(tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV)),
"bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
(tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV)) {
return 0;
}
if (rx_cksum == 0) {
if (*kgnilnd_tunables.kgn_checksum >= 3) {
GNIDBG_MSG(D_WARNING, &tx->tx_msg,
"no RDMA payload checksum when enabled");
}
return 0;
}
GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, put_len);
if (kiov != NULL) {
cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, 0);
} else {
cksum = kgnilnd_cksum(tx->tx_buffer, nob);
}
if (cksum != rx_cksum) {
GNIDBG_MSG(D_NETERROR, &tx->tx_msg,
"Bad RDMA payload checksum (%x expected %x); "
"kiov 0x%p niov %d nob %u offset %u",
cksum, rx_cksum, kiov, niov, nob, offset);
switch (dump_on_err) {
case 2:
if (kiov != NULL) {
kgnilnd_cksum_kiov(niov, kiov, offset, nob, 1);
} else {
kgnilnd_dump_blob(D_BUFFS, "RDMA payload",
tx->tx_buffer, nob);
}
fallthrough;
case 1:
libcfs_debug_dumplog();
break;
default:
break;
}
rc = -ENOKEY;
/* kgnilnd_check_fma_rx will close conn, kill tx with error */
}
return rc;
}
void
kgnilnd_mem_add_map_list(kgn_device_t *dev, kgn_tx_t *tx)
{
int bytes;
GNITX_ASSERTF(tx, list_empty(&tx->tx_map_list),
"already mapped!", NULL);
spin_lock(&dev->gnd_map_lock);
switch (tx->tx_buftype) {
default:
GNIDBG_TX(D_EMERG, tx,
"SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
spin_unlock(&dev->gnd_map_lock);
LBUG();
break;
case GNILND_BUF_PHYS_MAPPED:
bytes = tx->tx_phys_npages * PAGE_SIZE;
dev->gnd_map_nphys++;
dev->gnd_map_physnop += tx->tx_phys_npages;
break;
}
if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
atomic64_add(bytes, &dev->gnd_rdmaq_bytes_out);
GNIDBG_TX(D_NETTRACE, tx, "rdma ++ %d to %lld",
bytes, atomic64_read(&dev->gnd_rdmaq_bytes_out));
}
atomic_inc(&dev->gnd_n_mdd);
atomic64_add(bytes, &dev->gnd_nbytes_map);
/* clear retrans to prevent any SMSG goofiness as that code uses the same counter */
tx->tx_retrans = 0;
/* we only get here in the valid cases */
list_add_tail(&tx->tx_map_list, &dev->gnd_map_list);
dev->gnd_map_version++;
spin_unlock(&dev->gnd_map_lock);
}
void
kgnilnd_mem_del_map_list(kgn_device_t *dev, kgn_tx_t *tx)
{
int bytes;
GNITX_ASSERTF(tx, !list_empty(&tx->tx_map_list),
"not mapped!", NULL);
spin_lock(&dev->gnd_map_lock);
switch (tx->tx_buftype) {
default:
GNIDBG_TX(D_EMERG, tx,
"SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
spin_unlock(&dev->gnd_map_lock);
LBUG();
break;
case GNILND_BUF_PHYS_UNMAPPED:
bytes = tx->tx_phys_npages * PAGE_SIZE;
dev->gnd_map_nphys--;
dev->gnd_map_physnop -= tx->tx_phys_npages;
break;
}
if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
atomic64_sub(bytes, &dev->gnd_rdmaq_bytes_out);
LASSERTF(atomic64_read(&dev->gnd_rdmaq_bytes_out) >= 0,
"bytes_out negative! %lld\n",
(s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
GNIDBG_TX(D_NETTRACE, tx, "rdma -- %d to %lld",
bytes, (s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
}
atomic_dec(&dev->gnd_n_mdd);
atomic64_sub(bytes, &dev->gnd_nbytes_map);
/* we only get here in the valid cases */
list_del_init(&tx->tx_map_list);
dev->gnd_map_version++;
spin_unlock(&dev->gnd_map_lock);
}
int
kgnilnd_map_buffer(kgn_tx_t *tx)
{
kgn_conn_t *conn = tx->tx_conn;
kgn_device_t *dev = conn->gnc_device;
__u32 flags = GNI_MEM_READWRITE;
gni_return_t rrc;
/* The kgnilnd_mem_register(_segments) Gemini Driver functions can
* be called concurrently as there are internal locks that protect
* any data structures or HW resources. We just need to ensure
* that our concurrency doesn't result in the kgn_device_t
* getting nuked while we are in here */
LASSERTF(conn != NULL, "tx %px with NULL conn, someone forgot"
" to set tx_conn before calling %s\n", tx, __FUNCTION__);
if (unlikely(CFS_FAIL_CHECK(CFS_FAIL_GNI_MAP_TX)))
RETURN(-ENOMEM);
if (*kgnilnd_tunables.kgn_bte_relaxed_ordering) {
flags |= GNI_MEM_RELAXED_PI_ORDERING;
}
switch (tx->tx_buftype) {
default:
LBUG();
case GNILND_BUF_NONE:
case GNILND_BUF_IMMEDIATE:
case GNILND_BUF_IMMEDIATE_KIOV:
case GNILND_BUF_PHYS_MAPPED:
return 0;
case GNILND_BUF_PHYS_UNMAPPED:
GNITX_ASSERTF(tx, tx->tx_phys != NULL, "physical buffer not there!", NULL);
rrc = kgnilnd_mem_register_segments(dev->gnd_handle,
tx->tx_phys, tx->tx_phys_npages, NULL,
GNI_MEM_PHYS_SEGMENTS | flags,
&tx->tx_map_key);
/* could race with other uses of the map counts, but this is ok
* - this needs to turn into a non-fatal error soon to allow
* GART resource, etc starvation handling */
if (rrc != GNI_RC_SUCCESS) {
GNIDBG_TX(D_NET, tx,
"Can't map %d pages: dev %d phys %u pp %u",
tx->tx_phys_npages, dev->gnd_id,
dev->gnd_map_nphys, dev->gnd_map_physnop);
RETURN(rrc == GNI_RC_ERROR_RESOURCE ? -ENOMEM : -EINVAL);
}
tx->tx_buftype = GNILND_BUF_PHYS_MAPPED;
kgnilnd_mem_add_map_list(dev, tx);
return 0;
}
}
void
kgnilnd_add_purgatory_tx(kgn_tx_t *tx)
{
kgn_conn_t *conn = tx->tx_conn;
kgn_mdd_purgatory_t *gmp;
LIBCFS_ALLOC(gmp, sizeof(*gmp));
LASSERTF(gmp != NULL, "couldn't allocate MDD purgatory member;"
" asserting to avoid data corruption\n");
if (tx->tx_buffer_copy)
gmp->gmp_map_key = tx->tx_buffer_copy_map_key;
else
gmp->gmp_map_key = tx->tx_map_key;
atomic_inc(&conn->gnc_device->gnd_n_mdd_held);
/* ensure that we don't have a blank purgatory - indicating the
* conn is not already on purgatory lists - we'd never recover these
* MDD if that were the case */
GNITX_ASSERTF(tx, conn->gnc_in_purgatory,
"conn 0x%p->%s with NULL purgatory",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
/* link 'er up! - only place we really need to lock for
* concurrent access */
spin_lock(&conn->gnc_list_lock);
list_add_tail(&gmp->gmp_list, &conn->gnc_mdd_list);
spin_unlock(&conn->gnc_list_lock);
}
void
kgnilnd_unmap_buffer(kgn_tx_t *tx, int error)
{
kgn_device_t *dev;
gni_return_t rrc;
int hold_timeout = 0;
/* code below relies on +1 relationship ... */
BUILD_BUG_ON(GNILND_BUF_PHYS_MAPPED !=
(GNILND_BUF_PHYS_UNMAPPED + 1));
switch (tx->tx_buftype) {
default:
LBUG();
case GNILND_BUF_NONE:
case GNILND_BUF_IMMEDIATE:
case GNILND_BUF_PHYS_UNMAPPED:
break;
case GNILND_BUF_IMMEDIATE_KIOV:
if (tx->tx_phys != NULL) {
vunmap(tx->tx_phys);
} else if (tx->tx_phys == NULL && tx->tx_buffer != NULL) {
kunmap(tx->tx_imm_pages[0]);
}
/* clear to prevent kgnilnd_free_tx from thinking
* this is a RDMA descriptor */
tx->tx_phys = NULL;
break;
case GNILND_BUF_PHYS_MAPPED:
LASSERT(tx->tx_conn != NULL);
dev = tx->tx_conn->gnc_device;
/* only want to hold if we are closing conn without
* verified peer notification - the theory is that
* a TX error can be communicated in all other cases */
if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED &&
error != -GNILND_NOPURG &&
kgnilnd_check_purgatory_conn(tx->tx_conn)) {
kgnilnd_add_purgatory_tx(tx);
/* The timeout we give to kgni is a deadman stop only.
* we are setting high to ensure we don't have the kgni timer
* fire before ours fires _and_ is handled */
hold_timeout = GNILND_TIMEOUT2DEADMAN;
GNIDBG_TX(D_NET, tx,
"dev %p delaying MDD release for %dms key %#llx.%#llx",
tx->tx_conn->gnc_device, hold_timeout,
tx->tx_map_key.qword1, tx->tx_map_key.qword2);
}
if (tx->tx_buffer_copy != NULL) {
rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_buffer_copy_map_key, hold_timeout);
LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, 0);
LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
} else {
rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, hold_timeout);
LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
}
tx->tx_buftype--;
kgnilnd_mem_del_map_list(dev, tx);
break;
}
}
void
kgnilnd_tx_done(kgn_tx_t *tx, int completion)
{
struct lnet_msg *lntmsg0, *lntmsg1;
int status0, status1;
struct lnet_ni *ni = NULL;
kgn_conn_t *conn = tx->tx_conn;
LASSERT(!in_interrupt());
lntmsg0 = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
lntmsg1 = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
if (completion &&
!(tx->tx_state & GNILND_TX_QUIET_ERROR) &&
!kgnilnd_conn_clean_errno(completion)) {
GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
"error %d on tx 0x%p->%s id %u/%d state %s age %ds",
completion, tx, conn ?
libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
kgnilnd_tx_state2str(tx->tx_list_state),
cfs_duration_sec((unsigned long)jiffies - tx->tx_qtime));
}
/* The error codes determine if we hold onto the MDD */
kgnilnd_unmap_buffer(tx, completion);
/* we have to deliver a reply on lntmsg[1] for the GET, so make sure
* we play nice with the error codes to avoid delivering a failed
* REQUEST and then a REPLY event as well */
/* return -EIO to lnet - it is the magic value for failed sends */
if (tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
status0 = 0;
status1 = completion;
} else {
status0 = status1 = completion;
}
tx->tx_buftype = GNILND_BUF_NONE;
tx->tx_msg.gnm_type = GNILND_MSG_NONE;
/* lnet_finalize doesn't do anything with the *ni, so ok for us to
* set NULL when we are a tx without a conn */
if (conn != NULL) {
ni = conn->gnc_peer->gnp_net->gnn_ni;
spin_lock(&conn->gnc_tx_lock);
LASSERTF(test_and_clear_bit(tx->tx_id.txe_idx,
(volatile unsigned long *)&conn->gnc_tx_bits),
"conn %px tx %px bit %d already cleared\n",
conn, tx, tx->tx_id.txe_idx);
LASSERTF(conn->gnc_tx_ref_table[tx->tx_id.txe_idx] != NULL,
"msg_id %d already NULL\n", tx->tx_id.txe_idx);
conn->gnc_tx_ref_table[tx->tx_id.txe_idx] = NULL;
spin_unlock(&conn->gnc_tx_lock);
}
kgnilnd_free_tx(tx);
/* finalize AFTER freeing lnet msgs */
/* warning - we should hold no locks here - calling lnet_finalize
* could free up lnet credits, resulting in a call chain back into
* the LND via kgnilnd_send and friends */
lnet_finalize(lntmsg0, status0);
if (lntmsg1 != NULL) {
lnet_finalize(lntmsg1, status1);
}
}
void
kgnilnd_txlist_done(struct list_head *txlist, int error)
{
kgn_tx_t *tx, *txn;
int err_printed = 0;
if (list_empty(txlist))
return;
list_for_each_entry_safe(tx, txn, txlist, tx_list) {
/* only print the first error */
if (err_printed)
tx->tx_state |= GNILND_TX_QUIET_ERROR;
list_del_init(&tx->tx_list);
kgnilnd_tx_done(tx, error);
err_printed++;
}
}
int
kgnilnd_set_tx_id(kgn_tx_t *tx, kgn_conn_t *conn)
{
int id;
spin_lock(&conn->gnc_tx_lock);
/* ID zero is NOT ALLOWED!!! */
search_again:
id = find_next_zero_bit((unsigned long *)&conn->gnc_tx_bits,
GNILND_MAX_MSG_ID, conn->gnc_next_tx);
if (id == GNILND_MAX_MSG_ID) {
if (conn->gnc_next_tx != 1) {
/* we only searched from next_tx to end and didn't find
* one, so search again from start */
conn->gnc_next_tx = 1;
goto search_again;
}
/* couldn't find one! */
spin_unlock(&conn->gnc_tx_lock);
return -E2BIG;
}
/* bump next_tx to prevent immediate reuse */
conn->gnc_next_tx = id + 1;
set_bit(id, (volatile unsigned long *)&conn->gnc_tx_bits);
LASSERTF(conn->gnc_tx_ref_table[id] == NULL,
"tx 0x%p already at id %d\n",
conn->gnc_tx_ref_table[id], id);
/* delay these until we have a valid ID - prevents bad clear of the bit
* in kgnilnd_tx_done */
tx->tx_conn = conn;
tx->tx_id.txe_cqid = conn->gnc_cqid;
tx->tx_id.txe_idx = id;
conn->gnc_tx_ref_table[id] = tx;
/* Using jiffies to help differentiate against TX reuse - with
* the usual minimum of a 250HZ clock, we wrap jiffies on the same TX
* if we are sending to the same node faster than 256000/sec.
* To help guard against this, we OR in the tx_seq - that is 32 bits */
tx->tx_id.txe_chips = (__u32)(jiffies | atomic_read(&conn->gnc_tx_seq));
GNIDBG_TX(D_NET, tx, "set cookie/id/bits", NULL);
spin_unlock(&conn->gnc_tx_lock);
return 0;
}
static inline void
kgnilnd_tx_log_retrans(kgn_conn_t *conn, kgn_tx_t *tx)
{
int log_retrans;
log_retrans = ((tx->tx_retrans < 25) || ((tx->tx_retrans % 25) == 0));
/* we don't care about TX timeout - it could be that the network is slower
* or throttled. We'll keep retranmitting - so if the network is so slow
* that we fill up our mailbox, we'll keep trying to resend that msg
* until we exceed the max_retrans _or_ gnc_last_rx expires, indicating
* that he hasn't send us any traffic in return */
/* some reasonable throttling of the debug message */
if (log_retrans) {
unsigned long now = jiffies;
/* XXX Nic: Mystical TX debug here... */
/* We expect retransmissions so only log when D_NET is enabled */
GNIDBG_SMSG_CREDS(D_NET, conn);
GNIDBG_TOMSG(D_NET, &tx->tx_msg,
"NOT_DONE on conn 0x%p->%s id %x retrans %d wait %dus"
" last_msg %uus/%uus last_cq %uus/%uus",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
tx->tx_id, tx->tx_retrans,
jiffies_to_usecs(now - tx->tx_cred_wait),
jiffies_to_usecs(now - conn->gnc_last_tx),
jiffies_to_usecs(now - conn->gnc_last_rx),
jiffies_to_usecs(now - conn->gnc_last_tx_cq),
jiffies_to_usecs(now - conn->gnc_last_rx_cq));
}
}
/* caller must be holding gnd_cq_mutex and not unlock it afterwards, as we need to drop it
* to avoid bad ordering with state_lock */
static inline int
kgnilnd_sendmsg_nolock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
spinlock_t *state_lock, kgn_tx_list_state_t state)
{
kgn_conn_t *conn = tx->tx_conn;
kgn_msg_t *msg = &tx->tx_msg;
gni_return_t rrc;
unsigned long newest_last_rx, timeout;
unsigned long now;
LASSERTF((msg->gnm_type == GNILND_MSG_IMMEDIATE) ?
immediatenob <= *kgnilnd_tunables.kgn_max_immediate :
immediatenob == 0,
"msg 0x%p type %d wrong payload size %d\n",
msg, msg->gnm_type, immediatenob);
/* make sure we catch all the cases where we'd send on a dirty old mbox
* but allow case for sending CLOSE. Since this check is within the CQ
* mutex barrier and the close message is only sent through
* kgnilnd_send_conn_close the last message out the door will be the
* close message.
*/
if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) != 0 && msg->gnm_type != GNILND_MSG_CLOSE) {
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
/* Return -ETIME, we are closing the connection already so we dont want to
* have this tx hit the wire. The tx will be killed by the calling function.
* Once the EP is marked dirty the close message will be the last
* thing to hit the wire */
return -ETIME;
}
now = jiffies;
timeout = cfs_time_seconds(conn->gnc_timeout);
newest_last_rx = GNILND_LASTRX(conn);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SEND_TIMEOUT)) {
now = now + (GNILND_TIMEOUTRX(timeout) * 2);
}
if (time_after_eq(now, newest_last_rx + GNILND_TIMEOUTRX(timeout))) {
GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn,
"Cant send to %s after timeout lapse of %lu; TO %lu\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
cfs_duration_sec(now - newest_last_rx),
cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
return -ETIME;
}
GNITX_ASSERTF(tx, (conn != NULL) && (tx->tx_id.txe_idx != 0), "tx id unset!", NULL);
/* msg->gnm_srcnid is set when the message is initialized by whatever function is
* creating the message this allows the message to contain the correct LNET NID/NET needed
* instead of the one that the peer/conn uses for sending the data.
*/
msg->gnm_connstamp = conn->gnc_my_connstamp;
msg->gnm_payload_len = immediatenob;
msg->gnm_seq = atomic_read(&conn->gnc_tx_seq);
/* always init here - kgn_checksum is a /sys module tunable
* and can be flipped at any point, even between msg init and sending */
msg->gnm_cksum = 0;
if (*kgnilnd_tunables.kgn_checksum) {
/* We must set here and not in kgnilnd_init_msg,
* we could resend this msg many times
* (NOT_DONE from gni_smsg_send below) and wouldn't pass
* through init_msg again */
msg->gnm_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM1)) {
msg->gnm_cksum += 0xf00f;
}
}
GNIDBG_TOMSG(D_NET, msg, "tx 0x%p conn 0x%p->%s sending SMSG sz %u id %x/%d [%p for %u]",
tx, conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
sizeof(kgn_msg_t), tx->tx_id.txe_smsg_id,
tx->tx_id.txe_idx, immediate, immediatenob);
if (unlikely(tx->tx_state & GNILND_TX_FAIL_SMSG)) {
rrc = cfs_fail_val ? cfs_fail_val : GNI_RC_NOT_DONE;
} else {
rrc = kgnilnd_smsg_send(conn->gnc_ephandle,
msg, sizeof(*msg), immediate,
immediatenob,
tx->tx_id.txe_smsg_id);
}
switch (rrc) {
case GNI_RC_SUCCESS:
atomic_inc(&conn->gnc_tx_seq);
conn->gnc_last_tx = jiffies;
/* no locking here as LIVE isn't a list */
kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_LIVE_FMAQ, 1);
/* this needs to be checked under lock as it might be freed from a completion
* event.
*/
if (msg->gnm_type == GNILND_MSG_NOOP) {
set_mb(conn->gnc_last_noop_sent, jiffies);
}
/* serialize with seeing CQ events for completion on this, as well as
* tx_seq */
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
atomic_inc(&conn->gnc_device->gnd_short_ntx);
atomic64_add(immediatenob, &conn->gnc_device->gnd_short_txbytes);
kgnilnd_peer_alive(conn->gnc_peer);
GNIDBG_SMSG_CREDS(D_NET, conn);
return 0;
case GNI_RC_NOT_DONE:
/* Jshimek: We can get GNI_RC_NOT_DONE for 3 reasons currently
* 1: out of mbox credits
* 2: out of mbox payload credits
* 3: On Aries out of dla credits
*/
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
/* We'll handle this error inline - makes the calling logic much more
* clean */
/* If no lock, caller doesn't want us to retry */
if (state_lock == NULL) {
return -EAGAIN;
}
/* I need kgni credits to send this. Replace tx at the head of the
* fmaq and I'll get rescheduled when credits appear. Reset the tx_state
* and bump retrans counts since we are requeueing the tx.
*/
tx->tx_state = 0;
tx->tx_retrans++;
conn->gnc_tx_retrans++;
kgnilnd_tx_log_retrans(conn, tx);
/* add to head of list for the state and retries */
spin_lock(state_lock);
kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, state, 0);
spin_unlock(state_lock);
/* We only reschedule for a certain number of retries, then
* we will wait for the CQ events indicating a release of SMSG
* credits */
if (tx->tx_retrans < *kgnilnd_tunables.kgn_max_retransmits) {
kgnilnd_schedule_conn(conn);
return 0;
} else {
/* CQ event coming in signifies either TX completed or
* RX receive. Either of these *could* free up credits
* in the SMSG mbox and we should try sending again */
GNIDBG_TX(D_NET, tx, "waiting for CQID %u event to resend",
tx->tx_conn->gnc_cqid);
kgnilnd_schedule_delay_conn(conn);
/* use +ve return code to let upper layers know they
* should stop looping on sends */
return EAGAIN;
}
default:
/* handle bad retcode gracefully */
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
return -EIO;
}
}
/* kgnilnd_sendmsg has hard wait on gnd_cq_mutex */
static inline int
kgnilnd_sendmsg(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
spinlock_t *state_lock, kgn_tx_list_state_t state)
{
kgn_device_t *dev = tx->tx_conn->gnc_device;
unsigned long timestamp;
int rc;
timestamp = jiffies;
kgnilnd_gl_mutex_lock(&dev->gnd_cq_mutex);
kgnilnd_conn_mutex_lock(&tx->tx_conn->gnc_smsg_mutex);
/* delay in jiffies - we are really concerned only with things that
* result in a schedule() or really holding this off for long times .
* NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
dev->gnd_mutex_delay += (long) jiffies - timestamp;
rc = kgnilnd_sendmsg_nolock(tx, immediate, immediatenob, state_lock, state);
RETURN(rc);
}
/* returns -EAGAIN for lock miss, anything else < 0 is hard error, >=0 for success */
static inline int
kgnilnd_sendmsg_trylock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
spinlock_t *state_lock, kgn_tx_list_state_t state)
{
kgn_conn_t *conn = tx->tx_conn;
kgn_device_t *dev = conn->gnc_device;
unsigned long timestamp;
int rc;
timestamp = jiffies;
/* technically we are doing bad things with the read_lock on the peer_conn
* table, but we shouldn't be sleeping inside here - and we don't sleep/block
* for the mutex. I bet lockdep is gonna flag this one though... */
/* there are a few cases where we don't want the immediate send - like
* when we are in the scheduler thread and it'd harm the latency of
* getting messages up to LNet */
/* rmb for gnd_ready */
smp_rmb();
if (conn->gnc_device->gnd_ready == GNILND_DEV_LOOP) {
rc = 0;
atomic_inc(&conn->gnc_device->gnd_fast_block);
} else if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
/* dont hit HW during quiesce */
rc = 0;
} else if (unlikely(atomic_read(&conn->gnc_peer->gnp_dirty_eps))) {
/* dont hit HW if stale EPs and conns left to close */
rc = 0;
} else {
atomic_inc(&conn->gnc_device->gnd_fast_try);
rc = kgnilnd_trylock(&conn->gnc_device->gnd_cq_mutex,
&conn->gnc_smsg_mutex);
}
if (!rc) {
rc = -EAGAIN;
} else {
/* we got the mutex and weren't blocked */
/* delay in jiffies - we are really concerned only with things that
* result in a schedule() or really holding this off for long times .
* NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
dev->gnd_mutex_delay += (long) jiffies - timestamp;
atomic_inc(&conn->gnc_device->gnd_fast_ok);
tx->tx_qtime = jiffies;
tx->tx_state = GNILND_TX_WAITING_COMPLETION;
rc = kgnilnd_sendmsg_nolock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
/* _nolock unlocks the mutex for us */
}
RETURN(rc);
}
/* lets us know if we can push this RDMA through now */
static int
kgnilnd_auth_rdma_bytes(kgn_device_t *dev, kgn_tx_t *tx)
{
long bytes_left;
bytes_left = atomic64_sub_return(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
if (bytes_left < 0) {
atomic64_add(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
atomic_inc(&dev->gnd_rdmaq_nstalls);
smp_wmb();
CDEBUG(D_NET, "no bytes to send, turning on timer for %lu\n",
dev->gnd_rdmaq_deadline);
mod_timer(&dev->gnd_rdmaq_timer, dev->gnd_rdmaq_deadline);
/* we never del this timer - at worst it schedules us.. */
return -EAGAIN;
} else {
return 0;
}
}
/* this adds a TX to the queue pending throttling authorization before
* we allow our remote peer to launch a PUT at us */
void
kgnilnd_queue_rdma(kgn_conn_t *conn, kgn_tx_t *tx)
{
int rc;
/* we cannot go into send_mapped_tx from here as we are holding locks
* and mem registration might end up allocating memory in kgni.
* That said, we'll push this as far as we can into the queue process */
rc = kgnilnd_auth_rdma_bytes(conn->gnc_device, tx);
if (rc < 0) {
spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_RDMAQ, 0);
/* lets us know how delayed RDMA is */
tx->tx_qtime = jiffies;
spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
} else {
/* we have RDMA authorized, now it just needs a MDD and to hit the wire */
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
/* lets us know how delayed mapping is */
tx->tx_qtime = jiffies;
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
}
/* make sure we wake up sched to run this */
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
}
/* push TX through state machine */
void
kgnilnd_queue_tx(kgn_conn_t *conn, kgn_tx_t *tx)
{
int rc = 0;
int add_tail = 1;
/* set the tx_id here, we delay it until we have an actual conn
* to fiddle with
* in some cases, the tx_id is already set to provide for things
* like RDMA completion cookies, etc */
if (tx->tx_id.txe_idx == 0) {
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0) {
kgnilnd_tx_done(tx, rc);
return;
}
}
CDEBUG(D_NET, "%s to conn %p for %s\n", kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
/* Only let NOOPs to be sent while fail loc is set, otherwise kill the tx.
*/
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ONLY_NOOP) && (tx->tx_msg.gnm_type != GNILND_MSG_NOOP)) {
kgnilnd_tx_done(tx, rc);
return;
}
switch (tx->tx_msg.gnm_type) {
case GNILND_MSG_PUT_ACK:
case GNILND_MSG_GET_REQ:
case GNILND_MSG_PUT_REQ_REV:
case GNILND_MSG_GET_ACK_REV:
/* hijacking time! If this messages will authorize our peer to
* send his dirty little bytes in an RDMA, we need to get permission */
kgnilnd_queue_rdma(conn, tx);
break;
case GNILND_MSG_IMMEDIATE:
/* try to send right now, can help reduce latency */
rc = kgnilnd_sendmsg_trylock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
if (rc >= 0) {
/* it was sent, break out of switch to avoid default case of queueing */
break;
}
/* needs to queue to try again, so... */
fallthrough;
case GNILND_MSG_NOOP:
/* Just make sure this goes out first for this conn */
add_tail = 0;
fallthrough;
default:
spin_lock(&conn->gnc_list_lock);
kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_FMAQ, add_tail);
tx->tx_qtime = jiffies;
spin_unlock(&conn->gnc_list_lock);
kgnilnd_schedule_conn(conn);
}
}
void
kgnilnd_launch_tx(kgn_tx_t *tx, kgn_net_t *net, struct lnet_processid *target)
{
kgn_peer_t *peer;
kgn_peer_t *new_peer = NULL;
kgn_conn_t *conn = NULL;
int rc;
int node_state;
ENTRY;
/* If I get here, I've committed to send, so I complete the tx with
* failure on any problems */
GNITX_ASSERTF(tx, tx->tx_conn == NULL,
"tx already has connection %px", tx->tx_conn);
/* do all of the peer & conn searching in one swoop - this avoids
* nastiness when dropping locks and needing to maintain a sane state
* in the face of stack reset or something else nuking peers & conns */
/* I expect to find him, so only take a read lock */
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
peer = kgnilnd_find_peer_locked(lnet_nid_to_nid4(&target->nid));
if (peer != NULL) {
conn = kgnilnd_find_conn_locked(peer);
/* this could be NULL during quiesce */
if (conn != NULL) {
/* Connection exists; queue message on it */
kgnilnd_queue_tx(conn, tx);
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
RETURN_EXIT;
}
/* don't create a connection if the peer is marked down */
if (peer->gnp_state != GNILND_PEER_UP) {
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
rc = -ENETRESET;
GOTO(no_peer, rc);
}
}
/* creating peer or conn; I'll need a write lock... */
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
node_state = kgnilnd_get_node_state(ntohl(target->nid.nid_addr[0]));
/* NB - this will not block during normal operations -
* the only writer of this is in the startup/shutdown path. */
rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
if (!rc) {
rc = -ESHUTDOWN;
GOTO(no_peer, rc);
}
/* ignore previous peer entirely - we cycled the lock, so we
* will create new peer and at worst drop it if peer is still
* in the tables */
rc = kgnilnd_create_peer_safe(&new_peer, lnet_nid_to_nid4(&target->nid),
net, node_state);
if (rc != 0) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
GOTO(no_peer, rc);
}
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
up_read(&kgnilnd_data.kgn_net_rw_sem);
/* search for peer again now that we have the lock
* if we don't find it, add our new one to the list */
kgnilnd_add_peer_locked(lnet_nid_to_nid4(&target->nid), new_peer,
&peer);
/* don't create a connection if the peer is not up */
if (peer->gnp_state != GNILND_PEER_UP) {
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
rc = -ENETRESET;
GOTO(no_peer, rc);
}
conn = kgnilnd_find_or_create_conn_locked(peer);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DGRAM_DROP_TX)) {
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
GOTO(no_peer, rc);
}
if (conn != NULL) {
/* oh hey, found a conn now... magical */
kgnilnd_queue_tx(conn, tx);
} else {
/* no conn, must be trying to connect - so we queue for now */
tx->tx_qtime = jiffies;
kgnilnd_tx_add_state_locked(tx, peer, NULL, GNILND_TX_PEERQ, 1);
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
RETURN_EXIT;
no_peer:
kgnilnd_tx_done(tx, rc);
RETURN_EXIT;
}
int
kgnilnd_rdma(kgn_tx_t *tx, int type,
kgn_rdma_desc_t *sink, unsigned int nob, __u64 cookie)
{
kgn_conn_t *conn = tx->tx_conn;
unsigned long timestamp;
gni_post_type_t post_type;
gni_return_t rrc;
int rc = 0;
unsigned int desc_nob = nob;
void *desc_buffer = tx->tx_buffer;
gni_mem_handle_t desc_map_key = tx->tx_map_key;
LASSERTF(kgnilnd_tx_mapped(tx),
"unmapped tx %px\n", tx);
LASSERTF(conn != NULL,
"NULL conn on tx %px, naughty, naughty\n", tx);
LASSERTF(nob <= sink->gnrd_nob,
"nob %u > sink->gnrd_nob %d (%px)\n",
nob, sink->gnrd_nob, sink);
LASSERTF(nob <= tx->tx_nob,
"nob %d > tx(%px)->tx_nob %d\n",
nob, tx, tx->tx_nob);
switch (type) {
case GNILND_MSG_GET_DONE:
case GNILND_MSG_PUT_DONE:
post_type = GNI_POST_RDMA_PUT;
break;
case GNILND_MSG_GET_DONE_REV:
case GNILND_MSG_PUT_DONE_REV:
post_type = GNI_POST_RDMA_GET;
break;
default:
CERROR("invalid msg type %s (%d)\n",
kgnilnd_msgtype2str(type), type);
LBUG();
}
if (post_type == GNI_POST_RDMA_GET) {
/* Check for remote buffer / local buffer / length alignment. All must be 4 byte
* aligned. If the local buffer is not aligned correctly using the copy buffer
* will fix that issue. If length is misaligned copy buffer will also fix the issue, we end
* up transferring extra bytes into the buffer but only copy the correct nob into the original
* buffer. Remote offset correction is done through a combination of adjusting the offset,
* making sure the length and addr are aligned and copying the data into the correct location
* once the transfer has completed.
*/
if ((((__u64)((unsigned long)tx->tx_buffer)) & 3) ||
(sink->gnrd_addr & 3) ||
(nob & 3)) {
tx->tx_offset = ((__u64)((unsigned long)sink->gnrd_addr)) & 3;
if (tx->tx_offset)
atomic_inc(&kgnilnd_data.kgn_rev_offset);
if ((nob + tx->tx_offset) & 3) {
desc_nob = ((nob + tx->tx_offset) + (4 - ((nob + tx->tx_offset) & 3)));
atomic_inc(&kgnilnd_data.kgn_rev_length);
} else {
desc_nob = (nob + tx->tx_offset);
}
if (tx->tx_buffer_copy == NULL) {
/* Allocate the largest copy buffer we will need, this will prevent us from overwriting data
* and require at most we allocate a few extra bytes. */
tx->tx_buffer_copy = kgnilnd_vzalloc(desc_nob);
if (!tx->tx_buffer_copy) {
/* allocation of buffer failed nak the rdma */
kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
kgnilnd_tx_done(tx, -EFAULT);
return 0;
}
atomic_inc(&kgnilnd_data.kgn_rev_copy_buff);
rc = kgnilnd_mem_register(conn->gnc_device->gnd_handle, (__u64)tx->tx_buffer_copy, desc_nob, NULL, GNI_MEM_READWRITE, &tx->tx_buffer_copy_map_key);
if (rc != GNI_RC_SUCCESS) {
/* Registration Failed nak rdma and kill the tx. */
kgnilnd_vfree(tx->tx_buffer_copy,
desc_nob);
tx->tx_buffer_copy = NULL;
kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
kgnilnd_tx_done(tx, -EFAULT);
return 0;
}
}
desc_map_key = tx->tx_buffer_copy_map_key;
desc_buffer = tx->tx_buffer_copy;
}
}
memset(&tx->tx_rdma_desc, 0, sizeof(tx->tx_rdma_desc));
tx->tx_rdma_desc.post_id = tx->tx_id.txe_cookie;
tx->tx_rdma_desc.type = post_type;
tx->tx_rdma_desc.cq_mode = GNI_CQMODE_GLOBAL_EVENT;
tx->tx_rdma_desc.local_addr = (__u64)((unsigned long)desc_buffer);
tx->tx_rdma_desc.local_mem_hndl = desc_map_key;
tx->tx_rdma_desc.remote_addr = sink->gnrd_addr - tx->tx_offset;
tx->tx_rdma_desc.remote_mem_hndl = sink->gnrd_key;
tx->tx_rdma_desc.length = desc_nob;
tx->tx_nob_rdma = nob;
if (post_type == GNI_POST_RDMA_PUT && *kgnilnd_tunables.kgn_bte_put_dlvr_mode)
tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_put_dlvr_mode;
if (post_type == GNI_POST_RDMA_GET && *kgnilnd_tunables.kgn_bte_get_dlvr_mode)
tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_get_dlvr_mode;
/* prep final completion message */
kgnilnd_init_msg(&tx->tx_msg, type, tx->tx_msg.gnm_srcnid);
tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
/* send actual size RDMA'd in retval */
tx->tx_msg.gnm_u.completion.gncm_retval = nob;
kgnilnd_compute_rdma_cksum(tx, nob);
if (nob == 0) {
kgnilnd_queue_tx(conn, tx);
return 0;
}
/* Don't lie (CLOSE == RDMA idle) */
LASSERTF(!conn->gnc_close_sent,
"tx %px on conn %px after close sent %d\n",
tx, conn, conn->gnc_close_sent);
GNIDBG_TX(D_NET, tx, "Post RDMA type 0x%02x conn %p dlvr_mode "
"0x%x cookie:%#llx",
type, conn, tx->tx_rdma_desc.dlvr_mode, cookie);
/* set CQ dedicated for RDMA */
tx->tx_rdma_desc.src_cq_hndl = conn->gnc_device->gnd_snd_rdma_cqh;
timestamp = jiffies;
kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
/* delay in jiffies - we are really concerned only with things that
* result in a schedule() or really holding this off for long times .
* NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
rrc = kgnilnd_post_rdma(conn->gnc_ephandle, &tx->tx_rdma_desc);
if (rrc == GNI_RC_ERROR_RESOURCE) {
kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
kgnilnd_unmap_buffer(tx, 0);
if (tx->tx_buffer_copy != NULL) {
kgnilnd_vfree(tx->tx_buffer_copy, desc_nob);
tx->tx_buffer_copy = NULL;
}
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn,
GNILND_TX_MAPQ, 0);
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
return -EAGAIN;
}
spin_lock(&conn->gnc_list_lock);
kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_LIVE_RDMAQ, 1);
tx->tx_qtime = jiffies;
spin_unlock(&conn->gnc_list_lock);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
/* XXX Nic: is this a place we should handle more errors for
* robustness sake */
LASSERT(rrc == GNI_RC_SUCCESS);
return 0;
}
kgn_rx_t *
kgnilnd_alloc_rx(void)
{
kgn_rx_t *rx;
rx = kmem_cache_alloc(kgnilnd_data.kgn_rx_cache, GFP_ATOMIC);
if (rx == NULL) {
CERROR("failed to allocate rx\n");
return NULL;
}
LIBCFS_MEM_MSG(rx, sizeof(*rx), "slab-alloced");
/* no memset to zero, we'll always fill all members */
return rx;
}
/* release is to just free connection resources
* we use this for the eager path after copying */
void
kgnilnd_release_msg(kgn_conn_t *conn)
{
gni_return_t rrc;
unsigned long timestamp;
CDEBUG(D_NET, "consuming %p\n", conn);
timestamp = jiffies;
kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
/* delay in jiffies - we are really concerned only with things that
* result in a schedule() or really holding this off for long times .
* NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
rrc = kgnilnd_smsg_release(conn->gnc_ephandle);
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
LASSERTF(rrc == GNI_RC_SUCCESS, "bad rrc %d\n", rrc);
GNIDBG_SMSG_CREDS(D_NET, conn);
kgnilnd_schedule_conn(conn);
}
void
kgnilnd_consume_rx(kgn_rx_t *rx)
{
kgn_conn_t *conn = rx->grx_conn;
kgn_msg_t *rxmsg = rx->grx_msg;
/* if we are eager, free the cache alloc'd msg */
if (unlikely(rx->grx_eager)) {
LIBCFS_FREE(rxmsg, sizeof(*rxmsg) + *kgnilnd_tunables.kgn_max_immediate);
atomic_dec(&kgnilnd_data.kgn_neager_allocs);
/* release ref from eager_recv */
kgnilnd_conn_decref(conn);
} else {
GNIDBG_MSG(D_NET, rxmsg, "rx %p processed", rx);
kgnilnd_release_msg(conn);
}
LIBCFS_MEM_MSG(rx, sizeof(*rx), "slab-freed");
kmem_cache_free(kgnilnd_data.kgn_rx_cache, rx);
}
int
kgnilnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
{
struct lnet_hdr *hdr = &lntmsg->msg_hdr;
int type = lntmsg->msg_type;
struct lnet_processid *target = &lntmsg->msg_target;
int target_is_router = lntmsg->msg_target_is_router;
int routing = lntmsg->msg_routing;
unsigned int niov = lntmsg->msg_niov;
struct bio_vec *kiov = lntmsg->msg_kiov;
unsigned int offset = lntmsg->msg_offset;
unsigned int nob = lntmsg->msg_len;
unsigned int msg_vmflush = lntmsg->msg_vmflush;
kgn_net_t *net = ni->ni_data;
kgn_tx_t *tx;
int rc = 0;
/* '1' for consistency with code that checks !mpflag to restore */
unsigned int mpflag = 1;
int reverse_rdma_flag = *kgnilnd_tunables.kgn_reverse_rdma;
/* NB 'private' is different depending on what we're sending.... */
LASSERT(!in_interrupt());
CDEBUG(D_NET, "sending msg type %d with %d bytes in %d frags to %s\n",
type, nob, niov, libcfs_idstr(target));
LASSERTF(nob == 0 || niov > 0,
"lntmsg %px nob %d niov %d\n", lntmsg, nob, niov);
if (msg_vmflush)
mpflag = memalloc_noreclaim_save();
switch (type) {
default:
CERROR("lntmsg %p with unexpected type %d\n",
lntmsg, type);
LBUG();
case LNET_MSG_ACK:
LASSERTF(nob == 0, "lntmsg %px nob %d\n",
lntmsg, nob);
break;
case LNET_MSG_GET:
LASSERT(niov == 0);
LASSERT(nob == 0);
if (routing || target_is_router)
break; /* send IMMEDIATE */
/* it is safe to do direct GET with out mapping buffer for RDMA as we
* check the eventual sink buffer here - if small enough, remote
* end is perfectly capable of returning data in short message -
* The magic is that we call lnet_parse in kgnilnd_recv with rdma_req=0
* for IMMEDIATE messages which will have it send a real reply instead
* of doing kgnilnd_recv to have the RDMA continued */
if (lntmsg->msg_md->md_length <= *kgnilnd_tunables.kgn_max_immediate)
break;
if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ,
lnet_nid_to_nid4(&ni->ni_nid));
else
tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ_REV,
lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL) {
rc = -ENOMEM;
goto out;
}
rc = kgnilnd_setup_rdma_buffer(tx, lntmsg->msg_md->md_niov,
lntmsg->msg_md->md_kiov,
0, lntmsg->msg_md->md_length);
if (rc != 0) {
CERROR("unable to setup buffer: %d\n", rc);
kgnilnd_tx_done(tx, rc);
rc = -EIO;
goto out;
}
tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
if (tx->tx_lntmsg[1] == NULL) {
CERROR("Can't create reply for GET to %s\n",
libcfs_nidstr(&target->nid));
kgnilnd_tx_done(tx, rc);
rc = -EIO;
goto out;
}
tx->tx_lntmsg[0] = lntmsg;
if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
lnet_hdr_to_nid4(hdr, &tx->tx_msg.gnm_u.get.gngm_hdr);
else
lnet_hdr_to_nid4(hdr,
&tx->tx_msg.gnm_u.putreq.gnprm_hdr);
/* rest of tx_msg is setup just before it is sent */
kgnilnd_launch_tx(tx, net, target);
goto out;
case LNET_MSG_REPLY:
case LNET_MSG_PUT:
/* to save on MDDs, we'll handle short kiov by vmap'ing
* and sending via SMSG */
if (nob <= *kgnilnd_tunables.kgn_max_immediate)
break;
if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ,
lnet_nid_to_nid4(&ni->ni_nid));
else
tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ_REV,
lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL) {
rc = -ENOMEM;
goto out;
}
rc = kgnilnd_setup_rdma_buffer(tx, niov,
kiov, offset, nob);
if (rc != 0) {
kgnilnd_tx_done(tx, rc);
rc = -EIO;
goto out;
}
tx->tx_lntmsg[0] = lntmsg;
if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
lnet_hdr_to_nid4(hdr,
&tx->tx_msg.gnm_u.putreq.gnprm_hdr);
else
lnet_hdr_to_nid4(hdr, &tx->tx_msg.gnm_u.get.gngm_hdr);
/* rest of tx_msg is setup just before it is sent */
kgnilnd_launch_tx(tx, net, target);
goto out;
}
/* send IMMEDIATE */
LASSERTF(nob <= *kgnilnd_tunables.kgn_max_immediate,
"lntmsg 0x%p too large %d\n", lntmsg, nob);
tx = kgnilnd_new_tx_msg(GNILND_MSG_IMMEDIATE,
lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL) {
rc = -ENOMEM;
goto out;
}
rc = kgnilnd_setup_immediate_buffer(tx, niov, kiov, offset, nob);
if (rc != 0) {
kgnilnd_tx_done(tx, rc);
goto out;
}
lnet_hdr_to_nid4(hdr, &tx->tx_msg.gnm_u.immediate.gnim_hdr);
tx->tx_lntmsg[0] = lntmsg;
kgnilnd_launch_tx(tx, net, target);
out:
/* use stored value as we could have already finalized lntmsg here from a failed launch */
if (msg_vmflush)
memalloc_noreclaim_restore(mpflag);
return rc;
}
void
kgnilnd_setup_rdma(struct lnet_ni *ni, kgn_rx_t *rx, struct lnet_msg *lntmsg, int mlen)
{
kgn_conn_t *conn = rx->grx_conn;
kgn_msg_t *rxmsg = rx->grx_msg;
unsigned int niov = lntmsg->msg_niov;
struct bio_vec *kiov = lntmsg->msg_kiov;
unsigned int offset = lntmsg->msg_offset;
unsigned int nob = lntmsg->msg_len;
int done_type;
kgn_tx_t *tx;
int rc = 0;
switch (rxmsg->gnm_type) {
case GNILND_MSG_PUT_REQ_REV:
done_type = GNILND_MSG_PUT_DONE_REV;
nob = mlen;
break;
case GNILND_MSG_GET_REQ:
done_type = GNILND_MSG_GET_DONE;
break;
default:
CERROR("invalid msg type %s (%d)\n",
kgnilnd_msgtype2str(rxmsg->gnm_type),
rxmsg->gnm_type);
LBUG();
}
tx = kgnilnd_new_tx_msg(done_type, lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL)
goto failed_0;
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0)
goto failed_1;
rc = kgnilnd_setup_rdma_buffer(tx, niov, kiov, offset, nob);
if (rc != 0)
goto failed_1;
tx->tx_lntmsg[0] = lntmsg;
tx->tx_getinfo = rxmsg->gnm_u.get;
/* we only queue from kgnilnd_recv - we might get called from other contexts
* and we don't want to block the mutex in those cases */
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
return;
failed_1:
kgnilnd_tx_done(tx, rc);
kgnilnd_nak_rdma(conn, done_type, rc, rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
failed_0:
lnet_finalize(lntmsg, rc);
}
int
kgnilnd_eager_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
void **new_private)
{
kgn_rx_t *rx = private;
kgn_conn_t *conn = rx->grx_conn;
kgn_msg_t *rxmsg = rx->grx_msg;
kgn_msg_t *eagermsg = NULL;
kgn_peer_t *peer = NULL;
kgn_conn_t *found_conn = NULL;
GNIDBG_MSG(D_NET, rxmsg, "eager recv for conn %p, rxmsg %p, lntmsg %p",
conn, rxmsg, lntmsg);
if (rxmsg->gnm_payload_len > *kgnilnd_tunables.kgn_max_immediate) {
GNIDBG_MSG(D_ERROR, rxmsg, "payload too large %d",
rxmsg->gnm_payload_len);
return -EPROTO;
}
/* Grab a read lock so the connection doesnt disappear on us
* while we look it up
*/
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
peer = kgnilnd_find_peer_locked(rxmsg->gnm_srcnid);
if (peer != NULL)
found_conn = kgnilnd_find_conn_locked(peer);
/* Verify the connection found is the same one that the message
* is supposed to be using, if it is not output an error message
* and return.
*/
if (!peer || !found_conn
|| found_conn->gnc_peer_connstamp != rxmsg->gnm_connstamp) {
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
CERROR("Couldnt find matching peer %p or conn %p / %p\n",
peer, conn, found_conn);
if (found_conn) {
CERROR("Unexpected connstamp %#llx(%#llx expected) from %s\n",
rxmsg->gnm_connstamp,
found_conn->gnc_peer_connstamp,
libcfs_nid2str(peer->gnp_nid));
}
return -ENOTCONN;
}
/* add conn ref to ensure it doesn't go away until all eager
* messages processed */
kgnilnd_conn_addref(conn);
/* Now that we have verified the connection is valid and added a
* reference we can remove the read_lock on the peer_conn_lock */
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* we have no credits or buffers for this message, so copy it
* somewhere for a later kgnilnd_recv */
if (atomic_read(&kgnilnd_data.kgn_neager_allocs) >=
*kgnilnd_tunables.kgn_eager_credits) {
CERROR("Out of eager credits to %s\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid));
return -ENOMEM;
}
atomic_inc(&kgnilnd_data.kgn_neager_allocs);
LIBCFS_ALLOC(eagermsg, sizeof(*eagermsg) + *kgnilnd_tunables.kgn_max_immediate);
if (eagermsg == NULL) {
kgnilnd_conn_decref(conn);
CERROR("couldn't allocate eager rx message for conn %p to %s\n",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
return -ENOMEM;
}
/* copy msg and payload */
memcpy(eagermsg, rxmsg, sizeof(*rxmsg) + rxmsg->gnm_payload_len);
rx->grx_msg = eagermsg;
rx->grx_eager = 1;
/* stash this for lnet_finalize on cancel-on-conn-close */
rx->grx_lntmsg = lntmsg;
/* keep the same rx_t, it just has a new grx_msg now */
*new_private = private;
/* release SMSG buffer */
kgnilnd_release_msg(conn);
return 0;
}
int
kgnilnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
int delayed, struct iov_iter *to, unsigned int rlen)
{
kgn_rx_t *rx = private;
kgn_conn_t *conn = rx->grx_conn;
kgn_msg_t *rxmsg = rx->grx_msg;
int wanted = iov_iter_count(to);
kgn_tx_t *tx;
int rc = 0;
u32 pload_cksum;
ENTRY;
LASSERT(!in_interrupt());
LASSERTF(wanted <= rlen, "%d <= %d\n", wanted, rlen);
GNIDBG_MSG(D_NET, rxmsg,
"conn %px, rxmsg %px, lntmsg %px iov=%px iov len=%d rlen=%d",
conn, rxmsg, lntmsg, to, wanted, rlen);
/* we need to lock here as recv can be called from any context */
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
if (rx->grx_eager && conn->gnc_state != GNILND_CONN_ESTABLISHED) {
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* someone closed the conn after we copied this out, nuke it */
kgnilnd_consume_rx(rx);
lnet_finalize(lntmsg, conn->gnc_error);
RETURN(0);
}
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
switch (rxmsg->gnm_type) {
default:
GNIDBG_MSG(D_NETERROR, rxmsg,
"conn %px, rx %px, rxmsg %px, lntmsg %px iov %px iov len=%d rlen=%d",
conn, rx, rxmsg, lntmsg, to, wanted, rlen);
LBUG();
case GNILND_MSG_IMMEDIATE:
if (wanted > rxmsg->gnm_payload_len) {
GNIDBG_MSG(D_ERROR, rxmsg,
"Immediate message from %s too big: %d > %d",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
wanted, rxmsg->gnm_payload_len);
rc = -EINVAL;
kgnilnd_consume_rx(rx);
RETURN(rc);
}
/* rxmsg[1] is a pointer to the payload, sitting in the buffer
* right after the kgn_msg_t header - so just 'cute' way of saying
* rxmsg + sizeof(kgn_msg_t) */
/* check payload checksum if sent */
if (*kgnilnd_tunables.kgn_checksum >= 2 &&
!rxmsg->gnm_payload_cksum &&
rxmsg->gnm_payload_len != 0)
GNIDBG_MSG(D_WARNING, rxmsg, "no msg payload checksum when enabled");
if (rxmsg->gnm_payload_cksum != 0) {
/* gnm_payload_len set in kgnilnd_sendmsg from tx->tx_nob,
* which is what is used to calculate the cksum on the TX side */
pload_cksum = kgnilnd_cksum(&rxmsg[1], rxmsg->gnm_payload_len);
if (rxmsg->gnm_payload_cksum != pload_cksum) {
GNIDBG_MSG(D_NETERROR, rxmsg,
"Bad payload checksum (%x expected %x)",
pload_cksum, rxmsg->gnm_payload_cksum);
switch (*kgnilnd_tunables.kgn_checksum_dump) {
case 2:
kgnilnd_dump_blob(D_BUFFS, "bad payload checksum",
&rxmsg[1], rxmsg->gnm_payload_len);
fallthrough;
case 1:
libcfs_debug_dumplog();
break;
default:
break;
}
rc = -ENOKEY;
/* checksum problems are fatal, kill the conn */
kgnilnd_consume_rx(rx);
kgnilnd_close_conn(conn, rc);
RETURN(rc);
}
}
rc = copy_to_iter(&rxmsg[1], wanted, to);
if (rc != wanted) {
rc = -EFAULT;
break;
}
kgnilnd_consume_rx(rx);
lnet_finalize(lntmsg, 0);
RETURN(0);
case GNILND_MSG_PUT_REQ:
/* LNET wants to truncate or drop transaction, sending NAK */
if (wanted == 0) {
kgnilnd_consume_rx(rx);
lnet_finalize(lntmsg, 0);
/* only error if lntmsg == NULL, otherwise we are just
* short circuiting the rdma process of 0 bytes */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
lntmsg == NULL ? -ENOENT : 0,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
RETURN(0);
}
/* sending ACK with sink buff. info */
tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_ACK,
lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL) {
kgnilnd_consume_rx(rx);
RETURN(-ENOMEM);
}
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0) {
GOTO(nak_put_req, rc);
}
rc = kgnilnd_setup_rdma_buffer(tx, to->nr_segs,
(struct bio_vec *)to->bvec,
to->iov_offset,
wanted);
if (rc != 0) {
GOTO(nak_put_req, rc);
}
tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
rxmsg->gnm_u.putreq.gnprm_cookie;
tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
(__u64)((unsigned long)tx->tx_buffer);
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = wanted;
tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
tx->tx_qtime = jiffies;
/* we only queue from kgnilnd_recv - we might get called from other contexts
* and we don't want to block the mutex in those cases */
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
kgnilnd_consume_rx(rx);
RETURN(0);
nak_put_req:
/* make sure we send an error back when the PUT fails */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
kgnilnd_tx_done(tx, rc);
kgnilnd_consume_rx(rx);
/* return magic LNet network error */
RETURN(-EIO);
case GNILND_MSG_GET_REQ_REV:
/* LNET wants to truncate or drop transaction, sending NAK */
if (wanted == 0) {
kgnilnd_consume_rx(rx);
lnet_finalize(lntmsg, 0);
/* only error if lntmsg == NULL, otherwise we are just
* short circuiting the rdma process of 0 bytes */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
lntmsg == NULL ? -ENOENT : 0,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
RETURN(0);
}
/* lntmsg can be null when parsing a LNET_GET */
if (lntmsg != NULL) {
/* sending ACK with sink buff. info */
tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_ACK_REV,
lnet_nid_to_nid4(&ni->ni_nid));
if (tx == NULL) {
kgnilnd_consume_rx(rx);
RETURN(-ENOMEM);
}
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0)
GOTO(nak_get_req_rev, rc);
rc = kgnilnd_setup_rdma_buffer(tx, to->nr_segs,
(struct bio_vec *)to->bvec,
to->iov_offset,
wanted);
if (rc != 0)
GOTO(nak_get_req_rev, rc);
tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
rxmsg->gnm_u.putreq.gnprm_cookie;
tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
(__u64)((unsigned long)tx->tx_buffer);
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = wanted;
tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
/* we only queue from kgnilnd_recv - we might get called from other contexts
* and we don't want to block the mutex in those cases */
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
} else {
/* No match */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
-ENOENT,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
}
kgnilnd_consume_rx(rx);
RETURN(0);
nak_get_req_rev:
/* make sure we send an error back when the GET fails */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
kgnilnd_tx_done(tx, rc);
kgnilnd_consume_rx(rx);
/* return magic LNet network error */
RETURN(-EIO);
case GNILND_MSG_PUT_REQ_REV:
/* LNET wants to truncate or drop transaction, sending NAK */
if (wanted == 0) {
kgnilnd_consume_rx(rx);
lnet_finalize(lntmsg, 0);
/* only error if lntmsg == NULL, otherwise we are just
* short circuiting the rdma process of 0 bytes */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
lntmsg == NULL ? -ENOENT : 0,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
RETURN(0);
}
if (lntmsg != NULL) {
/* Matched! */
kgnilnd_setup_rdma(ni, rx, lntmsg, wanted);
} else {
/* No match */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
-ENOENT,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
}
kgnilnd_consume_rx(rx);
RETURN(0);
case GNILND_MSG_GET_REQ:
if (lntmsg != NULL) {
/* Matched! */
kgnilnd_setup_rdma(ni, rx, lntmsg, wanted);
} else {
/* No match */
kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
-ENOENT,
rxmsg->gnm_u.get.gngm_cookie,
lnet_nid_to_nid4(&ni->ni_nid));
}
kgnilnd_consume_rx(rx);
RETURN(0);
}
RETURN(0);
}
/* needs write_lock on kgn_peer_conn_lock held */
int
kgnilnd_check_conn_timeouts_locked(kgn_conn_t *conn)
{
unsigned long timeout, keepalive;
unsigned long now = jiffies;
unsigned long newest_last_rx;
kgn_tx_t *tx;
/* given that we found this conn hanging off a peer, it better damned
* well be connected */
LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
"conn 0x%p->%s with bad state%s\n", conn,
conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
: "<?>",
kgnilnd_conn_state2str(conn));
CDEBUG(D_NET, "checking conn %p->%s timeout %d keepalive %d "
"rx_diff %lu tx_diff %lu\n",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
conn->gnc_timeout, GNILND_TO2KA(conn->gnc_timeout),
cfs_duration_sec(now - conn->gnc_last_rx_cq),
cfs_duration_sec(now - conn->gnc_last_tx));
timeout = cfs_time_seconds(conn->gnc_timeout);
keepalive = cfs_time_seconds(GNILND_TO2KA(conn->gnc_timeout));
/* just in case our lack of RX msg processing is gumming up the works - give the
* remove an extra chance */
newest_last_rx = GNILND_LASTRX(conn);
if (time_after_eq(now, newest_last_rx + timeout)) {
uint32_t level = D_CONSOLE|D_NETERROR;
if (conn->gnc_peer->gnp_state == GNILND_PEER_DOWN) {
level = D_NET;
}
GNIDBG_CONN(level, conn,
"No gnilnd traffic received from %s for %lu "
"seconds, terminating connection. Is node down? ",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
cfs_duration_sec(now - newest_last_rx));
return -ETIMEDOUT;
}
/* we don't timeout on last_tx stalls - we are going to trust the
* underlying network to let us know when sends are failing.
* At worst, the peer will timeout our RX stamp and drop the connection
* at that point. We'll then see his CLOSE or at worst his RX
* stamp stop and drop the connection on our end */
if (time_after_eq(now, conn->gnc_last_tx + keepalive)) {
CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%lu)) "
"last %lu/%lu/%lu %lus/%lus/%lus\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
cfs_duration_sec(jiffies - conn->gnc_last_tx),
keepalive,
conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
conn->gnc_last_noop_cq,
cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
set_mb(conn->gnc_last_noop_want, jiffies);
atomic_inc(&conn->gnc_reaper_noop);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
return 0;
tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP,
lnet_nid_to_nid4(&conn->gnc_peer->gnp_net->gnn_ni->ni_nid));
if (tx == NULL)
return 0;
kgnilnd_queue_tx(conn, tx);
}
return 0;
}
/* needs write_lock on kgn_peer_conn_lock held */
void
kgnilnd_check_peer_timeouts_locked(kgn_peer_t *peer, struct list_head *todie,
struct list_head *souls)
{
unsigned long timeout;
kgn_conn_t *conn, *connN = NULL;
kgn_tx_t *tx, *txN;
int rc = 0;
int count = 0;
int reconnect;
int to_reconn;
short releaseconn = 0;
unsigned long first_rx = 0;
int purgatory_conn_cnt = 0;
CDEBUG(D_NET, "checking peer 0x%p->%s for timeouts; interval %lus\n",
peer, libcfs_nid2str(peer->gnp_nid),
peer->gnp_reconnect_interval);
timeout = cfs_time_seconds(max(*kgnilnd_tunables.kgn_timeout,
GNILND_MIN_TIMEOUT));
conn = kgnilnd_find_conn_locked(peer);
if (conn) {
/* if there is a valid conn, check the queues for timeouts */
rc = kgnilnd_check_conn_timeouts_locked(conn);
if (rc) {
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSING)) {
/* simulate a RX CLOSE after the timeout but before
* the scheduler thread gets it */
conn->gnc_close_recvd = GNILND_CLOSE_INJECT1;
conn->gnc_peer_error = -ETIMEDOUT;
}
if (*kgnilnd_tunables.kgn_to_reconn_disable &&
rc == -ETIMEDOUT) {
peer->gnp_state = GNILND_PEER_TIMED_OUT;
CDEBUG(D_WARNING, "%s conn timed out, will "
"reconnect upon request from peer\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid));
}
/* Once we mark closed, any of the scheduler threads could
* get it and move through before we hit the fail loc code */
kgnilnd_close_conn_locked(conn, rc);
} else {
/* first_rx is used to decide when to release a conn from purgatory.
*/
first_rx = conn->gnc_first_rx;
}
}
/* now regardless of starting new conn, find tx on peer queue that
* are old and smell bad - do this first so we don't trigger
* reconnect on empty queue if we timeout all */
list_for_each_entry_safe(tx, txN, &peer->gnp_tx_queue, tx_list) {
if (time_after_eq(jiffies, tx->tx_qtime + timeout)) {
if (count == 0) {
LCONSOLE_INFO("could not send to %s due to connection"
" setup failure after %lu seconds\n",
libcfs_nid2str(peer->gnp_nid),
cfs_duration_sec(jiffies - tx->tx_qtime));
}
kgnilnd_tx_del_state_locked(tx, peer, NULL,
GNILND_TX_ALLOCD);
list_add_tail(&tx->tx_list, todie);
count++;
}
}
if (count || peer->gnp_connecting == GNILND_PEER_KILL) {
CDEBUG(D_NET, "canceling %d tx for peer 0x%p->%s\n",
count, peer, libcfs_nid2str(peer->gnp_nid));
/* if we nuked all the TX, stop peer connection attempt (if there is one..) */
if (list_empty(&peer->gnp_tx_queue) ||
peer->gnp_connecting == GNILND_PEER_KILL) {
/* we pass down todie to use a common function - but we know there are
* no TX to add */
kgnilnd_cancel_peer_connect_locked(peer, todie);
}
}
/* Don't reconnect if we are still trying to clear out old conns.
* This prevents us sending traffic on the new mbox before ensuring we are done
* with the old one */
reconnect = (peer->gnp_state == GNILND_PEER_UP) &&
(atomic_read(&peer->gnp_dirty_eps) == 0);
/* fast reconnect after a timeout */
to_reconn = !conn &&
(peer->gnp_last_errno == -ETIMEDOUT) &&
*kgnilnd_tunables.kgn_fast_reconn;
/* if we are not connected and there are tx on the gnp_tx_queue waiting
* to be sent, we'll check the reconnect interval and fire up a new
* connection request */
if (reconnect &&
(peer->gnp_connecting == GNILND_PEER_IDLE) &&
(time_after_eq(jiffies, peer->gnp_reconnect_time)) &&
(!list_empty(&peer->gnp_tx_queue) || to_reconn)) {
CDEBUG(D_NET, "starting connect to %s\n",
libcfs_nid2str(peer->gnp_nid));
LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE,
"Peer was idle and we have a write_lock, state issue %d\n",
peer->gnp_connecting);
peer->gnp_connecting = GNILND_PEER_CONNECT;
kgnilnd_peer_addref(peer); /* extra ref for connd */
spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
list_add_tail(&peer->gnp_connd_list,
&peer->gnp_net->gnn_dev->gnd_connd_peers);
spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
kgnilnd_schedule_dgram(peer->gnp_net->gnn_dev);
}
/* fail_loc to allow us to delay release of purgatory */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PURG_REL_DELAY))
return;
/* This check allows us to verify that the new conn is actually being used. This allows us to
* pull the old conns out of purgatory if they have actually seen traffic.
* We only release a conn from purgatory during stack reset, admin command, or when a peer reconnects
*/
if (first_rx &&
time_after(jiffies, first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout))) {
CDEBUG(D_INFO, "We can release peer %s conn's from purgatory %lu\n",
libcfs_nid2str(peer->gnp_nid), first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout));
releaseconn = 1;
}
list_for_each_entry_safe (conn, connN, &peer->gnp_conns, gnc_list) {
/* check for purgatory timeouts */
if (conn->gnc_in_purgatory) {
/* We cannot detach this conn from purgatory if it has not been closed so we reschedule it
* that way the next time we check it we can detach it from purgatory
*/
if (conn->gnc_state != GNILND_CONN_DONE) {
/* Skip over conns that are currently not DONE. If they arent already scheduled
* for completion something in the state machine is broken.
*/
continue;
}
/* We only detach a conn that is in purgatory if we have received a close message,
* we have a new valid connection that has successfully received data, or an admin
* command tells us we need to detach.
*/
if (conn->gnc_close_recvd || releaseconn || conn->gnc_needs_detach) {
unsigned long waiting;
waiting = (long) jiffies - conn->gnc_last_rx_cq;
/* C.E: The remote peer is expected to close the
* connection (see kgnilnd_check_conn_timeouts)
* via the reaper thread and nuke out the MDD and
* FMA resources after conn->gnc_timeout has expired
* without an FMA RX */
CDEBUG(D_NET, "Reconnected to %s in %lds or admin forced detach, dropping "
" held resources\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
cfs_duration_sec(waiting));
kgnilnd_detach_purgatory_locked(conn, souls);
} else {
purgatory_conn_cnt++;
}
}
}
/* If we have too many connections in purgatory we could run out of
* resources. Limit the number of connections to a tunable number,
* clean up to the minimum all in one fell swoop... there are
* situations where dvs will retry tx's and we can eat up several
* hundread connection requests at once.
*/
if (purgatory_conn_cnt > *kgnilnd_tunables.kgn_max_purgatory) {
list_for_each_entry_safe(conn, connN, &peer->gnp_conns,
gnc_list) {
if (conn->gnc_in_purgatory &&
conn->gnc_state == GNILND_CONN_DONE) {
CDEBUG(D_NET, "Dropping Held resource due to"
" resource limits being hit\n");
kgnilnd_detach_purgatory_locked(conn, souls);
if (purgatory_conn_cnt-- <
*kgnilnd_tunables.kgn_max_purgatory)
break;
}
}
}
}
void
kgnilnd_reaper_check(int idx)
{
struct list_head *peers = &kgnilnd_data.kgn_peers[idx];
struct list_head *ctmp, *ctmpN;
LIST_HEAD(geriatrics);
LIST_HEAD(souls);
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
list_for_each_safe(ctmp, ctmpN, peers) {
kgn_peer_t *peer = NULL;
/* don't timeout stuff if the network is mucked or shutting down */
if (kgnilnd_check_hw_quiesce()) {
break;
}
peer = list_entry(ctmp, kgn_peer_t, gnp_list);
kgnilnd_check_peer_timeouts_locked(peer, &geriatrics, &souls);
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
kgnilnd_txlist_done(&geriatrics, -EHOSTUNREACH);
kgnilnd_release_purgatory_list(&souls);
}
void
kgnilnd_update_reaper_timeout(long timeout)
{
LASSERT(timeout > 0);
spin_lock(&kgnilnd_data.kgn_reaper_lock);
if (timeout < kgnilnd_data.kgn_new_min_timeout)
kgnilnd_data.kgn_new_min_timeout = timeout;
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
}
static void
kgnilnd_reaper_poke_with_stick(cfs_timer_cb_arg_t arg)
{
wake_up(&kgnilnd_data.kgn_reaper_waitq);
}
int
kgnilnd_reaper(void *arg)
{
long timeout;
int i;
int hash_index = 0;
unsigned long next_check_time = jiffies;
long current_min_timeout = MAX_SCHEDULE_TIMEOUT;
struct timer_list timer;
DEFINE_WAIT(wait);
/* all gnilnd threads need to run fairly urgently */
set_user_nice(current, *kgnilnd_tunables.kgn_nice);
spin_lock(&kgnilnd_data.kgn_reaper_lock);
while (!kgnilnd_data.kgn_shutdown) {
/* I wake up every 'p' seconds to check for timeouts on some
* more peers. I try to check every connection 'n' times
* within the global minimum of all keepalive and timeout
* intervals, to ensure I attend to every connection within
* (n+1)/n times its timeout intervals. */
const int p = GNILND_REAPER_THREAD_WAKE;
const int n = GNILND_REAPER_NCHECKS;
int chunk;
/* to quiesce or to not quiesce, that is the question */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
KGNILND_SPIN_QUIESCE;
spin_lock(&kgnilnd_data.kgn_reaper_lock);
}
/* careful with the jiffy wrap... */
timeout = (long)(next_check_time - jiffies);
if (timeout > 0) {
prepare_to_wait(&kgnilnd_data.kgn_reaper_waitq, &wait,
TASK_INTERRUPTIBLE);
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
cfs_timer_setup(&timer, kgnilnd_reaper_poke_with_stick,
next_check_time, 0);
mod_timer(&timer, (long) jiffies + timeout);
/* check flag variables before committing */
if (!kgnilnd_data.kgn_shutdown &&
!kgnilnd_data.kgn_quiesce_trigger) {
CDEBUG(D_INFO, "schedule timeout %ld (%lu sec)\n",
timeout, cfs_duration_sec(timeout));
schedule();
CDEBUG(D_INFO, "awake after schedule\n");
}
timer_delete_sync(&timer);
spin_lock(&kgnilnd_data.kgn_reaper_lock);
finish_wait(&kgnilnd_data.kgn_reaper_waitq, &wait);
continue;
}
/* new_min_timeout is set from the conn timeouts and keepalive
* this should end up with a min timeout of
* GNILND_TIMEOUT2KEEPALIVE(t) or roughly LND_TIMEOUT/2 */
if (kgnilnd_data.kgn_new_min_timeout < current_min_timeout) {
current_min_timeout = kgnilnd_data.kgn_new_min_timeout;
CDEBUG(D_NET, "Set new min timeout %ld\n",
current_min_timeout);
}
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
/* Compute how many table entries to check now so I get round
* the whole table fast enough given that I do this at fixed
* intervals of 'p' seconds) */
chunk = *kgnilnd_tunables.kgn_peer_hash_size;
if (kgnilnd_data.kgn_new_min_timeout > n * p)
chunk = (chunk * n * p) /
kgnilnd_data.kgn_new_min_timeout;
if (chunk == 0)
chunk = 1;
for (i = 0; i < chunk; i++) {
kgnilnd_reaper_check(hash_index);
hash_index = (hash_index + 1) %
*kgnilnd_tunables.kgn_peer_hash_size;
}
next_check_time = (long) jiffies + cfs_time_seconds(p);
CDEBUG(D_INFO, "next check at %lu or in %d sec\n", next_check_time, p);
spin_lock(&kgnilnd_data.kgn_reaper_lock);
}
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
kgnilnd_thread_fini();
return 0;
}
static int kgnilnd_recv_bte_get(kgn_tx_t *tx)
{
unsigned niov, offset, nob;
struct bio_vec *kiov;
struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
int rc = 0;
kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, tx->tx_nob_rdma);
if (kiov != NULL) {
struct iov_iter to;
iov_iter_bvec(&to, READ, kiov, niov, offset + nob);
iov_iter_advance(&to, offset);
rc = copy_to_iter(tx->tx_buffer_copy + tx->tx_offset, nob, &to);
if (rc != nob)
rc = -EFAULT;
} else {
memcpy(tx->tx_buffer, tx->tx_buffer_copy + tx->tx_offset, nob);
}
return rc;
}
int
kgnilnd_check_rdma_cq(kgn_device_t *dev)
{
gni_return_t rrc;
gni_post_descriptor_t *desc;
__u64 event_data;
kgn_tx_ev_id_t ev_id;
char err_str[256];
int should_retry, rc;
long num_processed = 0;
kgn_conn_t *conn = NULL;
kgn_tx_t *tx = NULL;
kgn_rdma_desc_t *rdesc;
unsigned int rnob;
__u64 rcookie;
for (;;) {
/* make sure we don't keep looping if we need to reset */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
return num_processed;
}
rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
if (!rc) {
/* we didn't get the mutex, so return that there is still work
* to be done */
return 1;
}
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMA)) {
/* a bit gross - but we need a good way to test for
* delayed RDMA completions and the easiest way to do
* that is to delay the RDMA CQ events */
rrc = GNI_RC_NOT_DONE;
} else {
rrc = kgnilnd_cq_get_event(dev->gnd_snd_rdma_cqh, &event_data);
}
if (rrc == GNI_RC_NOT_DONE) {
kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
CDEBUG(D_INFO, "SEND RDMA CQ %d empty processed %ld\n",
dev->gnd_id, num_processed);
return num_processed;
}
dev->gnd_sched_alive = jiffies;
num_processed++;
LASSERTF(!GNI_CQ_OVERRUN(event_data),
"this is bad, somehow our credits didn't protect us"
" from CQ overrun\n");
LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_POST,
"rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
event_data, GNI_CQ_GET_TYPE(event_data));
rrc = kgnilnd_get_completed(dev->gnd_snd_rdma_cqh, event_data,
&desc);
kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
/* XXX Nic: Need better error handling here... */
LASSERTF((rrc == GNI_RC_SUCCESS) ||
(rrc == GNI_RC_TRANSACTION_ERROR),
"rrc %d\n", rrc);
ev_id.txe_cookie = desc->post_id;
kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
if (conn == NULL || tx == NULL) {
/* either conn or tx was already nuked and this is a "late"
* completion, so drop it */
continue;
}
GNITX_ASSERTF(tx, tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE ||
tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV,
"tx %px with type %d\n", tx, tx->tx_msg.gnm_type);
GNIDBG_TX(D_NET, tx, "RDMA completion for %d bytes", tx->tx_nob);
if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
lnet_set_reply_msg_len(NULL, tx->tx_lntmsg[1],
tx->tx_msg.gnm_u.completion.gncm_retval);
}
rc = 0;
if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV && desc->status == GNI_RC_SUCCESS) {
u16 cksum = tx->tx_putinfo.gnpam_payload_cksum;
if (tx->tx_buffer_copy != NULL)
rc = kgnilnd_recv_bte_get(tx);
if (rc == 0)
rc = kgnilnd_verify_rdma_cksum(tx, cksum, tx->tx_nob_rdma);
}
if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV && desc->status == GNI_RC_SUCCESS) {
u16 cksum = tx->tx_getinfo.gngm_payload_cksum;
if (tx->tx_buffer_copy != NULL)
rc = kgnilnd_recv_bte_get(tx);
if (rc == 0)
rc = kgnilnd_verify_rdma_cksum(tx, cksum, tx->tx_nob_rdma);
}
/* remove from rdmaq */
kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
spin_lock(&conn->gnc_list_lock);
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
spin_unlock(&conn->gnc_list_lock);
kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
event_data = 1LL << 48;
rc = 1;
}
if (likely(desc->status == GNI_RC_SUCCESS) && rc == 0) {
atomic_inc(&dev->gnd_rdma_ntx);
atomic64_add(tx->tx_nob, &dev->gnd_rdma_txbytes);
/* transaction succeeded, add into fmaq */
kgnilnd_queue_tx(conn, tx);
kgnilnd_peer_alive(conn->gnc_peer);
/* drop ref from kgnilnd_validate_tx_ev_id */
kgnilnd_admin_decref(conn->gnc_tx_in_use);
kgnilnd_conn_decref(conn);
continue;
}
/* fall through to the TRANSACTION_ERROR case */
tx->tx_retrans++;
/* get stringified version for log messages */
kgnilnd_cq_error_str(event_data, &err_str, 256);
kgnilnd_cq_error_recoverable(event_data, &should_retry);
/* make sure we are not off in the weeds with this tx */
if (tx->tx_retrans >
*kgnilnd_tunables.kgn_max_retransmits) {
GNIDBG_TX(D_NETERROR, tx,
"giving up on TX, too many retries", NULL);
should_retry = 0;
}
GNIDBG_TX(D_NETERROR, tx, "RDMA %s error (%s)",
should_retry ? "transient" : "unrecoverable", err_str);
if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
rdesc = &tx->tx_putinfo.gnpam_desc;
rnob = tx->tx_putinfo.gnpam_desc.gnrd_nob;
rcookie = tx->tx_putinfo.gnpam_dst_cookie;
} else {
rdesc = &tx->tx_getinfo.gngm_desc;
rnob = tx->tx_lntmsg[0]->msg_len;
rcookie = tx->tx_getinfo.gngm_cookie;
}
if (should_retry) {
kgnilnd_rdma(tx,
tx->tx_msg.gnm_type,
rdesc,
rnob, rcookie);
} else {
kgnilnd_nak_rdma(conn,
tx->tx_msg.gnm_type,
-EFAULT,
rcookie,
tx->tx_msg.gnm_srcnid);
kgnilnd_tx_done(tx, -GNILND_NOPURG);
kgnilnd_close_conn(conn, -ECOMM);
}
/* drop ref from kgnilnd_validate_tx_ev_id */
kgnilnd_admin_decref(conn->gnc_tx_in_use);
kgnilnd_conn_decref(conn);
}
}
int
kgnilnd_check_fma_send_cq(kgn_device_t *dev)
{
gni_return_t rrc;
__u64 event_data;
kgn_tx_ev_id_t ev_id;
kgn_tx_t *tx = NULL;
kgn_conn_t *conn = NULL;
int queued_fma, saw_reply, rc;
long num_processed = 0;
struct list_head *ctmp, *ctmpN;
for (;;) {
/* make sure we don't keep looping if we need to reset */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
return num_processed;
}
rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
if (!rc) {
/* we didn't get the mutex, so return that there is still work
* to be done */
return 1;
}
rrc = kgnilnd_cq_get_event(dev->gnd_snd_fma_cqh, &event_data);
kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
if (rrc == GNI_RC_NOT_DONE) {
CDEBUG(D_INFO,
"SMSG send CQ %d not ready (data %#llx) "
"processed %ld\n", dev->gnd_id, event_data,
num_processed);
if (num_processed > 0) {
spin_lock(&dev->gnd_lock);
if (!list_empty(&dev->gnd_delay_conns)) {
list_for_each_safe(ctmp, ctmpN, &dev->gnd_delay_conns) {
conn = list_entry(ctmp, kgn_conn_t, gnc_delaylist);
list_del_init(&conn->gnc_delaylist);
CDEBUG(D_NET, "Moving Conn %p from delay queue to ready_queue\n", conn);
kgnilnd_schedule_conn_nolock(conn);
}
spin_unlock(&dev->gnd_lock);
kgnilnd_schedule_device(dev);
} else {
spin_unlock(&dev->gnd_lock);
}
}
return num_processed;
}
dev->gnd_sched_alive = jiffies;
num_processed++;
LASSERTF(!GNI_CQ_OVERRUN(event_data),
"this is bad, somehow our credits didn't "
"protect us from CQ overrun\n");
LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_SMSG,
"rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
event_data, GNI_CQ_GET_TYPE(event_data));
/* if SMSG couldn't handle an error, time for conn to die */
if (unlikely(rrc == GNI_RC_TRANSACTION_ERROR)) {
char err_str[256];
/* need to take the write_lock to ensure atomicity
* on the conn state if we need to close it */
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn = kgnilnd_cqid2conn_locked(GNI_CQ_GET_INST_ID(event_data));
if (conn == NULL) {
/* Conn was destroyed? */
CDEBUG(D_NET,
"SMSG CQID lookup %#llx failed\n",
GNI_CQ_GET_INST_ID(event_data));
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
continue;
}
kgnilnd_cq_error_str(event_data, &err_str, 256);
CNETERR("SMSG send error to %s: rc %d (%s)\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
rrc, err_str);
kgnilnd_close_conn_locked(conn, -ECOMM);
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* no need to process rest of this tx -
* it is getting canceled */
continue;
}
/* fall through to GNI_RC_SUCCESS case */
ev_id.txe_smsg_id = GNI_CQ_GET_MSG_ID(event_data);
kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
if (conn == NULL || tx == NULL) {
/* either conn or tx was already nuked and this is a "late"
* completion, so drop it */
continue;
}
tx->tx_conn->gnc_last_tx_cq = jiffies;
if (tx->tx_msg.gnm_type == GNILND_MSG_NOOP) {
set_mb(conn->gnc_last_noop_cq, jiffies);
}
/* lock tx_list_state and tx_state */
kgnilnd_conn_mutex_lock(&conn->gnc_smsg_mutex);
spin_lock(&tx->tx_conn->gnc_list_lock);
GNITX_ASSERTF(tx, tx->tx_list_state == GNILND_TX_LIVE_FMAQ,
"state not GNILND_TX_LIVE_FMAQ", NULL);
GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_COMPLETION,
"not waiting for completion", NULL);
GNIDBG_TX(D_NET, tx, "SMSG complete tx_state %x rc %d",
tx->tx_state, rrc);
tx->tx_state &= ~GNILND_TX_WAITING_COMPLETION;
/* This will trigger other FMA sends that were
* pending this completion */
queued_fma = !list_empty(&tx->tx_conn->gnc_fmaq);
/* we either did not expect reply or we already got it */
saw_reply = !(tx->tx_state & GNILND_TX_WAITING_REPLY);
spin_unlock(&tx->tx_conn->gnc_list_lock);
kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
if (queued_fma) {
CDEBUG(D_NET, "scheduling conn 0x%p->%s for fmaq\n",
conn,
libcfs_nid2str(conn->gnc_peer->gnp_nid));
kgnilnd_schedule_conn(conn);
}
/* If saw_reply is false as soon as gnc_list_lock is dropped the tx could be nuked
* If saw_reply is true we know that the tx is safe to use as the other thread
* is already finished with it.
*/
if (saw_reply) {
/* no longer need to track on the live_fmaq */
kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
if (tx->tx_state & GNILND_TX_PENDING_RDMA) {
/* we already got reply & were waiting for
* completion of initial send */
/* to initiate RDMA transaction */
GNIDBG_TX(D_NET, tx,
"Pending RDMA 0x%p type 0x%02x",
tx->tx_msg.gnm_type);
tx->tx_state &= ~GNILND_TX_PENDING_RDMA;
rc = kgnilnd_send_mapped_tx(tx, 0);
GNITX_ASSERTF(tx, rc == 0, "RDMA send failed: %d\n", rc);
} else {
/* we are done with this tx */
GNIDBG_TX(D_NET, tx,
"Done with tx type 0x%02x",
tx->tx_msg.gnm_type);
kgnilnd_tx_done(tx, tx->tx_rc);
}
}
/* drop ref from kgnilnd_validate_tx_ev_id */
kgnilnd_admin_decref(conn->gnc_tx_in_use);
kgnilnd_conn_decref(conn);
/* if we are waiting for a REPLY, we'll handle the tx then */
} /* end for loop */
}
int
kgnilnd_check_fma_rcv_cq(kgn_device_t *dev)
{
kgn_conn_t *conn;
gni_return_t rrc;
__u64 event_data;
long num_processed = 0;
struct list_head *conns;
struct list_head *tmp;
int rc;
for (;;) {
/* make sure we don't keep looping if we need to reset */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
return num_processed;
}
rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
if (!rc) {
/* we didn't get the mutex, so return that there is still work
* to be done */
return 1;
}
rrc = kgnilnd_cq_get_event(dev->gnd_rcv_fma_cqh, &event_data);
kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
if (rrc == GNI_RC_NOT_DONE) {
CDEBUG(D_INFO, "SMSG RX CQ %d empty data %#llx "
"processed %ld\n",
dev->gnd_id, event_data, num_processed);
return num_processed;
}
dev->gnd_sched_alive = jiffies;
num_processed++;
/* this is the only CQ that can really handle transient
* CQ errors */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CQ_GET_EVENT)) {
rrc = cfs_fail_val ? cfs_fail_val
: GNI_RC_ERROR_RESOURCE;
if (rrc == GNI_RC_ERROR_RESOURCE) {
/* set overrun too */
event_data |= (1UL << 63);
LASSERTF(GNI_CQ_OVERRUN(event_data),
"(1UL << 63) is no longer the bit to set to indicate CQ_OVERRUN\n");
}
}
/* sender should get error event too and take care
of failed transaction by re-transmitting */
if (rrc == GNI_RC_TRANSACTION_ERROR) {
CDEBUG(D_NET, "SMSG RX CQ error %#llx\n", event_data);
continue;
}
if (likely(!GNI_CQ_OVERRUN(event_data))) {
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn = kgnilnd_cqid2conn_locked(
GNI_CQ_GET_INST_ID(event_data));
if (conn == NULL) {
CDEBUG(D_NET, "SMSG RX CQID lookup %llu "
"failed, dropping event %#llx\n",
GNI_CQ_GET_INST_ID(event_data),
event_data);
} else {
CDEBUG(D_NET, "SMSG RX: CQID %llu "
"conn %p->%s\n",
GNI_CQ_GET_INST_ID(event_data),
conn, conn->gnc_peer ?
libcfs_nid2str(conn->gnc_peer->gnp_nid) :
"<?>");
conn->gnc_last_rx_cq = jiffies;
/* stash first rx so we can clear out purgatory.
*/
if (conn->gnc_first_rx == 0) {
conn->gnc_first_rx = jiffies;
}
kgnilnd_peer_alive(conn->gnc_peer);
kgnilnd_schedule_conn(conn);
}
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
continue;
}
/* FMA CQ has overflowed: check ALL conns */
CNETERR("SMSG RX CQ overflow: scheduling ALL "
"conns on device %d\n", dev->gnd_id);
for (rc = 0; rc < *kgnilnd_tunables.kgn_peer_hash_size; rc++) {
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
conns = &kgnilnd_data.kgn_conns[rc];
list_for_each(tmp, conns) {
conn = list_entry(tmp, kgn_conn_t,
gnc_hashlist);
if (conn->gnc_device == dev) {
kgnilnd_schedule_conn(conn);
conn->gnc_last_rx_cq = jiffies;
}
}
/* don't block write lockers for too long... */
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
}
}
}
/* try_map_if_full should only be used when processing TX from list of
* backlog TX waiting on mappings to free up
*
* Return Codes:
* try_map_if_full = 0: 0 (sent or queued), (-|+)errno failure of kgnilnd_sendmsg
* try_map_if_full = 1: 0 (sent), -ENOMEM for caller to requeue, (-|+)errno failure of kgnilnd_sendmsg */
int
kgnilnd_send_mapped_tx(kgn_tx_t *tx, int try_map_if_full)
{
/* slight bit of race if multiple people calling, but at worst we'll have
* order altered just a bit... which would not be determenistic anyways */
int rc = atomic_read(&tx->tx_conn->gnc_device->gnd_nq_map);
GNIDBG_TX(D_NET, tx, "try %d nq_map %d", try_map_if_full, rc);
/* We know that we have a GART reservation that should guarantee forward progress.
* This means we don't need to take any extraordinary efforts if we are failing
* mappings here - even if we are holding a very small number of these. */
if (try_map_if_full || (rc == 0)) {
rc = kgnilnd_map_buffer(tx);
}
/* rc should be 0 if we mapped successfully here, if non-zero
* we are queueing */
if (rc != 0) {
/* if try_map_if_full set, they handle requeuing */
if (unlikely(try_map_if_full)) {
RETURN(rc);
} else {
spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
/* make sure we wake up sched to run this */
kgnilnd_schedule_device(tx->tx_conn->gnc_device);
/* return 0 as this is now queued for later sending */
RETURN(0);
}
}
switch (tx->tx_msg.gnm_type) {
default:
LBUG();
break;
/* GET_REQ and PUT_ACK are outbound messages sending our mapping key to
* remote node where the RDMA will be started
* Special case -EAGAIN logic - this should just queued as if the mapping couldn't
* be satisified. The rest of the errors are "hard" errors that require
* upper layers to handle themselves.
* If kgnilnd_post_rdma returns a resource error, kgnilnd_rdma will put
* the tx back on the TX_MAPQ. When this tx is pulled back off the MAPQ,
* it's gnm_type will now be GNILND_MSG_PUT_DONE or
* GNILND_MSG_GET_DONE_REV.
*/
case GNILND_MSG_GET_REQ:
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GET_REQ_AGAIN)) {
tx->tx_state |= GNILND_TX_FAIL_SMSG;
}
/* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
break;
case GNILND_MSG_PUT_ACK:
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN)) {
tx->tx_state |= GNILND_TX_FAIL_SMSG;
}
/* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
break;
/* PUT_REQ and GET_DONE are where we do the actual RDMA */
case GNILND_MSG_PUT_DONE:
case GNILND_MSG_PUT_REQ:
rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE,
&tx->tx_putinfo.gnpam_desc,
tx->tx_putinfo.gnpam_desc.gnrd_nob,
tx->tx_putinfo.gnpam_dst_cookie);
RETURN(try_map_if_full ? rc : 0);
break;
case GNILND_MSG_GET_DONE:
rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE,
&tx->tx_getinfo.gngm_desc,
tx->tx_lntmsg[0]->msg_len,
tx->tx_getinfo.gngm_cookie);
RETURN(try_map_if_full ? rc : 0);
break;
case GNILND_MSG_PUT_REQ_REV:
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
kgnilnd_compute_rdma_cksum(tx, tx->tx_nob);
tx->tx_msg.gnm_u.get.gngm_payload_cksum = tx->tx_msg.gnm_payload_cksum;
rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
break;
case GNILND_MSG_PUT_DONE_REV:
rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE_REV,
&tx->tx_getinfo.gngm_desc,
tx->tx_nob,
tx->tx_getinfo.gngm_cookie);
RETURN(try_map_if_full ? rc : 0);
break;
case GNILND_MSG_GET_ACK_REV:
tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
/* LNET_GETS are a special case for parse */
kgnilnd_compute_rdma_cksum(tx, tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob);
tx->tx_msg.gnm_u.putack.gnpam_payload_cksum = tx->tx_msg.gnm_payload_cksum;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN))
tx->tx_state |= GNILND_TX_FAIL_SMSG;
/* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
break;
case GNILND_MSG_GET_DONE_REV:
case GNILND_MSG_GET_REQ_REV:
rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE_REV,
&tx->tx_putinfo.gnpam_desc,
tx->tx_putinfo.gnpam_desc.gnrd_nob,
tx->tx_putinfo.gnpam_dst_cookie);
RETURN(try_map_if_full ? rc : 0);
break;
}
RETURN(rc);
}
void
kgnilnd_process_fmaq(kgn_conn_t *conn)
{
int more_to_do = 0;
kgn_tx_t *tx = NULL;
void *buffer = NULL;
unsigned int nob = 0;
int rc;
/* NB 1. kgnilnd_sendmsg() may fail if I'm out of credits right now.
* However I will be rescheduled by an FMA completion event
* when I eventually get some.
* NB 2. Sampling gnc_state here races with setting it elsewhere.
* But it doesn't matter if I try to send a "real" message just
* as I start closing because I'll get scheduled to send the
* close anyway. */
/* Short circuit if the ep_handle is null we cant send anyway. */
if (conn->gnc_ephandle == NULL)
return;
LASSERTF(!conn->gnc_close_sent, "Conn %px close was sent\n", conn);
spin_lock(&conn->gnc_list_lock);
if (list_empty(&conn->gnc_fmaq)) {
int keepalive = GNILND_TO2KA(conn->gnc_timeout);
spin_unlock(&conn->gnc_list_lock);
if (time_after_eq(jiffies, conn->gnc_last_tx + cfs_time_seconds(keepalive))) {
CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%d)) "
"last %lu/%lu/%lu %lus/%lus/%lus\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
cfs_duration_sec(jiffies - conn->gnc_last_tx),
keepalive,
conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
conn->gnc_last_noop_cq,
cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
atomic_inc(&conn->gnc_sched_noop);
set_mb(conn->gnc_last_noop_want, jiffies);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
return;
tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP,
lnet_nid_to_nid4(&conn->gnc_peer->gnp_net->gnn_ni->ni_nid));
if (tx != NULL) {
int rc;
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0) {
kgnilnd_tx_done(tx, rc);
return;
}
}
}
} else {
tx = list_first_entry(&conn->gnc_fmaq, kgn_tx_t, tx_list);
/* move from fmaq to allocd, kgnilnd_sendmsg will move to live_fmaq */
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
more_to_do = !list_empty(&conn->gnc_fmaq);
spin_unlock(&conn->gnc_list_lock);
}
/* if there is no real TX or no NOOP to send, bail */
if (tx == NULL) {
return;
}
if (!tx->tx_retrans)
tx->tx_cred_wait = jiffies;
GNITX_ASSERTF(tx, tx->tx_id.txe_smsg_id != 0,
"tx with zero id", NULL);
CDEBUG(D_NET, "sending regular msg: %p, type %s(0x%02x), cookie %#llx\n",
tx, kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
tx->tx_msg.gnm_type, tx->tx_id.txe_cookie);
rc = 0;
switch (tx->tx_msg.gnm_type) {
default:
LBUG();
case GNILND_MSG_NOOP:
case GNILND_MSG_CLOSE:
case GNILND_MSG_IMMEDIATE:
tx->tx_state = GNILND_TX_WAITING_COMPLETION;
buffer = tx->tx_buffer;
nob = tx->tx_nob;
break;
case GNILND_MSG_GET_DONE:
case GNILND_MSG_PUT_DONE:
case GNILND_MSG_PUT_DONE_REV:
case GNILND_MSG_GET_DONE_REV:
case GNILND_MSG_PUT_NAK:
case GNILND_MSG_GET_NAK:
case GNILND_MSG_GET_NAK_REV:
case GNILND_MSG_PUT_NAK_REV:
tx->tx_state = GNILND_TX_WAITING_COMPLETION;
break;
case GNILND_MSG_PUT_REQ:
case GNILND_MSG_GET_REQ_REV:
tx->tx_msg.gnm_u.putreq.gnprm_cookie = tx->tx_id.txe_cookie;
fallthrough;
case GNILND_MSG_PUT_ACK:
case GNILND_MSG_PUT_REQ_REV:
case GNILND_MSG_GET_ACK_REV:
case GNILND_MSG_GET_REQ:
/* This is really only to handle the retransmit of SMSG once these
* two messages are setup in send_mapped_tx */
tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
break;
}
if (likely(rc == 0)) {
rc = kgnilnd_sendmsg(tx, buffer, nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
}
if (rc > 0) {
/* don't explicitly reschedule here - we are short credits and will rely on
* kgnilnd_sendmsg to resched the conn if need be */
more_to_do = 0;
} else if (rc < 0) {
/* bail: it wasn't sent and we didn't get EAGAIN indicating we should retrans
* almost certainly a software bug, but lets play nice with the other kids */
kgnilnd_tx_done(tx, rc);
/* just for fun, kick peer in arse - resetting conn might help to correct
* this almost certainly buggy software caused return code */
kgnilnd_close_conn(conn, rc);
}
if (more_to_do) {
CDEBUG(D_NET, "Rescheduling %p (more to do)\n", conn);
kgnilnd_schedule_conn(conn);
}
}
int
kgnilnd_process_rdmaq(kgn_device_t *dev)
{
int found_work = 0;
kgn_tx_t *tx;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMAQ)) {
RETURN(found_work);
}
if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
unsigned long dead_bump;
long new_ok;
/* if we think we need to adjust, take lock to serialize and recheck */
spin_lock(&dev->gnd_rdmaq_lock);
if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
timer_delete_sync(&dev->gnd_rdmaq_timer);
dead_bump = cfs_time_seconds(1) / *kgnilnd_tunables.kgn_rdmaq_intervals;
/* roll the bucket forward */
dev->gnd_rdmaq_deadline = jiffies + dead_bump;
if (kgnilnd_data.kgn_rdmaq_override &&
(*kgnilnd_tunables.kgn_rdmaq_intervals != 0)) {
new_ok = kgnilnd_data.kgn_rdmaq_override / *kgnilnd_tunables.kgn_rdmaq_intervals;
} else {
new_ok = ~0UL >> 1;
}
/* roll current outstanding forward to make sure we carry outstanding
* committment forward
* new_ok starts out as the whole interval value
* - first subtract bytes_out from last interval, as that would push us over
* strict limits for this interval
* - second, set bytes_ok to new_ok to ensure it doesn't exceed the current auth
*
* there is a small race here if someone is actively processing mappings and
* adding to rdmaq_bytes_out, but it should be small as the mappings are triggered
* quite quickly after kgnilnd_auth_rdma_bytes gives us the go-ahead
* - if this gives us problems in the future, we could use a read/write lock
* to protect the resetting of these values */
new_ok -= atomic64_read(&dev->gnd_rdmaq_bytes_out);
atomic64_set(&dev->gnd_rdmaq_bytes_ok, new_ok);
CDEBUG(D_NET, "resetting rdmaq bytes to %lld, deadline +%lu -> %lu, current out %lld\n",
(s64)atomic64_read(&dev->gnd_rdmaq_bytes_ok), dead_bump, dev->gnd_rdmaq_deadline,
(s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
}
spin_unlock(&dev->gnd_rdmaq_lock);
}
spin_lock(&dev->gnd_rdmaq_lock);
while (!list_empty(&dev->gnd_rdmaq)) {
int rc;
/* make sure we break out early on quiesce */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
/* always break with lock held - we unlock outside loop */
break;
}
tx = list_first_entry(&dev->gnd_rdmaq, kgn_tx_t, tx_list);
kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
found_work++;
/* sample with lock held, serializing with kgnilnd_complete_closed_conn */
if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
/* if conn is dying, mark tx in tx_ref_table for
* kgnilnd_complete_closed_conn to finish up */
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
/* tx was moved to DYING, get next */
continue;
}
spin_unlock(&dev->gnd_rdmaq_lock);
rc = kgnilnd_auth_rdma_bytes(dev, tx);
spin_lock(&dev->gnd_rdmaq_lock);
if (rc < 0) {
/* no ticket! add back to head */
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_RDMAQ, 0);
/* clear found_work so scheduler threads wait for timer */
found_work = 0;
break;
} else {
/* TX is GO for launch */
tx->tx_qtime = jiffies;
kgnilnd_send_mapped_tx(tx, 0);
found_work++;
}
}
spin_unlock(&dev->gnd_rdmaq_lock);
RETURN(found_work);
}
static inline void
kgnilnd_swab_rdma_desc(kgn_rdma_desc_t *d)
{
__swab64s(&d->gnrd_key.qword1);
__swab64s(&d->gnrd_key.qword2);
__swab64s(&d->gnrd_addr);
__swab32s(&d->gnrd_nob);
}
#define kgnilnd_match_reply_either(w, x, y, z) _kgnilnd_match_reply(w, x, y, z)
#define kgnilnd_match_reply(x, y, z) _kgnilnd_match_reply(x, y, GNILND_MSG_NONE, z)
kgn_tx_t *
_kgnilnd_match_reply(kgn_conn_t *conn, int type1, int type2, __u64 cookie)
{
kgn_tx_ev_id_t ev_id;
kgn_tx_t *tx;
/* we use the cookie from the original TX, so we can find the match
* by parsing that and using the txe_idx */
ev_id.txe_cookie = cookie;
tx = conn->gnc_tx_ref_table[ev_id.txe_idx];
if (tx != NULL) {
/* check tx to make sure kgni didn't eat it */
GNITX_ASSERTF(tx, tx->tx_msg.gnm_magic == GNILND_MSG_MAGIC,
"came back from kgni with bad magic %x\n", tx->tx_msg.gnm_magic);
GNITX_ASSERTF(tx, ((tx->tx_id.txe_idx == ev_id.txe_idx) &&
(tx->tx_id.txe_cookie = cookie)),
"conn 0x%p->%s tx_ref_table hosed: wanted txe_cookie %#llx txe_idx %d found tx %px cookie %#llx txe_idx %d\n",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
cookie, ev_id.txe_idx,
tx, tx->tx_id.txe_cookie, tx->tx_id.txe_idx);
LASSERTF((((tx->tx_msg.gnm_type == type1) || (tx->tx_msg.gnm_type == type2)) &&
(tx->tx_state & GNILND_TX_WAITING_REPLY)),
"Unexpected TX type (%x, %x or %x) "
"or state (%x, expected +%x) "
"matched reply from %s\n",
tx->tx_msg.gnm_type, type1, type2,
tx->tx_state, GNILND_TX_WAITING_REPLY,
libcfs_nid2str(conn->gnc_peer->gnp_nid));
} else {
CWARN("Unmatched reply %02x, or %02x/%#llx from %s\n",
type1, type2, cookie, libcfs_nid2str(conn->gnc_peer->gnp_nid));
}
return tx;
}
static inline void
kgnilnd_complete_tx(kgn_tx_t *tx, int rc)
{
int complete = 0;
kgn_conn_t *conn = tx->tx_conn;
__u64 nob = tx->tx_nob;
__u32 physnop = tx->tx_phys_npages;
int id = tx->tx_id.txe_smsg_id;
int buftype = tx->tx_buftype;
gni_mem_handle_t hndl;
hndl.qword1 = tx->tx_map_key.qword1;
hndl.qword2 = tx->tx_map_key.qword2;
spin_lock(&conn->gnc_list_lock);
GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
"not waiting for reply", NULL);
tx->tx_rc = rc;
tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
if (rc == -EFAULT) {
CDEBUG(D_NETERROR, "Error %d TX data: TX %p tx_id %x nob %16llu physnop %8d buffertype %#8x MemHandle %#llx.%#llxx\n",
rc, tx, id, nob, physnop, buftype, hndl.qword1, hndl.qword2);
if(*kgnilnd_tunables.kgn_efault_lbug) {
GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
"error %d on tx 0x%p->%s id %u/%d state %s age %ds",
rc, tx, conn ?
libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
kgnilnd_tx_state2str(tx->tx_list_state),
cfs_duration_sec((unsigned long) jiffies - tx->tx_qtime));
LBUG();
}
}
if (!(tx->tx_state & GNILND_TX_WAITING_COMPLETION)) {
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
/* sample under lock as follow on steps require gnc_list_lock
* - or call kgnilnd_tx_done which requires no locks held over
* call to lnet_finalize */
complete = 1;
}
spin_unlock(&conn->gnc_list_lock);
if (complete) {
kgnilnd_tx_done(tx, tx->tx_rc);
}
}
static inline void
kgnilnd_finalize_rx_done(kgn_tx_t *tx, kgn_msg_t *msg)
{
int rc;
kgn_conn_t *conn = tx->tx_conn;
atomic_inc(&conn->gnc_device->gnd_rdma_nrx);
atomic64_add(tx->tx_nob, &conn->gnc_device->gnd_rdma_rxbytes);
/* the gncm_retval is passed in for PUTs */
rc = kgnilnd_verify_rdma_cksum(tx, msg->gnm_payload_cksum,
msg->gnm_u.completion.gncm_retval);
kgnilnd_complete_tx(tx, rc);
}
void
kgnilnd_check_fma_rx(kgn_conn_t *conn)
{
__u32 seq;
kgn_tx_t *tx;
kgn_rx_t *rx;
kgn_msg_t *msg;
void *prefix;
gni_return_t rrc;
kgn_peer_t *peer = conn->gnc_peer;
kgn_net_t *net;
int rc = 0;
__u16 tmp_cksum = 0, msg_cksum = 0;
int repost = 1, saw_complete;
unsigned long timestamp, newest_last_rx, timeout;
int last_seq;
struct lnet_hdr hdr;
struct lnet_nid srcnid;
ENTRY;
/* Short circuit if the ep_handle is null.
* It's likely that its about to be closed as stale.
*/
if (conn->gnc_ephandle == NULL)
RETURN_EXIT;
timestamp = jiffies;
kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
/* delay in jiffies - we are really concerned only with things that
* result in a schedule() or really holding this off for long times .
* NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
/* Resample current time as we have no idea how long it took to get the mutex */
timestamp = jiffies;
/* We check here when the last time we received an rx, we do this before
* we call getnext in case the thread has been blocked for a while. If we
* havent received an rx since our timeout value we close the connection
* as we should assume the other side has closed the connection. This will
* stop us from sending replies to a mailbox that is already in purgatory.
*/
timeout = cfs_time_seconds(conn->gnc_timeout);
newest_last_rx = GNILND_LASTRX(conn);
/* Error injection to validate that timestamp checking works and closing the conn */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RECV_TIMEOUT)) {
timestamp = timestamp + (GNILND_TIMEOUTRX(timeout) * 2);
}
if (time_after_eq(timestamp, newest_last_rx + (GNILND_TIMEOUTRX(timeout)))) {
GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn, "Cant receive from %s after timeout lapse of %lu; TO %lu",
libcfs_nid2str(conn->gnc_peer->gnp_nid),
cfs_duration_sec(timestamp - newest_last_rx),
cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
rc = -ETIME;
kgnilnd_close_conn(conn, rc);
RETURN_EXIT;
}
rrc = kgnilnd_smsg_getnext(conn->gnc_ephandle, &prefix);
if (rrc == GNI_RC_NOT_DONE) {
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
CDEBUG(D_INFO, "SMSG RX empty conn 0x%p\n", conn);
RETURN_EXIT;
}
/* Instead of asserting when we get mailbox corruption lets attempt to
* close the conn and recover. We can put the conn/mailbox into
* purgatory and let purgatory deal with the problem. If we see
* this NETTERROR reported on production systems in large amounts
* we will need to revisit the state machine to see if we can tighten
* it up further to improve data protection.
*/
if (rrc == GNI_RC_INVALID_STATE) {
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
GNIDBG_CONN(D_NETERROR | D_CONSOLE, conn, "Mailbox corruption "
"detected closing conn %p from peer %s\n", conn,
libcfs_nid2str(conn->gnc_peer->gnp_nid));
rc = -EIO;
kgnilnd_close_conn(conn, rc);
RETURN_EXIT;
}
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc %d on conn %px from peer %s\n",
rrc, conn, libcfs_nid2str(peer->gnp_nid));
msg = (kgn_msg_t *)prefix;
rx = kgnilnd_alloc_rx();
if (rx == NULL) {
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
kgnilnd_release_msg(conn);
GNIDBG_MSG(D_NETERROR, msg, "Dropping SMSG RX from 0x%p->%s, no RX memory",
conn, libcfs_nid2str(peer->gnp_nid));
RETURN_EXIT;
}
GNIDBG_MSG(D_INFO, msg, "SMSG RX on %p", conn);
timestamp = conn->gnc_last_rx;
seq = last_seq = atomic_read(&conn->gnc_rx_seq);
atomic_inc(&conn->gnc_rx_seq);
conn->gnc_last_rx = jiffies;
/* stash first rx so we can clear out purgatory
*/
if (conn->gnc_first_rx == 0)
conn->gnc_first_rx = jiffies;
/* needs to linger to protect gnc_rx_seq like we do with gnc_tx_seq */
kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
kgnilnd_peer_alive(conn->gnc_peer);
rx->grx_msg = msg;
rx->grx_conn = conn;
rx->grx_eager = 0;
ktime_get_ts64(&rx->grx_received);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NET_LOOKUP)) {
rc = -ENONET;
} else {
rc = kgnilnd_find_net(msg->gnm_srcnid, &net);
}
if (rc < 0) {
GOTO(out, rc);
} else {
kgnilnd_net_decref(net);
}
if (*kgnilnd_tunables.kgn_checksum && !msg->gnm_cksum)
GNIDBG_MSG(D_WARNING, msg, "no msg header checksum when enabled");
/* XXX Nic: Do we need to swab cksum */
if (msg->gnm_cksum != 0) {
msg_cksum = msg->gnm_cksum;
msg->gnm_cksum = 0;
tmp_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
if (tmp_cksum != msg_cksum) {
GNIDBG_MSG(D_NETERROR, msg, "Bad hdr checksum (%x expected %x)",
tmp_cksum, msg_cksum);
kgnilnd_dump_msg(D_BUFFS, msg);
rc = -ENOKEY;
GOTO(out, rc);
}
}
/* restore checksum for future debug messages */
msg->gnm_cksum = tmp_cksum;
if (msg->gnm_magic != GNILND_MSG_MAGIC) {
if (__swab32(msg->gnm_magic) != GNILND_MSG_MAGIC) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected magic %08x from %s",
msg->gnm_magic, libcfs_nid2str(peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
__swab32s(&msg->gnm_magic);
__swab16s(&msg->gnm_version);
__swab16s(&msg->gnm_type);
__swab64s(&msg->gnm_srcnid);
__swab64s(&msg->gnm_connstamp);
__swab32s(&msg->gnm_seq);
/* NB message type checked below; NOT here... */
switch (msg->gnm_type) {
case GNILND_MSG_GET_ACK_REV:
case GNILND_MSG_PUT_ACK:
kgnilnd_swab_rdma_desc(&msg->gnm_u.putack.gnpam_desc);
break;
case GNILND_MSG_PUT_REQ_REV:
case GNILND_MSG_GET_REQ:
kgnilnd_swab_rdma_desc(&msg->gnm_u.get.gngm_desc);
break;
default:
break;
}
}
if (msg->gnm_version != GNILND_MSG_VERSION) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected protocol version %d from %s",
msg->gnm_version, libcfs_nid2str(peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
if (LNET_NIDADDR(msg->gnm_srcnid) != LNET_NIDADDR(peer->gnp_nid)) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected peer %s from %s",
libcfs_nid2str(msg->gnm_srcnid),
libcfs_nid2str(peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
if (msg->gnm_connstamp != conn->gnc_peer_connstamp) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected connstamp %#llx(%#llx"
" expected) from %s",
msg->gnm_connstamp, conn->gnc_peer_connstamp,
libcfs_nid2str(peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
if (msg->gnm_seq != seq) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected sequence number %d(%d expected) from %s",
msg->gnm_seq, seq, libcfs_nid2str(peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
atomic_inc(&conn->gnc_device->gnd_short_nrx);
if (msg->gnm_type == GNILND_MSG_CLOSE) {
CDEBUG(D_NETTRACE, "%s sent us CLOSE msg\n",
libcfs_nid2str(conn->gnc_peer->gnp_nid));
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn->gnc_close_recvd = GNILND_CLOSE_RX;
conn->gnc_peer_error = msg->gnm_u.completion.gncm_retval;
/* double check state with lock held */
if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
/* only error if we are not already closing */
if (conn->gnc_peer_error == -ETIMEDOUT) {
unsigned long now = jiffies;
CNETERR("peer 0x%p->%s closed connection 0x%p due to timeout. "
"Is node down? "
"RX %d @ %lus/%lus; TX %d @ %lus/%lus; "
"NOOP %lus/%lus/%lus; sched %lus/%lus/%lus ago\n",
conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
conn, last_seq,
cfs_duration_sec(now - timestamp),
cfs_duration_sec(now - conn->gnc_last_rx_cq),
atomic_read(&conn->gnc_tx_seq),
cfs_duration_sec(now - conn->gnc_last_tx),
cfs_duration_sec(now - conn->gnc_last_tx_cq),
cfs_duration_sec(now - conn->gnc_last_noop_want),
cfs_duration_sec(now - conn->gnc_last_noop_sent),
cfs_duration_sec(now - conn->gnc_last_noop_cq),
cfs_duration_sec(now - conn->gnc_last_sched_ask),
cfs_duration_sec(now - conn->gnc_last_sched_do),
cfs_duration_sec(now - conn->gnc_device->gnd_sched_alive));
}
kgnilnd_close_conn_locked(conn, -ECONNRESET);
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
GOTO(out, rc);
}
if (conn->gnc_close_recvd) {
GNIDBG_MSG(D_NETERROR, msg, "Unexpected message %s(%d/%d) after CLOSE from %s",
kgnilnd_msgtype2str(msg->gnm_type),
msg->gnm_type, conn->gnc_close_recvd,
libcfs_nid2str(conn->gnc_peer->gnp_nid));
rc = -EPROTO;
GOTO(out, rc);
}
if (conn->gnc_state != GNILND_CONN_ESTABLISHED) {
/* XXX Nic: log message received on bad connection state */
GOTO(out, rc);
}
switch (msg->gnm_type) {
case GNILND_MSG_NOOP:
/* Nothing to do; just a keepalive */
break;
case GNILND_MSG_IMMEDIATE:
/* only get SMSG payload for IMMEDIATE */
atomic64_add(msg->gnm_payload_len, &conn->gnc_device->gnd_short_rxbytes);
lnet_hdr_from_nid4(&hdr, &msg->gnm_u.immediate.gnim_hdr);
lnet_nid4_to_nid(msg->gnm_srcnid, &srcnid);
rc = lnet_parse(net->gnn_ni, &hdr, &srcnid, rx, 0);
repost = rc < 0;
break;
case GNILND_MSG_GET_REQ_REV:
case GNILND_MSG_PUT_REQ:
lnet_hdr_from_nid4(&hdr, &msg->gnm_u.putreq.gnprm_hdr);
lnet_nid4_to_nid(msg->gnm_srcnid, &srcnid);
rc = lnet_parse(net->gnn_ni, &hdr, &srcnid, rx, 1);
repost = rc < 0;
break;
case GNILND_MSG_GET_NAK_REV:
tx = kgnilnd_match_reply_either(conn, GNILND_MSG_GET_REQ_REV, GNILND_MSG_GET_ACK_REV,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
break;
case GNILND_MSG_PUT_NAK:
tx = kgnilnd_match_reply_either(conn, GNILND_MSG_PUT_REQ, GNILND_MSG_PUT_ACK,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
break;
case GNILND_MSG_PUT_ACK:
tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ,
msg->gnm_u.putack.gnpam_src_cookie);
if (tx == NULL)
break;
/* store putack data for later: deferred rdma or re-try */
tx->tx_putinfo = msg->gnm_u.putack;
saw_complete = 0;
spin_lock(&tx->tx_conn->gnc_list_lock);
GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
"not waiting for reply", NULL);
tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
/* sample under lock as follow on steps require gnc_list_lock
* - or call kgnilnd_tx_done which requires no locks held over
* call to lnet_finalize */
saw_complete = 1;
} else {
/* cannot launch rdma if still waiting for fma-msg completion */
CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
"wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
tx->tx_state |= GNILND_TX_PENDING_RDMA;
}
spin_unlock(&tx->tx_conn->gnc_list_lock);
if (saw_complete) {
rc = kgnilnd_send_mapped_tx(tx, 0);
if (rc < 0)
kgnilnd_tx_done(tx, rc);
}
break;
case GNILND_MSG_GET_ACK_REV:
tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ_REV,
msg->gnm_u.putack.gnpam_src_cookie);
if (tx == NULL)
break;
/* store putack data for later: deferred rdma or re-try */
tx->tx_putinfo = msg->gnm_u.putack;
saw_complete = 0;
spin_lock(&tx->tx_conn->gnc_list_lock);
GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
"not waiting for reply", NULL);
tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
/* sample under lock as follow on steps require gnc_list_lock
* - or call kgnilnd_tx_done which requires no locks held over
* call to lnet_finalize */
saw_complete = 1;
} else {
/* cannot launch rdma if still waiting for fma-msg completion */
CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
"wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
tx->tx_state |= GNILND_TX_PENDING_RDMA;
}
spin_unlock(&tx->tx_conn->gnc_list_lock);
if (saw_complete) {
rc = kgnilnd_send_mapped_tx(tx, 0);
if (rc < 0)
kgnilnd_tx_done(tx, rc);
}
break;
case GNILND_MSG_PUT_DONE:
tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_ACK,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
kgnilnd_finalize_rx_done(tx, msg);
break;
case GNILND_MSG_PUT_REQ_REV:
case GNILND_MSG_GET_REQ:
lnet_hdr_from_nid4(&hdr, &msg->gnm_u.get.gngm_hdr);
lnet_nid4_to_nid(msg->gnm_srcnid, &srcnid);
rc = lnet_parse(net->gnn_ni, &hdr, &srcnid, rx, 1);
repost = rc < 0;
break;
case GNILND_MSG_GET_NAK:
tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
break;
case GNILND_MSG_GET_DONE:
tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
lnet_set_reply_msg_len(net->gnn_ni, tx->tx_lntmsg[1],
msg->gnm_u.completion.gncm_retval);
kgnilnd_finalize_rx_done(tx, msg);
break;
case GNILND_MSG_GET_DONE_REV:
tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_ACK_REV,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
kgnilnd_finalize_rx_done(tx, msg);
break;
case GNILND_MSG_PUT_DONE_REV:
tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
kgnilnd_finalize_rx_done(tx, msg);
break;
case GNILND_MSG_PUT_NAK_REV:
tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
msg->gnm_u.completion.gncm_cookie);
if (tx == NULL)
break;
GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
"bad tx buftype %d", tx->tx_buftype);
kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
break;
}
out:
if (rc < 0) /* protocol/comms error */
kgnilnd_close_conn(conn, rc);
if (repost && rx != NULL) {
kgnilnd_consume_rx(rx);
}
/* we got an event so assume more there and call for reschedule */
if (rc >= 0)
kgnilnd_schedule_conn(conn);
EXIT;
}
/* Do the failure injections that we need to affect conn processing in the following function.
* When writing tests that use this function make sure to use a fail_loc with a fail mask.
* If you dont you can cause the scheduler threads to spin on the conn without it leaving
* process_conns.
*
* intent is used to signal the calling function whether or not the conn needs to be rescheduled.
*/
static inline int
kgnilnd_check_conn_fail_loc(kgn_device_t *dev, kgn_conn_t *conn, int *intent)
{
int rc = 0;
/* short circuit out when not set */
if (likely(!cfs_fail_loc)) {
RETURN(rc);
}
/* failure injection to test for stack reset clean ups */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_CLOSING)) {
/* we can't rely on busy loops being nice enough to get the
* stack reset triggered - it'd just spin on this conn */
CFS_RACE(CFS_FAIL_GNI_DROP_CLOSING);
rc = 1;
*intent = 1;
GOTO(did_fail_loc, rc);
}
if (conn->gnc_state == GNILND_CONN_DESTROY_EP) {
/* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_DESTROY_EP)) {
CFS_RACE(CFS_FAIL_GNI_DROP_DESTROY_EP);
rc = 1;
*intent = 1;
GOTO(did_fail_loc, rc);
}
}
/* CFS_FAIL_GNI_FINISH_PURG2 is used to stop a connection from fully closing. This scheduler
* will spin on the CFS_FAIL_TIMEOUT until the fail_loc is cleared at which time the connection
* will be closed by kgnilnd_complete_closed_conn.
*/
if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG2)) {
while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_FINISH_PURG2, 1)) {};
rc = 1;
*intent = 1;
GOTO(did_fail_loc, rc);
}
/* this one is a bit gross - we can't hold the mutex from process_conns
* across a CFS_RACE here - it'd block the conn threads from doing an ep_bind
* and moving onto finish_connect
* so, we'll just set the rc - kgnilnd_process_conns will clear
* found_work on a fail_loc, getting the scheduler thread to call schedule()
* and effectively getting this thread to sleep */
if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG)) {
rc = 1;
*intent = 1;
GOTO(did_fail_loc, rc);
}
did_fail_loc:
RETURN(rc);
}
static inline void
kgnilnd_send_conn_close(kgn_conn_t *conn)
{
kgn_tx_t *tx;
/* we are closing the conn - we will try to send the CLOSE msg
* but will not wait for anything else to flush */
/* send the close if not already done so or received one */
if (!conn->gnc_close_sent && !conn->gnc_close_recvd) {
/* set close_sent regardless of the success of the
* CLOSE message. We are going to try once and then
* kick him out of the sandbox */
conn->gnc_close_sent = 1;
mb();
/* EP might be null already if remote side initiated a new connection.
* kgnilnd_finish_connect destroys existing ep_handles before wiring up the new connection,
* so this check is here to make sure we dont attempt to send with a null ep_handle.
*/
if (conn->gnc_ephandle != NULL) {
int rc = 0;
tx = kgnilnd_new_tx_msg(GNILND_MSG_CLOSE,
lnet_nid_to_nid4(&conn->gnc_peer->gnp_net->gnn_ni->ni_nid));
if (tx != NULL) {
tx->tx_msg.gnm_u.completion.gncm_retval = conn->gnc_error;
tx->tx_state = GNILND_TX_WAITING_COMPLETION;
tx->tx_qtime = jiffies;
if (tx->tx_id.txe_idx == 0) {
rc = kgnilnd_set_tx_id(tx, conn);
if (rc != 0) {
kgnilnd_tx_done(tx, rc);
}
}
CDEBUG(D_NETTRACE, "sending close with errno %d\n",
conn->gnc_error);
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CLOSE_SEND)) {
kgnilnd_tx_done(tx, -EAGAIN);
} else if (!rc) {
rc = kgnilnd_sendmsg(tx, NULL, 0, NULL, GNILND_TX_FMAQ);
if (rc) {
/* It wasnt sent and we dont care. */
kgnilnd_tx_done(tx, rc);
}
}
}
}
}
/* When changing gnc_state we need to take the kgn_peer_conn_lock */
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn->gnc_state = GNILND_CONN_CLOSED;
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* mark this conn as CLOSED now that we processed it
* do after TX, so we can use CLOSING in asserts */
mb();
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSED)) {
/* simulate a RX CLOSE after the timeout but before
* the scheduler thread gets it */
conn->gnc_close_recvd = GNILND_CLOSE_INJECT2;
conn->gnc_peer_error = -ETIMEDOUT;
}
/* schedule to allow potential CLOSE and get the complete phase run */
kgnilnd_schedule_conn(conn);
}
int
kgnilnd_process_mapped_tx(kgn_device_t *dev)
{
int found_work = 0;
int rc = 0;
kgn_tx_t *tx;
int fast_remaps = GNILND_FAST_MAPPING_TRY;
int log_retrans, log_retrans_level;
static int last_map_version;
ENTRY;
spin_lock(&dev->gnd_lock);
if (list_empty(&dev->gnd_map_tx)) {
/* if the list is empty make sure we dont have a timer running */
timer_delete_sync(&dev->gnd_map_timer);
spin_unlock(&dev->gnd_lock);
RETURN(0);
}
dev->gnd_sched_alive = jiffies;
/* we'll retry as fast as possible up to 25% of the limit, then we start
* backing off until our map version changes - indicating we unmapped
* something */
tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
if (likely(dev->gnd_map_attempt == 0) ||
time_after_eq(jiffies, dev->gnd_next_map) ||
last_map_version != dev->gnd_map_version) {
/* if this is our first attempt at mapping set last mapped to current
* jiffies so we can timeout our attempt correctly.
*/
if (dev->gnd_map_attempt == 0)
dev->gnd_last_map = jiffies;
} else {
GNIDBG_TX(D_NET, tx, "waiting for mapping event event to retry", NULL);
spin_unlock(&dev->gnd_lock);
RETURN(0);
}
/* delete the previous timer if it exists */
timer_delete_sync(&dev->gnd_map_timer);
/* stash the last map version to let us know when a good one was seen */
last_map_version = dev->gnd_map_version;
/* we need to to take the lock and continually refresh the head of the list as
* kgnilnd_complete_closed_conn might be nuking stuff and we are cycling the lock
* allowing them to squeeze in */
while (!list_empty(&dev->gnd_map_tx)) {
/* make sure we break out early on quiesce */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
/* always break with lock held - we unlock outside loop */
break;
}
tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
found_work++;
/* sample with lock held, serializing with kgnilnd_complete_closed_conn */
if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
/* if conn is dying, mark tx in tx_ref_table for
* kgnilnd_complete_closed_conn to finish up */
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
found_work++;
/* tx was moved to DYING, get next */
continue;
}
spin_unlock(&dev->gnd_lock);
rc = kgnilnd_send_mapped_tx(tx, 1);
/* We made it! skip error handling.. */
if (rc >= 0) {
/* OK to continue on +ve errors as it won't get seen until
* this function is called again - we operate on a copy of the original
* list and not the live list */
spin_lock(&dev->gnd_lock);
/* reset map attempts back to zero we successfully
* mapped so we can reset our timers */
dev->gnd_map_attempt = 0;
continue;
} else if (rc == -EAGAIN) {
spin_lock(&dev->gnd_lock);
mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
spin_unlock(&dev->gnd_lock);
GOTO(get_out_mapped, rc);
} else if (rc != -ENOMEM) {
/* carp, failure we can't handle */
kgnilnd_tx_done(tx, rc);
spin_lock(&dev->gnd_lock);
/* reset map attempts back to zero we dont know what happened but it
* wasnt a failed mapping
*/
dev->gnd_map_attempt = 0;
continue;
}
/* time to handle the retry cases.. lock so we dont have 2 threads
* mucking with gnd_map_attempt, or gnd_next_map at the same time.
*/
spin_lock(&dev->gnd_lock);
dev->gnd_map_attempt++;
if (dev->gnd_map_attempt < fast_remaps) {
/* do nothing we just want it to go as fast as possible.
* just set gnd_next_map to current jiffies so it will process
* as fast as possible.
*/
dev->gnd_next_map = jiffies;
} else {
/* Retry based on GNILND_MAP_RETRY_RATE */
dev->gnd_next_map = jiffies + GNILND_MAP_RETRY_RATE;
}
/* only log occasionally once we've retried fast_remaps */
log_retrans = (dev->gnd_map_attempt >= fast_remaps) &&
((dev->gnd_map_attempt % fast_remaps) == 0);
log_retrans_level = log_retrans ? D_NETERROR : D_NET;
/* make sure we are not off in the weeds with this tx */
if (time_after(jiffies, dev->gnd_last_map + GNILND_MAP_TIMEOUT)) {
GNIDBG_TX(D_NETERROR, tx,
"giving up on TX, too many retries", NULL);
spin_unlock(&dev->gnd_lock);
if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ ||
tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ_REV) {
kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
-ENOMEM,
tx->tx_putinfo.gnpam_dst_cookie,
tx->tx_msg.gnm_srcnid);
} else {
kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
-ENOMEM,
tx->tx_getinfo.gngm_cookie,
tx->tx_msg.gnm_srcnid);
}
kgnilnd_tx_done(tx, -ENOMEM);
GOTO(get_out_mapped, rc);
} else {
GNIDBG_TX(log_retrans_level, tx,
"transient map failure #%d %d pages/%d bytes phys %u@%u "
"nq_map %d mdd# %d/%d GART %ld",
dev->gnd_map_attempt, tx->tx_phys_npages, tx->tx_nob,
dev->gnd_map_nphys, dev->gnd_map_physnop * PAGE_SIZE,
atomic_read(&dev->gnd_nq_map),
atomic_read(&dev->gnd_n_mdd), atomic_read(&dev->gnd_n_mdd_held),
atomic64_read(&dev->gnd_nbytes_map));
}
/* we need to stop processing the rest of the list, so add it back in */
/* set timer to wake device when we need to schedule this tx */
mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
spin_unlock(&dev->gnd_lock);
GOTO(get_out_mapped, rc);
}
spin_unlock(&dev->gnd_lock);
get_out_mapped:
RETURN(found_work);
}
int
kgnilnd_process_conns(kgn_device_t *dev, unsigned long deadline)
{
int found_work = 0;
int conn_sched;
int intent = 0;
int error_inject = 0;
int rc = 0;
kgn_conn_t *conn;
spin_lock(&dev->gnd_lock);
while (!list_empty(&dev->gnd_ready_conns) && time_before(jiffies, deadline)) {
dev->gnd_sched_alive = jiffies;
error_inject = 0;
rc = 0;
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
/* break with lock held */
break;
}
conn = list_first_entry(&dev->gnd_ready_conns, kgn_conn_t, gnc_schedlist);
list_del_init(&conn->gnc_schedlist);
/*
* Since we are processing conn now, we don't need to be on the delaylist any longer.
*/
if (!list_empty(&conn->gnc_delaylist))
list_del_init(&conn->gnc_delaylist);
spin_unlock(&dev->gnd_lock);
conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_PROCESS);
LASSERTF(conn_sched != GNILND_CONN_IDLE &&
conn_sched != GNILND_CONN_PROCESS,
"conn %px on ready list but in bad state: %d\n",
conn, conn_sched);
CDEBUG(D_INFO, "conn %p@%s for processing\n",
conn, kgnilnd_conn_state2str(conn));
found_work++;
set_mb(conn->gnc_last_sched_do, jiffies);
if (kgnilnd_check_conn_fail_loc(dev, conn, &intent)) {
/* based on intent see if we should run again. */
rc = kgnilnd_schedule_process_conn(conn, intent);
error_inject = 1;
/* drop ref from gnd_ready_conns */
if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
down_write(&dev->gnd_conn_sem);
kgnilnd_conn_decref(conn);
up_write(&dev->gnd_conn_sem);
} else if (rc != 1) {
kgnilnd_conn_decref(conn);
}
/* clear this so that scheduler thread doesn't spin */
found_work = 0;
/* break with lock held... */
spin_lock(&dev->gnd_lock);
break;
}
if (unlikely(conn->gnc_state == GNILND_CONN_CLOSED)) {
down_write(&dev->gnd_conn_sem);
/* CONN_CLOSED set in procces_fmaq when CLOSE is sent */
if (unlikely(atomic_read(&conn->gnc_tx_in_use))) {
/* If there are tx's currently in use in another
* thread we dont want to complete the close
* yet. Cycle this conn back through
* the scheduler. */
kgnilnd_schedule_conn(conn);
} else {
kgnilnd_complete_closed_conn(conn);
}
up_write(&dev->gnd_conn_sem);
} else if (unlikely(conn->gnc_state == GNILND_CONN_DESTROY_EP)) {
/* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
/* serialize SMSG CQs with ep_bind and smsg_release */
down_write(&dev->gnd_conn_sem);
kgnilnd_destroy_conn_ep(conn);
up_write(&dev->gnd_conn_sem);
} else if (unlikely(conn->gnc_state == GNILND_CONN_CLOSING)) {
/* if we need to do some CLOSE sending, etc done here do it */
down_write(&dev->gnd_conn_sem);
kgnilnd_send_conn_close(conn);
kgnilnd_check_fma_rx(conn);
up_write(&dev->gnd_conn_sem);
} else if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) == 0) {
/* start moving traffic if the old conns are cleared out */
down_read(&dev->gnd_conn_sem);
kgnilnd_check_fma_rx(conn);
kgnilnd_process_fmaq(conn);
up_read(&dev->gnd_conn_sem);
}
rc = kgnilnd_schedule_process_conn(conn, 0);
/* drop ref from gnd_ready_conns */
if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
down_write(&dev->gnd_conn_sem);
kgnilnd_conn_decref(conn);
up_write(&dev->gnd_conn_sem);
} else if (rc != 1) {
kgnilnd_conn_decref(conn);
}
/* check list again with lock held */
spin_lock(&dev->gnd_lock);
}
/* If we are short circuiting due to timing we want to be scheduled
* as soon as possible.
*/
if (!list_empty(&dev->gnd_ready_conns) && !error_inject)
found_work++;
spin_unlock(&dev->gnd_lock);
RETURN(found_work);
}
int
kgnilnd_scheduler(void *arg)
{
int threadno = (long)arg;
kgn_device_t *dev;
int busy_loops = 0;
unsigned long deadline = 0;
DEFINE_WAIT(wait);
dev = &kgnilnd_data.kgn_devices[(threadno + 1) % kgnilnd_data.kgn_ndevs];
/* all gnilnd threads need to run fairly urgently */
set_user_nice(current, *kgnilnd_tunables.kgn_sched_nice);
deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
while (!kgnilnd_data.kgn_shutdown) {
int found_work = 0;
/* Safe: kgn_shutdown only set when quiescent */
/* to quiesce or to not quiesce, that is the question */
if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
KGNILND_SPIN_QUIESCE;
}
/* tracking for when thread goes AWOL */
dev->gnd_sched_alive = jiffies;
CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_SCHED_DEADLINE,
(*kgnilnd_tunables.kgn_sched_timeout + 1));
/* let folks know we are up and kicking
* - they can use this for latency savings, etc
* - only change if IRQ, if IDLE leave alone as that
* schedule_device calls to put us back to IRQ */
(void)cmpxchg(&dev->gnd_ready, GNILND_DEV_IRQ, GNILND_DEV_LOOP);
down_read(&dev->gnd_conn_sem);
/* always check these - they are super low cost */
found_work += kgnilnd_check_fma_send_cq(dev);
found_work += kgnilnd_check_fma_rcv_cq(dev);
/* rdma CQ doesn't care about eps */
found_work += kgnilnd_check_rdma_cq(dev);
/* move some RDMA ? */
found_work += kgnilnd_process_rdmaq(dev);
/* map some pending RDMA requests ? */
found_work += kgnilnd_process_mapped_tx(dev);
/* the EP for a conn is not destroyed until all the references
* to it are gone, so these checks should be safe
* even if run in parallel with the CQ checking functions
* _AND_ a thread that processes the CLOSED->DONE
* transistion
* ...should.... */
up_read(&dev->gnd_conn_sem);
/* process all conns ready now */
found_work += kgnilnd_process_conns(dev, deadline);
/* do an eager check to avoid the IRQ disabling in
* prepare_to_wait and friends */
if (found_work &&
(busy_loops++ < *kgnilnd_tunables.kgn_loops) &&
time_before(jiffies, deadline)) {
found_work = 0;
if ((busy_loops % 10) == 0) {
/* tickle heartbeat and watchdog to ensure our
* piggishness doesn't turn into heartbeat failure */
touch_nmi_watchdog();
kgnilnd_hw_hb();
}
continue;
}
/* if we got here, found_work was zero or busy_loops means we
* need to take a break. We'll clear gnd_ready but we'll check
* one last time if there is an IRQ that needs processing */
prepare_to_wait(&dev->gnd_waitq, &wait, TASK_INTERRUPTIBLE);
/* the first time this will go LOOP -> IDLE and let us do one final check
* during which we might get an IRQ, then IDLE->IDLE and schedule()
* - this might allow other threads to block us for a bit if they
* try to get the mutex, but that is good as we'd need to wake
* up soon to handle the CQ or other processing anyways */
found_work += xchg(&dev->gnd_ready, GNILND_DEV_IDLE);
if ((busy_loops >= *kgnilnd_tunables.kgn_loops) ||
time_after_eq(jiffies, deadline)) {
CDEBUG(D_INFO,
"yeilding: found_work %d busy_loops %d\n",
found_work, busy_loops);
busy_loops = 0;
/* use yield if we are bailing due to busy_loops
* - this will ensure we wake up soonish. This closes
* a race with kgnilnd_device_callback - where it'd
* not call wake_up() because gnd_ready == 1, but then
* we come down and schedule() because of busy_loops.
* We'd not be woken up until something poked our waitq
* again. yield() ensures we wake up without another
* waitq poke in that case */
atomic_inc(&dev->gnd_n_yield);
kgnilnd_data.kgn_last_condresched = jiffies;
yield();
CDEBUG(D_INFO, "awake after yeild\n");
deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
} else if (found_work == GNILND_DEV_IDLE) {
/* busy_loops is low and there is nothing to do,
* go to sleep and wait for a waitq poke */
CDEBUG(D_INFO,
"scheduling: found_work %d busy_loops %d\n",
found_work, busy_loops);
atomic_inc(&dev->gnd_n_schedule);
kgnilnd_data.kgn_last_scheduled = jiffies;
schedule();
CDEBUG(D_INFO, "awake after schedule\n");
deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
}
finish_wait(&dev->gnd_waitq, &wait);
}
kgnilnd_thread_fini();
return 0;
}
