Viewing: gnilnd.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2012 Cray, Inc.
*
* Copyright (c) 2013, 2017, Intel Corporation.
*/
/* This file is part of Lustre, http://www.lustre.org.
*
* Author: Nic Henke <nic@cray.com>
* Author: James Shimek <jshimek@cray.com>
*/
#include "gnilnd.h"
static int
kgnilnd_tun_defaults(struct lnet_lnd_tunables *lnd_tunables,
struct lnet_ioctl_config_lnd_cmn_tunables *cmn)
{
struct lnet_ioctl_config_gnilnd_tunables *tunables;
/* sync to latest module settings */
tunables = &lnd_tunables->lnd_tun_u.lnd_gni;
tunables->lnd_version = CURRENT_LND_VERSION;
tunables->lnd_timeout = kgnilnd_timeout();
if (cmn->lct_peer_timeout == -1)
cmn->lct_peer_timeout = *kgnilnd_tunables.kgn_peer_timeout;
if (cmn->lct_max_tx_credits == -1)
cmn->lct_max_tx_credits = *kgnilnd_tunables.kgn_credits;
if (cmn->lct_peer_tx_credits == -1)
cmn->lct_peer_tx_credits = *kgnilnd_tunables.kgn_peer_credits;
if (cmn->lct_peer_tx_credits > cmn->lct_max_tx_credits)
cmn->lct_peer_tx_credits = cmn->lct_max_tx_credits;
/* gnilnd doesn't set lct_peer_rtr_credits */
return 0;
}
static const struct ln_key_list kgnilnd_tunables_keys = {
.lkl_maxattr = LNET_NET_GNILND_TUNABLES_ATTR_MAX,
.lkl_list = {
[LNET_NET_GNILND_TUNABLES_ATTR_LND_TIMEOUT] = {
.lkp_value = "timeout",
.lkp_data_type = NLA_S32,
},
},
};
static int
kgnilnd_nl_get(int cmd, struct sk_buff *msg, int type, void *data,
bool export_backup)
{
struct lnet_ni *ni = data;
if (!ni || !msg)
return -EINVAL;
if (cmd != LNET_CMD_NETS || type != LNET_NET_LOCAL_NI_ATTR_LND_TUNABLES)
return -EOPNOTSUPP;
if (!export_backup)
nla_put_u32(msg, LNET_NET_GNILND_TUNABLES_ATTR_LND_TIMEOUT,
kgnilnd_timeout());
return 0;
}
static int
kgnilnd_nl_set(int cmd, struct nlattr *attr, int type, void *data)
{
if (cmd != LNET_CMD_NETS)
return -EOPNOTSUPP;
return 0;
}
/* Primary entry points from LNET. There are no guarantees against reentrance. */
const struct lnet_lnd the_kgnilnd = {
.lnd_type = GNILND,
.lnd_startup = kgnilnd_startup,
.lnd_shutdown = kgnilnd_shutdown,
.lnd_ctl = kgnilnd_ctl,
.lnd_send = kgnilnd_send,
.lnd_recv = kgnilnd_recv,
.lnd_eager_recv = kgnilnd_eager_recv,
.lnd_tun_defaults = kgnilnd_tun_defaults,
.lnd_nl_get = kgnilnd_nl_get,
.lnd_nl_set = kgnilnd_nl_set,
.lnd_get_timeout = kgnilnd_timeout,
};
kgn_data_t kgnilnd_data;
int
kgnilnd_thread_start(int(*fn)(void *arg), void *arg, char *name, int id)
{
struct task_struct *thrd;
thrd = kthread_run(fn, arg, "%s_%02d", name, id);
if (IS_ERR(thrd))
return PTR_ERR(thrd);
atomic_inc(&kgnilnd_data.kgn_nthreads);
return 0;
}
/* bind scheduler threads to cpus */
int
kgnilnd_start_sd_threads(void)
{
int cpu;
int i = 0;
struct task_struct *task;
for_each_online_cpu(cpu) {
/* don't bind to cpu 0 - all interrupts are processed here */
if (cpu == 0)
continue;
task = kthread_create(kgnilnd_scheduler, (void *)((long)i),
"%s_%02d", "kgnilnd_sd", i);
if (!IS_ERR(task)) {
kthread_bind(task, cpu);
wake_up_process(task);
} else {
CERROR("Can't spawn gnilnd scheduler[%d] %ld\n", i,
PTR_ERR(task));
return PTR_ERR(task);
}
atomic_inc(&kgnilnd_data.kgn_nthreads);
if (++i >= *kgnilnd_tunables.kgn_sched_threads) {
break;
}
}
return 0;
}
/* needs write_lock on kgn_peer_conn_lock */
int
kgnilnd_close_stale_conns_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
{
kgn_conn_t *conn, *cnxt;
int loopback;
int count = 0;
loopback = (peer->gnp_nid ==
lnet_nid_to_nid4(&peer->gnp_net->gnn_ni->ni_nid));
list_for_each_entry_safe(conn, cnxt, &peer->gnp_conns, gnc_list) {
if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
continue;
if (conn == newconn)
continue;
if (conn->gnc_device != newconn->gnc_device)
continue;
/* This is a two connection loopback - one talking to the other */
if (loopback &&
newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
newconn->gnc_peer_connstamp == conn->gnc_my_connstamp) {
CDEBUG(D_NET, "skipping prune of %p, "
"loopback and matching stamps"
" connstamp %llu(%llu)"
" peerstamp %llu(%llu)\n",
conn, newconn->gnc_my_connstamp,
conn->gnc_peer_connstamp,
newconn->gnc_peer_connstamp,
conn->gnc_my_connstamp);
continue;
}
if (conn->gnc_peerstamp != newconn->gnc_peerstamp) {
LASSERTF(conn->gnc_peerstamp < newconn->gnc_peerstamp,
"conn 0x%p peerstamp %llu >= "
"newconn 0x%p peerstamp %llu\n",
conn, conn->gnc_peerstamp,
newconn, newconn->gnc_peerstamp);
CDEBUG(D_NET, "Closing stale conn nid: %s "
" peerstamp:%#llx(%#llx)\n",
libcfs_nid2str(peer->gnp_nid),
conn->gnc_peerstamp, newconn->gnc_peerstamp);
} else {
LASSERTF(conn->gnc_peer_connstamp < newconn->gnc_peer_connstamp,
"conn 0x%p peer_connstamp %llu >= "
"newconn 0x%p peer_connstamp %llu\n",
conn, conn->gnc_peer_connstamp,
newconn, newconn->gnc_peer_connstamp);
CDEBUG(D_NET, "Closing stale conn nid: %s"
" connstamp:%llu(%llu)\n",
libcfs_nid2str(peer->gnp_nid),
conn->gnc_peer_connstamp, newconn->gnc_peer_connstamp);
}
count++;
kgnilnd_close_conn_locked(conn, -ESTALE);
}
if (count != 0) {
CWARN("Closed %d stale conns to %s\n", count, libcfs_nid2str(peer->gnp_nid));
}
RETURN(count);
}
int
kgnilnd_conn_isdup_locked(kgn_peer_t *peer, kgn_conn_t *newconn)
{
kgn_conn_t *conn;
int loopback;
ENTRY;
loopback = (peer->gnp_nid ==
lnet_nid_to_nid4(&peer->gnp_net->gnn_ni->ni_nid));
list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
CDEBUG(D_NET, "checking conn 0x%p for peer %s"
" lo %d new %llu existing %llu"
" new peer %llu existing peer %llu"
" new dev %p existing dev %p\n",
conn, libcfs_nid2str(peer->gnp_nid),
loopback,
newconn->gnc_peerstamp, conn->gnc_peerstamp,
newconn->gnc_peer_connstamp, conn->gnc_peer_connstamp,
newconn->gnc_device, conn->gnc_device);
/* conn is in the process of closing */
if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
continue;
/* 'newconn' is from an earlier version of 'peer'!!! */
if (newconn->gnc_peerstamp < conn->gnc_peerstamp)
RETURN(1);
/* 'conn' is from an earlier version of 'peer': it will be
* removed when we cull stale conns later on... */
if (newconn->gnc_peerstamp > conn->gnc_peerstamp)
continue;
/* Different devices are OK */
if (conn->gnc_device != newconn->gnc_device)
continue;
/* It's me connecting to myself */
if (loopback &&
newconn->gnc_my_connstamp == conn->gnc_peer_connstamp &&
newconn->gnc_peer_connstamp == conn->gnc_my_connstamp)
continue;
/* 'newconn' is an earlier connection from 'peer'!!! */
if (newconn->gnc_peer_connstamp < conn->gnc_peer_connstamp)
RETURN(2);
/* 'conn' is an earlier connection from 'peer': it will be
* removed when we cull stale conns later on... */
if (newconn->gnc_peer_connstamp > conn->gnc_peer_connstamp)
continue;
/* 'newconn' has the SAME connection stamp; 'peer' isn't
* playing the game... */
RETURN(3);
}
RETURN(0);
}
int
kgnilnd_create_conn(kgn_conn_t **connp, kgn_device_t *dev)
{
kgn_conn_t *conn;
gni_return_t rrc;
int rc = 0;
LASSERT (!in_interrupt());
atomic_inc(&kgnilnd_data.kgn_nconns);
/* divide by 2 to allow for complete reset and immediate reconnect */
if (atomic_read(&kgnilnd_data.kgn_nconns) >= GNILND_MAX_CQID/2) {
CERROR("Too many conn are live: %d > %d\n",
atomic_read(&kgnilnd_data.kgn_nconns), GNILND_MAX_CQID/2);
atomic_dec(&kgnilnd_data.kgn_nconns);
return -E2BIG;
}
LIBCFS_ALLOC(conn, sizeof(*conn));
if (conn == NULL) {
atomic_dec(&kgnilnd_data.kgn_nconns);
return -ENOMEM;
}
conn->gnc_tx_ref_table =
kgnilnd_vzalloc(GNILND_MAX_MSG_ID * sizeof(void *));
if (conn->gnc_tx_ref_table == NULL) {
CERROR("Can't allocate conn tx_ref_table\n");
GOTO(failed, rc = -ENOMEM);
}
mutex_init(&conn->gnc_smsg_mutex);
mutex_init(&conn->gnc_rdma_mutex);
atomic_set(&conn->gnc_refcount, 1);
atomic_set(&conn->gnc_reaper_noop, 0);
atomic_set(&conn->gnc_sched_noop, 0);
atomic_set(&conn->gnc_tx_in_use, 0);
INIT_LIST_HEAD(&conn->gnc_list);
INIT_LIST_HEAD(&conn->gnc_hashlist);
INIT_LIST_HEAD(&conn->gnc_schedlist);
INIT_LIST_HEAD(&conn->gnc_fmaq);
INIT_LIST_HEAD(&conn->gnc_mdd_list);
INIT_LIST_HEAD(&conn->gnc_delaylist);
spin_lock_init(&conn->gnc_list_lock);
spin_lock_init(&conn->gnc_tx_lock);
conn->gnc_magic = GNILND_CONN_MAGIC;
/* set tx id to nearly the end to make sure we find wrapping
* issues soon */
conn->gnc_next_tx = (int) GNILND_MAX_MSG_ID - 10;
/* if this fails, we have conflicts and MAX_TX is too large */
BUILD_BUG_ON(GNILND_MAX_MSG_ID >= GNILND_MSGID_CLOSE);
/* get a new unique CQ id for this conn */
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn->gnc_my_connstamp = kgnilnd_data.kgn_connstamp++;
conn->gnc_cqid = kgnilnd_get_cqid_locked();
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
if (conn->gnc_cqid == 0) {
CERROR("Could not allocate unique CQ ID for conn 0x%p\n", conn);
GOTO(failed, rc = -E2BIG);
}
CDEBUG(D_NET, "alloc cqid %u for conn 0x%p\n",
conn->gnc_cqid, conn);
/* need to be set before gnc_ephandle to allow kgnilnd_destroy_conn_ep to
* check context */
conn->gnc_device = dev;
conn->gnc_timeout = max(*kgnilnd_tunables.kgn_timeout,
GNILND_MIN_TIMEOUT);
kgnilnd_update_reaper_timeout(conn->gnc_timeout);
/* this is the ep_handle for doing SMSG & BTE */
mutex_lock(&dev->gnd_cq_mutex);
rrc = kgnilnd_ep_create(dev->gnd_handle, dev->gnd_snd_fma_cqh,
&conn->gnc_ephandle);
mutex_unlock(&dev->gnd_cq_mutex);
if (rrc != GNI_RC_SUCCESS)
GOTO(failed, rc = -ENETDOWN);
CDEBUG(D_NET, "created conn 0x%p ep_hndl 0x%p\n",
conn, conn->gnc_ephandle);
/* add ref for EP canceling */
kgnilnd_conn_addref(conn);
atomic_inc(&dev->gnd_neps);
*connp = conn;
return 0;
failed:
atomic_dec(&kgnilnd_data.kgn_nconns);
kgnilnd_vfree(conn->gnc_tx_ref_table,
GNILND_MAX_MSG_ID * sizeof(void *));
LIBCFS_FREE(conn, sizeof(*conn));
return rc;
}
/* needs to be called with kgn_peer_conn_lock held (read or write) */
kgn_conn_t *
kgnilnd_find_conn_locked(kgn_peer_t *peer)
{
kgn_conn_t *conn = NULL;
/* if we are in reset, this conn is going to die soon */
if (unlikely(kgnilnd_data.kgn_in_reset)) {
RETURN(NULL);
}
/* just return the first ESTABLISHED connection */
list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
/* kgnilnd_finish_connect doesn't put connections on the
* peer list until they are actually established */
LASSERTF(conn->gnc_state >= GNILND_CONN_ESTABLISHED,
"found conn %px state %s on peer %px (%s)\n",
conn, kgnilnd_conn_state2str(conn), peer,
libcfs_nid2str(peer->gnp_nid));
if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
continue;
RETURN(conn);
}
RETURN(NULL);
}
/* needs write_lock on kgn_peer_conn_lock held */
kgn_conn_t *
kgnilnd_find_or_create_conn_locked(kgn_peer_t *peer) {
kgn_device_t *dev = peer->gnp_net->gnn_dev;
kgn_conn_t *conn;
conn = kgnilnd_find_conn_locked(peer);
if (conn != NULL) {
return conn;
}
/* if the peer was previously connecting, check if we should
* trigger another connection attempt yet. */
if (time_before(jiffies, peer->gnp_reconnect_time)) {
return NULL;
}
/* This check prevents us from creating a new connection to a peer while we are
* still in the process of closing an existing connection to the peer.
*/
list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
if (conn->gnc_ephandle != NULL) {
CDEBUG(D_NET, "Not connecting non-null ephandle found peer 0x%p->%s\n", peer,
libcfs_nid2str(peer->gnp_nid));
return NULL;
}
}
if (peer->gnp_connecting != GNILND_PEER_IDLE) {
/* if we are not connecting, fire up a new connection */
/* or if we are anything but IDLE DONT start a new connection */
return NULL;
}
CDEBUG(D_NET, "starting connect to %s\n",
libcfs_nid2str(peer->gnp_nid));
peer->gnp_connecting = GNILND_PEER_CONNECT;
kgnilnd_peer_addref(peer); /* extra ref for connd */
spin_lock(&dev->gnd_connd_lock);
list_add_tail(&peer->gnp_connd_list, &dev->gnd_connd_peers);
spin_unlock(&dev->gnd_connd_lock);
kgnilnd_schedule_dgram(dev);
CDEBUG(D_NETTRACE, "scheduling new connect\n");
return NULL;
}
/* Caller is responsible for deciding if/when to call this */
void
kgnilnd_destroy_conn_ep(kgn_conn_t *conn)
{
gni_return_t rrc;
gni_ep_handle_t tmp_ep;
/* only if we actually initialized it,
* then set NULL to tell kgnilnd_destroy_conn to leave it alone */
tmp_ep = xchg(&conn->gnc_ephandle, NULL);
if (tmp_ep != NULL) {
/* we never re-use the EP, so unbind is not needed */
mutex_lock(&conn->gnc_device->gnd_cq_mutex);
rrc = kgnilnd_ep_destroy(tmp_ep);
mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
/* if this fails, it could hork up kgni smsg retransmit and others
* since we could free the SMSG mbox memory, etc. */
LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d conn 0x%p ep 0x%p\n",
rrc, conn, conn->gnc_ephandle);
atomic_dec(&conn->gnc_device->gnd_neps);
/* clear out count added in kgnilnd_close_conn_locked
* conn will have a peer once it hits finish_connect, where it
* is the first spot we'll mark it ESTABLISHED as well */
if (conn->gnc_peer) {
kgnilnd_admin_decref(conn->gnc_peer->gnp_dirty_eps);
}
/* drop ref for EP */
kgnilnd_conn_decref(conn);
}
}
void
kgnilnd_destroy_conn(kgn_conn_t *conn)
{
LASSERTF(!in_interrupt() &&
!conn->gnc_scheduled &&
!conn->gnc_in_purgatory &&
conn->gnc_ephandle == NULL &&
list_empty(&conn->gnc_list) &&
list_empty(&conn->gnc_hashlist) &&
list_empty(&conn->gnc_schedlist) &&
list_empty(&conn->gnc_mdd_list) &&
list_empty(&conn->gnc_delaylist) &&
conn->gnc_magic == GNILND_CONN_MAGIC,
"conn 0x%p->%s IRQ %d sched %d purg %d ep 0x%p Mg %d lists %d/%d/%d/%d/%d\n",
conn, conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
: "<?>",
!!in_interrupt(), conn->gnc_scheduled,
conn->gnc_in_purgatory,
conn->gnc_ephandle,
conn->gnc_magic,
list_empty(&conn->gnc_list),
list_empty(&conn->gnc_hashlist),
list_empty(&conn->gnc_schedlist),
list_empty(&conn->gnc_mdd_list),
list_empty(&conn->gnc_delaylist));
/* Tripping these is especially bad, as it means we have items on the
* lists that didn't keep their refcount on the connection - or
* somebody evil released their own */
LASSERTF(list_empty(&conn->gnc_fmaq) &&
atomic_read(&conn->gnc_nlive_fma) == 0 &&
atomic_read(&conn->gnc_nlive_rdma) == 0,
"conn 0x%p fmaq %d@0x%p nfma %d nrdma %d\n",
conn, kgnilnd_count_list(&conn->gnc_fmaq), &conn->gnc_fmaq,
atomic_read(&conn->gnc_nlive_fma), atomic_read(&conn->gnc_nlive_rdma));
CDEBUG(D_NET, "destroying conn %p ephandle %p error %d\n",
conn, conn->gnc_ephandle, conn->gnc_error);
/* We are freeing this memory remove the magic value from the connection */
conn->gnc_magic = 0;
/* if there is an FMA blk left here, we'll tear it down */
if (conn->gnc_fma_blk) {
if (conn->gnc_peer) {
kgn_mbox_info_t *mbox;
mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
mbox->mbx_prev_nid = conn->gnc_peer->gnp_nid;
}
kgnilnd_release_mbox(conn, 0);
}
if (conn->gnc_peer != NULL)
kgnilnd_peer_decref(conn->gnc_peer);
if (conn->gnc_tx_ref_table != NULL) {
kgnilnd_vfree(conn->gnc_tx_ref_table,
GNILND_MAX_MSG_ID * sizeof(void *));
}
LIBCFS_FREE(conn, sizeof(*conn));
atomic_dec(&kgnilnd_data.kgn_nconns);
}
/* peer_alive and peer_notify done in the style of the o2iblnd */
void
kgnilnd_peer_alive(kgn_peer_t *peer)
{
time64_t now = ktime_get_seconds();
set_mb(peer->gnp_last_alive, now);
}
void
kgnilnd_peer_notify(kgn_peer_t *peer, int error, int alive)
{
int tell_lnet = 0;
int nnets = 0;
int rc;
int i, j;
kgn_conn_t *conn;
kgn_net_t **nets;
kgn_net_t *net;
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DONT_NOTIFY))
return;
/* Tell LNet we are giving ups on this peer - but only
* if it isn't already reconnected or trying to reconnect */
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
/* use kgnilnd_find_conn_locked to avoid any conns in the process of being nuked
*
* don't tell LNet if we are in reset - we assume that everyone will be able to
* reconnect just fine
*/
conn = kgnilnd_find_conn_locked(peer);
CDEBUG(D_NETTRACE, "peer 0x%p->%s ting %d conn 0x%p, rst %d error %d\n",
peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting, conn,
kgnilnd_data.kgn_in_reset, error);
if (((peer->gnp_connecting == GNILND_PEER_IDLE) &&
(conn == NULL) &&
(!kgnilnd_data.kgn_in_reset) &&
(!kgnilnd_conn_clean_errno(error))) || alive) {
tell_lnet = 1;
}
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
if (!tell_lnet) {
/* short circuit if we dont need to notify Lnet */
return;
}
rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
if (rc) {
/* dont do this if this fails since LNET is in shutdown or something else
*/
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
list_for_each_entry(net, &kgnilnd_data.kgn_nets[i], gnn_list) {
/* if gnn_shutdown set for any net shutdown is in progress just return */
if (net->gnn_shutdown) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
return;
}
nnets++;
}
}
if (nnets == 0) {
/* shutdown in progress most likely */
up_read(&kgnilnd_data.kgn_net_rw_sem);
return;
}
CFS_ALLOC_PTR_ARRAY(nets, nnets);
if (nets == NULL) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
CERROR("Failed to allocate nets[%d]\n", nnets);
return;
}
j = 0;
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
list_for_each_entry(net, &kgnilnd_data.kgn_nets[i], gnn_list) {
nets[j] = net;
kgnilnd_net_addref(net);
j++;
}
}
up_read(&kgnilnd_data.kgn_net_rw_sem);
for (i = 0; i < nnets; i++) {
struct lnet_nid peer_nid;
net = nets[i];
lnet_nid4_to_nid(kgnilnd_lnd2lnetnid(
lnet_nid_to_nid4(&net->gnn_ni->ni_nid),
peer->gnp_nid),
&peer_nid);
CDEBUG(D_NET, "peer 0x%p->%s last_alive %lld (%llds ago)\n",
peer, libcfs_nidstr(&peer_nid),
peer->gnp_last_alive,
ktime_get_seconds() - peer->gnp_last_alive);
lnet_notify(net->gnn_ni, &peer_nid, alive, true,
peer->gnp_last_alive);
kgnilnd_net_decref(net);
}
CFS_FREE_PTR_ARRAY(nets, nnets);
}
}
/* need write_lock on kgn_peer_conn_lock */
void
kgnilnd_close_conn_locked(kgn_conn_t *conn, int error)
{
kgn_peer_t *peer = conn->gnc_peer;
ENTRY;
LASSERT(!in_interrupt());
/* store error for tx completion */
conn->gnc_error = error;
peer->gnp_last_errno = error;
/* use real error from peer if possible */
if (error == -ECONNRESET) {
error = conn->gnc_peer_error;
}
/* if we NETERROR, make sure it is rate limited */
if (!kgnilnd_conn_clean_errno(error) &&
peer->gnp_state != GNILND_PEER_DOWN) {
CNETERR("closing conn to %s: error %d\n",
libcfs_nid2str(peer->gnp_nid), error);
} else {
CDEBUG(D_NET, "closing conn to %s: error %d\n",
libcfs_nid2str(peer->gnp_nid), error);
}
LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
"conn %px to %s with bogus state %s\n", conn,
libcfs_nid2str(conn->gnc_peer->gnp_nid),
kgnilnd_conn_state2str(conn));
LASSERT(!list_empty(&conn->gnc_hashlist));
LASSERT(!list_empty(&conn->gnc_list));
/* mark peer count here so any place the EP gets destroyed will
* open up the peer count so that a new ESTABLISHED conn is then free
* to send new messages -- sending before the previous EPs are destroyed
* could end up with messages on the network for the old conn _after_
* the new conn and break the mbox safety protocol */
kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
/* Remove from conn hash table: no new callbacks */
list_del_init(&conn->gnc_hashlist);
kgnilnd_data.kgn_conn_version++;
kgnilnd_conn_decref(conn);
/* if we are in reset, go right to CLOSED as there is no scheduler
* thread to move from CLOSING to CLOSED */
if (unlikely(kgnilnd_data.kgn_in_reset)) {
conn->gnc_state = GNILND_CONN_CLOSED;
} else {
conn->gnc_state = GNILND_CONN_CLOSING;
}
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
msleep_interruptible(MSEC_PER_SEC);
}
/* leave on peer->gnp_conns to make sure we don't let the reaper
* or others try to unlink this peer until the conn is fully
* processed for closing */
if (kgnilnd_check_purgatory_conn(conn)) {
kgnilnd_add_purgatory_locked(conn, conn->gnc_peer);
}
/* Reset RX timeout to ensure we wait for an incoming CLOSE
* for the full timeout. If we get a CLOSE we know the
* peer has stopped all RDMA. Otherwise if we wait for
* the full timeout we can also be sure all RDMA has stopped. */
conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
mb();
/* schedule sending CLOSE - if we are in quiesce, this adds to
* gnd_ready_conns and allows us to find it in quiesce processing */
kgnilnd_schedule_conn(conn);
EXIT;
}
void
kgnilnd_close_conn(kgn_conn_t *conn, int error)
{
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
/* need to check the state here - this call is racy and we don't
* know the state until after the lock is grabbed */
if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
kgnilnd_close_conn_locked(conn, error);
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
}
void
kgnilnd_complete_closed_conn(kgn_conn_t *conn)
{
LIST_HEAD (sinners);
kgn_tx_t *tx, *txn;
int nlive = 0;
int nrdma = 0;
int nq_rdma = 0;
int logmsg;
ENTRY;
/* Dump log on cksum error - wait until complete phase to let
* RX of error happen */
if (*kgnilnd_tunables.kgn_checksum_dump &&
(conn != NULL && conn->gnc_peer_error == -ENOKEY)) {
libcfs_debug_dumplog();
}
/* _CLOSED set in kgnilnd_process_fmaq once we decide to
* send the CLOSE or not */
LASSERTF(conn->gnc_state == GNILND_CONN_CLOSED,
"conn 0x%p->%s with bad state %s\n",
conn, conn->gnc_peer ?
libcfs_nid2str(conn->gnc_peer->gnp_nid) :
"<?>",
kgnilnd_conn_state2str(conn));
LASSERT(list_empty(&conn->gnc_hashlist));
/* We shouldnt be on the delay list, the conn can
* get added to this list during a retransmit, and retransmits
* only occur within scheduler threads.
*/
LASSERT(list_empty(&conn->gnc_delaylist));
/* we've sent the close, start nuking */
if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SCHEDULE_COMPLETE))
kgnilnd_schedule_conn(conn);
if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
"done, Attempting to recover conn 0x%p "
"scheduled %d function: %s line: %d\n", conn,
conn->gnc_scheduled, conn->gnc_sched_caller,
conn->gnc_sched_line);
RETURN_EXIT;
}
/* we don't use lists to track things that we can get out of the
* tx_ref table... */
/* need to hold locks for tx_list_state, sampling it is too racy:
* - the lock actually protects tx != NULL, but we can't take the proper
* lock until we check tx_list_state, which would be too late and
* we could have the TX change under us.
* gnd_rdmaq_lock and gnd_lock and not used together, so taking both
* should be fine */
spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
spin_lock(&conn->gnc_device->gnd_lock);
for (nrdma = 0; nrdma < GNILND_MAX_MSG_ID; nrdma++) {
tx = conn->gnc_tx_ref_table[nrdma];
if (tx != NULL) {
/* only print the first error and if not CLOSE, we often don't see
* CQ events for that by the time we get here... and really don't care */
if (nlive || tx->tx_msg.gnm_type == GNILND_MSG_CLOSE)
tx->tx_state |= GNILND_TX_QUIET_ERROR;
nlive++;
GNIDBG_TX(D_NET, tx, "cleaning up on close, nlive %d", nlive);
/* don't worry about gnc_lock here as nobody else should be
* touching this conn */
kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
list_add_tail(&tx->tx_list, &sinners);
}
}
spin_unlock(&conn->gnc_device->gnd_lock);
spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
/* nobody should have marked this as needing scheduling after
* we called close - so only ref should be us handling it */
if (conn->gnc_scheduled != GNILND_CONN_PROCESS) {
CDEBUG(D_NETERROR, "Error someone scheduled us after we were "
"done, Attempting to recover conn 0x%p "
"scheduled %d function %s line: %d\n", conn,
conn->gnc_scheduled, conn->gnc_sched_caller,
conn->gnc_sched_line);
}
/* now reset a few to actual counters... */
nrdma = atomic_read(&conn->gnc_nlive_rdma);
nq_rdma = atomic_read(&conn->gnc_nq_rdma);
if (!list_empty(&sinners)) {
list_for_each_entry_safe(tx, txn, &sinners, tx_list) {
/* clear tx_list to make tx_add_list_locked happy */
list_del_init(&tx->tx_list);
/* The error codes determine if we hold onto the MDD */
kgnilnd_tx_done(tx, conn->gnc_error);
}
}
logmsg = (nlive + nrdma + nq_rdma);
if (logmsg) {
int level = conn->gnc_peer->gnp_state == GNILND_PEER_UP ?
D_NETERROR : D_NET;
CDEBUG(level, "Closed conn 0x%p->%s (errno %d,"
" peer errno %d): canceled %d TX, %d/%d RDMA\n",
conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
conn->gnc_error, conn->gnc_peer_error,
nlive, nq_rdma, nrdma);
}
kgnilnd_destroy_conn_ep(conn);
/* Bug 765042 - race this with completing a new conn to same peer - we need
* finish_connect to detach purgatory before we can do it ourselves here */
CFS_RACE(CFS_FAIL_GNI_FINISH_PURG);
/* now it is safe to remove from peer list - anyone looking at
* gnp_conns now is free to unlink if not on purgatory */
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn->gnc_state = GNILND_CONN_DONE;
/* Decrement counter if we are marked by del_conn_or_peers for closing
*/
if (conn->gnc_needs_closing)
kgnilnd_admin_decref(kgnilnd_data.kgn_npending_conns);
/* Remove from peer's list of valid connections if its not in purgatory */
if (!conn->gnc_in_purgatory) {
list_del_init(&conn->gnc_list);
/* Lose peers reference on the conn */
kgnilnd_conn_decref(conn);
}
/* NB - only unlinking if we set pending in del_peer_locked from admin or
* shutdown */
if (kgnilnd_peer_active(conn->gnc_peer) &&
conn->gnc_peer->gnp_pending_unlink &&
kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
kgnilnd_unlink_peer_locked(conn->gnc_peer);
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* I'm telling Mommy! - use peer_error if they initiated close */
kgnilnd_peer_notify(conn->gnc_peer,
conn->gnc_error == -ECONNRESET ?
conn->gnc_peer_error : conn->gnc_error, 0);
EXIT;
}
int
kgnilnd_set_conn_params(kgn_dgram_t *dgram)
{
kgn_conn_t *conn = dgram->gndg_conn;
kgn_connreq_t *connreq = &dgram->gndg_conn_in;
kgn_gniparams_t *rem_param = &connreq->gncr_gnparams;
gni_return_t rrc;
int rc = 0;
gni_smsg_attr_t *remote = &connreq->gncr_gnparams.gnpr_smsg_attr;
/* set timeout vals in conn early so we can use them for the NAK */
/* use max of the requested and our timeout, peer will do the same */
conn->gnc_timeout = max(conn->gnc_timeout, connreq->gncr_timeout);
/* only ep_bind really mucks around with the CQ */
/* only ep bind if we are not connecting to ourself and the dstnid is not a wildcard. this check
* is necessary as you can only bind an ep once and we must make sure we dont bind when already bound.
*/
if (connreq->gncr_dstnid != LNET_NID_ANY && dgram->gndg_conn_out.gncr_dstnid != connreq->gncr_srcnid) {
mutex_lock(&conn->gnc_device->gnd_cq_mutex);
rrc = kgnilnd_ep_bind(conn->gnc_ephandle,
connreq->gncr_gnparams.gnpr_host_id,
conn->gnc_cqid);
mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
if (rrc != GNI_RC_SUCCESS) {
rc = -ECONNABORTED;
goto return_out;
}
}
rrc = kgnilnd_ep_set_eventdata(conn->gnc_ephandle, conn->gnc_cqid,
connreq->gncr_gnparams.gnpr_cqid);
if (rrc != GNI_RC_SUCCESS) {
rc = -ECONNABORTED;
goto cleanup_out;
}
/* Initialize SMSG */
rrc = kgnilnd_smsg_init(conn->gnc_ephandle, &conn->gnpr_smsg_attr,
&connreq->gncr_gnparams.gnpr_smsg_attr);
if (unlikely(rrc == GNI_RC_INVALID_PARAM)) {
gni_smsg_attr_t *local = &conn->gnpr_smsg_attr;
/* help folks figure out if there is a tunable off, etc. */
LCONSOLE_ERROR("SMSG attribute mismatch. Data from local/remote:"
" type %d/%d msg_maxsize %u/%u"
" mbox_maxcredit %u/%u. Please check kgni"
" logs for further data\n",
local->msg_type, remote->msg_type,
local->msg_maxsize, remote->msg_maxsize,
local->mbox_maxcredit, remote->mbox_maxcredit);
}
if (rrc != GNI_RC_SUCCESS) {
rc = -ECONNABORTED;
goto cleanup_out;
}
/* log this for help in debuggin SMSG buffer re-use */
CDEBUG(D_NET, "conn %p src %s dst %s smsg %p acquired"
" local cqid %u SMSG %p->%u hndl %#llx.%#llx"
" remote cqid %u SMSG %p->%u hndl %#llx.%#llx\n",
conn, libcfs_nid2str(connreq->gncr_srcnid),
libcfs_nid2str(connreq->gncr_dstnid),
&conn->gnpr_smsg_attr,
conn->gnc_cqid,
conn->gnpr_smsg_attr.msg_buffer,
conn->gnpr_smsg_attr.mbox_offset,
conn->gnpr_smsg_attr.mem_hndl.qword1,
conn->gnpr_smsg_attr.mem_hndl.qword2,
rem_param->gnpr_cqid,
rem_param->gnpr_smsg_attr.msg_buffer,
rem_param->gnpr_smsg_attr.mbox_offset,
rem_param->gnpr_smsg_attr.mem_hndl.qword1,
rem_param->gnpr_smsg_attr.mem_hndl.qword2);
conn->gnc_peerstamp = connreq->gncr_peerstamp;
conn->gnc_peer_connstamp = connreq->gncr_connstamp;
conn->remote_mbox_addr = (void *)((char *)remote->msg_buffer + remote->mbox_offset);
/* We update the reaper timeout once we have a valid conn and timeout */
kgnilnd_update_reaper_timeout(GNILND_TO2KA(conn->gnc_timeout));
return 0;
cleanup_out:
rrc = kgnilnd_ep_unbind(conn->gnc_ephandle);
/* not sure I can just let this fly */
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_ep_unbind trying to cleanup: %d\n", rrc);
return_out:
LASSERTF(rc != 0, "SOFTWARE BUG: rc == 0\n");
CERROR("Error setting connection params from %s: %d\n",
libcfs_nid2str(connreq->gncr_srcnid), rc);
return rc;
}
/* needs down_read on kgn_net_rw_sem held from before this call until
* after the write_lock on kgn_peer_conn_lock - this ensures we stay sane
* with kgnilnd_shutdown - it'll get the sem and set shutdown, then get the
* kgn_peer_conn_lock to start del_peer'ing. If we hold the sem until after
* kgn_peer_conn_lock is held, we guarantee that nobody calls
* kgnilnd_add_peer_locked without checking gnn_shutdown */
int
kgnilnd_create_peer_safe(kgn_peer_t **peerp,
lnet_nid_t nid,
kgn_net_t *net,
int node_state)
{
kgn_peer_t *peer;
int rc;
LASSERT(nid != LNET_NID_ANY);
/* We dont pass the net around in the dgram anymore so here is where we find it
* this will work unless its in shutdown or the nid has a net that is invalid.
* Either way error code needs to be returned in that case.
*
* If the net passed in is not NULL then we can use it, this alleviates looking it
* when the calling function has access to the data.
*/
if (net == NULL) {
rc = kgnilnd_find_net(nid, &net);
if (rc < 0)
return rc;
} else {
/* find net adds a reference on the net if we are not using
* it we must do it manually so the net references are
* correct when tearing down the net
*/
kgnilnd_net_addref(net);
}
LIBCFS_ALLOC(peer, sizeof(*peer));
if (peer == NULL) {
kgnilnd_net_decref(net);
return -ENOMEM;
}
peer->gnp_nid = nid;
peer->gnp_state = node_state;
/* translate from nid to nic addr & store */
rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(nid), 1, &peer->gnp_host_id);
if (rc <= 0) {
kgnilnd_net_decref(net);
LIBCFS_FREE(peer, sizeof(*peer));
return -ESRCH;
}
CDEBUG(D_NET, "peer 0x%p->%s -> NIC 0x%x\n", peer,
libcfs_nid2str(nid), peer->gnp_host_id);
atomic_set(&peer->gnp_refcount, 1); /* 1 ref for caller */
atomic_set(&peer->gnp_dirty_eps, 0);
INIT_LIST_HEAD(&peer->gnp_list);
INIT_LIST_HEAD(&peer->gnp_connd_list);
INIT_LIST_HEAD(&peer->gnp_conns);
INIT_LIST_HEAD(&peer->gnp_tx_queue);
/* the first reconnect should happen immediately, so we leave
* gnp_reconnect_interval set to 0 */
LASSERTF(net != NULL, "peer 0x%p->%s with NULL net\n",
peer, libcfs_nid2str(nid));
/* must have kgn_net_rw_sem held for this... */
if (net->gnn_shutdown) {
/* shutdown has started already */
kgnilnd_net_decref(net);
LIBCFS_FREE(peer, sizeof(*peer));
return -ESHUTDOWN;
}
peer->gnp_net = net;
atomic_inc(&kgnilnd_data.kgn_npeers);
*peerp = peer;
return 0;
}
void
kgnilnd_destroy_peer(kgn_peer_t *peer)
{
CDEBUG(D_NET, "peer %s %p deleted\n",
libcfs_nid2str(peer->gnp_nid), peer);
LASSERTF(atomic_read(&peer->gnp_refcount) == 0,
"peer 0x%p->%s refs %d\n",
peer, libcfs_nid2str(peer->gnp_nid),
atomic_read(&peer->gnp_refcount));
LASSERTF(atomic_read(&peer->gnp_dirty_eps) == 0,
"peer 0x%p->%s dirty eps %d\n",
peer, libcfs_nid2str(peer->gnp_nid),
atomic_read(&peer->gnp_dirty_eps));
LASSERTF(peer->gnp_net != NULL, "peer %px (%s) with NULL net\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(!kgnilnd_peer_active(peer),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE || peer->gnp_connecting == GNILND_PEER_KILL,
"peer 0x%p->%s, connecting %d\n",
peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
LASSERTF(list_empty(&peer->gnp_conns),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(list_empty(&peer->gnp_tx_queue),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(list_empty(&peer->gnp_connd_list),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
/* NB a peer's connections keep a reference on their peer until
* they are destroyed, so we can be assured that _all_ state to do
* with this peer has been cleaned up when its refcount drops to
* zero. */
atomic_dec(&kgnilnd_data.kgn_npeers);
kgnilnd_net_decref(peer->gnp_net);
LIBCFS_FREE(peer, sizeof(*peer));
}
/* the conn might not have made it all the way through to a connected
* state - but we need to purgatory any conn that a remote peer might
* have seen through a posted dgram as well */
void
kgnilnd_add_purgatory_locked(kgn_conn_t *conn, kgn_peer_t *peer)
{
kgn_mbox_info_t *mbox = NULL;
ENTRY;
/* NB - the caller should own conn by removing him from the
* scheduler thread when finishing the close */
LASSERTF(peer != NULL, "conn %px with NULL peer\n", conn);
/* If this is still true, need to add the calls to unlink back in and
* figure out how to close the hole on loopback conns */
LASSERTF(kgnilnd_peer_active(peer),
"can't use inactive peer %s (%px) we'll never recover the resources\n",
libcfs_nid2str(peer->gnp_nid), peer);
CDEBUG(D_NET, "conn %p peer %p dev %p\n", conn, peer,
conn->gnc_device);
LASSERTF(conn->gnc_in_purgatory == 0,
"Conn already in purgatory\n");
conn->gnc_in_purgatory = 1;
mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
mbox->mbx_prev_purg_nid = peer->gnp_nid;
mbox->mbx_add_purgatory = jiffies;
kgnilnd_release_mbox(conn, 1);
LASSERTF(list_empty(&conn->gnc_mdd_list),
"conn 0x%p->%s with active purgatory hold MDD %d\n",
conn, libcfs_nid2str(peer->gnp_nid),
kgnilnd_count_list(&conn->gnc_mdd_list));
EXIT;
}
/* Instead of detaching everything from purgatory here we just mark the conn as needing
* detach, when the reaper checks the conn the next time it will detach it.
* Calling function requires write_lock held on kgn_peer_conn_lock
*/
void
kgnilnd_mark_for_detach_purgatory_all_locked(kgn_peer_t *peer) {
kgn_conn_t *conn;
list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
if (conn->gnc_in_purgatory && !conn->gnc_needs_detach) {
conn->gnc_needs_detach = 1;
kgnilnd_admin_addref(kgnilnd_data.kgn_npending_detach);
}
}
}
/* Calling function needs a write_lock held on kgn_peer_conn_lock */
void
kgnilnd_detach_purgatory_locked(kgn_conn_t *conn, struct list_head *conn_list)
{
kgn_mbox_info_t *mbox = NULL;
/* if needed, add the conn purgatory data to the list passed in */
if (conn->gnc_in_purgatory) {
CDEBUG(D_NET, "peer %p->%s purg_conn %p@%s mdd_list #tx %d\n",
conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
conn, kgnilnd_conn_state2str(conn),
kgnilnd_count_list(&conn->gnc_mdd_list));
mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
mbox->mbx_detach_of_purgatory = jiffies;
/* conn->gnc_list is the entry point on peer->gnp_conns, so detaching it
* here removes it from the list of 'valid' peer connections.
* We put the current conn onto a list of conns to call kgnilnd_release_purgatory_locked()
* and as such the caller of kgnilnd_detach_purgatory_locked() now owns that conn, since its not
* on the peer's conn_list anymore.
*/
list_del_init(&conn->gnc_list);
/* NB - only unlinking if we set pending in del_peer_locked from admin or
* shutdown */
if (kgnilnd_peer_active(conn->gnc_peer) &&
conn->gnc_peer->gnp_pending_unlink &&
kgnilnd_can_unlink_peer_locked(conn->gnc_peer)) {
kgnilnd_unlink_peer_locked(conn->gnc_peer);
}
/* The reaper will not call detach unless the conn is fully through kgnilnd_complete_closed_conn.
* If the conn is not in a DONE state somehow we are attempting to detach even though
* the conn has not been fully cleaned up. If we detach while the conn is still closing
* we will end up with an orphaned connection that has valid ep_handle, that is not on a
* peer.
*/
LASSERTF(conn->gnc_state == GNILND_CONN_DONE,
"Conn in invalid state %px@%s\n",
conn, kgnilnd_conn_state2str(conn));
/* move from peer to the delayed release list */
list_add_tail(&conn->gnc_list, conn_list);
}
}
void
kgnilnd_release_purgatory_list(struct list_head *conn_list)
{
kgn_device_t *dev;
kgn_conn_t *conn, *connN;
kgn_mdd_purgatory_t *gmp, *gmpN;
list_for_each_entry_safe(conn, connN, conn_list, gnc_list) {
dev = conn->gnc_device;
kgnilnd_release_mbox(conn, -1);
conn->gnc_in_purgatory = 0;
list_del_init(&conn->gnc_list);
/* gnc_needs_detach is set in kgnilnd_del_conn_or_peer. It is used to keep track
* of conns that have been marked for detach by kgnilnd_del_conn_or_peer.
* The function uses kgn_npending_detach to verify the conn has
* actually been detached.
*/
if (conn->gnc_needs_detach)
kgnilnd_admin_decref(kgnilnd_data.kgn_npending_detach);
/* if this guy is really dead (we are doing release from reaper),
* make sure we tell LNet - if this is from other context,
* the checks in the function will prevent an errant
* notification */
kgnilnd_peer_notify(conn->gnc_peer, conn->gnc_error, 0);
list_for_each_entry_safe(gmp, gmpN, &conn->gnc_mdd_list,
gmp_list) {
CDEBUG(D_NET,
"dev %p releasing held mdd %#llx.%#llx\n",
conn->gnc_device, gmp->gmp_map_key.qword1,
gmp->gmp_map_key.qword2);
atomic_dec(&dev->gnd_n_mdd_held);
kgnilnd_mem_mdd_release(conn->gnc_device->gnd_handle,
&gmp->gmp_map_key);
/* ignoring the return code - if kgni/ghal can't find it
* it must be released already */
list_del_init(&gmp->gmp_list);
LIBCFS_FREE(gmp, sizeof(*gmp));
}
/* lose conn ref for purgatory */
kgnilnd_conn_decref(conn);
}
}
/* needs write_lock on kgnilnd_data.kgn_peer_conn_lock held */
void
kgnilnd_peer_increase_reconnect_locked(kgn_peer_t *peer)
{
int current_to;
current_to = peer->gnp_reconnect_interval;
/* we'll try to reconnect fast the first time, then back-off */
if (current_to == 0) {
peer->gnp_reconnect_time = jiffies - 1;
current_to = *kgnilnd_tunables.kgn_min_reconnect_interval;
} else {
peer->gnp_reconnect_time = jiffies + cfs_time_seconds(current_to);
/* add 50% of min timeout & retry */
current_to += *kgnilnd_tunables.kgn_min_reconnect_interval / 2;
}
current_to = min(current_to,
*kgnilnd_tunables.kgn_max_reconnect_interval);
peer->gnp_reconnect_interval = current_to;
CDEBUG(D_NET, "peer %s can reconnect at %lu interval %lu\n",
libcfs_nid2str(peer->gnp_nid), peer->gnp_reconnect_time,
peer->gnp_reconnect_interval);
}
/* needs kgnilnd_data.kgn_peer_conn_lock held */
kgn_peer_t *
kgnilnd_find_peer_locked(lnet_nid_t nid)
{
struct list_head *peer_list = kgnilnd_nid2peerlist(nid);
kgn_peer_t *peer;
/* Chopping nid down to only NIDADDR using LNET_NIDADDR so we only
* have a single peer per device instead of a peer per nid/net combo.
*/
list_for_each_entry(peer, peer_list, gnp_list) {
if (LNET_NIDADDR(nid) != LNET_NIDADDR(peer->gnp_nid))
continue;
CDEBUG(D_NET, "got peer [%p] -> %s c %d (%d)\n",
peer, libcfs_nid2str(nid),
peer->gnp_connecting,
atomic_read(&peer->gnp_refcount));
return peer;
}
return NULL;
}
/* need write_lock on kgn_peer_conn_lock */
void
kgnilnd_unlink_peer_locked(kgn_peer_t *peer)
{
LASSERTF(list_empty(&peer->gnp_conns),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(list_empty(&peer->gnp_tx_queue),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
LASSERTF(kgnilnd_peer_active(peer),
"peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
CDEBUG(D_NET, "unlinking peer 0x%p->%s\n",
peer, libcfs_nid2str(peer->gnp_nid));
list_del_init(&peer->gnp_list);
kgnilnd_data.kgn_peer_version++;
kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
/* lose peerlist's ref */
kgnilnd_peer_decref(peer);
}
int
kgnilnd_get_peer_info(int index,
kgn_peer_t **found_peer,
lnet_nid_t *id, __u32 *nic_addr,
int *refcount, int *connecting)
{
kgn_peer_t *peer;
int i;
int rc = -ENOENT;
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
list_for_each_entry(peer, &kgnilnd_data.kgn_peers[i], gnp_list) {
if (index-- > 0)
continue;
CDEBUG(D_NET, "found peer %p (%s) at index %d\n",
peer, libcfs_nid2str(peer->gnp_nid), index);
*found_peer = peer;
*id = peer->gnp_nid;
*nic_addr = peer->gnp_host_id;
*refcount = atomic_read(&peer->gnp_refcount);
*connecting = peer->gnp_connecting;
rc = 0;
goto out;
}
}
out:
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
if (rc)
CDEBUG(D_NET, "no gni peer at index %d\n", index);
return rc;
}
/* requires write_lock on kgn_peer_conn_lock held */
void
kgnilnd_add_peer_locked(lnet_nid_t nid, kgn_peer_t *new_stub_peer, kgn_peer_t **peerp)
{
kgn_peer_t *peer, *peer2;
LASSERTF(new_stub_peer != NULL, "bad stub peer for nid %s\n",
libcfs_nid2str(nid));
peer2 = kgnilnd_find_peer_locked(nid);
if (peer2 != NULL) {
/* A peer was created during the lock transition, so drop
* the new one we created */
kgnilnd_peer_decref(new_stub_peer);
peer = peer2;
} else {
peer = new_stub_peer;
/* peer table takes existing ref on peer */
LASSERTF(!kgnilnd_peer_active(peer),
"peer 0x%p->%s already in peer table\n",
peer, libcfs_nid2str(peer->gnp_nid));
list_add_tail(&peer->gnp_list,
kgnilnd_nid2peerlist(nid));
kgnilnd_data.kgn_peer_version++;
}
LASSERTF(peer->gnp_net != NULL, "peer 0x%p->%s with NULL net\n",
peer, libcfs_nid2str(peer->gnp_nid));
*peerp = peer;
}
int
kgnilnd_add_peer(kgn_net_t *net, lnet_nid_t nid, kgn_peer_t **peerp)
{
kgn_peer_t *peer;
int rc;
int node_state;
ENTRY;
if (nid == LNET_NID_ANY)
return -EINVAL;
node_state = kgnilnd_get_node_state(LNET_NIDADDR(nid));
/* 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;
RETURN(rc);
}
rc = kgnilnd_create_peer_safe(&peer, nid, net, node_state);
if (rc != 0) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
RETURN(rc);
}
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
up_read(&kgnilnd_data.kgn_net_rw_sem);
kgnilnd_add_peer_locked(nid, peer, peerp);
CDEBUG(D_NET, "peer 0x%p->%s connecting %d\n",
peerp, libcfs_nid2str((*peerp)->gnp_nid),
(*peerp)->gnp_connecting);
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
RETURN(0);
}
/* needs write_lock on kgn_peer_conn_lock */
void
kgnilnd_cancel_peer_connect_locked(kgn_peer_t *peer, struct list_head *zombies)
{
kgn_tx_t *tx, *txn;
/* we do care about state of gnp_connecting - we could be between
* reconnect attempts, so try to find the dgram and cancel the TX
* anyways. If we are in the process of posting DONT do anything;
* once it fails or succeeds we can nuke the connect attempt.
* We have no idea where in kgnilnd_post_dgram we are so we cant
* attempt to cancel until the function is done.
*/
/* make sure peer isn't in process of connecting or waiting for connect*/
spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
if (!(list_empty(&peer->gnp_connd_list))) {
list_del_init(&peer->gnp_connd_list);
/* remove connd ref */
kgnilnd_peer_decref(peer);
}
spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
if (peer->gnp_connecting == GNILND_PEER_POSTING || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
peer->gnp_connecting = GNILND_PEER_NEEDS_DEATH;
/* We are in process of posting right now the xchg set it up for us to
* cancel the connect so we are finished for now */
} else {
/* no need for exchange we have the peer lock and its ready for us to nuke */
LASSERTF(peer->gnp_connecting != GNILND_PEER_POSTING,
"Peer in invalid state 0x%p->%s, connecting %d\n",
peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
peer->gnp_connecting = GNILND_PEER_IDLE;
set_mb(peer->gnp_last_dgram_errno, -ETIMEDOUT);
kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
peer->gnp_nid);
}
/* The least we can do is nuke the tx's no matter what.... */
list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
kgnilnd_tx_del_state_locked(tx, peer, NULL,
GNILND_TX_ALLOCD);
list_add_tail(&tx->tx_list, zombies);
}
}
/* needs write_lock on kgn_peer_conn_lock */
void
kgnilnd_del_peer_locked(kgn_peer_t *peer, int error)
{
/* this peer could be passive and only held for purgatory,
* take a ref to ensure it doesn't disappear in this function */
kgnilnd_peer_addref(peer);
CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
/* if purgatory release cleared it out, don't try again */
if (kgnilnd_peer_active(peer)) {
/* always do this to allow kgnilnd_start_connect and
* kgnilnd_finish_connect to catch this before they
* wrap up their operations */
if (kgnilnd_can_unlink_peer_locked(peer)) {
/* already released purgatory, so only active
* conns hold it */
kgnilnd_unlink_peer_locked(peer);
} else {
kgnilnd_close_peer_conns_locked(peer, error);
/* peer unlinks itself when last conn is closed */
}
}
/* we are done, release back to the wild */
kgnilnd_peer_decref(peer);
}
int
kgnilnd_del_conn_or_peer(kgn_net_t *net, lnet_nid_t nid, int command,
int error)
{
LIST_HEAD (souls);
LIST_HEAD (zombies);
kgn_peer_t *peer, *pnxt;
int lo;
int hi;
int i;
int rc = -ENOENT;
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
if (nid != LNET_NID_ANY)
lo = hi = kgnilnd_nid2peerlist(nid) - kgnilnd_data.kgn_peers;
else {
lo = 0;
hi = *kgnilnd_tunables.kgn_peer_hash_size - 1;
/* wildcards always succeed */
rc = 0;
}
for (i = lo; i <= hi; i++) {
list_for_each_entry_safe(peer, pnxt, &kgnilnd_data.kgn_peers[i],
gnp_list) {
LASSERTF(peer->gnp_net != NULL,
"peer %px (%s) with NULL net\n",
peer, libcfs_nid2str(peer->gnp_nid));
if (net != NULL && peer->gnp_net != net)
continue;
if (!(nid == LNET_NID_ANY || LNET_NIDADDR(peer->gnp_nid) == LNET_NIDADDR(nid)))
continue;
/* In both cases, we want to stop any in-flight
* connect attempts */
kgnilnd_cancel_peer_connect_locked(peer, &zombies);
switch (command) {
case GNILND_DEL_CONN:
kgnilnd_close_peer_conns_locked(peer, error);
break;
case GNILND_DEL_PEER:
peer->gnp_pending_unlink = 1;
kgnilnd_admin_addref(kgnilnd_data.kgn_npending_unlink);
kgnilnd_mark_for_detach_purgatory_all_locked(peer);
kgnilnd_del_peer_locked(peer, error);
break;
case GNILND_CLEAR_PURGATORY:
/* Mark everything ready for detach reaper will cleanup
* once we release the kgn_peer_conn_lock
*/
kgnilnd_mark_for_detach_purgatory_all_locked(peer);
peer->gnp_last_errno = -EISCONN;
/* clear reconnect so he can reconnect soon */
peer->gnp_reconnect_time = 0;
peer->gnp_reconnect_interval = 0;
break;
default:
CERROR("bad command %d\n", command);
LBUG();
}
/* we matched something */
rc = 0;
}
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* nuke peer TX */
kgnilnd_txlist_done(&zombies, error);
/* This function does not return until the commands it initiated have completed,
* since they have to work there way through the other threads. In the case of shutdown
* threads are not woken up until after this call is initiated so we cannot wait, we just
* need to return. The same applies for stack reset we shouldnt wait as the reset thread
* handles closing.
*/
CFS_RACE(CFS_FAIL_GNI_RACE_RESET);
if (error == -ENOTRECOVERABLE || error == -ESHUTDOWN) {
return rc;
}
wait_var_event_warning(&kgnilnd_data,
!atomic_read(&kgnilnd_data.kgn_npending_conns) &&
!atomic_read(&kgnilnd_data.kgn_npending_detach) &&
!atomic_read(&kgnilnd_data.kgn_npending_unlink),
"Waiting on %d peers %d closes %d detaches\n",
atomic_read(&kgnilnd_data.kgn_npending_unlink),
atomic_read(&kgnilnd_data.kgn_npending_conns),
atomic_read(&kgnilnd_data.kgn_npending_detach));
return rc;
}
kgn_conn_t *
kgnilnd_get_conn_by_idx(int index)
{
kgn_peer_t *peer;
kgn_conn_t *conn;
int i;
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
list_for_each_entry(peer, &kgnilnd_data.kgn_peers[i], gnp_list) {
list_for_each_entry(conn, &peer->gnp_conns, gnc_list) {
if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
continue;
if (index-- > 0)
continue;
CDEBUG(D_NET, "++conn[%p] -> %s (%d)\n", conn,
libcfs_nid2str(conn->gnc_peer->gnp_nid),
atomic_read(&conn->gnc_refcount));
kgnilnd_conn_addref(conn);
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
return conn;
}
}
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
}
return NULL;
}
int
kgnilnd_get_conn_info(kgn_peer_t *peer,
int *device_id, __u64 *peerstamp,
int *tx_seq, int *rx_seq,
int *fmaq_len, int *nfma, int *nrdma)
{
kgn_conn_t *conn;
int rc = 0;
read_lock(&kgnilnd_data.kgn_peer_conn_lock);
conn = kgnilnd_find_conn_locked(peer);
if (conn == NULL) {
rc = -ENOENT;
goto out;
}
*device_id = conn->gnc_device->gnd_host_id;
*peerstamp = conn->gnc_peerstamp;
*tx_seq = atomic_read(&conn->gnc_tx_seq);
*rx_seq = atomic_read(&conn->gnc_rx_seq);
*fmaq_len = kgnilnd_count_list(&conn->gnc_fmaq);
*nfma = atomic_read(&conn->gnc_nlive_fma);
*nrdma = atomic_read(&conn->gnc_nlive_rdma);
out:
read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
return rc;
}
/* needs write_lock on kgn_peer_conn_lock */
int
kgnilnd_close_peer_conns_locked(kgn_peer_t *peer, int why)
{
kgn_conn_t *conn;
struct list_head *ctmp, *cnxt;
int count = 0;
list_for_each_safe(ctmp, cnxt, &peer->gnp_conns) {
conn = list_entry(ctmp, kgn_conn_t, gnc_list);
if (conn->gnc_state != GNILND_CONN_ESTABLISHED)
continue;
count++;
/* we mark gnc_needs closing and increment kgn_npending_conns so that
* kgnilnd_del_conn_or_peer can wait on the other threads closing
* and cleaning up the connection.
*/
if (!conn->gnc_needs_closing) {
conn->gnc_needs_closing = 1;
kgnilnd_admin_addref(kgnilnd_data.kgn_npending_conns);
}
kgnilnd_close_conn_locked(conn, why);
}
return count;
}
int
kgnilnd_report_node_state(lnet_nid_t nid, int down)
{
int rc;
kgn_peer_t *peer, *new_peer;
LIST_HEAD(zombies);
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
peer = kgnilnd_find_peer_locked(nid);
if (peer == NULL) {
int i;
int found_net = 0;
kgn_net_t *net;
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
/* Don't add a peer for node up events */
if (down == GNILND_PEER_UP)
return 0;
/* find any valid net - we don't care which one... */
down_read(&kgnilnd_data.kgn_net_rw_sem);
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
list_for_each_entry(net, &kgnilnd_data.kgn_nets[i],
gnn_list) {
found_net = 1;
break;
}
if (found_net) {
break;
}
}
up_read(&kgnilnd_data.kgn_net_rw_sem);
if (!found_net) {
CNETERR("Could not find a net for nid %lld\n", nid);
return 1;
}
/* The nid passed in does not yet contain the net portion.
* Let's build it up now
*/
nid = LNET_MKNID(LNET_NID_NET(&net->gnn_ni->ni_nid), nid);
rc = kgnilnd_add_peer(net, nid, &new_peer);
if (rc) {
CNETERR("Could not add peer for nid %lld, rc %d\n",
nid, rc);
return 1;
}
write_lock(&kgnilnd_data.kgn_peer_conn_lock);
peer = kgnilnd_find_peer_locked(nid);
if (peer == NULL) {
CNETERR("Could not find peer for nid %lld\n", nid);
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
return 1;
}
}
peer->gnp_state = down;
if (down == GNILND_PEER_DOWN) {
kgn_conn_t *conn;
peer->gnp_down_event_time = jiffies;
kgnilnd_cancel_peer_connect_locked(peer, &zombies);
conn = kgnilnd_find_conn_locked(peer);
if (conn != NULL) {
kgnilnd_close_conn_locked(conn, -ENETRESET);
}
} else {
peer->gnp_up_event_time = jiffies;
}
write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
if (down == GNILND_PEER_DOWN) {
/* using ENETRESET so we don't get messages from
* kgnilnd_tx_done
*/
kgnilnd_txlist_done(&zombies, -ENETRESET);
kgnilnd_peer_notify(peer, -ECONNRESET, 0);
LCONSOLE_INFO("Received down event for nid %d\n",
LNET_NIDADDR(nid));
}
return 0;
}
int
kgnilnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
{
struct libcfs_ioctl_data *data = arg;
kgn_net_t *net = ni->ni_data;
int rc = -EINVAL;
LASSERT(ni == net->gnn_ni);
switch (cmd) {
case IOC_LIBCFS_GET_PEER: {
lnet_nid_t nid = 0;
kgn_peer_t *peer = NULL;
__u32 nic_addr = 0;
__u64 peerstamp = 0;
int peer_refcount = 0, peer_connecting = 0;
int device_id = 0;
int tx_seq = 0, rx_seq = 0;
int fmaq_len = 0, nfma = 0, nrdma = 0;
rc = kgnilnd_get_peer_info(data->ioc_count, &peer,
&nid, &nic_addr, &peer_refcount,
&peer_connecting);
if (rc)
break;
/* Barf */
/* LNET_MKNID is used to mask from lnet the multiplexing/demultiplexing of connections and peers
* LNET assumes a conn and peer per net, the LNET_MKNID/LNET_NIDADDR allows us to let Lnet see what it
* wants to see instead of the underlying network that is being used to send the data
*/
data->ioc_nid = LNET_MKNID(LNET_NID_NET(&ni->ni_nid),
LNET_NIDADDR(nid));
data->ioc_flags = peer_connecting;
data->ioc_count = peer_refcount;
rc = kgnilnd_get_conn_info(peer, &device_id, &peerstamp,
&tx_seq, &rx_seq, &fmaq_len,
&nfma, &nrdma);
/* This is allowable - a persistent peer could not
* have a connection */
if (rc) {
/* flag to indicate we are not connected -
* need to print as such */
data->ioc_flags |= (1<<16);
rc = 0;
} else {
/* still barf */
data->ioc_net = device_id;
data->ioc_u64[0] = peerstamp;
data->ioc_u32[0] = fmaq_len;
data->ioc_u32[1] = nfma;
data->ioc_u32[2] = tx_seq;
data->ioc_u32[3] = rx_seq;
data->ioc_u32[4] = nrdma;
}
break;
}
case IOC_LIBCFS_ADD_PEER: {
/* just dummy value to allow using common interface */
kgn_peer_t *peer;
rc = kgnilnd_add_peer(net, data->ioc_nid, &peer);
break;
}
case IOC_LIBCFS_DEL_PEER: {
/* NULL is passed in so it affects all peers in existence without regard to network
* as the peer may not exist on the network LNET believes it to be on.
*/
rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
GNILND_DEL_PEER, -EUCLEAN);
break;
}
case IOC_LIBCFS_GET_CONN: {
kgn_conn_t *conn = kgnilnd_get_conn_by_idx(data->ioc_count);
if (conn == NULL)
rc = -ENOENT;
else {
rc = 0;
/* LNET_MKNID is used to build the correct address based on what LNET wants to see instead of
* the generic connection that is used to send the data
*/
data->ioc_nid = LNET_MKNID(LNET_NID_NET(&ni->ni_nid),
LNET_NIDADDR(conn->gnc_peer->gnp_nid));
data->ioc_u32[0] = conn->gnc_device->gnd_id;
kgnilnd_conn_decref(conn);
}
break;
}
case IOC_LIBCFS_CLOSE_CONNECTION: {
/* use error = -ENETRESET to indicate it was lctl disconnect */
/* NULL is passed in so it affects all the nets as the connection is virtual
* and may not exist on the network LNET believes it to be on.
*/
rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
GNILND_DEL_CONN, -ENETRESET);
break;
}
case IOC_LIBCFS_PUSH_CONNECTION: {
/* we use this to flush purgatory */
rc = kgnilnd_del_conn_or_peer(NULL, data->ioc_nid,
GNILND_CLEAR_PURGATORY, -EUCLEAN);
break;
}
case IOC_LIBCFS_REGISTER_MYNID: {
/* Ignore if this is a noop */
if (data->ioc_nid == lnet_nid_to_nid4(&ni->ni_nid)) {
rc = 0;
} else {
CERROR("obsolete IOC_LIBCFS_REGISTER_MYNID: %s(%s)\n",
libcfs_nid2str(data->ioc_nid),
libcfs_nidstr(&ni->ni_nid));
rc = -EINVAL;
}
break;
}
}
return rc;
}
int
kgnilnd_dev_init(kgn_device_t *dev)
{
gni_return_t rrc;
int rc = 0;
unsigned int cq_size;
ENTRY;
/* size of these CQs should be able to accommodate the outgoing
* RDMA and SMSG transactions. Since we really don't know what we
* really need here, we'll take credits * 2 * 3 to allow a bunch.
* We need to dig into this more with the performance work. */
cq_size = *kgnilnd_tunables.kgn_credits * 2 * 3;
rrc = kgnilnd_cdm_create(dev->gnd_id, *kgnilnd_tunables.kgn_ptag,
*kgnilnd_tunables.kgn_pkey, 0,
&dev->gnd_domain);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't create CDM %d (%d)\n", dev->gnd_id, rrc);
GOTO(failed, rc = -ENODEV);
}
rrc = kgnilnd_cdm_attach(dev->gnd_domain, dev->gnd_id,
&dev->gnd_host_id, &dev->gnd_handle);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't attach CDM to device %d (%d)\n",
dev->gnd_id, rrc);
GOTO(failed, rc = -ENODEV);
}
/* a bit gross, but not much we can do - Aries Sim doesn't have
* hardcoded NIC/NID that we can use */
rc = kgnilnd_setup_nic_translation(dev->gnd_host_id);
if (rc != 0)
GOTO(failed, rc = -ENODEV);
/* only dev 0 gets the errors - no need to reset the stack twice
* - this works because we have a single PTAG, if we had more
* then we'd need to have multiple handlers */
if (dev->gnd_id == 0) {
rrc = kgnilnd_subscribe_errors(dev->gnd_handle,
GNI_ERRMASK_CRITICAL |
GNI_ERRMASK_UNKNOWN_TRANSACTION,
0, NULL, kgnilnd_critical_error,
&dev->gnd_err_handle);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't subscribe for errors on device %d: rc %d\n",
dev->gnd_id, rrc);
GOTO(failed, rc = -ENODEV);
}
rc = kgnilnd_set_quiesce_callback(dev->gnd_handle,
kgnilnd_quiesce_end_callback);
if (rc != GNI_RC_SUCCESS) {
CERROR("Can't subscribe for quiesce callback on device %d: rc %d\n",
dev->gnd_id, rrc);
GOTO(failed, rc = -ENODEV);
}
}
rc = kgnilnd_nicaddr_to_nid(dev->gnd_host_id, &dev->gnd_nid);
if (rc < 0) {
/* log messages during startup */
if (kgnilnd_data.kgn_init < GNILND_INIT_ALL) {
CERROR("couldn't translate host_id 0x%x to nid. rc %d\n",
dev->gnd_host_id, rc);
}
GOTO(failed, rc = -ESRCH);
}
CDEBUG(D_NET, "NIC %x -> NID %d\n", dev->gnd_host_id, dev->gnd_nid);
rrc = kgnilnd_cq_create(dev->gnd_handle, *kgnilnd_tunables.kgn_credits,
0, kgnilnd_device_callback,
dev->gnd_id, &dev->gnd_snd_rdma_cqh);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't create rdma send cq size %u for device "
"%d (%d)\n", cq_size, dev->gnd_id, rrc);
GOTO(failed, rc = -EINVAL);
}
rrc = kgnilnd_cq_create(dev->gnd_handle, cq_size,
0, kgnilnd_device_callback, dev->gnd_id,
&dev->gnd_snd_fma_cqh);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't create fma send cq size %u for device %d (%d)\n",
cq_size, dev->gnd_id, rrc);
GOTO(failed, rc = -EINVAL);
}
/* This one we size differently - overflows are possible and it needs to be
* sized based on machine size */
rrc = kgnilnd_cq_create(dev->gnd_handle,
*kgnilnd_tunables.kgn_fma_cq_size,
0, kgnilnd_device_callback, dev->gnd_id,
&dev->gnd_rcv_fma_cqh);
if (rrc != GNI_RC_SUCCESS) {
CERROR("Can't create fma cq size %d for device %d (%d)\n",
*kgnilnd_tunables.kgn_fma_cq_size, dev->gnd_id, rrc);
GOTO(failed, rc = -EINVAL);
}
rrc = kgnilnd_register_smdd_buf(dev);
if (rrc != GNI_RC_SUCCESS) {
GOTO(failed, rc = -EINVAL);
}
RETURN(0);
failed:
kgnilnd_dev_fini(dev);
RETURN(rc);
}
void
kgnilnd_dev_fini(kgn_device_t *dev)
{
gni_return_t rrc;
ENTRY;
/* At quiesce or rest time, need to loop through and clear gnd_ready_conns ?*/
LASSERTF(list_empty(&dev->gnd_ready_conns) &&
list_empty(&dev->gnd_map_tx) &&
list_empty(&dev->gnd_rdmaq) &&
list_empty(&dev->gnd_delay_conns),
"dev 0x%p ready_conns %d@0x%p delay_conns %d@0x%p"
"map_tx %d@0x%p rdmaq %d@0x%p\n",
dev, kgnilnd_count_list(&dev->gnd_ready_conns), &dev->gnd_ready_conns,
kgnilnd_count_list(&dev->gnd_delay_conns), &dev->gnd_delay_conns,
kgnilnd_count_list(&dev->gnd_map_tx), &dev->gnd_map_tx,
kgnilnd_count_list(&dev->gnd_rdmaq), &dev->gnd_rdmaq);
/* These should follow from tearing down all connections */
LASSERTF(dev->gnd_map_nphys == 0 && dev->gnd_map_physnop == 0,
"%d physical mappings of %d pages still mapped\n",
dev->gnd_map_nphys, dev->gnd_map_physnop);
LASSERTF(atomic_read(&dev->gnd_n_mdd) == 0 &&
atomic_read(&dev->gnd_n_mdd_held) == 0 &&
atomic64_read(&dev->gnd_nbytes_map) == 0,
"%d SMSG mappings of %lld bytes still mapped or held %d\n",
atomic_read(&dev->gnd_n_mdd),
(u64)atomic64_read(&dev->gnd_nbytes_map),
atomic_read(&dev->gnd_n_mdd_held));
LASSERT(list_empty(&dev->gnd_map_list));
/* What other assertions needed to ensure all connections torn down ? */
/* check all counters == 0 (EP, MDD, etc) */
/* if we are resetting due to quiese (stack reset), don't check
* thread states */
LASSERTF(kgnilnd_data.kgn_quiesce_trigger ||
atomic_read(&kgnilnd_data.kgn_nthreads) == 0,
"tried to shutdown with threads active\n");
if (dev->gnd_smdd_hold_buf) {
rrc = kgnilnd_deregister_smdd_buf(dev);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from deregistion of sMDD buffer: %d\n", rrc);
dev->gnd_smdd_hold_buf = NULL;
}
if (dev->gnd_rcv_fma_cqh) {
rrc = kgnilnd_cq_destroy(dev->gnd_rcv_fma_cqh);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_cq_destroy on rcv_fma_cqh: %d\n", rrc);
dev->gnd_rcv_fma_cqh = NULL;
}
if (dev->gnd_snd_rdma_cqh) {
rrc = kgnilnd_cq_destroy(dev->gnd_snd_rdma_cqh);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_cq_destroy on send_rdma_cqh: %d\n", rrc);
dev->gnd_snd_rdma_cqh = NULL;
}
if (dev->gnd_snd_fma_cqh) {
rrc = kgnilnd_cq_destroy(dev->gnd_snd_fma_cqh);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_cq_destroy on snd_fma_cqh: %d\n", rrc);
dev->gnd_snd_fma_cqh = NULL;
}
if (dev->gnd_err_handle) {
rrc = kgnilnd_release_errors(dev->gnd_err_handle);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_release_errors: %d\n", rrc);
dev->gnd_err_handle = NULL;
}
if (dev->gnd_domain) {
rrc = kgnilnd_cdm_destroy(dev->gnd_domain);
LASSERTF(rrc == GNI_RC_SUCCESS,
"bad rc from gni_cdm_destroy: %d\n", rrc);
dev->gnd_domain = NULL;
}
EXIT;
}
int kgnilnd_base_startup(void)
{
long long pkmem = libcfs_kmem_read();
int rc;
int i;
kgn_device_t *dev;
struct task_struct *thrd;
#if defined(CONFIG_CRAY_XT) && !defined(CONFIG_CRAY_COMPUTE)
/* limit how much memory can be allocated for fma blocks in
* instances where many nodes need to reconnects at the same time */
struct sysinfo si;
si_meminfo(&si);
kgnilnd_data.free_pages_limit = si.totalram/4;
#endif
ENTRY;
LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_NOTHING,
"init %d\n", kgnilnd_data.kgn_init);
/* zero pointers, flags etc */
memset(&kgnilnd_data, 0, sizeof(kgnilnd_data));
kgnilnd_check_kgni_version();
/* CAVEAT EMPTOR: Every 'Fma' message includes the sender's NID and
* a unique (for all time) connstamp so we can uniquely identify
* the sender. The connstamp is an incrementing counter
* initialised with seconds + microseconds at startup time. So we
* rely on NOT creating connections more frequently on average than
* 1MHz to ensure we don't use old connstamps when we reboot. */
kgnilnd_data.kgn_connstamp =
kgnilnd_data.kgn_peerstamp =
ktime_get_seconds();
init_rwsem(&kgnilnd_data.kgn_net_rw_sem);
for (i = 0; i < GNILND_MAXDEVS; i++) {
kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
dev->gnd_id = i;
INIT_LIST_HEAD(&dev->gnd_ready_conns);
INIT_LIST_HEAD(&dev->gnd_delay_conns);
INIT_LIST_HEAD(&dev->gnd_map_tx);
INIT_LIST_HEAD(&dev->gnd_fma_buffs);
mutex_init(&dev->gnd_cq_mutex);
mutex_init(&dev->gnd_fmablk_mutex);
spin_lock_init(&dev->gnd_fmablk_lock);
init_waitqueue_head(&dev->gnd_waitq);
init_waitqueue_head(&dev->gnd_dgram_waitq);
init_waitqueue_head(&dev->gnd_dgping_waitq);
spin_lock_init(&dev->gnd_lock);
INIT_LIST_HEAD(&dev->gnd_map_list);
spin_lock_init(&dev->gnd_map_lock);
atomic_set(&dev->gnd_nfmablk, 0);
atomic_set(&dev->gnd_fmablk_vers, 1);
atomic_set(&dev->gnd_neps, 0);
atomic_set(&dev->gnd_canceled_dgrams, 0);
INIT_LIST_HEAD(&dev->gnd_connd_peers);
spin_lock_init(&dev->gnd_connd_lock);
spin_lock_init(&dev->gnd_dgram_lock);
spin_lock_init(&dev->gnd_rdmaq_lock);
INIT_LIST_HEAD(&dev->gnd_rdmaq);
init_rwsem(&dev->gnd_conn_sem);
/* alloc & setup nid based dgram table */
CFS_ALLOC_PTR_ARRAY(dev->gnd_dgrams,
*kgnilnd_tunables.kgn_peer_hash_size);
if (dev->gnd_dgrams == NULL)
GOTO(failed, rc = -ENOMEM);
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
INIT_LIST_HEAD(&dev->gnd_dgrams[i]);
}
atomic_set(&dev->gnd_ndgrams, 0);
atomic_set(&dev->gnd_nwcdgrams, 0);
/* setup timer for RDMAQ processing */
cfs_timer_setup(&dev->gnd_rdmaq_timer,
kgnilnd_schedule_device_timer,
(unsigned long)dev, 0);
/* setup timer for mapping processing */
cfs_timer_setup(&dev->gnd_map_timer,
kgnilnd_schedule_device_timer,
(unsigned long)dev, 0);
}
/* CQID 0 isn't allowed, set to MAX_MSG_ID - 1 to check for conflicts early */
kgnilnd_data.kgn_next_cqid = GNILND_MAX_MSG_ID - 1;
kgnilnd_data.kgn_new_min_timeout = *kgnilnd_tunables.kgn_timeout;
init_waitqueue_head(&kgnilnd_data.kgn_reaper_waitq);
init_waitqueue_head(&kgnilnd_data.kgn_ruhroh_waitq);
spin_lock_init(&kgnilnd_data.kgn_reaper_lock);
mutex_init(&kgnilnd_data.kgn_quiesce_mutex);
atomic_set(&kgnilnd_data.kgn_nquiesce, 0);
atomic_set(&kgnilnd_data.kgn_npending_conns, 0);
atomic_set(&kgnilnd_data.kgn_npending_unlink, 0);
atomic_set(&kgnilnd_data.kgn_npending_detach, 0);
atomic_set(&kgnilnd_data.kgn_rev_offset, 0);
atomic_set(&kgnilnd_data.kgn_rev_length, 0);
atomic_set(&kgnilnd_data.kgn_rev_copy_buff, 0);
/* OK to call kgnilnd_api_shutdown() to cleanup now */
kgnilnd_data.kgn_init = GNILND_INIT_DATA;
if (!try_module_get(THIS_MODULE))
GOTO(failed, rc = -ENOENT);
rwlock_init(&kgnilnd_data.kgn_peer_conn_lock);
CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_peers,
*kgnilnd_tunables.kgn_peer_hash_size);
if (kgnilnd_data.kgn_peers == NULL)
GOTO(failed, rc = -ENOMEM);
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
INIT_LIST_HEAD(&kgnilnd_data.kgn_peers[i]);
}
CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_conns,
*kgnilnd_tunables.kgn_peer_hash_size);
if (kgnilnd_data.kgn_conns == NULL)
GOTO(failed, rc = -ENOMEM);
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
INIT_LIST_HEAD(&kgnilnd_data.kgn_conns[i]);
}
CFS_ALLOC_PTR_ARRAY(kgnilnd_data.kgn_nets,
*kgnilnd_tunables.kgn_net_hash_size);
if (kgnilnd_data.kgn_nets == NULL)
GOTO(failed, rc = -ENOMEM);
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
INIT_LIST_HEAD(&kgnilnd_data.kgn_nets[i]);
}
kgnilnd_data.kgn_mbox_cache =
kmem_cache_create("kgn_mbox_block", GNILND_MBOX_SIZE, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (kgnilnd_data.kgn_mbox_cache == NULL) {
CERROR("Can't create slab for physical mbox blocks\n");
GOTO(failed, rc = -ENOMEM);
}
kgnilnd_data.kgn_rx_cache =
kmem_cache_create("kgn_rx_t", sizeof(kgn_rx_t), 0, 0, NULL);
if (kgnilnd_data.kgn_rx_cache == NULL) {
CERROR("Can't create slab for kgn_rx_t descriptors\n");
GOTO(failed, rc = -ENOMEM);
}
kgnilnd_data.kgn_tx_cache =
kmem_cache_create("kgn_tx_t", sizeof(kgn_tx_t), 0, 0, NULL);
if (kgnilnd_data.kgn_tx_cache == NULL) {
CERROR("Can't create slab for kgn_tx_t\n");
GOTO(failed, rc = -ENOMEM);
}
kgnilnd_data.kgn_tx_phys_cache =
kmem_cache_create("kgn_tx_phys",
GNILND_MAX_IOV * sizeof(gni_mem_segment_t),
0, 0, NULL);
if (kgnilnd_data.kgn_tx_phys_cache == NULL) {
CERROR("Can't create slab for kgn_tx_phys\n");
GOTO(failed, rc = -ENOMEM);
}
kgnilnd_data.kgn_dgram_cache =
kmem_cache_create("kgn_dgram_t", sizeof(kgn_dgram_t), 0, 0, NULL);
if (kgnilnd_data.kgn_dgram_cache == NULL) {
CERROR("Can't create slab for outgoing datagrams\n");
GOTO(failed, rc = -ENOMEM);
}
/* allocate a MAX_IOV array of page pointers for each cpu */
kgnilnd_data.kgn_cksum_map_pages = kmalloc(num_possible_cpus() * sizeof (struct page *),
GFP_KERNEL);
if (kgnilnd_data.kgn_cksum_map_pages == NULL) {
CERROR("Can't allocate vmap cksum pages\n");
GOTO(failed, rc = -ENOMEM);
}
kgnilnd_data.kgn_cksum_npages = num_possible_cpus();
memset(kgnilnd_data.kgn_cksum_map_pages, 0,
kgnilnd_data.kgn_cksum_npages * sizeof (struct page *));
for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
kgnilnd_data.kgn_cksum_map_pages[i] = kmalloc(GNILND_MAX_IOV * sizeof (struct page *),
GFP_KERNEL);
if (kgnilnd_data.kgn_cksum_map_pages[i] == NULL) {
CERROR("Can't allocate vmap cksum pages for cpu %d\n", i);
GOTO(failed, rc = -ENOMEM);
}
}
LASSERT(kgnilnd_data.kgn_ndevs == 0);
/* Use all available GNI devices */
for (i = 0; i < GNILND_MAXDEVS; i++) {
dev = &kgnilnd_data.kgn_devices[kgnilnd_data.kgn_ndevs];
rc = kgnilnd_dev_init(dev);
if (rc == 0) {
/* Increment here so base_shutdown cleans it up */
kgnilnd_data.kgn_ndevs++;
rc = kgnilnd_allocate_phys_fmablk(dev);
if (rc)
GOTO(failed, rc);
}
}
if (kgnilnd_data.kgn_ndevs == 0) {
CERROR("Can't initialise any GNI devices\n");
GOTO(failed, rc = -ENODEV);
}
rc = kgnilnd_thread_start(kgnilnd_reaper, NULL, "kgnilnd_rpr", 0);
if (rc != 0) {
CERROR("Can't spawn gnilnd reaper: %d\n", rc);
GOTO(failed, rc);
}
rc = kgnilnd_start_rca_thread();
if (rc != 0) {
CERROR("Can't spawn gnilnd rca: %d\n", rc);
GOTO(failed, rc);
}
/*
* Start ruhroh thread. We can't use kgnilnd_thread_start() because
* we don't want this thread included in kgnilnd_data.kgn_nthreads
* count. This thread controls quiesce, so it mustn't
* quiesce itself.
*/
thrd = kthread_run(kgnilnd_ruhroh_thread, NULL, "%s_%02d", "kgnilnd_rr", 0);
if (IS_ERR(thrd)) {
rc = PTR_ERR(thrd);
CERROR("Can't spawn gnilnd ruhroh thread: %d\n", rc);
GOTO(failed, rc);
}
/* threads will load balance across devs as they are available */
if (*kgnilnd_tunables.kgn_thread_affinity) {
rc = kgnilnd_start_sd_threads();
if (rc != 0)
GOTO(failed, rc);
} else {
for (i = 0; i < *kgnilnd_tunables.kgn_sched_threads; i++) {
rc = kgnilnd_thread_start(kgnilnd_scheduler,
(void *)((long)i),
"kgnilnd_sd", i);
if (rc != 0) {
CERROR("Can't spawn gnilnd scheduler[%d]: %d\n",
i, rc);
GOTO(failed, rc);
}
}
}
for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
dev = &kgnilnd_data.kgn_devices[i];
rc = kgnilnd_thread_start(kgnilnd_dgram_mover, dev,
"kgnilnd_dg", dev->gnd_id);
if (rc != 0) {
CERROR("Can't spawn gnilnd dgram_mover[%d]: %d\n",
dev->gnd_id, rc);
GOTO(failed, rc);
}
rc = kgnilnd_thread_start(kgnilnd_dgram_waitq, dev,
"kgnilnd_dgn", dev->gnd_id);
if (rc != 0) {
CERROR("Can't spawn gnilnd dgram_waitq[%d]: %d\n",
dev->gnd_id, rc);
GOTO(failed, rc);
}
rc = kgnilnd_setup_wildcard_dgram(dev);
if (rc != 0) {
CERROR("Can't create wildcard dgrams[%d]: %d\n",
dev->gnd_id, rc);
GOTO(failed, rc);
}
}
/* flag everything initialised */
kgnilnd_data.kgn_init = GNILND_INIT_ALL;
/*****************************************************/
CDEBUG(D_MALLOC, "initial kmem %lld\n", pkmem);
RETURN(0);
failed:
kgnilnd_base_shutdown();
kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
RETURN(rc);
}
void
kgnilnd_base_shutdown(void)
{
int i, j;
ENTRY;
while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_SHUTDOWN, 1)) {};
kgnilnd_data.kgn_wc_kill = 1;
for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
kgnilnd_cancel_wc_dgrams(dev);
kgnilnd_cancel_dgrams(dev);
kgnilnd_del_conn_or_peer(NULL, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
kgnilnd_wait_for_canceled_dgrams(dev);
}
/* We need to verify there are no conns left before we let the threads
* shut down otherwise we could clean up the peers but still have
* some outstanding conns due to orphaned datagram conns that are
* being cleaned up.
*/
i = 2;
while (atomic_read(&kgnilnd_data.kgn_nconns) != 0) {
i++;
for(j = 0; j < kgnilnd_data.kgn_ndevs; ++j) {
kgn_device_t *dev = &kgnilnd_data.kgn_devices[j];
kgnilnd_schedule_device(dev);
}
CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
"Waiting for conns to be cleaned up %d\n",atomic_read(&kgnilnd_data.kgn_nconns));
schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
/* Peer state all cleaned up BEFORE setting shutdown, so threads don't
* have to worry about shutdown races. NB connections may be created
* while there are still active connds, but these will be temporary
* since peer creation always fails after the listener has started to
* shut down.
* all peers should have been cleared out on the nets */
LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
"peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
/* Wait for the ruhroh thread to shut down. */
kgnilnd_data.kgn_ruhroh_shutdown = 1;
wake_up(&kgnilnd_data.kgn_ruhroh_waitq);
i = 2;
while (kgnilnd_data.kgn_ruhroh_running != 0) {
i++;
CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
"Waiting for ruhroh thread to terminate\n");
schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
/* Flag threads to terminate */
kgnilnd_data.kgn_shutdown = 1;
for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
/* should clear all the MDDs */
kgnilnd_unmap_fma_blocks(dev);
kgnilnd_schedule_device(dev);
wake_up(&dev->gnd_dgram_waitq);
wake_up(&dev->gnd_dgping_waitq);
LASSERT(list_empty(&dev->gnd_connd_peers));
}
spin_lock(&kgnilnd_data.kgn_reaper_lock);
wake_up(&kgnilnd_data.kgn_reaper_waitq);
spin_unlock(&kgnilnd_data.kgn_reaper_lock);
if (atomic_read(&kgnilnd_data.kgn_nthreads))
kgnilnd_wakeup_rca_thread();
/* Wait for threads to exit */
i = 2;
while (atomic_read(&kgnilnd_data.kgn_nthreads) != 0) {
i++;
CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
"Waiting for %d threads to terminate\n",
atomic_read(&kgnilnd_data.kgn_nthreads));
schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
LASSERTF(atomic_read(&kgnilnd_data.kgn_npeers) == 0,
"peers left %d\n", atomic_read(&kgnilnd_data.kgn_npeers));
if (kgnilnd_data.kgn_peers != NULL) {
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
LASSERT(list_empty(&kgnilnd_data.kgn_peers[i]));
CFS_FREE_PTR_ARRAY(kgnilnd_data.kgn_peers,
*kgnilnd_tunables.kgn_peer_hash_size);
}
down_write(&kgnilnd_data.kgn_net_rw_sem);
if (kgnilnd_data.kgn_nets != NULL) {
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++)
LASSERT(list_empty(&kgnilnd_data.kgn_nets[i]));
CFS_FREE_PTR_ARRAY(kgnilnd_data.kgn_nets,
*kgnilnd_tunables.kgn_net_hash_size);
}
up_write(&kgnilnd_data.kgn_net_rw_sem);
LASSERTF(atomic_read(&kgnilnd_data.kgn_nconns) == 0,
"conns left %d\n", atomic_read(&kgnilnd_data.kgn_nconns));
if (kgnilnd_data.kgn_conns != NULL) {
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++)
LASSERT(list_empty(&kgnilnd_data.kgn_conns[i]));
CFS_FREE_PTR_ARRAY(kgnilnd_data.kgn_conns,
*kgnilnd_tunables.kgn_peer_hash_size);
}
for (i = 0; i < kgnilnd_data.kgn_ndevs; i++) {
kgn_device_t *dev = &kgnilnd_data.kgn_devices[i];
kgnilnd_dev_fini(dev);
LASSERTF(atomic_read(&dev->gnd_ndgrams) == 0,
"dgrams left %d\n", atomic_read(&dev->gnd_ndgrams));
if (dev->gnd_dgrams != NULL) {
for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size;
i++)
LASSERT(list_empty(&dev->gnd_dgrams[i]));
CFS_FREE_PTR_ARRAY(dev->gnd_dgrams,
*kgnilnd_tunables.kgn_peer_hash_size);
}
kgnilnd_free_phys_fmablk(dev);
}
if (kgnilnd_data.kgn_mbox_cache != NULL)
kmem_cache_destroy(kgnilnd_data.kgn_mbox_cache);
if (kgnilnd_data.kgn_rx_cache != NULL)
kmem_cache_destroy(kgnilnd_data.kgn_rx_cache);
if (kgnilnd_data.kgn_tx_cache != NULL)
kmem_cache_destroy(kgnilnd_data.kgn_tx_cache);
if (kgnilnd_data.kgn_tx_phys_cache != NULL)
kmem_cache_destroy(kgnilnd_data.kgn_tx_phys_cache);
if (kgnilnd_data.kgn_dgram_cache != NULL)
kmem_cache_destroy(kgnilnd_data.kgn_dgram_cache);
if (kgnilnd_data.kgn_cksum_map_pages != NULL) {
for (i = 0; i < kgnilnd_data.kgn_cksum_npages; i++) {
if (kgnilnd_data.kgn_cksum_map_pages[i] != NULL) {
kfree(kgnilnd_data.kgn_cksum_map_pages[i]);
}
}
kfree(kgnilnd_data.kgn_cksum_map_pages);
}
CDEBUG(D_MALLOC, "after NAL cleanup: kmem %lld\n",
libcfs_kmem_read());
kgnilnd_data.kgn_init = GNILND_INIT_NOTHING;
module_put(THIS_MODULE);
EXIT;
}
int
kgnilnd_startup(struct lnet_ni *ni)
{
int rc, devno;
kgn_net_t *net;
ENTRY;
LASSERTF(ni->ni_net->net_lnd == &the_kgnilnd,
"bad LND 0x%p != the_kgnilnd @ 0x%p\n",
ni->ni_net->net_lnd, &the_kgnilnd);
if (kgnilnd_data.kgn_init == GNILND_INIT_NOTHING) {
rc = kgnilnd_base_startup();
if (rc != 0)
RETURN(rc);
}
/* Serialize with shutdown. */
mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
LIBCFS_ALLOC(net, sizeof(*net));
if (net == NULL) {
CERROR("could not allocate net for new interface instance\n");
/* no need to cleanup the CDM... */
GOTO(failed, rc = -ENOMEM);
}
INIT_LIST_HEAD(&net->gnn_list);
ni->ni_data = net;
net->gnn_ni = ni;
kgnilnd_tunables_setup(ni);
if (!ni->ni_interface || !strlen(ni->ni_interface)) {
rc = lnet_ni_add_interface(ni, "ipogif0");
if (rc < 0)
CWARN("gnilnd failed to allocate ni_interface\n");
}
if (*kgnilnd_tunables.kgn_peer_health) {
int fudge;
int timeout;
/* give this a bit of leeway - we don't have a hard timeout
* as we only check timeouts periodically - see comment in kgnilnd_reaper */
fudge = (GNILND_TO2KA(*kgnilnd_tunables.kgn_timeout) / GNILND_REAPER_NCHECKS);
timeout = *kgnilnd_tunables.kgn_timeout + fudge;
if (*kgnilnd_tunables.kgn_peer_timeout >= timeout) {
ni->ni_net->net_tunables.lct_peer_timeout =
*kgnilnd_tunables.kgn_peer_timeout;
} else if (*kgnilnd_tunables.kgn_peer_timeout > -1) {
LCONSOLE_ERROR("Peer_timeout is set to %d but needs to be >= %d\n",
*kgnilnd_tunables.kgn_peer_timeout,
timeout);
ni->ni_data = NULL;
LIBCFS_FREE(net, sizeof(*net));
GOTO(failed, rc = -EINVAL);
} else
ni->ni_net->net_tunables.lct_peer_timeout = timeout;
LCONSOLE_INFO("Enabling LNet peer health for gnilnd, timeout %ds\n",
ni->ni_net->net_tunables.lct_peer_timeout);
}
atomic_set(&net->gnn_refcount, 1);
/* if we have multiple devices, spread the nets around */
net->gnn_netnum = LNET_NETNUM(LNET_NID_NET(&ni->ni_nid));
devno = LNET_NID_NET(&ni->ni_nid) % GNILND_MAXDEVS;
net->gnn_dev = &kgnilnd_data.kgn_devices[devno];
/* allocate a 'dummy' cdm for datagram use. We can only have a single
* datagram between a nid:inst_id and nid2:inst_id. The fake cdm
* give us additional inst_id to use, allowing the datagrams to flow
* like rivers of honey and beer */
/* the instance id for the cdm is the NETNUM offset by MAXDEVS -
* ensuring we'll have a unique id */
ni->ni_nid.nid_addr[0] =
cpu_to_be32(LNET_NIDADDR(net->gnn_dev->gnd_nid));
CDEBUG(D_NET, "adding net %p nid=%s on dev %d \n",
net, libcfs_nidstr(&ni->ni_nid), net->gnn_dev->gnd_id);
/* until the gnn_list is set, we need to cleanup ourselves as
* kgnilnd_shutdown is just gonna get confused */
down_write(&kgnilnd_data.kgn_net_rw_sem);
list_add_tail(&net->gnn_list, kgnilnd_netnum2netlist(net->gnn_netnum));
up_write(&kgnilnd_data.kgn_net_rw_sem);
/* we need a separate thread to call probe_wait_by_id until
* we get a function callback notifier from kgni */
mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
RETURN(0);
failed:
mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
kgnilnd_shutdown(ni);
RETURN(rc);
}
void
kgnilnd_shutdown(struct lnet_ni *ni)
{
kgn_net_t *net = ni->ni_data;
int i;
int rc;
ENTRY;
CFS_RACE(CFS_FAIL_GNI_SR_DOWN_RACE);
LASSERTF(kgnilnd_data.kgn_init == GNILND_INIT_ALL,
"init %d\n", kgnilnd_data.kgn_init);
/* Serialize with startup. */
mutex_lock(&kgnilnd_data.kgn_quiesce_mutex);
CDEBUG(D_MALLOC, "before NAL cleanup: kmem %lld\n",
libcfs_kmem_read());
if (net == NULL) {
CERROR("got NULL net for ni %p\n", ni);
GOTO(out, rc = -EINVAL);
}
LASSERTF(ni == net->gnn_ni,
"ni %px gnn_ni %px\n", net, net->gnn_ni);
ni->ni_data = NULL;
LASSERT(!net->gnn_shutdown);
LASSERTF(atomic_read(&net->gnn_refcount) != 0,
"net %px refcount %d\n",
net, atomic_read(&net->gnn_refcount));
if (!list_empty(&net->gnn_list)) {
/* serialize with peer creation */
down_write(&kgnilnd_data.kgn_net_rw_sem);
net->gnn_shutdown = 1;
up_write(&kgnilnd_data.kgn_net_rw_sem);
kgnilnd_cancel_net_dgrams(net);
kgnilnd_del_conn_or_peer(net, LNET_NID_ANY, GNILND_DEL_PEER, -ESHUTDOWN);
/* if we are quiesced, need to wake up - we need those threads
* alive to release peers, etc */
if (GNILND_IS_QUIESCED) {
set_mb(kgnilnd_data.kgn_quiesce_trigger, GNILND_QUIESCE_IDLE);
kgnilnd_quiesce_wait("shutdown");
}
kgnilnd_wait_for_canceled_dgrams(net->gnn_dev);
/* We wait until the nets ref's are 1, we will release final ref which is ours
* this allows us to make sure everything else is done before we free the
* net.
*/
i = 4;
while (atomic_read(&net->gnn_refcount) != 1) {
i++;
CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
"Waiting for %d references to clear on net %d\n",
atomic_read(&net->gnn_refcount),
net->gnn_netnum);
schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
/* release ref from kgnilnd_startup */
kgnilnd_net_decref(net);
/* serialize with reaper and conn_task looping */
down_write(&kgnilnd_data.kgn_net_rw_sem);
list_del_init(&net->gnn_list);
up_write(&kgnilnd_data.kgn_net_rw_sem);
}
/* not locking, this can't race with writers */
LASSERTF(atomic_read(&net->gnn_refcount) == 0,
"net %px refcount %d\n",
net, atomic_read(&net->gnn_refcount));
LIBCFS_FREE(net, sizeof(*net));
out:
down_read(&kgnilnd_data.kgn_net_rw_sem);
for (i = 0; i < *kgnilnd_tunables.kgn_net_hash_size; i++) {
if (!list_empty(&kgnilnd_data.kgn_nets[i])) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
break;
}
if (i == *kgnilnd_tunables.kgn_net_hash_size - 1) {
up_read(&kgnilnd_data.kgn_net_rw_sem);
kgnilnd_base_shutdown();
}
}
CDEBUG(D_MALLOC, "after NAL cleanup: kmem %lld\n",
libcfs_kmem_read());
mutex_unlock(&kgnilnd_data.kgn_quiesce_mutex);
EXIT;
}
static void __exit kgnilnd_exit(void)
{
lnet_unregister_lnd(&the_kgnilnd);
kgnilnd_proc_fini();
kgnilnd_remove_sysctl();
}
static int __init kgnilnd_init(void)
{
int rc;
rc = kgnilnd_tunables_init();
if (rc != 0)
return rc;
LCONSOLE_INFO("Lustre: kgnilnd build version: "LUSTRE_VERSION_STRING"\n");
kgnilnd_insert_sysctl();
kgnilnd_proc_init();
rc = libcfs_setup();
if (rc)
return rc;
lnet_register_lnd(&the_kgnilnd);
return 0;
}
MODULE_AUTHOR("Cray, Inc. <nic@cray.com>");
MODULE_DESCRIPTION("Gemini LNet Network Driver");
MODULE_VERSION(LUSTRE_VERSION_STRING);
MODULE_LICENSE("GPL");
late_initcall_sync(kgnilnd_init);
module_exit(kgnilnd_exit);
