Viewing: socklnd_cb.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
*
* Copyright (c) 2011, 2017, Intel Corporation.
*/
/* This file is part of Lustre, http://www.lustre.org
*
* Author: Zach Brown <zab@zabbo.net>
* Author: Peter J. Braam <braam@clusterfs.com>
* Author: Phil Schwan <phil@clusterfs.com>
* Author: Eric Barton <eric@bartonsoftware.com>
*/
#include "socklnd.h"
#include <linux/sunrpc/addr.h>
struct ksock_tx *
ksocknal_alloc_tx(int type, int size)
{
struct ksock_tx *tx = NULL;
if (type == KSOCK_MSG_NOOP) {
LASSERT(size == KSOCK_NOOP_TX_SIZE);
/* searching for a noop tx in free list */
spin_lock(&ksocknal_data.ksnd_tx_lock);
tx = list_first_entry_or_null(&ksocknal_data.ksnd_idle_noop_txs,
struct ksock_tx, tx_list);
if (tx) {
LASSERT(tx->tx_desc_size == size);
list_del(&tx->tx_list);
}
spin_unlock(&ksocknal_data.ksnd_tx_lock);
}
if (tx == NULL)
LIBCFS_ALLOC(tx, size);
if (tx == NULL)
return NULL;
refcount_set(&tx->tx_refcount, 1);
tx->tx_zc_aborted = 0;
tx->tx_zc_capable = 0;
tx->tx_zc_checked = 0;
tx->tx_hstatus = LNET_MSG_STATUS_OK;
tx->tx_desc_size = size;
atomic_inc(&ksocknal_data.ksnd_nactive_txs);
return tx;
}
struct ksock_tx *
ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
{
struct ksock_tx *tx;
tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE);
if (tx == NULL) {
CERROR("Can't allocate noop tx desc\n");
return NULL;
}
tx->tx_conn = NULL;
tx->tx_lnetmsg = NULL;
tx->tx_kiov = NULL;
tx->tx_nkiov = 0;
tx->tx_niov = 1;
tx->tx_nonblk = nonblk;
tx->tx_msg.ksm_csum = 0;
tx->tx_msg.ksm_type = KSOCK_MSG_NOOP;
tx->tx_msg.ksm_zc_cookies[0] = 0;
tx->tx_msg.ksm_zc_cookies[1] = cookie;
return tx;
}
void
ksocknal_free_tx(struct ksock_tx *tx)
{
atomic_dec(&ksocknal_data.ksnd_nactive_txs);
if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) {
/* it's a noop tx */
spin_lock(&ksocknal_data.ksnd_tx_lock);
list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs);
spin_unlock(&ksocknal_data.ksnd_tx_lock);
} else {
LIBCFS_FREE(tx, tx->tx_desc_size);
}
}
static int
ksocknal_send_hdr(struct ksock_conn *conn, struct ksock_tx *tx)
{
struct kvec *iov = &tx->tx_hdr;
int nob;
int rc;
LASSERT(tx->tx_niov > 0);
/* Never touch tx->tx_hdr inside ksocknal_lib_send_hdr() */
rc = ksocknal_lib_send_hdr(conn, tx);
if (rc <= 0) /* sent nothing? */
return rc;
nob = rc;
LASSERT(nob <= tx->tx_resid);
tx->tx_resid -= nob;
/* "consume" iov */
LASSERT(tx->tx_niov == 1);
if (nob < (int) iov->iov_len) {
iov->iov_base += nob;
iov->iov_len -= nob;
return rc;
}
LASSERT(nob == iov->iov_len);
tx->tx_niov--;
return rc;
}
static int
ksocknal_send_kiov(struct ksock_conn *conn, struct ksock_tx *tx)
{
struct bio_vec *kiov = tx->tx_kiov;
int nob;
int rc;
LASSERT(tx->tx_niov == 0);
LASSERT(tx->tx_nkiov > 0);
/* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */
rc = ksocknal_lib_send_kiov(conn, tx);
if (rc <= 0) /* sent nothing? */
return rc;
nob = rc;
LASSERT(nob <= tx->tx_resid);
tx->tx_resid -= nob;
/* "consume" kiov */
do {
LASSERT(tx->tx_nkiov > 0);
if (nob < (int)kiov->bv_len) {
kiov->bv_offset += nob;
kiov->bv_len -= nob;
return rc;
}
nob -= (int)kiov->bv_len;
tx->tx_kiov = ++kiov;
tx->tx_nkiov--;
} while (nob != 0);
return rc;
}
static int
ksocknal_transmit(struct ksock_conn *conn, struct ksock_tx *tx)
{
int rc;
int bufnob;
if (ksocknal_data.ksnd_stall_tx != 0)
schedule_timeout_uninterruptible(
cfs_time_seconds(ksocknal_data.ksnd_stall_tx));
LASSERT(tx->tx_resid != 0);
rc = ksocknal_connsock_addref(conn);
if (rc != 0) {
LASSERT(conn->ksnc_closing);
return -ESHUTDOWN;
}
do {
if (ksocknal_data.ksnd_enomem_tx > 0) {
/* testing... */
ksocknal_data.ksnd_enomem_tx--;
rc = -EAGAIN;
} else if (tx->tx_niov != 0) {
rc = ksocknal_send_hdr(conn, tx);
} else {
rc = ksocknal_send_kiov(conn, tx);
}
bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
if (rc > 0) /* sent something? */
conn->ksnc_tx_bufnob += rc; /* account it */
if (bufnob < conn->ksnc_tx_bufnob) {
/* allocated send buffer bytes < computed; infer
* something got ACKed
*/
conn->ksnc_tx_deadline = ktime_get_seconds() +
ksocknal_timeout();
conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
conn->ksnc_tx_bufnob = bufnob;
smp_mb();
}
if (rc <= 0) { /* Didn't write anything? */
/* some stacks return 0 instead of -EAGAIN */
if (rc == 0)
rc = -EAGAIN;
/* Check if EAGAIN is due to memory pressure */
if (rc == -EAGAIN && ksocknal_lib_memory_pressure(conn))
rc = -ENOMEM;
break;
}
/* socket's wmem_queued now includes 'rc' bytes */
atomic_sub(rc, &conn->ksnc_tx_nob);
rc = 0;
} while (tx->tx_resid != 0);
ksocknal_connsock_decref(conn);
return rc;
}
static int
ksocknal_recv_iter(struct ksock_conn *conn)
{
int nob;
int rc;
/* Never touch conn->ksnc_rx_to or change connection
* status inside ksocknal_lib_recv
*/
rc = ksocknal_lib_recv(conn);
if (rc <= 0)
return rc;
/* received something... */
nob = rc;
conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
conn->ksnc_rx_deadline = ktime_get_seconds() +
ksocknal_timeout();
mb(); /* order with setting rx_started */
conn->ksnc_rx_started = 1;
conn->ksnc_rx_nob_left -= nob;
iov_iter_advance(&conn->ksnc_rx_to, nob);
if (iov_iter_count(&conn->ksnc_rx_to))
return -EAGAIN;
return 1;
}
static int
ksocknal_receive(struct ksock_conn *conn)
{
/* Return 1 on success, 0 on EOF, < 0 on error.
* Caller checks ksnc_rx_nob_wanted to determine
* progress/completion.
*/
int rc;
ENTRY;
if (ksocknal_data.ksnd_stall_rx != 0)
schedule_timeout_uninterruptible(
cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
rc = ksocknal_connsock_addref(conn);
if (rc != 0) {
LASSERT(conn->ksnc_closing);
return -ESHUTDOWN;
}
for (;;) {
rc = ksocknal_recv_iter(conn);
if (rc <= 0) {
/* error/EOF or partial receive */
if (rc == -EAGAIN) {
rc = 1;
} else if (rc == 0 && conn->ksnc_rx_started) {
/* EOF in the middle of a message */
rc = -EPROTO;
}
break;
}
/* Completed a fragment */
if (!iov_iter_count(&conn->ksnc_rx_to)) {
rc = 1;
break;
}
}
ksocknal_connsock_decref(conn);
RETURN(rc);
}
void
ksocknal_tx_done(struct lnet_ni *ni, struct ksock_tx *tx, int rc)
{
struct lnet_msg *lnetmsg = tx->tx_lnetmsg;
enum lnet_msg_hstatus hstatus = tx->tx_hstatus;
LASSERT(ni != NULL || tx->tx_conn != NULL);
if (!rc && (tx->tx_resid != 0 || tx->tx_zc_aborted)) {
rc = -EIO;
if (hstatus == LNET_MSG_STATUS_OK)
hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
}
if (tx->tx_conn != NULL)
ksocknal_conn_decref(tx->tx_conn);
ksocknal_free_tx(tx);
if (lnetmsg != NULL) { /* KSOCK_MSG_NOOP go without lnetmsg */
lnetmsg->msg_health_status = hstatus;
lnet_finalize(lnetmsg, rc);
}
}
void
ksocknal_txlist_done(struct lnet_ni *ni, struct list_head *txlist, int error)
{
struct ksock_tx *tx;
while ((tx = list_first_entry_or_null(txlist, struct ksock_tx,
tx_list)) != NULL) {
if (error && tx->tx_lnetmsg) {
CNETERR("Deleting packet type %d len %d %s->%s\n",
tx->tx_lnetmsg->msg_type,
tx->tx_lnetmsg->msg_len,
libcfs_nidstr(&tx->tx_lnetmsg->msg_initiator),
libcfs_nidstr(&tx->tx_lnetmsg->msg_target.nid));
} else if (error) {
CNETERR("Deleting noop packet\n");
}
list_del(&tx->tx_list);
if (tx->tx_hstatus == LNET_MSG_STATUS_OK) {
if (error == -ETIMEDOUT)
tx->tx_hstatus =
LNET_MSG_STATUS_NETWORK_TIMEOUT;
else if (error == -ENETDOWN ||
error == -EHOSTUNREACH ||
error == -ENETUNREACH ||
error == -ECONNREFUSED ||
error == -ECONNRESET)
tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
/* for all other errors we don't want to retransmit */
else if (error)
tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
}
LASSERT(refcount_read(&tx->tx_refcount) == 1);
ksocknal_tx_done(ni, tx, error);
}
}
static void
ksocknal_check_zc_req(struct ksock_tx *tx)
{
struct ksock_conn *conn = tx->tx_conn;
struct ksock_peer_ni *peer_ni = conn->ksnc_peer;
/* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx
* to ksnp_zc_req_list if some fragment of this message should be sent
* zero-copy. Our peer_ni will send an ACK containing this cookie when
* she has received this message to tell us we can signal completion.
* tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on
* ksnp_zc_req_list.
*/
LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
LASSERT(tx->tx_zc_capable);
tx->tx_zc_checked = 1;
if (conn->ksnc_proto == &ksocknal_protocol_v1x ||
!conn->ksnc_zc_capable)
return;
/* assign cookie and queue tx to pending list, it will be released when
* a matching ack is received. See ksocknal_handle_zcack()
*/
ksocknal_tx_addref(tx);
spin_lock(&peer_ni->ksnp_lock);
/* ZC_REQ is going to be pinned to the peer_ni */
tx->tx_deadline = ktime_get_seconds() +
ksocknal_timeout();
LASSERT(tx->tx_msg.ksm_zc_cookies[0] == 0);
tx->tx_msg.ksm_zc_cookies[0] = peer_ni->ksnp_zc_next_cookie++;
if (peer_ni->ksnp_zc_next_cookie == 0)
peer_ni->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
list_add_tail(&tx->tx_zc_list, &peer_ni->ksnp_zc_req_list);
spin_unlock(&peer_ni->ksnp_lock);
}
static void
ksocknal_uncheck_zc_req(struct ksock_tx *tx)
{
struct ksock_peer_ni *peer_ni = tx->tx_conn->ksnc_peer;
LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
LASSERT(tx->tx_zc_capable);
tx->tx_zc_checked = 0;
spin_lock(&peer_ni->ksnp_lock);
if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
/* Not waiting for an ACK */
spin_unlock(&peer_ni->ksnp_lock);
return;
}
tx->tx_msg.ksm_zc_cookies[0] = 0;
list_del(&tx->tx_zc_list);
spin_unlock(&peer_ni->ksnp_lock);
ksocknal_tx_decref(tx);
}
static int
ksocknal_process_transmit(struct ksock_conn *conn, struct ksock_tx *tx)
{
int rc;
bool error_sim = false;
if (lnet_send_error_simulation(tx->tx_lnetmsg, &tx->tx_hstatus)) {
error_sim = true;
rc = -EINVAL;
goto simulate_error;
}
if (tx->tx_zc_capable && !tx->tx_zc_checked)
ksocknal_check_zc_req(tx);
rc = ksocknal_transmit(conn, tx);
CDEBUG(D_NET, "send(%d) %d\n", tx->tx_resid, rc);
if (tx->tx_resid == 0) {
/* Sent everything OK */
LASSERT(rc == 0);
return 0;
}
if (rc == -EAGAIN)
return rc;
if (rc == -ENOMEM) {
static int counter;
counter++; /* exponential backoff warnings */
if ((counter & (-counter)) == counter)
CWARN("%u ENOMEM tx %p (%lld allocated)\n",
counter, conn, libcfs_kmem_read());
/* Queue on ksnd_enomem_conns for retry after a timeout */
spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
/* enomem list takes over scheduler's ref... */
LASSERT(conn->ksnc_tx_scheduled);
list_add_tail(&conn->ksnc_tx_list,
&ksocknal_data.ksnd_enomem_conns);
if (ktime_get_seconds() + SOCKNAL_ENOMEM_RETRY <
ksocknal_data.ksnd_reaper_waketime)
wake_up(&ksocknal_data.ksnd_reaper_waitq);
spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
/* set the health status of the message which determines
* whether we should retry the transmit
*/
tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
return rc;
}
simulate_error:
/* Actual error */
LASSERT(rc < 0);
if (!error_sim) {
/* set the health status of the message which determines
* whether we should retry the transmit
*/
if (rc == -ETIMEDOUT)
tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_TIMEOUT;
else
tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
}
if (!conn->ksnc_closing) {
switch (rc) {
case -ECONNRESET:
LCONSOLE_WARN("Host %pISc reset our connection while we were sending data; it may have rebooted: rc = %d\n",
&conn->ksnc_peeraddr, rc);
break;
case -ETIMEDOUT:
LCONSOLE_WARN("Timeout error while writing to %pISp. Closing socket: rc = %d\n",
&conn->ksnc_peeraddr, rc);
break;
default:
LCONSOLE_WARN("There was an unexpected network error while writing to %pISc: rc = %d\n",
&conn->ksnc_peeraddr, rc);
break;
}
CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pIScp\n",
conn, rc, libcfs_idstr(&conn->ksnc_peer->ksnp_id),
&conn->ksnc_peeraddr);
}
if (tx->tx_zc_checked)
ksocknal_uncheck_zc_req(tx);
/* it's not an error if conn is being closed */
if (!error_sim)
ksocknal_close_conn_and_siblings(conn,
(conn->ksnc_closing) ? 0 : rc);
return rc;
}
static void
ksocknal_launch_connection_locked(struct ksock_conn_cb *conn_cb)
{
/* called holding write lock on ksnd_global_lock */
LASSERT(!conn_cb->ksnr_scheduled);
LASSERT(!conn_cb->ksnr_connecting);
LASSERT((ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected) != 0);
/* scheduling conn for connd */
conn_cb->ksnr_scheduled = 1;
/* extra ref for connd */
ksocknal_conn_cb_addref(conn_cb);
spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
list_add_tail(&conn_cb->ksnr_connd_list,
&ksocknal_data.ksnd_connd_routes);
wake_up(&ksocknal_data.ksnd_connd_waitq);
spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
}
void
ksocknal_launch_all_connections_locked(struct ksock_peer_ni *peer_ni)
{
struct ksock_conn_cb *conn_cb;
/* called holding write lock on ksnd_global_lock */
for (;;) {
/* launch any/all connections that need it */
conn_cb = ksocknal_find_connectable_conn_cb_locked(peer_ni);
if (conn_cb == NULL)
return;
ksocknal_launch_connection_locked(conn_cb);
}
}
struct ksock_conn *
ksocknal_find_conn_locked(struct ksock_peer_ni *peer_ni, struct ksock_tx *tx, int nonblk)
{
struct ksock_conn *c;
struct ksock_conn *conn;
struct ksock_conn *typed = NULL;
struct ksock_conn *fallback = NULL;
int tnob = 0;
int fnob = 0;
list_for_each_entry(c, &peer_ni->ksnp_conns, ksnc_list) {
int nob = atomic_read(&c->ksnc_tx_nob) +
c->ksnc_sock->sk->sk_wmem_queued;
int rc;
LASSERT(!c->ksnc_closing);
LASSERT(c->ksnc_proto != NULL &&
c->ksnc_proto->pro_match_tx != NULL);
rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk);
switch (rc) {
case SOCKNAL_MATCH_NO: /* protocol rejected the tx */
continue;
case SOCKNAL_MATCH_YES: /* typed connection */
if (typed == NULL || tnob > nob ||
(tnob == nob && *ksocknal_tunables.ksnd_round_robin &&
typed->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
typed = c;
tnob = nob;
}
break;
case SOCKNAL_MATCH_MAY: /* fallback connection */
if (fallback == NULL || fnob > nob ||
(fnob == nob && *ksocknal_tunables.ksnd_round_robin &&
fallback->ksnc_tx_last_post > c->ksnc_tx_last_post)) {
fallback = c;
fnob = nob;
}
break;
default:
LBUG();
}
}
/* prefer the typed selection */
conn = (typed != NULL) ? typed : fallback;
if (conn != NULL)
conn->ksnc_tx_last_post = ktime_get_seconds();
return conn;
}
void
ksocknal_tx_prep(struct ksock_conn *conn, struct ksock_tx *tx)
{
conn->ksnc_proto->pro_pack(tx);
atomic_add(tx->tx_nob, &conn->ksnc_tx_nob);
ksocknal_conn_addref(conn); /* +1 ref for tx */
tx->tx_conn = conn;
}
void
ksocknal_queue_tx_locked(struct ksock_tx *tx, struct ksock_conn *conn)
{
struct ksock_sched *sched = conn->ksnc_scheduler;
struct ksock_msg *msg = &tx->tx_msg;
struct ksock_tx *ztx = NULL;
int bufnob = 0;
/* called holding global lock (read or irq-write) and caller may
* not have dropped this lock between finding conn and calling me,
* so we don't need the {get,put}connsock dance to deref
* ksnc_sock...
*/
LASSERT(!conn->ksnc_closing);
CDEBUG(D_NET, "Sending to %s ip %pIScp\n",
libcfs_idstr(&conn->ksnc_peer->ksnp_id),
&conn->ksnc_peeraddr);
ksocknal_tx_prep(conn, tx);
/* Ensure the frags we've been given EXACTLY match the number of
* bytes we want to send. Many TCP/IP stacks disregard any total
* size parameters passed to them and just look at the frags.
*
* We always expect at least 1 mapped fragment containing the
* complete ksocknal message header.
*/
LASSERT(lnet_iov_nob(tx->tx_niov, &tx->tx_hdr) +
lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) ==
(unsigned int)tx->tx_nob);
LASSERT(tx->tx_niov >= 1);
LASSERT(tx->tx_resid == tx->tx_nob);
CDEBUG(D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n",
tx, tx->tx_lnetmsg ? tx->tx_lnetmsg->msg_type : KSOCK_MSG_NOOP,
tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
bufnob = conn->ksnc_sock->sk->sk_wmem_queued;
spin_lock_bh(&sched->kss_lock);
if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) {
/* First packet starts the timeout */
conn->ksnc_tx_deadline = ktime_get_seconds() +
ksocknal_timeout();
if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
conn->ksnc_peer->ksnp_last_alive = ktime_get_seconds();
conn->ksnc_tx_bufnob = 0;
smp_mb(); /* order with adding to tx_queue */
}
if (msg->ksm_type == KSOCK_MSG_NOOP) {
/* The packet is noop ZC ACK, try to piggyback the ack_cookie
* on a normal packet so I don't need to send it
*/
LASSERT(msg->ksm_zc_cookies[1] != 0);
LASSERT(conn->ksnc_proto->pro_queue_tx_zcack != NULL);
if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0))
ztx = tx; /* ZC ACK piggybacked on ztx release tx later */
} else {
/* It's a normal packet - can it piggback a noop zc-ack that
* has been queued already?
*/
LASSERT(msg->ksm_zc_cookies[1] == 0);
LASSERT(conn->ksnc_proto->pro_queue_tx_msg != NULL);
ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx);
/* ztx will be released later */
}
if (ztx != NULL) {
atomic_sub(ztx->tx_nob, &conn->ksnc_tx_nob);
list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs);
}
if (conn->ksnc_tx_ready && /* able to send */
!conn->ksnc_tx_scheduled) { /* not scheduled to send */
/* +1 ref for scheduler */
ksocknal_conn_addref(conn);
list_add_tail(&conn->ksnc_tx_list,
&sched->kss_tx_conns);
conn->ksnc_tx_scheduled = 1;
wake_up(&sched->kss_waitq);
}
spin_unlock_bh(&sched->kss_lock);
}
struct ksock_conn_cb *
ksocknal_find_connectable_conn_cb_locked(struct ksock_peer_ni *peer_ni)
{
time64_t now = ktime_get_seconds();
struct ksock_conn_cb *conn_cb;
conn_cb = peer_ni->ksnp_conn_cb;
if (!conn_cb)
return NULL;
LASSERT(!conn_cb->ksnr_connecting || conn_cb->ksnr_scheduled);
if (conn_cb->ksnr_scheduled) /* connections being established */
return NULL;
/* all conn types connected ? */
if ((ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected) == 0)
return NULL;
if (!(conn_cb->ksnr_retry_interval == 0 || /* first attempt */
now >= conn_cb->ksnr_timeout)) {
CDEBUG(D_NET,
"Too soon to retry route %pISc (cnted %d, interval %lld, %lld secs later)\n",
&conn_cb->ksnr_addr,
conn_cb->ksnr_connected,
conn_cb->ksnr_retry_interval,
conn_cb->ksnr_timeout - now);
return NULL;
}
return conn_cb;
}
struct ksock_conn_cb *
ksocknal_find_connecting_conn_cb_locked(struct ksock_peer_ni *peer_ni)
{
struct ksock_conn_cb *conn_cb;
conn_cb = peer_ni->ksnp_conn_cb;
if (!conn_cb)
return NULL;
LASSERT(!conn_cb->ksnr_connecting || conn_cb->ksnr_scheduled);
return conn_cb->ksnr_scheduled ? conn_cb : NULL;
}
int
ksocknal_launch_packet(struct lnet_ni *ni, struct ksock_tx *tx,
struct lnet_processid *id)
{
struct ksock_peer_ni *peer_ni;
struct ksock_conn *conn;
struct sockaddr_storage sa;
rwlock_t *g_lock;
int retry;
int rc;
int port = lnet_acceptor_port();
LASSERT(tx->tx_conn == NULL);
g_lock = &ksocknal_data.ksnd_global_lock;
for (retry = 0;; retry = 1) {
read_lock(g_lock);
peer_ni = ksocknal_find_peer_locked(ni, id);
if (peer_ni != NULL) {
if (ksocknal_find_connectable_conn_cb_locked(peer_ni) == NULL) {
conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
if (conn != NULL) {
/* I've got nothing that need to be
* connecting and I do have an actual
* connection...
*/
ksocknal_queue_tx_locked(tx, conn);
read_unlock(g_lock);
return 0;
}
}
}
/* I'll need a write lock... */
read_unlock(g_lock);
write_lock_bh(g_lock);
peer_ni = ksocknal_find_peer_locked(ni, id);
if (peer_ni != NULL)
break;
write_unlock_bh(g_lock);
if ((id->pid & LNET_PID_USERFLAG) != 0) {
CERROR("Refusing to create a connection to userspace process %s\n",
libcfs_idstr(id));
return -EHOSTUNREACH;
}
if (retry) {
CERROR("Can't find peer_ni %s\n", libcfs_idstr(id));
return -EHOSTUNREACH;
}
memset(&sa, 0, sizeof(sa));
switch (NID_ADDR_BYTES(&id->nid)) {
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
case 4:
sin = (void *)&sa;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = id->nid.nid_addr[0];
sin->sin_port = htons(port);
break;
case 16:
sin6 = (void *)&sa;
sin6->sin6_family = AF_INET6;
memcpy(&sin6->sin6_addr, id->nid.nid_addr,
sizeof(sin6->sin6_addr));
sin6->sin6_port = htons(port);
break;
}
rc = ksocknal_add_peer(ni, id, (struct sockaddr *)&sa);
if (rc != 0) {
CERROR("Can't add peer_ni %s: %d\n",
libcfs_idstr(id), rc);
return rc;
}
}
ksocknal_launch_all_connections_locked(peer_ni);
conn = ksocknal_find_conn_locked(peer_ni, tx, tx->tx_nonblk);
if (conn != NULL) {
/* Connection exists; queue message on it */
ksocknal_queue_tx_locked(tx, conn);
write_unlock_bh(g_lock);
return 0;
}
if (peer_ni->ksnp_accepting > 0 ||
ksocknal_find_connecting_conn_cb_locked(peer_ni) != NULL) {
/* the message is going to be pinned to the peer_ni */
tx->tx_deadline = ktime_get_seconds() +
ksocknal_timeout();
/* Queue the message until a connection is established */
list_add_tail(&tx->tx_list, &peer_ni->ksnp_tx_queue);
write_unlock_bh(g_lock);
return 0;
}
write_unlock_bh(g_lock);
/* NB Routes may be ignored if connections to them failed recently */
CNETERR("No usable routes to %s\n", libcfs_idstr(id));
tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
return -EHOSTUNREACH;
}
int
ksocknal_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
{
/* '1' for consistency with code that checks !mpflag to restore */
unsigned int mpflag = 1;
int type = lntmsg->msg_type;
struct lnet_processid *target = &lntmsg->msg_target;
unsigned int payload_niov = lntmsg->msg_niov;
struct bio_vec *payload_kiov = lntmsg->msg_kiov;
unsigned int payload_offset = lntmsg->msg_offset;
unsigned int payload_nob = lntmsg->msg_len;
struct ksock_tx *tx;
int desc_size;
int rc;
/* NB 'private' is different depending on what we're sending.
* Just ignore it...
*/
CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n",
payload_nob, payload_niov, libcfs_idstr(target));
LASSERT(payload_nob == 0 || payload_niov > 0);
LASSERT(!in_interrupt());
desc_size = offsetof(struct ksock_tx,
tx_payload[payload_niov]);
if (lntmsg->msg_vmflush)
mpflag = memalloc_noreclaim_save();
tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size);
if (tx == NULL) {
CERROR("Can't allocate tx desc type %d size %d\n",
type, desc_size);
if (lntmsg->msg_vmflush)
memalloc_noreclaim_restore(mpflag);
return -ENOMEM;
}
tx->tx_conn = NULL; /* set when assigned a conn */
tx->tx_lnetmsg = lntmsg;
tx->tx_niov = 1;
tx->tx_kiov = tx->tx_payload;
tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
payload_niov, payload_kiov,
payload_offset, payload_nob);
LASSERT(tx->tx_nkiov <= LNET_MAX_IOV);
if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload) {
int i;
tx->tx_zc_capable = 1;
for (i = 0; i < tx->tx_nkiov; i++) {
if (!sendpage_ok(tx->tx_kiov[i].bv_page)) {
tx->tx_zc_capable = 0;
break;
}
}
}
tx->tx_msg.ksm_csum = 0;
tx->tx_msg.ksm_type = KSOCK_MSG_LNET;
tx->tx_msg.ksm_zc_cookies[0] = 0;
tx->tx_msg.ksm_zc_cookies[1] = 0;
/* The first fragment will be set later in pro_pack */
rc = ksocknal_launch_packet(ni, tx, target);
/* We can't test lntsmg->msg_vmflush again as lntmsg may
* have been freed.
*/
if (!mpflag)
memalloc_noreclaim_restore(mpflag);
if (rc == 0)
return 0;
lntmsg->msg_health_status = tx->tx_hstatus;
ksocknal_free_tx(tx);
return -EIO;
}
void
ksocknal_thread_fini(void)
{
if (atomic_dec_and_test(&ksocknal_data.ksnd_nthreads))
wake_up_var(&ksocknal_data.ksnd_nthreads);
}
int
ksocknal_new_packet(struct ksock_conn *conn, int nob_to_skip)
{
static char ksocknal_slop_buffer[4096];
struct kvec *kvec = conn->ksnc_rx_iov_space;
int nob;
unsigned int niov;
int skipped;
LASSERT(conn->ksnc_proto != NULL);
if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) {
/* Remind the socket to ack eagerly... */
ksocknal_lib_eager_ack(conn);
}
if (nob_to_skip == 0) { /* right at next packet boundary now */
conn->ksnc_rx_started = 0;
smp_mb(); /* racing with timeout thread */
switch (conn->ksnc_proto->pro_version) {
case KSOCK_PROTO_V2:
case KSOCK_PROTO_V3:
case KSOCK_PROTO_V4:
conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
conn->ksnc_rx_nob_left = sizeof(struct ksock_msg_hdr);
kvec->iov_base = &conn->ksnc_msg;
kvec->iov_len = conn->ksnc_rx_nob_left;
iov_iter_kvec(&conn->ksnc_rx_to, READ, kvec, 1,
kvec->iov_len);
break;
case KSOCK_PROTO_V1:
/* Receiving bare struct lnet_hdr_nid4 */
conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
conn->ksnc_rx_nob_left = sizeof(struct lnet_hdr_nid4);
kvec->iov_base = &conn->ksnc_msg.ksm_u.lnetmsg_nid4;
kvec->iov_len = conn->ksnc_rx_nob_left;
iov_iter_kvec(&conn->ksnc_rx_to, READ, kvec, 1,
kvec->iov_len);
break;
default:
LBUG();
}
conn->ksnc_rx_csum = ~0;
return 1;
}
/* Set up to skip as much as possible now. If there's more left
* (ran out of iov entries) we'll get called again
*/
conn->ksnc_rx_state = SOCKNAL_RX_SLOP;
conn->ksnc_rx_nob_left = nob_to_skip;
skipped = 0;
niov = 0;
do {
nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
kvec[niov].iov_base = ksocknal_slop_buffer;
kvec[niov].iov_len = nob;
niov++;
skipped += nob;
nob_to_skip -= nob;
} while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
niov < ARRAY_SIZE(conn->ksnc_rx_iov_space));
iov_iter_kvec(&conn->ksnc_rx_to, READ, kvec, niov, skipped);
return 0;
}
static int
ksocknal_process_receive(struct ksock_conn *conn)
{
struct kvec *kvec = conn->ksnc_rx_iov_space;
struct lnet_processid *id;
struct lnet_hdr hdr;
int rc;
LASSERT(refcount_read(&conn->ksnc_conn_refcount) > 0);
/* NB: sched lock NOT held */
/* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */
LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER ||
conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD ||
conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER ||
conn->ksnc_rx_state == SOCKNAL_RX_SLOP);
again:
if (iov_iter_count(&conn->ksnc_rx_to)) {
rc = ksocknal_receive(conn);
if (rc <= 0) {
struct lnet_processid *ksnp_id;
ksnp_id = &conn->ksnc_peer->ksnp_id;
LASSERT(rc != -EAGAIN);
if (rc == 0)
CDEBUG(D_NET, "[%p] EOF from %s ip %pIScp\n",
conn, libcfs_idstr(ksnp_id),
&conn->ksnc_peeraddr);
else if (!conn->ksnc_closing)
CERROR("[%p] Error %d on read from %s ip %pIScp\n",
conn, rc, libcfs_idstr(ksnp_id),
&conn->ksnc_peeraddr);
/* it's not an error if conn is being closed */
ksocknal_close_conn_and_siblings(conn,
(conn->ksnc_closing) ? 0 : rc);
return (rc == 0 ? -ESHUTDOWN : rc);
}
if (iov_iter_count(&conn->ksnc_rx_to)) {
/* short read */
return -EAGAIN;
}
}
switch (conn->ksnc_rx_state) {
case SOCKNAL_RX_KSM_HEADER:
if (conn->ksnc_flip) {
__swab32s(&conn->ksnc_msg.ksm_type);
__swab32s(&conn->ksnc_msg.ksm_csum);
__swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]);
__swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]);
}
if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP &&
conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
/* NOOP Checksum error */
CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
libcfs_idstr(&conn->ksnc_peer->ksnp_id),
conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
ksocknal_new_packet(conn, 0);
ksocknal_close_conn_and_siblings(conn, -EPROTO);
return -EIO;
}
if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) {
__u64 cookie = 0;
LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP)
cookie = conn->ksnc_msg.ksm_zc_cookies[0];
rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie,
conn->ksnc_msg.ksm_zc_cookies[1]);
if (rc != 0) {
CERROR("%s: Unknown ZC-ACK cookie: %llu, %llu\n",
libcfs_idstr(&conn->ksnc_peer->ksnp_id),
cookie,
conn->ksnc_msg.ksm_zc_cookies[1]);
ksocknal_new_packet(conn, 0);
ksocknal_close_conn_and_siblings(conn, -EPROTO);
return rc;
}
}
switch (conn->ksnc_msg.ksm_type) {
case KSOCK_MSG_NOOP:
ksocknal_new_packet(conn, 0);
return 0; /* NOOP is done and just return */
case KSOCK_MSG_LNET: {
int msg_len = sizeof(struct lnet_hdr_nid4);
if (conn->ksnc_proto->pro_version == KSOCK_PROTO_V4)
msg_len = sizeof(struct lnet_hdr_nid16);
conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
conn->ksnc_rx_nob_left = msg_len;
if (conn->ksnc_proto->pro_version == KSOCK_PROTO_V4)
kvec->iov_base =
&conn->ksnc_msg.ksm_u.lnetmsg_nid16;
else
kvec->iov_base =
&conn->ksnc_msg.ksm_u.lnetmsg_nid4;
kvec->iov_len = conn->ksnc_rx_nob_left;
iov_iter_kvec(&conn->ksnc_rx_to, READ, kvec, 1,
kvec->iov_len);
goto again; /* read lnet header now */
}
default:
CERROR("%s: Unknown message type: %x\n",
libcfs_idstr(&conn->ksnc_peer->ksnp_id),
conn->ksnc_msg.ksm_type);
ksocknal_new_packet(conn, 0);
ksocknal_close_conn_and_siblings(conn, -EPROTO);
return -EPROTO;
}
case SOCKNAL_RX_LNET_HEADER:
/* unpack message header */
conn->ksnc_proto->pro_unpack(&conn->ksnc_msg, &hdr);
if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
/* Userspace peer_ni */
id = &conn->ksnc_peer->ksnp_id;
/* Substitute process ID assigned at connection time */
hdr.src_pid = id->pid;
hdr.src_nid = id->nid;
}
conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
ksocknal_conn_addref(conn); /* ++ref while parsing */
rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
&hdr,
&conn->ksnc_peer->ksnp_id.nid,
conn, 0);
if (rc < 0) {
/* I just received garbage: give up on this conn */
ksocknal_new_packet(conn, 0);
ksocknal_close_conn_and_siblings(conn, rc);
ksocknal_conn_decref(conn);
return -EPROTO;
}
/* I'm racing with ksocknal_recv() */
LASSERT(conn->ksnc_rx_state == SOCKNAL_RX_PARSE ||
conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD);
if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD)
return 0;
/* ksocknal_recv() got called */
goto again;
case SOCKNAL_RX_LNET_PAYLOAD:
/* payload all received */
rc = 0;
if (conn->ksnc_rx_nob_left == 0 && /* not truncating */
conn->ksnc_msg.ksm_csum != 0 && /* has checksum */
conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) {
CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n",
libcfs_idstr(&conn->ksnc_peer->ksnp_id),
conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum);
rc = -EIO;
}
if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) {
LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x);
if (conn->ksnc_proto->pro_version == KSOCK_PROTO_V4)
lnet_hdr_from_nid16(&hdr,
&conn->ksnc_msg.ksm_u.lnetmsg_nid16);
else
lnet_hdr_from_nid4(&hdr,
&conn->ksnc_msg.ksm_u.lnetmsg_nid4);
id = &conn->ksnc_peer->ksnp_id;
rc = conn->ksnc_proto->pro_handle_zcreq(
conn,
conn->ksnc_msg.ksm_zc_cookies[0],
*ksocknal_tunables.ksnd_nonblk_zcack ||
!nid_same(&hdr.src_nid, &id->nid));
}
if (rc && conn->ksnc_lnet_msg)
conn->ksnc_lnet_msg->msg_health_status =
LNET_MSG_STATUS_REMOTE_ERROR;
lnet_finalize(conn->ksnc_lnet_msg, rc);
if (rc != 0) {
ksocknal_new_packet(conn, 0);
ksocknal_close_conn_and_siblings(conn, rc);
return -EPROTO;
}
fallthrough;
case SOCKNAL_RX_SLOP:
/* starting new packet? */
if (ksocknal_new_packet(conn, conn->ksnc_rx_nob_left))
return 0; /* come back later */
goto again; /* try to finish reading slop now */
default:
break;
}
/* Not Reached */
LBUG();
return -EINVAL; /* keep gcc happy */
}
int
ksocknal_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
int delayed, struct iov_iter *to, unsigned int rlen)
{
struct ksock_conn *conn = private;
struct ksock_sched *sched = conn->ksnc_scheduler;
LASSERT(iov_iter_count(to) <= rlen);
LASSERT(to->nr_segs <= LNET_MAX_IOV);
conn->ksnc_lnet_msg = msg;
conn->ksnc_rx_nob_left = rlen;
conn->ksnc_rx_to = *to;
LASSERT(conn->ksnc_rx_scheduled);
spin_lock_bh(&sched->kss_lock);
switch (conn->ksnc_rx_state) {
case SOCKNAL_RX_PARSE_WAIT:
list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns);
wake_up(&sched->kss_waitq);
LASSERT(conn->ksnc_rx_ready);
break;
case SOCKNAL_RX_PARSE:
/* scheduler hasn't noticed I'm parsing yet */
break;
}
conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD;
spin_unlock_bh(&sched->kss_lock);
ksocknal_conn_decref(conn);
return 0;
}
static inline int
ksocknal_sched_cansleep(struct ksock_sched *sched)
{
int rc;
spin_lock_bh(&sched->kss_lock);
rc = (!ksocknal_data.ksnd_shuttingdown &&
list_empty(&sched->kss_rx_conns) &&
list_empty(&sched->kss_tx_conns));
spin_unlock_bh(&sched->kss_lock);
return rc;
}
int ksocknal_scheduler(void *arg)
{
struct ksock_sched *sched;
struct ksock_conn *conn;
struct ksock_tx *tx;
int rc;
long id = (long)arg;
sched = ksocknal_data.ksnd_schedulers[KSOCK_THREAD_CPT(id)];
rc = cfs_cpt_bind(lnet_cpt_table(), sched->kss_cpt);
if (rc != 0) {
CWARN("Can't set CPU partition affinity to %d: %d\n",
sched->kss_cpt, rc);
}
spin_lock_bh(&sched->kss_lock);
while (!ksocknal_data.ksnd_shuttingdown) {
bool did_something = false;
/* Ensure I progress everything semi-fairly */
conn = list_first_entry_or_null(&sched->kss_rx_conns,
struct ksock_conn,
ksnc_rx_list);
if (conn) {
list_del(&conn->ksnc_rx_list);
LASSERT(conn->ksnc_rx_scheduled);
LASSERT(conn->ksnc_rx_ready);
/* clear rx_ready in case receive isn't complete.
* Do it BEFORE we call process_recv, since
* data_ready can set it any time after we release
* kss_lock.
*/
conn->ksnc_rx_ready = 0;
spin_unlock_bh(&sched->kss_lock);
rc = ksocknal_process_receive(conn);
spin_lock_bh(&sched->kss_lock);
/* I'm the only one that can clear this flag */
LASSERT(conn->ksnc_rx_scheduled);
/* Did process_receive get everything it wanted? */
if (rc == 0)
conn->ksnc_rx_ready = 1;
if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) {
/* Conn blocked waiting for ksocknal_recv()
* I change its state (under lock) to signal
* it can be rescheduled
*/
conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT;
} else if (conn->ksnc_rx_ready) {
/* reschedule for rx */
list_add_tail(&conn->ksnc_rx_list,
&sched->kss_rx_conns);
} else {
conn->ksnc_rx_scheduled = 0;
/* drop my ref */
ksocknal_conn_decref(conn);
}
did_something = true;
}
if (!list_empty(&sched->kss_tx_conns)) {
LIST_HEAD(zlist);
list_splice_init(&sched->kss_zombie_noop_txs, &zlist);
conn = list_first_entry(&sched->kss_tx_conns,
struct ksock_conn,
ksnc_tx_list);
list_del(&conn->ksnc_tx_list);
LASSERT(conn->ksnc_tx_scheduled);
LASSERT(conn->ksnc_tx_ready);
LASSERT(!list_empty(&conn->ksnc_tx_queue));
tx = list_first_entry(&conn->ksnc_tx_queue,
struct ksock_tx, tx_list);
if (conn->ksnc_tx_carrier == tx)
ksocknal_next_tx_carrier(conn);
/* dequeue now so empty list => more to send */
list_del(&tx->tx_list);
/* Clear tx_ready in case send isn't complete. Do
* it BEFORE we call process_transmit, since
* write_space can set it any time after we release
* kss_lock.
*/
conn->ksnc_tx_ready = 0;
spin_unlock_bh(&sched->kss_lock);
if (!list_empty(&zlist)) {
/* free zombie noop txs, it's fast because
* noop txs are just put in freelist
*/
ksocknal_txlist_done(NULL, &zlist, 0);
}
rc = ksocknal_process_transmit(conn, tx);
if (rc == -ENOMEM || rc == -EAGAIN) {
/* Incomplete send: replace tx on HEAD of
* tx_queue
*/
spin_lock_bh(&sched->kss_lock);
list_add(&tx->tx_list,
&conn->ksnc_tx_queue);
} else {
/* Complete send; tx -ref */
ksocknal_tx_decref(tx);
spin_lock_bh(&sched->kss_lock);
/* assume space for more */
conn->ksnc_tx_ready = 1;
}
if (rc == -ENOMEM) {
/* Do nothing; after a short timeout, this
* conn will be reposted on kss_tx_conns.
*/
} else if (conn->ksnc_tx_ready &&
!list_empty(&conn->ksnc_tx_queue)) {
/* reschedule for tx */
list_add_tail(&conn->ksnc_tx_list,
&sched->kss_tx_conns);
} else {
conn->ksnc_tx_scheduled = 0;
/* drop my ref */
ksocknal_conn_decref(conn);
}
did_something = true;
}
if (!did_something || /* nothing to do */
need_resched()) { /* hogging CPU? */
spin_unlock_bh(&sched->kss_lock);
if (!did_something) { /* wait for something to do */
rc = wait_event_interruptible_exclusive(
sched->kss_waitq,
!ksocknal_sched_cansleep(sched));
LASSERT(rc == 0);
} else {
cond_resched();
}
spin_lock_bh(&sched->kss_lock);
}
}
spin_unlock_bh(&sched->kss_lock);
ksocknal_thread_fini();
return 0;
}
/* Add connection to kss_rx_conns of scheduler
* and wakeup the scheduler.
*/
void ksocknal_read_callback(struct ksock_conn *conn)
{
struct ksock_sched *sched;
sched = conn->ksnc_scheduler;
spin_lock_bh(&sched->kss_lock);
conn->ksnc_rx_ready = 1;
if (!conn->ksnc_rx_scheduled) { /* not being progressed */
list_add_tail(&conn->ksnc_rx_list,
&sched->kss_rx_conns);
conn->ksnc_rx_scheduled = 1;
/* extra ref for scheduler */
ksocknal_conn_addref(conn);
wake_up(&sched->kss_waitq);
}
spin_unlock_bh(&sched->kss_lock);
}
/* Add connection to kss_tx_conns of scheduler
* and wakeup the scheduler.
*/
void ksocknal_write_callback(struct ksock_conn *conn)
{
struct ksock_sched *sched;
sched = conn->ksnc_scheduler;
spin_lock_bh(&sched->kss_lock);
conn->ksnc_tx_ready = 1;
if (!conn->ksnc_tx_scheduled && /* not being progressed */
!list_empty(&conn->ksnc_tx_queue)) { /* packets to send */
list_add_tail(&conn->ksnc_tx_list, &sched->kss_tx_conns);
conn->ksnc_tx_scheduled = 1;
/* extra ref for scheduler */
ksocknal_conn_addref(conn);
wake_up(&sched->kss_waitq);
}
spin_unlock_bh(&sched->kss_lock);
}
static const struct ksock_proto *
ksocknal_parse_proto_version(struct ksock_hello_msg *hello)
{
__u32 version = 0;
if (hello->kshm_magic == LNET_PROTO_MAGIC)
version = hello->kshm_version;
else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC))
version = __swab32(hello->kshm_version);
if (version) {
#if SOCKNAL_VERSION_DEBUG
if (*ksocknal_tunables.ksnd_protocol == 1)
return NULL;
if (*ksocknal_tunables.ksnd_protocol == 2 &&
version == KSOCK_PROTO_V3)
return NULL;
#endif
if (version == KSOCK_PROTO_V2)
return &ksocknal_protocol_v2x;
if (version == KSOCK_PROTO_V3)
return &ksocknal_protocol_v3x;
if (version == KSOCK_PROTO_V4)
return &ksocknal_protocol_v4x;
return NULL;
}
if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
struct lnet_magicversion *hmv;
BUILD_BUG_ON(sizeof(struct lnet_magicversion) !=
offsetof(struct ksock_hello_msg, kshm_src_nid));
hmv = (struct lnet_magicversion *)hello;
if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) &&
hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR))
return &ksocknal_protocol_v1x;
}
return NULL;
}
int
ksocknal_send_hello(struct lnet_ni *ni, struct ksock_conn *conn,
struct lnet_nid *peer_nid, struct ksock_hello_msg *hello)
{
/* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
struct ksock_net *net = (struct ksock_net *)ni->ni_data;
LASSERT(hello->kshm_nips <= LNET_INTERFACES_NUM);
/* rely on caller to hold a ref on socket so it wouldn't disappear */
LASSERT(conn->ksnc_proto != NULL);
hello->kshm_src_nid = ni->ni_nid;
hello->kshm_dst_nid = *peer_nid;
hello->kshm_src_pid = the_lnet.ln_pid;
hello->kshm_src_incarnation = net->ksnn_incarnation;
hello->kshm_ctype = conn->ksnc_type;
return conn->ksnc_proto->pro_send_hello(conn, hello);
}
static int
ksocknal_invert_type(int type)
{
switch (type) {
case SOCKLND_CONN_ANY:
case SOCKLND_CONN_CONTROL:
return type;
case SOCKLND_CONN_BULK_IN:
return SOCKLND_CONN_BULK_OUT;
case SOCKLND_CONN_BULK_OUT:
return SOCKLND_CONN_BULK_IN;
default:
return SOCKLND_CONN_NONE;
}
}
int
ksocknal_recv_hello(struct lnet_ni *ni, struct ksock_conn *conn,
struct ksock_hello_msg *hello,
struct lnet_processid *peerid,
__u64 *incarnation)
{
/* Return < 0 fatal error
* 0 success
* EALREADY lost connection race
* EPROTO protocol version mismatch
*/
struct socket *sock = conn->ksnc_sock;
int active = (conn->ksnc_proto != NULL);
int timeout;
int proto_match;
int rc;
const struct ksock_proto *proto;
struct lnet_processid recv_id;
/* socket type set on active connections - not set on passive */
LASSERT(!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
timeout = active ? ksocknal_timeout() :
lnet_acceptor_timeout();
rc = lnet_sock_read(sock, &hello->kshm_magic,
sizeof(hello->kshm_magic), timeout);
if (rc != 0) {
CERROR("Error %d reading HELLO from %pISc\n",
rc, &conn->ksnc_peeraddr);
LASSERT(rc < 0);
goto out_fatal;
}
if (hello->kshm_magic != LNET_PROTO_MAGIC &&
hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) &&
hello->kshm_magic != le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
/* Unexpected magic! */
CERROR("Bad magic(1) %#08x (%#08x expected) from %pISc\n",
__cpu_to_le32 (hello->kshm_magic),
LNET_PROTO_TCP_MAGIC, &conn->ksnc_peeraddr);
goto out_unknown;
}
rc = lnet_sock_read(sock, &hello->kshm_version,
sizeof(hello->kshm_version), timeout);
if (rc != 0) {
CERROR("Error %d reading HELLO from %pISc\n",
rc, &conn->ksnc_peeraddr);
LASSERT(rc < 0);
goto out_fatal;
}
proto = ksocknal_parse_proto_version(hello);
if (proto == NULL) {
if (!active) {
struct sockaddr_in *psa = (void *)&conn->ksnc_peeraddr;
/* unknown protocol from peer_ni,
* tell peer_ni my protocol.
*/
if (psa->sin_family == AF_INET6)
conn->ksnc_proto = &ksocknal_protocol_v4x;
else if (psa->sin_family == AF_INET)
conn->ksnc_proto = &ksocknal_protocol_v3x;
#if SOCKNAL_VERSION_DEBUG
if (*ksocknal_tunables.ksnd_protocol == 2)
conn->ksnc_proto = &ksocknal_protocol_v2x;
else if (*ksocknal_tunables.ksnd_protocol == 1)
conn->ksnc_proto = &ksocknal_protocol_v1x;
#endif
if (!conn->ksnc_proto) {
CERROR("Unknown protocol.Error reading HELLO from %pISc\n",
&conn->ksnc_peeraddr);
goto out_unknown;
}
hello->kshm_nips = 0;
ksocknal_send_hello(ni, conn, &ni->ni_nid,
hello);
}
CERROR("Unknown protocol version (%d.x expected) from %pISc\n",
conn->ksnc_proto->pro_version, &conn->ksnc_peeraddr);
out_unknown:
rc = -EPROTO;
out_fatal:
return rc;
}
proto_match = (conn->ksnc_proto == proto);
conn->ksnc_proto = proto;
/* receive the rest of hello message anyway */
rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout);
if (rc != 0) {
CERROR("Error %d reading or checking hello from %pISc\n",
rc, &conn->ksnc_peeraddr);
LASSERT(rc < 0);
return rc;
}
*incarnation = hello->kshm_src_incarnation;
if (LNET_NID_IS_ANY(&hello->kshm_src_nid)) {
CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pISc\n",
&conn->ksnc_peeraddr);
return -EPROTO;
}
if (!active &&
rpc_get_port((struct sockaddr *)&conn->ksnc_peeraddr) >
LNET_ACCEPTOR_MAX_RESERVED_PORT) {
/* Userspace NAL assigns peer_ni process ID from socket */
recv_id.pid = rpc_get_port((struct sockaddr *)
&conn->ksnc_peeraddr) |
LNET_PID_USERFLAG;
LASSERT(conn->ksnc_peeraddr.ss_family == AF_INET);
memset(&recv_id.nid, 0, sizeof(recv_id.nid));
recv_id.nid.nid_type = ni->ni_nid.nid_type;
recv_id.nid.nid_num = ni->ni_nid.nid_num;
recv_id.nid.nid_addr[0] =
((struct sockaddr_in *)
&conn->ksnc_peeraddr)->sin_addr.s_addr;
} else {
recv_id.nid = hello->kshm_src_nid;
recv_id.pid = hello->kshm_src_pid;
}
if (!active) {
*peerid = recv_id;
/* peer_ni determines type */
conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype);
if (conn->ksnc_type == SOCKLND_CONN_NONE) {
CERROR("Unexpected type %d from %s ip %pISc\n",
hello->kshm_ctype, libcfs_idstr(peerid),
&conn->ksnc_peeraddr);
return -EPROTO;
}
return 0;
}
if (peerid->pid != recv_id.pid ||
!nid_same(&peerid->nid, &recv_id.nid)) {
LCONSOLE_ERROR("Connected successfully to %s on host %pISc, but they claimed they were %s; please check your Lustre configuration.\n",
libcfs_idstr(peerid),
&conn->ksnc_peeraddr,
libcfs_idstr(&recv_id));
return -EPROTO;
}
if (hello->kshm_ctype == SOCKLND_CONN_NONE) {
/* Possible protocol mismatch or I lost the connection race */
return proto_match ? EALREADY : EPROTO;
}
if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) {
CERROR("Mismatched types: me %d, %s ip %pISc %d\n",
conn->ksnc_type, libcfs_idstr(peerid),
&conn->ksnc_peeraddr,
hello->kshm_ctype);
return -EPROTO;
}
return 0;
}
static bool
ksocknal_connect(struct ksock_conn_cb *conn_cb)
{
LIST_HEAD(zombies);
struct ksock_peer_ni *peer_ni = conn_cb->ksnr_peer;
int type = SOCKLND_CONN_NONE;
int wanted;
struct socket *sock;
time64_t deadline;
bool retry_later = false;
int rc = 0;
struct ksock_net *net;
deadline = ktime_get_seconds() + ksocknal_timeout();
write_lock_bh(&ksocknal_data.ksnd_global_lock);
LASSERT(conn_cb->ksnr_scheduled);
LASSERT(!conn_cb->ksnr_connecting);
conn_cb->ksnr_connecting = 1;
for (;;) {
wanted = ksocknal_conn_cb_mask() & ~conn_cb->ksnr_connected;
/* stop connecting if peer_ni/cb got closed under me, or
* conn cb got connected while queued
*/
if (peer_ni->ksnp_closing || conn_cb->ksnr_deleted ||
wanted == 0) {
retry_later = false;
break;
}
/* reschedule if peer_ni is connecting to me */
if (peer_ni->ksnp_accepting > 0) {
CDEBUG(D_NET,
"peer_ni %s(%d) already connecting to me, retry later.\n",
libcfs_nidstr(&peer_ni->ksnp_id.nid),
peer_ni->ksnp_accepting);
retry_later = true;
}
if (retry_later) /* needs reschedule */
break;
if ((wanted & BIT(SOCKLND_CONN_ANY)) != 0) {
type = SOCKLND_CONN_ANY;
} else if ((wanted & BIT(SOCKLND_CONN_CONTROL)) != 0) {
type = SOCKLND_CONN_CONTROL;
} else if ((wanted & BIT(SOCKLND_CONN_BULK_IN)) != 0 &&
conn_cb->ksnr_blki_conn_count <= conn_cb->ksnr_blko_conn_count) {
type = SOCKLND_CONN_BULK_IN;
} else {
LASSERT((wanted & BIT(SOCKLND_CONN_BULK_OUT)) != 0);
type = SOCKLND_CONN_BULK_OUT;
}
write_unlock_bh(&ksocknal_data.ksnd_global_lock);
if (ktime_get_seconds() >= deadline) {
rc = -ETIMEDOUT;
lnet_connect_console_error(
rc, &peer_ni->ksnp_id.nid,
(struct sockaddr *)&conn_cb->ksnr_addr);
goto failed_nolock;
}
net = (struct ksock_net *)(peer_ni->ksnp_ni->ni_data);
sock = lnet_connect(&peer_ni->ksnp_id.nid,
net->ksnn_interface.ksni_index,
(struct sockaddr *)&conn_cb->ksnr_addr,
peer_ni->ksnp_ni->ni_net_ns,
type == SOCKLND_CONN_CONTROL);
if (IS_ERR(sock)) {
rc = PTR_ERR(sock);
goto failed_nolock;
}
rc = ksocknal_create_conn(peer_ni->ksnp_ni, conn_cb, sock,
type);
if (rc < 0) {
lnet_connect_console_error(
rc, &peer_ni->ksnp_id.nid,
(struct sockaddr *)&conn_cb->ksnr_addr);
goto failed_nolock;
} else if (rc > 0) {
/* A +ve RC means I have to retry because I lost the connection
* race or I have to renegotiate protocol version
*/
conn_cb->ksnr_retry_count++;
retry_later = true;
} else {
conn_cb->ksnr_retry_count = 0;
}
if (retry_later)
CDEBUG(D_NET, "peer_ni %s: conn race, retry later. rc %d\n",
libcfs_nidstr(&peer_ni->ksnp_id.nid), rc);
write_lock_bh(&ksocknal_data.ksnd_global_lock);
}
conn_cb->ksnr_scheduled = 0;
conn_cb->ksnr_connecting = 0;
if (conn_cb->ksnr_retry_count >= SOCKNAL_MAX_RETRIES &&
type > SOCKLND_CONN_NONE) {
/* After so many retries due to EALREADY assume that
* the peer doesn't support as many connections as we want
*/
if (conn_cb->ksnr_blki_conn_count &&
conn_cb->ksnr_blko_conn_count &&
conn_cb->ksnr_ctrl_conn_count) {
/* Don't create any more connections of any type */
conn_cb->ksnr_connected |= (BIT(SOCKLND_CONN_CONTROL) |
BIT(SOCKLND_CONN_BULK_IN) |
BIT(SOCKLND_CONN_BULK_OUT));
} else {
/* If don't have at least one connection of each
* type, fail
*/
goto failed;
}
retry_later = false;
}
if (retry_later) {
/* re-queue for attention; this frees me up to handle
* the peer_ni's incoming connection request
*/
if (rc == EALREADY ||
(rc == 0 && peer_ni->ksnp_accepting > 0)) {
/* We want to introduce a delay before next
* attempt to connect if we lost conn race, but
* the race is resolved quickly usually, so
* min_reconnectms should be good heuristic
*/
conn_cb->ksnr_retry_interval =
*ksocknal_tunables.ksnd_min_reconnectms / 1000;
conn_cb->ksnr_timeout = ktime_get_seconds() +
conn_cb->ksnr_retry_interval;
}
ksocknal_launch_connection_locked(conn_cb);
}
write_unlock_bh(&ksocknal_data.ksnd_global_lock);
return retry_later;
failed_nolock:
write_lock_bh(&ksocknal_data.ksnd_global_lock);
failed:
conn_cb->ksnr_scheduled = 0;
conn_cb->ksnr_connecting = 0;
/* This is a retry rather than a new connection */
conn_cb->ksnr_retry_interval *= 2;
conn_cb->ksnr_retry_interval =
max_t(time64_t, conn_cb->ksnr_retry_interval,
*ksocknal_tunables.ksnd_min_reconnectms / 1000);
conn_cb->ksnr_retry_interval =
min_t(time64_t, conn_cb->ksnr_retry_interval,
*ksocknal_tunables.ksnd_max_reconnectms / 1000);
LASSERT(conn_cb->ksnr_retry_interval);
conn_cb->ksnr_timeout = ktime_get_seconds() +
conn_cb->ksnr_retry_interval;
if (!list_empty(&peer_ni->ksnp_tx_queue) &&
peer_ni->ksnp_accepting == 0 &&
!ksocknal_find_connecting_conn_cb_locked(peer_ni)) {
struct ksock_conn *conn;
/* ksnp_tx_queue is queued on a conn on successful
* connection for V1.x and V2.x
*/
conn = list_first_entry_or_null(&peer_ni->ksnp_conns,
struct ksock_conn, ksnc_list);
if (conn)
LASSERT(conn->ksnc_proto == &ksocknal_protocol_v3x ||
conn->ksnc_proto == &ksocknal_protocol_v4x);
/* take all the blocked packets while I've got the lock and
* complete below...
*/
list_splice_init(&peer_ni->ksnp_tx_queue, &zombies);
}
write_unlock_bh(&ksocknal_data.ksnd_global_lock);
ksocknal_peer_failed(peer_ni);
ksocknal_txlist_done(peer_ni->ksnp_ni, &zombies, rc);
return 0;
}
/* check whether we need to create more connds.
* It will try to create new thread if it's necessary, @timeout can
* be updated if failed to create, so caller wouldn't keep try while
* running out of resource.
*/
static void ksocknal_connd_check_start(time64_t sec, long *timeout)
{
int rc;
int total = ksocknal_data.ksnd_connd_starting +
ksocknal_data.ksnd_connd_running;
/* still in initializing */
if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL))
return;
/* can't create more connd, or still have enough
* threads to handle more connecting
*/
if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV)
return;
/* no pending connecting request */
if (list_empty(&ksocknal_data.ksnd_connd_routes))
return;
/* may run out of resource, retry later */
if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
*timeout = cfs_time_seconds(1);
return;
}
/* serialize starting to avoid flood */
if (ksocknal_data.ksnd_connd_starting > 0)
return;
ksocknal_data.ksnd_connd_starting_stamp = sec;
ksocknal_data.ksnd_connd_starting++;
spin_unlock_bh(&ksocknal_data.ksnd_connd_lock);
/* NB: total is the next id */
rc = ksocknal_thread_start(ksocknal_connd, NULL,
"socknal_cd%02d", total);
spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
if (rc == 0)
return;
/* we tried ... */
LASSERT(ksocknal_data.ksnd_connd_starting > 0);
ksocknal_data.ksnd_connd_starting--;
ksocknal_data.ksnd_connd_failed_stamp = ktime_get_real_seconds();
return;
}
/* check whether current thread can exit, it will return 1 if there are too
* many threads and no creating in past 120 seconds.
* Also, this function may update @timeout to make caller come back
* again to recheck these conditions.
*/
static int
ksocknal_connd_check_stop(time64_t sec, long *timeout)
{
int val;
if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
/* still in initializing */
return 0;
}
if (ksocknal_data.ksnd_connd_starting > 0) {
/* in progress of starting new thread */
return 0;
}
if (ksocknal_data.ksnd_connd_running <=
*ksocknal_tunables.ksnd_nconnds) { /* can't shrink */
return 0;
}
/* created thread in past 120 seconds? */
val = (int)(ksocknal_data.ksnd_connd_starting_stamp +
SOCKNAL_CONND_TIMEOUT - sec);
*timeout = (val > 0) ? cfs_time_seconds(val) :
cfs_time_seconds(SOCKNAL_CONND_TIMEOUT);
if (val > 0)
return 0;
/* no creating in past 120 seconds */
return ksocknal_data.ksnd_connd_running >
ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV;
}
/* Go through connd_cbs queue looking for a conn_cb that we can process
* right now, @timeout_p can be updated if we need to come back later
*/
static struct ksock_conn_cb *
ksocknal_connd_get_conn_cb_locked(signed long *timeout_p)
{
time64_t now = ktime_get_seconds();
time64_t conn_timeout;
struct ksock_conn_cb *conn_cb;
/* connd_routes can contain both pending and ordinary routes */
list_for_each_entry(conn_cb, &ksocknal_data.ksnd_connd_routes,
ksnr_connd_list) {
conn_timeout = conn_cb->ksnr_timeout;
if (conn_cb->ksnr_retry_interval == 0 ||
now >= conn_timeout)
return conn_cb;
if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
*timeout_p > cfs_time_seconds(conn_timeout - now))
*timeout_p = cfs_time_seconds(conn_timeout - now);
}
return NULL;
}
int
ksocknal_connd(void *arg)
{
spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
wait_queue_entry_t wait;
init_wait(&wait);
spin_lock_bh(connd_lock);
LASSERT(ksocknal_data.ksnd_connd_starting > 0);
ksocknal_data.ksnd_connd_starting--;
ksocknal_data.ksnd_connd_running++;
while (!ksocknal_data.ksnd_shuttingdown) {
struct ksock_conn_cb *conn_cb = NULL;
time64_t sec = ktime_get_real_seconds();
long timeout = MAX_SCHEDULE_TIMEOUT;
struct ksock_connreq *cr = NULL;
if (ksocknal_connd_check_stop(sec, &timeout)) {
/* wakeup another one to check stop */
wake_up(&ksocknal_data.ksnd_connd_waitq);
break;
}
/* Start new thread? */
ksocknal_connd_check_start(sec, &timeout);
cr = list_first_entry_or_null(&ksocknal_data.ksnd_connd_connreqs,
struct ksock_connreq, ksncr_list);
if (cr) {
/* Connection accepted by the listener */
list_del(&cr->ksncr_list);
spin_unlock_bh(connd_lock);
ksocknal_create_conn(cr->ksncr_ni, NULL,
cr->ksncr_sock, SOCKLND_CONN_NONE);
lnet_ni_decref(cr->ksncr_ni);
LIBCFS_FREE(cr, sizeof(*cr));
spin_lock_bh(connd_lock);
}
/* Only handle an outgoing connection request if there
* is a thread left to handle incoming connections and
* create new connd
*/
if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV <
ksocknal_data.ksnd_connd_running)
conn_cb = ksocknal_connd_get_conn_cb_locked(&timeout);
if (conn_cb) {
list_del(&conn_cb->ksnr_connd_list);
ksocknal_data.ksnd_connd_connecting++;
spin_unlock_bh(connd_lock);
ksocknal_connect(conn_cb);
ksocknal_conn_cb_decref(conn_cb);
spin_lock_bh(connd_lock);
ksocknal_data.ksnd_connd_connecting--;
}
/* Nothing to do for 'timeout' */
if (!cr && !conn_cb) {
spin_unlock_bh(connd_lock);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq,
&wait);
schedule_timeout(timeout);
remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
spin_lock_bh(connd_lock);
} else if (need_resched()) {
spin_unlock_bh(connd_lock);
cond_resched();
spin_lock_bh(connd_lock);
}
}
ksocknal_data.ksnd_connd_running--;
spin_unlock_bh(connd_lock);
ksocknal_thread_fini();
return 0;
}
static struct ksock_conn *
ksocknal_find_timed_out_conn(struct ksock_peer_ni *peer_ni)
{
/* We're called with a shared lock on ksnd_global_lock */
struct ksock_conn *conn;
struct ksock_tx *tx;
struct ksock_sched *sched;
list_for_each_entry(conn, &peer_ni->ksnp_conns, ksnc_list) {
int error;
/* Don't need the {get,put}connsock dance to deref ksnc_sock */
LASSERT(!conn->ksnc_closing);
sched = conn->ksnc_scheduler;
error = conn->ksnc_sock->sk->sk_err;
if (error != 0) {
ksocknal_conn_addref(conn);
switch (error) {
case ECONNRESET:
CNETERR("A connection with %s (%pIScp) was reset; it may have rebooted.\n",
libcfs_idstr(&peer_ni->ksnp_id),
&conn->ksnc_peeraddr);
break;
case ETIMEDOUT:
CNETERR("A connection with %s (%pIScp) timed out; the network or node may be down.\n",
libcfs_idstr(&peer_ni->ksnp_id),
&conn->ksnc_peeraddr);
break;
default:
CNETERR("An unexpected network error %d occurred with %s (%pIScp\n",
error,
libcfs_idstr(&peer_ni->ksnp_id),
&conn->ksnc_peeraddr);
break;
}
return conn;
}
if (conn->ksnc_rx_started &&
ktime_get_seconds() >= conn->ksnc_rx_deadline) {
/* Timed out incomplete incoming message */
ksocknal_conn_addref(conn);
CNETERR("Timeout receiving from %s (%pIScp), state %d wanted %zd left %d\n",
libcfs_idstr(&peer_ni->ksnp_id),
&conn->ksnc_peeraddr,
conn->ksnc_rx_state,
iov_iter_count(&conn->ksnc_rx_to),
conn->ksnc_rx_nob_left);
return conn;
}
spin_lock_bh(&sched->kss_lock);
if ((!list_empty(&conn->ksnc_tx_queue) ||
conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
ktime_get_seconds() >= conn->ksnc_tx_deadline) {
/* Timed out messages queued for sending or
* buffered in the socket's send buffer
*/
ksocknal_conn_addref(conn);
list_for_each_entry(tx, &conn->ksnc_tx_queue,
tx_list)
tx->tx_hstatus =
LNET_MSG_STATUS_NETWORK_TIMEOUT;
CNETERR("Timeout sending data to %s (%pIScp) the network or that node may be down.\n",
libcfs_idstr(&peer_ni->ksnp_id),
&conn->ksnc_peeraddr);
spin_unlock_bh(&sched->kss_lock);
return conn;
}
spin_unlock_bh(&sched->kss_lock);
}
return NULL;
}
static inline void
ksocknal_flush_stale_txs(struct ksock_peer_ni *peer_ni)
{
struct ksock_tx *tx;
LIST_HEAD(stale_txs);
write_lock_bh(&ksocknal_data.ksnd_global_lock);
while ((tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
struct ksock_tx,
tx_list)) != NULL) {
if (ktime_get_seconds() < tx->tx_deadline)
break;
tx->tx_hstatus = LNET_MSG_STATUS_NETWORK_TIMEOUT;
list_move_tail(&tx->tx_list, &stale_txs);
}
write_unlock_bh(&ksocknal_data.ksnd_global_lock);
ksocknal_txlist_done(peer_ni->ksnp_ni, &stale_txs, -ETIMEDOUT);
}
static int
ksocknal_send_keepalive_locked(struct ksock_peer_ni *peer_ni)
__must_hold(&ksocknal_data.ksnd_global_lock)
{
struct ksock_sched *sched;
struct ksock_conn *conn;
struct ksock_tx *tx;
/* last_alive will be updated by create_conn */
if (list_empty(&peer_ni->ksnp_conns))
return 0;
if (peer_ni->ksnp_proto != &ksocknal_protocol_v3x &&
peer_ni->ksnp_proto != &ksocknal_protocol_v4x)
return 0;
if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
ktime_get_seconds() < peer_ni->ksnp_last_alive +
*ksocknal_tunables.ksnd_keepalive)
return 0;
if (ktime_get_seconds() < peer_ni->ksnp_send_keepalive)
return 0;
/* retry 10 secs later, so we wouldn't put pressure
* on this peer_ni if we failed to send keepalive this time
*/
peer_ni->ksnp_send_keepalive = ktime_get_seconds() + 10;
conn = ksocknal_find_conn_locked(peer_ni, NULL, 1);
if (conn != NULL) {
sched = conn->ksnc_scheduler;
spin_lock_bh(&sched->kss_lock);
if (!list_empty(&conn->ksnc_tx_queue)) {
spin_unlock_bh(&sched->kss_lock);
/* there is an queued ACK, don't need keepalive */
return 0;
}
spin_unlock_bh(&sched->kss_lock);
}
read_unlock(&ksocknal_data.ksnd_global_lock);
/* cookie = 1 is reserved for keepalive PING */
tx = ksocknal_alloc_tx_noop(1, 1);
if (tx == NULL) {
read_lock(&ksocknal_data.ksnd_global_lock);
return -ENOMEM;
}
if (ksocknal_launch_packet(peer_ni->ksnp_ni, tx, &peer_ni->ksnp_id)
== 0) {
read_lock(&ksocknal_data.ksnd_global_lock);
return 1;
}
ksocknal_free_tx(tx);
read_lock(&ksocknal_data.ksnd_global_lock);
return -EIO;
}
static void
ksocknal_check_peer_timeouts(int idx)
{
struct hlist_head *peers = &ksocknal_data.ksnd_peers[idx];
struct ksock_peer_ni *peer_ni;
struct ksock_conn *conn;
struct ksock_tx *tx;
again:
/* NB. We expect to have a look at all the peers and not find any
* connections to time out, so we just use a shared lock while we
* take a look...
*/
read_lock(&ksocknal_data.ksnd_global_lock);
hlist_for_each_entry(peer_ni, peers, ksnp_list) {
struct ksock_tx *tx_stale;
time64_t deadline = 0;
int resid = 0;
int n = 0;
if (ksocknal_send_keepalive_locked(peer_ni) != 0) {
read_unlock(&ksocknal_data.ksnd_global_lock);
goto again;
}
conn = ksocknal_find_timed_out_conn(peer_ni);
if (conn != NULL) {
read_unlock(&ksocknal_data.ksnd_global_lock);
ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
/* NB we won't find this one again, but we can't
* just proceed with the next peer_ni, since we dropped
* ksnd_global_lock and it might be dead already!
*/
ksocknal_conn_decref(conn);
goto again;
}
/* we can't process stale txs right here because we're
* holding only shared lock
*/
tx = list_first_entry_or_null(&peer_ni->ksnp_tx_queue,
struct ksock_tx, tx_list);
if (tx && ktime_get_seconds() >= tx->tx_deadline) {
ksocknal_peer_addref(peer_ni);
read_unlock(&ksocknal_data.ksnd_global_lock);
ksocknal_flush_stale_txs(peer_ni);
ksocknal_peer_decref(peer_ni);
goto again;
}
if (list_empty(&peer_ni->ksnp_zc_req_list))
continue;
tx_stale = NULL;
spin_lock(&peer_ni->ksnp_lock);
list_for_each_entry(tx, &peer_ni->ksnp_zc_req_list, tx_zc_list) {
if (ktime_get_seconds() < tx->tx_deadline)
break;
/* ignore the TX if connection is being closed */
if (tx->tx_conn->ksnc_closing)
continue;
n++;
if (tx_stale == NULL)
tx_stale = tx;
}
if (tx_stale == NULL) {
spin_unlock(&peer_ni->ksnp_lock);
continue;
}
deadline = tx_stale->tx_deadline;
resid = tx_stale->tx_resid;
conn = tx_stale->tx_conn;
ksocknal_conn_addref(conn);
spin_unlock(&peer_ni->ksnp_lock);
read_unlock(&ksocknal_data.ksnd_global_lock);
CERROR("Total %d stale ZC_REQs for peer_ni %s detected; the oldest(%p) timed out %lld secs ago, resid: %d, wmem: %d\n",
n, libcfs_nidstr(&peer_ni->ksnp_id.nid), tx_stale,
ktime_get_seconds() - deadline,
resid, conn->ksnc_sock->sk->sk_wmem_queued);
ksocknal_close_conn_and_siblings(conn, -ETIMEDOUT);
ksocknal_conn_decref(conn);
goto again;
}
read_unlock(&ksocknal_data.ksnd_global_lock);
}
int ksocknal_reaper(void *arg)
{
wait_queue_entry_t wait;
struct ksock_conn *conn;
struct ksock_sched *sched;
LIST_HEAD(enomem_conns);
int nenomem_conns;
time64_t timeout;
int i;
int peer_index = 0;
time64_t deadline = ktime_get_seconds();
init_wait(&wait);
spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
while (!ksocknal_data.ksnd_shuttingdown) {
conn = list_first_entry_or_null(&ksocknal_data.ksnd_deathrow_conns,
struct ksock_conn, ksnc_list);
if (conn) {
list_del(&conn->ksnc_list);
spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
ksocknal_terminate_conn(conn);
ksocknal_conn_decref(conn);
spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
continue;
}
conn = list_first_entry_or_null(&ksocknal_data.ksnd_zombie_conns,
struct ksock_conn, ksnc_list);
if (conn) {
list_del(&conn->ksnc_list);
spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
ksocknal_destroy_conn(conn);
spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
continue;
}
list_splice_init(&ksocknal_data.ksnd_enomem_conns,
&enomem_conns);
spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
/* reschedule all the connections that stalled with ENOMEM... */
nenomem_conns = 0;
while ((conn = list_first_entry_or_null(&enomem_conns,
struct ksock_conn,
ksnc_tx_list)) != NULL) {
list_del(&conn->ksnc_tx_list);
sched = conn->ksnc_scheduler;
spin_lock_bh(&sched->kss_lock);
LASSERT(conn->ksnc_tx_scheduled);
conn->ksnc_tx_ready = 1;
list_add_tail(&conn->ksnc_tx_list,
&sched->kss_tx_conns);
wake_up(&sched->kss_waitq);
spin_unlock_bh(&sched->kss_lock);
nenomem_conns++;
}
/* careful with the jiffy wrap... */
while ((timeout = deadline - ktime_get_seconds()) <= 0) {
const int n = 4;
const int p = 1;
int chunk = HASH_SIZE(ksocknal_data.ksnd_peers);
unsigned int lnd_timeout;
/* Time to check for timeouts on a few more peers: I
* do checks every 'p' seconds on a proportion of the
* peer_ni table and I need to check every connection
* 'n' times within a timeout interval, to ensure I
* detect a timeout on any connection within (n+1)/n
* times the timeout interval.
*/
lnd_timeout = ksocknal_timeout();
if (lnd_timeout > n * p)
chunk = (chunk * n * p) / lnd_timeout;
if (chunk == 0)
chunk = 1;
for (i = 0; i < chunk; i++) {
ksocknal_check_peer_timeouts(peer_index);
peer_index = (peer_index + 1) %
HASH_SIZE(ksocknal_data.ksnd_peers);
}
deadline += p;
}
if (nenomem_conns != 0) {
/* Reduce my timeout if I rescheduled ENOMEM conns.
* This also prevents me getting woken immediately
* if any go back on my enomem list.
*/
timeout = SOCKNAL_ENOMEM_RETRY;
}
ksocknal_data.ksnd_reaper_waketime = ktime_get_seconds() +
timeout;
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
if (!ksocknal_data.ksnd_shuttingdown &&
list_empty(&ksocknal_data.ksnd_deathrow_conns) &&
list_empty(&ksocknal_data.ksnd_zombie_conns))
schedule_timeout(cfs_time_seconds(timeout));
set_current_state(TASK_RUNNING);
remove_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
}
spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
ksocknal_thread_fini();
return 0;
}
