--- /dev/null
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ *
+ * 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>
+ *
+ * This file is part of Portals, http://www.sf.net/projects/sandiaportals/
+ *
+ * Portals is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Portals is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Portals; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "socklnd.h"
+
+ksock_tx_t *
+ksocknal_alloc_tx(int type, int size)
+{
+ ksock_tx_t *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);
+
+ if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) {
+ tx = list_entry(ksocknal_data.ksnd_idle_noop_txs. \
+ next, ksock_tx_t, tx_list);
+ 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;
+
+ atomic_set(&tx->tx_refcount, 1);
+ tx->tx_zc_aborted = 0;
+ tx->tx_zc_capable = 0;
+ tx->tx_zc_checked = 0;
+ tx->tx_desc_size = size;
+
+ atomic_inc(&ksocknal_data.ksnd_nactive_txs);
+
+ return tx;
+}
+
+ksock_tx_t *
+ksocknal_alloc_tx_noop(__u64 cookie, int nonblk)
+{
+ ksock_tx_t *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_iov = tx->tx_frags.virt.iov;
+ tx->tx_niov = 1;
+ tx->tx_nonblk = nonblk;
+
+ socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_NOOP);
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
+
+ return tx;
+}
+
+
+void
+ksocknal_free_tx (ksock_tx_t *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_iov (ksock_conn_t *conn, ksock_tx_t *tx)
+{
+ struct kvec *iov = tx->tx_iov;
+ int nob;
+ int rc;
+
+ LASSERT (tx->tx_niov > 0);
+
+ /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */
+ rc = ksocknal_lib_send_iov(conn, tx);
+
+ if (rc <= 0) /* sent nothing? */
+ return rc;
+
+ nob = rc;
+ LASSERT (nob <= tx->tx_resid);
+ tx->tx_resid -= nob;
+
+ /* "consume" iov */
+ do {
+ LASSERT (tx->tx_niov > 0);
+
+ if (nob < (int) iov->iov_len) {
+ iov->iov_base = (void *)((char *)iov->iov_base + nob);
+ iov->iov_len -= nob;
+ return rc;
+ }
+
+ nob -= iov->iov_len;
+ tx->tx_iov = ++iov;
+ tx->tx_niov--;
+ } while (nob != 0);
+
+ return rc;
+}
+
+static int
+ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
+{
+ lnet_kiov_t *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->kiov_len) {
+ kiov->kiov_offset += nob;
+ kiov->kiov_len -= nob;
+ return rc;
+ }
+
+ nob -= (int)kiov->kiov_len;
+ tx->tx_kiov = ++kiov;
+ tx->tx_nkiov--;
+ } while (nob != 0);
+
+ return rc;
+}
+
+static int
+ksocknal_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
+{
+ int rc;
+ int bufnob;
+
+ if (ksocknal_data.ksnd_stall_tx != 0) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(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_iov (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 =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_tx_bufnob = bufnob;
+ mb();
+ }
+
+ if (rc <= 0) { /* Didn't write anything? */
+
+ if (rc == 0) /* some stacks return 0 instead of -EAGAIN */
+ 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_iov (ksock_conn_t *conn)
+{
+ struct kvec *iov = conn->ksnc_rx_iov;
+ int nob;
+ int rc;
+
+ LASSERT (conn->ksnc_rx_niov > 0);
+
+ /* Never touch conn->ksnc_rx_iov or change connection
+ * status inside ksocknal_lib_recv_iov */
+ rc = ksocknal_lib_recv_iov(conn);
+
+ if (rc <= 0)
+ return rc;
+
+ /* received something... */
+ nob = rc;
+
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_rx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ mb(); /* order with setting rx_started */
+ conn->ksnc_rx_started = 1;
+
+ conn->ksnc_rx_nob_wanted -= nob;
+ conn->ksnc_rx_nob_left -= nob;
+
+ do {
+ LASSERT (conn->ksnc_rx_niov > 0);
+
+ if (nob < (int)iov->iov_len) {
+ iov->iov_len -= nob;
+ iov->iov_base += nob;
+ return -EAGAIN;
+ }
+
+ nob -= iov->iov_len;
+ conn->ksnc_rx_iov = ++iov;
+ conn->ksnc_rx_niov--;
+ } while (nob != 0);
+
+ return rc;
+}
+
+static int
+ksocknal_recv_kiov (ksock_conn_t *conn)
+{
+ lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
+ int nob;
+ int rc;
+ LASSERT (conn->ksnc_rx_nkiov > 0);
+
+ /* Never touch conn->ksnc_rx_kiov or change connection
+ * status inside ksocknal_lib_recv_iov */
+ rc = ksocknal_lib_recv_kiov(conn);
+
+ if (rc <= 0)
+ return rc;
+
+ /* received something... */
+ nob = rc;
+
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_rx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ mb(); /* order with setting rx_started */
+ conn->ksnc_rx_started = 1;
+
+ conn->ksnc_rx_nob_wanted -= nob;
+ conn->ksnc_rx_nob_left -= nob;
+
+ do {
+ LASSERT (conn->ksnc_rx_nkiov > 0);
+
+ if (nob < (int) kiov->kiov_len) {
+ kiov->kiov_offset += nob;
+ kiov->kiov_len -= nob;
+ return -EAGAIN;
+ }
+
+ nob -= kiov->kiov_len;
+ conn->ksnc_rx_kiov = ++kiov;
+ conn->ksnc_rx_nkiov--;
+ } while (nob != 0);
+
+ return 1;
+}
+
+static int
+ksocknal_receive (ksock_conn_t *conn)
+{
+ /* Return 1 on success, 0 on EOF, < 0 on error.
+ * Caller checks ksnc_rx_nob_wanted to determine
+ * progress/completion. */
+ int rc;
+
+ if (ksocknal_data.ksnd_stall_rx != 0) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(ksocknal_data.ksnd_stall_rx));
+ }
+
+ rc = ksocknal_connsock_addref(conn);
+ if (rc != 0) {
+ LASSERT (conn->ksnc_closing);
+ return -ESHUTDOWN;
+ }
+
+ for (;;) {
+ if (conn->ksnc_rx_niov != 0)
+ rc = ksocknal_recv_iov (conn);
+ else
+ rc = ksocknal_recv_kiov (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 (conn->ksnc_rx_nob_wanted == 0) {
+ rc = 1;
+ break;
+ }
+ }
+
+ ksocknal_connsock_decref(conn);
+ return rc;
+}
+
+void
+ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx)
+{
+ lnet_msg_t *lnetmsg = tx->tx_lnetmsg;
+ int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO;
+
+ LASSERT(ni != NULL || tx->tx_conn != NULL);
+
+ if (tx->tx_conn != NULL)
+ ksocknal_conn_decref(tx->tx_conn);
+
+ if (ni == NULL && tx->tx_conn != NULL)
+ ni = tx->tx_conn->ksnc_peer->ksnp_ni;
+
+ ksocknal_free_tx (tx);
+ if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */
+ lnet_finalize (ni, lnetmsg, rc);
+}
+
+void
+ksocknal_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int error)
+{
+ ksock_tx_t *tx;
+
+ while (!list_empty (txlist)) {
+ tx = list_entry (txlist->next, ksock_tx_t, tx_list);
+
+ if (error && tx->tx_lnetmsg != NULL) {
+ CNETERR("Deleting packet type %d len %d %s->%s\n",
+ le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type),
+ le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length),
+ libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)),
+ libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid)));
+ } else if (error) {
+ CNETERR("Deleting noop packet\n");
+ }
+
+ list_del (&tx->tx_list);
+
+ LASSERT (atomic_read(&tx->tx_refcount) == 1);
+ ksocknal_tx_done (ni, tx);
+ }
+}
+
+static void
+ksocknal_check_zc_req(ksock_tx_t *tx)
+{
+ ksock_conn_t *conn = tx->tx_conn;
+ ksock_peer_t *peer = 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 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->ksnp_lock);
+
+ /* ZC_REQ is going to be pinned to the peer */
+ tx->tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+
+ LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
+
+ tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++;
+
+ if (peer->ksnp_zc_next_cookie == 0)
+ peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1;
+
+ list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list);
+
+ spin_unlock(&peer->ksnp_lock);
+}
+
+static void
+ksocknal_uncheck_zc_req(ksock_tx_t *tx)
+{
+ ksock_peer_t *peer = 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->ksnp_lock);
+
+ if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
+ /* Not waiting for an ACK */
+ spin_unlock(&peer->ksnp_lock);
+ return;
+ }
+
+ tx->tx_msg.ksm_zc_cookies[0] = 0;
+ list_del(&tx->tx_zc_list);
+
+ spin_unlock(&peer->ksnp_lock);
+
+ ksocknal_tx_decref(tx);
+}
+
+static int
+ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx)
+{
+ int rc;
+
+ 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 (%u allocated)\n",
+ counter, conn, atomic_read(&libcfs_kmemory));
+
+ /* 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 (!cfs_time_aftereq(cfs_time_add(cfs_time_current(),
+ SOCKNAL_ENOMEM_RETRY),
+ ksocknal_data.ksnd_reaper_waketime))
+ wake_up (&ksocknal_data.ksnd_reaper_waitq);
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+ return rc;
+ }
+
+ /* Actual error */
+ LASSERT (rc < 0);
+
+ if (!conn->ksnc_closing) {
+ switch (rc) {
+ case -ECONNRESET:
+ LCONSOLE_WARN("Host %pI4h reset our connection while we were sending data; it may have rebooted.\n",
+ &conn->ksnc_ipaddr);
+ break;
+ default:
+ LCONSOLE_WARN("There was an unexpected network error while writing to %pI4h: %d.\n",
+ &conn->ksnc_ipaddr, rc);
+ break;
+ }
+ CDEBUG(D_NET, "[%p] Error %d on write to %s ip %pI4h:%d\n",
+ conn, rc,
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ }
+
+ if (tx->tx_zc_checked)
+ ksocknal_uncheck_zc_req(tx);
+
+ /* it's not an error if conn is being closed */
+ ksocknal_close_conn_and_siblings (conn,
+ (conn->ksnc_closing) ? 0 : rc);
+
+ return rc;
+}
+
+static void
+ksocknal_launch_connection_locked (ksock_route_t *route)
+{
+
+ /* called holding write lock on ksnd_global_lock */
+
+ LASSERT (!route->ksnr_scheduled);
+ LASSERT (!route->ksnr_connecting);
+ LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0);
+
+ route->ksnr_scheduled = 1; /* scheduling conn for connd */
+ ksocknal_route_addref(route); /* extra ref for connd */
+
+ spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
+
+ list_add_tail(&route->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 (ksock_peer_t *peer)
+{
+ ksock_route_t *route;
+
+ /* called holding write lock on ksnd_global_lock */
+ for (;;) {
+ /* launch any/all connections that need it */
+ route = ksocknal_find_connectable_route_locked(peer);
+ if (route == NULL)
+ return;
+
+ ksocknal_launch_connection_locked(route);
+ }
+}
+
+ksock_conn_t *
+ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk)
+{
+ struct list_head *tmp;
+ ksock_conn_t *conn;
+ ksock_conn_t *typed = NULL;
+ ksock_conn_t *fallback = NULL;
+ int tnob = 0;
+ int fnob = 0;
+
+ list_for_each (tmp, &peer->ksnp_conns) {
+ ksock_conn_t *c = list_entry(tmp, ksock_conn_t, 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) {
+ default:
+ LBUG();
+ 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 &&
+ cfs_time_after(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 &&
+ cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) {
+ fallback = c;
+ fnob = nob;
+ }
+ break;
+ }
+ }
+
+ /* prefer the typed selection */
+ conn = (typed != NULL) ? typed : fallback;
+
+ if (conn != NULL)
+ conn->ksnc_tx_last_post = cfs_time_current();
+
+ return conn;
+}
+
+void
+ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *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 (ksock_tx_t *tx, ksock_conn_t *conn)
+{
+ ksock_sched_t *sched = conn->ksnc_scheduler;
+ ksock_msg_t *msg = &tx->tx_msg;
+ ksock_tx_t *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 %pI4h:%d\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+
+ 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_iov) +
+ 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 != NULL) ? tx->tx_lnetmsg->msg_hdr.type:
+ KSOCK_MSG_NOOP,
+ tx->tx_nob, tx->tx_niov, tx->tx_nkiov);
+
+ /*
+ * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__
+ * but they're used inside spinlocks a lot.
+ */
+ 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 =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+ if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */
+ conn->ksnc_peer->ksnp_last_alive = cfs_time_current();
+ conn->ksnc_tx_bufnob = 0;
+ 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);
+}
+
+
+ksock_route_t *
+ksocknal_find_connectable_route_locked (ksock_peer_t *peer)
+{
+ unsigned long now = cfs_time_current();
+ struct list_head *tmp;
+ ksock_route_t *route;
+
+ list_for_each (tmp, &peer->ksnp_routes) {
+ route = list_entry (tmp, ksock_route_t, ksnr_list);
+
+ LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
+
+ if (route->ksnr_scheduled) /* connections being established */
+ continue;
+
+ /* all route types connected ? */
+ if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0)
+ continue;
+
+ if (!(route->ksnr_retry_interval == 0 || /* first attempt */
+ cfs_time_aftereq(now, route->ksnr_timeout))) {
+ CDEBUG(D_NET,
+ "Too soon to retry route %pI4h (cnted %d, interval %ld, %ld secs later)\n",
+ &route->ksnr_ipaddr,
+ route->ksnr_connected,
+ route->ksnr_retry_interval,
+ cfs_duration_sec(route->ksnr_timeout - now));
+ continue;
+ }
+
+ return route;
+ }
+
+ return NULL;
+}
+
+ksock_route_t *
+ksocknal_find_connecting_route_locked (ksock_peer_t *peer)
+{
+ struct list_head *tmp;
+ ksock_route_t *route;
+
+ list_for_each (tmp, &peer->ksnp_routes) {
+ route = list_entry (tmp, ksock_route_t, ksnr_list);
+
+ LASSERT (!route->ksnr_connecting || route->ksnr_scheduled);
+
+ if (route->ksnr_scheduled)
+ return route;
+ }
+
+ return NULL;
+}
+
+int
+ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
+{
+ ksock_peer_t *peer;
+ ksock_conn_t *conn;
+ rwlock_t *g_lock;
+ int retry;
+ int rc;
+
+ LASSERT (tx->tx_conn == NULL);
+
+ g_lock = &ksocknal_data.ksnd_global_lock;
+
+ for (retry = 0;; retry = 1) {
+ read_lock(g_lock);
+ peer = ksocknal_find_peer_locked(ni, id);
+ if (peer != NULL) {
+ if (ksocknal_find_connectable_route_locked(peer) == NULL) {
+ conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk);
+ if (conn != NULL) {
+ /* I've got no routes 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 = ksocknal_find_peer_locked(ni, id);
+ if (peer != 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_id2str(id));
+ return -EHOSTUNREACH;
+ }
+
+ if (retry) {
+ CERROR("Can't find peer %s\n", libcfs_id2str(id));
+ return -EHOSTUNREACH;
+ }
+
+ rc = ksocknal_add_peer(ni, id,
+ LNET_NIDADDR(id.nid),
+ lnet_acceptor_port());
+ if (rc != 0) {
+ CERROR("Can't add peer %s: %d\n",
+ libcfs_id2str(id), rc);
+ return rc;
+ }
+ }
+
+ ksocknal_launch_all_connections_locked(peer);
+
+ conn = ksocknal_find_conn_locked(peer, 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->ksnp_accepting > 0 ||
+ ksocknal_find_connecting_route_locked (peer) != NULL) {
+ /* the message is going to be pinned to the peer */
+ tx->tx_deadline =
+ cfs_time_shift(*ksocknal_tunables.ksnd_timeout);
+
+ /* Queue the message until a connection is established */
+ list_add_tail (&tx->tx_list, &peer->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_id2str(id));
+ return -EHOSTUNREACH;
+}
+
+int
+ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
+{
+ int mpflag = 1;
+ int type = lntmsg->msg_type;
+ lnet_process_id_t target = lntmsg->msg_target;
+ unsigned int payload_niov = lntmsg->msg_niov;
+ struct kvec *payload_iov = lntmsg->msg_iov;
+ lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
+ unsigned int payload_offset = lntmsg->msg_offset;
+ unsigned int payload_nob = lntmsg->msg_len;
+ ksock_tx_t *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_id2str(target));
+
+ LASSERT (payload_nob == 0 || payload_niov > 0);
+ LASSERT (payload_niov <= LNET_MAX_IOV);
+ /* payload is either all vaddrs or all pages */
+ LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
+ LASSERT (!in_interrupt ());
+
+ if (payload_iov != NULL)
+ desc_size = offsetof(ksock_tx_t,
+ tx_frags.virt.iov[1 + payload_niov]);
+ else
+ desc_size = offsetof(ksock_tx_t,
+ tx_frags.paged.kiov[payload_niov]);
+
+ if (lntmsg->msg_vmflush)
+ mpflag = cfs_memory_pressure_get_and_set();
+ 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)
+ cfs_memory_pressure_restore(mpflag);
+ return -ENOMEM;
+ }
+
+ tx->tx_conn = NULL; /* set when assigned a conn */
+ tx->tx_lnetmsg = lntmsg;
+
+ if (payload_iov != NULL) {
+ tx->tx_kiov = NULL;
+ tx->tx_nkiov = 0;
+ tx->tx_iov = tx->tx_frags.virt.iov;
+ tx->tx_niov = 1 +
+ lnet_extract_iov(payload_niov, &tx->tx_iov[1],
+ payload_niov, payload_iov,
+ payload_offset, payload_nob);
+ } else {
+ tx->tx_niov = 1;
+ tx->tx_iov = &tx->tx_frags.paged.iov;
+ tx->tx_kiov = tx->tx_frags.paged.kiov;
+ tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov,
+ payload_niov, payload_kiov,
+ payload_offset, payload_nob);
+
+ if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload)
+ tx->tx_zc_capable = 1;
+ }
+
+ socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET);
+
+ /* The first fragment will be set later in pro_pack */
+ rc = ksocknal_launch_packet(ni, tx, target);
+ if (!mpflag)
+ cfs_memory_pressure_restore(mpflag);
+
+ if (rc == 0)
+ return 0;
+
+ ksocknal_free_tx(tx);
+ return -EIO;
+}
+
+int
+ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name)
+{
+ struct task_struct *task = kthread_run(fn, arg, "%s", name);
+
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+ ksocknal_data.ksnd_nthreads++;
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+ return 0;
+}
+
+void
+ksocknal_thread_fini (void)
+{
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+ ksocknal_data.ksnd_nthreads--;
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+}
+
+int
+ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip)
+{
+ static char ksocknal_slop_buffer[4096];
+
+ 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;
+ mb(); /* racing with timeout thread */
+
+ switch (conn->ksnc_proto->pro_version) {
+ case KSOCK_PROTO_V2:
+ case KSOCK_PROTO_V3:
+ conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER;
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = &conn->ksnc_msg;
+
+ conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u);
+ conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u);
+ conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u);
+ break;
+
+ case KSOCK_PROTO_V1:
+ /* Receiving bare lnet_hdr_t */
+ conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
+ conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t);
+ conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t);
+
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = &conn->ksnc_msg.ksm_u.lnetmsg;
+ conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t);
+ break;
+
+ default:
+ LBUG ();
+ }
+ conn->ksnc_rx_niov = 1;
+
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_nkiov = 0;
+ 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;
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ skipped = 0;
+ niov = 0;
+
+ do {
+ nob = min_t(int, nob_to_skip, sizeof(ksocknal_slop_buffer));
+
+ conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer;
+ conn->ksnc_rx_iov[niov].iov_len = nob;
+ niov++;
+ skipped += nob;
+ nob_to_skip -=nob;
+
+ } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */
+ niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec));
+
+ conn->ksnc_rx_niov = niov;
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_nkiov = 0;
+ conn->ksnc_rx_nob_wanted = skipped;
+ return 0;
+}
+
+static int
+ksocknal_process_receive (ksock_conn_t *conn)
+{
+ lnet_hdr_t *lhdr;
+ lnet_process_id_t *id;
+ int rc;
+
+ LASSERT (atomic_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 (conn->ksnc_rx_nob_wanted != 0) {
+ rc = ksocknal_receive(conn);
+
+ if (rc <= 0) {
+ LASSERT (rc != -EAGAIN);
+
+ if (rc == 0)
+ CDEBUG(D_NET, "[%p] EOF from %s ip %pI4h:%d\n",
+ conn,
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ else if (!conn->ksnc_closing)
+ CERROR("[%p] Error %d on read from %s ip %pI4h:%d\n",
+ conn, rc,
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+
+ /* 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 (conn->ksnc_rx_nob_wanted != 0) {
+ /* 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_type != KSOCK_MSG_LNET) {
+ CERROR("%s: Unknown message type: %x\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id),
+ conn->ksnc_msg.ksm_type);
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings(conn, -EPROTO);
+ return -EPROTO;
+ }
+
+ 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_id2str(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_id2str(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;
+ }
+ }
+
+ if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) {
+ ksocknal_new_packet (conn, 0);
+ return 0; /* NOOP is done and just return */
+ }
+
+ conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER;
+ conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t);
+ conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t);
+
+ conn->ksnc_rx_iov = (struct kvec *)&conn->ksnc_rx_iov_space;
+ conn->ksnc_rx_iov[0].iov_base = &conn->ksnc_msg.ksm_u.lnetmsg;
+ conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t);
+
+ conn->ksnc_rx_niov = 1;
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_nkiov = 0;
+
+ goto again; /* read lnet header now */
+
+ case SOCKNAL_RX_LNET_HEADER:
+ /* unpack message header */
+ conn->ksnc_proto->pro_unpack(&conn->ksnc_msg);
+
+ if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) {
+ /* Userspace peer */
+ lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
+ id = &conn->ksnc_peer->ksnp_id;
+
+ /* Substitute process ID assigned at connection time */
+ lhdr->src_pid = cpu_to_le32(id->pid);
+ lhdr->src_nid = cpu_to_le64(id->nid);
+ }
+
+ conn->ksnc_rx_state = SOCKNAL_RX_PARSE;
+ ksocknal_conn_addref(conn); /* ++ref while parsing */
+
+ rc = lnet_parse(conn->ksnc_peer->ksnp_ni,
+ &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_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_id2str(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);
+
+ lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr;
+ 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 ||
+ le64_to_cpu(lhdr->src_nid) != id->nid);
+ }
+
+ lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc);
+
+ if (rc != 0) {
+ ksocknal_new_packet(conn, 0);
+ ksocknal_close_conn_and_siblings (conn, rc);
+ return -EPROTO;
+ }
+ /* Fall through */
+
+ 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 (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
+ unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
+ unsigned int offset, unsigned int mlen, unsigned int rlen)
+{
+ ksock_conn_t *conn = (ksock_conn_t *)private;
+ ksock_sched_t *sched = conn->ksnc_scheduler;
+
+ LASSERT (mlen <= rlen);
+ LASSERT (niov <= LNET_MAX_IOV);
+
+ conn->ksnc_cookie = msg;
+ conn->ksnc_rx_nob_wanted = mlen;
+ conn->ksnc_rx_nob_left = rlen;
+
+ if (mlen == 0 || iov != NULL) {
+ conn->ksnc_rx_nkiov = 0;
+ conn->ksnc_rx_kiov = NULL;
+ conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov;
+ conn->ksnc_rx_niov =
+ lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov,
+ niov, iov, offset, mlen);
+ } else {
+ conn->ksnc_rx_niov = 0;
+ conn->ksnc_rx_iov = NULL;
+ conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov;
+ conn->ksnc_rx_nkiov =
+ lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov,
+ niov, kiov, offset, mlen);
+ }
+
+ LASSERT (mlen ==
+ lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) +
+ lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov));
+
+ 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(ksock_sched_t *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_info *info;
+ ksock_sched_t *sched;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+ int rc;
+ int nloops = 0;
+ long id = (long)arg;
+
+ info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)];
+ sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)];
+
+ cfs_block_allsigs();
+
+ rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt);
+ if (rc != 0) {
+ CERROR("Can't set CPT affinity to %d: %d\n",
+ info->ksi_cpt, rc);
+ }
+
+ spin_lock_bh(&sched->kss_lock);
+
+ while (!ksocknal_data.ksnd_shuttingdown) {
+ int did_something = 0;
+
+ /* Ensure I progress everything semi-fairly */
+
+ if (!list_empty (&sched->kss_rx_conns)) {
+ conn = list_entry(sched->kss_rx_conns.next,
+ ksock_conn_t, ksnc_rx_list);
+ 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 = 1;
+ }
+
+ if (!list_empty (&sched->kss_tx_conns)) {
+ LIST_HEAD (zlist);
+
+ if (!list_empty(&sched->kss_zombie_noop_txs)) {
+ list_add(&zlist,
+ &sched->kss_zombie_noop_txs);
+ list_del_init(&sched->kss_zombie_noop_txs);
+ }
+
+ conn = list_entry(sched->kss_tx_conns.next,
+ ksock_conn_t, 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_entry(conn->ksnc_tx_queue.next,
+ ksock_tx_t, 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 = 1;
+ }
+ if (!did_something || /* nothing to do */
+ ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */
+ spin_unlock_bh(&sched->kss_lock);
+
+ nloops = 0;
+
+ 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 (ksock_conn_t *conn)
+{
+ ksock_sched_t *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 (ksock_conn_t *conn)
+{
+ ksock_sched_t *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 ksock_proto_t *
+ksocknal_parse_proto_version (ksock_hello_msg_t *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 != 0) {
+#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;
+
+ return NULL;
+ }
+
+ if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) {
+ lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello;
+
+ CLASSERT (sizeof (lnet_magicversion_t) ==
+ offsetof (ksock_hello_msg_t, kshm_src_nid));
+
+ 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 (lnet_ni_t *ni, ksock_conn_t *conn,
+ lnet_nid_t peer_nid, ksock_hello_msg_t *hello)
+{
+ /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */
+ ksock_net_t *net = (ksock_net_t *)ni->ni_data;
+
+ LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES);
+
+ /* 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 (lnet_ni_t *ni, ksock_conn_t *conn,
+ ksock_hello_msg_t *hello, lnet_process_id_t *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;
+ ksock_proto_t *proto;
+ lnet_process_id_t recv_id;
+
+ /* socket type set on active connections - not set on passive */
+ LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE));
+
+ timeout = active ? *ksocknal_tunables.ksnd_timeout :
+ lnet_acceptor_timeout();
+
+ rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading HELLO from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT (rc < 0);
+ return rc;
+ }
+
+ 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 %pI4h\n",
+ __cpu_to_le32 (hello->kshm_magic),
+ LNET_PROTO_TCP_MAGIC,
+ &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
+
+ rc = libcfs_sock_read(sock, &hello->kshm_version,
+ sizeof(hello->kshm_version), timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading HELLO from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT (rc < 0);
+ return rc;
+ }
+
+ proto = ksocknal_parse_proto_version(hello);
+ if (proto == NULL) {
+ if (!active) {
+ /* unknown protocol from peer, tell peer my protocol */
+ 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
+ hello->kshm_nips = 0;
+ ksocknal_send_hello(ni, conn, ni->ni_nid, hello);
+ }
+
+ CERROR("Unknown protocol version (%d.x expected) from %pI4h\n",
+ conn->ksnc_proto->pro_version,
+ &conn->ksnc_ipaddr);
+
+ return -EPROTO;
+ }
+
+ 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 from %pI4h\n",
+ rc, &conn->ksnc_ipaddr);
+ LASSERT (rc < 0);
+ return rc;
+ }
+
+ *incarnation = hello->kshm_src_incarnation;
+
+ if (hello->kshm_src_nid == LNET_NID_ANY) {
+ CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY from %pI4h\n",
+ &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
+
+ if (!active &&
+ conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
+ /* Userspace NAL assigns peer process ID from socket */
+ recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG;
+ recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr);
+ } else {
+ recv_id.nid = hello->kshm_src_nid;
+ recv_id.pid = hello->kshm_src_pid;
+ }
+
+ if (!active) {
+ *peerid = recv_id;
+
+ /* peer 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 %pI4h\n",
+ hello->kshm_ctype, libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr);
+ return -EPROTO;
+ }
+
+ return 0;
+ }
+
+ if (peerid->pid != recv_id.pid ||
+ peerid->nid != recv_id.nid) {
+ LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host %pI4h, but they claimed they were %s; please check your Lustre configuration.\n",
+ libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr,
+ libcfs_id2str(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 %pI4h %d\n",
+ conn->ksnc_type, libcfs_id2str(*peerid),
+ &conn->ksnc_ipaddr,
+ hello->kshm_ctype);
+ return -EPROTO;
+ }
+
+ return 0;
+}
+
+static int
+ksocknal_connect (ksock_route_t *route)
+{
+ LIST_HEAD (zombies);
+ ksock_peer_t *peer = route->ksnr_peer;
+ int type;
+ int wanted;
+ struct socket *sock;
+ unsigned long deadline;
+ int retry_later = 0;
+ int rc = 0;
+
+ deadline = cfs_time_add(cfs_time_current(),
+ cfs_time_seconds(*ksocknal_tunables.ksnd_timeout));
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+
+ LASSERT (route->ksnr_scheduled);
+ LASSERT (!route->ksnr_connecting);
+
+ route->ksnr_connecting = 1;
+
+ for (;;) {
+ wanted = ksocknal_route_mask() & ~route->ksnr_connected;
+
+ /* stop connecting if peer/route got closed under me, or
+ * route got connected while queued */
+ if (peer->ksnp_closing || route->ksnr_deleted ||
+ wanted == 0) {
+ retry_later = 0;
+ break;
+ }
+
+ /* reschedule if peer is connecting to me */
+ if (peer->ksnp_accepting > 0) {
+ CDEBUG(D_NET,
+ "peer %s(%d) already connecting to me, retry later.\n",
+ libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting);
+ retry_later = 1;
+ }
+
+ if (retry_later) /* needs reschedule */
+ break;
+
+ if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) {
+ type = SOCKLND_CONN_ANY;
+ } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) {
+ type = SOCKLND_CONN_CONTROL;
+ } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) {
+ type = SOCKLND_CONN_BULK_IN;
+ } else {
+ LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0);
+ type = SOCKLND_CONN_BULK_OUT;
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ if (cfs_time_aftereq(cfs_time_current(), deadline)) {
+ rc = -ETIMEDOUT;
+ lnet_connect_console_error(rc, peer->ksnp_id.nid,
+ route->ksnr_ipaddr,
+ route->ksnr_port);
+ goto failed;
+ }
+
+ rc = lnet_connect(&sock, peer->ksnp_id.nid,
+ route->ksnr_myipaddr,
+ route->ksnr_ipaddr, route->ksnr_port);
+ if (rc != 0)
+ goto failed;
+
+ rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type);
+ if (rc < 0) {
+ lnet_connect_console_error(rc, peer->ksnp_id.nid,
+ route->ksnr_ipaddr,
+ route->ksnr_port);
+ goto failed;
+ }
+
+ /* A +ve RC means I have to retry because I lost the connection
+ * race or I have to renegotiate protocol version */
+ retry_later = (rc != 0);
+ if (retry_later)
+ CDEBUG(D_NET, "peer %s: conn race, retry later.\n",
+ libcfs_nid2str(peer->ksnp_id.nid));
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+ }
+
+ route->ksnr_scheduled = 0;
+ route->ksnr_connecting = 0;
+
+ if (retry_later) {
+ /* re-queue for attention; this frees me up to handle
+ * the peer's incoming connection request */
+
+ if (rc == EALREADY ||
+ (rc == 0 && peer->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 */
+ route->ksnr_retry_interval =
+ cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000;
+ route->ksnr_timeout = cfs_time_add(cfs_time_current(),
+ route->ksnr_retry_interval);
+ }
+
+ ksocknal_launch_connection_locked(route);
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+ return retry_later;
+
+ failed:
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+
+ route->ksnr_scheduled = 0;
+ route->ksnr_connecting = 0;
+
+ /* This is a retry rather than a new connection */
+ route->ksnr_retry_interval *= 2;
+ route->ksnr_retry_interval =
+ max(route->ksnr_retry_interval,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000);
+ route->ksnr_retry_interval =
+ min(route->ksnr_retry_interval,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000);
+
+ LASSERT (route->ksnr_retry_interval != 0);
+ route->ksnr_timeout = cfs_time_add(cfs_time_current(),
+ route->ksnr_retry_interval);
+
+ if (!list_empty(&peer->ksnp_tx_queue) &&
+ peer->ksnp_accepting == 0 &&
+ ksocknal_find_connecting_route_locked(peer) == NULL) {
+ ksock_conn_t *conn;
+
+ /* ksnp_tx_queue is queued on a conn on successful
+ * connection for V1.x and V2.x */
+ if (!list_empty (&peer->ksnp_conns)) {
+ conn = list_entry(peer->ksnp_conns.next,
+ ksock_conn_t, ksnc_list);
+ LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x);
+ }
+
+ /* take all the blocked packets while I've got the lock and
+ * complete below... */
+ list_splice_init(&peer->ksnp_tx_queue, &zombies);
+ }
+
+#if 0 /* irrelevant with only eager routes */
+ if (!route->ksnr_deleted) {
+ /* make this route least-favourite for re-selection */
+ list_del(&route->ksnr_list);
+ list_add_tail(&route->ksnr_list, &peer->ksnp_routes);
+ }
+#endif
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_peer_failed(peer);
+ ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1);
+ 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 int
+ksocknal_connd_check_start(long sec, long *timeout)
+{
+ char name[16];
+ int rc;
+ int total = ksocknal_data.ksnd_connd_starting +
+ ksocknal_data.ksnd_connd_running;
+
+ if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) {
+ /* still in initializing */
+ return 0;
+ }
+
+ if (total >= *ksocknal_tunables.ksnd_nconnds_max ||
+ total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) {
+ /* can't create more connd, or still have enough
+ * threads to handle more connecting */
+ return 0;
+ }
+
+ if (list_empty(&ksocknal_data.ksnd_connd_routes)) {
+ /* no pending connecting request */
+ return 0;
+ }
+
+ if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) {
+ /* may run out of resource, retry later */
+ *timeout = cfs_time_seconds(1);
+ return 0;
+ }
+
+ if (ksocknal_data.ksnd_connd_starting > 0) {
+ /* serialize starting to avoid flood */
+ return 0;
+ }
+
+ 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 */
+ snprintf(name, sizeof(name), "socknal_cd%02d", total);
+ rc = ksocknal_thread_start(ksocknal_connd, NULL, name);
+
+ spin_lock_bh(&ksocknal_data.ksnd_connd_lock);
+ if (rc == 0)
+ return 1;
+
+ /* we tried ... */
+ LASSERT(ksocknal_data.ksnd_connd_starting > 0);
+ ksocknal_data.ksnd_connd_starting--;
+ ksocknal_data.ksnd_connd_failed_stamp = get_seconds();
+
+ return 1;
+}
+
+/*
+ * 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(long 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_routes queue looking for a route that we can process
+ * right now, @timeout_p can be updated if we need to come back later */
+static ksock_route_t *
+ksocknal_connd_get_route_locked(signed long *timeout_p)
+{
+ ksock_route_t *route;
+ unsigned long now;
+
+ now = cfs_time_current();
+
+ /* connd_routes can contain both pending and ordinary routes */
+ list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes,
+ ksnr_connd_list) {
+
+ if (route->ksnr_retry_interval == 0 ||
+ cfs_time_aftereq(now, route->ksnr_timeout))
+ return route;
+
+ if (*timeout_p == MAX_SCHEDULE_TIMEOUT ||
+ (int)*timeout_p > (int)(route->ksnr_timeout - now))
+ *timeout_p = (int)(route->ksnr_timeout - now);
+ }
+
+ return NULL;
+}
+
+int
+ksocknal_connd (void *arg)
+{
+ spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock;
+ ksock_connreq_t *cr;
+ wait_queue_t wait;
+ int nloops = 0;
+ int cons_retry = 0;
+
+ cfs_block_allsigs ();
+
+ init_waitqueue_entry(&wait, current);
+
+ 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) {
+ ksock_route_t *route = NULL;
+ long sec = get_seconds();
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+ int dropped_lock = 0;
+
+ if (ksocknal_connd_check_stop(sec, &timeout)) {
+ /* wakeup another one to check stop */
+ wake_up(&ksocknal_data.ksnd_connd_waitq);
+ break;
+ }
+
+ if (ksocknal_connd_check_start(sec, &timeout)) {
+ /* created new thread */
+ dropped_lock = 1;
+ }
+
+ if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) {
+ /* Connection accepted by the listener */
+ cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \
+ next, ksock_connreq_t, ksncr_list);
+
+ list_del(&cr->ksncr_list);
+ spin_unlock_bh(connd_lock);
+ dropped_lock = 1;
+
+ 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) {
+ route = ksocknal_connd_get_route_locked(&timeout);
+ }
+ if (route != NULL) {
+ list_del (&route->ksnr_connd_list);
+ ksocknal_data.ksnd_connd_connecting++;
+ spin_unlock_bh(connd_lock);
+ dropped_lock = 1;
+
+ if (ksocknal_connect(route)) {
+ /* consecutive retry */
+ if (cons_retry++ > SOCKNAL_INSANITY_RECONN) {
+ CWARN("massive consecutive re-connecting to %pI4h\n",
+ &route->ksnr_ipaddr);
+ cons_retry = 0;
+ }
+ } else {
+ cons_retry = 0;
+ }
+
+ ksocknal_route_decref(route);
+
+ spin_lock_bh(connd_lock);
+ ksocknal_data.ksnd_connd_connecting--;
+ }
+
+ if (dropped_lock) {
+ if (++nloops < SOCKNAL_RESCHED)
+ continue;
+ spin_unlock_bh(connd_lock);
+ nloops = 0;
+ cond_resched();
+ spin_lock_bh(connd_lock);
+ continue;
+ }
+
+ /* Nothing to do for 'timeout' */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait);
+ spin_unlock_bh(connd_lock);
+
+ nloops = 0;
+ schedule_timeout(timeout);
+
+ remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
+ spin_lock_bh(connd_lock);
+ }
+ ksocknal_data.ksnd_connd_running--;
+ spin_unlock_bh(connd_lock);
+
+ ksocknal_thread_fini();
+ return 0;
+}
+
+static ksock_conn_t *
+ksocknal_find_timed_out_conn (ksock_peer_t *peer)
+{
+ /* We're called with a shared lock on ksnd_global_lock */
+ ksock_conn_t *conn;
+ struct list_head *ctmp;
+
+ list_for_each (ctmp, &peer->ksnp_conns) {
+ int error;
+ conn = list_entry (ctmp, ksock_conn_t, ksnc_list);
+
+ /* Don't need the {get,put}connsock dance to deref ksnc_sock */
+ LASSERT (!conn->ksnc_closing);
+
+ /* SOCK_ERROR will reset error code of socket in
+ * some platform (like Darwin8.x) */
+ error = conn->ksnc_sock->sk->sk_err;
+ if (error != 0) {
+ ksocknal_conn_addref(conn);
+
+ switch (error) {
+ case ECONNRESET:
+ CNETERR("A connection with %s (%pI4h:%d) was reset; it may have rebooted.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ case ETIMEDOUT:
+ CNETERR("A connection with %s (%pI4h:%d) timed out; the network or node may be down.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ default:
+ CNETERR("An unexpected network error %d occurred with %s (%pI4h:%d\n",
+ error,
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ break;
+ }
+
+ return conn;
+ }
+
+ if (conn->ksnc_rx_started &&
+ cfs_time_aftereq(cfs_time_current(),
+ conn->ksnc_rx_deadline)) {
+ /* Timed out incomplete incoming message */
+ ksocknal_conn_addref(conn);
+ CNETERR("Timeout receiving from %s (%pI4h:%d), state %d wanted %d left %d\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port,
+ conn->ksnc_rx_state,
+ conn->ksnc_rx_nob_wanted,
+ conn->ksnc_rx_nob_left);
+ return conn;
+ }
+
+ if ((!list_empty(&conn->ksnc_tx_queue) ||
+ conn->ksnc_sock->sk->sk_wmem_queued != 0) &&
+ cfs_time_aftereq(cfs_time_current(),
+ conn->ksnc_tx_deadline)) {
+ /* Timed out messages queued for sending or
+ * buffered in the socket's send buffer */
+ ksocknal_conn_addref(conn);
+ CNETERR("Timeout sending data to %s (%pI4h:%d) the network or that node may be down.\n",
+ libcfs_id2str(peer->ksnp_id),
+ &conn->ksnc_ipaddr,
+ conn->ksnc_port);
+ return conn;
+ }
+ }
+
+ return NULL;
+}
+
+static inline void
+ksocknal_flush_stale_txs(ksock_peer_t *peer)
+{
+ ksock_tx_t *tx;
+ LIST_HEAD (stale_txs);
+
+ write_lock_bh(&ksocknal_data.ksnd_global_lock);
+
+ while (!list_empty (&peer->ksnp_tx_queue)) {
+ tx = list_entry (peer->ksnp_tx_queue.next,
+ ksock_tx_t, tx_list);
+
+ if (!cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline))
+ break;
+
+ list_del (&tx->tx_list);
+ list_add_tail (&tx->tx_list, &stale_txs);
+ }
+
+ write_unlock_bh(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1);
+}
+
+static int
+ksocknal_send_keepalive_locked(ksock_peer_t *peer)
+{
+ ksock_sched_t *sched;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+
+ if (list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */
+ return 0;
+
+ if (peer->ksnp_proto != &ksocknal_protocol_v3x)
+ return 0;
+
+ if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
+ time_before(cfs_time_current(),
+ cfs_time_add(peer->ksnp_last_alive,
+ cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive))))
+ return 0;
+
+ if (time_before(cfs_time_current(), peer->ksnp_send_keepalive))
+ return 0;
+
+ /* retry 10 secs later, so we wouldn't put pressure
+ * on this peer if we failed to send keepalive this time */
+ peer->ksnp_send_keepalive = cfs_time_shift(10);
+
+ conn = ksocknal_find_conn_locked(peer, 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->ksnp_ni, tx, peer->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 list_head *peers = &ksocknal_data.ksnd_peers[idx];
+ ksock_peer_t *peer;
+ ksock_conn_t *conn;
+ ksock_tx_t *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);
+
+ list_for_each_entry(peer, peers, ksnp_list) {
+ unsigned long deadline = 0;
+ int resid = 0;
+ int n = 0;
+
+ if (ksocknal_send_keepalive_locked(peer) != 0) {
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+ goto again;
+ }
+
+ conn = ksocknal_find_timed_out_conn (peer);
+
+ 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, 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 */
+ if (!list_empty (&peer->ksnp_tx_queue)) {
+ ksock_tx_t *tx =
+ list_entry (peer->ksnp_tx_queue.next,
+ ksock_tx_t, tx_list);
+
+ if (cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline)) {
+
+ ksocknal_peer_addref(peer);
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ ksocknal_flush_stale_txs(peer);
+
+ ksocknal_peer_decref(peer);
+ goto again;
+ }
+ }
+
+ if (list_empty(&peer->ksnp_zc_req_list))
+ continue;
+
+ spin_lock(&peer->ksnp_lock);
+ list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) {
+ if (!cfs_time_aftereq(cfs_time_current(),
+ tx->tx_deadline))
+ break;
+ /* ignore the TX if connection is being closed */
+ if (tx->tx_conn->ksnc_closing)
+ continue;
+ n++;
+ }
+
+ if (n == 0) {
+ spin_unlock(&peer->ksnp_lock);
+ continue;
+ }
+
+ tx = list_entry(peer->ksnp_zc_req_list.next,
+ ksock_tx_t, tx_zc_list);
+ deadline = tx->tx_deadline;
+ resid = tx->tx_resid;
+ conn = tx->tx_conn;
+ ksocknal_conn_addref(conn);
+
+ spin_unlock(&peer->ksnp_lock);
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ CERROR("Total %d stale ZC_REQs for peer %s detected; the oldest(%p) timed out %ld secs ago, resid: %d, wmem: %d\n",
+ n, libcfs_nid2str(peer->ksnp_id.nid), tx,
+ cfs_duration_sec(cfs_time_current() - 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_t wait;
+ ksock_conn_t *conn;
+ ksock_sched_t *sched;
+ struct list_head enomem_conns;
+ int nenomem_conns;
+ long timeout;
+ int i;
+ int peer_index = 0;
+ unsigned long deadline = cfs_time_current();
+
+ cfs_block_allsigs ();
+
+ INIT_LIST_HEAD(&enomem_conns);
+ init_waitqueue_entry(&wait, current);
+
+ spin_lock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ while (!ksocknal_data.ksnd_shuttingdown) {
+
+ if (!list_empty (&ksocknal_data.ksnd_deathrow_conns)) {
+ conn = list_entry (ksocknal_data. \
+ ksnd_deathrow_conns.next,
+ ksock_conn_t, ksnc_list);
+ 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;
+ }
+
+ if (!list_empty (&ksocknal_data.ksnd_zombie_conns)) {
+ conn = list_entry (ksocknal_data.ksnd_zombie_conns.\
+ next, ksock_conn_t, ksnc_list);
+ 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;
+ }
+
+ if (!list_empty (&ksocknal_data.ksnd_enomem_conns)) {
+ list_add(&enomem_conns,
+ &ksocknal_data.ksnd_enomem_conns);
+ list_del_init(&ksocknal_data.ksnd_enomem_conns);
+ }
+
+ spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock);
+
+ /* reschedule all the connections that stalled with ENOMEM... */
+ nenomem_conns = 0;
+ while (!list_empty (&enomem_conns)) {
+ conn = list_entry (enomem_conns.next,
+ ksock_conn_t, ksnc_tx_list);
+ 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 = cfs_time_sub(deadline,
+ cfs_time_current())) <= 0) {
+ const int n = 4;
+ const int p = 1;
+ int chunk = ksocknal_data.ksnd_peer_hash_size;
+
+ /* Time to check for timeouts on a few more peers: I do
+ * checks every 'p' seconds on a proportion of the peer
+ * 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. */
+
+ if (*ksocknal_tunables.ksnd_timeout > n * p)
+ chunk = (chunk * n * p) /
+ *ksocknal_tunables.ksnd_timeout;
+ if (chunk == 0)
+ chunk = 1;
+
+ for (i = 0; i < chunk; i++) {
+ ksocknal_check_peer_timeouts (peer_index);
+ peer_index = (peer_index + 1) %
+ ksocknal_data.ksnd_peer_hash_size;
+ }
+
+ deadline = cfs_time_add(deadline, cfs_time_seconds(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 =
+ cfs_time_add(cfs_time_current(), 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(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;
+}
Code Review / kvmfornfv.git / blobdiff