-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * lib/lib-msg.c
- * Message decoding, parsing and finalizing routines
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
*
- * This file is part of Lustre, http://www.lustre.org
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
*
- * Lustre 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.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
- * Lustre 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.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Copyright (c) 2012, 2017, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lnet/lnet/lib-msg.c
+ *
+ * Message decoding, parsing and finalizing routines
*/
#define DEBUG_SUBSYSTEM S_LNET
#include <lnet/lib-lnet.h>
void
-lnet_enq_event_locked (lnet_eq_t *eq, lnet_event_t *ev)
-{
- lnet_event_t *eq_slot;
-
- /* Allocate the next queue slot */
- ev->sequence = eq->eq_enq_seq++;
-
- /* size must be a power of 2 to handle sequence # overflow */
- LASSERT (eq->eq_size != 0 &&
- eq->eq_size == LOWEST_BIT_SET (eq->eq_size));
- eq_slot = eq->eq_events + (ev->sequence & (eq->eq_size - 1));
-
- /* There is no race since both event consumers and event producers
- * take the LNET_LOCK, so we don't screw around with memory
- * barriers, setting the sequence number last or wierd structure
- * layout assertions. */
- *eq_slot = *ev;
-
- /* Call the callback handler (if any) */
- if (eq->eq_callback != NULL)
- eq->eq_callback (eq_slot);
-
-#ifdef __KERNEL__
- /* Wake anyone waiting in LNetEQPoll() */
- if (cfs_waitq_active(&the_lnet.ln_waitq))
- cfs_waitq_broadcast(&the_lnet.ln_waitq);
-#else
-# ifndef HAVE_LIBPTHREAD
- /* LNetEQPoll() calls into _the_ LND to wait for action */
-# else
- /* Wake anyone waiting in LNetEQPoll() */
- pthread_cond_broadcast(&the_lnet.ln_cond);
-# endif
-#endif
+lnet_build_unlink_event(struct lnet_libmd *md, struct lnet_event *ev)
+{
+ ENTRY;
+
+ memset(ev, 0, sizeof(*ev));
+
+ ev->status = 0;
+ ev->unlinked = 1;
+ ev->type = LNET_EVENT_UNLINK;
+ lnet_md_deconstruct(md, &ev->md);
+ lnet_md2handle(&ev->md_handle, md);
+ EXIT;
}
+/*
+ * Don't need any lock, must be called after lnet_commit_md
+ */
void
-lnet_complete_msg_locked(lnet_msg_t *msg)
+lnet_build_msg_event(struct lnet_msg *msg, enum lnet_event_kind ev_type)
{
- lnet_handle_wire_t ack_wmd;
- int rc;
- int status = msg->msg_ev.status;
+ struct lnet_hdr *hdr = &msg->msg_hdr;
+ struct lnet_event *ev = &msg->msg_ev;
+
+ LASSERT(!msg->msg_routing);
+
+ ev->type = ev_type;
+ ev->msg_type = msg->msg_type;
+
+ if (ev_type == LNET_EVENT_SEND) {
+ /* event for active message */
+ ev->target.nid = le64_to_cpu(hdr->dest_nid);
+ ev->target.pid = le32_to_cpu(hdr->dest_pid);
+ ev->initiator.nid = LNET_NID_ANY;
+ ev->initiator.pid = the_lnet.ln_pid;
+ ev->source.nid = LNET_NID_ANY;
+ ev->source.pid = the_lnet.ln_pid;
+ ev->sender = LNET_NID_ANY;
+ } else {
+ /* event for passive message */
+ ev->target.pid = hdr->dest_pid;
+ ev->target.nid = hdr->dest_nid;
+ ev->initiator.pid = hdr->src_pid;
+ /* Multi-Rail: resolve src_nid to "primary" peer NID */
+ ev->initiator.nid = msg->msg_initiator;
+ /* Multi-Rail: track source NID. */
+ ev->source.pid = hdr->src_pid;
+ ev->source.nid = hdr->src_nid;
+ ev->rlength = hdr->payload_length;
+ ev->sender = msg->msg_from;
+ ev->mlength = msg->msg_wanted;
+ ev->offset = msg->msg_offset;
+ }
- LASSERT (msg->msg_onactivelist);
+ switch (ev_type) {
+ default:
+ LBUG();
- if (status == 0 && msg->msg_ack) {
- /* Only send an ACK if the PUT completed successfully */
+ case LNET_EVENT_PUT: /* passive PUT */
+ ev->pt_index = hdr->msg.put.ptl_index;
+ ev->match_bits = hdr->msg.put.match_bits;
+ ev->hdr_data = hdr->msg.put.hdr_data;
+ return;
- lnet_return_credits_locked(msg);
+ case LNET_EVENT_GET: /* passive GET */
+ ev->pt_index = hdr->msg.get.ptl_index;
+ ev->match_bits = hdr->msg.get.match_bits;
+ ev->hdr_data = 0;
+ return;
- msg->msg_ack = 0;
- LNET_UNLOCK();
-
- LASSERT(msg->msg_ev.type == LNET_EVENT_PUT);
- LASSERT(!msg->msg_routing);
+ case LNET_EVENT_ACK: /* ACK */
+ ev->match_bits = hdr->msg.ack.match_bits;
+ ev->mlength = hdr->msg.ack.mlength;
+ return;
- ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
-
- lnet_prep_send(msg, LNET_MSG_ACK, msg->msg_ev.initiator, 0, 0);
+ case LNET_EVENT_REPLY: /* REPLY */
+ return;
- msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
- msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;
- msg->msg_hdr.msg.ack.mlength = cpu_to_le32(msg->msg_ev.mlength);
-
- rc = lnet_send(msg->msg_ev.target.nid, msg);
+ case LNET_EVENT_SEND: /* active message */
+ if (msg->msg_type == LNET_MSG_PUT) {
+ ev->pt_index = le32_to_cpu(hdr->msg.put.ptl_index);
+ ev->match_bits = le64_to_cpu(hdr->msg.put.match_bits);
+ ev->offset = le32_to_cpu(hdr->msg.put.offset);
+ ev->mlength =
+ ev->rlength = le32_to_cpu(hdr->payload_length);
+ ev->hdr_data = le64_to_cpu(hdr->msg.put.hdr_data);
- LNET_LOCK();
+ } else {
+ LASSERT(msg->msg_type == LNET_MSG_GET);
+ ev->pt_index = le32_to_cpu(hdr->msg.get.ptl_index);
+ ev->match_bits = le64_to_cpu(hdr->msg.get.match_bits);
+ ev->mlength =
+ ev->rlength = le32_to_cpu(hdr->msg.get.sink_length);
+ ev->offset = le32_to_cpu(hdr->msg.get.src_offset);
+ ev->hdr_data = 0;
+ }
+ return;
+ }
+}
+
+void
+lnet_msg_commit(struct lnet_msg *msg, int cpt)
+{
+ struct lnet_msg_container *container = the_lnet.ln_msg_containers[cpt];
+ struct lnet_counters *counters = the_lnet.ln_counters[cpt];
+ s64 timeout_ns;
- if (rc == 0)
- return;
- } else if (status == 0 && /* OK so far */
- (msg->msg_routing && !msg->msg_sending)) { /* not forwarded */
-
- LASSERT (!msg->msg_receiving); /* called back recv already */
-
- LNET_UNLOCK();
-
- rc = lnet_send(LNET_NID_ANY, msg);
+ /* set the message deadline */
+ timeout_ns = lnet_transaction_timeout * NSEC_PER_SEC;
+ msg->msg_deadline = ktime_add_ns(ktime_get(), timeout_ns);
- LNET_LOCK();
+ /* routed message can be committed for both receiving and sending */
+ LASSERT(!msg->msg_tx_committed);
- if (rc == 0)
- return;
- }
+ if (msg->msg_sending) {
+ LASSERT(!msg->msg_receiving);
+ msg->msg_tx_cpt = cpt;
+ msg->msg_tx_committed = 1;
+ if (msg->msg_rx_committed) { /* routed message REPLY */
+ LASSERT(msg->msg_onactivelist);
+ return;
+ }
+ } else {
+ LASSERT(!msg->msg_sending);
+ msg->msg_rx_cpt = cpt;
+ msg->msg_rx_committed = 1;
+ }
- lnet_return_credits_locked(msg);
+ LASSERT(!msg->msg_onactivelist);
- LASSERT (msg->msg_onactivelist);
- msg->msg_onactivelist = 0;
- list_del (&msg->msg_activelist);
- the_lnet.ln_counters.msgs_alloc--;
- lnet_msg_free(msg);
+ msg->msg_onactivelist = 1;
+ list_add_tail(&msg->msg_activelist, &container->msc_active);
+
+ counters->msgs_alloc++;
+ if (counters->msgs_alloc > counters->msgs_max)
+ counters->msgs_max = counters->msgs_alloc;
}
+static void
+lnet_msg_decommit_tx(struct lnet_msg *msg, int status)
+{
+ struct lnet_counters *counters;
+ struct lnet_event *ev = &msg->msg_ev;
-void
-lnet_finalize (lnet_ni_t *ni, lnet_msg_t *msg, int status)
-{
-#ifdef __KERNEL__
- int i;
- int my_slot;
-#endif
- lnet_libmd_t *md;
-
- LASSERT (!in_interrupt ());
-
- if (msg == NULL)
- return;
-#if 0
- CDEBUG(D_WARNING, "%s msg->%s Flags:%s%s%s%s%s%s%s%s%s%s%s txp %s rxp %s\n",
- lnet_msgtyp2str(msg->msg_type), libcfs_id2str(msg->msg_target),
- msg->msg_target_is_router ? "t" : "",
- msg->msg_routing ? "X" : "",
- msg->msg_ack ? "A" : "",
- msg->msg_sending ? "S" : "",
- msg->msg_receiving ? "R" : "",
- msg->msg_delayed ? "d" : "",
- msg->msg_txcredit ? "C" : "",
- msg->msg_peertxcredit ? "c" : "",
- msg->msg_rtrcredit ? "F" : "",
- msg->msg_peerrtrcredit ? "f" : "",
- msg->msg_onactivelist ? "!" : "",
- msg->msg_txpeer == NULL ? "<none>" : libcfs_nid2str(msg->msg_txpeer->lp_nid),
- msg->msg_rxpeer == NULL ? "<none>" : libcfs_nid2str(msg->msg_rxpeer->lp_nid));
-#endif
- LNET_LOCK();
-
- LASSERT (msg->msg_onactivelist);
-
- msg->msg_ev.status = status;
-
- md = msg->msg_md;
- if (md != NULL) {
- int unlink;
-
- /* Now it's safe to drop my caller's ref */
- md->md_refcount--;
- LASSERT (md->md_refcount >= 0);
-
- unlink = lnet_md_unlinkable(md);
-
- msg->msg_ev.unlinked = unlink;
-
- if (md->md_eq != NULL)
- lnet_enq_event_locked(md->md_eq, &msg->msg_ev);
-
- if (unlink)
- lnet_md_unlink(md);
-
- msg->msg_md = NULL;
- }
-
- list_add_tail (&msg->msg_list, &the_lnet.ln_finalizeq);
-
- /* Recursion breaker. Don't complete the message here if I am (or
- * enough other threads are) already completing messages */
-
-#ifdef __KERNEL__
- my_slot = -1;
- for (i = 0; i < the_lnet.ln_nfinalizers; i++) {
- if (the_lnet.ln_finalizers[i] == cfs_current())
- goto out;
- if (my_slot < 0 && the_lnet.ln_finalizers[i] == NULL)
- my_slot = i;
- }
- if (my_slot < 0)
- goto out;
-
- the_lnet.ln_finalizers[my_slot] = cfs_current();
-#else
- if (the_lnet.ln_finalizing)
- goto out;
-
- the_lnet.ln_finalizing = 1;
-#endif
-
- while (!list_empty(&the_lnet.ln_finalizeq)) {
- msg = list_entry(the_lnet.ln_finalizeq.next,
- lnet_msg_t, msg_list);
-
- list_del(&msg->msg_list);
-
- /* NB drops and regains the lnet lock if it actually does
- * anything, so my finalizing friends can chomp along too */
- lnet_complete_msg_locked(msg);
- }
-
-#ifdef __KERNEL__
- the_lnet.ln_finalizers[my_slot] = NULL;
-#else
- the_lnet.ln_finalizing = 0;
-#endif
+ LASSERT(msg->msg_tx_committed);
+ if (status != 0)
+ goto out;
+
+ counters = the_lnet.ln_counters[msg->msg_tx_cpt];
+ switch (ev->type) {
+ default: /* routed message */
+ LASSERT(msg->msg_routing);
+ LASSERT(msg->msg_rx_committed);
+ LASSERT(ev->type == 0);
+
+ counters->route_length += msg->msg_len;
+ counters->route_count++;
+ goto incr_stats;
+
+ case LNET_EVENT_PUT:
+ /* should have been decommitted */
+ LASSERT(!msg->msg_rx_committed);
+ /* overwritten while sending ACK */
+ LASSERT(msg->msg_type == LNET_MSG_ACK);
+ msg->msg_type = LNET_MSG_PUT; /* fix type */
+ break;
+
+ case LNET_EVENT_SEND:
+ LASSERT(!msg->msg_rx_committed);
+ if (msg->msg_type == LNET_MSG_PUT)
+ counters->send_length += msg->msg_len;
+ break;
+
+ case LNET_EVENT_GET:
+ LASSERT(msg->msg_rx_committed);
+ /* overwritten while sending reply, we should never be
+ * here for optimized GET */
+ LASSERT(msg->msg_type == LNET_MSG_REPLY);
+ msg->msg_type = LNET_MSG_GET; /* fix type */
+ break;
+ }
+
+ counters->send_count++;
+incr_stats:
+ if (msg->msg_txpeer)
+ lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_SEND);
+ if (msg->msg_txni)
+ lnet_incr_stats(&msg->msg_txni->ni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_SEND);
out:
- LNET_UNLOCK();
+ lnet_return_tx_credits_locked(msg);
+ msg->msg_tx_committed = 0;
}
+static void
+lnet_msg_decommit_rx(struct lnet_msg *msg, int status)
+{
+ struct lnet_counters *counters;
+ struct lnet_event *ev = &msg->msg_ev;
+
+ LASSERT(!msg->msg_tx_committed); /* decommitted or never committed */
+ LASSERT(msg->msg_rx_committed);
+
+ if (status != 0)
+ goto out;
+
+ counters = the_lnet.ln_counters[msg->msg_rx_cpt];
+ switch (ev->type) {
+ default:
+ LASSERT(ev->type == 0);
+ LASSERT(msg->msg_routing);
+ goto incr_stats;
+
+ case LNET_EVENT_ACK:
+ LASSERT(msg->msg_type == LNET_MSG_ACK);
+ break;
+
+ case LNET_EVENT_GET:
+ /* type is "REPLY" if it's an optimized GET on passive side,
+ * because optimized GET will never be committed for sending,
+ * so message type wouldn't be changed back to "GET" by
+ * lnet_msg_decommit_tx(), see details in lnet_parse_get() */
+ LASSERT(msg->msg_type == LNET_MSG_REPLY ||
+ msg->msg_type == LNET_MSG_GET);
+ counters->send_length += msg->msg_wanted;
+ break;
+
+ case LNET_EVENT_PUT:
+ LASSERT(msg->msg_type == LNET_MSG_PUT);
+ break;
+
+ case LNET_EVENT_REPLY:
+ /* type is "GET" if it's an optimized GET on active side,
+ * see details in lnet_create_reply_msg() */
+ LASSERT(msg->msg_type == LNET_MSG_GET ||
+ msg->msg_type == LNET_MSG_REPLY);
+ break;
+ }
+
+ counters->recv_count++;
+
+incr_stats:
+ if (msg->msg_rxpeer)
+ lnet_incr_stats(&msg->msg_rxpeer->lpni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_RECV);
+ if (msg->msg_rxni)
+ lnet_incr_stats(&msg->msg_rxni->ni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_RECV);
+ if (ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_REPLY)
+ counters->recv_length += msg->msg_wanted;
+
+ out:
+ lnet_return_rx_credits_locked(msg);
+ msg->msg_rx_committed = 0;
+}
+
+void
+lnet_msg_decommit(struct lnet_msg *msg, int cpt, int status)
+{
+ int cpt2 = cpt;
+
+ LASSERT(msg->msg_tx_committed || msg->msg_rx_committed);
+ LASSERT(msg->msg_onactivelist);
+
+ if (msg->msg_tx_committed) { /* always decommit for sending first */
+ LASSERT(cpt == msg->msg_tx_cpt);
+ lnet_msg_decommit_tx(msg, status);
+ }
+
+ if (msg->msg_rx_committed) {
+ /* forwarding msg committed for both receiving and sending */
+ if (cpt != msg->msg_rx_cpt) {
+ lnet_net_unlock(cpt);
+ cpt2 = msg->msg_rx_cpt;
+ lnet_net_lock(cpt2);
+ }
+ lnet_msg_decommit_rx(msg, status);
+ }
+
+ list_del(&msg->msg_activelist);
+ msg->msg_onactivelist = 0;
+
+ the_lnet.ln_counters[cpt2]->msgs_alloc--;
+
+ if (cpt2 != cpt) {
+ lnet_net_unlock(cpt2);
+ lnet_net_lock(cpt);
+ }
+}
+
+void
+lnet_msg_attach_md(struct lnet_msg *msg, struct lnet_libmd *md,
+ unsigned int offset, unsigned int mlen)
+{
+ /* NB: @offset and @len are only useful for receiving */
+ /* Here, we attach the MD on lnet_msg and mark it busy and
+ * decrementing its threshold. Come what may, the lnet_msg "owns"
+ * the MD until a call to lnet_msg_detach_md or lnet_finalize()
+ * signals completion. */
+ LASSERT(!msg->msg_routing);
+
+ msg->msg_md = md;
+ if (msg->msg_receiving) { /* committed for receiving */
+ msg->msg_offset = offset;
+ msg->msg_wanted = mlen;
+ }
+
+ md->md_refcount++;
+ if (md->md_threshold != LNET_MD_THRESH_INF) {
+ LASSERT(md->md_threshold > 0);
+ md->md_threshold--;
+ }
+
+ /* build umd in event */
+ lnet_md2handle(&msg->msg_ev.md_handle, md);
+ lnet_md_deconstruct(md, &msg->msg_ev.md);
+}
+
+void
+lnet_msg_detach_md(struct lnet_msg *msg, int status)
+{
+ struct lnet_libmd *md = msg->msg_md;
+ int unlink;
+
+ /* Now it's safe to drop my caller's ref */
+ md->md_refcount--;
+ LASSERT(md->md_refcount >= 0);
+
+ unlink = lnet_md_unlinkable(md);
+ if (md->md_eq != NULL) {
+ msg->msg_ev.status = status;
+ msg->msg_ev.unlinked = unlink;
+ lnet_eq_enqueue_event(md->md_eq, &msg->msg_ev);
+ }
+
+ if (unlink)
+ lnet_md_unlink(md);
+
+ msg->msg_md = NULL;
+}
+
+static int
+lnet_complete_msg_locked(struct lnet_msg *msg, int cpt)
+{
+ struct lnet_handle_wire ack_wmd;
+ int rc;
+ int status = msg->msg_ev.status;
+
+ LASSERT(msg->msg_onactivelist);
+
+ if (status == 0 && msg->msg_ack) {
+ /* Only send an ACK if the PUT completed successfully */
+
+ lnet_msg_decommit(msg, cpt, 0);
+
+ msg->msg_ack = 0;
+ lnet_net_unlock(cpt);
+
+ LASSERT(msg->msg_ev.type == LNET_EVENT_PUT);
+ LASSERT(!msg->msg_routing);
+
+ ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
+
+ lnet_prep_send(msg, LNET_MSG_ACK, msg->msg_ev.source, 0, 0);
+
+ msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
+ msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;
+ msg->msg_hdr.msg.ack.mlength = cpu_to_le32(msg->msg_ev.mlength);
+
+ /* NB: we probably want to use NID of msg::msg_from as 3rd
+ * parameter (router NID) if it's routed message */
+ rc = lnet_send(msg->msg_ev.target.nid, msg, LNET_NID_ANY);
+
+ lnet_net_lock(cpt);
+ /*
+ * NB: message is committed for sending, we should return
+ * on success because LND will finalize this message later.
+ *
+ * Also, there is possibility that message is committed for
+ * sending and also failed before delivering to LND,
+ * i.e: ENOMEM, in that case we can't fall through either
+ * because CPT for sending can be different with CPT for
+ * receiving, so we should return back to lnet_finalize()
+ * to make sure we are locking the correct partition.
+ */
+ return rc;
+
+ } else if (status == 0 && /* OK so far */
+ (msg->msg_routing && !msg->msg_sending)) {
+ /* not forwarded */
+ LASSERT(!msg->msg_receiving); /* called back recv already */
+ lnet_net_unlock(cpt);
+
+ rc = lnet_send(LNET_NID_ANY, msg, LNET_NID_ANY);
+
+ lnet_net_lock(cpt);
+ /*
+ * NB: message is committed for sending, we should return
+ * on success because LND will finalize this message later.
+ *
+ * Also, there is possibility that message is committed for
+ * sending and also failed before delivering to LND,
+ * i.e: ENOMEM, in that case we can't fall through either:
+ * - The rule is message must decommit for sending first if
+ * the it's committed for both sending and receiving
+ * - CPT for sending can be different with CPT for receiving,
+ * so we should return back to lnet_finalize() to make
+ * sure we are locking the correct partition.
+ */
+ return rc;
+ }
+
+ lnet_msg_decommit(msg, cpt, status);
+ lnet_msg_free(msg);
+ return 0;
+}
+
+static void
+lnet_dec_healthv_locked(atomic_t *healthv)
+{
+ int h = atomic_read(healthv);
+
+ if (h < lnet_health_sensitivity) {
+ atomic_set(healthv, 0);
+ } else {
+ h -= lnet_health_sensitivity;
+ atomic_set(healthv, h);
+ }
+}
+
+static void
+lnet_handle_local_failure(struct lnet_msg *msg)
+{
+ struct lnet_ni *local_ni;
+
+ local_ni = msg->msg_txni;
+
+ /*
+ * the lnet_net_lock(0) is used to protect the addref on the ni
+ * and the recovery queue.
+ */
+ lnet_net_lock(0);
+ /* the mt could've shutdown and cleaned up the queues */
+ if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING) {
+ lnet_net_unlock(0);
+ return;
+ }
+
+ lnet_dec_healthv_locked(&local_ni->ni_healthv);
+ /*
+ * add the NI to the recovery queue if it's not already there
+ * and it's health value is actually below the maximum. It's
+ * possible that the sensitivity might be set to 0, and the health
+ * value will not be reduced. In this case, there is no reason to
+ * invoke recovery
+ */
+ if (list_empty(&local_ni->ni_recovery) &&
+ atomic_read(&local_ni->ni_healthv) < LNET_MAX_HEALTH_VALUE) {
+ CERROR("ni %s added to recovery queue. Health = %d\n",
+ libcfs_nid2str(local_ni->ni_nid),
+ atomic_read(&local_ni->ni_healthv));
+ list_add_tail(&local_ni->ni_recovery,
+ &the_lnet.ln_mt_localNIRecovq);
+ lnet_ni_addref_locked(local_ni, 0);
+ }
+ lnet_net_unlock(0);
+}
+
+static void
+lnet_handle_remote_failure(struct lnet_msg *msg)
+{
+ struct lnet_peer_ni *lpni;
+
+ lpni = msg->msg_txpeer;
+
+ /* lpni could be NULL if we're in the LOLND case */
+ if (!lpni)
+ return;
+
+ lnet_net_lock(0);
+ lnet_dec_healthv_locked(&lpni->lpni_healthv);
+ /*
+ * add the peer NI to the recovery queue if it's not already there
+ * and it's health value is actually below the maximum. It's
+ * possible that the sensitivity might be set to 0, and the health
+ * value will not be reduced. In this case, there is no reason to
+ * invoke recovery
+ */
+ lnet_peer_ni_add_to_recoveryq_locked(lpni);
+ lnet_net_unlock(0);
+}
+
+static void
+lnet_incr_hstats(struct lnet_msg *msg, enum lnet_msg_hstatus hstatus)
+{
+ struct lnet_ni *ni = msg->msg_txni;
+ struct lnet_peer_ni *lpni = msg->msg_txpeer;
+ struct lnet_counters *counters = the_lnet.ln_counters[0];
+
+ switch (hstatus) {
+ case LNET_MSG_STATUS_LOCAL_INTERRUPT:
+ atomic_inc(&ni->ni_hstats.hlt_local_interrupt);
+ counters->local_interrupt_count++;
+ break;
+ case LNET_MSG_STATUS_LOCAL_DROPPED:
+ atomic_inc(&ni->ni_hstats.hlt_local_dropped);
+ counters->local_dropped_count++;
+ break;
+ case LNET_MSG_STATUS_LOCAL_ABORTED:
+ atomic_inc(&ni->ni_hstats.hlt_local_aborted);
+ counters->local_aborted_count++;
+ break;
+ case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
+ atomic_inc(&ni->ni_hstats.hlt_local_no_route);
+ counters->local_no_route_count++;
+ break;
+ case LNET_MSG_STATUS_LOCAL_TIMEOUT:
+ atomic_inc(&ni->ni_hstats.hlt_local_timeout);
+ counters->local_timeout_count++;
+ break;
+ case LNET_MSG_STATUS_LOCAL_ERROR:
+ atomic_inc(&ni->ni_hstats.hlt_local_error);
+ counters->local_error_count++;
+ break;
+ case LNET_MSG_STATUS_REMOTE_DROPPED:
+ if (lpni)
+ atomic_inc(&lpni->lpni_hstats.hlt_remote_dropped);
+ counters->remote_dropped_count++;
+ break;
+ case LNET_MSG_STATUS_REMOTE_ERROR:
+ if (lpni)
+ atomic_inc(&lpni->lpni_hstats.hlt_remote_error);
+ counters->remote_error_count++;
+ break;
+ case LNET_MSG_STATUS_REMOTE_TIMEOUT:
+ if (lpni)
+ atomic_inc(&lpni->lpni_hstats.hlt_remote_timeout);
+ counters->remote_timeout_count++;
+ break;
+ case LNET_MSG_STATUS_NETWORK_TIMEOUT:
+ if (lpni)
+ atomic_inc(&lpni->lpni_hstats.hlt_network_timeout);
+ counters->network_timeout_count++;
+ break;
+ case LNET_MSG_STATUS_OK:
+ break;
+ default:
+ LBUG();
+ }
+}
+
+/*
+ * Do a health check on the message:
+ * return -1 if we're not going to handle the error or
+ * if we've reached the maximum number of retries.
+ * success case will return -1 as well
+ * return 0 if it the message is requeued for send
+ */
+static int
+lnet_health_check(struct lnet_msg *msg)
+{
+ enum lnet_msg_hstatus hstatus = msg->msg_health_status;
+ bool lo = false;
+
+ /* if we're shutting down no point in handling health. */
+ if (the_lnet.ln_state != LNET_STATE_RUNNING)
+ return -1;
+
+ LASSERT(msg->msg_txni);
+
+ /*
+ * if we're sending to the LOLND then the msg_txpeer will not be
+ * set. So no need to sanity check it.
+ */
+ if (LNET_NETTYP(LNET_NIDNET(msg->msg_txni->ni_nid)) != LOLND)
+ LASSERT(msg->msg_txpeer);
+ else
+ lo = true;
+
+ if (hstatus != LNET_MSG_STATUS_OK &&
+ ktime_compare(ktime_get(), msg->msg_deadline) >= 0)
+ return -1;
+
+ /*
+ * stats are only incremented for errors so avoid wasting time
+ * incrementing statistics if there is no error.
+ */
+ if (hstatus != LNET_MSG_STATUS_OK) {
+ lnet_net_lock(0);
+ lnet_incr_hstats(msg, hstatus);
+ lnet_net_unlock(0);
+ }
+
+ CDEBUG(D_NET, "health check: %s->%s: %s: %s\n",
+ libcfs_nid2str(msg->msg_txni->ni_nid),
+ (lo) ? "self" : libcfs_nid2str(msg->msg_txpeer->lpni_nid),
+ lnet_msgtyp2str(msg->msg_type),
+ lnet_health_error2str(hstatus));
+
+ switch (hstatus) {
+ case LNET_MSG_STATUS_OK:
+ lnet_inc_healthv(&msg->msg_txni->ni_healthv);
+ /*
+ * It's possible msg_txpeer is NULL in the LOLND
+ * case.
+ */
+ if (msg->msg_txpeer)
+ lnet_inc_healthv(&msg->msg_txpeer->lpni_healthv);
+
+ /* we can finalize this message */
+ return -1;
+ case LNET_MSG_STATUS_LOCAL_INTERRUPT:
+ case LNET_MSG_STATUS_LOCAL_DROPPED:
+ case LNET_MSG_STATUS_LOCAL_ABORTED:
+ case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
+ case LNET_MSG_STATUS_LOCAL_TIMEOUT:
+ lnet_handle_local_failure(msg);
+ /* add to the re-send queue */
+ goto resend;
+
+ /*
+ * These errors will not trigger a resend so simply
+ * finalize the message
+ */
+ case LNET_MSG_STATUS_LOCAL_ERROR:
+ lnet_handle_local_failure(msg);
+ return -1;
+
+ /*
+ * TODO: since the remote dropped the message we can
+ * attempt a resend safely.
+ */
+ case LNET_MSG_STATUS_REMOTE_DROPPED:
+ lnet_handle_remote_failure(msg);
+ goto resend;
+
+ case LNET_MSG_STATUS_REMOTE_ERROR:
+ case LNET_MSG_STATUS_REMOTE_TIMEOUT:
+ case LNET_MSG_STATUS_NETWORK_TIMEOUT:
+ lnet_handle_remote_failure(msg);
+ return -1;
+ default:
+ LBUG();
+ }
+
+resend:
+ /* don't resend recovery messages */
+ if (msg->msg_recovery)
+ return -1;
+
+ /*
+ * if we explicitly indicated we don't want to resend then just
+ * return
+ */
+ if (msg->msg_no_resend)
+ return -1;
+
+ /* check if the message has exceeded the number of retries */
+ if (msg->msg_retry_count >= lnet_retry_count)
+ return -1;
+ msg->msg_retry_count++;
+
+ lnet_net_lock(msg->msg_tx_cpt);
+
+ /*
+ * remove message from the active list and reset it in preparation
+ * for a resend. Two exception to this
+ *
+ * 1. the router case, whe a message is committed for rx when
+ * received, then tx when it is sent. When committed to both tx and
+ * rx we don't want to remove it from the active list.
+ *
+ * 2. The REPLY case since it uses the same msg block for the GET
+ * that was received.
+ */
+ if (!msg->msg_routing && msg->msg_type != LNET_MSG_REPLY) {
+ list_del_init(&msg->msg_activelist);
+ msg->msg_onactivelist = 0;
+ }
+ /*
+ * The msg_target.nid which was originally set
+ * when calling LNetGet() or LNetPut() might've
+ * been overwritten if we're routing this message.
+ * Call lnet_return_tx_credits_locked() to return
+ * the credit this message consumed. The message will
+ * consume another credit when it gets resent.
+ */
+ msg->msg_target.nid = msg->msg_hdr.dest_nid;
+ lnet_msg_decommit_tx(msg, -EAGAIN);
+ msg->msg_sending = 0;
+ msg->msg_receiving = 0;
+ msg->msg_target_is_router = 0;
+
+ CDEBUG(D_NET, "%s->%s:%s:%s - queuing for resend\n",
+ libcfs_nid2str(msg->msg_hdr.src_nid),
+ libcfs_nid2str(msg->msg_hdr.dest_nid),
+ lnet_msgtyp2str(msg->msg_type),
+ lnet_health_error2str(hstatus));
+
+ list_add_tail(&msg->msg_list, the_lnet.ln_mt_resendqs[msg->msg_tx_cpt]);
+ lnet_net_unlock(msg->msg_tx_cpt);
+
+ wake_up(&the_lnet.ln_mt_waitq);
+ return 0;
+}
+
+static void
+lnet_detach_md(struct lnet_msg *msg, int status)
+{
+ int cpt = lnet_cpt_of_cookie(msg->msg_md->md_lh.lh_cookie);
+
+ lnet_res_lock(cpt);
+ lnet_msg_detach_md(msg, status);
+ lnet_res_unlock(cpt);
+}
+
+static bool
+lnet_is_health_check(struct lnet_msg *msg)
+{
+ bool hc;
+ int status = msg->msg_ev.status;
+
+ /*
+ * perform a health check for any message committed for transmit
+ */
+ hc = msg->msg_tx_committed;
+
+ /* Check for status inconsistencies */
+ if (hc &&
+ ((!status && msg->msg_health_status != LNET_MSG_STATUS_OK) ||
+ (status && msg->msg_health_status == LNET_MSG_STATUS_OK))) {
+ CERROR("Msg is in inconsistent state, don't perform health "
+ "checking (%d, %d)\n", status, msg->msg_health_status);
+ hc = false;
+ }
+
+ CDEBUG(D_NET, "health check = %d, status = %d, hstatus = %d\n",
+ hc, status, msg->msg_health_status);
+
+ return hc;
+}
+
+char *
+lnet_health_error2str(enum lnet_msg_hstatus hstatus)
+{
+ switch (hstatus) {
+ case LNET_MSG_STATUS_LOCAL_INTERRUPT:
+ return "LOCAL_INTERRUPT";
+ case LNET_MSG_STATUS_LOCAL_DROPPED:
+ return "LOCAL_DROPPED";
+ case LNET_MSG_STATUS_LOCAL_ABORTED:
+ return "LOCAL_ABORTED";
+ case LNET_MSG_STATUS_LOCAL_NO_ROUTE:
+ return "LOCAL_NO_ROUTE";
+ case LNET_MSG_STATUS_LOCAL_TIMEOUT:
+ return "LOCAL_TIMEOUT";
+ case LNET_MSG_STATUS_LOCAL_ERROR:
+ return "LOCAL_ERROR";
+ case LNET_MSG_STATUS_REMOTE_DROPPED:
+ return "REMOTE_DROPPED";
+ case LNET_MSG_STATUS_REMOTE_ERROR:
+ return "REMOTE_ERROR";
+ case LNET_MSG_STATUS_REMOTE_TIMEOUT:
+ return "REMOTE_TIMEOUT";
+ case LNET_MSG_STATUS_NETWORK_TIMEOUT:
+ return "NETWORK_TIMEOUT";
+ case LNET_MSG_STATUS_OK:
+ return "OK";
+ default:
+ return "<UNKNOWN>";
+ }
+}
+
+bool
+lnet_send_error_simulation(struct lnet_msg *msg,
+ enum lnet_msg_hstatus *hstatus)
+{
+ if (!msg)
+ return false;
+
+ if (list_empty(&the_lnet.ln_drop_rules))
+ return false;
+
+ /* match only health rules */
+ if (!lnet_drop_rule_match(&msg->msg_hdr, hstatus))
+ return false;
+
+ CDEBUG(D_NET, "src %s, dst %s: %s simulate health error: %s\n",
+ libcfs_nid2str(msg->msg_hdr.src_nid),
+ libcfs_nid2str(msg->msg_hdr.dest_nid),
+ lnet_msgtyp2str(msg->msg_type),
+ lnet_health_error2str(*hstatus));
+
+ return true;
+}
+EXPORT_SYMBOL(lnet_send_error_simulation);
+
+void
+lnet_finalize(struct lnet_msg *msg, int status)
+{
+ struct lnet_msg_container *container;
+ int my_slot;
+ int cpt;
+ int rc;
+ int i;
+ bool hc;
+
+ LASSERT(!in_interrupt());
+
+ if (msg == NULL)
+ return;
+
+ msg->msg_ev.status = status;
+
+ /*
+ * if this is an ACK or a REPLY then make sure to remove the
+ * response tracker.
+ */
+ if (msg->msg_ev.type == LNET_EVENT_REPLY ||
+ msg->msg_ev.type == LNET_EVENT_ACK) {
+ cpt = lnet_cpt_of_cookie(msg->msg_md->md_lh.lh_cookie);
+ lnet_detach_rsp_tracker(msg->msg_md, cpt);
+ }
+
+ /* if the message is successfully sent, no need to keep the MD around */
+ if (msg->msg_md != NULL && !status)
+ lnet_detach_md(msg, status);
+
+again:
+ hc = lnet_is_health_check(msg);
+
+ /*
+ * the MD would've been detached from the message if it was
+ * successfully sent. However, if it wasn't successfully sent the
+ * MD would be around. And since we recalculate whether to
+ * health check or not, it's possible that we change our minds and
+ * we don't want to health check this message. In this case also
+ * free the MD.
+ *
+ * If the message is successful we're going to
+ * go through the lnet_health_check() function, but that'll just
+ * increment the appropriate health value and return.
+ */
+ if (msg->msg_md != NULL && !hc)
+ lnet_detach_md(msg, status);
+
+ rc = 0;
+ if (!msg->msg_tx_committed && !msg->msg_rx_committed) {
+ /* not committed to network yet */
+ LASSERT(!msg->msg_onactivelist);
+ lnet_msg_free(msg);
+ return;
+ }
+
+ if (hc) {
+ /*
+ * Check the health status of the message. If it has one
+ * of the errors that we're supposed to handle, and it has
+ * not timed out, then
+ * 1. Decrement the appropriate health_value
+ * 2. queue the message on the resend queue
+
+ * if the message send is success, timed out or failed in the
+ * health check for any reason then we'll just finalize the
+ * message. Otherwise just return since the message has been
+ * put on the resend queue.
+ */
+ if (!lnet_health_check(msg))
+ return;
+
+ /*
+ * if we get here then we need to clean up the md because we're
+ * finalizing the message.
+ */
+ if (msg->msg_md != NULL)
+ lnet_detach_md(msg, status);
+ }
+
+ /*
+ * NB: routed message can be committed for both receiving and sending,
+ * we should finalize in LIFO order and keep counters correct.
+ * (finalize sending first then finalize receiving)
+ */
+ cpt = msg->msg_tx_committed ? msg->msg_tx_cpt : msg->msg_rx_cpt;
+ lnet_net_lock(cpt);
+
+ container = the_lnet.ln_msg_containers[cpt];
+ list_add_tail(&msg->msg_list, &container->msc_finalizing);
+
+ /* Recursion breaker. Don't complete the message here if I am (or
+ * enough other threads are) already completing messages */
+
+ my_slot = -1;
+ for (i = 0; i < container->msc_nfinalizers; i++) {
+ if (container->msc_finalizers[i] == current)
+ break;
+
+ if (my_slot < 0 && container->msc_finalizers[i] == NULL)
+ my_slot = i;
+ }
+
+ if (i < container->msc_nfinalizers || my_slot < 0) {
+ lnet_net_unlock(cpt);
+ return;
+ }
+
+ container->msc_finalizers[my_slot] = current;
+
+ while (!list_empty(&container->msc_finalizing)) {
+ msg = list_entry(container->msc_finalizing.next,
+ struct lnet_msg, msg_list);
+
+ list_del_init(&msg->msg_list);
+
+ /* NB drops and regains the lnet lock if it actually does
+ * anything, so my finalizing friends can chomp along too */
+ rc = lnet_complete_msg_locked(msg, cpt);
+ if (rc != 0)
+ break;
+ }
+
+ if (unlikely(!list_empty(&the_lnet.ln_delay_rules))) {
+ lnet_net_unlock(cpt);
+ lnet_delay_rule_check();
+ lnet_net_lock(cpt);
+ }
+
+ container->msc_finalizers[my_slot] = NULL;
+ lnet_net_unlock(cpt);
+
+ if (rc != 0)
+ goto again;
+}
+EXPORT_SYMBOL(lnet_finalize);
+
+void
+lnet_msg_container_cleanup(struct lnet_msg_container *container)
+{
+ int count = 0;
+
+ if (container->msc_init == 0)
+ return;
+
+ while (!list_empty(&container->msc_active)) {
+ struct lnet_msg *msg;
+
+ msg = list_entry(container->msc_active.next,
+ struct lnet_msg, msg_activelist);
+ LASSERT(msg->msg_onactivelist);
+ msg->msg_onactivelist = 0;
+ list_del_init(&msg->msg_activelist);
+ lnet_msg_free(msg);
+ count++;
+ }
+
+ if (count > 0)
+ CERROR("%d active msg on exit\n", count);
+
+ if (container->msc_finalizers != NULL) {
+ LIBCFS_FREE(container->msc_finalizers,
+ container->msc_nfinalizers *
+ sizeof(*container->msc_finalizers));
+ container->msc_finalizers = NULL;
+ }
+ container->msc_init = 0;
+}
+
+int
+lnet_msg_container_setup(struct lnet_msg_container *container, int cpt)
+{
+ int rc = 0;
+
+ container->msc_init = 1;
+
+ INIT_LIST_HEAD(&container->msc_active);
+ INIT_LIST_HEAD(&container->msc_finalizing);
+
+ /* number of CPUs */
+ container->msc_nfinalizers = cfs_cpt_weight(lnet_cpt_table(), cpt);
+ if (container->msc_nfinalizers == 0)
+ container->msc_nfinalizers = 1;
+
+ LIBCFS_CPT_ALLOC(container->msc_finalizers, lnet_cpt_table(), cpt,
+ container->msc_nfinalizers *
+ sizeof(*container->msc_finalizers));
+
+ if (container->msc_finalizers == NULL) {
+ CERROR("Failed to allocate message finalizers\n");
+ lnet_msg_container_cleanup(container);
+ return -ENOMEM;
+ }
+
+ return rc;
+}
+
+void
+lnet_msg_containers_destroy(void)
+{
+ struct lnet_msg_container *container;
+ int i;
+
+ if (the_lnet.ln_msg_containers == NULL)
+ return;
+
+ cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers)
+ lnet_msg_container_cleanup(container);
+
+ cfs_percpt_free(the_lnet.ln_msg_containers);
+ the_lnet.ln_msg_containers = NULL;
+}
+
+int
+lnet_msg_containers_create(void)
+{
+ struct lnet_msg_container *container;
+ int rc;
+ int i;
+
+ the_lnet.ln_msg_containers = cfs_percpt_alloc(lnet_cpt_table(),
+ sizeof(*container));
+
+ if (the_lnet.ln_msg_containers == NULL) {
+ CERROR("Failed to allocate cpu-partition data for network\n");
+ return -ENOMEM;
+ }
+
+ cfs_percpt_for_each(container, i, the_lnet.ln_msg_containers) {
+ rc = lnet_msg_container_setup(container, i);
+ if (rc != 0) {
+ lnet_msg_containers_destroy();
+ return rc;
+ }
+ }
+
+ return 0;
+}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff