* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2016, Intel Corporation.
+ * Copyright (c) 2012, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#define DEBUG_SUBSYSTEM S_LNET
+#include <linux/pagemap.h>
+
#include <lnet/lib-lnet.h>
#include <linux/nsproxy.h>
#include <net/net_namespace.h>
module_param(local_nid_dist_zero, int, 0444);
MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
+struct lnet_send_data {
+ struct lnet_ni *sd_best_ni;
+ struct lnet_peer_ni *sd_best_lpni;
+ struct lnet_peer_ni *sd_final_dst_lpni;
+ struct lnet_peer *sd_peer;
+ struct lnet_peer *sd_gw_peer;
+ struct lnet_peer_ni *sd_gw_lpni;
+ struct lnet_peer_net *sd_peer_net;
+ struct lnet_msg *sd_msg;
+ lnet_nid_t sd_dst_nid;
+ lnet_nid_t sd_src_nid;
+ lnet_nid_t sd_rtr_nid;
+ int sd_cpt;
+ int sd_md_cpt;
+ __u32 sd_send_case;
+};
+
+static inline struct lnet_comm_count *
+get_stats_counts(struct lnet_element_stats *stats,
+ enum lnet_stats_type stats_type)
+{
+ switch (stats_type) {
+ case LNET_STATS_TYPE_SEND:
+ return &stats->el_send_stats;
+ case LNET_STATS_TYPE_RECV:
+ return &stats->el_recv_stats;
+ case LNET_STATS_TYPE_DROP:
+ return &stats->el_drop_stats;
+ default:
+ CERROR("Unknown stats type\n");
+ }
+
+ return NULL;
+}
+
+void lnet_incr_stats(struct lnet_element_stats *stats,
+ enum lnet_msg_type msg_type,
+ enum lnet_stats_type stats_type)
+{
+ struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
+ if (!counts)
+ return;
+
+ switch (msg_type) {
+ case LNET_MSG_ACK:
+ atomic_inc(&counts->co_ack_count);
+ break;
+ case LNET_MSG_PUT:
+ atomic_inc(&counts->co_put_count);
+ break;
+ case LNET_MSG_GET:
+ atomic_inc(&counts->co_get_count);
+ break;
+ case LNET_MSG_REPLY:
+ atomic_inc(&counts->co_reply_count);
+ break;
+ case LNET_MSG_HELLO:
+ atomic_inc(&counts->co_hello_count);
+ break;
+ default:
+ CERROR("There is a BUG in the code. Unknown message type\n");
+ break;
+ }
+}
+
+__u32 lnet_sum_stats(struct lnet_element_stats *stats,
+ enum lnet_stats_type stats_type)
+{
+ struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
+ if (!counts)
+ return 0;
+
+ return (atomic_read(&counts->co_ack_count) +
+ atomic_read(&counts->co_put_count) +
+ atomic_read(&counts->co_get_count) +
+ atomic_read(&counts->co_reply_count) +
+ atomic_read(&counts->co_hello_count));
+}
+
+static inline void assign_stats(struct lnet_ioctl_comm_count *msg_stats,
+ struct lnet_comm_count *counts)
+{
+ msg_stats->ico_get_count = atomic_read(&counts->co_get_count);
+ msg_stats->ico_put_count = atomic_read(&counts->co_put_count);
+ msg_stats->ico_reply_count = atomic_read(&counts->co_reply_count);
+ msg_stats->ico_ack_count = atomic_read(&counts->co_ack_count);
+ msg_stats->ico_hello_count = atomic_read(&counts->co_hello_count);
+}
+
+void lnet_usr_translate_stats(struct lnet_ioctl_element_msg_stats *msg_stats,
+ struct lnet_element_stats *stats)
+{
+ struct lnet_comm_count *counts;
+
+ LASSERT(msg_stats);
+ LASSERT(stats);
+
+ counts = get_stats_counts(stats, LNET_STATS_TYPE_SEND);
+ if (!counts)
+ return;
+ assign_stats(&msg_stats->im_send_stats, counts);
+
+ counts = get_stats_counts(stats, LNET_STATS_TYPE_RECV);
+ if (!counts)
+ return;
+ assign_stats(&msg_stats->im_recv_stats, counts);
+
+ counts = get_stats_counts(stats, LNET_STATS_TYPE_DROP);
+ if (!counts)
+ return;
+ assign_stats(&msg_stats->im_drop_stats, counts);
+}
+
int
lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
{
memset (&msg->msg_hdr, 0, sizeof (msg->msg_hdr));
msg->msg_hdr.type = cpu_to_le32(type);
+ /* dest_nid will be overwritten by lnet_select_pathway() */
+ msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
/* src_nid will be set later */
msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
lnet_ni_send(struct lnet_ni *ni, struct lnet_msg *msg)
{
void *priv = msg->msg_private;
- int rc;
+ int rc;
LASSERT (!in_interrupt ());
LASSERT (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
(msg->msg_txcredit && msg->msg_peertxcredit));
rc = (ni->ni_net->net_lnd->lnd_send)(ni, priv, msg);
- if (rc < 0)
+ if (rc < 0) {
+ msg->msg_no_resend = true;
lnet_finalize(msg, rc);
+ }
}
static int
static void
lnet_ni_query_locked(struct lnet_ni *ni, struct lnet_peer_ni *lp)
{
- cfs_time_t last_alive = 0;
+ time64_t last_alive = 0;
int cpt = lnet_cpt_of_nid_locked(lp->lpni_nid, ni);
LASSERT(lnet_peer_aliveness_enabled(lp));
(ni->ni_net->net_lnd->lnd_query)(ni, lp->lpni_nid, &last_alive);
lnet_net_lock(cpt);
- lp->lpni_last_query = cfs_time_current();
+ lp->lpni_last_query = ktime_get_seconds();
if (last_alive != 0) /* NI has updated timestamp */
lp->lpni_last_alive = last_alive;
/* NB: always called with lnet_net_lock held */
static inline int
-lnet_peer_is_alive (struct lnet_peer_ni *lp, cfs_time_t now)
+lnet_peer_is_alive(struct lnet_peer_ni *lp, time64_t now)
{
- int alive;
- cfs_time_t deadline;
+ int alive;
+ time64_t deadline;
LASSERT (lnet_peer_aliveness_enabled(lp));
*/
spin_lock(&lp->lpni_lock);
if (!lp->lpni_alive && lp->lpni_alive_count > 0 &&
- cfs_time_aftereq(lp->lpni_timestamp, lp->lpni_last_alive)) {
+ lp->lpni_timestamp >= lp->lpni_last_alive) {
spin_unlock(&lp->lpni_lock);
return 0;
}
- deadline =
- cfs_time_add(lp->lpni_last_alive,
- cfs_time_seconds(lp->lpni_net->net_tunables.
- lct_peer_timeout));
- alive = cfs_time_after(deadline, now);
+ deadline = lp->lpni_last_alive +
+ lp->lpni_net->net_tunables.lct_peer_timeout;
+ alive = deadline > now;
/*
* Update obsolete lp_alive except for routers assumed to be dead
/* NB: returns 1 when alive, 0 when dead, negative when error;
* may drop the lnet_net_lock */
static int
-lnet_peer_alive_locked (struct lnet_ni *ni, struct lnet_peer_ni *lp)
+lnet_peer_alive_locked(struct lnet_ni *ni, struct lnet_peer_ni *lp,
+ struct lnet_msg *msg)
{
- cfs_time_t now = cfs_time_current();
+ time64_t now = ktime_get_seconds();
if (!lnet_peer_aliveness_enabled(lp))
return -ENODEV;
return 1;
/*
+ * If we're resending a message, let's attempt to send it even if
+ * the peer is down to fulfill our resend quota on the message
+ */
+ if (msg->msg_retry_count > 0)
+ return 1;
+
+ /*
* Peer appears dead, but we should avoid frequent NI queries (at
* most once per lnet_queryinterval seconds).
*/
if (lp->lpni_last_query != 0) {
static const int lnet_queryinterval = 1;
+ time64_t next_query;
- cfs_time_t next_query =
- cfs_time_add(lp->lpni_last_query,
- cfs_time_seconds(lnet_queryinterval));
+ next_query = lp->lpni_last_query + lnet_queryinterval;
- if (cfs_time_before(now, next_query)) {
+ if (now < next_query) {
if (lp->lpni_alive)
CWARN("Unexpected aliveness of peer %s: "
- "%d < %d (%d/%d)\n",
+ "%lld < %lld (%d/%d)\n",
libcfs_nid2str(lp->lpni_nid),
- (int)now, (int)next_query,
+ now, next_query,
lnet_queryinterval,
lp->lpni_net->net_tunables.lct_peer_timeout);
return 0;
/* NB 'lp' is always the next hop */
if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
- lnet_peer_alive_locked(ni, lp) == 0) {
- the_lnet.ln_counters[cpt]->drop_count++;
- the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
+ lnet_peer_alive_locked(ni, lp, msg) == 0) {
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length +=
+ msg->msg_len;
lnet_net_unlock(cpt);
if (msg->msg_txpeer)
- atomic_inc(&msg->msg_txpeer->lpni_stats.drop_count);
+ lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_DROP);
if (msg->msg_txni)
- atomic_inc(&msg->msg_txni->ni_stats.drop_count);
+ lnet_incr_stats(&msg->msg_txni->ni_stats,
+ msg->msg_type,
+ LNET_STATS_TYPE_DROP);
CNETERR("Dropping message for %s: peer not alive\n",
libcfs_id2str(msg->msg_target));
+ msg->msg_health_status = LNET_MSG_STATUS_LOCAL_DROPPED;
if (do_send)
lnet_finalize(msg, -EHOSTUNREACH);
CNETERR("Aborting message for %s: LNetM[DE]Unlink() already "
"called on the MD/ME.\n",
libcfs_id2str(msg->msg_target));
- if (do_send)
+ if (do_send) {
+ msg->msg_no_resend = true;
lnet_finalize(msg, -ECANCELED);
+ }
lnet_net_lock(cpt);
return -ECANCELED;
}
}
+ /* unset the tx_delay flag as we're going to send it now */
+ msg->msg_tx_delayed = 0;
+
if (do_send) {
lnet_net_unlock(cpt);
lnet_ni_send(ni, msg);
msg->msg_niov = rbp->rbp_npages;
msg->msg_kiov = &rb->rb_kiov[0];
+ /* unset the msg-rx_delayed flag since we're receiving the message */
+ msg->msg_rx_delayed = 0;
+
if (do_recv) {
int cpt = msg->msg_rx_cpt;
txpeer->lpni_txcredits++;
if (txpeer->lpni_txcredits <= 0) {
+ int msg2_cpt;
+
msg2 = list_entry(txpeer->lpni_txq.next,
struct lnet_msg, msg_list);
list_del(&msg2->msg_list);
LASSERT(msg2->msg_txpeer == txpeer);
LASSERT(msg2->msg_tx_delayed);
- if (msg2->msg_tx_cpt != msg->msg_tx_cpt) {
+ msg2_cpt = msg2->msg_tx_cpt;
+
+ /*
+ * The msg_cpt can be different from the msg2_cpt
+ * so we need to make sure we lock the correct cpt
+ * for msg2.
+ * Once we call lnet_post_send_locked() it is no
+ * longer safe to access msg2, since it could've
+ * been freed by lnet_finalize(), but we still
+ * need to relock the correct cpt, so we cache the
+ * msg2_cpt for the purpose of the check that
+ * follows the call to lnet_pose_send_locked().
+ */
+ if (msg2_cpt != msg->msg_tx_cpt) {
lnet_net_unlock(msg->msg_tx_cpt);
- lnet_net_lock(msg2->msg_tx_cpt);
+ lnet_net_lock(msg2_cpt);
}
(void) lnet_post_send_locked(msg2, 1);
- if (msg2->msg_tx_cpt != msg->msg_tx_cpt) {
- lnet_net_unlock(msg2->msg_tx_cpt);
+ if (msg2_cpt != msg->msg_tx_cpt) {
+ lnet_net_unlock(msg2_cpt);
lnet_net_lock(msg->msg_tx_cpt);
}
} else {
}
if (txpeer != NULL) {
- /*
- * TODO:
- * Once the patch for the health comes in we need to set
- * the health of the peer ni to bad when we fail to send
- * a message.
- * int status = msg->msg_ev.status;
- * if (status != 0)
- * lnet_set_peer_ni_health_locked(txpeer, false)
- */
msg->msg_txpeer = NULL;
lnet_peer_ni_decref_locked(txpeer);
}
lnet_ni_recv(msg->msg_rxni, msg->msg_private, NULL,
0, 0, 0, msg->msg_hdr.payload_length);
list_del_init(&msg->msg_list);
+ msg->msg_no_resend = true;
lnet_finalize(msg, -ECANCELED);
}
}
static struct lnet_peer_ni *
-lnet_find_route_locked(struct lnet_net *net, lnet_nid_t target,
+lnet_find_route_locked(struct lnet_net *net, __u32 remote_net,
lnet_nid_t rtr_nid)
{
struct lnet_remotenet *rnet;
/* If @rtr_nid is not LNET_NID_ANY, return the gateway with
* rtr_nid nid, otherwise find the best gateway I can use */
- rnet = lnet_find_rnet_locked(LNET_NIDNET(target));
+ rnet = lnet_find_rnet_locked(remote_net);
if (rnet == NULL)
return NULL;
}
static struct lnet_ni *
-lnet_get_best_ni(struct lnet_net *local_net, struct lnet_ni *cur_ni,
+lnet_get_best_ni(struct lnet_net *local_net, struct lnet_ni *best_ni,
+ struct lnet_peer *peer, struct lnet_peer_net *peer_net,
int md_cpt)
{
- struct lnet_ni *ni = NULL, *best_ni = cur_ni;
+ struct lnet_ni *ni = NULL;
unsigned int shortest_distance;
int best_credits;
+ int best_healthv;
+
+ /*
+ * If there is no peer_ni that we can send to on this network,
+ * then there is no point in looking for a new best_ni here.
+ */
+ if (!lnet_get_next_peer_ni_locked(peer, peer_net, NULL))
+ return best_ni;
if (best_ni == NULL) {
shortest_distance = UINT_MAX;
best_credits = INT_MIN;
+ best_healthv = 0;
} else {
shortest_distance = cfs_cpt_distance(lnet_cpt_table(), md_cpt,
best_ni->ni_dev_cpt);
best_credits = atomic_read(&best_ni->ni_tx_credits);
+ best_healthv = atomic_read(&best_ni->ni_healthv);
}
while ((ni = lnet_get_next_ni_locked(local_net, ni))) {
unsigned int distance;
int ni_credits;
-
- if (!lnet_is_ni_healthy_locked(ni))
- continue;
+ int ni_healthv;
+ int ni_fatal;
ni_credits = atomic_read(&ni->ni_tx_credits);
+ ni_healthv = atomic_read(&ni->ni_healthv);
+ ni_fatal = atomic_read(&ni->ni_fatal_error_on);
/*
* calculate the distance from the CPT on which
md_cpt,
ni->ni_dev_cpt);
+ CDEBUG(D_NET, "compare ni %s [c:%d, d:%d, s:%d] with best_ni %s [c:%d, d:%d, s:%d]\n",
+ libcfs_nid2str(ni->ni_nid), ni_credits, distance,
+ ni->ni_seq, (best_ni) ? libcfs_nid2str(best_ni->ni_nid)
+ : "not seleced", best_credits, shortest_distance,
+ (best_ni) ? best_ni->ni_seq : 0);
+
/*
* All distances smaller than the NUMA range
* are treated equally.
distance = lnet_numa_range;
/*
- * Select on shorter distance, then available
+ * Select on health, shorter distance, available
* credits, then round-robin.
*/
- if (distance > shortest_distance) {
+ if (ni_fatal) {
+ continue;
+ } else if (ni_healthv < best_healthv) {
+ continue;
+ } else if (ni_healthv > best_healthv) {
+ best_healthv = ni_healthv;
+ /*
+ * If we're going to prefer this ni because it's
+ * the healthiest, then we should set the
+ * shortest_distance in the algorithm in case
+ * there are multiple NIs with the same health but
+ * different distances.
+ */
+ if (distance < shortest_distance)
+ shortest_distance = distance;
+ } else if (distance > shortest_distance) {
continue;
} else if (distance < shortest_distance) {
shortest_distance = distance;
} else if (ni_credits < best_credits) {
continue;
} else if (ni_credits == best_credits) {
- if (best_ni && (best_ni)->ni_seq <= ni->ni_seq)
+ if (best_ni && best_ni->ni_seq <= ni->ni_seq)
continue;
}
best_ni = ni;
best_credits = ni_credits;
}
+ CDEBUG(D_NET, "selected best_ni %s\n",
+ (best_ni) ? libcfs_nid2str(best_ni->ni_nid) : "no selection");
+
return best_ni;
}
-static int
-lnet_select_pathway(lnet_nid_t src_nid, lnet_nid_t dst_nid,
- struct lnet_msg *msg, lnet_nid_t rtr_nid)
+/*
+ * Traffic to the LNET_RESERVED_PORTAL may not trigger peer discovery,
+ * because such traffic is required to perform discovery. We therefore
+ * exclude all GET and PUT on that portal. We also exclude all ACK and
+ * REPLY traffic, but that is because the portal is not tracked in the
+ * message structure for these message types. We could restrict this
+ * further by also checking for LNET_PROTO_PING_MATCHBITS.
+ */
+static bool
+lnet_msg_discovery(struct lnet_msg *msg)
{
- struct lnet_ni *best_ni;
- struct lnet_peer_ni *best_lpni;
- struct lnet_peer_ni *best_gw;
- struct lnet_peer_ni *lpni;
- struct lnet_peer_ni *final_dst;
- struct lnet_peer *peer;
- struct lnet_peer_net *peer_net;
- struct lnet_net *local_net;
- __u32 seq;
- int cpt, cpt2, rc;
- bool routing;
- bool routing2;
- bool ni_is_pref;
- bool preferred;
- bool local_found;
- int best_lpni_credits;
- int md_cpt;
-
- /*
- * get an initial CPT to use for locking. The idea here is not to
- * serialize the calls to select_pathway, so that as many
- * operations can run concurrently as possible. To do that we use
- * the CPT where this call is being executed. Later on when we
- * determine the CPT to use in lnet_message_commit, we switch the
- * lock and check if there was any configuration change. If none,
- * then we proceed, if there is, then we restart the operation.
- */
- cpt = lnet_net_lock_current();
-
- md_cpt = lnet_cpt_of_md(msg->msg_md);
- if (md_cpt == CFS_CPT_ANY)
- md_cpt = cpt;
-
-again:
- best_ni = NULL;
- best_lpni = NULL;
- best_gw = NULL;
- final_dst = NULL;
- local_net = NULL;
- routing = false;
- routing2 = false;
- local_found = false;
-
- seq = lnet_get_dlc_seq_locked();
-
- if (the_lnet.ln_state != LNET_STATE_RUNNING) {
- lnet_net_unlock(cpt);
- return -ESHUTDOWN;
+ if (msg->msg_type == LNET_MSG_PUT) {
+ if (msg->msg_hdr.msg.put.ptl_index != LNET_RESERVED_PORTAL)
+ return true;
+ } else if (msg->msg_type == LNET_MSG_GET) {
+ if (msg->msg_hdr.msg.get.ptl_index != LNET_RESERVED_PORTAL)
+ return true;
}
+ return false;
+}
- peer = lnet_find_or_create_peer_locked(dst_nid, cpt);
- if (IS_ERR(peer)) {
- lnet_net_unlock(cpt);
- return PTR_ERR(peer);
- }
+#define SRC_SPEC 0x0001
+#define SRC_ANY 0x0002
+#define LOCAL_DST 0x0004
+#define REMOTE_DST 0x0008
+#define MR_DST 0x0010
+#define NMR_DST 0x0020
+#define SND_RESP 0x0040
+
+/* The following to defines are used for return codes */
+#define REPEAT_SEND 0x1000
+#define PASS_THROUGH 0x2000
+
+/* The different cases lnet_select pathway needs to handle */
+#define SRC_SPEC_LOCAL_MR_DST (SRC_SPEC | LOCAL_DST | MR_DST)
+#define SRC_SPEC_ROUTER_MR_DST (SRC_SPEC | REMOTE_DST | MR_DST)
+#define SRC_SPEC_LOCAL_NMR_DST (SRC_SPEC | LOCAL_DST | NMR_DST)
+#define SRC_SPEC_ROUTER_NMR_DST (SRC_SPEC | REMOTE_DST | NMR_DST)
+#define SRC_ANY_LOCAL_MR_DST (SRC_ANY | LOCAL_DST | MR_DST)
+#define SRC_ANY_ROUTER_MR_DST (SRC_ANY | REMOTE_DST | MR_DST)
+#define SRC_ANY_LOCAL_NMR_DST (SRC_ANY | LOCAL_DST | NMR_DST)
+#define SRC_ANY_ROUTER_NMR_DST (SRC_ANY | REMOTE_DST | NMR_DST)
- /* If peer is not healthy then can not send anything to it */
- if (!lnet_is_peer_healthy_locked(peer)) {
- lnet_net_unlock(cpt);
- return -EHOSTUNREACH;
- }
+static int
+lnet_handle_send(struct lnet_send_data *sd)
+{
+ struct lnet_ni *best_ni = sd->sd_best_ni;
+ struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
+ struct lnet_peer_ni *final_dst_lpni = sd->sd_final_dst_lpni;
+ struct lnet_msg *msg = sd->sd_msg;
+ int cpt2;
+ __u32 send_case = sd->sd_send_case;
+ int rc;
+ __u32 routing = send_case & REMOTE_DST;
+ struct lnet_rsp_tracker *rspt;
- if (!peer->lp_multi_rail && lnet_get_num_peer_nis(peer) > 1) {
- CERROR("peer %s is declared to be non MR capable, "
- "yet configured with more than one NID\n",
- libcfs_nid2str(dst_nid));
- return -EINVAL;
- }
+ /*
+ * Increment sequence number of the selected peer so that we
+ * pick the next one in Round Robin.
+ */
+ best_lpni->lpni_seq++;
/*
- * STEP 1: first jab at determining best_ni
- * if src_nid is explicitly specified, then best_ni is already
- * pre-determiend for us. Otherwise we need to select the best
- * one to use later on
+ * grab a reference on the peer_ni so it sticks around even if
+ * we need to drop and relock the lnet_net_lock below.
*/
- if (src_nid != LNET_NID_ANY) {
- best_ni = lnet_nid2ni_locked(src_nid, cpt);
- if (!best_ni) {
- lnet_net_unlock(cpt);
- LCONSOLE_WARN("Can't send to %s: src %s is not a "
- "local nid\n", libcfs_nid2str(dst_nid),
- libcfs_nid2str(src_nid));
- return -EINVAL;
- }
- }
+ lnet_peer_ni_addref_locked(best_lpni);
- if (msg->msg_type == LNET_MSG_REPLY ||
- msg->msg_type == LNET_MSG_ACK ||
- !peer->lp_multi_rail ||
- best_ni) {
- /*
- * for replies we want to respond on the same peer_ni we
- * received the message on if possible. If not, then pick
- * a peer_ni to send to
- *
- * if the peer is non-multi-rail then you want to send to
- * the dst_nid provided as well.
- *
- * If the best_ni has already been determined, IE the
- * src_nid has been specified, then use the
- * destination_nid provided as well, since we're
- * continuing a series of related messages for the same
- * RPC.
- *
- * It is expected to find the lpni using dst_nid, since we
- * created it earlier.
- */
- best_lpni = lnet_find_peer_ni_locked(dst_nid);
- if (best_lpni)
+ /*
+ * Use lnet_cpt_of_nid() to determine the CPT used to commit the
+ * message. This ensures that we get a CPT that is correct for
+ * the NI when the NI has been restricted to a subset of all CPTs.
+ * If the selected CPT differs from the one currently locked, we
+ * must unlock and relock the lnet_net_lock(), and then check whether
+ * the configuration has changed. We don't have a hold on the best_ni
+ * yet, and it may have vanished.
+ */
+ cpt2 = lnet_cpt_of_nid_locked(best_lpni->lpni_nid, best_ni);
+ if (sd->sd_cpt != cpt2) {
+ __u32 seq = lnet_get_dlc_seq_locked();
+ lnet_net_unlock(sd->sd_cpt);
+ sd->sd_cpt = cpt2;
+ lnet_net_lock(sd->sd_cpt);
+ if (seq != lnet_get_dlc_seq_locked()) {
lnet_peer_ni_decref_locked(best_lpni);
-
- if (best_lpni && !lnet_get_net_locked(LNET_NIDNET(dst_nid))) {
- /*
- * this lpni is not on a local network so we need
- * to route this reply.
- */
- best_gw = lnet_find_route_locked(NULL,
- best_lpni->lpni_nid,
- rtr_nid);
- if (best_gw) {
- /*
- * RULE: Each node considers only the next-hop
- *
- * We're going to route the message, so change the peer to
- * the router.
- */
- LASSERT(best_gw->lpni_peer_net);
- LASSERT(best_gw->lpni_peer_net->lpn_peer);
- peer = best_gw->lpni_peer_net->lpn_peer;
-
- /*
- * if the router is not multi-rail then use the best_gw
- * found to send the message to
- */
- if (!peer->lp_multi_rail)
- best_lpni = best_gw;
- else
- best_lpni = NULL;
-
- routing = true;
- } else {
- best_lpni = NULL;
- }
- } else if (!best_lpni) {
- lnet_net_unlock(cpt);
- CERROR("unable to send msg_type %d to "
- "originating %s. Destination NID not in DB\n",
- msg->msg_type, libcfs_nid2str(dst_nid));
- return -EINVAL;
+ return REPEAT_SEND;
}
}
/*
- * if the peer is not MR capable, then we should always send to it
- * using the first NI in the NET we determined.
+ * store the best_lpni in the message right away to avoid having
+ * to do the same operation under different conditions
*/
- if (!peer->lp_multi_rail) {
- if (!best_lpni) {
- lnet_net_unlock(cpt);
- CERROR("no route to %s\n",
- libcfs_nid2str(dst_nid));
- return -EHOSTUNREACH;
- }
-
- /* best ni could be set because src_nid was provided */
- if (!best_ni) {
- best_ni = lnet_net2ni_locked(best_lpni->lpni_net->net_id, cpt);
- if (!best_ni) {
- lnet_net_unlock(cpt);
- CERROR("no path to %s from net %s\n",
- libcfs_nid2str(best_lpni->lpni_nid),
- libcfs_net2str(best_lpni->lpni_net->net_id));
- return -EHOSTUNREACH;
- }
- }
- }
-
- if (best_ni == the_lnet.ln_loni) {
- /* No send credit hassles with LOLND */
- lnet_ni_addref_locked(best_ni, cpt);
- msg->msg_hdr.dest_nid = cpu_to_le64(best_ni->ni_nid);
- if (!msg->msg_routing)
- msg->msg_hdr.src_nid = cpu_to_le64(best_ni->ni_nid);
- msg->msg_target.nid = best_ni->ni_nid;
- lnet_msg_commit(msg, cpt);
- msg->msg_txni = best_ni;
- lnet_net_unlock(cpt);
-
- return LNET_CREDIT_OK;
- }
+ msg->msg_txpeer = best_lpni;
+ msg->msg_txni = best_ni;
/*
- * if we already found a best_ni because src_nid is specified and
- * best_lpni because we are replying to a message then just send
- * the message
+ * grab a reference for the best_ni since now it's in use in this
+ * send. The reference will be dropped in lnet_finalize()
*/
- if (best_ni && best_lpni)
- goto send;
+ lnet_ni_addref_locked(msg->msg_txni, sd->sd_cpt);
/*
- * If we already found a best_ni because src_nid is specified then
- * pick the peer then send the message
+ * Always set the target.nid to the best peer picked. Either the
+ * NID will be one of the peer NIDs selected, or the same NID as
+ * what was originally set in the target or it will be the NID of
+ * a router if this message should be routed
*/
- if (best_ni)
- goto pick_peer;
+ msg->msg_target.nid = msg->msg_txpeer->lpni_nid;
/*
- * pick the best_ni by going through all the possible networks of
- * that peer and see which local NI is best suited to talk to that
- * peer.
- *
- * Locally connected networks will always be preferred over
- * a routed network. If there are only routed paths to the peer,
- * then the best route is chosen. If all routes are equal then
- * they are used in round robin.
+ * lnet_msg_commit assigns the correct cpt to the message, which
+ * is used to decrement the correct refcount on the ni when it's
+ * time to return the credits
*/
- list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_on_peer_list) {
- if (!lnet_is_peer_net_healthy_locked(peer_net))
- continue;
-
- local_net = lnet_get_net_locked(peer_net->lpn_net_id);
- if (!local_net && !routing && !local_found) {
- struct lnet_peer_ni *net_gw;
-
- lpni = list_entry(peer_net->lpn_peer_nis.next,
- struct lnet_peer_ni,
- lpni_on_peer_net_list);
-
- net_gw = lnet_find_route_locked(NULL,
- lpni->lpni_nid,
- rtr_nid);
- if (!net_gw)
- continue;
-
- if (best_gw) {
- /*
- * lnet_find_route_locked() call
- * will return the best_Gw on the
- * lpni->lpni_nid network.
- * However, best_gw and net_gw can
- * be on different networks.
- * Therefore need to compare them
- * to pick the better of either.
- */
- if (lnet_compare_peers(best_gw, net_gw) > 0)
- continue;
- if (best_gw->lpni_gw_seq <= net_gw->lpni_gw_seq)
- continue;
- }
- best_gw = net_gw;
- final_dst = lpni;
-
- routing2 = true;
- } else {
- best_gw = NULL;
- final_dst = NULL;
- routing2 = false;
- local_found = true;
- }
-
- /*
- * a gw on this network is found, but there could be
- * other better gateways on other networks. So don't pick
- * the best_ni until we determine the best_gw.
- */
- if (best_gw)
- continue;
+ lnet_msg_commit(msg, sd->sd_cpt);
- /* if no local_net found continue */
- if (!local_net)
- continue;
+ /*
+ * If we are routing the message then we keep the src_nid that was
+ * set by the originator. If we are not routing then we are the
+ * originator and set it here.
+ */
+ if (!msg->msg_routing)
+ msg->msg_hdr.src_nid = cpu_to_le64(msg->msg_txni->ni_nid);
+ if (routing) {
+ msg->msg_target_is_router = 1;
+ msg->msg_target.pid = LNET_PID_LUSTRE;
/*
- * Iterate through the NIs in this local Net and select
- * the NI to send from. The selection is determined by
- * these 3 criterion in the following priority:
- * 1. NUMA
- * 2. NI available credits
- * 3. Round Robin
+ * since we're routing we want to ensure that the
+ * msg_hdr.dest_nid is set to the final destination. When
+ * the router receives this message it knows how to route
+ * it.
+ *
+ * final_dst_lpni is set at the beginning of the
+ * lnet_select_pathway() function and is never changed.
+ * It's safe to use it here.
*/
- best_ni = lnet_get_best_ni(local_net, best_ni, md_cpt);
- }
-
- if (!best_ni && !best_gw) {
- lnet_net_unlock(cpt);
- LCONSOLE_WARN("No local ni found to send from to %s\n",
- libcfs_nid2str(dst_nid));
- return -EINVAL;
- }
-
- if (!best_ni) {
- best_ni = lnet_get_best_ni(best_gw->lpni_net, best_ni, md_cpt);
- LASSERT(best_gw && best_ni);
-
+ msg->msg_hdr.dest_nid = cpu_to_le64(final_dst_lpni->lpni_nid);
+ } else {
/*
- * We're going to route the message, so change the peer to
- * the router.
+ * if we're not routing set the dest_nid to the best peer
+ * ni NID that we picked earlier in the algorithm.
*/
- LASSERT(best_gw->lpni_peer_net);
- LASSERT(best_gw->lpni_peer_net->lpn_peer);
- best_gw->lpni_gw_seq++;
- peer = best_gw->lpni_peer_net->lpn_peer;
+ msg->msg_hdr.dest_nid = cpu_to_le64(msg->msg_txpeer->lpni_nid);
}
/*
- * Now that we selected the NI to use increment its sequence
- * number so the Round Robin algorithm will detect that it has
- * been used and pick the next NI.
+ * if we have response tracker block update it with the next hop
+ * nid
*/
- best_ni->ni_seq++;
-
-pick_peer:
- /*
- * At this point the best_ni is on a local network on which
- * the peer has a peer_ni as well
- */
- peer_net = lnet_peer_get_net_locked(peer,
- best_ni->ni_net->net_id);
- /*
- * peer_net is not available or the src_nid is explicitly defined
- * and the peer_net for that src_nid is unhealthy. find a route to
- * the destination nid.
- */
- if (!peer_net ||
- (src_nid != LNET_NID_ANY &&
- !lnet_is_peer_net_healthy_locked(peer_net))) {
- best_gw = lnet_find_route_locked(best_ni->ni_net,
- dst_nid,
- rtr_nid);
- /*
- * if no route is found for that network then
- * move onto the next peer_ni in the peer
- */
- if (!best_gw) {
- lnet_net_unlock(cpt);
- LCONSOLE_WARN("No route to peer from %s\n",
- libcfs_nid2str(best_ni->ni_nid));
- return -EHOSTUNREACH;
+ if (msg->msg_md) {
+ rspt = msg->msg_md->md_rspt_ptr;
+ if (rspt) {
+ rspt->rspt_next_hop_nid = msg->msg_txpeer->lpni_nid;
+ CDEBUG(D_NET, "rspt_next_hop_nid = %s\n",
+ libcfs_nid2str(rspt->rspt_next_hop_nid));
}
+ }
- CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
- libcfs_nid2str(dst_nid),
- libcfs_nid2str(best_gw->lpni_nid),
- lnet_msgtyp2str(msg->msg_type), msg->msg_len);
+ rc = lnet_post_send_locked(msg, 0);
- routing2 = true;
- /*
- * RULE: Each node considers only the next-hop
- *
- * We're going to route the message, so change the peer to
- * the router.
- */
- LASSERT(best_gw->lpni_peer_net);
- LASSERT(best_gw->lpni_peer_net->lpn_peer);
- peer = best_gw->lpni_peer_net->lpn_peer;
- } else if (!lnet_is_peer_net_healthy_locked(peer_net)) {
- /*
- * this peer_net is unhealthy but we still have an opportunity
- * to find another peer_net that we can use
- */
- __u32 net_id = peer_net->lpn_net_id;
- LCONSOLE_WARN("peer net %s unhealthy\n",
- libcfs_net2str(net_id));
- goto again;
- }
+ if (!rc)
+ CDEBUG(D_NET, "TRACE: %s(%s:%s) -> %s(%s:%s) : %s try# %d\n",
+ libcfs_nid2str(msg->msg_hdr.src_nid),
+ libcfs_nid2str(msg->msg_txni->ni_nid),
+ libcfs_nid2str(sd->sd_src_nid),
+ libcfs_nid2str(msg->msg_hdr.dest_nid),
+ libcfs_nid2str(sd->sd_dst_nid),
+ libcfs_nid2str(msg->msg_txpeer->lpni_nid),
+ lnet_msgtyp2str(msg->msg_type), msg->msg_retry_count);
+
+ return rc;
+}
+static struct lnet_peer_ni *
+lnet_select_peer_ni(struct lnet_send_data *sd, struct lnet_peer *peer,
+ struct lnet_peer_net *peer_net)
+{
/*
* Look at the peer NIs for the destination peer that connect
* to the chosen net. If a peer_ni is preferred when using the
* the available transmit credits are used. If the transmit
* credits are equal, we round-robin over the peer_ni.
*/
- lpni = NULL;
- best_lpni_credits = INT_MIN;
- preferred = false;
- best_lpni = NULL;
+ struct lnet_peer_ni *lpni = NULL;
+ struct lnet_peer_ni *best_lpni = NULL;
+ struct lnet_ni *best_ni = sd->sd_best_ni;
+ lnet_nid_t dst_nid = sd->sd_dst_nid;
+ int best_lpni_credits = INT_MIN;
+ bool preferred = false;
+ bool ni_is_pref;
+ int best_lpni_healthv = 0;
+ int lpni_healthv;
+
while ((lpni = lnet_get_next_peer_ni_locked(peer, peer_net, lpni))) {
/*
- * if this peer ni is not healthy just skip it, no point in
- * examining it further
+ * if the best_ni we've chosen aleady has this lpni
+ * preferred, then let's use it
*/
- if (!lnet_is_peer_ni_healthy_locked(lpni))
- continue;
- ni_is_pref = lnet_peer_is_ni_pref_locked(lpni, best_ni);
+ ni_is_pref = lnet_peer_is_pref_nid_locked(lpni,
+ best_ni->ni_nid);
+
+ lpni_healthv = atomic_read(&lpni->lpni_healthv);
+
+ CDEBUG(D_NET, "%s ni_is_pref = %d\n",
+ libcfs_nid2str(best_ni->ni_nid), ni_is_pref);
+ if (best_lpni)
+ CDEBUG(D_NET, "%s c:[%d, %d], s:[%d, %d]\n",
+ libcfs_nid2str(lpni->lpni_nid),
+ lpni->lpni_txcredits, best_lpni_credits,
+ lpni->lpni_seq, best_lpni->lpni_seq);
+
+ /* pick the healthiest peer ni */
+ if (lpni_healthv < best_lpni_healthv) {
+ continue;
+ } else if (lpni_healthv > best_lpni_healthv) {
+ best_lpni_healthv = lpni_healthv;
/* if this is a preferred peer use it */
- if (!preferred && ni_is_pref) {
+ } else if (!preferred && ni_is_pref) {
preferred = true;
} else if (preferred && !ni_is_pref) {
/*
if (!best_lpni) {
__u32 net_id = (peer_net) ? peer_net->lpn_net_id :
LNET_NIDNET(dst_nid);
- lnet_net_unlock(cpt);
- LCONSOLE_WARN("no peer_ni found on peer net %s\n",
+ CDEBUG(D_NET, "no peer_ni found on peer net %s\n",
libcfs_net2str(net_id));
+ return NULL;
+ }
+
+ CDEBUG(D_NET, "sd_best_lpni = %s\n",
+ libcfs_nid2str(best_lpni->lpni_nid));
+
+ return best_lpni;
+}
+
+/*
+ * Prerequisite: the best_ni should already be set in the sd
+ */
+static inline struct lnet_peer_ni *
+lnet_find_best_lpni_on_net(struct lnet_send_data *sd, struct lnet_peer *peer,
+ __u32 net_id)
+{
+ struct lnet_peer_net *peer_net;
+
+ /*
+ * The gateway is Multi-Rail capable so now we must select the
+ * proper peer_ni
+ */
+ peer_net = lnet_peer_get_net_locked(peer, net_id);
+
+ if (!peer_net) {
+ CERROR("gateway peer %s has no NI on net %s\n",
+ libcfs_nid2str(peer->lp_primary_nid),
+ libcfs_net2str(net_id));
+ return NULL;
+ }
+
+ return lnet_select_peer_ni(sd, peer, peer_net);
+}
+
+static inline void
+lnet_set_non_mr_pref_nid(struct lnet_send_data *sd)
+{
+ if (sd->sd_send_case & NMR_DST &&
+ sd->sd_msg->msg_type != LNET_MSG_REPLY &&
+ sd->sd_msg->msg_type != LNET_MSG_ACK &&
+ sd->sd_best_lpni->lpni_pref_nnids == 0) {
+ CDEBUG(D_NET, "Setting preferred local NID %s on NMR peer %s\n",
+ libcfs_nid2str(sd->sd_best_ni->ni_nid),
+ libcfs_nid2str(sd->sd_best_lpni->lpni_nid));
+ lnet_peer_ni_set_non_mr_pref_nid(sd->sd_best_lpni,
+ sd->sd_best_ni->ni_nid);
+ }
+}
+
+/*
+ * Source Specified
+ * Local Destination
+ * non-mr peer
+ *
+ * use the source and destination NIDs as the pathway
+ */
+static int
+lnet_handle_spec_local_nmr_dst(struct lnet_send_data *sd)
+{
+ /* the destination lpni is set before we get here. */
+
+ /* find local NI */
+ sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
+ if (!sd->sd_best_ni) {
+ CERROR("Can't send to %s: src %s is not a "
+ "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
+ libcfs_nid2str(sd->sd_src_nid));
+ return -EINVAL;
+ }
+
+ /*
+ * the preferred NID will only be set for NMR peers
+ */
+ lnet_set_non_mr_pref_nid(sd);
+
+ return lnet_handle_send(sd);
+}
+
+/*
+ * Source Specified
+ * Local Destination
+ * MR Peer
+ *
+ * Run the selection algorithm on the peer NIs unless we're sending
+ * a response, in this case just send to the destination
+ */
+static int
+lnet_handle_spec_local_mr_dst(struct lnet_send_data *sd)
+{
+ sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
+ if (!sd->sd_best_ni) {
+ CERROR("Can't send to %s: src %s is not a "
+ "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
+ libcfs_nid2str(sd->sd_src_nid));
+ return -EINVAL;
+ }
+
+ /*
+ * only run the selection algorithm to pick the peer_ni if we're
+ * sending a GET or a PUT. Responses are sent to the same
+ * destination NID provided.
+ */
+ if (!(sd->sd_send_case & SND_RESP)) {
+ sd->sd_best_lpni =
+ lnet_find_best_lpni_on_net(sd, sd->sd_peer,
+ sd->sd_best_ni->ni_net->net_id);
+ }
+
+ if (sd->sd_best_lpni)
+ return lnet_handle_send(sd);
+
+ CERROR("can't send to %s. no NI on %s\n",
+ libcfs_nid2str(sd->sd_dst_nid),
+ libcfs_net2str(sd->sd_best_ni->ni_net->net_id));
+
+ return -EHOSTUNREACH;
+}
+
+struct lnet_ni *
+lnet_find_best_ni_on_spec_net(struct lnet_ni *cur_best_ni,
+ struct lnet_peer *peer,
+ struct lnet_peer_net *peer_net,
+ int cpt,
+ bool incr_seq)
+{
+ struct lnet_net *local_net;
+ struct lnet_ni *best_ni;
+
+ local_net = lnet_get_net_locked(peer_net->lpn_net_id);
+ if (!local_net)
+ return NULL;
+
+ /*
+ * Iterate through the NIs in this local Net and select
+ * the NI to send from. The selection is determined by
+ * these 3 criterion in the following priority:
+ * 1. NUMA
+ * 2. NI available credits
+ * 3. Round Robin
+ */
+ best_ni = lnet_get_best_ni(local_net, cur_best_ni,
+ peer, peer_net, cpt);
+
+ if (incr_seq && best_ni)
+ best_ni->ni_seq++;
+
+ return best_ni;
+}
+
+static int
+lnet_handle_find_routed_path(struct lnet_send_data *sd,
+ lnet_nid_t dst_nid,
+ struct lnet_peer_ni **gw_lpni,
+ struct lnet_peer **gw_peer)
+{
+ struct lnet_peer_ni *gw;
+ lnet_nid_t src_nid = sd->sd_src_nid;
+
+ gw = lnet_find_route_locked(NULL, LNET_NIDNET(dst_nid),
+ sd->sd_rtr_nid);
+ if (!gw) {
+ CERROR("no route to %s from %s\n",
+ libcfs_nid2str(dst_nid), libcfs_nid2str(src_nid));
return -EHOSTUNREACH;
}
+ /* get the peer of the gw_ni */
+ LASSERT(gw->lpni_peer_net);
+ LASSERT(gw->lpni_peer_net->lpn_peer);
+
+ *gw_peer = gw->lpni_peer_net->lpn_peer;
+
+ if (!sd->sd_best_ni)
+ sd->sd_best_ni = lnet_find_best_ni_on_spec_net(NULL, *gw_peer,
+ gw->lpni_peer_net,
+ sd->sd_md_cpt,
+ true);
+
+ if (!sd->sd_best_ni) {
+ CERROR("Internal Error. Expected local ni on %s "
+ "but non found :%s\n",
+ libcfs_net2str(gw->lpni_peer_net->lpn_net_id),
+ libcfs_nid2str(sd->sd_src_nid));
+ return -EFAULT;
+ }
+
+ /*
+ * if gw is MR let's find its best peer_ni
+ */
+ if (lnet_peer_is_multi_rail(*gw_peer)) {
+ gw = lnet_find_best_lpni_on_net(sd, *gw_peer,
+ sd->sd_best_ni->ni_net->net_id);
+ /*
+ * We've already verified that the gw has an NI on that
+ * desired net, but we're not finding it. Something is
+ * wrong.
+ */
+ if (!gw) {
+ CERROR("Internal Error. Route expected to %s from %s\n",
+ libcfs_nid2str(dst_nid),
+ libcfs_nid2str(src_nid));
+ return -EFAULT;
+ }
+ }
+
+ *gw_lpni = gw;
+
+ return 0;
+}
+
+/*
+ * Handle two cases:
+ *
+ * Case 1:
+ * Source specified
+ * Remote destination
+ * Non-MR destination
+ *
+ * Case 2:
+ * Source specified
+ * Remote destination
+ * MR destination
+ *
+ * The handling of these two cases is similar. Even though the destination
+ * can be MR or non-MR, we'll deal directly with the router.
+ */
+static int
+lnet_handle_spec_router_dst(struct lnet_send_data *sd)
+{
+ int rc;
+ struct lnet_peer_ni *gw_lpni = NULL;
+ struct lnet_peer *gw_peer = NULL;
+
+ /* find local NI */
+ sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
+ if (!sd->sd_best_ni) {
+ CERROR("Can't send to %s: src %s is not a "
+ "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
+ libcfs_nid2str(sd->sd_src_nid));
+ return -EINVAL;
+ }
+
+ rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
+ &gw_peer);
+ if (rc < 0)
+ return rc;
+
+ if (sd->sd_send_case & NMR_DST)
+ /*
+ * since the final destination is non-MR let's set its preferred
+ * NID before we send
+ */
+ lnet_set_non_mr_pref_nid(sd);
+
+ /*
+ * We're going to send to the gw found so let's set its
+ * info
+ */
+ sd->sd_peer = gw_peer;
+ sd->sd_best_lpni = gw_lpni;
+
+ return lnet_handle_send(sd);
+}
+
+struct lnet_ni *
+lnet_find_best_ni_on_local_net(struct lnet_peer *peer, int md_cpt)
+{
+ struct lnet_peer_net *peer_net = NULL;
+ struct lnet_ni *best_ni = NULL;
+
+ /*
+ * The peer can have multiple interfaces, some of them can be on
+ * the local network and others on a routed network. We should
+ * prefer the local network. However if the local network is not
+ * available then we need to try the routed network
+ */
+
+ /* go through all the peer nets and find the best_ni */
+ list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
+ /*
+ * The peer's list of nets can contain non-local nets. We
+ * want to only examine the local ones.
+ */
+ if (!lnet_get_net_locked(peer_net->lpn_net_id))
+ continue;
+ best_ni = lnet_find_best_ni_on_spec_net(best_ni, peer,
+ peer_net, md_cpt, false);
+ }
+
+ if (best_ni)
+ /* increment sequence number so we can round robin */
+ best_ni->ni_seq++;
+
+ return best_ni;
+}
+
+static struct lnet_ni *
+lnet_find_existing_preferred_best_ni(struct lnet_send_data *sd)
+{
+ struct lnet_ni *best_ni = NULL;
+ struct lnet_peer_net *peer_net;
+ struct lnet_peer *peer = sd->sd_peer;
+ struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
+ struct lnet_peer_ni *lpni;
+ int cpt = sd->sd_cpt;
+
+ /*
+ * We must use a consistent source address when sending to a
+ * non-MR peer. However, a non-MR peer can have multiple NIDs
+ * on multiple networks, and we may even need to talk to this
+ * peer on multiple networks -- certain types of
+ * load-balancing configuration do this.
+ *
+ * So we need to pick the NI the peer prefers for this
+ * particular network.
+ */
+
+ /* Get the target peer_ni */
+ peer_net = lnet_peer_get_net_locked(peer,
+ LNET_NIDNET(best_lpni->lpni_nid));
+ LASSERT(peer_net != NULL);
+ list_for_each_entry(lpni, &peer_net->lpn_peer_nis,
+ lpni_peer_nis) {
+ if (lpni->lpni_pref_nnids == 0)
+ continue;
+ LASSERT(lpni->lpni_pref_nnids == 1);
+ best_ni = lnet_nid2ni_locked(
+ lpni->lpni_pref.nid, cpt);
+ break;
+ }
+
+ return best_ni;
+}
+
+/* Prerequisite: sd->sd_peer and sd->sd_best_lpni should be set */
+static int
+lnet_select_preferred_best_ni(struct lnet_send_data *sd)
+{
+ struct lnet_ni *best_ni = NULL;
+ struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
+
+ /*
+ * We must use a consistent source address when sending to a
+ * non-MR peer. However, a non-MR peer can have multiple NIDs
+ * on multiple networks, and we may even need to talk to this
+ * peer on multiple networks -- certain types of
+ * load-balancing configuration do this.
+ *
+ * So we need to pick the NI the peer prefers for this
+ * particular network.
+ */
+
+ best_ni = lnet_find_existing_preferred_best_ni(sd);
+
+ /* if best_ni is still not set just pick one */
+ if (!best_ni) {
+ best_ni =
+ lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
+ sd->sd_best_lpni->lpni_peer_net,
+ sd->sd_md_cpt, true);
+ /* If there is no best_ni we don't have a route */
+ if (!best_ni) {
+ CERROR("no path to %s from net %s\n",
+ libcfs_nid2str(best_lpni->lpni_nid),
+ libcfs_net2str(best_lpni->lpni_net->net_id));
+ return -EHOSTUNREACH;
+ }
+ }
+
+ sd->sd_best_ni = best_ni;
+
+ /* Set preferred NI if necessary. */
+ lnet_set_non_mr_pref_nid(sd);
+
+ return 0;
+}
+
+
+/*
+ * Source not specified
+ * Local destination
+ * Non-MR Peer
+ *
+ * always use the same source NID for NMR peers
+ * If we've talked to that peer before then we already have a preferred
+ * source NI associated with it. Otherwise, we select a preferred local NI
+ * and store it in the peer
+ */
+static int
+lnet_handle_any_local_nmr_dst(struct lnet_send_data *sd)
+{
+ int rc;
+
+ /* sd->sd_best_lpni is already set to the final destination */
+
+ /*
+ * At this point we should've created the peer ni and peer. If we
+ * can't find it, then something went wrong. Instead of assert
+ * output a relevant message and fail the send
+ */
+ if (!sd->sd_best_lpni) {
+ CERROR("Internal fault. Unable to send msg %s to %s. "
+ "NID not known\n",
+ lnet_msgtyp2str(sd->sd_msg->msg_type),
+ libcfs_nid2str(sd->sd_dst_nid));
+ return -EFAULT;
+ }
+
+ rc = lnet_select_preferred_best_ni(sd);
+ if (!rc)
+ rc = lnet_handle_send(sd);
+
+ return rc;
+}
+
+static int
+lnet_handle_any_mr_dsta(struct lnet_send_data *sd)
+{
+ /*
+ * NOTE we've already handled the remote peer case. So we only
+ * need to worry about the local case here.
+ *
+ * if we're sending a response, ACK or reply, we need to send it
+ * to the destination NID given to us. At this point we already
+ * have the peer_ni we're suppose to send to, so just find the
+ * best_ni on the peer net and use that. Since we're sending to an
+ * MR peer then we can just run the selection algorithm on our
+ * local NIs and pick the best one.
+ */
+ if (sd->sd_send_case & SND_RESP) {
+ sd->sd_best_ni =
+ lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
+ sd->sd_best_lpni->lpni_peer_net,
+ sd->sd_md_cpt, true);
+
+ if (!sd->sd_best_ni) {
+ /*
+ * We're not going to deal with not able to send
+ * a response to the provided final destination
+ */
+ CERROR("Can't send response to %s. "
+ "No local NI available\n",
+ libcfs_nid2str(sd->sd_dst_nid));
+ return -EHOSTUNREACH;
+ }
+
+ return lnet_handle_send(sd);
+ }
+
+ /*
+ * If we get here that means we're sending a fresh request, PUT or
+ * GET, so we need to run our standard selection algorithm.
+ * First find the best local interface that's on any of the peer's
+ * networks.
+ */
+ sd->sd_best_ni = lnet_find_best_ni_on_local_net(sd->sd_peer,
+ sd->sd_md_cpt);
+ if (sd->sd_best_ni) {
+ sd->sd_best_lpni =
+ lnet_find_best_lpni_on_net(sd, sd->sd_peer,
+ sd->sd_best_ni->ni_net->net_id);
+
+ /*
+ * if we're successful in selecting a peer_ni on the local
+ * network, then send to it. Otherwise fall through and
+ * try and see if we can reach it over another routed
+ * network
+ */
+ if (sd->sd_best_lpni) {
+ /*
+ * in case we initially started with a routed
+ * destination, let's reset to local
+ */
+ sd->sd_send_case &= ~REMOTE_DST;
+ sd->sd_send_case |= LOCAL_DST;
+ return lnet_handle_send(sd);
+ }
+
+ CERROR("Internal Error. Expected to have a best_lpni: "
+ "%s -> %s\n",
+ libcfs_nid2str(sd->sd_src_nid),
+ libcfs_nid2str(sd->sd_dst_nid));
+
+ return -EFAULT;
+ }
+
+ /*
+ * Peer doesn't have a local network. Let's see if there is
+ * a remote network we can reach it on.
+ */
+ return PASS_THROUGH;
+}
+
+/*
+ * Case 1:
+ * Source NID not specified
+ * Local destination
+ * MR peer
+ *
+ * Case 2:
+ * Source NID not speified
+ * Remote destination
+ * MR peer
+ *
+ * In both of these cases if we're sending a response, ACK or REPLY, then
+ * we need to send to the destination NID provided.
+ *
+ * In the remote case let's deal with MR routers.
+ *
+ */
+
+static int
+lnet_handle_any_mr_dst(struct lnet_send_data *sd)
+{
+ int rc = 0;
+ struct lnet_peer *gw_peer = NULL;
+ struct lnet_peer_ni *gw_lpni = NULL;
+
+ /*
+ * handle sending a response to a remote peer here so we don't
+ * have to worry about it if we hit lnet_handle_any_mr_dsta()
+ */
+ if (sd->sd_send_case & REMOTE_DST &&
+ sd->sd_send_case & SND_RESP) {
+ struct lnet_peer_ni *gw;
+ struct lnet_peer *gw_peer;
+
+ rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw,
+ &gw_peer);
+ if (rc < 0) {
+ CERROR("Can't send response to %s. "
+ "No route available\n",
+ libcfs_nid2str(sd->sd_dst_nid));
+ return -EHOSTUNREACH;
+ }
+
+ sd->sd_best_lpni = gw;
+ sd->sd_peer = gw_peer;
+
+ return lnet_handle_send(sd);
+ }
+
+ /*
+ * Even though the NID for the peer might not be on a local network,
+ * since the peer is MR there could be other interfaces on the
+ * local network. In that case we'd still like to prefer the local
+ * network over the routed network. If we're unable to do that
+ * then we select the best router among the different routed networks,
+ * and if the router is MR then we can deal with it as such.
+ */
+ rc = lnet_handle_any_mr_dsta(sd);
+ if (rc != PASS_THROUGH)
+ return rc;
+
+ /*
+ * TODO; One possible enhancement is to run the selection
+ * algorithm on the peer. However for remote peers the credits are
+ * not decremented, so we'll be basically going over the peer NIs
+ * in round robin. An MR router will run the selection algorithm
+ * on the next-hop interfaces.
+ */
+ rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
+ &gw_peer);
+ if (rc < 0)
+ return rc;
+
+ sd->sd_send_case &= ~LOCAL_DST;
+ sd->sd_send_case |= REMOTE_DST;
+
+ sd->sd_peer = gw_peer;
+ sd->sd_best_lpni = gw_lpni;
+
+ return lnet_handle_send(sd);
+}
+
+/*
+ * Source not specified
+ * Remote destination
+ * Non-MR peer
+ *
+ * Must send to the specified peer NID using the same source NID that
+ * we've used before. If it's the first time to talk to that peer then
+ * find the source NI and assign it as preferred to that peer
+ */
+static int
+lnet_handle_any_router_nmr_dst(struct lnet_send_data *sd)
+{
+ int rc;
+ struct lnet_peer_ni *gw_lpni = NULL;
+ struct lnet_peer *gw_peer = NULL;
+
+ /*
+ * Let's set if we have a preferred NI to talk to this NMR peer
+ */
+ sd->sd_best_ni = lnet_find_existing_preferred_best_ni(sd);
+
+ /*
+ * find the router and that'll find the best NI if we didn't find
+ * it already.
+ */
+ rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
+ &gw_peer);
+ if (rc < 0)
+ return rc;
+
+ /*
+ * set the best_ni we've chosen as the preferred one for
+ * this peer
+ */
+ lnet_set_non_mr_pref_nid(sd);
+
+ /* we'll be sending to the gw */
+ sd->sd_best_lpni = gw_lpni;
+ sd->sd_peer = gw_peer;
+
+ return lnet_handle_send(sd);
+}
+
+static int
+lnet_handle_send_case_locked(struct lnet_send_data *sd)
+{
+ /*
+ * turn off the SND_RESP bit.
+ * It will be checked in the case handling
+ */
+ __u32 send_case = sd->sd_send_case &= ~SND_RESP ;
+
+ CDEBUG(D_NET, "Source %s%s to %s %s %s destination\n",
+ (send_case & SRC_SPEC) ? "Specified: " : "ANY",
+ (send_case & SRC_SPEC) ? libcfs_nid2str(sd->sd_src_nid) : "",
+ (send_case & MR_DST) ? "MR: " : "NMR: ",
+ libcfs_nid2str(sd->sd_dst_nid),
+ (send_case & LOCAL_DST) ? "local" : "routed");
+
+ switch (send_case) {
+ /*
+ * For all cases where the source is specified, we should always
+ * use the destination NID, whether it's an MR destination or not,
+ * since we're continuing a series of related messages for the
+ * same RPC
+ */
+ case SRC_SPEC_LOCAL_NMR_DST:
+ return lnet_handle_spec_local_nmr_dst(sd);
+ case SRC_SPEC_LOCAL_MR_DST:
+ return lnet_handle_spec_local_mr_dst(sd);
+ case SRC_SPEC_ROUTER_NMR_DST:
+ case SRC_SPEC_ROUTER_MR_DST:
+ return lnet_handle_spec_router_dst(sd);
+ case SRC_ANY_LOCAL_NMR_DST:
+ return lnet_handle_any_local_nmr_dst(sd);
+ case SRC_ANY_LOCAL_MR_DST:
+ case SRC_ANY_ROUTER_MR_DST:
+ return lnet_handle_any_mr_dst(sd);
+ case SRC_ANY_ROUTER_NMR_DST:
+ return lnet_handle_any_router_nmr_dst(sd);
+ default:
+ CERROR("Unknown send case\n");
+ return -1;
+ }
+}
+
+static int
+lnet_select_pathway(lnet_nid_t src_nid, lnet_nid_t dst_nid,
+ struct lnet_msg *msg, lnet_nid_t rtr_nid)
+{
+ struct lnet_peer_ni *lpni;
+ struct lnet_peer *peer;
+ struct lnet_send_data send_data;
+ int cpt, rc;
+ int md_cpt;
+ __u32 send_case = 0;
+
+ memset(&send_data, 0, sizeof(send_data));
+
+ /*
+ * get an initial CPT to use for locking. The idea here is not to
+ * serialize the calls to select_pathway, so that as many
+ * operations can run concurrently as possible. To do that we use
+ * the CPT where this call is being executed. Later on when we
+ * determine the CPT to use in lnet_message_commit, we switch the
+ * lock and check if there was any configuration change. If none,
+ * then we proceed, if there is, then we restart the operation.
+ */
+ cpt = lnet_net_lock_current();
+
+ md_cpt = lnet_cpt_of_md(msg->msg_md, msg->msg_offset);
+ if (md_cpt == CFS_CPT_ANY)
+ md_cpt = cpt;
+
+again:
+
+ /*
+ * If we're being asked to send to the loopback interface, there
+ * is no need to go through any selection. We can just shortcut
+ * the entire process and send over lolnd
+ */
+ if (LNET_NETTYP(LNET_NIDNET(dst_nid)) == LOLND) {
+ /* No send credit hassles with LOLND */
+ lnet_ni_addref_locked(the_lnet.ln_loni, cpt);
+ msg->msg_hdr.dest_nid = cpu_to_le64(the_lnet.ln_loni->ni_nid);
+ if (!msg->msg_routing)
+ msg->msg_hdr.src_nid =
+ cpu_to_le64(the_lnet.ln_loni->ni_nid);
+ msg->msg_target.nid = the_lnet.ln_loni->ni_nid;
+ lnet_msg_commit(msg, cpt);
+ msg->msg_txni = the_lnet.ln_loni;
+ lnet_net_unlock(cpt);
+
+ return LNET_CREDIT_OK;
+ }
+
+ /*
+ * find an existing peer_ni, or create one and mark it as having been
+ * created due to network traffic. This call will create the
+ * peer->peer_net->peer_ni tree.
+ */
+ lpni = lnet_nid2peerni_locked(dst_nid, LNET_NID_ANY, cpt);
+ if (IS_ERR(lpni)) {
+ lnet_net_unlock(cpt);
+ return PTR_ERR(lpni);
+ }
+
+ /*
+ * Cache the original src_nid. If we need to resend the message
+ * then we'll need to know whether the src_nid was originally
+ * specified for this message. If it was originally specified,
+ * then we need to keep using the same src_nid since it's
+ * continuing the same sequence of messages.
+ */
+ msg->msg_src_nid_param = src_nid;
+
+ /*
+ * Now that we have a peer_ni, check if we want to discover
+ * the peer. Traffic to the LNET_RESERVED_PORTAL should not
+ * trigger discovery.
+ */
+ peer = lpni->lpni_peer_net->lpn_peer;
+ if (lnet_msg_discovery(msg) && !lnet_peer_is_uptodate(peer)) {
+ lnet_nid_t primary_nid;
+ rc = lnet_discover_peer_locked(lpni, cpt, false);
+ if (rc) {
+ lnet_peer_ni_decref_locked(lpni);
+ lnet_net_unlock(cpt);
+ return rc;
+ }
+ /* The peer may have changed. */
+ peer = lpni->lpni_peer_net->lpn_peer;
+ /* queue message and return */
+ msg->msg_rtr_nid_param = rtr_nid;
+ msg->msg_sending = 0;
+ list_add_tail(&msg->msg_list, &peer->lp_dc_pendq);
+ lnet_peer_ni_decref_locked(lpni);
+ primary_nid = peer->lp_primary_nid;
+ lnet_net_unlock(cpt);
+
+ CDEBUG(D_NET, "%s pending discovery\n",
+ libcfs_nid2str(primary_nid));
+
+ return LNET_DC_WAIT;
+ }
+ lnet_peer_ni_decref_locked(lpni);
+
+ /*
+ * Identify the different send cases
+ */
+ if (src_nid == LNET_NID_ANY)
+ send_case |= SRC_ANY;
+ else
+ send_case |= SRC_SPEC;
+
+ if (lnet_get_net_locked(LNET_NIDNET(dst_nid)))
+ send_case |= LOCAL_DST;
+ else
+ send_case |= REMOTE_DST;
+
+ /*
+ * if this is a non-MR peer or if we're recovering a peer ni then
+ * let's consider this an NMR case so we can hit the destination
+ * NID.
+ */
+ if (!lnet_peer_is_multi_rail(peer) || msg->msg_recovery)
+ send_case |= NMR_DST;
+ else
+ send_case |= MR_DST;
+
+ if (msg->msg_type == LNET_MSG_REPLY ||
+ msg->msg_type == LNET_MSG_ACK)
+ send_case |= SND_RESP;
+
+ /* assign parameters to the send_data */
+ send_data.sd_msg = msg;
+ send_data.sd_rtr_nid = rtr_nid;
+ send_data.sd_src_nid = src_nid;
+ send_data.sd_dst_nid = dst_nid;
+ send_data.sd_best_lpni = lpni;
+ /*
+ * keep a pointer to the final destination in case we're going to
+ * route, so we'll need to access it later
+ */
+ send_data.sd_final_dst_lpni = lpni;
+ send_data.sd_peer = peer;
+ send_data.sd_md_cpt = md_cpt;
+ send_data.sd_cpt = cpt;
+ send_data.sd_send_case = send_case;
+
+ rc = lnet_handle_send_case_locked(&send_data);
+
+ if (rc == REPEAT_SEND)
+ goto again;
+
+ lnet_net_unlock(send_data.sd_cpt);
+
+ return rc;
+}
+
+int
+lnet_send(lnet_nid_t src_nid, struct lnet_msg *msg, lnet_nid_t rtr_nid)
+{
+ lnet_nid_t dst_nid = msg->msg_target.nid;
+ int rc;
+
+ /*
+ * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
+ * but we might want to use pre-determined router for ACK/REPLY
+ * in the future
+ */
+ /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
+ LASSERT(msg->msg_txpeer == NULL);
+ LASSERT(msg->msg_txni == NULL);
+ LASSERT(!msg->msg_sending);
+ LASSERT(!msg->msg_target_is_router);
+ LASSERT(!msg->msg_receiving);
+
+ msg->msg_sending = 1;
+
+ LASSERT(!msg->msg_tx_committed);
+
+ rc = lnet_select_pathway(src_nid, dst_nid, msg, rtr_nid);
+ if (rc < 0)
+ return rc;
+
+ if (rc == LNET_CREDIT_OK)
+ lnet_ni_send(msg->msg_txni, msg);
+
+ /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT or LNET_DC_WAIT */
+ return 0;
+}
+
+enum lnet_mt_event_type {
+ MT_TYPE_LOCAL_NI = 0,
+ MT_TYPE_PEER_NI
+};
+
+struct lnet_mt_event_info {
+ enum lnet_mt_event_type mt_type;
+ lnet_nid_t mt_nid;
+};
+
+void
+lnet_detach_rsp_tracker(struct lnet_libmd *md, int cpt)
+{
+ struct lnet_rsp_tracker *rspt;
+
+ /*
+ * msg has a refcount on the MD so the MD is not going away.
+ * The rspt queue for the cpt is protected by
+ * the lnet_net_lock(cpt). cpt is the cpt of the MD cookie.
+ */
+ lnet_res_lock(cpt);
+ if (!md->md_rspt_ptr) {
+ lnet_res_unlock(cpt);
+ return;
+ }
+ rspt = md->md_rspt_ptr;
+ md->md_rspt_ptr = NULL;
+
+ /* debug code */
+ LASSERT(rspt->rspt_cpt == cpt);
+
+ /*
+ * invalidate the handle to indicate that a response has been
+ * received, which will then lead the monitor thread to clean up
+ * the rspt block.
+ */
+ LNetInvalidateMDHandle(&rspt->rspt_mdh);
+ lnet_res_unlock(cpt);
+}
+
+static void
+lnet_finalize_expired_responses(bool force)
+{
+ struct lnet_libmd *md;
+ struct list_head local_queue;
+ struct lnet_rsp_tracker *rspt, *tmp;
+ int i;
+
+ if (the_lnet.ln_mt_rstq == NULL)
+ return;
+
+ cfs_cpt_for_each(i, lnet_cpt_table()) {
+ INIT_LIST_HEAD(&local_queue);
+
+ lnet_net_lock(i);
+ if (!the_lnet.ln_mt_rstq[i]) {
+ lnet_net_unlock(i);
+ continue;
+ }
+ list_splice_init(the_lnet.ln_mt_rstq[i], &local_queue);
+ lnet_net_unlock(i);
+
+ list_for_each_entry_safe(rspt, tmp, &local_queue, rspt_on_list) {
+ /*
+ * The rspt mdh will be invalidated when a response
+ * is received or whenever we want to discard the
+ * block the monitor thread will walk the queue
+ * and clean up any rsts with an invalid mdh.
+ * The monitor thread will walk the queue until
+ * the first unexpired rspt block. This means that
+ * some rspt blocks which received their
+ * corresponding responses will linger in the
+ * queue until they are cleaned up eventually.
+ */
+ lnet_res_lock(i);
+ if (LNetMDHandleIsInvalid(rspt->rspt_mdh)) {
+ lnet_res_unlock(i);
+ list_del_init(&rspt->rspt_on_list);
+ lnet_rspt_free(rspt, i);
+ continue;
+ }
+
+ if (ktime_compare(ktime_get(), rspt->rspt_deadline) >= 0 ||
+ force) {
+ struct lnet_peer_ni *lpni;
+ lnet_nid_t nid;
+
+ md = lnet_handle2md(&rspt->rspt_mdh);
+ if (!md) {
+ LNetInvalidateMDHandle(&rspt->rspt_mdh);
+ lnet_res_unlock(i);
+ list_del_init(&rspt->rspt_on_list);
+ lnet_rspt_free(rspt, i);
+ continue;
+ }
+ LASSERT(md->md_rspt_ptr == rspt);
+ md->md_rspt_ptr = NULL;
+ lnet_res_unlock(i);
+
+ lnet_net_lock(i);
+ the_lnet.ln_counters[i]->lct_health.lch_response_timeout_count++;
+ lnet_net_unlock(i);
+
+ list_del_init(&rspt->rspt_on_list);
+
+ nid = rspt->rspt_next_hop_nid;
+
+ CNETERR("Response timed out: md = %p: nid = %s\n",
+ md, libcfs_nid2str(nid));
+ LNetMDUnlink(rspt->rspt_mdh);
+ lnet_rspt_free(rspt, i);
+
+ /*
+ * If there is a timeout on the response
+ * from the next hop decrement its health
+ * value so that we don't use it
+ */
+ lnet_net_lock(0);
+ lpni = lnet_find_peer_ni_locked(nid);
+ if (lpni) {
+ lnet_handle_remote_failure_locked(lpni);
+ lnet_peer_ni_decref_locked(lpni);
+ }
+ lnet_net_unlock(0);
+ } else {
+ lnet_res_unlock(i);
+ break;
+ }
+ }
+
+ lnet_net_lock(i);
+ if (!list_empty(&local_queue))
+ list_splice(&local_queue, the_lnet.ln_mt_rstq[i]);
+ lnet_net_unlock(i);
+ }
+}
+
+static void
+lnet_resend_pending_msgs_locked(struct list_head *resendq, int cpt)
+{
+ struct lnet_msg *msg;
+
+ while (!list_empty(resendq)) {
+ struct lnet_peer_ni *lpni;
+
+ msg = list_entry(resendq->next, struct lnet_msg,
+ msg_list);
+
+ list_del_init(&msg->msg_list);
+
+ lpni = lnet_find_peer_ni_locked(msg->msg_hdr.dest_nid);
+ if (!lpni) {
+ lnet_net_unlock(cpt);
+ CERROR("Expected that a peer is already created for %s\n",
+ libcfs_nid2str(msg->msg_hdr.dest_nid));
+ msg->msg_no_resend = true;
+ lnet_finalize(msg, -EFAULT);
+ lnet_net_lock(cpt);
+ } else {
+ struct lnet_peer *peer;
+ int rc;
+ lnet_nid_t src_nid = LNET_NID_ANY;
+
+ /*
+ * if this message is not being routed and the
+ * peer is non-MR then we must use the same
+ * src_nid that was used in the original send.
+ * Otherwise if we're routing the message (IE
+ * we're a router) then we can use any of our
+ * local interfaces. It doesn't matter to the
+ * final destination.
+ */
+ peer = lpni->lpni_peer_net->lpn_peer;
+ if (!msg->msg_routing &&
+ !lnet_peer_is_multi_rail(peer))
+ src_nid = le64_to_cpu(msg->msg_hdr.src_nid);
+
+ /*
+ * If we originally specified a src NID, then we
+ * must attempt to reuse it in the resend as well.
+ */
+ if (msg->msg_src_nid_param != LNET_NID_ANY)
+ src_nid = msg->msg_src_nid_param;
+ lnet_peer_ni_decref_locked(lpni);
+
+ lnet_net_unlock(cpt);
+ CDEBUG(D_NET, "resending %s->%s: %s recovery %d try# %d\n",
+ libcfs_nid2str(src_nid),
+ libcfs_id2str(msg->msg_target),
+ lnet_msgtyp2str(msg->msg_type),
+ msg->msg_recovery,
+ msg->msg_retry_count);
+ rc = lnet_send(src_nid, msg, LNET_NID_ANY);
+ if (rc) {
+ CERROR("Error sending %s to %s: %d\n",
+ lnet_msgtyp2str(msg->msg_type),
+ libcfs_id2str(msg->msg_target), rc);
+ msg->msg_no_resend = true;
+ lnet_finalize(msg, rc);
+ }
+ lnet_net_lock(cpt);
+ if (!rc)
+ the_lnet.ln_counters[cpt]->lct_health.lch_resend_count++;
+ }
+ }
+}
+
+static void
+lnet_resend_pending_msgs(void)
+{
+ int i;
+
+ cfs_cpt_for_each(i, lnet_cpt_table()) {
+ lnet_net_lock(i);
+ lnet_resend_pending_msgs_locked(the_lnet.ln_mt_resendqs[i], i);
+ lnet_net_unlock(i);
+ }
+}
+
+/* called with cpt and ni_lock held */
+static void
+lnet_unlink_ni_recovery_mdh_locked(struct lnet_ni *ni, int cpt, bool force)
+{
+ struct lnet_handle_md recovery_mdh;
+
+ LNetInvalidateMDHandle(&recovery_mdh);
+
+ if (ni->ni_recovery_state & LNET_NI_RECOVERY_PENDING ||
+ force) {
+ recovery_mdh = ni->ni_ping_mdh;
+ LNetInvalidateMDHandle(&ni->ni_ping_mdh);
+ }
+ lnet_ni_unlock(ni);
+ lnet_net_unlock(cpt);
+ if (!LNetMDHandleIsInvalid(recovery_mdh))
+ LNetMDUnlink(recovery_mdh);
+ lnet_net_lock(cpt);
+ lnet_ni_lock(ni);
+}
+
+static void
+lnet_recover_local_nis(void)
+{
+ struct lnet_mt_event_info *ev_info;
+ struct list_head processed_list;
+ struct list_head local_queue;
+ struct lnet_handle_md mdh;
+ struct lnet_ni *tmp;
+ struct lnet_ni *ni;
+ lnet_nid_t nid;
+ int healthv;
+ int rc;
+
+ INIT_LIST_HEAD(&local_queue);
+ INIT_LIST_HEAD(&processed_list);
+
+ /*
+ * splice the recovery queue on a local queue. We will iterate
+ * through the local queue and update it as needed. Once we're
+ * done with the traversal, we'll splice the local queue back on
+ * the head of the ln_mt_localNIRecovq. Any newly added local NIs
+ * will be traversed in the next iteration.
+ */
+ lnet_net_lock(0);
+ list_splice_init(&the_lnet.ln_mt_localNIRecovq,
+ &local_queue);
+ lnet_net_unlock(0);
+
+ list_for_each_entry_safe(ni, tmp, &local_queue, ni_recovery) {
+ /*
+ * if an NI is being deleted or it is now healthy, there
+ * is no need to keep it around in the recovery queue.
+ * The monitor thread is the only thread responsible for
+ * removing the NI from the recovery queue.
+ * Multiple threads can be adding NIs to the recovery
+ * queue.
+ */
+ healthv = atomic_read(&ni->ni_healthv);
+
+ lnet_net_lock(0);
+ lnet_ni_lock(ni);
+ if (ni->ni_state != LNET_NI_STATE_ACTIVE ||
+ healthv == LNET_MAX_HEALTH_VALUE) {
+ list_del_init(&ni->ni_recovery);
+ lnet_unlink_ni_recovery_mdh_locked(ni, 0, false);
+ lnet_ni_unlock(ni);
+ lnet_ni_decref_locked(ni, 0);
+ lnet_net_unlock(0);
+ continue;
+ }
+
+ /*
+ * if the local NI failed recovery we must unlink the md.
+ * But we want to keep the local_ni on the recovery queue
+ * so we can continue the attempts to recover it.
+ */
+ if (ni->ni_recovery_state & LNET_NI_RECOVERY_FAILED) {
+ lnet_unlink_ni_recovery_mdh_locked(ni, 0, true);
+ ni->ni_recovery_state &= ~LNET_NI_RECOVERY_FAILED;
+ }
+
+ lnet_ni_unlock(ni);
+ lnet_net_unlock(0);
+
+
+ CDEBUG(D_NET, "attempting to recover local ni: %s\n",
+ libcfs_nid2str(ni->ni_nid));
+
+ lnet_ni_lock(ni);
+ if (!(ni->ni_recovery_state & LNET_NI_RECOVERY_PENDING)) {
+ ni->ni_recovery_state |= LNET_NI_RECOVERY_PENDING;
+ lnet_ni_unlock(ni);
+
+ LIBCFS_ALLOC(ev_info, sizeof(*ev_info));
+ if (!ev_info) {
+ CERROR("out of memory. Can't recover %s\n",
+ libcfs_nid2str(ni->ni_nid));
+ lnet_ni_lock(ni);
+ ni->ni_recovery_state &=
+ ~LNET_NI_RECOVERY_PENDING;
+ lnet_ni_unlock(ni);
+ continue;
+ }
+
+ mdh = ni->ni_ping_mdh;
+ /*
+ * Invalidate the ni mdh in case it's deleted.
+ * We'll unlink the mdh in this case below.
+ */
+ LNetInvalidateMDHandle(&ni->ni_ping_mdh);
+ nid = ni->ni_nid;
+
+ /*
+ * remove the NI from the local queue and drop the
+ * reference count to it while we're recovering
+ * it. The reason for that, is that the NI could
+ * be deleted, and the way the code is structured
+ * is if we don't drop the NI, then the deletion
+ * code will enter a loop waiting for the
+ * reference count to be removed while holding the
+ * ln_mutex_lock(). When we look up the peer to
+ * send to in lnet_select_pathway() we will try to
+ * lock the ln_mutex_lock() as well, leading to
+ * a deadlock. By dropping the refcount and
+ * removing it from the list, we allow for the NI
+ * to be removed, then we use the cached NID to
+ * look it up again. If it's gone, then we just
+ * continue examining the rest of the queue.
+ */
+ lnet_net_lock(0);
+ list_del_init(&ni->ni_recovery);
+ lnet_ni_decref_locked(ni, 0);
+ lnet_net_unlock(0);
+
+ ev_info->mt_type = MT_TYPE_LOCAL_NI;
+ ev_info->mt_nid = nid;
+ rc = lnet_send_ping(nid, &mdh, LNET_INTERFACES_MIN,
+ ev_info, the_lnet.ln_mt_eqh, true);
+ /* lookup the nid again */
+ lnet_net_lock(0);
+ ni = lnet_nid2ni_locked(nid, 0);
+ if (!ni) {
+ /*
+ * the NI has been deleted when we dropped
+ * the ref count
+ */
+ lnet_net_unlock(0);
+ LNetMDUnlink(mdh);
+ continue;
+ }
+ /*
+ * Same note as in lnet_recover_peer_nis(). When
+ * we're sending the ping, the NI is free to be
+ * deleted or manipulated. By this point it
+ * could've been added back on the recovery queue,
+ * and a refcount taken on it.
+ * So we can't just add it blindly again or we'll
+ * corrupt the queue. We must check under lock if
+ * it's not on any list and if not then add it
+ * to the processed list, which will eventually be
+ * spliced back on to the recovery queue.
+ */
+ ni->ni_ping_mdh = mdh;
+ if (list_empty(&ni->ni_recovery)) {
+ list_add_tail(&ni->ni_recovery, &processed_list);
+ lnet_ni_addref_locked(ni, 0);
+ }
+ lnet_net_unlock(0);
+
+ lnet_ni_lock(ni);
+ if (rc)
+ ni->ni_recovery_state &= ~LNET_NI_RECOVERY_PENDING;
+ }
+ lnet_ni_unlock(ni);
+ }
+
+ /*
+ * put back the remaining NIs on the ln_mt_localNIRecovq to be
+ * reexamined in the next iteration.
+ */
+ list_splice_init(&processed_list, &local_queue);
+ lnet_net_lock(0);
+ list_splice(&local_queue, &the_lnet.ln_mt_localNIRecovq);
+ lnet_net_unlock(0);
+}
+
+static struct list_head **
+lnet_create_array_of_queues(void)
+{
+ struct list_head **qs;
+ struct list_head *q;
+ int i;
+
+ qs = cfs_percpt_alloc(lnet_cpt_table(),
+ sizeof(struct list_head));
+ if (!qs) {
+ CERROR("Failed to allocate queues\n");
+ return NULL;
+ }
+
+ cfs_percpt_for_each(q, i, qs)
+ INIT_LIST_HEAD(q);
+
+ return qs;
+}
+
+static int
+lnet_resendqs_create(void)
+{
+ struct list_head **resendqs;
+ resendqs = lnet_create_array_of_queues();
+
+ if (!resendqs)
+ return -ENOMEM;
+
+ lnet_net_lock(LNET_LOCK_EX);
+ the_lnet.ln_mt_resendqs = resendqs;
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ return 0;
+}
+
+static void
+lnet_clean_local_ni_recoveryq(void)
+{
+ struct lnet_ni *ni;
+
+ /* This is only called when the monitor thread has stopped */
+ lnet_net_lock(0);
+
+ while (!list_empty(&the_lnet.ln_mt_localNIRecovq)) {
+ ni = list_entry(the_lnet.ln_mt_localNIRecovq.next,
+ struct lnet_ni, ni_recovery);
+ list_del_init(&ni->ni_recovery);
+ lnet_ni_lock(ni);
+ lnet_unlink_ni_recovery_mdh_locked(ni, 0, true);
+ lnet_ni_unlock(ni);
+ lnet_ni_decref_locked(ni, 0);
+ }
+
+ lnet_net_unlock(0);
+}
+
+static void
+lnet_unlink_lpni_recovery_mdh_locked(struct lnet_peer_ni *lpni, int cpt,
+ bool force)
+{
+ struct lnet_handle_md recovery_mdh;
+
+ LNetInvalidateMDHandle(&recovery_mdh);
+
+ if (lpni->lpni_state & LNET_PEER_NI_RECOVERY_PENDING || force) {
+ recovery_mdh = lpni->lpni_recovery_ping_mdh;
+ LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
+ }
+ spin_unlock(&lpni->lpni_lock);
+ lnet_net_unlock(cpt);
+ if (!LNetMDHandleIsInvalid(recovery_mdh))
+ LNetMDUnlink(recovery_mdh);
+ lnet_net_lock(cpt);
+ spin_lock(&lpni->lpni_lock);
+}
+
+static void
+lnet_clean_peer_ni_recoveryq(void)
+{
+ struct lnet_peer_ni *lpni, *tmp;
+
+ lnet_net_lock(LNET_LOCK_EX);
+
+ list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_mt_peerNIRecovq,
+ lpni_recovery) {
+ list_del_init(&lpni->lpni_recovery);
+ spin_lock(&lpni->lpni_lock);
+ lnet_unlink_lpni_recovery_mdh_locked(lpni, LNET_LOCK_EX, true);
+ spin_unlock(&lpni->lpni_lock);
+ lnet_peer_ni_decref_locked(lpni);
+ }
+
+ lnet_net_unlock(LNET_LOCK_EX);
+}
+
+static void
+lnet_clean_resendqs(void)
+{
+ struct lnet_msg *msg, *tmp;
+ struct list_head msgs;
+ int i;
+
+ INIT_LIST_HEAD(&msgs);
+
+ cfs_cpt_for_each(i, lnet_cpt_table()) {
+ lnet_net_lock(i);
+ list_splice_init(the_lnet.ln_mt_resendqs[i], &msgs);
+ lnet_net_unlock(i);
+ list_for_each_entry_safe(msg, tmp, &msgs, msg_list) {
+ list_del_init(&msg->msg_list);
+ msg->msg_no_resend = true;
+ lnet_finalize(msg, -ESHUTDOWN);
+ }
+ }
+
+ cfs_percpt_free(the_lnet.ln_mt_resendqs);
+}
-send:
- routing = routing || routing2;
+static void
+lnet_recover_peer_nis(void)
+{
+ struct lnet_mt_event_info *ev_info;
+ struct list_head processed_list;
+ struct list_head local_queue;
+ struct lnet_handle_md mdh;
+ struct lnet_peer_ni *lpni;
+ struct lnet_peer_ni *tmp;
+ lnet_nid_t nid;
+ int healthv;
+ int rc;
- /*
- * Increment sequence number of the peer selected so that we
- * pick the next one in Round Robin.
- */
- best_lpni->lpni_seq++;
+ INIT_LIST_HEAD(&local_queue);
+ INIT_LIST_HEAD(&processed_list);
/*
- * grab a reference on the peer_ni so it sticks around even if
- * we need to drop and relock the lnet_net_lock below.
+ * Always use cpt 0 for locking across all interactions with
+ * ln_mt_peerNIRecovq
*/
- lnet_peer_ni_addref_locked(best_lpni);
+ lnet_net_lock(0);
+ list_splice_init(&the_lnet.ln_mt_peerNIRecovq,
+ &local_queue);
+ lnet_net_unlock(0);
- /*
- * Use lnet_cpt_of_nid() to determine the CPT used to commit the
- * message. This ensures that we get a CPT that is correct for
- * the NI when the NI has been restricted to a subset of all CPTs.
- * If the selected CPT differs from the one currently locked, we
- * must unlock and relock the lnet_net_lock(), and then check whether
- * the configuration has changed. We don't have a hold on the best_ni
- * yet, and it may have vanished.
- */
- cpt2 = lnet_cpt_of_nid_locked(best_lpni->lpni_nid, best_ni);
- if (cpt != cpt2) {
- lnet_net_unlock(cpt);
- cpt = cpt2;
- lnet_net_lock(cpt);
- if (seq != lnet_get_dlc_seq_locked()) {
- lnet_peer_ni_decref_locked(best_lpni);
- goto again;
+ list_for_each_entry_safe(lpni, tmp, &local_queue,
+ lpni_recovery) {
+ /*
+ * The same protection strategy is used here as is in the
+ * local recovery case.
+ */
+ lnet_net_lock(0);
+ healthv = atomic_read(&lpni->lpni_healthv);
+ spin_lock(&lpni->lpni_lock);
+ if (lpni->lpni_state & LNET_PEER_NI_DELETING ||
+ healthv == LNET_MAX_HEALTH_VALUE) {
+ list_del_init(&lpni->lpni_recovery);
+ lnet_unlink_lpni_recovery_mdh_locked(lpni, 0, false);
+ spin_unlock(&lpni->lpni_lock);
+ lnet_peer_ni_decref_locked(lpni);
+ lnet_net_unlock(0);
+ continue;
+ }
+
+ /*
+ * If the peer NI has failed recovery we must unlink the
+ * md. But we want to keep the peer ni on the recovery
+ * queue so we can try to continue recovering it
+ */
+ if (lpni->lpni_state & LNET_PEER_NI_RECOVERY_FAILED) {
+ lnet_unlink_lpni_recovery_mdh_locked(lpni, 0, true);
+ lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_FAILED;
+ }
+
+ spin_unlock(&lpni->lpni_lock);
+ lnet_net_unlock(0);
+
+ /*
+ * NOTE: we're racing with peer deletion from user space.
+ * It's possible that a peer is deleted after we check its
+ * state. In this case the recovery can create a new peer
+ */
+ spin_lock(&lpni->lpni_lock);
+ if (!(lpni->lpni_state & LNET_PEER_NI_RECOVERY_PENDING) &&
+ !(lpni->lpni_state & LNET_PEER_NI_DELETING)) {
+ lpni->lpni_state |= LNET_PEER_NI_RECOVERY_PENDING;
+ spin_unlock(&lpni->lpni_lock);
+
+ LIBCFS_ALLOC(ev_info, sizeof(*ev_info));
+ if (!ev_info) {
+ CERROR("out of memory. Can't recover %s\n",
+ libcfs_nid2str(lpni->lpni_nid));
+ spin_lock(&lpni->lpni_lock);
+ lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
+ spin_unlock(&lpni->lpni_lock);
+ continue;
+ }
+
+ /* look at the comments in lnet_recover_local_nis() */
+ mdh = lpni->lpni_recovery_ping_mdh;
+ LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
+ nid = lpni->lpni_nid;
+ lnet_net_lock(0);
+ list_del_init(&lpni->lpni_recovery);
+ lnet_peer_ni_decref_locked(lpni);
+ lnet_net_unlock(0);
+
+ ev_info->mt_type = MT_TYPE_PEER_NI;
+ ev_info->mt_nid = nid;
+ rc = lnet_send_ping(nid, &mdh, LNET_INTERFACES_MIN,
+ ev_info, the_lnet.ln_mt_eqh, true);
+ lnet_net_lock(0);
+ /*
+ * lnet_find_peer_ni_locked() grabs a refcount for
+ * us. No need to take it explicitly.
+ */
+ lpni = lnet_find_peer_ni_locked(nid);
+ if (!lpni) {
+ lnet_net_unlock(0);
+ LNetMDUnlink(mdh);
+ continue;
+ }
+
+ lpni->lpni_recovery_ping_mdh = mdh;
+ /*
+ * While we're unlocked the lpni could've been
+ * readded on the recovery queue. In this case we
+ * don't need to add it to the local queue, since
+ * it's already on there and the thread that added
+ * it would've incremented the refcount on the
+ * peer, which means we need to decref the refcount
+ * that was implicitly grabbed by find_peer_ni_locked.
+ * Otherwise, if the lpni is still not on
+ * the recovery queue, then we'll add it to the
+ * processed list.
+ */
+ if (list_empty(&lpni->lpni_recovery))
+ list_add_tail(&lpni->lpni_recovery, &processed_list);
+ else
+ lnet_peer_ni_decref_locked(lpni);
+ lnet_net_unlock(0);
+
+ spin_lock(&lpni->lpni_lock);
+ if (rc)
+ lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
}
+ spin_unlock(&lpni->lpni_lock);
}
- /*
- * store the best_lpni in the message right away to avoid having
- * to do the same operation under different conditions
- */
- msg->msg_txpeer = best_lpni;
- msg->msg_txni = best_ni;
+ list_splice_init(&processed_list, &local_queue);
+ lnet_net_lock(0);
+ list_splice(&local_queue, &the_lnet.ln_mt_peerNIRecovq);
+ lnet_net_unlock(0);
+}
- /*
- * grab a reference for the best_ni since now it's in use in this
- * send. the reference will need to be dropped when the message is
- * finished in lnet_finalize()
- */
- lnet_ni_addref_locked(msg->msg_txni, cpt);
+static int
+lnet_monitor_thread(void *arg)
+{
+ time64_t recovery_timeout = 0;
+ time64_t rsp_timeout = 0;
+ int interval;
+ time64_t now;
/*
- * Always set the target.nid to the best peer picked. Either the
- * nid will be one of the preconfigured NIDs, or the same NID as
- * what was originally set in the target or it will be the NID of
- * a router if this message should be routed
+ * The monitor thread takes care of the following:
+ * 1. Checks the aliveness of routers
+ * 2. Checks if there are messages on the resend queue to resend
+ * them.
+ * 3. Check if there are any NIs on the local recovery queue and
+ * pings them
+ * 4. Checks if there are any NIs on the remote recovery queue
+ * and pings them.
*/
- msg->msg_target.nid = msg->msg_txpeer->lpni_nid;
+ cfs_block_allsigs();
- /*
- * lnet_msg_commit assigns the correct cpt to the message, which
- * is used to decrement the correct refcount on the ni when it's
- * time to return the credits
- */
- lnet_msg_commit(msg, cpt);
+ while (the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING) {
+ now = ktime_get_real_seconds();
- /*
- * If we are routing the message then we don't need to overwrite
- * the src_nid since it would've been set at the origin. Otherwise
- * we are the originator so we need to set it.
- */
- if (!msg->msg_routing)
- msg->msg_hdr.src_nid = cpu_to_le64(msg->msg_txni->ni_nid);
+ if (lnet_router_checker_active())
+ lnet_check_routers();
+
+ lnet_resend_pending_msgs();
+
+ if (now >= rsp_timeout) {
+ lnet_finalize_expired_responses(false);
+ rsp_timeout = now + (lnet_transaction_timeout / 2);
+ }
+
+ if (now >= recovery_timeout) {
+ lnet_recover_local_nis();
+ lnet_recover_peer_nis();
+ recovery_timeout = now + lnet_recovery_interval;
+ }
- if (routing) {
- msg->msg_target_is_router = 1;
- msg->msg_target.pid = LNET_PID_LUSTRE;
/*
- * since we're routing we want to ensure that the
- * msg_hdr.dest_nid is set to the final destination. When
- * the router receives this message it knows how to route
- * it.
+ * TODO do we need to check if we should sleep without
+ * timeout? Technically, an active system will always
+ * have messages in flight so this check will always
+ * evaluate to false. And on an idle system do we care
+ * if we wake up every 1 second? Although, we've seen
+ * cases where we get a complaint that an idle thread
+ * is waking up unnecessarily.
*/
- msg->msg_hdr.dest_nid =
- cpu_to_le64(final_dst ? final_dst->lpni_nid : dst_nid);
- } else {
+ interval = min(lnet_recovery_interval,
+ lnet_transaction_timeout / 2);
+ wait_event_interruptible_timeout(the_lnet.ln_mt_waitq,
+ false,
+ cfs_time_seconds(interval));
+ }
+
+ /* clean up the router checker */
+ lnet_prune_rc_data(1);
+
+ /* Shutting down */
+ the_lnet.ln_mt_state = LNET_MT_STATE_SHUTDOWN;
+
+ /* signal that the monitor thread is exiting */
+ up(&the_lnet.ln_mt_signal);
+
+ return 0;
+}
+
+/*
+ * lnet_send_ping
+ * Sends a ping.
+ * Returns == 0 if success
+ * Returns > 0 if LNetMDBind or prior fails
+ * Returns < 0 if LNetGet fails
+ */
+int
+lnet_send_ping(lnet_nid_t dest_nid,
+ struct lnet_handle_md *mdh, int nnis,
+ void *user_data, struct lnet_handle_eq eqh, bool recovery)
+{
+ struct lnet_md md = { NULL };
+ struct lnet_process_id id;
+ struct lnet_ping_buffer *pbuf;
+ int rc;
+
+ if (dest_nid == LNET_NID_ANY) {
+ rc = -EHOSTUNREACH;
+ goto fail_error;
+ }
+
+ pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
+ if (!pbuf) {
+ rc = ENOMEM;
+ goto fail_error;
+ }
+
+ /* initialize md content */
+ md.start = &pbuf->pb_info;
+ md.length = LNET_PING_INFO_SIZE(nnis);
+ md.threshold = 2; /* GET/REPLY */
+ md.max_size = 0;
+ md.options = LNET_MD_TRUNCATE;
+ md.user_ptr = user_data;
+ md.eq_handle = eqh;
+
+ rc = LNetMDBind(md, LNET_UNLINK, mdh);
+ if (rc) {
+ lnet_ping_buffer_decref(pbuf);
+ CERROR("Can't bind MD: %d\n", rc);
+ rc = -rc; /* change the rc to positive */
+ goto fail_error;
+ }
+ id.pid = LNET_PID_LUSTRE;
+ id.nid = dest_nid;
+
+ rc = LNetGet(LNET_NID_ANY, *mdh, id,
+ LNET_RESERVED_PORTAL,
+ LNET_PROTO_PING_MATCHBITS, 0, recovery);
+
+ if (rc)
+ goto fail_unlink_md;
+
+ return 0;
+
+fail_unlink_md:
+ LNetMDUnlink(*mdh);
+ LNetInvalidateMDHandle(mdh);
+fail_error:
+ return rc;
+}
+
+static void
+lnet_handle_recovery_reply(struct lnet_mt_event_info *ev_info,
+ int status)
+{
+ lnet_nid_t nid = ev_info->mt_nid;
+
+ if (ev_info->mt_type == MT_TYPE_LOCAL_NI) {
+ struct lnet_ni *ni;
+
+ lnet_net_lock(0);
+ ni = lnet_nid2ni_locked(nid, 0);
+ if (!ni) {
+ lnet_net_unlock(0);
+ return;
+ }
+ lnet_ni_lock(ni);
+ ni->ni_recovery_state &= ~LNET_NI_RECOVERY_PENDING;
+ if (status)
+ ni->ni_recovery_state |= LNET_NI_RECOVERY_FAILED;
+ lnet_ni_unlock(ni);
+ lnet_net_unlock(0);
+
+ if (status != 0) {
+ CERROR("local NI (%s) recovery failed with %d\n",
+ libcfs_nid2str(nid), status);
+ return;
+ }
/*
- * if we're not routing set the dest_nid to the best peer
- * ni that we picked earlier in the algorithm.
+ * need to increment healthv for the ni here, because in
+ * the lnet_finalize() path we don't have access to this
+ * NI. And in order to get access to it, we'll need to
+ * carry forward too much information.
+ * In the peer case, it'll naturally be incremented
*/
- msg->msg_hdr.dest_nid = cpu_to_le64(msg->msg_txpeer->lpni_nid);
+ lnet_inc_healthv(&ni->ni_healthv);
+ } else {
+ struct lnet_peer_ni *lpni;
+ int cpt;
+
+ cpt = lnet_net_lock_current();
+ lpni = lnet_find_peer_ni_locked(nid);
+ if (!lpni) {
+ lnet_net_unlock(cpt);
+ return;
+ }
+ spin_lock(&lpni->lpni_lock);
+ lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
+ if (status)
+ lpni->lpni_state |= LNET_PEER_NI_RECOVERY_FAILED;
+ spin_unlock(&lpni->lpni_lock);
+ lnet_peer_ni_decref_locked(lpni);
+ lnet_net_unlock(cpt);
+
+ if (status != 0)
+ CERROR("peer NI (%s) recovery failed with %d\n",
+ libcfs_nid2str(nid), status);
}
+}
- rc = lnet_post_send_locked(msg, 0);
+static void
+lnet_mt_event_handler(struct lnet_event *event)
+{
+ struct lnet_mt_event_info *ev_info = event->md.user_ptr;
+ struct lnet_ping_buffer *pbuf;
+
+ /* TODO: remove assert */
+ LASSERT(event->type == LNET_EVENT_REPLY ||
+ event->type == LNET_EVENT_SEND ||
+ event->type == LNET_EVENT_UNLINK);
+
+ CDEBUG(D_NET, "Received event: %d status: %d\n", event->type,
+ event->status);
+
+ switch (event->type) {
+ case LNET_EVENT_UNLINK:
+ CDEBUG(D_NET, "%s recovery ping unlinked\n",
+ libcfs_nid2str(ev_info->mt_nid));
+ case LNET_EVENT_REPLY:
+ lnet_handle_recovery_reply(ev_info, event->status);
+ break;
+ case LNET_EVENT_SEND:
+ CDEBUG(D_NET, "%s recovery message sent %s:%d\n",
+ libcfs_nid2str(ev_info->mt_nid),
+ (event->status) ? "unsuccessfully" :
+ "successfully", event->status);
+ lnet_handle_recovery_reply(ev_info, event->status);
+ break;
+ default:
+ CERROR("Unexpected event: %d\n", event->type);
+ break;
+ }
+ if (event->unlinked) {
+ LIBCFS_FREE(ev_info, sizeof(*ev_info));
+ pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
+ lnet_ping_buffer_decref(pbuf);
+ }
+}
- lnet_net_unlock(cpt);
+static int
+lnet_rsp_tracker_create(void)
+{
+ struct list_head **rstqs;
+ rstqs = lnet_create_array_of_queues();
- return rc;
+ if (!rstqs)
+ return -ENOMEM;
+
+ the_lnet.ln_mt_rstq = rstqs;
+
+ return 0;
}
-int
-lnet_send(lnet_nid_t src_nid, struct lnet_msg *msg, lnet_nid_t rtr_nid)
+static void
+lnet_rsp_tracker_clean(void)
{
- lnet_nid_t dst_nid = msg->msg_target.nid;
- int rc;
+ lnet_finalize_expired_responses(true);
- /*
- * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
- * but we might want to use pre-determined router for ACK/REPLY
- * in the future
- */
- /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
- LASSERT (msg->msg_txpeer == NULL);
- LASSERT (!msg->msg_sending);
- LASSERT (!msg->msg_target_is_router);
- LASSERT (!msg->msg_receiving);
+ cfs_percpt_free(the_lnet.ln_mt_rstq);
+ the_lnet.ln_mt_rstq = NULL;
+}
- msg->msg_sending = 1;
+int lnet_monitor_thr_start(void)
+{
+ int rc = 0;
+ struct task_struct *task;
- LASSERT(!msg->msg_tx_committed);
+ if (the_lnet.ln_mt_state != LNET_MT_STATE_SHUTDOWN)
+ return -EALREADY;
- rc = lnet_select_pathway(src_nid, dst_nid, msg, rtr_nid);
- if (rc < 0)
+ rc = lnet_resendqs_create();
+ if (rc)
return rc;
- if (rc == LNET_CREDIT_OK)
- lnet_ni_send(msg->msg_txni, msg);
+ rc = lnet_rsp_tracker_create();
+ if (rc)
+ goto clean_queues;
+
+ rc = LNetEQAlloc(0, lnet_mt_event_handler, &the_lnet.ln_mt_eqh);
+ if (rc != 0) {
+ CERROR("Can't allocate monitor thread EQ: %d\n", rc);
+ goto clean_queues;
+ }
+
+ /* Pre monitor thread start processing */
+ rc = lnet_router_pre_mt_start();
+ if (rc)
+ goto free_mem;
+
+ sema_init(&the_lnet.ln_mt_signal, 0);
+
+ the_lnet.ln_mt_state = LNET_MT_STATE_RUNNING;
+ task = kthread_run(lnet_monitor_thread, NULL, "monitor_thread");
+ if (IS_ERR(task)) {
+ rc = PTR_ERR(task);
+ CERROR("Can't start monitor thread: %d\n", rc);
+ goto clean_thread;
+ }
+
+ /* post monitor thread start processing */
+ lnet_router_post_mt_start();
- /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */
return 0;
+
+clean_thread:
+ the_lnet.ln_mt_state = LNET_MT_STATE_STOPPING;
+ /* block until event callback signals exit */
+ down(&the_lnet.ln_mt_signal);
+ /* clean up */
+ lnet_router_cleanup();
+free_mem:
+ the_lnet.ln_mt_state = LNET_MT_STATE_SHUTDOWN;
+ lnet_rsp_tracker_clean();
+ lnet_clean_local_ni_recoveryq();
+ lnet_clean_peer_ni_recoveryq();
+ lnet_clean_resendqs();
+ LNetEQFree(the_lnet.ln_mt_eqh);
+ LNetInvalidateEQHandle(&the_lnet.ln_mt_eqh);
+ return rc;
+clean_queues:
+ lnet_rsp_tracker_clean();
+ lnet_clean_local_ni_recoveryq();
+ lnet_clean_peer_ni_recoveryq();
+ lnet_clean_resendqs();
+ return rc;
+}
+
+void lnet_monitor_thr_stop(void)
+{
+ int rc;
+
+ if (the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN)
+ return;
+
+ LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
+ the_lnet.ln_mt_state = LNET_MT_STATE_STOPPING;
+
+ /* tell the monitor thread that we're shutting down */
+ wake_up(&the_lnet.ln_mt_waitq);
+
+ /* block until monitor thread signals that it's done */
+ down(&the_lnet.ln_mt_signal);
+ LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN);
+
+ /* perform cleanup tasks */
+ lnet_router_cleanup();
+ lnet_rsp_tracker_clean();
+ lnet_clean_local_ni_recoveryq();
+ lnet_clean_peer_ni_recoveryq();
+ lnet_clean_resendqs();
+ rc = LNetEQFree(the_lnet.ln_mt_eqh);
+ LASSERT(rc == 0);
+ return;
}
void
-lnet_drop_message(struct lnet_ni *ni, int cpt, void *private, unsigned int nob)
+lnet_drop_message(struct lnet_ni *ni, int cpt, void *private, unsigned int nob,
+ __u32 msg_type)
{
lnet_net_lock(cpt);
- the_lnet.ln_counters[cpt]->drop_count++;
- the_lnet.ln_counters[cpt]->drop_length += nob;
+ lnet_incr_stats(&ni->ni_stats, msg_type, LNET_STATS_TYPE_DROP);
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length += nob;
lnet_net_unlock(cpt);
lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
static int
lnet_parse_reply(struct lnet_ni *ni, struct lnet_msg *msg)
{
- void *private = msg->msg_private;
- struct lnet_hdr *hdr = &msg->msg_hdr;
+ void *private = msg->msg_private;
+ struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_process_id src = {0};
- struct lnet_libmd *md;
- int rlength;
- int mlength;
- int cpt;
+ struct lnet_libmd *md;
+ int rlength;
+ int mlength;
+ int cpt;
cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
lnet_res_lock(cpt);
static int
lnet_parse_ack(struct lnet_ni *ni, struct lnet_msg *msg)
{
- struct lnet_hdr *hdr = &msg->msg_hdr;
+ struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_process_id src = {0};
- struct lnet_libmd *md;
- int cpt;
+ struct lnet_libmd *md;
+ int cpt;
src.nid = hdr->src_nid;
src.pid = hdr->src_pid;
for_me = (ni->ni_nid == dest_nid);
cpt = lnet_cpt_of_nid(from_nid, ni);
+ CDEBUG(D_NET, "TRACE: %s(%s) <- %s : %s - %s\n",
+ libcfs_nid2str(dest_nid),
+ libcfs_nid2str(ni->ni_nid),
+ libcfs_nid2str(src_nid),
+ lnet_msgtyp2str(type),
+ (for_me) ? "for me" : "routed");
+
switch (type) {
case LNET_MSG_ACK:
case LNET_MSG_GET:
}
if (!list_empty(&the_lnet.ln_drop_rules) &&
- lnet_drop_rule_match(hdr)) {
+ lnet_drop_rule_match(hdr, NULL)) {
CDEBUG(D_NET, "%s, src %s, dst %s: Dropping %s to simulate"
"silent message loss\n",
libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
msg->msg_hdr.dest_pid = dest_pid;
msg->msg_hdr.payload_length = payload_length;
}
- /* Multi-Rail: Primary NID of source. */
- msg->msg_initiator = lnet_peer_primary_nid(src_nid);
lnet_net_lock(cpt);
- lpni = lnet_nid2peerni_locked(from_nid, cpt);
+ lpni = lnet_nid2peerni_locked(from_nid, ni->ni_nid, cpt);
if (IS_ERR(lpni)) {
lnet_net_unlock(cpt);
CERROR("%s, src %s: Dropping %s "
msg->msg_rxpeer = lpni;
msg->msg_rxni = ni;
lnet_ni_addref_locked(ni, cpt);
+ /* Multi-Rail: Primary NID of source. */
+ msg->msg_initiator = lnet_peer_primary_nid_locked(src_nid);
if (lnet_isrouter(msg->msg_rxpeer)) {
lnet_peer_set_alive(msg->msg_rxpeer);
lnet_finalize(msg, rc);
drop:
- lnet_drop_message(ni, cpt, private, payload_length);
+ lnet_drop_message(ni, cpt, private, payload_length, type);
return 0;
}
EXPORT_SYMBOL(lnet_parse);
* until that's done */
lnet_drop_message(msg->msg_rxni, msg->msg_rx_cpt,
- msg->msg_private, msg->msg_len);
+ msg->msg_private, msg->msg_len,
+ msg->msg_type);
+
+ msg->msg_no_resend = true;
/*
* NB: message will not generate event because w/o attached MD,
* but we still should give error code so lnet_msg_decommit()
}
}
+static void
+lnet_attach_rsp_tracker(struct lnet_rsp_tracker *rspt, int cpt,
+ struct lnet_libmd *md, struct lnet_handle_md mdh)
+{
+ s64 timeout_ns;
+
+ /*
+ * MD has a refcount taken by message so it's not going away.
+ * The MD however can be looked up. We need to secure the access
+ * to the md_rspt_ptr by taking the res_lock.
+ * The rspt can be accessed without protection up to when it gets
+ * added to the list.
+ */
+
+ /* debug code */
+ LASSERT(md->md_rspt_ptr == NULL);
+
+ /* we'll use that same event in case we never get a response */
+ rspt->rspt_mdh = mdh;
+ rspt->rspt_cpt = cpt;
+ timeout_ns = lnet_transaction_timeout * NSEC_PER_SEC;
+ rspt->rspt_deadline = ktime_add_ns(ktime_get(), timeout_ns);
+
+ lnet_res_lock(cpt);
+ /* store the rspt so we can access it when we get the REPLY */
+ md->md_rspt_ptr = rspt;
+ lnet_res_unlock(cpt);
+
+ /*
+ * add to the list of tracked responses. It's added to tail of the
+ * list in order to expire all the older entries first.
+ */
+ lnet_net_lock(cpt);
+ list_add_tail(&rspt->rspt_on_list, the_lnet.ln_mt_rstq[cpt]);
+ lnet_net_unlock(cpt);
+}
+
/**
* Initiate an asynchronous PUT operation.
*
__u64 match_bits, unsigned int offset,
__u64 hdr_data)
{
- struct lnet_msg *msg;
- struct lnet_libmd *md;
- int cpt;
- int rc;
+ struct lnet_msg *msg;
+ struct lnet_libmd *md;
+ int cpt;
+ int rc;
+ struct lnet_rsp_tracker *rspt = NULL;
LASSERT(the_lnet.ln_refcount > 0);
msg->msg_vmflush = !!memory_pressure_get();
cpt = lnet_cpt_of_cookie(mdh.cookie);
+
+ if (ack == LNET_ACK_REQ) {
+ rspt = lnet_rspt_alloc(cpt);
+ if (!rspt) {
+ CERROR("Dropping PUT to %s: ENOMEM on response tracker\n",
+ libcfs_id2str(target));
+ return -ENOMEM;
+ }
+ INIT_LIST_HEAD(&rspt->rspt_on_list);
+ }
+
lnet_res_lock(cpt);
md = lnet_handle2md(&mdh);
md->md_me->me_portal);
lnet_res_unlock(cpt);
+ LIBCFS_FREE(rspt, sizeof(*rspt));
lnet_msg_free(msg);
return -ENOENT;
}
lnet_build_msg_event(msg, LNET_EVENT_SEND);
+ if (ack == LNET_ACK_REQ)
+ lnet_attach_rsp_tracker(rspt, cpt, md, mdh);
+
rc = lnet_send(self, msg, LNET_NID_ANY);
if (rc != 0) {
CNETERR("Error sending PUT to %s: %d\n",
libcfs_id2str(target), rc);
+ msg->msg_no_resend = true;
+ lnet_detach_rsp_tracker(msg->msg_md, cpt);
lnet_finalize(msg, rc);
}
libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
/* setup information for lnet_build_msg_event */
- msg->msg_initiator = lnet_peer_primary_nid(peer_id.nid);
- /* Cheaper: msg->msg_initiator = getmsg->msg_txpeer->lp_nid; */
+ msg->msg_initiator = getmsg->msg_txpeer->lpni_peer_net->lpn_peer->lp_primary_nid;
msg->msg_from = peer_id.nid;
msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
msg->msg_hdr.src_nid = peer_id.nid;
cpt = lnet_cpt_of_nid(peer_id.nid, ni);
lnet_net_lock(cpt);
- the_lnet.ln_counters[cpt]->drop_count++;
- the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
+ lnet_incr_stats(&ni->ni_stats, LNET_MSG_GET, LNET_STATS_TYPE_DROP);
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
+ the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length +=
+ getmd->md_length;
lnet_net_unlock(cpt);
if (msg != NULL)
int
LNetGet(lnet_nid_t self, struct lnet_handle_md mdh,
struct lnet_process_id target, unsigned int portal,
- __u64 match_bits, unsigned int offset)
+ __u64 match_bits, unsigned int offset, bool recovery)
{
- struct lnet_msg *msg;
- struct lnet_libmd *md;
- int cpt;
- int rc;
+ struct lnet_msg *msg;
+ struct lnet_libmd *md;
+ struct lnet_rsp_tracker *rspt;
+ int cpt;
+ int rc;
LASSERT(the_lnet.ln_refcount > 0);
}
msg = lnet_msg_alloc();
- if (msg == NULL) {
+ if (!msg) {
CERROR("Dropping GET to %s: ENOMEM on struct lnet_msg\n",
libcfs_id2str(target));
return -ENOMEM;
}
cpt = lnet_cpt_of_cookie(mdh.cookie);
+
+ rspt = lnet_rspt_alloc(cpt);
+ if (!rspt) {
+ CERROR("Dropping GET to %s: ENOMEM on response tracker\n",
+ libcfs_id2str(target));
+ return -ENOMEM;
+ }
+ INIT_LIST_HEAD(&rspt->rspt_on_list);
+
+ msg->msg_recovery = recovery;
+
lnet_res_lock(cpt);
md = lnet_handle2md(&mdh);
lnet_res_unlock(cpt);
lnet_msg_free(msg);
+ LIBCFS_FREE(rspt, sizeof(*rspt));
return -ENOENT;
}
lnet_build_msg_event(msg, LNET_EVENT_SEND);
+ lnet_attach_rsp_tracker(rspt, cpt, md, mdh);
+
rc = lnet_send(self, msg, LNET_NID_ANY);
if (rc < 0) {
CNETERR("Error sending GET to %s: %d\n",
libcfs_id2str(target), rc);
+ msg->msg_no_resend = true;
+ lnet_detach_rsp_tracker(msg->msg_md, cpt);
lnet_finalize(msg, rc);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff