CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444,
"Assume routers are down and ping them before use");
-static int dead_router_check_interval = 0;
+static int avoid_asym_router_failure = 0;
+CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0444,
+ "Avoid asymmetrical failures: reserved, use at your own risk");
+
+int dead_router_check_interval = 0;
CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0444,
"Seconds between dead router health checks (<= 0 to disable)");
-static int live_router_check_interval = 0;
+int live_router_check_interval = 0;
CFS_MODULE_PARM(live_router_check_interval, "i", int, 0444,
"Seconds between live router health checks (<= 0 to disable)");
-static int router_ping_timeout = 50;
+int router_ping_timeout = 50;
CFS_MODULE_PARM(router_ping_timeout, "i", int, 0444,
"Seconds to wait for the reply to a router health query");
}
void
-lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, time_t when)
+lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
{
- if (when < lp->lp_timestamp) { /* out of date information */
+ if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
CDEBUG(D_NET, "Out of date\n");
return;
}
lp->lp_rtr_refcount--;
if (lp->lp_rtr_refcount == 0) {
+ if (lp->lp_rcd != NULL) {
+ list_add(&lp->lp_rcd->rcd_list,
+ &the_lnet.ln_zombie_rcd);
+ lp->lp_rcd = NULL;
+ }
+
list_del(&lp->lp_rtr_list);
/* decref for the_lnet.ln_routers */
lnet_peer_decref_locked(lp);
}
void
+lnet_swap_pinginfo(lnet_ping_info_t *info)
+{
+ int i;
+ lnet_ni_status_t *stat;
+
+ __swab32s(&info->pi_version);
+ __swab32s(&info->pi_pid);
+ __swab32s(&info->pi_nnis);
+ for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
+ stat = &info->pi_ni[i];
+ __swab64s(&stat->ns_nid);
+ __swab32s(&stat->ns_status);
+ }
+ return;
+}
+
+/* Returns # of down NIs, or negative error codes; ignore downed NIs
+ * if a NI in 'net' is up */
+int
+lnet_router_down_ni(lnet_peer_t *rtr, __u32 net)
+{
+ int i;
+ int down = 0;
+ int ptl_up = 0;
+ int ptl_down = 0;
+ lnet_ping_info_t *info;
+
+ if (!avoid_asym_router_failure)
+ return -ENOENT;
+
+ if (rtr->lp_rcd == NULL)
+ return -EINVAL;
+
+ if (!rtr->lp_alive)
+ return -EINVAL; /* stale lp_rcd */
+
+ info = rtr->lp_rcd->rcd_pinginfo;
+ LASSERT (info != NULL);
+
+ /* NB always racing with network! */
+ if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
+ lnet_swap_pinginfo(info);
+ } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
+ CDEBUG(D_NETERROR, "%s: Unexpected magic %08x\n",
+ libcfs_nid2str(rtr->lp_nid), info->pi_magic);
+ return -EPROTO;
+ }
+
+ if (info->pi_version == LNET_PROTO_PING_VERSION1)
+ return -ENOENT; /* v1 doesn't carry NI status info */
+
+ if (info->pi_version != LNET_PROTO_PING_VERSION) {
+ CDEBUG(D_NETERROR, "%s: Unexpected version 0x%x\n",
+ libcfs_nid2str(rtr->lp_nid), info->pi_version);
+ return -EPROTO;
+ }
+
+ for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
+ lnet_ni_status_t *stat = &info->pi_ni[i];
+ lnet_nid_t nid = stat->ns_nid;
+
+ if (nid == LNET_NID_ANY) {
+ CDEBUG(D_NETERROR, "%s: unexpected LNET_NID_ANY\n",
+ libcfs_nid2str(rtr->lp_nid));
+ return -EPROTO;
+ }
+
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
+ continue;
+
+ if (stat->ns_status == LNET_NI_STATUS_DOWN) {
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
+ ptl_down = 1;
+ else
+ down++;
+ continue;
+ }
+
+ if (stat->ns_status != LNET_NI_STATUS_UP) {
+ CDEBUG(D_NETERROR, "%s: Unexpected status 0x%x\n",
+ libcfs_nid2str(rtr->lp_nid), stat->ns_status);
+ return -EPROTO;
+ }
+
+ /* ignore downed NIs if there's a NI up for dest network */
+ if (LNET_NIDNET(nid) == net)
+ return 0;
+
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
+ ptl_up = 1;
+ }
+
+ /* ptl NIs are considered down only when they're all down */
+ return down + (ptl_up ? 0 : ptl_down);
+}
+
+void
lnet_wait_known_routerstate(void)
{
lnet_peer_t *rtr;
/* CAVEAT EMPTOR: I'm called with LNET_LOCKed and I'm not allowed to
* drop it (that's how come I see _every_ event, even ones that would
* overflow my EQ) */
- lnet_peer_t *lp;
- lnet_nid_t nid;
+ lnet_rc_data_t *rcd = event->md.user_ptr;
+ lnet_peer_t *lp;
+ lnet_nid_t nid;
if (event->unlinked) {
- /* The router checker thread has unlinked the rc_md
+ if (rcd != NULL) {
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ return;
+ }
+
+ /* The router checker thread has unlinked the default rc_md
* and exited. */
LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKING);
the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKED;
* apps get burned). */
lnet_notify_locked(lp, 1, (event->status == 0),
- cfs_time_current_sec());
+ cfs_time_current());
/* The router checker will wake up very shortly and do the
* actual notification.
lnet_peer_decref_locked(lp);
}
+void
+lnet_update_ni_status(void)
+{
+ cfs_time_t now = cfs_time_current();
+ lnet_ni_t *ni;
+ int status;
+ int timeout;
+
+ LASSERT (the_lnet.ln_routing);
+
+ timeout = router_ping_timeout +
+ MAX(live_router_check_interval, dead_router_check_interval);
+
+ LNET_LOCK();
+
+ list_for_each_entry (ni, &the_lnet.ln_nis, ni_list) {
+ lnet_ni_status_t *ns = ni->ni_status;
+
+ LASSERT (ns != NULL);
+
+ status = LNET_NI_STATUS_UP;
+ if (ni->ni_lnd->lnd_type != LOLND && /* @lo forever alive */
+ cfs_time_after(now, cfs_time_add(ni->ni_last_alive,
+ cfs_time_seconds(timeout))))
+ status = LNET_NI_STATUS_DOWN;
+
+ if (ns->ns_status != status) {
+ ns->ns_status = status;
+ CDEBUG(D_NET, "NI(%s:%d) status changed to %s\n",
+ libcfs_nid2str(ni->ni_nid), timeout,
+ status == LNET_NI_STATUS_UP ? "up" : "down");
+ }
+ }
+
+ LNET_UNLOCK();
+}
+
+void
+lnet_destroy_rc_data (lnet_rc_data_t *rcd)
+{
+ LASSERT (list_empty(&rcd->rcd_list));
+ /* detached from network */
+ LASSERT (LNetHandleIsInvalid(rcd->rcd_mdh));
+
+ LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
+ LIBCFS_FREE(rcd, sizeof(*rcd));
+ return;
+}
+
+lnet_rc_data_t *
+lnet_create_rc_data (void)
+{
+ int i;
+ int rc;
+ lnet_ping_info_t *pi;
+ lnet_rc_data_t *rcd;
+
+ LIBCFS_ALLOC(rcd, sizeof(*rcd));
+ if (rcd == NULL)
+ return NULL;
+
+ LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
+ if (pi == NULL) {
+ LIBCFS_FREE(rcd, sizeof(*rcd));
+ return NULL;
+ }
+
+ memset(pi, 0, LNET_PINGINFO_SIZE);
+ for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
+ pi->pi_ni[i].ns_nid = LNET_NID_ANY;
+ pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
+ }
+ rcd->rcd_pinginfo = pi;
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ CFS_INIT_LIST_HEAD(&rcd->rcd_list);
+
+ LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
+ rc = LNetMDBind((lnet_md_t){.start = pi,
+ .user_ptr = rcd,
+ .length = LNET_PINGINFO_SIZE,
+ .threshold = LNET_MD_THRESH_INF,
+ .options = LNET_MD_TRUNCATE,
+ .eq_handle = the_lnet.ln_rc_eqh},
+ LNET_UNLINK,
+ &rcd->rcd_mdh);
+ if (rc < 0) {
+ CERROR("Can't bind MD: %d\n", rc);
+ lnet_destroy_rc_data(rcd);
+ return NULL;
+ }
+ LASSERT (rc == 0);
+ return rcd;
+}
+
static int
lnet_router_check_interval (lnet_peer_t *rtr)
{
static void
lnet_ping_router_locked (lnet_peer_t *rtr)
{
- lnet_process_id_t id;
- int secs;
- time_t now = cfs_time_current_sec();
+ int newrcd = 0;
+ lnet_rc_data_t *rcd = NULL;
+ cfs_time_t now = cfs_time_current();
+ int secs;
lnet_peer_addref_locked(rtr);
if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
- now > rtr->lp_ping_deadline)
+ cfs_time_after(now, rtr->lp_ping_deadline))
lnet_notify_locked(rtr, 1, 0, now);
+ if (avoid_asym_router_failure && rtr->lp_rcd == NULL)
+ newrcd = 1;
+
LNET_UNLOCK();
/* Run any outstanding notifications */
lnet_do_notify(rtr);
+ if (newrcd)
+ rcd = lnet_create_rc_data();
+
LNET_LOCK();
+ if (!lnet_isrouter(rtr)) {
+ lnet_peer_decref_locked(rtr);
+ if (rcd != NULL)
+ list_add(&rcd->rcd_list, &the_lnet.ln_zombie_rcd);
+ return; /* router table changed! */
+ }
+
+ if (rcd != NULL) {
+ LASSERT (rtr->lp_rcd == NULL);
+ rtr->lp_rcd = rcd;
+ }
+
secs = lnet_router_check_interval(rtr);
CDEBUG(D_NET,
rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
if (secs != 0 && !rtr->lp_ping_notsent &&
- now > rtr->lp_ping_timestamp + secs) {
+ cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
+ cfs_time_seconds(secs)))) {
+ int rc;
+ lnet_process_id_t id;
+ lnet_handle_md_t mdh;
+
id.nid = rtr->lp_nid;
id.pid = LUSTRE_SRV_LNET_PID;
CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
rtr->lp_ping_notsent = 1;
rtr->lp_ping_timestamp = now;
+ mdh = (rtr->lp_rcd == NULL) ? the_lnet.ln_rc_mdh :
+ rtr->lp_rcd->rcd_mdh;
if (rtr->lp_ping_deadline == 0)
- rtr->lp_ping_deadline = now + router_ping_timeout;
+ rtr->lp_ping_deadline = cfs_time_shift(router_ping_timeout);
LNET_UNLOCK();
- LNetGet(LNET_NID_ANY, the_lnet.ln_rc_mdh, id,
- LNET_RESERVED_PORTAL, LNET_PROTO_PING_MATCHBITS, 0);
+ rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
+ LNET_PROTO_PING_MATCHBITS, 0);
LNET_LOCK();
+ if (rc != 0)
+ rtr->lp_ping_notsent = 0; /* no event pending */
}
lnet_peer_decref_locked(rtr);
return -EINVAL;
}
- if (live_router_check_interval <= 0 &&
+ if (!the_lnet.ln_routing &&
+ live_router_check_interval <= 0 &&
dead_router_check_interval <= 0)
return 0;
}
memset(&md, 0, sizeof(md));
+ md.user_ptr = NULL;
md.start = &pinginfo;
md.length = sizeof(pinginfo);
md.options = LNET_MD_TRUNCATE;
#if defined(__KERNEL__) && defined(LNET_ROUTER)
+static void
+lnet_prune_zombie_rcd (int wait_unlink)
+{
+ lnet_rc_data_t *rcd;
+ lnet_rc_data_t *tmp;
+ struct list_head free_rcd;
+ int i;
+ __u64 version;
+
+ CFS_INIT_LIST_HEAD(&free_rcd);
+
+ LNET_LOCK();
+rescan:
+ version = the_lnet.ln_routers_version;
+ list_for_each_entry_safe (rcd, tmp, &the_lnet.ln_zombie_rcd, rcd_list) {
+ if (LNetHandleIsInvalid(rcd->rcd_mdh)) {
+ list_del(&rcd->rcd_list);
+ list_add(&rcd->rcd_list, &free_rcd);
+ continue;
+ }
+
+ LNET_UNLOCK();
+
+ LNetMDUnlink(rcd->rcd_mdh);
+
+ LNET_LOCK();
+ if (version != the_lnet.ln_routers_version)
+ goto rescan;
+ }
+
+ i = 2;
+ while (wait_unlink && !list_empty(&the_lnet.ln_zombie_rcd)) {
+ rcd = list_entry(the_lnet.ln_zombie_rcd.next,
+ lnet_rc_data_t, rcd_list);
+ if (LNetHandleIsInvalid(rcd->rcd_mdh)) {
+ list_del(&rcd->rcd_list);
+ list_add(&rcd->rcd_list, &free_rcd);
+ continue;
+ }
+
+ LNET_UNLOCK();
+
+ LNetMDUnlink(rcd->rcd_mdh);
+
+ i++;
+ CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
+ "Waiting for rc buffers to unlink\n");
+ cfs_pause(cfs_time_seconds(1));
+
+ LNET_LOCK();
+ }
+
+ LNET_UNLOCK();
+
+ while (!list_empty(&free_rcd)) {
+ rcd = list_entry(free_rcd.next, lnet_rc_data_t, rcd_list);
+ list_del_init(&rcd->rcd_list);
+ lnet_destroy_rc_data(rcd);
+ }
+ return;
+}
+
static int
lnet_router_checker(void *arg)
{
LNET_UNLOCK();
+ if (the_lnet.ln_routing)
+ lnet_update_ni_status();
+
+ lnet_prune_zombie_rcd(0); /* don't wait for UNLINK */
+
/* Call cfs_pause() here always adds 1 to load average
* because kernel counts # active tasks as nr_running
* + nr_uninterruptible. */
cfs_time_seconds(1));
}
+ LNET_LOCK();
+
+ list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+
+ if (rtr->lp_rcd == NULL)
+ continue;
+
+ LASSERT (list_empty(&rtr->lp_rcd->rcd_list));
+ list_add(&rtr->lp_rcd->rcd_list, &the_lnet.ln_zombie_rcd);
+ rtr->lp_rcd = NULL;
+ }
+
+ LNET_UNLOCK();
+
+ lnet_prune_zombie_rcd(1); /* wait for UNLINK */
+
LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_STOPTHREAD);
the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKING;
}
int
-lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
+lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
{
- lnet_peer_t *lp = NULL;
- time_t now = cfs_time_current_sec();
+ lnet_peer_t *lp = NULL;
+ cfs_time_t now = cfs_time_current();
LASSERT (!in_interrupt ());
}
/* can't do predictions... */
- if (when > now) {
+ if (cfs_time_after(when, now)) {
CWARN ("Ignoring prediction from %s of %s %s "
"%ld seconds in the future\n",
(ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
libcfs_nid2str(nid), alive ? "up" : "down",
- when - now);
+ cfs_duration_sec(cfs_time_sub(when, now)));
return -EINVAL;
}
#else
int
-lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
+lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
{
return -EOPNOTSUPP;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff