From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Simmons Date: Tue, 11 Aug 2020 08:20:18 -0400 Subject: [lustre-devel] [PATCH 22/23] lnet: Have LNet routers monitor the ni_fatal flag In-Reply-To: <1597148419-20629-1-git-send-email-jsimmons@infradead.org> References: <1597148419-20629-1-git-send-email-jsimmons@infradead.org> Message-ID: <1597148419-20629-23-git-send-email-jsimmons@infradead.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org From: Chris Horn Have the LNet monitor thread on LNet routers check the ni_fatal_error_on flag to set local NI status appropriately. When this results in a status change, perform a discovery push to all peers. This allows peers to update their route status appropriately. HPE-bug-id: LUS-9068 WC-bug-id: https://jira.whamcloud.com/browse/LU-13782 Lustre-commit: 7e0ec0f809ea1 ("LU-13782 lnet: Have LNet routers monitor the ni_fatal flag") Signed-off-by: Chris Horn Reviewed-on: https://review.whamcloud.com/39353 Reviewed-by: Neil Brown Reviewed-by: Amir Shehata Reviewed-by: Oleg Drokin Signed-off-by: James Simmons --- include/linux/lnet/lib-lnet.h | 29 +++++++++++++++++++++++++++++ net/lnet/lnet/lib-move.c | 6 +----- net/lnet/lnet/router.c | 35 ++++++++++++++++++++++++----------- 3 files changed, 54 insertions(+), 16 deletions(-) diff --git a/include/linux/lnet/lib-lnet.h b/include/linux/lnet/lib-lnet.h index 299ecf5..d2a39f6 100644 --- a/include/linux/lnet/lib-lnet.h +++ b/include/linux/lnet/lib-lnet.h @@ -98,6 +98,35 @@ extern struct kmem_cache *lnet_rspt_cachep; extern struct kmem_cache *lnet_msg_cachep; +static inline bool +lnet_ni_set_status_locked(struct lnet_ni *ni, u32 status) +__must_hold(&ni->ni_lock) +{ + bool update = false; + + if (ni->ni_status && ni->ni_status->ns_status != status) { + CDEBUG(D_NET, "ni %s status changed from %#x to %#x\n", + libcfs_nid2str(ni->ni_nid), + ni->ni_status->ns_status, status); + ni->ni_status->ns_status = status; + update = true; + } + + return update; +} + +static inline bool +lnet_ni_set_status(struct lnet_ni *ni, u32 status) +{ + bool update; + + spin_lock(&ni->ni_lock); + update = lnet_ni_set_status_locked(ni, status); + spin_unlock(&ni->ni_lock); + + return update; +} + bool lnet_is_route_alive(struct lnet_route *route); bool lnet_is_gateway_alive(struct lnet_peer *gw); diff --git a/net/lnet/lnet/lib-move.c b/net/lnet/lnet/lib-move.c index 85b6453..f521817 100644 --- a/net/lnet/lnet/lib-move.c +++ b/net/lnet/lnet/lib-move.c @@ -4012,11 +4012,7 @@ void lnet_monitor_thr_stop(void) spin_lock(&ni->ni_net->net_lock); ni->ni_net->net_last_alive = ktime_get_real_seconds(); spin_unlock(&ni->ni_net->net_lock); - if (ni->ni_status && - ni->ni_status->ns_status == LNET_NI_STATUS_DOWN) { - ni->ni_status->ns_status = LNET_NI_STATUS_UP; - push = true; - } + push = lnet_ni_set_status_locked(ni, LNET_NI_STATUS_UP); lnet_ni_unlock(ni); } diff --git a/net/lnet/lnet/router.c b/net/lnet/lnet/router.c index e3b3e71..1253e4c 100644 --- a/net/lnet/lnet/router.c +++ b/net/lnet/lnet/router.c @@ -1014,15 +1014,9 @@ int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) struct lnet_ni *ni; bool update = false; - list_for_each_entry(ni, &net->net_ni_list, ni_netlist) { - lnet_ni_lock(ni); - if (ni->ni_status && - ni->ni_status->ns_status != status) { - ni->ni_status->ns_status = status; + list_for_each_entry(ni, &net->net_ni_list, ni_netlist) + if (lnet_ni_set_status(ni, status)) update = true; - } - lnet_ni_unlock(ni); - } return update; } @@ -1031,6 +1025,7 @@ int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) lnet_update_ni_status_locked(void) { struct lnet_net *net; + struct lnet_ni *ni; bool push = false; time64_t now; time64_t timeout; @@ -1045,13 +1040,13 @@ int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) continue; if (now < net->net_last_alive + timeout) - continue; + goto check_ni_fatal; spin_lock(&net->net_lock); /* re-check with lock */ if (now < net->net_last_alive + timeout) { spin_unlock(&net->net_lock); - continue; + goto check_ni_fatal; } spin_unlock(&net->net_lock); @@ -1059,7 +1054,25 @@ int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) * timeout on any of its constituent NIs, then mark all * the NIs down. */ - push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN); + if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) { + push = true; + continue; + } + +check_ni_fatal: + list_for_each_entry(ni, &net->net_ni_list, ni_netlist) { + /* lnet_ni_set_status() will perform the same check of + * ni_status while holding the ni lock. We can safely + * check ni_status without that lock because it is only + * written to under net_lock/EX and our caller is + * holding a net lock. + */ + if (atomic_read(&ni->ni_fatal_error_on) && + ni->ni_status && + ni->ni_status->ns_status != LNET_NI_STATUS_DOWN && + lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN)) + push = true; + } } return push; -- 1.8.3.1