From 1a9be843eda641a2ce9d6a01c029690a754a77ad Mon Sep 17 00:00:00 2001 From: Amir Shehata Date: Mon, 22 Feb 2016 17:29:19 -0500 Subject: [PATCH] staging: lustre: remove messages from lazy portal on NI shutdown When shutting down an NI in a busy system, some messages received on this NI, might be on the lazy portal. They would have grabbed a ref count on the NI. Therefore NI will not be removed until messages are processed. In order to avoid this scenario, when an NI is shutdown go through all messages queued on the lazy portal and drop messages for the NI being shutdown Signed-off-by: Amir Shehata Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6040 Reviewed-on: http://review.whamcloud.com/13836 Reviewed-by: Isaac Huang Reviewed-by: Liang Zhen Reviewed-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- .../lustre/include/linux/lnet/lib-lnet.h | 1 + drivers/staging/lustre/lnet/lnet/api-ni.c | 6 +++ drivers/staging/lustre/lnet/lnet/lib-ptl.c | 54 ++++++++++++------- 3 files changed, 43 insertions(+), 18 deletions(-) diff --git a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h index 0928bc92c897..a5f1aecfa10a 100644 --- a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h +++ b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h @@ -482,6 +482,7 @@ int lnet_dyn_add_ni(lnet_pid_t requested_pid, char *nets, __s32 peer_timeout, __s32 peer_cr, __s32 peer_buf_cr, __s32 credits); int lnet_dyn_del_ni(__u32 net); +int lnet_clear_lazy_portal(struct lnet_ni *ni, int portal, char *reason); int lnet_islocalnid(lnet_nid_t nid); int lnet_islocalnet(__u32 net); diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c index 0c7db1930992..3ecc96a6c5b9 100644 --- a/drivers/staging/lustre/lnet/lnet/api-ni.c +++ b/drivers/staging/lustre/lnet/lnet/api-ni.c @@ -1196,10 +1196,16 @@ lnet_shutdown_lndnis(void) static void lnet_shutdown_lndni(struct lnet_ni *ni) { + int i; + lnet_net_lock(LNET_LOCK_EX); lnet_ni_unlink_locked(ni); lnet_net_unlock(LNET_LOCK_EX); + /* clear messages for this NI on the lazy portal */ + for (i = 0; i < the_lnet.ln_nportals; i++) + lnet_clear_lazy_portal(ni, i, "Shutting down NI"); + /* Do peer table cleanup for this ni */ lnet_peer_tables_cleanup(ni); diff --git a/drivers/staging/lustre/lnet/lnet/lib-ptl.c b/drivers/staging/lustre/lnet/lnet/lib-ptl.c index 0cdeea96f0b1..5a9ab8727764 100644 --- a/drivers/staging/lustre/lnet/lnet/lib-ptl.c +++ b/drivers/staging/lustre/lnet/lnet/lib-ptl.c @@ -902,17 +902,8 @@ LNetSetLazyPortal(int portal) } EXPORT_SYMBOL(LNetSetLazyPortal); -/** - * Turn off the lazy portal attribute. Delayed requests on the portal, - * if any, will be all dropped when this function returns. - * - * \param portal Index of the portal to disable the lazy attribute on. - * - * \retval 0 On success. - * \retval -EINVAL If \a portal is not a valid index. - */ int -LNetClearLazyPortal(int portal) +lnet_clear_lazy_portal(struct lnet_ni *ni, int portal, char *reason) { struct lnet_portal *ptl; LIST_HEAD(zombies); @@ -931,21 +922,48 @@ LNetClearLazyPortal(int portal) return 0; } - if (the_lnet.ln_shutdown) - CWARN("Active lazy portal %d on exit\n", portal); - else - CDEBUG(D_NET, "clearing portal %d lazy\n", portal); + if (ni) { + struct lnet_msg *msg, *tmp; - /* grab all the blocked messages atomically */ - list_splice_init(&ptl->ptl_msg_delayed, &zombies); + /* grab all messages which are on the NI passed in */ + list_for_each_entry_safe(msg, tmp, &ptl->ptl_msg_delayed, + msg_list) { + if (msg->msg_rxpeer->lp_ni == ni) + list_move(&msg->msg_list, &zombies); + } + } else { + if (the_lnet.ln_shutdown) + CWARN("Active lazy portal %d on exit\n", portal); + else + CDEBUG(D_NET, "clearing portal %d lazy\n", portal); + + /* grab all the blocked messages atomically */ + list_splice_init(&ptl->ptl_msg_delayed, &zombies); - lnet_ptl_unsetopt(ptl, LNET_PTL_LAZY); + lnet_ptl_unsetopt(ptl, LNET_PTL_LAZY); + } lnet_ptl_unlock(ptl); lnet_res_unlock(LNET_LOCK_EX); - lnet_drop_delayed_msg_list(&zombies, "Clearing lazy portal attr"); + lnet_drop_delayed_msg_list(&zombies, reason); return 0; } + +/** + * Turn off the lazy portal attribute. Delayed requests on the portal, + * if any, will be all dropped when this function returns. + * + * \param portal Index of the portal to disable the lazy attribute on. + * + * \retval 0 On success. + * \retval -EINVAL If \a portal is not a valid index. + */ +int +LNetClearLazyPortal(int portal) +{ + return lnet_clear_lazy_portal(NULL, portal, + "Clearing lazy portal attr"); +} EXPORT_SYMBOL(LNetClearLazyPortal); -- 2.45.2