From: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Date: Fri, 24 Jul 2020 16:45:06 +0530
Subject: RDMA/rtrs-clt: add an additional random 8 seconds before reconnecting
Patch-mainline: v5.9-rc1
Git-commit: 09e0dbbeed82e35ce2cd21e086a6fac934163e2a
References: jsc#SLE-15176

In order to avoid all the clients to start reconnecting at the same time
schedule the reconnect dwork with a random jitter of +[0,8] seconds.

Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
Link: https://lore.kernel.org/r/20200724111508.15734-2-haris.iqbal@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Md Haris Iqbal <haris.iqbal@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/ulp/rtrs/rtrs-clt.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -12,6 +12,7 @@
 
 #include <linux/module.h>
 #include <linux/rculist.h>
+#include <linux/random.h>
 
 #include "rtrs-clt.h"
 #include "rtrs-log.h"
@@ -23,6 +24,12 @@
  * leads to "false positives" failed reconnect attempts
  */
 #define RTRS_RECONNECT_BACKOFF 1000
+/*
+ * Wait for additional random time between 0 and 8 seconds
+ * before starting to reconnect to avoid clients reconnecting
+ * all at once in case of a major network outage
+ */
+#define RTRS_RECONNECT_SEED 8
 
 MODULE_DESCRIPTION("RDMA Transport Client");
 MODULE_LICENSE("GPL");
@@ -306,7 +313,8 @@ static void rtrs_rdma_error_recovery(str
 		 */
 		delay_ms = clt->reconnect_delay_sec * 1000;
 		queue_delayed_work(rtrs_wq, &sess->reconnect_dwork,
-				   msecs_to_jiffies(delay_ms));
+				   msecs_to_jiffies(delay_ms +
+						    prandom_u32() % RTRS_RECONNECT_SEED));
 	} else {
 		/*
 		 * Error can happen just on establishing new connection,
@@ -2503,7 +2511,9 @@ reconnect_again:
 		sess->stats->reconnects.fail_cnt++;
 		delay_ms = clt->reconnect_delay_sec * 1000;
 		queue_delayed_work(rtrs_wq, &sess->reconnect_dwork,
-				   msecs_to_jiffies(delay_ms));
+				   msecs_to_jiffies(delay_ms +
+						    prandom_u32() %
+						    RTRS_RECONNECT_SEED));
 	}
 }