queue-6.6/ib-cache-update-gid-cache-on-client-reregister-event.patch

From 9b654fba17b6377b1960e2ea4fb602e501a6acde Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Wed, 31 Dec 2025 14:07:45 +0100
Subject: IB/cache: update gid cache on client reregister event
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From: Etienne AUJAMES <eaujames@ddn.com>

[ Upstream commit ddd6c8c873e912cb1ead79def54de5e24ff71c80 ]

Some HCAs (e.g: ConnectX4) do not trigger a IB_EVENT_GID_CHANGE on
subnet prefix update from SM (PortInfo).

Since the commit d58c23c92548 ("IB/core: Only update PKEY and GID caches
on respective events"), the GID cache is updated exclusively on
IB_EVENT_GID_CHANGE. If this event is not emitted, the subnet prefix in the
IPoIB interface’s hardware address remains set to its default value
(0xfe80000000000000).

Then rdma_bind_addr() failed because it relies on hardware address to
find the port GID (subnet_prefix + port GUID).

This patch fixes this issue by updating the GID cache on
IB_EVENT_CLIENT_REREGISTER event (emitted on PortInfo::ClientReregister=1).

Fixes: d58c23c92548 ("IB/core: Only update PKEY and GID caches on respective events")
Signed-off-by: Etienne AUJAMES <eaujames@ddn.com>
Link: https://patch.msgid.link/aVUfsO58QIDn5bGX@eaujamesFR0130
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/core/cache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 77c0b89259911..7ed9915f7893e 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -1566,7 +1566,8 @@ static void ib_cache_event_task(struct work_struct *_work)
 	 * the cache.
 	 */
 	ret = ib_cache_update(work->event.device, work->event.element.port_num,
-			      work->event.event == IB_EVENT_GID_CHANGE,
+			      work->event.event == IB_EVENT_GID_CHANGE ||
+			      work->event.event == IB_EVENT_CLIENT_REREGISTER,
 			      work->event.event == IB_EVENT_PKEY_CHANGE,
 			      work->enforce_security);
 
-- 
2.51.0