[PATCH] IB/cache: update gid cache on client reregister event

[Etienne AUJAMES <eaujames@ddn.com>]

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

Since the d58c23c92548, 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 onrespective events")
Signed-off-by: Etienne AUJAMES <eaujames@ddn.com>
---
 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 81cf3c902e81..0fc1c5bce2f0 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -1537,7 +1537,8 @@ 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);
 
-- 
2.51.1