[PATCH 5.4 138/320] RDMA/core: Let ib_find_gid() continue search even after empty entry

Greg Kroah-Hartman
2022-01-25T03:23:54Z

From: Avihai Horon <avihaih@nvidia.com>

[ Upstream commit 483d805191a23191f8294bbf9b4e94836f5d92e4 ]

Currently, ib_find_gid() will stop searching after encountering the first
empty GID table entry. This behavior is wrong since neither IB nor RoCE
spec enforce tightly packed GID tables.

For example, when a valid GID entry exists at index N, and if a GID entry
is empty at index N-1, ib_find_gid() will fail to find the valid entry.

Fix it by making ib_find_gid() continue searching even after encountering
missing entries.

Fixes: 5eb620c81ce3 ("IB/core: Add helpers for uncached GID and P_Key searches")
Link: https://lore.kernel.org/r/e55d331b96cecfc2cf19803d16e7109ea966882d.1639055490.git.leonro@nvidia.com
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Mark Zhang <markzhang@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/core/device.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 256d379bba676..de66d7da1bf6e 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -2438,7 +2438,8 @@ int ib_find_gid(struct ib_device *device, union ib_gid *gid,
++i) {
ret = rdma_query_gid(device, port, i, &tmp_gid);
if (ret)
- return ret;
+ continue;
+
if (!memcmp(&tmp_gid, gid, sizeof *gid)) {
*port_num = port;
if (index)
--
2.34.1