From 20679094a0161c94faf77e373fa3f7428a8e14bd Mon Sep 17 00:00:00 2001
From: Avihai Horon <avihaih@nvidia.com>
Date: Thu, 9 Dec 2021 15:16:07 +0200
Subject: [PATCH 1/1] RDMA/cma: Let cma_resolve_ib_dev() continue search even
after empty entry
Git-commit: 20679094a0161c94faf77e373fa3f7428a8e14bd
Patch-mainline: v5.17
References: git-fixes
Currently, when cma_resolve_ib_dev() searches for a matching GID it 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 the matching valid GID entry exists at index N, and if a
GID entry is empty at index N-1, cma_resolve_ib_dev() will fail to find
the matching valid entry.
Fix it by making cma_resolve_ib_dev() continue searching even after
encountering missing entries.
Fixes: f17df3b0dede ("RDMA/cma: Add support for AF_IB to rdma_resolve_addr()")
Link: https://lore.kernel.org/r/b7346307e3bb396c43d67d924348c6c496493991.1639055490.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>
Acked-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
---
drivers/infiniband/core/cma.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 8a98aa90956f..27a00ce2e101 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -813,6 +813,7 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
u16 pkey, index;
u8 p;
enum ib_port_state port_state;
+ int ret;
int i;
cma_dev = NULL;
@@ -831,9 +832,14 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
continue;
- for (i = 0; !rdma_query_gid(cur_dev->device,
- p, i, &gid);
- i++) {
+
+ for (i = 0; i < cur_dev->device->port_immutable[p].gid_tbl_len;
+ ++i) {
+ ret = rdma_query_gid(cur_dev->device, p, i,
+ &gid);
+ if (ret)
+ continue;
+
if (!memcmp(&gid, dgid, sizeof(gid))) {
cma_dev = cur_dev;
sgid = gid;
--
2.35.0