RDMA/core: Rate limit GID cache warning messages

The GID cache warning messages can flood the kernel log when there are
multiple failed attempts to add GIDs. This can happen when creating many
virtual interfaces without having enough space for their GIDs in the GID
table.

Change pr_warn to pr_warn_ratelimited to prevent log flooding while still
maintaining visibility of the issue.

Link: https://patch.msgid.link/r/fd45ed4a1078e743f498b234c3ae816610ba1b18.1750062357.git.leon@kernel.org
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/cache.c

@@ -582,8 +582,8 @@ static int __ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
 out_unlock:
 	mutex_unlock(&table->lock);
 	if (ret)
-		pr_warn("%s: unable to add gid %pI6 error=%d\n",
-			__func__, gid->raw, ret);
+		pr_warn_ratelimited("%s: unable to add gid %pI6 error=%d\n",
+				    __func__, gid->raw, ret);
 	return ret;
 }