RDMA/mlx5: Relax DEVX access upon modify commands

[ Upstream commit be551ee1574280ef8afbf7c271212ac3e38933ef ]

Relax DEVX access upon modify commands to be UVERBS_ACCESS_READ.

The kernel doesn't need to protect what firmware protects, or what
causes no damage to anyone but the user.

As firmware needs to protect itself from parallel access to the same
object, don't block parallel modify/query commands on the same object in
the kernel side.

This change will allow user space application to run parallel updates to
different entries in the same bulk object.

Tested-by: Tamar Mashiah <tmashiah@nvidia.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://lore.kernel.org/r/7407d5ed35dc427c1097699e12b49c01e1073406.1706433934.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
index a56ebdc15723c7010cc2aae68ca6b69280f79636..f67ebd9f3cdd19fcd00bcb6c6d5bbe5b4e0d44cb 100644 (file)
--- a/drivers/infiniband/hw/mlx5/devx.c
+++ b/drivers/infiniband/hw/mlx5/devx.c
@@ -2780,7 +2780,7 @@ DECLARE_UVERBS_NAMED_METHOD(
        MLX5_IB_METHOD_DEVX_OBJ_MODIFY,
        UVERBS_ATTR_IDR(MLX5_IB_ATTR_DEVX_OBJ_MODIFY_HANDLE,
                        UVERBS_IDR_ANY_OBJECT,
-                       UVERBS_ACCESS_WRITE,
+                       UVERBS_ACCESS_READ,
                        UA_MANDATORY),
        UVERBS_ATTR_PTR_IN(
                MLX5_IB_ATTR_DEVX_OBJ_MODIFY_CMD_IN,