From 13ad1125b941a5f257d9d3ae70485773abd34792 Mon Sep 17 00:00:00 2001 From: Aharon Landau Date: Sun, 31 Jul 2022 11:26:36 +0300 Subject: RDMA/mlx5: Don't compare mkey tags in DEVX indirect mkey According to the ib spec: If the CI supports the Base Memory Management Extensions defined in this specification, the L_Key format must consist of: 24 bit index in the most significant bits of the R_Key, and 8 bit key in the least significant bits of the R_Key Through a successful Allocate L_Key verb invocation, the CI must let the consumer own the key portion of the returned R_Key Therefore, when creating a mkey using DEVX, the consumer is allowed to change the key part. The kernel should compare only the index part of a R_Key to determine equality with another R_Key. Adding capability in order not to break backward compatibility. Fixes: 534fd7aac56a ("IB/mlx5: Manage indirection mkey upon DEVX flow for ODP") Link: https://lore.kernel.org/r/3d669aacea85a3a15c3b3b953b3eaba3f80ef9be.1659255945.git.leonro@nvidia.com Signed-off-by: Aharon Landau Signed-off-by: Leon Romanovsky --- include/uapi/rdma/mlx5-abi.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/rdma') diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h index 86be4a92b67b..a96b7d2770e1 100644 --- a/include/uapi/rdma/mlx5-abi.h +++ b/include/uapi/rdma/mlx5-abi.h @@ -104,6 +104,7 @@ enum mlx5_ib_alloc_ucontext_resp_mask { MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_ECE = 1UL << 2, MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_SQD2RTS = 1UL << 3, MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_REAL_TIME_TS = 1UL << 4, + MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_MKEY_UPDATE_TAG = 1UL << 5, }; enum mlx5_user_cmds_supp_uhw { -- cgit v1.2.3