[PATCH 5.19 379/717] RDMA/mlx5: Dont compare mkey tags in DEVX indirect mkey

Greg Kroah-Hartman
2022-10-22T08:36:04Z

From: Aharon Landau <aharonl@nvidia.com>

[ Upstream commit 13ad1125b941a5f257d9d3ae70485773abd34792 ]

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 <aharonl@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/mlx5/main.c | 3 +++
drivers/infiniband/hw/mlx5/odp.c | 3 ++-
include/uapi/rdma/mlx5-abi.h | 1 +
3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index bb13164124fd..aa4a2a9cb0d5 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1826,6 +1826,9 @@ static int set_ucontext_resp(struct ib_ucontext *uctx,
if (MLX5_CAP_GEN(dev->mdev, drain_sigerr))
resp->comp_mask |= MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_SQD2RTS;

+ resp->comp_mask |=
+ MLX5_IB_ALLOC_UCONTEXT_RESP_MASK_MKEY_UPDATE_TAG;
+
return 0;
}

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 84da5674e1ab..9151852f04a1 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -795,7 +795,8 @@ static bool mkey_is_eq(struct mlx5_ib_mkey *mmkey, u32 key)
{
if (!mmkey)
return false;
- if (mmkey->type == MLX5_MKEY_MW)
+ if (mmkey->type == MLX5_MKEY_MW ||
+ mmkey->type == MLX5_MKEY_INDIRECT_DEVX)
return mlx5_base_mkey(mmkey->key) == mlx5_base_mkey(key);
return mmkey->key == key;
}
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 {
--
2.35.1