From: Guy Levi guyle@mellanox.com
[ Upstream commit 7249c8ea227a582c14f63e9e8853eb7369122f10 ]
When scatter to CQE is enabled on a DCT QP it corrupts the mailbox command since it tried to treat it as as QP create mailbox command instead of a DCT create command.
The corrupted mailbox command causes userspace to malfunction as the device doesn't create the QP as expected.
A new mlx5 capability is exposed to user-space which ensures that it will not enable the feature on DCT without this fix in the kernel.
Fixes: 5d6ff1babe78 ("IB/mlx5: Support scatter to CQE for DC transport type") Signed-off-by: Guy Levi guyle@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/main.c | 2 ++ drivers/infiniband/hw/mlx5/qp.c | 11 +++++++---- include/uapi/rdma/mlx5-abi.h | 1 + 3 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 497181f5ba09..c6bdd0d16c4b 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1025,6 +1025,8 @@ static int mlx5_ib_query_device(struct ib_device *ibdev, if (MLX5_CAP_GEN(mdev, qp_packet_based)) resp.flags |= MLX5_IB_QUERY_DEV_RESP_PACKET_BASED_CREDIT_MODE; + + resp.flags |= MLX5_IB_QUERY_DEV_RESP_FLAGS_SCAT2CQE_DCT; }
if (field_avail(typeof(resp), sw_parsing_caps, diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c index 7db778d96ef5..afc88e6e172e 100644 --- a/drivers/infiniband/hw/mlx5/qp.c +++ b/drivers/infiniband/hw/mlx5/qp.c @@ -1724,13 +1724,16 @@ static void configure_responder_scat_cqe(struct ib_qp_init_attr *init_attr,
rcqe_sz = mlx5_ib_get_cqe_size(init_attr->recv_cq);
- if (rcqe_sz == 128) { - MLX5_SET(qpc, qpc, cs_res, MLX5_RES_SCAT_DATA64_CQE); + if (init_attr->qp_type == MLX5_IB_QPT_DCT) { + if (rcqe_sz == 128) + MLX5_SET(dctc, qpc, cs_res, MLX5_RES_SCAT_DATA64_CQE); + return; }
- if (init_attr->qp_type != MLX5_IB_QPT_DCT) - MLX5_SET(qpc, qpc, cs_res, MLX5_RES_SCAT_DATA32_CQE); + MLX5_SET(qpc, qpc, cs_res, + rcqe_sz == 128 ? MLX5_RES_SCAT_DATA64_CQE : + MLX5_RES_SCAT_DATA32_CQE); }
static void configure_requester_scat_cqe(struct mlx5_ib_dev *dev, diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h index 87b3198f4b5d..f4d4010b7e3e 100644 --- a/include/uapi/rdma/mlx5-abi.h +++ b/include/uapi/rdma/mlx5-abi.h @@ -238,6 +238,7 @@ enum mlx5_ib_query_dev_resp_flags { MLX5_IB_QUERY_DEV_RESP_FLAGS_CQE_128B_COMP = 1 << 0, MLX5_IB_QUERY_DEV_RESP_FLAGS_CQE_128B_PAD = 1 << 1, MLX5_IB_QUERY_DEV_RESP_PACKET_BASED_CREDIT_MODE = 1 << 2, + MLX5_IB_QUERY_DEV_RESP_FLAGS_SCAT2CQE_DCT = 1 << 3, };
enum mlx5_ib_tunnel_offloads {