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IB/mlx5: Advertise atomic capabilities in query device

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In order to ensure IB spec atomic correctness in atomic operations, if
HW is configured to host endianness, advertise IB_ATOMIC_HCA.  if not,
advertise IB_ATOMIC_NONE.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Eran Ben Elisha 2015-12-14 16:34:10 +02:00 committed by Doug Ledford
parent f91e6d8941
commit da7525d2a9
2 changed files with 32 additions and 1 deletions
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28
drivers/infiniband/hw/mlx5/main.c
View File

@ -65,6 +65,10 @@ static char mlx5_version[] =
DRIVER_NAME ": Mellanox Connect-IB Infiniband driver v"
DRIVER_VERSION " (" DRIVER_RELDATE ")\n";
enum {
MLX5_ATOMIC_SIZE_QP_8BYTES = 1 << 3,
};
static enum rdma_link_layer
mlx5_port_type_cap_to_rdma_ll(int port_type_cap)
{
@ -296,6 +300,28 @@ static int mlx5_get_vport_access_method(struct ib_device *ibdev)
return MLX5_VPORT_ACCESS_METHOD_HCA;
}
static void get_atomic_caps(struct mlx5_ib_dev *dev,
struct ib_device_attr *props)
{
u8 tmp;
u8 atomic_operations = MLX5_CAP_ATOMIC(dev->mdev, atomic_operations);
u8 atomic_size_qp = MLX5_CAP_ATOMIC(dev->mdev, atomic_size_qp);
u8 atomic_req_8B_endianness_mode =
MLX5_CAP_ATOMIC(dev->mdev, atomic_req_8B_endianess_mode);
/* Check if HW supports 8 bytes standard atomic operations and capable
* of host endianness respond
*/
tmp = MLX5_ATOMIC_OPS_CMP_SWAP | MLX5_ATOMIC_OPS_FETCH_ADD;
if (((atomic_operations & tmp) == tmp) &&
(atomic_size_qp & MLX5_ATOMIC_SIZE_QP_8BYTES) &&
(atomic_req_8B_endianness_mode)) {
props->atomic_cap = IB_ATOMIC_HCA;
} else {
props->atomic_cap = IB_ATOMIC_NONE;
}
}
static int mlx5_query_system_image_guid(struct ib_device *ibdev,
__be64 *sys_image_guid)
{
@ -496,7 +522,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
props->max_res_rd_atom = props->max_qp_rd_atom * props->max_qp;
props->max_srq_sge = max_rq_sg - 1;
props->max_fast_reg_page_list_len = (unsigned int)-1;
props->atomic_cap = IB_ATOMIC_NONE;
get_atomic_caps(dev, props);
props->masked_atomic_cap = IB_ATOMIC_NONE;
props->max_mcast_grp = 1 << MLX5_CAP_GEN(mdev, log_max_mcg);
props->max_mcast_qp_attach = MLX5_CAP_GEN(mdev, max_qp_mcg);

5
include/linux/mlx5/driver.h
View File

@ -115,6 +115,11 @@ enum {
MLX5_REG_HOST_ENDIANNESS = 0x7004,
};
enum {
MLX5_ATOMIC_OPS_CMP_SWAP = 1 << 0,
MLX5_ATOMIC_OPS_FETCH_ADD = 1 << 1,
};
enum mlx5_page_fault_resume_flags {
MLX5_PAGE_FAULT_RESUME_REQUESTOR = 1 << 0,
MLX5_PAGE_FAULT_RESUME_WRITE = 1 << 1,