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IB/mlx4: Report TSO capabilities 

Report to the user area the TSO device capabilities, it includes the
max_tso size and the QP types that support it.

The TSO is applicable only when when of the ports is ETH and the device
supports it.

uresp logic around rss_caps is updated to fix a till-now harmless bug
computing the length of the structure to copy. The code did not handle the
implicit padding before rss_caps correctly. This is necessay to copy
tss_caps successfully.

Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
hifive-unleashed-5.1
Yishai Hadas 2018-03-15 16:56:39 +02:00 committed by Jason Gunthorpe
parent 546b1452fd
commit 9c71172c4a
2 changed files with 29 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/infiniband/hw/mlx4/main.c
View File

@ -429,6 +429,9 @@ int mlx4_ib_gid_index_to_real_index(struct mlx4_ib_dev *ibdev,
return real_index;
}
#define field_avail(type, fld, sz) (offsetof(type, fld) + \
sizeof(((type *)0)->fld) <= (sz))
static int mlx4_ib_query_device(struct ib_device *ibdev,
struct ib_device_attr *props,
struct ib_udata *uhw)
@ -587,8 +590,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
sizeof(struct mlx4_wqe_data_seg);
}
if (uhw->outlen >= resp.response_length + sizeof(resp.rss_caps)) {
resp.response_length += sizeof(resp.rss_caps);
if (field_avail(typeof(resp), rss_caps, uhw->outlen)) {
if (props->rss_caps.supported_qpts) {
resp.rss_caps.rx_hash_function =
MLX4_IB_RX_HASH_FUNC_TOEPLITZ;
@ -608,6 +610,22 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
resp.rss_caps.rx_hash_fields_mask |=
MLX4_IB_RX_HASH_INNER;
}
resp.response_length = offsetof(typeof(resp), rss_caps) +
sizeof(resp.rss_caps);
}
if (field_avail(typeof(resp), tso_caps, uhw->outlen)) {
if (dev->dev->caps.max_gso_sz &&
((mlx4_ib_port_link_layer(ibdev, 1) ==
IB_LINK_LAYER_ETHERNET) ||
(mlx4_ib_port_link_layer(ibdev, 2) ==
IB_LINK_LAYER_ETHERNET))) {
resp.tso_caps.max_tso = dev->dev->caps.max_gso_sz;
resp.tso_caps.supported_qpts |=
1 << IB_QPT_RAW_PACKET;
}
resp.response_length = offsetof(typeof(resp), tso_caps) +
sizeof(resp.tso_caps);
}
if (uhw->outlen) {

9
include/uapi/rdma/mlx4-abi.h
View File

@ -170,12 +170,21 @@ enum query_device_resp_mask {
MLX4_IB_QUERY_DEV_RESP_MASK_CORE_CLOCK_OFFSET = 1UL << 0,
};
struct mlx4_ib_tso_caps {
__u32 max_tso; /* Maximum tso payload size in bytes */
/* Corresponding bit will be set if qp type from
* 'enum ib_qp_type' is supported.
*/
__u32 supported_qpts;
};
struct mlx4_uverbs_ex_query_device_resp {
__u32 comp_mask;
__u32 response_length;
__u64 hca_core_clock_offset;
__u32 max_inl_recv_sz;
struct mlx4_ib_rss_caps rss_caps;
struct mlx4_ib_tso_caps tso_caps;
};
#endif /* MLX4_ABI_USER_H */