From: Yishai Hadas <yishaih@xxxxxxxxxxxx>
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.
Reviewed-by: Mark Bloch <markb@xxxxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
---
drivers/infiniband/hw/mlx4/main.c | 22 ++++++++++++++++++++--
include/uapi/rdma/mlx4-abi.h | 9 +++++++++
2 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index c9eaaa216891..14439eac5979 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -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) {
diff --git a/include/uapi/rdma/mlx4-abi.h b/include/uapi/rdma/mlx4-abi.h
index 6dfe3d0b7399..6a17904c596a 100644
--- a/include/uapi/rdma/mlx4-abi.h
+++ b/include/uapi/rdma/mlx4-abi.h
@@ -162,6 +162,14 @@ struct mlx4_ib_rss_caps {
__u8 reserved[7];
};
+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;
@@ -170,6 +178,7 @@ struct mlx4_uverbs_ex_query_device_resp {
/* Explicitly align the response to u64 */
__u32 reserved;
struct mlx4_ib_rss_caps rss_caps;
+ struct mlx4_ib_tso_caps tso_caps;
};
#endif /* MLX4_ABI_USER_H */
--
2.14.3
--
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