IB/mlx5: Expose RSS related capabilities

Expose RSS related capabilities on both IB and vendor channels.

In addition to the IB capabilities the driver reports some extra
capabilities on its vendor channel:
- Bit mask of the supported types of hash functions.
- Bit mask of the supported RX fields that can participate
  in the RX hashing.

Those capabilities are applicable only when the link layer
is Ethernet.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index cf1eee4..840fbd0 100644 (file)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -531,6 +531,26 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
                                resp.response_length += sizeof(resp.tso_caps);
                        }
                }
+
+               if (field_avail(typeof(resp), rss_caps, uhw->outlen)) {
+                       resp.rss_caps.rx_hash_function =
+                                               MLX5_RX_HASH_FUNC_TOEPLITZ;
+                       resp.rss_caps.rx_hash_fields_mask =
+                                               MLX5_RX_HASH_SRC_IPV4 |
+                                               MLX5_RX_HASH_DST_IPV4 |
+                                               MLX5_RX_HASH_SRC_IPV6 |
+                                               MLX5_RX_HASH_DST_IPV6 |
+                                               MLX5_RX_HASH_SRC_PORT_TCP |
+                                               MLX5_RX_HASH_DST_PORT_TCP |
+                                               MLX5_RX_HASH_SRC_PORT_UDP |
+                                               MLX5_RX_HASH_DST_PORT_UDP;
+                       resp.response_length += sizeof(resp.rss_caps);
+               }
+       } else {
+               if (field_avail(typeof(resp), tso_caps, uhw->outlen))
+                       resp.response_length += sizeof(resp.tso_caps);
+               if (field_avail(typeof(resp), rss_caps, uhw->outlen))
+                       resp.response_length += sizeof(resp.rss_caps);
        }
 
        if (MLX5_CAP_GEN(mdev, ipoib_basic_offloads)) {
@@ -594,6 +614,17 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
        if (!mlx5_core_is_pf(mdev))
                props->device_cap_flags |= IB_DEVICE_VIRTUAL_FUNCTION;
 
+       if (mlx5_ib_port_link_layer(ibdev, 1) ==
+           IB_LINK_LAYER_ETHERNET) {
+               props->rss_caps.max_rwq_indirection_tables =
+                       1 << MLX5_CAP_GEN(dev->mdev, log_max_rqt);
+               props->rss_caps.max_rwq_indirection_table_size =
+                       1 << MLX5_CAP_GEN(dev->mdev, log_max_rqt_size);
+               props->rss_caps.supported_qpts = 1 << IB_QPT_RAW_PACKET;
+               props->max_wq_type_rq =
+                       1 << MLX5_CAP_GEN(dev->mdev, log_max_rq);
+       }
+
        if (uhw->outlen) {
                err = ib_copy_to_udata(uhw, &resp, resp.response_length);
 

diff --git a/drivers/infiniband/hw/mlx5/user.h b/drivers/infiniband/hw/mlx5/user.h
index 188dac4..0e49d5b 100644 (file)
--- a/drivers/infiniband/hw/mlx5/user.h
+++ b/drivers/infiniband/hw/mlx5/user.h
@@ -121,10 +121,17 @@ struct mlx5_ib_tso_caps {
        __u32 supported_qpts;
 };
 
+struct mlx5_ib_rss_caps {
+       __u64 rx_hash_fields_mask; /* enum mlx5_rx_hash_fields */
+       __u8 rx_hash_function; /* enum mlx5_rx_hash_function_flags */
+       __u8 reserved[7];
+};
+
 struct mlx5_ib_query_device_resp {
        __u32   comp_mask;
        __u32   response_length;
        struct  mlx5_ib_tso_caps tso_caps;
+       struct  mlx5_ib_rss_caps rss_caps;
 };
 
 struct mlx5_ib_create_cq {