net/mlx4: Set steering mode according to device capabilities

Instead of checking the firmware supported steering mode in various
places in the code, add a dedicated field in the mlx4 device capabilities
structure which is written once during the initialization flow and read
across the code.

This also set the grounds for add new steering modes. Currently two modes
are supported, and are named after the ConnectX HW versions A0 and B0.

A0 steering uses mac_index, vlan_index and priority to steer traffic
into pre-defined range of QPs.

B0 steering uses Ethernet L2 hashing rules and is enabled only
if the firmware supports both unicast and multicast B0 steering,

The current steering modes are relevant for Ethernet traffic only,
such that Infiniband steering remains untouched.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 0 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 6a8f002b8ed3..7f5c9ee42f96 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -70,6 +70,29 @@ enum {
         MLX4_MFUNC_EQE_MASK     = (MLX4_MFUNC_MAX_EQES - 1)
 };
 
+/* Driver supports 2 diffrent device methods to manage traffic steering:
+ *      - B0 steering mode - Common low level API for ib and (if supported) eth.
+ *      - A0 steering mode - Limited low level API for eth. In case of IB,
+ *                           B0 mode is in use.
+ */
+enum {
+        MLX4_STEERING_MODE_A0,
+        MLX4_STEERING_MODE_B0
+};
+
+static inline const char *mlx4_steering_mode_str(int steering_mode)
+{
+        switch (steering_mode) {
+        case MLX4_STEERING_MODE_A0:
+                return "A0 steering";
+
+        case MLX4_STEERING_MODE_B0:
+                return "B0 steering";
+        default:
+                return "Unrecognize steering mode";
+        }
+}
+
 enum {
         MLX4_DEV_CAP_FLAG_RC            = 1LL <<  0,
         MLX4_DEV_CAP_FLAG_UC            = 1LL <<  1,
@@ -295,6 +318,7 @@ struct mlx4_caps {
         int                     num_amgms;
         int                     reserved_mcgs;
         int                     num_qp_per_mgm;
+        int                     steering_mode;
         int                     num_pds;
         int                     reserved_pds;
         int                     max_xrcds;