net/mlx4_en: Support for configurable RSS hash function

The ConnectX HW is capable of using one of the following hash functions:
Toeplitz and an XOR hash function. This patch extends the implementation
of the mlx4_en driver set/get_rxfh callbacks to support getting and
setting the RSS hash function used by the device.

Signed-off-by: Eyal Perry <eyalpe@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 1597fb07576c..dccf0e1f86be 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2608,6 +2608,17 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
         if (mdev->dev->caps.steering_mode != MLX4_STEERING_MODE_A0)
                 dev->priv_flags |= IFF_UNICAST_FLT;
 
+        /* Setting a default hash function value */
+        if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_TOP) {
+                priv->rss_hash_fn = ETH_RSS_HASH_TOP;
+        } else if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_XOR) {
+                priv->rss_hash_fn = ETH_RSS_HASH_XOR;
+        } else {
+                en_warn(priv,
+                        "No RSS hash capabilities exposed, using Toeplitz\n");
+                priv->rss_hash_fn = ETH_RSS_HASH_TOP;
+        }
+
         mdev->pndev[port] = dev;
 
         netif_carrier_off(dev);