net/mlx5e: Switch to Toeplitz RSS hash by default

Although XOR hash function can perform very well on some special use
cases, to align with all drivers, mlx5 driver should use Toeplitz hash
by default.
Toeplitz is more stable for the general use case and it is more standard
and reliable.

On top of that, since XOR (MLX5_RX_HASH_FN_INVERTED_XOR8) gives only a
repeated 8 bits pattern. When used for udp tunneling RSS source port
manipulation it results in fixed source port, which will cause bad RSS
spread.

Fixes: 2be6967cdbc9 ("net/mlx5e: Support ETH_RSS_HASH_XOR")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 4187c43b20ada1361794a3f560c97c55ca66e33f..f7eb521db580001f48ee021878f5e8d477ad4dbc 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4564,7 +4564,7 @@ void mlx5e_build_rss_params(struct mlx5e_rss_params *rss_params,
 {
        enum mlx5e_traffic_types tt;
 
-       rss_params->hfunc = ETH_RSS_HASH_XOR;
+       rss_params->hfunc = ETH_RSS_HASH_TOP;
        netdev_rss_key_fill(rss_params->toeplitz_hash_key,
                            sizeof(rss_params->toeplitz_hash_key));
        mlx5e_build_default_indir_rqt(rss_params->indirection_rqt,