net/mlx5e: Modify TIRs hash only when it's needed
[sfrench/cifs-2.6.git] / drivers / net / ethernet / mellanox / mlx5 / core / en_ethtool.c
index ffbdf9ee5a9b905ee885a76302119f1a9c1d46ce..6f4eb34259f01cbfa5a4c3fba0473607f6314499 100644 (file)
@@ -996,6 +996,7 @@ static int mlx5e_set_rxfh(struct net_device *dev, const u32 *indir,
 {
        struct mlx5e_priv *priv = netdev_priv(dev);
        int inlen = MLX5_ST_SZ_BYTES(modify_tir_in);
+       bool hash_changed = false;
        void *in;
 
        if ((hfunc != ETH_RSS_HASH_NO_CHANGE) &&
@@ -1017,14 +1018,21 @@ static int mlx5e_set_rxfh(struct net_device *dev, const u32 *indir,
                mlx5e_redirect_rqt(priv, rqtn, MLX5E_INDIR_RQT_SIZE, 0);
        }
 
-       if (key)
+       if (hfunc != ETH_RSS_HASH_NO_CHANGE &&
+           hfunc != priv->params.rss_hfunc) {
+               priv->params.rss_hfunc = hfunc;
+               hash_changed = true;
+       }
+
+       if (key) {
                memcpy(priv->params.toeplitz_hash_key, key,
                       sizeof(priv->params.toeplitz_hash_key));
+               hash_changed = hash_changed ||
+                              priv->params.rss_hfunc == ETH_RSS_HASH_TOP;
+       }
 
-       if (hfunc != ETH_RSS_HASH_NO_CHANGE)
-               priv->params.rss_hfunc = hfunc;
-
-       mlx5e_modify_tirs_hash(priv, in, inlen);
+       if (hash_changed)
+               mlx5e_modify_tirs_hash(priv, in, inlen);
 
        mutex_unlock(&priv->state_lock);