MLX4_EN_MAC_HASH_IDX
bucket = &priv->mac_hash[ha->addr[MLX4_EN_MAC_HASH_IDX]];
mac_hash = ha->addr[MLX4_EN_MAC_HASH_IDX];
&priv->mac_hash[entry->mac[MLX4_EN_MAC_HASH_IDX]]);
bucket = &priv->mac_hash[prev_mac[MLX4_EN_MAC_HASH_IDX]];
mac_hash = new_mac[MLX4_EN_MAC_HASH_IDX];
mac_hash = ethh->h_source[MLX4_EN_MAC_HASH_IDX];