net/mlx4_core: Use firmware driven flow steering hash mode

The Firmware dynamically changes flow steering hash configuration from covering
L2 only to "full" L2/L3/L4 mode needed.  The dynamic change allows the driver
to set hard coded hash configuration which is changed by the firmware from L2
to L2/L3/L4 when attaching the first L3/L4 flow steering rule and back to L2
when there are no more such rules.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/fw.c

@@ -1287,14 +1287,14 @@ int mlx4_INIT_HCA(struct mlx4_dev *dev, struct mlx4_init_hca_param *param)
 		/* Enable Ethernet flow steering
 		 * with udp unicast and tcp unicast
 		 */
-		MLX4_PUT(inbox, param->fs_hash_enable_bits,
+		MLX4_PUT(inbox, (u8) (MLX4_FS_UDP_UC_EN | MLX4_FS_TCP_UC_EN),
 			 INIT_HCA_FS_ETH_BITS_OFFSET);
 		MLX4_PUT(inbox, (u16) MLX4_FS_NUM_OF_L2_ADDR,
 			 INIT_HCA_FS_ETH_NUM_ADDRS_OFFSET);
 		/* Enable IPoIB flow steering
 		 * with udp unicast and tcp unicast
 		 */
-		MLX4_PUT(inbox, param->fs_hash_enable_bits,
+		MLX4_PUT(inbox, (u8) (MLX4_FS_UDP_UC_EN | MLX4_FS_TCP_UC_EN),
 			 INIT_HCA_FS_IB_BITS_OFFSET);
 		MLX4_PUT(inbox, (u16) MLX4_FS_NUM_OF_L2_ADDR,
 			 INIT_HCA_FS_IB_NUM_ADDRS_OFFSET);

drivers/net/ethernet/mellanox/mlx4/fw.h

@@ -171,7 +171,6 @@ struct mlx4_init_hca_param {
 	u8  log_mpt_sz;
 	u8  log_uar_sz;
 	u8  uar_page_sz; /* log pg sz in 4k chunks */
-	u8  fs_hash_enable_bits;
 	u8  steering_mode; /* for QUERY_HCA */
 	u64 dev_cap_enabled;
 };

drivers/net/ethernet/mellanox/mlx4/main.c

@@ -1415,22 +1415,6 @@ static int mlx4_init_hca(struct mlx4_dev *dev)
 		if (mlx4_is_master(dev))
 			mlx4_parav_master_pf_caps(dev);
 
-		priv->fs_hash_mode = MLX4_FS_L2_HASH;
-
-		switch (priv->fs_hash_mode) {
-		case MLX4_FS_L2_HASH:
-			init_hca.fs_hash_enable_bits = 0;
-			break;
-
-		case MLX4_FS_L2_L3_L4_HASH:
-			/* Enable flow steering with
-			 * udp unicast and tcp unicast
-			 */
-			init_hca.fs_hash_enable_bits =
-				MLX4_FS_UDP_UC_EN | MLX4_FS_TCP_UC_EN;
-			break;
-		}
-
 		profile = default_profile;
 		if (dev->caps.steering_mode ==
 		    MLX4_STEERING_MODE_DEVICE_MANAGED)

drivers/net/ethernet/mellanox/mlx4/mlx4.h

@@ -60,11 +60,6 @@
 #define MLX4_FS_MGM_LOG_ENTRY_SIZE	7
 #define MLX4_FS_NUM_MCG			(1 << 17)
 
-enum {
-	MLX4_FS_L2_HASH = 0,
-	MLX4_FS_L2_L3_L4_HASH,
-};
-
 #define MLX4_NUM_UP		8
 #define MLX4_NUM_TC		8
 #define MLX4_RATELIMIT_UNITS 3 /* 100 Mbps */