net/mlx4_en: Don't reassign port mac address on firmware that supports it

Mac reassignments should only be done when not supported by the firmware. To
accomplish that, checking firmware capability bit to know whether we should
reassign macs in the driver.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 333a7a0b833c..7b513e9aea85 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1285,7 +1285,8 @@ void mlx4_en_stop_port(struct net_device *dev)
 
         /* Unregister Mac address for the port */
         mlx4_put_eth_qp(mdev->dev, priv->port, priv->mac, priv->base_qpn);
-        mdev->mac_removed[priv->port] = 1;
+        if (!(mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAGS2_REASSIGN_MAC_EN))
+                mdev->mac_removed[priv->port] = 1;
 
         /* Remove flow steering rules for the port*/
         if (mdev->dev->caps.steering_mode ==
diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index 91acf71aca97..38b62c78d5da 100644
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -127,7 +127,8 @@ static void dump_dev_cap_flags2(struct mlx4_dev *dev, u64 flags)
                 [0] = "RSS support",
                 [1] = "RSS Toeplitz Hash Function support",
                 [2] = "RSS XOR Hash Function support",
-                [3] = "Device manage flow steering support"
+                [3] = "Device manage flow steering support",
+                [4] = "Automatic mac reassignment support"
         };
         int i;
 
@@ -478,6 +479,7 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 #define QUERY_DEV_CAP_BMME_FLAGS_OFFSET         0x94
 #define QUERY_DEV_CAP_RSVD_LKEY_OFFSET          0x98
 #define QUERY_DEV_CAP_MAX_ICM_SZ_OFFSET         0xa0
+#define QUERY_DEV_CAP_FW_REASSIGN_MAC           0x9d
 
         dev_cap->flags2 = 0;
         mailbox = mlx4_alloc_cmd_mailbox(dev);
@@ -637,6 +639,9 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
                  QUERY_DEV_CAP_BMME_FLAGS_OFFSET);
         MLX4_GET(dev_cap->reserved_lkey, outbox,
                  QUERY_DEV_CAP_RSVD_LKEY_OFFSET);
+        MLX4_GET(field, outbox, QUERY_DEV_CAP_FW_REASSIGN_MAC);
+        if (field & 1<<6)
+                dev_cap->flags2 |= MLX4_DEV_CAP_FLAGS2_REASSIGN_MAC_EN;
         MLX4_GET(dev_cap->max_icm_sz, outbox,
                  QUERY_DEV_CAP_MAX_ICM_SZ_OFFSET);
         if (dev_cap->flags & MLX4_DEV_CAP_FLAG_COUNTERS)