net/mlx4_en: Fix ethtool rules leftovers after module unloaded

As part of the driver unload flow, all steering rules must be deleted,
make sure to remove the rules that were set through ethtool.

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>

3 files changed, 21 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index 6f8044daec42..738e95d43ccb 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -915,6 +915,7 @@ static int mlx4_en_flow_replace(struct net_device *dev,
                 loc_rule->id = 0;
                 memset(&loc_rule->flow_spec, 0,
                        sizeof(struct ethtool_rx_flow_spec));
+                list_del(&loc_rule->list);
         }
         err = mlx4_flow_attach(priv->mdev->dev, &rule, &reg_id);
         if (err) {
@@ -925,6 +926,7 @@ static int mlx4_en_flow_replace(struct net_device *dev,
         loc_rule->id = reg_id;
         memcpy(&loc_rule->flow_spec, &cmd->fs,
                sizeof(struct ethtool_rx_flow_spec));
+        list_add_tail(&loc_rule->list, &priv->ethtool_list);
 
 out_free_list:
         list_for_each_entry_safe(spec, tmp_spec, &rule.list, list) {
@@ -958,6 +960,7 @@ static int mlx4_en_flow_detach(struct net_device *dev,
         }
         rule->id = 0;
         memset(&rule->flow_spec, 0, sizeof(struct ethtool_rx_flow_spec));
+        list_del(&rule->list);
 out:
         return err;
 
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 9c42812d2f6b..333a7a0b833c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1039,6 +1039,9 @@ int mlx4_en_start_port(struct net_device *dev)
 
         INIT_LIST_HEAD(&priv->mc_list);
         INIT_LIST_HEAD(&priv->curr_list);
+        INIT_LIST_HEAD(&priv->ethtool_list);
+        memset(&priv->ethtool_rules[0], 0,
+               sizeof(struct ethtool_flow_id) * MAX_NUM_OF_FS_RULES);
 
         /* Calculate Rx buf size */
         dev->mtu = min(dev->mtu, priv->max_mtu);
@@ -1202,6 +1205,7 @@ void mlx4_en_stop_port(struct net_device *dev)
         struct mlx4_en_priv *priv = netdev_priv(dev);
         struct mlx4_en_dev *mdev = priv->mdev;
         struct mlx4_en_mc_list *mclist, *tmp;
+        struct ethtool_flow_id *flow, *tmp_flow;
         int i;
         u8 mc_list[16] = {0};
 
@@ -1283,6 +1287,17 @@ void mlx4_en_stop_port(struct net_device *dev)
         mlx4_put_eth_qp(mdev->dev, priv->port, priv->mac, priv->base_qpn);
         mdev->mac_removed[priv->port] = 1;
 
+        /* Remove flow steering rules for the port*/
+        if (mdev->dev->caps.steering_mode ==
+            MLX4_STEERING_MODE_DEVICE_MANAGED) {
+                ASSERT_RTNL();
+                list_for_each_entry_safe(flow, tmp_flow,
+                                         &priv->ethtool_list, list) {
+                        mlx4_flow_detach(mdev->dev, flow->id);
+                        list_del(&flow->list);
+                }
+        }
+
         /* Free RX Rings */
         for (i = 0; i < priv->rx_ring_num; i++) {
                 mlx4_en_deactivate_rx_ring(priv, &priv->rx_ring[i]);
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 8d54412ada63..4fb4a3e3ae8b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -427,6 +427,7 @@ struct mlx4_en_frag_info {
 #endif
 
 struct ethtool_flow_id {
+        struct list_head list;
         struct ethtool_rx_flow_spec flow_spec;
         u64 id;
 };
@@ -441,6 +442,8 @@ struct mlx4_en_priv {
         struct mlx4_en_port_state port_state;
         spinlock_t stats_lock;
         struct ethtool_flow_id ethtool_rules[MAX_NUM_OF_FS_RULES];
+        /* To allow rules removal while port is going down */
+        struct list_head ethtool_list;
 
         unsigned long last_moder_packets[MAX_RX_RINGS];
         unsigned long last_moder_tx_packets;