igb: add support of RX network flow classification

This patch is meant to allow for RX network flow classification to insert
and remove Rx filter by ethtool. Ethtool interface has it's own rules
manager

Show all filters:
$ ethtool -n eth0
4 RX rings available
Total 2 rules

Signed-off-by: Ruhao Gao <ruhao.gao@ni.com>
Signed-off-by: Gangfeng Huang <gangfeng.huang@ni.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 942a89fb0090..af75eac5fa16 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -176,6 +176,8 @@ static int igb_ndo_set_vf_spoofchk(struct net_device *netdev, int vf,
 static int igb_ndo_get_vf_config(struct net_device *netdev, int vf,
                                  struct ifla_vf_info *ivi);
 static void igb_check_vf_rate_limit(struct igb_adapter *);
+static void igb_nfc_filter_exit(struct igb_adapter *adapter);
+static void igb_nfc_filter_restore(struct igb_adapter *adapter);
 
 #ifdef CONFIG_PCI_IOV
 static int igb_vf_configure(struct igb_adapter *adapter, int vf);
@@ -1611,6 +1613,7 @@ static void igb_configure(struct igb_adapter *adapter)
         igb_setup_mrqc(adapter);
         igb_setup_rctl(adapter);
 
+        igb_nfc_filter_restore(adapter);
         igb_configure_tx(adapter);
         igb_configure_rx(adapter);
 
@@ -2059,6 +2062,21 @@ static int igb_set_features(struct net_device *netdev,
         if (!(changed & (NETIF_F_RXALL | NETIF_F_NTUPLE)))
                 return 0;
 
+        if (!(features & NETIF_F_NTUPLE)) {
+                struct hlist_node *node2;
+                struct igb_nfc_filter *rule;
+
+                spin_lock(&adapter->nfc_lock);
+                hlist_for_each_entry_safe(rule, node2,
+                                          &adapter->nfc_filter_list, nfc_node) {
+                        igb_erase_filter(adapter, rule);
+                        hlist_del(&rule->nfc_node);
+                        kfree(rule);
+                }
+                spin_unlock(&adapter->nfc_lock);
+                adapter->nfc_filter_count = 0;
+        }
+
         netdev->features = features;
 
         if (netif_running(netdev))
@@ -3053,6 +3071,7 @@ static int igb_sw_init(struct igb_adapter *adapter)
                                   VLAN_HLEN;
         adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
 
+        spin_lock_init(&adapter->nfc_lock);
         spin_lock_init(&adapter->stats64_lock);
 #ifdef CONFIG_PCI_IOV
         switch (hw->mac.type) {
@@ -3240,6 +3259,8 @@ static int __igb_close(struct net_device *netdev, bool suspending)
         igb_down(adapter);
         igb_free_irq(adapter);
 
+        igb_nfc_filter_exit(adapter);
+
         igb_free_all_tx_resources(adapter);
         igb_free_all_rx_resources(adapter);
 
@@ -8306,4 +8327,28 @@ int igb_reinit_queues(struct igb_adapter *adapter)
 
         return err;
 }
+
+static void igb_nfc_filter_exit(struct igb_adapter *adapter)
+{
+        struct igb_nfc_filter *rule;
+
+        spin_lock(&adapter->nfc_lock);
+
+        hlist_for_each_entry(rule, &adapter->nfc_filter_list, nfc_node)
+                igb_erase_filter(adapter, rule);
+
+        spin_unlock(&adapter->nfc_lock);
+}
+
+static void igb_nfc_filter_restore(struct igb_adapter *adapter)
+{
+        struct igb_nfc_filter *rule;
+
+        spin_lock(&adapter->nfc_lock);
+
+        hlist_for_each_entry(rule, &adapter->nfc_filter_list, nfc_node)
+                igb_add_filter(adapter, rule);
+
+        spin_unlock(&adapter->nfc_lock);
+}
 /* igb_main.c */