ixgbe: add rxhash support

feed RSS hash into skb->rxhash

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Evan Swanson <evan.swanson@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 19 insertions, 2 deletions

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index f2efa3245352..545b231b2a74 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -2253,8 +2253,13 @@ static int ixgbe_set_flags(struct net_device *netdev, u32 data)
         need_reset = (data & ETH_FLAG_RXVLAN) !=
                      (netdev->features & NETIF_F_HW_VLAN_RX);
 
+        if ((data & ETH_FLAG_RXHASH) &&
+            !(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
+                return -EOPNOTSUPP;
+
         rc = ethtool_op_set_flags(netdev, data, ETH_FLAG_LRO | ETH_FLAG_NTUPLE |
-                                        ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN);
+                                  ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN |
+                                  ETH_FLAG_RXHASH);
         if (rc)
                 return rc;
 
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index eebb1921c660..56cc9a10c717 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1063,8 +1063,14 @@ static int __ixgbe_notify_dca(struct device *dev, void *data)
 
         return 0;
 }
-
 #endif /* CONFIG_IXGBE_DCA */
+
+static inline void ixgbe_rx_hash(union ixgbe_adv_rx_desc *rx_desc,
+                                 struct sk_buff *skb)
+{
+        skb->rxhash = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
+}
+
 /**
  * ixgbe_receive_skb - Send a completed packet up the stack
  * @adapter: board private structure
@@ -1456,6 +1462,8 @@ static void ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
                 }
 
                 ixgbe_rx_checksum(adapter, rx_desc, skb);
+                if (adapter->netdev->features & NETIF_F_RXHASH)
+                        ixgbe_rx_hash(rx_desc, skb);
 
                 /* probably a little skewed due to removing CRC */
                 total_rx_bytes += skb->len;
@@ -7361,6 +7369,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
         netdev->features |= NETIF_F_TSO;
         netdev->features |= NETIF_F_TSO6;
         netdev->features |= NETIF_F_GRO;
+        netdev->features |= NETIF_F_RXHASH;
 
         switch (adapter->hw.mac.type) {
         case ixgbe_mac_82599EB:
@@ -7441,6 +7450,9 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
         if (err)
                 goto err_sw_init;
 
+        if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED))
+                netdev->features &= ~NETIF_F_RXHASH;
+
         switch (pdev->device) {
         case IXGBE_DEV_ID_82599_SFP:
                 /* Only this subdevice supports WOL */