vxlan: Add capability of Rx checksum offload for inner packet
This patch adds capability in vxlan to identify received
checksummed inner packets and signal them to the upper layers of
the stack. The driver needs to set the skb->encapsulation bit
and also set the skb->ip_summed to CHECKSUM_UNNECESSARY.
Signed-off-by: Joseph Gasparakis <joseph.gasparakis@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 88b31f2..3b3fdf6 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -607,7 +607,17 @@
__skb_tunnel_rx(skb, vxlan->dev);
skb_reset_network_header(skb);
- skb->ip_summed = CHECKSUM_NONE;
+
+ /* If the NIC driver gave us an encapsulated packet with
+ * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
+ * leave the CHECKSUM_UNNECESSARY, the device checksummed it
+ * for us. Otherwise force the upper layers to verify it.
+ */
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
+ !(vxlan->dev->features & NETIF_F_RXCSUM))
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb->encapsulation = 0;
err = IP_ECN_decapsulate(oip, skb);
if (unlikely(err)) {
@@ -1175,7 +1185,9 @@
dev->features |= NETIF_F_LLTX;
dev->features |= NETIF_F_NETNS_LOCAL;
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
- dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+ dev->features |= NETIF_F_RXCSUM;
+
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
spin_lock_init(&vxlan->hash_lock);