ndo_gso_check() was recently introduced to allow NICs to report the
offloading support that they have on a per-skb basis. Add an
implementation for this driver which checks for IPIP, GRE, UDP tunnels.
Signed-off-by: Joe Stringer <joestrin...@nicira.com>
---
v3: Drop IPIP and GRE (no driver support even though hw supports it).
Check for UDP outer protocol for UDP tunnels.
v2: Expand to include IP in IP and IPv4/IPv6 inside GRE/UDP tunnels.
Add MAX_INNER_LENGTH (as 80).
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c
b/drivers/net/ethernet/intel/i40e/i40e_main.c
index c3a7f4a..0d6493a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -7447,6 +7447,31 @@ static int i40e_ndo_fdb_dump(struct sk_buff *skb,
#endif /* USE_DEFAULT_FDB_DEL_DUMP */
#endif /* HAVE_FDB_OPS */
+static bool i40e_gso_check(struct sk_buff *skb, struct net_device *dev)
+{
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) {
+ unsigned char *ihdr;
+
+ if (skb->protocol != IPPROTO_UDP ||
+ skb->inner_protocol_type != ENCAP_TYPE_ETHER)
+ return false;
+
+ if (skb->inner_protocol == htons(ETH_P_TEB))
+ ihdr = skb_inner_mac_header(skb);
+ else if (skb->inner_protocol == htons(ETH_P_IP) ||
+ skb->inner_protocol == htons(ETH_P_IPV6))
+ ihdr = skb_inner_network_header(skb);
+ else
+ return false;
+
+#define MAX_TUNNEL_HDR_LEN 80
+ if (ihdr - skb_transport_header(skb) > MAX_TUNNEL_HDR_LEN)
+ return false;
+ }
+
+ return true;
+}
+
static const struct net_device_ops i40e_netdev_ops = {
.ndo_open = i40e_open,
.ndo_stop = i40e_close,
@@ -7487,6 +7512,7 @@ static const struct net_device_ops i40e_netdev_ops = {
.ndo_fdb_dump = i40e_ndo_fdb_dump,
#endif
#endif
+ .ndo_gso_check = i40e_gso_check,
};
/**
--
1.7.10.4
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