[RFC ipsec-next] xfrm: interface: enable TSO on xfrm interfaces

[Eyal Birger]

Underlying xfrm output supports gso packets.
Declare support in hw_features and adapt the xmit MTU check to pass GSO
packets.

Signed-off-by: Eyal Birger <eyal.bir...@gmail.com>
---
 net/xfrm/xfrm_interface.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index 9b8e292a7c6a..d28e9f05d9dd 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -296,7 +296,8 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, 
struct flowi *fl)
        }
 
        mtu = dst_mtu(dst);
-       if (skb->len > mtu) {
+       if ((!skb_is_gso(skb) && skb->len > mtu) ||
+           (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) {
                skb_dst_update_pmtu_no_confirm(skb, mtu);
 
                if (skb->protocol == htons(ETH_P_IPV6)) {
@@ -579,6 +580,11 @@ static void xfrmi_dev_setup(struct net_device *dev)
        eth_broadcast_addr(dev->broadcast);
 }
 
+#define XFRMI_FEATURES (NETIF_F_SG |           \
+                       NETIF_F_FRAGLIST |      \
+                       NETIF_F_GSO_SOFTWARE |  \
+                       NETIF_F_HW_CSUM)
+
 static int xfrmi_dev_init(struct net_device *dev)
 {
        struct xfrm_if *xi = netdev_priv(dev);
@@ -596,6 +602,8 @@ static int xfrmi_dev_init(struct net_device *dev)
        }
 
        dev->features |= NETIF_F_LLTX;
+       dev->features |= XFRMI_FEATURES;
+       dev->hw_features |= XFRMI_FEATURES;
 
        if (phydev) {
                dev->needed_headroom = phydev->needed_headroom;
-- 
2.25.1