xfrm: Prepare the GRO codepath for hardware offloading.

On IPsec hardware offloading, we already get a secpath with
valid state attached when the packet enters the GRO handlers.
So check for hardware offload and skip the state lookup in this
case.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

1 files changed, 23 insertions, 19 deletions

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index 1e39564..f3e33c2 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -43,27 +43,31 @@ static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
 	if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
 		goto out;
 
-	err = secpath_set(skb);
-	if (err)
-		goto out;
-
-	if (skb->sp->len == XFRM_MAX_DEPTH)
-		goto out;
-
-	x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
-			      (xfrm_address_t *)&ip_hdr(skb)->daddr,
-			      spi, IPPROTO_ESP, AF_INET);
-	if (!x)
-		goto out;
-
-	skb->sp->xvec[skb->sp->len++] = x;
-	skb->sp->olen++;
-
 	xo = xfrm_offload(skb);
-	if (!xo) {
-		xfrm_state_put(x);
-		goto out;
+	if (!xo || !(xo->flags & CRYPTO_DONE)) {
+		err = secpath_set(skb);
+		if (err)
+			goto out;
+
+		if (skb->sp->len == XFRM_MAX_DEPTH)
+			goto out;
+
+		x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
+				      (xfrm_address_t *)&ip_hdr(skb)->daddr,
+				      spi, IPPROTO_ESP, AF_INET);
+		if (!x)
+			goto out;
+
+		skb->sp->xvec[skb->sp->len++] = x;
+		skb->sp->olen++;
+
+		xo = xfrm_offload(skb);
+		if (!xo) {
+			xfrm_state_put(x);
+			goto out;
+		}
 	}
+
 	xo->flags |= XFRM_GRO;
 
 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;