cn10k-ipsec: Allow ipsec crypto offload for skb with SA

Allow to use hardware offload for outbound ipsec crypto
mode if security association (SA) is set for a given skb.

Signed-off-by: Bharat Bhushan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Bharat Bhushan

drivers/net/ethernet/marvell/octeontx2/nic/cn10k_ipsec.c

@@ -746,9 +746,24 @@ static void cn10k_ipsec_del_state(struct xfrm_state *x)
 		queue_work(pf->ipsec.sa_workq, &pf->ipsec.sa_work);
 }
 
+static bool cn10k_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
+{
+	if (x->props.family == AF_INET) {
+		/* Offload with IPv4 options is not supported yet */
+		if (ip_hdr(skb)->ihl > 5)
+			return false;
+	} else {
+		/* Offload with IPv6 extension headers is not support yet */
+		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
+			return false;
+	}
+	return true;
+}
+
 static const struct xfrmdev_ops cn10k_ipsec_xfrmdev_ops = {
 	.xdo_dev_state_add	= cn10k_ipsec_add_state,
 	.xdo_dev_state_delete	= cn10k_ipsec_del_state,
+	.xdo_dev_offload_ok	= cn10k_ipsec_offload_ok,
 };
 
 static void cn10k_ipsec_sa_wq_handler(struct work_struct *work)