ip6gre: Add support for basic offloads offloads excluding GSO
This patch adds support for the basic offloads we support on most devices.
Specifically with this patch set we can support checksum offload, basic
scatter-gather, and highdma.
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 2be66e7..1a5ad14 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -598,6 +598,18 @@
opt->ops.opt_nflen = 8;
}
+static __sum16 gre6_checksum(struct sk_buff *skb)
+{
+ __wsum csum;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ csum = lco_csum(skb);
+ else
+ csum = skb_checksum(skb, sizeof(struct ipv6hdr),
+ skb->len - sizeof(struct ipv6hdr), 0);
+ return csum_fold(csum);
+}
+
static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
struct net_device *dev,
__u8 dsfield,
@@ -750,8 +762,7 @@
}
if (tunnel->parms.o_flags&GRE_CSUM) {
*ptr = 0;
- *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
- skb->len - sizeof(struct ipv6hdr));
+ *(__sum16 *)ptr = gre6_checksum(skb);
}
}
@@ -1507,6 +1518,11 @@
.ndo_get_iflink = ip6_tnl_get_iflink,
};
+#define GRE6_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_HIGHDMA | \
+ NETIF_F_HW_CSUM)
+
static void ip6gre_tap_setup(struct net_device *dev)
{
@@ -1540,6 +1556,9 @@
nt->net = dev_net(dev);
ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
+ dev->features |= GRE6_FEATURES;
+ dev->hw_features |= GRE6_FEATURES;
+
/* Can use a lockless transmit, unless we generate output sequences */
if (!(nt->parms.o_flags & GRE_SEQ))
dev->features |= NETIF_F_LLTX;