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ip6gre: Add support for basic offloads offloads excluding GSO

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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>
This commit is contained in:
Alexander Duyck 2016-04-14 15:33:51 -04:00 committed by David S. Miller
parent a9e242ca43
commit ac4eb009e4
1 changed files with 21 additions and 2 deletions
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23
net/ipv6/ip6_gre.c
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@ -598,6 +598,18 @@ static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
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 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
}
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 @@ static const struct net_device_ops ip6gre_tap_netdev_ops = {
.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 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
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;