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GSO: Add GSO type for fixed IPv4 ID

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This patch adds support for TSO using IPv4 headers with a fixed IP ID
field.  This is meant to allow us to do a lossless GRO in the case of TCP
flows that use a fixed IP ID such as those that convert IPv6 header to IPv4
headers.

In addition I am adding a feature that for now I am referring to TSO with
IP ID mangling.  Basically when this flag is enabled the device has the
option to either output the flow with incrementing IP IDs or with a fixed
IP ID regardless of what the original IP ID ordering was.  This is useful
in cases where the DF bit is set and we do not care if the original IP ID
value is maintained.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2016-04-10 21:44:51 -04:00
committed by David S. Miller
parent 518f213ddd
commit cbc53e08a7
10 changed files with 63 additions and 24 deletions
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34
net/core/dev.c
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@ -2825,14 +2825,36 @@ static netdev_features_t dflt_features_check(const struct sk_buff *skb,
return vlan_features_check(skb, features);
}
static netdev_features_t gso_features_check(const struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features)
{
u16 gso_segs = skb_shinfo(skb)->gso_segs;
if (gso_segs > dev->gso_max_segs)
return features & ~NETIF_F_GSO_MASK;
/* Make sure to clear the IPv4 ID mangling feature if
* the IPv4 header has the potential to be fragmented.
*/
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
struct iphdr *iph = skb->encapsulation ?
inner_ip_hdr(skb) : ip_hdr(skb);
if (!(iph->frag_off & htons(IP_DF)))
features &= ~NETIF_F_TSO_MANGLEID;
}
return features;
}
netdev_features_t netif_skb_features(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
netdev_features_t features = dev->features;
u16 gso_segs = skb_shinfo(skb)->gso_segs;
if (gso_segs > dev->gso_max_segs)
features &= ~NETIF_F_GSO_MASK;
if (skb_is_gso(skb))
features = gso_features_check(skb, dev, features);
/* If encapsulation offload request, verify we are testing
* hardware encapsulation features instead of standard
@ -6976,9 +6998,11 @@ int register_netdevice(struct net_device *dev)
dev->features |= NETIF_F_SOFT_FEATURES;
dev->wanted_features = dev->features & dev->hw_features;
if (!(dev->flags & IFF_LOOPBACK)) {
if (!(dev->flags & IFF_LOOPBACK))
dev->hw_features |= NETIF_F_NOCACHE_COPY;
}
if (dev->hw_features & NETIF_F_TSO)
dev->hw_features |= NETIF_F_TSO_MANGLEID;
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
*/