diff options
| author | Alexander Duyck <aduyck@mirantis.com> | 2016-04-11 03:45:03 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-14 22:23:41 +0200 |
| commit | 802ab55adc39a06940a1b384e9fd0387fc762d7e (patch) | |
| tree | 96aace3c09e144382c95c4a90cba3ce46eb660c0 /net/ipv6/ip6_offload.c | |
| parent | GRO: Add support for TCP with fixed IPv4 ID field, limit tunnel IP ID values (diff) | |
| download | linux-802ab55adc39a06940a1b384e9fd0387fc762d7e.tar.xz linux-802ab55adc39a06940a1b384e9fd0387fc762d7e.zip | |
GSO: Support partial segmentation offload
This patch adds support for something I am referring to as GSO partial.
The basic idea is that we can support a broader range of devices for
segmentation if we use fixed outer headers and have the hardware only
really deal with segmenting the inner header. The idea behind the naming
is due to the fact that everything before csum_start will be fixed headers,
and everything after will be the region that is handled by hardware.
With the current implementation it allows us to add support for the
following GSO types with an inner TSO_MANGLEID or TSO6 offload:
NETIF_F_GSO_GRE
NETIF_F_GSO_GRE_CSUM
NETIF_F_GSO_IPIP
NETIF_F_GSO_SIT
NETIF_F_UDP_TUNNEL
NETIF_F_UDP_TUNNEL_CSUM
In the case of hardware that already supports tunneling we may be able to
extend this further to support TSO_TCPV4 without TSO_MANGLEID if the
hardware can support updating inner IPv4 headers.
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_offload.c')
| -rw-r--r-- | net/ipv6/ip6_offload.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index 061adcda65f3..f5eb184e1093 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -63,6 +63,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int proto; struct frag_hdr *fptr; unsigned int unfrag_ip6hlen; + unsigned int payload_len; u8 *prevhdr; int offset = 0; bool encap, udpfrag; @@ -82,6 +83,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM | SKB_GSO_TUNNEL_REMCSUM | + SKB_GSO_PARTIAL | 0))) goto out; @@ -118,7 +120,13 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, for (skb = segs; skb; skb = skb->next) { ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff); - ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h)); + if (skb_is_gso(skb)) + payload_len = skb_shinfo(skb)->gso_size + + SKB_GSO_CB(skb)->data_offset + + skb->head - (unsigned char *)(ipv6h + 1); + else + payload_len = skb->len - nhoff - sizeof(*ipv6h); + ipv6h->payload_len = htons(payload_len); skb->network_header = (u8 *)ipv6h - skb->head; if (udpfrag) { |