Willem de Bruijn wrote:
> Richard Gobert wrote:
>> This patch adds network_offset and inner_network_offset to napi_gro_cb, and
>> makes sure both are set correctly. In the common path there's only one
>> write (skb_gro_reset_offset).
>>
>> Signed-off-by: Richard Gobert <richardbgobert@xxxxxxxxx>
>> ---
>> drivers/net/geneve.c | 1 +
>> drivers/net/vxlan/vxlan_core.c | 1 +
>> include/net/gro.h | 18 ++++++++++++++++--
>> net/8021q/vlan_core.c | 2 ++
>> net/core/gro.c | 1 +
>> net/ethernet/eth.c | 1 +
>> net/ipv4/af_inet.c | 5 +----
>> net/ipv4/gre_offload.c | 1 +
>> net/ipv6/ip6_offload.c | 8 ++++----
>> 9 files changed, 28 insertions(+), 10 deletions(-)
>>
>> diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
>> index d4520c3f7c09..ae596285d78c 100644
>> --- a/net/ipv4/gre_offload.c
>> +++ b/net/ipv4/gre_offload.c
>> @@ -224,6 +224,7 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
>> /* Adjusted NAPI_GRO_CB(skb)->csum after skb_gro_pull()*/
>> skb_gro_postpull_rcsum(skb, greh, grehlen);
>>
>> + NAPI_GRO_CB(skb)->inner_network_offset = hlen;
>> pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
>> flush = 0;
>
> Nice that this even works for ETH_P_TEB, as eth_gro_receive will
> overwrite the offset written here.
>
>
>> list_for_each_entry(p, head, list) {
>> const struct ipv6hdr *iph2;
>> @@ -327,6 +325,7 @@ static struct sk_buff *sit_ip6ip6_gro_receive(struct list_head *head,
>> }
>>
>> NAPI_GRO_CB(skb)->encap_mark = 1;
>> + NAPI_GRO_CB(skb)->inner_network_offset = skb_gro_offset(skb);
>>
>> return ipv6_gro_receive(head, skb);
>> }
>> @@ -342,6 +341,7 @@ static struct sk_buff *ip4ip6_gro_receive(struct list_head *head,
>> }
>>
>> NAPI_GRO_CB(skb)->encap_mark = 1;
>> + NAPI_GRO_CB(skb)->inner_network_offset = skb_gro_offset(skb);
>
> Do we still need encap_mark, or is it always set at the same time that
> inner_network_offset becomes non-zero?
>
This would require setting inner_network_header to 0 before dev_gro_receive
which would not be favorable to the common case. (As opposed to encap_mark
which is already set to 0 as being part of NAPI_GRO_CB->zeroed). In my
opinion, it might also be less readable.
