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tcp: gro: micro optimizations in tcp[4]_gro_complete()

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In tcp_gro_complete() :

Moving the skb->inner_transport_header setting
allows the compiler to reuse the previously loaded value
of skb->transport_header.

Caching skb_shinfo() avoids duplications as well.

In tcp4_gro_complete(), doing a single change on
skb_shinfo(skb)->gso_type also generates better code.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2024-03-01 19:37:40 +00:00 committed by Paolo Abeni
parent c7583e9f76
commit 8f78010b70
1 changed files with 9 additions and 8 deletions
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17
net/ipv4/tcp_offload.c
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@ -299,18 +299,20 @@ out:
void tcp_gro_complete(struct sk_buff *skb)
{
struct tcphdr *th = tcp_hdr(skb);
struct skb_shared_info *shinfo;
if (skb->encapsulation)
skb->inner_transport_header = skb->transport_header;
skb->csum_start = (unsigned char *)th - skb->head;
skb->csum_offset = offsetof(struct tcphdr, check);
skb->ip_summed = CHECKSUM_PARTIAL;
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
shinfo = skb_shinfo(skb);
shinfo->gso_segs = NAPI_GRO_CB(skb)->count;
if (th->cwr)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
if (skb->encapsulation)
skb->inner_transport_header = skb->transport_header;
shinfo->gso_type |= SKB_GSO_TCP_ECN;
}
EXPORT_SYMBOL(tcp_gro_complete);
@ -335,10 +337,9 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
iph->daddr, 0);
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
if (NAPI_GRO_CB(skb)->is_atomic)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4 |
(NAPI_GRO_CB(skb)->is_atomic * SKB_GSO_TCP_FIXEDID);
tcp_gro_complete(skb);
return 0;