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tcp: use MAX_TCP_HEADER in tcp_stream_alloc_skb

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Both IPv4 and IPv6 uses same reserve, no need risking
cache line misses to fetch its value.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-10-25 15:13:41 -07:00 committed by David S. Miller
parent f8dd3b8d70
commit 8a794df693
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp.c
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@ -867,7 +867,7 @@ struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
if (unlikely(tcp_under_memory_pressure(sk)))
sk_mem_reclaim_partial(sk);
skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp);
skb = alloc_skb_fclone(size + MAX_TCP_HEADER, gfp);
if (likely(skb)) {
bool mem_scheduled;
@ -878,7 +878,7 @@ struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
mem_scheduled = sk_wmem_schedule(sk, skb->truesize);
}
if (likely(mem_scheduled)) {
skb_reserve(skb, sk->sk_prot->max_header);
skb_reserve(skb, MAX_TCP_HEADER);
/*
* Make sure that we have exactly size bytes
* available to the caller, no more, no less.