Commit 8a794df6 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: use MAX_TCP_HEADER in tcp_stream_alloc_skb 



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

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f8dd3b8d

net/ipv4/tcp.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -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)))

	if (unlikely(tcp_under_memory_pressure(sk)))

		sk_mem_reclaim_partial(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)) {

	if (likely(skb)) {

		bool mem_scheduled;

		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);

			mem_scheduled = sk_wmem_schedule(sk, skb->truesize);

		}

		}

		if (likely(mem_scheduled)) {

		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

			 * Make sure that we have exactly size bytes

			 * available to the caller, no more, no less.

			 * available to the caller, no more, no less.