net: Adjust sk_gso_max_size once when set
sk_gso_max_size is set based on the dst dev. Both users of it
adjust the value by the same offset - (MAX_TCP_HEADER + 1). Rather
than compute the same adjusted value on each call do the adjustment
once when set.
Signed-off-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220125024511.27480-1-dsahern@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 78e8146..cf1ce81 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -894,8 +894,7 @@ static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now,
return mss_now;
/* Note : tcp_tso_autosize() will eventually split this later */
- new_size_goal = sk->sk_gso_max_size - 1 - MAX_TCP_HEADER;
- new_size_goal = tcp_bound_to_half_wnd(tp, new_size_goal);
+ new_size_goal = tcp_bound_to_half_wnd(tp, sk->sk_gso_max_size);
/* We try hard to avoid divides here */
size_goal = tp->gso_segs * mss_now;
