tcp: minor optimization in tcp ack fast path processing

Bitwise operation is a little faster.
So I replace after() with using the flag FLAG_SND_UNA_ADVANCED as it is
already set before.

In addtion, there's another similar improvement in tcp_cwnd_reduction().

Cc: Joe Perches <joe@perches.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2868ef28ce52..edaaebfbcd46 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2457,8 +2457,8 @@ void tcp_cwnd_reduction(struct sock *sk, int newly_acked_sacked, int flag)
                 u64 dividend = (u64)tp->snd_ssthresh * tp->prr_delivered +
                                tp->prior_cwnd - 1;
                 sndcnt = div_u64(dividend, tp->prior_cwnd) - tp->prr_out;
-        } else if ((flag & FLAG_RETRANS_DATA_ACKED) &&
-                   !(flag & FLAG_LOST_RETRANS)) {
+        } else if ((flag & (FLAG_RETRANS_DATA_ACKED | FLAG_LOST_RETRANS)) ==
+                   FLAG_RETRANS_DATA_ACKED) {
                 sndcnt = min_t(int, delta,
                                max_t(int, tp->prr_delivered - tp->prr_out,
                                      newly_acked_sacked) + 1);
@@ -3610,7 +3610,8 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
         if (flag & FLAG_UPDATE_TS_RECENT)
                 tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
 
-        if (!(flag & FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
+        if ((flag & (FLAG_SLOWPATH | FLAG_SND_UNA_ADVANCED)) ==
+            FLAG_SND_UNA_ADVANCED) {
                 /* Window is constant, pure forward advance.
                  * No more checks are required.
                  * Note, we use the fact that SND.UNA>=SND.WL2.