tcp: fix ssthresh u16 leftover

It was once upon time so that snd_sthresh was a 16-bit quantity.
...That has not been true for long period of time. I run across
some ancient compares which still seem to trust such legacy.
Put all that magic into a single place, I hopefully found all
of them.

Compile tested, though linking of allyesconfig is ridiculous
nowadays it seems.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7718a9261efb..21d100b68b19 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1846,7 +1846,7 @@ static int tcp_v6_init_sock(struct sock *sk)
         /* See draft-stevens-tcpca-spec-01 for discussion of the
          * initialization of these values.
          */
-        tp->snd_ssthresh = 0x7fffffff;
+        tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
         tp->snd_cwnd_clamp = ~0;
         tp->mss_cache = 536;
 
@@ -1969,7 +1969,8 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
                    jiffies_to_clock_t(icsk->icsk_rto),
                    jiffies_to_clock_t(icsk->icsk_ack.ato),
                    (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
-                   tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
+                   tp->snd_cwnd,
+                   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
                    );
 }