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[TCP]: Code duplication removal, added tcp_bound_to_half_wnd() 

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-12-31 14:57:40 -08:00 committed by David S. Miller
parent 056834d9f6
commit 409d22b470
1 changed files with 11 additions and 8 deletions
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19
net/ipv4/tcp_output.c
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@ -888,6 +888,15 @@ void tcp_mtup_init(struct sock *sk)
icsk->icsk_mtup.probe_size = 0;
}
/* Bound MSS / TSO packet size with the half of the window */
static int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize)
{
if (tp->max_window && pktsize > (tp->max_window >> 1))
return max(tp->max_window >> 1, 68U - tp->tcp_header_len);
else
return pktsize;
}
/* This function synchronize snd mss to current pmtu/exthdr set.
tp->rx_opt.user_mss is mss set by user by TCP_MAXSEG. It does NOT counts
@ -920,10 +929,7 @@ unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu)
icsk->icsk_mtup.search_high = pmtu;
mss_now = tcp_mtu_to_mss(sk, pmtu);
/* Bound mss with half of window */
if (tp->max_window && mss_now > (tp->max_window >> 1))
mss_now = max((tp->max_window >> 1), 68U - tp->tcp_header_len);
mss_now = tcp_bound_to_half_wnd(tp, mss_now);
/* And store cached results */
icsk->icsk_pmtu_cookie = pmtu;
@ -977,10 +983,7 @@ unsigned int tcp_current_mss(struct sock *sk, int large_allowed)
inet_csk(sk)->icsk_ext_hdr_len -
tp->tcp_header_len);
if (tp->max_window && (xmit_size_goal > (tp->max_window >> 1)))
xmit_size_goal = max((tp->max_window >> 1),
68U - tp->tcp_header_len);
xmit_size_goal = tcp_bound_to_half_wnd(tp, xmit_size_goal);
xmit_size_goal -= (xmit_size_goal % mss_now);
}
tp->xmit_size_goal = xmit_size_goal;