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tcp/dccp: Consolidate common code for RFC 3390 conversion

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This patch consolidates initial-window code common to TCP and CCID-2:
 * TCP uses RFC 3390 in a packet-oriented manner (tcp_input.c) and
 * CCID-2 uses RFC 3390 in packet-oriented manner (RFC 4341).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2010-08-29 19:23:12 +00:00 • committed by David S. Miller
parent d26eeb07fd
commit 22b71c8f4f
3 changed files with 19 additions and 21 deletions
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17
net/ipv4/tcp_input.c
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@ -805,25 +805,12 @@ void tcp_update_metrics(struct sock *sk)
}
}
/* Numbers are taken from RFC3390.
*
* John Heffner states:
*
* The RFC specifies a window of no more than 4380 bytes
* unless 2*MSS > 4380. Reading the pseudocode in the RFC
* is a bit misleading because they use a clamp at 4380 bytes
* rather than use a multiplier in the relevant range.
*/
__u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst)
{
__u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0);
if (!cwnd) {
if (tp->mss_cache > 1460)
cwnd = 2;
else
cwnd = (tp->mss_cache > 1095) ? 3 : 4;
}
if (!cwnd)
cwnd = rfc3390_bytes_to_packets(tp->mss_cache);
return min_t(__u32, cwnd, tp->snd_cwnd_clamp);
}