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Commit 26722873 authored by David S. Miller's avatar David S. Miller
Browse files

[TCP]: Describe tcp_init_cwnd() thoroughly in a comment. 



People often get tripped up by this function and think that
it does not implemented the prescribed algorithms from
RFC2414 and RFC3390, even though it does.

So add a comment to head off such misunderstandings in the
future.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a96fb49b

net/ipv4/tcp_input.c

+9 −1
Original line number Diff line number Diff line
@@ -755,7 +755,15 @@ void tcp_update_metrics(struct sock *sk) 
	}

}



/* Numbers are taken from RFC2414.  */

/* 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);