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net: tcp: Reset net_pkt creation time if packet is resent

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In TCP, we increase the net_pkt refcount in order to resend
it later if we do not receive ACK in time. Because we are not
getting a new net_pkt, the TXTIME statistics would be calculated
incorrectly. So if we re-send, reset the net_pkt creation time.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2020-05-13 11:17:19 +03:00 • committed by Jukka Rissanen
commit 0f5fdec0d7
1 changed files with 14 additions and 0 deletions
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14
subsys/net/ip/tcp.c
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@ -245,6 +245,20 @@ static void tcp_retry_expired(struct k_work *work)
return;
}
if (IS_ENABLED(CONFIG_NET_PKT_TXTIME_STATS)) {
/* If we have enabled net_pkt TXTIME statistics, and we
* about to re-send already sent net_pkt, then reset
* the net_pkt start time as otherwise the TX average
* will be wrong (as it would be calculated from when
* the packet was created).
*/
struct net_ptp_time tp = {
.nanosecond = k_cycle_get_32(),
};
net_pkt_set_timestamp(pkt, &tp);
}
net_pkt_set_queued(pkt, true);
net_pkt_set_tcp_1st_msg(pkt, false);