[CCID 3]: Avoid accumulation of large send credit
Backlogs of packets can accumulate in the CCID3 TX module when for instance
the application does not send for a longer time or sends slowly.
With regard to computing t_nom, this leads to an accumulation of send credits.
The present patch avoids large packet bursts that would result under these
conditions, by setting the backlog window of tardiness to one t_ipi unit.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/ccid3.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -352,7 +352,9 @@ static int ccid3_hc_tx_send_packet(struc
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
delay = ktime_delta(hctx->ccid3hctx_t_nom, now);
- ccid3_pr_debug("delay=%ld\n", (long)delay);
+ /* Resynchronise t_nom when sender has been idle or slow */
+ if (delay + (s64)hctx->ccid3hctx_t_ipi < 0)
+ hctx->ccid3hctx_t_nom = now;
/*
* Scheduling of packet transmissions [RFC 3448, 4.6]
*
@@ -361,7 +363,7 @@ static int ccid3_hc_tx_send_packet(struc
* else
* // send the packet in (t_nom - t_now) milliseconds.
*/
- if (delay - (s64)hctx->ccid3hctx_delta >= 1000)
+ else if (delay - (s64)hctx->ccid3hctx_delta >= 1000)
return (u32)delay / 1000L;
ccid3_hc_tx_update_win_count(hctx, now);
-
To unsubscribe from this list: send the line "unsubscribe dccp" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
