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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 07:30:19 +0200
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 07:45:41 +0200
commit3ca7aea04152255bb65275b0018d3c673bc1f4e7 (patch)
tree828ffb82255e3a5f164039223e87145af0d611e5 /net/dccp/ccids/ccid3.c
parentd20ed95f8bf3d98d31dbbab8b00bb4c1a4a140f3 (diff)
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dccp tfrc: Return type of update_i_mean is void
This changes the return type of tfrc_lh_update_i_mean() to void, since that function returns always `false'. This is due to len = dccp_delta_seqno(cur->li_seqno, DCCP_SKB_CB(skb)->dccpd_seq) + 1; if (len - (s64)cur->li_length <= 0) /* duplicate or reordered */ return 0; which means that update_i_mean can only increase the length of the open loss interval I_0, and hence the value of I_tot0 (RFC 3448, 5.4). Consequently the test `i_mean < old_i_mean' at the end of the function always evaluates to false. There is no known way by which a loss interval can suddenly become shorter, therefore the return type of the function is changed to void. (That is, under the given circumstances step (3) in RFC 3448, 6.1 will not occur.) Further changes: ---------------- * the function is now called from tfrc_rx_handle_loss, which is equivalent to the previous way of calling from rx_packet_recv (it was called whenever there was no new or pending loss, now it is also updated when there is a pending loss - this increases the accuracy a bit); * added a FIXME to possibly consider NDP counting as per RFC 4342 (this is not implemented yet). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net/dccp/ccids/ccid3.c')
-rw-r--r--net/dccp/ccids/ccid3.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 0a7c22598d62..50dac01e48c5 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -767,15 +767,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
*/
if (sample != 0)
hcrx->rtt = tfrc_ewma(hcrx->rtt, sample, 9);
-
- } else if (tfrc_lh_update_i_mean(&hcrx->li_hist, skb)) {
- /*
- * Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean
- * has decreased (resp. p has increased), send feedback now.
- */
- do_feedback = CCID3_FBACK_PARAM_CHANGE;
}
-
/*
* Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3
*/