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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-13 11:51:40 +0100
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-13 11:51:40 +0100
commitb552c6231f19d50165bbf59e8b34d3f713ab5c01 (patch)
tree7ef572ce7356789e3152120a5b9b8621954e02af /net/dccp/ccids/ccid3.c
parent5b5d0e704880addfd979c262e6441f126708539c (diff)
dccp ccid-3: Fix a loss detection bug
This fixes a bug in the logic of the TFRC loss detection: * new_loss_indicated() should not be called while a loss is pending; * but the code allows this; * thus, for two subsequent gaps in the sequence space, when loss_count has not yet reached NDUPACK=3, the loss_count is falsely reduced to 1. To avoid further and similar problems, all loss handling and loss detection is now done inside tfrc_rx_hist_handle_loss(), using an appropriate routine to track new losses. Further changes: ---------------- * added a reminder that no RX history operations should be performed when rx_handle_loss() has identified a (new) loss, since the function takes care of packet reordering during loss detection; * made tfrc_rx_hist_loss_pending() bool (thanks to an earlier suggestion by Arnaldo); * removed unused functions. 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.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 523db262c18..f6756e0c9e6 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -825,18 +825,16 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
/*
- * Handle pending losses and otherwise check for new loss
+ * Perform loss detection and handle pending losses
*/
- if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist) &&
- tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist,
- &hcrx->ccid3hcrx_li_hist,
- skb, ndp, ccid3_first_li, sk) ) {
+ if (tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist, &hcrx->ccid3hcrx_li_hist,
+ skb, ndp, ccid3_first_li, sk)) {
do_feedback = CCID3_FBACK_PARAM_CHANGE;
goto done_receiving;
}
- if (tfrc_rx_hist_new_loss_indicated(&hcrx->ccid3hcrx_hist, skb, ndp))
- goto update_records;
+ if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist))
+ return; /* done receiving */
/*
* Handle data packets: RTT sampling and monitoring p