#617: Wireless packets disapear probably at the receiver
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Reporter: [EMAIL PROTECTED] | Owner:
Type: defect | Status: new
Priority: major | Milestone:
Component: madwifi: other | Version: trunk
Resolution: | Keywords: lost packet
Patch_attached: 0 |
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Comment (by [EMAIL PROTECTED]):
I believe that I found the problem although I am not exactly wure why I
see this statistics. Anyway, the macro that checks that the sequence
number is not duplicate defines in ieee80211.h as follows:
#define IEEE80211_SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
and is called from ieee80211_input.c as follows:
if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
IEEE80211_SEQ_LEQ(rxseq, ni->ni_rxseqs[tid]))
This will not work well when the sequence number wraps around (from 4095
to 0).
I believe that the macro definition should be:
#define IEEE80211_SEQ_LEQ(a,b) ((int)((a)-(b)) == 0)
Indeed, trying this eliminates the dropped packets.
I still do not understand why it happeneds so infrequently (about 8
packets per million).
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Ticket URL: <http://madwifi.org/ticket/617>
MadWifi <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity-------------------------------------------------------------------------
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