Hi,
Periodically validating the keycache would work as far as I'm concerned,
although I'm not sure that a patch for the ath9k would be accepted if that hits
the mac80211/cfg80211 layers. This is why I did not look into this, figuring
that this should be handled at ath9k level somehow. I did not check if it is
possible to access the kernel keycache from within the ath9k driver, this might
be an idea.
What I do see when calling iw dev mesh0 station dump is that there's an
inactivity timer kept for all stations (=mesh nodes), so it should be possible.
As to TX/RX, I added a monitor interface on the receiving node, and using
wireshark I could see packets arriving when the link was not working anymore.
That, and the RX_DROP_MISC increasing seems to indicate an RX issue to me. But,
if the transmitting end does not use the right key, this would yield the same
result, as both ends need to agree on the same key for this to work.
Note that on both nodes I added some debugging to dump the contents of the
registers, and that seems to be identical; what is written to it is read back
after the write, as well.
Would you mind checking if the patch I sent (replumb_did_not_work.diff) is
sound as far as the moment the replumb occurs? Because if that is the case,
this would suggest a TX side problem, as this did not seem to fix the issue.
Cheers
Michel
--- Begin Message ---
Right, I just checked. They have some code that reads the key and mic
to compare against what was programmed, and they're calling it each
iteration of ieee80211_timeout_stations().
That happens pretty infrequently (every second, or 15, or 30? not sure
without digging.)
How about doing some periodic re-reading of the keycache to see if
something pops up?
Is it a TX or RX related issue?
If it's an RX only related issue, we could fix it by noticing decrypt
failures for a given key index/MAC and then forcing a replumb.
-adrian
--- End Message ---
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