TP>
TP>Are you talking about a different bug?
GY> Hm, may bee, but according to Chaoxing Lin emails there is several bugs which cause performance degradation in 802.11s mode, and symptoms in my case indentical, i get same results as Chaoxing Lin, and seems same throbles, i will make tests what you want anyway and report results.
For easy reference, I summarize the 4 problems I uncovered so far that contribute to in-stability of 7-node 802.11s network.
1. ath9k "Tx DMA error". Ping packet loss is seen each time "Fail to stop Tx DMA" log is seen. It's NOT the main cause.
2. authsae or 802.11s kernel problem: The two ends of a peer link get out of sync for whatever reason. One end says, the peer link is "ESTAB" and all 3 keys are in place. While the other end says this peer link is not "ESTAB", no keys installed for the peer.
3. AES-CCM pairwise key sometimes complains packet replay so ping packets are dropped. A kernel key dump in this error case is below. (I overwrote key_key_read() function in debugfs_key.c to dump all info)
Key 362:
0xcf393800 AES-CCM Key: 49305a736a8b6d5fcb34057ee6983d44 Pairwise
Peer MAC: 00:0e:8e:38:36:03
tx_pn: 000000000000009f
rx_pn[ 0]: 0000000d788b rx_pn[ 1]: 000000000000 rx_pn[ 2]: 000000000000
rx_pn[ 3]: 000000000000
rx_pn[ 4]: 000000000000 rx_pn[ 5]: 000000000000 rx_pn[ 6]: 000000000000
rx_pn[ 7]: 000000000000
rx_pn[ 8]: 000000000000 rx_pn[ 9]: 000000000000 rx_pn[10]: 000000000000
rx_pn[11]: 000000000000
rx_pn[12]: 000000000000 rx_pn[13]: 000000000000 rx_pn[14]: 000000000000
rx_pn[15]: 000000000000
rx_pn[16]: 000000003580
replays: 11970 icverror: <=======================problem here===========
The worse thing for problem 2 and 3 above is, when it gets into this state, the mpath still stays active. So all packets are still routed to the bad peer link/mpath and will be dropped by peer.
4. 802.11n packet aggregation. I believe this is the main problem by the fact that, disabling 802.11n packet aggregation in ath9k driver will make the network stable and problem 2 and 3 are not seen. In other words, problem 2 and 3 may be caused by aggregation (my imagination, aggregation caused certain error condition that is not handled properly, which triggers problem 2 and 3)
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