HW retransmissions
Steger, Marco
Marco.Steger at v2c2.at
Tue Dec 1 03:24:22 PST 2015
Dear all,
I'm setting up a real testbed for validation IEEE802.11s nodes for different automotive scenarios. I'm using BeagleBone boards running Debian and the TL-WN722N stick (ATH9k_htc). For the evaluation I need a lot of different parameters of the nodes and the links.
All the 11s (mesh) specific information I collect in the Linux kernel module mac80211.ko (I've added some debug function to write data blobs using debugfs). I can use
* ieee80211_tx_info
* ieee80211_rx_status
* sta_info
* mesh_sta
And so on. With that I get a lot of useful and important parameters. With "(txinfo->flags & IEEE80211_TX_STAT_ACK), where txinfo is a ieee80211_tx_info* " I can check if the transmission we successful or not. But I think I'm still missing one: The retransmission on the HW and I hope you can help me a little bit with that:
* Are there retransmissions on the HW? (Directly done by the ATH9k_htc).
* If yes, how can I get the number of retransmission for every frame? Is this possible? Maybe this is already somewhere hidden in the structs mentioned above.
* If there are retransmission, is there a way to turn it off for testing purposes?
Would be really great if you can help me with that!
Thanks in advance!
Best regards,
Marco
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