Recent driver changes destabilized QCA9377 connection quality

[Michal Kazior]

On 26 February 2017 at 16:40, Tobias Predel <tobias.predel at gmail.com> wrote:
> Hello,
[...]
> (2) Many FCS (frame check sequence) errors paired with "len 0"?
>
> [  872.338194] ath10k_pci 0000:02:00.0: rx skb ffff88003765ec00 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1470 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0
> [  872.952364] ath10k_pci 0000:02:00.0: rx skb ffff880011356400 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1476 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0
> [  873.259564] ath10k_pci 0000:02:00.0: rx skb ffff88001ce2fd00 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1479 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0
> [  874.181195] ath10k_pci 0000:02:00.0: rx skb ffff88004b26be00 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1488 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0
> [  874.488037] ath10k_pci 0000:02:00.0: rx skb ffff88004b26bb00 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1491 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0
> [  874.795505] ath10k_pci 0000:02:00.0: rx skb ffff880037856e00 len 0 peer 00:XX:XX:XX:XX:88  mcast sn 1496 legacy rate_idx 0 vht_nss 0 freq 2447 band 0 flag 0x1200020 fcs-err 1 mic-err 0 amsdu-more 0

QCA9377 can report "offloaded" frames which don't carry rx descriptor.
I can imagine that if - for whatever reason - offloaded frame is
treated as non-offloaded it'd end up shorter and parsed incorrectly
(i.e. bad fcs). I'd be interested in seeing htt dumps of buffers
related to these rx skbs.


Michał