ath10k + iw set bitrates is causing FW crash

[Krishna Chaitanya]

On Fri, Jul 8, 2016 at 8:57 PM, Krishna Chaitanya
<chaitanya.mgit at gmail.com> wrote:
> On Fri, Jul 8, 2016 at 6:29 PM, Manoharan, Rajkumar
> <rmanohar at qti.qualcomm.com> wrote:
>> I think security failures are due to peer unmap & map upon reassoc. Can you please try below change?
>>
>> diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
>> index 5e1cc8f4c43c..f7f04bb46fc8 100644
>> --- a/drivers/net/wireless/ath/ath10k/mac.c
>> +++ b/drivers/net/wireless/ath/ath10k/mac.c
>> @@ -5745,8 +5745,9 @@ static void ath10k_sta_rc_update_wk(struct work_struct *wk)
>>                                     sta->addr, smps, err);
>>         }
>>
>> -       if (changed & IEEE80211_RC_SUPP_RATES_CHANGED ||
>> -           changed & IEEE80211_RC_NSS_CHANGED) {
>> +       if ((changed & IEEE80211_RC_SUPP_RATES_CHANGED ||
>> +           changed & IEEE80211_RC_NSS_CHANGED) &&
>> +           (arvif->vif->type == NL80211_IFTYPE_ADHOC)) {
>>                 ath10k_dbg(ar, ATH10K_DBG_MAC, "mac update sta %pM supp rates/nss\n",
>>                            sta->addr);
>
> Bottom posting please. I have tried your change i still see the same issue.
> Right after connecting i see that packets are encrypted but once it
> unset/set "bitrates" plain packets are seen in sniffer.
>
> BTW, i am not rebooting for each driver update, just re-inserting the module,
> do i need to do a reboot for each driver change?

After reboot i dont see the "unencrypted" packet issue, i will do
some more testing on limiting the rates, currently in my setup its
not reaching MCS9 so cannot verify now.

Thanks for the fixes and prompt reply.
  ________________________________________
>> From: Krishna Chaitanya <chaitanya.mgit at gmail.com>
>> Sent: Friday, July 8, 2016 5:26 PM
>> To: Manoharan, Rajkumar
>> Cc: linux-wireless; ath10k
>> Subject: Re: ath10k + iw set bitrates is causing FW crash
>>
>> On Fri, Jul 8, 2016 at 3:39 PM, Manoharan, Rajkumar
>> <rmanohar at qti.qualcomm.com> wrote:
>>>>> I am using ath10k driver with qca988x hw2.0 and trying to limit it to use
>>>>> VHT MCS0-7 (iw set bitrates vht-mcs-5 2:0-7).
>>>>>
>>>>> But the command it causing a FW crash, if it disable HW_HAS_RATE_CONTROL
>>>>> no crash is observed but it still uses MCS9.
>>>>>
>>>>> tree: wireless-drivers-next: commit#535633a5ba4ea2504fa6c33176633becf0e59339
>>>>>
>>>>> 1) If i disable HW_RATE_CONTROL, will ath10k honor
>>>>> the mac80211 rates?
>>>>>
>>>>
>>> Thanks for reporting the issue. Could you please try with below change?
>>>
>>> diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
>>> index 5e1cc8f4c43c..cfa7e01a6103 100644
>>> --- a/drivers/net/wireless/ath/ath10k/mac.c
>>> +++ b/drivers/net/wireless/ath/ath10k/mac.c
>>> @@ -2812,6 +2812,9 @@ static int ath10k_station_assoc(struct ath10k *ar,
>>>                 return ret;
>>>         }
>>>
>>> +       if (vif->type != NL80211_IFTYPE_ADHOC)
>>> +               peer_arg.peer_reassoc = reassoc;
>>> +
>>>         ret = ath10k_wmi_peer_assoc(ar, &peer_arg);
>>>         if (ret) {
>>>                 ath10k_warn(ar, "failed to run peer assoc for STA %pM vdev %i: %d\n",
>>
>> Thanks Raj, with this fix the rates are 0-7, if i disable then i am
>> seeing 0-9, so its
>> working.
>>
>> But i am seeing a weird issues, the moment i give bitrates command,
>> ath10k no longer does encryption, link is a WPA2-PSK: AES. Even after
>> interface up/down
>> it doesn't work.