Any tips on where per-packet antenna selection could be pushed?

[Zach Sherin]

Interesting. Could I ask if there's somewhere I should start digging?
If it's not obvious I'm a driver/kernel newbie, but I'm happy to
learn. Should I start by going through ath10k's documentation/code
until I find the relevant bits?

Thanks,
Zach


On Mon, Jun 6, 2016 at 2:42 PM, Adrian Chadd <adrian.chadd at gmail.com> wrote:
> I bet the ruckus mode shift stuff is in the ath10k hardware and is
> configurable per TX descriptor.
>
> a
>
> On Jun 6, 2016 11:03 AM, "Ben Greear" <greearb at candelatech.com> wrote:
>>
>> On 06/06/2016 10:59 AM, Zach Sherin wrote:
>>>
>>> I was aiming to run this off a serial interface on the general board,
>>> not on the ath10k NIC. I have a consumer QCA9880 PCI board in an
>>> Archer C7 router. It would be awesome if I could steal a GPIO or
>>> something from the atheros chip to output, but I was assuming I
>>> couldn't. The main reason I was looking at the ath10k driver was to
>>> get as close to when the packets are transmitted as possible, to leave
>>> as little room for error in the switching as possible.
>>>
>>> However, it's  possible that I'm hoping for too much there. I'd be
>>> interested to hear your thoughts on it. If I can't pull it off, I'll
>>> move to an approach outside ath10k.
>>
>>
>> The driver just sends pkts to the firmware, it is the firmware that
>> knows when a pkt is to be transmitted, so I think you would have to have
>> some
>> hooks low in the firmware tx logic to do what you want.  And you would
>> need some
>> hardware output from the NIC.
>>
>> I am guessing it would require quite a bit of changes to the firmware,
>> possibly very tricky/hacky ones, and hardware output on your NIC.
>>
>> Thanks,
>> Ben
>>
>> --
>> Ben Greear <greearb at candelatech.com>
>> Candela Technologies Inc  http://www.candelatech.com
>>
>>
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