Block ACK in Ralink RT2860

[PseudoCylon]

On Wed, Jan 30, 2013 at 1:20 PM, Ramanujan Seshadri
<ksramanujan at gmail.com> wrote:
> Thank you. I also wanted to know the function where the Block ACK Window
> will be decided. is it decided during the ADDBA session establishment or
> does it change dynamically.

The hardware will aggregate packets until any of following limits hit max
http://fxr.watson.org/fxr/source/dev/ral/rt2860reg.h#L782
* rt2860_txwi.flags
        RT2860_TX_MPDU_DSITY_SHIFT
        000 == no restriction
        001 == 1/4 us
        010 == 1/2 us
        ...
        111 == 16 us
* rt2860_txwi.xflags
        RT2860_TX_BAWINSIZE_SHIFT (frame count)

http://fxr.watson.org/fxr/source/dev/ral/rt2860reg.h#L93
* RT2860_MAX_LEN_CFG bit 12:13
        00 == 8k bytes
        01 == 16k
        10 == 32k
        11 == 64k

At a quick look, none of them is set in current code. Also,
RT2860_TX_AMPDU flag need to be set to make the h/w aggregate packets.

How is ampdu working on ral(4)? I cannot test because I do not have
any ral(4) nic (only have run(4) nics).


AK

>
>
> On Thu, Jan 24, 2013 at 5:13 PM, PseudoCylon <moonlightakkiy at yahoo.ca>
> wrote:
>>
>> > Message: 6
>> > Date: Thu, 24 Jan 2013 12:23:55 -0500
>> > From: Ramanujan Seshadri <ksramanujan at gmail.com>
>> > To: freebsd-net at freebsd.org
>> > Subject: Block ACK in Ralink RT2860
>> > Message-ID:
>> >
>> > <CAK=C58KyA80kgVqenHj8xEkmkKDNHnmbQkZoyKQ-K6r_7V4GGA at mail.gmail.com>
>> > Content-Type: text/plain; charset=ISO-8859-1
>> >
>> > Hi all,
>> > I am trying  to read the contents of block ack's in a Ralink RT2860
>> > driver.
>> > Can you please help me to know which function i should be looking into ?
>>
>> At default, all BA packets are dropped by h/w. Clear RT2860_DROP_BA flag
>> at
>> http://fxr.watson.org/fxr/source/dev/ral/rt2860.c#L3559
>>
>> Then, the diver should receive BA packets, and you can read them.
>>
>>
>> AK
>
>