Date: Tue, 23 Aug 2011 18:29:18 +0800 From: Adrian Chadd <adrian@freebsd.org> To: Kang Yin Su <cantona@cantona.net> Cc: freebsd-wireless@freebsd.org Subject: Re: AR5416 beacon issue. Message-ID: <CAJ-VmomSNinEa%2BEgNnaFQLMDRxkY72DffXdzUQ-=LL2v0FF-gg@mail.gmail.com> In-Reply-To: <CAHjFwoC%2BH91gXOE1V7sYtH3fQHNuSPK5=W=y_5_hQAYUYPa7Rw@mail.gmail.com> References: <CAHjFwoCVwRNyJ_jCgthWFvi%2Bh%2B7xy6-bt=hDrhimMVHS7--dtQ@mail.gmail.com> <CAHjFwoC%2BH91gXOE1V7sYtH3fQHNuSPK5=W=y_5_hQAYUYPa7Rw@mail.gmail.com>
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That's a great catch. So from memory:
* there are bits that control whether the MAC generates sequence numbers or=
not;
* the frame type in the TX descriptor can also modify that.
AR5416:
* D_MISC for each DCU, bit 20: Sequence number increment disable; resets to=
0x0.
* MAC_PCU_STA_ADDR_U16 - (0x8004) bit 29: REG_PRESERVE_SEQNUM: Stops
PCU from replacing the sequence number
AR5212:
* D_MISC: same deal: bit 20 - SEQNUMINCDIS
* same deal with MAC_PCU_STA_ADDR_U16 above: bit 29
30 seconds with the HAL has shown what's going on:
ar5416Reset():
/*
* disable seq number generation in hw
*/
OS_REG_WRITE(ah, AR_STA_ID1,
OS_REG_READ(ah, AR_STA_ID1) | AR_STA_ID1_PRESERVE_SEQNUM);
That bit isn't set for the AR5212.
Try disabling that, see if it works on the AR5416.
If it does, then we should (all) have a brief discussion what the
"correct" behaviour is moving forward.
Adrian
On 23 August 2011 17:37, Kang Yin Su <cantona@cantona.net> wrote:
> Hi all,
> OK, this patch fix the beacons sequence number from AR5416 chips. With th=
is
> code added, both beacons send from AR5212 and AR5416 chips are fine, the
> sequence numbers are increase by 1. I have no idea why the AR5212 chips d=
o
> not this require this. The AR5212 hardware probably ignore this field and
> added the seq no. by itself?
> Thanks,
> Yin
> On Tue, Aug 23, 2011 at 3:50 PM, Kang Yin Su <cantona@cantona.net> wrote:
>>
>> Hi All,
>> Using FreeBSD HEAD create a AP, found that the beacon frames have no
>> sequence number on AR5416 WiFi card, however there is sequence number on
>> AR5212 WiFi card. Attached is the WiFi capture on both =A0 =A0card.
>> =A000:1b:b1:59:ab:4d is AR5416 and 00:0b:6b:2d:f2:cc is AR5212.
>> Thanks,
>> Yin
>
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