linux-kernel - Re: [PATCH wireless 5/5] wifi: b43: Support advertising lack of QoS capability

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Date: Sat, 30 Dec 2023 17:10:26 +0000
From: Rahul Rameshbabu <sergeantsagara@...tonmail.com>
To: Michael Büsch <m@...s.ch>
Cc: Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org, b43-dev@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH wireless 5/5] wifi: b43: Support advertising lack of QoS capability

On Sat, 30 Dec, 2023 14:45:23 +0100 Michael Büsch <m@...s.ch> wrote:
> [[PGP Signed Part:Undecided]]
> On Sat, 30 Dec 2023 04:51:51 +0000
> Rahul Rameshbabu <sergeantsagara@...tonmail.com> wrote:
>
>> bcm4331 appears to lack QoS support.
>
> I think that's rather unlikely.
> The firmware probably is just too old for this device.

I just retested with newer firmware released on 2012-08-15. I still see
the same issue with QoS. This appears to be the newest firmware I can
acquire from http://lwfinger.com/b43-firmware/, which I extract from
broadcom-wl-6.30.163.46.

    [   11.661972] b43-phy0: Loading firmware version 784.2 (2012-08-15 21:35:19)
    [   11.919942] b43-phy0: Loading firmware version 784.2 (2012-08-15 21:35:19)
    [   13.717460] [drm] amdgpu kernel modesetting enabled.
    [   13.717705] amdgpu: Virtual CRAT table created for CPU
    [   13.717719] amdgpu: Topology: Add CPU node
    [   13.776896] NET: Registered PF_PACKET protocol family
    [   15.234058] b43-phy0: Loading firmware version 784.2 (2012-08-15 21:35:19)
    [   15.319388] wlp3s0b1: authenticate with 1c:87:2c:6f:f4:e0
    [   15.333239] wlp3s0b1: send auth to 1c:87:2c:6f:f4:e0 (try 1/3)
    [   15.341672] wlp3s0b1: authenticated
    [   15.341921] wlp3s0b1: associate with 1c:87:2c:6f:f4:e0 (try 1/3)
    [   15.346912] wlp3s0b1: RX AssocResp from 1c:87:2c:6f:f4:e0 (capab=0x411 status=0 aid=3)
    [   15.347255] wlp3s0b1: associated

>
>> +static const u16 b43_no_qos_chip_ids[] = {
>> +	BCMA_CHIP_ID_BCM4331,
>> +	0,
>> +};
>> +
>> +static bool b43_qos_not_supported(struct b43_wldev *dev)
>> +{
>> +	int idx;
>> +
>> +	for (idx = 0; b43_no_qos_chip_ids[idx]; idx++)
>> +		if (dev->dev->chip_id == b43_no_qos_chip_ids[idx])
>> +			return true;
>> +
>> +	return false;
>> +}
>> +
>>  static void b43_wireless_core_exit(struct b43_wldev *dev);
>>  static int b43_wireless_core_init(struct b43_wldev *dev);
>>  static struct b43_wldev * b43_wireless_core_stop(struct b43_wldev *dev);
>> @@ -2587,7 +2603,7 @@ static void b43_request_firmware(struct work_struct *work)
>>  
>>  start_ieee80211:
>>  	wl->hw->queues = B43_QOS_QUEUE_NUM;
>> -	if (!modparam_qos || dev->fw.opensource)
>> +	if (!modparam_qos || dev->fw.opensource || b43_qos_not_supported(wl->current_dev))
>
> This looks a bit over-engineered to me.
> Can we just instead do it like this, please?
>
> 	if (!modparam_qos || dev->fw.opensource || dev->dev->chip_id == BCMA_CHIP_ID_BCM4331)
>

Ack.

>>  		wl->hw->queues = 1;
>>  
>>  	err = ieee80211_register_hw(wl->hw);

--
Thanks,

Rahul Rameshbabu