netdev - Re: [RFC PATCH 2/2] rtl8xxxu: Add watchdog to update rate mask by signal strength

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Message-ID: <CAB4CAwf26pdCY7FJA5H7d1aEY2xpjSto4JxARwczmVJ==41yng@mail.gmail.com>
Date:   Fri, 10 May 2019 16:36:51 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Daniel Drake <drake@...lessm.com>
Cc:     Jes Sorensen <jes.sorensen@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>,
        Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [RFC PATCH 2/2] rtl8xxxu: Add watchdog to update rate mask by
 signal strength

On Thu, May 9, 2019 at 7:24 PM Daniel Drake <drake@...lessm.com> wrote:
>
> On Thu, May 9, 2019 at 5:17 PM Chris Chiu <chiu@...lessm.com> wrote:
> > I need the vif because there's seems no easy way to get RSSI. Please
> > suggest if there's any better idea for this. I believe multiple vifs is for AP
> > mode (with more than 1 virtual AP/SSIDs) and the Station+AP coexist
> > mode. But the rtl8xxxu driver basically supports only Station mode.
>
> Yes, the driver only lets you create station interfaces, but it lets
> you create several of them.
> I'm not sure if that is intentional (and meaningful), or if its a bug.
> Maybe you can experiment with multiple station interfaces and see if
> it works in a meaningful way?
>
> Daniel

I've verified that multiple virtual interface can not work simultaneously in
STA mode. I assigned different mac address for different vifs, I can only
bring only one interface up. If I want to bring the second vif up, it always
complains "SIOCSIFFLAGS: Device or resource busy". But I'm sure that
STA vif can coexist with monitor mode vif. So I may need to add the code
login to make the watchdog only work with the vif in STA mode. Then I
can also store vif in the rtl8xxxu_priv structure if we presume it only works
for station mode. Anyone can suggest whether if this assumption is correct
or not?

Chris