linux-kernel - Re: [ath9k-devel] Patching ath9k/mac80211 to change MAC layer features

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Message-ID: <BANLkTimBVMm34qBWv7bxKwRL17UnLHcazA@mail.gmail.com>
Date:	Tue, 28 Jun 2011 08:14:30 -0400
From:	Daniel Smith <viscous.liquid@...il.com>
To:	Fred Matthews <fredmm@...mail.co.uk>
Cc:	Mohammed Shafi <shafi.wireless@...il.com>,
	ath9k-devel@...ema.h4ckr.net, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org, ath9k-devel@...ts.ath9k
Subject: Re: [ath9k-devel] Patching ath9k/mac80211 to change MAC layer features

On Tue, Jun 28, 2011 at 3:00 AM, Mohammed Shafi
<shafi.wireless@...il.com> wrote:
> On Mon, Jun 27, 2011 at 11:07 PM, Fred Matthews <fredmm@...mail.co.uk> wrote:
>> Hi all,
>>
>> Much appreciated Mohammed Shafi, disabling aggregation works when
>> replacing those lines with
>>  sc->sc_flags &= ~SC_OP_TXAGGR;
>>  sc->sc_flags &= ~SC_OP_RXAGGR;
>> only issue is I must always recompile compat-wireless to
>> re-enable/disable it again. I tried to port it using debugfs to be
>> able to enable and disable at runtime but ath9k kept rebooting.
>
> I am not sure we can enable/disable aggregation via debugfs, these
> flags seem are set at initialization and based on this lot of things
> happen in tx-path, initializing TID structure, ampdu action, rate
> control  etc.
>

The project I am on we have to deal with a situation where we change
the hardware environment and thus have to change some of the
initialization parameters. Obviously the environment is a little
unique, but I believe this should work for you. Before the changes are
made we do a

                if (sc->nvifs > 0) {
                        printk(KERN_INFO "ath9k:card has an open interface\n");
                        return -EBUSY;
                }

                pdev = to_pci_dev(sc->dev);
                pdev->driver->remove(pdev);

then we make our hardware change and  then do a

                pci_id = pci_match_id(pdev->driver->id_table, pdev);
                err = pdev->driver->probe(pdev, pci_id);

which gives us a re-initialized instance of ath_hw and ath_softc for the radio

Hope this helps!

V/r,
Daniel P. Smith
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