netdev - Re: removing the timer from cdc-ncm

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Message-ID: <9022066.PsM0uBqIB8@linux-lqwf.site>
Date:	Wed, 26 Sep 2012 10:57:12 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Alexey ORISHKO <alexey.orishko@...ricsson.com>
Cc:	"bjorn@...k.no" <bjorn@...k.no>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: removing the timer from cdc-ncm

On Tuesday 25 September 2012 13:18:10 Alexey ORISHKO wrote:
> > -----Original Message-----
> > From: Oliver Neukum [mailto:oneukum@...e.de]
> > 
> > here is the patch that does everything I consider theoretically
> > necessary to have bundling of frames in usbnet and adapting cdc-ncm to
> > it.
> > 
> > I'd appreciate any review in case I am doing something stupid.
> > 
> 
> I had a brief look at cdc_ncm and a few corrections needed:
> - remove the following:
> #include <linux/hrtimer.h>
> ...
> /* Restart the timer, if amount of datagrams is less than given value */
> #define	CDC_NCM_RESTART_TIMER_DATAGRAM_CNT	3
> #define	CDC_NCM_TIMER_PENDING_CNT		2
> #define CDC_NCM_TIMER_INTERVAL			(400UL * NSEC_PER_USEC)
> ...
> In struct cdc_ncm_ctx {
> ...
> 	struct hrtimer tx_timer;
> 	struct tasklet_struct bh;
> ...
> 
> In cdc_ncm_unbind():
> 	if (hrtimer_active(&ctx->tx_timer))
> 		hrtimer_cancel(&ctx->tx_timer);
> 
> 	tasklet_kill(&ctx->bh);

Roger

> I didn't have time to check the new logic for data path, but I've
> tried to run it on Ubuntu 12.04.
> Linux host got panic right after data path has been established
> (i.e. connected to mobile network). 

Thank you. Worse than I hoped, but not unexpected. I'll stare at the
code a bit.

	Regards
		Oliver

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