netdev - Re: [PATCH] netpoll: fix TX queue overflow in trapped mode

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Message-Id: <200704290025.41760.sshtylyov@ru.mvista.com>
Date:	Sun, 29 Apr 2007 00:25:41 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] netpoll: fix TX queue overflow in trapped mode

On Saturday 28 April 2007 22:52, I wrote:

> > CONFIG_NETPOLL_TRAP causes the TX queue controls to be completely
> > bypassed in the netpoll's "trapped" mode which easily causes overflows in
> > the drivers with short TX queues (most notably, in 8139too with its
> > 4-deep queue).  So, make this option more sensible by making it only
> > bypass the TX softirq wakeup.
>    Dammit!  Finally forgot to add acks earned so far:

   Oh, and there was even another one:

> > Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>

> Acked-by: Jeff Garzik <jgarzik@...ox.com>
Acked-by: Tom Rini <trini@...nel.crashing.org>
> Acked-by: Matt Mackall <mpm@...enic.com>

> > ---
> > Split this part form the initial patch as request by Matt Mackall.
> >
> >  include/linux/netdevice.h |    8 +++-----
> >  2 files changed, 3 insertions(+), 10 deletions(-)
> >
> > Index: linux-2.6/include/linux/netdevice.h
> > ===================================================================
> > --- linux-2.6.orig/include/linux/netdevice.h
> > +++ linux-2.6/include/linux/netdevice.h
> > @@ -647,8 +647,10 @@ static inline void netif_start_queue(str
> >  static inline void netif_wake_queue(struct net_device *dev)
> >  {
> >  #ifdef CONFIG_NETPOLL_TRAP
> > -	if (netpoll_trap())
> > +	if (netpoll_trap()) {
> > +		clear_bit(__LINK_STATE_XOFF, &dev->state);
> >  		return;
> > +	}
> >  #endif
> >  	if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
> >  		__netif_schedule(dev);
> > @@ -656,10 +658,6 @@ static inline void netif_wake_queue(stru
> >
> >  static inline void netif_stop_queue(struct net_device *dev)
> >  {
> > -#ifdef CONFIG_NETPOLL_TRAP
> > -	if (netpoll_trap())
> > -		return;
> > -#endif
> >  	set_bit(__LINK_STATE_XOFF, &dev->state);
> >  }

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