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

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Message-Id: <200704282252.01296.sshtylyov@ru.mvista.com>
Date:	Sat, 28 Apr 2007 22:52:01 +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 22:12, you 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:

> Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>
Acked-by: Jeff Garzik <jgarzik@...ox.com>
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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