netdev - Re: [PATCH 2/9] atl1: make driver napi compatible

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Message-ID: <1334337315.2606.7.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Fri, 13 Apr 2012 18:15:15 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Tony Zelenoff <antonz@...allels.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>,
	<jcliburn@...il.com>, <csnook@...hat.com>, <khorenko@...allels.com>
Subject: Re: [PATCH 2/9] atl1: make driver napi compatible

On Fri, 2012-04-13 at 20:09 +0400, Tony Zelenoff wrote:
> This is first step, here there is no fine interrupt
> disabling which cause TX/ERR interrupts stalling when
> RX scheduled ints processed.
> 
> Signed-off-by: Tony Zelenoff <antonz@...allels.com>
> ---
>  drivers/net/ethernet/atheros/atlx/atl1.c |   46 ++++++++++++++++++++++++++----
>  drivers/net/ethernet/atheros/atlx/atl1.h |    1 +
>  2 files changed, 41 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/atheros/atlx/atl1.c b/drivers/net/ethernet/atheros/atlx/atl1.c
> index 6438239..d39c1b9 100644
> --- a/drivers/net/ethernet/atheros/atlx/atl1.c
> +++ b/drivers/net/ethernet/atheros/atlx/atl1.c
> @@ -1917,7 +1917,7 @@ next:
>  	return num_alloc;
>  }
>  
> -static void atl1_intr_rx(struct atl1_adapter *adapter)
> +static int atl1_intr_rx(struct atl1_adapter *adapter, int budget)
>  {
>  	int i, count;
>  	u16 length;
> @@ -1933,7 +1933,7 @@ static void atl1_intr_rx(struct atl1_adapter *adapter)
>  
>  	rrd_next_to_clean = atomic_read(&rrd_ring->next_to_clean);
>  
> -	while (1) {
> +	while (count <= budget) {
[...]

Off by one; the test should be count < budget.  Otherwise you can exit
with count == budget + 1 and net_rx_action() will WARN you about that.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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