netdev - Re: [PATCH net-next 09/16] sky2: Don't receive packets when the napi budget == 0

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Date:	Fri, 14 Mar 2014 18:34:36 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
	netdev@...r.kernel.org, xiyou.wangcong@...il.com, mpm@...enic.com,
	satyam.sharma@...il.com
Subject: Re: [PATCH net-next 09/16] sky2: Don't receive packets when the
 napi budget == 0

On Fri, 14 Mar 2014 18:05:26 -0700
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> 
> Processing any incoming packets with a with a napi budget of 0
> is incorrect driver behavior.
> 
> This matters as netpoll will shortly call drivers with a budget of 0
> to avoid receive packet processing happening in hard irq context.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  drivers/net/ethernet/marvell/sky2.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
> index 2434611d1b4e..0ddfc43069ba 100644
> --- a/drivers/net/ethernet/marvell/sky2.c
> +++ b/drivers/net/ethernet/marvell/sky2.c
> @@ -2735,6 +2735,9 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
>  	unsigned int total_bytes[2] = { 0 };
>  	unsigned int total_packets[2] = { 0 };
>  
> +	if (to_do <= 0)
> +		return work_done;
> +
>  	rmb();
>  	do {
>  		struct sky2_port *sky2;


I am fine with this.

Really should change to_do to an unsigned but that is another
battle.
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