netdev - Re: [PATCH net-next] cxgb4: Add low latency socket busy

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Date:	Wed, 4 Feb 2015 12:21:39 +0600
From:	Kumar Sanghvi <kumaras@...lsio.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Hariprasad Shenai <hariprasad@...lsio.com>,
	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<leedom@...lsio.com>, <anish@...lsio.com>, <nirranjan@...lsio.com>,
	<praveenm@...lsio.com>
Subject: Re: [PATCH net-next] cxgb4: Add low latency socket busy_poll support

On Tuesday, February 02/03/15, 2015 at 21:58:29 -0800, Eric Dumazet wrote:
> On Tue, 2015-02-03 at 10:50 +0530, Hariprasad Shenai wrote:
> 
> > @@ -1978,9 +2016,13 @@ static int napi_rx_handler(struct napi_struct *napi, int budget)
> >  {
> >  	unsigned int params;
> >  	struct sge_rspq *q = container_of(napi, struct sge_rspq, napi);
> > -	int work_done = process_responses(q, budget);
> > +	int work_done = 0;
> >  	u32 val;
> >  
> > +	if (!cxgb_poll_lock_napi(q))
> > +		return work_done;
> > +
> 
> 
> This is very suspicious. Please take a look at commits
> 
> 24e579c8898aa641 ("bnx2x: fix napi poll return value for repoll") 
> f104fedc0da126ab ("enic: fix rx napi poll return value")
> 
> for context.

Thanks Eric for pointing on this.
So, this probably needs change after commit d75b1ade567ffab ("net: less interrupt masking in NAPI"), or
is there something else that is missed ?


Thanks,
Kumar.
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