Date: Mon, 1 Feb 2010 14:51:37 -0800
From: Stephen Hemminger <shemminger@vyatta.com>
To: Jarek Poplawski <jarkao2@gmail.com>
Cc: Michael Breuer <mbreuer@majjas.com>, David Miller <davem@davemloft.net>,
       akpm@linux-foundation.org, flyboy@gmail.com,
       linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
       Michael Chan <mchan@broadcom.com>, Don Fry <pcnet32@verizon.net>,
       Francois Romieu <romieu@fr.zoreil.com>,
       Matt Carlson <mcarlson@broadcom.com>
Subject: Re: [PATCH v3] sky2:  receive dma mapping error handling
Message-ID: <20100201145137.76d3da35@nehalam>
In-Reply-To: <20100201224639.GA4664@del.dom.local>
References: <20100128153643.0fca3c51@nehalam>
	<4B645EF4.4050701@majjas.com>
	<20100131003449.GA11935@del.dom.local>
	<4B650D53.2010607@majjas.com>
	<4B65D0F9.2020602@majjas.com>
	<4B65FD12.7090101@majjas.com>
	<20100131221835.GA3317@del.dom.local>
	<20100201102018.7b597992@nehalam>
	<20100201212740.GA3289@del.dom.local>
	<20100201142942.710273cf@nehalam>
	<20100201224639.GA4664@del.dom.local>
Organization: Vyatta
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1382
Lines: 39

On Mon, 1 Feb 2010 23:46:39 +0100
Jarek Poplawski <jarkao2@gmail.com> wrote:

> On Mon, Feb 01, 2010 at 02:29:42PM -0800, Stephen Hemminger wrote:
> > On Mon, 1 Feb 2010 22:27:41 +0100
> > Jarek Poplawski <jarkao2@gmail.com> wrote:
> > 
> > > @@ -1038,13 +1035,14 @@ static void tx_init(struct sky2_port *sky2)
> > >  {
> > >  	struct sky2_tx_le *le;
> > >  
> > > -	sky2->tx_prod = sky2->tx_cons = 0;
> > > +	sky2->tx_prod = 0;
> > >  	sky2->tx_tcpsum = 0;
> > >  	sky2->tx_last_mss = 0;
> > >  
> > >  	le = get_tx_le(sky2, &sky2->tx_prod);
> > >  	le->addr = 0;
> > >  	le->opcode = OP_ADDR64 | HW_OWNER;
> > > +	sky2->tx_cons = sky2->tx_prod;
> > >  	sky2->tx_last_upper = 0;
> > >  }
> > 
> > Your change causes the initial element to be skipped. I want
> > it to goto the hardware. It makes sure the upper bits of the
> > first request are set (0).
> 
> I thought "Send high bits if needed" part in sky2_xmit_frame() was
> enough. If it's otherwise than my patch was wrong.
> 

The definition is "high bits are different than the last value".
The code init sets the last value to zero, and initializes the hardware
engine as well.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/