netdev - RE: [PATCH v2] sis900: Fix the tx queue timeout issue

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Date:	Thu, 1 Aug 2013 15:50:51 +0000
From:	Duan Fugang-B38611 <B38611@...escale.com>
To:	Denis Kirjanov <kda@...ux-powerpc.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"venza@...wnhat.org" <venza@...wnhat.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v2] sis900: Fix the tx queue timeout issue

On Thursday, August 01, 2013 at 3:01 PM, Denis Kirjanov wrote:

> @@ -1613,9 +1613,12 @@ sis900_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
> 	unsigned int  count_dirty_tx;
> 
> 	/* Don't transmit data before the complete of auto-negotiation */
> -	if(!sis_priv->autong_complete){
> -		netif_stop_queue(net_dev);
> -		return NETDEV_TX_BUSY;
> +	if (unlikely(!sis_priv->autong_complete)) {
> +		if (netif_msg_tx_err(sis_priv) && net_ratelimit())
> +			netdev_dbg(net_dev, "Auto negotiation in progress\n");
> +		net_dev->stats.tx_dropped++;
> +		dev_kfree_skb(skb);
> +		return NETDEV_TX_OK;
>  	}

I always insist on that tx queue timeout is caused by un-correctly phy link handler flow.
The link up handler flow: Auto-negotiation done-> netif_carrier_on()
 
The issue cannot be processed in xmit callback, which must be handled in link adjust process.

Thanks,
Andy

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