netdev - Re: [PATCH net-next V5 6/9] Altera TSE: Add main and header file for Altera Ethernet Driver

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Date:	Fri, 14 Mar 2014 13:52:04 -0500
From:	Vince Bridgers <vbridgers2013@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>
Subject: Re: [PATCH net-next V5 6/9] Altera TSE: Add main and header file for
 Altera Ethernet Driver

Hi Richard,

On Fri, Mar 14, 2014 at 9:39 AM, Richard Cochran
<richardcochran@...il.com> wrote:
> On Fri, Mar 14, 2014 at 09:04:44AM -0500, Vince Bridgers wrote:
>> +static int tse_start_xmit(struct sk_buff *skb, struct net_device *dev)
>> +{
>> +     struct altera_tse_private *priv = netdev_priv(dev);
>> +     unsigned int txsize = priv->tx_ring_size;
>> +     unsigned int entry;
>> +     struct tse_buffer *buffer = NULL;
>> +     int nfrags = skb_shinfo(skb)->nr_frags;
>> +     unsigned int nopaged_len = skb_headlen(skb);
>> +     enum netdev_tx ret = NETDEV_TX_OK;
>> +     dma_addr_t dma_addr;
>> +     int txcomplete = 0;
>> +
>> +     spin_lock_bh(&priv->tx_lock);
>> +
>> +     if (unlikely(tse_tx_avail(priv) < nfrags + 1)) {
>> +             if (!netif_queue_stopped(dev)) {
>> +                     netif_stop_queue(dev);
>> +                     /* This is a hard error, log it. */
>> +                     netdev_err(priv->dev,
>> +                                "%s: Tx list full when queue awake\n",
>> +                                __func__);
>> +             }
>> +             ret = NETDEV_TX_BUSY;
>> +             goto out;
>> +     }
>> +
>> +     /* Map the first skb fragment */
>> +     entry = priv->tx_prod % txsize;
>> +     buffer = &priv->tx_ring[entry];
>> +
>> +     dma_addr = dma_map_single(priv->device, skb->data, nopaged_len,
>> +                               DMA_TO_DEVICE);
>> +     if (dma_mapping_error(priv->device, dma_addr)) {
>> +             netdev_err(priv->dev, "%s: DMA mapping error\n", __func__);
>> +             ret = NETDEV_TX_OK;
>> +             goto out;
>> +     }
>> +
>> +     buffer->skb = skb;
>> +     buffer->dma_addr = dma_addr;
>> +     buffer->len = nopaged_len;
>> +
>> +     /* Push data out of the cache hierarchy into main memory */
>> +     dma_sync_single_for_device(priv->device, buffer->dma_addr,
>> +                                buffer->len, DMA_TO_DEVICE);
>> +
>> +     txcomplete = priv->dmaops->tx_buffer(priv, buffer);
>> +
>> +     priv->tx_prod++;
>> +     dev->stats.tx_bytes += skb->len;
>
> This could use a call to skb_tx_timestamp() somewhere around here.

Thank you, I'll add the call

>
>> +
>> +     if (unlikely(tse_tx_avail(priv) <= TXQUEUESTOP_THRESHHOLD)) {
>> +             if (netif_msg_hw(priv))
>> +                     netdev_dbg(priv->dev, "%s: stop transmitted packets\n",
>> +                                __func__);
>> +             netif_stop_queue(dev);
>> +     }
>> +
>> +out:
>> +     spin_unlock_bh(&priv->tx_lock);
>> +
>> +     return ret;
>> +}
>
> Thanks,
> Richard

All the best,

Vince
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