netdev - Re: [RFC PATCH net-next 5/6] virtio-net: enable tx interrupt

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Date:	Wed, 15 Oct 2014 02:37:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [RFC PATCH net-next 5/6] virtio-net: enable tx interrupt

On Wed, 2014-10-15 at 15:25 +0800, Jason Wang wrote:

...

> +static int free_old_xmit_skbs(struct send_queue *sq, int budget)
> +{
> +	struct sk_buff *skb;
> +	unsigned int len;
> +	struct virtnet_info *vi = sq->vq->vdev->priv;
> +	struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
> +	u64 tx_bytes = 0, tx_packets = 0;
> +
> +	while (tx_packets < budget &&
> +	       (skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
> +		pr_debug("Sent skb %p\n", skb);
> +
> +		tx_bytes += skb->len;
> +		tx_packets++;
> +
> +		dev_kfree_skb_any(skb);
> +	}
> +
> +	u64_stats_update_begin(&stats->tx_syncp);
> +	stats->tx_bytes += tx_bytes;
> +	stats->tx_packets =+ tx_packets;

	
	stats->tx_packets += tx_packets;

> +	u64_stats_update_end(&stats->tx_syncp);
> +
> +	return tx_packets;
> +}

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