linux-kernel - Re: [PATCH net-next v4 8/9] xen-netback: Timeout packets in RX path

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Date:	Thu, 16 Jan 2014 00:03:34 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	<ian.campbell@...rix.com>, <wei.liu2@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <jonathan.davies@...rix.com>
Subject: Re: [PATCH net-next v4 8/9] xen-netback: Timeout packets in RX path

On Tue, Jan 14, 2014 at 08:39:54PM +0000, Zoltan Kiss wrote:
[...]
> diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
> index 109c29f..d1cd8ce 100644
> --- a/drivers/net/xen-netback/common.h
> +++ b/drivers/net/xen-netback/common.h
> @@ -129,6 +129,9 @@ struct xenvif {
>  	struct xen_netif_rx_back_ring rx;
>  	struct sk_buff_head rx_queue;
>  	RING_IDX rx_last_skb_slots;

Hmm... You seemed to mix your other patch with this series. :-)

> +	bool rx_queue_purge;
> +
> +	struct timer_list wake_queue;
>  
>  	/* This array is allocated seperately as it is large */
>  	struct gnttab_copy *grant_copy_op;
> @@ -225,4 +228,7 @@ void xenvif_idx_unmap(struct xenvif *vif, u16 pending_idx);
>  
>  extern bool separate_tx_rx_irq;
>  
[...]
> @@ -559,7 +579,7 @@ void xenvif_free(struct xenvif *vif)
>  		if (vif->grant_tx_handle[i] != NETBACK_INVALID_HANDLE) {
>  			unmap_timeout++;
>  			schedule_timeout(msecs_to_jiffies(1000));
> -			if (unmap_timeout > 9 &&
> +			if (unmap_timeout > ((rx_drain_timeout_msecs/1000) * DIV_ROUND_UP(XENVIF_QUEUE_LENGTH, (XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS))) &&

This line is really too long. And what's the rationale behind this long
expression?

Wei.
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