linux-kernel - Re: [PATCH net-next v3 6/9] xen-netback: Handle guests with too many frags

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Message-ID: <52CD5785.4050402@citrix.com>
Date:	Wed, 8 Jan 2014 13:49:57 +0000
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Eric Dumazet <eric.dumazet@...il.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 v3 6/9] xen-netback: Handle guests with too many
 frags

On 08/01/14 02:12, Eric Dumazet wrote:
> On Wed, 2014-01-08 at 00:10 +0000, Zoltan Kiss wrote:
>
>>
>> +		if (skb_shinfo(skb)->frag_list) {
>> +			nskb = skb_shinfo(skb)->frag_list;
>> +			xenvif_fill_frags(vif, nskb, INVALID_PENDING_IDX);
>> +			skb->len += nskb->len;
>> +			skb->data_len += nskb->len;
>> +			skb->truesize += nskb->truesize;
>> +			skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
>> +			skb_shinfo(nskb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
>> +			vif->tx_zerocopy_sent += 2;
>> +			nskb = skb;
>> +
>> +			skb = skb_copy_expand(skb,
>> +					0,
>> +					0,
>> +					GFP_ATOMIC | __GFP_NOWARN);
>
> skb can be NULL here

Thanks, fixed that.

Zoli


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