netdev - Re: [PATCH] netdev: pktgen xmit packet through vlan interface

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Date:	Sat, 3 May 2014 08:58:31 +0800
From:	Zhouyi Zhou <zhouzhouyi@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	David Miller <davem@...emloft.net>, steffen.klassert@...unet.com,
	fan.du@...driver.com, dborkman@...hat.com,
	Mathias Krause <minipli@...glemail.com>, tgraf@...g.ch,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Zhouyi Zhou <yizhouzhou@....ac.cn>
Subject: Re: [PATCH] netdev: pktgen xmit packet through vlan interface

Thank Sergei for reviewing.

I think
On Sat, May 3, 2014 at 12:18 AM, Sergei Shtylyov
<sergei.shtylyov@...entembedded.com> wrote:

>> +
>> +       if (pkt_dev->clone_skb && is_vlan_dev(odev)) {
>> +               nskb = skb_clone(pkt_dev->skb, GFP_ATOMIC);
>> +               ret = -ENOMEM;
>> +               if (nskb)
>> +                       ret = (*xmit)(nskb, odev);
if (is_vlan_dev(odev) && pkt_dev->clone_skb) {
        nskb = skb_clone(pkt_dev->skb, GFP_ATOMIC);
        ret = -ENOMEM;
        if (nskb)
             ret = (*xmit)(nskb, odev);
}
>
and

case NETDEV_TX_LOCKED:
case NETDEV_TX_BUSY:
     /* Retry it next time */
     atomic_dec(&(pkt_dev->skb->users));
     if (is_vlan_dev(odev) && pkt_dev->clone_skb && nskb)
                 kfree_skb(nskb);
     else
                 atomic_dec(&(pkt_dev->skb->users));

is better, because is_vlan_dev(odev) is probably in  read most cache line.

Zhouyi
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