netdev - Re: [PATCH v3 net-next 4/4] net/sched: act

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Date:   Thu, 6 Oct 2016 06:30:35 -0700
From:   Shmulik Ladkani <shmulik.ladkani@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v3 net-next 4/4] net/sched: act_mirred: Implement ingress actions

Hi,

On Mon, Oct 3, 2016 at 12:45 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Thu, Sep 29, 2016 at 4:03 AM, Shmulik Ladkani
> <shmulik.ladkani@...il.com> wrote:
>>         skb2->skb_iif = skb->dev->ifindex;
>>         skb2->dev = dev;
>> -       err = dev_queue_xmit(skb2);
>> +       if (tcf_mirred_act_direction(m_eaction) & AT_EGRESS)
>> +               err = dev_queue_xmit(skb2);
>> +       else
>> +               netif_receive_skb(skb2);
>
> Any reason why not check the return value here?

Rationale: netif_receive_skb returns err if there was no protocol
handler to deliver the skb to.
If skb is not caught by any protocol handler, this should not be
considered an "ingress redirect" error. The redirect action should be
considered successful.