netdev - Re: dev_loopback

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Message-ID: <8540fdf9-4aba-28e9-9347-fd061997fba1@gmail.com>
Date:   Tue, 24 Apr 2018 01:11:03 +0200
From:   Emanuele <e.emanuelegiuseppe@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: dev_loopback_xmit parameters

Ok, clear now.

Even though I don't understand what to set to avoid triggering the
WARN_ON(!skb_dst(skb));
inside dev_loopback_xmit.
I just would like to send the skb in loopback, i.e. moving the packet 
from the sending to the receiving queue of a certain struct net_device.


On 24/04/2018 00:36, Eric Dumazet wrote:
>
> On 04/23/2018 02:40 PM, Emanuele wrote:
>> Hello,
>>
>> I don't know if this is the right place where to ask, but I was wondering why the dev_loopback_xmit function defined in /net/core/dev.c takes struct net * and struct sock *  as parameters. They are never used, so I believe passing only the struct  sk_buff * should be enough.
>>
> Look at net/ipv6/ip6_output.c where NF_HOOK() uses dev_loopback_xmit().
>
>> In addition, it would like to know where I can read what is and how to set a skb dst_entry, since I don't really understand it.
>>
>> Thanks a lot,
>>
>> Emanuele
>>