netdev - Re: [PATCH v15 ] net/veth/XDP: Line-rate packet forwarding in kernel

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Date:   Tue, 10 Apr 2018 00:27:31 -0400
From:   "Md. Islam" <mislam4@...t.edu>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Anton Gary Ceph <agaceph@...il.com>,
        Pavel Emelyanov <xemul@...nvz.org>,
        Eric Dumazet <edumazet@...gle.com>,
        alexei.starovoitov@...il.com,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH v15 ] net/veth/XDP: Line-rate packet forwarding in kernel

Gotcha. I'm working on it. I've created a function that creates
sk_buff from xdp_buff. But still getting an error while the sk_buff is
being processed by tcp. I will send you the patch once I'm done.

Thanks!

On Thu, Apr 5, 2018 at 10:55 PM, David Ahern <dsahern@...il.com> wrote:
> On 4/3/18 9:15 PM, Md. Islam wrote:
>>> Have you looked at what I would consider a more interesting use case of
>>> packets into a node and delivered to a namespace via veth?
>>>
>>>    +--------------------------+---------------
>>>    | Host                     | container
>>>    |                          |
>>>    |        +-------{ veth1 }-|-{veth2}----
>>>    |       |                  |
>>>    +----{ eth1 }------------------
>>>
>>> Can xdp / bpf on eth1 be used to speed up delivery to the container?
>>
>> I didn't consider that, but it sounds like an important use case. How
>> do we determine which namespace gets the packet?
>>
>
> FIB lookups of course. Starting with my patch set that handles
> forwarding on eth1, what is needed for XDP with veth? ie., a program on
> eth1 does the lookup and redirects the packet to veth1 for Tx.
> ndo_xdp_xmit for veth knows the packet needs to be forwarded to veth2
> internally and there is no skb allocated for the packet yet.



-- 
Tamim
PhD Candidate,
Kent State University
http://web.cs.kent.edu/~mislam4/