netdev - Re: Load Balancing for AF

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Message-ID: <CAPBAu3XWzO5GT1cceVgYCJ2Du_p+yht3moBPuKrn-i_O5yLJvw@mail.gmail.com>
Date:	Thu, 17 Dec 2015 11:40:21 +0530
From:	Prashant Upadhyaya <praupadhyaya@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Load Balancing for AF_INET Raw Sockets

On Tue, Dec 15, 2015 at 8:09 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2015-12-15 at 18:26 +0530, Prashant Upadhyaya wrote:
>> Hi,
>>
>> I open a raw socket for listening to all the UDP packets in a raw fashion --
>>
>> socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
>>
>> Then I use recvfrom to read the packets over the socket.
>>
>> The above works mighty fine.
>> I want to find out if it is possible to 'load balance' the UDP flows
>> by opening up multiple instances of this socket and then possibly
>> setting some socket options so that I can scale up the reading via
>> multiple threads doing recvfrom on these from multiple cores.
>> (I know it is possible over packet sockets, but that is a different usecase)
>
> No plan yet to support fanout on multiple raw sockets.
>
>
Hi,

One question on the AF_INET6 raw sockets.
Here I don't get the ipv6 header at all when I read a packet.
I checked the RFC 3542 and it specifies the following as the ancillary
data which can be obtained --

Four similar pieces of information can be returned for a received
   packet as ancillary data:

      1.  the destination IPv6 address,
      2.  the arriving interface index,
      3.  the arriving hop limit, and
      4.  the arriving traffic class value.

Now how do I obtain the 'src IPv6 address' ?

Regards
-Prashant
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