linux-kernel - Re: [PATCH] drivers/rxe: improve rxe loopback

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Date:   Thu, 27 Jul 2017 10:04:37 +0300
From:   Moni Shoua <monis@...lanox.com>
To:     Yuval Shaia <yuval.shaia@...cle.com>
Cc:     Marcel Apfelbaum <marcel@...hat.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>
Subject: Re: [PATCH] drivers/rxe: improve rxe loopback

On Wed, Jul 26, 2017 at 10:57 PM, Yuval Shaia <yuval.shaia@...cle.com> wrote:
> On Wed, Jul 26, 2017 at 05:52:48PM +0300, Marcel Apfelbaum wrote:
>> Currently a packet is marked for loopback only if the source and
>> destination address match. This is not enough when multiple
>> gids are present in rxe's gid table and the traffic is
>> from one gid to another.
>>
>> Fix it by marking the packet for loopback if the destination
>> address appears in rxe's gid table.
>>
>> Signed-off-by: Marcel Apfelbaum <marcel@...hat.com>
>
Have you considered using ip_route_output_key() for IPv4 or
ip6_route_output() for IPv6 to decide if  this is a loopback?
For reference you can check the flow starting at  rdma_resolve_ip()