netdev - Re: [PATCH net-next] net: Support ip route get via given table

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Date:	Wed, 2 Sep 2015 13:50:27 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: Support ip route get via given table

On 9/2/15 1:38 PM, Thomas Graf wrote:
> On 09/02/15 at 01:22pm, David Ahern wrote:
>> On 9/2/15 1:12 PM, Thomas Graf wrote:
>>> On 09/02/15 at 12:03pm, David Ahern wrote:
>>>> Add support for 'ip [-6] route get table X' where the user wants to
>>>> force the FIB lookup from a given table.
>>>>
>>>> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
>>>
>>> Will you use this outside of 'ip route get' as well? If so, how? I'm
>>> asking because you propose to add the check and new behaviour to bypass
>>> the routing rules to the routing fastpath, wouldn't it be better to
>>> handle this in inet_rtm_getroute()?
>>>
>>
>> The way IPv6 code is structured it seemed more appropriate to pass in a
>> table id as part of the flow. I made IPv4 consistent with that approach.
>
> The question is: Are you planning to use the new table_id in flowi
> in the actual datapath as well? It seems entirely wrong to add
> weight to the fast path for a control plane feature.
>

No plans at the moment.
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