netdev - Re: fq_codel and skb->hash

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Message-ID: <CALx6S34ugaCqDtE=-4533mNsPgt_T0oHC1CN0-vx_uga+ihLdQ@mail.gmail.com>
Date:   Mon, 16 Jan 2017 22:18:37 -0800
From:   Tom Herbert <tom@...bertland.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Andrew Collins <acollins@...dlepoint.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: fq_codel and skb->hash

On Mon, Jan 16, 2017 at 6:34 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Mon, 2017-01-16 at 17:44 -0800, Eric Dumazet wrote:
>> On Mon, 2017-01-16 at 17:04 -0700, Andrew Collins wrote:
>
>> >   Is there a better way to manage flow separation in routed+encapsulated traffic?
>>
>> Encapsulated traffic is fine, since flow dissector skips encap header(s)
>> up to the L4 header.
>>
>> Problem is about encrypted traffic, since presumably this L4 header is
>> opaque for flow dissector ;)
>
>
> BTW, how can we make sure skb->hash is populated before IPSEC ?
>
> Relying on forwarding, and skb->hash set by a device might be not
> enough.
>
Should we do skb_get_hash upon entry to IPsec?

Tom

>
>