linux-kernel - Re: [PATCH net v2] ipv6: omit traffic class when calculating flow hash

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Date:   Sat, 2 Jun 2018 14:33:38 -0600
From:   David Ahern <dsahern@...il.com>
To:     Michal Kubecek <mkubecek@...e.cz>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Tom Herbert <tom@...bertland.com>,
        Ido Schimmel <idosch@...sch.org>
Subject: Re: [PATCH net v2] ipv6: omit traffic class when calculating flow
 hash

On 6/2/18 1:40 AM, Michal Kubecek wrote:
> Some of the code paths calculating flow hash for IPv6 use flowlabel member
> of struct flowi6 which, despite its name, encodes both flow label and
> traffic class. If traffic class changes within a TCP connection (as e.g.
> ssh does), ECMP route can switch between path. It's also incosistent with
> other code paths where ip6_flowlabel() (returning only flow label) is used
> to feed the key.
> 
> Use only flow label everywhere, including one place where hash key is set
> using ip6_flowinfo().
> 
> Fixes: 51ebd3181572 ("ipv6: add support of equal cost multipath (ECMP)")
> Fixes: f70ea018da06 ("net: Add functions to get skb->hash based on flow structures")
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
> ---
> v2: introduce and use an inline helper as suggested by David Ahern
> 
>  include/net/ipv6.h        | 5 +++++
>  net/core/flow_dissector.c | 2 +-
>  net/ipv6/route.c          | 4 ++--
>  3 files changed, 8 insertions(+), 3 deletions(-)
> 

Acked-by: David Ahern <dsahern@...il.com>