netdev - Re: [PATCH net-next v4] net: ipv4: add support for ECMP hash policy choice

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Date:   Tue, 21 Mar 2017 15:28:27 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     nikolay@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        dsa@...ulusnetworks.com, jkbs@...hat.com, edumazet@...gle.com,
        pch@...bogen.com, stephen@...workplumber.org,
        nicolas.dichtel@...nd.com
Subject: Re: [PATCH net-next v4] net: ipv4: add support for ECMP hash
 policy choice

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Date: Thu, 16 Mar 2017 15:28:00 +0200

> This patch adds support for ECMP hash policy choice via a new sysctl
> called fib_multipath_hash_policy and also adds support for L4 hashes.
> The current values for fib_multipath_hash_policy are:
>  0 - layer 3 (default)
>  1 - layer 4
> If there's an skb hash already set and it matches the chosen policy then it
> will be used instead of being calculated (currently only for L4).
> In L3 mode we always calculate the hash due to the ICMP error special
> case, the flow dissector's field consistentification should handle the
> address order thus we can remove the address reversals.
> If the skb is provided we always use it for the hash calculation,
> otherwise we fallback to fl4, that is if skb is NULL fl4 has to be set.
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Applied, thanks Nikolay.