netdev - Re: [RFC PATCH net-next 03/10] ipv4: Add custom multipath hash policy

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Date:   Mon, 3 May 2021 20:38:36 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, petrm@...dia.com,
        roopa@...dia.com, nikolay@...dia.com, ssuryaextr@...il.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: Re: [RFC PATCH net-next 03/10] ipv4: Add custom multipath hash policy

On 5/2/21 10:22 AM, Ido Schimmel wrote:
> diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
> index 8ab61f4edf02..549601494694 100644
> --- a/Documentation/networking/ip-sysctl.rst
> +++ b/Documentation/networking/ip-sysctl.rst
> @@ -99,6 +99,8 @@ fib_multipath_hash_policy - INTEGER
>  	- 0 - Layer 3
>  	- 1 - Layer 4
>  	- 2 - Layer 3 or inner Layer 3 if present
> +	- 3 - Custom multipath hash. Fields used for multipath hash calculation
> +	  are determined by fib_multipath_hash_fields sysctl
>  

If you default the fields to L3, then seems like the custom option is a
more generic case of '0'.