netdev - Re: [RFC PATCH net-next v2 02/10] ipv4: Add a sysctl to control multipath hash fields

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Message-ID: <59331028-c1a5-2a7a-1e27-57e62f95030f@gmail.com>
Date:   Tue, 11 May 2021 09:10:46 -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 v2 02/10] ipv4: Add a sysctl to control
 multipath hash fields

On 5/9/21 9:16 AM, Ido Schimmel wrote:
> diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
> index c2ecc9894fd0..15982f830abc 100644
> --- a/Documentation/networking/ip-sysctl.rst
> +++ b/Documentation/networking/ip-sysctl.rst
> @@ -100,6 +100,33 @@ fib_multipath_hash_policy - INTEGER
>  	- 1 - Layer 4
>  	- 2 - Layer 3 or inner Layer 3 if present
>  
> +fib_multipath_hash_fields - UNSIGNED INTEGER
> +	When fib_multipath_hash_policy is set to 3 (custom multipath hash), the
> +	fields used for multipath hash calculation are determined by this
> +	sysctl.
> +
> +	This value is a bitmask which enables various fields for multipath hash
> +	calculation.
> +
> +	Possible fields are:
> +
> +	====== ============================
> +	0x0001 Source IP address
> +	0x0002 Destination IP address
> +	0x0004 IP protocol
> +	0x0008 Unused

Document that this bit is flowlabel for IPv6 and ignored for ipv4.