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

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Date:   Tue, 11 May 2021 22:58:26 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, 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 Tue, May 11, 2021 at 09:10:46AM -0600, David Ahern wrote:
> 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.

OK