linux-kernel - Re: [PATCH net-next v3] bonding: add a vlan+srcmac tx hashing option

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Message-ID: <79af4145-48cc-0961-b341-c0e106beb14b@gmail.com>
Date:   Mon, 18 Jan 2021 16:10:38 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jarod Wilson <jarod@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Davis <tadavis@....gov>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3] bonding: add a vlan+srcmac tx hashing option

On 1/15/21 12:21 PM, Jarod Wilson wrote:
> diff --git a/Documentation/networking/bonding.rst b/Documentation/networking/bonding.rst
> index adc314639085..36562dcd3e1e 100644
> --- a/Documentation/networking/bonding.rst
> +++ b/Documentation/networking/bonding.rst
> @@ -951,6 +951,19 @@ xmit_hash_policy
>  		packets will be distributed according to the encapsulated
>  		flows.
>  
> +	vlan+srcmac
> +
> +		This policy uses a very rudimentary vland ID and source mac

s/vland/vlan/

> +		ID hash to load-balance traffic per-vlan, with failover

drop ID on this line; just 'source mac'.


> +		should one leg fail. The intended use case is for a bond
> +		shared by multiple virtual machines, all configured to
> +		use their own vlan, to give lacp-like functionality
> +		without requiring lacp-capable switching hardware.
> +
> +		The formula for the hash is simply
> +
> +		hash = (vlan ID) XOR (source MAC vendor) XOR (source MAC dev)
> +
>  	The default value is layer2.  This option was added in bonding
>  	version 2.6.3.  In earlier versions of bonding, this parameter
>  	does not exist, and the layer2 policy is the only policy.  The