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Message-ID: <92cbf512c4a1b80c577eeb25ad0d69985608e14b.camel@redhat.com>
Subject: Re: [PATCH net-next v6] bonding: Add independent control state
 machine
From: Paolo Abeni <pabeni@redhat.com>
To: Jay Vosburgh <jay.vosburgh@canonical.com>
Cc: Aahil Awatramani <aahila@google.com>, David Dillow
 <dave@thedillows.org>,  Mahesh Bandewar <maheshb@google.com>, Hangbin Liu
 <liuhangbin@gmail.com>, Andy Gospodarek <andy@greyhouse.net>,  "David S .
 Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub
 Kicinski <kuba@kernel.org>, Martin KaFai Lau <martin.lau@kernel.org>,
 Herbert Xu <herbert@gondor.apana.org.au>, Daniel Borkmann
 <daniel@iogearbox.net>,  netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org
Date: Thu, 01 Feb 2024 15:52:07 +0100
In-Reply-To: <32424.1706798605@famine>
References: <20240129202741.3424902-1-aahila@google.com>
	 <15d7f2941394e04d45f98aa6d095b1e07262655c.camel@redhat.com>
	 <32424.1706798605@famine>
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On Thu, 2024-02-01 at 06:43 -0800, Jay Vosburgh wrote:
> Paolo Abeni <pabeni@redhat.com> wrote:
>=20
> > On Mon, 2024-01-29 at 20:27 +0000, Aahil Awatramani wrote:
> > > Add support for the independent control state machine per IEEE
> > > 802.1AX-2008 5.4.15 in addition to the existing implementation of the
> > > coupled control state machine.
> > >=20
> > > Introduces two new states, AD_MUX_COLLECTING and AD_MUX_DISTRIBUTING =
in
> > > the LACP MUX state machine for separated handling of an initial
> > > Collecting state before the Collecting and Distributing state. This
> > > enables a port to be in a state where it can receive incoming packets
> > > while not still distributing. This is useful for reducing packet loss=
 when
> > > a port begins distributing before its partner is able to collect.
> >=20
> > If I read the code correctly, the transition
> > AD_MUX_COLLECTING_DISTRIBUTING -> AD_MUX_DISTRIBUTING is not possible,
> > am I correct?
>=20
> 	That's correct.  There are two completely separate state
> machines in the 2008 standard, one for coupled control and one for
> independent control.  The state machines utilize the same states other
> than COLLECTING_DISTRIBUTING in the coupled control mode, and COLLECTING
> and DISTRIBUTING in the independent control mode.
>=20
> 	Essentially, the two machines differ in the transition out from
> ATTACHED state; coupled control moves to COLLECTING_DISTRIBUTING,
> whereas independent control moves to COLLECTING then DISTRIBUTING. =20
>=20
> 	The 2020 edition of the standard combines the two state machines
> into one, and changes the set of states.  Bonding does not implement
> this version of the standard.

Thanks for the clarification, given that the patch LGTM!

Acked-by: Paolo Abeni <pabeni@redhat.com>