netdev - Re: [PATCH net-next v7] bonding: Add independent control state machine

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Date: Tue, 6 Feb 2024 17:27:37 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Aahil Awatramani <aahila@...gle.com>
Cc: David Dillow <dave@...dillows.org>,
	Mahesh Bandewar <maheshb@...gle.com>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Martin KaFai Lau <martin.lau@...nel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v7] bonding: Add independent control state
 machine

On Fri, Feb 02, 2024 at 05:58:58PM +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.
> 
> 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.
> 
> Added new functions such as bond_set_slave_tx_disabled_flags and
> bond_set_slave_rx_enabled_flags to precisely manage the port's collecting
> and distributing states. Previously, there was no dedicated method to
> disable TX while keeping RX enabled, which this patch addresses.
> 
> Note that the regular flow process in the kernel's bonding driver remains
> unaffected by this patch. The extension requires explicit opt-in by the
> user (in order to ensure no disruptions for existing setups) via netlink
> support using the new bonding parameter coupled_control. The default value
> for coupled_control is set to 1 so as to preserve existing behaviour.
> 
> Signed-off-by: Aahil Awatramani <aahila@...gle.com>

Reviewed-by: Hangbin Liu <liuhangbin@...il.com>