netdev - Re: [PATCH net-next v2] bonding: 802.3ad replace MAC_ADDRESS_EQUAL with __agg_has

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Message-ID: <ZdhNxWivTVixYRFK@Laptop-X1>
Date: Fri, 23 Feb 2024 15:48:21 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Jones Syue 薛懷宗 <jonessyue@...p.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"j.vosburgh@...il.com" <j.vosburgh@...il.com>,
	"andy@...yhouse.net" <andy@...yhouse.net>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"corbet@....net" <corbet@....net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] bonding: 802.3ad replace MAC_ADDRESS_EQUAL
 with __agg_has_partner

Hi Jones,
On Fri, Feb 23, 2024 at 04:12:00AM +0000, Jones Syue 薛懷宗 wrote:
> They are verifying the same thing: if aggregator has a partner or not.
> Replaces macro with inline function would look more clear to understand.

MAC_ADDRESS_EQUAL and __agg_has_partner are not the same thing.

MAC_ADDRESS_EQUAL() is only same with __agg_has_partner() when verifying
agg partner mac addr with null_mac_addr. The description could be more
accurate.

Since you want to replace the null_mac_addr checking for MAC_ADDRESS_EQUAL().
Maybe we can also replace the null_mac_addr checking in
ad_port_selection_logic(). This should be safe as the
aggregator->partner_system and port->partner_oper.system has been compared.
e.g.

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index f2942e8c6c91..bd46dcb4013c 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1588,7 +1588,7 @@ static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
                     (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
                     (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
                    ) &&
-                   ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
+                   ((__agg_has_partner(aggregator) && /* partner answers */
                      !aggregator->is_individual)  /* but is not individual OR */
                    )
                   ) {

With this the null_mac_addr definition could be removed.

Thanks
Hangbin