[PATCH net-next v3] bonding: 802.3ad replace MAC_ADDRESS_EQUAL with __agg_has_partner

[Jones Syue 薛懷宗]

Replace macro MAC_ADDRESS_EQUAL() for null_mac_addr checking with inline
function__agg_has_partner(). When MAC_ADDRESS_EQUAL() is verifiying
aggregator's partner mac addr with null_mac_addr, means that seeing if
aggregator has a valid partner or not. Using __agg_has_partner() makes it
more clear to understand.

In ad_port_selection_logic(), since aggregator->partner_system and
port->partner_oper.system has been compared first as a prerequisite, it is
safe to replace the upcoming MAC_ADDRESS_EQUAL() for null_mac_addr checking
with __agg_has_partner().

Delete null_mac_addr, which is not required anymore in bond_3ad.c, since
all references to it are gone.

Signed-off-by: Jones Syue <jonessyue@xxxxxxxx>
---
v3:
  - replace macro with inline function in ad_port_selection_logic()
  - delete static variable null_mac_addr in bond_3ad.c
  - re-phrase patch description with more precise text
  - re-phrase patch description in imperative mood
v2: https://lore.kernel.org/netdev/SI2PR04MB5097AA23EE6799B3E56C0762DC552@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
  - add correct CC list by 'get_maintainer.pl -f .../bonding.rst'
v1: https://lore.kernel.org/netdev/SI2PR04MB50977DA9BB51D9C8FAF6928ADC562@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
---
 drivers/net/bonding/bond_3ad.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index f2942e8c6c91..c6807e473ab7 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -82,10 +82,6 @@ enum ad_link_speed_type {
 #define MAC_ADDRESS_EQUAL(A, B)	\
 	ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
 
-static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
-	0, 0, 0, 0, 0, 0
-};
-
 static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL;
 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 
@@ -1588,7 +1584,7 @@ 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 */
 		    )
 		   ) {
@@ -2036,9 +2032,7 @@ static void ad_enable_collecting(struct port *port)
  */
 static void ad_disable_distributing(struct port *port, bool *update_slave_arr)
 {
-	if (port->aggregator &&
-	    !MAC_ADDRESS_EQUAL(&port->aggregator->partner_system,
-			       &(null_mac_addr))) {
+	if (port->aggregator && __agg_has_partner(port->aggregator)) {
 		slave_dbg(port->slave->bond->dev, port->slave->dev,
 			  "Disabling distributing on port %d (LAG %d)\n",
 			  port->actor_port_number,
@@ -2078,9 +2072,7 @@ static void ad_enable_collecting_distributing(struct port *port,
 static void ad_disable_collecting_distributing(struct port *port,
 					       bool *update_slave_arr)
 {
-	if (port->aggregator &&
-	    !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
-			       &(null_mac_addr))) {
+	if (port->aggregator && __agg_has_partner(port->aggregator)) {
 		slave_dbg(port->slave->bond->dev, port->slave->dev,
 			  "Disabling port %d (LAG %d)\n",
 			  port->actor_port_number,
-- 
2.1.4