[PATCH net-next 12/15] net: enetc: use MADDR_TYPE for MAC filter array size

[Wei Fang]

The mac_filter array in struct enetc_pf is sized as
ENETC_MAX_NUM_MAC_FLT, defined as (ENETC_MAX_NUM_VFS + 1) * MADDR_TYPE.
This resulted in an array of 6 elements (for 2 VFs), but only the first
2 entries are actually used.

The PF driver maintains MAC filters for unicast (UC) and multicast (MC)
addresses, indexed by the enum enetc_mac_addr_type (UC=0, MC=1). The
code only iterates over MADDR_TYPE (2) entries and directly accesses
mac_filter[UC] and mac_filter[MC]. The extra space allocated for
(ENETC_MAX_NUM_VFS * MADDR_TYPE) entries is never used because VF MAC
filtering is not implemented yet.

Remove the ENETC_MAX_NUM_MAC_FLT macro and size the array as
MADDR_TYPE, reducing the allocation from 6 to 2 entries. This saves 48
bytes per PF and better reflects the actual usage.

This change has no functional impact. Future VF MAC filtering support
will move mac_filter into struct enetc_si, allowing each SI (PF or VF)
to maintain its own independent filter table.

Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
---
 drivers/net/ethernet/freescale/enetc/enetc_pf.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.h b/drivers/net/ethernet/freescale/enetc/enetc_pf.h
index 731d56bad5fc..9fcf1c58d59b 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.h
@@ -5,8 +5,6 @@
 #include <linux/phylink.h>
 
 #define ENETC_PF_NUM_RINGS	8
-#define ENETC_MAX_NUM_MAC_FLT	((ENETC_MAX_NUM_VFS + 1) * MADDR_TYPE)
-
 #define ENETC_VLAN_HT_SIZE	64
 
 enum enetc_vf_flags {
@@ -42,7 +40,7 @@ struct enetc_pf {
 	int total_vfs; /* max number of VFs, set for PF at probe */
 	struct enetc_vf_state *vf_state;
 
-	struct enetc_mac_filter mac_filter[ENETC_MAX_NUM_MAC_FLT];
+	struct enetc_mac_filter mac_filter[MADDR_TYPE];
 
 	struct enetc_msg_swbd rxmsg[ENETC_MAX_NUM_VFS];
 	struct work_struct msg_task;
-- 
2.34.1