ibmvnic: Fix hardcoded NUM_RX_STATS/NUM_TX_STATS with dynamic sizeof

JIRA: https://issues.redhat.com/browse/RHEL-104119

commit 01b8114
Author: Mingming Cao <mmc@linux.ibm.com>
Date:   Wed Jul 9 08:33:32 2025 -0700

    ibmvnic: Fix hardcoded NUM_RX_STATS/NUM_TX_STATS with dynamic sizeof

    The previous hardcoded definitions of NUM_RX_STATS and
    NUM_TX_STATS were not updated when new fields were added
    to the ibmvnic_{rx,tx}_queue_stats structures. Specifically,
    commit 2ee73c5 ("ibmvnic: Add stat for tx direct vs tx
    batched") added a fourth TX stat, but NUM_TX_STATS remained 3,
    leading to a mismatch.

    This patch replaces the static defines with dynamic sizeof-based
    calculations to ensure the stat arrays are correctly sized.
    This fixes incorrect indexing and prevents incomplete stat
    reporting in tools like ethtool.

    Fixes: 2ee73c5 ("ibmvnic: Add stat for tx direct vs tx batched")
    Signed-off-by: Mingming Cao <mmc@linux.ibm.com>
    Reviewed-by: Dave Marquardt <davemarq@linux.ibm.com>
    Reviewed-by: Haren Myneni <haren@linux.ibm.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Link: https://patch.msgid.link/20250709153332.73892-1-mmc@linux.ibm.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>

Author: Mamatha Inamdar

drivers/net/ethernet/ibm/ibmvnic.h

@@ -175,21 +175,25 @@ struct ibmvnic_statistics {
 	u8 reserved[72];
 } __packed __aligned(8);
 
-#define NUM_TX_STATS 3
 struct ibmvnic_tx_queue_stats {
 	u64 batched_packets;
 	u64 direct_packets;
 	u64 bytes;
 	u64 dropped_packets;
 };
 
-#define NUM_RX_STATS 3
+#define NUM_TX_STATS \
+	(sizeof(struct ibmvnic_tx_queue_stats) / sizeof(u64))
+
 struct ibmvnic_rx_queue_stats {
 	u64 packets;
 	u64 bytes;
 	u64 interrupts;
 };
 
+#define NUM_RX_STATS \
+	(sizeof(struct ibmvnic_rx_queue_stats) / sizeof(u64))
+
 struct ibmvnic_acl_buffer {
 	__be32 len;
 	__be32 version;