From: Rakesh Sankaranarayanan <redacted>
Date: Fri, 17 Feb 2023 16:32:09 +0530

    Add support for ethtool standard device statistics grouping.
    Support ethernet mac statistics grouping using eth-mac groups
    parameter in ethtool command.

Signed-off-by: Rakesh Sankaranarayanan <redacted>

[...]

+void ksz8_get_eth_mac_stats(struct ksz_device *dev, int port,
+			    struct ethtool_eth_mac_stats *mac_stats)
+{
+	struct ksz_port_mib *mib;
+	u64 *ctr;
+
+	mib = &dev->ports[port].mib;
+
+	mutex_lock(&mib->cnt_mutex);
+	ctr = mib->counters;
+
+	while (mib->cnt_ptr < dev->info->mib_cnt) {
+		dev->dev_ops->r_mib_pkt(dev, port, mib->cnt_ptr,
+			       NULL, &mib->counters[mib->cnt_ptr]);

(for example here)

+		++mib->cnt_ptr;

Reason for the pre-increment? :)

+	}
+
+	mac_stats->FramesTransmittedOK = ctr[KSZ8_TX_MCAST] +
+					 ctr[KSZ8_TX_BCAST] +
+					 ctr[KSZ8_TX_UCAST] +
+					 ctr[KSZ8_TX_PAUSE] -
+					 ctr[KSZ8_TX_DISCARDS];

[...]

Thanks,
Olek