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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/net/dummy.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* dummy.c: a dummy net driver
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 	The purpose of this driver is to provide a device to point a
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@@ -32,6 +33,7 @@
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 #include <linux/kernel.h>
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 #include <linux/netdevice.h>
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 #include <linux/etherdevice.h>
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+#include <linux/ethtool.h>
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 #include <linux/init.h>
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 #include <linux/moduleparam.h>
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 #include <linux/rtnetlink.h>
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@@ -40,7 +42,6 @@
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 #include <linux/u64_stats_sync.h>
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 #define DRV_NAME	"dummy"
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-#define DRV_VERSION	"1.0"
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 static int numdummies = 1;
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@@ -49,41 +50,15 @@
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 {
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 }
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-struct pcpu_dstats {
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-	u64			tx_packets;
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-	u64			tx_bytes;
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-	struct u64_stats_sync	syncp;
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-};
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-
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 static void dummy_get_stats64(struct net_device *dev,
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 			      struct rtnl_link_stats64 *stats)
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 {
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-	int i;
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-
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-	for_each_possible_cpu(i) {
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-		const struct pcpu_dstats *dstats;
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-		u64 tbytes, tpackets;
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-		unsigned int start;
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-
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-		dstats = per_cpu_ptr(dev->dstats, i);
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-		do {
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-			start = u64_stats_fetch_begin_irq(&dstats->syncp);
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-			tbytes = dstats->tx_bytes;
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-			tpackets = dstats->tx_packets;
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-		} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
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-		stats->tx_bytes += tbytes;
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-		stats->tx_packets += tpackets;
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-	}
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+	dev_lstats_read(dev, &stats->tx_packets, &stats->tx_bytes);
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 }
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 static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
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 {
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-	struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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-
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-	u64_stats_update_begin(&dstats->syncp);
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-	dstats->tx_packets++;
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-	dstats->tx_bytes += skb->len;
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-	u64_stats_update_end(&dstats->syncp);
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+	dev_lstats_add(dev, skb->len);
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 	skb_tx_timestamp(skb);
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 	dev_kfree_skb(skb);
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@@ -92,8 +67,8 @@
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 static int dummy_dev_init(struct net_device *dev)
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 {
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-	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
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-	if (!dev->dstats)
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+	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
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+	if (!dev->lstats)
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 		return -ENOMEM;
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 	return 0;
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@@ -101,7 +76,7 @@
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 static void dummy_dev_uninit(struct net_device *dev)
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 {
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-	free_percpu(dev->dstats);
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+	free_percpu(dev->lstats);
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 }
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 static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
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@@ -128,24 +103,11 @@
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 			      struct ethtool_drvinfo *info)
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 {
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 	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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-	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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 }
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-
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-static int dummy_get_ts_info(struct net_device *dev,
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-			      struct ethtool_ts_info *ts_info)
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-{
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-	ts_info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
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-				   SOF_TIMESTAMPING_RX_SOFTWARE |
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-				   SOF_TIMESTAMPING_SOFTWARE;
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-
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-	ts_info->phc_index = -1;
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-
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-	return 0;
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-};
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 static const struct ethtool_ops dummy_ethtool_ops = {
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 	.get_drvinfo            = dummy_get_drvinfo,
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-	.get_ts_info		= dummy_get_ts_info,
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+	.get_ts_info		= ethtool_op_get_ts_info,
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 };
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 static void dummy_setup(struct net_device *dev)
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@@ -248,4 +210,3 @@
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 module_exit(dummy_cleanup_module);
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 MODULE_LICENSE("GPL");
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 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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-MODULE_VERSION(DRV_VERSION);