mirror of https://gitee.com/openkylin/linux.git
net: provide dev_lstats_read() helper
Many network drivers use hand-coded implementation of the same thing, let's factorize things so that u64_stats_t adoption is done once. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -99,13 +99,13 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
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return NETDEV_TX_OK;
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}
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static void loopback_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes)
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{
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u64 bytes = 0;
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u64 packets = 0;
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int i;
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*packets = 0;
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*bytes = 0;
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for_each_possible_cpu(i) {
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const struct pcpu_lstats *lb_stats;
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u64 tbytes, tpackets;
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@ -114,12 +114,22 @@ static void loopback_get_stats64(struct net_device *dev,
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lb_stats = per_cpu_ptr(dev->lstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&lb_stats->syncp);
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tbytes = lb_stats->bytes;
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tpackets = lb_stats->packets;
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tbytes = lb_stats->bytes;
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} while (u64_stats_fetch_retry_irq(&lb_stats->syncp, start));
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bytes += tbytes;
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packets += tpackets;
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*bytes += tbytes;
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*packets += tpackets;
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}
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}
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EXPORT_SYMBOL(dev_lstats_read);
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static void loopback_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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u64 packets, bytes;
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dev_lstats_read(dev, &packets, &bytes);
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stats->rx_packets = packets;
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stats->tx_packets = packets;
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stats->rx_bytes = bytes;
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@ -2401,6 +2401,8 @@ struct pcpu_lstats {
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struct u64_stats_sync syncp;
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} __aligned(2 * sizeof(u64));
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void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes);
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#define __netdev_alloc_pcpu_stats(type, gfp) \
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({ \
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typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
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