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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>
This commit is contained in:
Eric Dumazet 2019-11-07 16:27:14 -08:00 committed by David S. Miller
parent 0f030bdb16
commit de7d5084d8
2 changed files with 19 additions and 7 deletions
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24
drivers/net/loopback.c
View File

@ -99,13 +99,13 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
static void loopback_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes)
{
u64 bytes = 0;
u64 packets = 0;
int i;
*packets = 0;
*bytes = 0;
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
u64 tbytes, tpackets;
@ -114,12 +114,22 @@ static void loopback_get_stats64(struct net_device *dev,
lb_stats = per_cpu_ptr(dev->lstats, i);
do {
start = u64_stats_fetch_begin_irq(&lb_stats->syncp);
tbytes = lb_stats->bytes;
tpackets = lb_stats->packets;
tbytes = lb_stats->bytes;
} while (u64_stats_fetch_retry_irq(&lb_stats->syncp, start));
bytes += tbytes;
packets += tpackets;
*bytes += tbytes;
*packets += tpackets;
}
}
EXPORT_SYMBOL(dev_lstats_read);
static void loopback_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
u64 packets, bytes;
dev_lstats_read(dev, &packets, &bytes);
stats->rx_packets = packets;
stats->tx_packets = packets;
stats->rx_bytes = bytes;

2
include/linux/netdevice.h
View File

@ -2401,6 +2401,8 @@ struct pcpu_lstats {
struct u64_stats_sync syncp;
} __aligned(2 * sizeof(u64));
void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes);
#define __netdev_alloc_pcpu_stats(type, gfp) \
({ \
typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\