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vlan: adopt u64_stats_t

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As explained in commit 316580b69d ("u64_stats: provide u64_stats_t type")
we should use u64_stats_t and related accessors to avoid load/store tearing.

Add READ_ONCE() when reading rx_errors & tx_dropped.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-06-08 08:46:32 -07:00 committed by Jakub Kicinski
parent d62607c3fe
commit 09cca53c16
5 changed files with 29 additions and 29 deletions
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18
drivers/net/macvlan.c
View file

@ -575,8 +575,8 @@ static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->tx_packets++;
pcpu_stats->tx_bytes += len;
u64_stats_inc(&pcpu_stats->tx_packets);
u64_stats_add(&pcpu_stats->tx_bytes, len);
u64_stats_update_end(&pcpu_stats->syncp);
} else {
this_cpu_inc(vlan->pcpu_stats->tx_dropped);
@ -949,11 +949,11 @@ static void macvlan_dev_get_stats64(struct net_device *dev,
p = per_cpu_ptr(vlan->pcpu_stats, i);
do {
start = u64_stats_fetch_begin_irq(&p->syncp);
rx_packets = p->rx_packets;
rx_bytes = p->rx_bytes;
rx_multicast = p->rx_multicast;
tx_packets = p->tx_packets;
tx_bytes = p->tx_bytes;
rx_packets = u64_stats_read(&p->rx_packets);
rx_bytes = u64_stats_read(&p->rx_bytes);
rx_multicast = u64_stats_read(&p->rx_multicast);
tx_packets = u64_stats_read(&p->tx_packets);
tx_bytes = u64_stats_read(&p->tx_bytes);
} while (u64_stats_fetch_retry_irq(&p->syncp, start));
stats->rx_packets += rx_packets;
@ -964,8 +964,8 @@ static void macvlan_dev_get_stats64(struct net_device *dev,
/* rx_errors & tx_dropped are u32, updated
* without syncp protection.
*/
rx_errors += p->rx_errors;
tx_dropped += p->tx_dropped;
rx_errors += READ_ONCE(p->rx_errors);
tx_dropped += READ_ONCE(p->tx_dropped);
}
stats->rx_errors = rx_errors;
stats->rx_dropped = rx_errors;

6
include/linux/if_macvlan.h
View file

@ -46,10 +46,10 @@ static inline void macvlan_count_rx(const struct macvlan_dev *vlan,
pcpu_stats = get_cpu_ptr(vlan->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->rx_packets++;
pcpu_stats->rx_bytes += len;
u64_stats_inc(&pcpu_stats->rx_packets);
u64_stats_add(&pcpu_stats->rx_bytes, len);
if (multicast)
pcpu_stats->rx_multicast++;
u64_stats_inc(&pcpu_stats->rx_multicast);
u64_stats_update_end(&pcpu_stats->syncp);
put_cpu_ptr(vlan->pcpu_stats);
} else {

10
include/linux/if_vlan.h
View file

@ -118,11 +118,11 @@ static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev)
* @tx_dropped: number of tx drops
*/
struct vlan_pcpu_stats {
u64 rx_packets;
u64 rx_bytes;
u64 rx_multicast;
u64 tx_packets;
u64 tx_bytes;
u64_stats_t rx_packets;
u64_stats_t rx_bytes;
u64_stats_t rx_multicast;
u64_stats_t tx_packets;
u64_stats_t tx_bytes;
struct u64_stats_sync syncp;
u32 rx_errors;
u32 tx_dropped;

6
net/8021q/vlan_core.c
View file

@ -63,10 +63,10 @@ bool vlan_do_receive(struct sk_buff **skbp)
rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
u64_stats_update_begin(&rx_stats->syncp);
rx_stats->rx_packets++;
rx_stats->rx_bytes += skb->len;
u64_stats_inc(&rx_stats->rx_packets);
u64_stats_add(&rx_stats->rx_bytes, skb->len);
if (skb->pkt_type == PACKET_MULTICAST)
rx_stats->rx_multicast++;
u64_stats_inc(&rx_stats->rx_multicast);
u64_stats_update_end(&rx_stats->syncp);
return true;

18
net/8021q/vlan_dev.c
View file

@ -128,8 +128,8 @@ static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
u64_stats_update_begin(&stats->syncp);
stats->tx_packets++;
stats->tx_bytes += len;
u64_stats_inc(&stats->tx_packets);
u64_stats_add(&stats->tx_bytes, len);
u64_stats_update_end(&stats->syncp);
} else {
this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
@ -713,11 +713,11 @@ static void vlan_dev_get_stats64(struct net_device *dev,
p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
do {
start = u64_stats_fetch_begin_irq(&p->syncp);
rxpackets = p->rx_packets;
rxbytes = p->rx_bytes;
rxmulticast = p->rx_multicast;
txpackets = p->tx_packets;
txbytes = p->tx_bytes;
rxpackets = u64_stats_read(&p->rx_packets);
rxbytes = u64_stats_read(&p->rx_bytes);
rxmulticast = u64_stats_read(&p->rx_multicast);
txpackets = u64_stats_read(&p->tx_packets);
txbytes = u64_stats_read(&p->tx_bytes);
} while (u64_stats_fetch_retry_irq(&p->syncp, start));
stats->rx_packets += rxpackets;
@ -726,8 +726,8 @@ static void vlan_dev_get_stats64(struct net_device *dev,
stats->tx_packets += txpackets;
stats->tx_bytes += txbytes;
/* rx_errors & tx_dropped are u32 */
rx_errors += p->rx_errors;
tx_dropped += p->tx_dropped;
rx_errors += READ_ONCE(p->rx_errors);
tx_dropped += READ_ONCE(p->tx_dropped);
}
stats->rx_errors = rx_errors;
stats->tx_dropped = tx_dropped;