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Message-Id: <20250613-netdevsim_stat-v2-1-98fa38836c48@debian.org>
Date: Fri, 13 Jun 2025 03:39:58 -0700
From: Breno Leitao <leitao@...ian.org>
To: Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, David Wei <dw@...idwei.uk>,
Shuah Khan <shuah@...nel.org>, Simon Horman <horms@...nel.org>, joe@...a.to
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, Breno Leitao <leitao@...ian.org>,
kernel-team@...a.com
Subject: [PATCH net-next v2 1/4] netdevsim: migrate to dstats stats
collection
Replace custom statistics tracking with the kernel's dstats infrastructure
to simplify code and improve consistency with other network drivers.
This change:
- Sets dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS for automatic
automatic allocation and deallocation.
- Removes manual stats fields and their update
- Replaces custom nsim_get_stats64() with dev_get_stats()
- Uses dev_dstats_tx_add() and dev_dstats_tx_dropped() helpers
- Eliminates the need for manual synchronization primitives
The dstats framework provides the same functionality with less code.
Suggested-by: Jakub Kicinski <kuba@...nel.org>
Reviewed-by: Joe Damato <joe@...a.to>
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
drivers/net/netdevsim/netdev.c | 33 ++++++---------------------------
drivers/net/netdevsim/netdevsim.h | 5 -----
2 files changed, 6 insertions(+), 32 deletions(-)
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index fa5fbd97ad69e..5010d8eefc854 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -93,19 +93,14 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
hrtimer_start(&rq->napi_timer, us_to_ktime(5), HRTIMER_MODE_REL);
rcu_read_unlock();
- u64_stats_update_begin(&ns->syncp);
- ns->tx_packets++;
- ns->tx_bytes += len;
- u64_stats_update_end(&ns->syncp);
+ dev_dstats_tx_add(dev, skb->len);
return NETDEV_TX_OK;
out_drop_free:
dev_kfree_skb(skb);
out_drop_cnt:
rcu_read_unlock();
- u64_stats_update_begin(&ns->syncp);
- ns->tx_dropped++;
- u64_stats_update_end(&ns->syncp);
+ dev_dstats_tx_dropped(dev);
return NETDEV_TX_OK;
}
@@ -126,20 +121,6 @@ static int nsim_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
-static void
-nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
-{
- struct netdevsim *ns = netdev_priv(dev);
- unsigned int start;
-
- do {
- start = u64_stats_fetch_begin(&ns->syncp);
- stats->tx_bytes = ns->tx_bytes;
- stats->tx_packets = ns->tx_packets;
- stats->tx_dropped = ns->tx_dropped;
- } while (u64_stats_fetch_retry(&ns->syncp, start));
-}
-
static int
nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
{
@@ -556,7 +537,6 @@ static const struct net_device_ops nsim_netdev_ops = {
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_change_mtu = nsim_change_mtu,
- .ndo_get_stats64 = nsim_get_stats64,
.ndo_set_vf_mac = nsim_set_vf_mac,
.ndo_set_vf_vlan = nsim_set_vf_vlan,
.ndo_set_vf_rate = nsim_set_vf_rate,
@@ -580,7 +560,6 @@ static const struct net_device_ops nsim_vf_netdev_ops = {
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_change_mtu = nsim_change_mtu,
- .ndo_get_stats64 = nsim_get_stats64,
.ndo_setup_tc = nsim_setup_tc,
.ndo_set_features = nsim_set_features,
};
@@ -594,7 +573,7 @@ static void nsim_get_queue_stats_rx(struct net_device *dev, int idx,
struct rtnl_link_stats64 rtstats = {};
if (!idx)
- nsim_get_stats64(dev, &rtstats);
+ dev_get_stats(dev, &rtstats);
stats->packets = rtstats.rx_packets - !!rtstats.rx_packets;
stats->bytes = rtstats.rx_bytes;
@@ -606,7 +585,7 @@ static void nsim_get_queue_stats_tx(struct net_device *dev, int idx,
struct rtnl_link_stats64 rtstats = {};
if (!idx)
- nsim_get_stats64(dev, &rtstats);
+ dev_get_stats(dev, &rtstats);
stats->packets = rtstats.tx_packets - !!rtstats.tx_packets;
stats->bytes = rtstats.tx_bytes;
@@ -618,7 +597,7 @@ static void nsim_get_base_stats(struct net_device *dev,
{
struct rtnl_link_stats64 rtstats = {};
- nsim_get_stats64(dev, &rtstats);
+ dev_get_stats(dev, &rtstats);
rx->packets = !!rtstats.rx_packets;
rx->bytes = 0;
@@ -890,6 +869,7 @@ static void nsim_setup(struct net_device *dev)
NETIF_F_HW_CSUM |
NETIF_F_LRO |
NETIF_F_TSO;
+ dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;
dev->max_mtu = ETH_MAX_MTU;
dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD;
}
@@ -1022,7 +1002,6 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
dev_net_set(dev, nsim_dev_net(nsim_dev));
ns = netdev_priv(dev);
ns->netdev = dev;
- u64_stats_init(&ns->syncp);
ns->nsim_dev = nsim_dev;
ns->nsim_dev_port = nsim_dev_port;
ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index d04401f0bdf79..343b8f19dbed6 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -108,11 +108,6 @@ struct netdevsim {
int rq_reset_mode;
- u64 tx_packets;
- u64 tx_bytes;
- u64 tx_dropped;
- struct u64_stats_sync syncp;
-
struct nsim_bus_dev *nsim_bus_dev;
struct bpf_prog *bpf_offloaded;
--
2.47.1
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