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Date: Mon, 12 Oct 2020 10:01:27 +0200 From: Heiner Kallweit <hkallweit1@...il.com> To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Bjørn Mork <bjorn@...k.no>, Oliver Neukum <oneukum@...e.com>, Igor Mitsyanko <imitsyanko@...ntenna.com>, Sergey Matyukevich <geomatsi@...il.com>, Kalle Valo <kvalo@...eaurora.org>, Roopa Prabhu <roopa@...dia.com>, Nikolay Aleksandrov <nikolay@...dia.com>, Andrew Lunn <andrew@...n.ch>, Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Johannes Berg <johannes@...solutions.net>, Pravin B Shelar <pshelar@....org>, Steffen Klassert <steffen.klassert@...unet.com>, Herbert Xu <herbert@...dor.apana.org.au> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, linux-rdma@...r.kernel.org, Linux USB Mailing List <linux-usb@...r.kernel.org>, linux-wireless <linux-wireless@...r.kernel.org>, bridge@...ts.linux-foundation.org Subject: [PATCH net-next v2 01/12] net: add function dev_fetch_sw_netstats for fetching pcpu_sw_netstats In several places the same code is used to populate rtnl_link_stats64 fields with data from pcpu_sw_netstats. Therefore factor out this code to a new function dev_fetch_sw_netstats(). v2: - constify argument netstats - don't ignore netstats being NULL or an ERRPTR - switch to EXPORT_SYMBOL_GPL Signed-off-by: Heiner Kallweit <hkallweit1@...il.com> --- include/linux/netdevice.h | 2 ++ net/core/dev.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index a0df43b13..fa1d8d624 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4495,6 +4495,8 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, struct rtnl_link_stats64 *storage); void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, const struct net_device_stats *netdev_stats); +void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, + const struct pcpu_sw_netstats __percpu *netstats); extern int netdev_max_backlog; extern int netdev_tstamp_prequeue; diff --git a/net/core/dev.c b/net/core/dev.c index a146bac84..26bc10dec 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10319,6 +10319,40 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, } EXPORT_SYMBOL(dev_get_stats); +/** + * dev_fetch_sw_netstats - get per-cpu network device statistics + * @s: place to store stats + * @netstats: per-cpu network stats to read from + * + * Read per-cpu network statistics and populate the related fields in @s. + */ +void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, + const struct pcpu_sw_netstats __percpu *netstats) +{ + int cpu; + + for_each_possible_cpu(cpu) { + const struct pcpu_sw_netstats *stats; + struct pcpu_sw_netstats tmp; + unsigned int start; + + stats = per_cpu_ptr(netstats, cpu); + do { + start = u64_stats_fetch_begin_irq(&stats->syncp); + tmp.rx_packets = stats->rx_packets; + tmp.rx_bytes = stats->rx_bytes; + tmp.tx_packets = stats->tx_packets; + tmp.tx_bytes = stats->tx_bytes; + } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); + + s->rx_packets += tmp.rx_packets; + s->rx_bytes += tmp.rx_bytes; + s->tx_packets += tmp.tx_packets; + s->tx_bytes += tmp.tx_bytes; + } +} +EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats); + struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) { struct netdev_queue *queue = dev_ingress_queue(dev); -- 2.28.0
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