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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ppp@vger.kernel.org Subject: [PATCH net-next] ppp: convert to percpu netstats Date: Thu, 29 May 2025 17:21:08 +0800 Message-ID: <20250529092109.2303441-1-dqfext@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Convert to percpu netstats avoid lock contention when reading netstats. Signed-off-by: Qingfang Deng --- drivers/net/ppp/ppp_generic.c | 52 +++++++++++++---------------------- 1 file changed, 19 insertions(+), 33 deletions(-) diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index a27357bd674e..330c0cd89c15 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -107,18 +107,6 @@ struct ppp_file { #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) =20 -/* - * Data structure to hold primary network stats for which - * we want to use 64 bit storage. Other network stats - * are stored in dev->stats of the ppp strucute. - */ -struct ppp_link_stats { - u64 rx_packets; - u64 tx_packets; - u64 rx_bytes; - u64 tx_bytes; -}; - /* * Data structure describing one ppp unit. * A ppp unit corresponds to a ppp network interface device @@ -162,7 +150,6 @@ struct ppp { struct bpf_prog *active_filter; /* filter for pkts to reset idle */ #endif /* CONFIG_PPP_FILTER */ struct net *ppp_net; /* the net we belong to */ - struct ppp_link_stats stats64; /* 64 bit network stats */ }; =20 /* @@ -1539,23 +1526,12 @@ ppp_net_siocdevprivate(struct net_device *dev, stru= ct ifreq *ifr, static void ppp_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats64) { - struct ppp *ppp =3D netdev_priv(dev); - - ppp_recv_lock(ppp); - stats64->rx_packets =3D ppp->stats64.rx_packets; - stats64->rx_bytes =3D ppp->stats64.rx_bytes; - ppp_recv_unlock(ppp); - - ppp_xmit_lock(ppp); - stats64->tx_packets =3D ppp->stats64.tx_packets; - stats64->tx_bytes =3D ppp->stats64.tx_bytes; - ppp_xmit_unlock(ppp); - stats64->rx_errors =3D dev->stats.rx_errors; stats64->tx_errors =3D dev->stats.tx_errors; stats64->rx_dropped =3D dev->stats.rx_dropped; stats64->tx_dropped =3D dev->stats.tx_dropped; stats64->rx_length_errors =3D dev->stats.rx_length_errors; + dev_fetch_sw_netstats(stats64, dev->tstats); } =20 static int ppp_dev_init(struct net_device *dev) @@ -1650,6 +1626,7 @@ static void ppp_setup(struct net_device *dev) dev->type =3D ARPHRD_PPP; dev->flags =3D IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; dev->priv_destructor =3D ppp_dev_priv_destructor; + dev->pcpu_stat_type =3D NETDEV_PCPU_STAT_TSTATS; netif_keep_dst(dev); } =20 @@ -1796,8 +1773,7 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) #endif /* CONFIG_PPP_FILTER */ } =20 - ++ppp->stats64.tx_packets; - ppp->stats64.tx_bytes +=3D skb->len - PPP_PROTO_LEN; + dev_sw_netstats_tx_add(ppp->dev, 1, skb->len - PPP_PROTO_LEN); =20 switch (proto) { case PPP_IP: @@ -2474,8 +2450,7 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_bu= ff *skb) break; } =20 - ++ppp->stats64.rx_packets; - ppp->stats64.rx_bytes +=3D skb->len - 2; + dev_sw_netstats_rx_add(ppp->dev, skb->len - PPP_PROTO_LEN); =20 npi =3D proto_to_npindex(proto); if (npi < 0) { @@ -3303,14 +3278,25 @@ static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) { struct slcompress *vj =3D ppp->vj; + int cpu; =20 memset(st, 0, sizeof(*st)); - st->p.ppp_ipackets =3D ppp->stats64.rx_packets; + for_each_possible_cpu(cpu) { + struct pcpu_sw_netstats *p =3D per_cpu_ptr(ppp->dev->tstats, cpu); + u64 rx_packets, rx_bytes, tx_packets, tx_bytes; + + rx_packets =3D u64_stats_read(&p->rx_packets); + rx_bytes =3D u64_stats_read(&p->rx_bytes); + tx_packets =3D u64_stats_read(&p->tx_packets); + tx_bytes =3D u64_stats_read(&p->tx_bytes); + + st->p.ppp_ipackets +=3D rx_packets; + st->p.ppp_ibytes +=3D rx_bytes; + st->p.ppp_opackets +=3D tx_packets; + st->p.ppp_obytes +=3D tx_bytes; + } st->p.ppp_ierrors =3D ppp->dev->stats.rx_errors; - st->p.ppp_ibytes =3D ppp->stats64.rx_bytes; - st->p.ppp_opackets =3D ppp->stats64.tx_packets; st->p.ppp_oerrors =3D ppp->dev->stats.tx_errors; - st->p.ppp_obytes =3D ppp->stats64.tx_bytes; if (!vj) return; st->vj.vjs_packets =3D vj->sls_o_compressed + vj->sls_o_uncompressed; --=20 2.43.0