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Sat, 17 Oct 2020 21:36:34 +0000 From: Vladimir Oltean To: netdev@vger.kernel.org Cc: andrew@lunn.ch, f.fainelli@gmail.com, vivien.didelot@gmail.com, kuba@kernel.org, Christian Eggers , Kurt Kanzenbach Subject: [RFC PATCH 01/13] net: dsa: add plumbing for custom netdev statistics Date: Sun, 18 Oct 2020 00:35:59 +0300 Message-Id: <20201017213611.2557565-2-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201017213611.2557565-1-vladimir.oltean@nxp.com> References: <20201017213611.2557565-1-vladimir.oltean@nxp.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [188.26.174.215] X-ClientProxiedBy: VI1P195CA0091.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:59::44) To VI1PR04MB5696.eurprd04.prod.outlook.com (2603:10a6:803:e7::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (188.26.174.215) by VI1P195CA0091.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:59::44) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.20 via Frontend Transport; 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But reallocated packets are not standardized in struct pcpu_sw_netstats, struct net_device_stats or anywhere else, it seems, so we need to roll our own extra netdevice statistics and expose them to ethtool. Signed-off-by: Vladimir Oltean --- net/dsa/dsa_priv.h | 9 +++++++++ net/dsa/slave.c | 25 ++++++++++++++++++++++--- 2 files changed, 31 insertions(+), 3 deletions(-) diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index 12998bf04e55..d39db7500cdd 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -73,12 +73,21 @@ struct dsa_notifier_mtu_info { int mtu; }; +/* Driver statistics, other than those in struct rtnl_link_stats64. + * These are collected per-CPU and aggregated by ethtool. + */ +struct dsa_slave_stats { + __u64 tx_reallocs; + struct u64_stats_sync syncp; +} __aligned(1 * sizeof(u64)); + struct dsa_slave_priv { /* Copy of CPU port xmit for faster access in slave transmit hot path */ struct sk_buff * (*xmit)(struct sk_buff *skb, struct net_device *dev); struct pcpu_sw_netstats __percpu *stats64; + struct dsa_slave_stats __percpu *extra_stats; struct gro_cells gcells; diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 3bc5ca40c9fb..d4326940233c 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -668,9 +668,10 @@ static void dsa_slave_get_strings(struct net_device *dev, strncpy(data + len, "tx_bytes", len); strncpy(data + 2 * len, "rx_packets", len); strncpy(data + 3 * len, "rx_bytes", len); + strncpy(data + 4 * len, "tx_reallocs", len); if (ds->ops->get_strings) ds->ops->get_strings(ds, dp->index, stringset, - data + 4 * len); + data + 5 * len); } } @@ -682,11 +683,13 @@ static void dsa_slave_get_ethtool_stats(struct net_device *dev, struct dsa_slave_priv *p = netdev_priv(dev); struct dsa_switch *ds = dp->ds; struct pcpu_sw_netstats *s; + struct dsa_slave_stats *e; unsigned int start; int i; for_each_possible_cpu(i) { u64 tx_packets, tx_bytes, rx_packets, rx_bytes; + u64 tx_reallocs; s = per_cpu_ptr(p->stats64, i); do { @@ -696,13 +699,21 @@ static void dsa_slave_get_ethtool_stats(struct net_device *dev, rx_packets = s->rx_packets; rx_bytes = s->rx_bytes; } while (u64_stats_fetch_retry_irq(&s->syncp, start)); + + e = per_cpu_ptr(p->extra_stats, i); + do { + start = u64_stats_fetch_begin_irq(&e->syncp); + tx_reallocs = e->tx_reallocs; + } while (u64_stats_fetch_retry_irq(&e->syncp, start)); + data[0] += tx_packets; data[1] += tx_bytes; data[2] += rx_packets; data[3] += rx_bytes; + data[4] += tx_reallocs; } if (ds->ops->get_ethtool_stats) - ds->ops->get_ethtool_stats(ds, dp->index, data + 4); + ds->ops->get_ethtool_stats(ds, dp->index, data + 5); } static int dsa_slave_get_sset_count(struct net_device *dev, int sset) @@ -713,7 +724,7 @@ static int dsa_slave_get_sset_count(struct net_device *dev, int sset) if (sset == ETH_SS_STATS) { int count; - count = 4; + count = 5; if (ds->ops->get_sset_count) count += ds->ops->get_sset_count(ds, dp->index, sset); @@ -1806,6 +1817,12 @@ int dsa_slave_create(struct dsa_port *port) free_netdev(slave_dev); return -ENOMEM; } + p->extra_stats = netdev_alloc_pcpu_stats(struct dsa_slave_stats); + if (!p->extra_stats) { + free_percpu(p->stats64); + free_netdev(slave_dev); + return -ENOMEM; + } ret = gro_cells_init(&p->gcells, slave_dev); if (ret) @@ -1864,6 +1881,7 @@ int dsa_slave_create(struct dsa_port *port) out_gcells: gro_cells_destroy(&p->gcells); out_free: + free_percpu(p->extra_stats); free_percpu(p->stats64); free_netdev(slave_dev); port->slave = NULL; @@ -1886,6 +1904,7 @@ void dsa_slave_destroy(struct net_device *slave_dev) dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER); phylink_destroy(dp->pl); gro_cells_destroy(&p->gcells); + free_percpu(p->extra_stats); free_percpu(p->stats64); free_netdev(slave_dev); } -- 2.25.1