net: add per-cpu storage and net->core_stats

Before adding yet another possibly contended atomic_long_t,
it is time to add per-cpu storage for existing ones:
 dev->tx_dropped, dev->rx_dropped, and dev->rx_nohandler

Because many devices do not have to increment such counters,
allocate the per-cpu storage on demand, so that dev_get_stats()
does not have to spend considerable time folding zero counters.

Note that some drivers have abused these counters which
were supposed to be only used by core networking stack.

v4: should use per_cpu_ptr() in dev_get_stats() (Jakub)
v3: added a READ_ONCE() in netdev_core_stats_alloc() (Paolo)
v2: add a missing include (reported by kernel test robot <lkp@intel.com>)
    Change in netdev_core_stats_alloc() (Jakub)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: jeffreyji <jeffreyji@google.com>
Reviewed-by: Brian Vazquez <brianvv@google.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20220311051420.2608812-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 55e0ba2..15eddca 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -5120,7 +5120,7 @@ static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
        if (xmit_suc)
                return NETDEV_TX_OK;
 
-       atomic_long_inc(&bond_dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(bond_dev);
        return NET_XMIT_DROP;
 }
 

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 2de0295..92a1a43 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -370,7 +370,7 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
        i = skb_get_queue_mapping(skb);
        if (unlikely(i >= bp->tx_nr_rings)) {
                dev_kfree_skb_any(skb);
-               atomic_long_inc(&dev->tx_dropped);
+               dev_core_stats_tx_dropped_inc(dev);
                return NETDEV_TX_OK;
        }
 
@@ -646,7 +646,7 @@ tx_kick_pending:
        if (txr->kick_pending)
                bnxt_txr_db_kick(bp, txr, txr->tx_prod);
        txr->tx_buf_ring[txr->tx_prod].skb = NULL;
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        return NETDEV_TX_OK;
 }
 

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index d7a27c2..54faf0f 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -887,8 +887,8 @@ static void hns_get_ethtool_stats(struct net_device *netdev,
        p[21] = net_stats->rx_compressed;
        p[22] = net_stats->tx_compressed;
 
-       p[23] = netdev->rx_dropped.counter;
-       p[24] = netdev->tx_dropped.counter;
+       p[23] = 0; /* was netdev->rx_dropped.counter */
+       p[24] = 0; /* was netdev->tx_dropped.counter */
 
        p[25] = priv->tx_timeout_count;
 

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index bfbd784..a313242 100644 (file)
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -207,7 +207,7 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
        dev = skb->dev;
        port = rmnet_get_port_rcu(dev);
        if (unlikely(!port)) {
-               atomic_long_inc(&skb->dev->rx_nohandler);
+               dev_core_stats_rx_nohandler_inc(skb->dev);
                kfree_skb(skb);
                goto done;
        }

diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
index c613900..6ffb274 100644 (file)
--- a/drivers/net/ipvlan/ipvlan_core.c
+++ b/drivers/net/ipvlan/ipvlan_core.c
@@ -555,7 +555,7 @@ static void ipvlan_multicast_enqueue(struct ipvl_port *port,
                schedule_work(&port->wq);
        } else {
                spin_unlock(&port->backlog.lock);
-               atomic_long_inc(&skb->dev->rx_dropped);
+               dev_core_stats_rx_dropped_inc(skb->dev);
                kfree_skb(skb);
        }
 }

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 33753a2..4b77819 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -371,7 +371,7 @@ static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 free_nskb:
        kfree_skb(nskb);
 err:
-       atomic_long_inc(&skb->dev->rx_dropped);
+       dev_core_stats_rx_dropped_inc(skb->dev);
 }
 
 static void macvlan_flush_sources(struct macvlan_port *port,

diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
index 86ec5aa..21a0435 100644 (file)
--- a/drivers/net/net_failover.c
+++ b/drivers/net/net_failover.c
@@ -89,7 +89,7 @@ static int net_failover_close(struct net_device *dev)
 static netdev_tx_t net_failover_drop_xmit(struct sk_buff *skb,
                                          struct net_device *dev)
 {
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        dev_kfree_skb_any(skb);
        return NETDEV_TX_OK;
 }

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2b9a226..276a0e4 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1135,7 +1135,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
        return NETDEV_TX_OK;
 
 drop:
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        skb_tx_error(skb);
        kfree_skb_reason(skb, drop_reason);
        rcu_read_unlock();
@@ -1291,7 +1291,7 @@ resample:
                void *frame = tun_xdp_to_ptr(xdp);
 
                if (__ptr_ring_produce(&tfile->tx_ring, frame)) {
-                       atomic_long_inc(&dev->tx_dropped);
+                       dev_core_stats_tx_dropped_inc(dev);
                        break;
                }
                nxmit++;
@@ -1626,7 +1626,7 @@ static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog,
                trace_xdp_exception(tun->dev, xdp_prog, act);
                fallthrough;
        case XDP_DROP:
-               atomic_long_inc(&tun->dev->rx_dropped);
+               dev_core_stats_rx_dropped_inc(tun->dev);
                break;
        }
 
@@ -1797,7 +1797,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
                 */
                skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp);
                if (IS_ERR(skb)) {
-                       atomic_long_inc(&tun->dev->rx_dropped);
+                       dev_core_stats_rx_dropped_inc(tun->dev);
                        return PTR_ERR(skb);
                }
                if (!skb)
@@ -1826,7 +1826,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 
                if (IS_ERR(skb)) {
                        if (PTR_ERR(skb) != -EAGAIN)
-                               atomic_long_inc(&tun->dev->rx_dropped);
+                               dev_core_stats_rx_dropped_inc(tun->dev);
                        if (frags)
                                mutex_unlock(&tfile->napi_mutex);
                        return PTR_ERR(skb);
@@ -1841,7 +1841,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
                        err = -EFAULT;
                        drop_reason = SKB_DROP_REASON_SKB_UCOPY_FAULT;
 drop:
-                       atomic_long_inc(&tun->dev->rx_dropped);
+                       dev_core_stats_rx_dropped_inc(tun->dev);
                        kfree_skb_reason(skb, drop_reason);
                        if (frags) {
                                tfile->napi.skb = NULL;
@@ -1876,7 +1876,7 @@ drop:
                                pi.proto = htons(ETH_P_IPV6);
                                break;
                        default:
-                               atomic_long_inc(&tun->dev->rx_dropped);
+                               dev_core_stats_rx_dropped_inc(tun->dev);
                                kfree_skb(skb);
                                return -EINVAL;
                        }
@@ -1956,7 +1956,7 @@ drop:
                                          skb_headlen(skb));
 
                if (unlikely(headlen > skb_headlen(skb))) {
-                       atomic_long_inc(&tun->dev->rx_dropped);
+                       dev_core_stats_rx_dropped_inc(tun->dev);
                        napi_free_frags(&tfile->napi);
                        rcu_read_unlock();
                        mutex_unlock(&tfile->napi_mutex);

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 3872f76..de97ff9 100644 (file)
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1760,7 +1760,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
 
        if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
                rcu_read_unlock();
-               atomic_long_inc(&vxlan->dev->rx_dropped);
+               dev_core_stats_rx_dropped_inc(vxlan->dev);
                vxlan_vnifilter_count(vxlan, vni, vninode,
                                      VXLAN_VNI_STATS_RX_DROPS, 0);
                goto drop;

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index acd3cf6..0d99471 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -28,6 +28,7 @@
 #include <linux/prefetch.h>
 #include <asm/cache.h>
 #include <asm/byteorder.h>
+#include <asm/local.h>
 
 #include <linux/percpu.h>
 #include <linux/rculist.h>
@@ -194,6 +195,14 @@ struct net_device_stats {
        unsigned long   tx_compressed;
 };
 
+/* per-cpu stats, allocated on demand.
+ * Try to fit them in a single cache line, for dev_get_stats() sake.
+ */
+struct net_device_core_stats {
+       local_t         rx_dropped;
+       local_t         tx_dropped;
+       local_t         rx_nohandler;
+} __aligned(4 * sizeof(local_t));
 
 #include <linux/cache.h>
 #include <linux/skbuff.h>
@@ -1735,12 +1744,8 @@ enum netdev_ml_priv_type {
  *     @stats:         Statistics struct, which was left as a legacy, use
  *                     rtnl_link_stats64 instead
  *
- *     @rx_dropped:    Dropped packets by core network,
- *                     do not use this in drivers
- *     @tx_dropped:    Dropped packets by core network,
+ *     @core_stats:    core networking counters,
  *                     do not use this in drivers
- *     @rx_nohandler:  nohandler dropped packets by core network on
- *                     inactive devices, do not use this in drivers
  *     @carrier_up_count:      Number of times the carrier has been up
  *     @carrier_down_count:    Number of times the carrier has been down
  *
@@ -2023,9 +2028,7 @@ struct net_device {
 
        struct net_device_stats stats; /* not used by modern drivers */
 
-       atomic_long_t           rx_dropped;
-       atomic_long_t           tx_dropped;
-       atomic_long_t           rx_nohandler;
+       struct net_device_core_stats __percpu *core_stats;
 
        /* Stats to monitor link on/off, flapping */
        atomic_t                carrier_up_count;
@@ -3839,13 +3842,38 @@ static __always_inline bool __is_skb_forwardable(const struct net_device *dev,
        return false;
 }
 
+struct net_device_core_stats *netdev_core_stats_alloc(struct net_device *dev);
+
+static inline struct net_device_core_stats *dev_core_stats(struct net_device *dev)
+{
+       /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
+       struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats);
+
+       if (likely(p))
+               return this_cpu_ptr(p);
+
+       return netdev_core_stats_alloc(dev);
+}
+
+#define DEV_CORE_STATS_INC(FIELD)                                              \
+static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev)                \
+{                                                                              \
+       struct net_device_core_stats *p = dev_core_stats(dev);                  \
+                                                                               \
+       if (p)                                                                  \
+               local_inc(&p->FIELD);                                           \
+}
+DEV_CORE_STATS_INC(rx_dropped)
+DEV_CORE_STATS_INC(tx_dropped)
+DEV_CORE_STATS_INC(rx_nohandler)
+
 static __always_inline int ____dev_forward_skb(struct net_device *dev,
                                               struct sk_buff *skb,
                                               const bool check_mtu)
 {
        if (skb_orphan_frags(skb, GFP_ATOMIC) ||
            unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) {
-               atomic_long_inc(&dev->rx_dropped);
+               dev_core_stats_rx_dropped_inc(dev);
                kfree_skb(skb);
                return NET_RX_DROP;
        }

diff --git a/include/net/bonding.h b/include/net/bonding.h
index d0dfe72..b14f4c0 100644 (file)
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -770,7 +770,7 @@ extern const struct sysfs_ops slave_sysfs_ops;
 
 static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 {
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        dev_kfree_skb_any(skb);
        return NET_XMIT_DROP;
 }

diff --git a/net/core/dev.c b/net/core/dev.c
index 7ed27c1..8d25ec5 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3633,7 +3633,7 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device
 out_kfree_skb:
        kfree_skb(skb);
 out_null:
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        return NULL;
 }
 
@@ -4184,7 +4184,7 @@ recursion_alert:
        rc = -ENETDOWN;
        rcu_read_unlock_bh();
 
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        kfree_skb_list(skb);
        return rc;
 out:
@@ -4236,7 +4236,7 @@ int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
        local_bh_enable();
        return ret;
 drop:
-       atomic_long_inc(&dev->tx_dropped);
+       dev_core_stats_tx_dropped_inc(dev);
        kfree_skb_list(skb);
        return NET_XMIT_DROP;
 }
@@ -4602,7 +4602,7 @@ drop:
        sd->dropped++;
        rps_unlock_irq_restore(sd, &flags);
 
-       atomic_long_inc(&skb->dev->rx_dropped);
+       dev_core_stats_rx_dropped_inc(skb->dev);
        kfree_skb_reason(skb, reason);
        return NET_RX_DROP;
 }
@@ -5357,10 +5357,10 @@ check_vlan_id:
        } else {
 drop:
                if (!deliver_exact) {
-                       atomic_long_inc(&skb->dev->rx_dropped);
+                       dev_core_stats_rx_dropped_inc(skb->dev);
                        kfree_skb_reason(skb, SKB_DROP_REASON_PTYPE_ABSENT);
                } else {
-                       atomic_long_inc(&skb->dev->rx_nohandler);
+                       dev_core_stats_rx_nohandler_inc(skb->dev);
                        kfree_skb(skb);
                }
                /* Jamal, now you will not able to escape explaining
@@ -10280,6 +10280,25 @@ void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
 }
 EXPORT_SYMBOL(netdev_stats_to_stats64);
 
+struct net_device_core_stats *netdev_core_stats_alloc(struct net_device *dev)
+{
+       struct net_device_core_stats __percpu *p;
+
+       p = alloc_percpu_gfp(struct net_device_core_stats,
+                            GFP_ATOMIC | __GFP_NOWARN);
+
+       if (p && cmpxchg(&dev->core_stats, NULL, p))
+               free_percpu(p);
+
+       /* This READ_ONCE() pairs with the cmpxchg() above */
+       p = READ_ONCE(dev->core_stats);
+       if (!p)
+               return NULL;
+
+       return this_cpu_ptr(p);
+}
+EXPORT_SYMBOL(netdev_core_stats_alloc);
+
 /**
  *     dev_get_stats   - get network device statistics
  *     @dev: device to get statistics from
@@ -10294,6 +10313,7 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
                                        struct rtnl_link_stats64 *storage)
 {
        const struct net_device_ops *ops = dev->netdev_ops;
+       const struct net_device_core_stats __percpu *p;
 
        if (ops->ndo_get_stats64) {
                memset(storage, 0, sizeof(*storage));
@@ -10303,9 +10323,20 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
        } else {
                netdev_stats_to_stats64(storage, &dev->stats);
        }
-       storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped);
-       storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped);
-       storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler);
+
+       /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
+       p = READ_ONCE(dev->core_stats);
+       if (p) {
+               const struct net_device_core_stats *core_stats;
+               int i;
+
+               for_each_possible_cpu(i) {
+                       core_stats = per_cpu_ptr(p, i);
+                       storage->rx_dropped += local_read(&core_stats->rx_dropped);
+                       storage->tx_dropped += local_read(&core_stats->tx_dropped);
+                       storage->rx_nohandler += local_read(&core_stats->rx_nohandler);
+               }
+       }
        return storage;
 }
 EXPORT_SYMBOL(dev_get_stats);
@@ -10567,6 +10598,8 @@ void free_netdev(struct net_device *dev)
        free_percpu(dev->pcpu_refcnt);
        dev->pcpu_refcnt = NULL;
 #endif
+       free_percpu(dev->core_stats);
+       dev->core_stats = NULL;
        free_percpu(dev->xdp_bulkq);
        dev->xdp_bulkq = NULL;
 

diff --git a/net/core/gro_cells.c b/net/core/gro_cells.c
index 8462f92..541c7a7 100644 (file)
--- a/net/core/gro_cells.c
+++ b/net/core/gro_cells.c
@@ -28,7 +28,7 @@ int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
 
        if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
 drop:
-               atomic_long_inc(&dev->rx_dropped);
+               dev_core_stats_rx_dropped_inc(dev);
                kfree_skb(skb);
                res = NET_RX_DROP;
                goto unlock;

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index 7f25021..6ffef47 100644 (file)
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -221,7 +221,7 @@ static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
                skb_reset_mac_len(skb);
                hsr_forward_skb(skb, master);
        } else {
-               atomic_long_inc(&dev->tx_dropped);
+               dev_core_stats_tx_dropped_inc(dev);
                dev_kfree_skb_any(skb);
        }
        return NETDEV_TX_OK;

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 39bce5d..3e3448a 100644 (file)
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -143,7 +143,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
                segs = skb_gso_segment(skb, esp_features);
                if (IS_ERR(segs)) {
                        kfree_skb(skb);
-                       atomic_long_inc(&dev->tx_dropped);
+                       dev_core_stats_tx_dropped_inc(dev);
                        return NULL;
                } else {
                        consume_skb(skb);