Messages in this thread Patch in this message | | | From | Yajun Deng <> | Subject | [PATCH] net/core: Export dev_core_stats_rx_dropped_inc sets | Date | Mon, 11 Sep 2023 16:20:16 +0800 |
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Although there is a kfree_skb_reason() helper function that can be used to find the reason for dropped packets, but most callers didn't increase one of rx_dropped, tx_dropped, rx_nohandler and rx_otherhost_dropped.
For the users, people are more concerned about why the dropped in ifconfig is increasing. So we can export dev_core_stats_rx_dropped_inc sets, which users would trace them know why rx_dropped is increasing.
Export dev_core_stats_{rx_dropped, tx_dropped, rx_nohandler, rx_otherhost_dropped}_inc for trace. Also, move dev_core_stats() and netdev_core_stats_alloc() in dev.c, because they are not called externally.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev> --- include/linux/netdevice.h | 32 +++++--------------------------- net/core/dev.c | 30 ++++++++++++++++++++++++++++-- 2 files changed, 33 insertions(+), 29 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0896aaa91dd7..879b01c85ba4 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3954,6 +3954,11 @@ int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb); bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb); +void dev_core_stats_rx_dropped_inc(struct net_device *dev); +void dev_core_stats_tx_dropped_inc(struct net_device *dev); +void dev_core_stats_rx_nohandler_inc(struct net_device *dev); +void dev_core_stats_rx_otherhost_dropped_inc(struct net_device *dev); + static __always_inline bool __is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb, const bool check_mtu) @@ -3980,33 +3985,6 @@ static __always_inline bool __is_skb_forwardable(const struct net_device *dev, return false; } -struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev); - -static inline struct net_device_core_stats __percpu *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 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 __percpu *p; \ - \ - p = dev_core_stats(dev); \ - if (p) \ - this_cpu_inc(p->FIELD); \ -} -DEV_CORE_STATS_INC(rx_dropped) -DEV_CORE_STATS_INC(tx_dropped) -DEV_CORE_STATS_INC(rx_nohandler) -DEV_CORE_STATS_INC(rx_otherhost_dropped) - static __always_inline int ____dev_forward_skb(struct net_device *dev, struct sk_buff *skb, const bool check_mtu) diff --git a/net/core/dev.c b/net/core/dev.c index ccff2b6ef958..32ba730405b4 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10475,7 +10475,7 @@ void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, } EXPORT_SYMBOL(netdev_stats_to_stats64); -struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev) +static struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev) { struct net_device_core_stats __percpu *p; @@ -10488,7 +10488,33 @@ struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device /* This READ_ONCE() pairs with the cmpxchg() above */ return READ_ONCE(dev->core_stats); } -EXPORT_SYMBOL(netdev_core_stats_alloc); + +static inline struct net_device_core_stats __percpu *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 p; + + return netdev_core_stats_alloc(dev); +} + +#define DEV_CORE_STATS_INC(FIELD) \ +void dev_core_stats_##FIELD##_inc(struct net_device *dev) \ +{ \ + struct net_device_core_stats __percpu *p; \ + \ + p = dev_core_stats(dev); \ + if (p) \ + this_cpu_inc(p->FIELD); \ +} \ +EXPORT_SYMBOL(dev_core_stats_##FIELD##_inc) + +DEV_CORE_STATS_INC(rx_dropped); +DEV_CORE_STATS_INC(tx_dropped); +DEV_CORE_STATS_INC(rx_nohandler); +DEV_CORE_STATS_INC(rx_otherhost_dropped); /** * dev_get_stats - get network device statistics -- 2.25.1
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