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openvswitch: change the data type of error status to atomic_long_t
Change the date type of error status from u64 to atomic_long_t, and use atomic operation, then remove the lock which is used to protect the error status. The operation of atomic maybe faster than spin lock. Cc: Pravin Shelar <pshelar@nicira.com> Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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5aaa62d608
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2 changed files with 12 additions and 23 deletions
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@ -148,8 +148,6 @@ struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
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return ERR_PTR(-ENOMEM);
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return ERR_PTR(-ENOMEM);
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}
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}
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spin_lock_init(&vport->stats_lock);
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return vport;
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return vport;
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}
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}
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@ -268,14 +266,10 @@ void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
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* netdev-stats can be directly read over netlink-ioctl.
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* netdev-stats can be directly read over netlink-ioctl.
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*/
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*/
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spin_lock_bh(&vport->stats_lock);
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stats->rx_errors = atomic_long_read(&vport->err_stats.rx_errors);
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stats->tx_errors = atomic_long_read(&vport->err_stats.tx_errors);
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stats->rx_errors = vport->err_stats.rx_errors;
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stats->tx_dropped = atomic_long_read(&vport->err_stats.tx_dropped);
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stats->tx_errors = vport->err_stats.tx_errors;
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stats->rx_dropped = atomic_long_read(&vport->err_stats.rx_dropped);
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stats->tx_dropped = vport->err_stats.tx_dropped;
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stats->rx_dropped = vport->err_stats.rx_dropped;
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spin_unlock_bh(&vport->stats_lock);
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for_each_possible_cpu(i) {
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for_each_possible_cpu(i) {
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const struct pcpu_sw_netstats *percpu_stats;
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const struct pcpu_sw_netstats *percpu_stats;
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@ -495,27 +489,24 @@ int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
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static void ovs_vport_record_error(struct vport *vport,
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static void ovs_vport_record_error(struct vport *vport,
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enum vport_err_type err_type)
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enum vport_err_type err_type)
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{
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{
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spin_lock(&vport->stats_lock);
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switch (err_type) {
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switch (err_type) {
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case VPORT_E_RX_DROPPED:
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case VPORT_E_RX_DROPPED:
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vport->err_stats.rx_dropped++;
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atomic_long_inc(&vport->err_stats.rx_dropped);
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break;
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break;
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case VPORT_E_RX_ERROR:
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case VPORT_E_RX_ERROR:
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vport->err_stats.rx_errors++;
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atomic_long_inc(&vport->err_stats.rx_errors);
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break;
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break;
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case VPORT_E_TX_DROPPED:
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case VPORT_E_TX_DROPPED:
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vport->err_stats.tx_dropped++;
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atomic_long_inc(&vport->err_stats.tx_dropped);
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break;
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break;
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case VPORT_E_TX_ERROR:
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case VPORT_E_TX_ERROR:
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vport->err_stats.tx_errors++;
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atomic_long_inc(&vport->err_stats.tx_errors);
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break;
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break;
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}
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}
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spin_unlock(&vport->stats_lock);
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}
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}
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static void free_vport_rcu(struct rcu_head *rcu)
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static void free_vport_rcu(struct rcu_head *rcu)
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@ -62,10 +62,10 @@ int ovs_vport_send(struct vport *, struct sk_buff *);
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/* The following definitions are for implementers of vport devices: */
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/* The following definitions are for implementers of vport devices: */
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struct vport_err_stats {
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struct vport_err_stats {
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u64 rx_dropped;
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atomic_long_t rx_dropped;
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u64 rx_errors;
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atomic_long_t rx_errors;
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u64 tx_dropped;
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atomic_long_t tx_dropped;
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u64 tx_errors;
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atomic_long_t tx_errors;
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};
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};
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/**
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/**
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* struct vport_portids - array of netlink portids of a vport.
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* struct vport_portids - array of netlink portids of a vport.
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@ -93,7 +93,6 @@ struct vport_portids {
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* @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
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* @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
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* @ops: Class structure.
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* @ops: Class structure.
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* @percpu_stats: Points to per-CPU statistics used and maintained by vport
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* @percpu_stats: Points to per-CPU statistics used and maintained by vport
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* @stats_lock: Protects @err_stats;
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* @err_stats: Points to error statistics used and maintained by vport
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* @err_stats: Points to error statistics used and maintained by vport
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*/
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*/
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struct vport {
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struct vport {
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@ -108,7 +107,6 @@ struct vport {
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struct pcpu_sw_netstats __percpu *percpu_stats;
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struct pcpu_sw_netstats __percpu *percpu_stats;
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spinlock_t stats_lock;
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struct vport_err_stats err_stats;
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struct vport_err_stats err_stats;
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};
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};
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