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static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)/* * Copyright (c) 2007-2014 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA *//** * struct dp_stats_percpu - per-cpu packet processing statistics for a given * datapath. * @n_hit: Number of received packets for which a matching flow was found in * the flow table. * @n_miss: Number of received packets that had no matching flow in the flow * table. The sum of @n_hit and @n_miss is the number of packets that have * been received by the datapath. * @n_lost: Number of received packets that had no matching flow in the flow * table that could not be sent to userspace (normally due to an overflow in * one of the datapath's queues). * @n_mask_hit: Number of masks looked up for flow match. * @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked * up per packet. */struct dp_stats_percpu { u64 n_hit; u64 n_missed; u64 n_lost; u64 n_mask_hit; struct u64_stats_sync syncp;};/** * struct datapath - datapath for flow-based packet switching * @rcu: RCU callback head for deferred destruction. * @list_node: Element in global 'dps' list. * @table: flow table. * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by * ovs_mutex and RCU. * @stats_percpu: Per-CPU datapath statistics. * @net: Reference to net namespace. * @max_headroom: the maximum headroom of all vports in this datapath; it will * be used by all the internal vports in this dp. * * Context: See the comment on locking at the top of datapath.c for additional * locking information. */struct datapath { struct rcu_head rcu; struct list_head list_node; /* Flow table. */ struct flow_table table; /* Switch ports. */ struct hlist_head *ports; /* Stats. */ struct dp_stats_percpu __percpu *stats_percpu; /* Network namespace ref. */ possible_net_t net;