X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=datapath%2Fdatapath.h;h=2b9334835d063639b970191ca446d2f4c127391c;hb=5ca1ba484bd9ade5116a49cf241cb98219d7d696;hp=d28250a128006f259272285ffa0ebd7bf3f71104;hpb=576e26d7b47f4e53116ef0b5f035d260f426d37b;p=sliver-openvswitch.git diff --git a/datapath/datapath.h b/datapath/datapath.h index d28250a12..2b9334835 100644 --- a/datapath/datapath.h +++ b/datapath/datapath.h @@ -1,13 +1,21 @@ /* - * Copyright (c) 2009 Nicira Networks. - * Distributed under the terms of the GNU GPL version 2. + * Copyright (c) 2007-2012 Nicira, Inc. * - * Significant portions of this file may be copied from parts of the Linux - * kernel, by Linus Torvalds and others. + * 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 */ -/* Interface exported by openvswitch_mod. */ - #ifndef DATAPATH_H #define DATAPATH_H 1 @@ -15,158 +23,170 @@ #include #include #include -#include #include -#include -#include "flow.h" -#include "dp_sysfs.h" +#include -/* Mask for the priority bits in a vlan header. If we ever merge upstream - * then this should go into include/linux/if_vlan.h. */ -#define VLAN_PCP_MASK 0xe000 - -#define DP_MAX_PORTS 1024 -#define DP_MAX_GROUPS 16 - -#define DP_L2_BITS (PAGE_SHIFT - ilog2(sizeof(struct dp_bucket*))) -#define DP_L2_SIZE (1 << DP_L2_BITS) -#define DP_L2_SHIFT 0 +#include "checksum.h" +#include "compat.h" +#include "flow.h" +#include "tunnel.h" +#include "vlan.h" +#include "vport.h" -#define DP_L1_BITS (PAGE_SHIFT - ilog2(sizeof(struct dp_bucket**))) -#define DP_L1_SIZE (1 << DP_L1_BITS) -#define DP_L1_SHIFT DP_L2_BITS +#define DP_MAX_PORTS USHRT_MAX +#define DP_VPORT_HASH_BUCKETS 1024 -/* For 4 kB pages, this is 1,048,576 on 32-bit or 262,144 on 64-bit. */ -#define DP_MAX_BUCKETS (DP_L1_SIZE * DP_L2_SIZE) +#define SAMPLE_ACTION_DEPTH 3 /** - * struct dp_table - flow table - * @n_buckets: number of buckets (a power of 2 between %DP_L1_SIZE and - * %DP_MAX_BUCKETS) - * @buckets: pointer to @n_buckets/%DP_L1_SIZE pointers to %DP_L1_SIZE pointers - * to buckets - * @hash_seed: random number used for flow hashing, to make the hash - * distribution harder to predict - * @rcu: RCU callback structure - * - * The @buckets array is logically an array of pointers to buckets. It is - * broken into two levels to avoid the need to kmalloc() any object larger than - * a single page or to use vmalloc(). @buckets is always nonnull, as is each - * @buckets[i], but each @buckets[i][j] is nonnull only if the specified hash - * bucket is nonempty (for 0 <= i < @n_buckets/%DP_L1_SIZE, 0 <= j < - * %DP_L1_SIZE). + * 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). */ -struct dp_table { - unsigned int n_buckets; - struct dp_bucket ***buckets; - unsigned int hash_seed; - struct rcu_head rcu; +struct dp_stats_percpu { + u64 n_hit; + u64 n_missed; + u64 n_lost; + struct u64_stats_sync sync; }; /** - * struct dp_bucket - single bucket within datapath flow table - * @rcu: RCU callback structure - * @n_flows: number of flows in @flows[] array - * @flows: array of @n_flows pointers to flows + * struct datapath - datapath for flow-based packet switching + * @rcu: RCU callback head for deferred destruction. + * @list_node: Element in global 'dps' list. + * @n_flows: Number of flows currently in flow table. + * @table: Current flow table. Protected by genl_lock and RCU. + * @ports: Hash table for ports. %OVSP_LOCAL port always exists. Protected by + * RTNL and RCU. + * @stats_percpu: Per-CPU datapath statistics. + * @net: Reference to net namespace. * - * The expected number of flows per bucket is 1, but this allows for an - * arbitrary number of collisions. + * Context: See the comment on locking at the top of datapath.c for additional + * locking information. */ -struct dp_bucket { +struct datapath { struct rcu_head rcu; - unsigned int n_flows; - struct sw_flow *flows[]; -}; + struct list_head list_node; -#define DP_N_QUEUES 2 -#define DP_MAX_QUEUE_LEN 100 + /* Flow table. */ + struct flow_table __rcu *table; -struct dp_stats_percpu { - u64 n_frags; - u64 n_hit; - u64 n_missed; - u64 n_lost; -}; + /* Switch ports. */ + struct hlist_head *ports; -struct dp_port_group { - struct rcu_head rcu; - int n_ports; - u16 ports[]; -}; + /* Stats. */ + struct dp_stats_percpu __percpu *stats_percpu; -struct datapath { - struct mutex mutex; - int dp_idx; +#ifdef CONFIG_NET_NS + /* Network namespace ref. */ + struct net *net; +#endif +}; - struct kobject ifobj; +/** + * struct ovs_skb_cb - OVS data in skb CB + * @flow: The flow associated with this packet. May be %NULL if no flow. + * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the + * packet is not being tunneled. + * @ip_summed: Consistently stores L4 checksumming status across different + * kernel versions. + * @csum_start: Stores the offset from which to start checksumming independent + * of the transport header on all kernel versions. + * packet was not received on a tunnel. + * @vlan_tci: Provides a substitute for the skb->vlan_tci field on kernels + * before 2.6.27. + */ +struct ovs_skb_cb { + struct sw_flow *flow; + struct ovs_key_ipv4_tunnel *tun_key; +#ifdef NEED_CSUM_NORMALIZE + enum csum_type ip_summed; + u16 csum_start; +#endif +#ifdef NEED_VLAN_FIELD + u16 vlan_tci; +#endif +}; +#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb) - int drop_frags; +/** + * struct dp_upcall - metadata to include with a packet to send to userspace + * @cmd: One of %OVS_PACKET_CMD_*. + * @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull. + * @userdata: If nonnull, its u64 value is extracted and passed to userspace as + * %OVS_PACKET_ATTR_USERDATA. + * @portid: Netlink PID to which packet should be sent. If @portid is 0 then no + * packet is sent and the packet is accounted in the datapath's @n_lost + * counter. + */ +struct dp_upcall_info { + u8 cmd; + const struct sw_flow_key *key; + const struct nlattr *userdata; + u32 portid; +}; - /* Queued data. */ - struct sk_buff_head queues[DP_N_QUEUES]; - wait_queue_head_t waitqueue; +/** + * struct ovs_net - Per net-namespace data for ovs. + * @dps: List of datapaths to enable dumping them all out. + * Protected by genl_mutex. + * @vport_net: Per network namespace data for vport. + */ +struct ovs_net { + struct list_head dps; + struct vport_net vport_net; +}; - /* Flow table. */ - unsigned int n_flows; - struct dp_table *table; +extern int ovs_net_id; - /* Port groups. */ - struct dp_port_group *groups[DP_MAX_GROUPS]; +static inline struct net *ovs_dp_get_net(struct datapath *dp) +{ + return read_pnet(&dp->net); +} - /* Switch ports. */ - unsigned int n_ports; - struct net_bridge_port *ports[DP_MAX_PORTS]; - struct list_head port_list; /* All ports, including local_port. */ +static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) +{ + write_pnet(&dp->net, net); +} - /* Stats. */ - struct dp_stats_percpu *stats_percpu; -}; +struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no); -struct net_bridge_port { - u16 port_no; - struct datapath *dp; - struct net_device *dev; - struct kobject kobj; - char linkname[IFNAMSIZ]; - struct list_head node; /* Element in datapath.ports. */ -}; +static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) +{ + WARN_ON_ONCE(!rcu_read_lock_held()); + return ovs_lookup_vport(dp, port_no); +} -extern struct notifier_block dp_device_notifier; -extern int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd); - -/* Flow table. */ -struct dp_table *dp_table_create(unsigned int n_buckets); -void dp_table_destroy(struct dp_table *, int free_flows); -struct sw_flow *dp_table_lookup(struct dp_table *, const struct odp_flow_key *); -int dp_table_insert(struct dp_table *, struct sw_flow *); -int dp_table_delete(struct dp_table *, struct sw_flow *); -int dp_table_expand(struct datapath *); -int dp_table_flush(struct datapath *); -int dp_table_foreach(struct dp_table *table, - int (*callback)(struct sw_flow *flow, void *aux), - void *aux); - -void dp_process_received_packet(struct sk_buff *, struct net_bridge_port *); -int dp_del_port(struct net_bridge_port *); -int dp_output_control(struct datapath *, struct sk_buff *, int, u32 arg); -int dp_min_mtu(const struct datapath *dp); - -struct datapath *get_dp(int dp_idx); - -static inline const char *dp_name(const struct datapath *dp) +static inline struct vport *ovs_vport_rtnl_rcu(const struct datapath *dp, int port_no) { - return dp->ports[ODPP_LOCAL]->dev->name; + WARN_ON_ONCE(!rcu_read_lock_held() && !rtnl_is_locked()); + return ovs_lookup_vport(dp, port_no); } -#ifdef CONFIG_XEN -int skb_checksum_setup(struct sk_buff *skb); -#else -static inline int skb_checksum_setup(struct sk_buff *skb) +static inline struct vport *ovs_vport_rtnl(const struct datapath *dp, int port_no) { - return 0; + ASSERT_RTNL(); + return ovs_lookup_vport(dp, port_no); } -#endif -int vswitch_skb_checksum_setup(struct sk_buff *skb); +extern struct notifier_block ovs_dp_device_notifier; +extern struct genl_multicast_group ovs_dp_vport_multicast_group; + +void ovs_dp_process_received_packet(struct vport *, struct sk_buff *); +void ovs_dp_detach_port(struct vport *); +int ovs_dp_upcall(struct datapath *, struct sk_buff *, + const struct dp_upcall_info *); + +const char *ovs_dp_name(const struct datapath *dp); +struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 portid, u32 seq, + u8 cmd); +int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb); #endif /* datapath.h */