/*
- * Copyright (c) 2009 Nicira Networks.
+ * Copyright (c) 2009, 2010 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
#include <asm/page.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
-#include <linux/netlink.h>
#include <linux/netdevice.h>
#include <linux/workqueue.h>
+#include <linux/seqlock.h>
#include <linux/skbuff.h>
+#include <linux/version.h>
#include "flow.h"
#include "dp_sysfs.h"
+struct vport;
+struct dp_port;
+
/* 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 VLAN_PCP_SHIFT 13
-#define DP_MAX_PORTS 256
+#define DP_MAX_PORTS 1024
#define DP_MAX_GROUPS 16
-#define DP_L2_BITS (PAGE_SHIFT - ilog2(sizeof(struct sw_flow*)))
-#define DP_L2_SIZE (1 << DP_L2_BITS)
-#define DP_L2_SHIFT 0
-
-#define DP_L1_BITS (PAGE_SHIFT - ilog2(sizeof(struct sw_flow**)))
-#define DP_L1_SIZE (1 << DP_L1_BITS)
-#define DP_L1_SHIFT DP_L2_BITS
-
-#define DP_MAX_BUCKETS (DP_L1_SIZE * DP_L2_SIZE)
-
-struct dp_table {
- unsigned int n_buckets;
- struct sw_flow ***flows[2];
- struct rcu_head rcu;
-};
-
-#define DP_N_QUEUES 2
+#define DP_N_QUEUES 3
#define DP_MAX_QUEUE_LEN 100
+/**
+ * struct dp_stats_percpu - per-cpu packet processing statistics for a given
+ * datapath.
+ * @n_frags: Number of IP fragments processed by 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_stats_percpu {
u64 n_frags;
u64 n_hit;
u64 n_missed;
u64 n_lost;
+ seqcount_t seqlock;
};
struct dp_port_group {
u16 ports[];
};
+/**
+ * struct datapath - datapath for flow-based packet switching
+ * @mutex: Mutual exclusion for ioctls.
+ * @dp_idx: Datapath number (index into the dps[] array in datapath.c).
+ * @ifobj: Represents /sys/class/net/<devname>/brif.
+ * @drop_frags: Drop all IP fragments if nonzero.
+ * @queues: %DP_N_QUEUES sets of queued packets for userspace to handle.
+ * @waitqueue: Waitqueue, for waiting for new packets in @queues.
+ * @n_flows: Number of flows currently in flow table.
+ * @table: Current flow table (RCU protected).
+ * @groups: Port groups, used by ODPAT_OUTPUT_GROUP action (RCU protected).
+ * @n_ports: Number of ports currently in @ports.
+ * @ports: Map from port number to &struct dp_port. %ODPP_LOCAL port
+ * always exists, other ports may be %NULL.
+ * @port_list: List of all ports in @ports in arbitrary order.
+ * @stats_percpu: Per-CPU datapath statistics.
+ * @sflow_probability: Number of packets out of UINT_MAX to sample to the
+ * %ODPL_SFLOW queue, e.g. (@sflow_probability/UINT_MAX) is the probability of
+ * sampling a given packet.
+ */
struct datapath {
struct mutex mutex;
int dp_idx;
-
-#ifdef SUPPORT_SYSFS
struct kobject ifobj;
-#endif
int drop_frags;
wait_queue_head_t waitqueue;
/* Flow table. */
- unsigned int n_flows;
- struct dp_table *table;
+ struct tbl *table;
/* Port groups. */
struct dp_port_group *groups[DP_MAX_GROUPS];
/* Switch ports. */
unsigned int n_ports;
- struct net_bridge_port *ports[DP_MAX_PORTS];
- struct list_head port_list; /* All ports, including local_port. */
+ struct dp_port *ports[DP_MAX_PORTS];
+ struct list_head port_list;
/* Stats. */
struct dp_stats_percpu *stats_percpu;
+
+ /* sFlow Sampling */
+ unsigned int sflow_probability;
};
-struct net_bridge_port {
+/**
+ * struct dp_port - one port within a datapath
+ * @port_no: Index into @dp's @ports array.
+ * @dp: Datapath to which this port belongs.
+ * @vport: The network device attached to this port. The contents depends on
+ * the device and should be accessed only through the vport_* functions.
+ * @kobj: Represents /sys/class/net/<devname>/brport.
+ * @linkname: The name of the link from /sys/class/net/<datapath>/brif to this
+ * &struct dp_port. (We keep this around so that we can delete it if the
+ * device gets renamed.) Set to the null string when no link exists.
+ * @node: Element in @dp's @port_list.
+ * @sflow_pool: Number of packets that were candidates for sFlow sampling,
+ * regardless of whether they were actually chosen and sent down to userspace.
+ */
+struct dp_port {
u16 port_no;
struct datapath *dp;
- struct net_device *dev;
-#ifdef SUPPORT_SYSFS
+ struct vport *vport;
struct kobject kobj;
-#endif
- struct list_head node; /* Element in datapath.ports. */
+ char linkname[IFNAMSIZ];
+ struct list_head node;
+ atomic_t sflow_pool;
+};
+
+enum csum_type {
+ OVS_CSUM_NONE = 0,
+ OVS_CSUM_UNNECESSARY = 1,
+ OVS_CSUM_COMPLETE = 2,
+ OVS_CSUM_PARTIAL = 3,
};
+/**
+ * struct ovs_skb_cb - OVS data in skb CB
+ * @dp_port: The datapath port on which the skb entered the switch.
+ * @ip_summed: Consistently stores L4 checksumming status across different
+ * kernel versions.
+ * @tun_id: ID (in network byte order) of the tunnel that encapsulated this
+ * packet. It is 0 if the packet was not received on a tunnel.
+ * @is_frag: %true if this packet is an IPv4 fragment, %false otherwise.
+ */
+struct ovs_skb_cb {
+ struct dp_port *dp_port;
+ enum csum_type ip_summed;
+ __be32 tun_id;
+ bool is_frag;
+};
+#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
+
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 *);
-struct sw_flow **dp_table_lookup_for_insert(struct dp_table *, const struct odp_flow_key *);
-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 *);
+void dp_process_received_packet(struct dp_port *, struct sk_buff *);
+int dp_detach_port(struct dp_port *, int may_delete);
int dp_output_control(struct datapath *, struct sk_buff *, int, u32 arg);
int dp_min_mtu(const struct datapath *dp);
+void set_internal_devs_mtu(const struct datapath *dp);
struct datapath *get_dp(int dp_idx);
+const char *dp_name(const struct datapath *dp);
-static inline const char *dp_name(const struct datapath *dp)
-{
- return dp->ports[ODPP_LOCAL]->dev->name;
-}
-
-#ifdef CONFIG_XEN
-int skb_checksum_setup(struct sk_buff *skb);
+#if defined(CONFIG_XEN) && defined(HAVE_PROTO_DATA_VALID)
+int vswitch_skb_checksum_setup(struct sk_buff *skb);
#else
-static inline int skb_checksum_setup(struct sk_buff *skb)
+static inline int vswitch_skb_checksum_setup(struct sk_buff *skb)
{
return 0;
}
#endif
+void compute_ip_summed(struct sk_buff *skb, bool xmit);
+void forward_ip_summed(struct sk_buff *skb);
+
#endif /* datapath.h */
git://git.onelab.eu / sliver-openvswitch.git / blobdiff