X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=datapath%2Fdatapath.h;h=abc6aeab2af415a77811eef5f39df955711d915f;hb=b524945e78804bf4ef46abb936eba829538f8e29;hp=7548ba26521e49b9bd63287e456c14b381a24da0;hpb=a6057323869de5b323d1c75e678b6a0fe0e8addd;p=sliver-openvswitch.git diff --git a/datapath/datapath.h b/datapath/datapath.h index 7548ba265..abc6aeab2 100644 --- a/datapath/datapath.h +++ b/datapath/datapath.h @@ -1,5 +1,5 @@ /* - * 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 @@ -16,11 +16,15 @@ #include #include #include +#include #include #include #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 @@ -29,64 +33,28 @@ #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 - -#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 - -/* 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) - -/** - * 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_table { - unsigned int n_buckets; - struct dp_bucket ***buckets; - unsigned int hash_seed; - struct rcu_head rcu; -}; +#define DP_N_QUEUES 3 +#define DP_MAX_QUEUE_LEN 100 /** - * 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 - * - * The expected number of flows per bucket is 1, but this allows for an - * arbitrary number of collisions. + * 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_bucket { - struct rcu_head rcu; - unsigned int n_flows; - struct sw_flow *flows[]; -}; - -#define DP_N_QUEUES 2 -#define DP_MAX_QUEUE_LEN 100 - struct dp_stats_percpu { u64 n_frags; u64 n_hit; u64 n_missed; u64 n_lost; + seqcount_t seqlock; }; struct dp_port_group { @@ -95,10 +63,29 @@ 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//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; - struct kobject ifobj; int drop_frags; @@ -108,67 +95,93 @@ struct datapath { 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//brport. + * @linkname: The name of the link from /sys/class/net//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; + struct vport *vport; struct kobject kobj; char linkname[IFNAMSIZ]; - struct list_head node; /* Element in datapath.ports. */ + 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 *); -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 *); +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 -int vswitch_skb_checksum_setup(struct sk_buff *skb); +void compute_ip_summed(struct sk_buff *skb, bool xmit); void forward_ip_summed(struct sk_buff *skb); #endif /* datapath.h */