Skip to content
Snippets Groups Projects
Select Git revision
  • a65878d6f00bb2d791348ae90dcc2ede1dbe2b91
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

datapath.h

Blame
  • datapath.h 7.35 KiB
    /* SPDX-License-Identifier: GPL-2.0-only */
    /*
     * Copyright (c) 2007-2014 Nicira, Inc.
     */
    
    #ifndef DATAPATH_H
    #define DATAPATH_H 1
    
    #include <asm/page.h>
    #include <linux/kernel.h>
    #include <linux/mutex.h>
    #include <linux/netdevice.h>
    #include <linux/skbuff.h>
    #include <linux/u64_stats_sync.h>
    #include <net/ip_tunnels.h>
    
    #include "conntrack.h"
    #include "flow.h"
    #include "flow_table.h"
    #include "meter.h"
    #include "vport-internal_dev.h"
    
    #define DP_MAX_PORTS                USHRT_MAX
    #define DP_VPORT_HASH_BUCKETS       1024
    #define DP_MASKS_REBALANCE_INTERVAL 4000
    
    /**
     * 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;
    
    	u32 user_features;
    
    	u32 max_headroom;
    
    	/* Switch meters. */
    	struct dp_meter_table meter_tbl;
    };
    
    /**
     * struct ovs_skb_cb - OVS data in skb CB
     * @input_vport: The original vport packet came in on. This value is cached
     * when a packet is received by OVS.
     * @mru: The maximum received fragement size; 0 if the packet is not
     * fragmented.
     * @acts_origlen: The netlink size of the flow actions applied to this skb.
     * @cutlen: The number of bytes from the packet end to be removed.
     */
    struct ovs_skb_cb {
    	struct vport		*input_vport;
    	u16			mru;
    	u16			acts_origlen;
    	u32			cutlen;
    };
    #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
    
    /**
     * struct dp_upcall - metadata to include with a packet to send to userspace
     * @cmd: One of %OVS_PACKET_CMD_*.
     * @userdata: If nonnull, its variable-length value is passed to userspace as
     * %OVS_PACKET_ATTR_USERDATA.
     * @portid: Netlink portid 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.
     * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
     * @mru: If not zero, Maximum received IP fragment size.
     */
    struct dp_upcall_info {
    	struct ip_tunnel_info *egress_tun_info;
    	const struct nlattr *userdata;
    	const struct nlattr *actions;
    	int actions_len;
    	u32 portid;
    	u8 cmd;
    	u16 mru;
    };
    
    /**
     * struct ovs_net - Per net-namespace data for ovs.
     * @dps: List of datapaths to enable dumping them all out.
     * Protected by genl_mutex.
     */
    struct ovs_net {
    	struct list_head dps;
    	struct work_struct dp_notify_work;
    	struct delayed_work masks_rebalance;
    #if	IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
    	struct ovs_ct_limit_info *ct_limit_info;
    #endif
    
    	/* Module reference for configuring conntrack. */
    	bool xt_label;
    };
    
    /**
     * enum ovs_pkt_hash_types - hash info to include with a packet
     * to send to userspace.
     * @OVS_PACKET_HASH_SW_BIT: indicates hash was computed in software stack.
     * @OVS_PACKET_HASH_L4_BIT: indicates hash is a canonical 4-tuple hash
     * over transport ports.
     */
    enum ovs_pkt_hash_types {
    	OVS_PACKET_HASH_SW_BIT = (1ULL << 32),
    	OVS_PACKET_HASH_L4_BIT = (1ULL << 33),
    };
    
    extern unsigned int ovs_net_id;
    void ovs_lock(void);
    void ovs_unlock(void);
    
    #ifdef CONFIG_LOCKDEP
    int lockdep_ovsl_is_held(void);
    #else
    #define lockdep_ovsl_is_held()	1
    #endif
    
    #define ASSERT_OVSL()		WARN_ON(!lockdep_ovsl_is_held())
    #define ovsl_dereference(p)					\
    	rcu_dereference_protected(p, lockdep_ovsl_is_held())
    #define rcu_dereference_ovsl(p)					\
    	rcu_dereference_check(p, lockdep_ovsl_is_held())
    
    static inline struct net *ovs_dp_get_net(const struct datapath *dp)
    {
    	return read_pnet(&dp->net);
    }
    
    static inline void ovs_dp_set_net(struct datapath *dp, struct net *net)
    {
    	write_pnet(&dp->net, net);
    }
    
    struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
    
    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);
    }
    
    static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no)
    {
    	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
    	return ovs_lookup_vport(dp, port_no);
    }
    
    static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no)
    {
    	ASSERT_OVSL();
    	return ovs_lookup_vport(dp, port_no);
    }
    
    /* Must be called with rcu_read_lock. */
    static inline struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
    {
    	struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
    
    	if (dev) {
    		struct vport *vport = ovs_internal_dev_get_vport(dev);
    
    		if (vport)
    			return vport->dp;
    	}
    
    	return NULL;
    }
    
    /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
     * returned dp pointer valid.
     */
    static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
    {
    	struct datapath *dp;
    
    	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
    	rcu_read_lock();
    	dp = get_dp_rcu(net, dp_ifindex);
    	rcu_read_unlock();
    
    	return dp;
    }
    
    extern struct notifier_block ovs_dp_device_notifier;
    extern struct genl_family dp_vport_genl_family;
    
    DECLARE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
    
    void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
    void ovs_dp_detach_port(struct vport *);
    int ovs_dp_upcall(struct datapath *, struct sk_buff *,
    		  const struct sw_flow_key *, const struct dp_upcall_info *,
    		  uint32_t cutlen);
    
    const char *ovs_dp_name(const struct datapath *dp);
    struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
    					 u32 portid, u32 seq, u8 cmd);
    
    int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
    			const struct sw_flow_actions *, struct sw_flow_key *);
    
    void ovs_dp_notify_wq(struct work_struct *work);
    
    int action_fifos_init(void);
    void action_fifos_exit(void);
    
    /* 'KEY' must not have any bits set outside of the 'MASK' */
    #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
    #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK))
    
    #define OVS_NLERR(logging_allowed, fmt, ...)			\
    do {								\
    	if (logging_allowed && net_ratelimit())			\
    		pr_info("netlink: " fmt "\n", ##__VA_ARGS__);	\
    } while (0)
    #endif /* datapath.h */