2 * net/tipc/port.h: Include file for TIPC port code
4 * Copyright (c) 1994-2006, Ericsson AB
5 * Copyright (c) 2004-2005, Wind River Systems
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45 #include "node_subscr.h"
48 * struct user_port - TIPC user port (used with native API)
49 * @user_ref: id of user who created user port
50 * @usr_handle: user-specified field
51 * @ref: object reference to associated TIPC port
52 * <various callback routines>
53 * @uport_list: adjacent user ports in list of ports held by user
60 tipc_msg_err_event err_cb;
61 tipc_named_msg_err_event named_err_cb;
62 tipc_conn_shutdown_event conn_err_cb;
63 tipc_msg_event msg_cb;
64 tipc_named_msg_event named_msg_cb;
65 tipc_conn_msg_event conn_msg_cb;
66 tipc_continue_event continue_event_cb;
67 struct list_head uport_list;
71 * struct port - TIPC port structure
72 * @publ: TIPC port info available to privileged users
73 * @port_list: adjacent ports in TIPC's global list of ports
74 * @dispatcher: ptr to routine which handles received messages
75 * @wakeup: ptr to routine to call when port is no longer congested
76 * @user_port: ptr to user port associated with port (if any)
77 * @wait_list: adjacent ports in list of ports waiting on link congestion
78 * @congested_link: ptr to congested link port is waiting on
82 * @publications: list of publications for port
83 * @pub_count: total # of publications port has made during its lifetime
84 * @max_pkt: maximum packet size "hint" used when building messages sent by port
89 * @subscription: "node down" subscription used to terminate failed connections
93 struct tipc_port publ;
94 struct list_head port_list;
95 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
96 void (*wakeup)(struct tipc_port *);
97 struct user_port *user_port;
98 struct list_head wait_list;
99 struct link *congested_link;
103 struct list_head publications;
107 u32 probing_interval;
109 struct timer_list timer;
110 struct node_subscr subscription;
113 extern spinlock_t tipc_port_list_lock;
116 int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
117 struct iovec const *msg_sect);
118 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
119 struct iovec const *msg_sect, u32 num_sect,
121 struct sk_buff *tipc_port_get_ports(void);
122 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
123 void tipc_port_recv_proto_msg(struct sk_buff *buf);
124 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
125 void tipc_port_reinit(void);
128 * tipc_port_lock - lock port instance referred to and return its pointer
131 static inline struct port *tipc_port_lock(u32 ref)
133 return (struct port *)tipc_ref_lock(ref);
137 * tipc_port_unlock - unlock a port instance
139 * Can use pointer instead of tipc_ref_unlock() since port is already locked.
142 static inline void tipc_port_unlock(struct port *p_ptr)
144 spin_unlock_bh(p_ptr->publ.lock);
147 static inline struct port* tipc_port_deref(u32 ref)
149 return (struct port *)tipc_ref_deref(ref);
152 static inline u32 tipc_peer_port(struct port *p_ptr)
154 return msg_destport(&p_ptr->publ.phdr);
157 static inline u32 tipc_peer_node(struct port *p_ptr)
159 return msg_destnode(&p_ptr->publ.phdr);
162 static inline int tipc_port_congested(struct port *p_ptr)
164 return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
168 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
171 static inline int tipc_port_recv_msg(struct sk_buff *buf)
174 struct tipc_msg *msg = buf_msg(buf);
175 u32 destport = msg_destport(msg);
176 u32 dsz = msg_data_sz(msg);
179 /* forward unresolved named message */
180 if (unlikely(!destport)) {
181 tipc_net_route_msg(buf);
185 /* validate destination & pass to port, otherwise reject message */
186 p_ptr = tipc_port_lock(destport);
188 if (likely(p_ptr->publ.connected)) {
189 if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
190 (unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
191 (unlikely(!msg_connected(msg)))) {
192 err = TIPC_ERR_NO_PORT;
193 tipc_port_unlock(p_ptr);
197 err = p_ptr->dispatcher(&p_ptr->publ, buf);
198 tipc_port_unlock(p_ptr);
202 err = TIPC_ERR_NO_PORT;
205 dbg("port->rejecting, err = %x..\n",err);
206 return tipc_reject_msg(buf, err);