2 * net/tipc/link.h: Include file for TIPC link code
4 * Copyright (c) 1995-2006, 2013-2014, Ericsson AB
5 * Copyright (c) 2004-2005, 2010-2011, Wind River Systems
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40 #include <net/genetlink.h>
44 /* TIPC-specific error codes
46 #define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
48 /* Out-of-range value for link sequence numbers
50 #define INVALID_LINK_SEQ 0x10000
53 /* Link endpoint receive states
61 /* Events occurring at packet reception or at timeout
65 TIPC_LINK_DOWN_EVT = (1 << 1)
68 /* Starting value for maximum packet size negotiation on unicast links
69 * (unless bearer MTU is less)
71 #define MAX_PKT_DEFAULT 1500
74 u32 sent_info; /* used in counting # sent packets */
75 u32 recv_info; /* used in counting # recv'd packets */
92 u32 link_congs; /* # port sends blocked by congestion */
95 u32 max_queue_sz; /* send queue size high water mark */
96 u32 accu_queue_sz; /* used for send queue size profiling */
97 u32 queue_sz_counts; /* used for send queue size profiling */
98 u32 msg_length_counts; /* used for message length profiling */
99 u32 msg_lengths_total; /* used for message length profiling */
100 u32 msg_length_profile[7]; /* used for msg. length profiling */
104 * struct tipc_link - TIPC link data structure
105 * @addr: network address of link's peer node
106 * @name: link name character string
107 * @media_addr: media address to use when sending messages over link
109 * @owner: pointer to peer node
110 * @refcnt: reference counter for permanent references (owner node & timer)
111 * @peer_session: link session # being used by peer end of link
112 * @peer_bearer_id: bearer id used by link's peer endpoint
113 * @bearer_id: local bearer id used by link
114 * @tolerance: minimum link continuity loss needed to reset link [in ms]
115 * @keepalive_intv: link keepalive timer interval
116 * @abort_limit: # of unacknowledged continuity probes needed to reset link
117 * @state: current state of link FSM
118 * @silent_intv_cnt: # of timer intervals without any reception from peer
119 * @proto_msg: template for control messages generated by link
120 * @pmsg: convenience pointer to "proto_msg" field
121 * @priority: current link priority
122 * @net_plane: current link network plane ('A' through 'H')
123 * @exec_mode: transmit/receive mode for link endpoint instance
124 * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
125 * @exp_msg_count: # of tunnelled messages expected during link changeover
126 * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
127 * @mtu: current maximum packet size for this link
128 * @advertised_mtu: advertised own mtu when link is being established
129 * @transmitq: queue for sent, non-acked messages
130 * @backlogq: queue for messages waiting to be sent
131 * @snt_nxt: next sequence number to use for outbound messages
132 * @last_retransmitted: sequence number of most recently retransmitted message
133 * @stale_count: # of identical retransmit requests made by peer
134 * @rcv_nxt: next sequence number to expect for inbound messages
135 * @deferred_queue: deferred queue saved OOS b'cast message received from node
136 * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
137 * @inputq: buffer queue for messages to be delivered upwards
138 * @namedq: buffer queue for name table messages to be delivered upwards
139 * @next_out: ptr to first unsent outbound message in queue
140 * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
141 * @long_msg_seq_no: next identifier to use for outbound fragmented messages
142 * @reasm_buf: head of partially reassembled inbound message fragments
143 * @stats: collects statistics regarding link activity
147 char name[TIPC_MAX_LINK_NAME];
148 struct tipc_media_addr media_addr;
149 struct tipc_node *owner;
151 /* Management and link supervision data */
156 unsigned long keepalive_intv;
161 unchar hdr[INT_H_SIZE];
162 unchar body[TIPC_MAX_IF_NAME];
164 struct tipc_msg *pmsg;
172 u16 failover_checkpt;
173 struct sk_buff *failover_skb;
175 /* Max packet negotiation */
180 struct sk_buff_head transmq;
181 struct sk_buff_head backlogq;
194 struct sk_buff_head deferdq;
195 struct sk_buff_head *inputq;
196 struct sk_buff_head *namedq;
198 /* Congestion handling */
199 struct sk_buff_head wakeupq;
201 /* Fragmentation/reassembly */
202 struct sk_buff *reasm_buf;
205 struct tipc_stats stats;
210 struct tipc_link *tipc_link_create(struct tipc_node *n,
211 struct tipc_bearer *b,
212 const struct tipc_media_addr *maddr,
213 struct sk_buff_head *inputq,
214 struct sk_buff_head *namedq);
215 void tipc_link_delete(struct tipc_link *link);
216 void tipc_link_delete_list(struct net *net, unsigned int bearer_id);
217 void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
218 void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, struct tipc_link *dest);
219 void tipc_link_reset_fragments(struct tipc_link *l_ptr);
220 int tipc_link_is_up(struct tipc_link *l_ptr);
221 int tipc_link_is_active(struct tipc_link *l_ptr);
222 void tipc_link_purge_queues(struct tipc_link *l_ptr);
223 void tipc_link_purge_backlog(struct tipc_link *l);
224 void tipc_link_reset_all(struct tipc_node *node);
225 void tipc_link_reset(struct tipc_link *l_ptr);
226 int __tipc_link_xmit(struct net *net, struct tipc_link *link,
227 struct sk_buff_head *list);
228 int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,
229 struct sk_buff_head *xmitq);
230 void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob,
231 u32 gap, u32 tolerance, u32 priority);
232 void tipc_link_push_packets(struct tipc_link *l_ptr);
233 u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *buf);
234 void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
235 void tipc_link_retransmit(struct tipc_link *l_ptr,
236 struct sk_buff *start, u32 retransmits);
237 struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list,
238 const struct sk_buff *skb);
240 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
241 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
242 int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info);
243 int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info);
244 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
245 void link_prepare_wakeup(struct tipc_link *l);
246 int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
248 static inline u32 link_own_addr(struct tipc_link *l)
250 return msg_prevnode(l->pmsg);