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
55 LINK_ESTABLISH_EVT = 0xec1ab1e,
56 LINK_PEER_RESET_EVT = 0x9eed0e,
57 LINK_FAILURE_EVT = 0xfa110e,
58 LINK_RESET_EVT = 0x10ca1d0e,
59 LINK_FAILOVER_BEGIN_EVT = 0xfa110bee,
60 LINK_FAILOVER_END_EVT = 0xfa110ede,
61 LINK_SYNCH_BEGIN_EVT = 0xc1ccbee,
62 LINK_SYNCH_END_EVT = 0xc1ccede
65 /* Events returned from link at packet reception or at timeout
69 TIPC_LINK_DOWN_EVT = (1 << 1),
70 TIPC_LINK_SND_BC_ACK = (1 << 2)
73 /* Starting value for maximum packet size negotiation on unicast links
74 * (unless bearer MTU is less)
76 #define MAX_PKT_DEFAULT 1500
79 u32 sent_info; /* used in counting # sent packets */
80 u32 recv_info; /* used in counting # recv'd packets */
97 u32 link_congs; /* # port sends blocked by congestion */
100 u32 max_queue_sz; /* send queue size high water mark */
101 u32 accu_queue_sz; /* used for send queue size profiling */
102 u32 queue_sz_counts; /* used for send queue size profiling */
103 u32 msg_length_counts; /* used for message length profiling */
104 u32 msg_lengths_total; /* used for message length profiling */
105 u32 msg_length_profile[7]; /* used for msg. length profiling */
109 * struct tipc_link - TIPC link data structure
110 * @addr: network address of link's peer node
111 * @name: link name character string
112 * @media_addr: media address to use when sending messages over link
114 * @net: pointer to namespace struct
115 * @refcnt: reference counter for permanent references (owner node & timer)
116 * @peer_session: link session # being used by peer end of link
117 * @peer_bearer_id: bearer id used by link's peer endpoint
118 * @bearer_id: local bearer id used by link
119 * @tolerance: minimum link continuity loss needed to reset link [in ms]
120 * @keepalive_intv: link keepalive timer interval
121 * @abort_limit: # of unacknowledged continuity probes needed to reset link
122 * @state: current state of link FSM
123 * @peer_caps: bitmap describing capabilities of peer node
124 * @silent_intv_cnt: # of timer intervals without any reception from peer
125 * @proto_msg: template for control messages generated by link
126 * @pmsg: convenience pointer to "proto_msg" field
127 * @priority: current link priority
128 * @net_plane: current link network plane ('A' through 'H')
129 * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
130 * @exp_msg_count: # of tunnelled messages expected during link changeover
131 * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
132 * @mtu: current maximum packet size for this link
133 * @advertised_mtu: advertised own mtu when link is being established
134 * @transmitq: queue for sent, non-acked messages
135 * @backlogq: queue for messages waiting to be sent
136 * @snt_nxt: next sequence number to use for outbound messages
137 * @last_retransmitted: sequence number of most recently retransmitted message
138 * @stale_count: # of identical retransmit requests made by peer
139 * @ackers: # of peers that needs to ack each packet before it can be released
140 * @acked: # last packet acked by a certain peer. Used for broadcast.
141 * @rcv_nxt: next sequence number to expect for inbound messages
142 * @deferred_queue: deferred queue saved OOS b'cast message received from node
143 * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
144 * @inputq: buffer queue for messages to be delivered upwards
145 * @namedq: buffer queue for name table messages to be delivered upwards
146 * @next_out: ptr to first unsent outbound message in queue
147 * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
148 * @long_msg_seq_no: next identifier to use for outbound fragmented messages
149 * @reasm_buf: head of partially reassembled inbound message fragments
150 * @bc_rcvr: marks that this is a broadcast receiver link
151 * @stats: collects statistics regarding link activity
155 char name[TIPC_MAX_LINK_NAME];
156 struct tipc_media_addr *media_addr;
159 /* Management and link supervision data */
164 unsigned long keepalive_intv;
171 unchar hdr[INT_H_SIZE];
172 unchar body[TIPC_MAX_IF_NAME];
174 struct tipc_msg *pmsg;
180 struct sk_buff *failover_reasm_skb;
182 /* Max packet negotiation */
187 struct sk_buff_head transmq;
188 struct sk_buff_head backlogq;
201 struct sk_buff_head deferdq;
202 struct sk_buff_head *inputq;
203 struct sk_buff_head *namedq;
205 /* Congestion handling */
206 struct sk_buff_head wakeupq;
208 /* Fragmentation/reassembly */
209 struct sk_buff *reasm_buf;
214 struct tipc_link *bc_rcvlink;
215 struct tipc_link *bc_sndlink;
220 struct tipc_stats stats;
223 bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
224 int tolerance, char net_plane, u32 mtu, int priority,
225 int window, u32 session, u32 ownnode, u32 peer,
227 struct tipc_link *bc_sndlink,
228 struct tipc_link *bc_rcvlink,
229 struct sk_buff_head *inputq,
230 struct sk_buff_head *namedq,
231 struct tipc_link **link);
232 bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
233 int mtu, int window, u16 peer_caps,
234 struct sk_buff_head *inputq,
235 struct sk_buff_head *namedq,
236 struct tipc_link *bc_sndlink,
237 struct tipc_link **link);
238 void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
239 int mtyp, struct sk_buff_head *xmitq);
240 void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
241 int tipc_link_fsm_evt(struct tipc_link *l, int evt);
242 void tipc_link_reset_fragments(struct tipc_link *l_ptr);
243 bool tipc_link_is_up(struct tipc_link *l);
244 bool tipc_link_peer_is_down(struct tipc_link *l);
245 bool tipc_link_is_reset(struct tipc_link *l);
246 bool tipc_link_is_establishing(struct tipc_link *l);
247 bool tipc_link_is_synching(struct tipc_link *l);
248 bool tipc_link_is_failingover(struct tipc_link *l);
249 bool tipc_link_is_blocked(struct tipc_link *l);
250 void tipc_link_set_active(struct tipc_link *l, bool active);
251 void tipc_link_reset(struct tipc_link *l_ptr);
252 int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,
253 struct sk_buff_head *xmitq);
254 void tipc_link_set_queue_limits(struct tipc_link *l, u32 window);
256 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
257 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
258 int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info);
259 int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info);
260 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
261 int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
262 int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
263 struct sk_buff_head *xmitq);
264 int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
265 void tipc_link_add_bc_peer(struct tipc_link *snd_l,
266 struct tipc_link *uc_l,
267 struct sk_buff_head *xmitq);
268 void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
269 struct tipc_link *rcv_l,
270 struct sk_buff_head *xmitq);
271 int tipc_link_bc_peers(struct tipc_link *l);
272 void tipc_link_set_mtu(struct tipc_link *l, int mtu);
273 int tipc_link_mtu(struct tipc_link *l);
274 void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
275 struct sk_buff_head *xmitq);
276 void tipc_link_build_bc_sync_msg(struct tipc_link *l,
277 struct sk_buff_head *xmitq);
278 void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr);
279 void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
280 struct sk_buff_head *xmitq);
281 int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
282 struct sk_buff_head *xmitq);