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1 | /* |
2 | * net/tipc/link.h: Include file for TIPC link code | |
3 | * | |
4 | * Copyright (c) 2003-2005, Ericsson Research Canada | |
5 | * Copyright (c) 2004-2005, Wind River Systems | |
6 | * Copyright (c) 2005-2006, Ericsson AB | |
7 | * All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions are met: | |
11 | * | |
12 | * Redistributions of source code must retain the above copyright notice, this | |
13 | * list of conditions and the following disclaimer. | |
14 | * Redistributions in binary form must reproduce the above copyright notice, | |
15 | * this list of conditions and the following disclaimer in the documentation | |
16 | * and/or other materials provided with the distribution. | |
17 | * Neither the names of the copyright holders nor the names of its | |
18 | * contributors may be used to endorse or promote products derived from this | |
19 | * software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | * POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef _TIPC_LINK_H | |
35 | #define _TIPC_LINK_H | |
36 | ||
37 | #include "dbg.h" | |
38 | #include "msg.h" | |
39 | #include "bearer.h" | |
40 | #include "node.h" | |
41 | ||
42 | #define PUSH_FAILED 1 | |
43 | #define PUSH_FINISHED 2 | |
44 | ||
45 | /* | |
46 | * Link states | |
47 | */ | |
48 | ||
49 | #define WORKING_WORKING 560810u | |
50 | #define WORKING_UNKNOWN 560811u | |
51 | #define RESET_UNKNOWN 560812u | |
52 | #define RESET_RESET 560813u | |
53 | ||
54 | /* | |
55 | * Starting value for maximum packet size negotiation on unicast links | |
56 | * (unless bearer MTU is less) | |
57 | */ | |
58 | ||
59 | #define MAX_PKT_DEFAULT 1500 | |
60 | ||
61 | /** | |
62 | * struct link - TIPC link data structure | |
63 | * @addr: network address of link's peer node | |
64 | * @name: link name character string | |
65 | * @media_addr: media address to use when sending messages over link | |
66 | * @timer: link timer | |
67 | * @owner: pointer to peer node | |
68 | * @link_list: adjacent links in bearer's list of links | |
69 | * @started: indicates if link has been started | |
70 | * @checkpoint: reference point for triggering link continuity checking | |
71 | * @peer_session: link session # being used by peer end of link | |
72 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
73 | * @b_ptr: pointer to bearer used by link | |
74 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
75 | * @continuity_interval: link continuity testing interval [in ms] | |
76 | * @abort_limit: # of unacknowledged continuity probes needed to reset link | |
77 | * @state: current state of link FSM | |
78 | * @blocked: indicates if link has been administratively blocked | |
79 | * @fsm_msg_cnt: # of protocol messages link FSM has sent in current state | |
80 | * @proto_msg: template for control messages generated by link | |
81 | * @pmsg: convenience pointer to "proto_msg" field | |
82 | * @priority: current link priority | |
83 | * @queue_limit: outbound message queue congestion thresholds (indexed by user) | |
84 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
85 | * @reset_checkpoint: seq # of last acknowledged message at time of link reset | |
86 | * @max_pkt: current maximum packet size for this link | |
87 | * @max_pkt_target: desired maximum packet size for this link | |
88 | * @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target) | |
89 | * @out_queue_size: # of messages in outbound message queue | |
90 | * @first_out: ptr to first outbound message in queue | |
91 | * @last_out: ptr to last outbound message in queue | |
92 | * @next_out_no: next sequence number to use for outbound messages | |
93 | * @last_retransmitted: sequence number of most recently retransmitted message | |
94 | * @stale_count: # of identical retransmit requests made by peer | |
95 | * @next_in_no: next sequence number to expect for inbound messages | |
96 | * @deferred_inqueue_sz: # of messages in inbound message queue | |
97 | * @oldest_deferred_in: ptr to first inbound message in queue | |
98 | * @newest_deferred_in: ptr to last inbound message in queue | |
99 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
100 | * @proto_msg_queue: ptr to (single) outbound control message | |
101 | * @retransm_queue_size: number of messages to retransmit | |
102 | * @retransm_queue_head: sequence number of first message to retransmit | |
103 | * @next_out: ptr to first unsent outbound message in queue | |
104 | * @waiting_ports: linked list of ports waiting for link congestion to abate | |
105 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
106 | * @defragm_buf: list of partially reassembled inbound message fragments | |
107 | * @stats: collects statistics regarding link activity | |
108 | * @print_buf: print buffer used to log link activity | |
109 | */ | |
110 | ||
111 | struct link { | |
112 | u32 addr; | |
113 | char name[TIPC_MAX_LINK_NAME]; | |
114 | struct tipc_media_addr media_addr; | |
115 | struct timer_list timer; | |
116 | struct node *owner; | |
117 | struct list_head link_list; | |
118 | ||
119 | /* Management and link supervision data */ | |
120 | int started; | |
121 | u32 checkpoint; | |
122 | u32 peer_session; | |
123 | u32 peer_bearer_id; | |
124 | struct bearer *b_ptr; | |
125 | u32 tolerance; | |
126 | u32 continuity_interval; | |
127 | u32 abort_limit; | |
128 | int state; | |
129 | int blocked; | |
130 | u32 fsm_msg_cnt; | |
131 | struct { | |
132 | unchar hdr[INT_H_SIZE]; | |
133 | unchar body[TIPC_MAX_IF_NAME]; | |
134 | } proto_msg; | |
135 | struct tipc_msg *pmsg; | |
136 | u32 priority; | |
137 | u32 queue_limit[15]; /* queue_limit[0]==window limit */ | |
138 | ||
139 | /* Changeover */ | |
140 | u32 exp_msg_count; | |
141 | u32 reset_checkpoint; | |
142 | ||
143 | /* Max packet negotiation */ | |
144 | u32 max_pkt; | |
145 | u32 max_pkt_target; | |
146 | u32 max_pkt_probes; | |
147 | ||
148 | /* Sending */ | |
149 | u32 out_queue_size; | |
150 | struct sk_buff *first_out; | |
151 | struct sk_buff *last_out; | |
152 | u32 next_out_no; | |
153 | u32 last_retransmitted; | |
154 | u32 stale_count; | |
155 | ||
156 | /* Reception */ | |
157 | u32 next_in_no; | |
158 | u32 deferred_inqueue_sz; | |
159 | struct sk_buff *oldest_deferred_in; | |
160 | struct sk_buff *newest_deferred_in; | |
161 | u32 unacked_window; | |
162 | ||
163 | /* Congestion handling */ | |
164 | struct sk_buff *proto_msg_queue; | |
165 | u32 retransm_queue_size; | |
166 | u32 retransm_queue_head; | |
167 | struct sk_buff *next_out; | |
168 | struct list_head waiting_ports; | |
169 | ||
170 | /* Fragmentation/defragmentation */ | |
171 | u32 long_msg_seq_no; | |
172 | struct sk_buff *defragm_buf; | |
173 | ||
174 | /* Statistics */ | |
175 | struct { | |
176 | u32 sent_info; /* used in counting # sent packets */ | |
177 | u32 recv_info; /* used in counting # recv'd packets */ | |
178 | u32 sent_states; | |
179 | u32 recv_states; | |
180 | u32 sent_probes; | |
181 | u32 recv_probes; | |
182 | u32 sent_nacks; | |
183 | u32 recv_nacks; | |
184 | u32 sent_acks; | |
185 | u32 sent_bundled; | |
186 | u32 sent_bundles; | |
187 | u32 recv_bundled; | |
188 | u32 recv_bundles; | |
189 | u32 retransmitted; | |
190 | u32 sent_fragmented; | |
191 | u32 sent_fragments; | |
192 | u32 recv_fragmented; | |
193 | u32 recv_fragments; | |
194 | u32 link_congs; /* # port sends blocked by congestion */ | |
195 | u32 bearer_congs; | |
196 | u32 deferred_recv; | |
197 | u32 duplicates; | |
198 | ||
199 | /* for statistical profiling of send queue size */ | |
200 | ||
201 | u32 max_queue_sz; | |
202 | u32 accu_queue_sz; | |
203 | u32 queue_sz_counts; | |
204 | ||
205 | /* for statistical profiling of message lengths */ | |
206 | ||
207 | u32 msg_length_counts; | |
208 | u32 msg_lengths_total; | |
209 | u32 msg_length_profile[7]; | |
210 | #if 0 | |
211 | u32 sent_tunneled; | |
212 | u32 recv_tunneled; | |
213 | #endif | |
214 | } stats; | |
215 | ||
216 | struct print_buf print_buf; | |
217 | }; | |
218 | ||
219 | struct port; | |
220 | ||
221 | struct link *link_create(struct bearer *b_ptr, const u32 peer, | |
222 | const struct tipc_media_addr *media_addr); | |
223 | void link_delete(struct link *l_ptr); | |
224 | void link_changeover(struct link *l_ptr); | |
225 | void link_send_duplicate(struct link *l_ptr, struct link *dest); | |
226 | void link_reset_fragments(struct link *l_ptr); | |
227 | int link_is_up(struct link *l_ptr); | |
228 | int link_is_active(struct link *l_ptr); | |
229 | void link_start(struct link *l_ptr); | |
230 | u32 link_push_packet(struct link *l_ptr); | |
231 | void link_stop(struct link *l_ptr); | |
232 | struct sk_buff *link_cmd_config(const void *req_tlv_area, int req_tlv_space, u16 cmd); | |
233 | struct sk_buff *link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space); | |
234 | struct sk_buff *link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space); | |
235 | void link_reset(struct link *l_ptr); | |
236 | int link_send(struct sk_buff *buf, u32 dest, u32 selector); | |
237 | int link_send_buf(struct link *l_ptr, struct sk_buff *buf); | |
238 | u32 link_get_max_pkt(u32 dest,u32 selector); | |
239 | int link_send_sections_fast(struct port* sender, | |
240 | struct iovec const *msg_sect, | |
241 | const u32 num_sect, | |
242 | u32 destnode); | |
243 | ||
244 | int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf); | |
245 | void link_tunnel(struct link *l_ptr, struct tipc_msg *tnl_hdr, | |
246 | struct tipc_msg *msg, u32 selector); | |
247 | void link_recv_bundle(struct sk_buff *buf); | |
248 | int link_recv_fragment(struct sk_buff **pending, | |
249 | struct sk_buff **fb, | |
250 | struct tipc_msg **msg); | |
251 | void link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int prob, u32 gap, | |
252 | u32 tolerance, u32 priority, u32 acked_mtu); | |
253 | void link_push_queue(struct link *l_ptr); | |
254 | u32 link_defer_pkt(struct sk_buff **head, struct sk_buff **tail, | |
255 | struct sk_buff *buf); | |
256 | void link_wakeup_ports(struct link *l_ptr, int all); | |
257 | void link_set_queue_limits(struct link *l_ptr, u32 window); | |
258 | void link_retransmit(struct link *l_ptr, struct sk_buff *start, u32 retransmits); | |
259 | ||
260 | /* | |
261 | * Link sequence number manipulation routines (uses modulo 2**16 arithmetic) | |
262 | */ | |
263 | ||
264 | static inline u32 mod(u32 x) | |
265 | { | |
266 | return x & 0xffffu; | |
267 | } | |
268 | ||
269 | static inline int between(u32 lower, u32 upper, u32 n) | |
270 | { | |
271 | if ((lower < n) && (n < upper)) | |
272 | return 1; | |
273 | if ((upper < lower) && ((n > lower) || (n < upper))) | |
274 | return 1; | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static inline int less_eq(u32 left, u32 right) | |
279 | { | |
280 | return (mod(right - left) < 32768u); | |
281 | } | |
282 | ||
283 | static inline int less(u32 left, u32 right) | |
284 | { | |
285 | return (less_eq(left, right) && (mod(right) != mod(left))); | |
286 | } | |
287 | ||
288 | static inline u32 lesser(u32 left, u32 right) | |
289 | { | |
290 | return less_eq(left, right) ? left : right; | |
291 | } | |
292 | ||
293 | #endif |