1 /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
4 * We are making the OpenFlow specification and associated documentation
5 * (Software) available for public use and benefit with the expectation
6 * that others will use, modify and enhance the Software and contribute
7 * those enhancements back to the community. However, since we would
8 * like to make the Software available for broadest use, with as few
9 * restrictions as possible permission is hereby granted, free of
10 * charge, to any person obtaining a copy of this Software to deal in
11 * the Software under the copyrights without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
24 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
26 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The name and trademarks of copyright holder(s) may NOT be used in
30 * advertising or publicity pertaining to the Software or any
31 * derivatives without specific, written prior permission.
34 #include "controller.h"
38 #include "poll-loop.h"
39 #include "ofp-print.h"
43 #define THIS_MODULE VLM_controller_connection
46 struct controller_connection {
52 time_t backoff_deadline;
56 struct controller_connection *
57 controller_new(const char *name, bool reliable)
59 struct controller_connection *cc = xmalloc(sizeof *cc);
60 cc->reliable = reliable;
64 cc->backoff_deadline = 0;
70 try_send(struct controller_connection *cc)
73 struct buffer *next = cc->txq.head->next;
74 retval = vconn_send(cc->vconn, cc->txq.head);
78 queue_advance_head(&cc->txq, next);
83 controller_run(struct controller_connection *cc)
86 if (time(0) >= cc->backoff_deadline) {
89 retval = vconn_open(cc->name, &cc->vconn);
91 cc->backoff_deadline = time(0) + cc->backoff;
92 cc->connected = false;
94 VLOG_WARN("%s: connection failed (%s)",
95 cc->name, strerror(retval));
96 controller_disconnect(cc, 0);
99 } else if (!cc->connected) {
100 int error = vconn_connect(cc->vconn);
102 VLOG_WARN("%s: connected", cc->name);
103 if (vconn_is_passive(cc->vconn)) {
104 fatal(0, "%s: passive vconn not supported in switch",
107 cc->connected = true;
108 } else if (error != EAGAIN) {
109 VLOG_WARN("%s: connection failed (%s)",
110 cc->name, strerror(error));
111 controller_disconnect(cc, 0);
114 while (cc->txq.n > 0) {
115 int error = try_send(cc);
116 if (error == EAGAIN) {
119 controller_disconnect(cc, error);
127 controller_run_wait(struct controller_connection *cc)
131 vconn_wait(cc->vconn, WAIT_SEND);
134 poll_timer_wait((cc->backoff_deadline - time(0)) * 1000);
139 controller_disconnect(struct controller_connection *cc, int error)
141 time_t now = time(0);
145 fatal(0, "%s: connection dropped", cc->name);
149 VLOG_WARN("%s: connection dropped (%s)",
150 cc->name, strerror(error));
151 } else if (error == EOF) {
152 VLOG_WARN("%s: connection closed", cc->name);
154 VLOG_WARN("%s: connection dropped", cc->name);
156 vconn_close(cc->vconn);
158 queue_clear(&cc->txq);
161 if (now >= cc->backoff_deadline) {
164 cc->backoff = MIN(60, MAX(1, 2 * cc->backoff));
165 VLOG_WARN("%s: waiting %d seconds before reconnect\n",
166 cc->name, cc->backoff);
168 cc->backoff_deadline = now + cc->backoff;
172 controller_recv(struct controller_connection *cc)
174 if (cc->vconn && cc->connected) {
175 struct buffer *buffer;
176 int error = vconn_recv(cc->vconn, &buffer);
179 } else if (error != EAGAIN) {
180 controller_disconnect(cc, error);
187 controller_recv_wait(struct controller_connection *cc)
190 vconn_wait(cc->vconn, WAIT_RECV);
195 controller_send(struct controller_connection *cc, struct buffer *b)
198 if (cc->txq.n < 128) {
199 queue_push_tail(&cc->txq, b);
200 if (cc->txq.n == 1) {
204 VLOG_WARN("%s: controller queue overflow", cc->name);