1 /* Copyright (c) 2011, 2012, 2013 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
24 #include "ofp-actions.h"
31 #define MAX_SLAVES 8 /* Maximum supported by this test framework. */
42 struct slave slaves[MAX_SLAVES];
46 slave_lookup(struct slave_group *sg, ofp_port_t slave_id)
50 for (i = 0; i < sg->n_slaves; i++) {
51 if (sg->slaves[i].slave_id == slave_id) {
52 return &sg->slaves[i];
60 slave_enabled_cb(ofp_port_t slave_id, void *aux)
64 slave = slave_lookup(aux, slave_id);
65 return slave ? slave->enabled : false;
68 static struct ofpact_bundle *
69 parse_bundle_actions(char *actions)
71 struct ofpact_bundle *bundle;
72 struct ofpbuf ofpacts;
73 struct ofpact *action;
76 ofpbuf_init(&ofpacts, 0);
77 error = bundle_parse_load(actions, &ofpacts);
79 ovs_fatal(0, "%s", error);
82 action = ofpacts.data;
83 bundle = ofpact_get_BUNDLE(xmemdup(action, action->len));
84 ofpbuf_uninit(&ofpacts);
86 if (bundle->n_slaves > MAX_SLAVES) {
87 ovs_fatal(0, "At most %u slaves are supported", MAX_SLAVES);
94 mask_str(uint8_t mask, size_t n_bits)
99 n_bits = MIN(n_bits, 8);
100 for (i = 0; i < n_bits; i++) {
101 str[i] = (1 << i) & mask ? '1' : '0';
109 main(int argc, char *argv[])
112 struct ofpact_bundle *bundle;
114 size_t i, n_permute, old_n_enabled;
115 struct slave_group sg;
118 set_program_name(argv[0]);
122 ovs_fatal(0, "usage: %s bundle_action", program_name);
125 bundle = parse_bundle_actions(argv[1]);
127 /* Generate 'slaves' array. */
129 for (i = 0; i < bundle->n_slaves; i++) {
130 ofp_port_t slave_id = bundle->slaves[i];
132 if (slave_lookup(&sg, slave_id)) {
133 ovs_fatal(0, "Redundant slaves are not supported. ");
136 sg.slaves[sg.n_slaves].slave_id = slave_id;
140 /* Generate flows. */
141 flows = xmalloc(N_FLOWS * sizeof *flows);
142 for (i = 0; i < N_FLOWS; i++) {
143 random_bytes(&flows[i], sizeof flows[i]);
144 flows[i].regs[0] = ofp_to_u16(OFPP_NONE);
147 /* Cycles through each possible liveness permutation for the given
148 * n_slaves. The initial state is equivalent to all slaves down, so we
149 * skip it by starting at i = 1. We do one extra iteration to cover
150 * transitioning from the final state back to the initial state. */
153 n_permute = 1 << sg.n_slaves;
154 for (i = 1; i <= n_permute + 1; i++) {
156 size_t j, n_enabled, changed;
157 double disruption, perfect;
161 mask = i % n_permute;
163 /* Gray coding ensures that in each iteration exactly one slave
164 * changes its liveness. This makes the expected disruption a bit
165 * easier to calculate, and is likely similar to how failures will be
166 * experienced in the wild. */
167 mask = mask ^ (mask >> 1);
169 /* Initialize slaves. */
171 for (j = 0; j < sg.n_slaves; j++) {
172 slave = &sg.slaves[j];
173 slave->flow_count = 0;
174 slave->enabled = ((1 << j) & mask) != 0;
176 if (slave->enabled) {
182 for (j = 0; j < sg.n_slaves; j++) {
183 if (sg.slaves[j].enabled) {
190 for (j = 0; j < N_FLOWS; j++) {
191 struct flow *flow = &flows[j];
192 ofp_port_t old_slave_id, ofp_port;
193 struct flow_wildcards wc;
195 old_slave_id = u16_to_ofp(flow->regs[0]);
196 ofp_port = bundle_execute(bundle, flow, &wc, slave_enabled_cb,
198 flow->regs[0] = ofp_to_u16(ofp_port);
200 if (ofp_port != OFPP_NONE) {
201 slave_lookup(&sg, ofp_port)->flow_count++;
204 if (old_slave_id != ofp_port) {
209 if (bundle->algorithm == NX_BD_ALG_ACTIVE_BACKUP) {
210 perfect = active == old_active ? 0.0 : 1.0;
212 if (old_n_enabled || n_enabled) {
213 perfect = 1.0 / MAX(old_n_enabled, n_enabled);
215 /* This will happen when 'sg.n_slaves' is 0. */
220 disruption = changed / (double)N_FLOWS;
221 printf("%s: disruption=%.2f (perfect=%.2f)",
222 mask_str(mask, sg.n_slaves), disruption, perfect);
224 for (j = 0 ; j < sg.n_slaves; j++) {
225 struct slave *slave = &sg.slaves[j];
228 flow_percent = slave->flow_count / (double)N_FLOWS;
229 printf( " %.2f", flow_percent);
231 if (slave->enabled) {
234 if (bundle->algorithm == NX_BD_ALG_ACTIVE_BACKUP) {
235 perfect_fp = j == active ? 1.0 : 0.0;
237 perfect_fp = 1.0 / n_enabled;
240 if (fabs(flow_percent - perfect_fp) >= .01) {
241 fprintf(stderr, "%s: slave %d: flow_percentage=%.5f for"
242 " differs from perfect=%.5f by more than .01\n",
243 mask_str(mask, sg.n_slaves), slave->slave_id,
244 flow_percent, perfect_fp);
247 } else if (slave->flow_count) {
248 fprintf(stderr, "%s: slave %d: disabled slave received"
249 " flows.\n", mask_str(mask, sg.n_slaves),
256 if (fabs(disruption - perfect) >= .01) {
257 fprintf(stderr, "%s: disruption=%.5f differs from perfect=%.5f by"
258 " more than .01\n", mask_str(mask, sg.n_slaves),
259 disruption, perfect);
264 old_n_enabled = n_enabled;