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33 * version: DPDK.L.1.2.3-3
39 #include <sys/queue.h>
41 #include <cmdline_parse.h>
43 #include <rte_memory.h>
44 #include <rte_memzone.h>
45 #include <rte_per_lcore.h>
46 #include <rte_launch.h>
47 #include <rte_atomic.h>
48 #include <rte_tailq.h>
50 #include <rte_per_lcore.h>
51 #include <rte_lcore.h>
59 * - The main test function performs three subtests. The first test
60 * checks that the usual inc/dec/add/sub functions are working
63 * - Initialize 16-bit, 32-bit and 64-bit atomic variables to specific
66 * - These variables are incremented and decremented on each core at
67 * the same time in ``test_atomic_usual()``.
69 * - The function checks that once all lcores finish their function,
70 * the value of the atomic variables are still the same.
72 * - The second test verifies the behavior of "test and set" functions.
74 * - Initialize 16-bit, 32-bit and 64-bit atomic variables to zero.
76 * - Invoke ``test_atomic_tas()`` on each lcore: before doing anything
77 * else. The cores are waiting a synchro using ``while
78 * (rte_atomic32_read(&val) == 0)`` which is triggered by the main test
79 * function. Then all cores do a
80 * ``rte_atomicXX_test_and_set()`` at the same time. If it is successful,
81 * it increments another atomic counter.
83 * - The main function checks that the atomic counter was incremented
84 * twice only (one for 16-bit, one for 32-bit and one for 64-bit values).
86 * - Test "add/sub and return"
88 * - Initialize 16-bit, 32-bit and 64-bit atomic variables to zero.
90 * - Invoke ``test_atomic_addsub_return()`` on each lcore. Before doing
91 * anything else, the cores are waiting a synchro. Each lcore does
92 * this operation several times::
94 * tmp = rte_atomicXX_add_return(&a, 1);
95 * atomic_add(&count, tmp);
96 * tmp = rte_atomicXX_sub_return(&a, 1);
97 * atomic_sub(&count, tmp+1);
99 * - At the end of the test, the *count* value must be 0.
102 #define NUM_ATOMIC_TYPES 3
106 static rte_atomic16_t a16;
107 static rte_atomic32_t a32;
108 static rte_atomic64_t a64;
109 static rte_atomic32_t count;
110 static rte_atomic32_t synchro;
113 test_atomic_usual(__attribute__((unused)) void *arg)
117 while (rte_atomic32_read(&synchro) == 0)
120 for (i = 0; i < N; i++)
121 rte_atomic16_inc(&a16);
122 for (i = 0; i < N; i++)
123 rte_atomic16_dec(&a16);
124 for (i = 0; i < (N / 5); i++)
125 rte_atomic16_add(&a16, 5);
126 for (i = 0; i < (N / 5); i++)
127 rte_atomic16_sub(&a16, 5);
129 for (i = 0; i < N; i++)
130 rte_atomic32_inc(&a32);
131 for (i = 0; i < N; i++)
132 rte_atomic32_dec(&a32);
133 for (i = 0; i < (N / 5); i++)
134 rte_atomic32_add(&a32, 5);
135 for (i = 0; i < (N / 5); i++)
136 rte_atomic32_sub(&a32, 5);
138 for (i = 0; i < N; i++)
139 rte_atomic64_inc(&a64);
140 for (i = 0; i < N; i++)
141 rte_atomic64_dec(&a64);
142 for (i = 0; i < (N / 5); i++)
143 rte_atomic64_add(&a64, 5);
144 for (i = 0; i < (N / 5); i++)
145 rte_atomic64_sub(&a64, 5);
151 test_atomic_tas(__attribute__((unused)) void *arg)
153 while (rte_atomic32_read(&synchro) == 0)
156 if (rte_atomic16_test_and_set(&a16))
157 rte_atomic32_inc(&count);
158 if (rte_atomic32_test_and_set(&a32))
159 rte_atomic32_inc(&count);
160 if (rte_atomic64_test_and_set(&a64))
161 rte_atomic32_inc(&count);
167 test_atomic_addsub_and_return(__attribute__((unused)) void *arg)
174 while (rte_atomic32_read(&synchro) == 0)
177 for (i = 0; i < N; i++) {
178 tmp16 = rte_atomic16_add_return(&a16, 1);
179 rte_atomic32_add(&count, tmp16);
181 tmp16 = rte_atomic16_sub_return(&a16, 1);
182 rte_atomic32_sub(&count, tmp16+1);
184 tmp32 = rte_atomic32_add_return(&a32, 1);
185 rte_atomic32_add(&count, tmp32);
187 tmp32 = rte_atomic32_sub_return(&a32, 1);
188 rte_atomic32_sub(&count, tmp32+1);
190 tmp64 = rte_atomic64_add_return(&a64, 1);
191 rte_atomic32_add(&count, tmp64);
193 tmp64 = rte_atomic64_sub_return(&a64, 1);
194 rte_atomic32_sub(&count, tmp64+1);
201 * rte_atomic32_inc_and_test() would increase a 32 bits counter by one and then
202 * test if that counter is equal to 0. It would return true if the counter is 0
203 * and false if the counter is not 0. rte_atomic64_inc_and_test() could do the
204 * same thing but for a 64 bits counter.
205 * Here checks that if the 32/64 bits counter is equal to 0 after being atomically
206 * increased by one. If it is, increase the variable of "count" by one which would
207 * be checked as the result later.
211 test_atomic_inc_and_test(__attribute__((unused)) void *arg)
213 while (rte_atomic32_read(&synchro) == 0)
216 if (rte_atomic16_inc_and_test(&a16)) {
217 rte_atomic32_inc(&count);
219 if (rte_atomic32_inc_and_test(&a32)) {
220 rte_atomic32_inc(&count);
222 if (rte_atomic64_inc_and_test(&a64)) {
223 rte_atomic32_inc(&count);
230 * rte_atomicXX_dec_and_test() should decrease a 32 bits counter by one and then
231 * test if that counter is equal to 0. It should return true if the counter is 0
232 * and false if the counter is not 0.
233 * This test checks if the counter is equal to 0 after being atomically
234 * decreased by one. If it is, increase the value of "count" by one which is to
235 * be checked as the result later.
238 test_atomic_dec_and_test(__attribute__((unused)) void *arg)
240 while (rte_atomic32_read(&synchro) == 0)
243 if (rte_atomic16_dec_and_test(&a16))
244 rte_atomic32_inc(&count);
246 if (rte_atomic32_dec_and_test(&a32))
247 rte_atomic32_inc(&count);
249 if (rte_atomic64_dec_and_test(&a64))
250 rte_atomic32_inc(&count);
258 rte_atomic16_init(&a16);
259 rte_atomic32_init(&a32);
260 rte_atomic64_init(&a64);
261 rte_atomic32_init(&count);
262 rte_atomic32_init(&synchro);
264 rte_atomic16_set(&a16, 1UL << 10);
265 rte_atomic32_set(&a32, 1UL << 10);
266 rte_atomic64_set(&a64, 1ULL << 33);
268 printf("usual inc/dec/add/sub functions\n");
270 rte_eal_mp_remote_launch(test_atomic_usual, NULL, SKIP_MASTER);
271 rte_atomic32_set(&synchro, 1);
272 rte_eal_mp_wait_lcore();
273 rte_atomic32_set(&synchro, 0);
275 if (rte_atomic16_read(&a16) != 1UL << 10) {
276 printf("Atomic16 usual functions failed\n");
280 if (rte_atomic32_read(&a32) != 1UL << 10) {
281 printf("Atomic32 usual functions failed\n");
285 if (rte_atomic64_read(&a64) != 1ULL << 33) {
286 printf("Atomic64 usual functions failed\n");
290 printf("test and set\n");
292 rte_atomic64_set(&a64, 0);
293 rte_atomic32_set(&a32, 0);
294 rte_atomic16_set(&a16, 0);
295 rte_atomic32_set(&count, 0);
296 rte_eal_mp_remote_launch(test_atomic_tas, NULL, SKIP_MASTER);
297 rte_atomic32_set(&synchro, 1);
298 rte_eal_mp_wait_lcore();
299 rte_atomic32_set(&synchro, 0);
301 if (rte_atomic32_read(&count) != NUM_ATOMIC_TYPES) {
302 printf("Atomic test and set failed\n");
306 printf("add/sub and return\n");
308 rte_atomic64_set(&a64, 0);
309 rte_atomic32_set(&a32, 0);
310 rte_atomic16_set(&a16, 0);
311 rte_atomic32_set(&count, 0);
312 rte_eal_mp_remote_launch(test_atomic_addsub_and_return, NULL,
314 rte_atomic32_set(&synchro, 1);
315 rte_eal_mp_wait_lcore();
316 rte_atomic32_set(&synchro, 0);
318 if (rte_atomic32_read(&count) != 0) {
319 printf("Atomic add/sub+return failed\n");
324 * Set a64, a32 and a16 with the same value of minus "number of slave
325 * lcores", launch all slave lcores to atomically increase by one and
326 * test them respectively.
327 * Each lcore should have only one chance to increase a64 by one and
328 * then check if it is equal to 0, but there should be only one lcore
329 * that finds that it is 0. It is similar for a32 and a16.
330 * Then a variable of "count", initialized to zero, is increased by
331 * one if a64, a32 or a16 is 0 after being increased and tested
333 * We can check if "count" is finally equal to 3 to see if all slave
334 * lcores performed "atomic inc and test" right.
336 printf("inc and test\n");
338 rte_atomic64_clear(&a64);
339 rte_atomic32_clear(&a32);
340 rte_atomic16_clear(&a16);
341 rte_atomic32_clear(&synchro);
342 rte_atomic32_clear(&count);
344 rte_atomic64_set(&a64, (int64_t)(1 - (int64_t)rte_lcore_count()));
345 rte_atomic32_set(&a32, (int32_t)(1 - (int32_t)rte_lcore_count()));
346 rte_atomic16_set(&a16, (int16_t)(1 - (int16_t)rte_lcore_count()));
347 rte_eal_mp_remote_launch(test_atomic_inc_and_test, NULL, SKIP_MASTER);
348 rte_atomic32_set(&synchro, 1);
349 rte_eal_mp_wait_lcore();
350 rte_atomic32_clear(&synchro);
352 if (rte_atomic32_read(&count) != NUM_ATOMIC_TYPES) {
353 printf("Atomic inc and test failed %d\n", count.cnt);
358 * Same as above, but this time we set the values to "number of slave
359 * lcores", and decrement instead of increment.
361 printf("dec and test\n");
363 rte_atomic32_clear(&synchro);
364 rte_atomic32_clear(&count);
366 rte_atomic64_set(&a64, (int64_t)(rte_lcore_count() - 1));
367 rte_atomic32_set(&a32, (int32_t)(rte_lcore_count() - 1));
368 rte_atomic16_set(&a16, (int16_t)(rte_lcore_count() - 1));
369 rte_eal_mp_remote_launch(test_atomic_dec_and_test, NULL, SKIP_MASTER);
370 rte_atomic32_set(&synchro, 1);
371 rte_eal_mp_wait_lcore();
372 rte_atomic32_clear(&synchro);
374 if (rte_atomic32_read(&count) != NUM_ATOMIC_TYPES) {
375 printf("Atomic dec and test failed\n");