Imported Upstream version 16.07-rc1

[deb_dpdk.git] / examples / l2fwd-keepalive / ka-agent / main.c

diff --git a/examples/l2fwd-keepalive/ka-agent/main.c b/examples/l2fwd-keepalive/ka-agent/main.c
new file mode 100644 (file)
index 0000000..be1c7f4
--- /dev/null
+++ b/examples/l2fwd-keepalive/ka-agent/main.c
@@ -0,0 +1,150 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <sys/queue.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#include <rte_keepalive.h>
+
+#include <shm.h>
+
+#define MAX_TIMEOUTS 4
+#define SEM_TIMEOUT_SECS 2
+
+static struct rte_keepalive_shm *ka_shm_create(void)
+{
+       int fd = shm_open(RTE_KEEPALIVE_SHM_NAME, O_RDWR, 0666);
+       size_t size = sizeof(struct rte_keepalive_shm);
+       struct rte_keepalive_shm *shm;
+
+       if (fd < 0)
+               printf("Failed to open %s as SHM:%s\n",
+                       RTE_KEEPALIVE_SHM_NAME,
+               strerror(errno));
+       else {
+               shm = (struct rte_keepalive_shm *) mmap(
+                       0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+               close(fd);
+               if (shm == MAP_FAILED)
+                       printf("Failed to mmap SHM:%s\n", strerror(errno));
+               else
+                       return shm;
+       }
+
+       /* Reset to zero, as it was set to MAP_FAILED aka: (void *)-1 */
+       shm = 0;
+       return NULL;
+}
+
+int main(void)
+{
+       struct rte_keepalive_shm *shm = ka_shm_create();
+       struct timespec timeout = { .tv_nsec = 0 };
+       int idx_core;
+       int cnt_cores;
+       uint64_t last_seen_alive_time = 0;
+       uint64_t most_recent_alive_time;
+       int cnt_timeouts = 0;
+       int sem_errno;
+
+       if (shm == NULL) {
+               printf("Unable to access shared core state\n");
+               return 1;
+       }
+       while (1) {
+               most_recent_alive_time = 0;
+               for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES;
+                               idx_core++)
+                       if (shm->core_last_seen_times[idx_core] >
+                                       most_recent_alive_time)
+                               most_recent_alive_time =
+                                       shm->core_last_seen_times[idx_core];
+
+               timeout.tv_sec = time(NULL) + SEM_TIMEOUT_SECS;
+               if (sem_timedwait(&shm->core_died, &timeout) == -1) {
+                       /* Assume no core death signals and no change in any
+                        * last-seen times is the keepalive monitor itself
+                        * failing.
+                        */
+                       sem_errno = errno;
+                       last_seen_alive_time = most_recent_alive_time;
+                       if (sem_errno == ETIMEDOUT) {
+                               if (last_seen_alive_time ==
+                                               most_recent_alive_time &&
+                                               cnt_timeouts++ >
+                                               MAX_TIMEOUTS) {
+                                       printf("No updates. Exiting..\n");
+                                       break;
+                                       }
+                       } else
+                               printf("sem_timedwait() error (%s)\n",
+                                       strerror(sem_errno));
+                       continue;
+               }
+               cnt_timeouts = 0;
+
+               cnt_cores = 0;
+               for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES;
+                               idx_core++)
+                       if (shm->core_state[idx_core] == RTE_KA_STATE_DEAD)
+                               cnt_cores++;
+               if (cnt_cores == 0) {
+                       /* Can happen if core was restarted since Semaphore
+                        * was sent, due to agent being offline.
+                        */
+                       printf("Warning: Empty dead core report\n");
+                       continue;
+               }
+
+               printf("%i dead cores: ", cnt_cores);
+               for (idx_core = 0;
+                               idx_core < RTE_KEEPALIVE_MAXCORES;
+                               idx_core++)
+                       if (shm->core_state[idx_core] == RTE_KA_STATE_DEAD)
+                               printf("%d, ", idx_core);
+               printf("\b\b\n");
+       }
+       if (munmap(shm, sizeof(struct rte_keepalive_shm)) != 0)
+               printf("Warning: munmap() failed\n");
+       return 0;
+}