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Diffstat (limited to 'examples/l2fwd-keepalive/shm.c')
| -rw-r--r-- | examples/l2fwd-keepalive/shm.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/examples/l2fwd-keepalive/shm.c b/examples/l2fwd-keepalive/shm.c new file mode 100644 index 00000000..177aa5b8 --- /dev/null +++ b/examples/l2fwd-keepalive/shm.c @@ -0,0 +1,131 @@ +/*- + * 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 <time.h> + +#include <rte_common.h> +#include <rte_log.h> +#include <rte_keepalive.h> + +#include "shm.h" + +struct rte_keepalive_shm *rte_keepalive_shm_create(void) +{ + int fd; + int idx_core; + struct rte_keepalive_shm *ka_shm; + + /* If any existing object is not unlinked, it makes it all too easy + * for clients to end up with stale shared memory blocks when + * restarted. Unlinking makes sure subsequent shm_open by clients + * will get the new block mapped below. + */ + if (shm_unlink(RTE_KEEPALIVE_SHM_NAME) == -1 && errno != ENOENT) + printf("Warning: Error unlinking stale %s (%s)\n", + RTE_KEEPALIVE_SHM_NAME, strerror(errno)); + + fd = shm_open(RTE_KEEPALIVE_SHM_NAME, + O_CREAT | O_TRUNC | O_RDWR, 0666); + if (fd < 0) + RTE_LOG(INFO, EAL, + "Failed to open %s as SHM (%s)\n", + RTE_KEEPALIVE_SHM_NAME, + strerror(errno)); + else if (ftruncate(fd, sizeof(struct rte_keepalive_shm)) != 0) + RTE_LOG(INFO, EAL, + "Failed to resize SHM (%s)\n", strerror(errno)); + else { + ka_shm = (struct rte_keepalive_shm *) mmap( + 0, sizeof(struct rte_keepalive_shm), + PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + close(fd); + if (ka_shm == MAP_FAILED) + RTE_LOG(INFO, EAL, + "Failed to mmap SHM (%s)\n", strerror(errno)); + else { + memset(ka_shm, 0, sizeof(struct rte_keepalive_shm)); + + /* Initialize the semaphores for IPC/SHM use */ + if (sem_init(&ka_shm->core_died, 1, 0) != 0) { + RTE_LOG(INFO, EAL, + "Failed to setup SHM semaphore (%s)\n", + strerror(errno)); + munmap(ka_shm, + sizeof(struct rte_keepalive_shm)); + return NULL; + } + + /* Set all cores to 'not present' */ + for (idx_core = 0; + idx_core < RTE_KEEPALIVE_MAXCORES; + idx_core++) { + ka_shm->core_state[idx_core] = + RTE_KA_STATE_UNUSED; + ka_shm->core_last_seen_times[idx_core] = 0; + } + + return ka_shm; + } + } +return NULL; +} + +void rte_keepalive_relayed_state(struct rte_keepalive_shm *shm, + const int id_core, const enum rte_keepalive_state core_state, + __rte_unused uint64_t last_alive) +{ + int count; + + shm->core_state[id_core] = core_state; + shm->core_last_seen_times[id_core] = last_alive; + + if (core_state == RTE_KEEPALIVE_SHM_DEAD) { + /* Since core has died, also signal ka_agent. + * + * Limit number of times semaphore can be incremented, in case + * ka_agent is not active. + */ + if (sem_getvalue(&shm->core_died, &count) == -1) { + RTE_LOG(INFO, EAL, "Semaphore check failed(%s)\n", + strerror(errno)); + return; + } + if (count > 1) + return; + + if (sem_post(&shm->core_died) != 0) + RTE_LOG(INFO, EAL, + "Failed to increment semaphore (%s)\n", + strerror(errno)); + } +} |