3998e2a072
Replace the BSD license header with the SPDX tag for files with only an Intel copyright on them. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2016 Intel Corporation
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*/
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#include <time.h>
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#include <rte_common.h>
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#include <rte_log.h>
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#include <rte_keepalive.h>
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#include "shm.h"
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struct rte_keepalive_shm *rte_keepalive_shm_create(void)
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{
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int fd;
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int idx_core;
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struct rte_keepalive_shm *ka_shm;
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/* If any existing object is not unlinked, it makes it all too easy
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* for clients to end up with stale shared memory blocks when
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* restarted. Unlinking makes sure subsequent shm_open by clients
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* will get the new block mapped below.
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*/
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if (shm_unlink(RTE_KEEPALIVE_SHM_NAME) == -1 && errno != ENOENT)
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printf("Warning: Error unlinking stale %s (%s)\n",
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RTE_KEEPALIVE_SHM_NAME, strerror(errno));
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fd = shm_open(RTE_KEEPALIVE_SHM_NAME,
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O_CREAT | O_TRUNC | O_RDWR, 0666);
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if (fd < 0)
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RTE_LOG(INFO, EAL,
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"Failed to open %s as SHM (%s)\n",
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RTE_KEEPALIVE_SHM_NAME,
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strerror(errno));
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else if (ftruncate(fd, sizeof(struct rte_keepalive_shm)) != 0)
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RTE_LOG(INFO, EAL,
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"Failed to resize SHM (%s)\n", strerror(errno));
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else {
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ka_shm = (struct rte_keepalive_shm *) mmap(
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0, sizeof(struct rte_keepalive_shm),
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PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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if (ka_shm == MAP_FAILED)
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RTE_LOG(INFO, EAL,
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"Failed to mmap SHM (%s)\n", strerror(errno));
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else {
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memset(ka_shm, 0, sizeof(struct rte_keepalive_shm));
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/* Initialize the semaphores for IPC/SHM use */
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if (sem_init(&ka_shm->core_died, 1, 0) != 0) {
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RTE_LOG(INFO, EAL,
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"Failed to setup SHM semaphore (%s)\n",
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strerror(errno));
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munmap(ka_shm,
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sizeof(struct rte_keepalive_shm));
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return NULL;
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}
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/* Set all cores to 'not present' */
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for (idx_core = 0;
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idx_core < RTE_KEEPALIVE_MAXCORES;
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idx_core++) {
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ka_shm->core_state[idx_core] =
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RTE_KA_STATE_UNUSED;
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ka_shm->core_last_seen_times[idx_core] = 0;
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}
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return ka_shm;
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}
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}
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return NULL;
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}
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void rte_keepalive_relayed_state(struct rte_keepalive_shm *shm,
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const int id_core, const enum rte_keepalive_state core_state,
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__rte_unused uint64_t last_alive)
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{
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int count;
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shm->core_state[id_core] = core_state;
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shm->core_last_seen_times[id_core] = last_alive;
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if (core_state == RTE_KEEPALIVE_SHM_DEAD) {
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/* Since core has died, also signal ka_agent.
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*
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* Limit number of times semaphore can be incremented, in case
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* ka_agent is not active.
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*/
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if (sem_getvalue(&shm->core_died, &count) == -1) {
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RTE_LOG(INFO, EAL, "Semaphore check failed(%s)\n",
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strerror(errno));
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return;
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}
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if (count > 1)
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return;
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if (sem_post(&shm->core_died) != 0)
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RTE_LOG(INFO, EAL,
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"Failed to increment semaphore (%s)\n",
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strerror(errno));
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}
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}
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void rte_keepalive_shm_cleanup(struct rte_keepalive_shm *ka_shm)
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{
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if (shm_unlink(RTE_KEEPALIVE_SHM_NAME) == -1 && errno != ENOENT)
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printf("Warning: Error unlinking %s (%s)\n",
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RTE_KEEPALIVE_SHM_NAME, strerror(errno));
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if (ka_shm && munmap(ka_shm, sizeof(struct rte_keepalive_shm)) != 0)
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printf("Warning: munmap() failed\n");
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}
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