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-rw-r--r--src/lib/shm_flow_set.c407
1 files changed, 407 insertions, 0 deletions
diff --git a/src/lib/shm_flow_set.c b/src/lib/shm_flow_set.c
new file mode 100644
index 00000000..04de9fc5
--- /dev/null
+++ b/src/lib/shm_flow_set.c
@@ -0,0 +1,407 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Management of flow_sets for fqueue
+ *
+ * Dimitri Staessens <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/lockfile.h>
+#include <ouroboros/time_utils.h>
+#include <ouroboros/shm_flow_set.h>
+#include <ouroboros/fqueue.h>
+#include <ouroboros/errno.h>
+
+#define OUROBOROS_PREFIX "shm_flow_set"
+
+#include <ouroboros/logs.h>
+
+#include <pthread.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <assert.h>
+
+#define FN_MAX_CHARS 255
+
+#define FQUEUESIZE (SHM_BUFFER_SIZE * sizeof(int))
+
+#define SHM_FLOW_SET_FILE_SIZE (IRMD_MAX_FLOWS * sizeof(ssize_t) \
+ + AP_MAX_FQUEUES * sizeof(size_t) \
+ + AP_MAX_FQUEUES * sizeof(pthread_cond_t) \
+ + AP_MAX_FQUEUES * FQUEUESIZE \
+ + sizeof(pthread_mutex_t))
+
+#define fqueue_ptr(fs, idx) (fs->fqueues + SHM_BUFFER_SIZE * idx)
+
+struct shm_flow_set {
+ ssize_t * mtable;
+ size_t * heads;
+ pthread_cond_t * conds;
+ int * fqueues;
+ pthread_mutex_t * lock;
+
+ pid_t api;
+};
+
+struct shm_flow_set * shm_flow_set_create()
+{
+ struct shm_flow_set * set;
+ ssize_t * shm_base;
+ pthread_mutexattr_t mattr;
+ pthread_condattr_t cattr;
+ char fn[FN_MAX_CHARS];
+ mode_t mask;
+ int shm_fd;
+ int i;
+
+ sprintf(fn, SHM_FLOW_SET_PREFIX "%d", getpid());
+
+ set = malloc(sizeof(*set));
+ if (set == NULL) {
+ LOG_DBG("Could not allocate struct.");
+ return NULL;
+ }
+
+ mask = umask(0);
+
+ shm_fd = shm_open(fn, O_CREAT | O_EXCL | O_RDWR, 0666);
+ if (shm_fd == -1) {
+ LOG_DBG("Failed creating flag file.");
+ free(set);
+ return NULL;
+ }
+
+ umask(mask);
+
+ if (ftruncate(shm_fd, SHM_FLOW_SET_FILE_SIZE - 1) < 0) {
+ LOG_DBG("Failed to extend flag file.");
+ free(set);
+ close(shm_fd);
+ return NULL;
+ }
+
+ shm_base = mmap(NULL,
+ SHM_FLOW_SET_FILE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ shm_fd,
+ 0);
+
+ close(shm_fd);
+
+ if (shm_base == MAP_FAILED) {
+ LOG_DBG("Failed to map shared memory.");
+ if (shm_unlink(fn) == -1)
+ LOG_DBG("Failed to remove invalid shm.");
+
+ free(set);
+ return NULL;
+ }
+
+ set->mtable = shm_base;
+ set->heads = (size_t *) (set->mtable + IRMD_MAX_FLOWS);
+ set->conds = (pthread_cond_t *)(set->heads + AP_MAX_FQUEUES);
+ set->fqueues = (int *) (set->conds + AP_MAX_FQUEUES);
+ set->lock = (pthread_mutex_t *)
+ (set->fqueues + AP_MAX_FQUEUES * SHM_BUFFER_SIZE);
+
+ pthread_mutexattr_init(&mattr);
+#ifndef __APPLE__
+ pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST);
+#endif
+ pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
+ pthread_mutex_init(set->lock, &mattr);
+
+ pthread_condattr_init(&cattr);
+ pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED);
+#ifndef __APPLE__
+ pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
+#endif
+ for (i = 0; i < AP_MAX_FQUEUES; ++i) {
+ set->heads[i] = 0;
+ pthread_cond_init(&set->conds[i], &cattr);
+ }
+
+ for (i = 0; i < IRMD_MAX_FLOWS; ++i)
+ set->mtable[i] = -1;
+
+ set->api = getpid();
+
+ return set;
+}
+
+struct shm_flow_set * shm_flow_set_open(pid_t api)
+{
+ struct shm_flow_set * set;
+ ssize_t * shm_base;
+ char fn[FN_MAX_CHARS];
+ int shm_fd;
+
+ sprintf(fn, SHM_FLOW_SET_PREFIX "%d", api);
+
+ set = malloc(sizeof(*set));
+ if (set == NULL) {
+ LOG_DBG("Could not allocate struct.");
+ return NULL;
+ }
+
+ shm_fd = shm_open(fn, O_RDWR, 0666);
+ if (shm_fd == -1) {
+ LOG_DBG("%d failed opening shared memory %s.", getpid(), fn);
+ free(set);
+ return NULL;
+ }
+
+ shm_base = mmap(NULL,
+ SHM_FLOW_SET_FILE_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ shm_fd,
+ 0);
+
+ close(shm_fd);
+
+ if (shm_base == MAP_FAILED) {
+ LOG_DBG("Failed to map shared memory.");
+ if (shm_unlink(fn) == -1)
+ LOG_DBG("Failed to remove invalid shm.");
+ free(set);
+ return NULL;
+ }
+
+ set->mtable = shm_base;
+ set->heads = (size_t *) (set->mtable + IRMD_MAX_FLOWS);
+ set->conds = (pthread_cond_t *)(set->heads + AP_MAX_FQUEUES);
+ set->fqueues = (int *) (set->conds + AP_MAX_FQUEUES);
+ set->lock = (pthread_mutex_t *)
+ (set->fqueues + AP_MAX_FQUEUES * SHM_BUFFER_SIZE);
+
+ set->api = api;
+
+ return set;
+}
+
+void shm_flow_set_destroy(struct shm_flow_set * set)
+{
+ char fn[25];
+ struct lockfile * lf = NULL;
+
+ assert(set);
+
+ if (set->api != getpid()) {
+ lf = lockfile_open();
+ if (lf == NULL) {
+ LOG_ERR("Failed to open lockfile.");
+ return;
+ }
+
+ if (lockfile_owner(lf) == getpid()) {
+ LOG_DBG("Flow set %d destroyed by IRMd %d.",
+ set->api, getpid());
+ lockfile_close(lf);
+ } else {
+ LOG_ERR("AP-I %d tried to destroy flowset owned by %d.",
+ getpid(), set->api);
+ lockfile_close(lf);
+ return;
+ }
+ }
+
+ sprintf(fn, SHM_FLOW_SET_PREFIX "%d", set->api);
+
+ if (munmap(set->mtable, SHM_FLOW_SET_FILE_SIZE) == -1)
+ LOG_DBG("Couldn't unmap shared memory.");
+
+ if (shm_unlink(fn) == -1)
+ LOG_DBG("Failed to unlink shm.");
+
+ free(set);
+}
+
+void shm_flow_set_close(struct shm_flow_set * set)
+{
+ assert(set);
+
+ if (munmap(set->mtable, SHM_FLOW_SET_FILE_SIZE) == -1)
+ LOG_DBG("Couldn't unmap shared memory.");
+
+ free(set);
+}
+
+void shm_flow_set_zero(struct shm_flow_set * shm_set,
+ ssize_t idx)
+{
+ ssize_t i = 0;
+
+ assert(!(idx < 0) && idx < AP_MAX_FQUEUES);
+
+ pthread_mutex_lock(shm_set->lock);
+
+ for (i = 0; i < IRMD_MAX_FLOWS; ++i)
+ if (shm_set->mtable[i] == idx)
+ shm_set->mtable[i] = -1;
+
+ shm_set->heads[idx] = 0;
+
+ pthread_mutex_unlock(shm_set->lock);
+}
+
+
+int shm_flow_set_add(struct shm_flow_set * shm_set,
+ ssize_t idx,
+ int port_id)
+{
+ assert(shm_set);
+ assert(!(port_id < 0) && port_id < IRMD_MAX_FLOWS);
+ assert(!(idx < 0) && idx < AP_MAX_FQUEUES);
+
+ pthread_mutex_lock(shm_set->lock);
+
+ if (shm_set->mtable[port_id] != -1) {
+ pthread_mutex_unlock(shm_set->lock);
+ return -EPERM;
+ }
+
+ shm_set->mtable[port_id] = idx;
+
+ pthread_mutex_unlock(shm_set->lock);
+
+ return 0;
+}
+
+void shm_flow_set_del(struct shm_flow_set * shm_set,
+ ssize_t idx,
+ int port_id)
+{
+ assert(shm_set);
+ assert(!(port_id < 0) && port_id < IRMD_MAX_FLOWS);
+ assert(!(idx < 0) && idx < AP_MAX_FQUEUES);
+
+ pthread_mutex_lock(shm_set->lock);
+
+ if (shm_set->mtable[port_id] == idx)
+ shm_set->mtable[port_id] = -1;
+
+ pthread_mutex_unlock(shm_set->lock);
+}
+
+int shm_flow_set_has(struct shm_flow_set * shm_set,
+ ssize_t idx,
+ int port_id)
+{
+ int ret = 0;
+
+ assert(shm_set);
+ assert(!(port_id < 0) && port_id < IRMD_MAX_FLOWS);
+ assert(!(idx < 0) && idx < AP_MAX_FQUEUES);
+
+ pthread_mutex_lock(shm_set->lock);
+
+ if (shm_set->mtable[port_id] == idx)
+ ret = 1;
+
+ pthread_mutex_unlock(shm_set->lock);
+
+ return ret;
+}
+
+void shm_flow_set_notify(struct shm_flow_set * shm_set, int port_id)
+{
+ assert(shm_set);
+ assert(!(port_id < 0) && port_id < IRMD_MAX_FLOWS);
+
+ pthread_mutex_lock(shm_set->lock);
+
+ if (shm_set->mtable[port_id] == -1) {
+ pthread_mutex_unlock(shm_set->lock);
+ return;
+ }
+
+ *(fqueue_ptr(shm_set, shm_set->mtable[port_id]) +
+ (shm_set->heads[shm_set->mtable[port_id]])++) = port_id;
+
+ pthread_cond_signal(&shm_set->conds[shm_set->mtable[port_id]]);
+
+ pthread_mutex_unlock(shm_set->lock);
+}
+
+
+int shm_flow_set_wait(const struct shm_flow_set * shm_set,
+ ssize_t idx,
+ int * fqueue,
+ const struct timespec * timeout)
+{
+ int ret = 0;
+ struct timespec abstime;
+
+ assert(shm_set);
+ assert(!(idx < 0) && idx < AP_MAX_FQUEUES);
+
+#ifdef __APPLE__
+ pthread_mutex_lock(shm_set->lock);
+#else
+ if (pthread_mutex_lock(shm_set->lock) == EOWNERDEAD) {
+ LOG_DBG("Recovering dead mutex.");
+ pthread_mutex_consistent(shm_set->lock);
+ }
+#endif
+ if (timeout != NULL) {
+ clock_gettime(PTHREAD_COND_CLOCK, &abstime);
+ ts_add(&abstime, timeout, &abstime);
+ }
+
+ pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
+ (void *) shm_set->lock);
+
+ while (shm_set->heads[idx] == 0 && ret != -ETIMEDOUT) {
+ if (timeout != NULL)
+ ret = pthread_cond_timedwait(shm_set->conds + idx,
+ shm_set->lock,
+ &abstime);
+ else
+ ret = pthread_cond_wait(shm_set->conds + idx,
+ shm_set->lock);
+#ifndef __APPLE__
+ if (ret == EOWNERDEAD) {
+ LOG_DBG("Recovering dead mutex.");
+ pthread_mutex_consistent(shm_set->lock);
+ }
+#endif
+ if (ret == ETIMEDOUT) {
+ ret = -ETIMEDOUT;
+ break;
+ }
+ }
+
+ if (ret != -ETIMEDOUT) {
+ memcpy(fqueue,
+ fqueue_ptr(shm_set, idx),
+ shm_set->heads[idx] * sizeof(int));
+ ret = shm_set->heads[idx];
+ shm_set->heads[idx] = 0;
+ }
+
+ pthread_cleanup_pop(true);
+
+ return ret;
+}
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