/* SPDX-License-Identifier: BSD-3-Clause
- * Copyright(c) 2016 Intel Corporation
+ * Copyright(c) 2016-2018 Intel Corporation
*/
-#include <stdio.h>
+#include <dirent.h>
+#include <errno.h>
#include <fcntl.h>
+#include <fnmatch.h>
+#include <inttypes.h>
+#include <libgen.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include <rte_common.h>
+#include <rte_cycles.h>
#include <rte_eal.h>
+#include <rte_errno.h>
+#include <rte_lcore.h>
+#include <rte_log.h>
+#include "eal_private.h"
#include "eal_filesystem.h"
#include "eal_internal_cfg.h"
+static int mp_fd = -1;
+static char mp_filter[PATH_MAX]; /* Filter for secondary process sockets */
+static char mp_dir_path[PATH_MAX]; /* The directory path for all mp sockets */
+static pthread_mutex_t mp_mutex_action = PTHREAD_MUTEX_INITIALIZER;
+
+struct action_entry {
+ TAILQ_ENTRY(action_entry) next;
+ char action_name[RTE_MP_MAX_NAME_LEN];
+ rte_mp_t action;
+};
+
+/** Double linked list of actions. */
+TAILQ_HEAD(action_entry_list, action_entry);
+
+static struct action_entry_list action_entry_list =
+ TAILQ_HEAD_INITIALIZER(action_entry_list);
+
+enum mp_type {
+ MP_MSG, /* Share message with peers, will not block */
+ MP_REQ, /* Request for information, Will block for a reply */
+ MP_REP, /* Response to previously-received request */
+ MP_IGN, /* Response telling requester to ignore this response */
+};
+
+struct mp_msg_internal {
+ int type;
+ struct rte_mp_msg msg;
+};
+
+struct pending_request {
+ TAILQ_ENTRY(pending_request) next;
+ int reply_received;
+ char dst[PATH_MAX];
+ struct rte_mp_msg *request;
+ struct rte_mp_msg *reply;
+ pthread_cond_t cond;
+};
+
+TAILQ_HEAD(pending_request_list, pending_request);
+
+static struct {
+ struct pending_request_list requests;
+ pthread_mutex_t lock;
+} pending_requests = {
+ .requests = TAILQ_HEAD_INITIALIZER(pending_requests.requests),
+ .lock = PTHREAD_MUTEX_INITIALIZER
+};
+
+/* forward declarations */
+static int
+mp_send(struct rte_mp_msg *msg, const char *peer, int type);
+
+
+static struct pending_request *
+find_sync_request(const char *dst, const char *act_name)
+{
+ struct pending_request *r;
+
+ TAILQ_FOREACH(r, &pending_requests.requests, next) {
+ if (!strcmp(r->dst, dst) &&
+ !strcmp(r->request->name, act_name))
+ break;
+ }
+
+ return r;
+}
+
+static void
+create_socket_path(const char *name, char *buf, int len)
+{
+ const char *prefix = eal_mp_socket_path();
+
+ if (strlen(name) > 0)
+ snprintf(buf, len, "%s_%s", prefix, name);
+ else
+ snprintf(buf, len, "%s", prefix);
+}
+
int
rte_eal_primary_proc_alive(const char *config_file_path)
{
return !!ret;
}
+
+static struct action_entry *
+find_action_entry_by_name(const char *name)
+{
+ struct action_entry *entry;
+
+ TAILQ_FOREACH(entry, &action_entry_list, next) {
+ if (strncmp(entry->action_name, name, RTE_MP_MAX_NAME_LEN) == 0)
+ break;
+ }
+
+ return entry;
+}
+
+static int
+validate_action_name(const char *name)
+{
+ if (name == NULL) {
+ RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
+ rte_errno = EINVAL;
+ return -1;
+ }
+ if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
+ RTE_LOG(ERR, EAL, "Length of action name is zero\n");
+ rte_errno = EINVAL;
+ return -1;
+ }
+ if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
+ rte_errno = E2BIG;
+ return -1;
+ }
+ return 0;
+}
+
+int __rte_experimental
+rte_mp_action_register(const char *name, rte_mp_t action)
+{
+ struct action_entry *entry;
+
+ if (validate_action_name(name))
+ return -1;
+
+ entry = malloc(sizeof(struct action_entry));
+ if (entry == NULL) {
+ rte_errno = ENOMEM;
+ return -1;
+ }
+ strcpy(entry->action_name, name);
+ entry->action = action;
+
+ pthread_mutex_lock(&mp_mutex_action);
+ if (find_action_entry_by_name(name) != NULL) {
+ pthread_mutex_unlock(&mp_mutex_action);
+ rte_errno = EEXIST;
+ free(entry);
+ return -1;
+ }
+ TAILQ_INSERT_TAIL(&action_entry_list, entry, next);
+ pthread_mutex_unlock(&mp_mutex_action);
+ return 0;
+}
+
+void __rte_experimental
+rte_mp_action_unregister(const char *name)
+{
+ struct action_entry *entry;
+
+ if (validate_action_name(name))
+ return;
+
+ pthread_mutex_lock(&mp_mutex_action);
+ entry = find_action_entry_by_name(name);
+ if (entry == NULL) {
+ pthread_mutex_unlock(&mp_mutex_action);
+ return;
+ }
+ TAILQ_REMOVE(&action_entry_list, entry, next);
+ pthread_mutex_unlock(&mp_mutex_action);
+ free(entry);
+}
+
+static int
+read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
+{
+ int msglen;
+ struct iovec iov;
+ struct msghdr msgh;
+ char control[CMSG_SPACE(sizeof(m->msg.fds))];
+ struct cmsghdr *cmsg;
+ int buflen = sizeof(*m) - sizeof(m->msg.fds);
+
+ memset(&msgh, 0, sizeof(msgh));
+ iov.iov_base = m;
+ iov.iov_len = buflen;
+
+ msgh.msg_name = s;
+ msgh.msg_namelen = sizeof(*s);
+ msgh.msg_iov = &iov;
+ msgh.msg_iovlen = 1;
+ msgh.msg_control = control;
+ msgh.msg_controllen = sizeof(control);
+
+ msglen = recvmsg(mp_fd, &msgh, 0);
+ if (msglen < 0) {
+ RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (msglen != buflen || (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
+ RTE_LOG(ERR, EAL, "truncted msg\n");
+ return -1;
+ }
+
+ /* read auxiliary FDs if any */
+ for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
+ cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
+ if ((cmsg->cmsg_level == SOL_SOCKET) &&
+ (cmsg->cmsg_type == SCM_RIGHTS)) {
+ memcpy(m->msg.fds, CMSG_DATA(cmsg), sizeof(m->msg.fds));
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void
+process_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
+{
+ struct pending_request *sync_req;
+ struct action_entry *entry;
+ struct rte_mp_msg *msg = &m->msg;
+ rte_mp_t action = NULL;
+
+ RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name);
+
+ if (m->type == MP_REP || m->type == MP_IGN) {
+ pthread_mutex_lock(&pending_requests.lock);
+ sync_req = find_sync_request(s->sun_path, msg->name);
+ if (sync_req) {
+ memcpy(sync_req->reply, msg, sizeof(*msg));
+ /* -1 indicates that we've been asked to ignore */
+ sync_req->reply_received = m->type == MP_REP ? 1 : -1;
+ pthread_cond_signal(&sync_req->cond);
+ } else
+ RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name);
+ pthread_mutex_unlock(&pending_requests.lock);
+ return;
+ }
+
+ pthread_mutex_lock(&mp_mutex_action);
+ entry = find_action_entry_by_name(msg->name);
+ if (entry != NULL)
+ action = entry->action;
+ pthread_mutex_unlock(&mp_mutex_action);
+
+ if (!action) {
+ if (m->type == MP_REQ && !internal_config.init_complete) {
+ /* if this is a request, and init is not yet complete,
+ * and callback wasn't registered, we should tell the
+ * requester to ignore our existence because we're not
+ * yet ready to process this request.
+ */
+ struct rte_mp_msg dummy;
+ memset(&dummy, 0, sizeof(dummy));
+ mp_send(&dummy, s->sun_path, MP_IGN);
+ } else {
+ RTE_LOG(ERR, EAL, "Cannot find action: %s\n",
+ msg->name);
+ }
+ } else if (action(msg, s->sun_path) < 0) {
+ RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name);
+ }
+}
+
+static void *
+mp_handle(void *arg __rte_unused)
+{
+ struct mp_msg_internal msg;
+ struct sockaddr_un sa;
+
+ while (1) {
+ if (read_msg(&msg, &sa) == 0)
+ process_msg(&msg, &sa);
+ }
+
+ return NULL;
+}
+
+static int
+open_socket_fd(void)
+{
+ char peer_name[PATH_MAX] = {0};
+ struct sockaddr_un un;
+
+ if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+ snprintf(peer_name, sizeof(peer_name),
+ "%d_%"PRIx64, getpid(), rte_rdtsc());
+
+ mp_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+ if (mp_fd < 0) {
+ RTE_LOG(ERR, EAL, "failed to create unix socket\n");
+ return -1;
+ }
+
+ memset(&un, 0, sizeof(un));
+ un.sun_family = AF_UNIX;
+
+ create_socket_path(peer_name, un.sun_path, sizeof(un.sun_path));
+
+ unlink(un.sun_path); /* May still exist since last run */
+
+ if (bind(mp_fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
+ RTE_LOG(ERR, EAL, "failed to bind %s: %s\n",
+ un.sun_path, strerror(errno));
+ close(mp_fd);
+ return -1;
+ }
+
+ RTE_LOG(INFO, EAL, "Multi-process socket %s\n", un.sun_path);
+ return mp_fd;
+}
+
+static int
+unlink_sockets(const char *filter)
+{
+ int dir_fd;
+ DIR *mp_dir;
+ struct dirent *ent;
+
+ mp_dir = opendir(mp_dir_path);
+ if (!mp_dir) {
+ RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
+ return -1;
+ }
+ dir_fd = dirfd(mp_dir);
+
+ while ((ent = readdir(mp_dir))) {
+ if (fnmatch(filter, ent->d_name, 0) == 0)
+ unlinkat(dir_fd, ent->d_name, 0);
+ }
+
+ closedir(mp_dir);
+ return 0;
+}
+
+int
+rte_mp_channel_init(void)
+{
+ char thread_name[RTE_MAX_THREAD_NAME_LEN];
+ char path[PATH_MAX];
+ int dir_fd;
+ pthread_t tid;
+
+ /* create filter path */
+ create_socket_path("*", path, sizeof(path));
+ snprintf(mp_filter, sizeof(mp_filter), "%s", basename(path));
+
+ /* path may have been modified, so recreate it */
+ create_socket_path("*", path, sizeof(path));
+ snprintf(mp_dir_path, sizeof(mp_dir_path), "%s", dirname(path));
+
+ /* lock the directory */
+ dir_fd = open(mp_dir_path, O_RDONLY);
+ if (dir_fd < 0) {
+ RTE_LOG(ERR, EAL, "failed to open %s: %s\n",
+ mp_dir_path, strerror(errno));
+ return -1;
+ }
+
+ if (flock(dir_fd, LOCK_EX)) {
+ RTE_LOG(ERR, EAL, "failed to lock %s: %s\n",
+ mp_dir_path, strerror(errno));
+ close(dir_fd);
+ return -1;
+ }
+
+ if (rte_eal_process_type() == RTE_PROC_PRIMARY &&
+ unlink_sockets(mp_filter)) {
+ RTE_LOG(ERR, EAL, "failed to unlink mp sockets\n");
+ close(dir_fd);
+ return -1;
+ }
+
+ if (open_socket_fd() < 0) {
+ close(dir_fd);
+ return -1;
+ }
+
+ if (pthread_create(&tid, NULL, mp_handle, NULL) < 0) {
+ RTE_LOG(ERR, EAL, "failed to create mp thead: %s\n",
+ strerror(errno));
+ close(mp_fd);
+ close(dir_fd);
+ mp_fd = -1;
+ return -1;
+ }
+
+ /* try best to set thread name */
+ snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN, "rte_mp_handle");
+ rte_thread_setname(tid, thread_name);
+
+ /* unlock the directory */
+ flock(dir_fd, LOCK_UN);
+ close(dir_fd);
+
+ return 0;
+}
+
+/**
+ * Return -1, as fail to send message and it's caused by the local side.
+ * Return 0, as fail to send message and it's caused by the remote side.
+ * Return 1, as succeed to send message.
+ *
+ */
+static int
+send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
+{
+ int snd;
+ struct iovec iov;
+ struct msghdr msgh;
+ struct cmsghdr *cmsg;
+ struct sockaddr_un dst;
+ struct mp_msg_internal m;
+ int fd_size = msg->num_fds * sizeof(int);
+ char control[CMSG_SPACE(fd_size)];
+
+ m.type = type;
+ memcpy(&m.msg, msg, sizeof(*msg));
+
+ memset(&dst, 0, sizeof(dst));
+ dst.sun_family = AF_UNIX;
+ snprintf(dst.sun_path, sizeof(dst.sun_path), "%s", dst_path);
+
+ memset(&msgh, 0, sizeof(msgh));
+ memset(control, 0, sizeof(control));
+
+ iov.iov_base = &m;
+ iov.iov_len = sizeof(m) - sizeof(msg->fds);
+
+ msgh.msg_name = &dst;
+ msgh.msg_namelen = sizeof(dst);
+ msgh.msg_iov = &iov;
+ msgh.msg_iovlen = 1;
+ msgh.msg_control = control;
+ msgh.msg_controllen = sizeof(control);
+
+ cmsg = CMSG_FIRSTHDR(&msgh);
+ cmsg->cmsg_len = CMSG_LEN(fd_size);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);
+
+ do {
+ snd = sendmsg(mp_fd, &msgh, 0);
+ } while (snd < 0 && errno == EINTR);
+
+ if (snd < 0) {
+ rte_errno = errno;
+ /* Check if it caused by peer process exits */
+ if (errno == ECONNREFUSED &&
+ rte_eal_process_type() == RTE_PROC_PRIMARY) {
+ unlink(dst_path);
+ return 0;
+ }
+ if (errno == ENOBUFS) {
+ RTE_LOG(ERR, EAL, "Peer cannot receive message %s\n",
+ dst_path);
+ return 0;
+ }
+ RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
+ dst_path, strerror(errno));
+ return -1;
+ }
+
+ return 1;
+}
+
+static int
+mp_send(struct rte_mp_msg *msg, const char *peer, int type)
+{
+ int dir_fd, ret = 0;
+ DIR *mp_dir;
+ struct dirent *ent;
+
+ if (!peer && (rte_eal_process_type() == RTE_PROC_SECONDARY))
+ peer = eal_mp_socket_path();
+
+ if (peer) {
+ if (send_msg(peer, msg, type) < 0)
+ return -1;
+ else
+ return 0;
+ }
+
+ /* broadcast to all secondary processes */
+ mp_dir = opendir(mp_dir_path);
+ if (!mp_dir) {
+ RTE_LOG(ERR, EAL, "Unable to open directory %s\n",
+ mp_dir_path);
+ rte_errno = errno;
+ return -1;
+ }
+
+ dir_fd = dirfd(mp_dir);
+ /* lock the directory to prevent processes spinning up while we send */
+ if (flock(dir_fd, LOCK_EX)) {
+ RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
+ mp_dir_path);
+ rte_errno = errno;
+ closedir(mp_dir);
+ return -1;
+ }
+
+ while ((ent = readdir(mp_dir))) {
+ char path[PATH_MAX];
+
+ if (fnmatch(mp_filter, ent->d_name, 0) != 0)
+ continue;
+
+ snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
+ ent->d_name);
+ if (send_msg(path, msg, type) < 0)
+ ret = -1;
+ }
+ /* unlock the dir */
+ flock(dir_fd, LOCK_UN);
+
+ /* dir_fd automatically closed on closedir */
+ closedir(mp_dir);
+ return ret;
+}
+
+static bool
+check_input(const struct rte_mp_msg *msg)
+{
+ if (msg == NULL) {
+ RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
+ rte_errno = EINVAL;
+ return false;
+ }
+
+ if (validate_action_name(msg->name))
+ return false;
+
+ if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
+ RTE_LOG(ERR, EAL, "Message data is too long\n");
+ rte_errno = E2BIG;
+ return false;
+ }
+
+ if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
+ RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
+ RTE_MP_MAX_FD_NUM);
+ rte_errno = E2BIG;
+ return false;
+ }
+
+ return true;
+}
+
+int __rte_experimental
+rte_mp_sendmsg(struct rte_mp_msg *msg)
+{
+ if (!check_input(msg))
+ return -1;
+
+ RTE_LOG(DEBUG, EAL, "sendmsg: %s\n", msg->name);
+ return mp_send(msg, NULL, MP_MSG);
+}
+
+static int
+mp_request_one(const char *dst, struct rte_mp_msg *req,
+ struct rte_mp_reply *reply, const struct timespec *ts)
+{
+ int ret;
+ struct rte_mp_msg msg, *tmp;
+ struct pending_request sync_req, *exist;
+
+ sync_req.reply_received = 0;
+ strcpy(sync_req.dst, dst);
+ sync_req.request = req;
+ sync_req.reply = &msg;
+ pthread_cond_init(&sync_req.cond, NULL);
+
+ pthread_mutex_lock(&pending_requests.lock);
+ exist = find_sync_request(dst, req->name);
+ if (!exist)
+ TAILQ_INSERT_TAIL(&pending_requests.requests, &sync_req, next);
+ if (exist) {
+ RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
+ rte_errno = EEXIST;
+ pthread_mutex_unlock(&pending_requests.lock);
+ return -1;
+ }
+
+ ret = send_msg(dst, req, MP_REQ);
+ if (ret < 0) {
+ RTE_LOG(ERR, EAL, "Fail to send request %s:%s\n",
+ dst, req->name);
+ return -1;
+ } else if (ret == 0)
+ return 0;
+
+ reply->nb_sent++;
+
+ do {
+ ret = pthread_cond_timedwait(&sync_req.cond,
+ &pending_requests.lock, ts);
+ } while (ret != 0 && ret != ETIMEDOUT);
+
+ /* We got the lock now */
+ TAILQ_REMOVE(&pending_requests.requests, &sync_req, next);
+ pthread_mutex_unlock(&pending_requests.lock);
+
+ if (sync_req.reply_received == 0) {
+ RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
+ dst, req->name);
+ rte_errno = ETIMEDOUT;
+ return -1;
+ }
+ if (sync_req.reply_received == -1) {
+ RTE_LOG(DEBUG, EAL, "Asked to ignore response\n");
+ /* not receiving this message is not an error, so decrement
+ * number of sent messages
+ */
+ reply->nb_sent--;
+ return 0;
+ }
+
+ tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1));
+ if (!tmp) {
+ RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
+ dst, req->name);
+ rte_errno = ENOMEM;
+ return -1;
+ }
+ memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
+ reply->msgs = tmp;
+ reply->nb_received++;
+ return 0;
+}
+
+int __rte_experimental
+rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
+ const struct timespec *ts)
+{
+ int dir_fd, ret = 0;
+ DIR *mp_dir;
+ struct dirent *ent;
+ struct timeval now;
+ struct timespec end;
+
+ RTE_LOG(DEBUG, EAL, "request: %s\n", req->name);
+
+ if (check_input(req) == false)
+ return -1;
+ if (gettimeofday(&now, NULL) < 0) {
+ RTE_LOG(ERR, EAL, "Faile to get current time\n");
+ rte_errno = errno;
+ return -1;
+ }
+
+ end.tv_nsec = (now.tv_usec * 1000 + ts->tv_nsec) % 1000000000;
+ end.tv_sec = now.tv_sec + ts->tv_sec +
+ (now.tv_usec * 1000 + ts->tv_nsec) / 1000000000;
+
+ reply->nb_sent = 0;
+ reply->nb_received = 0;
+ reply->msgs = NULL;
+
+ /* for secondary process, send request to the primary process only */
+ if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+ return mp_request_one(eal_mp_socket_path(), req, reply, &end);
+
+ /* for primary process, broadcast request, and collect reply 1 by 1 */
+ mp_dir = opendir(mp_dir_path);
+ if (!mp_dir) {
+ RTE_LOG(ERR, EAL, "Unable to open directory %s\n", mp_dir_path);
+ rte_errno = errno;
+ return -1;
+ }
+
+ dir_fd = dirfd(mp_dir);
+ /* lock the directory to prevent processes spinning up while we send */
+ if (flock(dir_fd, LOCK_EX)) {
+ RTE_LOG(ERR, EAL, "Unable to lock directory %s\n",
+ mp_dir_path);
+ closedir(mp_dir);
+ rte_errno = errno;
+ return -1;
+ }
+
+ while ((ent = readdir(mp_dir))) {
+ char path[PATH_MAX];
+
+ if (fnmatch(mp_filter, ent->d_name, 0) != 0)
+ continue;
+
+ snprintf(path, sizeof(path), "%s/%s", mp_dir_path,
+ ent->d_name);
+
+ if (mp_request_one(path, req, reply, &end))
+ ret = -1;
+ }
+ /* unlock the directory */
+ flock(dir_fd, LOCK_UN);
+
+ /* dir_fd automatically closed on closedir */
+ closedir(mp_dir);
+ return ret;
+}
+
+int __rte_experimental
+rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
+{
+
+ RTE_LOG(DEBUG, EAL, "reply: %s\n", msg->name);
+
+ if (check_input(msg) == false)
+ return -1;
+
+ if (peer == NULL) {
+ RTE_LOG(ERR, EAL, "peer is not specified\n");
+ rte_errno = EINVAL;
+ return -1;
+ }
+
+ return mp_send(msg, peer, MP_REP);
+}
git.droids-corp.org / dpdk.git / blobdiff