--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#include <rte_string_fns.h>
+#include <rte_log.h>
+#include <rte_compat.h>
+#include <rte_dev.h>
+#include <rte_malloc.h>
+#include <rte_interrupts.h>
+#include <rte_alarm.h>
+
+#include "eal_private.h"
+
+static struct rte_intr_handle intr_handle = {.fd = -1 };
+static bool monitor_started;
+
+#define EAL_UEV_MSG_LEN 4096
+#define EAL_UEV_MSG_ELEM_LEN 128
+
+static void dev_uev_handler(__rte_unused void *param);
+
+/* identify the system layer which reports this event. */
+enum eal_dev_event_subsystem {
+ EAL_DEV_EVENT_SUBSYSTEM_PCI, /* PCI bus device event */
+ EAL_DEV_EVENT_SUBSYSTEM_UIO, /* UIO driver device event */
+ EAL_DEV_EVENT_SUBSYSTEM_VFIO, /* VFIO driver device event */
+ EAL_DEV_EVENT_SUBSYSTEM_MAX
+};
+
+static int
+dev_uev_socket_fd_create(void)
+{
+ struct sockaddr_nl addr;
+ int ret;
+
+ intr_handle.fd = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC |
+ SOCK_NONBLOCK,
+ NETLINK_KOBJECT_UEVENT);
+ if (intr_handle.fd < 0) {
+ RTE_LOG(ERR, EAL, "create uevent fd failed.\n");
+ return -1;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+ addr.nl_pid = 0;
+ addr.nl_groups = 0xffffffff;
+
+ ret = bind(intr_handle.fd, (struct sockaddr *) &addr, sizeof(addr));
+ if (ret < 0) {
+ RTE_LOG(ERR, EAL, "Failed to bind uevent socket.\n");
+ goto err;
+ }
+
+ return 0;
+err:
+ close(intr_handle.fd);
+ intr_handle.fd = -1;
+ return ret;
+}
+
+static int
+dev_uev_parse(const char *buf, struct rte_dev_event *event, int length)
+{
+ char action[EAL_UEV_MSG_ELEM_LEN];
+ char subsystem[EAL_UEV_MSG_ELEM_LEN];
+ char pci_slot_name[EAL_UEV_MSG_ELEM_LEN];
+ int i = 0;
+
+ memset(action, 0, EAL_UEV_MSG_ELEM_LEN);
+ memset(subsystem, 0, EAL_UEV_MSG_ELEM_LEN);
+ memset(pci_slot_name, 0, EAL_UEV_MSG_ELEM_LEN);
+
+ while (i < length) {
+ for (; i < length; i++) {
+ if (*buf)
+ break;
+ buf++;
+ }
+ /**
+ * check device uevent from kernel side, no need to check
+ * uevent from udev.
+ */
+ if (!strncmp(buf, "libudev", 7)) {
+ buf += 7;
+ i += 7;
+ return -1;
+ }
+ if (!strncmp(buf, "ACTION=", 7)) {
+ buf += 7;
+ i += 7;
+ strlcpy(action, buf, sizeof(action));
+ } else if (!strncmp(buf, "SUBSYSTEM=", 10)) {
+ buf += 10;
+ i += 10;
+ strlcpy(subsystem, buf, sizeof(subsystem));
+ } else if (!strncmp(buf, "PCI_SLOT_NAME=", 14)) {
+ buf += 14;
+ i += 14;
+ strlcpy(pci_slot_name, buf, sizeof(subsystem));
+ event->devname = strdup(pci_slot_name);
+ }
+ for (; i < length; i++) {
+ if (*buf == '\0')
+ break;
+ buf++;
+ }
+ }
+
+ /* parse the subsystem layer */
+ if (!strncmp(subsystem, "uio", 3))
+ event->subsystem = EAL_DEV_EVENT_SUBSYSTEM_UIO;
+ else if (!strncmp(subsystem, "pci", 3))
+ event->subsystem = EAL_DEV_EVENT_SUBSYSTEM_PCI;
+ else if (!strncmp(subsystem, "vfio", 4))
+ event->subsystem = EAL_DEV_EVENT_SUBSYSTEM_VFIO;
+ else
+ return -1;
+
+ /* parse the action type */
+ if (!strncmp(action, "add", 3))
+ event->type = RTE_DEV_EVENT_ADD;
+ else if (!strncmp(action, "remove", 6))
+ event->type = RTE_DEV_EVENT_REMOVE;
+ else
+ return -1;
+ return 0;
+}
+
+static void
+dev_delayed_unregister(void *param)
+{
+ rte_intr_callback_unregister(&intr_handle, dev_uev_handler, param);
+ close(intr_handle.fd);
+ intr_handle.fd = -1;
+}
+
+static void
+dev_uev_handler(__rte_unused void *param)
+{
+ struct rte_dev_event uevent;
+ int ret;
+ char buf[EAL_UEV_MSG_LEN];
+
+ memset(&uevent, 0, sizeof(struct rte_dev_event));
+ memset(buf, 0, EAL_UEV_MSG_LEN);
+
+ ret = recv(intr_handle.fd, buf, EAL_UEV_MSG_LEN, MSG_DONTWAIT);
+ if (ret < 0 && errno == EAGAIN)
+ return;
+ else if (ret <= 0) {
+ /* connection is closed or broken, can not up again. */
+ RTE_LOG(ERR, EAL, "uevent socket connection is broken.\n");
+ rte_eal_alarm_set(1, dev_delayed_unregister, NULL);
+ return;
+ }
+
+ ret = dev_uev_parse(buf, &uevent, EAL_UEV_MSG_LEN);
+ if (ret < 0) {
+ RTE_LOG(DEBUG, EAL, "It is not an valid event "
+ "that need to be handle.\n");
+ return;
+ }
+
+ RTE_LOG(DEBUG, EAL, "receive uevent(name:%s, type:%d, subsystem:%d)\n",
+ uevent.devname, uevent.type, uevent.subsystem);
+
+ if (uevent.devname)
+ dev_callback_process(uevent.devname, uevent.type);
+}
+
+int __rte_experimental
+rte_dev_event_monitor_start(void)
+{
+ int ret;
+
+ if (monitor_started)
+ return 0;
+
+ ret = dev_uev_socket_fd_create();
+ if (ret) {
+ RTE_LOG(ERR, EAL, "error create device event fd.\n");
+ return -1;
+ }
+
+ intr_handle.type = RTE_INTR_HANDLE_DEV_EVENT;
+ ret = rte_intr_callback_register(&intr_handle, dev_uev_handler, NULL);
+
+ if (ret) {
+ RTE_LOG(ERR, EAL, "fail to register uevent callback.\n");
+ return -1;
+ }
+
+ monitor_started = true;
+
+ return 0;
+}
+
+int __rte_experimental
+rte_dev_event_monitor_stop(void)
+{
+ int ret;
+
+ if (!monitor_started)
+ return 0;
+
+ ret = rte_intr_callback_unregister(&intr_handle, dev_uev_handler,
+ (void *)-1);
+ if (ret < 0) {
+ RTE_LOG(ERR, EAL, "fail to unregister uevent callback.\n");
+ return ret;
+ }
+
+ close(intr_handle.fd);
+ intr_handle.fd = -1;
+ monitor_started = false;
+ return 0;
+}
Code Review / deb_dpdk.git / blobdiff