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/* 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;
}
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