numam-spdk/lib/nvme/nvme_uevent.c
Cunyin Chang 1bbb43c544 nvme: Replace some strcpy with snprintf
Change-Id: If80ae64fa672ae6b847ad985be6862e5d2b3729b
Signed-off-by: Cunyin Chang <cunyin.chang@intel.com>
2017-03-23 15:26:07 -07:00

194 lines
5.1 KiB
C

/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/log.h"
#include "spdk/event.h"
#include "nvme_uevent.h"
#ifdef __linux__
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#define SPDK_UEVENT_MSG_LEN 4096
#define TRADDR_FMT "%.4" PRIx16 ":%.2" PRIx8 ":%.2" PRIx8 ".%" PRIx8
int
spdk_uevent_connect(void)
{
struct sockaddr_nl addr;
int ret;
int netlink_fd;
int size = 64 * 1024;
int nonblock = 1;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();
addr.nl_groups = 0xffffffff;
netlink_fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (netlink_fd < 0)
return -1;
setsockopt(netlink_fd, SOL_SOCKET, SO_RCVBUFFORCE, &size, sizeof(size));
ret = ioctl(netlink_fd, FIONBIO, &nonblock);
if (ret != 0) {
SPDK_ERRLOG("ioctl(FIONBIO) failed\n");
close(netlink_fd);
return -1;
}
if (bind(netlink_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
close(netlink_fd);
return -1;
}
return netlink_fd;
}
/* Note: We only parse the event from uio subsystem and will ignore
* all the event from other subsystem. the event from uio subsystem
* as below:
* action: "add" or "remove"
* subsystem: "uio"
* dev_path: "/devices/pci0000:80/0000:80:01.0/0000:81:00.0/uio/uio0"
*/
static int
parse_event(const char *buf, struct spdk_uevent *event)
{
int ret;
char action[SPDK_UEVENT_MSG_LEN];
char subsystem[SPDK_UEVENT_MSG_LEN];
char dev_path[SPDK_UEVENT_MSG_LEN];
memset(action, 0, SPDK_UEVENT_MSG_LEN);
memset(subsystem, 0, SPDK_UEVENT_MSG_LEN);
memset(dev_path, 0, SPDK_UEVENT_MSG_LEN);
while (*buf) {
if (!strncmp(buf, "ACTION=", 7)) {
buf += 7;
snprintf(action, sizeof(action), "%s", buf);
} else if (!strncmp(buf, "DEVPATH=", 8)) {
buf += 8;
snprintf(dev_path, sizeof(dev_path), "%s", buf);
} else if (!strncmp(buf, "SUBSYSTEM=", 10)) {
buf += 10;
snprintf(subsystem, sizeof(subsystem), "%s", buf);
}
while (*buf++)
;
}
if (!strncmp(subsystem, "uio", 3)) {
char *pci_address, *tmp;
unsigned int domain, bus, dev, func;
event->subsystem = SPDK_NVME_UEVENT_SUBSYSTEM_UIO;
if (!strncmp(action, "add", 3)) {
event->action = SPDK_NVME_UEVENT_ADD;
}
if (!strncmp(action, "remove", 6)) {
event->action = SPDK_NVME_UEVENT_REMOVE;
}
tmp = strstr(dev_path, "/uio/");
memset(tmp, 0, SPDK_UEVENT_MSG_LEN - (tmp - dev_path));
pci_address = strrchr(dev_path, '/');
pci_address++;
ret = sscanf(pci_address, "%x:%x:%x.%x", &domain, &bus, &dev, &func);
if (ret != 4) {
SPDK_ERRLOG("Invalid format for NVMe BDF: %s\n", pci_address);
}
snprintf(event->traddr, sizeof(event->traddr), TRADDR_FMT, domain, bus, dev, func);
return 1;
}
return -1;
}
int
spdk_get_uevent(int fd, struct spdk_uevent *uevent)
{
int ret;
char buf[SPDK_UEVENT_MSG_LEN];
memset(uevent, 0, sizeof(struct spdk_uevent));
memset(buf, 0, SPDK_UEVENT_MSG_LEN);
ret = recv(fd, buf, SPDK_UEVENT_MSG_LEN - 1, MSG_DONTWAIT);
if (ret > 0) {
return parse_event(buf, uevent);
}
if (ret < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
return 0;
} else {
SPDK_ERRLOG("Socket read error(%d): %s\n", errno, strerror(errno));
return -1;
}
}
/* connection closed */
if (ret == 0) {
return -1;
}
return 0;
}
#else /* Not Linux */
int
spdk_uevent_connect(void)
{
return -1;
}
int
spdk_get_uevent(int fd, struct spdk_uevent *uevent)
{
return -1;
}
#endif