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usr.sbin/iovctl/iovctl.c

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/*-
* Copyright (c) 2013-2015 Sandvine Inc. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: head/usr.sbin/iovctl/iovctl.c 285063 2015-07-02 21:58:10Z oshogbo $");
#include <sys/param.h>
#include <sys/iov.h>
#include <sys/dnv.h>
#include <sys/nv.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "iovctl.h"
static void config_action(const char *filename, int dryrun);
static void delete_action(const char *device, int dryrun);
static void print_schema(const char *device);
/*
* Fetch the config schema from the kernel via ioctl. This function has to
* call the ioctl twice: the first returns the amount of memory that we need
* to allocate for the schema, and the second actually fetches the schema.
*/
static nvlist_t *
get_schema(int fd)
{
struct pci_iov_schema arg;
nvlist_t *schema;
int error;
/* Do the ioctl() once to fetch the size of the schema. */
arg.schema = NULL;
arg.len = 0;
arg.error = 0;
error = ioctl(fd, IOV_GET_SCHEMA, &arg);
if (error != 0)
err(1, "Could not fetch size of config schema");
arg.schema = malloc(arg.len);
if (arg.schema == NULL)
err(1, "Could not allocate %zu bytes for schema",
arg.len);
/* Now do the ioctl() for real to get the schema. */
error = ioctl(fd, IOV_GET_SCHEMA, &arg);
if (error != 0 || arg.error != 0) {
if (arg.error != 0)
errno = arg.error;
err(1, "Could not fetch config schema");
}
schema = nvlist_unpack(arg.schema, arg.len, NV_FLAG_IGNORE_CASE);
if (schema == NULL)
err(1, "Could not unpack schema");
free(arg.schema);
return (schema);
}
/*
* Call the ioctl that activates SR-IOV and creates the VFs.
*/
static void
config_iov(int fd, const char *dev_name, const nvlist_t *config, int dryrun)
{
struct pci_iov_arg arg;
int error;
arg.config = nvlist_pack(config, &arg.len);
if (arg.config == NULL)
err(1, "Could not pack configuration");
if (dryrun) {
printf("Would enable SR-IOV on device '%s'.\n", dev_name);
printf(
"The following configuration parameters would be used:\n");
nvlist_fdump(config, stdout);
printf(
"The configuration parameters consume %zu bytes when packed.\n",
arg.len);
} else {
error = ioctl(fd, IOV_CONFIG, &arg);
if (error != 0)
err(1, "Failed to configure SR-IOV");
}
free(arg.config);
}
static int
open_device(const char *dev_name)
{
char *dev;
int fd;
size_t copied, size;
long path_max;
path_max = pathconf("/dev", _PC_PATH_MAX);
if (path_max < 0)
err(1, "Could not get maximum path length");
size = path_max;
dev = malloc(size);
if (dev == NULL)
err(1, "Could not allocate memory for device path");
if (dev_name[0] == '/')
copied = strlcpy(dev, dev_name, size);
else
copied = snprintf(dev, size, "/dev/iov/%s", dev_name);
/* >= to account for null terminator. */
if (copied >= size)
errx(1, "Provided file name too long");
fd = open(dev, O_RDWR);
if (fd < 0)
err(1, "Could not open device '%s'", dev);
free(dev);
return (fd);
}
static void
usage(void)
{
warnx("Usage: iovctl -C -f <config file> [-n]");
warnx(" iovctl -D [-d <PF device> | -f <config file>] [-n]");
warnx(" iovctl -S [-d <PF device> | -f <config file>]");
exit(1);
}
enum main_action {
NONE,
CONFIG,
DELETE,
PRINT_SCHEMA,
};
int
main(int argc, char **argv)
{
char *device;
const char *filename;
int ch, dryrun;
enum main_action action;
device = NULL;
filename = NULL;
dryrun = 0;
action = NONE;
while ((ch = getopt(argc, argv, "Cd:Df:nS")) != -1) {
switch (ch) {
case 'C':
if (action != NONE) {
warnx(
"Only one of -C, -D or -S may be specified");
usage();
}
action = CONFIG;
break;
case 'd':
device = strdup(optarg);
break;
case 'D':
if (action != NONE) {
warnx(
"Only one of -C, -D or -S may be specified");
usage();
}
action = DELETE;
break;
case 'f':
filename = optarg;
break;
case 'n':
dryrun = 1;
break;
case 'S':
if (action != NONE) {
warnx(
"Only one of -C, -D or -S may be specified");
usage();
}
action = PRINT_SCHEMA;
break;
case '?':
warnx("Unrecognized argument '-%c'\n", optopt);
usage();
break;
}
}
if (device != NULL && filename != NULL) {
warnx("Only one of the -d and -f flags may be specified");
usage();
}
if (device == NULL && filename == NULL) {
warnx("Either the -d or -f flag must be specified");
usage();
}
switch (action) {
case CONFIG:
if (filename == NULL) {
warnx("-d flag cannot be used with the -C flag");
usage();
}
config_action(filename, dryrun);
break;
case DELETE:
if (device == NULL)
device = find_device(filename);
delete_action(device, dryrun);
free(device);
break;
case PRINT_SCHEMA:
if (dryrun) {
warnx("-n flag cannot be used with the -S flag");
usage();
}
if (device == NULL)
device = find_device(filename);
print_schema(device);
free(device);
break;
default:
usage();
break;
}
exit(0);
}
static void
config_action(const char *filename, int dryrun)
{
char *dev;
nvlist_t *schema, *config;
int fd;
dev = find_device(filename);
fd = open(dev, O_RDWR);
if (fd < 0)
err(1, "Could not open device '%s'", dev);
schema = get_schema(fd);
config = parse_config_file(filename, schema);
if (config == NULL)
errx(1, "Could not parse config");
config_iov(fd, dev, config, dryrun);
nvlist_destroy(config);
nvlist_destroy(schema);
free(dev);
close(fd);
}
static void
delete_action(const char *dev_name, int dryrun)
{
int fd, error;
fd = open_device(dev_name);
if (dryrun)
printf("Would attempt to delete all VF children of '%s'\n",
dev_name);
else {
error = ioctl(fd, IOV_DELETE);
if (error != 0)
err(1, "Failed to delete VFs");
}
close(fd);
}
static void
print_default_value(const nvlist_t *parameter, const char *type)
{
const uint8_t *mac;
size_t size;
if (strcasecmp(type, "bool") == 0)
printf(" (default = %s)",
nvlist_get_bool(parameter, DEFAULT_SCHEMA_NAME) ? "true" :
"false");
else if (strcasecmp(type, "string") == 0)
printf(" (default = %s)",
nvlist_get_string(parameter, DEFAULT_SCHEMA_NAME));
else if (strcasecmp(type, "uint8_t") == 0)
printf(" (default = %ju)",
(uintmax_t)nvlist_get_number(parameter,
DEFAULT_SCHEMA_NAME));
else if (strcasecmp(type, "uint16_t") == 0)
printf(" (default = %ju)",
(uintmax_t)nvlist_get_number(parameter,
DEFAULT_SCHEMA_NAME));
else if (strcasecmp(type, "uint32_t") == 0)
printf(" (default = %ju)",
(uintmax_t)nvlist_get_number(parameter,
DEFAULT_SCHEMA_NAME));
else if (strcasecmp(type, "uint64_t") == 0)
printf(" (default = %ju)",
(uintmax_t)nvlist_get_number(parameter,
DEFAULT_SCHEMA_NAME));
else if (strcasecmp(type, "unicast-mac") == 0) {
mac = nvlist_get_binary(parameter, DEFAULT_SCHEMA_NAME, &size);
printf(" (default = %02x:%02x:%02x:%02x:%02x:%02x)", mac[0],
mac[1], mac[2], mac[3], mac[4], mac[5]);
} else
errx(1, "Unexpected type in schema: '%s'", type);
}
static void
print_subsystem_schema(const nvlist_t * subsystem_schema)
{
const char *name, *type;
const nvlist_t *parameter;
void *it;
int nvtype;
it = NULL;
while ((name = nvlist_next(subsystem_schema, &nvtype, &it)) != NULL) {
parameter = nvlist_get_nvlist(subsystem_schema, name);
type = nvlist_get_string(parameter, TYPE_SCHEMA_NAME);
printf("\t%s : %s", name, type);
if (dnvlist_get_bool(parameter, REQUIRED_SCHEMA_NAME, false))
printf(" (required)");
else if (nvlist_exists(parameter, DEFAULT_SCHEMA_NAME))
print_default_value(parameter, type);
else
printf(" (optional)");
printf("\n");
}
}
static void
print_schema(const char *dev_name)
{
nvlist_t *schema;
const nvlist_t *iov_schema, *driver_schema, *pf_schema, *vf_schema;
int fd;
fd = open_device(dev_name);
schema = get_schema(fd);
pf_schema = nvlist_get_nvlist(schema, PF_CONFIG_NAME);
iov_schema = nvlist_get_nvlist(pf_schema, IOV_CONFIG_NAME);
driver_schema = nvlist_get_nvlist(pf_schema, DRIVER_CONFIG_NAME);
printf(
"The following configuration parameters may be configured on the PF:\n");
print_subsystem_schema(iov_schema);
print_subsystem_schema(driver_schema);
vf_schema = nvlist_get_nvlist(schema, VF_SCHEMA_NAME);
iov_schema = nvlist_get_nvlist(vf_schema, IOV_CONFIG_NAME);
driver_schema = nvlist_get_nvlist(vf_schema, DRIVER_CONFIG_NAME);
printf(
"\nThe following configuration parameters may be configured on a VF:\n");
print_subsystem_schema(iov_schema);
print_subsystem_schema(driver_schema);
nvlist_destroy(schema);
close(fd);
}