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|
/*-
* BSD LICENSE
*
* Copyright 2017 6WIND S.A.
* Copyright 2017 Mellanox.
*
* 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 6WIND S.A. 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 <string.h>
#include <errno.h>
#include <rte_debug.h>
#include <rte_devargs.h>
#include <rte_malloc.h>
#include <rte_kvargs.h>
#include "failsafe_private.h"
#define DEVARGS_MAXLEN 4096
/* Callback used when a new device is found in devargs */
typedef int (parse_cb)(struct rte_eth_dev *dev, const char *params,
uint8_t head);
uint64_t hotplug_poll = FAILSAFE_HOTPLUG_DEFAULT_TIMEOUT_MS;
int mac_from_arg = 0;
const char *pmd_failsafe_init_parameters[] = {
PMD_FAILSAFE_HOTPLUG_POLL_KVARG,
PMD_FAILSAFE_MAC_KVARG,
NULL,
};
/*
* input: text.
* output: 0: if text[0] != '(',
* 0: if there are no corresponding ')'
* n: distance to corresponding ')' otherwise
*/
static size_t
closing_paren(const char *text)
{
int nb_open = 0;
size_t i = 0;
while (text[i] != '\0') {
if (text[i] == '(')
nb_open++;
if (text[i] == ')')
nb_open--;
if (nb_open == 0)
return i;
i++;
}
return 0;
}
static int
fs_parse_device(struct sub_device *sdev, char *args)
{
struct rte_devargs *d;
int ret;
d = &sdev->devargs;
DEBUG("%s", args);
ret = rte_eal_devargs_parse(args, d);
if (ret) {
DEBUG("devargs parsing failed with code %d", ret);
return ret;
}
sdev->bus = d->bus;
sdev->state = DEV_PARSED;
return 0;
}
static void
fs_sanitize_cmdline(char *args)
{
char *nl;
nl = strrchr(args, '\n');
if (nl)
nl[0] = '\0';
}
static int
fs_execute_cmd(struct sub_device *sdev, char *cmdline)
{
FILE *fp;
/* store possible newline as well */
char output[DEVARGS_MAXLEN + 1];
size_t len;
int ret;
RTE_ASSERT(cmdline != NULL || sdev->cmdline != NULL);
if (sdev->cmdline == NULL) {
size_t i;
len = strlen(cmdline) + 1;
sdev->cmdline = calloc(1, len);
if (sdev->cmdline == NULL) {
ERROR("Command line allocation failed");
return -ENOMEM;
}
snprintf(sdev->cmdline, len, "%s", cmdline);
/* Replace all commas in the command line by spaces */
for (i = 0; i < len; i++)
if (sdev->cmdline[i] == ',')
sdev->cmdline[i] = ' ';
}
DEBUG("'%s'", sdev->cmdline);
fp = popen(sdev->cmdline, "r");
if (fp == NULL) {
ret = -errno;
ERROR("popen: %s", strerror(errno));
return ret;
}
/* We only read one line */
if (fgets(output, sizeof(output) - 1, fp) == NULL) {
DEBUG("Could not read command output");
ret = -ENODEV;
goto ret_pclose;
}
fs_sanitize_cmdline(output);
if (output[0] == '\0') {
ret = -ENODEV;
goto ret_pclose;
}
ret = fs_parse_device(sdev, output);
if (ret)
ERROR("Parsing device '%s' failed", output);
ret_pclose:
if (pclose(fp) == -1)
ERROR("pclose: %s", strerror(errno));
return ret;
}
static int
fs_parse_device_param(struct rte_eth_dev *dev, const char *param,
uint8_t head)
{
struct fs_priv *priv;
struct sub_device *sdev;
char *args = NULL;
size_t a, b;
int ret;
priv = PRIV(dev);
a = 0;
b = 0;
ret = 0;
while (param[b] != '(' &&
param[b] != '\0')
b++;
a = b;
b += closing_paren(¶m[b]);
if (a == b) {
ERROR("Dangling parenthesis");
return -EINVAL;
}
a += 1;
args = strndup(¶m[a], b - a);
if (args == NULL) {
ERROR("Not enough memory for parameter parsing");
return -ENOMEM;
}
sdev = &priv->subs[head];
if (strncmp(param, "dev", 3) == 0) {
ret = fs_parse_device(sdev, args);
if (ret)
goto free_args;
} else if (strncmp(param, "exec", 4) == 0) {
ret = fs_execute_cmd(sdev, args);
if (ret == -ENODEV) {
DEBUG("Reading device info from command line failed");
ret = 0;
}
if (ret)
goto free_args;
} else {
ERROR("Unrecognized device type: %.*s", (int)b, param);
return -EINVAL;
}
free_args:
free(args);
return ret;
}
static int
fs_parse_sub_devices(parse_cb *cb,
struct rte_eth_dev *dev, const char *params)
{
size_t a, b;
uint8_t head;
int ret;
a = 0;
head = 0;
ret = 0;
while (params[a] != '\0') {
b = a;
while (params[b] != '(' &&
params[b] != ',' &&
params[b] != '\0')
b++;
if (b == a) {
ERROR("Invalid parameter");
return -EINVAL;
}
if (params[b] == ',') {
a = b + 1;
continue;
}
if (params[b] == '(') {
size_t start = b;
b += closing_paren(¶ms[b]);
if (b == start) {
ERROR("Dangling parenthesis");
return -EINVAL;
}
ret = (*cb)(dev, ¶ms[a], head);
if (ret)
return ret;
head += 1;
b += 1;
if (params[b] == '\0')
return 0;
}
a = b + 1;
}
return 0;
}
static int
fs_remove_sub_devices_definition(char params[DEVARGS_MAXLEN])
{
char buffer[DEVARGS_MAXLEN] = {0};
size_t a, b;
int i;
a = 0;
i = 0;
while (params[a] != '\0') {
b = a;
while (params[b] != '(' &&
params[b] != ',' &&
params[b] != '\0')
b++;
if (b == a) {
ERROR("Invalid parameter");
return -EINVAL;
}
if (params[b] == ',' || params[b] == '\0') {
size_t len = b - a;
if (i > 0)
len += 1;
snprintf(&buffer[i], len + 1, "%s%s",
i ? "," : "", ¶ms[a]);
i += len;
} else if (params[b] == '(') {
size_t start = b;
b += closing_paren(¶ms[b]);
if (b == start)
return -EINVAL;
b += 1;
if (params[b] == '\0')
goto out;
}
a = b + 1;
}
out:
snprintf(params, DEVARGS_MAXLEN, "%s", buffer);
return 0;
}
static int
fs_get_u64_arg(const char *key __rte_unused,
const char *value, void *out)
{
uint64_t *u64 = out;
char *endptr = NULL;
if ((value == NULL) || (out == NULL))
return -EINVAL;
errno = 0;
*u64 = strtoull(value, &endptr, 0);
if (errno != 0)
return -errno;
if (endptr == value)
return -1;
return 0;
}
static int
fs_get_mac_addr_arg(const char *key __rte_unused,
const char *value, void *out)
{
struct ether_addr *ea = out;
int ret;
if ((value == NULL) || (out == NULL))
return -EINVAL;
ret = sscanf(value, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&ea->addr_bytes[0], &ea->addr_bytes[1],
&ea->addr_bytes[2], &ea->addr_bytes[3],
&ea->addr_bytes[4], &ea->addr_bytes[5]);
return ret != ETHER_ADDR_LEN;
}
int
failsafe_args_parse(struct rte_eth_dev *dev, const char *params)
{
struct fs_priv *priv;
char mut_params[DEVARGS_MAXLEN] = "";
struct rte_kvargs *kvlist = NULL;
unsigned int arg_count;
size_t n;
int ret;
priv = PRIV(dev);
ret = 0;
priv->subs_tx = FAILSAFE_MAX_ETHPORTS;
/* default parameters */
n = snprintf(mut_params, sizeof(mut_params), "%s", params);
if (n >= sizeof(mut_params)) {
ERROR("Parameter string too long (>=%zu)",
sizeof(mut_params));
return -ENOMEM;
}
ret = fs_parse_sub_devices(fs_parse_device_param,
dev, params);
if (ret < 0)
return ret;
ret = fs_remove_sub_devices_definition(mut_params);
if (ret < 0)
return ret;
if (strnlen(mut_params, sizeof(mut_params)) > 0) {
kvlist = rte_kvargs_parse(mut_params,
pmd_failsafe_init_parameters);
if (kvlist == NULL) {
ERROR("Error parsing parameters, usage:\n"
PMD_FAILSAFE_PARAM_STRING);
return -1;
}
/* PLUG_IN event poll timer */
arg_count = rte_kvargs_count(kvlist,
PMD_FAILSAFE_HOTPLUG_POLL_KVARG);
if (arg_count == 1) {
ret = rte_kvargs_process(kvlist,
PMD_FAILSAFE_HOTPLUG_POLL_KVARG,
&fs_get_u64_arg, &hotplug_poll);
if (ret < 0)
goto free_kvlist;
}
/* MAC addr */
arg_count = rte_kvargs_count(kvlist,
PMD_FAILSAFE_MAC_KVARG);
if (arg_count > 0) {
ret = rte_kvargs_process(kvlist,
PMD_FAILSAFE_MAC_KVARG,
&fs_get_mac_addr_arg,
&dev->data->mac_addrs[0]);
if (ret < 0)
goto free_kvlist;
mac_from_arg = 1;
}
}
PRIV(dev)->state = DEV_PARSED;
free_kvlist:
rte_kvargs_free(kvlist);
return ret;
}
void
failsafe_args_free(struct rte_eth_dev *dev)
{
struct sub_device *sdev;
uint8_t i;
FOREACH_SUBDEV(sdev, i, dev) {
rte_free(sdev->cmdline);
sdev->cmdline = NULL;
free(sdev->devargs.args);
sdev->devargs.args = NULL;
}
}
static int
fs_count_device(struct rte_eth_dev *dev, const char *param,
uint8_t head __rte_unused)
{
size_t b = 0;
while (param[b] != '(' &&
param[b] != '\0')
b++;
if (strncmp(param, "dev", b) != 0 &&
strncmp(param, "exec", b) != 0) {
ERROR("Unrecognized device type: %.*s", (int)b, param);
return -EINVAL;
}
PRIV(dev)->subs_tail += 1;
return 0;
}
int
failsafe_args_count_subdevice(struct rte_eth_dev *dev,
const char *params)
{
return fs_parse_sub_devices(fs_count_device,
dev, params);
}
static int
fs_parse_sub_device(struct sub_device *sdev)
{
struct rte_devargs *da;
char devstr[DEVARGS_MAXLEN] = "";
da = &sdev->devargs;
snprintf(devstr, sizeof(devstr), "%s,%s", da->name, da->args);
return fs_parse_device(sdev, devstr);
}
int
failsafe_args_parse_subs(struct rte_eth_dev *dev)
{
struct sub_device *sdev;
uint8_t i;
int ret = 0;
FOREACH_SUBDEV(sdev, i, dev) {
if (sdev->state >= DEV_PARSED)
continue;
if (sdev->cmdline)
ret = fs_execute_cmd(sdev, sdev->cmdline);
else
ret = fs_parse_sub_device(sdev);
if (ret == 0)
sdev->state = DEV_PARSED;
}
return 0;
}
|