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|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* u_ether_configfs.h
*
* Utility definitions for configfs support in USB Ethernet functions
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef __U_ETHER_CONFIGFS_H
#define __U_ETHER_CONFIGFS_H
#include <linux/cleanup.h>
#include <linux/if_ether.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#define USB_ETHERNET_CONFIGFS_ITEM(_f_) \
static void _f_##_attr_release(struct config_item *item) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
usb_put_function_instance(&opts->func_inst); \
} \
\
static struct configfs_item_operations _f_##_item_ops = { \
.release = _f_##_attr_release, \
}
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(_f_) \
static ssize_t _f_##_opts_dev_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = gether_get_dev_addr(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t _f_##_opts_dev_addr_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
mutex_unlock(&opts->lock); \
return -EBUSY; \
} \
\
ret = gether_set_dev_addr(opts->net, page); \
mutex_unlock(&opts->lock); \
if (!ret) \
ret = len; \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, dev_addr)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(_f_) \
static ssize_t _f_##_opts_host_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int result; \
\
mutex_lock(&opts->lock); \
result = gether_get_host_addr(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return result; \
} \
\
static ssize_t _f_##_opts_host_addr_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
mutex_unlock(&opts->lock); \
return -EBUSY; \
} \
\
ret = gether_set_host_addr(opts->net, page); \
mutex_unlock(&opts->lock); \
if (!ret) \
ret = len; \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, host_addr)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(_f_) \
static ssize_t _f_##_opts_qmult_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
unsigned qmult; \
\
mutex_lock(&opts->lock); \
qmult = gether_get_qmult(opts->net); \
mutex_unlock(&opts->lock); \
return sprintf(page, "%d\n", qmult); \
} \
\
static ssize_t _f_##_opts_qmult_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
u8 val; \
int ret; \
\
mutex_lock(&opts->lock); \
if (opts->refcnt) { \
ret = -EBUSY; \
goto out; \
} \
\
ret = kstrtou8(page, 0, &val); \
if (ret) \
goto out; \
\
gether_set_qmult(opts->net, val); \
ret = len; \
out: \
mutex_unlock(&opts->lock); \
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, qmult)
#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(_f_) \
static ssize_t _f_##_opts_ifname_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
ret = gether_get_ifname(opts->net, page, PAGE_SIZE); \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
static ssize_t _f_##_opts_ifname_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret = -EBUSY; \
\
mutex_lock(&opts->lock); \
if (!opts->refcnt) \
ret = gether_set_ifname(opts->net, page, len); \
mutex_unlock(&opts->lock); \
return ret ?: len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, ifname)
#define USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(_f_, _n_) \
static ssize_t _f_##_opts_##_n_##_show(struct config_item *item,\
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret; \
\
mutex_lock(&opts->lock); \
ret = sprintf(page, "%02x\n", opts->_n_); \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
static ssize_t _f_##_opts_##_n_##_store(struct config_item *item,\
const char *page, \
size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
int ret = -EINVAL; \
u8 val; \
\
mutex_lock(&opts->lock); \
if (sscanf(page, "%02hhx", &val) > 0) { \
opts->_n_ = val; \
ret = len; \
} \
mutex_unlock(&opts->lock); \
\
return ret; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, _n_)
#define USB_ETHER_OPTS_ITEM(_f_) \
static void _f_##_attr_release(struct config_item *item) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
usb_put_function_instance(&opts->func_inst); \
} \
\
static struct configfs_item_operations _f_##_item_ops = { \
.release = _f_##_attr_release, \
}
#define USB_ETHER_OPTS_ATTR_DEV_ADDR(_f_) \
static ssize_t _f_##_opts_dev_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
guard(mutex)(&opts->lock); \
return sysfs_emit(page, "%pM\n", opts->net_opts.dev_mac); \
} \
\
static ssize_t _f_##_opts_dev_addr_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
u8 new_addr[ETH_ALEN]; \
const char *p = page; \
\
guard(mutex)(&opts->lock); \
if (opts->refcnt) \
return -EBUSY; \
\
for (int i = 0; i < ETH_ALEN; i++) { \
unsigned char num; \
if ((*p == '.') || (*p == ':')) \
p++; \
num = hex_to_bin(*p++) << 4; \
num |= hex_to_bin(*p++); \
new_addr[i] = num; \
} \
if (!is_valid_ether_addr(new_addr)) \
return -EINVAL; \
memcpy(opts->net_opts.dev_mac, new_addr, ETH_ALEN); \
opts->net_opts.addr_assign_type = NET_ADDR_SET; \
return len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, dev_addr)
#define USB_ETHER_OPTS_ATTR_HOST_ADDR(_f_) \
static ssize_t _f_##_opts_host_addr_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
guard(mutex)(&opts->lock); \
return sysfs_emit(page, "%pM\n", opts->net_opts.host_mac); \
} \
\
static ssize_t _f_##_opts_host_addr_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
u8 new_addr[ETH_ALEN]; \
const char *p = page; \
\
guard(mutex)(&opts->lock); \
if (opts->refcnt) \
return -EBUSY; \
\
for (int i = 0; i < ETH_ALEN; i++) { \
unsigned char num; \
if ((*p == '.') || (*p == ':')) \
p++; \
num = hex_to_bin(*p++) << 4; \
num |= hex_to_bin(*p++); \
new_addr[i] = num; \
} \
if (!is_valid_ether_addr(new_addr)) \
return -EINVAL; \
memcpy(opts->net_opts.host_mac, new_addr, ETH_ALEN); \
return len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, host_addr)
#define USB_ETHER_OPTS_ATTR_QMULT(_f_) \
static ssize_t _f_##_opts_qmult_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
\
guard(mutex)(&opts->lock); \
return sysfs_emit(page, "%u\n", opts->net_opts.qmult); \
} \
\
static ssize_t _f_##_opts_qmult_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
u32 val; \
int ret; \
\
guard(mutex)(&opts->lock); \
if (opts->refcnt) \
return -EBUSY; \
\
ret = kstrtou32(page, 0, &val); \
if (ret) \
return ret; \
\
opts->net_opts.qmult = val; \
return len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, qmult)
#define USB_ETHER_OPTS_ATTR_IFNAME(_f_) \
static ssize_t _f_##_opts_ifname_show(struct config_item *item, \
char *page) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
const char *name; \
\
guard(mutex)(&opts->lock); \
rtnl_lock(); \
if (opts->net_opts.ifname_set) \
name = opts->net_opts.name; \
else if (opts->net) \
name = netdev_name(opts->net); \
else \
name = "(inactive net_device)"; \
rtnl_unlock(); \
return sysfs_emit(page, "%s\n", name); \
} \
\
static ssize_t _f_##_opts_ifname_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item); \
char tmp[IFNAMSIZ]; \
const char *p; \
size_t c_len = len; \
\
if (c_len > 0 && page[c_len - 1] == '\n') \
c_len--; \
\
if (c_len >= sizeof(tmp)) \
return -E2BIG; \
\
strscpy(tmp, page, c_len + 1); \
if (!dev_valid_name(tmp)) \
return -EINVAL; \
\
/* Require exactly one %d */ \
p = strchr(tmp, '%'); \
if (!p || p[1] != 'd' || strchr(p + 2, '%')) \
return -EINVAL; \
\
guard(mutex)(&opts->lock); \
if (opts->refcnt) \
return -EBUSY; \
strscpy(opts->net_opts.name, tmp, sizeof(opts->net_opts.name)); \
opts->net_opts.ifname_set = true; \
return len; \
} \
\
CONFIGFS_ATTR(_f_##_opts_, ifname)
#endif /* __U_ETHER_CONFIGFS_H */
|
