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// SPDX-License-Identifier: GPL-2.0+
/*
* u_ether.h -- interface to USB gadget "ethernet link" utilities
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
* Copyright (C) 2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __U_ETHER_H
#define __U_ETHER_H
#include <linux/err.h>
#include <linux/if_ether.h>
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
#include <linux/netdevice.h>
#define QMULT_DEFAULT 5
/*
* dev_addr: initial value
* changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx"
* host_addr: this address is invisible to ifconfig
*/
#define USB_ETHERNET_MODULE_PARAMETERS() \
static unsigned qmult = QMULT_DEFAULT; \
module_param(qmult, uint, S_IRUGO|S_IWUSR); \
MODULE_PARM_DESC(qmult, "queue length multiplier at high/super speed");\
\
static char *dev_addr; \
module_param(dev_addr, charp, S_IRUGO); \
MODULE_PARM_DESC(dev_addr, "Device Ethernet Address"); \
\
static char *host_addr; \
module_param(host_addr, charp, S_IRUGO); \
MODULE_PARM_DESC(host_addr, "Host Ethernet Address")
struct eth_dev;
/*
* This represents the USB side of an "ethernet" link, managed by a USB
* function which provides control and (maybe) framing. Two functions
* in different configurations could share the same ethernet link/netdev,
* using different host interaction models.
*
* There is a current limitation that only one instance of this link may
* be present in any given configuration. When that's a problem, network
* layer facilities can be used to package multiple logical links on this
* single "physical" one.
*/
struct gether {
struct usb_function func;
/* updated by gether_{connect,disconnect} */
struct eth_dev *ioport;
/* endpoints handle full and/or high speeds */
struct usb_ep *in_ep;
struct usb_ep *out_ep;
bool is_zlp_ok;
u16 cdc_filter;
/* hooks for added framing, as needed for RNDIS and EEM. */
u32 header_len;
/* NCM requires fixed size bundles */
bool is_fixed;
u32 fixed_out_len;
u32 fixed_in_len;
bool supports_multi_frame;
struct sk_buff *(*wrap)(struct gether *port,
struct sk_buff *skb);
int (*unwrap)(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list);
/* called on network open/close */
void (*open)(struct gether *);
void (*close)(struct gether *);
};
#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
|USB_CDC_PACKET_TYPE_PROMISCUOUS \
|USB_CDC_PACKET_TYPE_DIRECTED)
/* variant of gether_setup that allows customizing network device name */
struct eth_dev *gether_setup_name(struct usb_gadget *g,
const char *dev_addr, const char *host_addr,
u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname);
/* netdev setup/teardown as directed by the gadget driver */
/* gether_setup - initialize one ethernet-over-usb link
* @g: gadget to associated with these links
* @ethaddr: NULL, or a buffer in which the ethernet address of the
* host side of the link is recorded
* Context: may sleep
*
* This sets up the single network link that may be exported by a
* gadget driver using this framework. The link layer addresses are
* set up using module parameters.
*
* Returns a eth_dev pointer on success, or an ERR_PTR on failure
*/
static inline struct eth_dev *gether_setup(struct usb_gadget *g,
const char *dev_addr, const char *host_addr,
u8 ethaddr[ETH_ALEN], unsigned qmult)
{
return gether_setup_name(g, dev_addr, host_addr, ethaddr, qmult, "usb");
}
/*
* variant of gether_setup_default that allows customizing
* network device name
*/
struct net_device *gether_setup_name_default(const char *netname);
/*
* gether_register_netdev - register the net device
* @net: net device to register
*
* Registers the net device associated with this ethernet-over-usb link
*
*/
int gether_register_netdev(struct net_device *net);
/* gether_setup_default - initialize one ethernet-over-usb link
* Context: may sleep
*
* This sets up the single network link that may be exported by a
* gadget driver using this framework. The link layer addresses
* are set to random values.
*
* Returns negative errno, or zero on success
*/
static inline struct net_device *gether_setup_default(void)
{
return gether_setup_name_default("usb");
}
/**
* gether_set_gadget - initialize one ethernet-over-usb link with a gadget
* @net: device representing this link
* @g: the gadget to initialize with
*
* This associates one ethernet-over-usb link with a gadget.
*/
void gether_set_gadget(struct net_device *net, struct usb_gadget *g);
/**
* gether_set_dev_addr - initialize an ethernet-over-usb link with eth address
* @net: device representing this link
* @dev_addr: eth address of this device
*
* This sets the device-side Ethernet address of this ethernet-over-usb link
* if dev_addr is correct.
* Returns negative errno if the new address is incorrect.
*/
int gether_set_dev_addr(struct net_device *net, const char *dev_addr);
/**
* gether_get_dev_addr - get an ethernet-over-usb link eth address
* @net: device representing this link
* @dev_addr: place to store device's eth address
* @len: length of the @dev_addr buffer
*
* This gets the device-side Ethernet address of this ethernet-over-usb link.
* Returns zero on success, else negative errno.
*/
int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len);
/**
* gether_set_host_addr - initialize an ethernet-over-usb link with host address
* @net: device representing this link
* @host_addr: eth address of the host
*
* This sets the host-side Ethernet address of this ethernet-over-usb link
* if host_addr is correct.
* Returns negative errno if the new address is incorrect.
*/
int gether_set_host_addr(struct net_device *net, const char *host_addr);
/**
* gether_get_host_addr - get an ethernet-over-usb link host address
* @net: device representing this link
* @host_addr: place to store eth address of the host
* @len: length of the @host_addr buffer
*
* This gets the host-side Ethernet address of this ethernet-over-usb link.
* Returns zero on success, else negative errno.
*/
int gether_get_host_addr(struct net_device *net, char *host_addr, int len);
/**
* gether_get_host_addr_cdc - get an ethernet-over-usb link host address
* @net: device representing this link
* @host_addr: place to store eth address of the host
* @len: length of the @host_addr buffer
*
* This gets the CDC formatted host-side Ethernet address of this
* ethernet-over-usb link.
* Returns zero on success, else negative errno.
*/
int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len);
/**
* gether_get_host_addr_u8 - get an ethernet-over-usb link host address
* @net: device representing this link
* @host_mac: place to store the eth address of the host
*
* This gets the binary formatted host-side Ethernet address of this
* ethernet-over-usb link.
*/
void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]);
/**
* gether_set_qmult - initialize an ethernet-over-usb link with a multiplier
* @net: device representing this link
* @qmult: queue multiplier
*
* This sets the queue length multiplier of this ethernet-over-usb link.
* For higher speeds use longer queues.
*/
void gether_set_qmult(struct net_device *net, unsigned qmult);
/**
* gether_get_qmult - get an ethernet-over-usb link multiplier
* @net: device representing this link
*
* This gets the queue length multiplier of this ethernet-over-usb link.
*/
unsigned gether_get_qmult(struct net_device *net);
/**
* gether_get_ifname - get an ethernet-over-usb link interface name
* @net: device representing this link
* @name: place to store the interface name
* @len: length of the @name buffer
*
* This gets the interface name of this ethernet-over-usb link.
* Returns zero on success, else negative errno.
*/
int gether_get_ifname(struct net_device *net, char *name, int len);
void gether_cleanup(struct eth_dev *dev);
/* connect/disconnect is handled by individual functions */
struct net_device *gether_connect(struct gether *);
void gether_disconnect(struct gether *);
/* Some controllers can't support CDC Ethernet (ECM) ... */
static inline bool can_support_ecm(struct usb_gadget *gadget)
{
if (!gadget_is_altset_supported(gadget))
return false;
/* Everything else is *presumably* fine ... but this is a bit
* chancy, so be **CERTAIN** there are no hardware issues with
* your controller. Add it above if it can't handle CDC.
*/
return true;
}
#endif /* __U_ETHER_H */
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