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1/*
2 * u_ether.h -- interface to USB gadget "ethernet link" utilities
3 *
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6 * Copyright (C) 2008 Nokia Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#ifndef __U_ETHER_H
15#define __U_ETHER_H
16
17#include <linux/err.h>
18#include <linux/if_ether.h>
19#include <linux/usb/composite.h>
20#include <linux/usb/cdc.h>
21#include <linux/netdevice.h>
22
23#define QMULT_DEFAULT 5
24
25/*
26 * dev_addr: initial value
27 * changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx"
28 * host_addr: this address is invisible to ifconfig
29 */
30#define USB_ETHERNET_MODULE_PARAMETERS() \
31 static unsigned qmult = QMULT_DEFAULT; \
32 module_param(qmult, uint, S_IRUGO|S_IWUSR); \
33 MODULE_PARM_DESC(qmult, "queue length multiplier at high/super speed");\
34 \
35 static char *dev_addr; \
36 module_param(dev_addr, charp, S_IRUGO); \
37 MODULE_PARM_DESC(dev_addr, "Device Ethernet Address"); \
38 \
39 static char *host_addr; \
40 module_param(host_addr, charp, S_IRUGO); \
41 MODULE_PARM_DESC(host_addr, "Host Ethernet Address")
42
43struct eth_dev;
44
45/*
46 * This represents the USB side of an "ethernet" link, managed by a USB
47 * function which provides control and (maybe) framing. Two functions
48 * in different configurations could share the same ethernet link/netdev,
49 * using different host interaction models.
50 *
51 * There is a current limitation that only one instance of this link may
52 * be present in any given configuration. When that's a problem, network
53 * layer facilities can be used to package multiple logical links on this
54 * single "physical" one.
55 */
56struct gether {
57 struct usb_function func;
58
59 /* updated by gether_{connect,disconnect} */
60 struct eth_dev *ioport;
61
62 /* endpoints handle full and/or high speeds */
63 struct usb_ep *in_ep;
64 struct usb_ep *out_ep;
65
66 bool is_zlp_ok;
67 bool no_skb_reserve;
68
69 u16 cdc_filter;
70
71 /* hooks for added framing, as needed for RNDIS and EEM. */
72 u32 header_len;
73 /* NCM requires fixed size bundles */
74 bool is_fixed;
75 u32 fixed_out_len;
76 u32 fixed_in_len;
77 bool supports_multi_frame;
78 struct sk_buff *(*wrap)(struct gether *port,
79 struct sk_buff *skb);
80 int (*unwrap)(struct gether *port,
81 struct sk_buff *skb,
82 struct sk_buff_head *list);
83
84 /* called on network open/close */
85 void (*open)(struct gether *);
86 void (*close)(struct gether *);
87};
88
89#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
90 |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
91 |USB_CDC_PACKET_TYPE_PROMISCUOUS \
92 |USB_CDC_PACKET_TYPE_DIRECTED)
93
94/* variant of gether_setup that allows customizing network device name */
95struct eth_dev *gether_setup_name(struct usb_gadget *g,
96 const char *dev_addr, const char *host_addr,
97 u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname);
98
99/* netdev setup/teardown as directed by the gadget driver */
100/* gether_setup - initialize one ethernet-over-usb link
101 * @g: gadget to associated with these links
102 * @ethaddr: NULL, or a buffer in which the ethernet address of the
103 * host side of the link is recorded
104 * Context: may sleep
105 *
106 * This sets up the single network link that may be exported by a
107 * gadget driver using this framework. The link layer addresses are
108 * set up using module parameters.
109 *
110 * Returns a eth_dev pointer on success, or an ERR_PTR on failure
111 */
112static inline struct eth_dev *gether_setup(struct usb_gadget *g,
113 const char *dev_addr, const char *host_addr,
114 u8 ethaddr[ETH_ALEN], unsigned qmult)
115{
116 return gether_setup_name(g, dev_addr, host_addr, ethaddr, qmult, "usb");
117}
118
119/*
120 * variant of gether_setup_default that allows customizing
121 * network device name
122 */
123struct net_device *gether_setup_name_default(const char *netname);
124
125/*
126 * gether_register_netdev - register the net device
127 * @net: net device to register
128 *
129 * Registers the net device associated with this ethernet-over-usb link
130 *
131 */
132int gether_register_netdev(struct net_device *net);
133
134/* gether_setup_default - initialize one ethernet-over-usb link
135 * Context: may sleep
136 *
137 * This sets up the single network link that may be exported by a
138 * gadget driver using this framework. The link layer addresses
139 * are set to random values.
140 *
141 * Returns negative errno, or zero on success
142 */
143static inline struct net_device *gether_setup_default(void)
144{
145 return gether_setup_name_default("usb");
146}
147
148/**
149 * gether_set_gadget - initialize one ethernet-over-usb link with a gadget
150 * @net: device representing this link
151 * @g: the gadget to initialize with
152 *
153 * This associates one ethernet-over-usb link with a gadget.
154 */
155void gether_set_gadget(struct net_device *net, struct usb_gadget *g);
156
157/**
158 * gether_set_dev_addr - initialize an ethernet-over-usb link with eth address
159 * @net: device representing this link
160 * @dev_addr: eth address of this device
161 *
162 * This sets the device-side Ethernet address of this ethernet-over-usb link
163 * if dev_addr is correct.
164 * Returns negative errno if the new address is incorrect.
165 */
166int gether_set_dev_addr(struct net_device *net, const char *dev_addr);
167
168/**
169 * gether_get_dev_addr - get an ethernet-over-usb link eth address
170 * @net: device representing this link
171 * @dev_addr: place to store device's eth address
172 * @len: length of the @dev_addr buffer
173 *
174 * This gets the device-side Ethernet address of this ethernet-over-usb link.
175 * Returns zero on success, else negative errno.
176 */
177int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len);
178
179/**
180 * gether_set_host_addr - initialize an ethernet-over-usb link with host address
181 * @net: device representing this link
182 * @host_addr: eth address of the host
183 *
184 * This sets the host-side Ethernet address of this ethernet-over-usb link
185 * if host_addr is correct.
186 * Returns negative errno if the new address is incorrect.
187 */
188int gether_set_host_addr(struct net_device *net, const char *host_addr);
189
190/**
191 * gether_get_host_addr - get an ethernet-over-usb link host address
192 * @net: device representing this link
193 * @host_addr: place to store eth address of the host
194 * @len: length of the @host_addr buffer
195 *
196 * This gets the host-side Ethernet address of this ethernet-over-usb link.
197 * Returns zero on success, else negative errno.
198 */
199int gether_get_host_addr(struct net_device *net, char *host_addr, int len);
200
201/**
202 * gether_get_host_addr_cdc - get an ethernet-over-usb link host address
203 * @net: device representing this link
204 * @host_addr: place to store eth address of the host
205 * @len: length of the @host_addr buffer
206 *
207 * This gets the CDC formatted host-side Ethernet address of this
208 * ethernet-over-usb link.
209 * Returns zero on success, else negative errno.
210 */
211int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len);
212
213/**
214 * gether_get_host_addr_u8 - get an ethernet-over-usb link host address
215 * @net: device representing this link
216 * @host_mac: place to store the eth address of the host
217 *
218 * This gets the binary formatted host-side Ethernet address of this
219 * ethernet-over-usb link.
220 */
221void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]);
222
223/**
224 * gether_set_qmult - initialize an ethernet-over-usb link with a multiplier
225 * @net: device representing this link
226 * @qmult: queue multiplier
227 *
228 * This sets the queue length multiplier of this ethernet-over-usb link.
229 * For higher speeds use longer queues.
230 */
231void gether_set_qmult(struct net_device *net, unsigned qmult);
232
233/**
234 * gether_get_qmult - get an ethernet-over-usb link multiplier
235 * @net: device representing this link
236 *
237 * This gets the queue length multiplier of this ethernet-over-usb link.
238 */
239unsigned gether_get_qmult(struct net_device *net);
240
241/**
242 * gether_get_ifname - get an ethernet-over-usb link interface name
243 * @net: device representing this link
244 * @name: place to store the interface name
245 * @len: length of the @name buffer
246 *
247 * This gets the interface name of this ethernet-over-usb link.
248 * Returns zero on success, else negative errno.
249 */
250int gether_get_ifname(struct net_device *net, char *name, int len);
251
252void gether_cleanup(struct eth_dev *dev);
253
254/* connect/disconnect is handled by individual functions */
255struct net_device *gether_connect(struct gether *);
256void gether_disconnect(struct gether *);
257
258/* Some controllers can't support CDC Ethernet (ECM) ... */
259static inline bool can_support_ecm(struct usb_gadget *gadget)
260{
261 if (!gadget_is_altset_supported(gadget))
262 return false;
263
264 /* Everything else is *presumably* fine ... but this is a bit
265 * chancy, so be **CERTAIN** there are no hardware issues with
266 * your controller. Add it above if it can't handle CDC.
267 */
268 return true;
269}
270
271#endif /* __U_ETHER_H */