1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * USB Networking Link Interface
4 *
5 * Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
6 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
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 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #ifndef __LINUX_USB_USBNET_H
24 #define __LINUX_USB_USBNET_H
25
26 /* interface from usbnet core to each USB networking link we handle */
27 struct usbnet {
28 /* housekeeping */
29 struct usb_device *udev;
30 struct usb_interface *intf;
31 struct driver_info *driver_info;
32 const char *driver_name;
33 void *driver_priv;
34 wait_queue_head_t wait;
35 struct mutex phy_mutex;
36 unsigned char suspend_count;
37 unsigned char pkt_cnt, pkt_err;
38 unsigned short rx_qlen, tx_qlen;
39 unsigned can_dma_sg:1;
40
41 /* i/o info: pipes etc */
42 unsigned in, out;
43 struct usb_host_endpoint *status;
44 unsigned maxpacket;
45 struct timer_list delay;
46 const char *padding_pkt;
47
48 /* protocol/interface state */
49 struct net_device *net;
50 int msg_enable;
51 unsigned long data[5];
52 u32 xid;
53 u32 hard_mtu; /* count any extra framing */
54 size_t rx_urb_size; /* size for rx urbs */
55 struct mii_if_info mii;
56
57 /* various kinds of pending driver work */
58 struct sk_buff_head rxq;
59 struct sk_buff_head txq;
60 struct sk_buff_head done;
61 struct sk_buff_head rxq_pause;
62 struct urb *interrupt;
63 unsigned interrupt_count;
64 struct mutex interrupt_mutex;
65 struct usb_anchor deferred;
66 struct tasklet_struct bh;
67
68 struct pcpu_sw_netstats __percpu *stats64;
69
70 struct work_struct kevent;
71 unsigned long flags;
72 # define EVENT_TX_HALT 0
73 # define EVENT_RX_HALT 1
74 # define EVENT_RX_MEMORY 2
75 # define EVENT_STS_SPLIT 3
76 # define EVENT_LINK_RESET 4
77 # define EVENT_RX_PAUSED 5
78 # define EVENT_DEV_ASLEEP 6
79 # define EVENT_DEV_OPEN 7
80 # define EVENT_DEVICE_REPORT_IDLE 8
81 # define EVENT_NO_RUNTIME_PM 9
82 # define EVENT_RX_KILL 10
83 # define EVENT_LINK_CHANGE 11
84 # define EVENT_SET_RX_MODE 12
85 # define EVENT_NO_IP_ALIGN 13
86 };
87
driver_of(struct usb_interface * intf)88 static inline struct usb_driver *driver_of(struct usb_interface *intf)
89 {
90 return to_usb_driver(intf->dev.driver);
91 }
92
93 /* interface from the device/framing level "minidriver" to core */
94 struct driver_info {
95 char *description;
96
97 int flags;
98 /* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
99 #define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
100 #define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
101 #define FLAG_FRAMING_Z 0x0004 /* zaurus adds a trailer */
102 #define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */
103
104 #define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
105 #define FLAG_ETHER 0x0020 /* maybe use "eth%d" names */
106
107 #define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
108 #define FLAG_WLAN 0x0080 /* use "wlan%d" names */
109 #define FLAG_AVOID_UNLINK_URBS 0x0100 /* don't unlink urbs at usbnet_stop() */
110 #define FLAG_SEND_ZLP 0x0200 /* hw requires ZLPs are sent */
111 #define FLAG_WWAN 0x0400 /* use "wwan%d" names */
112
113 #define FLAG_LINK_INTR 0x0800 /* updates link (carrier) status */
114
115 #define FLAG_POINTTOPOINT 0x1000 /* possibly use "usb%d" names */
116
117 /*
118 * Indicates to usbnet, that USB driver accumulates multiple IP packets.
119 * Affects statistic (counters) and short packet handling.
120 */
121 #define FLAG_MULTI_PACKET 0x2000
122 #define FLAG_RX_ASSEMBLE 0x4000 /* rx packets may span >1 frames */
123 #define FLAG_NOARP 0x8000 /* device can't do ARP */
124
125 /* init device ... can sleep, or cause probe() failure */
126 int (*bind)(struct usbnet *, struct usb_interface *);
127
128 /* cleanup device ... can sleep, but can't fail */
129 void (*unbind)(struct usbnet *, struct usb_interface *);
130
131 /* reset device ... can sleep */
132 int (*reset)(struct usbnet *);
133
134 /* stop device ... can sleep */
135 int (*stop)(struct usbnet *);
136
137 /* see if peer is connected ... can sleep */
138 int (*check_connect)(struct usbnet *);
139
140 /* (dis)activate runtime power management */
141 int (*manage_power)(struct usbnet *, int);
142
143 /* for status polling */
144 void (*status)(struct usbnet *, struct urb *);
145
146 /* link reset handling, called from defer_kevent */
147 int (*link_reset)(struct usbnet *);
148
149 /* fixup rx packet (strip framing) */
150 int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
151
152 /* fixup tx packet (add framing) */
153 struct sk_buff *(*tx_fixup)(struct usbnet *dev,
154 struct sk_buff *skb, gfp_t flags);
155
156 /* recover from timeout */
157 void (*recover)(struct usbnet *dev);
158
159 /* early initialization code, can sleep. This is for minidrivers
160 * having 'subminidrivers' that need to do extra initialization
161 * right after minidriver have initialized hardware. */
162 int (*early_init)(struct usbnet *dev);
163
164 /* called by minidriver when receiving indication */
165 void (*indication)(struct usbnet *dev, void *ind, int indlen);
166
167 /* rx mode change (device changes address list filtering) */
168 void (*set_rx_mode)(struct usbnet *dev);
169
170 /* for new devices, use the descriptor-reading code instead */
171 int in; /* rx endpoint */
172 int out; /* tx endpoint */
173
174 unsigned long data; /* Misc driver specific data */
175 };
176
177 /* Minidrivers are just drivers using the "usbnet" core as a powerful
178 * network-specific subroutine library ... that happens to do pretty
179 * much everything except custom framing and chip-specific stuff.
180 */
181 extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
182 extern int usbnet_suspend(struct usb_interface *, pm_message_t);
183 extern int usbnet_resume(struct usb_interface *);
184 extern void usbnet_disconnect(struct usb_interface *);
185 extern void usbnet_device_suggests_idle(struct usbnet *dev);
186
187 extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
188 u16 value, u16 index, void *data, u16 size);
189 extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
190 u16 value, u16 index, const void *data, u16 size);
191 extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
192 u16 value, u16 index, void *data, u16 size);
193 extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
194 u16 value, u16 index, const void *data, u16 size);
195 extern int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
196 u16 value, u16 index, const void *data, u16 size);
197
198 /* Drivers that reuse some of the standard USB CDC infrastructure
199 * (notably, using multiple interfaces according to the CDC
200 * union descriptor) get some helper code.
201 */
202 struct cdc_state {
203 struct usb_cdc_header_desc *header;
204 struct usb_cdc_union_desc *u;
205 struct usb_cdc_ether_desc *ether;
206 struct usb_interface *control;
207 struct usb_interface *data;
208 };
209
210 extern int usbnet_generic_cdc_bind(struct usbnet *, struct usb_interface *);
211 extern int usbnet_ether_cdc_bind(struct usbnet *dev, struct usb_interface *intf);
212 extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *);
213 extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *);
214 extern void usbnet_cdc_status(struct usbnet *, struct urb *);
215
216 /* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
217 #define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
218 |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
219 |USB_CDC_PACKET_TYPE_PROMISCUOUS \
220 |USB_CDC_PACKET_TYPE_DIRECTED)
221
222
223 /* we record the state for each of our queued skbs */
224 enum skb_state {
225 illegal = 0,
226 tx_start, tx_done,
227 rx_start, rx_done, rx_cleanup,
228 unlink_start
229 };
230
231 struct skb_data { /* skb->cb is one of these */
232 struct urb *urb;
233 struct usbnet *dev;
234 enum skb_state state;
235 long length;
236 unsigned long packets;
237 };
238
239 /* Drivers that set FLAG_MULTI_PACKET must call this in their
240 * tx_fixup method before returning an skb.
241 */
242 static inline void
usbnet_set_skb_tx_stats(struct sk_buff * skb,unsigned long packets,long bytes_delta)243 usbnet_set_skb_tx_stats(struct sk_buff *skb,
244 unsigned long packets, long bytes_delta)
245 {
246 struct skb_data *entry = (struct skb_data *) skb->cb;
247
248 entry->packets = packets;
249 entry->length = bytes_delta;
250 }
251
252 extern int usbnet_open(struct net_device *net);
253 extern int usbnet_stop(struct net_device *net);
254 extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb,
255 struct net_device *net);
256 extern void usbnet_tx_timeout(struct net_device *net);
257 extern int usbnet_change_mtu(struct net_device *net, int new_mtu);
258
259 extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
260 extern int usbnet_get_ethernet_addr(struct usbnet *, int);
261 extern void usbnet_defer_kevent(struct usbnet *, int);
262 extern void usbnet_skb_return(struct usbnet *, struct sk_buff *);
263 extern void usbnet_unlink_rx_urbs(struct usbnet *);
264
265 extern void usbnet_pause_rx(struct usbnet *);
266 extern void usbnet_resume_rx(struct usbnet *);
267 extern void usbnet_purge_paused_rxq(struct usbnet *);
268
269 extern int usbnet_get_link_ksettings(struct net_device *net,
270 struct ethtool_link_ksettings *cmd);
271 extern int usbnet_set_link_ksettings(struct net_device *net,
272 const struct ethtool_link_ksettings *cmd);
273 extern u32 usbnet_get_link(struct net_device *net);
274 extern u32 usbnet_get_msglevel(struct net_device *);
275 extern void usbnet_set_msglevel(struct net_device *, u32);
276 extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
277 extern int usbnet_nway_reset(struct net_device *net);
278
279 extern int usbnet_manage_power(struct usbnet *, int);
280 extern void usbnet_link_change(struct usbnet *, bool, bool);
281
282 extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
283 extern void usbnet_status_stop(struct usbnet *dev);
284
285 extern void usbnet_update_max_qlen(struct usbnet *dev);
286 extern void usbnet_get_stats64(struct net_device *dev,
287 struct rtnl_link_stats64 *stats);
288
289 #endif /* __LINUX_USB_USBNET_H */
290
