linux/include/linux/usb/usbnet.h
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   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 */
  27struct 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
  88static 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 */
  94struct 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 */
 181extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
 182extern int usbnet_suspend(struct usb_interface *, pm_message_t);
 183extern int usbnet_resume(struct usb_interface *);
 184extern void usbnet_disconnect(struct usb_interface *);
 185extern void usbnet_device_suggests_idle(struct usbnet *dev);
 186
 187extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 188                    u16 value, u16 index, void *data, u16 size);
 189extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 190                    u16 value, u16 index, const void *data, u16 size);
 191extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
 192                    u16 value, u16 index, void *data, u16 size);
 193extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
 194                    u16 value, u16 index, const void *data, u16 size);
 195extern 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 */
 202struct 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
 210extern int usbnet_generic_cdc_bind(struct usbnet *, struct usb_interface *);
 211extern int usbnet_ether_cdc_bind(struct usbnet *dev, struct usb_interface *intf);
 212extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *);
 213extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *);
 214extern 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 */
 224enum skb_state {
 225        illegal = 0,
 226        tx_start, tx_done,
 227        rx_start, rx_done, rx_cleanup,
 228        unlink_start
 229};
 230
 231struct 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 */
 242static inline void
 243usbnet_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
 252extern int usbnet_open(struct net_device *net);
 253extern int usbnet_stop(struct net_device *net);
 254extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb,
 255                                     struct net_device *net);
 256extern void usbnet_tx_timeout(struct net_device *net);
 257extern int usbnet_change_mtu(struct net_device *net, int new_mtu);
 258
 259extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
 260extern int usbnet_get_ethernet_addr(struct usbnet *, int);
 261extern void usbnet_defer_kevent(struct usbnet *, int);
 262extern void usbnet_skb_return(struct usbnet *, struct sk_buff *);
 263extern void usbnet_unlink_rx_urbs(struct usbnet *);
 264
 265extern void usbnet_pause_rx(struct usbnet *);
 266extern void usbnet_resume_rx(struct usbnet *);
 267extern void usbnet_purge_paused_rxq(struct usbnet *);
 268
 269extern int usbnet_get_link_ksettings(struct net_device *net,
 270                                     struct ethtool_link_ksettings *cmd);
 271extern int usbnet_set_link_ksettings(struct net_device *net,
 272                                     const struct ethtool_link_ksettings *cmd);
 273extern u32 usbnet_get_link(struct net_device *net);
 274extern u32 usbnet_get_msglevel(struct net_device *);
 275extern void usbnet_set_msglevel(struct net_device *, u32);
 276extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
 277extern int usbnet_nway_reset(struct net_device *net);
 278
 279extern int usbnet_manage_power(struct usbnet *, int);
 280extern void usbnet_link_change(struct usbnet *, bool, bool);
 281
 282extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
 283extern void usbnet_status_stop(struct usbnet *dev);
 284
 285extern void usbnet_update_max_qlen(struct usbnet *dev);
 286extern void usbnet_get_stats64(struct net_device *dev,
 287                               struct rtnl_link_stats64 *stats);
 288
 289#endif /* __LINUX_USB_USBNET_H */
 290
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