// SPDX-License-Identifier: GPL-2.0+
/*
 * USB Networking Link Interface
 *
 * Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __LINUX_USB_USBNET_H
#define __LINUX_USB_USBNET_H

/* interface from usbnet core to each USB networking link we handle */
struct usbnet {
    /* housekeeping */
    struct usb_device *udev;
    struct usb_interface *intf;
    const struct driver_info *driver_info;
    const char *driver_name;
    void *driver_priv;
    wait_queue_head_t wait;
    struct mutex phy_mutex;
    unsigned char suspend_count;
    unsigned char pkt_cnt, pkt_err;
    unsigned short rx_qlen, tx_qlen;
    unsigned can_dma_sg : 1;

    /* i/o info: pipes etc */
    unsigned in, out;
    struct usb_host_endpoint *status;
    unsigned maxpacket;
    struct timer_list delay;
    const char *padding_pkt;

    /* protocol/interface state */
    struct net_device *net;
    int msg_enable;
    unsigned long data[5];
    u32 xid;
    u32 hard_mtu;       /* count any extra framing */
    size_t rx_urb_size; /* size for rx urbs */
    struct mii_if_info mii;

    /* various kinds of pending driver work */
    struct sk_buff_head rxq;
    struct sk_buff_head txq;
    struct sk_buff_head done;
    struct sk_buff_head rxq_pause;
    struct urb *interrupt;
    unsigned interrupt_count;
    struct mutex interrupt_mutex;
    struct usb_anchor deferred;
    struct tasklet_struct bh;

    struct pcpu_sw_netstats __percpu *stats64;

    struct work_struct kevent;
    unsigned long flags;
#define EVENT_TX_HALT 0
#define EVENT_RX_HALT 1
#define EVENT_RX_MEMORY 2
#define EVENT_STS_SPLIT 3
#define EVENT_LINK_RESET 4
#define EVENT_RX_PAUSED 5
#define EVENT_DEV_ASLEEP 6
#define EVENT_DEV_OPEN 7
#define EVENT_DEVICE_REPORT_IDLE 8
#define EVENT_NO_RUNTIME_PM 9
#define EVENT_RX_KILL 10
#define EVENT_LINK_CHANGE 11
#define EVENT_SET_RX_MODE 12
#define EVENT_NO_IP_ALIGN 13
};

static inline struct usb_driver *driver_of(struct usb_interface *intf)
{
    return to_usb_driver(intf->dev.driver);
}

/* interface from the device/framing level "minidriver" to core */
struct driver_info {
    char *description;

    int flags;
/* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
#define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
#define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
#define FLAG_FRAMING_Z 0x0004  /* zaurus adds a trailer */
#define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */

#define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
#define FLAG_ETHER 0x0020     /* maybe use "eth%d" names */

#define FLAG_FRAMING_AX 0x0040        /* AX88772/178 packets */
#define FLAG_WLAN 0x0080              /* use "wlan%d" names */
#define FLAG_AVOID_UNLINK_URBS 0x0100 /* don't unlink urbs at usbnet_stop() */
#define FLAG_SEND_ZLP 0x0200          /* hw requires ZLPs are sent */
#define FLAG_WWAN 0x0400              /* use "wwan%d" names */

#define FLAG_LINK_INTR 0x0800 /* updates link (carrier) status */

#define FLAG_POINTTOPOINT 0x1000 /* possibly use "usb%d" names */

/*
 * Indicates to usbnet, that USB driver accumulates multiple IP packets.
 * Affects statistic (counters) and short packet handling.
 */
#define FLAG_MULTI_PACKET 0x2000
#define FLAG_RX_ASSEMBLE 0x4000 /* rx packets may span >1 frames */
#define FLAG_NOARP 0x8000       /* device can't do ARP */

    /* init device ... can sleep, or cause probe() failure */
    int (*bind)(struct usbnet *, struct usb_interface *);

    /* cleanup device ... can sleep, but can't fail */
    void (*unbind)(struct usbnet *, struct usb_interface *);

    /* reset device ... can sleep */
    int (*reset)(struct usbnet *);

    /* stop device ... can sleep */
    int (*stop)(struct usbnet *);

    /* see if peer is connected ... can sleep */
    int (*check_connect)(struct usbnet *);

    /* (dis)activate runtime power management */
    int (*manage_power)(struct usbnet *, int);

    /* for status polling */
    void (*status)(struct usbnet *, struct urb *);

    /* link reset handling, called from defer_kevent */
    int (*link_reset)(struct usbnet *);

    /* fixup rx packet (strip framing) */
    int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);

    /* fixup tx packet (add framing) */
    struct sk_buff *(*tx_fixup)(struct usbnet *dev, struct sk_buff *skb, gfp_t flags);

    /* recover from timeout */
    void (*recover)(struct usbnet *dev);

    /* early initialization code, can sleep. This is for minidrivers
     * having 'subminidrivers' that need to do extra initialization
     * right after minidriver have initialized hardware. */
    int (*early_init)(struct usbnet *dev);

    /* called by minidriver when receiving indication */
    void (*indication)(struct usbnet *dev, void *ind, int indlen);

    /* rx mode change (device changes address list filtering) */
    void (*set_rx_mode)(struct usbnet *dev);

    /* for new devices, use the descriptor-reading code instead */
    int in;  /* rx endpoint */
    int out; /* tx endpoint */

    unsigned long data; /* Misc driver specific data */
};

/* Minidrivers are just drivers using the "usbnet" core as a powerful
 * network-specific subroutine library ... that happens to do pretty
 * much everything except custom framing and chip-specific stuff.
 */
extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
extern int usbnet_suspend(struct usb_interface *, pm_message_t);
extern int usbnet_resume(struct usb_interface *);
extern void usbnet_disconnect(struct usb_interface *);
extern void usbnet_device_suggests_idle(struct usbnet *dev);

extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, u16 value, u16 index, void *data, u16 size);
extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, u16 value, u16 index, const void *data, u16 size);
extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, u16 value, u16 index, void *data, u16 size);
extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, u16 value, u16 index, const void *data,
                                 u16 size);
extern int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, u16 value, u16 index, const void *data,
                                  u16 size);

/* Drivers that reuse some of the standard USB CDC infrastructure
 * (notably, using multiple interfaces according to the CDC
 * union descriptor) get some helper code.
 */
struct cdc_state {
    struct usb_cdc_header_desc *header;
    struct usb_cdc_union_desc *u;
    struct usb_cdc_ether_desc *ether;
    struct usb_interface *control;
    struct usb_interface *data;
};

extern void usbnet_cdc_update_filter(struct usbnet *dev);
extern int usbnet_generic_cdc_bind(struct usbnet *, struct usb_interface *);
extern int usbnet_ether_cdc_bind(struct usbnet *dev, struct usb_interface *intf);
extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *);
extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *);
extern void usbnet_cdc_status(struct usbnet *, struct urb *);

/* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
#define DEFAULT_FILTER                                                                                                 \
    (USB_CDC_PACKET_TYPE_BROADCAST | USB_CDC_PACKET_TYPE_ALL_MULTICAST | USB_CDC_PACKET_TYPE_PROMISCUOUS |             \
     USB_CDC_PACKET_TYPE_DIRECTED)

/* we record the state for each of our queued skbs */
enum skb_state { illegal = 0, tx_start, tx_done, rx_start, rx_done, rx_cleanup, unlink_start };

struct skb_data { /* skb->cb is one of these */
    struct urb *urb;
    struct usbnet *dev;
    enum skb_state state;
    long length;
    unsigned long packets;
};

/* Drivers that set FLAG_MULTI_PACKET must call this in their
 * tx_fixup method before returning an skb.
 */
static inline void usbnet_set_skb_tx_stats(struct sk_buff *skb, unsigned long packets, long bytes_delta)
{
    struct skb_data *entry = (struct skb_data *)skb->cb;

    entry->packets = packets;
    entry->length = bytes_delta;
}

extern int usbnet_open(struct net_device *net);
extern int usbnet_stop(struct net_device *net);
extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb, struct net_device *net);
extern void usbnet_tx_timeout(struct net_device *net, unsigned int txqueue);
extern int usbnet_change_mtu(struct net_device *net, int new_mtu);

extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
extern int usbnet_get_ethernet_addr(struct usbnet *, int);
extern void usbnet_defer_kevent(struct usbnet *, int);
extern void usbnet_skb_return(struct usbnet *, struct sk_buff *);
extern void usbnet_unlink_rx_urbs(struct usbnet *);

extern void usbnet_pause_rx(struct usbnet *);
extern void usbnet_resume_rx(struct usbnet *);
extern void usbnet_purge_paused_rxq(struct usbnet *);

extern int usbnet_get_link_ksettings(struct net_device *net, struct ethtool_link_ksettings *cmd);
extern int usbnet_set_link_ksettings(struct net_device *net, const struct ethtool_link_ksettings *cmd);
extern u32 usbnet_get_link(struct net_device *net);
extern u32 usbnet_get_msglevel(struct net_device *);
extern void usbnet_set_msglevel(struct net_device *, u32);
extern void usbnet_set_rx_mode(struct net_device *net);
extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
extern int usbnet_nway_reset(struct net_device *net);

extern int usbnet_manage_power(struct usbnet *, int);
extern void usbnet_link_change(struct usbnet *, bool, bool);

extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
extern void usbnet_status_stop(struct usbnet *dev);

extern void usbnet_update_max_qlen(struct usbnet *dev);
extern void usbnet_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats);

#endif /* __LINUX_USB_USBNET_H */