/* 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 */ #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 *); bool is_suspend; }; #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_attach_gadget - Reparent net_device to the gadget device. * @net: The network device to reparent. * @g: The target USB gadget device to parent to. * * This function moves the network device to be a child of the USB gadget * device in the device hierarchy. This is typically done when the function * is bound to a configuration. * * Returns 0 on success, or a negative error code on failure. */ int gether_attach_gadget(struct net_device *net, struct usb_gadget *g); /** * gether_detach_gadget - Detach net_device from its gadget parent. * @net: The network device to detach. * * This function moves the network device to be a child of the virtual * devices parent, effectively detaching it from the USB gadget device * hierarchy. This is typically done when the function is unbound * from a configuration but the instance is not yet freed. */ void gether_detach_gadget(struct net_device *net); DEFINE_FREE(detach_gadget, struct net_device *, if (_T) gether_detach_gadget(_T)) /** * 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); /** * gether_set_ifname - set an ethernet-over-usb link interface name * @net: device representing this link * @name: new interface name * @len: length of @name * * This sets the interface name of this ethernet-over-usb link. * A single terminating newline, if any, is ignored. * Returns zero on success, else negative errno. */ int gether_set_ifname(struct net_device *net, const char *name, int len); void gether_cleanup(struct eth_dev *dev); void gether_suspend(struct gether *link); void gether_resume(struct gether *link); /* 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; } /* peak (theoretical) bulk transfer rate in bits-per-second */ static inline unsigned int gether_bitrate(struct usb_gadget *g) { if (g->speed >= USB_SPEED_SUPER_PLUS) return 4250000000U; if (g->speed == USB_SPEED_SUPER) return 3750000000U; else if (g->speed == USB_SPEED_HIGH) return 13 * 512 * 8 * 1000 * 8; else return 19 * 64 * 1 * 1000 * 8; } #endif /* __U_ETHER_H */
