/* * f_ncm.c -- USB CDC Network (NCM) link function driver * * Copyright (C) 2010 Nokia Corporation * Contact: Yauheni Kaliuta * * The driver borrows from f_ecm.c which is: * * Copyright (C) 2003-2005,2008 David Brownell * Copyright (C) 2008 Nokia Corporation * * 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. */ #include #include #include #include #include #include #include "u_ether.h" #include "u_ether_configfs.h" #include "u_ncm.h" /* * This function is a "CDC Network Control Model" (CDC NCM) Ethernet link. * NCM is intended to be used with high-speed network attachments. * * Note that NCM requires the use of "alternate settings" for its data * interface. This means that the set_alt() method has real work to do, * and also means that a get_alt() method is required. */ /* to trigger crc/non-crc ndp signature */ #define NCM_NDP_HDR_CRC_MASK 0x01000000 #define NCM_NDP_HDR_CRC 0x01000000 #define NCM_NDP_HDR_NOCRC 0x00000000 enum ncm_notify_state { NCM_NOTIFY_NONE, /* don't notify */ NCM_NOTIFY_CONNECT, /* issue CONNECT next */ NCM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */ }; struct f_ncm { struct gether port; u8 ctrl_id, data_id; char ethaddr[14]; struct usb_ep *notify; struct usb_request *notify_req; u8 notify_state; atomic_t notify_count; bool is_open; const struct ndp_parser_opts *parser_opts; bool is_crc; u32 ndp_sign; /* * for notification, it is accessed from both * callback and ethernet open/close */ spinlock_t lock; struct net_device *netdev; /* For multi-frame NDP TX */ struct sk_buff *skb_tx_data; struct sk_buff *skb_tx_ndp; u16 ndp_dgram_count; bool timer_force_tx; struct tasklet_struct tx_tasklet; struct hrtimer task_timer; bool timer_stopping; }; static inline struct f_ncm *func_to_ncm(struct usb_function *f) { return container_of(f, struct f_ncm, port.func); } /* peak (theoretical) bulk transfer rate in bits-per-second */ static inline unsigned ncm_bitrate(struct usb_gadget *g) { if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) return 13 * 512 * 8 * 1000 * 8; else return 19 * 64 * 1 * 1000 * 8; } /*-------------------------------------------------------------------------*/ /* * We cannot group frames so use just the minimal size which ok to put * one max-size ethernet frame. * If the host can group frames, allow it to do that, 16K is selected, * because it's used by default by the current linux host driver */ #define NTB_DEFAULT_IN_SIZE 16384 #define NTB_OUT_SIZE 16384 /* Allocation for storing the NDP, 32 should suffice for a * 16k packet. This allows a maximum of 32 * 507 Byte packets to * be transmitted in a single 16kB skb, though when sending full size * packets this limit will be plenty. * Smaller packets are not likely to be trying to maximize the * throughput and will be mstly sending smaller infrequent frames. */ #define TX_MAX_NUM_DPE 32 /* Delay for the transmit to wait before sending an unfilled NTB frame. */ #define TX_TIMEOUT_NSECS 300000 #define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \ USB_CDC_NCM_NTB32_SUPPORTED) static struct usb_cdc_ncm_ntb_parameters ntb_parameters = { .wLength = cpu_to_le16(sizeof(ntb_parameters)), .bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED), .dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE), .wNdpInDivisor = cpu_to_le16(4), .wNdpInPayloadRemainder = cpu_to_le16(0), .wNdpInAlignment = cpu_to_le16(4), .dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE), .wNdpOutDivisor = cpu_to_le16(4), .wNdpOutPayloadRemainder = cpu_to_le16(0), .wNdpOutAlignment = cpu_to_le16(4), }; /* * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one * packet, to simplify cancellation; and a big transfer interval, to * waste less bandwidth. */ #define NCM_STATUS_INTERVAL_MS 32 #define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */ static struct usb_interface_assoc_descriptor ncm_iad_desc = { .bLength = sizeof ncm_iad_desc, .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, /* .bFirstInterface = DYNAMIC, */ .bInterfaceCount = 2, /* control + data */ .bFunctionClass = USB_CLASS_COMM, .bFunctionSubClass = USB_CDC_SUBCLASS_NCM, .bFunctionProtocol = USB_CDC_PROTO_NONE, /* .iFunction = DYNAMIC */ }; /* interface descriptor: */ static struct usb_interface_descriptor ncm_control_intf = { .bLength = sizeof ncm_control_intf, .bDescriptorType = USB_DT_INTERFACE, /* .bInterfaceNumber = DYNAMIC */ .bNumEndpoints = 1, .bInterfaceClass = USB_CLASS_COMM, .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, .bInterfaceProtocol = USB_CDC_PROTO_NONE, /* .iInterface = DYNAMIC */ }; static struct usb_cdc_header_desc ncm_header_desc = { .bLength = sizeof ncm_header_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_HEADER_TYPE, .bcdCDC = cpu_to_le16(0x0110), }; static struct usb_cdc_union_desc ncm_union_desc = { .bLength = sizeof(ncm_union_desc), .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_UNION_TYPE, /* .bMasterInterface0 = DYNAMIC */ /* .bSlaveInterface0 = DYNAMIC */ }; static struct usb_cdc_ether_desc ecm_desc = { .bLength = sizeof ecm_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_ETHERNET_TYPE, /* this descriptor actually adds value, surprise! */ /* .iMACAddress = DYNAMIC */ .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */ .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN), .wNumberMCFilters = cpu_to_le16(0), .bNumberPowerFilters = 0, }; #define NCAPS (USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE) static struct usb_cdc_ncm_desc ncm_desc = { .bLength = sizeof ncm_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_NCM_TYPE, .bcdNcmVersion = cpu_to_le16(0x0100), /* can process SetEthernetPacketFilter */ .bmNetworkCapabilities = NCAPS, }; /* the default data interface has no endpoints ... */ static struct usb_interface_descriptor ncm_data_nop_intf = { .bLength = sizeof ncm_data_nop_intf, .bDescriptorType = USB_DT_INTERFACE, .bInterfaceNumber = 1, .bAlternateSetting = 0, .bNumEndpoints = 0, .bInterfaceClass = USB_CLASS_CDC_DATA, .bInterfaceSubClass = 0, .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB, /* .iInterface = DYNAMIC */ }; /* ... but the "real" data interface has two bulk endpoints */ static struct usb_interface_descriptor ncm_data_intf = { .bLength = sizeof ncm_data_intf, .bDescriptorType = USB_DT_INTERFACE, .bInterfaceNumber = 1, .bAlternateSetting = 1, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_CDC_DATA, .bInterfaceSubClass = 0, .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB, /* .iInterface = DYNAMIC */ }; /* full speed support: */ static struct usb_endpoint_descriptor fs_ncm_notify_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), .bInterval = NCM_STATUS_INTERVAL_MS, }; static struct usb_endpoint_descriptor fs_ncm_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_endpoint_descriptor fs_ncm_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_descriptor_header *ncm_fs_function[] = { (struct usb_descriptor_header *) &ncm_iad_desc, /* CDC NCM control descriptors */ (struct usb_descriptor_header *) &ncm_control_intf, (struct usb_descriptor_header *) &ncm_header_desc, (struct usb_descriptor_header *) &ncm_union_desc, (struct usb_descriptor_header *) &ecm_desc, (struct usb_descriptor_header *) &ncm_desc, (struct usb_descriptor_header *) &fs_ncm_notify_desc, /* data interface, altsettings 0 and 1 */ (struct usb_descriptor_header *) &ncm_data_nop_intf, (struct usb_descriptor_header *) &ncm_data_intf, (struct usb_descriptor_header *) &fs_ncm_in_desc, (struct usb_descriptor_header *) &fs_ncm_out_desc, NULL, }; /* high speed support: */ static struct usb_endpoint_descriptor hs_ncm_notify_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_INT, .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), .bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS), }; static struct usb_endpoint_descriptor hs_ncm_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_endpoint_descriptor hs_ncm_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_descriptor_header *ncm_hs_function[] = { (struct usb_descriptor_header *) &ncm_iad_desc, /* CDC NCM control descriptors */ (struct usb_descriptor_header *) &ncm_control_intf, (struct usb_descriptor_header *) &ncm_header_desc, (struct usb_descriptor_header *) &ncm_union_desc, (struct usb_descriptor_header *) &ecm_desc, (struct usb_descriptor_header *) &ncm_desc, (struct usb_descriptor_header *) &hs_ncm_notify_desc, /* data interface, altsettings 0 and 1 */ (struct usb_descriptor_header *) &ncm_data_nop_intf, (struct usb_descriptor_header *) &ncm_data_intf, (struct usb_descriptor_header *) &hs_ncm_in_desc, (struct usb_descriptor_header *) &hs_ncm_out_desc, NULL, }; /* string descriptors: */ #define STRING_CTRL_IDX 0 #define STRING_MAC_IDX 1 #define STRING_DATA_IDX 2 #define STRING_IAD_IDX 3 static struct usb_string ncm_string_defs[] = { [STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)", [STRING_MAC_IDX].s = "", [STRING_DATA_IDX].s = "CDC Network Data", [STRING_IAD_IDX].s = "CDC NCM", { } /* end of list */ }; static struct usb_gadget_strings ncm_string_table = { .language = 0x0409, /* en-us */ .strings = ncm_string_defs, }; static struct usb_gadget_strings *ncm_strings[] = { &ncm_string_table, NULL, }; /* * Here are options for NCM Datagram Pointer table (NDP) parser. * There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3), * in NDP16 offsets and sizes fields are 1 16bit word wide, * in NDP32 -- 2 16bit words wide. Also signatures are different. * To make the parser code the same, put the differences in the structure, * and switch pointers to the structures when the format is changed. */ struct ndp_parser_opts { u32 nth_sign; u32 ndp_sign; unsigned nth_size; unsigned ndp_size; unsigned dpe_size; unsigned ndplen_align; /* sizes in u16 units */ unsigned dgram_item_len; /* index or length */ unsigned block_length; unsigned ndp_index; unsigned reserved1; unsigned reserved2; unsigned next_ndp_index; }; #define INIT_NDP16_OPTS { \ .nth_sign = USB_CDC_NCM_NTH16_SIGN, \ .ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN, \ .nth_size = sizeof(struct usb_cdc_ncm_nth16), \ .ndp_size = sizeof(struct usb_cdc_ncm_ndp16), \ .dpe_size = sizeof(struct usb_cdc_ncm_dpe16), \ .ndplen_align = 4, \ .dgram_item_len = 1, \ .block_length = 1, \ .ndp_index = 1, \ .reserved1 = 0, \ .reserved2 = 0, \ .next_ndp_index = 1, \ } #define INIT_NDP32_OPTS { \ .nth_sign = USB_CDC_NCM_NTH32_SIGN, \ .ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN, \ .nth_size = sizeof(struct usb_cdc_ncm_nth32), \ .ndp_size = sizeof(struct usb_cdc_ncm_ndp32), \ .dpe_size = sizeof(struct usb_cdc_ncm_dpe32), \ .ndplen_align = 8, \ .dgram_item_len = 2, \ .block_length = 2, \ .ndp_index = 2, \ .reserved1 = 1, \ .reserved2 = 2, \ .next_ndp_index = 2, \ } static const struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS; static const struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS; static inline void put_ncm(__le16 **p, unsigned size, unsigned val) { switch (size) { case 1: put_unaligned_le16((u16)val, *p); break; case 2: put_unaligned_le32((u32)val, *p); break; default: BUG(); } *p += size; } static inline unsigned get_ncm(__le16 **p, unsigned size) { unsigned tmp; switch (size) { case 1: tmp = get_unaligned_le16(*p); break; case 2: tmp = get_unaligned_le32(*p); break; default: BUG(); } *p += size; return tmp; } /*-------------------------------------------------------------------------*/ static inline void ncm_reset_values(struct f_ncm *ncm) { ncm->parser_opts = &ndp16_opts; ncm->is_crc = false; ncm->port.cdc_filter = DEFAULT_FILTER; /* doesn't make sense for ncm, fixed size used */ ncm->port.header_len = 0; ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize); ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE; } /* * Context: ncm->lock held */ static void ncm_do_notify(struct f_ncm *ncm) { struct usb_request *req = ncm->notify_req; struct usb_cdc_notification *event; struct usb_composite_dev *cdev = ncm->port.func.config->cdev; __le32 *data; int status; /* notification already in flight? */ if (atomic_read(&ncm->notify_count)) return; event = req->buf; switch (ncm->notify_state) { case NCM_NOTIFY_NONE: return; case NCM_NOTIFY_CONNECT: event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION; if (ncm->is_open) event->wValue = cpu_to_le16(1); else event->wValue = cpu_to_le16(0); event->wLength = 0; req->length = sizeof *event; DBG(cdev, "notify connect %s\n", ncm->is_open ? "true" : "false"); ncm->notify_state = NCM_NOTIFY_NONE; break; case NCM_NOTIFY_SPEED: event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE; event->wValue = cpu_to_le16(0); event->wLength = cpu_to_le16(8); req->length = NCM_STATUS_BYTECOUNT; /* SPEED_CHANGE data is up/down speeds in bits/sec */ data = req->buf + sizeof *event; data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget)); data[1] = data[0]; DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget)); ncm->notify_state = NCM_NOTIFY_CONNECT; break; } event->bmRequestType = 0xA1; event->wIndex = cpu_to_le16(ncm->ctrl_id); atomic_inc(&ncm->notify_count); /* * In double buffering if there is a space in FIFO, * completion callback can be called right after the call, * so unlocking */ spin_unlock(&ncm->lock); status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC); spin_lock(&ncm->lock); if (status < 0) { atomic_dec(&ncm->notify_count); DBG(cdev, "notify --> %d\n", status); } } /* * Context: ncm->lock held */ static void ncm_notify(struct f_ncm *ncm) { /* * NOTE on most versions of Linux, host side cdc-ethernet * won't listen for notifications until its netdevice opens. * The first notification then sits in the FIFO for a long * time, and the second one is queued. * * If ncm_notify() is called before the second (CONNECT) * notification is sent, then it will reset to send the SPEED * notificaion again (and again, and again), but it's not a problem */ ncm->notify_state = NCM_NOTIFY_SPEED; ncm_do_notify(ncm); } static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req) { struct f_ncm *ncm = req->context; struct usb_composite_dev *cdev = ncm->port.func.config->cdev; struct usb_cdc_notification *event = req->buf; spin_lock(&ncm->lock); switch (req->status) { case 0: VDBG(cdev, "Notification %02x sent\n", event->bNotificationType); atomic_dec(&ncm->notify_count); break; case -ECONNRESET: case -ESHUTDOWN: atomic_set(&ncm->notify_count, 0); ncm->notify_state = NCM_NOTIFY_NONE; break; default: DBG(cdev, "event %02x --> %d\n", event->bNotificationType, req->status); atomic_dec(&ncm->notify_count); break; } ncm_do_notify(ncm); spin_unlock(&ncm->lock); } static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req) { /* now for SET_NTB_INPUT_SIZE only */ unsigned in_size; struct usb_function *f = req->context; struct f_ncm *ncm = func_to_ncm(f); struct usb_composite_dev *cdev = f->config->cdev; req->context = NULL; if (req->status || req->actual != req->length) { DBG(cdev, "Bad control-OUT transfer\n"); goto invalid; } in_size = get_unaligned_le32(req->buf); if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE || in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) { DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size); goto invalid; } ncm->port.fixed_in_len = in_size; VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size); return; invalid: usb_ep_set_halt(ep); return; } static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct f_ncm *ncm = func_to_ncm(f); struct usb_composite_dev *cdev = f->config->cdev; struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; u16 w_index = le16_to_cpu(ctrl->wIndex); u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); /* * composite driver infrastructure handles everything except * CDC class messages; interface activation uses set_alt(). */ switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_SET_ETHERNET_PACKET_FILTER: /* * see 6.2.30: no data, wIndex = interface, * wValue = packet filter bitmap */ if (w_length != 0 || w_index != ncm->ctrl_id) goto invalid; DBG(cdev, "packet filter %02x\n", w_value); /* * REVISIT locking of cdc_filter. This assumes the UDC * driver won't have a concurrent packet TX irq running on * another CPU; or that if it does, this write is atomic... */ ncm->port.cdc_filter = w_value; value = 0; break; /* * and optionally: * case USB_CDC_SEND_ENCAPSULATED_COMMAND: * case USB_CDC_GET_ENCAPSULATED_RESPONSE: * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS: * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER: * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER: * case USB_CDC_GET_ETHERNET_STATISTIC: */ case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_GET_NTB_PARAMETERS: if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id) goto invalid; value = w_length > sizeof ntb_parameters ? sizeof ntb_parameters : w_length; memcpy(req->buf, &ntb_parameters, value); VDBG(cdev, "Host asked NTB parameters\n"); break; case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_GET_NTB_INPUT_SIZE: if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id) goto invalid; put_unaligned_le32(ncm->port.fixed_in_len, req->buf); value = 4; VDBG(cdev, "Host asked INPUT SIZE, sending %d\n", ncm->port.fixed_in_len); break; case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_SET_NTB_INPUT_SIZE: { if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id) goto invalid; req->complete = ncm_ep0out_complete; req->length = w_length; req->context = f; value = req->length; break; } case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_GET_NTB_FORMAT: { uint16_t format; if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id) goto invalid; format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001; put_unaligned_le16(format, req->buf); value = 2; VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format); break; } case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_SET_NTB_FORMAT: { if (w_length != 0 || w_index != ncm->ctrl_id) goto invalid; switch (w_value) { case 0x0000: ncm->parser_opts = &ndp16_opts; DBG(cdev, "NCM16 selected\n"); break; case 0x0001: ncm->parser_opts = &ndp32_opts; DBG(cdev, "NCM32 selected\n"); break; default: goto invalid; } value = 0; break; } case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_GET_CRC_MODE: { uint16_t is_crc; if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id) goto invalid; is_crc = ncm->is_crc ? 0x0001 : 0x0000; put_unaligned_le16(is_crc, req->buf); value = 2; VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc); break; } case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) | USB_CDC_SET_CRC_MODE: { int ndp_hdr_crc = 0; if (w_length != 0 || w_index != ncm->ctrl_id) goto invalid; switch (w_value) { case 0x0000: ncm->is_crc = false; ndp_hdr_crc = NCM_NDP_HDR_NOCRC; DBG(cdev, "non-CRC mode selected\n"); break; case 0x0001: ncm->is_crc = true; ndp_hdr_crc = NCM_NDP_HDR_CRC; DBG(cdev, "CRC mode selected\n"); break; default: goto invalid; } ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc; value = 0; break; } /* and disabled in ncm descriptor: */ /* case USB_CDC_GET_NET_ADDRESS: */ /* case USB_CDC_SET_NET_ADDRESS: */ /* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */ /* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */ default: invalid: DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); } /* respond with data transfer or status phase? */ if (value >= 0) { DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n", ctrl->bRequestType, ctrl->bRequest, w_value, w_index, w_length); req->zero = 0; req->length = value; value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); if (value < 0) ERROR(cdev, "ncm req %02x.%02x response err %d\n", ctrl->bRequestType, ctrl->bRequest, value); } /* device either stalls (value < 0) or reports success */ return value; } static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) { struct f_ncm *ncm = func_to_ncm(f); struct usb_composite_dev *cdev = f->config->cdev; /* Control interface has only altsetting 0 */ if (intf == ncm->ctrl_id) { if (alt != 0) goto fail; DBG(cdev, "reset ncm control %d\n", intf); usb_ep_disable(ncm->notify); if (!(ncm->notify->desc)) { DBG(cdev, "init ncm ctrl %d\n", intf); if (config_ep_by_speed(cdev->gadget, f, ncm->notify)) goto fail; } usb_ep_enable(ncm->notify); /* Data interface has two altsettings, 0 and 1 */ } else if (intf == ncm->data_id) { if (alt > 1) goto fail; if (ncm->port.in_ep->enabled) { DBG(cdev, "reset ncm\n"); ncm->timer_stopping = true; ncm->netdev = NULL; gether_disconnect(&ncm->port); ncm_reset_values(ncm); } /* * CDC Network only sends data in non-default altsettings. * Changing altsettings resets filters, statistics, etc. */ if (alt == 1) { struct net_device *net; if (!ncm->port.in_ep->desc || !ncm->port.out_ep->desc) { DBG(cdev, "init ncm\n"); if (config_ep_by_speed(cdev->gadget, f, ncm->port.in_ep) || config_ep_by_speed(cdev->gadget, f, ncm->port.out_ep)) { ncm->port.in_ep->desc = NULL; ncm->port.out_ep->desc = NULL; goto fail; } } /* TODO */ /* Enable zlps by default for NCM conformance; * override for musb_hdrc (avoids txdma ovhead) */ ncm->port.is_zlp_ok = gadget_is_zlp_supported(cdev->gadget); ncm->port.cdc_filter = DEFAULT_FILTER; DBG(cdev, "activate ncm\n"); net = gether_connect(&ncm->port); if (IS_ERR(net)) return PTR_ERR(net); ncm->netdev = net; ncm->timer_stopping = false; } spin_lock(&ncm->lock); ncm_notify(ncm); spin_unlock(&ncm->lock); } else goto fail; return 0; fail: return -EINVAL; } /* * Because the data interface supports multiple altsettings, * this NCM function *MUST* implement a get_alt() method. */ static int ncm_get_alt(struct usb_function *f, unsigned intf) { struct f_ncm *ncm = func_to_ncm(f); if (intf == ncm->ctrl_id) return 0; return ncm->port.in_ep->enabled ? 1 : 0; } static struct sk_buff *package_for_tx(struct f_ncm *ncm) { __le16 *ntb_iter; struct sk_buff *skb2 = NULL; unsigned ndp_pad; unsigned ndp_index; unsigned new_len; const struct ndp_parser_opts *opts = ncm->parser_opts; const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment); const int dgram_idx_len = 2 * 2 * opts->dgram_item_len; /* Stop the timer */ hrtimer_try_to_cancel(&ncm->task_timer); ndp_pad = ALIGN(ncm->skb_tx_data->len, ndp_align) - ncm->skb_tx_data->len; ndp_index = ncm->skb_tx_data->len + ndp_pad; new_len = ndp_index + dgram_idx_len + ncm->skb_tx_ndp->len; /* Set the final BlockLength and wNdpIndex */ ntb_iter = (void *) ncm->skb_tx_data->data; /* Increment pointer to BlockLength */ ntb_iter += 2 + 1 + 1; put_ncm(&ntb_iter, opts->block_length, new_len); put_ncm(&ntb_iter, opts->ndp_index, ndp_index); /* Set the final NDP wLength */ new_len = opts->ndp_size + (ncm->ndp_dgram_count * dgram_idx_len); ncm->ndp_dgram_count = 0; /* Increment from start to wLength */ ntb_iter = (void *) ncm->skb_tx_ndp->data; ntb_iter += 2; put_unaligned_le16(new_len, ntb_iter); /* Merge the skbs */ swap(skb2, ncm->skb_tx_data); if (ncm->skb_tx_data) { dev_kfree_skb_any(ncm->skb_tx_data); ncm->skb_tx_data = NULL; } /* Insert NDP alignment. */ ntb_iter = (void *) skb_put(skb2, ndp_pad); memset(ntb_iter, 0, ndp_pad); /* Copy NTB across. */ ntb_iter = (void *) skb_put(skb2, ncm->skb_tx_ndp->len); memcpy(ntb_iter, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len); dev_kfree_skb_any(ncm->skb_tx_ndp); ncm->skb_tx_ndp = NULL; /* Insert zero'd datagram. */ ntb_iter = (void *) skb_put(skb2, dgram_idx_len); memset(ntb_iter, 0, dgram_idx_len); return skb2; } static struct sk_buff *ncm_wrap_ntb(struct gether *port, struct sk_buff *skb) { struct f_ncm *ncm = func_to_ncm(&port->func); struct sk_buff *skb2 = NULL; int ncb_len = 0; __le16 *ntb_data; __le16 *ntb_ndp; int dgram_pad; unsigned max_size = ncm->port.fixed_in_len; const struct ndp_parser_opts *opts = ncm->parser_opts; const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment); const int div = le16_to_cpu(ntb_parameters.wNdpInDivisor); const int rem = le16_to_cpu(ntb_parameters.wNdpInPayloadRemainder); const int dgram_idx_len = 2 * 2 * opts->dgram_item_len; if (!skb && !ncm->skb_tx_data) return NULL; if (skb) { /* Add the CRC if required up front */ if (ncm->is_crc) { uint32_t crc; __le16 *crc_pos; crc = ~crc32_le(~0, skb->data, skb->len); crc_pos = (void *) skb_put(skb, sizeof(uint32_t)); put_unaligned_le32(crc, crc_pos); } /* If the new skb is too big for the current NCM NTB then * set the current stored skb to be sent now and clear it * ready for new data. * NOTE: Assume maximum align for speed of calculation. */ if (ncm->skb_tx_data && (ncm->ndp_dgram_count >= TX_MAX_NUM_DPE || (ncm->skb_tx_data->len + div + rem + skb->len + ncm->skb_tx_ndp->len + ndp_align + (2 * dgram_idx_len)) > max_size)) { skb2 = package_for_tx(ncm); if (!skb2) goto err; } if (!ncm->skb_tx_data) { ncb_len = opts->nth_size; dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len; ncb_len += dgram_pad; /* Create a new skb for the NTH and datagrams. */ ncm->skb_tx_data = alloc_skb(max_size, GFP_ATOMIC); if (!ncm->skb_tx_data) goto err; ntb_data = (void *) skb_put(ncm->skb_tx_data, ncb_len); memset(ntb_data, 0, ncb_len); /* dwSignature */ put_unaligned_le32(opts->nth_sign, ntb_data); ntb_data += 2; /* wHeaderLength */ put_unaligned_le16(opts->nth_size, ntb_data++); /* Allocate an skb for storing the NDP, * TX_MAX_NUM_DPE should easily suffice for a * 16k packet. */ ncm->skb_tx_ndp = alloc_skb((int)(opts->ndp_size + opts->dpe_size * TX_MAX_NUM_DPE), GFP_ATOMIC); if (!ncm->skb_tx_ndp) goto err; ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp, opts->ndp_size); memset(ntb_ndp, 0, ncb_len); /* dwSignature */ put_unaligned_le32(ncm->ndp_sign, ntb_ndp); ntb_ndp += 2; /* There is always a zeroed entry */ ncm->ndp_dgram_count = 1; /* Note: we skip opts->next_ndp_index */ } /* Delay the timer. */ hrtimer_start(&ncm->task_timer, ktime_set(0, TX_TIMEOUT_NSECS), HRTIMER_MODE_REL); /* Add the datagram position entries */ ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp, dgram_idx_len); memset(ntb_ndp, 0, dgram_idx_len); ncb_len = ncm->skb_tx_data->len; dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len; ncb_len += dgram_pad; /* (d)wDatagramIndex */ put_ncm(&ntb_ndp, opts->dgram_item_len, ncb_len); /* (d)wDatagramLength */ put_ncm(&ntb_ndp, opts->dgram_item_len, skb->len); ncm->ndp_dgram_count++; /* Add the new data to the skb */ ntb_data = (void *) skb_put(ncm->skb_tx_data, dgram_pad); memset(ntb_data, 0, dgram_pad); ntb_data = (void *) skb_put(ncm->skb_tx_data, skb->len); memcpy(ntb_data, skb->data, skb->len); dev_kfree_skb_any(skb); skb = NULL; } else if (ncm->skb_tx_data && ncm->timer_force_tx) { /* If the tx was requested because of a timeout then send */ skb2 = package_for_tx(ncm); if (!skb2) goto err; } return skb2; err: ncm->netdev->stats.tx_dropped++; if (skb) dev_kfree_skb_any(skb); if (ncm->skb_tx_data) dev_kfree_skb_any(ncm->skb_tx_data); if (ncm->skb_tx_ndp) dev_kfree_skb_any(ncm->skb_tx_ndp); return NULL; } /* * This transmits the NTB if there are frames waiting. */ static void ncm_tx_tasklet(unsigned long data) { struct f_ncm *ncm = (void *)data; if (ncm->timer_stopping) return; /* Only send if data is available. */ if (ncm->skb_tx_data) { ncm->timer_force_tx = true; /* XXX This allowance of a NULL skb argument to ndo_start_xmit * XXX is not sane. The gadget layer should be redesigned so * XXX that the dev->wrap() invocations to build SKBs is transparent * XXX and performed in some way outside of the ndo_start_xmit * XXX interface. */ ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev); ncm->timer_force_tx = false; } } /* * The transmit should only be run if no skb data has been sent * for a certain duration. */ static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data) { struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer); tasklet_schedule(&ncm->tx_tasklet); return HRTIMER_NORESTART; } static int ncm_unwrap_ntb(struct gether *port, struct sk_buff *skb, struct sk_buff_head *list) { struct f_ncm *ncm = func_to_ncm(&port->func); __le16 *tmp = (void *) skb->data; unsigned index, index2; int ndp_index; unsigned dg_len, dg_len2; unsigned ndp_len; struct sk_buff *skb2; int ret = -EINVAL; unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize); const struct ndp_parser_opts *opts = ncm->parser_opts; unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0; int dgram_counter; /* dwSignature */ if (get_unaligned_le32(tmp) != opts->nth_sign) { INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n", skb->len); print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1, skb->data, 32, false); goto err; } tmp += 2; /* wHeaderLength */ if (get_unaligned_le16(tmp++) != opts->nth_size) { INFO(port->func.config->cdev, "Wrong NTB headersize\n"); goto err; } tmp++; /* skip wSequence */ /* (d)wBlockLength */ if (get_ncm(&tmp, opts->block_length) > max_size) { INFO(port->func.config->cdev, "OUT size exceeded\n"); goto err; } ndp_index = get_ncm(&tmp, opts->ndp_index); /* Run through all the NDP's in the NTB */ do { /* NCM 3.2 */ if (((ndp_index % 4) != 0) && (ndp_index < opts->nth_size)) { INFO(port->func.config->cdev, "Bad index: %#X\n", ndp_index); goto err; } /* walk through NDP */ tmp = (void *)(skb->data + ndp_index); if (get_unaligned_le32(tmp) != ncm->ndp_sign) { INFO(port->func.config->cdev, "Wrong NDP SIGN\n"); goto err; } tmp += 2; ndp_len = get_unaligned_le16(tmp++); /* * NCM 3.3.1 * entry is 2 items * item size is 16/32 bits, opts->dgram_item_len * 2 bytes * minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry * Each entry is a dgram index and a dgram length. */ if ((ndp_len < opts->ndp_size + 2 * 2 * (opts->dgram_item_len * 2)) || (ndp_len % opts->ndplen_align != 0)) { INFO(port->func.config->cdev, "Bad NDP length: %#X\n", ndp_len); goto err; } tmp += opts->reserved1; /* Check for another NDP (d)wNextNdpIndex */ ndp_index = get_ncm(&tmp, opts->next_ndp_index); tmp += opts->reserved2; ndp_len -= opts->ndp_size; index2 = get_ncm(&tmp, opts->dgram_item_len); dg_len2 = get_ncm(&tmp, opts->dgram_item_len); dgram_counter = 0; do { index = index2; dg_len = dg_len2; if (dg_len < 14 + crc_len) { /* ethernet hdr + crc */ INFO(port->func.config->cdev, "Bad dgram length: %#X\n", dg_len); goto err; } if (ncm->is_crc) { uint32_t crc, crc2; crc = get_unaligned_le32(skb->data + index + dg_len - crc_len); crc2 = ~crc32_le(~0, skb->data + index, dg_len - crc_len); if (crc != crc2) { INFO(port->func.config->cdev, "Bad CRC\n"); goto err; } } index2 = get_ncm(&tmp, opts->dgram_item_len); dg_len2 = get_ncm(&tmp, opts->dgram_item_len); /* * Copy the data into a new skb. * This ensures the truesize is correct */ skb2 = netdev_alloc_skb_ip_align(ncm->netdev, dg_len - crc_len); if (skb2 == NULL) goto err; memcpy(skb_put(skb2, dg_len - crc_len), skb->data + index, dg_len - crc_len); skb_queue_tail(list, skb2); ndp_len -= 2 * (opts->dgram_item_len * 2); dgram_counter++; if (index2 == 0 || dg_len2 == 0) break; } while (ndp_len > 2 * (opts->dgram_item_len * 2)); } while (ndp_index); dev_kfree_skb_any(skb); VDBG(port->func.config->cdev, "Parsed NTB with %d frames\n", dgram_counter); return 0; err: skb_queue_purge(list); dev_kfree_skb_any(skb); return ret; } static void ncm_disable(struct usb_function *f) { struct f_ncm *ncm = func_to_ncm(f); struct usb_composite_dev *cdev = f->config->cdev; DBG(cdev, "ncm deactivated\n"); if (ncm->port.in_ep->enabled) { ncm->timer_stopping = true; ncm->netdev = NULL; gether_disconnect(&ncm->port); } if (ncm->notify->enabled) { usb_ep_disable(ncm->notify); ncm->notify->desc = NULL; } } /*-------------------------------------------------------------------------*/ /* * Callbacks let us notify the host about connect/disconnect when the * net device is opened or closed. * * For testing, note that link states on this side include both opened * and closed variants of: * * - disconnected/unconfigured * - configured but inactive (data alt 0) * - configured and active (data alt 1) * * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and * SET_INTERFACE (altsetting). Remember also that "configured" doesn't * imply the host is actually polling the notification endpoint, and * likewise that "active" doesn't imply it's actually using the data * endpoints for traffic. */ static void ncm_open(struct gether *geth) { struct f_ncm *ncm = func_to_ncm(&geth->func); DBG(ncm->port.func.config->cdev, "%s\n", __func__); spin_lock(&ncm->lock); ncm->is_open = true; ncm_notify(ncm); spin_unlock(&ncm->lock); } static void ncm_close(struct gether *geth) { struct f_ncm *ncm = func_to_ncm(&geth->func); DBG(ncm->port.func.config->cdev, "%s\n", __func__); spin_lock(&ncm->lock); ncm->is_open = false; ncm_notify(ncm); spin_unlock(&ncm->lock); } /*-------------------------------------------------------------------------*/ /* ethernet function driver setup/binding */ static int ncm_bind(struct usb_configuration *c, struct usb_function *f) { struct usb_composite_dev *cdev = c->cdev; struct f_ncm *ncm = func_to_ncm(f); struct usb_string *us; int status; struct usb_ep *ep; struct f_ncm_opts *ncm_opts; if (!can_support_ecm(cdev->gadget)) return -EINVAL; ncm_opts = container_of(f->fi, struct f_ncm_opts, func_inst); /* * in drivers/usb/gadget/configfs.c:configfs_composite_bind() * configurations are bound in sequence with list_for_each_entry, * in each configuration its functions are bound in sequence * with list_for_each_entry, so we assume no race condition * with regard to ncm_opts->bound access */ if (!ncm_opts->bound) { mutex_lock(&ncm_opts->lock); gether_set_gadget(ncm_opts->net, cdev->gadget); status = gether_register_netdev(ncm_opts->net); mutex_unlock(&ncm_opts->lock); if (status) return status; ncm_opts->bound = true; } us = usb_gstrings_attach(cdev, ncm_strings, ARRAY_SIZE(ncm_string_defs)); if (IS_ERR(us)) return PTR_ERR(us); ncm_control_intf.iInterface = us[STRING_CTRL_IDX].id; ncm_data_nop_intf.iInterface = us[STRING_DATA_IDX].id; ncm_data_intf.iInterface = us[STRING_DATA_IDX].id; ecm_desc.iMACAddress = us[STRING_MAC_IDX].id; ncm_iad_desc.iFunction = us[STRING_IAD_IDX].id; /* allocate instance-specific interface IDs */ status = usb_interface_id(c, f); if (status < 0) goto fail; ncm->ctrl_id = status; ncm_iad_desc.bFirstInterface = status; ncm_control_intf.bInterfaceNumber = status; ncm_union_desc.bMasterInterface0 = status; status = usb_interface_id(c, f); if (status < 0) goto fail; ncm->data_id = status; ncm_data_nop_intf.bInterfaceNumber = status; ncm_data_intf.bInterfaceNumber = status; ncm_union_desc.bSlaveInterface0 = status; status = -ENODEV; /* allocate instance-specific endpoints */ ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc); if (!ep) goto fail; ncm->port.in_ep = ep; ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc); if (!ep) goto fail; ncm->port.out_ep = ep; ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc); if (!ep) goto fail; ncm->notify = ep; status = -ENOMEM; /* allocate notification request and buffer */ ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); if (!ncm->notify_req) goto fail; ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL); if (!ncm->notify_req->buf) goto fail; ncm->notify_req->context = ncm; ncm->notify_req->complete = ncm_notify_complete; /* * support all relevant hardware speeds... we expect that when * hardware is dual speed, all bulk-capable endpoints work at * both speeds */ hs_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress; hs_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress; hs_ncm_notify_desc.bEndpointAddress = fs_ncm_notify_desc.bEndpointAddress; status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function, NULL); if (status) goto fail; /* * NOTE: all that is done without knowing or caring about * the network link ... which is unavailable to this code * until we're activated via set_alt(). */ ncm->port.open = ncm_open; ncm->port.close = ncm_close; tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm); hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); ncm->task_timer.function = ncm_tx_timeout; DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n", gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", ncm->port.in_ep->name, ncm->port.out_ep->name, ncm->notify->name); return 0; fail: if (ncm->notify_req) { kfree(ncm->notify_req->buf); usb_ep_free_request(ncm->notify, ncm->notify_req); } ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); return status; } static inline struct f_ncm_opts *to_f_ncm_opts(struct config_item *item) { return container_of(to_config_group(item), struct f_ncm_opts, func_inst.group); } /* f_ncm_item_ops */ USB_ETHERNET_CONFIGFS_ITEM(ncm); /* f_ncm_opts_dev_addr */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(ncm); /* f_ncm_opts_host_addr */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(ncm); /* f_ncm_opts_qmult */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(ncm); /* f_ncm_opts_ifname */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ncm); static struct configfs_attribute *ncm_attrs[] = { &ncm_opts_attr_dev_addr, &ncm_opts_attr_host_addr, &ncm_opts_attr_qmult, &ncm_opts_attr_ifname, NULL, }; static struct config_item_type ncm_func_type = { .ct_item_ops = &ncm_item_ops, .ct_attrs = ncm_attrs, .ct_owner = THIS_MODULE, }; static void ncm_free_inst(struct usb_function_instance *f) { struct f_ncm_opts *opts; opts = container_of(f, struct f_ncm_opts, func_inst); if (opts->bound) gether_cleanup(netdev_priv(opts->net)); else free_netdev(opts->net); kfree(opts); } static struct usb_function_instance *ncm_alloc_inst(void) { struct f_ncm_opts *opts; opts = kzalloc(sizeof(*opts), GFP_KERNEL); if (!opts) return ERR_PTR(-ENOMEM); mutex_init(&opts->lock); opts->func_inst.free_func_inst = ncm_free_inst; opts->net = gether_setup_default(); if (IS_ERR(opts->net)) { struct net_device *net = opts->net; kfree(opts); return ERR_CAST(net); } config_group_init_type_name(&opts->func_inst.group, "", &ncm_func_type); return &opts->func_inst; } static void ncm_free(struct usb_function *f) { struct f_ncm *ncm; struct f_ncm_opts *opts; ncm = func_to_ncm(f); opts = container_of(f->fi, struct f_ncm_opts, func_inst); kfree(ncm); mutex_lock(&opts->lock); opts->refcnt--; mutex_unlock(&opts->lock); } static void ncm_unbind(struct usb_configuration *c, struct usb_function *f) { struct f_ncm *ncm = func_to_ncm(f); DBG(c->cdev, "ncm unbind\n"); hrtimer_cancel(&ncm->task_timer); tasklet_kill(&ncm->tx_tasklet); ncm_string_defs[0].id = 0; usb_free_all_descriptors(f); if (atomic_read(&ncm->notify_count)) { usb_ep_dequeue(ncm->notify, ncm->notify_req); atomic_set(&ncm->notify_count, 0); } kfree(ncm->notify_req->buf); usb_ep_free_request(ncm->notify, ncm->notify_req); } static struct usb_function *ncm_alloc(struct usb_function_instance *fi) { struct f_ncm *ncm; struct f_ncm_opts *opts; int status; /* allocate and initialize one new instance */ ncm = kzalloc(sizeof(*ncm), GFP_KERNEL); if (!ncm) return ERR_PTR(-ENOMEM); opts = container_of(fi, struct f_ncm_opts, func_inst); mutex_lock(&opts->lock); opts->refcnt++; /* export host's Ethernet address in CDC format */ status = gether_get_host_addr_cdc(opts->net, ncm->ethaddr, sizeof(ncm->ethaddr)); if (status < 12) { /* strlen("01234567890a") */ kfree(ncm); mutex_unlock(&opts->lock); return ERR_PTR(-EINVAL); } ncm_string_defs[STRING_MAC_IDX].s = ncm->ethaddr; spin_lock_init(&ncm->lock); ncm_reset_values(ncm); ncm->port.ioport = netdev_priv(opts->net); mutex_unlock(&opts->lock); ncm->port.is_fixed = true; ncm->port.supports_multi_frame = true; ncm->port.func.name = "cdc_network"; /* descriptors are per-instance copies */ ncm->port.func.bind = ncm_bind; ncm->port.func.unbind = ncm_unbind; ncm->port.func.set_alt = ncm_set_alt; ncm->port.func.get_alt = ncm_get_alt; ncm->port.func.setup = ncm_setup; ncm->port.func.disable = ncm_disable; ncm->port.func.free_func = ncm_free; ncm->port.wrap = ncm_wrap_ntb; ncm->port.unwrap = ncm_unwrap_ntb; return &ncm->port.func; } DECLARE_USB_FUNCTION_INIT(ncm, ncm_alloc_inst, ncm_alloc); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Yauheni Kaliuta");