diff options
Diffstat (limited to 'drivers/usb/gadget/function/f_ncm.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_ncm.c | 1711 |
1 files changed, 1711 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c new file mode 100644 index 000000000..10b4612df --- /dev/null +++ b/drivers/usb/gadget/function/f_ncm.c @@ -0,0 +1,1711 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * f_ncm.c -- USB CDC Network (NCM) link function driver + * + * Copyright (C) 2010 Nokia Corporation + * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com> + * + * The driver borrows from f_ecm.c which is: + * + * Copyright (C) 2003-2005,2008 David Brownell + * Copyright (C) 2008 Nokia Corporation + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/etherdevice.h> +#include <linux/crc32.h> + +#include <linux/usb/cdc.h> + +#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 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_superspeed(g) && g->speed >= USB_SPEED_SUPER_PLUS) + return 4250000000U; + else if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) + return 3750000000U; + else 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, +}; + + +/* super speed support: */ + +static struct usb_endpoint_descriptor ss_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_ss_ep_comp_descriptor ss_ncm_notify_comp_desc = { + .bLength = sizeof(ss_ncm_notify_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /* the following 3 values can be tweaked if necessary */ + /* .bMaxBurst = 0, */ + /* .bmAttributes = 0, */ + .wBytesPerInterval = cpu_to_le16(NCM_STATUS_BYTECOUNT), +}; + +static struct usb_endpoint_descriptor ss_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(1024), +}; + +static struct usb_endpoint_descriptor ss_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(1024), +}; + +static struct usb_ss_ep_comp_descriptor ss_ncm_bulk_comp_desc = { + .bLength = sizeof(ss_ncm_bulk_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /* the following 2 values can be tweaked if necessary */ + /* .bMaxBurst = 0, */ + /* .bmAttributes = 0, */ +}; + +static struct usb_descriptor_header *ncm_ss_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 *) &ss_ncm_notify_desc, + (struct usb_descriptor_header *) &ss_ncm_notify_comp_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 *) &ss_ncm_in_desc, + (struct usb_descriptor_header *) &ss_ncm_bulk_comp_desc, + (struct usb_descriptor_header *) &ss_ncm_out_desc, + (struct usb_descriptor_header *) &ss_ncm_bulk_comp_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 %u\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_consume_skb_any(ncm->skb_tx_data); + ncm->skb_tx_data = NULL; + } + + /* Insert NDP alignment. */ + skb_put_zero(skb2, ndp_pad); + + /* Copy NTB across. */ + skb_put_data(skb2, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len); + dev_consume_skb_any(ncm->skb_tx_ndp); + ncm->skb_tx_ndp = NULL; + + /* Insert zero'd datagram. */ + skb_put_zero(skb2, 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 = 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; + + ncm->skb_tx_data->dev = ncm->netdev; + ntb_data = skb_put_zero(ncm->skb_tx_data, 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; + + ncm->skb_tx_ndp->dev = ncm->netdev; + ntb_ndp = 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 */ + + /* Start the timer. */ + hrtimer_start(&ncm->task_timer, TX_TIMEOUT_NSECS, + HRTIMER_MODE_REL_SOFT); + } + + /* Add the datagram position entries */ + ntb_ndp = skb_put_zero(ncm->skb_tx_ndp, 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 */ + skb_put_zero(ncm->skb_tx_data, dgram_pad); + skb_put_data(ncm->skb_tx_data, skb->data, skb->len); + dev_consume_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; +} + +/* + * 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); + + /* Only send if data is available. */ + if (!ncm->timer_stopping && 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; + } + 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; + unsigned block_len; + struct sk_buff *skb2; + int ret = -EINVAL; + unsigned ntb_max = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize); + unsigned frame_max = le16_to_cpu(ecm_desc.wMaxSegmentSize); + 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 */ + + block_len = get_ncm(&tmp, opts->block_length); + /* (d)wBlockLength */ + if (block_len > ntb_max) { + 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 + * dwNdpIndex + */ + if (((ndp_index % 4) != 0) || + (ndp_index < opts->nth_size) || + (ndp_index > (block_len - + opts->ndp_size))) { + INFO(port->func.config->cdev, "Bad index: %#X\n", + ndp_index); + goto err; + } + + /* + * walk through NDP + * dwSignature + */ + 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 + * wLength + * 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; + /* wDatagramIndex[0] */ + if ((index < opts->nth_size) || + (index > block_len - opts->dpe_size)) { + INFO(port->func.config->cdev, + "Bad index: %#X\n", index); + goto err; + } + + dg_len = dg_len2; + /* + * wDatagramLength[0] + * ethernet hdr + crc or larger than max frame size + */ + if ((dg_len < 14 + crc_len) || + (dg_len > frame_max)) { + 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); + + /* wDatagramIndex[1] */ + if (index2 > block_len - opts->dpe_size) { + INFO(port->func.config->cdev, + "Bad index: %#X\n", index2); + goto err; + } + + /* + * 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; + skb_put_data(skb2, 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_consume_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; + + ss_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress; + ss_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress; + ss_ncm_notify_desc.bEndpointAddress = + fs_ncm_notify_desc.bEndpointAddress; + + status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function, + ncm_ss_function, ncm_ss_function); + 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; + + hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); + ncm->task_timer.function = ncm_tx_timeout; + + DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n", + gadget_is_superspeed(c->cdev->gadget) ? "super" : + 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 const 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); + + 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"); |