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linux/drivers/usb/gadget/f_ncm.c

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/*
* 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
*
* 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 <linux/kernel.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <linux/usb/cdc.h>
#include "u_ether.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;
bool is_open;
struct ndp_parser_opts *parser_opts;
bool is_crc;
/*
* for notification, it is accessed from both
* callback and ethernet open/close
*/
spinlock_t lock;
};
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 USB_CDC_NCM_NTB_MIN_IN_SIZE
#define NTB_OUT_SIZE 16384
/*
* skbs of size less than that will not be aligned
* to NCM's dwNtbInMaxSize to save bus bandwidth
*/
#define MAX_TX_NONFIXED (512 * 3)
#define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \
USB_CDC_NCM_NTB32_SUPPORTED)
static struct usb_cdc_ncm_ntb_parameters ntb_parameters = {
.wLength = 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 LOG2_STATUS_INTERVAL_MSEC 5 /* 1 << 5 == 32 msec */
#define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
static struct usb_interface_assoc_descriptor ncm_iad_desc __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 __initdata = {
.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 = 1 << LOG2_STATUS_INTERVAL_MSEC,
};
static struct usb_endpoint_descriptor fs_ncm_in_desc __initdata = {
.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 __initdata = {
.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[] __initdata = {
(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 __initdata = {
.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 = LOG2_STATUS_INTERVAL_MSEC + 4,
};
static struct usb_endpoint_descriptor hs_ncm_in_desc __initdata = {
.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 __initdata = {
.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[] __initdata = {
(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 = NULL /* DYNAMIC */,
[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 ndplen_align;
/* sizes in u16 units */
unsigned dgram_item_len; /* index or length */
unsigned block_length;
unsigned fp_index;
unsigned reserved1;
unsigned reserved2;
unsigned next_fp_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), \
.ndplen_align = 4, \
.dgram_item_len = 1, \
.block_length = 1, \
.fp_index = 1, \
.reserved1 = 0, \
.reserved2 = 0, \
.next_fp_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), \
.ndplen_align = 8, \
.dgram_item_len = 2, \
.block_length = 2, \
.fp_index = 2, \
.reserved1 = 1, \
.reserved2 = 2, \
.next_fp_index = 2, \
}
static struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
static 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 (!req)
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);
ncm->notify_req = NULL;
/*
* 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) {
ncm->notify_req = req;
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);
break;
case -ECONNRESET:
case -ESHUTDOWN:
ncm->notify_state = NCM_NOTIFY_NONE;
break;
default:
DBG(cdev, "event %02x --> %d\n",
event->bNotificationType, req->status);
break;
}
ncm->notify_req = req;
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 = ep->driver_data;
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->parser_opts->ndp_sign &= ~NCM_NDP_HDR_CRC_MASK;
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;
if (ncm->notify->driver_data) {
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);
ncm->notify->driver_data = ncm;
/* Data interface has two altsettings, 0 and 1 */
} else if (intf == ncm->data_id) {
if (alt > 1)
goto fail;
if (ncm->port.in_ep->driver_data) {
DBG(cdev, "reset ncm\n");
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_musbhdrc(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);
}
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->driver_data ? 1 : 0;
}
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;
int ncb_len = 0;
__le16 *tmp;
int div = ntb_parameters.wNdpInDivisor;
int rem = ntb_parameters.wNdpInPayloadRemainder;
int pad;
int ndp_align = ntb_parameters.wNdpInAlignment;
int ndp_pad;
unsigned max_size = ncm->port.fixed_in_len;
struct ndp_parser_opts *opts = ncm->parser_opts;
unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
ncb_len += opts->nth_size;
ndp_pad = ALIGN(ncb_len, ndp_align) - ncb_len;
ncb_len += ndp_pad;
ncb_len += opts->ndp_size;
ncb_len += 2 * 2 * opts->dgram_item_len; /* Datagram entry */
ncb_len += 2 * 2 * opts->dgram_item_len; /* Zero datagram entry */
pad = ALIGN(ncb_len, div) + rem - ncb_len;
ncb_len += pad;
if (ncb_len + skb->len + crc_len > max_size) {
dev_kfree_skb_any(skb);
return NULL;
}
skb2 = skb_copy_expand(skb, ncb_len,
max_size - skb->len - ncb_len - crc_len,
GFP_ATOMIC);
dev_kfree_skb_any(skb);
if (!skb2)
return NULL;
skb = skb2;
tmp = (void *) skb_push(skb, ncb_len);
memset(tmp, 0, ncb_len);
put_unaligned_le32(opts->nth_sign, tmp); /* dwSignature */
tmp += 2;
/* wHeaderLength */
put_unaligned_le16(opts->nth_size, tmp++);
tmp++; /* skip wSequence */
put_ncm(&tmp, opts->block_length, skb->len); /* (d)wBlockLength */
/* (d)wFpIndex */
/* the first pointer is right after the NTH + align */
put_ncm(&tmp, opts->fp_index, opts->nth_size + ndp_pad);
tmp = (void *)tmp + ndp_pad;
/* NDP */
put_unaligned_le32(opts->ndp_sign, tmp); /* dwSignature */
tmp += 2;
/* wLength */
put_unaligned_le16(ncb_len - opts->nth_size - pad, tmp++);
tmp += opts->reserved1;
tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
tmp += opts->reserved2;
if (ncm->is_crc) {
uint32_t crc;
crc = ~crc32_le(~0,
skb->data + ncb_len,
skb->len - ncb_len);
put_unaligned_le32(crc, skb->data + skb->len);
skb_put(skb, crc_len);
}
/* (d)wDatagramIndex[0] */
put_ncm(&tmp, opts->dgram_item_len, ncb_len);
/* (d)wDatagramLength[0] */
put_ncm(&tmp, opts->dgram_item_len, skb->len - ncb_len);
/* (d)wDatagramIndex[1] and (d)wDatagramLength[1] already zeroed */
if (skb->len > MAX_TX_NONFIXED)
memset(skb_put(skb, max_size - skb->len),
0, max_size - skb->len);
return skb;
}
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;
unsigned dg_len, dg_len2;
unsigned ndp_len;
struct sk_buff *skb2;
int ret = -EINVAL;
unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
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;
}
index = get_ncm(&tmp, opts->fp_index);
/* NCM 3.2 */
if (((index % 4) != 0) && (index < opts->nth_size)) {
INFO(port->func.config->cdev, "Bad index: %x\n",
index);
goto err;
}
/* walk through NDP */
tmp = ((void *)skb->data) + index;
if (get_unaligned_le32(tmp) != opts->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
*/
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;
tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
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 header + 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);
if (index2 == 0 || dg_len2 == 0) {
skb2 = skb;
} else {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
goto err;
}
if (!skb_pull(skb2, index)) {
ret = -EOVERFLOW;
goto err;
}
skb_trim(skb2, 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)); /* zero entry */
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->driver_data)
gether_disconnect(&ncm->port);
if (ncm->notify->driver_data) {
usb_ep_disable(ncm->notify);
ncm->notify->driver_data = NULL;
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 __init
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);
int status;
struct usb_ep *ep;
/* 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->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
if (!ep)
goto fail;
ncm->port.out_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
if (!ep)
goto fail;
ncm->notify = ep;
ep->driver_data = cdev; /* claim */
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;
/* copy descriptors, and track endpoint copies */
f->descriptors = usb_copy_descriptors(ncm_fs_function);
if (!f->descriptors)
goto fail;
/*
* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
if (gadget_is_dualspeed(c->cdev->gadget)) {
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;
/* copy descriptors, and track endpoint copies */
f->hs_descriptors = usb_copy_descriptors(ncm_hs_function);
if (!f->hs_descriptors)
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;
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 (f->descriptors)
usb_free_descriptors(f->descriptors);
if (ncm->notify_req) {
kfree(ncm->notify_req->buf);
usb_ep_free_request(ncm->notify, ncm->notify_req);
}
/* we might as well release our claims on endpoints */
if (ncm->notify)
ncm->notify->driver_data = NULL;
if (ncm->port.out_ep->desc)
ncm->port.out_ep->driver_data = NULL;
if (ncm->port.in_ep->desc)
ncm->port.in_ep->driver_data = NULL;
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
return status;
}
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");
if (gadget_is_dualspeed(c->cdev->gadget))
usb_free_descriptors(f->hs_descriptors);
usb_free_descriptors(f->descriptors);
kfree(ncm->notify_req->buf);
usb_ep_free_request(ncm->notify, ncm->notify_req);
ncm_string_defs[1].s = NULL;
kfree(ncm);
}
/**
* ncm_bind_config - add CDC Network link to a configuration
* @c: the configuration to support the network link
* @ethaddr: a buffer in which the ethernet address of the host side
* side of the link was recorded
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*
* Caller must have called @gether_setup(). Caller is also responsible
* for calling @gether_cleanup() before module unload.
*/
int __init ncm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
{
struct f_ncm *ncm;
int status;
if (!can_support_ecm(c->cdev->gadget) || !ethaddr)
return -EINVAL;
/* maybe allocate device-global string IDs */
if (ncm_string_defs[0].id == 0) {
/* control interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ncm_string_defs[STRING_CTRL_IDX].id = status;
ncm_control_intf.iInterface = status;
/* data interface label */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ncm_string_defs[STRING_DATA_IDX].id = status;
ncm_data_nop_intf.iInterface = status;
ncm_data_intf.iInterface = status;
/* MAC address */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ncm_string_defs[STRING_MAC_IDX].id = status;
ecm_desc.iMACAddress = status;
/* IAD */
status = usb_string_id(c->cdev);
if (status < 0)
return status;
ncm_string_defs[STRING_IAD_IDX].id = status;
ncm_iad_desc.iFunction = status;
}
/* allocate and initialize one new instance */
ncm = kzalloc(sizeof *ncm, GFP_KERNEL);
if (!ncm)
return -ENOMEM;
/* export host's Ethernet address in CDC format */
snprintf(ncm->ethaddr, sizeof ncm->ethaddr,
"%02X%02X%02X%02X%02X%02X",
ethaddr[0], ethaddr[1], ethaddr[2],
ethaddr[3], ethaddr[4], ethaddr[5]);
ncm_string_defs[1].s = ncm->ethaddr;
spin_lock_init(&ncm->lock);
ncm_reset_values(ncm);
ncm->port.is_fixed = true;
ncm->port.func.name = "cdc_network";
ncm->port.func.strings = ncm_strings;
/* 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.wrap = ncm_wrap_ntb;
ncm->port.unwrap = ncm_unwrap_ntb;
status = usb_add_function(c, &ncm->port.func);
if (status) {
ncm_string_defs[1].s = NULL;
kfree(ncm);
}
return status;
}
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