linux/drivers/usb/gadget/f_ncm.c
Sebastian Andrzej Siewior 10287baec7 usb: gadget: always update HS/SS descriptors and create a copy of them
HS and SS descriptors are staticaly created. They are updated during the
bind process with the endpoint address, string id or interface numbers.

After that, the descriptor chain is linked to struct usb_function which
is used by composite in order to serve the GET_DESCRIPTOR requests,
number of available configs and so on.

There is no need to assign the HS descriptor only if the UDC supports
HS speed because composite won't report those to the host if HS support
has not been reached. The same reasoning is valid for SS.

This patch makes sure each function updates HS/SS descriptors
unconditionally and uses the newly introduced helper function to create a
copy the descriptors for the speed which is supported by the UDC.

While at that, also rename f->descriptors to f->fs_descriptors in order
to make it more explicit what that means.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-10-31 15:09:44 +02:00

1360 lines
36 KiB
C

/*
* 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 NCM_STATUS_INTERVAL_MS 32
#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 = NCM_STATUS_INTERVAL_MS,
};
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 = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS),
};
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;
/*
* 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);
/*
* 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:
usb_free_all_descriptors(f);
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)
ncm->port.out_ep->driver_data = NULL;
if (ncm->port.in_ep)
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");
usb_free_all_descriptors(f);
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, "%pm", ethaddr);
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;
}