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linux/drivers/net/usb/cdc_ncm.c

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/*
* cdc_ncm.c
*
* Copyright (C) ST-Ericsson 2010-2012
* Contact: Alexey Orishko <alexey.orishko@stericsson.com>
* Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
*
* USB Host Driver for Network Control Model (NCM)
* http://www.usb.org/developers/devclass_docs/NCM10.zip
*
* The NCM encoding, decoding and initialization logic
* derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
*
* This software is available to you under a choice of one of two
* licenses. You may choose this file to be licensed under the terms
* of the GNU General Public License (GPL) Version 2 or the 2-clause
* BSD license listed below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ctype.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/usb.h>
#include <linux/hrtimer.h>
#include <linux/atomic.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc.h>
#include <linux/usb/cdc_ncm.h>
#if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
static bool prefer_mbim = true;
#else
static bool prefer_mbim;
#endif
module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
static void cdc_ncm_txpath_bh(unsigned long param);
static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
static struct usb_driver cdc_ncm_driver;
static int cdc_ncm_setup(struct usbnet *dev)
{
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
struct usb_cdc_ncm_ntb_parameters ncm_parm;
u32 val;
u8 flags;
u8 iface_no;
int err;
int eth_hlen;
u16 ntb_fmt_supported;
__le16 max_datagram_size;
iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
USB_TYPE_CLASS | USB_DIR_IN
|USB_RECIP_INTERFACE,
0, iface_no, &ncm_parm,
sizeof(ncm_parm));
if (err < 0) {
dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
return err; /* GET_NTB_PARAMETERS is required */
}
/* read correct set of parameters according to device mode */
ctx->rx_max = le32_to_cpu(ncm_parm.dwNtbInMaxSize);
ctx->tx_max = le32_to_cpu(ncm_parm.dwNtbOutMaxSize);
ctx->tx_remainder = le16_to_cpu(ncm_parm.wNdpOutPayloadRemainder);
ctx->tx_modulus = le16_to_cpu(ncm_parm.wNdpOutDivisor);
ctx->tx_ndp_modulus = le16_to_cpu(ncm_parm.wNdpOutAlignment);
/* devices prior to NCM Errata shall set this field to zero */
ctx->tx_max_datagrams = le16_to_cpu(ncm_parm.wNtbOutMaxDatagrams);
ntb_fmt_supported = le16_to_cpu(ncm_parm.bmNtbFormatsSupported);
/* there are some minor differences in NCM and MBIM defaults */
if (cdc_ncm_comm_intf_is_mbim(ctx->control->cur_altsetting)) {
if (!ctx->mbim_desc)
return -EINVAL;
eth_hlen = 0;
flags = ctx->mbim_desc->bmNetworkCapabilities;
ctx->max_datagram_size = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
if (ctx->max_datagram_size < CDC_MBIM_MIN_DATAGRAM_SIZE)
ctx->max_datagram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
} else {
if (!ctx->func_desc)
return -EINVAL;
eth_hlen = ETH_HLEN;
flags = ctx->func_desc->bmNetworkCapabilities;
ctx->max_datagram_size = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
}
/* common absolute max for NCM and MBIM */
if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE;
dev_dbg(&dev->intf->dev,
"dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
/* max count of tx datagrams */
if ((ctx->tx_max_datagrams == 0) ||
(ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
/* verify maximum size of received NTB in bytes */
if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
dev_dbg(&dev->intf->dev, "Using min receive length=%d\n",
USB_CDC_NCM_NTB_MIN_IN_SIZE);
ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
}
if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
dev_dbg(&dev->intf->dev, "Using default maximum receive length=%d\n",
CDC_NCM_NTB_MAX_SIZE_RX);
ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
}
/* inform device about NTB input size changes */
if (ctx->rx_max != le32_to_cpu(ncm_parm.dwNtbInMaxSize)) {
__le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, &dwNtbInMaxSize, 4);
if (err < 0)
dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
}
/* verify maximum size of transmitted NTB in bytes */
if (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX) {
dev_dbg(&dev->intf->dev, "Using default maximum transmit length=%d\n",
CDC_NCM_NTB_MAX_SIZE_TX);
ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
/* Adding a pad byte here simplifies the handling in
* cdc_ncm_fill_tx_frame, by making tx_max always
* represent the real skb max size.
*/
if (ctx->tx_max % usb_maxpacket(dev->udev, dev->out, 1) == 0)
ctx->tx_max++;
}
/*
* verify that the structure alignment is:
* - power of two
* - not greater than the maximum transmit length
* - not less than four bytes
*/
val = ctx->tx_ndp_modulus;
if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
(val != ((-val) & val)) || (val >= ctx->tx_max)) {
dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
}
/*
* verify that the payload alignment is:
* - power of two
* - not greater than the maximum transmit length
* - not less than four bytes
*/
val = ctx->tx_modulus;
if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
(val != ((-val) & val)) || (val >= ctx->tx_max)) {
dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
}
/* verify the payload remainder */
if (ctx->tx_remainder >= ctx->tx_modulus) {
dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
ctx->tx_remainder = 0;
}
/* adjust TX-remainder according to NCM specification. */
ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
(ctx->tx_modulus - 1));
/* additional configuration */
/* set CRC Mode */
if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
USB_CDC_NCM_CRC_NOT_APPENDED,
iface_no, NULL, 0);
if (err < 0)
dev_dbg(&dev->intf->dev, "Setting CRC mode off failed\n");
}
/* set NTB format, if both formats are supported */
if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
USB_CDC_NCM_NTB16_FORMAT,
iface_no, NULL, 0);
if (err < 0)
dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit failed\n");
}
/* inform the device about the selected Max Datagram Size */
if (!(flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
goto out;
/* read current mtu value from device */
err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
0, iface_no, &max_datagram_size, 2);
if (err < 0) {
dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
goto out;
}
if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
goto out;
max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
0, iface_no, &max_datagram_size, 2);
if (err < 0)
dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
out:
/* set MTU to max supported by the device if necessary */
if (dev->net->mtu > ctx->max_datagram_size - eth_hlen)
dev->net->mtu = ctx->max_datagram_size - eth_hlen;
return 0;
}
static void
cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
{
struct usb_host_endpoint *e, *in = NULL, *out = NULL;
u8 ep;
for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
e = intf->cur_altsetting->endpoint + ep;
switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_INT:
if (usb_endpoint_dir_in(&e->desc)) {
if (!dev->status)
dev->status = e;
}
break;
case USB_ENDPOINT_XFER_BULK:
if (usb_endpoint_dir_in(&e->desc)) {
if (!in)
in = e;
} else {
if (!out)
out = e;
}
break;
default:
break;
}
}
if (in && !dev->in)
dev->in = usb_rcvbulkpipe(dev->udev,
in->desc.bEndpointAddress &
USB_ENDPOINT_NUMBER_MASK);
if (out && !dev->out)
dev->out = usb_sndbulkpipe(dev->udev,
out->desc.bEndpointAddress &
USB_ENDPOINT_NUMBER_MASK);
}
static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
{
if (ctx == NULL)
return;
if (ctx->tx_rem_skb != NULL) {
dev_kfree_skb_any(ctx->tx_rem_skb);
ctx->tx_rem_skb = NULL;
}
if (ctx->tx_curr_skb != NULL) {
dev_kfree_skb_any(ctx->tx_curr_skb);
ctx->tx_curr_skb = NULL;
}
kfree(ctx);
}
int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
{
const struct usb_cdc_union_desc *union_desc = NULL;
struct cdc_ncm_ctx *ctx;
struct usb_driver *driver;
u8 *buf;
int len;
int temp;
u8 iface_no;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
ctx->bh.data = (unsigned long)dev;
ctx->bh.func = cdc_ncm_txpath_bh;
atomic_set(&ctx->stop, 0);
spin_lock_init(&ctx->mtx);
/* store ctx pointer in device data field */
dev->data[0] = (unsigned long)ctx;
/* only the control interface can be successfully probed */
ctx->control = intf;
/* get some pointers */
driver = driver_of(intf);
buf = intf->cur_altsetting->extra;
len = intf->cur_altsetting->extralen;
/* parse through descriptors associated with control interface */
while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
if (buf[1] != USB_DT_CS_INTERFACE)
goto advance;
switch (buf[2]) {
case USB_CDC_UNION_TYPE:
if (buf[0] < sizeof(*union_desc))
break;
union_desc = (const struct usb_cdc_union_desc *)buf;
/* the master must be the interface we are probing */
if (intf->cur_altsetting->desc.bInterfaceNumber !=
union_desc->bMasterInterface0) {
dev_dbg(&intf->dev, "bogus CDC Union\n");
goto error;
}
ctx->data = usb_ifnum_to_if(dev->udev,
union_desc->bSlaveInterface0);
break;
case USB_CDC_ETHERNET_TYPE:
if (buf[0] < sizeof(*(ctx->ether_desc)))
break;
ctx->ether_desc =
(const struct usb_cdc_ether_desc *)buf;
break;
case USB_CDC_NCM_TYPE:
if (buf[0] < sizeof(*(ctx->func_desc)))
break;
ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
break;
case USB_CDC_MBIM_TYPE:
if (buf[0] < sizeof(*(ctx->mbim_desc)))
break;
ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
break;
default:
break;
}
advance:
/* advance to next descriptor */
temp = buf[0];
buf += temp;
len -= temp;
}
/* some buggy devices have an IAD but no CDC Union */
if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
}
/* check if we got everything */
if (!ctx->data || (!ctx->mbim_desc && !ctx->ether_desc)) {
dev_dbg(&intf->dev, "CDC descriptors missing\n");
goto error;
}
/* claim data interface, if different from control */
if (ctx->data != ctx->control) {
temp = usb_driver_claim_interface(driver, ctx->data, dev);
if (temp) {
dev_dbg(&intf->dev, "failed to claim data intf\n");
goto error;
}
}
iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
/* reset data interface */
temp = usb_set_interface(dev->udev, iface_no, 0);
if (temp) {
dev_dbg(&intf->dev, "set interface failed\n");
goto error2;
}
/* configure data interface */
temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
if (temp) {
dev_dbg(&intf->dev, "set interface failed\n");
goto error2;
}
cdc_ncm_find_endpoints(dev, ctx->data);
cdc_ncm_find_endpoints(dev, ctx->control);
if (!dev->in || !dev->out || !dev->status) {
dev_dbg(&intf->dev, "failed to collect endpoints\n");
goto error2;
}
/* initialize data interface */
if (cdc_ncm_setup(dev)) {
dev_dbg(&intf->dev, "cdc_ncm_setup() failed\n");
goto error2;
}
usb_set_intfdata(ctx->data, dev);
usb_set_intfdata(ctx->control, dev);
if (ctx->ether_desc) {
temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
if (temp) {
dev_dbg(&intf->dev, "failed to get mac address\n");
goto error2;
}
dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
}
/* usbnet use these values for sizing tx/rx queues */
dev->hard_mtu = ctx->tx_max;
dev->rx_urb_size = ctx->rx_max;
return 0;
error2:
usb_set_intfdata(ctx->control, NULL);
usb_set_intfdata(ctx->data, NULL);
if (ctx->data != ctx->control)
usb_driver_release_interface(driver, ctx->data);
error:
cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
dev->data[0] = 0;
dev_info(&intf->dev, "bind() failure\n");
return -ENODEV;
}
EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
{
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
struct usb_driver *driver = driver_of(intf);
if (ctx == NULL)
return; /* no setup */
atomic_set(&ctx->stop, 1);
if (hrtimer_active(&ctx->tx_timer))
hrtimer_cancel(&ctx->tx_timer);
tasklet_kill(&ctx->bh);
/* handle devices with combined control and data interface */
if (ctx->control == ctx->data)
ctx->data = NULL;
/* disconnect master --> disconnect slave */
if (intf == ctx->control && ctx->data) {
usb_set_intfdata(ctx->data, NULL);
usb_driver_release_interface(driver, ctx->data);
ctx->data = NULL;
} else if (intf == ctx->data && ctx->control) {
usb_set_intfdata(ctx->control, NULL);
usb_driver_release_interface(driver, ctx->control);
ctx->control = NULL;
}
usb_set_intfdata(intf, NULL);
cdc_ncm_free(ctx);
}
EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
/* Select the MBIM altsetting iff it is preferred and available,
* returning the number of the corresponding data interface altsetting
*/
u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf)
{
struct usb_host_interface *alt;
/* The MBIM spec defines a NCM compatible default altsetting,
* which we may have matched:
*
* "Functions that implement both NCM 1.0 and MBIM (an
* “NCM/MBIM function”) according to this recommendation
* shall provide two alternate settings for the
* Communication Interface. Alternate setting 0, and the
* associated class and endpoint descriptors, shall be
* constructed according to the rules given for the
* Communication Interface in section 5 of [USBNCM10].
* Alternate setting 1, and the associated class and
* endpoint descriptors, shall be constructed according to
* the rules given in section 6 (USB Device Model) of this
* specification."
*/
if (prefer_mbim && intf->num_altsetting == 2) {
alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
if (alt && cdc_ncm_comm_intf_is_mbim(alt) &&
!usb_set_interface(dev->udev,
intf->cur_altsetting->desc.bInterfaceNumber,
CDC_NCM_COMM_ALTSETTING_MBIM))
return CDC_NCM_DATA_ALTSETTING_MBIM;
}
return CDC_NCM_DATA_ALTSETTING_NCM;
}
EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
{
int ret;
/* MBIM backwards compatible function? */
cdc_ncm_select_altsetting(dev, intf);
if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
return -ENODEV;
/* NCM data altsetting is always 1 */
ret = cdc_ncm_bind_common(dev, intf, 1);
/*
* We should get an event when network connection is "connected" or
* "disconnected". Set network connection in "disconnected" state
* (carrier is OFF) during attach, so the IP network stack does not
* start IPv6 negotiation and more.
*/
usbnet_link_change(dev, 0, 0);
return ret;
}
static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
{
size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
if (skb->len + align > max)
align = max - skb->len;
if (align && skb_tailroom(skb) >= align)
memset(skb_put(skb, align), 0, align);
}
/* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
* allocating a new one within skb
*/
static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
{
struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
/* follow the chain of NDPs, looking for a match */
while (ndpoffset) {
ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
if (ndp16->dwSignature == sign)
return ndp16;
ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
}
/* align new NDP */
cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
/* verify that there is room for the NDP and the datagram (reserve) */
if ((ctx->tx_max - skb->len - reserve) < CDC_NCM_NDP_SIZE)
return NULL;
/* link to it */
if (ndp16)
ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
else
nth16->wNdpIndex = cpu_to_le16(skb->len);
/* push a new empty NDP */
ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, CDC_NCM_NDP_SIZE), 0, CDC_NCM_NDP_SIZE);
ndp16->dwSignature = sign;
ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
return ndp16;
}
struct sk_buff *
cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
{
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
struct usb_cdc_ncm_nth16 *nth16;
struct usb_cdc_ncm_ndp16 *ndp16;
struct sk_buff *skb_out;
u16 n = 0, index, ndplen;
u8 ready2send = 0;
/* if there is a remaining skb, it gets priority */
if (skb != NULL) {
swap(skb, ctx->tx_rem_skb);
swap(sign, ctx->tx_rem_sign);
} else {
ready2send = 1;
}
/* check if we are resuming an OUT skb */
skb_out = ctx->tx_curr_skb;
/* allocate a new OUT skb */
if (!skb_out) {
skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
if (skb_out == NULL) {
if (skb != NULL) {
dev_kfree_skb_any(skb);
dev->net->stats.tx_dropped++;
}
goto exit_no_skb;
}
/* fill out the initial 16-bit NTB header */
nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
/* count total number of frames in this NTB */
ctx->tx_curr_frame_num = 0;
}
for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
/* send any remaining skb first */
if (skb == NULL) {
skb = ctx->tx_rem_skb;
sign = ctx->tx_rem_sign;
ctx->tx_rem_skb = NULL;
/* check for end of skb */
if (skb == NULL)
break;
}
/* get the appropriate NDP for this skb */
ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
/* align beginning of next frame */
cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
/* check if we had enough room left for both NDP and frame */
if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
if (n == 0) {
/* won't fit, MTU problem? */
dev_kfree_skb_any(skb);
skb = NULL;
dev->net->stats.tx_dropped++;
} else {
/* no room for skb - store for later */
if (ctx->tx_rem_skb != NULL) {
dev_kfree_skb_any(ctx->tx_rem_skb);
dev->net->stats.tx_dropped++;
}
ctx->tx_rem_skb = skb;
ctx->tx_rem_sign = sign;
skb = NULL;
ready2send = 1;
}
break;
}
/* calculate frame number withing this NDP */
ndplen = le16_to_cpu(ndp16->wLength);
index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
/* OK, add this skb */
ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
dev_kfree_skb_any(skb);
skb = NULL;
/* send now if this NDP is full */
if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
ready2send = 1;
break;
}
}
/* free up any dangling skb */
if (skb != NULL) {
dev_kfree_skb_any(skb);
skb = NULL;
dev->net->stats.tx_dropped++;
}
ctx->tx_curr_frame_num = n;
if (n == 0) {
/* wait for more frames */
/* push variables */
ctx->tx_curr_skb = skb_out;
goto exit_no_skb;
} else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
/* wait for more frames */
/* push variables */
ctx->tx_curr_skb = skb_out;
/* set the pending count */
if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
goto exit_no_skb;
} else {
/* frame goes out */
/* variables will be reset at next call */
}
/* If collected data size is less or equal CDC_NCM_MIN_TX_PKT
* bytes, we send buffers as it is. If we get more data, it
* would be more efficient for USB HS mobile device with DMA
* engine to receive a full size NTB, than canceling DMA
* transfer and receiving a short packet.
*
* This optimization support is pointless if we end up sending
* a ZLP after full sized NTBs.
*/
if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
skb_out->len > CDC_NCM_MIN_TX_PKT)
memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
ctx->tx_max - skb_out->len);
else if ((skb_out->len % dev->maxpacket) == 0)
*skb_put(skb_out, 1) = 0; /* force short packet */
/* set final frame length */
nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
nth16->wBlockLength = cpu_to_le16(skb_out->len);
/* return skb */
ctx->tx_curr_skb = NULL;
dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
return skb_out;
exit_no_skb:
/* Start timer, if there is a remaining skb */
if (ctx->tx_curr_skb != NULL)
cdc_ncm_tx_timeout_start(ctx);
return NULL;
}
EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
{
/* start timer, if not already started */
if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
hrtimer_start(&ctx->tx_timer,
ktime_set(0, CDC_NCM_TIMER_INTERVAL),
HRTIMER_MODE_REL);
}
static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
{
struct cdc_ncm_ctx *ctx =
container_of(timer, struct cdc_ncm_ctx, tx_timer);
if (!atomic_read(&ctx->stop))
tasklet_schedule(&ctx->bh);
return HRTIMER_NORESTART;
}
static void cdc_ncm_txpath_bh(unsigned long param)
{
struct usbnet *dev = (struct usbnet *)param;
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
spin_lock_bh(&ctx->mtx);
if (ctx->tx_timer_pending != 0) {
ctx->tx_timer_pending--;
cdc_ncm_tx_timeout_start(ctx);
spin_unlock_bh(&ctx->mtx);
} else if (dev->net != NULL) {
spin_unlock_bh(&ctx->mtx);
netif_tx_lock_bh(dev->net);
usbnet_start_xmit(NULL, dev->net);
netif_tx_unlock_bh(dev->net);
} else {
spin_unlock_bh(&ctx->mtx);
}
}
struct sk_buff *
cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
struct sk_buff *skb_out;
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
/*
* The Ethernet API we are using does not support transmitting
* multiple Ethernet frames in a single call. This driver will
* accumulate multiple Ethernet frames and send out a larger
* USB frame when the USB buffer is full or when a single jiffies
* timeout happens.
*/
if (ctx == NULL)
goto error;
spin_lock_bh(&ctx->mtx);
skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
spin_unlock_bh(&ctx->mtx);
return skb_out;
error:
if (skb != NULL)
dev_kfree_skb_any(skb);
return NULL;
}
EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
/* verify NTB header and return offset of first NDP, or negative error */
int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
{
struct usbnet *dev = netdev_priv(skb_in->dev);
struct usb_cdc_ncm_nth16 *nth16;
int len;
int ret = -EINVAL;
if (ctx == NULL)
goto error;
if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
sizeof(struct usb_cdc_ncm_ndp16))) {
netif_dbg(dev, rx_err, dev->net, "frame too short\n");
goto error;
}
nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
netif_dbg(dev, rx_err, dev->net,
"invalid NTH16 signature <%#010x>\n",
le32_to_cpu(nth16->dwSignature));
goto error;
}
len = le16_to_cpu(nth16->wBlockLength);
if (len > ctx->rx_max) {
netif_dbg(dev, rx_err, dev->net,
"unsupported NTB block length %u/%u\n", len,
ctx->rx_max);
goto error;
}
if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
(ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
!((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
netif_dbg(dev, rx_err, dev->net,
"sequence number glitch prev=%d curr=%d\n",
ctx->rx_seq, le16_to_cpu(nth16->wSequence));
}
ctx->rx_seq = le16_to_cpu(nth16->wSequence);
ret = le16_to_cpu(nth16->wNdpIndex);
error:
return ret;
}
EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
/* verify NDP header and return number of datagrams, or negative error */
int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
{
struct usbnet *dev = netdev_priv(skb_in->dev);
struct usb_cdc_ncm_ndp16 *ndp16;
int ret = -EINVAL;
if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
ndpoffset);
goto error;
}
ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
le16_to_cpu(ndp16->wLength));
goto error;
}
ret = ((le16_to_cpu(ndp16->wLength) -
sizeof(struct usb_cdc_ncm_ndp16)) /
sizeof(struct usb_cdc_ncm_dpe16));
ret--; /* we process NDP entries except for the last one */
if ((sizeof(struct usb_cdc_ncm_ndp16) +
ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
ret = -EINVAL;
}
error:
return ret;
}
EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
{
struct sk_buff *skb;
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
int len;
int nframes;
int x;
int offset;
struct usb_cdc_ncm_ndp16 *ndp16;
struct usb_cdc_ncm_dpe16 *dpe16;
int ndpoffset;
int loopcount = 50; /* arbitrary max preventing infinite loop */
ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
if (ndpoffset < 0)
goto error;
next_ndp:
nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
if (nframes < 0)
goto error;
ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
netif_dbg(dev, rx_err, dev->net,
"invalid DPT16 signature <%#010x>\n",
le32_to_cpu(ndp16->dwSignature));
goto err_ndp;
}
dpe16 = ndp16->dpe16;
for (x = 0; x < nframes; x++, dpe16++) {
offset = le16_to_cpu(dpe16->wDatagramIndex);
len = le16_to_cpu(dpe16->wDatagramLength);
/*
* CDC NCM ch. 3.7
* All entries after first NULL entry are to be ignored
*/
if ((offset == 0) || (len == 0)) {
if (!x)
goto err_ndp; /* empty NTB */
break;
}
/* sanity checking */
if (((offset + len) > skb_in->len) ||
(len > ctx->rx_max) || (len < ETH_HLEN)) {
netif_dbg(dev, rx_err, dev->net,
"invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
x, offset, len, skb_in);
if (!x)
goto err_ndp;
break;
} else {
skb = skb_clone(skb_in, GFP_ATOMIC);
if (!skb)
goto error;
skb->len = len;
skb->data = ((u8 *)skb_in->data) + offset;
skb_set_tail_pointer(skb, len);
usbnet_skb_return(dev, skb);
}
}
err_ndp:
/* are there more NDPs to process? */
ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
if (ndpoffset && loopcount--)
goto next_ndp;
return 1;
error:
return 0;
}
EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
static void
cdc_ncm_speed_change(struct usbnet *dev,
struct usb_cdc_speed_change *data)
{
uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
/*
* Currently the USB-NET API does not support reporting the actual
* device speed. Do print it instead.
*/
if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
netif_info(dev, link, dev->net,
"%u mbit/s downlink %u mbit/s uplink\n",
(unsigned int)(rx_speed / 1000000U),
(unsigned int)(tx_speed / 1000000U));
} else {
netif_info(dev, link, dev->net,
"%u kbit/s downlink %u kbit/s uplink\n",
(unsigned int)(rx_speed / 1000U),
(unsigned int)(tx_speed / 1000U));
}
}
static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
{
struct cdc_ncm_ctx *ctx;
struct usb_cdc_notification *event;
ctx = (struct cdc_ncm_ctx *)dev->data[0];
if (urb->actual_length < sizeof(*event))
return;
/* test for split data in 8-byte chunks */
if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
cdc_ncm_speed_change(dev,
(struct usb_cdc_speed_change *)urb->transfer_buffer);
return;
}
event = urb->transfer_buffer;
switch (event->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
/*
* According to the CDC NCM specification ch.7.1
* USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
* sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
*/
ctx->connected = le16_to_cpu(event->wValue);
netif_info(dev, link, dev->net,
"network connection: %sconnected\n",
ctx->connected ? "" : "dis");
usbnet_link_change(dev, ctx->connected, 0);
break;
case USB_CDC_NOTIFY_SPEED_CHANGE:
if (urb->actual_length < (sizeof(*event) +
sizeof(struct usb_cdc_speed_change)))
set_bit(EVENT_STS_SPLIT, &dev->flags);
else
cdc_ncm_speed_change(dev,
(struct usb_cdc_speed_change *)&event[1]);
break;
default:
dev_dbg(&dev->udev->dev,
"NCM: unexpected notification 0x%02x!\n",
event->bNotificationType);
break;
}
}
static int cdc_ncm_check_connect(struct usbnet *dev)
{
struct cdc_ncm_ctx *ctx;
ctx = (struct cdc_ncm_ctx *)dev->data[0];
if (ctx == NULL)
return 1; /* disconnected */
return !ctx->connected;
}
static const struct driver_info cdc_ncm_info = {
.description = "CDC NCM",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
.manage_power = usbnet_manage_power,
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
};
/* Same as cdc_ncm_info, but with FLAG_WWAN */
static const struct driver_info wwan_info = {
.description = "Mobile Broadband Network Device",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
| FLAG_WWAN,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
.manage_power = usbnet_manage_power,
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
};
/* Same as wwan_info, but with FLAG_NOARP */
static const struct driver_info wwan_noarp_info = {
.description = "Mobile Broadband Network Device (NO ARP)",
.flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
| FLAG_WWAN | FLAG_NOARP,
.bind = cdc_ncm_bind,
.unbind = cdc_ncm_unbind,
.check_connect = cdc_ncm_check_connect,
.manage_power = usbnet_manage_power,
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
};
static const struct usb_device_id cdc_devs[] = {
/* Ericsson MBM devices like F5521gw */
{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_VENDOR,
.idVendor = 0x0bdb,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
.driver_info = (unsigned long) &wwan_info,
},
/* Dell branded MBM devices like DW5550 */
{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_VENDOR,
.idVendor = 0x413c,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
.driver_info = (unsigned long) &wwan_info,
},
/* Toshiba branded MBM devices */
{ .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_VENDOR,
.idVendor = 0x0930,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
.driver_info = (unsigned long) &wwan_info,
},
/* tag Huawei devices as wwan */
{ USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
USB_CLASS_COMM,
USB_CDC_SUBCLASS_NCM,
USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&wwan_info,
},
/* Infineon(now Intel) HSPA Modem platform */
{ USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
USB_CLASS_COMM,
USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&wwan_noarp_info,
},
/* Generic CDC-NCM devices */
{ USB_INTERFACE_INFO(USB_CLASS_COMM,
USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&cdc_ncm_info,
},
{
},
};
MODULE_DEVICE_TABLE(usb, cdc_devs);
static struct usb_driver cdc_ncm_driver = {
.name = "cdc_ncm",
.id_table = cdc_devs,
.probe = usbnet_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.reset_resume = usbnet_resume,
.supports_autosuspend = 1,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(cdc_ncm_driver);
MODULE_AUTHOR("Hans Petter Selasky");
MODULE_DESCRIPTION("USB CDC NCM host driver");
MODULE_LICENSE("Dual BSD/GPL");
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