- 根目录:
- drivers
- net
- usb
- cdc_ncm.c
/*
* cdc_ncm.c
*
* Copyright (C) ST-Ericsson 2010-2011
* 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/init.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/version.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc.h>
#define DRIVER_VERSION "04-Aug-2011"
/* CDC NCM subclass 3.2.1 */
#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
/* Maximum NTB length */
#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */
/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
/* Default value for MaxDatagramSize */
#define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */
/*
* Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
* the last NULL entry. Any additional datagrams in NTB would be discarded.
*/
#define CDC_NCM_DPT_DATAGRAMS_MAX 32
/* Maximum amount of IN datagrams in NTB */
#define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */
/* Restart the timer, if amount of datagrams is less than given value */
#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
/* The following macro defines the minimum header space */
#define CDC_NCM_MIN_HDR_SIZE \
(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
struct cdc_ncm_data {
struct usb_cdc_ncm_nth16 nth16;
struct usb_cdc_ncm_ndp16 ndp16;
struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
};
struct cdc_ncm_ctx {
struct cdc_ncm_data rx_ncm;
struct cdc_ncm_data tx_ncm;
struct usb_cdc_ncm_ntb_parameters ncm_parm;
struct timer_list tx_timer;
const struct usb_cdc_ncm_desc *func_desc;
const struct usb_cdc_header_desc *header_desc;
const struct usb_cdc_union_desc *union_desc;
const struct usb_cdc_ether_desc *ether_desc;
struct net_device *netdev;
struct usb_device *udev;
struct usb_host_endpoint *in_ep;
struct usb_host_endpoint *out_ep;
struct usb_host_endpoint *status_ep;
struct usb_interface *intf;
struct usb_interface *control;
struct usb_interface *data;
struct sk_buff *tx_curr_skb;
struct sk_buff *tx_rem_skb;
spinlock_t mtx;
u32 tx_timer_pending;
u32 tx_curr_offset;
u32 tx_curr_last_offset;
u32 tx_curr_frame_num;
u32 rx_speed;
u32 tx_speed;
u32 rx_max;
u32 tx_max;
u32 max_datagram_size;
u16 tx_max_datagrams;
u16 tx_remainder;
u16 tx_modulus;
u16 tx_ndp_modulus;
u16 tx_seq;
u16 connected;
};
static void cdc_ncm_tx_timeout(unsigned long arg);
static const struct driver_info cdc_ncm_info;
static struct usb_driver cdc_ncm_driver;
static struct ethtool_ops cdc_ncm_ethtool_ops;
static const struct usb_device_id cdc_devs[] = {
{ 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 void
cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
{
struct usbnet *dev = netdev_priv(net);
strncpy(info->driver, dev->driver_name, sizeof(info->driver));
strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
strncpy(info->fw_version, dev->driver_info->description,
sizeof(info->fw_version));
usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
}
static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
{
u32 val;
u8 flags;
u8 iface_no;
int err;
u16 ntb_fmt_supported;
iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
err = usb_control_msg(ctx->udev,
usb_rcvctrlpipe(ctx->udev, 0),
USB_CDC_GET_NTB_PARAMETERS,
USB_TYPE_CLASS | USB_DIR_IN
| USB_RECIP_INTERFACE,
0, iface_no, &ctx->ncm_parm,
sizeof(ctx->ncm_parm), 10000);
if (err < 0) {
pr_debug("failed GET_NTB_PARAMETERS\n");
return 1;
}
/* read correct set of parameters according to device mode */
ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
/* devices prior to NCM Errata shall set this field to zero */
ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
if (ctx->func_desc != NULL)
flags = ctx->func_desc->bmNetworkCapabilities;
else
flags = 0;
pr_debug("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) {
pr_debug("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) {
pr_debug("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(ctx->ncm_parm.dwNtbInMaxSize)) {
if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
if (!ndp_in_sz) {
err = -ENOMEM;
goto size_err;
}
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, ndp_in_sz, 8, 1000);
kfree(ndp_in_sz);
} else {
__le32 *dwNtbInMaxSize;
dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
GFP_KERNEL);
if (!dwNtbInMaxSize) {
err = -ENOMEM;
goto size_err;
}
*dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, dwNtbInMaxSize, 4, 1000);
kfree(dwNtbInMaxSize);
}
size_err:
if (err < 0)
pr_debug("Setting NTB Input Size failed\n");
}
/* verify maximum size of transmitted NTB in bytes */
if ((ctx->tx_max <
(CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
(ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
pr_debug("Using default maximum transmit length=%d\n",
CDC_NCM_NTB_MAX_SIZE_TX);
ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
}
/*
* 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)) {
pr_debug("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)) {
pr_debug("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) {
pr_debug("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 = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_CRC_MODE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
USB_CDC_NCM_CRC_NOT_APPENDED,
iface_no, NULL, 0, 1000);
if (err < 0)
pr_debug("Setting CRC mode off failed\n");
}
/* set NTB format, if both formats are supported */
if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
| USB_DIR_OUT | USB_RECIP_INTERFACE,
USB_CDC_NCM_NTB16_FORMAT,
iface_no, NULL, 0, 1000);
if (err < 0)
pr_debug("Setting NTB format to 16-bit failed\n");
}
ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
/* set Max Datagram Size (MTU) */
if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
__le16 *max_datagram_size;
u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
max_datagram_size = kzalloc(sizeof(*max_datagram_size),
GFP_KERNEL);
if (!max_datagram_size) {
err = -ENOMEM;
goto max_dgram_err;
}
err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
USB_CDC_GET_MAX_DATAGRAM_SIZE,
USB_TYPE_CLASS | USB_DIR_IN
| USB_RECIP_INTERFACE,
0, iface_no, max_datagram_size,
2, 1000);
if (err < 0) {
pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
CDC_NCM_MIN_DATAGRAM_SIZE);
kfree(max_datagram_size);
} else {
ctx->max_datagram_size =
le16_to_cpu(*max_datagram_size);
/* Check Eth descriptor value */
if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
if (ctx->max_datagram_size > eth_max_sz)
ctx->max_datagram_size = eth_max_sz;
} else {
if (ctx->max_datagram_size >
CDC_NCM_MAX_DATAGRAM_SIZE)
ctx->max_datagram_size =
CDC_NCM_MAX_DATAGRAM_SIZE;
}
if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
ctx->max_datagram_size =
CDC_NCM_MIN_DATAGRAM_SIZE;
/* if value changed, update device */
err = usb_control_msg(ctx->udev,
usb_sndctrlpipe(ctx->udev, 0),
USB_CDC_SET_MAX_DATAGRAM_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0,
iface_no, max_datagram_size,
2, 1000);
kfree(max_datagram_size);
max_dgram_err:
if (err < 0)
pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
}
}
if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
return 0;
}
static void
cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
{
struct usb_host_endpoint *e;
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 (ctx->status_ep == NULL)
ctx->status_ep = e;
}
break;
case USB_ENDPOINT_XFER_BULK:
if (usb_endpoint_dir_in(&e->desc)) {
if (ctx->in_ep == NULL)
ctx->in_ep = e;
} else {
if (ctx->out_ep == NULL)
ctx->out_ep = e;
}
break;
default:
break;
}
}
}
static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
{
if (ctx == NULL)
return;
del_timer_sync(&ctx->tx_timer);
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);
}
static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
{
struct cdc_ncm_ctx *ctx;
struct usb_driver *driver;
u8 *buf;
int len;
int temp;
u8 iface_no;
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (ctx == NULL)
return -ENODEV;
memset(ctx, 0, sizeof(*ctx));
init_timer(&ctx->tx_timer);
spin_lock_init(&ctx->mtx);
ctx->netdev = dev->net;
/* store ctx pointer in device data field */
dev->data[0] = (unsigned long)ctx;
/* get some pointers */
driver = driver_of(intf);
buf = intf->cur_altsetting->extra;
len = intf->cur_altsetting->extralen;
ctx->udev = dev->udev;
ctx->intf = intf;
/* 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(*(ctx->union_desc)))
break;
ctx->union_desc =
(const struct usb_cdc_union_desc *)buf;
ctx->control = usb_ifnum_to_if(dev->udev,
ctx->union_desc->bMasterInterface0);
ctx->data = usb_ifnum_to_if(dev->udev,
ctx->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;
dev->hard_mtu =
le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
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;
default:
break;
}
advance:
/* advance to next descriptor */
temp = buf[0];
buf += temp;
len -= temp;
}
/* check if we got everything */
if ((ctx->control == NULL) || (ctx->data == NULL) ||
(ctx->ether_desc == NULL) || (ctx->control != intf))
goto error;
/* claim interfaces, if any */
temp = usb_driver_claim_interface(driver, ctx->data, dev);
if (temp)
goto error;
iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
/* reset data interface */
temp = usb_set_interface(dev->udev, iface_no, 0);
if (temp)
goto error2;
/* initialize data interface */
if (cdc_ncm_setup(ctx))
goto error2;
/* configure data interface */
temp = usb_set_interface(dev->udev, iface_no, 1);
if (temp)
goto error2;
cdc_ncm_find_endpoints(ctx, ctx->data);
cdc_ncm_find_endpoints(ctx, ctx->control);
if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
(ctx->status_ep == NULL))
goto error2;
dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
usb_set_intfdata(ctx->data, dev);
usb_set_intfdata(ctx->control, dev);
usb_set_intfdata(ctx->intf, dev);
temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
if (temp)
goto error2;
dev_info(&dev->udev->dev, "MAC-Address: "
"0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
dev->net->dev_addr[0], dev->net->dev_addr[1],
dev->net->dev_addr[2], dev->net->dev_addr[3],
dev->net->dev_addr[4], dev->net->dev_addr[5]);
dev->in = usb_rcvbulkpipe(dev->udev,
ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
dev->out = usb_sndbulkpipe(dev->udev,
ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
dev->status = ctx->status_ep;
dev->rx_urb_size = ctx->rx_max;
/*
* 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.
*/
netif_carrier_off(dev->net);
ctx->tx_speed = ctx->rx_speed = 0;
return 0;
error2:
usb_set_intfdata(ctx->control, NULL);
usb_set_intfdata(ctx->data, NULL);
usb_driver_release_interface(driver, ctx->data);
error:
cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
dev->data[0] = 0;
dev_info(&dev->udev->dev, "bind() failure\n");
return -ENODEV;
}
static 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 */
/* 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(ctx->intf, NULL);
cdc_ncm_free(ctx);
}
static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
{
if (first >= max)
return;
if (first >= end)
return;
if (end > max)
end = max;
memset(ptr + first, 0, end - first);
}
static struct sk_buff *
cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
{
struct sk_buff *skb_out;
u32 rem;
u32 offset;
u32 last_offset;
u16 n = 0, index;
u8 ready2send = 0;
/* if there is a remaining skb, it gets priority */
if (skb != NULL)
swap(skb, ctx->tx_rem_skb);
else
ready2send = 1;
/*
* +----------------+
* | skb_out |
* +----------------+
* ^ offset
* ^ last_offset
*/
/* check if we are resuming an OUT skb */
if (ctx->tx_curr_skb != NULL) {
/* pop variables */
skb_out = ctx->tx_curr_skb;
offset = ctx->tx_curr_offset;
last_offset = ctx->tx_curr_last_offset;
n = ctx->tx_curr_frame_num;
} else {
/* reset variables */
skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
if (skb_out == NULL) {
if (skb != NULL) {
dev_kfree_skb_any(skb);
ctx->netdev->stats.tx_dropped++;
}
goto exit_no_skb;
}
/* make room for NTH and NDP */
offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
ctx->tx_ndp_modulus) +
sizeof(struct usb_cdc_ncm_ndp16) +
(ctx->tx_max_datagrams + 1) *
sizeof(struct usb_cdc_ncm_dpe16);
/* store last valid offset before alignment */
last_offset = offset;
/* align first Datagram offset correctly */
offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
/* zero buffer till the first IP datagram */
cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
n = 0;
ctx->tx_curr_frame_num = 0;
}
for (; n < ctx->tx_max_datagrams; n++) {
/* check if end of transmit buffer is reached */
if (offset >= ctx->tx_max) {
ready2send = 1;
break;
}
/* compute maximum buffer size */
rem = ctx->tx_max - offset;
if (skb == NULL) {
skb = ctx->tx_rem_skb;
ctx->tx_rem_skb = NULL;
/* check for end of skb */
if (skb == NULL)
break;
}
if (skb->len > rem) {
if (n == 0) {
/* won't fit, MTU problem? */
dev_kfree_skb_any(skb);
skb = NULL;
ctx->netdev->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);
ctx->netdev->stats.tx_dropped++;
}
ctx->tx_rem_skb = skb;
skb = NULL;
ready2send = 1;
}
break;
}
memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
/* update offset */
offset += skb->len;
/* store last valid offset before alignment */
last_offset = offset;
/* align offset correctly */
offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
/* zero padding */
cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
ctx->tx_max);
dev_kfree_skb_any(skb);
skb = NULL;
}
/* free up any dangling skb */
if (skb != NULL) {
dev_kfree_skb_any(skb);
skb = NULL;
ctx->netdev->stats.tx_dropped++;
}
ctx->tx_curr_frame_num = n;
if (n == 0) {
/* wait for more frames */
/* push variables */
ctx->tx_curr_skb = skb_out;
ctx->tx_curr_offset = offset;
ctx->tx_curr_last_offset = last_offset;
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;
ctx->tx_curr_offset = offset;
ctx->tx_curr_last_offset = last_offset;
/* set the pending count */
if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
ctx->tx_timer_pending = 2;
goto exit_no_skb;
} else {
/* frame goes out */
/* variables will be reset at next call */
}
/* check for overflow */
if (last_offset > ctx->tx_max)
last_offset = ctx->tx_max;
/* revert offset */
offset = last_offset;
/*
* 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.
*/
if (offset > CDC_NCM_MIN_TX_PKT)
offset = ctx->tx_max;
/* final zero padding */
cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
/* store last offset */
last_offset = offset;
if (((last_offset < ctx->tx_max) && ((last_offset %
le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
(((last_offset == ctx->tx_max) && ((ctx->tx_max %
le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
(ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
/* force short packet */
*(((u8 *)skb_out->data) + last_offset) = 0;
last_offset++;
}
/* zero the rest of the DPEs plus the last NULL entry */
for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
}
/* fill out 16-bit NTB header */
ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
ctx->tx_ncm.nth16.wHeaderLength =
cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
ctx->tx_seq++;
/* fill out 16-bit NDP table */
ctx->tx_ncm.ndp16.dwSignature =
cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
sizeof(struct usb_cdc_ncm_dpe16));
ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
memcpy(((u8 *)skb_out->data) + index,
&(ctx->tx_ncm.ndp16),
sizeof(ctx->tx_ncm.ndp16));
memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
&(ctx->tx_ncm.dpe16),
(ctx->tx_curr_frame_num + 1) *
sizeof(struct usb_cdc_ncm_dpe16));
/* set frame length */
skb_put(skb_out, last_offset);
/* return skb */
ctx->tx_curr_skb = NULL;
return skb_out;
exit_no_skb:
return NULL;
}
static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
{
/* start timer, if not already started */
if (timer_pending(&ctx->tx_timer) == 0) {
ctx->tx_timer.function = &cdc_ncm_tx_timeout;
ctx->tx_timer.data = (unsigned long)ctx;
ctx->tx_timer.expires = jiffies + ((HZ + 999) / 1000);
add_timer(&ctx->tx_timer);
}
}
static void cdc_ncm_tx_timeout(unsigned long arg)
{
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)arg;
u8 restart;
spin_lock(&ctx->mtx);
if (ctx->tx_timer_pending != 0) {
ctx->tx_timer_pending--;
restart = 1;
} else {
restart = 0;
}
spin_unlock(&ctx->mtx);
if (restart) {
spin_lock(&ctx->mtx);
cdc_ncm_tx_timeout_start(ctx);
spin_unlock(&ctx->mtx);
} else if (ctx->netdev != NULL) {
usbnet_start_xmit(NULL, ctx->netdev);
}
}
static 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];
u8 need_timer = 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(&ctx->mtx);
skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
if (ctx->tx_curr_skb != NULL)
need_timer = 1;
/* Start timer, if there is a remaining skb */
if (need_timer)
cdc_ncm_tx_timeout_start(ctx);
if (skb_out)
dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
spin_unlock(&ctx->mtx);
return skb_out;
error:
if (skb != NULL)
dev_kfree_skb_any(skb);
return NULL;
}
static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
{
struct sk_buff *skb;
struct cdc_ncm_ctx *ctx;
int sumlen;
int actlen;
int temp;
int nframes;
int x;
int offset;
ctx = (struct cdc_ncm_ctx *)dev->data[0];
if (ctx == NULL)
goto error;
actlen = skb_in->len;
sumlen = CDC_NCM_NTB_MAX_SIZE_RX;
if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) {
pr_debug("frame too short\n");
goto error;
}
memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data),
sizeof(ctx->rx_ncm.nth16));
if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) !=
USB_CDC_NCM_NTH16_SIGN) {
pr_debug("invalid NTH16 signature <%u>\n",
le32_to_cpu(ctx->rx_ncm.nth16.dwSignature));
goto error;
}
temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength);
if (temp > sumlen) {
pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen);
goto error;
}
temp = le16_to_cpu(ctx->rx_ncm.nth16.wNdpIndex);
if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) {
pr_debug("invalid DPT16 index\n");
goto error;
}
memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp,
sizeof(ctx->rx_ncm.ndp16));
if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) !=
USB_CDC_NCM_NDP16_NOCRC_SIGN) {
pr_debug("invalid DPT16 signature <%u>\n",
le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
goto error;
}
if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) <
USB_CDC_NCM_NDP16_LENGTH_MIN) {
pr_debug("invalid DPT16 length <%u>\n",
le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
goto error;
}
nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) -
sizeof(struct usb_cdc_ncm_ndp16)) /
sizeof(struct usb_cdc_ncm_dpe16));
nframes--; /* we process NDP entries except for the last one */
pr_debug("nframes = %u\n", nframes);
temp += sizeof(ctx->rx_ncm.ndp16);
if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) {
pr_debug("Invalid nframes = %d\n", nframes);
goto error;
}
if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) {
pr_debug("Truncating number of frames from %u to %u\n",
nframes, CDC_NCM_DPT_DATAGRAMS_MAX);
nframes = CDC_NCM_DPT_DATAGRAMS_MAX;
}
memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp,
nframes * (sizeof(struct usb_cdc_ncm_dpe16)));
for (x = 0; x < nframes; x++) {
offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex);
temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength);
/*
* CDC NCM ch. 3.7
* All entries after first NULL entry are to be ignored
*/
if ((offset == 0) || (temp == 0)) {
if (!x)
goto error; /* empty NTB */
break;
}
/* sanity checking */
if (((offset + temp) > actlen) ||
(temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) {
pr_debug("invalid frame detected (ignored)"
"offset[%u]=%u, length=%u, skb=%p\n",
x, offset, temp, skb_in);
if (!x)
goto error;
break;
} else {
skb = skb_clone(skb_in, GFP_ATOMIC);
if (!skb)
goto error;
skb->len = temp;
skb->data = ((u8 *)skb_in->data) + offset;
skb_set_tail_pointer(skb, temp);
usbnet_skb_return(dev, skb);
}
}
return 1;
error:
return 0;
}
static void
cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
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 != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
ctx->tx_speed = tx_speed;
ctx->rx_speed = rx_speed;
if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
printk(KERN_INFO KBUILD_MODNAME
": %s: %u mbit/s downlink "
"%u mbit/s uplink\n",
ctx->netdev->name,
(unsigned int)(rx_speed / 1000000U),
(unsigned int)(tx_speed / 1000000U));
} else {
printk(KERN_INFO KBUILD_MODNAME
": %s: %u kbit/s downlink "
"%u kbit/s uplink\n",
ctx->netdev->name,
(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(ctx,
(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 = event->wValue;
printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
" %sconnected\n",
ctx->netdev->name, ctx->connected ? "" : "dis");
if (ctx->connected)
netif_carrier_on(dev->net);
else {
netif_carrier_off(dev->net);
ctx->tx_speed = ctx->rx_speed = 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(ctx,
(struct usb_cdc_speed_change *) &event[1]);
break;
default:
dev_err(&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 int
cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
{
return usbnet_probe(udev, prod);
}
static void cdc_ncm_disconnect(struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
if (dev == NULL)
return; /* already disconnected */
usbnet_disconnect(intf);
}
static int cdc_ncm_manage_power(struct usbnet *dev, int status)
{
dev->intf->needs_remote_wakeup = status;
return 0;
}
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 = cdc_ncm_manage_power,
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
};
static struct usb_driver cdc_ncm_driver = {
.name = "cdc_ncm",
.id_table = cdc_devs,
.probe = cdc_ncm_probe,
.disconnect = cdc_ncm_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.reset_resume = usbnet_resume,
.supports_autosuspend = 1,
};
static struct ethtool_ops cdc_ncm_ethtool_ops = {
.get_drvinfo = cdc_ncm_get_drvinfo,
.get_link = usbnet_get_link,
.get_msglevel = usbnet_get_msglevel,
.set_msglevel = usbnet_set_msglevel,
.get_settings = usbnet_get_settings,
.set_settings = usbnet_set_settings,
.nway_reset = usbnet_nway_reset,
};
static int __init cdc_ncm_init(void)
{
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION "\n");
return usb_register(&cdc_ncm_driver);
}
module_init(cdc_ncm_init);
static void __exit cdc_ncm_exit(void)
{
usb_deregister(&cdc_ncm_driver);
}
module_exit(cdc_ncm_exit);
MODULE_AUTHOR("Hans Petter Selasky");
MODULE_DESCRIPTION("USB CDC NCM host driver");
MODULE_LICENSE("Dual BSD/GPL");