drivers/net/usb/cdc_ncm.c

   1 /*
   2  * cdc_ncm.c
   3  *
   4  * Copyright (C) ST-Ericsson 2010-2011
   5  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
   6  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
   7  *
   8  * USB Host Driver for Network Control Model (NCM)
   9  * http://www.usb.org/developers/devclass_docs/NCM10.zip
  10  *
  11  * The NCM encoding, decoding and initialization logic
  12  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
  13  *
  14  * This software is available to you under a choice of one of two
  15  * licenses. You may choose this file to be licensed under the terms
  16  * of the GNU General Public License (GPL) Version 2 or the 2-clause
  17  * BSD license listed below:
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in the
  26  *    documentation and/or other materials provided with the distribution.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/ctype.h>
  45 #include <linux/ethtool.h>
  46 #include <linux/workqueue.h>
  47 #include <linux/mii.h>
  48 #include <linux/crc32.h>
  49 #include <linux/usb.h>
  50 #include <linux/timer.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/atomic.h>
  53 #include <linux/usb/usbnet.h>
  54 #include <linux/usb/cdc.h>
  55
  56 #define DRIVER_VERSION                          "01-June-2011"
  57
  58 /* CDC NCM subclass 3.2.1 */
  59 #define USB_CDC_NCM_NDP16_LENGTH_MIN            0x10
  60
  61 /* Maximum NTB length */
  62 #define CDC_NCM_NTB_MAX_SIZE_TX                 16384   /* bytes */
  63 #define CDC_NCM_NTB_MAX_SIZE_RX                 16384   /* bytes */
  64
  65 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
  66 #define CDC_NCM_MIN_DATAGRAM_SIZE               1514    /* bytes */
  67
  68 #define CDC_NCM_MIN_TX_PKT                      512     /* bytes */
  69
  70 /* Default value for MaxDatagramSize */
  71 #define CDC_NCM_MAX_DATAGRAM_SIZE               2048    /* bytes */
  72
  73 /*
  74  * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
  75  * the last NULL entry. Any additional datagrams in NTB would be discarded.
  76  */
  77 #define CDC_NCM_DPT_DATAGRAMS_MAX               32
  78
  79 /* Maximum amount of IN datagrams in NTB */
  80 #define CDC_NCM_DPT_DATAGRAMS_IN_MAX            0 /* unlimited */
  81
  82 /* Restart the timer, if amount of datagrams is less than given value */
  83 #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT      3
  84
  85 /* The following macro defines the minimum header space */
  86 #define CDC_NCM_MIN_HDR_SIZE \
  87         (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
  88         (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
  89
  90 struct cdc_ncm_data {
  91         struct usb_cdc_ncm_nth16 nth16;
  92         struct usb_cdc_ncm_ndp16 ndp16;
  93         struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
  94 };
  95
  96 struct cdc_ncm_ctx {
  97         struct cdc_ncm_data rx_ncm;
  98         struct cdc_ncm_data tx_ncm;
  99         struct usb_cdc_ncm_ntb_parameters ncm_parm;
 100         struct timer_list tx_timer;
 101
 102         const struct usb_cdc_ncm_desc *func_desc;
 103         const struct usb_cdc_header_desc *header_desc;
 104         const struct usb_cdc_union_desc *union_desc;
 105         const struct usb_cdc_ether_desc *ether_desc;
 106
 107         struct net_device *netdev;
 108         struct usb_device *udev;
 109         struct usb_host_endpoint *in_ep;
 110         struct usb_host_endpoint *out_ep;
 111         struct usb_host_endpoint *status_ep;
 112         struct usb_interface *intf;
 113         struct usb_interface *control;
 114         struct usb_interface *data;
 115
 116         struct sk_buff *tx_curr_skb;
 117         struct sk_buff *tx_rem_skb;
 118
 119         spinlock_t mtx;
 120
 121         u32 tx_timer_pending;
 122         u32 tx_curr_offset;
 123         u32 tx_curr_last_offset;
 124         u32 tx_curr_frame_num;
 125         u32 rx_speed;
 126         u32 tx_speed;
 127         u32 rx_max;
 128         u32 tx_max;
 129         u32 max_datagram_size;
 130         u16 tx_max_datagrams;
 131         u16 tx_remainder;
 132         u16 tx_modulus;
 133         u16 tx_ndp_modulus;
 134         u16 tx_seq;
 135         u16 connected;
 136 };
 137
 138 static void cdc_ncm_tx_timeout(unsigned long arg);
 139 static const struct driver_info cdc_ncm_info;
 140 static struct usb_driver cdc_ncm_driver;
 141 static struct ethtool_ops cdc_ncm_ethtool_ops;
 142
 143 static const struct usb_device_id cdc_devs[] = {
 144         { USB_INTERFACE_INFO(USB_CLASS_COMM,
 145                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
 146                 .driver_info = (unsigned long)&cdc_ncm_info,
 147         },
 148         {
 149         },
 150 };
 151
 152 MODULE_DEVICE_TABLE(usb, cdc_devs);
 153
 154 static void
 155 cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 156 {
 157         struct usbnet *dev = netdev_priv(net);
 158
 159         strncpy(info->driver, dev->driver_name, sizeof(info->driver));
 160         strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
 161         strncpy(info->fw_version, dev->driver_info->description,
 162                 sizeof(info->fw_version));
 163         usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
 164 }
 165
 166 static int
 167 cdc_ncm_do_request(struct cdc_ncm_ctx *ctx, struct usb_cdc_notification *req,
 168                    void *data, u16 flags, u16 *actlen, u16 timeout)
 169 {
 170         int err;
 171
 172         err = usb_control_msg(ctx->udev, (req->bmRequestType & USB_DIR_IN) ?
 173                                 usb_rcvctrlpipe(ctx->udev, 0) :
 174                                 usb_sndctrlpipe(ctx->udev, 0),
 175                                 req->bNotificationType, req->bmRequestType,
 176                                 req->wValue,
 177                                 req->wIndex, data,
 178                                 req->wLength, timeout);
 179
 180         if (err < 0) {
 181                 if (actlen)
 182                         *actlen = 0;
 183                 return err;
 184         }
 185
 186         if (actlen)
 187                 *actlen = err;
 188
 189         return 0;
 190 }
 191
 192 static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
 193 {
 194         struct usb_cdc_notification req;
 195         u32 val;
 196         u8 flags;
 197         u8 iface_no;
 198         int err;
 199         u16 ntb_fmt_supported;
 200
 201         iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 202
 203         req.bmRequestType = USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE;
 204         req.bNotificationType = USB_CDC_GET_NTB_PARAMETERS;
 205         req.wValue = 0;
 206         req.wIndex = cpu_to_le16(iface_no);
 207         req.wLength = cpu_to_le16(sizeof(ctx->ncm_parm));
 208
 209         err = cdc_ncm_do_request(ctx, &req, &ctx->ncm_parm, 0, NULL, 1000);
 210         if (err) {
 211                 pr_debug("failed GET_NTB_PARAMETERS\n");
 212                 return 1;
 213         }
 214
 215         /* read correct set of parameters according to device mode */
 216         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
 217         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
 218         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
 219         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
 220         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
 221         /* devices prior to NCM Errata shall set this field to zero */
 222         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
 223         ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
 224
 225         if (ctx->func_desc != NULL)
 226                 flags = ctx->func_desc->bmNetworkCapabilities;
 227         else
 228                 flags = 0;
 229
 230         pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
 231                  "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
 232                  "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
 233                  ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
 234                  ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
 235
 236         /* max count of tx datagrams */
 237         if ((ctx->tx_max_datagrams == 0) ||
 238                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
 239                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
 240
 241         /* verify maximum size of received NTB in bytes */
 242         if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
 243                 pr_debug("Using min receive length=%d\n",
 244                                                 USB_CDC_NCM_NTB_MIN_IN_SIZE);
 245                 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
 246         }
 247
 248         if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
 249                 pr_debug("Using default maximum receive length=%d\n",
 250                                                 CDC_NCM_NTB_MAX_SIZE_RX);
 251                 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
 252         }
 253
 254         /* inform device about NTB input size changes */
 255         if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
 256                 req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT |
 257                                                         USB_RECIP_INTERFACE;
 258                 req.bNotificationType = USB_CDC_SET_NTB_INPUT_SIZE;
 259                 req.wValue = 0;
 260                 req.wIndex = cpu_to_le16(iface_no);
 261
 262                 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
 263                         struct usb_cdc_ncm_ndp_input_size ndp_in_sz;
 264
 265                         req.wLength = 8;
 266                         ndp_in_sz.dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
 267                         ndp_in_sz.wNtbInMaxDatagrams =
 268                                         cpu_to_le16(CDC_NCM_DPT_DATAGRAMS_MAX);
 269                         ndp_in_sz.wReserved = 0;
 270                         err = cdc_ncm_do_request(ctx, &req, &ndp_in_sz, 0, NULL,
 271                                                                         1000);
 272                 } else {
 273                         __le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
 274
 275                         req.wLength = 4;
 276                         err = cdc_ncm_do_request(ctx, &req, &dwNtbInMaxSize, 0,
 277                                                                 NULL, 1000);
 278                 }
 279
 280                 if (err)
 281                         pr_debug("Setting NTB Input Size failed\n");
 282         }
 283
 284         /* verify maximum size of transmitted NTB in bytes */
 285         if ((ctx->tx_max <
 286             (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
 287             (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
 288                 pr_debug("Using default maximum transmit length=%d\n",
 289                                                 CDC_NCM_NTB_MAX_SIZE_TX);
 290                 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
 291         }
 292
 293         /*
 294          * verify that the structure alignment is:
 295          * - power of two
 296          * - not greater than the maximum transmit length
 297          * - not less than four bytes
 298          */
 299         val = ctx->tx_ndp_modulus;
 300
 301         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 302             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 303                 pr_debug("Using default alignment: 4 bytes\n");
 304                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 305         }
 306
 307         /*
 308          * verify that the payload alignment is:
 309          * - power of two
 310          * - not greater than the maximum transmit length
 311          * - not less than four bytes
 312          */
 313         val = ctx->tx_modulus;
 314
 315         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 316             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 317                 pr_debug("Using default transmit modulus: 4 bytes\n");
 318                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 319         }
 320
 321         /* verify the payload remainder */
 322         if (ctx->tx_remainder >= ctx->tx_modulus) {
 323                 pr_debug("Using default transmit remainder: 0 bytes\n");
 324                 ctx->tx_remainder = 0;
 325         }
 326
 327         /* adjust TX-remainder according to NCM specification. */
 328         ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
 329                                                 (ctx->tx_modulus - 1));
 330
 331         /* additional configuration */
 332
 333         /* set CRC Mode */
 334         if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
 335                 req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT |
 336                                                         USB_RECIP_INTERFACE;
 337                 req.bNotificationType = USB_CDC_SET_CRC_MODE;
 338                 req.wValue = cpu_to_le16(USB_CDC_NCM_CRC_NOT_APPENDED);
 339                 req.wIndex = cpu_to_le16(iface_no);
 340                 req.wLength = 0;
 341
 342                 err = cdc_ncm_do_request(ctx, &req, NULL, 0, NULL, 1000);
 343                 if (err)
 344                         pr_debug("Setting CRC mode off failed\n");
 345         }
 346
 347         /* set NTB format, if both formats are supported */
 348         if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
 349                 req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT |
 350                                                         USB_RECIP_INTERFACE;
 351                 req.bNotificationType = USB_CDC_SET_NTB_FORMAT;
 352                 req.wValue = cpu_to_le16(USB_CDC_NCM_NTB16_FORMAT);
 353                 req.wIndex = cpu_to_le16(iface_no);
 354                 req.wLength = 0;
 355
 356                 err = cdc_ncm_do_request(ctx, &req, NULL, 0, NULL, 1000);
 357                 if (err)
 358                         pr_debug("Setting NTB format to 16-bit failed\n");
 359         }
 360
 361         ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
 362
 363         /* set Max Datagram Size (MTU) */
 364         if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
 365                 __le16 max_datagram_size;
 366                 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
 367
 368                 req.bmRequestType = USB_TYPE_CLASS | USB_DIR_IN |
 369                                                         USB_RECIP_INTERFACE;
 370                 req.bNotificationType = USB_CDC_GET_MAX_DATAGRAM_SIZE;
 371                 req.wValue = 0;
 372                 req.wIndex = cpu_to_le16(iface_no);
 373                 req.wLength = cpu_to_le16(2);
 374
 375                 err = cdc_ncm_do_request(ctx, &req, &max_datagram_size, 0, NULL,
 376                                                                         1000);
 377                 if (err) {
 378                         pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
 379                                                 CDC_NCM_MIN_DATAGRAM_SIZE);
 380                 } else {
 381                         ctx->max_datagram_size = le16_to_cpu(max_datagram_size);
 382                         /* Check Eth descriptor value */
 383                         if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
 384                                 if (ctx->max_datagram_size > eth_max_sz)
 385                                         ctx->max_datagram_size = eth_max_sz;
 386                         } else {
 387                                 if (ctx->max_datagram_size >
 388                                                 CDC_NCM_MAX_DATAGRAM_SIZE)
 389                                         ctx->max_datagram_size =
 390                                                 CDC_NCM_MAX_DATAGRAM_SIZE;
 391                         }
 392
 393                         if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
 394                                 ctx->max_datagram_size =
 395                                         CDC_NCM_MIN_DATAGRAM_SIZE;
 396
 397                         /* if value changed, update device */
 398                         req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT |
 399                                                         USB_RECIP_INTERFACE;
 400                         req.bNotificationType = USB_CDC_SET_MAX_DATAGRAM_SIZE;
 401                         req.wValue = 0;
 402                         req.wIndex = cpu_to_le16(iface_no);
 403                         req.wLength = 2;
 404                         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
 405
 406                         err = cdc_ncm_do_request(ctx, &req, &max_datagram_size,
 407                                                                 0, NULL, 1000);
 408                         if (err)
 409                                 pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
 410                 }
 411
 412         }
 413
 414         if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
 415                 ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
 416
 417         return 0;
 418 }
 419
 420 static void
 421 cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
 422 {
 423         struct usb_host_endpoint *e;
 424         u8 ep;
 425
 426         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
 427
 428                 e = intf->cur_altsetting->endpoint + ep;
 429                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 430                 case USB_ENDPOINT_XFER_INT:
 431                         if (usb_endpoint_dir_in(&e->desc)) {
 432                                 if (ctx->status_ep == NULL)
 433                                         ctx->status_ep = e;
 434                         }
 435                         break;
 436
 437                 case USB_ENDPOINT_XFER_BULK:
 438                         if (usb_endpoint_dir_in(&e->desc)) {
 439                                 if (ctx->in_ep == NULL)
 440                                         ctx->in_ep = e;
 441                         } else {
 442                                 if (ctx->out_ep == NULL)
 443                                         ctx->out_ep = e;
 444                         }
 445                         break;
 446
 447                 default:
 448                         break;
 449                 }
 450         }
 451 }
 452
 453 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
 454 {
 455         if (ctx == NULL)
 456                 return;
 457
 458         del_timer_sync(&ctx->tx_timer);
 459
 460         if (ctx->tx_rem_skb != NULL) {
 461                 dev_kfree_skb_any(ctx->tx_rem_skb);
 462                 ctx->tx_rem_skb = NULL;
 463         }
 464
 465         if (ctx->tx_curr_skb != NULL) {
 466                 dev_kfree_skb_any(ctx->tx_curr_skb);
 467                 ctx->tx_curr_skb = NULL;
 468         }
 469
 470         kfree(ctx);
 471 }
 472
 473 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
 474 {
 475         struct cdc_ncm_ctx *ctx;
 476         struct usb_driver *driver;
 477         u8 *buf;
 478         int len;
 479         int temp;
 480         u8 iface_no;
 481
 482         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 483         if (ctx == NULL)
 484                 return -ENODEV;
 485
 486         memset(ctx, 0, sizeof(*ctx));
 487
 488         init_timer(&ctx->tx_timer);
 489         spin_lock_init(&ctx->mtx);
 490         ctx->netdev = dev->net;
 491
 492         /* store ctx pointer in device data field */
 493         dev->data[0] = (unsigned long)ctx;
 494
 495         /* get some pointers */
 496         driver = driver_of(intf);
 497         buf = intf->cur_altsetting->extra;
 498         len = intf->cur_altsetting->extralen;
 499
 500         ctx->udev = dev->udev;
 501         ctx->intf = intf;
 502
 503         /* parse through descriptors associated with control interface */
 504         while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
 505
 506                 if (buf[1] != USB_DT_CS_INTERFACE)
 507                         goto advance;
 508
 509                 switch (buf[2]) {
 510                 case USB_CDC_UNION_TYPE:
 511                         if (buf[0] < sizeof(*(ctx->union_desc)))
 512                                 break;
 513
 514                         ctx->union_desc =
 515                                         (const struct usb_cdc_union_desc *)buf;
 516
 517                         ctx->control = usb_ifnum_to_if(dev->udev,
 518                                         ctx->union_desc->bMasterInterface0);
 519                         ctx->data = usb_ifnum_to_if(dev->udev,
 520                                         ctx->union_desc->bSlaveInterface0);
 521                         break;
 522
 523                 case USB_CDC_ETHERNET_TYPE:
 524                         if (buf[0] < sizeof(*(ctx->ether_desc)))
 525                                 break;
 526
 527                         ctx->ether_desc =
 528                                         (const struct usb_cdc_ether_desc *)buf;
 529                         dev->hard_mtu =
 530                                 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
 531
 532                         if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
 533                                 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
 534                         else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
 535                                 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
 536                         break;
 537
 538                 case USB_CDC_NCM_TYPE:
 539                         if (buf[0] < sizeof(*(ctx->func_desc)))
 540                                 break;
 541
 542                         ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
 543                         break;
 544
 545                 default:
 546                         break;
 547                 }
 548 advance:
 549                 /* advance to next descriptor */
 550                 temp = buf[0];
 551                 buf += temp;
 552                 len -= temp;
 553         }
 554
 555         /* check if we got everything */
 556         if ((ctx->control == NULL) || (ctx->data == NULL) ||
 557             (ctx->ether_desc == NULL) || (ctx->control != intf))
 558                 goto error;
 559
 560         /* claim interfaces, if any */
 561         temp = usb_driver_claim_interface(driver, ctx->data, dev);
 562         if (temp)
 563                 goto error;
 564
 565         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
 566
 567         /* reset data interface */
 568         temp = usb_set_interface(dev->udev, iface_no, 0);
 569         if (temp)
 570                 goto error2;
 571
 572         /* initialize data interface */
 573         if (cdc_ncm_setup(ctx))
 574                 goto error2;
 575
 576         /* configure data interface */
 577         temp = usb_set_interface(dev->udev, iface_no, 1);
 578         if (temp)
 579                 goto error2;
 580
 581         cdc_ncm_find_endpoints(ctx, ctx->data);
 582         cdc_ncm_find_endpoints(ctx, ctx->control);
 583
 584         if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
 585             (ctx->status_ep == NULL))
 586                 goto error2;
 587
 588         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
 589
 590         usb_set_intfdata(ctx->data, dev);
 591         usb_set_intfdata(ctx->control, dev);
 592         usb_set_intfdata(ctx->intf, dev);
 593
 594         temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
 595         if (temp)
 596                 goto error2;
 597
 598         dev_info(&dev->udev->dev, "MAC-Address: "
 599                                 "0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
 600                                 dev->net->dev_addr[0], dev->net->dev_addr[1],
 601                                 dev->net->dev_addr[2], dev->net->dev_addr[3],
 602                                 dev->net->dev_addr[4], dev->net->dev_addr[5]);
 603
 604         dev->in = usb_rcvbulkpipe(dev->udev,
 605                 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 606         dev->out = usb_sndbulkpipe(dev->udev,
 607                 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 608         dev->status = ctx->status_ep;
 609         dev->rx_urb_size = ctx->rx_max;
 610
 611         /*
 612          * We should get an event when network connection is "connected" or
 613          * "disconnected". Set network connection in "disconnected" state
 614          * (carrier is OFF) during attach, so the IP network stack does not
 615          * start IPv6 negotiation and more.
 616          */
 617         netif_carrier_off(dev->net);
 618         ctx->tx_speed = ctx->rx_speed = 0;
 619         return 0;
 620
 621 error2:
 622         usb_set_intfdata(ctx->control, NULL);
 623         usb_set_intfdata(ctx->data, NULL);
 624         usb_driver_release_interface(driver, ctx->data);
 625 error:
 626         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
 627         dev->data[0] = 0;
 628         dev_info(&dev->udev->dev, "bind() failure\n");
 629         return -ENODEV;
 630 }
 631
 632 static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
 633 {
 634         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 635         struct usb_driver *driver = driver_of(intf);
 636
 637         if (ctx == NULL)
 638                 return;         /* no setup */
 639
 640         /* disconnect master --> disconnect slave */
 641         if (intf == ctx->control && ctx->data) {
 642                 usb_set_intfdata(ctx->data, NULL);
 643                 usb_driver_release_interface(driver, ctx->data);
 644                 ctx->data = NULL;
 645
 646         } else if (intf == ctx->data && ctx->control) {
 647                 usb_set_intfdata(ctx->control, NULL);
 648                 usb_driver_release_interface(driver, ctx->control);
 649                 ctx->control = NULL;
 650         }
 651
 652         usb_set_intfdata(ctx->intf, NULL);
 653         cdc_ncm_free(ctx);
 654 }
 655
 656 static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
 657 {
 658         if (first >= max)
 659                 return;
 660         if (first >= end)
 661                 return;
 662         if (end > max)
 663                 end = max;
 664         memset(ptr + first, 0, end - first);
 665 }
 666
 667 static struct sk_buff *
 668 cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
 669 {
 670         struct sk_buff *skb_out;
 671         u32 rem;
 672         u32 offset;
 673         u32 last_offset;
 674         u16 n = 0;
 675         u8 ready2send = 0;
 676
 677         /* if there is a remaining skb, it gets priority */
 678         if (skb != NULL)
 679                 swap(skb, ctx->tx_rem_skb);
 680         else
 681                 ready2send = 1;
 682
 683         /*
 684          * +----------------+
 685          * | skb_out        |
 686          * +----------------+
 687          *           ^ offset
 688          *        ^ last_offset
 689          */
 690
 691         /* check if we are resuming an OUT skb */
 692         if (ctx->tx_curr_skb != NULL) {
 693                 /* pop variables */
 694                 skb_out = ctx->tx_curr_skb;
 695                 offset = ctx->tx_curr_offset;
 696                 last_offset = ctx->tx_curr_last_offset;
 697                 n = ctx->tx_curr_frame_num;
 698
 699         } else {
 700                 /* reset variables */
 701                 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
 702                 if (skb_out == NULL) {
 703                         if (skb != NULL) {
 704                                 dev_kfree_skb_any(skb);
 705                                 ctx->netdev->stats.tx_dropped++;
 706                         }
 707                         goto exit_no_skb;
 708                 }
 709
 710                 /* make room for NTH and NDP */
 711                 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
 712                                         ctx->tx_ndp_modulus) +
 713                                         sizeof(struct usb_cdc_ncm_ndp16) +
 714                                         (ctx->tx_max_datagrams + 1) *
 715                                         sizeof(struct usb_cdc_ncm_dpe16);
 716
 717                 /* store last valid offset before alignment */
 718                 last_offset = offset;
 719                 /* align first Datagram offset correctly */
 720                 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
 721                 /* zero buffer till the first IP datagram */
 722                 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
 723                 n = 0;
 724                 ctx->tx_curr_frame_num = 0;
 725         }
 726
 727         for (; n < ctx->tx_max_datagrams; n++) {
 728                 /* check if end of transmit buffer is reached */
 729                 if (offset >= ctx->tx_max) {
 730                         ready2send = 1;
 731                         break;
 732                 }
 733                 /* compute maximum buffer size */
 734                 rem = ctx->tx_max - offset;
 735
 736                 if (skb == NULL) {
 737                         skb = ctx->tx_rem_skb;
 738                         ctx->tx_rem_skb = NULL;
 739
 740                         /* check for end of skb */
 741                         if (skb == NULL)
 742                                 break;
 743                 }
 744
 745                 if (skb->len > rem) {
 746                         if (n == 0) {
 747                                 /* won't fit, MTU problem? */
 748                                 dev_kfree_skb_any(skb);
 749                                 skb = NULL;
 750                                 ctx->netdev->stats.tx_dropped++;
 751                         } else {
 752                                 /* no room for skb - store for later */
 753                                 if (ctx->tx_rem_skb != NULL) {
 754                                         dev_kfree_skb_any(ctx->tx_rem_skb);
 755                                         ctx->netdev->stats.tx_dropped++;
 756                                 }
 757                                 ctx->tx_rem_skb = skb;
 758                                 skb = NULL;
 759                                 ready2send = 1;
 760                         }
 761                         break;
 762                 }
 763
 764                 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
 765
 766                 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
 767                 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
 768
 769                 /* update offset */
 770                 offset += skb->len;
 771
 772                 /* store last valid offset before alignment */
 773                 last_offset = offset;
 774
 775                 /* align offset correctly */
 776                 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
 777
 778                 /* zero padding */
 779                 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
 780                                                                 ctx->tx_max);
 781                 dev_kfree_skb_any(skb);
 782                 skb = NULL;
 783         }
 784
 785         /* free up any dangling skb */
 786         if (skb != NULL) {
 787                 dev_kfree_skb_any(skb);
 788                 skb = NULL;
 789                 ctx->netdev->stats.tx_dropped++;
 790         }
 791
 792         ctx->tx_curr_frame_num = n;
 793
 794         if (n == 0) {
 795                 /* wait for more frames */
 796                 /* push variables */
 797                 ctx->tx_curr_skb = skb_out;
 798                 ctx->tx_curr_offset = offset;
 799                 ctx->tx_curr_last_offset = last_offset;
 800                 goto exit_no_skb;
 801
 802         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
 803                 /* wait for more frames */
 804                 /* push variables */
 805                 ctx->tx_curr_skb = skb_out;
 806                 ctx->tx_curr_offset = offset;
 807                 ctx->tx_curr_last_offset = last_offset;
 808                 /* set the pending count */
 809                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
 810                         ctx->tx_timer_pending = 2;
 811                 goto exit_no_skb;
 812
 813         } else {
 814                 /* frame goes out */
 815                 /* variables will be reset at next call */
 816         }
 817
 818         /* check for overflow */
 819         if (last_offset > ctx->tx_max)
 820                 last_offset = ctx->tx_max;
 821
 822         /* revert offset */
 823         offset = last_offset;
 824
 825         /*
 826          * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
 827          * we send buffers as it is. If we get more data, it would be more
 828          * efficient for USB HS mobile device with DMA engine to receive a full
 829          * size NTB, than canceling DMA transfer and receiving a short packet.
 830          */
 831         if (offset > CDC_NCM_MIN_TX_PKT)
 832                 offset = ctx->tx_max;
 833
 834         /* final zero padding */
 835         cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
 836
 837         /* store last offset */
 838         last_offset = offset;
 839
 840         if (((last_offset < ctx->tx_max) && ((last_offset %
 841                         le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
 842             (((last_offset == ctx->tx_max) && ((ctx->tx_max %
 843                 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
 844                 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
 845                 /* force short packet */
 846                 *(((u8 *)skb_out->data) + last_offset) = 0;
 847                 last_offset++;
 848         }
 849
 850         /* zero the rest of the DPEs plus the last NULL entry */
 851         for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
 852                 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
 853                 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
 854         }
 855
 856         /* fill out 16-bit NTB header */
 857         ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
 858         ctx->tx_ncm.nth16.wHeaderLength =
 859                                         cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
 860         ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
 861         ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
 862         ctx->tx_ncm.nth16.wNdpIndex = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
 863                                                         ctx->tx_ndp_modulus);
 864
 865         memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
 866         ctx->tx_seq++;
 867
 868         /* fill out 16-bit NDP table */
 869         ctx->tx_ncm.ndp16.dwSignature =
 870                                 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
 871         rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
 872                                         sizeof(struct usb_cdc_ncm_dpe16));
 873         ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
 874         ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
 875
 876         memcpy(((u8 *)skb_out->data) + ctx->tx_ncm.nth16.wNdpIndex,
 877                                                 &(ctx->tx_ncm.ndp16),
 878                                                 sizeof(ctx->tx_ncm.ndp16));
 879
 880         memcpy(((u8 *)skb_out->data) + ctx->tx_ncm.nth16.wNdpIndex +
 881                                         sizeof(ctx->tx_ncm.ndp16),
 882                                         &(ctx->tx_ncm.dpe16),
 883                                         (ctx->tx_curr_frame_num + 1) *
 884                                         sizeof(struct usb_cdc_ncm_dpe16));
 885
 886         /* set frame length */
 887         skb_put(skb_out, last_offset);
 888
 889         /* return skb */
 890         ctx->tx_curr_skb = NULL;
 891         return skb_out;
 892
 893 exit_no_skb:
 894         return NULL;
 895 }
 896
 897 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
 898 {
 899         /* start timer, if not already started */
 900         if (timer_pending(&ctx->tx_timer) == 0) {
 901                 ctx->tx_timer.function = &cdc_ncm_tx_timeout;
 902                 ctx->tx_timer.data = (unsigned long)ctx;
 903                 ctx->tx_timer.expires = jiffies + ((HZ + 999) / 1000);
 904                 add_timer(&ctx->tx_timer);
 905         }
 906 }
 907
 908 static void cdc_ncm_tx_timeout(unsigned long arg)
 909 {
 910         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)arg;
 911         u8 restart;
 912
 913         spin_lock(&ctx->mtx);
 914         if (ctx->tx_timer_pending != 0) {
 915                 ctx->tx_timer_pending--;
 916                 restart = 1;
 917         } else {
 918                 restart = 0;
 919         }
 920
 921         spin_unlock(&ctx->mtx);
 922
 923         if (restart) {
 924                 spin_lock(&ctx->mtx);
 925                 cdc_ncm_tx_timeout_start(ctx);
 926                 spin_unlock(&ctx->mtx);
 927         } else if (ctx->netdev != NULL) {
 928                 usbnet_start_xmit(NULL, ctx->netdev);
 929         }
 930 }
 931
 932 static struct sk_buff *
 933 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
 934 {
 935         struct sk_buff *skb_out;
 936         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 937         u8 need_timer = 0;
 938
 939         /*
 940          * The Ethernet API we are using does not support transmitting
 941          * multiple Ethernet frames in a single call. This driver will
 942          * accumulate multiple Ethernet frames and send out a larger
 943          * USB frame when the USB buffer is full or when a single jiffies
 944          * timeout happens.
 945          */
 946         if (ctx == NULL)
 947                 goto error;
 948
 949         spin_lock(&ctx->mtx);
 950         skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
 951         if (ctx->tx_curr_skb != NULL)
 952                 need_timer = 1;
 953
 954         /* Start timer, if there is a remaining skb */
 955         if (need_timer)
 956                 cdc_ncm_tx_timeout_start(ctx);
 957
 958         if (skb_out)
 959                 dev->net->stats.tx_packets += ctx->tx_curr_frame_num;
 960
 961         spin_unlock(&ctx->mtx);
 962         return skb_out;
 963
 964 error:
 965         if (skb != NULL)
 966                 dev_kfree_skb_any(skb);
 967
 968         return NULL;
 969 }
 970
 971 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
 972 {
 973         struct sk_buff *skb;
 974         struct cdc_ncm_ctx *ctx;
 975         int sumlen;
 976         int actlen;
 977         int temp;
 978         int nframes;
 979         int x;
 980         int offset;
 981
 982         ctx = (struct cdc_ncm_ctx *)dev->data[0];
 983         if (ctx == NULL)
 984                 goto error;
 985
 986         actlen = skb_in->len;
 987         sumlen = CDC_NCM_NTB_MAX_SIZE_RX;
 988
 989         if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) {
 990                 pr_debug("frame too short\n");
 991                 goto error;
 992         }
 993
 994         memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data),
 995                                                 sizeof(ctx->rx_ncm.nth16));
 996
 997         if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) !=
 998             USB_CDC_NCM_NTH16_SIGN) {
 999                 pr_debug("invalid NTH16 signature <%u>\n",
1000                          le32_to_cpu(ctx->rx_ncm.nth16.dwSignature));
1001                 goto error;
1002         }
1003
1004         temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength);
1005         if (temp > sumlen) {
1006                 pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen);
1007                 goto error;
1008         }
1009
1010         temp = le16_to_cpu(ctx->rx_ncm.nth16.wNdpIndex);
1011         if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) {
1012                 pr_debug("invalid DPT16 index\n");
1013                 goto error;
1014         }
1015
1016         memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp,
1017                                                 sizeof(ctx->rx_ncm.ndp16));
1018
1019         if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) !=
1020             USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1021                 pr_debug("invalid DPT16 signature <%u>\n",
1022                          le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
1023                 goto error;
1024         }
1025
1026         if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) <
1027             USB_CDC_NCM_NDP16_LENGTH_MIN) {
1028                 pr_debug("invalid DPT16 length <%u>\n",
1029                          le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature));
1030                 goto error;
1031         }
1032
1033         nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) -
1034                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1035                                         sizeof(struct usb_cdc_ncm_dpe16));
1036         nframes--; /* we process NDP entries except for the last one */
1037
1038         pr_debug("nframes = %u\n", nframes);
1039
1040         temp += sizeof(ctx->rx_ncm.ndp16);
1041
1042         if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) {
1043                 pr_debug("Invalid nframes = %d\n", nframes);
1044                 goto error;
1045         }
1046
1047         if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) {
1048                 pr_debug("Truncating number of frames from %u to %u\n",
1049                                         nframes, CDC_NCM_DPT_DATAGRAMS_MAX);
1050                 nframes = CDC_NCM_DPT_DATAGRAMS_MAX;
1051         }
1052
1053         memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp,
1054                                 nframes * (sizeof(struct usb_cdc_ncm_dpe16)));
1055
1056         for (x = 0; x < nframes; x++) {
1057                 offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex);
1058                 temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength);
1059
1060                 /*
1061                  * CDC NCM ch. 3.7
1062                  * All entries after first NULL entry are to be ignored
1063                  */
1064                 if ((offset == 0) || (temp == 0)) {
1065                         if (!x)
1066                                 goto error; /* empty NTB */
1067                         break;
1068                 }
1069
1070                 /* sanity checking */
1071                 if (((offset + temp) > actlen) ||
1072                     (temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) {
1073                         pr_debug("invalid frame detected (ignored)"
1074                                         "offset[%u]=%u, length=%u, skb=%p\n",
1075                                         x, offset, temp, skb_in);
1076                         if (!x)
1077                                 goto error;
1078                         break;
1079
1080                 } else {
1081                         skb = skb_clone(skb_in, GFP_ATOMIC);
1082                         if (!skb)
1083                                 goto error;
1084                         skb->len = temp;
1085                         skb->data = ((u8 *)skb_in->data) + offset;
1086                         skb_set_tail_pointer(skb, temp);
1087                         usbnet_skb_return(dev, skb);
1088                 }
1089         }
1090         return 1;
1091 error:
1092         return 0;
1093 }
1094
1095 static void
1096 cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
1097                      struct usb_cdc_speed_change *data)
1098 {
1099         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1100         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1101
1102         /*
1103          * Currently the USB-NET API does not support reporting the actual
1104          * device speed. Do print it instead.
1105          */
1106         if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1107                 ctx->tx_speed = tx_speed;
1108                 ctx->rx_speed = rx_speed;
1109
1110                 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1111                         printk(KERN_INFO KBUILD_MODNAME
1112                                 ": %s: %u mbit/s downlink "
1113                                 "%u mbit/s uplink\n",
1114                                 ctx->netdev->name,
1115                                 (unsigned int)(rx_speed / 1000000U),
1116                                 (unsigned int)(tx_speed / 1000000U));
1117                 } else {
1118                         printk(KERN_INFO KBUILD_MODNAME
1119                                 ": %s: %u kbit/s downlink "
1120                                 "%u kbit/s uplink\n",
1121                                 ctx->netdev->name,
1122                                 (unsigned int)(rx_speed / 1000U),
1123                                 (unsigned int)(tx_speed / 1000U));
1124                 }
1125         }
1126 }
1127
1128 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1129 {
1130         struct cdc_ncm_ctx *ctx;
1131         struct usb_cdc_notification *event;
1132
1133         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1134
1135         if (urb->actual_length < sizeof(*event))
1136                 return;
1137
1138         /* test for split data in 8-byte chunks */
1139         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1140                 cdc_ncm_speed_change(ctx,
1141                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1142                 return;
1143         }
1144
1145         event = urb->transfer_buffer;
1146
1147         switch (event->bNotificationType) {
1148         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1149                 /*
1150                  * According to the CDC NCM specification ch.7.1
1151                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1152                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1153                  */
1154                 ctx->connected = event->wValue;
1155
1156                 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1157                         " %sconnected\n",
1158                         ctx->netdev->name, ctx->connected ? "" : "dis");
1159
1160                 if (ctx->connected)
1161                         netif_carrier_on(dev->net);
1162                 else {
1163                         netif_carrier_off(dev->net);
1164                         ctx->tx_speed = ctx->rx_speed = 0;
1165                 }
1166                 break;
1167
1168         case USB_CDC_NOTIFY_SPEED_CHANGE:
1169                 if (urb->actual_length < (sizeof(*event) +
1170                                         sizeof(struct usb_cdc_speed_change)))
1171                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1172                 else
1173                         cdc_ncm_speed_change(ctx,
1174                                 (struct usb_cdc_speed_change *) &event[1]);
1175                 break;
1176
1177         default:
1178                 dev_err(&dev->udev->dev, "NCM: unexpected "
1179                         "notification 0x%02x!\n", event->bNotificationType);
1180                 break;
1181         }
1182 }
1183
1184 static int cdc_ncm_check_connect(struct usbnet *dev)
1185 {
1186         struct cdc_ncm_ctx *ctx;
1187
1188         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1189         if (ctx == NULL)
1190                 return 1;       /* disconnected */
1191
1192         return !ctx->connected;
1193 }
1194
1195 static int
1196 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1197 {
1198         return usbnet_probe(udev, prod);
1199 }
1200
1201 static void cdc_ncm_disconnect(struct usb_interface *intf)
1202 {
1203         struct usbnet *dev = usb_get_intfdata(intf);
1204
1205         if (dev == NULL)
1206                 return;         /* already disconnected */
1207
1208         usbnet_disconnect(intf);
1209 }
1210
1211 static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1212 {
1213         dev->intf->needs_remote_wakeup = status;
1214         return 0;
1215 }
1216
1217 static const struct driver_info cdc_ncm_info = {
1218         .description = "CDC NCM",
1219         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1220         .bind = cdc_ncm_bind,
1221         .unbind = cdc_ncm_unbind,
1222         .check_connect = cdc_ncm_check_connect,
1223         .manage_power = cdc_ncm_manage_power,
1224         .status = cdc_ncm_status,
1225         .rx_fixup = cdc_ncm_rx_fixup,
1226         .tx_fixup = cdc_ncm_tx_fixup,
1227 };
1228
1229 static struct usb_driver cdc_ncm_driver = {
1230         .name = "cdc_ncm",
1231         .id_table = cdc_devs,
1232         .probe = cdc_ncm_probe,
1233         .disconnect = cdc_ncm_disconnect,
1234         .suspend = usbnet_suspend,
1235         .resume = usbnet_resume,
1236         .reset_resume = usbnet_resume,
1237         .supports_autosuspend = 1,
1238 };
1239
1240 static struct ethtool_ops cdc_ncm_ethtool_ops = {
1241         .get_drvinfo = cdc_ncm_get_drvinfo,
1242         .get_link = usbnet_get_link,
1243         .get_msglevel = usbnet_get_msglevel,
1244         .set_msglevel = usbnet_set_msglevel,
1245         .get_settings = usbnet_get_settings,
1246         .set_settings = usbnet_set_settings,
1247         .nway_reset = usbnet_nway_reset,
1248 };
1249
1250 static int __init cdc_ncm_init(void)
1251 {
1252         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION "\n");
1253         return usb_register(&cdc_ncm_driver);
1254 }
1255
1256 module_init(cdc_ncm_init);
1257
1258 static void __exit cdc_ncm_exit(void)
1259 {
1260         usb_deregister(&cdc_ncm_driver);
1261 }
1262
1263 module_exit(cdc_ncm_exit);
1264
1265 MODULE_AUTHOR("Hans Petter Selasky");
1266 MODULE_DESCRIPTION("USB CDC NCM host driver");
1267 MODULE_LICENSE("Dual BSD/GPL");