drivers/net/usb/cdc_ncm.c

   1 /*
   2  * cdc_ncm.c
   3  *
   4  * Copyright (C) ST-Ericsson 2010-2012
   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/hrtimer.h>
  51 #include <linux/atomic.h>
  52 #include <linux/usb/usbnet.h>
  53 #include <linux/usb/cdc.h>
  54
  55 #define DRIVER_VERSION                          "14-Mar-2012"
  56
  57 /* CDC NCM subclass 3.2.1 */
  58 #define USB_CDC_NCM_NDP16_LENGTH_MIN            0x10
  59
  60 /* Maximum NTB length */
  61 #define CDC_NCM_NTB_MAX_SIZE_TX                 32768   /* bytes */
  62 #define CDC_NCM_NTB_MAX_SIZE_RX                 32768   /* bytes */
  63
  64 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
  65 #define CDC_NCM_MIN_DATAGRAM_SIZE               1514    /* bytes */
  66
  67 #define CDC_NCM_MIN_TX_PKT                      512     /* bytes */
  68
  69 /* Default value for MaxDatagramSize */
  70 #define CDC_NCM_MAX_DATAGRAM_SIZE               8192    /* bytes */
  71
  72 /*
  73  * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
  74  * the last NULL entry.
  75  */
  76 #define CDC_NCM_DPT_DATAGRAMS_MAX               40
  77
  78 /* Restart the timer, if amount of datagrams is less than given value */
  79 #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT      3
  80 #define CDC_NCM_TIMER_PENDING_CNT               2
  81 #define CDC_NCM_TIMER_INTERVAL                  (400UL * NSEC_PER_USEC)
  82
  83 /* The following macro defines the minimum header space */
  84 #define CDC_NCM_MIN_HDR_SIZE \
  85         (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
  86         (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
  87
  88 struct cdc_ncm_data {
  89         struct usb_cdc_ncm_nth16 nth16;
  90         struct usb_cdc_ncm_ndp16 ndp16;
  91         struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
  92 };
  93
  94 struct cdc_ncm_ctx {
  95         struct cdc_ncm_data tx_ncm;
  96         struct usb_cdc_ncm_ntb_parameters ncm_parm;
  97         struct hrtimer tx_timer;
  98         struct tasklet_struct bh;
  99
 100         const struct usb_cdc_ncm_desc *func_desc;
 101         const struct usb_cdc_header_desc *header_desc;
 102         const struct usb_cdc_union_desc *union_desc;
 103         const struct usb_cdc_ether_desc *ether_desc;
 104
 105         struct net_device *netdev;
 106         struct usb_device *udev;
 107         struct usb_host_endpoint *in_ep;
 108         struct usb_host_endpoint *out_ep;
 109         struct usb_host_endpoint *status_ep;
 110         struct usb_interface *intf;
 111         struct usb_interface *control;
 112         struct usb_interface *data;
 113
 114         struct sk_buff *tx_curr_skb;
 115         struct sk_buff *tx_rem_skb;
 116
 117         spinlock_t mtx;
 118         atomic_t stop;
 119
 120         u32 tx_timer_pending;
 121         u32 tx_curr_offset;
 122         u32 tx_curr_last_offset;
 123         u32 tx_curr_frame_num;
 124         u32 rx_speed;
 125         u32 tx_speed;
 126         u32 rx_max;
 127         u32 tx_max;
 128         u32 max_datagram_size;
 129         u16 tx_max_datagrams;
 130         u16 tx_remainder;
 131         u16 tx_modulus;
 132         u16 tx_ndp_modulus;
 133         u16 tx_seq;
 134         u16 rx_seq;
 135         u16 connected;
 136 };
 137
 138 static void cdc_ncm_txpath_bh(unsigned long param);
 139 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
 140 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
 141 static const struct driver_info cdc_ncm_info;
 142 static struct usb_driver cdc_ncm_driver;
 143 static const struct ethtool_ops cdc_ncm_ethtool_ops;
 144
 145 static const struct usb_device_id cdc_devs[] = {
 146         { USB_INTERFACE_INFO(USB_CLASS_COMM,
 147                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
 148                 .driver_info = (unsigned long)&cdc_ncm_info,
 149         },
 150         {
 151         },
 152 };
 153
 154 MODULE_DEVICE_TABLE(usb, cdc_devs);
 155
 156 static void
 157 cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
 158 {
 159         struct usbnet *dev = netdev_priv(net);
 160
 161         strncpy(info->driver, dev->driver_name, sizeof(info->driver));
 162         strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
 163         strncpy(info->fw_version, dev->driver_info->description,
 164                 sizeof(info->fw_version));
 165         usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
 166 }
 167
 168 static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
 169 {
 170         u32 val;
 171         u8 flags;
 172         u8 iface_no;
 173         int err;
 174         u16 ntb_fmt_supported;
 175
 176         iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 177
 178         err = usb_control_msg(ctx->udev,
 179                                 usb_rcvctrlpipe(ctx->udev, 0),
 180                                 USB_CDC_GET_NTB_PARAMETERS,
 181                                 USB_TYPE_CLASS | USB_DIR_IN
 182                                  | USB_RECIP_INTERFACE,
 183                                 0, iface_no, &ctx->ncm_parm,
 184                                 sizeof(ctx->ncm_parm), 10000);
 185         if (err < 0) {
 186                 pr_debug("failed GET_NTB_PARAMETERS\n");
 187                 return 1;
 188         }
 189
 190         /* read correct set of parameters according to device mode */
 191         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
 192         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
 193         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
 194         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
 195         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
 196         /* devices prior to NCM Errata shall set this field to zero */
 197         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
 198         ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
 199
 200         if (ctx->func_desc != NULL)
 201                 flags = ctx->func_desc->bmNetworkCapabilities;
 202         else
 203                 flags = 0;
 204
 205         pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
 206                  "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
 207                  "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
 208                  ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
 209                  ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
 210
 211         /* max count of tx datagrams */
 212         if ((ctx->tx_max_datagrams == 0) ||
 213                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
 214                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
 215
 216         /* verify maximum size of received NTB in bytes */
 217         if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
 218                 pr_debug("Using min receive length=%d\n",
 219                                                 USB_CDC_NCM_NTB_MIN_IN_SIZE);
 220                 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
 221         }
 222
 223         if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
 224                 pr_debug("Using default maximum receive length=%d\n",
 225                                                 CDC_NCM_NTB_MAX_SIZE_RX);
 226                 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
 227         }
 228
 229         /* inform device about NTB input size changes */
 230         if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
 231
 232                 if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
 233                         struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
 234
 235                         ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
 236                         if (!ndp_in_sz) {
 237                                 err = -ENOMEM;
 238                                 goto size_err;
 239                         }
 240
 241                         err = usb_control_msg(ctx->udev,
 242                                         usb_sndctrlpipe(ctx->udev, 0),
 243                                         USB_CDC_SET_NTB_INPUT_SIZE,
 244                                         USB_TYPE_CLASS | USB_DIR_OUT
 245                                          | USB_RECIP_INTERFACE,
 246                                         0, iface_no, ndp_in_sz, 8, 1000);
 247                         kfree(ndp_in_sz);
 248                 } else {
 249                         __le32 *dwNtbInMaxSize;
 250                         dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
 251                                         GFP_KERNEL);
 252                         if (!dwNtbInMaxSize) {
 253                                 err = -ENOMEM;
 254                                 goto size_err;
 255                         }
 256                         *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
 257
 258                         err = usb_control_msg(ctx->udev,
 259                                         usb_sndctrlpipe(ctx->udev, 0),
 260                                         USB_CDC_SET_NTB_INPUT_SIZE,
 261                                         USB_TYPE_CLASS | USB_DIR_OUT
 262                                          | USB_RECIP_INTERFACE,
 263                                         0, iface_no, dwNtbInMaxSize, 4, 1000);
 264                         kfree(dwNtbInMaxSize);
 265                 }
 266 size_err:
 267                 if (err < 0)
 268                         pr_debug("Setting NTB Input Size failed\n");
 269         }
 270
 271         /* verify maximum size of transmitted NTB in bytes */
 272         if ((ctx->tx_max <
 273             (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
 274             (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
 275                 pr_debug("Using default maximum transmit length=%d\n",
 276                                                 CDC_NCM_NTB_MAX_SIZE_TX);
 277                 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
 278         }
 279
 280         /*
 281          * verify that the structure alignment is:
 282          * - power of two
 283          * - not greater than the maximum transmit length
 284          * - not less than four bytes
 285          */
 286         val = ctx->tx_ndp_modulus;
 287
 288         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 289             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 290                 pr_debug("Using default alignment: 4 bytes\n");
 291                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 292         }
 293
 294         /*
 295          * verify that the payload alignment is:
 296          * - power of two
 297          * - not greater than the maximum transmit length
 298          * - not less than four bytes
 299          */
 300         val = ctx->tx_modulus;
 301
 302         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 303             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 304                 pr_debug("Using default transmit modulus: 4 bytes\n");
 305                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 306         }
 307
 308         /* verify the payload remainder */
 309         if (ctx->tx_remainder >= ctx->tx_modulus) {
 310                 pr_debug("Using default transmit remainder: 0 bytes\n");
 311                 ctx->tx_remainder = 0;
 312         }
 313
 314         /* adjust TX-remainder according to NCM specification. */
 315         ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
 316                                                 (ctx->tx_modulus - 1));
 317
 318         /* additional configuration */
 319
 320         /* set CRC Mode */
 321         if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
 322                 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
 323                                 USB_CDC_SET_CRC_MODE,
 324                                 USB_TYPE_CLASS | USB_DIR_OUT
 325                                  | USB_RECIP_INTERFACE,
 326                                 USB_CDC_NCM_CRC_NOT_APPENDED,
 327                                 iface_no, NULL, 0, 1000);
 328                 if (err < 0)
 329                         pr_debug("Setting CRC mode off failed\n");
 330         }
 331
 332         /* set NTB format, if both formats are supported */
 333         if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
 334                 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
 335                                 USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
 336                                  | USB_DIR_OUT | USB_RECIP_INTERFACE,
 337                                 USB_CDC_NCM_NTB16_FORMAT,
 338                                 iface_no, NULL, 0, 1000);
 339                 if (err < 0)
 340                         pr_debug("Setting NTB format to 16-bit failed\n");
 341         }
 342
 343         ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
 344
 345         /* set Max Datagram Size (MTU) */
 346         if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
 347                 __le16 *max_datagram_size;
 348                 u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
 349
 350                 max_datagram_size = kzalloc(sizeof(*max_datagram_size),
 351                                 GFP_KERNEL);
 352                 if (!max_datagram_size) {
 353                         err = -ENOMEM;
 354                         goto max_dgram_err;
 355                 }
 356
 357                 err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
 358                                 USB_CDC_GET_MAX_DATAGRAM_SIZE,
 359                                 USB_TYPE_CLASS | USB_DIR_IN
 360                                  | USB_RECIP_INTERFACE,
 361                                 0, iface_no, max_datagram_size,
 362                                 2, 1000);
 363                 if (err < 0) {
 364                         pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
 365                                                 CDC_NCM_MIN_DATAGRAM_SIZE);
 366                 } else {
 367                         ctx->max_datagram_size =
 368                                 le16_to_cpu(*max_datagram_size);
 369                         /* Check Eth descriptor value */
 370                         if (ctx->max_datagram_size > eth_max_sz)
 371                                         ctx->max_datagram_size = eth_max_sz;
 372
 373                         if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
 374                                 ctx->max_datagram_size =
 375                                                 CDC_NCM_MAX_DATAGRAM_SIZE;
 376
 377                         if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE)
 378                                 ctx->max_datagram_size =
 379                                         CDC_NCM_MIN_DATAGRAM_SIZE;
 380
 381                         /* if value changed, update device */
 382                         if (ctx->max_datagram_size !=
 383                                         le16_to_cpu(*max_datagram_size)) {
 384                                 err = usb_control_msg(ctx->udev,
 385                                                 usb_sndctrlpipe(ctx->udev, 0),
 386                                                 USB_CDC_SET_MAX_DATAGRAM_SIZE,
 387                                                 USB_TYPE_CLASS | USB_DIR_OUT
 388                                                  | USB_RECIP_INTERFACE,
 389                                                 0,
 390                                                 iface_no, max_datagram_size,
 391                                                 2, 1000);
 392                                 if (err < 0)
 393                                         pr_debug("SET_MAX_DGRAM_SIZE failed\n");
 394                         }
 395                 }
 396                 kfree(max_datagram_size);
 397         }
 398
 399 max_dgram_err:
 400         if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
 401                 ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
 402
 403         return 0;
 404 }
 405
 406 static void
 407 cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
 408 {
 409         struct usb_host_endpoint *e;
 410         u8 ep;
 411
 412         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
 413
 414                 e = intf->cur_altsetting->endpoint + ep;
 415                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 416                 case USB_ENDPOINT_XFER_INT:
 417                         if (usb_endpoint_dir_in(&e->desc)) {
 418                                 if (ctx->status_ep == NULL)
 419                                         ctx->status_ep = e;
 420                         }
 421                         break;
 422
 423                 case USB_ENDPOINT_XFER_BULK:
 424                         if (usb_endpoint_dir_in(&e->desc)) {
 425                                 if (ctx->in_ep == NULL)
 426                                         ctx->in_ep = e;
 427                         } else {
 428                                 if (ctx->out_ep == NULL)
 429                                         ctx->out_ep = e;
 430                         }
 431                         break;
 432
 433                 default:
 434                         break;
 435                 }
 436         }
 437 }
 438
 439 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
 440 {
 441         if (ctx == NULL)
 442                 return;
 443
 444         if (ctx->tx_rem_skb != NULL) {
 445                 dev_kfree_skb_any(ctx->tx_rem_skb);
 446                 ctx->tx_rem_skb = NULL;
 447         }
 448
 449         if (ctx->tx_curr_skb != NULL) {
 450                 dev_kfree_skb_any(ctx->tx_curr_skb);
 451                 ctx->tx_curr_skb = NULL;
 452         }
 453
 454         kfree(ctx);
 455 }
 456
 457 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
 458 {
 459         struct cdc_ncm_ctx *ctx;
 460         struct usb_driver *driver;
 461         u8 *buf;
 462         int len;
 463         int temp;
 464         u8 iface_no;
 465
 466         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 467         if (ctx == NULL)
 468                 return -ENODEV;
 469
 470         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 471         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
 472         ctx->bh.data = (unsigned long)ctx;
 473         ctx->bh.func = cdc_ncm_txpath_bh;
 474         atomic_set(&ctx->stop, 0);
 475         spin_lock_init(&ctx->mtx);
 476         ctx->netdev = dev->net;
 477
 478         /* store ctx pointer in device data field */
 479         dev->data[0] = (unsigned long)ctx;
 480
 481         /* get some pointers */
 482         driver = driver_of(intf);
 483         buf = intf->cur_altsetting->extra;
 484         len = intf->cur_altsetting->extralen;
 485
 486         ctx->udev = dev->udev;
 487         ctx->intf = intf;
 488
 489         /* parse through descriptors associated with control interface */
 490         while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
 491
 492                 if (buf[1] != USB_DT_CS_INTERFACE)
 493                         goto advance;
 494
 495                 switch (buf[2]) {
 496                 case USB_CDC_UNION_TYPE:
 497                         if (buf[0] < sizeof(*(ctx->union_desc)))
 498                                 break;
 499
 500                         ctx->union_desc =
 501                                         (const struct usb_cdc_union_desc *)buf;
 502
 503                         ctx->control = usb_ifnum_to_if(dev->udev,
 504                                         ctx->union_desc->bMasterInterface0);
 505                         ctx->data = usb_ifnum_to_if(dev->udev,
 506                                         ctx->union_desc->bSlaveInterface0);
 507                         break;
 508
 509                 case USB_CDC_ETHERNET_TYPE:
 510                         if (buf[0] < sizeof(*(ctx->ether_desc)))
 511                                 break;
 512
 513                         ctx->ether_desc =
 514                                         (const struct usb_cdc_ether_desc *)buf;
 515                         dev->hard_mtu =
 516                                 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
 517
 518                         if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
 519                                 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
 520                         else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
 521                                 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
 522                         break;
 523
 524                 case USB_CDC_NCM_TYPE:
 525                         if (buf[0] < sizeof(*(ctx->func_desc)))
 526                                 break;
 527
 528                         ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
 529                         break;
 530
 531                 default:
 532                         break;
 533                 }
 534 advance:
 535                 /* advance to next descriptor */
 536                 temp = buf[0];
 537                 buf += temp;
 538                 len -= temp;
 539         }
 540
 541         /* check if we got everything */
 542         if ((ctx->control == NULL) || (ctx->data == NULL) ||
 543             (ctx->ether_desc == NULL) || (ctx->control != intf))
 544                 goto error;
 545
 546         /* claim interfaces, if any */
 547         temp = usb_driver_claim_interface(driver, ctx->data, dev);
 548         if (temp)
 549                 goto error;
 550
 551         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
 552
 553         /* reset data interface */
 554         temp = usb_set_interface(dev->udev, iface_no, 0);
 555         if (temp)
 556                 goto error2;
 557
 558         /* initialize data interface */
 559         if (cdc_ncm_setup(ctx))
 560                 goto error2;
 561
 562         /* configure data interface */
 563         temp = usb_set_interface(dev->udev, iface_no, 1);
 564         if (temp)
 565                 goto error2;
 566
 567         cdc_ncm_find_endpoints(ctx, ctx->data);
 568         cdc_ncm_find_endpoints(ctx, ctx->control);
 569
 570         if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
 571             (ctx->status_ep == NULL))
 572                 goto error2;
 573
 574         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
 575
 576         usb_set_intfdata(ctx->data, dev);
 577         usb_set_intfdata(ctx->control, dev);
 578         usb_set_intfdata(ctx->intf, dev);
 579
 580         temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
 581         if (temp)
 582                 goto error2;
 583
 584         dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
 585
 586         dev->in = usb_rcvbulkpipe(dev->udev,
 587                 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 588         dev->out = usb_sndbulkpipe(dev->udev,
 589                 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 590         dev->status = ctx->status_ep;
 591         dev->rx_urb_size = ctx->rx_max;
 592
 593         /*
 594          * We should get an event when network connection is "connected" or
 595          * "disconnected". Set network connection in "disconnected" state
 596          * (carrier is OFF) during attach, so the IP network stack does not
 597          * start IPv6 negotiation and more.
 598          */
 599         netif_carrier_off(dev->net);
 600         ctx->tx_speed = ctx->rx_speed = 0;
 601         return 0;
 602
 603 error2:
 604         usb_set_intfdata(ctx->control, NULL);
 605         usb_set_intfdata(ctx->data, NULL);
 606         usb_driver_release_interface(driver, ctx->data);
 607 error:
 608         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
 609         dev->data[0] = 0;
 610         dev_info(&dev->udev->dev, "bind() failure\n");
 611         return -ENODEV;
 612 }
 613
 614 static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
 615 {
 616         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 617         struct usb_driver *driver = driver_of(intf);
 618
 619         if (ctx == NULL)
 620                 return;         /* no setup */
 621
 622         atomic_set(&ctx->stop, 1);
 623
 624         if (hrtimer_active(&ctx->tx_timer))
 625                 hrtimer_cancel(&ctx->tx_timer);
 626
 627         tasklet_kill(&ctx->bh);
 628
 629         /* disconnect master --> disconnect slave */
 630         if (intf == ctx->control && ctx->data) {
 631                 usb_set_intfdata(ctx->data, NULL);
 632                 usb_driver_release_interface(driver, ctx->data);
 633                 ctx->data = NULL;
 634
 635         } else if (intf == ctx->data && ctx->control) {
 636                 usb_set_intfdata(ctx->control, NULL);
 637                 usb_driver_release_interface(driver, ctx->control);
 638                 ctx->control = NULL;
 639         }
 640
 641         usb_set_intfdata(ctx->intf, NULL);
 642         cdc_ncm_free(ctx);
 643 }
 644
 645 static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
 646 {
 647         if (first >= max)
 648                 return;
 649         if (first >= end)
 650                 return;
 651         if (end > max)
 652                 end = max;
 653         memset(ptr + first, 0, end - first);
 654 }
 655
 656 static struct sk_buff *
 657 cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
 658 {
 659         struct sk_buff *skb_out;
 660         u32 rem;
 661         u32 offset;
 662         u32 last_offset;
 663         u16 n = 0, index;
 664         u8 ready2send = 0;
 665
 666         /* if there is a remaining skb, it gets priority */
 667         if (skb != NULL)
 668                 swap(skb, ctx->tx_rem_skb);
 669         else
 670                 ready2send = 1;
 671
 672         /*
 673          * +----------------+
 674          * | skb_out        |
 675          * +----------------+
 676          *           ^ offset
 677          *        ^ last_offset
 678          */
 679
 680         /* check if we are resuming an OUT skb */
 681         if (ctx->tx_curr_skb != NULL) {
 682                 /* pop variables */
 683                 skb_out = ctx->tx_curr_skb;
 684                 offset = ctx->tx_curr_offset;
 685                 last_offset = ctx->tx_curr_last_offset;
 686                 n = ctx->tx_curr_frame_num;
 687
 688         } else {
 689                 /* reset variables */
 690                 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
 691                 if (skb_out == NULL) {
 692                         if (skb != NULL) {
 693                                 dev_kfree_skb_any(skb);
 694                                 ctx->netdev->stats.tx_dropped++;
 695                         }
 696                         goto exit_no_skb;
 697                 }
 698
 699                 /* make room for NTH and NDP */
 700                 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
 701                                         ctx->tx_ndp_modulus) +
 702                                         sizeof(struct usb_cdc_ncm_ndp16) +
 703                                         (ctx->tx_max_datagrams + 1) *
 704                                         sizeof(struct usb_cdc_ncm_dpe16);
 705
 706                 /* store last valid offset before alignment */
 707                 last_offset = offset;
 708                 /* align first Datagram offset correctly */
 709                 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
 710                 /* zero buffer till the first IP datagram */
 711                 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
 712                 n = 0;
 713                 ctx->tx_curr_frame_num = 0;
 714         }
 715
 716         for (; n < ctx->tx_max_datagrams; n++) {
 717                 /* check if end of transmit buffer is reached */
 718                 if (offset >= ctx->tx_max) {
 719                         ready2send = 1;
 720                         break;
 721                 }
 722                 /* compute maximum buffer size */
 723                 rem = ctx->tx_max - offset;
 724
 725                 if (skb == NULL) {
 726                         skb = ctx->tx_rem_skb;
 727                         ctx->tx_rem_skb = NULL;
 728
 729                         /* check for end of skb */
 730                         if (skb == NULL)
 731                                 break;
 732                 }
 733
 734                 if (skb->len > rem) {
 735                         if (n == 0) {
 736                                 /* won't fit, MTU problem? */
 737                                 dev_kfree_skb_any(skb);
 738                                 skb = NULL;
 739                                 ctx->netdev->stats.tx_dropped++;
 740                         } else {
 741                                 /* no room for skb - store for later */
 742                                 if (ctx->tx_rem_skb != NULL) {
 743                                         dev_kfree_skb_any(ctx->tx_rem_skb);
 744                                         ctx->netdev->stats.tx_dropped++;
 745                                 }
 746                                 ctx->tx_rem_skb = skb;
 747                                 skb = NULL;
 748                                 ready2send = 1;
 749                         }
 750                         break;
 751                 }
 752
 753                 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
 754
 755                 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
 756                 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
 757
 758                 /* update offset */
 759                 offset += skb->len;
 760
 761                 /* store last valid offset before alignment */
 762                 last_offset = offset;
 763
 764                 /* align offset correctly */
 765                 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
 766
 767                 /* zero padding */
 768                 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
 769                                                                 ctx->tx_max);
 770                 dev_kfree_skb_any(skb);
 771                 skb = NULL;
 772         }
 773
 774         /* free up any dangling skb */
 775         if (skb != NULL) {
 776                 dev_kfree_skb_any(skb);
 777                 skb = NULL;
 778                 ctx->netdev->stats.tx_dropped++;
 779         }
 780
 781         ctx->tx_curr_frame_num = n;
 782
 783         if (n == 0) {
 784                 /* wait for more frames */
 785                 /* push variables */
 786                 ctx->tx_curr_skb = skb_out;
 787                 ctx->tx_curr_offset = offset;
 788                 ctx->tx_curr_last_offset = last_offset;
 789                 goto exit_no_skb;
 790
 791         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
 792                 /* wait for more frames */
 793                 /* push variables */
 794                 ctx->tx_curr_skb = skb_out;
 795                 ctx->tx_curr_offset = offset;
 796                 ctx->tx_curr_last_offset = last_offset;
 797                 /* set the pending count */
 798                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
 799                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
 800                 goto exit_no_skb;
 801
 802         } else {
 803                 /* frame goes out */
 804                 /* variables will be reset at next call */
 805         }
 806
 807         /* check for overflow */
 808         if (last_offset > ctx->tx_max)
 809                 last_offset = ctx->tx_max;
 810
 811         /* revert offset */
 812         offset = last_offset;
 813
 814         /*
 815          * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
 816          * we send buffers as it is. If we get more data, it would be more
 817          * efficient for USB HS mobile device with DMA engine to receive a full
 818          * size NTB, than canceling DMA transfer and receiving a short packet.
 819          */
 820         if (offset > CDC_NCM_MIN_TX_PKT)
 821                 offset = ctx->tx_max;
 822
 823         /* final zero padding */
 824         cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
 825
 826         /* store last offset */
 827         last_offset = offset;
 828
 829         if (((last_offset < ctx->tx_max) && ((last_offset %
 830                         le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
 831             (((last_offset == ctx->tx_max) && ((ctx->tx_max %
 832                 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
 833                 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
 834                 /* force short packet */
 835                 *(((u8 *)skb_out->data) + last_offset) = 0;
 836                 last_offset++;
 837         }
 838
 839         /* zero the rest of the DPEs plus the last NULL entry */
 840         for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
 841                 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
 842                 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
 843         }
 844
 845         /* fill out 16-bit NTB header */
 846         ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
 847         ctx->tx_ncm.nth16.wHeaderLength =
 848                                         cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
 849         ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
 850         ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
 851         index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
 852         ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
 853
 854         memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
 855         ctx->tx_seq++;
 856
 857         /* fill out 16-bit NDP table */
 858         ctx->tx_ncm.ndp16.dwSignature =
 859                                 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
 860         rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
 861                                         sizeof(struct usb_cdc_ncm_dpe16));
 862         ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
 863         ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
 864
 865         memcpy(((u8 *)skb_out->data) + index,
 866                                                 &(ctx->tx_ncm.ndp16),
 867                                                 sizeof(ctx->tx_ncm.ndp16));
 868
 869         memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
 870                                         &(ctx->tx_ncm.dpe16),
 871                                         (ctx->tx_curr_frame_num + 1) *
 872                                         sizeof(struct usb_cdc_ncm_dpe16));
 873
 874         /* set frame length */
 875         skb_put(skb_out, last_offset);
 876
 877         /* return skb */
 878         ctx->tx_curr_skb = NULL;
 879         ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
 880         return skb_out;
 881
 882 exit_no_skb:
 883         /* Start timer, if there is a remaining skb */
 884         if (ctx->tx_curr_skb != NULL)
 885                 cdc_ncm_tx_timeout_start(ctx);
 886         return NULL;
 887 }
 888
 889 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
 890 {
 891         /* start timer, if not already started */
 892         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
 893                 hrtimer_start(&ctx->tx_timer,
 894                                 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
 895                                 HRTIMER_MODE_REL);
 896 }
 897
 898 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
 899 {
 900         struct cdc_ncm_ctx *ctx =
 901                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
 902
 903         if (!atomic_read(&ctx->stop))
 904                 tasklet_schedule(&ctx->bh);
 905         return HRTIMER_NORESTART;
 906 }
 907
 908 static void cdc_ncm_txpath_bh(unsigned long param)
 909 {
 910         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
 911
 912         spin_lock_bh(&ctx->mtx);
 913         if (ctx->tx_timer_pending != 0) {
 914                 ctx->tx_timer_pending--;
 915                 cdc_ncm_tx_timeout_start(ctx);
 916                 spin_unlock_bh(&ctx->mtx);
 917         } else if (ctx->netdev != NULL) {
 918                 spin_unlock_bh(&ctx->mtx);
 919                 netif_tx_lock_bh(ctx->netdev);
 920                 usbnet_start_xmit(NULL, ctx->netdev);
 921                 netif_tx_unlock_bh(ctx->netdev);
 922         }
 923 }
 924
 925 static struct sk_buff *
 926 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
 927 {
 928         struct sk_buff *skb_out;
 929         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 930
 931         /*
 932          * The Ethernet API we are using does not support transmitting
 933          * multiple Ethernet frames in a single call. This driver will
 934          * accumulate multiple Ethernet frames and send out a larger
 935          * USB frame when the USB buffer is full or when a single jiffies
 936          * timeout happens.
 937          */
 938         if (ctx == NULL)
 939                 goto error;
 940
 941         spin_lock_bh(&ctx->mtx);
 942         skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
 943         spin_unlock_bh(&ctx->mtx);
 944         return skb_out;
 945
 946 error:
 947         if (skb != NULL)
 948                 dev_kfree_skb_any(skb);
 949
 950         return NULL;
 951 }
 952
 953 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
 954 {
 955         struct sk_buff *skb;
 956         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 957         int len;
 958         int nframes;
 959         int x;
 960         int offset;
 961         struct usb_cdc_ncm_nth16 *nth16;
 962         struct usb_cdc_ncm_ndp16 *ndp16;
 963         struct usb_cdc_ncm_dpe16 *dpe16;
 964
 965         if (ctx == NULL)
 966                 goto error;
 967
 968         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
 969                                         sizeof(struct usb_cdc_ncm_ndp16))) {
 970                 pr_debug("frame too short\n");
 971                 goto error;
 972         }
 973
 974         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
 975
 976         if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
 977                 pr_debug("invalid NTH16 signature <%u>\n",
 978                                         le32_to_cpu(nth16->dwSignature));
 979                 goto error;
 980         }
 981
 982         len = le16_to_cpu(nth16->wBlockLength);
 983         if (len > ctx->rx_max) {
 984                 pr_debug("unsupported NTB block length %u/%u\n", len,
 985                                                                 ctx->rx_max);
 986                 goto error;
 987         }
 988
 989         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
 990                 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
 991                 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
 992                 pr_debug("sequence number glitch prev=%d curr=%d\n",
 993                                 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
 994         }
 995         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
 996
 997         len = le16_to_cpu(nth16->wNdpIndex);
 998         if ((len + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
 999                 pr_debug("invalid DPT16 index <%u>\n",
1000                                         le16_to_cpu(nth16->wNdpIndex));
1001                 goto error;
1002         }
1003
1004         ndp16 = (struct usb_cdc_ncm_ndp16 *)(((u8 *)skb_in->data) + len);
1005
1006         if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1007                 pr_debug("invalid DPT16 signature <%u>\n",
1008                                         le32_to_cpu(ndp16->dwSignature));
1009                 goto error;
1010         }
1011
1012         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1013                 pr_debug("invalid DPT16 length <%u>\n",
1014                                         le32_to_cpu(ndp16->dwSignature));
1015                 goto error;
1016         }
1017
1018         nframes = ((le16_to_cpu(ndp16->wLength) -
1019                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1020                                         sizeof(struct usb_cdc_ncm_dpe16));
1021         nframes--; /* we process NDP entries except for the last one */
1022
1023         len += sizeof(struct usb_cdc_ncm_ndp16);
1024
1025         if ((len + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) >
1026                                                                 skb_in->len) {
1027                 pr_debug("Invalid nframes = %d\n", nframes);
1028                 goto error;
1029         }
1030
1031         dpe16 = (struct usb_cdc_ncm_dpe16 *)(((u8 *)skb_in->data) + len);
1032
1033         for (x = 0; x < nframes; x++, dpe16++) {
1034                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1035                 len = le16_to_cpu(dpe16->wDatagramLength);
1036
1037                 /*
1038                  * CDC NCM ch. 3.7
1039                  * All entries after first NULL entry are to be ignored
1040                  */
1041                 if ((offset == 0) || (len == 0)) {
1042                         if (!x)
1043                                 goto error; /* empty NTB */
1044                         break;
1045                 }
1046
1047                 /* sanity checking */
1048                 if (((offset + len) > skb_in->len) ||
1049                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1050                         pr_debug("invalid frame detected (ignored)"
1051                                         "offset[%u]=%u, length=%u, skb=%p\n",
1052                                         x, offset, len, skb_in);
1053                         if (!x)
1054                                 goto error;
1055                         break;
1056
1057                 } else {
1058                         skb = skb_clone(skb_in, GFP_ATOMIC);
1059                         if (!skb)
1060                                 goto error;
1061                         skb->len = len;
1062                         skb->data = ((u8 *)skb_in->data) + offset;
1063                         skb_set_tail_pointer(skb, len);
1064                         usbnet_skb_return(dev, skb);
1065                 }
1066         }
1067         return 1;
1068 error:
1069         return 0;
1070 }
1071
1072 static void
1073 cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
1074                      struct usb_cdc_speed_change *data)
1075 {
1076         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1077         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1078
1079         /*
1080          * Currently the USB-NET API does not support reporting the actual
1081          * device speed. Do print it instead.
1082          */
1083         if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1084                 ctx->tx_speed = tx_speed;
1085                 ctx->rx_speed = rx_speed;
1086
1087                 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1088                         printk(KERN_INFO KBUILD_MODNAME
1089                                 ": %s: %u mbit/s downlink "
1090                                 "%u mbit/s uplink\n",
1091                                 ctx->netdev->name,
1092                                 (unsigned int)(rx_speed / 1000000U),
1093                                 (unsigned int)(tx_speed / 1000000U));
1094                 } else {
1095                         printk(KERN_INFO KBUILD_MODNAME
1096                                 ": %s: %u kbit/s downlink "
1097                                 "%u kbit/s uplink\n",
1098                                 ctx->netdev->name,
1099                                 (unsigned int)(rx_speed / 1000U),
1100                                 (unsigned int)(tx_speed / 1000U));
1101                 }
1102         }
1103 }
1104
1105 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1106 {
1107         struct cdc_ncm_ctx *ctx;
1108         struct usb_cdc_notification *event;
1109
1110         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1111
1112         if (urb->actual_length < sizeof(*event))
1113                 return;
1114
1115         /* test for split data in 8-byte chunks */
1116         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1117                 cdc_ncm_speed_change(ctx,
1118                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1119                 return;
1120         }
1121
1122         event = urb->transfer_buffer;
1123
1124         switch (event->bNotificationType) {
1125         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1126                 /*
1127                  * According to the CDC NCM specification ch.7.1
1128                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1129                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1130                  */
1131                 ctx->connected = event->wValue;
1132
1133                 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1134                         " %sconnected\n",
1135                         ctx->netdev->name, ctx->connected ? "" : "dis");
1136
1137                 if (ctx->connected)
1138                         netif_carrier_on(dev->net);
1139                 else {
1140                         netif_carrier_off(dev->net);
1141                         ctx->tx_speed = ctx->rx_speed = 0;
1142                 }
1143                 break;
1144
1145         case USB_CDC_NOTIFY_SPEED_CHANGE:
1146                 if (urb->actual_length < (sizeof(*event) +
1147                                         sizeof(struct usb_cdc_speed_change)))
1148                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1149                 else
1150                         cdc_ncm_speed_change(ctx,
1151                                 (struct usb_cdc_speed_change *) &event[1]);
1152                 break;
1153
1154         default:
1155                 dev_err(&dev->udev->dev, "NCM: unexpected "
1156                         "notification 0x%02x!\n", event->bNotificationType);
1157                 break;
1158         }
1159 }
1160
1161 static int cdc_ncm_check_connect(struct usbnet *dev)
1162 {
1163         struct cdc_ncm_ctx *ctx;
1164
1165         ctx = (struct cdc_ncm_ctx *)dev->data[0];
1166         if (ctx == NULL)
1167                 return 1;       /* disconnected */
1168
1169         return !ctx->connected;
1170 }
1171
1172 static int
1173 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1174 {
1175         return usbnet_probe(udev, prod);
1176 }
1177
1178 static void cdc_ncm_disconnect(struct usb_interface *intf)
1179 {
1180         struct usbnet *dev = usb_get_intfdata(intf);
1181
1182         if (dev == NULL)
1183                 return;         /* already disconnected */
1184
1185         usbnet_disconnect(intf);
1186 }
1187
1188 static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1189 {
1190         dev->intf->needs_remote_wakeup = status;
1191         return 0;
1192 }
1193
1194 static const struct driver_info cdc_ncm_info = {
1195         .description = "CDC NCM",
1196         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1197         .bind = cdc_ncm_bind,
1198         .unbind = cdc_ncm_unbind,
1199         .check_connect = cdc_ncm_check_connect,
1200         .manage_power = cdc_ncm_manage_power,
1201         .status = cdc_ncm_status,
1202         .rx_fixup = cdc_ncm_rx_fixup,
1203         .tx_fixup = cdc_ncm_tx_fixup,
1204 };
1205
1206 static struct usb_driver cdc_ncm_driver = {
1207         .name = "cdc_ncm",
1208         .id_table = cdc_devs,
1209         .probe = cdc_ncm_probe,
1210         .disconnect = cdc_ncm_disconnect,
1211         .suspend = usbnet_suspend,
1212         .resume = usbnet_resume,
1213         .reset_resume = usbnet_resume,
1214         .supports_autosuspend = 1,
1215 };
1216
1217 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
1218         .get_drvinfo = cdc_ncm_get_drvinfo,
1219         .get_link = usbnet_get_link,
1220         .get_msglevel = usbnet_get_msglevel,
1221         .set_msglevel = usbnet_set_msglevel,
1222         .get_settings = usbnet_get_settings,
1223         .set_settings = usbnet_set_settings,
1224         .nway_reset = usbnet_nway_reset,
1225 };
1226
1227 module_usb_driver(cdc_ncm_driver);
1228
1229 MODULE_AUTHOR("Hans Petter Selasky");
1230 MODULE_DESCRIPTION("USB CDC NCM host driver");
1231 MODULE_LICENSE("Dual BSD/GPL");