drivers/net/usb/sierra_net.c

   1 /*
   2  * USB-to-WWAN Driver for Sierra Wireless modems
   3  *
   4  * Copyright (C) 2008, 2009, 2010 Paxton Smith, Matthew Safar, Rory Filer
   5  *                          <linux@sierrawireless.com>
   6  *
   7  * Portions of this based on the cdc_ether driver by David Brownell (2003-2005)
   8  * and Ole Andre Vadla Ravnas (ActiveSync) (2006).
   9  *
  10  * IMPORTANT DISCLAIMER: This driver is not commercially supported by
  11  * Sierra Wireless. Use at your own risk.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27 #define DRIVER_VERSION "v.2.0"
  28 #define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
  29 #define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
  30 static const char driver_name[] = "sierra_net";
  31
  32 /* if defined debug messages enabled */
  33 /*#define       DEBUG*/
  34
  35 #include <linux/module.h>
  36 #include <linux/etherdevice.h>
  37 #include <linux/ethtool.h>
  38 #include <linux/mii.h>
  39 #include <linux/sched.h>
  40 #include <linux/timer.h>
  41 #include <linux/usb.h>
  42 #include <linux/usb/cdc.h>
  43 #include <net/ip.h>
  44 #include <net/udp.h>
  45 #include <asm/unaligned.h>
  46 #include <linux/usb/usbnet.h>
  47
  48 #define SWI_USB_REQUEST_GET_FW_ATTR     0x06
  49 #define SWI_GET_FW_ATTR_MASK            0x08
  50
  51 /* atomic counter partially included in MAC address to make sure 2 devices
  52  * do not end up with the same MAC - concept breaks in case of > 255 ifaces
  53  */
  54 static  atomic_t iface_counter = ATOMIC_INIT(0);
  55
  56 /*
  57  * SYNC Timer Delay definition used to set the expiry time
  58  */
  59 #define SIERRA_NET_SYNCDELAY (2*HZ)
  60
  61 /* Max. MTU supported. The modem buffers are limited to 1500 */
  62 #define SIERRA_NET_MAX_SUPPORTED_MTU    1500
  63
  64 /* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
  65  * message reception ... and thus the max. received packet.
  66  * (May be the cause for parse_hip returning -EINVAL)
  67  */
  68 #define SIERRA_NET_USBCTL_BUF_LEN       1024
  69
  70 /* Overriding the default usbnet rx_urb_size */
  71 #define SIERRA_NET_RX_URB_SIZE          (8 * 1024)
  72
  73 /* Private data structure */
  74 struct sierra_net_data {
  75
  76         u8 ethr_hdr_tmpl[ETH_HLEN]; /* ethernet header template for rx'd pkts */
  77
  78         u16 link_up;            /* air link up or down */
  79         u8 tx_hdr_template[4];  /* part of HIP hdr for tx'd packets */
  80
  81         u8 sync_msg[4];         /* SYNC message */
  82         u8 shdwn_msg[4];        /* Shutdown message */
  83
  84         /* Backpointer to the container */
  85         struct usbnet *usbnet;
  86
  87         u8 ifnum;       /* interface number */
  88
  89 /* Bit masks, must be a power of 2 */
  90 #define SIERRA_NET_EVENT_RESP_AVAIL    0x01
  91 #define SIERRA_NET_TIMER_EXPIRY        0x02
  92         unsigned long kevent_flags;
  93         struct work_struct sierra_net_kevent;
  94         struct timer_list sync_timer; /* For retrying SYNC sequence */
  95 };
  96
  97 struct param {
  98         int is_present;
  99         union {
 100                 void  *ptr;
 101                 u32    dword;
 102                 u16    word;
 103                 u8     byte;
 104         };
 105 };
 106
 107 /* HIP message type */
 108 #define SIERRA_NET_HIP_EXTENDEDID       0x7F
 109 #define SIERRA_NET_HIP_HSYNC_ID         0x60    /* Modem -> host */
 110 #define SIERRA_NET_HIP_RESTART_ID       0x62    /* Modem -> host */
 111 #define SIERRA_NET_HIP_MSYNC_ID         0x20    /* Host -> modem */
 112 #define SIERRA_NET_HIP_SHUTD_ID         0x26    /* Host -> modem */
 113
 114 #define SIERRA_NET_HIP_EXT_IP_IN_ID   0x0202
 115 #define SIERRA_NET_HIP_EXT_IP_OUT_ID  0x0002
 116
 117 /* 3G UMTS Link Sense Indication definitions */
 118 #define SIERRA_NET_HIP_LSI_UMTSID       0x78
 119
 120 /* Reverse Channel Grant Indication HIP message */
 121 #define SIERRA_NET_HIP_RCGI             0x64
 122
 123 /* LSI Protocol types */
 124 #define SIERRA_NET_PROTOCOL_UMTS      0x01
 125 /* LSI Coverage */
 126 #define SIERRA_NET_COVERAGE_NONE      0x00
 127 #define SIERRA_NET_COVERAGE_NOPACKET  0x01
 128
 129 /* LSI Session */
 130 #define SIERRA_NET_SESSION_IDLE       0x00
 131 /* LSI Link types */
 132 #define SIERRA_NET_AS_LINK_TYPE_IPv4  0x00
 133
 134 struct lsi_umts {
 135         u8 protocol;
 136         u8 unused1;
 137         __be16 length;
 138         /* eventually use a union for the rest - assume umts for now */
 139         u8 coverage;
 140         u8 unused2[41];
 141         u8 session_state;
 142         u8 unused3[33];
 143         u8 link_type;
 144         u8 pdp_addr_len; /* NW-supplied PDP address len */
 145         u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
 146         u8 unused4[23];
 147         u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
 148         u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
 149         u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
 150         u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
 151         u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
 152         u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
 153         u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
 154         u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
 155         u8 unused5[4];
 156         u8 gw_addr_len; /* NW-supplied GW address len */
 157         u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
 158         u8 reserved[8];
 159 } __packed;
 160
 161 #define SIERRA_NET_LSI_COMMON_LEN      4
 162 #define SIERRA_NET_LSI_UMTS_LEN        (sizeof(struct lsi_umts))
 163 #define SIERRA_NET_LSI_UMTS_STATUS_LEN \
 164         (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
 165
 166 /* Forward definitions */
 167 static void sierra_sync_timer(unsigned long syncdata);
 168 static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
 169
 170 /* Our own net device operations structure */
 171 static const struct net_device_ops sierra_net_device_ops = {
 172         .ndo_open               = usbnet_open,
 173         .ndo_stop               = usbnet_stop,
 174         .ndo_start_xmit         = usbnet_start_xmit,
 175         .ndo_tx_timeout         = usbnet_tx_timeout,
 176         .ndo_change_mtu         = sierra_net_change_mtu,
 177         .ndo_set_mac_address    = eth_mac_addr,
 178         .ndo_validate_addr      = eth_validate_addr,
 179 };
 180
 181 /* get private data associated with passed in usbnet device */
 182 static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
 183 {
 184         return (struct sierra_net_data *)dev->data[0];
 185 }
 186
 187 /* set private data associated with passed in usbnet device */
 188 static inline void sierra_net_set_private(struct usbnet *dev,
 189                         struct sierra_net_data *priv)
 190 {
 191         dev->data[0] = (unsigned long)priv;
 192 }
 193
 194 /* is packet IPv4 */
 195 static inline int is_ip(struct sk_buff *skb)
 196 {
 197         return skb->protocol == cpu_to_be16(ETH_P_IP);
 198 }
 199
 200 /*
 201  * check passed in packet and make sure that:
 202  *  - it is linear (no scatter/gather)
 203  *  - it is ethernet (mac_header properly set)
 204  */
 205 static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
 206 {
 207         skb_reset_mac_header(skb); /* ethernet header */
 208
 209         if (skb_is_nonlinear(skb)) {
 210                 netdev_err(dev->net, "Non linear buffer-dropping\n");
 211                 return 0;
 212         }
 213
 214         if (!pskb_may_pull(skb, ETH_HLEN))
 215                 return 0;
 216         skb->protocol = eth_hdr(skb)->h_proto;
 217
 218         return 1;
 219 }
 220
 221 static const u8 *save16bit(struct param *p, const u8 *datap)
 222 {
 223         p->is_present = 1;
 224         p->word = get_unaligned_be16(datap);
 225         return datap + sizeof(p->word);
 226 }
 227
 228 static const u8 *save8bit(struct param *p, const u8 *datap)
 229 {
 230         p->is_present = 1;
 231         p->byte = *datap;
 232         return datap + sizeof(p->byte);
 233 }
 234
 235 /*----------------------------------------------------------------------------*
 236  *                              BEGIN HIP                                     *
 237  *----------------------------------------------------------------------------*/
 238 /* HIP header */
 239 #define SIERRA_NET_HIP_HDR_LEN 4
 240 /* Extended HIP header */
 241 #define SIERRA_NET_HIP_EXT_HDR_LEN 6
 242
 243 struct hip_hdr {
 244         int    hdrlen;
 245         struct param payload_len;
 246         struct param msgid;
 247         struct param msgspecific;
 248         struct param extmsgid;
 249 };
 250
 251 static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
 252 {
 253         const u8 *curp = buf;
 254         int    padded;
 255
 256         if (buflen < SIERRA_NET_HIP_HDR_LEN)
 257                 return -EPROTO;
 258
 259         curp = save16bit(&hh->payload_len, curp);
 260         curp = save8bit(&hh->msgid, curp);
 261         curp = save8bit(&hh->msgspecific, curp);
 262
 263         padded = hh->msgid.byte & 0x80;
 264         hh->msgid.byte &= 0x7F;                 /* 7 bits */
 265
 266         hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
 267         if (hh->extmsgid.is_present) {
 268                 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
 269                         return -EPROTO;
 270
 271                 hh->payload_len.word &= 0x3FFF; /* 14 bits */
 272
 273                 curp = save16bit(&hh->extmsgid, curp);
 274                 hh->extmsgid.word &= 0x03FF;    /* 10 bits */
 275
 276                 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
 277         } else {
 278                 hh->payload_len.word &= 0x07FF; /* 11 bits */
 279                 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
 280         }
 281
 282         if (padded) {
 283                 hh->hdrlen++;
 284                 hh->payload_len.word--;
 285         }
 286
 287         /* if real packet shorter than the claimed length */
 288         if (buflen < (hh->hdrlen + hh->payload_len.word))
 289                 return -EINVAL;
 290
 291         return 0;
 292 }
 293
 294 static void build_hip(u8 *buf, const u16 payloadlen,
 295                 struct sierra_net_data *priv)
 296 {
 297         /* the following doesn't have the full functionality. We
 298          * currently build only one kind of header, so it is faster this way
 299          */
 300         put_unaligned_be16(payloadlen, buf);
 301         memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
 302 }
 303 /*----------------------------------------------------------------------------*
 304  *                              END HIP                                       *
 305  *----------------------------------------------------------------------------*/
 306
 307 static int sierra_net_send_cmd(struct usbnet *dev,
 308                 u8 *cmd, int cmdlen, const char * cmd_name)
 309 {
 310         struct sierra_net_data *priv = sierra_net_get_private(dev);
 311         int  status;
 312
 313         status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
 314                                   USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
 315                                   0, priv->ifnum, cmd, cmdlen);
 316
 317         if (status != cmdlen && status != -ENODEV)
 318                 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
 319
 320         return status;
 321 }
 322
 323 static int sierra_net_send_sync(struct usbnet *dev)
 324 {
 325         int  status;
 326         struct sierra_net_data *priv = sierra_net_get_private(dev);
 327
 328         dev_dbg(&dev->udev->dev, "%s", __func__);
 329
 330         status = sierra_net_send_cmd(dev, priv->sync_msg,
 331                         sizeof(priv->sync_msg), "SYNC");
 332
 333         return status;
 334 }
 335
 336 static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
 337 {
 338         dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
 339         priv->tx_hdr_template[0] = 0x3F;
 340         priv->tx_hdr_template[1] = ctx_ix;
 341         *((__be16 *)&priv->tx_hdr_template[2]) =
 342                 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
 343 }
 344
 345 static inline int sierra_net_is_valid_addrlen(u8 len)
 346 {
 347         return len == sizeof(struct in_addr);
 348 }
 349
 350 static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
 351 {
 352         struct lsi_umts *lsi = (struct lsi_umts *)data;
 353
 354         if (datalen < sizeof(struct lsi_umts)) {
 355                 netdev_err(dev->net, "%s: Data length %d, exp %Zu\n",
 356                                 __func__, datalen,
 357                                 sizeof(struct lsi_umts));
 358                 return -1;
 359         }
 360
 361         if (lsi->length != cpu_to_be16(SIERRA_NET_LSI_UMTS_STATUS_LEN)) {
 362                 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
 363                                 __func__, be16_to_cpu(lsi->length),
 364                                 (u32)SIERRA_NET_LSI_UMTS_STATUS_LEN);
 365                 return -1;
 366         }
 367
 368         /* Validate the protocol  - only support UMTS for now */
 369         if (lsi->protocol != SIERRA_NET_PROTOCOL_UMTS) {
 370                 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
 371                         lsi->protocol);
 372                 return -1;
 373         }
 374
 375         /* Validate the link type */
 376         if (lsi->link_type != SIERRA_NET_AS_LINK_TYPE_IPv4) {
 377                 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
 378                         lsi->link_type);
 379                 return -1;
 380         }
 381
 382         /* Validate the coverage */
 383         if (lsi->coverage == SIERRA_NET_COVERAGE_NONE
 384            || lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
 385                 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
 386                 return 0;
 387         }
 388
 389         /* Validate the session state */
 390         if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
 391                 netdev_err(dev->net, "Session idle, 0x%02x\n",
 392                         lsi->session_state);
 393                 return 0;
 394         }
 395
 396         /* Set link_sense true */
 397         return 1;
 398 }
 399
 400 static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
 401                 struct hip_hdr  *hh)
 402 {
 403         struct sierra_net_data *priv = sierra_net_get_private(dev);
 404         int link_up;
 405
 406         link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
 407                                         hh->payload_len.word);
 408         if (link_up < 0) {
 409                 netdev_err(dev->net, "Invalid LSI\n");
 410                 return;
 411         }
 412         if (link_up) {
 413                 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
 414                 priv->link_up = 1;
 415         } else {
 416                 priv->link_up = 0;
 417         }
 418         usbnet_link_change(dev, link_up, 0);
 419 }
 420
 421 static void sierra_net_dosync(struct usbnet *dev)
 422 {
 423         int status;
 424         struct sierra_net_data *priv = sierra_net_get_private(dev);
 425
 426         dev_dbg(&dev->udev->dev, "%s", __func__);
 427
 428         /* The SIERRA_NET_HIP_MSYNC_ID command appears to request that the
 429          * firmware restart itself.  After restarting, the modem will respond
 430          * with the SIERRA_NET_HIP_RESTART_ID indication.  The driver continues
 431          * sending MSYNC commands every few seconds until it receives the
 432          * RESTART event from the firmware
 433          */
 434
 435         /* tell modem we are ready */
 436         status = sierra_net_send_sync(dev);
 437         if (status < 0)
 438                 netdev_err(dev->net,
 439                         "Send SYNC failed, status %d\n", status);
 440         status = sierra_net_send_sync(dev);
 441         if (status < 0)
 442                 netdev_err(dev->net,
 443                         "Send SYNC failed, status %d\n", status);
 444
 445         /* Now, start a timer and make sure we get the Restart Indication */
 446         priv->sync_timer.function = sierra_sync_timer;
 447         priv->sync_timer.data = (unsigned long) dev;
 448         priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
 449         add_timer(&priv->sync_timer);
 450 }
 451
 452 static void sierra_net_kevent(struct work_struct *work)
 453 {
 454         struct sierra_net_data *priv =
 455                 container_of(work, struct sierra_net_data, sierra_net_kevent);
 456         struct usbnet *dev = priv->usbnet;
 457         int  len;
 458         int  err;
 459         u8  *buf;
 460         u8   ifnum;
 461
 462         if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
 463                 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
 464
 465                 /* Query the modem for the LSI message */
 466                 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
 467                 if (!buf)
 468                         return;
 469
 470                 ifnum = priv->ifnum;
 471                 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
 472                                 USB_CDC_GET_ENCAPSULATED_RESPONSE,
 473                                 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
 474                                 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
 475                                 USB_CTRL_SET_TIMEOUT);
 476
 477                 if (len < 0) {
 478                         netdev_err(dev->net,
 479                                 "usb_control_msg failed, status %d\n", len);
 480                 } else {
 481                         struct hip_hdr  hh;
 482
 483                         dev_dbg(&dev->udev->dev, "%s: Received status message,"
 484                                 " %04x bytes", __func__, len);
 485
 486                         err = parse_hip(buf, len, &hh);
 487                         if (err) {
 488                                 netdev_err(dev->net, "%s: Bad packet,"
 489                                         " parse result %d\n", __func__, err);
 490                                 kfree(buf);
 491                                 return;
 492                         }
 493
 494                         /* Validate packet length */
 495                         if (len != hh.hdrlen + hh.payload_len.word) {
 496                                 netdev_err(dev->net, "%s: Bad packet, received"
 497                                         " %d, expected %d\n",   __func__, len,
 498                                         hh.hdrlen + hh.payload_len.word);
 499                                 kfree(buf);
 500                                 return;
 501                         }
 502
 503                         /* Switch on received message types */
 504                         switch (hh.msgid.byte) {
 505                         case SIERRA_NET_HIP_LSI_UMTSID:
 506                                 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
 507                                         hh.msgspecific.byte);
 508                                 sierra_net_handle_lsi(dev, buf, &hh);
 509                                 break;
 510                         case SIERRA_NET_HIP_RESTART_ID:
 511                                 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
 512                                                 " stopping sync timer",
 513                                                 hh.msgspecific.byte);
 514                                 /* Got sync resp - stop timer & clear mask */
 515                                 del_timer_sync(&priv->sync_timer);
 516                                 clear_bit(SIERRA_NET_TIMER_EXPIRY,
 517                                           &priv->kevent_flags);
 518                                 break;
 519                         case SIERRA_NET_HIP_HSYNC_ID:
 520                                 dev_dbg(&dev->udev->dev, "SYNC received");
 521                                 err = sierra_net_send_sync(dev);
 522                                 if (err < 0)
 523                                         netdev_err(dev->net,
 524                                                 "Send SYNC failed %d\n", err);
 525                                 break;
 526                         case SIERRA_NET_HIP_EXTENDEDID:
 527                                 netdev_err(dev->net, "Unrecognized HIP msg, "
 528                                         "extmsgid 0x%04x\n", hh.extmsgid.word);
 529                                 break;
 530                         case SIERRA_NET_HIP_RCGI:
 531                                 /* Ignored */
 532                                 break;
 533                         default:
 534                                 netdev_err(dev->net, "Unrecognized HIP msg, "
 535                                         "msgid 0x%02x\n", hh.msgid.byte);
 536                                 break;
 537                         }
 538                 }
 539                 kfree(buf);
 540         }
 541         /* The sync timer bit might be set */
 542         if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
 543                 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
 544                 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
 545                 sierra_net_dosync(priv->usbnet);
 546         }
 547
 548         if (priv->kevent_flags)
 549                 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
 550                         "kevent_flags = 0x%lx", priv->kevent_flags);
 551 }
 552
 553 static void sierra_net_defer_kevent(struct usbnet *dev, int work)
 554 {
 555         struct sierra_net_data *priv = sierra_net_get_private(dev);
 556
 557         set_bit(work, &priv->kevent_flags);
 558         schedule_work(&priv->sierra_net_kevent);
 559 }
 560
 561 /*
 562  * Sync Retransmit Timer Handler. On expiry, kick the work queue
 563  */
 564 static void sierra_sync_timer(unsigned long syncdata)
 565 {
 566         struct usbnet *dev = (struct usbnet *)syncdata;
 567
 568         dev_dbg(&dev->udev->dev, "%s", __func__);
 569         /* Kick the tasklet */
 570         sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
 571 }
 572
 573 static void sierra_net_status(struct usbnet *dev, struct urb *urb)
 574 {
 575         struct usb_cdc_notification *event;
 576
 577         dev_dbg(&dev->udev->dev, "%s", __func__);
 578
 579         if (urb->actual_length < sizeof *event)
 580                 return;
 581
 582         /* Add cases to handle other standard notifications. */
 583         event = urb->transfer_buffer;
 584         switch (event->bNotificationType) {
 585         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 586         case USB_CDC_NOTIFY_SPEED_CHANGE:
 587                 /* USB 305 sends those */
 588                 break;
 589         case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
 590                 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
 591                 break;
 592         default:
 593                 netdev_err(dev->net, ": unexpected notification %02x!\n",
 594                                 event->bNotificationType);
 595                 break;
 596         }
 597 }
 598
 599 static void sierra_net_get_drvinfo(struct net_device *net,
 600                 struct ethtool_drvinfo *info)
 601 {
 602         /* Inherit standard device info */
 603         usbnet_get_drvinfo(net, info);
 604         strlcpy(info->driver, driver_name, sizeof(info->driver));
 605         strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 606 }
 607
 608 static u32 sierra_net_get_link(struct net_device *net)
 609 {
 610         struct usbnet *dev = netdev_priv(net);
 611         /* Report link is down whenever the interface is down */
 612         return sierra_net_get_private(dev)->link_up && netif_running(net);
 613 }
 614
 615 static const struct ethtool_ops sierra_net_ethtool_ops = {
 616         .get_drvinfo = sierra_net_get_drvinfo,
 617         .get_link = sierra_net_get_link,
 618         .get_msglevel = usbnet_get_msglevel,
 619         .set_msglevel = usbnet_set_msglevel,
 620         .get_settings = usbnet_get_settings,
 621         .set_settings = usbnet_set_settings,
 622         .nway_reset = usbnet_nway_reset,
 623 };
 624
 625 /* MTU can not be more than 1500 bytes, enforce it. */
 626 static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
 627 {
 628         if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
 629                 return -EINVAL;
 630
 631         return usbnet_change_mtu(net, new_mtu);
 632 }
 633
 634 static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
 635 {
 636         int result = 0;
 637         __le16 attrdata;
 638
 639         result = usbnet_read_cmd(dev,
 640                                 /* _u8 vendor specific request */
 641                                 SWI_USB_REQUEST_GET_FW_ATTR,
 642                                 USB_DIR_IN | USB_TYPE_VENDOR,   /* __u8 request type */
 643                                 0x0000,         /* __u16 value not used */
 644                                 0x0000,         /* __u16 index  not used */
 645                                 &attrdata,      /* char *data */
 646                                 sizeof(attrdata)        /* __u16 size */
 647                                 );
 648
 649         if (result < 0)
 650                 return -EIO;
 651
 652         *datap = le16_to_cpu(attrdata);
 653         return result;
 654 }
 655
 656 /*
 657  * collects the bulk endpoints, the status endpoint.
 658  */
 659 static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
 660 {
 661         u8      ifacenum;
 662         u8      numendpoints;
 663         u16     fwattr = 0;
 664         int     status;
 665         struct ethhdr *eth;
 666         struct sierra_net_data *priv;
 667         static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
 668                 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
 669         static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
 670                 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
 671
 672         dev_dbg(&dev->udev->dev, "%s", __func__);
 673
 674         ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
 675         numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
 676         /* We have three endpoints, bulk in and out, and a status */
 677         if (numendpoints != 3) {
 678                 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
 679                         numendpoints);
 680                 return -ENODEV;
 681         }
 682         /* Status endpoint set in usbnet_get_endpoints() */
 683         dev->status = NULL;
 684         status = usbnet_get_endpoints(dev, intf);
 685         if (status < 0) {
 686                 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
 687                         status);
 688                 return -ENODEV;
 689         }
 690         /* Initialize sierra private data */
 691         priv = kzalloc(sizeof *priv, GFP_KERNEL);
 692         if (!priv)
 693                 return -ENOMEM;
 694
 695         priv->usbnet = dev;
 696         priv->ifnum = ifacenum;
 697         dev->net->netdev_ops = &sierra_net_device_ops;
 698
 699         /* change MAC addr to include, ifacenum, and to be unique */
 700         dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
 701         dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
 702
 703         /* we will have to manufacture ethernet headers, prepare template */
 704         eth = (struct ethhdr *)priv->ethr_hdr_tmpl;
 705         memcpy(&eth->h_dest, dev->net->dev_addr, ETH_ALEN);
 706         eth->h_proto = cpu_to_be16(ETH_P_IP);
 707
 708         /* prepare shutdown message template */
 709         memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
 710         /* set context index initially to 0 - prepares tx hdr template */
 711         sierra_net_set_ctx_index(priv, 0);
 712
 713         /* prepare sync message template */
 714         memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
 715
 716         /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
 717         dev->rx_urb_size  = SIERRA_NET_RX_URB_SIZE;
 718         if (dev->udev->speed != USB_SPEED_HIGH)
 719                 dev->rx_urb_size  = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
 720
 721         dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
 722         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 723
 724         /* Set up the netdev */
 725         dev->net->flags |= IFF_NOARP;
 726         dev->net->ethtool_ops = &sierra_net_ethtool_ops;
 727         netif_carrier_off(dev->net);
 728
 729         sierra_net_set_private(dev, priv);
 730
 731         priv->kevent_flags = 0;
 732
 733         /* Use the shared workqueue */
 734         INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
 735
 736         /* Only need to do this once */
 737         init_timer(&priv->sync_timer);
 738
 739         /* verify fw attributes */
 740         status = sierra_net_get_fw_attr(dev, &fwattr);
 741         dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
 742
 743         /* test whether firmware supports DHCP */
 744         if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
 745                 /* found incompatible firmware version */
 746                 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
 747                         " versions\n");
 748                 kfree(priv);
 749                 return -ENODEV;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
 756 {
 757         int status;
 758         struct sierra_net_data *priv = sierra_net_get_private(dev);
 759
 760         dev_dbg(&dev->udev->dev, "%s", __func__);
 761
 762         /* kill the timer and work */
 763         del_timer_sync(&priv->sync_timer);
 764         cancel_work_sync(&priv->sierra_net_kevent);
 765
 766         /* tell modem we are going away */
 767         status = sierra_net_send_cmd(dev, priv->shdwn_msg,
 768                         sizeof(priv->shdwn_msg), "Shutdown");
 769         if (status < 0)
 770                 netdev_err(dev->net,
 771                         "usb_control_msg failed, status %d\n", status);
 772
 773         usbnet_status_stop(dev);
 774
 775         sierra_net_set_private(dev, NULL);
 776         kfree(priv);
 777 }
 778
 779 static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
 780                 struct sk_buff *skb, int len)
 781 {
 782         struct sk_buff *new_skb;
 783
 784         /* clone skb */
 785         new_skb = skb_clone(skb, GFP_ATOMIC);
 786
 787         /* remove len bytes from original */
 788         skb_pull(skb, len);
 789
 790         /* trim next packet to it's length */
 791         if (new_skb) {
 792                 skb_trim(new_skb, len);
 793         } else {
 794                 if (netif_msg_rx_err(dev))
 795                         netdev_err(dev->net, "failed to get skb\n");
 796                 dev->net->stats.rx_dropped++;
 797         }
 798
 799         return new_skb;
 800 }
 801
 802 /* ---------------------------- Receive data path ----------------------*/
 803 static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 804 {
 805         int err;
 806         struct hip_hdr  hh;
 807         struct sk_buff *new_skb;
 808
 809         dev_dbg(&dev->udev->dev, "%s", __func__);
 810
 811         /* could contain multiple packets */
 812         while (likely(skb->len)) {
 813                 err = parse_hip(skb->data, skb->len, &hh);
 814                 if (err) {
 815                         if (netif_msg_rx_err(dev))
 816                                 netdev_err(dev->net, "Invalid HIP header %d\n",
 817                                         err);
 818                         /* dev->net->stats.rx_errors incremented by caller */
 819                         dev->net->stats.rx_length_errors++;
 820                         return 0;
 821                 }
 822
 823                 /* Validate Extended HIP header */
 824                 if (!hh.extmsgid.is_present
 825                     || hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
 826                         if (netif_msg_rx_err(dev))
 827                                 netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
 828
 829                         dev->net->stats.rx_frame_errors++;
 830                         /* dev->net->stats.rx_errors incremented by caller */
 831                         return 0;
 832                 }
 833
 834                 skb_pull(skb, hh.hdrlen);
 835
 836                 /* We are going to accept this packet, prepare it */
 837                 memcpy(skb->data, sierra_net_get_private(dev)->ethr_hdr_tmpl,
 838                         ETH_HLEN);
 839
 840                 /* Last packet in batch handled by usbnet */
 841                 if (hh.payload_len.word == skb->len)
 842                         return 1;
 843
 844                 new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
 845                 if (new_skb)
 846                         usbnet_skb_return(dev, new_skb);
 847
 848         } /* while */
 849
 850         return 0;
 851 }
 852
 853 /* ---------------------------- Transmit data path ----------------------*/
 854 static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev,
 855                                            struct sk_buff *skb, gfp_t flags)
 856 {
 857         struct sierra_net_data *priv = sierra_net_get_private(dev);
 858         u16 len;
 859         bool need_tail;
 860
 861         BUILD_BUG_ON(FIELD_SIZEOF(struct usbnet, data)
 862                                 < sizeof(struct cdc_state));
 863
 864         dev_dbg(&dev->udev->dev, "%s", __func__);
 865         if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
 866                 /* enough head room as is? */
 867                 if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
 868                         /* Save the Eth/IP length and set up HIP hdr */
 869                         len = skb->len;
 870                         skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
 871                         /* Handle ZLP issue */
 872                         need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
 873                                 % dev->maxpacket == 0);
 874                         if (need_tail) {
 875                                 if (unlikely(skb_tailroom(skb) == 0)) {
 876                                         netdev_err(dev->net, "tx_fixup:"
 877                                                 "no room for packet\n");
 878                                         dev_kfree_skb_any(skb);
 879                                         return NULL;
 880                                 } else {
 881                                         skb->data[skb->len] = 0;
 882                                         __skb_put(skb, 1);
 883                                         len = len + 1;
 884                                 }
 885                         }
 886                         build_hip(skb->data, len, priv);
 887                         return skb;
 888                 } else {
 889                         /*
 890                          * compensate in the future if necessary
 891                          */
 892                         netdev_err(dev->net, "tx_fixup: no room for HIP\n");
 893                 } /* headroom */
 894         }
 895
 896         if (!priv->link_up)
 897                 dev->net->stats.tx_carrier_errors++;
 898
 899         /* tx_dropped incremented by usbnet */
 900
 901         /* filter the packet out, release it  */
 902         dev_kfree_skb_any(skb);
 903         return NULL;
 904 }
 905
 906 static const struct driver_info sierra_net_info_direct_ip = {
 907         .description = "Sierra Wireless USB-to-WWAN Modem",
 908         .flags = FLAG_WWAN | FLAG_SEND_ZLP,
 909         .bind = sierra_net_bind,
 910         .unbind = sierra_net_unbind,
 911         .status = sierra_net_status,
 912         .rx_fixup = sierra_net_rx_fixup,
 913         .tx_fixup = sierra_net_tx_fixup,
 914 };
 915
 916 static int
 917 sierra_net_probe(struct usb_interface *udev, const struct usb_device_id *prod)
 918 {
 919         int ret;
 920
 921         ret = usbnet_probe(udev, prod);
 922         if (ret == 0) {
 923                 struct usbnet *dev = usb_get_intfdata(udev);
 924
 925                 ret = usbnet_status_start(dev, GFP_KERNEL);
 926                 if (ret == 0) {
 927                         /* Interrupt URB now set up; initiate sync sequence */
 928                         sierra_net_dosync(dev);
 929                 }
 930         }
 931         return ret;
 932 }
 933
 934 #define DIRECT_IP_DEVICE(vend, prod) \
 935         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
 936         .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
 937         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
 938         .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
 939         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
 940         .driver_info = (unsigned long)&sierra_net_info_direct_ip}
 941
 942 static const struct usb_device_id products[] = {
 943         DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
 944         DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
 945         DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
 946         DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
 947
 948         {}, /* last item */
 949 };
 950 MODULE_DEVICE_TABLE(usb, products);
 951
 952 /* We are based on usbnet, so let it handle the USB driver specifics */
 953 static struct usb_driver sierra_net_driver = {
 954         .name = "sierra_net",
 955         .id_table = products,
 956         .probe = sierra_net_probe,
 957         .disconnect = usbnet_disconnect,
 958         .suspend = usbnet_suspend,
 959         .resume = usbnet_resume,
 960         .no_dynamic_id = 1,
 961         .disable_hub_initiated_lpm = 1,
 962 };
 963
 964 module_usb_driver(sierra_net_driver);
 965
 966 MODULE_AUTHOR(DRIVER_AUTHOR);
 967 MODULE_DESCRIPTION(DRIVER_DESC);
 968 MODULE_VERSION(DRIVER_VERSION);
 969 MODULE_LICENSE("GPL");