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, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26  */
  27
  28 #define DRIVER_VERSION "v.2.0"
  29 #define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
  30 #define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
  31 static const char driver_name[] = "sierra_net";
  32
  33 /* if defined debug messages enabled */
  34 /*#define       DEBUG*/
  35
  36 #include <linux/module.h>
  37 #include <linux/etherdevice.h>
  38 #include <linux/ethtool.h>
  39 #include <linux/mii.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/usb.h>
  43 #include <linux/usb/cdc.h>
  44 #include <net/ip.h>
  45 #include <net/udp.h>
  46 #include <asm/unaligned.h>
  47 #include <linux/usb/usbnet.h>
  48
  49 #define SWI_USB_REQUEST_GET_FW_ATTR     0x06
  50 #define SWI_GET_FW_ATTR_MASK            0x08
  51
  52 /* atomic counter partially included in MAC address to make sure 2 devices
  53  * do not end up with the same MAC - concept breaks in case of > 255 ifaces
  54  */
  55 static  atomic_t iface_counter = ATOMIC_INIT(0);
  56
  57 /*
  58  * SYNC Timer Delay definition used to set the expiry time
  59  */
  60 #define SIERRA_NET_SYNCDELAY (2*HZ)
  61
  62 /* Max. MTU supported. The modem buffers are limited to 1500 */
  63 #define SIERRA_NET_MAX_SUPPORTED_MTU    1500
  64
  65 /* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
  66  * message reception ... and thus the max. received packet.
  67  * (May be the cause for parse_hip returning -EINVAL)
  68  */
  69 #define SIERRA_NET_USBCTL_BUF_LEN       1024
  70
  71 /* Overriding the default usbnet rx_urb_size */
  72 #define SIERRA_NET_RX_URB_SIZE          (8 * 1024)
  73
  74 /* Private data structure */
  75 struct sierra_net_data {
  76
  77         u8 ethr_hdr_tmpl[ETH_HLEN]; /* ethernet header template for rx'd pkts */
  78
  79         u16 link_up;            /* air link up or down */
  80         u8 tx_hdr_template[4];  /* part of HIP hdr for tx'd packets */
  81
  82         u8 sync_msg[4];         /* SYNC message */
  83         u8 shdwn_msg[4];        /* Shutdown message */
  84
  85         /* Backpointer to the container */
  86         struct usbnet *usbnet;
  87
  88         u8 ifnum;       /* interface number */
  89
  90 /* Bit masks, must be a power of 2 */
  91 #define SIERRA_NET_EVENT_RESP_AVAIL    0x01
  92 #define SIERRA_NET_TIMER_EXPIRY        0x02
  93         unsigned long kevent_flags;
  94         struct work_struct sierra_net_kevent;
  95         struct timer_list sync_timer; /* For retrying SYNC sequence */
  96 };
  97
  98 struct param {
  99         int is_present;
 100         union {
 101                 void  *ptr;
 102                 u32    dword;
 103                 u16    word;
 104                 u8     byte;
 105         };
 106 };
 107
 108 /* HIP message type */
 109 #define SIERRA_NET_HIP_EXTENDEDID       0x7F
 110 #define SIERRA_NET_HIP_HSYNC_ID         0x60    /* Modem -> host */
 111 #define SIERRA_NET_HIP_RESTART_ID       0x62    /* Modem -> host */
 112 #define SIERRA_NET_HIP_MSYNC_ID         0x20    /* Host -> modem */
 113 #define SIERRA_NET_HIP_SHUTD_ID         0x26    /* Host -> modem */
 114
 115 #define SIERRA_NET_HIP_EXT_IP_IN_ID   0x0202
 116 #define SIERRA_NET_HIP_EXT_IP_OUT_ID  0x0002
 117
 118 /* 3G UMTS Link Sense Indication definitions */
 119 #define SIERRA_NET_HIP_LSI_UMTSID       0x78
 120
 121 /* Reverse Channel Grant Indication HIP message */
 122 #define SIERRA_NET_HIP_RCGI             0x64
 123
 124 /* LSI Protocol types */
 125 #define SIERRA_NET_PROTOCOL_UMTS      0x01
 126 /* LSI Coverage */
 127 #define SIERRA_NET_COVERAGE_NONE      0x00
 128 #define SIERRA_NET_COVERAGE_NOPACKET  0x01
 129
 130 /* LSI Session */
 131 #define SIERRA_NET_SESSION_IDLE       0x00
 132 /* LSI Link types */
 133 #define SIERRA_NET_AS_LINK_TYPE_IPv4  0x00
 134
 135 struct lsi_umts {
 136         u8 protocol;
 137         u8 unused1;
 138         __be16 length;
 139         /* eventually use a union for the rest - assume umts for now */
 140         u8 coverage;
 141         u8 unused2[41];
 142         u8 session_state;
 143         u8 unused3[33];
 144         u8 link_type;
 145         u8 pdp_addr_len; /* NW-supplied PDP address len */
 146         u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
 147         u8 unused4[23];
 148         u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
 149         u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
 150         u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
 151         u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
 152         u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
 153         u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
 154         u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
 155         u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
 156         u8 unused5[4];
 157         u8 gw_addr_len; /* NW-supplied GW address len */
 158         u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
 159         u8 reserved[8];
 160 } __packed;
 161
 162 #define SIERRA_NET_LSI_COMMON_LEN      4
 163 #define SIERRA_NET_LSI_UMTS_LEN        (sizeof(struct lsi_umts))
 164 #define SIERRA_NET_LSI_UMTS_STATUS_LEN \
 165         (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
 166
 167 /* Forward definitions */
 168 static void sierra_sync_timer(unsigned long syncdata);
 169 static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
 170
 171 /* Our own net device operations structure */
 172 static const struct net_device_ops sierra_net_device_ops = {
 173         .ndo_open               = usbnet_open,
 174         .ndo_stop               = usbnet_stop,
 175         .ndo_start_xmit         = usbnet_start_xmit,
 176         .ndo_tx_timeout         = usbnet_tx_timeout,
 177         .ndo_change_mtu         = sierra_net_change_mtu,
 178         .ndo_set_mac_address    = eth_mac_addr,
 179         .ndo_validate_addr      = eth_validate_addr,
 180 };
 181
 182 /* get private data associated with passed in usbnet device */
 183 static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
 184 {
 185         return (struct sierra_net_data *)dev->data[0];
 186 }
 187
 188 /* set private data associated with passed in usbnet device */
 189 static inline void sierra_net_set_private(struct usbnet *dev,
 190                         struct sierra_net_data *priv)
 191 {
 192         dev->data[0] = (unsigned long)priv;
 193 }
 194
 195 /* is packet IPv4 */
 196 static inline int is_ip(struct sk_buff *skb)
 197 {
 198         return skb->protocol == cpu_to_be16(ETH_P_IP);
 199 }
 200
 201 /*
 202  * check passed in packet and make sure that:
 203  *  - it is linear (no scatter/gather)
 204  *  - it is ethernet (mac_header properly set)
 205  */
 206 static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
 207 {
 208         skb_reset_mac_header(skb); /* ethernet header */
 209
 210         if (skb_is_nonlinear(skb)) {
 211                 netdev_err(dev->net, "Non linear buffer-dropping\n");
 212                 return 0;
 213         }
 214
 215         if (!pskb_may_pull(skb, ETH_HLEN))
 216                 return 0;
 217         skb->protocol = eth_hdr(skb)->h_proto;
 218
 219         return 1;
 220 }
 221
 222 static const u8 *save16bit(struct param *p, const u8 *datap)
 223 {
 224         p->is_present = 1;
 225         p->word = get_unaligned_be16(datap);
 226         return datap + sizeof(p->word);
 227 }
 228
 229 static const u8 *save8bit(struct param *p, const u8 *datap)
 230 {
 231         p->is_present = 1;
 232         p->byte = *datap;
 233         return datap + sizeof(p->byte);
 234 }
 235
 236 /*----------------------------------------------------------------------------*
 237  *                              BEGIN HIP                                     *
 238  *----------------------------------------------------------------------------*/
 239 /* HIP header */
 240 #define SIERRA_NET_HIP_HDR_LEN 4
 241 /* Extended HIP header */
 242 #define SIERRA_NET_HIP_EXT_HDR_LEN 6
 243
 244 struct hip_hdr {
 245         int    hdrlen;
 246         struct param payload_len;
 247         struct param msgid;
 248         struct param msgspecific;
 249         struct param extmsgid;
 250 };
 251
 252 static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
 253 {
 254         const u8 *curp = buf;
 255         int    padded;
 256
 257         if (buflen < SIERRA_NET_HIP_HDR_LEN)
 258                 return -EPROTO;
 259
 260         curp = save16bit(&hh->payload_len, curp);
 261         curp = save8bit(&hh->msgid, curp);
 262         curp = save8bit(&hh->msgspecific, curp);
 263
 264         padded = hh->msgid.byte & 0x80;
 265         hh->msgid.byte &= 0x7F;                 /* 7 bits */
 266
 267         hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
 268         if (hh->extmsgid.is_present) {
 269                 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
 270                         return -EPROTO;
 271
 272                 hh->payload_len.word &= 0x3FFF; /* 14 bits */
 273
 274                 curp = save16bit(&hh->extmsgid, curp);
 275                 hh->extmsgid.word &= 0x03FF;    /* 10 bits */
 276
 277                 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
 278         } else {
 279                 hh->payload_len.word &= 0x07FF; /* 11 bits */
 280                 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
 281         }
 282
 283         if (padded) {
 284                 hh->hdrlen++;
 285                 hh->payload_len.word--;
 286         }
 287
 288         /* if real packet shorter than the claimed length */
 289         if (buflen < (hh->hdrlen + hh->payload_len.word))
 290                 return -EINVAL;
 291
 292         return 0;
 293 }
 294
 295 static void build_hip(u8 *buf, const u16 payloadlen,
 296                 struct sierra_net_data *priv)
 297 {
 298         /* the following doesn't have the full functionality. We
 299          * currently build only one kind of header, so it is faster this way
 300          */
 301         put_unaligned_be16(payloadlen, buf);
 302         memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
 303 }
 304 /*----------------------------------------------------------------------------*
 305  *                              END HIP                                       *
 306  *----------------------------------------------------------------------------*/
 307
 308 static int sierra_net_send_cmd(struct usbnet *dev,
 309                 u8 *cmd, int cmdlen, const char * cmd_name)
 310 {
 311         struct sierra_net_data *priv = sierra_net_get_private(dev);
 312         int  status;
 313
 314         status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
 315                                   USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
 316                                   0, priv->ifnum, cmd, cmdlen);
 317
 318         if (status != cmdlen && status != -ENODEV)
 319                 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
 320
 321         return status;
 322 }
 323
 324 static int sierra_net_send_sync(struct usbnet *dev)
 325 {
 326         int  status;
 327         struct sierra_net_data *priv = sierra_net_get_private(dev);
 328
 329         dev_dbg(&dev->udev->dev, "%s", __func__);
 330
 331         status = sierra_net_send_cmd(dev, priv->sync_msg,
 332                         sizeof(priv->sync_msg), "SYNC");
 333
 334         return status;
 335 }
 336
 337 static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
 338 {
 339         dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
 340         priv->tx_hdr_template[0] = 0x3F;
 341         priv->tx_hdr_template[1] = ctx_ix;
 342         *((__be16 *)&priv->tx_hdr_template[2]) =
 343                 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
 344 }
 345
 346 static inline int sierra_net_is_valid_addrlen(u8 len)
 347 {
 348         return len == sizeof(struct in_addr);
 349 }
 350
 351 static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
 352 {
 353         struct lsi_umts *lsi = (struct lsi_umts *)data;
 354
 355         if (datalen < sizeof(struct lsi_umts)) {
 356                 netdev_err(dev->net, "%s: Data length %d, exp %Zu\n",
 357                                 __func__, datalen,
 358                                 sizeof(struct lsi_umts));
 359                 return -1;
 360         }
 361
 362         if (lsi->length != cpu_to_be16(SIERRA_NET_LSI_UMTS_STATUS_LEN)) {
 363                 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
 364                                 __func__, be16_to_cpu(lsi->length),
 365                                 (u32)SIERRA_NET_LSI_UMTS_STATUS_LEN);
 366                 return -1;
 367         }
 368
 369         /* Validate the protocol  - only support UMTS for now */
 370         if (lsi->protocol != SIERRA_NET_PROTOCOL_UMTS) {
 371                 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
 372                         lsi->protocol);
 373                 return -1;
 374         }
 375
 376         /* Validate the link type */
 377         if (lsi->link_type != SIERRA_NET_AS_LINK_TYPE_IPv4) {
 378                 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
 379                         lsi->link_type);
 380                 return -1;
 381         }
 382
 383         /* Validate the coverage */
 384         if (lsi->coverage == SIERRA_NET_COVERAGE_NONE
 385            || lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
 386                 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
 387                 return 0;
 388         }
 389
 390         /* Validate the session state */
 391         if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
 392                 netdev_err(dev->net, "Session idle, 0x%02x\n",
 393                         lsi->session_state);
 394                 return 0;
 395         }
 396
 397         /* Set link_sense true */
 398         return 1;
 399 }
 400
 401 static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
 402                 struct hip_hdr  *hh)
 403 {
 404         struct sierra_net_data *priv = sierra_net_get_private(dev);
 405         int link_up;
 406
 407         link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
 408                                         hh->payload_len.word);
 409         if (link_up < 0) {
 410                 netdev_err(dev->net, "Invalid LSI\n");
 411                 return;
 412         }
 413         if (link_up) {
 414                 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
 415                 priv->link_up = 1;
 416                 netif_carrier_on(dev->net);
 417         } else {
 418                 priv->link_up = 0;
 419                 netif_carrier_off(dev->net);
 420         }
 421 }
 422
 423 static void sierra_net_dosync(struct usbnet *dev)
 424 {
 425         int status;
 426         struct sierra_net_data *priv = sierra_net_get_private(dev);
 427
 428         dev_dbg(&dev->udev->dev, "%s", __func__);
 429
 430         /* tell modem we are ready */
 431         status = sierra_net_send_sync(dev);
 432         if (status < 0)
 433                 netdev_err(dev->net,
 434                         "Send SYNC failed, status %d\n", status);
 435         status = sierra_net_send_sync(dev);
 436         if (status < 0)
 437                 netdev_err(dev->net,
 438                         "Send SYNC failed, status %d\n", status);
 439
 440         /* Now, start a timer and make sure we get the Restart Indication */
 441         priv->sync_timer.function = sierra_sync_timer;
 442         priv->sync_timer.data = (unsigned long) dev;
 443         priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
 444         add_timer(&priv->sync_timer);
 445 }
 446
 447 static void sierra_net_kevent(struct work_struct *work)
 448 {
 449         struct sierra_net_data *priv =
 450                 container_of(work, struct sierra_net_data, sierra_net_kevent);
 451         struct usbnet *dev = priv->usbnet;
 452         int  len;
 453         int  err;
 454         u8  *buf;
 455         u8   ifnum;
 456
 457         if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
 458                 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
 459
 460                 /* Query the modem for the LSI message */
 461                 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
 462                 if (!buf) {
 463                         netdev_err(dev->net,
 464                                 "failed to allocate buf for LS msg\n");
 465                         return;
 466                 }
 467                 ifnum = priv->ifnum;
 468                 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
 469                                 USB_CDC_GET_ENCAPSULATED_RESPONSE,
 470                                 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
 471                                 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
 472                                 USB_CTRL_SET_TIMEOUT);
 473
 474                 if (len < 0) {
 475                         netdev_err(dev->net,
 476                                 "usb_control_msg failed, status %d\n", len);
 477                 } else {
 478                         struct hip_hdr  hh;
 479
 480                         dev_dbg(&dev->udev->dev, "%s: Received status message,"
 481                                 " %04x bytes", __func__, len);
 482
 483                         err = parse_hip(buf, len, &hh);
 484                         if (err) {
 485                                 netdev_err(dev->net, "%s: Bad packet,"
 486                                         " parse result %d\n", __func__, err);
 487                                 kfree(buf);
 488                                 return;
 489                         }
 490
 491                         /* Validate packet length */
 492                         if (len != hh.hdrlen + hh.payload_len.word) {
 493                                 netdev_err(dev->net, "%s: Bad packet, received"
 494                                         " %d, expected %d\n",   __func__, len,
 495                                         hh.hdrlen + hh.payload_len.word);
 496                                 kfree(buf);
 497                                 return;
 498                         }
 499
 500                         /* Switch on received message types */
 501                         switch (hh.msgid.byte) {
 502                         case SIERRA_NET_HIP_LSI_UMTSID:
 503                                 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
 504                                         hh.msgspecific.byte);
 505                                 sierra_net_handle_lsi(dev, buf, &hh);
 506                                 break;
 507                         case SIERRA_NET_HIP_RESTART_ID:
 508                                 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
 509                                                 " stopping sync timer",
 510                                                 hh.msgspecific.byte);
 511                                 /* Got sync resp - stop timer & clear mask */
 512                                 del_timer_sync(&priv->sync_timer);
 513                                 clear_bit(SIERRA_NET_TIMER_EXPIRY,
 514                                           &priv->kevent_flags);
 515                                 break;
 516                         case SIERRA_NET_HIP_HSYNC_ID:
 517                                 dev_dbg(&dev->udev->dev, "SYNC received");
 518                                 err = sierra_net_send_sync(dev);
 519                                 if (err < 0)
 520                                         netdev_err(dev->net,
 521                                                 "Send SYNC failed %d\n", err);
 522                                 break;
 523                         case SIERRA_NET_HIP_EXTENDEDID:
 524                                 netdev_err(dev->net, "Unrecognized HIP msg, "
 525                                         "extmsgid 0x%04x\n", hh.extmsgid.word);
 526                                 break;
 527                         case SIERRA_NET_HIP_RCGI:
 528                                 /* Ignored */
 529                                 break;
 530                         default:
 531                                 netdev_err(dev->net, "Unrecognized HIP msg, "
 532                                         "msgid 0x%02x\n", hh.msgid.byte);
 533                                 break;
 534                         }
 535                 }
 536                 kfree(buf);
 537         }
 538         /* The sync timer bit might be set */
 539         if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
 540                 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
 541                 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
 542                 sierra_net_dosync(priv->usbnet);
 543         }
 544
 545         if (priv->kevent_flags)
 546                 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
 547                         "kevent_flags = 0x%lx", priv->kevent_flags);
 548 }
 549
 550 static void sierra_net_defer_kevent(struct usbnet *dev, int work)
 551 {
 552         struct sierra_net_data *priv = sierra_net_get_private(dev);
 553
 554         set_bit(work, &priv->kevent_flags);
 555         schedule_work(&priv->sierra_net_kevent);
 556 }
 557
 558 /*
 559  * Sync Retransmit Timer Handler. On expiry, kick the work queue
 560  */
 561 static void sierra_sync_timer(unsigned long syncdata)
 562 {
 563         struct usbnet *dev = (struct usbnet *)syncdata;
 564
 565         dev_dbg(&dev->udev->dev, "%s", __func__);
 566         /* Kick the tasklet */
 567         sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
 568 }
 569
 570 static void sierra_net_status(struct usbnet *dev, struct urb *urb)
 571 {
 572         struct usb_cdc_notification *event;
 573
 574         dev_dbg(&dev->udev->dev, "%s", __func__);
 575
 576         if (urb->actual_length < sizeof *event)
 577                 return;
 578
 579         /* Add cases to handle other standard notifications. */
 580         event = urb->transfer_buffer;
 581         switch (event->bNotificationType) {
 582         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
 583         case USB_CDC_NOTIFY_SPEED_CHANGE:
 584                 /* USB 305 sends those */
 585                 break;
 586         case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
 587                 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
 588                 break;
 589         default:
 590                 netdev_err(dev->net, ": unexpected notification %02x!\n",
 591                                 event->bNotificationType);
 592                 break;
 593         }
 594 }
 595
 596 static void sierra_net_get_drvinfo(struct net_device *net,
 597                 struct ethtool_drvinfo *info)
 598 {
 599         /* Inherit standard device info */
 600         usbnet_get_drvinfo(net, info);
 601         strncpy(info->driver, driver_name, sizeof info->driver);
 602         strncpy(info->version, DRIVER_VERSION, sizeof info->version);
 603 }
 604
 605 static u32 sierra_net_get_link(struct net_device *net)
 606 {
 607         struct usbnet *dev = netdev_priv(net);
 608         /* Report link is down whenever the interface is down */
 609         return sierra_net_get_private(dev)->link_up && netif_running(net);
 610 }
 611
 612 static const struct ethtool_ops sierra_net_ethtool_ops = {
 613         .get_drvinfo = sierra_net_get_drvinfo,
 614         .get_link = sierra_net_get_link,
 615         .get_msglevel = usbnet_get_msglevel,
 616         .set_msglevel = usbnet_set_msglevel,
 617         .get_settings = usbnet_get_settings,
 618         .set_settings = usbnet_set_settings,
 619         .nway_reset = usbnet_nway_reset,
 620 };
 621
 622 /* MTU can not be more than 1500 bytes, enforce it. */
 623 static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
 624 {
 625         if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
 626                 return -EINVAL;
 627
 628         return usbnet_change_mtu(net, new_mtu);
 629 }
 630
 631 static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
 632 {
 633         int result = 0;
 634         __le16 attrdata;
 635
 636         result = usbnet_read_cmd(dev,
 637                                 /* _u8 vendor specific request */
 638                                 SWI_USB_REQUEST_GET_FW_ATTR,
 639                                 USB_DIR_IN | USB_TYPE_VENDOR,   /* __u8 request type */
 640                                 0x0000,         /* __u16 value not used */
 641                                 0x0000,         /* __u16 index  not used */
 642                                 &attrdata,      /* char *data */
 643                                 sizeof(attrdata)        /* __u16 size */
 644                                 );
 645
 646         if (result < 0)
 647                 return -EIO;
 648
 649         *datap = le16_to_cpu(attrdata);
 650         return result;
 651 }
 652
 653 /*
 654  * collects the bulk endpoints, the status endpoint.
 655  */
 656 static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
 657 {
 658         u8      ifacenum;
 659         u8      numendpoints;
 660         u16     fwattr = 0;
 661         int     status;
 662         struct ethhdr *eth;
 663         struct sierra_net_data *priv;
 664         static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
 665                 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
 666         static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
 667                 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
 668
 669         dev_dbg(&dev->udev->dev, "%s", __func__);
 670
 671         ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
 672         numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
 673         /* We have three endpoints, bulk in and out, and a status */
 674         if (numendpoints != 3) {
 675                 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
 676                         numendpoints);
 677                 return -ENODEV;
 678         }
 679         /* Status endpoint set in usbnet_get_endpoints() */
 680         dev->status = NULL;
 681         status = usbnet_get_endpoints(dev, intf);
 682         if (status < 0) {
 683                 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
 684                         status);
 685                 return -ENODEV;
 686         }
 687         /* Initialize sierra private data */
 688         priv = kzalloc(sizeof *priv, GFP_KERNEL);
 689         if (!priv) {
 690                 dev_err(&dev->udev->dev, "No memory");
 691                 return -ENOMEM;
 692         }
 693
 694         priv->usbnet = dev;
 695         priv->ifnum = ifacenum;
 696         dev->net->netdev_ops = &sierra_net_device_ops;
 697
 698         /* change MAC addr to include, ifacenum, and to be unique */
 699         dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
 700         dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
 701
 702         /* we will have to manufacture ethernet headers, prepare template */
 703         eth = (struct ethhdr *)priv->ethr_hdr_tmpl;
 704         memcpy(&eth->h_dest, dev->net->dev_addr, ETH_ALEN);
 705         eth->h_proto = cpu_to_be16(ETH_P_IP);
 706
 707         /* prepare shutdown message template */
 708         memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
 709         /* set context index initially to 0 - prepares tx hdr template */
 710         sierra_net_set_ctx_index(priv, 0);
 711
 712         /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
 713         dev->rx_urb_size  = SIERRA_NET_RX_URB_SIZE;
 714         if (dev->udev->speed != USB_SPEED_HIGH)
 715                 dev->rx_urb_size  = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
 716
 717         dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
 718         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 719
 720         /* Set up the netdev */
 721         dev->net->flags |= IFF_NOARP;
 722         dev->net->ethtool_ops = &sierra_net_ethtool_ops;
 723         netif_carrier_off(dev->net);
 724
 725         sierra_net_set_private(dev, priv);
 726
 727         priv->kevent_flags = 0;
 728
 729         /* Use the shared workqueue */
 730         INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
 731
 732         /* Only need to do this once */
 733         init_timer(&priv->sync_timer);
 734
 735         /* verify fw attributes */
 736         status = sierra_net_get_fw_attr(dev, &fwattr);
 737         dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
 738
 739         /* test whether firmware supports DHCP */
 740         if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
 741                 /* found incompatible firmware version */
 742                 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
 743                         " versions\n");
 744                 kfree(priv);
 745                 return -ENODEV;
 746         }
 747         /* prepare sync message from template */
 748         memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
 749
 750         /* initiate the sync sequence */
 751         sierra_net_dosync(dev);
 752
 753         return 0;
 754 }
 755
 756 static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
 757 {
 758         int status;
 759         struct sierra_net_data *priv = sierra_net_get_private(dev);
 760
 761         dev_dbg(&dev->udev->dev, "%s", __func__);
 762
 763         /* kill the timer and work */
 764         del_timer_sync(&priv->sync_timer);
 765         cancel_work_sync(&priv->sierra_net_kevent);
 766
 767         /* tell modem we are going away */
 768         status = sierra_net_send_cmd(dev, priv->shdwn_msg,
 769                         sizeof(priv->shdwn_msg), "Shutdown");
 770         if (status < 0)
 771                 netdev_err(dev->net,
 772                         "usb_control_msg failed, status %d\n", status);
 773
 774         sierra_net_set_private(dev, NULL);
 775
 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 #define DIRECT_IP_DEVICE(vend, prod) \
 917         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
 918         .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
 919         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
 920         .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
 921         {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
 922         .driver_info = (unsigned long)&sierra_net_info_direct_ip}
 923
 924 static const struct usb_device_id products[] = {
 925         DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
 926         DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
 927         DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
 928         DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
 929
 930         {}, /* last item */
 931 };
 932 MODULE_DEVICE_TABLE(usb, products);
 933
 934 /* We are based on usbnet, so let it handle the USB driver specifics */
 935 static struct usb_driver sierra_net_driver = {
 936         .name = "sierra_net",
 937         .id_table = products,
 938         .probe = usbnet_probe,
 939         .disconnect = usbnet_disconnect,
 940         .suspend = usbnet_suspend,
 941         .resume = usbnet_resume,
 942         .no_dynamic_id = 1,
 943         .disable_hub_initiated_lpm = 1,
 944 };
 945
 946 module_usb_driver(sierra_net_driver);
 947
 948 MODULE_AUTHOR(DRIVER_AUTHOR);
 949 MODULE_DESCRIPTION(DRIVER_DESC);
 950 MODULE_VERSION(DRIVER_VERSION);
 951 MODULE_LICENSE("GPL");