drivers/net/usb/cdc_mbim.c

   1 /*
   2  * Copyright (c) 2012  Smith Micro Software, Inc.
   3  * Copyright (c) 2012  Bjørn Mork <bjorn@mork.no>
   4  *
   5  * This driver is based on and reuse most of cdc_ncm, which is
   6  * Copyright (C) ST-Ericsson 2010-2012
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/ethtool.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/ip.h>
  18 #include <linux/mii.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/cdc.h>
  21 #include <linux/usb/usbnet.h>
  22 #include <linux/usb/cdc-wdm.h>
  23 #include <linux/usb/cdc_ncm.h>
  24 #include <net/ipv6.h>
  25 #include <net/addrconf.h>
  26
  27 /* alternative VLAN for IP session 0 if not untagged */
  28 #define MBIM_IPS0_VID   4094
  29
  30 /* driver specific data - must match cdc_ncm usage */
  31 struct cdc_mbim_state {
  32         struct cdc_ncm_ctx *ctx;
  33         atomic_t pmcount;
  34         struct usb_driver *subdriver;
  35         unsigned long _unused;
  36         unsigned long flags;
  37 };
  38
  39 /* flags for the cdc_mbim_state.flags field */
  40 enum cdc_mbim_flags {
  41         FLAG_IPS0_VLAN = 1 << 0,        /* IP session 0 is tagged  */
  42 };
  43
  44 /* using a counter to merge subdriver requests with our own into a combined state */
  45 static int cdc_mbim_manage_power(struct usbnet *dev, int on)
  46 {
  47         struct cdc_mbim_state *info = (void *)&dev->data;
  48         int rv = 0;
  49
  50         dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
  51
  52         if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
  53                 /* need autopm_get/put here to ensure the usbcore sees the new value */
  54                 rv = usb_autopm_get_interface(dev->intf);
  55                 dev->intf->needs_remote_wakeup = on;
  56                 if (!rv)
  57                         usb_autopm_put_interface(dev->intf);
  58         }
  59         return 0;
  60 }
  61
  62 static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
  63 {
  64         struct usbnet *dev = usb_get_intfdata(intf);
  65
  66         /* can be called while disconnecting */
  67         if (!dev)
  68                 return 0;
  69
  70         return cdc_mbim_manage_power(dev, status);
  71 }
  72
  73 static int cdc_mbim_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
  74 {
  75         struct usbnet *dev = netdev_priv(netdev);
  76         struct cdc_mbim_state *info = (void *)&dev->data;
  77
  78         /* creation of this VLAN is a request to tag IP session 0 */
  79         if (vid == MBIM_IPS0_VID)
  80                 info->flags |= FLAG_IPS0_VLAN;
  81         else
  82                 if (vid >= 512) /* we don't map these to MBIM session */
  83                         return -EINVAL;
  84         return 0;
  85 }
  86
  87 static int cdc_mbim_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
  88 {
  89         struct usbnet *dev = netdev_priv(netdev);
  90         struct cdc_mbim_state *info = (void *)&dev->data;
  91
  92         /* this is a request for an untagged IP session 0 */
  93         if (vid == MBIM_IPS0_VID)
  94                 info->flags &= ~FLAG_IPS0_VLAN;
  95         return 0;
  96 }
  97
  98 static const struct net_device_ops cdc_mbim_netdev_ops = {
  99         .ndo_open             = usbnet_open,
 100         .ndo_stop             = usbnet_stop,
 101         .ndo_start_xmit       = usbnet_start_xmit,
 102         .ndo_tx_timeout       = usbnet_tx_timeout,
 103         .ndo_get_stats64      = usbnet_get_stats64,
 104         .ndo_change_mtu       = cdc_ncm_change_mtu,
 105         .ndo_set_mac_address  = eth_mac_addr,
 106         .ndo_validate_addr    = eth_validate_addr,
 107         .ndo_vlan_rx_add_vid  = cdc_mbim_rx_add_vid,
 108         .ndo_vlan_rx_kill_vid = cdc_mbim_rx_kill_vid,
 109 };
 110
 111 /* Change the control interface altsetting and update the .driver_info
 112  * pointer if the matching entry after changing class codes points to
 113  * a different struct
 114  */
 115 static int cdc_mbim_set_ctrlalt(struct usbnet *dev, struct usb_interface *intf, u8 alt)
 116 {
 117         struct usb_driver *driver = to_usb_driver(intf->dev.driver);
 118         const struct usb_device_id *id;
 119         struct driver_info *info;
 120         int ret;
 121
 122         ret = usb_set_interface(dev->udev,
 123                                 intf->cur_altsetting->desc.bInterfaceNumber,
 124                                 alt);
 125         if (ret)
 126                 return ret;
 127
 128         id = usb_match_id(intf, driver->id_table);
 129         if (!id)
 130                 return -ENODEV;
 131
 132         info = (struct driver_info *)id->driver_info;
 133         if (info != dev->driver_info) {
 134                 dev_dbg(&intf->dev, "driver_info updated to '%s'\n",
 135                         info->description);
 136                 dev->driver_info = info;
 137         }
 138         return 0;
 139 }
 140
 141 static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
 142 {
 143         struct cdc_ncm_ctx *ctx;
 144         struct usb_driver *subdriver = ERR_PTR(-ENODEV);
 145         int ret = -ENODEV;
 146         u8 data_altsetting = 1;
 147         struct cdc_mbim_state *info = (void *)&dev->data;
 148
 149         /* should we change control altsetting on a NCM/MBIM function? */
 150         if (cdc_ncm_select_altsetting(intf) == CDC_NCM_COMM_ALTSETTING_MBIM) {
 151                 data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
 152                 ret = cdc_mbim_set_ctrlalt(dev, intf, CDC_NCM_COMM_ALTSETTING_MBIM);
 153                 if (ret)
 154                         goto err;
 155                 ret = -ENODEV;
 156         }
 157
 158         /* we will hit this for NCM/MBIM functions if prefer_mbim is false */
 159         if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
 160                 goto err;
 161
 162         ret = cdc_ncm_bind_common(dev, intf, data_altsetting, dev->driver_info->data);
 163         if (ret)
 164                 goto err;
 165
 166         ctx = info->ctx;
 167
 168         /* The MBIM descriptor and the status endpoint are required */
 169         if (ctx->mbim_desc && dev->status)
 170                 subdriver = usb_cdc_wdm_register(ctx->control,
 171                                                  &dev->status->desc,
 172                                                  le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
 173                                                  cdc_mbim_wdm_manage_power);
 174         if (IS_ERR(subdriver)) {
 175                 ret = PTR_ERR(subdriver);
 176                 cdc_ncm_unbind(dev, intf);
 177                 goto err;
 178         }
 179
 180         /* can't let usbnet use the interrupt endpoint */
 181         dev->status = NULL;
 182         info->subdriver = subdriver;
 183
 184         /* MBIM cannot do ARP */
 185         dev->net->flags |= IFF_NOARP;
 186
 187         /* no need to put the VLAN tci in the packet headers */
 188         dev->net->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_FILTER;
 189
 190         /* monitor VLAN additions and removals */
 191         dev->net->netdev_ops = &cdc_mbim_netdev_ops;
 192 err:
 193         return ret;
 194 }
 195
 196 static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
 197 {
 198         struct cdc_mbim_state *info = (void *)&dev->data;
 199         struct cdc_ncm_ctx *ctx = info->ctx;
 200
 201         /* disconnect subdriver from control interface */
 202         if (info->subdriver && info->subdriver->disconnect)
 203                 info->subdriver->disconnect(ctx->control);
 204         info->subdriver = NULL;
 205
 206         /* let NCM unbind clean up both control and data interface */
 207         cdc_ncm_unbind(dev, intf);
 208 }
 209
 210 /* verify that the ethernet protocol is IPv4 or IPv6 */
 211 static bool is_ip_proto(__be16 proto)
 212 {
 213         switch (proto) {
 214         case htons(ETH_P_IP):
 215         case htons(ETH_P_IPV6):
 216                 return true;
 217         }
 218         return false;
 219 }
 220
 221 static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
 222 {
 223         struct sk_buff *skb_out;
 224         struct cdc_mbim_state *info = (void *)&dev->data;
 225         struct cdc_ncm_ctx *ctx = info->ctx;
 226         __le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
 227         u16 tci = 0;
 228         bool is_ip;
 229         u8 *c;
 230
 231         if (!ctx)
 232                 goto error;
 233
 234         if (skb) {
 235                 if (skb->len <= ETH_HLEN)
 236                         goto error;
 237
 238                 /* Some applications using e.g. packet sockets will
 239                  * bypass the VLAN acceleration and create tagged
 240                  * ethernet frames directly.  We primarily look for
 241                  * the accelerated out-of-band tag, but fall back if
 242                  * required
 243                  */
 244                 skb_reset_mac_header(skb);
 245                 if (vlan_get_tag(skb, &tci) < 0 && skb->len > VLAN_ETH_HLEN &&
 246                     __vlan_get_tag(skb, &tci) == 0) {
 247                         is_ip = is_ip_proto(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
 248                         skb_pull(skb, VLAN_ETH_HLEN);
 249                 } else {
 250                         is_ip = is_ip_proto(eth_hdr(skb)->h_proto);
 251                         skb_pull(skb, ETH_HLEN);
 252                 }
 253
 254                 /* Is IP session <0> tagged too? */
 255                 if (info->flags & FLAG_IPS0_VLAN) {
 256                         /* drop all untagged packets */
 257                         if (!tci)
 258                                 goto error;
 259                         /* map MBIM_IPS0_VID to IPS<0> */
 260                         if (tci == MBIM_IPS0_VID)
 261                                 tci = 0;
 262                 }
 263
 264                 /* mapping VLANs to MBIM sessions:
 265                  *   no tag     => IPS session <0> if !FLAG_IPS0_VLAN
 266                  *   1 - 255    => IPS session <vlanid>
 267                  *   256 - 511  => DSS session <vlanid - 256>
 268                  *   512 - 4093 => unsupported, drop
 269                  *   4094       => IPS session <0> if FLAG_IPS0_VLAN
 270                  */
 271
 272                 switch (tci & 0x0f00) {
 273                 case 0x0000: /* VLAN ID 0 - 255 */
 274                         if (!is_ip)
 275                                 goto error;
 276                         c = (u8 *)&sign;
 277                         c[3] = tci;
 278                         break;
 279                 case 0x0100: /* VLAN ID 256 - 511 */
 280                         if (is_ip)
 281                                 goto error;
 282                         sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
 283                         c = (u8 *)&sign;
 284                         c[3] = tci;
 285                         break;
 286                 default:
 287                         netif_err(dev, tx_err, dev->net,
 288                                   "unsupported tci=0x%04x\n", tci);
 289                         goto error;
 290                 }
 291         }
 292
 293         spin_lock_bh(&ctx->mtx);
 294         skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign);
 295         spin_unlock_bh(&ctx->mtx);
 296         return skb_out;
 297
 298 error:
 299         if (skb)
 300                 dev_kfree_skb_any(skb);
 301
 302         return NULL;
 303 }
 304
 305 /* Some devices are known to send Neigbor Solicitation messages and
 306  * require Neigbor Advertisement replies.  The IPv6 core will not
 307  * respond since IFF_NOARP is set, so we must handle them ourselves.
 308  */
 309 static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
 310 {
 311         struct ipv6hdr *iph = (void *)buf;
 312         struct nd_msg *msg = (void *)(iph + 1);
 313         struct net_device *netdev;
 314         struct inet6_dev *in6_dev;
 315         bool is_router;
 316
 317         /* we'll only respond to requests from unicast addresses to
 318          * our solicited node addresses.
 319          */
 320         if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
 321             !(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
 322                 return;
 323
 324         /* need to send the NA on the VLAN dev, if any */
 325         rcu_read_lock();
 326         if (tci) {
 327                 netdev = __vlan_find_dev_deep_rcu(dev->net, htons(ETH_P_8021Q),
 328                                                   tci);
 329                 if (!netdev) {
 330                         rcu_read_unlock();
 331                         return;
 332                 }
 333         } else {
 334                 netdev = dev->net;
 335         }
 336         dev_hold(netdev);
 337         rcu_read_unlock();
 338
 339         in6_dev = in6_dev_get(netdev);
 340         if (!in6_dev)
 341                 goto out;
 342         is_router = !!in6_dev->cnf.forwarding;
 343         in6_dev_put(in6_dev);
 344
 345         /* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
 346         ipv6_stub->ndisc_send_na(netdev, &iph->saddr, &msg->target,
 347                                  is_router /* router */,
 348                                  true /* solicited */,
 349                                  false /* override */,
 350                                  true /* inc_opt */);
 351 out:
 352         dev_put(netdev);
 353 }
 354
 355 static bool is_neigh_solicit(u8 *buf, size_t len)
 356 {
 357         struct ipv6hdr *iph = (void *)buf;
 358         struct nd_msg *msg = (void *)(iph + 1);
 359
 360         return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
 361                 iph->nexthdr == IPPROTO_ICMPV6 &&
 362                 msg->icmph.icmp6_code == 0 &&
 363                 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION);
 364 }
 365
 366
 367 static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
 368 {
 369         __be16 proto = htons(ETH_P_802_3);
 370         struct sk_buff *skb = NULL;
 371
 372         if (tci < 256 || tci == MBIM_IPS0_VID) { /* IPS session? */
 373                 if (len < sizeof(struct iphdr))
 374                         goto err;
 375
 376                 switch (*buf & 0xf0) {
 377                 case 0x40:
 378                         proto = htons(ETH_P_IP);
 379                         break;
 380                 case 0x60:
 381                         if (is_neigh_solicit(buf, len))
 382                                 do_neigh_solicit(dev, buf, tci);
 383                         proto = htons(ETH_P_IPV6);
 384                         break;
 385                 default:
 386                         goto err;
 387                 }
 388         }
 389
 390         skb = netdev_alloc_skb_ip_align(dev->net,  len + ETH_HLEN);
 391         if (!skb)
 392                 goto err;
 393
 394         /* add an ethernet header */
 395         skb_put(skb, ETH_HLEN);
 396         skb_reset_mac_header(skb);
 397         eth_hdr(skb)->h_proto = proto;
 398         eth_zero_addr(eth_hdr(skb)->h_source);
 399         memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
 400
 401         /* add datagram */
 402         skb_put_data(skb, buf, len);
 403
 404         /* map MBIM session to VLAN */
 405         if (tci)
 406                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tci);
 407 err:
 408         return skb;
 409 }
 410
 411 static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
 412 {
 413         struct sk_buff *skb;
 414         struct cdc_mbim_state *info = (void *)&dev->data;
 415         struct cdc_ncm_ctx *ctx = info->ctx;
 416         int len;
 417         int nframes;
 418         int x;
 419         int offset;
 420         struct usb_cdc_ncm_ndp16 *ndp16;
 421         struct usb_cdc_ncm_dpe16 *dpe16;
 422         int ndpoffset;
 423         int loopcount = 50; /* arbitrary max preventing infinite loop */
 424         u32 payload = 0;
 425         u8 *c;
 426         u16 tci;
 427
 428         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
 429         if (ndpoffset < 0)
 430                 goto error;
 431
 432 next_ndp:
 433         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
 434         if (nframes < 0)
 435                 goto error;
 436
 437         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
 438
 439         switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
 440         case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
 441                 c = (u8 *)&ndp16->dwSignature;
 442                 tci = c[3];
 443                 /* tag IPS<0> packets too if MBIM_IPS0_VID exists */
 444                 if (!tci && info->flags & FLAG_IPS0_VLAN)
 445                         tci = MBIM_IPS0_VID;
 446                 break;
 447         case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
 448                 c = (u8 *)&ndp16->dwSignature;
 449                 tci = c[3] + 256;
 450                 break;
 451         default:
 452                 netif_dbg(dev, rx_err, dev->net,
 453                           "unsupported NDP signature <0x%08x>\n",
 454                           le32_to_cpu(ndp16->dwSignature));
 455                 goto err_ndp;
 456
 457         }
 458
 459         dpe16 = ndp16->dpe16;
 460         for (x = 0; x < nframes; x++, dpe16++) {
 461                 offset = le16_to_cpu(dpe16->wDatagramIndex);
 462                 len = le16_to_cpu(dpe16->wDatagramLength);
 463
 464                 /*
 465                  * CDC NCM ch. 3.7
 466                  * All entries after first NULL entry are to be ignored
 467                  */
 468                 if ((offset == 0) || (len == 0)) {
 469                         if (!x)
 470                                 goto err_ndp; /* empty NTB */
 471                         break;
 472                 }
 473
 474                 /* sanity checking */
 475                 if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
 476                         netif_dbg(dev, rx_err, dev->net,
 477                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
 478                                   x, offset, len, skb_in);
 479                         if (!x)
 480                                 goto err_ndp;
 481                         break;
 482                 } else {
 483                         skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
 484                         if (!skb)
 485                                 goto error;
 486                         usbnet_skb_return(dev, skb);
 487                         payload += len; /* count payload bytes in this NTB */
 488                 }
 489         }
 490 err_ndp:
 491         /* are there more NDPs to process? */
 492         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
 493         if (ndpoffset && loopcount--)
 494                 goto next_ndp;
 495
 496         /* update stats */
 497         ctx->rx_overhead += skb_in->len - payload;
 498         ctx->rx_ntbs++;
 499
 500         return 1;
 501 error:
 502         return 0;
 503 }
 504
 505 static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
 506 {
 507         int ret = -ENODEV;
 508         struct usbnet *dev = usb_get_intfdata(intf);
 509         struct cdc_mbim_state *info = (void *)&dev->data;
 510         struct cdc_ncm_ctx *ctx = info->ctx;
 511
 512         if (!ctx)
 513                 goto error;
 514
 515         /*
 516          * Both usbnet_suspend() and subdriver->suspend() MUST return 0
 517          * in system sleep context, otherwise, the resume callback has
 518          * to recover device from previous suspend failure.
 519          */
 520         ret = usbnet_suspend(intf, message);
 521         if (ret < 0)
 522                 goto error;
 523
 524         if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
 525                 ret = info->subdriver->suspend(intf, message);
 526         if (ret < 0)
 527                 usbnet_resume(intf);
 528
 529 error:
 530         return ret;
 531 }
 532
 533 static int cdc_mbim_resume(struct usb_interface *intf)
 534 {
 535         int  ret = 0;
 536         struct usbnet *dev = usb_get_intfdata(intf);
 537         struct cdc_mbim_state *info = (void *)&dev->data;
 538         struct cdc_ncm_ctx *ctx = info->ctx;
 539         bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);
 540
 541         if (callsub)
 542                 ret = info->subdriver->resume(intf);
 543         if (ret < 0)
 544                 goto err;
 545         ret = usbnet_resume(intf);
 546         if (ret < 0 && callsub)
 547                 info->subdriver->suspend(intf, PMSG_SUSPEND);
 548 err:
 549         return ret;
 550 }
 551
 552 static const struct driver_info cdc_mbim_info = {
 553         .description = "CDC MBIM",
 554         .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
 555         .bind = cdc_mbim_bind,
 556         .unbind = cdc_mbim_unbind,
 557         .manage_power = cdc_mbim_manage_power,
 558         .rx_fixup = cdc_mbim_rx_fixup,
 559         .tx_fixup = cdc_mbim_tx_fixup,
 560 };
 561
 562 /* MBIM and NCM devices should not need a ZLP after NTBs with
 563  * dwNtbOutMaxSize length. Nevertheless, a number of devices from
 564  * different vendor IDs will fail unless we send ZLPs, forcing us
 565  * to make this the default.
 566  *
 567  * This default may cause a performance penalty for spec conforming
 568  * devices wanting to take advantage of optimizations possible without
 569  * ZLPs.  A whitelist is added in an attempt to avoid this for devices
 570  * known to conform to the MBIM specification.
 571  *
 572  * All known devices supporting NCM compatibility mode are also
 573  * conforming to the NCM and MBIM specifications. For this reason, the
 574  * NCM subclass entry is also in the ZLP whitelist.
 575  */
 576 static const struct driver_info cdc_mbim_info_zlp = {
 577         .description = "CDC MBIM",
 578         .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
 579         .bind = cdc_mbim_bind,
 580         .unbind = cdc_mbim_unbind,
 581         .manage_power = cdc_mbim_manage_power,
 582         .rx_fixup = cdc_mbim_rx_fixup,
 583         .tx_fixup = cdc_mbim_tx_fixup,
 584 };
 585
 586 /* The spefication explicitly allows NDPs to be placed anywhere in the
 587  * frame, but some devices fail unless the NDP is placed after the IP
 588  * packets.  Using the CDC_NCM_FLAG_NDP_TO_END flags to force this
 589  * behaviour.
 590  *
 591  * Note: The current implementation of this feature restricts each NTB
 592  * to a single NDP, implying that multiplexed sessions cannot share an
 593  * NTB. This might affect performace for multiplexed sessions.
 594  */
 595 static const struct driver_info cdc_mbim_info_ndp_to_end = {
 596         .description = "CDC MBIM",
 597         .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
 598         .bind = cdc_mbim_bind,
 599         .unbind = cdc_mbim_unbind,
 600         .manage_power = cdc_mbim_manage_power,
 601         .rx_fixup = cdc_mbim_rx_fixup,
 602         .tx_fixup = cdc_mbim_tx_fixup,
 603         .data = CDC_NCM_FLAG_NDP_TO_END,
 604 };
 605
 606 /* Some modems (e.g. Telit LE922A6) do not work properly with altsetting
 607  * toggle done in cdc_ncm_bind_common. CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
 608  * flag is used to avoid this procedure.
 609  */
 610 static const struct driver_info cdc_mbim_info_avoid_altsetting_toggle = {
 611         .description = "CDC MBIM",
 612         .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
 613         .bind = cdc_mbim_bind,
 614         .unbind = cdc_mbim_unbind,
 615         .manage_power = cdc_mbim_manage_power,
 616         .rx_fixup = cdc_mbim_rx_fixup,
 617         .tx_fixup = cdc_mbim_tx_fixup,
 618         .data = CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE,
 619 };
 620
 621 static const struct usb_device_id mbim_devs[] = {
 622         /* This duplicate NCM entry is intentional. MBIM devices can
 623          * be disguised as NCM by default, and this is necessary to
 624          * allow us to bind the correct driver_info to such devices.
 625          *
 626          * bind() will sort out this for us, selecting the correct
 627          * entry and reject the other
 628          */
 629         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
 630           .driver_info = (unsigned long)&cdc_mbim_info,
 631         },
 632         /* ZLP conformance whitelist: All Ericsson MBIM devices */
 633         { USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 634           .driver_info = (unsigned long)&cdc_mbim_info,
 635         },
 636
 637         /* Some Huawei devices, ME906s-158 (12d1:15c1) and E3372
 638          * (12d1:157d), are known to fail unless the NDP is placed
 639          * after the IP packets.  Applying the quirk to all Huawei
 640          * devices is broader than necessary, but harmless.
 641          */
 642         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 643           .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end,
 644         },
 645
 646         /* The HP lt4132 (03f0:a31d) is a rebranded Huawei ME906s-158,
 647          * therefore it too requires the above "NDP to end" quirk.
 648          */
 649         { USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0xa31d, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 650           .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end,
 651         },
 652
 653         /* Telit LE922A6 in MBIM composition */
 654         { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1041, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 655           .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle,
 656         },
 657
 658         /* default entry */
 659         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
 660           .driver_info = (unsigned long)&cdc_mbim_info_zlp,
 661         },
 662         {
 663         },
 664 };
 665 MODULE_DEVICE_TABLE(usb, mbim_devs);
 666
 667 static struct usb_driver cdc_mbim_driver = {
 668         .name = "cdc_mbim",
 669         .id_table = mbim_devs,
 670         .probe = usbnet_probe,
 671         .disconnect = usbnet_disconnect,
 672         .suspend = cdc_mbim_suspend,
 673         .resume = cdc_mbim_resume,
 674         .reset_resume = cdc_mbim_resume,
 675         .supports_autosuspend = 1,
 676         .disable_hub_initiated_lpm = 1,
 677 };
 678 module_usb_driver(cdc_mbim_driver);
 679
 680 MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
 681 MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
 682 MODULE_DESCRIPTION("USB CDC MBIM host driver");
 683 MODULE_LICENSE("GPL");