drivers/net/usb/cdc

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This source file includes following definitions.
cdc_ncm_get_sset_count
cdc_ncm_get_ethtool_stats
cdc_ncm_get_strings
cdc_ncm_check_rx_max
cdc_ncm_check_tx_max
cdc_ncm_show_min_tx_pkt
cdc_ncm_show_rx_max
cdc_ncm_show_tx_max
cdc_ncm_show_tx_timer_usecs
cdc_ncm_store_min_tx_pkt
cdc_ncm_store_rx_max
cdc_ncm_store_tx_max
cdc_ncm_store_tx_timer_usecs
ndp_to_end_show
ndp_to_end_store
cdc_ncm_update_rxtx_max
cdc_ncm_flags
cdc_ncm_eth_hlen
cdc_ncm_min_dgram_size
cdc_ncm_max_dgram_size
cdc_ncm_init
cdc_ncm_set_dgram_size
cdc_ncm_fix_modulus
cdc_ncm_setup
cdc_ncm_find_endpoints
cdc_ncm_free
cdc_ncm_change_mtu
cdc_ncm_bind_common
cdc_ncm_unbind
cdc_ncm_select_altsetting
cdc_ncm_bind
cdc_ncm_align_tail
cdc_ncm_fill_tx_frame
cdc_ncm_tx_timeout_start
cdc_ncm_tx_timer_cb
cdc_ncm_txpath_bh
cdc_ncm_tx_fixup
cdc_ncm_rx_verify_nth16
cdc_ncm_rx_verify_ndp16
cdc_ncm_rx_fixup
cdc_ncm_speed_change
cdc_ncm_status
   1 /*
   2  * cdc_ncm.c
   3  *
   4  * Copyright (C) ST-Ericsson 2010-2012
   5  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
   6  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
   7  *
   8  * USB Host Driver for Network Control Model (NCM)
   9  * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
  10  *
  11  * The NCM encoding, decoding and initialization logic
  12  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
  13  *
  14  * This software is available to you under a choice of one of two
  15  * licenses. You may choose this file to be licensed under the terms
  16  * of the GNU General Public License (GPL) Version 2 or the 2-clause
  17  * BSD license listed below:
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in the
  26  *    documentation and/or other materials provided with the distribution.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40 
  41 #include <linux/module.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/ctype.h>
  44 #include <linux/etherdevice.h>
  45 #include <linux/ethtool.h>
  46 #include <linux/workqueue.h>
  47 #include <linux/mii.h>
  48 #include <linux/crc32.h>
  49 #include <linux/usb.h>
  50 #include <linux/hrtimer.h>
  51 #include <linux/atomic.h>
  52 #include <linux/usb/usbnet.h>
  53 #include <linux/usb/cdc.h>
  54 #include <linux/usb/cdc_ncm.h>
  55 
  56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
  57 static bool prefer_mbim = true;
  58 #else
  59 static bool prefer_mbim;
  60 #endif
  61 module_param(prefer_mbim, bool, 0644);
  62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
  63 
  64 static void cdc_ncm_txpath_bh(unsigned long param);
  65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
  66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
  67 static struct usb_driver cdc_ncm_driver;
  68 
  69 struct cdc_ncm_stats {
  70         char stat_string[ETH_GSTRING_LEN];
  71         int sizeof_stat;
  72         int stat_offset;
  73 };
  74 
  75 #define CDC_NCM_STAT(str, m) { \
  76                 .stat_string = str, \
  77                 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
  78                 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
  79 #define CDC_NCM_SIMPLE_STAT(m)  CDC_NCM_STAT(__stringify(m), m)
  80 
  81 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
  82         CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
  83         CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
  84         CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
  85         CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
  86         CDC_NCM_SIMPLE_STAT(tx_overhead),
  87         CDC_NCM_SIMPLE_STAT(tx_ntbs),
  88         CDC_NCM_SIMPLE_STAT(rx_overhead),
  89         CDC_NCM_SIMPLE_STAT(rx_ntbs),
  90 };
  91 
  92 #define CDC_NCM_LOW_MEM_MAX_CNT 10
  93 
  94 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
  95 {
  96         switch (sset) {
  97         case ETH_SS_STATS:
  98                 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
  99         default:
 100                 return -EOPNOTSUPP;
 101         }
 102 }
 103 
 104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
 105                                     struct ethtool_stats __always_unused *stats,
 106                                     u64 *data)
 107 {
 108         struct usbnet *dev = netdev_priv(netdev);
 109         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 110         int i;
 111         char *p = NULL;
 112 
 113         for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
 114                 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
 115                 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 116         }
 117 }
 118 
 119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
 120 {
 121         u8 *p = data;
 122         int i;
 123 
 124         switch (stringset) {
 125         case ETH_SS_STATS:
 126                 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
 127                         memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
 128                         p += ETH_GSTRING_LEN;
 129                 }
 130         }
 131 }
 132 
 133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
 134 
 135 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
 136         .get_link          = usbnet_get_link,
 137         .nway_reset        = usbnet_nway_reset,
 138         .get_drvinfo       = usbnet_get_drvinfo,
 139         .get_msglevel      = usbnet_get_msglevel,
 140         .set_msglevel      = usbnet_set_msglevel,
 141         .get_ts_info       = ethtool_op_get_ts_info,
 142         .get_sset_count    = cdc_ncm_get_sset_count,
 143         .get_strings       = cdc_ncm_get_strings,
 144         .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
 145         .get_link_ksettings      = usbnet_get_link_ksettings,
 146         .set_link_ksettings      = usbnet_set_link_ksettings,
 147 };
 148 
 149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
 150 {
 151         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 152         u32 val, max, min;
 153 
 154         /* clamp new_rx to sane values */
 155         min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
 156         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
 157 
 158         /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
 159         if (max < min) {
 160                 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
 161                          le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
 162                 max = min;
 163         }
 164 
 165         val = clamp_t(u32, new_rx, min, max);
 166         if (val != new_rx)
 167                 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
 168 
 169         return val;
 170 }
 171 
 172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
 173 {
 174         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 175         u32 val, max, min;
 176 
 177         /* clamp new_tx to sane values */
 178         min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
 179         max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
 180 
 181         /* some devices set dwNtbOutMaxSize too low for the above default */
 182         min = min(min, max);
 183 
 184         val = clamp_t(u32, new_tx, min, max);
 185         if (val != new_tx)
 186                 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
 187 
 188         return val;
 189 }
 190 
 191 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
 192 {
 193         struct usbnet *dev = netdev_priv(to_net_dev(d));
 194         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 195 
 196         return sprintf(buf, "%u\n", ctx->min_tx_pkt);
 197 }
 198 
 199 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
 200 {
 201         struct usbnet *dev = netdev_priv(to_net_dev(d));
 202         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 203 
 204         return sprintf(buf, "%u\n", ctx->rx_max);
 205 }
 206 
 207 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
 208 {
 209         struct usbnet *dev = netdev_priv(to_net_dev(d));
 210         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 211 
 212         return sprintf(buf, "%u\n", ctx->tx_max);
 213 }
 214 
 215 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
 216 {
 217         struct usbnet *dev = netdev_priv(to_net_dev(d));
 218         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 219 
 220         return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
 221 }
 222 
 223 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
 224 {
 225         struct usbnet *dev = netdev_priv(to_net_dev(d));
 226         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 227         unsigned long val;
 228 
 229         /* no need to restrict values - anything from 0 to infinity is OK */
 230         if (kstrtoul(buf, 0, &val))
 231                 return -EINVAL;
 232 
 233         ctx->min_tx_pkt = val;
 234         return len;
 235 }
 236 
 237 static ssize_t cdc_ncm_store_rx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
 238 {
 239         struct usbnet *dev = netdev_priv(to_net_dev(d));
 240         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 241         unsigned long val;
 242 
 243         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
 244                 return -EINVAL;
 245 
 246         cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
 247         return len;
 248 }
 249 
 250 static ssize_t cdc_ncm_store_tx_max(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
 251 {
 252         struct usbnet *dev = netdev_priv(to_net_dev(d));
 253         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 254         unsigned long val;
 255 
 256         if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
 257                 return -EINVAL;
 258 
 259         cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
 260         return len;
 261 }
 262 
 263 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
 264 {
 265         struct usbnet *dev = netdev_priv(to_net_dev(d));
 266         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 267         ssize_t ret;
 268         unsigned long val;
 269 
 270         ret = kstrtoul(buf, 0, &val);
 271         if (ret)
 272                 return ret;
 273         if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
 274                 return -EINVAL;
 275 
 276         spin_lock_bh(&ctx->mtx);
 277         ctx->timer_interval = val * NSEC_PER_USEC;
 278         if (!ctx->timer_interval)
 279                 ctx->tx_timer_pending = 0;
 280         spin_unlock_bh(&ctx->mtx);
 281         return len;
 282 }
 283 
 284 static DEVICE_ATTR(min_tx_pkt, 0644, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
 285 static DEVICE_ATTR(rx_max, 0644, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
 286 static DEVICE_ATTR(tx_max, 0644, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
 287 static DEVICE_ATTR(tx_timer_usecs, 0644, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
 288 
 289 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
 290 {
 291         struct usbnet *dev = netdev_priv(to_net_dev(d));
 292         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 293 
 294         return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
 295 }
 296 
 297 static ssize_t ndp_to_end_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
 298 {
 299         struct usbnet *dev = netdev_priv(to_net_dev(d));
 300         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 301         bool enable;
 302 
 303         if (strtobool(buf, &enable))
 304                 return -EINVAL;
 305 
 306         /* no change? */
 307         if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
 308                 return len;
 309 
 310         if (enable && !ctx->delayed_ndp16) {
 311                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
 312                 if (!ctx->delayed_ndp16)
 313                         return -ENOMEM;
 314         }
 315 
 316         /* flush pending data before changing flag */
 317         netif_tx_lock_bh(dev->net);
 318         usbnet_start_xmit(NULL, dev->net);
 319         spin_lock_bh(&ctx->mtx);
 320         if (enable)
 321                 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
 322         else
 323                 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
 324         spin_unlock_bh(&ctx->mtx);
 325         netif_tx_unlock_bh(dev->net);
 326 
 327         return len;
 328 }
 329 static DEVICE_ATTR_RW(ndp_to_end);
 330 
 331 #define NCM_PARM_ATTR(name, format, tocpu)                              \
 332 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
 333 { \
 334         struct usbnet *dev = netdev_priv(to_net_dev(d)); \
 335         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
 336         return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));    \
 337 } \
 338 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
 339 
 340 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
 341 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
 342 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
 343 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
 344 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
 345 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
 346 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
 347 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
 348 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
 349 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
 350 
 351 static struct attribute *cdc_ncm_sysfs_attrs[] = {
 352         &dev_attr_min_tx_pkt.attr,
 353         &dev_attr_ndp_to_end.attr,
 354         &dev_attr_rx_max.attr,
 355         &dev_attr_tx_max.attr,
 356         &dev_attr_tx_timer_usecs.attr,
 357         &dev_attr_bmNtbFormatsSupported.attr,
 358         &dev_attr_dwNtbInMaxSize.attr,
 359         &dev_attr_wNdpInDivisor.attr,
 360         &dev_attr_wNdpInPayloadRemainder.attr,
 361         &dev_attr_wNdpInAlignment.attr,
 362         &dev_attr_dwNtbOutMaxSize.attr,
 363         &dev_attr_wNdpOutDivisor.attr,
 364         &dev_attr_wNdpOutPayloadRemainder.attr,
 365         &dev_attr_wNdpOutAlignment.attr,
 366         &dev_attr_wNtbOutMaxDatagrams.attr,
 367         NULL,
 368 };
 369 
 370 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
 371         .name = "cdc_ncm",
 372         .attrs = cdc_ncm_sysfs_attrs,
 373 };
 374 
 375 /* handle rx_max and tx_max changes */
 376 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
 377 {
 378         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 379         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 380         u32 val;
 381 
 382         val = cdc_ncm_check_rx_max(dev, new_rx);
 383 
 384         /* inform device about NTB input size changes */
 385         if (val != ctx->rx_max) {
 386                 __le32 dwNtbInMaxSize = cpu_to_le32(val);
 387 
 388                 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
 389 
 390                 /* tell device to use new size */
 391                 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
 392                                      USB_TYPE_CLASS | USB_DIR_OUT
 393                                      | USB_RECIP_INTERFACE,
 394                                      0, iface_no, &dwNtbInMaxSize, 4) < 0)
 395                         dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
 396                 else
 397                         ctx->rx_max = val;
 398         }
 399 
 400         /* usbnet use these values for sizing rx queues */
 401         if (dev->rx_urb_size != ctx->rx_max) {
 402                 dev->rx_urb_size = ctx->rx_max;
 403                 if (netif_running(dev->net))
 404                         usbnet_unlink_rx_urbs(dev);
 405         }
 406 
 407         val = cdc_ncm_check_tx_max(dev, new_tx);
 408         if (val != ctx->tx_max)
 409                 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
 410 
 411         /* Adding a pad byte here if necessary simplifies the handling
 412          * in cdc_ncm_fill_tx_frame, making tx_max always represent
 413          * the real skb max size.
 414          *
 415          * We cannot use dev->maxpacket here because this is called from
 416          * .bind which is called before usbnet sets up dev->maxpacket
 417          */
 418         if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
 419             val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
 420                 val++;
 421 
 422         /* we might need to flush any pending tx buffers if running */
 423         if (netif_running(dev->net) && val > ctx->tx_max) {
 424                 netif_tx_lock_bh(dev->net);
 425                 usbnet_start_xmit(NULL, dev->net);
 426                 /* make sure tx_curr_skb is reallocated if it was empty */
 427                 if (ctx->tx_curr_skb) {
 428                         dev_kfree_skb_any(ctx->tx_curr_skb);
 429                         ctx->tx_curr_skb = NULL;
 430                 }
 431                 ctx->tx_max = val;
 432                 netif_tx_unlock_bh(dev->net);
 433         } else {
 434                 ctx->tx_max = val;
 435         }
 436 
 437         dev->hard_mtu = ctx->tx_max;
 438 
 439         /* max qlen depend on hard_mtu and rx_urb_size */
 440         usbnet_update_max_qlen(dev);
 441 
 442         /* never pad more than 3 full USB packets per transfer */
 443         ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
 444                                   CDC_NCM_MIN_TX_PKT, ctx->tx_max);
 445 }
 446 
 447 /* helpers for NCM and MBIM differences */
 448 static u8 cdc_ncm_flags(struct usbnet *dev)
 449 {
 450         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 451 
 452         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
 453                 return ctx->mbim_desc->bmNetworkCapabilities;
 454         if (ctx->func_desc)
 455                 return ctx->func_desc->bmNetworkCapabilities;
 456         return 0;
 457 }
 458 
 459 static int cdc_ncm_eth_hlen(struct usbnet *dev)
 460 {
 461         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
 462                 return 0;
 463         return ETH_HLEN;
 464 }
 465 
 466 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
 467 {
 468         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
 469                 return CDC_MBIM_MIN_DATAGRAM_SIZE;
 470         return CDC_NCM_MIN_DATAGRAM_SIZE;
 471 }
 472 
 473 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
 474 {
 475         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 476 
 477         if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
 478                 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
 479         if (ctx->ether_desc)
 480                 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
 481         return CDC_NCM_MAX_DATAGRAM_SIZE;
 482 }
 483 
 484 /* initial one-time device setup.  MUST be called with the data interface
 485  * in altsetting 0
 486  */
 487 static int cdc_ncm_init(struct usbnet *dev)
 488 {
 489         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 490         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 491         int err;
 492 
 493         err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
 494                               USB_TYPE_CLASS | USB_DIR_IN
 495                               |USB_RECIP_INTERFACE,
 496                               0, iface_no, &ctx->ncm_parm,
 497                               sizeof(ctx->ncm_parm));
 498         if (err < 0) {
 499                 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
 500                 return err; /* GET_NTB_PARAMETERS is required */
 501         }
 502 
 503         /* set CRC Mode */
 504         if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
 505                 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
 506                 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
 507                                        USB_TYPE_CLASS | USB_DIR_OUT
 508                                        | USB_RECIP_INTERFACE,
 509                                        USB_CDC_NCM_CRC_NOT_APPENDED,
 510                                        iface_no, NULL, 0);
 511                 if (err < 0)
 512                         dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
 513         }
 514 
 515         /* set NTB format, if both formats are supported.
 516          *
 517          * "The host shall only send this command while the NCM Data
 518          *  Interface is in alternate setting 0."
 519          */
 520         if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
 521                                                 USB_CDC_NCM_NTB32_SUPPORTED) {
 522                 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
 523                 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
 524                                        USB_TYPE_CLASS | USB_DIR_OUT
 525                                        | USB_RECIP_INTERFACE,
 526                                        USB_CDC_NCM_NTB16_FORMAT,
 527                                        iface_no, NULL, 0);
 528                 if (err < 0)
 529                         dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
 530         }
 531 
 532         /* set initial device values */
 533         ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
 534         ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
 535         ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
 536         ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
 537         ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
 538         /* devices prior to NCM Errata shall set this field to zero */
 539         ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
 540 
 541         dev_dbg(&dev->intf->dev,
 542                 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
 543                 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
 544                 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
 545 
 546         /* max count of tx datagrams */
 547         if ((ctx->tx_max_datagrams == 0) ||
 548                         (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
 549                 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
 550 
 551         /* set up maximum NDP size */
 552         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
 553 
 554         /* initial coalescing timer interval */
 555         ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
 556 
 557         return 0;
 558 }
 559 
 560 /* set a new max datagram size */
 561 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
 562 {
 563         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 564         u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
 565         __le16 max_datagram_size;
 566         u16 mbim_mtu;
 567         int err;
 568 
 569         /* set default based on descriptors */
 570         ctx->max_datagram_size = clamp_t(u32, new_size,
 571                                          cdc_ncm_min_dgram_size(dev),
 572                                          CDC_NCM_MAX_DATAGRAM_SIZE);
 573 
 574         /* inform the device about the selected Max Datagram Size? */
 575         if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
 576                 goto out;
 577 
 578         /* read current mtu value from device */
 579         err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
 580                               USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
 581                               0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
 582         if (err != sizeof(max_datagram_size)) {
 583                 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
 584                 goto out;
 585         }
 586 
 587         if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
 588                 goto out;
 589 
 590         max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
 591         err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
 592                                USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
 593                                0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
 594         if (err < 0)
 595                 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
 596 
 597 out:
 598         /* set MTU to max supported by the device if necessary */
 599         dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
 600 
 601         /* do not exceed operater preferred MTU */
 602         if (ctx->mbim_extended_desc) {
 603                 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
 604                 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
 605                         dev->net->mtu = mbim_mtu;
 606         }
 607 }
 608 
 609 static void cdc_ncm_fix_modulus(struct usbnet *dev)
 610 {
 611         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 612         u32 val;
 613 
 614         /*
 615          * verify that the structure alignment is:
 616          * - power of two
 617          * - not greater than the maximum transmit length
 618          * - not less than four bytes
 619          */
 620         val = ctx->tx_ndp_modulus;
 621 
 622         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 623             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 624                 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
 625                 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 626         }
 627 
 628         /*
 629          * verify that the payload alignment is:
 630          * - power of two
 631          * - not greater than the maximum transmit length
 632          * - not less than four bytes
 633          */
 634         val = ctx->tx_modulus;
 635 
 636         if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
 637             (val != ((-val) & val)) || (val >= ctx->tx_max)) {
 638                 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
 639                 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
 640         }
 641 
 642         /* verify the payload remainder */
 643         if (ctx->tx_remainder >= ctx->tx_modulus) {
 644                 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
 645                 ctx->tx_remainder = 0;
 646         }
 647 
 648         /* adjust TX-remainder according to NCM specification. */
 649         ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
 650                              (ctx->tx_modulus - 1));
 651 }
 652 
 653 static int cdc_ncm_setup(struct usbnet *dev)
 654 {
 655         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 656         u32 def_rx, def_tx;
 657 
 658         /* be conservative when selecting intial buffer size to
 659          * increase the number of hosts this will work for
 660          */
 661         def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
 662                        le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
 663         def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
 664                        le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
 665 
 666         /* clamp rx_max and tx_max and inform device */
 667         cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
 668 
 669         /* sanitize the modulus and remainder values */
 670         cdc_ncm_fix_modulus(dev);
 671 
 672         /* set max datagram size */
 673         cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
 674         return 0;
 675 }
 676 
 677 static void
 678 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
 679 {
 680         struct usb_host_endpoint *e, *in = NULL, *out = NULL;
 681         u8 ep;
 682 
 683         for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
 684                 e = intf->cur_altsetting->endpoint + ep;
 685 
 686                 /* ignore endpoints which cannot transfer data */
 687                 if (!usb_endpoint_maxp(&e->desc))
 688                         continue;
 689 
 690                 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 691                 case USB_ENDPOINT_XFER_INT:
 692                         if (usb_endpoint_dir_in(&e->desc)) {
 693                                 if (!dev->status)
 694                                         dev->status = e;
 695                         }
 696                         break;
 697 
 698                 case USB_ENDPOINT_XFER_BULK:
 699                         if (usb_endpoint_dir_in(&e->desc)) {
 700                                 if (!in)
 701                                         in = e;
 702                         } else {
 703                                 if (!out)
 704                                         out = e;
 705                         }
 706                         break;
 707 
 708                 default:
 709                         break;
 710                 }
 711         }
 712         if (in && !dev->in)
 713                 dev->in = usb_rcvbulkpipe(dev->udev,
 714                                           in->desc.bEndpointAddress &
 715                                           USB_ENDPOINT_NUMBER_MASK);
 716         if (out && !dev->out)
 717                 dev->out = usb_sndbulkpipe(dev->udev,
 718                                            out->desc.bEndpointAddress &
 719                                            USB_ENDPOINT_NUMBER_MASK);
 720 }
 721 
 722 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
 723 {
 724         if (ctx == NULL)
 725                 return;
 726 
 727         if (ctx->tx_rem_skb != NULL) {
 728                 dev_kfree_skb_any(ctx->tx_rem_skb);
 729                 ctx->tx_rem_skb = NULL;
 730         }
 731 
 732         if (ctx->tx_curr_skb != NULL) {
 733                 dev_kfree_skb_any(ctx->tx_curr_skb);
 734                 ctx->tx_curr_skb = NULL;
 735         }
 736 
 737         kfree(ctx->delayed_ndp16);
 738 
 739         kfree(ctx);
 740 }
 741 
 742 /* we need to override the usbnet change_mtu ndo for two reasons:
 743  *  - respect the negotiated maximum datagram size
 744  *  - avoid unwanted changes to rx and tx buffers
 745  */
 746 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
 747 {
 748         struct usbnet *dev = netdev_priv(net);
 749 
 750         net->mtu = new_mtu;
 751         cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
 752 
 753         return 0;
 754 }
 755 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
 756 
 757 static const struct net_device_ops cdc_ncm_netdev_ops = {
 758         .ndo_open            = usbnet_open,
 759         .ndo_stop            = usbnet_stop,
 760         .ndo_start_xmit      = usbnet_start_xmit,
 761         .ndo_tx_timeout      = usbnet_tx_timeout,
 762         .ndo_get_stats64     = usbnet_get_stats64,
 763         .ndo_change_mtu      = cdc_ncm_change_mtu,
 764         .ndo_set_mac_address = eth_mac_addr,
 765         .ndo_validate_addr   = eth_validate_addr,
 766 };
 767 
 768 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
 769 {
 770         struct cdc_ncm_ctx *ctx;
 771         struct usb_driver *driver;
 772         u8 *buf;
 773         int len;
 774         int temp;
 775         int err;
 776         u8 iface_no;
 777         struct usb_cdc_parsed_header hdr;
 778         __le16 curr_ntb_format;
 779 
 780         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 781         if (!ctx)
 782                 return -ENOMEM;
 783 
 784         hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 785         ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
 786         tasklet_init(&ctx->bh, cdc_ncm_txpath_bh, (unsigned long)dev);
 787         atomic_set(&ctx->stop, 0);
 788         spin_lock_init(&ctx->mtx);
 789 
 790         /* store ctx pointer in device data field */
 791         dev->data[0] = (unsigned long)ctx;
 792 
 793         /* only the control interface can be successfully probed */
 794         ctx->control = intf;
 795 
 796         /* get some pointers */
 797         driver = driver_of(intf);
 798         buf = intf->cur_altsetting->extra;
 799         len = intf->cur_altsetting->extralen;
 800 
 801         /* parse through descriptors associated with control interface */
 802         cdc_parse_cdc_header(&hdr, intf, buf, len);
 803 
 804         if (hdr.usb_cdc_union_desc)
 805                 ctx->data = usb_ifnum_to_if(dev->udev,
 806                                             hdr.usb_cdc_union_desc->bSlaveInterface0);
 807         ctx->ether_desc = hdr.usb_cdc_ether_desc;
 808         ctx->func_desc = hdr.usb_cdc_ncm_desc;
 809         ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
 810         ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
 811 
 812         /* some buggy devices have an IAD but no CDC Union */
 813         if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
 814                 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
 815                 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
 816         }
 817 
 818         /* check if we got everything */
 819         if (!ctx->data) {
 820                 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
 821                 goto error;
 822         }
 823         if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
 824                 if (!ctx->mbim_desc) {
 825                         dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
 826                         goto error;
 827                 }
 828         } else {
 829                 if (!ctx->ether_desc || !ctx->func_desc) {
 830                         dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
 831                         goto error;
 832                 }
 833         }
 834 
 835         /* claim data interface, if different from control */
 836         if (ctx->data != ctx->control) {
 837                 temp = usb_driver_claim_interface(driver, ctx->data, dev);
 838                 if (temp) {
 839                         dev_dbg(&intf->dev, "failed to claim data intf\n");
 840                         goto error;
 841                 }
 842         }
 843 
 844         iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
 845 
 846         /* Device-specific flags */
 847         ctx->drvflags = drvflags;
 848 
 849         /* Reset data interface. Some devices will not reset properly
 850          * unless they are configured first.  Toggle the altsetting to
 851          * force a reset.
 852          * Some other devices do not work properly with this procedure
 853          * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
 854          */
 855         if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
 856                 usb_set_interface(dev->udev, iface_no, data_altsetting);
 857 
 858         temp = usb_set_interface(dev->udev, iface_no, 0);
 859         if (temp) {
 860                 dev_dbg(&intf->dev, "set interface failed\n");
 861                 goto error2;
 862         }
 863 
 864         /* initialize basic device settings */
 865         if (cdc_ncm_init(dev))
 866                 goto error2;
 867 
 868         /* Some firmwares need a pause here or they will silently fail
 869          * to set up the interface properly.  This value was decided
 870          * empirically on a Sierra Wireless MC7455 running 02.08.02.00
 871          * firmware.
 872          */
 873         usleep_range(10000, 20000);
 874 
 875         /* configure data interface */
 876         temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
 877         if (temp) {
 878                 dev_dbg(&intf->dev, "set interface failed\n");
 879                 goto error2;
 880         }
 881 
 882         /*
 883          * Some Huawei devices have been observed to come out of reset in NDP32 mode.
 884          * Let's check if this is the case, and set the device to NDP16 mode again if
 885          * needed.
 886         */
 887         if (ctx->drvflags & CDC_NCM_FLAG_RESET_NTB16) {
 888                 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_FORMAT,
 889                                       USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
 890                                       0, iface_no, &curr_ntb_format, 2);
 891                 if (err < 0) {
 892                         goto error2;
 893                 }
 894 
 895                 if (curr_ntb_format == cpu_to_le16(USB_CDC_NCM_NTB32_FORMAT)) {
 896                         dev_info(&intf->dev, "resetting NTB format to 16-bit");
 897                         err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
 898                                                USB_TYPE_CLASS | USB_DIR_OUT
 899                                                | USB_RECIP_INTERFACE,
 900                                                USB_CDC_NCM_NTB16_FORMAT,
 901                                                iface_no, NULL, 0);
 902 
 903                         if (err < 0)
 904                                 goto error2;
 905                 }
 906         }
 907 
 908         cdc_ncm_find_endpoints(dev, ctx->data);
 909         cdc_ncm_find_endpoints(dev, ctx->control);
 910         if (!dev->in || !dev->out || !dev->status) {
 911                 dev_dbg(&intf->dev, "failed to collect endpoints\n");
 912                 goto error2;
 913         }
 914 
 915         usb_set_intfdata(ctx->data, dev);
 916         usb_set_intfdata(ctx->control, dev);
 917 
 918         if (ctx->ether_desc) {
 919                 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
 920                 if (temp) {
 921                         dev_dbg(&intf->dev, "failed to get mac address\n");
 922                         goto error2;
 923                 }
 924                 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
 925         }
 926 
 927         /* finish setting up the device specific data */
 928         cdc_ncm_setup(dev);
 929 
 930         /* Allocate the delayed NDP if needed. */
 931         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
 932                 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
 933                 if (!ctx->delayed_ndp16)
 934                         goto error2;
 935                 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
 936         }
 937 
 938         /* override ethtool_ops */
 939         dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
 940 
 941         /* add our sysfs attrs */
 942         dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
 943 
 944         /* must handle MTU changes */
 945         dev->net->netdev_ops = &cdc_ncm_netdev_ops;
 946         dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
 947 
 948         return 0;
 949 
 950 error2:
 951         usb_set_intfdata(ctx->control, NULL);
 952         usb_set_intfdata(ctx->data, NULL);
 953         if (ctx->data != ctx->control)
 954                 usb_driver_release_interface(driver, ctx->data);
 955 error:
 956         cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
 957         dev->data[0] = 0;
 958         dev_info(&intf->dev, "bind() failure\n");
 959         return -ENODEV;
 960 }
 961 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
 962 
 963 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
 964 {
 965         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
 966         struct usb_driver *driver = driver_of(intf);
 967 
 968         if (ctx == NULL)
 969                 return;         /* no setup */
 970 
 971         atomic_set(&ctx->stop, 1);
 972 
 973         hrtimer_cancel(&ctx->tx_timer);
 974 
 975         tasklet_kill(&ctx->bh);
 976 
 977         /* handle devices with combined control and data interface */
 978         if (ctx->control == ctx->data)
 979                 ctx->data = NULL;
 980 
 981         /* disconnect master --> disconnect slave */
 982         if (intf == ctx->control && ctx->data) {
 983                 usb_set_intfdata(ctx->data, NULL);
 984                 usb_driver_release_interface(driver, ctx->data);
 985                 ctx->data = NULL;
 986 
 987         } else if (intf == ctx->data && ctx->control) {
 988                 usb_set_intfdata(ctx->control, NULL);
 989                 usb_driver_release_interface(driver, ctx->control);
 990                 ctx->control = NULL;
 991         }
 992 
 993         usb_set_intfdata(intf, NULL);
 994         cdc_ncm_free(ctx);
 995 }
 996 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
 997 
 998 /* Return the number of the MBIM control interface altsetting iff it
 999  * is preferred and available,
1000  */
1001 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1002 {
1003         struct usb_host_interface *alt;
1004 
1005         /* The MBIM spec defines a NCM compatible default altsetting,
1006          * which we may have matched:
1007          *
1008          *  "Functions that implement both NCM 1.0 and MBIM (an
1009          *   “NCM/MBIM function”) according to this recommendation
1010          *   shall provide two alternate settings for the
1011          *   Communication Interface.  Alternate setting 0, and the
1012          *   associated class and endpoint descriptors, shall be
1013          *   constructed according to the rules given for the
1014          *   Communication Interface in section 5 of [USBNCM10].
1015          *   Alternate setting 1, and the associated class and
1016          *   endpoint descriptors, shall be constructed according to
1017          *   the rules given in section 6 (USB Device Model) of this
1018          *   specification."
1019          */
1020         if (intf->num_altsetting < 2)
1021                 return intf->cur_altsetting->desc.bAlternateSetting;
1022 
1023         if (prefer_mbim) {
1024                 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1025                 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1026                         return CDC_NCM_COMM_ALTSETTING_MBIM;
1027         }
1028         return CDC_NCM_COMM_ALTSETTING_NCM;
1029 }
1030 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1031 
1032 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1033 {
1034         /* MBIM backwards compatible function? */
1035         if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1036                 return -ENODEV;
1037 
1038         /* The NCM data altsetting is fixed, so we hard-coded it.
1039          * Additionally, generic NCM devices are assumed to accept arbitrarily
1040          * placed NDP.
1041          */
1042         return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1043 }
1044 
1045 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1046 {
1047         size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1048 
1049         if (skb->len + align > max)
1050                 align = max - skb->len;
1051         if (align && skb_tailroom(skb) >= align)
1052                 skb_put_zero(skb, align);
1053 }
1054 
1055 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1056  * allocating a new one within skb
1057  */
1058 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1059 {
1060         struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1061         struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1062         size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1063 
1064         /* If NDP should be moved to the end of the NCM package, we can't follow the
1065         * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1066         * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1067         */
1068         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1069                 if (ctx->delayed_ndp16->dwSignature == sign)
1070                         return ctx->delayed_ndp16;
1071 
1072                 /* We can only push a single NDP to the end. Return
1073                  * NULL to send what we've already got and queue this
1074                  * skb for later.
1075                  */
1076                 else if (ctx->delayed_ndp16->dwSignature)
1077                         return NULL;
1078         }
1079 
1080         /* follow the chain of NDPs, looking for a match */
1081         while (ndpoffset) {
1082                 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1083                 if  (ndp16->dwSignature == sign)
1084                         return ndp16;
1085                 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1086         }
1087 
1088         /* align new NDP */
1089         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1090                 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1091 
1092         /* verify that there is room for the NDP and the datagram (reserve) */
1093         if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1094                 return NULL;
1095 
1096         /* link to it */
1097         if (ndp16)
1098                 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1099         else
1100                 nth16->wNdpIndex = cpu_to_le16(skb->len);
1101 
1102         /* push a new empty NDP */
1103         if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1104                 ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1105         else
1106                 ndp16 = ctx->delayed_ndp16;
1107 
1108         ndp16->dwSignature = sign;
1109         ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1110         return ndp16;
1111 }
1112 
1113 struct sk_buff *
1114 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1115 {
1116         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1117         struct usb_cdc_ncm_nth16 *nth16;
1118         struct usb_cdc_ncm_ndp16 *ndp16;
1119         struct sk_buff *skb_out;
1120         u16 n = 0, index, ndplen;
1121         u8 ready2send = 0;
1122         u32 delayed_ndp_size;
1123         size_t padding_count;
1124 
1125         /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1126          * accordingly. Otherwise, we should check here.
1127          */
1128         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1129                 delayed_ndp_size = ALIGN(ctx->max_ndp_size, ctx->tx_ndp_modulus);
1130         else
1131                 delayed_ndp_size = 0;
1132 
1133         /* if there is a remaining skb, it gets priority */
1134         if (skb != NULL) {
1135                 swap(skb, ctx->tx_rem_skb);
1136                 swap(sign, ctx->tx_rem_sign);
1137         } else {
1138                 ready2send = 1;
1139         }
1140 
1141         /* check if we are resuming an OUT skb */
1142         skb_out = ctx->tx_curr_skb;
1143 
1144         /* allocate a new OUT skb */
1145         if (!skb_out) {
1146                 if (ctx->tx_low_mem_val == 0) {
1147                         ctx->tx_curr_size = ctx->tx_max;
1148                         skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1149                         /* If the memory allocation fails we will wait longer
1150                          * each time before attempting another full size
1151                          * allocation again to not overload the system
1152                          * further.
1153                          */
1154                         if (skb_out == NULL) {
1155                                 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1156                                                               (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1157                                 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1158                         }
1159                 }
1160                 if (skb_out == NULL) {
1161                         /* See if a very small allocation is possible.
1162                          * We will send this packet immediately and hope
1163                          * that there is more memory available later.
1164                          */
1165                         if (skb)
1166                                 ctx->tx_curr_size = max(skb->len,
1167                                         (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1168                         else
1169                                 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1170                         skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1171 
1172                         /* No allocation possible so we will abort */
1173                         if (skb_out == NULL) {
1174                                 if (skb != NULL) {
1175                                         dev_kfree_skb_any(skb);
1176                                         dev->net->stats.tx_dropped++;
1177                                 }
1178                                 goto exit_no_skb;
1179                         }
1180                         ctx->tx_low_mem_val--;
1181                 }
1182                 /* fill out the initial 16-bit NTB header */
1183                 nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1184                 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1185                 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1186                 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1187 
1188                 /* count total number of frames in this NTB */
1189                 ctx->tx_curr_frame_num = 0;
1190 
1191                 /* recent payload counter for this skb_out */
1192                 ctx->tx_curr_frame_payload = 0;
1193         }
1194 
1195         for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1196                 /* send any remaining skb first */
1197                 if (skb == NULL) {
1198                         skb = ctx->tx_rem_skb;
1199                         sign = ctx->tx_rem_sign;
1200                         ctx->tx_rem_skb = NULL;
1201 
1202                         /* check for end of skb */
1203                         if (skb == NULL)
1204                                 break;
1205                 }
1206 
1207                 /* get the appropriate NDP for this skb */
1208                 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1209 
1210                 /* align beginning of next frame */
1211                 cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1212 
1213                 /* check if we had enough room left for both NDP and frame */
1214                 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1215                         if (n == 0) {
1216                                 /* won't fit, MTU problem? */
1217                                 dev_kfree_skb_any(skb);
1218                                 skb = NULL;
1219                                 dev->net->stats.tx_dropped++;
1220                         } else {
1221                                 /* no room for skb - store for later */
1222                                 if (ctx->tx_rem_skb != NULL) {
1223                                         dev_kfree_skb_any(ctx->tx_rem_skb);
1224                                         dev->net->stats.tx_dropped++;
1225                                 }
1226                                 ctx->tx_rem_skb = skb;
1227                                 ctx->tx_rem_sign = sign;
1228                                 skb = NULL;
1229                                 ready2send = 1;
1230                                 ctx->tx_reason_ntb_full++;      /* count reason for transmitting */
1231                         }
1232                         break;
1233                 }
1234 
1235                 /* calculate frame number withing this NDP */
1236                 ndplen = le16_to_cpu(ndp16->wLength);
1237                 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1238 
1239                 /* OK, add this skb */
1240                 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1241                 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1242                 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1243                 skb_put_data(skb_out, skb->data, skb->len);
1244                 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1245                 dev_kfree_skb_any(skb);
1246                 skb = NULL;
1247 
1248                 /* send now if this NDP is full */
1249                 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1250                         ready2send = 1;
1251                         ctx->tx_reason_ndp_full++;      /* count reason for transmitting */
1252                         break;
1253                 }
1254         }
1255 
1256         /* free up any dangling skb */
1257         if (skb != NULL) {
1258                 dev_kfree_skb_any(skb);
1259                 skb = NULL;
1260                 dev->net->stats.tx_dropped++;
1261         }
1262 
1263         ctx->tx_curr_frame_num = n;
1264 
1265         if (n == 0) {
1266                 /* wait for more frames */
1267                 /* push variables */
1268                 ctx->tx_curr_skb = skb_out;
1269                 goto exit_no_skb;
1270 
1271         } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1272                 /* wait for more frames */
1273                 /* push variables */
1274                 ctx->tx_curr_skb = skb_out;
1275                 /* set the pending count */
1276                 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1277                         ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1278                 goto exit_no_skb;
1279 
1280         } else {
1281                 if (n == ctx->tx_max_datagrams)
1282                         ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1283                 /* frame goes out */
1284                 /* variables will be reset at next call */
1285         }
1286 
1287         /* If requested, put NDP at end of frame. */
1288         if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1289                 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1290                 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1291                 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1292                 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1293 
1294                 /* Zero out delayed NDP - signature checking will naturally fail. */
1295                 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1296         }
1297 
1298         /* If collected data size is less or equal ctx->min_tx_pkt
1299          * bytes, we send buffers as it is. If we get more data, it
1300          * would be more efficient for USB HS mobile device with DMA
1301          * engine to receive a full size NTB, than canceling DMA
1302          * transfer and receiving a short packet.
1303          *
1304          * This optimization support is pointless if we end up sending
1305          * a ZLP after full sized NTBs.
1306          */
1307         if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1308             skb_out->len > ctx->min_tx_pkt) {
1309                 padding_count = ctx->tx_curr_size - skb_out->len;
1310                 skb_put_zero(skb_out, padding_count);
1311         } else if (skb_out->len < ctx->tx_curr_size &&
1312                    (skb_out->len % dev->maxpacket) == 0) {
1313                 skb_put_u8(skb_out, 0); /* force short packet */
1314         }
1315 
1316         /* set final frame length */
1317         nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1318         nth16->wBlockLength = cpu_to_le16(skb_out->len);
1319 
1320         /* return skb */
1321         ctx->tx_curr_skb = NULL;
1322 
1323         /* keep private stats: framing overhead and number of NTBs */
1324         ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1325         ctx->tx_ntbs++;
1326 
1327         /* usbnet will count all the framing overhead by default.
1328          * Adjust the stats so that the tx_bytes counter show real
1329          * payload data instead.
1330          */
1331         usbnet_set_skb_tx_stats(skb_out, n,
1332                                 (long)ctx->tx_curr_frame_payload - skb_out->len);
1333 
1334         return skb_out;
1335 
1336 exit_no_skb:
1337         /* Start timer, if there is a remaining non-empty skb */
1338         if (ctx->tx_curr_skb != NULL && n > 0)
1339                 cdc_ncm_tx_timeout_start(ctx);
1340         return NULL;
1341 }
1342 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1343 
1344 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1345 {
1346         /* start timer, if not already started */
1347         if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1348                 hrtimer_start(&ctx->tx_timer,
1349                                 ctx->timer_interval,
1350                                 HRTIMER_MODE_REL);
1351 }
1352 
1353 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1354 {
1355         struct cdc_ncm_ctx *ctx =
1356                         container_of(timer, struct cdc_ncm_ctx, tx_timer);
1357 
1358         if (!atomic_read(&ctx->stop))
1359                 tasklet_schedule(&ctx->bh);
1360         return HRTIMER_NORESTART;
1361 }
1362 
1363 static void cdc_ncm_txpath_bh(unsigned long param)
1364 {
1365         struct usbnet *dev = (struct usbnet *)param;
1366         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1367 
1368         spin_lock_bh(&ctx->mtx);
1369         if (ctx->tx_timer_pending != 0) {
1370                 ctx->tx_timer_pending--;
1371                 cdc_ncm_tx_timeout_start(ctx);
1372                 spin_unlock_bh(&ctx->mtx);
1373         } else if (dev->net != NULL) {
1374                 ctx->tx_reason_timeout++;       /* count reason for transmitting */
1375                 spin_unlock_bh(&ctx->mtx);
1376                 netif_tx_lock_bh(dev->net);
1377                 usbnet_start_xmit(NULL, dev->net);
1378                 netif_tx_unlock_bh(dev->net);
1379         } else {
1380                 spin_unlock_bh(&ctx->mtx);
1381         }
1382 }
1383 
1384 struct sk_buff *
1385 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1386 {
1387         struct sk_buff *skb_out;
1388         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1389 
1390         /*
1391          * The Ethernet API we are using does not support transmitting
1392          * multiple Ethernet frames in a single call. This driver will
1393          * accumulate multiple Ethernet frames and send out a larger
1394          * USB frame when the USB buffer is full or when a single jiffies
1395          * timeout happens.
1396          */
1397         if (ctx == NULL)
1398                 goto error;
1399 
1400         spin_lock_bh(&ctx->mtx);
1401         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1402         spin_unlock_bh(&ctx->mtx);
1403         return skb_out;
1404 
1405 error:
1406         if (skb != NULL)
1407                 dev_kfree_skb_any(skb);
1408 
1409         return NULL;
1410 }
1411 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1412 
1413 /* verify NTB header and return offset of first NDP, or negative error */
1414 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1415 {
1416         struct usbnet *dev = netdev_priv(skb_in->dev);
1417         struct usb_cdc_ncm_nth16 *nth16;
1418         int len;
1419         int ret = -EINVAL;
1420 
1421         if (ctx == NULL)
1422                 goto error;
1423 
1424         if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1425                                         sizeof(struct usb_cdc_ncm_ndp16))) {
1426                 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1427                 goto error;
1428         }
1429 
1430         nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1431 
1432         if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1433                 netif_dbg(dev, rx_err, dev->net,
1434                           "invalid NTH16 signature <%#010x>\n",
1435                           le32_to_cpu(nth16->dwSignature));
1436                 goto error;
1437         }
1438 
1439         len = le16_to_cpu(nth16->wBlockLength);
1440         if (len > ctx->rx_max) {
1441                 netif_dbg(dev, rx_err, dev->net,
1442                           "unsupported NTB block length %u/%u\n", len,
1443                           ctx->rx_max);
1444                 goto error;
1445         }
1446 
1447         if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1448             (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1449             !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1450                 netif_dbg(dev, rx_err, dev->net,
1451                           "sequence number glitch prev=%d curr=%d\n",
1452                           ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1453         }
1454         ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1455 
1456         ret = le16_to_cpu(nth16->wNdpIndex);
1457 error:
1458         return ret;
1459 }
1460 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1461 
1462 /* verify NDP header and return number of datagrams, or negative error */
1463 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1464 {
1465         struct usbnet *dev = netdev_priv(skb_in->dev);
1466         struct usb_cdc_ncm_ndp16 *ndp16;
1467         int ret = -EINVAL;
1468 
1469         if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1470                 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1471                           ndpoffset);
1472                 goto error;
1473         }
1474         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1475 
1476         if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1477                 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1478                           le16_to_cpu(ndp16->wLength));
1479                 goto error;
1480         }
1481 
1482         ret = ((le16_to_cpu(ndp16->wLength) -
1483                                         sizeof(struct usb_cdc_ncm_ndp16)) /
1484                                         sizeof(struct usb_cdc_ncm_dpe16));
1485         ret--; /* we process NDP entries except for the last one */
1486 
1487         if ((sizeof(struct usb_cdc_ncm_ndp16) +
1488              ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1489                 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1490                 ret = -EINVAL;
1491         }
1492 
1493 error:
1494         return ret;
1495 }
1496 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1497 
1498 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1499 {
1500         struct sk_buff *skb;
1501         struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1502         int len;
1503         int nframes;
1504         int x;
1505         int offset;
1506         struct usb_cdc_ncm_ndp16 *ndp16;
1507         struct usb_cdc_ncm_dpe16 *dpe16;
1508         int ndpoffset;
1509         int loopcount = 50; /* arbitrary max preventing infinite loop */
1510         u32 payload = 0;
1511 
1512         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1513         if (ndpoffset < 0)
1514                 goto error;
1515 
1516 next_ndp:
1517         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1518         if (nframes < 0)
1519                 goto error;
1520 
1521         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1522 
1523         if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1524                 netif_dbg(dev, rx_err, dev->net,
1525                           "invalid DPT16 signature <%#010x>\n",
1526                           le32_to_cpu(ndp16->dwSignature));
1527                 goto err_ndp;
1528         }
1529         dpe16 = ndp16->dpe16;
1530 
1531         for (x = 0; x < nframes; x++, dpe16++) {
1532                 offset = le16_to_cpu(dpe16->wDatagramIndex);
1533                 len = le16_to_cpu(dpe16->wDatagramLength);
1534 
1535                 /*
1536                  * CDC NCM ch. 3.7
1537                  * All entries after first NULL entry are to be ignored
1538                  */
1539                 if ((offset == 0) || (len == 0)) {
1540                         if (!x)
1541                                 goto err_ndp; /* empty NTB */
1542                         break;
1543                 }
1544 
1545                 /* sanity checking */
1546                 if (((offset + len) > skb_in->len) ||
1547                                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1548                         netif_dbg(dev, rx_err, dev->net,
1549                                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1550                                   x, offset, len, skb_in);
1551                         if (!x)
1552                                 goto err_ndp;
1553                         break;
1554 
1555                 } else {
1556                         /* create a fresh copy to reduce truesize */
1557                         skb = netdev_alloc_skb_ip_align(dev->net,  len);
1558                         if (!skb)
1559                                 goto error;
1560                         skb_put_data(skb, skb_in->data + offset, len);
1561                         usbnet_skb_return(dev, skb);
1562                         payload += len; /* count payload bytes in this NTB */
1563                 }
1564         }
1565 err_ndp:
1566         /* are there more NDPs to process? */
1567         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1568         if (ndpoffset && loopcount--)
1569                 goto next_ndp;
1570 
1571         /* update stats */
1572         ctx->rx_overhead += skb_in->len - payload;
1573         ctx->rx_ntbs++;
1574 
1575         return 1;
1576 error:
1577         return 0;
1578 }
1579 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1580 
1581 static void
1582 cdc_ncm_speed_change(struct usbnet *dev,
1583                      struct usb_cdc_speed_change *data)
1584 {
1585         uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1586         uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1587 
1588         /*
1589          * Currently the USB-NET API does not support reporting the actual
1590          * device speed. Do print it instead.
1591          */
1592         if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1593                 netif_info(dev, link, dev->net,
1594                            "%u mbit/s downlink %u mbit/s uplink\n",
1595                            (unsigned int)(rx_speed / 1000000U),
1596                            (unsigned int)(tx_speed / 1000000U));
1597         } else {
1598                 netif_info(dev, link, dev->net,
1599                            "%u kbit/s downlink %u kbit/s uplink\n",
1600                            (unsigned int)(rx_speed / 1000U),
1601                            (unsigned int)(tx_speed / 1000U));
1602         }
1603 }
1604 
1605 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1606 {
1607         struct usb_cdc_notification *event;
1608 
1609         if (urb->actual_length < sizeof(*event))
1610                 return;
1611 
1612         /* test for split data in 8-byte chunks */
1613         if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1614                 cdc_ncm_speed_change(dev,
1615                       (struct usb_cdc_speed_change *)urb->transfer_buffer);
1616                 return;
1617         }
1618 
1619         event = urb->transfer_buffer;
1620 
1621         switch (event->bNotificationType) {
1622         case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1623                 /*
1624                  * According to the CDC NCM specification ch.7.1
1625                  * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1626                  * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1627                  */
1628                 netif_info(dev, link, dev->net,
1629                            "network connection: %sconnected\n",
1630                            !!event->wValue ? "" : "dis");
1631                 usbnet_link_change(dev, !!event->wValue, 0);
1632                 break;
1633 
1634         case USB_CDC_NOTIFY_SPEED_CHANGE:
1635                 if (urb->actual_length < (sizeof(*event) +
1636                                         sizeof(struct usb_cdc_speed_change)))
1637                         set_bit(EVENT_STS_SPLIT, &dev->flags);
1638                 else
1639                         cdc_ncm_speed_change(dev,
1640                                              (struct usb_cdc_speed_change *)&event[1]);
1641                 break;
1642 
1643         default:
1644                 dev_dbg(&dev->udev->dev,
1645                         "NCM: unexpected notification 0x%02x!\n",
1646                         event->bNotificationType);
1647                 break;
1648         }
1649 }
1650 
1651 static const struct driver_info cdc_ncm_info = {
1652         .description = "CDC NCM",
1653         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1654                         | FLAG_LINK_INTR,
1655         .bind = cdc_ncm_bind,
1656         .unbind = cdc_ncm_unbind,
1657         .manage_power = usbnet_manage_power,
1658         .status = cdc_ncm_status,
1659         .rx_fixup = cdc_ncm_rx_fixup,
1660         .tx_fixup = cdc_ncm_tx_fixup,
1661 };
1662 
1663 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1664 static const struct driver_info wwan_info = {
1665         .description = "Mobile Broadband Network Device",
1666         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1667                         | FLAG_LINK_INTR | FLAG_WWAN,
1668         .bind = cdc_ncm_bind,
1669         .unbind = cdc_ncm_unbind,
1670         .manage_power = usbnet_manage_power,
1671         .status = cdc_ncm_status,
1672         .rx_fixup = cdc_ncm_rx_fixup,
1673         .tx_fixup = cdc_ncm_tx_fixup,
1674 };
1675 
1676 /* Same as wwan_info, but with FLAG_NOARP  */
1677 static const struct driver_info wwan_noarp_info = {
1678         .description = "Mobile Broadband Network Device (NO ARP)",
1679         .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1680                         | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1681         .bind = cdc_ncm_bind,
1682         .unbind = cdc_ncm_unbind,
1683         .manage_power = usbnet_manage_power,
1684         .status = cdc_ncm_status,
1685         .rx_fixup = cdc_ncm_rx_fixup,
1686         .tx_fixup = cdc_ncm_tx_fixup,
1687 };
1688 
1689 static const struct usb_device_id cdc_devs[] = {
1690         /* Ericsson MBM devices like F5521gw */
1691         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1692                 | USB_DEVICE_ID_MATCH_VENDOR,
1693           .idVendor = 0x0bdb,
1694           .bInterfaceClass = USB_CLASS_COMM,
1695           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1696           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1697           .driver_info = (unsigned long) &wwan_info,
1698         },
1699 
1700         /* Telit LE910 V2 */
1701         { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1702                 USB_CLASS_COMM,
1703                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1704           .driver_info = (unsigned long)&wwan_noarp_info,
1705         },
1706 
1707         /* DW5812 LTE Verizon Mobile Broadband Card
1708          * Unlike DW5550 this device requires FLAG_NOARP
1709          */
1710         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1711                 USB_CLASS_COMM,
1712                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1713           .driver_info = (unsigned long)&wwan_noarp_info,
1714         },
1715 
1716         /* DW5813 LTE AT&T Mobile Broadband Card
1717          * Unlike DW5550 this device requires FLAG_NOARP
1718          */
1719         { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1720                 USB_CLASS_COMM,
1721                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1722           .driver_info = (unsigned long)&wwan_noarp_info,
1723         },
1724 
1725         /* Dell branded MBM devices like DW5550 */
1726         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1727                 | USB_DEVICE_ID_MATCH_VENDOR,
1728           .idVendor = 0x413c,
1729           .bInterfaceClass = USB_CLASS_COMM,
1730           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1731           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1732           .driver_info = (unsigned long) &wwan_info,
1733         },
1734 
1735         /* Toshiba branded MBM devices */
1736         { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1737                 | USB_DEVICE_ID_MATCH_VENDOR,
1738           .idVendor = 0x0930,
1739           .bInterfaceClass = USB_CLASS_COMM,
1740           .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1741           .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1742           .driver_info = (unsigned long) &wwan_info,
1743         },
1744 
1745         /* tag Huawei devices as wwan */
1746         { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1747                                         USB_CLASS_COMM,
1748                                         USB_CDC_SUBCLASS_NCM,
1749                                         USB_CDC_PROTO_NONE),
1750           .driver_info = (unsigned long)&wwan_info,
1751         },
1752 
1753         /* Infineon(now Intel) HSPA Modem platform */
1754         { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1755                 USB_CLASS_COMM,
1756                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1757           .driver_info = (unsigned long)&wwan_noarp_info,
1758         },
1759 
1760         /* u-blox TOBY-L4 */
1761         { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
1762                 USB_CLASS_COMM,
1763                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1764           .driver_info = (unsigned long)&wwan_info,
1765         },
1766 
1767         /* Generic CDC-NCM devices */
1768         { USB_INTERFACE_INFO(USB_CLASS_COMM,
1769                 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1770                 .driver_info = (unsigned long)&cdc_ncm_info,
1771         },
1772         {
1773         },
1774 };
1775 MODULE_DEVICE_TABLE(usb, cdc_devs);
1776 
1777 static struct usb_driver cdc_ncm_driver = {
1778         .name = "cdc_ncm",
1779         .id_table = cdc_devs,
1780         .probe = usbnet_probe,
1781         .disconnect = usbnet_disconnect,
1782         .suspend = usbnet_suspend,
1783         .resume = usbnet_resume,
1784         .reset_resume = usbnet_resume,
1785         .supports_autosuspend = 1,
1786         .disable_hub_initiated_lpm = 1,
1787 };
1788 
1789 module_usb_driver(cdc_ncm_driver);
1790 
1791 MODULE_AUTHOR("Hans Petter Selasky");
1792 MODULE_DESCRIPTION("USB CDC NCM host driver");
1793 MODULE_LICENSE("Dual BSD/GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/usb/cdc_ncm.c

DEFINITIONS
