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0001 /*
0002  * cdc_ncm.c
0003  *
0004  * Copyright (C) ST-Ericsson 2010-2012
0005  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
0006  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
0007  *
0008  * USB Host Driver for Network Control Model (NCM)
0009  * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
0010  *
0011  * The NCM encoding, decoding and initialization logic
0012  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
0013  *
0014  * This software is available to you under a choice of one of two
0015  * licenses. You may choose this file to be licensed under the terms
0016  * of the GNU General Public License (GPL) Version 2 or the 2-clause
0017  * BSD license listed below:
0018  *
0019  * Redistribution and use in source and binary forms, with or without
0020  * modification, are permitted provided that the following conditions
0021  * are met:
0022  * 1. Redistributions of source code must retain the above copyright
0023  *    notice, this list of conditions and the following disclaimer.
0024  * 2. Redistributions in binary form must reproduce the above copyright
0025  *    notice, this list of conditions and the following disclaimer in the
0026  *    documentation and/or other materials provided with the distribution.
0027  *
0028  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
0029  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0030  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0031  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
0032  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
0033  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
0034  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0035  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
0036  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
0037  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
0038  * SUCH DAMAGE.
0039  */
0040 
0041 #include <linux/module.h>
0042 #include <linux/netdevice.h>
0043 #include <linux/ctype.h>
0044 #include <linux/etherdevice.h>
0045 #include <linux/ethtool.h>
0046 #include <linux/workqueue.h>
0047 #include <linux/mii.h>
0048 #include <linux/crc32.h>
0049 #include <linux/usb.h>
0050 #include <linux/hrtimer.h>
0051 #include <linux/atomic.h>
0052 #include <linux/usb/usbnet.h>
0053 #include <linux/usb/cdc.h>
0054 #include <linux/usb/cdc_ncm.h>
0055 
0056 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
0057 static bool prefer_mbim = true;
0058 #else
0059 static bool prefer_mbim;
0060 #endif
0061 module_param(prefer_mbim, bool, 0644);
0062 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
0063 
0064 static void cdc_ncm_txpath_bh(struct tasklet_struct *t);
0065 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
0066 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
0067 static struct usb_driver cdc_ncm_driver;
0068 
0069 struct cdc_ncm_stats {
0070     char stat_string[ETH_GSTRING_LEN];
0071     int sizeof_stat;
0072     int stat_offset;
0073 };
0074 
0075 #define CDC_NCM_STAT(str, m) { \
0076         .stat_string = str, \
0077         .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
0078         .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
0079 #define CDC_NCM_SIMPLE_STAT(m)  CDC_NCM_STAT(__stringify(m), m)
0080 
0081 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
0082     CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
0083     CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
0084     CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
0085     CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
0086     CDC_NCM_SIMPLE_STAT(tx_overhead),
0087     CDC_NCM_SIMPLE_STAT(tx_ntbs),
0088     CDC_NCM_SIMPLE_STAT(rx_overhead),
0089     CDC_NCM_SIMPLE_STAT(rx_ntbs),
0090 };
0091 
0092 #define CDC_NCM_LOW_MEM_MAX_CNT 10
0093 
0094 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
0095 {
0096     switch (sset) {
0097     case ETH_SS_STATS:
0098         return ARRAY_SIZE(cdc_ncm_gstrings_stats);
0099     default:
0100         return -EOPNOTSUPP;
0101     }
0102 }
0103 
0104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
0105                     struct ethtool_stats __always_unused *stats,
0106                     u64 *data)
0107 {
0108     struct usbnet *dev = netdev_priv(netdev);
0109     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0110     int i;
0111     char *p = NULL;
0112 
0113     for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
0114         p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
0115         data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
0116     }
0117 }
0118 
0119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
0120 {
0121     u8 *p = data;
0122     int i;
0123 
0124     switch (stringset) {
0125     case ETH_SS_STATS:
0126         for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
0127             memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
0128             p += ETH_GSTRING_LEN;
0129         }
0130     }
0131 }
0132 
0133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
0134 
0135 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
0136     .get_link       = usbnet_get_link,
0137     .nway_reset     = usbnet_nway_reset,
0138     .get_drvinfo        = usbnet_get_drvinfo,
0139     .get_msglevel       = usbnet_get_msglevel,
0140     .set_msglevel       = usbnet_set_msglevel,
0141     .get_ts_info        = ethtool_op_get_ts_info,
0142     .get_sset_count     = cdc_ncm_get_sset_count,
0143     .get_strings        = cdc_ncm_get_strings,
0144     .get_ethtool_stats  = cdc_ncm_get_ethtool_stats,
0145     .get_link_ksettings = usbnet_get_link_ksettings_internal,
0146     .set_link_ksettings = NULL,
0147 };
0148 
0149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
0150 {
0151     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0152     u32 val, max, min;
0153 
0154     /* clamp new_rx to sane values */
0155     min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
0156     max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
0157 
0158     /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
0159     if (max < min) {
0160         dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
0161              le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
0162         max = min;
0163     }
0164 
0165     val = clamp_t(u32, new_rx, min, max);
0166     if (val != new_rx)
0167         dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
0168 
0169     return val;
0170 }
0171 
0172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
0173 {
0174     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0175     u32 val, max, min;
0176 
0177     /* clamp new_tx to sane values */
0178     if (ctx->is_ndp16)
0179         min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
0180     else
0181         min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth32);
0182 
0183     max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
0184     if (max == 0)
0185         max = CDC_NCM_NTB_MAX_SIZE_TX; /* dwNtbOutMaxSize not set */
0186 
0187     /* some devices set dwNtbOutMaxSize too low for the above default */
0188     min = min(min, max);
0189 
0190     val = clamp_t(u32, new_tx, min, max);
0191     if (val != new_tx)
0192         dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
0193 
0194     return val;
0195 }
0196 
0197 static ssize_t min_tx_pkt_show(struct device *d,
0198                    struct device_attribute *attr, char *buf)
0199 {
0200     struct usbnet *dev = netdev_priv(to_net_dev(d));
0201     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0202 
0203     return sprintf(buf, "%u\n", ctx->min_tx_pkt);
0204 }
0205 
0206 static ssize_t rx_max_show(struct device *d,
0207                struct device_attribute *attr, char *buf)
0208 {
0209     struct usbnet *dev = netdev_priv(to_net_dev(d));
0210     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0211 
0212     return sprintf(buf, "%u\n", ctx->rx_max);
0213 }
0214 
0215 static ssize_t tx_max_show(struct device *d,
0216                struct device_attribute *attr, char *buf)
0217 {
0218     struct usbnet *dev = netdev_priv(to_net_dev(d));
0219     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0220 
0221     return sprintf(buf, "%u\n", ctx->tx_max);
0222 }
0223 
0224 static ssize_t tx_timer_usecs_show(struct device *d,
0225                    struct device_attribute *attr, char *buf)
0226 {
0227     struct usbnet *dev = netdev_priv(to_net_dev(d));
0228     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0229 
0230     return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
0231 }
0232 
0233 static ssize_t min_tx_pkt_store(struct device *d,
0234                 struct device_attribute *attr,
0235                 const char *buf, size_t len)
0236 {
0237     struct usbnet *dev = netdev_priv(to_net_dev(d));
0238     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0239     unsigned long val;
0240 
0241     /* no need to restrict values - anything from 0 to infinity is OK */
0242     if (kstrtoul(buf, 0, &val))
0243         return -EINVAL;
0244 
0245     ctx->min_tx_pkt = val;
0246     return len;
0247 }
0248 
0249 static ssize_t rx_max_store(struct device *d,
0250                 struct device_attribute *attr,
0251                 const char *buf, size_t len)
0252 {
0253     struct usbnet *dev = netdev_priv(to_net_dev(d));
0254     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0255     unsigned long val;
0256 
0257     if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
0258         return -EINVAL;
0259 
0260     cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
0261     return len;
0262 }
0263 
0264 static ssize_t tx_max_store(struct device *d,
0265                 struct device_attribute *attr,
0266                 const char *buf, size_t len)
0267 {
0268     struct usbnet *dev = netdev_priv(to_net_dev(d));
0269     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0270     unsigned long val;
0271 
0272     if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
0273         return -EINVAL;
0274 
0275     cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
0276     return len;
0277 }
0278 
0279 static ssize_t tx_timer_usecs_store(struct device *d,
0280                     struct device_attribute *attr,
0281                     const char *buf, size_t len)
0282 {
0283     struct usbnet *dev = netdev_priv(to_net_dev(d));
0284     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0285     ssize_t ret;
0286     unsigned long val;
0287 
0288     ret = kstrtoul(buf, 0, &val);
0289     if (ret)
0290         return ret;
0291     if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
0292         return -EINVAL;
0293 
0294     spin_lock_bh(&ctx->mtx);
0295     ctx->timer_interval = val * NSEC_PER_USEC;
0296     if (!ctx->timer_interval)
0297         ctx->tx_timer_pending = 0;
0298     spin_unlock_bh(&ctx->mtx);
0299     return len;
0300 }
0301 
0302 static DEVICE_ATTR_RW(min_tx_pkt);
0303 static DEVICE_ATTR_RW(rx_max);
0304 static DEVICE_ATTR_RW(tx_max);
0305 static DEVICE_ATTR_RW(tx_timer_usecs);
0306 
0307 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
0308 {
0309     struct usbnet *dev = netdev_priv(to_net_dev(d));
0310     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0311 
0312     return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
0313 }
0314 
0315 static ssize_t ndp_to_end_store(struct device *d,  struct device_attribute *attr, const char *buf, size_t len)
0316 {
0317     struct usbnet *dev = netdev_priv(to_net_dev(d));
0318     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0319     bool enable;
0320 
0321     if (strtobool(buf, &enable))
0322         return -EINVAL;
0323 
0324     /* no change? */
0325     if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
0326         return len;
0327 
0328     if (enable) {
0329         if (ctx->is_ndp16 && !ctx->delayed_ndp16) {
0330             ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
0331             if (!ctx->delayed_ndp16)
0332                 return -ENOMEM;
0333         }
0334         if (!ctx->is_ndp16 && !ctx->delayed_ndp32) {
0335             ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
0336             if (!ctx->delayed_ndp32)
0337                 return -ENOMEM;
0338         }
0339     }
0340 
0341     /* flush pending data before changing flag */
0342     netif_tx_lock_bh(dev->net);
0343     usbnet_start_xmit(NULL, dev->net);
0344     spin_lock_bh(&ctx->mtx);
0345     if (enable)
0346         ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
0347     else
0348         ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
0349     spin_unlock_bh(&ctx->mtx);
0350     netif_tx_unlock_bh(dev->net);
0351 
0352     return len;
0353 }
0354 static DEVICE_ATTR_RW(ndp_to_end);
0355 
0356 #define NCM_PARM_ATTR(name, format, tocpu)              \
0357 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
0358 { \
0359     struct usbnet *dev = netdev_priv(to_net_dev(d)); \
0360     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
0361     return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));    \
0362 } \
0363 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
0364 
0365 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
0366 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
0367 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
0368 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
0369 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
0370 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
0371 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
0372 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
0373 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
0374 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
0375 
0376 static struct attribute *cdc_ncm_sysfs_attrs[] = {
0377     &dev_attr_min_tx_pkt.attr,
0378     &dev_attr_ndp_to_end.attr,
0379     &dev_attr_rx_max.attr,
0380     &dev_attr_tx_max.attr,
0381     &dev_attr_tx_timer_usecs.attr,
0382     &dev_attr_bmNtbFormatsSupported.attr,
0383     &dev_attr_dwNtbInMaxSize.attr,
0384     &dev_attr_wNdpInDivisor.attr,
0385     &dev_attr_wNdpInPayloadRemainder.attr,
0386     &dev_attr_wNdpInAlignment.attr,
0387     &dev_attr_dwNtbOutMaxSize.attr,
0388     &dev_attr_wNdpOutDivisor.attr,
0389     &dev_attr_wNdpOutPayloadRemainder.attr,
0390     &dev_attr_wNdpOutAlignment.attr,
0391     &dev_attr_wNtbOutMaxDatagrams.attr,
0392     NULL,
0393 };
0394 
0395 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
0396     .name = "cdc_ncm",
0397     .attrs = cdc_ncm_sysfs_attrs,
0398 };
0399 
0400 /* handle rx_max and tx_max changes */
0401 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
0402 {
0403     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0404     u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
0405     u32 val;
0406 
0407     val = cdc_ncm_check_rx_max(dev, new_rx);
0408 
0409     /* inform device about NTB input size changes */
0410     if (val != ctx->rx_max) {
0411         __le32 dwNtbInMaxSize = cpu_to_le32(val);
0412 
0413         dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
0414 
0415         /* tell device to use new size */
0416         if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
0417                      USB_TYPE_CLASS | USB_DIR_OUT
0418                      | USB_RECIP_INTERFACE,
0419                      0, iface_no, &dwNtbInMaxSize, 4) < 0)
0420             dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
0421         else
0422             ctx->rx_max = val;
0423     }
0424 
0425     /* usbnet use these values for sizing rx queues */
0426     if (dev->rx_urb_size != ctx->rx_max) {
0427         dev->rx_urb_size = ctx->rx_max;
0428         if (netif_running(dev->net))
0429             usbnet_unlink_rx_urbs(dev);
0430     }
0431 
0432     val = cdc_ncm_check_tx_max(dev, new_tx);
0433     if (val != ctx->tx_max)
0434         dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
0435 
0436     /* Adding a pad byte here if necessary simplifies the handling
0437      * in cdc_ncm_fill_tx_frame, making tx_max always represent
0438      * the real skb max size.
0439      *
0440      * We cannot use dev->maxpacket here because this is called from
0441      * .bind which is called before usbnet sets up dev->maxpacket
0442      */
0443     if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
0444         val % usb_maxpacket(dev->udev, dev->out) == 0)
0445         val++;
0446 
0447     /* we might need to flush any pending tx buffers if running */
0448     if (netif_running(dev->net) && val > ctx->tx_max) {
0449         netif_tx_lock_bh(dev->net);
0450         usbnet_start_xmit(NULL, dev->net);
0451         /* make sure tx_curr_skb is reallocated if it was empty */
0452         if (ctx->tx_curr_skb) {
0453             dev_kfree_skb_any(ctx->tx_curr_skb);
0454             ctx->tx_curr_skb = NULL;
0455         }
0456         ctx->tx_max = val;
0457         netif_tx_unlock_bh(dev->net);
0458     } else {
0459         ctx->tx_max = val;
0460     }
0461 
0462     dev->hard_mtu = ctx->tx_max;
0463 
0464     /* max qlen depend on hard_mtu and rx_urb_size */
0465     usbnet_update_max_qlen(dev);
0466 
0467     /* never pad more than 3 full USB packets per transfer */
0468     ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out),
0469                   CDC_NCM_MIN_TX_PKT, ctx->tx_max);
0470 }
0471 
0472 /* helpers for NCM and MBIM differences */
0473 static u8 cdc_ncm_flags(struct usbnet *dev)
0474 {
0475     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0476 
0477     if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
0478         return ctx->mbim_desc->bmNetworkCapabilities;
0479     if (ctx->func_desc)
0480         return ctx->func_desc->bmNetworkCapabilities;
0481     return 0;
0482 }
0483 
0484 static int cdc_ncm_eth_hlen(struct usbnet *dev)
0485 {
0486     if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
0487         return 0;
0488     return ETH_HLEN;
0489 }
0490 
0491 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
0492 {
0493     if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
0494         return CDC_MBIM_MIN_DATAGRAM_SIZE;
0495     return CDC_NCM_MIN_DATAGRAM_SIZE;
0496 }
0497 
0498 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
0499 {
0500     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0501 
0502     if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
0503         return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
0504     if (ctx->ether_desc)
0505         return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
0506     return CDC_NCM_MAX_DATAGRAM_SIZE;
0507 }
0508 
0509 /* initial one-time device setup.  MUST be called with the data interface
0510  * in altsetting 0
0511  */
0512 static int cdc_ncm_init(struct usbnet *dev)
0513 {
0514     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0515     u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
0516     int err;
0517 
0518     err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
0519                   USB_TYPE_CLASS | USB_DIR_IN
0520                   |USB_RECIP_INTERFACE,
0521                   0, iface_no, &ctx->ncm_parm,
0522                   sizeof(ctx->ncm_parm));
0523     if (err < 0) {
0524         dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
0525         return err; /* GET_NTB_PARAMETERS is required */
0526     }
0527 
0528     /* set CRC Mode */
0529     if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
0530         dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
0531         err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
0532                        USB_TYPE_CLASS | USB_DIR_OUT
0533                        | USB_RECIP_INTERFACE,
0534                        USB_CDC_NCM_CRC_NOT_APPENDED,
0535                        iface_no, NULL, 0);
0536         if (err < 0)
0537             dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
0538     }
0539 
0540     /* use ndp16 by default */
0541     ctx->is_ndp16 = 1;
0542 
0543     /* set NTB format, if both formats are supported.
0544      *
0545      * "The host shall only send this command while the NCM Data
0546      *  Interface is in alternate setting 0."
0547      */
0548     if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
0549                         USB_CDC_NCM_NTB32_SUPPORTED) {
0550         if (ctx->drvflags & CDC_NCM_FLAG_PREFER_NTB32) {
0551             ctx->is_ndp16 = 0;
0552             dev_dbg(&dev->intf->dev, "Setting NTB format to 32-bit\n");
0553             err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
0554                            USB_TYPE_CLASS | USB_DIR_OUT
0555                            | USB_RECIP_INTERFACE,
0556                            USB_CDC_NCM_NTB32_FORMAT,
0557                            iface_no, NULL, 0);
0558         } else {
0559             ctx->is_ndp16 = 1;
0560             dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
0561             err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
0562                            USB_TYPE_CLASS | USB_DIR_OUT
0563                            | USB_RECIP_INTERFACE,
0564                            USB_CDC_NCM_NTB16_FORMAT,
0565                            iface_no, NULL, 0);
0566         }
0567         if (err < 0) {
0568             ctx->is_ndp16 = 1;
0569             dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
0570         }
0571     }
0572 
0573     /* set initial device values */
0574     ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
0575     ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
0576     ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
0577     ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
0578     ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
0579     /* devices prior to NCM Errata shall set this field to zero */
0580     ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
0581 
0582     dev_dbg(&dev->intf->dev,
0583         "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
0584         ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
0585         ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
0586 
0587     /* max count of tx datagrams */
0588     if ((ctx->tx_max_datagrams == 0) ||
0589             (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
0590         ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
0591 
0592     /* set up maximum NDP size */
0593     if (ctx->is_ndp16)
0594         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
0595     else
0596         ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp32) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe32);
0597 
0598     /* initial coalescing timer interval */
0599     ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
0600 
0601     return 0;
0602 }
0603 
0604 /* set a new max datagram size */
0605 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
0606 {
0607     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0608     u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
0609     __le16 max_datagram_size;
0610     u16 mbim_mtu;
0611     int err;
0612 
0613     /* set default based on descriptors */
0614     ctx->max_datagram_size = clamp_t(u32, new_size,
0615                      cdc_ncm_min_dgram_size(dev),
0616                      CDC_NCM_MAX_DATAGRAM_SIZE);
0617 
0618     /* inform the device about the selected Max Datagram Size? */
0619     if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
0620         goto out;
0621 
0622     /* read current mtu value from device */
0623     err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
0624                   USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
0625                   0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
0626     if (err != sizeof(max_datagram_size)) {
0627         dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
0628         goto out;
0629     }
0630 
0631     if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
0632         goto out;
0633 
0634     max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
0635     err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
0636                    USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
0637                    0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
0638     if (err < 0)
0639         dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
0640 
0641 out:
0642     /* set MTU to max supported by the device if necessary */
0643     dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
0644 
0645     /* do not exceed operator preferred MTU */
0646     if (ctx->mbim_extended_desc) {
0647         mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
0648         if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
0649             dev->net->mtu = mbim_mtu;
0650     }
0651 }
0652 
0653 static void cdc_ncm_fix_modulus(struct usbnet *dev)
0654 {
0655     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0656     u32 val;
0657 
0658     /*
0659      * verify that the structure alignment is:
0660      * - power of two
0661      * - not greater than the maximum transmit length
0662      * - not less than four bytes
0663      */
0664     val = ctx->tx_ndp_modulus;
0665 
0666     if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
0667         (val != ((-val) & val)) || (val >= ctx->tx_max)) {
0668         dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
0669         ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
0670     }
0671 
0672     /*
0673      * verify that the payload alignment is:
0674      * - power of two
0675      * - not greater than the maximum transmit length
0676      * - not less than four bytes
0677      */
0678     val = ctx->tx_modulus;
0679 
0680     if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
0681         (val != ((-val) & val)) || (val >= ctx->tx_max)) {
0682         dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
0683         ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
0684     }
0685 
0686     /* verify the payload remainder */
0687     if (ctx->tx_remainder >= ctx->tx_modulus) {
0688         dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
0689         ctx->tx_remainder = 0;
0690     }
0691 
0692     /* adjust TX-remainder according to NCM specification. */
0693     ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
0694                  (ctx->tx_modulus - 1));
0695 }
0696 
0697 static int cdc_ncm_setup(struct usbnet *dev)
0698 {
0699     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0700     u32 def_rx, def_tx;
0701 
0702     /* be conservative when selecting initial buffer size to
0703      * increase the number of hosts this will work for
0704      */
0705     def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
0706                le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
0707     def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
0708                le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
0709 
0710     /* clamp rx_max and tx_max and inform device */
0711     cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
0712 
0713     /* sanitize the modulus and remainder values */
0714     cdc_ncm_fix_modulus(dev);
0715 
0716     /* set max datagram size */
0717     cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
0718     return 0;
0719 }
0720 
0721 static void
0722 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
0723 {
0724     struct usb_host_endpoint *e, *in = NULL, *out = NULL;
0725     u8 ep;
0726 
0727     for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
0728         e = intf->cur_altsetting->endpoint + ep;
0729 
0730         /* ignore endpoints which cannot transfer data */
0731         if (!usb_endpoint_maxp(&e->desc))
0732             continue;
0733 
0734         switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
0735         case USB_ENDPOINT_XFER_INT:
0736             if (usb_endpoint_dir_in(&e->desc)) {
0737                 if (!dev->status)
0738                     dev->status = e;
0739             }
0740             break;
0741 
0742         case USB_ENDPOINT_XFER_BULK:
0743             if (usb_endpoint_dir_in(&e->desc)) {
0744                 if (!in)
0745                     in = e;
0746             } else {
0747                 if (!out)
0748                     out = e;
0749             }
0750             break;
0751 
0752         default:
0753             break;
0754         }
0755     }
0756     if (in && !dev->in)
0757         dev->in = usb_rcvbulkpipe(dev->udev,
0758                       in->desc.bEndpointAddress &
0759                       USB_ENDPOINT_NUMBER_MASK);
0760     if (out && !dev->out)
0761         dev->out = usb_sndbulkpipe(dev->udev,
0762                        out->desc.bEndpointAddress &
0763                        USB_ENDPOINT_NUMBER_MASK);
0764 }
0765 
0766 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
0767 {
0768     if (ctx == NULL)
0769         return;
0770 
0771     if (ctx->tx_rem_skb != NULL) {
0772         dev_kfree_skb_any(ctx->tx_rem_skb);
0773         ctx->tx_rem_skb = NULL;
0774     }
0775 
0776     if (ctx->tx_curr_skb != NULL) {
0777         dev_kfree_skb_any(ctx->tx_curr_skb);
0778         ctx->tx_curr_skb = NULL;
0779     }
0780 
0781     if (ctx->is_ndp16)
0782         kfree(ctx->delayed_ndp16);
0783     else
0784         kfree(ctx->delayed_ndp32);
0785 
0786     kfree(ctx);
0787 }
0788 
0789 /* we need to override the usbnet change_mtu ndo for two reasons:
0790  *  - respect the negotiated maximum datagram size
0791  *  - avoid unwanted changes to rx and tx buffers
0792  */
0793 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
0794 {
0795     struct usbnet *dev = netdev_priv(net);
0796 
0797     net->mtu = new_mtu;
0798     cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
0799 
0800     return 0;
0801 }
0802 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
0803 
0804 static const struct net_device_ops cdc_ncm_netdev_ops = {
0805     .ndo_open        = usbnet_open,
0806     .ndo_stop        = usbnet_stop,
0807     .ndo_start_xmit      = usbnet_start_xmit,
0808     .ndo_tx_timeout      = usbnet_tx_timeout,
0809     .ndo_set_rx_mode     = usbnet_set_rx_mode,
0810     .ndo_get_stats64     = dev_get_tstats64,
0811     .ndo_change_mtu      = cdc_ncm_change_mtu,
0812     .ndo_set_mac_address = eth_mac_addr,
0813     .ndo_validate_addr   = eth_validate_addr,
0814 };
0815 
0816 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
0817 {
0818     struct cdc_ncm_ctx *ctx;
0819     struct usb_driver *driver;
0820     u8 *buf;
0821     int len;
0822     int temp;
0823     u8 iface_no;
0824     struct usb_cdc_parsed_header hdr;
0825 
0826     ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
0827     if (!ctx)
0828         return -ENOMEM;
0829 
0830     ctx->dev = dev;
0831 
0832     hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
0833     ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
0834     tasklet_setup(&ctx->bh, cdc_ncm_txpath_bh);
0835     atomic_set(&ctx->stop, 0);
0836     spin_lock_init(&ctx->mtx);
0837 
0838     /* store ctx pointer in device data field */
0839     dev->data[0] = (unsigned long)ctx;
0840 
0841     /* only the control interface can be successfully probed */
0842     ctx->control = intf;
0843 
0844     /* get some pointers */
0845     driver = driver_of(intf);
0846     buf = intf->cur_altsetting->extra;
0847     len = intf->cur_altsetting->extralen;
0848 
0849     /* parse through descriptors associated with control interface */
0850     cdc_parse_cdc_header(&hdr, intf, buf, len);
0851 
0852     if (hdr.usb_cdc_union_desc)
0853         ctx->data = usb_ifnum_to_if(dev->udev,
0854                         hdr.usb_cdc_union_desc->bSlaveInterface0);
0855     ctx->ether_desc = hdr.usb_cdc_ether_desc;
0856     ctx->func_desc = hdr.usb_cdc_ncm_desc;
0857     ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
0858     ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
0859 
0860     /* some buggy devices have an IAD but no CDC Union */
0861     if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
0862         ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
0863         dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
0864     }
0865 
0866     /* check if we got everything */
0867     if (!ctx->data) {
0868         dev_err(&intf->dev, "CDC Union missing and no IAD found\n");
0869         goto error;
0870     }
0871     if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
0872         if (!ctx->mbim_desc) {
0873             dev_err(&intf->dev, "MBIM functional descriptor missing\n");
0874             goto error;
0875         }
0876     } else {
0877         if (!ctx->ether_desc || !ctx->func_desc) {
0878             dev_err(&intf->dev, "NCM or ECM functional descriptors missing\n");
0879             goto error;
0880         }
0881     }
0882 
0883     /* claim data interface, if different from control */
0884     if (ctx->data != ctx->control) {
0885         temp = usb_driver_claim_interface(driver, ctx->data, dev);
0886         if (temp) {
0887             dev_err(&intf->dev, "failed to claim data intf\n");
0888             goto error;
0889         }
0890     }
0891 
0892     iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
0893 
0894     /* Device-specific flags */
0895     ctx->drvflags = drvflags;
0896 
0897     /* Reset data interface. Some devices will not reset properly
0898      * unless they are configured first.  Toggle the altsetting to
0899      * force a reset.
0900      * Some other devices do not work properly with this procedure
0901      * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
0902      */
0903     if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
0904         usb_set_interface(dev->udev, iface_no, data_altsetting);
0905 
0906     temp = usb_set_interface(dev->udev, iface_no, 0);
0907     if (temp) {
0908         dev_dbg(&intf->dev, "set interface failed\n");
0909         goto error2;
0910     }
0911 
0912     /* initialize basic device settings */
0913     if (cdc_ncm_init(dev))
0914         goto error2;
0915 
0916     /* Some firmwares need a pause here or they will silently fail
0917      * to set up the interface properly.  This value was decided
0918      * empirically on a Sierra Wireless MC7455 running 02.08.02.00
0919      * firmware.
0920      */
0921     usleep_range(10000, 20000);
0922 
0923     /* configure data interface */
0924     temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
0925     if (temp) {
0926         dev_dbg(&intf->dev, "set interface failed\n");
0927         goto error2;
0928     }
0929 
0930     cdc_ncm_find_endpoints(dev, ctx->data);
0931     cdc_ncm_find_endpoints(dev, ctx->control);
0932     if (!dev->in || !dev->out || !dev->status) {
0933         dev_dbg(&intf->dev, "failed to collect endpoints\n");
0934         goto error2;
0935     }
0936 
0937     usb_set_intfdata(ctx->control, dev);
0938 
0939     if (ctx->ether_desc) {
0940         temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
0941         if (temp) {
0942             dev_err(&intf->dev, "failed to get mac address\n");
0943             goto error2;
0944         }
0945         dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
0946     }
0947 
0948     /* finish setting up the device specific data */
0949     cdc_ncm_setup(dev);
0950 
0951     /* Allocate the delayed NDP if needed. */
0952     if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
0953         if (ctx->is_ndp16) {
0954             ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
0955             if (!ctx->delayed_ndp16)
0956                 goto error2;
0957         } else {
0958             ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
0959             if (!ctx->delayed_ndp32)
0960                 goto error2;
0961         }
0962         dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
0963     }
0964 
0965     /* override ethtool_ops */
0966     dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
0967 
0968     /* add our sysfs attrs */
0969     dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
0970 
0971     /* must handle MTU changes */
0972     dev->net->netdev_ops = &cdc_ncm_netdev_ops;
0973     dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
0974 
0975     return 0;
0976 
0977 error2:
0978     usb_set_intfdata(ctx->control, NULL);
0979     usb_set_intfdata(ctx->data, NULL);
0980     if (ctx->data != ctx->control)
0981         usb_driver_release_interface(driver, ctx->data);
0982 error:
0983     cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
0984     dev->data[0] = 0;
0985     dev_info(&intf->dev, "bind() failure\n");
0986     return -ENODEV;
0987 }
0988 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
0989 
0990 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
0991 {
0992     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
0993     struct usb_driver *driver = driver_of(intf);
0994 
0995     if (ctx == NULL)
0996         return;     /* no setup */
0997 
0998     atomic_set(&ctx->stop, 1);
0999 
1000     hrtimer_cancel(&ctx->tx_timer);
1001 
1002     tasklet_kill(&ctx->bh);
1003 
1004     /* handle devices with combined control and data interface */
1005     if (ctx->control == ctx->data)
1006         ctx->data = NULL;
1007 
1008     /* disconnect master --> disconnect slave */
1009     if (intf == ctx->control && ctx->data) {
1010         usb_set_intfdata(ctx->data, NULL);
1011         usb_driver_release_interface(driver, ctx->data);
1012         ctx->data = NULL;
1013 
1014     } else if (intf == ctx->data && ctx->control) {
1015         usb_set_intfdata(ctx->control, NULL);
1016         usb_driver_release_interface(driver, ctx->control);
1017         ctx->control = NULL;
1018     }
1019 
1020     usb_set_intfdata(intf, NULL);
1021     cdc_ncm_free(ctx);
1022 }
1023 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
1024 
1025 /* Return the number of the MBIM control interface altsetting iff it
1026  * is preferred and available,
1027  */
1028 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1029 {
1030     struct usb_host_interface *alt;
1031 
1032     /* The MBIM spec defines a NCM compatible default altsetting,
1033      * which we may have matched:
1034      *
1035      *  "Functions that implement both NCM 1.0 and MBIM (an
1036      *   “NCM/MBIM function”) according to this recommendation
1037      *   shall provide two alternate settings for the
1038      *   Communication Interface.  Alternate setting 0, and the
1039      *   associated class and endpoint descriptors, shall be
1040      *   constructed according to the rules given for the
1041      *   Communication Interface in section 5 of [USBNCM10].
1042      *   Alternate setting 1, and the associated class and
1043      *   endpoint descriptors, shall be constructed according to
1044      *   the rules given in section 6 (USB Device Model) of this
1045      *   specification."
1046      */
1047     if (intf->num_altsetting < 2)
1048         return intf->cur_altsetting->desc.bAlternateSetting;
1049 
1050     if (prefer_mbim) {
1051         alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1052         if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1053             return CDC_NCM_COMM_ALTSETTING_MBIM;
1054     }
1055     return CDC_NCM_COMM_ALTSETTING_NCM;
1056 }
1057 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1058 
1059 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1060 {
1061     /* MBIM backwards compatible function? */
1062     if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1063         return -ENODEV;
1064 
1065     /* The NCM data altsetting is fixed, so we hard-coded it.
1066      * Additionally, generic NCM devices are assumed to accept arbitrarily
1067      * placed NDP.
1068      */
1069     return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1070 }
1071 
1072 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1073 {
1074     size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1075 
1076     if (skb->len + align > max)
1077         align = max - skb->len;
1078     if (align && skb_tailroom(skb) >= align)
1079         skb_put_zero(skb, align);
1080 }
1081 
1082 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1083  * allocating a new one within skb
1084  */
1085 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1086 {
1087     struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1088     struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1089     size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1090 
1091     /* If NDP should be moved to the end of the NCM package, we can't follow the
1092     * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1093     * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1094     */
1095     if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1096         if (ctx->delayed_ndp16->dwSignature == sign)
1097             return ctx->delayed_ndp16;
1098 
1099         /* We can only push a single NDP to the end. Return
1100          * NULL to send what we've already got and queue this
1101          * skb for later.
1102          */
1103         else if (ctx->delayed_ndp16->dwSignature)
1104             return NULL;
1105     }
1106 
1107     /* follow the chain of NDPs, looking for a match */
1108     while (ndpoffset) {
1109         ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1110         if  (ndp16->dwSignature == sign)
1111             return ndp16;
1112         ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1113     }
1114 
1115     /* align new NDP */
1116     if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1117         cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1118 
1119     /* verify that there is room for the NDP and the datagram (reserve) */
1120     if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1121         return NULL;
1122 
1123     /* link to it */
1124     if (ndp16)
1125         ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1126     else
1127         nth16->wNdpIndex = cpu_to_le16(skb->len);
1128 
1129     /* push a new empty NDP */
1130     if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1131         ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1132     else
1133         ndp16 = ctx->delayed_ndp16;
1134 
1135     ndp16->dwSignature = sign;
1136     ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1137     return ndp16;
1138 }
1139 
1140 static struct usb_cdc_ncm_ndp32 *cdc_ncm_ndp32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1141 {
1142     struct usb_cdc_ncm_ndp32 *ndp32 = NULL;
1143     struct usb_cdc_ncm_nth32 *nth32 = (void *)skb->data;
1144     size_t ndpoffset = le32_to_cpu(nth32->dwNdpIndex);
1145 
1146     /* If NDP should be moved to the end of the NCM package, we can't follow the
1147      * NTH32 header as we would normally do. NDP isn't written to the SKB yet, and
1148      * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1149      */
1150     if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1151         if (ctx->delayed_ndp32->dwSignature == sign)
1152             return ctx->delayed_ndp32;
1153 
1154         /* We can only push a single NDP to the end. Return
1155          * NULL to send what we've already got and queue this
1156          * skb for later.
1157          */
1158         else if (ctx->delayed_ndp32->dwSignature)
1159             return NULL;
1160     }
1161 
1162     /* follow the chain of NDPs, looking for a match */
1163     while (ndpoffset) {
1164         ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb->data + ndpoffset);
1165         if  (ndp32->dwSignature == sign)
1166             return ndp32;
1167         ndpoffset = le32_to_cpu(ndp32->dwNextNdpIndex);
1168     }
1169 
1170     /* align new NDP */
1171     if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1172         cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1173 
1174     /* verify that there is room for the NDP and the datagram (reserve) */
1175     if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1176         return NULL;
1177 
1178     /* link to it */
1179     if (ndp32)
1180         ndp32->dwNextNdpIndex = cpu_to_le32(skb->len);
1181     else
1182         nth32->dwNdpIndex = cpu_to_le32(skb->len);
1183 
1184     /* push a new empty NDP */
1185     if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1186         ndp32 = skb_put_zero(skb, ctx->max_ndp_size);
1187     else
1188         ndp32 = ctx->delayed_ndp32;
1189 
1190     ndp32->dwSignature = sign;
1191     ndp32->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32));
1192     return ndp32;
1193 }
1194 
1195 struct sk_buff *
1196 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1197 {
1198     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1199     union {
1200         struct usb_cdc_ncm_nth16 *nth16;
1201         struct usb_cdc_ncm_nth32 *nth32;
1202     } nth;
1203     union {
1204         struct usb_cdc_ncm_ndp16 *ndp16;
1205         struct usb_cdc_ncm_ndp32 *ndp32;
1206     } ndp;
1207     struct sk_buff *skb_out;
1208     u16 n = 0, index, ndplen;
1209     u8 ready2send = 0;
1210     u32 delayed_ndp_size;
1211     size_t padding_count;
1212 
1213     /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1214      * accordingly. Otherwise, we should check here.
1215      */
1216     if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1217         delayed_ndp_size = ctx->max_ndp_size +
1218             max_t(u32,
1219                   ctx->tx_ndp_modulus,
1220                   ctx->tx_modulus + ctx->tx_remainder) - 1;
1221     else
1222         delayed_ndp_size = 0;
1223 
1224     /* if there is a remaining skb, it gets priority */
1225     if (skb != NULL) {
1226         swap(skb, ctx->tx_rem_skb);
1227         swap(sign, ctx->tx_rem_sign);
1228     } else {
1229         ready2send = 1;
1230     }
1231 
1232     /* check if we are resuming an OUT skb */
1233     skb_out = ctx->tx_curr_skb;
1234 
1235     /* allocate a new OUT skb */
1236     if (!skb_out) {
1237         if (ctx->tx_low_mem_val == 0) {
1238             ctx->tx_curr_size = ctx->tx_max;
1239             skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1240             /* If the memory allocation fails we will wait longer
1241              * each time before attempting another full size
1242              * allocation again to not overload the system
1243              * further.
1244              */
1245             if (skb_out == NULL) {
1246                 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1247                                   (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1248                 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1249             }
1250         }
1251         if (skb_out == NULL) {
1252             /* See if a very small allocation is possible.
1253              * We will send this packet immediately and hope
1254              * that there is more memory available later.
1255              */
1256             if (skb)
1257                 ctx->tx_curr_size = max(skb->len,
1258                     (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1259             else
1260                 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1261             skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1262 
1263             /* No allocation possible so we will abort */
1264             if (skb_out == NULL) {
1265                 if (skb != NULL) {
1266                     dev_kfree_skb_any(skb);
1267                     dev->net->stats.tx_dropped++;
1268                 }
1269                 goto exit_no_skb;
1270             }
1271             ctx->tx_low_mem_val--;
1272         }
1273         if (ctx->is_ndp16) {
1274             /* fill out the initial 16-bit NTB header */
1275             nth.nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1276             nth.nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1277             nth.nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1278             nth.nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1279         } else {
1280             /* fill out the initial 32-bit NTB header */
1281             nth.nth32 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth32));
1282             nth.nth32->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH32_SIGN);
1283             nth.nth32->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth32));
1284             nth.nth32->wSequence = cpu_to_le16(ctx->tx_seq++);
1285         }
1286 
1287         /* count total number of frames in this NTB */
1288         ctx->tx_curr_frame_num = 0;
1289 
1290         /* recent payload counter for this skb_out */
1291         ctx->tx_curr_frame_payload = 0;
1292     }
1293 
1294     for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1295         /* send any remaining skb first */
1296         if (skb == NULL) {
1297             skb = ctx->tx_rem_skb;
1298             sign = ctx->tx_rem_sign;
1299             ctx->tx_rem_skb = NULL;
1300 
1301             /* check for end of skb */
1302             if (skb == NULL)
1303                 break;
1304         }
1305 
1306         /* get the appropriate NDP for this skb */
1307         if (ctx->is_ndp16)
1308             ndp.ndp16 = cdc_ncm_ndp16(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1309         else
1310             ndp.ndp32 = cdc_ncm_ndp32(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1311 
1312         /* align beginning of next frame */
1313         cdc_ncm_align_tail(skb_out,  ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1314 
1315         /* check if we had enough room left for both NDP and frame */
1316         if ((ctx->is_ndp16 && !ndp.ndp16) || (!ctx->is_ndp16 && !ndp.ndp32) ||
1317             skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1318             if (n == 0) {
1319                 /* won't fit, MTU problem? */
1320                 dev_kfree_skb_any(skb);
1321                 skb = NULL;
1322                 dev->net->stats.tx_dropped++;
1323             } else {
1324                 /* no room for skb - store for later */
1325                 if (ctx->tx_rem_skb != NULL) {
1326                     dev_kfree_skb_any(ctx->tx_rem_skb);
1327                     dev->net->stats.tx_dropped++;
1328                 }
1329                 ctx->tx_rem_skb = skb;
1330                 ctx->tx_rem_sign = sign;
1331                 skb = NULL;
1332                 ready2send = 1;
1333                 ctx->tx_reason_ntb_full++;  /* count reason for transmitting */
1334             }
1335             break;
1336         }
1337 
1338         /* calculate frame number within this NDP */
1339         if (ctx->is_ndp16) {
1340             ndplen = le16_to_cpu(ndp.ndp16->wLength);
1341             index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1342 
1343             /* OK, add this skb */
1344             ndp.ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1345             ndp.ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1346             ndp.ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1347         } else {
1348             ndplen = le16_to_cpu(ndp.ndp32->wLength);
1349             index = (ndplen - sizeof(struct usb_cdc_ncm_ndp32)) / sizeof(struct usb_cdc_ncm_dpe32) - 1;
1350 
1351             ndp.ndp32->dpe32[index].dwDatagramLength = cpu_to_le32(skb->len);
1352             ndp.ndp32->dpe32[index].dwDatagramIndex = cpu_to_le32(skb_out->len);
1353             ndp.ndp32->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe32));
1354         }
1355         skb_put_data(skb_out, skb->data, skb->len);
1356         ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1357         dev_kfree_skb_any(skb);
1358         skb = NULL;
1359 
1360         /* send now if this NDP is full */
1361         if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1362             ready2send = 1;
1363             ctx->tx_reason_ndp_full++;  /* count reason for transmitting */
1364             break;
1365         }
1366     }
1367 
1368     /* free up any dangling skb */
1369     if (skb != NULL) {
1370         dev_kfree_skb_any(skb);
1371         skb = NULL;
1372         dev->net->stats.tx_dropped++;
1373     }
1374 
1375     ctx->tx_curr_frame_num = n;
1376 
1377     if (n == 0) {
1378         /* wait for more frames */
1379         /* push variables */
1380         ctx->tx_curr_skb = skb_out;
1381         goto exit_no_skb;
1382 
1383     } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1384         /* wait for more frames */
1385         /* push variables */
1386         ctx->tx_curr_skb = skb_out;
1387         /* set the pending count */
1388         if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1389             ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1390         goto exit_no_skb;
1391 
1392     } else {
1393         if (n == ctx->tx_max_datagrams)
1394             ctx->tx_reason_max_datagram++;  /* count reason for transmitting */
1395         /* frame goes out */
1396         /* variables will be reset at next call */
1397     }
1398 
1399     /* If requested, put NDP at end of frame. */
1400     if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1401         if (ctx->is_ndp16) {
1402             nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1403             cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1404             nth.nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1405             skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1406 
1407             /* Zero out delayed NDP - signature checking will naturally fail. */
1408             ndp.ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1409         } else {
1410             nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1411             cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1412             nth.nth32->dwNdpIndex = cpu_to_le32(skb_out->len);
1413             skb_put_data(skb_out, ctx->delayed_ndp32, ctx->max_ndp_size);
1414 
1415             ndp.ndp32 = memset(ctx->delayed_ndp32, 0, ctx->max_ndp_size);
1416         }
1417     }
1418 
1419     /* If collected data size is less or equal ctx->min_tx_pkt
1420      * bytes, we send buffers as it is. If we get more data, it
1421      * would be more efficient for USB HS mobile device with DMA
1422      * engine to receive a full size NTB, than canceling DMA
1423      * transfer and receiving a short packet.
1424      *
1425      * This optimization support is pointless if we end up sending
1426      * a ZLP after full sized NTBs.
1427      */
1428     if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1429         skb_out->len > ctx->min_tx_pkt) {
1430         padding_count = ctx->tx_curr_size - skb_out->len;
1431         if (!WARN_ON(padding_count > ctx->tx_curr_size))
1432             skb_put_zero(skb_out, padding_count);
1433     } else if (skb_out->len < ctx->tx_curr_size &&
1434            (skb_out->len % dev->maxpacket) == 0) {
1435         skb_put_u8(skb_out, 0); /* force short packet */
1436     }
1437 
1438     /* set final frame length */
1439     if (ctx->is_ndp16) {
1440         nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1441         nth.nth16->wBlockLength = cpu_to_le16(skb_out->len);
1442     } else {
1443         nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1444         nth.nth32->dwBlockLength = cpu_to_le32(skb_out->len);
1445     }
1446 
1447     /* return skb */
1448     ctx->tx_curr_skb = NULL;
1449 
1450     /* keep private stats: framing overhead and number of NTBs */
1451     ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1452     ctx->tx_ntbs++;
1453 
1454     /* usbnet will count all the framing overhead by default.
1455      * Adjust the stats so that the tx_bytes counter show real
1456      * payload data instead.
1457      */
1458     usbnet_set_skb_tx_stats(skb_out, n,
1459                 (long)ctx->tx_curr_frame_payload - skb_out->len);
1460 
1461     return skb_out;
1462 
1463 exit_no_skb:
1464     /* Start timer, if there is a remaining non-empty skb */
1465     if (ctx->tx_curr_skb != NULL && n > 0)
1466         cdc_ncm_tx_timeout_start(ctx);
1467     return NULL;
1468 }
1469 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1470 
1471 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1472 {
1473     /* start timer, if not already started */
1474     if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1475         hrtimer_start(&ctx->tx_timer,
1476                 ctx->timer_interval,
1477                 HRTIMER_MODE_REL);
1478 }
1479 
1480 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1481 {
1482     struct cdc_ncm_ctx *ctx =
1483             container_of(timer, struct cdc_ncm_ctx, tx_timer);
1484 
1485     if (!atomic_read(&ctx->stop))
1486         tasklet_schedule(&ctx->bh);
1487     return HRTIMER_NORESTART;
1488 }
1489 
1490 static void cdc_ncm_txpath_bh(struct tasklet_struct *t)
1491 {
1492     struct cdc_ncm_ctx *ctx = from_tasklet(ctx, t, bh);
1493     struct usbnet *dev = ctx->dev;
1494 
1495     spin_lock(&ctx->mtx);
1496     if (ctx->tx_timer_pending != 0) {
1497         ctx->tx_timer_pending--;
1498         cdc_ncm_tx_timeout_start(ctx);
1499         spin_unlock(&ctx->mtx);
1500     } else if (dev->net != NULL) {
1501         ctx->tx_reason_timeout++;   /* count reason for transmitting */
1502         spin_unlock(&ctx->mtx);
1503         netif_tx_lock_bh(dev->net);
1504         usbnet_start_xmit(NULL, dev->net);
1505         netif_tx_unlock_bh(dev->net);
1506     } else {
1507         spin_unlock(&ctx->mtx);
1508     }
1509 }
1510 
1511 struct sk_buff *
1512 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1513 {
1514     struct sk_buff *skb_out;
1515     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1516 
1517     /*
1518      * The Ethernet API we are using does not support transmitting
1519      * multiple Ethernet frames in a single call. This driver will
1520      * accumulate multiple Ethernet frames and send out a larger
1521      * USB frame when the USB buffer is full or when a single jiffies
1522      * timeout happens.
1523      */
1524     if (ctx == NULL)
1525         goto error;
1526 
1527     spin_lock_bh(&ctx->mtx);
1528 
1529     if (ctx->is_ndp16)
1530         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1531     else
1532         skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN));
1533 
1534     spin_unlock_bh(&ctx->mtx);
1535     return skb_out;
1536 
1537 error:
1538     if (skb != NULL)
1539         dev_kfree_skb_any(skb);
1540 
1541     return NULL;
1542 }
1543 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1544 
1545 /* verify NTB header and return offset of first NDP, or negative error */
1546 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1547 {
1548     struct usbnet *dev = netdev_priv(skb_in->dev);
1549     struct usb_cdc_ncm_nth16 *nth16;
1550     int len;
1551     int ret = -EINVAL;
1552 
1553     if (ctx == NULL)
1554         goto error;
1555 
1556     if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1557                     sizeof(struct usb_cdc_ncm_ndp16))) {
1558         netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1559         goto error;
1560     }
1561 
1562     nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1563 
1564     if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1565         netif_dbg(dev, rx_err, dev->net,
1566               "invalid NTH16 signature <%#010x>\n",
1567               le32_to_cpu(nth16->dwSignature));
1568         goto error;
1569     }
1570 
1571     len = le16_to_cpu(nth16->wBlockLength);
1572     if (len > ctx->rx_max) {
1573         netif_dbg(dev, rx_err, dev->net,
1574               "unsupported NTB block length %u/%u\n", len,
1575               ctx->rx_max);
1576         goto error;
1577     }
1578 
1579     if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1580         (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1581         !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1582         netif_dbg(dev, rx_err, dev->net,
1583               "sequence number glitch prev=%d curr=%d\n",
1584               ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1585     }
1586     ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1587 
1588     ret = le16_to_cpu(nth16->wNdpIndex);
1589 error:
1590     return ret;
1591 }
1592 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1593 
1594 int cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1595 {
1596     struct usbnet *dev = netdev_priv(skb_in->dev);
1597     struct usb_cdc_ncm_nth32 *nth32;
1598     int len;
1599     int ret = -EINVAL;
1600 
1601     if (ctx == NULL)
1602         goto error;
1603 
1604     if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth32) +
1605                     sizeof(struct usb_cdc_ncm_ndp32))) {
1606         netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1607         goto error;
1608     }
1609 
1610     nth32 = (struct usb_cdc_ncm_nth32 *)skb_in->data;
1611 
1612     if (nth32->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH32_SIGN)) {
1613         netif_dbg(dev, rx_err, dev->net,
1614               "invalid NTH32 signature <%#010x>\n",
1615               le32_to_cpu(nth32->dwSignature));
1616         goto error;
1617     }
1618 
1619     len = le32_to_cpu(nth32->dwBlockLength);
1620     if (len > ctx->rx_max) {
1621         netif_dbg(dev, rx_err, dev->net,
1622               "unsupported NTB block length %u/%u\n", len,
1623               ctx->rx_max);
1624         goto error;
1625     }
1626 
1627     if ((ctx->rx_seq + 1) != le16_to_cpu(nth32->wSequence) &&
1628         (ctx->rx_seq || le16_to_cpu(nth32->wSequence)) &&
1629         !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth32->wSequence))) {
1630         netif_dbg(dev, rx_err, dev->net,
1631               "sequence number glitch prev=%d curr=%d\n",
1632               ctx->rx_seq, le16_to_cpu(nth32->wSequence));
1633     }
1634     ctx->rx_seq = le16_to_cpu(nth32->wSequence);
1635 
1636     ret = le32_to_cpu(nth32->dwNdpIndex);
1637 error:
1638     return ret;
1639 }
1640 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth32);
1641 
1642 /* verify NDP header and return number of datagrams, or negative error */
1643 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1644 {
1645     struct usbnet *dev = netdev_priv(skb_in->dev);
1646     struct usb_cdc_ncm_ndp16 *ndp16;
1647     int ret = -EINVAL;
1648 
1649     if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1650         netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1651               ndpoffset);
1652         goto error;
1653     }
1654     ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1655 
1656     if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1657         netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1658               le16_to_cpu(ndp16->wLength));
1659         goto error;
1660     }
1661 
1662     ret = ((le16_to_cpu(ndp16->wLength) -
1663                     sizeof(struct usb_cdc_ncm_ndp16)) /
1664                     sizeof(struct usb_cdc_ncm_dpe16));
1665     ret--; /* we process NDP entries except for the last one */
1666 
1667     if ((sizeof(struct usb_cdc_ncm_ndp16) +
1668          ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1669         netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1670         ret = -EINVAL;
1671     }
1672 
1673 error:
1674     return ret;
1675 }
1676 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1677 
1678 /* verify NDP header and return number of datagrams, or negative error */
1679 int cdc_ncm_rx_verify_ndp32(struct sk_buff *skb_in, int ndpoffset)
1680 {
1681     struct usbnet *dev = netdev_priv(skb_in->dev);
1682     struct usb_cdc_ncm_ndp32 *ndp32;
1683     int ret = -EINVAL;
1684 
1685     if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp32)) > skb_in->len) {
1686         netif_dbg(dev, rx_err, dev->net, "invalid NDP offset  <%u>\n",
1687               ndpoffset);
1688         goto error;
1689     }
1690     ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1691 
1692     if (le16_to_cpu(ndp32->wLength) < USB_CDC_NCM_NDP32_LENGTH_MIN) {
1693         netif_dbg(dev, rx_err, dev->net, "invalid DPT32 length <%u>\n",
1694               le16_to_cpu(ndp32->wLength));
1695         goto error;
1696     }
1697 
1698     ret = ((le16_to_cpu(ndp32->wLength) -
1699                     sizeof(struct usb_cdc_ncm_ndp32)) /
1700                     sizeof(struct usb_cdc_ncm_dpe32));
1701     ret--; /* we process NDP entries except for the last one */
1702 
1703     if ((sizeof(struct usb_cdc_ncm_ndp32) +
1704          ret * (sizeof(struct usb_cdc_ncm_dpe32))) > skb_in->len) {
1705         netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1706         ret = -EINVAL;
1707     }
1708 
1709 error:
1710     return ret;
1711 }
1712 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp32);
1713 
1714 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1715 {
1716     struct sk_buff *skb;
1717     struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1718     unsigned int len;
1719     int nframes;
1720     int x;
1721     unsigned int offset;
1722     union {
1723         struct usb_cdc_ncm_ndp16 *ndp16;
1724         struct usb_cdc_ncm_ndp32 *ndp32;
1725     } ndp;
1726     union {
1727         struct usb_cdc_ncm_dpe16 *dpe16;
1728         struct usb_cdc_ncm_dpe32 *dpe32;
1729     } dpe;
1730 
1731     int ndpoffset;
1732     int loopcount = 50; /* arbitrary max preventing infinite loop */
1733     u32 payload = 0;
1734 
1735     if (ctx->is_ndp16)
1736         ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1737     else
1738         ndpoffset = cdc_ncm_rx_verify_nth32(ctx, skb_in);
1739 
1740     if (ndpoffset < 0)
1741         goto error;
1742 
1743 next_ndp:
1744     if (ctx->is_ndp16) {
1745         nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1746         if (nframes < 0)
1747             goto error;
1748 
1749         ndp.ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1750 
1751         if (ndp.ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1752             netif_dbg(dev, rx_err, dev->net,
1753                   "invalid DPT16 signature <%#010x>\n",
1754                   le32_to_cpu(ndp.ndp16->dwSignature));
1755             goto err_ndp;
1756         }
1757         dpe.dpe16 = ndp.ndp16->dpe16;
1758     } else {
1759         nframes = cdc_ncm_rx_verify_ndp32(skb_in, ndpoffset);
1760         if (nframes < 0)
1761             goto error;
1762 
1763         ndp.ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
1764 
1765         if (ndp.ndp32->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN)) {
1766             netif_dbg(dev, rx_err, dev->net,
1767                   "invalid DPT32 signature <%#010x>\n",
1768                   le32_to_cpu(ndp.ndp32->dwSignature));
1769             goto err_ndp;
1770         }
1771         dpe.dpe32 = ndp.ndp32->dpe32;
1772     }
1773 
1774     for (x = 0; x < nframes; x++) {
1775         if (ctx->is_ndp16) {
1776             offset = le16_to_cpu(dpe.dpe16->wDatagramIndex);
1777             len = le16_to_cpu(dpe.dpe16->wDatagramLength);
1778         } else {
1779             offset = le32_to_cpu(dpe.dpe32->dwDatagramIndex);
1780             len = le32_to_cpu(dpe.dpe32->dwDatagramLength);
1781         }
1782 
1783         /*
1784          * CDC NCM ch. 3.7
1785          * All entries after first NULL entry are to be ignored
1786          */
1787         if ((offset == 0) || (len == 0)) {
1788             if (!x)
1789                 goto err_ndp; /* empty NTB */
1790             break;
1791         }
1792 
1793         /* sanity checking - watch out for integer wrap*/
1794         if ((offset > skb_in->len) || (len > skb_in->len - offset) ||
1795                 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1796             netif_dbg(dev, rx_err, dev->net,
1797                   "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1798                   x, offset, len, skb_in);
1799             if (!x)
1800                 goto err_ndp;
1801             break;
1802 
1803         } else {
1804             /* create a fresh copy to reduce truesize */
1805             skb = netdev_alloc_skb_ip_align(dev->net,  len);
1806             if (!skb)
1807                 goto error;
1808             skb_put_data(skb, skb_in->data + offset, len);
1809             usbnet_skb_return(dev, skb);
1810             payload += len; /* count payload bytes in this NTB */
1811         }
1812 
1813         if (ctx->is_ndp16)
1814             dpe.dpe16++;
1815         else
1816             dpe.dpe32++;
1817     }
1818 err_ndp:
1819     /* are there more NDPs to process? */
1820     if (ctx->is_ndp16)
1821         ndpoffset = le16_to_cpu(ndp.ndp16->wNextNdpIndex);
1822     else
1823         ndpoffset = le32_to_cpu(ndp.ndp32->dwNextNdpIndex);
1824 
1825     if (ndpoffset && loopcount--)
1826         goto next_ndp;
1827 
1828     /* update stats */
1829     ctx->rx_overhead += skb_in->len - payload;
1830     ctx->rx_ntbs++;
1831 
1832     return 1;
1833 error:
1834     return 0;
1835 }
1836 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1837 
1838 static void
1839 cdc_ncm_speed_change(struct usbnet *dev,
1840              struct usb_cdc_speed_change *data)
1841 {
1842     /* RTL8156 shipped before 2021 sends notification about every 32ms. */
1843     dev->rx_speed = le32_to_cpu(data->DLBitRRate);
1844     dev->tx_speed = le32_to_cpu(data->ULBitRate);
1845 }
1846 
1847 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1848 {
1849     struct usb_cdc_notification *event;
1850 
1851     if (urb->actual_length < sizeof(*event))
1852         return;
1853 
1854     /* test for split data in 8-byte chunks */
1855     if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1856         cdc_ncm_speed_change(dev,
1857               (struct usb_cdc_speed_change *)urb->transfer_buffer);
1858         return;
1859     }
1860 
1861     event = urb->transfer_buffer;
1862 
1863     switch (event->bNotificationType) {
1864     case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1865         /*
1866          * According to the CDC NCM specification ch.7.1
1867          * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1868          * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1869          */
1870         /* RTL8156 shipped before 2021 sends notification about
1871          * every 32ms. Don't forward notification if state is same.
1872          */
1873         if (netif_carrier_ok(dev->net) != !!event->wValue)
1874             usbnet_link_change(dev, !!event->wValue, 0);
1875         break;
1876 
1877     case USB_CDC_NOTIFY_SPEED_CHANGE:
1878         if (urb->actual_length < (sizeof(*event) +
1879                     sizeof(struct usb_cdc_speed_change)))
1880             set_bit(EVENT_STS_SPLIT, &dev->flags);
1881         else
1882             cdc_ncm_speed_change(dev,
1883                          (struct usb_cdc_speed_change *)&event[1]);
1884         break;
1885 
1886     default:
1887         dev_dbg(&dev->udev->dev,
1888             "NCM: unexpected notification 0x%02x!\n",
1889             event->bNotificationType);
1890         break;
1891     }
1892 }
1893 
1894 static const struct driver_info cdc_ncm_info = {
1895     .description = "CDC NCM (NO ZLP)",
1896     .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1897             | FLAG_LINK_INTR | FLAG_ETHER,
1898     .bind = cdc_ncm_bind,
1899     .unbind = cdc_ncm_unbind,
1900     .manage_power = usbnet_manage_power,
1901     .status = cdc_ncm_status,
1902     .rx_fixup = cdc_ncm_rx_fixup,
1903     .tx_fixup = cdc_ncm_tx_fixup,
1904     .set_rx_mode = usbnet_cdc_update_filter,
1905 };
1906 
1907 /* Same as cdc_ncm_info, but with FLAG_SEND_ZLP  */
1908 static const struct driver_info cdc_ncm_zlp_info = {
1909     .description = "CDC NCM (SEND ZLP)",
1910     .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1911             | FLAG_LINK_INTR | FLAG_ETHER | FLAG_SEND_ZLP,
1912     .bind = cdc_ncm_bind,
1913     .unbind = cdc_ncm_unbind,
1914     .manage_power = usbnet_manage_power,
1915     .status = cdc_ncm_status,
1916     .rx_fixup = cdc_ncm_rx_fixup,
1917     .tx_fixup = cdc_ncm_tx_fixup,
1918 };
1919 
1920 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1921 static const struct driver_info wwan_info = {
1922     .description = "Mobile Broadband Network Device",
1923     .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1924             | FLAG_LINK_INTR | FLAG_WWAN,
1925     .bind = cdc_ncm_bind,
1926     .unbind = cdc_ncm_unbind,
1927     .manage_power = usbnet_manage_power,
1928     .status = cdc_ncm_status,
1929     .rx_fixup = cdc_ncm_rx_fixup,
1930     .tx_fixup = cdc_ncm_tx_fixup,
1931     .set_rx_mode = usbnet_cdc_update_filter,
1932 };
1933 
1934 /* Same as wwan_info, but with FLAG_NOARP  */
1935 static const struct driver_info wwan_noarp_info = {
1936     .description = "Mobile Broadband Network Device (NO ARP)",
1937     .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1938             | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1939     .bind = cdc_ncm_bind,
1940     .unbind = cdc_ncm_unbind,
1941     .manage_power = usbnet_manage_power,
1942     .status = cdc_ncm_status,
1943     .rx_fixup = cdc_ncm_rx_fixup,
1944     .tx_fixup = cdc_ncm_tx_fixup,
1945     .set_rx_mode = usbnet_cdc_update_filter,
1946 };
1947 
1948 static const struct usb_device_id cdc_devs[] = {
1949     /* Ericsson MBM devices like F5521gw */
1950     { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1951         | USB_DEVICE_ID_MATCH_VENDOR,
1952       .idVendor = 0x0bdb,
1953       .bInterfaceClass = USB_CLASS_COMM,
1954       .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1955       .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1956       .driver_info = (unsigned long) &wwan_info,
1957     },
1958 
1959     /* Telit LE910 V2 */
1960     { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1961         USB_CLASS_COMM,
1962         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1963       .driver_info = (unsigned long)&wwan_noarp_info,
1964     },
1965 
1966     /* DW5812 LTE Verizon Mobile Broadband Card
1967      * Unlike DW5550 this device requires FLAG_NOARP
1968      */
1969     { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1970         USB_CLASS_COMM,
1971         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1972       .driver_info = (unsigned long)&wwan_noarp_info,
1973     },
1974 
1975     /* DW5813 LTE AT&T Mobile Broadband Card
1976      * Unlike DW5550 this device requires FLAG_NOARP
1977      */
1978     { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1979         USB_CLASS_COMM,
1980         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1981       .driver_info = (unsigned long)&wwan_noarp_info,
1982     },
1983 
1984     /* Dell branded MBM devices like DW5550 */
1985     { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1986         | USB_DEVICE_ID_MATCH_VENDOR,
1987       .idVendor = 0x413c,
1988       .bInterfaceClass = USB_CLASS_COMM,
1989       .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1990       .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1991       .driver_info = (unsigned long) &wwan_info,
1992     },
1993 
1994     /* Toshiba branded MBM devices */
1995     { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1996         | USB_DEVICE_ID_MATCH_VENDOR,
1997       .idVendor = 0x0930,
1998       .bInterfaceClass = USB_CLASS_COMM,
1999       .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2000       .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2001       .driver_info = (unsigned long) &wwan_info,
2002     },
2003 
2004     /* tag Huawei devices as wwan */
2005     { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
2006                     USB_CLASS_COMM,
2007                     USB_CDC_SUBCLASS_NCM,
2008                     USB_CDC_PROTO_NONE),
2009       .driver_info = (unsigned long)&wwan_info,
2010     },
2011 
2012     /* Infineon(now Intel) HSPA Modem platform */
2013     { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
2014         USB_CLASS_COMM,
2015         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2016       .driver_info = (unsigned long)&wwan_noarp_info,
2017     },
2018 
2019     /* u-blox TOBY-L4 */
2020     { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
2021         USB_CLASS_COMM,
2022         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2023       .driver_info = (unsigned long)&wwan_info,
2024     },
2025 
2026     /* DisplayLink docking stations */
2027     { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
2028         | USB_DEVICE_ID_MATCH_VENDOR,
2029       .idVendor = 0x17e9,
2030       .bInterfaceClass = USB_CLASS_COMM,
2031       .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
2032       .bInterfaceProtocol = USB_CDC_PROTO_NONE,
2033       .driver_info = (unsigned long)&cdc_ncm_zlp_info,
2034     },
2035 
2036     /* Generic CDC-NCM devices */
2037     { USB_INTERFACE_INFO(USB_CLASS_COMM,
2038         USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2039         .driver_info = (unsigned long)&cdc_ncm_info,
2040     },
2041     {
2042     },
2043 };
2044 MODULE_DEVICE_TABLE(usb, cdc_devs);
2045 
2046 static struct usb_driver cdc_ncm_driver = {
2047     .name = "cdc_ncm",
2048     .id_table = cdc_devs,
2049     .probe = usbnet_probe,
2050     .disconnect = usbnet_disconnect,
2051     .suspend = usbnet_suspend,
2052     .resume = usbnet_resume,
2053     .reset_resume = usbnet_resume,
2054     .supports_autosuspend = 1,
2055     .disable_hub_initiated_lpm = 1,
2056 };
2057 
2058 module_usb_driver(cdc_ncm_driver);
2059 
2060 MODULE_AUTHOR("Hans Petter Selasky");
2061 MODULE_DESCRIPTION("USB CDC NCM host driver");
2062 MODULE_LICENSE("Dual BSD/GPL");
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