4 * Copyright (C) ST-Ericsson 2010-2012
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
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:
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
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.
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
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>
56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
57 static bool prefer_mbim = true;
59 static bool prefer_mbim;
61 module_param(prefer_mbim, bool, 0644);
62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
64 static void cdc_ncm_txpath_bh(struct tasklet_struct *t);
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;
69 struct cdc_ncm_stats {
70 char stat_string[ETH_GSTRING_LEN];
75 #define CDC_NCM_STAT(str, m) { \
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)
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),
92 #define CDC_NCM_LOW_MEM_MAX_CNT 10
94 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
98 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
105 struct ethtool_stats __always_unused *stats,
108 struct usbnet *dev = netdev_priv(netdev);
109 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
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;
119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
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;
133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
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_internal,
146 .set_link_ksettings = NULL,
149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
151 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
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));
158 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
160 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
161 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
165 val = clamp_t(u32, new_rx, min, max);
167 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
174 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
177 /* clamp new_tx to sane values */
179 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
181 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth32);
183 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
185 max = CDC_NCM_NTB_MAX_SIZE_TX; /* dwNtbOutMaxSize not set */
187 /* some devices set dwNtbOutMaxSize too low for the above default */
190 val = clamp_t(u32, new_tx, min, max);
192 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
197 static ssize_t min_tx_pkt_show(struct device *d,
198 struct device_attribute *attr, char *buf)
200 struct usbnet *dev = netdev_priv(to_net_dev(d));
201 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
203 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
206 static ssize_t rx_max_show(struct device *d,
207 struct device_attribute *attr, char *buf)
209 struct usbnet *dev = netdev_priv(to_net_dev(d));
210 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
212 return sprintf(buf, "%u\n", ctx->rx_max);
215 static ssize_t tx_max_show(struct device *d,
216 struct device_attribute *attr, char *buf)
218 struct usbnet *dev = netdev_priv(to_net_dev(d));
219 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
221 return sprintf(buf, "%u\n", ctx->tx_max);
224 static ssize_t tx_timer_usecs_show(struct device *d,
225 struct device_attribute *attr, char *buf)
227 struct usbnet *dev = netdev_priv(to_net_dev(d));
228 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
230 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
233 static ssize_t min_tx_pkt_store(struct device *d,
234 struct device_attribute *attr,
235 const char *buf, size_t len)
237 struct usbnet *dev = netdev_priv(to_net_dev(d));
238 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
241 /* no need to restrict values - anything from 0 to infinity is OK */
242 if (kstrtoul(buf, 0, &val))
245 ctx->min_tx_pkt = val;
249 static ssize_t rx_max_store(struct device *d,
250 struct device_attribute *attr,
251 const char *buf, size_t len)
253 struct usbnet *dev = netdev_priv(to_net_dev(d));
254 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
257 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
260 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
264 static ssize_t tx_max_store(struct device *d,
265 struct device_attribute *attr,
266 const char *buf, size_t len)
268 struct usbnet *dev = netdev_priv(to_net_dev(d));
269 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
272 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
275 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
279 static ssize_t tx_timer_usecs_store(struct device *d,
280 struct device_attribute *attr,
281 const char *buf, size_t len)
283 struct usbnet *dev = netdev_priv(to_net_dev(d));
284 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
288 ret = kstrtoul(buf, 0, &val);
291 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
294 spin_lock_bh(&ctx->mtx);
295 ctx->timer_interval = val * NSEC_PER_USEC;
296 if (!ctx->timer_interval)
297 ctx->tx_timer_pending = 0;
298 spin_unlock_bh(&ctx->mtx);
302 static DEVICE_ATTR_RW(min_tx_pkt);
303 static DEVICE_ATTR_RW(rx_max);
304 static DEVICE_ATTR_RW(tx_max);
305 static DEVICE_ATTR_RW(tx_timer_usecs);
307 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
309 struct usbnet *dev = netdev_priv(to_net_dev(d));
310 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
312 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
315 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
317 struct usbnet *dev = netdev_priv(to_net_dev(d));
318 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
321 if (strtobool(buf, &enable))
325 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
329 if (ctx->is_ndp16 && !ctx->delayed_ndp16) {
330 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
331 if (!ctx->delayed_ndp16)
334 if (!ctx->is_ndp16 && !ctx->delayed_ndp32) {
335 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
336 if (!ctx->delayed_ndp32)
341 /* flush pending data before changing flag */
342 netif_tx_lock_bh(dev->net);
343 usbnet_start_xmit(NULL, dev->net);
344 spin_lock_bh(&ctx->mtx);
346 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
348 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
349 spin_unlock_bh(&ctx->mtx);
350 netif_tx_unlock_bh(dev->net);
354 static DEVICE_ATTR_RW(ndp_to_end);
356 #define NCM_PARM_ATTR(name, format, tocpu) \
357 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
359 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
360 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
361 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
363 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
365 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
366 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
367 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
368 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
369 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
370 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
371 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
372 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
373 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
374 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
376 static struct attribute *cdc_ncm_sysfs_attrs[] = {
377 &dev_attr_min_tx_pkt.attr,
378 &dev_attr_ndp_to_end.attr,
379 &dev_attr_rx_max.attr,
380 &dev_attr_tx_max.attr,
381 &dev_attr_tx_timer_usecs.attr,
382 &dev_attr_bmNtbFormatsSupported.attr,
383 &dev_attr_dwNtbInMaxSize.attr,
384 &dev_attr_wNdpInDivisor.attr,
385 &dev_attr_wNdpInPayloadRemainder.attr,
386 &dev_attr_wNdpInAlignment.attr,
387 &dev_attr_dwNtbOutMaxSize.attr,
388 &dev_attr_wNdpOutDivisor.attr,
389 &dev_attr_wNdpOutPayloadRemainder.attr,
390 &dev_attr_wNdpOutAlignment.attr,
391 &dev_attr_wNtbOutMaxDatagrams.attr,
395 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
397 .attrs = cdc_ncm_sysfs_attrs,
400 /* handle rx_max and tx_max changes */
401 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
403 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
404 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
407 val = cdc_ncm_check_rx_max(dev, new_rx);
409 /* inform device about NTB input size changes */
410 if (val != ctx->rx_max) {
411 __le32 dwNtbInMaxSize = cpu_to_le32(val);
413 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
415 /* tell device to use new size */
416 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
417 USB_TYPE_CLASS | USB_DIR_OUT
418 | USB_RECIP_INTERFACE,
419 0, iface_no, &dwNtbInMaxSize, 4) < 0)
420 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
425 /* usbnet use these values for sizing rx queues */
426 if (dev->rx_urb_size != ctx->rx_max) {
427 dev->rx_urb_size = ctx->rx_max;
428 if (netif_running(dev->net))
429 usbnet_unlink_rx_urbs(dev);
432 val = cdc_ncm_check_tx_max(dev, new_tx);
433 if (val != ctx->tx_max)
434 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
436 /* Adding a pad byte here if necessary simplifies the handling
437 * in cdc_ncm_fill_tx_frame, making tx_max always represent
438 * the real skb max size.
440 * We cannot use dev->maxpacket here because this is called from
441 * .bind which is called before usbnet sets up dev->maxpacket
443 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
444 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
447 /* we might need to flush any pending tx buffers if running */
448 if (netif_running(dev->net) && val > ctx->tx_max) {
449 netif_tx_lock_bh(dev->net);
450 usbnet_start_xmit(NULL, dev->net);
451 /* make sure tx_curr_skb is reallocated if it was empty */
452 if (ctx->tx_curr_skb) {
453 dev_kfree_skb_any(ctx->tx_curr_skb);
454 ctx->tx_curr_skb = NULL;
457 netif_tx_unlock_bh(dev->net);
462 dev->hard_mtu = ctx->tx_max;
464 /* max qlen depend on hard_mtu and rx_urb_size */
465 usbnet_update_max_qlen(dev);
467 /* never pad more than 3 full USB packets per transfer */
468 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
469 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
472 /* helpers for NCM and MBIM differences */
473 static u8 cdc_ncm_flags(struct usbnet *dev)
475 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
477 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
478 return ctx->mbim_desc->bmNetworkCapabilities;
480 return ctx->func_desc->bmNetworkCapabilities;
484 static int cdc_ncm_eth_hlen(struct usbnet *dev)
486 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
491 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
493 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
494 return CDC_MBIM_MIN_DATAGRAM_SIZE;
495 return CDC_NCM_MIN_DATAGRAM_SIZE;
498 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
500 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
502 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
503 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
505 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
506 return CDC_NCM_MAX_DATAGRAM_SIZE;
509 /* initial one-time device setup. MUST be called with the data interface
512 static int cdc_ncm_init(struct usbnet *dev)
514 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
515 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
518 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
519 USB_TYPE_CLASS | USB_DIR_IN
520 |USB_RECIP_INTERFACE,
521 0, iface_no, &ctx->ncm_parm,
522 sizeof(ctx->ncm_parm));
524 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
525 return err; /* GET_NTB_PARAMETERS is required */
529 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
530 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
531 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
532 USB_TYPE_CLASS | USB_DIR_OUT
533 | USB_RECIP_INTERFACE,
534 USB_CDC_NCM_CRC_NOT_APPENDED,
537 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
540 /* use ndp16 by default */
543 /* set NTB format, if both formats are supported.
545 * "The host shall only send this command while the NCM Data
546 * Interface is in alternate setting 0."
548 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
549 USB_CDC_NCM_NTB32_SUPPORTED) {
550 if (ctx->drvflags & CDC_NCM_FLAG_PREFER_NTB32) {
552 dev_dbg(&dev->intf->dev, "Setting NTB format to 32-bit\n");
553 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
554 USB_TYPE_CLASS | USB_DIR_OUT
555 | USB_RECIP_INTERFACE,
556 USB_CDC_NCM_NTB32_FORMAT,
560 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
561 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
562 USB_TYPE_CLASS | USB_DIR_OUT
563 | USB_RECIP_INTERFACE,
564 USB_CDC_NCM_NTB16_FORMAT,
569 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
573 /* set initial device values */
574 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
575 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
576 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
577 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
578 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
579 /* devices prior to NCM Errata shall set this field to zero */
580 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
582 dev_dbg(&dev->intf->dev,
583 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
584 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
585 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
587 /* max count of tx datagrams */
588 if ((ctx->tx_max_datagrams == 0) ||
589 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
590 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
592 /* set up maximum NDP size */
594 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
596 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp32) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe32);
598 /* initial coalescing timer interval */
599 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
604 /* set a new max datagram size */
605 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
607 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
608 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
609 __le16 max_datagram_size;
613 /* set default based on descriptors */
614 ctx->max_datagram_size = clamp_t(u32, new_size,
615 cdc_ncm_min_dgram_size(dev),
616 CDC_NCM_MAX_DATAGRAM_SIZE);
618 /* inform the device about the selected Max Datagram Size? */
619 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
622 /* read current mtu value from device */
623 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
624 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
625 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
626 if (err != sizeof(max_datagram_size)) {
627 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
631 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
634 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
635 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
636 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
637 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
639 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
642 /* set MTU to max supported by the device if necessary */
643 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
645 /* do not exceed operator preferred MTU */
646 if (ctx->mbim_extended_desc) {
647 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
648 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
649 dev->net->mtu = mbim_mtu;
653 static void cdc_ncm_fix_modulus(struct usbnet *dev)
655 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
659 * verify that the structure alignment is:
661 * - not greater than the maximum transmit length
662 * - not less than four bytes
664 val = ctx->tx_ndp_modulus;
666 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
667 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
668 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
669 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
673 * verify that the payload alignment is:
675 * - not greater than the maximum transmit length
676 * - not less than four bytes
678 val = ctx->tx_modulus;
680 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
681 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
682 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
683 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
686 /* verify the payload remainder */
687 if (ctx->tx_remainder >= ctx->tx_modulus) {
688 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
689 ctx->tx_remainder = 0;
692 /* adjust TX-remainder according to NCM specification. */
693 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
694 (ctx->tx_modulus - 1));
697 static int cdc_ncm_setup(struct usbnet *dev)
699 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
702 /* be conservative when selecting initial buffer size to
703 * increase the number of hosts this will work for
705 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
706 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
707 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
708 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
710 /* clamp rx_max and tx_max and inform device */
711 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
713 /* sanitize the modulus and remainder values */
714 cdc_ncm_fix_modulus(dev);
716 /* set max datagram size */
717 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
722 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
724 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
727 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
728 e = intf->cur_altsetting->endpoint + ep;
730 /* ignore endpoints which cannot transfer data */
731 if (!usb_endpoint_maxp(&e->desc))
734 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
735 case USB_ENDPOINT_XFER_INT:
736 if (usb_endpoint_dir_in(&e->desc)) {
742 case USB_ENDPOINT_XFER_BULK:
743 if (usb_endpoint_dir_in(&e->desc)) {
757 dev->in = usb_rcvbulkpipe(dev->udev,
758 in->desc.bEndpointAddress &
759 USB_ENDPOINT_NUMBER_MASK);
760 if (out && !dev->out)
761 dev->out = usb_sndbulkpipe(dev->udev,
762 out->desc.bEndpointAddress &
763 USB_ENDPOINT_NUMBER_MASK);
766 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
771 if (ctx->tx_rem_skb != NULL) {
772 dev_kfree_skb_any(ctx->tx_rem_skb);
773 ctx->tx_rem_skb = NULL;
776 if (ctx->tx_curr_skb != NULL) {
777 dev_kfree_skb_any(ctx->tx_curr_skb);
778 ctx->tx_curr_skb = NULL;
782 kfree(ctx->delayed_ndp16);
784 kfree(ctx->delayed_ndp32);
789 /* we need to override the usbnet change_mtu ndo for two reasons:
790 * - respect the negotiated maximum datagram size
791 * - avoid unwanted changes to rx and tx buffers
793 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
795 struct usbnet *dev = netdev_priv(net);
798 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
802 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
804 static const struct net_device_ops cdc_ncm_netdev_ops = {
805 .ndo_open = usbnet_open,
806 .ndo_stop = usbnet_stop,
807 .ndo_start_xmit = usbnet_start_xmit,
808 .ndo_tx_timeout = usbnet_tx_timeout,
809 .ndo_set_rx_mode = usbnet_set_rx_mode,
810 .ndo_get_stats64 = dev_get_tstats64,
811 .ndo_change_mtu = cdc_ncm_change_mtu,
812 .ndo_set_mac_address = eth_mac_addr,
813 .ndo_validate_addr = eth_validate_addr,
816 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
818 struct cdc_ncm_ctx *ctx;
819 struct usb_driver *driver;
824 struct usb_cdc_parsed_header hdr;
826 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
832 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
833 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
834 tasklet_setup(&ctx->bh, cdc_ncm_txpath_bh);
835 atomic_set(&ctx->stop, 0);
836 spin_lock_init(&ctx->mtx);
838 /* store ctx pointer in device data field */
839 dev->data[0] = (unsigned long)ctx;
841 /* only the control interface can be successfully probed */
844 /* get some pointers */
845 driver = driver_of(intf);
846 buf = intf->cur_altsetting->extra;
847 len = intf->cur_altsetting->extralen;
849 /* parse through descriptors associated with control interface */
850 cdc_parse_cdc_header(&hdr, intf, buf, len);
852 if (hdr.usb_cdc_union_desc)
853 ctx->data = usb_ifnum_to_if(dev->udev,
854 hdr.usb_cdc_union_desc->bSlaveInterface0);
855 ctx->ether_desc = hdr.usb_cdc_ether_desc;
856 ctx->func_desc = hdr.usb_cdc_ncm_desc;
857 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
858 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
860 /* some buggy devices have an IAD but no CDC Union */
861 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
862 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
863 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
866 /* check if we got everything */
868 dev_err(&intf->dev, "CDC Union missing and no IAD found\n");
871 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
872 if (!ctx->mbim_desc) {
873 dev_err(&intf->dev, "MBIM functional descriptor missing\n");
877 if (!ctx->ether_desc || !ctx->func_desc) {
878 dev_err(&intf->dev, "NCM or ECM functional descriptors missing\n");
883 /* claim data interface, if different from control */
884 if (ctx->data != ctx->control) {
885 temp = usb_driver_claim_interface(driver, ctx->data, dev);
887 dev_err(&intf->dev, "failed to claim data intf\n");
892 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
894 /* Device-specific flags */
895 ctx->drvflags = drvflags;
897 /* Reset data interface. Some devices will not reset properly
898 * unless they are configured first. Toggle the altsetting to
900 * Some other devices do not work properly with this procedure
901 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
903 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
904 usb_set_interface(dev->udev, iface_no, data_altsetting);
906 temp = usb_set_interface(dev->udev, iface_no, 0);
908 dev_dbg(&intf->dev, "set interface failed\n");
912 /* initialize basic device settings */
913 if (cdc_ncm_init(dev))
916 /* Some firmwares need a pause here or they will silently fail
917 * to set up the interface properly. This value was decided
918 * empirically on a Sierra Wireless MC7455 running 02.08.02.00
921 usleep_range(10000, 20000);
923 /* configure data interface */
924 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
926 dev_dbg(&intf->dev, "set interface failed\n");
930 cdc_ncm_find_endpoints(dev, ctx->data);
931 cdc_ncm_find_endpoints(dev, ctx->control);
932 if (!dev->in || !dev->out || !dev->status) {
933 dev_dbg(&intf->dev, "failed to collect endpoints\n");
937 usb_set_intfdata(ctx->control, dev);
939 if (ctx->ether_desc) {
940 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
942 dev_err(&intf->dev, "failed to get mac address\n");
945 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
948 /* finish setting up the device specific data */
951 /* Allocate the delayed NDP if needed. */
952 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
954 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
955 if (!ctx->delayed_ndp16)
958 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
959 if (!ctx->delayed_ndp32)
962 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
965 /* override ethtool_ops */
966 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
968 /* add our sysfs attrs */
969 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
971 /* must handle MTU changes */
972 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
973 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
978 usb_set_intfdata(ctx->control, NULL);
979 usb_set_intfdata(ctx->data, NULL);
980 if (ctx->data != ctx->control)
981 usb_driver_release_interface(driver, ctx->data);
983 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
985 dev_info(&intf->dev, "bind() failure\n");
988 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
990 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
992 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
993 struct usb_driver *driver = driver_of(intf);
996 return; /* no setup */
998 atomic_set(&ctx->stop, 1);
1000 hrtimer_cancel(&ctx->tx_timer);
1002 tasklet_kill(&ctx->bh);
1004 /* handle devices with combined control and data interface */
1005 if (ctx->control == ctx->data)
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);
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;
1020 usb_set_intfdata(intf, NULL);
1023 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
1025 /* Return the number of the MBIM control interface altsetting iff it
1026 * is preferred and available,
1028 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1030 struct usb_host_interface *alt;
1032 /* The MBIM spec defines a NCM compatible default altsetting,
1033 * which we may have matched:
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
1047 if (intf->num_altsetting < 2)
1048 return intf->cur_altsetting->desc.bAlternateSetting;
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;
1055 return CDC_NCM_COMM_ALTSETTING_NCM;
1057 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1059 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1061 /* MBIM backwards compatible function? */
1062 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1065 /* The NCM data altsetting is fixed, so we hard-coded it.
1066 * Additionally, generic NCM devices are assumed to accept arbitrarily
1069 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1072 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1074 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1076 if (skb->len + align > max)
1077 align = max - skb->len;
1078 if (align && skb_tailroom(skb) >= align)
1079 skb_put_zero(skb, align);
1082 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1083 * allocating a new one within skb
1085 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
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);
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.
1095 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1096 if (ctx->delayed_ndp16->dwSignature == sign)
1097 return ctx->delayed_ndp16;
1099 /* We can only push a single NDP to the end. Return
1100 * NULL to send what we've already got and queue this
1103 else if (ctx->delayed_ndp16->dwSignature)
1107 /* follow the chain of NDPs, looking for a match */
1109 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1110 if (ndp16->dwSignature == sign)
1112 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
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);
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)
1125 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1127 nth16->wNdpIndex = cpu_to_le16(skb->len);
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);
1133 ndp16 = ctx->delayed_ndp16;
1135 ndp16->dwSignature = sign;
1136 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1140 static struct usb_cdc_ncm_ndp32 *cdc_ncm_ndp32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
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);
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.
1150 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1151 if (ctx->delayed_ndp32->dwSignature == sign)
1152 return ctx->delayed_ndp32;
1154 /* We can only push a single NDP to the end. Return
1155 * NULL to send what we've already got and queue this
1158 else if (ctx->delayed_ndp32->dwSignature)
1162 /* follow the chain of NDPs, looking for a match */
1164 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb->data + ndpoffset);
1165 if (ndp32->dwSignature == sign)
1167 ndpoffset = le32_to_cpu(ndp32->dwNextNdpIndex);
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);
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)
1180 ndp32->dwNextNdpIndex = cpu_to_le32(skb->len);
1182 nth32->dwNdpIndex = cpu_to_le32(skb->len);
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);
1188 ndp32 = ctx->delayed_ndp32;
1190 ndp32->dwSignature = sign;
1191 ndp32->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32));
1196 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1198 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1200 struct usb_cdc_ncm_nth16 *nth16;
1201 struct usb_cdc_ncm_nth32 *nth32;
1204 struct usb_cdc_ncm_ndp16 *ndp16;
1205 struct usb_cdc_ncm_ndp32 *ndp32;
1207 struct sk_buff *skb_out;
1208 u16 n = 0, index, ndplen;
1210 u32 delayed_ndp_size;
1211 size_t padding_count;
1213 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1214 * accordingly. Otherwise, we should check here.
1216 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1217 delayed_ndp_size = ctx->max_ndp_size +
1219 ctx->tx_ndp_modulus,
1220 ctx->tx_modulus + ctx->tx_remainder) - 1;
1222 delayed_ndp_size = 0;
1224 /* if there is a remaining skb, it gets priority */
1226 swap(skb, ctx->tx_rem_skb);
1227 swap(sign, ctx->tx_rem_sign);
1232 /* check if we are resuming an OUT skb */
1233 skb_out = ctx->tx_curr_skb;
1235 /* allocate a new OUT skb */
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
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;
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.
1257 ctx->tx_curr_size = max(skb->len,
1258 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1260 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1261 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1263 /* No allocation possible so we will abort */
1264 if (skb_out == NULL) {
1266 dev_kfree_skb_any(skb);
1267 dev->net->stats.tx_dropped++;
1271 ctx->tx_low_mem_val--;
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++);
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++);
1287 /* count total number of frames in this NTB */
1288 ctx->tx_curr_frame_num = 0;
1290 /* recent payload counter for this skb_out */
1291 ctx->tx_curr_frame_payload = 0;
1294 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1295 /* send any remaining skb first */
1297 skb = ctx->tx_rem_skb;
1298 sign = ctx->tx_rem_sign;
1299 ctx->tx_rem_skb = NULL;
1301 /* check for end of skb */
1306 /* get the appropriate NDP for this skb */
1308 ndp.ndp16 = cdc_ncm_ndp16(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1310 ndp.ndp32 = cdc_ncm_ndp32(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1312 /* align beginning of next frame */
1313 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
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) {
1319 /* won't fit, MTU problem? */
1320 dev_kfree_skb_any(skb);
1322 dev->net->stats.tx_dropped++;
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++;
1329 ctx->tx_rem_skb = skb;
1330 ctx->tx_rem_sign = sign;
1333 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
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;
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));
1348 ndplen = le16_to_cpu(ndp.ndp32->wLength);
1349 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp32)) / sizeof(struct usb_cdc_ncm_dpe32) - 1;
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));
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);
1360 /* send now if this NDP is full */
1361 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1363 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1368 /* free up any dangling skb */
1370 dev_kfree_skb_any(skb);
1372 dev->net->stats.tx_dropped++;
1375 ctx->tx_curr_frame_num = n;
1378 /* wait for more frames */
1379 /* push variables */
1380 ctx->tx_curr_skb = skb_out;
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;
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 */
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);
1407 /* Zero out delayed NDP - signature checking will naturally fail. */
1408 ndp.ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
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);
1415 ndp.ndp32 = memset(ctx->delayed_ndp32, 0, ctx->max_ndp_size);
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.
1425 * This optimization support is pointless if we end up sending
1426 * a ZLP after full sized NTBs.
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 */
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);
1443 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data;
1444 nth.nth32->dwBlockLength = cpu_to_le32(skb_out->len);
1448 ctx->tx_curr_skb = NULL;
1450 /* keep private stats: framing overhead and number of NTBs */
1451 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
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.
1458 usbnet_set_skb_tx_stats(skb_out, n,
1459 (long)ctx->tx_curr_frame_payload - skb_out->len);
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);
1469 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1471 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
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,
1480 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1482 struct cdc_ncm_ctx *ctx =
1483 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1485 if (!atomic_read(&ctx->stop))
1486 tasklet_schedule(&ctx->bh);
1487 return HRTIMER_NORESTART;
1490 static void cdc_ncm_txpath_bh(struct tasklet_struct *t)
1492 struct cdc_ncm_ctx *ctx = from_tasklet(ctx, t, bh);
1493 struct usbnet *dev = ctx->dev;
1495 spin_lock_bh(&ctx->mtx);
1496 if (ctx->tx_timer_pending != 0) {
1497 ctx->tx_timer_pending--;
1498 cdc_ncm_tx_timeout_start(ctx);
1499 spin_unlock_bh(&ctx->mtx);
1500 } else if (dev->net != NULL) {
1501 ctx->tx_reason_timeout++; /* count reason for transmitting */
1502 spin_unlock_bh(&ctx->mtx);
1503 netif_tx_lock_bh(dev->net);
1504 usbnet_start_xmit(NULL, dev->net);
1505 netif_tx_unlock_bh(dev->net);
1507 spin_unlock_bh(&ctx->mtx);
1512 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1514 struct sk_buff *skb_out;
1515 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
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
1527 spin_lock_bh(&ctx->mtx);
1530 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1532 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN));
1534 spin_unlock_bh(&ctx->mtx);
1539 dev_kfree_skb_any(skb);
1543 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
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)
1548 struct usbnet *dev = netdev_priv(skb_in->dev);
1549 struct usb_cdc_ncm_nth16 *nth16;
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");
1562 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
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));
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,
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));
1586 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1588 ret = le16_to_cpu(nth16->wNdpIndex);
1592 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1594 int cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1596 struct usbnet *dev = netdev_priv(skb_in->dev);
1597 struct usb_cdc_ncm_nth32 *nth32;
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");
1610 nth32 = (struct usb_cdc_ncm_nth32 *)skb_in->data;
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));
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,
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));
1634 ctx->rx_seq = le16_to_cpu(nth32->wSequence);
1636 ret = le32_to_cpu(nth32->dwNdpIndex);
1640 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth32);
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)
1645 struct usbnet *dev = netdev_priv(skb_in->dev);
1646 struct usb_cdc_ncm_ndp16 *ndp16;
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",
1654 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
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));
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 */
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);
1676 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
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)
1681 struct usbnet *dev = netdev_priv(skb_in->dev);
1682 struct usb_cdc_ncm_ndp32 *ndp32;
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",
1690 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
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));
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 */
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);
1712 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp32);
1714 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1716 struct sk_buff *skb;
1717 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1721 unsigned int offset;
1723 struct usb_cdc_ncm_ndp16 *ndp16;
1724 struct usb_cdc_ncm_ndp32 *ndp32;
1727 struct usb_cdc_ncm_dpe16 *dpe16;
1728 struct usb_cdc_ncm_dpe32 *dpe32;
1732 int loopcount = 50; /* arbitrary max preventing infinite loop */
1736 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1738 ndpoffset = cdc_ncm_rx_verify_nth32(ctx, skb_in);
1744 if (ctx->is_ndp16) {
1745 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1749 ndp.ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
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));
1757 dpe.dpe16 = ndp.ndp16->dpe16;
1759 nframes = cdc_ncm_rx_verify_ndp32(skb_in, ndpoffset);
1763 ndp.ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset);
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));
1771 dpe.dpe32 = ndp.ndp32->dpe32;
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);
1779 offset = le32_to_cpu(dpe.dpe32->dwDatagramIndex);
1780 len = le32_to_cpu(dpe.dpe32->dwDatagramLength);
1785 * All entries after first NULL entry are to be ignored
1787 if ((offset == 0) || (len == 0)) {
1789 goto err_ndp; /* empty NTB */
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);
1804 /* create a fresh copy to reduce truesize */
1805 skb = netdev_alloc_skb_ip_align(dev->net, len);
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 */
1819 /* are there more NDPs to process? */
1821 ndpoffset = le16_to_cpu(ndp.ndp16->wNextNdpIndex);
1823 ndpoffset = le32_to_cpu(ndp.ndp32->dwNextNdpIndex);
1825 if (ndpoffset && loopcount--)
1829 ctx->rx_overhead += skb_in->len - payload;
1836 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1839 cdc_ncm_speed_change(struct usbnet *dev,
1840 struct usb_cdc_speed_change *data)
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);
1847 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1849 struct usb_cdc_notification *event;
1851 if (urb->actual_length < sizeof(*event))
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);
1861 event = urb->transfer_buffer;
1863 switch (event->bNotificationType) {
1864 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
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.
1870 /* RTL8156 shipped before 2021 sends notification about
1871 * every 32ms. Don't forward notification if state is same.
1873 if (netif_carrier_ok(dev->net) != !!event->wValue)
1874 usbnet_link_change(dev, !!event->wValue, 0);
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);
1882 cdc_ncm_speed_change(dev,
1883 (struct usb_cdc_speed_change *)&event[1]);
1887 dev_dbg(&dev->udev->dev,
1888 "NCM: unexpected notification 0x%02x!\n",
1889 event->bNotificationType);
1894 static const struct driver_info cdc_ncm_info = {
1895 .description = "CDC NCM",
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,
1907 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1908 static const struct driver_info wwan_info = {
1909 .description = "Mobile Broadband Network Device",
1910 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1911 | FLAG_LINK_INTR | FLAG_WWAN,
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 .set_rx_mode = usbnet_cdc_update_filter,
1921 /* Same as wwan_info, but with FLAG_NOARP */
1922 static const struct driver_info wwan_noarp_info = {
1923 .description = "Mobile Broadband Network Device (NO ARP)",
1924 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1925 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1926 .bind = cdc_ncm_bind,
1927 .unbind = cdc_ncm_unbind,
1928 .manage_power = usbnet_manage_power,
1929 .status = cdc_ncm_status,
1930 .rx_fixup = cdc_ncm_rx_fixup,
1931 .tx_fixup = cdc_ncm_tx_fixup,
1932 .set_rx_mode = usbnet_cdc_update_filter,
1935 static const struct usb_device_id cdc_devs[] = {
1936 /* Ericsson MBM devices like F5521gw */
1937 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1938 | USB_DEVICE_ID_MATCH_VENDOR,
1940 .bInterfaceClass = USB_CLASS_COMM,
1941 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1942 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1943 .driver_info = (unsigned long) &wwan_info,
1946 /* Telit LE910 V2 */
1947 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1949 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1950 .driver_info = (unsigned long)&wwan_noarp_info,
1953 /* DW5812 LTE Verizon Mobile Broadband Card
1954 * Unlike DW5550 this device requires FLAG_NOARP
1956 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1958 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1959 .driver_info = (unsigned long)&wwan_noarp_info,
1962 /* DW5813 LTE AT&T Mobile Broadband Card
1963 * Unlike DW5550 this device requires FLAG_NOARP
1965 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1967 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1968 .driver_info = (unsigned long)&wwan_noarp_info,
1971 /* Dell branded MBM devices like DW5550 */
1972 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1973 | USB_DEVICE_ID_MATCH_VENDOR,
1975 .bInterfaceClass = USB_CLASS_COMM,
1976 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1977 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1978 .driver_info = (unsigned long) &wwan_info,
1981 /* Toshiba branded MBM devices */
1982 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1983 | USB_DEVICE_ID_MATCH_VENDOR,
1985 .bInterfaceClass = USB_CLASS_COMM,
1986 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1987 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1988 .driver_info = (unsigned long) &wwan_info,
1991 /* tag Huawei devices as wwan */
1992 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1994 USB_CDC_SUBCLASS_NCM,
1995 USB_CDC_PROTO_NONE),
1996 .driver_info = (unsigned long)&wwan_info,
1999 /* Infineon(now Intel) HSPA Modem platform */
2000 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
2002 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2003 .driver_info = (unsigned long)&wwan_noarp_info,
2006 /* u-blox TOBY-L4 */
2007 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
2009 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2010 .driver_info = (unsigned long)&wwan_info,
2013 /* Generic CDC-NCM devices */
2014 { USB_INTERFACE_INFO(USB_CLASS_COMM,
2015 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
2016 .driver_info = (unsigned long)&cdc_ncm_info,
2021 MODULE_DEVICE_TABLE(usb, cdc_devs);
2023 static struct usb_driver cdc_ncm_driver = {
2025 .id_table = cdc_devs,
2026 .probe = usbnet_probe,
2027 .disconnect = usbnet_disconnect,
2028 .suspend = usbnet_suspend,
2029 .resume = usbnet_resume,
2030 .reset_resume = usbnet_resume,
2031 .supports_autosuspend = 1,
2032 .disable_hub_initiated_lpm = 1,
2035 module_usb_driver(cdc_ncm_driver);
2037 MODULE_AUTHOR("Hans Petter Selasky");
2038 MODULE_DESCRIPTION("USB CDC NCM host driver");
2039 MODULE_LICENSE("Dual BSD/GPL");