4 * Copyright (C) ST-Ericsson 2010-2012
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
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(unsigned long param);
65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
67 static struct usb_driver cdc_ncm_driver;
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,
146 .set_link_ksettings = usbnet_set_link_ksettings,
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 */
178 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
179 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
181 max = CDC_NCM_NTB_MAX_SIZE_TX; /* dwNtbOutMaxSize not set */
183 /* some devices set dwNtbOutMaxSize too low for the above default */
186 val = clamp_t(u32, new_tx, min, max);
188 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
193 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
195 struct usbnet *dev = netdev_priv(to_net_dev(d));
196 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
198 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
201 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
203 struct usbnet *dev = netdev_priv(to_net_dev(d));
204 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
206 return sprintf(buf, "%u\n", ctx->rx_max);
209 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
211 struct usbnet *dev = netdev_priv(to_net_dev(d));
212 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
214 return sprintf(buf, "%u\n", ctx->tx_max);
217 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
219 struct usbnet *dev = netdev_priv(to_net_dev(d));
220 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
222 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
225 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
227 struct usbnet *dev = netdev_priv(to_net_dev(d));
228 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
231 /* no need to restrict values - anything from 0 to infinity is OK */
232 if (kstrtoul(buf, 0, &val))
235 ctx->min_tx_pkt = val;
239 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
241 struct usbnet *dev = netdev_priv(to_net_dev(d));
242 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
245 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
248 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
252 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
254 struct usbnet *dev = netdev_priv(to_net_dev(d));
255 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
258 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
261 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
265 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
267 struct usbnet *dev = netdev_priv(to_net_dev(d));
268 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
272 ret = kstrtoul(buf, 0, &val);
275 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
278 spin_lock_bh(&ctx->mtx);
279 ctx->timer_interval = val * NSEC_PER_USEC;
280 if (!ctx->timer_interval)
281 ctx->tx_timer_pending = 0;
282 spin_unlock_bh(&ctx->mtx);
286 static DEVICE_ATTR(min_tx_pkt, 0644, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
287 static DEVICE_ATTR(rx_max, 0644, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
288 static DEVICE_ATTR(tx_max, 0644, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
289 static DEVICE_ATTR(tx_timer_usecs, 0644, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
291 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
293 struct usbnet *dev = netdev_priv(to_net_dev(d));
294 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
296 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
299 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
301 struct usbnet *dev = netdev_priv(to_net_dev(d));
302 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
305 if (strtobool(buf, &enable))
309 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
312 if (enable && !ctx->delayed_ndp16) {
313 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
314 if (!ctx->delayed_ndp16)
318 /* flush pending data before changing flag */
319 netif_tx_lock_bh(dev->net);
320 usbnet_start_xmit(NULL, dev->net);
321 spin_lock_bh(&ctx->mtx);
323 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
325 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
326 spin_unlock_bh(&ctx->mtx);
327 netif_tx_unlock_bh(dev->net);
331 static DEVICE_ATTR_RW(ndp_to_end);
333 #define NCM_PARM_ATTR(name, format, tocpu) \
334 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
336 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
337 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
338 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
340 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
342 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
343 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
344 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
345 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
346 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
347 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
348 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
349 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
350 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
351 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
353 static struct attribute *cdc_ncm_sysfs_attrs[] = {
354 &dev_attr_min_tx_pkt.attr,
355 &dev_attr_ndp_to_end.attr,
356 &dev_attr_rx_max.attr,
357 &dev_attr_tx_max.attr,
358 &dev_attr_tx_timer_usecs.attr,
359 &dev_attr_bmNtbFormatsSupported.attr,
360 &dev_attr_dwNtbInMaxSize.attr,
361 &dev_attr_wNdpInDivisor.attr,
362 &dev_attr_wNdpInPayloadRemainder.attr,
363 &dev_attr_wNdpInAlignment.attr,
364 &dev_attr_dwNtbOutMaxSize.attr,
365 &dev_attr_wNdpOutDivisor.attr,
366 &dev_attr_wNdpOutPayloadRemainder.attr,
367 &dev_attr_wNdpOutAlignment.attr,
368 &dev_attr_wNtbOutMaxDatagrams.attr,
372 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
374 .attrs = cdc_ncm_sysfs_attrs,
377 /* handle rx_max and tx_max changes */
378 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
380 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
381 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
384 val = cdc_ncm_check_rx_max(dev, new_rx);
386 /* inform device about NTB input size changes */
387 if (val != ctx->rx_max) {
388 __le32 dwNtbInMaxSize = cpu_to_le32(val);
390 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
392 /* tell device to use new size */
393 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
394 USB_TYPE_CLASS | USB_DIR_OUT
395 | USB_RECIP_INTERFACE,
396 0, iface_no, &dwNtbInMaxSize, 4) < 0)
397 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
402 /* usbnet use these values for sizing rx queues */
403 if (dev->rx_urb_size != ctx->rx_max) {
404 dev->rx_urb_size = ctx->rx_max;
405 if (netif_running(dev->net))
406 usbnet_unlink_rx_urbs(dev);
409 val = cdc_ncm_check_tx_max(dev, new_tx);
410 if (val != ctx->tx_max)
411 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
413 /* Adding a pad byte here if necessary simplifies the handling
414 * in cdc_ncm_fill_tx_frame, making tx_max always represent
415 * the real skb max size.
417 * We cannot use dev->maxpacket here because this is called from
418 * .bind which is called before usbnet sets up dev->maxpacket
420 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
421 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
424 /* we might need to flush any pending tx buffers if running */
425 if (netif_running(dev->net) && val > ctx->tx_max) {
426 netif_tx_lock_bh(dev->net);
427 usbnet_start_xmit(NULL, dev->net);
428 /* make sure tx_curr_skb is reallocated if it was empty */
429 if (ctx->tx_curr_skb) {
430 dev_kfree_skb_any(ctx->tx_curr_skb);
431 ctx->tx_curr_skb = NULL;
434 netif_tx_unlock_bh(dev->net);
439 dev->hard_mtu = ctx->tx_max;
441 /* max qlen depend on hard_mtu and rx_urb_size */
442 usbnet_update_max_qlen(dev);
444 /* never pad more than 3 full USB packets per transfer */
445 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
446 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
449 /* helpers for NCM and MBIM differences */
450 static u8 cdc_ncm_flags(struct usbnet *dev)
452 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
454 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
455 return ctx->mbim_desc->bmNetworkCapabilities;
457 return ctx->func_desc->bmNetworkCapabilities;
461 static int cdc_ncm_eth_hlen(struct usbnet *dev)
463 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
468 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
470 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
471 return CDC_MBIM_MIN_DATAGRAM_SIZE;
472 return CDC_NCM_MIN_DATAGRAM_SIZE;
475 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
477 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
479 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
480 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
482 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
483 return CDC_NCM_MAX_DATAGRAM_SIZE;
486 /* initial one-time device setup. MUST be called with the data interface
489 static int cdc_ncm_init(struct usbnet *dev)
491 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
492 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
495 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
496 USB_TYPE_CLASS | USB_DIR_IN
497 |USB_RECIP_INTERFACE,
498 0, iface_no, &ctx->ncm_parm,
499 sizeof(ctx->ncm_parm));
501 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
502 return err; /* GET_NTB_PARAMETERS is required */
506 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
507 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
508 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
509 USB_TYPE_CLASS | USB_DIR_OUT
510 | USB_RECIP_INTERFACE,
511 USB_CDC_NCM_CRC_NOT_APPENDED,
514 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
517 /* set NTB format, if both formats are supported.
519 * "The host shall only send this command while the NCM Data
520 * Interface is in alternate setting 0."
522 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
523 USB_CDC_NCM_NTB32_SUPPORTED) {
524 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
525 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
526 USB_TYPE_CLASS | USB_DIR_OUT
527 | USB_RECIP_INTERFACE,
528 USB_CDC_NCM_NTB16_FORMAT,
531 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
534 /* set initial device values */
535 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
536 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
537 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
538 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
539 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
540 /* devices prior to NCM Errata shall set this field to zero */
541 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
543 dev_dbg(&dev->intf->dev,
544 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
545 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
546 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
548 /* max count of tx datagrams */
549 if ((ctx->tx_max_datagrams == 0) ||
550 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
551 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
553 /* set up maximum NDP size */
554 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
556 /* initial coalescing timer interval */
557 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
562 /* set a new max datagram size */
563 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
565 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
566 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
567 __le16 max_datagram_size;
571 /* set default based on descriptors */
572 ctx->max_datagram_size = clamp_t(u32, new_size,
573 cdc_ncm_min_dgram_size(dev),
574 CDC_NCM_MAX_DATAGRAM_SIZE);
576 /* inform the device about the selected Max Datagram Size? */
577 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
580 /* read current mtu value from device */
581 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
582 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
583 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
584 if (err != sizeof(max_datagram_size)) {
585 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
589 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
592 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
593 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
594 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
595 0, iface_no, &max_datagram_size, sizeof(max_datagram_size));
597 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
600 /* set MTU to max supported by the device if necessary */
601 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
603 /* do not exceed operater preferred MTU */
604 if (ctx->mbim_extended_desc) {
605 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
606 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
607 dev->net->mtu = mbim_mtu;
611 static void cdc_ncm_fix_modulus(struct usbnet *dev)
613 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
617 * verify that the structure alignment is:
619 * - not greater than the maximum transmit length
620 * - not less than four bytes
622 val = ctx->tx_ndp_modulus;
624 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
625 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
626 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
627 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
631 * verify that the payload alignment is:
633 * - not greater than the maximum transmit length
634 * - not less than four bytes
636 val = ctx->tx_modulus;
638 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
639 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
640 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
641 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
644 /* verify the payload remainder */
645 if (ctx->tx_remainder >= ctx->tx_modulus) {
646 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
647 ctx->tx_remainder = 0;
650 /* adjust TX-remainder according to NCM specification. */
651 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
652 (ctx->tx_modulus - 1));
655 static int cdc_ncm_setup(struct usbnet *dev)
657 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
660 /* be conservative when selecting intial buffer size to
661 * increase the number of hosts this will work for
663 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
664 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
665 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
666 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
668 /* clamp rx_max and tx_max and inform device */
669 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
671 /* sanitize the modulus and remainder values */
672 cdc_ncm_fix_modulus(dev);
674 /* set max datagram size */
675 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
680 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
682 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
685 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
686 e = intf->cur_altsetting->endpoint + ep;
688 /* ignore endpoints which cannot transfer data */
689 if (!usb_endpoint_maxp(&e->desc))
692 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
693 case USB_ENDPOINT_XFER_INT:
694 if (usb_endpoint_dir_in(&e->desc)) {
700 case USB_ENDPOINT_XFER_BULK:
701 if (usb_endpoint_dir_in(&e->desc)) {
715 dev->in = usb_rcvbulkpipe(dev->udev,
716 in->desc.bEndpointAddress &
717 USB_ENDPOINT_NUMBER_MASK);
718 if (out && !dev->out)
719 dev->out = usb_sndbulkpipe(dev->udev,
720 out->desc.bEndpointAddress &
721 USB_ENDPOINT_NUMBER_MASK);
724 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
729 if (ctx->tx_rem_skb != NULL) {
730 dev_kfree_skb_any(ctx->tx_rem_skb);
731 ctx->tx_rem_skb = NULL;
734 if (ctx->tx_curr_skb != NULL) {
735 dev_kfree_skb_any(ctx->tx_curr_skb);
736 ctx->tx_curr_skb = NULL;
739 kfree(ctx->delayed_ndp16);
744 /* we need to override the usbnet change_mtu ndo for two reasons:
745 * - respect the negotiated maximum datagram size
746 * - avoid unwanted changes to rx and tx buffers
748 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
750 struct usbnet *dev = netdev_priv(net);
753 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
757 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
759 static const struct net_device_ops cdc_ncm_netdev_ops = {
760 .ndo_open = usbnet_open,
761 .ndo_stop = usbnet_stop,
762 .ndo_start_xmit = usbnet_start_xmit,
763 .ndo_tx_timeout = usbnet_tx_timeout,
764 .ndo_get_stats64 = usbnet_get_stats64,
765 .ndo_change_mtu = cdc_ncm_change_mtu,
766 .ndo_set_mac_address = eth_mac_addr,
767 .ndo_validate_addr = eth_validate_addr,
770 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
772 struct cdc_ncm_ctx *ctx;
773 struct usb_driver *driver;
779 struct usb_cdc_parsed_header hdr;
780 __le16 curr_ntb_format;
782 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
786 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
787 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
788 ctx->bh.data = (unsigned long)dev;
789 ctx->bh.func = cdc_ncm_txpath_bh;
790 atomic_set(&ctx->stop, 0);
791 spin_lock_init(&ctx->mtx);
793 /* store ctx pointer in device data field */
794 dev->data[0] = (unsigned long)ctx;
796 /* only the control interface can be successfully probed */
799 /* get some pointers */
800 driver = driver_of(intf);
801 buf = intf->cur_altsetting->extra;
802 len = intf->cur_altsetting->extralen;
804 /* parse through descriptors associated with control interface */
805 cdc_parse_cdc_header(&hdr, intf, buf, len);
807 if (hdr.usb_cdc_union_desc)
808 ctx->data = usb_ifnum_to_if(dev->udev,
809 hdr.usb_cdc_union_desc->bSlaveInterface0);
810 ctx->ether_desc = hdr.usb_cdc_ether_desc;
811 ctx->func_desc = hdr.usb_cdc_ncm_desc;
812 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
813 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
815 /* some buggy devices have an IAD but no CDC Union */
816 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
817 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
818 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
821 /* check if we got everything */
823 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
826 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
827 if (!ctx->mbim_desc) {
828 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
832 if (!ctx->ether_desc || !ctx->func_desc) {
833 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
838 /* claim data interface, if different from control */
839 if (ctx->data != ctx->control) {
840 temp = usb_driver_claim_interface(driver, ctx->data, dev);
842 dev_dbg(&intf->dev, "failed to claim data intf\n");
847 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
849 /* Device-specific flags */
850 ctx->drvflags = drvflags;
852 /* Reset data interface. Some devices will not reset properly
853 * unless they are configured first. Toggle the altsetting to
855 * Some other devices do not work properly with this procedure
856 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
858 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
859 usb_set_interface(dev->udev, iface_no, data_altsetting);
861 temp = usb_set_interface(dev->udev, iface_no, 0);
863 dev_dbg(&intf->dev, "set interface failed\n");
867 /* initialize basic device settings */
868 if (cdc_ncm_init(dev))
871 /* Some firmwares need a pause here or they will silently fail
872 * to set up the interface properly. This value was decided
873 * empirically on a Sierra Wireless MC7455 running 02.08.02.00
876 usleep_range(10000, 20000);
878 /* configure data interface */
879 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
881 dev_dbg(&intf->dev, "set interface failed\n");
886 * Some Huawei devices have been observed to come out of reset in NDP32 mode.
887 * Let's check if this is the case, and set the device to NDP16 mode again if
890 if (ctx->drvflags & CDC_NCM_FLAG_RESET_NTB16) {
891 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_FORMAT,
892 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
893 0, iface_no, &curr_ntb_format, 2);
898 if (curr_ntb_format == cpu_to_le16(USB_CDC_NCM_NTB32_FORMAT)) {
899 dev_info(&intf->dev, "resetting NTB format to 16-bit");
900 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
901 USB_TYPE_CLASS | USB_DIR_OUT
902 | USB_RECIP_INTERFACE,
903 USB_CDC_NCM_NTB16_FORMAT,
911 cdc_ncm_find_endpoints(dev, ctx->data);
912 cdc_ncm_find_endpoints(dev, ctx->control);
913 if (!dev->in || !dev->out || !dev->status) {
914 dev_dbg(&intf->dev, "failed to collect endpoints\n");
918 usb_set_intfdata(ctx->data, dev);
919 usb_set_intfdata(ctx->control, dev);
921 if (ctx->ether_desc) {
922 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
924 dev_dbg(&intf->dev, "failed to get mac address\n");
927 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
930 /* finish setting up the device specific data */
933 /* Allocate the delayed NDP if needed. */
934 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
935 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
936 if (!ctx->delayed_ndp16)
938 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
941 /* override ethtool_ops */
942 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
944 /* add our sysfs attrs */
945 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
947 /* must handle MTU changes */
948 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
949 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
954 usb_set_intfdata(ctx->control, NULL);
955 usb_set_intfdata(ctx->data, NULL);
956 if (ctx->data != ctx->control)
957 usb_driver_release_interface(driver, ctx->data);
959 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
961 dev_info(&intf->dev, "bind() failure\n");
964 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
966 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
968 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
969 struct usb_driver *driver = driver_of(intf);
972 return; /* no setup */
974 atomic_set(&ctx->stop, 1);
976 hrtimer_cancel(&ctx->tx_timer);
978 tasklet_kill(&ctx->bh);
980 /* handle devices with combined control and data interface */
981 if (ctx->control == ctx->data)
984 /* disconnect master --> disconnect slave */
985 if (intf == ctx->control && ctx->data) {
986 usb_set_intfdata(ctx->data, NULL);
987 usb_driver_release_interface(driver, ctx->data);
990 } else if (intf == ctx->data && ctx->control) {
991 usb_set_intfdata(ctx->control, NULL);
992 usb_driver_release_interface(driver, ctx->control);
996 usb_set_intfdata(intf, NULL);
999 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
1001 /* Return the number of the MBIM control interface altsetting iff it
1002 * is preferred and available,
1004 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1006 struct usb_host_interface *alt;
1008 /* The MBIM spec defines a NCM compatible default altsetting,
1009 * which we may have matched:
1011 * "Functions that implement both NCM 1.0 and MBIM (an
1012 * “NCM/MBIM function”) according to this recommendation
1013 * shall provide two alternate settings for the
1014 * Communication Interface. Alternate setting 0, and the
1015 * associated class and endpoint descriptors, shall be
1016 * constructed according to the rules given for the
1017 * Communication Interface in section 5 of [USBNCM10].
1018 * Alternate setting 1, and the associated class and
1019 * endpoint descriptors, shall be constructed according to
1020 * the rules given in section 6 (USB Device Model) of this
1023 if (intf->num_altsetting < 2)
1024 return intf->cur_altsetting->desc.bAlternateSetting;
1027 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1028 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1029 return CDC_NCM_COMM_ALTSETTING_MBIM;
1031 return CDC_NCM_COMM_ALTSETTING_NCM;
1033 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1035 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1037 /* MBIM backwards compatible function? */
1038 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1041 /* The NCM data altsetting is fixed, so we hard-coded it.
1042 * Additionally, generic NCM devices are assumed to accept arbitrarily
1045 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1048 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1050 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1052 if (skb->len + align > max)
1053 align = max - skb->len;
1054 if (align && skb_tailroom(skb) >= align)
1055 skb_put_zero(skb, align);
1058 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1059 * allocating a new one within skb
1061 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1063 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1064 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1065 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1067 /* If NDP should be moved to the end of the NCM package, we can't follow the
1068 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1069 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1071 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1072 if (ctx->delayed_ndp16->dwSignature == sign)
1073 return ctx->delayed_ndp16;
1075 /* We can only push a single NDP to the end. Return
1076 * NULL to send what we've already got and queue this
1079 else if (ctx->delayed_ndp16->dwSignature)
1083 /* follow the chain of NDPs, looking for a match */
1085 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1086 if (ndp16->dwSignature == sign)
1088 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1092 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1093 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1095 /* verify that there is room for the NDP and the datagram (reserve) */
1096 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1101 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1103 nth16->wNdpIndex = cpu_to_le16(skb->len);
1105 /* push a new empty NDP */
1106 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1107 ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1109 ndp16 = ctx->delayed_ndp16;
1111 ndp16->dwSignature = sign;
1112 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1117 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1119 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1120 struct usb_cdc_ncm_nth16 *nth16;
1121 struct usb_cdc_ncm_ndp16 *ndp16;
1122 struct sk_buff *skb_out;
1123 u16 n = 0, index, ndplen;
1125 u32 delayed_ndp_size;
1126 size_t padding_count;
1128 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1129 * accordingly. Otherwise, we should check here.
1131 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1132 delayed_ndp_size = ctx->max_ndp_size +
1134 ctx->tx_ndp_modulus,
1135 ctx->tx_modulus + ctx->tx_remainder) - 1;
1137 delayed_ndp_size = 0;
1139 /* if there is a remaining skb, it gets priority */
1141 swap(skb, ctx->tx_rem_skb);
1142 swap(sign, ctx->tx_rem_sign);
1147 /* check if we are resuming an OUT skb */
1148 skb_out = ctx->tx_curr_skb;
1150 /* allocate a new OUT skb */
1152 if (ctx->tx_low_mem_val == 0) {
1153 ctx->tx_curr_size = ctx->tx_max;
1154 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1155 /* If the memory allocation fails we will wait longer
1156 * each time before attempting another full size
1157 * allocation again to not overload the system
1160 if (skb_out == NULL) {
1161 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1162 (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1163 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1166 if (skb_out == NULL) {
1167 /* See if a very small allocation is possible.
1168 * We will send this packet immediately and hope
1169 * that there is more memory available later.
1172 ctx->tx_curr_size = max(skb->len,
1173 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1175 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1176 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1178 /* No allocation possible so we will abort */
1179 if (skb_out == NULL) {
1181 dev_kfree_skb_any(skb);
1182 dev->net->stats.tx_dropped++;
1186 ctx->tx_low_mem_val--;
1188 /* fill out the initial 16-bit NTB header */
1189 nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1190 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1191 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1192 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1194 /* count total number of frames in this NTB */
1195 ctx->tx_curr_frame_num = 0;
1197 /* recent payload counter for this skb_out */
1198 ctx->tx_curr_frame_payload = 0;
1201 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1202 /* send any remaining skb first */
1204 skb = ctx->tx_rem_skb;
1205 sign = ctx->tx_rem_sign;
1206 ctx->tx_rem_skb = NULL;
1208 /* check for end of skb */
1213 /* get the appropriate NDP for this skb */
1214 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1216 /* align beginning of next frame */
1217 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1219 /* check if we had enough room left for both NDP and frame */
1220 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1222 /* won't fit, MTU problem? */
1223 dev_kfree_skb_any(skb);
1225 dev->net->stats.tx_dropped++;
1227 /* no room for skb - store for later */
1228 if (ctx->tx_rem_skb != NULL) {
1229 dev_kfree_skb_any(ctx->tx_rem_skb);
1230 dev->net->stats.tx_dropped++;
1232 ctx->tx_rem_skb = skb;
1233 ctx->tx_rem_sign = sign;
1236 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1241 /* calculate frame number withing this NDP */
1242 ndplen = le16_to_cpu(ndp16->wLength);
1243 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1245 /* OK, add this skb */
1246 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1247 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1248 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1249 skb_put_data(skb_out, skb->data, skb->len);
1250 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1251 dev_kfree_skb_any(skb);
1254 /* send now if this NDP is full */
1255 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1257 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1262 /* free up any dangling skb */
1264 dev_kfree_skb_any(skb);
1266 dev->net->stats.tx_dropped++;
1269 ctx->tx_curr_frame_num = n;
1272 /* wait for more frames */
1273 /* push variables */
1274 ctx->tx_curr_skb = skb_out;
1277 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1278 /* wait for more frames */
1279 /* push variables */
1280 ctx->tx_curr_skb = skb_out;
1281 /* set the pending count */
1282 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1283 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1287 if (n == ctx->tx_max_datagrams)
1288 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1289 /* frame goes out */
1290 /* variables will be reset at next call */
1293 /* If requested, put NDP at end of frame. */
1294 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1295 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1296 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1297 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1298 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1300 /* Zero out delayed NDP - signature checking will naturally fail. */
1301 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1304 /* If collected data size is less or equal ctx->min_tx_pkt
1305 * bytes, we send buffers as it is. If we get more data, it
1306 * would be more efficient for USB HS mobile device with DMA
1307 * engine to receive a full size NTB, than canceling DMA
1308 * transfer and receiving a short packet.
1310 * This optimization support is pointless if we end up sending
1311 * a ZLP after full sized NTBs.
1313 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1314 skb_out->len > ctx->min_tx_pkt) {
1315 padding_count = ctx->tx_curr_size - skb_out->len;
1316 if (!WARN_ON(padding_count > ctx->tx_curr_size))
1317 skb_put_zero(skb_out, padding_count);
1318 } else if (skb_out->len < ctx->tx_curr_size &&
1319 (skb_out->len % dev->maxpacket) == 0) {
1320 skb_put_u8(skb_out, 0); /* force short packet */
1323 /* set final frame length */
1324 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1325 nth16->wBlockLength = cpu_to_le16(skb_out->len);
1328 ctx->tx_curr_skb = NULL;
1330 /* keep private stats: framing overhead and number of NTBs */
1331 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1334 /* usbnet will count all the framing overhead by default.
1335 * Adjust the stats so that the tx_bytes counter show real
1336 * payload data instead.
1338 usbnet_set_skb_tx_stats(skb_out, n,
1339 (long)ctx->tx_curr_frame_payload - skb_out->len);
1344 /* Start timer, if there is a remaining non-empty skb */
1345 if (ctx->tx_curr_skb != NULL && n > 0)
1346 cdc_ncm_tx_timeout_start(ctx);
1349 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1351 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1353 /* start timer, if not already started */
1354 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1355 hrtimer_start(&ctx->tx_timer,
1356 ctx->timer_interval,
1360 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1362 struct cdc_ncm_ctx *ctx =
1363 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1365 if (!atomic_read(&ctx->stop))
1366 tasklet_schedule(&ctx->bh);
1367 return HRTIMER_NORESTART;
1370 static void cdc_ncm_txpath_bh(unsigned long param)
1372 struct usbnet *dev = (struct usbnet *)param;
1373 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1375 spin_lock_bh(&ctx->mtx);
1376 if (ctx->tx_timer_pending != 0) {
1377 ctx->tx_timer_pending--;
1378 cdc_ncm_tx_timeout_start(ctx);
1379 spin_unlock_bh(&ctx->mtx);
1380 } else if (dev->net != NULL) {
1381 ctx->tx_reason_timeout++; /* count reason for transmitting */
1382 spin_unlock_bh(&ctx->mtx);
1383 netif_tx_lock_bh(dev->net);
1384 usbnet_start_xmit(NULL, dev->net);
1385 netif_tx_unlock_bh(dev->net);
1387 spin_unlock_bh(&ctx->mtx);
1392 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1394 struct sk_buff *skb_out;
1395 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1398 * The Ethernet API we are using does not support transmitting
1399 * multiple Ethernet frames in a single call. This driver will
1400 * accumulate multiple Ethernet frames and send out a larger
1401 * USB frame when the USB buffer is full or when a single jiffies
1407 spin_lock_bh(&ctx->mtx);
1408 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1409 spin_unlock_bh(&ctx->mtx);
1414 dev_kfree_skb_any(skb);
1418 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1420 /* verify NTB header and return offset of first NDP, or negative error */
1421 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1423 struct usbnet *dev = netdev_priv(skb_in->dev);
1424 struct usb_cdc_ncm_nth16 *nth16;
1431 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1432 sizeof(struct usb_cdc_ncm_ndp16))) {
1433 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1437 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1439 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1440 netif_dbg(dev, rx_err, dev->net,
1441 "invalid NTH16 signature <%#010x>\n",
1442 le32_to_cpu(nth16->dwSignature));
1446 len = le16_to_cpu(nth16->wBlockLength);
1447 if (len > ctx->rx_max) {
1448 netif_dbg(dev, rx_err, dev->net,
1449 "unsupported NTB block length %u/%u\n", len,
1454 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1455 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1456 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1457 netif_dbg(dev, rx_err, dev->net,
1458 "sequence number glitch prev=%d curr=%d\n",
1459 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1461 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1463 ret = le16_to_cpu(nth16->wNdpIndex);
1467 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1469 /* verify NDP header and return number of datagrams, or negative error */
1470 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1472 struct usbnet *dev = netdev_priv(skb_in->dev);
1473 struct usb_cdc_ncm_ndp16 *ndp16;
1476 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1477 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1481 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1483 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1484 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1485 le16_to_cpu(ndp16->wLength));
1489 ret = ((le16_to_cpu(ndp16->wLength) -
1490 sizeof(struct usb_cdc_ncm_ndp16)) /
1491 sizeof(struct usb_cdc_ncm_dpe16));
1492 ret--; /* we process NDP entries except for the last one */
1494 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1495 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1496 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1503 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1505 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1507 struct sk_buff *skb;
1508 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1513 struct usb_cdc_ncm_ndp16 *ndp16;
1514 struct usb_cdc_ncm_dpe16 *dpe16;
1516 int loopcount = 50; /* arbitrary max preventing infinite loop */
1519 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1524 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1528 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1530 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1531 netif_dbg(dev, rx_err, dev->net,
1532 "invalid DPT16 signature <%#010x>\n",
1533 le32_to_cpu(ndp16->dwSignature));
1536 dpe16 = ndp16->dpe16;
1538 for (x = 0; x < nframes; x++, dpe16++) {
1539 offset = le16_to_cpu(dpe16->wDatagramIndex);
1540 len = le16_to_cpu(dpe16->wDatagramLength);
1544 * All entries after first NULL entry are to be ignored
1546 if ((offset == 0) || (len == 0)) {
1548 goto err_ndp; /* empty NTB */
1552 /* sanity checking */
1553 if (((offset + len) > skb_in->len) ||
1554 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1555 netif_dbg(dev, rx_err, dev->net,
1556 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1557 x, offset, len, skb_in);
1563 /* create a fresh copy to reduce truesize */
1564 skb = netdev_alloc_skb_ip_align(dev->net, len);
1567 skb_put_data(skb, skb_in->data + offset, len);
1568 usbnet_skb_return(dev, skb);
1569 payload += len; /* count payload bytes in this NTB */
1573 /* are there more NDPs to process? */
1574 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1575 if (ndpoffset && loopcount--)
1579 ctx->rx_overhead += skb_in->len - payload;
1586 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1589 cdc_ncm_speed_change(struct usbnet *dev,
1590 struct usb_cdc_speed_change *data)
1592 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1593 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1595 /* if the speed hasn't changed, don't report it.
1596 * RTL8156 shipped before 2021 sends notification about every 32ms.
1598 if (dev->rx_speed == rx_speed && dev->tx_speed == tx_speed)
1601 dev->rx_speed = rx_speed;
1602 dev->tx_speed = tx_speed;
1605 * Currently the USB-NET API does not support reporting the actual
1606 * device speed. Do print it instead.
1608 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1609 netif_info(dev, link, dev->net,
1610 "%u mbit/s downlink %u mbit/s uplink\n",
1611 (unsigned int)(rx_speed / 1000000U),
1612 (unsigned int)(tx_speed / 1000000U));
1614 netif_info(dev, link, dev->net,
1615 "%u kbit/s downlink %u kbit/s uplink\n",
1616 (unsigned int)(rx_speed / 1000U),
1617 (unsigned int)(tx_speed / 1000U));
1621 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1623 struct cdc_ncm_ctx *ctx;
1624 struct usb_cdc_notification *event;
1626 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1628 if (urb->actual_length < sizeof(*event))
1631 /* test for split data in 8-byte chunks */
1632 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1633 cdc_ncm_speed_change(dev,
1634 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1638 event = urb->transfer_buffer;
1640 switch (event->bNotificationType) {
1641 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1643 * According to the CDC NCM specification ch.7.1
1644 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1645 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1647 if (netif_carrier_ok(dev->net) != !!event->wValue)
1648 usbnet_link_change(dev, !!event->wValue, 0);
1651 case USB_CDC_NOTIFY_SPEED_CHANGE:
1652 if (urb->actual_length < (sizeof(*event) +
1653 sizeof(struct usb_cdc_speed_change)))
1654 set_bit(EVENT_STS_SPLIT, &dev->flags);
1656 cdc_ncm_speed_change(dev,
1657 (struct usb_cdc_speed_change *)&event[1]);
1661 dev_dbg(&dev->udev->dev,
1662 "NCM: unexpected notification 0x%02x!\n",
1663 event->bNotificationType);
1668 static const struct driver_info cdc_ncm_info = {
1669 .description = "CDC NCM",
1670 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1671 | FLAG_LINK_INTR | FLAG_ETHER,
1672 .bind = cdc_ncm_bind,
1673 .unbind = cdc_ncm_unbind,
1674 .manage_power = usbnet_manage_power,
1675 .status = cdc_ncm_status,
1676 .rx_fixup = cdc_ncm_rx_fixup,
1677 .tx_fixup = cdc_ncm_tx_fixup,
1680 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1681 static const struct driver_info wwan_info = {
1682 .description = "Mobile Broadband Network Device",
1683 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1684 | FLAG_LINK_INTR | FLAG_WWAN,
1685 .bind = cdc_ncm_bind,
1686 .unbind = cdc_ncm_unbind,
1687 .manage_power = usbnet_manage_power,
1688 .status = cdc_ncm_status,
1689 .rx_fixup = cdc_ncm_rx_fixup,
1690 .tx_fixup = cdc_ncm_tx_fixup,
1693 /* Same as wwan_info, but with FLAG_NOARP */
1694 static const struct driver_info wwan_noarp_info = {
1695 .description = "Mobile Broadband Network Device (NO ARP)",
1696 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1697 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1698 .bind = cdc_ncm_bind,
1699 .unbind = cdc_ncm_unbind,
1700 .manage_power = usbnet_manage_power,
1701 .status = cdc_ncm_status,
1702 .rx_fixup = cdc_ncm_rx_fixup,
1703 .tx_fixup = cdc_ncm_tx_fixup,
1706 static const struct usb_device_id cdc_devs[] = {
1707 /* Ericsson MBM devices like F5521gw */
1708 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1709 | USB_DEVICE_ID_MATCH_VENDOR,
1711 .bInterfaceClass = USB_CLASS_COMM,
1712 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1713 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1714 .driver_info = (unsigned long) &wwan_info,
1717 /* Telit LE910 V2 */
1718 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1720 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1721 .driver_info = (unsigned long)&wwan_noarp_info,
1724 /* DW5812 LTE Verizon Mobile Broadband Card
1725 * Unlike DW5550 this device requires FLAG_NOARP
1727 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1729 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1730 .driver_info = (unsigned long)&wwan_noarp_info,
1733 /* DW5813 LTE AT&T Mobile Broadband Card
1734 * Unlike DW5550 this device requires FLAG_NOARP
1736 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1738 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1739 .driver_info = (unsigned long)&wwan_noarp_info,
1742 /* Dell branded MBM devices like DW5550 */
1743 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1744 | USB_DEVICE_ID_MATCH_VENDOR,
1746 .bInterfaceClass = USB_CLASS_COMM,
1747 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1748 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1749 .driver_info = (unsigned long) &wwan_info,
1752 /* Toshiba branded MBM devices */
1753 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1754 | USB_DEVICE_ID_MATCH_VENDOR,
1756 .bInterfaceClass = USB_CLASS_COMM,
1757 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1758 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1759 .driver_info = (unsigned long) &wwan_info,
1762 /* tag Huawei devices as wwan */
1763 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1765 USB_CDC_SUBCLASS_NCM,
1766 USB_CDC_PROTO_NONE),
1767 .driver_info = (unsigned long)&wwan_info,
1770 /* Infineon(now Intel) HSPA Modem platform */
1771 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1773 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1774 .driver_info = (unsigned long)&wwan_noarp_info,
1777 /* u-blox TOBY-L4 */
1778 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
1780 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1781 .driver_info = (unsigned long)&wwan_info,
1784 /* Generic CDC-NCM devices */
1785 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1786 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1787 .driver_info = (unsigned long)&cdc_ncm_info,
1792 MODULE_DEVICE_TABLE(usb, cdc_devs);
1794 static struct usb_driver cdc_ncm_driver = {
1796 .id_table = cdc_devs,
1797 .probe = usbnet_probe,
1798 .disconnect = usbnet_disconnect,
1799 .suspend = usbnet_suspend,
1800 .resume = usbnet_resume,
1801 .reset_resume = usbnet_resume,
1802 .supports_autosuspend = 1,
1803 .disable_hub_initiated_lpm = 1,
1806 module_usb_driver(cdc_ncm_driver);
1808 MODULE_AUTHOR("Hans Petter Selasky");
1809 MODULE_DESCRIPTION("USB CDC NCM host driver");
1810 MODULE_LICENSE("Dual BSD/GPL");