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, S_IRUGO | S_IWUSR);
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 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
96 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
102 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
103 struct ethtool_stats __always_unused *stats,
106 struct usbnet *dev = netdev_priv(netdev);
107 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
111 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
112 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
113 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
117 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
124 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
125 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
126 p += ETH_GSTRING_LEN;
131 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
133 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
134 .get_settings = usbnet_get_settings,
135 .set_settings = usbnet_set_settings,
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,
147 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
149 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
152 /* clamp new_rx to sane values */
153 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
154 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
156 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
158 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
159 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
163 val = clamp_t(u32, new_rx, min, max);
165 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
170 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
172 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
175 /* clamp new_tx to sane values */
176 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
177 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
179 /* some devices set dwNtbOutMaxSize too low for the above default */
182 val = clamp_t(u32, new_tx, min, max);
184 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
189 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
191 struct usbnet *dev = netdev_priv(to_net_dev(d));
192 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
194 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
197 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
199 struct usbnet *dev = netdev_priv(to_net_dev(d));
200 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
202 return sprintf(buf, "%u\n", ctx->rx_max);
205 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
207 struct usbnet *dev = netdev_priv(to_net_dev(d));
208 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
210 return sprintf(buf, "%u\n", ctx->tx_max);
213 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
215 struct usbnet *dev = netdev_priv(to_net_dev(d));
216 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
218 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
221 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
223 struct usbnet *dev = netdev_priv(to_net_dev(d));
224 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
227 /* no need to restrict values - anything from 0 to infinity is OK */
228 if (kstrtoul(buf, 0, &val))
231 ctx->min_tx_pkt = val;
235 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, 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 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
244 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
248 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
250 struct usbnet *dev = netdev_priv(to_net_dev(d));
251 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
254 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
257 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
261 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
263 struct usbnet *dev = netdev_priv(to_net_dev(d));
264 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
268 ret = kstrtoul(buf, 0, &val);
271 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
274 spin_lock_bh(&ctx->mtx);
275 ctx->timer_interval = val * NSEC_PER_USEC;
276 if (!ctx->timer_interval)
277 ctx->tx_timer_pending = 0;
278 spin_unlock_bh(&ctx->mtx);
282 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
283 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
284 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
285 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
287 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
289 struct usbnet *dev = netdev_priv(to_net_dev(d));
290 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
292 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
295 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
297 struct usbnet *dev = netdev_priv(to_net_dev(d));
298 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
301 if (strtobool(buf, &enable))
305 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
308 if (enable && !ctx->delayed_ndp16) {
309 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
310 if (!ctx->delayed_ndp16)
314 /* flush pending data before changing flag */
315 netif_tx_lock_bh(dev->net);
316 usbnet_start_xmit(NULL, dev->net);
317 spin_lock_bh(&ctx->mtx);
319 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
321 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
322 spin_unlock_bh(&ctx->mtx);
323 netif_tx_unlock_bh(dev->net);
327 static DEVICE_ATTR_RW(ndp_to_end);
329 #define NCM_PARM_ATTR(name, format, tocpu) \
330 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
332 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
333 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
334 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
336 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
338 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
339 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
340 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
341 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
342 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
343 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
344 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
345 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
346 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
347 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
349 static struct attribute *cdc_ncm_sysfs_attrs[] = {
350 &dev_attr_min_tx_pkt.attr,
351 &dev_attr_ndp_to_end.attr,
352 &dev_attr_rx_max.attr,
353 &dev_attr_tx_max.attr,
354 &dev_attr_tx_timer_usecs.attr,
355 &dev_attr_bmNtbFormatsSupported.attr,
356 &dev_attr_dwNtbInMaxSize.attr,
357 &dev_attr_wNdpInDivisor.attr,
358 &dev_attr_wNdpInPayloadRemainder.attr,
359 &dev_attr_wNdpInAlignment.attr,
360 &dev_attr_dwNtbOutMaxSize.attr,
361 &dev_attr_wNdpOutDivisor.attr,
362 &dev_attr_wNdpOutPayloadRemainder.attr,
363 &dev_attr_wNdpOutAlignment.attr,
364 &dev_attr_wNtbOutMaxDatagrams.attr,
368 static struct attribute_group cdc_ncm_sysfs_attr_group = {
370 .attrs = cdc_ncm_sysfs_attrs,
373 /* handle rx_max and tx_max changes */
374 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
376 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
377 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
380 val = cdc_ncm_check_rx_max(dev, new_rx);
382 /* inform device about NTB input size changes */
383 if (val != ctx->rx_max) {
384 __le32 dwNtbInMaxSize = cpu_to_le32(val);
386 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
388 /* tell device to use new size */
389 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
390 USB_TYPE_CLASS | USB_DIR_OUT
391 | USB_RECIP_INTERFACE,
392 0, iface_no, &dwNtbInMaxSize, 4) < 0)
393 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
398 /* usbnet use these values for sizing rx queues */
399 if (dev->rx_urb_size != ctx->rx_max) {
400 dev->rx_urb_size = ctx->rx_max;
401 if (netif_running(dev->net))
402 usbnet_unlink_rx_urbs(dev);
405 val = cdc_ncm_check_tx_max(dev, new_tx);
406 if (val != ctx->tx_max)
407 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
409 /* Adding a pad byte here if necessary simplifies the handling
410 * in cdc_ncm_fill_tx_frame, making tx_max always represent
411 * the real skb max size.
413 * We cannot use dev->maxpacket here because this is called from
414 * .bind which is called before usbnet sets up dev->maxpacket
416 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
417 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
420 /* we might need to flush any pending tx buffers if running */
421 if (netif_running(dev->net) && val > ctx->tx_max) {
422 netif_tx_lock_bh(dev->net);
423 usbnet_start_xmit(NULL, dev->net);
424 /* make sure tx_curr_skb is reallocated if it was empty */
425 if (ctx->tx_curr_skb) {
426 dev_kfree_skb_any(ctx->tx_curr_skb);
427 ctx->tx_curr_skb = NULL;
430 netif_tx_unlock_bh(dev->net);
435 dev->hard_mtu = ctx->tx_max;
437 /* max qlen depend on hard_mtu and rx_urb_size */
438 usbnet_update_max_qlen(dev);
440 /* never pad more than 3 full USB packets per transfer */
441 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
442 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
445 /* helpers for NCM and MBIM differences */
446 static u8 cdc_ncm_flags(struct usbnet *dev)
448 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
450 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
451 return ctx->mbim_desc->bmNetworkCapabilities;
453 return ctx->func_desc->bmNetworkCapabilities;
457 static int cdc_ncm_eth_hlen(struct usbnet *dev)
459 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
464 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
466 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
467 return CDC_MBIM_MIN_DATAGRAM_SIZE;
468 return CDC_NCM_MIN_DATAGRAM_SIZE;
471 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
473 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
475 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
476 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
478 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
479 return CDC_NCM_MAX_DATAGRAM_SIZE;
482 /* initial one-time device setup. MUST be called with the data interface
485 static int cdc_ncm_init(struct usbnet *dev)
487 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
488 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
491 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
492 USB_TYPE_CLASS | USB_DIR_IN
493 |USB_RECIP_INTERFACE,
494 0, iface_no, &ctx->ncm_parm,
495 sizeof(ctx->ncm_parm));
497 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
498 return err; /* GET_NTB_PARAMETERS is required */
502 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
503 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
504 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
505 USB_TYPE_CLASS | USB_DIR_OUT
506 | USB_RECIP_INTERFACE,
507 USB_CDC_NCM_CRC_NOT_APPENDED,
510 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
513 /* set NTB format, if both formats are supported.
515 * "The host shall only send this command while the NCM Data
516 * Interface is in alternate setting 0."
518 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
519 USB_CDC_NCM_NTB32_SUPPORTED) {
520 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
521 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
522 USB_TYPE_CLASS | USB_DIR_OUT
523 | USB_RECIP_INTERFACE,
524 USB_CDC_NCM_NTB16_FORMAT,
527 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
530 /* set initial device values */
531 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
532 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
533 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
534 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
535 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
536 /* devices prior to NCM Errata shall set this field to zero */
537 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
539 dev_dbg(&dev->intf->dev,
540 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
541 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
542 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
544 /* max count of tx datagrams */
545 if ((ctx->tx_max_datagrams == 0) ||
546 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
547 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
549 /* set up maximum NDP size */
550 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
552 /* initial coalescing timer interval */
553 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
558 /* set a new max datagram size */
559 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
561 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
562 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
563 __le16 max_datagram_size;
567 /* set default based on descriptors */
568 ctx->max_datagram_size = clamp_t(u32, new_size,
569 cdc_ncm_min_dgram_size(dev),
570 CDC_NCM_MAX_DATAGRAM_SIZE);
572 /* inform the device about the selected Max Datagram Size? */
573 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
576 /* read current mtu value from device */
577 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
578 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
579 0, iface_no, &max_datagram_size, 2);
581 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
585 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
588 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
589 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
590 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
591 0, iface_no, &max_datagram_size, 2);
593 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
596 /* set MTU to max supported by the device if necessary */
597 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
599 /* do not exceed operater preferred MTU */
600 if (ctx->mbim_extended_desc) {
601 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
602 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
603 dev->net->mtu = mbim_mtu;
607 static void cdc_ncm_fix_modulus(struct usbnet *dev)
609 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
613 * verify that the structure alignment is:
615 * - not greater than the maximum transmit length
616 * - not less than four bytes
618 val = ctx->tx_ndp_modulus;
620 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
621 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
622 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
623 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
627 * verify that the payload alignment is:
629 * - not greater than the maximum transmit length
630 * - not less than four bytes
632 val = ctx->tx_modulus;
634 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
635 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
636 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
637 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
640 /* verify the payload remainder */
641 if (ctx->tx_remainder >= ctx->tx_modulus) {
642 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
643 ctx->tx_remainder = 0;
646 /* adjust TX-remainder according to NCM specification. */
647 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
648 (ctx->tx_modulus - 1));
651 static int cdc_ncm_setup(struct usbnet *dev)
653 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
656 /* be conservative when selecting intial buffer size to
657 * increase the number of hosts this will work for
659 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
660 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
661 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
662 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
664 /* clamp rx_max and tx_max and inform device */
665 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
667 /* sanitize the modulus and remainder values */
668 cdc_ncm_fix_modulus(dev);
670 /* set max datagram size */
671 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
676 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
678 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
681 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
683 e = intf->cur_altsetting->endpoint + ep;
684 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
685 case USB_ENDPOINT_XFER_INT:
686 if (usb_endpoint_dir_in(&e->desc)) {
692 case USB_ENDPOINT_XFER_BULK:
693 if (usb_endpoint_dir_in(&e->desc)) {
707 dev->in = usb_rcvbulkpipe(dev->udev,
708 in->desc.bEndpointAddress &
709 USB_ENDPOINT_NUMBER_MASK);
710 if (out && !dev->out)
711 dev->out = usb_sndbulkpipe(dev->udev,
712 out->desc.bEndpointAddress &
713 USB_ENDPOINT_NUMBER_MASK);
716 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
721 if (ctx->tx_rem_skb != NULL) {
722 dev_kfree_skb_any(ctx->tx_rem_skb);
723 ctx->tx_rem_skb = NULL;
726 if (ctx->tx_curr_skb != NULL) {
727 dev_kfree_skb_any(ctx->tx_curr_skb);
728 ctx->tx_curr_skb = NULL;
731 kfree(ctx->delayed_ndp16);
736 /* we need to override the usbnet change_mtu ndo for two reasons:
737 * - respect the negotiated maximum datagram size
738 * - avoid unwanted changes to rx and tx buffers
740 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
742 struct usbnet *dev = netdev_priv(net);
743 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
744 int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
746 if (new_mtu <= 0 || new_mtu > maxmtu)
751 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
753 static const struct net_device_ops cdc_ncm_netdev_ops = {
754 .ndo_open = usbnet_open,
755 .ndo_stop = usbnet_stop,
756 .ndo_start_xmit = usbnet_start_xmit,
757 .ndo_tx_timeout = usbnet_tx_timeout,
758 .ndo_change_mtu = cdc_ncm_change_mtu,
759 .ndo_set_mac_address = eth_mac_addr,
760 .ndo_validate_addr = eth_validate_addr,
763 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
765 struct cdc_ncm_ctx *ctx;
766 struct usb_driver *driver;
771 struct usb_cdc_parsed_header hdr;
773 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
777 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
778 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
779 ctx->bh.data = (unsigned long)dev;
780 ctx->bh.func = cdc_ncm_txpath_bh;
781 atomic_set(&ctx->stop, 0);
782 spin_lock_init(&ctx->mtx);
784 /* store ctx pointer in device data field */
785 dev->data[0] = (unsigned long)ctx;
787 /* only the control interface can be successfully probed */
790 /* get some pointers */
791 driver = driver_of(intf);
792 buf = intf->cur_altsetting->extra;
793 len = intf->cur_altsetting->extralen;
795 /* parse through descriptors associated with control interface */
796 cdc_parse_cdc_header(&hdr, intf, buf, len);
798 if (hdr.usb_cdc_union_desc)
799 ctx->data = usb_ifnum_to_if(dev->udev,
800 hdr.usb_cdc_union_desc->bSlaveInterface0);
801 ctx->ether_desc = hdr.usb_cdc_ether_desc;
802 ctx->func_desc = hdr.usb_cdc_ncm_desc;
803 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
804 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
806 /* some buggy devices have an IAD but no CDC Union */
807 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
808 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
809 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
812 /* check if we got everything */
814 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
817 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
818 if (!ctx->mbim_desc) {
819 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
823 if (!ctx->ether_desc || !ctx->func_desc) {
824 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
829 /* claim data interface, if different from control */
830 if (ctx->data != ctx->control) {
831 temp = usb_driver_claim_interface(driver, ctx->data, dev);
833 dev_dbg(&intf->dev, "failed to claim data intf\n");
838 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
840 /* reset data interface */
841 temp = usb_set_interface(dev->udev, iface_no, 0);
843 dev_dbg(&intf->dev, "set interface failed\n");
847 /* initialize basic device settings */
848 if (cdc_ncm_init(dev))
851 /* configure data interface */
852 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
854 dev_dbg(&intf->dev, "set interface failed\n");
858 cdc_ncm_find_endpoints(dev, ctx->data);
859 cdc_ncm_find_endpoints(dev, ctx->control);
860 if (!dev->in || !dev->out || !dev->status) {
861 dev_dbg(&intf->dev, "failed to collect endpoints\n");
865 usb_set_intfdata(ctx->data, dev);
866 usb_set_intfdata(ctx->control, dev);
868 if (ctx->ether_desc) {
869 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
871 dev_dbg(&intf->dev, "failed to get mac address\n");
874 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
877 /* finish setting up the device specific data */
880 /* Device-specific flags */
881 ctx->drvflags = drvflags;
883 /* Allocate the delayed NDP if needed. */
884 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
885 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
886 if (!ctx->delayed_ndp16)
888 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
891 /* override ethtool_ops */
892 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
894 /* add our sysfs attrs */
895 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
897 /* must handle MTU changes */
898 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
903 usb_set_intfdata(ctx->control, NULL);
904 usb_set_intfdata(ctx->data, NULL);
905 if (ctx->data != ctx->control)
906 usb_driver_release_interface(driver, ctx->data);
908 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
910 dev_info(&intf->dev, "bind() failure\n");
913 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
915 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
917 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
918 struct usb_driver *driver = driver_of(intf);
921 return; /* no setup */
923 atomic_set(&ctx->stop, 1);
925 if (hrtimer_active(&ctx->tx_timer))
926 hrtimer_cancel(&ctx->tx_timer);
928 tasklet_kill(&ctx->bh);
930 /* handle devices with combined control and data interface */
931 if (ctx->control == ctx->data)
934 /* disconnect master --> disconnect slave */
935 if (intf == ctx->control && ctx->data) {
936 usb_set_intfdata(ctx->data, NULL);
937 usb_driver_release_interface(driver, ctx->data);
940 } else if (intf == ctx->data && ctx->control) {
941 usb_set_intfdata(ctx->control, NULL);
942 usb_driver_release_interface(driver, ctx->control);
946 usb_set_intfdata(intf, NULL);
949 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
951 /* Return the number of the MBIM control interface altsetting iff it
952 * is preferred and available,
954 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
956 struct usb_host_interface *alt;
958 /* The MBIM spec defines a NCM compatible default altsetting,
959 * which we may have matched:
961 * "Functions that implement both NCM 1.0 and MBIM (an
962 * “NCM/MBIM function”) according to this recommendation
963 * shall provide two alternate settings for the
964 * Communication Interface. Alternate setting 0, and the
965 * associated class and endpoint descriptors, shall be
966 * constructed according to the rules given for the
967 * Communication Interface in section 5 of [USBNCM10].
968 * Alternate setting 1, and the associated class and
969 * endpoint descriptors, shall be constructed according to
970 * the rules given in section 6 (USB Device Model) of this
973 if (intf->num_altsetting < 2)
974 return intf->cur_altsetting->desc.bAlternateSetting;
977 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
978 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
979 return CDC_NCM_COMM_ALTSETTING_MBIM;
981 return CDC_NCM_COMM_ALTSETTING_NCM;
983 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
985 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
989 /* MBIM backwards compatible function? */
990 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
993 /* The NCM data altsetting is fixed, so we hard-coded it.
994 * Additionally, generic NCM devices are assumed to accept arbitrarily
997 ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1000 * We should get an event when network connection is "connected" or
1001 * "disconnected". Set network connection in "disconnected" state
1002 * (carrier is OFF) during attach, so the IP network stack does not
1003 * start IPv6 negotiation and more.
1005 usbnet_link_change(dev, 0, 0);
1009 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1011 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1013 if (skb->len + align > max)
1014 align = max - skb->len;
1015 if (align && skb_tailroom(skb) >= align)
1016 memset(skb_put(skb, align), 0, align);
1019 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1020 * allocating a new one within skb
1022 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1024 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1025 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1026 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1028 /* If NDP should be moved to the end of the NCM package, we can't follow the
1029 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1030 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1032 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1033 if (ctx->delayed_ndp16->dwSignature == sign)
1034 return ctx->delayed_ndp16;
1036 /* We can only push a single NDP to the end. Return
1037 * NULL to send what we've already got and queue this
1040 else if (ctx->delayed_ndp16->dwSignature)
1044 /* follow the chain of NDPs, looking for a match */
1046 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1047 if (ndp16->dwSignature == sign)
1049 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1053 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1054 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1056 /* verify that there is room for the NDP and the datagram (reserve) */
1057 if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size)
1062 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1064 nth16->wNdpIndex = cpu_to_le16(skb->len);
1066 /* push a new empty NDP */
1067 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1068 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size);
1070 ndp16 = ctx->delayed_ndp16;
1072 ndp16->dwSignature = sign;
1073 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1078 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1080 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1081 struct usb_cdc_ncm_nth16 *nth16;
1082 struct usb_cdc_ncm_ndp16 *ndp16;
1083 struct sk_buff *skb_out;
1084 u16 n = 0, index, ndplen;
1086 u32 delayed_ndp_size;
1088 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1089 * accordingly. Otherwise, we should check here.
1091 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1092 delayed_ndp_size = ctx->max_ndp_size;
1094 delayed_ndp_size = 0;
1096 /* if there is a remaining skb, it gets priority */
1098 swap(skb, ctx->tx_rem_skb);
1099 swap(sign, ctx->tx_rem_sign);
1104 /* check if we are resuming an OUT skb */
1105 skb_out = ctx->tx_curr_skb;
1107 /* allocate a new OUT skb */
1109 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
1110 if (skb_out == NULL) {
1112 dev_kfree_skb_any(skb);
1113 dev->net->stats.tx_dropped++;
1117 /* fill out the initial 16-bit NTB header */
1118 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16));
1119 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1120 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1121 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1123 /* count total number of frames in this NTB */
1124 ctx->tx_curr_frame_num = 0;
1126 /* recent payload counter for this skb_out */
1127 ctx->tx_curr_frame_payload = 0;
1130 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1131 /* send any remaining skb first */
1133 skb = ctx->tx_rem_skb;
1134 sign = ctx->tx_rem_sign;
1135 ctx->tx_rem_skb = NULL;
1137 /* check for end of skb */
1142 /* get the appropriate NDP for this skb */
1143 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1145 /* align beginning of next frame */
1146 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max);
1148 /* check if we had enough room left for both NDP and frame */
1149 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) {
1151 /* won't fit, MTU problem? */
1152 dev_kfree_skb_any(skb);
1154 dev->net->stats.tx_dropped++;
1156 /* no room for skb - store for later */
1157 if (ctx->tx_rem_skb != NULL) {
1158 dev_kfree_skb_any(ctx->tx_rem_skb);
1159 dev->net->stats.tx_dropped++;
1161 ctx->tx_rem_skb = skb;
1162 ctx->tx_rem_sign = sign;
1165 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1170 /* calculate frame number withing this NDP */
1171 ndplen = le16_to_cpu(ndp16->wLength);
1172 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1174 /* OK, add this skb */
1175 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1176 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1177 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1178 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len);
1179 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1180 dev_kfree_skb_any(skb);
1183 /* send now if this NDP is full */
1184 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1186 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1191 /* free up any dangling skb */
1193 dev_kfree_skb_any(skb);
1195 dev->net->stats.tx_dropped++;
1198 ctx->tx_curr_frame_num = n;
1201 /* wait for more frames */
1202 /* push variables */
1203 ctx->tx_curr_skb = skb_out;
1206 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1207 /* wait for more frames */
1208 /* push variables */
1209 ctx->tx_curr_skb = skb_out;
1210 /* set the pending count */
1211 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1212 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1216 if (n == ctx->tx_max_datagrams)
1217 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1218 /* frame goes out */
1219 /* variables will be reset at next call */
1222 /* If requested, put NDP at end of frame. */
1223 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1224 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1225 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max);
1226 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1227 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size);
1229 /* Zero out delayed NDP - signature checking will naturally fail. */
1230 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1233 /* If collected data size is less or equal ctx->min_tx_pkt
1234 * bytes, we send buffers as it is. If we get more data, it
1235 * would be more efficient for USB HS mobile device with DMA
1236 * engine to receive a full size NTB, than canceling DMA
1237 * transfer and receiving a short packet.
1239 * This optimization support is pointless if we end up sending
1240 * a ZLP after full sized NTBs.
1242 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1243 skb_out->len > ctx->min_tx_pkt)
1244 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0,
1245 ctx->tx_max - skb_out->len);
1246 else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0)
1247 *skb_put(skb_out, 1) = 0; /* force short packet */
1249 /* set final frame length */
1250 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1251 nth16->wBlockLength = cpu_to_le16(skb_out->len);
1254 ctx->tx_curr_skb = NULL;
1256 /* keep private stats: framing overhead and number of NTBs */
1257 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1260 /* usbnet will count all the framing overhead by default.
1261 * Adjust the stats so that the tx_bytes counter show real
1262 * payload data instead.
1264 usbnet_set_skb_tx_stats(skb_out, n,
1265 (long)ctx->tx_curr_frame_payload - skb_out->len);
1270 /* Start timer, if there is a remaining non-empty skb */
1271 if (ctx->tx_curr_skb != NULL && n > 0)
1272 cdc_ncm_tx_timeout_start(ctx);
1275 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1277 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1279 /* start timer, if not already started */
1280 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1281 hrtimer_start(&ctx->tx_timer,
1282 ktime_set(0, ctx->timer_interval),
1286 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1288 struct cdc_ncm_ctx *ctx =
1289 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1291 if (!atomic_read(&ctx->stop))
1292 tasklet_schedule(&ctx->bh);
1293 return HRTIMER_NORESTART;
1296 static void cdc_ncm_txpath_bh(unsigned long param)
1298 struct usbnet *dev = (struct usbnet *)param;
1299 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1301 spin_lock_bh(&ctx->mtx);
1302 if (ctx->tx_timer_pending != 0) {
1303 ctx->tx_timer_pending--;
1304 cdc_ncm_tx_timeout_start(ctx);
1305 spin_unlock_bh(&ctx->mtx);
1306 } else if (dev->net != NULL) {
1307 ctx->tx_reason_timeout++; /* count reason for transmitting */
1308 spin_unlock_bh(&ctx->mtx);
1309 netif_tx_lock_bh(dev->net);
1310 usbnet_start_xmit(NULL, dev->net);
1311 netif_tx_unlock_bh(dev->net);
1313 spin_unlock_bh(&ctx->mtx);
1318 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1320 struct sk_buff *skb_out;
1321 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1324 * The Ethernet API we are using does not support transmitting
1325 * multiple Ethernet frames in a single call. This driver will
1326 * accumulate multiple Ethernet frames and send out a larger
1327 * USB frame when the USB buffer is full or when a single jiffies
1333 spin_lock_bh(&ctx->mtx);
1334 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1335 spin_unlock_bh(&ctx->mtx);
1340 dev_kfree_skb_any(skb);
1344 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1346 /* verify NTB header and return offset of first NDP, or negative error */
1347 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1349 struct usbnet *dev = netdev_priv(skb_in->dev);
1350 struct usb_cdc_ncm_nth16 *nth16;
1357 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1358 sizeof(struct usb_cdc_ncm_ndp16))) {
1359 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1363 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1365 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1366 netif_dbg(dev, rx_err, dev->net,
1367 "invalid NTH16 signature <%#010x>\n",
1368 le32_to_cpu(nth16->dwSignature));
1372 len = le16_to_cpu(nth16->wBlockLength);
1373 if (len > ctx->rx_max) {
1374 netif_dbg(dev, rx_err, dev->net,
1375 "unsupported NTB block length %u/%u\n", len,
1380 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1381 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1382 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1383 netif_dbg(dev, rx_err, dev->net,
1384 "sequence number glitch prev=%d curr=%d\n",
1385 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1387 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1389 ret = le16_to_cpu(nth16->wNdpIndex);
1393 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1395 /* verify NDP header and return number of datagrams, or negative error */
1396 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1398 struct usbnet *dev = netdev_priv(skb_in->dev);
1399 struct usb_cdc_ncm_ndp16 *ndp16;
1402 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1403 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1407 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1409 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1410 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1411 le16_to_cpu(ndp16->wLength));
1415 ret = ((le16_to_cpu(ndp16->wLength) -
1416 sizeof(struct usb_cdc_ncm_ndp16)) /
1417 sizeof(struct usb_cdc_ncm_dpe16));
1418 ret--; /* we process NDP entries except for the last one */
1420 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1421 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1422 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1429 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1431 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1433 struct sk_buff *skb;
1434 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1439 struct usb_cdc_ncm_ndp16 *ndp16;
1440 struct usb_cdc_ncm_dpe16 *dpe16;
1442 int loopcount = 50; /* arbitrary max preventing infinite loop */
1445 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1450 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1454 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1456 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1457 netif_dbg(dev, rx_err, dev->net,
1458 "invalid DPT16 signature <%#010x>\n",
1459 le32_to_cpu(ndp16->dwSignature));
1462 dpe16 = ndp16->dpe16;
1464 for (x = 0; x < nframes; x++, dpe16++) {
1465 offset = le16_to_cpu(dpe16->wDatagramIndex);
1466 len = le16_to_cpu(dpe16->wDatagramLength);
1470 * All entries after first NULL entry are to be ignored
1472 if ((offset == 0) || (len == 0)) {
1474 goto err_ndp; /* empty NTB */
1478 /* sanity checking */
1479 if (((offset + len) > skb_in->len) ||
1480 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1481 netif_dbg(dev, rx_err, dev->net,
1482 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1483 x, offset, len, skb_in);
1489 /* create a fresh copy to reduce truesize */
1490 skb = netdev_alloc_skb_ip_align(dev->net, len);
1493 memcpy(skb_put(skb, len), skb_in->data + offset, len);
1494 usbnet_skb_return(dev, skb);
1495 payload += len; /* count payload bytes in this NTB */
1499 /* are there more NDPs to process? */
1500 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1501 if (ndpoffset && loopcount--)
1505 ctx->rx_overhead += skb_in->len - payload;
1512 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1515 cdc_ncm_speed_change(struct usbnet *dev,
1516 struct usb_cdc_speed_change *data)
1518 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1519 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1522 * Currently the USB-NET API does not support reporting the actual
1523 * device speed. Do print it instead.
1525 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1526 netif_info(dev, link, dev->net,
1527 "%u mbit/s downlink %u mbit/s uplink\n",
1528 (unsigned int)(rx_speed / 1000000U),
1529 (unsigned int)(tx_speed / 1000000U));
1531 netif_info(dev, link, dev->net,
1532 "%u kbit/s downlink %u kbit/s uplink\n",
1533 (unsigned int)(rx_speed / 1000U),
1534 (unsigned int)(tx_speed / 1000U));
1538 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1540 struct cdc_ncm_ctx *ctx;
1541 struct usb_cdc_notification *event;
1543 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1545 if (urb->actual_length < sizeof(*event))
1548 /* test for split data in 8-byte chunks */
1549 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1550 cdc_ncm_speed_change(dev,
1551 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1555 event = urb->transfer_buffer;
1557 switch (event->bNotificationType) {
1558 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1560 * According to the CDC NCM specification ch.7.1
1561 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1562 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1564 netif_info(dev, link, dev->net,
1565 "network connection: %sconnected\n",
1566 !!event->wValue ? "" : "dis");
1567 usbnet_link_change(dev, !!event->wValue, 0);
1570 case USB_CDC_NOTIFY_SPEED_CHANGE:
1571 if (urb->actual_length < (sizeof(*event) +
1572 sizeof(struct usb_cdc_speed_change)))
1573 set_bit(EVENT_STS_SPLIT, &dev->flags);
1575 cdc_ncm_speed_change(dev,
1576 (struct usb_cdc_speed_change *)&event[1]);
1580 dev_dbg(&dev->udev->dev,
1581 "NCM: unexpected notification 0x%02x!\n",
1582 event->bNotificationType);
1587 static const struct driver_info cdc_ncm_info = {
1588 .description = "CDC NCM",
1589 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1590 .bind = cdc_ncm_bind,
1591 .unbind = cdc_ncm_unbind,
1592 .manage_power = usbnet_manage_power,
1593 .status = cdc_ncm_status,
1594 .rx_fixup = cdc_ncm_rx_fixup,
1595 .tx_fixup = cdc_ncm_tx_fixup,
1598 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1599 static const struct driver_info wwan_info = {
1600 .description = "Mobile Broadband Network Device",
1601 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1603 .bind = cdc_ncm_bind,
1604 .unbind = cdc_ncm_unbind,
1605 .manage_power = usbnet_manage_power,
1606 .status = cdc_ncm_status,
1607 .rx_fixup = cdc_ncm_rx_fixup,
1608 .tx_fixup = cdc_ncm_tx_fixup,
1611 /* Same as wwan_info, but with FLAG_NOARP */
1612 static const struct driver_info wwan_noarp_info = {
1613 .description = "Mobile Broadband Network Device (NO ARP)",
1614 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1615 | FLAG_WWAN | FLAG_NOARP,
1616 .bind = cdc_ncm_bind,
1617 .unbind = cdc_ncm_unbind,
1618 .manage_power = usbnet_manage_power,
1619 .status = cdc_ncm_status,
1620 .rx_fixup = cdc_ncm_rx_fixup,
1621 .tx_fixup = cdc_ncm_tx_fixup,
1624 static const struct usb_device_id cdc_devs[] = {
1625 /* Ericsson MBM devices like F5521gw */
1626 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1627 | USB_DEVICE_ID_MATCH_VENDOR,
1629 .bInterfaceClass = USB_CLASS_COMM,
1630 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1631 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1632 .driver_info = (unsigned long) &wwan_info,
1635 /* DW5812 LTE Verizon Mobile Broadband Card
1636 * Unlike DW5550 this device requires FLAG_NOARP
1638 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1640 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1641 .driver_info = (unsigned long)&wwan_noarp_info,
1644 /* DW5813 LTE AT&T Mobile Broadband Card
1645 * Unlike DW5550 this device requires FLAG_NOARP
1647 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1649 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1650 .driver_info = (unsigned long)&wwan_noarp_info,
1653 /* Dell branded MBM devices like DW5550 */
1654 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1655 | USB_DEVICE_ID_MATCH_VENDOR,
1657 .bInterfaceClass = USB_CLASS_COMM,
1658 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1659 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1660 .driver_info = (unsigned long) &wwan_info,
1663 /* Toshiba branded MBM devices */
1664 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1665 | USB_DEVICE_ID_MATCH_VENDOR,
1667 .bInterfaceClass = USB_CLASS_COMM,
1668 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1669 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1670 .driver_info = (unsigned long) &wwan_info,
1673 /* tag Huawei devices as wwan */
1674 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1676 USB_CDC_SUBCLASS_NCM,
1677 USB_CDC_PROTO_NONE),
1678 .driver_info = (unsigned long)&wwan_info,
1681 /* Infineon(now Intel) HSPA Modem platform */
1682 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1684 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1685 .driver_info = (unsigned long)&wwan_noarp_info,
1688 /* Generic CDC-NCM devices */
1689 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1690 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1691 .driver_info = (unsigned long)&cdc_ncm_info,
1696 MODULE_DEVICE_TABLE(usb, cdc_devs);
1698 static struct usb_driver cdc_ncm_driver = {
1700 .id_table = cdc_devs,
1701 .probe = usbnet_probe,
1702 .disconnect = usbnet_disconnect,
1703 .suspend = usbnet_suspend,
1704 .resume = usbnet_resume,
1705 .reset_resume = usbnet_resume,
1706 .supports_autosuspend = 1,
1707 .disable_hub_initiated_lpm = 1,
1710 module_usb_driver(cdc_ncm_driver);
1712 MODULE_AUTHOR("Hans Petter Selasky");
1713 MODULE_DESCRIPTION("USB CDC NCM host driver");
1714 MODULE_LICENSE("Dual BSD/GPL");