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/devclass_docs/NCM10.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/init.h>
43 #include <linux/netdevice.h>
44 #include <linux/ctype.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>
55 #define DRIVER_VERSION "14-Mar-2012"
57 /* CDC NCM subclass 3.2.1 */
58 #define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
60 /* Maximum NTB length */
61 #define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
62 #define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */
64 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
65 #define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
67 /* Minimum value for MaxDatagramSize, ch. 8.1.3 */
68 #define CDC_MBIM_MIN_DATAGRAM_SIZE 2048 /* bytes */
70 #define CDC_NCM_MIN_TX_PKT 512 /* bytes */
72 /* Default value for MaxDatagramSize */
73 #define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */
76 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
77 * the last NULL entry.
79 #define CDC_NCM_DPT_DATAGRAMS_MAX 40
81 /* Restart the timer, if amount of datagrams is less than given value */
82 #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
83 #define CDC_NCM_TIMER_PENDING_CNT 2
84 #define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
86 /* The following macro defines the minimum header space */
87 #define CDC_NCM_MIN_HDR_SIZE \
88 (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
89 (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
92 struct usb_cdc_ncm_nth16 nth16;
93 struct usb_cdc_ncm_ndp16 ndp16;
94 struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1];
98 struct cdc_ncm_data tx_ncm;
99 struct usb_cdc_ncm_ntb_parameters ncm_parm;
100 struct hrtimer tx_timer;
101 struct tasklet_struct bh;
103 const struct usb_cdc_ncm_desc *func_desc;
104 const struct usb_cdc_mbim_desc *mbim_desc;
105 const struct usb_cdc_header_desc *header_desc;
106 const struct usb_cdc_union_desc *union_desc;
107 const struct usb_cdc_ether_desc *ether_desc;
109 struct net_device *netdev;
110 struct usb_device *udev;
111 struct usb_host_endpoint *in_ep;
112 struct usb_host_endpoint *out_ep;
113 struct usb_host_endpoint *status_ep;
114 struct usb_interface *intf;
115 struct usb_interface *control;
116 struct usb_interface *data;
118 struct sk_buff *tx_curr_skb;
119 struct sk_buff *tx_rem_skb;
124 u32 tx_timer_pending;
126 u32 tx_curr_last_offset;
127 u32 tx_curr_frame_num;
132 u32 max_datagram_size;
133 u16 tx_max_datagrams;
142 static void cdc_ncm_txpath_bh(unsigned long param);
143 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
144 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
145 static struct usb_driver cdc_ncm_driver;
148 cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info)
150 struct usbnet *dev = netdev_priv(net);
152 strncpy(info->driver, dev->driver_name, sizeof(info->driver));
153 strncpy(info->version, DRIVER_VERSION, sizeof(info->version));
154 strncpy(info->fw_version, dev->driver_info->description,
155 sizeof(info->fw_version));
156 usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
159 static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
166 u16 ntb_fmt_supported;
170 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
172 err = usb_control_msg(ctx->udev,
173 usb_rcvctrlpipe(ctx->udev, 0),
174 USB_CDC_GET_NTB_PARAMETERS,
175 USB_TYPE_CLASS | USB_DIR_IN
176 | USB_RECIP_INTERFACE,
177 0, iface_no, &ctx->ncm_parm,
178 sizeof(ctx->ncm_parm), 10000);
180 pr_debug("failed GET_NTB_PARAMETERS\n");
184 /* read correct set of parameters according to device mode */
185 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
186 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
187 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
188 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
189 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
190 /* devices prior to NCM Errata shall set this field to zero */
191 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
192 ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
195 min_dgram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
196 min_hdr_size = CDC_NCM_MIN_HDR_SIZE;
197 if (ctx->mbim_desc != NULL) {
198 flags = ctx->mbim_desc->bmNetworkCapabilities;
200 min_dgram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
202 } else if (ctx->func_desc != NULL) {
203 flags = ctx->func_desc->bmNetworkCapabilities;
208 pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
209 "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
210 "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
211 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
212 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags);
214 /* max count of tx datagrams */
215 if ((ctx->tx_max_datagrams == 0) ||
216 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
217 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
219 /* verify maximum size of received NTB in bytes */
220 if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) {
221 pr_debug("Using min receive length=%d\n",
222 USB_CDC_NCM_NTB_MIN_IN_SIZE);
223 ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
226 if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
227 pr_debug("Using default maximum receive length=%d\n",
228 CDC_NCM_NTB_MAX_SIZE_RX);
229 ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
232 /* inform device about NTB input size changes */
233 if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
234 __le32 *dwNtbInMaxSize;
236 dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize), GFP_KERNEL);
237 if (!dwNtbInMaxSize) {
241 *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
242 err = usb_control_msg(ctx->udev,
243 usb_sndctrlpipe(ctx->udev, 0),
244 USB_CDC_SET_NTB_INPUT_SIZE,
245 USB_TYPE_CLASS | USB_DIR_OUT
246 | USB_RECIP_INTERFACE,
247 0, iface_no, dwNtbInMaxSize, 4, 1000);
248 kfree(dwNtbInMaxSize);
251 pr_debug("Setting NTB Input Size failed\n");
254 /* verify maximum size of transmitted NTB in bytes */
256 (min_hdr_size + min_dgram_size)) ||
257 (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
258 pr_debug("Using default maximum transmit length=%d\n",
259 CDC_NCM_NTB_MAX_SIZE_TX);
260 ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
264 * verify that the structure alignment is:
266 * - not greater than the maximum transmit length
267 * - not less than four bytes
269 val = ctx->tx_ndp_modulus;
271 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
272 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
273 pr_debug("Using default alignment: 4 bytes\n");
274 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
278 * verify that the payload alignment is:
280 * - not greater than the maximum transmit length
281 * - not less than four bytes
283 val = ctx->tx_modulus;
285 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
286 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
287 pr_debug("Using default transmit modulus: 4 bytes\n");
288 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
291 /* verify the payload remainder */
292 if (ctx->tx_remainder >= ctx->tx_modulus) {
293 pr_debug("Using default transmit remainder: 0 bytes\n");
294 ctx->tx_remainder = 0;
297 /* adjust TX-remainder according to NCM specification. */
298 ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
299 (ctx->tx_modulus - 1));
301 /* additional configuration */
304 if (flags & USB_CDC_NCM_NCAP_CRC_MODE) {
305 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
306 USB_CDC_SET_CRC_MODE,
307 USB_TYPE_CLASS | USB_DIR_OUT
308 | USB_RECIP_INTERFACE,
309 USB_CDC_NCM_CRC_NOT_APPENDED,
310 iface_no, NULL, 0, 1000);
312 pr_debug("Setting CRC mode off failed\n");
315 /* set NTB format, if both formats are supported */
316 if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) {
317 err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0),
318 USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS
319 | USB_DIR_OUT | USB_RECIP_INTERFACE,
320 USB_CDC_NCM_NTB16_FORMAT,
321 iface_no, NULL, 0, 1000);
323 pr_debug("Setting NTB format to 16-bit failed\n");
326 ctx->max_datagram_size = min_dgram_size;
328 /* set Max Datagram Size (MTU) */
329 if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
330 __le16 *max_datagram_size;
332 if (ctx->ether_desc != NULL)
333 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
334 else if (ctx->mbim_desc != NULL)
335 eth_max_sz = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
339 max_datagram_size = kzalloc(sizeof(*max_datagram_size),
341 if (!max_datagram_size) {
346 err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
347 USB_CDC_GET_MAX_DATAGRAM_SIZE,
348 USB_TYPE_CLASS | USB_DIR_IN
349 | USB_RECIP_INTERFACE,
350 0, iface_no, max_datagram_size,
353 pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
356 ctx->max_datagram_size =
357 le16_to_cpu(*max_datagram_size);
358 /* Check Eth descriptor value */
359 if (ctx->max_datagram_size > eth_max_sz)
360 ctx->max_datagram_size = eth_max_sz;
362 if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
363 ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE;
365 if (ctx->max_datagram_size < min_dgram_size)
366 ctx->max_datagram_size = min_dgram_size;
368 /* if value changed, update device */
369 if (ctx->max_datagram_size !=
370 le16_to_cpu(*max_datagram_size)) {
371 err = usb_control_msg(ctx->udev,
372 usb_sndctrlpipe(ctx->udev, 0),
373 USB_CDC_SET_MAX_DATAGRAM_SIZE,
374 USB_TYPE_CLASS | USB_DIR_OUT
375 | USB_RECIP_INTERFACE,
377 iface_no, max_datagram_size,
380 pr_debug("SET_MAX_DGRAM_SIZE failed\n");
383 kfree(max_datagram_size);
387 if (ctx->netdev->mtu != (ctx->max_datagram_size - eth_hlen))
388 ctx->netdev->mtu = ctx->max_datagram_size - eth_hlen;
394 cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf)
396 struct usb_host_endpoint *e;
399 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
401 e = intf->cur_altsetting->endpoint + ep;
402 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
403 case USB_ENDPOINT_XFER_INT:
404 if (usb_endpoint_dir_in(&e->desc)) {
405 if (ctx->status_ep == NULL)
410 case USB_ENDPOINT_XFER_BULK:
411 if (usb_endpoint_dir_in(&e->desc)) {
412 if (ctx->in_ep == NULL)
415 if (ctx->out_ep == NULL)
426 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
431 if (ctx->tx_rem_skb != NULL) {
432 dev_kfree_skb_any(ctx->tx_rem_skb);
433 ctx->tx_rem_skb = NULL;
436 if (ctx->tx_curr_skb != NULL) {
437 dev_kfree_skb_any(ctx->tx_curr_skb);
438 ctx->tx_curr_skb = NULL;
444 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
445 .get_drvinfo = cdc_ncm_get_drvinfo,
446 .get_link = usbnet_get_link,
447 .get_msglevel = usbnet_get_msglevel,
448 .set_msglevel = usbnet_set_msglevel,
449 .get_settings = usbnet_get_settings,
450 .set_settings = usbnet_set_settings,
451 .nway_reset = usbnet_nway_reset,
454 static int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting)
456 struct cdc_ncm_ctx *ctx;
457 struct usb_driver *driver;
463 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
467 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
468 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
469 ctx->bh.data = (unsigned long)ctx;
470 ctx->bh.func = cdc_ncm_txpath_bh;
471 atomic_set(&ctx->stop, 0);
472 spin_lock_init(&ctx->mtx);
473 ctx->netdev = dev->net;
475 /* store ctx pointer in device data field */
476 dev->data[0] = (unsigned long)ctx;
478 /* get some pointers */
479 driver = driver_of(intf);
480 buf = intf->cur_altsetting->extra;
481 len = intf->cur_altsetting->extralen;
483 ctx->udev = dev->udev;
486 /* parse through descriptors associated with control interface */
487 while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
489 if (buf[1] != USB_DT_CS_INTERFACE)
493 case USB_CDC_UNION_TYPE:
494 if (buf[0] < sizeof(*(ctx->union_desc)))
498 (const struct usb_cdc_union_desc *)buf;
500 ctx->control = usb_ifnum_to_if(dev->udev,
501 ctx->union_desc->bMasterInterface0);
502 ctx->data = usb_ifnum_to_if(dev->udev,
503 ctx->union_desc->bSlaveInterface0);
506 case USB_CDC_ETHERNET_TYPE:
507 if (buf[0] < sizeof(*(ctx->ether_desc)))
511 (const struct usb_cdc_ether_desc *)buf;
513 le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
515 if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE)
516 dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE;
517 else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE)
518 dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE;
521 case USB_CDC_NCM_TYPE:
522 if (buf[0] < sizeof(*(ctx->func_desc)))
525 ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
528 case USB_CDC_MBIM_TYPE:
529 if (buf[0] < sizeof(*(ctx->mbim_desc)))
532 ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
539 /* advance to next descriptor */
545 /* check if we got everything */
546 if ((ctx->control == NULL) || (ctx->data == NULL) ||
547 ((!ctx->mbim_desc) && ((ctx->ether_desc == NULL) || (ctx->control != intf))))
550 /* claim interfaces, if any */
551 temp = usb_driver_claim_interface(driver, ctx->data, dev);
555 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
557 /* reset data interface */
558 temp = usb_set_interface(dev->udev, iface_no, 0);
562 /* initialize data interface */
563 if (cdc_ncm_setup(ctx))
566 /* configure data interface */
567 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
571 cdc_ncm_find_endpoints(ctx, ctx->data);
572 cdc_ncm_find_endpoints(ctx, ctx->control);
574 if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) ||
575 (ctx->status_ep == NULL))
578 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
580 usb_set_intfdata(ctx->data, dev);
581 usb_set_intfdata(ctx->control, dev);
582 usb_set_intfdata(ctx->intf, dev);
584 if (ctx->ether_desc) {
585 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
588 dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
592 dev->in = usb_rcvbulkpipe(dev->udev,
593 ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
594 dev->out = usb_sndbulkpipe(dev->udev,
595 ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
596 dev->status = ctx->status_ep;
597 dev->rx_urb_size = ctx->rx_max;
599 ctx->tx_speed = ctx->rx_speed = 0;
603 usb_set_intfdata(ctx->control, NULL);
604 usb_set_intfdata(ctx->data, NULL);
605 usb_driver_release_interface(driver, ctx->data);
607 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
609 dev_info(&dev->udev->dev, "bind() failure\n");
613 static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
615 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
616 struct usb_driver *driver = driver_of(intf);
619 return; /* no setup */
621 atomic_set(&ctx->stop, 1);
623 if (hrtimer_active(&ctx->tx_timer))
624 hrtimer_cancel(&ctx->tx_timer);
626 tasklet_kill(&ctx->bh);
628 /* disconnect master --> disconnect slave */
629 if (intf == ctx->control && ctx->data) {
630 usb_set_intfdata(ctx->data, NULL);
631 usb_driver_release_interface(driver, ctx->data);
634 } else if (intf == ctx->data && ctx->control) {
635 usb_set_intfdata(ctx->control, NULL);
636 usb_driver_release_interface(driver, ctx->control);
640 usb_set_intfdata(ctx->intf, NULL);
644 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
648 /* NCM data altsetting is always 1 */
649 ret = cdc_ncm_bind_common(dev, intf, 1);
652 * We should get an event when network connection is "connected" or
653 * "disconnected". Set network connection in "disconnected" state
654 * (carrier is OFF) during attach, so the IP network stack does not
655 * start IPv6 negotiation and more.
657 netif_carrier_off(dev->net);
661 static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max)
669 memset(ptr + first, 0, end - first);
672 static struct sk_buff *
673 cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
675 struct sk_buff *skb_out;
682 /* if there is a remaining skb, it gets priority */
684 swap(skb, ctx->tx_rem_skb);
696 /* check if we are resuming an OUT skb */
697 if (ctx->tx_curr_skb != NULL) {
699 skb_out = ctx->tx_curr_skb;
700 offset = ctx->tx_curr_offset;
701 last_offset = ctx->tx_curr_last_offset;
702 n = ctx->tx_curr_frame_num;
705 /* reset variables */
706 skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
707 if (skb_out == NULL) {
709 dev_kfree_skb_any(skb);
710 ctx->netdev->stats.tx_dropped++;
715 /* make room for NTH and NDP */
716 offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16),
717 ctx->tx_ndp_modulus) +
718 sizeof(struct usb_cdc_ncm_ndp16) +
719 (ctx->tx_max_datagrams + 1) *
720 sizeof(struct usb_cdc_ncm_dpe16);
722 /* store last valid offset before alignment */
723 last_offset = offset;
724 /* align first Datagram offset correctly */
725 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
726 /* zero buffer till the first IP datagram */
727 cdc_ncm_zero_fill(skb_out->data, 0, offset, offset);
729 ctx->tx_curr_frame_num = 0;
732 for (; n < ctx->tx_max_datagrams; n++) {
733 /* check if end of transmit buffer is reached */
734 if (offset >= ctx->tx_max) {
738 /* compute maximum buffer size */
739 rem = ctx->tx_max - offset;
742 skb = ctx->tx_rem_skb;
743 ctx->tx_rem_skb = NULL;
745 /* check for end of skb */
750 if (skb->len > rem) {
752 /* won't fit, MTU problem? */
753 dev_kfree_skb_any(skb);
755 ctx->netdev->stats.tx_dropped++;
757 /* no room for skb - store for later */
758 if (ctx->tx_rem_skb != NULL) {
759 dev_kfree_skb_any(ctx->tx_rem_skb);
760 ctx->netdev->stats.tx_dropped++;
762 ctx->tx_rem_skb = skb;
769 memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len);
771 ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len);
772 ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset);
777 /* store last valid offset before alignment */
778 last_offset = offset;
780 /* align offset correctly */
781 offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder;
784 cdc_ncm_zero_fill(skb_out->data, last_offset, offset,
786 dev_kfree_skb_any(skb);
790 /* free up any dangling skb */
792 dev_kfree_skb_any(skb);
794 ctx->netdev->stats.tx_dropped++;
797 ctx->tx_curr_frame_num = n;
800 /* wait for more frames */
802 ctx->tx_curr_skb = skb_out;
803 ctx->tx_curr_offset = offset;
804 ctx->tx_curr_last_offset = last_offset;
807 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) {
808 /* wait for more frames */
810 ctx->tx_curr_skb = skb_out;
811 ctx->tx_curr_offset = offset;
812 ctx->tx_curr_last_offset = last_offset;
813 /* set the pending count */
814 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
815 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
820 /* variables will be reset at next call */
823 /* check for overflow */
824 if (last_offset > ctx->tx_max)
825 last_offset = ctx->tx_max;
828 offset = last_offset;
831 * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes,
832 * we send buffers as it is. If we get more data, it would be more
833 * efficient for USB HS mobile device with DMA engine to receive a full
834 * size NTB, than canceling DMA transfer and receiving a short packet.
836 if (offset > CDC_NCM_MIN_TX_PKT)
837 offset = ctx->tx_max;
839 /* final zero padding */
840 cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max);
842 /* store last offset */
843 last_offset = offset;
845 if (((last_offset < ctx->tx_max) && ((last_offset %
846 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
847 (((last_offset == ctx->tx_max) && ((ctx->tx_max %
848 le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
849 (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
850 /* force short packet */
851 *(((u8 *)skb_out->data) + last_offset) = 0;
855 /* zero the rest of the DPEs plus the last NULL entry */
856 for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) {
857 ctx->tx_ncm.dpe16[n].wDatagramLength = 0;
858 ctx->tx_ncm.dpe16[n].wDatagramIndex = 0;
861 /* fill out 16-bit NTB header */
862 ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
863 ctx->tx_ncm.nth16.wHeaderLength =
864 cpu_to_le16(sizeof(ctx->tx_ncm.nth16));
865 ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq);
866 ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset);
867 index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus);
868 ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index);
870 memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16));
873 /* fill out 16-bit NDP table */
874 ctx->tx_ncm.ndp16.dwSignature =
875 cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN);
876 rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) *
877 sizeof(struct usb_cdc_ncm_dpe16));
878 ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem);
879 ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */
881 memcpy(((u8 *)skb_out->data) + index,
882 &(ctx->tx_ncm.ndp16),
883 sizeof(ctx->tx_ncm.ndp16));
885 memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16),
886 &(ctx->tx_ncm.dpe16),
887 (ctx->tx_curr_frame_num + 1) *
888 sizeof(struct usb_cdc_ncm_dpe16));
890 /* set frame length */
891 skb_put(skb_out, last_offset);
894 ctx->tx_curr_skb = NULL;
895 ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num;
899 /* Start timer, if there is a remaining skb */
900 if (ctx->tx_curr_skb != NULL)
901 cdc_ncm_tx_timeout_start(ctx);
905 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
907 /* start timer, if not already started */
908 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
909 hrtimer_start(&ctx->tx_timer,
910 ktime_set(0, CDC_NCM_TIMER_INTERVAL),
914 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
916 struct cdc_ncm_ctx *ctx =
917 container_of(timer, struct cdc_ncm_ctx, tx_timer);
919 if (!atomic_read(&ctx->stop))
920 tasklet_schedule(&ctx->bh);
921 return HRTIMER_NORESTART;
924 static void cdc_ncm_txpath_bh(unsigned long param)
926 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param;
928 spin_lock_bh(&ctx->mtx);
929 if (ctx->tx_timer_pending != 0) {
930 ctx->tx_timer_pending--;
931 cdc_ncm_tx_timeout_start(ctx);
932 spin_unlock_bh(&ctx->mtx);
933 } else if (ctx->netdev != NULL) {
934 spin_unlock_bh(&ctx->mtx);
935 netif_tx_lock_bh(ctx->netdev);
936 usbnet_start_xmit(NULL, ctx->netdev);
937 netif_tx_unlock_bh(ctx->netdev);
941 static struct sk_buff *
942 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
944 struct sk_buff *skb_out;
945 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
948 * The Ethernet API we are using does not support transmitting
949 * multiple Ethernet frames in a single call. This driver will
950 * accumulate multiple Ethernet frames and send out a larger
951 * USB frame when the USB buffer is full or when a single jiffies
957 spin_lock_bh(&ctx->mtx);
958 skb_out = cdc_ncm_fill_tx_frame(ctx, skb);
959 spin_unlock_bh(&ctx->mtx);
964 dev_kfree_skb_any(skb);
969 static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
972 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
977 struct usb_cdc_ncm_nth16 *nth16;
978 struct usb_cdc_ncm_ndp16 *ndp16;
979 struct usb_cdc_ncm_dpe16 *dpe16;
981 int loopcount = 50; /* arbitrary max preventing infinite loop */
986 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
987 sizeof(struct usb_cdc_ncm_ndp16))) {
988 pr_debug("frame too short\n");
992 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
994 if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) {
995 pr_debug("invalid NTH16 signature <%u>\n",
996 le32_to_cpu(nth16->dwSignature));
1000 len = le16_to_cpu(nth16->wBlockLength);
1001 if (len > ctx->rx_max) {
1002 pr_debug("unsupported NTB block length %u/%u\n", len,
1007 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1008 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1009 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1010 pr_debug("sequence number glitch prev=%d curr=%d\n",
1011 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1013 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1015 ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1017 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1018 pr_debug("invalid NDP offset <%u>\n", ndpoffset);
1021 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1023 if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) {
1024 pr_debug("invalid DPT16 signature <%u>\n",
1025 le32_to_cpu(ndp16->dwSignature));
1029 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1030 pr_debug("invalid DPT16 length <%u>\n",
1031 le32_to_cpu(ndp16->dwSignature));
1035 nframes = ((le16_to_cpu(ndp16->wLength) -
1036 sizeof(struct usb_cdc_ncm_ndp16)) /
1037 sizeof(struct usb_cdc_ncm_dpe16));
1038 nframes--; /* we process NDP entries except for the last one */
1040 ndpoffset += sizeof(struct usb_cdc_ncm_ndp16);
1042 if ((ndpoffset + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) >
1044 pr_debug("Invalid nframes = %d\n", nframes);
1048 dpe16 = (struct usb_cdc_ncm_dpe16 *)(skb_in->data + ndpoffset);
1050 for (x = 0; x < nframes; x++, dpe16++) {
1051 offset = le16_to_cpu(dpe16->wDatagramIndex);
1052 len = le16_to_cpu(dpe16->wDatagramLength);
1056 * All entries after first NULL entry are to be ignored
1058 if ((offset == 0) || (len == 0)) {
1060 goto err_ndp; /* empty NTB */
1064 /* sanity checking */
1065 if (((offset + len) > skb_in->len) ||
1066 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1067 pr_debug("invalid frame detected (ignored)"
1068 "offset[%u]=%u, length=%u, skb=%p\n",
1069 x, offset, len, skb_in);
1075 skb = skb_clone(skb_in, GFP_ATOMIC);
1079 skb->data = ((u8 *)skb_in->data) + offset;
1080 skb_set_tail_pointer(skb, len);
1081 usbnet_skb_return(dev, skb);
1085 /* are there more NDPs to process? */
1086 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1087 if (ndpoffset && loopcount--)
1096 cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx,
1097 struct usb_cdc_speed_change *data)
1099 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1100 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1103 * Currently the USB-NET API does not support reporting the actual
1104 * device speed. Do print it instead.
1106 if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) {
1107 ctx->tx_speed = tx_speed;
1108 ctx->rx_speed = rx_speed;
1110 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1111 printk(KERN_INFO KBUILD_MODNAME
1112 ": %s: %u mbit/s downlink "
1113 "%u mbit/s uplink\n",
1115 (unsigned int)(rx_speed / 1000000U),
1116 (unsigned int)(tx_speed / 1000000U));
1118 printk(KERN_INFO KBUILD_MODNAME
1119 ": %s: %u kbit/s downlink "
1120 "%u kbit/s uplink\n",
1122 (unsigned int)(rx_speed / 1000U),
1123 (unsigned int)(tx_speed / 1000U));
1128 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1130 struct cdc_ncm_ctx *ctx;
1131 struct usb_cdc_notification *event;
1133 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1135 if (urb->actual_length < sizeof(*event))
1138 /* test for split data in 8-byte chunks */
1139 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1140 cdc_ncm_speed_change(ctx,
1141 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1145 event = urb->transfer_buffer;
1147 switch (event->bNotificationType) {
1148 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1150 * According to the CDC NCM specification ch.7.1
1151 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1152 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1154 ctx->connected = event->wValue;
1156 printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
1158 ctx->netdev->name, ctx->connected ? "" : "dis");
1161 netif_carrier_on(dev->net);
1163 netif_carrier_off(dev->net);
1164 ctx->tx_speed = ctx->rx_speed = 0;
1168 case USB_CDC_NOTIFY_SPEED_CHANGE:
1169 if (urb->actual_length < (sizeof(*event) +
1170 sizeof(struct usb_cdc_speed_change)))
1171 set_bit(EVENT_STS_SPLIT, &dev->flags);
1173 cdc_ncm_speed_change(ctx,
1174 (struct usb_cdc_speed_change *) &event[1]);
1178 dev_err(&dev->udev->dev, "NCM: unexpected "
1179 "notification 0x%02x!\n", event->bNotificationType);
1184 static int cdc_ncm_check_connect(struct usbnet *dev)
1186 struct cdc_ncm_ctx *ctx;
1188 ctx = (struct cdc_ncm_ctx *)dev->data[0];
1190 return 1; /* disconnected */
1192 return !ctx->connected;
1196 cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod)
1198 return usbnet_probe(udev, prod);
1201 static void cdc_ncm_disconnect(struct usb_interface *intf)
1203 struct usbnet *dev = usb_get_intfdata(intf);
1206 return; /* already disconnected */
1208 usbnet_disconnect(intf);
1211 static int cdc_ncm_manage_power(struct usbnet *dev, int status)
1213 dev->intf->needs_remote_wakeup = status;
1217 static const struct driver_info cdc_ncm_info = {
1218 .description = "CDC NCM",
1219 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET,
1220 .bind = cdc_ncm_bind,
1221 .unbind = cdc_ncm_unbind,
1222 .check_connect = cdc_ncm_check_connect,
1223 .manage_power = cdc_ncm_manage_power,
1224 .status = cdc_ncm_status,
1225 .rx_fixup = cdc_ncm_rx_fixup,
1226 .tx_fixup = cdc_ncm_tx_fixup,
1229 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1230 static const struct driver_info wwan_info = {
1231 .description = "Mobile Broadband Network Device",
1232 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1234 .bind = cdc_ncm_bind,
1235 .unbind = cdc_ncm_unbind,
1236 .check_connect = cdc_ncm_check_connect,
1237 .manage_power = cdc_ncm_manage_power,
1238 .status = cdc_ncm_status,
1239 .rx_fixup = cdc_ncm_rx_fixup,
1240 .tx_fixup = cdc_ncm_tx_fixup,
1243 static const struct usb_device_id cdc_devs[] = {
1244 /* Ericsson MBM devices like F5521gw */
1245 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1246 | USB_DEVICE_ID_MATCH_VENDOR,
1248 .bInterfaceClass = USB_CLASS_COMM,
1249 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1250 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1251 .driver_info = (unsigned long) &wwan_info,
1254 /* Dell branded MBM devices like DW5550 */
1255 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1256 | USB_DEVICE_ID_MATCH_VENDOR,
1258 .bInterfaceClass = USB_CLASS_COMM,
1259 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1260 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1261 .driver_info = (unsigned long) &wwan_info,
1264 /* Toshiba branded MBM devices */
1265 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1266 | USB_DEVICE_ID_MATCH_VENDOR,
1268 .bInterfaceClass = USB_CLASS_COMM,
1269 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1270 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1271 .driver_info = (unsigned long) &wwan_info,
1274 /* Generic CDC-NCM devices */
1275 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1276 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1277 .driver_info = (unsigned long)&cdc_ncm_info,
1282 MODULE_DEVICE_TABLE(usb, cdc_devs);
1284 static struct usb_driver cdc_ncm_driver = {
1286 .id_table = cdc_devs,
1287 .probe = cdc_ncm_probe,
1288 .disconnect = cdc_ncm_disconnect,
1289 .suspend = usbnet_suspend,
1290 .resume = usbnet_resume,
1291 .reset_resume = usbnet_resume,
1292 .supports_autosuspend = 1,
1293 .disable_hub_initiated_lpm = 1,
1296 module_usb_driver(cdc_ncm_driver);
1298 MODULE_AUTHOR("Hans Petter Selasky");
1299 MODULE_DESCRIPTION("USB CDC NCM host driver");
1300 MODULE_LICENSE("Dual BSD/GPL");