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[deliverable/linux.git] / drivers / net / usb / sierra_net.c
1 /*
2 * USB-to-WWAN Driver for Sierra Wireless modems
3 *
4 * Copyright (C) 2008, 2009, 2010 Paxton Smith, Matthew Safar, Rory Filer
5 * <linux@sierrawireless.com>
6 *
7 * Portions of this based on the cdc_ether driver by David Brownell (2003-2005)
8 * and Ole Andre Vadla Ravnas (ActiveSync) (2006).
9 *
10 * IMPORTANT DISCLAIMER: This driver is not commercially supported by
11 * Sierra Wireless. Use at your own risk.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 */
27
28 #define DRIVER_VERSION "v.2.0"
29 #define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
30 #define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
31 static const char driver_name[] = "sierra_net";
32
33 /* if defined debug messages enabled */
34 /*#define DEBUG*/
35
36 #include <linux/module.h>
37 #include <linux/etherdevice.h>
38 #include <linux/ethtool.h>
39 #include <linux/mii.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/usb.h>
43 #include <linux/usb/cdc.h>
44 #include <net/ip.h>
45 #include <net/udp.h>
46 #include <asm/unaligned.h>
47 #include <linux/usb/usbnet.h>
48
49 #define SWI_USB_REQUEST_GET_FW_ATTR 0x06
50 #define SWI_GET_FW_ATTR_MASK 0x08
51
52 /* atomic counter partially included in MAC address to make sure 2 devices
53 * do not end up with the same MAC - concept breaks in case of > 255 ifaces
54 */
55 static atomic_t iface_counter = ATOMIC_INIT(0);
56
57 /*
58 * SYNC Timer Delay definition used to set the expiry time
59 */
60 #define SIERRA_NET_SYNCDELAY (2*HZ)
61
62 /* Max. MTU supported. The modem buffers are limited to 1500 */
63 #define SIERRA_NET_MAX_SUPPORTED_MTU 1500
64
65 /* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
66 * message reception ... and thus the max. received packet.
67 * (May be the cause for parse_hip returning -EINVAL)
68 */
69 #define SIERRA_NET_USBCTL_BUF_LEN 1024
70
71 /* Overriding the default usbnet rx_urb_size */
72 #define SIERRA_NET_RX_URB_SIZE (8 * 1024)
73
74 /* Private data structure */
75 struct sierra_net_data {
76
77 u8 ethr_hdr_tmpl[ETH_HLEN]; /* ethernet header template for rx'd pkts */
78
79 u16 link_up; /* air link up or down */
80 u8 tx_hdr_template[4]; /* part of HIP hdr for tx'd packets */
81
82 u8 sync_msg[4]; /* SYNC message */
83 u8 shdwn_msg[4]; /* Shutdown message */
84
85 /* Backpointer to the container */
86 struct usbnet *usbnet;
87
88 u8 ifnum; /* interface number */
89
90 /* Bit masks, must be a power of 2 */
91 #define SIERRA_NET_EVENT_RESP_AVAIL 0x01
92 #define SIERRA_NET_TIMER_EXPIRY 0x02
93 unsigned long kevent_flags;
94 struct work_struct sierra_net_kevent;
95 struct timer_list sync_timer; /* For retrying SYNC sequence */
96 };
97
98 struct param {
99 int is_present;
100 union {
101 void *ptr;
102 u32 dword;
103 u16 word;
104 u8 byte;
105 };
106 };
107
108 /* HIP message type */
109 #define SIERRA_NET_HIP_EXTENDEDID 0x7F
110 #define SIERRA_NET_HIP_HSYNC_ID 0x60 /* Modem -> host */
111 #define SIERRA_NET_HIP_RESTART_ID 0x62 /* Modem -> host */
112 #define SIERRA_NET_HIP_MSYNC_ID 0x20 /* Host -> modem */
113 #define SIERRA_NET_HIP_SHUTD_ID 0x26 /* Host -> modem */
114
115 #define SIERRA_NET_HIP_EXT_IP_IN_ID 0x0202
116 #define SIERRA_NET_HIP_EXT_IP_OUT_ID 0x0002
117
118 /* 3G UMTS Link Sense Indication definitions */
119 #define SIERRA_NET_HIP_LSI_UMTSID 0x78
120
121 /* Reverse Channel Grant Indication HIP message */
122 #define SIERRA_NET_HIP_RCGI 0x64
123
124 /* LSI Protocol types */
125 #define SIERRA_NET_PROTOCOL_UMTS 0x01
126 /* LSI Coverage */
127 #define SIERRA_NET_COVERAGE_NONE 0x00
128 #define SIERRA_NET_COVERAGE_NOPACKET 0x01
129
130 /* LSI Session */
131 #define SIERRA_NET_SESSION_IDLE 0x00
132 /* LSI Link types */
133 #define SIERRA_NET_AS_LINK_TYPE_IPv4 0x00
134
135 struct lsi_umts {
136 u8 protocol;
137 u8 unused1;
138 __be16 length;
139 /* eventually use a union for the rest - assume umts for now */
140 u8 coverage;
141 u8 unused2[41];
142 u8 session_state;
143 u8 unused3[33];
144 u8 link_type;
145 u8 pdp_addr_len; /* NW-supplied PDP address len */
146 u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
147 u8 unused4[23];
148 u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
149 u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
150 u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
151 u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
152 u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
153 u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
154 u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
155 u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
156 u8 unused5[4];
157 u8 gw_addr_len; /* NW-supplied GW address len */
158 u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
159 u8 reserved[8];
160 } __packed;
161
162 #define SIERRA_NET_LSI_COMMON_LEN 4
163 #define SIERRA_NET_LSI_UMTS_LEN (sizeof(struct lsi_umts))
164 #define SIERRA_NET_LSI_UMTS_STATUS_LEN \
165 (SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
166
167 /* Forward definitions */
168 static void sierra_sync_timer(unsigned long syncdata);
169 static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
170
171 /* Our own net device operations structure */
172 static const struct net_device_ops sierra_net_device_ops = {
173 .ndo_open = usbnet_open,
174 .ndo_stop = usbnet_stop,
175 .ndo_start_xmit = usbnet_start_xmit,
176 .ndo_tx_timeout = usbnet_tx_timeout,
177 .ndo_change_mtu = sierra_net_change_mtu,
178 .ndo_set_mac_address = eth_mac_addr,
179 .ndo_validate_addr = eth_validate_addr,
180 };
181
182 /* get private data associated with passed in usbnet device */
183 static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
184 {
185 return (struct sierra_net_data *)dev->data[0];
186 }
187
188 /* set private data associated with passed in usbnet device */
189 static inline void sierra_net_set_private(struct usbnet *dev,
190 struct sierra_net_data *priv)
191 {
192 dev->data[0] = (unsigned long)priv;
193 }
194
195 /* is packet IPv4 */
196 static inline int is_ip(struct sk_buff *skb)
197 {
198 return skb->protocol == cpu_to_be16(ETH_P_IP);
199 }
200
201 /*
202 * check passed in packet and make sure that:
203 * - it is linear (no scatter/gather)
204 * - it is ethernet (mac_header properly set)
205 */
206 static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
207 {
208 skb_reset_mac_header(skb); /* ethernet header */
209
210 if (skb_is_nonlinear(skb)) {
211 netdev_err(dev->net, "Non linear buffer-dropping\n");
212 return 0;
213 }
214
215 if (!pskb_may_pull(skb, ETH_HLEN))
216 return 0;
217 skb->protocol = eth_hdr(skb)->h_proto;
218
219 return 1;
220 }
221
222 static const u8 *save16bit(struct param *p, const u8 *datap)
223 {
224 p->is_present = 1;
225 p->word = get_unaligned_be16(datap);
226 return datap + sizeof(p->word);
227 }
228
229 static const u8 *save8bit(struct param *p, const u8 *datap)
230 {
231 p->is_present = 1;
232 p->byte = *datap;
233 return datap + sizeof(p->byte);
234 }
235
236 /*----------------------------------------------------------------------------*
237 * BEGIN HIP *
238 *----------------------------------------------------------------------------*/
239 /* HIP header */
240 #define SIERRA_NET_HIP_HDR_LEN 4
241 /* Extended HIP header */
242 #define SIERRA_NET_HIP_EXT_HDR_LEN 6
243
244 struct hip_hdr {
245 int hdrlen;
246 struct param payload_len;
247 struct param msgid;
248 struct param msgspecific;
249 struct param extmsgid;
250 };
251
252 static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
253 {
254 const u8 *curp = buf;
255 int padded;
256
257 if (buflen < SIERRA_NET_HIP_HDR_LEN)
258 return -EPROTO;
259
260 curp = save16bit(&hh->payload_len, curp);
261 curp = save8bit(&hh->msgid, curp);
262 curp = save8bit(&hh->msgspecific, curp);
263
264 padded = hh->msgid.byte & 0x80;
265 hh->msgid.byte &= 0x7F; /* 7 bits */
266
267 hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
268 if (hh->extmsgid.is_present) {
269 if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
270 return -EPROTO;
271
272 hh->payload_len.word &= 0x3FFF; /* 14 bits */
273
274 curp = save16bit(&hh->extmsgid, curp);
275 hh->extmsgid.word &= 0x03FF; /* 10 bits */
276
277 hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
278 } else {
279 hh->payload_len.word &= 0x07FF; /* 11 bits */
280 hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
281 }
282
283 if (padded) {
284 hh->hdrlen++;
285 hh->payload_len.word--;
286 }
287
288 /* if real packet shorter than the claimed length */
289 if (buflen < (hh->hdrlen + hh->payload_len.word))
290 return -EINVAL;
291
292 return 0;
293 }
294
295 static void build_hip(u8 *buf, const u16 payloadlen,
296 struct sierra_net_data *priv)
297 {
298 /* the following doesn't have the full functionality. We
299 * currently build only one kind of header, so it is faster this way
300 */
301 put_unaligned_be16(payloadlen, buf);
302 memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
303 }
304 /*----------------------------------------------------------------------------*
305 * END HIP *
306 *----------------------------------------------------------------------------*/
307
308 static int sierra_net_send_cmd(struct usbnet *dev,
309 u8 *cmd, int cmdlen, const char * cmd_name)
310 {
311 struct sierra_net_data *priv = sierra_net_get_private(dev);
312 int status;
313
314 status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
315 USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
316 0, priv->ifnum, cmd, cmdlen);
317
318 if (status != cmdlen && status != -ENODEV)
319 netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
320
321 return status;
322 }
323
324 static int sierra_net_send_sync(struct usbnet *dev)
325 {
326 int status;
327 struct sierra_net_data *priv = sierra_net_get_private(dev);
328
329 dev_dbg(&dev->udev->dev, "%s", __func__);
330
331 status = sierra_net_send_cmd(dev, priv->sync_msg,
332 sizeof(priv->sync_msg), "SYNC");
333
334 return status;
335 }
336
337 static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
338 {
339 dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
340 priv->tx_hdr_template[0] = 0x3F;
341 priv->tx_hdr_template[1] = ctx_ix;
342 *((__be16 *)&priv->tx_hdr_template[2]) =
343 cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
344 }
345
346 static inline int sierra_net_is_valid_addrlen(u8 len)
347 {
348 return len == sizeof(struct in_addr);
349 }
350
351 static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
352 {
353 struct lsi_umts *lsi = (struct lsi_umts *)data;
354
355 if (datalen < sizeof(struct lsi_umts)) {
356 netdev_err(dev->net, "%s: Data length %d, exp %Zu\n",
357 __func__, datalen,
358 sizeof(struct lsi_umts));
359 return -1;
360 }
361
362 if (lsi->length != cpu_to_be16(SIERRA_NET_LSI_UMTS_STATUS_LEN)) {
363 netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
364 __func__, be16_to_cpu(lsi->length),
365 (u32)SIERRA_NET_LSI_UMTS_STATUS_LEN);
366 return -1;
367 }
368
369 /* Validate the protocol - only support UMTS for now */
370 if (lsi->protocol != SIERRA_NET_PROTOCOL_UMTS) {
371 netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
372 lsi->protocol);
373 return -1;
374 }
375
376 /* Validate the link type */
377 if (lsi->link_type != SIERRA_NET_AS_LINK_TYPE_IPv4) {
378 netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
379 lsi->link_type);
380 return -1;
381 }
382
383 /* Validate the coverage */
384 if (lsi->coverage == SIERRA_NET_COVERAGE_NONE
385 || lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
386 netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
387 return 0;
388 }
389
390 /* Validate the session state */
391 if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
392 netdev_err(dev->net, "Session idle, 0x%02x\n",
393 lsi->session_state);
394 return 0;
395 }
396
397 /* Set link_sense true */
398 return 1;
399 }
400
401 static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
402 struct hip_hdr *hh)
403 {
404 struct sierra_net_data *priv = sierra_net_get_private(dev);
405 int link_up;
406
407 link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
408 hh->payload_len.word);
409 if (link_up < 0) {
410 netdev_err(dev->net, "Invalid LSI\n");
411 return;
412 }
413 if (link_up) {
414 sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
415 priv->link_up = 1;
416 } else {
417 priv->link_up = 0;
418 }
419 usbnet_link_change(dev, link_up, 0);
420 }
421
422 static void sierra_net_dosync(struct usbnet *dev)
423 {
424 int status;
425 struct sierra_net_data *priv = sierra_net_get_private(dev);
426
427 dev_dbg(&dev->udev->dev, "%s", __func__);
428
429 /* tell modem we are ready */
430 status = sierra_net_send_sync(dev);
431 if (status < 0)
432 netdev_err(dev->net,
433 "Send SYNC failed, status %d\n", status);
434 status = sierra_net_send_sync(dev);
435 if (status < 0)
436 netdev_err(dev->net,
437 "Send SYNC failed, status %d\n", status);
438
439 /* Now, start a timer and make sure we get the Restart Indication */
440 priv->sync_timer.function = sierra_sync_timer;
441 priv->sync_timer.data = (unsigned long) dev;
442 priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
443 add_timer(&priv->sync_timer);
444 }
445
446 static void sierra_net_kevent(struct work_struct *work)
447 {
448 struct sierra_net_data *priv =
449 container_of(work, struct sierra_net_data, sierra_net_kevent);
450 struct usbnet *dev = priv->usbnet;
451 int len;
452 int err;
453 u8 *buf;
454 u8 ifnum;
455
456 if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
457 clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
458
459 /* Query the modem for the LSI message */
460 buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
461 if (!buf)
462 return;
463
464 ifnum = priv->ifnum;
465 len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
466 USB_CDC_GET_ENCAPSULATED_RESPONSE,
467 USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
468 0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
469 USB_CTRL_SET_TIMEOUT);
470
471 if (len < 0) {
472 netdev_err(dev->net,
473 "usb_control_msg failed, status %d\n", len);
474 } else {
475 struct hip_hdr hh;
476
477 dev_dbg(&dev->udev->dev, "%s: Received status message,"
478 " %04x bytes", __func__, len);
479
480 err = parse_hip(buf, len, &hh);
481 if (err) {
482 netdev_err(dev->net, "%s: Bad packet,"
483 " parse result %d\n", __func__, err);
484 kfree(buf);
485 return;
486 }
487
488 /* Validate packet length */
489 if (len != hh.hdrlen + hh.payload_len.word) {
490 netdev_err(dev->net, "%s: Bad packet, received"
491 " %d, expected %d\n", __func__, len,
492 hh.hdrlen + hh.payload_len.word);
493 kfree(buf);
494 return;
495 }
496
497 /* Switch on received message types */
498 switch (hh.msgid.byte) {
499 case SIERRA_NET_HIP_LSI_UMTSID:
500 dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
501 hh.msgspecific.byte);
502 sierra_net_handle_lsi(dev, buf, &hh);
503 break;
504 case SIERRA_NET_HIP_RESTART_ID:
505 dev_dbg(&dev->udev->dev, "Restart reported: %d,"
506 " stopping sync timer",
507 hh.msgspecific.byte);
508 /* Got sync resp - stop timer & clear mask */
509 del_timer_sync(&priv->sync_timer);
510 clear_bit(SIERRA_NET_TIMER_EXPIRY,
511 &priv->kevent_flags);
512 break;
513 case SIERRA_NET_HIP_HSYNC_ID:
514 dev_dbg(&dev->udev->dev, "SYNC received");
515 err = sierra_net_send_sync(dev);
516 if (err < 0)
517 netdev_err(dev->net,
518 "Send SYNC failed %d\n", err);
519 break;
520 case SIERRA_NET_HIP_EXTENDEDID:
521 netdev_err(dev->net, "Unrecognized HIP msg, "
522 "extmsgid 0x%04x\n", hh.extmsgid.word);
523 break;
524 case SIERRA_NET_HIP_RCGI:
525 /* Ignored */
526 break;
527 default:
528 netdev_err(dev->net, "Unrecognized HIP msg, "
529 "msgid 0x%02x\n", hh.msgid.byte);
530 break;
531 }
532 }
533 kfree(buf);
534 }
535 /* The sync timer bit might be set */
536 if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
537 clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
538 dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
539 sierra_net_dosync(priv->usbnet);
540 }
541
542 if (priv->kevent_flags)
543 dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
544 "kevent_flags = 0x%lx", priv->kevent_flags);
545 }
546
547 static void sierra_net_defer_kevent(struct usbnet *dev, int work)
548 {
549 struct sierra_net_data *priv = sierra_net_get_private(dev);
550
551 set_bit(work, &priv->kevent_flags);
552 schedule_work(&priv->sierra_net_kevent);
553 }
554
555 /*
556 * Sync Retransmit Timer Handler. On expiry, kick the work queue
557 */
558 static void sierra_sync_timer(unsigned long syncdata)
559 {
560 struct usbnet *dev = (struct usbnet *)syncdata;
561
562 dev_dbg(&dev->udev->dev, "%s", __func__);
563 /* Kick the tasklet */
564 sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
565 }
566
567 static void sierra_net_status(struct usbnet *dev, struct urb *urb)
568 {
569 struct usb_cdc_notification *event;
570
571 dev_dbg(&dev->udev->dev, "%s", __func__);
572
573 if (urb->actual_length < sizeof *event)
574 return;
575
576 /* Add cases to handle other standard notifications. */
577 event = urb->transfer_buffer;
578 switch (event->bNotificationType) {
579 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
580 case USB_CDC_NOTIFY_SPEED_CHANGE:
581 /* USB 305 sends those */
582 break;
583 case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
584 sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
585 break;
586 default:
587 netdev_err(dev->net, ": unexpected notification %02x!\n",
588 event->bNotificationType);
589 break;
590 }
591 }
592
593 static void sierra_net_get_drvinfo(struct net_device *net,
594 struct ethtool_drvinfo *info)
595 {
596 /* Inherit standard device info */
597 usbnet_get_drvinfo(net, info);
598 strlcpy(info->driver, driver_name, sizeof(info->driver));
599 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
600 }
601
602 static u32 sierra_net_get_link(struct net_device *net)
603 {
604 struct usbnet *dev = netdev_priv(net);
605 /* Report link is down whenever the interface is down */
606 return sierra_net_get_private(dev)->link_up && netif_running(net);
607 }
608
609 static const struct ethtool_ops sierra_net_ethtool_ops = {
610 .get_drvinfo = sierra_net_get_drvinfo,
611 .get_link = sierra_net_get_link,
612 .get_msglevel = usbnet_get_msglevel,
613 .set_msglevel = usbnet_set_msglevel,
614 .get_settings = usbnet_get_settings,
615 .set_settings = usbnet_set_settings,
616 .nway_reset = usbnet_nway_reset,
617 };
618
619 /* MTU can not be more than 1500 bytes, enforce it. */
620 static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
621 {
622 if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
623 return -EINVAL;
624
625 return usbnet_change_mtu(net, new_mtu);
626 }
627
628 static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
629 {
630 int result = 0;
631 __le16 attrdata;
632
633 result = usbnet_read_cmd(dev,
634 /* _u8 vendor specific request */
635 SWI_USB_REQUEST_GET_FW_ATTR,
636 USB_DIR_IN | USB_TYPE_VENDOR, /* __u8 request type */
637 0x0000, /* __u16 value not used */
638 0x0000, /* __u16 index not used */
639 &attrdata, /* char *data */
640 sizeof(attrdata) /* __u16 size */
641 );
642
643 if (result < 0)
644 return -EIO;
645
646 *datap = le16_to_cpu(attrdata);
647 return result;
648 }
649
650 /*
651 * collects the bulk endpoints, the status endpoint.
652 */
653 static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
654 {
655 u8 ifacenum;
656 u8 numendpoints;
657 u16 fwattr = 0;
658 int status;
659 struct ethhdr *eth;
660 struct sierra_net_data *priv;
661 static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
662 0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
663 static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
664 0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
665
666 dev_dbg(&dev->udev->dev, "%s", __func__);
667
668 ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
669 numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
670 /* We have three endpoints, bulk in and out, and a status */
671 if (numendpoints != 3) {
672 dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
673 numendpoints);
674 return -ENODEV;
675 }
676 /* Status endpoint set in usbnet_get_endpoints() */
677 dev->status = NULL;
678 status = usbnet_get_endpoints(dev, intf);
679 if (status < 0) {
680 dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
681 status);
682 return -ENODEV;
683 }
684 /* Initialize sierra private data */
685 priv = kzalloc(sizeof *priv, GFP_KERNEL);
686 if (!priv)
687 return -ENOMEM;
688
689 priv->usbnet = dev;
690 priv->ifnum = ifacenum;
691 dev->net->netdev_ops = &sierra_net_device_ops;
692
693 /* change MAC addr to include, ifacenum, and to be unique */
694 dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
695 dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
696
697 /* we will have to manufacture ethernet headers, prepare template */
698 eth = (struct ethhdr *)priv->ethr_hdr_tmpl;
699 memcpy(&eth->h_dest, dev->net->dev_addr, ETH_ALEN);
700 eth->h_proto = cpu_to_be16(ETH_P_IP);
701
702 /* prepare shutdown message template */
703 memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
704 /* set context index initially to 0 - prepares tx hdr template */
705 sierra_net_set_ctx_index(priv, 0);
706
707 /* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
708 dev->rx_urb_size = SIERRA_NET_RX_URB_SIZE;
709 if (dev->udev->speed != USB_SPEED_HIGH)
710 dev->rx_urb_size = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
711
712 dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
713 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
714
715 /* Set up the netdev */
716 dev->net->flags |= IFF_NOARP;
717 dev->net->ethtool_ops = &sierra_net_ethtool_ops;
718 netif_carrier_off(dev->net);
719
720 sierra_net_set_private(dev, priv);
721
722 priv->kevent_flags = 0;
723
724 /* Use the shared workqueue */
725 INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
726
727 /* Only need to do this once */
728 init_timer(&priv->sync_timer);
729
730 /* verify fw attributes */
731 status = sierra_net_get_fw_attr(dev, &fwattr);
732 dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
733
734 /* test whether firmware supports DHCP */
735 if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
736 /* found incompatible firmware version */
737 dev_err(&dev->udev->dev, "Incompatible driver and firmware"
738 " versions\n");
739 kfree(priv);
740 return -ENODEV;
741 }
742 /* prepare sync message from template */
743 memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
744
745 /* initiate the sync sequence */
746 sierra_net_dosync(dev);
747
748 return 0;
749 }
750
751 static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
752 {
753 int status;
754 struct sierra_net_data *priv = sierra_net_get_private(dev);
755
756 dev_dbg(&dev->udev->dev, "%s", __func__);
757
758 /* kill the timer and work */
759 del_timer_sync(&priv->sync_timer);
760 cancel_work_sync(&priv->sierra_net_kevent);
761
762 /* tell modem we are going away */
763 status = sierra_net_send_cmd(dev, priv->shdwn_msg,
764 sizeof(priv->shdwn_msg), "Shutdown");
765 if (status < 0)
766 netdev_err(dev->net,
767 "usb_control_msg failed, status %d\n", status);
768
769 sierra_net_set_private(dev, NULL);
770
771 kfree(priv);
772 }
773
774 static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
775 struct sk_buff *skb, int len)
776 {
777 struct sk_buff *new_skb;
778
779 /* clone skb */
780 new_skb = skb_clone(skb, GFP_ATOMIC);
781
782 /* remove len bytes from original */
783 skb_pull(skb, len);
784
785 /* trim next packet to it's length */
786 if (new_skb) {
787 skb_trim(new_skb, len);
788 } else {
789 if (netif_msg_rx_err(dev))
790 netdev_err(dev->net, "failed to get skb\n");
791 dev->net->stats.rx_dropped++;
792 }
793
794 return new_skb;
795 }
796
797 /* ---------------------------- Receive data path ----------------------*/
798 static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
799 {
800 int err;
801 struct hip_hdr hh;
802 struct sk_buff *new_skb;
803
804 dev_dbg(&dev->udev->dev, "%s", __func__);
805
806 /* could contain multiple packets */
807 while (likely(skb->len)) {
808 err = parse_hip(skb->data, skb->len, &hh);
809 if (err) {
810 if (netif_msg_rx_err(dev))
811 netdev_err(dev->net, "Invalid HIP header %d\n",
812 err);
813 /* dev->net->stats.rx_errors incremented by caller */
814 dev->net->stats.rx_length_errors++;
815 return 0;
816 }
817
818 /* Validate Extended HIP header */
819 if (!hh.extmsgid.is_present
820 || hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
821 if (netif_msg_rx_err(dev))
822 netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
823
824 dev->net->stats.rx_frame_errors++;
825 /* dev->net->stats.rx_errors incremented by caller */
826 return 0;
827 }
828
829 skb_pull(skb, hh.hdrlen);
830
831 /* We are going to accept this packet, prepare it */
832 memcpy(skb->data, sierra_net_get_private(dev)->ethr_hdr_tmpl,
833 ETH_HLEN);
834
835 /* Last packet in batch handled by usbnet */
836 if (hh.payload_len.word == skb->len)
837 return 1;
838
839 new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
840 if (new_skb)
841 usbnet_skb_return(dev, new_skb);
842
843 } /* while */
844
845 return 0;
846 }
847
848 /* ---------------------------- Transmit data path ----------------------*/
849 static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev,
850 struct sk_buff *skb, gfp_t flags)
851 {
852 struct sierra_net_data *priv = sierra_net_get_private(dev);
853 u16 len;
854 bool need_tail;
855
856 BUILD_BUG_ON(FIELD_SIZEOF(struct usbnet, data)
857 < sizeof(struct cdc_state));
858
859 dev_dbg(&dev->udev->dev, "%s", __func__);
860 if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
861 /* enough head room as is? */
862 if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
863 /* Save the Eth/IP length and set up HIP hdr */
864 len = skb->len;
865 skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
866 /* Handle ZLP issue */
867 need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
868 % dev->maxpacket == 0);
869 if (need_tail) {
870 if (unlikely(skb_tailroom(skb) == 0)) {
871 netdev_err(dev->net, "tx_fixup:"
872 "no room for packet\n");
873 dev_kfree_skb_any(skb);
874 return NULL;
875 } else {
876 skb->data[skb->len] = 0;
877 __skb_put(skb, 1);
878 len = len + 1;
879 }
880 }
881 build_hip(skb->data, len, priv);
882 return skb;
883 } else {
884 /*
885 * compensate in the future if necessary
886 */
887 netdev_err(dev->net, "tx_fixup: no room for HIP\n");
888 } /* headroom */
889 }
890
891 if (!priv->link_up)
892 dev->net->stats.tx_carrier_errors++;
893
894 /* tx_dropped incremented by usbnet */
895
896 /* filter the packet out, release it */
897 dev_kfree_skb_any(skb);
898 return NULL;
899 }
900
901 static const struct driver_info sierra_net_info_direct_ip = {
902 .description = "Sierra Wireless USB-to-WWAN Modem",
903 .flags = FLAG_WWAN | FLAG_SEND_ZLP,
904 .bind = sierra_net_bind,
905 .unbind = sierra_net_unbind,
906 .status = sierra_net_status,
907 .rx_fixup = sierra_net_rx_fixup,
908 .tx_fixup = sierra_net_tx_fixup,
909 };
910
911 #define DIRECT_IP_DEVICE(vend, prod) \
912 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
913 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
914 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
915 .driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
916 {USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
917 .driver_info = (unsigned long)&sierra_net_info_direct_ip}
918
919 static const struct usb_device_id products[] = {
920 DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
921 DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
922 DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
923 DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
924
925 {}, /* last item */
926 };
927 MODULE_DEVICE_TABLE(usb, products);
928
929 /* We are based on usbnet, so let it handle the USB driver specifics */
930 static struct usb_driver sierra_net_driver = {
931 .name = "sierra_net",
932 .id_table = products,
933 .probe = usbnet_probe,
934 .disconnect = usbnet_disconnect,
935 .suspend = usbnet_suspend,
936 .resume = usbnet_resume,
937 .no_dynamic_id = 1,
938 .disable_hub_initiated_lpm = 1,
939 };
940
941 module_usb_driver(sierra_net_driver);
942
943 MODULE_AUTHOR(DRIVER_AUTHOR);
944 MODULE_DESCRIPTION(DRIVER_DESC);
945 MODULE_VERSION(DRIVER_VERSION);
946 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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