1 /* 2 * cdc_ncm.c 3 * 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> 7 * 8 * USB Host Driver for Network Control Model (NCM) 9 * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip 10 * 11 * The NCM encoding, decoding and initialization logic 12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h 13 * 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: 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 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. 27 * 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 38 * SUCH DAMAGE. 39 */ 40 41 #include <linux/module.h> 42 #include <linux/netdevice.h> 43 #include <linux/ctype.h> 44 #include <linux/ethtool.h> 45 #include <linux/workqueue.h> 46 #include <linux/mii.h> 47 #include <linux/crc32.h> 48 #include <linux/usb.h> 49 #include <linux/hrtimer.h> 50 #include <linux/atomic.h> 51 #include <linux/usb/usbnet.h> 52 #include <linux/usb/cdc.h> 53 #include <linux/usb/cdc_ncm.h> 54 55 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM) 56 static bool prefer_mbim = true; 57 #else 58 static bool prefer_mbim; 59 #endif 60 module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR); 61 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions"); 62 63 static void cdc_ncm_txpath_bh(unsigned long param); 64 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); 65 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); 66 static struct usb_driver cdc_ncm_driver; 67 68 struct cdc_ncm_stats { 69 char stat_string[ETH_GSTRING_LEN]; 70 int sizeof_stat; 71 int stat_offset; 72 }; 73 74 #define CDC_NCM_STAT(str, m) { \ 75 .stat_string = str, \ 76 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \ 77 .stat_offset = offsetof(struct cdc_ncm_ctx, m) } 78 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m) 79 80 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = { 81 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full), 82 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full), 83 CDC_NCM_SIMPLE_STAT(tx_reason_timeout), 84 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram), 85 CDC_NCM_SIMPLE_STAT(tx_overhead), 86 CDC_NCM_SIMPLE_STAT(tx_ntbs), 87 CDC_NCM_SIMPLE_STAT(rx_overhead), 88 CDC_NCM_SIMPLE_STAT(rx_ntbs), 89 }; 90 91 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset) 92 { 93 switch (sset) { 94 case ETH_SS_STATS: 95 return ARRAY_SIZE(cdc_ncm_gstrings_stats); 96 default: 97 return -EOPNOTSUPP; 98 } 99 } 100 101 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev, 102 struct ethtool_stats __always_unused *stats, 103 u64 *data) 104 { 105 struct usbnet *dev = netdev_priv(netdev); 106 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 107 int i; 108 char *p = NULL; 109 110 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 111 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset; 112 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p; 113 } 114 } 115 116 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data) 117 { 118 u8 *p = data; 119 int i; 120 121 switch (stringset) { 122 case ETH_SS_STATS: 123 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 124 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN); 125 p += ETH_GSTRING_LEN; 126 } 127 } 128 } 129 130 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx); 131 132 static const struct ethtool_ops cdc_ncm_ethtool_ops = { 133 .get_settings = usbnet_get_settings, 134 .set_settings = usbnet_set_settings, 135 .get_link = usbnet_get_link, 136 .nway_reset = usbnet_nway_reset, 137 .get_drvinfo = usbnet_get_drvinfo, 138 .get_msglevel = usbnet_get_msglevel, 139 .set_msglevel = usbnet_set_msglevel, 140 .get_ts_info = ethtool_op_get_ts_info, 141 .get_sset_count = cdc_ncm_get_sset_count, 142 .get_strings = cdc_ncm_get_strings, 143 .get_ethtool_stats = cdc_ncm_get_ethtool_stats, 144 }; 145 146 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx) 147 { 148 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 149 u32 val, max, min; 150 151 /* clamp new_rx to sane values */ 152 min = USB_CDC_NCM_NTB_MIN_IN_SIZE; 153 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 154 155 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */ 156 if (max < min) { 157 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n", 158 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min); 159 max = min; 160 } 161 162 val = clamp_t(u32, new_rx, min, max); 163 if (val != new_rx) 164 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max); 165 166 return val; 167 } 168 169 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx) 170 { 171 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 172 u32 val, max, min; 173 174 /* clamp new_tx to sane values */ 175 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16); 176 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 177 178 /* some devices set dwNtbOutMaxSize too low for the above default */ 179 min = min(min, max); 180 181 val = clamp_t(u32, new_tx, min, max); 182 if (val != new_tx) 183 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max); 184 185 return val; 186 } 187 188 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf) 189 { 190 struct usbnet *dev = netdev_priv(to_net_dev(d)); 191 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 192 193 return sprintf(buf, "%u\n", ctx->min_tx_pkt); 194 } 195 196 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf) 197 { 198 struct usbnet *dev = netdev_priv(to_net_dev(d)); 199 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 200 201 return sprintf(buf, "%u\n", ctx->rx_max); 202 } 203 204 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf) 205 { 206 struct usbnet *dev = netdev_priv(to_net_dev(d)); 207 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 208 209 return sprintf(buf, "%u\n", ctx->tx_max); 210 } 211 212 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf) 213 { 214 struct usbnet *dev = netdev_priv(to_net_dev(d)); 215 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 216 217 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC); 218 } 219 220 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 221 { 222 struct usbnet *dev = netdev_priv(to_net_dev(d)); 223 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 224 unsigned long val; 225 226 /* no need to restrict values - anything from 0 to infinity is OK */ 227 if (kstrtoul(buf, 0, &val)) 228 return -EINVAL; 229 230 ctx->min_tx_pkt = val; 231 return len; 232 } 233 234 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 235 { 236 struct usbnet *dev = netdev_priv(to_net_dev(d)); 237 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 238 unsigned long val; 239 240 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val) 241 return -EINVAL; 242 243 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max); 244 return len; 245 } 246 247 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 248 { 249 struct usbnet *dev = netdev_priv(to_net_dev(d)); 250 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 251 unsigned long val; 252 253 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val) 254 return -EINVAL; 255 256 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val); 257 return len; 258 } 259 260 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 261 { 262 struct usbnet *dev = netdev_priv(to_net_dev(d)); 263 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 264 ssize_t ret; 265 unsigned long val; 266 267 ret = kstrtoul(buf, 0, &val); 268 if (ret) 269 return ret; 270 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX)) 271 return -EINVAL; 272 273 spin_lock_bh(&ctx->mtx); 274 ctx->timer_interval = val * NSEC_PER_USEC; 275 if (!ctx->timer_interval) 276 ctx->tx_timer_pending = 0; 277 spin_unlock_bh(&ctx->mtx); 278 return len; 279 } 280 281 static DEVICE_ATTR(min_tx_pkt, S_IRUGO | S_IWUSR, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt); 282 static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max); 283 static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max); 284 static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs); 285 286 #define NCM_PARM_ATTR(name, format, tocpu) \ 287 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \ 288 { \ 289 struct usbnet *dev = netdev_priv(to_net_dev(d)); \ 290 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \ 291 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \ 292 } \ 293 static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL) 294 295 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu); 296 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu); 297 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu); 298 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu); 299 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu); 300 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu); 301 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu); 302 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu); 303 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu); 304 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu); 305 306 static struct attribute *cdc_ncm_sysfs_attrs[] = { 307 &dev_attr_min_tx_pkt.attr, 308 &dev_attr_rx_max.attr, 309 &dev_attr_tx_max.attr, 310 &dev_attr_tx_timer_usecs.attr, 311 &dev_attr_bmNtbFormatsSupported.attr, 312 &dev_attr_dwNtbInMaxSize.attr, 313 &dev_attr_wNdpInDivisor.attr, 314 &dev_attr_wNdpInPayloadRemainder.attr, 315 &dev_attr_wNdpInAlignment.attr, 316 &dev_attr_dwNtbOutMaxSize.attr, 317 &dev_attr_wNdpOutDivisor.attr, 318 &dev_attr_wNdpOutPayloadRemainder.attr, 319 &dev_attr_wNdpOutAlignment.attr, 320 &dev_attr_wNtbOutMaxDatagrams.attr, 321 NULL, 322 }; 323 324 static struct attribute_group cdc_ncm_sysfs_attr_group = { 325 .name = "cdc_ncm", 326 .attrs = cdc_ncm_sysfs_attrs, 327 }; 328 329 /* handle rx_max and tx_max changes */ 330 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx) 331 { 332 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 333 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 334 u32 val; 335 336 val = cdc_ncm_check_rx_max(dev, new_rx); 337 338 /* inform device about NTB input size changes */ 339 if (val != ctx->rx_max) { 340 __le32 dwNtbInMaxSize = cpu_to_le32(val); 341 342 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val); 343 344 /* tell device to use new size */ 345 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE, 346 USB_TYPE_CLASS | USB_DIR_OUT 347 | USB_RECIP_INTERFACE, 348 0, iface_no, &dwNtbInMaxSize, 4) < 0) 349 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n"); 350 else 351 ctx->rx_max = val; 352 } 353 354 /* usbnet use these values for sizing rx queues */ 355 if (dev->rx_urb_size != ctx->rx_max) { 356 dev->rx_urb_size = ctx->rx_max; 357 if (netif_running(dev->net)) 358 usbnet_unlink_rx_urbs(dev); 359 } 360 361 val = cdc_ncm_check_tx_max(dev, new_tx); 362 if (val != ctx->tx_max) 363 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val); 364 365 /* Adding a pad byte here if necessary simplifies the handling 366 * in cdc_ncm_fill_tx_frame, making tx_max always represent 367 * the real skb max size. 368 * 369 * We cannot use dev->maxpacket here because this is called from 370 * .bind which is called before usbnet sets up dev->maxpacket 371 */ 372 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) && 373 val % usb_maxpacket(dev->udev, dev->out, 1) == 0) 374 val++; 375 376 /* we might need to flush any pending tx buffers if running */ 377 if (netif_running(dev->net) && val > ctx->tx_max) { 378 netif_tx_lock_bh(dev->net); 379 usbnet_start_xmit(NULL, dev->net); 380 /* make sure tx_curr_skb is reallocated if it was empty */ 381 if (ctx->tx_curr_skb) { 382 dev_kfree_skb_any(ctx->tx_curr_skb); 383 ctx->tx_curr_skb = NULL; 384 } 385 ctx->tx_max = val; 386 netif_tx_unlock_bh(dev->net); 387 } else { 388 ctx->tx_max = val; 389 } 390 391 dev->hard_mtu = ctx->tx_max; 392 393 /* max qlen depend on hard_mtu and rx_urb_size */ 394 usbnet_update_max_qlen(dev); 395 396 /* never pad more than 3 full USB packets per transfer */ 397 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1), 398 CDC_NCM_MIN_TX_PKT, ctx->tx_max); 399 } 400 401 /* helpers for NCM and MBIM differences */ 402 static u8 cdc_ncm_flags(struct usbnet *dev) 403 { 404 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 405 406 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 407 return ctx->mbim_desc->bmNetworkCapabilities; 408 if (ctx->func_desc) 409 return ctx->func_desc->bmNetworkCapabilities; 410 return 0; 411 } 412 413 static int cdc_ncm_eth_hlen(struct usbnet *dev) 414 { 415 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 416 return 0; 417 return ETH_HLEN; 418 } 419 420 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev) 421 { 422 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 423 return CDC_MBIM_MIN_DATAGRAM_SIZE; 424 return CDC_NCM_MIN_DATAGRAM_SIZE; 425 } 426 427 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev) 428 { 429 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 430 431 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 432 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize); 433 if (ctx->ether_desc) 434 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); 435 return CDC_NCM_MAX_DATAGRAM_SIZE; 436 } 437 438 /* initial one-time device setup. MUST be called with the data interface 439 * in altsetting 0 440 */ 441 static int cdc_ncm_init(struct usbnet *dev) 442 { 443 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 444 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 445 int err; 446 447 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS, 448 USB_TYPE_CLASS | USB_DIR_IN 449 |USB_RECIP_INTERFACE, 450 0, iface_no, &ctx->ncm_parm, 451 sizeof(ctx->ncm_parm)); 452 if (err < 0) { 453 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n"); 454 return err; /* GET_NTB_PARAMETERS is required */ 455 } 456 457 /* set CRC Mode */ 458 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) { 459 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n"); 460 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE, 461 USB_TYPE_CLASS | USB_DIR_OUT 462 | USB_RECIP_INTERFACE, 463 USB_CDC_NCM_CRC_NOT_APPENDED, 464 iface_no, NULL, 0); 465 if (err < 0) 466 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n"); 467 } 468 469 /* set NTB format, if both formats are supported. 470 * 471 * "The host shall only send this command while the NCM Data 472 * Interface is in alternate setting 0." 473 */ 474 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) & 475 USB_CDC_NCM_NTB32_SUPPORTED) { 476 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n"); 477 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT, 478 USB_TYPE_CLASS | USB_DIR_OUT 479 | USB_RECIP_INTERFACE, 480 USB_CDC_NCM_NTB16_FORMAT, 481 iface_no, NULL, 0); 482 if (err < 0) 483 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n"); 484 } 485 486 /* set initial device values */ 487 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); 488 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); 489 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); 490 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); 491 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); 492 /* devices prior to NCM Errata shall set this field to zero */ 493 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); 494 495 dev_dbg(&dev->intf->dev, 496 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", 497 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, 498 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev)); 499 500 /* max count of tx datagrams */ 501 if ((ctx->tx_max_datagrams == 0) || 502 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) 503 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; 504 505 /* set up maximum NDP size */ 506 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16); 507 508 /* initial coalescing timer interval */ 509 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC; 510 511 return 0; 512 } 513 514 /* set a new max datagram size */ 515 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size) 516 { 517 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 518 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 519 __le16 max_datagram_size; 520 u16 mbim_mtu; 521 int err; 522 523 /* set default based on descriptors */ 524 ctx->max_datagram_size = clamp_t(u32, new_size, 525 cdc_ncm_min_dgram_size(dev), 526 CDC_NCM_MAX_DATAGRAM_SIZE); 527 528 /* inform the device about the selected Max Datagram Size? */ 529 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE)) 530 goto out; 531 532 /* read current mtu value from device */ 533 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE, 534 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE, 535 0, iface_no, &max_datagram_size, 2); 536 if (err < 0) { 537 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n"); 538 goto out; 539 } 540 541 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size) 542 goto out; 543 544 max_datagram_size = cpu_to_le16(ctx->max_datagram_size); 545 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE, 546 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE, 547 0, iface_no, &max_datagram_size, 2); 548 if (err < 0) 549 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n"); 550 551 out: 552 /* set MTU to max supported by the device if necessary */ 553 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev)); 554 555 /* do not exceed operater preferred MTU */ 556 if (ctx->mbim_extended_desc) { 557 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU); 558 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu) 559 dev->net->mtu = mbim_mtu; 560 } 561 } 562 563 static void cdc_ncm_fix_modulus(struct usbnet *dev) 564 { 565 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 566 u32 val; 567 568 /* 569 * verify that the structure alignment is: 570 * - power of two 571 * - not greater than the maximum transmit length 572 * - not less than four bytes 573 */ 574 val = ctx->tx_ndp_modulus; 575 576 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 577 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 578 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n"); 579 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 580 } 581 582 /* 583 * verify that the payload alignment is: 584 * - power of two 585 * - not greater than the maximum transmit length 586 * - not less than four bytes 587 */ 588 val = ctx->tx_modulus; 589 590 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 591 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 592 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n"); 593 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 594 } 595 596 /* verify the payload remainder */ 597 if (ctx->tx_remainder >= ctx->tx_modulus) { 598 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n"); 599 ctx->tx_remainder = 0; 600 } 601 602 /* adjust TX-remainder according to NCM specification. */ 603 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) & 604 (ctx->tx_modulus - 1)); 605 } 606 607 static int cdc_ncm_setup(struct usbnet *dev) 608 { 609 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 610 u32 def_rx, def_tx; 611 612 /* be conservative when selecting intial buffer size to 613 * increase the number of hosts this will work for 614 */ 615 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX, 616 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 617 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX, 618 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 619 620 /* clamp rx_max and tx_max and inform device */ 621 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx); 622 623 /* sanitize the modulus and remainder values */ 624 cdc_ncm_fix_modulus(dev); 625 626 /* set max datagram size */ 627 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev)); 628 return 0; 629 } 630 631 static void 632 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf) 633 { 634 struct usb_host_endpoint *e, *in = NULL, *out = NULL; 635 u8 ep; 636 637 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { 638 639 e = intf->cur_altsetting->endpoint + ep; 640 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 641 case USB_ENDPOINT_XFER_INT: 642 if (usb_endpoint_dir_in(&e->desc)) { 643 if (!dev->status) 644 dev->status = e; 645 } 646 break; 647 648 case USB_ENDPOINT_XFER_BULK: 649 if (usb_endpoint_dir_in(&e->desc)) { 650 if (!in) 651 in = e; 652 } else { 653 if (!out) 654 out = e; 655 } 656 break; 657 658 default: 659 break; 660 } 661 } 662 if (in && !dev->in) 663 dev->in = usb_rcvbulkpipe(dev->udev, 664 in->desc.bEndpointAddress & 665 USB_ENDPOINT_NUMBER_MASK); 666 if (out && !dev->out) 667 dev->out = usb_sndbulkpipe(dev->udev, 668 out->desc.bEndpointAddress & 669 USB_ENDPOINT_NUMBER_MASK); 670 } 671 672 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) 673 { 674 if (ctx == NULL) 675 return; 676 677 if (ctx->tx_rem_skb != NULL) { 678 dev_kfree_skb_any(ctx->tx_rem_skb); 679 ctx->tx_rem_skb = NULL; 680 } 681 682 if (ctx->tx_curr_skb != NULL) { 683 dev_kfree_skb_any(ctx->tx_curr_skb); 684 ctx->tx_curr_skb = NULL; 685 } 686 687 kfree(ctx->delayed_ndp16); 688 689 kfree(ctx); 690 } 691 692 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags) 693 { 694 struct cdc_ncm_ctx *ctx; 695 struct usb_driver *driver; 696 u8 *buf; 697 int len; 698 int temp; 699 u8 iface_no; 700 struct usb_cdc_parsed_header hdr; 701 702 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 703 if (!ctx) 704 return -ENOMEM; 705 706 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 707 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; 708 ctx->bh.data = (unsigned long)dev; 709 ctx->bh.func = cdc_ncm_txpath_bh; 710 atomic_set(&ctx->stop, 0); 711 spin_lock_init(&ctx->mtx); 712 713 /* store ctx pointer in device data field */ 714 dev->data[0] = (unsigned long)ctx; 715 716 /* only the control interface can be successfully probed */ 717 ctx->control = intf; 718 719 /* get some pointers */ 720 driver = driver_of(intf); 721 buf = intf->cur_altsetting->extra; 722 len = intf->cur_altsetting->extralen; 723 724 /* parse through descriptors associated with control interface */ 725 cdc_parse_cdc_header(&hdr, intf, buf, len); 726 727 if (hdr.usb_cdc_union_desc) 728 ctx->data = usb_ifnum_to_if(dev->udev, 729 hdr.usb_cdc_union_desc->bSlaveInterface0); 730 ctx->ether_desc = hdr.usb_cdc_ether_desc; 731 ctx->func_desc = hdr.usb_cdc_ncm_desc; 732 ctx->mbim_desc = hdr.usb_cdc_mbim_desc; 733 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc; 734 735 /* some buggy devices have an IAD but no CDC Union */ 736 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) { 737 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1); 738 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n"); 739 } 740 741 /* check if we got everything */ 742 if (!ctx->data) { 743 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n"); 744 goto error; 745 } 746 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) { 747 if (!ctx->mbim_desc) { 748 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n"); 749 goto error; 750 } 751 } else { 752 if (!ctx->ether_desc || !ctx->func_desc) { 753 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n"); 754 goto error; 755 } 756 } 757 758 /* claim data interface, if different from control */ 759 if (ctx->data != ctx->control) { 760 temp = usb_driver_claim_interface(driver, ctx->data, dev); 761 if (temp) { 762 dev_dbg(&intf->dev, "failed to claim data intf\n"); 763 goto error; 764 } 765 } 766 767 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; 768 769 /* reset data interface */ 770 temp = usb_set_interface(dev->udev, iface_no, 0); 771 if (temp) { 772 dev_dbg(&intf->dev, "set interface failed\n"); 773 goto error2; 774 } 775 776 /* initialize basic device settings */ 777 if (cdc_ncm_init(dev)) 778 goto error2; 779 780 /* configure data interface */ 781 temp = usb_set_interface(dev->udev, iface_no, data_altsetting); 782 if (temp) { 783 dev_dbg(&intf->dev, "set interface failed\n"); 784 goto error2; 785 } 786 787 cdc_ncm_find_endpoints(dev, ctx->data); 788 cdc_ncm_find_endpoints(dev, ctx->control); 789 if (!dev->in || !dev->out || !dev->status) { 790 dev_dbg(&intf->dev, "failed to collect endpoints\n"); 791 goto error2; 792 } 793 794 usb_set_intfdata(ctx->data, dev); 795 usb_set_intfdata(ctx->control, dev); 796 797 if (ctx->ether_desc) { 798 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); 799 if (temp) { 800 dev_dbg(&intf->dev, "failed to get mac address\n"); 801 goto error2; 802 } 803 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr); 804 } 805 806 /* finish setting up the device specific data */ 807 cdc_ncm_setup(dev); 808 809 /* Device-specific flags */ 810 ctx->drvflags = drvflags; 811 812 /* Allocate the delayed NDP if needed. */ 813 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 814 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL); 815 if (!ctx->delayed_ndp16) 816 goto error2; 817 dev_info(&intf->dev, "NDP will be placed at end of frame for this device."); 818 } 819 820 /* override ethtool_ops */ 821 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; 822 823 /* add our sysfs attrs */ 824 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group; 825 826 return 0; 827 828 error2: 829 usb_set_intfdata(ctx->control, NULL); 830 usb_set_intfdata(ctx->data, NULL); 831 if (ctx->data != ctx->control) 832 usb_driver_release_interface(driver, ctx->data); 833 error: 834 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); 835 dev->data[0] = 0; 836 dev_info(&intf->dev, "bind() failure\n"); 837 return -ENODEV; 838 } 839 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common); 840 841 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) 842 { 843 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 844 struct usb_driver *driver = driver_of(intf); 845 846 if (ctx == NULL) 847 return; /* no setup */ 848 849 atomic_set(&ctx->stop, 1); 850 851 if (hrtimer_active(&ctx->tx_timer)) 852 hrtimer_cancel(&ctx->tx_timer); 853 854 tasklet_kill(&ctx->bh); 855 856 /* handle devices with combined control and data interface */ 857 if (ctx->control == ctx->data) 858 ctx->data = NULL; 859 860 /* disconnect master --> disconnect slave */ 861 if (intf == ctx->control && ctx->data) { 862 usb_set_intfdata(ctx->data, NULL); 863 usb_driver_release_interface(driver, ctx->data); 864 ctx->data = NULL; 865 866 } else if (intf == ctx->data && ctx->control) { 867 usb_set_intfdata(ctx->control, NULL); 868 usb_driver_release_interface(driver, ctx->control); 869 ctx->control = NULL; 870 } 871 872 usb_set_intfdata(intf, NULL); 873 cdc_ncm_free(ctx); 874 } 875 EXPORT_SYMBOL_GPL(cdc_ncm_unbind); 876 877 /* Return the number of the MBIM control interface altsetting iff it 878 * is preferred and available, 879 */ 880 u8 cdc_ncm_select_altsetting(struct usb_interface *intf) 881 { 882 struct usb_host_interface *alt; 883 884 /* The MBIM spec defines a NCM compatible default altsetting, 885 * which we may have matched: 886 * 887 * "Functions that implement both NCM 1.0 and MBIM (an 888 * “NCM/MBIM function”) according to this recommendation 889 * shall provide two alternate settings for the 890 * Communication Interface. Alternate setting 0, and the 891 * associated class and endpoint descriptors, shall be 892 * constructed according to the rules given for the 893 * Communication Interface in section 5 of [USBNCM10]. 894 * Alternate setting 1, and the associated class and 895 * endpoint descriptors, shall be constructed according to 896 * the rules given in section 6 (USB Device Model) of this 897 * specification." 898 */ 899 if (intf->num_altsetting < 2) 900 return intf->cur_altsetting->desc.bAlternateSetting; 901 902 if (prefer_mbim) { 903 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM); 904 if (alt && cdc_ncm_comm_intf_is_mbim(alt)) 905 return CDC_NCM_COMM_ALTSETTING_MBIM; 906 } 907 return CDC_NCM_COMM_ALTSETTING_NCM; 908 } 909 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting); 910 911 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) 912 { 913 int ret; 914 915 /* MBIM backwards compatible function? */ 916 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM) 917 return -ENODEV; 918 919 /* The NCM data altsetting is fixed, so we hard-coded it. 920 * Additionally, generic NCM devices are assumed to accept arbitrarily 921 * placed NDP. 922 */ 923 ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0); 924 925 /* 926 * We should get an event when network connection is "connected" or 927 * "disconnected". Set network connection in "disconnected" state 928 * (carrier is OFF) during attach, so the IP network stack does not 929 * start IPv6 negotiation and more. 930 */ 931 usbnet_link_change(dev, 0, 0); 932 return ret; 933 } 934 935 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max) 936 { 937 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder; 938 939 if (skb->len + align > max) 940 align = max - skb->len; 941 if (align && skb_tailroom(skb) >= align) 942 memset(skb_put(skb, align), 0, align); 943 } 944 945 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly 946 * allocating a new one within skb 947 */ 948 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) 949 { 950 struct usb_cdc_ncm_ndp16 *ndp16 = NULL; 951 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data; 952 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex); 953 954 /* If NDP should be moved to the end of the NCM package, we can't follow the 955 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and 956 * the wNdpIndex field in the header is actually not consistent with reality. It will be later. 957 */ 958 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 959 if (ctx->delayed_ndp16->dwSignature == sign) 960 return ctx->delayed_ndp16; 961 962 /* We can only push a single NDP to the end. Return 963 * NULL to send what we've already got and queue this 964 * skb for later. 965 */ 966 else if (ctx->delayed_ndp16->dwSignature) 967 return NULL; 968 } 969 970 /* follow the chain of NDPs, looking for a match */ 971 while (ndpoffset) { 972 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset); 973 if (ndp16->dwSignature == sign) 974 return ndp16; 975 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 976 } 977 978 /* align new NDP */ 979 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 980 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max); 981 982 /* verify that there is room for the NDP and the datagram (reserve) */ 983 if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size) 984 return NULL; 985 986 /* link to it */ 987 if (ndp16) 988 ndp16->wNextNdpIndex = cpu_to_le16(skb->len); 989 else 990 nth16->wNdpIndex = cpu_to_le16(skb->len); 991 992 /* push a new empty NDP */ 993 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 994 ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size); 995 else 996 ndp16 = ctx->delayed_ndp16; 997 998 ndp16->dwSignature = sign; 999 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16)); 1000 return ndp16; 1001 } 1002 1003 struct sk_buff * 1004 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign) 1005 { 1006 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1007 struct usb_cdc_ncm_nth16 *nth16; 1008 struct usb_cdc_ncm_ndp16 *ndp16; 1009 struct sk_buff *skb_out; 1010 u16 n = 0, index, ndplen; 1011 u8 ready2send = 0; 1012 u32 delayed_ndp_size; 1013 1014 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated 1015 * accordingly. Otherwise, we should check here. 1016 */ 1017 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) 1018 delayed_ndp_size = ctx->max_ndp_size; 1019 else 1020 delayed_ndp_size = 0; 1021 1022 /* if there is a remaining skb, it gets priority */ 1023 if (skb != NULL) { 1024 swap(skb, ctx->tx_rem_skb); 1025 swap(sign, ctx->tx_rem_sign); 1026 } else { 1027 ready2send = 1; 1028 } 1029 1030 /* check if we are resuming an OUT skb */ 1031 skb_out = ctx->tx_curr_skb; 1032 1033 /* allocate a new OUT skb */ 1034 if (!skb_out) { 1035 skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC); 1036 if (skb_out == NULL) { 1037 if (skb != NULL) { 1038 dev_kfree_skb_any(skb); 1039 dev->net->stats.tx_dropped++; 1040 } 1041 goto exit_no_skb; 1042 } 1043 /* fill out the initial 16-bit NTB header */ 1044 nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16)); 1045 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); 1046 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)); 1047 nth16->wSequence = cpu_to_le16(ctx->tx_seq++); 1048 1049 /* count total number of frames in this NTB */ 1050 ctx->tx_curr_frame_num = 0; 1051 1052 /* recent payload counter for this skb_out */ 1053 ctx->tx_curr_frame_payload = 0; 1054 } 1055 1056 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) { 1057 /* send any remaining skb first */ 1058 if (skb == NULL) { 1059 skb = ctx->tx_rem_skb; 1060 sign = ctx->tx_rem_sign; 1061 ctx->tx_rem_skb = NULL; 1062 1063 /* check for end of skb */ 1064 if (skb == NULL) 1065 break; 1066 } 1067 1068 /* get the appropriate NDP for this skb */ 1069 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); 1070 1071 /* align beginning of next frame */ 1072 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max); 1073 1074 /* check if we had enough room left for both NDP and frame */ 1075 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_max) { 1076 if (n == 0) { 1077 /* won't fit, MTU problem? */ 1078 dev_kfree_skb_any(skb); 1079 skb = NULL; 1080 dev->net->stats.tx_dropped++; 1081 } else { 1082 /* no room for skb - store for later */ 1083 if (ctx->tx_rem_skb != NULL) { 1084 dev_kfree_skb_any(ctx->tx_rem_skb); 1085 dev->net->stats.tx_dropped++; 1086 } 1087 ctx->tx_rem_skb = skb; 1088 ctx->tx_rem_sign = sign; 1089 skb = NULL; 1090 ready2send = 1; 1091 ctx->tx_reason_ntb_full++; /* count reason for transmitting */ 1092 } 1093 break; 1094 } 1095 1096 /* calculate frame number withing this NDP */ 1097 ndplen = le16_to_cpu(ndp16->wLength); 1098 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1; 1099 1100 /* OK, add this skb */ 1101 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len); 1102 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len); 1103 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16)); 1104 memcpy(skb_put(skb_out, skb->len), skb->data, skb->len); 1105 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */ 1106 dev_kfree_skb_any(skb); 1107 skb = NULL; 1108 1109 /* send now if this NDP is full */ 1110 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) { 1111 ready2send = 1; 1112 ctx->tx_reason_ndp_full++; /* count reason for transmitting */ 1113 break; 1114 } 1115 } 1116 1117 /* free up any dangling skb */ 1118 if (skb != NULL) { 1119 dev_kfree_skb_any(skb); 1120 skb = NULL; 1121 dev->net->stats.tx_dropped++; 1122 } 1123 1124 ctx->tx_curr_frame_num = n; 1125 1126 if (n == 0) { 1127 /* wait for more frames */ 1128 /* push variables */ 1129 ctx->tx_curr_skb = skb_out; 1130 goto exit_no_skb; 1131 1132 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) { 1133 /* wait for more frames */ 1134 /* push variables */ 1135 ctx->tx_curr_skb = skb_out; 1136 /* set the pending count */ 1137 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) 1138 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; 1139 goto exit_no_skb; 1140 1141 } else { 1142 if (n == ctx->tx_max_datagrams) 1143 ctx->tx_reason_max_datagram++; /* count reason for transmitting */ 1144 /* frame goes out */ 1145 /* variables will be reset at next call */ 1146 } 1147 1148 /* If requested, put NDP at end of frame. */ 1149 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 1150 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 1151 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_max); 1152 nth16->wNdpIndex = cpu_to_le16(skb_out->len); 1153 memcpy(skb_put(skb_out, ctx->max_ndp_size), ctx->delayed_ndp16, ctx->max_ndp_size); 1154 1155 /* Zero out delayed NDP - signature checking will naturally fail. */ 1156 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size); 1157 } 1158 1159 /* If collected data size is less or equal ctx->min_tx_pkt 1160 * bytes, we send buffers as it is. If we get more data, it 1161 * would be more efficient for USB HS mobile device with DMA 1162 * engine to receive a full size NTB, than canceling DMA 1163 * transfer and receiving a short packet. 1164 * 1165 * This optimization support is pointless if we end up sending 1166 * a ZLP after full sized NTBs. 1167 */ 1168 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) && 1169 skb_out->len > ctx->min_tx_pkt) 1170 memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0, 1171 ctx->tx_max - skb_out->len); 1172 else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0) 1173 *skb_put(skb_out, 1) = 0; /* force short packet */ 1174 1175 /* set final frame length */ 1176 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 1177 nth16->wBlockLength = cpu_to_le16(skb_out->len); 1178 1179 /* return skb */ 1180 ctx->tx_curr_skb = NULL; 1181 1182 /* keep private stats: framing overhead and number of NTBs */ 1183 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload; 1184 ctx->tx_ntbs++; 1185 1186 /* usbnet will count all the framing overhead by default. 1187 * Adjust the stats so that the tx_bytes counter show real 1188 * payload data instead. 1189 */ 1190 usbnet_set_skb_tx_stats(skb_out, n, 1191 (long)ctx->tx_curr_frame_payload - skb_out->len); 1192 1193 return skb_out; 1194 1195 exit_no_skb: 1196 /* Start timer, if there is a remaining non-empty skb */ 1197 if (ctx->tx_curr_skb != NULL && n > 0) 1198 cdc_ncm_tx_timeout_start(ctx); 1199 return NULL; 1200 } 1201 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame); 1202 1203 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) 1204 { 1205 /* start timer, if not already started */ 1206 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) 1207 hrtimer_start(&ctx->tx_timer, 1208 ktime_set(0, ctx->timer_interval), 1209 HRTIMER_MODE_REL); 1210 } 1211 1212 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) 1213 { 1214 struct cdc_ncm_ctx *ctx = 1215 container_of(timer, struct cdc_ncm_ctx, tx_timer); 1216 1217 if (!atomic_read(&ctx->stop)) 1218 tasklet_schedule(&ctx->bh); 1219 return HRTIMER_NORESTART; 1220 } 1221 1222 static void cdc_ncm_txpath_bh(unsigned long param) 1223 { 1224 struct usbnet *dev = (struct usbnet *)param; 1225 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1226 1227 spin_lock_bh(&ctx->mtx); 1228 if (ctx->tx_timer_pending != 0) { 1229 ctx->tx_timer_pending--; 1230 cdc_ncm_tx_timeout_start(ctx); 1231 spin_unlock_bh(&ctx->mtx); 1232 } else if (dev->net != NULL) { 1233 ctx->tx_reason_timeout++; /* count reason for transmitting */ 1234 spin_unlock_bh(&ctx->mtx); 1235 netif_tx_lock_bh(dev->net); 1236 usbnet_start_xmit(NULL, dev->net); 1237 netif_tx_unlock_bh(dev->net); 1238 } else { 1239 spin_unlock_bh(&ctx->mtx); 1240 } 1241 } 1242 1243 struct sk_buff * 1244 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) 1245 { 1246 struct sk_buff *skb_out; 1247 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1248 1249 /* 1250 * The Ethernet API we are using does not support transmitting 1251 * multiple Ethernet frames in a single call. This driver will 1252 * accumulate multiple Ethernet frames and send out a larger 1253 * USB frame when the USB buffer is full or when a single jiffies 1254 * timeout happens. 1255 */ 1256 if (ctx == NULL) 1257 goto error; 1258 1259 spin_lock_bh(&ctx->mtx); 1260 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)); 1261 spin_unlock_bh(&ctx->mtx); 1262 return skb_out; 1263 1264 error: 1265 if (skb != NULL) 1266 dev_kfree_skb_any(skb); 1267 1268 return NULL; 1269 } 1270 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup); 1271 1272 /* verify NTB header and return offset of first NDP, or negative error */ 1273 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) 1274 { 1275 struct usbnet *dev = netdev_priv(skb_in->dev); 1276 struct usb_cdc_ncm_nth16 *nth16; 1277 int len; 1278 int ret = -EINVAL; 1279 1280 if (ctx == NULL) 1281 goto error; 1282 1283 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + 1284 sizeof(struct usb_cdc_ncm_ndp16))) { 1285 netif_dbg(dev, rx_err, dev->net, "frame too short\n"); 1286 goto error; 1287 } 1288 1289 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; 1290 1291 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) { 1292 netif_dbg(dev, rx_err, dev->net, 1293 "invalid NTH16 signature <%#010x>\n", 1294 le32_to_cpu(nth16->dwSignature)); 1295 goto error; 1296 } 1297 1298 len = le16_to_cpu(nth16->wBlockLength); 1299 if (len > ctx->rx_max) { 1300 netif_dbg(dev, rx_err, dev->net, 1301 "unsupported NTB block length %u/%u\n", len, 1302 ctx->rx_max); 1303 goto error; 1304 } 1305 1306 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && 1307 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && 1308 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { 1309 netif_dbg(dev, rx_err, dev->net, 1310 "sequence number glitch prev=%d curr=%d\n", 1311 ctx->rx_seq, le16_to_cpu(nth16->wSequence)); 1312 } 1313 ctx->rx_seq = le16_to_cpu(nth16->wSequence); 1314 1315 ret = le16_to_cpu(nth16->wNdpIndex); 1316 error: 1317 return ret; 1318 } 1319 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16); 1320 1321 /* verify NDP header and return number of datagrams, or negative error */ 1322 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset) 1323 { 1324 struct usbnet *dev = netdev_priv(skb_in->dev); 1325 struct usb_cdc_ncm_ndp16 *ndp16; 1326 int ret = -EINVAL; 1327 1328 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { 1329 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n", 1330 ndpoffset); 1331 goto error; 1332 } 1333 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1334 1335 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { 1336 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n", 1337 le16_to_cpu(ndp16->wLength)); 1338 goto error; 1339 } 1340 1341 ret = ((le16_to_cpu(ndp16->wLength) - 1342 sizeof(struct usb_cdc_ncm_ndp16)) / 1343 sizeof(struct usb_cdc_ncm_dpe16)); 1344 ret--; /* we process NDP entries except for the last one */ 1345 1346 if ((sizeof(struct usb_cdc_ncm_ndp16) + 1347 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) { 1348 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret); 1349 ret = -EINVAL; 1350 } 1351 1352 error: 1353 return ret; 1354 } 1355 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16); 1356 1357 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) 1358 { 1359 struct sk_buff *skb; 1360 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1361 int len; 1362 int nframes; 1363 int x; 1364 int offset; 1365 struct usb_cdc_ncm_ndp16 *ndp16; 1366 struct usb_cdc_ncm_dpe16 *dpe16; 1367 int ndpoffset; 1368 int loopcount = 50; /* arbitrary max preventing infinite loop */ 1369 u32 payload = 0; 1370 1371 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); 1372 if (ndpoffset < 0) 1373 goto error; 1374 1375 next_ndp: 1376 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); 1377 if (nframes < 0) 1378 goto error; 1379 1380 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1381 1382 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) { 1383 netif_dbg(dev, rx_err, dev->net, 1384 "invalid DPT16 signature <%#010x>\n", 1385 le32_to_cpu(ndp16->dwSignature)); 1386 goto err_ndp; 1387 } 1388 dpe16 = ndp16->dpe16; 1389 1390 for (x = 0; x < nframes; x++, dpe16++) { 1391 offset = le16_to_cpu(dpe16->wDatagramIndex); 1392 len = le16_to_cpu(dpe16->wDatagramLength); 1393 1394 /* 1395 * CDC NCM ch. 3.7 1396 * All entries after first NULL entry are to be ignored 1397 */ 1398 if ((offset == 0) || (len == 0)) { 1399 if (!x) 1400 goto err_ndp; /* empty NTB */ 1401 break; 1402 } 1403 1404 /* sanity checking */ 1405 if (((offset + len) > skb_in->len) || 1406 (len > ctx->rx_max) || (len < ETH_HLEN)) { 1407 netif_dbg(dev, rx_err, dev->net, 1408 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n", 1409 x, offset, len, skb_in); 1410 if (!x) 1411 goto err_ndp; 1412 break; 1413 1414 } else { 1415 /* create a fresh copy to reduce truesize */ 1416 skb = netdev_alloc_skb_ip_align(dev->net, len); 1417 if (!skb) 1418 goto error; 1419 memcpy(skb_put(skb, len), skb_in->data + offset, len); 1420 usbnet_skb_return(dev, skb); 1421 payload += len; /* count payload bytes in this NTB */ 1422 } 1423 } 1424 err_ndp: 1425 /* are there more NDPs to process? */ 1426 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 1427 if (ndpoffset && loopcount--) 1428 goto next_ndp; 1429 1430 /* update stats */ 1431 ctx->rx_overhead += skb_in->len - payload; 1432 ctx->rx_ntbs++; 1433 1434 return 1; 1435 error: 1436 return 0; 1437 } 1438 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup); 1439 1440 static void 1441 cdc_ncm_speed_change(struct usbnet *dev, 1442 struct usb_cdc_speed_change *data) 1443 { 1444 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); 1445 uint32_t tx_speed = le32_to_cpu(data->ULBitRate); 1446 1447 /* 1448 * Currently the USB-NET API does not support reporting the actual 1449 * device speed. Do print it instead. 1450 */ 1451 if ((tx_speed > 1000000) && (rx_speed > 1000000)) { 1452 netif_info(dev, link, dev->net, 1453 "%u mbit/s downlink %u mbit/s uplink\n", 1454 (unsigned int)(rx_speed / 1000000U), 1455 (unsigned int)(tx_speed / 1000000U)); 1456 } else { 1457 netif_info(dev, link, dev->net, 1458 "%u kbit/s downlink %u kbit/s uplink\n", 1459 (unsigned int)(rx_speed / 1000U), 1460 (unsigned int)(tx_speed / 1000U)); 1461 } 1462 } 1463 1464 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) 1465 { 1466 struct cdc_ncm_ctx *ctx; 1467 struct usb_cdc_notification *event; 1468 1469 ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1470 1471 if (urb->actual_length < sizeof(*event)) 1472 return; 1473 1474 /* test for split data in 8-byte chunks */ 1475 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { 1476 cdc_ncm_speed_change(dev, 1477 (struct usb_cdc_speed_change *)urb->transfer_buffer); 1478 return; 1479 } 1480 1481 event = urb->transfer_buffer; 1482 1483 switch (event->bNotificationType) { 1484 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 1485 /* 1486 * According to the CDC NCM specification ch.7.1 1487 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be 1488 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. 1489 */ 1490 netif_info(dev, link, dev->net, 1491 "network connection: %sconnected\n", 1492 !!event->wValue ? "" : "dis"); 1493 usbnet_link_change(dev, !!event->wValue, 0); 1494 break; 1495 1496 case USB_CDC_NOTIFY_SPEED_CHANGE: 1497 if (urb->actual_length < (sizeof(*event) + 1498 sizeof(struct usb_cdc_speed_change))) 1499 set_bit(EVENT_STS_SPLIT, &dev->flags); 1500 else 1501 cdc_ncm_speed_change(dev, 1502 (struct usb_cdc_speed_change *)&event[1]); 1503 break; 1504 1505 default: 1506 dev_dbg(&dev->udev->dev, 1507 "NCM: unexpected notification 0x%02x!\n", 1508 event->bNotificationType); 1509 break; 1510 } 1511 } 1512 1513 static const struct driver_info cdc_ncm_info = { 1514 .description = "CDC NCM", 1515 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, 1516 .bind = cdc_ncm_bind, 1517 .unbind = cdc_ncm_unbind, 1518 .manage_power = usbnet_manage_power, 1519 .status = cdc_ncm_status, 1520 .rx_fixup = cdc_ncm_rx_fixup, 1521 .tx_fixup = cdc_ncm_tx_fixup, 1522 }; 1523 1524 /* Same as cdc_ncm_info, but with FLAG_WWAN */ 1525 static const struct driver_info wwan_info = { 1526 .description = "Mobile Broadband Network Device", 1527 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1528 | FLAG_WWAN, 1529 .bind = cdc_ncm_bind, 1530 .unbind = cdc_ncm_unbind, 1531 .manage_power = usbnet_manage_power, 1532 .status = cdc_ncm_status, 1533 .rx_fixup = cdc_ncm_rx_fixup, 1534 .tx_fixup = cdc_ncm_tx_fixup, 1535 }; 1536 1537 /* Same as wwan_info, but with FLAG_NOARP */ 1538 static const struct driver_info wwan_noarp_info = { 1539 .description = "Mobile Broadband Network Device (NO ARP)", 1540 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1541 | FLAG_WWAN | FLAG_NOARP, 1542 .bind = cdc_ncm_bind, 1543 .unbind = cdc_ncm_unbind, 1544 .manage_power = usbnet_manage_power, 1545 .status = cdc_ncm_status, 1546 .rx_fixup = cdc_ncm_rx_fixup, 1547 .tx_fixup = cdc_ncm_tx_fixup, 1548 }; 1549 1550 static const struct usb_device_id cdc_devs[] = { 1551 /* Ericsson MBM devices like F5521gw */ 1552 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1553 | USB_DEVICE_ID_MATCH_VENDOR, 1554 .idVendor = 0x0bdb, 1555 .bInterfaceClass = USB_CLASS_COMM, 1556 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1557 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1558 .driver_info = (unsigned long) &wwan_info, 1559 }, 1560 1561 /* Dell branded MBM devices like DW5550 */ 1562 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1563 | USB_DEVICE_ID_MATCH_VENDOR, 1564 .idVendor = 0x413c, 1565 .bInterfaceClass = USB_CLASS_COMM, 1566 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1567 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1568 .driver_info = (unsigned long) &wwan_info, 1569 }, 1570 1571 /* Toshiba branded MBM devices */ 1572 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1573 | USB_DEVICE_ID_MATCH_VENDOR, 1574 .idVendor = 0x0930, 1575 .bInterfaceClass = USB_CLASS_COMM, 1576 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1577 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1578 .driver_info = (unsigned long) &wwan_info, 1579 }, 1580 1581 /* tag Huawei devices as wwan */ 1582 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 1583 USB_CLASS_COMM, 1584 USB_CDC_SUBCLASS_NCM, 1585 USB_CDC_PROTO_NONE), 1586 .driver_info = (unsigned long)&wwan_info, 1587 }, 1588 1589 /* Infineon(now Intel) HSPA Modem platform */ 1590 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443, 1591 USB_CLASS_COMM, 1592 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1593 .driver_info = (unsigned long)&wwan_noarp_info, 1594 }, 1595 1596 /* Generic CDC-NCM devices */ 1597 { USB_INTERFACE_INFO(USB_CLASS_COMM, 1598 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1599 .driver_info = (unsigned long)&cdc_ncm_info, 1600 }, 1601 { 1602 }, 1603 }; 1604 MODULE_DEVICE_TABLE(usb, cdc_devs); 1605 1606 static struct usb_driver cdc_ncm_driver = { 1607 .name = "cdc_ncm", 1608 .id_table = cdc_devs, 1609 .probe = usbnet_probe, 1610 .disconnect = usbnet_disconnect, 1611 .suspend = usbnet_suspend, 1612 .resume = usbnet_resume, 1613 .reset_resume = usbnet_resume, 1614 .supports_autosuspend = 1, 1615 .disable_hub_initiated_lpm = 1, 1616 }; 1617 1618 module_usb_driver(cdc_ncm_driver); 1619 1620 MODULE_AUTHOR("Hans Petter Selasky"); 1621 MODULE_DESCRIPTION("USB CDC NCM host driver"); 1622 MODULE_LICENSE("Dual BSD/GPL"); 1623