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/etherdevice.h> 45 #include <linux/ethtool.h> 46 #include <linux/workqueue.h> 47 #include <linux/mii.h> 48 #include <linux/crc32.h> 49 #include <linux/usb.h> 50 #include <linux/hrtimer.h> 51 #include <linux/atomic.h> 52 #include <linux/usb/usbnet.h> 53 #include <linux/usb/cdc.h> 54 #include <linux/usb/cdc_ncm.h> 55 56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM) 57 static bool prefer_mbim = true; 58 #else 59 static bool prefer_mbim; 60 #endif 61 module_param(prefer_mbim, bool, 0644); 62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions"); 63 64 static void cdc_ncm_txpath_bh(struct tasklet_struct *t); 65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); 66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); 67 static struct usb_driver cdc_ncm_driver; 68 69 struct cdc_ncm_stats { 70 char stat_string[ETH_GSTRING_LEN]; 71 int sizeof_stat; 72 int stat_offset; 73 }; 74 75 #define CDC_NCM_STAT(str, m) { \ 76 .stat_string = str, \ 77 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \ 78 .stat_offset = offsetof(struct cdc_ncm_ctx, m) } 79 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m) 80 81 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = { 82 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full), 83 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full), 84 CDC_NCM_SIMPLE_STAT(tx_reason_timeout), 85 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram), 86 CDC_NCM_SIMPLE_STAT(tx_overhead), 87 CDC_NCM_SIMPLE_STAT(tx_ntbs), 88 CDC_NCM_SIMPLE_STAT(rx_overhead), 89 CDC_NCM_SIMPLE_STAT(rx_ntbs), 90 }; 91 92 #define CDC_NCM_LOW_MEM_MAX_CNT 10 93 94 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset) 95 { 96 switch (sset) { 97 case ETH_SS_STATS: 98 return ARRAY_SIZE(cdc_ncm_gstrings_stats); 99 default: 100 return -EOPNOTSUPP; 101 } 102 } 103 104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev, 105 struct ethtool_stats __always_unused *stats, 106 u64 *data) 107 { 108 struct usbnet *dev = netdev_priv(netdev); 109 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 110 int i; 111 char *p = NULL; 112 113 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 114 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset; 115 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p; 116 } 117 } 118 119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data) 120 { 121 u8 *p = data; 122 int i; 123 124 switch (stringset) { 125 case ETH_SS_STATS: 126 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) { 127 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN); 128 p += ETH_GSTRING_LEN; 129 } 130 } 131 } 132 133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx); 134 135 static const struct ethtool_ops cdc_ncm_ethtool_ops = { 136 .get_link = usbnet_get_link, 137 .nway_reset = usbnet_nway_reset, 138 .get_drvinfo = usbnet_get_drvinfo, 139 .get_msglevel = usbnet_get_msglevel, 140 .set_msglevel = usbnet_set_msglevel, 141 .get_ts_info = ethtool_op_get_ts_info, 142 .get_sset_count = cdc_ncm_get_sset_count, 143 .get_strings = cdc_ncm_get_strings, 144 .get_ethtool_stats = cdc_ncm_get_ethtool_stats, 145 .get_link_ksettings = usbnet_get_link_ksettings, 146 .set_link_ksettings = usbnet_set_link_ksettings, 147 }; 148 149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx) 150 { 151 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 152 u32 val, max, min; 153 154 /* clamp new_rx to sane values */ 155 min = USB_CDC_NCM_NTB_MIN_IN_SIZE; 156 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 157 158 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */ 159 if (max < min) { 160 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n", 161 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min); 162 max = min; 163 } 164 165 val = clamp_t(u32, new_rx, min, max); 166 if (val != new_rx) 167 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max); 168 169 return val; 170 } 171 172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx) 173 { 174 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 175 u32 val, max, min; 176 177 /* clamp new_tx to sane values */ 178 if (ctx->is_ndp16) 179 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16); 180 else 181 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth32); 182 183 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 184 185 /* some devices set dwNtbOutMaxSize too low for the above default */ 186 min = min(min, max); 187 188 val = clamp_t(u32, new_tx, min, max); 189 if (val != new_tx) 190 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max); 191 192 return val; 193 } 194 195 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf) 196 { 197 struct usbnet *dev = netdev_priv(to_net_dev(d)); 198 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 199 200 return sprintf(buf, "%u\n", ctx->min_tx_pkt); 201 } 202 203 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf) 204 { 205 struct usbnet *dev = netdev_priv(to_net_dev(d)); 206 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 207 208 return sprintf(buf, "%u\n", ctx->rx_max); 209 } 210 211 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf) 212 { 213 struct usbnet *dev = netdev_priv(to_net_dev(d)); 214 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 215 216 return sprintf(buf, "%u\n", ctx->tx_max); 217 } 218 219 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf) 220 { 221 struct usbnet *dev = netdev_priv(to_net_dev(d)); 222 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 223 224 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC); 225 } 226 227 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 228 { 229 struct usbnet *dev = netdev_priv(to_net_dev(d)); 230 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 231 unsigned long val; 232 233 /* no need to restrict values - anything from 0 to infinity is OK */ 234 if (kstrtoul(buf, 0, &val)) 235 return -EINVAL; 236 237 ctx->min_tx_pkt = val; 238 return len; 239 } 240 241 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 242 { 243 struct usbnet *dev = netdev_priv(to_net_dev(d)); 244 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 245 unsigned long val; 246 247 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val) 248 return -EINVAL; 249 250 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max); 251 return len; 252 } 253 254 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 255 { 256 struct usbnet *dev = netdev_priv(to_net_dev(d)); 257 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 258 unsigned long val; 259 260 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val) 261 return -EINVAL; 262 263 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val); 264 return len; 265 } 266 267 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 268 { 269 struct usbnet *dev = netdev_priv(to_net_dev(d)); 270 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 271 ssize_t ret; 272 unsigned long val; 273 274 ret = kstrtoul(buf, 0, &val); 275 if (ret) 276 return ret; 277 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX)) 278 return -EINVAL; 279 280 spin_lock_bh(&ctx->mtx); 281 ctx->timer_interval = val * NSEC_PER_USEC; 282 if (!ctx->timer_interval) 283 ctx->tx_timer_pending = 0; 284 spin_unlock_bh(&ctx->mtx); 285 return len; 286 } 287 288 static DEVICE_ATTR(min_tx_pkt, 0644, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt); 289 static DEVICE_ATTR(rx_max, 0644, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max); 290 static DEVICE_ATTR(tx_max, 0644, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max); 291 static DEVICE_ATTR(tx_timer_usecs, 0644, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs); 292 293 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf) 294 { 295 struct usbnet *dev = netdev_priv(to_net_dev(d)); 296 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 297 298 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N'); 299 } 300 301 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len) 302 { 303 struct usbnet *dev = netdev_priv(to_net_dev(d)); 304 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 305 bool enable; 306 307 if (strtobool(buf, &enable)) 308 return -EINVAL; 309 310 /* no change? */ 311 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 312 return len; 313 314 if (enable) { 315 if (ctx->is_ndp16 && !ctx->delayed_ndp16) { 316 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL); 317 if (!ctx->delayed_ndp16) 318 return -ENOMEM; 319 } 320 if (!ctx->is_ndp16 && !ctx->delayed_ndp32) { 321 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL); 322 if (!ctx->delayed_ndp32) 323 return -ENOMEM; 324 } 325 } 326 327 /* flush pending data before changing flag */ 328 netif_tx_lock_bh(dev->net); 329 usbnet_start_xmit(NULL, dev->net); 330 spin_lock_bh(&ctx->mtx); 331 if (enable) 332 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END; 333 else 334 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END; 335 spin_unlock_bh(&ctx->mtx); 336 netif_tx_unlock_bh(dev->net); 337 338 return len; 339 } 340 static DEVICE_ATTR_RW(ndp_to_end); 341 342 #define NCM_PARM_ATTR(name, format, tocpu) \ 343 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \ 344 { \ 345 struct usbnet *dev = netdev_priv(to_net_dev(d)); \ 346 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \ 347 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \ 348 } \ 349 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL) 350 351 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu); 352 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu); 353 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu); 354 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu); 355 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu); 356 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu); 357 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu); 358 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu); 359 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu); 360 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu); 361 362 static struct attribute *cdc_ncm_sysfs_attrs[] = { 363 &dev_attr_min_tx_pkt.attr, 364 &dev_attr_ndp_to_end.attr, 365 &dev_attr_rx_max.attr, 366 &dev_attr_tx_max.attr, 367 &dev_attr_tx_timer_usecs.attr, 368 &dev_attr_bmNtbFormatsSupported.attr, 369 &dev_attr_dwNtbInMaxSize.attr, 370 &dev_attr_wNdpInDivisor.attr, 371 &dev_attr_wNdpInPayloadRemainder.attr, 372 &dev_attr_wNdpInAlignment.attr, 373 &dev_attr_dwNtbOutMaxSize.attr, 374 &dev_attr_wNdpOutDivisor.attr, 375 &dev_attr_wNdpOutPayloadRemainder.attr, 376 &dev_attr_wNdpOutAlignment.attr, 377 &dev_attr_wNtbOutMaxDatagrams.attr, 378 NULL, 379 }; 380 381 static const struct attribute_group cdc_ncm_sysfs_attr_group = { 382 .name = "cdc_ncm", 383 .attrs = cdc_ncm_sysfs_attrs, 384 }; 385 386 /* handle rx_max and tx_max changes */ 387 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx) 388 { 389 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 390 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 391 u32 val; 392 393 val = cdc_ncm_check_rx_max(dev, new_rx); 394 395 /* inform device about NTB input size changes */ 396 if (val != ctx->rx_max) { 397 __le32 dwNtbInMaxSize = cpu_to_le32(val); 398 399 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val); 400 401 /* tell device to use new size */ 402 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE, 403 USB_TYPE_CLASS | USB_DIR_OUT 404 | USB_RECIP_INTERFACE, 405 0, iface_no, &dwNtbInMaxSize, 4) < 0) 406 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n"); 407 else 408 ctx->rx_max = val; 409 } 410 411 /* usbnet use these values for sizing rx queues */ 412 if (dev->rx_urb_size != ctx->rx_max) { 413 dev->rx_urb_size = ctx->rx_max; 414 if (netif_running(dev->net)) 415 usbnet_unlink_rx_urbs(dev); 416 } 417 418 val = cdc_ncm_check_tx_max(dev, new_tx); 419 if (val != ctx->tx_max) 420 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val); 421 422 /* Adding a pad byte here if necessary simplifies the handling 423 * in cdc_ncm_fill_tx_frame, making tx_max always represent 424 * the real skb max size. 425 * 426 * We cannot use dev->maxpacket here because this is called from 427 * .bind which is called before usbnet sets up dev->maxpacket 428 */ 429 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) && 430 val % usb_maxpacket(dev->udev, dev->out, 1) == 0) 431 val++; 432 433 /* we might need to flush any pending tx buffers if running */ 434 if (netif_running(dev->net) && val > ctx->tx_max) { 435 netif_tx_lock_bh(dev->net); 436 usbnet_start_xmit(NULL, dev->net); 437 /* make sure tx_curr_skb is reallocated if it was empty */ 438 if (ctx->tx_curr_skb) { 439 dev_kfree_skb_any(ctx->tx_curr_skb); 440 ctx->tx_curr_skb = NULL; 441 } 442 ctx->tx_max = val; 443 netif_tx_unlock_bh(dev->net); 444 } else { 445 ctx->tx_max = val; 446 } 447 448 dev->hard_mtu = ctx->tx_max; 449 450 /* max qlen depend on hard_mtu and rx_urb_size */ 451 usbnet_update_max_qlen(dev); 452 453 /* never pad more than 3 full USB packets per transfer */ 454 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1), 455 CDC_NCM_MIN_TX_PKT, ctx->tx_max); 456 } 457 458 /* helpers for NCM and MBIM differences */ 459 static u8 cdc_ncm_flags(struct usbnet *dev) 460 { 461 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 462 463 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 464 return ctx->mbim_desc->bmNetworkCapabilities; 465 if (ctx->func_desc) 466 return ctx->func_desc->bmNetworkCapabilities; 467 return 0; 468 } 469 470 static int cdc_ncm_eth_hlen(struct usbnet *dev) 471 { 472 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 473 return 0; 474 return ETH_HLEN; 475 } 476 477 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev) 478 { 479 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) 480 return CDC_MBIM_MIN_DATAGRAM_SIZE; 481 return CDC_NCM_MIN_DATAGRAM_SIZE; 482 } 483 484 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev) 485 { 486 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 487 488 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) 489 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize); 490 if (ctx->ether_desc) 491 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); 492 return CDC_NCM_MAX_DATAGRAM_SIZE; 493 } 494 495 /* initial one-time device setup. MUST be called with the data interface 496 * in altsetting 0 497 */ 498 static int cdc_ncm_init(struct usbnet *dev) 499 { 500 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 501 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 502 int err; 503 504 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS, 505 USB_TYPE_CLASS | USB_DIR_IN 506 |USB_RECIP_INTERFACE, 507 0, iface_no, &ctx->ncm_parm, 508 sizeof(ctx->ncm_parm)); 509 if (err < 0) { 510 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n"); 511 return err; /* GET_NTB_PARAMETERS is required */ 512 } 513 514 /* set CRC Mode */ 515 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) { 516 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n"); 517 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE, 518 USB_TYPE_CLASS | USB_DIR_OUT 519 | USB_RECIP_INTERFACE, 520 USB_CDC_NCM_CRC_NOT_APPENDED, 521 iface_no, NULL, 0); 522 if (err < 0) 523 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n"); 524 } 525 526 /* use ndp16 by default */ 527 ctx->is_ndp16 = 1; 528 529 /* set NTB format, if both formats are supported. 530 * 531 * "The host shall only send this command while the NCM Data 532 * Interface is in alternate setting 0." 533 */ 534 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) & 535 USB_CDC_NCM_NTB32_SUPPORTED) { 536 if (ctx->drvflags & CDC_NCM_FLAG_PREFER_NTB32) { 537 ctx->is_ndp16 = 0; 538 dev_dbg(&dev->intf->dev, "Setting NTB format to 32-bit\n"); 539 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT, 540 USB_TYPE_CLASS | USB_DIR_OUT 541 | USB_RECIP_INTERFACE, 542 USB_CDC_NCM_NTB32_FORMAT, 543 iface_no, NULL, 0); 544 } else { 545 ctx->is_ndp16 = 1; 546 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n"); 547 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT, 548 USB_TYPE_CLASS | USB_DIR_OUT 549 | USB_RECIP_INTERFACE, 550 USB_CDC_NCM_NTB16_FORMAT, 551 iface_no, NULL, 0); 552 } 553 if (err < 0) { 554 ctx->is_ndp16 = 1; 555 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n"); 556 } 557 } 558 559 /* set initial device values */ 560 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); 561 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); 562 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); 563 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); 564 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); 565 /* devices prior to NCM Errata shall set this field to zero */ 566 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); 567 568 dev_dbg(&dev->intf->dev, 569 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", 570 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, 571 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev)); 572 573 /* max count of tx datagrams */ 574 if ((ctx->tx_max_datagrams == 0) || 575 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) 576 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; 577 578 /* set up maximum NDP size */ 579 if (ctx->is_ndp16) 580 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16); 581 else 582 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp32) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe32); 583 584 /* initial coalescing timer interval */ 585 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC; 586 587 return 0; 588 } 589 590 /* set a new max datagram size */ 591 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size) 592 { 593 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 594 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; 595 __le16 max_datagram_size; 596 u16 mbim_mtu; 597 int err; 598 599 /* set default based on descriptors */ 600 ctx->max_datagram_size = clamp_t(u32, new_size, 601 cdc_ncm_min_dgram_size(dev), 602 CDC_NCM_MAX_DATAGRAM_SIZE); 603 604 /* inform the device about the selected Max Datagram Size? */ 605 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE)) 606 goto out; 607 608 /* read current mtu value from device */ 609 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE, 610 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE, 611 0, iface_no, &max_datagram_size, sizeof(max_datagram_size)); 612 if (err != sizeof(max_datagram_size)) { 613 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n"); 614 goto out; 615 } 616 617 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size) 618 goto out; 619 620 max_datagram_size = cpu_to_le16(ctx->max_datagram_size); 621 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE, 622 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE, 623 0, iface_no, &max_datagram_size, sizeof(max_datagram_size)); 624 if (err < 0) 625 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n"); 626 627 out: 628 /* set MTU to max supported by the device if necessary */ 629 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev)); 630 631 /* do not exceed operater preferred MTU */ 632 if (ctx->mbim_extended_desc) { 633 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU); 634 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu) 635 dev->net->mtu = mbim_mtu; 636 } 637 } 638 639 static void cdc_ncm_fix_modulus(struct usbnet *dev) 640 { 641 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 642 u32 val; 643 644 /* 645 * verify that the structure alignment is: 646 * - power of two 647 * - not greater than the maximum transmit length 648 * - not less than four bytes 649 */ 650 val = ctx->tx_ndp_modulus; 651 652 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 653 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 654 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n"); 655 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 656 } 657 658 /* 659 * verify that the payload alignment is: 660 * - power of two 661 * - not greater than the maximum transmit length 662 * - not less than four bytes 663 */ 664 val = ctx->tx_modulus; 665 666 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || 667 (val != ((-val) & val)) || (val >= ctx->tx_max)) { 668 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n"); 669 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; 670 } 671 672 /* verify the payload remainder */ 673 if (ctx->tx_remainder >= ctx->tx_modulus) { 674 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n"); 675 ctx->tx_remainder = 0; 676 } 677 678 /* adjust TX-remainder according to NCM specification. */ 679 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) & 680 (ctx->tx_modulus - 1)); 681 } 682 683 static int cdc_ncm_setup(struct usbnet *dev) 684 { 685 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 686 u32 def_rx, def_tx; 687 688 /* be conservative when selecting intial buffer size to 689 * increase the number of hosts this will work for 690 */ 691 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX, 692 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); 693 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX, 694 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); 695 696 /* clamp rx_max and tx_max and inform device */ 697 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx); 698 699 /* sanitize the modulus and remainder values */ 700 cdc_ncm_fix_modulus(dev); 701 702 /* set max datagram size */ 703 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev)); 704 return 0; 705 } 706 707 static void 708 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf) 709 { 710 struct usb_host_endpoint *e, *in = NULL, *out = NULL; 711 u8 ep; 712 713 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { 714 e = intf->cur_altsetting->endpoint + ep; 715 716 /* ignore endpoints which cannot transfer data */ 717 if (!usb_endpoint_maxp(&e->desc)) 718 continue; 719 720 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 721 case USB_ENDPOINT_XFER_INT: 722 if (usb_endpoint_dir_in(&e->desc)) { 723 if (!dev->status) 724 dev->status = e; 725 } 726 break; 727 728 case USB_ENDPOINT_XFER_BULK: 729 if (usb_endpoint_dir_in(&e->desc)) { 730 if (!in) 731 in = e; 732 } else { 733 if (!out) 734 out = e; 735 } 736 break; 737 738 default: 739 break; 740 } 741 } 742 if (in && !dev->in) 743 dev->in = usb_rcvbulkpipe(dev->udev, 744 in->desc.bEndpointAddress & 745 USB_ENDPOINT_NUMBER_MASK); 746 if (out && !dev->out) 747 dev->out = usb_sndbulkpipe(dev->udev, 748 out->desc.bEndpointAddress & 749 USB_ENDPOINT_NUMBER_MASK); 750 } 751 752 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) 753 { 754 if (ctx == NULL) 755 return; 756 757 if (ctx->tx_rem_skb != NULL) { 758 dev_kfree_skb_any(ctx->tx_rem_skb); 759 ctx->tx_rem_skb = NULL; 760 } 761 762 if (ctx->tx_curr_skb != NULL) { 763 dev_kfree_skb_any(ctx->tx_curr_skb); 764 ctx->tx_curr_skb = NULL; 765 } 766 767 if (ctx->is_ndp16) 768 kfree(ctx->delayed_ndp16); 769 else 770 kfree(ctx->delayed_ndp32); 771 772 kfree(ctx); 773 } 774 775 /* we need to override the usbnet change_mtu ndo for two reasons: 776 * - respect the negotiated maximum datagram size 777 * - avoid unwanted changes to rx and tx buffers 778 */ 779 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu) 780 { 781 struct usbnet *dev = netdev_priv(net); 782 783 net->mtu = new_mtu; 784 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev)); 785 786 return 0; 787 } 788 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu); 789 790 static const struct net_device_ops cdc_ncm_netdev_ops = { 791 .ndo_open = usbnet_open, 792 .ndo_stop = usbnet_stop, 793 .ndo_start_xmit = usbnet_start_xmit, 794 .ndo_tx_timeout = usbnet_tx_timeout, 795 .ndo_set_rx_mode = usbnet_set_rx_mode, 796 .ndo_get_stats64 = dev_get_tstats64, 797 .ndo_change_mtu = cdc_ncm_change_mtu, 798 .ndo_set_mac_address = eth_mac_addr, 799 .ndo_validate_addr = eth_validate_addr, 800 }; 801 802 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags) 803 { 804 struct cdc_ncm_ctx *ctx; 805 struct usb_driver *driver; 806 u8 *buf; 807 int len; 808 int temp; 809 u8 iface_no; 810 struct usb_cdc_parsed_header hdr; 811 812 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 813 if (!ctx) 814 return -ENOMEM; 815 816 ctx->dev = dev; 817 818 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 819 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; 820 tasklet_setup(&ctx->bh, cdc_ncm_txpath_bh); 821 atomic_set(&ctx->stop, 0); 822 spin_lock_init(&ctx->mtx); 823 824 /* store ctx pointer in device data field */ 825 dev->data[0] = (unsigned long)ctx; 826 827 /* only the control interface can be successfully probed */ 828 ctx->control = intf; 829 830 /* get some pointers */ 831 driver = driver_of(intf); 832 buf = intf->cur_altsetting->extra; 833 len = intf->cur_altsetting->extralen; 834 835 /* parse through descriptors associated with control interface */ 836 cdc_parse_cdc_header(&hdr, intf, buf, len); 837 838 if (hdr.usb_cdc_union_desc) 839 ctx->data = usb_ifnum_to_if(dev->udev, 840 hdr.usb_cdc_union_desc->bSlaveInterface0); 841 ctx->ether_desc = hdr.usb_cdc_ether_desc; 842 ctx->func_desc = hdr.usb_cdc_ncm_desc; 843 ctx->mbim_desc = hdr.usb_cdc_mbim_desc; 844 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc; 845 846 /* some buggy devices have an IAD but no CDC Union */ 847 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) { 848 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1); 849 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n"); 850 } 851 852 /* check if we got everything */ 853 if (!ctx->data) { 854 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n"); 855 goto error; 856 } 857 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) { 858 if (!ctx->mbim_desc) { 859 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n"); 860 goto error; 861 } 862 } else { 863 if (!ctx->ether_desc || !ctx->func_desc) { 864 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n"); 865 goto error; 866 } 867 } 868 869 /* claim data interface, if different from control */ 870 if (ctx->data != ctx->control) { 871 temp = usb_driver_claim_interface(driver, ctx->data, dev); 872 if (temp) { 873 dev_dbg(&intf->dev, "failed to claim data intf\n"); 874 goto error; 875 } 876 } 877 878 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; 879 880 /* Device-specific flags */ 881 ctx->drvflags = drvflags; 882 883 /* Reset data interface. Some devices will not reset properly 884 * unless they are configured first. Toggle the altsetting to 885 * force a reset. 886 * Some other devices do not work properly with this procedure 887 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE 888 */ 889 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE)) 890 usb_set_interface(dev->udev, iface_no, data_altsetting); 891 892 temp = usb_set_interface(dev->udev, iface_no, 0); 893 if (temp) { 894 dev_dbg(&intf->dev, "set interface failed\n"); 895 goto error2; 896 } 897 898 /* initialize basic device settings */ 899 if (cdc_ncm_init(dev)) 900 goto error2; 901 902 /* Some firmwares need a pause here or they will silently fail 903 * to set up the interface properly. This value was decided 904 * empirically on a Sierra Wireless MC7455 running 02.08.02.00 905 * firmware. 906 */ 907 usleep_range(10000, 20000); 908 909 /* configure data interface */ 910 temp = usb_set_interface(dev->udev, iface_no, data_altsetting); 911 if (temp) { 912 dev_dbg(&intf->dev, "set interface failed\n"); 913 goto error2; 914 } 915 916 cdc_ncm_find_endpoints(dev, ctx->data); 917 cdc_ncm_find_endpoints(dev, ctx->control); 918 if (!dev->in || !dev->out || !dev->status) { 919 dev_dbg(&intf->dev, "failed to collect endpoints\n"); 920 goto error2; 921 } 922 923 usb_set_intfdata(ctx->data, dev); 924 usb_set_intfdata(ctx->control, dev); 925 926 if (ctx->ether_desc) { 927 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); 928 if (temp) { 929 dev_dbg(&intf->dev, "failed to get mac address\n"); 930 goto error2; 931 } 932 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr); 933 } 934 935 /* finish setting up the device specific data */ 936 cdc_ncm_setup(dev); 937 938 /* Allocate the delayed NDP if needed. */ 939 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 940 if (ctx->is_ndp16) { 941 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL); 942 if (!ctx->delayed_ndp16) 943 goto error2; 944 } else { 945 ctx->delayed_ndp32 = kzalloc(ctx->max_ndp_size, GFP_KERNEL); 946 if (!ctx->delayed_ndp32) 947 goto error2; 948 } 949 dev_info(&intf->dev, "NDP will be placed at end of frame for this device."); 950 } 951 952 /* override ethtool_ops */ 953 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; 954 955 /* add our sysfs attrs */ 956 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group; 957 958 /* must handle MTU changes */ 959 dev->net->netdev_ops = &cdc_ncm_netdev_ops; 960 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev); 961 962 return 0; 963 964 error2: 965 usb_set_intfdata(ctx->control, NULL); 966 usb_set_intfdata(ctx->data, NULL); 967 if (ctx->data != ctx->control) 968 usb_driver_release_interface(driver, ctx->data); 969 error: 970 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); 971 dev->data[0] = 0; 972 dev_info(&intf->dev, "bind() failure\n"); 973 return -ENODEV; 974 } 975 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common); 976 977 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) 978 { 979 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 980 struct usb_driver *driver = driver_of(intf); 981 982 if (ctx == NULL) 983 return; /* no setup */ 984 985 atomic_set(&ctx->stop, 1); 986 987 hrtimer_cancel(&ctx->tx_timer); 988 989 tasklet_kill(&ctx->bh); 990 991 /* handle devices with combined control and data interface */ 992 if (ctx->control == ctx->data) 993 ctx->data = NULL; 994 995 /* disconnect master --> disconnect slave */ 996 if (intf == ctx->control && ctx->data) { 997 usb_set_intfdata(ctx->data, NULL); 998 usb_driver_release_interface(driver, ctx->data); 999 ctx->data = NULL; 1000 1001 } else if (intf == ctx->data && ctx->control) { 1002 usb_set_intfdata(ctx->control, NULL); 1003 usb_driver_release_interface(driver, ctx->control); 1004 ctx->control = NULL; 1005 } 1006 1007 usb_set_intfdata(intf, NULL); 1008 cdc_ncm_free(ctx); 1009 } 1010 EXPORT_SYMBOL_GPL(cdc_ncm_unbind); 1011 1012 /* Return the number of the MBIM control interface altsetting iff it 1013 * is preferred and available, 1014 */ 1015 u8 cdc_ncm_select_altsetting(struct usb_interface *intf) 1016 { 1017 struct usb_host_interface *alt; 1018 1019 /* The MBIM spec defines a NCM compatible default altsetting, 1020 * which we may have matched: 1021 * 1022 * "Functions that implement both NCM 1.0 and MBIM (an 1023 * “NCM/MBIM function”) according to this recommendation 1024 * shall provide two alternate settings for the 1025 * Communication Interface. Alternate setting 0, and the 1026 * associated class and endpoint descriptors, shall be 1027 * constructed according to the rules given for the 1028 * Communication Interface in section 5 of [USBNCM10]. 1029 * Alternate setting 1, and the associated class and 1030 * endpoint descriptors, shall be constructed according to 1031 * the rules given in section 6 (USB Device Model) of this 1032 * specification." 1033 */ 1034 if (intf->num_altsetting < 2) 1035 return intf->cur_altsetting->desc.bAlternateSetting; 1036 1037 if (prefer_mbim) { 1038 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM); 1039 if (alt && cdc_ncm_comm_intf_is_mbim(alt)) 1040 return CDC_NCM_COMM_ALTSETTING_MBIM; 1041 } 1042 return CDC_NCM_COMM_ALTSETTING_NCM; 1043 } 1044 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting); 1045 1046 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) 1047 { 1048 /* MBIM backwards compatible function? */ 1049 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM) 1050 return -ENODEV; 1051 1052 /* The NCM data altsetting is fixed, so we hard-coded it. 1053 * Additionally, generic NCM devices are assumed to accept arbitrarily 1054 * placed NDP. 1055 */ 1056 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0); 1057 } 1058 1059 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max) 1060 { 1061 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder; 1062 1063 if (skb->len + align > max) 1064 align = max - skb->len; 1065 if (align && skb_tailroom(skb) >= align) 1066 skb_put_zero(skb, align); 1067 } 1068 1069 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly 1070 * allocating a new one within skb 1071 */ 1072 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) 1073 { 1074 struct usb_cdc_ncm_ndp16 *ndp16 = NULL; 1075 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data; 1076 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex); 1077 1078 /* If NDP should be moved to the end of the NCM package, we can't follow the 1079 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and 1080 * the wNdpIndex field in the header is actually not consistent with reality. It will be later. 1081 */ 1082 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 1083 if (ctx->delayed_ndp16->dwSignature == sign) 1084 return ctx->delayed_ndp16; 1085 1086 /* We can only push a single NDP to the end. Return 1087 * NULL to send what we've already got and queue this 1088 * skb for later. 1089 */ 1090 else if (ctx->delayed_ndp16->dwSignature) 1091 return NULL; 1092 } 1093 1094 /* follow the chain of NDPs, looking for a match */ 1095 while (ndpoffset) { 1096 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset); 1097 if (ndp16->dwSignature == sign) 1098 return ndp16; 1099 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); 1100 } 1101 1102 /* align new NDP */ 1103 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 1104 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size); 1105 1106 /* verify that there is room for the NDP and the datagram (reserve) */ 1107 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size) 1108 return NULL; 1109 1110 /* link to it */ 1111 if (ndp16) 1112 ndp16->wNextNdpIndex = cpu_to_le16(skb->len); 1113 else 1114 nth16->wNdpIndex = cpu_to_le16(skb->len); 1115 1116 /* push a new empty NDP */ 1117 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 1118 ndp16 = skb_put_zero(skb, ctx->max_ndp_size); 1119 else 1120 ndp16 = ctx->delayed_ndp16; 1121 1122 ndp16->dwSignature = sign; 1123 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16)); 1124 return ndp16; 1125 } 1126 1127 static struct usb_cdc_ncm_ndp32 *cdc_ncm_ndp32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) 1128 { 1129 struct usb_cdc_ncm_ndp32 *ndp32 = NULL; 1130 struct usb_cdc_ncm_nth32 *nth32 = (void *)skb->data; 1131 size_t ndpoffset = le32_to_cpu(nth32->dwNdpIndex); 1132 1133 /* If NDP should be moved to the end of the NCM package, we can't follow the 1134 * NTH32 header as we would normally do. NDP isn't written to the SKB yet, and 1135 * the wNdpIndex field in the header is actually not consistent with reality. It will be later. 1136 */ 1137 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 1138 if (ctx->delayed_ndp32->dwSignature == sign) 1139 return ctx->delayed_ndp32; 1140 1141 /* We can only push a single NDP to the end. Return 1142 * NULL to send what we've already got and queue this 1143 * skb for later. 1144 */ 1145 else if (ctx->delayed_ndp32->dwSignature) 1146 return NULL; 1147 } 1148 1149 /* follow the chain of NDPs, looking for a match */ 1150 while (ndpoffset) { 1151 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb->data + ndpoffset); 1152 if (ndp32->dwSignature == sign) 1153 return ndp32; 1154 ndpoffset = le32_to_cpu(ndp32->dwNextNdpIndex); 1155 } 1156 1157 /* align new NDP */ 1158 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 1159 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size); 1160 1161 /* verify that there is room for the NDP and the datagram (reserve) */ 1162 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size) 1163 return NULL; 1164 1165 /* link to it */ 1166 if (ndp32) 1167 ndp32->dwNextNdpIndex = cpu_to_le32(skb->len); 1168 else 1169 nth32->dwNdpIndex = cpu_to_le32(skb->len); 1170 1171 /* push a new empty NDP */ 1172 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)) 1173 ndp32 = skb_put_zero(skb, ctx->max_ndp_size); 1174 else 1175 ndp32 = ctx->delayed_ndp32; 1176 1177 ndp32->dwSignature = sign; 1178 ndp32->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp32) + sizeof(struct usb_cdc_ncm_dpe32)); 1179 return ndp32; 1180 } 1181 1182 struct sk_buff * 1183 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign) 1184 { 1185 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1186 union { 1187 struct usb_cdc_ncm_nth16 *nth16; 1188 struct usb_cdc_ncm_nth32 *nth32; 1189 } nth; 1190 union { 1191 struct usb_cdc_ncm_ndp16 *ndp16; 1192 struct usb_cdc_ncm_ndp32 *ndp32; 1193 } ndp; 1194 struct sk_buff *skb_out; 1195 u16 n = 0, index, ndplen; 1196 u8 ready2send = 0; 1197 u32 delayed_ndp_size; 1198 size_t padding_count; 1199 1200 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated 1201 * accordingly. Otherwise, we should check here. 1202 */ 1203 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) 1204 delayed_ndp_size = ctx->max_ndp_size + 1205 max_t(u32, 1206 ctx->tx_ndp_modulus, 1207 ctx->tx_modulus + ctx->tx_remainder) - 1; 1208 else 1209 delayed_ndp_size = 0; 1210 1211 /* if there is a remaining skb, it gets priority */ 1212 if (skb != NULL) { 1213 swap(skb, ctx->tx_rem_skb); 1214 swap(sign, ctx->tx_rem_sign); 1215 } else { 1216 ready2send = 1; 1217 } 1218 1219 /* check if we are resuming an OUT skb */ 1220 skb_out = ctx->tx_curr_skb; 1221 1222 /* allocate a new OUT skb */ 1223 if (!skb_out) { 1224 if (ctx->tx_low_mem_val == 0) { 1225 ctx->tx_curr_size = ctx->tx_max; 1226 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC); 1227 /* If the memory allocation fails we will wait longer 1228 * each time before attempting another full size 1229 * allocation again to not overload the system 1230 * further. 1231 */ 1232 if (skb_out == NULL) { 1233 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1, 1234 (unsigned)CDC_NCM_LOW_MEM_MAX_CNT); 1235 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt; 1236 } 1237 } 1238 if (skb_out == NULL) { 1239 /* See if a very small allocation is possible. 1240 * We will send this packet immediately and hope 1241 * that there is more memory available later. 1242 */ 1243 if (skb) 1244 ctx->tx_curr_size = max(skb->len, 1245 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE); 1246 else 1247 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE; 1248 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC); 1249 1250 /* No allocation possible so we will abort */ 1251 if (skb_out == NULL) { 1252 if (skb != NULL) { 1253 dev_kfree_skb_any(skb); 1254 dev->net->stats.tx_dropped++; 1255 } 1256 goto exit_no_skb; 1257 } 1258 ctx->tx_low_mem_val--; 1259 } 1260 if (ctx->is_ndp16) { 1261 /* fill out the initial 16-bit NTB header */ 1262 nth.nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16)); 1263 nth.nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); 1264 nth.nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)); 1265 nth.nth16->wSequence = cpu_to_le16(ctx->tx_seq++); 1266 } else { 1267 /* fill out the initial 32-bit NTB header */ 1268 nth.nth32 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth32)); 1269 nth.nth32->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH32_SIGN); 1270 nth.nth32->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth32)); 1271 nth.nth32->wSequence = cpu_to_le16(ctx->tx_seq++); 1272 } 1273 1274 /* count total number of frames in this NTB */ 1275 ctx->tx_curr_frame_num = 0; 1276 1277 /* recent payload counter for this skb_out */ 1278 ctx->tx_curr_frame_payload = 0; 1279 } 1280 1281 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) { 1282 /* send any remaining skb first */ 1283 if (skb == NULL) { 1284 skb = ctx->tx_rem_skb; 1285 sign = ctx->tx_rem_sign; 1286 ctx->tx_rem_skb = NULL; 1287 1288 /* check for end of skb */ 1289 if (skb == NULL) 1290 break; 1291 } 1292 1293 /* get the appropriate NDP for this skb */ 1294 if (ctx->is_ndp16) 1295 ndp.ndp16 = cdc_ncm_ndp16(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); 1296 else 1297 ndp.ndp32 = cdc_ncm_ndp32(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); 1298 1299 /* align beginning of next frame */ 1300 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size); 1301 1302 /* check if we had enough room left for both NDP and frame */ 1303 if ((ctx->is_ndp16 && !ndp.ndp16) || (!ctx->is_ndp16 && !ndp.ndp32) || 1304 skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) { 1305 if (n == 0) { 1306 /* won't fit, MTU problem? */ 1307 dev_kfree_skb_any(skb); 1308 skb = NULL; 1309 dev->net->stats.tx_dropped++; 1310 } else { 1311 /* no room for skb - store for later */ 1312 if (ctx->tx_rem_skb != NULL) { 1313 dev_kfree_skb_any(ctx->tx_rem_skb); 1314 dev->net->stats.tx_dropped++; 1315 } 1316 ctx->tx_rem_skb = skb; 1317 ctx->tx_rem_sign = sign; 1318 skb = NULL; 1319 ready2send = 1; 1320 ctx->tx_reason_ntb_full++; /* count reason for transmitting */ 1321 } 1322 break; 1323 } 1324 1325 /* calculate frame number within this NDP */ 1326 if (ctx->is_ndp16) { 1327 ndplen = le16_to_cpu(ndp.ndp16->wLength); 1328 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1; 1329 1330 /* OK, add this skb */ 1331 ndp.ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len); 1332 ndp.ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len); 1333 ndp.ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16)); 1334 } else { 1335 ndplen = le16_to_cpu(ndp.ndp32->wLength); 1336 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp32)) / sizeof(struct usb_cdc_ncm_dpe32) - 1; 1337 1338 ndp.ndp32->dpe32[index].dwDatagramLength = cpu_to_le32(skb->len); 1339 ndp.ndp32->dpe32[index].dwDatagramIndex = cpu_to_le32(skb_out->len); 1340 ndp.ndp32->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe32)); 1341 } 1342 skb_put_data(skb_out, skb->data, skb->len); 1343 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */ 1344 dev_kfree_skb_any(skb); 1345 skb = NULL; 1346 1347 /* send now if this NDP is full */ 1348 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) { 1349 ready2send = 1; 1350 ctx->tx_reason_ndp_full++; /* count reason for transmitting */ 1351 break; 1352 } 1353 } 1354 1355 /* free up any dangling skb */ 1356 if (skb != NULL) { 1357 dev_kfree_skb_any(skb); 1358 skb = NULL; 1359 dev->net->stats.tx_dropped++; 1360 } 1361 1362 ctx->tx_curr_frame_num = n; 1363 1364 if (n == 0) { 1365 /* wait for more frames */ 1366 /* push variables */ 1367 ctx->tx_curr_skb = skb_out; 1368 goto exit_no_skb; 1369 1370 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) { 1371 /* wait for more frames */ 1372 /* push variables */ 1373 ctx->tx_curr_skb = skb_out; 1374 /* set the pending count */ 1375 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) 1376 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; 1377 goto exit_no_skb; 1378 1379 } else { 1380 if (n == ctx->tx_max_datagrams) 1381 ctx->tx_reason_max_datagram++; /* count reason for transmitting */ 1382 /* frame goes out */ 1383 /* variables will be reset at next call */ 1384 } 1385 1386 /* If requested, put NDP at end of frame. */ 1387 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) { 1388 if (ctx->is_ndp16) { 1389 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 1390 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size); 1391 nth.nth16->wNdpIndex = cpu_to_le16(skb_out->len); 1392 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size); 1393 1394 /* Zero out delayed NDP - signature checking will naturally fail. */ 1395 ndp.ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size); 1396 } else { 1397 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data; 1398 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size); 1399 nth.nth32->dwNdpIndex = cpu_to_le32(skb_out->len); 1400 skb_put_data(skb_out, ctx->delayed_ndp32, ctx->max_ndp_size); 1401 1402 ndp.ndp32 = memset(ctx->delayed_ndp32, 0, ctx->max_ndp_size); 1403 } 1404 } 1405 1406 /* If collected data size is less or equal ctx->min_tx_pkt 1407 * bytes, we send buffers as it is. If we get more data, it 1408 * would be more efficient for USB HS mobile device with DMA 1409 * engine to receive a full size NTB, than canceling DMA 1410 * transfer and receiving a short packet. 1411 * 1412 * This optimization support is pointless if we end up sending 1413 * a ZLP after full sized NTBs. 1414 */ 1415 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) && 1416 skb_out->len > ctx->min_tx_pkt) { 1417 padding_count = ctx->tx_curr_size - skb_out->len; 1418 if (!WARN_ON(padding_count > ctx->tx_curr_size)) 1419 skb_put_zero(skb_out, padding_count); 1420 } else if (skb_out->len < ctx->tx_curr_size && 1421 (skb_out->len % dev->maxpacket) == 0) { 1422 skb_put_u8(skb_out, 0); /* force short packet */ 1423 } 1424 1425 /* set final frame length */ 1426 if (ctx->is_ndp16) { 1427 nth.nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; 1428 nth.nth16->wBlockLength = cpu_to_le16(skb_out->len); 1429 } else { 1430 nth.nth32 = (struct usb_cdc_ncm_nth32 *)skb_out->data; 1431 nth.nth32->dwBlockLength = cpu_to_le32(skb_out->len); 1432 } 1433 1434 /* return skb */ 1435 ctx->tx_curr_skb = NULL; 1436 1437 /* keep private stats: framing overhead and number of NTBs */ 1438 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload; 1439 ctx->tx_ntbs++; 1440 1441 /* usbnet will count all the framing overhead by default. 1442 * Adjust the stats so that the tx_bytes counter show real 1443 * payload data instead. 1444 */ 1445 usbnet_set_skb_tx_stats(skb_out, n, 1446 (long)ctx->tx_curr_frame_payload - skb_out->len); 1447 1448 return skb_out; 1449 1450 exit_no_skb: 1451 /* Start timer, if there is a remaining non-empty skb */ 1452 if (ctx->tx_curr_skb != NULL && n > 0) 1453 cdc_ncm_tx_timeout_start(ctx); 1454 return NULL; 1455 } 1456 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame); 1457 1458 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) 1459 { 1460 /* start timer, if not already started */ 1461 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) 1462 hrtimer_start(&ctx->tx_timer, 1463 ctx->timer_interval, 1464 HRTIMER_MODE_REL); 1465 } 1466 1467 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) 1468 { 1469 struct cdc_ncm_ctx *ctx = 1470 container_of(timer, struct cdc_ncm_ctx, tx_timer); 1471 1472 if (!atomic_read(&ctx->stop)) 1473 tasklet_schedule(&ctx->bh); 1474 return HRTIMER_NORESTART; 1475 } 1476 1477 static void cdc_ncm_txpath_bh(struct tasklet_struct *t) 1478 { 1479 struct cdc_ncm_ctx *ctx = from_tasklet(ctx, t, bh); 1480 struct usbnet *dev = ctx->dev; 1481 1482 spin_lock_bh(&ctx->mtx); 1483 if (ctx->tx_timer_pending != 0) { 1484 ctx->tx_timer_pending--; 1485 cdc_ncm_tx_timeout_start(ctx); 1486 spin_unlock_bh(&ctx->mtx); 1487 } else if (dev->net != NULL) { 1488 ctx->tx_reason_timeout++; /* count reason for transmitting */ 1489 spin_unlock_bh(&ctx->mtx); 1490 netif_tx_lock_bh(dev->net); 1491 usbnet_start_xmit(NULL, dev->net); 1492 netif_tx_unlock_bh(dev->net); 1493 } else { 1494 spin_unlock_bh(&ctx->mtx); 1495 } 1496 } 1497 1498 struct sk_buff * 1499 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) 1500 { 1501 struct sk_buff *skb_out; 1502 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1503 1504 /* 1505 * The Ethernet API we are using does not support transmitting 1506 * multiple Ethernet frames in a single call. This driver will 1507 * accumulate multiple Ethernet frames and send out a larger 1508 * USB frame when the USB buffer is full or when a single jiffies 1509 * timeout happens. 1510 */ 1511 if (ctx == NULL) 1512 goto error; 1513 1514 spin_lock_bh(&ctx->mtx); 1515 1516 if (ctx->is_ndp16) 1517 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)); 1518 else 1519 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN)); 1520 1521 spin_unlock_bh(&ctx->mtx); 1522 return skb_out; 1523 1524 error: 1525 if (skb != NULL) 1526 dev_kfree_skb_any(skb); 1527 1528 return NULL; 1529 } 1530 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup); 1531 1532 /* verify NTB header and return offset of first NDP, or negative error */ 1533 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) 1534 { 1535 struct usbnet *dev = netdev_priv(skb_in->dev); 1536 struct usb_cdc_ncm_nth16 *nth16; 1537 int len; 1538 int ret = -EINVAL; 1539 1540 if (ctx == NULL) 1541 goto error; 1542 1543 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + 1544 sizeof(struct usb_cdc_ncm_ndp16))) { 1545 netif_dbg(dev, rx_err, dev->net, "frame too short\n"); 1546 goto error; 1547 } 1548 1549 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; 1550 1551 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) { 1552 netif_dbg(dev, rx_err, dev->net, 1553 "invalid NTH16 signature <%#010x>\n", 1554 le32_to_cpu(nth16->dwSignature)); 1555 goto error; 1556 } 1557 1558 len = le16_to_cpu(nth16->wBlockLength); 1559 if (len > ctx->rx_max) { 1560 netif_dbg(dev, rx_err, dev->net, 1561 "unsupported NTB block length %u/%u\n", len, 1562 ctx->rx_max); 1563 goto error; 1564 } 1565 1566 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && 1567 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && 1568 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { 1569 netif_dbg(dev, rx_err, dev->net, 1570 "sequence number glitch prev=%d curr=%d\n", 1571 ctx->rx_seq, le16_to_cpu(nth16->wSequence)); 1572 } 1573 ctx->rx_seq = le16_to_cpu(nth16->wSequence); 1574 1575 ret = le16_to_cpu(nth16->wNdpIndex); 1576 error: 1577 return ret; 1578 } 1579 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16); 1580 1581 int cdc_ncm_rx_verify_nth32(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) 1582 { 1583 struct usbnet *dev = netdev_priv(skb_in->dev); 1584 struct usb_cdc_ncm_nth32 *nth32; 1585 int len; 1586 int ret = -EINVAL; 1587 1588 if (ctx == NULL) 1589 goto error; 1590 1591 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth32) + 1592 sizeof(struct usb_cdc_ncm_ndp32))) { 1593 netif_dbg(dev, rx_err, dev->net, "frame too short\n"); 1594 goto error; 1595 } 1596 1597 nth32 = (struct usb_cdc_ncm_nth32 *)skb_in->data; 1598 1599 if (nth32->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH32_SIGN)) { 1600 netif_dbg(dev, rx_err, dev->net, 1601 "invalid NTH32 signature <%#010x>\n", 1602 le32_to_cpu(nth32->dwSignature)); 1603 goto error; 1604 } 1605 1606 len = le32_to_cpu(nth32->dwBlockLength); 1607 if (len > ctx->rx_max) { 1608 netif_dbg(dev, rx_err, dev->net, 1609 "unsupported NTB block length %u/%u\n", len, 1610 ctx->rx_max); 1611 goto error; 1612 } 1613 1614 if ((ctx->rx_seq + 1) != le16_to_cpu(nth32->wSequence) && 1615 (ctx->rx_seq || le16_to_cpu(nth32->wSequence)) && 1616 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth32->wSequence))) { 1617 netif_dbg(dev, rx_err, dev->net, 1618 "sequence number glitch prev=%d curr=%d\n", 1619 ctx->rx_seq, le16_to_cpu(nth32->wSequence)); 1620 } 1621 ctx->rx_seq = le16_to_cpu(nth32->wSequence); 1622 1623 ret = le32_to_cpu(nth32->dwNdpIndex); 1624 error: 1625 return ret; 1626 } 1627 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth32); 1628 1629 /* verify NDP header and return number of datagrams, or negative error */ 1630 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset) 1631 { 1632 struct usbnet *dev = netdev_priv(skb_in->dev); 1633 struct usb_cdc_ncm_ndp16 *ndp16; 1634 int ret = -EINVAL; 1635 1636 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { 1637 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n", 1638 ndpoffset); 1639 goto error; 1640 } 1641 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1642 1643 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { 1644 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n", 1645 le16_to_cpu(ndp16->wLength)); 1646 goto error; 1647 } 1648 1649 ret = ((le16_to_cpu(ndp16->wLength) - 1650 sizeof(struct usb_cdc_ncm_ndp16)) / 1651 sizeof(struct usb_cdc_ncm_dpe16)); 1652 ret--; /* we process NDP entries except for the last one */ 1653 1654 if ((sizeof(struct usb_cdc_ncm_ndp16) + 1655 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) { 1656 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret); 1657 ret = -EINVAL; 1658 } 1659 1660 error: 1661 return ret; 1662 } 1663 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16); 1664 1665 /* verify NDP header and return number of datagrams, or negative error */ 1666 int cdc_ncm_rx_verify_ndp32(struct sk_buff *skb_in, int ndpoffset) 1667 { 1668 struct usbnet *dev = netdev_priv(skb_in->dev); 1669 struct usb_cdc_ncm_ndp32 *ndp32; 1670 int ret = -EINVAL; 1671 1672 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp32)) > skb_in->len) { 1673 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n", 1674 ndpoffset); 1675 goto error; 1676 } 1677 ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset); 1678 1679 if (le16_to_cpu(ndp32->wLength) < USB_CDC_NCM_NDP32_LENGTH_MIN) { 1680 netif_dbg(dev, rx_err, dev->net, "invalid DPT32 length <%u>\n", 1681 le16_to_cpu(ndp32->wLength)); 1682 goto error; 1683 } 1684 1685 ret = ((le16_to_cpu(ndp32->wLength) - 1686 sizeof(struct usb_cdc_ncm_ndp32)) / 1687 sizeof(struct usb_cdc_ncm_dpe32)); 1688 ret--; /* we process NDP entries except for the last one */ 1689 1690 if ((sizeof(struct usb_cdc_ncm_ndp32) + 1691 ret * (sizeof(struct usb_cdc_ncm_dpe32))) > skb_in->len) { 1692 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret); 1693 ret = -EINVAL; 1694 } 1695 1696 error: 1697 return ret; 1698 } 1699 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp32); 1700 1701 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) 1702 { 1703 struct sk_buff *skb; 1704 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; 1705 int len; 1706 int nframes; 1707 int x; 1708 int offset; 1709 union { 1710 struct usb_cdc_ncm_ndp16 *ndp16; 1711 struct usb_cdc_ncm_ndp32 *ndp32; 1712 } ndp; 1713 union { 1714 struct usb_cdc_ncm_dpe16 *dpe16; 1715 struct usb_cdc_ncm_dpe32 *dpe32; 1716 } dpe; 1717 1718 int ndpoffset; 1719 int loopcount = 50; /* arbitrary max preventing infinite loop */ 1720 u32 payload = 0; 1721 1722 if (ctx->is_ndp16) 1723 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); 1724 else 1725 ndpoffset = cdc_ncm_rx_verify_nth32(ctx, skb_in); 1726 1727 if (ndpoffset < 0) 1728 goto error; 1729 1730 next_ndp: 1731 if (ctx->is_ndp16) { 1732 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); 1733 if (nframes < 0) 1734 goto error; 1735 1736 ndp.ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); 1737 1738 if (ndp.ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) { 1739 netif_dbg(dev, rx_err, dev->net, 1740 "invalid DPT16 signature <%#010x>\n", 1741 le32_to_cpu(ndp.ndp16->dwSignature)); 1742 goto err_ndp; 1743 } 1744 dpe.dpe16 = ndp.ndp16->dpe16; 1745 } else { 1746 nframes = cdc_ncm_rx_verify_ndp32(skb_in, ndpoffset); 1747 if (nframes < 0) 1748 goto error; 1749 1750 ndp.ndp32 = (struct usb_cdc_ncm_ndp32 *)(skb_in->data + ndpoffset); 1751 1752 if (ndp.ndp32->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP32_NOCRC_SIGN)) { 1753 netif_dbg(dev, rx_err, dev->net, 1754 "invalid DPT32 signature <%#010x>\n", 1755 le32_to_cpu(ndp.ndp32->dwSignature)); 1756 goto err_ndp; 1757 } 1758 dpe.dpe32 = ndp.ndp32->dpe32; 1759 } 1760 1761 for (x = 0; x < nframes; x++) { 1762 if (ctx->is_ndp16) { 1763 offset = le16_to_cpu(dpe.dpe16->wDatagramIndex); 1764 len = le16_to_cpu(dpe.dpe16->wDatagramLength); 1765 } else { 1766 offset = le32_to_cpu(dpe.dpe32->dwDatagramIndex); 1767 len = le32_to_cpu(dpe.dpe32->dwDatagramLength); 1768 } 1769 1770 /* 1771 * CDC NCM ch. 3.7 1772 * All entries after first NULL entry are to be ignored 1773 */ 1774 if ((offset == 0) || (len == 0)) { 1775 if (!x) 1776 goto err_ndp; /* empty NTB */ 1777 break; 1778 } 1779 1780 /* sanity checking */ 1781 if (((offset + len) > skb_in->len) || 1782 (len > ctx->rx_max) || (len < ETH_HLEN)) { 1783 netif_dbg(dev, rx_err, dev->net, 1784 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n", 1785 x, offset, len, skb_in); 1786 if (!x) 1787 goto err_ndp; 1788 break; 1789 1790 } else { 1791 /* create a fresh copy to reduce truesize */ 1792 skb = netdev_alloc_skb_ip_align(dev->net, len); 1793 if (!skb) 1794 goto error; 1795 skb_put_data(skb, skb_in->data + offset, len); 1796 usbnet_skb_return(dev, skb); 1797 payload += len; /* count payload bytes in this NTB */ 1798 } 1799 1800 if (ctx->is_ndp16) 1801 dpe.dpe16++; 1802 else 1803 dpe.dpe32++; 1804 } 1805 err_ndp: 1806 /* are there more NDPs to process? */ 1807 if (ctx->is_ndp16) 1808 ndpoffset = le16_to_cpu(ndp.ndp16->wNextNdpIndex); 1809 else 1810 ndpoffset = le32_to_cpu(ndp.ndp32->dwNextNdpIndex); 1811 1812 if (ndpoffset && loopcount--) 1813 goto next_ndp; 1814 1815 /* update stats */ 1816 ctx->rx_overhead += skb_in->len - payload; 1817 ctx->rx_ntbs++; 1818 1819 return 1; 1820 error: 1821 return 0; 1822 } 1823 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup); 1824 1825 static void 1826 cdc_ncm_speed_change(struct usbnet *dev, 1827 struct usb_cdc_speed_change *data) 1828 { 1829 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); 1830 uint32_t tx_speed = le32_to_cpu(data->ULBitRate); 1831 1832 /* if the speed hasn't changed, don't report it. 1833 * RTL8156 shipped before 2021 sends notification about every 32ms. 1834 */ 1835 if (dev->rx_speed == rx_speed && dev->tx_speed == tx_speed) 1836 return; 1837 1838 dev->rx_speed = rx_speed; 1839 dev->tx_speed = tx_speed; 1840 1841 /* 1842 * Currently the USB-NET API does not support reporting the actual 1843 * device speed. Do print it instead. 1844 */ 1845 if ((tx_speed > 1000000) && (rx_speed > 1000000)) { 1846 netif_info(dev, link, dev->net, 1847 "%u mbit/s downlink %u mbit/s uplink\n", 1848 (unsigned int)(rx_speed / 1000000U), 1849 (unsigned int)(tx_speed / 1000000U)); 1850 } else { 1851 netif_info(dev, link, dev->net, 1852 "%u kbit/s downlink %u kbit/s uplink\n", 1853 (unsigned int)(rx_speed / 1000U), 1854 (unsigned int)(tx_speed / 1000U)); 1855 } 1856 } 1857 1858 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) 1859 { 1860 struct usb_cdc_notification *event; 1861 1862 if (urb->actual_length < sizeof(*event)) 1863 return; 1864 1865 /* test for split data in 8-byte chunks */ 1866 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { 1867 cdc_ncm_speed_change(dev, 1868 (struct usb_cdc_speed_change *)urb->transfer_buffer); 1869 return; 1870 } 1871 1872 event = urb->transfer_buffer; 1873 1874 switch (event->bNotificationType) { 1875 case USB_CDC_NOTIFY_NETWORK_CONNECTION: 1876 /* 1877 * According to the CDC NCM specification ch.7.1 1878 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be 1879 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. 1880 */ 1881 if (netif_carrier_ok(dev->net) != !!event->wValue) 1882 usbnet_link_change(dev, !!event->wValue, 0); 1883 break; 1884 1885 case USB_CDC_NOTIFY_SPEED_CHANGE: 1886 if (urb->actual_length < (sizeof(*event) + 1887 sizeof(struct usb_cdc_speed_change))) 1888 set_bit(EVENT_STS_SPLIT, &dev->flags); 1889 else 1890 cdc_ncm_speed_change(dev, 1891 (struct usb_cdc_speed_change *)&event[1]); 1892 break; 1893 1894 default: 1895 dev_dbg(&dev->udev->dev, 1896 "NCM: unexpected notification 0x%02x!\n", 1897 event->bNotificationType); 1898 break; 1899 } 1900 } 1901 1902 static const struct driver_info cdc_ncm_info = { 1903 .description = "CDC NCM", 1904 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1905 | FLAG_LINK_INTR, 1906 .bind = cdc_ncm_bind, 1907 .unbind = cdc_ncm_unbind, 1908 .manage_power = usbnet_manage_power, 1909 .status = cdc_ncm_status, 1910 .rx_fixup = cdc_ncm_rx_fixup, 1911 .tx_fixup = cdc_ncm_tx_fixup, 1912 .set_rx_mode = usbnet_cdc_update_filter, 1913 }; 1914 1915 /* Same as cdc_ncm_info, but with FLAG_WWAN */ 1916 static const struct driver_info wwan_info = { 1917 .description = "Mobile Broadband Network Device", 1918 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1919 | FLAG_LINK_INTR | FLAG_WWAN, 1920 .bind = cdc_ncm_bind, 1921 .unbind = cdc_ncm_unbind, 1922 .manage_power = usbnet_manage_power, 1923 .status = cdc_ncm_status, 1924 .rx_fixup = cdc_ncm_rx_fixup, 1925 .tx_fixup = cdc_ncm_tx_fixup, 1926 .set_rx_mode = usbnet_cdc_update_filter, 1927 }; 1928 1929 /* Same as wwan_info, but with FLAG_NOARP */ 1930 static const struct driver_info wwan_noarp_info = { 1931 .description = "Mobile Broadband Network Device (NO ARP)", 1932 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET 1933 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP, 1934 .bind = cdc_ncm_bind, 1935 .unbind = cdc_ncm_unbind, 1936 .manage_power = usbnet_manage_power, 1937 .status = cdc_ncm_status, 1938 .rx_fixup = cdc_ncm_rx_fixup, 1939 .tx_fixup = cdc_ncm_tx_fixup, 1940 .set_rx_mode = usbnet_cdc_update_filter, 1941 }; 1942 1943 static const struct usb_device_id cdc_devs[] = { 1944 /* Ericsson MBM devices like F5521gw */ 1945 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1946 | USB_DEVICE_ID_MATCH_VENDOR, 1947 .idVendor = 0x0bdb, 1948 .bInterfaceClass = USB_CLASS_COMM, 1949 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1950 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1951 .driver_info = (unsigned long) &wwan_info, 1952 }, 1953 1954 /* Telit LE910 V2 */ 1955 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036, 1956 USB_CLASS_COMM, 1957 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1958 .driver_info = (unsigned long)&wwan_noarp_info, 1959 }, 1960 1961 /* DW5812 LTE Verizon Mobile Broadband Card 1962 * Unlike DW5550 this device requires FLAG_NOARP 1963 */ 1964 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb, 1965 USB_CLASS_COMM, 1966 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1967 .driver_info = (unsigned long)&wwan_noarp_info, 1968 }, 1969 1970 /* DW5813 LTE AT&T Mobile Broadband Card 1971 * Unlike DW5550 this device requires FLAG_NOARP 1972 */ 1973 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc, 1974 USB_CLASS_COMM, 1975 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 1976 .driver_info = (unsigned long)&wwan_noarp_info, 1977 }, 1978 1979 /* Dell branded MBM devices like DW5550 */ 1980 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1981 | USB_DEVICE_ID_MATCH_VENDOR, 1982 .idVendor = 0x413c, 1983 .bInterfaceClass = USB_CLASS_COMM, 1984 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1985 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1986 .driver_info = (unsigned long) &wwan_info, 1987 }, 1988 1989 /* Toshiba branded MBM devices */ 1990 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO 1991 | USB_DEVICE_ID_MATCH_VENDOR, 1992 .idVendor = 0x0930, 1993 .bInterfaceClass = USB_CLASS_COMM, 1994 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 1995 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 1996 .driver_info = (unsigned long) &wwan_info, 1997 }, 1998 1999 /* tag Huawei devices as wwan */ 2000 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 2001 USB_CLASS_COMM, 2002 USB_CDC_SUBCLASS_NCM, 2003 USB_CDC_PROTO_NONE), 2004 .driver_info = (unsigned long)&wwan_info, 2005 }, 2006 2007 /* Infineon(now Intel) HSPA Modem platform */ 2008 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443, 2009 USB_CLASS_COMM, 2010 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 2011 .driver_info = (unsigned long)&wwan_noarp_info, 2012 }, 2013 2014 /* u-blox TOBY-L4 */ 2015 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010, 2016 USB_CLASS_COMM, 2017 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 2018 .driver_info = (unsigned long)&wwan_info, 2019 }, 2020 2021 /* Generic CDC-NCM devices */ 2022 { USB_INTERFACE_INFO(USB_CLASS_COMM, 2023 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), 2024 .driver_info = (unsigned long)&cdc_ncm_info, 2025 }, 2026 { 2027 }, 2028 }; 2029 MODULE_DEVICE_TABLE(usb, cdc_devs); 2030 2031 static struct usb_driver cdc_ncm_driver = { 2032 .name = "cdc_ncm", 2033 .id_table = cdc_devs, 2034 .probe = usbnet_probe, 2035 .disconnect = usbnet_disconnect, 2036 .suspend = usbnet_suspend, 2037 .resume = usbnet_resume, 2038 .reset_resume = usbnet_resume, 2039 .supports_autosuspend = 1, 2040 .disable_hub_initiated_lpm = 1, 2041 }; 2042 2043 module_usb_driver(cdc_ncm_driver); 2044 2045 MODULE_AUTHOR("Hans Petter Selasky"); 2046 MODULE_DESCRIPTION("USB CDC NCM host driver"); 2047 MODULE_LICENSE("Dual BSD/GPL"); 2048