1 /* 2 * f_ncm.c -- USB CDC Network (NCM) link function driver 3 * 4 * Copyright (C) 2010 Nokia Corporation 5 * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com> 6 * 7 * The driver borrows from f_ecm.c which is: 8 * 9 * Copyright (C) 2003-2005,2008 David Brownell 10 * Copyright (C) 2008 Nokia Corporation 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/interrupt.h> 20 #include <linux/module.h> 21 #include <linux/device.h> 22 #include <linux/etherdevice.h> 23 #include <linux/crc32.h> 24 25 #include <linux/usb/cdc.h> 26 27 #include "u_ether.h" 28 #include "u_ether_configfs.h" 29 #include "u_ncm.h" 30 31 /* 32 * This function is a "CDC Network Control Model" (CDC NCM) Ethernet link. 33 * NCM is intended to be used with high-speed network attachments. 34 * 35 * Note that NCM requires the use of "alternate settings" for its data 36 * interface. This means that the set_alt() method has real work to do, 37 * and also means that a get_alt() method is required. 38 */ 39 40 /* to trigger crc/non-crc ndp signature */ 41 42 #define NCM_NDP_HDR_CRC_MASK 0x01000000 43 #define NCM_NDP_HDR_CRC 0x01000000 44 #define NCM_NDP_HDR_NOCRC 0x00000000 45 46 enum ncm_notify_state { 47 NCM_NOTIFY_NONE, /* don't notify */ 48 NCM_NOTIFY_CONNECT, /* issue CONNECT next */ 49 NCM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */ 50 }; 51 52 struct f_ncm { 53 struct gether port; 54 u8 ctrl_id, data_id; 55 56 char ethaddr[14]; 57 58 struct usb_ep *notify; 59 struct usb_request *notify_req; 60 u8 notify_state; 61 bool is_open; 62 63 const struct ndp_parser_opts *parser_opts; 64 bool is_crc; 65 u32 ndp_sign; 66 67 /* 68 * for notification, it is accessed from both 69 * callback and ethernet open/close 70 */ 71 spinlock_t lock; 72 73 struct net_device *netdev; 74 75 /* For multi-frame NDP TX */ 76 struct sk_buff *skb_tx_data; 77 struct sk_buff *skb_tx_ndp; 78 u16 ndp_dgram_count; 79 bool timer_force_tx; 80 struct tasklet_struct tx_tasklet; 81 struct hrtimer task_timer; 82 83 bool timer_stopping; 84 }; 85 86 static inline struct f_ncm *func_to_ncm(struct usb_function *f) 87 { 88 return container_of(f, struct f_ncm, port.func); 89 } 90 91 /* peak (theoretical) bulk transfer rate in bits-per-second */ 92 static inline unsigned ncm_bitrate(struct usb_gadget *g) 93 { 94 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) 95 return 13 * 1024 * 8 * 1000 * 8; 96 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) 97 return 13 * 512 * 8 * 1000 * 8; 98 else 99 return 19 * 64 * 1 * 1000 * 8; 100 } 101 102 /*-------------------------------------------------------------------------*/ 103 104 /* 105 * We cannot group frames so use just the minimal size which ok to put 106 * one max-size ethernet frame. 107 * If the host can group frames, allow it to do that, 16K is selected, 108 * because it's used by default by the current linux host driver 109 */ 110 #define NTB_DEFAULT_IN_SIZE 16384 111 #define NTB_OUT_SIZE 16384 112 113 /* Allocation for storing the NDP, 32 should suffice for a 114 * 16k packet. This allows a maximum of 32 * 507 Byte packets to 115 * be transmitted in a single 16kB skb, though when sending full size 116 * packets this limit will be plenty. 117 * Smaller packets are not likely to be trying to maximize the 118 * throughput and will be mstly sending smaller infrequent frames. 119 */ 120 #define TX_MAX_NUM_DPE 32 121 122 /* Delay for the transmit to wait before sending an unfilled NTB frame. */ 123 #define TX_TIMEOUT_NSECS 300000 124 125 #define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \ 126 USB_CDC_NCM_NTB32_SUPPORTED) 127 128 static struct usb_cdc_ncm_ntb_parameters ntb_parameters = { 129 .wLength = cpu_to_le16(sizeof(ntb_parameters)), 130 .bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED), 131 .dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE), 132 .wNdpInDivisor = cpu_to_le16(4), 133 .wNdpInPayloadRemainder = cpu_to_le16(0), 134 .wNdpInAlignment = cpu_to_le16(4), 135 136 .dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE), 137 .wNdpOutDivisor = cpu_to_le16(4), 138 .wNdpOutPayloadRemainder = cpu_to_le16(0), 139 .wNdpOutAlignment = cpu_to_le16(4), 140 }; 141 142 /* 143 * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one 144 * packet, to simplify cancellation; and a big transfer interval, to 145 * waste less bandwidth. 146 */ 147 148 #define NCM_STATUS_INTERVAL_MS 32 149 #define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */ 150 151 static struct usb_interface_assoc_descriptor ncm_iad_desc = { 152 .bLength = sizeof ncm_iad_desc, 153 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 154 155 /* .bFirstInterface = DYNAMIC, */ 156 .bInterfaceCount = 2, /* control + data */ 157 .bFunctionClass = USB_CLASS_COMM, 158 .bFunctionSubClass = USB_CDC_SUBCLASS_NCM, 159 .bFunctionProtocol = USB_CDC_PROTO_NONE, 160 /* .iFunction = DYNAMIC */ 161 }; 162 163 /* interface descriptor: */ 164 165 static struct usb_interface_descriptor ncm_control_intf = { 166 .bLength = sizeof ncm_control_intf, 167 .bDescriptorType = USB_DT_INTERFACE, 168 169 /* .bInterfaceNumber = DYNAMIC */ 170 .bNumEndpoints = 1, 171 .bInterfaceClass = USB_CLASS_COMM, 172 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, 173 .bInterfaceProtocol = USB_CDC_PROTO_NONE, 174 /* .iInterface = DYNAMIC */ 175 }; 176 177 static struct usb_cdc_header_desc ncm_header_desc = { 178 .bLength = sizeof ncm_header_desc, 179 .bDescriptorType = USB_DT_CS_INTERFACE, 180 .bDescriptorSubType = USB_CDC_HEADER_TYPE, 181 182 .bcdCDC = cpu_to_le16(0x0110), 183 }; 184 185 static struct usb_cdc_union_desc ncm_union_desc = { 186 .bLength = sizeof(ncm_union_desc), 187 .bDescriptorType = USB_DT_CS_INTERFACE, 188 .bDescriptorSubType = USB_CDC_UNION_TYPE, 189 /* .bMasterInterface0 = DYNAMIC */ 190 /* .bSlaveInterface0 = DYNAMIC */ 191 }; 192 193 static struct usb_cdc_ether_desc ecm_desc = { 194 .bLength = sizeof ecm_desc, 195 .bDescriptorType = USB_DT_CS_INTERFACE, 196 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE, 197 198 /* this descriptor actually adds value, surprise! */ 199 /* .iMACAddress = DYNAMIC */ 200 .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */ 201 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN), 202 .wNumberMCFilters = cpu_to_le16(0), 203 .bNumberPowerFilters = 0, 204 }; 205 206 #define NCAPS (USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE) 207 208 static struct usb_cdc_ncm_desc ncm_desc = { 209 .bLength = sizeof ncm_desc, 210 .bDescriptorType = USB_DT_CS_INTERFACE, 211 .bDescriptorSubType = USB_CDC_NCM_TYPE, 212 213 .bcdNcmVersion = cpu_to_le16(0x0100), 214 /* can process SetEthernetPacketFilter */ 215 .bmNetworkCapabilities = NCAPS, 216 }; 217 218 /* the default data interface has no endpoints ... */ 219 220 static struct usb_interface_descriptor ncm_data_nop_intf = { 221 .bLength = sizeof ncm_data_nop_intf, 222 .bDescriptorType = USB_DT_INTERFACE, 223 224 .bInterfaceNumber = 1, 225 .bAlternateSetting = 0, 226 .bNumEndpoints = 0, 227 .bInterfaceClass = USB_CLASS_CDC_DATA, 228 .bInterfaceSubClass = 0, 229 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB, 230 /* .iInterface = DYNAMIC */ 231 }; 232 233 /* ... but the "real" data interface has two bulk endpoints */ 234 235 static struct usb_interface_descriptor ncm_data_intf = { 236 .bLength = sizeof ncm_data_intf, 237 .bDescriptorType = USB_DT_INTERFACE, 238 239 .bInterfaceNumber = 1, 240 .bAlternateSetting = 1, 241 .bNumEndpoints = 2, 242 .bInterfaceClass = USB_CLASS_CDC_DATA, 243 .bInterfaceSubClass = 0, 244 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB, 245 /* .iInterface = DYNAMIC */ 246 }; 247 248 /* full speed support: */ 249 250 static struct usb_endpoint_descriptor fs_ncm_notify_desc = { 251 .bLength = USB_DT_ENDPOINT_SIZE, 252 .bDescriptorType = USB_DT_ENDPOINT, 253 254 .bEndpointAddress = USB_DIR_IN, 255 .bmAttributes = USB_ENDPOINT_XFER_INT, 256 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), 257 .bInterval = NCM_STATUS_INTERVAL_MS, 258 }; 259 260 static struct usb_endpoint_descriptor fs_ncm_in_desc = { 261 .bLength = USB_DT_ENDPOINT_SIZE, 262 .bDescriptorType = USB_DT_ENDPOINT, 263 264 .bEndpointAddress = USB_DIR_IN, 265 .bmAttributes = USB_ENDPOINT_XFER_BULK, 266 }; 267 268 static struct usb_endpoint_descriptor fs_ncm_out_desc = { 269 .bLength = USB_DT_ENDPOINT_SIZE, 270 .bDescriptorType = USB_DT_ENDPOINT, 271 272 .bEndpointAddress = USB_DIR_OUT, 273 .bmAttributes = USB_ENDPOINT_XFER_BULK, 274 }; 275 276 static struct usb_descriptor_header *ncm_fs_function[] = { 277 (struct usb_descriptor_header *) &ncm_iad_desc, 278 /* CDC NCM control descriptors */ 279 (struct usb_descriptor_header *) &ncm_control_intf, 280 (struct usb_descriptor_header *) &ncm_header_desc, 281 (struct usb_descriptor_header *) &ncm_union_desc, 282 (struct usb_descriptor_header *) &ecm_desc, 283 (struct usb_descriptor_header *) &ncm_desc, 284 (struct usb_descriptor_header *) &fs_ncm_notify_desc, 285 /* data interface, altsettings 0 and 1 */ 286 (struct usb_descriptor_header *) &ncm_data_nop_intf, 287 (struct usb_descriptor_header *) &ncm_data_intf, 288 (struct usb_descriptor_header *) &fs_ncm_in_desc, 289 (struct usb_descriptor_header *) &fs_ncm_out_desc, 290 NULL, 291 }; 292 293 /* high speed support: */ 294 295 static struct usb_endpoint_descriptor hs_ncm_notify_desc = { 296 .bLength = USB_DT_ENDPOINT_SIZE, 297 .bDescriptorType = USB_DT_ENDPOINT, 298 299 .bEndpointAddress = USB_DIR_IN, 300 .bmAttributes = USB_ENDPOINT_XFER_INT, 301 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), 302 .bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS), 303 }; 304 static struct usb_endpoint_descriptor hs_ncm_in_desc = { 305 .bLength = USB_DT_ENDPOINT_SIZE, 306 .bDescriptorType = USB_DT_ENDPOINT, 307 308 .bEndpointAddress = USB_DIR_IN, 309 .bmAttributes = USB_ENDPOINT_XFER_BULK, 310 .wMaxPacketSize = cpu_to_le16(512), 311 }; 312 313 static struct usb_endpoint_descriptor hs_ncm_out_desc = { 314 .bLength = USB_DT_ENDPOINT_SIZE, 315 .bDescriptorType = USB_DT_ENDPOINT, 316 317 .bEndpointAddress = USB_DIR_OUT, 318 .bmAttributes = USB_ENDPOINT_XFER_BULK, 319 .wMaxPacketSize = cpu_to_le16(512), 320 }; 321 322 static struct usb_descriptor_header *ncm_hs_function[] = { 323 (struct usb_descriptor_header *) &ncm_iad_desc, 324 /* CDC NCM control descriptors */ 325 (struct usb_descriptor_header *) &ncm_control_intf, 326 (struct usb_descriptor_header *) &ncm_header_desc, 327 (struct usb_descriptor_header *) &ncm_union_desc, 328 (struct usb_descriptor_header *) &ecm_desc, 329 (struct usb_descriptor_header *) &ncm_desc, 330 (struct usb_descriptor_header *) &hs_ncm_notify_desc, 331 /* data interface, altsettings 0 and 1 */ 332 (struct usb_descriptor_header *) &ncm_data_nop_intf, 333 (struct usb_descriptor_header *) &ncm_data_intf, 334 (struct usb_descriptor_header *) &hs_ncm_in_desc, 335 (struct usb_descriptor_header *) &hs_ncm_out_desc, 336 NULL, 337 }; 338 339 340 /* super speed support: */ 341 342 static struct usb_endpoint_descriptor ss_ncm_notify_desc = { 343 .bLength = USB_DT_ENDPOINT_SIZE, 344 .bDescriptorType = USB_DT_ENDPOINT, 345 346 .bEndpointAddress = USB_DIR_IN, 347 .bmAttributes = USB_ENDPOINT_XFER_INT, 348 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), 349 .bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS) 350 }; 351 352 static struct usb_ss_ep_comp_descriptor ss_ncm_notify_comp_desc = { 353 .bLength = sizeof(ss_ncm_notify_comp_desc), 354 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 355 356 /* the following 3 values can be tweaked if necessary */ 357 /* .bMaxBurst = 0, */ 358 /* .bmAttributes = 0, */ 359 .wBytesPerInterval = cpu_to_le16(NCM_STATUS_BYTECOUNT), 360 }; 361 362 static struct usb_endpoint_descriptor ss_ncm_in_desc = { 363 .bLength = USB_DT_ENDPOINT_SIZE, 364 .bDescriptorType = USB_DT_ENDPOINT, 365 366 .bEndpointAddress = USB_DIR_IN, 367 .bmAttributes = USB_ENDPOINT_XFER_BULK, 368 .wMaxPacketSize = cpu_to_le16(1024), 369 }; 370 371 static struct usb_endpoint_descriptor ss_ncm_out_desc = { 372 .bLength = USB_DT_ENDPOINT_SIZE, 373 .bDescriptorType = USB_DT_ENDPOINT, 374 375 .bEndpointAddress = USB_DIR_OUT, 376 .bmAttributes = USB_ENDPOINT_XFER_BULK, 377 .wMaxPacketSize = cpu_to_le16(1024), 378 }; 379 380 static struct usb_ss_ep_comp_descriptor ss_ncm_bulk_comp_desc = { 381 .bLength = sizeof(ss_ncm_bulk_comp_desc), 382 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, 383 384 /* the following 2 values can be tweaked if necessary */ 385 /* .bMaxBurst = 0, */ 386 /* .bmAttributes = 0, */ 387 }; 388 389 static struct usb_descriptor_header *ncm_ss_function[] = { 390 (struct usb_descriptor_header *) &ncm_iad_desc, 391 /* CDC NCM control descriptors */ 392 (struct usb_descriptor_header *) &ncm_control_intf, 393 (struct usb_descriptor_header *) &ncm_header_desc, 394 (struct usb_descriptor_header *) &ncm_union_desc, 395 (struct usb_descriptor_header *) &ecm_desc, 396 (struct usb_descriptor_header *) &ncm_desc, 397 (struct usb_descriptor_header *) &ss_ncm_notify_desc, 398 (struct usb_descriptor_header *) &ss_ncm_notify_comp_desc, 399 /* data interface, altsettings 0 and 1 */ 400 (struct usb_descriptor_header *) &ncm_data_nop_intf, 401 (struct usb_descriptor_header *) &ncm_data_intf, 402 (struct usb_descriptor_header *) &ss_ncm_in_desc, 403 (struct usb_descriptor_header *) &ss_ncm_bulk_comp_desc, 404 (struct usb_descriptor_header *) &ss_ncm_out_desc, 405 (struct usb_descriptor_header *) &ss_ncm_bulk_comp_desc, 406 NULL, 407 }; 408 409 /* string descriptors: */ 410 411 #define STRING_CTRL_IDX 0 412 #define STRING_MAC_IDX 1 413 #define STRING_DATA_IDX 2 414 #define STRING_IAD_IDX 3 415 416 static struct usb_string ncm_string_defs[] = { 417 [STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)", 418 [STRING_MAC_IDX].s = "", 419 [STRING_DATA_IDX].s = "CDC Network Data", 420 [STRING_IAD_IDX].s = "CDC NCM", 421 { } /* end of list */ 422 }; 423 424 static struct usb_gadget_strings ncm_string_table = { 425 .language = 0x0409, /* en-us */ 426 .strings = ncm_string_defs, 427 }; 428 429 static struct usb_gadget_strings *ncm_strings[] = { 430 &ncm_string_table, 431 NULL, 432 }; 433 434 /* 435 * Here are options for NCM Datagram Pointer table (NDP) parser. 436 * There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3), 437 * in NDP16 offsets and sizes fields are 1 16bit word wide, 438 * in NDP32 -- 2 16bit words wide. Also signatures are different. 439 * To make the parser code the same, put the differences in the structure, 440 * and switch pointers to the structures when the format is changed. 441 */ 442 443 struct ndp_parser_opts { 444 u32 nth_sign; 445 u32 ndp_sign; 446 unsigned nth_size; 447 unsigned ndp_size; 448 unsigned dpe_size; 449 unsigned ndplen_align; 450 /* sizes in u16 units */ 451 unsigned dgram_item_len; /* index or length */ 452 unsigned block_length; 453 unsigned ndp_index; 454 unsigned reserved1; 455 unsigned reserved2; 456 unsigned next_ndp_index; 457 }; 458 459 #define INIT_NDP16_OPTS { \ 460 .nth_sign = USB_CDC_NCM_NTH16_SIGN, \ 461 .ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN, \ 462 .nth_size = sizeof(struct usb_cdc_ncm_nth16), \ 463 .ndp_size = sizeof(struct usb_cdc_ncm_ndp16), \ 464 .dpe_size = sizeof(struct usb_cdc_ncm_dpe16), \ 465 .ndplen_align = 4, \ 466 .dgram_item_len = 1, \ 467 .block_length = 1, \ 468 .ndp_index = 1, \ 469 .reserved1 = 0, \ 470 .reserved2 = 0, \ 471 .next_ndp_index = 1, \ 472 } 473 474 475 #define INIT_NDP32_OPTS { \ 476 .nth_sign = USB_CDC_NCM_NTH32_SIGN, \ 477 .ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN, \ 478 .nth_size = sizeof(struct usb_cdc_ncm_nth32), \ 479 .ndp_size = sizeof(struct usb_cdc_ncm_ndp32), \ 480 .dpe_size = sizeof(struct usb_cdc_ncm_dpe32), \ 481 .ndplen_align = 8, \ 482 .dgram_item_len = 2, \ 483 .block_length = 2, \ 484 .ndp_index = 2, \ 485 .reserved1 = 1, \ 486 .reserved2 = 2, \ 487 .next_ndp_index = 2, \ 488 } 489 490 static const struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS; 491 static const struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS; 492 493 static inline void put_ncm(__le16 **p, unsigned size, unsigned val) 494 { 495 switch (size) { 496 case 1: 497 put_unaligned_le16((u16)val, *p); 498 break; 499 case 2: 500 put_unaligned_le32((u32)val, *p); 501 502 break; 503 default: 504 BUG(); 505 } 506 507 *p += size; 508 } 509 510 static inline unsigned get_ncm(__le16 **p, unsigned size) 511 { 512 unsigned tmp; 513 514 switch (size) { 515 case 1: 516 tmp = get_unaligned_le16(*p); 517 break; 518 case 2: 519 tmp = get_unaligned_le32(*p); 520 break; 521 default: 522 BUG(); 523 } 524 525 *p += size; 526 return tmp; 527 } 528 529 /*-------------------------------------------------------------------------*/ 530 531 static inline void ncm_reset_values(struct f_ncm *ncm) 532 { 533 ncm->parser_opts = &ndp16_opts; 534 ncm->is_crc = false; 535 ncm->port.cdc_filter = DEFAULT_FILTER; 536 537 /* doesn't make sense for ncm, fixed size used */ 538 ncm->port.header_len = 0; 539 540 ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize); 541 ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE; 542 } 543 544 /* 545 * Context: ncm->lock held 546 */ 547 static void ncm_do_notify(struct f_ncm *ncm) 548 { 549 struct usb_request *req = ncm->notify_req; 550 struct usb_cdc_notification *event; 551 struct usb_composite_dev *cdev = ncm->port.func.config->cdev; 552 __le32 *data; 553 int status; 554 555 /* notification already in flight? */ 556 if (!req) 557 return; 558 559 event = req->buf; 560 switch (ncm->notify_state) { 561 case NCM_NOTIFY_NONE: 562 return; 563 564 case NCM_NOTIFY_CONNECT: 565 event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION; 566 if (ncm->is_open) 567 event->wValue = cpu_to_le16(1); 568 else 569 event->wValue = cpu_to_le16(0); 570 event->wLength = 0; 571 req->length = sizeof *event; 572 573 DBG(cdev, "notify connect %s\n", 574 ncm->is_open ? "true" : "false"); 575 ncm->notify_state = NCM_NOTIFY_NONE; 576 break; 577 578 case NCM_NOTIFY_SPEED: 579 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE; 580 event->wValue = cpu_to_le16(0); 581 event->wLength = cpu_to_le16(8); 582 req->length = NCM_STATUS_BYTECOUNT; 583 584 /* SPEED_CHANGE data is up/down speeds in bits/sec */ 585 data = req->buf + sizeof *event; 586 data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget)); 587 data[1] = data[0]; 588 589 DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget)); 590 ncm->notify_state = NCM_NOTIFY_CONNECT; 591 break; 592 } 593 event->bmRequestType = 0xA1; 594 event->wIndex = cpu_to_le16(ncm->ctrl_id); 595 596 ncm->notify_req = NULL; 597 /* 598 * In double buffering if there is a space in FIFO, 599 * completion callback can be called right after the call, 600 * so unlocking 601 */ 602 spin_unlock(&ncm->lock); 603 status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC); 604 spin_lock(&ncm->lock); 605 if (status < 0) { 606 ncm->notify_req = req; 607 DBG(cdev, "notify --> %d\n", status); 608 } 609 } 610 611 /* 612 * Context: ncm->lock held 613 */ 614 static void ncm_notify(struct f_ncm *ncm) 615 { 616 /* 617 * NOTE on most versions of Linux, host side cdc-ethernet 618 * won't listen for notifications until its netdevice opens. 619 * The first notification then sits in the FIFO for a long 620 * time, and the second one is queued. 621 * 622 * If ncm_notify() is called before the second (CONNECT) 623 * notification is sent, then it will reset to send the SPEED 624 * notificaion again (and again, and again), but it's not a problem 625 */ 626 ncm->notify_state = NCM_NOTIFY_SPEED; 627 ncm_do_notify(ncm); 628 } 629 630 static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req) 631 { 632 struct f_ncm *ncm = req->context; 633 struct usb_composite_dev *cdev = ncm->port.func.config->cdev; 634 struct usb_cdc_notification *event = req->buf; 635 636 spin_lock(&ncm->lock); 637 switch (req->status) { 638 case 0: 639 VDBG(cdev, "Notification %02x sent\n", 640 event->bNotificationType); 641 break; 642 case -ECONNRESET: 643 case -ESHUTDOWN: 644 ncm->notify_state = NCM_NOTIFY_NONE; 645 break; 646 default: 647 DBG(cdev, "event %02x --> %d\n", 648 event->bNotificationType, req->status); 649 break; 650 } 651 ncm->notify_req = req; 652 ncm_do_notify(ncm); 653 spin_unlock(&ncm->lock); 654 } 655 656 static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req) 657 { 658 /* now for SET_NTB_INPUT_SIZE only */ 659 unsigned in_size; 660 struct usb_function *f = req->context; 661 struct f_ncm *ncm = func_to_ncm(f); 662 struct usb_composite_dev *cdev = f->config->cdev; 663 664 req->context = NULL; 665 if (req->status || req->actual != req->length) { 666 DBG(cdev, "Bad control-OUT transfer\n"); 667 goto invalid; 668 } 669 670 in_size = get_unaligned_le32(req->buf); 671 if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE || 672 in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) { 673 DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size); 674 goto invalid; 675 } 676 677 ncm->port.fixed_in_len = in_size; 678 VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size); 679 return; 680 681 invalid: 682 usb_ep_set_halt(ep); 683 return; 684 } 685 686 static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 687 { 688 struct f_ncm *ncm = func_to_ncm(f); 689 struct usb_composite_dev *cdev = f->config->cdev; 690 struct usb_request *req = cdev->req; 691 int value = -EOPNOTSUPP; 692 u16 w_index = le16_to_cpu(ctrl->wIndex); 693 u16 w_value = le16_to_cpu(ctrl->wValue); 694 u16 w_length = le16_to_cpu(ctrl->wLength); 695 696 /* 697 * composite driver infrastructure handles everything except 698 * CDC class messages; interface activation uses set_alt(). 699 */ 700 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { 701 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 702 | USB_CDC_SET_ETHERNET_PACKET_FILTER: 703 /* 704 * see 6.2.30: no data, wIndex = interface, 705 * wValue = packet filter bitmap 706 */ 707 if (w_length != 0 || w_index != ncm->ctrl_id) 708 goto invalid; 709 DBG(cdev, "packet filter %02x\n", w_value); 710 /* 711 * REVISIT locking of cdc_filter. This assumes the UDC 712 * driver won't have a concurrent packet TX irq running on 713 * another CPU; or that if it does, this write is atomic... 714 */ 715 ncm->port.cdc_filter = w_value; 716 value = 0; 717 break; 718 /* 719 * and optionally: 720 * case USB_CDC_SEND_ENCAPSULATED_COMMAND: 721 * case USB_CDC_GET_ENCAPSULATED_RESPONSE: 722 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS: 723 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER: 724 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER: 725 * case USB_CDC_GET_ETHERNET_STATISTIC: 726 */ 727 728 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 729 | USB_CDC_GET_NTB_PARAMETERS: 730 731 if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id) 732 goto invalid; 733 value = w_length > sizeof ntb_parameters ? 734 sizeof ntb_parameters : w_length; 735 memcpy(req->buf, &ntb_parameters, value); 736 VDBG(cdev, "Host asked NTB parameters\n"); 737 break; 738 739 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 740 | USB_CDC_GET_NTB_INPUT_SIZE: 741 742 if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id) 743 goto invalid; 744 put_unaligned_le32(ncm->port.fixed_in_len, req->buf); 745 value = 4; 746 VDBG(cdev, "Host asked INPUT SIZE, sending %d\n", 747 ncm->port.fixed_in_len); 748 break; 749 750 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 751 | USB_CDC_SET_NTB_INPUT_SIZE: 752 { 753 if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id) 754 goto invalid; 755 req->complete = ncm_ep0out_complete; 756 req->length = w_length; 757 req->context = f; 758 759 value = req->length; 760 break; 761 } 762 763 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 764 | USB_CDC_GET_NTB_FORMAT: 765 { 766 uint16_t format; 767 768 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id) 769 goto invalid; 770 format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001; 771 put_unaligned_le16(format, req->buf); 772 value = 2; 773 VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format); 774 break; 775 } 776 777 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 778 | USB_CDC_SET_NTB_FORMAT: 779 { 780 if (w_length != 0 || w_index != ncm->ctrl_id) 781 goto invalid; 782 switch (w_value) { 783 case 0x0000: 784 ncm->parser_opts = &ndp16_opts; 785 DBG(cdev, "NCM16 selected\n"); 786 break; 787 case 0x0001: 788 ncm->parser_opts = &ndp32_opts; 789 DBG(cdev, "NCM32 selected\n"); 790 break; 791 default: 792 goto invalid; 793 } 794 value = 0; 795 break; 796 } 797 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 798 | USB_CDC_GET_CRC_MODE: 799 { 800 uint16_t is_crc; 801 802 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id) 803 goto invalid; 804 is_crc = ncm->is_crc ? 0x0001 : 0x0000; 805 put_unaligned_le16(is_crc, req->buf); 806 value = 2; 807 VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc); 808 break; 809 } 810 811 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8) 812 | USB_CDC_SET_CRC_MODE: 813 { 814 int ndp_hdr_crc = 0; 815 816 if (w_length != 0 || w_index != ncm->ctrl_id) 817 goto invalid; 818 switch (w_value) { 819 case 0x0000: 820 ncm->is_crc = false; 821 ndp_hdr_crc = NCM_NDP_HDR_NOCRC; 822 DBG(cdev, "non-CRC mode selected\n"); 823 break; 824 case 0x0001: 825 ncm->is_crc = true; 826 ndp_hdr_crc = NCM_NDP_HDR_CRC; 827 DBG(cdev, "CRC mode selected\n"); 828 break; 829 default: 830 goto invalid; 831 } 832 ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc; 833 value = 0; 834 break; 835 } 836 837 /* and disabled in ncm descriptor: */ 838 /* case USB_CDC_GET_NET_ADDRESS: */ 839 /* case USB_CDC_SET_NET_ADDRESS: */ 840 /* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */ 841 /* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */ 842 843 default: 844 invalid: 845 DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 846 ctrl->bRequestType, ctrl->bRequest, 847 w_value, w_index, w_length); 848 } 849 850 /* respond with data transfer or status phase? */ 851 if (value >= 0) { 852 DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n", 853 ctrl->bRequestType, ctrl->bRequest, 854 w_value, w_index, w_length); 855 req->zero = 0; 856 req->length = value; 857 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 858 if (value < 0) 859 ERROR(cdev, "ncm req %02x.%02x response err %d\n", 860 ctrl->bRequestType, ctrl->bRequest, 861 value); 862 } 863 864 /* device either stalls (value < 0) or reports success */ 865 return value; 866 } 867 868 869 static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 870 { 871 struct f_ncm *ncm = func_to_ncm(f); 872 struct usb_composite_dev *cdev = f->config->cdev; 873 874 /* Control interface has only altsetting 0 */ 875 if (intf == ncm->ctrl_id) { 876 if (alt != 0) 877 goto fail; 878 879 DBG(cdev, "reset ncm control %d\n", intf); 880 usb_ep_disable(ncm->notify); 881 882 if (!(ncm->notify->desc)) { 883 DBG(cdev, "init ncm ctrl %d\n", intf); 884 if (config_ep_by_speed(cdev->gadget, f, ncm->notify)) 885 goto fail; 886 } 887 usb_ep_enable(ncm->notify); 888 889 /* Data interface has two altsettings, 0 and 1 */ 890 } else if (intf == ncm->data_id) { 891 if (alt > 1) 892 goto fail; 893 894 if (ncm->port.in_ep->enabled) { 895 DBG(cdev, "reset ncm\n"); 896 ncm->timer_stopping = true; 897 ncm->netdev = NULL; 898 gether_disconnect(&ncm->port); 899 ncm_reset_values(ncm); 900 } 901 902 /* 903 * CDC Network only sends data in non-default altsettings. 904 * Changing altsettings resets filters, statistics, etc. 905 */ 906 if (alt == 1) { 907 struct net_device *net; 908 909 if (!ncm->port.in_ep->desc || 910 !ncm->port.out_ep->desc) { 911 DBG(cdev, "init ncm\n"); 912 if (config_ep_by_speed(cdev->gadget, f, 913 ncm->port.in_ep) || 914 config_ep_by_speed(cdev->gadget, f, 915 ncm->port.out_ep)) { 916 ncm->port.in_ep->desc = NULL; 917 ncm->port.out_ep->desc = NULL; 918 goto fail; 919 } 920 } 921 922 /* TODO */ 923 /* Enable zlps by default for NCM conformance; 924 * override for musb_hdrc (avoids txdma ovhead) 925 */ 926 ncm->port.is_zlp_ok = 927 gadget_is_zlp_supported(cdev->gadget); 928 ncm->port.no_skb_reserve = 929 gadget_avoids_skb_reserve(cdev->gadget); 930 ncm->port.cdc_filter = DEFAULT_FILTER; 931 DBG(cdev, "activate ncm\n"); 932 net = gether_connect(&ncm->port); 933 if (IS_ERR(net)) 934 return PTR_ERR(net); 935 ncm->netdev = net; 936 ncm->timer_stopping = false; 937 } 938 939 spin_lock(&ncm->lock); 940 ncm_notify(ncm); 941 spin_unlock(&ncm->lock); 942 } else 943 goto fail; 944 945 return 0; 946 fail: 947 return -EINVAL; 948 } 949 950 /* 951 * Because the data interface supports multiple altsettings, 952 * this NCM function *MUST* implement a get_alt() method. 953 */ 954 static int ncm_get_alt(struct usb_function *f, unsigned intf) 955 { 956 struct f_ncm *ncm = func_to_ncm(f); 957 958 if (intf == ncm->ctrl_id) 959 return 0; 960 return ncm->port.in_ep->enabled ? 1 : 0; 961 } 962 963 static struct sk_buff *package_for_tx(struct f_ncm *ncm) 964 { 965 __le16 *ntb_iter; 966 struct sk_buff *skb2 = NULL; 967 unsigned ndp_pad; 968 unsigned ndp_index; 969 unsigned new_len; 970 971 const struct ndp_parser_opts *opts = ncm->parser_opts; 972 const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment); 973 const int dgram_idx_len = 2 * 2 * opts->dgram_item_len; 974 975 /* Stop the timer */ 976 hrtimer_try_to_cancel(&ncm->task_timer); 977 978 ndp_pad = ALIGN(ncm->skb_tx_data->len, ndp_align) - 979 ncm->skb_tx_data->len; 980 ndp_index = ncm->skb_tx_data->len + ndp_pad; 981 new_len = ndp_index + dgram_idx_len + ncm->skb_tx_ndp->len; 982 983 /* Set the final BlockLength and wNdpIndex */ 984 ntb_iter = (void *) ncm->skb_tx_data->data; 985 /* Increment pointer to BlockLength */ 986 ntb_iter += 2 + 1 + 1; 987 put_ncm(&ntb_iter, opts->block_length, new_len); 988 put_ncm(&ntb_iter, opts->ndp_index, ndp_index); 989 990 /* Set the final NDP wLength */ 991 new_len = opts->ndp_size + 992 (ncm->ndp_dgram_count * dgram_idx_len); 993 ncm->ndp_dgram_count = 0; 994 /* Increment from start to wLength */ 995 ntb_iter = (void *) ncm->skb_tx_ndp->data; 996 ntb_iter += 2; 997 put_unaligned_le16(new_len, ntb_iter); 998 999 /* Merge the skbs */ 1000 swap(skb2, ncm->skb_tx_data); 1001 if (ncm->skb_tx_data) { 1002 dev_consume_skb_any(ncm->skb_tx_data); 1003 ncm->skb_tx_data = NULL; 1004 } 1005 1006 /* Insert NDP alignment. */ 1007 skb_put_zero(skb2, ndp_pad); 1008 1009 /* Copy NTB across. */ 1010 skb_put_data(skb2, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len); 1011 dev_consume_skb_any(ncm->skb_tx_ndp); 1012 ncm->skb_tx_ndp = NULL; 1013 1014 /* Insert zero'd datagram. */ 1015 skb_put_zero(skb2, dgram_idx_len); 1016 1017 return skb2; 1018 } 1019 1020 static struct sk_buff *ncm_wrap_ntb(struct gether *port, 1021 struct sk_buff *skb) 1022 { 1023 struct f_ncm *ncm = func_to_ncm(&port->func); 1024 struct sk_buff *skb2 = NULL; 1025 int ncb_len = 0; 1026 __le16 *ntb_data; 1027 __le16 *ntb_ndp; 1028 int dgram_pad; 1029 1030 unsigned max_size = ncm->port.fixed_in_len; 1031 const struct ndp_parser_opts *opts = ncm->parser_opts; 1032 const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment); 1033 const int div = le16_to_cpu(ntb_parameters.wNdpInDivisor); 1034 const int rem = le16_to_cpu(ntb_parameters.wNdpInPayloadRemainder); 1035 const int dgram_idx_len = 2 * 2 * opts->dgram_item_len; 1036 1037 if (!skb && !ncm->skb_tx_data) 1038 return NULL; 1039 1040 if (skb) { 1041 /* Add the CRC if required up front */ 1042 if (ncm->is_crc) { 1043 uint32_t crc; 1044 __le16 *crc_pos; 1045 1046 crc = ~crc32_le(~0, 1047 skb->data, 1048 skb->len); 1049 crc_pos = skb_put(skb, sizeof(uint32_t)); 1050 put_unaligned_le32(crc, crc_pos); 1051 } 1052 1053 /* If the new skb is too big for the current NCM NTB then 1054 * set the current stored skb to be sent now and clear it 1055 * ready for new data. 1056 * NOTE: Assume maximum align for speed of calculation. 1057 */ 1058 if (ncm->skb_tx_data 1059 && (ncm->ndp_dgram_count >= TX_MAX_NUM_DPE 1060 || (ncm->skb_tx_data->len + 1061 div + rem + skb->len + 1062 ncm->skb_tx_ndp->len + ndp_align + (2 * dgram_idx_len)) 1063 > max_size)) { 1064 skb2 = package_for_tx(ncm); 1065 if (!skb2) 1066 goto err; 1067 } 1068 1069 if (!ncm->skb_tx_data) { 1070 ncb_len = opts->nth_size; 1071 dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len; 1072 ncb_len += dgram_pad; 1073 1074 /* Create a new skb for the NTH and datagrams. */ 1075 ncm->skb_tx_data = alloc_skb(max_size, GFP_ATOMIC); 1076 if (!ncm->skb_tx_data) 1077 goto err; 1078 1079 ncm->skb_tx_data->dev = ncm->netdev; 1080 ntb_data = skb_put_zero(ncm->skb_tx_data, ncb_len); 1081 /* dwSignature */ 1082 put_unaligned_le32(opts->nth_sign, ntb_data); 1083 ntb_data += 2; 1084 /* wHeaderLength */ 1085 put_unaligned_le16(opts->nth_size, ntb_data++); 1086 1087 /* Allocate an skb for storing the NDP, 1088 * TX_MAX_NUM_DPE should easily suffice for a 1089 * 16k packet. 1090 */ 1091 ncm->skb_tx_ndp = alloc_skb((int)(opts->ndp_size 1092 + opts->dpe_size 1093 * TX_MAX_NUM_DPE), 1094 GFP_ATOMIC); 1095 if (!ncm->skb_tx_ndp) 1096 goto err; 1097 1098 ncm->skb_tx_ndp->dev = ncm->netdev; 1099 ntb_ndp = skb_put(ncm->skb_tx_ndp, opts->ndp_size); 1100 memset(ntb_ndp, 0, ncb_len); 1101 /* dwSignature */ 1102 put_unaligned_le32(ncm->ndp_sign, ntb_ndp); 1103 ntb_ndp += 2; 1104 1105 /* There is always a zeroed entry */ 1106 ncm->ndp_dgram_count = 1; 1107 1108 /* Note: we skip opts->next_ndp_index */ 1109 } 1110 1111 /* Delay the timer. */ 1112 hrtimer_start(&ncm->task_timer, TX_TIMEOUT_NSECS, 1113 HRTIMER_MODE_REL); 1114 1115 /* Add the datagram position entries */ 1116 ntb_ndp = skb_put_zero(ncm->skb_tx_ndp, dgram_idx_len); 1117 1118 ncb_len = ncm->skb_tx_data->len; 1119 dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len; 1120 ncb_len += dgram_pad; 1121 1122 /* (d)wDatagramIndex */ 1123 put_ncm(&ntb_ndp, opts->dgram_item_len, ncb_len); 1124 /* (d)wDatagramLength */ 1125 put_ncm(&ntb_ndp, opts->dgram_item_len, skb->len); 1126 ncm->ndp_dgram_count++; 1127 1128 /* Add the new data to the skb */ 1129 skb_put_zero(ncm->skb_tx_data, dgram_pad); 1130 skb_put_data(ncm->skb_tx_data, skb->data, skb->len); 1131 dev_consume_skb_any(skb); 1132 skb = NULL; 1133 1134 } else if (ncm->skb_tx_data && ncm->timer_force_tx) { 1135 /* If the tx was requested because of a timeout then send */ 1136 skb2 = package_for_tx(ncm); 1137 if (!skb2) 1138 goto err; 1139 } 1140 1141 return skb2; 1142 1143 err: 1144 ncm->netdev->stats.tx_dropped++; 1145 1146 if (skb) 1147 dev_kfree_skb_any(skb); 1148 if (ncm->skb_tx_data) 1149 dev_kfree_skb_any(ncm->skb_tx_data); 1150 if (ncm->skb_tx_ndp) 1151 dev_kfree_skb_any(ncm->skb_tx_ndp); 1152 1153 return NULL; 1154 } 1155 1156 /* 1157 * This transmits the NTB if there are frames waiting. 1158 */ 1159 static void ncm_tx_tasklet(unsigned long data) 1160 { 1161 struct f_ncm *ncm = (void *)data; 1162 1163 if (ncm->timer_stopping) 1164 return; 1165 1166 /* Only send if data is available. */ 1167 if (ncm->skb_tx_data) { 1168 ncm->timer_force_tx = true; 1169 1170 /* XXX This allowance of a NULL skb argument to ndo_start_xmit 1171 * XXX is not sane. The gadget layer should be redesigned so 1172 * XXX that the dev->wrap() invocations to build SKBs is transparent 1173 * XXX and performed in some way outside of the ndo_start_xmit 1174 * XXX interface. 1175 */ 1176 ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev); 1177 1178 ncm->timer_force_tx = false; 1179 } 1180 } 1181 1182 /* 1183 * The transmit should only be run if no skb data has been sent 1184 * for a certain duration. 1185 */ 1186 static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data) 1187 { 1188 struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer); 1189 tasklet_schedule(&ncm->tx_tasklet); 1190 return HRTIMER_NORESTART; 1191 } 1192 1193 static int ncm_unwrap_ntb(struct gether *port, 1194 struct sk_buff *skb, 1195 struct sk_buff_head *list) 1196 { 1197 struct f_ncm *ncm = func_to_ncm(&port->func); 1198 __le16 *tmp = (void *) skb->data; 1199 unsigned index, index2; 1200 int ndp_index; 1201 unsigned dg_len, dg_len2; 1202 unsigned ndp_len; 1203 struct sk_buff *skb2; 1204 int ret = -EINVAL; 1205 unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize); 1206 const struct ndp_parser_opts *opts = ncm->parser_opts; 1207 unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0; 1208 int dgram_counter; 1209 1210 /* dwSignature */ 1211 if (get_unaligned_le32(tmp) != opts->nth_sign) { 1212 INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n", 1213 skb->len); 1214 print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1, 1215 skb->data, 32, false); 1216 1217 goto err; 1218 } 1219 tmp += 2; 1220 /* wHeaderLength */ 1221 if (get_unaligned_le16(tmp++) != opts->nth_size) { 1222 INFO(port->func.config->cdev, "Wrong NTB headersize\n"); 1223 goto err; 1224 } 1225 tmp++; /* skip wSequence */ 1226 1227 /* (d)wBlockLength */ 1228 if (get_ncm(&tmp, opts->block_length) > max_size) { 1229 INFO(port->func.config->cdev, "OUT size exceeded\n"); 1230 goto err; 1231 } 1232 1233 ndp_index = get_ncm(&tmp, opts->ndp_index); 1234 1235 /* Run through all the NDP's in the NTB */ 1236 do { 1237 /* NCM 3.2 */ 1238 if (((ndp_index % 4) != 0) && 1239 (ndp_index < opts->nth_size)) { 1240 INFO(port->func.config->cdev, "Bad index: %#X\n", 1241 ndp_index); 1242 goto err; 1243 } 1244 1245 /* walk through NDP */ 1246 tmp = (void *)(skb->data + ndp_index); 1247 if (get_unaligned_le32(tmp) != ncm->ndp_sign) { 1248 INFO(port->func.config->cdev, "Wrong NDP SIGN\n"); 1249 goto err; 1250 } 1251 tmp += 2; 1252 1253 ndp_len = get_unaligned_le16(tmp++); 1254 /* 1255 * NCM 3.3.1 1256 * entry is 2 items 1257 * item size is 16/32 bits, opts->dgram_item_len * 2 bytes 1258 * minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry 1259 * Each entry is a dgram index and a dgram length. 1260 */ 1261 if ((ndp_len < opts->ndp_size 1262 + 2 * 2 * (opts->dgram_item_len * 2)) 1263 || (ndp_len % opts->ndplen_align != 0)) { 1264 INFO(port->func.config->cdev, "Bad NDP length: %#X\n", 1265 ndp_len); 1266 goto err; 1267 } 1268 tmp += opts->reserved1; 1269 /* Check for another NDP (d)wNextNdpIndex */ 1270 ndp_index = get_ncm(&tmp, opts->next_ndp_index); 1271 tmp += opts->reserved2; 1272 1273 ndp_len -= opts->ndp_size; 1274 index2 = get_ncm(&tmp, opts->dgram_item_len); 1275 dg_len2 = get_ncm(&tmp, opts->dgram_item_len); 1276 dgram_counter = 0; 1277 1278 do { 1279 index = index2; 1280 dg_len = dg_len2; 1281 if (dg_len < 14 + crc_len) { /* ethernet hdr + crc */ 1282 INFO(port->func.config->cdev, 1283 "Bad dgram length: %#X\n", dg_len); 1284 goto err; 1285 } 1286 if (ncm->is_crc) { 1287 uint32_t crc, crc2; 1288 1289 crc = get_unaligned_le32(skb->data + 1290 index + dg_len - 1291 crc_len); 1292 crc2 = ~crc32_le(~0, 1293 skb->data + index, 1294 dg_len - crc_len); 1295 if (crc != crc2) { 1296 INFO(port->func.config->cdev, 1297 "Bad CRC\n"); 1298 goto err; 1299 } 1300 } 1301 1302 index2 = get_ncm(&tmp, opts->dgram_item_len); 1303 dg_len2 = get_ncm(&tmp, opts->dgram_item_len); 1304 1305 /* 1306 * Copy the data into a new skb. 1307 * This ensures the truesize is correct 1308 */ 1309 skb2 = netdev_alloc_skb_ip_align(ncm->netdev, 1310 dg_len - crc_len); 1311 if (skb2 == NULL) 1312 goto err; 1313 skb_put_data(skb2, skb->data + index, 1314 dg_len - crc_len); 1315 1316 skb_queue_tail(list, skb2); 1317 1318 ndp_len -= 2 * (opts->dgram_item_len * 2); 1319 1320 dgram_counter++; 1321 1322 if (index2 == 0 || dg_len2 == 0) 1323 break; 1324 } while (ndp_len > 2 * (opts->dgram_item_len * 2)); 1325 } while (ndp_index); 1326 1327 dev_consume_skb_any(skb); 1328 1329 VDBG(port->func.config->cdev, 1330 "Parsed NTB with %d frames\n", dgram_counter); 1331 return 0; 1332 err: 1333 skb_queue_purge(list); 1334 dev_kfree_skb_any(skb); 1335 return ret; 1336 } 1337 1338 static void ncm_disable(struct usb_function *f) 1339 { 1340 struct f_ncm *ncm = func_to_ncm(f); 1341 struct usb_composite_dev *cdev = f->config->cdev; 1342 1343 DBG(cdev, "ncm deactivated\n"); 1344 1345 if (ncm->port.in_ep->enabled) { 1346 ncm->timer_stopping = true; 1347 ncm->netdev = NULL; 1348 gether_disconnect(&ncm->port); 1349 } 1350 1351 if (ncm->notify->enabled) { 1352 usb_ep_disable(ncm->notify); 1353 ncm->notify->desc = NULL; 1354 } 1355 } 1356 1357 /*-------------------------------------------------------------------------*/ 1358 1359 /* 1360 * Callbacks let us notify the host about connect/disconnect when the 1361 * net device is opened or closed. 1362 * 1363 * For testing, note that link states on this side include both opened 1364 * and closed variants of: 1365 * 1366 * - disconnected/unconfigured 1367 * - configured but inactive (data alt 0) 1368 * - configured and active (data alt 1) 1369 * 1370 * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and 1371 * SET_INTERFACE (altsetting). Remember also that "configured" doesn't 1372 * imply the host is actually polling the notification endpoint, and 1373 * likewise that "active" doesn't imply it's actually using the data 1374 * endpoints for traffic. 1375 */ 1376 1377 static void ncm_open(struct gether *geth) 1378 { 1379 struct f_ncm *ncm = func_to_ncm(&geth->func); 1380 1381 DBG(ncm->port.func.config->cdev, "%s\n", __func__); 1382 1383 spin_lock(&ncm->lock); 1384 ncm->is_open = true; 1385 ncm_notify(ncm); 1386 spin_unlock(&ncm->lock); 1387 } 1388 1389 static void ncm_close(struct gether *geth) 1390 { 1391 struct f_ncm *ncm = func_to_ncm(&geth->func); 1392 1393 DBG(ncm->port.func.config->cdev, "%s\n", __func__); 1394 1395 spin_lock(&ncm->lock); 1396 ncm->is_open = false; 1397 ncm_notify(ncm); 1398 spin_unlock(&ncm->lock); 1399 } 1400 1401 /*-------------------------------------------------------------------------*/ 1402 1403 /* ethernet function driver setup/binding */ 1404 1405 static int ncm_bind(struct usb_configuration *c, struct usb_function *f) 1406 { 1407 struct usb_composite_dev *cdev = c->cdev; 1408 struct f_ncm *ncm = func_to_ncm(f); 1409 struct usb_string *us; 1410 int status; 1411 struct usb_ep *ep; 1412 struct f_ncm_opts *ncm_opts; 1413 1414 if (!can_support_ecm(cdev->gadget)) 1415 return -EINVAL; 1416 1417 ncm_opts = container_of(f->fi, struct f_ncm_opts, func_inst); 1418 /* 1419 * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 1420 * configurations are bound in sequence with list_for_each_entry, 1421 * in each configuration its functions are bound in sequence 1422 * with list_for_each_entry, so we assume no race condition 1423 * with regard to ncm_opts->bound access 1424 */ 1425 if (!ncm_opts->bound) { 1426 mutex_lock(&ncm_opts->lock); 1427 gether_set_gadget(ncm_opts->net, cdev->gadget); 1428 status = gether_register_netdev(ncm_opts->net); 1429 mutex_unlock(&ncm_opts->lock); 1430 if (status) 1431 return status; 1432 ncm_opts->bound = true; 1433 } 1434 us = usb_gstrings_attach(cdev, ncm_strings, 1435 ARRAY_SIZE(ncm_string_defs)); 1436 if (IS_ERR(us)) 1437 return PTR_ERR(us); 1438 ncm_control_intf.iInterface = us[STRING_CTRL_IDX].id; 1439 ncm_data_nop_intf.iInterface = us[STRING_DATA_IDX].id; 1440 ncm_data_intf.iInterface = us[STRING_DATA_IDX].id; 1441 ecm_desc.iMACAddress = us[STRING_MAC_IDX].id; 1442 ncm_iad_desc.iFunction = us[STRING_IAD_IDX].id; 1443 1444 /* allocate instance-specific interface IDs */ 1445 status = usb_interface_id(c, f); 1446 if (status < 0) 1447 goto fail; 1448 ncm->ctrl_id = status; 1449 ncm_iad_desc.bFirstInterface = status; 1450 1451 ncm_control_intf.bInterfaceNumber = status; 1452 ncm_union_desc.bMasterInterface0 = status; 1453 1454 status = usb_interface_id(c, f); 1455 if (status < 0) 1456 goto fail; 1457 ncm->data_id = status; 1458 1459 ncm_data_nop_intf.bInterfaceNumber = status; 1460 ncm_data_intf.bInterfaceNumber = status; 1461 ncm_union_desc.bSlaveInterface0 = status; 1462 1463 status = -ENODEV; 1464 1465 /* allocate instance-specific endpoints */ 1466 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc); 1467 if (!ep) 1468 goto fail; 1469 ncm->port.in_ep = ep; 1470 1471 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc); 1472 if (!ep) 1473 goto fail; 1474 ncm->port.out_ep = ep; 1475 1476 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc); 1477 if (!ep) 1478 goto fail; 1479 ncm->notify = ep; 1480 1481 status = -ENOMEM; 1482 1483 /* allocate notification request and buffer */ 1484 ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL); 1485 if (!ncm->notify_req) 1486 goto fail; 1487 ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL); 1488 if (!ncm->notify_req->buf) 1489 goto fail; 1490 ncm->notify_req->context = ncm; 1491 ncm->notify_req->complete = ncm_notify_complete; 1492 1493 /* 1494 * support all relevant hardware speeds... we expect that when 1495 * hardware is dual speed, all bulk-capable endpoints work at 1496 * both speeds 1497 */ 1498 hs_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress; 1499 hs_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress; 1500 hs_ncm_notify_desc.bEndpointAddress = 1501 fs_ncm_notify_desc.bEndpointAddress; 1502 1503 ss_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress; 1504 ss_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress; 1505 ss_ncm_notify_desc.bEndpointAddress = 1506 fs_ncm_notify_desc.bEndpointAddress; 1507 1508 status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function, 1509 ncm_ss_function, NULL); 1510 if (status) 1511 goto fail; 1512 1513 /* 1514 * NOTE: all that is done without knowing or caring about 1515 * the network link ... which is unavailable to this code 1516 * until we're activated via set_alt(). 1517 */ 1518 1519 ncm->port.open = ncm_open; 1520 ncm->port.close = ncm_close; 1521 1522 tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm); 1523 hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 1524 ncm->task_timer.function = ncm_tx_timeout; 1525 1526 DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n", 1527 gadget_is_superspeed(c->cdev->gadget) ? "super" : 1528 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", 1529 ncm->port.in_ep->name, ncm->port.out_ep->name, 1530 ncm->notify->name); 1531 return 0; 1532 1533 fail: 1534 if (ncm->notify_req) { 1535 kfree(ncm->notify_req->buf); 1536 usb_ep_free_request(ncm->notify, ncm->notify_req); 1537 } 1538 1539 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); 1540 1541 return status; 1542 } 1543 1544 static inline struct f_ncm_opts *to_f_ncm_opts(struct config_item *item) 1545 { 1546 return container_of(to_config_group(item), struct f_ncm_opts, 1547 func_inst.group); 1548 } 1549 1550 /* f_ncm_item_ops */ 1551 USB_ETHERNET_CONFIGFS_ITEM(ncm); 1552 1553 /* f_ncm_opts_dev_addr */ 1554 USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(ncm); 1555 1556 /* f_ncm_opts_host_addr */ 1557 USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(ncm); 1558 1559 /* f_ncm_opts_qmult */ 1560 USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(ncm); 1561 1562 /* f_ncm_opts_ifname */ 1563 USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ncm); 1564 1565 static struct configfs_attribute *ncm_attrs[] = { 1566 &ncm_opts_attr_dev_addr, 1567 &ncm_opts_attr_host_addr, 1568 &ncm_opts_attr_qmult, 1569 &ncm_opts_attr_ifname, 1570 NULL, 1571 }; 1572 1573 static struct config_item_type ncm_func_type = { 1574 .ct_item_ops = &ncm_item_ops, 1575 .ct_attrs = ncm_attrs, 1576 .ct_owner = THIS_MODULE, 1577 }; 1578 1579 static void ncm_free_inst(struct usb_function_instance *f) 1580 { 1581 struct f_ncm_opts *opts; 1582 1583 opts = container_of(f, struct f_ncm_opts, func_inst); 1584 if (opts->bound) 1585 gether_cleanup(netdev_priv(opts->net)); 1586 else 1587 free_netdev(opts->net); 1588 kfree(opts); 1589 } 1590 1591 static struct usb_function_instance *ncm_alloc_inst(void) 1592 { 1593 struct f_ncm_opts *opts; 1594 1595 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1596 if (!opts) 1597 return ERR_PTR(-ENOMEM); 1598 mutex_init(&opts->lock); 1599 opts->func_inst.free_func_inst = ncm_free_inst; 1600 opts->net = gether_setup_default(); 1601 if (IS_ERR(opts->net)) { 1602 struct net_device *net = opts->net; 1603 kfree(opts); 1604 return ERR_CAST(net); 1605 } 1606 1607 config_group_init_type_name(&opts->func_inst.group, "", &ncm_func_type); 1608 1609 return &opts->func_inst; 1610 } 1611 1612 static void ncm_free(struct usb_function *f) 1613 { 1614 struct f_ncm *ncm; 1615 struct f_ncm_opts *opts; 1616 1617 ncm = func_to_ncm(f); 1618 opts = container_of(f->fi, struct f_ncm_opts, func_inst); 1619 kfree(ncm); 1620 mutex_lock(&opts->lock); 1621 opts->refcnt--; 1622 mutex_unlock(&opts->lock); 1623 } 1624 1625 static void ncm_unbind(struct usb_configuration *c, struct usb_function *f) 1626 { 1627 struct f_ncm *ncm = func_to_ncm(f); 1628 1629 DBG(c->cdev, "ncm unbind\n"); 1630 1631 hrtimer_cancel(&ncm->task_timer); 1632 tasklet_kill(&ncm->tx_tasklet); 1633 1634 ncm_string_defs[0].id = 0; 1635 usb_free_all_descriptors(f); 1636 1637 kfree(ncm->notify_req->buf); 1638 usb_ep_free_request(ncm->notify, ncm->notify_req); 1639 } 1640 1641 static struct usb_function *ncm_alloc(struct usb_function_instance *fi) 1642 { 1643 struct f_ncm *ncm; 1644 struct f_ncm_opts *opts; 1645 int status; 1646 1647 /* allocate and initialize one new instance */ 1648 ncm = kzalloc(sizeof(*ncm), GFP_KERNEL); 1649 if (!ncm) 1650 return ERR_PTR(-ENOMEM); 1651 1652 opts = container_of(fi, struct f_ncm_opts, func_inst); 1653 mutex_lock(&opts->lock); 1654 opts->refcnt++; 1655 1656 /* export host's Ethernet address in CDC format */ 1657 status = gether_get_host_addr_cdc(opts->net, ncm->ethaddr, 1658 sizeof(ncm->ethaddr)); 1659 if (status < 12) { /* strlen("01234567890a") */ 1660 kfree(ncm); 1661 mutex_unlock(&opts->lock); 1662 return ERR_PTR(-EINVAL); 1663 } 1664 ncm_string_defs[STRING_MAC_IDX].s = ncm->ethaddr; 1665 1666 spin_lock_init(&ncm->lock); 1667 ncm_reset_values(ncm); 1668 ncm->port.ioport = netdev_priv(opts->net); 1669 mutex_unlock(&opts->lock); 1670 ncm->port.is_fixed = true; 1671 ncm->port.supports_multi_frame = true; 1672 1673 ncm->port.func.name = "cdc_network"; 1674 /* descriptors are per-instance copies */ 1675 ncm->port.func.bind = ncm_bind; 1676 ncm->port.func.unbind = ncm_unbind; 1677 ncm->port.func.set_alt = ncm_set_alt; 1678 ncm->port.func.get_alt = ncm_get_alt; 1679 ncm->port.func.setup = ncm_setup; 1680 ncm->port.func.disable = ncm_disable; 1681 ncm->port.func.free_func = ncm_free; 1682 1683 ncm->port.wrap = ncm_wrap_ntb; 1684 ncm->port.unwrap = ncm_unwrap_ntb; 1685 1686 return &ncm->port.func; 1687 } 1688 1689 DECLARE_USB_FUNCTION_INIT(ncm, ncm_alloc_inst, ncm_alloc); 1690 MODULE_LICENSE("GPL"); 1691 MODULE_AUTHOR("Yauheni Kaliuta"); 1692