1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 4 */ 5 6 #include <linux/module.h> 7 #include "mt76.h" 8 #include "usb_trace.h" 9 #include "dma.h" 10 11 #define MT_VEND_REQ_MAX_RETRY 10 12 #define MT_VEND_REQ_TOUT_MS 300 13 14 static bool disable_usb_sg; 15 module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644); 16 MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support"); 17 18 static int __mt76u_vendor_request(struct mt76_dev *dev, u8 req, 19 u8 req_type, u16 val, u16 offset, 20 void *buf, size_t len) 21 { 22 struct usb_interface *uintf = to_usb_interface(dev->dev); 23 struct usb_device *udev = interface_to_usbdev(uintf); 24 unsigned int pipe; 25 int i, ret; 26 27 lockdep_assert_held(&dev->usb.usb_ctrl_mtx); 28 29 pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0) 30 : usb_sndctrlpipe(udev, 0); 31 for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) { 32 if (test_bit(MT76_REMOVED, &dev->phy.state)) 33 return -EIO; 34 35 ret = usb_control_msg(udev, pipe, req, req_type, val, 36 offset, buf, len, MT_VEND_REQ_TOUT_MS); 37 if (ret == -ENODEV) 38 set_bit(MT76_REMOVED, &dev->phy.state); 39 if (ret >= 0 || ret == -ENODEV) 40 return ret; 41 usleep_range(5000, 10000); 42 } 43 44 dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n", 45 req, offset, ret); 46 return ret; 47 } 48 49 int mt76u_vendor_request(struct mt76_dev *dev, u8 req, 50 u8 req_type, u16 val, u16 offset, 51 void *buf, size_t len) 52 { 53 int ret; 54 55 mutex_lock(&dev->usb.usb_ctrl_mtx); 56 ret = __mt76u_vendor_request(dev, req, req_type, 57 val, offset, buf, len); 58 trace_usb_reg_wr(dev, offset, val); 59 mutex_unlock(&dev->usb.usb_ctrl_mtx); 60 61 return ret; 62 } 63 EXPORT_SYMBOL_GPL(mt76u_vendor_request); 64 65 static u32 ___mt76u_rr(struct mt76_dev *dev, u8 req, u32 addr) 66 { 67 struct mt76_usb *usb = &dev->usb; 68 u32 data = ~0; 69 int ret; 70 71 ret = __mt76u_vendor_request(dev, req, 72 USB_DIR_IN | USB_TYPE_VENDOR, 73 addr >> 16, addr, usb->data, 74 sizeof(__le32)); 75 if (ret == sizeof(__le32)) 76 data = get_unaligned_le32(usb->data); 77 trace_usb_reg_rr(dev, addr, data); 78 79 return data; 80 } 81 82 static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr) 83 { 84 u8 req; 85 86 switch (addr & MT_VEND_TYPE_MASK) { 87 case MT_VEND_TYPE_EEPROM: 88 req = MT_VEND_READ_EEPROM; 89 break; 90 case MT_VEND_TYPE_CFG: 91 req = MT_VEND_READ_CFG; 92 break; 93 default: 94 req = MT_VEND_MULTI_READ; 95 break; 96 } 97 98 return ___mt76u_rr(dev, req, addr & ~MT_VEND_TYPE_MASK); 99 } 100 101 static u32 mt76u_rr(struct mt76_dev *dev, u32 addr) 102 { 103 u32 ret; 104 105 mutex_lock(&dev->usb.usb_ctrl_mtx); 106 ret = __mt76u_rr(dev, addr); 107 mutex_unlock(&dev->usb.usb_ctrl_mtx); 108 109 return ret; 110 } 111 112 static u32 mt76u_rr_ext(struct mt76_dev *dev, u32 addr) 113 { 114 u32 ret; 115 116 mutex_lock(&dev->usb.usb_ctrl_mtx); 117 ret = ___mt76u_rr(dev, MT_VEND_READ_EXT, addr); 118 mutex_unlock(&dev->usb.usb_ctrl_mtx); 119 120 return ret; 121 } 122 123 static void ___mt76u_wr(struct mt76_dev *dev, u8 req, 124 u32 addr, u32 val) 125 { 126 struct mt76_usb *usb = &dev->usb; 127 128 put_unaligned_le32(val, usb->data); 129 __mt76u_vendor_request(dev, req, 130 USB_DIR_OUT | USB_TYPE_VENDOR, 131 addr >> 16, addr, usb->data, 132 sizeof(__le32)); 133 trace_usb_reg_wr(dev, addr, val); 134 } 135 136 static void __mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) 137 { 138 u8 req; 139 140 switch (addr & MT_VEND_TYPE_MASK) { 141 case MT_VEND_TYPE_CFG: 142 req = MT_VEND_WRITE_CFG; 143 break; 144 default: 145 req = MT_VEND_MULTI_WRITE; 146 break; 147 } 148 ___mt76u_wr(dev, req, addr & ~MT_VEND_TYPE_MASK, val); 149 } 150 151 static void mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) 152 { 153 mutex_lock(&dev->usb.usb_ctrl_mtx); 154 __mt76u_wr(dev, addr, val); 155 mutex_unlock(&dev->usb.usb_ctrl_mtx); 156 } 157 158 static void mt76u_wr_ext(struct mt76_dev *dev, u32 addr, u32 val) 159 { 160 mutex_lock(&dev->usb.usb_ctrl_mtx); 161 ___mt76u_wr(dev, MT_VEND_WRITE_EXT, addr, val); 162 mutex_unlock(&dev->usb.usb_ctrl_mtx); 163 } 164 165 static u32 mt76u_rmw(struct mt76_dev *dev, u32 addr, 166 u32 mask, u32 val) 167 { 168 mutex_lock(&dev->usb.usb_ctrl_mtx); 169 val |= __mt76u_rr(dev, addr) & ~mask; 170 __mt76u_wr(dev, addr, val); 171 mutex_unlock(&dev->usb.usb_ctrl_mtx); 172 173 return val; 174 } 175 176 static u32 mt76u_rmw_ext(struct mt76_dev *dev, u32 addr, 177 u32 mask, u32 val) 178 { 179 mutex_lock(&dev->usb.usb_ctrl_mtx); 180 val |= ___mt76u_rr(dev, MT_VEND_READ_EXT, addr) & ~mask; 181 ___mt76u_wr(dev, MT_VEND_WRITE_EXT, addr, val); 182 mutex_unlock(&dev->usb.usb_ctrl_mtx); 183 184 return val; 185 } 186 187 static void mt76u_copy(struct mt76_dev *dev, u32 offset, 188 const void *data, int len) 189 { 190 struct mt76_usb *usb = &dev->usb; 191 const u8 *val = data; 192 int ret; 193 int current_batch_size; 194 int i = 0; 195 196 /* Assure that always a multiple of 4 bytes are copied, 197 * otherwise beacons can be corrupted. 198 * See: "mt76: round up length on mt76_wr_copy" 199 * Commit 850e8f6fbd5d0003b0 200 */ 201 len = round_up(len, 4); 202 203 mutex_lock(&usb->usb_ctrl_mtx); 204 while (i < len) { 205 current_batch_size = min_t(int, usb->data_len, len - i); 206 memcpy(usb->data, val + i, current_batch_size); 207 ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE, 208 USB_DIR_OUT | USB_TYPE_VENDOR, 209 0, offset + i, usb->data, 210 current_batch_size); 211 if (ret < 0) 212 break; 213 214 i += current_batch_size; 215 } 216 mutex_unlock(&usb->usb_ctrl_mtx); 217 } 218 219 static void mt76u_copy_ext(struct mt76_dev *dev, u32 offset, 220 const void *data, int len) 221 { 222 struct mt76_usb *usb = &dev->usb; 223 int ret, i = 0, batch_len; 224 const u8 *val = data; 225 226 len = round_up(len, 4); 227 mutex_lock(&usb->usb_ctrl_mtx); 228 while (i < len) { 229 batch_len = min_t(int, usb->data_len, len - i); 230 memcpy(usb->data, val + i, batch_len); 231 ret = __mt76u_vendor_request(dev, MT_VEND_WRITE_EXT, 232 USB_DIR_OUT | USB_TYPE_VENDOR, 233 (offset + i) >> 16, offset + i, 234 usb->data, batch_len); 235 if (ret < 0) 236 break; 237 238 i += batch_len; 239 } 240 mutex_unlock(&usb->usb_ctrl_mtx); 241 } 242 243 static void 244 mt76u_read_copy_ext(struct mt76_dev *dev, u32 offset, 245 void *data, int len) 246 { 247 struct mt76_usb *usb = &dev->usb; 248 int i = 0, batch_len, ret; 249 u8 *val = data; 250 251 len = round_up(len, 4); 252 mutex_lock(&usb->usb_ctrl_mtx); 253 while (i < len) { 254 batch_len = min_t(int, usb->data_len, len - i); 255 ret = __mt76u_vendor_request(dev, MT_VEND_READ_EXT, 256 USB_DIR_IN | USB_TYPE_VENDOR, 257 (offset + i) >> 16, offset + i, 258 usb->data, batch_len); 259 if (ret < 0) 260 break; 261 262 memcpy(val + i, usb->data, batch_len); 263 i += batch_len; 264 } 265 mutex_unlock(&usb->usb_ctrl_mtx); 266 } 267 268 void mt76u_single_wr(struct mt76_dev *dev, const u8 req, 269 const u16 offset, const u32 val) 270 { 271 mutex_lock(&dev->usb.usb_ctrl_mtx); 272 __mt76u_vendor_request(dev, req, 273 USB_DIR_OUT | USB_TYPE_VENDOR, 274 val & 0xffff, offset, NULL, 0); 275 __mt76u_vendor_request(dev, req, 276 USB_DIR_OUT | USB_TYPE_VENDOR, 277 val >> 16, offset + 2, NULL, 0); 278 mutex_unlock(&dev->usb.usb_ctrl_mtx); 279 } 280 EXPORT_SYMBOL_GPL(mt76u_single_wr); 281 282 static int 283 mt76u_req_wr_rp(struct mt76_dev *dev, u32 base, 284 const struct mt76_reg_pair *data, int len) 285 { 286 struct mt76_usb *usb = &dev->usb; 287 288 mutex_lock(&usb->usb_ctrl_mtx); 289 while (len > 0) { 290 __mt76u_wr(dev, base + data->reg, data->value); 291 len--; 292 data++; 293 } 294 mutex_unlock(&usb->usb_ctrl_mtx); 295 296 return 0; 297 } 298 299 static int 300 mt76u_wr_rp(struct mt76_dev *dev, u32 base, 301 const struct mt76_reg_pair *data, int n) 302 { 303 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) 304 return dev->mcu_ops->mcu_wr_rp(dev, base, data, n); 305 else 306 return mt76u_req_wr_rp(dev, base, data, n); 307 } 308 309 static int 310 mt76u_req_rd_rp(struct mt76_dev *dev, u32 base, struct mt76_reg_pair *data, 311 int len) 312 { 313 struct mt76_usb *usb = &dev->usb; 314 315 mutex_lock(&usb->usb_ctrl_mtx); 316 while (len > 0) { 317 data->value = __mt76u_rr(dev, base + data->reg); 318 len--; 319 data++; 320 } 321 mutex_unlock(&usb->usb_ctrl_mtx); 322 323 return 0; 324 } 325 326 static int 327 mt76u_rd_rp(struct mt76_dev *dev, u32 base, 328 struct mt76_reg_pair *data, int n) 329 { 330 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) 331 return dev->mcu_ops->mcu_rd_rp(dev, base, data, n); 332 else 333 return mt76u_req_rd_rp(dev, base, data, n); 334 } 335 336 static bool mt76u_check_sg(struct mt76_dev *dev) 337 { 338 struct usb_interface *uintf = to_usb_interface(dev->dev); 339 struct usb_device *udev = interface_to_usbdev(uintf); 340 341 return (!disable_usb_sg && udev->bus->sg_tablesize > 0 && 342 (udev->bus->no_sg_constraint || 343 udev->speed == USB_SPEED_WIRELESS)); 344 } 345 346 static int 347 mt76u_set_endpoints(struct usb_interface *intf, 348 struct mt76_usb *usb) 349 { 350 struct usb_host_interface *intf_desc = intf->cur_altsetting; 351 struct usb_endpoint_descriptor *ep_desc; 352 int i, in_ep = 0, out_ep = 0; 353 354 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 355 ep_desc = &intf_desc->endpoint[i].desc; 356 357 if (usb_endpoint_is_bulk_in(ep_desc) && 358 in_ep < __MT_EP_IN_MAX) { 359 usb->in_ep[in_ep] = usb_endpoint_num(ep_desc); 360 in_ep++; 361 } else if (usb_endpoint_is_bulk_out(ep_desc) && 362 out_ep < __MT_EP_OUT_MAX) { 363 usb->out_ep[out_ep] = usb_endpoint_num(ep_desc); 364 out_ep++; 365 } 366 } 367 368 if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX) 369 return -EINVAL; 370 return 0; 371 } 372 373 static int 374 mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76_queue *q, struct urb *urb, 375 int nsgs, gfp_t gfp) 376 { 377 int i; 378 379 for (i = 0; i < nsgs; i++) { 380 struct page *page; 381 void *data; 382 int offset; 383 384 data = page_frag_alloc(&q->rx_page, q->buf_size, gfp); 385 if (!data) 386 break; 387 388 page = virt_to_head_page(data); 389 offset = data - page_address(page); 390 sg_set_page(&urb->sg[i], page, q->buf_size, offset); 391 } 392 393 if (i < nsgs) { 394 int j; 395 396 for (j = nsgs; j < urb->num_sgs; j++) 397 skb_free_frag(sg_virt(&urb->sg[j])); 398 urb->num_sgs = i; 399 } 400 401 urb->num_sgs = max_t(int, i, urb->num_sgs); 402 urb->transfer_buffer_length = urb->num_sgs * q->buf_size; 403 sg_init_marker(urb->sg, urb->num_sgs); 404 405 return i ? : -ENOMEM; 406 } 407 408 static int 409 mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q, 410 struct urb *urb, int nsgs, gfp_t gfp) 411 { 412 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN]; 413 414 if (qid == MT_RXQ_MAIN && dev->usb.sg_en) 415 return mt76u_fill_rx_sg(dev, q, urb, nsgs, gfp); 416 417 urb->transfer_buffer_length = q->buf_size; 418 urb->transfer_buffer = page_frag_alloc(&q->rx_page, q->buf_size, gfp); 419 420 return urb->transfer_buffer ? 0 : -ENOMEM; 421 } 422 423 static int 424 mt76u_urb_alloc(struct mt76_dev *dev, struct mt76_queue_entry *e, 425 int sg_max_size) 426 { 427 unsigned int size = sizeof(struct urb); 428 429 if (dev->usb.sg_en) 430 size += sg_max_size * sizeof(struct scatterlist); 431 432 e->urb = kzalloc(size, GFP_KERNEL); 433 if (!e->urb) 434 return -ENOMEM; 435 436 usb_init_urb(e->urb); 437 438 if (dev->usb.sg_en && sg_max_size > 0) 439 e->urb->sg = (struct scatterlist *)(e->urb + 1); 440 441 return 0; 442 } 443 444 static int 445 mt76u_rx_urb_alloc(struct mt76_dev *dev, struct mt76_queue *q, 446 struct mt76_queue_entry *e) 447 { 448 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN]; 449 int err, sg_size; 450 451 sg_size = qid == MT_RXQ_MAIN ? MT_RX_SG_MAX_SIZE : 0; 452 err = mt76u_urb_alloc(dev, e, sg_size); 453 if (err) 454 return err; 455 456 return mt76u_refill_rx(dev, q, e->urb, sg_size, GFP_KERNEL); 457 } 458 459 static void mt76u_urb_free(struct urb *urb) 460 { 461 int i; 462 463 for (i = 0; i < urb->num_sgs; i++) 464 skb_free_frag(sg_virt(&urb->sg[i])); 465 466 if (urb->transfer_buffer) 467 skb_free_frag(urb->transfer_buffer); 468 469 usb_free_urb(urb); 470 } 471 472 static void 473 mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index, 474 struct urb *urb, usb_complete_t complete_fn, 475 void *context) 476 { 477 struct usb_interface *uintf = to_usb_interface(dev->dev); 478 struct usb_device *udev = interface_to_usbdev(uintf); 479 unsigned int pipe; 480 481 if (dir == USB_DIR_IN) 482 pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]); 483 else 484 pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]); 485 486 urb->dev = udev; 487 urb->pipe = pipe; 488 urb->complete = complete_fn; 489 urb->context = context; 490 } 491 492 static struct urb * 493 mt76u_get_next_rx_entry(struct mt76_queue *q) 494 { 495 struct urb *urb = NULL; 496 unsigned long flags; 497 498 spin_lock_irqsave(&q->lock, flags); 499 if (q->queued > 0) { 500 urb = q->entry[q->head].urb; 501 q->head = (q->head + 1) % q->ndesc; 502 q->queued--; 503 } 504 spin_unlock_irqrestore(&q->lock, flags); 505 506 return urb; 507 } 508 509 static int 510 mt76u_get_rx_entry_len(struct mt76_dev *dev, u8 *data, 511 u32 data_len) 512 { 513 u16 dma_len, min_len; 514 515 dma_len = get_unaligned_le16(data); 516 if (dev->drv->drv_flags & MT_DRV_RX_DMA_HDR) 517 return dma_len; 518 519 min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + MT_FCE_INFO_LEN; 520 if (data_len < min_len || !dma_len || 521 dma_len + MT_DMA_HDR_LEN > data_len || 522 (dma_len & 0x3)) 523 return -EINVAL; 524 return dma_len; 525 } 526 527 static struct sk_buff * 528 mt76u_build_rx_skb(struct mt76_dev *dev, void *data, 529 int len, int buf_size) 530 { 531 int head_room, drv_flags = dev->drv->drv_flags; 532 struct sk_buff *skb; 533 534 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN; 535 if (SKB_WITH_OVERHEAD(buf_size) < head_room + len) { 536 struct page *page; 537 538 /* slow path, not enough space for data and 539 * skb_shared_info 540 */ 541 skb = alloc_skb(MT_SKB_HEAD_LEN, GFP_ATOMIC); 542 if (!skb) 543 return NULL; 544 545 skb_put_data(skb, data + head_room, MT_SKB_HEAD_LEN); 546 data += head_room + MT_SKB_HEAD_LEN; 547 page = virt_to_head_page(data); 548 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 549 page, data - page_address(page), 550 len - MT_SKB_HEAD_LEN, buf_size); 551 552 return skb; 553 } 554 555 /* fast path */ 556 skb = build_skb(data, buf_size); 557 if (!skb) 558 return NULL; 559 560 skb_reserve(skb, head_room); 561 __skb_put(skb, len); 562 563 return skb; 564 } 565 566 static int 567 mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb, 568 int buf_size) 569 { 570 u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : urb->transfer_buffer; 571 int data_len = urb->num_sgs ? urb->sg[0].length : urb->actual_length; 572 int len, nsgs = 1, head_room, drv_flags = dev->drv->drv_flags; 573 struct sk_buff *skb; 574 575 if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state)) 576 return 0; 577 578 len = mt76u_get_rx_entry_len(dev, data, urb->actual_length); 579 if (len < 0) 580 return 0; 581 582 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN; 583 data_len = min_t(int, len, data_len - head_room); 584 skb = mt76u_build_rx_skb(dev, data, data_len, buf_size); 585 if (!skb) 586 return 0; 587 588 len -= data_len; 589 while (len > 0 && nsgs < urb->num_sgs) { 590 data_len = min_t(int, len, urb->sg[nsgs].length); 591 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 592 sg_page(&urb->sg[nsgs]), 593 urb->sg[nsgs].offset, data_len, 594 buf_size); 595 len -= data_len; 596 nsgs++; 597 } 598 dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb); 599 600 return nsgs; 601 } 602 603 static void mt76u_complete_rx(struct urb *urb) 604 { 605 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev); 606 struct mt76_queue *q = urb->context; 607 unsigned long flags; 608 609 trace_rx_urb(dev, urb); 610 611 switch (urb->status) { 612 case -ECONNRESET: 613 case -ESHUTDOWN: 614 case -ENOENT: 615 return; 616 default: 617 dev_err_ratelimited(dev->dev, "rx urb failed: %d\n", 618 urb->status); 619 /* fall through */ 620 case 0: 621 break; 622 } 623 624 spin_lock_irqsave(&q->lock, flags); 625 if (WARN_ONCE(q->entry[q->tail].urb != urb, "rx urb mismatch")) 626 goto out; 627 628 q->tail = (q->tail + 1) % q->ndesc; 629 q->queued++; 630 tasklet_schedule(&dev->usb.rx_tasklet); 631 out: 632 spin_unlock_irqrestore(&q->lock, flags); 633 } 634 635 static int 636 mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid, 637 struct urb *urb) 638 { 639 int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP; 640 641 mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb, 642 mt76u_complete_rx, &dev->q_rx[qid]); 643 trace_submit_urb(dev, urb); 644 645 return usb_submit_urb(urb, GFP_ATOMIC); 646 } 647 648 static void 649 mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 650 { 651 int qid = q - &dev->q_rx[MT_RXQ_MAIN]; 652 struct urb *urb; 653 int err, count; 654 655 while (true) { 656 urb = mt76u_get_next_rx_entry(q); 657 if (!urb) 658 break; 659 660 count = mt76u_process_rx_entry(dev, urb, q->buf_size); 661 if (count > 0) { 662 err = mt76u_refill_rx(dev, q, urb, count, GFP_ATOMIC); 663 if (err < 0) 664 break; 665 } 666 mt76u_submit_rx_buf(dev, qid, urb); 667 } 668 if (qid == MT_RXQ_MAIN) 669 mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL); 670 } 671 672 static void mt76u_rx_tasklet(unsigned long data) 673 { 674 struct mt76_dev *dev = (struct mt76_dev *)data; 675 int i; 676 677 rcu_read_lock(); 678 mt76_for_each_q_rx(dev, i) 679 mt76u_process_rx_queue(dev, &dev->q_rx[i]); 680 rcu_read_unlock(); 681 } 682 683 static int 684 mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid) 685 { 686 struct mt76_queue *q = &dev->q_rx[qid]; 687 unsigned long flags; 688 int i, err = 0; 689 690 spin_lock_irqsave(&q->lock, flags); 691 for (i = 0; i < q->ndesc; i++) { 692 err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb); 693 if (err < 0) 694 break; 695 } 696 q->head = q->tail = 0; 697 q->queued = 0; 698 spin_unlock_irqrestore(&q->lock, flags); 699 700 return err; 701 } 702 703 static int 704 mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid) 705 { 706 struct mt76_queue *q = &dev->q_rx[qid]; 707 int i, err; 708 709 spin_lock_init(&q->lock); 710 q->entry = devm_kcalloc(dev->dev, 711 MT_NUM_RX_ENTRIES, sizeof(*q->entry), 712 GFP_KERNEL); 713 if (!q->entry) 714 return -ENOMEM; 715 716 q->ndesc = MT_NUM_RX_ENTRIES; 717 q->buf_size = PAGE_SIZE; 718 719 for (i = 0; i < q->ndesc; i++) { 720 err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]); 721 if (err < 0) 722 return err; 723 } 724 725 return mt76u_submit_rx_buffers(dev, qid); 726 } 727 728 int mt76u_alloc_mcu_queue(struct mt76_dev *dev) 729 { 730 return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU); 731 } 732 EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue); 733 734 static void 735 mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 736 { 737 struct page *page; 738 int i; 739 740 for (i = 0; i < q->ndesc; i++) 741 mt76u_urb_free(q->entry[i].urb); 742 743 if (!q->rx_page.va) 744 return; 745 746 page = virt_to_page(q->rx_page.va); 747 __page_frag_cache_drain(page, q->rx_page.pagecnt_bias); 748 memset(&q->rx_page, 0, sizeof(q->rx_page)); 749 } 750 751 static void mt76u_free_rx(struct mt76_dev *dev) 752 { 753 int i; 754 755 mt76_for_each_q_rx(dev, i) 756 mt76u_free_rx_queue(dev, &dev->q_rx[i]); 757 } 758 759 void mt76u_stop_rx(struct mt76_dev *dev) 760 { 761 int i; 762 763 mt76_for_each_q_rx(dev, i) { 764 struct mt76_queue *q = &dev->q_rx[i]; 765 int j; 766 767 for (j = 0; j < q->ndesc; j++) 768 usb_poison_urb(q->entry[j].urb); 769 } 770 771 tasklet_kill(&dev->usb.rx_tasklet); 772 } 773 EXPORT_SYMBOL_GPL(mt76u_stop_rx); 774 775 int mt76u_resume_rx(struct mt76_dev *dev) 776 { 777 int i; 778 779 mt76_for_each_q_rx(dev, i) { 780 struct mt76_queue *q = &dev->q_rx[i]; 781 int err, j; 782 783 for (j = 0; j < q->ndesc; j++) 784 usb_unpoison_urb(q->entry[j].urb); 785 786 err = mt76u_submit_rx_buffers(dev, i); 787 if (err < 0) 788 return err; 789 } 790 791 return 0; 792 } 793 EXPORT_SYMBOL_GPL(mt76u_resume_rx); 794 795 static void mt76u_tx_tasklet(unsigned long data) 796 { 797 struct mt76_dev *dev = (struct mt76_dev *)data; 798 struct mt76_queue_entry entry; 799 struct mt76_sw_queue *sq; 800 struct mt76_queue *q; 801 bool wake; 802 int i; 803 804 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 805 u32 n_dequeued = 0, n_sw_dequeued = 0; 806 807 sq = &dev->q_tx[i]; 808 q = sq->q; 809 810 while (q->queued > n_dequeued) { 811 if (!q->entry[q->head].done) 812 break; 813 814 if (q->entry[q->head].schedule) { 815 q->entry[q->head].schedule = false; 816 n_sw_dequeued++; 817 } 818 819 entry = q->entry[q->head]; 820 q->entry[q->head].done = false; 821 q->head = (q->head + 1) % q->ndesc; 822 n_dequeued++; 823 824 dev->drv->tx_complete_skb(dev, i, &entry); 825 } 826 827 spin_lock_bh(&q->lock); 828 829 sq->swq_queued -= n_sw_dequeued; 830 q->queued -= n_dequeued; 831 832 wake = q->stopped && q->queued < q->ndesc - 8; 833 if (wake) 834 q->stopped = false; 835 836 if (!q->queued) 837 wake_up(&dev->tx_wait); 838 839 spin_unlock_bh(&q->lock); 840 841 mt76_txq_schedule(&dev->phy, i); 842 843 if (dev->drv->tx_status_data && 844 !test_and_set_bit(MT76_READING_STATS, &dev->phy.state)) 845 queue_work(dev->wq, &dev->usb.stat_work); 846 if (wake) 847 ieee80211_wake_queue(dev->hw, i); 848 } 849 } 850 851 static void mt76u_tx_status_data(struct work_struct *work) 852 { 853 struct mt76_usb *usb; 854 struct mt76_dev *dev; 855 u8 update = 1; 856 u16 count = 0; 857 858 usb = container_of(work, struct mt76_usb, stat_work); 859 dev = container_of(usb, struct mt76_dev, usb); 860 861 while (true) { 862 if (test_bit(MT76_REMOVED, &dev->phy.state)) 863 break; 864 865 if (!dev->drv->tx_status_data(dev, &update)) 866 break; 867 count++; 868 } 869 870 if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state)) 871 queue_work(dev->wq, &usb->stat_work); 872 else 873 clear_bit(MT76_READING_STATS, &dev->phy.state); 874 } 875 876 static void mt76u_complete_tx(struct urb *urb) 877 { 878 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev); 879 struct mt76_queue_entry *e = urb->context; 880 881 if (mt76u_urb_error(urb)) 882 dev_err(dev->dev, "tx urb failed: %d\n", urb->status); 883 e->done = true; 884 885 tasklet_schedule(&dev->tx_tasklet); 886 } 887 888 static int 889 mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb, 890 struct urb *urb) 891 { 892 urb->transfer_buffer_length = skb->len; 893 894 if (!dev->usb.sg_en) { 895 urb->transfer_buffer = skb->data; 896 return 0; 897 } 898 899 sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE); 900 urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len); 901 if (!urb->num_sgs) 902 return -ENOMEM; 903 904 return urb->num_sgs; 905 } 906 907 static int 908 mt76u_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid, 909 struct sk_buff *skb, struct mt76_wcid *wcid, 910 struct ieee80211_sta *sta) 911 { 912 struct mt76_queue *q = dev->q_tx[qid].q; 913 struct mt76_tx_info tx_info = { 914 .skb = skb, 915 }; 916 u16 idx = q->tail; 917 int err; 918 919 if (q->queued == q->ndesc) 920 return -ENOSPC; 921 922 skb->prev = skb->next = NULL; 923 err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info); 924 if (err < 0) 925 return err; 926 927 err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb); 928 if (err < 0) 929 return err; 930 931 mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx), 932 q->entry[idx].urb, mt76u_complete_tx, 933 &q->entry[idx]); 934 935 q->tail = (q->tail + 1) % q->ndesc; 936 q->entry[idx].skb = tx_info.skb; 937 q->queued++; 938 939 return idx; 940 } 941 942 static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q) 943 { 944 struct urb *urb; 945 int err; 946 947 while (q->first != q->tail) { 948 urb = q->entry[q->first].urb; 949 950 trace_submit_urb(dev, urb); 951 err = usb_submit_urb(urb, GFP_ATOMIC); 952 if (err < 0) { 953 if (err == -ENODEV) 954 set_bit(MT76_REMOVED, &dev->phy.state); 955 else 956 dev_err(dev->dev, "tx urb submit failed:%d\n", 957 err); 958 break; 959 } 960 q->first = (q->first + 1) % q->ndesc; 961 } 962 } 963 964 static u8 mt76u_ac_to_hwq(struct mt76_dev *dev, u8 ac) 965 { 966 if (mt76_chip(dev) == 0x7663) { 967 static const u8 lmac_queue_map[] = { 968 /* ac to lmac mapping */ 969 [IEEE80211_AC_BK] = 0, 970 [IEEE80211_AC_BE] = 1, 971 [IEEE80211_AC_VI] = 2, 972 [IEEE80211_AC_VO] = 4, 973 }; 974 975 if (WARN_ON(ac >= ARRAY_SIZE(lmac_queue_map))) 976 return 1; /* BE */ 977 978 return lmac_queue_map[ac]; 979 } 980 981 return mt76_ac_to_hwq(ac); 982 } 983 984 static int mt76u_alloc_tx(struct mt76_dev *dev) 985 { 986 struct mt76_queue *q; 987 int i, j, err; 988 989 for (i = 0; i <= MT_TXQ_PSD; i++) { 990 INIT_LIST_HEAD(&dev->q_tx[i].swq); 991 992 if (i >= IEEE80211_NUM_ACS) { 993 dev->q_tx[i].q = dev->q_tx[0].q; 994 continue; 995 } 996 997 q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL); 998 if (!q) 999 return -ENOMEM; 1000 1001 spin_lock_init(&q->lock); 1002 q->hw_idx = mt76u_ac_to_hwq(dev, i); 1003 dev->q_tx[i].q = q; 1004 1005 q->entry = devm_kcalloc(dev->dev, 1006 MT_NUM_TX_ENTRIES, sizeof(*q->entry), 1007 GFP_KERNEL); 1008 if (!q->entry) 1009 return -ENOMEM; 1010 1011 q->ndesc = MT_NUM_TX_ENTRIES; 1012 for (j = 0; j < q->ndesc; j++) { 1013 err = mt76u_urb_alloc(dev, &q->entry[j], 1014 MT_TX_SG_MAX_SIZE); 1015 if (err < 0) 1016 return err; 1017 } 1018 } 1019 return 0; 1020 } 1021 1022 static void mt76u_free_tx(struct mt76_dev *dev) 1023 { 1024 int i; 1025 1026 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1027 struct mt76_queue *q; 1028 int j; 1029 1030 q = dev->q_tx[i].q; 1031 if (!q) 1032 continue; 1033 1034 for (j = 0; j < q->ndesc; j++) 1035 usb_free_urb(q->entry[j].urb); 1036 } 1037 } 1038 1039 void mt76u_stop_tx(struct mt76_dev *dev) 1040 { 1041 int ret; 1042 1043 ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy), 1044 HZ / 5); 1045 if (!ret) { 1046 struct mt76_queue_entry entry; 1047 struct mt76_queue *q; 1048 int i, j; 1049 1050 dev_err(dev->dev, "timed out waiting for pending tx\n"); 1051 1052 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1053 q = dev->q_tx[i].q; 1054 if (!q) 1055 continue; 1056 1057 for (j = 0; j < q->ndesc; j++) 1058 usb_kill_urb(q->entry[j].urb); 1059 } 1060 1061 tasklet_kill(&dev->tx_tasklet); 1062 1063 /* On device removal we maight queue skb's, but mt76u_tx_kick() 1064 * will fail to submit urb, cleanup those skb's manually. 1065 */ 1066 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1067 q = dev->q_tx[i].q; 1068 if (!q) 1069 continue; 1070 1071 /* Assure we are in sync with killed tasklet. */ 1072 spin_lock_bh(&q->lock); 1073 while (q->queued) { 1074 entry = q->entry[q->head]; 1075 q->head = (q->head + 1) % q->ndesc; 1076 q->queued--; 1077 1078 dev->drv->tx_complete_skb(dev, i, &entry); 1079 } 1080 spin_unlock_bh(&q->lock); 1081 } 1082 } 1083 1084 cancel_work_sync(&dev->usb.stat_work); 1085 clear_bit(MT76_READING_STATS, &dev->phy.state); 1086 1087 mt76_tx_status_check(dev, NULL, true); 1088 } 1089 EXPORT_SYMBOL_GPL(mt76u_stop_tx); 1090 1091 void mt76u_queues_deinit(struct mt76_dev *dev) 1092 { 1093 mt76u_stop_rx(dev); 1094 mt76u_stop_tx(dev); 1095 1096 mt76u_free_rx(dev); 1097 mt76u_free_tx(dev); 1098 } 1099 EXPORT_SYMBOL_GPL(mt76u_queues_deinit); 1100 1101 int mt76u_alloc_queues(struct mt76_dev *dev) 1102 { 1103 int err; 1104 1105 err = mt76u_alloc_rx_queue(dev, MT_RXQ_MAIN); 1106 if (err < 0) 1107 return err; 1108 1109 return mt76u_alloc_tx(dev); 1110 } 1111 EXPORT_SYMBOL_GPL(mt76u_alloc_queues); 1112 1113 static const struct mt76_queue_ops usb_queue_ops = { 1114 .tx_queue_skb = mt76u_tx_queue_skb, 1115 .kick = mt76u_tx_kick, 1116 }; 1117 1118 int mt76u_init(struct mt76_dev *dev, 1119 struct usb_interface *intf, bool ext) 1120 { 1121 static struct mt76_bus_ops mt76u_ops = { 1122 .read_copy = mt76u_read_copy_ext, 1123 .wr_rp = mt76u_wr_rp, 1124 .rd_rp = mt76u_rd_rp, 1125 .type = MT76_BUS_USB, 1126 }; 1127 struct usb_device *udev = interface_to_usbdev(intf); 1128 struct mt76_usb *usb = &dev->usb; 1129 int err = -ENOMEM; 1130 1131 mt76u_ops.rr = ext ? mt76u_rr_ext : mt76u_rr; 1132 mt76u_ops.wr = ext ? mt76u_wr_ext : mt76u_wr; 1133 mt76u_ops.rmw = ext ? mt76u_rmw_ext : mt76u_rmw; 1134 mt76u_ops.write_copy = ext ? mt76u_copy_ext : mt76u_copy; 1135 1136 tasklet_init(&usb->rx_tasklet, mt76u_rx_tasklet, (unsigned long)dev); 1137 tasklet_init(&dev->tx_tasklet, mt76u_tx_tasklet, (unsigned long)dev); 1138 INIT_WORK(&usb->stat_work, mt76u_tx_status_data); 1139 1140 usb->data_len = usb_maxpacket(udev, usb_sndctrlpipe(udev, 0), 1); 1141 if (usb->data_len < 32) 1142 usb->data_len = 32; 1143 1144 usb->data = devm_kmalloc(dev->dev, usb->data_len, GFP_KERNEL); 1145 if (!usb->data) 1146 goto error; 1147 1148 mutex_init(&usb->usb_ctrl_mtx); 1149 dev->bus = &mt76u_ops; 1150 dev->queue_ops = &usb_queue_ops; 1151 1152 dev_set_drvdata(&udev->dev, dev); 1153 1154 usb->sg_en = mt76u_check_sg(dev); 1155 1156 err = mt76u_set_endpoints(intf, usb); 1157 if (err < 0) 1158 goto error; 1159 1160 return 0; 1161 1162 error: 1163 destroy_workqueue(dev->wq); 1164 1165 return err; 1166 } 1167 EXPORT_SYMBOL_GPL(mt76u_init); 1168 1169 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>"); 1170 MODULE_LICENSE("Dual BSD/GPL"); 1171