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->tail].urb; 501 q->tail = (q->tail + 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 case -EPROTO: 616 return; 617 default: 618 dev_err_ratelimited(dev->dev, "rx urb failed: %d\n", 619 urb->status); 620 fallthrough; 621 case 0: 622 break; 623 } 624 625 spin_lock_irqsave(&q->lock, flags); 626 if (WARN_ONCE(q->entry[q->head].urb != urb, "rx urb mismatch")) 627 goto out; 628 629 q->head = (q->head + 1) % q->ndesc; 630 q->queued++; 631 mt76_worker_schedule(&dev->usb.rx_worker); 632 out: 633 spin_unlock_irqrestore(&q->lock, flags); 634 } 635 636 static int 637 mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid, 638 struct urb *urb) 639 { 640 int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP; 641 642 mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb, 643 mt76u_complete_rx, &dev->q_rx[qid]); 644 trace_submit_urb(dev, urb); 645 646 return usb_submit_urb(urb, GFP_ATOMIC); 647 } 648 649 static void 650 mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 651 { 652 int qid = q - &dev->q_rx[MT_RXQ_MAIN]; 653 struct urb *urb; 654 int err, count; 655 656 while (true) { 657 urb = mt76u_get_next_rx_entry(q); 658 if (!urb) 659 break; 660 661 count = mt76u_process_rx_entry(dev, urb, q->buf_size); 662 if (count > 0) { 663 err = mt76u_refill_rx(dev, q, urb, count, GFP_ATOMIC); 664 if (err < 0) 665 break; 666 } 667 mt76u_submit_rx_buf(dev, qid, urb); 668 } 669 if (qid == MT_RXQ_MAIN) { 670 local_bh_disable(); 671 mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL); 672 local_bh_enable(); 673 } 674 } 675 676 static void mt76u_rx_worker(struct mt76_worker *w) 677 { 678 struct mt76_usb *usb = container_of(w, struct mt76_usb, rx_worker); 679 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb); 680 int i; 681 682 rcu_read_lock(); 683 mt76_for_each_q_rx(dev, i) 684 mt76u_process_rx_queue(dev, &dev->q_rx[i]); 685 rcu_read_unlock(); 686 } 687 688 static int 689 mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid) 690 { 691 struct mt76_queue *q = &dev->q_rx[qid]; 692 unsigned long flags; 693 int i, err = 0; 694 695 spin_lock_irqsave(&q->lock, flags); 696 for (i = 0; i < q->ndesc; i++) { 697 err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb); 698 if (err < 0) 699 break; 700 } 701 q->head = q->tail = 0; 702 q->queued = 0; 703 spin_unlock_irqrestore(&q->lock, flags); 704 705 return err; 706 } 707 708 static int 709 mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid) 710 { 711 struct mt76_queue *q = &dev->q_rx[qid]; 712 int i, err; 713 714 spin_lock_init(&q->lock); 715 q->entry = devm_kcalloc(dev->dev, 716 MT_NUM_RX_ENTRIES, sizeof(*q->entry), 717 GFP_KERNEL); 718 if (!q->entry) 719 return -ENOMEM; 720 721 q->ndesc = MT_NUM_RX_ENTRIES; 722 q->buf_size = PAGE_SIZE; 723 724 for (i = 0; i < q->ndesc; i++) { 725 err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]); 726 if (err < 0) 727 return err; 728 } 729 730 return mt76u_submit_rx_buffers(dev, qid); 731 } 732 733 int mt76u_alloc_mcu_queue(struct mt76_dev *dev) 734 { 735 return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU); 736 } 737 EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue); 738 739 static void 740 mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 741 { 742 struct page *page; 743 int i; 744 745 for (i = 0; i < q->ndesc; i++) { 746 if (!q->entry[i].urb) 747 continue; 748 749 mt76u_urb_free(q->entry[i].urb); 750 q->entry[i].urb = NULL; 751 } 752 753 if (!q->rx_page.va) 754 return; 755 756 page = virt_to_page(q->rx_page.va); 757 __page_frag_cache_drain(page, q->rx_page.pagecnt_bias); 758 memset(&q->rx_page, 0, sizeof(q->rx_page)); 759 } 760 761 static void mt76u_free_rx(struct mt76_dev *dev) 762 { 763 int i; 764 765 mt76_worker_teardown(&dev->usb.rx_worker); 766 767 mt76_for_each_q_rx(dev, i) 768 mt76u_free_rx_queue(dev, &dev->q_rx[i]); 769 } 770 771 void mt76u_stop_rx(struct mt76_dev *dev) 772 { 773 int i; 774 775 mt76_worker_disable(&dev->usb.rx_worker); 776 777 mt76_for_each_q_rx(dev, i) { 778 struct mt76_queue *q = &dev->q_rx[i]; 779 int j; 780 781 for (j = 0; j < q->ndesc; j++) 782 usb_poison_urb(q->entry[j].urb); 783 } 784 } 785 EXPORT_SYMBOL_GPL(mt76u_stop_rx); 786 787 int mt76u_resume_rx(struct mt76_dev *dev) 788 { 789 int i; 790 791 mt76_for_each_q_rx(dev, i) { 792 struct mt76_queue *q = &dev->q_rx[i]; 793 int err, j; 794 795 for (j = 0; j < q->ndesc; j++) 796 usb_unpoison_urb(q->entry[j].urb); 797 798 err = mt76u_submit_rx_buffers(dev, i); 799 if (err < 0) 800 return err; 801 } 802 803 mt76_worker_enable(&dev->usb.rx_worker); 804 805 return 0; 806 } 807 EXPORT_SYMBOL_GPL(mt76u_resume_rx); 808 809 static void mt76u_status_worker(struct mt76_worker *w) 810 { 811 struct mt76_usb *usb = container_of(w, struct mt76_usb, status_worker); 812 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb); 813 struct mt76_queue_entry entry; 814 struct mt76_queue *q; 815 int i; 816 817 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 818 q = dev->phy.q_tx[i]; 819 if (!q) 820 continue; 821 822 while (q->queued > 0) { 823 if (!q->entry[q->tail].done) 824 break; 825 826 entry = q->entry[q->tail]; 827 q->entry[q->tail].done = false; 828 829 mt76_queue_tx_complete(dev, q, &entry); 830 } 831 832 if (!q->queued) 833 wake_up(&dev->tx_wait); 834 835 mt76_worker_schedule(&dev->tx_worker); 836 837 if (dev->drv->tx_status_data && 838 !test_and_set_bit(MT76_READING_STATS, &dev->phy.state)) 839 queue_work(dev->wq, &dev->usb.stat_work); 840 } 841 } 842 843 static void mt76u_tx_status_data(struct work_struct *work) 844 { 845 struct mt76_usb *usb; 846 struct mt76_dev *dev; 847 u8 update = 1; 848 u16 count = 0; 849 850 usb = container_of(work, struct mt76_usb, stat_work); 851 dev = container_of(usb, struct mt76_dev, usb); 852 853 while (true) { 854 if (test_bit(MT76_REMOVED, &dev->phy.state)) 855 break; 856 857 if (!dev->drv->tx_status_data(dev, &update)) 858 break; 859 count++; 860 } 861 862 if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state)) 863 queue_work(dev->wq, &usb->stat_work); 864 else 865 clear_bit(MT76_READING_STATS, &dev->phy.state); 866 } 867 868 static void mt76u_complete_tx(struct urb *urb) 869 { 870 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev); 871 struct mt76_queue_entry *e = urb->context; 872 873 if (mt76u_urb_error(urb)) 874 dev_err(dev->dev, "tx urb failed: %d\n", urb->status); 875 e->done = true; 876 877 mt76_worker_schedule(&dev->usb.status_worker); 878 } 879 880 static int 881 mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb, 882 struct urb *urb) 883 { 884 urb->transfer_buffer_length = skb->len; 885 886 if (!dev->usb.sg_en) { 887 urb->transfer_buffer = skb->data; 888 return 0; 889 } 890 891 sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE); 892 urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len); 893 if (!urb->num_sgs) 894 return -ENOMEM; 895 896 return urb->num_sgs; 897 } 898 899 static int 900 mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, 901 struct sk_buff *skb, struct mt76_wcid *wcid, 902 struct ieee80211_sta *sta) 903 { 904 struct mt76_tx_info tx_info = { 905 .skb = skb, 906 }; 907 u16 idx = q->head; 908 int err; 909 910 if (q->queued == q->ndesc) 911 return -ENOSPC; 912 913 skb->prev = skb->next = NULL; 914 err = dev->drv->tx_prepare_skb(dev, NULL, q->qid, wcid, sta, &tx_info); 915 if (err < 0) 916 return err; 917 918 err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb); 919 if (err < 0) 920 return err; 921 922 mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx), 923 q->entry[idx].urb, mt76u_complete_tx, 924 &q->entry[idx]); 925 926 q->head = (q->head + 1) % q->ndesc; 927 q->entry[idx].skb = tx_info.skb; 928 q->entry[idx].wcid = 0xffff; 929 q->queued++; 930 931 return idx; 932 } 933 934 static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q) 935 { 936 struct urb *urb; 937 int err; 938 939 while (q->first != q->head) { 940 urb = q->entry[q->first].urb; 941 942 trace_submit_urb(dev, urb); 943 err = usb_submit_urb(urb, GFP_ATOMIC); 944 if (err < 0) { 945 if (err == -ENODEV) 946 set_bit(MT76_REMOVED, &dev->phy.state); 947 else 948 dev_err(dev->dev, "tx urb submit failed:%d\n", 949 err); 950 break; 951 } 952 q->first = (q->first + 1) % q->ndesc; 953 } 954 } 955 956 static u8 mt76u_ac_to_hwq(struct mt76_dev *dev, u8 ac) 957 { 958 if (mt76_chip(dev) == 0x7663) { 959 static const u8 lmac_queue_map[] = { 960 /* ac to lmac mapping */ 961 [IEEE80211_AC_BK] = 0, 962 [IEEE80211_AC_BE] = 1, 963 [IEEE80211_AC_VI] = 2, 964 [IEEE80211_AC_VO] = 4, 965 }; 966 967 if (WARN_ON(ac >= ARRAY_SIZE(lmac_queue_map))) 968 return 1; /* BE */ 969 970 return lmac_queue_map[ac]; 971 } 972 973 return mt76_ac_to_hwq(ac); 974 } 975 976 static int mt76u_alloc_tx(struct mt76_dev *dev) 977 { 978 struct mt76_queue *q; 979 int i, j, err; 980 981 for (i = 0; i <= MT_TXQ_PSD; i++) { 982 if (i >= IEEE80211_NUM_ACS) { 983 dev->phy.q_tx[i] = dev->phy.q_tx[0]; 984 continue; 985 } 986 987 q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL); 988 if (!q) 989 return -ENOMEM; 990 991 spin_lock_init(&q->lock); 992 q->hw_idx = mt76u_ac_to_hwq(dev, i); 993 q->qid = i; 994 995 dev->phy.q_tx[i] = q; 996 997 q->entry = devm_kcalloc(dev->dev, 998 MT_NUM_TX_ENTRIES, sizeof(*q->entry), 999 GFP_KERNEL); 1000 if (!q->entry) 1001 return -ENOMEM; 1002 1003 q->ndesc = MT_NUM_TX_ENTRIES; 1004 for (j = 0; j < q->ndesc; j++) { 1005 err = mt76u_urb_alloc(dev, &q->entry[j], 1006 MT_TX_SG_MAX_SIZE); 1007 if (err < 0) 1008 return err; 1009 } 1010 } 1011 return 0; 1012 } 1013 1014 static void mt76u_free_tx(struct mt76_dev *dev) 1015 { 1016 int i; 1017 1018 mt76_worker_teardown(&dev->usb.status_worker); 1019 1020 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1021 struct mt76_queue *q; 1022 int j; 1023 1024 q = dev->phy.q_tx[i]; 1025 if (!q) 1026 continue; 1027 1028 for (j = 0; j < q->ndesc; j++) { 1029 usb_free_urb(q->entry[j].urb); 1030 q->entry[j].urb = NULL; 1031 } 1032 } 1033 } 1034 1035 void mt76u_stop_tx(struct mt76_dev *dev) 1036 { 1037 int ret; 1038 1039 mt76_worker_disable(&dev->usb.status_worker); 1040 1041 ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy), 1042 HZ / 5); 1043 if (!ret) { 1044 struct mt76_queue_entry entry; 1045 struct mt76_queue *q; 1046 int i, j; 1047 1048 dev_err(dev->dev, "timed out waiting for pending tx\n"); 1049 1050 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1051 q = dev->phy.q_tx[i]; 1052 if (!q) 1053 continue; 1054 1055 for (j = 0; j < q->ndesc; j++) 1056 usb_kill_urb(q->entry[j].urb); 1057 } 1058 1059 mt76_worker_disable(&dev->tx_worker); 1060 1061 /* On device removal we maight queue skb's, but mt76u_tx_kick() 1062 * will fail to submit urb, cleanup those skb's manually. 1063 */ 1064 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1065 q = dev->phy.q_tx[i]; 1066 if (!q) 1067 continue; 1068 1069 while (q->queued > 0) { 1070 entry = q->entry[q->tail]; 1071 q->entry[q->tail].done = false; 1072 mt76_queue_tx_complete(dev, q, &entry); 1073 } 1074 } 1075 1076 mt76_worker_enable(&dev->tx_worker); 1077 } 1078 1079 cancel_work_sync(&dev->usb.stat_work); 1080 clear_bit(MT76_READING_STATS, &dev->phy.state); 1081 1082 mt76_worker_enable(&dev->usb.status_worker); 1083 1084 mt76_tx_status_check(dev, true); 1085 } 1086 EXPORT_SYMBOL_GPL(mt76u_stop_tx); 1087 1088 void mt76u_queues_deinit(struct mt76_dev *dev) 1089 { 1090 mt76u_stop_rx(dev); 1091 mt76u_stop_tx(dev); 1092 1093 mt76u_free_rx(dev); 1094 mt76u_free_tx(dev); 1095 } 1096 EXPORT_SYMBOL_GPL(mt76u_queues_deinit); 1097 1098 int mt76u_alloc_queues(struct mt76_dev *dev) 1099 { 1100 int err; 1101 1102 err = mt76u_alloc_rx_queue(dev, MT_RXQ_MAIN); 1103 if (err < 0) 1104 return err; 1105 1106 return mt76u_alloc_tx(dev); 1107 } 1108 EXPORT_SYMBOL_GPL(mt76u_alloc_queues); 1109 1110 static const struct mt76_queue_ops usb_queue_ops = { 1111 .tx_queue_skb = mt76u_tx_queue_skb, 1112 .kick = mt76u_tx_kick, 1113 }; 1114 1115 int mt76u_init(struct mt76_dev *dev, 1116 struct usb_interface *intf, bool ext) 1117 { 1118 static struct mt76_bus_ops mt76u_ops = { 1119 .read_copy = mt76u_read_copy_ext, 1120 .wr_rp = mt76u_wr_rp, 1121 .rd_rp = mt76u_rd_rp, 1122 .type = MT76_BUS_USB, 1123 }; 1124 struct usb_device *udev = interface_to_usbdev(intf); 1125 struct mt76_usb *usb = &dev->usb; 1126 int err; 1127 1128 mt76u_ops.rr = ext ? mt76u_rr_ext : mt76u_rr; 1129 mt76u_ops.wr = ext ? mt76u_wr_ext : mt76u_wr; 1130 mt76u_ops.rmw = ext ? mt76u_rmw_ext : mt76u_rmw; 1131 mt76u_ops.write_copy = ext ? mt76u_copy_ext : mt76u_copy; 1132 1133 INIT_WORK(&usb->stat_work, mt76u_tx_status_data); 1134 1135 usb->data_len = usb_maxpacket(udev, usb_sndctrlpipe(udev, 0), 1); 1136 if (usb->data_len < 32) 1137 usb->data_len = 32; 1138 1139 usb->data = devm_kmalloc(dev->dev, usb->data_len, GFP_KERNEL); 1140 if (!usb->data) 1141 return -ENOMEM; 1142 1143 mutex_init(&usb->usb_ctrl_mtx); 1144 dev->bus = &mt76u_ops; 1145 dev->queue_ops = &usb_queue_ops; 1146 1147 dev_set_drvdata(&udev->dev, dev); 1148 1149 usb->sg_en = mt76u_check_sg(dev); 1150 1151 err = mt76u_set_endpoints(intf, usb); 1152 if (err < 0) 1153 return err; 1154 1155 err = mt76_worker_setup(dev->hw, &usb->rx_worker, mt76u_rx_worker, 1156 "usb-rx"); 1157 if (err) 1158 return err; 1159 1160 err = mt76_worker_setup(dev->hw, &usb->status_worker, 1161 mt76u_status_worker, "usb-status"); 1162 if (err) 1163 return err; 1164 1165 sched_set_fifo_low(usb->rx_worker.task); 1166 sched_set_fifo_low(usb->status_worker.task); 1167 1168 return 0; 1169 } 1170 EXPORT_SYMBOL_GPL(mt76u_init); 1171 1172 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>"); 1173 MODULE_LICENSE("Dual BSD/GPL"); 1174