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 int __mt76u_vendor_request(struct mt76_dev *dev, u8 req, u8 req_type, 19 u16 val, u16 offset, void *buf, size_t len) 20 { 21 struct usb_interface *uintf = to_usb_interface(dev->dev); 22 struct usb_device *udev = interface_to_usbdev(uintf); 23 unsigned int pipe; 24 int i, ret; 25 26 lockdep_assert_held(&dev->usb.usb_ctrl_mtx); 27 28 pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0) 29 : usb_sndctrlpipe(udev, 0); 30 for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) { 31 if (test_bit(MT76_REMOVED, &dev->phy.state)) 32 return -EIO; 33 34 ret = usb_control_msg(udev, pipe, req, req_type, val, 35 offset, buf, len, MT_VEND_REQ_TOUT_MS); 36 if (ret == -ENODEV) 37 set_bit(MT76_REMOVED, &dev->phy.state); 38 if (ret >= 0 || ret == -ENODEV) 39 return ret; 40 usleep_range(5000, 10000); 41 } 42 43 dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n", 44 req, offset, ret); 45 return ret; 46 } 47 EXPORT_SYMBOL_GPL(__mt76u_vendor_request); 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 u32 ___mt76u_rr(struct mt76_dev *dev, u8 req, u8 req_type, 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, req_type, addr >> 16, 72 addr, usb->data, sizeof(__le32)); 73 if (ret == sizeof(__le32)) 74 data = get_unaligned_le32(usb->data); 75 trace_usb_reg_rr(dev, addr, data); 76 77 return data; 78 } 79 EXPORT_SYMBOL_GPL(___mt76u_rr); 80 81 static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr) 82 { 83 u8 req; 84 85 switch (addr & MT_VEND_TYPE_MASK) { 86 case MT_VEND_TYPE_EEPROM: 87 req = MT_VEND_READ_EEPROM; 88 break; 89 case MT_VEND_TYPE_CFG: 90 req = MT_VEND_READ_CFG; 91 break; 92 default: 93 req = MT_VEND_MULTI_READ; 94 break; 95 } 96 97 return ___mt76u_rr(dev, req, USB_DIR_IN | USB_TYPE_VENDOR, 98 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 void ___mt76u_wr(struct mt76_dev *dev, u8 req, u8 req_type, 113 u32 addr, u32 val) 114 { 115 struct mt76_usb *usb = &dev->usb; 116 117 put_unaligned_le32(val, usb->data); 118 __mt76u_vendor_request(dev, req, req_type, addr >> 16, 119 addr, usb->data, sizeof(__le32)); 120 trace_usb_reg_wr(dev, addr, val); 121 } 122 EXPORT_SYMBOL_GPL(___mt76u_wr); 123 124 static void __mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) 125 { 126 u8 req; 127 128 switch (addr & MT_VEND_TYPE_MASK) { 129 case MT_VEND_TYPE_CFG: 130 req = MT_VEND_WRITE_CFG; 131 break; 132 default: 133 req = MT_VEND_MULTI_WRITE; 134 break; 135 } 136 ___mt76u_wr(dev, req, USB_DIR_OUT | USB_TYPE_VENDOR, 137 addr & ~MT_VEND_TYPE_MASK, val); 138 } 139 140 static void mt76u_wr(struct mt76_dev *dev, u32 addr, u32 val) 141 { 142 mutex_lock(&dev->usb.usb_ctrl_mtx); 143 __mt76u_wr(dev, addr, val); 144 mutex_unlock(&dev->usb.usb_ctrl_mtx); 145 } 146 147 static u32 mt76u_rmw(struct mt76_dev *dev, u32 addr, 148 u32 mask, u32 val) 149 { 150 mutex_lock(&dev->usb.usb_ctrl_mtx); 151 val |= __mt76u_rr(dev, addr) & ~mask; 152 __mt76u_wr(dev, addr, val); 153 mutex_unlock(&dev->usb.usb_ctrl_mtx); 154 155 return val; 156 } 157 158 static void mt76u_copy(struct mt76_dev *dev, u32 offset, 159 const void *data, int len) 160 { 161 struct mt76_usb *usb = &dev->usb; 162 const u8 *val = data; 163 int ret; 164 int current_batch_size; 165 int i = 0; 166 167 /* Assure that always a multiple of 4 bytes are copied, 168 * otherwise beacons can be corrupted. 169 * See: "mt76: round up length on mt76_wr_copy" 170 * Commit 850e8f6fbd5d0003b0 171 */ 172 len = round_up(len, 4); 173 174 mutex_lock(&usb->usb_ctrl_mtx); 175 while (i < len) { 176 current_batch_size = min_t(int, usb->data_len, len - i); 177 memcpy(usb->data, val + i, current_batch_size); 178 ret = __mt76u_vendor_request(dev, MT_VEND_MULTI_WRITE, 179 USB_DIR_OUT | USB_TYPE_VENDOR, 180 0, offset + i, usb->data, 181 current_batch_size); 182 if (ret < 0) 183 break; 184 185 i += current_batch_size; 186 } 187 mutex_unlock(&usb->usb_ctrl_mtx); 188 } 189 190 void mt76u_read_copy(struct mt76_dev *dev, u32 offset, 191 void *data, int len) 192 { 193 struct mt76_usb *usb = &dev->usb; 194 int i = 0, batch_len, ret; 195 u8 *val = data; 196 197 len = round_up(len, 4); 198 mutex_lock(&usb->usb_ctrl_mtx); 199 while (i < len) { 200 batch_len = min_t(int, usb->data_len, len - i); 201 ret = __mt76u_vendor_request(dev, MT_VEND_READ_EXT, 202 USB_DIR_IN | USB_TYPE_VENDOR, 203 (offset + i) >> 16, offset + i, 204 usb->data, batch_len); 205 if (ret < 0) 206 break; 207 208 memcpy(val + i, usb->data, batch_len); 209 i += batch_len; 210 } 211 mutex_unlock(&usb->usb_ctrl_mtx); 212 } 213 EXPORT_SYMBOL_GPL(mt76u_read_copy); 214 215 void mt76u_single_wr(struct mt76_dev *dev, const u8 req, 216 const u16 offset, const u32 val) 217 { 218 mutex_lock(&dev->usb.usb_ctrl_mtx); 219 __mt76u_vendor_request(dev, req, 220 USB_DIR_OUT | USB_TYPE_VENDOR, 221 val & 0xffff, offset, NULL, 0); 222 __mt76u_vendor_request(dev, req, 223 USB_DIR_OUT | USB_TYPE_VENDOR, 224 val >> 16, offset + 2, NULL, 0); 225 mutex_unlock(&dev->usb.usb_ctrl_mtx); 226 } 227 EXPORT_SYMBOL_GPL(mt76u_single_wr); 228 229 static int 230 mt76u_req_wr_rp(struct mt76_dev *dev, u32 base, 231 const struct mt76_reg_pair *data, int len) 232 { 233 struct mt76_usb *usb = &dev->usb; 234 235 mutex_lock(&usb->usb_ctrl_mtx); 236 while (len > 0) { 237 __mt76u_wr(dev, base + data->reg, data->value); 238 len--; 239 data++; 240 } 241 mutex_unlock(&usb->usb_ctrl_mtx); 242 243 return 0; 244 } 245 246 static int 247 mt76u_wr_rp(struct mt76_dev *dev, u32 base, 248 const struct mt76_reg_pair *data, int n) 249 { 250 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) 251 return dev->mcu_ops->mcu_wr_rp(dev, base, data, n); 252 else 253 return mt76u_req_wr_rp(dev, base, data, n); 254 } 255 256 static int 257 mt76u_req_rd_rp(struct mt76_dev *dev, u32 base, struct mt76_reg_pair *data, 258 int len) 259 { 260 struct mt76_usb *usb = &dev->usb; 261 262 mutex_lock(&usb->usb_ctrl_mtx); 263 while (len > 0) { 264 data->value = __mt76u_rr(dev, base + data->reg); 265 len--; 266 data++; 267 } 268 mutex_unlock(&usb->usb_ctrl_mtx); 269 270 return 0; 271 } 272 273 static int 274 mt76u_rd_rp(struct mt76_dev *dev, u32 base, 275 struct mt76_reg_pair *data, int n) 276 { 277 if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) 278 return dev->mcu_ops->mcu_rd_rp(dev, base, data, n); 279 else 280 return mt76u_req_rd_rp(dev, base, data, n); 281 } 282 283 static bool mt76u_check_sg(struct mt76_dev *dev) 284 { 285 struct usb_interface *uintf = to_usb_interface(dev->dev); 286 struct usb_device *udev = interface_to_usbdev(uintf); 287 288 return (!disable_usb_sg && udev->bus->sg_tablesize > 0 && 289 (udev->bus->no_sg_constraint || 290 udev->speed == USB_SPEED_WIRELESS)); 291 } 292 293 static int 294 mt76u_set_endpoints(struct usb_interface *intf, 295 struct mt76_usb *usb) 296 { 297 struct usb_host_interface *intf_desc = intf->cur_altsetting; 298 struct usb_endpoint_descriptor *ep_desc; 299 int i, in_ep = 0, out_ep = 0; 300 301 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 302 ep_desc = &intf_desc->endpoint[i].desc; 303 304 if (usb_endpoint_is_bulk_in(ep_desc) && 305 in_ep < __MT_EP_IN_MAX) { 306 usb->in_ep[in_ep] = usb_endpoint_num(ep_desc); 307 in_ep++; 308 } else if (usb_endpoint_is_bulk_out(ep_desc) && 309 out_ep < __MT_EP_OUT_MAX) { 310 usb->out_ep[out_ep] = usb_endpoint_num(ep_desc); 311 out_ep++; 312 } 313 } 314 315 if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX) 316 return -EINVAL; 317 return 0; 318 } 319 320 static int 321 mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76_queue *q, struct urb *urb, 322 int nsgs, gfp_t gfp) 323 { 324 int i; 325 326 for (i = 0; i < nsgs; i++) { 327 struct page *page; 328 void *data; 329 int offset; 330 331 data = page_frag_alloc(&q->rx_page, q->buf_size, gfp); 332 if (!data) 333 break; 334 335 page = virt_to_head_page(data); 336 offset = data - page_address(page); 337 sg_set_page(&urb->sg[i], page, q->buf_size, offset); 338 } 339 340 if (i < nsgs) { 341 int j; 342 343 for (j = nsgs; j < urb->num_sgs; j++) 344 skb_free_frag(sg_virt(&urb->sg[j])); 345 urb->num_sgs = i; 346 } 347 348 urb->num_sgs = max_t(int, i, urb->num_sgs); 349 urb->transfer_buffer_length = urb->num_sgs * q->buf_size; 350 sg_init_marker(urb->sg, urb->num_sgs); 351 352 return i ? : -ENOMEM; 353 } 354 355 static int 356 mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q, 357 struct urb *urb, int nsgs, gfp_t gfp) 358 { 359 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN]; 360 361 if (qid == MT_RXQ_MAIN && dev->usb.sg_en) 362 return mt76u_fill_rx_sg(dev, q, urb, nsgs, gfp); 363 364 urb->transfer_buffer_length = q->buf_size; 365 urb->transfer_buffer = page_frag_alloc(&q->rx_page, q->buf_size, gfp); 366 367 return urb->transfer_buffer ? 0 : -ENOMEM; 368 } 369 370 static int 371 mt76u_urb_alloc(struct mt76_dev *dev, struct mt76_queue_entry *e, 372 int sg_max_size) 373 { 374 unsigned int size = sizeof(struct urb); 375 376 if (dev->usb.sg_en) 377 size += sg_max_size * sizeof(struct scatterlist); 378 379 e->urb = kzalloc(size, GFP_KERNEL); 380 if (!e->urb) 381 return -ENOMEM; 382 383 usb_init_urb(e->urb); 384 385 if (dev->usb.sg_en && sg_max_size > 0) 386 e->urb->sg = (struct scatterlist *)(e->urb + 1); 387 388 return 0; 389 } 390 391 static int 392 mt76u_rx_urb_alloc(struct mt76_dev *dev, struct mt76_queue *q, 393 struct mt76_queue_entry *e) 394 { 395 enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN]; 396 int err, sg_size; 397 398 sg_size = qid == MT_RXQ_MAIN ? MT_RX_SG_MAX_SIZE : 0; 399 err = mt76u_urb_alloc(dev, e, sg_size); 400 if (err) 401 return err; 402 403 return mt76u_refill_rx(dev, q, e->urb, sg_size, GFP_KERNEL); 404 } 405 406 static void mt76u_urb_free(struct urb *urb) 407 { 408 int i; 409 410 for (i = 0; i < urb->num_sgs; i++) 411 skb_free_frag(sg_virt(&urb->sg[i])); 412 413 if (urb->transfer_buffer) 414 skb_free_frag(urb->transfer_buffer); 415 416 usb_free_urb(urb); 417 } 418 419 static void 420 mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index, 421 struct urb *urb, usb_complete_t complete_fn, 422 void *context) 423 { 424 struct usb_interface *uintf = to_usb_interface(dev->dev); 425 struct usb_device *udev = interface_to_usbdev(uintf); 426 unsigned int pipe; 427 428 if (dir == USB_DIR_IN) 429 pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]); 430 else 431 pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]); 432 433 urb->dev = udev; 434 urb->pipe = pipe; 435 urb->complete = complete_fn; 436 urb->context = context; 437 } 438 439 static struct urb * 440 mt76u_get_next_rx_entry(struct mt76_queue *q) 441 { 442 struct urb *urb = NULL; 443 unsigned long flags; 444 445 spin_lock_irqsave(&q->lock, flags); 446 if (q->queued > 0) { 447 urb = q->entry[q->tail].urb; 448 q->tail = (q->tail + 1) % q->ndesc; 449 q->queued--; 450 } 451 spin_unlock_irqrestore(&q->lock, flags); 452 453 return urb; 454 } 455 456 static int 457 mt76u_get_rx_entry_len(struct mt76_dev *dev, u8 *data, 458 u32 data_len) 459 { 460 u16 dma_len, min_len; 461 462 dma_len = get_unaligned_le16(data); 463 if (dev->drv->drv_flags & MT_DRV_RX_DMA_HDR) 464 return dma_len; 465 466 min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + MT_FCE_INFO_LEN; 467 if (data_len < min_len || !dma_len || 468 dma_len + MT_DMA_HDR_LEN > data_len || 469 (dma_len & 0x3)) 470 return -EINVAL; 471 return dma_len; 472 } 473 474 static struct sk_buff * 475 mt76u_build_rx_skb(struct mt76_dev *dev, void *data, 476 int len, int buf_size) 477 { 478 int head_room, drv_flags = dev->drv->drv_flags; 479 struct sk_buff *skb; 480 481 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN; 482 if (SKB_WITH_OVERHEAD(buf_size) < head_room + len) { 483 struct page *page; 484 485 /* slow path, not enough space for data and 486 * skb_shared_info 487 */ 488 skb = alloc_skb(MT_SKB_HEAD_LEN, GFP_ATOMIC); 489 if (!skb) 490 return NULL; 491 492 skb_put_data(skb, data + head_room, MT_SKB_HEAD_LEN); 493 data += head_room + MT_SKB_HEAD_LEN; 494 page = virt_to_head_page(data); 495 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 496 page, data - page_address(page), 497 len - MT_SKB_HEAD_LEN, buf_size); 498 499 return skb; 500 } 501 502 /* fast path */ 503 skb = build_skb(data, buf_size); 504 if (!skb) 505 return NULL; 506 507 skb_reserve(skb, head_room); 508 __skb_put(skb, len); 509 510 return skb; 511 } 512 513 static int 514 mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb, 515 int buf_size) 516 { 517 u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : urb->transfer_buffer; 518 int data_len = urb->num_sgs ? urb->sg[0].length : urb->actual_length; 519 int len, nsgs = 1, head_room, drv_flags = dev->drv->drv_flags; 520 struct sk_buff *skb; 521 522 if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state)) 523 return 0; 524 525 len = mt76u_get_rx_entry_len(dev, data, urb->actual_length); 526 if (len < 0) 527 return 0; 528 529 head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN; 530 data_len = min_t(int, len, data_len - head_room); 531 skb = mt76u_build_rx_skb(dev, data, data_len, buf_size); 532 if (!skb) 533 return 0; 534 535 len -= data_len; 536 while (len > 0 && nsgs < urb->num_sgs) { 537 data_len = min_t(int, len, urb->sg[nsgs].length); 538 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 539 sg_page(&urb->sg[nsgs]), 540 urb->sg[nsgs].offset, data_len, 541 buf_size); 542 len -= data_len; 543 nsgs++; 544 } 545 dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb); 546 547 return nsgs; 548 } 549 550 static void mt76u_complete_rx(struct urb *urb) 551 { 552 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev); 553 struct mt76_queue *q = urb->context; 554 unsigned long flags; 555 556 trace_rx_urb(dev, urb); 557 558 switch (urb->status) { 559 case -ECONNRESET: 560 case -ESHUTDOWN: 561 case -ENOENT: 562 case -EPROTO: 563 return; 564 default: 565 dev_err_ratelimited(dev->dev, "rx urb failed: %d\n", 566 urb->status); 567 fallthrough; 568 case 0: 569 break; 570 } 571 572 spin_lock_irqsave(&q->lock, flags); 573 if (WARN_ONCE(q->entry[q->head].urb != urb, "rx urb mismatch")) 574 goto out; 575 576 q->head = (q->head + 1) % q->ndesc; 577 q->queued++; 578 mt76_worker_schedule(&dev->usb.rx_worker); 579 out: 580 spin_unlock_irqrestore(&q->lock, flags); 581 } 582 583 static int 584 mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid, 585 struct urb *urb) 586 { 587 int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP; 588 589 mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb, 590 mt76u_complete_rx, &dev->q_rx[qid]); 591 trace_submit_urb(dev, urb); 592 593 return usb_submit_urb(urb, GFP_ATOMIC); 594 } 595 596 static void 597 mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 598 { 599 int qid = q - &dev->q_rx[MT_RXQ_MAIN]; 600 struct urb *urb; 601 int err, count; 602 603 while (true) { 604 urb = mt76u_get_next_rx_entry(q); 605 if (!urb) 606 break; 607 608 count = mt76u_process_rx_entry(dev, urb, q->buf_size); 609 if (count > 0) { 610 err = mt76u_refill_rx(dev, q, urb, count, GFP_ATOMIC); 611 if (err < 0) 612 break; 613 } 614 mt76u_submit_rx_buf(dev, qid, urb); 615 } 616 if (qid == MT_RXQ_MAIN) { 617 local_bh_disable(); 618 mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL); 619 local_bh_enable(); 620 } 621 } 622 623 static void mt76u_rx_worker(struct mt76_worker *w) 624 { 625 struct mt76_usb *usb = container_of(w, struct mt76_usb, rx_worker); 626 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb); 627 int i; 628 629 rcu_read_lock(); 630 mt76_for_each_q_rx(dev, i) 631 mt76u_process_rx_queue(dev, &dev->q_rx[i]); 632 rcu_read_unlock(); 633 } 634 635 static int 636 mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid) 637 { 638 struct mt76_queue *q = &dev->q_rx[qid]; 639 unsigned long flags; 640 int i, err = 0; 641 642 spin_lock_irqsave(&q->lock, flags); 643 for (i = 0; i < q->ndesc; i++) { 644 err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb); 645 if (err < 0) 646 break; 647 } 648 q->head = q->tail = 0; 649 q->queued = 0; 650 spin_unlock_irqrestore(&q->lock, flags); 651 652 return err; 653 } 654 655 static int 656 mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid) 657 { 658 struct mt76_queue *q = &dev->q_rx[qid]; 659 int i, err; 660 661 spin_lock_init(&q->lock); 662 q->entry = devm_kcalloc(dev->dev, 663 MT_NUM_RX_ENTRIES, sizeof(*q->entry), 664 GFP_KERNEL); 665 if (!q->entry) 666 return -ENOMEM; 667 668 q->ndesc = MT_NUM_RX_ENTRIES; 669 q->buf_size = PAGE_SIZE; 670 671 for (i = 0; i < q->ndesc; i++) { 672 err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]); 673 if (err < 0) 674 return err; 675 } 676 677 return mt76u_submit_rx_buffers(dev, qid); 678 } 679 680 int mt76u_alloc_mcu_queue(struct mt76_dev *dev) 681 { 682 return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU); 683 } 684 EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue); 685 686 static void 687 mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) 688 { 689 struct page *page; 690 int i; 691 692 for (i = 0; i < q->ndesc; i++) { 693 if (!q->entry[i].urb) 694 continue; 695 696 mt76u_urb_free(q->entry[i].urb); 697 q->entry[i].urb = NULL; 698 } 699 700 if (!q->rx_page.va) 701 return; 702 703 page = virt_to_page(q->rx_page.va); 704 __page_frag_cache_drain(page, q->rx_page.pagecnt_bias); 705 memset(&q->rx_page, 0, sizeof(q->rx_page)); 706 } 707 708 static void mt76u_free_rx(struct mt76_dev *dev) 709 { 710 int i; 711 712 mt76_worker_teardown(&dev->usb.rx_worker); 713 714 mt76_for_each_q_rx(dev, i) 715 mt76u_free_rx_queue(dev, &dev->q_rx[i]); 716 } 717 718 void mt76u_stop_rx(struct mt76_dev *dev) 719 { 720 int i; 721 722 mt76_worker_disable(&dev->usb.rx_worker); 723 724 mt76_for_each_q_rx(dev, i) { 725 struct mt76_queue *q = &dev->q_rx[i]; 726 int j; 727 728 for (j = 0; j < q->ndesc; j++) 729 usb_poison_urb(q->entry[j].urb); 730 } 731 } 732 EXPORT_SYMBOL_GPL(mt76u_stop_rx); 733 734 int mt76u_resume_rx(struct mt76_dev *dev) 735 { 736 int i; 737 738 mt76_for_each_q_rx(dev, i) { 739 struct mt76_queue *q = &dev->q_rx[i]; 740 int err, j; 741 742 for (j = 0; j < q->ndesc; j++) 743 usb_unpoison_urb(q->entry[j].urb); 744 745 err = mt76u_submit_rx_buffers(dev, i); 746 if (err < 0) 747 return err; 748 } 749 750 mt76_worker_enable(&dev->usb.rx_worker); 751 752 return 0; 753 } 754 EXPORT_SYMBOL_GPL(mt76u_resume_rx); 755 756 static void mt76u_status_worker(struct mt76_worker *w) 757 { 758 struct mt76_usb *usb = container_of(w, struct mt76_usb, status_worker); 759 struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb); 760 struct mt76_queue_entry entry; 761 struct mt76_queue *q; 762 int i; 763 764 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 765 q = dev->phy.q_tx[i]; 766 if (!q) 767 continue; 768 769 while (q->queued > 0) { 770 if (!q->entry[q->tail].done) 771 break; 772 773 entry = q->entry[q->tail]; 774 q->entry[q->tail].done = false; 775 776 mt76_queue_tx_complete(dev, q, &entry); 777 } 778 779 if (!q->queued) 780 wake_up(&dev->tx_wait); 781 782 mt76_worker_schedule(&dev->tx_worker); 783 784 if (dev->drv->tx_status_data && 785 !test_and_set_bit(MT76_READING_STATS, &dev->phy.state)) 786 queue_work(dev->wq, &dev->usb.stat_work); 787 } 788 } 789 790 static void mt76u_tx_status_data(struct work_struct *work) 791 { 792 struct mt76_usb *usb; 793 struct mt76_dev *dev; 794 u8 update = 1; 795 u16 count = 0; 796 797 usb = container_of(work, struct mt76_usb, stat_work); 798 dev = container_of(usb, struct mt76_dev, usb); 799 800 while (true) { 801 if (test_bit(MT76_REMOVED, &dev->phy.state)) 802 break; 803 804 if (!dev->drv->tx_status_data(dev, &update)) 805 break; 806 count++; 807 } 808 809 if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state)) 810 queue_work(dev->wq, &usb->stat_work); 811 else 812 clear_bit(MT76_READING_STATS, &dev->phy.state); 813 } 814 815 static void mt76u_complete_tx(struct urb *urb) 816 { 817 struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev); 818 struct mt76_queue_entry *e = urb->context; 819 820 if (mt76u_urb_error(urb)) 821 dev_err(dev->dev, "tx urb failed: %d\n", urb->status); 822 e->done = true; 823 824 mt76_worker_schedule(&dev->usb.status_worker); 825 } 826 827 static int 828 mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb, 829 struct urb *urb) 830 { 831 urb->transfer_buffer_length = skb->len; 832 833 if (!dev->usb.sg_en) { 834 urb->transfer_buffer = skb->data; 835 return 0; 836 } 837 838 sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE); 839 urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len); 840 if (!urb->num_sgs) 841 return -ENOMEM; 842 843 return urb->num_sgs; 844 } 845 846 static int 847 mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q, 848 struct sk_buff *skb, struct mt76_wcid *wcid, 849 struct ieee80211_sta *sta) 850 { 851 struct mt76_tx_info tx_info = { 852 .skb = skb, 853 }; 854 u16 idx = q->head; 855 int err; 856 857 if (q->queued == q->ndesc) 858 return -ENOSPC; 859 860 skb->prev = skb->next = NULL; 861 err = dev->drv->tx_prepare_skb(dev, NULL, q->qid, wcid, sta, &tx_info); 862 if (err < 0) 863 return err; 864 865 err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb); 866 if (err < 0) 867 return err; 868 869 mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx), 870 q->entry[idx].urb, mt76u_complete_tx, 871 &q->entry[idx]); 872 873 q->head = (q->head + 1) % q->ndesc; 874 q->entry[idx].skb = tx_info.skb; 875 q->entry[idx].wcid = 0xffff; 876 q->queued++; 877 878 return idx; 879 } 880 881 static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q) 882 { 883 struct urb *urb; 884 int err; 885 886 while (q->first != q->head) { 887 urb = q->entry[q->first].urb; 888 889 trace_submit_urb(dev, urb); 890 err = usb_submit_urb(urb, GFP_ATOMIC); 891 if (err < 0) { 892 if (err == -ENODEV) 893 set_bit(MT76_REMOVED, &dev->phy.state); 894 else 895 dev_err(dev->dev, "tx urb submit failed:%d\n", 896 err); 897 break; 898 } 899 q->first = (q->first + 1) % q->ndesc; 900 } 901 } 902 903 static u8 mt76u_ac_to_hwq(struct mt76_dev *dev, u8 ac) 904 { 905 if (mt76_chip(dev) == 0x7663) { 906 static const u8 lmac_queue_map[] = { 907 /* ac to lmac mapping */ 908 [IEEE80211_AC_BK] = 0, 909 [IEEE80211_AC_BE] = 1, 910 [IEEE80211_AC_VI] = 2, 911 [IEEE80211_AC_VO] = 4, 912 }; 913 914 if (WARN_ON(ac >= ARRAY_SIZE(lmac_queue_map))) 915 return 1; /* BE */ 916 917 return lmac_queue_map[ac]; 918 } 919 920 return mt76_ac_to_hwq(ac); 921 } 922 923 static int mt76u_alloc_tx(struct mt76_dev *dev) 924 { 925 struct mt76_queue *q; 926 int i, j, err; 927 928 for (i = 0; i <= MT_TXQ_PSD; i++) { 929 if (i >= IEEE80211_NUM_ACS) { 930 dev->phy.q_tx[i] = dev->phy.q_tx[0]; 931 continue; 932 } 933 934 q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL); 935 if (!q) 936 return -ENOMEM; 937 938 spin_lock_init(&q->lock); 939 q->hw_idx = mt76u_ac_to_hwq(dev, i); 940 q->qid = i; 941 942 dev->phy.q_tx[i] = q; 943 944 q->entry = devm_kcalloc(dev->dev, 945 MT_NUM_TX_ENTRIES, sizeof(*q->entry), 946 GFP_KERNEL); 947 if (!q->entry) 948 return -ENOMEM; 949 950 q->ndesc = MT_NUM_TX_ENTRIES; 951 for (j = 0; j < q->ndesc; j++) { 952 err = mt76u_urb_alloc(dev, &q->entry[j], 953 MT_TX_SG_MAX_SIZE); 954 if (err < 0) 955 return err; 956 } 957 } 958 return 0; 959 } 960 961 static void mt76u_free_tx(struct mt76_dev *dev) 962 { 963 int i; 964 965 mt76_worker_teardown(&dev->usb.status_worker); 966 967 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 968 struct mt76_queue *q; 969 int j; 970 971 q = dev->phy.q_tx[i]; 972 if (!q) 973 continue; 974 975 for (j = 0; j < q->ndesc; j++) { 976 usb_free_urb(q->entry[j].urb); 977 q->entry[j].urb = NULL; 978 } 979 } 980 } 981 982 void mt76u_stop_tx(struct mt76_dev *dev) 983 { 984 int ret; 985 986 mt76_worker_disable(&dev->usb.status_worker); 987 988 ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy), 989 HZ / 5); 990 if (!ret) { 991 struct mt76_queue_entry entry; 992 struct mt76_queue *q; 993 int i, j; 994 995 dev_err(dev->dev, "timed out waiting for pending tx\n"); 996 997 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 998 q = dev->phy.q_tx[i]; 999 if (!q) 1000 continue; 1001 1002 for (j = 0; j < q->ndesc; j++) 1003 usb_kill_urb(q->entry[j].urb); 1004 } 1005 1006 mt76_worker_disable(&dev->tx_worker); 1007 1008 /* On device removal we maight queue skb's, but mt76u_tx_kick() 1009 * will fail to submit urb, cleanup those skb's manually. 1010 */ 1011 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 1012 q = dev->phy.q_tx[i]; 1013 if (!q) 1014 continue; 1015 1016 while (q->queued > 0) { 1017 entry = q->entry[q->tail]; 1018 q->entry[q->tail].done = false; 1019 mt76_queue_tx_complete(dev, q, &entry); 1020 } 1021 } 1022 1023 mt76_worker_enable(&dev->tx_worker); 1024 } 1025 1026 cancel_work_sync(&dev->usb.stat_work); 1027 clear_bit(MT76_READING_STATS, &dev->phy.state); 1028 1029 mt76_worker_enable(&dev->usb.status_worker); 1030 1031 mt76_tx_status_check(dev, true); 1032 } 1033 EXPORT_SYMBOL_GPL(mt76u_stop_tx); 1034 1035 void mt76u_queues_deinit(struct mt76_dev *dev) 1036 { 1037 mt76u_stop_rx(dev); 1038 mt76u_stop_tx(dev); 1039 1040 mt76u_free_rx(dev); 1041 mt76u_free_tx(dev); 1042 } 1043 EXPORT_SYMBOL_GPL(mt76u_queues_deinit); 1044 1045 int mt76u_alloc_queues(struct mt76_dev *dev) 1046 { 1047 int err; 1048 1049 err = mt76u_alloc_rx_queue(dev, MT_RXQ_MAIN); 1050 if (err < 0) 1051 return err; 1052 1053 return mt76u_alloc_tx(dev); 1054 } 1055 EXPORT_SYMBOL_GPL(mt76u_alloc_queues); 1056 1057 static const struct mt76_queue_ops usb_queue_ops = { 1058 .tx_queue_skb = mt76u_tx_queue_skb, 1059 .kick = mt76u_tx_kick, 1060 }; 1061 1062 int __mt76u_init(struct mt76_dev *dev, struct usb_interface *intf, 1063 struct mt76_bus_ops *ops) 1064 { 1065 struct usb_device *udev = interface_to_usbdev(intf); 1066 struct mt76_usb *usb = &dev->usb; 1067 int err; 1068 1069 INIT_WORK(&usb->stat_work, mt76u_tx_status_data); 1070 1071 usb->data_len = usb_maxpacket(udev, usb_sndctrlpipe(udev, 0), 1); 1072 if (usb->data_len < 32) 1073 usb->data_len = 32; 1074 1075 usb->data = devm_kmalloc(dev->dev, usb->data_len, GFP_KERNEL); 1076 if (!usb->data) 1077 return -ENOMEM; 1078 1079 mutex_init(&usb->usb_ctrl_mtx); 1080 dev->bus = ops; 1081 dev->queue_ops = &usb_queue_ops; 1082 1083 dev_set_drvdata(&udev->dev, dev); 1084 1085 usb->sg_en = mt76u_check_sg(dev); 1086 1087 err = mt76u_set_endpoints(intf, usb); 1088 if (err < 0) 1089 return err; 1090 1091 err = mt76_worker_setup(dev->hw, &usb->rx_worker, mt76u_rx_worker, 1092 "usb-rx"); 1093 if (err) 1094 return err; 1095 1096 err = mt76_worker_setup(dev->hw, &usb->status_worker, 1097 mt76u_status_worker, "usb-status"); 1098 if (err) 1099 return err; 1100 1101 sched_set_fifo_low(usb->rx_worker.task); 1102 sched_set_fifo_low(usb->status_worker.task); 1103 1104 return 0; 1105 } 1106 EXPORT_SYMBOL_GPL(__mt76u_init); 1107 1108 int mt76u_init(struct mt76_dev *dev, struct usb_interface *intf) 1109 { 1110 static struct mt76_bus_ops bus_ops = { 1111 .rr = mt76u_rr, 1112 .wr = mt76u_wr, 1113 .rmw = mt76u_rmw, 1114 .read_copy = mt76u_read_copy, 1115 .write_copy = mt76u_copy, 1116 .wr_rp = mt76u_wr_rp, 1117 .rd_rp = mt76u_rd_rp, 1118 .type = MT76_BUS_USB, 1119 }; 1120 1121 return __mt76u_init(dev, intf, &bus_ops); 1122 } 1123 EXPORT_SYMBOL_GPL(mt76u_init); 1124 1125 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>"); 1126 MODULE_LICENSE("Dual BSD/GPL"); 1127