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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
14static bool disable_usb_sg;
15module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644);
16MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support");
17
18static 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
49int 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}
63EXPORT_SYMBOL_GPL(mt76u_vendor_request);
64
65static 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
82static 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
101static 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
112static 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
123static 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
136static 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
151static 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
158static 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
165static 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
176static 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
187static 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
197
198
199
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
219static 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
243static void
244mt76u_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
268void 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}
280EXPORT_SYMBOL_GPL(mt76u_single_wr);
281
282static int
283mt76u_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
299static int
300mt76u_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
309static int
310mt76u_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
326static int
327mt76u_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
336static 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
346static int
347mt76u_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
373static int
374mt76u_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
408static int
409mt76u_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
423static int
424mt76u_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
444static int
445mt76u_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
459static 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
472static void
473mt76u_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
492static struct urb *
493mt76u_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
509static int
510mt76u_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
527static struct sk_buff *
528mt76u_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
539
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
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
566static int
567mt76u_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
603static 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);
632out:
633 spin_unlock_irqrestore(&q->lock, flags);
634}
635
636static int
637mt76u_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
649static void
650mt76u_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
676static 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
688static int
689mt76u_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
708static int
709mt76u_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
733int mt76u_alloc_mcu_queue(struct mt76_dev *dev)
734{
735 return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU);
736}
737EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue);
738
739static void
740mt76u_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
761static 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
771void 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}
785EXPORT_SYMBOL_GPL(mt76u_stop_rx);
786
787int 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}
807EXPORT_SYMBOL_GPL(mt76u_resume_rx);
808
809static 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
843static 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
868static 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
880static int
881mt76u_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
899static int
900mt76u_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
934static 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
956static 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
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;
969
970 return lmac_queue_map[ac];
971 }
972
973 return mt76_ac_to_hwq(ac);
974}
975
976static 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
1014static 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
1035void 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
1062
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, NULL, true);
1085}
1086EXPORT_SYMBOL_GPL(mt76u_stop_tx);
1087
1088void 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}
1096EXPORT_SYMBOL_GPL(mt76u_queues_deinit);
1097
1098int 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}
1108EXPORT_SYMBOL_GPL(mt76u_alloc_queues);
1109
1110static const struct mt76_queue_ops usb_queue_ops = {
1111 .tx_queue_skb = mt76u_tx_queue_skb,
1112 .kick = mt76u_tx_kick,
1113};
1114
1115int 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}
1170EXPORT_SYMBOL_GPL(mt76u_init);
1171
1172MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
1173MODULE_LICENSE("Dual BSD/GPL");
1174
