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 
__mt76u_vendor_request(struct mt76_dev * dev,u8 req,u8 req_type,u16 val,u16 offset,void * buf,size_t len)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 
mt76u_vendor_request(struct mt76_dev * dev,u8 req,u8 req_type,u16 val,u16 offset,void * buf,size_t len)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 
___mt76u_rr(struct mt76_dev * dev,u8 req,u8 req_type,u32 addr)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 
__mt76u_rr(struct mt76_dev * dev,u32 addr)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 
mt76u_rr(struct mt76_dev * dev,u32 addr)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 
___mt76u_wr(struct mt76_dev * dev,u8 req,u8 req_type,u32 addr,u32 val)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 
__mt76u_wr(struct mt76_dev * dev,u32 addr,u32 val)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 
mt76u_wr(struct mt76_dev * dev,u32 addr,u32 val)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 
mt76u_rmw(struct mt76_dev * dev,u32 addr,u32 mask,u32 val)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 
mt76u_copy(struct mt76_dev * dev,u32 offset,const void * data,int len)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 
mt76u_read_copy(struct mt76_dev * dev,u32 offset,void * data,int len)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 
mt76u_single_wr(struct mt76_dev * dev,const u8 req,const u16 offset,const u32 val)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
mt76u_req_wr_rp(struct mt76_dev * dev,u32 base,const struct mt76_reg_pair * data,int len)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
mt76u_wr_rp(struct mt76_dev * dev,u32 base,const struct mt76_reg_pair * data,int n)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
mt76u_req_rd_rp(struct mt76_dev * dev,u32 base,struct mt76_reg_pair * data,int len)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
mt76u_rd_rp(struct mt76_dev * dev,u32 base,struct mt76_reg_pair * data,int n)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 
mt76u_check_sg(struct mt76_dev * dev)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 }
291 
292 static int
mt76u_set_endpoints(struct usb_interface * intf,struct mt76_usb * usb)293 mt76u_set_endpoints(struct usb_interface *intf,
294 		    struct mt76_usb *usb)
295 {
296 	struct usb_host_interface *intf_desc = intf->cur_altsetting;
297 	struct usb_endpoint_descriptor *ep_desc;
298 	int i, in_ep = 0, out_ep = 0;
299 
300 	for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
301 		ep_desc = &intf_desc->endpoint[i].desc;
302 
303 		if (usb_endpoint_is_bulk_in(ep_desc) &&
304 		    in_ep < __MT_EP_IN_MAX) {
305 			usb->in_ep[in_ep] = usb_endpoint_num(ep_desc);
306 			in_ep++;
307 		} else if (usb_endpoint_is_bulk_out(ep_desc) &&
308 			   out_ep < __MT_EP_OUT_MAX) {
309 			usb->out_ep[out_ep] = usb_endpoint_num(ep_desc);
310 			out_ep++;
311 		}
312 	}
313 
314 	if (in_ep != __MT_EP_IN_MAX || out_ep != __MT_EP_OUT_MAX)
315 		return -EINVAL;
316 	return 0;
317 }
318 
319 static int
mt76u_fill_rx_sg(struct mt76_dev * dev,struct mt76_queue * q,struct urb * urb,int nsgs)320 mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76_queue *q, struct urb *urb,
321 		 int nsgs)
322 {
323 	int i;
324 
325 	for (i = 0; i < nsgs; i++) {
326 		void *data;
327 		int offset;
328 
329 		data = mt76_get_page_pool_buf(q, &offset, q->buf_size);
330 		if (!data)
331 			break;
332 
333 		sg_set_page(&urb->sg[i], virt_to_head_page(data), q->buf_size,
334 			    offset);
335 	}
336 
337 	if (i < nsgs) {
338 		int j;
339 
340 		for (j = nsgs; j < urb->num_sgs; j++)
341 			mt76_put_page_pool_buf(sg_virt(&urb->sg[j]), false);
342 		urb->num_sgs = i;
343 	}
344 
345 	urb->num_sgs = max_t(int, i, urb->num_sgs);
346 	urb->transfer_buffer_length = urb->num_sgs * q->buf_size;
347 	sg_init_marker(urb->sg, urb->num_sgs);
348 
349 	return i ? : -ENOMEM;
350 }
351 
352 static int
mt76u_refill_rx(struct mt76_dev * dev,struct mt76_queue * q,struct urb * urb,int nsgs)353 mt76u_refill_rx(struct mt76_dev *dev, struct mt76_queue *q,
354 		struct urb *urb, int nsgs)
355 {
356 	enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
357 	int offset;
358 
359 	if (qid == MT_RXQ_MAIN && dev->usb.sg_en)
360 		return mt76u_fill_rx_sg(dev, q, urb, nsgs);
361 
362 	urb->transfer_buffer_length = q->buf_size;
363 	urb->transfer_buffer = mt76_get_page_pool_buf(q, &offset, q->buf_size);
364 
365 	return urb->transfer_buffer ? 0 : -ENOMEM;
366 }
367 
368 static int
mt76u_urb_alloc(struct mt76_dev * dev,struct mt76_queue_entry * e,int sg_max_size)369 mt76u_urb_alloc(struct mt76_dev *dev, struct mt76_queue_entry *e,
370 		int sg_max_size)
371 {
372 	unsigned int size = sizeof(struct urb);
373 
374 	if (dev->usb.sg_en)
375 		size += sg_max_size * sizeof(struct scatterlist);
376 
377 	e->urb = kzalloc(size, GFP_KERNEL);
378 	if (!e->urb)
379 		return -ENOMEM;
380 
381 	usb_init_urb(e->urb);
382 
383 	if (dev->usb.sg_en && sg_max_size > 0)
384 		e->urb->sg = (struct scatterlist *)(e->urb + 1);
385 
386 	return 0;
387 }
388 
389 static int
mt76u_rx_urb_alloc(struct mt76_dev * dev,struct mt76_queue * q,struct mt76_queue_entry * e)390 mt76u_rx_urb_alloc(struct mt76_dev *dev, struct mt76_queue *q,
391 		   struct mt76_queue_entry *e)
392 {
393 	enum mt76_rxq_id qid = q - &dev->q_rx[MT_RXQ_MAIN];
394 	int err, sg_size;
395 
396 	sg_size = qid == MT_RXQ_MAIN ? MT_RX_SG_MAX_SIZE : 0;
397 	err = mt76u_urb_alloc(dev, e, sg_size);
398 	if (err)
399 		return err;
400 
401 	return mt76u_refill_rx(dev, q, e->urb, sg_size);
402 }
403 
mt76u_urb_free(struct urb * urb)404 static void mt76u_urb_free(struct urb *urb)
405 {
406 	int i;
407 
408 	for (i = 0; i < urb->num_sgs; i++)
409 		mt76_put_page_pool_buf(sg_virt(&urb->sg[i]), false);
410 
411 	if (urb->transfer_buffer)
412 		mt76_put_page_pool_buf(urb->transfer_buffer, false);
413 
414 	usb_free_urb(urb);
415 }
416 
417 static void
mt76u_fill_bulk_urb(struct mt76_dev * dev,int dir,int index,struct urb * urb,usb_complete_t complete_fn,void * context)418 mt76u_fill_bulk_urb(struct mt76_dev *dev, int dir, int index,
419 		    struct urb *urb, usb_complete_t complete_fn,
420 		    void *context)
421 {
422 	struct usb_interface *uintf = to_usb_interface(dev->dev);
423 	struct usb_device *udev = interface_to_usbdev(uintf);
424 	unsigned int pipe;
425 
426 	if (dir == USB_DIR_IN)
427 		pipe = usb_rcvbulkpipe(udev, dev->usb.in_ep[index]);
428 	else
429 		pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]);
430 
431 	urb->dev = udev;
432 	urb->pipe = pipe;
433 	urb->complete = complete_fn;
434 	urb->context = context;
435 }
436 
437 static struct urb *
mt76u_get_next_rx_entry(struct mt76_queue * q)438 mt76u_get_next_rx_entry(struct mt76_queue *q)
439 {
440 	struct urb *urb = NULL;
441 	unsigned long flags;
442 
443 	spin_lock_irqsave(&q->lock, flags);
444 	if (q->queued > 0) {
445 		urb = q->entry[q->tail].urb;
446 		q->tail = (q->tail + 1) % q->ndesc;
447 		q->queued--;
448 	}
449 	spin_unlock_irqrestore(&q->lock, flags);
450 
451 	return urb;
452 }
453 
454 static int
mt76u_get_rx_entry_len(struct mt76_dev * dev,u8 * data,u32 data_len)455 mt76u_get_rx_entry_len(struct mt76_dev *dev, u8 *data,
456 		       u32 data_len)
457 {
458 	u16 dma_len, min_len;
459 
460 	dma_len = get_unaligned_le16(data);
461 	if (dev->drv->drv_flags & MT_DRV_RX_DMA_HDR)
462 		return dma_len;
463 
464 	min_len = MT_DMA_HDR_LEN + MT_RX_RXWI_LEN + MT_FCE_INFO_LEN;
465 	if (data_len < min_len || !dma_len ||
466 	    dma_len + MT_DMA_HDR_LEN > data_len ||
467 	    (dma_len & 0x3))
468 		return -EINVAL;
469 	return dma_len;
470 }
471 
472 static struct sk_buff *
mt76u_build_rx_skb(struct mt76_dev * dev,void * data,int len,int buf_size)473 mt76u_build_rx_skb(struct mt76_dev *dev, void *data,
474 		   int len, int buf_size)
475 {
476 	int head_room, drv_flags = dev->drv->drv_flags;
477 	struct sk_buff *skb;
478 
479 	head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
480 	if (SKB_WITH_OVERHEAD(buf_size) < head_room + len) {
481 		struct page *page;
482 
483 		/* slow path, not enough space for data and
484 		 * skb_shared_info
485 		 */
486 		skb = alloc_skb(MT_SKB_HEAD_LEN, GFP_ATOMIC);
487 		if (!skb)
488 			return NULL;
489 
490 		skb_put_data(skb, data + head_room, MT_SKB_HEAD_LEN);
491 		data += head_room + MT_SKB_HEAD_LEN;
492 		page = virt_to_head_page(data);
493 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
494 				page, data - page_address(page),
495 				len - MT_SKB_HEAD_LEN, buf_size);
496 
497 		return skb;
498 	}
499 
500 	/* fast path */
501 	skb = build_skb(data, buf_size);
502 	if (!skb)
503 		return NULL;
504 
505 	skb_reserve(skb, head_room);
506 	__skb_put(skb, len);
507 
508 	return skb;
509 }
510 
511 static int
mt76u_process_rx_entry(struct mt76_dev * dev,struct urb * urb,int buf_size)512 mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb,
513 		       int buf_size)
514 {
515 	u8 *data = urb->num_sgs ? sg_virt(&urb->sg[0]) : urb->transfer_buffer;
516 	int data_len = urb->num_sgs ? urb->sg[0].length : urb->actual_length;
517 	int len, nsgs = 1, head_room, drv_flags = dev->drv->drv_flags;
518 	struct sk_buff *skb;
519 
520 	if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state))
521 		return 0;
522 
523 	len = mt76u_get_rx_entry_len(dev, data, urb->actual_length);
524 	if (len < 0)
525 		return 0;
526 
527 	head_room = drv_flags & MT_DRV_RX_DMA_HDR ? 0 : MT_DMA_HDR_LEN;
528 	data_len = min_t(int, len, data_len - head_room);
529 
530 	if (len == data_len &&
531 	    dev->drv->rx_check && !dev->drv->rx_check(dev, data, data_len))
532 		return 0;
533 
534 	skb = mt76u_build_rx_skb(dev, data, data_len, buf_size);
535 	if (!skb)
536 		return 0;
537 
538 	len -= data_len;
539 	while (len > 0 && nsgs < urb->num_sgs) {
540 		data_len = min_t(int, len, urb->sg[nsgs].length);
541 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
542 				sg_page(&urb->sg[nsgs]),
543 				urb->sg[nsgs].offset, data_len,
544 				buf_size);
545 		len -= data_len;
546 		nsgs++;
547 	}
548 
549 	skb_mark_for_recycle(skb);
550 	dev->drv->rx_skb(dev, MT_RXQ_MAIN, skb, NULL);
551 
552 	return nsgs;
553 }
554 
mt76u_complete_rx(struct urb * urb)555 static void mt76u_complete_rx(struct urb *urb)
556 {
557 	struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
558 	struct mt76_queue *q = urb->context;
559 	unsigned long flags;
560 
561 	trace_rx_urb(dev, urb);
562 
563 	switch (urb->status) {
564 	case -ECONNRESET:
565 	case -ESHUTDOWN:
566 	case -ENOENT:
567 	case -EPROTO:
568 		return;
569 	default:
570 		dev_err_ratelimited(dev->dev, "rx urb failed: %d\n",
571 				    urb->status);
572 		fallthrough;
573 	case 0:
574 		break;
575 	}
576 
577 	spin_lock_irqsave(&q->lock, flags);
578 	if (WARN_ONCE(q->entry[q->head].urb != urb, "rx urb mismatch"))
579 		goto out;
580 
581 	q->head = (q->head + 1) % q->ndesc;
582 	q->queued++;
583 	mt76_worker_schedule(&dev->usb.rx_worker);
584 out:
585 	spin_unlock_irqrestore(&q->lock, flags);
586 }
587 
588 static int
mt76u_submit_rx_buf(struct mt76_dev * dev,enum mt76_rxq_id qid,struct urb * urb)589 mt76u_submit_rx_buf(struct mt76_dev *dev, enum mt76_rxq_id qid,
590 		    struct urb *urb)
591 {
592 	int ep = qid == MT_RXQ_MAIN ? MT_EP_IN_PKT_RX : MT_EP_IN_CMD_RESP;
593 
594 	mt76u_fill_bulk_urb(dev, USB_DIR_IN, ep, urb,
595 			    mt76u_complete_rx, &dev->q_rx[qid]);
596 	trace_submit_urb(dev, urb);
597 
598 	return usb_submit_urb(urb, GFP_ATOMIC);
599 }
600 
601 static void
mt76u_process_rx_queue(struct mt76_dev * dev,struct mt76_queue * q)602 mt76u_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
603 {
604 	int qid = q - &dev->q_rx[MT_RXQ_MAIN];
605 	struct urb *urb;
606 	int err, count;
607 
608 	while (true) {
609 		urb = mt76u_get_next_rx_entry(q);
610 		if (!urb)
611 			break;
612 
613 		count = mt76u_process_rx_entry(dev, urb, q->buf_size);
614 		if (count > 0) {
615 			err = mt76u_refill_rx(dev, q, urb, count);
616 			if (err < 0)
617 				break;
618 		}
619 		mt76u_submit_rx_buf(dev, qid, urb);
620 	}
621 	if (qid == MT_RXQ_MAIN) {
622 		local_bh_disable();
623 		mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL);
624 		local_bh_enable();
625 	}
626 }
627 
mt76u_rx_worker(struct mt76_worker * w)628 static void mt76u_rx_worker(struct mt76_worker *w)
629 {
630 	struct mt76_usb *usb = container_of(w, struct mt76_usb, rx_worker);
631 	struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb);
632 	int i;
633 
634 	rcu_read_lock();
635 	mt76_for_each_q_rx(dev, i)
636 		mt76u_process_rx_queue(dev, &dev->q_rx[i]);
637 	rcu_read_unlock();
638 }
639 
640 static int
mt76u_submit_rx_buffers(struct mt76_dev * dev,enum mt76_rxq_id qid)641 mt76u_submit_rx_buffers(struct mt76_dev *dev, enum mt76_rxq_id qid)
642 {
643 	struct mt76_queue *q = &dev->q_rx[qid];
644 	unsigned long flags;
645 	int i, err = 0;
646 
647 	spin_lock_irqsave(&q->lock, flags);
648 	for (i = 0; i < q->ndesc; i++) {
649 		err = mt76u_submit_rx_buf(dev, qid, q->entry[i].urb);
650 		if (err < 0)
651 			break;
652 	}
653 	q->head = q->tail = 0;
654 	q->queued = 0;
655 	spin_unlock_irqrestore(&q->lock, flags);
656 
657 	return err;
658 }
659 
660 static int
mt76u_alloc_rx_queue(struct mt76_dev * dev,enum mt76_rxq_id qid)661 mt76u_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid)
662 {
663 	struct mt76_queue *q = &dev->q_rx[qid];
664 	int i, err;
665 
666 	err = mt76_create_page_pool(dev, q);
667 	if (err)
668 		return err;
669 
670 	spin_lock_init(&q->lock);
671 	q->entry = devm_kcalloc(dev->dev,
672 				MT_NUM_RX_ENTRIES, sizeof(*q->entry),
673 				GFP_KERNEL);
674 	if (!q->entry)
675 		return -ENOMEM;
676 
677 	q->ndesc = MT_NUM_RX_ENTRIES;
678 	q->buf_size = PAGE_SIZE;
679 
680 	for (i = 0; i < q->ndesc; i++) {
681 		err = mt76u_rx_urb_alloc(dev, q, &q->entry[i]);
682 		if (err < 0)
683 			return err;
684 	}
685 
686 	return mt76u_submit_rx_buffers(dev, qid);
687 }
688 
mt76u_alloc_mcu_queue(struct mt76_dev * dev)689 int mt76u_alloc_mcu_queue(struct mt76_dev *dev)
690 {
691 	return mt76u_alloc_rx_queue(dev, MT_RXQ_MCU);
692 }
693 EXPORT_SYMBOL_GPL(mt76u_alloc_mcu_queue);
694 
695 static void
mt76u_free_rx_queue(struct mt76_dev * dev,struct mt76_queue * q)696 mt76u_free_rx_queue(struct mt76_dev *dev, struct mt76_queue *q)
697 {
698 	int i;
699 
700 	for (i = 0; i < q->ndesc; i++) {
701 		if (!q->entry[i].urb)
702 			continue;
703 
704 		mt76u_urb_free(q->entry[i].urb);
705 		q->entry[i].urb = NULL;
706 	}
707 	page_pool_destroy(q->page_pool);
708 	q->page_pool = NULL;
709 }
710 
mt76u_free_rx(struct mt76_dev * dev)711 static void mt76u_free_rx(struct mt76_dev *dev)
712 {
713 	int i;
714 
715 	mt76_worker_teardown(&dev->usb.rx_worker);
716 
717 	mt76_for_each_q_rx(dev, i)
718 		mt76u_free_rx_queue(dev, &dev->q_rx[i]);
719 }
720 
mt76u_stop_rx(struct mt76_dev * dev)721 void mt76u_stop_rx(struct mt76_dev *dev)
722 {
723 	int i;
724 
725 	mt76_worker_disable(&dev->usb.rx_worker);
726 
727 	mt76_for_each_q_rx(dev, i) {
728 		struct mt76_queue *q = &dev->q_rx[i];
729 		int j;
730 
731 		for (j = 0; j < q->ndesc; j++)
732 			usb_poison_urb(q->entry[j].urb);
733 	}
734 }
735 EXPORT_SYMBOL_GPL(mt76u_stop_rx);
736 
mt76u_resume_rx(struct mt76_dev * dev)737 int mt76u_resume_rx(struct mt76_dev *dev)
738 {
739 	int i;
740 
741 	mt76_for_each_q_rx(dev, i) {
742 		struct mt76_queue *q = &dev->q_rx[i];
743 		int err, j;
744 
745 		for (j = 0; j < q->ndesc; j++)
746 			usb_unpoison_urb(q->entry[j].urb);
747 
748 		err = mt76u_submit_rx_buffers(dev, i);
749 		if (err < 0)
750 			return err;
751 	}
752 
753 	mt76_worker_enable(&dev->usb.rx_worker);
754 
755 	return 0;
756 }
757 EXPORT_SYMBOL_GPL(mt76u_resume_rx);
758 
mt76u_status_worker(struct mt76_worker * w)759 static void mt76u_status_worker(struct mt76_worker *w)
760 {
761 	struct mt76_usb *usb = container_of(w, struct mt76_usb, status_worker);
762 	struct mt76_dev *dev = container_of(usb, struct mt76_dev, usb);
763 	struct mt76_queue_entry entry;
764 	struct mt76_queue *q;
765 	int i;
766 
767 	if (!test_bit(MT76_STATE_RUNNING, &dev->phy.state))
768 		return;
769 
770 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
771 		q = dev->phy.q_tx[i];
772 		if (!q)
773 			continue;
774 
775 		while (q->queued > 0) {
776 			if (!q->entry[q->tail].done)
777 				break;
778 
779 			entry = q->entry[q->tail];
780 			q->entry[q->tail].done = false;
781 
782 			mt76_queue_tx_complete(dev, q, &entry);
783 		}
784 
785 		if (!q->queued)
786 			wake_up(&dev->tx_wait);
787 
788 		mt76_worker_schedule(&dev->tx_worker);
789 	}
790 
791 	if (dev->drv->tx_status_data &&
792 	    !test_and_set_bit(MT76_READING_STATS, &dev->phy.state))
793 		queue_work(dev->wq, &dev->usb.stat_work);
794 }
795 
mt76u_tx_status_data(struct work_struct * work)796 static void mt76u_tx_status_data(struct work_struct *work)
797 {
798 	struct mt76_usb *usb;
799 	struct mt76_dev *dev;
800 	u8 update = 1;
801 	u16 count = 0;
802 
803 	usb = container_of(work, struct mt76_usb, stat_work);
804 	dev = container_of(usb, struct mt76_dev, usb);
805 
806 	while (true) {
807 		if (test_bit(MT76_REMOVED, &dev->phy.state))
808 			break;
809 
810 		if (!dev->drv->tx_status_data(dev, &update))
811 			break;
812 		count++;
813 	}
814 
815 	if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state))
816 		queue_work(dev->wq, &usb->stat_work);
817 	else
818 		clear_bit(MT76_READING_STATS, &dev->phy.state);
819 }
820 
mt76u_complete_tx(struct urb * urb)821 static void mt76u_complete_tx(struct urb *urb)
822 {
823 	struct mt76_dev *dev = dev_get_drvdata(&urb->dev->dev);
824 	struct mt76_queue_entry *e = urb->context;
825 
826 	if (mt76u_urb_error(urb))
827 		dev_err(dev->dev, "tx urb failed: %d\n", urb->status);
828 	e->done = true;
829 
830 	mt76_worker_schedule(&dev->usb.status_worker);
831 }
832 
833 static int
mt76u_tx_setup_buffers(struct mt76_dev * dev,struct sk_buff * skb,struct urb * urb)834 mt76u_tx_setup_buffers(struct mt76_dev *dev, struct sk_buff *skb,
835 		       struct urb *urb)
836 {
837 	urb->transfer_buffer_length = skb->len;
838 
839 	if (!dev->usb.sg_en) {
840 		urb->transfer_buffer = skb->data;
841 		return 0;
842 	}
843 
844 	sg_init_table(urb->sg, MT_TX_SG_MAX_SIZE);
845 	urb->num_sgs = skb_to_sgvec(skb, urb->sg, 0, skb->len);
846 	if (!urb->num_sgs)
847 		return -ENOMEM;
848 
849 	return urb->num_sgs;
850 }
851 
852 static int
mt76u_tx_queue_skb(struct mt76_dev * dev,struct mt76_queue * q,enum mt76_txq_id qid,struct sk_buff * skb,struct mt76_wcid * wcid,struct ieee80211_sta * sta)853 mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
854 		   enum mt76_txq_id qid, struct sk_buff *skb,
855 		   struct mt76_wcid *wcid, struct ieee80211_sta *sta)
856 {
857 	struct mt76_tx_info tx_info = {
858 		.skb = skb,
859 	};
860 	u16 idx = q->head;
861 	int err;
862 
863 	if (q->queued == q->ndesc)
864 		return -ENOSPC;
865 
866 	skb->prev = skb->next = NULL;
867 	err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info);
868 	if (err < 0)
869 		return err;
870 
871 	err = mt76u_tx_setup_buffers(dev, tx_info.skb, q->entry[idx].urb);
872 	if (err < 0)
873 		return err;
874 
875 	mt76u_fill_bulk_urb(dev, USB_DIR_OUT, q2ep(q->hw_idx),
876 			    q->entry[idx].urb, mt76u_complete_tx,
877 			    &q->entry[idx]);
878 
879 	q->head = (q->head + 1) % q->ndesc;
880 	q->entry[idx].skb = tx_info.skb;
881 	q->entry[idx].wcid = 0xffff;
882 	q->queued++;
883 
884 	return idx;
885 }
886 
mt76u_tx_kick(struct mt76_dev * dev,struct mt76_queue * q)887 static void mt76u_tx_kick(struct mt76_dev *dev, struct mt76_queue *q)
888 {
889 	struct urb *urb;
890 	int err;
891 
892 	while (q->first != q->head) {
893 		urb = q->entry[q->first].urb;
894 
895 		trace_submit_urb(dev, urb);
896 		err = usb_submit_urb(urb, GFP_ATOMIC);
897 		if (err < 0) {
898 			if (err == -ENODEV)
899 				set_bit(MT76_REMOVED, &dev->phy.state);
900 			else
901 				dev_err(dev->dev, "tx urb submit failed:%d\n",
902 					err);
903 			break;
904 		}
905 		q->first = (q->first + 1) % q->ndesc;
906 	}
907 }
908 
mt76u_ac_to_hwq(struct mt76_dev * dev,u8 ac)909 static u8 mt76u_ac_to_hwq(struct mt76_dev *dev, u8 ac)
910 {
911 	if (mt76_chip(dev) == 0x7663) {
912 		static const u8 lmac_queue_map[] = {
913 			/* ac to lmac mapping */
914 			[IEEE80211_AC_BK] = 0,
915 			[IEEE80211_AC_BE] = 1,
916 			[IEEE80211_AC_VI] = 2,
917 			[IEEE80211_AC_VO] = 4,
918 		};
919 
920 		if (WARN_ON(ac >= ARRAY_SIZE(lmac_queue_map)))
921 			return 1; /* BE */
922 
923 		return lmac_queue_map[ac];
924 	}
925 
926 	return mt76_ac_to_hwq(ac);
927 }
928 
mt76u_alloc_tx(struct mt76_dev * dev)929 static int mt76u_alloc_tx(struct mt76_dev *dev)
930 {
931 	struct mt76_queue *q;
932 	int i, j, err;
933 
934 	for (i = 0; i <= MT_TXQ_PSD; i++) {
935 		if (i >= IEEE80211_NUM_ACS) {
936 			dev->phy.q_tx[i] = dev->phy.q_tx[0];
937 			continue;
938 		}
939 
940 		q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL);
941 		if (!q)
942 			return -ENOMEM;
943 
944 		spin_lock_init(&q->lock);
945 		q->hw_idx = mt76u_ac_to_hwq(dev, i);
946 
947 		dev->phy.q_tx[i] = q;
948 
949 		q->entry = devm_kcalloc(dev->dev,
950 					MT_NUM_TX_ENTRIES, sizeof(*q->entry),
951 					GFP_KERNEL);
952 		if (!q->entry)
953 			return -ENOMEM;
954 
955 		q->ndesc = MT_NUM_TX_ENTRIES;
956 		for (j = 0; j < q->ndesc; j++) {
957 			err = mt76u_urb_alloc(dev, &q->entry[j],
958 					      MT_TX_SG_MAX_SIZE);
959 			if (err < 0)
960 				return err;
961 		}
962 	}
963 	return 0;
964 }
965 
mt76u_free_tx(struct mt76_dev * dev)966 static void mt76u_free_tx(struct mt76_dev *dev)
967 {
968 	int i;
969 
970 	mt76_worker_teardown(&dev->usb.status_worker);
971 
972 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
973 		struct mt76_queue *q;
974 		int j;
975 
976 		q = dev->phy.q_tx[i];
977 		if (!q)
978 			continue;
979 
980 		for (j = 0; j < q->ndesc; j++) {
981 			usb_free_urb(q->entry[j].urb);
982 			q->entry[j].urb = NULL;
983 		}
984 	}
985 }
986 
mt76u_stop_tx(struct mt76_dev * dev)987 void mt76u_stop_tx(struct mt76_dev *dev)
988 {
989 	int ret;
990 
991 	mt76_worker_disable(&dev->usb.status_worker);
992 
993 	ret = wait_event_timeout(dev->tx_wait, !mt76_has_tx_pending(&dev->phy),
994 				 HZ / 5);
995 	if (!ret) {
996 		struct mt76_queue_entry entry;
997 		struct mt76_queue *q;
998 		int i, j;
999 
1000 		dev_err(dev->dev, "timed out waiting for pending tx\n");
1001 
1002 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1003 			q = dev->phy.q_tx[i];
1004 			if (!q)
1005 				continue;
1006 
1007 			for (j = 0; j < q->ndesc; j++)
1008 				usb_kill_urb(q->entry[j].urb);
1009 		}
1010 
1011 		mt76_worker_disable(&dev->tx_worker);
1012 
1013 		/* On device removal we maight queue skb's, but mt76u_tx_kick()
1014 		 * will fail to submit urb, cleanup those skb's manually.
1015 		 */
1016 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1017 			q = dev->phy.q_tx[i];
1018 			if (!q)
1019 				continue;
1020 
1021 			while (q->queued > 0) {
1022 				entry = q->entry[q->tail];
1023 				q->entry[q->tail].done = false;
1024 				mt76_queue_tx_complete(dev, q, &entry);
1025 			}
1026 		}
1027 
1028 		mt76_worker_enable(&dev->tx_worker);
1029 	}
1030 
1031 	cancel_work_sync(&dev->usb.stat_work);
1032 	clear_bit(MT76_READING_STATS, &dev->phy.state);
1033 
1034 	mt76_worker_enable(&dev->usb.status_worker);
1035 
1036 	mt76_tx_status_check(dev, true);
1037 }
1038 EXPORT_SYMBOL_GPL(mt76u_stop_tx);
1039 
mt76u_queues_deinit(struct mt76_dev * dev)1040 void mt76u_queues_deinit(struct mt76_dev *dev)
1041 {
1042 	mt76u_stop_rx(dev);
1043 	mt76u_stop_tx(dev);
1044 
1045 	mt76u_free_rx(dev);
1046 	mt76u_free_tx(dev);
1047 }
1048 EXPORT_SYMBOL_GPL(mt76u_queues_deinit);
1049 
mt76u_alloc_queues(struct mt76_dev * dev)1050 int mt76u_alloc_queues(struct mt76_dev *dev)
1051 {
1052 	int err;
1053 
1054 	err = mt76u_alloc_rx_queue(dev, MT_RXQ_MAIN);
1055 	if (err < 0)
1056 		return err;
1057 
1058 	return mt76u_alloc_tx(dev);
1059 }
1060 EXPORT_SYMBOL_GPL(mt76u_alloc_queues);
1061 
1062 static const struct mt76_queue_ops usb_queue_ops = {
1063 	.tx_queue_skb = mt76u_tx_queue_skb,
1064 	.kick = mt76u_tx_kick,
1065 };
1066 
__mt76u_init(struct mt76_dev * dev,struct usb_interface * intf,struct mt76_bus_ops * ops)1067 int __mt76u_init(struct mt76_dev *dev, struct usb_interface *intf,
1068 		 struct mt76_bus_ops *ops)
1069 {
1070 	struct usb_device *udev = interface_to_usbdev(intf);
1071 	struct mt76_usb *usb = &dev->usb;
1072 	int err;
1073 
1074 	INIT_WORK(&usb->stat_work, mt76u_tx_status_data);
1075 
1076 	usb->data_len = usb_maxpacket(udev, usb_sndctrlpipe(udev, 0));
1077 	if (usb->data_len < 32)
1078 		usb->data_len = 32;
1079 
1080 	usb->data = devm_kmalloc(dev->dev, usb->data_len, GFP_KERNEL);
1081 	if (!usb->data)
1082 		return -ENOMEM;
1083 
1084 	mutex_init(&usb->usb_ctrl_mtx);
1085 	dev->bus = ops;
1086 	dev->queue_ops = &usb_queue_ops;
1087 
1088 	dev_set_drvdata(&udev->dev, dev);
1089 
1090 	usb->sg_en = mt76u_check_sg(dev);
1091 
1092 	err = mt76u_set_endpoints(intf, usb);
1093 	if (err < 0)
1094 		return err;
1095 
1096 	err = mt76_worker_setup(dev->hw, &usb->rx_worker, mt76u_rx_worker,
1097 				"usb-rx");
1098 	if (err)
1099 		return err;
1100 
1101 	err = mt76_worker_setup(dev->hw, &usb->status_worker,
1102 				mt76u_status_worker, "usb-status");
1103 	if (err)
1104 		return err;
1105 
1106 	sched_set_fifo_low(usb->rx_worker.task);
1107 	sched_set_fifo_low(usb->status_worker.task);
1108 
1109 	return 0;
1110 }
1111 EXPORT_SYMBOL_GPL(__mt76u_init);
1112 
mt76u_init(struct mt76_dev * dev,struct usb_interface * intf)1113 int mt76u_init(struct mt76_dev *dev, struct usb_interface *intf)
1114 {
1115 	static struct mt76_bus_ops bus_ops = {
1116 		.rr = mt76u_rr,
1117 		.wr = mt76u_wr,
1118 		.rmw = mt76u_rmw,
1119 		.read_copy = mt76u_read_copy,
1120 		.write_copy = mt76u_copy,
1121 		.wr_rp = mt76u_wr_rp,
1122 		.rd_rp = mt76u_rd_rp,
1123 		.type = MT76_BUS_USB,
1124 	};
1125 
1126 	return __mt76u_init(dev, intf, &bus_ops);
1127 }
1128 EXPORT_SYMBOL_GPL(mt76u_init);
1129 
1130 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
1131 MODULE_LICENSE("Dual BSD/GPL");
1132