1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
11 static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
12 struct mt7601u_dma_buf_rx *e, gfp_t gfp);
14 static unsigned int ieee80211_get_hdrlen_from_buf(const u8 *data, unsigned len)
16 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)data;
19 if (unlikely(len < 10))
21 hdrlen = ieee80211_hdrlen(hdr->frame_control);
22 if (unlikely(hdrlen > len))
27 static struct sk_buff *
28 mt7601u_rx_skb_from_seg(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi,
29 void *data, u32 seg_len, u32 truesize, struct page *p)
32 u32 true_len, hdr_len = 0, copy, frag;
34 skb = alloc_skb(p ? 128 : seg_len, GFP_ATOMIC);
38 true_len = mt76_mac_process_rx(dev, skb, data, rxwi);
39 if (!true_len || true_len > seg_len)
42 hdr_len = ieee80211_get_hdrlen_from_buf(data, true_len);
46 if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_L2PAD)) {
47 skb_put_data(skb, data, hdr_len);
54 /* If not doing paged RX allocated skb will always have enough space */
55 copy = (true_len <= skb_tailroom(skb)) ? true_len : hdr_len + 8;
56 frag = true_len - copy;
58 skb_put_data(skb, data, copy);
62 skb_add_rx_frag(skb, 0, p, data - page_address(p),
70 dev_err_ratelimited(dev->dev, "Error: incorrect frame len:%u hdr:%u\n",
76 static void mt7601u_rx_process_seg(struct mt7601u_dev *dev, u8 *data,
77 u32 seg_len, struct page *p)
80 struct mt7601u_rxwi *rxwi;
81 u32 fce_info, truesize = seg_len;
83 /* DMA_INFO field at the beginning of the segment contains only some of
84 * the information, we need to read the FCE descriptor from the end.
86 fce_info = get_unaligned_le32(data + seg_len - MT_FCE_INFO_LEN);
87 seg_len -= MT_FCE_INFO_LEN;
89 data += MT_DMA_HDR_LEN;
90 seg_len -= MT_DMA_HDR_LEN;
92 rxwi = (struct mt7601u_rxwi *) data;
93 data += sizeof(struct mt7601u_rxwi);
94 seg_len -= sizeof(struct mt7601u_rxwi);
96 if (unlikely(rxwi->zero[0] || rxwi->zero[1] || rxwi->zero[2]))
97 dev_err_once(dev->dev, "Error: RXWI zero fields are set\n");
98 if (unlikely(FIELD_GET(MT_RXD_INFO_TYPE, fce_info)))
99 dev_err_once(dev->dev, "Error: RX path seen a non-pkt urb\n");
101 trace_mt_rx(dev, rxwi, fce_info);
103 skb = mt7601u_rx_skb_from_seg(dev, rxwi, data, seg_len, truesize, p);
107 spin_lock(&dev->mac_lock);
108 ieee80211_rx(dev->hw, skb);
109 spin_unlock(&dev->mac_lock);
112 static u16 mt7601u_rx_next_seg_len(u8 *data, u32 data_len)
114 u32 min_seg_len = MT_DMA_HDR_LEN + MT_RX_INFO_LEN +
115 sizeof(struct mt7601u_rxwi) + MT_FCE_INFO_LEN;
116 u16 dma_len = get_unaligned_le16(data);
118 if (data_len < min_seg_len ||
119 WARN_ON_ONCE(!dma_len) ||
120 WARN_ON_ONCE(dma_len + MT_DMA_HDRS > data_len) ||
121 WARN_ON_ONCE(dma_len & 0x3))
124 return MT_DMA_HDRS + dma_len;
128 mt7601u_rx_process_entry(struct mt7601u_dev *dev, struct mt7601u_dma_buf_rx *e)
130 u32 seg_len, data_len = e->urb->actual_length;
131 u8 *data = page_address(e->p);
132 struct page *new_p = NULL;
135 if (!test_bit(MT7601U_STATE_INITIALIZED, &dev->state))
138 /* Copy if there is very little data in the buffer. */
140 new_p = dev_alloc_pages(MT_RX_ORDER);
142 while ((seg_len = mt7601u_rx_next_seg_len(data, data_len))) {
143 mt7601u_rx_process_seg(dev, data, seg_len, new_p ? e->p : NULL);
151 trace_mt_rx_dma_aggr(dev, cnt, !!new_p);
154 /* we have one extra ref from the allocator */
155 __free_pages(e->p, MT_RX_ORDER);
161 static struct mt7601u_dma_buf_rx *
162 mt7601u_rx_get_pending_entry(struct mt7601u_dev *dev)
164 struct mt7601u_rx_queue *q = &dev->rx_q;
165 struct mt7601u_dma_buf_rx *buf = NULL;
168 spin_lock_irqsave(&dev->rx_lock, flags);
173 buf = &q->e[q->start];
175 q->start = (q->start + 1) % q->entries;
177 spin_unlock_irqrestore(&dev->rx_lock, flags);
182 static void mt7601u_complete_rx(struct urb *urb)
184 struct mt7601u_dev *dev = urb->context;
185 struct mt7601u_rx_queue *q = &dev->rx_q;
188 /* do no schedule rx tasklet if urb has been unlinked
189 * or the device has been removed
191 switch (urb->status) {
197 dev_err_ratelimited(dev->dev, "rx urb failed: %d\n",
204 spin_lock_irqsave(&dev->rx_lock, flags);
205 if (WARN_ONCE(q->e[q->end].urb != urb, "RX urb mismatch"))
208 q->end = (q->end + 1) % q->entries;
210 tasklet_schedule(&dev->rx_tasklet);
212 spin_unlock_irqrestore(&dev->rx_lock, flags);
215 static void mt7601u_rx_tasklet(unsigned long data)
217 struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
218 struct mt7601u_dma_buf_rx *e;
220 while ((e = mt7601u_rx_get_pending_entry(dev))) {
224 mt7601u_rx_process_entry(dev, e);
225 mt7601u_submit_rx_buf(dev, e, GFP_ATOMIC);
229 static void mt7601u_complete_tx(struct urb *urb)
231 struct mt7601u_tx_queue *q = urb->context;
232 struct mt7601u_dev *dev = q->dev;
236 switch (urb->status) {
242 dev_err_ratelimited(dev->dev, "tx urb failed: %d\n",
249 spin_lock_irqsave(&dev->tx_lock, flags);
250 if (WARN_ONCE(q->e[q->start].urb != urb, "TX urb mismatch"))
253 skb = q->e[q->start].skb;
254 q->e[q->start].skb = NULL;
255 trace_mt_tx_dma_done(dev, skb);
257 __skb_queue_tail(&dev->tx_skb_done, skb);
258 tasklet_schedule(&dev->tx_tasklet);
260 if (q->used == q->entries - q->entries / 8)
261 ieee80211_wake_queue(dev->hw, skb_get_queue_mapping(skb));
263 q->start = (q->start + 1) % q->entries;
266 spin_unlock_irqrestore(&dev->tx_lock, flags);
269 static void mt7601u_tx_tasklet(unsigned long data)
271 struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
272 struct sk_buff_head skbs;
275 __skb_queue_head_init(&skbs);
277 spin_lock_irqsave(&dev->tx_lock, flags);
279 set_bit(MT7601U_STATE_MORE_STATS, &dev->state);
280 if (!test_and_set_bit(MT7601U_STATE_READING_STATS, &dev->state))
281 queue_delayed_work(dev->stat_wq, &dev->stat_work,
282 msecs_to_jiffies(10));
284 skb_queue_splice_init(&dev->tx_skb_done, &skbs);
286 spin_unlock_irqrestore(&dev->tx_lock, flags);
288 while (!skb_queue_empty(&skbs)) {
289 struct sk_buff *skb = __skb_dequeue(&skbs);
291 mt7601u_tx_status(dev, skb);
295 static int mt7601u_dma_submit_tx(struct mt7601u_dev *dev,
296 struct sk_buff *skb, u8 ep)
298 struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
299 unsigned snd_pipe = usb_sndbulkpipe(usb_dev, dev->out_eps[ep]);
300 struct mt7601u_dma_buf_tx *e;
301 struct mt7601u_tx_queue *q = &dev->tx_q[ep];
305 spin_lock_irqsave(&dev->tx_lock, flags);
307 if (WARN_ON(q->entries <= q->used)) {
314 usb_fill_bulk_urb(e->urb, usb_dev, snd_pipe, skb->data, skb->len,
315 mt7601u_complete_tx, q);
316 ret = usb_submit_urb(e->urb, GFP_ATOMIC);
318 /* Special-handle ENODEV from TX urb submission because it will
319 * often be the first ENODEV we see after device is removed.
322 set_bit(MT7601U_STATE_REMOVED, &dev->state);
324 dev_err(dev->dev, "Error: TX urb submit failed:%d\n",
329 q->end = (q->end + 1) % q->entries;
332 if (q->used >= q->entries)
333 ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
335 spin_unlock_irqrestore(&dev->tx_lock, flags);
340 /* Map hardware Q to USB endpoint number */
341 static u8 q2ep(u8 qid)
343 /* TODO: take management packets to queue 5 */
347 /* Map USB endpoint number to Q id in the DMA engine */
348 static enum mt76_qsel ep2dmaq(u8 ep)
355 int mt7601u_dma_enqueue_tx(struct mt7601u_dev *dev, struct sk_buff *skb,
356 struct mt76_wcid *wcid, int hw_q)
362 dma_flags = MT_TXD_PKT_INFO_80211;
363 if (wcid->hw_key_idx == 0xff)
364 dma_flags |= MT_TXD_PKT_INFO_WIV;
366 ret = mt7601u_dma_skb_wrap_pkt(skb, ep2dmaq(ep), dma_flags);
370 ret = mt7601u_dma_submit_tx(dev, skb, ep);
372 ieee80211_free_txskb(dev->hw, skb);
379 static void mt7601u_kill_rx(struct mt7601u_dev *dev)
383 for (i = 0; i < dev->rx_q.entries; i++)
384 usb_poison_urb(dev->rx_q.e[i].urb);
387 static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
388 struct mt7601u_dma_buf_rx *e, gfp_t gfp)
390 struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
391 u8 *buf = page_address(e->p);
395 pipe = usb_rcvbulkpipe(usb_dev, dev->in_eps[MT_EP_IN_PKT_RX]);
397 usb_fill_bulk_urb(e->urb, usb_dev, pipe, buf, MT_RX_URB_SIZE,
398 mt7601u_complete_rx, dev);
400 trace_mt_submit_urb(dev, e->urb);
401 ret = usb_submit_urb(e->urb, gfp);
403 dev_err(dev->dev, "Error: submit RX URB failed:%d\n", ret);
408 static int mt7601u_submit_rx(struct mt7601u_dev *dev)
412 for (i = 0; i < dev->rx_q.entries; i++) {
413 ret = mt7601u_submit_rx_buf(dev, &dev->rx_q.e[i], GFP_KERNEL);
421 static void mt7601u_free_rx(struct mt7601u_dev *dev)
425 for (i = 0; i < dev->rx_q.entries; i++) {
426 __free_pages(dev->rx_q.e[i].p, MT_RX_ORDER);
427 usb_free_urb(dev->rx_q.e[i].urb);
431 static int mt7601u_alloc_rx(struct mt7601u_dev *dev)
435 memset(&dev->rx_q, 0, sizeof(dev->rx_q));
437 dev->rx_q.entries = N_RX_ENTRIES;
439 for (i = 0; i < N_RX_ENTRIES; i++) {
440 dev->rx_q.e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
441 dev->rx_q.e[i].p = dev_alloc_pages(MT_RX_ORDER);
443 if (!dev->rx_q.e[i].urb || !dev->rx_q.e[i].p)
450 static void mt7601u_free_tx_queue(struct mt7601u_tx_queue *q)
454 for (i = 0; i < q->entries; i++) {
455 usb_poison_urb(q->e[i].urb);
457 mt7601u_tx_status(q->dev, q->e[i].skb);
458 usb_free_urb(q->e[i].urb);
462 static void mt7601u_free_tx(struct mt7601u_dev *dev)
469 for (i = 0; i < __MT_EP_OUT_MAX; i++)
470 mt7601u_free_tx_queue(&dev->tx_q[i]);
473 static int mt7601u_alloc_tx_queue(struct mt7601u_dev *dev,
474 struct mt7601u_tx_queue *q)
479 q->entries = N_TX_ENTRIES;
481 for (i = 0; i < N_TX_ENTRIES; i++) {
482 q->e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
490 static int mt7601u_alloc_tx(struct mt7601u_dev *dev)
494 dev->tx_q = devm_kcalloc(dev->dev, __MT_EP_OUT_MAX,
495 sizeof(*dev->tx_q), GFP_KERNEL);
499 for (i = 0; i < __MT_EP_OUT_MAX; i++)
500 if (mt7601u_alloc_tx_queue(dev, &dev->tx_q[i]))
506 int mt7601u_dma_init(struct mt7601u_dev *dev)
510 tasklet_init(&dev->tx_tasklet, mt7601u_tx_tasklet, (unsigned long) dev);
511 tasklet_init(&dev->rx_tasklet, mt7601u_rx_tasklet, (unsigned long) dev);
513 ret = mt7601u_alloc_tx(dev);
516 ret = mt7601u_alloc_rx(dev);
520 ret = mt7601u_submit_rx(dev);
526 mt7601u_dma_cleanup(dev);
530 void mt7601u_dma_cleanup(struct mt7601u_dev *dev)
532 mt7601u_kill_rx(dev);
534 tasklet_kill(&dev->rx_tasklet);
536 mt7601u_free_rx(dev);
537 mt7601u_free_tx(dev);
539 tasklet_kill(&dev->tx_tasklet);