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18#include "dwc-xlgmac.h"
19#include "dwc-xlgmac-reg.h"
20
21static void xlgmac_unmap_desc_data(struct xlgmac_pdata *pdata,
22 struct xlgmac_desc_data *desc_data)
23{
24 if (desc_data->skb_dma) {
25 if (desc_data->mapped_as_page) {
26 dma_unmap_page(pdata->dev, desc_data->skb_dma,
27 desc_data->skb_dma_len, DMA_TO_DEVICE);
28 } else {
29 dma_unmap_single(pdata->dev, desc_data->skb_dma,
30 desc_data->skb_dma_len, DMA_TO_DEVICE);
31 }
32 desc_data->skb_dma = 0;
33 desc_data->skb_dma_len = 0;
34 }
35
36 if (desc_data->skb) {
37 dev_kfree_skb_any(desc_data->skb);
38 desc_data->skb = NULL;
39 }
40
41 if (desc_data->rx.hdr.pa.pages)
42 put_page(desc_data->rx.hdr.pa.pages);
43
44 if (desc_data->rx.hdr.pa_unmap.pages) {
45 dma_unmap_page(pdata->dev, desc_data->rx.hdr.pa_unmap.pages_dma,
46 desc_data->rx.hdr.pa_unmap.pages_len,
47 DMA_FROM_DEVICE);
48 put_page(desc_data->rx.hdr.pa_unmap.pages);
49 }
50
51 if (desc_data->rx.buf.pa.pages)
52 put_page(desc_data->rx.buf.pa.pages);
53
54 if (desc_data->rx.buf.pa_unmap.pages) {
55 dma_unmap_page(pdata->dev, desc_data->rx.buf.pa_unmap.pages_dma,
56 desc_data->rx.buf.pa_unmap.pages_len,
57 DMA_FROM_DEVICE);
58 put_page(desc_data->rx.buf.pa_unmap.pages);
59 }
60
61 memset(&desc_data->tx, 0, sizeof(desc_data->tx));
62 memset(&desc_data->rx, 0, sizeof(desc_data->rx));
63
64 desc_data->mapped_as_page = 0;
65
66 if (desc_data->state_saved) {
67 desc_data->state_saved = 0;
68 desc_data->state.skb = NULL;
69 desc_data->state.len = 0;
70 desc_data->state.error = 0;
71 }
72}
73
74static void xlgmac_free_ring(struct xlgmac_pdata *pdata,
75 struct xlgmac_ring *ring)
76{
77 struct xlgmac_desc_data *desc_data;
78 unsigned int i;
79
80 if (!ring)
81 return;
82
83 if (ring->desc_data_head) {
84 for (i = 0; i < ring->dma_desc_count; i++) {
85 desc_data = XLGMAC_GET_DESC_DATA(ring, i);
86 xlgmac_unmap_desc_data(pdata, desc_data);
87 }
88
89 kfree(ring->desc_data_head);
90 ring->desc_data_head = NULL;
91 }
92
93 if (ring->rx_hdr_pa.pages) {
94 dma_unmap_page(pdata->dev, ring->rx_hdr_pa.pages_dma,
95 ring->rx_hdr_pa.pages_len, DMA_FROM_DEVICE);
96 put_page(ring->rx_hdr_pa.pages);
97
98 ring->rx_hdr_pa.pages = NULL;
99 ring->rx_hdr_pa.pages_len = 0;
100 ring->rx_hdr_pa.pages_offset = 0;
101 ring->rx_hdr_pa.pages_dma = 0;
102 }
103
104 if (ring->rx_buf_pa.pages) {
105 dma_unmap_page(pdata->dev, ring->rx_buf_pa.pages_dma,
106 ring->rx_buf_pa.pages_len, DMA_FROM_DEVICE);
107 put_page(ring->rx_buf_pa.pages);
108
109 ring->rx_buf_pa.pages = NULL;
110 ring->rx_buf_pa.pages_len = 0;
111 ring->rx_buf_pa.pages_offset = 0;
112 ring->rx_buf_pa.pages_dma = 0;
113 }
114
115 if (ring->dma_desc_head) {
116 dma_free_coherent(pdata->dev,
117 (sizeof(struct xlgmac_dma_desc) *
118 ring->dma_desc_count),
119 ring->dma_desc_head,
120 ring->dma_desc_head_addr);
121 ring->dma_desc_head = NULL;
122 }
123}
124
125static int xlgmac_init_ring(struct xlgmac_pdata *pdata,
126 struct xlgmac_ring *ring,
127 unsigned int dma_desc_count)
128{
129 if (!ring)
130 return 0;
131
132
133 ring->dma_desc_count = dma_desc_count;
134 ring->dma_desc_head = dma_alloc_coherent(pdata->dev,
135 (sizeof(struct xlgmac_dma_desc) *
136 dma_desc_count),
137 &ring->dma_desc_head_addr,
138 GFP_KERNEL);
139 if (!ring->dma_desc_head)
140 return -ENOMEM;
141
142
143 ring->desc_data_head = kcalloc(dma_desc_count,
144 sizeof(struct xlgmac_desc_data),
145 GFP_KERNEL);
146 if (!ring->desc_data_head)
147 return -ENOMEM;
148
149 netif_dbg(pdata, drv, pdata->netdev,
150 "dma_desc_head=%p, dma_desc_head_addr=%pad, desc_data_head=%p\n",
151 ring->dma_desc_head,
152 &ring->dma_desc_head_addr,
153 ring->desc_data_head);
154
155 return 0;
156}
157
158static void xlgmac_free_rings(struct xlgmac_pdata *pdata)
159{
160 struct xlgmac_channel *channel;
161 unsigned int i;
162
163 if (!pdata->channel_head)
164 return;
165
166 channel = pdata->channel_head;
167 for (i = 0; i < pdata->channel_count; i++, channel++) {
168 xlgmac_free_ring(pdata, channel->tx_ring);
169 xlgmac_free_ring(pdata, channel->rx_ring);
170 }
171}
172
173static int xlgmac_alloc_rings(struct xlgmac_pdata *pdata)
174{
175 struct xlgmac_channel *channel;
176 unsigned int i;
177 int ret;
178
179 channel = pdata->channel_head;
180 for (i = 0; i < pdata->channel_count; i++, channel++) {
181 netif_dbg(pdata, drv, pdata->netdev, "%s - Tx ring:\n",
182 channel->name);
183
184 ret = xlgmac_init_ring(pdata, channel->tx_ring,
185 pdata->tx_desc_count);
186
187 if (ret) {
188 netdev_alert(pdata->netdev,
189 "error initializing Tx ring");
190 goto err_init_ring;
191 }
192
193 netif_dbg(pdata, drv, pdata->netdev, "%s - Rx ring:\n",
194 channel->name);
195
196 ret = xlgmac_init_ring(pdata, channel->rx_ring,
197 pdata->rx_desc_count);
198 if (ret) {
199 netdev_alert(pdata->netdev,
200 "error initializing Rx ring\n");
201 goto err_init_ring;
202 }
203 }
204
205 return 0;
206
207err_init_ring:
208 xlgmac_free_rings(pdata);
209
210 return ret;
211}
212
213static void xlgmac_free_channels(struct xlgmac_pdata *pdata)
214{
215 if (!pdata->channel_head)
216 return;
217
218 kfree(pdata->channel_head->tx_ring);
219 pdata->channel_head->tx_ring = NULL;
220
221 kfree(pdata->channel_head->rx_ring);
222 pdata->channel_head->rx_ring = NULL;
223
224 kfree(pdata->channel_head);
225
226 pdata->channel_head = NULL;
227 pdata->channel_count = 0;
228}
229
230static int xlgmac_alloc_channels(struct xlgmac_pdata *pdata)
231{
232 struct xlgmac_channel *channel_head, *channel;
233 struct xlgmac_ring *tx_ring, *rx_ring;
234 int ret = -ENOMEM;
235 unsigned int i;
236
237 channel_head = kcalloc(pdata->channel_count,
238 sizeof(struct xlgmac_channel), GFP_KERNEL);
239 if (!channel_head)
240 return ret;
241
242 netif_dbg(pdata, drv, pdata->netdev,
243 "channel_head=%p\n", channel_head);
244
245 tx_ring = kcalloc(pdata->tx_ring_count, sizeof(struct xlgmac_ring),
246 GFP_KERNEL);
247 if (!tx_ring)
248 goto err_tx_ring;
249
250 rx_ring = kcalloc(pdata->rx_ring_count, sizeof(struct xlgmac_ring),
251 GFP_KERNEL);
252 if (!rx_ring)
253 goto err_rx_ring;
254
255 for (i = 0, channel = channel_head; i < pdata->channel_count;
256 i++, channel++) {
257 snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
258 channel->pdata = pdata;
259 channel->queue_index = i;
260 channel->dma_regs = pdata->mac_regs + DMA_CH_BASE +
261 (DMA_CH_INC * i);
262
263 if (pdata->per_channel_irq) {
264
265 ret = pdata->channel_irq[i];
266 if (ret < 0) {
267 netdev_err(pdata->netdev,
268 "get_irq %u failed\n",
269 i + 1);
270 goto err_irq;
271 }
272 channel->dma_irq = ret;
273 }
274
275 if (i < pdata->tx_ring_count)
276 channel->tx_ring = tx_ring++;
277
278 if (i < pdata->rx_ring_count)
279 channel->rx_ring = rx_ring++;
280
281 netif_dbg(pdata, drv, pdata->netdev,
282 "%s: dma_regs=%p, tx_ring=%p, rx_ring=%p\n",
283 channel->name, channel->dma_regs,
284 channel->tx_ring, channel->rx_ring);
285 }
286
287 pdata->channel_head = channel_head;
288
289 return 0;
290
291err_irq:
292 kfree(rx_ring);
293
294err_rx_ring:
295 kfree(tx_ring);
296
297err_tx_ring:
298 kfree(channel_head);
299
300 return ret;
301}
302
303static void xlgmac_free_channels_and_rings(struct xlgmac_pdata *pdata)
304{
305 xlgmac_free_rings(pdata);
306
307 xlgmac_free_channels(pdata);
308}
309
310static int xlgmac_alloc_channels_and_rings(struct xlgmac_pdata *pdata)
311{
312 int ret;
313
314 ret = xlgmac_alloc_channels(pdata);
315 if (ret)
316 goto err_alloc;
317
318 ret = xlgmac_alloc_rings(pdata);
319 if (ret)
320 goto err_alloc;
321
322 return 0;
323
324err_alloc:
325 xlgmac_free_channels_and_rings(pdata);
326
327 return ret;
328}
329
330static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
331 struct xlgmac_page_alloc *pa,
332 gfp_t gfp, int order)
333{
334 struct page *pages = NULL;
335 dma_addr_t pages_dma;
336
337
338 gfp |= __GFP_COMP | __GFP_NOWARN;
339 while (order >= 0) {
340 pages = alloc_pages(gfp, order);
341 if (pages)
342 break;
343
344 order--;
345 }
346 if (!pages)
347 return -ENOMEM;
348
349
350 pages_dma = dma_map_page(pdata->dev, pages, 0,
351 PAGE_SIZE << order, DMA_FROM_DEVICE);
352 if (dma_mapping_error(pdata->dev, pages_dma)) {
353 put_page(pages);
354 return -ENOMEM;
355 }
356
357 pa->pages = pages;
358 pa->pages_len = PAGE_SIZE << order;
359 pa->pages_offset = 0;
360 pa->pages_dma = pages_dma;
361
362 return 0;
363}
364
365static void xlgmac_set_buffer_data(struct xlgmac_buffer_data *bd,
366 struct xlgmac_page_alloc *pa,
367 unsigned int len)
368{
369 get_page(pa->pages);
370 bd->pa = *pa;
371
372 bd->dma_base = pa->pages_dma;
373 bd->dma_off = pa->pages_offset;
374 bd->dma_len = len;
375
376 pa->pages_offset += len;
377 if ((pa->pages_offset + len) > pa->pages_len) {
378
379 bd->pa_unmap = *pa;
380
381
382 pa->pages = NULL;
383 pa->pages_len = 0;
384 pa->pages_offset = 0;
385 pa->pages_dma = 0;
386 }
387}
388
389static int xlgmac_map_rx_buffer(struct xlgmac_pdata *pdata,
390 struct xlgmac_ring *ring,
391 struct xlgmac_desc_data *desc_data)
392{
393 int order, ret;
394
395 if (!ring->rx_hdr_pa.pages) {
396 ret = xlgmac_alloc_pages(pdata, &ring->rx_hdr_pa,
397 GFP_ATOMIC, 0);
398 if (ret)
399 return ret;
400 }
401
402 if (!ring->rx_buf_pa.pages) {
403 order = max_t(int, PAGE_ALLOC_COSTLY_ORDER - 1, 0);
404 ret = xlgmac_alloc_pages(pdata, &ring->rx_buf_pa,
405 GFP_ATOMIC, order);
406 if (ret)
407 return ret;
408 }
409
410
411 xlgmac_set_buffer_data(&desc_data->rx.hdr, &ring->rx_hdr_pa,
412 XLGMAC_SKB_ALLOC_SIZE);
413
414
415 xlgmac_set_buffer_data(&desc_data->rx.buf, &ring->rx_buf_pa,
416 pdata->rx_buf_size);
417
418 return 0;
419}
420
421static void xlgmac_tx_desc_init(struct xlgmac_pdata *pdata)
422{
423 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
424 struct xlgmac_desc_data *desc_data;
425 struct xlgmac_dma_desc *dma_desc;
426 struct xlgmac_channel *channel;
427 struct xlgmac_ring *ring;
428 dma_addr_t dma_desc_addr;
429 unsigned int i, j;
430
431 channel = pdata->channel_head;
432 for (i = 0; i < pdata->channel_count; i++, channel++) {
433 ring = channel->tx_ring;
434 if (!ring)
435 break;
436
437 dma_desc = ring->dma_desc_head;
438 dma_desc_addr = ring->dma_desc_head_addr;
439
440 for (j = 0; j < ring->dma_desc_count; j++) {
441 desc_data = XLGMAC_GET_DESC_DATA(ring, j);
442
443 desc_data->dma_desc = dma_desc;
444 desc_data->dma_desc_addr = dma_desc_addr;
445
446 dma_desc++;
447 dma_desc_addr += sizeof(struct xlgmac_dma_desc);
448 }
449
450 ring->cur = 0;
451 ring->dirty = 0;
452 memset(&ring->tx, 0, sizeof(ring->tx));
453
454 hw_ops->tx_desc_init(channel);
455 }
456}
457
458static void xlgmac_rx_desc_init(struct xlgmac_pdata *pdata)
459{
460 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
461 struct xlgmac_desc_data *desc_data;
462 struct xlgmac_dma_desc *dma_desc;
463 struct xlgmac_channel *channel;
464 struct xlgmac_ring *ring;
465 dma_addr_t dma_desc_addr;
466 unsigned int i, j;
467
468 channel = pdata->channel_head;
469 for (i = 0; i < pdata->channel_count; i++, channel++) {
470 ring = channel->rx_ring;
471 if (!ring)
472 break;
473
474 dma_desc = ring->dma_desc_head;
475 dma_desc_addr = ring->dma_desc_head_addr;
476
477 for (j = 0; j < ring->dma_desc_count; j++) {
478 desc_data = XLGMAC_GET_DESC_DATA(ring, j);
479
480 desc_data->dma_desc = dma_desc;
481 desc_data->dma_desc_addr = dma_desc_addr;
482
483 if (xlgmac_map_rx_buffer(pdata, ring, desc_data))
484 break;
485
486 dma_desc++;
487 dma_desc_addr += sizeof(struct xlgmac_dma_desc);
488 }
489
490 ring->cur = 0;
491 ring->dirty = 0;
492
493 hw_ops->rx_desc_init(channel);
494 }
495}
496
497static int xlgmac_map_tx_skb(struct xlgmac_channel *channel,
498 struct sk_buff *skb)
499{
500 struct xlgmac_pdata *pdata = channel->pdata;
501 struct xlgmac_ring *ring = channel->tx_ring;
502 unsigned int start_index, cur_index;
503 struct xlgmac_desc_data *desc_data;
504 unsigned int offset, datalen, len;
505 struct xlgmac_pkt_info *pkt_info;
506 skb_frag_t *frag;
507 unsigned int tso, vlan;
508 dma_addr_t skb_dma;
509 unsigned int i;
510
511 offset = 0;
512 start_index = ring->cur;
513 cur_index = ring->cur;
514
515 pkt_info = &ring->pkt_info;
516 pkt_info->desc_count = 0;
517 pkt_info->length = 0;
518
519 tso = XLGMAC_GET_REG_BITS(pkt_info->attributes,
520 TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS,
521 TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN);
522 vlan = XLGMAC_GET_REG_BITS(pkt_info->attributes,
523 TX_PACKET_ATTRIBUTES_VLAN_CTAG_POS,
524 TX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN);
525
526
527 if ((tso && (pkt_info->mss != ring->tx.cur_mss)) ||
528 (vlan && (pkt_info->vlan_ctag != ring->tx.cur_vlan_ctag)))
529 cur_index++;
530 desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
531
532 if (tso) {
533
534 skb_dma = dma_map_single(pdata->dev, skb->data,
535 pkt_info->header_len, DMA_TO_DEVICE);
536 if (dma_mapping_error(pdata->dev, skb_dma)) {
537 netdev_alert(pdata->netdev, "dma_map_single failed\n");
538 goto err_out;
539 }
540 desc_data->skb_dma = skb_dma;
541 desc_data->skb_dma_len = pkt_info->header_len;
542 netif_dbg(pdata, tx_queued, pdata->netdev,
543 "skb header: index=%u, dma=%pad, len=%u\n",
544 cur_index, &skb_dma, pkt_info->header_len);
545
546 offset = pkt_info->header_len;
547
548 pkt_info->length += pkt_info->header_len;
549
550 cur_index++;
551 desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
552 }
553
554
555 for (datalen = skb_headlen(skb) - offset; datalen; ) {
556 len = min_t(unsigned int, datalen, XLGMAC_TX_MAX_BUF_SIZE);
557
558 skb_dma = dma_map_single(pdata->dev, skb->data + offset, len,
559 DMA_TO_DEVICE);
560 if (dma_mapping_error(pdata->dev, skb_dma)) {
561 netdev_alert(pdata->netdev, "dma_map_single failed\n");
562 goto err_out;
563 }
564 desc_data->skb_dma = skb_dma;
565 desc_data->skb_dma_len = len;
566 netif_dbg(pdata, tx_queued, pdata->netdev,
567 "skb data: index=%u, dma=%pad, len=%u\n",
568 cur_index, &skb_dma, len);
569
570 datalen -= len;
571 offset += len;
572
573 pkt_info->length += len;
574
575 cur_index++;
576 desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
577 }
578
579 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
580 netif_dbg(pdata, tx_queued, pdata->netdev,
581 "mapping frag %u\n", i);
582
583 frag = &skb_shinfo(skb)->frags[i];
584 offset = 0;
585
586 for (datalen = skb_frag_size(frag); datalen; ) {
587 len = min_t(unsigned int, datalen,
588 XLGMAC_TX_MAX_BUF_SIZE);
589
590 skb_dma = skb_frag_dma_map(pdata->dev, frag, offset,
591 len, DMA_TO_DEVICE);
592 if (dma_mapping_error(pdata->dev, skb_dma)) {
593 netdev_alert(pdata->netdev,
594 "skb_frag_dma_map failed\n");
595 goto err_out;
596 }
597 desc_data->skb_dma = skb_dma;
598 desc_data->skb_dma_len = len;
599 desc_data->mapped_as_page = 1;
600 netif_dbg(pdata, tx_queued, pdata->netdev,
601 "skb frag: index=%u, dma=%pad, len=%u\n",
602 cur_index, &skb_dma, len);
603
604 datalen -= len;
605 offset += len;
606
607 pkt_info->length += len;
608
609 cur_index++;
610 desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
611 }
612 }
613
614
615
616
617
618 desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index - 1);
619 desc_data->skb = skb;
620
621
622 pkt_info->desc_count = cur_index - start_index;
623
624 return pkt_info->desc_count;
625
626err_out:
627 while (start_index < cur_index) {
628 desc_data = XLGMAC_GET_DESC_DATA(ring, start_index++);
629 xlgmac_unmap_desc_data(pdata, desc_data);
630 }
631
632 return 0;
633}
634
635void xlgmac_init_desc_ops(struct xlgmac_desc_ops *desc_ops)
636{
637 desc_ops->alloc_channels_and_rings = xlgmac_alloc_channels_and_rings;
638 desc_ops->free_channels_and_rings = xlgmac_free_channels_and_rings;
639 desc_ops->map_tx_skb = xlgmac_map_tx_skb;
640 desc_ops->map_rx_buffer = xlgmac_map_rx_buffer;
641 desc_ops->unmap_desc_data = xlgmac_unmap_desc_data;
642 desc_ops->tx_desc_init = xlgmac_tx_desc_init;
643 desc_ops->rx_desc_init = xlgmac_rx_desc_init;
644}
645
