1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Atlantic Network Driver
3 *
4 * Copyright (C) 2014-2019 aQuantia Corporation
5 * Copyright (C) 2019-2020 Marvell International Ltd.
6 */
7
8 /* File aq_ring.c: Definition of functions for Rx/Tx rings. */
9
10 #include "aq_ring.h"
11 #include "aq_nic.h"
12 #include "aq_hw.h"
13 #include "aq_hw_utils.h"
14 #include "aq_ptp.h"
15
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18
aq_free_rxpage(struct aq_rxpage * rxpage,struct device * dev)19 static inline void aq_free_rxpage(struct aq_rxpage *rxpage, struct device *dev)
20 {
21 unsigned int len = PAGE_SIZE << rxpage->order;
22
23 dma_unmap_page(dev, rxpage->daddr, len, DMA_FROM_DEVICE);
24
25 /* Drop the ref for being in the ring. */
26 __free_pages(rxpage->page, rxpage->order);
27 rxpage->page = NULL;
28 }
29
aq_get_rxpage(struct aq_rxpage * rxpage,unsigned int order,struct device * dev)30 static int aq_get_rxpage(struct aq_rxpage *rxpage, unsigned int order,
31 struct device *dev)
32 {
33 struct page *page;
34 int ret = -ENOMEM;
35 dma_addr_t daddr;
36
37 page = dev_alloc_pages(order);
38 if (unlikely(!page))
39 goto err_exit;
40
41 daddr = dma_map_page(dev, page, 0, PAGE_SIZE << order,
42 DMA_FROM_DEVICE);
43
44 if (unlikely(dma_mapping_error(dev, daddr)))
45 goto free_page;
46
47 rxpage->page = page;
48 rxpage->daddr = daddr;
49 rxpage->order = order;
50 rxpage->pg_off = 0;
51
52 return 0;
53
54 free_page:
55 __free_pages(page, order);
56
57 err_exit:
58 return ret;
59 }
60
aq_get_rxpages(struct aq_ring_s * self,struct aq_ring_buff_s * rxbuf,int order)61 static int aq_get_rxpages(struct aq_ring_s *self, struct aq_ring_buff_s *rxbuf,
62 int order)
63 {
64 int ret;
65
66 if (rxbuf->rxdata.page) {
67 /* One means ring is the only user and can reuse */
68 if (page_ref_count(rxbuf->rxdata.page) > 1) {
69 /* Try reuse buffer */
70 rxbuf->rxdata.pg_off += AQ_CFG_RX_FRAME_MAX;
71 if (rxbuf->rxdata.pg_off + AQ_CFG_RX_FRAME_MAX <=
72 (PAGE_SIZE << order)) {
73 u64_stats_update_begin(&self->stats.rx.syncp);
74 self->stats.rx.pg_flips++;
75 u64_stats_update_end(&self->stats.rx.syncp);
76 } else {
77 /* Buffer exhausted. We have other users and
78 * should release this page and realloc
79 */
80 aq_free_rxpage(&rxbuf->rxdata,
81 aq_nic_get_dev(self->aq_nic));
82 u64_stats_update_begin(&self->stats.rx.syncp);
83 self->stats.rx.pg_losts++;
84 u64_stats_update_end(&self->stats.rx.syncp);
85 }
86 } else {
87 rxbuf->rxdata.pg_off = 0;
88 u64_stats_update_begin(&self->stats.rx.syncp);
89 self->stats.rx.pg_reuses++;
90 u64_stats_update_end(&self->stats.rx.syncp);
91 }
92 }
93
94 if (!rxbuf->rxdata.page) {
95 ret = aq_get_rxpage(&rxbuf->rxdata, order,
96 aq_nic_get_dev(self->aq_nic));
97 if (ret) {
98 u64_stats_update_begin(&self->stats.rx.syncp);
99 self->stats.rx.alloc_fails++;
100 u64_stats_update_end(&self->stats.rx.syncp);
101 }
102 return ret;
103 }
104
105 return 0;
106 }
107
aq_ring_alloc(struct aq_ring_s * self,struct aq_nic_s * aq_nic)108 static struct aq_ring_s *aq_ring_alloc(struct aq_ring_s *self,
109 struct aq_nic_s *aq_nic)
110 {
111 int err = 0;
112
113 self->buff_ring =
114 kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);
115
116 if (!self->buff_ring) {
117 err = -ENOMEM;
118 goto err_exit;
119 }
120 self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
121 self->size * self->dx_size,
122 &self->dx_ring_pa, GFP_KERNEL);
123 if (!self->dx_ring) {
124 err = -ENOMEM;
125 goto err_exit;
126 }
127
128 err_exit:
129 if (err < 0) {
130 aq_ring_free(self);
131 self = NULL;
132 }
133
134 return self;
135 }
136
aq_ring_tx_alloc(struct aq_ring_s * self,struct aq_nic_s * aq_nic,unsigned int idx,struct aq_nic_cfg_s * aq_nic_cfg)137 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
138 struct aq_nic_s *aq_nic,
139 unsigned int idx,
140 struct aq_nic_cfg_s *aq_nic_cfg)
141 {
142 int err = 0;
143
144 self->aq_nic = aq_nic;
145 self->idx = idx;
146 self->size = aq_nic_cfg->txds;
147 self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;
148
149 self = aq_ring_alloc(self, aq_nic);
150 if (!self) {
151 err = -ENOMEM;
152 goto err_exit;
153 }
154
155 err_exit:
156 if (err < 0) {
157 aq_ring_free(self);
158 self = NULL;
159 }
160
161 return self;
162 }
163
aq_ring_rx_alloc(struct aq_ring_s * self,struct aq_nic_s * aq_nic,unsigned int idx,struct aq_nic_cfg_s * aq_nic_cfg)164 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
165 struct aq_nic_s *aq_nic,
166 unsigned int idx,
167 struct aq_nic_cfg_s *aq_nic_cfg)
168 {
169 int err = 0;
170
171 self->aq_nic = aq_nic;
172 self->idx = idx;
173 self->size = aq_nic_cfg->rxds;
174 self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
175 self->page_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
176 (AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
177
178 if (aq_nic_cfg->rxpageorder > self->page_order)
179 self->page_order = aq_nic_cfg->rxpageorder;
180
181 self = aq_ring_alloc(self, aq_nic);
182 if (!self) {
183 err = -ENOMEM;
184 goto err_exit;
185 }
186
187 err_exit:
188 if (err < 0) {
189 aq_ring_free(self);
190 self = NULL;
191 }
192
193 return self;
194 }
195
196 struct aq_ring_s *
aq_ring_hwts_rx_alloc(struct aq_ring_s * self,struct aq_nic_s * aq_nic,unsigned int idx,unsigned int size,unsigned int dx_size)197 aq_ring_hwts_rx_alloc(struct aq_ring_s *self, struct aq_nic_s *aq_nic,
198 unsigned int idx, unsigned int size, unsigned int dx_size)
199 {
200 struct device *dev = aq_nic_get_dev(aq_nic);
201 size_t sz = size * dx_size + AQ_CFG_RXDS_DEF;
202
203 memset(self, 0, sizeof(*self));
204
205 self->aq_nic = aq_nic;
206 self->idx = idx;
207 self->size = size;
208 self->dx_size = dx_size;
209
210 self->dx_ring = dma_alloc_coherent(dev, sz, &self->dx_ring_pa,
211 GFP_KERNEL);
212 if (!self->dx_ring) {
213 aq_ring_free(self);
214 return NULL;
215 }
216
217 return self;
218 }
219
aq_ring_init(struct aq_ring_s * self,const enum atl_ring_type ring_type)220 int aq_ring_init(struct aq_ring_s *self, const enum atl_ring_type ring_type)
221 {
222 self->hw_head = 0;
223 self->sw_head = 0;
224 self->sw_tail = 0;
225 self->ring_type = ring_type;
226
227 if (self->ring_type == ATL_RING_RX)
228 u64_stats_init(&self->stats.rx.syncp);
229 else
230 u64_stats_init(&self->stats.tx.syncp);
231
232 return 0;
233 }
234
aq_ring_dx_in_range(unsigned int h,unsigned int i,unsigned int t)235 static inline bool aq_ring_dx_in_range(unsigned int h, unsigned int i,
236 unsigned int t)
237 {
238 return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t));
239 }
240
aq_ring_update_queue_state(struct aq_ring_s * ring)241 void aq_ring_update_queue_state(struct aq_ring_s *ring)
242 {
243 if (aq_ring_avail_dx(ring) <= AQ_CFG_SKB_FRAGS_MAX)
244 aq_ring_queue_stop(ring);
245 else if (aq_ring_avail_dx(ring) > AQ_CFG_RESTART_DESC_THRES)
246 aq_ring_queue_wake(ring);
247 }
248
aq_ring_queue_wake(struct aq_ring_s * ring)249 void aq_ring_queue_wake(struct aq_ring_s *ring)
250 {
251 struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
252
253 if (__netif_subqueue_stopped(ndev,
254 AQ_NIC_RING2QMAP(ring->aq_nic,
255 ring->idx))) {
256 netif_wake_subqueue(ndev,
257 AQ_NIC_RING2QMAP(ring->aq_nic, ring->idx));
258 u64_stats_update_begin(&ring->stats.tx.syncp);
259 ring->stats.tx.queue_restarts++;
260 u64_stats_update_end(&ring->stats.tx.syncp);
261 }
262 }
263
aq_ring_queue_stop(struct aq_ring_s * ring)264 void aq_ring_queue_stop(struct aq_ring_s *ring)
265 {
266 struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
267
268 if (!__netif_subqueue_stopped(ndev,
269 AQ_NIC_RING2QMAP(ring->aq_nic,
270 ring->idx)))
271 netif_stop_subqueue(ndev,
272 AQ_NIC_RING2QMAP(ring->aq_nic, ring->idx));
273 }
274
aq_ring_tx_clean(struct aq_ring_s * self)275 bool aq_ring_tx_clean(struct aq_ring_s *self)
276 {
277 struct device *dev = aq_nic_get_dev(self->aq_nic);
278 unsigned int budget;
279
280 for (budget = AQ_CFG_TX_CLEAN_BUDGET;
281 budget && self->sw_head != self->hw_head; budget--) {
282 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
283
284 if (likely(buff->is_mapped)) {
285 if (unlikely(buff->is_sop)) {
286 if (!buff->is_eop &&
287 buff->eop_index != 0xffffU &&
288 (!aq_ring_dx_in_range(self->sw_head,
289 buff->eop_index,
290 self->hw_head)))
291 break;
292
293 dma_unmap_single(dev, buff->pa, buff->len,
294 DMA_TO_DEVICE);
295 } else {
296 dma_unmap_page(dev, buff->pa, buff->len,
297 DMA_TO_DEVICE);
298 }
299 }
300
301 if (unlikely(buff->is_eop)) {
302 u64_stats_update_begin(&self->stats.tx.syncp);
303 ++self->stats.tx.packets;
304 self->stats.tx.bytes += buff->skb->len;
305 u64_stats_update_end(&self->stats.tx.syncp);
306
307 dev_kfree_skb_any(buff->skb);
308 }
309 buff->pa = 0U;
310 buff->eop_index = 0xffffU;
311 self->sw_head = aq_ring_next_dx(self, self->sw_head);
312 }
313
314 return !!budget;
315 }
316
aq_rx_checksum(struct aq_ring_s * self,struct aq_ring_buff_s * buff,struct sk_buff * skb)317 static void aq_rx_checksum(struct aq_ring_s *self,
318 struct aq_ring_buff_s *buff,
319 struct sk_buff *skb)
320 {
321 if (!(self->aq_nic->ndev->features & NETIF_F_RXCSUM))
322 return;
323
324 if (unlikely(buff->is_cso_err)) {
325 u64_stats_update_begin(&self->stats.rx.syncp);
326 ++self->stats.rx.errors;
327 u64_stats_update_end(&self->stats.rx.syncp);
328 skb->ip_summed = CHECKSUM_NONE;
329 return;
330 }
331 if (buff->is_ip_cso) {
332 __skb_incr_checksum_unnecessary(skb);
333 } else {
334 skb->ip_summed = CHECKSUM_NONE;
335 }
336
337 if (buff->is_udp_cso || buff->is_tcp_cso)
338 __skb_incr_checksum_unnecessary(skb);
339 }
340
341 #define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
aq_ring_rx_clean(struct aq_ring_s * self,struct napi_struct * napi,int * work_done,int budget)342 int aq_ring_rx_clean(struct aq_ring_s *self,
343 struct napi_struct *napi,
344 int *work_done,
345 int budget)
346 {
347 struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
348 int err = 0;
349
350 for (; (self->sw_head != self->hw_head) && budget;
351 self->sw_head = aq_ring_next_dx(self, self->sw_head),
352 --budget, ++(*work_done)) {
353 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
354 bool is_ptp_ring = aq_ptp_ring(self->aq_nic, self);
355 struct aq_ring_buff_s *buff_ = NULL;
356 struct sk_buff *skb = NULL;
357 unsigned int next_ = 0U;
358 unsigned int i = 0U;
359 u16 hdr_len;
360
361 if (buff->is_cleaned)
362 continue;
363
364 if (!buff->is_eop) {
365 unsigned int frag_cnt = 0U;
366 buff_ = buff;
367 do {
368 bool is_rsc_completed = true;
369
370 if (buff_->next >= self->size) {
371 err = -EIO;
372 goto err_exit;
373 }
374
375 frag_cnt++;
376 next_ = buff_->next,
377 buff_ = &self->buff_ring[next_];
378 is_rsc_completed =
379 aq_ring_dx_in_range(self->sw_head,
380 next_,
381 self->hw_head);
382
383 if (unlikely(!is_rsc_completed) ||
384 frag_cnt > MAX_SKB_FRAGS) {
385 err = 0;
386 goto err_exit;
387 }
388
389 buff->is_error |= buff_->is_error;
390 buff->is_cso_err |= buff_->is_cso_err;
391
392 } while (!buff_->is_eop);
393
394 if (buff->is_error ||
395 (buff->is_lro && buff->is_cso_err)) {
396 buff_ = buff;
397 do {
398 if (buff_->next >= self->size) {
399 err = -EIO;
400 goto err_exit;
401 }
402 next_ = buff_->next,
403 buff_ = &self->buff_ring[next_];
404
405 buff_->is_cleaned = true;
406 } while (!buff_->is_eop);
407
408 u64_stats_update_begin(&self->stats.rx.syncp);
409 ++self->stats.rx.errors;
410 u64_stats_update_end(&self->stats.rx.syncp);
411 continue;
412 }
413 }
414
415 if (buff->is_error) {
416 u64_stats_update_begin(&self->stats.rx.syncp);
417 ++self->stats.rx.errors;
418 u64_stats_update_end(&self->stats.rx.syncp);
419 continue;
420 }
421
422 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
423 buff->rxdata.daddr,
424 buff->rxdata.pg_off,
425 buff->len, DMA_FROM_DEVICE);
426
427 skb = napi_alloc_skb(napi, AQ_CFG_RX_HDR_SIZE);
428 if (unlikely(!skb)) {
429 u64_stats_update_begin(&self->stats.rx.syncp);
430 self->stats.rx.skb_alloc_fails++;
431 u64_stats_update_end(&self->stats.rx.syncp);
432 err = -ENOMEM;
433 goto err_exit;
434 }
435 if (is_ptp_ring)
436 buff->len -=
437 aq_ptp_extract_ts(self->aq_nic, skb,
438 aq_buf_vaddr(&buff->rxdata),
439 buff->len);
440
441 hdr_len = buff->len;
442 if (hdr_len > AQ_CFG_RX_HDR_SIZE)
443 hdr_len = eth_get_headlen(skb->dev,
444 aq_buf_vaddr(&buff->rxdata),
445 AQ_CFG_RX_HDR_SIZE);
446
447 memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
448 ALIGN(hdr_len, sizeof(long)));
449
450 if (buff->len - hdr_len > 0) {
451 skb_add_rx_frag(skb, i++, buff->rxdata.page,
452 buff->rxdata.pg_off + hdr_len,
453 buff->len - hdr_len,
454 AQ_CFG_RX_FRAME_MAX);
455 page_ref_inc(buff->rxdata.page);
456 }
457
458 if (!buff->is_eop) {
459 buff_ = buff;
460 do {
461 next_ = buff_->next;
462 buff_ = &self->buff_ring[next_];
463
464 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
465 buff_->rxdata.daddr,
466 buff_->rxdata.pg_off,
467 buff_->len,
468 DMA_FROM_DEVICE);
469 skb_add_rx_frag(skb, i++,
470 buff_->rxdata.page,
471 buff_->rxdata.pg_off,
472 buff_->len,
473 AQ_CFG_RX_FRAME_MAX);
474 page_ref_inc(buff_->rxdata.page);
475 buff_->is_cleaned = 1;
476
477 buff->is_ip_cso &= buff_->is_ip_cso;
478 buff->is_udp_cso &= buff_->is_udp_cso;
479 buff->is_tcp_cso &= buff_->is_tcp_cso;
480 buff->is_cso_err |= buff_->is_cso_err;
481
482 } while (!buff_->is_eop);
483 }
484
485 if (buff->is_vlan)
486 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
487 buff->vlan_rx_tag);
488
489 skb->protocol = eth_type_trans(skb, ndev);
490
491 aq_rx_checksum(self, buff, skb);
492
493 skb_set_hash(skb, buff->rss_hash,
494 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
495 PKT_HASH_TYPE_NONE);
496 /* Send all PTP traffic to 0 queue */
497 skb_record_rx_queue(skb,
498 is_ptp_ring ? 0
499 : AQ_NIC_RING2QMAP(self->aq_nic,
500 self->idx));
501
502 u64_stats_update_begin(&self->stats.rx.syncp);
503 ++self->stats.rx.packets;
504 self->stats.rx.bytes += skb->len;
505 u64_stats_update_end(&self->stats.rx.syncp);
506
507 napi_gro_receive(napi, skb);
508 }
509
510 err_exit:
511 return err;
512 }
513
aq_ring_hwts_rx_clean(struct aq_ring_s * self,struct aq_nic_s * aq_nic)514 void aq_ring_hwts_rx_clean(struct aq_ring_s *self, struct aq_nic_s *aq_nic)
515 {
516 #if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
517 while (self->sw_head != self->hw_head) {
518 u64 ns;
519
520 aq_nic->aq_hw_ops->extract_hwts(aq_nic->aq_hw,
521 self->dx_ring +
522 (self->sw_head * self->dx_size),
523 self->dx_size, &ns);
524 aq_ptp_tx_hwtstamp(aq_nic, ns);
525
526 self->sw_head = aq_ring_next_dx(self, self->sw_head);
527 }
528 #endif
529 }
530
aq_ring_rx_fill(struct aq_ring_s * self)531 int aq_ring_rx_fill(struct aq_ring_s *self)
532 {
533 unsigned int page_order = self->page_order;
534 struct aq_ring_buff_s *buff = NULL;
535 int err = 0;
536 int i = 0;
537
538 if (aq_ring_avail_dx(self) < min_t(unsigned int, AQ_CFG_RX_REFILL_THRES,
539 self->size / 2))
540 return err;
541
542 for (i = aq_ring_avail_dx(self); i--;
543 self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
544 buff = &self->buff_ring[self->sw_tail];
545
546 buff->flags = 0U;
547 buff->len = AQ_CFG_RX_FRAME_MAX;
548
549 err = aq_get_rxpages(self, buff, page_order);
550 if (err)
551 goto err_exit;
552
553 buff->pa = aq_buf_daddr(&buff->rxdata);
554 buff = NULL;
555 }
556
557 err_exit:
558 return err;
559 }
560
aq_ring_rx_deinit(struct aq_ring_s * self)561 void aq_ring_rx_deinit(struct aq_ring_s *self)
562 {
563 if (!self)
564 return;
565
566 for (; self->sw_head != self->sw_tail;
567 self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
568 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
569
570 aq_free_rxpage(&buff->rxdata, aq_nic_get_dev(self->aq_nic));
571 }
572 }
573
aq_ring_free(struct aq_ring_s * self)574 void aq_ring_free(struct aq_ring_s *self)
575 {
576 if (!self)
577 return;
578
579 kfree(self->buff_ring);
580 self->buff_ring = NULL;
581
582 if (self->dx_ring) {
583 dma_free_coherent(aq_nic_get_dev(self->aq_nic),
584 self->size * self->dx_size, self->dx_ring,
585 self->dx_ring_pa);
586 self->dx_ring = NULL;
587 }
588 }
589
aq_ring_fill_stats_data(struct aq_ring_s * self,u64 * data)590 unsigned int aq_ring_fill_stats_data(struct aq_ring_s *self, u64 *data)
591 {
592 unsigned int count;
593 unsigned int start;
594
595 if (self->ring_type == ATL_RING_RX) {
596 /* This data should mimic aq_ethtool_queue_rx_stat_names structure */
597 do {
598 count = 0;
599 start = u64_stats_fetch_begin_irq(&self->stats.rx.syncp);
600 data[count] = self->stats.rx.packets;
601 data[++count] = self->stats.rx.jumbo_packets;
602 data[++count] = self->stats.rx.lro_packets;
603 data[++count] = self->stats.rx.errors;
604 data[++count] = self->stats.rx.alloc_fails;
605 data[++count] = self->stats.rx.skb_alloc_fails;
606 data[++count] = self->stats.rx.polls;
607 } while (u64_stats_fetch_retry_irq(&self->stats.rx.syncp, start));
608 } else {
609 /* This data should mimic aq_ethtool_queue_tx_stat_names structure */
610 do {
611 count = 0;
612 start = u64_stats_fetch_begin_irq(&self->stats.tx.syncp);
613 data[count] = self->stats.tx.packets;
614 data[++count] = self->stats.tx.queue_restarts;
615 } while (u64_stats_fetch_retry_irq(&self->stats.tx.syncp, start));
616 }
617
618 return ++count;
619 }
620