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_nic.h"
11 #include "aq_hw.h"
12 #include "aq_hw_utils.h"
13 #include "aq_ptp.h"
14 #include "aq_vec.h"
15 #include "aq_main.h"
16
17 #include <net/xdp.h>
18 #include <linux/filter.h>
19 #include <linux/bpf_trace.h>
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22
aq_get_rxpages_xdp(struct aq_ring_buff_s * buff,struct xdp_buff * xdp)23 static void aq_get_rxpages_xdp(struct aq_ring_buff_s *buff,
24 struct xdp_buff *xdp)
25 {
26 struct skb_shared_info *sinfo;
27 int i;
28
29 if (xdp_buff_has_frags(xdp)) {
30 sinfo = xdp_get_shared_info_from_buff(xdp);
31
32 for (i = 0; i < sinfo->nr_frags; i++) {
33 skb_frag_t *frag = &sinfo->frags[i];
34
35 page_ref_inc(skb_frag_page(frag));
36 }
37 }
38 page_ref_inc(buff->rxdata.page);
39 }
40
aq_free_rxpage(struct aq_rxpage * rxpage,struct device * dev)41 static inline void aq_free_rxpage(struct aq_rxpage *rxpage, struct device *dev)
42 {
43 unsigned int len = PAGE_SIZE << rxpage->order;
44
45 dma_unmap_page(dev, rxpage->daddr, len, DMA_FROM_DEVICE);
46
47 /* Drop the ref for being in the ring. */
48 __free_pages(rxpage->page, rxpage->order);
49 rxpage->page = NULL;
50 }
51
aq_alloc_rxpages(struct aq_rxpage * rxpage,struct aq_ring_s * rx_ring)52 static int aq_alloc_rxpages(struct aq_rxpage *rxpage, struct aq_ring_s *rx_ring)
53 {
54 struct device *dev = aq_nic_get_dev(rx_ring->aq_nic);
55 unsigned int order = rx_ring->page_order;
56 struct page *page;
57 int ret = -ENOMEM;
58 dma_addr_t daddr;
59
60 page = dev_alloc_pages(order);
61 if (unlikely(!page))
62 goto err_exit;
63
64 daddr = dma_map_page(dev, page, 0, PAGE_SIZE << order,
65 DMA_FROM_DEVICE);
66
67 if (unlikely(dma_mapping_error(dev, daddr)))
68 goto free_page;
69
70 rxpage->page = page;
71 rxpage->daddr = daddr;
72 rxpage->order = order;
73 rxpage->pg_off = rx_ring->page_offset;
74
75 return 0;
76
77 free_page:
78 __free_pages(page, order);
79
80 err_exit:
81 return ret;
82 }
83
aq_get_rxpages(struct aq_ring_s * self,struct aq_ring_buff_s * rxbuf)84 static int aq_get_rxpages(struct aq_ring_s *self, struct aq_ring_buff_s *rxbuf)
85 {
86 unsigned int order = self->page_order;
87 u16 page_offset = self->page_offset;
88 u16 frame_max = self->frame_max;
89 u16 tail_size = self->tail_size;
90 int ret;
91
92 if (rxbuf->rxdata.page) {
93 /* One means ring is the only user and can reuse */
94 if (page_ref_count(rxbuf->rxdata.page) > 1) {
95 /* Try reuse buffer */
96 rxbuf->rxdata.pg_off += frame_max + page_offset +
97 tail_size;
98 if (rxbuf->rxdata.pg_off + frame_max + tail_size <=
99 (PAGE_SIZE << order)) {
100 u64_stats_update_begin(&self->stats.rx.syncp);
101 self->stats.rx.pg_flips++;
102 u64_stats_update_end(&self->stats.rx.syncp);
103
104 } else {
105 /* Buffer exhausted. We have other users and
106 * should release this page and realloc
107 */
108 aq_free_rxpage(&rxbuf->rxdata,
109 aq_nic_get_dev(self->aq_nic));
110 u64_stats_update_begin(&self->stats.rx.syncp);
111 self->stats.rx.pg_losts++;
112 u64_stats_update_end(&self->stats.rx.syncp);
113 }
114 } else {
115 rxbuf->rxdata.pg_off = page_offset;
116 u64_stats_update_begin(&self->stats.rx.syncp);
117 self->stats.rx.pg_reuses++;
118 u64_stats_update_end(&self->stats.rx.syncp);
119 }
120 }
121
122 if (!rxbuf->rxdata.page) {
123 ret = aq_alloc_rxpages(&rxbuf->rxdata, self);
124 if (ret) {
125 u64_stats_update_begin(&self->stats.rx.syncp);
126 self->stats.rx.alloc_fails++;
127 u64_stats_update_end(&self->stats.rx.syncp);
128 }
129 return ret;
130 }
131
132 return 0;
133 }
134
aq_ring_alloc(struct aq_ring_s * self,struct aq_nic_s * aq_nic)135 static struct aq_ring_s *aq_ring_alloc(struct aq_ring_s *self,
136 struct aq_nic_s *aq_nic)
137 {
138 int err = 0;
139
140 self->buff_ring =
141 kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);
142
143 if (!self->buff_ring) {
144 err = -ENOMEM;
145 goto err_exit;
146 }
147
148 self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
149 self->size * self->dx_size,
150 &self->dx_ring_pa, GFP_KERNEL);
151 if (!self->dx_ring) {
152 err = -ENOMEM;
153 goto err_exit;
154 }
155
156 err_exit:
157 if (err < 0) {
158 aq_ring_free(self);
159 self = NULL;
160 }
161
162 return self;
163 }
164
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)165 struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
166 struct aq_nic_s *aq_nic,
167 unsigned int idx,
168 struct aq_nic_cfg_s *aq_nic_cfg)
169 {
170 int err = 0;
171
172 self->aq_nic = aq_nic;
173 self->idx = idx;
174 self->size = aq_nic_cfg->txds;
175 self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;
176
177 self = aq_ring_alloc(self, aq_nic);
178 if (!self) {
179 err = -ENOMEM;
180 goto err_exit;
181 }
182
183 err_exit:
184 if (err < 0) {
185 aq_ring_free(self);
186 self = NULL;
187 }
188
189 return self;
190 }
191
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)192 struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
193 struct aq_nic_s *aq_nic,
194 unsigned int idx,
195 struct aq_nic_cfg_s *aq_nic_cfg)
196 {
197 int err = 0;
198
199 self->aq_nic = aq_nic;
200 self->idx = idx;
201 self->size = aq_nic_cfg->rxds;
202 self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
203 self->xdp_prog = aq_nic->xdp_prog;
204 self->frame_max = AQ_CFG_RX_FRAME_MAX;
205
206 /* Only order-2 is allowed if XDP is enabled */
207 if (READ_ONCE(self->xdp_prog)) {
208 self->page_offset = AQ_XDP_HEADROOM;
209 self->page_order = AQ_CFG_XDP_PAGEORDER;
210 self->tail_size = AQ_XDP_TAILROOM;
211 } else {
212 self->page_offset = 0;
213 self->page_order = fls(self->frame_max / PAGE_SIZE +
214 (self->frame_max % PAGE_SIZE ? 1 : 0)) - 1;
215 if (aq_nic_cfg->rxpageorder > self->page_order)
216 self->page_order = aq_nic_cfg->rxpageorder;
217 self->tail_size = 0;
218 }
219
220 self = aq_ring_alloc(self, aq_nic);
221 if (!self) {
222 err = -ENOMEM;
223 goto err_exit;
224 }
225
226 err_exit:
227 if (err < 0) {
228 aq_ring_free(self);
229 self = NULL;
230 }
231
232 return self;
233 }
234
235 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)236 aq_ring_hwts_rx_alloc(struct aq_ring_s *self, struct aq_nic_s *aq_nic,
237 unsigned int idx, unsigned int size, unsigned int dx_size)
238 {
239 struct device *dev = aq_nic_get_dev(aq_nic);
240 size_t sz = size * dx_size + AQ_CFG_RXDS_DEF;
241
242 memset(self, 0, sizeof(*self));
243
244 self->aq_nic = aq_nic;
245 self->idx = idx;
246 self->size = size;
247 self->dx_size = dx_size;
248
249 self->dx_ring = dma_alloc_coherent(dev, sz, &self->dx_ring_pa,
250 GFP_KERNEL);
251 if (!self->dx_ring) {
252 aq_ring_free(self);
253 return NULL;
254 }
255
256 return self;
257 }
258
aq_ring_init(struct aq_ring_s * self,const enum atl_ring_type ring_type)259 int aq_ring_init(struct aq_ring_s *self, const enum atl_ring_type ring_type)
260 {
261 self->hw_head = 0;
262 self->sw_head = 0;
263 self->sw_tail = 0;
264 self->ring_type = ring_type;
265
266 if (self->ring_type == ATL_RING_RX)
267 u64_stats_init(&self->stats.rx.syncp);
268 else
269 u64_stats_init(&self->stats.tx.syncp);
270
271 return 0;
272 }
273
aq_ring_dx_in_range(unsigned int h,unsigned int i,unsigned int t)274 static inline bool aq_ring_dx_in_range(unsigned int h, unsigned int i,
275 unsigned int t)
276 {
277 return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t));
278 }
279
aq_ring_update_queue_state(struct aq_ring_s * ring)280 void aq_ring_update_queue_state(struct aq_ring_s *ring)
281 {
282 if (aq_ring_avail_dx(ring) <= AQ_CFG_SKB_FRAGS_MAX)
283 aq_ring_queue_stop(ring);
284 else if (aq_ring_avail_dx(ring) > AQ_CFG_RESTART_DESC_THRES)
285 aq_ring_queue_wake(ring);
286 }
287
aq_ring_queue_wake(struct aq_ring_s * ring)288 void aq_ring_queue_wake(struct aq_ring_s *ring)
289 {
290 struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
291
292 if (__netif_subqueue_stopped(ndev,
293 AQ_NIC_RING2QMAP(ring->aq_nic,
294 ring->idx))) {
295 netif_wake_subqueue(ndev,
296 AQ_NIC_RING2QMAP(ring->aq_nic, ring->idx));
297 u64_stats_update_begin(&ring->stats.tx.syncp);
298 ring->stats.tx.queue_restarts++;
299 u64_stats_update_end(&ring->stats.tx.syncp);
300 }
301 }
302
aq_ring_queue_stop(struct aq_ring_s * ring)303 void aq_ring_queue_stop(struct aq_ring_s *ring)
304 {
305 struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
306
307 if (!__netif_subqueue_stopped(ndev,
308 AQ_NIC_RING2QMAP(ring->aq_nic,
309 ring->idx)))
310 netif_stop_subqueue(ndev,
311 AQ_NIC_RING2QMAP(ring->aq_nic, ring->idx));
312 }
313
aq_ring_tx_clean(struct aq_ring_s * self)314 bool aq_ring_tx_clean(struct aq_ring_s *self)
315 {
316 struct device *dev = aq_nic_get_dev(self->aq_nic);
317 unsigned int budget;
318
319 for (budget = AQ_CFG_TX_CLEAN_BUDGET;
320 budget && self->sw_head != self->hw_head; budget--) {
321 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
322
323 if (likely(buff->is_mapped)) {
324 if (unlikely(buff->is_sop)) {
325 if (!buff->is_eop &&
326 buff->eop_index != 0xffffU &&
327 (!aq_ring_dx_in_range(self->sw_head,
328 buff->eop_index,
329 self->hw_head)))
330 break;
331
332 dma_unmap_single(dev, buff->pa, buff->len,
333 DMA_TO_DEVICE);
334 } else {
335 dma_unmap_page(dev, buff->pa, buff->len,
336 DMA_TO_DEVICE);
337 }
338 }
339
340 if (likely(!buff->is_eop))
341 goto out;
342
343 if (buff->skb) {
344 u64_stats_update_begin(&self->stats.tx.syncp);
345 ++self->stats.tx.packets;
346 self->stats.tx.bytes += buff->skb->len;
347 u64_stats_update_end(&self->stats.tx.syncp);
348 dev_kfree_skb_any(buff->skb);
349 } else if (buff->xdpf) {
350 u64_stats_update_begin(&self->stats.tx.syncp);
351 ++self->stats.tx.packets;
352 self->stats.tx.bytes += xdp_get_frame_len(buff->xdpf);
353 u64_stats_update_end(&self->stats.tx.syncp);
354 xdp_return_frame_rx_napi(buff->xdpf);
355 }
356
357 out:
358 buff->skb = NULL;
359 buff->xdpf = NULL;
360 buff->pa = 0U;
361 buff->eop_index = 0xffffU;
362 self->sw_head = aq_ring_next_dx(self, self->sw_head);
363 }
364
365 return !!budget;
366 }
367
aq_rx_checksum(struct aq_ring_s * self,struct aq_ring_buff_s * buff,struct sk_buff * skb)368 static void aq_rx_checksum(struct aq_ring_s *self,
369 struct aq_ring_buff_s *buff,
370 struct sk_buff *skb)
371 {
372 if (!(self->aq_nic->ndev->features & NETIF_F_RXCSUM))
373 return;
374
375 if (unlikely(buff->is_cso_err)) {
376 u64_stats_update_begin(&self->stats.rx.syncp);
377 ++self->stats.rx.errors;
378 u64_stats_update_end(&self->stats.rx.syncp);
379 skb->ip_summed = CHECKSUM_NONE;
380 return;
381 }
382 if (buff->is_ip_cso) {
383 __skb_incr_checksum_unnecessary(skb);
384 } else {
385 skb->ip_summed = CHECKSUM_NONE;
386 }
387
388 if (buff->is_udp_cso || buff->is_tcp_cso)
389 __skb_incr_checksum_unnecessary(skb);
390 }
391
aq_xdp_xmit(struct net_device * dev,int num_frames,struct xdp_frame ** frames,u32 flags)392 int aq_xdp_xmit(struct net_device *dev, int num_frames,
393 struct xdp_frame **frames, u32 flags)
394 {
395 struct aq_nic_s *aq_nic = netdev_priv(dev);
396 unsigned int vec, i, drop = 0;
397 int cpu = smp_processor_id();
398 struct aq_nic_cfg_s *aq_cfg;
399 struct aq_ring_s *ring;
400
401 aq_cfg = aq_nic_get_cfg(aq_nic);
402 vec = cpu % aq_cfg->vecs;
403 ring = aq_nic->aq_ring_tx[AQ_NIC_CFG_TCVEC2RING(aq_cfg, 0, vec)];
404
405 for (i = 0; i < num_frames; i++) {
406 struct xdp_frame *xdpf = frames[i];
407
408 if (aq_nic_xmit_xdpf(aq_nic, ring, xdpf) == NETDEV_TX_BUSY)
409 drop++;
410 }
411
412 return num_frames - drop;
413 }
414
aq_xdp_run_prog(struct aq_nic_s * aq_nic,struct xdp_buff * xdp,struct aq_ring_s * rx_ring,struct aq_ring_buff_s * buff)415 static struct sk_buff *aq_xdp_run_prog(struct aq_nic_s *aq_nic,
416 struct xdp_buff *xdp,
417 struct aq_ring_s *rx_ring,
418 struct aq_ring_buff_s *buff)
419 {
420 int result = NETDEV_TX_BUSY;
421 struct aq_ring_s *tx_ring;
422 struct xdp_frame *xdpf;
423 struct bpf_prog *prog;
424 u32 act = XDP_ABORTED;
425 struct sk_buff *skb;
426
427 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
428 ++rx_ring->stats.rx.packets;
429 rx_ring->stats.rx.bytes += xdp_get_buff_len(xdp);
430 u64_stats_update_end(&rx_ring->stats.rx.syncp);
431
432 prog = READ_ONCE(rx_ring->xdp_prog);
433 if (!prog)
434 goto pass;
435
436 prefetchw(xdp->data_hard_start); /* xdp_frame write */
437
438 /* single buffer XDP program, but packet is multi buffer, aborted */
439 if (xdp_buff_has_frags(xdp) && !prog->aux->xdp_has_frags)
440 goto out_aborted;
441
442 act = bpf_prog_run_xdp(prog, xdp);
443 switch (act) {
444 case XDP_PASS:
445 pass:
446 xdpf = xdp_convert_buff_to_frame(xdp);
447 if (unlikely(!xdpf))
448 goto out_aborted;
449 skb = xdp_build_skb_from_frame(xdpf, aq_nic->ndev);
450 if (!skb)
451 goto out_aborted;
452 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
453 ++rx_ring->stats.rx.xdp_pass;
454 u64_stats_update_end(&rx_ring->stats.rx.syncp);
455 aq_get_rxpages_xdp(buff, xdp);
456 return skb;
457 case XDP_TX:
458 xdpf = xdp_convert_buff_to_frame(xdp);
459 if (unlikely(!xdpf))
460 goto out_aborted;
461 tx_ring = aq_nic->aq_ring_tx[rx_ring->idx];
462 result = aq_nic_xmit_xdpf(aq_nic, tx_ring, xdpf);
463 if (result == NETDEV_TX_BUSY)
464 goto out_aborted;
465 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
466 ++rx_ring->stats.rx.xdp_tx;
467 u64_stats_update_end(&rx_ring->stats.rx.syncp);
468 aq_get_rxpages_xdp(buff, xdp);
469 break;
470 case XDP_REDIRECT:
471 if (xdp_do_redirect(aq_nic->ndev, xdp, prog) < 0)
472 goto out_aborted;
473 xdp_do_flush();
474 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
475 ++rx_ring->stats.rx.xdp_redirect;
476 u64_stats_update_end(&rx_ring->stats.rx.syncp);
477 aq_get_rxpages_xdp(buff, xdp);
478 break;
479 default:
480 fallthrough;
481 case XDP_ABORTED:
482 out_aborted:
483 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
484 ++rx_ring->stats.rx.xdp_aborted;
485 u64_stats_update_end(&rx_ring->stats.rx.syncp);
486 trace_xdp_exception(aq_nic->ndev, prog, act);
487 bpf_warn_invalid_xdp_action(aq_nic->ndev, prog, act);
488 break;
489 case XDP_DROP:
490 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
491 ++rx_ring->stats.rx.xdp_drop;
492 u64_stats_update_end(&rx_ring->stats.rx.syncp);
493 break;
494 }
495
496 return ERR_PTR(-result);
497 }
498
aq_add_rx_fragment(struct device * dev,struct aq_ring_s * ring,struct aq_ring_buff_s * buff,struct xdp_buff * xdp)499 static bool aq_add_rx_fragment(struct device *dev,
500 struct aq_ring_s *ring,
501 struct aq_ring_buff_s *buff,
502 struct xdp_buff *xdp)
503 {
504 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
505 struct aq_ring_buff_s *buff_ = buff;
506
507 memset(sinfo, 0, sizeof(*sinfo));
508 do {
509 skb_frag_t *frag;
510
511 if (unlikely(sinfo->nr_frags >= MAX_SKB_FRAGS))
512 return true;
513
514 frag = &sinfo->frags[sinfo->nr_frags++];
515 buff_ = &ring->buff_ring[buff_->next];
516 dma_sync_single_range_for_cpu(dev,
517 buff_->rxdata.daddr,
518 buff_->rxdata.pg_off,
519 buff_->len,
520 DMA_FROM_DEVICE);
521 skb_frag_off_set(frag, buff_->rxdata.pg_off);
522 skb_frag_size_set(frag, buff_->len);
523 sinfo->xdp_frags_size += buff_->len;
524 __skb_frag_set_page(frag, buff_->rxdata.page);
525
526 buff_->is_cleaned = 1;
527
528 buff->is_ip_cso &= buff_->is_ip_cso;
529 buff->is_udp_cso &= buff_->is_udp_cso;
530 buff->is_tcp_cso &= buff_->is_tcp_cso;
531 buff->is_cso_err |= buff_->is_cso_err;
532
533 if (page_is_pfmemalloc(buff_->rxdata.page))
534 xdp_buff_set_frag_pfmemalloc(xdp);
535
536 } while (!buff_->is_eop);
537
538 xdp_buff_set_frags_flag(xdp);
539
540 return false;
541 }
542
__aq_ring_rx_clean(struct aq_ring_s * self,struct napi_struct * napi,int * work_done,int budget)543 static int __aq_ring_rx_clean(struct aq_ring_s *self, struct napi_struct *napi,
544 int *work_done, int budget)
545 {
546 struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
547 int err = 0;
548
549 for (; (self->sw_head != self->hw_head) && budget;
550 self->sw_head = aq_ring_next_dx(self, self->sw_head),
551 --budget, ++(*work_done)) {
552 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
553 bool is_ptp_ring = aq_ptp_ring(self->aq_nic, self);
554 struct aq_ring_buff_s *buff_ = NULL;
555 struct sk_buff *skb = NULL;
556 unsigned int next_ = 0U;
557 unsigned int i = 0U;
558 u16 hdr_len;
559
560 if (buff->is_cleaned)
561 continue;
562
563 if (!buff->is_eop) {
564 unsigned int frag_cnt = 0U;
565 buff_ = buff;
566 do {
567 bool is_rsc_completed = true;
568
569 if (buff_->next >= self->size) {
570 err = -EIO;
571 goto err_exit;
572 }
573
574 frag_cnt++;
575 next_ = buff_->next,
576 buff_ = &self->buff_ring[next_];
577 is_rsc_completed =
578 aq_ring_dx_in_range(self->sw_head,
579 next_,
580 self->hw_head);
581
582 if (unlikely(!is_rsc_completed) ||
583 frag_cnt > MAX_SKB_FRAGS) {
584 err = 0;
585 goto err_exit;
586 }
587
588 buff->is_error |= buff_->is_error;
589 buff->is_cso_err |= buff_->is_cso_err;
590
591 } while (!buff_->is_eop);
592
593 if (buff->is_error ||
594 (buff->is_lro && buff->is_cso_err)) {
595 buff_ = buff;
596 do {
597 if (buff_->next >= self->size) {
598 err = -EIO;
599 goto err_exit;
600 }
601 next_ = buff_->next,
602 buff_ = &self->buff_ring[next_];
603
604 buff_->is_cleaned = true;
605 } while (!buff_->is_eop);
606
607 u64_stats_update_begin(&self->stats.rx.syncp);
608 ++self->stats.rx.errors;
609 u64_stats_update_end(&self->stats.rx.syncp);
610 continue;
611 }
612 }
613
614 if (buff->is_error) {
615 u64_stats_update_begin(&self->stats.rx.syncp);
616 ++self->stats.rx.errors;
617 u64_stats_update_end(&self->stats.rx.syncp);
618 continue;
619 }
620
621 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
622 buff->rxdata.daddr,
623 buff->rxdata.pg_off,
624 buff->len, DMA_FROM_DEVICE);
625
626 skb = napi_alloc_skb(napi, AQ_CFG_RX_HDR_SIZE);
627 if (unlikely(!skb)) {
628 u64_stats_update_begin(&self->stats.rx.syncp);
629 self->stats.rx.skb_alloc_fails++;
630 u64_stats_update_end(&self->stats.rx.syncp);
631 err = -ENOMEM;
632 goto err_exit;
633 }
634 if (is_ptp_ring)
635 buff->len -=
636 aq_ptp_extract_ts(self->aq_nic, skb,
637 aq_buf_vaddr(&buff->rxdata),
638 buff->len);
639
640 hdr_len = buff->len;
641 if (hdr_len > AQ_CFG_RX_HDR_SIZE)
642 hdr_len = eth_get_headlen(skb->dev,
643 aq_buf_vaddr(&buff->rxdata),
644 AQ_CFG_RX_HDR_SIZE);
645
646 memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
647 ALIGN(hdr_len, sizeof(long)));
648
649 if (buff->len - hdr_len > 0) {
650 skb_add_rx_frag(skb, i++, buff->rxdata.page,
651 buff->rxdata.pg_off + hdr_len,
652 buff->len - hdr_len,
653 self->frame_max);
654 page_ref_inc(buff->rxdata.page);
655 }
656
657 if (!buff->is_eop) {
658 buff_ = buff;
659 do {
660 next_ = buff_->next;
661 buff_ = &self->buff_ring[next_];
662
663 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
664 buff_->rxdata.daddr,
665 buff_->rxdata.pg_off,
666 buff_->len,
667 DMA_FROM_DEVICE);
668 skb_add_rx_frag(skb, i++,
669 buff_->rxdata.page,
670 buff_->rxdata.pg_off,
671 buff_->len,
672 self->frame_max);
673 page_ref_inc(buff_->rxdata.page);
674 buff_->is_cleaned = 1;
675
676 buff->is_ip_cso &= buff_->is_ip_cso;
677 buff->is_udp_cso &= buff_->is_udp_cso;
678 buff->is_tcp_cso &= buff_->is_tcp_cso;
679 buff->is_cso_err |= buff_->is_cso_err;
680
681 } while (!buff_->is_eop);
682 }
683
684 if (buff->is_vlan)
685 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
686 buff->vlan_rx_tag);
687
688 skb->protocol = eth_type_trans(skb, ndev);
689
690 aq_rx_checksum(self, buff, skb);
691
692 skb_set_hash(skb, buff->rss_hash,
693 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
694 PKT_HASH_TYPE_NONE);
695 /* Send all PTP traffic to 0 queue */
696 skb_record_rx_queue(skb,
697 is_ptp_ring ? 0
698 : AQ_NIC_RING2QMAP(self->aq_nic,
699 self->idx));
700
701 u64_stats_update_begin(&self->stats.rx.syncp);
702 ++self->stats.rx.packets;
703 self->stats.rx.bytes += skb->len;
704 u64_stats_update_end(&self->stats.rx.syncp);
705
706 napi_gro_receive(napi, skb);
707 }
708
709 err_exit:
710 return err;
711 }
712
__aq_ring_xdp_clean(struct aq_ring_s * rx_ring,struct napi_struct * napi,int * work_done,int budget)713 static int __aq_ring_xdp_clean(struct aq_ring_s *rx_ring,
714 struct napi_struct *napi, int *work_done,
715 int budget)
716 {
717 int frame_sz = rx_ring->page_offset + rx_ring->frame_max +
718 rx_ring->tail_size;
719 struct aq_nic_s *aq_nic = rx_ring->aq_nic;
720 bool is_rsc_completed = true;
721 struct device *dev;
722 int err = 0;
723
724 dev = aq_nic_get_dev(aq_nic);
725 for (; (rx_ring->sw_head != rx_ring->hw_head) && budget;
726 rx_ring->sw_head = aq_ring_next_dx(rx_ring, rx_ring->sw_head),
727 --budget, ++(*work_done)) {
728 struct aq_ring_buff_s *buff = &rx_ring->buff_ring[rx_ring->sw_head];
729 bool is_ptp_ring = aq_ptp_ring(rx_ring->aq_nic, rx_ring);
730 struct aq_ring_buff_s *buff_ = NULL;
731 struct sk_buff *skb = NULL;
732 unsigned int next_ = 0U;
733 struct xdp_buff xdp;
734 void *hard_start;
735
736 if (buff->is_cleaned)
737 continue;
738
739 if (!buff->is_eop) {
740 buff_ = buff;
741 do {
742 if (buff_->next >= rx_ring->size) {
743 err = -EIO;
744 goto err_exit;
745 }
746 next_ = buff_->next;
747 buff_ = &rx_ring->buff_ring[next_];
748 is_rsc_completed =
749 aq_ring_dx_in_range(rx_ring->sw_head,
750 next_,
751 rx_ring->hw_head);
752
753 if (unlikely(!is_rsc_completed))
754 break;
755
756 buff->is_error |= buff_->is_error;
757 buff->is_cso_err |= buff_->is_cso_err;
758 } while (!buff_->is_eop);
759
760 if (!is_rsc_completed) {
761 err = 0;
762 goto err_exit;
763 }
764 if (buff->is_error ||
765 (buff->is_lro && buff->is_cso_err)) {
766 buff_ = buff;
767 do {
768 if (buff_->next >= rx_ring->size) {
769 err = -EIO;
770 goto err_exit;
771 }
772 next_ = buff_->next;
773 buff_ = &rx_ring->buff_ring[next_];
774
775 buff_->is_cleaned = true;
776 } while (!buff_->is_eop);
777
778 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
779 ++rx_ring->stats.rx.errors;
780 u64_stats_update_end(&rx_ring->stats.rx.syncp);
781 continue;
782 }
783 }
784
785 if (buff->is_error) {
786 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
787 ++rx_ring->stats.rx.errors;
788 u64_stats_update_end(&rx_ring->stats.rx.syncp);
789 continue;
790 }
791
792 dma_sync_single_range_for_cpu(dev,
793 buff->rxdata.daddr,
794 buff->rxdata.pg_off,
795 buff->len, DMA_FROM_DEVICE);
796 hard_start = page_address(buff->rxdata.page) +
797 buff->rxdata.pg_off - rx_ring->page_offset;
798
799 if (is_ptp_ring)
800 buff->len -=
801 aq_ptp_extract_ts(rx_ring->aq_nic, skb,
802 aq_buf_vaddr(&buff->rxdata),
803 buff->len);
804
805 xdp_init_buff(&xdp, frame_sz, &rx_ring->xdp_rxq);
806 xdp_prepare_buff(&xdp, hard_start, rx_ring->page_offset,
807 buff->len, false);
808 if (!buff->is_eop) {
809 if (aq_add_rx_fragment(dev, rx_ring, buff, &xdp)) {
810 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
811 ++rx_ring->stats.rx.packets;
812 rx_ring->stats.rx.bytes += xdp_get_buff_len(&xdp);
813 ++rx_ring->stats.rx.xdp_aborted;
814 u64_stats_update_end(&rx_ring->stats.rx.syncp);
815 continue;
816 }
817 }
818
819 skb = aq_xdp_run_prog(aq_nic, &xdp, rx_ring, buff);
820 if (IS_ERR(skb) || !skb)
821 continue;
822
823 if (buff->is_vlan)
824 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
825 buff->vlan_rx_tag);
826
827 aq_rx_checksum(rx_ring, buff, skb);
828
829 skb_set_hash(skb, buff->rss_hash,
830 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
831 PKT_HASH_TYPE_NONE);
832 /* Send all PTP traffic to 0 queue */
833 skb_record_rx_queue(skb,
834 is_ptp_ring ? 0
835 : AQ_NIC_RING2QMAP(rx_ring->aq_nic,
836 rx_ring->idx));
837
838 napi_gro_receive(napi, skb);
839 }
840
841 err_exit:
842 return err;
843 }
844
aq_ring_rx_clean(struct aq_ring_s * self,struct napi_struct * napi,int * work_done,int budget)845 int aq_ring_rx_clean(struct aq_ring_s *self,
846 struct napi_struct *napi,
847 int *work_done,
848 int budget)
849 {
850 if (static_branch_unlikely(&aq_xdp_locking_key))
851 return __aq_ring_xdp_clean(self, napi, work_done, budget);
852 else
853 return __aq_ring_rx_clean(self, napi, work_done, budget);
854 }
855
aq_ring_hwts_rx_clean(struct aq_ring_s * self,struct aq_nic_s * aq_nic)856 void aq_ring_hwts_rx_clean(struct aq_ring_s *self, struct aq_nic_s *aq_nic)
857 {
858 #if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
859 while (self->sw_head != self->hw_head) {
860 u64 ns;
861
862 aq_nic->aq_hw_ops->extract_hwts(aq_nic->aq_hw,
863 self->dx_ring +
864 (self->sw_head * self->dx_size),
865 self->dx_size, &ns);
866 aq_ptp_tx_hwtstamp(aq_nic, ns);
867
868 self->sw_head = aq_ring_next_dx(self, self->sw_head);
869 }
870 #endif
871 }
872
aq_ring_rx_fill(struct aq_ring_s * self)873 int aq_ring_rx_fill(struct aq_ring_s *self)
874 {
875 struct aq_ring_buff_s *buff = NULL;
876 int err = 0;
877 int i = 0;
878
879 if (aq_ring_avail_dx(self) < min_t(unsigned int, AQ_CFG_RX_REFILL_THRES,
880 self->size / 2))
881 return err;
882
883 for (i = aq_ring_avail_dx(self); i--;
884 self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
885 buff = &self->buff_ring[self->sw_tail];
886
887 buff->flags = 0U;
888 buff->len = self->frame_max;
889
890 err = aq_get_rxpages(self, buff);
891 if (err)
892 goto err_exit;
893
894 buff->pa = aq_buf_daddr(&buff->rxdata);
895 buff = NULL;
896 }
897
898 err_exit:
899 return err;
900 }
901
aq_ring_rx_deinit(struct aq_ring_s * self)902 void aq_ring_rx_deinit(struct aq_ring_s *self)
903 {
904 if (!self)
905 return;
906
907 for (; self->sw_head != self->sw_tail;
908 self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
909 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
910
911 aq_free_rxpage(&buff->rxdata, aq_nic_get_dev(self->aq_nic));
912 }
913 }
914
aq_ring_free(struct aq_ring_s * self)915 void aq_ring_free(struct aq_ring_s *self)
916 {
917 if (!self)
918 return;
919
920 kfree(self->buff_ring);
921
922 if (self->dx_ring)
923 dma_free_coherent(aq_nic_get_dev(self->aq_nic),
924 self->size * self->dx_size, self->dx_ring,
925 self->dx_ring_pa);
926 }
927
aq_ring_fill_stats_data(struct aq_ring_s * self,u64 * data)928 unsigned int aq_ring_fill_stats_data(struct aq_ring_s *self, u64 *data)
929 {
930 unsigned int count;
931 unsigned int start;
932
933 if (self->ring_type == ATL_RING_RX) {
934 /* This data should mimic aq_ethtool_queue_rx_stat_names structure */
935 do {
936 count = 0;
937 start = u64_stats_fetch_begin_irq(&self->stats.rx.syncp);
938 data[count] = self->stats.rx.packets;
939 data[++count] = self->stats.rx.jumbo_packets;
940 data[++count] = self->stats.rx.lro_packets;
941 data[++count] = self->stats.rx.errors;
942 data[++count] = self->stats.rx.alloc_fails;
943 data[++count] = self->stats.rx.skb_alloc_fails;
944 data[++count] = self->stats.rx.polls;
945 data[++count] = self->stats.rx.pg_flips;
946 data[++count] = self->stats.rx.pg_reuses;
947 data[++count] = self->stats.rx.pg_losts;
948 data[++count] = self->stats.rx.xdp_aborted;
949 data[++count] = self->stats.rx.xdp_drop;
950 data[++count] = self->stats.rx.xdp_pass;
951 data[++count] = self->stats.rx.xdp_tx;
952 data[++count] = self->stats.rx.xdp_invalid;
953 data[++count] = self->stats.rx.xdp_redirect;
954 } while (u64_stats_fetch_retry_irq(&self->stats.rx.syncp, start));
955 } else {
956 /* This data should mimic aq_ethtool_queue_tx_stat_names structure */
957 do {
958 count = 0;
959 start = u64_stats_fetch_begin_irq(&self->stats.tx.syncp);
960 data[count] = self->stats.tx.packets;
961 data[++count] = self->stats.tx.queue_restarts;
962 } while (u64_stats_fetch_retry_irq(&self->stats.tx.syncp, start));
963 }
964
965 return ++count;
966 }
967