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_build_skb(struct xdp_buff * xdp,struct net_device * dev,struct aq_ring_buff_s * buff)415 static struct sk_buff *aq_xdp_build_skb(struct xdp_buff *xdp,
416 struct net_device *dev,
417 struct aq_ring_buff_s *buff)
418 {
419 struct xdp_frame *xdpf;
420 struct sk_buff *skb;
421
422 xdpf = xdp_convert_buff_to_frame(xdp);
423 if (unlikely(!xdpf))
424 return NULL;
425
426 skb = xdp_build_skb_from_frame(xdpf, dev);
427 if (!skb)
428 return NULL;
429
430 aq_get_rxpages_xdp(buff, xdp);
431 return skb;
432 }
433
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)434 static struct sk_buff *aq_xdp_run_prog(struct aq_nic_s *aq_nic,
435 struct xdp_buff *xdp,
436 struct aq_ring_s *rx_ring,
437 struct aq_ring_buff_s *buff)
438 {
439 int result = NETDEV_TX_BUSY;
440 struct aq_ring_s *tx_ring;
441 struct xdp_frame *xdpf;
442 struct bpf_prog *prog;
443 u32 act = XDP_ABORTED;
444 struct sk_buff *skb;
445
446 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
447 ++rx_ring->stats.rx.packets;
448 rx_ring->stats.rx.bytes += xdp_get_buff_len(xdp);
449 u64_stats_update_end(&rx_ring->stats.rx.syncp);
450
451 prog = READ_ONCE(rx_ring->xdp_prog);
452 if (!prog)
453 return aq_xdp_build_skb(xdp, aq_nic->ndev, buff);
454
455 prefetchw(xdp->data_hard_start); /* xdp_frame write */
456
457 /* single buffer XDP program, but packet is multi buffer, aborted */
458 if (xdp_buff_has_frags(xdp) && !prog->aux->xdp_has_frags)
459 goto out_aborted;
460
461 act = bpf_prog_run_xdp(prog, xdp);
462 switch (act) {
463 case XDP_PASS:
464 skb = aq_xdp_build_skb(xdp, aq_nic->ndev, buff);
465 if (!skb)
466 goto out_aborted;
467 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
468 ++rx_ring->stats.rx.xdp_pass;
469 u64_stats_update_end(&rx_ring->stats.rx.syncp);
470 return skb;
471 case XDP_TX:
472 xdpf = xdp_convert_buff_to_frame(xdp);
473 if (unlikely(!xdpf))
474 goto out_aborted;
475 tx_ring = aq_nic->aq_ring_tx[rx_ring->idx];
476 result = aq_nic_xmit_xdpf(aq_nic, tx_ring, xdpf);
477 if (result == NETDEV_TX_BUSY)
478 goto out_aborted;
479 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
480 ++rx_ring->stats.rx.xdp_tx;
481 u64_stats_update_end(&rx_ring->stats.rx.syncp);
482 aq_get_rxpages_xdp(buff, xdp);
483 break;
484 case XDP_REDIRECT:
485 if (xdp_do_redirect(aq_nic->ndev, xdp, prog) < 0)
486 goto out_aborted;
487 xdp_do_flush();
488 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
489 ++rx_ring->stats.rx.xdp_redirect;
490 u64_stats_update_end(&rx_ring->stats.rx.syncp);
491 aq_get_rxpages_xdp(buff, xdp);
492 break;
493 default:
494 fallthrough;
495 case XDP_ABORTED:
496 out_aborted:
497 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
498 ++rx_ring->stats.rx.xdp_aborted;
499 u64_stats_update_end(&rx_ring->stats.rx.syncp);
500 trace_xdp_exception(aq_nic->ndev, prog, act);
501 bpf_warn_invalid_xdp_action(aq_nic->ndev, prog, act);
502 break;
503 case XDP_DROP:
504 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
505 ++rx_ring->stats.rx.xdp_drop;
506 u64_stats_update_end(&rx_ring->stats.rx.syncp);
507 break;
508 }
509
510 return ERR_PTR(-result);
511 }
512
aq_add_rx_fragment(struct device * dev,struct aq_ring_s * ring,struct aq_ring_buff_s * buff,struct xdp_buff * xdp)513 static bool aq_add_rx_fragment(struct device *dev,
514 struct aq_ring_s *ring,
515 struct aq_ring_buff_s *buff,
516 struct xdp_buff *xdp)
517 {
518 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
519 struct aq_ring_buff_s *buff_ = buff;
520
521 memset(sinfo, 0, sizeof(*sinfo));
522 do {
523 skb_frag_t *frag;
524
525 if (unlikely(sinfo->nr_frags >= MAX_SKB_FRAGS))
526 return true;
527
528 frag = &sinfo->frags[sinfo->nr_frags++];
529 buff_ = &ring->buff_ring[buff_->next];
530 dma_sync_single_range_for_cpu(dev,
531 buff_->rxdata.daddr,
532 buff_->rxdata.pg_off,
533 buff_->len,
534 DMA_FROM_DEVICE);
535 sinfo->xdp_frags_size += buff_->len;
536 skb_frag_fill_page_desc(frag, buff_->rxdata.page,
537 buff_->rxdata.pg_off,
538 buff_->len);
539
540 buff_->is_cleaned = 1;
541
542 buff->is_ip_cso &= buff_->is_ip_cso;
543 buff->is_udp_cso &= buff_->is_udp_cso;
544 buff->is_tcp_cso &= buff_->is_tcp_cso;
545 buff->is_cso_err |= buff_->is_cso_err;
546
547 if (page_is_pfmemalloc(buff_->rxdata.page))
548 xdp_buff_set_frag_pfmemalloc(xdp);
549
550 } while (!buff_->is_eop);
551
552 xdp_buff_set_frags_flag(xdp);
553
554 return false;
555 }
556
__aq_ring_rx_clean(struct aq_ring_s * self,struct napi_struct * napi,int * work_done,int budget)557 static int __aq_ring_rx_clean(struct aq_ring_s *self, struct napi_struct *napi,
558 int *work_done, int budget)
559 {
560 struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
561 int err = 0;
562
563 for (; (self->sw_head != self->hw_head) && budget;
564 self->sw_head = aq_ring_next_dx(self, self->sw_head),
565 --budget, ++(*work_done)) {
566 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
567 bool is_ptp_ring = aq_ptp_ring(self->aq_nic, self);
568 struct aq_ring_buff_s *buff_ = NULL;
569 struct sk_buff *skb = NULL;
570 unsigned int next_ = 0U;
571 unsigned int i = 0U;
572 u16 hdr_len;
573
574 if (buff->is_cleaned)
575 continue;
576
577 if (!buff->is_eop) {
578 unsigned int frag_cnt = 0U;
579 buff_ = buff;
580 do {
581 bool is_rsc_completed = true;
582
583 if (buff_->next >= self->size) {
584 err = -EIO;
585 goto err_exit;
586 }
587
588 frag_cnt++;
589 next_ = buff_->next,
590 buff_ = &self->buff_ring[next_];
591 is_rsc_completed =
592 aq_ring_dx_in_range(self->sw_head,
593 next_,
594 self->hw_head);
595
596 if (unlikely(!is_rsc_completed) ||
597 frag_cnt > MAX_SKB_FRAGS) {
598 err = 0;
599 goto err_exit;
600 }
601
602 buff->is_error |= buff_->is_error;
603 buff->is_cso_err |= buff_->is_cso_err;
604
605 } while (!buff_->is_eop);
606
607 if (buff->is_error ||
608 (buff->is_lro && buff->is_cso_err)) {
609 buff_ = buff;
610 do {
611 if (buff_->next >= self->size) {
612 err = -EIO;
613 goto err_exit;
614 }
615 next_ = buff_->next,
616 buff_ = &self->buff_ring[next_];
617
618 buff_->is_cleaned = true;
619 } while (!buff_->is_eop);
620
621 u64_stats_update_begin(&self->stats.rx.syncp);
622 ++self->stats.rx.errors;
623 u64_stats_update_end(&self->stats.rx.syncp);
624 continue;
625 }
626 }
627
628 if (buff->is_error) {
629 u64_stats_update_begin(&self->stats.rx.syncp);
630 ++self->stats.rx.errors;
631 u64_stats_update_end(&self->stats.rx.syncp);
632 continue;
633 }
634
635 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
636 buff->rxdata.daddr,
637 buff->rxdata.pg_off,
638 buff->len, DMA_FROM_DEVICE);
639
640 skb = napi_alloc_skb(napi, AQ_CFG_RX_HDR_SIZE);
641 if (unlikely(!skb)) {
642 u64_stats_update_begin(&self->stats.rx.syncp);
643 self->stats.rx.skb_alloc_fails++;
644 u64_stats_update_end(&self->stats.rx.syncp);
645 err = -ENOMEM;
646 goto err_exit;
647 }
648 if (is_ptp_ring)
649 buff->len -=
650 aq_ptp_extract_ts(self->aq_nic, skb,
651 aq_buf_vaddr(&buff->rxdata),
652 buff->len);
653
654 hdr_len = buff->len;
655 if (hdr_len > AQ_CFG_RX_HDR_SIZE)
656 hdr_len = eth_get_headlen(skb->dev,
657 aq_buf_vaddr(&buff->rxdata),
658 AQ_CFG_RX_HDR_SIZE);
659
660 memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
661 ALIGN(hdr_len, sizeof(long)));
662
663 if (buff->len - hdr_len > 0) {
664 skb_add_rx_frag(skb, i++, buff->rxdata.page,
665 buff->rxdata.pg_off + hdr_len,
666 buff->len - hdr_len,
667 self->frame_max);
668 page_ref_inc(buff->rxdata.page);
669 }
670
671 if (!buff->is_eop) {
672 buff_ = buff;
673 do {
674 next_ = buff_->next;
675 buff_ = &self->buff_ring[next_];
676
677 dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
678 buff_->rxdata.daddr,
679 buff_->rxdata.pg_off,
680 buff_->len,
681 DMA_FROM_DEVICE);
682 skb_add_rx_frag(skb, i++,
683 buff_->rxdata.page,
684 buff_->rxdata.pg_off,
685 buff_->len,
686 self->frame_max);
687 page_ref_inc(buff_->rxdata.page);
688 buff_->is_cleaned = 1;
689
690 buff->is_ip_cso &= buff_->is_ip_cso;
691 buff->is_udp_cso &= buff_->is_udp_cso;
692 buff->is_tcp_cso &= buff_->is_tcp_cso;
693 buff->is_cso_err |= buff_->is_cso_err;
694
695 } while (!buff_->is_eop);
696 }
697
698 if (buff->is_vlan)
699 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
700 buff->vlan_rx_tag);
701
702 skb->protocol = eth_type_trans(skb, ndev);
703
704 aq_rx_checksum(self, buff, skb);
705
706 skb_set_hash(skb, buff->rss_hash,
707 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
708 PKT_HASH_TYPE_NONE);
709 /* Send all PTP traffic to 0 queue */
710 skb_record_rx_queue(skb,
711 is_ptp_ring ? 0
712 : AQ_NIC_RING2QMAP(self->aq_nic,
713 self->idx));
714
715 u64_stats_update_begin(&self->stats.rx.syncp);
716 ++self->stats.rx.packets;
717 self->stats.rx.bytes += skb->len;
718 u64_stats_update_end(&self->stats.rx.syncp);
719
720 napi_gro_receive(napi, skb);
721 }
722
723 err_exit:
724 return err;
725 }
726
__aq_ring_xdp_clean(struct aq_ring_s * rx_ring,struct napi_struct * napi,int * work_done,int budget)727 static int __aq_ring_xdp_clean(struct aq_ring_s *rx_ring,
728 struct napi_struct *napi, int *work_done,
729 int budget)
730 {
731 int frame_sz = rx_ring->page_offset + rx_ring->frame_max +
732 rx_ring->tail_size;
733 struct aq_nic_s *aq_nic = rx_ring->aq_nic;
734 bool is_rsc_completed = true;
735 struct device *dev;
736 int err = 0;
737
738 dev = aq_nic_get_dev(aq_nic);
739 for (; (rx_ring->sw_head != rx_ring->hw_head) && budget;
740 rx_ring->sw_head = aq_ring_next_dx(rx_ring, rx_ring->sw_head),
741 --budget, ++(*work_done)) {
742 struct aq_ring_buff_s *buff = &rx_ring->buff_ring[rx_ring->sw_head];
743 bool is_ptp_ring = aq_ptp_ring(rx_ring->aq_nic, rx_ring);
744 struct aq_ring_buff_s *buff_ = NULL;
745 struct sk_buff *skb = NULL;
746 unsigned int next_ = 0U;
747 struct xdp_buff xdp;
748 void *hard_start;
749
750 if (buff->is_cleaned)
751 continue;
752
753 if (!buff->is_eop) {
754 buff_ = buff;
755 do {
756 if (buff_->next >= rx_ring->size) {
757 err = -EIO;
758 goto err_exit;
759 }
760 next_ = buff_->next;
761 buff_ = &rx_ring->buff_ring[next_];
762 is_rsc_completed =
763 aq_ring_dx_in_range(rx_ring->sw_head,
764 next_,
765 rx_ring->hw_head);
766
767 if (unlikely(!is_rsc_completed))
768 break;
769
770 buff->is_error |= buff_->is_error;
771 buff->is_cso_err |= buff_->is_cso_err;
772 } while (!buff_->is_eop);
773
774 if (!is_rsc_completed) {
775 err = 0;
776 goto err_exit;
777 }
778 if (buff->is_error ||
779 (buff->is_lro && buff->is_cso_err)) {
780 buff_ = buff;
781 do {
782 if (buff_->next >= rx_ring->size) {
783 err = -EIO;
784 goto err_exit;
785 }
786 next_ = buff_->next;
787 buff_ = &rx_ring->buff_ring[next_];
788
789 buff_->is_cleaned = true;
790 } while (!buff_->is_eop);
791
792 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
793 ++rx_ring->stats.rx.errors;
794 u64_stats_update_end(&rx_ring->stats.rx.syncp);
795 continue;
796 }
797 }
798
799 if (buff->is_error) {
800 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
801 ++rx_ring->stats.rx.errors;
802 u64_stats_update_end(&rx_ring->stats.rx.syncp);
803 continue;
804 }
805
806 dma_sync_single_range_for_cpu(dev,
807 buff->rxdata.daddr,
808 buff->rxdata.pg_off,
809 buff->len, DMA_FROM_DEVICE);
810 hard_start = page_address(buff->rxdata.page) +
811 buff->rxdata.pg_off - rx_ring->page_offset;
812
813 if (is_ptp_ring)
814 buff->len -=
815 aq_ptp_extract_ts(rx_ring->aq_nic, skb,
816 aq_buf_vaddr(&buff->rxdata),
817 buff->len);
818
819 xdp_init_buff(&xdp, frame_sz, &rx_ring->xdp_rxq);
820 xdp_prepare_buff(&xdp, hard_start, rx_ring->page_offset,
821 buff->len, false);
822 if (!buff->is_eop) {
823 if (aq_add_rx_fragment(dev, rx_ring, buff, &xdp)) {
824 u64_stats_update_begin(&rx_ring->stats.rx.syncp);
825 ++rx_ring->stats.rx.packets;
826 rx_ring->stats.rx.bytes += xdp_get_buff_len(&xdp);
827 ++rx_ring->stats.rx.xdp_aborted;
828 u64_stats_update_end(&rx_ring->stats.rx.syncp);
829 continue;
830 }
831 }
832
833 skb = aq_xdp_run_prog(aq_nic, &xdp, rx_ring, buff);
834 if (IS_ERR(skb) || !skb)
835 continue;
836
837 if (buff->is_vlan)
838 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
839 buff->vlan_rx_tag);
840
841 aq_rx_checksum(rx_ring, buff, skb);
842
843 skb_set_hash(skb, buff->rss_hash,
844 buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
845 PKT_HASH_TYPE_NONE);
846 /* Send all PTP traffic to 0 queue */
847 skb_record_rx_queue(skb,
848 is_ptp_ring ? 0
849 : AQ_NIC_RING2QMAP(rx_ring->aq_nic,
850 rx_ring->idx));
851
852 napi_gro_receive(napi, skb);
853 }
854
855 err_exit:
856 return err;
857 }
858
aq_ring_rx_clean(struct aq_ring_s * self,struct napi_struct * napi,int * work_done,int budget)859 int aq_ring_rx_clean(struct aq_ring_s *self,
860 struct napi_struct *napi,
861 int *work_done,
862 int budget)
863 {
864 if (static_branch_unlikely(&aq_xdp_locking_key))
865 return __aq_ring_xdp_clean(self, napi, work_done, budget);
866 else
867 return __aq_ring_rx_clean(self, napi, work_done, budget);
868 }
869
aq_ring_hwts_rx_clean(struct aq_ring_s * self,struct aq_nic_s * aq_nic)870 void aq_ring_hwts_rx_clean(struct aq_ring_s *self, struct aq_nic_s *aq_nic)
871 {
872 #if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
873 while (self->sw_head != self->hw_head) {
874 u64 ns;
875
876 aq_nic->aq_hw_ops->extract_hwts(aq_nic->aq_hw,
877 self->dx_ring +
878 (self->sw_head * self->dx_size),
879 self->dx_size, &ns);
880 aq_ptp_tx_hwtstamp(aq_nic, ns);
881
882 self->sw_head = aq_ring_next_dx(self, self->sw_head);
883 }
884 #endif
885 }
886
aq_ring_rx_fill(struct aq_ring_s * self)887 int aq_ring_rx_fill(struct aq_ring_s *self)
888 {
889 struct aq_ring_buff_s *buff = NULL;
890 int err = 0;
891 int i = 0;
892
893 if (aq_ring_avail_dx(self) < min_t(unsigned int, AQ_CFG_RX_REFILL_THRES,
894 self->size / 2))
895 return err;
896
897 for (i = aq_ring_avail_dx(self); i--;
898 self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
899 buff = &self->buff_ring[self->sw_tail];
900
901 buff->flags = 0U;
902 buff->len = self->frame_max;
903
904 err = aq_get_rxpages(self, buff);
905 if (err)
906 goto err_exit;
907
908 buff->pa = aq_buf_daddr(&buff->rxdata);
909 buff = NULL;
910 }
911
912 err_exit:
913 return err;
914 }
915
aq_ring_rx_deinit(struct aq_ring_s * self)916 void aq_ring_rx_deinit(struct aq_ring_s *self)
917 {
918 if (!self)
919 return;
920
921 for (; self->sw_head != self->sw_tail;
922 self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
923 struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
924
925 aq_free_rxpage(&buff->rxdata, aq_nic_get_dev(self->aq_nic));
926 }
927 }
928
aq_ring_free(struct aq_ring_s * self)929 void aq_ring_free(struct aq_ring_s *self)
930 {
931 if (!self)
932 return;
933
934 kfree(self->buff_ring);
935
936 if (self->dx_ring)
937 dma_free_coherent(aq_nic_get_dev(self->aq_nic),
938 self->size * self->dx_size, self->dx_ring,
939 self->dx_ring_pa);
940 }
941
aq_ring_fill_stats_data(struct aq_ring_s * self,u64 * data)942 unsigned int aq_ring_fill_stats_data(struct aq_ring_s *self, u64 *data)
943 {
944 unsigned int count;
945 unsigned int start;
946
947 if (self->ring_type == ATL_RING_RX) {
948 /* This data should mimic aq_ethtool_queue_rx_stat_names structure */
949 do {
950 count = 0;
951 start = u64_stats_fetch_begin(&self->stats.rx.syncp);
952 data[count] = self->stats.rx.packets;
953 data[++count] = self->stats.rx.jumbo_packets;
954 data[++count] = self->stats.rx.lro_packets;
955 data[++count] = self->stats.rx.errors;
956 data[++count] = self->stats.rx.alloc_fails;
957 data[++count] = self->stats.rx.skb_alloc_fails;
958 data[++count] = self->stats.rx.polls;
959 data[++count] = self->stats.rx.pg_flips;
960 data[++count] = self->stats.rx.pg_reuses;
961 data[++count] = self->stats.rx.pg_losts;
962 data[++count] = self->stats.rx.xdp_aborted;
963 data[++count] = self->stats.rx.xdp_drop;
964 data[++count] = self->stats.rx.xdp_pass;
965 data[++count] = self->stats.rx.xdp_tx;
966 data[++count] = self->stats.rx.xdp_invalid;
967 data[++count] = self->stats.rx.xdp_redirect;
968 } while (u64_stats_fetch_retry(&self->stats.rx.syncp, start));
969 } else {
970 /* This data should mimic aq_ethtool_queue_tx_stat_names structure */
971 do {
972 count = 0;
973 start = u64_stats_fetch_begin(&self->stats.tx.syncp);
974 data[count] = self->stats.tx.packets;
975 data[++count] = self->stats.tx.queue_restarts;
976 } while (u64_stats_fetch_retry(&self->stats.tx.syncp, start));
977 }
978
979 return ++count;
980 }
981
