xref: /linux/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c (revision ab93e0dd72c37d378dd936f031ffb83ff2bd87ce)
1 // SPDX-License-Identifier: GPL-2.0
2 /* Marvell RVU Ethernet driver
3  *
4  * Copyright (C) 2020 Marvell.
5  *
6  */
7 
8 #include <linux/etherdevice.h>
9 #include <net/ip.h>
10 #include <net/tso.h>
11 #include <linux/bpf.h>
12 #include <linux/bpf_trace.h>
13 #include <net/ip6_checksum.h>
14 #include <net/xfrm.h>
15 #include <net/xdp.h>
16 
17 #include "otx2_reg.h"
18 #include "otx2_common.h"
19 #include "otx2_struct.h"
20 #include "otx2_txrx.h"
21 #include "otx2_ptp.h"
22 #include "cn10k.h"
23 #include "otx2_xsk.h"
24 
25 #define CQE_ADDR(CQ, idx) ((CQ)->cqe_base + ((CQ)->cqe_size * (idx)))
26 #define PTP_PORT	        0x13F
27 /* PTPv2 header Original Timestamp starts at byte offset 34 and
28  * contains 6 byte seconds field and 4 byte nano seconds field.
29  */
30 #define PTP_SYNC_SEC_OFFSET	34
31 
32 DEFINE_STATIC_KEY_FALSE(cn10k_ipsec_sa_enabled);
33 
otx2_get_free_sqe(struct otx2_snd_queue * sq)34 static int otx2_get_free_sqe(struct otx2_snd_queue *sq)
35 {
36 	return (sq->cons_head - sq->head - 1 + sq->sqe_cnt)
37 		& (sq->sqe_cnt - 1);
38 }
39 
40 static bool otx2_xdp_rcv_pkt_handler(struct otx2_nic *pfvf,
41 				     struct bpf_prog *prog,
42 				     struct nix_cqe_rx_s *cqe,
43 				     struct otx2_cq_queue *cq,
44 				     u32 *metasize, bool *need_xdp_flush);
45 
otx2_sq_set_sqe_base(struct otx2_snd_queue * sq,struct sk_buff * skb)46 static void otx2_sq_set_sqe_base(struct otx2_snd_queue *sq,
47 				 struct sk_buff *skb)
48 {
49 	if (static_branch_unlikely(&cn10k_ipsec_sa_enabled) &&
50 	    (xfrm_offload(skb)))
51 		sq->sqe_base = sq->sqe_ring->base + sq->sqe_size +
52 				(sq->head * (sq->sqe_size * 2));
53 	else
54 		sq->sqe_base = sq->sqe->base;
55 }
56 
otx2_nix_cq_op_status(struct otx2_nic * pfvf,struct otx2_cq_queue * cq)57 static int otx2_nix_cq_op_status(struct otx2_nic *pfvf,
58 				 struct otx2_cq_queue *cq)
59 {
60 	u64 incr = (u64)(cq->cq_idx) << 32;
61 	u64 status;
62 
63 	status = otx2_atomic64_fetch_add(incr, pfvf->cq_op_addr);
64 
65 	if (unlikely(status & BIT_ULL(CQ_OP_STAT_OP_ERR) ||
66 		     status & BIT_ULL(CQ_OP_STAT_CQ_ERR))) {
67 		dev_err(pfvf->dev, "CQ stopped due to error");
68 		return -EINVAL;
69 	}
70 
71 	cq->cq_tail = status & 0xFFFFF;
72 	cq->cq_head = (status >> 20) & 0xFFFFF;
73 	if (cq->cq_tail < cq->cq_head)
74 		cq->pend_cqe = (cq->cqe_cnt - cq->cq_head) +
75 				cq->cq_tail;
76 	else
77 		cq->pend_cqe = cq->cq_tail - cq->cq_head;
78 
79 	return 0;
80 }
81 
otx2_get_next_cqe(struct otx2_cq_queue * cq)82 static struct nix_cqe_hdr_s *otx2_get_next_cqe(struct otx2_cq_queue *cq)
83 {
84 	struct nix_cqe_hdr_s *cqe_hdr;
85 
86 	cqe_hdr = (struct nix_cqe_hdr_s *)CQE_ADDR(cq, cq->cq_head);
87 	if (cqe_hdr->cqe_type == NIX_XQE_TYPE_INVALID)
88 		return NULL;
89 
90 	cq->cq_head++;
91 	cq->cq_head &= (cq->cqe_cnt - 1);
92 
93 	return cqe_hdr;
94 }
95 
frag_num(unsigned int i)96 static unsigned int frag_num(unsigned int i)
97 {
98 #ifdef __BIG_ENDIAN
99 	return (i & ~3) + 3 - (i & 3);
100 #else
101 	return i;
102 #endif
103 }
104 
otx2_xdp_snd_pkt_handler(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct nix_cqe_tx_s * cqe,int * xsk_frames)105 static void otx2_xdp_snd_pkt_handler(struct otx2_nic *pfvf,
106 				     struct otx2_snd_queue *sq,
107 				     struct nix_cqe_tx_s *cqe,
108 				     int *xsk_frames)
109 {
110 	struct nix_send_comp_s *snd_comp = &cqe->comp;
111 	struct sg_list *sg;
112 
113 	sg = &sq->sg[snd_comp->sqe_id];
114 	if (sg->flags & OTX2_AF_XDP_FRAME) {
115 		(*xsk_frames)++;
116 		return;
117 	}
118 
119 	if (sg->flags & OTX2_XDP_REDIRECT)
120 		otx2_dma_unmap_page(pfvf, sg->dma_addr[0], sg->size[0], DMA_TO_DEVICE);
121 	xdp_return_frame((struct xdp_frame *)sg->skb);
122 	sg->skb = (u64)NULL;
123 }
124 
otx2_snd_pkt_handler(struct otx2_nic * pfvf,struct otx2_cq_queue * cq,struct otx2_snd_queue * sq,struct nix_cqe_tx_s * cqe,int budget,int * tx_pkts,int * tx_bytes)125 static void otx2_snd_pkt_handler(struct otx2_nic *pfvf,
126 				 struct otx2_cq_queue *cq,
127 				 struct otx2_snd_queue *sq,
128 				 struct nix_cqe_tx_s *cqe,
129 				 int budget, int *tx_pkts, int *tx_bytes)
130 {
131 	struct nix_send_comp_s *snd_comp = &cqe->comp;
132 	struct skb_shared_hwtstamps ts;
133 	struct sk_buff *skb = NULL;
134 	u64 timestamp, tsns;
135 	struct sg_list *sg;
136 	int err;
137 
138 	if (unlikely(snd_comp->status) && netif_msg_tx_err(pfvf))
139 		net_err_ratelimited("%s: TX%d: Error in send CQ status:%x\n",
140 				    pfvf->netdev->name, cq->cint_idx,
141 				    snd_comp->status);
142 
143 	sg = &sq->sg[snd_comp->sqe_id];
144 	skb = (struct sk_buff *)sg->skb;
145 	if (unlikely(!skb))
146 		return;
147 
148 	if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS) {
149 		timestamp = ((u64 *)sq->timestamps->base)[snd_comp->sqe_id];
150 		if (timestamp != 1) {
151 			timestamp = pfvf->ptp->convert_tx_ptp_tstmp(timestamp);
152 			err = otx2_ptp_tstamp2time(pfvf, timestamp, &tsns);
153 			if (!err) {
154 				memset(&ts, 0, sizeof(ts));
155 				ts.hwtstamp = ns_to_ktime(tsns);
156 				skb_tstamp_tx(skb, &ts);
157 			}
158 		}
159 	}
160 
161 	*tx_bytes += skb->len;
162 	(*tx_pkts)++;
163 	otx2_dma_unmap_skb_frags(pfvf, sg);
164 	napi_consume_skb(skb, budget);
165 	sg->skb = (u64)NULL;
166 }
167 
otx2_set_rxtstamp(struct otx2_nic * pfvf,struct sk_buff * skb,void * data)168 static void otx2_set_rxtstamp(struct otx2_nic *pfvf,
169 			      struct sk_buff *skb, void *data)
170 {
171 	u64 timestamp, tsns;
172 	int err;
173 
174 	if (!(pfvf->flags & OTX2_FLAG_RX_TSTAMP_ENABLED))
175 		return;
176 
177 	timestamp = pfvf->ptp->convert_rx_ptp_tstmp(*(u64 *)data);
178 	/* The first 8 bytes is the timestamp */
179 	err = otx2_ptp_tstamp2time(pfvf, timestamp, &tsns);
180 	if (err)
181 		return;
182 
183 	skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(tsns);
184 }
185 
otx2_skb_add_frag(struct otx2_nic * pfvf,struct sk_buff * skb,u64 iova,int len,struct nix_rx_parse_s * parse,int qidx)186 static bool otx2_skb_add_frag(struct otx2_nic *pfvf, struct sk_buff *skb,
187 			      u64 iova, int len, struct nix_rx_parse_s *parse,
188 			      int qidx)
189 {
190 	struct page *page;
191 	int off = 0;
192 	void *va;
193 
194 	va = phys_to_virt(otx2_iova_to_phys(pfvf->iommu_domain, iova));
195 
196 	if (likely(!skb_shinfo(skb)->nr_frags)) {
197 		/* Check if data starts at some nonzero offset
198 		 * from the start of the buffer.  For now the
199 		 * only possible offset is 8 bytes in the case
200 		 * where packet is prepended by a timestamp.
201 		 */
202 		if (parse->laptr) {
203 			otx2_set_rxtstamp(pfvf, skb, va);
204 			off = OTX2_HW_TIMESTAMP_LEN;
205 		}
206 	}
207 
208 	page = virt_to_page(va);
209 	if (likely(skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)) {
210 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
211 				va - page_address(page) + off,
212 				len - off, pfvf->rbsize);
213 		return true;
214 	}
215 
216 	/* If more than MAX_SKB_FRAGS fragments are received then
217 	 * give back those buffer pointers to hardware for reuse.
218 	 */
219 	pfvf->hw_ops->aura_freeptr(pfvf, qidx, iova & ~0x07ULL);
220 
221 	return false;
222 }
223 
otx2_set_rxhash(struct otx2_nic * pfvf,struct nix_cqe_rx_s * cqe,struct sk_buff * skb)224 static void otx2_set_rxhash(struct otx2_nic *pfvf,
225 			    struct nix_cqe_rx_s *cqe, struct sk_buff *skb)
226 {
227 	enum pkt_hash_types hash_type = PKT_HASH_TYPE_NONE;
228 	struct otx2_rss_info *rss;
229 	u32 hash = 0;
230 
231 	if (!(pfvf->netdev->features & NETIF_F_RXHASH))
232 		return;
233 
234 	rss = &pfvf->hw.rss_info;
235 	if (rss->flowkey_cfg) {
236 		if (rss->flowkey_cfg &
237 		    ~(NIX_FLOW_KEY_TYPE_IPV4 | NIX_FLOW_KEY_TYPE_IPV6))
238 			hash_type = PKT_HASH_TYPE_L4;
239 		else
240 			hash_type = PKT_HASH_TYPE_L3;
241 		hash = cqe->hdr.flow_tag;
242 	}
243 	skb_set_hash(skb, hash, hash_type);
244 }
245 
otx2_free_rcv_seg(struct otx2_nic * pfvf,struct nix_cqe_rx_s * cqe,int qidx)246 static void otx2_free_rcv_seg(struct otx2_nic *pfvf, struct nix_cqe_rx_s *cqe,
247 			      int qidx)
248 {
249 	struct nix_rx_sg_s *sg = &cqe->sg;
250 	void *end, *start;
251 	u64 *seg_addr;
252 	int seg;
253 
254 	start = (void *)sg;
255 	end = start + ((cqe->parse.desc_sizem1 + 1) * 16);
256 	while (start < end) {
257 		sg = (struct nix_rx_sg_s *)start;
258 		seg_addr = &sg->seg_addr;
259 		for (seg = 0; seg < sg->segs; seg++, seg_addr++)
260 			pfvf->hw_ops->aura_freeptr(pfvf, qidx,
261 						   *seg_addr & ~0x07ULL);
262 		start += sizeof(*sg);
263 	}
264 }
265 
otx2_check_rcv_errors(struct otx2_nic * pfvf,struct nix_cqe_rx_s * cqe,int qidx)266 static bool otx2_check_rcv_errors(struct otx2_nic *pfvf,
267 				  struct nix_cqe_rx_s *cqe, int qidx)
268 {
269 	struct otx2_drv_stats *stats = &pfvf->hw.drv_stats;
270 	struct nix_rx_parse_s *parse = &cqe->parse;
271 
272 	if (netif_msg_rx_err(pfvf))
273 		netdev_err(pfvf->netdev,
274 			   "RQ%d: Error pkt with errlev:0x%x errcode:0x%x\n",
275 			   qidx, parse->errlev, parse->errcode);
276 
277 	if (parse->errlev == NPC_ERRLVL_RE) {
278 		switch (parse->errcode) {
279 		case ERRCODE_FCS:
280 		case ERRCODE_FCS_RCV:
281 			atomic_inc(&stats->rx_fcs_errs);
282 			break;
283 		case ERRCODE_UNDERSIZE:
284 			atomic_inc(&stats->rx_undersize_errs);
285 			break;
286 		case ERRCODE_OVERSIZE:
287 			atomic_inc(&stats->rx_oversize_errs);
288 			break;
289 		case ERRCODE_OL2_LEN_MISMATCH:
290 			atomic_inc(&stats->rx_len_errs);
291 			break;
292 		default:
293 			atomic_inc(&stats->rx_other_errs);
294 			break;
295 		}
296 	} else if (parse->errlev == NPC_ERRLVL_NIX) {
297 		switch (parse->errcode) {
298 		case ERRCODE_OL3_LEN:
299 		case ERRCODE_OL4_LEN:
300 		case ERRCODE_IL3_LEN:
301 		case ERRCODE_IL4_LEN:
302 			atomic_inc(&stats->rx_len_errs);
303 			break;
304 		case ERRCODE_OL4_CSUM:
305 		case ERRCODE_IL4_CSUM:
306 			atomic_inc(&stats->rx_csum_errs);
307 			break;
308 		default:
309 			atomic_inc(&stats->rx_other_errs);
310 			break;
311 		}
312 	} else {
313 		atomic_inc(&stats->rx_other_errs);
314 		/* For now ignore all the NPC parser errors and
315 		 * pass the packets to stack.
316 		 */
317 		return false;
318 	}
319 
320 	/* If RXALL is enabled pass on packets to stack. */
321 	if (pfvf->netdev->features & NETIF_F_RXALL)
322 		return false;
323 
324 	/* Free buffer back to pool */
325 	if (cqe->sg.segs)
326 		otx2_free_rcv_seg(pfvf, cqe, qidx);
327 	return true;
328 }
329 
otx2_rcv_pkt_handler(struct otx2_nic * pfvf,struct napi_struct * napi,struct otx2_cq_queue * cq,struct nix_cqe_rx_s * cqe,bool * need_xdp_flush)330 static void otx2_rcv_pkt_handler(struct otx2_nic *pfvf,
331 				 struct napi_struct *napi,
332 				 struct otx2_cq_queue *cq,
333 				 struct nix_cqe_rx_s *cqe, bool *need_xdp_flush)
334 {
335 	struct nix_rx_parse_s *parse = &cqe->parse;
336 	struct nix_rx_sg_s *sg = &cqe->sg;
337 	struct sk_buff *skb = NULL;
338 	u64 *word = (u64 *)parse;
339 	void *end, *start;
340 	u32 metasize = 0;
341 	u64 *seg_addr;
342 	u16 *seg_size;
343 	int seg;
344 
345 	if (unlikely(parse->errlev || parse->errcode)) {
346 		if (otx2_check_rcv_errors(pfvf, cqe, cq->cq_idx)) {
347 			trace_otx2_parse_dump(pfvf->pdev, "Err:", word);
348 			return;
349 		}
350 	}
351 	trace_otx2_parse_dump(pfvf->pdev, "", word);
352 
353 	if (pfvf->xdp_prog)
354 		if (otx2_xdp_rcv_pkt_handler(pfvf, pfvf->xdp_prog, cqe, cq,
355 					     &metasize, need_xdp_flush))
356 			return;
357 
358 	skb = napi_get_frags(napi);
359 	if (unlikely(!skb))
360 		return;
361 
362 	start = (void *)sg;
363 	end = start + ((cqe->parse.desc_sizem1 + 1) * 16);
364 	while (start < end) {
365 		sg = (struct nix_rx_sg_s *)start;
366 		seg_addr = &sg->seg_addr;
367 		seg_size = (void *)sg;
368 		for (seg = 0; seg < sg->segs; seg++, seg_addr++) {
369 			if (otx2_skb_add_frag(pfvf, skb, *seg_addr,
370 					      seg_size[seg], parse, cq->cq_idx))
371 				cq->pool_ptrs++;
372 		}
373 		start += sizeof(*sg);
374 	}
375 	otx2_set_rxhash(pfvf, cqe, skb);
376 
377 	if (!(pfvf->flags & OTX2_FLAG_REP_MODE_ENABLED)) {
378 		skb_record_rx_queue(skb, cq->cq_idx);
379 		if (pfvf->netdev->features & NETIF_F_RXCSUM)
380 			skb->ip_summed = CHECKSUM_UNNECESSARY;
381 	}
382 
383 	if (pfvf->flags & OTX2_FLAG_TC_MARK_ENABLED)
384 		skb->mark = parse->match_id;
385 
386 	skb_mark_for_recycle(skb);
387 	if (metasize)
388 		skb_metadata_set(skb, metasize);
389 
390 	napi_gro_frags(napi);
391 }
392 
otx2_rx_napi_handler(struct otx2_nic * pfvf,struct napi_struct * napi,struct otx2_cq_queue * cq,int budget)393 static int otx2_rx_napi_handler(struct otx2_nic *pfvf,
394 				struct napi_struct *napi,
395 				struct otx2_cq_queue *cq, int budget)
396 {
397 	bool need_xdp_flush = false;
398 	struct nix_cqe_rx_s *cqe;
399 	int processed_cqe = 0;
400 
401 	if (cq->pend_cqe >= budget)
402 		goto process_cqe;
403 
404 	if (otx2_nix_cq_op_status(pfvf, cq) || !cq->pend_cqe)
405 		return 0;
406 
407 process_cqe:
408 	while (likely(processed_cqe < budget) && cq->pend_cqe) {
409 		cqe = (struct nix_cqe_rx_s *)CQE_ADDR(cq, cq->cq_head);
410 		if (cqe->hdr.cqe_type == NIX_XQE_TYPE_INVALID ||
411 		    !cqe->sg.seg_addr) {
412 			if (!processed_cqe)
413 				return 0;
414 			break;
415 		}
416 		cq->cq_head++;
417 		cq->cq_head &= (cq->cqe_cnt - 1);
418 
419 		otx2_rcv_pkt_handler(pfvf, napi, cq, cqe, &need_xdp_flush);
420 
421 		cqe->hdr.cqe_type = NIX_XQE_TYPE_INVALID;
422 		cqe->sg.seg_addr = 0x00;
423 		processed_cqe++;
424 		cq->pend_cqe--;
425 	}
426 	if (need_xdp_flush)
427 		xdp_do_flush();
428 
429 	/* Free CQEs to HW */
430 	otx2_write64(pfvf, NIX_LF_CQ_OP_DOOR,
431 		     ((u64)cq->cq_idx << 32) | processed_cqe);
432 
433 	return processed_cqe;
434 }
435 
otx2_refill_pool_ptrs(void * dev,struct otx2_cq_queue * cq)436 int otx2_refill_pool_ptrs(void *dev, struct otx2_cq_queue *cq)
437 {
438 	struct otx2_nic *pfvf = dev;
439 	int cnt = cq->pool_ptrs;
440 	dma_addr_t bufptr;
441 
442 	while (cq->pool_ptrs) {
443 		if (otx2_alloc_buffer(pfvf, cq, &bufptr))
444 			break;
445 		otx2_aura_freeptr(pfvf, cq->cq_idx, bufptr + OTX2_HEAD_ROOM);
446 		cq->pool_ptrs--;
447 	}
448 
449 	return cnt - cq->pool_ptrs;
450 }
451 
otx2_zc_submit_pkts(struct otx2_nic * pfvf,struct xsk_buff_pool * xsk_pool,int * xsk_frames,int qidx,int budget)452 static void otx2_zc_submit_pkts(struct otx2_nic *pfvf, struct xsk_buff_pool *xsk_pool,
453 				int *xsk_frames, int qidx, int budget)
454 {
455 	if (*xsk_frames)
456 		xsk_tx_completed(xsk_pool, *xsk_frames);
457 
458 	if (xsk_uses_need_wakeup(xsk_pool))
459 		xsk_set_tx_need_wakeup(xsk_pool);
460 
461 	otx2_zc_napi_handler(pfvf, xsk_pool, qidx, budget);
462 }
463 
otx2_tx_napi_handler(struct otx2_nic * pfvf,struct otx2_cq_queue * cq,int budget)464 static int otx2_tx_napi_handler(struct otx2_nic *pfvf,
465 				struct otx2_cq_queue *cq, int budget)
466 {
467 	int tx_pkts = 0, tx_bytes = 0, qidx;
468 	struct otx2_snd_queue *sq;
469 	struct nix_cqe_tx_s *cqe;
470 	struct net_device *ndev;
471 	int processed_cqe = 0;
472 	int xsk_frames = 0;
473 
474 	qidx = cq->cq_idx - pfvf->hw.rx_queues;
475 	sq = &pfvf->qset.sq[qidx];
476 
477 	if (cq->pend_cqe >= budget)
478 		goto process_cqe;
479 
480 	if (otx2_nix_cq_op_status(pfvf, cq) || !cq->pend_cqe) {
481 		if (sq->xsk_pool)
482 			otx2_zc_submit_pkts(pfvf, sq->xsk_pool, &xsk_frames,
483 					    qidx, budget);
484 		return 0;
485 	}
486 
487 process_cqe:
488 
489 	while (likely(processed_cqe < budget) && cq->pend_cqe) {
490 		cqe = (struct nix_cqe_tx_s *)otx2_get_next_cqe(cq);
491 		if (unlikely(!cqe)) {
492 			if (!processed_cqe)
493 				return 0;
494 			break;
495 		}
496 
497 		if (cq->cq_type == CQ_XDP)
498 			otx2_xdp_snd_pkt_handler(pfvf, sq, cqe, &xsk_frames);
499 		else
500 			otx2_snd_pkt_handler(pfvf, cq, &pfvf->qset.sq[qidx],
501 					     cqe, budget, &tx_pkts, &tx_bytes);
502 
503 		cqe->hdr.cqe_type = NIX_XQE_TYPE_INVALID;
504 		processed_cqe++;
505 		cq->pend_cqe--;
506 
507 		sq->cons_head++;
508 		sq->cons_head &= (sq->sqe_cnt - 1);
509 	}
510 
511 	/* Free CQEs to HW */
512 	otx2_write64(pfvf, NIX_LF_CQ_OP_DOOR,
513 		     ((u64)cq->cq_idx << 32) | processed_cqe);
514 
515 #if IS_ENABLED(CONFIG_RVU_ESWITCH)
516 	if (pfvf->flags & OTX2_FLAG_REP_MODE_ENABLED)
517 		ndev = pfvf->reps[qidx]->netdev;
518 	else
519 #endif
520 		ndev = pfvf->netdev;
521 
522 	if (likely(tx_pkts)) {
523 		struct netdev_queue *txq;
524 
525 		qidx = cq->cq_idx - pfvf->hw.rx_queues;
526 
527 		if (qidx >= pfvf->hw.tx_queues)
528 			qidx -= pfvf->hw.xdp_queues;
529 		if (pfvf->flags & OTX2_FLAG_REP_MODE_ENABLED)
530 			qidx = 0;
531 		txq = netdev_get_tx_queue(ndev, qidx);
532 		netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
533 		/* Check if queue was stopped earlier due to ring full */
534 		smp_mb();
535 		if (netif_tx_queue_stopped(txq) &&
536 		    netif_carrier_ok(ndev))
537 			netif_tx_wake_queue(txq);
538 	}
539 
540 	if (sq->xsk_pool)
541 		otx2_zc_submit_pkts(pfvf, sq->xsk_pool, &xsk_frames, qidx, budget);
542 
543 	return 0;
544 }
545 
otx2_adjust_adaptive_coalese(struct otx2_nic * pfvf,struct otx2_cq_poll * cq_poll)546 static void otx2_adjust_adaptive_coalese(struct otx2_nic *pfvf, struct otx2_cq_poll *cq_poll)
547 {
548 	struct dim_sample dim_sample = { 0 };
549 	u64 rx_frames, rx_bytes;
550 	u64 tx_frames, tx_bytes;
551 
552 	rx_frames = OTX2_GET_RX_STATS(RX_BCAST) + OTX2_GET_RX_STATS(RX_MCAST) +
553 		OTX2_GET_RX_STATS(RX_UCAST);
554 	rx_bytes = OTX2_GET_RX_STATS(RX_OCTS);
555 	tx_bytes = OTX2_GET_TX_STATS(TX_OCTS);
556 	tx_frames = OTX2_GET_TX_STATS(TX_UCAST);
557 
558 	dim_update_sample(pfvf->napi_events,
559 			  rx_frames + tx_frames,
560 			  rx_bytes + tx_bytes,
561 			  &dim_sample);
562 	net_dim(&cq_poll->dim, &dim_sample);
563 }
564 
otx2_napi_handler(struct napi_struct * napi,int budget)565 int otx2_napi_handler(struct napi_struct *napi, int budget)
566 {
567 	struct otx2_cq_queue *rx_cq = NULL;
568 	struct otx2_cq_queue *cq = NULL;
569 	struct otx2_pool *pool = NULL;
570 	struct otx2_cq_poll *cq_poll;
571 	int workdone = 0, cq_idx, i;
572 	struct otx2_qset *qset;
573 	struct otx2_nic *pfvf;
574 	int filled_cnt = -1;
575 
576 	cq_poll = container_of(napi, struct otx2_cq_poll, napi);
577 	pfvf = (struct otx2_nic *)cq_poll->dev;
578 	qset = &pfvf->qset;
579 
580 	for (i = 0; i < CQS_PER_CINT; i++) {
581 		cq_idx = cq_poll->cq_ids[i];
582 		if (unlikely(cq_idx == CINT_INVALID_CQ))
583 			continue;
584 		cq = &qset->cq[cq_idx];
585 		if (cq->cq_type == CQ_RX) {
586 			rx_cq = cq;
587 			workdone += otx2_rx_napi_handler(pfvf, napi,
588 							 cq, budget);
589 		} else {
590 			workdone += otx2_tx_napi_handler(pfvf, cq, budget);
591 		}
592 	}
593 
594 	if (rx_cq && rx_cq->pool_ptrs)
595 		filled_cnt = pfvf->hw_ops->refill_pool_ptrs(pfvf, rx_cq);
596 
597 	/* Clear the IRQ */
598 	otx2_write64(pfvf, NIX_LF_CINTX_INT(cq_poll->cint_idx), BIT_ULL(0));
599 
600 	if (workdone < budget && napi_complete_done(napi, workdone)) {
601 		/* If interface is going down, don't re-enable IRQ */
602 		if (pfvf->flags & OTX2_FLAG_INTF_DOWN)
603 			return workdone;
604 
605 		/* Adjust irq coalese using net_dim */
606 		if (pfvf->flags & OTX2_FLAG_ADPTV_INT_COAL_ENABLED)
607 			otx2_adjust_adaptive_coalese(pfvf, cq_poll);
608 
609 		if (likely(cq))
610 			pool = &pfvf->qset.pool[cq->cq_idx];
611 
612 		if (unlikely(!filled_cnt)) {
613 			struct refill_work *work;
614 			struct delayed_work *dwork;
615 
616 			if (likely(cq)) {
617 				work = &pfvf->refill_wrk[cq->cq_idx];
618 				dwork = &work->pool_refill_work;
619 				/* Schedule a task if no other task is running */
620 				if (!cq->refill_task_sched) {
621 					work->napi = napi;
622 					cq->refill_task_sched = true;
623 					schedule_delayed_work(dwork,
624 							      msecs_to_jiffies(100));
625 				}
626 				/* Call wake-up for not able to fill buffers */
627 				if (pool->xsk_pool)
628 					xsk_set_rx_need_wakeup(pool->xsk_pool);
629 			}
630 		} else {
631 			/* Clear wake-up, since buffers are filled successfully */
632 			if (pool && pool->xsk_pool)
633 				xsk_clear_rx_need_wakeup(pool->xsk_pool);
634 			/* Re-enable interrupts */
635 			otx2_write64(pfvf,
636 				     NIX_LF_CINTX_ENA_W1S(cq_poll->cint_idx),
637 				     BIT_ULL(0));
638 		}
639 	}
640 	return workdone;
641 }
642 EXPORT_SYMBOL(otx2_napi_handler);
643 
otx2_sqe_flush(void * dev,struct otx2_snd_queue * sq,int size,int qidx)644 void otx2_sqe_flush(void *dev, struct otx2_snd_queue *sq,
645 		    int size, int qidx)
646 {
647 	u64 status;
648 
649 	/* Packet data stores should finish before SQE is flushed to HW */
650 	dma_wmb();
651 
652 	do {
653 		memcpy(sq->lmt_addr, sq->sqe_base, size);
654 		status = otx2_lmt_flush(sq->io_addr);
655 	} while (status == 0);
656 
657 	sq->head++;
658 	sq->head &= (sq->sqe_cnt - 1);
659 }
660 
661 /* Add SQE scatter/gather subdescriptor structure */
otx2_sqe_add_sg(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct sk_buff * skb,int num_segs,int * offset)662 static bool otx2_sqe_add_sg(struct otx2_nic *pfvf, struct otx2_snd_queue *sq,
663 			    struct sk_buff *skb, int num_segs, int *offset)
664 {
665 	struct nix_sqe_sg_s *sg = NULL;
666 	u64 dma_addr, *iova = NULL;
667 	u16 *sg_lens = NULL;
668 	int seg, len;
669 
670 	sq->sg[sq->head].num_segs = 0;
671 
672 	for (seg = 0; seg < num_segs; seg++) {
673 		if ((seg % MAX_SEGS_PER_SG) == 0) {
674 			sg = (struct nix_sqe_sg_s *)(sq->sqe_base + *offset);
675 			sg->ld_type = NIX_SEND_LDTYPE_LDD;
676 			sg->subdc = NIX_SUBDC_SG;
677 			sg->segs = 0;
678 			sg_lens = (void *)sg;
679 			iova = (void *)sg + sizeof(*sg);
680 			/* Next subdc always starts at a 16byte boundary.
681 			 * So if sg->segs is whether 2 or 3, offset += 16bytes.
682 			 */
683 			if ((num_segs - seg) >= (MAX_SEGS_PER_SG - 1))
684 				*offset += sizeof(*sg) + (3 * sizeof(u64));
685 			else
686 				*offset += sizeof(*sg) + sizeof(u64);
687 		}
688 		dma_addr = otx2_dma_map_skb_frag(pfvf, skb, seg, &len);
689 		if (dma_mapping_error(pfvf->dev, dma_addr))
690 			return false;
691 
692 		sg_lens[frag_num(seg % MAX_SEGS_PER_SG)] = len;
693 		sg->segs++;
694 		*iova++ = dma_addr;
695 
696 		/* Save DMA mapping info for later unmapping */
697 		sq->sg[sq->head].dma_addr[seg] = dma_addr;
698 		sq->sg[sq->head].size[seg] = len;
699 		sq->sg[sq->head].num_segs++;
700 	}
701 
702 	sq->sg[sq->head].skb = (u64)skb;
703 	return true;
704 }
705 
706 /* Add SQE extended header subdescriptor */
otx2_sqe_add_ext(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct sk_buff * skb,int * offset)707 static void otx2_sqe_add_ext(struct otx2_nic *pfvf, struct otx2_snd_queue *sq,
708 			     struct sk_buff *skb, int *offset)
709 {
710 	struct nix_sqe_ext_s *ext;
711 
712 	ext = (struct nix_sqe_ext_s *)(sq->sqe_base + *offset);
713 	ext->subdc = NIX_SUBDC_EXT;
714 	if (skb_shinfo(skb)->gso_size) {
715 		ext->lso = 1;
716 		ext->lso_sb = skb_tcp_all_headers(skb);
717 		ext->lso_mps = skb_shinfo(skb)->gso_size;
718 
719 		/* Only TSOv4 and TSOv6 GSO offloads are supported */
720 		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
721 			ext->lso_format = pfvf->hw.lso_tsov4_idx;
722 
723 			/* HW adds payload size to 'ip_hdr->tot_len' while
724 			 * sending TSO segment, hence set payload length
725 			 * in IP header of the packet to just header length.
726 			 */
727 			ip_hdr(skb)->tot_len =
728 				htons(ext->lso_sb - skb_network_offset(skb));
729 		} else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
730 			ext->lso_format = pfvf->hw.lso_tsov6_idx;
731 			ipv6_hdr(skb)->payload_len = htons(tcp_hdrlen(skb));
732 		} else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
733 			__be16 l3_proto = vlan_get_protocol(skb);
734 			struct udphdr *udph = udp_hdr(skb);
735 			__be16 iplen;
736 
737 			ext->lso_sb = skb_transport_offset(skb) +
738 					sizeof(struct udphdr);
739 
740 			/* HW adds payload size to length fields in IP and
741 			 * UDP headers while segmentation, hence adjust the
742 			 * lengths to just header sizes.
743 			 */
744 			iplen = htons(ext->lso_sb - skb_network_offset(skb));
745 			if (l3_proto == htons(ETH_P_IP)) {
746 				ip_hdr(skb)->tot_len = iplen;
747 				ext->lso_format = pfvf->hw.lso_udpv4_idx;
748 			} else {
749 				ipv6_hdr(skb)->payload_len = iplen;
750 				ext->lso_format = pfvf->hw.lso_udpv6_idx;
751 			}
752 
753 			udph->len = htons(sizeof(struct udphdr));
754 		}
755 	} else if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
756 		ext->tstmp = 1;
757 	}
758 
759 #define OTX2_VLAN_PTR_OFFSET     (ETH_HLEN - ETH_TLEN)
760 	if (skb_vlan_tag_present(skb)) {
761 		if (skb->vlan_proto == htons(ETH_P_8021Q)) {
762 			ext->vlan1_ins_ena = 1;
763 			ext->vlan1_ins_ptr = OTX2_VLAN_PTR_OFFSET;
764 			ext->vlan1_ins_tci = skb_vlan_tag_get(skb);
765 		} else if (skb->vlan_proto == htons(ETH_P_8021AD)) {
766 			ext->vlan0_ins_ena = 1;
767 			ext->vlan0_ins_ptr = OTX2_VLAN_PTR_OFFSET;
768 			ext->vlan0_ins_tci = skb_vlan_tag_get(skb);
769 		}
770 	}
771 
772 	*offset += sizeof(*ext);
773 }
774 
otx2_sqe_add_mem(struct otx2_snd_queue * sq,int * offset,int alg,u64 iova,int ptp_offset,u64 base_ns,bool udp_csum_crt)775 static void otx2_sqe_add_mem(struct otx2_snd_queue *sq, int *offset,
776 			     int alg, u64 iova, int ptp_offset,
777 			     u64 base_ns, bool udp_csum_crt)
778 {
779 	struct nix_sqe_mem_s *mem;
780 
781 	mem = (struct nix_sqe_mem_s *)(sq->sqe_base + *offset);
782 	mem->subdc = NIX_SUBDC_MEM;
783 	mem->alg = alg;
784 	mem->wmem = 1; /* wait for the memory operation */
785 	mem->addr = iova;
786 
787 	if (ptp_offset) {
788 		mem->start_offset = ptp_offset;
789 		mem->udp_csum_crt = !!udp_csum_crt;
790 		mem->base_ns = base_ns;
791 		mem->step_type = 1;
792 	}
793 
794 	*offset += sizeof(*mem);
795 }
796 
797 /* Add SQE header subdescriptor structure */
otx2_sqe_add_hdr(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct nix_sqe_hdr_s * sqe_hdr,struct sk_buff * skb,u16 qidx)798 static void otx2_sqe_add_hdr(struct otx2_nic *pfvf, struct otx2_snd_queue *sq,
799 			     struct nix_sqe_hdr_s *sqe_hdr,
800 			     struct sk_buff *skb, u16 qidx)
801 {
802 	int proto = 0;
803 
804 	/* Check if SQE was framed before, if yes then no need to
805 	 * set these constants again and again.
806 	 */
807 	if (!sqe_hdr->total) {
808 		/* Don't free Tx buffers to Aura */
809 		sqe_hdr->df = 1;
810 		sqe_hdr->aura = sq->aura_id;
811 		/* Post a CQE Tx after pkt transmission */
812 		sqe_hdr->pnc = 1;
813 		sqe_hdr->sq = (qidx >=  pfvf->hw.tx_queues) ?
814 			       qidx + pfvf->hw.xdp_queues : qidx;
815 	}
816 	sqe_hdr->total = skb->len;
817 	/* Set SQE identifier which will be used later for freeing SKB */
818 	sqe_hdr->sqe_id = sq->head;
819 
820 	/* Offload TCP/UDP checksum to HW */
821 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
822 		sqe_hdr->ol3ptr = skb_network_offset(skb);
823 		sqe_hdr->ol4ptr = skb_transport_offset(skb);
824 		/* get vlan protocol Ethertype */
825 		if (eth_type_vlan(skb->protocol))
826 			skb->protocol = vlan_get_protocol(skb);
827 
828 		if (skb->protocol == htons(ETH_P_IP)) {
829 			proto = ip_hdr(skb)->protocol;
830 			/* In case of TSO, HW needs this to be explicitly set.
831 			 * So set this always, instead of adding a check.
832 			 */
833 			sqe_hdr->ol3type = NIX_SENDL3TYPE_IP4_CKSUM;
834 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
835 			proto = ipv6_hdr(skb)->nexthdr;
836 			sqe_hdr->ol3type = NIX_SENDL3TYPE_IP6;
837 		}
838 
839 		if (proto == IPPROTO_TCP)
840 			sqe_hdr->ol4type = NIX_SENDL4TYPE_TCP_CKSUM;
841 		else if (proto == IPPROTO_UDP)
842 			sqe_hdr->ol4type = NIX_SENDL4TYPE_UDP_CKSUM;
843 	}
844 }
845 
otx2_dma_map_tso_skb(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct sk_buff * skb,int sqe,int hdr_len)846 static int otx2_dma_map_tso_skb(struct otx2_nic *pfvf,
847 				struct otx2_snd_queue *sq,
848 				struct sk_buff *skb, int sqe, int hdr_len)
849 {
850 	int num_segs = skb_shinfo(skb)->nr_frags + 1;
851 	struct sg_list *sg = &sq->sg[sqe];
852 	u64 dma_addr;
853 	int seg, len;
854 
855 	sg->num_segs = 0;
856 
857 	/* Get payload length at skb->data */
858 	len = skb_headlen(skb) - hdr_len;
859 
860 	for (seg = 0; seg < num_segs; seg++) {
861 		/* Skip skb->data, if there is no payload */
862 		if (!seg && !len)
863 			continue;
864 		dma_addr = otx2_dma_map_skb_frag(pfvf, skb, seg, &len);
865 		if (dma_mapping_error(pfvf->dev, dma_addr))
866 			goto unmap;
867 
868 		/* Save DMA mapping info for later unmapping */
869 		sg->dma_addr[sg->num_segs] = dma_addr;
870 		sg->size[sg->num_segs] = len;
871 		sg->num_segs++;
872 	}
873 	return 0;
874 unmap:
875 	otx2_dma_unmap_skb_frags(pfvf, sg);
876 	return -EINVAL;
877 }
878 
otx2_tso_frag_dma_addr(struct otx2_snd_queue * sq,struct sk_buff * skb,int seg,u64 seg_addr,int hdr_len,int sqe)879 static u64 otx2_tso_frag_dma_addr(struct otx2_snd_queue *sq,
880 				  struct sk_buff *skb, int seg,
881 				  u64 seg_addr, int hdr_len, int sqe)
882 {
883 	struct sg_list *sg = &sq->sg[sqe];
884 	const skb_frag_t *frag;
885 	int offset;
886 
887 	if (seg < 0)
888 		return sg->dma_addr[0] + (seg_addr - (u64)skb->data);
889 
890 	frag = &skb_shinfo(skb)->frags[seg];
891 	offset = seg_addr - (u64)skb_frag_address(frag);
892 	if (skb_headlen(skb) - hdr_len)
893 		seg++;
894 	return sg->dma_addr[seg] + offset;
895 }
896 
otx2_sqe_tso_add_sg(struct otx2_snd_queue * sq,struct sg_list * list,int * offset)897 static void otx2_sqe_tso_add_sg(struct otx2_snd_queue *sq,
898 				struct sg_list *list, int *offset)
899 {
900 	struct nix_sqe_sg_s *sg = NULL;
901 	u16 *sg_lens = NULL;
902 	u64 *iova = NULL;
903 	int seg;
904 
905 	/* Add SG descriptors with buffer addresses */
906 	for (seg = 0; seg < list->num_segs; seg++) {
907 		if ((seg % MAX_SEGS_PER_SG) == 0) {
908 			sg = (struct nix_sqe_sg_s *)(sq->sqe_base + *offset);
909 			sg->ld_type = NIX_SEND_LDTYPE_LDD;
910 			sg->subdc = NIX_SUBDC_SG;
911 			sg->segs = 0;
912 			sg_lens = (void *)sg;
913 			iova = (void *)sg + sizeof(*sg);
914 			/* Next subdc always starts at a 16byte boundary.
915 			 * So if sg->segs is whether 2 or 3, offset += 16bytes.
916 			 */
917 			if ((list->num_segs - seg) >= (MAX_SEGS_PER_SG - 1))
918 				*offset += sizeof(*sg) + (3 * sizeof(u64));
919 			else
920 				*offset += sizeof(*sg) + sizeof(u64);
921 		}
922 		sg_lens[frag_num(seg % MAX_SEGS_PER_SG)] = list->size[seg];
923 		*iova++ = list->dma_addr[seg];
924 		sg->segs++;
925 	}
926 }
927 
otx2_sq_append_tso(struct otx2_nic * pfvf,struct otx2_snd_queue * sq,struct sk_buff * skb,u16 qidx)928 static void otx2_sq_append_tso(struct otx2_nic *pfvf, struct otx2_snd_queue *sq,
929 			       struct sk_buff *skb, u16 qidx)
930 {
931 	struct netdev_queue *txq = netdev_get_tx_queue(pfvf->netdev, qidx);
932 	int hdr_len, tcp_data, seg_len, pkt_len, offset;
933 	struct nix_sqe_hdr_s *sqe_hdr;
934 	int first_sqe = sq->head;
935 	struct sg_list list;
936 	struct tso_t tso;
937 
938 	hdr_len = tso_start(skb, &tso);
939 
940 	/* Map SKB's fragments to DMA.
941 	 * It's done here to avoid mapping for every TSO segment's packet.
942 	 */
943 	if (otx2_dma_map_tso_skb(pfvf, sq, skb, first_sqe, hdr_len)) {
944 		dev_kfree_skb_any(skb);
945 		return;
946 	}
947 
948 	netdev_tx_sent_queue(txq, skb->len);
949 
950 	tcp_data = skb->len - hdr_len;
951 	while (tcp_data > 0) {
952 		char *hdr;
953 
954 		seg_len = min_t(int, skb_shinfo(skb)->gso_size, tcp_data);
955 		tcp_data -= seg_len;
956 
957 		/* Set SQE's SEND_HDR */
958 		memset(sq->sqe_base, 0, sq->sqe_size);
959 		sqe_hdr = (struct nix_sqe_hdr_s *)(sq->sqe_base);
960 		otx2_sqe_add_hdr(pfvf, sq, sqe_hdr, skb, qidx);
961 		offset = sizeof(*sqe_hdr);
962 
963 		/* Add TSO segment's pkt header */
964 		hdr = sq->tso_hdrs->base + (sq->head * TSO_HEADER_SIZE);
965 		tso_build_hdr(skb, hdr, &tso, seg_len, tcp_data == 0);
966 		list.dma_addr[0] =
967 			sq->tso_hdrs->iova + (sq->head * TSO_HEADER_SIZE);
968 		list.size[0] = hdr_len;
969 		list.num_segs = 1;
970 
971 		/* Add TSO segment's payload data fragments */
972 		pkt_len = hdr_len;
973 		while (seg_len > 0) {
974 			int size;
975 
976 			size = min_t(int, tso.size, seg_len);
977 
978 			list.size[list.num_segs] = size;
979 			list.dma_addr[list.num_segs] =
980 				otx2_tso_frag_dma_addr(sq, skb,
981 						       tso.next_frag_idx - 1,
982 						       (u64)tso.data, hdr_len,
983 						       first_sqe);
984 			list.num_segs++;
985 			pkt_len += size;
986 			seg_len -= size;
987 			tso_build_data(skb, &tso, size);
988 		}
989 		sqe_hdr->total = pkt_len;
990 		otx2_sqe_tso_add_sg(sq, &list, &offset);
991 
992 		/* DMA mappings and skb needs to be freed only after last
993 		 * TSO segment is transmitted out. So set 'PNC' only for
994 		 * last segment. Also point last segment's sqe_id to first
995 		 * segment's SQE index where skb address and DMA mappings
996 		 * are saved.
997 		 */
998 		if (!tcp_data) {
999 			sqe_hdr->pnc = 1;
1000 			sqe_hdr->sqe_id = first_sqe;
1001 			sq->sg[first_sqe].skb = (u64)skb;
1002 		} else {
1003 			sqe_hdr->pnc = 0;
1004 		}
1005 
1006 		sqe_hdr->sizem1 = (offset / 16) - 1;
1007 
1008 		/* Flush SQE to HW */
1009 		pfvf->hw_ops->sqe_flush(pfvf, sq, offset, qidx);
1010 	}
1011 }
1012 
is_hw_tso_supported(struct otx2_nic * pfvf,struct sk_buff * skb)1013 static bool is_hw_tso_supported(struct otx2_nic *pfvf,
1014 				struct sk_buff *skb)
1015 {
1016 	int payload_len, last_seg_size;
1017 
1018 	if (test_bit(HW_TSO, &pfvf->hw.cap_flag))
1019 		return true;
1020 
1021 	/* On 96xx A0, HW TSO not supported */
1022 	if (!is_96xx_B0(pfvf->pdev))
1023 		return false;
1024 
1025 	/* HW has an issue due to which when the payload of the last LSO
1026 	 * segment is shorter than 16 bytes, some header fields may not
1027 	 * be correctly modified, hence don't offload such TSO segments.
1028 	 */
1029 
1030 	payload_len = skb->len - skb_tcp_all_headers(skb);
1031 	last_seg_size = payload_len % skb_shinfo(skb)->gso_size;
1032 	if (last_seg_size && last_seg_size < 16)
1033 		return false;
1034 
1035 	return true;
1036 }
1037 
otx2_get_sqe_count(struct otx2_nic * pfvf,struct sk_buff * skb)1038 static int otx2_get_sqe_count(struct otx2_nic *pfvf, struct sk_buff *skb)
1039 {
1040 	if (!skb_shinfo(skb)->gso_size)
1041 		return 1;
1042 
1043 	/* HW TSO */
1044 	if (is_hw_tso_supported(pfvf, skb))
1045 		return 1;
1046 
1047 	/* SW TSO */
1048 	return skb_shinfo(skb)->gso_segs;
1049 }
1050 
otx2_validate_network_transport(struct sk_buff * skb)1051 static bool otx2_validate_network_transport(struct sk_buff *skb)
1052 {
1053 	if ((ip_hdr(skb)->protocol == IPPROTO_UDP) ||
1054 	    (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)) {
1055 		struct udphdr *udph = udp_hdr(skb);
1056 
1057 		if (udph->source == htons(PTP_PORT) &&
1058 		    udph->dest == htons(PTP_PORT))
1059 			return true;
1060 	}
1061 
1062 	return false;
1063 }
1064 
otx2_ptp_is_sync(struct sk_buff * skb,int * offset,bool * udp_csum_crt)1065 static bool otx2_ptp_is_sync(struct sk_buff *skb, int *offset, bool *udp_csum_crt)
1066 {
1067 	struct ethhdr *eth = (struct ethhdr *)(skb->data);
1068 	u16 nix_offload_hlen = 0, inner_vhlen = 0;
1069 	bool udp_hdr_present = false, is_sync;
1070 	u8 *data = skb->data, *msgtype;
1071 	__be16 proto = eth->h_proto;
1072 	int network_depth = 0;
1073 
1074 	/* NIX is programmed to offload outer  VLAN header
1075 	 * in case of single vlan protocol field holds Network header ETH_IP/V6
1076 	 * in case of stacked vlan protocol field holds Inner vlan (8100)
1077 	 */
1078 	if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX &&
1079 	    skb->dev->features & NETIF_F_HW_VLAN_STAG_TX) {
1080 		if (skb->vlan_proto == htons(ETH_P_8021AD)) {
1081 			/* Get vlan protocol */
1082 			proto = __vlan_get_protocol(skb, eth->h_proto, NULL);
1083 			/* SKB APIs like skb_transport_offset does not include
1084 			 * offloaded vlan header length. Need to explicitly add
1085 			 * the length
1086 			 */
1087 			nix_offload_hlen = VLAN_HLEN;
1088 			inner_vhlen = VLAN_HLEN;
1089 		} else if (skb->vlan_proto == htons(ETH_P_8021Q)) {
1090 			nix_offload_hlen = VLAN_HLEN;
1091 		}
1092 	} else if (eth_type_vlan(eth->h_proto)) {
1093 		proto = __vlan_get_protocol(skb, eth->h_proto, &network_depth);
1094 	}
1095 
1096 	switch (ntohs(proto)) {
1097 	case ETH_P_1588:
1098 		if (network_depth)
1099 			*offset = network_depth;
1100 		else
1101 			*offset = ETH_HLEN + nix_offload_hlen +
1102 				  inner_vhlen;
1103 		break;
1104 	case ETH_P_IP:
1105 	case ETH_P_IPV6:
1106 		if (!otx2_validate_network_transport(skb))
1107 			return false;
1108 
1109 		*offset = nix_offload_hlen + skb_transport_offset(skb) +
1110 			  sizeof(struct udphdr);
1111 		udp_hdr_present = true;
1112 
1113 	}
1114 
1115 	msgtype = data + *offset;
1116 	/* Check PTP messageId is SYNC or not */
1117 	is_sync = !(*msgtype & 0xf);
1118 	if (is_sync)
1119 		*udp_csum_crt = udp_hdr_present;
1120 	else
1121 		*offset = 0;
1122 
1123 	return is_sync;
1124 }
1125 
otx2_set_txtstamp(struct otx2_nic * pfvf,struct sk_buff * skb,struct otx2_snd_queue * sq,int * offset)1126 static void otx2_set_txtstamp(struct otx2_nic *pfvf, struct sk_buff *skb,
1127 			      struct otx2_snd_queue *sq, int *offset)
1128 {
1129 	struct ethhdr	*eth = (struct ethhdr *)(skb->data);
1130 	struct ptpv2_tstamp *origin_tstamp;
1131 	bool udp_csum_crt = false;
1132 	unsigned int udphoff;
1133 	struct timespec64 ts;
1134 	int ptp_offset = 0;
1135 	__wsum skb_csum;
1136 	u64 iova;
1137 
1138 	if (unlikely(!skb_shinfo(skb)->gso_size &&
1139 		     (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))) {
1140 		if (unlikely(pfvf->flags & OTX2_FLAG_PTP_ONESTEP_SYNC &&
1141 			     otx2_ptp_is_sync(skb, &ptp_offset, &udp_csum_crt))) {
1142 			origin_tstamp = (struct ptpv2_tstamp *)
1143 					((u8 *)skb->data + ptp_offset +
1144 					 PTP_SYNC_SEC_OFFSET);
1145 			ts = ns_to_timespec64(pfvf->ptp->tstamp);
1146 			origin_tstamp->seconds_msb = htons((ts.tv_sec >> 32) & 0xffff);
1147 			origin_tstamp->seconds_lsb = htonl(ts.tv_sec & 0xffffffff);
1148 			origin_tstamp->nanoseconds = htonl(ts.tv_nsec);
1149 			/* Point to correction field in PTP packet */
1150 			ptp_offset += 8;
1151 
1152 			/* When user disables hw checksum, stack calculates the csum,
1153 			 * but it does not cover ptp timestamp which is added later.
1154 			 * Recalculate the checksum manually considering the timestamp.
1155 			 */
1156 			if (udp_csum_crt) {
1157 				struct udphdr *uh = udp_hdr(skb);
1158 
1159 				if (skb->ip_summed != CHECKSUM_PARTIAL && uh->check != 0) {
1160 					udphoff = skb_transport_offset(skb);
1161 					uh->check = 0;
1162 					skb_csum = skb_checksum(skb, udphoff, skb->len - udphoff,
1163 								0);
1164 					if (ntohs(eth->h_proto) == ETH_P_IPV6)
1165 						uh->check = csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
1166 									    &ipv6_hdr(skb)->daddr,
1167 									    skb->len - udphoff,
1168 									    ipv6_hdr(skb)->nexthdr,
1169 									    skb_csum);
1170 					else
1171 						uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
1172 									      ip_hdr(skb)->daddr,
1173 									      skb->len - udphoff,
1174 									      IPPROTO_UDP,
1175 									      skb_csum);
1176 				}
1177 			}
1178 		} else {
1179 			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
1180 		}
1181 		iova = sq->timestamps->iova + (sq->head * sizeof(u64));
1182 		otx2_sqe_add_mem(sq, offset, NIX_SENDMEMALG_E_SETTSTMP, iova,
1183 				 ptp_offset, pfvf->ptp->base_ns, udp_csum_crt);
1184 	} else {
1185 		skb_tx_timestamp(skb);
1186 	}
1187 }
1188 
otx2_sq_append_skb(void * dev,struct netdev_queue * txq,struct otx2_snd_queue * sq,struct sk_buff * skb,u16 qidx)1189 bool otx2_sq_append_skb(void *dev, struct netdev_queue *txq,
1190 			struct otx2_snd_queue *sq,
1191 			struct sk_buff *skb, u16 qidx)
1192 {
1193 	int offset, num_segs, free_desc;
1194 	struct nix_sqe_hdr_s *sqe_hdr;
1195 	struct otx2_nic *pfvf = dev;
1196 	bool ret;
1197 
1198 	/* Check if there is enough room between producer
1199 	 * and consumer index.
1200 	 */
1201 	free_desc = otx2_get_free_sqe(sq);
1202 	if (free_desc < sq->sqe_thresh)
1203 		return false;
1204 
1205 	if (free_desc < otx2_get_sqe_count(pfvf, skb))
1206 		return false;
1207 
1208 	num_segs = skb_shinfo(skb)->nr_frags + 1;
1209 
1210 	/* If SKB doesn't fit in a single SQE, linearize it.
1211 	 * TODO: Consider adding JUMP descriptor instead.
1212 	 */
1213 
1214 	if (unlikely(num_segs > OTX2_MAX_FRAGS_IN_SQE)) {
1215 		if (__skb_linearize(skb)) {
1216 			dev_kfree_skb_any(skb);
1217 			return true;
1218 		}
1219 		num_segs = skb_shinfo(skb)->nr_frags + 1;
1220 	}
1221 
1222 	if (skb_shinfo(skb)->gso_size && !is_hw_tso_supported(pfvf, skb)) {
1223 		/* Insert vlan tag before giving pkt to tso */
1224 		if (skb_vlan_tag_present(skb)) {
1225 			skb = __vlan_hwaccel_push_inside(skb);
1226 			if (!skb)
1227 				return true;
1228 		}
1229 		otx2_sq_append_tso(pfvf, sq, skb, qidx);
1230 		return true;
1231 	}
1232 
1233 	/* Set sqe base address */
1234 	otx2_sq_set_sqe_base(sq, skb);
1235 
1236 	/* Set SQE's SEND_HDR.
1237 	 * Do not clear the first 64bit as it contains constant info.
1238 	 */
1239 	memset(sq->sqe_base + 8, 0, sq->sqe_size - 8);
1240 	sqe_hdr = (struct nix_sqe_hdr_s *)(sq->sqe_base);
1241 	otx2_sqe_add_hdr(pfvf, sq, sqe_hdr, skb, qidx);
1242 	offset = sizeof(*sqe_hdr);
1243 
1244 	/* Add extended header if needed */
1245 	otx2_sqe_add_ext(pfvf, sq, skb, &offset);
1246 
1247 	/* Add SG subdesc with data frags */
1248 	if (static_branch_unlikely(&cn10k_ipsec_sa_enabled) &&
1249 	    (xfrm_offload(skb)))
1250 		ret = otx2_sqe_add_sg_ipsec(pfvf, sq, skb, num_segs, &offset);
1251 	else
1252 		ret = otx2_sqe_add_sg(pfvf, sq, skb, num_segs, &offset);
1253 
1254 	if (!ret) {
1255 		otx2_dma_unmap_skb_frags(pfvf, &sq->sg[sq->head]);
1256 		return false;
1257 	}
1258 
1259 	otx2_set_txtstamp(pfvf, skb, sq, &offset);
1260 
1261 	sqe_hdr->sizem1 = (offset / 16) - 1;
1262 
1263 	if (static_branch_unlikely(&cn10k_ipsec_sa_enabled) &&
1264 	    (xfrm_offload(skb)))
1265 		return cn10k_ipsec_transmit(pfvf, txq, sq, skb, num_segs,
1266 					    offset);
1267 
1268 	netdev_tx_sent_queue(txq, skb->len);
1269 
1270 	/* Flush SQE to HW */
1271 	pfvf->hw_ops->sqe_flush(pfvf, sq, offset, qidx);
1272 	return true;
1273 }
1274 EXPORT_SYMBOL(otx2_sq_append_skb);
1275 
otx2_cleanup_rx_cqes(struct otx2_nic * pfvf,struct otx2_cq_queue * cq,int qidx)1276 void otx2_cleanup_rx_cqes(struct otx2_nic *pfvf, struct otx2_cq_queue *cq, int qidx)
1277 {
1278 	struct nix_cqe_rx_s *cqe;
1279 	struct otx2_pool *pool;
1280 	int processed_cqe = 0;
1281 	u16 pool_id;
1282 	u64 iova;
1283 
1284 	pool_id = otx2_get_pool_idx(pfvf, AURA_NIX_RQ, qidx);
1285 	pool = &pfvf->qset.pool[pool_id];
1286 
1287 	if (pfvf->xdp_prog) {
1288 		if (pool->page_pool)
1289 			xdp_rxq_info_unreg_mem_model(&cq->xdp_rxq);
1290 
1291 		xdp_rxq_info_unreg(&cq->xdp_rxq);
1292 	}
1293 
1294 	if (otx2_nix_cq_op_status(pfvf, cq) || !cq->pend_cqe)
1295 		return;
1296 
1297 	while (cq->pend_cqe) {
1298 		cqe = (struct nix_cqe_rx_s *)otx2_get_next_cqe(cq);
1299 		processed_cqe++;
1300 		cq->pend_cqe--;
1301 
1302 		if (!cqe)
1303 			continue;
1304 		if (cqe->sg.segs > 1) {
1305 			otx2_free_rcv_seg(pfvf, cqe, cq->cq_idx);
1306 			continue;
1307 		}
1308 		iova = cqe->sg.seg_addr - OTX2_HEAD_ROOM;
1309 
1310 		otx2_free_bufs(pfvf, pool, iova, pfvf->rbsize);
1311 	}
1312 
1313 	/* Free CQEs to HW */
1314 	otx2_write64(pfvf, NIX_LF_CQ_OP_DOOR,
1315 		     ((u64)cq->cq_idx << 32) | processed_cqe);
1316 }
1317 
otx2_cleanup_tx_cqes(struct otx2_nic * pfvf,struct otx2_cq_queue * cq)1318 void otx2_cleanup_tx_cqes(struct otx2_nic *pfvf, struct otx2_cq_queue *cq)
1319 {
1320 	int tx_pkts = 0, tx_bytes = 0;
1321 	struct sk_buff *skb = NULL;
1322 	struct otx2_snd_queue *sq;
1323 	struct nix_cqe_tx_s *cqe;
1324 	struct netdev_queue *txq;
1325 	int processed_cqe = 0;
1326 	struct sg_list *sg;
1327 	int qidx;
1328 
1329 	qidx = cq->cq_idx - pfvf->hw.rx_queues;
1330 	sq = &pfvf->qset.sq[qidx];
1331 
1332 	if (otx2_nix_cq_op_status(pfvf, cq) || !cq->pend_cqe)
1333 		return;
1334 
1335 	while (cq->pend_cqe) {
1336 		cqe = (struct nix_cqe_tx_s *)otx2_get_next_cqe(cq);
1337 		processed_cqe++;
1338 		cq->pend_cqe--;
1339 
1340 		if (!cqe)
1341 			continue;
1342 		sg = &sq->sg[cqe->comp.sqe_id];
1343 		skb = (struct sk_buff *)sg->skb;
1344 		if (skb) {
1345 			tx_bytes += skb->len;
1346 			tx_pkts++;
1347 			otx2_dma_unmap_skb_frags(pfvf, sg);
1348 			dev_kfree_skb_any(skb);
1349 			sg->skb = (u64)NULL;
1350 		}
1351 	}
1352 
1353 	if (likely(tx_pkts)) {
1354 		if (qidx >= pfvf->hw.tx_queues)
1355 			qidx -= pfvf->hw.xdp_queues;
1356 		txq = netdev_get_tx_queue(pfvf->netdev, qidx);
1357 		netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
1358 	}
1359 	/* Free CQEs to HW */
1360 	otx2_write64(pfvf, NIX_LF_CQ_OP_DOOR,
1361 		     ((u64)cq->cq_idx << 32) | processed_cqe);
1362 }
1363 
otx2_rxtx_enable(struct otx2_nic * pfvf,bool enable)1364 int otx2_rxtx_enable(struct otx2_nic *pfvf, bool enable)
1365 {
1366 	struct msg_req *msg;
1367 	int err;
1368 
1369 	mutex_lock(&pfvf->mbox.lock);
1370 	if (enable)
1371 		msg = otx2_mbox_alloc_msg_nix_lf_start_rx(&pfvf->mbox);
1372 	else
1373 		msg = otx2_mbox_alloc_msg_nix_lf_stop_rx(&pfvf->mbox);
1374 
1375 	if (!msg) {
1376 		mutex_unlock(&pfvf->mbox.lock);
1377 		return -ENOMEM;
1378 	}
1379 
1380 	err = otx2_sync_mbox_msg(&pfvf->mbox);
1381 	mutex_unlock(&pfvf->mbox.lock);
1382 	return err;
1383 }
1384 
otx2_free_pending_sqe(struct otx2_nic * pfvf)1385 void otx2_free_pending_sqe(struct otx2_nic *pfvf)
1386 {
1387 	int tx_pkts = 0, tx_bytes = 0;
1388 	struct sk_buff *skb = NULL;
1389 	struct otx2_snd_queue *sq;
1390 	struct netdev_queue *txq;
1391 	struct sg_list *sg;
1392 	int sq_idx, sqe;
1393 
1394 	for (sq_idx = 0; sq_idx < pfvf->hw.tx_queues; sq_idx++) {
1395 		sq = &pfvf->qset.sq[sq_idx];
1396 		for (sqe = 0; sqe < sq->sqe_cnt; sqe++) {
1397 			sg = &sq->sg[sqe];
1398 			skb = (struct sk_buff *)sg->skb;
1399 			if (skb) {
1400 				tx_bytes += skb->len;
1401 				tx_pkts++;
1402 				otx2_dma_unmap_skb_frags(pfvf, sg);
1403 				dev_kfree_skb_any(skb);
1404 				sg->skb = (u64)NULL;
1405 			}
1406 		}
1407 
1408 		if (!tx_pkts)
1409 			continue;
1410 		txq = netdev_get_tx_queue(pfvf->netdev, sq_idx);
1411 		netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
1412 		tx_pkts = 0;
1413 		tx_bytes = 0;
1414 	}
1415 }
1416 
otx2_xdp_sqe_add_sg(struct otx2_snd_queue * sq,struct xdp_frame * xdpf,u64 dma_addr,int len,int * offset,u16 flags)1417 void otx2_xdp_sqe_add_sg(struct otx2_snd_queue *sq, struct xdp_frame *xdpf,
1418 			 u64 dma_addr, int len, int *offset, u16 flags)
1419 {
1420 	struct nix_sqe_sg_s *sg = NULL;
1421 	u64 *iova = NULL;
1422 
1423 	sg = (struct nix_sqe_sg_s *)(sq->sqe_base + *offset);
1424 	sg->ld_type = NIX_SEND_LDTYPE_LDD;
1425 	sg->subdc = NIX_SUBDC_SG;
1426 	sg->segs = 1;
1427 	sg->seg1_size = len;
1428 	iova = (void *)sg + sizeof(*sg);
1429 	*iova = dma_addr;
1430 	*offset += sizeof(*sg) + sizeof(u64);
1431 
1432 	sq->sg[sq->head].dma_addr[0] = dma_addr;
1433 	sq->sg[sq->head].size[0] = len;
1434 	sq->sg[sq->head].num_segs = 1;
1435 	sq->sg[sq->head].flags = flags;
1436 	sq->sg[sq->head].skb = (u64)xdpf;
1437 }
1438 
otx2_read_free_sqe(struct otx2_nic * pfvf,u16 qidx)1439 int otx2_read_free_sqe(struct otx2_nic *pfvf, u16 qidx)
1440 {
1441 	struct otx2_snd_queue *sq;
1442 	int free_sqe;
1443 
1444 	sq = &pfvf->qset.sq[qidx];
1445 	free_sqe = otx2_get_free_sqe(sq);
1446 	if (free_sqe < sq->sqe_thresh) {
1447 		netdev_warn(pfvf->netdev, "No free sqe for Send queue%d\n", qidx);
1448 		return 0;
1449 	}
1450 
1451 	return free_sqe - sq->sqe_thresh;
1452 }
1453 
otx2_xdp_sq_append_pkt(struct otx2_nic * pfvf,struct xdp_frame * xdpf,u64 iova,int len,u16 qidx,u16 flags)1454 bool otx2_xdp_sq_append_pkt(struct otx2_nic *pfvf, struct xdp_frame *xdpf,
1455 			    u64 iova, int len, u16 qidx, u16 flags)
1456 {
1457 	struct nix_sqe_hdr_s *sqe_hdr;
1458 	struct otx2_snd_queue *sq;
1459 	int offset, free_sqe;
1460 
1461 	sq = &pfvf->qset.sq[qidx];
1462 	free_sqe = otx2_get_free_sqe(sq);
1463 	if (free_sqe < sq->sqe_thresh)
1464 		return false;
1465 
1466 	memset(sq->sqe_base + 8, 0, sq->sqe_size - 8);
1467 
1468 	sqe_hdr = (struct nix_sqe_hdr_s *)(sq->sqe_base);
1469 
1470 	if (!sqe_hdr->total) {
1471 		sqe_hdr->aura = sq->aura_id;
1472 		sqe_hdr->df = 1;
1473 		sqe_hdr->sq = qidx;
1474 		sqe_hdr->pnc = 1;
1475 	}
1476 	sqe_hdr->total = len;
1477 	sqe_hdr->sqe_id = sq->head;
1478 
1479 	offset = sizeof(*sqe_hdr);
1480 
1481 	otx2_xdp_sqe_add_sg(sq, xdpf, iova, len, &offset, flags);
1482 	sqe_hdr->sizem1 = (offset / 16) - 1;
1483 	pfvf->hw_ops->sqe_flush(pfvf, sq, offset, qidx);
1484 
1485 	return true;
1486 }
1487 
otx2_xdp_rcv_pkt_handler(struct otx2_nic * pfvf,struct bpf_prog * prog,struct nix_cqe_rx_s * cqe,struct otx2_cq_queue * cq,u32 * metasize,bool * need_xdp_flush)1488 static bool otx2_xdp_rcv_pkt_handler(struct otx2_nic *pfvf,
1489 				     struct bpf_prog *prog,
1490 				     struct nix_cqe_rx_s *cqe,
1491 				     struct otx2_cq_queue *cq,
1492 				     u32 *metasize, bool *need_xdp_flush)
1493 {
1494 	struct xdp_buff xdp, *xsk_buff = NULL;
1495 	unsigned char *hard_start;
1496 	struct otx2_pool *pool;
1497 	struct xdp_frame *xdpf;
1498 	int qidx = cq->cq_idx;
1499 	struct page *page;
1500 	u64 iova, pa;
1501 	u32 act;
1502 	int err;
1503 
1504 	pool = &pfvf->qset.pool[qidx];
1505 
1506 	if (pool->xsk_pool) {
1507 		xsk_buff = pool->xdp[--cq->rbpool->xdp_top];
1508 		if (!xsk_buff)
1509 			return false;
1510 
1511 		xsk_buff->data_end = xsk_buff->data + cqe->sg.seg_size;
1512 		act = bpf_prog_run_xdp(prog, xsk_buff);
1513 		goto handle_xdp_verdict;
1514 	}
1515 
1516 	iova = cqe->sg.seg_addr - OTX2_HEAD_ROOM;
1517 	pa = otx2_iova_to_phys(pfvf->iommu_domain, iova);
1518 	page = virt_to_page(phys_to_virt(pa));
1519 
1520 	xdp_init_buff(&xdp, pfvf->rbsize, &cq->xdp_rxq);
1521 
1522 	hard_start = (unsigned char *)phys_to_virt(pa);
1523 	xdp_prepare_buff(&xdp, hard_start, OTX2_HEAD_ROOM,
1524 			 cqe->sg.seg_size, true);
1525 
1526 	act = bpf_prog_run_xdp(prog, &xdp);
1527 
1528 handle_xdp_verdict:
1529 	switch (act) {
1530 	case XDP_PASS:
1531 		*metasize = xdp.data - xdp.data_meta;
1532 		break;
1533 	case XDP_TX:
1534 		qidx += pfvf->hw.tx_queues;
1535 		cq->pool_ptrs++;
1536 		xdpf = xdp_convert_buff_to_frame(&xdp);
1537 		return otx2_xdp_sq_append_pkt(pfvf, xdpf,
1538 					      cqe->sg.seg_addr,
1539 					      cqe->sg.seg_size,
1540 					      qidx, OTX2_XDP_TX);
1541 	case XDP_REDIRECT:
1542 		cq->pool_ptrs++;
1543 		if (xsk_buff) {
1544 			err = xdp_do_redirect(pfvf->netdev, xsk_buff, prog);
1545 			if (!err) {
1546 				*need_xdp_flush = true;
1547 				return true;
1548 			}
1549 			return false;
1550 		}
1551 
1552 		err = xdp_do_redirect(pfvf->netdev, &xdp, prog);
1553 		if (!err) {
1554 			*need_xdp_flush = true;
1555 			return true;
1556 		}
1557 
1558 		otx2_dma_unmap_page(pfvf, iova, pfvf->rbsize,
1559 				    DMA_FROM_DEVICE);
1560 		xdpf = xdp_convert_buff_to_frame(&xdp);
1561 		xdp_return_frame(xdpf);
1562 		break;
1563 	default:
1564 		bpf_warn_invalid_xdp_action(pfvf->netdev, prog, act);
1565 		fallthrough;
1566 	case XDP_ABORTED:
1567 		if (act == XDP_ABORTED)
1568 			trace_xdp_exception(pfvf->netdev, prog, act);
1569 		fallthrough;
1570 	case XDP_DROP:
1571 		cq->pool_ptrs++;
1572 		if (xsk_buff) {
1573 			xsk_buff_free(xsk_buff);
1574 		} else if (pp_page_to_nmdesc(page)->pp) {
1575 			page_pool_recycle_direct(pool->page_pool, page);
1576 		} else {
1577 			otx2_dma_unmap_page(pfvf, iova, pfvf->rbsize,
1578 					    DMA_FROM_DEVICE);
1579 			put_page(page);
1580 		}
1581 		return true;
1582 	}
1583 	return false;
1584 }
1585