1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2018 Intel Corporation. */
3 
4 #include <linux/bpf_trace.h>
5 #include <linux/stringify.h>
6 #include <net/xdp_sock_drv.h>
7 #include <net/xdp.h>
8 
9 #include "i40e.h"
10 #include "i40e_txrx_common.h"
11 #include "i40e_xsk.h"
12 
13 int i40e_alloc_rx_bi_zc(struct i40e_ring *rx_ring)
14 {
15 	unsigned long sz = sizeof(*rx_ring->rx_bi_zc) * rx_ring->count;
16 
17 	rx_ring->rx_bi_zc = kzalloc(sz, GFP_KERNEL);
18 	return rx_ring->rx_bi_zc ? 0 : -ENOMEM;
19 }
20 
21 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring)
22 {
23 	memset(rx_ring->rx_bi_zc, 0,
24 	       sizeof(*rx_ring->rx_bi_zc) * rx_ring->count);
25 }
26 
27 static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx)
28 {
29 	return &rx_ring->rx_bi_zc[idx];
30 }
31 
32 /**
33  * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a
34  * certain ring/qid
35  * @vsi: Current VSI
36  * @pool: buffer pool
37  * @qid: Rx ring to associate buffer pool with
38  *
39  * Returns 0 on success, <0 on failure
40  **/
41 static int i40e_xsk_pool_enable(struct i40e_vsi *vsi,
42 				struct xsk_buff_pool *pool,
43 				u16 qid)
44 {
45 	struct net_device *netdev = vsi->netdev;
46 	bool if_running;
47 	int err;
48 
49 	if (vsi->type != I40E_VSI_MAIN)
50 		return -EINVAL;
51 
52 	if (qid >= vsi->num_queue_pairs)
53 		return -EINVAL;
54 
55 	if (qid >= netdev->real_num_rx_queues ||
56 	    qid >= netdev->real_num_tx_queues)
57 		return -EINVAL;
58 
59 	err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR);
60 	if (err)
61 		return err;
62 
63 	set_bit(qid, vsi->af_xdp_zc_qps);
64 
65 	if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
66 
67 	if (if_running) {
68 		err = i40e_queue_pair_disable(vsi, qid);
69 		if (err)
70 			return err;
71 
72 		err = i40e_queue_pair_enable(vsi, qid);
73 		if (err)
74 			return err;
75 
76 		/* Kick start the NAPI context so that receiving will start */
77 		err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX);
78 		if (err)
79 			return err;
80 	}
81 
82 	return 0;
83 }
84 
85 /**
86  * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a
87  * certain ring/qid
88  * @vsi: Current VSI
89  * @qid: Rx ring to associate buffer pool with
90  *
91  * Returns 0 on success, <0 on failure
92  **/
93 static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid)
94 {
95 	struct net_device *netdev = vsi->netdev;
96 	struct xsk_buff_pool *pool;
97 	bool if_running;
98 	int err;
99 
100 	pool = xsk_get_pool_from_qid(netdev, qid);
101 	if (!pool)
102 		return -EINVAL;
103 
104 	if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
105 
106 	if (if_running) {
107 		err = i40e_queue_pair_disable(vsi, qid);
108 		if (err)
109 			return err;
110 	}
111 
112 	clear_bit(qid, vsi->af_xdp_zc_qps);
113 	xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR);
114 
115 	if (if_running) {
116 		err = i40e_queue_pair_enable(vsi, qid);
117 		if (err)
118 			return err;
119 	}
120 
121 	return 0;
122 }
123 
124 /**
125  * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from
126  * a ring/qid
127  * @vsi: Current VSI
128  * @pool: Buffer pool to enable/associate to a ring, or NULL to disable
129  * @qid: Rx ring to (dis)associate buffer pool (from)to
130  *
131  * This function enables or disables a buffer pool to a certain ring.
132  *
133  * Returns 0 on success, <0 on failure
134  **/
135 int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool,
136 			u16 qid)
137 {
138 	return pool ? i40e_xsk_pool_enable(vsi, pool, qid) :
139 		i40e_xsk_pool_disable(vsi, qid);
140 }
141 
142 /**
143  * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff
144  * @rx_ring: Rx ring
145  * @xdp: xdp_buff used as input to the XDP program
146  *
147  * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
148  **/
149 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
150 {
151 	int err, result = I40E_XDP_PASS;
152 	struct i40e_ring *xdp_ring;
153 	struct bpf_prog *xdp_prog;
154 	u32 act;
155 
156 	rcu_read_lock();
157 	/* NB! xdp_prog will always be !NULL, due to the fact that
158 	 * this path is enabled by setting an XDP program.
159 	 */
160 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
161 	act = bpf_prog_run_xdp(xdp_prog, xdp);
162 
163 	switch (act) {
164 	case XDP_PASS:
165 		break;
166 	case XDP_TX:
167 		xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
168 		result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
169 		break;
170 	case XDP_REDIRECT:
171 		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
172 		result = !err ? I40E_XDP_REDIR : I40E_XDP_CONSUMED;
173 		break;
174 	default:
175 		bpf_warn_invalid_xdp_action(act);
176 		fallthrough;
177 	case XDP_ABORTED:
178 		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
179 		fallthrough; /* handle aborts by dropping packet */
180 	case XDP_DROP:
181 		result = I40E_XDP_CONSUMED;
182 		break;
183 	}
184 	rcu_read_unlock();
185 	return result;
186 }
187 
188 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
189 {
190 	u16 ntu = rx_ring->next_to_use;
191 	union i40e_rx_desc *rx_desc;
192 	struct xdp_buff **bi, *xdp;
193 	dma_addr_t dma;
194 	bool ok = true;
195 
196 	rx_desc = I40E_RX_DESC(rx_ring, ntu);
197 	bi = i40e_rx_bi(rx_ring, ntu);
198 	do {
199 		xdp = xsk_buff_alloc(rx_ring->xsk_pool);
200 		if (!xdp) {
201 			ok = false;
202 			goto no_buffers;
203 		}
204 		*bi = xdp;
205 		dma = xsk_buff_xdp_get_dma(xdp);
206 		rx_desc->read.pkt_addr = cpu_to_le64(dma);
207 		rx_desc->read.hdr_addr = 0;
208 
209 		rx_desc++;
210 		bi++;
211 		ntu++;
212 
213 		if (unlikely(ntu == rx_ring->count)) {
214 			rx_desc = I40E_RX_DESC(rx_ring, 0);
215 			bi = i40e_rx_bi(rx_ring, 0);
216 			ntu = 0;
217 		}
218 	} while (--count);
219 
220 no_buffers:
221 	if (rx_ring->next_to_use != ntu) {
222 		/* clear the status bits for the next_to_use descriptor */
223 		rx_desc->wb.qword1.status_error_len = 0;
224 		i40e_release_rx_desc(rx_ring, ntu);
225 	}
226 
227 	return ok;
228 }
229 
230 /**
231  * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
232  * @rx_ring: Rx ring
233  * @xdp: xdp_buff
234  *
235  * This functions allocates a new skb from a zero-copy Rx buffer.
236  *
237  * Returns the skb, or NULL on failure.
238  **/
239 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
240 					     struct xdp_buff *xdp)
241 {
242 	unsigned int metasize = xdp->data - xdp->data_meta;
243 	unsigned int datasize = xdp->data_end - xdp->data;
244 	struct sk_buff *skb;
245 
246 	/* allocate a skb to store the frags */
247 	skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
248 			       xdp->data_end - xdp->data_hard_start,
249 			       GFP_ATOMIC | __GFP_NOWARN);
250 	if (unlikely(!skb))
251 		goto out;
252 
253 	skb_reserve(skb, xdp->data - xdp->data_hard_start);
254 	memcpy(__skb_put(skb, datasize), xdp->data, datasize);
255 	if (metasize)
256 		skb_metadata_set(skb, metasize);
257 
258 out:
259 	xsk_buff_free(xdp);
260 	return skb;
261 }
262 
263 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
264 				      struct xdp_buff *xdp_buff,
265 				      union i40e_rx_desc *rx_desc,
266 				      unsigned int *rx_packets,
267 				      unsigned int *rx_bytes,
268 				      unsigned int size,
269 				      unsigned int xdp_res)
270 {
271 	struct sk_buff *skb;
272 
273 	*rx_packets = 1;
274 	*rx_bytes = size;
275 
276 	if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX)
277 		return;
278 
279 	if (xdp_res == I40E_XDP_CONSUMED) {
280 		xsk_buff_free(xdp_buff);
281 		return;
282 	}
283 
284 	if (xdp_res == I40E_XDP_PASS) {
285 		/* NB! We are not checking for errors using
286 		 * i40e_test_staterr with
287 		 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
288 		 * SBP is *not* set in PRT_SBPVSI (default not set).
289 		 */
290 		skb = i40e_construct_skb_zc(rx_ring, xdp_buff);
291 		if (!skb) {
292 			rx_ring->rx_stats.alloc_buff_failed++;
293 			*rx_packets = 0;
294 			*rx_bytes = 0;
295 			return;
296 		}
297 
298 		if (eth_skb_pad(skb)) {
299 			*rx_packets = 0;
300 			*rx_bytes = 0;
301 			return;
302 		}
303 
304 		*rx_bytes = skb->len;
305 		i40e_process_skb_fields(rx_ring, rx_desc, skb);
306 		napi_gro_receive(&rx_ring->q_vector->napi, skb);
307 		return;
308 	}
309 
310 	/* Should never get here, as all valid cases have been handled already.
311 	 */
312 	WARN_ON_ONCE(1);
313 }
314 
315 /**
316  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
317  * @rx_ring: Rx ring
318  * @budget: NAPI budget
319  *
320  * Returns amount of work completed
321  **/
322 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
323 {
324 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
325 	u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
326 	u16 next_to_clean = rx_ring->next_to_clean;
327 	u16 count_mask = rx_ring->count - 1;
328 	unsigned int xdp_res, xdp_xmit = 0;
329 	bool failure = false;
330 
331 	while (likely(total_rx_packets < (unsigned int)budget)) {
332 		union i40e_rx_desc *rx_desc;
333 		unsigned int rx_packets;
334 		unsigned int rx_bytes;
335 		struct xdp_buff *bi;
336 		unsigned int size;
337 		u64 qword;
338 
339 		rx_desc = I40E_RX_DESC(rx_ring, next_to_clean);
340 		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
341 
342 		/* This memory barrier is needed to keep us from reading
343 		 * any other fields out of the rx_desc until we have
344 		 * verified the descriptor has been written back.
345 		 */
346 		dma_rmb();
347 
348 		if (i40e_rx_is_programming_status(qword)) {
349 			i40e_clean_programming_status(rx_ring,
350 						      rx_desc->raw.qword[0],
351 						      qword);
352 			bi = *i40e_rx_bi(rx_ring, next_to_clean);
353 			xsk_buff_free(bi);
354 			next_to_clean = (next_to_clean + 1) & count_mask;
355 			continue;
356 		}
357 
358 		size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
359 		       I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
360 		if (!size)
361 			break;
362 
363 		bi = *i40e_rx_bi(rx_ring, next_to_clean);
364 		bi->data_end = bi->data + size;
365 		xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool);
366 
367 		xdp_res = i40e_run_xdp_zc(rx_ring, bi);
368 		i40e_handle_xdp_result_zc(rx_ring, bi, rx_desc, &rx_packets,
369 					  &rx_bytes, size, xdp_res);
370 		total_rx_packets += rx_packets;
371 		total_rx_bytes += rx_bytes;
372 		xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR);
373 		next_to_clean = (next_to_clean + 1) & count_mask;
374 	}
375 
376 	rx_ring->next_to_clean = next_to_clean;
377 	cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask;
378 
379 	if (cleaned_count >= I40E_RX_BUFFER_WRITE)
380 		failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
381 
382 	i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
383 	i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
384 
385 	if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
386 		if (failure || next_to_clean == rx_ring->next_to_use)
387 			xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
388 		else
389 			xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
390 
391 		return (int)total_rx_packets;
392 	}
393 	return failure ? budget : (int)total_rx_packets;
394 }
395 
396 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
397 			  unsigned int *total_bytes)
398 {
399 	struct i40e_tx_desc *tx_desc;
400 	dma_addr_t dma;
401 
402 	dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
403 	xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
404 
405 	tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
406 	tx_desc->buffer_addr = cpu_to_le64(dma);
407 	tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP,
408 						  0, desc->len, 0);
409 
410 	*total_bytes += desc->len;
411 }
412 
413 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
414 				unsigned int *total_bytes)
415 {
416 	u16 ntu = xdp_ring->next_to_use;
417 	struct i40e_tx_desc *tx_desc;
418 	dma_addr_t dma;
419 	u32 i;
420 
421 	loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
422 		dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);
423 		xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);
424 
425 		tx_desc = I40E_TX_DESC(xdp_ring, ntu++);
426 		tx_desc->buffer_addr = cpu_to_le64(dma);
427 		tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC |
428 							  I40E_TX_DESC_CMD_EOP,
429 							  0, desc[i].len, 0);
430 
431 		*total_bytes += desc[i].len;
432 	}
433 
434 	xdp_ring->next_to_use = ntu;
435 }
436 
437 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,
438 				 unsigned int *total_bytes)
439 {
440 	u32 batched, leftover, i;
441 
442 	batched = nb_pkts & ~(PKTS_PER_BATCH - 1);
443 	leftover = nb_pkts & (PKTS_PER_BATCH - 1);
444 	for (i = 0; i < batched; i += PKTS_PER_BATCH)
445 		i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
446 	for (i = batched; i < batched + leftover; i++)
447 		i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);
448 }
449 
450 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
451 {
452 	u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
453 	struct i40e_tx_desc *tx_desc;
454 
455 	tx_desc = I40E_TX_DESC(xdp_ring, ntu);
456 	tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
457 }
458 
459 /**
460  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
461  * @xdp_ring: XDP Tx ring
462  * @budget: NAPI budget
463  *
464  * Returns true if the work is finished.
465  **/
466 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
467 {
468 	struct xdp_desc *descs = xdp_ring->xsk_descs;
469 	u32 nb_pkts, nb_processed = 0;
470 	unsigned int total_bytes = 0;
471 
472 	nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, descs, budget);
473 	if (!nb_pkts)
474 		return false;
475 
476 	if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
477 		nb_processed = xdp_ring->count - xdp_ring->next_to_use;
478 		i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
479 		xdp_ring->next_to_use = 0;
480 	}
481 
482 	i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
483 			     &total_bytes);
484 
485 	/* Request an interrupt for the last frame and bump tail ptr. */
486 	i40e_set_rs_bit(xdp_ring);
487 	i40e_xdp_ring_update_tail(xdp_ring);
488 
489 	i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
490 
491 	return true;
492 }
493 
494 /**
495  * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
496  * @tx_ring: XDP Tx ring
497  * @tx_bi: Tx buffer info to clean
498  **/
499 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
500 				     struct i40e_tx_buffer *tx_bi)
501 {
502 	xdp_return_frame(tx_bi->xdpf);
503 	tx_ring->xdp_tx_active--;
504 	dma_unmap_single(tx_ring->dev,
505 			 dma_unmap_addr(tx_bi, dma),
506 			 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
507 	dma_unmap_len_set(tx_bi, len, 0);
508 }
509 
510 /**
511  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
512  * @vsi: Current VSI
513  * @tx_ring: XDP Tx ring
514  *
515  * Returns true if cleanup/tranmission is done.
516  **/
517 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
518 {
519 	struct xsk_buff_pool *bp = tx_ring->xsk_pool;
520 	u32 i, completed_frames, xsk_frames = 0;
521 	u32 head_idx = i40e_get_head(tx_ring);
522 	struct i40e_tx_buffer *tx_bi;
523 	unsigned int ntc;
524 
525 	if (head_idx < tx_ring->next_to_clean)
526 		head_idx += tx_ring->count;
527 	completed_frames = head_idx - tx_ring->next_to_clean;
528 
529 	if (completed_frames == 0)
530 		goto out_xmit;
531 
532 	if (likely(!tx_ring->xdp_tx_active)) {
533 		xsk_frames = completed_frames;
534 		goto skip;
535 	}
536 
537 	ntc = tx_ring->next_to_clean;
538 
539 	for (i = 0; i < completed_frames; i++) {
540 		tx_bi = &tx_ring->tx_bi[ntc];
541 
542 		if (tx_bi->xdpf) {
543 			i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
544 			tx_bi->xdpf = NULL;
545 		} else {
546 			xsk_frames++;
547 		}
548 
549 		if (++ntc >= tx_ring->count)
550 			ntc = 0;
551 	}
552 
553 skip:
554 	tx_ring->next_to_clean += completed_frames;
555 	if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
556 		tx_ring->next_to_clean -= tx_ring->count;
557 
558 	if (xsk_frames)
559 		xsk_tx_completed(bp, xsk_frames);
560 
561 	i40e_arm_wb(tx_ring, vsi, completed_frames);
562 
563 out_xmit:
564 	if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
565 		xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
566 
567 	return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
568 }
569 
570 /**
571  * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
572  * @dev: the netdevice
573  * @queue_id: queue id to wake up
574  * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
575  *
576  * Returns <0 for errors, 0 otherwise.
577  **/
578 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
579 {
580 	struct i40e_netdev_priv *np = netdev_priv(dev);
581 	struct i40e_vsi *vsi = np->vsi;
582 	struct i40e_pf *pf = vsi->back;
583 	struct i40e_ring *ring;
584 
585 	if (test_bit(__I40E_CONFIG_BUSY, pf->state))
586 		return -EAGAIN;
587 
588 	if (test_bit(__I40E_VSI_DOWN, vsi->state))
589 		return -ENETDOWN;
590 
591 	if (!i40e_enabled_xdp_vsi(vsi))
592 		return -ENXIO;
593 
594 	if (queue_id >= vsi->num_queue_pairs)
595 		return -ENXIO;
596 
597 	if (!vsi->xdp_rings[queue_id]->xsk_pool)
598 		return -ENXIO;
599 
600 	ring = vsi->xdp_rings[queue_id];
601 
602 	/* The idea here is that if NAPI is running, mark a miss, so
603 	 * it will run again. If not, trigger an interrupt and
604 	 * schedule the NAPI from interrupt context. If NAPI would be
605 	 * scheduled here, the interrupt affinity would not be
606 	 * honored.
607 	 */
608 	if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
609 		i40e_force_wb(vsi, ring->q_vector);
610 
611 	return 0;
612 }
613 
614 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
615 {
616 	u16 count_mask = rx_ring->count - 1;
617 	u16 ntc = rx_ring->next_to_clean;
618 	u16 ntu = rx_ring->next_to_use;
619 
620 	for ( ; ntc != ntu; ntc = (ntc + 1)  & count_mask) {
621 		struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc);
622 
623 		xsk_buff_free(rx_bi);
624 	}
625 }
626 
627 /**
628  * i40e_xsk_clean_xdp_ring - Clean the XDP Tx ring on shutdown
629  * @tx_ring: XDP Tx ring
630  **/
631 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
632 {
633 	u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
634 	struct xsk_buff_pool *bp = tx_ring->xsk_pool;
635 	struct i40e_tx_buffer *tx_bi;
636 	u32 xsk_frames = 0;
637 
638 	while (ntc != ntu) {
639 		tx_bi = &tx_ring->tx_bi[ntc];
640 
641 		if (tx_bi->xdpf)
642 			i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
643 		else
644 			xsk_frames++;
645 
646 		tx_bi->xdpf = NULL;
647 
648 		ntc++;
649 		if (ntc >= tx_ring->count)
650 			ntc = 0;
651 	}
652 
653 	if (xsk_frames)
654 		xsk_tx_completed(bp, xsk_frames);
655 }
656 
657 /**
658  * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
659  * buffer pool attached
660  * @vsi: vsi
661  *
662  * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
663  **/
664 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
665 {
666 	struct net_device *netdev = vsi->netdev;
667 	int i;
668 
669 	for (i = 0; i < vsi->num_queue_pairs; i++) {
670 		if (xsk_get_pool_from_qid(netdev, i))
671 			return true;
672 	}
673 
674 	return false;
675 }
676