xref: /linux/drivers/net/ethernet/intel/i40e/i40e_xsk.c (revision ef9226cd56b718c79184a3466d32984a51cb449c)
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2018 Intel Corporation. */
3 
4 #include <linux/bpf_trace.h>
5 #include <net/xdp_sock_drv.h>
6 #include "i40e_txrx_common.h"
7 #include "i40e_xsk.h"
8 
9 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring)
10 {
11 	memset(rx_ring->rx_bi_zc, 0,
12 	       sizeof(*rx_ring->rx_bi_zc) * rx_ring->count);
13 }
14 
15 static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx)
16 {
17 	return &rx_ring->rx_bi_zc[idx];
18 }
19 
20 /**
21  * i40e_realloc_rx_xdp_bi - reallocate SW ring for either XSK or normal buffer
22  * @rx_ring: Current rx ring
23  * @pool_present: is pool for XSK present
24  *
25  * Try allocating memory and return ENOMEM, if failed to allocate.
26  * If allocation was successful, substitute buffer with allocated one.
27  * Returns 0 on success, negative on failure
28  */
29 static int i40e_realloc_rx_xdp_bi(struct i40e_ring *rx_ring, bool pool_present)
30 {
31 	size_t elem_size = pool_present ? sizeof(*rx_ring->rx_bi_zc) :
32 					  sizeof(*rx_ring->rx_bi);
33 	void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL);
34 
35 	if (!sw_ring)
36 		return -ENOMEM;
37 
38 	if (pool_present) {
39 		kfree(rx_ring->rx_bi);
40 		rx_ring->rx_bi = NULL;
41 		rx_ring->rx_bi_zc = sw_ring;
42 	} else {
43 		kfree(rx_ring->rx_bi_zc);
44 		rx_ring->rx_bi_zc = NULL;
45 		rx_ring->rx_bi = sw_ring;
46 	}
47 	return 0;
48 }
49 
50 /**
51  * i40e_realloc_rx_bi_zc - reallocate rx SW rings
52  * @vsi: Current VSI
53  * @zc: is zero copy set
54  *
55  * Reallocate buffer for rx_rings that might be used by XSK.
56  * XDP requires more memory, than rx_buf provides.
57  * Returns 0 on success, negative on failure
58  */
59 int i40e_realloc_rx_bi_zc(struct i40e_vsi *vsi, bool zc)
60 {
61 	struct i40e_ring *rx_ring;
62 	unsigned long q;
63 
64 	for_each_set_bit(q, vsi->af_xdp_zc_qps, vsi->alloc_queue_pairs) {
65 		rx_ring = vsi->rx_rings[q];
66 		if (i40e_realloc_rx_xdp_bi(rx_ring, zc))
67 			return -ENOMEM;
68 	}
69 	return 0;
70 }
71 
72 /**
73  * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a
74  * certain ring/qid
75  * @vsi: Current VSI
76  * @pool: buffer pool
77  * @qid: Rx ring to associate buffer pool with
78  *
79  * Returns 0 on success, <0 on failure
80  **/
81 static int i40e_xsk_pool_enable(struct i40e_vsi *vsi,
82 				struct xsk_buff_pool *pool,
83 				u16 qid)
84 {
85 	struct net_device *netdev = vsi->netdev;
86 	bool if_running;
87 	int err;
88 
89 	if (vsi->type != I40E_VSI_MAIN)
90 		return -EINVAL;
91 
92 	if (qid >= vsi->num_queue_pairs)
93 		return -EINVAL;
94 
95 	if (qid >= netdev->real_num_rx_queues ||
96 	    qid >= netdev->real_num_tx_queues)
97 		return -EINVAL;
98 
99 	err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR);
100 	if (err)
101 		return err;
102 
103 	set_bit(qid, vsi->af_xdp_zc_qps);
104 
105 	if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
106 
107 	if (if_running) {
108 		err = i40e_queue_pair_disable(vsi, qid);
109 		if (err)
110 			return err;
111 
112 		err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], true);
113 		if (err)
114 			return err;
115 
116 		err = i40e_queue_pair_enable(vsi, qid);
117 		if (err)
118 			return err;
119 
120 		/* Kick start the NAPI context so that receiving will start */
121 		err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX);
122 		if (err)
123 			return err;
124 	}
125 
126 	return 0;
127 }
128 
129 /**
130  * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a
131  * certain ring/qid
132  * @vsi: Current VSI
133  * @qid: Rx ring to associate buffer pool with
134  *
135  * Returns 0 on success, <0 on failure
136  **/
137 static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid)
138 {
139 	struct net_device *netdev = vsi->netdev;
140 	struct xsk_buff_pool *pool;
141 	bool if_running;
142 	int err;
143 
144 	pool = xsk_get_pool_from_qid(netdev, qid);
145 	if (!pool)
146 		return -EINVAL;
147 
148 	if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
149 
150 	if (if_running) {
151 		err = i40e_queue_pair_disable(vsi, qid);
152 		if (err)
153 			return err;
154 	}
155 
156 	clear_bit(qid, vsi->af_xdp_zc_qps);
157 	xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR);
158 
159 	if (if_running) {
160 		err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], false);
161 		if (err)
162 			return err;
163 		err = i40e_queue_pair_enable(vsi, qid);
164 		if (err)
165 			return err;
166 	}
167 
168 	return 0;
169 }
170 
171 /**
172  * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from
173  * a ring/qid
174  * @vsi: Current VSI
175  * @pool: Buffer pool to enable/associate to a ring, or NULL to disable
176  * @qid: Rx ring to (dis)associate buffer pool (from)to
177  *
178  * This function enables or disables a buffer pool to a certain ring.
179  *
180  * Returns 0 on success, <0 on failure
181  **/
182 int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool,
183 			u16 qid)
184 {
185 	return pool ? i40e_xsk_pool_enable(vsi, pool, qid) :
186 		i40e_xsk_pool_disable(vsi, qid);
187 }
188 
189 /**
190  * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff
191  * @rx_ring: Rx ring
192  * @xdp: xdp_buff used as input to the XDP program
193  * @xdp_prog: XDP program to run
194  *
195  * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
196  **/
197 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp,
198 			   struct bpf_prog *xdp_prog)
199 {
200 	int err, result = I40E_XDP_PASS;
201 	struct i40e_ring *xdp_ring;
202 	u32 act;
203 
204 	act = bpf_prog_run_xdp(xdp_prog, xdp);
205 
206 	if (likely(act == XDP_REDIRECT)) {
207 		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
208 		if (!err)
209 			return I40E_XDP_REDIR;
210 		if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS)
211 			result = I40E_XDP_EXIT;
212 		else
213 			result = I40E_XDP_CONSUMED;
214 		goto out_failure;
215 	}
216 
217 	switch (act) {
218 	case XDP_PASS:
219 		break;
220 	case XDP_TX:
221 		xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
222 		result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
223 		if (result == I40E_XDP_CONSUMED)
224 			goto out_failure;
225 		break;
226 	case XDP_DROP:
227 		result = I40E_XDP_CONSUMED;
228 		break;
229 	default:
230 		bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
231 		fallthrough;
232 	case XDP_ABORTED:
233 		result = I40E_XDP_CONSUMED;
234 out_failure:
235 		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
236 	}
237 	return result;
238 }
239 
240 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
241 {
242 	u16 ntu = rx_ring->next_to_use;
243 	union i40e_rx_desc *rx_desc;
244 	struct xdp_buff **xdp;
245 	u32 nb_buffs, i;
246 	dma_addr_t dma;
247 
248 	rx_desc = I40E_RX_DESC(rx_ring, ntu);
249 	xdp = i40e_rx_bi(rx_ring, ntu);
250 
251 	nb_buffs = min_t(u16, count, rx_ring->count - ntu);
252 	nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs);
253 	if (!nb_buffs)
254 		return false;
255 
256 	i = nb_buffs;
257 	while (i--) {
258 		dma = xsk_buff_xdp_get_dma(*xdp);
259 		rx_desc->read.pkt_addr = cpu_to_le64(dma);
260 		rx_desc->read.hdr_addr = 0;
261 
262 		rx_desc++;
263 		xdp++;
264 	}
265 
266 	ntu += nb_buffs;
267 	if (ntu == rx_ring->count) {
268 		rx_desc = I40E_RX_DESC(rx_ring, 0);
269 		ntu = 0;
270 	}
271 
272 	/* clear the status bits for the next_to_use descriptor */
273 	rx_desc->wb.qword1.status_error_len = 0;
274 	i40e_release_rx_desc(rx_ring, ntu);
275 
276 	return count == nb_buffs;
277 }
278 
279 /**
280  * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
281  * @rx_ring: Rx ring
282  * @xdp: xdp_buff
283  *
284  * This functions allocates a new skb from a zero-copy Rx buffer.
285  *
286  * Returns the skb, or NULL on failure.
287  **/
288 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
289 					     struct xdp_buff *xdp)
290 {
291 	unsigned int totalsize = xdp->data_end - xdp->data_meta;
292 	unsigned int metasize = xdp->data - xdp->data_meta;
293 	struct skb_shared_info *sinfo = NULL;
294 	struct sk_buff *skb;
295 	u32 nr_frags = 0;
296 
297 	if (unlikely(xdp_buff_has_frags(xdp))) {
298 		sinfo = xdp_get_shared_info_from_buff(xdp);
299 		nr_frags = sinfo->nr_frags;
300 	}
301 	net_prefetch(xdp->data_meta);
302 
303 	/* allocate a skb to store the frags */
304 	skb = napi_alloc_skb(&rx_ring->q_vector->napi, totalsize);
305 	if (unlikely(!skb))
306 		goto out;
307 
308 	memcpy(__skb_put(skb, totalsize), xdp->data_meta,
309 	       ALIGN(totalsize, sizeof(long)));
310 
311 	if (metasize) {
312 		skb_metadata_set(skb, metasize);
313 		__skb_pull(skb, metasize);
314 	}
315 
316 	if (likely(!xdp_buff_has_frags(xdp)))
317 		goto out;
318 
319 	for (int i = 0; i < nr_frags; i++) {
320 		struct skb_shared_info *skinfo = skb_shinfo(skb);
321 		skb_frag_t *frag = &sinfo->frags[i];
322 		struct page *page;
323 		void *addr;
324 
325 		page = dev_alloc_page();
326 		if (!page) {
327 			dev_kfree_skb(skb);
328 			return NULL;
329 		}
330 		addr = page_to_virt(page);
331 
332 		memcpy(addr, skb_frag_page(frag), skb_frag_size(frag));
333 
334 		__skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++,
335 					   addr, 0, skb_frag_size(frag));
336 	}
337 
338 out:
339 	xsk_buff_free(xdp);
340 	return skb;
341 }
342 
343 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
344 				      struct xdp_buff *xdp_buff,
345 				      union i40e_rx_desc *rx_desc,
346 				      unsigned int *rx_packets,
347 				      unsigned int *rx_bytes,
348 				      unsigned int xdp_res,
349 				      bool *failure)
350 {
351 	struct sk_buff *skb;
352 
353 	*rx_packets = 1;
354 	*rx_bytes = xdp_get_buff_len(xdp_buff);
355 
356 	if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX)
357 		return;
358 
359 	if (xdp_res == I40E_XDP_EXIT) {
360 		*failure = true;
361 		return;
362 	}
363 
364 	if (xdp_res == I40E_XDP_CONSUMED) {
365 		xsk_buff_free(xdp_buff);
366 		return;
367 	}
368 	if (xdp_res == I40E_XDP_PASS) {
369 		/* NB! We are not checking for errors using
370 		 * i40e_test_staterr with
371 		 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
372 		 * SBP is *not* set in PRT_SBPVSI (default not set).
373 		 */
374 		skb = i40e_construct_skb_zc(rx_ring, xdp_buff);
375 		if (!skb) {
376 			rx_ring->rx_stats.alloc_buff_failed++;
377 			*rx_packets = 0;
378 			*rx_bytes = 0;
379 			return;
380 		}
381 
382 		if (eth_skb_pad(skb)) {
383 			*rx_packets = 0;
384 			*rx_bytes = 0;
385 			return;
386 		}
387 
388 		i40e_process_skb_fields(rx_ring, rx_desc, skb);
389 		napi_gro_receive(&rx_ring->q_vector->napi, skb);
390 		return;
391 	}
392 
393 	/* Should never get here, as all valid cases have been handled already.
394 	 */
395 	WARN_ON_ONCE(1);
396 }
397 
398 static int
399 i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first,
400 		  struct xdp_buff *xdp, const unsigned int size)
401 {
402 	struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first);
403 
404 	if (!xdp_buff_has_frags(first)) {
405 		sinfo->nr_frags = 0;
406 		sinfo->xdp_frags_size = 0;
407 		xdp_buff_set_frags_flag(first);
408 	}
409 
410 	if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) {
411 		xsk_buff_free(first);
412 		return -ENOMEM;
413 	}
414 
415 	__skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++,
416 				   virt_to_page(xdp->data_hard_start),
417 				   XDP_PACKET_HEADROOM, size);
418 	sinfo->xdp_frags_size += size;
419 	xsk_buff_add_frag(xdp);
420 
421 	return 0;
422 }
423 
424 /**
425  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
426  * @rx_ring: Rx ring
427  * @budget: NAPI budget
428  *
429  * Returns amount of work completed
430  **/
431 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
432 {
433 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
434 	u16 next_to_process = rx_ring->next_to_process;
435 	u16 next_to_clean = rx_ring->next_to_clean;
436 	unsigned int xdp_res, xdp_xmit = 0;
437 	struct xdp_buff *first = NULL;
438 	u32 count = rx_ring->count;
439 	struct bpf_prog *xdp_prog;
440 	u32 entries_to_alloc;
441 	bool failure = false;
442 
443 	if (next_to_process != next_to_clean)
444 		first = *i40e_rx_bi(rx_ring, next_to_clean);
445 
446 	/* NB! xdp_prog will always be !NULL, due to the fact that
447 	 * this path is enabled by setting an XDP program.
448 	 */
449 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
450 
451 	while (likely(total_rx_packets < (unsigned int)budget)) {
452 		union i40e_rx_desc *rx_desc;
453 		unsigned int rx_packets;
454 		unsigned int rx_bytes;
455 		struct xdp_buff *bi;
456 		unsigned int size;
457 		u64 qword;
458 
459 		rx_desc = I40E_RX_DESC(rx_ring, next_to_process);
460 		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
461 
462 		/* This memory barrier is needed to keep us from reading
463 		 * any other fields out of the rx_desc until we have
464 		 * verified the descriptor has been written back.
465 		 */
466 		dma_rmb();
467 
468 		if (i40e_rx_is_programming_status(qword)) {
469 			i40e_clean_programming_status(rx_ring,
470 						      rx_desc->raw.qword[0],
471 						      qword);
472 			bi = *i40e_rx_bi(rx_ring, next_to_process);
473 			xsk_buff_free(bi);
474 			if (++next_to_process == count)
475 				next_to_process = 0;
476 			continue;
477 		}
478 
479 		size = FIELD_GET(I40E_RXD_QW1_LENGTH_PBUF_MASK, qword);
480 		if (!size)
481 			break;
482 
483 		bi = *i40e_rx_bi(rx_ring, next_to_process);
484 		xsk_buff_set_size(bi, size);
485 		xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool);
486 
487 		if (!first)
488 			first = bi;
489 		else if (i40e_add_xsk_frag(rx_ring, first, bi, size))
490 			break;
491 
492 		if (++next_to_process == count)
493 			next_to_process = 0;
494 
495 		if (i40e_is_non_eop(rx_ring, rx_desc))
496 			continue;
497 
498 		xdp_res = i40e_run_xdp_zc(rx_ring, first, xdp_prog);
499 		i40e_handle_xdp_result_zc(rx_ring, first, rx_desc, &rx_packets,
500 					  &rx_bytes, xdp_res, &failure);
501 		next_to_clean = next_to_process;
502 		if (failure)
503 			break;
504 		total_rx_packets += rx_packets;
505 		total_rx_bytes += rx_bytes;
506 		xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR);
507 		first = NULL;
508 	}
509 
510 	rx_ring->next_to_clean = next_to_clean;
511 	rx_ring->next_to_process = next_to_process;
512 
513 	entries_to_alloc = I40E_DESC_UNUSED(rx_ring);
514 	if (entries_to_alloc >= I40E_RX_BUFFER_WRITE)
515 		failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc);
516 
517 	i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
518 	i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
519 
520 	if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
521 		if (failure || next_to_clean == rx_ring->next_to_use)
522 			xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
523 		else
524 			xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
525 
526 		return (int)total_rx_packets;
527 	}
528 	return failure ? budget : (int)total_rx_packets;
529 }
530 
531 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
532 			  unsigned int *total_bytes)
533 {
534 	u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(desc);
535 	struct i40e_tx_desc *tx_desc;
536 	dma_addr_t dma;
537 
538 	dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
539 	xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
540 
541 	tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
542 	tx_desc->buffer_addr = cpu_to_le64(dma);
543 	tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc->len, 0);
544 
545 	*total_bytes += desc->len;
546 }
547 
548 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
549 				unsigned int *total_bytes)
550 {
551 	u16 ntu = xdp_ring->next_to_use;
552 	struct i40e_tx_desc *tx_desc;
553 	dma_addr_t dma;
554 	u32 i;
555 
556 	loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
557 		u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(&desc[i]);
558 
559 		dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);
560 		xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);
561 
562 		tx_desc = I40E_TX_DESC(xdp_ring, ntu++);
563 		tx_desc->buffer_addr = cpu_to_le64(dma);
564 		tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc[i].len, 0);
565 
566 		*total_bytes += desc[i].len;
567 	}
568 
569 	xdp_ring->next_to_use = ntu;
570 }
571 
572 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,
573 				 unsigned int *total_bytes)
574 {
575 	u32 batched, leftover, i;
576 
577 	batched = nb_pkts & ~(PKTS_PER_BATCH - 1);
578 	leftover = nb_pkts & (PKTS_PER_BATCH - 1);
579 	for (i = 0; i < batched; i += PKTS_PER_BATCH)
580 		i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
581 	for (i = batched; i < batched + leftover; i++)
582 		i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);
583 }
584 
585 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
586 {
587 	u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
588 	struct i40e_tx_desc *tx_desc;
589 
590 	tx_desc = I40E_TX_DESC(xdp_ring, ntu);
591 	tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
592 }
593 
594 /**
595  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
596  * @xdp_ring: XDP Tx ring
597  * @budget: NAPI budget
598  *
599  * Returns true if the work is finished.
600  **/
601 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
602 {
603 	struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
604 	u32 nb_pkts, nb_processed = 0;
605 	unsigned int total_bytes = 0;
606 
607 	nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
608 	if (!nb_pkts)
609 		return true;
610 
611 	if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
612 		nb_processed = xdp_ring->count - xdp_ring->next_to_use;
613 		i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
614 		xdp_ring->next_to_use = 0;
615 	}
616 
617 	i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
618 			     &total_bytes);
619 
620 	/* Request an interrupt for the last frame and bump tail ptr. */
621 	i40e_set_rs_bit(xdp_ring);
622 	i40e_xdp_ring_update_tail(xdp_ring);
623 
624 	i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
625 
626 	return nb_pkts < budget;
627 }
628 
629 /**
630  * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
631  * @tx_ring: XDP Tx ring
632  * @tx_bi: Tx buffer info to clean
633  **/
634 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
635 				     struct i40e_tx_buffer *tx_bi)
636 {
637 	xdp_return_frame(tx_bi->xdpf);
638 	tx_ring->xdp_tx_active--;
639 	dma_unmap_single(tx_ring->dev,
640 			 dma_unmap_addr(tx_bi, dma),
641 			 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
642 	dma_unmap_len_set(tx_bi, len, 0);
643 }
644 
645 /**
646  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
647  * @vsi: Current VSI
648  * @tx_ring: XDP Tx ring
649  *
650  * Returns true if cleanup/transmission is done.
651  **/
652 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
653 {
654 	struct xsk_buff_pool *bp = tx_ring->xsk_pool;
655 	u32 i, completed_frames, xsk_frames = 0;
656 	u32 head_idx = i40e_get_head(tx_ring);
657 	struct i40e_tx_buffer *tx_bi;
658 	unsigned int ntc;
659 
660 	if (head_idx < tx_ring->next_to_clean)
661 		head_idx += tx_ring->count;
662 	completed_frames = head_idx - tx_ring->next_to_clean;
663 
664 	if (completed_frames == 0)
665 		goto out_xmit;
666 
667 	if (likely(!tx_ring->xdp_tx_active)) {
668 		xsk_frames = completed_frames;
669 		goto skip;
670 	}
671 
672 	ntc = tx_ring->next_to_clean;
673 
674 	for (i = 0; i < completed_frames; i++) {
675 		tx_bi = &tx_ring->tx_bi[ntc];
676 
677 		if (tx_bi->xdpf) {
678 			i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
679 			tx_bi->xdpf = NULL;
680 		} else {
681 			xsk_frames++;
682 		}
683 
684 		if (++ntc >= tx_ring->count)
685 			ntc = 0;
686 	}
687 
688 skip:
689 	tx_ring->next_to_clean += completed_frames;
690 	if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
691 		tx_ring->next_to_clean -= tx_ring->count;
692 
693 	if (xsk_frames)
694 		xsk_tx_completed(bp, xsk_frames);
695 
696 	i40e_arm_wb(tx_ring, vsi, completed_frames);
697 
698 out_xmit:
699 	if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
700 		xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
701 
702 	return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
703 }
704 
705 /**
706  * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
707  * @dev: the netdevice
708  * @queue_id: queue id to wake up
709  * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
710  *
711  * Returns <0 for errors, 0 otherwise.
712  **/
713 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
714 {
715 	struct i40e_netdev_priv *np = netdev_priv(dev);
716 	struct i40e_vsi *vsi = np->vsi;
717 	struct i40e_pf *pf = vsi->back;
718 	struct i40e_ring *ring;
719 
720 	if (test_bit(__I40E_CONFIG_BUSY, pf->state))
721 		return -EAGAIN;
722 
723 	if (test_bit(__I40E_VSI_DOWN, vsi->state))
724 		return -ENETDOWN;
725 
726 	if (!i40e_enabled_xdp_vsi(vsi))
727 		return -EINVAL;
728 
729 	if (queue_id >= vsi->num_queue_pairs)
730 		return -EINVAL;
731 
732 	if (!vsi->xdp_rings[queue_id]->xsk_pool)
733 		return -EINVAL;
734 
735 	ring = vsi->xdp_rings[queue_id];
736 
737 	/* The idea here is that if NAPI is running, mark a miss, so
738 	 * it will run again. If not, trigger an interrupt and
739 	 * schedule the NAPI from interrupt context. If NAPI would be
740 	 * scheduled here, the interrupt affinity would not be
741 	 * honored.
742 	 */
743 	if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
744 		i40e_force_wb(vsi, ring->q_vector);
745 
746 	return 0;
747 }
748 
749 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
750 {
751 	u16 ntc = rx_ring->next_to_clean;
752 	u16 ntu = rx_ring->next_to_use;
753 
754 	while (ntc != ntu) {
755 		struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc);
756 
757 		xsk_buff_free(rx_bi);
758 		ntc++;
759 		if (ntc >= rx_ring->count)
760 			ntc = 0;
761 	}
762 }
763 
764 /**
765  * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown
766  * @tx_ring: XDP Tx ring
767  **/
768 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
769 {
770 	u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
771 	struct xsk_buff_pool *bp = tx_ring->xsk_pool;
772 	struct i40e_tx_buffer *tx_bi;
773 	u32 xsk_frames = 0;
774 
775 	while (ntc != ntu) {
776 		tx_bi = &tx_ring->tx_bi[ntc];
777 
778 		if (tx_bi->xdpf)
779 			i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
780 		else
781 			xsk_frames++;
782 
783 		tx_bi->xdpf = NULL;
784 
785 		ntc++;
786 		if (ntc >= tx_ring->count)
787 			ntc = 0;
788 	}
789 
790 	if (xsk_frames)
791 		xsk_tx_completed(bp, xsk_frames);
792 }
793 
794 /**
795  * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
796  * buffer pool attached
797  * @vsi: vsi
798  *
799  * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
800  **/
801 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
802 {
803 	struct net_device *netdev = vsi->netdev;
804 	int i;
805 
806 	for (i = 0; i < vsi->num_queue_pairs; i++) {
807 		if (xsk_get_pool_from_qid(netdev, i))
808 			return true;
809 	}
810 
811 	return false;
812 }
813