i40e_xsk.c

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