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
i40e_clear_rx_bi_zc(struct i40e_ring * rx_ring)10 void 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
i40e_rx_bi(struct i40e_ring * rx_ring,u32 idx)16 static 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 */
i40e_realloc_rx_xdp_bi(struct i40e_ring * rx_ring,bool pool_present)30 static 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 */
i40e_realloc_rx_bi_zc(struct i40e_vsi * vsi,bool zc)60 int 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 **/
i40e_xsk_pool_enable(struct i40e_vsi * vsi,struct xsk_buff_pool * pool,u16 qid)82 static 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 **/
i40e_xsk_pool_disable(struct i40e_vsi * vsi,u16 qid)138 static 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 **/
i40e_xsk_pool_setup(struct i40e_vsi * vsi,struct xsk_buff_pool * pool,u16 qid)183 int 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 **/
i40e_run_xdp_zc(struct i40e_ring * rx_ring,struct xdp_buff * xdp,struct bpf_prog * xdp_prog)198 static 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;
235 out_failure:
236 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
237 }
238 return result;
239 }
240
i40e_alloc_rx_buffers_zc(struct i40e_ring * rx_ring,u16 count)241 bool 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 **/
i40e_construct_skb_zc(struct i40e_ring * rx_ring,struct xdp_buff * xdp)289 static 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
339 out:
340 xsk_buff_free(xdp);
341 return skb;
342 }
343
i40e_handle_xdp_result_zc(struct i40e_ring * rx_ring,struct xdp_buff * xdp_buff,union i40e_rx_desc * rx_desc,unsigned int * rx_packets,unsigned int * rx_bytes,unsigned int xdp_res,bool * failure)344 static 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 **/
i40e_clean_rx_irq_zc(struct i40e_ring * rx_ring,int budget)406 int 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
i40e_xmit_pkt(struct i40e_ring * xdp_ring,struct xdp_desc * desc,unsigned int * total_bytes)508 static 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
i40e_xmit_pkt_batch(struct i40e_ring * xdp_ring,struct xdp_desc * desc,unsigned int * total_bytes)525 static 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
i40e_fill_tx_hw_ring(struct i40e_ring * xdp_ring,struct xdp_desc * descs,u32 nb_pkts,unsigned int * total_bytes)550 static 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
i40e_set_rs_bit(struct i40e_ring * xdp_ring)563 static 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 **/
i40e_xmit_zc(struct i40e_ring * xdp_ring,unsigned int budget)579 static 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 **/
i40e_clean_xdp_tx_buffer(struct i40e_ring * tx_ring,struct i40e_tx_buffer * tx_bi)612 static 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 **/
i40e_clean_xdp_tx_irq(struct i40e_vsi * vsi,struct i40e_ring * tx_ring)630 bool 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
666 skip:
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
676 out_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 **/
i40e_xsk_wakeup(struct net_device * dev,u32 queue_id,u32 flags)691 int 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
i40e_xsk_clean_rx_ring(struct i40e_ring * rx_ring)727 void 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 **/
i40e_xsk_clean_tx_ring(struct i40e_ring * tx_ring)746 void 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 **/
i40e_xsk_any_rx_ring_enabled(struct i40e_vsi * vsi)779 bool 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 }
791