1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2015-2019 Netronome Systems, Inc. */
3
4 #include <linux/bpf_trace.h>
5 #include <linux/netdevice.h>
6 #include <linux/overflow.h>
7 #include <linux/sizes.h>
8 #include <linux/bitfield.h>
9
10 #include "../nfp_app.h"
11 #include "../nfp_net.h"
12 #include "../nfp_net_dp.h"
13 #include "../crypto/crypto.h"
14 #include "../crypto/fw.h"
15 #include "nfdk.h"
16
nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring * tx_ring)17 static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
18 {
19 return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2);
20 }
21
nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring * tx_ring)22 static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
23 {
24 return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT);
25 }
26
nfp_nfdk_tx_ring_stop(struct netdev_queue * nd_q,struct nfp_net_tx_ring * tx_ring)27 static void nfp_nfdk_tx_ring_stop(struct netdev_queue *nd_q,
28 struct nfp_net_tx_ring *tx_ring)
29 {
30 netif_tx_stop_queue(nd_q);
31
32 /* We can race with the TX completion out of NAPI so recheck */
33 smp_mb();
34 if (unlikely(nfp_nfdk_tx_ring_should_wake(tx_ring)))
35 netif_tx_start_queue(nd_q);
36 }
37
38 static __le64
nfp_nfdk_tx_tso(struct nfp_net_r_vector * r_vec,struct nfp_nfdk_tx_buf * txbuf,struct sk_buff * skb)39 nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf,
40 struct sk_buff *skb)
41 {
42 u32 segs, hdrlen, l3_offset, l4_offset;
43 struct nfp_nfdk_tx_desc txd;
44 u16 mss;
45
46 if (!skb->encapsulation) {
47 l3_offset = skb_network_offset(skb);
48 l4_offset = skb_transport_offset(skb);
49 hdrlen = skb_tcp_all_headers(skb);
50 } else {
51 l3_offset = skb_inner_network_offset(skb);
52 l4_offset = skb_inner_transport_offset(skb);
53 hdrlen = skb_inner_tcp_all_headers(skb);
54 }
55
56 segs = skb_shinfo(skb)->gso_segs;
57 mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK;
58
59 txd.l3_offset = l3_offset;
60 txd.l4_offset = l4_offset;
61 txd.lso_meta_res = 0;
62 txd.mss = cpu_to_le16(mss);
63 txd.lso_hdrlen = hdrlen;
64 txd.lso_totsegs = segs;
65
66 txbuf->pkt_cnt = segs;
67 txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1);
68
69 u64_stats_update_begin(&r_vec->tx_sync);
70 r_vec->tx_lso++;
71 u64_stats_update_end(&r_vec->tx_sync);
72
73 return txd.raw;
74 }
75
76 static u8
nfp_nfdk_tx_csum(struct nfp_net_dp * dp,struct nfp_net_r_vector * r_vec,unsigned int pkt_cnt,struct sk_buff * skb,u64 flags)77 nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
78 unsigned int pkt_cnt, struct sk_buff *skb, u64 flags)
79 {
80 struct ipv6hdr *ipv6h;
81 struct iphdr *iph;
82
83 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
84 return flags;
85
86 if (skb->ip_summed != CHECKSUM_PARTIAL)
87 return flags;
88
89 flags |= NFDK_DESC_TX_L4_CSUM;
90
91 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
92 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
93
94 /* L3 checksum offloading flag is not required for ipv6 */
95 if (iph->version == 4) {
96 flags |= NFDK_DESC_TX_L3_CSUM;
97 } else if (ipv6h->version != 6) {
98 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
99 return flags;
100 }
101
102 u64_stats_update_begin(&r_vec->tx_sync);
103 if (!skb->encapsulation) {
104 r_vec->hw_csum_tx += pkt_cnt;
105 } else {
106 flags |= NFDK_DESC_TX_ENCAP;
107 r_vec->hw_csum_tx_inner += pkt_cnt;
108 }
109 u64_stats_update_end(&r_vec->tx_sync);
110
111 return flags;
112 }
113
114 static int
nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring * tx_ring,struct sk_buff * skb)115 nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring,
116 struct sk_buff *skb)
117 {
118 unsigned int n_descs, wr_p, nop_slots;
119 const skb_frag_t *frag, *fend;
120 struct nfp_nfdk_tx_desc *txd;
121 unsigned int nr_frags;
122 unsigned int wr_idx;
123 int err;
124
125 recount_descs:
126 n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb));
127 nr_frags = skb_shinfo(skb)->nr_frags;
128 frag = skb_shinfo(skb)->frags;
129 fend = frag + nr_frags;
130 for (; frag < fend; frag++)
131 n_descs += DIV_ROUND_UP(skb_frag_size(frag),
132 NFDK_TX_MAX_DATA_PER_DESC);
133
134 if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) {
135 if (skb_is_nonlinear(skb)) {
136 err = skb_linearize(skb);
137 if (err)
138 return err;
139 goto recount_descs;
140 }
141 return -EINVAL;
142 }
143
144 /* Under count by 1 (don't count meta) for the round down to work out */
145 n_descs += !!skb_is_gso(skb);
146
147 if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
148 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT))
149 goto close_block;
150
151 if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK)
152 goto close_block;
153
154 return 0;
155
156 close_block:
157 wr_p = tx_ring->wr_p;
158 nop_slots = D_BLOCK_CPL(wr_p);
159
160 wr_idx = D_IDX(tx_ring, wr_p);
161 tx_ring->ktxbufs[wr_idx].skb = NULL;
162 txd = &tx_ring->ktxds[wr_idx];
163
164 memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
165
166 tx_ring->data_pending = 0;
167 tx_ring->wr_p += nop_slots;
168 tx_ring->wr_ptr_add += nop_slots;
169
170 return 0;
171 }
172
173 static int
nfp_nfdk_prep_tx_meta(struct nfp_net_dp * dp,struct nfp_app * app,struct sk_buff * skb)174 nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app,
175 struct sk_buff *skb)
176 {
177 struct metadata_dst *md_dst = skb_metadata_dst(skb);
178 unsigned char *data;
179 bool vlan_insert;
180 u32 meta_id = 0;
181 int md_bytes;
182
183 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX))
184 md_dst = NULL;
185
186 vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2);
187
188 if (!(md_dst || vlan_insert))
189 return 0;
190
191 md_bytes = sizeof(meta_id) +
192 !!md_dst * NFP_NET_META_PORTID_SIZE +
193 vlan_insert * NFP_NET_META_VLAN_SIZE;
194
195 if (unlikely(skb_cow_head(skb, md_bytes)))
196 return -ENOMEM;
197
198 data = skb_push(skb, md_bytes) + md_bytes;
199 if (md_dst) {
200 data -= NFP_NET_META_PORTID_SIZE;
201 put_unaligned_be32(md_dst->u.port_info.port_id, data);
202 meta_id = NFP_NET_META_PORTID;
203 }
204 if (vlan_insert) {
205 data -= NFP_NET_META_VLAN_SIZE;
206 /* data type of skb->vlan_proto is __be16
207 * so it fills metadata without calling put_unaligned_be16
208 */
209 memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto));
210 put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto));
211 meta_id <<= NFP_NET_META_FIELD_SIZE;
212 meta_id |= NFP_NET_META_VLAN;
213 }
214
215 meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) |
216 FIELD_PREP(NFDK_META_FIELDS, meta_id);
217
218 data -= sizeof(meta_id);
219 put_unaligned_be32(meta_id, data);
220
221 return NFDK_DESC_TX_CHAIN_META;
222 }
223
224 /**
225 * nfp_nfdk_tx() - Main transmit entry point
226 * @skb: SKB to transmit
227 * @netdev: netdev structure
228 *
229 * Return: NETDEV_TX_OK on success.
230 */
nfp_nfdk_tx(struct sk_buff * skb,struct net_device * netdev)231 netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
232 {
233 struct nfp_net *nn = netdev_priv(netdev);
234 struct nfp_nfdk_tx_buf *txbuf, *etxbuf;
235 u32 cnt, tmp_dlen, dlen_type = 0;
236 struct nfp_net_tx_ring *tx_ring;
237 struct nfp_net_r_vector *r_vec;
238 const skb_frag_t *frag, *fend;
239 struct nfp_nfdk_tx_desc *txd;
240 unsigned int real_len, qidx;
241 unsigned int dma_len, type;
242 struct netdev_queue *nd_q;
243 struct nfp_net_dp *dp;
244 int nr_frags, wr_idx;
245 dma_addr_t dma_addr;
246 u64 metadata;
247
248 dp = &nn->dp;
249 qidx = skb_get_queue_mapping(skb);
250 tx_ring = &dp->tx_rings[qidx];
251 r_vec = tx_ring->r_vec;
252 nd_q = netdev_get_tx_queue(dp->netdev, qidx);
253
254 /* Don't bother counting frags, assume the worst */
255 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
256 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",
257 qidx, tx_ring->wr_p, tx_ring->rd_p);
258 netif_tx_stop_queue(nd_q);
259 nfp_net_tx_xmit_more_flush(tx_ring);
260 u64_stats_update_begin(&r_vec->tx_sync);
261 r_vec->tx_busy++;
262 u64_stats_update_end(&r_vec->tx_sync);
263 return NETDEV_TX_BUSY;
264 }
265
266 metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb);
267 if (unlikely((int)metadata < 0))
268 goto err_flush;
269
270 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
271 goto err_flush;
272
273 /* nr_frags will change after skb_linearize so we get nr_frags after
274 * nfp_nfdk_tx_maybe_close_block function
275 */
276 nr_frags = skb_shinfo(skb)->nr_frags;
277 /* DMA map all */
278 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
279 txd = &tx_ring->ktxds[wr_idx];
280 txbuf = &tx_ring->ktxbufs[wr_idx];
281
282 dma_len = skb_headlen(skb);
283 if (skb_is_gso(skb))
284 type = NFDK_DESC_TX_TYPE_TSO;
285 else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
286 type = NFDK_DESC_TX_TYPE_SIMPLE;
287 else
288 type = NFDK_DESC_TX_TYPE_GATHER;
289
290 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
291 if (dma_mapping_error(dp->dev, dma_addr))
292 goto err_warn_dma;
293
294 txbuf->skb = skb;
295 txbuf++;
296
297 txbuf->dma_addr = dma_addr;
298 txbuf++;
299
300 /* FIELD_PREP() implicitly truncates to chunk */
301 dma_len -= 1;
302
303 /* We will do our best to pass as much data as we can in descriptor
304 * and we need to make sure the first descriptor includes whole head
305 * since there is limitation in firmware side. Sometimes the value of
306 * dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than
307 * headlen.
308 */
309 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
310 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
311 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
312 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
313
314 txd->dma_len_type = cpu_to_le16(dlen_type);
315 nfp_desc_set_dma_addr_48b(txd, dma_addr);
316
317 /* starts at bit 0 */
318 BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1));
319
320 /* Preserve the original dlen_type, this way below the EOP logic
321 * can use dlen_type.
322 */
323 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
324 dma_len -= tmp_dlen;
325 dma_addr += tmp_dlen + 1;
326 txd++;
327
328 /* The rest of the data (if any) will be in larger dma descritors
329 * and is handled with the fragment loop.
330 */
331 frag = skb_shinfo(skb)->frags;
332 fend = frag + nr_frags;
333
334 while (true) {
335 while (dma_len > 0) {
336 dma_len -= 1;
337 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
338
339 txd->dma_len_type = cpu_to_le16(dlen_type);
340 nfp_desc_set_dma_addr_48b(txd, dma_addr);
341
342 dma_len -= dlen_type;
343 dma_addr += dlen_type + 1;
344 txd++;
345 }
346
347 if (frag >= fend)
348 break;
349
350 dma_len = skb_frag_size(frag);
351 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len,
352 DMA_TO_DEVICE);
353 if (dma_mapping_error(dp->dev, dma_addr))
354 goto err_unmap;
355
356 txbuf->dma_addr = dma_addr;
357 txbuf++;
358
359 frag++;
360 }
361
362 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
363
364 if (!skb_is_gso(skb)) {
365 real_len = skb->len;
366 /* Metadata desc */
367 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
368 txd->raw = cpu_to_le64(metadata);
369 txd++;
370 } else {
371 /* lso desc should be placed after metadata desc */
372 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);
373 real_len = txbuf->real_len;
374 /* Metadata desc */
375 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
376 txd->raw = cpu_to_le64(metadata);
377 txd += 2;
378 txbuf++;
379 }
380
381 cnt = txd - tx_ring->ktxds - wr_idx;
382 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
383 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
384 goto err_warn_overflow;
385
386 skb_tx_timestamp(skb);
387
388 tx_ring->wr_p += cnt;
389 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
390 tx_ring->data_pending += skb->len;
391 else
392 tx_ring->data_pending = 0;
393
394 if (nfp_nfdk_tx_ring_should_stop(tx_ring))
395 nfp_nfdk_tx_ring_stop(nd_q, tx_ring);
396
397 tx_ring->wr_ptr_add += cnt;
398 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more()))
399 nfp_net_tx_xmit_more_flush(tx_ring);
400
401 return NETDEV_TX_OK;
402
403 err_warn_overflow:
404 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
405 wr_idx, skb_headlen(skb), nr_frags, cnt);
406 if (skb_is_gso(skb))
407 txbuf--;
408 err_unmap:
409 /* txbuf pointed to the next-to-use */
410 etxbuf = txbuf;
411 /* first txbuf holds the skb */
412 txbuf = &tx_ring->ktxbufs[wr_idx + 1];
413 if (txbuf < etxbuf) {
414 dma_unmap_single(dp->dev, txbuf->dma_addr,
415 skb_headlen(skb), DMA_TO_DEVICE);
416 txbuf->raw = 0;
417 txbuf++;
418 }
419 frag = skb_shinfo(skb)->frags;
420 while (etxbuf < txbuf) {
421 dma_unmap_page(dp->dev, txbuf->dma_addr,
422 skb_frag_size(frag), DMA_TO_DEVICE);
423 txbuf->raw = 0;
424 frag++;
425 txbuf++;
426 }
427 err_warn_dma:
428 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
429 err_flush:
430 nfp_net_tx_xmit_more_flush(tx_ring);
431 u64_stats_update_begin(&r_vec->tx_sync);
432 r_vec->tx_errors++;
433 u64_stats_update_end(&r_vec->tx_sync);
434 dev_kfree_skb_any(skb);
435 return NETDEV_TX_OK;
436 }
437
438 /**
439 * nfp_nfdk_tx_complete() - Handled completed TX packets
440 * @tx_ring: TX ring structure
441 * @budget: NAPI budget (only used as bool to determine if in NAPI context)
442 */
nfp_nfdk_tx_complete(struct nfp_net_tx_ring * tx_ring,int budget)443 static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget)
444 {
445 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
446 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
447 u32 done_pkts = 0, done_bytes = 0;
448 struct nfp_nfdk_tx_buf *ktxbufs;
449 struct device *dev = dp->dev;
450 struct netdev_queue *nd_q;
451 u32 rd_p, qcp_rd_p;
452 int todo;
453
454 rd_p = tx_ring->rd_p;
455 if (tx_ring->wr_p == rd_p)
456 return;
457
458 /* Work out how many descriptors have been transmitted */
459 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
460
461 if (qcp_rd_p == tx_ring->qcp_rd_p)
462 return;
463
464 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
465 ktxbufs = tx_ring->ktxbufs;
466
467 while (todo > 0) {
468 const skb_frag_t *frag, *fend;
469 unsigned int size, n_descs = 1;
470 struct nfp_nfdk_tx_buf *txbuf;
471 struct sk_buff *skb;
472
473 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)];
474 skb = txbuf->skb;
475 txbuf++;
476
477 /* Closed block */
478 if (!skb) {
479 n_descs = D_BLOCK_CPL(rd_p);
480 goto next;
481 }
482
483 /* Unmap head */
484 size = skb_headlen(skb);
485 n_descs += nfp_nfdk_headlen_to_segs(size);
486 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);
487 txbuf++;
488
489 /* Unmap frags */
490 frag = skb_shinfo(skb)->frags;
491 fend = frag + skb_shinfo(skb)->nr_frags;
492 for (; frag < fend; frag++) {
493 size = skb_frag_size(frag);
494 n_descs += DIV_ROUND_UP(size,
495 NFDK_TX_MAX_DATA_PER_DESC);
496 dma_unmap_page(dev, txbuf->dma_addr,
497 skb_frag_size(frag), DMA_TO_DEVICE);
498 txbuf++;
499 }
500
501 if (!skb_is_gso(skb)) {
502 done_bytes += skb->len;
503 done_pkts++;
504 } else {
505 done_bytes += txbuf->real_len;
506 done_pkts += txbuf->pkt_cnt;
507 n_descs++;
508 }
509
510 napi_consume_skb(skb, budget);
511 next:
512 rd_p += n_descs;
513 todo -= n_descs;
514 }
515
516 tx_ring->rd_p = rd_p;
517 tx_ring->qcp_rd_p = qcp_rd_p;
518
519 u64_stats_update_begin(&r_vec->tx_sync);
520 r_vec->tx_bytes += done_bytes;
521 r_vec->tx_pkts += done_pkts;
522 u64_stats_update_end(&r_vec->tx_sync);
523
524 if (!dp->netdev)
525 return;
526
527 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
528 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
529 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) {
530 /* Make sure TX thread will see updated tx_ring->rd_p */
531 smp_mb();
532
533 if (unlikely(netif_tx_queue_stopped(nd_q)))
534 netif_tx_wake_queue(nd_q);
535 }
536
537 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
538 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
539 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
540 }
541
542 /* Receive processing */
543 static void *
nfp_nfdk_napi_alloc_one(struct nfp_net_dp * dp,dma_addr_t * dma_addr)544 nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
545 {
546 void *frag;
547
548 if (!dp->xdp_prog) {
549 frag = napi_alloc_frag(dp->fl_bufsz);
550 if (unlikely(!frag))
551 return NULL;
552 } else {
553 struct page *page;
554
555 page = dev_alloc_page();
556 if (unlikely(!page))
557 return NULL;
558 frag = page_address(page);
559 }
560
561 *dma_addr = nfp_net_dma_map_rx(dp, frag);
562 if (dma_mapping_error(dp->dev, *dma_addr)) {
563 nfp_net_free_frag(frag, dp->xdp_prog);
564 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
565 return NULL;
566 }
567
568 return frag;
569 }
570
571 /**
572 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings
573 * @dp: NFP Net data path struct
574 * @rx_ring: RX ring structure
575 * @frag: page fragment buffer
576 * @dma_addr: DMA address of skb mapping
577 */
578 static void
nfp_nfdk_rx_give_one(const struct nfp_net_dp * dp,struct nfp_net_rx_ring * rx_ring,void * frag,dma_addr_t dma_addr)579 nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp,
580 struct nfp_net_rx_ring *rx_ring,
581 void *frag, dma_addr_t dma_addr)
582 {
583 unsigned int wr_idx;
584
585 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
586
587 nfp_net_dma_sync_dev_rx(dp, dma_addr);
588
589 /* Stash SKB and DMA address away */
590 rx_ring->rxbufs[wr_idx].frag = frag;
591 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
592
593 /* Fill freelist descriptor */
594 rx_ring->rxds[wr_idx].fld.reserved = 0;
595 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
596 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld,
597 dma_addr + dp->rx_dma_off);
598
599 rx_ring->wr_p++;
600 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {
601 /* Update write pointer of the freelist queue. Make
602 * sure all writes are flushed before telling the hardware.
603 */
604 wmb();
605 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);
606 }
607 }
608
609 /**
610 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW
611 * @dp: NFP Net data path struct
612 * @rx_ring: RX ring to fill
613 */
nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp * dp,struct nfp_net_rx_ring * rx_ring)614 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp,
615 struct nfp_net_rx_ring *rx_ring)
616 {
617 unsigned int i;
618
619 for (i = 0; i < rx_ring->cnt - 1; i++)
620 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
621 rx_ring->rxbufs[i].dma_addr);
622 }
623
624 /**
625 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors
626 * @flags: RX descriptor flags field in CPU byte order
627 */
nfp_nfdk_rx_csum_has_errors(u16 flags)628 static int nfp_nfdk_rx_csum_has_errors(u16 flags)
629 {
630 u16 csum_all_checked, csum_all_ok;
631
632 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
633 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
634
635 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
636 }
637
638 /**
639 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags
640 * @dp: NFP Net data path struct
641 * @r_vec: per-ring structure
642 * @rxd: Pointer to RX descriptor
643 * @meta: Parsed metadata prepend
644 * @skb: Pointer to SKB
645 */
646 static void
nfp_nfdk_rx_csum(struct nfp_net_dp * dp,struct nfp_net_r_vector * r_vec,struct nfp_net_rx_desc * rxd,struct nfp_meta_parsed * meta,struct sk_buff * skb)647 nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
648 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta,
649 struct sk_buff *skb)
650 {
651 skb_checksum_none_assert(skb);
652
653 if (!(dp->netdev->features & NETIF_F_RXCSUM))
654 return;
655
656 if (meta->csum_type) {
657 skb->ip_summed = meta->csum_type;
658 skb->csum = meta->csum;
659 u64_stats_update_begin(&r_vec->rx_sync);
660 r_vec->hw_csum_rx_complete++;
661 u64_stats_update_end(&r_vec->rx_sync);
662 return;
663 }
664
665 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
666 u64_stats_update_begin(&r_vec->rx_sync);
667 r_vec->hw_csum_rx_error++;
668 u64_stats_update_end(&r_vec->rx_sync);
669 return;
670 }
671
672 /* Assume that the firmware will never report inner CSUM_OK unless outer
673 * L4 headers were successfully parsed. FW will always report zero UDP
674 * checksum as CSUM_OK.
675 */
676 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
677 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
678 __skb_incr_checksum_unnecessary(skb);
679 u64_stats_update_begin(&r_vec->rx_sync);
680 r_vec->hw_csum_rx_ok++;
681 u64_stats_update_end(&r_vec->rx_sync);
682 }
683
684 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
685 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
686 __skb_incr_checksum_unnecessary(skb);
687 u64_stats_update_begin(&r_vec->rx_sync);
688 r_vec->hw_csum_rx_inner_ok++;
689 u64_stats_update_end(&r_vec->rx_sync);
690 }
691 }
692
693 static void
nfp_nfdk_set_hash(struct net_device * netdev,struct nfp_meta_parsed * meta,unsigned int type,__be32 * hash)694 nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,
695 unsigned int type, __be32 *hash)
696 {
697 if (!(netdev->features & NETIF_F_RXHASH))
698 return;
699
700 switch (type) {
701 case NFP_NET_RSS_IPV4:
702 case NFP_NET_RSS_IPV6:
703 case NFP_NET_RSS_IPV6_EX:
704 meta->hash_type = PKT_HASH_TYPE_L3;
705 break;
706 default:
707 meta->hash_type = PKT_HASH_TYPE_L4;
708 break;
709 }
710
711 meta->hash = get_unaligned_be32(hash);
712 }
713
714 static bool
nfp_nfdk_parse_meta(struct net_device * netdev,struct nfp_meta_parsed * meta,void * data,void * pkt,unsigned int pkt_len,int meta_len)715 nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
716 void *data, void *pkt, unsigned int pkt_len, int meta_len)
717 {
718 u32 meta_info, vlan_info;
719
720 meta_info = get_unaligned_be32(data);
721 data += 4;
722
723 while (meta_info) {
724 switch (meta_info & NFP_NET_META_FIELD_MASK) {
725 case NFP_NET_META_HASH:
726 meta_info >>= NFP_NET_META_FIELD_SIZE;
727 nfp_nfdk_set_hash(netdev, meta,
728 meta_info & NFP_NET_META_FIELD_MASK,
729 (__be32 *)data);
730 data += 4;
731 break;
732 case NFP_NET_META_MARK:
733 meta->mark = get_unaligned_be32(data);
734 data += 4;
735 break;
736 case NFP_NET_META_VLAN:
737 vlan_info = get_unaligned_be32(data);
738 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) {
739 meta->vlan.stripped = true;
740 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK,
741 vlan_info);
742 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK,
743 vlan_info);
744 }
745 data += 4;
746 break;
747 case NFP_NET_META_PORTID:
748 meta->portid = get_unaligned_be32(data);
749 data += 4;
750 break;
751 case NFP_NET_META_CSUM:
752 meta->csum_type = CHECKSUM_COMPLETE;
753 meta->csum =
754 (__force __wsum)__get_unaligned_cpu32(data);
755 data += 4;
756 break;
757 case NFP_NET_META_RESYNC_INFO:
758 if (nfp_net_tls_rx_resync_req(netdev, data, pkt,
759 pkt_len))
760 return false;
761 data += sizeof(struct nfp_net_tls_resync_req);
762 break;
763 default:
764 return true;
765 }
766
767 meta_info >>= NFP_NET_META_FIELD_SIZE;
768 }
769
770 return data != pkt;
771 }
772
773 static void
nfp_nfdk_rx_drop(const struct nfp_net_dp * dp,struct nfp_net_r_vector * r_vec,struct nfp_net_rx_ring * rx_ring,struct nfp_net_rx_buf * rxbuf,struct sk_buff * skb)774 nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
775 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
776 struct sk_buff *skb)
777 {
778 u64_stats_update_begin(&r_vec->rx_sync);
779 r_vec->rx_drops++;
780 /* If we have both skb and rxbuf the replacement buffer allocation
781 * must have failed, count this as an alloc failure.
782 */
783 if (skb && rxbuf)
784 r_vec->rx_replace_buf_alloc_fail++;
785 u64_stats_update_end(&r_vec->rx_sync);
786
787 /* skb is build based on the frag, free_skb() would free the frag
788 * so to be able to reuse it we need an extra ref.
789 */
790 if (skb && rxbuf && skb->head == rxbuf->frag)
791 page_ref_inc(virt_to_head_page(rxbuf->frag));
792 if (rxbuf)
793 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
794 if (skb)
795 dev_kfree_skb_any(skb);
796 }
797
nfp_nfdk_xdp_complete(struct nfp_net_tx_ring * tx_ring)798 static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring)
799 {
800 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
801 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
802 struct nfp_net_rx_ring *rx_ring;
803 u32 qcp_rd_p, done = 0;
804 bool done_all;
805 int todo;
806
807 /* Work out how many descriptors have been transmitted */
808 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
809 if (qcp_rd_p == tx_ring->qcp_rd_p)
810 return true;
811
812 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
813
814 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
815 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
816
817 rx_ring = r_vec->rx_ring;
818 while (todo > 0) {
819 int idx = D_IDX(tx_ring, tx_ring->rd_p + done);
820 struct nfp_nfdk_tx_buf *txbuf;
821 unsigned int step = 1;
822
823 txbuf = &tx_ring->ktxbufs[idx];
824 if (!txbuf->raw)
825 goto next;
826
827 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) {
828 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n");
829 goto next;
830 }
831
832 /* Two successive txbufs are used to stash virtual and dma
833 * address respectively, recycle and clean them here.
834 */
835 nfp_nfdk_rx_give_one(dp, rx_ring,
836 (void *)NFDK_TX_BUF_PTR(txbuf[0].val),
837 txbuf[1].dma_addr);
838 txbuf[0].raw = 0;
839 txbuf[1].raw = 0;
840 step = 2;
841
842 u64_stats_update_begin(&r_vec->tx_sync);
843 /* Note: tx_bytes not accumulated. */
844 r_vec->tx_pkts++;
845 u64_stats_update_end(&r_vec->tx_sync);
846 next:
847 todo -= step;
848 done += step;
849 }
850
851 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done);
852 tx_ring->rd_p += done;
853
854 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
855 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
856 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
857
858 return done_all;
859 }
860
861 static bool
nfp_nfdk_tx_xdp_buf(struct nfp_net_dp * dp,struct nfp_net_rx_ring * rx_ring,struct nfp_net_tx_ring * tx_ring,struct nfp_net_rx_buf * rxbuf,unsigned int dma_off,unsigned int pkt_len,bool * completed)862 nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
863 struct nfp_net_tx_ring *tx_ring,
864 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
865 unsigned int pkt_len, bool *completed)
866 {
867 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA;
868 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen;
869 struct nfp_nfdk_tx_buf *txbuf;
870 struct nfp_nfdk_tx_desc *txd;
871 unsigned int n_descs;
872 dma_addr_t dma_addr;
873 int wr_idx;
874
875 /* Reject if xdp_adjust_tail grow packet beyond DMA area */
876 if (pkt_len + dma_off > dma_map_sz)
877 return false;
878
879 /* Make sure there's still at least one block available after
880 * aligning to block boundary, so that the txds used below
881 * won't wrap around the tx_ring.
882 */
883 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
884 if (!*completed) {
885 nfp_nfdk_xdp_complete(tx_ring);
886 *completed = true;
887 }
888
889 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
890 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
891 NULL);
892 return false;
893 }
894 }
895
896 /* Check if cross block boundary */
897 n_descs = nfp_nfdk_headlen_to_segs(pkt_len);
898 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
899 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) ||
900 ((u32)tx_ring->data_pending + pkt_len >
901 NFDK_TX_MAX_DATA_PER_BLOCK)) {
902 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p);
903
904 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
905 txd = &tx_ring->ktxds[wr_idx];
906 memset(txd, 0,
907 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
908
909 tx_ring->data_pending = 0;
910 tx_ring->wr_p += nop_slots;
911 tx_ring->wr_ptr_add += nop_slots;
912 }
913
914 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
915
916 txbuf = &tx_ring->ktxbufs[wr_idx];
917
918 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP;
919 txbuf[1].dma_addr = rxbuf->dma_addr;
920 /* Note: pkt len not stored */
921
922 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
923 pkt_len, DMA_BIDIRECTIONAL);
924
925 /* Build TX descriptor */
926 txd = &tx_ring->ktxds[wr_idx];
927 dma_len = pkt_len;
928 dma_addr = rxbuf->dma_addr + dma_off;
929
930 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
931 type = NFDK_DESC_TX_TYPE_SIMPLE;
932 else
933 type = NFDK_DESC_TX_TYPE_GATHER;
934
935 /* FIELD_PREP() implicitly truncates to chunk */
936 dma_len -= 1;
937 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
938 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
939 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
940 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
941
942 txd->dma_len_type = cpu_to_le16(dlen_type);
943 nfp_desc_set_dma_addr_48b(txd, dma_addr);
944
945 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
946 dma_len -= tmp_dlen;
947 dma_addr += tmp_dlen + 1;
948 txd++;
949
950 while (dma_len > 0) {
951 dma_len -= 1;
952 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
953 txd->dma_len_type = cpu_to_le16(dlen_type);
954 nfp_desc_set_dma_addr_48b(txd, dma_addr);
955
956 dlen_type &= NFDK_DESC_TX_DMA_LEN;
957 dma_len -= dlen_type;
958 dma_addr += dlen_type + 1;
959 txd++;
960 }
961
962 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
963
964 /* Metadata desc */
965 txd->raw = 0;
966 txd++;
967
968 cnt = txd - tx_ring->ktxds - wr_idx;
969 tx_ring->wr_p += cnt;
970 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
971 tx_ring->data_pending += pkt_len;
972 else
973 tx_ring->data_pending = 0;
974
975 tx_ring->wr_ptr_add += cnt;
976 return true;
977 }
978
979 /**
980 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring
981 * @rx_ring: RX ring to receive from
982 * @budget: NAPI budget
983 *
984 * Note, this function is separated out from the napi poll function to
985 * more cleanly separate packet receive code from other bookkeeping
986 * functions performed in the napi poll function.
987 *
988 * Return: Number of packets received.
989 */
nfp_nfdk_rx(struct nfp_net_rx_ring * rx_ring,int budget)990 static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget)
991 {
992 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
993 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
994 struct nfp_net_tx_ring *tx_ring;
995 struct bpf_prog *xdp_prog;
996 bool xdp_tx_cmpl = false;
997 unsigned int true_bufsz;
998 struct sk_buff *skb;
999 int pkts_polled = 0;
1000 struct xdp_buff xdp;
1001 int idx;
1002
1003 xdp_prog = READ_ONCE(dp->xdp_prog);
1004 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
1005 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM,
1006 &rx_ring->xdp_rxq);
1007 tx_ring = r_vec->xdp_ring;
1008
1009 while (pkts_polled < budget) {
1010 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1011 struct nfp_net_rx_buf *rxbuf;
1012 struct nfp_net_rx_desc *rxd;
1013 struct nfp_meta_parsed meta;
1014 bool redir_egress = false;
1015 struct net_device *netdev;
1016 dma_addr_t new_dma_addr;
1017 u32 meta_len_xdp = 0;
1018 void *new_frag;
1019
1020 idx = D_IDX(rx_ring, rx_ring->rd_p);
1021
1022 rxd = &rx_ring->rxds[idx];
1023 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1024 break;
1025
1026 /* Memory barrier to ensure that we won't do other reads
1027 * before the DD bit.
1028 */
1029 dma_rmb();
1030
1031 memset(&meta, 0, sizeof(meta));
1032
1033 rx_ring->rd_p++;
1034 pkts_polled++;
1035
1036 rxbuf = &rx_ring->rxbufs[idx];
1037 /* < meta_len >
1038 * <-- [rx_offset] -->
1039 * ---------------------------------------------------------
1040 * | [XX] | metadata | packet | XXXX |
1041 * ---------------------------------------------------------
1042 * <---------------- data_len --------------->
1043 *
1044 * The rx_offset is fixed for all packets, the meta_len can vary
1045 * on a packet by packet basis. If rx_offset is set to zero
1046 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
1047 * buffer and is immediately followed by the packet (no [XX]).
1048 */
1049 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1050 data_len = le16_to_cpu(rxd->rxd.data_len);
1051 pkt_len = data_len - meta_len;
1052
1053 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1054 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1055 pkt_off += meta_len;
1056 else
1057 pkt_off += dp->rx_offset;
1058 meta_off = pkt_off - meta_len;
1059
1060 /* Stats update */
1061 u64_stats_update_begin(&r_vec->rx_sync);
1062 r_vec->rx_pkts++;
1063 r_vec->rx_bytes += pkt_len;
1064 u64_stats_update_end(&r_vec->rx_sync);
1065
1066 if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
1067 (dp->rx_offset && meta_len > dp->rx_offset))) {
1068 nn_dp_warn(dp, "oversized RX packet metadata %u\n",
1069 meta_len);
1070 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1071 continue;
1072 }
1073
1074 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,
1075 data_len);
1076
1077 if (meta_len) {
1078 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta,
1079 rxbuf->frag + meta_off,
1080 rxbuf->frag + pkt_off,
1081 pkt_len, meta_len))) {
1082 nn_dp_warn(dp, "invalid RX packet metadata\n");
1083 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1084 NULL);
1085 continue;
1086 }
1087 }
1088
1089 if (xdp_prog && !meta.portid) {
1090 void *orig_data = rxbuf->frag + pkt_off;
1091 unsigned int dma_off;
1092 int act;
1093
1094 xdp_prepare_buff(&xdp,
1095 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM,
1096 pkt_off - NFP_NET_RX_BUF_HEADROOM,
1097 pkt_len, true);
1098
1099 act = bpf_prog_run_xdp(xdp_prog, &xdp);
1100
1101 pkt_len = xdp.data_end - xdp.data;
1102 pkt_off += xdp.data - orig_data;
1103
1104 switch (act) {
1105 case XDP_PASS:
1106 meta_len_xdp = xdp.data - xdp.data_meta;
1107 break;
1108 case XDP_TX:
1109 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
1110 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring,
1111 tx_ring,
1112 rxbuf,
1113 dma_off,
1114 pkt_len,
1115 &xdp_tx_cmpl)))
1116 trace_xdp_exception(dp->netdev,
1117 xdp_prog, act);
1118 continue;
1119 default:
1120 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act);
1121 fallthrough;
1122 case XDP_ABORTED:
1123 trace_xdp_exception(dp->netdev, xdp_prog, act);
1124 fallthrough;
1125 case XDP_DROP:
1126 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1127 rxbuf->dma_addr);
1128 continue;
1129 }
1130 }
1131
1132 if (likely(!meta.portid)) {
1133 netdev = dp->netdev;
1134 } else if (meta.portid == NFP_META_PORT_ID_CTRL) {
1135 struct nfp_net *nn = netdev_priv(dp->netdev);
1136
1137 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off,
1138 pkt_len);
1139 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1140 rxbuf->dma_addr);
1141 continue;
1142 } else {
1143 struct nfp_net *nn;
1144
1145 nn = netdev_priv(dp->netdev);
1146 netdev = nfp_app_dev_get(nn->app, meta.portid,
1147 &redir_egress);
1148 if (unlikely(!netdev)) {
1149 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1150 NULL);
1151 continue;
1152 }
1153
1154 if (nfp_netdev_is_nfp_repr(netdev))
1155 nfp_repr_inc_rx_stats(netdev, pkt_len);
1156 }
1157
1158 skb = build_skb(rxbuf->frag, true_bufsz);
1159 if (unlikely(!skb)) {
1160 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1161 continue;
1162 }
1163 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1164 if (unlikely(!new_frag)) {
1165 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1166 continue;
1167 }
1168
1169 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1170
1171 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1172
1173 skb_reserve(skb, pkt_off);
1174 skb_put(skb, pkt_len);
1175
1176 skb->mark = meta.mark;
1177 skb_set_hash(skb, meta.hash, meta.hash_type);
1178
1179 skb_record_rx_queue(skb, rx_ring->idx);
1180 skb->protocol = eth_type_trans(skb, netdev);
1181
1182 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb);
1183
1184 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) {
1185 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
1186 continue;
1187 }
1188
1189 if (meta_len_xdp)
1190 skb_metadata_set(skb, meta_len_xdp);
1191
1192 if (likely(!redir_egress)) {
1193 napi_gro_receive(&rx_ring->r_vec->napi, skb);
1194 } else {
1195 skb->dev = netdev;
1196 skb_reset_network_header(skb);
1197 __skb_push(skb, ETH_HLEN);
1198 dev_queue_xmit(skb);
1199 }
1200 }
1201
1202 if (xdp_prog) {
1203 if (tx_ring->wr_ptr_add)
1204 nfp_net_tx_xmit_more_flush(tx_ring);
1205 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&
1206 !xdp_tx_cmpl)
1207 if (!nfp_nfdk_xdp_complete(tx_ring))
1208 pkts_polled = budget;
1209 }
1210
1211 return pkts_polled;
1212 }
1213
1214 /**
1215 * nfp_nfdk_poll() - napi poll function
1216 * @napi: NAPI structure
1217 * @budget: NAPI budget
1218 *
1219 * Return: number of packets polled.
1220 */
nfp_nfdk_poll(struct napi_struct * napi,int budget)1221 int nfp_nfdk_poll(struct napi_struct *napi, int budget)
1222 {
1223 struct nfp_net_r_vector *r_vec =
1224 container_of(napi, struct nfp_net_r_vector, napi);
1225 unsigned int pkts_polled = 0;
1226
1227 if (r_vec->tx_ring)
1228 nfp_nfdk_tx_complete(r_vec->tx_ring, budget);
1229 if (r_vec->rx_ring)
1230 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget);
1231
1232 if (pkts_polled < budget)
1233 if (napi_complete_done(napi, pkts_polled))
1234 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1235
1236 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) {
1237 struct dim_sample dim_sample = {};
1238 unsigned int start;
1239 u64 pkts, bytes;
1240
1241 do {
1242 start = u64_stats_fetch_begin(&r_vec->rx_sync);
1243 pkts = r_vec->rx_pkts;
1244 bytes = r_vec->rx_bytes;
1245 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
1246
1247 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1248 net_dim(&r_vec->rx_dim, dim_sample);
1249 }
1250
1251 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
1252 struct dim_sample dim_sample = {};
1253 unsigned int start;
1254 u64 pkts, bytes;
1255
1256 do {
1257 start = u64_stats_fetch_begin(&r_vec->tx_sync);
1258 pkts = r_vec->tx_pkts;
1259 bytes = r_vec->tx_bytes;
1260 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
1261
1262 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1263 net_dim(&r_vec->tx_dim, dim_sample);
1264 }
1265
1266 return pkts_polled;
1267 }
1268
1269 /* Control device data path
1270 */
1271
1272 bool
nfp_nfdk_ctrl_tx_one(struct nfp_net * nn,struct nfp_net_r_vector * r_vec,struct sk_buff * skb,bool old)1273 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
1274 struct sk_buff *skb, bool old)
1275 {
1276 u32 cnt, tmp_dlen, dlen_type = 0;
1277 struct nfp_net_tx_ring *tx_ring;
1278 struct nfp_nfdk_tx_buf *txbuf;
1279 struct nfp_nfdk_tx_desc *txd;
1280 unsigned int dma_len, type;
1281 struct nfp_net_dp *dp;
1282 dma_addr_t dma_addr;
1283 u64 metadata = 0;
1284 int wr_idx;
1285
1286 dp = &r_vec->nfp_net->dp;
1287 tx_ring = r_vec->tx_ring;
1288
1289 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {
1290 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");
1291 goto err_free;
1292 }
1293
1294 /* Don't bother counting frags, assume the worst */
1295 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
1296 u64_stats_update_begin(&r_vec->tx_sync);
1297 r_vec->tx_busy++;
1298 u64_stats_update_end(&r_vec->tx_sync);
1299 if (!old)
1300 __skb_queue_tail(&r_vec->queue, skb);
1301 else
1302 __skb_queue_head(&r_vec->queue, skb);
1303 return NETDEV_TX_BUSY;
1304 }
1305
1306 if (nfp_app_ctrl_has_meta(nn->app)) {
1307 if (unlikely(skb_headroom(skb) < 8)) {
1308 nn_dp_warn(dp, "CTRL TX on skb without headroom\n");
1309 goto err_free;
1310 }
1311 metadata = NFDK_DESC_TX_CHAIN_META;
1312 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
1313 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) |
1314 FIELD_PREP(NFDK_META_FIELDS,
1315 NFP_NET_META_PORTID),
1316 skb_push(skb, 4));
1317 }
1318
1319 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
1320 goto err_free;
1321
1322 /* DMA map all */
1323 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
1324 txd = &tx_ring->ktxds[wr_idx];
1325 txbuf = &tx_ring->ktxbufs[wr_idx];
1326
1327 dma_len = skb_headlen(skb);
1328 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
1329 type = NFDK_DESC_TX_TYPE_SIMPLE;
1330 else
1331 type = NFDK_DESC_TX_TYPE_GATHER;
1332
1333 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
1334 if (dma_mapping_error(dp->dev, dma_addr))
1335 goto err_warn_dma;
1336
1337 txbuf->skb = skb;
1338 txbuf++;
1339
1340 txbuf->dma_addr = dma_addr;
1341 txbuf++;
1342
1343 dma_len -= 1;
1344 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
1345 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
1346 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
1347 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
1348
1349 txd->dma_len_type = cpu_to_le16(dlen_type);
1350 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1351
1352 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
1353 dma_len -= tmp_dlen;
1354 dma_addr += tmp_dlen + 1;
1355 txd++;
1356
1357 while (dma_len > 0) {
1358 dma_len -= 1;
1359 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
1360 txd->dma_len_type = cpu_to_le16(dlen_type);
1361 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1362
1363 dlen_type &= NFDK_DESC_TX_DMA_LEN;
1364 dma_len -= dlen_type;
1365 dma_addr += dlen_type + 1;
1366 txd++;
1367 }
1368
1369 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
1370
1371 /* Metadata desc */
1372 txd->raw = cpu_to_le64(metadata);
1373 txd++;
1374
1375 cnt = txd - tx_ring->ktxds - wr_idx;
1376 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
1377 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
1378 goto err_warn_overflow;
1379
1380 tx_ring->wr_p += cnt;
1381 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
1382 tx_ring->data_pending += skb->len;
1383 else
1384 tx_ring->data_pending = 0;
1385
1386 tx_ring->wr_ptr_add += cnt;
1387 nfp_net_tx_xmit_more_flush(tx_ring);
1388
1389 return NETDEV_TX_OK;
1390
1391 err_warn_overflow:
1392 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
1393 wr_idx, skb_headlen(skb), 0, cnt);
1394 txbuf--;
1395 dma_unmap_single(dp->dev, txbuf->dma_addr,
1396 skb_headlen(skb), DMA_TO_DEVICE);
1397 txbuf->raw = 0;
1398 err_warn_dma:
1399 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
1400 err_free:
1401 u64_stats_update_begin(&r_vec->tx_sync);
1402 r_vec->tx_errors++;
1403 u64_stats_update_end(&r_vec->tx_sync);
1404 dev_kfree_skb_any(skb);
1405 return NETDEV_TX_OK;
1406 }
1407
__nfp_ctrl_tx_queued(struct nfp_net_r_vector * r_vec)1408 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)
1409 {
1410 struct sk_buff *skb;
1411
1412 while ((skb = __skb_dequeue(&r_vec->queue)))
1413 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))
1414 return;
1415 }
1416
1417 static bool
nfp_ctrl_meta_ok(struct nfp_net * nn,void * data,unsigned int meta_len)1418 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)
1419 {
1420 u32 meta_type, meta_tag;
1421
1422 if (!nfp_app_ctrl_has_meta(nn->app))
1423 return !meta_len;
1424
1425 if (meta_len != 8)
1426 return false;
1427
1428 meta_type = get_unaligned_be32(data);
1429 meta_tag = get_unaligned_be32(data + 4);
1430
1431 return (meta_type == NFP_NET_META_PORTID &&
1432 meta_tag == NFP_META_PORT_ID_CTRL);
1433 }
1434
1435 static bool
nfp_ctrl_rx_one(struct nfp_net * nn,struct nfp_net_dp * dp,struct nfp_net_r_vector * r_vec,struct nfp_net_rx_ring * rx_ring)1436 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,
1437 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)
1438 {
1439 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1440 struct nfp_net_rx_buf *rxbuf;
1441 struct nfp_net_rx_desc *rxd;
1442 dma_addr_t new_dma_addr;
1443 struct sk_buff *skb;
1444 void *new_frag;
1445 int idx;
1446
1447 idx = D_IDX(rx_ring, rx_ring->rd_p);
1448
1449 rxd = &rx_ring->rxds[idx];
1450 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1451 return false;
1452
1453 /* Memory barrier to ensure that we won't do other reads
1454 * before the DD bit.
1455 */
1456 dma_rmb();
1457
1458 rx_ring->rd_p++;
1459
1460 rxbuf = &rx_ring->rxbufs[idx];
1461 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1462 data_len = le16_to_cpu(rxd->rxd.data_len);
1463 pkt_len = data_len - meta_len;
1464
1465 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1466 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1467 pkt_off += meta_len;
1468 else
1469 pkt_off += dp->rx_offset;
1470 meta_off = pkt_off - meta_len;
1471
1472 /* Stats update */
1473 u64_stats_update_begin(&r_vec->rx_sync);
1474 r_vec->rx_pkts++;
1475 r_vec->rx_bytes += pkt_len;
1476 u64_stats_update_end(&r_vec->rx_sync);
1477
1478 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);
1479
1480 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {
1481 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",
1482 meta_len);
1483 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1484 return true;
1485 }
1486
1487 skb = build_skb(rxbuf->frag, dp->fl_bufsz);
1488 if (unlikely(!skb)) {
1489 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1490 return true;
1491 }
1492 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1493 if (unlikely(!new_frag)) {
1494 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1495 return true;
1496 }
1497
1498 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1499
1500 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1501
1502 skb_reserve(skb, pkt_off);
1503 skb_put(skb, pkt_len);
1504
1505 nfp_app_ctrl_rx(nn->app, skb);
1506
1507 return true;
1508 }
1509
nfp_ctrl_rx(struct nfp_net_r_vector * r_vec)1510 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)
1511 {
1512 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;
1513 struct nfp_net *nn = r_vec->nfp_net;
1514 struct nfp_net_dp *dp = &nn->dp;
1515 unsigned int budget = 512;
1516
1517 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--)
1518 continue;
1519
1520 return budget;
1521 }
1522
nfp_nfdk_ctrl_poll(struct tasklet_struct * t)1523 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t)
1524 {
1525 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet);
1526
1527 spin_lock(&r_vec->lock);
1528 nfp_nfdk_tx_complete(r_vec->tx_ring, 0);
1529 __nfp_ctrl_tx_queued(r_vec);
1530 spin_unlock(&r_vec->lock);
1531
1532 if (nfp_ctrl_rx(r_vec)) {
1533 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1534 } else {
1535 tasklet_schedule(&r_vec->tasklet);
1536 nn_dp_warn(&r_vec->nfp_net->dp,
1537 "control message budget exceeded!\n");
1538 }
1539 }
1540