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 #include <net/xfrm.h>
10
11 #include "../nfp_app.h"
12 #include "../nfp_net.h"
13 #include "../nfp_net_dp.h"
14 #include "../crypto/crypto.h"
15 #include "../crypto/fw.h"
16 #include "nfdk.h"
17
nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring * tx_ring)18 static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
19 {
20 return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2);
21 }
22
nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring * tx_ring)23 static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
24 {
25 return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT);
26 }
27
nfp_nfdk_tx_ring_stop(struct netdev_queue * nd_q,struct nfp_net_tx_ring * tx_ring)28 static void nfp_nfdk_tx_ring_stop(struct netdev_queue *nd_q,
29 struct nfp_net_tx_ring *tx_ring)
30 {
31 netif_tx_stop_queue(nd_q);
32
33 /* We can race with the TX completion out of NAPI so recheck */
34 smp_mb();
35 if (unlikely(nfp_nfdk_tx_ring_should_wake(tx_ring)))
36 netif_tx_start_queue(nd_q);
37 }
38
39 static __le64
nfp_nfdk_tx_tso(struct nfp_net_r_vector * r_vec,struct nfp_nfdk_tx_buf * txbuf,struct sk_buff * skb)40 nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf,
41 struct sk_buff *skb)
42 {
43 u32 segs, hdrlen, l3_offset, l4_offset;
44 struct nfp_nfdk_tx_desc txd;
45 u16 mss;
46
47 if (!skb->encapsulation) {
48 l3_offset = skb_network_offset(skb);
49 l4_offset = skb_transport_offset(skb);
50 hdrlen = skb_tcp_all_headers(skb);
51 } else {
52 l3_offset = skb_inner_network_offset(skb);
53 l4_offset = skb_inner_transport_offset(skb);
54 hdrlen = skb_inner_tcp_all_headers(skb);
55 }
56
57 segs = skb_shinfo(skb)->gso_segs;
58 mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK;
59
60 txd.l3_offset = l3_offset;
61 txd.l4_offset = l4_offset;
62 txd.lso_meta_res = 0;
63 txd.mss = cpu_to_le16(mss);
64 txd.lso_hdrlen = hdrlen;
65 txd.lso_totsegs = segs;
66
67 txbuf->pkt_cnt = segs;
68 txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1);
69
70 u64_stats_update_begin(&r_vec->tx_sync);
71 r_vec->tx_lso++;
72 u64_stats_update_end(&r_vec->tx_sync);
73
74 return txd.raw;
75 }
76
77 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)78 nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
79 unsigned int pkt_cnt, struct sk_buff *skb, u64 flags)
80 {
81 struct ipv6hdr *ipv6h;
82 struct iphdr *iph;
83
84 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
85 return flags;
86
87 if (skb->ip_summed != CHECKSUM_PARTIAL)
88 return flags;
89
90 flags |= NFDK_DESC_TX_L4_CSUM;
91
92 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
93 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
94
95 /* L3 checksum offloading flag is not required for ipv6 */
96 if (iph->version == 4) {
97 flags |= NFDK_DESC_TX_L3_CSUM;
98 } else if (ipv6h->version != 6) {
99 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
100 return flags;
101 }
102
103 u64_stats_update_begin(&r_vec->tx_sync);
104 if (!skb->encapsulation) {
105 r_vec->hw_csum_tx += pkt_cnt;
106 } else {
107 flags |= NFDK_DESC_TX_ENCAP;
108 r_vec->hw_csum_tx_inner += pkt_cnt;
109 }
110 u64_stats_update_end(&r_vec->tx_sync);
111
112 return flags;
113 }
114
115 static int
nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring * tx_ring,struct sk_buff * skb)116 nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring,
117 struct sk_buff *skb)
118 {
119 unsigned int n_descs, wr_p, nop_slots;
120 const skb_frag_t *frag, *fend;
121 struct nfp_nfdk_tx_desc *txd;
122 unsigned int nr_frags;
123 unsigned int wr_idx;
124 int err;
125
126 recount_descs:
127 n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb));
128 nr_frags = skb_shinfo(skb)->nr_frags;
129 frag = skb_shinfo(skb)->frags;
130 fend = frag + nr_frags;
131 for (; frag < fend; frag++)
132 n_descs += DIV_ROUND_UP(skb_frag_size(frag),
133 NFDK_TX_MAX_DATA_PER_DESC);
134
135 if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) {
136 if (skb_is_nonlinear(skb)) {
137 err = skb_linearize(skb);
138 if (err)
139 return err;
140 goto recount_descs;
141 }
142 return -EINVAL;
143 }
144
145 /* Under count by 1 (don't count meta) for the round down to work out */
146 n_descs += !!skb_is_gso(skb);
147
148 if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
149 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT))
150 goto close_block;
151
152 if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK)
153 goto close_block;
154
155 return 0;
156
157 close_block:
158 wr_p = tx_ring->wr_p;
159 nop_slots = D_BLOCK_CPL(wr_p);
160
161 wr_idx = D_IDX(tx_ring, wr_p);
162 tx_ring->ktxbufs[wr_idx].skb = NULL;
163 txd = &tx_ring->ktxds[wr_idx];
164
165 memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
166
167 tx_ring->data_pending = 0;
168 tx_ring->wr_p += nop_slots;
169 tx_ring->wr_ptr_add += nop_slots;
170
171 return 0;
172 }
173
174 static int
nfp_nfdk_prep_tx_meta(struct nfp_net_dp * dp,struct nfp_app * app,struct sk_buff * skb,bool * ipsec)175 nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app,
176 struct sk_buff *skb, bool *ipsec)
177 {
178 struct metadata_dst *md_dst = skb_metadata_dst(skb);
179 struct nfp_ipsec_offload offload_info;
180 unsigned char *data;
181 bool vlan_insert;
182 u32 meta_id = 0;
183 int md_bytes;
184
185 #ifdef CONFIG_NFP_NET_IPSEC
186 if (xfrm_offload(skb))
187 *ipsec = nfp_net_ipsec_tx_prep(dp, skb, &offload_info);
188 #endif
189
190 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX))
191 md_dst = NULL;
192
193 vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2);
194
195 if (!(md_dst || vlan_insert || *ipsec))
196 return 0;
197
198 md_bytes = sizeof(meta_id) +
199 (!!md_dst ? NFP_NET_META_PORTID_SIZE : 0) +
200 (vlan_insert ? NFP_NET_META_VLAN_SIZE : 0) +
201 (*ipsec ? NFP_NET_META_IPSEC_FIELD_SIZE : 0);
202
203 if (unlikely(skb_cow_head(skb, md_bytes)))
204 return -ENOMEM;
205
206 data = skb_push(skb, md_bytes) + md_bytes;
207 if (md_dst) {
208 data -= NFP_NET_META_PORTID_SIZE;
209 put_unaligned_be32(md_dst->u.port_info.port_id, data);
210 meta_id = NFP_NET_META_PORTID;
211 }
212 if (vlan_insert) {
213 data -= NFP_NET_META_VLAN_SIZE;
214 /* data type of skb->vlan_proto is __be16
215 * so it fills metadata without calling put_unaligned_be16
216 */
217 memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto));
218 put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto));
219 meta_id <<= NFP_NET_META_FIELD_SIZE;
220 meta_id |= NFP_NET_META_VLAN;
221 }
222
223 if (*ipsec) {
224 data -= NFP_NET_META_IPSEC_SIZE;
225 put_unaligned_be32(offload_info.seq_hi, data);
226 data -= NFP_NET_META_IPSEC_SIZE;
227 put_unaligned_be32(offload_info.seq_low, data);
228 data -= NFP_NET_META_IPSEC_SIZE;
229 put_unaligned_be32(offload_info.handle - 1, data);
230 meta_id <<= NFP_NET_META_IPSEC_FIELD_SIZE;
231 meta_id |= NFP_NET_META_IPSEC << 8 | NFP_NET_META_IPSEC << 4 | NFP_NET_META_IPSEC;
232 }
233
234 meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) |
235 FIELD_PREP(NFDK_META_FIELDS, meta_id);
236
237 data -= sizeof(meta_id);
238 put_unaligned_be32(meta_id, data);
239
240 return NFDK_DESC_TX_CHAIN_META;
241 }
242
243 /**
244 * nfp_nfdk_tx() - Main transmit entry point
245 * @skb: SKB to transmit
246 * @netdev: netdev structure
247 *
248 * Return: NETDEV_TX_OK on success.
249 */
nfp_nfdk_tx(struct sk_buff * skb,struct net_device * netdev)250 netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
251 {
252 struct nfp_net *nn = netdev_priv(netdev);
253 struct nfp_nfdk_tx_buf *txbuf, *etxbuf;
254 u32 cnt, tmp_dlen, dlen_type = 0;
255 struct nfp_net_tx_ring *tx_ring;
256 struct nfp_net_r_vector *r_vec;
257 const skb_frag_t *frag, *fend;
258 struct nfp_nfdk_tx_desc *txd;
259 unsigned int real_len, qidx;
260 unsigned int dma_len, type;
261 struct netdev_queue *nd_q;
262 struct nfp_net_dp *dp;
263 int nr_frags, wr_idx;
264 dma_addr_t dma_addr;
265 bool ipsec = false;
266 u64 metadata;
267
268 dp = &nn->dp;
269 qidx = skb_get_queue_mapping(skb);
270 tx_ring = &dp->tx_rings[qidx];
271 r_vec = tx_ring->r_vec;
272 nd_q = netdev_get_tx_queue(dp->netdev, qidx);
273
274 /* Don't bother counting frags, assume the worst */
275 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
276 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",
277 qidx, tx_ring->wr_p, tx_ring->rd_p);
278 netif_tx_stop_queue(nd_q);
279 nfp_net_tx_xmit_more_flush(tx_ring);
280 u64_stats_update_begin(&r_vec->tx_sync);
281 r_vec->tx_busy++;
282 u64_stats_update_end(&r_vec->tx_sync);
283 return NETDEV_TX_BUSY;
284 }
285
286 metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb, &ipsec);
287 if (unlikely((int)metadata < 0))
288 goto err_flush;
289
290 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
291 goto err_flush;
292
293 /* nr_frags will change after skb_linearize so we get nr_frags after
294 * nfp_nfdk_tx_maybe_close_block function
295 */
296 nr_frags = skb_shinfo(skb)->nr_frags;
297 /* DMA map all */
298 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
299 txd = &tx_ring->ktxds[wr_idx];
300 txbuf = &tx_ring->ktxbufs[wr_idx];
301
302 dma_len = skb_headlen(skb);
303 if (skb_is_gso(skb))
304 type = NFDK_DESC_TX_TYPE_TSO;
305 else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
306 type = NFDK_DESC_TX_TYPE_SIMPLE;
307 else
308 type = NFDK_DESC_TX_TYPE_GATHER;
309
310 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
311 if (dma_mapping_error(dp->dev, dma_addr))
312 goto err_warn_dma;
313
314 txbuf->skb = skb;
315 txbuf++;
316
317 txbuf->dma_addr = dma_addr;
318 txbuf++;
319
320 /* FIELD_PREP() implicitly truncates to chunk */
321 dma_len -= 1;
322
323 /* We will do our best to pass as much data as we can in descriptor
324 * and we need to make sure the first descriptor includes whole head
325 * since there is limitation in firmware side. Sometimes the value of
326 * dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than
327 * headlen.
328 */
329 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
330 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
331 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
332 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
333
334 txd->dma_len_type = cpu_to_le16(dlen_type);
335 nfp_desc_set_dma_addr_48b(txd, dma_addr);
336
337 /* starts at bit 0 */
338 BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1));
339
340 /* Preserve the original dlen_type, this way below the EOP logic
341 * can use dlen_type.
342 */
343 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
344 dma_len -= tmp_dlen;
345 dma_addr += tmp_dlen + 1;
346 txd++;
347
348 /* The rest of the data (if any) will be in larger dma descritors
349 * and is handled with the fragment loop.
350 */
351 frag = skb_shinfo(skb)->frags;
352 fend = frag + nr_frags;
353
354 while (true) {
355 while (dma_len > 0) {
356 dma_len -= 1;
357 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
358
359 txd->dma_len_type = cpu_to_le16(dlen_type);
360 nfp_desc_set_dma_addr_48b(txd, dma_addr);
361
362 dma_len -= dlen_type;
363 dma_addr += dlen_type + 1;
364 txd++;
365 }
366
367 if (frag >= fend)
368 break;
369
370 dma_len = skb_frag_size(frag);
371 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len,
372 DMA_TO_DEVICE);
373 if (dma_mapping_error(dp->dev, dma_addr))
374 goto err_unmap;
375
376 txbuf->dma_addr = dma_addr;
377 txbuf++;
378
379 frag++;
380 }
381
382 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
383
384 if (ipsec)
385 metadata = nfp_nfdk_ipsec_tx(metadata, skb);
386
387 if (!skb_is_gso(skb)) {
388 real_len = skb->len;
389 /* Metadata desc */
390 if (!ipsec)
391 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
392 txd->raw = cpu_to_le64(metadata);
393 txd++;
394 } else {
395 /* lso desc should be placed after metadata desc */
396 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);
397 real_len = txbuf->real_len;
398 /* Metadata desc */
399 if (!ipsec)
400 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
401 txd->raw = cpu_to_le64(metadata);
402 txd += 2;
403 txbuf++;
404 }
405
406 cnt = txd - tx_ring->ktxds - wr_idx;
407 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
408 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
409 goto err_warn_overflow;
410
411 skb_tx_timestamp(skb);
412
413 tx_ring->wr_p += cnt;
414 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
415 tx_ring->data_pending += skb->len;
416 else
417 tx_ring->data_pending = 0;
418
419 if (nfp_nfdk_tx_ring_should_stop(tx_ring))
420 nfp_nfdk_tx_ring_stop(nd_q, tx_ring);
421
422 tx_ring->wr_ptr_add += cnt;
423 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more()))
424 nfp_net_tx_xmit_more_flush(tx_ring);
425
426 return NETDEV_TX_OK;
427
428 err_warn_overflow:
429 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
430 wr_idx, skb_headlen(skb), nr_frags, cnt);
431 if (skb_is_gso(skb))
432 txbuf--;
433 err_unmap:
434 /* txbuf pointed to the next-to-use */
435 etxbuf = txbuf;
436 /* first txbuf holds the skb */
437 txbuf = &tx_ring->ktxbufs[wr_idx + 1];
438 if (txbuf < etxbuf) {
439 dma_unmap_single(dp->dev, txbuf->dma_addr,
440 skb_headlen(skb), DMA_TO_DEVICE);
441 txbuf->raw = 0;
442 txbuf++;
443 }
444 frag = skb_shinfo(skb)->frags;
445 while (etxbuf < txbuf) {
446 dma_unmap_page(dp->dev, txbuf->dma_addr,
447 skb_frag_size(frag), DMA_TO_DEVICE);
448 txbuf->raw = 0;
449 frag++;
450 txbuf++;
451 }
452 err_warn_dma:
453 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
454 err_flush:
455 nfp_net_tx_xmit_more_flush(tx_ring);
456 u64_stats_update_begin(&r_vec->tx_sync);
457 r_vec->tx_errors++;
458 u64_stats_update_end(&r_vec->tx_sync);
459 dev_kfree_skb_any(skb);
460 return NETDEV_TX_OK;
461 }
462
463 /**
464 * nfp_nfdk_tx_complete() - Handled completed TX packets
465 * @tx_ring: TX ring structure
466 * @budget: NAPI budget (only used as bool to determine if in NAPI context)
467 */
nfp_nfdk_tx_complete(struct nfp_net_tx_ring * tx_ring,int budget)468 static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget)
469 {
470 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
471 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
472 u32 done_pkts = 0, done_bytes = 0;
473 struct nfp_nfdk_tx_buf *ktxbufs;
474 struct device *dev = dp->dev;
475 struct netdev_queue *nd_q;
476 u32 rd_p, qcp_rd_p;
477 int todo;
478
479 rd_p = tx_ring->rd_p;
480 if (tx_ring->wr_p == rd_p)
481 return;
482
483 /* Work out how many descriptors have been transmitted */
484 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
485
486 if (qcp_rd_p == tx_ring->qcp_rd_p)
487 return;
488
489 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
490 ktxbufs = tx_ring->ktxbufs;
491
492 while (todo > 0) {
493 const skb_frag_t *frag, *fend;
494 unsigned int size, n_descs = 1;
495 struct nfp_nfdk_tx_buf *txbuf;
496 struct sk_buff *skb;
497
498 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)];
499 skb = txbuf->skb;
500 txbuf++;
501
502 /* Closed block */
503 if (!skb) {
504 n_descs = D_BLOCK_CPL(rd_p);
505 goto next;
506 }
507
508 /* Unmap head */
509 size = skb_headlen(skb);
510 n_descs += nfp_nfdk_headlen_to_segs(size);
511 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);
512 txbuf++;
513
514 /* Unmap frags */
515 frag = skb_shinfo(skb)->frags;
516 fend = frag + skb_shinfo(skb)->nr_frags;
517 for (; frag < fend; frag++) {
518 size = skb_frag_size(frag);
519 n_descs += DIV_ROUND_UP(size,
520 NFDK_TX_MAX_DATA_PER_DESC);
521 dma_unmap_page(dev, txbuf->dma_addr,
522 skb_frag_size(frag), DMA_TO_DEVICE);
523 txbuf++;
524 }
525
526 if (!skb_is_gso(skb)) {
527 done_bytes += skb->len;
528 done_pkts++;
529 } else {
530 done_bytes += txbuf->real_len;
531 done_pkts += txbuf->pkt_cnt;
532 n_descs++;
533 }
534
535 napi_consume_skb(skb, budget);
536 next:
537 rd_p += n_descs;
538 todo -= n_descs;
539 }
540
541 tx_ring->rd_p = rd_p;
542 tx_ring->qcp_rd_p = qcp_rd_p;
543
544 u64_stats_update_begin(&r_vec->tx_sync);
545 r_vec->tx_bytes += done_bytes;
546 r_vec->tx_pkts += done_pkts;
547 u64_stats_update_end(&r_vec->tx_sync);
548
549 if (!dp->netdev)
550 return;
551
552 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
553 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
554 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) {
555 /* Make sure TX thread will see updated tx_ring->rd_p */
556 smp_mb();
557
558 if (unlikely(netif_tx_queue_stopped(nd_q)))
559 netif_tx_wake_queue(nd_q);
560 }
561
562 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
563 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
564 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
565 }
566
567 /* Receive processing */
568 static void *
nfp_nfdk_napi_alloc_one(struct nfp_net_dp * dp,dma_addr_t * dma_addr)569 nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
570 {
571 void *frag;
572
573 if (!dp->xdp_prog) {
574 frag = napi_alloc_frag(dp->fl_bufsz);
575 if (unlikely(!frag))
576 return NULL;
577 } else {
578 struct page *page;
579
580 page = dev_alloc_page();
581 if (unlikely(!page))
582 return NULL;
583 frag = page_address(page);
584 }
585
586 *dma_addr = nfp_net_dma_map_rx(dp, frag);
587 if (dma_mapping_error(dp->dev, *dma_addr)) {
588 nfp_net_free_frag(frag, dp->xdp_prog);
589 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
590 return NULL;
591 }
592
593 return frag;
594 }
595
596 /**
597 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings
598 * @dp: NFP Net data path struct
599 * @rx_ring: RX ring structure
600 * @frag: page fragment buffer
601 * @dma_addr: DMA address of skb mapping
602 */
603 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)604 nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp,
605 struct nfp_net_rx_ring *rx_ring,
606 void *frag, dma_addr_t dma_addr)
607 {
608 unsigned int wr_idx;
609
610 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
611
612 nfp_net_dma_sync_dev_rx(dp, dma_addr);
613
614 /* Stash SKB and DMA address away */
615 rx_ring->rxbufs[wr_idx].frag = frag;
616 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
617
618 /* Fill freelist descriptor */
619 rx_ring->rxds[wr_idx].fld.reserved = 0;
620 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
621 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld,
622 dma_addr + dp->rx_dma_off);
623
624 rx_ring->wr_p++;
625 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {
626 /* Update write pointer of the freelist queue. Make
627 * sure all writes are flushed before telling the hardware.
628 */
629 wmb();
630 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);
631 }
632 }
633
634 /**
635 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW
636 * @dp: NFP Net data path struct
637 * @rx_ring: RX ring to fill
638 */
nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp * dp,struct nfp_net_rx_ring * rx_ring)639 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp,
640 struct nfp_net_rx_ring *rx_ring)
641 {
642 unsigned int i;
643
644 for (i = 0; i < rx_ring->cnt - 1; i++)
645 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
646 rx_ring->rxbufs[i].dma_addr);
647 }
648
649 /**
650 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors
651 * @flags: RX descriptor flags field in CPU byte order
652 */
nfp_nfdk_rx_csum_has_errors(u16 flags)653 static int nfp_nfdk_rx_csum_has_errors(u16 flags)
654 {
655 u16 csum_all_checked, csum_all_ok;
656
657 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
658 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
659
660 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
661 }
662
663 /**
664 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags
665 * @dp: NFP Net data path struct
666 * @r_vec: per-ring structure
667 * @rxd: Pointer to RX descriptor
668 * @meta: Parsed metadata prepend
669 * @skb: Pointer to SKB
670 */
671 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)672 nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
673 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta,
674 struct sk_buff *skb)
675 {
676 skb_checksum_none_assert(skb);
677
678 if (!(dp->netdev->features & NETIF_F_RXCSUM))
679 return;
680
681 if (meta->csum_type) {
682 skb->ip_summed = meta->csum_type;
683 skb->csum = meta->csum;
684 u64_stats_update_begin(&r_vec->rx_sync);
685 r_vec->hw_csum_rx_complete++;
686 u64_stats_update_end(&r_vec->rx_sync);
687 return;
688 }
689
690 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
691 u64_stats_update_begin(&r_vec->rx_sync);
692 r_vec->hw_csum_rx_error++;
693 u64_stats_update_end(&r_vec->rx_sync);
694 return;
695 }
696
697 /* Assume that the firmware will never report inner CSUM_OK unless outer
698 * L4 headers were successfully parsed. FW will always report zero UDP
699 * checksum as CSUM_OK.
700 */
701 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
702 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
703 __skb_incr_checksum_unnecessary(skb);
704 u64_stats_update_begin(&r_vec->rx_sync);
705 r_vec->hw_csum_rx_ok++;
706 u64_stats_update_end(&r_vec->rx_sync);
707 }
708
709 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
710 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
711 __skb_incr_checksum_unnecessary(skb);
712 u64_stats_update_begin(&r_vec->rx_sync);
713 r_vec->hw_csum_rx_inner_ok++;
714 u64_stats_update_end(&r_vec->rx_sync);
715 }
716 }
717
718 static void
nfp_nfdk_set_hash(struct net_device * netdev,struct nfp_meta_parsed * meta,unsigned int type,__be32 * hash)719 nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,
720 unsigned int type, __be32 *hash)
721 {
722 if (!(netdev->features & NETIF_F_RXHASH))
723 return;
724
725 switch (type) {
726 case NFP_NET_RSS_IPV4:
727 case NFP_NET_RSS_IPV6:
728 case NFP_NET_RSS_IPV6_EX:
729 meta->hash_type = PKT_HASH_TYPE_L3;
730 break;
731 default:
732 meta->hash_type = PKT_HASH_TYPE_L4;
733 break;
734 }
735
736 meta->hash = get_unaligned_be32(hash);
737 }
738
739 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)740 nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
741 void *data, void *pkt, unsigned int pkt_len, int meta_len)
742 {
743 u32 meta_info, vlan_info;
744
745 meta_info = get_unaligned_be32(data);
746 data += 4;
747
748 while (meta_info) {
749 switch (meta_info & NFP_NET_META_FIELD_MASK) {
750 case NFP_NET_META_HASH:
751 meta_info >>= NFP_NET_META_FIELD_SIZE;
752 nfp_nfdk_set_hash(netdev, meta,
753 meta_info & NFP_NET_META_FIELD_MASK,
754 (__be32 *)data);
755 data += 4;
756 break;
757 case NFP_NET_META_MARK:
758 meta->mark = get_unaligned_be32(data);
759 data += 4;
760 break;
761 case NFP_NET_META_VLAN:
762 vlan_info = get_unaligned_be32(data);
763 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) {
764 meta->vlan.stripped = true;
765 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK,
766 vlan_info);
767 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK,
768 vlan_info);
769 }
770 data += 4;
771 break;
772 case NFP_NET_META_PORTID:
773 meta->portid = get_unaligned_be32(data);
774 data += 4;
775 break;
776 case NFP_NET_META_CSUM:
777 meta->csum_type = CHECKSUM_COMPLETE;
778 meta->csum =
779 (__force __wsum)__get_unaligned_cpu32(data);
780 data += 4;
781 break;
782 case NFP_NET_META_RESYNC_INFO:
783 if (nfp_net_tls_rx_resync_req(netdev, data, pkt,
784 pkt_len))
785 return false;
786 data += sizeof(struct nfp_net_tls_resync_req);
787 break;
788 #ifdef CONFIG_NFP_NET_IPSEC
789 case NFP_NET_META_IPSEC:
790 /* Note: IPsec packet could have zero saidx, so need add 1
791 * to indicate packet is IPsec packet within driver.
792 */
793 meta->ipsec_saidx = get_unaligned_be32(data) + 1;
794 data += 4;
795 break;
796 #endif
797 default:
798 return true;
799 }
800
801 meta_info >>= NFP_NET_META_FIELD_SIZE;
802 }
803
804 return data != pkt;
805 }
806
807 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)808 nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
809 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
810 struct sk_buff *skb)
811 {
812 u64_stats_update_begin(&r_vec->rx_sync);
813 r_vec->rx_drops++;
814 /* If we have both skb and rxbuf the replacement buffer allocation
815 * must have failed, count this as an alloc failure.
816 */
817 if (skb && rxbuf)
818 r_vec->rx_replace_buf_alloc_fail++;
819 u64_stats_update_end(&r_vec->rx_sync);
820
821 /* skb is build based on the frag, free_skb() would free the frag
822 * so to be able to reuse it we need an extra ref.
823 */
824 if (skb && rxbuf && skb->head == rxbuf->frag)
825 page_ref_inc(virt_to_head_page(rxbuf->frag));
826 if (rxbuf)
827 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
828 if (skb)
829 dev_kfree_skb_any(skb);
830 }
831
nfp_nfdk_xdp_complete(struct nfp_net_tx_ring * tx_ring)832 static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring)
833 {
834 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
835 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
836 struct nfp_net_rx_ring *rx_ring;
837 u32 qcp_rd_p, done = 0;
838 bool done_all;
839 int todo;
840
841 /* Work out how many descriptors have been transmitted */
842 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
843 if (qcp_rd_p == tx_ring->qcp_rd_p)
844 return true;
845
846 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
847
848 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
849 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
850
851 rx_ring = r_vec->rx_ring;
852 while (todo > 0) {
853 int idx = D_IDX(tx_ring, tx_ring->rd_p + done);
854 struct nfp_nfdk_tx_buf *txbuf;
855 unsigned int step = 1;
856
857 txbuf = &tx_ring->ktxbufs[idx];
858 if (!txbuf->raw)
859 goto next;
860
861 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) {
862 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n");
863 goto next;
864 }
865
866 /* Two successive txbufs are used to stash virtual and dma
867 * address respectively, recycle and clean them here.
868 */
869 nfp_nfdk_rx_give_one(dp, rx_ring,
870 (void *)NFDK_TX_BUF_PTR(txbuf[0].val),
871 txbuf[1].dma_addr);
872 txbuf[0].raw = 0;
873 txbuf[1].raw = 0;
874 step = 2;
875
876 u64_stats_update_begin(&r_vec->tx_sync);
877 /* Note: tx_bytes not accumulated. */
878 r_vec->tx_pkts++;
879 u64_stats_update_end(&r_vec->tx_sync);
880 next:
881 todo -= step;
882 done += step;
883 }
884
885 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done);
886 tx_ring->rd_p += done;
887
888 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
889 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
890 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
891
892 return done_all;
893 }
894
895 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)896 nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
897 struct nfp_net_tx_ring *tx_ring,
898 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
899 unsigned int pkt_len, bool *completed)
900 {
901 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA;
902 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen;
903 struct nfp_nfdk_tx_buf *txbuf;
904 struct nfp_nfdk_tx_desc *txd;
905 unsigned int n_descs;
906 dma_addr_t dma_addr;
907 int wr_idx;
908
909 /* Reject if xdp_adjust_tail grow packet beyond DMA area */
910 if (pkt_len + dma_off > dma_map_sz)
911 return false;
912
913 /* Make sure there's still at least one block available after
914 * aligning to block boundary, so that the txds used below
915 * won't wrap around the tx_ring.
916 */
917 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
918 if (!*completed) {
919 nfp_nfdk_xdp_complete(tx_ring);
920 *completed = true;
921 }
922
923 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
924 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
925 NULL);
926 return false;
927 }
928 }
929
930 /* Check if cross block boundary */
931 n_descs = nfp_nfdk_headlen_to_segs(pkt_len);
932 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
933 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) ||
934 ((u32)tx_ring->data_pending + pkt_len >
935 NFDK_TX_MAX_DATA_PER_BLOCK)) {
936 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p);
937
938 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
939 txd = &tx_ring->ktxds[wr_idx];
940 memset(txd, 0,
941 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
942
943 tx_ring->data_pending = 0;
944 tx_ring->wr_p += nop_slots;
945 tx_ring->wr_ptr_add += nop_slots;
946 }
947
948 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
949
950 txbuf = &tx_ring->ktxbufs[wr_idx];
951
952 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP;
953 txbuf[1].dma_addr = rxbuf->dma_addr;
954 /* Note: pkt len not stored */
955
956 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
957 pkt_len, DMA_BIDIRECTIONAL);
958
959 /* Build TX descriptor */
960 txd = &tx_ring->ktxds[wr_idx];
961 dma_len = pkt_len;
962 dma_addr = rxbuf->dma_addr + dma_off;
963
964 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
965 type = NFDK_DESC_TX_TYPE_SIMPLE;
966 else
967 type = NFDK_DESC_TX_TYPE_GATHER;
968
969 /* FIELD_PREP() implicitly truncates to chunk */
970 dma_len -= 1;
971 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
972 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
973 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
974 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
975
976 txd->dma_len_type = cpu_to_le16(dlen_type);
977 nfp_desc_set_dma_addr_48b(txd, dma_addr);
978
979 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
980 dma_len -= tmp_dlen;
981 dma_addr += tmp_dlen + 1;
982 txd++;
983
984 while (dma_len > 0) {
985 dma_len -= 1;
986 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
987 txd->dma_len_type = cpu_to_le16(dlen_type);
988 nfp_desc_set_dma_addr_48b(txd, dma_addr);
989
990 dlen_type &= NFDK_DESC_TX_DMA_LEN;
991 dma_len -= dlen_type;
992 dma_addr += dlen_type + 1;
993 txd++;
994 }
995
996 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
997
998 /* Metadata desc */
999 txd->raw = 0;
1000 txd++;
1001
1002 cnt = txd - tx_ring->ktxds - wr_idx;
1003 tx_ring->wr_p += cnt;
1004 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
1005 tx_ring->data_pending += pkt_len;
1006 else
1007 tx_ring->data_pending = 0;
1008
1009 tx_ring->wr_ptr_add += cnt;
1010 return true;
1011 }
1012
1013 /**
1014 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring
1015 * @rx_ring: RX ring to receive from
1016 * @budget: NAPI budget
1017 *
1018 * Note, this function is separated out from the napi poll function to
1019 * more cleanly separate packet receive code from other bookkeeping
1020 * functions performed in the napi poll function.
1021 *
1022 * Return: Number of packets received.
1023 */
nfp_nfdk_rx(struct nfp_net_rx_ring * rx_ring,int budget)1024 static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget)
1025 {
1026 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
1027 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
1028 struct nfp_net_tx_ring *tx_ring;
1029 struct bpf_prog *xdp_prog;
1030 bool xdp_tx_cmpl = false;
1031 unsigned int true_bufsz;
1032 struct sk_buff *skb;
1033 int pkts_polled = 0;
1034 struct xdp_buff xdp;
1035 int idx;
1036
1037 xdp_prog = READ_ONCE(dp->xdp_prog);
1038 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
1039 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM,
1040 &rx_ring->xdp_rxq);
1041 tx_ring = r_vec->xdp_ring;
1042
1043 while (pkts_polled < budget) {
1044 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1045 struct nfp_net_rx_buf *rxbuf;
1046 struct nfp_net_rx_desc *rxd;
1047 struct nfp_meta_parsed meta;
1048 bool redir_egress = false;
1049 struct net_device *netdev;
1050 dma_addr_t new_dma_addr;
1051 u32 meta_len_xdp = 0;
1052 void *new_frag;
1053
1054 idx = D_IDX(rx_ring, rx_ring->rd_p);
1055
1056 rxd = &rx_ring->rxds[idx];
1057 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1058 break;
1059
1060 /* Memory barrier to ensure that we won't do other reads
1061 * before the DD bit.
1062 */
1063 dma_rmb();
1064
1065 memset(&meta, 0, sizeof(meta));
1066
1067 rx_ring->rd_p++;
1068 pkts_polled++;
1069
1070 rxbuf = &rx_ring->rxbufs[idx];
1071 /* < meta_len >
1072 * <-- [rx_offset] -->
1073 * ---------------------------------------------------------
1074 * | [XX] | metadata | packet | XXXX |
1075 * ---------------------------------------------------------
1076 * <---------------- data_len --------------->
1077 *
1078 * The rx_offset is fixed for all packets, the meta_len can vary
1079 * on a packet by packet basis. If rx_offset is set to zero
1080 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
1081 * buffer and is immediately followed by the packet (no [XX]).
1082 */
1083 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1084 data_len = le16_to_cpu(rxd->rxd.data_len);
1085 pkt_len = data_len - meta_len;
1086
1087 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1088 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1089 pkt_off += meta_len;
1090 else
1091 pkt_off += dp->rx_offset;
1092 meta_off = pkt_off - meta_len;
1093
1094 /* Stats update */
1095 u64_stats_update_begin(&r_vec->rx_sync);
1096 r_vec->rx_pkts++;
1097 r_vec->rx_bytes += pkt_len;
1098 u64_stats_update_end(&r_vec->rx_sync);
1099
1100 if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
1101 (dp->rx_offset && meta_len > dp->rx_offset))) {
1102 nn_dp_warn(dp, "oversized RX packet metadata %u\n",
1103 meta_len);
1104 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1105 continue;
1106 }
1107
1108 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,
1109 data_len);
1110
1111 if (meta_len) {
1112 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta,
1113 rxbuf->frag + meta_off,
1114 rxbuf->frag + pkt_off,
1115 pkt_len, meta_len))) {
1116 nn_dp_warn(dp, "invalid RX packet metadata\n");
1117 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1118 NULL);
1119 continue;
1120 }
1121 }
1122
1123 if (xdp_prog && !meta.portid) {
1124 void *orig_data = rxbuf->frag + pkt_off;
1125 unsigned int dma_off;
1126 int act;
1127
1128 xdp_prepare_buff(&xdp,
1129 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM,
1130 pkt_off - NFP_NET_RX_BUF_HEADROOM,
1131 pkt_len, true);
1132
1133 act = bpf_prog_run_xdp(xdp_prog, &xdp);
1134
1135 pkt_len = xdp.data_end - xdp.data;
1136 pkt_off += xdp.data - orig_data;
1137
1138 switch (act) {
1139 case XDP_PASS:
1140 meta_len_xdp = xdp.data - xdp.data_meta;
1141 break;
1142 case XDP_TX:
1143 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
1144 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring,
1145 tx_ring,
1146 rxbuf,
1147 dma_off,
1148 pkt_len,
1149 &xdp_tx_cmpl)))
1150 trace_xdp_exception(dp->netdev,
1151 xdp_prog, act);
1152 continue;
1153 default:
1154 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act);
1155 fallthrough;
1156 case XDP_ABORTED:
1157 trace_xdp_exception(dp->netdev, xdp_prog, act);
1158 fallthrough;
1159 case XDP_DROP:
1160 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1161 rxbuf->dma_addr);
1162 continue;
1163 }
1164 }
1165
1166 if (likely(!meta.portid)) {
1167 netdev = dp->netdev;
1168 } else if (meta.portid == NFP_META_PORT_ID_CTRL) {
1169 struct nfp_net *nn = netdev_priv(dp->netdev);
1170
1171 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off,
1172 pkt_len);
1173 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1174 rxbuf->dma_addr);
1175 continue;
1176 } else {
1177 struct nfp_net *nn;
1178
1179 nn = netdev_priv(dp->netdev);
1180 netdev = nfp_app_dev_get(nn->app, meta.portid,
1181 &redir_egress);
1182 if (unlikely(!netdev)) {
1183 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1184 NULL);
1185 continue;
1186 }
1187
1188 if (nfp_netdev_is_nfp_repr(netdev))
1189 nfp_repr_inc_rx_stats(netdev, pkt_len);
1190 }
1191
1192 skb = build_skb(rxbuf->frag, true_bufsz);
1193 if (unlikely(!skb)) {
1194 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1195 continue;
1196 }
1197 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1198 if (unlikely(!new_frag)) {
1199 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1200 continue;
1201 }
1202
1203 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1204
1205 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1206
1207 skb_reserve(skb, pkt_off);
1208 skb_put(skb, pkt_len);
1209
1210 skb->mark = meta.mark;
1211 skb_set_hash(skb, meta.hash, meta.hash_type);
1212
1213 skb_record_rx_queue(skb, rx_ring->idx);
1214 skb->protocol = eth_type_trans(skb, netdev);
1215
1216 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb);
1217
1218 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) {
1219 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
1220 continue;
1221 }
1222
1223 #ifdef CONFIG_NFP_NET_IPSEC
1224 if (meta.ipsec_saidx != 0 && unlikely(nfp_net_ipsec_rx(&meta, skb))) {
1225 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
1226 continue;
1227 }
1228 #endif
1229
1230 if (meta_len_xdp)
1231 skb_metadata_set(skb, meta_len_xdp);
1232
1233 if (likely(!redir_egress)) {
1234 napi_gro_receive(&rx_ring->r_vec->napi, skb);
1235 } else {
1236 skb->dev = netdev;
1237 skb_reset_network_header(skb);
1238 __skb_push(skb, ETH_HLEN);
1239 dev_queue_xmit(skb);
1240 }
1241 }
1242
1243 if (xdp_prog) {
1244 if (tx_ring->wr_ptr_add)
1245 nfp_net_tx_xmit_more_flush(tx_ring);
1246 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&
1247 !xdp_tx_cmpl)
1248 if (!nfp_nfdk_xdp_complete(tx_ring))
1249 pkts_polled = budget;
1250 }
1251
1252 return pkts_polled;
1253 }
1254
1255 /**
1256 * nfp_nfdk_poll() - napi poll function
1257 * @napi: NAPI structure
1258 * @budget: NAPI budget
1259 *
1260 * Return: number of packets polled.
1261 */
nfp_nfdk_poll(struct napi_struct * napi,int budget)1262 int nfp_nfdk_poll(struct napi_struct *napi, int budget)
1263 {
1264 struct nfp_net_r_vector *r_vec =
1265 container_of(napi, struct nfp_net_r_vector, napi);
1266 unsigned int pkts_polled = 0;
1267
1268 if (r_vec->tx_ring)
1269 nfp_nfdk_tx_complete(r_vec->tx_ring, budget);
1270 if (r_vec->rx_ring)
1271 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget);
1272
1273 if (pkts_polled < budget)
1274 if (napi_complete_done(napi, pkts_polled))
1275 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1276
1277 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) {
1278 struct dim_sample dim_sample = {};
1279 unsigned int start;
1280 u64 pkts, bytes;
1281
1282 do {
1283 start = u64_stats_fetch_begin(&r_vec->rx_sync);
1284 pkts = r_vec->rx_pkts;
1285 bytes = r_vec->rx_bytes;
1286 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
1287
1288 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1289 net_dim(&r_vec->rx_dim, dim_sample);
1290 }
1291
1292 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
1293 struct dim_sample dim_sample = {};
1294 unsigned int start;
1295 u64 pkts, bytes;
1296
1297 do {
1298 start = u64_stats_fetch_begin(&r_vec->tx_sync);
1299 pkts = r_vec->tx_pkts;
1300 bytes = r_vec->tx_bytes;
1301 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
1302
1303 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1304 net_dim(&r_vec->tx_dim, dim_sample);
1305 }
1306
1307 return pkts_polled;
1308 }
1309
1310 /* Control device data path
1311 */
1312
1313 bool
nfp_nfdk_ctrl_tx_one(struct nfp_net * nn,struct nfp_net_r_vector * r_vec,struct sk_buff * skb,bool old)1314 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
1315 struct sk_buff *skb, bool old)
1316 {
1317 u32 cnt, tmp_dlen, dlen_type = 0;
1318 struct nfp_net_tx_ring *tx_ring;
1319 struct nfp_nfdk_tx_buf *txbuf;
1320 struct nfp_nfdk_tx_desc *txd;
1321 unsigned int dma_len, type;
1322 struct nfp_net_dp *dp;
1323 dma_addr_t dma_addr;
1324 u64 metadata = 0;
1325 int wr_idx;
1326
1327 dp = &r_vec->nfp_net->dp;
1328 tx_ring = r_vec->tx_ring;
1329
1330 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {
1331 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");
1332 goto err_free;
1333 }
1334
1335 /* Don't bother counting frags, assume the worst */
1336 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
1337 u64_stats_update_begin(&r_vec->tx_sync);
1338 r_vec->tx_busy++;
1339 u64_stats_update_end(&r_vec->tx_sync);
1340 if (!old)
1341 __skb_queue_tail(&r_vec->queue, skb);
1342 else
1343 __skb_queue_head(&r_vec->queue, skb);
1344 return NETDEV_TX_BUSY;
1345 }
1346
1347 if (nfp_app_ctrl_has_meta(nn->app)) {
1348 if (unlikely(skb_headroom(skb) < 8)) {
1349 nn_dp_warn(dp, "CTRL TX on skb without headroom\n");
1350 goto err_free;
1351 }
1352 metadata = NFDK_DESC_TX_CHAIN_META;
1353 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
1354 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) |
1355 FIELD_PREP(NFDK_META_FIELDS,
1356 NFP_NET_META_PORTID),
1357 skb_push(skb, 4));
1358 }
1359
1360 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
1361 goto err_free;
1362
1363 /* DMA map all */
1364 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
1365 txd = &tx_ring->ktxds[wr_idx];
1366 txbuf = &tx_ring->ktxbufs[wr_idx];
1367
1368 dma_len = skb_headlen(skb);
1369 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
1370 type = NFDK_DESC_TX_TYPE_SIMPLE;
1371 else
1372 type = NFDK_DESC_TX_TYPE_GATHER;
1373
1374 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
1375 if (dma_mapping_error(dp->dev, dma_addr))
1376 goto err_warn_dma;
1377
1378 txbuf->skb = skb;
1379 txbuf++;
1380
1381 txbuf->dma_addr = dma_addr;
1382 txbuf++;
1383
1384 dma_len -= 1;
1385 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
1386 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
1387 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
1388 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
1389
1390 txd->dma_len_type = cpu_to_le16(dlen_type);
1391 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1392
1393 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
1394 dma_len -= tmp_dlen;
1395 dma_addr += tmp_dlen + 1;
1396 txd++;
1397
1398 while (dma_len > 0) {
1399 dma_len -= 1;
1400 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
1401 txd->dma_len_type = cpu_to_le16(dlen_type);
1402 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1403
1404 dlen_type &= NFDK_DESC_TX_DMA_LEN;
1405 dma_len -= dlen_type;
1406 dma_addr += dlen_type + 1;
1407 txd++;
1408 }
1409
1410 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
1411
1412 /* Metadata desc */
1413 txd->raw = cpu_to_le64(metadata);
1414 txd++;
1415
1416 cnt = txd - tx_ring->ktxds - wr_idx;
1417 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
1418 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
1419 goto err_warn_overflow;
1420
1421 tx_ring->wr_p += cnt;
1422 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
1423 tx_ring->data_pending += skb->len;
1424 else
1425 tx_ring->data_pending = 0;
1426
1427 tx_ring->wr_ptr_add += cnt;
1428 nfp_net_tx_xmit_more_flush(tx_ring);
1429
1430 return NETDEV_TX_OK;
1431
1432 err_warn_overflow:
1433 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
1434 wr_idx, skb_headlen(skb), 0, cnt);
1435 txbuf--;
1436 dma_unmap_single(dp->dev, txbuf->dma_addr,
1437 skb_headlen(skb), DMA_TO_DEVICE);
1438 txbuf->raw = 0;
1439 err_warn_dma:
1440 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
1441 err_free:
1442 u64_stats_update_begin(&r_vec->tx_sync);
1443 r_vec->tx_errors++;
1444 u64_stats_update_end(&r_vec->tx_sync);
1445 dev_kfree_skb_any(skb);
1446 return NETDEV_TX_OK;
1447 }
1448
__nfp_ctrl_tx_queued(struct nfp_net_r_vector * r_vec)1449 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)
1450 {
1451 struct sk_buff *skb;
1452
1453 while ((skb = __skb_dequeue(&r_vec->queue)))
1454 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))
1455 return;
1456 }
1457
1458 static bool
nfp_ctrl_meta_ok(struct nfp_net * nn,void * data,unsigned int meta_len)1459 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)
1460 {
1461 u32 meta_type, meta_tag;
1462
1463 if (!nfp_app_ctrl_has_meta(nn->app))
1464 return !meta_len;
1465
1466 if (meta_len != 8)
1467 return false;
1468
1469 meta_type = get_unaligned_be32(data);
1470 meta_tag = get_unaligned_be32(data + 4);
1471
1472 return (meta_type == NFP_NET_META_PORTID &&
1473 meta_tag == NFP_META_PORT_ID_CTRL);
1474 }
1475
1476 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)1477 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,
1478 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)
1479 {
1480 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1481 struct nfp_net_rx_buf *rxbuf;
1482 struct nfp_net_rx_desc *rxd;
1483 dma_addr_t new_dma_addr;
1484 struct sk_buff *skb;
1485 void *new_frag;
1486 int idx;
1487
1488 idx = D_IDX(rx_ring, rx_ring->rd_p);
1489
1490 rxd = &rx_ring->rxds[idx];
1491 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1492 return false;
1493
1494 /* Memory barrier to ensure that we won't do other reads
1495 * before the DD bit.
1496 */
1497 dma_rmb();
1498
1499 rx_ring->rd_p++;
1500
1501 rxbuf = &rx_ring->rxbufs[idx];
1502 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1503 data_len = le16_to_cpu(rxd->rxd.data_len);
1504 pkt_len = data_len - meta_len;
1505
1506 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1507 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1508 pkt_off += meta_len;
1509 else
1510 pkt_off += dp->rx_offset;
1511 meta_off = pkt_off - meta_len;
1512
1513 /* Stats update */
1514 u64_stats_update_begin(&r_vec->rx_sync);
1515 r_vec->rx_pkts++;
1516 r_vec->rx_bytes += pkt_len;
1517 u64_stats_update_end(&r_vec->rx_sync);
1518
1519 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);
1520
1521 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {
1522 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",
1523 meta_len);
1524 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1525 return true;
1526 }
1527
1528 skb = build_skb(rxbuf->frag, dp->fl_bufsz);
1529 if (unlikely(!skb)) {
1530 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1531 return true;
1532 }
1533 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1534 if (unlikely(!new_frag)) {
1535 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1536 return true;
1537 }
1538
1539 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1540
1541 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1542
1543 skb_reserve(skb, pkt_off);
1544 skb_put(skb, pkt_len);
1545
1546 nfp_app_ctrl_rx(nn->app, skb);
1547
1548 return true;
1549 }
1550
nfp_ctrl_rx(struct nfp_net_r_vector * r_vec)1551 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)
1552 {
1553 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;
1554 struct nfp_net *nn = r_vec->nfp_net;
1555 struct nfp_net_dp *dp = &nn->dp;
1556 unsigned int budget = 512;
1557
1558 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--)
1559 continue;
1560
1561 return budget;
1562 }
1563
nfp_nfdk_ctrl_poll(struct tasklet_struct * t)1564 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t)
1565 {
1566 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet);
1567
1568 spin_lock(&r_vec->lock);
1569 nfp_nfdk_tx_complete(r_vec->tx_ring, 0);
1570 __nfp_ctrl_tx_queued(r_vec);
1571 spin_unlock(&r_vec->lock);
1572
1573 if (nfp_ctrl_rx(r_vec)) {
1574 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1575 } else {
1576 tasklet_schedule(&r_vec->tasklet);
1577 nn_dp_warn(&r_vec->nfp_net->dp,
1578 "control message budget exceeded!\n");
1579 }
1580 }
1581