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, l4_hdrlen;
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 l4_hdrlen = (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ?
51 sizeof(struct udphdr) : tcp_hdrlen(skb);
52 } else {
53 l3_offset = skb_inner_network_offset(skb);
54 l4_offset = skb_inner_transport_offset(skb);
55 l4_hdrlen = (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ?
56 sizeof(struct udphdr) : inner_tcp_hdrlen(skb);
57 }
58
59 hdrlen = l4_offset + l4_hdrlen;
60 segs = skb_shinfo(skb)->gso_segs;
61 mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK;
62
63 txd.l3_offset = l3_offset;
64 txd.l4_offset = l4_offset;
65 txd.lso_meta_res = 0;
66 txd.mss = cpu_to_le16(mss);
67 txd.lso_hdrlen = hdrlen;
68 txd.lso_totsegs = segs;
69
70 txbuf->pkt_cnt = segs;
71 txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1);
72
73 u64_stats_update_begin(&r_vec->tx_sync);
74 r_vec->tx_lso++;
75 u64_stats_update_end(&r_vec->tx_sync);
76
77 return txd.raw;
78 }
79
80 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)81 nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
82 unsigned int pkt_cnt, struct sk_buff *skb, u64 flags)
83 {
84 struct ipv6hdr *ipv6h;
85 struct iphdr *iph;
86
87 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
88 return flags;
89
90 if (skb->ip_summed != CHECKSUM_PARTIAL)
91 return flags;
92
93 flags |= NFDK_DESC_TX_L4_CSUM;
94
95 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
96 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
97
98 /* L3 checksum offloading flag is not required for ipv6 */
99 if (iph->version == 4) {
100 flags |= NFDK_DESC_TX_L3_CSUM;
101 } else if (ipv6h->version != 6) {
102 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
103 return flags;
104 }
105
106 u64_stats_update_begin(&r_vec->tx_sync);
107 if (!skb->encapsulation) {
108 r_vec->hw_csum_tx += pkt_cnt;
109 } else {
110 flags |= NFDK_DESC_TX_ENCAP;
111 r_vec->hw_csum_tx_inner += pkt_cnt;
112 }
113 u64_stats_update_end(&r_vec->tx_sync);
114
115 return flags;
116 }
117
118 static int
nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring * tx_ring,struct sk_buff * skb)119 nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring,
120 struct sk_buff *skb)
121 {
122 unsigned int n_descs, wr_p, nop_slots;
123 const skb_frag_t *frag, *fend;
124 struct nfp_nfdk_tx_desc *txd;
125 unsigned int nr_frags;
126 unsigned int wr_idx;
127 int err;
128
129 recount_descs:
130 n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb));
131 nr_frags = skb_shinfo(skb)->nr_frags;
132 frag = skb_shinfo(skb)->frags;
133 fend = frag + nr_frags;
134 for (; frag < fend; frag++)
135 n_descs += DIV_ROUND_UP(skb_frag_size(frag),
136 NFDK_TX_MAX_DATA_PER_DESC);
137
138 if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) {
139 if (skb_is_nonlinear(skb)) {
140 err = skb_linearize(skb);
141 if (err)
142 return err;
143 goto recount_descs;
144 }
145 return -EINVAL;
146 }
147
148 /* Under count by 1 (don't count meta) for the round down to work out */
149 n_descs += !!skb_is_gso(skb);
150
151 if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
152 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT))
153 goto close_block;
154
155 if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK)
156 goto close_block;
157
158 return 0;
159
160 close_block:
161 wr_p = tx_ring->wr_p;
162 nop_slots = D_BLOCK_CPL(wr_p);
163
164 wr_idx = D_IDX(tx_ring, wr_p);
165 tx_ring->ktxbufs[wr_idx].skb = NULL;
166 txd = &tx_ring->ktxds[wr_idx];
167
168 memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
169
170 tx_ring->data_pending = 0;
171 tx_ring->wr_p += nop_slots;
172 tx_ring->wr_ptr_add += nop_slots;
173
174 return 0;
175 }
176
177 static int
nfp_nfdk_prep_tx_meta(struct nfp_net_dp * dp,struct nfp_app * app,struct sk_buff * skb,bool * ipsec)178 nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app,
179 struct sk_buff *skb, bool *ipsec)
180 {
181 struct metadata_dst *md_dst = skb_metadata_dst(skb);
182 struct nfp_ipsec_offload offload_info;
183 unsigned char *data;
184 bool vlan_insert;
185 u32 meta_id = 0;
186 int md_bytes;
187
188 #ifdef CONFIG_NFP_NET_IPSEC
189 if (xfrm_offload(skb))
190 *ipsec = nfp_net_ipsec_tx_prep(dp, skb, &offload_info);
191 #endif
192
193 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX))
194 md_dst = NULL;
195
196 vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2);
197
198 if (!(md_dst || vlan_insert || *ipsec))
199 return 0;
200
201 md_bytes = sizeof(meta_id) +
202 (!!md_dst ? NFP_NET_META_PORTID_SIZE : 0) +
203 (vlan_insert ? NFP_NET_META_VLAN_SIZE : 0) +
204 (*ipsec ? NFP_NET_META_IPSEC_FIELD_SIZE : 0);
205
206 if (unlikely(skb_cow_head(skb, md_bytes)))
207 return -ENOMEM;
208
209 data = skb_push(skb, md_bytes) + md_bytes;
210 if (md_dst) {
211 data -= NFP_NET_META_PORTID_SIZE;
212 put_unaligned_be32(md_dst->u.port_info.port_id, data);
213 meta_id = NFP_NET_META_PORTID;
214 }
215 if (vlan_insert) {
216 data -= NFP_NET_META_VLAN_SIZE;
217 /* data type of skb->vlan_proto is __be16
218 * so it fills metadata without calling put_unaligned_be16
219 */
220 memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto));
221 put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto));
222 meta_id <<= NFP_NET_META_FIELD_SIZE;
223 meta_id |= NFP_NET_META_VLAN;
224 }
225
226 if (*ipsec) {
227 data -= NFP_NET_META_IPSEC_SIZE;
228 put_unaligned_be32(offload_info.seq_hi, data);
229 data -= NFP_NET_META_IPSEC_SIZE;
230 put_unaligned_be32(offload_info.seq_low, data);
231 data -= NFP_NET_META_IPSEC_SIZE;
232 put_unaligned_be32(offload_info.handle - 1, data);
233 meta_id <<= NFP_NET_META_IPSEC_FIELD_SIZE;
234 meta_id |= NFP_NET_META_IPSEC << 8 | NFP_NET_META_IPSEC << 4 | NFP_NET_META_IPSEC;
235 }
236
237 meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) |
238 FIELD_PREP(NFDK_META_FIELDS, meta_id);
239
240 data -= sizeof(meta_id);
241 put_unaligned_be32(meta_id, data);
242
243 return NFDK_DESC_TX_CHAIN_META;
244 }
245
246 /**
247 * nfp_nfdk_tx() - Main transmit entry point
248 * @skb: SKB to transmit
249 * @netdev: netdev structure
250 *
251 * Return: NETDEV_TX_OK on success.
252 */
nfp_nfdk_tx(struct sk_buff * skb,struct net_device * netdev)253 netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
254 {
255 struct nfp_net *nn = netdev_priv(netdev);
256 struct nfp_nfdk_tx_buf *txbuf, *etxbuf;
257 u32 cnt, tmp_dlen, dlen_type = 0;
258 struct nfp_net_tx_ring *tx_ring;
259 struct nfp_net_r_vector *r_vec;
260 const skb_frag_t *frag, *fend;
261 struct nfp_nfdk_tx_desc *txd;
262 unsigned int real_len, qidx;
263 unsigned int dma_len, type;
264 struct netdev_queue *nd_q;
265 struct nfp_net_dp *dp;
266 int nr_frags, wr_idx;
267 dma_addr_t dma_addr;
268 bool ipsec = false;
269 u64 metadata;
270
271 dp = &nn->dp;
272 qidx = skb_get_queue_mapping(skb);
273 tx_ring = &dp->tx_rings[qidx];
274 r_vec = tx_ring->r_vec;
275 nd_q = netdev_get_tx_queue(dp->netdev, qidx);
276
277 /* Don't bother counting frags, assume the worst */
278 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
279 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",
280 qidx, tx_ring->wr_p, tx_ring->rd_p);
281 netif_tx_stop_queue(nd_q);
282 nfp_net_tx_xmit_more_flush(tx_ring);
283 u64_stats_update_begin(&r_vec->tx_sync);
284 r_vec->tx_busy++;
285 u64_stats_update_end(&r_vec->tx_sync);
286 return NETDEV_TX_BUSY;
287 }
288
289 metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb, &ipsec);
290 if (unlikely((int)metadata < 0))
291 goto err_flush;
292
293 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
294 goto err_flush;
295
296 /* nr_frags will change after skb_linearize so we get nr_frags after
297 * nfp_nfdk_tx_maybe_close_block function
298 */
299 nr_frags = skb_shinfo(skb)->nr_frags;
300 /* DMA map all */
301 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
302 txd = &tx_ring->ktxds[wr_idx];
303 txbuf = &tx_ring->ktxbufs[wr_idx];
304
305 dma_len = skb_headlen(skb);
306 if (skb_is_gso(skb))
307 type = NFDK_DESC_TX_TYPE_TSO;
308 else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
309 type = NFDK_DESC_TX_TYPE_SIMPLE;
310 else
311 type = NFDK_DESC_TX_TYPE_GATHER;
312
313 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
314 if (dma_mapping_error(dp->dev, dma_addr))
315 goto err_warn_dma;
316
317 txbuf->skb = skb;
318 txbuf++;
319
320 txbuf->dma_addr = dma_addr;
321 txbuf++;
322
323 /* FIELD_PREP() implicitly truncates to chunk */
324 dma_len -= 1;
325
326 /* We will do our best to pass as much data as we can in descriptor
327 * and we need to make sure the first descriptor includes whole head
328 * since there is limitation in firmware side. Sometimes the value of
329 * dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than
330 * headlen.
331 */
332 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
333 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
334 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
335 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
336
337 txd->dma_len_type = cpu_to_le16(dlen_type);
338 nfp_desc_set_dma_addr_48b(txd, dma_addr);
339
340 /* starts at bit 0 */
341 BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1));
342
343 /* Preserve the original dlen_type, this way below the EOP logic
344 * can use dlen_type.
345 */
346 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
347 dma_len -= tmp_dlen;
348 dma_addr += tmp_dlen + 1;
349 txd++;
350
351 /* The rest of the data (if any) will be in larger dma descritors
352 * and is handled with the fragment loop.
353 */
354 frag = skb_shinfo(skb)->frags;
355 fend = frag + nr_frags;
356
357 while (true) {
358 while (dma_len > 0) {
359 dma_len -= 1;
360 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
361
362 txd->dma_len_type = cpu_to_le16(dlen_type);
363 nfp_desc_set_dma_addr_48b(txd, dma_addr);
364
365 dma_len -= dlen_type;
366 dma_addr += dlen_type + 1;
367 txd++;
368 }
369
370 if (frag >= fend)
371 break;
372
373 dma_len = skb_frag_size(frag);
374 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len,
375 DMA_TO_DEVICE);
376 if (dma_mapping_error(dp->dev, dma_addr))
377 goto err_unmap;
378
379 txbuf->dma_addr = dma_addr;
380 txbuf++;
381
382 frag++;
383 }
384
385 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
386
387 if (ipsec)
388 metadata = nfp_nfdk_ipsec_tx(metadata, skb);
389
390 if (!skb_is_gso(skb)) {
391 real_len = skb->len;
392 /* Metadata desc */
393 if (!ipsec)
394 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
395 txd->raw = cpu_to_le64(metadata);
396 txd++;
397 } else {
398 /* lso desc should be placed after metadata desc */
399 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);
400 real_len = txbuf->real_len;
401 /* Metadata desc */
402 if (!ipsec)
403 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
404 txd->raw = cpu_to_le64(metadata);
405 txd += 2;
406 txbuf++;
407 }
408
409 cnt = txd - tx_ring->ktxds - wr_idx;
410 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
411 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
412 goto err_warn_overflow;
413
414 skb_tx_timestamp(skb);
415
416 tx_ring->wr_p += cnt;
417 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
418 tx_ring->data_pending += skb->len;
419 else
420 tx_ring->data_pending = 0;
421
422 if (nfp_nfdk_tx_ring_should_stop(tx_ring))
423 nfp_nfdk_tx_ring_stop(nd_q, tx_ring);
424
425 tx_ring->wr_ptr_add += cnt;
426 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more()))
427 nfp_net_tx_xmit_more_flush(tx_ring);
428
429 return NETDEV_TX_OK;
430
431 err_warn_overflow:
432 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
433 wr_idx, skb_headlen(skb), nr_frags, cnt);
434 if (skb_is_gso(skb))
435 txbuf--;
436 err_unmap:
437 /* txbuf pointed to the next-to-use */
438 etxbuf = txbuf;
439 /* first txbuf holds the skb */
440 txbuf = &tx_ring->ktxbufs[wr_idx + 1];
441 if (txbuf < etxbuf) {
442 dma_unmap_single(dp->dev, txbuf->dma_addr,
443 skb_headlen(skb), DMA_TO_DEVICE);
444 txbuf->raw = 0;
445 txbuf++;
446 }
447 frag = skb_shinfo(skb)->frags;
448 while (etxbuf < txbuf) {
449 dma_unmap_page(dp->dev, txbuf->dma_addr,
450 skb_frag_size(frag), DMA_TO_DEVICE);
451 txbuf->raw = 0;
452 frag++;
453 txbuf++;
454 }
455 err_warn_dma:
456 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
457 err_flush:
458 nfp_net_tx_xmit_more_flush(tx_ring);
459 u64_stats_update_begin(&r_vec->tx_sync);
460 r_vec->tx_errors++;
461 u64_stats_update_end(&r_vec->tx_sync);
462 dev_kfree_skb_any(skb);
463 return NETDEV_TX_OK;
464 }
465
466 /**
467 * nfp_nfdk_tx_complete() - Handled completed TX packets
468 * @tx_ring: TX ring structure
469 * @budget: NAPI budget (only used as bool to determine if in NAPI context)
470 */
nfp_nfdk_tx_complete(struct nfp_net_tx_ring * tx_ring,int budget)471 static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget)
472 {
473 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
474 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
475 u32 done_pkts = 0, done_bytes = 0;
476 struct nfp_nfdk_tx_buf *ktxbufs;
477 struct device *dev = dp->dev;
478 struct netdev_queue *nd_q;
479 u32 rd_p, qcp_rd_p;
480 int todo;
481
482 rd_p = tx_ring->rd_p;
483 if (tx_ring->wr_p == rd_p)
484 return;
485
486 /* Work out how many descriptors have been transmitted */
487 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
488
489 if (qcp_rd_p == tx_ring->qcp_rd_p)
490 return;
491
492 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
493 ktxbufs = tx_ring->ktxbufs;
494
495 while (todo > 0) {
496 const skb_frag_t *frag, *fend;
497 unsigned int size, n_descs = 1;
498 struct nfp_nfdk_tx_buf *txbuf;
499 struct sk_buff *skb;
500
501 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)];
502 skb = txbuf->skb;
503 txbuf++;
504
505 /* Closed block */
506 if (!skb) {
507 n_descs = D_BLOCK_CPL(rd_p);
508 goto next;
509 }
510
511 /* Unmap head */
512 size = skb_headlen(skb);
513 n_descs += nfp_nfdk_headlen_to_segs(size);
514 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);
515 txbuf++;
516
517 /* Unmap frags */
518 frag = skb_shinfo(skb)->frags;
519 fend = frag + skb_shinfo(skb)->nr_frags;
520 for (; frag < fend; frag++) {
521 size = skb_frag_size(frag);
522 n_descs += DIV_ROUND_UP(size,
523 NFDK_TX_MAX_DATA_PER_DESC);
524 dma_unmap_page(dev, txbuf->dma_addr,
525 skb_frag_size(frag), DMA_TO_DEVICE);
526 txbuf++;
527 }
528
529 if (!skb_is_gso(skb)) {
530 done_bytes += skb->len;
531 done_pkts++;
532 } else {
533 done_bytes += txbuf->real_len;
534 done_pkts += txbuf->pkt_cnt;
535 n_descs++;
536 }
537
538 napi_consume_skb(skb, budget);
539 next:
540 rd_p += n_descs;
541 todo -= n_descs;
542 }
543
544 tx_ring->rd_p = rd_p;
545 tx_ring->qcp_rd_p = qcp_rd_p;
546
547 u64_stats_update_begin(&r_vec->tx_sync);
548 r_vec->tx_bytes += done_bytes;
549 r_vec->tx_pkts += done_pkts;
550 u64_stats_update_end(&r_vec->tx_sync);
551
552 if (!dp->netdev)
553 return;
554
555 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
556 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
557 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) {
558 /* Make sure TX thread will see updated tx_ring->rd_p */
559 smp_mb();
560
561 if (unlikely(netif_tx_queue_stopped(nd_q)))
562 netif_tx_wake_queue(nd_q);
563 }
564
565 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
566 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
567 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
568 }
569
570 /* Receive processing */
571 static void *
nfp_nfdk_napi_alloc_one(struct nfp_net_dp * dp,dma_addr_t * dma_addr)572 nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
573 {
574 void *frag;
575
576 if (!dp->xdp_prog) {
577 frag = napi_alloc_frag(dp->fl_bufsz);
578 if (unlikely(!frag))
579 return NULL;
580 } else {
581 struct page *page;
582
583 page = dev_alloc_page();
584 if (unlikely(!page))
585 return NULL;
586 frag = page_address(page);
587 }
588
589 *dma_addr = nfp_net_dma_map_rx(dp, frag);
590 if (dma_mapping_error(dp->dev, *dma_addr)) {
591 nfp_net_free_frag(frag, dp->xdp_prog);
592 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
593 return NULL;
594 }
595
596 return frag;
597 }
598
599 /**
600 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings
601 * @dp: NFP Net data path struct
602 * @rx_ring: RX ring structure
603 * @frag: page fragment buffer
604 * @dma_addr: DMA address of skb mapping
605 */
606 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)607 nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp,
608 struct nfp_net_rx_ring *rx_ring,
609 void *frag, dma_addr_t dma_addr)
610 {
611 unsigned int wr_idx;
612
613 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
614
615 nfp_net_dma_sync_dev_rx(dp, dma_addr);
616
617 /* Stash SKB and DMA address away */
618 rx_ring->rxbufs[wr_idx].frag = frag;
619 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
620
621 /* Fill freelist descriptor */
622 rx_ring->rxds[wr_idx].fld.reserved = 0;
623 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
624 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld,
625 dma_addr + dp->rx_dma_off);
626
627 rx_ring->wr_p++;
628 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {
629 /* Update write pointer of the freelist queue. Make
630 * sure all writes are flushed before telling the hardware.
631 */
632 wmb();
633 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);
634 }
635 }
636
637 /**
638 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW
639 * @dp: NFP Net data path struct
640 * @rx_ring: RX ring to fill
641 */
nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp * dp,struct nfp_net_rx_ring * rx_ring)642 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp,
643 struct nfp_net_rx_ring *rx_ring)
644 {
645 unsigned int i;
646
647 for (i = 0; i < rx_ring->cnt - 1; i++)
648 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
649 rx_ring->rxbufs[i].dma_addr);
650 }
651
652 /**
653 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors
654 * @flags: RX descriptor flags field in CPU byte order
655 */
nfp_nfdk_rx_csum_has_errors(u16 flags)656 static int nfp_nfdk_rx_csum_has_errors(u16 flags)
657 {
658 u16 csum_all_checked, csum_all_ok;
659
660 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
661 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
662
663 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
664 }
665
666 /**
667 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags
668 * @dp: NFP Net data path struct
669 * @r_vec: per-ring structure
670 * @rxd: Pointer to RX descriptor
671 * @meta: Parsed metadata prepend
672 * @skb: Pointer to SKB
673 */
674 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)675 nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
676 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta,
677 struct sk_buff *skb)
678 {
679 skb_checksum_none_assert(skb);
680
681 if (!(dp->netdev->features & NETIF_F_RXCSUM))
682 return;
683
684 if (meta->csum_type) {
685 skb->ip_summed = meta->csum_type;
686 skb->csum = meta->csum;
687 u64_stats_update_begin(&r_vec->rx_sync);
688 r_vec->hw_csum_rx_complete++;
689 u64_stats_update_end(&r_vec->rx_sync);
690 return;
691 }
692
693 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
694 u64_stats_update_begin(&r_vec->rx_sync);
695 r_vec->hw_csum_rx_error++;
696 u64_stats_update_end(&r_vec->rx_sync);
697 return;
698 }
699
700 /* Assume that the firmware will never report inner CSUM_OK unless outer
701 * L4 headers were successfully parsed. FW will always report zero UDP
702 * checksum as CSUM_OK.
703 */
704 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
705 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
706 __skb_incr_checksum_unnecessary(skb);
707 u64_stats_update_begin(&r_vec->rx_sync);
708 r_vec->hw_csum_rx_ok++;
709 u64_stats_update_end(&r_vec->rx_sync);
710 }
711
712 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
713 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
714 __skb_incr_checksum_unnecessary(skb);
715 u64_stats_update_begin(&r_vec->rx_sync);
716 r_vec->hw_csum_rx_inner_ok++;
717 u64_stats_update_end(&r_vec->rx_sync);
718 }
719 }
720
721 static void
nfp_nfdk_set_hash(struct net_device * netdev,struct nfp_meta_parsed * meta,unsigned int type,__be32 * hash)722 nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,
723 unsigned int type, __be32 *hash)
724 {
725 if (!(netdev->features & NETIF_F_RXHASH))
726 return;
727
728 switch (type) {
729 case NFP_NET_RSS_IPV4:
730 case NFP_NET_RSS_IPV6:
731 case NFP_NET_RSS_IPV6_EX:
732 meta->hash_type = PKT_HASH_TYPE_L3;
733 break;
734 default:
735 meta->hash_type = PKT_HASH_TYPE_L4;
736 break;
737 }
738
739 meta->hash = get_unaligned_be32(hash);
740 }
741
742 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)743 nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
744 void *data, void *pkt, unsigned int pkt_len, int meta_len)
745 {
746 u32 meta_info, vlan_info;
747
748 meta_info = get_unaligned_be32(data);
749 data += 4;
750
751 while (meta_info) {
752 switch (meta_info & NFP_NET_META_FIELD_MASK) {
753 case NFP_NET_META_HASH:
754 meta_info >>= NFP_NET_META_FIELD_SIZE;
755 nfp_nfdk_set_hash(netdev, meta,
756 meta_info & NFP_NET_META_FIELD_MASK,
757 (__be32 *)data);
758 data += 4;
759 break;
760 case NFP_NET_META_MARK:
761 meta->mark = get_unaligned_be32(data);
762 data += 4;
763 break;
764 case NFP_NET_META_VLAN:
765 vlan_info = get_unaligned_be32(data);
766 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) {
767 meta->vlan.stripped = true;
768 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK,
769 vlan_info);
770 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK,
771 vlan_info);
772 }
773 data += 4;
774 break;
775 case NFP_NET_META_PORTID:
776 meta->portid = get_unaligned_be32(data);
777 data += 4;
778 break;
779 case NFP_NET_META_CSUM:
780 meta->csum_type = CHECKSUM_COMPLETE;
781 meta->csum =
782 (__force __wsum)__get_unaligned_cpu32(data);
783 data += 4;
784 break;
785 case NFP_NET_META_RESYNC_INFO:
786 if (nfp_net_tls_rx_resync_req(netdev, data, pkt,
787 pkt_len))
788 return false;
789 data += sizeof(struct nfp_net_tls_resync_req);
790 break;
791 #ifdef CONFIG_NFP_NET_IPSEC
792 case NFP_NET_META_IPSEC:
793 /* Note: IPsec packet could have zero saidx, so need add 1
794 * to indicate packet is IPsec packet within driver.
795 */
796 meta->ipsec_saidx = get_unaligned_be32(data) + 1;
797 data += 4;
798 break;
799 #endif
800 default:
801 return true;
802 }
803
804 meta_info >>= NFP_NET_META_FIELD_SIZE;
805 }
806
807 return data != pkt;
808 }
809
810 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)811 nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
812 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
813 struct sk_buff *skb)
814 {
815 u64_stats_update_begin(&r_vec->rx_sync);
816 r_vec->rx_drops++;
817 /* If we have both skb and rxbuf the replacement buffer allocation
818 * must have failed, count this as an alloc failure.
819 */
820 if (skb && rxbuf)
821 r_vec->rx_replace_buf_alloc_fail++;
822 u64_stats_update_end(&r_vec->rx_sync);
823
824 /* skb is build based on the frag, free_skb() would free the frag
825 * so to be able to reuse it we need an extra ref.
826 */
827 if (skb && rxbuf && skb->head == rxbuf->frag)
828 page_ref_inc(virt_to_head_page(rxbuf->frag));
829 if (rxbuf)
830 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
831 if (skb)
832 dev_kfree_skb_any(skb);
833 }
834
nfp_nfdk_xdp_complete(struct nfp_net_tx_ring * tx_ring)835 static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring)
836 {
837 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
838 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
839 struct nfp_net_rx_ring *rx_ring;
840 u32 qcp_rd_p, done = 0;
841 bool done_all;
842 int todo;
843
844 /* Work out how many descriptors have been transmitted */
845 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
846 if (qcp_rd_p == tx_ring->qcp_rd_p)
847 return true;
848
849 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
850
851 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
852 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
853
854 rx_ring = r_vec->rx_ring;
855 while (todo > 0) {
856 int idx = D_IDX(tx_ring, tx_ring->rd_p + done);
857 struct nfp_nfdk_tx_buf *txbuf;
858 unsigned int step = 1;
859
860 txbuf = &tx_ring->ktxbufs[idx];
861 if (!txbuf->raw)
862 goto next;
863
864 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) {
865 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n");
866 goto next;
867 }
868
869 /* Two successive txbufs are used to stash virtual and dma
870 * address respectively, recycle and clean them here.
871 */
872 nfp_nfdk_rx_give_one(dp, rx_ring,
873 (void *)NFDK_TX_BUF_PTR(txbuf[0].val),
874 txbuf[1].dma_addr);
875 txbuf[0].raw = 0;
876 txbuf[1].raw = 0;
877 step = 2;
878
879 u64_stats_update_begin(&r_vec->tx_sync);
880 /* Note: tx_bytes not accumulated. */
881 r_vec->tx_pkts++;
882 u64_stats_update_end(&r_vec->tx_sync);
883 next:
884 todo -= step;
885 done += step;
886 }
887
888 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done);
889 tx_ring->rd_p += done;
890
891 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
892 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
893 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
894
895 return done_all;
896 }
897
898 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)899 nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
900 struct nfp_net_tx_ring *tx_ring,
901 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
902 unsigned int pkt_len, bool *completed)
903 {
904 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA;
905 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen;
906 struct nfp_nfdk_tx_buf *txbuf;
907 struct nfp_nfdk_tx_desc *txd;
908 unsigned int n_descs;
909 dma_addr_t dma_addr;
910 int wr_idx;
911
912 /* Reject if xdp_adjust_tail grow packet beyond DMA area */
913 if (pkt_len + dma_off > dma_map_sz)
914 return false;
915
916 /* Make sure there's still at least one block available after
917 * aligning to block boundary, so that the txds used below
918 * won't wrap around the tx_ring.
919 */
920 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
921 if (!*completed) {
922 nfp_nfdk_xdp_complete(tx_ring);
923 *completed = true;
924 }
925
926 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
927 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
928 NULL);
929 return false;
930 }
931 }
932
933 /* Check if cross block boundary */
934 n_descs = nfp_nfdk_headlen_to_segs(pkt_len);
935 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
936 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) ||
937 ((u32)tx_ring->data_pending + pkt_len >
938 NFDK_TX_MAX_DATA_PER_BLOCK)) {
939 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p);
940
941 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
942 txd = &tx_ring->ktxds[wr_idx];
943 memset(txd, 0,
944 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
945
946 tx_ring->data_pending = 0;
947 tx_ring->wr_p += nop_slots;
948 tx_ring->wr_ptr_add += nop_slots;
949 }
950
951 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
952
953 txbuf = &tx_ring->ktxbufs[wr_idx];
954
955 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP;
956 txbuf[1].dma_addr = rxbuf->dma_addr;
957 /* Note: pkt len not stored */
958
959 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
960 pkt_len, DMA_BIDIRECTIONAL);
961
962 /* Build TX descriptor */
963 txd = &tx_ring->ktxds[wr_idx];
964 dma_len = pkt_len;
965 dma_addr = rxbuf->dma_addr + dma_off;
966
967 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
968 type = NFDK_DESC_TX_TYPE_SIMPLE;
969 else
970 type = NFDK_DESC_TX_TYPE_GATHER;
971
972 /* FIELD_PREP() implicitly truncates to chunk */
973 dma_len -= 1;
974 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
975 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
976 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
977 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
978
979 txd->dma_len_type = cpu_to_le16(dlen_type);
980 nfp_desc_set_dma_addr_48b(txd, dma_addr);
981
982 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
983 dma_len -= tmp_dlen;
984 dma_addr += tmp_dlen + 1;
985 txd++;
986
987 while (dma_len > 0) {
988 dma_len -= 1;
989 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
990 txd->dma_len_type = cpu_to_le16(dlen_type);
991 nfp_desc_set_dma_addr_48b(txd, dma_addr);
992
993 dlen_type &= NFDK_DESC_TX_DMA_LEN;
994 dma_len -= dlen_type;
995 dma_addr += dlen_type + 1;
996 txd++;
997 }
998
999 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
1000
1001 /* Metadata desc */
1002 txd->raw = 0;
1003 txd++;
1004
1005 cnt = txd - tx_ring->ktxds - wr_idx;
1006 tx_ring->wr_p += cnt;
1007 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
1008 tx_ring->data_pending += pkt_len;
1009 else
1010 tx_ring->data_pending = 0;
1011
1012 tx_ring->wr_ptr_add += cnt;
1013 return true;
1014 }
1015
1016 /**
1017 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring
1018 * @rx_ring: RX ring to receive from
1019 * @budget: NAPI budget
1020 *
1021 * Note, this function is separated out from the napi poll function to
1022 * more cleanly separate packet receive code from other bookkeeping
1023 * functions performed in the napi poll function.
1024 *
1025 * Return: Number of packets received.
1026 */
nfp_nfdk_rx(struct nfp_net_rx_ring * rx_ring,int budget)1027 static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget)
1028 {
1029 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
1030 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
1031 struct nfp_net_tx_ring *tx_ring;
1032 struct bpf_prog *xdp_prog;
1033 bool xdp_tx_cmpl = false;
1034 unsigned int true_bufsz;
1035 struct sk_buff *skb;
1036 int pkts_polled = 0;
1037 struct xdp_buff xdp;
1038 int idx;
1039
1040 xdp_prog = READ_ONCE(dp->xdp_prog);
1041 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
1042 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM,
1043 &rx_ring->xdp_rxq);
1044 tx_ring = r_vec->xdp_ring;
1045
1046 while (pkts_polled < budget) {
1047 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1048 struct nfp_net_rx_buf *rxbuf;
1049 struct nfp_net_rx_desc *rxd;
1050 struct nfp_meta_parsed meta;
1051 bool redir_egress = false;
1052 struct net_device *netdev;
1053 dma_addr_t new_dma_addr;
1054 u32 meta_len_xdp = 0;
1055 void *new_frag;
1056
1057 idx = D_IDX(rx_ring, rx_ring->rd_p);
1058
1059 rxd = &rx_ring->rxds[idx];
1060 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1061 break;
1062
1063 /* Memory barrier to ensure that we won't do other reads
1064 * before the DD bit.
1065 */
1066 dma_rmb();
1067
1068 memset(&meta, 0, sizeof(meta));
1069
1070 rx_ring->rd_p++;
1071 pkts_polled++;
1072
1073 rxbuf = &rx_ring->rxbufs[idx];
1074 /* < meta_len >
1075 * <-- [rx_offset] -->
1076 * ---------------------------------------------------------
1077 * | [XX] | metadata | packet | XXXX |
1078 * ---------------------------------------------------------
1079 * <---------------- data_len --------------->
1080 *
1081 * The rx_offset is fixed for all packets, the meta_len can vary
1082 * on a packet by packet basis. If rx_offset is set to zero
1083 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
1084 * buffer and is immediately followed by the packet (no [XX]).
1085 */
1086 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1087 data_len = le16_to_cpu(rxd->rxd.data_len);
1088 pkt_len = data_len - meta_len;
1089
1090 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1091 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1092 pkt_off += meta_len;
1093 else
1094 pkt_off += dp->rx_offset;
1095 meta_off = pkt_off - meta_len;
1096
1097 /* Stats update */
1098 u64_stats_update_begin(&r_vec->rx_sync);
1099 r_vec->rx_pkts++;
1100 r_vec->rx_bytes += pkt_len;
1101 u64_stats_update_end(&r_vec->rx_sync);
1102
1103 if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
1104 (dp->rx_offset && meta_len > dp->rx_offset))) {
1105 nn_dp_warn(dp, "oversized RX packet metadata %u\n",
1106 meta_len);
1107 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1108 continue;
1109 }
1110
1111 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,
1112 data_len);
1113
1114 if (meta_len) {
1115 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta,
1116 rxbuf->frag + meta_off,
1117 rxbuf->frag + pkt_off,
1118 pkt_len, meta_len))) {
1119 nn_dp_warn(dp, "invalid RX packet metadata\n");
1120 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1121 NULL);
1122 continue;
1123 }
1124 }
1125
1126 if (xdp_prog && !meta.portid) {
1127 void *orig_data = rxbuf->frag + pkt_off;
1128 unsigned int dma_off;
1129 int act;
1130
1131 xdp_prepare_buff(&xdp,
1132 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM,
1133 pkt_off - NFP_NET_RX_BUF_HEADROOM,
1134 pkt_len, true);
1135
1136 act = bpf_prog_run_xdp(xdp_prog, &xdp);
1137
1138 pkt_len = xdp.data_end - xdp.data;
1139 pkt_off += xdp.data - orig_data;
1140
1141 switch (act) {
1142 case XDP_PASS:
1143 meta_len_xdp = xdp.data - xdp.data_meta;
1144 break;
1145 case XDP_TX:
1146 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
1147 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring,
1148 tx_ring,
1149 rxbuf,
1150 dma_off,
1151 pkt_len,
1152 &xdp_tx_cmpl)))
1153 trace_xdp_exception(dp->netdev,
1154 xdp_prog, act);
1155 continue;
1156 default:
1157 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act);
1158 fallthrough;
1159 case XDP_ABORTED:
1160 trace_xdp_exception(dp->netdev, xdp_prog, act);
1161 fallthrough;
1162 case XDP_DROP:
1163 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1164 rxbuf->dma_addr);
1165 continue;
1166 }
1167 }
1168
1169 if (likely(!meta.portid)) {
1170 netdev = dp->netdev;
1171 } else if (meta.portid == NFP_META_PORT_ID_CTRL) {
1172 struct nfp_net *nn = netdev_priv(dp->netdev);
1173
1174 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off,
1175 pkt_len);
1176 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,
1177 rxbuf->dma_addr);
1178 continue;
1179 } else {
1180 struct nfp_net *nn;
1181
1182 nn = netdev_priv(dp->netdev);
1183 netdev = nfp_app_dev_get(nn->app, meta.portid,
1184 &redir_egress);
1185 if (unlikely(!netdev)) {
1186 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,
1187 NULL);
1188 continue;
1189 }
1190
1191 if (nfp_netdev_is_nfp_repr(netdev))
1192 nfp_repr_inc_rx_stats(netdev, pkt_len);
1193 }
1194
1195 skb = napi_build_skb(rxbuf->frag, true_bufsz);
1196 if (unlikely(!skb)) {
1197 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1198 continue;
1199 }
1200 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1201 if (unlikely(!new_frag)) {
1202 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1203 continue;
1204 }
1205
1206 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1207
1208 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1209
1210 skb_reserve(skb, pkt_off);
1211 skb_put(skb, pkt_len);
1212
1213 skb->mark = meta.mark;
1214 skb_set_hash(skb, meta.hash, meta.hash_type);
1215
1216 skb_record_rx_queue(skb, rx_ring->idx);
1217 skb->protocol = eth_type_trans(skb, netdev);
1218
1219 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb);
1220
1221 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) {
1222 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
1223 continue;
1224 }
1225
1226 #ifdef CONFIG_NFP_NET_IPSEC
1227 if (meta.ipsec_saidx != 0 && unlikely(nfp_net_ipsec_rx(&meta, skb))) {
1228 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
1229 continue;
1230 }
1231 #endif
1232
1233 if (meta_len_xdp)
1234 skb_metadata_set(skb, meta_len_xdp);
1235
1236 if (likely(!redir_egress)) {
1237 napi_gro_receive(&rx_ring->r_vec->napi, skb);
1238 } else {
1239 skb->dev = netdev;
1240 skb_reset_network_header(skb);
1241 __skb_push(skb, ETH_HLEN);
1242 dev_queue_xmit(skb);
1243 }
1244 }
1245
1246 if (xdp_prog) {
1247 if (tx_ring->wr_ptr_add)
1248 nfp_net_tx_xmit_more_flush(tx_ring);
1249 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&
1250 !xdp_tx_cmpl)
1251 if (!nfp_nfdk_xdp_complete(tx_ring))
1252 pkts_polled = budget;
1253 }
1254
1255 return pkts_polled;
1256 }
1257
1258 /**
1259 * nfp_nfdk_poll() - napi poll function
1260 * @napi: NAPI structure
1261 * @budget: NAPI budget
1262 *
1263 * Return: number of packets polled.
1264 */
nfp_nfdk_poll(struct napi_struct * napi,int budget)1265 int nfp_nfdk_poll(struct napi_struct *napi, int budget)
1266 {
1267 struct nfp_net_r_vector *r_vec =
1268 container_of(napi, struct nfp_net_r_vector, napi);
1269 unsigned int pkts_polled = 0;
1270
1271 if (r_vec->tx_ring)
1272 nfp_nfdk_tx_complete(r_vec->tx_ring, budget);
1273 if (r_vec->rx_ring)
1274 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget);
1275
1276 if (pkts_polled < budget)
1277 if (napi_complete_done(napi, pkts_polled))
1278 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1279
1280 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) {
1281 struct dim_sample dim_sample = {};
1282 unsigned int start;
1283 u64 pkts, bytes;
1284
1285 do {
1286 start = u64_stats_fetch_begin(&r_vec->rx_sync);
1287 pkts = r_vec->rx_pkts;
1288 bytes = r_vec->rx_bytes;
1289 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
1290
1291 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1292 net_dim(&r_vec->rx_dim, dim_sample);
1293 }
1294
1295 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
1296 struct dim_sample dim_sample = {};
1297 unsigned int start;
1298 u64 pkts, bytes;
1299
1300 do {
1301 start = u64_stats_fetch_begin(&r_vec->tx_sync);
1302 pkts = r_vec->tx_pkts;
1303 bytes = r_vec->tx_bytes;
1304 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
1305
1306 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
1307 net_dim(&r_vec->tx_dim, dim_sample);
1308 }
1309
1310 return pkts_polled;
1311 }
1312
1313 /* Control device data path
1314 */
1315
1316 bool
nfp_nfdk_ctrl_tx_one(struct nfp_net * nn,struct nfp_net_r_vector * r_vec,struct sk_buff * skb,bool old)1317 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
1318 struct sk_buff *skb, bool old)
1319 {
1320 u32 cnt, tmp_dlen, dlen_type = 0;
1321 struct nfp_net_tx_ring *tx_ring;
1322 struct nfp_nfdk_tx_buf *txbuf;
1323 struct nfp_nfdk_tx_desc *txd;
1324 unsigned int dma_len, type;
1325 struct nfp_net_dp *dp;
1326 dma_addr_t dma_addr;
1327 u64 metadata = 0;
1328 int wr_idx;
1329
1330 dp = &r_vec->nfp_net->dp;
1331 tx_ring = r_vec->tx_ring;
1332
1333 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {
1334 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");
1335 goto err_free;
1336 }
1337
1338 /* Don't bother counting frags, assume the worst */
1339 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
1340 u64_stats_update_begin(&r_vec->tx_sync);
1341 r_vec->tx_busy++;
1342 u64_stats_update_end(&r_vec->tx_sync);
1343 if (!old)
1344 __skb_queue_tail(&r_vec->queue, skb);
1345 else
1346 __skb_queue_head(&r_vec->queue, skb);
1347 return NETDEV_TX_BUSY;
1348 }
1349
1350 if (nfp_app_ctrl_has_meta(nn->app)) {
1351 if (unlikely(skb_headroom(skb) < 8)) {
1352 nn_dp_warn(dp, "CTRL TX on skb without headroom\n");
1353 goto err_free;
1354 }
1355 metadata = NFDK_DESC_TX_CHAIN_META;
1356 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
1357 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) |
1358 FIELD_PREP(NFDK_META_FIELDS,
1359 NFP_NET_META_PORTID),
1360 skb_push(skb, 4));
1361 }
1362
1363 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
1364 goto err_free;
1365
1366 /* DMA map all */
1367 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
1368 txd = &tx_ring->ktxds[wr_idx];
1369 txbuf = &tx_ring->ktxbufs[wr_idx];
1370
1371 dma_len = skb_headlen(skb);
1372 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
1373 type = NFDK_DESC_TX_TYPE_SIMPLE;
1374 else
1375 type = NFDK_DESC_TX_TYPE_GATHER;
1376
1377 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
1378 if (dma_mapping_error(dp->dev, dma_addr))
1379 goto err_warn_dma;
1380
1381 txbuf->skb = skb;
1382 txbuf++;
1383
1384 txbuf->dma_addr = dma_addr;
1385 txbuf++;
1386
1387 dma_len -= 1;
1388 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
1389 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
1390 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
1391 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
1392
1393 txd->dma_len_type = cpu_to_le16(dlen_type);
1394 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1395
1396 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
1397 dma_len -= tmp_dlen;
1398 dma_addr += tmp_dlen + 1;
1399 txd++;
1400
1401 while (dma_len > 0) {
1402 dma_len -= 1;
1403 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
1404 txd->dma_len_type = cpu_to_le16(dlen_type);
1405 nfp_desc_set_dma_addr_48b(txd, dma_addr);
1406
1407 dlen_type &= NFDK_DESC_TX_DMA_LEN;
1408 dma_len -= dlen_type;
1409 dma_addr += dlen_type + 1;
1410 txd++;
1411 }
1412
1413 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
1414
1415 /* Metadata desc */
1416 txd->raw = cpu_to_le64(metadata);
1417 txd++;
1418
1419 cnt = txd - tx_ring->ktxds - wr_idx;
1420 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
1421 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
1422 goto err_warn_overflow;
1423
1424 tx_ring->wr_p += cnt;
1425 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
1426 tx_ring->data_pending += skb->len;
1427 else
1428 tx_ring->data_pending = 0;
1429
1430 tx_ring->wr_ptr_add += cnt;
1431 nfp_net_tx_xmit_more_flush(tx_ring);
1432
1433 return NETDEV_TX_OK;
1434
1435 err_warn_overflow:
1436 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
1437 wr_idx, skb_headlen(skb), 0, cnt);
1438 txbuf--;
1439 dma_unmap_single(dp->dev, txbuf->dma_addr,
1440 skb_headlen(skb), DMA_TO_DEVICE);
1441 txbuf->raw = 0;
1442 err_warn_dma:
1443 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
1444 err_free:
1445 u64_stats_update_begin(&r_vec->tx_sync);
1446 r_vec->tx_errors++;
1447 u64_stats_update_end(&r_vec->tx_sync);
1448 dev_kfree_skb_any(skb);
1449 return NETDEV_TX_OK;
1450 }
1451
__nfp_ctrl_tx_queued(struct nfp_net_r_vector * r_vec)1452 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)
1453 {
1454 struct sk_buff *skb;
1455
1456 while ((skb = __skb_dequeue(&r_vec->queue)))
1457 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))
1458 return;
1459 }
1460
1461 static bool
nfp_ctrl_meta_ok(struct nfp_net * nn,void * data,unsigned int meta_len)1462 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)
1463 {
1464 u32 meta_type, meta_tag;
1465
1466 if (!nfp_app_ctrl_has_meta(nn->app))
1467 return !meta_len;
1468
1469 if (meta_len != 8)
1470 return false;
1471
1472 meta_type = get_unaligned_be32(data);
1473 meta_tag = get_unaligned_be32(data + 4);
1474
1475 return (meta_type == NFP_NET_META_PORTID &&
1476 meta_tag == NFP_META_PORT_ID_CTRL);
1477 }
1478
1479 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)1480 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,
1481 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)
1482 {
1483 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1484 struct nfp_net_rx_buf *rxbuf;
1485 struct nfp_net_rx_desc *rxd;
1486 dma_addr_t new_dma_addr;
1487 struct sk_buff *skb;
1488 void *new_frag;
1489 int idx;
1490
1491 idx = D_IDX(rx_ring, rx_ring->rd_p);
1492
1493 rxd = &rx_ring->rxds[idx];
1494 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1495 return false;
1496
1497 /* Memory barrier to ensure that we won't do other reads
1498 * before the DD bit.
1499 */
1500 dma_rmb();
1501
1502 rx_ring->rd_p++;
1503
1504 rxbuf = &rx_ring->rxbufs[idx];
1505 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1506 data_len = le16_to_cpu(rxd->rxd.data_len);
1507 pkt_len = data_len - meta_len;
1508
1509 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1510 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1511 pkt_off += meta_len;
1512 else
1513 pkt_off += dp->rx_offset;
1514 meta_off = pkt_off - meta_len;
1515
1516 /* Stats update */
1517 u64_stats_update_begin(&r_vec->rx_sync);
1518 r_vec->rx_pkts++;
1519 r_vec->rx_bytes += pkt_len;
1520 u64_stats_update_end(&r_vec->rx_sync);
1521
1522 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);
1523
1524 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {
1525 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",
1526 meta_len);
1527 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1528 return true;
1529 }
1530
1531 skb = build_skb(rxbuf->frag, dp->fl_bufsz);
1532 if (unlikely(!skb)) {
1533 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1534 return true;
1535 }
1536 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
1537 if (unlikely(!new_frag)) {
1538 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1539 return true;
1540 }
1541
1542 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1543
1544 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1545
1546 skb_reserve(skb, pkt_off);
1547 skb_put(skb, pkt_len);
1548
1549 nfp_app_ctrl_rx(nn->app, skb);
1550
1551 return true;
1552 }
1553
nfp_ctrl_rx(struct nfp_net_r_vector * r_vec)1554 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)
1555 {
1556 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;
1557 struct nfp_net *nn = r_vec->nfp_net;
1558 struct nfp_net_dp *dp = &nn->dp;
1559 unsigned int budget = 512;
1560
1561 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--)
1562 continue;
1563
1564 return budget;
1565 }
1566
nfp_nfdk_ctrl_poll(struct tasklet_struct * t)1567 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t)
1568 {
1569 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet);
1570
1571 spin_lock(&r_vec->lock);
1572 nfp_nfdk_tx_complete(r_vec->tx_ring, 0);
1573 __nfp_ctrl_tx_queued(r_vec);
1574 spin_unlock(&r_vec->lock);
1575
1576 if (nfp_ctrl_rx(r_vec)) {
1577 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1578 } else {
1579 tasklet_schedule(&r_vec->tasklet);
1580 nn_dp_warn(&r_vec->nfp_net->dp,
1581 "control message budget exceeded!\n");
1582 }
1583 }
1584