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c10d12e3 JK |
1 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
2 | /* Copyright (C) 2015-2019 Netronome Systems, Inc. */ | |
3 | ||
4 | #include <linux/bpf_trace.h> | |
5 | #include <linux/netdevice.h> | |
6 | #include <linux/overflow.h> | |
7 | #include <linux/sizes.h> | |
8 | #include <linux/bitfield.h> | |
9 | ||
10 | #include "../nfp_app.h" | |
11 | #include "../nfp_net.h" | |
12 | #include "../nfp_net_dp.h" | |
13 | #include "../crypto/crypto.h" | |
14 | #include "../crypto/fw.h" | |
15 | #include "nfdk.h" | |
16 | ||
17 | static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) | |
18 | { | |
19 | return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2); | |
20 | } | |
21 | ||
22 | static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) | |
23 | { | |
24 | return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT); | |
25 | } | |
26 | ||
27 | static void nfp_nfdk_tx_ring_stop(struct netdev_queue *nd_q, | |
28 | struct nfp_net_tx_ring *tx_ring) | |
29 | { | |
30 | netif_tx_stop_queue(nd_q); | |
31 | ||
32 | /* We can race with the TX completion out of NAPI so recheck */ | |
33 | smp_mb(); | |
34 | if (unlikely(nfp_nfdk_tx_ring_should_wake(tx_ring))) | |
35 | netif_tx_start_queue(nd_q); | |
36 | } | |
37 | ||
38 | static __le64 | |
39 | nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf, | |
40 | struct sk_buff *skb) | |
41 | { | |
42 | u32 segs, hdrlen, l3_offset, l4_offset; | |
43 | struct nfp_nfdk_tx_desc txd; | |
44 | u16 mss; | |
45 | ||
46 | if (!skb->encapsulation) { | |
47 | l3_offset = skb_network_offset(skb); | |
48 | l4_offset = skb_transport_offset(skb); | |
504148fe | 49 | hdrlen = skb_tcp_all_headers(skb); |
c10d12e3 JK |
50 | } else { |
51 | l3_offset = skb_inner_network_offset(skb); | |
52 | l4_offset = skb_inner_transport_offset(skb); | |
504148fe | 53 | hdrlen = skb_inner_tcp_all_headers(skb); |
c10d12e3 JK |
54 | } |
55 | ||
56 | segs = skb_shinfo(skb)->gso_segs; | |
57 | mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK; | |
58 | ||
59 | /* Note: TSO of the packet with metadata prepended to skb is not | |
60 | * supported yet, in which case l3/l4_offset and lso_hdrlen need | |
61 | * be correctly handled here. | |
62 | * Concern: | |
63 | * The driver doesn't have md_bytes easily available at this point. | |
64 | * The PCI.IN PD ME won't have md_bytes bytes to add to lso_hdrlen, | |
65 | * so it needs the full length there. The app MEs might prefer | |
66 | * l3_offset and l4_offset relative to the start of packet data, | |
67 | * but could probably cope with it being relative to the CTM buf | |
68 | * data offset. | |
69 | */ | |
70 | txd.l3_offset = l3_offset; | |
71 | txd.l4_offset = l4_offset; | |
72 | txd.lso_meta_res = 0; | |
73 | txd.mss = cpu_to_le16(mss); | |
74 | txd.lso_hdrlen = hdrlen; | |
75 | txd.lso_totsegs = segs; | |
76 | ||
77 | txbuf->pkt_cnt = segs; | |
78 | txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1); | |
79 | ||
80 | u64_stats_update_begin(&r_vec->tx_sync); | |
81 | r_vec->tx_lso++; | |
82 | u64_stats_update_end(&r_vec->tx_sync); | |
83 | ||
84 | return txd.raw; | |
85 | } | |
86 | ||
87 | static u8 | |
88 | nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, | |
89 | unsigned int pkt_cnt, struct sk_buff *skb, u64 flags) | |
90 | { | |
91 | struct ipv6hdr *ipv6h; | |
92 | struct iphdr *iph; | |
93 | ||
94 | if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) | |
95 | return flags; | |
96 | ||
97 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
98 | return flags; | |
99 | ||
100 | flags |= NFDK_DESC_TX_L4_CSUM; | |
101 | ||
102 | iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); | |
103 | ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); | |
104 | ||
105 | /* L3 checksum offloading flag is not required for ipv6 */ | |
106 | if (iph->version == 4) { | |
107 | flags |= NFDK_DESC_TX_L3_CSUM; | |
108 | } else if (ipv6h->version != 6) { | |
109 | nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); | |
110 | return flags; | |
111 | } | |
112 | ||
113 | u64_stats_update_begin(&r_vec->tx_sync); | |
114 | if (!skb->encapsulation) { | |
115 | r_vec->hw_csum_tx += pkt_cnt; | |
116 | } else { | |
117 | flags |= NFDK_DESC_TX_ENCAP; | |
118 | r_vec->hw_csum_tx_inner += pkt_cnt; | |
119 | } | |
120 | u64_stats_update_end(&r_vec->tx_sync); | |
121 | ||
122 | return flags; | |
123 | } | |
124 | ||
125 | static int | |
126 | nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring, | |
127 | unsigned int nr_frags, struct sk_buff *skb) | |
128 | { | |
129 | unsigned int n_descs, wr_p, nop_slots; | |
130 | const skb_frag_t *frag, *fend; | |
131 | struct nfp_nfdk_tx_desc *txd; | |
132 | unsigned int wr_idx; | |
133 | int err; | |
134 | ||
135 | recount_descs: | |
136 | n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb)); | |
137 | ||
138 | frag = skb_shinfo(skb)->frags; | |
139 | fend = frag + nr_frags; | |
140 | for (; frag < fend; frag++) | |
141 | n_descs += DIV_ROUND_UP(skb_frag_size(frag), | |
142 | NFDK_TX_MAX_DATA_PER_DESC); | |
143 | ||
144 | if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) { | |
145 | if (skb_is_nonlinear(skb)) { | |
146 | err = skb_linearize(skb); | |
147 | if (err) | |
148 | return err; | |
149 | goto recount_descs; | |
150 | } | |
151 | return -EINVAL; | |
152 | } | |
153 | ||
154 | /* Under count by 1 (don't count meta) for the round down to work out */ | |
155 | n_descs += !!skb_is_gso(skb); | |
156 | ||
157 | if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != | |
158 | round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) | |
159 | goto close_block; | |
160 | ||
161 | if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK) | |
162 | goto close_block; | |
163 | ||
164 | return 0; | |
165 | ||
166 | close_block: | |
167 | wr_p = tx_ring->wr_p; | |
168 | nop_slots = D_BLOCK_CPL(wr_p); | |
169 | ||
170 | wr_idx = D_IDX(tx_ring, wr_p); | |
171 | tx_ring->ktxbufs[wr_idx].skb = NULL; | |
172 | txd = &tx_ring->ktxds[wr_idx]; | |
173 | ||
174 | memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); | |
175 | ||
176 | tx_ring->data_pending = 0; | |
177 | tx_ring->wr_p += nop_slots; | |
178 | tx_ring->wr_ptr_add += nop_slots; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int nfp_nfdk_prep_port_id(struct sk_buff *skb) | |
184 | { | |
185 | struct metadata_dst *md_dst = skb_metadata_dst(skb); | |
186 | unsigned char *data; | |
187 | ||
188 | if (likely(!md_dst)) | |
189 | return 0; | |
190 | if (unlikely(md_dst->type != METADATA_HW_PORT_MUX)) | |
191 | return 0; | |
192 | ||
193 | /* Note: Unsupported case when TSO a skb with metedata prepended. | |
194 | * See the comments in `nfp_nfdk_tx_tso` for details. | |
195 | */ | |
196 | if (unlikely(md_dst && skb_is_gso(skb))) | |
197 | return -EOPNOTSUPP; | |
198 | ||
199 | if (unlikely(skb_cow_head(skb, sizeof(md_dst->u.port_info.port_id)))) | |
200 | return -ENOMEM; | |
201 | ||
202 | data = skb_push(skb, sizeof(md_dst->u.port_info.port_id)); | |
203 | put_unaligned_be32(md_dst->u.port_info.port_id, data); | |
204 | ||
205 | return sizeof(md_dst->u.port_info.port_id); | |
206 | } | |
207 | ||
208 | static int | |
209 | nfp_nfdk_prep_tx_meta(struct nfp_app *app, struct sk_buff *skb, | |
210 | struct nfp_net_r_vector *r_vec) | |
211 | { | |
212 | unsigned char *data; | |
213 | int res, md_bytes; | |
214 | u32 meta_id = 0; | |
215 | ||
216 | res = nfp_nfdk_prep_port_id(skb); | |
217 | if (unlikely(res <= 0)) | |
218 | return res; | |
219 | ||
220 | md_bytes = res; | |
221 | meta_id = NFP_NET_META_PORTID; | |
222 | ||
223 | if (unlikely(skb_cow_head(skb, sizeof(meta_id)))) | |
224 | return -ENOMEM; | |
225 | ||
226 | md_bytes += sizeof(meta_id); | |
227 | ||
228 | meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) | | |
229 | FIELD_PREP(NFDK_META_FIELDS, meta_id); | |
230 | ||
231 | data = skb_push(skb, sizeof(meta_id)); | |
232 | put_unaligned_be32(meta_id, data); | |
233 | ||
234 | return NFDK_DESC_TX_CHAIN_META; | |
235 | } | |
236 | ||
237 | /** | |
238 | * nfp_nfdk_tx() - Main transmit entry point | |
239 | * @skb: SKB to transmit | |
240 | * @netdev: netdev structure | |
241 | * | |
242 | * Return: NETDEV_TX_OK on success. | |
243 | */ | |
244 | netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev) | |
245 | { | |
246 | struct nfp_net *nn = netdev_priv(netdev); | |
247 | struct nfp_nfdk_tx_buf *txbuf, *etxbuf; | |
248 | u32 cnt, tmp_dlen, dlen_type = 0; | |
249 | struct nfp_net_tx_ring *tx_ring; | |
250 | struct nfp_net_r_vector *r_vec; | |
251 | const skb_frag_t *frag, *fend; | |
252 | struct nfp_nfdk_tx_desc *txd; | |
253 | unsigned int real_len, qidx; | |
254 | unsigned int dma_len, type; | |
255 | struct netdev_queue *nd_q; | |
256 | struct nfp_net_dp *dp; | |
257 | int nr_frags, wr_idx; | |
258 | dma_addr_t dma_addr; | |
259 | u64 metadata; | |
260 | ||
261 | dp = &nn->dp; | |
262 | qidx = skb_get_queue_mapping(skb); | |
263 | tx_ring = &dp->tx_rings[qidx]; | |
264 | r_vec = tx_ring->r_vec; | |
265 | nd_q = netdev_get_tx_queue(dp->netdev, qidx); | |
266 | ||
267 | /* Don't bother counting frags, assume the worst */ | |
268 | if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { | |
269 | nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", | |
270 | qidx, tx_ring->wr_p, tx_ring->rd_p); | |
271 | netif_tx_stop_queue(nd_q); | |
272 | nfp_net_tx_xmit_more_flush(tx_ring); | |
273 | u64_stats_update_begin(&r_vec->tx_sync); | |
274 | r_vec->tx_busy++; | |
275 | u64_stats_update_end(&r_vec->tx_sync); | |
276 | return NETDEV_TX_BUSY; | |
277 | } | |
278 | ||
279 | metadata = nfp_nfdk_prep_tx_meta(nn->app, skb, r_vec); | |
280 | if (unlikely((int)metadata < 0)) | |
281 | goto err_flush; | |
282 | ||
283 | nr_frags = skb_shinfo(skb)->nr_frags; | |
284 | if (nfp_nfdk_tx_maybe_close_block(tx_ring, nr_frags, skb)) | |
285 | goto err_flush; | |
286 | ||
287 | /* DMA map all */ | |
288 | wr_idx = D_IDX(tx_ring, tx_ring->wr_p); | |
289 | txd = &tx_ring->ktxds[wr_idx]; | |
290 | txbuf = &tx_ring->ktxbufs[wr_idx]; | |
291 | ||
292 | dma_len = skb_headlen(skb); | |
293 | if (skb_is_gso(skb)) | |
294 | type = NFDK_DESC_TX_TYPE_TSO; | |
295 | else if (!nr_frags && dma_len < NFDK_TX_MAX_DATA_PER_HEAD) | |
296 | type = NFDK_DESC_TX_TYPE_SIMPLE; | |
297 | else | |
298 | type = NFDK_DESC_TX_TYPE_GATHER; | |
299 | ||
300 | dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); | |
301 | if (dma_mapping_error(dp->dev, dma_addr)) | |
302 | goto err_warn_dma; | |
303 | ||
304 | txbuf->skb = skb; | |
305 | txbuf++; | |
306 | ||
307 | txbuf->dma_addr = dma_addr; | |
308 | txbuf++; | |
309 | ||
310 | /* FIELD_PREP() implicitly truncates to chunk */ | |
311 | dma_len -= 1; | |
312 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | | |
313 | FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); | |
314 | ||
315 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 316 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
c10d12e3 JK |
317 | |
318 | /* starts at bit 0 */ | |
319 | BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1)); | |
320 | ||
321 | /* Preserve the original dlen_type, this way below the EOP logic | |
322 | * can use dlen_type. | |
323 | */ | |
324 | tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; | |
325 | dma_len -= tmp_dlen; | |
326 | dma_addr += tmp_dlen + 1; | |
327 | txd++; | |
328 | ||
329 | /* The rest of the data (if any) will be in larger dma descritors | |
330 | * and is handled with the fragment loop. | |
331 | */ | |
332 | frag = skb_shinfo(skb)->frags; | |
333 | fend = frag + nr_frags; | |
334 | ||
335 | while (true) { | |
336 | while (dma_len > 0) { | |
337 | dma_len -= 1; | |
338 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); | |
339 | ||
340 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 341 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
c10d12e3 JK |
342 | |
343 | dma_len -= dlen_type; | |
344 | dma_addr += dlen_type + 1; | |
345 | txd++; | |
346 | } | |
347 | ||
348 | if (frag >= fend) | |
349 | break; | |
350 | ||
351 | dma_len = skb_frag_size(frag); | |
352 | dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len, | |
353 | DMA_TO_DEVICE); | |
354 | if (dma_mapping_error(dp->dev, dma_addr)) | |
355 | goto err_unmap; | |
356 | ||
357 | txbuf->dma_addr = dma_addr; | |
358 | txbuf++; | |
359 | ||
360 | frag++; | |
361 | } | |
362 | ||
363 | (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); | |
364 | ||
365 | if (!skb_is_gso(skb)) { | |
366 | real_len = skb->len; | |
367 | /* Metadata desc */ | |
368 | metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata); | |
369 | txd->raw = cpu_to_le64(metadata); | |
370 | txd++; | |
371 | } else { | |
372 | /* lso desc should be placed after metadata desc */ | |
373 | (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb); | |
374 | real_len = txbuf->real_len; | |
375 | /* Metadata desc */ | |
376 | metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata); | |
377 | txd->raw = cpu_to_le64(metadata); | |
378 | txd += 2; | |
379 | txbuf++; | |
380 | } | |
381 | ||
382 | cnt = txd - tx_ring->ktxds - wr_idx; | |
383 | if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != | |
384 | round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) | |
385 | goto err_warn_overflow; | |
386 | ||
387 | skb_tx_timestamp(skb); | |
388 | ||
389 | tx_ring->wr_p += cnt; | |
390 | if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) | |
391 | tx_ring->data_pending += skb->len; | |
392 | else | |
393 | tx_ring->data_pending = 0; | |
394 | ||
395 | if (nfp_nfdk_tx_ring_should_stop(tx_ring)) | |
396 | nfp_nfdk_tx_ring_stop(nd_q, tx_ring); | |
397 | ||
398 | tx_ring->wr_ptr_add += cnt; | |
399 | if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more())) | |
400 | nfp_net_tx_xmit_more_flush(tx_ring); | |
401 | ||
402 | return NETDEV_TX_OK; | |
403 | ||
404 | err_warn_overflow: | |
405 | WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", | |
406 | wr_idx, skb_headlen(skb), nr_frags, cnt); | |
407 | if (skb_is_gso(skb)) | |
408 | txbuf--; | |
409 | err_unmap: | |
410 | /* txbuf pointed to the next-to-use */ | |
411 | etxbuf = txbuf; | |
412 | /* first txbuf holds the skb */ | |
413 | txbuf = &tx_ring->ktxbufs[wr_idx + 1]; | |
414 | if (txbuf < etxbuf) { | |
415 | dma_unmap_single(dp->dev, txbuf->dma_addr, | |
416 | skb_headlen(skb), DMA_TO_DEVICE); | |
417 | txbuf->raw = 0; | |
418 | txbuf++; | |
419 | } | |
420 | frag = skb_shinfo(skb)->frags; | |
421 | while (etxbuf < txbuf) { | |
422 | dma_unmap_page(dp->dev, txbuf->dma_addr, | |
423 | skb_frag_size(frag), DMA_TO_DEVICE); | |
424 | txbuf->raw = 0; | |
425 | frag++; | |
426 | txbuf++; | |
427 | } | |
428 | err_warn_dma: | |
429 | nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); | |
430 | err_flush: | |
431 | nfp_net_tx_xmit_more_flush(tx_ring); | |
432 | u64_stats_update_begin(&r_vec->tx_sync); | |
433 | r_vec->tx_errors++; | |
434 | u64_stats_update_end(&r_vec->tx_sync); | |
435 | dev_kfree_skb_any(skb); | |
436 | return NETDEV_TX_OK; | |
437 | } | |
438 | ||
439 | /** | |
440 | * nfp_nfdk_tx_complete() - Handled completed TX packets | |
441 | * @tx_ring: TX ring structure | |
442 | * @budget: NAPI budget (only used as bool to determine if in NAPI context) | |
443 | */ | |
444 | static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) | |
445 | { | |
446 | struct nfp_net_r_vector *r_vec = tx_ring->r_vec; | |
447 | struct nfp_net_dp *dp = &r_vec->nfp_net->dp; | |
448 | u32 done_pkts = 0, done_bytes = 0; | |
449 | struct nfp_nfdk_tx_buf *ktxbufs; | |
450 | struct device *dev = dp->dev; | |
451 | struct netdev_queue *nd_q; | |
452 | u32 rd_p, qcp_rd_p; | |
453 | int todo; | |
454 | ||
455 | rd_p = tx_ring->rd_p; | |
456 | if (tx_ring->wr_p == rd_p) | |
457 | return; | |
458 | ||
459 | /* Work out how many descriptors have been transmitted */ | |
460 | qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); | |
461 | ||
462 | if (qcp_rd_p == tx_ring->qcp_rd_p) | |
463 | return; | |
464 | ||
465 | todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); | |
466 | ktxbufs = tx_ring->ktxbufs; | |
467 | ||
468 | while (todo > 0) { | |
469 | const skb_frag_t *frag, *fend; | |
470 | unsigned int size, n_descs = 1; | |
471 | struct nfp_nfdk_tx_buf *txbuf; | |
472 | struct sk_buff *skb; | |
473 | ||
474 | txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)]; | |
475 | skb = txbuf->skb; | |
476 | txbuf++; | |
477 | ||
478 | /* Closed block */ | |
479 | if (!skb) { | |
480 | n_descs = D_BLOCK_CPL(rd_p); | |
481 | goto next; | |
482 | } | |
483 | ||
484 | /* Unmap head */ | |
485 | size = skb_headlen(skb); | |
486 | n_descs += nfp_nfdk_headlen_to_segs(size); | |
487 | dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE); | |
488 | txbuf++; | |
489 | ||
490 | /* Unmap frags */ | |
491 | frag = skb_shinfo(skb)->frags; | |
492 | fend = frag + skb_shinfo(skb)->nr_frags; | |
493 | for (; frag < fend; frag++) { | |
494 | size = skb_frag_size(frag); | |
495 | n_descs += DIV_ROUND_UP(size, | |
496 | NFDK_TX_MAX_DATA_PER_DESC); | |
497 | dma_unmap_page(dev, txbuf->dma_addr, | |
498 | skb_frag_size(frag), DMA_TO_DEVICE); | |
499 | txbuf++; | |
500 | } | |
501 | ||
502 | if (!skb_is_gso(skb)) { | |
503 | done_bytes += skb->len; | |
504 | done_pkts++; | |
505 | } else { | |
506 | done_bytes += txbuf->real_len; | |
507 | done_pkts += txbuf->pkt_cnt; | |
508 | n_descs++; | |
509 | } | |
510 | ||
511 | napi_consume_skb(skb, budget); | |
512 | next: | |
513 | rd_p += n_descs; | |
514 | todo -= n_descs; | |
515 | } | |
516 | ||
517 | tx_ring->rd_p = rd_p; | |
518 | tx_ring->qcp_rd_p = qcp_rd_p; | |
519 | ||
520 | u64_stats_update_begin(&r_vec->tx_sync); | |
521 | r_vec->tx_bytes += done_bytes; | |
522 | r_vec->tx_pkts += done_pkts; | |
523 | u64_stats_update_end(&r_vec->tx_sync); | |
524 | ||
525 | if (!dp->netdev) | |
526 | return; | |
527 | ||
528 | nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); | |
529 | netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); | |
530 | if (nfp_nfdk_tx_ring_should_wake(tx_ring)) { | |
531 | /* Make sure TX thread will see updated tx_ring->rd_p */ | |
532 | smp_mb(); | |
533 | ||
534 | if (unlikely(netif_tx_queue_stopped(nd_q))) | |
535 | netif_tx_wake_queue(nd_q); | |
536 | } | |
537 | ||
538 | WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, | |
539 | "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", | |
540 | tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); | |
541 | } | |
542 | ||
c10d12e3 JK |
543 | /* Receive processing */ |
544 | static void * | |
545 | nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) | |
546 | { | |
547 | void *frag; | |
548 | ||
549 | if (!dp->xdp_prog) { | |
550 | frag = napi_alloc_frag(dp->fl_bufsz); | |
551 | if (unlikely(!frag)) | |
552 | return NULL; | |
553 | } else { | |
554 | struct page *page; | |
555 | ||
556 | page = dev_alloc_page(); | |
557 | if (unlikely(!page)) | |
558 | return NULL; | |
559 | frag = page_address(page); | |
560 | } | |
561 | ||
562 | *dma_addr = nfp_net_dma_map_rx(dp, frag); | |
563 | if (dma_mapping_error(dp->dev, *dma_addr)) { | |
564 | nfp_net_free_frag(frag, dp->xdp_prog); | |
565 | nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); | |
566 | return NULL; | |
567 | } | |
568 | ||
569 | return frag; | |
570 | } | |
571 | ||
572 | /** | |
573 | * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings | |
574 | * @dp: NFP Net data path struct | |
575 | * @rx_ring: RX ring structure | |
576 | * @frag: page fragment buffer | |
577 | * @dma_addr: DMA address of skb mapping | |
578 | */ | |
579 | static void | |
580 | nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp, | |
581 | struct nfp_net_rx_ring *rx_ring, | |
582 | void *frag, dma_addr_t dma_addr) | |
583 | { | |
584 | unsigned int wr_idx; | |
585 | ||
586 | wr_idx = D_IDX(rx_ring, rx_ring->wr_p); | |
587 | ||
588 | nfp_net_dma_sync_dev_rx(dp, dma_addr); | |
589 | ||
590 | /* Stash SKB and DMA address away */ | |
591 | rx_ring->rxbufs[wr_idx].frag = frag; | |
592 | rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; | |
593 | ||
594 | /* Fill freelist descriptor */ | |
595 | rx_ring->rxds[wr_idx].fld.reserved = 0; | |
596 | rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; | |
5f30671d YZ |
597 | nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld, |
598 | dma_addr + dp->rx_dma_off); | |
c10d12e3 JK |
599 | |
600 | rx_ring->wr_p++; | |
601 | if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { | |
602 | /* Update write pointer of the freelist queue. Make | |
603 | * sure all writes are flushed before telling the hardware. | |
604 | */ | |
605 | wmb(); | |
606 | nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); | |
607 | } | |
608 | } | |
609 | ||
610 | /** | |
611 | * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW | |
612 | * @dp: NFP Net data path struct | |
613 | * @rx_ring: RX ring to fill | |
614 | */ | |
615 | void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp, | |
616 | struct nfp_net_rx_ring *rx_ring) | |
617 | { | |
618 | unsigned int i; | |
619 | ||
620 | for (i = 0; i < rx_ring->cnt - 1; i++) | |
621 | nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, | |
622 | rx_ring->rxbufs[i].dma_addr); | |
623 | } | |
624 | ||
625 | /** | |
626 | * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors | |
627 | * @flags: RX descriptor flags field in CPU byte order | |
628 | */ | |
629 | static int nfp_nfdk_rx_csum_has_errors(u16 flags) | |
630 | { | |
631 | u16 csum_all_checked, csum_all_ok; | |
632 | ||
633 | csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; | |
634 | csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; | |
635 | ||
636 | return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); | |
637 | } | |
638 | ||
639 | /** | |
640 | * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags | |
641 | * @dp: NFP Net data path struct | |
642 | * @r_vec: per-ring structure | |
643 | * @rxd: Pointer to RX descriptor | |
644 | * @meta: Parsed metadata prepend | |
645 | * @skb: Pointer to SKB | |
646 | */ | |
647 | static void | |
648 | nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, | |
649 | struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta, | |
650 | struct sk_buff *skb) | |
651 | { | |
652 | skb_checksum_none_assert(skb); | |
653 | ||
654 | if (!(dp->netdev->features & NETIF_F_RXCSUM)) | |
655 | return; | |
656 | ||
657 | if (meta->csum_type) { | |
658 | skb->ip_summed = meta->csum_type; | |
659 | skb->csum = meta->csum; | |
660 | u64_stats_update_begin(&r_vec->rx_sync); | |
661 | r_vec->hw_csum_rx_complete++; | |
662 | u64_stats_update_end(&r_vec->rx_sync); | |
663 | return; | |
664 | } | |
665 | ||
666 | if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { | |
667 | u64_stats_update_begin(&r_vec->rx_sync); | |
668 | r_vec->hw_csum_rx_error++; | |
669 | u64_stats_update_end(&r_vec->rx_sync); | |
670 | return; | |
671 | } | |
672 | ||
673 | /* Assume that the firmware will never report inner CSUM_OK unless outer | |
674 | * L4 headers were successfully parsed. FW will always report zero UDP | |
675 | * checksum as CSUM_OK. | |
676 | */ | |
677 | if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || | |
678 | rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { | |
679 | __skb_incr_checksum_unnecessary(skb); | |
680 | u64_stats_update_begin(&r_vec->rx_sync); | |
681 | r_vec->hw_csum_rx_ok++; | |
682 | u64_stats_update_end(&r_vec->rx_sync); | |
683 | } | |
684 | ||
685 | if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || | |
686 | rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { | |
687 | __skb_incr_checksum_unnecessary(skb); | |
688 | u64_stats_update_begin(&r_vec->rx_sync); | |
689 | r_vec->hw_csum_rx_inner_ok++; | |
690 | u64_stats_update_end(&r_vec->rx_sync); | |
691 | } | |
692 | } | |
693 | ||
694 | static void | |
695 | nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, | |
696 | unsigned int type, __be32 *hash) | |
697 | { | |
698 | if (!(netdev->features & NETIF_F_RXHASH)) | |
699 | return; | |
700 | ||
701 | switch (type) { | |
702 | case NFP_NET_RSS_IPV4: | |
703 | case NFP_NET_RSS_IPV6: | |
704 | case NFP_NET_RSS_IPV6_EX: | |
705 | meta->hash_type = PKT_HASH_TYPE_L3; | |
706 | break; | |
707 | default: | |
708 | meta->hash_type = PKT_HASH_TYPE_L4; | |
709 | break; | |
710 | } | |
711 | ||
712 | meta->hash = get_unaligned_be32(hash); | |
713 | } | |
714 | ||
715 | static bool | |
716 | nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, | |
717 | void *data, void *pkt, unsigned int pkt_len, int meta_len) | |
718 | { | |
719 | u32 meta_info; | |
720 | ||
721 | meta_info = get_unaligned_be32(data); | |
722 | data += 4; | |
723 | ||
724 | while (meta_info) { | |
725 | switch (meta_info & NFP_NET_META_FIELD_MASK) { | |
726 | case NFP_NET_META_HASH: | |
727 | meta_info >>= NFP_NET_META_FIELD_SIZE; | |
728 | nfp_nfdk_set_hash(netdev, meta, | |
729 | meta_info & NFP_NET_META_FIELD_MASK, | |
730 | (__be32 *)data); | |
731 | data += 4; | |
732 | break; | |
733 | case NFP_NET_META_MARK: | |
734 | meta->mark = get_unaligned_be32(data); | |
735 | data += 4; | |
736 | break; | |
737 | case NFP_NET_META_PORTID: | |
738 | meta->portid = get_unaligned_be32(data); | |
739 | data += 4; | |
740 | break; | |
741 | case NFP_NET_META_CSUM: | |
742 | meta->csum_type = CHECKSUM_COMPLETE; | |
743 | meta->csum = | |
744 | (__force __wsum)__get_unaligned_cpu32(data); | |
745 | data += 4; | |
746 | break; | |
747 | case NFP_NET_META_RESYNC_INFO: | |
748 | if (nfp_net_tls_rx_resync_req(netdev, data, pkt, | |
749 | pkt_len)) | |
750 | return false; | |
751 | data += sizeof(struct nfp_net_tls_resync_req); | |
752 | break; | |
753 | default: | |
754 | return true; | |
755 | } | |
756 | ||
757 | meta_info >>= NFP_NET_META_FIELD_SIZE; | |
758 | } | |
759 | ||
760 | return data != pkt; | |
761 | } | |
762 | ||
763 | static void | |
764 | nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, | |
765 | struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, | |
766 | struct sk_buff *skb) | |
767 | { | |
768 | u64_stats_update_begin(&r_vec->rx_sync); | |
769 | r_vec->rx_drops++; | |
770 | /* If we have both skb and rxbuf the replacement buffer allocation | |
771 | * must have failed, count this as an alloc failure. | |
772 | */ | |
773 | if (skb && rxbuf) | |
774 | r_vec->rx_replace_buf_alloc_fail++; | |
775 | u64_stats_update_end(&r_vec->rx_sync); | |
776 | ||
777 | /* skb is build based on the frag, free_skb() would free the frag | |
778 | * so to be able to reuse it we need an extra ref. | |
779 | */ | |
780 | if (skb && rxbuf && skb->head == rxbuf->frag) | |
781 | page_ref_inc(virt_to_head_page(rxbuf->frag)); | |
782 | if (rxbuf) | |
783 | nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); | |
784 | if (skb) | |
785 | dev_kfree_skb_any(skb); | |
786 | } | |
787 | ||
d9d95049 YZ |
788 | static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring) |
789 | { | |
790 | struct nfp_net_r_vector *r_vec = tx_ring->r_vec; | |
791 | struct nfp_net_dp *dp = &r_vec->nfp_net->dp; | |
792 | struct nfp_net_rx_ring *rx_ring; | |
793 | u32 qcp_rd_p, done = 0; | |
794 | bool done_all; | |
795 | int todo; | |
796 | ||
797 | /* Work out how many descriptors have been transmitted */ | |
798 | qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); | |
799 | if (qcp_rd_p == tx_ring->qcp_rd_p) | |
800 | return true; | |
801 | ||
802 | todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); | |
803 | ||
804 | done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; | |
805 | todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); | |
806 | ||
807 | rx_ring = r_vec->rx_ring; | |
808 | while (todo > 0) { | |
809 | int idx = D_IDX(tx_ring, tx_ring->rd_p + done); | |
810 | struct nfp_nfdk_tx_buf *txbuf; | |
811 | unsigned int step = 1; | |
812 | ||
813 | txbuf = &tx_ring->ktxbufs[idx]; | |
814 | if (!txbuf->raw) | |
815 | goto next; | |
816 | ||
817 | if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) { | |
818 | WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n"); | |
819 | goto next; | |
820 | } | |
821 | ||
822 | /* Two successive txbufs are used to stash virtual and dma | |
823 | * address respectively, recycle and clean them here. | |
824 | */ | |
825 | nfp_nfdk_rx_give_one(dp, rx_ring, | |
826 | (void *)NFDK_TX_BUF_PTR(txbuf[0].val), | |
827 | txbuf[1].dma_addr); | |
828 | txbuf[0].raw = 0; | |
829 | txbuf[1].raw = 0; | |
830 | step = 2; | |
831 | ||
832 | u64_stats_update_begin(&r_vec->tx_sync); | |
833 | /* Note: tx_bytes not accumulated. */ | |
834 | r_vec->tx_pkts++; | |
835 | u64_stats_update_end(&r_vec->tx_sync); | |
836 | next: | |
837 | todo -= step; | |
838 | done += step; | |
839 | } | |
840 | ||
841 | tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done); | |
842 | tx_ring->rd_p += done; | |
843 | ||
844 | WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, | |
845 | "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", | |
846 | tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); | |
847 | ||
848 | return done_all; | |
849 | } | |
850 | ||
851 | static bool | |
852 | nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, | |
853 | struct nfp_net_tx_ring *tx_ring, | |
854 | struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, | |
855 | unsigned int pkt_len, bool *completed) | |
856 | { | |
857 | unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; | |
858 | unsigned int dma_len, type, cnt, dlen_type, tmp_dlen; | |
859 | struct nfp_nfdk_tx_buf *txbuf; | |
860 | struct nfp_nfdk_tx_desc *txd; | |
861 | unsigned int n_descs; | |
862 | dma_addr_t dma_addr; | |
863 | int wr_idx; | |
864 | ||
865 | /* Reject if xdp_adjust_tail grow packet beyond DMA area */ | |
866 | if (pkt_len + dma_off > dma_map_sz) | |
867 | return false; | |
868 | ||
869 | /* Make sure there's still at least one block available after | |
870 | * aligning to block boundary, so that the txds used below | |
871 | * won't wrap around the tx_ring. | |
872 | */ | |
873 | if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { | |
874 | if (!*completed) { | |
875 | nfp_nfdk_xdp_complete(tx_ring); | |
876 | *completed = true; | |
877 | } | |
878 | ||
879 | if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { | |
880 | nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, | |
881 | NULL); | |
882 | return false; | |
883 | } | |
884 | } | |
885 | ||
886 | /* Check if cross block boundary */ | |
887 | n_descs = nfp_nfdk_headlen_to_segs(pkt_len); | |
888 | if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != | |
889 | round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) || | |
890 | ((u32)tx_ring->data_pending + pkt_len > | |
891 | NFDK_TX_MAX_DATA_PER_BLOCK)) { | |
892 | unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p); | |
893 | ||
894 | wr_idx = D_IDX(tx_ring, tx_ring->wr_p); | |
895 | txd = &tx_ring->ktxds[wr_idx]; | |
896 | memset(txd, 0, | |
897 | array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); | |
898 | ||
899 | tx_ring->data_pending = 0; | |
900 | tx_ring->wr_p += nop_slots; | |
901 | tx_ring->wr_ptr_add += nop_slots; | |
902 | } | |
903 | ||
904 | wr_idx = D_IDX(tx_ring, tx_ring->wr_p); | |
905 | ||
906 | txbuf = &tx_ring->ktxbufs[wr_idx]; | |
907 | ||
908 | txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP; | |
909 | txbuf[1].dma_addr = rxbuf->dma_addr; | |
910 | /* Note: pkt len not stored */ | |
911 | ||
912 | dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, | |
913 | pkt_len, DMA_BIDIRECTIONAL); | |
914 | ||
915 | /* Build TX descriptor */ | |
916 | txd = &tx_ring->ktxds[wr_idx]; | |
917 | dma_len = pkt_len; | |
918 | dma_addr = rxbuf->dma_addr + dma_off; | |
919 | ||
920 | if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD) | |
921 | type = NFDK_DESC_TX_TYPE_SIMPLE; | |
922 | else | |
923 | type = NFDK_DESC_TX_TYPE_GATHER; | |
924 | ||
925 | /* FIELD_PREP() implicitly truncates to chunk */ | |
926 | dma_len -= 1; | |
927 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | | |
928 | FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); | |
929 | ||
930 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 931 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
d9d95049 YZ |
932 | |
933 | tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; | |
934 | dma_len -= tmp_dlen; | |
935 | dma_addr += tmp_dlen + 1; | |
936 | txd++; | |
937 | ||
938 | while (dma_len > 0) { | |
939 | dma_len -= 1; | |
940 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); | |
941 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 942 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
d9d95049 YZ |
943 | |
944 | dlen_type &= NFDK_DESC_TX_DMA_LEN; | |
945 | dma_len -= dlen_type; | |
946 | dma_addr += dlen_type + 1; | |
947 | txd++; | |
948 | } | |
949 | ||
950 | (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); | |
951 | ||
952 | /* Metadata desc */ | |
953 | txd->raw = 0; | |
954 | txd++; | |
955 | ||
956 | cnt = txd - tx_ring->ktxds - wr_idx; | |
957 | tx_ring->wr_p += cnt; | |
958 | if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) | |
959 | tx_ring->data_pending += pkt_len; | |
960 | else | |
961 | tx_ring->data_pending = 0; | |
962 | ||
963 | tx_ring->wr_ptr_add += cnt; | |
964 | return true; | |
965 | } | |
966 | ||
c10d12e3 JK |
967 | /** |
968 | * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring | |
969 | * @rx_ring: RX ring to receive from | |
970 | * @budget: NAPI budget | |
971 | * | |
972 | * Note, this function is separated out from the napi poll function to | |
973 | * more cleanly separate packet receive code from other bookkeeping | |
974 | * functions performed in the napi poll function. | |
975 | * | |
976 | * Return: Number of packets received. | |
977 | */ | |
978 | static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget) | |
979 | { | |
980 | struct nfp_net_r_vector *r_vec = rx_ring->r_vec; | |
981 | struct nfp_net_dp *dp = &r_vec->nfp_net->dp; | |
982 | struct nfp_net_tx_ring *tx_ring; | |
983 | struct bpf_prog *xdp_prog; | |
984 | bool xdp_tx_cmpl = false; | |
985 | unsigned int true_bufsz; | |
986 | struct sk_buff *skb; | |
987 | int pkts_polled = 0; | |
988 | struct xdp_buff xdp; | |
989 | int idx; | |
990 | ||
991 | xdp_prog = READ_ONCE(dp->xdp_prog); | |
992 | true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; | |
993 | xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, | |
994 | &rx_ring->xdp_rxq); | |
995 | tx_ring = r_vec->xdp_ring; | |
996 | ||
997 | while (pkts_polled < budget) { | |
998 | unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; | |
999 | struct nfp_net_rx_buf *rxbuf; | |
1000 | struct nfp_net_rx_desc *rxd; | |
1001 | struct nfp_meta_parsed meta; | |
1002 | bool redir_egress = false; | |
1003 | struct net_device *netdev; | |
1004 | dma_addr_t new_dma_addr; | |
1005 | u32 meta_len_xdp = 0; | |
1006 | void *new_frag; | |
1007 | ||
1008 | idx = D_IDX(rx_ring, rx_ring->rd_p); | |
1009 | ||
1010 | rxd = &rx_ring->rxds[idx]; | |
1011 | if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) | |
1012 | break; | |
1013 | ||
1014 | /* Memory barrier to ensure that we won't do other reads | |
1015 | * before the DD bit. | |
1016 | */ | |
1017 | dma_rmb(); | |
1018 | ||
1019 | memset(&meta, 0, sizeof(meta)); | |
1020 | ||
1021 | rx_ring->rd_p++; | |
1022 | pkts_polled++; | |
1023 | ||
1024 | rxbuf = &rx_ring->rxbufs[idx]; | |
1025 | /* < meta_len > | |
1026 | * <-- [rx_offset] --> | |
1027 | * --------------------------------------------------------- | |
1028 | * | [XX] | metadata | packet | XXXX | | |
1029 | * --------------------------------------------------------- | |
1030 | * <---------------- data_len ---------------> | |
1031 | * | |
1032 | * The rx_offset is fixed for all packets, the meta_len can vary | |
1033 | * on a packet by packet basis. If rx_offset is set to zero | |
1034 | * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the | |
1035 | * buffer and is immediately followed by the packet (no [XX]). | |
1036 | */ | |
1037 | meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; | |
1038 | data_len = le16_to_cpu(rxd->rxd.data_len); | |
1039 | pkt_len = data_len - meta_len; | |
1040 | ||
1041 | pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; | |
1042 | if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) | |
1043 | pkt_off += meta_len; | |
1044 | else | |
1045 | pkt_off += dp->rx_offset; | |
1046 | meta_off = pkt_off - meta_len; | |
1047 | ||
1048 | /* Stats update */ | |
1049 | u64_stats_update_begin(&r_vec->rx_sync); | |
1050 | r_vec->rx_pkts++; | |
1051 | r_vec->rx_bytes += pkt_len; | |
1052 | u64_stats_update_end(&r_vec->rx_sync); | |
1053 | ||
1054 | if (unlikely(meta_len > NFP_NET_MAX_PREPEND || | |
1055 | (dp->rx_offset && meta_len > dp->rx_offset))) { | |
1056 | nn_dp_warn(dp, "oversized RX packet metadata %u\n", | |
1057 | meta_len); | |
1058 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); | |
1059 | continue; | |
1060 | } | |
1061 | ||
1062 | nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, | |
1063 | data_len); | |
1064 | ||
1065 | if (meta_len) { | |
1066 | if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta, | |
1067 | rxbuf->frag + meta_off, | |
1068 | rxbuf->frag + pkt_off, | |
1069 | pkt_len, meta_len))) { | |
1070 | nn_dp_warn(dp, "invalid RX packet metadata\n"); | |
1071 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, | |
1072 | NULL); | |
1073 | continue; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (xdp_prog && !meta.portid) { | |
1078 | void *orig_data = rxbuf->frag + pkt_off; | |
d9d95049 | 1079 | unsigned int dma_off; |
c10d12e3 JK |
1080 | int act; |
1081 | ||
1082 | xdp_prepare_buff(&xdp, | |
1083 | rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, | |
1084 | pkt_off - NFP_NET_RX_BUF_HEADROOM, | |
1085 | pkt_len, true); | |
1086 | ||
1087 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
1088 | ||
1089 | pkt_len = xdp.data_end - xdp.data; | |
1090 | pkt_off += xdp.data - orig_data; | |
1091 | ||
1092 | switch (act) { | |
1093 | case XDP_PASS: | |
1094 | meta_len_xdp = xdp.data - xdp.data_meta; | |
1095 | break; | |
d9d95049 YZ |
1096 | case XDP_TX: |
1097 | dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; | |
1098 | if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring, | |
1099 | tx_ring, | |
1100 | rxbuf, | |
1101 | dma_off, | |
1102 | pkt_len, | |
1103 | &xdp_tx_cmpl))) | |
1104 | trace_xdp_exception(dp->netdev, | |
1105 | xdp_prog, act); | |
1106 | continue; | |
c10d12e3 JK |
1107 | default: |
1108 | bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act); | |
1109 | fallthrough; | |
1110 | case XDP_ABORTED: | |
1111 | trace_xdp_exception(dp->netdev, xdp_prog, act); | |
1112 | fallthrough; | |
1113 | case XDP_DROP: | |
1114 | nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, | |
1115 | rxbuf->dma_addr); | |
1116 | continue; | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | if (likely(!meta.portid)) { | |
1121 | netdev = dp->netdev; | |
1122 | } else if (meta.portid == NFP_META_PORT_ID_CTRL) { | |
1123 | struct nfp_net *nn = netdev_priv(dp->netdev); | |
1124 | ||
1125 | nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, | |
1126 | pkt_len); | |
1127 | nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, | |
1128 | rxbuf->dma_addr); | |
1129 | continue; | |
1130 | } else { | |
1131 | struct nfp_net *nn; | |
1132 | ||
1133 | nn = netdev_priv(dp->netdev); | |
1134 | netdev = nfp_app_dev_get(nn->app, meta.portid, | |
1135 | &redir_egress); | |
1136 | if (unlikely(!netdev)) { | |
1137 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, | |
1138 | NULL); | |
1139 | continue; | |
1140 | } | |
1141 | ||
1142 | if (nfp_netdev_is_nfp_repr(netdev)) | |
1143 | nfp_repr_inc_rx_stats(netdev, pkt_len); | |
1144 | } | |
1145 | ||
1146 | skb = build_skb(rxbuf->frag, true_bufsz); | |
1147 | if (unlikely(!skb)) { | |
1148 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); | |
1149 | continue; | |
1150 | } | |
1151 | new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); | |
1152 | if (unlikely(!new_frag)) { | |
1153 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); | |
1154 | continue; | |
1155 | } | |
1156 | ||
1157 | nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); | |
1158 | ||
1159 | nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); | |
1160 | ||
1161 | skb_reserve(skb, pkt_off); | |
1162 | skb_put(skb, pkt_len); | |
1163 | ||
1164 | skb->mark = meta.mark; | |
1165 | skb_set_hash(skb, meta.hash, meta.hash_type); | |
1166 | ||
1167 | skb_record_rx_queue(skb, rx_ring->idx); | |
1168 | skb->protocol = eth_type_trans(skb, netdev); | |
1169 | ||
1170 | nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb); | |
1171 | ||
1172 | if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) | |
1173 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), | |
1174 | le16_to_cpu(rxd->rxd.vlan)); | |
1175 | if (meta_len_xdp) | |
1176 | skb_metadata_set(skb, meta_len_xdp); | |
1177 | ||
1178 | if (likely(!redir_egress)) { | |
1179 | napi_gro_receive(&rx_ring->r_vec->napi, skb); | |
1180 | } else { | |
1181 | skb->dev = netdev; | |
1182 | skb_reset_network_header(skb); | |
1183 | __skb_push(skb, ETH_HLEN); | |
1184 | dev_queue_xmit(skb); | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | if (xdp_prog) { | |
1189 | if (tx_ring->wr_ptr_add) | |
1190 | nfp_net_tx_xmit_more_flush(tx_ring); | |
1191 | else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && | |
1192 | !xdp_tx_cmpl) | |
1193 | if (!nfp_nfdk_xdp_complete(tx_ring)) | |
1194 | pkts_polled = budget; | |
1195 | } | |
1196 | ||
1197 | return pkts_polled; | |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * nfp_nfdk_poll() - napi poll function | |
1202 | * @napi: NAPI structure | |
1203 | * @budget: NAPI budget | |
1204 | * | |
1205 | * Return: number of packets polled. | |
1206 | */ | |
1207 | int nfp_nfdk_poll(struct napi_struct *napi, int budget) | |
1208 | { | |
1209 | struct nfp_net_r_vector *r_vec = | |
1210 | container_of(napi, struct nfp_net_r_vector, napi); | |
1211 | unsigned int pkts_polled = 0; | |
1212 | ||
1213 | if (r_vec->tx_ring) | |
1214 | nfp_nfdk_tx_complete(r_vec->tx_ring, budget); | |
1215 | if (r_vec->rx_ring) | |
1216 | pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget); | |
1217 | ||
1218 | if (pkts_polled < budget) | |
1219 | if (napi_complete_done(napi, pkts_polled)) | |
1220 | nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); | |
1221 | ||
1222 | if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) { | |
1223 | struct dim_sample dim_sample = {}; | |
1224 | unsigned int start; | |
1225 | u64 pkts, bytes; | |
1226 | ||
1227 | do { | |
1228 | start = u64_stats_fetch_begin(&r_vec->rx_sync); | |
1229 | pkts = r_vec->rx_pkts; | |
1230 | bytes = r_vec->rx_bytes; | |
1231 | } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); | |
1232 | ||
1233 | dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); | |
1234 | net_dim(&r_vec->rx_dim, dim_sample); | |
1235 | } | |
1236 | ||
1237 | if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) { | |
1238 | struct dim_sample dim_sample = {}; | |
1239 | unsigned int start; | |
1240 | u64 pkts, bytes; | |
1241 | ||
1242 | do { | |
1243 | start = u64_stats_fetch_begin(&r_vec->tx_sync); | |
1244 | pkts = r_vec->tx_pkts; | |
1245 | bytes = r_vec->tx_bytes; | |
1246 | } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); | |
1247 | ||
1248 | dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); | |
1249 | net_dim(&r_vec->tx_dim, dim_sample); | |
1250 | } | |
1251 | ||
1252 | return pkts_polled; | |
1253 | } | |
1254 | ||
1255 | /* Control device data path | |
1256 | */ | |
1257 | ||
1258 | bool | |
1259 | nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, | |
1260 | struct sk_buff *skb, bool old) | |
1261 | { | |
1262 | u32 cnt, tmp_dlen, dlen_type = 0; | |
1263 | struct nfp_net_tx_ring *tx_ring; | |
1264 | struct nfp_nfdk_tx_buf *txbuf; | |
1265 | struct nfp_nfdk_tx_desc *txd; | |
1266 | unsigned int dma_len, type; | |
1267 | struct nfp_net_dp *dp; | |
1268 | dma_addr_t dma_addr; | |
1269 | u64 metadata = 0; | |
1270 | int wr_idx; | |
1271 | ||
1272 | dp = &r_vec->nfp_net->dp; | |
1273 | tx_ring = r_vec->tx_ring; | |
1274 | ||
1275 | if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { | |
1276 | nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); | |
1277 | goto err_free; | |
1278 | } | |
1279 | ||
1280 | /* Don't bother counting frags, assume the worst */ | |
1281 | if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { | |
1282 | u64_stats_update_begin(&r_vec->tx_sync); | |
1283 | r_vec->tx_busy++; | |
1284 | u64_stats_update_end(&r_vec->tx_sync); | |
1285 | if (!old) | |
1286 | __skb_queue_tail(&r_vec->queue, skb); | |
1287 | else | |
1288 | __skb_queue_head(&r_vec->queue, skb); | |
1289 | return NETDEV_TX_BUSY; | |
1290 | } | |
1291 | ||
1292 | if (nfp_app_ctrl_has_meta(nn->app)) { | |
1293 | if (unlikely(skb_headroom(skb) < 8)) { | |
1294 | nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); | |
1295 | goto err_free; | |
1296 | } | |
1297 | metadata = NFDK_DESC_TX_CHAIN_META; | |
1298 | put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); | |
1299 | put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) | | |
1300 | FIELD_PREP(NFDK_META_FIELDS, | |
1301 | NFP_NET_META_PORTID), | |
1302 | skb_push(skb, 4)); | |
1303 | } | |
1304 | ||
1305 | if (nfp_nfdk_tx_maybe_close_block(tx_ring, 0, skb)) | |
1306 | goto err_free; | |
1307 | ||
1308 | /* DMA map all */ | |
1309 | wr_idx = D_IDX(tx_ring, tx_ring->wr_p); | |
1310 | txd = &tx_ring->ktxds[wr_idx]; | |
1311 | txbuf = &tx_ring->ktxbufs[wr_idx]; | |
1312 | ||
1313 | dma_len = skb_headlen(skb); | |
1314 | if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD) | |
1315 | type = NFDK_DESC_TX_TYPE_SIMPLE; | |
1316 | else | |
1317 | type = NFDK_DESC_TX_TYPE_GATHER; | |
1318 | ||
1319 | dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); | |
1320 | if (dma_mapping_error(dp->dev, dma_addr)) | |
1321 | goto err_warn_dma; | |
1322 | ||
1323 | txbuf->skb = skb; | |
1324 | txbuf++; | |
1325 | ||
1326 | txbuf->dma_addr = dma_addr; | |
1327 | txbuf++; | |
1328 | ||
1329 | dma_len -= 1; | |
1330 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | | |
1331 | FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); | |
1332 | ||
1333 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 1334 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
c10d12e3 JK |
1335 | |
1336 | tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; | |
1337 | dma_len -= tmp_dlen; | |
1338 | dma_addr += tmp_dlen + 1; | |
1339 | txd++; | |
1340 | ||
1341 | while (dma_len > 0) { | |
1342 | dma_len -= 1; | |
1343 | dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); | |
1344 | txd->dma_len_type = cpu_to_le16(dlen_type); | |
5f30671d | 1345 | nfp_desc_set_dma_addr_48b(txd, dma_addr); |
c10d12e3 JK |
1346 | |
1347 | dlen_type &= NFDK_DESC_TX_DMA_LEN; | |
1348 | dma_len -= dlen_type; | |
1349 | dma_addr += dlen_type + 1; | |
1350 | txd++; | |
1351 | } | |
1352 | ||
1353 | (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); | |
1354 | ||
1355 | /* Metadata desc */ | |
1356 | txd->raw = cpu_to_le64(metadata); | |
1357 | txd++; | |
1358 | ||
1359 | cnt = txd - tx_ring->ktxds - wr_idx; | |
1360 | if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != | |
1361 | round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) | |
1362 | goto err_warn_overflow; | |
1363 | ||
1364 | tx_ring->wr_p += cnt; | |
1365 | if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) | |
1366 | tx_ring->data_pending += skb->len; | |
1367 | else | |
1368 | tx_ring->data_pending = 0; | |
1369 | ||
1370 | tx_ring->wr_ptr_add += cnt; | |
1371 | nfp_net_tx_xmit_more_flush(tx_ring); | |
1372 | ||
1373 | return NETDEV_TX_OK; | |
1374 | ||
1375 | err_warn_overflow: | |
1376 | WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", | |
1377 | wr_idx, skb_headlen(skb), 0, cnt); | |
1378 | txbuf--; | |
1379 | dma_unmap_single(dp->dev, txbuf->dma_addr, | |
1380 | skb_headlen(skb), DMA_TO_DEVICE); | |
1381 | txbuf->raw = 0; | |
1382 | err_warn_dma: | |
1383 | nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); | |
1384 | err_free: | |
1385 | u64_stats_update_begin(&r_vec->tx_sync); | |
1386 | r_vec->tx_errors++; | |
1387 | u64_stats_update_end(&r_vec->tx_sync); | |
1388 | dev_kfree_skb_any(skb); | |
1389 | return NETDEV_TX_OK; | |
1390 | } | |
1391 | ||
1392 | static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) | |
1393 | { | |
1394 | struct sk_buff *skb; | |
1395 | ||
1396 | while ((skb = __skb_dequeue(&r_vec->queue))) | |
1397 | if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) | |
1398 | return; | |
1399 | } | |
1400 | ||
1401 | static bool | |
1402 | nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) | |
1403 | { | |
1404 | u32 meta_type, meta_tag; | |
1405 | ||
1406 | if (!nfp_app_ctrl_has_meta(nn->app)) | |
1407 | return !meta_len; | |
1408 | ||
1409 | if (meta_len != 8) | |
1410 | return false; | |
1411 | ||
1412 | meta_type = get_unaligned_be32(data); | |
1413 | meta_tag = get_unaligned_be32(data + 4); | |
1414 | ||
1415 | return (meta_type == NFP_NET_META_PORTID && | |
1416 | meta_tag == NFP_META_PORT_ID_CTRL); | |
1417 | } | |
1418 | ||
1419 | static bool | |
1420 | nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, | |
1421 | struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) | |
1422 | { | |
1423 | unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; | |
1424 | struct nfp_net_rx_buf *rxbuf; | |
1425 | struct nfp_net_rx_desc *rxd; | |
1426 | dma_addr_t new_dma_addr; | |
1427 | struct sk_buff *skb; | |
1428 | void *new_frag; | |
1429 | int idx; | |
1430 | ||
1431 | idx = D_IDX(rx_ring, rx_ring->rd_p); | |
1432 | ||
1433 | rxd = &rx_ring->rxds[idx]; | |
1434 | if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) | |
1435 | return false; | |
1436 | ||
1437 | /* Memory barrier to ensure that we won't do other reads | |
1438 | * before the DD bit. | |
1439 | */ | |
1440 | dma_rmb(); | |
1441 | ||
1442 | rx_ring->rd_p++; | |
1443 | ||
1444 | rxbuf = &rx_ring->rxbufs[idx]; | |
1445 | meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; | |
1446 | data_len = le16_to_cpu(rxd->rxd.data_len); | |
1447 | pkt_len = data_len - meta_len; | |
1448 | ||
1449 | pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; | |
1450 | if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) | |
1451 | pkt_off += meta_len; | |
1452 | else | |
1453 | pkt_off += dp->rx_offset; | |
1454 | meta_off = pkt_off - meta_len; | |
1455 | ||
1456 | /* Stats update */ | |
1457 | u64_stats_update_begin(&r_vec->rx_sync); | |
1458 | r_vec->rx_pkts++; | |
1459 | r_vec->rx_bytes += pkt_len; | |
1460 | u64_stats_update_end(&r_vec->rx_sync); | |
1461 | ||
1462 | nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); | |
1463 | ||
1464 | if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { | |
1465 | nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", | |
1466 | meta_len); | |
1467 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); | |
1468 | return true; | |
1469 | } | |
1470 | ||
1471 | skb = build_skb(rxbuf->frag, dp->fl_bufsz); | |
1472 | if (unlikely(!skb)) { | |
1473 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); | |
1474 | return true; | |
1475 | } | |
1476 | new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); | |
1477 | if (unlikely(!new_frag)) { | |
1478 | nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); | |
1479 | return true; | |
1480 | } | |
1481 | ||
1482 | nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); | |
1483 | ||
1484 | nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); | |
1485 | ||
1486 | skb_reserve(skb, pkt_off); | |
1487 | skb_put(skb, pkt_len); | |
1488 | ||
1489 | nfp_app_ctrl_rx(nn->app, skb); | |
1490 | ||
1491 | return true; | |
1492 | } | |
1493 | ||
1494 | static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) | |
1495 | { | |
1496 | struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; | |
1497 | struct nfp_net *nn = r_vec->nfp_net; | |
1498 | struct nfp_net_dp *dp = &nn->dp; | |
1499 | unsigned int budget = 512; | |
1500 | ||
1501 | while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) | |
1502 | continue; | |
1503 | ||
1504 | return budget; | |
1505 | } | |
1506 | ||
1507 | void nfp_nfdk_ctrl_poll(struct tasklet_struct *t) | |
1508 | { | |
1509 | struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); | |
1510 | ||
1511 | spin_lock(&r_vec->lock); | |
1512 | nfp_nfdk_tx_complete(r_vec->tx_ring, 0); | |
1513 | __nfp_ctrl_tx_queued(r_vec); | |
1514 | spin_unlock(&r_vec->lock); | |
1515 | ||
1516 | if (nfp_ctrl_rx(r_vec)) { | |
1517 | nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); | |
1518 | } else { | |
1519 | tasklet_schedule(&r_vec->tasklet); | |
1520 | nn_dp_warn(&r_vec->nfp_net->dp, | |
1521 | "control message budget exceeded!\n"); | |
1522 | } | |
1523 | } |