]> git.proxmox.com Git - ceph.git/blob - ceph/src/dpdk/drivers/net/virtio/virtio_rxtx.c
projects / ceph.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
add subtree-ish sources for 12.0.3
[ceph.git] / ceph / src / dpdk / drivers / net / virtio / virtio_rxtx.c
1 /*-
2 * BSD LICENSE
3 *
4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <stdint.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <errno.h>
39
40 #include <rte_cycles.h>
41 #include <rte_memory.h>
42 #include <rte_memzone.h>
43 #include <rte_branch_prediction.h>
44 #include <rte_mempool.h>
45 #include <rte_malloc.h>
46 #include <rte_mbuf.h>
47 #include <rte_ether.h>
48 #include <rte_ethdev.h>
49 #include <rte_prefetch.h>
50 #include <rte_string_fns.h>
51 #include <rte_errno.h>
52 #include <rte_byteorder.h>
53 #include <rte_cpuflags.h>
54 #include <rte_net.h>
55 #include <rte_ip.h>
56 #include <rte_udp.h>
57 #include <rte_tcp.h>
58
59 #include "virtio_logs.h"
60 #include "virtio_ethdev.h"
61 #include "virtio_pci.h"
62 #include "virtqueue.h"
63 #include "virtio_rxtx.h"
64
65 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
66 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
67 #else
68 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
69 #endif
70
71
72 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
73 ETH_TXQ_FLAGS_NOOFFLOADS)
74
75 static void
76 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
77 {
78 struct vring_desc *dp, *dp_tail;
79 struct vq_desc_extra *dxp;
80 uint16_t desc_idx_last = desc_idx;
81
82 dp = &vq->vq_ring.desc[desc_idx];
83 dxp = &vq->vq_descx[desc_idx];
84 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
85 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
86 while (dp->flags & VRING_DESC_F_NEXT) {
87 desc_idx_last = dp->next;
88 dp = &vq->vq_ring.desc[dp->next];
89 }
90 }
91 dxp->ndescs = 0;
92
93 /*
94 * We must append the existing free chain, if any, to the end of
95 * newly freed chain. If the virtqueue was completely used, then
96 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
97 */
98 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
99 vq->vq_desc_head_idx = desc_idx;
100 } else {
101 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
102 dp_tail->next = desc_idx;
103 }
104
105 vq->vq_desc_tail_idx = desc_idx_last;
106 dp->next = VQ_RING_DESC_CHAIN_END;
107 }
108
109 static uint16_t
110 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
111 uint32_t *len, uint16_t num)
112 {
113 struct vring_used_elem *uep;
114 struct rte_mbuf *cookie;
115 uint16_t used_idx, desc_idx;
116 uint16_t i;
117
118 /* Caller does the check */
119 for (i = 0; i < num ; i++) {
120 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
121 uep = &vq->vq_ring.used->ring[used_idx];
122 desc_idx = (uint16_t) uep->id;
123 len[i] = uep->len;
124 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
125
126 if (unlikely(cookie == NULL)) {
127 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
128 vq->vq_used_cons_idx);
129 break;
130 }
131
132 rte_prefetch0(cookie);
133 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
134 rx_pkts[i] = cookie;
135 vq->vq_used_cons_idx++;
136 vq_ring_free_chain(vq, desc_idx);
137 vq->vq_descx[desc_idx].cookie = NULL;
138 }
139
140 return i;
141 }
142
143 #ifndef DEFAULT_TX_FREE_THRESH
144 #define DEFAULT_TX_FREE_THRESH 32
145 #endif
146
147 /* Cleanup from completed transmits. */
148 static void
149 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
150 {
151 uint16_t i, used_idx, desc_idx;
152 for (i = 0; i < num; i++) {
153 struct vring_used_elem *uep;
154 struct vq_desc_extra *dxp;
155
156 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
157 uep = &vq->vq_ring.used->ring[used_idx];
158
159 desc_idx = (uint16_t) uep->id;
160 dxp = &vq->vq_descx[desc_idx];
161 vq->vq_used_cons_idx++;
162 vq_ring_free_chain(vq, desc_idx);
163
164 if (dxp->cookie != NULL) {
165 rte_pktmbuf_free(dxp->cookie);
166 dxp->cookie = NULL;
167 }
168 }
169 }
170
171
172 static inline int
173 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
174 {
175 struct vq_desc_extra *dxp;
176 struct virtio_hw *hw = vq->hw;
177 struct vring_desc *start_dp;
178 uint16_t needed = 1;
179 uint16_t head_idx, idx;
180
181 if (unlikely(vq->vq_free_cnt == 0))
182 return -ENOSPC;
183 if (unlikely(vq->vq_free_cnt < needed))
184 return -EMSGSIZE;
185
186 head_idx = vq->vq_desc_head_idx;
187 if (unlikely(head_idx >= vq->vq_nentries))
188 return -EFAULT;
189
190 idx = head_idx;
191 dxp = &vq->vq_descx[idx];
192 dxp->cookie = (void *)cookie;
193 dxp->ndescs = needed;
194
195 start_dp = vq->vq_ring.desc;
196 start_dp[idx].addr =
197 VIRTIO_MBUF_ADDR(cookie, vq) +
198 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
199 start_dp[idx].len =
200 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
201 start_dp[idx].flags = VRING_DESC_F_WRITE;
202 idx = start_dp[idx].next;
203 vq->vq_desc_head_idx = idx;
204 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
205 vq->vq_desc_tail_idx = idx;
206 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
207 vq_update_avail_ring(vq, head_idx);
208
209 return 0;
210 }
211
212 /* When doing TSO, the IP length is not included in the pseudo header
213 * checksum of the packet given to the PMD, but for virtio it is
214 * expected.
215 */
216 static void
217 virtio_tso_fix_cksum(struct rte_mbuf *m)
218 {
219 /* common case: header is not fragmented */
220 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
221 m->l4_len)) {
222 struct ipv4_hdr *iph;
223 struct ipv6_hdr *ip6h;
224 struct tcp_hdr *th;
225 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
226 uint32_t tmp;
227
228 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
229 th = RTE_PTR_ADD(iph, m->l3_len);
230 if ((iph->version_ihl >> 4) == 4) {
231 iph->hdr_checksum = 0;
232 iph->hdr_checksum = rte_ipv4_cksum(iph);
233 ip_len = iph->total_length;
234 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
235 m->l3_len);
236 } else {
237 ip6h = (struct ipv6_hdr *)iph;
238 ip_paylen = ip6h->payload_len;
239 }
240
241 /* calculate the new phdr checksum not including ip_paylen */
242 prev_cksum = th->cksum;
243 tmp = prev_cksum;
244 tmp += ip_paylen;
245 tmp = (tmp & 0xffff) + (tmp >> 16);
246 new_cksum = tmp;
247
248 /* replace it in the packet */
249 th->cksum = new_cksum;
250 }
251 }
252
253 static inline int
254 tx_offload_enabled(struct virtio_hw *hw)
255 {
256 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
257 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
258 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
259 }
260
261 static inline void
262 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
263 uint16_t needed, int use_indirect, int can_push)
264 {
265 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
266 struct vq_desc_extra *dxp;
267 struct virtqueue *vq = txvq->vq;
268 struct vring_desc *start_dp;
269 uint16_t seg_num = cookie->nb_segs;
270 uint16_t head_idx, idx;
271 uint16_t head_size = vq->hw->vtnet_hdr_size;
272 struct virtio_net_hdr *hdr;
273 int offload;
274
275 offload = tx_offload_enabled(vq->hw);
276 head_idx = vq->vq_desc_head_idx;
277 idx = head_idx;
278 dxp = &vq->vq_descx[idx];
279 dxp->cookie = (void *)cookie;
280 dxp->ndescs = needed;
281
282 start_dp = vq->vq_ring.desc;
283
284 if (can_push) {
285 /* prepend cannot fail, checked by caller */
286 hdr = (struct virtio_net_hdr *)
287 rte_pktmbuf_prepend(cookie, head_size);
288 /* if offload disabled, it is not zeroed below, do it now */
289 if (offload == 0)
290 memset(hdr, 0, head_size);
291 } else if (use_indirect) {
292 /* setup tx ring slot to point to indirect
293 * descriptor list stored in reserved region.
294 *
295 * the first slot in indirect ring is already preset
296 * to point to the header in reserved region
297 */
298 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
299 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
300 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
301 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
302 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
303
304 /* loop below will fill in rest of the indirect elements */
305 start_dp = txr[idx].tx_indir;
306 idx = 1;
307 } else {
308 /* setup first tx ring slot to point to header
309 * stored in reserved region.
310 */
311 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
312 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
313 start_dp[idx].len = vq->hw->vtnet_hdr_size;
314 start_dp[idx].flags = VRING_DESC_F_NEXT;
315 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
316
317 idx = start_dp[idx].next;
318 }
319
320 /* Checksum Offload / TSO */
321 if (offload) {
322 if (cookie->ol_flags & PKT_TX_TCP_SEG)
323 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
324
325 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
326 case PKT_TX_UDP_CKSUM:
327 hdr->csum_start = cookie->l2_len + cookie->l3_len;
328 hdr->csum_offset = offsetof(struct udp_hdr,
329 dgram_cksum);
330 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
331 break;
332
333 case PKT_TX_TCP_CKSUM:
334 hdr->csum_start = cookie->l2_len + cookie->l3_len;
335 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
336 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
337 break;
338
339 default:
340 hdr->csum_start = 0;
341 hdr->csum_offset = 0;
342 hdr->flags = 0;
343 break;
344 }
345
346 /* TCP Segmentation Offload */
347 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
348 virtio_tso_fix_cksum(cookie);
349 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
350 VIRTIO_NET_HDR_GSO_TCPV6 :
351 VIRTIO_NET_HDR_GSO_TCPV4;
352 hdr->gso_size = cookie->tso_segsz;
353 hdr->hdr_len =
354 cookie->l2_len +
355 cookie->l3_len +
356 cookie->l4_len;
357 } else {
358 hdr->gso_type = 0;
359 hdr->gso_size = 0;
360 hdr->hdr_len = 0;
361 }
362 }
363
364 do {
365 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
366 start_dp[idx].len = cookie->data_len;
367 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
368 idx = start_dp[idx].next;
369 } while ((cookie = cookie->next) != NULL);
370
371 if (use_indirect)
372 idx = vq->vq_ring.desc[head_idx].next;
373
374 vq->vq_desc_head_idx = idx;
375 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
376 vq->vq_desc_tail_idx = idx;
377 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
378 vq_update_avail_ring(vq, head_idx);
379 }
380
381 void
382 virtio_dev_cq_start(struct rte_eth_dev *dev)
383 {
384 struct virtio_hw *hw = dev->data->dev_private;
385
386 if (hw->cvq && hw->cvq->vq) {
387 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
388 }
389 }
390
391 int
392 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
393 uint16_t queue_idx,
394 uint16_t nb_desc,
395 unsigned int socket_id __rte_unused,
396 __rte_unused const struct rte_eth_rxconf *rx_conf,
397 struct rte_mempool *mp)
398 {
399 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
400 struct virtio_hw *hw = dev->data->dev_private;
401 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
402 struct virtnet_rx *rxvq;
403 int error, nbufs;
404 struct rte_mbuf *m;
405 uint16_t desc_idx;
406
407 PMD_INIT_FUNC_TRACE();
408
409 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
410 nb_desc = vq->vq_nentries;
411 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
412
413 rxvq = &vq->rxq;
414 rxvq->queue_id = queue_idx;
415 rxvq->mpool = mp;
416 if (rxvq->mpool == NULL) {
417 rte_exit(EXIT_FAILURE,
418 "Cannot allocate mbufs for rx virtqueue");
419 }
420 dev->data->rx_queues[queue_idx] = rxvq;
421
422
423 /* Allocate blank mbufs for the each rx descriptor */
424 nbufs = 0;
425 error = ENOSPC;
426
427 if (hw->use_simple_rxtx) {
428 for (desc_idx = 0; desc_idx < vq->vq_nentries;
429 desc_idx++) {
430 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
431 vq->vq_ring.desc[desc_idx].flags =
432 VRING_DESC_F_WRITE;
433 }
434 }
435
436 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
437 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
438 desc_idx++) {
439 vq->sw_ring[vq->vq_nentries + desc_idx] =
440 &rxvq->fake_mbuf;
441 }
442
443 while (!virtqueue_full(vq)) {
444 m = rte_mbuf_raw_alloc(rxvq->mpool);
445 if (m == NULL)
446 break;
447
448 /* Enqueue allocated buffers */
449 if (hw->use_simple_rxtx)
450 error = virtqueue_enqueue_recv_refill_simple(vq, m);
451 else
452 error = virtqueue_enqueue_recv_refill(vq, m);
453
454 if (error) {
455 rte_pktmbuf_free(m);
456 break;
457 }
458 nbufs++;
459 }
460
461 vq_update_avail_idx(vq);
462
463 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
464
465 virtio_rxq_vec_setup(rxvq);
466
467 VIRTQUEUE_DUMP(vq);
468
469 return 0;
470 }
471
472 static void
473 virtio_update_rxtx_handler(struct rte_eth_dev *dev,
474 const struct rte_eth_txconf *tx_conf)
475 {
476 uint8_t use_simple_rxtx = 0;
477 struct virtio_hw *hw = dev->data->dev_private;
478
479 #if defined RTE_ARCH_X86
480 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3))
481 use_simple_rxtx = 1;
482 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
483 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
484 use_simple_rxtx = 1;
485 #endif
486 /* Use simple rx/tx func if single segment and no offloads */
487 if (use_simple_rxtx &&
488 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
489 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
490 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
491 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
492 dev->rx_pkt_burst = virtio_recv_pkts_vec;
493 hw->use_simple_rxtx = use_simple_rxtx;
494 }
495 }
496
497 /*
498 * struct rte_eth_dev *dev: Used to update dev
499 * uint16_t nb_desc: Defaults to values read from config space
500 * unsigned int socket_id: Used to allocate memzone
501 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
502 * uint16_t queue_idx: Just used as an index in dev txq list
503 */
504 int
505 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
506 uint16_t queue_idx,
507 uint16_t nb_desc,
508 unsigned int socket_id __rte_unused,
509 const struct rte_eth_txconf *tx_conf)
510 {
511 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
512 struct virtio_hw *hw = dev->data->dev_private;
513 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
514 struct virtnet_tx *txvq;
515 uint16_t tx_free_thresh;
516 uint16_t desc_idx;
517
518 PMD_INIT_FUNC_TRACE();
519
520 virtio_update_rxtx_handler(dev, tx_conf);
521
522 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
523 nb_desc = vq->vq_nentries;
524 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
525
526 txvq = &vq->txq;
527 txvq->queue_id = queue_idx;
528
529 tx_free_thresh = tx_conf->tx_free_thresh;
530 if (tx_free_thresh == 0)
531 tx_free_thresh =
532 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
533
534 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
535 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
536 "number of TX entries minus 3 (%u)."
537 " (tx_free_thresh=%u port=%u queue=%u)\n",
538 vq->vq_nentries - 3,
539 tx_free_thresh, dev->data->port_id, queue_idx);
540 return -EINVAL;
541 }
542
543 vq->vq_free_thresh = tx_free_thresh;
544
545 if (hw->use_simple_rxtx) {
546 uint16_t mid_idx = vq->vq_nentries >> 1;
547
548 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
549 vq->vq_ring.avail->ring[desc_idx] =
550 desc_idx + mid_idx;
551 vq->vq_ring.desc[desc_idx + mid_idx].next =
552 desc_idx;
553 vq->vq_ring.desc[desc_idx + mid_idx].addr =
554 txvq->virtio_net_hdr_mem +
555 offsetof(struct virtio_tx_region, tx_hdr);
556 vq->vq_ring.desc[desc_idx + mid_idx].len =
557 vq->hw->vtnet_hdr_size;
558 vq->vq_ring.desc[desc_idx + mid_idx].flags =
559 VRING_DESC_F_NEXT;
560 vq->vq_ring.desc[desc_idx].flags = 0;
561 }
562 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
563 desc_idx++)
564 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
565 }
566
567 VIRTQUEUE_DUMP(vq);
568
569 dev->data->tx_queues[queue_idx] = txvq;
570 return 0;
571 }
572
573 static void
574 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
575 {
576 int error;
577 /*
578 * Requeue the discarded mbuf. This should always be
579 * successful since it was just dequeued.
580 */
581 error = virtqueue_enqueue_recv_refill(vq, m);
582 if (unlikely(error)) {
583 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
584 rte_pktmbuf_free(m);
585 }
586 }
587
588 static void
589 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
590 {
591 uint32_t s = mbuf->pkt_len;
592 struct ether_addr *ea;
593
594 if (s == 64) {
595 stats->size_bins[1]++;
596 } else if (s > 64 && s < 1024) {
597 uint32_t bin;
598
599 /* count zeros, and offset into correct bin */
600 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
601 stats->size_bins[bin]++;
602 } else {
603 if (s < 64)
604 stats->size_bins[0]++;
605 else if (s < 1519)
606 stats->size_bins[6]++;
607 else if (s >= 1519)
608 stats->size_bins[7]++;
609 }
610
611 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
612 if (is_multicast_ether_addr(ea)) {
613 if (is_broadcast_ether_addr(ea))
614 stats->broadcast++;
615 else
616 stats->multicast++;
617 }
618 }
619
620 /* Optionally fill offload information in structure */
621 static int
622 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
623 {
624 struct rte_net_hdr_lens hdr_lens;
625 uint32_t hdrlen, ptype;
626 int l4_supported = 0;
627
628 /* nothing to do */
629 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
630 return 0;
631
632 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
633
634 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
635 m->packet_type = ptype;
636 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
637 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
638 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
639 l4_supported = 1;
640
641 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
642 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
643 if (hdr->csum_start <= hdrlen && l4_supported) {
644 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
645 } else {
646 /* Unknown proto or tunnel, do sw cksum. We can assume
647 * the cksum field is in the first segment since the
648 * buffers we provided to the host are large enough.
649 * In case of SCTP, this will be wrong since it's a CRC
650 * but there's nothing we can do.
651 */
652 uint16_t csum, off;
653
654 rte_raw_cksum_mbuf(m, hdr->csum_start,
655 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
656 &csum);
657 if (likely(csum != 0xffff))
658 csum = ~csum;
659 off = hdr->csum_offset + hdr->csum_start;
660 if (rte_pktmbuf_data_len(m) >= off + 1)
661 *rte_pktmbuf_mtod_offset(m, uint16_t *,
662 off) = csum;
663 }
664 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
665 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
666 }
667
668 /* GSO request, save required information in mbuf */
669 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
670 /* Check unsupported modes */
671 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
672 (hdr->gso_size == 0)) {
673 return -EINVAL;
674 }
675
676 /* Update mss lengthes in mbuf */
677 m->tso_segsz = hdr->gso_size;
678 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
679 case VIRTIO_NET_HDR_GSO_TCPV4:
680 case VIRTIO_NET_HDR_GSO_TCPV6:
681 m->ol_flags |= PKT_RX_LRO | \
682 PKT_RX_L4_CKSUM_NONE;
683 break;
684 default:
685 return -EINVAL;
686 }
687 }
688
689 return 0;
690 }
691
692 static inline int
693 rx_offload_enabled(struct virtio_hw *hw)
694 {
695 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
696 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
697 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
698 }
699
700 #define VIRTIO_MBUF_BURST_SZ 64
701 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
702 uint16_t
703 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
704 {
705 struct virtnet_rx *rxvq = rx_queue;
706 struct virtqueue *vq = rxvq->vq;
707 struct virtio_hw *hw;
708 struct rte_mbuf *rxm, *new_mbuf;
709 uint16_t nb_used, num, nb_rx;
710 uint32_t len[VIRTIO_MBUF_BURST_SZ];
711 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
712 int error;
713 uint32_t i, nb_enqueued;
714 uint32_t hdr_size;
715 int offload;
716 struct virtio_net_hdr *hdr;
717
718 nb_used = VIRTQUEUE_NUSED(vq);
719
720 virtio_rmb();
721
722 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
723 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
724 if (likely(num > DESC_PER_CACHELINE))
725 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
726
727 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
728 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
729
730 hw = vq->hw;
731 nb_rx = 0;
732 nb_enqueued = 0;
733 hdr_size = hw->vtnet_hdr_size;
734 offload = rx_offload_enabled(hw);
735
736 for (i = 0; i < num ; i++) {
737 rxm = rcv_pkts[i];
738
739 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
740
741 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
742 PMD_RX_LOG(ERR, "Packet drop");
743 nb_enqueued++;
744 virtio_discard_rxbuf(vq, rxm);
745 rxvq->stats.errors++;
746 continue;
747 }
748
749 rxm->port = rxvq->port_id;
750 rxm->data_off = RTE_PKTMBUF_HEADROOM;
751 rxm->ol_flags = 0;
752 rxm->vlan_tci = 0;
753
754 rxm->nb_segs = 1;
755 rxm->next = NULL;
756 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
757 rxm->data_len = (uint16_t)(len[i] - hdr_size);
758
759 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
760 RTE_PKTMBUF_HEADROOM - hdr_size);
761
762 if (hw->vlan_strip)
763 rte_vlan_strip(rxm);
764
765 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
766 virtio_discard_rxbuf(vq, rxm);
767 rxvq->stats.errors++;
768 continue;
769 }
770
771 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
772
773 rx_pkts[nb_rx++] = rxm;
774
775 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
776 virtio_update_packet_stats(&rxvq->stats, rxm);
777 }
778
779 rxvq->stats.packets += nb_rx;
780
781 /* Allocate new mbuf for the used descriptor */
782 error = ENOSPC;
783 while (likely(!virtqueue_full(vq))) {
784 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
785 if (unlikely(new_mbuf == NULL)) {
786 struct rte_eth_dev *dev
787 = &rte_eth_devices[rxvq->port_id];
788 dev->data->rx_mbuf_alloc_failed++;
789 break;
790 }
791 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
792 if (unlikely(error)) {
793 rte_pktmbuf_free(new_mbuf);
794 break;
795 }
796 nb_enqueued++;
797 }
798
799 if (likely(nb_enqueued)) {
800 vq_update_avail_idx(vq);
801
802 if (unlikely(virtqueue_kick_prepare(vq))) {
803 virtqueue_notify(vq);
804 PMD_RX_LOG(DEBUG, "Notified");
805 }
806 }
807
808 return nb_rx;
809 }
810
811 uint16_t
812 virtio_recv_mergeable_pkts(void *rx_queue,
813 struct rte_mbuf **rx_pkts,
814 uint16_t nb_pkts)
815 {
816 struct virtnet_rx *rxvq = rx_queue;
817 struct virtqueue *vq = rxvq->vq;
818 struct virtio_hw *hw;
819 struct rte_mbuf *rxm, *new_mbuf;
820 uint16_t nb_used, num, nb_rx;
821 uint32_t len[VIRTIO_MBUF_BURST_SZ];
822 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
823 struct rte_mbuf *prev;
824 int error;
825 uint32_t i, nb_enqueued;
826 uint32_t seg_num;
827 uint16_t extra_idx;
828 uint32_t seg_res;
829 uint32_t hdr_size;
830 int offload;
831
832 nb_used = VIRTQUEUE_NUSED(vq);
833
834 virtio_rmb();
835
836 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
837
838 hw = vq->hw;
839 nb_rx = 0;
840 i = 0;
841 nb_enqueued = 0;
842 seg_num = 0;
843 extra_idx = 0;
844 seg_res = 0;
845 hdr_size = hw->vtnet_hdr_size;
846 offload = rx_offload_enabled(hw);
847
848 while (i < nb_used) {
849 struct virtio_net_hdr_mrg_rxbuf *header;
850
851 if (nb_rx == nb_pkts)
852 break;
853
854 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
855 if (num != 1)
856 continue;
857
858 i++;
859
860 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
861 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
862
863 rxm = rcv_pkts[0];
864
865 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
866 PMD_RX_LOG(ERR, "Packet drop");
867 nb_enqueued++;
868 virtio_discard_rxbuf(vq, rxm);
869 rxvq->stats.errors++;
870 continue;
871 }
872
873 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
874 RTE_PKTMBUF_HEADROOM - hdr_size);
875 seg_num = header->num_buffers;
876
877 if (seg_num == 0)
878 seg_num = 1;
879
880 rxm->data_off = RTE_PKTMBUF_HEADROOM;
881 rxm->nb_segs = seg_num;
882 rxm->next = NULL;
883 rxm->ol_flags = 0;
884 rxm->vlan_tci = 0;
885 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
886 rxm->data_len = (uint16_t)(len[0] - hdr_size);
887
888 rxm->port = rxvq->port_id;
889 rx_pkts[nb_rx] = rxm;
890 prev = rxm;
891
892 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
893 virtio_discard_rxbuf(vq, rxm);
894 rxvq->stats.errors++;
895 continue;
896 }
897
898 seg_res = seg_num - 1;
899
900 while (seg_res != 0) {
901 /*
902 * Get extra segments for current uncompleted packet.
903 */
904 uint16_t rcv_cnt =
905 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
906 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
907 uint32_t rx_num =
908 virtqueue_dequeue_burst_rx(vq,
909 rcv_pkts, len, rcv_cnt);
910 i += rx_num;
911 rcv_cnt = rx_num;
912 } else {
913 PMD_RX_LOG(ERR,
914 "No enough segments for packet.");
915 nb_enqueued++;
916 virtio_discard_rxbuf(vq, rxm);
917 rxvq->stats.errors++;
918 break;
919 }
920
921 extra_idx = 0;
922
923 while (extra_idx < rcv_cnt) {
924 rxm = rcv_pkts[extra_idx];
925
926 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
927 rxm->next = NULL;
928 rxm->pkt_len = (uint32_t)(len[extra_idx]);
929 rxm->data_len = (uint16_t)(len[extra_idx]);
930
931 if (prev)
932 prev->next = rxm;
933
934 prev = rxm;
935 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
936 extra_idx++;
937 };
938 seg_res -= rcv_cnt;
939 }
940
941 if (hw->vlan_strip)
942 rte_vlan_strip(rx_pkts[nb_rx]);
943
944 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
945 rx_pkts[nb_rx]->data_len);
946
947 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
948 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
949 nb_rx++;
950 }
951
952 rxvq->stats.packets += nb_rx;
953
954 /* Allocate new mbuf for the used descriptor */
955 error = ENOSPC;
956 while (likely(!virtqueue_full(vq))) {
957 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
958 if (unlikely(new_mbuf == NULL)) {
959 struct rte_eth_dev *dev
960 = &rte_eth_devices[rxvq->port_id];
961 dev->data->rx_mbuf_alloc_failed++;
962 break;
963 }
964 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
965 if (unlikely(error)) {
966 rte_pktmbuf_free(new_mbuf);
967 break;
968 }
969 nb_enqueued++;
970 }
971
972 if (likely(nb_enqueued)) {
973 vq_update_avail_idx(vq);
974
975 if (unlikely(virtqueue_kick_prepare(vq))) {
976 virtqueue_notify(vq);
977 PMD_RX_LOG(DEBUG, "Notified");
978 }
979 }
980
981 return nb_rx;
982 }
983
984 uint16_t
985 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
986 {
987 struct virtnet_tx *txvq = tx_queue;
988 struct virtqueue *vq = txvq->vq;
989 struct virtio_hw *hw = vq->hw;
990 uint16_t hdr_size = hw->vtnet_hdr_size;
991 uint16_t nb_used, nb_tx;
992 int error;
993
994 if (unlikely(nb_pkts < 1))
995 return nb_pkts;
996
997 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
998 nb_used = VIRTQUEUE_NUSED(vq);
999
1000 virtio_rmb();
1001 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1002 virtio_xmit_cleanup(vq, nb_used);
1003
1004 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1005 struct rte_mbuf *txm = tx_pkts[nb_tx];
1006 int can_push = 0, use_indirect = 0, slots, need;
1007
1008 /* Do VLAN tag insertion */
1009 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1010 error = rte_vlan_insert(&txm);
1011 if (unlikely(error)) {
1012 rte_pktmbuf_free(txm);
1013 continue;
1014 }
1015 }
1016
1017 /* optimize ring usage */
1018 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
1019 rte_mbuf_refcnt_read(txm) == 1 &&
1020 RTE_MBUF_DIRECT(txm) &&
1021 txm->nb_segs == 1 &&
1022 rte_pktmbuf_headroom(txm) >= hdr_size &&
1023 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1024 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1025 can_push = 1;
1026 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1027 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1028 use_indirect = 1;
1029
1030 /* How many main ring entries are needed to this Tx?
1031 * any_layout => number of segments
1032 * indirect => 1
1033 * default => number of segments + 1
1034 */
1035 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1036 need = slots - vq->vq_free_cnt;
1037
1038 /* Positive value indicates it need free vring descriptors */
1039 if (unlikely(need > 0)) {
1040 nb_used = VIRTQUEUE_NUSED(vq);
1041 virtio_rmb();
1042 need = RTE_MIN(need, (int)nb_used);
1043
1044 virtio_xmit_cleanup(vq, need);
1045 need = slots - vq->vq_free_cnt;
1046 if (unlikely(need > 0)) {
1047 PMD_TX_LOG(ERR,
1048 "No free tx descriptors to transmit");
1049 break;
1050 }
1051 }
1052
1053 /* Enqueue Packet buffers */
1054 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
1055
1056 txvq->stats.bytes += txm->pkt_len;
1057 virtio_update_packet_stats(&txvq->stats, txm);
1058 }
1059
1060 txvq->stats.packets += nb_tx;
1061
1062 if (likely(nb_tx)) {
1063 vq_update_avail_idx(vq);
1064
1065 if (unlikely(virtqueue_kick_prepare(vq))) {
1066 virtqueue_notify(vq);
1067 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1068 }
1069 }
1070
1071 return nb_tx;
1072 }
Ceph