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[ceph.git] / ceph / src / seastar / 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 int
76 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
77 {
78 struct virtnet_rx *rxvq = rxq;
79 struct virtqueue *vq = rxvq->vq;
80
81 return VIRTQUEUE_NUSED(vq) >= offset;
82 }
83
84 static void
85 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
86 {
87 struct vring_desc *dp, *dp_tail;
88 struct vq_desc_extra *dxp;
89 uint16_t desc_idx_last = desc_idx;
90
91 dp = &vq->vq_ring.desc[desc_idx];
92 dxp = &vq->vq_descx[desc_idx];
93 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
94 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
95 while (dp->flags & VRING_DESC_F_NEXT) {
96 desc_idx_last = dp->next;
97 dp = &vq->vq_ring.desc[dp->next];
98 }
99 }
100 dxp->ndescs = 0;
101
102 /*
103 * We must append the existing free chain, if any, to the end of
104 * newly freed chain. If the virtqueue was completely used, then
105 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
106 */
107 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
108 vq->vq_desc_head_idx = desc_idx;
109 } else {
110 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
111 dp_tail->next = desc_idx;
112 }
113
114 vq->vq_desc_tail_idx = desc_idx_last;
115 dp->next = VQ_RING_DESC_CHAIN_END;
116 }
117
118 static uint16_t
119 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
120 uint32_t *len, uint16_t num)
121 {
122 struct vring_used_elem *uep;
123 struct rte_mbuf *cookie;
124 uint16_t used_idx, desc_idx;
125 uint16_t i;
126
127 /* Caller does the check */
128 for (i = 0; i < num ; i++) {
129 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
130 uep = &vq->vq_ring.used->ring[used_idx];
131 desc_idx = (uint16_t) uep->id;
132 len[i] = uep->len;
133 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
134
135 if (unlikely(cookie == NULL)) {
136 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
137 vq->vq_used_cons_idx);
138 break;
139 }
140
141 rte_prefetch0(cookie);
142 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
143 rx_pkts[i] = cookie;
144 vq->vq_used_cons_idx++;
145 vq_ring_free_chain(vq, desc_idx);
146 vq->vq_descx[desc_idx].cookie = NULL;
147 }
148
149 return i;
150 }
151
152 #ifndef DEFAULT_TX_FREE_THRESH
153 #define DEFAULT_TX_FREE_THRESH 32
154 #endif
155
156 /* Cleanup from completed transmits. */
157 static void
158 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
159 {
160 uint16_t i, used_idx, desc_idx;
161 for (i = 0; i < num; i++) {
162 struct vring_used_elem *uep;
163 struct vq_desc_extra *dxp;
164
165 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
166 uep = &vq->vq_ring.used->ring[used_idx];
167
168 desc_idx = (uint16_t) uep->id;
169 dxp = &vq->vq_descx[desc_idx];
170 vq->vq_used_cons_idx++;
171 vq_ring_free_chain(vq, desc_idx);
172
173 if (dxp->cookie != NULL) {
174 rte_pktmbuf_free(dxp->cookie);
175 dxp->cookie = NULL;
176 }
177 }
178 }
179
180
181 static inline int
182 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
183 {
184 struct vq_desc_extra *dxp;
185 struct virtio_hw *hw = vq->hw;
186 struct vring_desc *start_dp;
187 uint16_t needed = 1;
188 uint16_t head_idx, idx;
189
190 if (unlikely(vq->vq_free_cnt == 0))
191 return -ENOSPC;
192 if (unlikely(vq->vq_free_cnt < needed))
193 return -EMSGSIZE;
194
195 head_idx = vq->vq_desc_head_idx;
196 if (unlikely(head_idx >= vq->vq_nentries))
197 return -EFAULT;
198
199 idx = head_idx;
200 dxp = &vq->vq_descx[idx];
201 dxp->cookie = (void *)cookie;
202 dxp->ndescs = needed;
203
204 start_dp = vq->vq_ring.desc;
205 start_dp[idx].addr =
206 VIRTIO_MBUF_ADDR(cookie, vq) +
207 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
208 start_dp[idx].len =
209 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
210 start_dp[idx].flags = VRING_DESC_F_WRITE;
211 idx = start_dp[idx].next;
212 vq->vq_desc_head_idx = idx;
213 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
214 vq->vq_desc_tail_idx = idx;
215 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
216 vq_update_avail_ring(vq, head_idx);
217
218 return 0;
219 }
220
221 /* When doing TSO, the IP length is not included in the pseudo header
222 * checksum of the packet given to the PMD, but for virtio it is
223 * expected.
224 */
225 static void
226 virtio_tso_fix_cksum(struct rte_mbuf *m)
227 {
228 /* common case: header is not fragmented */
229 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
230 m->l4_len)) {
231 struct ipv4_hdr *iph;
232 struct ipv6_hdr *ip6h;
233 struct tcp_hdr *th;
234 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
235 uint32_t tmp;
236
237 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
238 th = RTE_PTR_ADD(iph, m->l3_len);
239 if ((iph->version_ihl >> 4) == 4) {
240 iph->hdr_checksum = 0;
241 iph->hdr_checksum = rte_ipv4_cksum(iph);
242 ip_len = iph->total_length;
243 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
244 m->l3_len);
245 } else {
246 ip6h = (struct ipv6_hdr *)iph;
247 ip_paylen = ip6h->payload_len;
248 }
249
250 /* calculate the new phdr checksum not including ip_paylen */
251 prev_cksum = th->cksum;
252 tmp = prev_cksum;
253 tmp += ip_paylen;
254 tmp = (tmp & 0xffff) + (tmp >> 16);
255 new_cksum = tmp;
256
257 /* replace it in the packet */
258 th->cksum = new_cksum;
259 }
260 }
261
262 static inline int
263 tx_offload_enabled(struct virtio_hw *hw)
264 {
265 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
266 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
267 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
268 }
269
270 /* avoid write operation when necessary, to lessen cache issues */
271 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
272 if ((var) != (val)) \
273 (var) = (val); \
274 } while (0)
275
276 static inline void
277 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
278 uint16_t needed, int use_indirect, int can_push)
279 {
280 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
281 struct vq_desc_extra *dxp;
282 struct virtqueue *vq = txvq->vq;
283 struct vring_desc *start_dp;
284 uint16_t seg_num = cookie->nb_segs;
285 uint16_t head_idx, idx;
286 uint16_t head_size = vq->hw->vtnet_hdr_size;
287 struct virtio_net_hdr *hdr;
288 int offload;
289
290 offload = tx_offload_enabled(vq->hw);
291 head_idx = vq->vq_desc_head_idx;
292 idx = head_idx;
293 dxp = &vq->vq_descx[idx];
294 dxp->cookie = (void *)cookie;
295 dxp->ndescs = needed;
296
297 start_dp = vq->vq_ring.desc;
298
299 if (can_push) {
300 /* prepend cannot fail, checked by caller */
301 hdr = (struct virtio_net_hdr *)
302 rte_pktmbuf_prepend(cookie, head_size);
303 /* if offload disabled, it is not zeroed below, do it now */
304 if (offload == 0) {
305 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
306 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
307 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
308 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
309 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
310 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
311 }
312 } else if (use_indirect) {
313 /* setup tx ring slot to point to indirect
314 * descriptor list stored in reserved region.
315 *
316 * the first slot in indirect ring is already preset
317 * to point to the header in reserved region
318 */
319 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
320 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
321 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
322 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
323 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
324
325 /* loop below will fill in rest of the indirect elements */
326 start_dp = txr[idx].tx_indir;
327 idx = 1;
328 } else {
329 /* setup first tx ring slot to point to header
330 * stored in reserved region.
331 */
332 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
333 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
334 start_dp[idx].len = vq->hw->vtnet_hdr_size;
335 start_dp[idx].flags = VRING_DESC_F_NEXT;
336 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
337
338 idx = start_dp[idx].next;
339 }
340
341 /* Checksum Offload / TSO */
342 if (offload) {
343 if (cookie->ol_flags & PKT_TX_TCP_SEG)
344 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
345
346 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
347 case PKT_TX_UDP_CKSUM:
348 hdr->csum_start = cookie->l2_len + cookie->l3_len;
349 hdr->csum_offset = offsetof(struct udp_hdr,
350 dgram_cksum);
351 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
352 break;
353
354 case PKT_TX_TCP_CKSUM:
355 hdr->csum_start = cookie->l2_len + cookie->l3_len;
356 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
357 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
358 break;
359
360 default:
361 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
362 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
363 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
364 break;
365 }
366
367 /* TCP Segmentation Offload */
368 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
369 virtio_tso_fix_cksum(cookie);
370 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
371 VIRTIO_NET_HDR_GSO_TCPV6 :
372 VIRTIO_NET_HDR_GSO_TCPV4;
373 hdr->gso_size = cookie->tso_segsz;
374 hdr->hdr_len =
375 cookie->l2_len +
376 cookie->l3_len +
377 cookie->l4_len;
378 } else {
379 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
380 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
381 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
382 }
383 }
384
385 do {
386 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
387 start_dp[idx].len = cookie->data_len;
388 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
389 idx = start_dp[idx].next;
390 } while ((cookie = cookie->next) != NULL);
391
392 if (use_indirect)
393 idx = vq->vq_ring.desc[head_idx].next;
394
395 vq->vq_desc_head_idx = idx;
396 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
397 vq->vq_desc_tail_idx = idx;
398 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
399 vq_update_avail_ring(vq, head_idx);
400 }
401
402 void
403 virtio_dev_cq_start(struct rte_eth_dev *dev)
404 {
405 struct virtio_hw *hw = dev->data->dev_private;
406
407 if (hw->cvq && hw->cvq->vq) {
408 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
409 }
410 }
411
412 int
413 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
414 uint16_t queue_idx,
415 uint16_t nb_desc,
416 unsigned int socket_id __rte_unused,
417 __rte_unused const struct rte_eth_rxconf *rx_conf,
418 struct rte_mempool *mp)
419 {
420 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
421 struct virtio_hw *hw = dev->data->dev_private;
422 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
423 struct virtnet_rx *rxvq;
424 int error, nbufs;
425 struct rte_mbuf *m;
426 uint16_t desc_idx;
427
428 PMD_INIT_FUNC_TRACE();
429
430 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
431 nb_desc = vq->vq_nentries;
432 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
433
434 rxvq = &vq->rxq;
435 rxvq->queue_id = queue_idx;
436 rxvq->mpool = mp;
437 if (rxvq->mpool == NULL) {
438 rte_exit(EXIT_FAILURE,
439 "Cannot allocate mbufs for rx virtqueue");
440 }
441 dev->data->rx_queues[queue_idx] = rxvq;
442
443
444 /* Allocate blank mbufs for the each rx descriptor */
445 nbufs = 0;
446 error = ENOSPC;
447
448 if (hw->use_simple_rxtx) {
449 for (desc_idx = 0; desc_idx < vq->vq_nentries;
450 desc_idx++) {
451 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
452 vq->vq_ring.desc[desc_idx].flags =
453 VRING_DESC_F_WRITE;
454 }
455 }
456
457 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
458 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
459 desc_idx++) {
460 vq->sw_ring[vq->vq_nentries + desc_idx] =
461 &rxvq->fake_mbuf;
462 }
463
464 while (!virtqueue_full(vq)) {
465 m = rte_mbuf_raw_alloc(rxvq->mpool);
466 if (m == NULL)
467 break;
468
469 /* Enqueue allocated buffers */
470 if (hw->use_simple_rxtx)
471 error = virtqueue_enqueue_recv_refill_simple(vq, m);
472 else
473 error = virtqueue_enqueue_recv_refill(vq, m);
474
475 if (error) {
476 rte_pktmbuf_free(m);
477 break;
478 }
479 nbufs++;
480 }
481
482 vq_update_avail_idx(vq);
483
484 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
485
486 virtio_rxq_vec_setup(rxvq);
487
488 VIRTQUEUE_DUMP(vq);
489
490 return 0;
491 }
492
493 static void
494 virtio_update_rxtx_handler(struct rte_eth_dev *dev,
495 const struct rte_eth_txconf *tx_conf)
496 {
497 uint8_t use_simple_rxtx = 0;
498 struct virtio_hw *hw = dev->data->dev_private;
499
500 #if defined RTE_ARCH_X86
501 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3))
502 use_simple_rxtx = 1;
503 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
504 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
505 use_simple_rxtx = 1;
506 #endif
507 /* Use simple rx/tx func if single segment and no offloads */
508 if (use_simple_rxtx &&
509 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
510 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
511 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
512 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
513 dev->rx_pkt_burst = virtio_recv_pkts_vec;
514 hw->use_simple_rxtx = use_simple_rxtx;
515 }
516 }
517
518 /*
519 * struct rte_eth_dev *dev: Used to update dev
520 * uint16_t nb_desc: Defaults to values read from config space
521 * unsigned int socket_id: Used to allocate memzone
522 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
523 * uint16_t queue_idx: Just used as an index in dev txq list
524 */
525 int
526 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
527 uint16_t queue_idx,
528 uint16_t nb_desc,
529 unsigned int socket_id __rte_unused,
530 const struct rte_eth_txconf *tx_conf)
531 {
532 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
533 struct virtio_hw *hw = dev->data->dev_private;
534 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
535 struct virtnet_tx *txvq;
536 uint16_t tx_free_thresh;
537 uint16_t desc_idx;
538
539 PMD_INIT_FUNC_TRACE();
540
541 virtio_update_rxtx_handler(dev, tx_conf);
542
543 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
544 nb_desc = vq->vq_nentries;
545 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
546
547 txvq = &vq->txq;
548 txvq->queue_id = queue_idx;
549
550 tx_free_thresh = tx_conf->tx_free_thresh;
551 if (tx_free_thresh == 0)
552 tx_free_thresh =
553 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
554
555 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
556 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
557 "number of TX entries minus 3 (%u)."
558 " (tx_free_thresh=%u port=%u queue=%u)\n",
559 vq->vq_nentries - 3,
560 tx_free_thresh, dev->data->port_id, queue_idx);
561 return -EINVAL;
562 }
563
564 vq->vq_free_thresh = tx_free_thresh;
565
566 if (hw->use_simple_rxtx) {
567 uint16_t mid_idx = vq->vq_nentries >> 1;
568
569 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
570 vq->vq_ring.avail->ring[desc_idx] =
571 desc_idx + mid_idx;
572 vq->vq_ring.desc[desc_idx + mid_idx].next =
573 desc_idx;
574 vq->vq_ring.desc[desc_idx + mid_idx].addr =
575 txvq->virtio_net_hdr_mem +
576 offsetof(struct virtio_tx_region, tx_hdr);
577 vq->vq_ring.desc[desc_idx + mid_idx].len =
578 vq->hw->vtnet_hdr_size;
579 vq->vq_ring.desc[desc_idx + mid_idx].flags =
580 VRING_DESC_F_NEXT;
581 vq->vq_ring.desc[desc_idx].flags = 0;
582 }
583 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
584 desc_idx++)
585 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
586 }
587
588 VIRTQUEUE_DUMP(vq);
589
590 dev->data->tx_queues[queue_idx] = txvq;
591 return 0;
592 }
593
594 static void
595 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
596 {
597 int error;
598 /*
599 * Requeue the discarded mbuf. This should always be
600 * successful since it was just dequeued.
601 */
602 error = virtqueue_enqueue_recv_refill(vq, m);
603 if (unlikely(error)) {
604 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
605 rte_pktmbuf_free(m);
606 }
607 }
608
609 static void
610 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
611 {
612 uint32_t s = mbuf->pkt_len;
613 struct ether_addr *ea;
614
615 if (s == 64) {
616 stats->size_bins[1]++;
617 } else if (s > 64 && s < 1024) {
618 uint32_t bin;
619
620 /* count zeros, and offset into correct bin */
621 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
622 stats->size_bins[bin]++;
623 } else {
624 if (s < 64)
625 stats->size_bins[0]++;
626 else if (s < 1519)
627 stats->size_bins[6]++;
628 else if (s >= 1519)
629 stats->size_bins[7]++;
630 }
631
632 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
633 if (is_multicast_ether_addr(ea)) {
634 if (is_broadcast_ether_addr(ea))
635 stats->broadcast++;
636 else
637 stats->multicast++;
638 }
639 }
640
641 /* Optionally fill offload information in structure */
642 static int
643 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
644 {
645 struct rte_net_hdr_lens hdr_lens;
646 uint32_t hdrlen, ptype;
647 int l4_supported = 0;
648
649 /* nothing to do */
650 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
651 return 0;
652
653 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
654
655 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
656 m->packet_type = ptype;
657 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
658 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
659 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
660 l4_supported = 1;
661
662 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
663 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
664 if (hdr->csum_start <= hdrlen && l4_supported) {
665 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
666 } else {
667 /* Unknown proto or tunnel, do sw cksum. We can assume
668 * the cksum field is in the first segment since the
669 * buffers we provided to the host are large enough.
670 * In case of SCTP, this will be wrong since it's a CRC
671 * but there's nothing we can do.
672 */
673 uint16_t csum, off;
674
675 rte_raw_cksum_mbuf(m, hdr->csum_start,
676 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
677 &csum);
678 if (likely(csum != 0xffff))
679 csum = ~csum;
680 off = hdr->csum_offset + hdr->csum_start;
681 if (rte_pktmbuf_data_len(m) >= off + 1)
682 *rte_pktmbuf_mtod_offset(m, uint16_t *,
683 off) = csum;
684 }
685 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
686 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
687 }
688
689 /* GSO request, save required information in mbuf */
690 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
691 /* Check unsupported modes */
692 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
693 (hdr->gso_size == 0)) {
694 return -EINVAL;
695 }
696
697 /* Update mss lengthes in mbuf */
698 m->tso_segsz = hdr->gso_size;
699 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
700 case VIRTIO_NET_HDR_GSO_TCPV4:
701 case VIRTIO_NET_HDR_GSO_TCPV6:
702 m->ol_flags |= PKT_RX_LRO | \
703 PKT_RX_L4_CKSUM_NONE;
704 break;
705 default:
706 return -EINVAL;
707 }
708 }
709
710 return 0;
711 }
712
713 static inline int
714 rx_offload_enabled(struct virtio_hw *hw)
715 {
716 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
717 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
718 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
719 }
720
721 #define VIRTIO_MBUF_BURST_SZ 64
722 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
723 uint16_t
724 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
725 {
726 struct virtnet_rx *rxvq = rx_queue;
727 struct virtqueue *vq = rxvq->vq;
728 struct virtio_hw *hw = vq->hw;
729 struct rte_mbuf *rxm, *new_mbuf;
730 uint16_t nb_used, num, nb_rx;
731 uint32_t len[VIRTIO_MBUF_BURST_SZ];
732 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
733 int error;
734 uint32_t i, nb_enqueued;
735 uint32_t hdr_size;
736 int offload;
737 struct virtio_net_hdr *hdr;
738
739 nb_rx = 0;
740 if (unlikely(hw->started == 0))
741 return nb_rx;
742
743 nb_used = VIRTQUEUE_NUSED(vq);
744
745 virtio_rmb();
746
747 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
748 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
749 if (likely(num > DESC_PER_CACHELINE))
750 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
751
752 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
753 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
754
755 nb_enqueued = 0;
756 hdr_size = hw->vtnet_hdr_size;
757 offload = rx_offload_enabled(hw);
758
759 for (i = 0; i < num ; i++) {
760 rxm = rcv_pkts[i];
761
762 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
763
764 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
765 PMD_RX_LOG(ERR, "Packet drop");
766 nb_enqueued++;
767 virtio_discard_rxbuf(vq, rxm);
768 rxvq->stats.errors++;
769 continue;
770 }
771
772 rxm->port = rxvq->port_id;
773 rxm->data_off = RTE_PKTMBUF_HEADROOM;
774 rxm->ol_flags = 0;
775 rxm->vlan_tci = 0;
776
777 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
778 rxm->data_len = (uint16_t)(len[i] - hdr_size);
779
780 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
781 RTE_PKTMBUF_HEADROOM - hdr_size);
782
783 if (hw->vlan_strip)
784 rte_vlan_strip(rxm);
785
786 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
787 virtio_discard_rxbuf(vq, rxm);
788 rxvq->stats.errors++;
789 continue;
790 }
791
792 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
793
794 rx_pkts[nb_rx++] = rxm;
795
796 rxvq->stats.bytes += rxm->pkt_len;
797 virtio_update_packet_stats(&rxvq->stats, rxm);
798 }
799
800 rxvq->stats.packets += nb_rx;
801
802 /* Allocate new mbuf for the used descriptor */
803 error = ENOSPC;
804 while (likely(!virtqueue_full(vq))) {
805 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
806 if (unlikely(new_mbuf == NULL)) {
807 struct rte_eth_dev *dev
808 = &rte_eth_devices[rxvq->port_id];
809 dev->data->rx_mbuf_alloc_failed++;
810 break;
811 }
812 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
813 if (unlikely(error)) {
814 rte_pktmbuf_free(new_mbuf);
815 break;
816 }
817 nb_enqueued++;
818 }
819
820 if (likely(nb_enqueued)) {
821 vq_update_avail_idx(vq);
822
823 if (unlikely(virtqueue_kick_prepare(vq))) {
824 virtqueue_notify(vq);
825 PMD_RX_LOG(DEBUG, "Notified");
826 }
827 }
828
829 return nb_rx;
830 }
831
832 uint16_t
833 virtio_recv_mergeable_pkts(void *rx_queue,
834 struct rte_mbuf **rx_pkts,
835 uint16_t nb_pkts)
836 {
837 struct virtnet_rx *rxvq = rx_queue;
838 struct virtqueue *vq = rxvq->vq;
839 struct virtio_hw *hw = vq->hw;
840 struct rte_mbuf *rxm, *new_mbuf;
841 uint16_t nb_used, num, nb_rx;
842 uint32_t len[VIRTIO_MBUF_BURST_SZ];
843 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
844 struct rte_mbuf *prev;
845 int error;
846 uint32_t i, nb_enqueued;
847 uint32_t seg_num;
848 uint16_t extra_idx;
849 uint32_t seg_res;
850 uint32_t hdr_size;
851 int offload;
852
853 nb_rx = 0;
854 if (unlikely(hw->started == 0))
855 return nb_rx;
856
857 nb_used = VIRTQUEUE_NUSED(vq);
858
859 virtio_rmb();
860
861 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
862
863 i = 0;
864 nb_enqueued = 0;
865 seg_num = 0;
866 extra_idx = 0;
867 seg_res = 0;
868 hdr_size = hw->vtnet_hdr_size;
869 offload = rx_offload_enabled(hw);
870
871 while (i < nb_used) {
872 struct virtio_net_hdr_mrg_rxbuf *header;
873
874 if (nb_rx == nb_pkts)
875 break;
876
877 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
878 if (num != 1)
879 continue;
880
881 i++;
882
883 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
884 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
885
886 rxm = rcv_pkts[0];
887
888 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
889 PMD_RX_LOG(ERR, "Packet drop");
890 nb_enqueued++;
891 virtio_discard_rxbuf(vq, rxm);
892 rxvq->stats.errors++;
893 continue;
894 }
895
896 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
897 RTE_PKTMBUF_HEADROOM - hdr_size);
898 seg_num = header->num_buffers;
899
900 if (seg_num == 0)
901 seg_num = 1;
902
903 rxm->data_off = RTE_PKTMBUF_HEADROOM;
904 rxm->nb_segs = seg_num;
905 rxm->ol_flags = 0;
906 rxm->vlan_tci = 0;
907 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
908 rxm->data_len = (uint16_t)(len[0] - hdr_size);
909
910 rxm->port = rxvq->port_id;
911 rx_pkts[nb_rx] = rxm;
912 prev = rxm;
913
914 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
915 virtio_discard_rxbuf(vq, rxm);
916 rxvq->stats.errors++;
917 continue;
918 }
919
920 seg_res = seg_num - 1;
921
922 while (seg_res != 0) {
923 /*
924 * Get extra segments for current uncompleted packet.
925 */
926 uint16_t rcv_cnt =
927 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
928 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
929 uint32_t rx_num =
930 virtqueue_dequeue_burst_rx(vq,
931 rcv_pkts, len, rcv_cnt);
932 i += rx_num;
933 rcv_cnt = rx_num;
934 } else {
935 PMD_RX_LOG(ERR,
936 "No enough segments for packet.");
937 nb_enqueued++;
938 virtio_discard_rxbuf(vq, rxm);
939 rxvq->stats.errors++;
940 break;
941 }
942
943 extra_idx = 0;
944
945 while (extra_idx < rcv_cnt) {
946 rxm = rcv_pkts[extra_idx];
947
948 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
949 rxm->pkt_len = (uint32_t)(len[extra_idx]);
950 rxm->data_len = (uint16_t)(len[extra_idx]);
951
952 if (prev)
953 prev->next = rxm;
954
955 prev = rxm;
956 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
957 extra_idx++;
958 };
959 seg_res -= rcv_cnt;
960 }
961
962 if (hw->vlan_strip)
963 rte_vlan_strip(rx_pkts[nb_rx]);
964
965 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
966 rx_pkts[nb_rx]->data_len);
967
968 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
969 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
970 nb_rx++;
971 }
972
973 rxvq->stats.packets += nb_rx;
974
975 /* Allocate new mbuf for the used descriptor */
976 error = ENOSPC;
977 while (likely(!virtqueue_full(vq))) {
978 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
979 if (unlikely(new_mbuf == NULL)) {
980 struct rte_eth_dev *dev
981 = &rte_eth_devices[rxvq->port_id];
982 dev->data->rx_mbuf_alloc_failed++;
983 break;
984 }
985 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
986 if (unlikely(error)) {
987 rte_pktmbuf_free(new_mbuf);
988 break;
989 }
990 nb_enqueued++;
991 }
992
993 if (likely(nb_enqueued)) {
994 vq_update_avail_idx(vq);
995
996 if (unlikely(virtqueue_kick_prepare(vq))) {
997 virtqueue_notify(vq);
998 PMD_RX_LOG(DEBUG, "Notified");
999 }
1000 }
1001
1002 return nb_rx;
1003 }
1004
1005 uint16_t
1006 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1007 {
1008 struct virtnet_tx *txvq = tx_queue;
1009 struct virtqueue *vq = txvq->vq;
1010 struct virtio_hw *hw = vq->hw;
1011 uint16_t hdr_size = hw->vtnet_hdr_size;
1012 uint16_t nb_used, nb_tx = 0;
1013 int error;
1014
1015 if (unlikely(hw->started == 0))
1016 return nb_tx;
1017
1018 if (unlikely(nb_pkts < 1))
1019 return nb_pkts;
1020
1021 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1022 nb_used = VIRTQUEUE_NUSED(vq);
1023
1024 virtio_rmb();
1025 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1026 virtio_xmit_cleanup(vq, nb_used);
1027
1028 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1029 struct rte_mbuf *txm = tx_pkts[nb_tx];
1030 int can_push = 0, use_indirect = 0, slots, need;
1031
1032 /* Do VLAN tag insertion */
1033 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1034 error = rte_vlan_insert(&txm);
1035 if (unlikely(error)) {
1036 rte_pktmbuf_free(txm);
1037 continue;
1038 }
1039 }
1040
1041 /* optimize ring usage */
1042 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1043 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1044 rte_mbuf_refcnt_read(txm) == 1 &&
1045 RTE_MBUF_DIRECT(txm) &&
1046 txm->nb_segs == 1 &&
1047 rte_pktmbuf_headroom(txm) >= hdr_size &&
1048 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1049 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1050 can_push = 1;
1051 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1052 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1053 use_indirect = 1;
1054
1055 /* How many main ring entries are needed to this Tx?
1056 * any_layout => number of segments
1057 * indirect => 1
1058 * default => number of segments + 1
1059 */
1060 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1061 need = slots - vq->vq_free_cnt;
1062
1063 /* Positive value indicates it need free vring descriptors */
1064 if (unlikely(need > 0)) {
1065 nb_used = VIRTQUEUE_NUSED(vq);
1066 virtio_rmb();
1067 need = RTE_MIN(need, (int)nb_used);
1068
1069 virtio_xmit_cleanup(vq, need);
1070 need = slots - vq->vq_free_cnt;
1071 if (unlikely(need > 0)) {
1072 PMD_TX_LOG(ERR,
1073 "No free tx descriptors to transmit");
1074 break;
1075 }
1076 }
1077
1078 /* Enqueue Packet buffers */
1079 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
1080
1081 txvq->stats.bytes += txm->pkt_len;
1082 virtio_update_packet_stats(&txvq->stats, txm);
1083 }
1084
1085 txvq->stats.packets += nb_tx;
1086
1087 if (likely(nb_tx)) {
1088 vq_update_avail_idx(vq);
1089
1090 if (unlikely(virtqueue_kick_prepare(vq))) {
1091 virtqueue_notify(vq);
1092 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1093 }
1094 }
1095
1096 return nb_tx;
1097 }
Ceph