2 *------------------------------------------------------------------
3 * Copyright (c) 2016 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
18 #include <sys/types.h>
22 #include <vlib/vlib.h>
23 #include <vlib/unix/unix.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ethernet/ethernet.h>
26 #include <vnet/gso/gro_func.h>
27 #include <vnet/gso/hdr_offset_parser.h>
28 #include <vnet/ip/ip4_packet.h>
29 #include <vnet/ip/ip6_packet.h>
30 #include <vnet/ip/ip_psh_cksum.h>
31 #include <vnet/tcp/tcp_packet.h>
32 #include <vnet/udp/udp_packet.h>
33 #include <vnet/devices/virtio/virtio.h>
35 #define VIRTIO_TX_MAX_CHAIN_LEN 127
37 #define foreach_virtio_tx_func_error \
38 _(NO_FREE_SLOTS, "no free tx slots") \
39 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
40 _(PENDING_MSGS, "pending msgs in tx ring") \
41 _(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \
42 _(OUT_OF_ORDER, "out-of-order buffers in used ring") \
43 _(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \
44 _(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop")
48 #define _(f,s) VIRTIO_TX_ERROR_##f,
49 foreach_virtio_tx_func_error
52 } virtio_tx_func_error_t;
54 static char *virtio_tx_func_error_strings[] = {
56 foreach_virtio_tx_func_error
61 format_virtio_device (u8 * s, va_list * args)
63 u32 dev_instance = va_arg (*args, u32);
64 int verbose = va_arg (*args, int);
65 u32 indent = format_get_indent (s);
67 s = format (s, "VIRTIO interface");
70 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
80 generic_header_offset_t gho;
85 format_virtio_tx_trace (u8 * s, va_list * va)
87 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
88 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
89 virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
90 u32 indent = format_get_indent (s);
92 s = format (s, "%Ubuffer 0x%x: %U\n", format_white_space, indent,
93 t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
95 format (s, "%U%U\n", format_white_space, indent,
96 format_generic_header_offset, &t->gho);
98 format (s, "%U%U", format_white_space, indent,
99 format_ethernet_header_with_length, t->buffer.pre_data,
100 sizeof (t->buffer.pre_data));
105 virtio_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b0,
108 virtio_tx_trace_t *t;
109 t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
110 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
111 t->buffer_index = bi;
114 int is_ip4 = 0, is_ip6 = 0;
116 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
127 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
130 vnet_generic_header_offset_parser (b0, &t->gho, 1,
132 VNET_BUFFER_F_IS_IP4,
133 b0->flags & VNET_BUFFER_F_IS_IP6);
135 clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
136 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
137 sizeof (t->buffer.pre_data));
141 virtio_interface_drop_inline (vlib_main_t *vm, virtio_if_t *vif,
142 uword node_index, u32 *buffers, u16 n,
143 virtio_tx_func_error_t error)
145 vlib_error_count (vm, node_index, error, n);
146 vlib_increment_simple_counter (vnet_main.interface_main.sw_if_counters +
147 VNET_INTERFACE_COUNTER_DROP,
148 vm->thread_index, vif->sw_if_index, n);
149 vlib_buffer_free (vm, buffers, n);
153 virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
155 ASSERT (n_buffers <= ring_size);
157 if (PREDICT_TRUE (start + n_buffers <= ring_size))
159 clib_memset_u32 (ring + start, ~0, n_buffers);
163 clib_memset_u32 (ring + start, ~0, ring_size - start);
164 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
169 virtio_free_used_device_desc_split (vlib_main_t *vm,
170 vnet_virtio_vring_t *vring,
173 u16 used = vring->desc_in_use;
174 u16 sz = vring->queue_size;
176 u16 last = vring->last_used_idx;
177 u16 n_left = vring->used->idx - last;
178 u16 out_of_order_count = 0;
185 vnet_virtio_vring_used_elem_t *e = &vring->used->ring[last & mask];
187 slot = n_buffers = e->id;
189 while (e->id == (n_buffers & mask))
194 vnet_virtio_vring_desc_t *d = &vring->desc[e->id];
196 while (d->flags & VRING_DESC_F_NEXT)
200 d = &vring->desc[next];
204 e = &vring->used->ring[last & mask];
206 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
207 sz, (n_buffers - slot));
208 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
209 used -= (n_buffers - slot);
213 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
214 vring->buffers[e->id] = ~0;
218 out_of_order_count++;
219 vring->flags |= VRING_TX_OUT_OF_ORDER;
224 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
225 * It impacts the overall virtio-performance.
227 if (out_of_order_count)
228 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
231 vring->desc_in_use = used;
232 vring->last_used_idx = last;
236 virtio_free_used_device_desc_packed (vlib_main_t *vm,
237 vnet_virtio_vring_t *vring,
240 vnet_virtio_vring_packed_desc_t *d;
241 u16 sz = vring->queue_size;
242 u16 last = vring->last_used_idx;
243 u16 n_buffers = 0, start;
246 if (vring->desc_in_use == 0)
249 d = &vring->packed_desc[last];
253 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
254 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
262 vring->used_wrap_counter ^= 1;
264 d = &vring->packed_desc[last];
270 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
271 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
272 vring->desc_in_use -= n_buffers;
273 vring->last_used_idx = last;
278 virtio_free_used_device_desc (vlib_main_t *vm, vnet_virtio_vring_t *vring,
279 uword node_index, int packed)
282 virtio_free_used_device_desc_packed (vm, vring, node_index);
284 virtio_free_used_device_desc_split (vm, vring, node_index);
289 set_checksum_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
292 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
294 if (b->flags & VNET_BUFFER_F_IS_IP4)
297 generic_header_offset_t gho = { 0 };
298 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
300 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
301 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
304 * virtio devices do not support IP4 checksum offload. So driver takes
305 * care of it while doing tx.
307 ip4 = (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
308 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
309 ip4->checksum = ip4_header_checksum (ip4);
312 * virtio devices assume the l4 header is set to the checksum of the
313 * l3 pseudo-header, so we compute it before tx-ing
315 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
318 (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
319 tcp->checksum = ip4_pseudo_header_cksum (ip4);
320 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
322 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
325 (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
326 udp->checksum = ip4_pseudo_header_cksum (ip4);
327 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
330 else if (b->flags & VNET_BUFFER_F_IS_IP6)
333 generic_header_offset_t gho = { 0 };
334 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
336 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
337 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
338 ip6 = (ip6_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
341 * virtio devices assume the l4 header is set to the checksum of the
342 * l3 pseudo-header, so we compute it before tx-ing
344 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
347 (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
348 tcp->checksum = ip6_pseudo_header_cksum (ip6);
349 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
351 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
354 (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
355 udp->checksum = ip6_pseudo_header_cksum (ip6);
356 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
362 set_gso_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
365 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
367 if (b->flags & VNET_BUFFER_F_IS_IP4)
370 generic_header_offset_t gho = { 0 };
371 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
373 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
374 hdr->gso_size = vnet_buffer2 (b)->gso_size;
375 hdr->hdr_len = gho.hdr_sz;
376 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
377 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
378 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
380 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
382 * virtio devices do not support IP4 checksum offload. So driver takes care
383 * of it while doing tx.
385 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
386 ip4->checksum = ip4_header_checksum (ip4);
388 else if (b->flags & VNET_BUFFER_F_IS_IP6)
390 generic_header_offset_t gho = { 0 };
391 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
393 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
394 hdr->gso_size = vnet_buffer2 (b)->gso_size;
395 hdr->hdr_len = gho.hdr_sz;
396 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
397 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
398 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
403 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
404 virtio_if_t *vif, vnet_virtio_vring_t *vring, u32 bi,
405 u16 free_desc_count, u16 avail, u16 next, u16 mask,
406 int hdr_sz, int do_gso, int csum_offload, int is_pci,
407 int is_tun, int is_indirect, int is_any_layout)
410 vnet_virtio_vring_desc_t *d;
412 d = &vring->desc[next];
413 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
414 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
415 u32 drop_inline = ~0;
417 clib_memset_u8 (hdr, 0, hdr_sz);
419 if (b->flags & VNET_BUFFER_F_GSO)
422 set_gso_offsets (b, hdr, is_l2);
425 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
429 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
432 set_checksum_offsets (b, hdr, is_l2);
435 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
440 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
442 virtio_tx_trace (vm, node, b, bi, is_tun);
445 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
447 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
448 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
449 d->len = b->current_length + hdr_sz;
452 else if (is_indirect)
455 * We are using single vlib_buffer_t for indirect descriptor(s)
456 * chain. Single descriptor is 16 bytes and vlib_buffer_t
457 * has 2048 bytes space. So maximum long chain can have 128
458 * (=2048/16) indirect descriptors.
459 * It can easily support 65535 bytes of Jumbo frames with
460 * each data buffer size of 512 bytes minimum.
462 u32 indirect_buffer = 0;
463 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
465 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
469 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
470 indirect_desc->current_data = 0;
471 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
472 indirect_desc->next_buffer = bi;
473 bi = indirect_buffer;
475 vnet_virtio_vring_desc_t *id =
476 (vnet_virtio_vring_desc_t *) vlib_buffer_get_current (indirect_desc);
480 d->addr = vlib_physmem_get_pa (vm, id);
481 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
484 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
485 * should be presented in separate descriptor and data will start
486 * from next descriptor.
489 id->len = b->current_length + hdr_sz;
493 id->flags = VRING_DESC_F_NEXT;
497 id->addr = vlib_buffer_get_current_pa (vm, b);
498 id->len = b->current_length;
500 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
502 id->flags = VRING_DESC_F_NEXT;
506 b = vlib_get_buffer (vm, b->next_buffer);
507 id->addr = vlib_buffer_get_current_pa (vm, b);
508 id->len = b->current_length;
509 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
511 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
512 vlib_error_count (vm, node->node_index,
513 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
518 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
520 d->addr = pointer_to_uword (id);
521 /* first buffer in chain */
522 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
523 id->len = b->current_length + hdr_sz;
525 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
527 id->flags = VRING_DESC_F_NEXT;
531 b = vlib_get_buffer (vm, b->next_buffer);
532 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
533 id->len = b->current_length;
534 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
536 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
537 vlib_error_count (vm, node->node_index,
538 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
545 d->len = count * sizeof (vnet_virtio_vring_desc_t);
546 d->flags = VRING_DESC_F_INDIRECT;
551 vlib_buffer_t *b_temp = b;
552 u16 n_buffers_in_chain = 1;
555 * Check the length of the chain for the required number of
556 * descriptors. Return from here, retry to get more descriptors,
557 * if chain length is greater than available descriptors.
559 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
561 n_buffers_in_chain++;
562 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
565 if (n_buffers_in_chain > free_desc_count)
566 return n_buffers_in_chain;
568 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
569 d->len = b->current_length + hdr_sz;
571 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
573 d->flags = VRING_DESC_F_NEXT;
574 vring->buffers[count] = bi;
576 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
580 count = (count + 1) & mask;
582 d = &vring->desc[count];
583 b = vlib_get_buffer (vm, bi);
584 d->addr = vlib_buffer_get_current_pa (vm, b);
585 d->len = b->current_length;
588 vring->buffers[count] = bi;
589 vring->avail->ring[avail & mask] = next;
597 vring->buffers[next] = bi;
598 vring->avail->ring[avail & mask] = next;
602 if (drop_inline != ~0)
603 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
610 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
611 virtio_if_t *vif, vnet_virtio_vring_t *vring,
612 u32 bi, u16 next, int hdr_sz, int do_gso,
613 int csum_offload, int is_pci, int is_tun,
614 int is_indirect, int is_any_layout)
616 u16 n_added = 0, flags = 0;
618 vnet_virtio_vring_packed_desc_t *d = &vring->packed_desc[next];
619 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
620 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
621 u32 drop_inline = ~0;
623 clib_memset (hdr, 0, hdr_sz);
625 if (b->flags & VNET_BUFFER_F_GSO)
628 set_gso_offsets (b, hdr, is_l2);
631 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
635 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
638 set_checksum_offsets (b, hdr, is_l2);
641 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
645 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
647 virtio_tx_trace (vm, node, b, bi, is_tun);
650 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
653 ((is_pci) ? vlib_buffer_get_current_pa (vm,
655 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
656 d->len = b->current_length + hdr_sz;
658 else if (is_indirect)
661 * We are using single vlib_buffer_t for indirect descriptor(s)
662 * chain. Single descriptor is 16 bytes and vlib_buffer_t
663 * has 2048 bytes space. So maximum long chain can have 128
664 * (=2048/16) indirect descriptors.
665 * It can easily support 65535 bytes of Jumbo frames with
666 * each data buffer size of 512 bytes minimum.
668 u32 indirect_buffer = 0;
669 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
671 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
675 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
676 indirect_desc->current_data = 0;
677 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
678 indirect_desc->next_buffer = bi;
679 bi = indirect_buffer;
681 vnet_virtio_vring_packed_desc_t *id =
682 (vnet_virtio_vring_packed_desc_t *) vlib_buffer_get_current (
687 d->addr = vlib_physmem_get_pa (vm, id);
688 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
691 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
692 * should be presented in separate descriptor and data will start
693 * from next descriptor.
696 id->len = b->current_length + hdr_sz;
704 id->addr = vlib_buffer_get_current_pa (vm, b);
705 id->len = b->current_length;
707 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
713 b = vlib_get_buffer (vm, b->next_buffer);
714 id->addr = vlib_buffer_get_current_pa (vm, b);
715 id->len = b->current_length;
716 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
718 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
719 vlib_error_count (vm, node->node_index,
720 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
727 d->len = count * sizeof (vnet_virtio_vring_packed_desc_t);
728 flags = VRING_DESC_F_INDIRECT;
734 if (vring->avail_wrap_counter)
736 flags |= VRING_DESC_F_AVAIL;
737 flags &= ~VRING_DESC_F_USED;
741 flags &= ~VRING_DESC_F_AVAIL;
742 flags |= VRING_DESC_F_USED;
747 vring->buffers[next] = bi;
751 if (drop_inline != ~0)
752 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
759 virtio_interface_tx_packed_gso_inline (
760 vlib_main_t *vm, vlib_node_runtime_t *node, virtio_if_t *vif,
761 virtio_if_type_t type, vnet_virtio_vring_t *vring, u32 *buffers, u16 n_left,
762 const int do_gso, const int csum_offload)
764 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
765 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
767 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
769 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
770 const int hdr_sz = vif->virtio_net_hdr_sz;
771 u16 sz = vring->queue_size;
772 u16 used, next, n_buffers = 0, n_buffers_left = 0;
773 u16 n_vectors = n_left;
776 used = vring->desc_in_use;
777 next = vring->desc_next;
779 if (vif->packet_buffering)
781 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
783 while (n_buffers_left && used < sz)
787 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
790 n_added = add_buffer_to_slot_packed (
791 vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
792 is_pci, is_tun, is_indirect, is_any_layout);
794 if (PREDICT_FALSE (n_added == 0))
802 vring->avail_wrap_counter ^= 1;
805 virtio_txq_clear_scheduled (vring);
808 while (n_left && used < sz)
812 n_added = add_buffer_to_slot_packed (
813 vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
814 is_pci, is_tun, is_indirect, is_any_layout);
817 if (PREDICT_FALSE (n_added == 0))
825 vring->avail_wrap_counter ^= 1;
829 if (n_left != n_vectors || n_buffers != n_buffers_left)
831 CLIB_MEMORY_STORE_BARRIER ();
832 vring->desc_next = next;
833 vring->desc_in_use = used;
834 CLIB_MEMORY_BARRIER ();
835 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
836 virtio_kick (vm, vring, vif);
843 virtio_find_free_desc (vnet_virtio_vring_t *vring, u16 size, u16 mask, u16 req,
844 u16 next, u32 *first_free_desc_index,
845 u16 *free_desc_count)
848 /* next is used as hint: from where to start looking */
849 for (u16 i = 0; i < size; i++, next++)
851 if (vring->buffers[next & mask] == ~0)
853 if (*first_free_desc_index == ~0)
855 *first_free_desc_index = (next & mask);
857 (*free_desc_count)++;
864 if (start + *free_desc_count == i)
866 (*free_desc_count)++;
879 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
880 vlib_node_runtime_t *node,
881 virtio_if_t *vif, virtio_if_type_t type,
882 vnet_virtio_vring_t *vring, u32 *buffers,
883 u16 n_left, int do_gso, int csum_offload)
885 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
886 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
887 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
889 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
891 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
892 u16 sz = vring->queue_size;
893 int hdr_sz = vif->virtio_net_hdr_sz;
895 u16 n_vectors = n_left;
897 used = vring->desc_in_use;
898 next = vring->desc_next;
899 avail = vring->avail->idx;
901 u16 free_desc_count = 0;
903 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
905 u32 first_free_desc_index = ~0;
907 virtio_find_free_desc (vring, sz, mask, n_left, next,
908 &first_free_desc_index, &free_desc_count);
911 next = first_free_desc_index;
914 free_desc_count = sz - used;
916 if (vif->packet_buffering)
918 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
920 while (n_buffers_left && free_desc_count)
924 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
928 n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
929 free_desc_count, avail, next, mask,
930 hdr_sz, do_gso, csum_offload, is_pci,
931 is_tun, is_indirect, is_any_layout);
932 if (PREDICT_FALSE (n_added == 0))
937 else if (PREDICT_FALSE (n_added > free_desc_count))
941 next = (next + n_added) & mask;
944 free_desc_count -= n_added;
946 virtio_txq_clear_scheduled (vring);
949 while (n_left && free_desc_count)
954 add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
955 avail, next, mask, hdr_sz, do_gso, csum_offload,
956 is_pci, is_tun, is_indirect, is_any_layout);
958 if (PREDICT_FALSE (n_added == 0))
964 else if (PREDICT_FALSE (n_added > free_desc_count))
968 next = (next + n_added) & mask;
972 free_desc_count -= n_added;
975 if (n_left != n_vectors || n_buffers != n_buffers_left)
977 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
978 vring->desc_next = next;
979 vring->desc_in_use = used;
980 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
981 VRING_USED_F_NO_NOTIFY) == 0)
982 virtio_kick (vm, vring, vif);
989 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
990 virtio_if_t *vif, virtio_if_type_t type,
991 vnet_virtio_vring_t *vring, u32 *buffers,
992 u16 n_left, int packed, int do_gso,
996 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
998 do_gso, csum_offload);
1000 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
1002 do_gso, csum_offload);
1006 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1007 virtio_if_t *vif, vnet_virtio_vring_t *vring,
1008 virtio_if_type_t type, u32 *buffers, u16 n_left,
1011 vnet_main_t *vnm = vnet_get_main ();
1012 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
1014 if (hw->caps & VNET_HW_IF_CAP_TCP_GSO)
1015 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1016 buffers, n_left, packed,
1018 1 /* checksum offload */ );
1019 else if (hw->caps & VNET_HW_IF_CAP_L4_TX_CKSUM)
1020 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1021 buffers, n_left, packed,
1023 1 /* checksum offload */ );
1025 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1026 buffers, n_left, packed,
1028 0 /* no checksum offload */ );
1031 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1032 vlib_node_runtime_t * node,
1033 vlib_frame_t * frame)
1035 virtio_main_t *nm = &virtio_main;
1036 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1037 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1038 vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
1039 u16 qid = tf->queue_id;
1040 vnet_virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1041 u16 n_left = frame->n_vectors;
1042 u32 *buffers = vlib_frame_vector_args (frame);
1043 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1044 int packed = vif->is_packed;
1045 u16 n_vectors = frame->n_vectors;
1047 if (tf->shared_queue)
1048 clib_spinlock_lock (&vring->lockp);
1050 if (vif->packet_coalesce)
1052 n_vectors = n_left =
1053 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1055 virtio_txq_clear_scheduled (vring);
1058 u16 retry_count = 2;
1061 /* free consumed buffers */
1062 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1064 if (vif->type == VIRTIO_IF_TYPE_TAP)
1065 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1067 &buffers[n_vectors - n_left],
1069 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1070 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1072 &buffers[n_vectors - n_left],
1074 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1075 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1077 &buffers[n_vectors - n_left],
1082 if (n_left && retry_count--)
1085 if (vif->packet_buffering && n_left)
1087 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1092 n_left -= n_buffered;
1095 virtio_interface_drop_inline (vm, vif, node->node_index,
1096 &buffers[n_vectors - n_left], n_left,
1097 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1099 if (tf->shared_queue)
1100 clib_spinlock_unlock (&vring->lockp);
1102 return frame->n_vectors - n_left;
1106 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1109 virtio_main_t *apm = &virtio_main;
1110 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1111 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1113 /* Shut off redirection */
1114 if (node_index == ~0)
1116 vif->per_interface_next_index = node_index;
1120 vif->per_interface_next_index =
1121 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1126 virtio_clear_hw_interface_counters (u32 instance)
1128 /* Nothing for now */
1132 virtio_set_rx_interrupt (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1135 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1137 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1141 virtio_set_rx_polling (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1144 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1146 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1149 static clib_error_t *
1150 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1151 vnet_hw_if_rx_mode mode)
1153 virtio_main_t *mm = &virtio_main;
1154 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1155 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1156 vnet_virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1158 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1160 virtio_set_rx_polling (vif, rx_vring);
1161 return clib_error_return (0, "interrupt mode is not supported");
1164 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1165 virtio_set_rx_polling (vif, rx_vring);
1167 virtio_set_rx_interrupt (vif, rx_vring);
1169 rx_vring->mode = mode;
1174 static clib_error_t *
1175 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1177 virtio_main_t *mm = &virtio_main;
1178 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1179 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1181 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1183 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1184 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1185 VNET_HW_INTERFACE_FLAG_LINK_UP);
1189 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1190 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1195 static clib_error_t *
1196 virtio_subif_add_del_function (vnet_main_t * vnm,
1198 struct vnet_sw_interface_t *st, int is_add)
1200 /* Nothing for now */
1205 VNET_DEVICE_CLASS (virtio_device_class) = {
1207 .format_device_name = format_virtio_device_name,
1208 .format_device = format_virtio_device,
1209 .format_tx_trace = format_virtio_tx_trace,
1210 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1211 .tx_function_error_strings = virtio_tx_func_error_strings,
1212 .rx_redirect_to_node = virtio_set_interface_next_node,
1213 .clear_counters = virtio_clear_hw_interface_counters,
1214 .admin_up_down_function = virtio_interface_admin_up_down,
1215 .subif_add_del_function = virtio_subif_add_del_function,
1216 .rx_mode_change_function = virtio_interface_rx_mode_change,
1222 * fd.io coding-style-patch-verification: ON
1225 * eval: (c-set-style "gnu")