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;
112 clib_memset (&t->gho, 0, sizeof (t->gho));
115 int is_ip4 = 0, is_ip6 = 0;
117 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
128 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
131 vnet_generic_header_offset_parser (b0, &t->gho, 1,
133 VNET_BUFFER_F_IS_IP4,
134 b0->flags & VNET_BUFFER_F_IS_IP6);
136 clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
137 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
138 sizeof (t->buffer.pre_data));
142 virtio_interface_drop_inline (vlib_main_t *vm, virtio_if_t *vif,
143 uword node_index, u32 *buffers, u16 n,
144 virtio_tx_func_error_t error)
146 vlib_error_count (vm, node_index, error, n);
147 vlib_increment_simple_counter (vnet_main.interface_main.sw_if_counters +
148 VNET_INTERFACE_COUNTER_DROP,
149 vm->thread_index, vif->sw_if_index, n);
150 vlib_buffer_free (vm, buffers, n);
154 virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
156 ASSERT (n_buffers <= ring_size);
158 if (PREDICT_TRUE (start + n_buffers <= ring_size))
160 clib_memset_u32 (ring + start, ~0, n_buffers);
164 clib_memset_u32 (ring + start, ~0, ring_size - start);
165 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
170 virtio_free_used_device_desc_split (vlib_main_t *vm,
171 vnet_virtio_vring_t *vring,
174 u16 used = vring->desc_in_use;
175 u16 sz = vring->queue_size;
177 u16 last = vring->last_used_idx;
178 u16 n_left = vring->used->idx - last;
179 u16 out_of_order_count = 0;
186 vnet_virtio_vring_used_elem_t *e = &vring->used->ring[last & mask];
188 slot = n_buffers = e->id;
190 while (e->id == (n_buffers & mask))
195 vnet_virtio_vring_desc_t *d = &vring->desc[e->id];
197 while (d->flags & VRING_DESC_F_NEXT)
201 d = &vring->desc[next];
205 e = &vring->used->ring[last & mask];
207 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
208 sz, (n_buffers - slot));
209 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
210 used -= (n_buffers - slot);
214 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
215 vring->buffers[e->id] = ~0;
219 out_of_order_count++;
220 vring->flags |= VRING_TX_OUT_OF_ORDER;
225 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
226 * It impacts the overall virtio-performance.
228 if (out_of_order_count)
229 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
232 vring->desc_in_use = used;
233 vring->last_used_idx = last;
237 virtio_free_used_device_desc_packed (vlib_main_t *vm,
238 vnet_virtio_vring_t *vring,
241 vnet_virtio_vring_packed_desc_t *d;
242 u16 sz = vring->queue_size;
243 u16 last = vring->last_used_idx;
244 u16 n_buffers = 0, start;
247 if (vring->desc_in_use == 0)
250 d = &vring->packed_desc[last];
254 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
255 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
263 vring->used_wrap_counter ^= 1;
265 d = &vring->packed_desc[last];
271 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
272 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
273 vring->desc_in_use -= n_buffers;
274 vring->last_used_idx = last;
279 virtio_free_used_device_desc (vlib_main_t *vm, vnet_virtio_vring_t *vring,
280 uword node_index, int packed)
283 virtio_free_used_device_desc_packed (vm, vring, node_index);
285 virtio_free_used_device_desc_split (vm, vring, node_index);
290 set_checksum_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
293 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
295 if (b->flags & VNET_BUFFER_F_IS_IP4)
298 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
299 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x22;
302 * virtio devices do not support IP4 checksum offload. So driver takes
303 * care of it while doing tx.
305 ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
306 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
307 ip4->checksum = ip4_header_checksum (ip4);
310 * virtio devices assume the l4 header is set to the checksum of the
311 * l3 pseudo-header, so we compute it before tx-ing
313 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
316 (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
317 tcp->checksum = ip4_pseudo_header_cksum (ip4);
318 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
320 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
323 (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
324 udp->checksum = ip4_pseudo_header_cksum (ip4);
325 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
328 else if (b->flags & VNET_BUFFER_F_IS_IP6)
331 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
332 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x36;
333 ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
336 * virtio devices assume the l4 header is set to the checksum of the
337 * l3 pseudo-header, so we compute it before tx-ing
339 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
342 (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
343 tcp->checksum = ip6_pseudo_header_cksum (ip6);
344 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
346 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
349 (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
350 udp->checksum = ip6_pseudo_header_cksum (ip6);
351 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
357 set_gso_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
360 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
362 if (b->flags & VNET_BUFFER_F_IS_IP4)
365 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
366 hdr->gso_size = vnet_buffer2 (b)->gso_size;
367 hdr->hdr_len = vnet_buffer (b)->l4_hdr_offset -
368 vnet_buffer (b)->l2_hdr_offset +
369 vnet_buffer2 (b)->gso_l4_hdr_sz;
370 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
371 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x22;
372 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
373 ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
375 * virtio devices do not support IP4 checksum offload. So driver takes care
376 * of it while doing tx.
378 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
379 ip4->checksum = ip4_header_checksum (ip4);
381 else if (b->flags & VNET_BUFFER_F_IS_IP6)
383 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
384 hdr->gso_size = vnet_buffer2 (b)->gso_size;
385 hdr->hdr_len = vnet_buffer (b)->l4_hdr_offset -
386 vnet_buffer (b)->l2_hdr_offset +
387 vnet_buffer2 (b)->gso_l4_hdr_sz;
388 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
389 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x36;
390 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
395 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
396 virtio_if_t *vif, vnet_virtio_vring_t *vring, u32 bi,
397 u16 free_desc_count, u16 avail, u16 next, u16 mask,
398 int hdr_sz, int do_gso, int csum_offload, int is_pci,
399 int is_tun, int is_indirect, int is_any_layout)
402 vnet_virtio_vring_desc_t *d;
404 d = &vring->desc[next];
405 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
406 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
407 u32 drop_inline = ~0;
409 clib_memset_u8 (hdr, 0, hdr_sz);
411 if (b->flags & VNET_BUFFER_F_GSO)
414 set_gso_offsets (b, hdr, is_l2);
417 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
421 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
424 set_checksum_offsets (b, hdr, is_l2);
427 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
432 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
434 virtio_tx_trace (vm, node, b, bi, is_tun);
437 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
439 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
440 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
441 d->len = b->current_length + hdr_sz;
444 else if (is_indirect)
447 * We are using single vlib_buffer_t for indirect descriptor(s)
448 * chain. Single descriptor is 16 bytes and vlib_buffer_t
449 * has 2048 bytes space. So maximum long chain can have 128
450 * (=2048/16) indirect descriptors.
451 * It can easily support 65535 bytes of Jumbo frames with
452 * each data buffer size of 512 bytes minimum.
454 u32 indirect_buffer = 0;
455 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
457 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
461 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
462 indirect_desc->current_data = 0;
463 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
464 indirect_desc->next_buffer = bi;
465 bi = indirect_buffer;
467 vnet_virtio_vring_desc_t *id =
468 (vnet_virtio_vring_desc_t *) vlib_buffer_get_current (indirect_desc);
472 d->addr = vlib_physmem_get_pa (vm, id);
473 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
476 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
477 * should be presented in separate descriptor and data will start
478 * from next descriptor.
481 id->len = b->current_length + hdr_sz;
485 id->flags = VRING_DESC_F_NEXT;
489 id->addr = vlib_buffer_get_current_pa (vm, b);
490 id->len = b->current_length;
492 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
494 id->flags = VRING_DESC_F_NEXT;
498 b = vlib_get_buffer (vm, b->next_buffer);
499 id->addr = vlib_buffer_get_current_pa (vm, b);
500 id->len = b->current_length;
501 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
503 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
504 vlib_error_count (vm, node->node_index,
505 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
510 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
512 d->addr = pointer_to_uword (id);
513 /* first buffer in chain */
514 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
515 id->len = b->current_length + hdr_sz;
517 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
519 id->flags = VRING_DESC_F_NEXT;
523 b = vlib_get_buffer (vm, b->next_buffer);
524 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
525 id->len = b->current_length;
526 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
528 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
529 vlib_error_count (vm, node->node_index,
530 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
537 d->len = count * sizeof (vnet_virtio_vring_desc_t);
538 d->flags = VRING_DESC_F_INDIRECT;
543 vlib_buffer_t *b_temp = b;
544 u16 n_buffers_in_chain = 1;
547 * Check the length of the chain for the required number of
548 * descriptors. Return from here, retry to get more descriptors,
549 * if chain length is greater than available descriptors.
551 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
553 n_buffers_in_chain++;
554 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
557 if (n_buffers_in_chain > free_desc_count)
558 return n_buffers_in_chain;
560 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
561 d->len = b->current_length + hdr_sz;
563 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
565 d->flags = VRING_DESC_F_NEXT;
566 vring->buffers[count] = bi;
568 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
572 count = (count + 1) & mask;
574 d = &vring->desc[count];
575 b = vlib_get_buffer (vm, bi);
576 d->addr = vlib_buffer_get_current_pa (vm, b);
577 d->len = b->current_length;
580 vring->buffers[count] = bi;
581 vring->avail->ring[avail & mask] = next;
589 vring->buffers[next] = bi;
590 vring->avail->ring[avail & mask] = next;
594 if (drop_inline != ~0)
595 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
602 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
603 virtio_if_t *vif, vnet_virtio_vring_t *vring,
604 u32 bi, u16 next, int hdr_sz, int do_gso,
605 int csum_offload, int is_pci, int is_tun,
606 int is_indirect, int is_any_layout)
608 u16 n_added = 0, flags = 0;
610 vnet_virtio_vring_packed_desc_t *d = &vring->packed_desc[next];
611 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
612 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
613 u32 drop_inline = ~0;
615 clib_memset (hdr, 0, hdr_sz);
617 if (b->flags & VNET_BUFFER_F_GSO)
620 set_gso_offsets (b, hdr, is_l2);
623 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
627 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
630 set_checksum_offsets (b, hdr, is_l2);
633 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
637 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
639 virtio_tx_trace (vm, node, b, bi, is_tun);
642 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
645 ((is_pci) ? vlib_buffer_get_current_pa (vm,
647 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
648 d->len = b->current_length + hdr_sz;
650 else if (is_indirect)
653 * We are using single vlib_buffer_t for indirect descriptor(s)
654 * chain. Single descriptor is 16 bytes and vlib_buffer_t
655 * has 2048 bytes space. So maximum long chain can have 128
656 * (=2048/16) indirect descriptors.
657 * It can easily support 65535 bytes of Jumbo frames with
658 * each data buffer size of 512 bytes minimum.
660 u32 indirect_buffer = 0;
661 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
663 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
667 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
668 indirect_desc->current_data = 0;
669 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
670 indirect_desc->next_buffer = bi;
671 bi = indirect_buffer;
673 vnet_virtio_vring_packed_desc_t *id =
674 (vnet_virtio_vring_packed_desc_t *) vlib_buffer_get_current (
679 d->addr = vlib_physmem_get_pa (vm, id);
680 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
683 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
684 * should be presented in separate descriptor and data will start
685 * from next descriptor.
688 id->len = b->current_length + hdr_sz;
696 id->addr = vlib_buffer_get_current_pa (vm, b);
697 id->len = b->current_length;
699 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
705 b = vlib_get_buffer (vm, b->next_buffer);
706 id->addr = vlib_buffer_get_current_pa (vm, b);
707 id->len = b->current_length;
708 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
710 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
711 vlib_error_count (vm, node->node_index,
712 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
719 d->len = count * sizeof (vnet_virtio_vring_packed_desc_t);
720 flags = VRING_DESC_F_INDIRECT;
726 if (vring->avail_wrap_counter)
728 flags |= VRING_DESC_F_AVAIL;
729 flags &= ~VRING_DESC_F_USED;
733 flags &= ~VRING_DESC_F_AVAIL;
734 flags |= VRING_DESC_F_USED;
739 vring->buffers[next] = bi;
743 if (drop_inline != ~0)
744 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
751 virtio_interface_tx_packed_gso_inline (
752 vlib_main_t *vm, vlib_node_runtime_t *node, virtio_if_t *vif,
753 virtio_if_type_t type, vnet_virtio_vring_t *vring, u32 *buffers, u16 n_left,
754 const int do_gso, const int csum_offload)
756 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
757 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
759 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
761 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
762 const int hdr_sz = vif->virtio_net_hdr_sz;
763 u16 sz = vring->queue_size;
764 u16 used, next, n_buffers = 0, n_buffers_left = 0;
765 u16 n_vectors = n_left;
768 used = vring->desc_in_use;
769 next = vring->desc_next;
771 if (vif->packet_buffering)
773 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
775 while (n_buffers_left && used < sz)
779 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
782 n_added = add_buffer_to_slot_packed (
783 vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
784 is_pci, is_tun, is_indirect, is_any_layout);
786 if (PREDICT_FALSE (n_added == 0))
794 vring->avail_wrap_counter ^= 1;
797 virtio_txq_clear_scheduled (vring);
800 while (n_left && used < sz)
804 n_added = add_buffer_to_slot_packed (
805 vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
806 is_pci, is_tun, is_indirect, is_any_layout);
809 if (PREDICT_FALSE (n_added == 0))
817 vring->avail_wrap_counter ^= 1;
821 if (n_left != n_vectors || n_buffers != n_buffers_left)
823 CLIB_MEMORY_STORE_BARRIER ();
824 vring->desc_next = next;
825 vring->desc_in_use = used;
826 CLIB_MEMORY_BARRIER ();
827 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
828 virtio_kick (vm, vring, vif);
835 virtio_find_free_desc (vnet_virtio_vring_t *vring, u16 size, u16 mask, u16 req,
836 u16 next, u32 *first_free_desc_index,
837 u16 *free_desc_count)
840 /* next is used as hint: from where to start looking */
841 for (u16 i = 0; i < size; i++, next++)
843 if (vring->buffers[next & mask] == ~0)
845 if (*first_free_desc_index == ~0)
847 *first_free_desc_index = (next & mask);
849 (*free_desc_count)++;
856 if (start + *free_desc_count == i)
858 (*free_desc_count)++;
871 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
872 vlib_node_runtime_t *node,
873 virtio_if_t *vif, virtio_if_type_t type,
874 vnet_virtio_vring_t *vring, u32 *buffers,
875 u16 n_left, int do_gso, int csum_offload)
877 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
878 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
879 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
881 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
883 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
884 u16 sz = vring->queue_size;
885 int hdr_sz = vif->virtio_net_hdr_sz;
887 u16 n_vectors = n_left;
889 used = vring->desc_in_use;
890 next = vring->desc_next;
891 avail = vring->avail->idx;
893 u16 free_desc_count = 0;
895 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
897 u32 first_free_desc_index = ~0;
899 virtio_find_free_desc (vring, sz, mask, n_left, next,
900 &first_free_desc_index, &free_desc_count);
903 next = first_free_desc_index;
906 free_desc_count = sz - used;
908 if (vif->packet_buffering)
910 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
912 while (n_buffers_left && free_desc_count)
916 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
920 n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
921 free_desc_count, avail, next, mask,
922 hdr_sz, do_gso, csum_offload, is_pci,
923 is_tun, is_indirect, is_any_layout);
924 if (PREDICT_FALSE (n_added == 0))
929 else if (PREDICT_FALSE (n_added > free_desc_count))
933 next = (next + n_added) & mask;
936 free_desc_count -= n_added;
938 virtio_txq_clear_scheduled (vring);
941 while (n_left && free_desc_count)
946 add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
947 avail, next, mask, hdr_sz, do_gso, csum_offload,
948 is_pci, is_tun, is_indirect, is_any_layout);
950 if (PREDICT_FALSE (n_added == 0))
956 else if (PREDICT_FALSE (n_added > free_desc_count))
960 next = (next + n_added) & mask;
964 free_desc_count -= n_added;
967 if (n_left != n_vectors || n_buffers != n_buffers_left)
969 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
970 vring->desc_next = next;
971 vring->desc_in_use = used;
972 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
973 VRING_USED_F_NO_NOTIFY) == 0)
974 virtio_kick (vm, vring, vif);
981 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
982 virtio_if_t *vif, virtio_if_type_t type,
983 vnet_virtio_vring_t *vring, u32 *buffers,
984 u16 n_left, int packed, int do_gso,
988 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
990 do_gso, csum_offload);
992 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
994 do_gso, csum_offload);
998 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
999 virtio_if_t *vif, vnet_virtio_vring_t *vring,
1000 virtio_if_type_t type, u32 *buffers, u16 n_left,
1003 vnet_main_t *vnm = vnet_get_main ();
1004 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
1006 if (hw->caps & VNET_HW_IF_CAP_TCP_GSO)
1007 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1008 buffers, n_left, packed,
1010 1 /* checksum offload */ );
1011 else if (hw->caps & VNET_HW_IF_CAP_L4_TX_CKSUM)
1012 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1013 buffers, n_left, packed,
1015 1 /* checksum offload */ );
1017 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1018 buffers, n_left, packed,
1020 0 /* no checksum offload */ );
1023 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1024 vlib_node_runtime_t * node,
1025 vlib_frame_t * frame)
1027 virtio_main_t *nm = &virtio_main;
1028 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1029 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1030 vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
1031 u16 qid = tf->queue_id;
1032 vnet_virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1033 u16 n_left = frame->n_vectors;
1034 u32 *buffers = vlib_frame_vector_args (frame);
1035 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1036 int packed = vif->is_packed;
1037 u16 n_vectors = frame->n_vectors;
1039 if (tf->shared_queue)
1040 clib_spinlock_lock (&vring->lockp);
1042 if (vif->packet_coalesce)
1044 n_vectors = n_left =
1045 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1047 virtio_txq_clear_scheduled (vring);
1050 u16 retry_count = 2;
1053 /* free consumed buffers */
1054 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1056 if (vif->type == VIRTIO_IF_TYPE_TAP)
1057 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1059 &buffers[n_vectors - n_left],
1061 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1062 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1064 &buffers[n_vectors - n_left],
1066 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1067 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1069 &buffers[n_vectors - n_left],
1074 if (n_left && retry_count--)
1077 if (vif->packet_buffering && n_left)
1079 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1084 n_left -= n_buffered;
1087 virtio_interface_drop_inline (vm, vif, node->node_index,
1088 &buffers[n_vectors - n_left], n_left,
1089 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1091 if (tf->shared_queue)
1092 clib_spinlock_unlock (&vring->lockp);
1094 return frame->n_vectors - n_left;
1098 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1101 virtio_main_t *apm = &virtio_main;
1102 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1103 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1105 /* Shut off redirection */
1106 if (node_index == ~0)
1108 vif->per_interface_next_index = node_index;
1112 vif->per_interface_next_index =
1113 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1118 virtio_clear_hw_interface_counters (u32 instance)
1120 /* Nothing for now */
1124 virtio_set_rx_interrupt (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1127 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1129 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1133 virtio_set_rx_polling (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1136 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1138 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1141 static clib_error_t *
1142 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1143 vnet_hw_if_rx_mode mode)
1145 virtio_main_t *mm = &virtio_main;
1146 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1147 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1148 vnet_virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1150 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1152 virtio_set_rx_polling (vif, rx_vring);
1153 return clib_error_return (0, "interrupt mode is not supported");
1156 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1157 virtio_set_rx_polling (vif, rx_vring);
1159 virtio_set_rx_interrupt (vif, rx_vring);
1161 rx_vring->mode = mode;
1166 static clib_error_t *
1167 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1169 virtio_main_t *mm = &virtio_main;
1170 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1171 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1173 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1175 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1176 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1177 VNET_HW_INTERFACE_FLAG_LINK_UP);
1181 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1182 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1187 static clib_error_t *
1188 virtio_subif_add_del_function (vnet_main_t * vnm,
1190 struct vnet_sw_interface_t *st, int is_add)
1192 /* Nothing for now */
1197 VNET_DEVICE_CLASS (virtio_device_class) = {
1199 .format_device_name = format_virtio_device_name,
1200 .format_device = format_virtio_device,
1201 .format_tx_trace = format_virtio_tx_trace,
1202 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1203 .tx_function_error_strings = virtio_tx_func_error_strings,
1204 .rx_redirect_to_node = virtio_set_interface_next_node,
1205 .clear_counters = virtio_clear_hw_interface_counters,
1206 .admin_up_down_function = virtio_interface_admin_up_down,
1207 .subif_add_del_function = virtio_subif_add_del_function,
1208 .rx_mode_change_function = virtio_interface_rx_mode_change,
1214 * fd.io coding-style-patch-verification: ON
1217 * eval: (c-set-style "gnu")