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);
66 virtio_main_t *vim = &virtio_main;
67 virtio_if_t *vif = vec_elt_at_index (vim->interfaces, dev_instance);
68 vnet_virtio_vring_t *vring = 0;
70 s = format (s, "VIRTIO interface");
73 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
75 s = format (s, "\n%U RX QUEUE : Total Packets", format_white_space,
77 vec_foreach (vring, vif->rxq_vrings)
79 s = format (s, "\n%U %8u : %llu", format_white_space, indent + 4,
80 RX_QUEUE_ACCESS (vring->queue_id), vring->total_packets);
82 s = format (s, "\n%U TX QUEUE : Total Packets", format_white_space,
84 vec_foreach (vring, vif->txq_vrings)
86 s = format (s, "\n%U %8u : %llu", format_white_space, indent + 4,
87 TX_QUEUE_ACCESS (vring->queue_id), vring->total_packets);
98 generic_header_offset_t gho;
103 format_virtio_tx_trace (u8 * s, va_list * va)
105 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
106 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
107 virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
108 u32 indent = format_get_indent (s);
110 s = format (s, "%Ubuffer 0x%x: %U\n", format_white_space, indent,
111 t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
113 format (s, "%U%U\n", format_white_space, indent,
114 format_generic_header_offset, &t->gho);
116 format (s, "%U%U", format_white_space, indent,
117 format_ethernet_header_with_length, t->buffer.pre_data,
118 sizeof (t->buffer.pre_data));
123 virtio_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b0,
126 virtio_tx_trace_t *t;
127 t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
128 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
129 t->buffer_index = bi;
130 clib_memset (&t->gho, 0, sizeof (t->gho));
133 int is_ip4 = 0, is_ip6 = 0;
135 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
146 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
149 vnet_generic_header_offset_parser (b0, &t->gho, 1,
151 VNET_BUFFER_F_IS_IP4,
152 b0->flags & VNET_BUFFER_F_IS_IP6);
154 clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
155 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
156 sizeof (t->buffer.pre_data));
160 virtio_interface_drop_inline (vlib_main_t *vm, virtio_if_t *vif,
161 uword node_index, u32 *buffers, u16 n,
162 virtio_tx_func_error_t error)
164 vlib_error_count (vm, node_index, error, n);
165 vlib_increment_simple_counter (vnet_main.interface_main.sw_if_counters +
166 VNET_INTERFACE_COUNTER_DROP,
167 vm->thread_index, vif->sw_if_index, n);
168 vlib_buffer_free (vm, buffers, n);
172 virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
174 ASSERT (n_buffers <= ring_size);
176 if (PREDICT_TRUE (start + n_buffers <= ring_size))
178 clib_memset_u32 (ring + start, ~0, n_buffers);
182 clib_memset_u32 (ring + start, ~0, ring_size - start);
183 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
188 virtio_free_used_device_desc_split (vlib_main_t *vm,
189 vnet_virtio_vring_t *vring,
192 u16 used = vring->desc_in_use;
193 u16 sz = vring->queue_size;
195 u16 last = vring->last_used_idx;
196 u16 n_left = vring->used->idx - last;
197 u16 out_of_order_count = 0;
204 vnet_virtio_vring_used_elem_t *e = &vring->used->ring[last & mask];
206 slot = n_buffers = e->id;
208 while (e->id == (n_buffers & mask))
213 vnet_virtio_vring_desc_t *d = &vring->desc[e->id];
215 while (d->flags & VRING_DESC_F_NEXT)
219 d = &vring->desc[next];
223 e = &vring->used->ring[last & mask];
225 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
226 sz, (n_buffers - slot));
227 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
228 used -= (n_buffers - slot);
232 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
233 vring->buffers[e->id] = ~0;
237 out_of_order_count++;
238 vring->flags |= VRING_TX_OUT_OF_ORDER;
243 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
244 * It impacts the overall virtio-performance.
246 if (out_of_order_count)
247 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
250 vring->desc_in_use = used;
251 vring->last_used_idx = last;
255 virtio_free_used_device_desc_packed (vlib_main_t *vm,
256 vnet_virtio_vring_t *vring,
259 vnet_virtio_vring_packed_desc_t *d;
260 u16 sz = vring->queue_size;
261 u16 last = vring->last_used_idx;
262 u16 n_buffers = 0, start;
265 if (vring->desc_in_use == 0)
268 d = &vring->packed_desc[last];
272 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
273 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
281 vring->used_wrap_counter ^= 1;
283 d = &vring->packed_desc[last];
289 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
290 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
291 vring->desc_in_use -= n_buffers;
292 vring->last_used_idx = last;
297 virtio_free_used_device_desc (vlib_main_t *vm, vnet_virtio_vring_t *vring,
298 uword node_index, int packed)
301 virtio_free_used_device_desc_packed (vm, vring, node_index);
303 virtio_free_used_device_desc_split (vm, vring, node_index);
308 set_checksum_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
311 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
313 vnet_buffer (b)->l4_hdr_offset - vnet_buffer (b)->l2_hdr_offset;
314 if (b->flags & VNET_BUFFER_F_IS_IP4)
317 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
318 hdr->csum_start = l4_hdr_offset; // 0x22;
321 * virtio devices do not support IP4 checksum offload. So driver takes
322 * care of it while doing tx.
324 ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
325 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
326 ip4->checksum = ip4_header_checksum (ip4);
329 * virtio devices assume the l4 header is set to the checksum of the
330 * l3 pseudo-header, so we compute it before tx-ing
332 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
335 (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
336 tcp->checksum = ip4_pseudo_header_cksum (ip4);
337 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
339 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
342 (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
343 udp->checksum = ip4_pseudo_header_cksum (ip4);
344 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
347 else if (b->flags & VNET_BUFFER_F_IS_IP6)
350 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
351 hdr->csum_start = l4_hdr_offset; // 0x36;
352 ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
355 * virtio devices assume the l4 header is set to the checksum of the
356 * l3 pseudo-header, so we compute it before tx-ing
358 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
361 (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
362 tcp->checksum = ip6_pseudo_header_cksum (ip6);
363 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
365 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
368 (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
369 udp->checksum = ip6_pseudo_header_cksum (ip6);
370 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
376 set_gso_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
379 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
381 vnet_buffer (b)->l4_hdr_offset - vnet_buffer (b)->l2_hdr_offset;
383 if (b->flags & VNET_BUFFER_F_IS_IP4)
386 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
387 hdr->gso_size = vnet_buffer2 (b)->gso_size;
388 hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b)->gso_l4_hdr_sz;
389 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
390 hdr->csum_start = l4_hdr_offset; // 0x22;
391 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
392 ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
394 * virtio devices do not support IP4 checksum offload. So driver takes care
395 * of it while doing tx.
397 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
398 ip4->checksum = ip4_header_checksum (ip4);
400 else if (b->flags & VNET_BUFFER_F_IS_IP6)
402 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
403 hdr->gso_size = vnet_buffer2 (b)->gso_size;
404 hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b)->gso_l4_hdr_sz;
405 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
406 hdr->csum_start = l4_hdr_offset; // 0x36;
407 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
412 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
413 virtio_if_t *vif, vnet_virtio_vring_t *vring, u32 bi,
414 u16 free_desc_count, u16 avail, u16 next, u16 mask,
415 int hdr_sz, int do_gso, int csum_offload, int is_pci,
416 int is_tun, int is_indirect, int is_any_layout)
419 vnet_virtio_vring_desc_t *d;
421 d = &vring->desc[next];
422 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
423 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
424 u32 drop_inline = ~0;
426 clib_memset_u8 (hdr, 0, hdr_sz);
428 vring->total_packets++;
429 if (b->flags & VNET_BUFFER_F_GSO)
432 set_gso_offsets (b, hdr, is_l2);
435 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
439 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
442 set_checksum_offsets (b, hdr, is_l2);
445 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
450 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
452 virtio_tx_trace (vm, node, b, bi, is_tun);
455 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
457 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
458 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
459 d->len = b->current_length + hdr_sz;
462 else if (is_indirect)
465 * We are using single vlib_buffer_t for indirect descriptor(s)
466 * chain. Single descriptor is 16 bytes and vlib_buffer_t
467 * has 2048 bytes space. So maximum long chain can have 128
468 * (=2048/16) indirect descriptors.
469 * It can easily support 65535 bytes of Jumbo frames with
470 * each data buffer size of 512 bytes minimum.
472 u32 indirect_buffer = 0;
473 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
475 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
479 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
480 indirect_desc->current_data = 0;
481 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
482 indirect_desc->next_buffer = bi;
483 bi = indirect_buffer;
485 vnet_virtio_vring_desc_t *id =
486 (vnet_virtio_vring_desc_t *) vlib_buffer_get_current (indirect_desc);
490 d->addr = vlib_physmem_get_pa (vm, id);
491 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
494 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
495 * should be presented in separate descriptor and data will start
496 * from next descriptor.
499 id->len = b->current_length + hdr_sz;
503 id->flags = VRING_DESC_F_NEXT;
507 id->addr = vlib_buffer_get_current_pa (vm, b);
508 id->len = b->current_length;
510 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
512 id->flags = VRING_DESC_F_NEXT;
516 b = vlib_get_buffer (vm, b->next_buffer);
517 id->addr = vlib_buffer_get_current_pa (vm, b);
518 id->len = b->current_length;
519 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
521 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
522 vlib_error_count (vm, node->node_index,
523 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
528 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
530 d->addr = pointer_to_uword (id);
531 /* first buffer in chain */
532 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
533 id->len = b->current_length + hdr_sz;
535 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
537 id->flags = VRING_DESC_F_NEXT;
541 b = vlib_get_buffer (vm, b->next_buffer);
542 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
543 id->len = b->current_length;
544 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
546 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
547 vlib_error_count (vm, node->node_index,
548 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
555 d->len = count * sizeof (vnet_virtio_vring_desc_t);
556 d->flags = VRING_DESC_F_INDIRECT;
561 vlib_buffer_t *b_temp = b;
562 u16 n_buffers_in_chain = 1;
565 * Check the length of the chain for the required number of
566 * descriptors. Return from here, retry to get more descriptors,
567 * if chain length is greater than available descriptors.
569 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
571 n_buffers_in_chain++;
572 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
575 if (n_buffers_in_chain > free_desc_count)
576 return n_buffers_in_chain;
578 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
579 d->len = b->current_length + hdr_sz;
581 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
583 d->flags = VRING_DESC_F_NEXT;
584 vring->buffers[count] = bi;
586 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
590 count = (count + 1) & mask;
592 d = &vring->desc[count];
593 b = vlib_get_buffer (vm, bi);
594 d->addr = vlib_buffer_get_current_pa (vm, b);
595 d->len = b->current_length;
598 vring->buffers[count] = bi;
599 vring->avail->ring[avail & mask] = next;
607 vring->buffers[next] = bi;
608 vring->avail->ring[avail & mask] = next;
612 if (drop_inline != ~0)
613 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
620 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
621 virtio_if_t *vif, vnet_virtio_vring_t *vring,
622 u32 bi, u16 next, int hdr_sz, int do_gso,
623 int csum_offload, int is_pci, int is_tun,
624 int is_indirect, int is_any_layout)
626 u16 n_added = 0, flags = 0;
628 vnet_virtio_vring_packed_desc_t *d = &vring->packed_desc[next];
629 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
630 vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
631 u32 drop_inline = ~0;
633 clib_memset (hdr, 0, hdr_sz);
635 vring->total_packets++;
637 if (b->flags & VNET_BUFFER_F_GSO)
640 set_gso_offsets (b, hdr, is_l2);
643 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
647 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
650 set_checksum_offsets (b, hdr, is_l2);
653 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
657 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
659 virtio_tx_trace (vm, node, b, bi, is_tun);
662 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
665 ((is_pci) ? vlib_buffer_get_current_pa (vm,
667 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
668 d->len = b->current_length + hdr_sz;
670 else if (is_indirect)
673 * We are using single vlib_buffer_t for indirect descriptor(s)
674 * chain. Single descriptor is 16 bytes and vlib_buffer_t
675 * has 2048 bytes space. So maximum long chain can have 128
676 * (=2048/16) indirect descriptors.
677 * It can easily support 65535 bytes of Jumbo frames with
678 * each data buffer size of 512 bytes minimum.
680 u32 indirect_buffer = 0;
681 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
683 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
687 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
688 indirect_desc->current_data = 0;
689 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
690 indirect_desc->next_buffer = bi;
691 bi = indirect_buffer;
693 vnet_virtio_vring_packed_desc_t *id =
694 (vnet_virtio_vring_packed_desc_t *) vlib_buffer_get_current (
699 d->addr = vlib_physmem_get_pa (vm, id);
700 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
703 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
704 * should be presented in separate descriptor and data will start
705 * from next descriptor.
708 id->len = b->current_length + hdr_sz;
716 id->addr = vlib_buffer_get_current_pa (vm, b);
717 id->len = b->current_length;
719 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
725 b = vlib_get_buffer (vm, b->next_buffer);
726 id->addr = vlib_buffer_get_current_pa (vm, b);
727 id->len = b->current_length;
728 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
730 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
731 vlib_error_count (vm, node->node_index,
732 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
739 d->len = count * sizeof (vnet_virtio_vring_packed_desc_t);
740 flags = VRING_DESC_F_INDIRECT;
746 if (vring->avail_wrap_counter)
748 flags |= VRING_DESC_F_AVAIL;
749 flags &= ~VRING_DESC_F_USED;
753 flags &= ~VRING_DESC_F_AVAIL;
754 flags |= VRING_DESC_F_USED;
759 vring->buffers[next] = bi;
763 if (drop_inline != ~0)
764 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
771 virtio_interface_tx_packed_gso_inline (
772 vlib_main_t *vm, vlib_node_runtime_t *node, virtio_if_t *vif,
773 virtio_if_type_t type, vnet_virtio_vring_t *vring, u32 *buffers, u16 n_left,
774 const int do_gso, const int csum_offload)
776 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
777 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
779 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
781 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
782 const int hdr_sz = vif->virtio_net_hdr_sz;
783 u16 sz = vring->queue_size;
784 u16 used, next, n_buffers = 0, n_buffers_left = 0;
785 u16 n_vectors = n_left;
788 used = vring->desc_in_use;
789 next = vring->desc_next;
791 if (vif->packet_buffering)
793 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
795 while (n_buffers_left && used < sz)
799 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
802 n_added = add_buffer_to_slot_packed (
803 vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
804 is_pci, is_tun, is_indirect, is_any_layout);
806 if (PREDICT_FALSE (n_added == 0))
814 vring->avail_wrap_counter ^= 1;
817 virtio_txq_clear_scheduled (vring);
820 while (n_left && used < sz)
824 n_added = add_buffer_to_slot_packed (
825 vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
826 is_pci, is_tun, is_indirect, is_any_layout);
829 if (PREDICT_FALSE (n_added == 0))
837 vring->avail_wrap_counter ^= 1;
841 if (n_left != n_vectors || n_buffers != n_buffers_left)
843 CLIB_MEMORY_STORE_BARRIER ();
844 vring->desc_next = next;
845 vring->desc_in_use = used;
846 CLIB_MEMORY_BARRIER ();
847 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
848 virtio_kick (vm, vring, vif);
855 virtio_find_free_desc (vnet_virtio_vring_t *vring, u16 size, u16 mask, u16 req,
856 u16 next, u32 *first_free_desc_index,
857 u16 *free_desc_count)
860 /* next is used as hint: from where to start looking */
861 for (u16 i = 0; i < size; i++, next++)
863 if (vring->buffers[next & mask] == ~0)
865 if (*first_free_desc_index == ~0)
867 *first_free_desc_index = (next & mask);
869 (*free_desc_count)++;
876 if (start + *free_desc_count == i)
878 (*free_desc_count)++;
891 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
892 vlib_node_runtime_t *node,
893 virtio_if_t *vif, virtio_if_type_t type,
894 vnet_virtio_vring_t *vring, u32 *buffers,
895 u16 n_left, int do_gso, int csum_offload)
897 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
898 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
899 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
901 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
903 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
904 u16 sz = vring->queue_size;
905 int hdr_sz = vif->virtio_net_hdr_sz;
907 u16 n_vectors = n_left;
909 used = vring->desc_in_use;
910 next = vring->desc_next;
911 avail = vring->avail->idx;
913 u16 free_desc_count = 0;
915 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
917 u32 first_free_desc_index = ~0;
919 virtio_find_free_desc (vring, sz, mask, n_left, next,
920 &first_free_desc_index, &free_desc_count);
923 next = first_free_desc_index;
926 free_desc_count = sz - used;
928 if (vif->packet_buffering)
930 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
932 while (n_buffers_left && free_desc_count)
936 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
940 n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
941 free_desc_count, avail, next, mask,
942 hdr_sz, do_gso, csum_offload, is_pci,
943 is_tun, is_indirect, is_any_layout);
944 if (PREDICT_FALSE (n_added == 0))
949 else if (PREDICT_FALSE (n_added > free_desc_count))
953 next = (next + n_added) & mask;
956 free_desc_count -= n_added;
958 virtio_txq_clear_scheduled (vring);
961 while (n_left && free_desc_count)
966 add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
967 avail, next, mask, hdr_sz, do_gso, csum_offload,
968 is_pci, is_tun, is_indirect, is_any_layout);
970 if (PREDICT_FALSE (n_added == 0))
976 else if (PREDICT_FALSE (n_added > free_desc_count))
980 next = (next + n_added) & mask;
984 free_desc_count -= n_added;
987 if (n_left != n_vectors || n_buffers != n_buffers_left)
989 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
990 vring->desc_next = next;
991 vring->desc_in_use = used;
992 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
993 VRING_USED_F_NO_NOTIFY) == 0)
994 virtio_kick (vm, vring, vif);
1001 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1002 virtio_if_t *vif, virtio_if_type_t type,
1003 vnet_virtio_vring_t *vring, u32 *buffers,
1004 u16 n_left, int packed, int do_gso,
1008 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
1010 do_gso, csum_offload);
1012 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
1014 do_gso, csum_offload);
1018 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1019 virtio_if_t *vif, vnet_virtio_vring_t *vring,
1020 virtio_if_type_t type, u32 *buffers, u16 n_left,
1023 vnet_main_t *vnm = vnet_get_main ();
1024 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
1026 if (hw->caps & VNET_HW_IF_CAP_TCP_GSO)
1027 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1028 buffers, n_left, packed,
1030 1 /* checksum offload */ );
1031 else if (hw->caps & VNET_HW_IF_CAP_L4_TX_CKSUM)
1032 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1033 buffers, n_left, packed,
1035 1 /* checksum offload */ );
1037 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1038 buffers, n_left, packed,
1040 0 /* no checksum offload */ );
1043 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1044 vlib_node_runtime_t * node,
1045 vlib_frame_t * frame)
1047 virtio_main_t *nm = &virtio_main;
1048 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1049 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1050 vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
1051 u16 qid = tf->queue_id;
1052 vnet_virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1053 u16 n_left = frame->n_vectors;
1054 u32 *buffers = vlib_frame_vector_args (frame);
1055 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1056 int packed = vif->is_packed;
1057 u16 n_vectors = frame->n_vectors;
1059 if (tf->shared_queue)
1060 clib_spinlock_lock (&vring->lockp);
1062 if (vif->packet_coalesce)
1064 n_vectors = n_left =
1065 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1067 virtio_txq_clear_scheduled (vring);
1070 u16 retry_count = 2;
1073 /* free consumed buffers */
1074 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1076 if (vif->type == VIRTIO_IF_TYPE_TAP)
1077 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1079 &buffers[n_vectors - n_left],
1081 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1082 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1084 &buffers[n_vectors - n_left],
1086 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1087 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1089 &buffers[n_vectors - n_left],
1094 if (n_left && retry_count--)
1097 if (vif->packet_buffering && n_left)
1099 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1104 n_left -= n_buffered;
1107 virtio_interface_drop_inline (vm, vif, node->node_index,
1108 &buffers[n_vectors - n_left], n_left,
1109 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1111 if (tf->shared_queue)
1112 clib_spinlock_unlock (&vring->lockp);
1114 return frame->n_vectors - n_left;
1118 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1121 virtio_main_t *apm = &virtio_main;
1122 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1123 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1125 /* Shut off redirection */
1126 if (node_index == ~0)
1128 vif->per_interface_next_index = node_index;
1132 vif->per_interface_next_index =
1133 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1138 virtio_clear_hw_interface_counters (u32 instance)
1140 /* Nothing for now */
1144 virtio_set_rx_interrupt (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1147 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1149 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1153 virtio_set_rx_polling (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1156 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1158 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1161 static clib_error_t *
1162 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1163 vnet_hw_if_rx_mode mode)
1165 virtio_main_t *mm = &virtio_main;
1166 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1167 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1168 vnet_virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1170 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1172 virtio_set_rx_polling (vif, rx_vring);
1173 return clib_error_return (0, "interrupt mode is not supported");
1176 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1177 virtio_set_rx_polling (vif, rx_vring);
1179 virtio_set_rx_interrupt (vif, rx_vring);
1181 rx_vring->mode = mode;
1186 static clib_error_t *
1187 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1189 virtio_main_t *mm = &virtio_main;
1190 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1191 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1193 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1195 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1196 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1197 VNET_HW_INTERFACE_FLAG_LINK_UP);
1201 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1202 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1207 static clib_error_t *
1208 virtio_subif_add_del_function (vnet_main_t * vnm,
1210 struct vnet_sw_interface_t *st, int is_add)
1212 /* Nothing for now */
1217 VNET_DEVICE_CLASS (virtio_device_class) = {
1219 .format_device_name = format_virtio_device_name,
1220 .format_device = format_virtio_device,
1221 .format_tx_trace = format_virtio_tx_trace,
1222 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1223 .tx_function_error_strings = virtio_tx_func_error_strings,
1224 .rx_redirect_to_node = virtio_set_interface_next_node,
1225 .clear_counters = virtio_clear_hw_interface_counters,
1226 .admin_up_down_function = virtio_interface_admin_up_down,
1227 .subif_add_del_function = virtio_subif_add_del_function,
1228 .rx_mode_change_function = virtio_interface_rx_mode_change,
1234 * fd.io coding-style-patch-verification: ON
1237 * eval: (c-set-style "gnu")