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, virtio_vring_t *vring,
172 u16 used = vring->desc_in_use;
173 u16 sz = vring->size;
175 u16 last = vring->last_used_idx;
176 u16 n_left = vring->used->idx - last;
177 u16 out_of_order_count = 0;
184 vring_used_elem_t *e = &vring->used->ring[last & mask];
186 slot = n_buffers = e->id;
188 while (e->id == (n_buffers & mask))
193 vring_desc_t *d = &vring->desc[e->id];
195 while (d->flags & VRING_DESC_F_NEXT)
199 d = &vring->desc[next];
203 e = &vring->used->ring[last & mask];
205 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
206 sz, (n_buffers - slot));
207 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
208 used -= (n_buffers - slot);
212 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
213 vring->buffers[e->id] = ~0;
217 out_of_order_count++;
218 vring->flags |= VRING_TX_OUT_OF_ORDER;
223 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
224 * It impacts the overall virtio-performance.
226 if (out_of_order_count)
227 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
230 vring->desc_in_use = used;
231 vring->last_used_idx = last;
235 virtio_free_used_device_desc_packed (vlib_main_t *vm, virtio_vring_t *vring,
238 vring_packed_desc_t *d;
239 u16 sz = vring->size;
240 u16 last = vring->last_used_idx;
241 u16 n_buffers = 0, start;
244 if (vring->desc_in_use == 0)
247 d = &vring->packed_desc[last];
251 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
252 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
260 vring->used_wrap_counter ^= 1;
262 d = &vring->packed_desc[last];
268 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
269 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
270 vring->desc_in_use -= n_buffers;
271 vring->last_used_idx = last;
276 virtio_free_used_device_desc (vlib_main_t *vm, virtio_vring_t *vring,
277 uword node_index, int packed)
280 virtio_free_used_device_desc_packed (vm, vring, node_index);
282 virtio_free_used_device_desc_split (vm, vring, node_index);
287 set_checksum_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr,
290 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
292 if (b->flags & VNET_BUFFER_F_IS_IP4)
295 generic_header_offset_t gho = { 0 };
296 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
298 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
299 hdr->csum_start = gho.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 *) (vlib_buffer_get_current (b) + gho.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 *) (vlib_buffer_get_current (b) + gho.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 *) (vlib_buffer_get_current (b) + gho.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 generic_header_offset_t gho = { 0 };
332 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
334 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
335 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
336 ip6 = (ip6_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
339 * virtio devices assume the l4 header is set to the checksum of the
340 * l3 pseudo-header, so we compute it before tx-ing
342 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
345 (tcp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
346 tcp->checksum = ip6_pseudo_header_cksum (ip6);
347 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
349 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
352 (udp_header_t *) (vlib_buffer_get_current (b) + gho.l4_hdr_offset);
353 udp->checksum = ip6_pseudo_header_cksum (ip6);
354 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
360 set_gso_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr, const int is_l2)
362 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
364 if (b->flags & VNET_BUFFER_F_IS_IP4)
367 generic_header_offset_t gho = { 0 };
368 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
370 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
371 hdr->gso_size = vnet_buffer2 (b)->gso_size;
372 hdr->hdr_len = gho.hdr_sz;
373 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
374 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
375 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
377 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
379 * virtio devices do not support IP4 checksum offload. So driver takes care
380 * of it while doing tx.
382 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
383 ip4->checksum = ip4_header_checksum (ip4);
385 else if (b->flags & VNET_BUFFER_F_IS_IP6)
387 generic_header_offset_t gho = { 0 };
388 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
390 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
391 hdr->gso_size = vnet_buffer2 (b)->gso_size;
392 hdr->hdr_len = gho.hdr_sz;
393 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
394 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
395 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
400 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
401 virtio_if_t *vif, virtio_vring_t *vring, u32 bi,
402 u16 free_desc_count, u16 avail, u16 next, u16 mask,
403 int hdr_sz, int do_gso, int csum_offload, int is_pci,
404 int is_tun, int is_indirect, int is_any_layout)
409 d = &vring->desc[next];
410 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
411 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
412 u32 drop_inline = ~0;
414 clib_memset_u8 (hdr, 0, hdr_sz);
416 if (b->flags & VNET_BUFFER_F_GSO)
419 set_gso_offsets (b, hdr, is_l2);
422 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
426 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
429 set_checksum_offsets (b, hdr, is_l2);
432 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
437 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
439 virtio_tx_trace (vm, node, b, bi, is_tun);
442 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
444 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
445 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
446 d->len = b->current_length + hdr_sz;
449 else if (is_indirect)
452 * We are using single vlib_buffer_t for indirect descriptor(s)
453 * chain. Single descriptor is 16 bytes and vlib_buffer_t
454 * has 2048 bytes space. So maximum long chain can have 128
455 * (=2048/16) indirect descriptors.
456 * It can easily support 65535 bytes of Jumbo frames with
457 * each data buffer size of 512 bytes minimum.
459 u32 indirect_buffer = 0;
460 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
462 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
466 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
467 indirect_desc->current_data = 0;
468 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
469 indirect_desc->next_buffer = bi;
470 bi = indirect_buffer;
473 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
477 d->addr = vlib_physmem_get_pa (vm, id);
478 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
481 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
482 * should be presented in separate descriptor and data will start
483 * from next descriptor.
486 id->len = b->current_length + hdr_sz;
490 id->flags = VRING_DESC_F_NEXT;
494 id->addr = vlib_buffer_get_current_pa (vm, b);
495 id->len = b->current_length;
497 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
499 id->flags = VRING_DESC_F_NEXT;
503 b = vlib_get_buffer (vm, b->next_buffer);
504 id->addr = vlib_buffer_get_current_pa (vm, b);
505 id->len = b->current_length;
506 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
508 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
509 vlib_error_count (vm, node->node_index,
510 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
515 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
517 d->addr = pointer_to_uword (id);
518 /* first buffer in chain */
519 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
520 id->len = b->current_length + hdr_sz;
522 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
524 id->flags = VRING_DESC_F_NEXT;
528 b = vlib_get_buffer (vm, b->next_buffer);
529 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
530 id->len = b->current_length;
531 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
533 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
534 vlib_error_count (vm, node->node_index,
535 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
542 d->len = count * sizeof (vring_desc_t);
543 d->flags = VRING_DESC_F_INDIRECT;
548 vlib_buffer_t *b_temp = b;
549 u16 n_buffers_in_chain = 1;
552 * Check the length of the chain for the required number of
553 * descriptors. Return from here, retry to get more descriptors,
554 * if chain length is greater than available descriptors.
556 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
558 n_buffers_in_chain++;
559 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
562 if (n_buffers_in_chain > free_desc_count)
563 return n_buffers_in_chain;
565 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
566 d->len = b->current_length + hdr_sz;
568 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
570 d->flags = VRING_DESC_F_NEXT;
571 vring->buffers[count] = bi;
573 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
577 count = (count + 1) & mask;
579 d = &vring->desc[count];
580 b = vlib_get_buffer (vm, bi);
581 d->addr = vlib_buffer_get_current_pa (vm, b);
582 d->len = b->current_length;
585 vring->buffers[count] = bi;
586 vring->avail->ring[avail & mask] = next;
594 vring->buffers[next] = bi;
595 vring->avail->ring[avail & mask] = next;
599 if (drop_inline != ~0)
600 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
607 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
608 virtio_if_t *vif, virtio_vring_t *vring, u32 bi,
609 u16 next, int hdr_sz, int do_gso, int csum_offload,
610 int is_pci, int is_tun, int is_indirect,
613 u16 n_added = 0, flags = 0;
615 vring_packed_desc_t *d = &vring->packed_desc[next];
616 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
617 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
618 u32 drop_inline = ~0;
620 clib_memset (hdr, 0, hdr_sz);
622 if (b->flags & VNET_BUFFER_F_GSO)
625 set_gso_offsets (b, hdr, is_l2);
628 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
632 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
635 set_checksum_offsets (b, hdr, is_l2);
638 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
642 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
644 virtio_tx_trace (vm, node, b, bi, is_tun);
647 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
650 ((is_pci) ? vlib_buffer_get_current_pa (vm,
652 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
653 d->len = b->current_length + hdr_sz;
655 else if (is_indirect)
658 * We are using single vlib_buffer_t for indirect descriptor(s)
659 * chain. Single descriptor is 16 bytes and vlib_buffer_t
660 * has 2048 bytes space. So maximum long chain can have 128
661 * (=2048/16) indirect descriptors.
662 * It can easily support 65535 bytes of Jumbo frames with
663 * each data buffer size of 512 bytes minimum.
665 u32 indirect_buffer = 0;
666 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
668 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
672 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
673 indirect_desc->current_data = 0;
674 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
675 indirect_desc->next_buffer = bi;
676 bi = indirect_buffer;
678 vring_packed_desc_t *id =
679 (vring_packed_desc_t *) vlib_buffer_get_current (indirect_desc);
683 d->addr = vlib_physmem_get_pa (vm, id);
684 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
687 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
688 * should be presented in separate descriptor and data will start
689 * from next descriptor.
692 id->len = b->current_length + hdr_sz;
700 id->addr = vlib_buffer_get_current_pa (vm, b);
701 id->len = b->current_length;
703 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
709 b = vlib_get_buffer (vm, b->next_buffer);
710 id->addr = vlib_buffer_get_current_pa (vm, b);
711 id->len = b->current_length;
712 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
714 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
715 vlib_error_count (vm, node->node_index,
716 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
723 d->len = count * sizeof (vring_packed_desc_t);
724 flags = VRING_DESC_F_INDIRECT;
730 if (vring->avail_wrap_counter)
732 flags |= VRING_DESC_F_AVAIL;
733 flags &= ~VRING_DESC_F_USED;
737 flags &= ~VRING_DESC_F_AVAIL;
738 flags |= VRING_DESC_F_USED;
743 vring->buffers[next] = bi;
747 if (drop_inline != ~0)
748 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
755 virtio_interface_tx_packed_gso_inline (vlib_main_t *vm,
756 vlib_node_runtime_t *node,
757 virtio_if_t *vif, virtio_if_type_t type,
758 virtio_vring_t *vring, u32 *buffers,
759 u16 n_left, const int do_gso,
760 const int csum_offload)
762 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
763 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
765 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
767 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
768 const int hdr_sz = vif->virtio_net_hdr_sz;
769 u16 sz = vring->size;
770 u16 used, next, n_buffers = 0, n_buffers_left = 0;
771 u16 n_vectors = n_left;
774 used = vring->desc_in_use;
775 next = vring->desc_next;
777 if (vif->packet_buffering)
779 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
781 while (n_buffers_left && used < sz)
785 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
788 n_added = add_buffer_to_slot_packed (
789 vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
790 is_pci, is_tun, is_indirect, is_any_layout);
792 if (PREDICT_FALSE (n_added == 0))
800 vring->avail_wrap_counter ^= 1;
803 virtio_txq_clear_scheduled (vring);
806 while (n_left && used < sz)
810 n_added = add_buffer_to_slot_packed (
811 vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
812 is_pci, is_tun, is_indirect, is_any_layout);
815 if (PREDICT_FALSE (n_added == 0))
823 vring->avail_wrap_counter ^= 1;
827 if (n_left != n_vectors || n_buffers != n_buffers_left)
829 CLIB_MEMORY_STORE_BARRIER ();
830 vring->desc_next = next;
831 vring->desc_in_use = used;
832 CLIB_MEMORY_BARRIER ();
833 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
834 virtio_kick (vm, vring, vif);
841 virtio_find_free_desc (virtio_vring_t *vring, u16 size, u16 mask, u16 req,
842 u16 next, u32 *first_free_desc_index,
843 u16 *free_desc_count)
846 /* next is used as hint: from where to start looking */
847 for (u16 i = 0; i < size; i++, next++)
849 if (vring->buffers[next & mask] == ~0)
851 if (*first_free_desc_index == ~0)
853 *first_free_desc_index = (next & mask);
855 (*free_desc_count)++;
862 if (start + *free_desc_count == i)
864 (*free_desc_count)++;
877 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
878 vlib_node_runtime_t *node,
879 virtio_if_t *vif, virtio_if_type_t type,
880 virtio_vring_t *vring, u32 *buffers,
881 u16 n_left, int do_gso, int csum_offload)
883 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
884 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
885 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
887 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
889 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
890 u16 sz = vring->size;
891 int hdr_sz = vif->virtio_net_hdr_sz;
893 u16 n_vectors = n_left;
895 used = vring->desc_in_use;
896 next = vring->desc_next;
897 avail = vring->avail->idx;
899 u16 free_desc_count = 0;
901 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
903 u32 first_free_desc_index = ~0;
905 virtio_find_free_desc (vring, sz, mask, n_left, next,
906 &first_free_desc_index, &free_desc_count);
909 next = first_free_desc_index;
912 free_desc_count = sz - used;
914 if (vif->packet_buffering)
916 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
918 while (n_buffers_left && free_desc_count)
922 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
926 n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
927 free_desc_count, avail, next, mask,
928 hdr_sz, do_gso, csum_offload, is_pci,
929 is_tun, is_indirect, is_any_layout);
930 if (PREDICT_FALSE (n_added == 0))
935 else if (PREDICT_FALSE (n_added > free_desc_count))
939 next = (next + n_added) & mask;
942 free_desc_count -= n_added;
944 virtio_txq_clear_scheduled (vring);
947 while (n_left && free_desc_count)
952 add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
953 avail, next, mask, hdr_sz, do_gso, csum_offload,
954 is_pci, is_tun, is_indirect, is_any_layout);
956 if (PREDICT_FALSE (n_added == 0))
962 else if (PREDICT_FALSE (n_added > free_desc_count))
966 next = (next + n_added) & mask;
970 free_desc_count -= n_added;
973 if (n_left != n_vectors || n_buffers != n_buffers_left)
975 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
976 vring->desc_next = next;
977 vring->desc_in_use = used;
978 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
979 VRING_USED_F_NO_NOTIFY) == 0)
980 virtio_kick (vm, vring, vif);
987 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
988 virtio_if_t *vif, virtio_if_type_t type,
989 virtio_vring_t *vring, u32 *buffers,
990 u16 n_left, int packed, int do_gso,
994 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
996 do_gso, csum_offload);
998 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
1000 do_gso, csum_offload);
1004 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1005 virtio_if_t *vif, virtio_vring_t *vring,
1006 virtio_if_type_t type, u32 *buffers, u16 n_left,
1009 vnet_main_t *vnm = vnet_get_main ();
1010 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
1012 if (hw->caps & VNET_HW_IF_CAP_TCP_GSO)
1013 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1014 buffers, n_left, packed,
1016 1 /* checksum offload */ );
1017 else if (hw->caps & VNET_HW_IF_CAP_L4_TX_CKSUM)
1018 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1019 buffers, n_left, packed,
1021 1 /* checksum offload */ );
1023 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1024 buffers, n_left, packed,
1026 0 /* no checksum offload */ );
1029 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1030 vlib_node_runtime_t * node,
1031 vlib_frame_t * frame)
1033 virtio_main_t *nm = &virtio_main;
1034 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1035 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1036 vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
1037 u16 qid = tf->queue_id;
1038 virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1039 u16 n_left = frame->n_vectors;
1040 u32 *buffers = vlib_frame_vector_args (frame);
1041 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1042 int packed = vif->is_packed;
1043 u16 n_vectors = frame->n_vectors;
1045 if (tf->shared_queue)
1046 clib_spinlock_lock (&vring->lockp);
1048 if (vif->packet_coalesce)
1050 n_vectors = n_left =
1051 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1053 virtio_txq_clear_scheduled (vring);
1056 u16 retry_count = 2;
1059 /* free consumed buffers */
1060 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1062 if (vif->type == VIRTIO_IF_TYPE_TAP)
1063 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1065 &buffers[n_vectors - n_left],
1067 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1068 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1070 &buffers[n_vectors - n_left],
1072 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1073 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1075 &buffers[n_vectors - n_left],
1080 if (n_left && retry_count--)
1083 if (vif->packet_buffering && n_left)
1085 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1090 n_left -= n_buffered;
1093 virtio_interface_drop_inline (vm, vif, node->node_index,
1094 &buffers[n_vectors - n_left], n_left,
1095 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1097 if (tf->shared_queue)
1098 clib_spinlock_unlock (&vring->lockp);
1100 return frame->n_vectors - n_left;
1104 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1107 virtio_main_t *apm = &virtio_main;
1108 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1109 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1111 /* Shut off redirection */
1112 if (node_index == ~0)
1114 vif->per_interface_next_index = node_index;
1118 vif->per_interface_next_index =
1119 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1124 virtio_clear_hw_interface_counters (u32 instance)
1126 /* Nothing for now */
1130 virtio_set_rx_interrupt (virtio_if_t *vif, virtio_vring_t *vring)
1133 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1135 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1139 virtio_set_rx_polling (virtio_if_t *vif, virtio_vring_t *vring)
1142 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1144 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1147 static clib_error_t *
1148 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1149 vnet_hw_if_rx_mode mode)
1151 virtio_main_t *mm = &virtio_main;
1152 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1153 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1154 virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1156 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1158 virtio_set_rx_polling (vif, rx_vring);
1159 return clib_error_return (0, "interrupt mode is not supported");
1162 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1163 virtio_set_rx_polling (vif, rx_vring);
1165 virtio_set_rx_interrupt (vif, rx_vring);
1167 rx_vring->mode = mode;
1172 static clib_error_t *
1173 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1175 virtio_main_t *mm = &virtio_main;
1176 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1177 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1179 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1181 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1182 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1183 VNET_HW_INTERFACE_FLAG_LINK_UP);
1187 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1188 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1193 static clib_error_t *
1194 virtio_subif_add_del_function (vnet_main_t * vnm,
1196 struct vnet_sw_interface_t *st, int is_add)
1198 /* Nothing for now */
1203 VNET_DEVICE_CLASS (virtio_device_class) = {
1205 .format_device_name = format_virtio_device_name,
1206 .format_device = format_virtio_device,
1207 .format_tx_trace = format_virtio_tx_trace,
1208 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1209 .tx_function_error_strings = virtio_tx_func_error_strings,
1210 .rx_redirect_to_node = virtio_set_interface_next_node,
1211 .clear_counters = virtio_clear_hw_interface_counters,
1212 .admin_up_down_function = virtio_interface_admin_up_down,
1213 .subif_add_del_function = virtio_subif_add_del_function,
1214 .rx_mode_change_function = virtio_interface_rx_mode_change,
1220 * fd.io coding-style-patch-verification: ON
1223 * eval: (c-set-style "gnu")