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/tcp/tcp_packet.h>
31 #include <vnet/udp/udp_packet.h>
32 #include <vnet/devices/virtio/virtio.h>
34 #define foreach_virtio_tx_func_error \
35 _(NO_FREE_SLOTS, "no free tx slots") \
36 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
37 _(PENDING_MSGS, "pending msgs in tx ring") \
38 _(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \
39 _(OUT_OF_ORDER, "out-of-order buffers in used ring") \
40 _(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \
41 _(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop")
45 #define _(f,s) VIRTIO_TX_ERROR_##f,
46 foreach_virtio_tx_func_error
49 } virtio_tx_func_error_t;
51 static char *virtio_tx_func_error_strings[] = {
53 foreach_virtio_tx_func_error
58 format_virtio_device (u8 * s, va_list * args)
60 u32 dev_instance = va_arg (*args, u32);
61 int verbose = va_arg (*args, int);
62 u32 indent = format_get_indent (s);
64 s = format (s, "VIRTIO interface");
67 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
77 generic_header_offset_t gho;
82 format_virtio_tx_trace (u8 * s, va_list * va)
84 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
85 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
86 virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
87 u32 indent = format_get_indent (s);
89 s = format (s, "%Ubuffer 0x%x: %U\n",
90 format_white_space, indent,
91 t->buffer_index, format_vnet_buffer, &t->buffer);
93 format (s, "%U%U\n", format_white_space, indent,
94 format_generic_header_offset, &t->gho);
96 format (s, "%U%U", format_white_space, indent,
97 format_ethernet_header_with_length, t->buffer.pre_data,
98 sizeof (t->buffer.pre_data));
103 virtio_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b0,
106 virtio_tx_trace_t *t;
107 t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
108 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
109 t->buffer_index = bi;
112 int is_ip4 = 0, is_ip6 = 0;
114 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
125 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
128 vnet_generic_header_offset_parser (b0, &t->gho, 1,
130 VNET_BUFFER_F_IS_IP4,
131 b0->flags & VNET_BUFFER_F_IS_IP6);
133 clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
134 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
135 sizeof (t->buffer.pre_data));
139 virtio_interface_drop_inline (vlib_main_t *vm, uword node_index, u32 *buffers,
140 u16 n, virtio_tx_func_error_t error)
142 vlib_error_count (vm, node_index, error, n);
143 vlib_buffer_free (vm, buffers, n);
147 virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
149 ASSERT (n_buffers <= ring_size);
151 if (PREDICT_TRUE (start + n_buffers <= ring_size))
153 clib_memset_u32 (ring + start, ~0, n_buffers);
157 clib_memset_u32 (ring + start, ~0, ring_size - start);
158 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
163 virtio_free_used_device_desc_split (vlib_main_t *vm, virtio_vring_t *vring,
166 u16 used = vring->desc_in_use;
167 u16 sz = vring->size;
169 u16 last = vring->last_used_idx;
170 u16 n_left = vring->used->idx - last;
171 u16 out_of_order_count = 0;
178 vring_used_elem_t *e = &vring->used->ring[last & mask];
180 slot = n_buffers = e->id;
182 while (e->id == (n_buffers & mask))
187 vring_desc_t *d = &vring->desc[e->id];
189 while (d->flags & VRING_DESC_F_NEXT)
193 d = &vring->desc[next];
197 e = &vring->used->ring[last & mask];
199 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
200 sz, (n_buffers - slot));
201 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
202 used -= (n_buffers - slot);
206 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
207 vring->buffers[e->id] = ~0;
211 out_of_order_count++;
212 vring->flags |= VRING_TX_OUT_OF_ORDER;
217 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
218 * It impacts the overall virtio-performance.
220 if (out_of_order_count)
221 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
224 vring->desc_in_use = used;
225 vring->last_used_idx = last;
229 virtio_free_used_device_desc_packed (vlib_main_t *vm, virtio_vring_t *vring,
232 vring_packed_desc_t *d;
233 u16 sz = vring->size;
234 u16 last = vring->last_used_idx;
235 u16 n_buffers = 0, start;
238 if (vring->desc_in_use == 0)
241 d = &vring->packed_desc[last];
245 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
246 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
254 vring->used_wrap_counter ^= 1;
256 d = &vring->packed_desc[last];
262 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
263 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
264 vring->desc_in_use -= n_buffers;
265 vring->last_used_idx = last;
270 virtio_free_used_device_desc (vlib_main_t *vm, virtio_vring_t *vring,
271 uword node_index, int packed)
274 virtio_free_used_device_desc_packed (vm, vring, node_index);
276 virtio_free_used_device_desc_split (vm, vring, node_index);
281 set_checksum_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr,
284 u32 oflags = vnet_buffer2 (b)->oflags;
286 if (b->flags & VNET_BUFFER_F_IS_IP4)
289 generic_header_offset_t gho = { 0 };
290 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
292 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
293 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
294 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
296 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
298 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
300 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
304 * virtio devices do not support IP4 checksum offload. So driver takes care
305 * of it while doing tx.
308 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
309 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
310 ip4->checksum = ip4_header_checksum (ip4);
312 else if (b->flags & VNET_BUFFER_F_IS_IP6)
314 generic_header_offset_t gho = { 0 };
315 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
317 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
318 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
319 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
321 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
323 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
325 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
331 set_gso_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr, const int is_l2)
333 u32 oflags = vnet_buffer2 (b)->oflags;
335 if (b->flags & VNET_BUFFER_F_IS_IP4)
338 generic_header_offset_t gho = { 0 };
339 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
341 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
342 hdr->gso_size = vnet_buffer2 (b)->gso_size;
343 hdr->hdr_len = gho.hdr_sz;
344 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
345 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
346 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
348 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
350 * virtio devices do not support IP4 checksum offload. So driver takes care
351 * of it while doing tx.
353 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
354 ip4->checksum = ip4_header_checksum (ip4);
356 else if (b->flags & VNET_BUFFER_F_IS_IP6)
358 generic_header_offset_t gho = { 0 };
359 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
361 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
362 hdr->gso_size = vnet_buffer2 (b)->gso_size;
363 hdr->hdr_len = gho.hdr_sz;
364 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
365 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
366 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
371 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
372 virtio_vring_t *vring, u32 bi, u16 free_desc_count,
373 u16 avail, u16 next, u16 mask, int hdr_sz, int do_gso,
374 int csum_offload, int is_pci, int is_tun, int is_indirect,
380 d = &vring->desc[next];
381 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
382 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
383 u32 drop_inline = ~0;
385 clib_memset_u8 (hdr, 0, hdr_sz);
387 if (b->flags & VNET_BUFFER_F_GSO)
390 set_gso_offsets (b, hdr, is_l2);
393 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
397 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
400 set_checksum_offsets (b, hdr, is_l2);
403 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
408 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
410 virtio_tx_trace (vm, node, b, bi, is_tun);
413 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
415 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
416 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
417 d->len = b->current_length + hdr_sz;
420 else if (is_indirect)
423 * We are using single vlib_buffer_t for indirect descriptor(s)
424 * chain. Single descriptor is 16 bytes and vlib_buffer_t
425 * has 2048 bytes space. So maximum long chain can have 128
426 * (=2048/16) indirect descriptors.
427 * It can easily support 65535 bytes of Jumbo frames with
428 * each data buffer size of 512 bytes minimum.
430 u32 indirect_buffer = 0;
431 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
433 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
437 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
438 indirect_desc->current_data = 0;
439 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
440 indirect_desc->next_buffer = bi;
441 bi = indirect_buffer;
444 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
448 d->addr = vlib_physmem_get_pa (vm, id);
449 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
452 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
453 * should be presented in separate descriptor and data will start
454 * from next descriptor.
457 id->len = b->current_length + hdr_sz;
461 id->flags = VRING_DESC_F_NEXT;
465 id->addr = vlib_buffer_get_current_pa (vm, b);
466 id->len = b->current_length;
468 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
470 id->flags = VRING_DESC_F_NEXT;
474 b = vlib_get_buffer (vm, b->next_buffer);
475 id->addr = vlib_buffer_get_current_pa (vm, b);
476 id->len = b->current_length;
479 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
481 d->addr = pointer_to_uword (id);
482 /* first buffer in chain */
483 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
484 id->len = b->current_length + hdr_sz;
486 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
488 id->flags = VRING_DESC_F_NEXT;
492 b = vlib_get_buffer (vm, b->next_buffer);
493 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
494 id->len = b->current_length;
499 d->len = count * sizeof (vring_desc_t);
500 d->flags = VRING_DESC_F_INDIRECT;
505 vlib_buffer_t *b_temp = b;
506 u16 n_buffers_in_chain = 1;
509 * Check the length of the chain for the required number of
510 * descriptors. Return from here, retry to get more descriptors,
511 * if chain length is greater than available descriptors.
513 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
515 n_buffers_in_chain++;
516 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
519 if (n_buffers_in_chain > free_desc_count)
520 return n_buffers_in_chain;
522 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
523 d->len = b->current_length + hdr_sz;
525 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
527 d->flags = VRING_DESC_F_NEXT;
528 vring->buffers[count] = bi;
530 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
534 count = (count + 1) & mask;
536 d = &vring->desc[count];
537 b = vlib_get_buffer (vm, bi);
538 d->addr = vlib_buffer_get_current_pa (vm, b);
539 d->len = b->current_length;
542 vring->buffers[count] = bi;
543 vring->avail->ring[avail & mask] = next;
551 vring->buffers[next] = bi;
552 vring->avail->ring[avail & mask] = next;
556 if (drop_inline != ~0)
557 virtio_interface_drop_inline (vm, node->node_index, &bi, 1, drop_inline);
563 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
564 virtio_vring_t *vring, u32 bi, u16 next, int hdr_sz,
565 int do_gso, int csum_offload, int is_pci,
566 int is_tun, int is_indirect, int is_any_layout)
568 u16 n_added = 0, flags = 0;
570 vring_packed_desc_t *d = &vring->packed_desc[next];
571 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
572 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
573 u32 drop_inline = ~0;
575 clib_memset (hdr, 0, hdr_sz);
577 if (b->flags & VNET_BUFFER_F_GSO)
580 set_gso_offsets (b, hdr, is_l2);
583 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
587 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
590 set_checksum_offsets (b, hdr, is_l2);
593 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
597 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
599 virtio_tx_trace (vm, node, b, bi, is_tun);
602 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
605 ((is_pci) ? vlib_buffer_get_current_pa (vm,
607 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
608 d->len = b->current_length + hdr_sz;
610 else if (is_indirect)
613 * We are using single vlib_buffer_t for indirect descriptor(s)
614 * chain. Single descriptor is 16 bytes and vlib_buffer_t
615 * has 2048 bytes space. So maximum long chain can have 128
616 * (=2048/16) indirect descriptors.
617 * It can easily support 65535 bytes of Jumbo frames with
618 * each data buffer size of 512 bytes minimum.
620 u32 indirect_buffer = 0;
621 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
623 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
627 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
628 indirect_desc->current_data = 0;
629 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
630 indirect_desc->next_buffer = bi;
631 bi = indirect_buffer;
633 vring_packed_desc_t *id =
634 (vring_packed_desc_t *) vlib_buffer_get_current (indirect_desc);
638 d->addr = vlib_physmem_get_pa (vm, id);
639 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
642 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
643 * should be presented in separate descriptor and data will start
644 * from next descriptor.
647 id->len = b->current_length + hdr_sz;
655 id->addr = vlib_buffer_get_current_pa (vm, b);
656 id->len = b->current_length;
658 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
664 b = vlib_get_buffer (vm, b->next_buffer);
665 id->addr = vlib_buffer_get_current_pa (vm, b);
666 id->len = b->current_length;
671 d->len = count * sizeof (vring_packed_desc_t);
672 flags = VRING_DESC_F_INDIRECT;
678 if (vring->avail_wrap_counter)
680 flags |= VRING_DESC_F_AVAIL;
681 flags &= ~VRING_DESC_F_USED;
685 flags &= ~VRING_DESC_F_AVAIL;
686 flags |= VRING_DESC_F_USED;
691 vring->buffers[next] = bi;
695 if (drop_inline != ~0)
696 virtio_interface_drop_inline (vm, node->node_index, &bi, 1, drop_inline);
702 virtio_interface_tx_packed_gso_inline (vlib_main_t *vm,
703 vlib_node_runtime_t *node,
704 virtio_if_t *vif, virtio_if_type_t type,
705 virtio_vring_t *vring, u32 *buffers,
706 u16 n_left, const int do_gso,
707 const int csum_offload)
709 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
710 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
712 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
714 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
715 const int hdr_sz = vif->virtio_net_hdr_sz;
716 u16 sz = vring->size;
717 u16 used, next, n_buffers = 0, n_buffers_left = 0;
718 u16 n_vectors = n_left;
721 used = vring->desc_in_use;
722 next = vring->desc_next;
724 if (vif->packet_buffering)
726 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
728 while (n_buffers_left && used < sz)
732 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
735 n_added = add_buffer_to_slot_packed (vm, node,
737 hdr_sz, do_gso, csum_offload,
738 is_pci, is_tun, is_indirect,
741 if (PREDICT_FALSE (n_added == 0))
749 vring->avail_wrap_counter ^= 1;
754 while (n_left && used < sz)
758 n_added = add_buffer_to_slot_packed (vm, node,
759 vring, buffers[0], next,
760 hdr_sz, do_gso, csum_offload,
761 is_pci, is_tun, is_indirect,
765 if (PREDICT_FALSE (n_added == 0))
773 vring->avail_wrap_counter ^= 1;
777 if (n_left != n_vectors || n_buffers != n_buffers_left)
779 CLIB_MEMORY_STORE_BARRIER ();
780 vring->desc_next = next;
781 vring->desc_in_use = used;
782 CLIB_MEMORY_BARRIER ();
783 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
784 virtio_kick (vm, vring, vif);
791 virtio_find_free_desc (virtio_vring_t *vring, u16 size, u16 mask, u16 req,
792 u16 next, u32 *first_free_desc_index,
793 u16 *free_desc_count)
796 /* next is used as hint: from where to start looking */
797 for (u16 i = 0; i < size; i++, next++)
799 if (vring->buffers[next & mask] == ~0)
801 if (*first_free_desc_index == ~0)
803 *first_free_desc_index = (next & mask);
805 (*free_desc_count)++;
812 if (start + *free_desc_count == i)
814 (*free_desc_count)++;
827 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
828 vlib_node_runtime_t *node,
829 virtio_if_t *vif, virtio_if_type_t type,
830 virtio_vring_t *vring, u32 *buffers,
831 u16 n_left, int do_gso, int csum_offload)
833 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
834 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
835 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
837 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
839 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
840 u16 sz = vring->size;
841 int hdr_sz = vif->virtio_net_hdr_sz;
843 u16 n_vectors = n_left;
845 used = vring->desc_in_use;
846 next = vring->desc_next;
847 avail = vring->avail->idx;
849 u16 free_desc_count = 0;
851 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
853 u32 first_free_desc_index = ~0;
855 virtio_find_free_desc (vring, sz, mask, n_left, next,
856 &first_free_desc_index, &free_desc_count);
859 next = first_free_desc_index;
862 free_desc_count = sz - used;
864 if (vif->packet_buffering)
866 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
868 while (n_buffers_left && free_desc_count)
872 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
876 n_added = add_buffer_to_slot (vm, node, vring, bi, free_desc_count,
877 avail, next, mask, hdr_sz, do_gso,
878 csum_offload, is_pci, is_tun,
879 is_indirect, is_any_layout);
880 if (PREDICT_FALSE (n_added == 0))
885 else if (PREDICT_FALSE (n_added > free_desc_count))
889 next = (next + n_added) & mask;
892 free_desc_count -= n_added;
896 while (n_left && free_desc_count)
900 n_added = add_buffer_to_slot (vm, node, vring, buffers[0],
901 free_desc_count, avail, next, mask,
902 hdr_sz, do_gso, csum_offload, is_pci,
903 is_tun, is_indirect, is_any_layout);
905 if (PREDICT_FALSE (n_added == 0))
911 else if (PREDICT_FALSE (n_added > free_desc_count))
915 next = (next + n_added) & mask;
919 free_desc_count -= n_added;
922 if (n_left != n_vectors || n_buffers != n_buffers_left)
924 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
925 vring->desc_next = next;
926 vring->desc_in_use = used;
927 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
928 VRING_USED_F_NO_NOTIFY) == 0)
929 virtio_kick (vm, vring, vif);
936 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
937 virtio_if_t *vif, virtio_if_type_t type,
938 virtio_vring_t *vring, u32 *buffers,
939 u16 n_left, int packed, int do_gso,
943 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
945 do_gso, csum_offload);
947 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
949 do_gso, csum_offload);
953 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
954 virtio_if_t *vif, virtio_vring_t *vring,
955 virtio_if_type_t type, u32 *buffers, u16 n_left,
958 vnet_main_t *vnm = vnet_get_main ();
959 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
961 if (hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO)
962 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
963 buffers, n_left, packed,
965 1 /* checksum offload */ );
966 else if (hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM)
967 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
968 buffers, n_left, packed,
970 1 /* checksum offload */ );
972 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
973 buffers, n_left, packed,
975 0 /* no checksum offload */ );
978 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
979 vlib_node_runtime_t * node,
980 vlib_frame_t * frame)
982 virtio_main_t *nm = &virtio_main;
983 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
984 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
985 u16 qid = vm->thread_index % vif->num_txqs;
986 virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
987 u16 n_left = frame->n_vectors;
988 u32 *buffers = vlib_frame_vector_args (frame);
989 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
990 int packed = vif->is_packed;
991 u16 n_vectors = frame->n_vectors;
993 clib_spinlock_lock_if_init (&vring->lockp);
995 if (vif->packet_coalesce)
998 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1002 u16 retry_count = 2;
1005 /* free consumed buffers */
1006 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1008 if (vif->type == VIRTIO_IF_TYPE_TAP)
1009 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1011 &buffers[n_vectors - n_left],
1013 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1014 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1016 &buffers[n_vectors - n_left],
1018 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1019 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1021 &buffers[n_vectors - n_left],
1026 if (n_left && retry_count--)
1029 if (vif->packet_buffering && n_left)
1031 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1036 n_left -= n_buffered;
1039 virtio_interface_drop_inline (vm, node->node_index,
1040 &buffers[n_vectors - n_left], n_left,
1041 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1043 clib_spinlock_unlock_if_init (&vring->lockp);
1045 return frame->n_vectors - n_left;
1049 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1052 virtio_main_t *apm = &virtio_main;
1053 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1054 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1056 /* Shut off redirection */
1057 if (node_index == ~0)
1059 vif->per_interface_next_index = node_index;
1063 vif->per_interface_next_index =
1064 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1069 virtio_clear_hw_interface_counters (u32 instance)
1071 /* Nothing for now */
1075 virtio_set_rx_interrupt (virtio_if_t *vif, virtio_vring_t *vring)
1078 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1080 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1084 virtio_set_rx_polling (virtio_if_t *vif, virtio_vring_t *vring)
1087 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1089 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1092 static clib_error_t *
1093 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1094 vnet_hw_if_rx_mode mode)
1096 vlib_main_t *vm = vnm->vlib_main;
1097 virtio_main_t *mm = &virtio_main;
1098 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1099 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1100 virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1102 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1104 virtio_set_rx_polling (vif, rx_vring);
1105 return clib_error_return (0, "interrupt mode is not supported");
1108 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1110 if (vif->packet_coalesce || vif->packet_buffering)
1112 if (mm->interrupt_queues_count > 0)
1113 mm->interrupt_queues_count--;
1114 if (mm->interrupt_queues_count == 0)
1115 vlib_process_signal_event (vm,
1116 virtio_send_interrupt_node.index,
1117 VIRTIO_EVENT_STOP_TIMER, 0);
1119 virtio_set_rx_polling (vif, rx_vring);
1123 if (vif->packet_coalesce || vif->packet_buffering)
1125 mm->interrupt_queues_count++;
1126 if (mm->interrupt_queues_count == 1)
1127 vlib_process_signal_event (vm,
1128 virtio_send_interrupt_node.index,
1129 VIRTIO_EVENT_START_TIMER, 0);
1131 virtio_set_rx_interrupt (vif, rx_vring);
1134 rx_vring->mode = mode;
1139 static clib_error_t *
1140 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1142 virtio_main_t *mm = &virtio_main;
1143 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1144 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1146 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1148 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1149 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1150 VNET_HW_INTERFACE_FLAG_LINK_UP);
1154 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1155 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1160 static clib_error_t *
1161 virtio_subif_add_del_function (vnet_main_t * vnm,
1163 struct vnet_sw_interface_t *st, int is_add)
1165 /* Nothing for now */
1170 VNET_DEVICE_CLASS (virtio_device_class) = {
1172 .format_device_name = format_virtio_device_name,
1173 .format_device = format_virtio_device,
1174 .format_tx_trace = format_virtio_tx_trace,
1175 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1176 .tx_function_error_strings = virtio_tx_func_error_strings,
1177 .rx_redirect_to_node = virtio_set_interface_next_node,
1178 .clear_counters = virtio_clear_hw_interface_counters,
1179 .admin_up_down_function = virtio_interface_admin_up_down,
1180 .subif_add_del_function = virtio_subif_add_del_function,
1181 .rx_mode_change_function = virtio_interface_rx_mode_change,
1187 * fd.io coding-style-patch-verification: ON
1190 * eval: (c-set-style "gnu")