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));
102 static_always_inline void
103 virtio_tx_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
104 virtio_if_type_t type, vlib_buffer_t * b0, u32 bi)
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;
110 if (type == VIRTIO_IF_TYPE_TUN)
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));
138 static_always_inline void
139 virtio_interface_drop_inline (vlib_main_t * vm, uword node_index,
140 u32 * buffers, u16 n,
141 virtio_tx_func_error_t error)
143 vlib_error_count (vm, node_index, error, n);
144 vlib_buffer_free (vm, buffers, n);
147 static_always_inline void
148 virtio_memset_ring_u32 (u32 * ring, u32 start, u32 ring_size, u32 n_buffers)
150 ASSERT (n_buffers <= ring_size);
152 if (PREDICT_TRUE (start + n_buffers <= ring_size))
154 clib_memset_u32 (ring + start, ~0, n_buffers);
158 clib_memset_u32 (ring + start, ~0, ring_size - start);
159 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
163 static_always_inline void
164 virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring,
167 u16 used = vring->desc_in_use;
168 u16 sz = vring->size;
170 u16 last = vring->last_used_idx;
171 u16 n_left = vring->used->idx - last;
172 u16 out_of_order_count = 0;
179 vring_used_elem_t *e = &vring->used->ring[last & mask];
181 slot = n_buffers = e->id;
183 while (e->id == (n_buffers & mask))
188 vring_desc_t *d = &vring->desc[e->id];
190 while (d->flags & VRING_DESC_F_NEXT)
194 d = &vring->desc[next];
198 e = &vring->used->ring[last & mask];
200 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
201 sz, (n_buffers - slot));
202 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
203 used -= (n_buffers - slot);
207 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
208 vring->buffers[e->id] = ~0;
212 out_of_order_count++;
213 vring->flags |= VRING_TX_OUT_OF_ORDER;
218 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
219 * It impacts the overall virtio-performance.
221 if (out_of_order_count)
222 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
225 vring->desc_in_use = used;
226 vring->last_used_idx = last;
229 static_always_inline void
230 set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2)
232 if (b->flags & VNET_BUFFER_F_IS_IP4)
235 generic_header_offset_t gho = { 0 };
236 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
238 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
239 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
240 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
242 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
244 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
246 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
250 * virtio devices do not support IP4 checksum offload. So driver takes care
251 * of it while doing tx.
254 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
255 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
256 ip4->checksum = ip4_header_checksum (ip4);
258 else if (b->flags & VNET_BUFFER_F_IS_IP6)
260 generic_header_offset_t gho = { 0 };
261 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
263 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
264 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
265 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
267 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
269 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
271 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
276 static_always_inline void
277 set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2)
279 if (b->flags & VNET_BUFFER_F_IS_IP4)
282 generic_header_offset_t gho = { 0 };
283 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
285 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
286 hdr->gso_size = vnet_buffer2 (b)->gso_size;
287 hdr->hdr_len = gho.hdr_sz;
288 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
289 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
290 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
292 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
294 * virtio devices do not support IP4 checksum offload. So driver takes care
295 * of it while doing tx.
297 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
298 ip4->checksum = ip4_header_checksum (ip4);
300 else if (b->flags & VNET_BUFFER_F_IS_IP6)
302 generic_header_offset_t gho = { 0 };
303 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
305 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
306 hdr->gso_size = vnet_buffer2 (b)->gso_size;
307 hdr->hdr_len = gho.hdr_sz;
308 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
309 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
310 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
314 static_always_inline u16
315 add_buffer_to_slot (vlib_main_t * vm, vlib_node_runtime_t * node,
316 virtio_if_t * vif, virtio_if_type_t type,
317 virtio_vring_t * vring, u32 bi, u16 free_desc_count,
318 u16 avail, u16 next, u16 mask, int do_gso,
322 int hdr_sz = vif->virtio_net_hdr_sz;
324 d = &vring->desc[next];
325 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
326 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
327 int is_l2 = (type & (VIRTIO_IF_TYPE_TAP | VIRTIO_IF_TYPE_PCI));
329 clib_memset (hdr, 0, hdr_sz);
331 if (b->flags & VNET_BUFFER_F_GSO)
334 set_gso_offsets (b, hdr, is_l2);
337 virtio_interface_drop_inline (vm, node->node_index, &bi, 1,
338 VIRTIO_TX_ERROR_GSO_PACKET_DROP);
342 else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
343 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
346 set_checksum_offsets (b, hdr, is_l2);
349 virtio_interface_drop_inline (vm, node->node_index, &bi, 1,
350 VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP);
355 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
357 virtio_tx_trace (vm, node, type, b, bi);
360 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
363 ((type == VIRTIO_IF_TYPE_PCI) ? vlib_buffer_get_current_pa (vm,
365 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
366 d->len = b->current_length + hdr_sz;
369 else if (vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC))
372 * We are using single vlib_buffer_t for indirect descriptor(s)
373 * chain. Single descriptor is 16 bytes and vlib_buffer_t
374 * has 2048 bytes space. So maximum long chain can have 128
375 * (=2048/16) indirect descriptors.
376 * It can easily support 65535 bytes of Jumbo frames with
377 * each data buffer size of 512 bytes minimum.
379 u32 indirect_buffer = 0;
380 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
382 virtio_interface_drop_inline (vm, node->node_index, &bi, 1,
383 VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED);
387 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
388 indirect_desc->current_data = 0;
389 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
390 indirect_desc->next_buffer = bi;
391 bi = indirect_buffer;
394 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
396 if (type == VIRTIO_IF_TYPE_PCI)
398 d->addr = vlib_physmem_get_pa (vm, id);
399 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
402 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
403 * should be presented in separate descriptor and data will start
404 * from next descriptor.
407 (vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)))
408 id->len = b->current_length + hdr_sz;
412 id->flags = VRING_DESC_F_NEXT;
416 id->addr = vlib_buffer_get_current_pa (vm, b);
417 id->len = b->current_length;
419 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
421 id->flags = VRING_DESC_F_NEXT;
425 b = vlib_get_buffer (vm, b->next_buffer);
426 id->addr = vlib_buffer_get_current_pa (vm, b);
427 id->len = b->current_length;
430 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
432 d->addr = pointer_to_uword (id);
433 /* first buffer in chain */
434 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
435 id->len = b->current_length + hdr_sz;
437 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
439 id->flags = VRING_DESC_F_NEXT;
443 b = vlib_get_buffer (vm, b->next_buffer);
444 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
445 id->len = b->current_length;
450 d->len = count * sizeof (vring_desc_t);
451 d->flags = VRING_DESC_F_INDIRECT;
453 else if (type == VIRTIO_IF_TYPE_PCI)
456 vlib_buffer_t *b_temp = b;
457 u16 n_buffers_in_chain = 1;
460 * Check the length of the chain for the required number of
461 * descriptors. Return from here, retry to get more descriptors,
462 * if chain length is greater than available descriptors.
464 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
466 n_buffers_in_chain++;
467 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
470 if (n_buffers_in_chain > free_desc_count)
471 return n_buffers_in_chain;
473 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
474 d->len = b->current_length + hdr_sz;
476 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
478 d->flags = VRING_DESC_F_NEXT;
479 vring->buffers[count] = bi;
481 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
485 count = (count + 1) & mask;
487 d = &vring->desc[count];
488 b = vlib_get_buffer (vm, bi);
489 d->addr = vlib_buffer_get_current_pa (vm, b);
490 d->len = b->current_length;
493 vring->buffers[count] = bi;
494 vring->avail->ring[avail & mask] = next;
502 vring->buffers[next] = bi;
503 vring->avail->ring[avail & mask] = next;
508 static_always_inline void
509 virtio_find_free_desc (virtio_vring_t * vring, u16 size, u16 mask,
510 u16 req, u16 next, u32 * first_free_desc_index,
511 u16 * free_desc_count)
514 /* next is used as hint: from where to start looking */
515 for (u16 i = 0; i < size; i++, next++)
517 if (vring->buffers[next & mask] == ~0)
519 if (*first_free_desc_index == ~0)
521 *first_free_desc_index = (next & mask);
523 (*free_desc_count)++;
530 if (start + *free_desc_count == i)
532 (*free_desc_count)++;
544 static_always_inline u16
545 virtio_interface_tx_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
547 virtio_if_type_t type, virtio_vring_t * vring,
548 u32 * buffers, u16 n_left, int do_gso,
551 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
552 u16 sz = vring->size;
554 u16 n_vectors = n_left;
558 /* free consumed buffers */
559 virtio_free_used_device_desc (vm, vring, node->node_index);
561 used = vring->desc_in_use;
562 next = vring->desc_next;
563 avail = vring->avail->idx;
565 u16 free_desc_count = 0;
567 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
569 u32 first_free_desc_index = ~0;
571 virtio_find_free_desc (vring, sz, mask, n_left, next,
572 &first_free_desc_index, &free_desc_count);
575 next = first_free_desc_index;
578 free_desc_count = sz - used;
580 if (vif->packet_buffering)
582 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
584 while (n_buffers_left && free_desc_count)
588 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
593 add_buffer_to_slot (vm, node, vif, type, vring, bi,
594 free_desc_count, avail, next, mask, do_gso,
596 if (PREDICT_FALSE (n_added == 0))
601 else if (PREDICT_FALSE (n_added > free_desc_count))
605 next = (next + n_added) & mask;
608 free_desc_count -= n_added;
612 while (n_left && free_desc_count)
617 add_buffer_to_slot (vm, node, vif, type, vring, buffers[0],
618 free_desc_count, avail, next, mask, do_gso,
621 if (PREDICT_FALSE (n_added == 0))
627 else if (PREDICT_FALSE (n_added > free_desc_count))
631 next = (next + n_added) & mask;
635 free_desc_count -= n_added;
638 if (n_left != n_vectors || n_buffers != n_buffers_left)
640 CLIB_MEMORY_STORE_BARRIER ();
641 vring->avail->idx = avail;
642 vring->desc_next = next;
643 vring->desc_in_use = used;
644 if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0)
645 virtio_kick (vm, vring, vif);
648 if (n_left && retry_count--)
654 static_always_inline u16
655 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
657 virtio_vring_t * vring, virtio_if_type_t type,
658 u32 * buffers, u16 n_left)
660 vnet_main_t *vnm = vnet_get_main ();
661 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
663 if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
664 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
665 buffers, n_left, 1 /* do_gso */ ,
666 1 /* checksum offload */ );
667 else if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD)
668 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
671 1 /* checksum offload */ );
673 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
676 0 /* no checksum offload */ );
679 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
680 vlib_node_runtime_t * node,
681 vlib_frame_t * frame)
683 virtio_main_t *nm = &virtio_main;
684 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
685 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
686 u16 qid = vm->thread_index % vif->num_txqs;
687 virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
688 u16 n_left = frame->n_vectors;
689 u32 *buffers = vlib_frame_vector_args (frame);
690 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
692 clib_spinlock_lock_if_init (&vring->lockp);
694 if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0 &&
695 (vring->last_kick_avail_idx != vring->avail->idx))
696 virtio_kick (vm, vring, vif);
698 if (vif->packet_coalesce)
700 n_left = vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
704 if (vif->type == VIRTIO_IF_TYPE_TAP)
705 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
706 VIRTIO_IF_TYPE_TAP, buffers, n_left);
707 else if (vif->type == VIRTIO_IF_TYPE_PCI)
708 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
709 VIRTIO_IF_TYPE_PCI, buffers, n_left);
710 else if (vif->type == VIRTIO_IF_TYPE_TUN)
711 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
712 VIRTIO_IF_TYPE_TUN, buffers, n_left);
716 if (vif->packet_buffering && n_left)
719 virtio_vring_buffering_store_packets (vring->buffering, buffers,
721 buffers += n_buffered;
722 n_left -= n_buffered;
725 virtio_interface_drop_inline (vm, node->node_index,
726 buffers + frame->n_vectors - n_left, n_left,
727 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
729 clib_spinlock_unlock_if_init (&vring->lockp);
731 return frame->n_vectors - n_left;
735 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
738 virtio_main_t *apm = &virtio_main;
739 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
740 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
742 /* Shut off redirection */
743 if (node_index == ~0)
745 vif->per_interface_next_index = node_index;
749 vif->per_interface_next_index =
750 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
755 virtio_clear_hw_interface_counters (u32 instance)
757 /* Nothing for now */
760 static clib_error_t *
761 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
762 vnet_hw_if_rx_mode mode)
764 vlib_main_t *vm = vnm->vlib_main;
765 virtio_main_t *mm = &virtio_main;
766 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
767 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
768 virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
770 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
772 rx_vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
773 return clib_error_return (0, "interrupt mode is not supported");
776 if (mode == VNET_HW_IF_RX_MODE_POLLING)
778 if (vif->packet_coalesce || vif->packet_buffering)
780 if (mm->interrupt_queues_count > 0)
781 mm->interrupt_queues_count--;
782 if (mm->interrupt_queues_count == 0)
783 vlib_process_signal_event (vm,
784 virtio_send_interrupt_node.index,
785 VIRTIO_EVENT_STOP_TIMER, 0);
787 rx_vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
791 if (vif->packet_coalesce || vif->packet_buffering)
793 mm->interrupt_queues_count++;
794 if (mm->interrupt_queues_count == 1)
795 vlib_process_signal_event (vm,
796 virtio_send_interrupt_node.index,
797 VIRTIO_EVENT_START_TIMER, 0);
799 rx_vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
802 rx_vring->mode = mode;
807 static clib_error_t *
808 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
810 virtio_main_t *mm = &virtio_main;
811 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
812 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
814 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
816 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
817 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
818 VNET_HW_INTERFACE_FLAG_LINK_UP);
822 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
823 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
828 static clib_error_t *
829 virtio_subif_add_del_function (vnet_main_t * vnm,
831 struct vnet_sw_interface_t *st, int is_add)
833 /* Nothing for now */
838 VNET_DEVICE_CLASS (virtio_device_class) = {
840 .format_device_name = format_virtio_device_name,
841 .format_device = format_virtio_device,
842 .format_tx_trace = format_virtio_tx_trace,
843 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
844 .tx_function_error_strings = virtio_tx_func_error_strings,
845 .rx_redirect_to_node = virtio_set_interface_next_node,
846 .clear_counters = virtio_clear_hw_interface_counters,
847 .admin_up_down_function = virtio_interface_admin_up_down,
848 .subif_add_del_function = virtio_subif_add_del_function,
849 .rx_mode_change_function = virtio_interface_rx_mode_change,
855 * fd.io coding-style-patch-verification: ON
858 * eval: (c-set-style "gnu")