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,
78 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, "%U ", format_generic_header_offset, &t->gho);
90 s = format (s, "%Ubuffer 0x%x: %U",
91 format_white_space, indent,
92 t->buffer_index, format_vnet_buffer, &t->buffer);
94 s = format (s, "\n%U%U", format_white_space, indent,
95 format_ethernet_header_with_length, t->buffer.pre_data,
96 sizeof (t->buffer.pre_data));
100 static_always_inline void
101 virtio_interface_drop_inline (vlib_main_t * vm, uword node_index,
102 u32 * buffers, u16 n,
103 virtio_tx_func_error_t error)
105 vlib_error_count (vm, node_index, error, n);
106 vlib_buffer_free (vm, buffers, n);
109 static_always_inline void
110 virtio_memset_ring_u32 (u32 * ring, u32 start, u32 ring_size, u32 n_buffers)
112 ASSERT (n_buffers <= ring_size);
114 if (PREDICT_TRUE (start + n_buffers <= ring_size))
116 clib_memset_u32 (ring + start, ~0, n_buffers);
120 clib_memset_u32 (ring + start, ~0, ring_size - start);
121 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
125 static_always_inline void
126 virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring,
129 u16 used = vring->desc_in_use;
130 u16 sz = vring->size;
132 u16 last = vring->last_used_idx;
133 u16 n_left = vring->used->idx - last;
134 u16 out_of_order_count = 0;
141 vring_used_elem_t *e = &vring->used->ring[last & mask];
143 slot = n_buffers = e->id;
145 while (e->id == (n_buffers & mask))
150 vring_desc_t *d = &vring->desc[e->id];
152 while (d->flags & VRING_DESC_F_NEXT)
156 d = &vring->desc[next];
160 e = &vring->used->ring[last & mask];
162 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
163 sz, (n_buffers - slot));
164 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
165 used -= (n_buffers - slot);
169 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
170 vring->buffers[e->id] = ~0;
174 out_of_order_count++;
175 vring->flags |= VRING_TX_OUT_OF_ORDER;
180 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
181 * It impacts the overall virtio-performance.
183 if (out_of_order_count)
184 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
187 vring->desc_in_use = used;
188 vring->last_used_idx = last;
191 static_always_inline void
192 set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2)
194 if (b->flags & VNET_BUFFER_F_IS_IP4)
197 generic_header_offset_t gho = { 0 };
198 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
200 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
201 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
202 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
204 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
206 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
208 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
212 * virtio devices do not support IP4 checksum offload. So driver takes care
213 * of it while doing tx.
216 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
217 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
218 ip4->checksum = ip4_header_checksum (ip4);
220 else if (b->flags & VNET_BUFFER_F_IS_IP6)
222 generic_header_offset_t gho = { 0 };
223 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
225 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
226 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
227 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
229 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
231 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
233 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
238 static_always_inline void
239 set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr, int is_l2)
241 if (b->flags & VNET_BUFFER_F_IS_IP4)
244 generic_header_offset_t gho = { 0 };
245 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
247 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
248 hdr->gso_size = vnet_buffer2 (b)->gso_size;
249 hdr->hdr_len = gho.hdr_sz;
250 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
251 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
252 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
254 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
256 * virtio devices do not support IP4 checksum offload. So driver takes care
257 * of it while doing tx.
259 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
260 ip4->checksum = ip4_header_checksum (ip4);
262 else if (b->flags & VNET_BUFFER_F_IS_IP6)
264 generic_header_offset_t gho = { 0 };
265 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
267 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
268 hdr->gso_size = vnet_buffer2 (b)->gso_size;
269 hdr->hdr_len = gho.hdr_sz;
270 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
271 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
272 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
276 static_always_inline u16
277 add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif,
278 virtio_if_type_t type, virtio_vring_t * vring,
279 u32 bi, u16 free_desc_count,
280 u16 avail, u16 next, u16 mask, int do_gso,
281 int csum_offload, uword node_index)
284 int hdr_sz = vif->virtio_net_hdr_sz;
286 d = &vring->desc[next];
287 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
288 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
289 int is_l2 = (type & (VIRTIO_IF_TYPE_TAP | VIRTIO_IF_TYPE_PCI));
291 clib_memset (hdr, 0, hdr_sz);
293 if (b->flags & VNET_BUFFER_F_GSO)
296 set_gso_offsets (b, hdr, is_l2);
299 virtio_interface_drop_inline (vm, node_index, &bi, 1,
300 VIRTIO_TX_ERROR_GSO_PACKET_DROP);
304 else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
305 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
308 set_checksum_offsets (b, hdr, is_l2);
311 virtio_interface_drop_inline (vm, node_index, &bi, 1,
312 VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP);
317 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
320 ((type == VIRTIO_IF_TYPE_PCI) ? vlib_buffer_get_current_pa (vm,
322 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
323 d->len = b->current_length + hdr_sz;
326 else if (vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC))
329 * We are using single vlib_buffer_t for indirect descriptor(s)
330 * chain. Single descriptor is 16 bytes and vlib_buffer_t
331 * has 2048 bytes space. So maximum long chain can have 128
332 * (=2048/16) indirect descriptors.
333 * It can easily support 65535 bytes of Jumbo frames with
334 * each data buffer size of 512 bytes minimum.
336 u32 indirect_buffer = 0;
337 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
339 virtio_interface_drop_inline (vm, node_index, &bi, 1,
340 VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED);
344 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
345 indirect_desc->current_data = 0;
346 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
347 indirect_desc->next_buffer = bi;
348 bi = indirect_buffer;
351 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
353 if (type == VIRTIO_IF_TYPE_PCI)
355 d->addr = vlib_physmem_get_pa (vm, id);
356 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
359 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
360 * should be presented in separate descriptor and data will start
361 * from next descriptor.
364 (vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)))
365 id->len = b->current_length + hdr_sz;
369 id->flags = VRING_DESC_F_NEXT;
373 id->addr = vlib_buffer_get_current_pa (vm, b);
374 id->len = b->current_length;
376 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
378 id->flags = VRING_DESC_F_NEXT;
382 b = vlib_get_buffer (vm, b->next_buffer);
383 id->addr = vlib_buffer_get_current_pa (vm, b);
384 id->len = b->current_length;
387 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
389 d->addr = pointer_to_uword (id);
390 /* first buffer in chain */
391 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
392 id->len = b->current_length + hdr_sz;
394 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
396 id->flags = VRING_DESC_F_NEXT;
400 b = vlib_get_buffer (vm, b->next_buffer);
401 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
402 id->len = b->current_length;
407 d->len = count * sizeof (vring_desc_t);
408 d->flags = VRING_DESC_F_INDIRECT;
410 else if (type == VIRTIO_IF_TYPE_PCI)
413 vlib_buffer_t *b_temp = b;
414 u16 n_buffers_in_chain = 1;
417 * Check the length of the chain for the required number of
418 * descriptors. Return from here, retry to get more descriptors,
419 * if chain length is greater than available descriptors.
421 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
423 n_buffers_in_chain++;
424 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
427 if (n_buffers_in_chain > free_desc_count)
428 return n_buffers_in_chain;
430 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
431 d->len = b->current_length + hdr_sz;
433 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
435 d->flags = VRING_DESC_F_NEXT;
436 vring->buffers[count] = bi;
438 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
442 count = (count + 1) & mask;
444 d = &vring->desc[count];
445 b = vlib_get_buffer (vm, bi);
446 d->addr = vlib_buffer_get_current_pa (vm, b);
447 d->len = b->current_length;
450 vring->buffers[count] = bi;
451 vring->avail->ring[avail & mask] = next;
459 vring->buffers[next] = bi;
460 vring->avail->ring[avail & mask] = next;
465 static_always_inline void
466 virtio_find_free_desc (virtio_vring_t * vring, u16 size, u16 mask,
467 u16 req, u16 next, u32 * first_free_desc_index,
468 u16 * free_desc_count)
471 /* next is used as hint: from where to start looking */
472 for (u16 i = 0; i < size; i++, next++)
474 if (vring->buffers[next & mask] == ~0)
476 if (*first_free_desc_index == ~0)
478 *first_free_desc_index = (next & mask);
480 (*free_desc_count)++;
487 if (start + *free_desc_count == i)
489 (*free_desc_count)++;
501 static_always_inline uword
502 virtio_interface_tx_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
503 vlib_frame_t * frame, virtio_if_t * vif,
504 virtio_if_type_t type, int do_gso,
505 int csum_offload, int do_gro)
507 u16 n_left = frame->n_vectors;
508 virtio_vring_t *vring;
509 u16 qid = vm->thread_index % vif->num_txqs;
510 vring = vec_elt_at_index (vif->txq_vrings, qid);
511 u16 used, next, avail;
512 u16 sz = vring->size;
515 u32 *buffers = vlib_frame_vector_args (frame);
516 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
518 clib_spinlock_lock_if_init (&vring->lockp);
520 if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0 &&
521 (vring->last_kick_avail_idx != vring->avail->idx))
522 virtio_kick (vm, vring, vif);
526 n_left = vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
531 /* free consumed buffers */
532 virtio_free_used_device_desc (vm, vring, node->node_index);
534 used = vring->desc_in_use;
535 next = vring->desc_next;
536 avail = vring->avail->idx;
538 u16 free_desc_count = 0;
540 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
542 u32 first_free_desc_index = ~0;
544 virtio_find_free_desc (vring, sz, mask, n_left, next,
545 &first_free_desc_index, &free_desc_count);
548 next = first_free_desc_index;
551 free_desc_count = sz - used;
553 while (n_left && free_desc_count)
556 virtio_tx_trace_t *t;
558 vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
559 if (b0->flags & VLIB_BUFFER_IS_TRACED)
561 t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
562 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
563 t->buffer_index = buffers[0];
564 if (type == VIRTIO_IF_TYPE_TUN)
566 int is_ip4 = 0, is_ip6 = 0;
568 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
579 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4,
583 vnet_generic_header_offset_parser (b0, &t->gho, 1,
585 VNET_BUFFER_F_IS_IP4,
587 VNET_BUFFER_F_IS_IP6);
589 clib_memcpy_fast (&t->buffer, b0,
590 sizeof (*b0) - sizeof (b0->pre_data));
591 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
592 sizeof (t->buffer.pre_data));
595 add_buffer_to_slot (vm, vif, type, vring, buffers[0], free_desc_count,
596 avail, next, mask, do_gso, csum_offload,
599 if (PREDICT_FALSE (n_added == 0))
605 else if (PREDICT_FALSE (n_added > free_desc_count))
609 next = (next + n_added) & mask;
613 free_desc_count -= n_added;
616 if (n_left != frame->n_vectors)
618 CLIB_MEMORY_STORE_BARRIER ();
619 vring->avail->idx = avail;
620 vring->desc_next = next;
621 vring->desc_in_use = used;
622 if ((vring->used->flags & VRING_USED_F_NO_NOTIFY) == 0)
623 virtio_kick (vm, vring, vif);
631 virtio_interface_drop_inline (vm, node->node_index,
633 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
636 clib_spinlock_unlock_if_init (&vring->lockp);
638 return frame->n_vectors - n_left;
641 static_always_inline uword
642 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
643 vlib_frame_t * frame, virtio_if_t * vif,
644 virtio_if_type_t type)
646 vnet_main_t *vnm = vnet_get_main ();
647 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
649 if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
650 return virtio_interface_tx_gso_inline (vm, node, frame, vif, type,
652 1 /* checksum offload */ ,
653 vif->packet_coalesce);
654 else if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD)
655 return virtio_interface_tx_gso_inline (vm, node, frame, vif, type,
657 1 /* checksum offload */ ,
660 return virtio_interface_tx_gso_inline (vm, node, frame, vif, type,
662 0 /* no checksum offload */ ,
666 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
667 vlib_node_runtime_t * node,
668 vlib_frame_t * frame)
670 virtio_main_t *nm = &virtio_main;
671 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
672 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
674 if (vif->type == VIRTIO_IF_TYPE_TAP)
675 return virtio_interface_tx_inline (vm, node, frame, vif,
677 else if (vif->type == VIRTIO_IF_TYPE_PCI)
678 return virtio_interface_tx_inline (vm, node, frame, vif,
680 else if (vif->type == VIRTIO_IF_TYPE_TUN)
681 return virtio_interface_tx_inline (vm, node, frame, vif,
690 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
693 virtio_main_t *apm = &virtio_main;
694 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
695 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
697 /* Shut off redirection */
698 if (node_index == ~0)
700 vif->per_interface_next_index = node_index;
704 vif->per_interface_next_index =
705 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
710 virtio_clear_hw_interface_counters (u32 instance)
712 /* Nothing for now */
715 static clib_error_t *
716 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
717 vnet_hw_interface_rx_mode mode)
719 virtio_main_t *mm = &virtio_main;
720 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
721 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
722 virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, qid);
724 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
726 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
727 return clib_error_return (0, "interrupt mode is not supported");
730 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
732 /* only enable packet coalesce in poll mode */
733 gro_flow_table_set_is_enable (vring->flow_table, 1);
734 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
738 gro_flow_table_set_is_enable (vring->flow_table, 0);
739 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
745 static clib_error_t *
746 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
748 virtio_main_t *mm = &virtio_main;
749 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
750 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
752 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
754 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
755 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
756 VNET_HW_INTERFACE_FLAG_LINK_UP);
760 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
761 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
766 static clib_error_t *
767 virtio_subif_add_del_function (vnet_main_t * vnm,
769 struct vnet_sw_interface_t *st, int is_add)
771 /* Nothing for now */
776 VNET_DEVICE_CLASS (virtio_device_class) = {
778 .format_device_name = format_virtio_device_name,
779 .format_device = format_virtio_device,
780 .format_tx_trace = format_virtio_tx_trace,
781 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
782 .tx_function_error_strings = virtio_tx_func_error_strings,
783 .rx_redirect_to_node = virtio_set_interface_next_node,
784 .clear_counters = virtio_clear_hw_interface_counters,
785 .admin_up_down_function = virtio_interface_admin_up_down,
786 .subif_add_del_function = virtio_subif_add_del_function,
787 .rx_mode_change_function = virtio_interface_rx_mode_change,
793 * fd.io coding-style-patch-verification: ON
796 * eval: (c-set-style "gnu")