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 vlib_buffer_t * b0, u32 bi, int is_tun)
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));
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_split (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 virtio_free_used_device_desc_packed (vlib_main_t * vm, virtio_vring_t * vring,
233 vring_packed_desc_t *d;
234 u16 sz = vring->size;
235 u16 last = vring->last_used_idx;
236 u16 n_buffers = 0, start;
239 if (vring->desc_in_use == 0)
242 d = &vring->packed_desc[last];
246 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
247 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
255 vring->used_wrap_counter ^= 1;
257 d = &vring->packed_desc[last];
263 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
264 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
265 vring->desc_in_use -= n_buffers;
266 vring->last_used_idx = last;
270 static_always_inline void
271 virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring,
272 uword node_index, int packed)
275 virtio_free_used_device_desc_packed (vm, vring, node_index);
277 virtio_free_used_device_desc_split (vm, vring, node_index);
281 static_always_inline void
282 set_checksum_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
285 if (b->flags & VNET_BUFFER_F_IS_IP4)
288 generic_header_offset_t gho = { 0 };
289 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
291 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
292 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
293 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
295 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
297 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
299 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
303 * virtio devices do not support IP4 checksum offload. So driver takes care
304 * of it while doing tx.
307 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
308 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
309 ip4->checksum = ip4_header_checksum (ip4);
311 else if (b->flags & VNET_BUFFER_F_IS_IP6)
313 generic_header_offset_t gho = { 0 };
314 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
316 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
317 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
318 if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
320 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
322 else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
324 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
329 static_always_inline void
330 set_gso_offsets (vlib_buffer_t * b, virtio_net_hdr_v1_t * hdr,
333 if (b->flags & VNET_BUFFER_F_IS_IP4)
336 generic_header_offset_t gho = { 0 };
337 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
339 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
340 hdr->gso_size = vnet_buffer2 (b)->gso_size;
341 hdr->hdr_len = gho.hdr_sz;
342 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
343 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
344 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
346 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
348 * virtio devices do not support IP4 checksum offload. So driver takes care
349 * of it while doing tx.
351 if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
352 ip4->checksum = ip4_header_checksum (ip4);
354 else if (b->flags & VNET_BUFFER_F_IS_IP6)
356 generic_header_offset_t gho = { 0 };
357 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
359 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
360 hdr->gso_size = vnet_buffer2 (b)->gso_size;
361 hdr->hdr_len = gho.hdr_sz;
362 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
363 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
364 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
368 static_always_inline u16
369 add_buffer_to_slot (vlib_main_t * vm, vlib_node_runtime_t * node,
370 virtio_vring_t * vring, u32 bi, u16 free_desc_count,
371 u16 avail, u16 next, u16 mask, int hdr_sz, int do_gso,
372 int csum_offload, int is_pci, int is_tun, int is_indirect,
378 d = &vring->desc[next];
379 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
380 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
381 u32 drop_inline = ~0;
383 clib_memset_u8 (hdr, 0, hdr_sz);
385 if (b->flags & VNET_BUFFER_F_GSO)
388 set_gso_offsets (b, hdr, is_l2);
391 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
395 else if (b->flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
396 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
399 set_checksum_offsets (b, hdr, is_l2);
402 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
407 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
409 virtio_tx_trace (vm, node, b, bi, is_tun);
412 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
414 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
415 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
416 d->len = b->current_length + hdr_sz;
419 else if (is_indirect)
422 * We are using single vlib_buffer_t for indirect descriptor(s)
423 * chain. Single descriptor is 16 bytes and vlib_buffer_t
424 * has 2048 bytes space. So maximum long chain can have 128
425 * (=2048/16) indirect descriptors.
426 * It can easily support 65535 bytes of Jumbo frames with
427 * each data buffer size of 512 bytes minimum.
429 u32 indirect_buffer = 0;
430 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
432 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
436 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
437 indirect_desc->current_data = 0;
438 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
439 indirect_desc->next_buffer = bi;
440 bi = indirect_buffer;
443 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
447 d->addr = vlib_physmem_get_pa (vm, id);
448 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
451 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
452 * should be presented in separate descriptor and data will start
453 * from next descriptor.
456 id->len = b->current_length + hdr_sz;
460 id->flags = VRING_DESC_F_NEXT;
464 id->addr = vlib_buffer_get_current_pa (vm, b);
465 id->len = b->current_length;
467 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
469 id->flags = VRING_DESC_F_NEXT;
473 b = vlib_get_buffer (vm, b->next_buffer);
474 id->addr = vlib_buffer_get_current_pa (vm, b);
475 id->len = b->current_length;
478 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
480 d->addr = pointer_to_uword (id);
481 /* first buffer in chain */
482 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
483 id->len = b->current_length + hdr_sz;
485 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
487 id->flags = VRING_DESC_F_NEXT;
491 b = vlib_get_buffer (vm, b->next_buffer);
492 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
493 id->len = b->current_length;
498 d->len = count * sizeof (vring_desc_t);
499 d->flags = VRING_DESC_F_INDIRECT;
504 vlib_buffer_t *b_temp = b;
505 u16 n_buffers_in_chain = 1;
508 * Check the length of the chain for the required number of
509 * descriptors. Return from here, retry to get more descriptors,
510 * if chain length is greater than available descriptors.
512 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
514 n_buffers_in_chain++;
515 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
518 if (n_buffers_in_chain > free_desc_count)
519 return n_buffers_in_chain;
521 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
522 d->len = b->current_length + hdr_sz;
524 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
526 d->flags = VRING_DESC_F_NEXT;
527 vring->buffers[count] = bi;
529 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
533 count = (count + 1) & mask;
535 d = &vring->desc[count];
536 b = vlib_get_buffer (vm, bi);
537 d->addr = vlib_buffer_get_current_pa (vm, b);
538 d->len = b->current_length;
541 vring->buffers[count] = bi;
542 vring->avail->ring[avail & mask] = next;
550 vring->buffers[next] = bi;
551 vring->avail->ring[avail & mask] = next;
555 if (drop_inline != ~0)
556 virtio_interface_drop_inline (vm, node->node_index, &bi, 1, drop_inline);
561 static_always_inline u16
562 add_buffer_to_slot_packed (vlib_main_t * vm, vlib_node_runtime_t * node,
563 virtio_vring_t * vring, u32 bi, u16 next,
564 int hdr_sz, int do_gso, int csum_offload,
565 int is_pci, int is_tun, int is_indirect,
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_TCP_CKSUM |
588 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
591 set_checksum_offsets (b, hdr, is_l2);
594 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
598 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
600 virtio_tx_trace (vm, node, b, bi, is_tun);
603 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
606 ((is_pci) ? vlib_buffer_get_current_pa (vm,
608 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
609 d->len = b->current_length + hdr_sz;
611 else if (is_indirect)
614 * We are using single vlib_buffer_t for indirect descriptor(s)
615 * chain. Single descriptor is 16 bytes and vlib_buffer_t
616 * has 2048 bytes space. So maximum long chain can have 128
617 * (=2048/16) indirect descriptors.
618 * It can easily support 65535 bytes of Jumbo frames with
619 * each data buffer size of 512 bytes minimum.
621 u32 indirect_buffer = 0;
622 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
624 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
628 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
629 indirect_desc->current_data = 0;
630 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
631 indirect_desc->next_buffer = bi;
632 bi = indirect_buffer;
634 vring_packed_desc_t *id =
635 (vring_packed_desc_t *) vlib_buffer_get_current (indirect_desc);
639 d->addr = vlib_physmem_get_pa (vm, id);
640 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
643 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
644 * should be presented in separate descriptor and data will start
645 * from next descriptor.
648 id->len = b->current_length + hdr_sz;
656 id->addr = vlib_buffer_get_current_pa (vm, b);
657 id->len = b->current_length;
659 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
665 b = vlib_get_buffer (vm, b->next_buffer);
666 id->addr = vlib_buffer_get_current_pa (vm, b);
667 id->len = b->current_length;
672 d->len = count * sizeof (vring_packed_desc_t);
673 flags = VRING_DESC_F_INDIRECT;
679 if (vring->avail_wrap_counter)
681 flags |= VRING_DESC_F_AVAIL;
682 flags &= ~VRING_DESC_F_USED;
686 flags &= ~VRING_DESC_F_AVAIL;
687 flags |= VRING_DESC_F_USED;
692 vring->buffers[next] = bi;
696 if (drop_inline != ~0)
697 virtio_interface_drop_inline (vm, node->node_index, &bi, 1, drop_inline);
702 static_always_inline uword
703 virtio_interface_tx_packed_gso_inline (vlib_main_t * vm,
704 vlib_node_runtime_t * node,
706 virtio_if_type_t type,
707 virtio_vring_t * vring,
708 u32 * buffers, u16 n_left,
710 const int csum_offload)
712 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
713 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
715 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
717 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
718 const int hdr_sz = vif->virtio_net_hdr_sz;
719 u16 sz = vring->size;
720 u16 used, next, n_buffers = 0, n_buffers_left = 0;
721 u16 n_vectors = n_left;
724 used = vring->desc_in_use;
725 next = vring->desc_next;
727 if (vif->packet_buffering)
729 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
731 while (n_buffers_left && used < sz)
735 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
738 n_added = add_buffer_to_slot_packed (vm, node,
740 hdr_sz, do_gso, csum_offload,
741 is_pci, is_tun, is_indirect,
744 if (PREDICT_FALSE (n_added == 0))
752 vring->avail_wrap_counter ^= 1;
757 while (n_left && used < sz)
761 n_added = add_buffer_to_slot_packed (vm, node,
762 vring, buffers[0], next,
763 hdr_sz, do_gso, csum_offload,
764 is_pci, is_tun, is_indirect,
768 if (PREDICT_FALSE (n_added == 0))
776 vring->avail_wrap_counter ^= 1;
780 if (n_left != n_vectors || n_buffers != n_buffers_left)
782 CLIB_MEMORY_STORE_BARRIER ();
783 vring->desc_next = next;
784 vring->desc_in_use = used;
785 CLIB_MEMORY_BARRIER ();
786 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
787 virtio_kick (vm, vring, vif);
793 static_always_inline void
794 virtio_find_free_desc (virtio_vring_t * vring, u16 size, u16 mask,
795 u16 req, u16 next, u32 * first_free_desc_index,
796 u16 * free_desc_count)
799 /* next is used as hint: from where to start looking */
800 for (u16 i = 0; i < size; i++, next++)
802 if (vring->buffers[next & mask] == ~0)
804 if (*first_free_desc_index == ~0)
806 *first_free_desc_index = (next & mask);
808 (*free_desc_count)++;
815 if (start + *free_desc_count == i)
817 (*free_desc_count)++;
829 static_always_inline u16
830 virtio_interface_tx_split_gso_inline (vlib_main_t * vm,
831 vlib_node_runtime_t * node,
833 virtio_if_type_t type,
834 virtio_vring_t * vring, u32 * buffers,
835 u16 n_left, int do_gso,
838 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
839 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
840 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
842 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
844 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
845 u16 sz = vring->size;
846 int hdr_sz = vif->virtio_net_hdr_sz;
848 u16 n_vectors = n_left;
850 used = vring->desc_in_use;
851 next = vring->desc_next;
852 avail = vring->avail->idx;
854 u16 free_desc_count = 0;
856 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
858 u32 first_free_desc_index = ~0;
860 virtio_find_free_desc (vring, sz, mask, n_left, next,
861 &first_free_desc_index, &free_desc_count);
864 next = first_free_desc_index;
867 free_desc_count = sz - used;
869 if (vif->packet_buffering)
871 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
873 while (n_buffers_left && free_desc_count)
877 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
881 n_added = add_buffer_to_slot (vm, node, vring, bi, free_desc_count,
882 avail, next, mask, hdr_sz, do_gso,
883 csum_offload, is_pci, is_tun,
884 is_indirect, is_any_layout);
885 if (PREDICT_FALSE (n_added == 0))
890 else if (PREDICT_FALSE (n_added > free_desc_count))
894 next = (next + n_added) & mask;
897 free_desc_count -= n_added;
901 while (n_left && free_desc_count)
905 n_added = add_buffer_to_slot (vm, node, vring, buffers[0],
906 free_desc_count, avail, next, mask,
907 hdr_sz, do_gso, csum_offload, is_pci,
908 is_tun, is_indirect, is_any_layout);
910 if (PREDICT_FALSE (n_added == 0))
916 else if (PREDICT_FALSE (n_added > free_desc_count))
920 next = (next + n_added) & mask;
924 free_desc_count -= n_added;
927 if (n_left != n_vectors || n_buffers != n_buffers_left)
929 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
930 vring->desc_next = next;
931 vring->desc_in_use = used;
932 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
933 VRING_USED_F_NO_NOTIFY) == 0)
934 virtio_kick (vm, vring, vif);
940 static_always_inline u16
941 virtio_interface_tx_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
943 virtio_if_type_t type, virtio_vring_t * vring,
944 u32 * buffers, u16 n_left, int packed,
945 int do_gso, int csum_offload)
948 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
950 do_gso, csum_offload);
952 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
954 do_gso, csum_offload);
957 static_always_inline u16
958 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
960 virtio_vring_t * vring, virtio_if_type_t type,
961 u32 * buffers, u16 n_left, int packed)
963 vnet_main_t *vnm = vnet_get_main ();
964 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
966 if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
967 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
968 buffers, n_left, packed,
970 1 /* checksum offload */ );
971 else if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD)
972 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
973 buffers, n_left, packed,
975 1 /* checksum offload */ );
977 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
978 buffers, n_left, packed,
980 0 /* no checksum offload */ );
983 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
984 vlib_node_runtime_t * node,
985 vlib_frame_t * frame)
987 virtio_main_t *nm = &virtio_main;
988 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
989 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
990 u16 qid = vm->thread_index % vif->num_txqs;
991 virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
992 u16 n_left = frame->n_vectors;
993 u32 *buffers = vlib_frame_vector_args (frame);
994 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
995 int packed = vif->is_packed;
996 u16 n_vectors = frame->n_vectors;
998 clib_spinlock_lock_if_init (&vring->lockp);
1000 if (vif->packet_coalesce)
1002 n_vectors = n_left =
1003 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1007 u16 retry_count = 2;
1010 /* free consumed buffers */
1011 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1013 if (vif->type == VIRTIO_IF_TYPE_TAP)
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_PCI)
1019 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1021 &buffers[n_vectors - n_left],
1023 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1024 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1026 &buffers[n_vectors - n_left],
1031 if (n_left && retry_count--)
1034 if (vif->packet_buffering && n_left)
1036 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1041 n_left -= n_buffered;
1044 virtio_interface_drop_inline (vm, node->node_index,
1045 &buffers[n_vectors - n_left], n_left,
1046 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1048 clib_spinlock_unlock_if_init (&vring->lockp);
1050 return frame->n_vectors - n_left;
1054 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1057 virtio_main_t *apm = &virtio_main;
1058 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1059 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1061 /* Shut off redirection */
1062 if (node_index == ~0)
1064 vif->per_interface_next_index = node_index;
1068 vif->per_interface_next_index =
1069 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1074 virtio_clear_hw_interface_counters (u32 instance)
1076 /* Nothing for now */
1079 static_always_inline void
1080 virtio_set_rx_interrupt (virtio_if_t * vif, virtio_vring_t * vring)
1083 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1085 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1088 static_always_inline void
1089 virtio_set_rx_polling (virtio_if_t * vif, virtio_vring_t * vring)
1092 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1094 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1097 static clib_error_t *
1098 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1099 vnet_hw_if_rx_mode mode)
1101 vlib_main_t *vm = vnm->vlib_main;
1102 virtio_main_t *mm = &virtio_main;
1103 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1104 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1105 virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1107 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1109 virtio_set_rx_polling (vif, rx_vring);
1110 return clib_error_return (0, "interrupt mode is not supported");
1113 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1115 if (vif->packet_coalesce || vif->packet_buffering)
1117 if (mm->interrupt_queues_count > 0)
1118 mm->interrupt_queues_count--;
1119 if (mm->interrupt_queues_count == 0)
1120 vlib_process_signal_event (vm,
1121 virtio_send_interrupt_node.index,
1122 VIRTIO_EVENT_STOP_TIMER, 0);
1124 virtio_set_rx_polling (vif, rx_vring);
1128 if (vif->packet_coalesce || vif->packet_buffering)
1130 mm->interrupt_queues_count++;
1131 if (mm->interrupt_queues_count == 1)
1132 vlib_process_signal_event (vm,
1133 virtio_send_interrupt_node.index,
1134 VIRTIO_EVENT_START_TIMER, 0);
1136 virtio_set_rx_interrupt (vif, rx_vring);
1139 rx_vring->mode = mode;
1144 static clib_error_t *
1145 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1147 virtio_main_t *mm = &virtio_main;
1148 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1149 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1151 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1153 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1154 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1155 VNET_HW_INTERFACE_FLAG_LINK_UP);
1159 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1160 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1165 static clib_error_t *
1166 virtio_subif_add_del_function (vnet_main_t * vnm,
1168 struct vnet_sw_interface_t *st, int is_add)
1170 /* Nothing for now */
1175 VNET_DEVICE_CLASS (virtio_device_class) = {
1177 .format_device_name = format_virtio_device_name,
1178 .format_device = format_virtio_device,
1179 .format_tx_trace = format_virtio_tx_trace,
1180 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1181 .tx_function_error_strings = virtio_tx_func_error_strings,
1182 .rx_redirect_to_node = virtio_set_interface_next_node,
1183 .clear_counters = virtio_clear_hw_interface_counters,
1184 .admin_up_down_function = virtio_interface_admin_up_down,
1185 .subif_add_del_function = virtio_subif_add_del_function,
1186 .rx_mode_change_function = virtio_interface_rx_mode_change,
1192 * fd.io coding-style-patch-verification: ON
1195 * eval: (c-set-style "gnu")