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 VIRTIO_TX_MAX_CHAIN_LEN 127
36 #define foreach_virtio_tx_func_error \
37 _(NO_FREE_SLOTS, "no free tx slots") \
38 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
39 _(PENDING_MSGS, "pending msgs in tx ring") \
40 _(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \
41 _(OUT_OF_ORDER, "out-of-order buffers in used ring") \
42 _(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \
43 _(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop")
47 #define _(f,s) VIRTIO_TX_ERROR_##f,
48 foreach_virtio_tx_func_error
51 } virtio_tx_func_error_t;
53 static char *virtio_tx_func_error_strings[] = {
55 foreach_virtio_tx_func_error
60 format_virtio_device (u8 * s, va_list * args)
62 u32 dev_instance = va_arg (*args, u32);
63 int verbose = va_arg (*args, int);
64 u32 indent = format_get_indent (s);
66 s = format (s, "VIRTIO interface");
69 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
79 generic_header_offset_t gho;
84 format_virtio_tx_trace (u8 * s, va_list * va)
86 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
87 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
88 virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
89 u32 indent = format_get_indent (s);
91 s = format (s, "%Ubuffer 0x%x: %U\n",
92 format_white_space, indent,
93 t->buffer_index, format_vnet_buffer, &t->buffer);
95 format (s, "%U%U\n", format_white_space, indent,
96 format_generic_header_offset, &t->gho);
98 format (s, "%U%U", format_white_space, indent,
99 format_ethernet_header_with_length, t->buffer.pre_data,
100 sizeof (t->buffer.pre_data));
105 virtio_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b0,
108 virtio_tx_trace_t *t;
109 t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
110 t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
111 t->buffer_index = bi;
114 int is_ip4 = 0, is_ip6 = 0;
116 switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
127 vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
130 vnet_generic_header_offset_parser (b0, &t->gho, 1,
132 VNET_BUFFER_F_IS_IP4,
133 b0->flags & VNET_BUFFER_F_IS_IP6);
135 clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
136 clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
137 sizeof (t->buffer.pre_data));
141 virtio_interface_drop_inline (vlib_main_t *vm, virtio_if_t *vif,
142 uword node_index, u32 *buffers, u16 n,
143 virtio_tx_func_error_t error)
145 vlib_error_count (vm, node_index, error, n);
146 vlib_increment_simple_counter (vnet_main.interface_main.sw_if_counters +
147 VNET_INTERFACE_COUNTER_DROP,
148 vm->thread_index, vif->sw_if_index, n);
149 vlib_buffer_free (vm, buffers, n);
153 virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
155 ASSERT (n_buffers <= ring_size);
157 if (PREDICT_TRUE (start + n_buffers <= ring_size))
159 clib_memset_u32 (ring + start, ~0, n_buffers);
163 clib_memset_u32 (ring + start, ~0, ring_size - start);
164 clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
169 virtio_free_used_device_desc_split (vlib_main_t *vm, virtio_vring_t *vring,
172 u16 used = vring->desc_in_use;
173 u16 sz = vring->size;
175 u16 last = vring->last_used_idx;
176 u16 n_left = vring->used->idx - last;
177 u16 out_of_order_count = 0;
184 vring_used_elem_t *e = &vring->used->ring[last & mask];
186 slot = n_buffers = e->id;
188 while (e->id == (n_buffers & mask))
193 vring_desc_t *d = &vring->desc[e->id];
195 while (d->flags & VRING_DESC_F_NEXT)
199 d = &vring->desc[next];
203 e = &vring->used->ring[last & mask];
205 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
206 sz, (n_buffers - slot));
207 virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
208 used -= (n_buffers - slot);
212 vlib_buffer_free (vm, &vring->buffers[e->id], 1);
213 vring->buffers[e->id] = ~0;
217 out_of_order_count++;
218 vring->flags |= VRING_TX_OUT_OF_ORDER;
223 * Some vhost-backends give buffers back in out-of-order fashion in used ring.
224 * It impacts the overall virtio-performance.
226 if (out_of_order_count)
227 vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
230 vring->desc_in_use = used;
231 vring->last_used_idx = last;
235 virtio_free_used_device_desc_packed (vlib_main_t *vm, virtio_vring_t *vring,
238 vring_packed_desc_t *d;
239 u16 sz = vring->size;
240 u16 last = vring->last_used_idx;
241 u16 n_buffers = 0, start;
244 if (vring->desc_in_use == 0)
247 d = &vring->packed_desc[last];
251 while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
252 (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
260 vring->used_wrap_counter ^= 1;
262 d = &vring->packed_desc[last];
268 vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
269 virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
270 vring->desc_in_use -= n_buffers;
271 vring->last_used_idx = last;
276 virtio_free_used_device_desc (vlib_main_t *vm, virtio_vring_t *vring,
277 uword node_index, int packed)
280 virtio_free_used_device_desc_packed (vm, vring, node_index);
282 virtio_free_used_device_desc_split (vm, vring, node_index);
287 set_checksum_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr,
290 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
292 if (b->flags & VNET_BUFFER_F_IS_IP4)
295 generic_header_offset_t gho = { 0 };
296 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
298 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
299 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
300 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
302 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
304 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
306 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
310 * virtio devices do not support IP4 checksum offload. So driver takes care
311 * of it while doing tx.
314 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
315 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
316 ip4->checksum = ip4_header_checksum (ip4);
318 else if (b->flags & VNET_BUFFER_F_IS_IP6)
320 generic_header_offset_t gho = { 0 };
321 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
323 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
324 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
325 if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
327 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
329 else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
331 hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
337 set_gso_offsets (vlib_buffer_t *b, virtio_net_hdr_v1_t *hdr, const int is_l2)
339 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
341 if (b->flags & VNET_BUFFER_F_IS_IP4)
344 generic_header_offset_t gho = { 0 };
345 vnet_generic_header_offset_parser (b, &gho, is_l2, 1 /* ip4 */ ,
347 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
348 hdr->gso_size = vnet_buffer2 (b)->gso_size;
349 hdr->hdr_len = gho.hdr_sz;
350 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
351 hdr->csum_start = gho.l4_hdr_offset; // 0x22;
352 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
354 (ip4_header_t *) (vlib_buffer_get_current (b) + gho.l3_hdr_offset);
356 * virtio devices do not support IP4 checksum offload. So driver takes care
357 * of it while doing tx.
359 if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
360 ip4->checksum = ip4_header_checksum (ip4);
362 else if (b->flags & VNET_BUFFER_F_IS_IP6)
364 generic_header_offset_t gho = { 0 };
365 vnet_generic_header_offset_parser (b, &gho, is_l2, 0 /* ip4 */ ,
367 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
368 hdr->gso_size = vnet_buffer2 (b)->gso_size;
369 hdr->hdr_len = gho.hdr_sz;
370 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
371 hdr->csum_start = gho.l4_hdr_offset; // 0x36;
372 hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
377 add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
378 virtio_if_t *vif, virtio_vring_t *vring, u32 bi,
379 u16 free_desc_count, u16 avail, u16 next, u16 mask,
380 int hdr_sz, int do_gso, int csum_offload, int is_pci,
381 int is_tun, int is_indirect, int is_any_layout)
386 d = &vring->desc[next];
387 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
388 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
389 u32 drop_inline = ~0;
391 clib_memset_u8 (hdr, 0, hdr_sz);
393 if (b->flags & VNET_BUFFER_F_GSO)
396 set_gso_offsets (b, hdr, is_l2);
399 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
403 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
406 set_checksum_offsets (b, hdr, is_l2);
409 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
414 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
416 virtio_tx_trace (vm, node, b, bi, is_tun);
419 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
421 d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
422 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
423 d->len = b->current_length + hdr_sz;
426 else if (is_indirect)
429 * We are using single vlib_buffer_t for indirect descriptor(s)
430 * chain. Single descriptor is 16 bytes and vlib_buffer_t
431 * has 2048 bytes space. So maximum long chain can have 128
432 * (=2048/16) indirect descriptors.
433 * It can easily support 65535 bytes of Jumbo frames with
434 * each data buffer size of 512 bytes minimum.
436 u32 indirect_buffer = 0;
437 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
439 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
443 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
444 indirect_desc->current_data = 0;
445 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
446 indirect_desc->next_buffer = bi;
447 bi = indirect_buffer;
450 (vring_desc_t *) vlib_buffer_get_current (indirect_desc);
454 d->addr = vlib_physmem_get_pa (vm, id);
455 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
458 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
459 * should be presented in separate descriptor and data will start
460 * from next descriptor.
463 id->len = b->current_length + hdr_sz;
467 id->flags = VRING_DESC_F_NEXT;
471 id->addr = vlib_buffer_get_current_pa (vm, b);
472 id->len = b->current_length;
474 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
476 id->flags = VRING_DESC_F_NEXT;
480 b = vlib_get_buffer (vm, b->next_buffer);
481 id->addr = vlib_buffer_get_current_pa (vm, b);
482 id->len = b->current_length;
483 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
485 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
486 vlib_error_count (vm, node->node_index,
487 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
492 else /* VIRTIO_IF_TYPE_[TAP | TUN] */
494 d->addr = pointer_to_uword (id);
495 /* first buffer in chain */
496 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
497 id->len = b->current_length + hdr_sz;
499 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
501 id->flags = VRING_DESC_F_NEXT;
505 b = vlib_get_buffer (vm, b->next_buffer);
506 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
507 id->len = b->current_length;
508 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
510 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
511 vlib_error_count (vm, node->node_index,
512 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
519 d->len = count * sizeof (vring_desc_t);
520 d->flags = VRING_DESC_F_INDIRECT;
525 vlib_buffer_t *b_temp = b;
526 u16 n_buffers_in_chain = 1;
529 * Check the length of the chain for the required number of
530 * descriptors. Return from here, retry to get more descriptors,
531 * if chain length is greater than available descriptors.
533 while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
535 n_buffers_in_chain++;
536 b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
539 if (n_buffers_in_chain > free_desc_count)
540 return n_buffers_in_chain;
542 d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
543 d->len = b->current_length + hdr_sz;
545 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
547 d->flags = VRING_DESC_F_NEXT;
548 vring->buffers[count] = bi;
550 ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
554 count = (count + 1) & mask;
556 d = &vring->desc[count];
557 b = vlib_get_buffer (vm, bi);
558 d->addr = vlib_buffer_get_current_pa (vm, b);
559 d->len = b->current_length;
562 vring->buffers[count] = bi;
563 vring->avail->ring[avail & mask] = next;
571 vring->buffers[next] = bi;
572 vring->avail->ring[avail & mask] = next;
576 if (drop_inline != ~0)
577 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
584 add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
585 virtio_if_t *vif, virtio_vring_t *vring, u32 bi,
586 u16 next, int hdr_sz, int do_gso, int csum_offload,
587 int is_pci, int is_tun, int is_indirect,
590 u16 n_added = 0, flags = 0;
592 vring_packed_desc_t *d = &vring->packed_desc[next];
593 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
594 virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
595 u32 drop_inline = ~0;
597 clib_memset (hdr, 0, hdr_sz);
599 if (b->flags & VNET_BUFFER_F_GSO)
602 set_gso_offsets (b, hdr, is_l2);
605 drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
609 else if (b->flags & VNET_BUFFER_F_OFFLOAD)
612 set_checksum_offsets (b, hdr, is_l2);
615 drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
619 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
621 virtio_tx_trace (vm, node, b, bi, is_tun);
624 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
627 ((is_pci) ? vlib_buffer_get_current_pa (vm,
629 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
630 d->len = b->current_length + hdr_sz;
632 else if (is_indirect)
635 * We are using single vlib_buffer_t for indirect descriptor(s)
636 * chain. Single descriptor is 16 bytes and vlib_buffer_t
637 * has 2048 bytes space. So maximum long chain can have 128
638 * (=2048/16) indirect descriptors.
639 * It can easily support 65535 bytes of Jumbo frames with
640 * each data buffer size of 512 bytes minimum.
642 u32 indirect_buffer = 0;
643 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
645 drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
649 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
650 indirect_desc->current_data = 0;
651 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
652 indirect_desc->next_buffer = bi;
653 bi = indirect_buffer;
655 vring_packed_desc_t *id =
656 (vring_packed_desc_t *) vlib_buffer_get_current (indirect_desc);
660 d->addr = vlib_physmem_get_pa (vm, id);
661 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
664 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
665 * should be presented in separate descriptor and data will start
666 * from next descriptor.
669 id->len = b->current_length + hdr_sz;
677 id->addr = vlib_buffer_get_current_pa (vm, b);
678 id->len = b->current_length;
680 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
686 b = vlib_get_buffer (vm, b->next_buffer);
687 id->addr = vlib_buffer_get_current_pa (vm, b);
688 id->len = b->current_length;
689 if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
691 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
692 vlib_error_count (vm, node->node_index,
693 VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
700 d->len = count * sizeof (vring_packed_desc_t);
701 flags = VRING_DESC_F_INDIRECT;
707 if (vring->avail_wrap_counter)
709 flags |= VRING_DESC_F_AVAIL;
710 flags &= ~VRING_DESC_F_USED;
714 flags &= ~VRING_DESC_F_AVAIL;
715 flags |= VRING_DESC_F_USED;
720 vring->buffers[next] = bi;
724 if (drop_inline != ~0)
725 virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
732 virtio_interface_tx_packed_gso_inline (vlib_main_t *vm,
733 vlib_node_runtime_t *node,
734 virtio_if_t *vif, virtio_if_type_t type,
735 virtio_vring_t *vring, u32 *buffers,
736 u16 n_left, const int do_gso,
737 const int csum_offload)
739 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
740 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
742 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
744 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
745 const int hdr_sz = vif->virtio_net_hdr_sz;
746 u16 sz = vring->size;
747 u16 used, next, n_buffers = 0, n_buffers_left = 0;
748 u16 n_vectors = n_left;
751 used = vring->desc_in_use;
752 next = vring->desc_next;
754 if (vif->packet_buffering)
756 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
758 while (n_buffers_left && used < sz)
762 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
765 n_added = add_buffer_to_slot_packed (
766 vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
767 is_pci, is_tun, is_indirect, is_any_layout);
769 if (PREDICT_FALSE (n_added == 0))
777 vring->avail_wrap_counter ^= 1;
782 while (n_left && used < sz)
786 n_added = add_buffer_to_slot_packed (
787 vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
788 is_pci, is_tun, is_indirect, is_any_layout);
791 if (PREDICT_FALSE (n_added == 0))
799 vring->avail_wrap_counter ^= 1;
803 if (n_left != n_vectors || n_buffers != n_buffers_left)
805 CLIB_MEMORY_STORE_BARRIER ();
806 vring->desc_next = next;
807 vring->desc_in_use = used;
808 CLIB_MEMORY_BARRIER ();
809 if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
810 virtio_kick (vm, vring, vif);
817 virtio_find_free_desc (virtio_vring_t *vring, u16 size, u16 mask, u16 req,
818 u16 next, u32 *first_free_desc_index,
819 u16 *free_desc_count)
822 /* next is used as hint: from where to start looking */
823 for (u16 i = 0; i < size; i++, next++)
825 if (vring->buffers[next & mask] == ~0)
827 if (*first_free_desc_index == ~0)
829 *first_free_desc_index = (next & mask);
831 (*free_desc_count)++;
838 if (start + *free_desc_count == i)
840 (*free_desc_count)++;
853 virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
854 vlib_node_runtime_t *node,
855 virtio_if_t *vif, virtio_if_type_t type,
856 virtio_vring_t *vring, u32 *buffers,
857 u16 n_left, int do_gso, int csum_offload)
859 u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
860 int is_pci = (type == VIRTIO_IF_TYPE_PCI);
861 int is_tun = (type == VIRTIO_IF_TYPE_TUN);
863 ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
865 ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
866 u16 sz = vring->size;
867 int hdr_sz = vif->virtio_net_hdr_sz;
869 u16 n_vectors = n_left;
871 used = vring->desc_in_use;
872 next = vring->desc_next;
873 avail = vring->avail->idx;
875 u16 free_desc_count = 0;
877 if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
879 u32 first_free_desc_index = ~0;
881 virtio_find_free_desc (vring, sz, mask, n_left, next,
882 &first_free_desc_index, &free_desc_count);
885 next = first_free_desc_index;
888 free_desc_count = sz - used;
890 if (vif->packet_buffering)
892 n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
894 while (n_buffers_left && free_desc_count)
898 u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
902 n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
903 free_desc_count, avail, next, mask,
904 hdr_sz, do_gso, csum_offload, is_pci,
905 is_tun, is_indirect, is_any_layout);
906 if (PREDICT_FALSE (n_added == 0))
911 else if (PREDICT_FALSE (n_added > free_desc_count))
915 next = (next + n_added) & mask;
918 free_desc_count -= n_added;
922 while (n_left && free_desc_count)
927 add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
928 avail, next, mask, hdr_sz, do_gso, csum_offload,
929 is_pci, is_tun, is_indirect, is_any_layout);
931 if (PREDICT_FALSE (n_added == 0))
937 else if (PREDICT_FALSE (n_added > free_desc_count))
941 next = (next + n_added) & mask;
945 free_desc_count -= n_added;
948 if (n_left != n_vectors || n_buffers != n_buffers_left)
950 clib_atomic_store_seq_cst (&vring->avail->idx, avail);
951 vring->desc_next = next;
952 vring->desc_in_use = used;
953 if ((clib_atomic_load_seq_cst (&vring->used->flags) &
954 VRING_USED_F_NO_NOTIFY) == 0)
955 virtio_kick (vm, vring, vif);
962 virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
963 virtio_if_t *vif, virtio_if_type_t type,
964 virtio_vring_t *vring, u32 *buffers,
965 u16 n_left, int packed, int do_gso,
969 return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
971 do_gso, csum_offload);
973 return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
975 do_gso, csum_offload);
979 virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
980 virtio_if_t *vif, virtio_vring_t *vring,
981 virtio_if_type_t type, u32 *buffers, u16 n_left,
984 vnet_main_t *vnm = vnet_get_main ();
985 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
987 if (hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO)
988 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
989 buffers, n_left, packed,
991 1 /* checksum offload */ );
992 else if (hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM)
993 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
994 buffers, n_left, packed,
996 1 /* checksum offload */ );
998 return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
999 buffers, n_left, packed,
1001 0 /* no checksum offload */ );
1004 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1005 vlib_node_runtime_t * node,
1006 vlib_frame_t * frame)
1008 virtio_main_t *nm = &virtio_main;
1009 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1010 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1011 u16 qid = vm->thread_index % vif->num_txqs;
1012 virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1013 u16 n_left = frame->n_vectors;
1014 u32 *buffers = vlib_frame_vector_args (frame);
1015 u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1016 int packed = vif->is_packed;
1017 u16 n_vectors = frame->n_vectors;
1019 clib_spinlock_lock_if_init (&vring->lockp);
1021 if (vif->packet_coalesce)
1023 n_vectors = n_left =
1024 vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1028 u16 retry_count = 2;
1031 /* free consumed buffers */
1032 virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1034 if (vif->type == VIRTIO_IF_TYPE_TAP)
1035 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1037 &buffers[n_vectors - n_left],
1039 else if (vif->type == VIRTIO_IF_TYPE_PCI)
1040 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1042 &buffers[n_vectors - n_left],
1044 else if (vif->type == VIRTIO_IF_TYPE_TUN)
1045 n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1047 &buffers[n_vectors - n_left],
1052 if (n_left && retry_count--)
1055 if (vif->packet_buffering && n_left)
1057 u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1062 n_left -= n_buffered;
1065 virtio_interface_drop_inline (vm, vif, node->node_index,
1066 &buffers[n_vectors - n_left], n_left,
1067 VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1069 clib_spinlock_unlock_if_init (&vring->lockp);
1071 return frame->n_vectors - n_left;
1075 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1078 virtio_main_t *apm = &virtio_main;
1079 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1080 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1082 /* Shut off redirection */
1083 if (node_index == ~0)
1085 vif->per_interface_next_index = node_index;
1089 vif->per_interface_next_index =
1090 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1095 virtio_clear_hw_interface_counters (u32 instance)
1097 /* Nothing for now */
1101 virtio_set_rx_interrupt (virtio_if_t *vif, virtio_vring_t *vring)
1104 vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1106 vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1110 virtio_set_rx_polling (virtio_if_t *vif, virtio_vring_t *vring)
1113 vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1115 vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1118 static clib_error_t *
1119 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1120 vnet_hw_if_rx_mode mode)
1122 vlib_main_t *vm = vnm->vlib_main;
1123 virtio_main_t *mm = &virtio_main;
1124 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1125 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1126 virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1128 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1130 virtio_set_rx_polling (vif, rx_vring);
1131 return clib_error_return (0, "interrupt mode is not supported");
1134 if (mode == VNET_HW_IF_RX_MODE_POLLING)
1136 if (vif->packet_coalesce || vif->packet_buffering)
1138 if (mm->interrupt_queues_count > 0)
1139 mm->interrupt_queues_count--;
1140 if (mm->interrupt_queues_count == 0)
1141 vlib_process_signal_event (vm,
1142 virtio_send_interrupt_node.index,
1143 VIRTIO_EVENT_STOP_TIMER, 0);
1145 virtio_set_rx_polling (vif, rx_vring);
1149 if (vif->packet_coalesce || vif->packet_buffering)
1151 mm->interrupt_queues_count++;
1152 if (mm->interrupt_queues_count == 1)
1153 vlib_process_signal_event (vm,
1154 virtio_send_interrupt_node.index,
1155 VIRTIO_EVENT_START_TIMER, 0);
1157 virtio_set_rx_interrupt (vif, rx_vring);
1160 rx_vring->mode = mode;
1165 static clib_error_t *
1166 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1168 virtio_main_t *mm = &virtio_main;
1169 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1170 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1172 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1174 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1175 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1176 VNET_HW_INTERFACE_FLAG_LINK_UP);
1180 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1181 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1186 static clib_error_t *
1187 virtio_subif_add_del_function (vnet_main_t * vnm,
1189 struct vnet_sw_interface_t *st, int is_add)
1191 /* Nothing for now */
1196 VNET_DEVICE_CLASS (virtio_device_class) = {
1198 .format_device_name = format_virtio_device_name,
1199 .format_device = format_virtio_device,
1200 .format_tx_trace = format_virtio_tx_trace,
1201 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1202 .tx_function_error_strings = virtio_tx_func_error_strings,
1203 .rx_redirect_to_node = virtio_set_interface_next_node,
1204 .clear_counters = virtio_clear_hw_interface_counters,
1205 .admin_up_down_function = virtio_interface_admin_up_down,
1206 .subif_add_del_function = virtio_subif_add_del_function,
1207 .rx_mode_change_function = virtio_interface_rx_mode_change,
1213 * fd.io coding-style-patch-verification: ON
1216 * eval: (c-set-style "gnu")