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 <linux/if_tun.h>
23 #include <sys/ioctl.h>
24 #include <sys/eventfd.h>
26 #include <vlib/vlib.h>
27 #include <vlib/unix/unix.h>
28 #include <vnet/ethernet/ethernet.h>
29 #include <vnet/feature/feature.h>
30 #include <vnet/interface/rx_queue_funcs.h>
31 #include <vnet/ip/ip4_packet.h>
32 #include <vnet/ip/ip6_packet.h>
33 #include <vnet/udp/udp_packet.h>
34 #include <vnet/tcp/tcp_packet.h>
35 #include <vnet/devices/virtio/virtio.h>
36 #include <vnet/devices/virtio/virtio_inline.h>
38 static char *virtio_input_error_strings[] = {
40 foreach_virtio_input_error
50 vnet_virtio_net_hdr_v1_t hdr;
51 } virtio_input_trace_t;
54 format_virtio_input_trace (u8 * s, va_list * args)
56 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
57 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
58 virtio_input_trace_t *t = va_arg (*args, virtio_input_trace_t *);
59 u32 indent = format_get_indent (s);
61 s = format (s, "virtio: hw_if_index %d next-index %d vring %u len %u",
62 t->hw_if_index, t->next_index, t->ring, t->len);
63 s = format (s, "\n%Uhdr: flags 0x%02x gso_type 0x%02x hdr_len %u "
64 "gso_size %u csum_start %u csum_offset %u num_buffers %u",
65 format_white_space, indent + 2,
66 t->hdr.flags, t->hdr.gso_type, t->hdr.hdr_len, t->hdr.gso_size,
67 t->hdr.csum_start, t->hdr.csum_offset, t->hdr.num_buffers);
71 static_always_inline void
72 virtio_needs_csum (vlib_buffer_t *b0, vnet_virtio_net_hdr_v1_t *hdr,
73 u8 *l4_proto, u8 *l4_hdr_sz, virtio_if_type_t type)
75 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
77 u16 ethertype = 0, l2hdr_sz = 0;
78 vnet_buffer_oflags_t oflags = 0;
80 if (type == VIRTIO_IF_TYPE_TUN)
82 switch (b0->data[0] & 0xf0)
85 ethertype = ETHERNET_TYPE_IP4;
88 ethertype = ETHERNET_TYPE_IP6;
94 ethernet_header_t *eh =
95 (ethernet_header_t *) vlib_buffer_get_current (b0);
96 ethertype = clib_net_to_host_u16 (eh->type);
97 l2hdr_sz = sizeof (ethernet_header_t);
99 if (ethernet_frame_is_tagged (ethertype))
101 ethernet_vlan_header_t *vlan =
102 (ethernet_vlan_header_t *) (eh + 1);
104 ethertype = clib_net_to_host_u16 (vlan->type);
105 l2hdr_sz += sizeof (*vlan);
106 if (ethertype == ETHERNET_TYPE_VLAN)
109 ethertype = clib_net_to_host_u16 (vlan->type);
110 l2hdr_sz += sizeof (*vlan);
115 vnet_buffer (b0)->l2_hdr_offset = 0;
116 vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
118 if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
121 (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
122 vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
123 *l4_proto = ip4->protocol;
124 oflags |= VNET_BUFFER_OFFLOAD_F_IP_CKSUM;
126 (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
127 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
128 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
130 else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
133 (ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
134 vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
135 /* FIXME IPv6 EH traversal */
136 *l4_proto = ip6->protocol;
137 b0->flags |= (VNET_BUFFER_F_IS_IP6 |
138 VNET_BUFFER_F_L2_HDR_OFFSET_VALID
139 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
140 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
142 if (*l4_proto == IP_PROTOCOL_TCP)
144 oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
145 tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
147 (b0)->l4_hdr_offset);
148 *l4_hdr_sz = tcp_header_bytes (tcp);
150 else if (*l4_proto == IP_PROTOCOL_UDP)
152 oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
153 udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) +
155 (b0)->l4_hdr_offset);
156 *l4_hdr_sz = sizeof (*udp);
159 vnet_buffer_offload_flags_set (b0, oflags);
163 static_always_inline void
164 fill_gso_buffer_flags (vlib_buffer_t *b0, vnet_virtio_net_hdr_v1_t *hdr,
165 u8 l4_proto, u8 l4_hdr_sz)
167 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
169 ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
170 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
171 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
172 b0->flags |= VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4;
174 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
176 ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
177 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
178 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
179 b0->flags |= VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6;
183 static_always_inline u16
184 virtio_n_left_to_process (vnet_virtio_vring_t *vring, const int packed)
187 return vring->desc_in_use;
189 return vring->used->idx - vring->last_used_idx;
192 static_always_inline u16
193 virtio_get_slot_id (vnet_virtio_vring_t *vring, const int packed, u16 last,
197 return vring->packed_desc[last].id;
199 return vring->used->ring[last & mask].id;
202 static_always_inline u16
203 virtio_get_len (vnet_virtio_vring_t *vring, const int packed, const int hdr_sz,
207 return vring->packed_desc[last].len - hdr_sz;
209 return vring->used->ring[last & mask].len - hdr_sz;
212 #define increment_last(last, packed, vring) \
216 if (packed && last >= vring->queue_size) \
219 vring->used_wrap_counter ^= 1; \
224 static_always_inline uword
225 virtio_device_input_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
226 vlib_frame_t *frame, virtio_if_t *vif,
227 vnet_virtio_vring_t *vring,
228 virtio_if_type_t type, int gso_enabled,
229 int checksum_offload_enabled, int packed)
231 vnet_main_t *vnm = vnet_get_main ();
232 u32 thread_index = vm->thread_index;
233 uword n_trace = vlib_get_trace_count (vm, node);
235 const int hdr_sz = vif->virtio_net_hdr_sz;
237 u32 n_rx_packets = 0;
239 u16 mask = vring->queue_size - 1;
240 u16 last = vring->last_used_idx;
241 u16 n_left = virtio_n_left_to_process (vring, packed);
242 vlib_buffer_t bt = {};
247 if (type == VIRTIO_IF_TYPE_TUN)
249 next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
253 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
254 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
255 next_index = vif->per_interface_next_index;
257 /* only for l2, redirect if feature path enabled */
258 vnet_feature_start_device_input_x1 (vif->sw_if_index, &next_index, &bt);
264 u32 next0 = next_index;
266 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
268 while (n_left && n_left_to_next)
272 vnet_virtio_vring_packed_desc_t *d = &vring->packed_desc[last];
273 u16 flags = d->flags;
274 if ((flags & VRING_DESC_F_AVAIL) !=
275 (vring->used_wrap_counter << 7)
276 || (flags & VRING_DESC_F_USED) !=
277 (vring->used_wrap_counter << 15))
283 u8 l4_proto = 0, l4_hdr_sz = 0;
285 vnet_virtio_net_hdr_v1_t *hdr;
286 u16 slot = virtio_get_slot_id (vring, packed, last, mask);
287 u16 len = virtio_get_len (vring, packed, hdr_sz, last, mask);
288 u32 bi0 = vring->buffers[slot];
289 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
290 hdr = vlib_buffer_get_current (b0);
291 if (hdr_sz == sizeof (vnet_virtio_net_hdr_v1_t))
292 num_buffers = hdr->num_buffers;
294 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
295 b0->current_data = 0;
296 b0->current_length = len;
298 if (checksum_offload_enabled)
299 virtio_needs_csum (b0, hdr, &l4_proto, &l4_hdr_sz, type);
302 fill_gso_buffer_flags (b0, hdr, l4_proto, l4_hdr_sz);
304 vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
305 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
307 /* if multisegment packet */
308 if (PREDICT_FALSE (num_buffers > 1))
310 vlib_buffer_t *pb, *cb;
312 b0->total_length_not_including_first_buffer = 0;
313 while (num_buffers > 1)
315 increment_last (last, packed, vring);
316 u16 cslot = virtio_get_slot_id (vring, packed, last, mask);
317 /* hdr size is 0 after 1st packet in chain buffers */
318 u16 clen = virtio_get_len (vring, packed, 0, last, mask);
319 u32 cbi = vring->buffers[cslot];
320 cb = vlib_get_buffer (vm, cbi);
323 cb->current_length = clen;
325 /* previous buffer */
326 pb->next_buffer = cbi;
327 pb->flags |= VLIB_BUFFER_NEXT_PRESENT;
330 b0->total_length_not_including_first_buffer += clen;
333 vring->desc_in_use--;
337 len += b0->total_length_not_including_first_buffer;
340 if (type == VIRTIO_IF_TYPE_TUN)
342 switch (b0->data[0] & 0xf0)
345 next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
348 next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
351 next0 = VNET_DEVICE_INPUT_NEXT_DROP;
355 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
356 next0 = vif->per_interface_next_index;
360 /* copy feature arc data from template */
361 b0->current_config_index = bt.current_config_index;
362 vnet_buffer (b0)->feature_arc_index =
363 vnet_buffer (&bt)->feature_arc_index;
367 if (PREDICT_FALSE (n_trace > 0 && vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */
370 virtio_input_trace_t *tr;
371 vlib_set_trace_count (vm, node, --n_trace);
372 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
373 tr->next_index = next0;
374 tr->hw_if_index = vif->hw_if_index;
376 clib_memcpy_fast (&tr->hdr, hdr, (hdr_sz == 12) ? 12 : 10);
381 vring->desc_in_use--;
385 increment_last (last, packed, vring);
387 /* only tun interfaces may have different next index */
388 if (type == VIRTIO_IF_TYPE_TUN)
389 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
390 n_left_to_next, bi0, next0);
396 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
398 vring->last_used_idx = last;
400 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
401 + VNET_INTERFACE_COUNTER_RX, thread_index,
402 vif->sw_if_index, n_rx_packets,
408 static_always_inline uword
409 virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
410 vlib_frame_t * frame, virtio_if_t * vif, u16 qid,
411 virtio_if_type_t type)
413 vnet_virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, qid);
414 const int hdr_sz = vif->virtio_net_hdr_sz;
419 if (vif->gso_enabled)
421 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
423 else if (vif->csum_offload_enabled)
425 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
429 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
432 virtio_refill_vring_packed (vm, vif, type, vring, hdr_sz,
437 if (vif->gso_enabled)
439 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
441 else if (vif->csum_offload_enabled)
443 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
447 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
450 virtio_refill_vring_split (vm, vif, type, vring, hdr_sz,
456 VLIB_NODE_FN (virtio_input_node) (vlib_main_t * vm,
457 vlib_node_runtime_t * node,
458 vlib_frame_t * frame)
461 virtio_main_t *vim = &virtio_main;
462 vnet_hw_if_rxq_poll_vector_t *p,
463 *pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
468 vif = vec_elt_at_index (vim->interfaces, p->dev_instance);
469 if (vif->flags & VIRTIO_IF_FLAG_ADMIN_UP)
471 if (vif->type == VIRTIO_IF_TYPE_TAP)
472 n_rx += virtio_device_input_inline (
473 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_TAP);
474 else if (vif->type == VIRTIO_IF_TYPE_PCI)
475 n_rx += virtio_device_input_inline (
476 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_PCI);
477 else if (vif->type == VIRTIO_IF_TYPE_TUN)
478 n_rx += virtio_device_input_inline (
479 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_TUN);
487 VLIB_REGISTER_NODE (virtio_input_node) = {
488 .name = "virtio-input",
489 .sibling_of = "device-input",
490 .format_trace = format_virtio_input_trace,
491 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
492 .type = VLIB_NODE_TYPE_INPUT,
493 .state = VLIB_NODE_STATE_INTERRUPT,
494 .n_errors = VIRTIO_INPUT_N_ERROR,
495 .error_strings = virtio_input_error_strings,
500 * fd.io coding-style-patch-verification: ON
503 * eval: (c-set-style "gnu")