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/devices/virtio/virtio.h>
35 #include <vnet/devices/virtio/virtio_inline.h>
37 static char *virtio_input_error_strings[] = {
39 foreach_virtio_input_error
49 virtio_net_hdr_v1_t hdr;
50 } virtio_input_trace_t;
53 format_virtio_input_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 virtio_input_trace_t *t = va_arg (*args, virtio_input_trace_t *);
58 u32 indent = format_get_indent (s);
60 s = format (s, "virtio: hw_if_index %d next-index %d vring %u len %u",
61 t->hw_if_index, t->next_index, t->ring, t->len);
62 s = format (s, "\n%Uhdr: flags 0x%02x gso_type 0x%02x hdr_len %u "
63 "gso_size %u csum_start %u csum_offset %u num_buffers %u",
64 format_white_space, indent + 2,
65 t->hdr.flags, t->hdr.gso_type, t->hdr.hdr_len, t->hdr.gso_size,
66 t->hdr.csum_start, t->hdr.csum_offset, t->hdr.num_buffers);
70 static_always_inline void
71 virtio_needs_csum (vlib_buffer_t * b0, virtio_net_hdr_v1_t * hdr,
72 u8 * l4_proto, u8 * l4_hdr_sz, virtio_if_type_t type)
74 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
76 u16 ethertype = 0, l2hdr_sz = 0;
77 vnet_buffer_oflags_t oflags = 0;
79 if (type == VIRTIO_IF_TYPE_TUN)
81 switch (b0->data[0] & 0xf0)
84 ethertype = ETHERNET_TYPE_IP4;
87 ethertype = ETHERNET_TYPE_IP6;
93 ethernet_header_t *eh =
94 (ethernet_header_t *) vlib_buffer_get_current (b0);
95 ethertype = clib_net_to_host_u16 (eh->type);
96 l2hdr_sz = sizeof (ethernet_header_t);
98 if (ethernet_frame_is_tagged (ethertype))
100 ethernet_vlan_header_t *vlan =
101 (ethernet_vlan_header_t *) (eh + 1);
103 ethertype = clib_net_to_host_u16 (vlan->type);
104 l2hdr_sz += sizeof (*vlan);
105 if (ethertype == ETHERNET_TYPE_VLAN)
108 ethertype = clib_net_to_host_u16 (vlan->type);
109 l2hdr_sz += sizeof (*vlan);
114 vnet_buffer (b0)->l2_hdr_offset = 0;
115 vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
117 if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
120 (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
121 vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4);
122 *l4_proto = ip4->protocol;
123 oflags |= VNET_BUFFER_OFFLOAD_F_IP_CKSUM;
125 (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
126 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
127 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
129 else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
132 (ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz);
133 vnet_buffer (b0)->l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t);
134 /* FIXME IPv6 EH traversal */
135 *l4_proto = ip6->protocol;
136 b0->flags |= (VNET_BUFFER_F_IS_IP6 |
137 VNET_BUFFER_F_L2_HDR_OFFSET_VALID
138 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
139 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
141 if (*l4_proto == IP_PROTOCOL_TCP)
143 oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
144 tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
146 (b0)->l4_hdr_offset);
147 *l4_hdr_sz = tcp_header_bytes (tcp);
149 else if (*l4_proto == IP_PROTOCOL_UDP)
151 oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
152 udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) +
154 (b0)->l4_hdr_offset);
155 *l4_hdr_sz = sizeof (*udp);
158 vnet_buffer_offload_flags_set (b0, oflags);
162 static_always_inline void
163 fill_gso_buffer_flags (vlib_buffer_t * b0, virtio_net_hdr_v1_t * hdr,
164 u8 l4_proto, u8 l4_hdr_sz)
166 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
168 ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
169 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
170 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
171 b0->flags |= VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4;
173 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
175 ASSERT (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM);
176 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
177 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
178 b0->flags |= VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6;
182 static_always_inline u16
183 virtio_n_left_to_process (virtio_vring_t * vring, const int packed)
186 return vring->desc_in_use;
188 return vring->used->idx - vring->last_used_idx;
191 static_always_inline u16
192 virtio_get_slot_id (virtio_vring_t * vring, const int packed, u16 last,
196 return vring->packed_desc[last].id;
198 return vring->used->ring[last & mask].id;
201 static_always_inline u16
202 virtio_get_len (virtio_vring_t * vring, const int packed, const int hdr_sz,
206 return vring->packed_desc[last].len - hdr_sz;
208 return vring->used->ring[last & mask].len - hdr_sz;
211 #define increment_last(last, packed, vring) \
214 if (packed && last >= vring->size) \
217 vring->used_wrap_counter ^= 1; \
221 static_always_inline uword
222 virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
223 vlib_frame_t * frame, virtio_if_t * vif,
224 virtio_vring_t * vring, virtio_if_type_t type,
225 int gso_enabled, int checksum_offload_enabled,
228 vnet_main_t *vnm = vnet_get_main ();
229 u32 thread_index = vm->thread_index;
230 uword n_trace = vlib_get_trace_count (vm, node);
232 const int hdr_sz = vif->virtio_net_hdr_sz;
234 u32 n_rx_packets = 0;
236 u16 mask = vring->size - 1;
237 u16 last = vring->last_used_idx;
238 u16 n_left = virtio_n_left_to_process (vring, packed);
239 vlib_buffer_t bt = {};
244 if (type == VIRTIO_IF_TYPE_TUN)
246 next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
250 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
251 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
252 next_index = vif->per_interface_next_index;
254 /* only for l2, redirect if feature path enabled */
255 vnet_feature_start_device_input_x1 (vif->sw_if_index, &next_index, &bt);
261 u32 next0 = next_index;
263 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
265 while (n_left && n_left_to_next)
269 vring_packed_desc_t *d = &vring->packed_desc[last];
270 u16 flags = d->flags;
271 if ((flags & VRING_DESC_F_AVAIL) !=
272 (vring->used_wrap_counter << 7)
273 || (flags & VRING_DESC_F_USED) !=
274 (vring->used_wrap_counter << 15))
280 u8 l4_proto = 0, l4_hdr_sz = 0;
282 virtio_net_hdr_v1_t *hdr;
283 u16 slot = virtio_get_slot_id (vring, packed, last, mask);
284 u16 len = virtio_get_len (vring, packed, hdr_sz, last, mask);
285 u32 bi0 = vring->buffers[slot];
286 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
287 hdr = vlib_buffer_get_current (b0);
288 if (hdr_sz == sizeof (virtio_net_hdr_v1_t))
289 num_buffers = hdr->num_buffers;
291 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
292 b0->current_data = 0;
293 b0->current_length = len;
295 if (checksum_offload_enabled)
296 virtio_needs_csum (b0, hdr, &l4_proto, &l4_hdr_sz, type);
299 fill_gso_buffer_flags (b0, hdr, l4_proto, l4_hdr_sz);
301 vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
302 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
304 /* if multisegment packet */
305 if (PREDICT_FALSE (num_buffers > 1))
307 vlib_buffer_t *pb, *cb;
309 b0->total_length_not_including_first_buffer = 0;
310 while (num_buffers > 1)
312 increment_last (last, packed, vring);
313 u16 cslot = virtio_get_slot_id (vring, packed, last, mask);
314 /* hdr size is 0 after 1st packet in chain buffers */
315 u16 clen = virtio_get_len (vring, packed, 0, last, mask);
316 u32 cbi = vring->buffers[cslot];
317 cb = vlib_get_buffer (vm, cbi);
320 cb->current_length = clen;
322 /* previous buffer */
323 pb->next_buffer = cbi;
324 pb->flags |= VLIB_BUFFER_NEXT_PRESENT;
327 b0->total_length_not_including_first_buffer += clen;
330 vring->desc_in_use--;
334 len += b0->total_length_not_including_first_buffer;
337 if (type == VIRTIO_IF_TYPE_TUN)
339 switch (b0->data[0] & 0xf0)
342 next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
345 next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
348 next0 = VNET_DEVICE_INPUT_NEXT_DROP;
352 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
353 next0 = vif->per_interface_next_index;
357 /* copy feature arc data from template */
358 b0->current_config_index = bt.current_config_index;
359 vnet_buffer (b0)->feature_arc_index =
360 vnet_buffer (&bt)->feature_arc_index;
364 if (PREDICT_FALSE (n_trace > 0 && vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */
367 virtio_input_trace_t *tr;
368 vlib_set_trace_count (vm, node, --n_trace);
369 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
370 tr->next_index = next0;
371 tr->hw_if_index = vif->hw_if_index;
373 clib_memcpy_fast (&tr->hdr, hdr, (hdr_sz == 12) ? 12 : 10);
378 vring->desc_in_use--;
382 increment_last (last, packed, vring);
384 /* only tun interfaces may have different next index */
385 if (type == VIRTIO_IF_TYPE_TUN)
386 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
387 n_left_to_next, bi0, next0);
393 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
395 vring->last_used_idx = last;
397 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
398 + VNET_INTERFACE_COUNTER_RX, thread_index,
399 vif->sw_if_index, n_rx_packets,
405 static_always_inline uword
406 virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
407 vlib_frame_t * frame, virtio_if_t * vif, u16 qid,
408 virtio_if_type_t type)
410 virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, qid);
411 const int hdr_sz = vif->virtio_net_hdr_sz;
416 if (vif->gso_enabled)
418 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
420 else if (vif->csum_offload_enabled)
422 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
426 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
429 virtio_refill_vring_packed (vm, vif, type, vring, hdr_sz,
434 if (vif->gso_enabled)
436 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
438 else if (vif->csum_offload_enabled)
440 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
444 virtio_device_input_gso_inline (vm, node, frame, vif, vring, type,
447 virtio_refill_vring_split (vm, vif, type, vring, hdr_sz,
453 VLIB_NODE_FN (virtio_input_node) (vlib_main_t * vm,
454 vlib_node_runtime_t * node,
455 vlib_frame_t * frame)
458 virtio_main_t *vim = &virtio_main;
459 vnet_hw_if_rxq_poll_vector_t *p,
460 *pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
465 vif = vec_elt_at_index (vim->interfaces, p->dev_instance);
466 if (vif->flags & VIRTIO_IF_FLAG_ADMIN_UP)
468 if (vif->type == VIRTIO_IF_TYPE_TAP)
469 n_rx += virtio_device_input_inline (
470 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_TAP);
471 else if (vif->type == VIRTIO_IF_TYPE_PCI)
472 n_rx += virtio_device_input_inline (
473 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_PCI);
474 else if (vif->type == VIRTIO_IF_TYPE_TUN)
475 n_rx += virtio_device_input_inline (
476 vm, node, frame, vif, p->queue_id, VIRTIO_IF_TYPE_TUN);
484 VLIB_REGISTER_NODE (virtio_input_node) = {
485 .name = "virtio-input",
486 .sibling_of = "device-input",
487 .format_trace = format_virtio_input_trace,
488 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
489 .type = VLIB_NODE_TYPE_INPUT,
490 .state = VLIB_NODE_STATE_INTERRUPT,
491 .n_errors = VIRTIO_INPUT_N_ERROR,
492 .error_strings = virtio_input_error_strings,
497 * fd.io coding-style-patch-verification: ON
500 * eval: (c-set-style "gnu")