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 <linux/virtio_net.h>
25 #include <linux/vhost.h>
26 #include <sys/eventfd.h>
28 #include <vlib/vlib.h>
29 #include <vlib/unix/unix.h>
30 #include <vnet/ethernet/ethernet.h>
31 #include <vnet/devices/devices.h>
32 #include <vnet/feature/feature.h>
33 #include <vnet/ip/ip4_packet.h>
34 #include <vnet/ip/ip6_packet.h>
35 #include <vnet/devices/virtio/virtio.h>
38 #define foreach_virtio_input_error \
43 #define _(f,s) TAP_INPUT_ERROR_##f,
44 foreach_virtio_input_error
47 } virtio_input_error_t;
49 static char *virtio_input_error_strings[] = {
51 foreach_virtio_input_error
61 struct virtio_net_hdr_v1 hdr;
62 } virtio_input_trace_t;
65 format_virtio_input_trace (u8 * s, va_list * args)
67 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
68 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
69 virtio_input_trace_t *t = va_arg (*args, virtio_input_trace_t *);
70 u32 indent = format_get_indent (s);
72 s = format (s, "virtio: hw_if_index %d next-index %d vring %u len %u",
73 t->hw_if_index, t->next_index, t->ring, t->len);
74 s = format (s, "\n%Uhdr: flags 0x%02x gso_type 0x%02x hdr_len %u "
75 "gso_size %u csum_start %u csum_offset %u num_buffers %u",
76 format_white_space, indent + 2,
77 t->hdr.flags, t->hdr.gso_type, t->hdr.hdr_len, t->hdr.gso_size,
78 t->hdr.csum_start, t->hdr.csum_offset, t->hdr.num_buffers);
82 static_always_inline void
83 virtio_refill_vring (vlib_main_t * vm, virtio_vring_t * vring)
85 const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
86 u16 used, next, avail, n_slots;
90 used = vring->desc_in_use;
92 if (sz - used < sz / 8)
96 next = vring->desc_next;
97 avail = vring->avail->idx;
98 n_slots = vlib_buffer_alloc_to_ring (vm, vring->buffers, next, vring->size,
103 struct vring_desc *d = &vring->desc[next];;
104 vlib_buffer_t *b = vlib_get_buffer (vm, vring->buffers[next]);
105 d->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
106 d->len = VLIB_BUFFER_DATA_SIZE + hdr_sz;
107 d->flags = VRING_DESC_F_WRITE;
108 vring->avail->ring[avail & mask] = next;
110 next = (next + 1) & mask;
114 CLIB_MEMORY_STORE_BARRIER ();
115 vring->avail->idx = avail;
116 vring->desc_next = next;
117 vring->desc_in_use = used;
119 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
122 CLIB_UNUSED (int r) = write (vring->kick_fd, &b, sizeof (b));
126 static_always_inline uword
127 virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
128 vlib_frame_t * frame, virtio_if_t * vif, u16 qid)
130 vnet_main_t *vnm = vnet_get_main ();
131 u32 thread_index = vlib_get_thread_index ();
132 uword n_trace = vlib_get_trace_count (vm, node);
133 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, 0);
134 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
135 const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
137 u32 n_rx_packets = 0;
139 u16 mask = vring->size - 1;
140 u16 last = vring->last_used_idx;
141 u16 n_left = vring->used->idx - last;
149 u32 next0 = next_index;
150 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
152 while (n_left && n_left_to_next)
155 struct vring_used_elem *e = &vring->used->ring[last & mask];
156 struct virtio_net_hdr_v1 *hdr;
158 u16 len = e->len - hdr_sz;
159 u32 bi0 = vring->buffers[slot];
160 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
161 hdr = vlib_buffer_get_current (b0) - hdr_sz;
162 num_buffers = hdr->num_buffers;
164 b0->current_data = 0;
165 b0->current_length = len;
166 b0->total_length_not_including_first_buffer = 0;
167 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
168 vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
169 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
171 /* if multisegment packet */
172 if (PREDICT_FALSE (num_buffers > 1))
174 vlib_buffer_t *pb, *cb;
176 while (num_buffers > 1)
179 e = &vring->used->ring[last & mask];
180 u32 cbi = vring->buffers[e->id];
181 cb = vlib_get_buffer (vm, cbi);
184 cb->current_data = -hdr_sz;
185 cb->current_length = e->len;
187 /* previous buffer */
188 pb->next_buffer = cbi;
189 pb->flags |= VLIB_BUFFER_NEXT_PRESENT;
192 b0->total_length_not_including_first_buffer += e->len;
195 vring->desc_in_use--;
201 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
202 next0 = vif->per_interface_next_index;
204 /* redirect if feature path enabled */
205 vnet_feature_start_device_input_x1 (vif->sw_if_index, &next0, b0);
207 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
209 if (PREDICT_FALSE (n_trace > 0))
211 virtio_input_trace_t *tr;
212 vlib_trace_buffer (vm, node, next0, b0,
213 /* follow_chain */ 0);
214 vlib_set_trace_count (vm, node, --n_trace);
215 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
216 tr->next_index = next0;
217 tr->hw_if_index = vif->hw_if_index;
219 clib_memcpy (&tr->hdr, hdr, hdr_sz);
224 vring->desc_in_use--;
231 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
232 n_left_to_next, bi0, next0);
238 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
240 vring->last_used_idx = last;
242 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
243 + VNET_INTERFACE_COUNTER_RX, thread_index,
244 vif->hw_if_index, n_rx_packets,
248 virtio_refill_vring (vm, vring);
254 virtio_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
255 vlib_frame_t * frame)
258 virtio_main_t *nm = &virtio_main;
259 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
260 vnet_device_and_queue_t *dq;
262 foreach_device_and_queue (dq, rt->devices_and_queues)
265 mif = vec_elt_at_index (nm->interfaces, dq->dev_instance);
266 if (mif->flags & VIRTIO_IF_FLAG_ADMIN_UP)
268 n_rx += virtio_device_input_inline (vm, node, frame, mif,
277 VLIB_REGISTER_NODE (virtio_input_node) = {
278 .function = virtio_input_fn,
279 .name = "virtio-input",
280 .sibling_of = "device-input",
281 .format_trace = format_virtio_input_trace,
282 .type = VLIB_NODE_TYPE_INPUT,
283 .state = VLIB_NODE_STATE_INTERRUPT,
284 .n_errors = TAP_INPUT_N_ERROR,
285 .error_strings = virtio_input_error_strings,
288 VLIB_NODE_FUNCTION_MULTIARCH (virtio_input_node, virtio_input_fn)
292 * fd.io coding-style-patch-verification: ON
295 * eval: (c-set-style "gnu")