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/devices/virtio/virtio.h>
36 #define foreach_virtio_input_error \
41 #define _(f,s) TAP_INPUT_ERROR_##f,
42 foreach_virtio_input_error
45 } virtio_input_error_t;
47 static char *virtio_input_error_strings[] = {
49 foreach_virtio_input_error
59 struct virtio_net_hdr_v1 hdr;
60 } virtio_input_trace_t;
63 format_virtio_input_trace (u8 * s, va_list * args)
65 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
66 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
67 virtio_input_trace_t *t = va_arg (*args, virtio_input_trace_t *);
68 u32 indent = format_get_indent (s);
70 s = format (s, "virtio: hw_if_index %d next-index %d vring %u len %u",
71 t->hw_if_index, t->next_index, t->ring, t->len);
72 s = format (s, "\n%Uhdr: flags 0x%02x gso_type 0x%02x hdr_len %u "
73 "gso_size %u csum_start %u csum_offset %u num_buffers %u",
74 format_white_space, indent + 2,
75 t->hdr.flags, t->hdr.gso_type, t->hdr.hdr_len, t->hdr.gso_size,
76 t->hdr.csum_start, t->hdr.csum_offset, t->hdr.num_buffers);
80 static_always_inline void
81 virtio_refill_vring (vlib_main_t * vm, virtio_vring_t * vring)
83 const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
84 u16 used, next, avail, n_slots, n_alloc;
89 used = vring->desc_in_use;
91 if (sz - used < sz / 8)
95 next = vring->desc_next;
96 avail = vring->avail->idx;
97 n_alloc = vlib_buffer_alloc (vm, &vring->buffers[next], n_slots);
99 if (PREDICT_FALSE (n_alloc < n_slots))
102 i = next + n_slots - sz;
103 if (PREDICT_FALSE (i > 0))
104 clib_memcpy (vring->buffers, &vring->buffers[sz], i * sizeof (u32));
108 struct vring_desc *d = &vring->desc[next];;
109 vlib_buffer_t *b = vlib_get_buffer (vm, vring->buffers[next]);
110 d->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
111 d->len = VLIB_BUFFER_DATA_SIZE + hdr_sz;
112 d->flags = VRING_DESC_F_WRITE;
113 vring->avail->ring[avail & mask] = next;
115 next = (next + 1) & mask;
119 CLIB_MEMORY_STORE_BARRIER ();
120 vring->avail->idx = avail;
121 vring->desc_next = next;
122 vring->desc_in_use = used;
124 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
127 CLIB_UNUSED (int r) = write (vring->kick_fd, &b, sizeof (b));
131 static_always_inline uword
132 virtio_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
133 vlib_frame_t * frame, virtio_if_t * vif, u16 qid)
135 vnet_main_t *vnm = vnet_get_main ();
136 u32 thread_index = vlib_get_thread_index ();
137 uword n_trace = vlib_get_trace_count (vm, node);
138 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, 0);
139 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
140 const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
142 u32 n_rx_packets = 0;
144 u16 mask = vring->size - 1;
145 u16 last = vring->last_used_idx;
146 u16 n_left = vring->used->idx - last;
154 u32 next0 = next_index;
155 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
157 while (n_left && n_left_to_next)
160 struct vring_used_elem *e = &vring->used->ring[last & mask];
161 struct virtio_net_hdr_v1 *hdr;
163 u16 len = e->len - hdr_sz;
164 u32 bi0 = vring->buffers[slot];
165 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
166 hdr = vlib_buffer_get_current (b0) - hdr_sz;
167 num_buffers = hdr->num_buffers;
169 b0->current_data = 0;
170 b0->current_length = len;
171 b0->total_length_not_including_first_buffer = 0;
172 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
173 vnet_buffer (b0)->sw_if_index[VLIB_RX] = vif->sw_if_index;
174 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
176 /* if multisegment packet */
177 if (PREDICT_FALSE (num_buffers > 1))
179 vlib_buffer_t *pb, *cb;
181 while (num_buffers > 1)
184 e = &vring->used->ring[last & mask];
185 u32 cbi = vring->buffers[e->id];
186 cb = vlib_get_buffer (vm, cbi);
189 cb->current_data = -hdr_sz;
190 cb->current_length = e->len;
192 /* previous buffer */
193 pb->next_buffer = cbi;
194 pb->flags |= VLIB_BUFFER_NEXT_PRESENT;
197 b0->total_length_not_including_first_buffer += e->len;
200 vring->desc_in_use--;
206 if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
207 next0 = vif->per_interface_next_index;
209 /* redirect if feature path enabled */
210 vnet_feature_start_device_input_x1 (vif->sw_if_index, &next0, b0);
212 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
214 if (PREDICT_FALSE (n_trace > 0))
216 virtio_input_trace_t *tr;
217 vlib_trace_buffer (vm, node, next0, b0,
218 /* follow_chain */ 0);
219 vlib_set_trace_count (vm, node, --n_trace);
220 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
221 tr->next_index = next0;
222 tr->hw_if_index = vif->hw_if_index;
224 clib_memcpy (&tr->hdr, hdr, hdr_sz);
229 vring->desc_in_use--;
236 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
237 n_left_to_next, bi0, next0);
243 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
245 vring->last_used_idx = last;
247 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
248 + VNET_INTERFACE_COUNTER_RX, thread_index,
249 vif->hw_if_index, n_rx_packets,
253 virtio_refill_vring (vm, vring);
259 virtio_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
260 vlib_frame_t * frame)
263 virtio_main_t *nm = &virtio_main;
264 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
265 vnet_device_and_queue_t *dq;
267 foreach_device_and_queue (dq, rt->devices_and_queues)
270 mif = vec_elt_at_index (nm->interfaces, dq->dev_instance);
271 if (mif->flags & VIRTIO_IF_FLAG_ADMIN_UP)
273 n_rx += virtio_device_input_inline (vm, node, frame, mif,
282 VLIB_REGISTER_NODE (virtio_input_node) = {
283 .function = virtio_input_fn,
284 .name = "virtio-input",
285 .sibling_of = "device-input",
286 .format_trace = format_virtio_input_trace,
287 .type = VLIB_NODE_TYPE_INPUT,
288 .state = VLIB_NODE_STATE_INTERRUPT,
289 .n_errors = TAP_INPUT_N_ERROR,
290 .error_strings = virtio_input_error_strings,
293 VLIB_NODE_FUNCTION_MULTIARCH (virtio_input_node, virtio_input_fn)
297 * fd.io coding-style-patch-verification: ON
300 * eval: (c-set-style "gnu")