2 *------------------------------------------------------------------
3 * Copyright (c) 2017 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/pci/pci.h>
30 #include <vlib/unix/unix.h>
31 #include <vnet/ethernet/ethernet.h>
32 #include <vnet/ip/ip4_packet.h>
33 #include <vnet/ip/ip6_packet.h>
34 #include <vnet/devices/virtio/virtio.h>
35 #include <vnet/devices/virtio/pci.h>
37 virtio_main_t virtio_main;
39 #define _IOCTL(fd,a,...) \
40 if (ioctl (fd, a, __VA_ARGS__) < 0) \
42 err = clib_error_return_unix (0, "ioctl(" #a ")"); \
47 call_read_ready (clib_file_t * uf)
49 virtio_main_t *nm = &virtio_main;
50 vnet_main_t *vnm = vnet_get_main ();
51 u16 qid = uf->private_data & 0xFFFF;
53 vec_elt_at_index (nm->interfaces, uf->private_data >> 16);
56 CLIB_UNUSED (ssize_t size) = read (uf->file_descriptor, &b, sizeof (b));
58 vnet_device_input_set_interrupt_pending (vnm, vif->hw_if_index, qid);
65 virtio_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx, u16 sz)
67 clib_error_t *err = 0;
68 virtio_vring_t *vring;
69 struct vhost_vring_state state = { 0 };
70 struct vhost_vring_addr addr = { 0 };
71 struct vhost_vring_file file = { 0 };
72 clib_file_t t = { 0 };
76 return clib_error_return (0, "ring size must be power of 2");
79 return clib_error_return (0, "ring size must be 32768 or lower");
84 vec_validate_aligned (vif->vrings, idx, CLIB_CACHE_LINE_BYTES);
85 vring = vec_elt_at_index (vif->vrings, idx);
87 i = sizeof (struct vring_desc) * sz;
88 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
89 vring->desc = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
90 clib_memset (vring->desc, 0, i);
92 i = sizeof (struct vring_avail) + sz * sizeof (vring->avail->ring[0]);
93 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
94 vring->avail = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
95 clib_memset (vring->avail, 0, i);
96 // tell kernel that we don't need interrupt
97 vring->avail->flags = VIRTIO_RING_FLAG_MASK_INT;
99 i = sizeof (struct vring_used) + sz * sizeof (struct vring_used_elem);
100 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
101 vring->used = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
102 clib_memset (vring->used, 0, i);
104 ASSERT (vring->buffers == 0);
105 vec_validate_aligned (vring->buffers, sz, CLIB_CACHE_LINE_BYTES);
106 ASSERT (vring->indirect_buffers == 0);
107 vec_validate_aligned (vring->indirect_buffers, sz, CLIB_CACHE_LINE_BYTES);
115 vlib_buffer_alloc (vm, vring->indirect_buffers + n_alloc,
118 while (n_alloc != sz);
122 vring->call_fd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
123 vring->kick_fd = eventfd (0, EFD_CLOEXEC);
125 t.read_function = call_read_ready;
126 t.file_descriptor = vring->call_fd;
127 t.private_data = vif->dev_instance << 16 | idx;
128 t.description = format (0, "%U vring %u", format_virtio_device_name,
129 vif->dev_instance, idx);
130 vring->call_file_index = clib_file_add (&file_main, &t);
134 _IOCTL (vif->fd, VHOST_SET_VRING_NUM, &state);
138 addr.desc_user_addr = pointer_to_uword (vring->desc);
139 addr.avail_user_addr = pointer_to_uword (vring->avail);
140 addr.used_user_addr = pointer_to_uword (vring->used);
141 _IOCTL (vif->fd, VHOST_SET_VRING_ADDR, &addr);
144 file.fd = vring->kick_fd;
145 _IOCTL (vif->fd, VHOST_SET_VRING_KICK, &file);
146 file.fd = vring->call_fd;
147 _IOCTL (vif->fd, VHOST_SET_VRING_CALL, &file);
148 file.fd = vif->tap_fd;
149 _IOCTL (vif->fd, VHOST_NET_SET_BACKEND, &file);
156 virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring)
158 u16 used = vring->desc_in_use;
159 u16 last = vring->last_used_idx;
160 u16 mask = vring->size - 1;
164 vlib_buffer_free (vm, &vring->buffers[last & mask], 1);
171 virtio_vring_free (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
173 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);
175 clib_file_del_by_index (&file_main, vring->call_file_index);
176 close (vring->kick_fd);
177 close (vring->call_fd);
181 virtio_free_used_desc (vm, vring);
183 virtio_free_rx_buffers (vm, vring);
184 clib_mem_free (vring->used);
187 clib_mem_free (vring->desc);
189 clib_mem_free (vring->avail);
190 if (vring->queue_id % 2)
192 vlib_buffer_free_no_next (vm, vring->indirect_buffers, vring->size);
194 vec_free (vring->buffers);
195 vec_free (vring->indirect_buffers);
200 virtio_vring_set_numa_node (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
202 vnet_main_t *vnm = vnet_get_main ();
204 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);
206 vnet_get_device_input_thread_index (vnm, vif->hw_if_index,
208 vring->buffer_pool_index =
209 vlib_buffer_pool_get_default_for_numa (vm,
211 [thread_index]->numa_node);
215 virtio_set_net_hdr_size (virtio_if_t * vif)
217 if (vif->features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF) ||
218 vif->features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1))
219 vif->virtio_net_hdr_sz = sizeof (struct virtio_net_hdr_v1);
221 vif->virtio_net_hdr_sz = sizeof (struct virtio_net_hdr);
225 virtio_show (vlib_main_t * vm, u32 * hw_if_indices, u8 show_descr, u32 type)
227 u32 i, j, hw_if_index;
229 vnet_main_t *vnm = &vnet_main;
230 virtio_main_t *mm = &virtio_main;
231 virtio_vring_t *vring;
237 struct feat_struct *feat_entry;
239 static struct feat_struct feat_array[] = {
240 #define _(s,b) { .str = #s, .bit = b, },
241 foreach_virtio_net_features
246 struct feat_struct *flag_entry;
247 static struct feat_struct flags_array[] = {
248 #define _(b,e,s) { .bit = b, .str = s, },
249 foreach_virtio_if_flag
257 for (hw_if_index = 0; hw_if_index < vec_len (hw_if_indices); hw_if_index++)
259 vnet_hw_interface_t *hi =
260 vnet_get_hw_interface (vnm, hw_if_indices[hw_if_index]);
261 vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
262 if (vif->type != type)
264 vlib_cli_output (vm, "Interface: %U (ifindex %d)",
265 format_vnet_hw_if_index_name, vnm,
266 hw_if_indices[hw_if_index], vif->hw_if_index);
267 if (type == VIRTIO_IF_TYPE_PCI)
269 vlib_cli_output (vm, " PCI Address: %U", format_vlib_pci_addr,
272 if (type == VIRTIO_IF_TYPE_TAP)
274 if (vif->host_if_name)
275 vlib_cli_output (vm, " name \"%s\"", vif->host_if_name);
277 vlib_cli_output (vm, " host-ns \"%s\"", vif->net_ns);
278 vlib_cli_output (vm, " fd %d", vif->fd);
279 vlib_cli_output (vm, " tap-fd %d", vif->tap_fd);
280 vlib_cli_output (vm, " gso-enabled %d", vif->gso_enabled);
282 vlib_cli_output (vm, " Mac Address: %U", format_ethernet_address,
284 vlib_cli_output (vm, " Device instance: %u", vif->dev_instance);
285 vlib_cli_output (vm, " flags 0x%x", vif->flags);
286 flag_entry = (struct feat_struct *) &flags_array;
287 while (flag_entry->str)
289 if (vif->flags & (1ULL << flag_entry->bit))
290 vlib_cli_output (vm, " %s (%d)", flag_entry->str,
294 if (type == VIRTIO_IF_TYPE_PCI)
296 device_status (vm, vif);
298 vlib_cli_output (vm, " features 0x%lx", vif->features);
299 feat_entry = (struct feat_struct *) &feat_array;
300 while (feat_entry->str)
302 if (vif->features & (1ULL << feat_entry->bit))
303 vlib_cli_output (vm, " %s (%d)", feat_entry->str,
307 vlib_cli_output (vm, " remote-features 0x%lx", vif->remote_features);
308 feat_entry = (struct feat_struct *) &feat_array;
309 while (feat_entry->str)
311 if (vif->remote_features & (1ULL << feat_entry->bit))
312 vlib_cli_output (vm, " %s (%d)", feat_entry->str,
316 vec_foreach_index (i, vif->vrings)
319 vring = vec_elt_at_index (vif->vrings, i);
320 vlib_cli_output (vm, " Virtqueue (%s)", (i & 1) ? "TX" : "RX");
322 " qsz %d, last_used_idx %d, desc_next %d, desc_in_use %d",
323 vring->size, vring->last_used_idx, vring->desc_next,
326 " avail.flags 0x%x avail.idx %d used.flags 0x%x used.idx %d",
327 vring->avail->flags, vring->avail->idx,
328 vring->used->flags, vring->used->idx);
329 if (type == VIRTIO_IF_TYPE_TAP)
331 vlib_cli_output (vm, " kickfd %d, callfd %d", vring->kick_fd,
336 vlib_cli_output (vm, "\n descriptor table:\n");
338 " id addr len flags next user_addr\n");
340 " ===== ================== ===== ====== ===== ==================\n");
342 for (j = 0; j < vring->size; j++)
344 struct vring_desc *desc = &vring->desc[j];
346 " %-5d 0x%016lx %-5d 0x%04x %-5d 0x%016lx\n",
349 desc->flags, desc->next, desc->addr);
358 * fd.io coding-style-patch-verification: ON
361 * eval: (c-set-style "gnu")