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/unix/unix.h>
30 #include <vnet/ethernet/ethernet.h>
31 #include <vnet/ip/ip4_packet.h>
32 #include <vnet/ip/ip6_packet.h>
33 #include <vnet/devices/virtio/virtio.h>
35 virtio_main_t virtio_main;
37 #define _IOCTL(fd,a,...) \
38 if (ioctl (fd, a, __VA_ARGS__) < 0) \
40 err = clib_error_return_unix (0, "ioctl(" #a ")"); \
45 call_read_ready (clib_file_t * uf)
47 virtio_main_t *nm = &virtio_main;
48 vnet_main_t *vnm = vnet_get_main ();
49 u16 qid = uf->private_data & 0xFFFF;
51 vec_elt_at_index (nm->interfaces, uf->private_data >> 16);
54 CLIB_UNUSED (ssize_t size) = read (uf->file_descriptor, &b, sizeof (b));
56 vnet_device_input_set_interrupt_pending (vnm, vif->hw_if_index, qid);
63 virtio_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx, u16 sz)
65 clib_error_t *err = 0;
66 virtio_vring_t *vring;
67 struct vhost_vring_state state = { 0 };
68 struct vhost_vring_addr addr = { 0 };
69 struct vhost_vring_file file = { 0 };
70 clib_file_t t = { 0 };
74 return clib_error_return (0, "ring size must be power of 2");
77 return clib_error_return (0, "ring size must be 32768 or lower");
82 vec_validate_aligned (vif->vrings, idx, CLIB_CACHE_LINE_BYTES);
83 vring = vec_elt_at_index (vif->vrings, idx);
85 i = sizeof (struct vring_desc) * sz;
86 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
87 vring->desc = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
88 clib_memset (vring->desc, 0, i);
90 i = sizeof (struct vring_avail) + sz * sizeof (vring->avail->ring[0]);
91 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
92 vring->avail = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
93 clib_memset (vring->avail, 0, i);
94 // tell kernel that we don't need interrupt
95 vring->avail->flags = VIRTIO_RING_FLAG_MASK_INT;
97 i = sizeof (struct vring_used) + sz * sizeof (struct vring_used_elem);
98 i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
99 vring->used = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
100 clib_memset (vring->used, 0, i);
102 ASSERT (vring->buffers == 0);
103 vec_validate_aligned (vring->buffers, sz, CLIB_CACHE_LINE_BYTES);
106 vring->call_fd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
107 vring->kick_fd = eventfd (0, EFD_CLOEXEC);
109 t.read_function = call_read_ready;
110 t.file_descriptor = vring->call_fd;
111 t.private_data = vif->dev_instance << 16 | idx;
112 t.description = format (0, "%U vring %u", format_virtio_device_name,
113 vif->dev_instance, idx);
114 vring->call_file_index = clib_file_add (&file_main, &t);
118 _IOCTL (vif->fd, VHOST_SET_VRING_NUM, &state);
122 addr.desc_user_addr = pointer_to_uword (vring->desc);
123 addr.avail_user_addr = pointer_to_uword (vring->avail);
124 addr.used_user_addr = pointer_to_uword (vring->used);
125 _IOCTL (vif->fd, VHOST_SET_VRING_ADDR, &addr);
128 file.fd = vring->kick_fd;
129 _IOCTL (vif->fd, VHOST_SET_VRING_KICK, &file);
130 file.fd = vring->call_fd;
131 _IOCTL (vif->fd, VHOST_SET_VRING_CALL, &file);
132 file.fd = vif->tap_fd;
133 _IOCTL (vif->fd, VHOST_NET_SET_BACKEND, &file);
139 static_always_inline void
140 virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring)
142 u16 used = vring->desc_in_use;
143 u16 last = vring->last_used_idx;
144 u16 mask = vring->size - 1;
148 vlib_buffer_free (vm, &vring->buffers[last & mask], 1);
155 virtio_vring_free (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
157 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);
159 clib_file_del_by_index (&file_main, vring->call_file_index);
160 close (vring->kick_fd);
161 close (vring->call_fd);
165 virtio_free_used_desc (vm, vring);
167 virtio_free_rx_buffers (vm, vring);
168 clib_mem_free (vring->used);
171 clib_mem_free (vring->desc);
173 clib_mem_free (vring->avail);
174 vec_free (vring->buffers);
179 * fd.io coding-style-patch-verification: ON
182 * eval: (c-set-style "gnu")