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/*
*------------------------------------------------------------------
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <sys/ioctl.h>
#include <linux/virtio_net.h>
#include <linux/vhost.h>
#include <sys/eventfd.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/devices/virtio/virtio.h>
virtio_main_t virtio_main;
#define _IOCTL(fd,a,...) \
if (ioctl (fd, a, __VA_ARGS__) < 0) \
{ \
err = clib_error_return_unix (0, "ioctl(" #a ")"); \
goto error; \
}
static clib_error_t *
call_read_ready (clib_file_t * uf)
{
virtio_main_t *nm = &virtio_main;
vnet_main_t *vnm = vnet_get_main ();
u16 qid = uf->private_data & 0xFFFF;
virtio_if_t *vif =
vec_elt_at_index (nm->interfaces, uf->private_data >> 16);
u64 b;
CLIB_UNUSED (ssize_t size) = read (uf->file_descriptor, &b, sizeof (b));
if ((qid & 1) == 0)
vnet_device_input_set_interrupt_pending (vnm, vif->hw_if_index, qid);
return 0;
}
clib_error_t *
virtio_vring_init (vlib_main_t * vm, virtio_if_t * vif, u16 idx, u16 sz)
{
clib_error_t *err = 0;
virtio_vring_t *vring;
struct vhost_vring_state state = { 0 };
struct vhost_vring_addr addr = { 0 };
struct vhost_vring_file file = { 0 };
clib_file_t t = { 0 };
int i;
if (!is_pow2 (sz))
return clib_error_return (0, "ring size must be power of 2");
if (sz > 32768)
return clib_error_return (0, "ring size must be 32768 or lower");
if (sz == 0)
sz = 256;
vec_validate_aligned (vif->vrings, idx, CLIB_CACHE_LINE_BYTES);
vring = vec_elt_at_index (vif->vrings, idx);
i = sizeof (struct vring_desc) * sz;
i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
vring->desc = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
memset (vring->desc, 0, i);
i = sizeof (struct vring_avail) + sz * sizeof (vring->avail->ring[0]);
i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
vring->avail = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
memset (vring->avail, 0, i);
// tell kernel that we don't need interrupt
vring->avail->flags = VIRTIO_RING_FLAG_MASK_INT;
i = sizeof (struct vring_used) + sz * sizeof (struct vring_used_elem);
i = round_pow2 (i, CLIB_CACHE_LINE_BYTES);
vring->used = clib_mem_alloc_aligned (i, CLIB_CACHE_LINE_BYTES);
memset (vring->used, 0, i);
ASSERT (vring->buffers == 0);
vec_validate_aligned (vring->buffers, sz * 2, CLIB_CACHE_LINE_BYTES);
vring->size = sz;
vring->call_fd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
vring->kick_fd = eventfd (0, EFD_CLOEXEC);
t.read_function = call_read_ready;
t.file_descriptor = vring->call_fd;
t.private_data = vif->dev_instance << 16 | idx;
vring->call_file_index = clib_file_add (&file_main, &t);
state.index = idx;
state.num = sz;
_IOCTL (vif->fd, VHOST_SET_VRING_NUM, &state);
addr.index = idx;
addr.flags = 0;
addr.desc_user_addr = pointer_to_uword (vring->desc);
addr.avail_user_addr = pointer_to_uword (vring->avail);
addr.used_user_addr = pointer_to_uword (vring->used);
_IOCTL (vif->fd, VHOST_SET_VRING_ADDR, &addr);
file.index = idx;
file.fd = vring->kick_fd;
_IOCTL (vif->fd, VHOST_SET_VRING_KICK, &file);
file.fd = vring->call_fd;
_IOCTL (vif->fd, VHOST_SET_VRING_CALL, &file);
file.fd = vif->tap_fd;
_IOCTL (vif->fd, VHOST_NET_SET_BACKEND, &file);
error:
return err;
}
static_always_inline void
virtio_free_rx_buffers (vlib_main_t * vm, virtio_vring_t * vring)
{
u16 used = vring->desc_in_use;
u16 next = vring->desc_next;
u16 mask = vring->size - 1;
while (used)
{
vlib_buffer_free (vm, &vring->buffers[next], 1);
next = (next + 1) & mask;
used--;
}
}
clib_error_t *
virtio_vring_free (vlib_main_t * vm, virtio_if_t * vif, u32 idx)
{
virtio_vring_t *vring = vec_elt_at_index (vif->vrings, idx);
clib_file_del_by_index (&file_main, vring->call_file_index);
close (vring->kick_fd);
close (vring->call_fd);
if (vring->used)
{
if ((idx & 1) == 1)
virtio_free_used_desc (vm, vring);
else
virtio_free_rx_buffers (vm, vring);
clib_mem_free (vring->used);
}
if (vring->desc)
clib_mem_free (vring->desc);
if (vring->avail)
clib_mem_free (vring->avail);
vec_free (vring->buffers);
return 0;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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