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/*
* Copyright (c) 2015 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.
*/
#ifndef __VIRTIO_INLINE_H__
#define __VIRTIO_INLINE_H__
#define foreach_virtio_input_error \
_ (BUFFER_ALLOC, "buffer alloc error") \
_ (UNKNOWN, "unknown")
typedef enum
{
#define _(f, s) VIRTIO_INPUT_ERROR_##f,
foreach_virtio_input_error
#undef _
VIRTIO_INPUT_N_ERROR,
} virtio_input_error_t;
static_always_inline void
virtio_refill_vring_split (vlib_main_t *vm, virtio_if_t *vif,
virtio_if_type_t type, virtio_vring_t *vring,
const int hdr_sz, u32 node_index)
{
u16 used, next, avail, n_slots, n_refill;
u16 sz = vring->size;
u16 mask = sz - 1;
more:
used = vring->desc_in_use;
if (sz - used < sz / 8)
return;
/* deliver free buffers in chunks of 64 */
n_refill = clib_min (sz - used, 64);
next = vring->desc_next;
avail = vring->avail->idx;
n_slots = vlib_buffer_alloc_to_ring_from_pool (
vm, vring->buffers, next, vring->size, n_refill, vring->buffer_pool_index);
if (PREDICT_FALSE (n_slots != n_refill))
{
vlib_error_count (vm, node_index, VIRTIO_INPUT_ERROR_BUFFER_ALLOC,
n_refill - n_slots);
if (n_slots == 0)
return;
}
while (n_slots)
{
vring_desc_t *d = &vring->desc[next];
;
vlib_buffer_t *b = vlib_get_buffer (vm, vring->buffers[next]);
/*
* current_data may not be initialized with 0 and may contain
* previous offset. Here we want to make sure, it should be 0
* initialized.
*/
b->current_data = -hdr_sz;
clib_memset (vlib_buffer_get_current (b), 0, hdr_sz);
d->addr = ((type == VIRTIO_IF_TYPE_PCI) ?
vlib_buffer_get_current_pa (vm, b) :
pointer_to_uword (vlib_buffer_get_current (b)));
d->len = vlib_buffer_get_default_data_size (vm) + hdr_sz;
d->flags = VRING_DESC_F_WRITE;
vring->avail->ring[avail & mask] = next;
avail++;
next = (next + 1) & mask;
n_slots--;
used++;
}
clib_atomic_store_seq_cst (&vring->avail->idx, avail);
vring->desc_next = next;
vring->desc_in_use = used;
if ((clib_atomic_load_seq_cst (&vring->used->flags) &
VRING_USED_F_NO_NOTIFY) == 0)
{
virtio_kick (vm, vring, vif);
}
goto more;
}
static_always_inline void
virtio_refill_vring_packed (vlib_main_t *vm, virtio_if_t *vif,
virtio_if_type_t type, virtio_vring_t *vring,
const int hdr_sz, u32 node_index)
{
u16 used, next, n_slots, n_refill, flags = 0, first_desc_flags;
u16 sz = vring->size;
more:
used = vring->desc_in_use;
if (sz == used)
return;
/* deliver free buffers in chunks of 64 */
n_refill = clib_min (sz - used, 64);
next = vring->desc_next;
first_desc_flags = vring->packed_desc[next].flags;
n_slots = vlib_buffer_alloc_to_ring_from_pool (
vm, vring->buffers, next, sz, n_refill, vring->buffer_pool_index);
if (PREDICT_FALSE (n_slots != n_refill))
{
vlib_error_count (vm, node_index, VIRTIO_INPUT_ERROR_BUFFER_ALLOC,
n_refill - n_slots);
if (n_slots == 0)
return;
}
while (n_slots)
{
vring_packed_desc_t *d = &vring->packed_desc[next];
vlib_buffer_t *b = vlib_get_buffer (vm, vring->buffers[next]);
/*
* current_data may not be initialized with 0 and may contain
* previous offset. Here we want to make sure, it should be 0
* initialized.
*/
b->current_data = -hdr_sz;
clib_memset (vlib_buffer_get_current (b), 0, hdr_sz);
d->addr = ((type == VIRTIO_IF_TYPE_PCI) ?
vlib_buffer_get_current_pa (vm, b) :
pointer_to_uword (vlib_buffer_get_current (b)));
d->len = vlib_buffer_get_default_data_size (vm) + hdr_sz;
if (vring->avail_wrap_counter)
flags = (VRING_DESC_F_AVAIL | VRING_DESC_F_WRITE);
else
flags = (VRING_DESC_F_USED | VRING_DESC_F_WRITE);
d->id = next;
if (vring->desc_next == next)
first_desc_flags = flags;
else
d->flags = flags;
next++;
if (next >= sz)
{
next = 0;
vring->avail_wrap_counter ^= 1;
}
n_slots--;
used++;
}
CLIB_MEMORY_STORE_BARRIER ();
vring->packed_desc[vring->desc_next].flags = first_desc_flags;
vring->desc_next = next;
vring->desc_in_use = used;
CLIB_MEMORY_BARRIER ();
if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
{
virtio_kick (vm, vring, vif);
}
goto more;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
