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-rw-r--r--src/vnet/devices/virtio/virtio_inline.h182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/vnet/devices/virtio/virtio_inline.h b/src/vnet/devices/virtio/virtio_inline.h
new file mode 100644
index 00000000000..209817d48c7
--- /dev/null
+++ b/src/vnet/devices/virtio/virtio_inline.h
@@ -0,0 +1,182 @@
+/*
+ * 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:
+ */