-/*-
- * BSD LICENSE
- *
- * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
*/
#ifndef _VIRTIO_RING_H_
/* This means the buffer contains a list of buffer descriptors. */
#define VRING_DESC_F_INDIRECT 4
+/* This flag means the descriptor was made available by the driver */
+#define VRING_PACKED_DESC_F_AVAIL (1 << 7)
+/* This flag means the descriptor was used by the device */
+#define VRING_PACKED_DESC_F_USED (1 << 15)
+
+/* Frequently used combinations */
+#define VRING_PACKED_DESC_F_AVAIL_USED (VRING_PACKED_DESC_F_AVAIL | \
+ VRING_PACKED_DESC_F_USED)
+
/* The Host uses this in used->flags to advise the Guest: don't kick me
* when you add a buffer. It's unreliable, so it's simply an
* optimization. Guest will still kick if it's out of buffers. */
struct vring_used_elem ring[0];
};
+/* For support of packed virtqueues in Virtio 1.1 the format of descriptors
+ * looks like this.
+ */
+struct vring_packed_desc {
+ uint64_t addr;
+ uint32_t len;
+ uint16_t id;
+ uint16_t flags;
+};
+
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
+struct vring_packed_desc_event {
+ uint16_t desc_event_off_wrap;
+ uint16_t desc_event_flags;
+};
+
+struct vring_packed {
+ unsigned int num;
+ struct vring_packed_desc *desc;
+ struct vring_packed_desc_event *driver;
+ struct vring_packed_desc_event *device;
+};
+
struct vring {
unsigned int num;
struct vring_desc *desc;
#define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
-static inline int
-vring_size(unsigned int num, unsigned long align)
+static inline size_t
+vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align)
{
- int size;
+ size_t size;
+
+ if (virtio_with_packed_queue(hw)) {
+ size = num * sizeof(struct vring_packed_desc);
+ size += sizeof(struct vring_packed_desc_event);
+ size = RTE_ALIGN_CEIL(size, align);
+ size += sizeof(struct vring_packed_desc_event);
+ return size;
+ }
size = num * sizeof(struct vring_desc);
size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
(num * sizeof(struct vring_used_elem));
return size;
}
-
static inline void
-vring_init(struct vring *vr, unsigned int num, uint8_t *p,
- unsigned long align)
+vring_init_split(struct vring *vr, uint8_t *p, unsigned long align,
+ unsigned int num)
{
vr->num = num;
vr->desc = (struct vring_desc *) p;
RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
}
+static inline void
+vring_init_packed(struct vring_packed *vr, uint8_t *p, unsigned long align,
+ unsigned int num)
+{
+ vr->num = num;
+ vr->desc = (struct vring_packed_desc *)p;
+ vr->driver = (struct vring_packed_desc_event *)(p +
+ vr->num * sizeof(struct vring_packed_desc));
+ vr->device = (struct vring_packed_desc_event *)
+ RTE_ALIGN_CEIL(((uintptr_t)vr->driver +
+ sizeof(struct vring_packed_desc_event)), align);
+}
+
/*
* The following is used with VIRTIO_RING_F_EVENT_IDX.
* Assuming a given event_idx value from the other size, if we have