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dataplane: allow virtio-1 devices

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Handle endianness conversion for virtio-1 virtqueues correctly.

Note that dataplane now needs to be built per-target.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2015-06-04 12:34:13 +02:00 committed by Michael S. Tsirkin
parent ab223c9518
commit f5a5628cf0
1 changed files with 26 additions and 21 deletions
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47
hw/virtio/dataplane/vring.c
View File

@ -157,15 +157,18 @@ bool vring_should_notify(VirtIODevice *vdev, Vring *vring)
}
static int get_desc(Vring *vring, VirtQueueElement *elem,
static int get_desc(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem,
struct vring_desc *desc)
{
unsigned *num;
struct iovec *iov;
hwaddr *addr;
MemoryRegion *mr;
int is_write = virtio_tswap16(vdev, desc->flags) & VRING_DESC_F_WRITE;
uint32_t len = virtio_tswap32(vdev, desc->len);
uint64_t desc_addr = virtio_tswap64(vdev, desc->addr);
if (desc->flags & VRING_DESC_F_WRITE) {
if (is_write) {
num = &elem->in_num;
iov = &elem->in_sg[*num];
addr = &elem->in_addr[*num];
@ -189,18 +192,17 @@ static int get_desc(Vring *vring, VirtQueueElement *elem,
}
/* TODO handle non-contiguous memory across region boundaries */
iov->iov_base = vring_map(&mr, desc->addr, desc->len,
desc->flags & VRING_DESC_F_WRITE);
iov->iov_base = vring_map(&mr, desc_addr, len, is_write);
if (!iov->iov_base) {
error_report("Failed to map descriptor addr %#" PRIx64 " len %u",
(uint64_t)desc->addr, desc->len);
(uint64_t)desc_addr, len);
return -EFAULT;
}
/* The MemoryRegion is looked up again and unref'ed later, leave the
* ref in place. */
iov->iov_len = desc->len;
*addr = desc->addr;
iov->iov_len = len;
*addr = desc_addr;
*num += 1;
return 0;
}
@ -222,21 +224,23 @@ static int get_indirect(VirtIODevice *vdev, Vring *vring,
struct vring_desc desc;
unsigned int i = 0, count, found = 0;
int ret;
uint32_t len = virtio_tswap32(vdev, indirect->len);
uint64_t addr = virtio_tswap64(vdev, indirect->addr);
/* Sanity check */
if (unlikely(indirect->len % sizeof(desc))) {
if (unlikely(len % sizeof(desc))) {
error_report("Invalid length in indirect descriptor: "
"len %#x not multiple of %#zx",
indirect->len, sizeof(desc));
len, sizeof(desc));
vring->broken = true;
return -EFAULT;
}
count = indirect->len / sizeof(desc);
count = len / sizeof(desc);
/* Buffers are chained via a 16 bit next field, so
* we can have at most 2^16 of these. */
if (unlikely(count > USHRT_MAX + 1)) {
error_report("Indirect buffer length too big: %d", indirect->len);
error_report("Indirect buffer length too big: %d", len);
vring->broken = true;
return -EFAULT;
}
@ -247,12 +251,12 @@ static int get_indirect(VirtIODevice *vdev, Vring *vring,
/* Translate indirect descriptor */
desc_ptr = vring_map(&mr,
indirect->addr + found * sizeof(desc),
addr + found * sizeof(desc),
sizeof(desc), false);
if (!desc_ptr) {
error_report("Failed to map indirect descriptor "
"addr %#" PRIx64 " len %zu",
(uint64_t)indirect->addr + found * sizeof(desc),
(uint64_t)addr + found * sizeof(desc),
sizeof(desc));
vring->broken = true;
return -EFAULT;
@ -270,19 +274,20 @@ static int get_indirect(VirtIODevice *vdev, Vring *vring,
return -EFAULT;
}
if (unlikely(desc.flags & VRING_DESC_F_INDIRECT)) {
if (unlikely(virtio_tswap16(vdev, desc.flags)
& VRING_DESC_F_INDIRECT)) {
error_report("Nested indirect descriptor");
vring->broken = true;
return -EFAULT;
}
ret = get_desc(vring, elem, &desc);
ret = get_desc(vdev, vring, elem, &desc);
if (ret < 0) {
vring->broken |= (ret == -EFAULT);
return ret;
}
i = desc.next;
} while (desc.flags & VRING_DESC_F_NEXT);
i = virtio_tswap16(vdev, desc.next);
} while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT);
return 0;
}
@ -383,7 +388,7 @@ int vring_pop(VirtIODevice *vdev, Vring *vring,
/* Ensure descriptor is loaded before accessing fields */
barrier();
if (desc.flags & VRING_DESC_F_INDIRECT) {
if (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_INDIRECT) {
ret = get_indirect(vdev, vring, elem, &desc);
if (ret < 0) {
goto out;
@ -391,13 +396,13 @@ int vring_pop(VirtIODevice *vdev, Vring *vring,
continue;
}
ret = get_desc(vring, elem, &desc);
ret = get_desc(vdev, vring, elem, &desc);
if (ret < 0) {
goto out;
}
i = desc.next;
} while (desc.flags & VRING_DESC_F_NEXT);
i = virtio_tswap16(vdev, desc.next);
} while (virtio_tswap16(vdev, desc.flags) & VRING_DESC_F_NEXT);
/* On success, increment avail index. */
vring->last_avail_idx++;