From: Jonah Palmer <jonah.palmer@oracle.com>
To: qemu-devel@nongnu.org
Cc: mst@redhat.com, raphael@enfabrica.net, kwolf@redhat.com,
hreitz@redhat.com, jasowang@redhat.com, pbonzini@redhat.com,
fam@euphon.net, eperezma@redhat.com, stefanha@redhat.com,
qemu-block@nongnu.org, schalla@marvell.com, leiyang@redhat.com,
virtio-fs@lists.linux.dev, si-wei.liu@oracle.com,
boris.ostrovsky@oracle.com, jonah.palmer@oracle.com
Subject: [PATCH 3/6] virtio: virtqueue_ordered_fill - VIRTIO_F_IN_ORDER support
Date: Mon, 6 May 2024 11:04:25 -0400 [thread overview]
Message-ID: <20240506150428.1203387-4-jonah.palmer@oracle.com> (raw)
In-Reply-To: <20240506150428.1203387-1-jonah.palmer@oracle.com>
Add VIRTIO_F_IN_ORDER feature support for virtqueue_fill operations.
The goal of the virtqueue_fill operation when the VIRTIO_F_IN_ORDER
feature has been negotiated is to search for this now-used element,
set its length, and mark the element as filled in the VirtQueue's
used_elems array.
By marking the element as filled, it will indicate that this element is
ready to be flushed, so long as the element is in-order.
Tested-by: Lei Yang <leiyang@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
---
hw/virtio/virtio.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index e6eb1bb453..064046b5e2 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -873,6 +873,28 @@ static void virtqueue_packed_fill(VirtQueue *vq, const VirtQueueElement *elem,
vq->used_elems[idx].ndescs = elem->ndescs;
}
+static void virtqueue_ordered_fill(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len)
+{
+ unsigned int i = vq->used_idx;
+
+ /* Search for element in vq->used_elems */
+ while (i != vq->last_avail_idx) {
+ /* Found element, set length and mark as filled */
+ if (vq->used_elems[i].index == elem->index) {
+ vq->used_elems[i].len = len;
+ vq->used_elems[i].filled = true;
+ break;
+ }
+
+ i += vq->used_elems[i].ndescs;
+
+ if (i >= vq->vring.num) {
+ i -= vq->vring.num;
+ }
+ }
+}
+
static void virtqueue_packed_fill_desc(VirtQueue *vq,
const VirtQueueElement *elem,
unsigned int idx,
@@ -923,7 +945,9 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
return;
}
- if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
+ if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_IN_ORDER)) {
+ virtqueue_ordered_fill(vq, elem, len);
+ } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) {
virtqueue_packed_fill(vq, elem, len, idx);
} else {
virtqueue_split_fill(vq, elem, len, idx);
--
2.39.3
next prev parent reply other threads:[~2024-05-06 15:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 15:04 [PATCH 0/6] virtio,vhost: Add VIRTIO_F_IN_ORDER support Jonah Palmer
2024-05-06 15:04 ` [PATCH 1/6] virtio: Add bool to VirtQueueElement Jonah Palmer
2024-05-09 12:32 ` Eugenio Perez Martin
2024-05-10 10:26 ` Jonah Palmer
2024-05-06 15:04 ` [PATCH 2/6] virtio: virtqueue_pop - VIRTIO_F_IN_ORDER support Jonah Palmer
2024-05-09 13:13 ` Eugenio Perez Martin
2024-05-10 10:52 ` Jonah Palmer
2024-05-06 15:04 ` Jonah Palmer [this message]
2024-05-09 14:08 ` [PATCH 3/6] virtio: virtqueue_ordered_fill " Eugenio Perez Martin
2024-05-10 12:01 ` Jonah Palmer
2024-05-06 15:04 ` [PATCH 4/6] virtio: virtqueue_ordered_flush " Jonah Palmer
2024-05-10 7:48 ` Eugenio Perez Martin
2024-05-10 13:07 ` Jonah Palmer
2024-05-06 15:04 ` [PATCH 5/6] vhost, vhost-user: Add VIRTIO_F_IN_ORDER to vhost feature bits Jonah Palmer via
2024-05-06 15:04 ` [PATCH 6/6] virtio: Add VIRTIO_F_IN_ORDER property definition Jonah Palmer
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