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[PATCH 02/22] vhost: move descriptor translation to vhost_svq_vring_writ
From: |
Eugenio Pérez |
Subject: |
[PATCH 02/22] vhost: move descriptor translation to vhost_svq_vring_write_descs |
Date: |
Fri, 8 Jul 2022 12:49:53 +0200 |
It's done for both in and out descriptors so it's better placed here.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
hw/virtio/vhost-shadow-virtqueue.c | 38 +++++++++++++++++++++---------
1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/hw/virtio/vhost-shadow-virtqueue.c
b/hw/virtio/vhost-shadow-virtqueue.c
index 9280285435..115d769b86 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -122,17 +122,35 @@ static bool vhost_svq_translate_addr(const
VhostShadowVirtqueue *svq,
return true;
}
-static void vhost_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
- const struct iovec *iovec, size_t num,
- bool more_descs, bool write)
+/**
+ * Write descriptors to SVQ vring
+ *
+ * @svq: The shadow virtqueue
+ * @sg: Cache for hwaddr
+ * @iovec: The iovec from the guest
+ * @num: iovec length
+ * @more_descs: True if more descriptors come in the chain
+ * @write: True if they are writeable descriptors
+ *
+ * Return true if success, false otherwise and print error.
+ */
+static bool vhost_svq_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
+ const struct iovec *iovec, size_t num,
+ bool more_descs, bool write)
{
uint16_t i = svq->free_head, last = svq->free_head;
unsigned n;
uint16_t flags = write ? cpu_to_le16(VRING_DESC_F_WRITE) : 0;
vring_desc_t *descs = svq->vring.desc;
+ bool ok;
if (num == 0) {
- return;
+ return true;
+ }
+
+ ok = vhost_svq_translate_addr(svq, sg, iovec, num);
+ if (unlikely(!ok)) {
+ return false;
}
for (n = 0; n < num; n++) {
@@ -150,6 +168,7 @@ static void vhost_vring_write_descs(VhostShadowVirtqueue
*svq, hwaddr *sg,
}
svq->free_head = le16_to_cpu(svq->desc_next[last]);
+ return true;
}
static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
@@ -169,21 +188,18 @@ static bool vhost_svq_add_split(VhostShadowVirtqueue *svq,
return false;
}
- ok = vhost_svq_translate_addr(svq, sgs, elem->out_sg, elem->out_num);
+ ok = vhost_svq_vring_write_descs(svq, sgs, elem->out_sg, elem->out_num,
+ elem->in_num > 0, false);
if (unlikely(!ok)) {
return false;
}
- vhost_vring_write_descs(svq, sgs, elem->out_sg, elem->out_num,
- elem->in_num > 0, false);
-
- ok = vhost_svq_translate_addr(svq, sgs, elem->in_sg, elem->in_num);
+ ok = vhost_svq_vring_write_descs(svq, sgs, elem->in_sg, elem->in_num,
false,
+ true);
if (unlikely(!ok)) {
return false;
}
- vhost_vring_write_descs(svq, sgs, elem->in_sg, elem->in_num, false, true);
-
/*
* Put the entry in the available array (but don't update avail->idx until
* they do sync).
--
2.31.1
- [PATCH 00/22] vdpa net devices Rx filter change notification with Shadow VQ, Eugenio Pérez, 2022/07/08
- [PATCH 01/22] vhost: Return earlier if used buffers overrun, Eugenio Pérez, 2022/07/08
- [PATCH 02/22] vhost: move descriptor translation to vhost_svq_vring_write_descs,
Eugenio Pérez <=
- [PATCH 03/22] vdpa: Clean vhost_vdpa_dev_start(dev, false), Eugenio Pérez, 2022/07/08
- [PATCH 04/22] virtio-net: Expose ctrl virtqueue logic, Eugenio Pérez, 2022/07/08
- [PATCH 06/22] vhost: Reorder vhost_svq_last_desc_of_chain, Eugenio Pérez, 2022/07/08
- [PATCH 05/22] vhost: Decouple vhost_svq_add_split from VirtQueueElement, Eugenio Pérez, 2022/07/08
- [PATCH 07/22] vhost: Add SVQElement, Eugenio Pérez, 2022/07/08
- [PATCH 08/22] vhost: Move last chain id to SVQ element, Eugenio Pérez, 2022/07/08
- [PATCH 11/22] vhost: add vhost_svq_push_elem, Eugenio Pérez, 2022/07/08
- [PATCH 10/22] vdpa: Small rename of error labels, Eugenio Pérez, 2022/07/08
- [PATCH 09/22] vhost: Add opaque member to SVQElement, Eugenio Pérez, 2022/07/08
- [PATCH 12/22] vhost: Add vhost_svq_inject, Eugenio Pérez, 2022/07/08