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From 073595e503c4f13a7e598bdb83b2ea724d169cbf Mon Sep 17 00:00:00 2001
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From: Si-Wei Liu <si-wei.liu@oracle.com>
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Date: Fri, 6 May 2022 19:28:17 -0700
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Subject: [PATCH 6/7] vhost-vdpa: change name and polarity for
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vhost_vdpa_one_time_request()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cindy Lu <lulu@redhat.com>
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RH-MergeRequest: 203: vdpa :sync the Multiqueue fixes for vhost-vDPA
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RH-Commit: [6/7] 9ab7ee150e1876a170b56db36e94a5b3bbf09535
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RH-Bugzilla: 2095794
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RH-Acked-by: MST <mst@redhat.com>
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RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
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RH-Acked-by: Jason Wang <jasowang@redhat.com>
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The name vhost_vdpa_one_time_request() was confusing. No
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matter whatever it returns, its typical occurrence had
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always been at requests that only need to be applied once.
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And the name didn't suggest what it actually checks for.
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Change it to vhost_vdpa_first_dev() with polarity flipped
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for better readibility of code. That way it is able to
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reflect what the check is really about.
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This call is applicable to request which performs operation
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only once, before queues are set up, and usually at the beginning
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of the caller function. Document the requirement for it in place.
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Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
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Message-Id: <1651890498-24478-7-git-send-email-si-wei.liu@oracle.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit d71b0609fc04217e28d17009f04d74b08be6f466)
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Signed-off-by: Cindy Lu <lulu@redhat.com>
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---
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hw/virtio/vhost-vdpa.c | 23 +++++++++++++++--------
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1 file changed, 15 insertions(+), 8 deletions(-)
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diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
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index a9be24776a..38bbcb3c18 100644
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--- a/hw/virtio/vhost-vdpa.c
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+++ b/hw/virtio/vhost-vdpa.c
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@@ -319,11 +319,18 @@ static void vhost_vdpa_get_iova_range(struct vhost_vdpa *v)
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v->iova_range.last);
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}
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-static bool vhost_vdpa_one_time_request(struct vhost_dev *dev)
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+/*
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+ * The use of this function is for requests that only need to be
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+ * applied once. Typically such request occurs at the beginning
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+ * of operation, and before setting up queues. It should not be
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+ * used for request that performs operation until all queues are
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+ * set, which would need to check dev->vq_index_end instead.
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+ */
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+static bool vhost_vdpa_first_dev(struct vhost_dev *dev)
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{
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struct vhost_vdpa *v = dev->opaque;
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- return v->index != 0;
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+ return v->index == 0;
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}
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static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp)
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@@ -351,7 +358,7 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp)
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vhost_vdpa_get_iova_range(v);
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- if (vhost_vdpa_one_time_request(dev)) {
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+ if (!vhost_vdpa_first_dev(dev)) {
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return 0;
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}
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@@ -468,7 +475,7 @@ static int vhost_vdpa_memslots_limit(struct vhost_dev *dev)
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static int vhost_vdpa_set_mem_table(struct vhost_dev *dev,
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struct vhost_memory *mem)
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{
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- if (vhost_vdpa_one_time_request(dev)) {
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+ if (!vhost_vdpa_first_dev(dev)) {
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return 0;
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}
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@@ -496,7 +503,7 @@ static int vhost_vdpa_set_features(struct vhost_dev *dev,
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{
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int ret;
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- if (vhost_vdpa_one_time_request(dev)) {
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+ if (!vhost_vdpa_first_dev(dev)) {
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return 0;
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}
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@@ -525,7 +532,7 @@ static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev)
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features &= f;
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- if (!vhost_vdpa_one_time_request(dev)) {
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+ if (vhost_vdpa_first_dev(dev)) {
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r = vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &features);
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if (r) {
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return -EFAULT;
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@@ -670,7 +677,7 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started)
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static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base,
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struct vhost_log *log)
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{
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- if (vhost_vdpa_one_time_request(dev)) {
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+ if (!vhost_vdpa_first_dev(dev)) {
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return 0;
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}
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@@ -739,7 +746,7 @@ static int vhost_vdpa_get_features(struct vhost_dev *dev,
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static int vhost_vdpa_set_owner(struct vhost_dev *dev)
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{
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- if (vhost_vdpa_one_time_request(dev)) {
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+ if (!vhost_vdpa_first_dev(dev)) {
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return 0;
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}
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--
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2.31.1
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