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From 9a290bd74f983f3a65aa9ec5df2da9aa94bfdecd Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Thu, 21 Jul 2022 16:05:42 +0200
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Subject: [PATCH 25/32] vdpa: Extract get features part from
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vhost_vdpa_get_max_queue_pairs
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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: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 108: Net Control Virtqueue shadow Support
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RH-Commit: [25/27] 654ad68e10a4df84cced923c64e72d500721ad67 (eperezmartin/qemu-kvm)
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RH-Bugzilla: 1939363
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/1939363
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Upstream Status: git://git.qemu.org/qemu.git
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commit 8170ab3f43989680491d00f1017f60b25d346114
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:44 2022 +0200
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vdpa: Extract get features part from vhost_vdpa_get_max_queue_pairs
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To know the device features is needed for CVQ SVQ, so SVQ knows if it
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can handle all commands or not. Extract from
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vhost_vdpa_get_max_queue_pairs so we can reuse it.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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net/vhost-vdpa.c | 30 ++++++++++++++++++++----------
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1 file changed, 20 insertions(+), 10 deletions(-)
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diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
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index df42822463..8b76dac966 100644
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--- a/net/vhost-vdpa.c
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+++ b/net/vhost-vdpa.c
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@@ -474,20 +474,24 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
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return nc;
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}
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-static int vhost_vdpa_get_max_queue_pairs(int fd, int *has_cvq, Error **errp)
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+static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp)
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+{
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+ int ret = ioctl(fd, VHOST_GET_FEATURES, features);
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+ if (unlikely(ret < 0)) {
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+ error_setg_errno(errp, errno,
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+ "Fail to query features from vhost-vDPA device");
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+ }
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+ return ret;
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+}
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+
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+static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features,
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+ int *has_cvq, Error **errp)
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{
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unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
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g_autofree struct vhost_vdpa_config *config = NULL;
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__virtio16 *max_queue_pairs;
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- uint64_t features;
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int ret;
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- ret = ioctl(fd, VHOST_GET_FEATURES, &features);
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- if (ret) {
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- error_setg(errp, "Fail to query features from vhost-vDPA device");
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- return ret;
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- }
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-
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if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) {
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*has_cvq = 1;
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} else {
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@@ -517,10 +521,11 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
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NetClientState *peer, Error **errp)
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{
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const NetdevVhostVDPAOptions *opts;
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+ uint64_t features;
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int vdpa_device_fd;
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g_autofree NetClientState **ncs = NULL;
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NetClientState *nc;
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- int queue_pairs, i, has_cvq = 0;
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+ int queue_pairs, r, i, has_cvq = 0;
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assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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opts = &netdev->u.vhost_vdpa;
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@@ -534,7 +539,12 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
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return -errno;
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}
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- queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd,
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+ r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp);
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+ if (unlikely(r < 0)) {
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+ return r;
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+ }
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+
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+ queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features,
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&has_cvq, errp);
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if (queue_pairs < 0) {
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qemu_close(vdpa_device_fd);
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--
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2.31.1
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