cfn/computing-offload
Code Issues Proposed changes
79c4324644
computing-offload/generic_vdpa/qemu/vdpa-Add-x-svq-to-NetdevVhostVDPAOptions.patch
jiangdongxu 79c4324644 add generic_vdpa basecode 
Change-Id: I2d302dda68298877c65c99147f5bf22186a59aac
2024-09-19 17:19:46 +08:00

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7.2 KiB
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From 3f278509424df64a731f69f4599460eda9a8d133 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Wed, 20 Jul 2022 08:59:46 +0200
Subject: [PATCH] vdpa: Add x-svq to NetdevVhostVDPAOptions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Finally offering the possibility to enable SVQ from the command line.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: fangyi <eric.fangyi@huawei.com>
---
net/vhost-vdpa.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++--
qapi/net.json | 9 +++++-
2 files changed, 77 insertions(+), 4 deletions(-)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 6a0fcab443..460f9674d7 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -74,6 +74,28 @@ const int vdpa_feature_bits[] = {
VHOST_INVALID_FEATURE_BIT
};
+/** Supported device specific feature bits with SVQ */
+static const uint64_t vdpa_svq_device_features =
+ BIT_ULL(VIRTIO_NET_F_CSUM) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) |
+ BIT_ULL(VIRTIO_NET_F_MTU) |
+ BIT_ULL(VIRTIO_NET_F_MAC) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_ECN) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_UFO) |
+ BIT_ULL(VIRTIO_NET_F_HOST_TSO4) |
+ BIT_ULL(VIRTIO_NET_F_HOST_TSO6) |
+ BIT_ULL(VIRTIO_NET_F_HOST_ECN) |
+ BIT_ULL(VIRTIO_NET_F_HOST_UFO) |
+ BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) |
+ BIT_ULL(VIRTIO_NET_F_STATUS) |
+ BIT_ULL(VIRTIO_NET_F_CTRL_VQ) |
+ BIT_ULL(VIRTIO_F_ANY_LAYOUT) |
+ BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |
+ BIT_ULL(VIRTIO_NET_F_RSC_EXT) |
+ BIT_ULL(VIRTIO_NET_F_STANDBY);
+
VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
@@ -132,6 +154,7 @@ err_init:
static void vhost_vdpa_cleanup(NetClientState *nc)
{
VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
+ struct vhost_dev *dev = &s->vhost_net->dev;
/*
* If a peer NIC is attached, do not cleanup anything.
@@ -144,6 +167,9 @@ static void vhost_vdpa_cleanup(NetClientState *nc)
qemu_vfree(s->cvq_cmd_out_buffer);
qemu_vfree(s->cvq_cmd_in_buffer);
+ if (dev->vq_index + dev->nvqs == dev->vq_index_end) {
+ g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete);
+ }
if (s->vhost_net) {
vhost_net_cleanup(s->vhost_net);
g_free(s->vhost_net);
@@ -445,7 +471,9 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
int vdpa_device_fd,
int queue_pair_index,
int nvqs,
- bool is_datapath)
+ bool is_datapath,
+ bool svq,
+ VhostIOVATree *iova_tree)
{
NetClientState *nc = NULL;
VhostVDPAState *s;
@@ -463,6 +491,8 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
s->vhost_vdpa.device_fd = vdpa_device_fd;
s->vhost_vdpa.index = queue_pair_index;
+ s->vhost_vdpa.shadow_vqs_enabled = svq;
+ s->vhost_vdpa.iova_tree = iova_tree;
if (!is_datapath) {
s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size,
vhost_vdpa_net_cvq_cmd_page_len());
@@ -473,6 +503,8 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops;
s->vhost_vdpa.shadow_vq_ops_opaque = s;
+ error_setg(&s->vhost_vdpa.migration_blocker,
+ "Migration disabled: vhost-vdpa uses CVQ.");
}
ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs);
if (ret) {
@@ -482,6 +514,14 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
return nc;
}
+static int vhost_vdpa_get_iova_range(int fd,
+ struct vhost_vdpa_iova_range *iova_range)
+{
+ int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range);
+
+ return ret < 0 ? -errno : 0;
+}
+
static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp)
{
int ret = ioctl(fd, VHOST_GET_FEATURES, features);
@@ -532,6 +572,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
uint64_t features;
int vdpa_device_fd;
g_autofree NetClientState **ncs = NULL;
+ g_autoptr(VhostIOVATree) iova_tree = NULL;
NetClientState *nc;
int queue_pairs, r, i, has_cvq = 0;
@@ -559,22 +600,45 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
return queue_pairs;
}
+ if (opts->x_svq) {
+ struct vhost_vdpa_iova_range iova_range;
+
+ uint64_t invalid_dev_features =
+ features & ~vdpa_svq_device_features &
+ /* Transport are all accepted at this point */
+ ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START,
+ VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START);
+
+ if (invalid_dev_features) {
+ error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64,
+ invalid_dev_features);
+ goto err_svq;
+ }
+
+ vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range);
+ iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last);
+ }
+
ncs = g_malloc0(sizeof(*ncs) * queue_pairs);
for (i = 0; i < queue_pairs; i++) {
ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
- vdpa_device_fd, i, 2, true);
+ vdpa_device_fd, i, 2, true, opts->x_svq,
+ iova_tree);
if (!ncs[i])
goto err;
}
if (has_cvq) {
nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
- vdpa_device_fd, i, 1, false);
+ vdpa_device_fd, i, 1, false,
+ opts->x_svq, iova_tree);
if (!nc)
goto err;
}
+ /* iova_tree ownership belongs to last NetClientState */
+ g_steal_pointer(&iova_tree);
return 0;
err:
@@ -583,6 +647,8 @@ err:
qemu_del_net_client(ncs[i]);
}
}
+
+err_svq:
qemu_close(vdpa_device_fd);
return -1;
diff --git a/qapi/net.json b/qapi/net.json
index 7fab2e7cd8..6a5460ce56 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -445,12 +445,19 @@
# @queues: number of queues to be created for multiqueue vhost-vdpa
# (default: 1)
#
+# @x-svq: Start device with (experimental) shadow virtqueue. (Since 7.1)
+# (default: false)
+#
+# Features:
+# @unstable: Member @x-svq is experimental.
+#
# Since: 5.1
##
{ 'struct': 'NetdevVhostVDPAOptions',
'data': {
'*vhostdev': 'str',
- '*queues': 'int' } }
+ '*queues': 'int',
+ '*x-svq': {'type': 'bool', 'features' : [ 'unstable'] } } }
##
# @NetClientDriver:
--
2.27.0
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