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qemu-kvm/kvm-virtio-net-Expose-ctrl-virtqueue-logic.patch

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From 49e91b34b62f5da147fa2fb80d203dd675c48f64 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Thu, 21 Jul 2022 15:38:55 +0200
Subject: [PATCH 09/32] virtio-net: Expose ctrl virtqueue logic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 108: Net Control Virtqueue shadow Support
RH-Commit: [9/27] c4ab1e35f4ca728df82a687763c662369282c513 (eperezmartin/qemu-kvm)
RH-Bugzilla: 1939363
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
Bugzilla: https://bugzilla.redhat.com/1939363
Upstream Status: git://git.qemu.org/qemu.git
commit 640b8a1c588b56349b3307d88459ea1cd86181fb
Author: Eugenio Pérez <eperezma@redhat.com>
Date: Wed Jul 20 08:59:28 2022 +0200
virtio-net: Expose ctrl virtqueue logic
This allows external vhost-net devices to modify the state of the
VirtIO device model once the vhost-vdpa device has acknowledged the
control commands.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
hw/net/virtio-net.c | 84 ++++++++++++++++++++--------------
include/hw/virtio/virtio-net.h | 4 ++
2 files changed, 53 insertions(+), 35 deletions(-)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 2a127f0a3b..59bedba681 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1433,57 +1433,71 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
return VIRTIO_NET_OK;
}
-static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
+size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
+ const struct iovec *in_sg, unsigned in_num,
+ const struct iovec *out_sg,
+ unsigned out_num)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_ctrl_hdr ctrl;
virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
- VirtQueueElement *elem;
size_t s;
struct iovec *iov, *iov2;
- unsigned int iov_cnt;
+
+ if (iov_size(in_sg, in_num) < sizeof(status) ||
+ iov_size(out_sg, out_num) < sizeof(ctrl)) {
+ virtio_error(vdev, "virtio-net ctrl missing headers");
+ return 0;
+ }
+
+ iov2 = iov = g_memdup2(out_sg, sizeof(struct iovec) * out_num);
+ s = iov_to_buf(iov, out_num, 0, &ctrl, sizeof(ctrl));
+ iov_discard_front(&iov, &out_num, sizeof(ctrl));
+ if (s != sizeof(ctrl)) {
+ status = VIRTIO_NET_ERR;
+ } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
+ status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, out_num);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
+ status = virtio_net_handle_mac(n, ctrl.cmd, iov, out_num);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
+ status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, out_num);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
+ status = virtio_net_handle_announce(n, ctrl.cmd, iov, out_num);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
+ status = virtio_net_handle_mq(n, ctrl.cmd, iov, out_num);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
+ status = virtio_net_handle_offloads(n, ctrl.cmd, iov, out_num);
+ }
+
+ s = iov_from_buf(in_sg, in_num, 0, &status, sizeof(status));
+ assert(s == sizeof(status));
+
+ g_free(iov2);
+ return sizeof(status);
+}
+
+static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtQueueElement *elem;
for (;;) {
+ size_t written;
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
if (!elem) {
break;
}
- if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
- iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
- virtio_error(vdev, "virtio-net ctrl missing headers");
+
+ written = virtio_net_handle_ctrl_iov(vdev, elem->in_sg, elem->in_num,
+ elem->out_sg, elem->out_num);
+ if (written > 0) {
+ virtqueue_push(vq, elem, written);
+ virtio_notify(vdev, vq);
+ g_free(elem);
+ } else {
virtqueue_detach_element(vq, elem, 0);
g_free(elem);
break;
}
-
- iov_cnt = elem->out_num;
- iov2 = iov = g_memdup2(elem->out_sg,
- sizeof(struct iovec) * elem->out_num);
- s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
- iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
- if (s != sizeof(ctrl)) {
- status = VIRTIO_NET_ERR;
- } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
- status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
- } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
- status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
- } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
- status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
- } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
- status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
- } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
- status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
- } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
- status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
- }
-
- s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
- assert(s == sizeof(status));
-
- virtqueue_push(vq, elem, sizeof(status));
- virtio_notify(vdev, vq);
- g_free(iov2);
- g_free(elem);
}
}
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index cce1c554f7..ef234ffe7e 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -221,6 +221,10 @@ struct VirtIONet {
struct EBPFRSSContext ebpf_rss;
};
+size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
+ const struct iovec *in_sg, unsigned in_num,
+ const struct iovec *out_sg,
+ unsigned out_num);
void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
const char *type);
--
2.31.1
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