From 10f8a115a862045a836932c5d519a848dda5d461 Mon Sep 17 00:00:00 2001 From: Kangjie Xu Date: Mon, 17 Oct 2022 17:25:53 +0800 Subject: [PATCH] vhost-net: vhost-kernel: introduce vhost_net_virtqueue_restart() Introduce vhost_net_virtqueue_restart(), which can restart the specific virtqueue when the vhost net started running before. If it fails to restart the virtqueue, the device will be stopped. Here we do not reuse vhost_net_start_one() or vhost_dev_start() because they work at queue pair level. The mem table and features do not change, so we can call the vhost_virtqueue_start() to restart a specific queue. This patch only considers the case of vhost-kernel, when NetClientDriver is NET_CLIENT_DRIVER_TAP. Signed-off-by: Kangjie Xu Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20221017092558.111082-11-xuanzhuo@linux.alibaba.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/net/vhost_net-stub.c | 6 +++++ hw/net/vhost_net.c | 53 +++++++++++++++++++++++++++++++++++++++++ include/net/vhost_net.h | 2 ++ 3 files changed, 61 insertions(+) diff --git a/hw/net/vhost_net-stub.c b/hw/net/vhost_net-stub.c index 2d745e359c7..9f7daae99c2 100644 --- a/hw/net/vhost_net-stub.c +++ b/hw/net/vhost_net-stub.c @@ -107,3 +107,9 @@ void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc, { } + +int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc, + int vq_index) +{ + return 0; +} diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index 8beecb4d222..d2926e2ed63 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -34,6 +34,7 @@ #include "standard-headers/linux/virtio_ring.h" #include "hw/virtio/vhost.h" #include "hw/virtio/virtio-bus.h" +#include "linux-headers/linux/vhost.h" /* Features supported by host kernel. */ @@ -556,3 +557,55 @@ void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc, net->dev.vqs + idx, net->dev.vq_index + idx); } + +int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc, + int vq_index) +{ + VHostNetState *net = get_vhost_net(nc->peer); + const VhostOps *vhost_ops = net->dev.vhost_ops; + struct vhost_vring_file file = { }; + int idx, r; + + if (!net->dev.started) { + return -EBUSY; + } + + /* should only be called after backend is connected */ + assert(vhost_ops); + + idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index); + + r = vhost_virtqueue_start(&net->dev, + vdev, + net->dev.vqs + idx, + net->dev.vq_index + idx); + if (r < 0) { + goto err_start; + } + + if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { + file.index = idx; + file.fd = net->backend; + r = vhost_net_set_backend(&net->dev, &file); + if (r < 0) { + r = -errno; + goto err_start; + } + } + + return 0; + +err_start: + error_report("Error when restarting the queue."); + + if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { + file.fd = VHOST_FILE_UNBIND; + file.index = idx; + int r = vhost_net_set_backend(&net->dev, &file); + assert(r >= 0); + } + + vhost_dev_stop(&net->dev, vdev); + + return r; +} diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h index 85d85a49577..40b9a400745 100644 --- a/include/net/vhost_net.h +++ b/include/net/vhost_net.h @@ -50,4 +50,6 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu); void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc, int vq_index); +int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc, + int vq_index); #endif -- 2.39.5