On Fri, Sep 23, 2022 at 11:33 AM 陈浩 <ch...@yusur.tech> wrote: > > > On 2022/9/22 17:56, Michael S. Tsirkin wrote: > > On Thu, Sep 22, 2022 at 09:34:41AM +0800, Jason Wang wrote: > >> On Thu, Sep 22, 2022 at 1:58 AM Raphael Norwitz > >> <raphael.norw...@nutanix.com> wrote: > >>> If I read your response on the other thread correctly, this change is > >>> intended > >>> > >>> to prioritize the MAC address exposed by DPDK over the one provided by the > >>> > >>> QEMU command line? Sounds reasonable in principle, but I would get > >>> confirmation > >>> > >>> from vDPA/vhost-net maintainers. > >> I think the best way is to (and it seems easier) > >> > >> 1) have the management layer to make sure the mac came from cli > >> matches the underlayer vDPA > >> 2) having a sanity check and fail the device initialization if they don't > >> match > >> > >> Thanks > > I think I agree, we should not overwrite user supplied arguments. > > I think the case where we might want to get the mac from VDPA > > and use it is when it's been assigned randomly as opposed to coming from > > cli. > Yes, when the cli passes in a random mac address that is inconsistent > with the vdpa device, qemu still starts the virtual machine as usual, > but in this case, the qemu and vdpa environments do not work correctly. > So I want to get mac address directly from vdpa device instead of cli.
Let's teach the management to do that. It has a lot of advantages, more below. Not sure for the DPDK case, but kernel vDPA allows the mgmt to provision the vDPA with a mac address which could be used in this case. > > Having a sanity check and fail the device initialization if they don't > match is a good idea, but it seems more convenient to directly overwrite > the cli mac address. This will confuse the management where it may do a lot of mac related setups. Thanks > > > > > >>> > >>> > >>> That said the way you’re hacking the vhost-user code breaks a valuable > >>> check for > >>> > >>> bad vhost-user-blk backends. I would suggest finding another > >>> implementation which > >>> > >>> does not regress functionality for other device types. > >>> > >>> > >>> > >>> > >>> > >>>> From: Hao Chen <ch...@yusur.tech> > >>>> When use dpdk-vdpa tests vdpa device. You need to specify the mac > >>>> address to > >>>> start the virtual machine through libvirt or qemu, but now, the libvirt > >>>> or > >>>> qemu can call dpdk vdpa vendor driver's ops .get_config through > >>>> vhost_net_get_config > >>>> to get the mac address of the vdpa hardware without manual configuration. > >>>> v1->v2: > >>>> Only copy ETH_ALEN data of netcfg for some vdpa device such as > >>>> NVIDIA BLUEFIELD DPU(BF2)'s netcfg->status is not right. > >>>> We only need the mac address and don't care about the status field. > >>>> Signed-off-by: Hao Chen <ch...@yusur.tech> > >>>> --- > >>>> hw/block/vhost-user-blk.c | 1 - > >>>> hw/net/virtio-net.c | 7 +++++++ > >>>> hw/virtio/vhost-user.c | 19 ------------------- > >>>> 3 files changed, 7 insertions(+), 20 deletions(-) > >>>> diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c > >>>> index 9117222456..5dca4eab09 100644 > >>>> --- a/hw/block/vhost-user-blk.c > >>>> +++ b/hw/block/vhost-user-blk.c > >>>> @@ -337,7 +337,6 @@ static int vhost_user_blk_connect(DeviceState *dev, > >>>> Error **errp) > >>>> vhost_dev_set_config_notifier(&s->dev, &blk_ops); > >>>> - s->vhost_user.supports_config = true; > >>>> ret = vhost_dev_init(&s->dev, &s->vhost_user, > >>>> VHOST_BACKEND_TYPE_USER, 0, > >>>> errp); > >>>> if (ret < 0) { > >>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c > >>>> index dd0d056fde..90405083b1 100644 > >>>> --- a/hw/net/virtio-net.c > >>>> +++ b/hw/net/virtio-net.c > >>>> @@ -166,6 +166,13 @@ static void virtio_net_get_config(VirtIODevice > >>>> *vdev, uint8_t *config) > >>>> } > >>>> memcpy(config, &netcfg, n->config_size); > >>>> } > >>>> + } else if (nc->peer && nc->peer->info->type == > >>>> NET_CLIENT_DRIVER_VHOST_USER) { > >>>> + ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t > >>>> *)&netcfg, > >>>> + n->config_size); > >>>> + if (ret != -1) { > >>>> + /* Automatically obtain the mac address of the vdpa > >>>> device > >>>> + * when using the dpdk vdpa */ > >>>> + memcpy(config, &netcfg, ETH_ALEN); > >>>> } > >>>> } > >>>> diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c > >>>> index bd24741be8..8b01078249 100644 > >>>> --- a/hw/virtio/vhost-user.c > >>>> +++ b/hw/virtio/vhost-user.c > >>>> @@ -2013,8 +2013,6 @@ static int vhost_user_backend_init(struct > >>>> vhost_dev *dev, void *opaque, > >>>> } > >>>> if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) { > >>>> - bool supports_f_config = vus->supports_config || > >>>> - (dev->config_ops && > >>>> dev->config_ops->vhost_dev_config_notifier); > >>>> uint64_t protocol_features; > >>>> dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; > >>>> @@ -2033,23 +2031,6 @@ static int vhost_user_backend_init(struct > >>>> vhost_dev *dev, void *opaque, > >>>> */ > >>>> protocol_features &= VHOST_USER_PROTOCOL_FEATURE_MASK; > >>>> - if (supports_f_config) { > >>>> - if (!virtio_has_feature(protocol_features, > >>>> - VHOST_USER_PROTOCOL_F_CONFIG)) { > >>>> - error_setg(errp, "vhost-user device expecting " > >>>> - "VHOST_USER_PROTOCOL_F_CONFIG but the > >>>> vhost-user backend does " > >>>> - "not support it."); > >>>> - return -EPROTO; > >>>> - } > >>>> - } else { > >>>> - if (virtio_has_feature(protocol_features, > >>>> - VHOST_USER_PROTOCOL_F_CONFIG)) { > >>>> - warn_reportf_err(*errp, "vhost-user backend supports " > >>>> - "VHOST_USER_PROTOCOL_F_CONFIG but QEMU > >>>> does not."); > >>>> - protocol_features &= ~(1ULL << > >>>> VHOST_USER_PROTOCOL_F_CONFIG); > >>>> - } > >>>> - } > >>>> - > >>>> /* final set of protocol features */ > >>>> dev->protocol_features = protocol_features; > >>>> err = vhost_user_set_protocol_features(dev, > >>>> dev->protocol_features); > >>>> -- > >>>> 2.27.0 > >>> > > >