Re: [PATCH v3 6/7] vhost_net: Add NetClientInfo prepare callback

[Jason Wang]

在 2022/8/4 01:18, Eugenio Pérez 写道:
> This is used by the backend to perform actions before the device is
> started.
>
> In particular, vdpa will use it to isolate CVQ in its own ASID if
> possible, and start SVQ unconditionally only in CVQ.
>
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> ---
>   include/net/net.h  | 2 ++
>   hw/net/vhost_net.c | 4 ++++
>   2 files changed, 6 insertions(+)
>
> diff --git a/include/net/net.h b/include/net/net.h
> index a8d47309cd..efa6448886 100644
> --- a/include/net/net.h
> +++ b/include/net/net.h
> @@ -44,6 +44,7 @@ typedef struct NICConf {
>   
>   typedef void (NetPoll)(NetClientState *, bool enable);
>   typedef bool (NetCanReceive)(NetClientState *);
> +typedef void (NetPrepare)(NetClientState *);
>   typedef int (NetLoad)(NetClientState *);
>   typedef ssize_t (NetReceive)(NetClientState *, const uint8_t *, size_t);
>   typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
> @@ -72,6 +73,7 @@ typedef struct NetClientInfo {
>       NetReceive *receive_raw;
>       NetReceiveIOV *receive_iov;
>       NetCanReceive *can_receive;
> +    NetPrepare *prepare;
>       NetLoad *load;
>       NetCleanup *cleanup;
>       LinkStatusChanged *link_status_changed;
> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> index a9bf72dcda..bbbb6d759b 100644
> --- a/hw/net/vhost_net.c
> +++ b/hw/net/vhost_net.c
> @@ -244,6 +244,10 @@ static int vhost_net_start_one(struct vhost_net *net,
>       struct vhost_vring_file file = { };
>       int r;
>   
> +    if (net->nc->info->prepare) {
> +        net->nc->info->prepare(net->nc);
> +    }


Any chance we can reuse load()?

Thanks


> +
>       r = vhost_dev_enable_notifiers(&net->dev, dev);
>       if (r < 0) {
>           goto fail_notifiers;