[1/2] net: Improve layout of 'info network'

Improve the layout when listing non-vlan clients via 'info network'. The
result looks like this:

(qemu) info network
Devices not on any VLAN:
  orphan: net=10.0.2.0, restricted=n
  virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:56
   \ network2: fd=5
  e1000.0: model=e1000,macaddr=52:54:00:12:34:57
   \ network1: net=10.0.2.0, restricted=n
  rtl8139.0: model=rtl8139,macaddr=52:54:00:12:34:58

ie. peers are grouped, orphans are listed as before.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 net.c |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

Jan Kiszka <jan.kiszka@siemens.com> writes:

> Improve the layout when listing non-vlan clients via 'info network'. The
> result looks like this:
>
> (qemu) info network
> Devices not on any VLAN:
>   orphan: net=10.0.2.0, restricted=n
>   virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:56
>    \ network2: fd=5
>   e1000.0: model=e1000,macaddr=52:54:00:12:34:57
>    \ network1: net=10.0.2.0, restricted=n
>   rtl8139.0: model=rtl8139,macaddr=52:54:00:12:34:58
>
> ie. peers are grouped, orphans are listed as before.

Cute :)

> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>  net.c |   14 +++++++++-----
>  1 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/net.c b/net.c
> index 4f777c3..606ce70 100644
> --- a/net.c
> +++ b/net.c
> @@ -1224,7 +1224,8 @@ int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
>  void do_info_network(Monitor *mon)
>  {
>      VLANState *vlan;
> -    VLANClientState *vc;
> +    VLANClientState *vc, *peer;
> +    net_client_type type;
>  
>      QTAILQ_FOREACH(vlan, &vlans, next) {
>          monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
> @@ -1235,11 +1236,14 @@ void do_info_network(Monitor *mon)
>      }
>      monitor_printf(mon, "Devices not on any VLAN:\n");
>      QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
> -        monitor_printf(mon, "  %s: %s", vc->name, vc->info_str);
> -        if (vc->peer) {
> -            monitor_printf(mon, " peer=%s", vc->peer->name);
> +        peer = vc->peer;
> +        type = vc->info->type;
> +        if (!peer || type == NET_CLIENT_TYPE_NIC) {
> +            monitor_printf(mon, "  %s: %s\n", vc->name, vc->info_str);
> +        }
> +        if (peer && type == NET_CLIENT_TYPE_NIC) {
> +            monitor_printf(mon, "   \\ %s: %s\n", peer->name, peer->info_str);
>          }
> -        monitor_printf(mon, "\n");
>      }
>  }

Before: print all members of non_vlan_clients.  Show any peering with
"peer=ID".

After:

1. print any NIC and any non-NIC without a peer (first if)

2. print NIC's peer, if any (second if)

1+2 together cover all members.  Okay.  But not obvious to me.  Care to
explain n a comment?  Perhaps something like:

        if (!peer || type == NET_CLIENT_TYPE_NIC) {
            monitor_printf(mon, "  %s: %s\n", vc->name, vc->info_str);
        } /* else it's a netdev connected to a NIC, printed with the NIC */
        if (peer && type == NET_CLIENT_TYPE_NIC) {
            monitor_printf(mon, "   \\ %s: %s\n", peer->name, peer->info_str);
        }