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net: List available netdevs with "-netdev help" 

Other options like "-chardev" or "-device" feature a nice help text
with the available devices when being called with "help" or "?".
Since it is quite useful, especially if you want to see which network
backends have been compiled into the QEMU binary, let's provide such
a help text for "-netdev", too.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Thomas Huth 2018-02-21 11:18:31 +01:00 committed by Jason Wang
parent 34f708b0b6
commit 547203ead4
1 changed files with 36 additions and 1 deletions
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37
net/net.c
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@ -1086,6 +1086,38 @@ static int net_client_init1(const void *object, bool is_netdev, Error **errp)
return 0;
}
static void show_netdevs(void)
{
int idx;
const char *available_netdevs[] = {
"socket",
"hubport",
"tap",
#ifdef CONFIG_SLIRP
"user",
#endif
#ifdef CONFIG_L2TPV3
"l2tpv3",
#endif
#ifdef CONFIG_VDE
"vde",
#endif
#ifdef CONFIG_NET_BRIDGE
"bridge",
#endif
#ifdef CONFIG_NETMAP
"netmap",
#endif
#ifdef CONFIG_POSIX
"vhost-user",
#endif
};
printf("Available netdev backend types:\n");
for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
puts(available_netdevs[idx]);
}
}
int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
{
@ -1094,7 +1126,10 @@ int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
int ret = -1;
Visitor *v = opts_visitor_new(opts);
{
if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) {
show_netdevs();
exit(0);
} else {
/* Parse convenience option format ip6-net=fec0::0[/64] */
const char *ip6_net = qemu_opt_get(opts, "ipv6-net");