From f68b9d672b90dedc79aeb9b44607f484dbe46a6b Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 22 Mar 2011 18:39:40 +0000 Subject: net: Improve the warnings for dubious command line option combinations Improve the warnings we give if the user specified a combination of -net options which don't make much sense: * Don't warn about anything if the config is the implicit default "-net user -net nic" rather than one specified by the user (this will only kick in for boards with no NIC or if CONFIG_SLIRP is not set) * Diagnose the case where the user asked for NICs which the board didn't instantiate (for example where the user asked for two NICs but the board only supports one) Signed-off-by: Peter Maydell Signed-off-by: Aurelien Jarno --- net.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'net.c') diff --git a/net.c b/net.c index b2dfaa8..8d6a555 100644 --- a/net.c +++ b/net.c @@ -1305,6 +1305,22 @@ void net_check_clients(void) { VLANState *vlan; VLANClientState *vc; + int seen_nics = 0; + + /* Don't warn about the default network setup that you get if + * no command line -net options are specified. There are two + * cases that we would otherwise complain about: + * (1) board doesn't support a NIC but the implicit "-net nic" + * requested one; we'd otherwise complain about more NICs being + * specified than we support, and also that the vlan set up by + * the implicit "-net user" didn't have any NICs connected to it + * (2) CONFIG_SLIRP not set: we'd otherwise complain about the + * implicit "-net nic" setting up a nic that wasn't connected to + * anything. + */ + if (default_net) { + return; + } QTAILQ_FOREACH(vlan, &vlans, next) { int has_nic = 0, has_host_dev = 0; @@ -1312,6 +1328,7 @@ void net_check_clients(void) QTAILQ_FOREACH(vc, &vlan->clients, next) { switch (vc->info->type) { case NET_CLIENT_TYPE_NIC: + seen_nics++; has_nic = 1; break; case NET_CLIENT_TYPE_SLIRP: @@ -1331,12 +1348,26 @@ void net_check_clients(void) vlan->id); } QTAILQ_FOREACH(vc, &non_vlan_clients, next) { + if (vc->info->type == NET_CLIENT_TYPE_NIC) { + seen_nics++; + } if (!vc->peer) { fprintf(stderr, "Warning: %s %s has no peer\n", vc->info->type == NET_CLIENT_TYPE_NIC ? "nic" : "netdev", vc->name); } } + if (seen_nics != nb_nics) { + /* Number of NICs requested by user on command line doesn't match + * the number the model actually registered with us. + * This will generally only happen for models of embedded boards + * with no PCI bus or similar. PCI based machines can instantiate + * all requested NICs as PCI devices but usually embedded boards + * only have a single NIC. + */ + fprintf(stderr, "Warning: more nics requested than this machine " + "supports; some have been ignored\n"); + } } static int net_init_client(QemuOpts *opts, void *dummy) -- cgit v1.1