From f68b9d672b90dedc79aeb9b44607f484dbe46a6b Mon Sep 17 00:00:00 2001
From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 22 Mar 2011 18:39:40 +0000
Subject: [PATCH] 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 <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
net.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/net.c b/net.c
index b2dfaa8085..8d6a555374 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)
--
2.30.2