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[3/7] tap: forbid creating multiqueue tap when hub is used

Message ID 1361978545-13789-4-git-send-email-stefanha@redhat.com
State New
Headers show

Commit Message

Stefan Hajnoczi Feb. 27, 2013, 3:22 p.m. UTC 
From: Jason Wang <jasowang@redhat.com>

Obviously, hub does not support multiqueue tap. So this patch forbids creating
multiple queue tap when hub is used to prevent the crash when command line such
as "-net tap,queues=2" is used.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 net/tap.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/net/tap.c b/net/tap.c
index 48c254e..daab350 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -693,6 +693,13 @@  int net_init_tap(const NetClientOptions *opts, const char *name,
     queues = tap->has_queues ? tap->queues : 1;
     vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
 
+    /* QEMU vlans does not support multiqueue tap, in this case peer is set.
+     * For -netdev, peer is always NULL. */
+    if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
+        error_report("Multiqueue tap cannnot be used with QEMU vlans");
+        return -1;
+    }
+
     if (tap->has_fd) {
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
             tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||