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[Qemu-devel] [PATCH 1/4] Add 'set_link' monitor command
From: |
Mark McLoughlin |
Subject: |
[Qemu-devel] [PATCH 1/4] Add 'set_link' monitor command |
Date: |
Thu, 8 Jan 2009 18:37:47 +0000 |
Add a monitor command to setting a given network device's link status
to 'up' or 'down'.
Allows simulation of network cable disconnect.
Signed-off-by: Mark McLoughlin <address@hidden>
---
monitor.c | 1 +
net.c | 31 ++++++++++++++++++++++++++++++-
net.h | 2 ++
3 files changed, 33 insertions(+), 1 deletions(-)
diff --git a/monitor.c b/monitor.c
index 745c335..7ff9890 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1516,6 +1516,7 @@ static const term_cmd_t term_cmds[] = {
"value", "set maximum speed (in bytes) for migrations" },
{ "balloon", "i", do_balloon,
"target", "request VM to change it's memory allocation (in MB)" },
+ { "set_link", "ss", do_set_link, "name [up|down]" },
{ NULL, NULL, },
};
diff --git a/net.c b/net.c
index 4609be2..eef0564 100644
--- a/net.c
+++ b/net.c
@@ -386,12 +386,15 @@ void qemu_send_packet(VLANClientState *vc1, const uint8_t
*buf, int size)
VLANState *vlan = vc1->vlan;
VLANClientState *vc;
+ if (vc1->link_down)
+ return;
+
#ifdef DEBUG_NET
printf("vlan %d send:\n", vlan->id);
hex_dump(stdout, buf, size);
#endif
for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
- if (vc != vc1) {
+ if (vc != vc1 && !vc->link_down) {
vc->fd_read(vc->opaque, buf, size);
}
}
@@ -1717,6 +1720,32 @@ void do_info_network(void)
}
}
+int do_set_link(const char *name, const char *up_or_down)
+{
+ VLANState *vlan;
+ VLANClientState *vc = NULL;
+
+ for (vlan = first_vlan; vlan != NULL; vlan = vlan->next)
+ for (vc = vlan->first_client; vc != NULL; vc = vc->next)
+ if (strcmp(vc->name, name) == 0)
+ break;
+
+ if (!vc) {
+ term_printf("could not find network device '%s'", name);
+ return 0;
+ }
+
+ if (strcmp(up_or_down, "up") == 0)
+ vc->link_down = 0;
+ else if (strcmp(up_or_down, "down") == 0)
+ vc->link_down = 1;
+ else
+ term_printf("invalid link status '%s'; only 'up' or 'down' valid\n",
+ up_or_down);
+
+ return 1;
+}
+
void net_cleanup(void)
{
VLANState *vlan;
diff --git a/net.h b/net.h
index 19ab649..3c0dab9 100644
--- a/net.h
+++ b/net.h
@@ -15,6 +15,7 @@ struct VLANClientState {
/* Packets may still be sent if this returns zero. It's used to
rate-limit the slirp code. */
IOCanRWHandler *fd_can_read;
+ int link_down;
void *opaque;
struct VLANClientState *next;
struct VLANState *vlan;
@@ -49,6 +50,7 @@ void qemu_check_nic_model_list(NICInfo *nd, const char *
const *models,
void qemu_handler_true(void *opaque);
void do_info_network(void);
+int do_set_link(const char *name, const char *up_or_down);
/* NIC info */
--
1.6.0.6
- [Qemu-devel] [PATCH 1/4] Add 'set_link' monitor command,
Mark McLoughlin <=