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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] libxl: call hotplug scripts for nic devices from libxl
# HG changeset patch
# User Roger Pau Monne <roger.pau@xxxxxxxxxx>
# Date 1343317655 -3600
# Node ID 112ad131dca825a87903e60a3da7c022b9805cc6
# Parent 24dac62c0458bee85a8b7398c4c47094f503acb1
libxl: call hotplug scripts for nic devices from libxl
Since most of the needed work is already done in previous patches,
this patch only contains the necessary code to call hotplug scripts
for nic devices, that should be called when the device is added or
removed from a guest.
Added another parameter to libxl__get_hotplug_script_info, that is
used to know the number of times hotplug scripts have been called for
that device. This is currently used by IOEMU nics on Linux.
Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxx>
Acked-by: Ian Jackson<ian.jackson@xxxxxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
diff -r 24dac62c0458 -r 112ad131dca8 tools/hotplug/Linux/xen-backend.rules
--- a/tools/hotplug/Linux/xen-backend.rules Thu Jul 26 16:47:34 2012 +0100
+++ b/tools/hotplug/Linux/xen-backend.rules Thu Jul 26 16:47:35 2012 +0100
@@ -2,8 +2,8 @@ SUBSYSTEM=="xen-backend", KERNEL=="tap*"
SUBSYSTEM=="xen-backend", KERNEL=="vbd*", ENV{UDEV_CALL}="1",
RUN+="/etc/xen/scripts/block $env{ACTION}"
SUBSYSTEM=="xen-backend", KERNEL=="vtpm*", RUN+="/etc/xen/scripts/vtpm
$env{ACTION}"
SUBSYSTEM=="xen-backend", KERNEL=="vif2-*", RUN+="/etc/xen/scripts/vif2
$env{ACTION}"
-SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="online",
RUN+="/etc/xen/scripts/vif-setup online type_if=vif"
-SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="offline",
RUN+="/etc/xen/scripts/vif-setup offline type_if=vif"
+SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ENV{UDEV_CALL}="1",
ACTION=="online", RUN+="/etc/xen/scripts/vif-setup online type_if=vif"
+SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ENV{UDEV_CALL}="1",
ACTION=="offline", RUN+="/etc/xen/scripts/vif-setup offline type_if=vif"
SUBSYSTEM=="xen-backend", KERNEL=="vscsi*", RUN+="/etc/xen/scripts/vscsi
$env{ACTION}"
SUBSYSTEM=="xen-backend", ACTION=="remove", ENV{UDEV_CALL}="1",
RUN+="/etc/xen/scripts/xen-hotplug-cleanup"
KERNEL=="evtchn", NAME="xen/%k"
@@ -13,4 +13,4 @@ KERNEL=="blktap-control", NAME="xen/blkt
KERNEL=="gntdev", NAME="xen/%k", MODE="0600"
KERNEL=="pci_iomul", NAME="xen/%k", MODE="0600"
KERNEL=="tapdev[a-z]*", NAME="xen/blktap-2/tapdev%m", MODE="0600"
-SUBSYSTEM=="net", KERNEL=="vif*-emu", ACTION=="add",
RUN+="/etc/xen/scripts/vif-setup $env{ACTION} type_if=tap"
+SUBSYSTEM=="net", KERNEL=="vif*-emu", ACTION=="add", ENV{UDEV_CALL}="1",
RUN+="/etc/xen/scripts/vif-setup $env{ACTION} type_if=tap"
diff -r 24dac62c0458 -r 112ad131dca8 tools/libxl/libxl_device.c
--- a/tools/libxl/libxl_device.c Thu Jul 26 16:47:34 2012 +0100
+++ b/tools/libxl/libxl_device.c Thu Jul 26 16:47:35 2012 +0100
@@ -102,6 +102,31 @@ out:
return numdevs;
}
+int libxl__nic_type(libxl__gc *gc, libxl__device *dev, libxl_nic_type *nictype)
+{
+ char *snictype, *be_path;
+ int rc = 0;
+
+ be_path = libxl__device_backend_path(gc, dev);
+ snictype = libxl__xs_read(gc, XBT_NULL,
+ GCSPRINTF("%s/%s", be_path, "type"));
+ if (!snictype) {
+ LOGE(ERROR, "unable to read nictype from %s", be_path);
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ rc = libxl_nic_type_from_string(snictype, nictype);
+ if (rc) {
+ LOGE(ERROR, "unable to parse nictype from %s", be_path);
+ goto out;
+ }
+
+ rc = 0;
+
+out:
+ return rc;
+}
+
int libxl__device_generic_add(libxl__gc *gc, xs_transaction_t t,
libxl__device *device, char **bents, char **fents)
{
@@ -638,6 +663,8 @@ static void device_hotplug_child_death_c
static void device_hotplug_done(libxl__egc *egc, libxl__ao_device *aodev);
+static void device_hotplug_clean(libxl__gc *gc, libxl__ao_device *aodev);
+
void libxl__wait_device_connection(libxl__egc *egc, libxl__ao_device *aodev)
{
STATE_AO_GC(aodev->ao);
@@ -850,7 +877,8 @@ static void device_hotplug(libxl__egc *e
/* Check if we have to execute hotplug scripts for this device
* and return the necessary args/env vars for execution */
hotplug = libxl__get_hotplug_script_info(gc, aodev->dev, &args, &env,
- aodev->action);
+ aodev->action,
+ aodev->num_exec);
switch (hotplug) {
case 0:
/* no hotplug script to execute */
@@ -930,6 +958,8 @@ static void device_hotplug_child_death_c
char *be_path = libxl__device_backend_path(gc, aodev->dev);
char *hotplug_error;
+ device_hotplug_clean(gc, aodev);
+
if (status) {
libxl_report_child_exitstatus(CTX, LIBXL__LOG_ERROR,
aodev->what, pid, status);
@@ -938,8 +968,25 @@ static void device_hotplug_child_death_c
if (hotplug_error)
LOG(ERROR, "script: %s", hotplug_error);
aodev->rc = ERROR_FAIL;
+ if (aodev->action == DEVICE_CONNECT)
+ /*
+ * Only fail on device connection, on disconnection
+ * ignore error, and continue with the remove process
+ */
+ goto error;
}
+ /* Increase num_exec and call hotplug scripts again if necessary
+ * If no more executions are needed, device_hotplug will call
+ * device_hotplug_done breaking the loop.
+ */
+ aodev->num_exec++;
+ device_hotplug(egc, aodev);
+
+ return;
+
+error:
+ assert(aodev->rc);
device_hotplug_done(egc, aodev);
}
@@ -951,9 +998,7 @@ static void device_hotplug_done(libxl__e
xs_transaction_t t = 0;
int rc;
- /* Clean events and check reentrancy */
- libxl__ev_time_deregister(gc, &aodev->timeout);
- assert(!libxl__ev_child_inuse(&aodev->child));
+ device_hotplug_clean(gc, aodev);
/* Clean xenstore if it's a disconnection */
if (aodev->action == DEVICE_DISCONNECT) {
@@ -975,6 +1020,13 @@ out:
return;
}
+static void device_hotplug_clean(libxl__gc *gc, libxl__ao_device *aodev)
+{
+ /* Clean events and check reentrancy */
+ libxl__ev_time_deregister(gc, &aodev->timeout);
+ assert(!libxl__ev_child_inuse(&aodev->child));
+}
+
static void devices_remove_callback(libxl__egc *egc, libxl__ao_devices *aodevs,
int rc)
{
diff -r 24dac62c0458 -r 112ad131dca8 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Thu Jul 26 16:47:34 2012 +0100
+++ b/tools/libxl/libxl_internal.h Thu Jul 26 16:47:35 2012 +0100
@@ -920,6 +920,8 @@ _hidden int libxl__parse_backend_path(li
libxl__device *dev);
_hidden int libxl__device_destroy(libxl__gc *gc, libxl__device *dev);
_hidden int libxl__wait_for_backend(libxl__gc *gc, char *be_path, char *state);
+_hidden int libxl__nic_type(libxl__gc *gc, libxl__device *dev,
+ libxl_nic_type *nictype);
/*
* For each aggregate type which can be used as an input we provide:
@@ -1840,6 +1842,7 @@ struct libxl__ao_device {
libxl__ao_devices *aodevs;
/* device hotplug execution */
const char *what;
+ int num_exec;
libxl__ev_child child;
};
@@ -1979,10 +1982,19 @@ _hidden void libxl__initiate_device_remo
* < 0: Error
* 0: No need to execute hotplug script
* 1: Execute hotplug script
+ *
+ * The last parameter, "num_exec" refeers to the number of times hotplug
+ * scripts have been called for this device.
+ *
+ * The main body of libxl will, for each device, keep calling
+ * libxl__get_hotplug_script_info, with incrementing values of
+ * num_exec, and executing the resulting script accordingly,
+ * until libxl__get_hotplug_script_info returns<=0.
*/
_hidden int libxl__get_hotplug_script_info(libxl__gc *gc, libxl__device *dev,
char ***args, char ***env,
- libxl__device_action action);
+ libxl__device_action action,
+ int num_exec);
/*----- local disk attach: attach a disk locally to run the bootloader -----*/
diff -r 24dac62c0458 -r 112ad131dca8 tools/libxl/libxl_linux.c
--- a/tools/libxl/libxl_linux.c Thu Jul 26 16:47:34 2012 +0100
+++ b/tools/libxl/libxl_linux.c Thu Jul 26 16:47:35 2012 +0100
@@ -87,6 +87,7 @@ static char **get_hotplug_env(libxl__gc
const char *type = libxl__device_kind_to_string(dev->backend_kind);
char **env;
int nr = 0;
+ libxl_nic_type nictype;
script = libxl__xs_read(gc, XBT_NULL,
GCSPRINTF("%s/%s", be_path, "script"));
@@ -95,24 +96,106 @@ static char **get_hotplug_env(libxl__gc
return NULL;
}
- const int arraysize = 9;
+ const int arraysize = 13;
GCNEW_ARRAY(env, arraysize);
env[nr++] = "script";
env[nr++] = script;
env[nr++] = "XENBUS_TYPE";
- env[nr++] = libxl__strdup(gc, type);
+ env[nr++] = (char *) type;
env[nr++] = "XENBUS_PATH";
env[nr++] = GCSPRINTF("backend/%s/%u/%d", type, dev->domid, dev->devid);
env[nr++] = "XENBUS_BASE_PATH";
env[nr++] = "backend";
+ if (dev->backend_kind == LIBXL__DEVICE_KIND_VIF) {
+ if (libxl__nic_type(gc, dev, &nictype)) {
+ LOG(ERROR, "unable to get nictype");
+ return NULL;
+ }
+ switch (nictype) {
+ case LIBXL_NIC_TYPE_VIF_IOEMU:
+ env[nr++] = "INTERFACE";
+ env[nr++] = (char *) libxl__device_nic_devname(gc, dev->domid,
+ dev->devid,
+ LIBXL_NIC_TYPE_VIF_IOEMU);
+ /*
+ * We need to fall through because for PV_IOEMU nic types we need
+ * to execute both the vif and the tap hotplug script, and we
+ * don't know which one we are executing in this call, so provide
+ * both env variables.
+ */
+ case LIBXL_NIC_TYPE_VIF:
+ env[nr++] = "vif";
+ env[nr++] = (char *) libxl__device_nic_devname(gc, dev->domid,
+ dev->devid,
+ LIBXL_NIC_TYPE_VIF);
+ break;
+ default:
+ return NULL;
+ }
+ }
+
env[nr++] = NULL;
- assert(nr == arraysize);
+ assert(nr <= arraysize);
return env;
}
/* Hotplug scripts caller functions */
+static int libxl__hotplug_nic(libxl__gc *gc, libxl__device *dev,
+ char ***args, char ***env,
+ libxl__device_action action, int num_exec)
+{
+ char *be_path = libxl__device_backend_path(gc, dev);
+ char *script;
+ int nr = 0, rc = 0;
+ libxl_nic_type nictype;
+
+ script = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/%s", be_path,
+ "script"));
+ if (!script) {
+ LOGE(ERROR, "unable to read script from %s", be_path);
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ rc = libxl__nic_type(gc, dev, &nictype);
+ if (rc) {
+ LOG(ERROR, "error when fetching nic type");
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ if (nictype == LIBXL_NIC_TYPE_VIF && num_exec != 0) {
+ rc = 0;
+ goto out;
+ }
+
+ *env = get_hotplug_env(gc, dev);
+ if (!env) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ const int arraysize = 4;
+ GCNEW_ARRAY(*args, arraysize);
+ (*args)[nr++] = script;
+
+ if (nictype == LIBXL_NIC_TYPE_VIF_IOEMU && num_exec) {
+ (*args)[nr++] = action == DEVICE_CONNECT ? "add" : "remove";
+ (*args)[nr++] = "type_if=tap";
+ (*args)[nr++] = NULL;
+ } else {
+ (*args)[nr++] = action == DEVICE_CONNECT ? "online" : "offline";
+ (*args)[nr++] = "type_if=vif";
+ (*args)[nr++] = NULL;
+ }
+ assert(nr == arraysize);
+ rc = 1;
+
+out:
+ return rc;
+}
+
static int libxl__hotplug_disk(libxl__gc *gc, libxl__device *dev,
char ***args, char ***env,
libxl__device_action action)
@@ -150,7 +233,8 @@ error:
int libxl__get_hotplug_script_info(libxl__gc *gc, libxl__device *dev,
char ***args, char ***env,
- libxl__device_action action)
+ libxl__device_action action,
+ int num_exec)
{
char *disable_udev = libxl__xs_read(gc, XBT_NULL, DISABLE_UDEV_PATH);
int rc;
@@ -163,8 +247,24 @@ int libxl__get_hotplug_script_info(libxl
switch (dev->backend_kind) {
case LIBXL__DEVICE_KIND_VBD:
+ if (num_exec != 0) {
+ rc = 0;
+ goto out;
+ }
rc = libxl__hotplug_disk(gc, dev, args, env, action);
break;
+ case LIBXL__DEVICE_KIND_VIF:
+ /*
+ * If domain has a stubdom we don't have to execute hotplug scripts
+ * for emulated interfaces
+ */
+ if ((num_exec > 1) ||
+ (libxl_get_stubdom_id(CTX, dev->domid) && num_exec)) {
+ rc = 0;
+ goto out;
+ }
+ rc = libxl__hotplug_nic(gc, dev, args, env, action, num_exec);
+ break;
default:
/* No need to execute any hotplug scripts */
rc = 0;
diff -r 24dac62c0458 -r 112ad131dca8 tools/libxl/libxl_netbsd.c
--- a/tools/libxl/libxl_netbsd.c Thu Jul 26 16:47:34 2012 +0100
+++ b/tools/libxl/libxl_netbsd.c Thu Jul 26 16:47:35 2012 +0100
@@ -34,7 +34,8 @@ char *libxl__devid_to_localdev(libxl__gc
/* Hotplug scripts caller functions */
int libxl__get_hotplug_script_info(libxl__gc *gc, libxl__device *dev,
char ***args, char ***env,
- libxl__device_action action)
+ libxl__device_action action,
+ int num_exec)
{
return 0;
}
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