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authorDongli Zhang <dongli.zhang@oracle.com>2019-04-12 09:53:24 +0300
committerDavid S. Miller <davem@davemloft.net>2019-04-12 20:10:28 +0300
commit6dc400af216a79c10cb082f25a7337bcbf532045 (patch)
tree26989f2a1ffae70d912a5f017767bd94066cd117 /drivers/net/xen-netback
parent8af9f7291e22d165ea630856da4171a9d5a6ced3 (diff)
downloadlinux-6dc400af216a79c10cb082f25a7337bcbf532045.tar.xz
xen-netback: add reference from xenvif to backend_info to facilitate coredump analysis
During coredump analysis, it is not easy to obtain the address of backend_info in xen-netback. So far there are two ways to obtain backend_info: 1. Do what xenbus_device_find() does for vmcore to find the xenbus_device and then derive it from dev_get_drvdata(). 2. Extract backend_info from callstack of xenwatch (e.g., netback_remove() or frontend_changed()). This patch adds a reference from xenvif to backend_info so that it would be much more easier to obtain backend_info during coredump analysis. Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r--drivers/net/xen-netback/common.h18
-rw-r--r--drivers/net/xen-netback/xenbus.c17
2 files changed, 19 insertions, 16 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 936c0b3e0ba2..05847eb91a1b 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -248,6 +248,22 @@ struct xenvif_hash {
struct xenvif_hash_cache cache;
};
+struct backend_info {
+ struct xenbus_device *dev;
+ struct xenvif *vif;
+
+ /* This is the state that will be reflected in xenstore when any
+ * active hotplug script completes.
+ */
+ enum xenbus_state state;
+
+ enum xenbus_state frontend_state;
+ struct xenbus_watch hotplug_status_watch;
+ u8 have_hotplug_status_watch:1;
+
+ const char *hotplug_script;
+};
+
struct xenvif {
/* Unique identifier for this interface. */
domid_t domid;
@@ -283,6 +299,8 @@ struct xenvif {
struct xenbus_watch credit_watch;
struct xenbus_watch mcast_ctrl_watch;
+ struct backend_info *be;
+
spinlock_t lock;
#ifdef CONFIG_DEBUG_FS
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 330ddb64930f..41c9e8f2e520 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -22,22 +22,6 @@
#include <linux/vmalloc.h>
#include <linux/rtnetlink.h>
-struct backend_info {
- struct xenbus_device *dev;
- struct xenvif *vif;
-
- /* This is the state that will be reflected in xenstore when any
- * active hotplug script completes.
- */
- enum xenbus_state state;
-
- enum xenbus_state frontend_state;
- struct xenbus_watch hotplug_status_watch;
- u8 have_hotplug_status_watch:1;
-
- const char *hotplug_script;
-};
-
static int connect_data_rings(struct backend_info *be,
struct xenvif_queue *queue);
static void connect(struct backend_info *be);
@@ -472,6 +456,7 @@ static int backend_create_xenvif(struct backend_info *be)
return err;
}
be->vif = vif;
+ vif->be = be;
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
return 0;