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xen-netback: add reference from xenvif to backend_info to facilitate coredump analysis

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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>
This commit is contained in:
Dongli Zhang
2019-04-12 14:53:24 +08:00
committed by David S. Miller
parent 8af9f7291e
commit 6dc400af21
2 changed files with 19 additions and 16 deletions
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18
drivers/net/xen-netback/common.h
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@@ -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