summaryrefslogtreecommitdiffstats
path: root/include/linux/sunrpc
diff options
context:
space:
mode:
authorChuck Lever <chuck.lever@oracle.com>2015-05-11 14:02:25 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-06-10 18:37:26 -0400
commit4a06825839889cc1756d0dd8a52d6b1071ee0263 (patch)
treeca49cf2fe5a77018dc473a261f8a5c243530c761 /include/linux/sunrpc
parent11598b8ff2b97cf034d0c025cf125c92b574bafc (diff)
downloadop-kernel-dev-4a06825839889cc1756d0dd8a52d6b1071ee0263.zip
op-kernel-dev-4a06825839889cc1756d0dd8a52d6b1071ee0263.tar.gz
SUNRPC: Transport fault injection
It has been exceptionally useful to exercise the logic that handles local immediate errors and RDMA connection loss. To enable developers to test this regularly and repeatably, add logic to simulate connection loss every so often. Fault injection is disabled by default. It is enabled with $ sudo echo xxx > /sys/kernel/debug/sunrpc/inject_fault/disconnect where "xxx" is a large positive number of transport method calls before a disconnect. A value of several thousand is usually a good number that allows reasonable forward progress while still causing a lot of connection drops. These hooks are disabled when SUNRPC_DEBUG is turned off. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'include/linux/sunrpc')
-rw-r--r--include/linux/sunrpc/xprt.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index b609659..0fb9acb 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -135,6 +135,7 @@ struct rpc_xprt_ops {
void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
int (*enable_swap)(struct rpc_xprt *xprt);
void (*disable_swap)(struct rpc_xprt *xprt);
+ void (*inject_disconnect)(struct rpc_xprt *xprt);
};
/*
@@ -244,6 +245,7 @@ struct rpc_xprt {
const char *address_strings[RPC_DISPLAY_MAX];
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
struct dentry *debugfs; /* debugfs directory */
+ atomic_t inject_disconnect;
#endif
};
@@ -445,6 +447,23 @@ static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
return test_and_set_bit(XPRT_BINDING, &xprt->state);
}
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+extern unsigned int rpc_inject_disconnect;
+static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
+{
+ if (!rpc_inject_disconnect)
+ return;
+ if (atomic_dec_return(&xprt->inject_disconnect))
+ return;
+ atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
+ xprt->ops->inject_disconnect(xprt);
+}
+#else
+static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
+{
+}
+#endif
+
#endif /* __KERNEL__*/
#endif /* _LINUX_SUNRPC_XPRT_H */
OpenPOWER on IntegriCloud