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SUNRPC: Transport fault injection

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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>
This commit is contained in:
Chuck Lever
2015-05-11 14:02:25 -04:00
committed by Trond Myklebust
parent 11598b8ff2
commit 4a06825839
6 changed files with 120 additions and 0 deletions
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10
net/sunrpc/xprtsock.c
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@@ -866,6 +866,13 @@ static void xs_close(struct rpc_xprt *xprt)
xprt_disconnect_done(xprt);
}
static void xs_inject_disconnect(struct rpc_xprt *xprt)
{
dprintk("RPC: injecting transport disconnect on xprt=%p\n",
xprt);
xprt_disconnect_done(xprt);
}
static void xs_xprt_free(struct rpc_xprt *xprt)
{
xs_free_peer_addresses(xprt);
@@ -2522,6 +2529,7 @@ static struct rpc_xprt_ops xs_udp_ops = {
.print_stats = xs_udp_print_stats,
.enable_swap = xs_enable_swap,
.disable_swap = xs_disable_swap,
.inject_disconnect = xs_inject_disconnect,
};
static struct rpc_xprt_ops xs_tcp_ops = {
@@ -2540,6 +2548,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
.print_stats = xs_tcp_print_stats,
.enable_swap = xs_enable_swap,
.disable_swap = xs_disable_swap,
.inject_disconnect = xs_inject_disconnect,
};
/*
@@ -2559,6 +2568,7 @@ static struct rpc_xprt_ops bc_tcp_ops = {
.print_stats = xs_tcp_print_stats,
.enable_swap = xs_enable_swap,
.disable_swap = xs_disable_swap,
.inject_disconnect = xs_inject_disconnect,
};
static int xs_init_anyaddr(const int family, struct sockaddr *sap)