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xprtrdma: Modernize ops->connect 

Adapt and apply changes that were made to the TCP socket connect
code. See the following commits for details on the purpose of
these changes:

Commit 7196dbb02e ("SUNRPC: Allow changing of the TCP timeout parameters on the fly")
Commit 3851f1cdb2 ("SUNRPC: Limit the reconnect backoff timer to the max RPC message timeout")
Commit 02910177ae ("SUNRPC: Fix reconnection timeouts")

Some common transport code is moved to xprt.c to satisfy the code
duplication police.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2019-06-19 10:33:42 -04:00 committed by Anna Schumaker
parent 5828cebad1
commit 675dd90ad0
7 changed files with 121 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/sunrpc/xprt.h
View File

@ -334,6 +334,9 @@ struct xprt_class {
*/
struct rpc_xprt *xprt_create_transport(struct xprt_create *args);
void xprt_connect(struct rpc_task *task);
unsigned long xprt_reconnect_delay(const struct rpc_xprt *xprt);
void xprt_reconnect_backoff(struct rpc_xprt *xprt,
unsigned long init_to);
void xprt_reserve(struct rpc_task *task);
void xprt_retry_reserve(struct rpc_task *task);
int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);

31
include/trace/events/rpcrdma.h
View File

@ -375,6 +375,37 @@ DEFINE_RXPRT_EVENT(xprtrdma_op_inject_dsc);
DEFINE_RXPRT_EVENT(xprtrdma_op_close);
DEFINE_RXPRT_EVENT(xprtrdma_op_connect);
TRACE_EVENT(xprtrdma_op_set_cto,
TP_PROTO(
const struct rpcrdma_xprt *r_xprt,
unsigned long connect,
unsigned long reconnect
),
TP_ARGS(r_xprt, connect, reconnect),
TP_STRUCT__entry(
__field(const void *, r_xprt)
__field(unsigned long, connect)
__field(unsigned long, reconnect)
__string(addr, rpcrdma_addrstr(r_xprt))
__string(port, rpcrdma_portstr(r_xprt))
),
TP_fast_assign(
__entry->r_xprt = r_xprt;
__entry->connect = connect;
__entry->reconnect = reconnect;
__assign_str(addr, rpcrdma_addrstr(r_xprt));
__assign_str(port, rpcrdma_portstr(r_xprt));
),
TP_printk("peer=[%s]:%s r_xprt=%p: connect=%lu reconnect=%lu",
__get_str(addr), __get_str(port), __entry->r_xprt,
__entry->connect / HZ, __entry->reconnect / HZ
)
);
TRACE_EVENT(xprtrdma_qp_event,
TP_PROTO(
const struct rpcrdma_xprt *r_xprt,

1
net/sunrpc/sched.c
View File

@ -58,6 +58,7 @@ static struct rpc_wait_queue delay_queue;
*/
struct workqueue_struct *rpciod_workqueue __read_mostly;
struct workqueue_struct *xprtiod_workqueue __read_mostly;
EXPORT_SYMBOL_GPL(xprtiod_workqueue);
unsigned long
rpc_task_timeout(const struct rpc_task *task)

32
net/sunrpc/xprt.c
View File

@ -850,6 +850,38 @@ void xprt_connect(struct rpc_task *task)
xprt_release_write(xprt, task);
}
/**
* xprt_reconnect_delay - compute the wait before scheduling a connect
* @xprt: transport instance
*
*/
unsigned long xprt_reconnect_delay(const struct rpc_xprt *xprt)
{
unsigned long start, now = jiffies;
start = xprt->stat.connect_start + xprt->reestablish_timeout;
if (time_after(start, now))
return start - now;
return 0;
}
EXPORT_SYMBOL_GPL(xprt_reconnect_delay);
/**
* xprt_reconnect_backoff - compute the new re-establish timeout
* @xprt: transport instance
* @init_to: initial reestablish timeout
*
*/
void xprt_reconnect_backoff(struct rpc_xprt *xprt, unsigned long init_to)
{
xprt->reestablish_timeout <<= 1;
if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
xprt->reestablish_timeout = xprt->max_reconnect_timeout;
if (xprt->reestablish_timeout < init_to)
xprt->reestablish_timeout = init_to;
}
EXPORT_SYMBOL_GPL(xprt_reconnect_backoff);
enum xprt_xid_rb_cmp {
XID_RB_EQUAL,
XID_RB_LEFT,

66
net/sunrpc/xprtrdma/transport.c
View File

@ -298,6 +298,7 @@ xprt_rdma_destroy(struct rpc_xprt *xprt)
module_put(THIS_MODULE);
}
/* 60 second timeout, no retries */
static const struct rpc_timeout xprt_rdma_default_timeout = {
.to_initval = 60 * HZ,
.to_maxval = 60 * HZ,
@ -323,8 +324,9 @@ xprt_setup_rdma(struct xprt_create *args)
if (!xprt)
return ERR_PTR(-ENOMEM);
/* 60 second timeout, no retries */
xprt->timeout = &xprt_rdma_default_timeout;
xprt->connect_timeout = xprt->timeout->to_initval;
xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
xprt->bind_timeout = RPCRDMA_BIND_TO;
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
@ -487,31 +489,64 @@ xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
}
/**
* xprt_rdma_connect - try to establish a transport connection
* xprt_rdma_set_connect_timeout - set timeouts for establishing a connection
* @xprt: controlling transport instance
* @connect_timeout: reconnect timeout after client disconnects
* @reconnect_timeout: reconnect timeout after server disconnects
*
*/
static void xprt_rdma_tcp_set_connect_timeout(struct rpc_xprt *xprt,
unsigned long connect_timeout,
unsigned long reconnect_timeout)
{
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout);
spin_lock(&xprt->transport_lock);
if (connect_timeout < xprt->connect_timeout) {
struct rpc_timeout to;
unsigned long initval;
to = *xprt->timeout;
initval = connect_timeout;
if (initval < RPCRDMA_INIT_REEST_TO << 1)
initval = RPCRDMA_INIT_REEST_TO << 1;
to.to_initval = initval;
to.to_maxval = initval;
r_xprt->rx_timeout = to;
xprt->timeout = &r_xprt->rx_timeout;
xprt->connect_timeout = connect_timeout;
}
if (reconnect_timeout < xprt->max_reconnect_timeout)
xprt->max_reconnect_timeout = reconnect_timeout;
spin_unlock(&xprt->transport_lock);
}
/**
* xprt_rdma_connect - schedule an attempt to reconnect
* @xprt: transport state
* @task: RPC scheduler context
* @task: RPC scheduler context (unused)
*
*/
static void
xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
{
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
unsigned long delay;
trace_xprtrdma_op_connect(r_xprt);
delay = 0;
if (r_xprt->rx_ep.rep_connected != 0) {
/* Reconnect */
schedule_delayed_work(&r_xprt->rx_connect_worker,
xprt->reestablish_timeout);
xprt->reestablish_timeout <<= 1;
if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
} else {
schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
if (!RPC_IS_ASYNC(task))
flush_delayed_work(&r_xprt->rx_connect_worker);
delay = xprt_reconnect_delay(xprt);
xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO);
}
queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker,
delay);
}
/**
@ -769,6 +804,7 @@ static const struct rpc_xprt_ops xprt_rdma_procs = {
.send_request = xprt_rdma_send_request,
.close = xprt_rdma_close,
.destroy = xprt_rdma_destroy,
.set_connect_timeout = xprt_rdma_tcp_set_connect_timeout,
.print_stats = xprt_rdma_print_stats,
.enable_swap = xprt_rdma_enable_swap,
.disable_swap = xprt_rdma_disable_swap,

1
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -432,6 +432,7 @@ struct rpcrdma_xprt {
struct rpcrdma_ep rx_ep;
struct rpcrdma_buffer rx_buf;
struct delayed_work rx_connect_worker;
struct rpc_timeout rx_timeout;
struct rpcrdma_stats rx_stats;
};

23
net/sunrpc/xprtsock.c
View File

@ -2402,25 +2402,6 @@ static void xs_tcp_setup_socket(struct work_struct *work)
xprt_wake_pending_tasks(xprt, status);
}
static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
{
unsigned long start, now = jiffies;
start = xprt->stat.connect_start + xprt->reestablish_timeout;
if (time_after(start, now))
return start - now;
return 0;
}
static void xs_reconnect_backoff(struct rpc_xprt *xprt)
{
xprt->reestablish_timeout <<= 1;
if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
xprt->reestablish_timeout = xprt->max_reconnect_timeout;
if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
}
/**
* xs_connect - connect a socket to a remote endpoint
* @xprt: pointer to transport structure
@ -2450,8 +2431,8 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
/* Start by resetting any existing state */
xs_reset_transport(transport);
delay = xs_reconnect_delay(xprt);
xs_reconnect_backoff(xprt);
delay = xprt_reconnect_delay(xprt);
xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
} else
dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);