2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* linux/net/sunrpc/xprt.c
|
|
|
|
*
|
|
|
|
* This is a generic RPC call interface supporting congestion avoidance,
|
|
|
|
* and asynchronous calls.
|
|
|
|
*
|
|
|
|
* The interface works like this:
|
|
|
|
*
|
|
|
|
* - When a process places a call, it allocates a request slot if
|
|
|
|
* one is available. Otherwise, it sleeps on the backlog queue
|
|
|
|
* (xprt_reserve).
|
|
|
|
* - Next, the caller puts together the RPC message, stuffs it into
|
|
|
|
* the request struct, and calls xprt_call().
|
|
|
|
* - xprt_call transmits the message and installs the caller on the
|
|
|
|
* socket's wait list. At the same time, it installs a timer that
|
|
|
|
* is run after the packet's timeout has expired.
|
|
|
|
* - When a packet arrives, the data_ready handler walks the list of
|
|
|
|
* pending requests for that socket. If a matching XID is found, the
|
|
|
|
* caller is woken up, and the timer removed.
|
|
|
|
* - When no reply arrives within the timeout interval, the timer is
|
|
|
|
* fired by the kernel and runs xprt_timer(). It either adjusts the
|
|
|
|
* timeout values (minor timeout) or wakes up the caller with a status
|
|
|
|
* of -ETIMEDOUT.
|
|
|
|
* - When the caller receives a notification from RPC that a reply arrived,
|
|
|
|
* it should release the RPC slot, and process the reply.
|
|
|
|
* If the call timed out, it may choose to retry the operation by
|
|
|
|
* adjusting the initial timeout value, and simply calling rpc_call
|
|
|
|
* again.
|
|
|
|
*
|
|
|
|
* Support for async RPC is done through a set of RPC-specific scheduling
|
|
|
|
* primitives that `transparently' work for processes as well as async
|
|
|
|
* tasks that rely on callbacks.
|
|
|
|
*
|
|
|
|
* Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
|
|
|
|
*/
|
|
|
|
|
2005-08-12 04:25:23 +08:00
|
|
|
#include <linux/module.h>
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/types.h>
|
2005-08-12 04:25:23 +08:00
|
|
|
#include <linux/interrupt.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/workqueue.h>
|
|
|
|
#include <linux/random.h>
|
|
|
|
|
2005-08-12 04:25:23 +08:00
|
|
|
#include <linux/sunrpc/clnt.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Local variables
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifdef RPC_DEBUG
|
|
|
|
# undef RPC_DEBUG_DATA
|
|
|
|
# define RPCDBG_FACILITY RPCDBG_XPRT
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#define XPRT_MAX_BACKOFF (8)
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Local functions
|
|
|
|
*/
|
|
|
|
static void xprt_request_init(struct rpc_task *, struct rpc_xprt *);
|
|
|
|
static inline void do_xprt_reserve(struct rpc_task *);
|
|
|
|
static void xprt_connect_status(struct rpc_task *task);
|
|
|
|
static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
|
|
|
|
|
|
|
|
static int xprt_clear_backlog(struct rpc_xprt *xprt);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Serialize write access to sockets, in order to prevent different
|
|
|
|
* requests from interfering with each other.
|
|
|
|
* Also prevents TCP socket connects from colliding with writes.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
__xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
|
|
{
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
|
2005-08-12 04:25:38 +08:00
|
|
|
if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
if (task == xprt->snd_task)
|
|
|
|
return 1;
|
|
|
|
goto out_sleep;
|
|
|
|
}
|
|
|
|
if (xprt->nocong || __xprt_get_cong(xprt, task)) {
|
|
|
|
xprt->snd_task = task;
|
|
|
|
if (req) {
|
|
|
|
req->rq_bytes_sent = 0;
|
|
|
|
req->rq_ntrans++;
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
smp_mb__before_clear_bit();
|
2005-08-12 04:25:38 +08:00
|
|
|
clear_bit(XPRT_LOCKED, &xprt->state);
|
2005-04-17 06:20:36 +08:00
|
|
|
smp_mb__after_clear_bit();
|
|
|
|
out_sleep:
|
|
|
|
dprintk("RPC: %4d failed to lock socket %p\n", task->tk_pid, xprt);
|
|
|
|
task->tk_timeout = 0;
|
|
|
|
task->tk_status = -EAGAIN;
|
|
|
|
if (req && req->rq_ntrans)
|
|
|
|
rpc_sleep_on(&xprt->resend, task, NULL, NULL);
|
|
|
|
else
|
|
|
|
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int
|
|
|
|
xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
retval = __xprt_lock_write(xprt, task);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
__xprt_lock_write_next(struct rpc_xprt *xprt)
|
|
|
|
{
|
|
|
|
struct rpc_task *task;
|
|
|
|
|
2005-08-12 04:25:38 +08:00
|
|
|
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
|
2005-04-17 06:20:36 +08:00
|
|
|
return;
|
|
|
|
if (!xprt->nocong && RPCXPRT_CONGESTED(xprt))
|
|
|
|
goto out_unlock;
|
|
|
|
task = rpc_wake_up_next(&xprt->resend);
|
|
|
|
if (!task) {
|
|
|
|
task = rpc_wake_up_next(&xprt->sending);
|
|
|
|
if (!task)
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
if (xprt->nocong || __xprt_get_cong(xprt, task)) {
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
xprt->snd_task = task;
|
|
|
|
if (req) {
|
|
|
|
req->rq_bytes_sent = 0;
|
|
|
|
req->rq_ntrans++;
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
out_unlock:
|
|
|
|
smp_mb__before_clear_bit();
|
2005-08-12 04:25:38 +08:00
|
|
|
clear_bit(XPRT_LOCKED, &xprt->state);
|
2005-04-17 06:20:36 +08:00
|
|
|
smp_mb__after_clear_bit();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Releases the socket for use by other requests.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
__xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
|
|
{
|
|
|
|
if (xprt->snd_task == task) {
|
|
|
|
xprt->snd_task = NULL;
|
|
|
|
smp_mb__before_clear_bit();
|
2005-08-12 04:25:38 +08:00
|
|
|
clear_bit(XPRT_LOCKED, &xprt->state);
|
2005-04-17 06:20:36 +08:00
|
|
|
smp_mb__after_clear_bit();
|
|
|
|
__xprt_lock_write_next(xprt);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
|
|
{
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
__xprt_release_write(xprt, task);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Van Jacobson congestion avoidance. Check if the congestion window
|
|
|
|
* overflowed. Put the task to sleep if this is the case.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
__xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
|
|
{
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
|
|
|
|
if (req->rq_cong)
|
|
|
|
return 1;
|
|
|
|
dprintk("RPC: %4d xprt_cwnd_limited cong = %ld cwnd = %ld\n",
|
|
|
|
task->tk_pid, xprt->cong, xprt->cwnd);
|
|
|
|
if (RPCXPRT_CONGESTED(xprt))
|
|
|
|
return 0;
|
|
|
|
req->rq_cong = 1;
|
|
|
|
xprt->cong += RPC_CWNDSCALE;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Adjust the congestion window, and wake up the next task
|
|
|
|
* that has been sleeping due to congestion
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
__xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req)
|
|
|
|
{
|
|
|
|
if (!req->rq_cong)
|
|
|
|
return;
|
|
|
|
req->rq_cong = 0;
|
|
|
|
xprt->cong -= RPC_CWNDSCALE;
|
|
|
|
__xprt_lock_write_next(xprt);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Adjust RPC congestion window
|
|
|
|
* We use a time-smoothed congestion estimator to avoid heavy oscillation.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
xprt_adjust_cwnd(struct rpc_xprt *xprt, int result)
|
|
|
|
{
|
|
|
|
unsigned long cwnd;
|
|
|
|
|
|
|
|
cwnd = xprt->cwnd;
|
|
|
|
if (result >= 0 && cwnd <= xprt->cong) {
|
|
|
|
/* The (cwnd >> 1) term makes sure
|
|
|
|
* the result gets rounded properly. */
|
|
|
|
cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd;
|
|
|
|
if (cwnd > RPC_MAXCWND(xprt))
|
|
|
|
cwnd = RPC_MAXCWND(xprt);
|
|
|
|
__xprt_lock_write_next(xprt);
|
|
|
|
} else if (result == -ETIMEDOUT) {
|
|
|
|
cwnd >>= 1;
|
|
|
|
if (cwnd < RPC_CWNDSCALE)
|
|
|
|
cwnd = RPC_CWNDSCALE;
|
|
|
|
}
|
|
|
|
dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n",
|
|
|
|
xprt->cong, xprt->cwnd, cwnd);
|
|
|
|
xprt->cwnd = cwnd;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xprt_reset_majortimeo(struct rpc_rqst *req)
|
|
|
|
{
|
|
|
|
struct rpc_timeout *to = &req->rq_xprt->timeout;
|
|
|
|
|
|
|
|
req->rq_majortimeo = req->rq_timeout;
|
|
|
|
if (to->to_exponential)
|
|
|
|
req->rq_majortimeo <<= to->to_retries;
|
|
|
|
else
|
|
|
|
req->rq_majortimeo += to->to_increment * to->to_retries;
|
|
|
|
if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0)
|
|
|
|
req->rq_majortimeo = to->to_maxval;
|
|
|
|
req->rq_majortimeo += jiffies;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_adjust_timeout - adjust timeout values for next retransmit
|
|
|
|
* @req: RPC request containing parameters to use for the adjustment
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
|
|
|
int xprt_adjust_timeout(struct rpc_rqst *req)
|
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
struct rpc_timeout *to = &xprt->timeout;
|
|
|
|
int status = 0;
|
|
|
|
|
|
|
|
if (time_before(jiffies, req->rq_majortimeo)) {
|
|
|
|
if (to->to_exponential)
|
|
|
|
req->rq_timeout <<= 1;
|
|
|
|
else
|
|
|
|
req->rq_timeout += to->to_increment;
|
|
|
|
if (to->to_maxval && req->rq_timeout >= to->to_maxval)
|
|
|
|
req->rq_timeout = to->to_maxval;
|
|
|
|
req->rq_retries++;
|
|
|
|
pprintk("RPC: %lu retrans\n", jiffies);
|
|
|
|
} else {
|
|
|
|
req->rq_timeout = to->to_initval;
|
|
|
|
req->rq_retries = 0;
|
|
|
|
xprt_reset_majortimeo(req);
|
|
|
|
/* Reset the RTT counters == "slow start" */
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
pprintk("RPC: %lu timeout\n", jiffies);
|
|
|
|
status = -ETIMEDOUT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (req->rq_timeout == 0) {
|
|
|
|
printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n");
|
|
|
|
req->rq_timeout = 5 * HZ;
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
xprt_socket_autoclose(void *args)
|
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
|
|
|
|
|
|
|
|
xprt_disconnect(xprt);
|
2005-08-12 04:25:23 +08:00
|
|
|
xprt->ops->close(xprt);
|
2005-04-17 06:20:36 +08:00
|
|
|
xprt_release_write(xprt, NULL);
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_disconnect - mark a transport as disconnected
|
|
|
|
* @xprt: transport to flag for disconnect
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:23 +08:00
|
|
|
void xprt_disconnect(struct rpc_xprt *xprt)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
dprintk("RPC: disconnected transport %p\n", xprt);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
xprt_clear_connected(xprt);
|
|
|
|
rpc_wake_up_status(&xprt->pending, -ENOTCONN);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
xprt_init_autodisconnect(unsigned long data)
|
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = (struct rpc_xprt *)data;
|
|
|
|
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!list_empty(&xprt->recv) || xprt->shutdown)
|
|
|
|
goto out_abort;
|
2005-08-12 04:25:38 +08:00
|
|
|
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
|
2005-04-17 06:20:36 +08:00
|
|
|
goto out_abort;
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Let keventd close the socket */
|
2005-08-12 04:25:38 +08:00
|
|
|
if (xprt_connecting(xprt))
|
2005-04-17 06:20:36 +08:00
|
|
|
xprt_release_write(xprt, NULL);
|
|
|
|
else
|
|
|
|
schedule_work(&xprt->task_cleanup);
|
|
|
|
return;
|
|
|
|
out_abort:
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_connect - schedule a transport connect operation
|
|
|
|
* @task: RPC task that is requesting the connect
|
2005-04-17 06:20:36 +08:00
|
|
|
*
|
|
|
|
*/
|
|
|
|
void xprt_connect(struct rpc_task *task)
|
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
|
|
|
|
dprintk("RPC: %4d xprt_connect xprt %p %s connected\n", task->tk_pid,
|
|
|
|
xprt, (xprt_connected(xprt) ? "is" : "is not"));
|
|
|
|
|
|
|
|
if (xprt->shutdown) {
|
|
|
|
task->tk_status = -EIO;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (!xprt->addr.sin_port) {
|
|
|
|
task->tk_status = -EIO;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (!xprt_lock_write(xprt, task))
|
|
|
|
return;
|
|
|
|
if (xprt_connected(xprt))
|
2005-08-12 04:25:23 +08:00
|
|
|
xprt_release_write(xprt, task);
|
|
|
|
else {
|
|
|
|
if (task->tk_rqstp)
|
|
|
|
task->tk_rqstp->rq_bytes_sent = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2005-08-12 04:25:23 +08:00
|
|
|
task->tk_timeout = RPC_CONNECT_TIMEOUT;
|
|
|
|
rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL);
|
|
|
|
xprt->ops->connect(task);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static void xprt_connect_status(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
|
|
|
|
if (task->tk_status >= 0) {
|
|
|
|
dprintk("RPC: %4d xprt_connect_status: connection established\n",
|
|
|
|
task->tk_pid);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (task->tk_status) {
|
|
|
|
case -ECONNREFUSED:
|
|
|
|
case -ECONNRESET:
|
2005-08-12 04:25:08 +08:00
|
|
|
dprintk("RPC: %4d xprt_connect_status: server %s refused connection\n",
|
|
|
|
task->tk_pid, task->tk_client->cl_server);
|
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
case -ENOTCONN:
|
2005-08-12 04:25:08 +08:00
|
|
|
dprintk("RPC: %4d xprt_connect_status: connection broken\n",
|
|
|
|
task->tk_pid);
|
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
case -ETIMEDOUT:
|
2005-08-12 04:25:08 +08:00
|
|
|
dprintk("RPC: %4d xprt_connect_status: connect attempt timed out\n",
|
2005-04-17 06:20:36 +08:00
|
|
|
task->tk_pid);
|
|
|
|
break;
|
|
|
|
default:
|
2005-08-12 04:25:08 +08:00
|
|
|
dprintk("RPC: %4d xprt_connect_status: error %d connecting to server %s\n",
|
|
|
|
task->tk_pid, -task->tk_status, task->tk_client->cl_server);
|
|
|
|
xprt_release_write(xprt, task);
|
|
|
|
task->tk_status = -EIO;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if soft mounted, just cause this RPC to fail */
|
|
|
|
if (RPC_IS_SOFT(task)) {
|
|
|
|
xprt_release_write(xprt, task);
|
|
|
|
task->tk_status = -EIO;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_lookup_rqst - find an RPC request corresponding to an XID
|
|
|
|
* @xprt: transport on which the original request was transmitted
|
|
|
|
* @xid: RPC XID of incoming reply
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:23 +08:00
|
|
|
struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct list_head *pos;
|
|
|
|
struct rpc_rqst *req = NULL;
|
|
|
|
|
|
|
|
list_for_each(pos, &xprt->recv) {
|
|
|
|
struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list);
|
|
|
|
if (entry->rq_xid == xid) {
|
|
|
|
req = entry;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return req;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_complete_rqst - called when reply processing is complete
|
|
|
|
* @xprt: controlling transport
|
|
|
|
* @req: RPC request that just completed
|
|
|
|
* @copied: actual number of bytes received from the transport
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:23 +08:00
|
|
|
void xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_task *task = req->rq_task;
|
|
|
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
|
|
|
|
|
/* Adjust congestion window */
|
|
|
|
if (!xprt->nocong) {
|
|
|
|
unsigned timer = task->tk_msg.rpc_proc->p_timer;
|
|
|
|
xprt_adjust_cwnd(xprt, copied);
|
|
|
|
__xprt_put_cong(xprt, req);
|
|
|
|
if (timer) {
|
|
|
|
if (req->rq_ntrans == 1)
|
|
|
|
rpc_update_rtt(clnt->cl_rtt, timer,
|
|
|
|
(long)jiffies - req->rq_xtime);
|
|
|
|
rpc_set_timeo(clnt->cl_rtt, timer, req->rq_ntrans - 1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef RPC_PROFILE
|
|
|
|
/* Profile only reads for now */
|
|
|
|
if (copied > 1024) {
|
|
|
|
static unsigned long nextstat;
|
|
|
|
static unsigned long pkt_rtt, pkt_len, pkt_cnt;
|
|
|
|
|
|
|
|
pkt_cnt++;
|
|
|
|
pkt_len += req->rq_slen + copied;
|
|
|
|
pkt_rtt += jiffies - req->rq_xtime;
|
|
|
|
if (time_before(nextstat, jiffies)) {
|
|
|
|
printk("RPC: %lu %ld cwnd\n", jiffies, xprt->cwnd);
|
|
|
|
printk("RPC: %ld %ld %ld %ld stat\n",
|
|
|
|
jiffies, pkt_cnt, pkt_len, pkt_rtt);
|
|
|
|
pkt_rtt = pkt_len = pkt_cnt = 0;
|
|
|
|
nextstat = jiffies + 5 * HZ;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
dprintk("RPC: %4d has input (%d bytes)\n", task->tk_pid, copied);
|
|
|
|
list_del_init(&req->rq_list);
|
|
|
|
req->rq_received = req->rq_private_buf.len = copied;
|
|
|
|
|
|
|
|
/* ... and wake up the process. */
|
|
|
|
rpc_wake_up_task(task);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* RPC receive timeout handler.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
xprt_timer(struct rpc_task *task)
|
|
|
|
{
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (req->rq_received)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
xprt_adjust_cwnd(req->rq_xprt, -ETIMEDOUT);
|
|
|
|
__xprt_put_cong(xprt, req);
|
|
|
|
|
|
|
|
dprintk("RPC: %4d xprt_timer (%s request)\n",
|
|
|
|
task->tk_pid, req ? "pending" : "backlogged");
|
|
|
|
|
|
|
|
task->tk_status = -ETIMEDOUT;
|
|
|
|
out:
|
|
|
|
task->tk_timeout = 0;
|
|
|
|
rpc_wake_up_task(task);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_prepare_transmit - reserve the transport before sending a request
|
|
|
|
* @task: RPC task about to send a request
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:26 +08:00
|
|
|
int xprt_prepare_transmit(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
dprintk("RPC: %4d xprt_prepare_transmit\n", task->tk_pid);
|
|
|
|
|
|
|
|
if (xprt->shutdown)
|
|
|
|
return -EIO;
|
|
|
|
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (req->rq_received && !req->rq_bytes_sent) {
|
|
|
|
err = req->rq_received;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
if (!__xprt_lock_write(xprt, task)) {
|
|
|
|
err = -EAGAIN;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!xprt_connected(xprt)) {
|
|
|
|
err = -ENOTCONN;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
out_unlock:
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_transmit - send an RPC request on a transport
|
|
|
|
* @task: controlling RPC task
|
|
|
|
*
|
|
|
|
* We have to copy the iovec because sendmsg fiddles with its contents.
|
|
|
|
*/
|
|
|
|
void xprt_transmit(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_clnt *clnt = task->tk_client;
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
2005-08-12 04:25:23 +08:00
|
|
|
int status;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
dprintk("RPC: %4d xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
|
|
|
|
|
|
|
|
smp_rmb();
|
|
|
|
if (!req->rq_received) {
|
|
|
|
if (list_empty(&req->rq_list)) {
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Update the softirq receive buffer */
|
|
|
|
memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
|
|
|
|
sizeof(req->rq_private_buf));
|
|
|
|
/* Add request to the receive list */
|
|
|
|
list_add_tail(&req->rq_list, &xprt->recv);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
xprt_reset_majortimeo(req);
|
2005-06-23 01:16:28 +08:00
|
|
|
/* Turn off autodisconnect */
|
|
|
|
del_singleshot_timer_sync(&xprt->timer);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
} else if (!req->rq_bytes_sent)
|
|
|
|
return;
|
|
|
|
|
2005-08-12 04:25:23 +08:00
|
|
|
status = xprt->ops->send_request(task);
|
|
|
|
if (!status)
|
|
|
|
goto out_receive;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/* Note: at this point, task->tk_sleeping has not yet been set,
|
|
|
|
* hence there is no danger of the waking up task being put on
|
|
|
|
* schedq, and being picked up by a parallel run of rpciod().
|
|
|
|
*/
|
|
|
|
task->tk_status = status;
|
|
|
|
|
|
|
|
switch (status) {
|
|
|
|
case -ECONNREFUSED:
|
|
|
|
task->tk_timeout = RPC_REESTABLISH_TIMEOUT;
|
|
|
|
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
|
2005-08-12 04:25:23 +08:00
|
|
|
case -EAGAIN:
|
2005-04-17 06:20:36 +08:00
|
|
|
case -ENOTCONN:
|
|
|
|
return;
|
|
|
|
default:
|
|
|
|
if (xprt->stream)
|
|
|
|
xprt_disconnect(xprt);
|
|
|
|
}
|
|
|
|
xprt_release_write(xprt, task);
|
|
|
|
return;
|
|
|
|
out_receive:
|
|
|
|
dprintk("RPC: %4d xmit complete\n", task->tk_pid);
|
|
|
|
/* Set the task's receive timeout value */
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!xprt->nocong) {
|
|
|
|
int timer = task->tk_msg.rpc_proc->p_timer;
|
|
|
|
task->tk_timeout = rpc_calc_rto(clnt->cl_rtt, timer);
|
|
|
|
task->tk_timeout <<= rpc_ntimeo(clnt->cl_rtt, timer) + req->rq_retries;
|
|
|
|
if (task->tk_timeout > xprt->timeout.to_maxval || task->tk_timeout == 0)
|
|
|
|
task->tk_timeout = xprt->timeout.to_maxval;
|
|
|
|
} else
|
|
|
|
task->tk_timeout = req->rq_timeout;
|
|
|
|
/* Don't race with disconnect */
|
|
|
|
if (!xprt_connected(xprt))
|
|
|
|
task->tk_status = -ENOTCONN;
|
|
|
|
else if (!req->rq_received)
|
|
|
|
rpc_sleep_on(&xprt->pending, task, NULL, xprt_timer);
|
|
|
|
__xprt_release_write(xprt, task);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static inline void do_xprt_reserve(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
|
|
|
|
task->tk_status = 0;
|
|
|
|
if (task->tk_rqstp)
|
|
|
|
return;
|
|
|
|
if (!list_empty(&xprt->free)) {
|
|
|
|
struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list);
|
|
|
|
list_del_init(&req->rq_list);
|
|
|
|
task->tk_rqstp = req;
|
|
|
|
xprt_request_init(task, xprt);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
dprintk("RPC: waiting for request slot\n");
|
|
|
|
task->tk_status = -EAGAIN;
|
|
|
|
task->tk_timeout = 0;
|
|
|
|
rpc_sleep_on(&xprt->backlog, task, NULL, NULL);
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_reserve - allocate an RPC request slot
|
|
|
|
* @task: RPC task requesting a slot allocation
|
|
|
|
*
|
|
|
|
* If no more slots are available, place the task on the transport's
|
|
|
|
* backlog queue.
|
|
|
|
*/
|
|
|
|
void xprt_reserve(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
|
|
|
|
task->tk_status = -EIO;
|
|
|
|
if (!xprt->shutdown) {
|
2005-08-12 04:25:35 +08:00
|
|
|
spin_lock(&xprt->reserve_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
do_xprt_reserve(task);
|
2005-08-12 04:25:35 +08:00
|
|
|
spin_unlock(&xprt->reserve_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u32 xprt_alloc_xid(struct rpc_xprt *xprt)
|
|
|
|
{
|
|
|
|
return xprt->xid++;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void xprt_init_xid(struct rpc_xprt *xprt)
|
|
|
|
{
|
|
|
|
get_random_bytes(&xprt->xid, sizeof(xprt->xid));
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
|
|
|
|
|
|
req->rq_timeout = xprt->timeout.to_initval;
|
|
|
|
req->rq_task = task;
|
|
|
|
req->rq_xprt = xprt;
|
|
|
|
req->rq_xid = xprt_alloc_xid(xprt);
|
|
|
|
dprintk("RPC: %4d reserved req %p xid %08x\n", task->tk_pid,
|
|
|
|
req, ntohl(req->rq_xid));
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_release - release an RPC request slot
|
|
|
|
* @task: task which is finished with the slot
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:26 +08:00
|
|
|
void xprt_release(struct rpc_task *task)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
struct rpc_rqst *req;
|
|
|
|
|
|
|
|
if (!(req = task->tk_rqstp))
|
|
|
|
return;
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
__xprt_release_write(xprt, task);
|
|
|
|
__xprt_put_cong(xprt, req);
|
|
|
|
if (!list_empty(&req->rq_list))
|
|
|
|
list_del(&req->rq_list);
|
|
|
|
xprt->last_used = jiffies;
|
|
|
|
if (list_empty(&xprt->recv) && !xprt->shutdown)
|
2005-08-12 04:25:23 +08:00
|
|
|
mod_timer(&xprt->timer,
|
|
|
|
xprt->last_used + RPC_IDLE_DISCONNECT_TIMEOUT);
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
task->tk_rqstp = NULL;
|
|
|
|
memset(req, 0, sizeof(*req)); /* mark unused */
|
|
|
|
|
|
|
|
dprintk("RPC: %4d release request %p\n", task->tk_pid, req);
|
|
|
|
|
2005-08-12 04:25:35 +08:00
|
|
|
spin_lock(&xprt->reserve_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
list_add(&req->rq_list, &xprt->free);
|
|
|
|
xprt_clear_backlog(xprt);
|
2005-08-12 04:25:35 +08:00
|
|
|
spin_unlock(&xprt->reserve_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_set_timeout - set constant RPC timeout
|
|
|
|
* @to: RPC timeout parameters to set up
|
|
|
|
* @retr: number of retries
|
|
|
|
* @incr: amount of increase after each retry
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:26 +08:00
|
|
|
void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
to->to_initval =
|
|
|
|
to->to_increment = incr;
|
2005-08-12 04:25:14 +08:00
|
|
|
to->to_maxval = to->to_initval + (incr * retr);
|
2005-04-17 06:20:36 +08:00
|
|
|
to->to_retries = retr;
|
|
|
|
to->to_exponential = 0;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static struct rpc_xprt *xprt_setup(int proto, struct sockaddr_in *ap, struct rpc_timeout *to)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2005-08-12 04:25:23 +08:00
|
|
|
int result;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct rpc_xprt *xprt;
|
|
|
|
struct rpc_rqst *req;
|
|
|
|
|
|
|
|
if ((xprt = kmalloc(sizeof(struct rpc_xprt), GFP_KERNEL)) == NULL)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memset(xprt, 0, sizeof(*xprt)); /* Nnnngh! */
|
|
|
|
|
|
|
|
xprt->addr = *ap;
|
2005-08-12 04:25:23 +08:00
|
|
|
|
|
|
|
switch (proto) {
|
|
|
|
case IPPROTO_UDP:
|
|
|
|
result = xs_setup_udp(xprt, to);
|
|
|
|
break;
|
|
|
|
case IPPROTO_TCP:
|
|
|
|
result = xs_setup_tcp(xprt, to);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n",
|
|
|
|
proto);
|
|
|
|
result = -EIO;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (result) {
|
|
|
|
kfree(xprt);
|
|
|
|
return ERR_PTR(result);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2005-08-12 04:25:23 +08:00
|
|
|
|
2005-08-12 04:25:32 +08:00
|
|
|
spin_lock_init(&xprt->transport_lock);
|
2005-08-12 04:25:35 +08:00
|
|
|
spin_lock_init(&xprt->reserve_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
init_waitqueue_head(&xprt->cong_wait);
|
|
|
|
|
|
|
|
INIT_LIST_HEAD(&xprt->free);
|
|
|
|
INIT_LIST_HEAD(&xprt->recv);
|
|
|
|
INIT_WORK(&xprt->task_cleanup, xprt_socket_autoclose, xprt);
|
|
|
|
init_timer(&xprt->timer);
|
|
|
|
xprt->timer.function = xprt_init_autodisconnect;
|
|
|
|
xprt->timer.data = (unsigned long) xprt;
|
|
|
|
xprt->last_used = jiffies;
|
|
|
|
|
|
|
|
rpc_init_wait_queue(&xprt->pending, "xprt_pending");
|
|
|
|
rpc_init_wait_queue(&xprt->sending, "xprt_sending");
|
|
|
|
rpc_init_wait_queue(&xprt->resend, "xprt_resend");
|
|
|
|
rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog");
|
|
|
|
|
|
|
|
/* initialize free list */
|
2005-08-12 04:25:23 +08:00
|
|
|
for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--)
|
2005-04-17 06:20:36 +08:00
|
|
|
list_add(&req->rq_list, &xprt->free);
|
|
|
|
|
|
|
|
xprt_init_xid(xprt);
|
|
|
|
|
|
|
|
dprintk("RPC: created transport %p with %u slots\n", xprt,
|
|
|
|
xprt->max_reqs);
|
|
|
|
|
|
|
|
return xprt;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_create_proto - create an RPC client transport
|
|
|
|
* @proto: requested transport protocol
|
|
|
|
* @sap: remote peer's address
|
|
|
|
* @to: timeout parameters for new transport
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:26 +08:00
|
|
|
struct rpc_xprt *xprt_create_proto(int proto, struct sockaddr_in *sap, struct rpc_timeout *to)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_xprt *xprt;
|
|
|
|
|
|
|
|
xprt = xprt_setup(proto, sap, to);
|
|
|
|
if (IS_ERR(xprt))
|
|
|
|
dprintk("RPC: xprt_create_proto failed\n");
|
|
|
|
else
|
|
|
|
dprintk("RPC: xprt_create_proto created xprt %p\n", xprt);
|
|
|
|
return xprt;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static void xprt_shutdown(struct rpc_xprt *xprt)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
xprt->shutdown = 1;
|
|
|
|
rpc_wake_up(&xprt->sending);
|
|
|
|
rpc_wake_up(&xprt->resend);
|
|
|
|
rpc_wake_up(&xprt->pending);
|
|
|
|
rpc_wake_up(&xprt->backlog);
|
|
|
|
wake_up(&xprt->cong_wait);
|
|
|
|
del_timer_sync(&xprt->timer);
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
static int xprt_clear_backlog(struct rpc_xprt *xprt) {
|
2005-04-17 06:20:36 +08:00
|
|
|
rpc_wake_up_next(&xprt->backlog);
|
|
|
|
wake_up(&xprt->cong_wait);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2005-08-12 04:25:26 +08:00
|
|
|
/**
|
|
|
|
* xprt_destroy - destroy an RPC transport, killing off all requests.
|
|
|
|
* @xprt: transport to destroy
|
|
|
|
*
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2005-08-12 04:25:26 +08:00
|
|
|
int xprt_destroy(struct rpc_xprt *xprt)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
dprintk("RPC: destroying transport %p\n", xprt);
|
|
|
|
xprt_shutdown(xprt);
|
2005-08-12 04:25:23 +08:00
|
|
|
xprt->ops->destroy(xprt);
|
2005-04-17 06:20:36 +08:00
|
|
|
kfree(xprt);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|