forked from luck/tmp_suning_uos_patched
SUNRPC: Clean up transport write space handling
Treat socket write space handling in the same way we now treat transport congestion: by denying the XPRT_LOCK until the transport signals that it has free buffer space. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
parent
36bd7de949
commit
c544577dad
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@ -84,7 +84,6 @@ struct svc_xprt {
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struct sockaddr_storage xpt_remote; /* remote peer's address */
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size_t xpt_remotelen; /* length of address */
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char xpt_remotebuf[INET6_ADDRSTRLEN + 10];
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struct rpc_wait_queue xpt_bc_pending; /* backchannel wait queue */
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struct list_head xpt_users; /* callbacks on free */
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struct net *xpt_net;
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@ -387,8 +387,8 @@ int xprt_load_transport(const char *);
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void xprt_set_retrans_timeout_def(struct rpc_task *task);
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void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
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void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
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void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
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void xprt_write_space(struct rpc_xprt *xprt);
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void xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
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bool xprt_write_space(struct rpc_xprt *xprt);
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void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
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struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
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void xprt_update_rtt(struct rpc_task *task);
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@ -416,6 +416,7 @@ void xprt_unlock_connect(struct rpc_xprt *, void *);
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#define XPRT_CLOSING (6)
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#define XPRT_CONGESTED (9)
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#define XPRT_CWND_WAIT (10)
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#define XPRT_WRITE_SPACE (11)
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static inline void xprt_set_connected(struct rpc_xprt *xprt)
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{
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@ -1964,13 +1964,14 @@ call_transmit(struct rpc_task *task)
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{
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dprint_status(task);
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task->tk_status = 0;
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if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) {
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if (!xprt_prepare_transmit(task))
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return;
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xprt_transmit(task);
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}
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task->tk_action = call_transmit_status;
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if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
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return;
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if (!xprt_prepare_transmit(task))
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return;
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xprt_transmit(task);
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xprt_end_transmit(task);
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}
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/*
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@ -1986,7 +1987,6 @@ call_transmit_status(struct rpc_task *task)
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* test first.
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*/
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if (task->tk_status == 0) {
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xprt_end_transmit(task);
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xprt_request_wait_receive(task);
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return;
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}
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@ -1994,15 +1994,8 @@ call_transmit_status(struct rpc_task *task)
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switch (task->tk_status) {
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default:
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dprint_status(task);
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xprt_end_transmit(task);
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break;
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case -EBADSLT:
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xprt_end_transmit(task);
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task->tk_action = call_transmit;
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task->tk_status = 0;
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break;
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case -EBADMSG:
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xprt_end_transmit(task);
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task->tk_status = 0;
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task->tk_action = call_encode;
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break;
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@ -2015,6 +2008,7 @@ call_transmit_status(struct rpc_task *task)
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case -ENOBUFS:
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rpc_delay(task, HZ>>2);
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/* fall through */
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case -EBADSLT:
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case -EAGAIN:
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task->tk_action = call_transmit;
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task->tk_status = 0;
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@ -2026,7 +2020,6 @@ call_transmit_status(struct rpc_task *task)
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case -ENETUNREACH:
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case -EPERM:
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if (RPC_IS_SOFTCONN(task)) {
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xprt_end_transmit(task);
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if (!task->tk_msg.rpc_proc->p_proc)
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trace_xprt_ping(task->tk_xprt,
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task->tk_status);
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@ -2069,9 +2062,6 @@ call_bc_transmit(struct rpc_task *task)
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xprt_transmit(task);
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if (task->tk_status == -EAGAIN)
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goto out_retry;
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xprt_end_transmit(task);
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dprint_status(task);
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switch (task->tk_status) {
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@ -2087,6 +2077,8 @@ call_bc_transmit(struct rpc_task *task)
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case -ENOTCONN:
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case -EPIPE:
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break;
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case -EAGAIN:
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goto out_retry;
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case -ETIMEDOUT:
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/*
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* Problem reaching the server. Disconnect and let the
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@ -171,7 +171,6 @@ void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl,
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mutex_init(&xprt->xpt_mutex);
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spin_lock_init(&xprt->xpt_lock);
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set_bit(XPT_BUSY, &xprt->xpt_flags);
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rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending");
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xprt->xpt_net = get_net(net);
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strcpy(xprt->xpt_remotebuf, "uninitialized");
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}
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@ -895,7 +894,6 @@ int svc_send(struct svc_rqst *rqstp)
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else
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len = xprt->xpt_ops->xpo_sendto(rqstp);
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mutex_unlock(&xprt->xpt_mutex);
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rpc_wake_up(&xprt->xpt_bc_pending);
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trace_svc_send(rqstp, len);
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svc_xprt_release(rqstp);
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@ -169,6 +169,17 @@ int xprt_load_transport(const char *transport_name)
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}
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EXPORT_SYMBOL_GPL(xprt_load_transport);
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static void xprt_clear_locked(struct rpc_xprt *xprt)
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{
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xprt->snd_task = NULL;
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if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) {
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smp_mb__before_atomic();
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clear_bit(XPRT_LOCKED, &xprt->state);
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smp_mb__after_atomic();
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} else
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queue_work(xprtiod_workqueue, &xprt->task_cleanup);
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}
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/**
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* xprt_reserve_xprt - serialize write access to transports
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* @task: task that is requesting access to the transport
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@ -188,10 +199,14 @@ int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
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return 1;
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goto out_sleep;
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}
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if (test_bit(XPRT_WRITE_SPACE, &xprt->state))
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goto out_unlock;
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xprt->snd_task = task;
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return 1;
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out_unlock:
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xprt_clear_locked(xprt);
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out_sleep:
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dprintk("RPC: %5u failed to lock transport %p\n",
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task->tk_pid, xprt);
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@ -208,17 +223,6 @@ int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
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}
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EXPORT_SYMBOL_GPL(xprt_reserve_xprt);
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static void xprt_clear_locked(struct rpc_xprt *xprt)
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{
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xprt->snd_task = NULL;
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if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) {
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smp_mb__before_atomic();
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clear_bit(XPRT_LOCKED, &xprt->state);
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smp_mb__after_atomic();
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} else
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queue_work(xprtiod_workqueue, &xprt->task_cleanup);
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}
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static bool
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xprt_need_congestion_window_wait(struct rpc_xprt *xprt)
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{
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@ -267,10 +271,13 @@ int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task)
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xprt->snd_task = task;
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return 1;
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}
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if (test_bit(XPRT_WRITE_SPACE, &xprt->state))
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goto out_unlock;
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if (!xprt_need_congestion_window_wait(xprt)) {
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xprt->snd_task = task;
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return 1;
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}
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out_unlock:
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xprt_clear_locked(xprt);
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out_sleep:
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dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt);
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@ -309,10 +316,12 @@ static void __xprt_lock_write_next(struct rpc_xprt *xprt)
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{
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if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
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return;
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if (test_bit(XPRT_WRITE_SPACE, &xprt->state))
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goto out_unlock;
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if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending,
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__xprt_lock_write_func, xprt))
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return;
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out_unlock:
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xprt_clear_locked(xprt);
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}
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@ -320,6 +329,8 @@ static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt)
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{
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if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
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return;
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if (test_bit(XPRT_WRITE_SPACE, &xprt->state))
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goto out_unlock;
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if (xprt_need_congestion_window_wait(xprt))
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goto out_unlock;
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if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending,
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@ -510,39 +521,46 @@ EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks);
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/**
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* xprt_wait_for_buffer_space - wait for transport output buffer to clear
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* @task: task to be put to sleep
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* @action: function pointer to be executed after wait
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* @xprt: transport
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*
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* Note that we only set the timer for the case of RPC_IS_SOFT(), since
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* we don't in general want to force a socket disconnection due to
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* an incomplete RPC call transmission.
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*/
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void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action)
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void xprt_wait_for_buffer_space(struct rpc_xprt *xprt)
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{
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struct rpc_rqst *req = task->tk_rqstp;
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struct rpc_xprt *xprt = req->rq_xprt;
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task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0;
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rpc_sleep_on(&xprt->pending, task, action);
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set_bit(XPRT_WRITE_SPACE, &xprt->state);
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}
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EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space);
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static bool
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xprt_clear_write_space_locked(struct rpc_xprt *xprt)
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{
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if (test_and_clear_bit(XPRT_WRITE_SPACE, &xprt->state)) {
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__xprt_lock_write_next(xprt);
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dprintk("RPC: write space: waking waiting task on "
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"xprt %p\n", xprt);
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return true;
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}
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return false;
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}
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/**
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* xprt_write_space - wake the task waiting for transport output buffer space
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* @xprt: transport with waiting tasks
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*
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* Can be called in a soft IRQ context, so xprt_write_space never sleeps.
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*/
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void xprt_write_space(struct rpc_xprt *xprt)
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bool xprt_write_space(struct rpc_xprt *xprt)
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{
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bool ret;
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if (!test_bit(XPRT_WRITE_SPACE, &xprt->state))
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return false;
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spin_lock_bh(&xprt->transport_lock);
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if (xprt->snd_task) {
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dprintk("RPC: write space: waking waiting task on "
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"xprt %p\n", xprt);
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rpc_wake_up_queued_task_on_wq(xprtiod_workqueue,
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&xprt->pending, xprt->snd_task);
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}
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ret = xprt_clear_write_space_locked(xprt);
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spin_unlock_bh(&xprt->transport_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(xprt_write_space);
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@ -653,6 +671,7 @@ void xprt_disconnect_done(struct rpc_xprt *xprt)
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dprintk("RPC: disconnected transport %p\n", xprt);
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spin_lock_bh(&xprt->transport_lock);
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xprt_clear_connected(xprt);
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xprt_clear_write_space_locked(xprt);
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xprt_wake_pending_tasks(xprt, -EAGAIN);
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spin_unlock_bh(&xprt->transport_lock);
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}
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@ -1326,9 +1345,7 @@ xprt_transmit(struct rpc_task *task)
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if (!xprt_request_data_received(task) ||
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test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
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continue;
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} else if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
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rpc_wake_up_queued_task(&xprt->pending, task);
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else
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} else if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate))
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task->tk_status = status;
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break;
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}
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@ -866,7 +866,7 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
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out_err:
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switch (ret) {
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case -EAGAIN:
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xprt_wait_for_buffer_space(rqst->rq_task, NULL);
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xprt_wait_for_buffer_space(rqst->rq_xprt);
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break;
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case -ENOBUFS:
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break;
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@ -224,12 +224,7 @@ xprt_rdma_bc_send_request(struct rpc_rqst *rqst, struct rpc_task *task)
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dprintk("svcrdma: sending bc call with xid: %08x\n",
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be32_to_cpu(rqst->rq_xid));
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if (!mutex_trylock(&sxprt->xpt_mutex)) {
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rpc_sleep_on(&sxprt->xpt_bc_pending, task, NULL);
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if (!mutex_trylock(&sxprt->xpt_mutex))
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return -EAGAIN;
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rpc_wake_up_queued_task(&sxprt->xpt_bc_pending, task);
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}
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mutex_lock(&sxprt->xpt_mutex);
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ret = -ENOTCONN;
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rdma = container_of(sxprt, struct svcxprt_rdma, sc_xprt);
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@ -440,20 +440,12 @@ static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
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return err;
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}
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static void xs_nospace_callback(struct rpc_task *task)
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{
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struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
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transport->inet->sk_write_pending--;
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}
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/**
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* xs_nospace - place task on wait queue if transmit was incomplete
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* xs_nospace - handle transmit was incomplete
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* @req: pointer to RPC request
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* @task: task to put to sleep
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*
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*/
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static int xs_nospace(struct rpc_rqst *req, struct rpc_task *task)
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static int xs_nospace(struct rpc_rqst *req)
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{
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struct rpc_xprt *xprt = req->rq_xprt;
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struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
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@ -461,7 +453,8 @@ static int xs_nospace(struct rpc_rqst *req, struct rpc_task *task)
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int ret = -EAGAIN;
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dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
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task->tk_pid, req->rq_slen - transport->xmit.offset,
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req->rq_task->tk_pid,
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req->rq_slen - transport->xmit.offset,
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req->rq_slen);
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/* Protect against races with write_space */
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@ -471,7 +464,7 @@ static int xs_nospace(struct rpc_rqst *req, struct rpc_task *task)
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if (xprt_connected(xprt)) {
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/* wait for more buffer space */
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sk->sk_write_pending++;
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xprt_wait_for_buffer_space(task, xs_nospace_callback);
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xprt_wait_for_buffer_space(xprt);
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} else
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ret = -ENOTCONN;
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@ -569,7 +562,7 @@ static int xs_local_send_request(struct rpc_rqst *req, struct rpc_task *task)
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case -ENOBUFS:
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break;
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case -EAGAIN:
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status = xs_nospace(req, task);
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status = xs_nospace(req);
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break;
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default:
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dprintk("RPC: sendmsg returned unrecognized error %d\n",
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@ -642,7 +635,7 @@ static int xs_udp_send_request(struct rpc_rqst *req, struct rpc_task *task)
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/* Should we call xs_close() here? */
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break;
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case -EAGAIN:
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status = xs_nospace(req, task);
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status = xs_nospace(req);
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break;
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case -ENETUNREACH:
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case -ENOBUFS:
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@ -765,7 +758,7 @@ static int xs_tcp_send_request(struct rpc_rqst *req, struct rpc_task *task)
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/* Should we call xs_close() here? */
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break;
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case -EAGAIN:
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status = xs_nospace(req, task);
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status = xs_nospace(req);
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break;
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case -ECONNRESET:
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case -ECONNREFUSED:
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@ -1672,7 +1665,8 @@ static void xs_write_space(struct sock *sk)
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if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
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goto out;
|
||||
|
||||
xprt_write_space(xprt);
|
||||
if (xprt_write_space(xprt))
|
||||
sk->sk_write_pending--;
|
||||
out:
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
@ -2725,12 +2719,7 @@ static int bc_send_request(struct rpc_rqst *req, struct rpc_task *task)
|
|||
* Grab the mutex to serialize data as the connection is shared
|
||||
* with the fore channel
|
||||
*/
|
||||
if (!mutex_trylock(&xprt->xpt_mutex)) {
|
||||
rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
|
||||
if (!mutex_trylock(&xprt->xpt_mutex))
|
||||
return -EAGAIN;
|
||||
rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
|
||||
}
|
||||
mutex_lock(&xprt->xpt_mutex);
|
||||
if (test_bit(XPT_DEAD, &xprt->xpt_flags))
|
||||
len = -ENOTCONN;
|
||||
else
|
||||
|
|
Loading…
Reference in New Issue
Block a user