11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/net/sunrpc/xprt.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * This is a generic RPC call interface supporting congestion avoidance, 51da177e4SLinus Torvalds * and asynchronous calls. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * The interface works like this: 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * - When a process places a call, it allocates a request slot if 101da177e4SLinus Torvalds * one is available. Otherwise, it sleeps on the backlog queue 111da177e4SLinus Torvalds * (xprt_reserve). 121da177e4SLinus Torvalds * - Next, the caller puts together the RPC message, stuffs it into 1355aa4f58SChuck Lever * the request struct, and calls xprt_transmit(). 1455aa4f58SChuck Lever * - xprt_transmit sends the message and installs the caller on the 1555aa4f58SChuck Lever * transport's wait list. At the same time, it installs a timer that 161da177e4SLinus Torvalds * is run after the packet's timeout has expired. 171da177e4SLinus Torvalds * - When a packet arrives, the data_ready handler walks the list of 1855aa4f58SChuck Lever * pending requests for that transport. If a matching XID is found, the 191da177e4SLinus Torvalds * caller is woken up, and the timer removed. 201da177e4SLinus Torvalds * - When no reply arrives within the timeout interval, the timer is 211da177e4SLinus Torvalds * fired by the kernel and runs xprt_timer(). It either adjusts the 221da177e4SLinus Torvalds * timeout values (minor timeout) or wakes up the caller with a status 231da177e4SLinus Torvalds * of -ETIMEDOUT. 241da177e4SLinus Torvalds * - When the caller receives a notification from RPC that a reply arrived, 251da177e4SLinus Torvalds * it should release the RPC slot, and process the reply. 261da177e4SLinus Torvalds * If the call timed out, it may choose to retry the operation by 271da177e4SLinus Torvalds * adjusting the initial timeout value, and simply calling rpc_call 281da177e4SLinus Torvalds * again. 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Support for async RPC is done through a set of RPC-specific scheduling 311da177e4SLinus Torvalds * primitives that `transparently' work for processes as well as async 321da177e4SLinus Torvalds * tasks that rely on callbacks. 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> 3555aa4f58SChuck Lever * 3655aa4f58SChuck Lever * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> 371da177e4SLinus Torvalds */ 381da177e4SLinus Torvalds 39a246b010SChuck Lever #include <linux/module.h> 40a246b010SChuck Lever 411da177e4SLinus Torvalds #include <linux/types.h> 42a246b010SChuck Lever #include <linux/interrupt.h> 431da177e4SLinus Torvalds #include <linux/workqueue.h> 44bf3fcf89SChuck Lever #include <linux/net.h> 451da177e4SLinus Torvalds 46a246b010SChuck Lever #include <linux/sunrpc/clnt.h> 4711c556b3SChuck Lever #include <linux/sunrpc/metrics.h> 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds /* 501da177e4SLinus Torvalds * Local variables 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #ifdef RPC_DEBUG 541da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_XPRT 551da177e4SLinus Torvalds #endif 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds /* 581da177e4SLinus Torvalds * Local functions 591da177e4SLinus Torvalds */ 601da177e4SLinus Torvalds static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); 611da177e4SLinus Torvalds static inline void do_xprt_reserve(struct rpc_task *); 621da177e4SLinus Torvalds static void xprt_connect_status(struct rpc_task *task); 631da177e4SLinus Torvalds static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); 641da177e4SLinus Torvalds 655ba03e82SJiri Slaby static DEFINE_SPINLOCK(xprt_list_lock); 6681c098afS\"Talpey, Thomas\ static LIST_HEAD(xprt_list); 6781c098afS\"Talpey, Thomas\ 68555ee3afSChuck Lever /* 69555ee3afSChuck Lever * The transport code maintains an estimate on the maximum number of out- 70555ee3afSChuck Lever * standing RPC requests, using a smoothed version of the congestion 71555ee3afSChuck Lever * avoidance implemented in 44BSD. This is basically the Van Jacobson 72555ee3afSChuck Lever * congestion algorithm: If a retransmit occurs, the congestion window is 73555ee3afSChuck Lever * halved; otherwise, it is incremented by 1/cwnd when 74555ee3afSChuck Lever * 75555ee3afSChuck Lever * - a reply is received and 76555ee3afSChuck Lever * - a full number of requests are outstanding and 77555ee3afSChuck Lever * - the congestion window hasn't been updated recently. 78555ee3afSChuck Lever */ 79555ee3afSChuck Lever #define RPC_CWNDSHIFT (8U) 80555ee3afSChuck Lever #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) 81555ee3afSChuck Lever #define RPC_INITCWND RPC_CWNDSCALE 82555ee3afSChuck Lever #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) 83555ee3afSChuck Lever 84555ee3afSChuck Lever #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) 851da177e4SLinus Torvalds 8612a80469SChuck Lever /** 8781c098afS\"Talpey, Thomas\ * xprt_register_transport - register a transport implementation 8881c098afS\"Talpey, Thomas\ * @transport: transport to register 8981c098afS\"Talpey, Thomas\ * 9081c098afS\"Talpey, Thomas\ * If a transport implementation is loaded as a kernel module, it can 9181c098afS\"Talpey, Thomas\ * call this interface to make itself known to the RPC client. 9281c098afS\"Talpey, Thomas\ * 9381c098afS\"Talpey, Thomas\ * Returns: 9481c098afS\"Talpey, Thomas\ * 0: transport successfully registered 9581c098afS\"Talpey, Thomas\ * -EEXIST: transport already registered 9681c098afS\"Talpey, Thomas\ * -EINVAL: transport module being unloaded 9781c098afS\"Talpey, Thomas\ */ 9881c098afS\"Talpey, Thomas\ int xprt_register_transport(struct xprt_class *transport) 9981c098afS\"Talpey, Thomas\ { 10081c098afS\"Talpey, Thomas\ struct xprt_class *t; 10181c098afS\"Talpey, Thomas\ int result; 10281c098afS\"Talpey, Thomas\ 10381c098afS\"Talpey, Thomas\ result = -EEXIST; 10481c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 10581c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 10681c098afS\"Talpey, Thomas\ /* don't register the same transport class twice */ 1074fa016ebS\"Talpey, Thomas\ if (t->ident == transport->ident) 10881c098afS\"Talpey, Thomas\ goto out; 10981c098afS\"Talpey, Thomas\ } 11081c098afS\"Talpey, Thomas\ 11181c098afS\"Talpey, Thomas\ list_add_tail(&transport->list, &xprt_list); 11281c098afS\"Talpey, Thomas\ printk(KERN_INFO "RPC: Registered %s transport module.\n", 11381c098afS\"Talpey, Thomas\ transport->name); 11481c098afS\"Talpey, Thomas\ result = 0; 11581c098afS\"Talpey, Thomas\ 11681c098afS\"Talpey, Thomas\ out: 11781c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 11881c098afS\"Talpey, Thomas\ return result; 11981c098afS\"Talpey, Thomas\ } 12081c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_register_transport); 12181c098afS\"Talpey, Thomas\ 12281c098afS\"Talpey, Thomas\ /** 12381c098afS\"Talpey, Thomas\ * xprt_unregister_transport - unregister a transport implementation 12465b6e42cSRandy Dunlap * @transport: transport to unregister 12581c098afS\"Talpey, Thomas\ * 12681c098afS\"Talpey, Thomas\ * Returns: 12781c098afS\"Talpey, Thomas\ * 0: transport successfully unregistered 12881c098afS\"Talpey, Thomas\ * -ENOENT: transport never registered 12981c098afS\"Talpey, Thomas\ */ 13081c098afS\"Talpey, Thomas\ int xprt_unregister_transport(struct xprt_class *transport) 13181c098afS\"Talpey, Thomas\ { 13281c098afS\"Talpey, Thomas\ struct xprt_class *t; 13381c098afS\"Talpey, Thomas\ int result; 13481c098afS\"Talpey, Thomas\ 13581c098afS\"Talpey, Thomas\ result = 0; 13681c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 13781c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 13881c098afS\"Talpey, Thomas\ if (t == transport) { 13981c098afS\"Talpey, Thomas\ printk(KERN_INFO 14081c098afS\"Talpey, Thomas\ "RPC: Unregistered %s transport module.\n", 14181c098afS\"Talpey, Thomas\ transport->name); 14281c098afS\"Talpey, Thomas\ list_del_init(&transport->list); 14381c098afS\"Talpey, Thomas\ goto out; 14481c098afS\"Talpey, Thomas\ } 14581c098afS\"Talpey, Thomas\ } 14681c098afS\"Talpey, Thomas\ result = -ENOENT; 14781c098afS\"Talpey, Thomas\ 14881c098afS\"Talpey, Thomas\ out: 14981c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 15081c098afS\"Talpey, Thomas\ return result; 15181c098afS\"Talpey, Thomas\ } 15281c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_unregister_transport); 15381c098afS\"Talpey, Thomas\ 15481c098afS\"Talpey, Thomas\ /** 155441e3e24STom Talpey * xprt_load_transport - load a transport implementation 156441e3e24STom Talpey * @transport_name: transport to load 157441e3e24STom Talpey * 158441e3e24STom Talpey * Returns: 159441e3e24STom Talpey * 0: transport successfully loaded 160441e3e24STom Talpey * -ENOENT: transport module not available 161441e3e24STom Talpey */ 162441e3e24STom Talpey int xprt_load_transport(const char *transport_name) 163441e3e24STom Talpey { 164441e3e24STom Talpey struct xprt_class *t; 165441e3e24STom Talpey char module_name[sizeof t->name + 5]; 166441e3e24STom Talpey int result; 167441e3e24STom Talpey 168441e3e24STom Talpey result = 0; 169441e3e24STom Talpey spin_lock(&xprt_list_lock); 170441e3e24STom Talpey list_for_each_entry(t, &xprt_list, list) { 171441e3e24STom Talpey if (strcmp(t->name, transport_name) == 0) { 172441e3e24STom Talpey spin_unlock(&xprt_list_lock); 173441e3e24STom Talpey goto out; 174441e3e24STom Talpey } 175441e3e24STom Talpey } 176441e3e24STom Talpey spin_unlock(&xprt_list_lock); 177441e3e24STom Talpey strcpy(module_name, "xprt"); 178441e3e24STom Talpey strncat(module_name, transport_name, sizeof t->name); 179441e3e24STom Talpey result = request_module(module_name); 180441e3e24STom Talpey out: 181441e3e24STom Talpey return result; 182441e3e24STom Talpey } 183441e3e24STom Talpey EXPORT_SYMBOL_GPL(xprt_load_transport); 184441e3e24STom Talpey 185441e3e24STom Talpey /** 18612a80469SChuck Lever * xprt_reserve_xprt - serialize write access to transports 18712a80469SChuck Lever * @task: task that is requesting access to the transport 18812a80469SChuck Lever * 18912a80469SChuck Lever * This prevents mixing the payload of separate requests, and prevents 19012a80469SChuck Lever * transport connects from colliding with writes. No congestion control 19112a80469SChuck Lever * is provided. 1921da177e4SLinus Torvalds */ 19312a80469SChuck Lever int xprt_reserve_xprt(struct rpc_task *task) 1941da177e4SLinus Torvalds { 19512a80469SChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 19612a80469SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 19712a80469SChuck Lever 19812a80469SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 19912a80469SChuck Lever if (task == xprt->snd_task) 20012a80469SChuck Lever return 1; 20112a80469SChuck Lever if (task == NULL) 20212a80469SChuck Lever return 0; 20312a80469SChuck Lever goto out_sleep; 20412a80469SChuck Lever } 20512a80469SChuck Lever xprt->snd_task = task; 20612a80469SChuck Lever if (req) { 20712a80469SChuck Lever req->rq_bytes_sent = 0; 20812a80469SChuck Lever req->rq_ntrans++; 20912a80469SChuck Lever } 21012a80469SChuck Lever return 1; 21112a80469SChuck Lever 21212a80469SChuck Lever out_sleep: 21346121cf7SChuck Lever dprintk("RPC: %5u failed to lock transport %p\n", 21412a80469SChuck Lever task->tk_pid, xprt); 21512a80469SChuck Lever task->tk_timeout = 0; 21612a80469SChuck Lever task->tk_status = -EAGAIN; 21712a80469SChuck Lever if (req && req->rq_ntrans) 2185d00837bSTrond Myklebust rpc_sleep_on(&xprt->resend, task, NULL); 21912a80469SChuck Lever else 2205d00837bSTrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 22112a80469SChuck Lever return 0; 22212a80469SChuck Lever } 22312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt); 22412a80469SChuck Lever 225632e3bdcSTrond Myklebust static void xprt_clear_locked(struct rpc_xprt *xprt) 226632e3bdcSTrond Myklebust { 227632e3bdcSTrond Myklebust xprt->snd_task = NULL; 228632e3bdcSTrond Myklebust if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { 229632e3bdcSTrond Myklebust smp_mb__before_clear_bit(); 230632e3bdcSTrond Myklebust clear_bit(XPRT_LOCKED, &xprt->state); 231632e3bdcSTrond Myklebust smp_mb__after_clear_bit(); 232632e3bdcSTrond Myklebust } else 233c1384c9cSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 234632e3bdcSTrond Myklebust } 235632e3bdcSTrond Myklebust 23612a80469SChuck Lever /* 23712a80469SChuck Lever * xprt_reserve_xprt_cong - serialize write access to transports 23812a80469SChuck Lever * @task: task that is requesting access to the transport 23912a80469SChuck Lever * 24012a80469SChuck Lever * Same as xprt_reserve_xprt, but Van Jacobson congestion control is 24112a80469SChuck Lever * integrated into the decision of whether a request is allowed to be 24212a80469SChuck Lever * woken up and given access to the transport. 24312a80469SChuck Lever */ 24412a80469SChuck Lever int xprt_reserve_xprt_cong(struct rpc_task *task) 24512a80469SChuck Lever { 24612a80469SChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 2471da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 2481da177e4SLinus Torvalds 2492226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 2501da177e4SLinus Torvalds if (task == xprt->snd_task) 2511da177e4SLinus Torvalds return 1; 2521da177e4SLinus Torvalds goto out_sleep; 2531da177e4SLinus Torvalds } 25412a80469SChuck Lever if (__xprt_get_cong(xprt, task)) { 2551da177e4SLinus Torvalds xprt->snd_task = task; 2561da177e4SLinus Torvalds if (req) { 2571da177e4SLinus Torvalds req->rq_bytes_sent = 0; 2581da177e4SLinus Torvalds req->rq_ntrans++; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds return 1; 2611da177e4SLinus Torvalds } 262632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 2631da177e4SLinus Torvalds out_sleep: 26446121cf7SChuck Lever dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); 2651da177e4SLinus Torvalds task->tk_timeout = 0; 2661da177e4SLinus Torvalds task->tk_status = -EAGAIN; 2671da177e4SLinus Torvalds if (req && req->rq_ntrans) 2685d00837bSTrond Myklebust rpc_sleep_on(&xprt->resend, task, NULL); 2691da177e4SLinus Torvalds else 2705d00837bSTrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 2711da177e4SLinus Torvalds return 0; 2721da177e4SLinus Torvalds } 27312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); 2741da177e4SLinus Torvalds 27512a80469SChuck Lever static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds int retval; 2781da177e4SLinus Torvalds 2794a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 28012a80469SChuck Lever retval = xprt->ops->reserve_xprt(task); 2814a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 2821da177e4SLinus Torvalds return retval; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 28512a80469SChuck Lever static void __xprt_lock_write_next(struct rpc_xprt *xprt) 2861da177e4SLinus Torvalds { 2871da177e4SLinus Torvalds struct rpc_task *task; 28849e9a890SChuck Lever struct rpc_rqst *req; 28949e9a890SChuck Lever 29049e9a890SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 29149e9a890SChuck Lever return; 29249e9a890SChuck Lever 29349e9a890SChuck Lever task = rpc_wake_up_next(&xprt->resend); 29449e9a890SChuck Lever if (!task) { 29549e9a890SChuck Lever task = rpc_wake_up_next(&xprt->sending); 29649e9a890SChuck Lever if (!task) 29749e9a890SChuck Lever goto out_unlock; 29849e9a890SChuck Lever } 29949e9a890SChuck Lever 30049e9a890SChuck Lever req = task->tk_rqstp; 30149e9a890SChuck Lever xprt->snd_task = task; 30249e9a890SChuck Lever if (req) { 30349e9a890SChuck Lever req->rq_bytes_sent = 0; 30449e9a890SChuck Lever req->rq_ntrans++; 30549e9a890SChuck Lever } 30649e9a890SChuck Lever return; 30749e9a890SChuck Lever 30849e9a890SChuck Lever out_unlock: 309632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 31049e9a890SChuck Lever } 31149e9a890SChuck Lever 31249e9a890SChuck Lever static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) 31349e9a890SChuck Lever { 31449e9a890SChuck Lever struct rpc_task *task; 3151da177e4SLinus Torvalds 3162226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 3171da177e4SLinus Torvalds return; 31849e9a890SChuck Lever if (RPCXPRT_CONGESTED(xprt)) 3191da177e4SLinus Torvalds goto out_unlock; 3201da177e4SLinus Torvalds task = rpc_wake_up_next(&xprt->resend); 3211da177e4SLinus Torvalds if (!task) { 3221da177e4SLinus Torvalds task = rpc_wake_up_next(&xprt->sending); 3231da177e4SLinus Torvalds if (!task) 3241da177e4SLinus Torvalds goto out_unlock; 3251da177e4SLinus Torvalds } 32649e9a890SChuck Lever if (__xprt_get_cong(xprt, task)) { 3271da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 3281da177e4SLinus Torvalds xprt->snd_task = task; 3291da177e4SLinus Torvalds if (req) { 3301da177e4SLinus Torvalds req->rq_bytes_sent = 0; 3311da177e4SLinus Torvalds req->rq_ntrans++; 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds return; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds out_unlock: 336632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 33949e9a890SChuck Lever /** 34049e9a890SChuck Lever * xprt_release_xprt - allow other requests to use a transport 34149e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 34249e9a890SChuck Lever * @task: task that is releasing access to the transport 34349e9a890SChuck Lever * 34449e9a890SChuck Lever * Note that "task" can be NULL. No congestion control is provided. 3451da177e4SLinus Torvalds */ 34649e9a890SChuck Lever void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 3471da177e4SLinus Torvalds { 3481da177e4SLinus Torvalds if (xprt->snd_task == task) { 349632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 3501da177e4SLinus Torvalds __xprt_lock_write_next(xprt); 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds } 35312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt); 3541da177e4SLinus Torvalds 35549e9a890SChuck Lever /** 35649e9a890SChuck Lever * xprt_release_xprt_cong - allow other requests to use a transport 35749e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 35849e9a890SChuck Lever * @task: task that is releasing access to the transport 35949e9a890SChuck Lever * 36049e9a890SChuck Lever * Note that "task" can be NULL. Another task is awoken to use the 36149e9a890SChuck Lever * transport if the transport's congestion window allows it. 36249e9a890SChuck Lever */ 36349e9a890SChuck Lever void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) 36449e9a890SChuck Lever { 36549e9a890SChuck Lever if (xprt->snd_task == task) { 366632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 36749e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 36849e9a890SChuck Lever } 36949e9a890SChuck Lever } 37012444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); 37149e9a890SChuck Lever 37249e9a890SChuck Lever static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) 3731da177e4SLinus Torvalds { 3744a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 37549e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 3764a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds /* 3801da177e4SLinus Torvalds * Van Jacobson congestion avoidance. Check if the congestion window 3811da177e4SLinus Torvalds * overflowed. Put the task to sleep if this is the case. 3821da177e4SLinus Torvalds */ 3831da177e4SLinus Torvalds static int 3841da177e4SLinus Torvalds __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) 3851da177e4SLinus Torvalds { 3861da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds if (req->rq_cong) 3891da177e4SLinus Torvalds return 1; 39046121cf7SChuck Lever dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", 3911da177e4SLinus Torvalds task->tk_pid, xprt->cong, xprt->cwnd); 3921da177e4SLinus Torvalds if (RPCXPRT_CONGESTED(xprt)) 3931da177e4SLinus Torvalds return 0; 3941da177e4SLinus Torvalds req->rq_cong = 1; 3951da177e4SLinus Torvalds xprt->cong += RPC_CWNDSCALE; 3961da177e4SLinus Torvalds return 1; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* 4001da177e4SLinus Torvalds * Adjust the congestion window, and wake up the next task 4011da177e4SLinus Torvalds * that has been sleeping due to congestion 4021da177e4SLinus Torvalds */ 4031da177e4SLinus Torvalds static void 4041da177e4SLinus Torvalds __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) 4051da177e4SLinus Torvalds { 4061da177e4SLinus Torvalds if (!req->rq_cong) 4071da177e4SLinus Torvalds return; 4081da177e4SLinus Torvalds req->rq_cong = 0; 4091da177e4SLinus Torvalds xprt->cong -= RPC_CWNDSCALE; 41049e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 41346c0ee8bSChuck Lever /** 414a58dd398SChuck Lever * xprt_release_rqst_cong - housekeeping when request is complete 415a58dd398SChuck Lever * @task: RPC request that recently completed 416a58dd398SChuck Lever * 417a58dd398SChuck Lever * Useful for transports that require congestion control. 418a58dd398SChuck Lever */ 419a58dd398SChuck Lever void xprt_release_rqst_cong(struct rpc_task *task) 420a58dd398SChuck Lever { 421a58dd398SChuck Lever __xprt_put_cong(task->tk_xprt, task->tk_rqstp); 422a58dd398SChuck Lever } 42312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); 424a58dd398SChuck Lever 425a58dd398SChuck Lever /** 42646c0ee8bSChuck Lever * xprt_adjust_cwnd - adjust transport congestion window 42746c0ee8bSChuck Lever * @task: recently completed RPC request used to adjust window 42846c0ee8bSChuck Lever * @result: result code of completed RPC request 42946c0ee8bSChuck Lever * 4301da177e4SLinus Torvalds * We use a time-smoothed congestion estimator to avoid heavy oscillation. 4311da177e4SLinus Torvalds */ 43246c0ee8bSChuck Lever void xprt_adjust_cwnd(struct rpc_task *task, int result) 4331da177e4SLinus Torvalds { 43446c0ee8bSChuck Lever struct rpc_rqst *req = task->tk_rqstp; 43546c0ee8bSChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 43646c0ee8bSChuck Lever unsigned long cwnd = xprt->cwnd; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds if (result >= 0 && cwnd <= xprt->cong) { 4391da177e4SLinus Torvalds /* The (cwnd >> 1) term makes sure 4401da177e4SLinus Torvalds * the result gets rounded properly. */ 4411da177e4SLinus Torvalds cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; 4421da177e4SLinus Torvalds if (cwnd > RPC_MAXCWND(xprt)) 4431da177e4SLinus Torvalds cwnd = RPC_MAXCWND(xprt); 44449e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 4451da177e4SLinus Torvalds } else if (result == -ETIMEDOUT) { 4461da177e4SLinus Torvalds cwnd >>= 1; 4471da177e4SLinus Torvalds if (cwnd < RPC_CWNDSCALE) 4481da177e4SLinus Torvalds cwnd = RPC_CWNDSCALE; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", 4511da177e4SLinus Torvalds xprt->cong, xprt->cwnd, cwnd); 4521da177e4SLinus Torvalds xprt->cwnd = cwnd; 45346c0ee8bSChuck Lever __xprt_put_cong(xprt, req); 4541da177e4SLinus Torvalds } 45512444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); 4561da177e4SLinus Torvalds 45744fbac22SChuck Lever /** 45844fbac22SChuck Lever * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue 45944fbac22SChuck Lever * @xprt: transport with waiting tasks 46044fbac22SChuck Lever * @status: result code to plant in each task before waking it 46144fbac22SChuck Lever * 46244fbac22SChuck Lever */ 46344fbac22SChuck Lever void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) 46444fbac22SChuck Lever { 46544fbac22SChuck Lever if (status < 0) 46644fbac22SChuck Lever rpc_wake_up_status(&xprt->pending, status); 46744fbac22SChuck Lever else 46844fbac22SChuck Lever rpc_wake_up(&xprt->pending); 46944fbac22SChuck Lever } 47012444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); 47144fbac22SChuck Lever 472c7b2cae8SChuck Lever /** 473c7b2cae8SChuck Lever * xprt_wait_for_buffer_space - wait for transport output buffer to clear 474c7b2cae8SChuck Lever * @task: task to be put to sleep 4750b80ae42SRandy Dunlap * @action: function pointer to be executed after wait 476c7b2cae8SChuck Lever */ 477b6ddf64fSTrond Myklebust void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) 478c7b2cae8SChuck Lever { 479c7b2cae8SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 480c7b2cae8SChuck Lever struct rpc_xprt *xprt = req->rq_xprt; 481c7b2cae8SChuck Lever 482c7b2cae8SChuck Lever task->tk_timeout = req->rq_timeout; 483b6ddf64fSTrond Myklebust rpc_sleep_on(&xprt->pending, task, action); 484c7b2cae8SChuck Lever } 48512444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); 486c7b2cae8SChuck Lever 487c7b2cae8SChuck Lever /** 488c7b2cae8SChuck Lever * xprt_write_space - wake the task waiting for transport output buffer space 489c7b2cae8SChuck Lever * @xprt: transport with waiting tasks 490c7b2cae8SChuck Lever * 491c7b2cae8SChuck Lever * Can be called in a soft IRQ context, so xprt_write_space never sleeps. 492c7b2cae8SChuck Lever */ 493c7b2cae8SChuck Lever void xprt_write_space(struct rpc_xprt *xprt) 494c7b2cae8SChuck Lever { 495c7b2cae8SChuck Lever if (unlikely(xprt->shutdown)) 496c7b2cae8SChuck Lever return; 497c7b2cae8SChuck Lever 498c7b2cae8SChuck Lever spin_lock_bh(&xprt->transport_lock); 499c7b2cae8SChuck Lever if (xprt->snd_task) { 50046121cf7SChuck Lever dprintk("RPC: write space: waking waiting task on " 50146121cf7SChuck Lever "xprt %p\n", xprt); 502fda13939STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); 503c7b2cae8SChuck Lever } 504c7b2cae8SChuck Lever spin_unlock_bh(&xprt->transport_lock); 505c7b2cae8SChuck Lever } 50612444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_write_space); 507c7b2cae8SChuck Lever 508fe3aca29SChuck Lever /** 509fe3aca29SChuck Lever * xprt_set_retrans_timeout_def - set a request's retransmit timeout 510fe3aca29SChuck Lever * @task: task whose timeout is to be set 511fe3aca29SChuck Lever * 512fe3aca29SChuck Lever * Set a request's retransmit timeout based on the transport's 513fe3aca29SChuck Lever * default timeout parameters. Used by transports that don't adjust 514fe3aca29SChuck Lever * the retransmit timeout based on round-trip time estimation. 515fe3aca29SChuck Lever */ 516fe3aca29SChuck Lever void xprt_set_retrans_timeout_def(struct rpc_task *task) 517fe3aca29SChuck Lever { 518fe3aca29SChuck Lever task->tk_timeout = task->tk_rqstp->rq_timeout; 519fe3aca29SChuck Lever } 52012444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); 521fe3aca29SChuck Lever 522fe3aca29SChuck Lever /* 523fe3aca29SChuck Lever * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout 524fe3aca29SChuck Lever * @task: task whose timeout is to be set 525fe3aca29SChuck Lever * 526fe3aca29SChuck Lever * Set a request's retransmit timeout using the RTT estimator. 527fe3aca29SChuck Lever */ 528fe3aca29SChuck Lever void xprt_set_retrans_timeout_rtt(struct rpc_task *task) 529fe3aca29SChuck Lever { 530fe3aca29SChuck Lever int timer = task->tk_msg.rpc_proc->p_timer; 531ba7392bbSTrond Myklebust struct rpc_clnt *clnt = task->tk_client; 532ba7392bbSTrond Myklebust struct rpc_rtt *rtt = clnt->cl_rtt; 533fe3aca29SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 534ba7392bbSTrond Myklebust unsigned long max_timeout = clnt->cl_timeout->to_maxval; 535fe3aca29SChuck Lever 536fe3aca29SChuck Lever task->tk_timeout = rpc_calc_rto(rtt, timer); 537fe3aca29SChuck Lever task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; 538fe3aca29SChuck Lever if (task->tk_timeout > max_timeout || task->tk_timeout == 0) 539fe3aca29SChuck Lever task->tk_timeout = max_timeout; 540fe3aca29SChuck Lever } 54112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); 542fe3aca29SChuck Lever 5431da177e4SLinus Torvalds static void xprt_reset_majortimeo(struct rpc_rqst *req) 5441da177e4SLinus Torvalds { 545ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds req->rq_majortimeo = req->rq_timeout; 5481da177e4SLinus Torvalds if (to->to_exponential) 5491da177e4SLinus Torvalds req->rq_majortimeo <<= to->to_retries; 5501da177e4SLinus Torvalds else 5511da177e4SLinus Torvalds req->rq_majortimeo += to->to_increment * to->to_retries; 5521da177e4SLinus Torvalds if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) 5531da177e4SLinus Torvalds req->rq_majortimeo = to->to_maxval; 5541da177e4SLinus Torvalds req->rq_majortimeo += jiffies; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds 5579903cd1cSChuck Lever /** 5589903cd1cSChuck Lever * xprt_adjust_timeout - adjust timeout values for next retransmit 5599903cd1cSChuck Lever * @req: RPC request containing parameters to use for the adjustment 5609903cd1cSChuck Lever * 5611da177e4SLinus Torvalds */ 5621da177e4SLinus Torvalds int xprt_adjust_timeout(struct rpc_rqst *req) 5631da177e4SLinus Torvalds { 5641da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 565ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 5661da177e4SLinus Torvalds int status = 0; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds if (time_before(jiffies, req->rq_majortimeo)) { 5691da177e4SLinus Torvalds if (to->to_exponential) 5701da177e4SLinus Torvalds req->rq_timeout <<= 1; 5711da177e4SLinus Torvalds else 5721da177e4SLinus Torvalds req->rq_timeout += to->to_increment; 5731da177e4SLinus Torvalds if (to->to_maxval && req->rq_timeout >= to->to_maxval) 5741da177e4SLinus Torvalds req->rq_timeout = to->to_maxval; 5751da177e4SLinus Torvalds req->rq_retries++; 5761da177e4SLinus Torvalds } else { 5771da177e4SLinus Torvalds req->rq_timeout = to->to_initval; 5781da177e4SLinus Torvalds req->rq_retries = 0; 5791da177e4SLinus Torvalds xprt_reset_majortimeo(req); 5801da177e4SLinus Torvalds /* Reset the RTT counters == "slow start" */ 5814a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 5821da177e4SLinus Torvalds rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); 5834a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 5841da177e4SLinus Torvalds status = -ETIMEDOUT; 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds if (req->rq_timeout == 0) { 5881da177e4SLinus Torvalds printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); 5891da177e4SLinus Torvalds req->rq_timeout = 5 * HZ; 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds return status; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 59465f27f38SDavid Howells static void xprt_autoclose(struct work_struct *work) 5951da177e4SLinus Torvalds { 59665f27f38SDavid Howells struct rpc_xprt *xprt = 59765f27f38SDavid Howells container_of(work, struct rpc_xprt, task_cleanup); 5981da177e4SLinus Torvalds 599a246b010SChuck Lever xprt->ops->close(xprt); 60066af1e55STrond Myklebust clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 6011da177e4SLinus Torvalds xprt_release_write(xprt, NULL); 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6049903cd1cSChuck Lever /** 60562da3b24STrond Myklebust * xprt_disconnect_done - mark a transport as disconnected 6069903cd1cSChuck Lever * @xprt: transport to flag for disconnect 6079903cd1cSChuck Lever * 6081da177e4SLinus Torvalds */ 60962da3b24STrond Myklebust void xprt_disconnect_done(struct rpc_xprt *xprt) 6101da177e4SLinus Torvalds { 6111da177e4SLinus Torvalds dprintk("RPC: disconnected transport %p\n", xprt); 6124a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 6131da177e4SLinus Torvalds xprt_clear_connected(xprt); 6142a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 6154a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 6161da177e4SLinus Torvalds } 61762da3b24STrond Myklebust EXPORT_SYMBOL_GPL(xprt_disconnect_done); 6181da177e4SLinus Torvalds 61966af1e55STrond Myklebust /** 62066af1e55STrond Myklebust * xprt_force_disconnect - force a transport to disconnect 62166af1e55STrond Myklebust * @xprt: transport to disconnect 62266af1e55STrond Myklebust * 62366af1e55STrond Myklebust */ 62466af1e55STrond Myklebust void xprt_force_disconnect(struct rpc_xprt *xprt) 62566af1e55STrond Myklebust { 62666af1e55STrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 62766af1e55STrond Myklebust spin_lock_bh(&xprt->transport_lock); 62866af1e55STrond Myklebust set_bit(XPRT_CLOSE_WAIT, &xprt->state); 62966af1e55STrond Myklebust /* Try to schedule an autoclose RPC call */ 63066af1e55STrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 63166af1e55STrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6322a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 63366af1e55STrond Myklebust spin_unlock_bh(&xprt->transport_lock); 63466af1e55STrond Myklebust } 63566af1e55STrond Myklebust 6367c1d71cfSTrond Myklebust /** 6377c1d71cfSTrond Myklebust * xprt_conditional_disconnect - force a transport to disconnect 6387c1d71cfSTrond Myklebust * @xprt: transport to disconnect 6397c1d71cfSTrond Myklebust * @cookie: 'connection cookie' 6407c1d71cfSTrond Myklebust * 6417c1d71cfSTrond Myklebust * This attempts to break the connection if and only if 'cookie' matches 6427c1d71cfSTrond Myklebust * the current transport 'connection cookie'. It ensures that we don't 6437c1d71cfSTrond Myklebust * try to break the connection more than once when we need to retransmit 6447c1d71cfSTrond Myklebust * a batch of RPC requests. 6457c1d71cfSTrond Myklebust * 6467c1d71cfSTrond Myklebust */ 6477c1d71cfSTrond Myklebust void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) 6487c1d71cfSTrond Myklebust { 6497c1d71cfSTrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 6507c1d71cfSTrond Myklebust spin_lock_bh(&xprt->transport_lock); 6517c1d71cfSTrond Myklebust if (cookie != xprt->connect_cookie) 6527c1d71cfSTrond Myklebust goto out; 6537c1d71cfSTrond Myklebust if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) 6547c1d71cfSTrond Myklebust goto out; 6557c1d71cfSTrond Myklebust set_bit(XPRT_CLOSE_WAIT, &xprt->state); 6567c1d71cfSTrond Myklebust /* Try to schedule an autoclose RPC call */ 6577c1d71cfSTrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 6587c1d71cfSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6592a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 6607c1d71cfSTrond Myklebust out: 6617c1d71cfSTrond Myklebust spin_unlock_bh(&xprt->transport_lock); 6627c1d71cfSTrond Myklebust } 6637c1d71cfSTrond Myklebust 6641da177e4SLinus Torvalds static void 6651da177e4SLinus Torvalds xprt_init_autodisconnect(unsigned long data) 6661da177e4SLinus Torvalds { 6671da177e4SLinus Torvalds struct rpc_xprt *xprt = (struct rpc_xprt *)data; 6681da177e4SLinus Torvalds 6694a0f8c04SChuck Lever spin_lock(&xprt->transport_lock); 6701da177e4SLinus Torvalds if (!list_empty(&xprt->recv) || xprt->shutdown) 6711da177e4SLinus Torvalds goto out_abort; 6722226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 6731da177e4SLinus Torvalds goto out_abort; 6744a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 675f75e6745STrond Myklebust set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 676c1384c9cSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6771da177e4SLinus Torvalds return; 6781da177e4SLinus Torvalds out_abort: 6794a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 6829903cd1cSChuck Lever /** 6839903cd1cSChuck Lever * xprt_connect - schedule a transport connect operation 6849903cd1cSChuck Lever * @task: RPC task that is requesting the connect 6851da177e4SLinus Torvalds * 6861da177e4SLinus Torvalds */ 6871da177e4SLinus Torvalds void xprt_connect(struct rpc_task *task) 6881da177e4SLinus Torvalds { 6891da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 6901da177e4SLinus Torvalds 69146121cf7SChuck Lever dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, 6921da177e4SLinus Torvalds xprt, (xprt_connected(xprt) ? "is" : "is not")); 6931da177e4SLinus Torvalds 694ec739ef0SChuck Lever if (!xprt_bound(xprt)) { 69501d37c42STrond Myklebust task->tk_status = -EAGAIN; 6961da177e4SLinus Torvalds return; 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds if (!xprt_lock_write(xprt, task)) 6991da177e4SLinus Torvalds return; 7001da177e4SLinus Torvalds if (xprt_connected(xprt)) 701a246b010SChuck Lever xprt_release_write(xprt, task); 702a246b010SChuck Lever else { 7031da177e4SLinus Torvalds if (task->tk_rqstp) 7041da177e4SLinus Torvalds task->tk_rqstp->rq_bytes_sent = 0; 7051da177e4SLinus Torvalds 70603bf4b70SChuck Lever task->tk_timeout = xprt->connect_timeout; 7075d00837bSTrond Myklebust rpc_sleep_on(&xprt->pending, task, xprt_connect_status); 708262ca07dSChuck Lever xprt->stat.connect_start = jiffies; 709a246b010SChuck Lever xprt->ops->connect(task); 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds return; 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 7149903cd1cSChuck Lever static void xprt_connect_status(struct rpc_task *task) 7151da177e4SLinus Torvalds { 7161da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 7171da177e4SLinus Torvalds 718cd983ef8SChuck Lever if (task->tk_status == 0) { 719262ca07dSChuck Lever xprt->stat.connect_count++; 720262ca07dSChuck Lever xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; 72146121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: connection established\n", 7221da177e4SLinus Torvalds task->tk_pid); 7231da177e4SLinus Torvalds return; 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds switch (task->tk_status) { 7272a491991STrond Myklebust case -EAGAIN: 7282a491991STrond Myklebust dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); 72923475d66SChuck Lever break; 7301da177e4SLinus Torvalds case -ETIMEDOUT: 73146121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: connect attempt timed " 73246121cf7SChuck Lever "out\n", task->tk_pid); 7331da177e4SLinus Torvalds break; 7341da177e4SLinus Torvalds default: 73546121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: error %d connecting to " 73646121cf7SChuck Lever "server %s\n", task->tk_pid, -task->tk_status, 73746121cf7SChuck Lever task->tk_client->cl_server); 7381da177e4SLinus Torvalds xprt_release_write(xprt, task); 73923475d66SChuck Lever task->tk_status = -EIO; 74023475d66SChuck Lever } 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds 7439903cd1cSChuck Lever /** 7449903cd1cSChuck Lever * xprt_lookup_rqst - find an RPC request corresponding to an XID 7459903cd1cSChuck Lever * @xprt: transport on which the original request was transmitted 7469903cd1cSChuck Lever * @xid: RPC XID of incoming reply 7479903cd1cSChuck Lever * 7481da177e4SLinus Torvalds */ 749d8ed029dSAlexey Dobriyan struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds struct list_head *pos; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds list_for_each(pos, &xprt->recv) { 7541da177e4SLinus Torvalds struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); 755262ca07dSChuck Lever if (entry->rq_xid == xid) 756262ca07dSChuck Lever return entry; 7571da177e4SLinus Torvalds } 75846121cf7SChuck Lever 75946121cf7SChuck Lever dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", 76046121cf7SChuck Lever ntohl(xid)); 761262ca07dSChuck Lever xprt->stat.bad_xids++; 762262ca07dSChuck Lever return NULL; 7631da177e4SLinus Torvalds } 76412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_lookup_rqst); 7651da177e4SLinus Torvalds 7669903cd1cSChuck Lever /** 7671570c1e4SChuck Lever * xprt_update_rtt - update an RPC client's RTT state after receiving a reply 7681570c1e4SChuck Lever * @task: RPC request that recently completed 7699903cd1cSChuck Lever * 7701da177e4SLinus Torvalds */ 7711570c1e4SChuck Lever void xprt_update_rtt(struct rpc_task *task) 7721da177e4SLinus Torvalds { 7731570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 7741570c1e4SChuck Lever struct rpc_rtt *rtt = task->tk_client->cl_rtt; 7751da177e4SLinus Torvalds unsigned timer = task->tk_msg.rpc_proc->p_timer; 7761570c1e4SChuck Lever 7771da177e4SLinus Torvalds if (timer) { 7781da177e4SLinus Torvalds if (req->rq_ntrans == 1) 7791570c1e4SChuck Lever rpc_update_rtt(rtt, timer, 7801da177e4SLinus Torvalds (long)jiffies - req->rq_xtime); 7811570c1e4SChuck Lever rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds } 78412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_update_rtt); 7851da177e4SLinus Torvalds 7861570c1e4SChuck Lever /** 7871570c1e4SChuck Lever * xprt_complete_rqst - called when reply processing is complete 7881570c1e4SChuck Lever * @task: RPC request that recently completed 7891570c1e4SChuck Lever * @copied: actual number of bytes received from the transport 7901570c1e4SChuck Lever * 7911570c1e4SChuck Lever * Caller holds transport lock. 7921570c1e4SChuck Lever */ 7931570c1e4SChuck Lever void xprt_complete_rqst(struct rpc_task *task, int copied) 7941570c1e4SChuck Lever { 7951570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 796fda13939STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 7971da177e4SLinus Torvalds 7981570c1e4SChuck Lever dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", 7991570c1e4SChuck Lever task->tk_pid, ntohl(req->rq_xid), copied); 8001da177e4SLinus Torvalds 801fda13939STrond Myklebust xprt->stat.recvs++; 802ef759a2eSChuck Lever task->tk_rtt = (long)jiffies - req->rq_xtime; 803ef759a2eSChuck Lever 8041da177e4SLinus Torvalds list_del_init(&req->rq_list); 8051e799b67STrond Myklebust req->rq_private_buf.len = copied; 80643ac3f29STrond Myklebust /* Ensure all writes are done before we update req->rq_received */ 80743ac3f29STrond Myklebust smp_wmb(); 8081e799b67STrond Myklebust req->rq_received = copied; 809fda13939STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, task); 8101da177e4SLinus Torvalds } 81112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_complete_rqst); 8121da177e4SLinus Torvalds 81346c0ee8bSChuck Lever static void xprt_timer(struct rpc_task *task) 8141da177e4SLinus Torvalds { 8151da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8161da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 8171da177e4SLinus Torvalds 8185d00837bSTrond Myklebust if (task->tk_status != -ETIMEDOUT) 8195d00837bSTrond Myklebust return; 82046121cf7SChuck Lever dprintk("RPC: %5u xprt_timer\n", task->tk_pid); 82146c0ee8bSChuck Lever 8225d00837bSTrond Myklebust spin_lock_bh(&xprt->transport_lock); 82346c0ee8bSChuck Lever if (!req->rq_received) { 82446c0ee8bSChuck Lever if (xprt->ops->timer) 82546c0ee8bSChuck Lever xprt->ops->timer(task); 8265d00837bSTrond Myklebust } else 8275d00837bSTrond Myklebust task->tk_status = 0; 8285d00837bSTrond Myklebust spin_unlock_bh(&xprt->transport_lock); 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8319903cd1cSChuck Lever /** 8329903cd1cSChuck Lever * xprt_prepare_transmit - reserve the transport before sending a request 8339903cd1cSChuck Lever * @task: RPC task about to send a request 8349903cd1cSChuck Lever * 8351da177e4SLinus Torvalds */ 8369903cd1cSChuck Lever int xprt_prepare_transmit(struct rpc_task *task) 8371da177e4SLinus Torvalds { 8381da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8391da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 8401da177e4SLinus Torvalds int err = 0; 8411da177e4SLinus Torvalds 84246121cf7SChuck Lever dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); 8431da177e4SLinus Torvalds 8444a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 8451da177e4SLinus Torvalds if (req->rq_received && !req->rq_bytes_sent) { 8461da177e4SLinus Torvalds err = req->rq_received; 8471da177e4SLinus Torvalds goto out_unlock; 8481da177e4SLinus Torvalds } 8492a491991STrond Myklebust if (!xprt->ops->reserve_xprt(task)) 8501da177e4SLinus Torvalds err = -EAGAIN; 8511da177e4SLinus Torvalds out_unlock: 8524a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 8531da177e4SLinus Torvalds return err; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 856e0ab53deSTrond Myklebust void xprt_end_transmit(struct rpc_task *task) 8575e5ce5beSTrond Myklebust { 858e0ab53deSTrond Myklebust xprt_release_write(task->tk_xprt, task); 8595e5ce5beSTrond Myklebust } 8605e5ce5beSTrond Myklebust 8619903cd1cSChuck Lever /** 8629903cd1cSChuck Lever * xprt_transmit - send an RPC request on a transport 8639903cd1cSChuck Lever * @task: controlling RPC task 8649903cd1cSChuck Lever * 8659903cd1cSChuck Lever * We have to copy the iovec because sendmsg fiddles with its contents. 8669903cd1cSChuck Lever */ 8679903cd1cSChuck Lever void xprt_transmit(struct rpc_task *task) 8681da177e4SLinus Torvalds { 8691da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8701da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 871a246b010SChuck Lever int status; 8721da177e4SLinus Torvalds 87346121cf7SChuck Lever dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds if (!req->rq_received) { 8761da177e4SLinus Torvalds if (list_empty(&req->rq_list)) { 8774a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 8781da177e4SLinus Torvalds /* Update the softirq receive buffer */ 8791da177e4SLinus Torvalds memcpy(&req->rq_private_buf, &req->rq_rcv_buf, 8801da177e4SLinus Torvalds sizeof(req->rq_private_buf)); 8811da177e4SLinus Torvalds /* Add request to the receive list */ 8821da177e4SLinus Torvalds list_add_tail(&req->rq_list, &xprt->recv); 8834a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 8841da177e4SLinus Torvalds xprt_reset_majortimeo(req); 8850f9dc2b1STrond Myklebust /* Turn off autodisconnect */ 8860f9dc2b1STrond Myklebust del_singleshot_timer_sync(&xprt->timer); 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds } else if (!req->rq_bytes_sent) 8891da177e4SLinus Torvalds return; 8901da177e4SLinus Torvalds 8917c1d71cfSTrond Myklebust req->rq_connect_cookie = xprt->connect_cookie; 892b22602a6SChuck Lever req->rq_xtime = jiffies; 893a246b010SChuck Lever status = xprt->ops->send_request(task); 894c8485e4dSTrond Myklebust if (status != 0) { 895c8485e4dSTrond Myklebust task->tk_status = status; 896c8485e4dSTrond Myklebust return; 897c8485e4dSTrond Myklebust } 898c8485e4dSTrond Myklebust 89946121cf7SChuck Lever dprintk("RPC: %5u xmit complete\n", task->tk_pid); 900fe3aca29SChuck Lever spin_lock_bh(&xprt->transport_lock); 901262ca07dSChuck Lever 902fe3aca29SChuck Lever xprt->ops->set_retrans_timeout(task); 903262ca07dSChuck Lever 904262ca07dSChuck Lever xprt->stat.sends++; 905262ca07dSChuck Lever xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; 906262ca07dSChuck Lever xprt->stat.bklog_u += xprt->backlog.qlen; 907262ca07dSChuck Lever 908fe3aca29SChuck Lever /* Don't race with disconnect */ 909fe3aca29SChuck Lever if (!xprt_connected(xprt)) 910fe3aca29SChuck Lever task->tk_status = -ENOTCONN; 911fe3aca29SChuck Lever else if (!req->rq_received) 9125d00837bSTrond Myklebust rpc_sleep_on(&xprt->pending, task, xprt_timer); 913fe3aca29SChuck Lever spin_unlock_bh(&xprt->transport_lock); 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9169903cd1cSChuck Lever static inline void do_xprt_reserve(struct rpc_task *task) 9171da177e4SLinus Torvalds { 9181da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds task->tk_status = 0; 9211da177e4SLinus Torvalds if (task->tk_rqstp) 9221da177e4SLinus Torvalds return; 9231da177e4SLinus Torvalds if (!list_empty(&xprt->free)) { 9241da177e4SLinus Torvalds struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); 9251da177e4SLinus Torvalds list_del_init(&req->rq_list); 9261da177e4SLinus Torvalds task->tk_rqstp = req; 9271da177e4SLinus Torvalds xprt_request_init(task, xprt); 9281da177e4SLinus Torvalds return; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds dprintk("RPC: waiting for request slot\n"); 9311da177e4SLinus Torvalds task->tk_status = -EAGAIN; 9321da177e4SLinus Torvalds task->tk_timeout = 0; 9335d00837bSTrond Myklebust rpc_sleep_on(&xprt->backlog, task, NULL); 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9369903cd1cSChuck Lever /** 9379903cd1cSChuck Lever * xprt_reserve - allocate an RPC request slot 9389903cd1cSChuck Lever * @task: RPC task requesting a slot allocation 9399903cd1cSChuck Lever * 9409903cd1cSChuck Lever * If no more slots are available, place the task on the transport's 9419903cd1cSChuck Lever * backlog queue. 9429903cd1cSChuck Lever */ 9439903cd1cSChuck Lever void xprt_reserve(struct rpc_task *task) 9441da177e4SLinus Torvalds { 9451da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds task->tk_status = -EIO; 9485dc07727SChuck Lever spin_lock(&xprt->reserve_lock); 9491da177e4SLinus Torvalds do_xprt_reserve(task); 9505dc07727SChuck Lever spin_unlock(&xprt->reserve_lock); 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 953d8ed029dSAlexey Dobriyan static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) 9541da177e4SLinus Torvalds { 9551da177e4SLinus Torvalds return xprt->xid++; 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds static inline void xprt_init_xid(struct rpc_xprt *xprt) 9591da177e4SLinus Torvalds { 960bf3fcf89SChuck Lever xprt->xid = net_random(); 9611da177e4SLinus Torvalds } 9621da177e4SLinus Torvalds 9639903cd1cSChuck Lever static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) 9641da177e4SLinus Torvalds { 9651da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 9661da177e4SLinus Torvalds 967ba7392bbSTrond Myklebust req->rq_timeout = task->tk_client->cl_timeout->to_initval; 9681da177e4SLinus Torvalds req->rq_task = task; 9691da177e4SLinus Torvalds req->rq_xprt = xprt; 97002107148SChuck Lever req->rq_buffer = NULL; 9711da177e4SLinus Torvalds req->rq_xid = xprt_alloc_xid(xprt); 972ead5e1c2SJ. Bruce Fields req->rq_release_snd_buf = NULL; 973da45828eSTrond Myklebust xprt_reset_majortimeo(req); 97446121cf7SChuck Lever dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, 9751da177e4SLinus Torvalds req, ntohl(req->rq_xid)); 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds 9789903cd1cSChuck Lever /** 9799903cd1cSChuck Lever * xprt_release - release an RPC request slot 9809903cd1cSChuck Lever * @task: task which is finished with the slot 9819903cd1cSChuck Lever * 9821da177e4SLinus Torvalds */ 9839903cd1cSChuck Lever void xprt_release(struct rpc_task *task) 9841da177e4SLinus Torvalds { 9851da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 9861da177e4SLinus Torvalds struct rpc_rqst *req; 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds if (!(req = task->tk_rqstp)) 9891da177e4SLinus Torvalds return; 99011c556b3SChuck Lever rpc_count_iostats(task); 9914a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 99249e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 993a58dd398SChuck Lever if (xprt->ops->release_request) 994a58dd398SChuck Lever xprt->ops->release_request(task); 9951da177e4SLinus Torvalds if (!list_empty(&req->rq_list)) 9961da177e4SLinus Torvalds list_del(&req->rq_list); 9971da177e4SLinus Torvalds xprt->last_used = jiffies; 9980065db32STrond Myklebust if (list_empty(&xprt->recv)) 999a246b010SChuck Lever mod_timer(&xprt->timer, 100003bf4b70SChuck Lever xprt->last_used + xprt->idle_timeout); 10014a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 1002c5a4dd8bSChuck Lever xprt->ops->buf_free(req->rq_buffer); 10031da177e4SLinus Torvalds task->tk_rqstp = NULL; 1004ead5e1c2SJ. Bruce Fields if (req->rq_release_snd_buf) 1005ead5e1c2SJ. Bruce Fields req->rq_release_snd_buf(req); 10061da177e4SLinus Torvalds memset(req, 0, sizeof(*req)); /* mark unused */ 10071da177e4SLinus Torvalds 100846121cf7SChuck Lever dprintk("RPC: %5u release request %p\n", task->tk_pid, req); 10091da177e4SLinus Torvalds 10105dc07727SChuck Lever spin_lock(&xprt->reserve_lock); 10111da177e4SLinus Torvalds list_add(&req->rq_list, &xprt->free); 1012555ee3afSChuck Lever rpc_wake_up_next(&xprt->backlog); 10135dc07727SChuck Lever spin_unlock(&xprt->reserve_lock); 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds 10169903cd1cSChuck Lever /** 1017c2866763SChuck Lever * xprt_create_transport - create an RPC transport 101896802a09SFrank van Maarseveen * @args: rpc transport creation arguments 1019c2866763SChuck Lever * 1020c2866763SChuck Lever */ 10213c341b0bS\"Talpey, Thomas\ struct rpc_xprt *xprt_create_transport(struct xprt_create *args) 1022c2866763SChuck Lever { 1023c2866763SChuck Lever struct rpc_xprt *xprt; 1024c2866763SChuck Lever struct rpc_rqst *req; 1025bc25571eS\"Talpey, Thomas\ struct xprt_class *t; 1026c2866763SChuck Lever 1027bc25571eS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 1028bc25571eS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 10294fa016ebS\"Talpey, Thomas\ if (t->ident == args->ident) { 1030bc25571eS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 1031bc25571eS\"Talpey, Thomas\ goto found; 1032c2866763SChuck Lever } 1033bc25571eS\"Talpey, Thomas\ } 1034bc25571eS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 10354fa016ebS\"Talpey, Thomas\ printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); 1036bc25571eS\"Talpey, Thomas\ return ERR_PTR(-EIO); 1037bc25571eS\"Talpey, Thomas\ 1038bc25571eS\"Talpey, Thomas\ found: 1039bc25571eS\"Talpey, Thomas\ xprt = t->setup(args); 1040c8541ecdSChuck Lever if (IS_ERR(xprt)) { 1041c8541ecdSChuck Lever dprintk("RPC: xprt_create_transport: failed, %ld\n", 1042c8541ecdSChuck Lever -PTR_ERR(xprt)); 1043c8541ecdSChuck Lever return xprt; 1044c2866763SChuck Lever } 1045c2866763SChuck Lever 10466b6ca86bSTrond Myklebust kref_init(&xprt->kref); 1047c2866763SChuck Lever spin_lock_init(&xprt->transport_lock); 1048c2866763SChuck Lever spin_lock_init(&xprt->reserve_lock); 1049c2866763SChuck Lever 1050c2866763SChuck Lever INIT_LIST_HEAD(&xprt->free); 1051c2866763SChuck Lever INIT_LIST_HEAD(&xprt->recv); 1052f9acac1aSRicardo Labiaga #if defined(CONFIG_NFS_V4_1) 1053f9acac1aSRicardo Labiaga spin_lock_init(&xprt->bc_pa_lock); 1054f9acac1aSRicardo Labiaga INIT_LIST_HEAD(&xprt->bc_pa_list); 1055f9acac1aSRicardo Labiaga #endif /* CONFIG_NFS_V4_1 */ 1056f9acac1aSRicardo Labiaga 105765f27f38SDavid Howells INIT_WORK(&xprt->task_cleanup, xprt_autoclose); 1058b24b8a24SPavel Emelyanov setup_timer(&xprt->timer, xprt_init_autodisconnect, 1059b24b8a24SPavel Emelyanov (unsigned long)xprt); 1060c2866763SChuck Lever xprt->last_used = jiffies; 1061c2866763SChuck Lever xprt->cwnd = RPC_INITCWND; 1062a509050bSChuck Lever xprt->bind_index = 0; 1063c2866763SChuck Lever 1064c2866763SChuck Lever rpc_init_wait_queue(&xprt->binding, "xprt_binding"); 1065c2866763SChuck Lever rpc_init_wait_queue(&xprt->pending, "xprt_pending"); 1066c2866763SChuck Lever rpc_init_wait_queue(&xprt->sending, "xprt_sending"); 1067c2866763SChuck Lever rpc_init_wait_queue(&xprt->resend, "xprt_resend"); 1068c2866763SChuck Lever rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); 1069c2866763SChuck Lever 1070c2866763SChuck Lever /* initialize free list */ 1071c2866763SChuck Lever for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) 1072c2866763SChuck Lever list_add(&req->rq_list, &xprt->free); 1073c2866763SChuck Lever 1074c2866763SChuck Lever xprt_init_xid(xprt); 1075c2866763SChuck Lever 1076c2866763SChuck Lever dprintk("RPC: created transport %p with %u slots\n", xprt, 1077c2866763SChuck Lever xprt->max_reqs); 1078c2866763SChuck Lever 1079c2866763SChuck Lever return xprt; 1080c2866763SChuck Lever } 1081c2866763SChuck Lever 10829903cd1cSChuck Lever /** 10839903cd1cSChuck Lever * xprt_destroy - destroy an RPC transport, killing off all requests. 10846b6ca86bSTrond Myklebust * @kref: kref for the transport to destroy 10859903cd1cSChuck Lever * 10861da177e4SLinus Torvalds */ 10876b6ca86bSTrond Myklebust static void xprt_destroy(struct kref *kref) 10881da177e4SLinus Torvalds { 10896b6ca86bSTrond Myklebust struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); 10906b6ca86bSTrond Myklebust 10911da177e4SLinus Torvalds dprintk("RPC: destroying transport %p\n", xprt); 10920065db32STrond Myklebust xprt->shutdown = 1; 10930065db32STrond Myklebust del_timer_sync(&xprt->timer); 1094c8541ecdSChuck Lever 1095f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->binding); 1096f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->pending); 1097f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->sending); 1098f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->resend); 1099f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->backlog); 1100c8541ecdSChuck Lever /* 1101c8541ecdSChuck Lever * Tear down transport state and free the rpc_xprt 1102c8541ecdSChuck Lever */ 1103a246b010SChuck Lever xprt->ops->destroy(xprt); 11046b6ca86bSTrond Myklebust } 11051da177e4SLinus Torvalds 11066b6ca86bSTrond Myklebust /** 11076b6ca86bSTrond Myklebust * xprt_put - release a reference to an RPC transport. 11086b6ca86bSTrond Myklebust * @xprt: pointer to the transport 11096b6ca86bSTrond Myklebust * 11106b6ca86bSTrond Myklebust */ 11116b6ca86bSTrond Myklebust void xprt_put(struct rpc_xprt *xprt) 11126b6ca86bSTrond Myklebust { 11136b6ca86bSTrond Myklebust kref_put(&xprt->kref, xprt_destroy); 11146b6ca86bSTrond Myklebust } 11156b6ca86bSTrond Myklebust 11166b6ca86bSTrond Myklebust /** 11176b6ca86bSTrond Myklebust * xprt_get - return a reference to an RPC transport. 11186b6ca86bSTrond Myklebust * @xprt: pointer to the transport 11196b6ca86bSTrond Myklebust * 11206b6ca86bSTrond Myklebust */ 11216b6ca86bSTrond Myklebust struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) 11226b6ca86bSTrond Myklebust { 11236b6ca86bSTrond Myklebust kref_get(&xprt->kref); 11246b6ca86bSTrond Myklebust return xprt; 11251da177e4SLinus Torvalds } 1126