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 1555ae1aabSRicardo Labiaga * transport's wait list. At the same time, if a reply is expected, 1655ae1aabSRicardo Labiaga * it installs a timer that is run after the packet's timeout has 1755ae1aabSRicardo Labiaga * expired. 181da177e4SLinus Torvalds * - When a packet arrives, the data_ready handler walks the list of 1955aa4f58SChuck Lever * pending requests for that transport. If a matching XID is found, the 201da177e4SLinus Torvalds * caller is woken up, and the timer removed. 211da177e4SLinus Torvalds * - When no reply arrives within the timeout interval, the timer is 221da177e4SLinus Torvalds * fired by the kernel and runs xprt_timer(). It either adjusts the 231da177e4SLinus Torvalds * timeout values (minor timeout) or wakes up the caller with a status 241da177e4SLinus Torvalds * of -ETIMEDOUT. 251da177e4SLinus Torvalds * - When the caller receives a notification from RPC that a reply arrived, 261da177e4SLinus Torvalds * it should release the RPC slot, and process the reply. 271da177e4SLinus Torvalds * If the call timed out, it may choose to retry the operation by 281da177e4SLinus Torvalds * adjusting the initial timeout value, and simply calling rpc_call 291da177e4SLinus Torvalds * again. 301da177e4SLinus Torvalds * 311da177e4SLinus Torvalds * Support for async RPC is done through a set of RPC-specific scheduling 321da177e4SLinus Torvalds * primitives that `transparently' work for processes as well as async 331da177e4SLinus Torvalds * tasks that rely on callbacks. 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> 3655aa4f58SChuck Lever * 3755aa4f58SChuck Lever * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> 381da177e4SLinus Torvalds */ 391da177e4SLinus Torvalds 40a246b010SChuck Lever #include <linux/module.h> 41a246b010SChuck Lever 421da177e4SLinus Torvalds #include <linux/types.h> 43a246b010SChuck Lever #include <linux/interrupt.h> 441da177e4SLinus Torvalds #include <linux/workqueue.h> 45bf3fcf89SChuck Lever #include <linux/net.h> 46ff839970SChuck Lever #include <linux/ktime.h> 471da177e4SLinus Torvalds 48a246b010SChuck Lever #include <linux/sunrpc/clnt.h> 4911c556b3SChuck Lever #include <linux/sunrpc/metrics.h> 50c9acb42eSTrond Myklebust #include <linux/sunrpc/bc_xprt.h> 511da177e4SLinus Torvalds 5255ae1aabSRicardo Labiaga #include "sunrpc.h" 5355ae1aabSRicardo Labiaga 541da177e4SLinus Torvalds /* 551da177e4SLinus Torvalds * Local variables 561da177e4SLinus Torvalds */ 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #ifdef RPC_DEBUG 591da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_XPRT 601da177e4SLinus Torvalds #endif 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds /* 631da177e4SLinus Torvalds * Local functions 641da177e4SLinus Torvalds */ 651da177e4SLinus Torvalds static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); 661da177e4SLinus Torvalds static void xprt_connect_status(struct rpc_task *task); 671da177e4SLinus Torvalds static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); 681da177e4SLinus Torvalds 695ba03e82SJiri Slaby static DEFINE_SPINLOCK(xprt_list_lock); 7081c098afS\"Talpey, Thomas\ static LIST_HEAD(xprt_list); 7181c098afS\"Talpey, Thomas\ 72555ee3afSChuck Lever /* 73555ee3afSChuck Lever * The transport code maintains an estimate on the maximum number of out- 74555ee3afSChuck Lever * standing RPC requests, using a smoothed version of the congestion 75555ee3afSChuck Lever * avoidance implemented in 44BSD. This is basically the Van Jacobson 76555ee3afSChuck Lever * congestion algorithm: If a retransmit occurs, the congestion window is 77555ee3afSChuck Lever * halved; otherwise, it is incremented by 1/cwnd when 78555ee3afSChuck Lever * 79555ee3afSChuck Lever * - a reply is received and 80555ee3afSChuck Lever * - a full number of requests are outstanding and 81555ee3afSChuck Lever * - the congestion window hasn't been updated recently. 82555ee3afSChuck Lever */ 83555ee3afSChuck Lever #define RPC_CWNDSHIFT (8U) 84555ee3afSChuck Lever #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) 85555ee3afSChuck Lever #define RPC_INITCWND RPC_CWNDSCALE 86555ee3afSChuck Lever #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) 87555ee3afSChuck Lever 88555ee3afSChuck Lever #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) 891da177e4SLinus Torvalds 9012a80469SChuck Lever /** 9181c098afS\"Talpey, Thomas\ * xprt_register_transport - register a transport implementation 9281c098afS\"Talpey, Thomas\ * @transport: transport to register 9381c098afS\"Talpey, Thomas\ * 9481c098afS\"Talpey, Thomas\ * If a transport implementation is loaded as a kernel module, it can 9581c098afS\"Talpey, Thomas\ * call this interface to make itself known to the RPC client. 9681c098afS\"Talpey, Thomas\ * 9781c098afS\"Talpey, Thomas\ * Returns: 9881c098afS\"Talpey, Thomas\ * 0: transport successfully registered 9981c098afS\"Talpey, Thomas\ * -EEXIST: transport already registered 10081c098afS\"Talpey, Thomas\ * -EINVAL: transport module being unloaded 10181c098afS\"Talpey, Thomas\ */ 10281c098afS\"Talpey, Thomas\ int xprt_register_transport(struct xprt_class *transport) 10381c098afS\"Talpey, Thomas\ { 10481c098afS\"Talpey, Thomas\ struct xprt_class *t; 10581c098afS\"Talpey, Thomas\ int result; 10681c098afS\"Talpey, Thomas\ 10781c098afS\"Talpey, Thomas\ result = -EEXIST; 10881c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 10981c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 11081c098afS\"Talpey, Thomas\ /* don't register the same transport class twice */ 1114fa016ebS\"Talpey, Thomas\ if (t->ident == transport->ident) 11281c098afS\"Talpey, Thomas\ goto out; 11381c098afS\"Talpey, Thomas\ } 11481c098afS\"Talpey, Thomas\ 11581c098afS\"Talpey, Thomas\ list_add_tail(&transport->list, &xprt_list); 11681c098afS\"Talpey, Thomas\ printk(KERN_INFO "RPC: Registered %s transport module.\n", 11781c098afS\"Talpey, Thomas\ transport->name); 11881c098afS\"Talpey, Thomas\ result = 0; 11981c098afS\"Talpey, Thomas\ 12081c098afS\"Talpey, Thomas\ out: 12181c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 12281c098afS\"Talpey, Thomas\ return result; 12381c098afS\"Talpey, Thomas\ } 12481c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_register_transport); 12581c098afS\"Talpey, Thomas\ 12681c098afS\"Talpey, Thomas\ /** 12781c098afS\"Talpey, Thomas\ * xprt_unregister_transport - unregister a transport implementation 12865b6e42cSRandy Dunlap * @transport: transport to unregister 12981c098afS\"Talpey, Thomas\ * 13081c098afS\"Talpey, Thomas\ * Returns: 13181c098afS\"Talpey, Thomas\ * 0: transport successfully unregistered 13281c098afS\"Talpey, Thomas\ * -ENOENT: transport never registered 13381c098afS\"Talpey, Thomas\ */ 13481c098afS\"Talpey, Thomas\ int xprt_unregister_transport(struct xprt_class *transport) 13581c098afS\"Talpey, Thomas\ { 13681c098afS\"Talpey, Thomas\ struct xprt_class *t; 13781c098afS\"Talpey, Thomas\ int result; 13881c098afS\"Talpey, Thomas\ 13981c098afS\"Talpey, Thomas\ result = 0; 14081c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 14181c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 14281c098afS\"Talpey, Thomas\ if (t == transport) { 14381c098afS\"Talpey, Thomas\ printk(KERN_INFO 14481c098afS\"Talpey, Thomas\ "RPC: Unregistered %s transport module.\n", 14581c098afS\"Talpey, Thomas\ transport->name); 14681c098afS\"Talpey, Thomas\ list_del_init(&transport->list); 14781c098afS\"Talpey, Thomas\ goto out; 14881c098afS\"Talpey, Thomas\ } 14981c098afS\"Talpey, Thomas\ } 15081c098afS\"Talpey, Thomas\ result = -ENOENT; 15181c098afS\"Talpey, Thomas\ 15281c098afS\"Talpey, Thomas\ out: 15381c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 15481c098afS\"Talpey, Thomas\ return result; 15581c098afS\"Talpey, Thomas\ } 15681c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_unregister_transport); 15781c098afS\"Talpey, Thomas\ 15881c098afS\"Talpey, Thomas\ /** 159441e3e24STom Talpey * xprt_load_transport - load a transport implementation 160441e3e24STom Talpey * @transport_name: transport to load 161441e3e24STom Talpey * 162441e3e24STom Talpey * Returns: 163441e3e24STom Talpey * 0: transport successfully loaded 164441e3e24STom Talpey * -ENOENT: transport module not available 165441e3e24STom Talpey */ 166441e3e24STom Talpey int xprt_load_transport(const char *transport_name) 167441e3e24STom Talpey { 168441e3e24STom Talpey struct xprt_class *t; 169441e3e24STom Talpey int result; 170441e3e24STom Talpey 171441e3e24STom Talpey result = 0; 172441e3e24STom Talpey spin_lock(&xprt_list_lock); 173441e3e24STom Talpey list_for_each_entry(t, &xprt_list, list) { 174441e3e24STom Talpey if (strcmp(t->name, transport_name) == 0) { 175441e3e24STom Talpey spin_unlock(&xprt_list_lock); 176441e3e24STom Talpey goto out; 177441e3e24STom Talpey } 178441e3e24STom Talpey } 179441e3e24STom Talpey spin_unlock(&xprt_list_lock); 180ef7ffe8fSAlex Riesen result = request_module("xprt%s", transport_name); 181441e3e24STom Talpey out: 182441e3e24STom Talpey return result; 183441e3e24STom Talpey } 184441e3e24STom Talpey EXPORT_SYMBOL_GPL(xprt_load_transport); 185441e3e24STom Talpey 186441e3e24STom Talpey /** 18712a80469SChuck Lever * xprt_reserve_xprt - serialize write access to transports 18812a80469SChuck Lever * @task: task that is requesting access to the transport 18912a80469SChuck Lever * 19012a80469SChuck Lever * This prevents mixing the payload of separate requests, and prevents 19112a80469SChuck Lever * transport connects from colliding with writes. No congestion control 19212a80469SChuck Lever * is provided. 1931da177e4SLinus Torvalds */ 19412a80469SChuck Lever int xprt_reserve_xprt(struct rpc_task *task) 1951da177e4SLinus Torvalds { 19612a80469SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 197343952faSRahul Iyer struct rpc_xprt *xprt = req->rq_xprt; 19812a80469SChuck Lever 19912a80469SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 20012a80469SChuck Lever if (task == xprt->snd_task) 20112a80469SChuck Lever return 1; 20212a80469SChuck Lever if (task == NULL) 20312a80469SChuck Lever return 0; 20412a80469SChuck Lever goto out_sleep; 20512a80469SChuck Lever } 20612a80469SChuck Lever xprt->snd_task = task; 20712a80469SChuck Lever if (req) { 20812a80469SChuck Lever req->rq_bytes_sent = 0; 20912a80469SChuck Lever req->rq_ntrans++; 21012a80469SChuck Lever } 21112a80469SChuck Lever return 1; 21212a80469SChuck Lever 21312a80469SChuck Lever out_sleep: 21446121cf7SChuck Lever dprintk("RPC: %5u failed to lock transport %p\n", 21512a80469SChuck Lever task->tk_pid, xprt); 21612a80469SChuck Lever task->tk_timeout = 0; 21712a80469SChuck Lever task->tk_status = -EAGAIN; 21812a80469SChuck Lever if (req && req->rq_ntrans) 2195d00837bSTrond Myklebust rpc_sleep_on(&xprt->resend, task, NULL); 22012a80469SChuck Lever else 2215d00837bSTrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 22212a80469SChuck Lever return 0; 22312a80469SChuck Lever } 22412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt); 22512a80469SChuck Lever 226632e3bdcSTrond Myklebust static void xprt_clear_locked(struct rpc_xprt *xprt) 227632e3bdcSTrond Myklebust { 228632e3bdcSTrond Myklebust xprt->snd_task = NULL; 229632e3bdcSTrond Myklebust if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { 230632e3bdcSTrond Myklebust smp_mb__before_clear_bit(); 231632e3bdcSTrond Myklebust clear_bit(XPRT_LOCKED, &xprt->state); 232632e3bdcSTrond Myklebust smp_mb__after_clear_bit(); 233632e3bdcSTrond Myklebust } else 234c1384c9cSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 235632e3bdcSTrond Myklebust } 236632e3bdcSTrond Myklebust 23712a80469SChuck Lever /* 23812a80469SChuck Lever * xprt_reserve_xprt_cong - serialize write access to transports 23912a80469SChuck Lever * @task: task that is requesting access to the transport 24012a80469SChuck Lever * 24112a80469SChuck Lever * Same as xprt_reserve_xprt, but Van Jacobson congestion control is 24212a80469SChuck Lever * integrated into the decision of whether a request is allowed to be 24312a80469SChuck Lever * woken up and given access to the transport. 24412a80469SChuck Lever */ 24512a80469SChuck Lever int xprt_reserve_xprt_cong(struct rpc_task *task) 24612a80469SChuck Lever { 24712a80469SChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 2481da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 2491da177e4SLinus Torvalds 2502226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 2511da177e4SLinus Torvalds if (task == xprt->snd_task) 2521da177e4SLinus Torvalds return 1; 2531da177e4SLinus Torvalds goto out_sleep; 2541da177e4SLinus Torvalds } 25512a80469SChuck Lever if (__xprt_get_cong(xprt, task)) { 2561da177e4SLinus Torvalds xprt->snd_task = task; 2571da177e4SLinus Torvalds if (req) { 2581da177e4SLinus Torvalds req->rq_bytes_sent = 0; 2591da177e4SLinus Torvalds req->rq_ntrans++; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds return 1; 2621da177e4SLinus Torvalds } 263632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 2641da177e4SLinus Torvalds out_sleep: 26546121cf7SChuck Lever dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); 2661da177e4SLinus Torvalds task->tk_timeout = 0; 2671da177e4SLinus Torvalds task->tk_status = -EAGAIN; 2681da177e4SLinus Torvalds if (req && req->rq_ntrans) 2695d00837bSTrond Myklebust rpc_sleep_on(&xprt->resend, task, NULL); 2701da177e4SLinus Torvalds else 2715d00837bSTrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 2721da177e4SLinus Torvalds return 0; 2731da177e4SLinus Torvalds } 27412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); 2751da177e4SLinus Torvalds 27612a80469SChuck Lever static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds int retval; 2791da177e4SLinus Torvalds 2804a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 28112a80469SChuck Lever retval = xprt->ops->reserve_xprt(task); 2824a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 2831da177e4SLinus Torvalds return retval; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 28612a80469SChuck Lever static void __xprt_lock_write_next(struct rpc_xprt *xprt) 2871da177e4SLinus Torvalds { 2881da177e4SLinus Torvalds struct rpc_task *task; 28949e9a890SChuck Lever struct rpc_rqst *req; 29049e9a890SChuck Lever 29149e9a890SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 29249e9a890SChuck Lever return; 29349e9a890SChuck Lever 29449e9a890SChuck Lever task = rpc_wake_up_next(&xprt->resend); 29549e9a890SChuck Lever if (!task) { 29649e9a890SChuck Lever task = rpc_wake_up_next(&xprt->sending); 29749e9a890SChuck Lever if (!task) 29849e9a890SChuck Lever goto out_unlock; 29949e9a890SChuck Lever } 30049e9a890SChuck Lever 30149e9a890SChuck Lever req = task->tk_rqstp; 30249e9a890SChuck Lever xprt->snd_task = task; 30349e9a890SChuck Lever if (req) { 30449e9a890SChuck Lever req->rq_bytes_sent = 0; 30549e9a890SChuck Lever req->rq_ntrans++; 30649e9a890SChuck Lever } 30749e9a890SChuck Lever return; 30849e9a890SChuck Lever 30949e9a890SChuck Lever out_unlock: 310632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 31149e9a890SChuck Lever } 31249e9a890SChuck Lever 31349e9a890SChuck Lever static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) 31449e9a890SChuck Lever { 31549e9a890SChuck Lever struct rpc_task *task; 3161da177e4SLinus Torvalds 3172226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 3181da177e4SLinus Torvalds return; 31949e9a890SChuck Lever if (RPCXPRT_CONGESTED(xprt)) 3201da177e4SLinus Torvalds goto out_unlock; 3211da177e4SLinus Torvalds task = rpc_wake_up_next(&xprt->resend); 3221da177e4SLinus Torvalds if (!task) { 3231da177e4SLinus Torvalds task = rpc_wake_up_next(&xprt->sending); 3241da177e4SLinus Torvalds if (!task) 3251da177e4SLinus Torvalds goto out_unlock; 3261da177e4SLinus Torvalds } 32749e9a890SChuck Lever if (__xprt_get_cong(xprt, task)) { 3281da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 3291da177e4SLinus Torvalds xprt->snd_task = task; 3301da177e4SLinus Torvalds if (req) { 3311da177e4SLinus Torvalds req->rq_bytes_sent = 0; 3321da177e4SLinus Torvalds req->rq_ntrans++; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds return; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds out_unlock: 337632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 34049e9a890SChuck Lever /** 34149e9a890SChuck Lever * xprt_release_xprt - allow other requests to use a transport 34249e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 34349e9a890SChuck Lever * @task: task that is releasing access to the transport 34449e9a890SChuck Lever * 34549e9a890SChuck Lever * Note that "task" can be NULL. No congestion control is provided. 3461da177e4SLinus Torvalds */ 34749e9a890SChuck Lever void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 3481da177e4SLinus Torvalds { 3491da177e4SLinus Torvalds if (xprt->snd_task == task) { 350632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 3511da177e4SLinus Torvalds __xprt_lock_write_next(xprt); 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds } 35412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt); 3551da177e4SLinus Torvalds 35649e9a890SChuck Lever /** 35749e9a890SChuck Lever * xprt_release_xprt_cong - allow other requests to use a transport 35849e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 35949e9a890SChuck Lever * @task: task that is releasing access to the transport 36049e9a890SChuck Lever * 36149e9a890SChuck Lever * Note that "task" can be NULL. Another task is awoken to use the 36249e9a890SChuck Lever * transport if the transport's congestion window allows it. 36349e9a890SChuck Lever */ 36449e9a890SChuck Lever void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) 36549e9a890SChuck Lever { 36649e9a890SChuck Lever if (xprt->snd_task == task) { 367632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 36849e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 36949e9a890SChuck Lever } 37049e9a890SChuck Lever } 37112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); 37249e9a890SChuck Lever 37349e9a890SChuck Lever static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) 3741da177e4SLinus Torvalds { 3754a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 37649e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 3774a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* 3811da177e4SLinus Torvalds * Van Jacobson congestion avoidance. Check if the congestion window 3821da177e4SLinus Torvalds * overflowed. Put the task to sleep if this is the case. 3831da177e4SLinus Torvalds */ 3841da177e4SLinus Torvalds static int 3851da177e4SLinus Torvalds __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) 3861da177e4SLinus Torvalds { 3871da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds if (req->rq_cong) 3901da177e4SLinus Torvalds return 1; 39146121cf7SChuck Lever dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", 3921da177e4SLinus Torvalds task->tk_pid, xprt->cong, xprt->cwnd); 3931da177e4SLinus Torvalds if (RPCXPRT_CONGESTED(xprt)) 3941da177e4SLinus Torvalds return 0; 3951da177e4SLinus Torvalds req->rq_cong = 1; 3961da177e4SLinus Torvalds xprt->cong += RPC_CWNDSCALE; 3971da177e4SLinus Torvalds return 1; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* 4011da177e4SLinus Torvalds * Adjust the congestion window, and wake up the next task 4021da177e4SLinus Torvalds * that has been sleeping due to congestion 4031da177e4SLinus Torvalds */ 4041da177e4SLinus Torvalds static void 4051da177e4SLinus Torvalds __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) 4061da177e4SLinus Torvalds { 4071da177e4SLinus Torvalds if (!req->rq_cong) 4081da177e4SLinus Torvalds return; 4091da177e4SLinus Torvalds req->rq_cong = 0; 4101da177e4SLinus Torvalds xprt->cong -= RPC_CWNDSCALE; 41149e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 41446c0ee8bSChuck Lever /** 415a58dd398SChuck Lever * xprt_release_rqst_cong - housekeeping when request is complete 416a58dd398SChuck Lever * @task: RPC request that recently completed 417a58dd398SChuck Lever * 418a58dd398SChuck Lever * Useful for transports that require congestion control. 419a58dd398SChuck Lever */ 420a58dd398SChuck Lever void xprt_release_rqst_cong(struct rpc_task *task) 421a58dd398SChuck Lever { 422a58dd398SChuck Lever __xprt_put_cong(task->tk_xprt, task->tk_rqstp); 423a58dd398SChuck Lever } 42412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); 425a58dd398SChuck Lever 426a58dd398SChuck Lever /** 42746c0ee8bSChuck Lever * xprt_adjust_cwnd - adjust transport congestion window 42846c0ee8bSChuck Lever * @task: recently completed RPC request used to adjust window 42946c0ee8bSChuck Lever * @result: result code of completed RPC request 43046c0ee8bSChuck Lever * 4311da177e4SLinus Torvalds * We use a time-smoothed congestion estimator to avoid heavy oscillation. 4321da177e4SLinus Torvalds */ 43346c0ee8bSChuck Lever void xprt_adjust_cwnd(struct rpc_task *task, int result) 4341da177e4SLinus Torvalds { 43546c0ee8bSChuck Lever struct rpc_rqst *req = task->tk_rqstp; 43646c0ee8bSChuck Lever struct rpc_xprt *xprt = task->tk_xprt; 43746c0ee8bSChuck Lever unsigned long cwnd = xprt->cwnd; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds if (result >= 0 && cwnd <= xprt->cong) { 4401da177e4SLinus Torvalds /* The (cwnd >> 1) term makes sure 4411da177e4SLinus Torvalds * the result gets rounded properly. */ 4421da177e4SLinus Torvalds cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; 4431da177e4SLinus Torvalds if (cwnd > RPC_MAXCWND(xprt)) 4441da177e4SLinus Torvalds cwnd = RPC_MAXCWND(xprt); 44549e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 4461da177e4SLinus Torvalds } else if (result == -ETIMEDOUT) { 4471da177e4SLinus Torvalds cwnd >>= 1; 4481da177e4SLinus Torvalds if (cwnd < RPC_CWNDSCALE) 4491da177e4SLinus Torvalds cwnd = RPC_CWNDSCALE; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", 4521da177e4SLinus Torvalds xprt->cong, xprt->cwnd, cwnd); 4531da177e4SLinus Torvalds xprt->cwnd = cwnd; 45446c0ee8bSChuck Lever __xprt_put_cong(xprt, req); 4551da177e4SLinus Torvalds } 45612444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); 4571da177e4SLinus Torvalds 45844fbac22SChuck Lever /** 45944fbac22SChuck Lever * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue 46044fbac22SChuck Lever * @xprt: transport with waiting tasks 46144fbac22SChuck Lever * @status: result code to plant in each task before waking it 46244fbac22SChuck Lever * 46344fbac22SChuck Lever */ 46444fbac22SChuck Lever void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) 46544fbac22SChuck Lever { 46644fbac22SChuck Lever if (status < 0) 46744fbac22SChuck Lever rpc_wake_up_status(&xprt->pending, status); 46844fbac22SChuck Lever else 46944fbac22SChuck Lever rpc_wake_up(&xprt->pending); 47044fbac22SChuck Lever } 47112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); 47244fbac22SChuck Lever 473c7b2cae8SChuck Lever /** 474c7b2cae8SChuck Lever * xprt_wait_for_buffer_space - wait for transport output buffer to clear 475c7b2cae8SChuck Lever * @task: task to be put to sleep 4760b80ae42SRandy Dunlap * @action: function pointer to be executed after wait 477c7b2cae8SChuck Lever */ 478b6ddf64fSTrond Myklebust void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) 479c7b2cae8SChuck Lever { 480c7b2cae8SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 481c7b2cae8SChuck Lever struct rpc_xprt *xprt = req->rq_xprt; 482c7b2cae8SChuck Lever 483c7b2cae8SChuck Lever task->tk_timeout = req->rq_timeout; 484b6ddf64fSTrond Myklebust rpc_sleep_on(&xprt->pending, task, action); 485c7b2cae8SChuck Lever } 48612444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); 487c7b2cae8SChuck Lever 488c7b2cae8SChuck Lever /** 489c7b2cae8SChuck Lever * xprt_write_space - wake the task waiting for transport output buffer space 490c7b2cae8SChuck Lever * @xprt: transport with waiting tasks 491c7b2cae8SChuck Lever * 492c7b2cae8SChuck Lever * Can be called in a soft IRQ context, so xprt_write_space never sleeps. 493c7b2cae8SChuck Lever */ 494c7b2cae8SChuck Lever void xprt_write_space(struct rpc_xprt *xprt) 495c7b2cae8SChuck Lever { 496c7b2cae8SChuck Lever if (unlikely(xprt->shutdown)) 497c7b2cae8SChuck Lever return; 498c7b2cae8SChuck Lever 499c7b2cae8SChuck Lever spin_lock_bh(&xprt->transport_lock); 500c7b2cae8SChuck Lever if (xprt->snd_task) { 50146121cf7SChuck Lever dprintk("RPC: write space: waking waiting task on " 50246121cf7SChuck Lever "xprt %p\n", xprt); 503fda13939STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); 504c7b2cae8SChuck Lever } 505c7b2cae8SChuck Lever spin_unlock_bh(&xprt->transport_lock); 506c7b2cae8SChuck Lever } 50712444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_write_space); 508c7b2cae8SChuck Lever 509fe3aca29SChuck Lever /** 510fe3aca29SChuck Lever * xprt_set_retrans_timeout_def - set a request's retransmit timeout 511fe3aca29SChuck Lever * @task: task whose timeout is to be set 512fe3aca29SChuck Lever * 513fe3aca29SChuck Lever * Set a request's retransmit timeout based on the transport's 514fe3aca29SChuck Lever * default timeout parameters. Used by transports that don't adjust 515fe3aca29SChuck Lever * the retransmit timeout based on round-trip time estimation. 516fe3aca29SChuck Lever */ 517fe3aca29SChuck Lever void xprt_set_retrans_timeout_def(struct rpc_task *task) 518fe3aca29SChuck Lever { 519fe3aca29SChuck Lever task->tk_timeout = task->tk_rqstp->rq_timeout; 520fe3aca29SChuck Lever } 52112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); 522fe3aca29SChuck Lever 523fe3aca29SChuck Lever /* 524fe3aca29SChuck Lever * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout 525fe3aca29SChuck Lever * @task: task whose timeout is to be set 526fe3aca29SChuck Lever * 527fe3aca29SChuck Lever * Set a request's retransmit timeout using the RTT estimator. 528fe3aca29SChuck Lever */ 529fe3aca29SChuck Lever void xprt_set_retrans_timeout_rtt(struct rpc_task *task) 530fe3aca29SChuck Lever { 531fe3aca29SChuck Lever int timer = task->tk_msg.rpc_proc->p_timer; 532ba7392bbSTrond Myklebust struct rpc_clnt *clnt = task->tk_client; 533ba7392bbSTrond Myklebust struct rpc_rtt *rtt = clnt->cl_rtt; 534fe3aca29SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 535ba7392bbSTrond Myklebust unsigned long max_timeout = clnt->cl_timeout->to_maxval; 536fe3aca29SChuck Lever 537fe3aca29SChuck Lever task->tk_timeout = rpc_calc_rto(rtt, timer); 538fe3aca29SChuck Lever task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; 539fe3aca29SChuck Lever if (task->tk_timeout > max_timeout || task->tk_timeout == 0) 540fe3aca29SChuck Lever task->tk_timeout = max_timeout; 541fe3aca29SChuck Lever } 54212444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); 543fe3aca29SChuck Lever 5441da177e4SLinus Torvalds static void xprt_reset_majortimeo(struct rpc_rqst *req) 5451da177e4SLinus Torvalds { 546ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds req->rq_majortimeo = req->rq_timeout; 5491da177e4SLinus Torvalds if (to->to_exponential) 5501da177e4SLinus Torvalds req->rq_majortimeo <<= to->to_retries; 5511da177e4SLinus Torvalds else 5521da177e4SLinus Torvalds req->rq_majortimeo += to->to_increment * to->to_retries; 5531da177e4SLinus Torvalds if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) 5541da177e4SLinus Torvalds req->rq_majortimeo = to->to_maxval; 5551da177e4SLinus Torvalds req->rq_majortimeo += jiffies; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5589903cd1cSChuck Lever /** 5599903cd1cSChuck Lever * xprt_adjust_timeout - adjust timeout values for next retransmit 5609903cd1cSChuck Lever * @req: RPC request containing parameters to use for the adjustment 5619903cd1cSChuck Lever * 5621da177e4SLinus Torvalds */ 5631da177e4SLinus Torvalds int xprt_adjust_timeout(struct rpc_rqst *req) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 566ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 5671da177e4SLinus Torvalds int status = 0; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds if (time_before(jiffies, req->rq_majortimeo)) { 5701da177e4SLinus Torvalds if (to->to_exponential) 5711da177e4SLinus Torvalds req->rq_timeout <<= 1; 5721da177e4SLinus Torvalds else 5731da177e4SLinus Torvalds req->rq_timeout += to->to_increment; 5741da177e4SLinus Torvalds if (to->to_maxval && req->rq_timeout >= to->to_maxval) 5751da177e4SLinus Torvalds req->rq_timeout = to->to_maxval; 5761da177e4SLinus Torvalds req->rq_retries++; 5771da177e4SLinus Torvalds } else { 5781da177e4SLinus Torvalds req->rq_timeout = to->to_initval; 5791da177e4SLinus Torvalds req->rq_retries = 0; 5801da177e4SLinus Torvalds xprt_reset_majortimeo(req); 5811da177e4SLinus Torvalds /* Reset the RTT counters == "slow start" */ 5824a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 5831da177e4SLinus Torvalds rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); 5844a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 5851da177e4SLinus Torvalds status = -ETIMEDOUT; 5861da177e4SLinus Torvalds } 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds if (req->rq_timeout == 0) { 5891da177e4SLinus Torvalds printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); 5901da177e4SLinus Torvalds req->rq_timeout = 5 * HZ; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds return status; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 59565f27f38SDavid Howells static void xprt_autoclose(struct work_struct *work) 5961da177e4SLinus Torvalds { 59765f27f38SDavid Howells struct rpc_xprt *xprt = 59865f27f38SDavid Howells container_of(work, struct rpc_xprt, task_cleanup); 5991da177e4SLinus Torvalds 600a246b010SChuck Lever xprt->ops->close(xprt); 60166af1e55STrond Myklebust clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 6021da177e4SLinus Torvalds xprt_release_write(xprt, NULL); 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6059903cd1cSChuck Lever /** 60662da3b24STrond Myklebust * xprt_disconnect_done - mark a transport as disconnected 6079903cd1cSChuck Lever * @xprt: transport to flag for disconnect 6089903cd1cSChuck Lever * 6091da177e4SLinus Torvalds */ 61062da3b24STrond Myklebust void xprt_disconnect_done(struct rpc_xprt *xprt) 6111da177e4SLinus Torvalds { 6121da177e4SLinus Torvalds dprintk("RPC: disconnected transport %p\n", xprt); 6134a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 6141da177e4SLinus Torvalds xprt_clear_connected(xprt); 6152a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 6164a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 6171da177e4SLinus Torvalds } 61862da3b24STrond Myklebust EXPORT_SYMBOL_GPL(xprt_disconnect_done); 6191da177e4SLinus Torvalds 62066af1e55STrond Myklebust /** 62166af1e55STrond Myklebust * xprt_force_disconnect - force a transport to disconnect 62266af1e55STrond Myklebust * @xprt: transport to disconnect 62366af1e55STrond Myklebust * 62466af1e55STrond Myklebust */ 62566af1e55STrond Myklebust void xprt_force_disconnect(struct rpc_xprt *xprt) 62666af1e55STrond Myklebust { 62766af1e55STrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 62866af1e55STrond Myklebust spin_lock_bh(&xprt->transport_lock); 62966af1e55STrond Myklebust set_bit(XPRT_CLOSE_WAIT, &xprt->state); 63066af1e55STrond Myklebust /* Try to schedule an autoclose RPC call */ 63166af1e55STrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 63266af1e55STrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6332a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 63466af1e55STrond Myklebust spin_unlock_bh(&xprt->transport_lock); 63566af1e55STrond Myklebust } 63666af1e55STrond Myklebust 6377c1d71cfSTrond Myklebust /** 6387c1d71cfSTrond Myklebust * xprt_conditional_disconnect - force a transport to disconnect 6397c1d71cfSTrond Myklebust * @xprt: transport to disconnect 6407c1d71cfSTrond Myklebust * @cookie: 'connection cookie' 6417c1d71cfSTrond Myklebust * 6427c1d71cfSTrond Myklebust * This attempts to break the connection if and only if 'cookie' matches 6437c1d71cfSTrond Myklebust * the current transport 'connection cookie'. It ensures that we don't 6447c1d71cfSTrond Myklebust * try to break the connection more than once when we need to retransmit 6457c1d71cfSTrond Myklebust * a batch of RPC requests. 6467c1d71cfSTrond Myklebust * 6477c1d71cfSTrond Myklebust */ 6487c1d71cfSTrond Myklebust void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) 6497c1d71cfSTrond Myklebust { 6507c1d71cfSTrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 6517c1d71cfSTrond Myklebust spin_lock_bh(&xprt->transport_lock); 6527c1d71cfSTrond Myklebust if (cookie != xprt->connect_cookie) 6537c1d71cfSTrond Myklebust goto out; 6547c1d71cfSTrond Myklebust if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) 6557c1d71cfSTrond Myklebust goto out; 6567c1d71cfSTrond Myklebust set_bit(XPRT_CLOSE_WAIT, &xprt->state); 6577c1d71cfSTrond Myklebust /* Try to schedule an autoclose RPC call */ 6587c1d71cfSTrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 6597c1d71cfSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6602a491991STrond Myklebust xprt_wake_pending_tasks(xprt, -EAGAIN); 6617c1d71cfSTrond Myklebust out: 6627c1d71cfSTrond Myklebust spin_unlock_bh(&xprt->transport_lock); 6637c1d71cfSTrond Myklebust } 6647c1d71cfSTrond Myklebust 6651da177e4SLinus Torvalds static void 6661da177e4SLinus Torvalds xprt_init_autodisconnect(unsigned long data) 6671da177e4SLinus Torvalds { 6681da177e4SLinus Torvalds struct rpc_xprt *xprt = (struct rpc_xprt *)data; 6691da177e4SLinus Torvalds 6704a0f8c04SChuck Lever spin_lock(&xprt->transport_lock); 6711da177e4SLinus Torvalds if (!list_empty(&xprt->recv) || xprt->shutdown) 6721da177e4SLinus Torvalds goto out_abort; 6732226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 6741da177e4SLinus Torvalds goto out_abort; 6754a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 676f75e6745STrond Myklebust set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 677c1384c9cSTrond Myklebust queue_work(rpciod_workqueue, &xprt->task_cleanup); 6781da177e4SLinus Torvalds return; 6791da177e4SLinus Torvalds out_abort: 6804a0f8c04SChuck Lever spin_unlock(&xprt->transport_lock); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6839903cd1cSChuck Lever /** 6849903cd1cSChuck Lever * xprt_connect - schedule a transport connect operation 6859903cd1cSChuck Lever * @task: RPC task that is requesting the connect 6861da177e4SLinus Torvalds * 6871da177e4SLinus Torvalds */ 6881da177e4SLinus Torvalds void xprt_connect(struct rpc_task *task) 6891da177e4SLinus Torvalds { 6901da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 6911da177e4SLinus Torvalds 69246121cf7SChuck Lever dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, 6931da177e4SLinus Torvalds xprt, (xprt_connected(xprt) ? "is" : "is not")); 6941da177e4SLinus Torvalds 695ec739ef0SChuck Lever if (!xprt_bound(xprt)) { 69601d37c42STrond Myklebust task->tk_status = -EAGAIN; 6971da177e4SLinus Torvalds return; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds if (!xprt_lock_write(xprt, task)) 7001da177e4SLinus Torvalds return; 701feb8ca37STrond Myklebust 702feb8ca37STrond Myklebust if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) 703feb8ca37STrond Myklebust xprt->ops->close(xprt); 704feb8ca37STrond Myklebust 7051da177e4SLinus Torvalds if (xprt_connected(xprt)) 706a246b010SChuck Lever xprt_release_write(xprt, task); 707a246b010SChuck Lever else { 7081da177e4SLinus Torvalds if (task->tk_rqstp) 7091da177e4SLinus Torvalds task->tk_rqstp->rq_bytes_sent = 0; 7101da177e4SLinus Torvalds 711a8ce4a8fSTrond Myklebust task->tk_timeout = task->tk_rqstp->rq_timeout; 7125d00837bSTrond Myklebust rpc_sleep_on(&xprt->pending, task, xprt_connect_status); 7130b9e7943STrond Myklebust 7140b9e7943STrond Myklebust if (test_bit(XPRT_CLOSING, &xprt->state)) 7150b9e7943STrond Myklebust return; 7160b9e7943STrond Myklebust if (xprt_test_and_set_connecting(xprt)) 7170b9e7943STrond Myklebust return; 718262ca07dSChuck Lever xprt->stat.connect_start = jiffies; 719a246b010SChuck Lever xprt->ops->connect(task); 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 7239903cd1cSChuck Lever static void xprt_connect_status(struct rpc_task *task) 7241da177e4SLinus Torvalds { 7251da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 7261da177e4SLinus Torvalds 727cd983ef8SChuck Lever if (task->tk_status == 0) { 728262ca07dSChuck Lever xprt->stat.connect_count++; 729262ca07dSChuck Lever xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; 73046121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: connection established\n", 7311da177e4SLinus Torvalds task->tk_pid); 7321da177e4SLinus Torvalds return; 7331da177e4SLinus Torvalds } 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds switch (task->tk_status) { 7362a491991STrond Myklebust case -EAGAIN: 7372a491991STrond Myklebust dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); 73823475d66SChuck Lever break; 7391da177e4SLinus Torvalds case -ETIMEDOUT: 74046121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: connect attempt timed " 74146121cf7SChuck Lever "out\n", task->tk_pid); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds default: 74446121cf7SChuck Lever dprintk("RPC: %5u xprt_connect_status: error %d connecting to " 74546121cf7SChuck Lever "server %s\n", task->tk_pid, -task->tk_status, 74646121cf7SChuck Lever task->tk_client->cl_server); 7471da177e4SLinus Torvalds xprt_release_write(xprt, task); 74823475d66SChuck Lever task->tk_status = -EIO; 74923475d66SChuck Lever } 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7529903cd1cSChuck Lever /** 7539903cd1cSChuck Lever * xprt_lookup_rqst - find an RPC request corresponding to an XID 7549903cd1cSChuck Lever * @xprt: transport on which the original request was transmitted 7559903cd1cSChuck Lever * @xid: RPC XID of incoming reply 7569903cd1cSChuck Lever * 7571da177e4SLinus Torvalds */ 758d8ed029dSAlexey Dobriyan struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds struct list_head *pos; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds list_for_each(pos, &xprt->recv) { 7631da177e4SLinus Torvalds struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); 764262ca07dSChuck Lever if (entry->rq_xid == xid) 765262ca07dSChuck Lever return entry; 7661da177e4SLinus Torvalds } 76746121cf7SChuck Lever 76846121cf7SChuck Lever dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", 76946121cf7SChuck Lever ntohl(xid)); 770262ca07dSChuck Lever xprt->stat.bad_xids++; 771262ca07dSChuck Lever return NULL; 7721da177e4SLinus Torvalds } 77312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_lookup_rqst); 7741da177e4SLinus Torvalds 775bbc72ceaSChuck Lever static void xprt_update_rtt(struct rpc_task *task) 7761da177e4SLinus Torvalds { 7771570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 7781570c1e4SChuck Lever struct rpc_rtt *rtt = task->tk_client->cl_rtt; 7791da177e4SLinus Torvalds unsigned timer = task->tk_msg.rpc_proc->p_timer; 780d60dbb20STrond Myklebust long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); 7811570c1e4SChuck Lever 7821da177e4SLinus Torvalds if (timer) { 7831da177e4SLinus Torvalds if (req->rq_ntrans == 1) 784ff839970SChuck Lever rpc_update_rtt(rtt, timer, m); 7851570c1e4SChuck Lever rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891570c1e4SChuck Lever /** 7901570c1e4SChuck Lever * xprt_complete_rqst - called when reply processing is complete 7911570c1e4SChuck Lever * @task: RPC request that recently completed 7921570c1e4SChuck Lever * @copied: actual number of bytes received from the transport 7931570c1e4SChuck Lever * 7941570c1e4SChuck Lever * Caller holds transport lock. 7951570c1e4SChuck Lever */ 7961570c1e4SChuck Lever void xprt_complete_rqst(struct rpc_task *task, int copied) 7971570c1e4SChuck Lever { 7981570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 799fda13939STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 8001da177e4SLinus Torvalds 8011570c1e4SChuck Lever dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", 8021570c1e4SChuck Lever task->tk_pid, ntohl(req->rq_xid), copied); 8031da177e4SLinus Torvalds 804fda13939STrond Myklebust xprt->stat.recvs++; 805d60dbb20STrond Myklebust req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); 806bbc72ceaSChuck Lever if (xprt->ops->timer != NULL) 807bbc72ceaSChuck Lever xprt_update_rtt(task); 808ef759a2eSChuck Lever 8091da177e4SLinus Torvalds list_del_init(&req->rq_list); 8101e799b67STrond Myklebust req->rq_private_buf.len = copied; 811dd2b63d0SRicardo Labiaga /* Ensure all writes are done before we update */ 812dd2b63d0SRicardo Labiaga /* req->rq_reply_bytes_recvd */ 81343ac3f29STrond Myklebust smp_wmb(); 814dd2b63d0SRicardo Labiaga req->rq_reply_bytes_recvd = copied; 815fda13939STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, task); 8161da177e4SLinus Torvalds } 81712444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_complete_rqst); 8181da177e4SLinus Torvalds 81946c0ee8bSChuck Lever static void xprt_timer(struct rpc_task *task) 8201da177e4SLinus Torvalds { 8211da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8221da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 8231da177e4SLinus Torvalds 8245d00837bSTrond Myklebust if (task->tk_status != -ETIMEDOUT) 8255d00837bSTrond Myklebust return; 82646121cf7SChuck Lever dprintk("RPC: %5u xprt_timer\n", task->tk_pid); 82746c0ee8bSChuck Lever 8285d00837bSTrond Myklebust spin_lock_bh(&xprt->transport_lock); 829dd2b63d0SRicardo Labiaga if (!req->rq_reply_bytes_recvd) { 83046c0ee8bSChuck Lever if (xprt->ops->timer) 83146c0ee8bSChuck Lever xprt->ops->timer(task); 8325d00837bSTrond Myklebust } else 8335d00837bSTrond Myklebust task->tk_status = 0; 8345d00837bSTrond Myklebust spin_unlock_bh(&xprt->transport_lock); 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8374cfc7e60SRahul Iyer static inline int xprt_has_timer(struct rpc_xprt *xprt) 8384cfc7e60SRahul Iyer { 8394cfc7e60SRahul Iyer return xprt->idle_timeout != 0; 8404cfc7e60SRahul Iyer } 8414cfc7e60SRahul Iyer 8429903cd1cSChuck Lever /** 8439903cd1cSChuck Lever * xprt_prepare_transmit - reserve the transport before sending a request 8449903cd1cSChuck Lever * @task: RPC task about to send a request 8459903cd1cSChuck Lever * 8461da177e4SLinus Torvalds */ 8479903cd1cSChuck Lever int xprt_prepare_transmit(struct rpc_task *task) 8481da177e4SLinus Torvalds { 8491da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8501da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 8511da177e4SLinus Torvalds int err = 0; 8521da177e4SLinus Torvalds 85346121cf7SChuck Lever dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); 8541da177e4SLinus Torvalds 8554a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 856dd2b63d0SRicardo Labiaga if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) { 857dd2b63d0SRicardo Labiaga err = req->rq_reply_bytes_recvd; 8581da177e4SLinus Torvalds goto out_unlock; 8591da177e4SLinus Torvalds } 8602a491991STrond Myklebust if (!xprt->ops->reserve_xprt(task)) 8611da177e4SLinus Torvalds err = -EAGAIN; 8621da177e4SLinus Torvalds out_unlock: 8634a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 8641da177e4SLinus Torvalds return err; 8651da177e4SLinus Torvalds } 8661da177e4SLinus Torvalds 867e0ab53deSTrond Myklebust void xprt_end_transmit(struct rpc_task *task) 8685e5ce5beSTrond Myklebust { 869343952faSRahul Iyer xprt_release_write(task->tk_rqstp->rq_xprt, task); 8705e5ce5beSTrond Myklebust } 8715e5ce5beSTrond Myklebust 8729903cd1cSChuck Lever /** 8739903cd1cSChuck Lever * xprt_transmit - send an RPC request on a transport 8749903cd1cSChuck Lever * @task: controlling RPC task 8759903cd1cSChuck Lever * 8769903cd1cSChuck Lever * We have to copy the iovec because sendmsg fiddles with its contents. 8779903cd1cSChuck Lever */ 8789903cd1cSChuck Lever void xprt_transmit(struct rpc_task *task) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8811da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 882a246b010SChuck Lever int status; 8831da177e4SLinus Torvalds 88446121cf7SChuck Lever dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); 8851da177e4SLinus Torvalds 886dd2b63d0SRicardo Labiaga if (!req->rq_reply_bytes_recvd) { 88755ae1aabSRicardo Labiaga if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { 88855ae1aabSRicardo Labiaga /* 88955ae1aabSRicardo Labiaga * Add to the list only if we're expecting a reply 89055ae1aabSRicardo Labiaga */ 8914a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 8921da177e4SLinus Torvalds /* Update the softirq receive buffer */ 8931da177e4SLinus Torvalds memcpy(&req->rq_private_buf, &req->rq_rcv_buf, 8941da177e4SLinus Torvalds sizeof(req->rq_private_buf)); 8951da177e4SLinus Torvalds /* Add request to the receive list */ 8961da177e4SLinus Torvalds list_add_tail(&req->rq_list, &xprt->recv); 8974a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 8981da177e4SLinus Torvalds xprt_reset_majortimeo(req); 8990f9dc2b1STrond Myklebust /* Turn off autodisconnect */ 9000f9dc2b1STrond Myklebust del_singleshot_timer_sync(&xprt->timer); 9011da177e4SLinus Torvalds } 9021da177e4SLinus Torvalds } else if (!req->rq_bytes_sent) 9031da177e4SLinus Torvalds return; 9041da177e4SLinus Torvalds 9057c1d71cfSTrond Myklebust req->rq_connect_cookie = xprt->connect_cookie; 906ff839970SChuck Lever req->rq_xtime = ktime_get(); 907a246b010SChuck Lever status = xprt->ops->send_request(task); 908c8485e4dSTrond Myklebust if (status != 0) { 909c8485e4dSTrond Myklebust task->tk_status = status; 910c8485e4dSTrond Myklebust return; 911c8485e4dSTrond Myklebust } 912c8485e4dSTrond Myklebust 91346121cf7SChuck Lever dprintk("RPC: %5u xmit complete\n", task->tk_pid); 914fe3aca29SChuck Lever spin_lock_bh(&xprt->transport_lock); 915262ca07dSChuck Lever 916fe3aca29SChuck Lever xprt->ops->set_retrans_timeout(task); 917262ca07dSChuck Lever 918262ca07dSChuck Lever xprt->stat.sends++; 919262ca07dSChuck Lever xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; 920262ca07dSChuck Lever xprt->stat.bklog_u += xprt->backlog.qlen; 921262ca07dSChuck Lever 922fe3aca29SChuck Lever /* Don't race with disconnect */ 923fe3aca29SChuck Lever if (!xprt_connected(xprt)) 924fe3aca29SChuck Lever task->tk_status = -ENOTCONN; 925dd2b63d0SRicardo Labiaga else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) { 92655ae1aabSRicardo Labiaga /* 92755ae1aabSRicardo Labiaga * Sleep on the pending queue since 92855ae1aabSRicardo Labiaga * we're expecting a reply. 92955ae1aabSRicardo Labiaga */ 9305d00837bSTrond Myklebust rpc_sleep_on(&xprt->pending, task, xprt_timer); 93155ae1aabSRicardo Labiaga } 932fe3aca29SChuck Lever spin_unlock_bh(&xprt->transport_lock); 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 935ee5ebe85STrond Myklebust static void xprt_alloc_slot(struct rpc_task *task) 9361da177e4SLinus Torvalds { 9371da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds task->tk_status = 0; 9401da177e4SLinus Torvalds if (task->tk_rqstp) 9411da177e4SLinus Torvalds return; 9421da177e4SLinus Torvalds if (!list_empty(&xprt->free)) { 9431da177e4SLinus Torvalds struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); 9441da177e4SLinus Torvalds list_del_init(&req->rq_list); 9451da177e4SLinus Torvalds task->tk_rqstp = req; 9461da177e4SLinus Torvalds xprt_request_init(task, xprt); 9471da177e4SLinus Torvalds return; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds dprintk("RPC: waiting for request slot\n"); 9501da177e4SLinus Torvalds task->tk_status = -EAGAIN; 9511da177e4SLinus Torvalds task->tk_timeout = 0; 9525d00837bSTrond Myklebust rpc_sleep_on(&xprt->backlog, task, NULL); 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 955ee5ebe85STrond Myklebust static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) 956ee5ebe85STrond Myklebust { 957ee5ebe85STrond Myklebust memset(req, 0, sizeof(*req)); /* mark unused */ 958ee5ebe85STrond Myklebust 959ee5ebe85STrond Myklebust spin_lock(&xprt->reserve_lock); 960ee5ebe85STrond Myklebust list_add(&req->rq_list, &xprt->free); 961ee5ebe85STrond Myklebust rpc_wake_up_next(&xprt->backlog); 962ee5ebe85STrond Myklebust spin_unlock(&xprt->reserve_lock); 963ee5ebe85STrond Myklebust } 964ee5ebe85STrond Myklebust 965bd1722d4SPavel Emelyanov struct rpc_xprt *xprt_alloc(int size, int max_req) 966bd1722d4SPavel Emelyanov { 967bd1722d4SPavel Emelyanov struct rpc_xprt *xprt; 968bd1722d4SPavel Emelyanov 969bd1722d4SPavel Emelyanov xprt = kzalloc(size, GFP_KERNEL); 970bd1722d4SPavel Emelyanov if (xprt == NULL) 971bd1722d4SPavel Emelyanov goto out; 972bd1722d4SPavel Emelyanov 973bd1722d4SPavel Emelyanov xprt->max_reqs = max_req; 974bd1722d4SPavel Emelyanov xprt->slot = kcalloc(max_req, sizeof(struct rpc_rqst), GFP_KERNEL); 975bd1722d4SPavel Emelyanov if (xprt->slot == NULL) 976bd1722d4SPavel Emelyanov goto out_free; 977bd1722d4SPavel Emelyanov 978bd1722d4SPavel Emelyanov return xprt; 979bd1722d4SPavel Emelyanov 980bd1722d4SPavel Emelyanov out_free: 981bd1722d4SPavel Emelyanov kfree(xprt); 982bd1722d4SPavel Emelyanov out: 983bd1722d4SPavel Emelyanov return NULL; 984bd1722d4SPavel Emelyanov } 985bd1722d4SPavel Emelyanov EXPORT_SYMBOL_GPL(xprt_alloc); 986bd1722d4SPavel Emelyanov 9879903cd1cSChuck Lever /** 9889903cd1cSChuck Lever * xprt_reserve - allocate an RPC request slot 9899903cd1cSChuck Lever * @task: RPC task requesting a slot allocation 9909903cd1cSChuck Lever * 9919903cd1cSChuck Lever * If no more slots are available, place the task on the transport's 9929903cd1cSChuck Lever * backlog queue. 9939903cd1cSChuck Lever */ 9949903cd1cSChuck Lever void xprt_reserve(struct rpc_task *task) 9951da177e4SLinus Torvalds { 9961da177e4SLinus Torvalds struct rpc_xprt *xprt = task->tk_xprt; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds task->tk_status = -EIO; 9995dc07727SChuck Lever spin_lock(&xprt->reserve_lock); 1000ee5ebe85STrond Myklebust xprt_alloc_slot(task); 10015dc07727SChuck Lever spin_unlock(&xprt->reserve_lock); 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds 1004d8ed029dSAlexey Dobriyan static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) 10051da177e4SLinus Torvalds { 10060eae88f3SEric Dumazet return (__force __be32)xprt->xid++; 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds static inline void xprt_init_xid(struct rpc_xprt *xprt) 10101da177e4SLinus Torvalds { 1011bf3fcf89SChuck Lever xprt->xid = net_random(); 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10149903cd1cSChuck Lever static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) 10151da177e4SLinus Torvalds { 10161da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 10171da177e4SLinus Torvalds 1018ba7392bbSTrond Myklebust req->rq_timeout = task->tk_client->cl_timeout->to_initval; 10191da177e4SLinus Torvalds req->rq_task = task; 10201da177e4SLinus Torvalds req->rq_xprt = xprt; 102102107148SChuck Lever req->rq_buffer = NULL; 10221da177e4SLinus Torvalds req->rq_xid = xprt_alloc_xid(xprt); 1023ead5e1c2SJ. Bruce Fields req->rq_release_snd_buf = NULL; 1024da45828eSTrond Myklebust xprt_reset_majortimeo(req); 102546121cf7SChuck Lever dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, 10261da177e4SLinus Torvalds req, ntohl(req->rq_xid)); 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 10299903cd1cSChuck Lever /** 10309903cd1cSChuck Lever * xprt_release - release an RPC request slot 10319903cd1cSChuck Lever * @task: task which is finished with the slot 10329903cd1cSChuck Lever * 10331da177e4SLinus Torvalds */ 10349903cd1cSChuck Lever void xprt_release(struct rpc_task *task) 10351da177e4SLinus Torvalds { 103655ae1aabSRicardo Labiaga struct rpc_xprt *xprt; 10371da177e4SLinus Torvalds struct rpc_rqst *req; 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds if (!(req = task->tk_rqstp)) 10401da177e4SLinus Torvalds return; 104155ae1aabSRicardo Labiaga 104255ae1aabSRicardo Labiaga xprt = req->rq_xprt; 104311c556b3SChuck Lever rpc_count_iostats(task); 10444a0f8c04SChuck Lever spin_lock_bh(&xprt->transport_lock); 104549e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 1046a58dd398SChuck Lever if (xprt->ops->release_request) 1047a58dd398SChuck Lever xprt->ops->release_request(task); 10481da177e4SLinus Torvalds if (!list_empty(&req->rq_list)) 10491da177e4SLinus Torvalds list_del(&req->rq_list); 10501da177e4SLinus Torvalds xprt->last_used = jiffies; 10514cfc7e60SRahul Iyer if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) 1052a246b010SChuck Lever mod_timer(&xprt->timer, 105303bf4b70SChuck Lever xprt->last_used + xprt->idle_timeout); 10544a0f8c04SChuck Lever spin_unlock_bh(&xprt->transport_lock); 1055ee5ebe85STrond Myklebust if (req->rq_buffer) 1056c5a4dd8bSChuck Lever xprt->ops->buf_free(req->rq_buffer); 1057a17c2153STrond Myklebust if (req->rq_cred != NULL) 1058a17c2153STrond Myklebust put_rpccred(req->rq_cred); 10591da177e4SLinus Torvalds task->tk_rqstp = NULL; 1060ead5e1c2SJ. Bruce Fields if (req->rq_release_snd_buf) 1061ead5e1c2SJ. Bruce Fields req->rq_release_snd_buf(req); 106255ae1aabSRicardo Labiaga 106346121cf7SChuck Lever dprintk("RPC: %5u release request %p\n", task->tk_pid, req); 1064ee5ebe85STrond Myklebust if (likely(!bc_prealloc(req))) 1065ee5ebe85STrond Myklebust xprt_free_slot(xprt, req); 1066ee5ebe85STrond Myklebust else 1067c9acb42eSTrond Myklebust xprt_free_bc_request(req); 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10709903cd1cSChuck Lever /** 1071c2866763SChuck Lever * xprt_create_transport - create an RPC transport 107296802a09SFrank van Maarseveen * @args: rpc transport creation arguments 1073c2866763SChuck Lever * 1074c2866763SChuck Lever */ 10753c341b0bS\"Talpey, Thomas\ struct rpc_xprt *xprt_create_transport(struct xprt_create *args) 1076c2866763SChuck Lever { 1077c2866763SChuck Lever struct rpc_xprt *xprt; 1078c2866763SChuck Lever struct rpc_rqst *req; 1079bc25571eS\"Talpey, Thomas\ struct xprt_class *t; 1080c2866763SChuck Lever 1081bc25571eS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 1082bc25571eS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 10834fa016ebS\"Talpey, Thomas\ if (t->ident == args->ident) { 1084bc25571eS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 1085bc25571eS\"Talpey, Thomas\ goto found; 1086c2866763SChuck Lever } 1087bc25571eS\"Talpey, Thomas\ } 1088bc25571eS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 10894fa016ebS\"Talpey, Thomas\ printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); 1090bc25571eS\"Talpey, Thomas\ return ERR_PTR(-EIO); 1091bc25571eS\"Talpey, Thomas\ 1092bc25571eS\"Talpey, Thomas\ found: 1093bc25571eS\"Talpey, Thomas\ xprt = t->setup(args); 1094c8541ecdSChuck Lever if (IS_ERR(xprt)) { 1095c8541ecdSChuck Lever dprintk("RPC: xprt_create_transport: failed, %ld\n", 1096c8541ecdSChuck Lever -PTR_ERR(xprt)); 1097c8541ecdSChuck Lever return xprt; 1098c2866763SChuck Lever } 1099c2866763SChuck Lever 11006b6ca86bSTrond Myklebust kref_init(&xprt->kref); 1101c2866763SChuck Lever spin_lock_init(&xprt->transport_lock); 1102c2866763SChuck Lever spin_lock_init(&xprt->reserve_lock); 1103c2866763SChuck Lever 1104c2866763SChuck Lever INIT_LIST_HEAD(&xprt->free); 1105c2866763SChuck Lever INIT_LIST_HEAD(&xprt->recv); 1106f9acac1aSRicardo Labiaga #if defined(CONFIG_NFS_V4_1) 1107f9acac1aSRicardo Labiaga spin_lock_init(&xprt->bc_pa_lock); 1108f9acac1aSRicardo Labiaga INIT_LIST_HEAD(&xprt->bc_pa_list); 1109f9acac1aSRicardo Labiaga #endif /* CONFIG_NFS_V4_1 */ 1110f9acac1aSRicardo Labiaga 111165f27f38SDavid Howells INIT_WORK(&xprt->task_cleanup, xprt_autoclose); 11124cfc7e60SRahul Iyer if (xprt_has_timer(xprt)) 1113b24b8a24SPavel Emelyanov setup_timer(&xprt->timer, xprt_init_autodisconnect, 1114b24b8a24SPavel Emelyanov (unsigned long)xprt); 11154cfc7e60SRahul Iyer else 11164cfc7e60SRahul Iyer init_timer(&xprt->timer); 1117c2866763SChuck Lever xprt->last_used = jiffies; 1118c2866763SChuck Lever xprt->cwnd = RPC_INITCWND; 1119a509050bSChuck Lever xprt->bind_index = 0; 1120c2866763SChuck Lever 1121c2866763SChuck Lever rpc_init_wait_queue(&xprt->binding, "xprt_binding"); 1122c2866763SChuck Lever rpc_init_wait_queue(&xprt->pending, "xprt_pending"); 1123c2866763SChuck Lever rpc_init_wait_queue(&xprt->sending, "xprt_sending"); 1124c2866763SChuck Lever rpc_init_wait_queue(&xprt->resend, "xprt_resend"); 1125c2866763SChuck Lever rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); 1126c2866763SChuck Lever 1127c2866763SChuck Lever /* initialize free list */ 1128c2866763SChuck Lever for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) 1129c2866763SChuck Lever list_add(&req->rq_list, &xprt->free); 1130c2866763SChuck Lever 1131c2866763SChuck Lever xprt_init_xid(xprt); 1132c2866763SChuck Lever 1133c2866763SChuck Lever dprintk("RPC: created transport %p with %u slots\n", xprt, 1134c2866763SChuck Lever xprt->max_reqs); 1135c2866763SChuck Lever return xprt; 1136c2866763SChuck Lever } 1137c2866763SChuck Lever 11389903cd1cSChuck Lever /** 11399903cd1cSChuck Lever * xprt_destroy - destroy an RPC transport, killing off all requests. 11406b6ca86bSTrond Myklebust * @kref: kref for the transport to destroy 11419903cd1cSChuck Lever * 11421da177e4SLinus Torvalds */ 11436b6ca86bSTrond Myklebust static void xprt_destroy(struct kref *kref) 11441da177e4SLinus Torvalds { 11456b6ca86bSTrond Myklebust struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); 11466b6ca86bSTrond Myklebust 11471da177e4SLinus Torvalds dprintk("RPC: destroying transport %p\n", xprt); 11480065db32STrond Myklebust xprt->shutdown = 1; 11490065db32STrond Myklebust del_timer_sync(&xprt->timer); 1150c8541ecdSChuck Lever 1151f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->binding); 1152f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->pending); 1153f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->sending); 1154f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->resend); 1155f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&xprt->backlog); 1156c3ae62aeSJ. Bruce Fields cancel_work_sync(&xprt->task_cleanup); 1157c8541ecdSChuck Lever /* 1158c8541ecdSChuck Lever * Tear down transport state and free the rpc_xprt 1159c8541ecdSChuck Lever */ 1160a246b010SChuck Lever xprt->ops->destroy(xprt); 11616b6ca86bSTrond Myklebust } 11621da177e4SLinus Torvalds 11636b6ca86bSTrond Myklebust /** 11646b6ca86bSTrond Myklebust * xprt_put - release a reference to an RPC transport. 11656b6ca86bSTrond Myklebust * @xprt: pointer to the transport 11666b6ca86bSTrond Myklebust * 11676b6ca86bSTrond Myklebust */ 11686b6ca86bSTrond Myklebust void xprt_put(struct rpc_xprt *xprt) 11696b6ca86bSTrond Myklebust { 11706b6ca86bSTrond Myklebust kref_put(&xprt->kref, xprt_destroy); 11716b6ca86bSTrond Myklebust } 11726b6ca86bSTrond Myklebust 11736b6ca86bSTrond Myklebust /** 11746b6ca86bSTrond Myklebust * xprt_get - return a reference to an RPC transport. 11756b6ca86bSTrond Myklebust * @xprt: pointer to the transport 11766b6ca86bSTrond Myklebust * 11776b6ca86bSTrond Myklebust */ 11786b6ca86bSTrond Myklebust struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) 11796b6ca86bSTrond Myklebust { 11806b6ca86bSTrond Myklebust kref_get(&xprt->kref); 11816b6ca86bSTrond Myklebust return xprt; 11821da177e4SLinus Torvalds } 1183