1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/net/sunrpc/xprt.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * This is a generic RPC call interface supporting congestion avoidance, 61da177e4SLinus Torvalds * and asynchronous calls. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * The interface works like this: 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * - When a process places a call, it allocates a request slot if 111da177e4SLinus Torvalds * one is available. Otherwise, it sleeps on the backlog queue 121da177e4SLinus Torvalds * (xprt_reserve). 131da177e4SLinus Torvalds * - Next, the caller puts together the RPC message, stuffs it into 1455aa4f58SChuck Lever * the request struct, and calls xprt_transmit(). 1555aa4f58SChuck Lever * - xprt_transmit sends the message and installs the caller on the 1655ae1aabSRicardo Labiaga * transport's wait list. At the same time, if a reply is expected, 1755ae1aabSRicardo Labiaga * it installs a timer that is run after the packet's timeout has 1855ae1aabSRicardo Labiaga * expired. 191da177e4SLinus Torvalds * - When a packet arrives, the data_ready handler walks the list of 2055aa4f58SChuck Lever * pending requests for that transport. If a matching XID is found, the 211da177e4SLinus Torvalds * caller is woken up, and the timer removed. 221da177e4SLinus Torvalds * - When no reply arrives within the timeout interval, the timer is 231da177e4SLinus Torvalds * fired by the kernel and runs xprt_timer(). It either adjusts the 241da177e4SLinus Torvalds * timeout values (minor timeout) or wakes up the caller with a status 251da177e4SLinus Torvalds * of -ETIMEDOUT. 261da177e4SLinus Torvalds * - When the caller receives a notification from RPC that a reply arrived, 271da177e4SLinus Torvalds * it should release the RPC slot, and process the reply. 281da177e4SLinus Torvalds * If the call timed out, it may choose to retry the operation by 291da177e4SLinus Torvalds * adjusting the initial timeout value, and simply calling rpc_call 301da177e4SLinus Torvalds * again. 311da177e4SLinus Torvalds * 321da177e4SLinus Torvalds * Support for async RPC is done through a set of RPC-specific scheduling 331da177e4SLinus Torvalds * primitives that `transparently' work for processes as well as async 341da177e4SLinus Torvalds * tasks that rely on callbacks. 351da177e4SLinus Torvalds * 361da177e4SLinus Torvalds * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> 3755aa4f58SChuck Lever * 3855aa4f58SChuck Lever * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> 391da177e4SLinus Torvalds */ 401da177e4SLinus Torvalds 41a246b010SChuck Lever #include <linux/module.h> 42a246b010SChuck Lever 431da177e4SLinus Torvalds #include <linux/types.h> 44a246b010SChuck Lever #include <linux/interrupt.h> 451da177e4SLinus Torvalds #include <linux/workqueue.h> 46bf3fcf89SChuck Lever #include <linux/net.h> 47ff839970SChuck Lever #include <linux/ktime.h> 481da177e4SLinus Torvalds 49a246b010SChuck Lever #include <linux/sunrpc/clnt.h> 5011c556b3SChuck Lever #include <linux/sunrpc/metrics.h> 51c9acb42eSTrond Myklebust #include <linux/sunrpc/bc_xprt.h> 52fda1bfefSTrond Myklebust #include <linux/rcupdate.h> 53a1231fdaSTrond Myklebust #include <linux/sched/mm.h> 541da177e4SLinus Torvalds 553705ad64SJeff Layton #include <trace/events/sunrpc.h> 563705ad64SJeff Layton 5755ae1aabSRicardo Labiaga #include "sunrpc.h" 58587bc725SOlga Kornievskaia #include "sysfs.h" 59a4ae3081SChuck Lever #include "fail.h" 6055ae1aabSRicardo Labiaga 611da177e4SLinus Torvalds /* 621da177e4SLinus Torvalds * Local variables 631da177e4SLinus Torvalds */ 641da177e4SLinus Torvalds 65f895b252SJeff Layton #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 661da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_XPRT 671da177e4SLinus Torvalds #endif 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds /* 701da177e4SLinus Torvalds * Local functions 711da177e4SLinus Torvalds */ 7221de0a95STrond Myklebust static void xprt_init(struct rpc_xprt *xprt, struct net *net); 7337ac86c3SChuck Lever static __be32 xprt_alloc_xid(struct rpc_xprt *xprt); 744e0038b6STrond Myklebust static void xprt_destroy(struct rpc_xprt *xprt); 75e877a88dSNeilBrown static void xprt_request_init(struct rpc_task *task); 761da177e4SLinus Torvalds 775ba03e82SJiri Slaby static DEFINE_SPINLOCK(xprt_list_lock); 7881c098afS\"Talpey, Thomas\ static LIST_HEAD(xprt_list); 7981c098afS\"Talpey, Thomas\ 809e910bffSTrond Myklebust static unsigned long xprt_request_timeout(const struct rpc_rqst *req) 819e910bffSTrond Myklebust { 829e910bffSTrond Myklebust unsigned long timeout = jiffies + req->rq_timeout; 839e910bffSTrond Myklebust 849e910bffSTrond Myklebust if (time_before(timeout, req->rq_majortimeo)) 859e910bffSTrond Myklebust return timeout; 869e910bffSTrond Myklebust return req->rq_majortimeo; 879e910bffSTrond Myklebust } 889e910bffSTrond Myklebust 8912a80469SChuck Lever /** 9081c098afS\"Talpey, Thomas\ * xprt_register_transport - register a transport implementation 9181c098afS\"Talpey, Thomas\ * @transport: transport to register 9281c098afS\"Talpey, Thomas\ * 9381c098afS\"Talpey, Thomas\ * If a transport implementation is loaded as a kernel module, it can 9481c098afS\"Talpey, Thomas\ * call this interface to make itself known to the RPC client. 9581c098afS\"Talpey, Thomas\ * 9681c098afS\"Talpey, Thomas\ * Returns: 9781c098afS\"Talpey, Thomas\ * 0: transport successfully registered 9881c098afS\"Talpey, Thomas\ * -EEXIST: transport already registered 9981c098afS\"Talpey, Thomas\ * -EINVAL: transport module being unloaded 10081c098afS\"Talpey, Thomas\ */ 10181c098afS\"Talpey, Thomas\ int xprt_register_transport(struct xprt_class *transport) 10281c098afS\"Talpey, Thomas\ { 10381c098afS\"Talpey, Thomas\ struct xprt_class *t; 10481c098afS\"Talpey, Thomas\ int result; 10581c098afS\"Talpey, Thomas\ 10681c098afS\"Talpey, Thomas\ result = -EEXIST; 10781c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 10881c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 10981c098afS\"Talpey, Thomas\ /* don't register the same transport class twice */ 1104fa016ebS\"Talpey, Thomas\ if (t->ident == transport->ident) 11181c098afS\"Talpey, Thomas\ goto out; 11281c098afS\"Talpey, Thomas\ } 11381c098afS\"Talpey, Thomas\ 11481c098afS\"Talpey, Thomas\ list_add_tail(&transport->list, &xprt_list); 11581c098afS\"Talpey, Thomas\ printk(KERN_INFO "RPC: Registered %s transport module.\n", 11681c098afS\"Talpey, Thomas\ transport->name); 11781c098afS\"Talpey, Thomas\ result = 0; 11881c098afS\"Talpey, Thomas\ 11981c098afS\"Talpey, Thomas\ out: 12081c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 12181c098afS\"Talpey, Thomas\ return result; 12281c098afS\"Talpey, Thomas\ } 12381c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_register_transport); 12481c098afS\"Talpey, Thomas\ 12581c098afS\"Talpey, Thomas\ /** 12681c098afS\"Talpey, Thomas\ * xprt_unregister_transport - unregister a transport implementation 12765b6e42cSRandy Dunlap * @transport: transport to unregister 12881c098afS\"Talpey, Thomas\ * 12981c098afS\"Talpey, Thomas\ * Returns: 13081c098afS\"Talpey, Thomas\ * 0: transport successfully unregistered 13181c098afS\"Talpey, Thomas\ * -ENOENT: transport never registered 13281c098afS\"Talpey, Thomas\ */ 13381c098afS\"Talpey, Thomas\ int xprt_unregister_transport(struct xprt_class *transport) 13481c098afS\"Talpey, Thomas\ { 13581c098afS\"Talpey, Thomas\ struct xprt_class *t; 13681c098afS\"Talpey, Thomas\ int result; 13781c098afS\"Talpey, Thomas\ 13881c098afS\"Talpey, Thomas\ result = 0; 13981c098afS\"Talpey, Thomas\ spin_lock(&xprt_list_lock); 14081c098afS\"Talpey, Thomas\ list_for_each_entry(t, &xprt_list, list) { 14181c098afS\"Talpey, Thomas\ if (t == transport) { 14281c098afS\"Talpey, Thomas\ printk(KERN_INFO 14381c098afS\"Talpey, Thomas\ "RPC: Unregistered %s transport module.\n", 14481c098afS\"Talpey, Thomas\ transport->name); 14581c098afS\"Talpey, Thomas\ list_del_init(&transport->list); 14681c098afS\"Talpey, Thomas\ goto out; 14781c098afS\"Talpey, Thomas\ } 14881c098afS\"Talpey, Thomas\ } 14981c098afS\"Talpey, Thomas\ result = -ENOENT; 15081c098afS\"Talpey, Thomas\ 15181c098afS\"Talpey, Thomas\ out: 15281c098afS\"Talpey, Thomas\ spin_unlock(&xprt_list_lock); 15381c098afS\"Talpey, Thomas\ return result; 15481c098afS\"Talpey, Thomas\ } 15581c098afS\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_unregister_transport); 15681c098afS\"Talpey, Thomas\ 157d5aa6b22STrond Myklebust static void 158d5aa6b22STrond Myklebust xprt_class_release(const struct xprt_class *t) 159d5aa6b22STrond Myklebust { 160d5aa6b22STrond Myklebust module_put(t->owner); 161d5aa6b22STrond Myklebust } 162d5aa6b22STrond Myklebust 163d5aa6b22STrond Myklebust static const struct xprt_class * 1649bccd264STrond Myklebust xprt_class_find_by_ident_locked(int ident) 1659bccd264STrond Myklebust { 1669bccd264STrond Myklebust const struct xprt_class *t; 1679bccd264STrond Myklebust 1689bccd264STrond Myklebust list_for_each_entry(t, &xprt_list, list) { 1699bccd264STrond Myklebust if (t->ident != ident) 1709bccd264STrond Myklebust continue; 1719bccd264STrond Myklebust if (!try_module_get(t->owner)) 1729bccd264STrond Myklebust continue; 1739bccd264STrond Myklebust return t; 1749bccd264STrond Myklebust } 1759bccd264STrond Myklebust return NULL; 1769bccd264STrond Myklebust } 1779bccd264STrond Myklebust 1789bccd264STrond Myklebust static const struct xprt_class * 1799bccd264STrond Myklebust xprt_class_find_by_ident(int ident) 1809bccd264STrond Myklebust { 1819bccd264STrond Myklebust const struct xprt_class *t; 1829bccd264STrond Myklebust 1839bccd264STrond Myklebust spin_lock(&xprt_list_lock); 1849bccd264STrond Myklebust t = xprt_class_find_by_ident_locked(ident); 1859bccd264STrond Myklebust spin_unlock(&xprt_list_lock); 1869bccd264STrond Myklebust return t; 1879bccd264STrond Myklebust } 1889bccd264STrond Myklebust 1899bccd264STrond Myklebust static const struct xprt_class * 190d5aa6b22STrond Myklebust xprt_class_find_by_netid_locked(const char *netid) 191d5aa6b22STrond Myklebust { 192d5aa6b22STrond Myklebust const struct xprt_class *t; 193d5aa6b22STrond Myklebust unsigned int i; 194d5aa6b22STrond Myklebust 195d5aa6b22STrond Myklebust list_for_each_entry(t, &xprt_list, list) { 196d5aa6b22STrond Myklebust for (i = 0; t->netid[i][0] != '\0'; i++) { 197d5aa6b22STrond Myklebust if (strcmp(t->netid[i], netid) != 0) 198d5aa6b22STrond Myklebust continue; 199d5aa6b22STrond Myklebust if (!try_module_get(t->owner)) 200d5aa6b22STrond Myklebust continue; 201d5aa6b22STrond Myklebust return t; 202d5aa6b22STrond Myklebust } 203d5aa6b22STrond Myklebust } 204d5aa6b22STrond Myklebust return NULL; 205d5aa6b22STrond Myklebust } 206d5aa6b22STrond Myklebust 207d5aa6b22STrond Myklebust static const struct xprt_class * 208d5aa6b22STrond Myklebust xprt_class_find_by_netid(const char *netid) 209d5aa6b22STrond Myklebust { 210d5aa6b22STrond Myklebust const struct xprt_class *t; 211d5aa6b22STrond Myklebust 212d5aa6b22STrond Myklebust spin_lock(&xprt_list_lock); 213d5aa6b22STrond Myklebust t = xprt_class_find_by_netid_locked(netid); 214d5aa6b22STrond Myklebust if (!t) { 215d5aa6b22STrond Myklebust spin_unlock(&xprt_list_lock); 216d5aa6b22STrond Myklebust request_module("rpc%s", netid); 217d5aa6b22STrond Myklebust spin_lock(&xprt_list_lock); 218d5aa6b22STrond Myklebust t = xprt_class_find_by_netid_locked(netid); 219d5aa6b22STrond Myklebust } 220d5aa6b22STrond Myklebust spin_unlock(&xprt_list_lock); 221d5aa6b22STrond Myklebust return t; 222d5aa6b22STrond Myklebust } 223d5aa6b22STrond Myklebust 22481c098afS\"Talpey, Thomas\ /** 2251fc5f131STrond Myklebust * xprt_find_transport_ident - convert a netid into a transport identifier 2261fc5f131STrond Myklebust * @netid: transport to load 2271fc5f131STrond Myklebust * 2281fc5f131STrond Myklebust * Returns: 2291fc5f131STrond Myklebust * > 0: transport identifier 2301fc5f131STrond Myklebust * -ENOENT: transport module not available 2311fc5f131STrond Myklebust */ 2321fc5f131STrond Myklebust int xprt_find_transport_ident(const char *netid) 2331fc5f131STrond Myklebust { 2341fc5f131STrond Myklebust const struct xprt_class *t; 2351fc5f131STrond Myklebust int ret; 2361fc5f131STrond Myklebust 2371fc5f131STrond Myklebust t = xprt_class_find_by_netid(netid); 2381fc5f131STrond Myklebust if (!t) 2391fc5f131STrond Myklebust return -ENOENT; 2401fc5f131STrond Myklebust ret = t->ident; 2411fc5f131STrond Myklebust xprt_class_release(t); 2421fc5f131STrond Myklebust return ret; 2431fc5f131STrond Myklebust } 2441fc5f131STrond Myklebust EXPORT_SYMBOL_GPL(xprt_find_transport_ident); 2451fc5f131STrond Myklebust 246c544577dSTrond Myklebust static void xprt_clear_locked(struct rpc_xprt *xprt) 247c544577dSTrond Myklebust { 248c544577dSTrond Myklebust xprt->snd_task = NULL; 24933c3214bSTrond Myklebust if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) 25033c3214bSTrond Myklebust clear_bit_unlock(XPRT_LOCKED, &xprt->state); 25133c3214bSTrond Myklebust else 252c544577dSTrond Myklebust queue_work(xprtiod_workqueue, &xprt->task_cleanup); 253c544577dSTrond Myklebust } 254c544577dSTrond Myklebust 255441e3e24STom Talpey /** 25612a80469SChuck Lever * xprt_reserve_xprt - serialize write access to transports 25712a80469SChuck Lever * @task: task that is requesting access to the transport 258177c27bfSRandy Dunlap * @xprt: pointer to the target transport 25912a80469SChuck Lever * 26012a80469SChuck Lever * This prevents mixing the payload of separate requests, and prevents 26112a80469SChuck Lever * transport connects from colliding with writes. No congestion control 26212a80469SChuck Lever * is provided. 2631da177e4SLinus Torvalds */ 26443cedbf0STrond Myklebust int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 2651da177e4SLinus Torvalds { 26612a80469SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 26712a80469SChuck Lever 26812a80469SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 26912a80469SChuck Lever if (task == xprt->snd_task) 270bf7ca707SChuck Lever goto out_locked; 27112a80469SChuck Lever goto out_sleep; 27212a80469SChuck Lever } 273c544577dSTrond Myklebust if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) 274c544577dSTrond Myklebust goto out_unlock; 27512a80469SChuck Lever xprt->snd_task = task; 2764d4a76f3Sj223yang@asset.uwaterloo.ca 277bf7ca707SChuck Lever out_locked: 278bf7ca707SChuck Lever trace_xprt_reserve_xprt(xprt, task); 27912a80469SChuck Lever return 1; 28012a80469SChuck Lever 281c544577dSTrond Myklebust out_unlock: 282c544577dSTrond Myklebust xprt_clear_locked(xprt); 28312a80469SChuck Lever out_sleep: 28412a80469SChuck Lever task->tk_status = -EAGAIN; 2856b2e6856STrond Myklebust if (RPC_IS_SOFT(task)) 2866b2e6856STrond Myklebust rpc_sleep_on_timeout(&xprt->sending, task, NULL, 2879e910bffSTrond Myklebust xprt_request_timeout(req)); 2886b2e6856STrond Myklebust else 28979c99152STrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 29012a80469SChuck Lever return 0; 29112a80469SChuck Lever } 29212444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt); 29312a80469SChuck Lever 29475891f50STrond Myklebust static bool 29575891f50STrond Myklebust xprt_need_congestion_window_wait(struct rpc_xprt *xprt) 29675891f50STrond Myklebust { 29775891f50STrond Myklebust return test_bit(XPRT_CWND_WAIT, &xprt->state); 29875891f50STrond Myklebust } 29975891f50STrond Myklebust 30075891f50STrond Myklebust static void 30175891f50STrond Myklebust xprt_set_congestion_window_wait(struct rpc_xprt *xprt) 30275891f50STrond Myklebust { 30375891f50STrond Myklebust if (!list_empty(&xprt->xmit_queue)) { 30475891f50STrond Myklebust /* Peek at head of queue to see if it can make progress */ 30575891f50STrond Myklebust if (list_first_entry(&xprt->xmit_queue, struct rpc_rqst, 30675891f50STrond Myklebust rq_xmit)->rq_cong) 30775891f50STrond Myklebust return; 30875891f50STrond Myklebust } 30975891f50STrond Myklebust set_bit(XPRT_CWND_WAIT, &xprt->state); 31075891f50STrond Myklebust } 31175891f50STrond Myklebust 31275891f50STrond Myklebust static void 31375891f50STrond Myklebust xprt_test_and_clear_congestion_window_wait(struct rpc_xprt *xprt) 31475891f50STrond Myklebust { 31575891f50STrond Myklebust if (!RPCXPRT_CONGESTED(xprt)) 31675891f50STrond Myklebust clear_bit(XPRT_CWND_WAIT, &xprt->state); 31775891f50STrond Myklebust } 31875891f50STrond Myklebust 31912a80469SChuck Lever /* 32012a80469SChuck Lever * xprt_reserve_xprt_cong - serialize write access to transports 32112a80469SChuck Lever * @task: task that is requesting access to the transport 32212a80469SChuck Lever * 32312a80469SChuck Lever * Same as xprt_reserve_xprt, but Van Jacobson congestion control is 32412a80469SChuck Lever * integrated into the decision of whether a request is allowed to be 32512a80469SChuck Lever * woken up and given access to the transport. 32675891f50STrond Myklebust * Note that the lock is only granted if we know there are free slots. 32712a80469SChuck Lever */ 32843cedbf0STrond Myklebust int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) 32912a80469SChuck Lever { 3301da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 3311da177e4SLinus Torvalds 3322226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { 3331da177e4SLinus Torvalds if (task == xprt->snd_task) 334bf7ca707SChuck Lever goto out_locked; 3351da177e4SLinus Torvalds goto out_sleep; 3361da177e4SLinus Torvalds } 33743cedbf0STrond Myklebust if (req == NULL) { 33843cedbf0STrond Myklebust xprt->snd_task = task; 339bf7ca707SChuck Lever goto out_locked; 34043cedbf0STrond Myklebust } 341c544577dSTrond Myklebust if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) 342c544577dSTrond Myklebust goto out_unlock; 34375891f50STrond Myklebust if (!xprt_need_congestion_window_wait(xprt)) { 3441da177e4SLinus Torvalds xprt->snd_task = task; 345bf7ca707SChuck Lever goto out_locked; 3461da177e4SLinus Torvalds } 347c544577dSTrond Myklebust out_unlock: 348632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 3491da177e4SLinus Torvalds out_sleep: 3501da177e4SLinus Torvalds task->tk_status = -EAGAIN; 3516b2e6856STrond Myklebust if (RPC_IS_SOFT(task)) 3526b2e6856STrond Myklebust rpc_sleep_on_timeout(&xprt->sending, task, NULL, 3539e910bffSTrond Myklebust xprt_request_timeout(req)); 3546b2e6856STrond Myklebust else 35579c99152STrond Myklebust rpc_sleep_on(&xprt->sending, task, NULL); 3561da177e4SLinus Torvalds return 0; 357bf7ca707SChuck Lever out_locked: 358bf7ca707SChuck Lever trace_xprt_reserve_cong(xprt, task); 359bf7ca707SChuck Lever return 1; 3601da177e4SLinus Torvalds } 36112444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); 3621da177e4SLinus Torvalds 36312a80469SChuck Lever static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds int retval; 3661da177e4SLinus Torvalds 367bd79bc57STrond Myklebust if (test_bit(XPRT_LOCKED, &xprt->state) && xprt->snd_task == task) 368bd79bc57STrond Myklebust return 1; 369b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 37043cedbf0STrond Myklebust retval = xprt->ops->reserve_xprt(xprt, task); 371b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 3721da177e4SLinus Torvalds return retval; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 375961a828dSTrond Myklebust static bool __xprt_lock_write_func(struct rpc_task *task, void *data) 3761da177e4SLinus Torvalds { 377961a828dSTrond Myklebust struct rpc_xprt *xprt = data; 37849e9a890SChuck Lever 37949e9a890SChuck Lever xprt->snd_task = task; 380961a828dSTrond Myklebust return true; 381961a828dSTrond Myklebust } 382961a828dSTrond Myklebust 383961a828dSTrond Myklebust static void __xprt_lock_write_next(struct rpc_xprt *xprt) 384961a828dSTrond Myklebust { 385961a828dSTrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 38649e9a890SChuck Lever return; 387c544577dSTrond Myklebust if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) 388c544577dSTrond Myklebust goto out_unlock; 389f1dc237cSTrond Myklebust if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, 390f1dc237cSTrond Myklebust __xprt_lock_write_func, xprt)) 391961a828dSTrond Myklebust return; 392c544577dSTrond Myklebust out_unlock: 393632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 39449e9a890SChuck Lever } 39549e9a890SChuck Lever 396961a828dSTrond Myklebust static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) 397961a828dSTrond Myklebust { 398961a828dSTrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 399961a828dSTrond Myklebust return; 400c544577dSTrond Myklebust if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) 401c544577dSTrond Myklebust goto out_unlock; 40275891f50STrond Myklebust if (xprt_need_congestion_window_wait(xprt)) 403961a828dSTrond Myklebust goto out_unlock; 404f1dc237cSTrond Myklebust if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, 40575891f50STrond Myklebust __xprt_lock_write_func, xprt)) 406961a828dSTrond Myklebust return; 4071da177e4SLinus Torvalds out_unlock: 408632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 41149e9a890SChuck Lever /** 41249e9a890SChuck Lever * xprt_release_xprt - allow other requests to use a transport 41349e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 41449e9a890SChuck Lever * @task: task that is releasing access to the transport 41549e9a890SChuck Lever * 41649e9a890SChuck Lever * Note that "task" can be NULL. No congestion control is provided. 4171da177e4SLinus Torvalds */ 41849e9a890SChuck Lever void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds if (xprt->snd_task == task) { 421632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 4221da177e4SLinus Torvalds __xprt_lock_write_next(xprt); 4231da177e4SLinus Torvalds } 424bf7ca707SChuck Lever trace_xprt_release_xprt(xprt, task); 4251da177e4SLinus Torvalds } 42612444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt); 4271da177e4SLinus Torvalds 42849e9a890SChuck Lever /** 42949e9a890SChuck Lever * xprt_release_xprt_cong - allow other requests to use a transport 43049e9a890SChuck Lever * @xprt: transport with other tasks potentially waiting 43149e9a890SChuck Lever * @task: task that is releasing access to the transport 43249e9a890SChuck Lever * 43349e9a890SChuck Lever * Note that "task" can be NULL. Another task is awoken to use the 43449e9a890SChuck Lever * transport if the transport's congestion window allows it. 43549e9a890SChuck Lever */ 43649e9a890SChuck Lever void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) 43749e9a890SChuck Lever { 43849e9a890SChuck Lever if (xprt->snd_task == task) { 439632e3bdcSTrond Myklebust xprt_clear_locked(xprt); 44049e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 44149e9a890SChuck Lever } 442bf7ca707SChuck Lever trace_xprt_release_cong(xprt, task); 44349e9a890SChuck Lever } 44412444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); 44549e9a890SChuck Lever 446587bc725SOlga Kornievskaia void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) 4471da177e4SLinus Torvalds { 448bd79bc57STrond Myklebust if (xprt->snd_task != task) 449bd79bc57STrond Myklebust return; 450b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 45149e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 452b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* 4561da177e4SLinus Torvalds * Van Jacobson congestion avoidance. Check if the congestion window 4571da177e4SLinus Torvalds * overflowed. Put the task to sleep if this is the case. 4581da177e4SLinus Torvalds */ 4591da177e4SLinus Torvalds static int 46075891f50STrond Myklebust __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) 4611da177e4SLinus Torvalds { 4621da177e4SLinus Torvalds if (req->rq_cong) 4631da177e4SLinus Torvalds return 1; 464bf7ca707SChuck Lever trace_xprt_get_cong(xprt, req->rq_task); 46575891f50STrond Myklebust if (RPCXPRT_CONGESTED(xprt)) { 46675891f50STrond Myklebust xprt_set_congestion_window_wait(xprt); 4671da177e4SLinus Torvalds return 0; 46875891f50STrond Myklebust } 4691da177e4SLinus Torvalds req->rq_cong = 1; 4701da177e4SLinus Torvalds xprt->cong += RPC_CWNDSCALE; 4711da177e4SLinus Torvalds return 1; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds /* 4751da177e4SLinus Torvalds * Adjust the congestion window, and wake up the next task 4761da177e4SLinus Torvalds * that has been sleeping due to congestion 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds static void 4791da177e4SLinus Torvalds __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds if (!req->rq_cong) 4821da177e4SLinus Torvalds return; 4831da177e4SLinus Torvalds req->rq_cong = 0; 4841da177e4SLinus Torvalds xprt->cong -= RPC_CWNDSCALE; 48575891f50STrond Myklebust xprt_test_and_clear_congestion_window_wait(xprt); 486bf7ca707SChuck Lever trace_xprt_put_cong(xprt, req->rq_task); 48749e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 49046c0ee8bSChuck Lever /** 49175891f50STrond Myklebust * xprt_request_get_cong - Request congestion control credits 49275891f50STrond Myklebust * @xprt: pointer to transport 49375891f50STrond Myklebust * @req: pointer to RPC request 49475891f50STrond Myklebust * 49575891f50STrond Myklebust * Useful for transports that require congestion control. 49675891f50STrond Myklebust */ 49775891f50STrond Myklebust bool 49875891f50STrond Myklebust xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) 49975891f50STrond Myklebust { 50075891f50STrond Myklebust bool ret = false; 50175891f50STrond Myklebust 50275891f50STrond Myklebust if (req->rq_cong) 50375891f50STrond Myklebust return true; 504b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 50575891f50STrond Myklebust ret = __xprt_get_cong(xprt, req) != 0; 506b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 50775891f50STrond Myklebust return ret; 50875891f50STrond Myklebust } 50975891f50STrond Myklebust EXPORT_SYMBOL_GPL(xprt_request_get_cong); 51075891f50STrond Myklebust 51175891f50STrond Myklebust /** 512a58dd398SChuck Lever * xprt_release_rqst_cong - housekeeping when request is complete 513a58dd398SChuck Lever * @task: RPC request that recently completed 514a58dd398SChuck Lever * 515a58dd398SChuck Lever * Useful for transports that require congestion control. 516a58dd398SChuck Lever */ 517a58dd398SChuck Lever void xprt_release_rqst_cong(struct rpc_task *task) 518a58dd398SChuck Lever { 519a4f0835cSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 520a4f0835cSTrond Myklebust 521a4f0835cSTrond Myklebust __xprt_put_cong(req->rq_xprt, req); 522a58dd398SChuck Lever } 52312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); 524a58dd398SChuck Lever 5258593e010SChuck Lever static void xprt_clear_congestion_window_wait_locked(struct rpc_xprt *xprt) 5268593e010SChuck Lever { 5278593e010SChuck Lever if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) 5288593e010SChuck Lever __xprt_lock_write_next_cong(xprt); 5298593e010SChuck Lever } 5308593e010SChuck Lever 53175891f50STrond Myklebust /* 53275891f50STrond Myklebust * Clear the congestion window wait flag and wake up the next 53375891f50STrond Myklebust * entry on xprt->sending 53475891f50STrond Myklebust */ 53575891f50STrond Myklebust static void 53675891f50STrond Myklebust xprt_clear_congestion_window_wait(struct rpc_xprt *xprt) 53775891f50STrond Myklebust { 53875891f50STrond Myklebust if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) { 539b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 54075891f50STrond Myklebust __xprt_lock_write_next_cong(xprt); 541b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 54275891f50STrond Myklebust } 54375891f50STrond Myklebust } 54475891f50STrond Myklebust 545a58dd398SChuck Lever /** 54646c0ee8bSChuck Lever * xprt_adjust_cwnd - adjust transport congestion window 5476a24dfb6STrond Myklebust * @xprt: pointer to xprt 54846c0ee8bSChuck Lever * @task: recently completed RPC request used to adjust window 54946c0ee8bSChuck Lever * @result: result code of completed RPC request 55046c0ee8bSChuck Lever * 5514f4cf5adSChuck Lever * The transport code maintains an estimate on the maximum number of out- 5524f4cf5adSChuck Lever * standing RPC requests, using a smoothed version of the congestion 5534f4cf5adSChuck Lever * avoidance implemented in 44BSD. This is basically the Van Jacobson 5544f4cf5adSChuck Lever * congestion algorithm: If a retransmit occurs, the congestion window is 5554f4cf5adSChuck Lever * halved; otherwise, it is incremented by 1/cwnd when 5564f4cf5adSChuck Lever * 5574f4cf5adSChuck Lever * - a reply is received and 5584f4cf5adSChuck Lever * - a full number of requests are outstanding and 5594f4cf5adSChuck Lever * - the congestion window hasn't been updated recently. 5601da177e4SLinus Torvalds */ 5616a24dfb6STrond Myklebust void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result) 5621da177e4SLinus Torvalds { 56346c0ee8bSChuck Lever struct rpc_rqst *req = task->tk_rqstp; 56446c0ee8bSChuck Lever unsigned long cwnd = xprt->cwnd; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds if (result >= 0 && cwnd <= xprt->cong) { 5671da177e4SLinus Torvalds /* The (cwnd >> 1) term makes sure 5681da177e4SLinus Torvalds * the result gets rounded properly. */ 5691da177e4SLinus Torvalds cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; 5701da177e4SLinus Torvalds if (cwnd > RPC_MAXCWND(xprt)) 5711da177e4SLinus Torvalds cwnd = RPC_MAXCWND(xprt); 57249e9a890SChuck Lever __xprt_lock_write_next_cong(xprt); 5731da177e4SLinus Torvalds } else if (result == -ETIMEDOUT) { 5741da177e4SLinus Torvalds cwnd >>= 1; 5751da177e4SLinus Torvalds if (cwnd < RPC_CWNDSCALE) 5761da177e4SLinus Torvalds cwnd = RPC_CWNDSCALE; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", 5791da177e4SLinus Torvalds xprt->cong, xprt->cwnd, cwnd); 5801da177e4SLinus Torvalds xprt->cwnd = cwnd; 58146c0ee8bSChuck Lever __xprt_put_cong(xprt, req); 5821da177e4SLinus Torvalds } 58312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); 5841da177e4SLinus Torvalds 58544fbac22SChuck Lever /** 58644fbac22SChuck Lever * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue 58744fbac22SChuck Lever * @xprt: transport with waiting tasks 58844fbac22SChuck Lever * @status: result code to plant in each task before waking it 58944fbac22SChuck Lever * 59044fbac22SChuck Lever */ 59144fbac22SChuck Lever void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) 59244fbac22SChuck Lever { 59344fbac22SChuck Lever if (status < 0) 59444fbac22SChuck Lever rpc_wake_up_status(&xprt->pending, status); 59544fbac22SChuck Lever else 59644fbac22SChuck Lever rpc_wake_up(&xprt->pending); 59744fbac22SChuck Lever } 59812444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); 59944fbac22SChuck Lever 600c7b2cae8SChuck Lever /** 601c7b2cae8SChuck Lever * xprt_wait_for_buffer_space - wait for transport output buffer to clear 602c544577dSTrond Myklebust * @xprt: transport 603a9a6b52eSTrond Myklebust * 604a9a6b52eSTrond Myklebust * Note that we only set the timer for the case of RPC_IS_SOFT(), since 605a9a6b52eSTrond Myklebust * we don't in general want to force a socket disconnection due to 606a9a6b52eSTrond Myklebust * an incomplete RPC call transmission. 607c7b2cae8SChuck Lever */ 608c544577dSTrond Myklebust void xprt_wait_for_buffer_space(struct rpc_xprt *xprt) 609c7b2cae8SChuck Lever { 610c544577dSTrond Myklebust set_bit(XPRT_WRITE_SPACE, &xprt->state); 611c7b2cae8SChuck Lever } 61212444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); 613c7b2cae8SChuck Lever 614c544577dSTrond Myklebust static bool 615c544577dSTrond Myklebust xprt_clear_write_space_locked(struct rpc_xprt *xprt) 616c544577dSTrond Myklebust { 617c544577dSTrond Myklebust if (test_and_clear_bit(XPRT_WRITE_SPACE, &xprt->state)) { 618c544577dSTrond Myklebust __xprt_lock_write_next(xprt); 619c544577dSTrond Myklebust dprintk("RPC: write space: waking waiting task on " 620c544577dSTrond Myklebust "xprt %p\n", xprt); 621c544577dSTrond Myklebust return true; 622c544577dSTrond Myklebust } 623c544577dSTrond Myklebust return false; 624c544577dSTrond Myklebust } 625c544577dSTrond Myklebust 626c7b2cae8SChuck Lever /** 627c7b2cae8SChuck Lever * xprt_write_space - wake the task waiting for transport output buffer space 628c7b2cae8SChuck Lever * @xprt: transport with waiting tasks 629c7b2cae8SChuck Lever * 630c7b2cae8SChuck Lever * Can be called in a soft IRQ context, so xprt_write_space never sleeps. 631c7b2cae8SChuck Lever */ 632c544577dSTrond Myklebust bool xprt_write_space(struct rpc_xprt *xprt) 633c7b2cae8SChuck Lever { 634c544577dSTrond Myklebust bool ret; 635c544577dSTrond Myklebust 636c544577dSTrond Myklebust if (!test_bit(XPRT_WRITE_SPACE, &xprt->state)) 637c544577dSTrond Myklebust return false; 638b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 639c544577dSTrond Myklebust ret = xprt_clear_write_space_locked(xprt); 640b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 641c544577dSTrond Myklebust return ret; 642c7b2cae8SChuck Lever } 64312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_write_space); 644c7b2cae8SChuck Lever 645da953063STrond Myklebust static unsigned long xprt_abs_ktime_to_jiffies(ktime_t abstime) 646da953063STrond Myklebust { 647da953063STrond Myklebust s64 delta = ktime_to_ns(ktime_get() - abstime); 648da953063STrond Myklebust return likely(delta >= 0) ? 649da953063STrond Myklebust jiffies - nsecs_to_jiffies(delta) : 650da953063STrond Myklebust jiffies + nsecs_to_jiffies(-delta); 651da953063STrond Myklebust } 652da953063STrond Myklebust 653da953063STrond Myklebust static unsigned long xprt_calc_majortimeo(struct rpc_rqst *req) 6541da177e4SLinus Torvalds { 655ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 656da953063STrond Myklebust unsigned long majortimeo = req->rq_timeout; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds if (to->to_exponential) 659da953063STrond Myklebust majortimeo <<= to->to_retries; 6601da177e4SLinus Torvalds else 661da953063STrond Myklebust majortimeo += to->to_increment * to->to_retries; 662da953063STrond Myklebust if (majortimeo > to->to_maxval || majortimeo == 0) 663da953063STrond Myklebust majortimeo = to->to_maxval; 664da953063STrond Myklebust return majortimeo; 665da953063STrond Myklebust } 666da953063STrond Myklebust 667da953063STrond Myklebust static void xprt_reset_majortimeo(struct rpc_rqst *req) 668da953063STrond Myklebust { 669da953063STrond Myklebust req->rq_majortimeo += xprt_calc_majortimeo(req); 670da953063STrond Myklebust } 671da953063STrond Myklebust 6727de62bc0SOlga Kornievskaia static void xprt_reset_minortimeo(struct rpc_rqst *req) 6737de62bc0SOlga Kornievskaia { 6747de62bc0SOlga Kornievskaia req->rq_minortimeo += req->rq_timeout; 6757de62bc0SOlga Kornievskaia } 6767de62bc0SOlga Kornievskaia 677da953063STrond Myklebust static void xprt_init_majortimeo(struct rpc_task *task, struct rpc_rqst *req) 678da953063STrond Myklebust { 679da953063STrond Myklebust unsigned long time_init; 680da953063STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 681da953063STrond Myklebust 682da953063STrond Myklebust if (likely(xprt && xprt_connected(xprt))) 683da953063STrond Myklebust time_init = jiffies; 684da953063STrond Myklebust else 685da953063STrond Myklebust time_init = xprt_abs_ktime_to_jiffies(task->tk_start); 686da953063STrond Myklebust req->rq_timeout = task->tk_client->cl_timeout->to_initval; 687da953063STrond Myklebust req->rq_majortimeo = time_init + xprt_calc_majortimeo(req); 6887de62bc0SOlga Kornievskaia req->rq_minortimeo = time_init + req->rq_timeout; 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6919903cd1cSChuck Lever /** 6929903cd1cSChuck Lever * xprt_adjust_timeout - adjust timeout values for next retransmit 6939903cd1cSChuck Lever * @req: RPC request containing parameters to use for the adjustment 6949903cd1cSChuck Lever * 6951da177e4SLinus Torvalds */ 6961da177e4SLinus Torvalds int xprt_adjust_timeout(struct rpc_rqst *req) 6971da177e4SLinus Torvalds { 6981da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 699ba7392bbSTrond Myklebust const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; 7001da177e4SLinus Torvalds int status = 0; 7011da177e4SLinus Torvalds 70209252177SChris Dion if (time_before(jiffies, req->rq_majortimeo)) { 7037de62bc0SOlga Kornievskaia if (time_before(jiffies, req->rq_minortimeo)) 7047de62bc0SOlga Kornievskaia return status; 7051da177e4SLinus Torvalds if (to->to_exponential) 7061da177e4SLinus Torvalds req->rq_timeout <<= 1; 7071da177e4SLinus Torvalds else 7081da177e4SLinus Torvalds req->rq_timeout += to->to_increment; 7091da177e4SLinus Torvalds if (to->to_maxval && req->rq_timeout >= to->to_maxval) 7101da177e4SLinus Torvalds req->rq_timeout = to->to_maxval; 7111da177e4SLinus Torvalds req->rq_retries++; 7121da177e4SLinus Torvalds } else { 7131da177e4SLinus Torvalds req->rq_timeout = to->to_initval; 7141da177e4SLinus Torvalds req->rq_retries = 0; 7151da177e4SLinus Torvalds xprt_reset_majortimeo(req); 7161da177e4SLinus Torvalds /* Reset the RTT counters == "slow start" */ 717b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 7181da177e4SLinus Torvalds rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); 719b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 7201da177e4SLinus Torvalds status = -ETIMEDOUT; 7211da177e4SLinus Torvalds } 7227de62bc0SOlga Kornievskaia xprt_reset_minortimeo(req); 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds if (req->rq_timeout == 0) { 7251da177e4SLinus Torvalds printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); 7261da177e4SLinus Torvalds req->rq_timeout = 5 * HZ; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds return status; 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds 73165f27f38SDavid Howells static void xprt_autoclose(struct work_struct *work) 7321da177e4SLinus Torvalds { 73365f27f38SDavid Howells struct rpc_xprt *xprt = 73465f27f38SDavid Howells container_of(work, struct rpc_xprt, task_cleanup); 735a1231fdaSTrond Myklebust unsigned int pflags = memalloc_nofs_save(); 7361da177e4SLinus Torvalds 737911813d7SChuck Lever trace_xprt_disconnect_auto(xprt); 738*d896ba83STrond Myklebust xprt->connect_cookie++; 739*d896ba83STrond Myklebust smp_mb__before_atomic(); 74066af1e55STrond Myklebust clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 7414876cc77STrond Myklebust xprt->ops->close(xprt); 7421da177e4SLinus Torvalds xprt_release_write(xprt, NULL); 74379234c3dSTrond Myklebust wake_up_bit(&xprt->state, XPRT_LOCKED); 744a1231fdaSTrond Myklebust memalloc_nofs_restore(pflags); 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 7479903cd1cSChuck Lever /** 74862da3b24STrond Myklebust * xprt_disconnect_done - mark a transport as disconnected 7499903cd1cSChuck Lever * @xprt: transport to flag for disconnect 7509903cd1cSChuck Lever * 7511da177e4SLinus Torvalds */ 75262da3b24STrond Myklebust void xprt_disconnect_done(struct rpc_xprt *xprt) 7531da177e4SLinus Torvalds { 754911813d7SChuck Lever trace_xprt_disconnect_done(xprt); 755b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 7561da177e4SLinus Torvalds xprt_clear_connected(xprt); 757c544577dSTrond Myklebust xprt_clear_write_space_locked(xprt); 7588593e010SChuck Lever xprt_clear_congestion_window_wait_locked(xprt); 75927adc785STrond Myklebust xprt_wake_pending_tasks(xprt, -ENOTCONN); 760b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 7611da177e4SLinus Torvalds } 76262da3b24STrond Myklebust EXPORT_SYMBOL_GPL(xprt_disconnect_done); 7631da177e4SLinus Torvalds 76466af1e55STrond Myklebust /** 765e26d9972STrond Myklebust * xprt_schedule_autoclose_locked - Try to schedule an autoclose RPC call 766e26d9972STrond Myklebust * @xprt: transport to disconnect 767e26d9972STrond Myklebust */ 768e26d9972STrond Myklebust static void xprt_schedule_autoclose_locked(struct rpc_xprt *xprt) 769e26d9972STrond Myklebust { 770e26d9972STrond Myklebust set_bit(XPRT_CLOSE_WAIT, &xprt->state); 771e26d9972STrond Myklebust if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 772e26d9972STrond Myklebust queue_work(xprtiod_workqueue, &xprt->task_cleanup); 773e26d9972STrond Myklebust else if (xprt->snd_task && !test_bit(XPRT_SND_IS_COOKIE, &xprt->state)) 774e26d9972STrond Myklebust rpc_wake_up_queued_task_set_status(&xprt->pending, 775e26d9972STrond Myklebust xprt->snd_task, -ENOTCONN); 776e26d9972STrond Myklebust } 777e26d9972STrond Myklebust 778e26d9972STrond Myklebust /** 77966af1e55STrond Myklebust * xprt_force_disconnect - force a transport to disconnect 78066af1e55STrond Myklebust * @xprt: transport to disconnect 78166af1e55STrond Myklebust * 78266af1e55STrond Myklebust */ 78366af1e55STrond Myklebust void xprt_force_disconnect(struct rpc_xprt *xprt) 78466af1e55STrond Myklebust { 785911813d7SChuck Lever trace_xprt_disconnect_force(xprt); 786911813d7SChuck Lever 78766af1e55STrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 788b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 789e26d9972STrond Myklebust xprt_schedule_autoclose_locked(xprt); 790b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 79166af1e55STrond Myklebust } 792e2a4f4fbSChuck Lever EXPORT_SYMBOL_GPL(xprt_force_disconnect); 79366af1e55STrond Myklebust 7947f3a1d1eSTrond Myklebust static unsigned int 7957f3a1d1eSTrond Myklebust xprt_connect_cookie(struct rpc_xprt *xprt) 7967f3a1d1eSTrond Myklebust { 7977f3a1d1eSTrond Myklebust return READ_ONCE(xprt->connect_cookie); 7987f3a1d1eSTrond Myklebust } 7997f3a1d1eSTrond Myklebust 8007f3a1d1eSTrond Myklebust static bool 8017f3a1d1eSTrond Myklebust xprt_request_retransmit_after_disconnect(struct rpc_task *task) 8027f3a1d1eSTrond Myklebust { 8037f3a1d1eSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 8047f3a1d1eSTrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 8057f3a1d1eSTrond Myklebust 8067f3a1d1eSTrond Myklebust return req->rq_connect_cookie != xprt_connect_cookie(xprt) || 8077f3a1d1eSTrond Myklebust !xprt_connected(xprt); 8087f3a1d1eSTrond Myklebust } 8097f3a1d1eSTrond Myklebust 8107c1d71cfSTrond Myklebust /** 8117c1d71cfSTrond Myklebust * xprt_conditional_disconnect - force a transport to disconnect 8127c1d71cfSTrond Myklebust * @xprt: transport to disconnect 8137c1d71cfSTrond Myklebust * @cookie: 'connection cookie' 8147c1d71cfSTrond Myklebust * 8157c1d71cfSTrond Myklebust * This attempts to break the connection if and only if 'cookie' matches 8167c1d71cfSTrond Myklebust * the current transport 'connection cookie'. It ensures that we don't 8177c1d71cfSTrond Myklebust * try to break the connection more than once when we need to retransmit 8187c1d71cfSTrond Myklebust * a batch of RPC requests. 8197c1d71cfSTrond Myklebust * 8207c1d71cfSTrond Myklebust */ 8217c1d71cfSTrond Myklebust void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) 8227c1d71cfSTrond Myklebust { 8237c1d71cfSTrond Myklebust /* Don't race with the test_bit() in xprt_clear_locked() */ 824b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 8257c1d71cfSTrond Myklebust if (cookie != xprt->connect_cookie) 8267c1d71cfSTrond Myklebust goto out; 8272c2ee6d2SNeilBrown if (test_bit(XPRT_CLOSING, &xprt->state)) 8287c1d71cfSTrond Myklebust goto out; 829e26d9972STrond Myklebust xprt_schedule_autoclose_locked(xprt); 8307c1d71cfSTrond Myklebust out: 831b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 8327c1d71cfSTrond Myklebust } 8337c1d71cfSTrond Myklebust 834ad3331acSTrond Myklebust static bool 835ad3331acSTrond Myklebust xprt_has_timer(const struct rpc_xprt *xprt) 836ad3331acSTrond Myklebust { 837ad3331acSTrond Myklebust return xprt->idle_timeout != 0; 838ad3331acSTrond Myklebust } 839ad3331acSTrond Myklebust 840ad3331acSTrond Myklebust static void 841ad3331acSTrond Myklebust xprt_schedule_autodisconnect(struct rpc_xprt *xprt) 842ad3331acSTrond Myklebust __must_hold(&xprt->transport_lock) 843ad3331acSTrond Myklebust { 84480d3c45fSDave Wysochanski xprt->last_used = jiffies; 84595f7691dSTrond Myklebust if (RB_EMPTY_ROOT(&xprt->recv_queue) && xprt_has_timer(xprt)) 846ad3331acSTrond Myklebust mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout); 847ad3331acSTrond Myklebust } 848ad3331acSTrond Myklebust 8491da177e4SLinus Torvalds static void 850ff861c4dSKees Cook xprt_init_autodisconnect(struct timer_list *t) 8511da177e4SLinus Torvalds { 852ff861c4dSKees Cook struct rpc_xprt *xprt = from_timer(xprt, t, timer); 8531da177e4SLinus Torvalds 85495f7691dSTrond Myklebust if (!RB_EMPTY_ROOT(&xprt->recv_queue)) 855b5e92419STrond Myklebust return; 856ad3331acSTrond Myklebust /* Reset xprt->last_used to avoid connect/autodisconnect cycling */ 857ad3331acSTrond Myklebust xprt->last_used = jiffies; 8582226feb6SChuck Lever if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) 8591da177e4SLinus Torvalds return; 860b5e92419STrond Myklebust queue_work(xprtiod_workqueue, &xprt->task_cleanup); 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds 863a4ae3081SChuck Lever #if IS_ENABLED(CONFIG_FAIL_SUNRPC) 864a4ae3081SChuck Lever static void xprt_inject_disconnect(struct rpc_xprt *xprt) 865a4ae3081SChuck Lever { 866a4ae3081SChuck Lever if (!fail_sunrpc.ignore_client_disconnect && 867a4ae3081SChuck Lever should_fail(&fail_sunrpc.attr, 1)) 868a4ae3081SChuck Lever xprt->ops->inject_disconnect(xprt); 869a4ae3081SChuck Lever } 870a4ae3081SChuck Lever #else 871a4ae3081SChuck Lever static inline void xprt_inject_disconnect(struct rpc_xprt *xprt) 872a4ae3081SChuck Lever { 873a4ae3081SChuck Lever } 874a4ae3081SChuck Lever #endif 875a4ae3081SChuck Lever 876718ba5b8STrond Myklebust bool xprt_lock_connect(struct rpc_xprt *xprt, 877718ba5b8STrond Myklebust struct rpc_task *task, 878718ba5b8STrond Myklebust void *cookie) 879718ba5b8STrond Myklebust { 880718ba5b8STrond Myklebust bool ret = false; 881718ba5b8STrond Myklebust 882b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 883718ba5b8STrond Myklebust if (!test_bit(XPRT_LOCKED, &xprt->state)) 884718ba5b8STrond Myklebust goto out; 885718ba5b8STrond Myklebust if (xprt->snd_task != task) 886718ba5b8STrond Myklebust goto out; 887c2dc3e5fSTrond Myklebust set_bit(XPRT_SND_IS_COOKIE, &xprt->state); 888718ba5b8STrond Myklebust xprt->snd_task = cookie; 889718ba5b8STrond Myklebust ret = true; 890718ba5b8STrond Myklebust out: 891b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 892718ba5b8STrond Myklebust return ret; 893718ba5b8STrond Myklebust } 894f99fa508STrond Myklebust EXPORT_SYMBOL_GPL(xprt_lock_connect); 895718ba5b8STrond Myklebust 896718ba5b8STrond Myklebust void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie) 897718ba5b8STrond Myklebust { 898b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 899718ba5b8STrond Myklebust if (xprt->snd_task != cookie) 900718ba5b8STrond Myklebust goto out; 901718ba5b8STrond Myklebust if (!test_bit(XPRT_LOCKED, &xprt->state)) 902718ba5b8STrond Myklebust goto out; 903718ba5b8STrond Myklebust xprt->snd_task =NULL; 904c2dc3e5fSTrond Myklebust clear_bit(XPRT_SND_IS_COOKIE, &xprt->state); 905718ba5b8STrond Myklebust xprt->ops->release_xprt(xprt, NULL); 906ad3331acSTrond Myklebust xprt_schedule_autodisconnect(xprt); 907718ba5b8STrond Myklebust out: 908b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 90979234c3dSTrond Myklebust wake_up_bit(&xprt->state, XPRT_LOCKED); 910718ba5b8STrond Myklebust } 911f99fa508STrond Myklebust EXPORT_SYMBOL_GPL(xprt_unlock_connect); 912718ba5b8STrond Myklebust 9139903cd1cSChuck Lever /** 9149903cd1cSChuck Lever * xprt_connect - schedule a transport connect operation 9159903cd1cSChuck Lever * @task: RPC task that is requesting the connect 9161da177e4SLinus Torvalds * 9171da177e4SLinus Torvalds */ 9181da177e4SLinus Torvalds void xprt_connect(struct rpc_task *task) 9191da177e4SLinus Torvalds { 920ad2368d6STrond Myklebust struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 9211da177e4SLinus Torvalds 922db0a86c4SChuck Lever trace_xprt_connect(xprt); 9231da177e4SLinus Torvalds 924ec739ef0SChuck Lever if (!xprt_bound(xprt)) { 92501d37c42STrond Myklebust task->tk_status = -EAGAIN; 9261da177e4SLinus Torvalds return; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds if (!xprt_lock_write(xprt, task)) 9291da177e4SLinus Torvalds return; 930feb8ca37STrond Myklebust 931911813d7SChuck Lever if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) { 932911813d7SChuck Lever trace_xprt_disconnect_cleanup(xprt); 933feb8ca37STrond Myklebust xprt->ops->close(xprt); 934911813d7SChuck Lever } 935feb8ca37STrond Myklebust 936718ba5b8STrond Myklebust if (!xprt_connected(xprt)) { 9372c2ee6d2SNeilBrown task->tk_rqstp->rq_connect_cookie = xprt->connect_cookie; 9386b2e6856STrond Myklebust rpc_sleep_on_timeout(&xprt->pending, task, NULL, 9399e910bffSTrond Myklebust xprt_request_timeout(task->tk_rqstp)); 9400b9e7943STrond Myklebust 9410b9e7943STrond Myklebust if (test_bit(XPRT_CLOSING, &xprt->state)) 9420b9e7943STrond Myklebust return; 9430b9e7943STrond Myklebust if (xprt_test_and_set_connecting(xprt)) 9440b9e7943STrond Myklebust return; 9450a9a4304STrond Myklebust /* Race breaker */ 9460a9a4304STrond Myklebust if (!xprt_connected(xprt)) { 947262ca07dSChuck Lever xprt->stat.connect_start = jiffies; 9481b092092STrond Myklebust xprt->ops->connect(xprt, task); 9490a9a4304STrond Myklebust } else { 9500a9a4304STrond Myklebust xprt_clear_connecting(xprt); 9510a9a4304STrond Myklebust task->tk_status = 0; 9520a9a4304STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, task); 9530a9a4304STrond Myklebust } 9541da177e4SLinus Torvalds } 955718ba5b8STrond Myklebust xprt_release_write(xprt, task); 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 958675dd90aSChuck Lever /** 959675dd90aSChuck Lever * xprt_reconnect_delay - compute the wait before scheduling a connect 960675dd90aSChuck Lever * @xprt: transport instance 961675dd90aSChuck Lever * 962675dd90aSChuck Lever */ 963675dd90aSChuck Lever unsigned long xprt_reconnect_delay(const struct rpc_xprt *xprt) 964675dd90aSChuck Lever { 965675dd90aSChuck Lever unsigned long start, now = jiffies; 966675dd90aSChuck Lever 967675dd90aSChuck Lever start = xprt->stat.connect_start + xprt->reestablish_timeout; 968675dd90aSChuck Lever if (time_after(start, now)) 969675dd90aSChuck Lever return start - now; 970675dd90aSChuck Lever return 0; 971675dd90aSChuck Lever } 972675dd90aSChuck Lever EXPORT_SYMBOL_GPL(xprt_reconnect_delay); 973675dd90aSChuck Lever 974675dd90aSChuck Lever /** 975675dd90aSChuck Lever * xprt_reconnect_backoff - compute the new re-establish timeout 976675dd90aSChuck Lever * @xprt: transport instance 977675dd90aSChuck Lever * @init_to: initial reestablish timeout 978675dd90aSChuck Lever * 979675dd90aSChuck Lever */ 980675dd90aSChuck Lever void xprt_reconnect_backoff(struct rpc_xprt *xprt, unsigned long init_to) 981675dd90aSChuck Lever { 982675dd90aSChuck Lever xprt->reestablish_timeout <<= 1; 983675dd90aSChuck Lever if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) 984675dd90aSChuck Lever xprt->reestablish_timeout = xprt->max_reconnect_timeout; 985675dd90aSChuck Lever if (xprt->reestablish_timeout < init_to) 986675dd90aSChuck Lever xprt->reestablish_timeout = init_to; 987675dd90aSChuck Lever } 988675dd90aSChuck Lever EXPORT_SYMBOL_GPL(xprt_reconnect_backoff); 989675dd90aSChuck Lever 99095f7691dSTrond Myklebust enum xprt_xid_rb_cmp { 99195f7691dSTrond Myklebust XID_RB_EQUAL, 99295f7691dSTrond Myklebust XID_RB_LEFT, 99395f7691dSTrond Myklebust XID_RB_RIGHT, 99495f7691dSTrond Myklebust }; 99595f7691dSTrond Myklebust static enum xprt_xid_rb_cmp 99695f7691dSTrond Myklebust xprt_xid_cmp(__be32 xid1, __be32 xid2) 99795f7691dSTrond Myklebust { 99895f7691dSTrond Myklebust if (xid1 == xid2) 99995f7691dSTrond Myklebust return XID_RB_EQUAL; 100095f7691dSTrond Myklebust if ((__force u32)xid1 < (__force u32)xid2) 100195f7691dSTrond Myklebust return XID_RB_LEFT; 100295f7691dSTrond Myklebust return XID_RB_RIGHT; 100395f7691dSTrond Myklebust } 100495f7691dSTrond Myklebust 100595f7691dSTrond Myklebust static struct rpc_rqst * 100695f7691dSTrond Myklebust xprt_request_rb_find(struct rpc_xprt *xprt, __be32 xid) 100795f7691dSTrond Myklebust { 100895f7691dSTrond Myklebust struct rb_node *n = xprt->recv_queue.rb_node; 100995f7691dSTrond Myklebust struct rpc_rqst *req; 101095f7691dSTrond Myklebust 101195f7691dSTrond Myklebust while (n != NULL) { 101295f7691dSTrond Myklebust req = rb_entry(n, struct rpc_rqst, rq_recv); 101395f7691dSTrond Myklebust switch (xprt_xid_cmp(xid, req->rq_xid)) { 101495f7691dSTrond Myklebust case XID_RB_LEFT: 101595f7691dSTrond Myklebust n = n->rb_left; 101695f7691dSTrond Myklebust break; 101795f7691dSTrond Myklebust case XID_RB_RIGHT: 101895f7691dSTrond Myklebust n = n->rb_right; 101995f7691dSTrond Myklebust break; 102095f7691dSTrond Myklebust case XID_RB_EQUAL: 102195f7691dSTrond Myklebust return req; 102295f7691dSTrond Myklebust } 102395f7691dSTrond Myklebust } 102495f7691dSTrond Myklebust return NULL; 102595f7691dSTrond Myklebust } 102695f7691dSTrond Myklebust 102795f7691dSTrond Myklebust static void 102895f7691dSTrond Myklebust xprt_request_rb_insert(struct rpc_xprt *xprt, struct rpc_rqst *new) 102995f7691dSTrond Myklebust { 103095f7691dSTrond Myklebust struct rb_node **p = &xprt->recv_queue.rb_node; 103195f7691dSTrond Myklebust struct rb_node *n = NULL; 103295f7691dSTrond Myklebust struct rpc_rqst *req; 103395f7691dSTrond Myklebust 103495f7691dSTrond Myklebust while (*p != NULL) { 103595f7691dSTrond Myklebust n = *p; 103695f7691dSTrond Myklebust req = rb_entry(n, struct rpc_rqst, rq_recv); 103795f7691dSTrond Myklebust switch(xprt_xid_cmp(new->rq_xid, req->rq_xid)) { 103895f7691dSTrond Myklebust case XID_RB_LEFT: 103995f7691dSTrond Myklebust p = &n->rb_left; 104095f7691dSTrond Myklebust break; 104195f7691dSTrond Myklebust case XID_RB_RIGHT: 104295f7691dSTrond Myklebust p = &n->rb_right; 104395f7691dSTrond Myklebust break; 104495f7691dSTrond Myklebust case XID_RB_EQUAL: 104595f7691dSTrond Myklebust WARN_ON_ONCE(new != req); 104695f7691dSTrond Myklebust return; 104795f7691dSTrond Myklebust } 104895f7691dSTrond Myklebust } 104995f7691dSTrond Myklebust rb_link_node(&new->rq_recv, n, p); 105095f7691dSTrond Myklebust rb_insert_color(&new->rq_recv, &xprt->recv_queue); 105195f7691dSTrond Myklebust } 105295f7691dSTrond Myklebust 105395f7691dSTrond Myklebust static void 105495f7691dSTrond Myklebust xprt_request_rb_remove(struct rpc_xprt *xprt, struct rpc_rqst *req) 105595f7691dSTrond Myklebust { 105695f7691dSTrond Myklebust rb_erase(&req->rq_recv, &xprt->recv_queue); 105795f7691dSTrond Myklebust } 105895f7691dSTrond Myklebust 10599903cd1cSChuck Lever /** 10609903cd1cSChuck Lever * xprt_lookup_rqst - find an RPC request corresponding to an XID 10619903cd1cSChuck Lever * @xprt: transport on which the original request was transmitted 10629903cd1cSChuck Lever * @xid: RPC XID of incoming reply 10639903cd1cSChuck Lever * 106475c84151STrond Myklebust * Caller holds xprt->queue_lock. 10651da177e4SLinus Torvalds */ 1066d8ed029dSAlexey Dobriyan struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) 10671da177e4SLinus Torvalds { 10688f3a6de3SPavel Emelyanov struct rpc_rqst *entry; 10691da177e4SLinus Torvalds 107095f7691dSTrond Myklebust entry = xprt_request_rb_find(xprt, xid); 107195f7691dSTrond Myklebust if (entry != NULL) { 10723705ad64SJeff Layton trace_xprt_lookup_rqst(xprt, xid, 0); 10730b87a46bSChuck Lever entry->rq_rtt = ktime_sub(ktime_get(), entry->rq_xtime); 1074262ca07dSChuck Lever return entry; 10753705ad64SJeff Layton } 107646121cf7SChuck Lever 107746121cf7SChuck Lever dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", 107846121cf7SChuck Lever ntohl(xid)); 10793705ad64SJeff Layton trace_xprt_lookup_rqst(xprt, xid, -ENOENT); 1080262ca07dSChuck Lever xprt->stat.bad_xids++; 1081262ca07dSChuck Lever return NULL; 10821da177e4SLinus Torvalds } 108312444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_lookup_rqst); 10841da177e4SLinus Torvalds 1085cf9946cdSTrond Myklebust static bool 1086cf9946cdSTrond Myklebust xprt_is_pinned_rqst(struct rpc_rqst *req) 1087cf9946cdSTrond Myklebust { 1088cf9946cdSTrond Myklebust return atomic_read(&req->rq_pin) != 0; 1089cf9946cdSTrond Myklebust } 1090cf9946cdSTrond Myklebust 1091729749bbSTrond Myklebust /** 1092729749bbSTrond Myklebust * xprt_pin_rqst - Pin a request on the transport receive list 1093729749bbSTrond Myklebust * @req: Request to pin 1094729749bbSTrond Myklebust * 1095729749bbSTrond Myklebust * Caller must ensure this is atomic with the call to xprt_lookup_rqst() 10961f7d1c73SChuck Lever * so should be holding xprt->queue_lock. 1097729749bbSTrond Myklebust */ 1098729749bbSTrond Myklebust void xprt_pin_rqst(struct rpc_rqst *req) 1099729749bbSTrond Myklebust { 1100cf9946cdSTrond Myklebust atomic_inc(&req->rq_pin); 1101729749bbSTrond Myklebust } 11029590d083SChuck Lever EXPORT_SYMBOL_GPL(xprt_pin_rqst); 1103729749bbSTrond Myklebust 1104729749bbSTrond Myklebust /** 1105729749bbSTrond Myklebust * xprt_unpin_rqst - Unpin a request on the transport receive list 1106729749bbSTrond Myklebust * @req: Request to pin 1107729749bbSTrond Myklebust * 11081f7d1c73SChuck Lever * Caller should be holding xprt->queue_lock. 1109729749bbSTrond Myklebust */ 1110729749bbSTrond Myklebust void xprt_unpin_rqst(struct rpc_rqst *req) 1111729749bbSTrond Myklebust { 1112cf9946cdSTrond Myklebust if (!test_bit(RPC_TASK_MSG_PIN_WAIT, &req->rq_task->tk_runstate)) { 1113cf9946cdSTrond Myklebust atomic_dec(&req->rq_pin); 1114cf9946cdSTrond Myklebust return; 1115cf9946cdSTrond Myklebust } 1116cf9946cdSTrond Myklebust if (atomic_dec_and_test(&req->rq_pin)) 1117cf9946cdSTrond Myklebust wake_up_var(&req->rq_pin); 1118729749bbSTrond Myklebust } 11199590d083SChuck Lever EXPORT_SYMBOL_GPL(xprt_unpin_rqst); 1120729749bbSTrond Myklebust 1121729749bbSTrond Myklebust static void xprt_wait_on_pinned_rqst(struct rpc_rqst *req) 1122729749bbSTrond Myklebust { 1123cf9946cdSTrond Myklebust wait_var_event(&req->rq_pin, !xprt_is_pinned_rqst(req)); 1124729749bbSTrond Myklebust } 1125729749bbSTrond Myklebust 1126edc81dcdSTrond Myklebust static bool 1127edc81dcdSTrond Myklebust xprt_request_data_received(struct rpc_task *task) 1128edc81dcdSTrond Myklebust { 1129edc81dcdSTrond Myklebust return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && 1130edc81dcdSTrond Myklebust READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) != 0; 1131edc81dcdSTrond Myklebust } 1132edc81dcdSTrond Myklebust 1133edc81dcdSTrond Myklebust static bool 1134edc81dcdSTrond Myklebust xprt_request_need_enqueue_receive(struct rpc_task *task, struct rpc_rqst *req) 1135edc81dcdSTrond Myklebust { 1136edc81dcdSTrond Myklebust return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && 1137edc81dcdSTrond Myklebust READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) == 0; 1138edc81dcdSTrond Myklebust } 1139edc81dcdSTrond Myklebust 1140edc81dcdSTrond Myklebust /** 1141edc81dcdSTrond Myklebust * xprt_request_enqueue_receive - Add an request to the receive queue 1142edc81dcdSTrond Myklebust * @task: RPC task 1143edc81dcdSTrond Myklebust * 1144edc81dcdSTrond Myklebust */ 1145edc81dcdSTrond Myklebust void 1146edc81dcdSTrond Myklebust xprt_request_enqueue_receive(struct rpc_task *task) 1147edc81dcdSTrond Myklebust { 1148edc81dcdSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1149edc81dcdSTrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 1150edc81dcdSTrond Myklebust 1151edc81dcdSTrond Myklebust if (!xprt_request_need_enqueue_receive(task, req)) 1152edc81dcdSTrond Myklebust return; 115375369089STrond Myklebust 115475369089STrond Myklebust xprt_request_prepare(task->tk_rqstp); 1155edc81dcdSTrond Myklebust spin_lock(&xprt->queue_lock); 1156edc81dcdSTrond Myklebust 1157edc81dcdSTrond Myklebust /* Update the softirq receive buffer */ 1158edc81dcdSTrond Myklebust memcpy(&req->rq_private_buf, &req->rq_rcv_buf, 1159edc81dcdSTrond Myklebust sizeof(req->rq_private_buf)); 1160edc81dcdSTrond Myklebust 1161edc81dcdSTrond Myklebust /* Add request to the receive list */ 116295f7691dSTrond Myklebust xprt_request_rb_insert(xprt, req); 1163edc81dcdSTrond Myklebust set_bit(RPC_TASK_NEED_RECV, &task->tk_runstate); 1164edc81dcdSTrond Myklebust spin_unlock(&xprt->queue_lock); 1165edc81dcdSTrond Myklebust 1166edc81dcdSTrond Myklebust /* Turn off autodisconnect */ 1167edc81dcdSTrond Myklebust del_singleshot_timer_sync(&xprt->timer); 1168edc81dcdSTrond Myklebust } 1169edc81dcdSTrond Myklebust 1170edc81dcdSTrond Myklebust /** 1171edc81dcdSTrond Myklebust * xprt_request_dequeue_receive_locked - Remove a request from the receive queue 1172edc81dcdSTrond Myklebust * @task: RPC task 1173edc81dcdSTrond Myklebust * 1174edc81dcdSTrond Myklebust * Caller must hold xprt->queue_lock. 1175edc81dcdSTrond Myklebust */ 1176edc81dcdSTrond Myklebust static void 1177edc81dcdSTrond Myklebust xprt_request_dequeue_receive_locked(struct rpc_task *task) 1178edc81dcdSTrond Myklebust { 117995f7691dSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 118095f7691dSTrond Myklebust 1181edc81dcdSTrond Myklebust if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) 118295f7691dSTrond Myklebust xprt_request_rb_remove(req->rq_xprt, req); 1183edc81dcdSTrond Myklebust } 1184edc81dcdSTrond Myklebust 1185ecd465eeSChuck Lever /** 1186ecd465eeSChuck Lever * xprt_update_rtt - Update RPC RTT statistics 1187ecd465eeSChuck Lever * @task: RPC request that recently completed 1188ecd465eeSChuck Lever * 118975c84151STrond Myklebust * Caller holds xprt->queue_lock. 1190ecd465eeSChuck Lever */ 1191ecd465eeSChuck Lever void xprt_update_rtt(struct rpc_task *task) 11921da177e4SLinus Torvalds { 11931570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 11941570c1e4SChuck Lever struct rpc_rtt *rtt = task->tk_client->cl_rtt; 119595c96174SEric Dumazet unsigned int timer = task->tk_msg.rpc_proc->p_timer; 1196d60dbb20STrond Myklebust long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); 11971570c1e4SChuck Lever 11981da177e4SLinus Torvalds if (timer) { 11991da177e4SLinus Torvalds if (req->rq_ntrans == 1) 1200ff839970SChuck Lever rpc_update_rtt(rtt, timer, m); 12011570c1e4SChuck Lever rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds } 1204ecd465eeSChuck Lever EXPORT_SYMBOL_GPL(xprt_update_rtt); 12051da177e4SLinus Torvalds 12061570c1e4SChuck Lever /** 12071570c1e4SChuck Lever * xprt_complete_rqst - called when reply processing is complete 12081570c1e4SChuck Lever * @task: RPC request that recently completed 12091570c1e4SChuck Lever * @copied: actual number of bytes received from the transport 12101570c1e4SChuck Lever * 121175c84151STrond Myklebust * Caller holds xprt->queue_lock. 12121570c1e4SChuck Lever */ 12131570c1e4SChuck Lever void xprt_complete_rqst(struct rpc_task *task, int copied) 12141570c1e4SChuck Lever { 12151570c1e4SChuck Lever struct rpc_rqst *req = task->tk_rqstp; 1216fda13939STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 12171da177e4SLinus Torvalds 1218fda13939STrond Myklebust xprt->stat.recvs++; 1219ef759a2eSChuck Lever 12201e799b67STrond Myklebust req->rq_private_buf.len = copied; 1221dd2b63d0SRicardo Labiaga /* Ensure all writes are done before we update */ 1222dd2b63d0SRicardo Labiaga /* req->rq_reply_bytes_recvd */ 122343ac3f29STrond Myklebust smp_wmb(); 1224dd2b63d0SRicardo Labiaga req->rq_reply_bytes_recvd = copied; 1225edc81dcdSTrond Myklebust xprt_request_dequeue_receive_locked(task); 1226fda13939STrond Myklebust rpc_wake_up_queued_task(&xprt->pending, task); 12271da177e4SLinus Torvalds } 122812444809S\"Talpey, Thomas\ EXPORT_SYMBOL_GPL(xprt_complete_rqst); 12291da177e4SLinus Torvalds 123046c0ee8bSChuck Lever static void xprt_timer(struct rpc_task *task) 12311da177e4SLinus Torvalds { 12321da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 12331da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 12341da177e4SLinus Torvalds 12355d00837bSTrond Myklebust if (task->tk_status != -ETIMEDOUT) 12365d00837bSTrond Myklebust return; 123746c0ee8bSChuck Lever 123882476d9fSChuck Lever trace_xprt_timer(xprt, req->rq_xid, task->tk_status); 1239dd2b63d0SRicardo Labiaga if (!req->rq_reply_bytes_recvd) { 124046c0ee8bSChuck Lever if (xprt->ops->timer) 12416a24dfb6STrond Myklebust xprt->ops->timer(xprt, task); 12425d00837bSTrond Myklebust } else 12435d00837bSTrond Myklebust task->tk_status = 0; 12441da177e4SLinus Torvalds } 12451da177e4SLinus Torvalds 12469903cd1cSChuck Lever /** 12478ba6a92dSTrond Myklebust * xprt_wait_for_reply_request_def - wait for reply 12488ba6a92dSTrond Myklebust * @task: pointer to rpc_task 12498ba6a92dSTrond Myklebust * 12508ba6a92dSTrond Myklebust * Set a request's retransmit timeout based on the transport's 12518ba6a92dSTrond Myklebust * default timeout parameters. Used by transports that don't adjust 12528ba6a92dSTrond Myklebust * the retransmit timeout based on round-trip time estimation, 12538ba6a92dSTrond Myklebust * and put the task to sleep on the pending queue. 12548ba6a92dSTrond Myklebust */ 12558ba6a92dSTrond Myklebust void xprt_wait_for_reply_request_def(struct rpc_task *task) 12568ba6a92dSTrond Myklebust { 12578ba6a92dSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 12588ba6a92dSTrond Myklebust 12596b2e6856STrond Myklebust rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, 12609e910bffSTrond Myklebust xprt_request_timeout(req)); 12618ba6a92dSTrond Myklebust } 12628ba6a92dSTrond Myklebust EXPORT_SYMBOL_GPL(xprt_wait_for_reply_request_def); 12638ba6a92dSTrond Myklebust 12648ba6a92dSTrond Myklebust /** 12658ba6a92dSTrond Myklebust * xprt_wait_for_reply_request_rtt - wait for reply using RTT estimator 12668ba6a92dSTrond Myklebust * @task: pointer to rpc_task 12678ba6a92dSTrond Myklebust * 12688ba6a92dSTrond Myklebust * Set a request's retransmit timeout using the RTT estimator, 12698ba6a92dSTrond Myklebust * and put the task to sleep on the pending queue. 12708ba6a92dSTrond Myklebust */ 12718ba6a92dSTrond Myklebust void xprt_wait_for_reply_request_rtt(struct rpc_task *task) 12728ba6a92dSTrond Myklebust { 12738ba6a92dSTrond Myklebust int timer = task->tk_msg.rpc_proc->p_timer; 12748ba6a92dSTrond Myklebust struct rpc_clnt *clnt = task->tk_client; 12758ba6a92dSTrond Myklebust struct rpc_rtt *rtt = clnt->cl_rtt; 12768ba6a92dSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 12778ba6a92dSTrond Myklebust unsigned long max_timeout = clnt->cl_timeout->to_maxval; 12786b2e6856STrond Myklebust unsigned long timeout; 12798ba6a92dSTrond Myklebust 12806b2e6856STrond Myklebust timeout = rpc_calc_rto(rtt, timer); 12816b2e6856STrond Myklebust timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; 12826b2e6856STrond Myklebust if (timeout > max_timeout || timeout == 0) 12836b2e6856STrond Myklebust timeout = max_timeout; 12846b2e6856STrond Myklebust rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, 12856b2e6856STrond Myklebust jiffies + timeout); 12868ba6a92dSTrond Myklebust } 12878ba6a92dSTrond Myklebust EXPORT_SYMBOL_GPL(xprt_wait_for_reply_request_rtt); 12888ba6a92dSTrond Myklebust 12898ba6a92dSTrond Myklebust /** 12907f3a1d1eSTrond Myklebust * xprt_request_wait_receive - wait for the reply to an RPC request 12917f3a1d1eSTrond Myklebust * @task: RPC task about to send a request 12927f3a1d1eSTrond Myklebust * 12937f3a1d1eSTrond Myklebust */ 12947f3a1d1eSTrond Myklebust void xprt_request_wait_receive(struct rpc_task *task) 12957f3a1d1eSTrond Myklebust { 12967f3a1d1eSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 12977f3a1d1eSTrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 12987f3a1d1eSTrond Myklebust 12997f3a1d1eSTrond Myklebust if (!test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) 13007f3a1d1eSTrond Myklebust return; 13017f3a1d1eSTrond Myklebust /* 13027f3a1d1eSTrond Myklebust * Sleep on the pending queue if we're expecting a reply. 13037f3a1d1eSTrond Myklebust * The spinlock ensures atomicity between the test of 13047f3a1d1eSTrond Myklebust * req->rq_reply_bytes_recvd, and the call to rpc_sleep_on(). 13057f3a1d1eSTrond Myklebust */ 13067f3a1d1eSTrond Myklebust spin_lock(&xprt->queue_lock); 13077f3a1d1eSTrond Myklebust if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) { 13088ba6a92dSTrond Myklebust xprt->ops->wait_for_reply_request(task); 13097f3a1d1eSTrond Myklebust /* 13107f3a1d1eSTrond Myklebust * Send an extra queue wakeup call if the 13117f3a1d1eSTrond Myklebust * connection was dropped in case the call to 13127f3a1d1eSTrond Myklebust * rpc_sleep_on() raced. 13137f3a1d1eSTrond Myklebust */ 13147f3a1d1eSTrond Myklebust if (xprt_request_retransmit_after_disconnect(task)) 13157f3a1d1eSTrond Myklebust rpc_wake_up_queued_task_set_status(&xprt->pending, 13167f3a1d1eSTrond Myklebust task, -ENOTCONN); 13177f3a1d1eSTrond Myklebust } 13187f3a1d1eSTrond Myklebust spin_unlock(&xprt->queue_lock); 13197f3a1d1eSTrond Myklebust } 13207f3a1d1eSTrond Myklebust 1321944b0429STrond Myklebust static bool 1322944b0429STrond Myklebust xprt_request_need_enqueue_transmit(struct rpc_task *task, struct rpc_rqst *req) 1323944b0429STrond Myklebust { 1324762e4e67STrond Myklebust return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); 1325944b0429STrond Myklebust } 1326944b0429STrond Myklebust 1327944b0429STrond Myklebust /** 1328944b0429STrond Myklebust * xprt_request_enqueue_transmit - queue a task for transmission 1329944b0429STrond Myklebust * @task: pointer to rpc_task 1330944b0429STrond Myklebust * 1331944b0429STrond Myklebust * Add a task to the transmission queue. 1332944b0429STrond Myklebust */ 1333944b0429STrond Myklebust void 1334944b0429STrond Myklebust xprt_request_enqueue_transmit(struct rpc_task *task) 1335944b0429STrond Myklebust { 1336918f3c1fSTrond Myklebust struct rpc_rqst *pos, *req = task->tk_rqstp; 1337944b0429STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 1338944b0429STrond Myklebust 1339944b0429STrond Myklebust if (xprt_request_need_enqueue_transmit(task, req)) { 1340e66721f0STrond Myklebust req->rq_bytes_sent = 0; 1341944b0429STrond Myklebust spin_lock(&xprt->queue_lock); 134275891f50STrond Myklebust /* 134375891f50STrond Myklebust * Requests that carry congestion control credits are added 134475891f50STrond Myklebust * to the head of the list to avoid starvation issues. 134575891f50STrond Myklebust */ 134675891f50STrond Myklebust if (req->rq_cong) { 134775891f50STrond Myklebust xprt_clear_congestion_window_wait(xprt); 134875891f50STrond Myklebust list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { 134975891f50STrond Myklebust if (pos->rq_cong) 135075891f50STrond Myklebust continue; 135175891f50STrond Myklebust /* Note: req is added _before_ pos */ 135275891f50STrond Myklebust list_add_tail(&req->rq_xmit, &pos->rq_xmit); 135375891f50STrond Myklebust INIT_LIST_HEAD(&req->rq_xmit2); 135475891f50STrond Myklebust goto out; 135575891f50STrond Myklebust } 135686aeee0eSTrond Myklebust } else if (RPC_IS_SWAPPER(task)) { 135786aeee0eSTrond Myklebust list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { 135886aeee0eSTrond Myklebust if (pos->rq_cong || pos->rq_bytes_sent) 135986aeee0eSTrond Myklebust continue; 136086aeee0eSTrond Myklebust if (RPC_IS_SWAPPER(pos->rq_task)) 136186aeee0eSTrond Myklebust continue; 136286aeee0eSTrond Myklebust /* Note: req is added _before_ pos */ 136386aeee0eSTrond Myklebust list_add_tail(&req->rq_xmit, &pos->rq_xmit); 136486aeee0eSTrond Myklebust INIT_LIST_HEAD(&req->rq_xmit2); 136586aeee0eSTrond Myklebust goto out; 136686aeee0eSTrond Myklebust } 1367deaa5c96SChuck Lever } else if (!req->rq_seqno) { 1368918f3c1fSTrond Myklebust list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { 1369918f3c1fSTrond Myklebust if (pos->rq_task->tk_owner != task->tk_owner) 1370918f3c1fSTrond Myklebust continue; 1371918f3c1fSTrond Myklebust list_add_tail(&req->rq_xmit2, &pos->rq_xmit2); 1372918f3c1fSTrond Myklebust INIT_LIST_HEAD(&req->rq_xmit); 1373918f3c1fSTrond Myklebust goto out; 1374918f3c1fSTrond Myklebust } 137575891f50STrond Myklebust } 1376944b0429STrond Myklebust list_add_tail(&req->rq_xmit, &xprt->xmit_queue); 1377918f3c1fSTrond Myklebust INIT_LIST_HEAD(&req->rq_xmit2); 1378918f3c1fSTrond Myklebust out: 1379d737e5d4STrond Myklebust atomic_long_inc(&xprt->xmit_queuelen); 1380944b0429STrond Myklebust set_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); 1381944b0429STrond Myklebust spin_unlock(&xprt->queue_lock); 1382944b0429STrond Myklebust } 1383944b0429STrond Myklebust } 1384944b0429STrond Myklebust 1385944b0429STrond Myklebust /** 1386944b0429STrond Myklebust * xprt_request_dequeue_transmit_locked - remove a task from the transmission queue 1387944b0429STrond Myklebust * @task: pointer to rpc_task 1388944b0429STrond Myklebust * 1389944b0429STrond Myklebust * Remove a task from the transmission queue 1390944b0429STrond Myklebust * Caller must hold xprt->queue_lock 1391944b0429STrond Myklebust */ 1392944b0429STrond Myklebust static void 1393944b0429STrond Myklebust xprt_request_dequeue_transmit_locked(struct rpc_task *task) 1394944b0429STrond Myklebust { 1395918f3c1fSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1396918f3c1fSTrond Myklebust 1397918f3c1fSTrond Myklebust if (!test_and_clear_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) 1398918f3c1fSTrond Myklebust return; 1399918f3c1fSTrond Myklebust if (!list_empty(&req->rq_xmit)) { 1400918f3c1fSTrond Myklebust list_del(&req->rq_xmit); 1401918f3c1fSTrond Myklebust if (!list_empty(&req->rq_xmit2)) { 1402918f3c1fSTrond Myklebust struct rpc_rqst *next = list_first_entry(&req->rq_xmit2, 1403918f3c1fSTrond Myklebust struct rpc_rqst, rq_xmit2); 1404918f3c1fSTrond Myklebust list_del(&req->rq_xmit2); 1405918f3c1fSTrond Myklebust list_add_tail(&next->rq_xmit, &next->rq_xprt->xmit_queue); 1406918f3c1fSTrond Myklebust } 1407918f3c1fSTrond Myklebust } else 1408918f3c1fSTrond Myklebust list_del(&req->rq_xmit2); 1409d737e5d4STrond Myklebust atomic_long_dec(&req->rq_xprt->xmit_queuelen); 1410944b0429STrond Myklebust } 1411944b0429STrond Myklebust 1412944b0429STrond Myklebust /** 1413944b0429STrond Myklebust * xprt_request_dequeue_transmit - remove a task from the transmission queue 1414944b0429STrond Myklebust * @task: pointer to rpc_task 1415944b0429STrond Myklebust * 1416944b0429STrond Myklebust * Remove a task from the transmission queue 1417944b0429STrond Myklebust */ 1418944b0429STrond Myklebust static void 1419944b0429STrond Myklebust xprt_request_dequeue_transmit(struct rpc_task *task) 1420944b0429STrond Myklebust { 1421944b0429STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1422944b0429STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 1423944b0429STrond Myklebust 1424944b0429STrond Myklebust spin_lock(&xprt->queue_lock); 1425944b0429STrond Myklebust xprt_request_dequeue_transmit_locked(task); 1426944b0429STrond Myklebust spin_unlock(&xprt->queue_lock); 1427944b0429STrond Myklebust } 1428944b0429STrond Myklebust 14297f3a1d1eSTrond Myklebust /** 1430cc204d01STrond Myklebust * xprt_request_dequeue_xprt - remove a task from the transmit+receive queue 1431cc204d01STrond Myklebust * @task: pointer to rpc_task 1432cc204d01STrond Myklebust * 1433cc204d01STrond Myklebust * Remove a task from the transmit and receive queues, and ensure that 1434cc204d01STrond Myklebust * it is not pinned by the receive work item. 1435cc204d01STrond Myklebust */ 1436cc204d01STrond Myklebust void 1437cc204d01STrond Myklebust xprt_request_dequeue_xprt(struct rpc_task *task) 1438cc204d01STrond Myklebust { 1439cc204d01STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1440cc204d01STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 1441cc204d01STrond Myklebust 1442cc204d01STrond Myklebust if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) || 1443cc204d01STrond Myklebust test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) || 1444cc204d01STrond Myklebust xprt_is_pinned_rqst(req)) { 1445cc204d01STrond Myklebust spin_lock(&xprt->queue_lock); 1446cc204d01STrond Myklebust xprt_request_dequeue_transmit_locked(task); 1447cc204d01STrond Myklebust xprt_request_dequeue_receive_locked(task); 1448cc204d01STrond Myklebust while (xprt_is_pinned_rqst(req)) { 1449cc204d01STrond Myklebust set_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); 1450cc204d01STrond Myklebust spin_unlock(&xprt->queue_lock); 1451cc204d01STrond Myklebust xprt_wait_on_pinned_rqst(req); 1452cc204d01STrond Myklebust spin_lock(&xprt->queue_lock); 1453cc204d01STrond Myklebust clear_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); 1454cc204d01STrond Myklebust } 1455cc204d01STrond Myklebust spin_unlock(&xprt->queue_lock); 1456cc204d01STrond Myklebust } 1457cc204d01STrond Myklebust } 1458cc204d01STrond Myklebust 1459cc204d01STrond Myklebust /** 14609d96acbcSTrond Myklebust * xprt_request_prepare - prepare an encoded request for transport 14619d96acbcSTrond Myklebust * @req: pointer to rpc_rqst 14629d96acbcSTrond Myklebust * 14639d96acbcSTrond Myklebust * Calls into the transport layer to do whatever is needed to prepare 14649d96acbcSTrond Myklebust * the request for transmission or receive. 14659d96acbcSTrond Myklebust */ 14669d96acbcSTrond Myklebust void 14679d96acbcSTrond Myklebust xprt_request_prepare(struct rpc_rqst *req) 14689d96acbcSTrond Myklebust { 14699d96acbcSTrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 14709d96acbcSTrond Myklebust 14719d96acbcSTrond Myklebust if (xprt->ops->prepare_request) 14729d96acbcSTrond Myklebust xprt->ops->prepare_request(req); 14739d96acbcSTrond Myklebust } 14749d96acbcSTrond Myklebust 14759d96acbcSTrond Myklebust /** 1476762e4e67STrond Myklebust * xprt_request_need_retransmit - Test if a task needs retransmission 1477762e4e67STrond Myklebust * @task: pointer to rpc_task 1478762e4e67STrond Myklebust * 1479762e4e67STrond Myklebust * Test for whether a connection breakage requires the task to retransmit 1480762e4e67STrond Myklebust */ 1481762e4e67STrond Myklebust bool 1482762e4e67STrond Myklebust xprt_request_need_retransmit(struct rpc_task *task) 1483762e4e67STrond Myklebust { 1484762e4e67STrond Myklebust return xprt_request_retransmit_after_disconnect(task); 1485762e4e67STrond Myklebust } 1486762e4e67STrond Myklebust 1487762e4e67STrond Myklebust /** 14889903cd1cSChuck Lever * xprt_prepare_transmit - reserve the transport before sending a request 14899903cd1cSChuck Lever * @task: RPC task about to send a request 14909903cd1cSChuck Lever * 14911da177e4SLinus Torvalds */ 149290051ea7STrond Myklebust bool xprt_prepare_transmit(struct rpc_task *task) 14931da177e4SLinus Torvalds { 14941da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 14951da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 14961da177e4SLinus Torvalds 14975f2f6bd9STrond Myklebust if (!xprt_lock_write(xprt, task)) { 14985f2f6bd9STrond Myklebust /* Race breaker: someone may have transmitted us */ 1499944b0429STrond Myklebust if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) 15005f2f6bd9STrond Myklebust rpc_wake_up_queued_task_set_status(&xprt->sending, 15015f2f6bd9STrond Myklebust task, 0); 15025f2f6bd9STrond Myklebust return false; 15035f2f6bd9STrond Myklebust 15048a19a0b6STrond Myklebust } 15055f2f6bd9STrond Myklebust return true; 15061da177e4SLinus Torvalds } 15071da177e4SLinus Torvalds 1508e0ab53deSTrond Myklebust void xprt_end_transmit(struct rpc_task *task) 15095e5ce5beSTrond Myklebust { 15107638e0bfSChuck Lever struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 15117638e0bfSChuck Lever 15127638e0bfSChuck Lever xprt_inject_disconnect(xprt); 15137638e0bfSChuck Lever xprt_release_write(xprt, task); 15145e5ce5beSTrond Myklebust } 15155e5ce5beSTrond Myklebust 15169903cd1cSChuck Lever /** 151789f90fe1STrond Myklebust * xprt_request_transmit - send an RPC request on a transport 151889f90fe1STrond Myklebust * @req: pointer to request to transmit 151989f90fe1STrond Myklebust * @snd_task: RPC task that owns the transport lock 15209903cd1cSChuck Lever * 152189f90fe1STrond Myklebust * This performs the transmission of a single request. 152289f90fe1STrond Myklebust * Note that if the request is not the same as snd_task, then it 152389f90fe1STrond Myklebust * does need to be pinned. 152489f90fe1STrond Myklebust * Returns '0' on success. 15259903cd1cSChuck Lever */ 152689f90fe1STrond Myklebust static int 152789f90fe1STrond Myklebust xprt_request_transmit(struct rpc_rqst *req, struct rpc_task *snd_task) 15281da177e4SLinus Torvalds { 15291da177e4SLinus Torvalds struct rpc_xprt *xprt = req->rq_xprt; 153089f90fe1STrond Myklebust struct rpc_task *task = req->rq_task; 153190d91b0cSTrond Myklebust unsigned int connect_cookie; 1532dcbbeda8STrond Myklebust int is_retrans = RPC_WAS_SENT(task); 1533ff699ea8SChuck Lever int status; 15341da177e4SLinus Torvalds 1535edc81dcdSTrond Myklebust if (!req->rq_bytes_sent) { 153689f90fe1STrond Myklebust if (xprt_request_data_received(task)) { 153789f90fe1STrond Myklebust status = 0; 1538944b0429STrond Myklebust goto out_dequeue; 153989f90fe1STrond Myklebust } 15403021a5bbSTrond Myklebust /* Verify that our message lies in the RPCSEC_GSS window */ 1541edc81dcdSTrond Myklebust if (rpcauth_xmit_need_reencode(task)) { 154289f90fe1STrond Myklebust status = -EBADMSG; 1543944b0429STrond Myklebust goto out_dequeue; 15443021a5bbSTrond Myklebust } 1545ae67bd38STrond Myklebust if (RPC_SIGNALLED(task)) { 1546ae67bd38STrond Myklebust status = -ERESTARTSYS; 1547ae67bd38STrond Myklebust goto out_dequeue; 1548ae67bd38STrond Myklebust } 15491da177e4SLinus Torvalds } 15501da177e4SLinus Torvalds 1551dcbbeda8STrond Myklebust /* 1552dcbbeda8STrond Myklebust * Update req->rq_ntrans before transmitting to avoid races with 1553dcbbeda8STrond Myklebust * xprt_update_rtt(), which needs to know that it is recording a 1554dcbbeda8STrond Myklebust * reply to the first transmission. 1555dcbbeda8STrond Myklebust */ 1556dcbbeda8STrond Myklebust req->rq_ntrans++; 1557dcbbeda8STrond Myklebust 1558c509f15aSChuck Lever trace_rpc_xdr_sendto(task, &req->rq_snd_buf); 155990d91b0cSTrond Myklebust connect_cookie = xprt->connect_cookie; 1560adfa7144STrond Myklebust status = xprt->ops->send_request(req); 1561c8485e4dSTrond Myklebust if (status != 0) { 1562dcbbeda8STrond Myklebust req->rq_ntrans--; 15630c77668dSChuck Lever trace_xprt_transmit(req, status); 156489f90fe1STrond Myklebust return status; 1565c8485e4dSTrond Myklebust } 15667ebbbc6eSTrond Myklebust 1567e936a597SChuck Lever if (is_retrans) { 1568dcbbeda8STrond Myklebust task->tk_client->cl_stats->rpcretrans++; 1569e936a597SChuck Lever trace_xprt_retransmit(req); 1570e936a597SChuck Lever } 1571dcbbeda8STrond Myklebust 15724a068258SChuck Lever xprt_inject_disconnect(xprt); 1573c8485e4dSTrond Myklebust 1574468f8613SBryan Schumaker task->tk_flags |= RPC_TASK_SENT; 1575b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 1576262ca07dSChuck Lever 1577262ca07dSChuck Lever xprt->stat.sends++; 1578262ca07dSChuck Lever xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; 1579262ca07dSChuck Lever xprt->stat.bklog_u += xprt->backlog.qlen; 158015a45206SAndy Adamson xprt->stat.sending_u += xprt->sending.qlen; 158115a45206SAndy Adamson xprt->stat.pending_u += xprt->pending.qlen; 1582b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 158390d91b0cSTrond Myklebust 158490d91b0cSTrond Myklebust req->rq_connect_cookie = connect_cookie; 1585944b0429STrond Myklebust out_dequeue: 15860c77668dSChuck Lever trace_xprt_transmit(req, status); 1587944b0429STrond Myklebust xprt_request_dequeue_transmit(task); 158889f90fe1STrond Myklebust rpc_wake_up_queued_task_set_status(&xprt->sending, task, status); 158989f90fe1STrond Myklebust return status; 159089f90fe1STrond Myklebust } 159189f90fe1STrond Myklebust 159289f90fe1STrond Myklebust /** 159389f90fe1STrond Myklebust * xprt_transmit - send an RPC request on a transport 159489f90fe1STrond Myklebust * @task: controlling RPC task 159589f90fe1STrond Myklebust * 159689f90fe1STrond Myklebust * Attempts to drain the transmit queue. On exit, either the transport 159789f90fe1STrond Myklebust * signalled an error that needs to be handled before transmission can 159889f90fe1STrond Myklebust * resume, or @task finished transmitting, and detected that it already 159989f90fe1STrond Myklebust * received a reply. 160089f90fe1STrond Myklebust */ 160189f90fe1STrond Myklebust void 160289f90fe1STrond Myklebust xprt_transmit(struct rpc_task *task) 160389f90fe1STrond Myklebust { 160489f90fe1STrond Myklebust struct rpc_rqst *next, *req = task->tk_rqstp; 160589f90fe1STrond Myklebust struct rpc_xprt *xprt = req->rq_xprt; 1606ea7a1019STrond Myklebust int status; 160789f90fe1STrond Myklebust 160889f90fe1STrond Myklebust spin_lock(&xprt->queue_lock); 1609ea7a1019STrond Myklebust for (;;) { 1610ea7a1019STrond Myklebust next = list_first_entry_or_null(&xprt->xmit_queue, 161189f90fe1STrond Myklebust struct rpc_rqst, rq_xmit); 1612ea7a1019STrond Myklebust if (!next) 1613ea7a1019STrond Myklebust break; 161489f90fe1STrond Myklebust xprt_pin_rqst(next); 161589f90fe1STrond Myklebust spin_unlock(&xprt->queue_lock); 161689f90fe1STrond Myklebust status = xprt_request_transmit(next, task); 161789f90fe1STrond Myklebust if (status == -EBADMSG && next != req) 161889f90fe1STrond Myklebust status = 0; 161989f90fe1STrond Myklebust spin_lock(&xprt->queue_lock); 162089f90fe1STrond Myklebust xprt_unpin_rqst(next); 1621ea7a1019STrond Myklebust if (status < 0) { 1622ea7a1019STrond Myklebust if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) 162389f90fe1STrond Myklebust task->tk_status = status; 162489f90fe1STrond Myklebust break; 162589f90fe1STrond Myklebust } 1626ea7a1019STrond Myklebust /* Was @task transmitted, and has it received a reply? */ 1627ea7a1019STrond Myklebust if (xprt_request_data_received(task) && 1628ea7a1019STrond Myklebust !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) 1629ea7a1019STrond Myklebust break; 1630ea7a1019STrond Myklebust cond_resched_lock(&xprt->queue_lock); 1631ea7a1019STrond Myklebust } 163289f90fe1STrond Myklebust spin_unlock(&xprt->queue_lock); 16331da177e4SLinus Torvalds } 16341da177e4SLinus Torvalds 1635e86be3a0STrond Myklebust static void xprt_complete_request_init(struct rpc_task *task) 1636e86be3a0STrond Myklebust { 1637e86be3a0STrond Myklebust if (task->tk_rqstp) 1638e86be3a0STrond Myklebust xprt_request_init(task); 1639e86be3a0STrond Myklebust } 1640e86be3a0STrond Myklebust 1641e86be3a0STrond Myklebust void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task) 1642ba60eb25STrond Myklebust { 1643ba60eb25STrond Myklebust set_bit(XPRT_CONGESTED, &xprt->state); 1644e86be3a0STrond Myklebust rpc_sleep_on(&xprt->backlog, task, xprt_complete_request_init); 1645ba60eb25STrond Myklebust } 1646e86be3a0STrond Myklebust EXPORT_SYMBOL_GPL(xprt_add_backlog); 1647ba60eb25STrond Myklebust 1648e877a88dSNeilBrown static bool __xprt_set_rq(struct rpc_task *task, void *data) 1649ba60eb25STrond Myklebust { 1650e877a88dSNeilBrown struct rpc_rqst *req = data; 1651e877a88dSNeilBrown 1652e877a88dSNeilBrown if (task->tk_rqstp == NULL) { 1653e877a88dSNeilBrown memset(req, 0, sizeof(*req)); /* mark unused */ 1654e877a88dSNeilBrown task->tk_rqstp = req; 1655e877a88dSNeilBrown return true; 1656e877a88dSNeilBrown } 1657e877a88dSNeilBrown return false; 1658e877a88dSNeilBrown } 1659e877a88dSNeilBrown 1660e86be3a0STrond Myklebust bool xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req) 1661e877a88dSNeilBrown { 1662e877a88dSNeilBrown if (rpc_wake_up_first(&xprt->backlog, __xprt_set_rq, req) == NULL) { 1663ba60eb25STrond Myklebust clear_bit(XPRT_CONGESTED, &xprt->state); 1664e877a88dSNeilBrown return false; 1665e877a88dSNeilBrown } 1666e877a88dSNeilBrown return true; 1667ba60eb25STrond Myklebust } 1668e86be3a0STrond Myklebust EXPORT_SYMBOL_GPL(xprt_wake_up_backlog); 1669ba60eb25STrond Myklebust 1670ba60eb25STrond Myklebust static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task) 1671ba60eb25STrond Myklebust { 1672ba60eb25STrond Myklebust bool ret = false; 1673ba60eb25STrond Myklebust 1674ba60eb25STrond Myklebust if (!test_bit(XPRT_CONGESTED, &xprt->state)) 1675ba60eb25STrond Myklebust goto out; 1676ba60eb25STrond Myklebust spin_lock(&xprt->reserve_lock); 1677ba60eb25STrond Myklebust if (test_bit(XPRT_CONGESTED, &xprt->state)) { 1678e86be3a0STrond Myklebust xprt_add_backlog(xprt, task); 1679ba60eb25STrond Myklebust ret = true; 1680ba60eb25STrond Myklebust } 1681ba60eb25STrond Myklebust spin_unlock(&xprt->reserve_lock); 1682ba60eb25STrond Myklebust out: 1683ba60eb25STrond Myklebust return ret; 1684ba60eb25STrond Myklebust } 1685ba60eb25STrond Myklebust 168692ea011fSTrond Myklebust static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt) 1687d9ba131dSTrond Myklebust { 1688d9ba131dSTrond Myklebust struct rpc_rqst *req = ERR_PTR(-EAGAIN); 1689d9ba131dSTrond Myklebust 1690ff699ea8SChuck Lever if (xprt->num_reqs >= xprt->max_reqs) 1691d9ba131dSTrond Myklebust goto out; 1692ff699ea8SChuck Lever ++xprt->num_reqs; 169392ea011fSTrond Myklebust spin_unlock(&xprt->reserve_lock); 169492ea011fSTrond Myklebust req = kzalloc(sizeof(struct rpc_rqst), GFP_NOFS); 169592ea011fSTrond Myklebust spin_lock(&xprt->reserve_lock); 1696d9ba131dSTrond Myklebust if (req != NULL) 1697d9ba131dSTrond Myklebust goto out; 1698ff699ea8SChuck Lever --xprt->num_reqs; 1699d9ba131dSTrond Myklebust req = ERR_PTR(-ENOMEM); 1700d9ba131dSTrond Myklebust out: 1701d9ba131dSTrond Myklebust return req; 1702d9ba131dSTrond Myklebust } 1703d9ba131dSTrond Myklebust 1704d9ba131dSTrond Myklebust static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) 1705d9ba131dSTrond Myklebust { 1706ff699ea8SChuck Lever if (xprt->num_reqs > xprt->min_reqs) { 1707ff699ea8SChuck Lever --xprt->num_reqs; 1708d9ba131dSTrond Myklebust kfree(req); 1709d9ba131dSTrond Myklebust return true; 1710d9ba131dSTrond Myklebust } 1711d9ba131dSTrond Myklebust return false; 1712d9ba131dSTrond Myklebust } 1713d9ba131dSTrond Myklebust 1714f39c1bfbSTrond Myklebust void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) 17151da177e4SLinus Torvalds { 1716d9ba131dSTrond Myklebust struct rpc_rqst *req; 17171da177e4SLinus Torvalds 1718f39c1bfbSTrond Myklebust spin_lock(&xprt->reserve_lock); 17191da177e4SLinus Torvalds if (!list_empty(&xprt->free)) { 1720d9ba131dSTrond Myklebust req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); 1721d9ba131dSTrond Myklebust list_del(&req->rq_list); 1722d9ba131dSTrond Myklebust goto out_init_req; 1723d9ba131dSTrond Myklebust } 172492ea011fSTrond Myklebust req = xprt_dynamic_alloc_slot(xprt); 1725d9ba131dSTrond Myklebust if (!IS_ERR(req)) 1726d9ba131dSTrond Myklebust goto out_init_req; 1727d9ba131dSTrond Myklebust switch (PTR_ERR(req)) { 1728d9ba131dSTrond Myklebust case -ENOMEM: 1729d9ba131dSTrond Myklebust dprintk("RPC: dynamic allocation of request slot " 1730d9ba131dSTrond Myklebust "failed! Retrying\n"); 17311afeaf5cSTrond Myklebust task->tk_status = -ENOMEM; 1732d9ba131dSTrond Myklebust break; 1733d9ba131dSTrond Myklebust case -EAGAIN: 1734ba60eb25STrond Myklebust xprt_add_backlog(xprt, task); 1735d9ba131dSTrond Myklebust dprintk("RPC: waiting for request slot\n"); 1736df561f66SGustavo A. R. Silva fallthrough; 17371afeaf5cSTrond Myklebust default: 1738d9ba131dSTrond Myklebust task->tk_status = -EAGAIN; 17391afeaf5cSTrond Myklebust } 1740f39c1bfbSTrond Myklebust spin_unlock(&xprt->reserve_lock); 1741d9ba131dSTrond Myklebust return; 1742d9ba131dSTrond Myklebust out_init_req: 1743ff699ea8SChuck Lever xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots, 1744ff699ea8SChuck Lever xprt->num_reqs); 174537ac86c3SChuck Lever spin_unlock(&xprt->reserve_lock); 174637ac86c3SChuck Lever 1747d9ba131dSTrond Myklebust task->tk_status = 0; 17481da177e4SLinus Torvalds task->tk_rqstp = req; 17491da177e4SLinus Torvalds } 1750f39c1bfbSTrond Myklebust EXPORT_SYMBOL_GPL(xprt_alloc_slot); 1751f39c1bfbSTrond Myklebust 1752a9cde23aSChuck Lever void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) 1753ee5ebe85STrond Myklebust { 1754ee5ebe85STrond Myklebust spin_lock(&xprt->reserve_lock); 1755e877a88dSNeilBrown if (!xprt_wake_up_backlog(xprt, req) && 1756e877a88dSNeilBrown !xprt_dynamic_free_slot(xprt, req)) { 1757c25573b5STrond Myklebust memset(req, 0, sizeof(*req)); /* mark unused */ 1758ee5ebe85STrond Myklebust list_add(&req->rq_list, &xprt->free); 1759c25573b5STrond Myklebust } 1760ee5ebe85STrond Myklebust spin_unlock(&xprt->reserve_lock); 1761ee5ebe85STrond Myklebust } 1762a9cde23aSChuck Lever EXPORT_SYMBOL_GPL(xprt_free_slot); 1763ee5ebe85STrond Myklebust 176421de0a95STrond Myklebust static void xprt_free_all_slots(struct rpc_xprt *xprt) 176521de0a95STrond Myklebust { 176621de0a95STrond Myklebust struct rpc_rqst *req; 176721de0a95STrond Myklebust while (!list_empty(&xprt->free)) { 176821de0a95STrond Myklebust req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); 176921de0a95STrond Myklebust list_del(&req->rq_list); 177021de0a95STrond Myklebust kfree(req); 177121de0a95STrond Myklebust } 177221de0a95STrond Myklebust } 177321de0a95STrond Myklebust 1774572caba4SOlga Kornievskaia static DEFINE_IDA(rpc_xprt_ids); 1775572caba4SOlga Kornievskaia 1776572caba4SOlga Kornievskaia void xprt_cleanup_ids(void) 1777572caba4SOlga Kornievskaia { 1778572caba4SOlga Kornievskaia ida_destroy(&rpc_xprt_ids); 1779572caba4SOlga Kornievskaia } 1780572caba4SOlga Kornievskaia 1781572caba4SOlga Kornievskaia static int xprt_alloc_id(struct rpc_xprt *xprt) 1782572caba4SOlga Kornievskaia { 1783572caba4SOlga Kornievskaia int id; 1784572caba4SOlga Kornievskaia 1785572caba4SOlga Kornievskaia id = ida_simple_get(&rpc_xprt_ids, 0, 0, GFP_KERNEL); 1786572caba4SOlga Kornievskaia if (id < 0) 1787572caba4SOlga Kornievskaia return id; 1788572caba4SOlga Kornievskaia 1789572caba4SOlga Kornievskaia xprt->id = id; 1790572caba4SOlga Kornievskaia return 0; 1791572caba4SOlga Kornievskaia } 1792572caba4SOlga Kornievskaia 1793572caba4SOlga Kornievskaia static void xprt_free_id(struct rpc_xprt *xprt) 1794572caba4SOlga Kornievskaia { 1795572caba4SOlga Kornievskaia ida_simple_remove(&rpc_xprt_ids, xprt->id); 1796572caba4SOlga Kornievskaia } 1797572caba4SOlga Kornievskaia 1798d9ba131dSTrond Myklebust struct rpc_xprt *xprt_alloc(struct net *net, size_t size, 1799d9ba131dSTrond Myklebust unsigned int num_prealloc, 1800d9ba131dSTrond Myklebust unsigned int max_alloc) 1801bd1722d4SPavel Emelyanov { 1802bd1722d4SPavel Emelyanov struct rpc_xprt *xprt; 180321de0a95STrond Myklebust struct rpc_rqst *req; 180421de0a95STrond Myklebust int i; 1805bd1722d4SPavel Emelyanov 1806bd1722d4SPavel Emelyanov xprt = kzalloc(size, GFP_KERNEL); 1807bd1722d4SPavel Emelyanov if (xprt == NULL) 1808bd1722d4SPavel Emelyanov goto out; 1809bd1722d4SPavel Emelyanov 1810572caba4SOlga Kornievskaia xprt_alloc_id(xprt); 181121de0a95STrond Myklebust xprt_init(xprt, net); 181221de0a95STrond Myklebust 181321de0a95STrond Myklebust for (i = 0; i < num_prealloc; i++) { 181421de0a95STrond Myklebust req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); 181521de0a95STrond Myklebust if (!req) 18168313164cSwangweidong goto out_free; 181721de0a95STrond Myklebust list_add(&req->rq_list, &xprt->free); 181821de0a95STrond Myklebust } 1819d9ba131dSTrond Myklebust if (max_alloc > num_prealloc) 1820d9ba131dSTrond Myklebust xprt->max_reqs = max_alloc; 1821d9ba131dSTrond Myklebust else 182221de0a95STrond Myklebust xprt->max_reqs = num_prealloc; 1823d9ba131dSTrond Myklebust xprt->min_reqs = num_prealloc; 1824ff699ea8SChuck Lever xprt->num_reqs = num_prealloc; 1825bd1722d4SPavel Emelyanov 1826bd1722d4SPavel Emelyanov return xprt; 1827bd1722d4SPavel Emelyanov 1828bd1722d4SPavel Emelyanov out_free: 182921de0a95STrond Myklebust xprt_free(xprt); 1830bd1722d4SPavel Emelyanov out: 1831bd1722d4SPavel Emelyanov return NULL; 1832bd1722d4SPavel Emelyanov } 1833bd1722d4SPavel Emelyanov EXPORT_SYMBOL_GPL(xprt_alloc); 1834bd1722d4SPavel Emelyanov 1835e204e621SPavel Emelyanov void xprt_free(struct rpc_xprt *xprt) 1836e204e621SPavel Emelyanov { 183737aa2133SPavel Emelyanov put_net(xprt->xprt_net); 183821de0a95STrond Myklebust xprt_free_all_slots(xprt); 1839572caba4SOlga Kornievskaia xprt_free_id(xprt); 1840587bc725SOlga Kornievskaia rpc_sysfs_xprt_destroy(xprt); 1841fda1bfefSTrond Myklebust kfree_rcu(xprt, rcu); 1842e204e621SPavel Emelyanov } 1843e204e621SPavel Emelyanov EXPORT_SYMBOL_GPL(xprt_free); 1844e204e621SPavel Emelyanov 1845902c5887STrond Myklebust static void 1846902c5887STrond Myklebust xprt_init_connect_cookie(struct rpc_rqst *req, struct rpc_xprt *xprt) 1847902c5887STrond Myklebust { 1848902c5887STrond Myklebust req->rq_connect_cookie = xprt_connect_cookie(xprt) - 1; 1849902c5887STrond Myklebust } 1850902c5887STrond Myklebust 18519dc6edcfSTrond Myklebust static __be32 18529dc6edcfSTrond Myklebust xprt_alloc_xid(struct rpc_xprt *xprt) 18539dc6edcfSTrond Myklebust { 18549dc6edcfSTrond Myklebust __be32 xid; 18559dc6edcfSTrond Myklebust 18569dc6edcfSTrond Myklebust spin_lock(&xprt->reserve_lock); 18579dc6edcfSTrond Myklebust xid = (__force __be32)xprt->xid++; 18589dc6edcfSTrond Myklebust spin_unlock(&xprt->reserve_lock); 18599dc6edcfSTrond Myklebust return xid; 18609dc6edcfSTrond Myklebust } 18619dc6edcfSTrond Myklebust 18629dc6edcfSTrond Myklebust static void 18639dc6edcfSTrond Myklebust xprt_init_xid(struct rpc_xprt *xprt) 18649dc6edcfSTrond Myklebust { 18659dc6edcfSTrond Myklebust xprt->xid = prandom_u32(); 18669dc6edcfSTrond Myklebust } 18679dc6edcfSTrond Myklebust 18689dc6edcfSTrond Myklebust static void 18699dc6edcfSTrond Myklebust xprt_request_init(struct rpc_task *task) 18709dc6edcfSTrond Myklebust { 18719dc6edcfSTrond Myklebust struct rpc_xprt *xprt = task->tk_xprt; 18729dc6edcfSTrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 18739dc6edcfSTrond Myklebust 18749dc6edcfSTrond Myklebust req->rq_task = task; 18759dc6edcfSTrond Myklebust req->rq_xprt = xprt; 18769dc6edcfSTrond Myklebust req->rq_buffer = NULL; 18779dc6edcfSTrond Myklebust req->rq_xid = xprt_alloc_xid(xprt); 1878902c5887STrond Myklebust xprt_init_connect_cookie(req, xprt); 18799dc6edcfSTrond Myklebust req->rq_snd_buf.len = 0; 18809dc6edcfSTrond Myklebust req->rq_snd_buf.buflen = 0; 18819dc6edcfSTrond Myklebust req->rq_rcv_buf.len = 0; 18829dc6edcfSTrond Myklebust req->rq_rcv_buf.buflen = 0; 188371700bb9STrond Myklebust req->rq_snd_buf.bvec = NULL; 188471700bb9STrond Myklebust req->rq_rcv_buf.bvec = NULL; 18859dc6edcfSTrond Myklebust req->rq_release_snd_buf = NULL; 1886da953063STrond Myklebust xprt_init_majortimeo(task, req); 188709d2ba0cSChuck Lever 188809d2ba0cSChuck Lever trace_xprt_reserve(req); 18899dc6edcfSTrond Myklebust } 18909dc6edcfSTrond Myklebust 18919dc6edcfSTrond Myklebust static void 18929dc6edcfSTrond Myklebust xprt_do_reserve(struct rpc_xprt *xprt, struct rpc_task *task) 18939dc6edcfSTrond Myklebust { 18949dc6edcfSTrond Myklebust xprt->ops->alloc_slot(xprt, task); 18959dc6edcfSTrond Myklebust if (task->tk_rqstp != NULL) 18969dc6edcfSTrond Myklebust xprt_request_init(task); 18979dc6edcfSTrond Myklebust } 18989dc6edcfSTrond Myklebust 18999903cd1cSChuck Lever /** 19009903cd1cSChuck Lever * xprt_reserve - allocate an RPC request slot 19019903cd1cSChuck Lever * @task: RPC task requesting a slot allocation 19029903cd1cSChuck Lever * 1903ba60eb25STrond Myklebust * If the transport is marked as being congested, or if no more 1904ba60eb25STrond Myklebust * slots are available, place the task on the transport's 19059903cd1cSChuck Lever * backlog queue. 19069903cd1cSChuck Lever */ 19079903cd1cSChuck Lever void xprt_reserve(struct rpc_task *task) 19081da177e4SLinus Torvalds { 1909fb43d172STrond Myklebust struct rpc_xprt *xprt = task->tk_xprt; 19101da177e4SLinus Torvalds 191143cedbf0STrond Myklebust task->tk_status = 0; 191243cedbf0STrond Myklebust if (task->tk_rqstp != NULL) 191343cedbf0STrond Myklebust return; 191443cedbf0STrond Myklebust 191543cedbf0STrond Myklebust task->tk_status = -EAGAIN; 1916ba60eb25STrond Myklebust if (!xprt_throttle_congested(xprt, task)) 19179dc6edcfSTrond Myklebust xprt_do_reserve(xprt, task); 1918ba60eb25STrond Myklebust } 1919ba60eb25STrond Myklebust 1920ba60eb25STrond Myklebust /** 1921ba60eb25STrond Myklebust * xprt_retry_reserve - allocate an RPC request slot 1922ba60eb25STrond Myklebust * @task: RPC task requesting a slot allocation 1923ba60eb25STrond Myklebust * 1924ba60eb25STrond Myklebust * If no more slots are available, place the task on the transport's 1925ba60eb25STrond Myklebust * backlog queue. 1926ba60eb25STrond Myklebust * Note that the only difference with xprt_reserve is that we now 1927ba60eb25STrond Myklebust * ignore the value of the XPRT_CONGESTED flag. 1928ba60eb25STrond Myklebust */ 1929ba60eb25STrond Myklebust void xprt_retry_reserve(struct rpc_task *task) 1930ba60eb25STrond Myklebust { 1931fb43d172STrond Myklebust struct rpc_xprt *xprt = task->tk_xprt; 1932ba60eb25STrond Myklebust 1933ba60eb25STrond Myklebust task->tk_status = 0; 1934e86be3a0STrond Myklebust if (task->tk_rqstp != NULL) 1935ba60eb25STrond Myklebust return; 1936ba60eb25STrond Myklebust 1937ba60eb25STrond Myklebust task->tk_status = -EAGAIN; 19389dc6edcfSTrond Myklebust xprt_do_reserve(xprt, task); 19391da177e4SLinus Torvalds } 19401da177e4SLinus Torvalds 19419903cd1cSChuck Lever /** 19429903cd1cSChuck Lever * xprt_release - release an RPC request slot 19439903cd1cSChuck Lever * @task: task which is finished with the slot 19449903cd1cSChuck Lever * 19451da177e4SLinus Torvalds */ 19469903cd1cSChuck Lever void xprt_release(struct rpc_task *task) 19471da177e4SLinus Torvalds { 194855ae1aabSRicardo Labiaga struct rpc_xprt *xprt; 194987ed5003STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 19501da177e4SLinus Torvalds 195187ed5003STrond Myklebust if (req == NULL) { 195287ed5003STrond Myklebust if (task->tk_client) { 1953fb43d172STrond Myklebust xprt = task->tk_xprt; 195487ed5003STrond Myklebust xprt_release_write(xprt, task); 195587ed5003STrond Myklebust } 19561da177e4SLinus Torvalds return; 195787ed5003STrond Myklebust } 195855ae1aabSRicardo Labiaga 195955ae1aabSRicardo Labiaga xprt = req->rq_xprt; 1960cc204d01STrond Myklebust xprt_request_dequeue_xprt(task); 1961b5e92419STrond Myklebust spin_lock(&xprt->transport_lock); 196249e9a890SChuck Lever xprt->ops->release_xprt(xprt, task); 1963a58dd398SChuck Lever if (xprt->ops->release_request) 1964a58dd398SChuck Lever xprt->ops->release_request(task); 1965ad3331acSTrond Myklebust xprt_schedule_autodisconnect(xprt); 1966b5e92419STrond Myklebust spin_unlock(&xprt->transport_lock); 1967ee5ebe85STrond Myklebust if (req->rq_buffer) 19683435c74aSChuck Lever xprt->ops->buf_free(task); 19699d96acbcSTrond Myklebust xdr_free_bvec(&req->rq_rcv_buf); 19700472e476STrond Myklebust xdr_free_bvec(&req->rq_snd_buf); 1971a17c2153STrond Myklebust if (req->rq_cred != NULL) 1972a17c2153STrond Myklebust put_rpccred(req->rq_cred); 1973ead5e1c2SJ. Bruce Fields if (req->rq_release_snd_buf) 1974ead5e1c2SJ. Bruce Fields req->rq_release_snd_buf(req); 197555ae1aabSRicardo Labiaga 1976e877a88dSNeilBrown task->tk_rqstp = NULL; 1977ee5ebe85STrond Myklebust if (likely(!bc_prealloc(req))) 1978a9cde23aSChuck Lever xprt->ops->free_slot(xprt, req); 1979ee5ebe85STrond Myklebust else 1980c9acb42eSTrond Myklebust xprt_free_bc_request(req); 19811da177e4SLinus Torvalds } 19821da177e4SLinus Torvalds 1983902c5887STrond Myklebust #ifdef CONFIG_SUNRPC_BACKCHANNEL 1984902c5887STrond Myklebust void 1985902c5887STrond Myklebust xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task) 1986902c5887STrond Myklebust { 1987902c5887STrond Myklebust struct xdr_buf *xbufp = &req->rq_snd_buf; 1988902c5887STrond Myklebust 1989902c5887STrond Myklebust task->tk_rqstp = req; 1990902c5887STrond Myklebust req->rq_task = task; 1991902c5887STrond Myklebust xprt_init_connect_cookie(req, req->rq_xprt); 1992902c5887STrond Myklebust /* 1993902c5887STrond Myklebust * Set up the xdr_buf length. 1994902c5887STrond Myklebust * This also indicates that the buffer is XDR encoded already. 1995902c5887STrond Myklebust */ 1996902c5887STrond Myklebust xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + 1997902c5887STrond Myklebust xbufp->tail[0].iov_len; 1998902c5887STrond Myklebust } 1999902c5887STrond Myklebust #endif 2000902c5887STrond Myklebust 200121de0a95STrond Myklebust static void xprt_init(struct rpc_xprt *xprt, struct net *net) 2002c2866763SChuck Lever { 200330c5116bSTrond Myklebust kref_init(&xprt->kref); 2004c2866763SChuck Lever 2005c2866763SChuck Lever spin_lock_init(&xprt->transport_lock); 2006c2866763SChuck Lever spin_lock_init(&xprt->reserve_lock); 200775c84151STrond Myklebust spin_lock_init(&xprt->queue_lock); 2008c2866763SChuck Lever 2009c2866763SChuck Lever INIT_LIST_HEAD(&xprt->free); 201095f7691dSTrond Myklebust xprt->recv_queue = RB_ROOT; 2011944b0429STrond Myklebust INIT_LIST_HEAD(&xprt->xmit_queue); 20129e00abc3STrond Myklebust #if defined(CONFIG_SUNRPC_BACKCHANNEL) 2013f9acac1aSRicardo Labiaga spin_lock_init(&xprt->bc_pa_lock); 2014f9acac1aSRicardo Labiaga INIT_LIST_HEAD(&xprt->bc_pa_list); 20159e00abc3STrond Myklebust #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 201680b14d5eSTrond Myklebust INIT_LIST_HEAD(&xprt->xprt_switch); 2017f9acac1aSRicardo Labiaga 2018c2866763SChuck Lever xprt->last_used = jiffies; 2019c2866763SChuck Lever xprt->cwnd = RPC_INITCWND; 2020a509050bSChuck Lever xprt->bind_index = 0; 2021c2866763SChuck Lever 2022c2866763SChuck Lever rpc_init_wait_queue(&xprt->binding, "xprt_binding"); 2023c2866763SChuck Lever rpc_init_wait_queue(&xprt->pending, "xprt_pending"); 202479c99152STrond Myklebust rpc_init_wait_queue(&xprt->sending, "xprt_sending"); 2025c2866763SChuck Lever rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); 2026c2866763SChuck Lever 2027c2866763SChuck Lever xprt_init_xid(xprt); 2028c2866763SChuck Lever 202921de0a95STrond Myklebust xprt->xprt_net = get_net(net); 20308d9266ffSTrond Myklebust } 20318d9266ffSTrond Myklebust 20328d9266ffSTrond Myklebust /** 20338d9266ffSTrond Myklebust * xprt_create_transport - create an RPC transport 20348d9266ffSTrond Myklebust * @args: rpc transport creation arguments 20358d9266ffSTrond Myklebust * 20368d9266ffSTrond Myklebust */ 20378d9266ffSTrond Myklebust struct rpc_xprt *xprt_create_transport(struct xprt_create *args) 20388d9266ffSTrond Myklebust { 20398d9266ffSTrond Myklebust struct rpc_xprt *xprt; 20409bccd264STrond Myklebust const struct xprt_class *t; 20418d9266ffSTrond Myklebust 20429bccd264STrond Myklebust t = xprt_class_find_by_ident(args->ident); 20439bccd264STrond Myklebust if (!t) { 20443c45ddf8SChuck Lever dprintk("RPC: transport (%d) not supported\n", args->ident); 20458d9266ffSTrond Myklebust return ERR_PTR(-EIO); 20469bccd264STrond Myklebust } 20478d9266ffSTrond Myklebust 20488d9266ffSTrond Myklebust xprt = t->setup(args); 20499bccd264STrond Myklebust xprt_class_release(t); 20509bccd264STrond Myklebust 2051911813d7SChuck Lever if (IS_ERR(xprt)) 205221de0a95STrond Myklebust goto out; 205333d90ac0SJ. Bruce Fields if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) 205433d90ac0SJ. Bruce Fields xprt->idle_timeout = 0; 205521de0a95STrond Myklebust INIT_WORK(&xprt->task_cleanup, xprt_autoclose); 205621de0a95STrond Myklebust if (xprt_has_timer(xprt)) 2057502980e8SAnna Schumaker timer_setup(&xprt->timer, xprt_init_autodisconnect, 0); 205821de0a95STrond Myklebust else 2059ff861c4dSKees Cook timer_setup(&xprt->timer, NULL, 0); 20604e0038b6STrond Myklebust 20614e0038b6STrond Myklebust if (strlen(args->servername) > RPC_MAXNETNAMELEN) { 20624e0038b6STrond Myklebust xprt_destroy(xprt); 20634e0038b6STrond Myklebust return ERR_PTR(-EINVAL); 20644e0038b6STrond Myklebust } 20654e0038b6STrond Myklebust xprt->servername = kstrdup(args->servername, GFP_KERNEL); 20664e0038b6STrond Myklebust if (xprt->servername == NULL) { 20674e0038b6STrond Myklebust xprt_destroy(xprt); 20684e0038b6STrond Myklebust return ERR_PTR(-ENOMEM); 20694e0038b6STrond Myklebust } 20704e0038b6STrond Myklebust 20713f940098SJeff Layton rpc_xprt_debugfs_register(xprt); 2072388f0c77SJeff Layton 2073911813d7SChuck Lever trace_xprt_create(xprt); 207421de0a95STrond Myklebust out: 2075c2866763SChuck Lever return xprt; 2076c2866763SChuck Lever } 2077c2866763SChuck Lever 2078528fd354STrond Myklebust static void xprt_destroy_cb(struct work_struct *work) 2079528fd354STrond Myklebust { 2080528fd354STrond Myklebust struct rpc_xprt *xprt = 2081528fd354STrond Myklebust container_of(work, struct rpc_xprt, task_cleanup); 2082528fd354STrond Myklebust 2083911813d7SChuck Lever trace_xprt_destroy(xprt); 2084911813d7SChuck Lever 2085528fd354STrond Myklebust rpc_xprt_debugfs_unregister(xprt); 2086528fd354STrond Myklebust rpc_destroy_wait_queue(&xprt->binding); 2087528fd354STrond Myklebust rpc_destroy_wait_queue(&xprt->pending); 2088528fd354STrond Myklebust rpc_destroy_wait_queue(&xprt->sending); 2089528fd354STrond Myklebust rpc_destroy_wait_queue(&xprt->backlog); 2090528fd354STrond Myklebust kfree(xprt->servername); 2091528fd354STrond Myklebust /* 2092669996adSTrond Myklebust * Destroy any existing back channel 2093669996adSTrond Myklebust */ 2094669996adSTrond Myklebust xprt_destroy_backchannel(xprt, UINT_MAX); 2095669996adSTrond Myklebust 2096669996adSTrond Myklebust /* 2097528fd354STrond Myklebust * Tear down transport state and free the rpc_xprt 2098528fd354STrond Myklebust */ 2099528fd354STrond Myklebust xprt->ops->destroy(xprt); 2100528fd354STrond Myklebust } 2101528fd354STrond Myklebust 21029903cd1cSChuck Lever /** 21039903cd1cSChuck Lever * xprt_destroy - destroy an RPC transport, killing off all requests. 2104a8de240aSTrond Myklebust * @xprt: transport to destroy 21059903cd1cSChuck Lever * 21061da177e4SLinus Torvalds */ 2107a8de240aSTrond Myklebust static void xprt_destroy(struct rpc_xprt *xprt) 21081da177e4SLinus Torvalds { 2109528fd354STrond Myklebust /* 2110528fd354STrond Myklebust * Exclude transport connect/disconnect handlers and autoclose 2111528fd354STrond Myklebust */ 211279234c3dSTrond Myklebust wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); 211379234c3dSTrond Myklebust 21140065db32STrond Myklebust del_timer_sync(&xprt->timer); 2115c8541ecdSChuck Lever 2116c8541ecdSChuck Lever /* 2117528fd354STrond Myklebust * Destroy sockets etc from the system workqueue so they can 2118528fd354STrond Myklebust * safely flush receive work running on rpciod. 2119c8541ecdSChuck Lever */ 2120528fd354STrond Myklebust INIT_WORK(&xprt->task_cleanup, xprt_destroy_cb); 2121528fd354STrond Myklebust schedule_work(&xprt->task_cleanup); 21226b6ca86bSTrond Myklebust } 21231da177e4SLinus Torvalds 212430c5116bSTrond Myklebust static void xprt_destroy_kref(struct kref *kref) 212530c5116bSTrond Myklebust { 212630c5116bSTrond Myklebust xprt_destroy(container_of(kref, struct rpc_xprt, kref)); 212730c5116bSTrond Myklebust } 212830c5116bSTrond Myklebust 212930c5116bSTrond Myklebust /** 213030c5116bSTrond Myklebust * xprt_get - return a reference to an RPC transport. 213130c5116bSTrond Myklebust * @xprt: pointer to the transport 213230c5116bSTrond Myklebust * 213330c5116bSTrond Myklebust */ 213430c5116bSTrond Myklebust struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) 213530c5116bSTrond Myklebust { 213630c5116bSTrond Myklebust if (xprt != NULL && kref_get_unless_zero(&xprt->kref)) 213730c5116bSTrond Myklebust return xprt; 213830c5116bSTrond Myklebust return NULL; 213930c5116bSTrond Myklebust } 214030c5116bSTrond Myklebust EXPORT_SYMBOL_GPL(xprt_get); 214130c5116bSTrond Myklebust 21426b6ca86bSTrond Myklebust /** 21436b6ca86bSTrond Myklebust * xprt_put - release a reference to an RPC transport. 21446b6ca86bSTrond Myklebust * @xprt: pointer to the transport 21456b6ca86bSTrond Myklebust * 21466b6ca86bSTrond Myklebust */ 21476b6ca86bSTrond Myklebust void xprt_put(struct rpc_xprt *xprt) 21486b6ca86bSTrond Myklebust { 214930c5116bSTrond Myklebust if (xprt != NULL) 215030c5116bSTrond Myklebust kref_put(&xprt->kref, xprt_destroy_kref); 21516b6ca86bSTrond Myklebust } 21525d252f90SChuck Lever EXPORT_SYMBOL_GPL(xprt_put); 2153