Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/xprt.c |
| 3 | * |
| 4 | * This is a generic RPC call interface supporting congestion avoidance, |
| 5 | * and asynchronous calls. |
| 6 | * |
| 7 | * The interface works like this: |
| 8 | * |
| 9 | * - When a process places a call, it allocates a request slot if |
| 10 | * one is available. Otherwise, it sleeps on the backlog queue |
| 11 | * (xprt_reserve). |
| 12 | * - Next, the caller puts together the RPC message, stuffs it into |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 13 | * the request struct, and calls xprt_transmit(). |
| 14 | * - xprt_transmit sends the message and installs the caller on the |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 15 | * transport's wait list. At the same time, if a reply is expected, |
| 16 | * it installs a timer that is run after the packet's timeout has |
| 17 | * expired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * - When a packet arrives, the data_ready handler walks the list of |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 19 | * pending requests for that transport. If a matching XID is found, the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * caller is woken up, and the timer removed. |
| 21 | * - When no reply arrives within the timeout interval, the timer is |
| 22 | * fired by the kernel and runs xprt_timer(). It either adjusts the |
| 23 | * timeout values (minor timeout) or wakes up the caller with a status |
| 24 | * of -ETIMEDOUT. |
| 25 | * - When the caller receives a notification from RPC that a reply arrived, |
| 26 | * it should release the RPC slot, and process the reply. |
| 27 | * If the call timed out, it may choose to retry the operation by |
| 28 | * adjusting the initial timeout value, and simply calling rpc_call |
| 29 | * again. |
| 30 | * |
| 31 | * Support for async RPC is done through a set of RPC-specific scheduling |
| 32 | * primitives that `transparently' work for processes as well as async |
| 33 | * tasks that rely on callbacks. |
| 34 | * |
| 35 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 36 | * |
| 37 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
| 39 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 40 | #include <linux/module.h> |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/types.h> |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 43 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/workqueue.h> |
Chuck Lever | bf3fcf8 | 2006-05-25 01:40:51 -0400 | [diff] [blame] | 45 | #include <linux/net.h> |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 46 | #include <linux/ktime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 48 | #include <linux/sunrpc/clnt.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 49 | #include <linux/sunrpc/metrics.h> |
Trond Myklebust | c9acb42 | 2010-03-19 15:36:22 -0400 | [diff] [blame] | 50 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 52 | #include <trace/events/sunrpc.h> |
| 53 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 54 | #include "sunrpc.h" |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | /* |
| 57 | * Local variables |
| 58 | */ |
| 59 | |
| 60 | #ifdef RPC_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | # define RPCDBG_FACILITY RPCDBG_XPRT |
| 62 | #endif |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | /* |
| 65 | * Local functions |
| 66 | */ |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 67 | static void xprt_init(struct rpc_xprt *xprt, struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | static void xprt_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
Trond Myklebust | 4e0038b | 2012-03-01 17:01:05 -0500 | [diff] [blame] | 71 | static void xprt_destroy(struct rpc_xprt *xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Jiri Slaby | 5ba03e8 | 2007-11-22 19:40:22 +0800 | [diff] [blame] | 73 | static DEFINE_SPINLOCK(xprt_list_lock); |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 74 | static LIST_HEAD(xprt_list); |
| 75 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 76 | /** |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 77 | * xprt_register_transport - register a transport implementation |
| 78 | * @transport: transport to register |
| 79 | * |
| 80 | * If a transport implementation is loaded as a kernel module, it can |
| 81 | * call this interface to make itself known to the RPC client. |
| 82 | * |
| 83 | * Returns: |
| 84 | * 0: transport successfully registered |
| 85 | * -EEXIST: transport already registered |
| 86 | * -EINVAL: transport module being unloaded |
| 87 | */ |
| 88 | int xprt_register_transport(struct xprt_class *transport) |
| 89 | { |
| 90 | struct xprt_class *t; |
| 91 | int result; |
| 92 | |
| 93 | result = -EEXIST; |
| 94 | spin_lock(&xprt_list_lock); |
| 95 | list_for_each_entry(t, &xprt_list, list) { |
| 96 | /* don't register the same transport class twice */ |
\"Talpey, Thomas\ | 4fa016e | 2007-09-10 13:47:57 -0400 | [diff] [blame] | 97 | if (t->ident == transport->ident) |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 98 | goto out; |
| 99 | } |
| 100 | |
Denis V. Lunev | c9f6cde | 2008-07-31 09:53:56 +0400 | [diff] [blame] | 101 | list_add_tail(&transport->list, &xprt_list); |
| 102 | printk(KERN_INFO "RPC: Registered %s transport module.\n", |
| 103 | transport->name); |
| 104 | result = 0; |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 105 | |
| 106 | out: |
| 107 | spin_unlock(&xprt_list_lock); |
| 108 | return result; |
| 109 | } |
| 110 | EXPORT_SYMBOL_GPL(xprt_register_transport); |
| 111 | |
| 112 | /** |
| 113 | * xprt_unregister_transport - unregister a transport implementation |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 114 | * @transport: transport to unregister |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 115 | * |
| 116 | * Returns: |
| 117 | * 0: transport successfully unregistered |
| 118 | * -ENOENT: transport never registered |
| 119 | */ |
| 120 | int xprt_unregister_transport(struct xprt_class *transport) |
| 121 | { |
| 122 | struct xprt_class *t; |
| 123 | int result; |
| 124 | |
| 125 | result = 0; |
| 126 | spin_lock(&xprt_list_lock); |
| 127 | list_for_each_entry(t, &xprt_list, list) { |
| 128 | if (t == transport) { |
| 129 | printk(KERN_INFO |
| 130 | "RPC: Unregistered %s transport module.\n", |
| 131 | transport->name); |
| 132 | list_del_init(&transport->list); |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 133 | goto out; |
| 134 | } |
| 135 | } |
| 136 | result = -ENOENT; |
| 137 | |
| 138 | out: |
| 139 | spin_unlock(&xprt_list_lock); |
| 140 | return result; |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); |
| 143 | |
| 144 | /** |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 145 | * xprt_load_transport - load a transport implementation |
| 146 | * @transport_name: transport to load |
| 147 | * |
| 148 | * Returns: |
| 149 | * 0: transport successfully loaded |
| 150 | * -ENOENT: transport module not available |
| 151 | */ |
| 152 | int xprt_load_transport(const char *transport_name) |
| 153 | { |
| 154 | struct xprt_class *t; |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 155 | int result; |
| 156 | |
| 157 | result = 0; |
| 158 | spin_lock(&xprt_list_lock); |
| 159 | list_for_each_entry(t, &xprt_list, list) { |
| 160 | if (strcmp(t->name, transport_name) == 0) { |
| 161 | spin_unlock(&xprt_list_lock); |
| 162 | goto out; |
| 163 | } |
| 164 | } |
| 165 | spin_unlock(&xprt_list_lock); |
Alex Riesen | ef7ffe8 | 2010-05-24 14:33:05 -0700 | [diff] [blame] | 166 | result = request_module("xprt%s", transport_name); |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 167 | out: |
| 168 | return result; |
| 169 | } |
| 170 | EXPORT_SYMBOL_GPL(xprt_load_transport); |
| 171 | |
| 172 | /** |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 173 | * xprt_reserve_xprt - serialize write access to transports |
| 174 | * @task: task that is requesting access to the transport |
Randy Dunlap | 177c27b | 2011-07-28 06:54:36 +0000 | [diff] [blame] | 175 | * @xprt: pointer to the target transport |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 176 | * |
| 177 | * This prevents mixing the payload of separate requests, and prevents |
| 178 | * transport connects from colliding with writes. No congestion control |
| 179 | * is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | */ |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 181 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 183 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 184 | int priority; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 185 | |
| 186 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
| 187 | if (task == xprt->snd_task) |
| 188 | return 1; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 189 | goto out_sleep; |
| 190 | } |
| 191 | xprt->snd_task = task; |
Trond Myklebust | 9255194 | 2013-09-27 11:28:40 -0400 | [diff] [blame] | 192 | if (req != NULL) |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 193 | req->rq_ntrans++; |
j223yang@asset.uwaterloo.ca | 4d4a76f | 2011-03-10 12:40:28 -0500 | [diff] [blame] | 194 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 195 | return 1; |
| 196 | |
| 197 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 198 | dprintk("RPC: %5u failed to lock transport %p\n", |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 199 | task->tk_pid, xprt); |
| 200 | task->tk_timeout = 0; |
| 201 | task->tk_status = -EAGAIN; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 202 | if (req == NULL) |
| 203 | priority = RPC_PRIORITY_LOW; |
| 204 | else if (!req->rq_ntrans) |
| 205 | priority = RPC_PRIORITY_NORMAL; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 206 | else |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 207 | priority = RPC_PRIORITY_HIGH; |
| 208 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 209 | return 0; |
| 210 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 211 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 212 | |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 213 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
| 214 | { |
| 215 | xprt->snd_task = NULL; |
Trond Myklebust | d19751e | 2012-09-11 17:21:25 -0400 | [diff] [blame] | 216 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 217 | smp_mb__before_atomic(); |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 218 | clear_bit(XPRT_LOCKED, &xprt->state); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 219 | smp_mb__after_atomic(); |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 220 | } else |
Trond Myklebust | c1384c9 | 2007-06-14 18:00:42 -0400 | [diff] [blame] | 221 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 222 | } |
| 223 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 224 | /* |
| 225 | * xprt_reserve_xprt_cong - serialize write access to transports |
| 226 | * @task: task that is requesting access to the transport |
| 227 | * |
| 228 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is |
| 229 | * integrated into the decision of whether a request is allowed to be |
| 230 | * woken up and given access to the transport. |
| 231 | */ |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 232 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 233 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 235 | int priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 237 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (task == xprt->snd_task) |
| 239 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | goto out_sleep; |
| 241 | } |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 242 | if (req == NULL) { |
| 243 | xprt->snd_task = task; |
| 244 | return 1; |
| 245 | } |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 246 | if (__xprt_get_cong(xprt, task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | xprt->snd_task = task; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 248 | req->rq_ntrans++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return 1; |
| 250 | } |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 251 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 253 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | task->tk_timeout = 0; |
| 255 | task->tk_status = -EAGAIN; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 256 | if (req == NULL) |
| 257 | priority = RPC_PRIORITY_LOW; |
| 258 | else if (!req->rq_ntrans) |
| 259 | priority = RPC_PRIORITY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | else |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 261 | priority = RPC_PRIORITY_HIGH; |
| 262 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | return 0; |
| 264 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 265 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 267 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | { |
| 269 | int retval; |
| 270 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 271 | spin_lock_bh(&xprt->transport_lock); |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 272 | retval = xprt->ops->reserve_xprt(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 273 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return retval; |
| 275 | } |
| 276 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 277 | static bool __xprt_lock_write_func(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 279 | struct rpc_xprt *xprt = data; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 280 | struct rpc_rqst *req; |
| 281 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 282 | req = task->tk_rqstp; |
| 283 | xprt->snd_task = task; |
Trond Myklebust | 9255194 | 2013-09-27 11:28:40 -0400 | [diff] [blame] | 284 | if (req) |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 285 | req->rq_ntrans++; |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 286 | return true; |
| 287 | } |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 288 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 289 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
| 290 | { |
| 291 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
| 292 | return; |
| 293 | |
| 294 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt)) |
| 295 | return; |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 296 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 297 | } |
| 298 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 299 | static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data) |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 300 | { |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 301 | struct rpc_xprt *xprt = data; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 302 | struct rpc_rqst *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 304 | req = task->tk_rqstp; |
| 305 | if (req == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | xprt->snd_task = task; |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 307 | return true; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 308 | } |
| 309 | if (__xprt_get_cong(xprt, task)) { |
| 310 | xprt->snd_task = task; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 311 | req->rq_ntrans++; |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 312 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 314 | return false; |
| 315 | } |
| 316 | |
| 317 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) |
| 318 | { |
| 319 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
| 320 | return; |
| 321 | if (RPCXPRT_CONGESTED(xprt)) |
| 322 | goto out_unlock; |
| 323 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt)) |
| 324 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | out_unlock: |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 326 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 329 | /** |
| 330 | * xprt_release_xprt - allow other requests to use a transport |
| 331 | * @xprt: transport with other tasks potentially waiting |
| 332 | * @task: task that is releasing access to the transport |
| 333 | * |
| 334 | * Note that "task" can be NULL. No congestion control is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | */ |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 336 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
| 338 | if (xprt->snd_task == task) { |
Trond Myklebust | ee071ef | 2013-09-27 11:09:53 -0400 | [diff] [blame] | 339 | if (task != NULL) { |
| 340 | struct rpc_rqst *req = task->tk_rqstp; |
| 341 | if (req != NULL) |
| 342 | req->rq_bytes_sent = 0; |
| 343 | } |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 344 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | __xprt_lock_write_next(xprt); |
| 346 | } |
| 347 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 348 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 350 | /** |
| 351 | * xprt_release_xprt_cong - allow other requests to use a transport |
| 352 | * @xprt: transport with other tasks potentially waiting |
| 353 | * @task: task that is releasing access to the transport |
| 354 | * |
| 355 | * Note that "task" can be NULL. Another task is awoken to use the |
| 356 | * transport if the transport's congestion window allows it. |
| 357 | */ |
| 358 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 359 | { |
| 360 | if (xprt->snd_task == task) { |
Trond Myklebust | ee071ef | 2013-09-27 11:09:53 -0400 | [diff] [blame] | 361 | if (task != NULL) { |
| 362 | struct rpc_rqst *req = task->tk_rqstp; |
| 363 | if (req != NULL) |
| 364 | req->rq_bytes_sent = 0; |
| 365 | } |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 366 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 367 | __xprt_lock_write_next_cong(xprt); |
| 368 | } |
| 369 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 370 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 371 | |
| 372 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 374 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 375 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 376 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * Van Jacobson congestion avoidance. Check if the congestion window |
| 381 | * overflowed. Put the task to sleep if this is the case. |
| 382 | */ |
| 383 | static int |
| 384 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 385 | { |
| 386 | struct rpc_rqst *req = task->tk_rqstp; |
| 387 | |
| 388 | if (req->rq_cong) |
| 389 | return 1; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 390 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | task->tk_pid, xprt->cong, xprt->cwnd); |
| 392 | if (RPCXPRT_CONGESTED(xprt)) |
| 393 | return 0; |
| 394 | req->rq_cong = 1; |
| 395 | xprt->cong += RPC_CWNDSCALE; |
| 396 | return 1; |
| 397 | } |
| 398 | |
| 399 | /* |
| 400 | * Adjust the congestion window, and wake up the next task |
| 401 | * that has been sleeping due to congestion |
| 402 | */ |
| 403 | static void |
| 404 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 405 | { |
| 406 | if (!req->rq_cong) |
| 407 | return; |
| 408 | req->rq_cong = 0; |
| 409 | xprt->cong -= RPC_CWNDSCALE; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 410 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 413 | /** |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 414 | * xprt_release_rqst_cong - housekeeping when request is complete |
| 415 | * @task: RPC request that recently completed |
| 416 | * |
| 417 | * Useful for transports that require congestion control. |
| 418 | */ |
| 419 | void xprt_release_rqst_cong(struct rpc_task *task) |
| 420 | { |
Trond Myklebust | a4f0835 | 2013-01-08 09:10:21 -0500 | [diff] [blame] | 421 | struct rpc_rqst *req = task->tk_rqstp; |
| 422 | |
| 423 | __xprt_put_cong(req->rq_xprt, req); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 424 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 425 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 426 | |
| 427 | /** |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 428 | * xprt_adjust_cwnd - adjust transport congestion window |
Trond Myklebust | 6a24dfb | 2013-01-08 09:48:15 -0500 | [diff] [blame] | 429 | * @xprt: pointer to xprt |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 430 | * @task: recently completed RPC request used to adjust window |
| 431 | * @result: result code of completed RPC request |
| 432 | * |
Chuck Lever | 4f4cf5a | 2014-05-28 10:34:49 -0400 | [diff] [blame] | 433 | * The transport code maintains an estimate on the maximum number of out- |
| 434 | * standing RPC requests, using a smoothed version of the congestion |
| 435 | * avoidance implemented in 44BSD. This is basically the Van Jacobson |
| 436 | * congestion algorithm: If a retransmit occurs, the congestion window is |
| 437 | * halved; otherwise, it is incremented by 1/cwnd when |
| 438 | * |
| 439 | * - a reply is received and |
| 440 | * - a full number of requests are outstanding and |
| 441 | * - the congestion window hasn't been updated recently. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | */ |
Trond Myklebust | 6a24dfb | 2013-01-08 09:48:15 -0500 | [diff] [blame] | 443 | void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 445 | struct rpc_rqst *req = task->tk_rqstp; |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 446 | unsigned long cwnd = xprt->cwnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | if (result >= 0 && cwnd <= xprt->cong) { |
| 449 | /* The (cwnd >> 1) term makes sure |
| 450 | * the result gets rounded properly. */ |
| 451 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
| 452 | if (cwnd > RPC_MAXCWND(xprt)) |
| 453 | cwnd = RPC_MAXCWND(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 454 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } else if (result == -ETIMEDOUT) { |
| 456 | cwnd >>= 1; |
| 457 | if (cwnd < RPC_CWNDSCALE) |
| 458 | cwnd = RPC_CWNDSCALE; |
| 459 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 460 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | xprt->cong, xprt->cwnd, cwnd); |
| 462 | xprt->cwnd = cwnd; |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 463 | __xprt_put_cong(xprt, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 465 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 467 | /** |
| 468 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
| 469 | * @xprt: transport with waiting tasks |
| 470 | * @status: result code to plant in each task before waking it |
| 471 | * |
| 472 | */ |
| 473 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
| 474 | { |
| 475 | if (status < 0) |
| 476 | rpc_wake_up_status(&xprt->pending, status); |
| 477 | else |
| 478 | rpc_wake_up(&xprt->pending); |
| 479 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 480 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 481 | |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 482 | /** |
| 483 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
| 484 | * @task: task to be put to sleep |
Randy Dunlap | 0b80ae4 | 2008-04-26 22:59:02 -0700 | [diff] [blame] | 485 | * @action: function pointer to be executed after wait |
Trond Myklebust | a9a6b52 | 2013-02-22 14:57:57 -0500 | [diff] [blame] | 486 | * |
| 487 | * Note that we only set the timer for the case of RPC_IS_SOFT(), since |
| 488 | * we don't in general want to force a socket disconnection due to |
| 489 | * an incomplete RPC call transmission. |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 490 | */ |
Trond Myklebust | b6ddf64 | 2008-04-17 18:52:19 -0400 | [diff] [blame] | 491 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 492 | { |
| 493 | struct rpc_rqst *req = task->tk_rqstp; |
| 494 | struct rpc_xprt *xprt = req->rq_xprt; |
| 495 | |
Trond Myklebust | a9a6b52 | 2013-02-22 14:57:57 -0500 | [diff] [blame] | 496 | task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0; |
Trond Myklebust | b6ddf64 | 2008-04-17 18:52:19 -0400 | [diff] [blame] | 497 | rpc_sleep_on(&xprt->pending, task, action); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 498 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 499 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 500 | |
| 501 | /** |
| 502 | * xprt_write_space - wake the task waiting for transport output buffer space |
| 503 | * @xprt: transport with waiting tasks |
| 504 | * |
| 505 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
| 506 | */ |
| 507 | void xprt_write_space(struct rpc_xprt *xprt) |
| 508 | { |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 509 | spin_lock_bh(&xprt->transport_lock); |
| 510 | if (xprt->snd_task) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 511 | dprintk("RPC: write space: waking waiting task on " |
| 512 | "xprt %p\n", xprt); |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 513 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 514 | } |
| 515 | spin_unlock_bh(&xprt->transport_lock); |
| 516 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 517 | EXPORT_SYMBOL_GPL(xprt_write_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 518 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 519 | /** |
| 520 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
| 521 | * @task: task whose timeout is to be set |
| 522 | * |
| 523 | * Set a request's retransmit timeout based on the transport's |
| 524 | * default timeout parameters. Used by transports that don't adjust |
| 525 | * the retransmit timeout based on round-trip time estimation. |
| 526 | */ |
| 527 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
| 528 | { |
| 529 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
| 530 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 531 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 532 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 533 | /** |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 534 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
| 535 | * @task: task whose timeout is to be set |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 536 | * |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 537 | * Set a request's retransmit timeout using the RTT estimator. |
| 538 | */ |
| 539 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
| 540 | { |
| 541 | int timer = task->tk_msg.rpc_proc->p_timer; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 542 | struct rpc_clnt *clnt = task->tk_client; |
| 543 | struct rpc_rtt *rtt = clnt->cl_rtt; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 544 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 545 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 546 | |
| 547 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
| 548 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
| 549 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
| 550 | task->tk_timeout = max_timeout; |
| 551 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 552 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
| 555 | { |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 556 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | req->rq_majortimeo = req->rq_timeout; |
| 559 | if (to->to_exponential) |
| 560 | req->rq_majortimeo <<= to->to_retries; |
| 561 | else |
| 562 | req->rq_majortimeo += to->to_increment * to->to_retries; |
| 563 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
| 564 | req->rq_majortimeo = to->to_maxval; |
| 565 | req->rq_majortimeo += jiffies; |
| 566 | } |
| 567 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 568 | /** |
| 569 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
| 570 | * @req: RPC request containing parameters to use for the adjustment |
| 571 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | */ |
| 573 | int xprt_adjust_timeout(struct rpc_rqst *req) |
| 574 | { |
| 575 | struct rpc_xprt *xprt = req->rq_xprt; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 576 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | int status = 0; |
| 578 | |
| 579 | if (time_before(jiffies, req->rq_majortimeo)) { |
| 580 | if (to->to_exponential) |
| 581 | req->rq_timeout <<= 1; |
| 582 | else |
| 583 | req->rq_timeout += to->to_increment; |
| 584 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
| 585 | req->rq_timeout = to->to_maxval; |
| 586 | req->rq_retries++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } else { |
| 588 | req->rq_timeout = to->to_initval; |
| 589 | req->rq_retries = 0; |
| 590 | xprt_reset_majortimeo(req); |
| 591 | /* Reset the RTT counters == "slow start" */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 592 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 594 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | status = -ETIMEDOUT; |
| 596 | } |
| 597 | |
| 598 | if (req->rq_timeout == 0) { |
| 599 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
| 600 | req->rq_timeout = 5 * HZ; |
| 601 | } |
| 602 | return status; |
| 603 | } |
| 604 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 605 | static void xprt_autoclose(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 607 | struct rpc_xprt *xprt = |
| 608 | container_of(work, struct rpc_xprt, task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 610 | xprt->ops->close(xprt); |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 611 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | xprt_release_write(xprt, NULL); |
| 613 | } |
| 614 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 615 | /** |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 616 | * xprt_disconnect_done - mark a transport as disconnected |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 617 | * @xprt: transport to flag for disconnect |
| 618 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | */ |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 620 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 622 | dprintk("RPC: disconnected transport %p\n", xprt); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 623 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | xprt_clear_connected(xprt); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 625 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 626 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 628 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 630 | /** |
| 631 | * xprt_force_disconnect - force a transport to disconnect |
| 632 | * @xprt: transport to disconnect |
| 633 | * |
| 634 | */ |
| 635 | void xprt_force_disconnect(struct rpc_xprt *xprt) |
| 636 | { |
| 637 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
| 638 | spin_lock_bh(&xprt->transport_lock); |
| 639 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 640 | /* Try to schedule an autoclose RPC call */ |
| 641 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
| 642 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 643 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 644 | spin_unlock_bh(&xprt->transport_lock); |
| 645 | } |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 646 | |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 647 | /** |
| 648 | * xprt_conditional_disconnect - force a transport to disconnect |
| 649 | * @xprt: transport to disconnect |
| 650 | * @cookie: 'connection cookie' |
| 651 | * |
| 652 | * This attempts to break the connection if and only if 'cookie' matches |
| 653 | * the current transport 'connection cookie'. It ensures that we don't |
| 654 | * try to break the connection more than once when we need to retransmit |
| 655 | * a batch of RPC requests. |
| 656 | * |
| 657 | */ |
| 658 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) |
| 659 | { |
| 660 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
| 661 | spin_lock_bh(&xprt->transport_lock); |
| 662 | if (cookie != xprt->connect_cookie) |
| 663 | goto out; |
| 664 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) |
| 665 | goto out; |
| 666 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 667 | /* Try to schedule an autoclose RPC call */ |
| 668 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
| 669 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 670 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 671 | out: |
| 672 | spin_unlock_bh(&xprt->transport_lock); |
| 673 | } |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | static void |
| 676 | xprt_init_autodisconnect(unsigned long data) |
| 677 | { |
| 678 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
| 679 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 680 | spin_lock(&xprt->transport_lock); |
Trond Myklebust | d19751e | 2012-09-11 17:21:25 -0400 | [diff] [blame] | 681 | if (!list_empty(&xprt->recv)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | goto out_abort; |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 683 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | goto out_abort; |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 685 | spin_unlock(&xprt->transport_lock); |
Trond Myklebust | f75e674 | 2009-04-21 17:18:20 -0400 | [diff] [blame] | 686 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
| 687 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | return; |
| 689 | out_abort: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 690 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
| 692 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 693 | /** |
| 694 | * xprt_connect - schedule a transport connect operation |
| 695 | * @task: RPC task that is requesting the connect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | * |
| 697 | */ |
| 698 | void xprt_connect(struct rpc_task *task) |
| 699 | { |
Trond Myklebust | ad2368d | 2013-01-08 10:08:33 -0500 | [diff] [blame] | 700 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 702 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
| 704 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 705 | if (!xprt_bound(xprt)) { |
Trond Myklebust | 01d37c4 | 2009-03-11 14:09:39 -0400 | [diff] [blame] | 706 | task->tk_status = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | return; |
| 708 | } |
| 709 | if (!xprt_lock_write(xprt, task)) |
| 710 | return; |
Trond Myklebust | feb8ca3 | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 711 | |
| 712 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) |
| 713 | xprt->ops->close(xprt); |
| 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if (xprt_connected(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 716 | xprt_release_write(xprt, task); |
| 717 | else { |
Dan Carpenter | 87e3c05 | 2012-02-01 10:46:20 +0300 | [diff] [blame] | 718 | task->tk_rqstp->rq_bytes_sent = 0; |
Trond Myklebust | a8ce4a8 | 2010-04-16 16:42:12 -0400 | [diff] [blame] | 719 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 720 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
Trond Myklebust | 0b9e794 | 2010-04-16 16:41:57 -0400 | [diff] [blame] | 721 | |
| 722 | if (test_bit(XPRT_CLOSING, &xprt->state)) |
| 723 | return; |
| 724 | if (xprt_test_and_set_connecting(xprt)) |
| 725 | return; |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 726 | xprt->stat.connect_start = jiffies; |
Trond Myklebust | 1b09209 | 2013-01-08 09:26:49 -0500 | [diff] [blame] | 727 | xprt->ops->connect(xprt, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 731 | static void xprt_connect_status(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
Trond Myklebust | ad2368d | 2013-01-08 10:08:33 -0500 | [diff] [blame] | 733 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Chuck Lever | cd983ef | 2008-06-11 17:56:13 -0400 | [diff] [blame] | 735 | if (task->tk_status == 0) { |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 736 | xprt->stat.connect_count++; |
| 737 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 738 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | task->tk_pid); |
| 740 | return; |
| 741 | } |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | switch (task->tk_status) { |
Trond Myklebust | 0fe8d04 | 2013-12-31 13:13:30 -0500 | [diff] [blame] | 744 | case -ECONNREFUSED: |
| 745 | case -ECONNRESET: |
| 746 | case -ECONNABORTED: |
| 747 | case -ENETUNREACH: |
| 748 | case -EHOSTUNREACH: |
Trond Myklebust | 2fc193c | 2014-07-03 00:02:57 -0400 | [diff] [blame] | 749 | case -EPIPE: |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 750 | case -EAGAIN: |
| 751 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 752 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 754 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
| 755 | "out\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | break; |
| 757 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 758 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
| 759 | "server %s\n", task->tk_pid, -task->tk_status, |
Trond Myklebust | 4e0038b | 2012-03-01 17:01:05 -0500 | [diff] [blame] | 760 | xprt->servername); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 761 | xprt_release_write(xprt, task); |
| 762 | task->tk_status = -EIO; |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 766 | /** |
| 767 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
| 768 | * @xprt: transport on which the original request was transmitted |
| 769 | * @xid: RPC XID of incoming reply |
| 770 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 772 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 774 | struct rpc_rqst *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 776 | list_for_each_entry(entry, &xprt->recv, rq_list) |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 777 | if (entry->rq_xid == xid) { |
| 778 | trace_xprt_lookup_rqst(xprt, xid, 0); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 779 | return entry; |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 780 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 781 | |
| 782 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", |
| 783 | ntohl(xid)); |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 784 | trace_xprt_lookup_rqst(xprt, xid, -ENOENT); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 785 | xprt->stat.bad_xids++; |
| 786 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 788 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Chuck Lever | bbc72ce | 2010-05-07 13:34:27 -0400 | [diff] [blame] | 790 | static void xprt_update_rtt(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | { |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 792 | struct rpc_rqst *req = task->tk_rqstp; |
| 793 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 794 | unsigned int timer = task->tk_msg.rpc_proc->p_timer; |
Trond Myklebust | d60dbb2 | 2010-05-13 12:51:49 -0400 | [diff] [blame] | 795 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 797 | if (timer) { |
| 798 | if (req->rq_ntrans == 1) |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 799 | rpc_update_rtt(rtt, timer, m); |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 800 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 804 | /** |
| 805 | * xprt_complete_rqst - called when reply processing is complete |
| 806 | * @task: RPC request that recently completed |
| 807 | * @copied: actual number of bytes received from the transport |
| 808 | * |
| 809 | * Caller holds transport lock. |
| 810 | */ |
| 811 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
| 812 | { |
| 813 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 814 | struct rpc_xprt *xprt = req->rq_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 816 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
| 817 | task->tk_pid, ntohl(req->rq_xid), copied); |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 818 | trace_xprt_complete_rqst(xprt, req->rq_xid, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 820 | xprt->stat.recvs++; |
Trond Myklebust | d60dbb2 | 2010-05-13 12:51:49 -0400 | [diff] [blame] | 821 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
Chuck Lever | bbc72ce | 2010-05-07 13:34:27 -0400 | [diff] [blame] | 822 | if (xprt->ops->timer != NULL) |
| 823 | xprt_update_rtt(task); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | list_del_init(&req->rq_list); |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 826 | req->rq_private_buf.len = copied; |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 827 | /* Ensure all writes are done before we update */ |
| 828 | /* req->rq_reply_bytes_recvd */ |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 829 | smp_wmb(); |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 830 | req->rq_reply_bytes_recvd = copied; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 831 | rpc_wake_up_queued_task(&xprt->pending, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 833 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 835 | static void xprt_timer(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 837 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | struct rpc_xprt *xprt = req->rq_xprt; |
| 839 | |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 840 | if (task->tk_status != -ETIMEDOUT) |
| 841 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 842 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 843 | |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 844 | spin_lock_bh(&xprt->transport_lock); |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 845 | if (!req->rq_reply_bytes_recvd) { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 846 | if (xprt->ops->timer) |
Trond Myklebust | 6a24dfb | 2013-01-08 09:48:15 -0500 | [diff] [blame] | 847 | xprt->ops->timer(xprt, task); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 848 | } else |
| 849 | task->tk_status = 0; |
| 850 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
| 852 | |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 853 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
| 854 | { |
| 855 | return xprt->idle_timeout != 0; |
| 856 | } |
| 857 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 858 | /** |
| 859 | * xprt_prepare_transmit - reserve the transport before sending a request |
| 860 | * @task: RPC task about to send a request |
| 861 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | */ |
Trond Myklebust | 90051ea | 2013-09-25 12:17:18 -0400 | [diff] [blame] | 863 | bool xprt_prepare_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | { |
| 865 | struct rpc_rqst *req = task->tk_rqstp; |
| 866 | struct rpc_xprt *xprt = req->rq_xprt; |
Trond Myklebust | 90051ea | 2013-09-25 12:17:18 -0400 | [diff] [blame] | 867 | bool ret = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 869 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 871 | spin_lock_bh(&xprt->transport_lock); |
Trond Myklebust | 8a19a0b | 2013-09-24 12:00:27 -0400 | [diff] [blame] | 872 | if (!req->rq_bytes_sent) { |
| 873 | if (req->rq_reply_bytes_recvd) { |
| 874 | task->tk_status = req->rq_reply_bytes_recvd; |
| 875 | goto out_unlock; |
| 876 | } |
| 877 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) |
| 878 | && xprt_connected(xprt) |
| 879 | && req->rq_connect_cookie == xprt->connect_cookie) { |
| 880 | xprt->ops->set_retrans_timeout(task); |
| 881 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
| 882 | goto out_unlock; |
| 883 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
Trond Myklebust | 90051ea | 2013-09-25 12:17:18 -0400 | [diff] [blame] | 885 | if (!xprt->ops->reserve_xprt(xprt, task)) { |
| 886 | task->tk_status = -EAGAIN; |
| 887 | goto out_unlock; |
| 888 | } |
| 889 | ret = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | out_unlock: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 891 | spin_unlock_bh(&xprt->transport_lock); |
Trond Myklebust | 90051ea | 2013-09-25 12:17:18 -0400 | [diff] [blame] | 892 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | } |
| 894 | |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 895 | void xprt_end_transmit(struct rpc_task *task) |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 896 | { |
Rahul Iyer | 343952f | 2009-04-01 09:23:17 -0400 | [diff] [blame] | 897 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 898 | } |
| 899 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 900 | /** |
| 901 | * xprt_transmit - send an RPC request on a transport |
| 902 | * @task: controlling RPC task |
| 903 | * |
| 904 | * We have to copy the iovec because sendmsg fiddles with its contents. |
| 905 | */ |
| 906 | void xprt_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | struct rpc_rqst *req = task->tk_rqstp; |
| 909 | struct rpc_xprt *xprt = req->rq_xprt; |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 910 | int status, numreqs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 912 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 914 | if (!req->rq_reply_bytes_recvd) { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 915 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
| 916 | /* |
| 917 | * Add to the list only if we're expecting a reply |
| 918 | */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 919 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | /* Update the softirq receive buffer */ |
| 921 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
| 922 | sizeof(req->rq_private_buf)); |
| 923 | /* Add request to the receive list */ |
| 924 | list_add_tail(&req->rq_list, &xprt->recv); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 925 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | xprt_reset_majortimeo(req); |
Trond Myklebust | 0f9dc2b | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 927 | /* Turn off autodisconnect */ |
| 928 | del_singleshot_timer_sync(&xprt->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
| 930 | } else if (!req->rq_bytes_sent) |
| 931 | return; |
| 932 | |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 933 | req->rq_xtime = ktime_get(); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 934 | status = xprt->ops->send_request(task); |
Jeff Layton | 3705ad6 | 2014-10-28 14:24:13 -0400 | [diff] [blame] | 935 | trace_xprt_transmit(xprt, req->rq_xid, status); |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 936 | if (status != 0) { |
| 937 | task->tk_status = status; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 938 | return; |
| 939 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 941 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
Bryan Schumaker | 468f861 | 2011-04-18 15:57:32 -0400 | [diff] [blame] | 942 | task->tk_flags |= RPC_TASK_SENT; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 943 | spin_lock_bh(&xprt->transport_lock); |
| 944 | |
| 945 | xprt->ops->set_retrans_timeout(task); |
| 946 | |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 947 | numreqs = atomic_read(&xprt->num_reqs); |
| 948 | if (numreqs > xprt->stat.max_slots) |
| 949 | xprt->stat.max_slots = numreqs; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 950 | xprt->stat.sends++; |
| 951 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; |
| 952 | xprt->stat.bklog_u += xprt->backlog.qlen; |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 953 | xprt->stat.sending_u += xprt->sending.qlen; |
| 954 | xprt->stat.pending_u += xprt->pending.qlen; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 955 | |
| 956 | /* Don't race with disconnect */ |
| 957 | if (!xprt_connected(xprt)) |
| 958 | task->tk_status = -ENOTCONN; |
Trond Myklebust | 0a66052 | 2013-09-25 11:31:54 -0400 | [diff] [blame] | 959 | else { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 960 | /* |
| 961 | * Sleep on the pending queue since |
| 962 | * we're expecting a reply. |
| 963 | */ |
Trond Myklebust | 0a66052 | 2013-09-25 11:31:54 -0400 | [diff] [blame] | 964 | if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) |
| 965 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
| 966 | req->rq_connect_cookie = xprt->connect_cookie; |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 967 | } |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 968 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
| 970 | |
Trond Myklebust | ba60eb2 | 2013-04-14 10:49:37 -0400 | [diff] [blame] | 971 | static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task) |
| 972 | { |
| 973 | set_bit(XPRT_CONGESTED, &xprt->state); |
| 974 | rpc_sleep_on(&xprt->backlog, task, NULL); |
| 975 | } |
| 976 | |
| 977 | static void xprt_wake_up_backlog(struct rpc_xprt *xprt) |
| 978 | { |
| 979 | if (rpc_wake_up_next(&xprt->backlog) == NULL) |
| 980 | clear_bit(XPRT_CONGESTED, &xprt->state); |
| 981 | } |
| 982 | |
| 983 | static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task) |
| 984 | { |
| 985 | bool ret = false; |
| 986 | |
| 987 | if (!test_bit(XPRT_CONGESTED, &xprt->state)) |
| 988 | goto out; |
| 989 | spin_lock(&xprt->reserve_lock); |
| 990 | if (test_bit(XPRT_CONGESTED, &xprt->state)) { |
| 991 | rpc_sleep_on(&xprt->backlog, task, NULL); |
| 992 | ret = true; |
| 993 | } |
| 994 | spin_unlock(&xprt->reserve_lock); |
| 995 | out: |
| 996 | return ret; |
| 997 | } |
| 998 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 999 | static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags) |
| 1000 | { |
| 1001 | struct rpc_rqst *req = ERR_PTR(-EAGAIN); |
| 1002 | |
| 1003 | if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) |
| 1004 | goto out; |
| 1005 | req = kzalloc(sizeof(struct rpc_rqst), gfp_flags); |
| 1006 | if (req != NULL) |
| 1007 | goto out; |
| 1008 | atomic_dec(&xprt->num_reqs); |
| 1009 | req = ERR_PTR(-ENOMEM); |
| 1010 | out: |
| 1011 | return req; |
| 1012 | } |
| 1013 | |
| 1014 | static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 1015 | { |
| 1016 | if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { |
| 1017 | kfree(req); |
| 1018 | return true; |
| 1019 | } |
| 1020 | return false; |
| 1021 | } |
| 1022 | |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1023 | void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | { |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1025 | struct rpc_rqst *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1027 | spin_lock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | if (!list_empty(&xprt->free)) { |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1029 | req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
| 1030 | list_del(&req->rq_list); |
| 1031 | goto out_init_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |
Jeff Layton | 6b34309 | 2012-05-16 13:30:35 -0400 | [diff] [blame] | 1033 | req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN); |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1034 | if (!IS_ERR(req)) |
| 1035 | goto out_init_req; |
| 1036 | switch (PTR_ERR(req)) { |
| 1037 | case -ENOMEM: |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1038 | dprintk("RPC: dynamic allocation of request slot " |
| 1039 | "failed! Retrying\n"); |
Trond Myklebust | 1afeaf5 | 2012-05-19 12:12:53 -0400 | [diff] [blame] | 1040 | task->tk_status = -ENOMEM; |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1041 | break; |
| 1042 | case -EAGAIN: |
Trond Myklebust | ba60eb2 | 2013-04-14 10:49:37 -0400 | [diff] [blame] | 1043 | xprt_add_backlog(xprt, task); |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1044 | dprintk("RPC: waiting for request slot\n"); |
Trond Myklebust | 1afeaf5 | 2012-05-19 12:12:53 -0400 | [diff] [blame] | 1045 | default: |
| 1046 | task->tk_status = -EAGAIN; |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1047 | } |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1048 | spin_unlock(&xprt->reserve_lock); |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1049 | return; |
| 1050 | out_init_req: |
| 1051 | task->tk_status = 0; |
| 1052 | task->tk_rqstp = req; |
| 1053 | xprt_request_init(task, xprt); |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1054 | spin_unlock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | } |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1056 | EXPORT_SYMBOL_GPL(xprt_alloc_slot); |
| 1057 | |
| 1058 | void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
| 1059 | { |
| 1060 | /* Note: grabbing the xprt_lock_write() ensures that we throttle |
| 1061 | * new slot allocation if the transport is congested (i.e. when |
| 1062 | * reconnecting a stream transport or when out of socket write |
| 1063 | * buffer space). |
| 1064 | */ |
| 1065 | if (xprt_lock_write(xprt, task)) { |
| 1066 | xprt_alloc_slot(xprt, task); |
| 1067 | xprt_release_write(xprt, task); |
| 1068 | } |
| 1069 | } |
| 1070 | EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1072 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 1073 | { |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1074 | spin_lock(&xprt->reserve_lock); |
Trond Myklebust | c25573b | 2011-12-01 14:16:17 -0500 | [diff] [blame] | 1075 | if (!xprt_dynamic_free_slot(xprt, req)) { |
| 1076 | memset(req, 0, sizeof(*req)); /* mark unused */ |
| 1077 | list_add(&req->rq_list, &xprt->free); |
| 1078 | } |
Trond Myklebust | ba60eb2 | 2013-04-14 10:49:37 -0400 | [diff] [blame] | 1079 | xprt_wake_up_backlog(xprt); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1080 | spin_unlock(&xprt->reserve_lock); |
| 1081 | } |
| 1082 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1083 | static void xprt_free_all_slots(struct rpc_xprt *xprt) |
| 1084 | { |
| 1085 | struct rpc_rqst *req; |
| 1086 | while (!list_empty(&xprt->free)) { |
| 1087 | req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); |
| 1088 | list_del(&req->rq_list); |
| 1089 | kfree(req); |
| 1090 | } |
| 1091 | } |
| 1092 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1093 | struct rpc_xprt *xprt_alloc(struct net *net, size_t size, |
| 1094 | unsigned int num_prealloc, |
| 1095 | unsigned int max_alloc) |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1096 | { |
| 1097 | struct rpc_xprt *xprt; |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1098 | struct rpc_rqst *req; |
| 1099 | int i; |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1100 | |
| 1101 | xprt = kzalloc(size, GFP_KERNEL); |
| 1102 | if (xprt == NULL) |
| 1103 | goto out; |
| 1104 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1105 | xprt_init(xprt, net); |
| 1106 | |
| 1107 | for (i = 0; i < num_prealloc; i++) { |
| 1108 | req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); |
| 1109 | if (!req) |
wangweidong | 8313164 | 2013-10-15 11:44:30 +0800 | [diff] [blame] | 1110 | goto out_free; |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1111 | list_add(&req->rq_list, &xprt->free); |
| 1112 | } |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1113 | if (max_alloc > num_prealloc) |
| 1114 | xprt->max_reqs = max_alloc; |
| 1115 | else |
| 1116 | xprt->max_reqs = num_prealloc; |
| 1117 | xprt->min_reqs = num_prealloc; |
| 1118 | atomic_set(&xprt->num_reqs, num_prealloc); |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1119 | |
| 1120 | return xprt; |
| 1121 | |
| 1122 | out_free: |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1123 | xprt_free(xprt); |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1124 | out: |
| 1125 | return NULL; |
| 1126 | } |
| 1127 | EXPORT_SYMBOL_GPL(xprt_alloc); |
| 1128 | |
Pavel Emelyanov | e204e62 | 2010-09-29 16:03:13 +0400 | [diff] [blame] | 1129 | void xprt_free(struct rpc_xprt *xprt) |
| 1130 | { |
Pavel Emelyanov | 37aa213 | 2010-09-29 16:05:43 +0400 | [diff] [blame] | 1131 | put_net(xprt->xprt_net); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1132 | xprt_free_all_slots(xprt); |
Pavel Emelyanov | e204e62 | 2010-09-29 16:03:13 +0400 | [diff] [blame] | 1133 | kfree(xprt); |
| 1134 | } |
| 1135 | EXPORT_SYMBOL_GPL(xprt_free); |
| 1136 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1137 | /** |
| 1138 | * xprt_reserve - allocate an RPC request slot |
| 1139 | * @task: RPC task requesting a slot allocation |
| 1140 | * |
Trond Myklebust | ba60eb2 | 2013-04-14 10:49:37 -0400 | [diff] [blame] | 1141 | * If the transport is marked as being congested, or if no more |
| 1142 | * slots are available, place the task on the transport's |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1143 | * backlog queue. |
| 1144 | */ |
| 1145 | void xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | { |
Trond Myklebust | 45bc0dc | 2013-01-08 10:03:22 -0500 | [diff] [blame] | 1147 | struct rpc_xprt *xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 1149 | task->tk_status = 0; |
| 1150 | if (task->tk_rqstp != NULL) |
| 1151 | return; |
| 1152 | |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 1153 | task->tk_timeout = 0; |
| 1154 | task->tk_status = -EAGAIN; |
Trond Myklebust | 45bc0dc | 2013-01-08 10:03:22 -0500 | [diff] [blame] | 1155 | rcu_read_lock(); |
| 1156 | xprt = rcu_dereference(task->tk_client->cl_xprt); |
Trond Myklebust | ba60eb2 | 2013-04-14 10:49:37 -0400 | [diff] [blame] | 1157 | if (!xprt_throttle_congested(xprt, task)) |
| 1158 | xprt->ops->alloc_slot(xprt, task); |
| 1159 | rcu_read_unlock(); |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * xprt_retry_reserve - allocate an RPC request slot |
| 1164 | * @task: RPC task requesting a slot allocation |
| 1165 | * |
| 1166 | * If no more slots are available, place the task on the transport's |
| 1167 | * backlog queue. |
| 1168 | * Note that the only difference with xprt_reserve is that we now |
| 1169 | * ignore the value of the XPRT_CONGESTED flag. |
| 1170 | */ |
| 1171 | void xprt_retry_reserve(struct rpc_task *task) |
| 1172 | { |
| 1173 | struct rpc_xprt *xprt; |
| 1174 | |
| 1175 | task->tk_status = 0; |
| 1176 | if (task->tk_rqstp != NULL) |
| 1177 | return; |
| 1178 | |
| 1179 | task->tk_timeout = 0; |
| 1180 | task->tk_status = -EAGAIN; |
| 1181 | rcu_read_lock(); |
| 1182 | xprt = rcu_dereference(task->tk_client->cl_xprt); |
Trond Myklebust | f39c1bf | 2012-09-07 11:08:50 -0400 | [diff] [blame] | 1183 | xprt->ops->alloc_slot(xprt, task); |
Trond Myklebust | 45bc0dc | 2013-01-08 10:03:22 -0500 | [diff] [blame] | 1184 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | } |
| 1186 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1187 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1189 | return (__force __be32)xprt->xid++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
| 1193 | { |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 1194 | xprt->xid = prandom_u32(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | } |
| 1196 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1197 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | struct rpc_rqst *req = task->tk_rqstp; |
| 1200 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1201 | INIT_LIST_HEAD(&req->rq_list); |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 1202 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | req->rq_task = task; |
| 1204 | req->rq_xprt = xprt; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 1205 | req->rq_buffer = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | req->rq_xid = xprt_alloc_xid(xprt); |
Trond Myklebust | 0a66052 | 2013-09-25 11:31:54 -0400 | [diff] [blame] | 1207 | req->rq_connect_cookie = xprt->connect_cookie - 1; |
Trond Myklebust | 9255194 | 2013-09-27 11:28:40 -0400 | [diff] [blame] | 1208 | req->rq_bytes_sent = 0; |
| 1209 | req->rq_snd_buf.len = 0; |
| 1210 | req->rq_snd_buf.buflen = 0; |
| 1211 | req->rq_rcv_buf.len = 0; |
| 1212 | req->rq_rcv_buf.buflen = 0; |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 1213 | req->rq_release_snd_buf = NULL; |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1214 | xprt_reset_majortimeo(req); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1215 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | req, ntohl(req->rq_xid)); |
| 1217 | } |
| 1218 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1219 | /** |
| 1220 | * xprt_release - release an RPC request slot |
| 1221 | * @task: task which is finished with the slot |
| 1222 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1224 | void xprt_release(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1226 | struct rpc_xprt *xprt; |
Trond Myklebust | 87ed500 | 2013-01-07 14:30:46 -0500 | [diff] [blame] | 1227 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
Trond Myklebust | 87ed500 | 2013-01-07 14:30:46 -0500 | [diff] [blame] | 1229 | if (req == NULL) { |
| 1230 | if (task->tk_client) { |
| 1231 | rcu_read_lock(); |
| 1232 | xprt = rcu_dereference(task->tk_client->cl_xprt); |
| 1233 | if (xprt->snd_task == task) |
| 1234 | xprt_release_write(xprt, task); |
| 1235 | rcu_read_unlock(); |
| 1236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | return; |
Trond Myklebust | 87ed500 | 2013-01-07 14:30:46 -0500 | [diff] [blame] | 1238 | } |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1239 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1240 | xprt = req->rq_xprt; |
Weston Andros Adamson | 0a70219 | 2012-02-17 13:15:24 -0500 | [diff] [blame] | 1241 | if (task->tk_ops->rpc_count_stats != NULL) |
| 1242 | task->tk_ops->rpc_count_stats(task, task->tk_calldata); |
| 1243 | else if (task->tk_client) |
| 1244 | rpc_count_iostats(task, task->tk_client->cl_metrics); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 1245 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 1246 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 1247 | if (xprt->ops->release_request) |
| 1248 | xprt->ops->release_request(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | if (!list_empty(&req->rq_list)) |
| 1250 | list_del(&req->rq_list); |
| 1251 | xprt->last_used = jiffies; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1252 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 1253 | mod_timer(&xprt->timer, |
Chuck Lever | 03bf4b7 | 2005-08-25 16:25:55 -0700 | [diff] [blame] | 1254 | xprt->last_used + xprt->idle_timeout); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 1255 | spin_unlock_bh(&xprt->transport_lock); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1256 | if (req->rq_buffer) |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1257 | xprt->ops->buf_free(req->rq_buffer); |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1258 | if (req->rq_cred != NULL) |
| 1259 | put_rpccred(req->rq_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | task->tk_rqstp = NULL; |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 1261 | if (req->rq_release_snd_buf) |
| 1262 | req->rq_release_snd_buf(req); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1263 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1264 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1265 | if (likely(!bc_prealloc(req))) |
| 1266 | xprt_free_slot(xprt, req); |
| 1267 | else |
Trond Myklebust | c9acb42 | 2010-03-19 15:36:22 -0400 | [diff] [blame] | 1268 | xprt_free_bc_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | } |
| 1270 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1271 | static void xprt_init(struct rpc_xprt *xprt, struct net *net) |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1272 | { |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1273 | atomic_set(&xprt->count, 1); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1274 | |
| 1275 | spin_lock_init(&xprt->transport_lock); |
| 1276 | spin_lock_init(&xprt->reserve_lock); |
| 1277 | |
| 1278 | INIT_LIST_HEAD(&xprt->free); |
| 1279 | INIT_LIST_HEAD(&xprt->recv); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1280 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Ricardo Labiaga | f9acac1 | 2009-04-01 09:22:59 -0400 | [diff] [blame] | 1281 | spin_lock_init(&xprt->bc_pa_lock); |
| 1282 | INIT_LIST_HEAD(&xprt->bc_pa_list); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1283 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
Ricardo Labiaga | f9acac1 | 2009-04-01 09:22:59 -0400 | [diff] [blame] | 1284 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1285 | xprt->last_used = jiffies; |
| 1286 | xprt->cwnd = RPC_INITCWND; |
Chuck Lever | a509050 | 2007-03-29 16:48:04 -0400 | [diff] [blame] | 1287 | xprt->bind_index = 0; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1288 | |
| 1289 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); |
| 1290 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 1291 | rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1292 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
| 1293 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1294 | xprt_init_xid(xprt); |
| 1295 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1296 | xprt->xprt_net = get_net(net); |
Trond Myklebust | 8d9266f | 2011-07-17 16:01:09 -0400 | [diff] [blame] | 1297 | } |
| 1298 | |
| 1299 | /** |
| 1300 | * xprt_create_transport - create an RPC transport |
| 1301 | * @args: rpc transport creation arguments |
| 1302 | * |
| 1303 | */ |
| 1304 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) |
| 1305 | { |
| 1306 | struct rpc_xprt *xprt; |
| 1307 | struct xprt_class *t; |
| 1308 | |
| 1309 | spin_lock(&xprt_list_lock); |
| 1310 | list_for_each_entry(t, &xprt_list, list) { |
| 1311 | if (t->ident == args->ident) { |
| 1312 | spin_unlock(&xprt_list_lock); |
| 1313 | goto found; |
| 1314 | } |
| 1315 | } |
| 1316 | spin_unlock(&xprt_list_lock); |
Chuck Lever | 3c45ddf | 2014-07-16 15:38:32 -0400 | [diff] [blame] | 1317 | dprintk("RPC: transport (%d) not supported\n", args->ident); |
Trond Myklebust | 8d9266f | 2011-07-17 16:01:09 -0400 | [diff] [blame] | 1318 | return ERR_PTR(-EIO); |
| 1319 | |
| 1320 | found: |
| 1321 | xprt = t->setup(args); |
| 1322 | if (IS_ERR(xprt)) { |
| 1323 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
| 1324 | -PTR_ERR(xprt)); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1325 | goto out; |
Trond Myklebust | 8d9266f | 2011-07-17 16:01:09 -0400 | [diff] [blame] | 1326 | } |
J. Bruce Fields | 33d90ac | 2013-04-11 15:06:36 -0400 | [diff] [blame] | 1327 | if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) |
| 1328 | xprt->idle_timeout = 0; |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1329 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
| 1330 | if (xprt_has_timer(xprt)) |
| 1331 | setup_timer(&xprt->timer, xprt_init_autodisconnect, |
| 1332 | (unsigned long)xprt); |
| 1333 | else |
| 1334 | init_timer(&xprt->timer); |
Trond Myklebust | 4e0038b | 2012-03-01 17:01:05 -0500 | [diff] [blame] | 1335 | |
| 1336 | if (strlen(args->servername) > RPC_MAXNETNAMELEN) { |
| 1337 | xprt_destroy(xprt); |
| 1338 | return ERR_PTR(-EINVAL); |
| 1339 | } |
| 1340 | xprt->servername = kstrdup(args->servername, GFP_KERNEL); |
| 1341 | if (xprt->servername == NULL) { |
| 1342 | xprt_destroy(xprt); |
| 1343 | return ERR_PTR(-ENOMEM); |
| 1344 | } |
| 1345 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1346 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1347 | xprt->max_reqs); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1348 | out: |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1349 | return xprt; |
| 1350 | } |
| 1351 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1352 | /** |
| 1353 | * xprt_destroy - destroy an RPC transport, killing off all requests. |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1354 | * @xprt: transport to destroy |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1355 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | */ |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1357 | static void xprt_destroy(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1359 | dprintk("RPC: destroying transport %p\n", xprt); |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 1360 | del_timer_sync(&xprt->timer); |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1361 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1362 | rpc_destroy_wait_queue(&xprt->binding); |
| 1363 | rpc_destroy_wait_queue(&xprt->pending); |
| 1364 | rpc_destroy_wait_queue(&xprt->sending); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1365 | rpc_destroy_wait_queue(&xprt->backlog); |
J. Bruce Fields | c3ae62ae | 2010-08-03 17:22:20 -0400 | [diff] [blame] | 1366 | cancel_work_sync(&xprt->task_cleanup); |
Trond Myklebust | 4e0038b | 2012-03-01 17:01:05 -0500 | [diff] [blame] | 1367 | kfree(xprt->servername); |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1368 | /* |
| 1369 | * Tear down transport state and free the rpc_xprt |
| 1370 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 1371 | xprt->ops->destroy(xprt); |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1374 | /** |
| 1375 | * xprt_put - release a reference to an RPC transport. |
| 1376 | * @xprt: pointer to the transport |
| 1377 | * |
| 1378 | */ |
| 1379 | void xprt_put(struct rpc_xprt *xprt) |
| 1380 | { |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1381 | if (atomic_dec_and_test(&xprt->count)) |
| 1382 | xprt_destroy(xprt); |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1383 | } |