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 |
| 15 | * transport's wait list. At the same time, it installs a timer that |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * is run after the packet's timeout has expired. |
| 17 | * - When a packet arrives, the data_ready handler walks the list of |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 18 | * pending requests for that transport. If a matching XID is found, the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * caller is woken up, and the timer removed. |
| 20 | * - When no reply arrives within the timeout interval, the timer is |
| 21 | * fired by the kernel and runs xprt_timer(). It either adjusts the |
| 22 | * timeout values (minor timeout) or wakes up the caller with a status |
| 23 | * of -ETIMEDOUT. |
| 24 | * - When the caller receives a notification from RPC that a reply arrived, |
| 25 | * it should release the RPC slot, and process the reply. |
| 26 | * If the call timed out, it may choose to retry the operation by |
| 27 | * adjusting the initial timeout value, and simply calling rpc_call |
| 28 | * again. |
| 29 | * |
| 30 | * Support for async RPC is done through a set of RPC-specific scheduling |
| 31 | * primitives that `transparently' work for processes as well as async |
| 32 | * tasks that rely on callbacks. |
| 33 | * |
| 34 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 35 | * |
| 36 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | */ |
| 38 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 39 | #include <linux/module.h> |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/types.h> |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 42 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/workqueue.h> |
Chuck Lever | bf3fcf8 | 2006-05-25 01:40:51 -0400 | [diff] [blame] | 44 | #include <linux/net.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 46 | #include <linux/sunrpc/clnt.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 47 | #include <linux/sunrpc/metrics.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | /* |
| 50 | * Local variables |
| 51 | */ |
| 52 | |
| 53 | #ifdef RPC_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | # define RPCDBG_FACILITY RPCDBG_XPRT |
| 55 | #endif |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* |
| 58 | * Local functions |
| 59 | */ |
| 60 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
| 61 | static inline void do_xprt_reserve(struct rpc_task *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static void xprt_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
| 64 | |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame^] | 65 | static spinlock_t xprt_list_lock = SPIN_LOCK_UNLOCKED; |
| 66 | static LIST_HEAD(xprt_list); |
| 67 | |
Chuck Lever | 555ee3a | 2005-08-25 16:25:54 -0700 | [diff] [blame] | 68 | /* |
| 69 | * The transport code maintains an estimate on the maximum number of out- |
| 70 | * standing RPC requests, using a smoothed version of the congestion |
| 71 | * avoidance implemented in 44BSD. This is basically the Van Jacobson |
| 72 | * congestion algorithm: If a retransmit occurs, the congestion window is |
| 73 | * halved; otherwise, it is incremented by 1/cwnd when |
| 74 | * |
| 75 | * - a reply is received and |
| 76 | * - a full number of requests are outstanding and |
| 77 | * - the congestion window hasn't been updated recently. |
| 78 | */ |
| 79 | #define RPC_CWNDSHIFT (8U) |
| 80 | #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) |
| 81 | #define RPC_INITCWND RPC_CWNDSCALE |
| 82 | #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) |
| 83 | |
| 84 | #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 86 | /** |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame^] | 87 | * xprt_register_transport - register a transport implementation |
| 88 | * @transport: transport to register |
| 89 | * |
| 90 | * If a transport implementation is loaded as a kernel module, it can |
| 91 | * call this interface to make itself known to the RPC client. |
| 92 | * |
| 93 | * Returns: |
| 94 | * 0: transport successfully registered |
| 95 | * -EEXIST: transport already registered |
| 96 | * -EINVAL: transport module being unloaded |
| 97 | */ |
| 98 | int xprt_register_transport(struct xprt_class *transport) |
| 99 | { |
| 100 | struct xprt_class *t; |
| 101 | int result; |
| 102 | |
| 103 | result = -EEXIST; |
| 104 | spin_lock(&xprt_list_lock); |
| 105 | list_for_each_entry(t, &xprt_list, list) { |
| 106 | /* don't register the same transport class twice */ |
| 107 | if (t == transport) |
| 108 | goto out; |
| 109 | } |
| 110 | |
| 111 | result = -EINVAL; |
| 112 | if (try_module_get(THIS_MODULE)) { |
| 113 | list_add_tail(&transport->list, &xprt_list); |
| 114 | printk(KERN_INFO "RPC: Registered %s transport module.\n", |
| 115 | transport->name); |
| 116 | result = 0; |
| 117 | } |
| 118 | |
| 119 | out: |
| 120 | spin_unlock(&xprt_list_lock); |
| 121 | return result; |
| 122 | } |
| 123 | EXPORT_SYMBOL_GPL(xprt_register_transport); |
| 124 | |
| 125 | /** |
| 126 | * xprt_unregister_transport - unregister a transport implementation |
| 127 | * transport: transport to unregister |
| 128 | * |
| 129 | * Returns: |
| 130 | * 0: transport successfully unregistered |
| 131 | * -ENOENT: transport never registered |
| 132 | */ |
| 133 | int xprt_unregister_transport(struct xprt_class *transport) |
| 134 | { |
| 135 | struct xprt_class *t; |
| 136 | int result; |
| 137 | |
| 138 | result = 0; |
| 139 | spin_lock(&xprt_list_lock); |
| 140 | list_for_each_entry(t, &xprt_list, list) { |
| 141 | if (t == transport) { |
| 142 | printk(KERN_INFO |
| 143 | "RPC: Unregistered %s transport module.\n", |
| 144 | transport->name); |
| 145 | list_del_init(&transport->list); |
| 146 | module_put(THIS_MODULE); |
| 147 | goto out; |
| 148 | } |
| 149 | } |
| 150 | result = -ENOENT; |
| 151 | |
| 152 | out: |
| 153 | spin_unlock(&xprt_list_lock); |
| 154 | return result; |
| 155 | } |
| 156 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); |
| 157 | |
| 158 | /** |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 159 | * xprt_reserve_xprt - serialize write access to transports |
| 160 | * @task: task that is requesting access to the transport |
| 161 | * |
| 162 | * This prevents mixing the payload of separate requests, and prevents |
| 163 | * transport connects from colliding with writes. No congestion control |
| 164 | * is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | */ |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 166 | int xprt_reserve_xprt(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 168 | struct rpc_xprt *xprt = task->tk_xprt; |
| 169 | struct rpc_rqst *req = task->tk_rqstp; |
| 170 | |
| 171 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
| 172 | if (task == xprt->snd_task) |
| 173 | return 1; |
| 174 | if (task == NULL) |
| 175 | return 0; |
| 176 | goto out_sleep; |
| 177 | } |
| 178 | xprt->snd_task = task; |
| 179 | if (req) { |
| 180 | req->rq_bytes_sent = 0; |
| 181 | req->rq_ntrans++; |
| 182 | } |
| 183 | return 1; |
| 184 | |
| 185 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 186 | dprintk("RPC: %5u failed to lock transport %p\n", |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 187 | task->tk_pid, xprt); |
| 188 | task->tk_timeout = 0; |
| 189 | task->tk_status = -EAGAIN; |
| 190 | if (req && req->rq_ntrans) |
| 191 | rpc_sleep_on(&xprt->resend, task, NULL, NULL); |
| 192 | else |
| 193 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
| 194 | return 0; |
| 195 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 196 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 197 | |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 198 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
| 199 | { |
| 200 | xprt->snd_task = NULL; |
| 201 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { |
| 202 | smp_mb__before_clear_bit(); |
| 203 | clear_bit(XPRT_LOCKED, &xprt->state); |
| 204 | smp_mb__after_clear_bit(); |
| 205 | } else |
Trond Myklebust | c1384c9 | 2007-06-14 18:00:42 -0400 | [diff] [blame] | 206 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 207 | } |
| 208 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 209 | /* |
| 210 | * xprt_reserve_xprt_cong - serialize write access to transports |
| 211 | * @task: task that is requesting access to the transport |
| 212 | * |
| 213 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is |
| 214 | * integrated into the decision of whether a request is allowed to be |
| 215 | * woken up and given access to the transport. |
| 216 | */ |
| 217 | int xprt_reserve_xprt_cong(struct rpc_task *task) |
| 218 | { |
| 219 | struct rpc_xprt *xprt = task->tk_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | struct rpc_rqst *req = task->tk_rqstp; |
| 221 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 222 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | if (task == xprt->snd_task) |
| 224 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | goto out_sleep; |
| 226 | } |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 227 | if (__xprt_get_cong(xprt, task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | xprt->snd_task = task; |
| 229 | if (req) { |
| 230 | req->rq_bytes_sent = 0; |
| 231 | req->rq_ntrans++; |
| 232 | } |
| 233 | return 1; |
| 234 | } |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 235 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 237 | 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] | 238 | task->tk_timeout = 0; |
| 239 | task->tk_status = -EAGAIN; |
| 240 | if (req && req->rq_ntrans) |
| 241 | rpc_sleep_on(&xprt->resend, task, NULL, NULL); |
| 242 | else |
| 243 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
| 244 | return 0; |
| 245 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 246 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 248 | 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] | 249 | { |
| 250 | int retval; |
| 251 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 252 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 253 | retval = xprt->ops->reserve_xprt(task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 254 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | return retval; |
| 256 | } |
| 257 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 258 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
| 260 | struct rpc_task *task; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 261 | struct rpc_rqst *req; |
| 262 | |
| 263 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
| 264 | return; |
| 265 | |
| 266 | task = rpc_wake_up_next(&xprt->resend); |
| 267 | if (!task) { |
| 268 | task = rpc_wake_up_next(&xprt->sending); |
| 269 | if (!task) |
| 270 | goto out_unlock; |
| 271 | } |
| 272 | |
| 273 | req = task->tk_rqstp; |
| 274 | xprt->snd_task = task; |
| 275 | if (req) { |
| 276 | req->rq_bytes_sent = 0; |
| 277 | req->rq_ntrans++; |
| 278 | } |
| 279 | return; |
| 280 | |
| 281 | out_unlock: |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 282 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 283 | } |
| 284 | |
| 285 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) |
| 286 | { |
| 287 | struct rpc_task *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 289 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 291 | if (RPCXPRT_CONGESTED(xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | goto out_unlock; |
| 293 | task = rpc_wake_up_next(&xprt->resend); |
| 294 | if (!task) { |
| 295 | task = rpc_wake_up_next(&xprt->sending); |
| 296 | if (!task) |
| 297 | goto out_unlock; |
| 298 | } |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 299 | if (__xprt_get_cong(xprt, task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | struct rpc_rqst *req = task->tk_rqstp; |
| 301 | xprt->snd_task = task; |
| 302 | if (req) { |
| 303 | req->rq_bytes_sent = 0; |
| 304 | req->rq_ntrans++; |
| 305 | } |
| 306 | return; |
| 307 | } |
| 308 | out_unlock: |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 309 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 312 | /** |
| 313 | * xprt_release_xprt - allow other requests to use a transport |
| 314 | * @xprt: transport with other tasks potentially waiting |
| 315 | * @task: task that is releasing access to the transport |
| 316 | * |
| 317 | * Note that "task" can be NULL. No congestion control is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | */ |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 319 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | if (xprt->snd_task == task) { |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 322 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | __xprt_lock_write_next(xprt); |
| 324 | } |
| 325 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 326 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 328 | /** |
| 329 | * xprt_release_xprt_cong - allow other requests to use a transport |
| 330 | * @xprt: transport with other tasks potentially waiting |
| 331 | * @task: task that is releasing access to the transport |
| 332 | * |
| 333 | * Note that "task" can be NULL. Another task is awoken to use the |
| 334 | * transport if the transport's congestion window allows it. |
| 335 | */ |
| 336 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 337 | { |
| 338 | if (xprt->snd_task == task) { |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 339 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 340 | __xprt_lock_write_next_cong(xprt); |
| 341 | } |
| 342 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 343 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 344 | |
| 345 | 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] | 346 | { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 347 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 348 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 349 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | * Van Jacobson congestion avoidance. Check if the congestion window |
| 354 | * overflowed. Put the task to sleep if this is the case. |
| 355 | */ |
| 356 | static int |
| 357 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 358 | { |
| 359 | struct rpc_rqst *req = task->tk_rqstp; |
| 360 | |
| 361 | if (req->rq_cong) |
| 362 | return 1; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 363 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | task->tk_pid, xprt->cong, xprt->cwnd); |
| 365 | if (RPCXPRT_CONGESTED(xprt)) |
| 366 | return 0; |
| 367 | req->rq_cong = 1; |
| 368 | xprt->cong += RPC_CWNDSCALE; |
| 369 | return 1; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Adjust the congestion window, and wake up the next task |
| 374 | * that has been sleeping due to congestion |
| 375 | */ |
| 376 | static void |
| 377 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 378 | { |
| 379 | if (!req->rq_cong) |
| 380 | return; |
| 381 | req->rq_cong = 0; |
| 382 | xprt->cong -= RPC_CWNDSCALE; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 383 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | } |
| 385 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 386 | /** |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 387 | * xprt_release_rqst_cong - housekeeping when request is complete |
| 388 | * @task: RPC request that recently completed |
| 389 | * |
| 390 | * Useful for transports that require congestion control. |
| 391 | */ |
| 392 | void xprt_release_rqst_cong(struct rpc_task *task) |
| 393 | { |
| 394 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); |
| 395 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 396 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 397 | |
| 398 | /** |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 399 | * xprt_adjust_cwnd - adjust transport congestion window |
| 400 | * @task: recently completed RPC request used to adjust window |
| 401 | * @result: result code of completed RPC request |
| 402 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
| 404 | */ |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 405 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 407 | struct rpc_rqst *req = task->tk_rqstp; |
| 408 | struct rpc_xprt *xprt = task->tk_xprt; |
| 409 | unsigned long cwnd = xprt->cwnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | if (result >= 0 && cwnd <= xprt->cong) { |
| 412 | /* The (cwnd >> 1) term makes sure |
| 413 | * the result gets rounded properly. */ |
| 414 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
| 415 | if (cwnd > RPC_MAXCWND(xprt)) |
| 416 | cwnd = RPC_MAXCWND(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 417 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } else if (result == -ETIMEDOUT) { |
| 419 | cwnd >>= 1; |
| 420 | if (cwnd < RPC_CWNDSCALE) |
| 421 | cwnd = RPC_CWNDSCALE; |
| 422 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 423 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | xprt->cong, xprt->cwnd, cwnd); |
| 425 | xprt->cwnd = cwnd; |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 426 | __xprt_put_cong(xprt, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 428 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 430 | /** |
| 431 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
| 432 | * @xprt: transport with waiting tasks |
| 433 | * @status: result code to plant in each task before waking it |
| 434 | * |
| 435 | */ |
| 436 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
| 437 | { |
| 438 | if (status < 0) |
| 439 | rpc_wake_up_status(&xprt->pending, status); |
| 440 | else |
| 441 | rpc_wake_up(&xprt->pending); |
| 442 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 443 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 444 | |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 445 | /** |
| 446 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
| 447 | * @task: task to be put to sleep |
| 448 | * |
| 449 | */ |
| 450 | void xprt_wait_for_buffer_space(struct rpc_task *task) |
| 451 | { |
| 452 | struct rpc_rqst *req = task->tk_rqstp; |
| 453 | struct rpc_xprt *xprt = req->rq_xprt; |
| 454 | |
| 455 | task->tk_timeout = req->rq_timeout; |
| 456 | rpc_sleep_on(&xprt->pending, task, NULL, NULL); |
| 457 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 458 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 459 | |
| 460 | /** |
| 461 | * xprt_write_space - wake the task waiting for transport output buffer space |
| 462 | * @xprt: transport with waiting tasks |
| 463 | * |
| 464 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
| 465 | */ |
| 466 | void xprt_write_space(struct rpc_xprt *xprt) |
| 467 | { |
| 468 | if (unlikely(xprt->shutdown)) |
| 469 | return; |
| 470 | |
| 471 | spin_lock_bh(&xprt->transport_lock); |
| 472 | if (xprt->snd_task) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 473 | dprintk("RPC: write space: waking waiting task on " |
| 474 | "xprt %p\n", xprt); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 475 | rpc_wake_up_task(xprt->snd_task); |
| 476 | } |
| 477 | spin_unlock_bh(&xprt->transport_lock); |
| 478 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 479 | EXPORT_SYMBOL_GPL(xprt_write_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 480 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 481 | /** |
| 482 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
| 483 | * @task: task whose timeout is to be set |
| 484 | * |
| 485 | * Set a request's retransmit timeout based on the transport's |
| 486 | * default timeout parameters. Used by transports that don't adjust |
| 487 | * the retransmit timeout based on round-trip time estimation. |
| 488 | */ |
| 489 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
| 490 | { |
| 491 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
| 492 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 493 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 494 | |
| 495 | /* |
| 496 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
| 497 | * @task: task whose timeout is to be set |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 498 | * |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 499 | * Set a request's retransmit timeout using the RTT estimator. |
| 500 | */ |
| 501 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
| 502 | { |
| 503 | int timer = task->tk_msg.rpc_proc->p_timer; |
| 504 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
| 505 | struct rpc_rqst *req = task->tk_rqstp; |
| 506 | unsigned long max_timeout = req->rq_xprt->timeout.to_maxval; |
| 507 | |
| 508 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
| 509 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
| 510 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
| 511 | task->tk_timeout = max_timeout; |
| 512 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 513 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
| 516 | { |
| 517 | struct rpc_timeout *to = &req->rq_xprt->timeout; |
| 518 | |
| 519 | req->rq_majortimeo = req->rq_timeout; |
| 520 | if (to->to_exponential) |
| 521 | req->rq_majortimeo <<= to->to_retries; |
| 522 | else |
| 523 | req->rq_majortimeo += to->to_increment * to->to_retries; |
| 524 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
| 525 | req->rq_majortimeo = to->to_maxval; |
| 526 | req->rq_majortimeo += jiffies; |
| 527 | } |
| 528 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 529 | /** |
| 530 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
| 531 | * @req: RPC request containing parameters to use for the adjustment |
| 532 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | */ |
| 534 | int xprt_adjust_timeout(struct rpc_rqst *req) |
| 535 | { |
| 536 | struct rpc_xprt *xprt = req->rq_xprt; |
| 537 | struct rpc_timeout *to = &xprt->timeout; |
| 538 | int status = 0; |
| 539 | |
| 540 | if (time_before(jiffies, req->rq_majortimeo)) { |
| 541 | if (to->to_exponential) |
| 542 | req->rq_timeout <<= 1; |
| 543 | else |
| 544 | req->rq_timeout += to->to_increment; |
| 545 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
| 546 | req->rq_timeout = to->to_maxval; |
| 547 | req->rq_retries++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } else { |
| 549 | req->rq_timeout = to->to_initval; |
| 550 | req->rq_retries = 0; |
| 551 | xprt_reset_majortimeo(req); |
| 552 | /* Reset the RTT counters == "slow start" */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 553 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | 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] | 555 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | status = -ETIMEDOUT; |
| 557 | } |
| 558 | |
| 559 | if (req->rq_timeout == 0) { |
| 560 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
| 561 | req->rq_timeout = 5 * HZ; |
| 562 | } |
| 563 | return status; |
| 564 | } |
| 565 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 566 | static void xprt_autoclose(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 568 | struct rpc_xprt *xprt = |
| 569 | container_of(work, struct rpc_xprt, task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | xprt_disconnect(xprt); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 572 | xprt->ops->close(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | xprt_release_write(xprt, NULL); |
| 574 | } |
| 575 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 576 | /** |
| 577 | * xprt_disconnect - mark a transport as disconnected |
| 578 | * @xprt: transport to flag for disconnect |
| 579 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 581 | void xprt_disconnect(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 583 | dprintk("RPC: disconnected transport %p\n", xprt); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 584 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | xprt_clear_connected(xprt); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 586 | xprt_wake_pending_tasks(xprt, -ENOTCONN); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 587 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 589 | EXPORT_SYMBOL_GPL(xprt_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | static void |
| 592 | xprt_init_autodisconnect(unsigned long data) |
| 593 | { |
| 594 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
| 595 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 596 | spin_lock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
| 598 | goto out_abort; |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 599 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | goto out_abort; |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 601 | spin_unlock(&xprt->transport_lock); |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 602 | if (xprt_connecting(xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | xprt_release_write(xprt, NULL); |
| 604 | else |
Trond Myklebust | c1384c9 | 2007-06-14 18:00:42 -0400 | [diff] [blame] | 605 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return; |
| 607 | out_abort: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 608 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 611 | /** |
| 612 | * xprt_connect - schedule a transport connect operation |
| 613 | * @task: RPC task that is requesting the connect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | * |
| 615 | */ |
| 616 | void xprt_connect(struct rpc_task *task) |
| 617 | { |
| 618 | struct rpc_xprt *xprt = task->tk_xprt; |
| 619 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 620 | 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] | 621 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
| 622 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 623 | if (!xprt_bound(xprt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | task->tk_status = -EIO; |
| 625 | return; |
| 626 | } |
| 627 | if (!xprt_lock_write(xprt, task)) |
| 628 | return; |
| 629 | if (xprt_connected(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 630 | xprt_release_write(xprt, task); |
| 631 | else { |
| 632 | if (task->tk_rqstp) |
| 633 | task->tk_rqstp->rq_bytes_sent = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
Chuck Lever | 03bf4b7 | 2005-08-25 16:25:55 -0700 | [diff] [blame] | 635 | task->tk_timeout = xprt->connect_timeout; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 636 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 637 | xprt->stat.connect_start = jiffies; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 638 | xprt->ops->connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } |
| 642 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 643 | static void xprt_connect_status(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | { |
| 645 | struct rpc_xprt *xprt = task->tk_xprt; |
| 646 | |
| 647 | if (task->tk_status >= 0) { |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 648 | xprt->stat.connect_count++; |
| 649 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 650 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | task->tk_pid); |
| 652 | return; |
| 653 | } |
| 654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | switch (task->tk_status) { |
| 656 | case -ECONNREFUSED: |
| 657 | case -ECONNRESET: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 658 | dprintk("RPC: %5u xprt_connect_status: server %s refused " |
| 659 | "connection\n", task->tk_pid, |
| 660 | task->tk_client->cl_server); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 661 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | case -ENOTCONN: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 663 | dprintk("RPC: %5u xprt_connect_status: connection broken\n", |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 664 | task->tk_pid); |
| 665 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 667 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
| 668 | "out\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | break; |
| 670 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 671 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
| 672 | "server %s\n", task->tk_pid, -task->tk_status, |
| 673 | task->tk_client->cl_server); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 674 | xprt_release_write(xprt, task); |
| 675 | task->tk_status = -EIO; |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 676 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 679 | /** |
| 680 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
| 681 | * @xprt: transport on which the original request was transmitted |
| 682 | * @xid: RPC XID of incoming reply |
| 683 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 685 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | { |
| 687 | struct list_head *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
| 689 | list_for_each(pos, &xprt->recv) { |
| 690 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 691 | if (entry->rq_xid == xid) |
| 692 | return entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 694 | |
| 695 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", |
| 696 | ntohl(xid)); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 697 | xprt->stat.bad_xids++; |
| 698 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 700 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 702 | /** |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 703 | * xprt_update_rtt - update an RPC client's RTT state after receiving a reply |
| 704 | * @task: RPC request that recently completed |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 705 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | */ |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 707 | void xprt_update_rtt(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 709 | struct rpc_rqst *req = task->tk_rqstp; |
| 710 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
| 711 | unsigned timer = task->tk_msg.rpc_proc->p_timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 713 | if (timer) { |
| 714 | if (req->rq_ntrans == 1) |
| 715 | rpc_update_rtt(rtt, timer, |
| 716 | (long)jiffies - req->rq_xtime); |
| 717 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 719 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 720 | EXPORT_SYMBOL_GPL(xprt_update_rtt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 722 | /** |
| 723 | * xprt_complete_rqst - called when reply processing is complete |
| 724 | * @task: RPC request that recently completed |
| 725 | * @copied: actual number of bytes received from the transport |
| 726 | * |
| 727 | * Caller holds transport lock. |
| 728 | */ |
| 729 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
| 730 | { |
| 731 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 733 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
| 734 | task->tk_pid, ntohl(req->rq_xid), copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 736 | task->tk_xprt->stat.recvs++; |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 737 | task->tk_rtt = (long)jiffies - req->rq_xtime; |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | list_del_init(&req->rq_list); |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 740 | /* Ensure all writes are done before we update req->rq_received */ |
| 741 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | req->rq_received = req->rq_private_buf.len = copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | rpc_wake_up_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 745 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 747 | static void xprt_timer(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 749 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | struct rpc_xprt *xprt = req->rq_xprt; |
| 751 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 752 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 753 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 754 | spin_lock(&xprt->transport_lock); |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 755 | if (!req->rq_received) { |
| 756 | if (xprt->ops->timer) |
| 757 | xprt->ops->timer(task); |
| 758 | task->tk_status = -ETIMEDOUT; |
| 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | task->tk_timeout = 0; |
| 761 | rpc_wake_up_task(task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 762 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 765 | /** |
| 766 | * xprt_prepare_transmit - reserve the transport before sending a request |
| 767 | * @task: RPC task about to send a request |
| 768 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 770 | int xprt_prepare_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
| 772 | struct rpc_rqst *req = task->tk_rqstp; |
| 773 | struct rpc_xprt *xprt = req->rq_xprt; |
| 774 | int err = 0; |
| 775 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 776 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 778 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | if (req->rq_received && !req->rq_bytes_sent) { |
| 780 | err = req->rq_received; |
| 781 | goto out_unlock; |
| 782 | } |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 783 | if (!xprt->ops->reserve_xprt(task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | err = -EAGAIN; |
| 785 | goto out_unlock; |
| 786 | } |
| 787 | |
| 788 | if (!xprt_connected(xprt)) { |
| 789 | err = -ENOTCONN; |
| 790 | goto out_unlock; |
| 791 | } |
| 792 | out_unlock: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 793 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | return err; |
| 795 | } |
| 796 | |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 797 | void xprt_end_transmit(struct rpc_task *task) |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 798 | { |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 799 | xprt_release_write(task->tk_xprt, task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 800 | } |
| 801 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 802 | /** |
| 803 | * xprt_transmit - send an RPC request on a transport |
| 804 | * @task: controlling RPC task |
| 805 | * |
| 806 | * We have to copy the iovec because sendmsg fiddles with its contents. |
| 807 | */ |
| 808 | void xprt_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | struct rpc_rqst *req = task->tk_rqstp; |
| 811 | struct rpc_xprt *xprt = req->rq_xprt; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 812 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 814 | 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] | 815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | if (!req->rq_received) { |
| 817 | if (list_empty(&req->rq_list)) { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 818 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | /* Update the softirq receive buffer */ |
| 820 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
| 821 | sizeof(req->rq_private_buf)); |
| 822 | /* Add request to the receive list */ |
| 823 | list_add_tail(&req->rq_list, &xprt->recv); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 824 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | xprt_reset_majortimeo(req); |
Trond Myklebust | 0f9dc2b | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 826 | /* Turn off autodisconnect */ |
| 827 | del_singleshot_timer_sync(&xprt->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
| 829 | } else if (!req->rq_bytes_sent) |
| 830 | return; |
| 831 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 832 | status = xprt->ops->send_request(task); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 833 | if (status == 0) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 834 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 835 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 836 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 837 | xprt->ops->set_retrans_timeout(task); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 838 | |
| 839 | xprt->stat.sends++; |
| 840 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; |
| 841 | xprt->stat.bklog_u += xprt->backlog.qlen; |
| 842 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 843 | /* Don't race with disconnect */ |
| 844 | if (!xprt_connected(xprt)) |
| 845 | task->tk_status = -ENOTCONN; |
| 846 | else if (!req->rq_received) |
| 847 | rpc_sleep_on(&xprt->pending, task, NULL, xprt_timer); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 848 | spin_unlock_bh(&xprt->transport_lock); |
| 849 | return; |
| 850 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
| 852 | /* Note: at this point, task->tk_sleeping has not yet been set, |
| 853 | * hence there is no danger of the waking up task being put on |
| 854 | * schedq, and being picked up by a parallel run of rpciod(). |
| 855 | */ |
| 856 | task->tk_status = status; |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 857 | if (status == -ECONNREFUSED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
| 860 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 861 | static inline void do_xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | struct rpc_xprt *xprt = task->tk_xprt; |
| 864 | |
| 865 | task->tk_status = 0; |
| 866 | if (task->tk_rqstp) |
| 867 | return; |
| 868 | if (!list_empty(&xprt->free)) { |
| 869 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
| 870 | list_del_init(&req->rq_list); |
| 871 | task->tk_rqstp = req; |
| 872 | xprt_request_init(task, xprt); |
| 873 | return; |
| 874 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 875 | dprintk("RPC: waiting for request slot\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | task->tk_status = -EAGAIN; |
| 877 | task->tk_timeout = 0; |
| 878 | rpc_sleep_on(&xprt->backlog, task, NULL, NULL); |
| 879 | } |
| 880 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 881 | /** |
| 882 | * xprt_reserve - allocate an RPC request slot |
| 883 | * @task: RPC task requesting a slot allocation |
| 884 | * |
| 885 | * If no more slots are available, place the task on the transport's |
| 886 | * backlog queue. |
| 887 | */ |
| 888 | void xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | { |
| 890 | struct rpc_xprt *xprt = task->tk_xprt; |
| 891 | |
| 892 | task->tk_status = -EIO; |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 893 | spin_lock(&xprt->reserve_lock); |
| 894 | do_xprt_reserve(task); |
| 895 | spin_unlock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 898 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | { |
| 900 | return xprt->xid++; |
| 901 | } |
| 902 | |
| 903 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
| 904 | { |
Chuck Lever | bf3fcf8 | 2006-05-25 01:40:51 -0400 | [diff] [blame] | 905 | xprt->xid = net_random(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
| 907 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 908 | 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] | 909 | { |
| 910 | struct rpc_rqst *req = task->tk_rqstp; |
| 911 | |
| 912 | req->rq_timeout = xprt->timeout.to_initval; |
| 913 | req->rq_task = task; |
| 914 | req->rq_xprt = xprt; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 915 | req->rq_buffer = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | req->rq_xid = xprt_alloc_xid(xprt); |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 917 | req->rq_release_snd_buf = NULL; |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 918 | xprt_reset_majortimeo(req); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 919 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | req, ntohl(req->rq_xid)); |
| 921 | } |
| 922 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 923 | /** |
| 924 | * xprt_release - release an RPC request slot |
| 925 | * @task: task which is finished with the slot |
| 926 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 928 | void xprt_release(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
| 930 | struct rpc_xprt *xprt = task->tk_xprt; |
| 931 | struct rpc_rqst *req; |
| 932 | |
| 933 | if (!(req = task->tk_rqstp)) |
| 934 | return; |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 935 | rpc_count_iostats(task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 936 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 937 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 938 | if (xprt->ops->release_request) |
| 939 | xprt->ops->release_request(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | if (!list_empty(&req->rq_list)) |
| 941 | list_del(&req->rq_list); |
| 942 | xprt->last_used = jiffies; |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 943 | if (list_empty(&xprt->recv)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 944 | mod_timer(&xprt->timer, |
Chuck Lever | 03bf4b7 | 2005-08-25 16:25:55 -0700 | [diff] [blame] | 945 | xprt->last_used + xprt->idle_timeout); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 946 | spin_unlock_bh(&xprt->transport_lock); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 947 | xprt->ops->buf_free(req->rq_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | task->tk_rqstp = NULL; |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 949 | if (req->rq_release_snd_buf) |
| 950 | req->rq_release_snd_buf(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | memset(req, 0, sizeof(*req)); /* mark unused */ |
| 952 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 953 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 955 | spin_lock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | list_add(&req->rq_list, &xprt->free); |
Chuck Lever | 555ee3a | 2005-08-25 16:25:54 -0700 | [diff] [blame] | 957 | rpc_wake_up_next(&xprt->backlog); |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 958 | spin_unlock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 961 | /** |
| 962 | * xprt_set_timeout - set constant RPC timeout |
| 963 | * @to: RPC timeout parameters to set up |
| 964 | * @retr: number of retries |
| 965 | * @incr: amount of increase after each retry |
| 966 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 968 | void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 970 | to->to_initval = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | to->to_increment = incr; |
Chuck Lever | eab5c08 | 2005-08-11 16:25:14 -0400 | [diff] [blame] | 972 | to->to_maxval = to->to_initval + (incr * retr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | to->to_retries = retr; |
| 974 | to->to_exponential = 0; |
| 975 | } |
| 976 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 977 | /** |
| 978 | * xprt_create_transport - create an RPC transport |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 979 | * @args: rpc transport creation arguments |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 980 | * |
| 981 | */ |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 982 | struct rpc_xprt *xprt_create_transport(struct rpc_xprtsock_create *args) |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 983 | { |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 984 | struct rpc_xprt *xprt; |
| 985 | struct rpc_rqst *req; |
| 986 | |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 987 | switch (args->proto) { |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 988 | case IPPROTO_UDP: |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 989 | xprt = xs_setup_udp(args); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 990 | break; |
| 991 | case IPPROTO_TCP: |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 992 | xprt = xs_setup_tcp(args); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 993 | break; |
| 994 | default: |
| 995 | printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n", |
Frank van Maarseveen | 96802a0 | 2007-07-08 13:08:54 +0200 | [diff] [blame] | 996 | args->proto); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 997 | return ERR_PTR(-EIO); |
| 998 | } |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 999 | if (IS_ERR(xprt)) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1000 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1001 | -PTR_ERR(xprt)); |
| 1002 | return xprt; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1003 | } |
| 1004 | |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1005 | kref_init(&xprt->kref); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1006 | spin_lock_init(&xprt->transport_lock); |
| 1007 | spin_lock_init(&xprt->reserve_lock); |
| 1008 | |
| 1009 | INIT_LIST_HEAD(&xprt->free); |
| 1010 | INIT_LIST_HEAD(&xprt->recv); |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 1011 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1012 | init_timer(&xprt->timer); |
| 1013 | xprt->timer.function = xprt_init_autodisconnect; |
| 1014 | xprt->timer.data = (unsigned long) xprt; |
| 1015 | xprt->last_used = jiffies; |
| 1016 | xprt->cwnd = RPC_INITCWND; |
Chuck Lever | a509050 | 2007-03-29 16:48:04 -0400 | [diff] [blame] | 1017 | xprt->bind_index = 0; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1018 | |
| 1019 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); |
| 1020 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); |
| 1021 | rpc_init_wait_queue(&xprt->sending, "xprt_sending"); |
| 1022 | rpc_init_wait_queue(&xprt->resend, "xprt_resend"); |
| 1023 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
| 1024 | |
| 1025 | /* initialize free list */ |
| 1026 | for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) |
| 1027 | list_add(&req->rq_list, &xprt->free); |
| 1028 | |
| 1029 | xprt_init_xid(xprt); |
| 1030 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1031 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1032 | xprt->max_reqs); |
| 1033 | |
| 1034 | return xprt; |
| 1035 | } |
| 1036 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1037 | /** |
| 1038 | * xprt_destroy - destroy an RPC transport, killing off all requests. |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1039 | * @kref: kref for the transport to destroy |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1040 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | */ |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1042 | static void xprt_destroy(struct kref *kref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | { |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1044 | struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); |
| 1045 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1046 | dprintk("RPC: destroying transport %p\n", xprt); |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 1047 | xprt->shutdown = 1; |
| 1048 | del_timer_sync(&xprt->timer); |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1049 | |
| 1050 | /* |
| 1051 | * Tear down transport state and free the rpc_xprt |
| 1052 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 1053 | xprt->ops->destroy(xprt); |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1054 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1056 | /** |
| 1057 | * xprt_put - release a reference to an RPC transport. |
| 1058 | * @xprt: pointer to the transport |
| 1059 | * |
| 1060 | */ |
| 1061 | void xprt_put(struct rpc_xprt *xprt) |
| 1062 | { |
| 1063 | kref_put(&xprt->kref, xprt_destroy); |
| 1064 | } |
| 1065 | |
| 1066 | /** |
| 1067 | * xprt_get - return a reference to an RPC transport. |
| 1068 | * @xprt: pointer to the transport |
| 1069 | * |
| 1070 | */ |
| 1071 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) |
| 1072 | { |
| 1073 | kref_get(&xprt->kref); |
| 1074 | return xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | } |