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> |
| 44 | #include <linux/random.h> |
| 45 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 46 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | /* |
| 49 | * Local variables |
| 50 | */ |
| 51 | |
| 52 | #ifdef RPC_DEBUG |
| 53 | # undef RPC_DEBUG_DATA |
| 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 | |
| 65 | static int xprt_clear_backlog(struct rpc_xprt *xprt); |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /* |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 68 | * Serialize write access to transports, in order to prevent different |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * requests from interfering with each other. |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 70 | * Also prevents transport connects from colliding with writes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | */ |
| 72 | static int |
| 73 | __xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
| 74 | { |
| 75 | struct rpc_rqst *req = task->tk_rqstp; |
| 76 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 77 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if (task == xprt->snd_task) |
| 79 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | goto out_sleep; |
| 81 | } |
| 82 | if (xprt->nocong || __xprt_get_cong(xprt, task)) { |
| 83 | xprt->snd_task = task; |
| 84 | if (req) { |
| 85 | req->rq_bytes_sent = 0; |
| 86 | req->rq_ntrans++; |
| 87 | } |
| 88 | return 1; |
| 89 | } |
| 90 | smp_mb__before_clear_bit(); |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 91 | clear_bit(XPRT_LOCKED, &xprt->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | smp_mb__after_clear_bit(); |
| 93 | out_sleep: |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 94 | dprintk("RPC: %4d failed to lock transport %p\n", task->tk_pid, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | task->tk_timeout = 0; |
| 96 | task->tk_status = -EAGAIN; |
| 97 | if (req && req->rq_ntrans) |
| 98 | rpc_sleep_on(&xprt->resend, task, NULL, NULL); |
| 99 | else |
| 100 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static inline int |
| 105 | xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
| 106 | { |
| 107 | int retval; |
| 108 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 109 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | retval = __xprt_lock_write(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 111 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | return retval; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | static void |
| 117 | __xprt_lock_write_next(struct rpc_xprt *xprt) |
| 118 | { |
| 119 | struct rpc_task *task; |
| 120 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 121 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return; |
| 123 | if (!xprt->nocong && RPCXPRT_CONGESTED(xprt)) |
| 124 | goto out_unlock; |
| 125 | task = rpc_wake_up_next(&xprt->resend); |
| 126 | if (!task) { |
| 127 | task = rpc_wake_up_next(&xprt->sending); |
| 128 | if (!task) |
| 129 | goto out_unlock; |
| 130 | } |
| 131 | if (xprt->nocong || __xprt_get_cong(xprt, task)) { |
| 132 | struct rpc_rqst *req = task->tk_rqstp; |
| 133 | xprt->snd_task = task; |
| 134 | if (req) { |
| 135 | req->rq_bytes_sent = 0; |
| 136 | req->rq_ntrans++; |
| 137 | } |
| 138 | return; |
| 139 | } |
| 140 | out_unlock: |
| 141 | smp_mb__before_clear_bit(); |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 142 | clear_bit(XPRT_LOCKED, &xprt->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | smp_mb__after_clear_bit(); |
| 144 | } |
| 145 | |
| 146 | /* |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 147 | * Releases the transport for use by other requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | */ |
| 149 | static void |
| 150 | __xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) |
| 151 | { |
| 152 | if (xprt->snd_task == task) { |
| 153 | xprt->snd_task = NULL; |
| 154 | smp_mb__before_clear_bit(); |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 155 | clear_bit(XPRT_LOCKED, &xprt->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | smp_mb__after_clear_bit(); |
| 157 | __xprt_lock_write_next(xprt); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | static inline void |
| 162 | xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) |
| 163 | { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 164 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | __xprt_release_write(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 166 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | * Van Jacobson congestion avoidance. Check if the congestion window |
| 171 | * overflowed. Put the task to sleep if this is the case. |
| 172 | */ |
| 173 | static int |
| 174 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 175 | { |
| 176 | struct rpc_rqst *req = task->tk_rqstp; |
| 177 | |
| 178 | if (req->rq_cong) |
| 179 | return 1; |
| 180 | dprintk("RPC: %4d xprt_cwnd_limited cong = %ld cwnd = %ld\n", |
| 181 | task->tk_pid, xprt->cong, xprt->cwnd); |
| 182 | if (RPCXPRT_CONGESTED(xprt)) |
| 183 | return 0; |
| 184 | req->rq_cong = 1; |
| 185 | xprt->cong += RPC_CWNDSCALE; |
| 186 | return 1; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * Adjust the congestion window, and wake up the next task |
| 191 | * that has been sleeping due to congestion |
| 192 | */ |
| 193 | static void |
| 194 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 195 | { |
| 196 | if (!req->rq_cong) |
| 197 | return; |
| 198 | req->rq_cong = 0; |
| 199 | xprt->cong -= RPC_CWNDSCALE; |
| 200 | __xprt_lock_write_next(xprt); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Adjust RPC congestion window |
| 205 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
| 206 | */ |
| 207 | static void |
| 208 | xprt_adjust_cwnd(struct rpc_xprt *xprt, int result) |
| 209 | { |
| 210 | unsigned long cwnd; |
| 211 | |
| 212 | cwnd = xprt->cwnd; |
| 213 | if (result >= 0 && cwnd <= xprt->cong) { |
| 214 | /* The (cwnd >> 1) term makes sure |
| 215 | * the result gets rounded properly. */ |
| 216 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
| 217 | if (cwnd > RPC_MAXCWND(xprt)) |
| 218 | cwnd = RPC_MAXCWND(xprt); |
| 219 | __xprt_lock_write_next(xprt); |
| 220 | } else if (result == -ETIMEDOUT) { |
| 221 | cwnd >>= 1; |
| 222 | if (cwnd < RPC_CWNDSCALE) |
| 223 | cwnd = RPC_CWNDSCALE; |
| 224 | } |
| 225 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
| 226 | xprt->cong, xprt->cwnd, cwnd); |
| 227 | xprt->cwnd = cwnd; |
| 228 | } |
| 229 | |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 230 | /** |
| 231 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
| 232 | * @xprt: transport with waiting tasks |
| 233 | * @status: result code to plant in each task before waking it |
| 234 | * |
| 235 | */ |
| 236 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
| 237 | { |
| 238 | if (status < 0) |
| 239 | rpc_wake_up_status(&xprt->pending, status); |
| 240 | else |
| 241 | rpc_wake_up(&xprt->pending); |
| 242 | } |
| 243 | |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 244 | /** |
| 245 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
| 246 | * @task: task to be put to sleep |
| 247 | * |
| 248 | */ |
| 249 | void xprt_wait_for_buffer_space(struct rpc_task *task) |
| 250 | { |
| 251 | struct rpc_rqst *req = task->tk_rqstp; |
| 252 | struct rpc_xprt *xprt = req->rq_xprt; |
| 253 | |
| 254 | task->tk_timeout = req->rq_timeout; |
| 255 | rpc_sleep_on(&xprt->pending, task, NULL, NULL); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * xprt_write_space - wake the task waiting for transport output buffer space |
| 260 | * @xprt: transport with waiting tasks |
| 261 | * |
| 262 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
| 263 | */ |
| 264 | void xprt_write_space(struct rpc_xprt *xprt) |
| 265 | { |
| 266 | if (unlikely(xprt->shutdown)) |
| 267 | return; |
| 268 | |
| 269 | spin_lock_bh(&xprt->transport_lock); |
| 270 | if (xprt->snd_task) { |
| 271 | dprintk("RPC: write space: waking waiting task on xprt %p\n", |
| 272 | xprt); |
| 273 | rpc_wake_up_task(xprt->snd_task); |
| 274 | } |
| 275 | spin_unlock_bh(&xprt->transport_lock); |
| 276 | } |
| 277 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame^] | 278 | /** |
| 279 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
| 280 | * @task: task whose timeout is to be set |
| 281 | * |
| 282 | * Set a request's retransmit timeout based on the transport's |
| 283 | * default timeout parameters. Used by transports that don't adjust |
| 284 | * the retransmit timeout based on round-trip time estimation. |
| 285 | */ |
| 286 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
| 287 | { |
| 288 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
| 293 | * @task: task whose timeout is to be set |
| 294 | * |
| 295 | * Set a request's retransmit timeout using the RTT estimator. |
| 296 | */ |
| 297 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
| 298 | { |
| 299 | int timer = task->tk_msg.rpc_proc->p_timer; |
| 300 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
| 301 | struct rpc_rqst *req = task->tk_rqstp; |
| 302 | unsigned long max_timeout = req->rq_xprt->timeout.to_maxval; |
| 303 | |
| 304 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
| 305 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
| 306 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
| 307 | task->tk_timeout = max_timeout; |
| 308 | } |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
| 311 | { |
| 312 | struct rpc_timeout *to = &req->rq_xprt->timeout; |
| 313 | |
| 314 | req->rq_majortimeo = req->rq_timeout; |
| 315 | if (to->to_exponential) |
| 316 | req->rq_majortimeo <<= to->to_retries; |
| 317 | else |
| 318 | req->rq_majortimeo += to->to_increment * to->to_retries; |
| 319 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
| 320 | req->rq_majortimeo = to->to_maxval; |
| 321 | req->rq_majortimeo += jiffies; |
| 322 | } |
| 323 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 324 | /** |
| 325 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
| 326 | * @req: RPC request containing parameters to use for the adjustment |
| 327 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | */ |
| 329 | int xprt_adjust_timeout(struct rpc_rqst *req) |
| 330 | { |
| 331 | struct rpc_xprt *xprt = req->rq_xprt; |
| 332 | struct rpc_timeout *to = &xprt->timeout; |
| 333 | int status = 0; |
| 334 | |
| 335 | if (time_before(jiffies, req->rq_majortimeo)) { |
| 336 | if (to->to_exponential) |
| 337 | req->rq_timeout <<= 1; |
| 338 | else |
| 339 | req->rq_timeout += to->to_increment; |
| 340 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
| 341 | req->rq_timeout = to->to_maxval; |
| 342 | req->rq_retries++; |
| 343 | pprintk("RPC: %lu retrans\n", jiffies); |
| 344 | } else { |
| 345 | req->rq_timeout = to->to_initval; |
| 346 | req->rq_retries = 0; |
| 347 | xprt_reset_majortimeo(req); |
| 348 | /* Reset the RTT counters == "slow start" */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 349 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | 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] | 351 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | pprintk("RPC: %lu timeout\n", jiffies); |
| 353 | status = -ETIMEDOUT; |
| 354 | } |
| 355 | |
| 356 | if (req->rq_timeout == 0) { |
| 357 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
| 358 | req->rq_timeout = 5 * HZ; |
| 359 | } |
| 360 | return status; |
| 361 | } |
| 362 | |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 363 | static void xprt_autoclose(void *args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | { |
| 365 | struct rpc_xprt *xprt = (struct rpc_xprt *)args; |
| 366 | |
| 367 | xprt_disconnect(xprt); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 368 | xprt->ops->close(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | xprt_release_write(xprt, NULL); |
| 370 | } |
| 371 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 372 | /** |
| 373 | * xprt_disconnect - mark a transport as disconnected |
| 374 | * @xprt: transport to flag for disconnect |
| 375 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 377 | void xprt_disconnect(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | { |
| 379 | dprintk("RPC: disconnected transport %p\n", xprt); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 380 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | xprt_clear_connected(xprt); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 382 | xprt_wake_pending_tasks(xprt, -ENOTCONN); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 383 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | } |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | static void |
| 387 | xprt_init_autodisconnect(unsigned long data) |
| 388 | { |
| 389 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
| 390 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 391 | spin_lock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
| 393 | goto out_abort; |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 394 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | goto out_abort; |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 396 | spin_unlock(&xprt->transport_lock); |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 397 | if (xprt_connecting(xprt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | xprt_release_write(xprt, NULL); |
| 399 | else |
| 400 | schedule_work(&xprt->task_cleanup); |
| 401 | return; |
| 402 | out_abort: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 403 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 406 | /** |
| 407 | * xprt_connect - schedule a transport connect operation |
| 408 | * @task: RPC task that is requesting the connect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | * |
| 410 | */ |
| 411 | void xprt_connect(struct rpc_task *task) |
| 412 | { |
| 413 | struct rpc_xprt *xprt = task->tk_xprt; |
| 414 | |
| 415 | dprintk("RPC: %4d xprt_connect xprt %p %s connected\n", task->tk_pid, |
| 416 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
| 417 | |
| 418 | if (xprt->shutdown) { |
| 419 | task->tk_status = -EIO; |
| 420 | return; |
| 421 | } |
| 422 | if (!xprt->addr.sin_port) { |
| 423 | task->tk_status = -EIO; |
| 424 | return; |
| 425 | } |
| 426 | if (!xprt_lock_write(xprt, task)) |
| 427 | return; |
| 428 | if (xprt_connected(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 429 | xprt_release_write(xprt, task); |
| 430 | else { |
| 431 | if (task->tk_rqstp) |
| 432 | task->tk_rqstp->rq_bytes_sent = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 434 | task->tk_timeout = RPC_CONNECT_TIMEOUT; |
| 435 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL); |
| 436 | xprt->ops->connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } |
| 438 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 441 | static void xprt_connect_status(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
| 443 | struct rpc_xprt *xprt = task->tk_xprt; |
| 444 | |
| 445 | if (task->tk_status >= 0) { |
| 446 | dprintk("RPC: %4d xprt_connect_status: connection established\n", |
| 447 | task->tk_pid); |
| 448 | return; |
| 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | switch (task->tk_status) { |
| 452 | case -ECONNREFUSED: |
| 453 | case -ECONNRESET: |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 454 | dprintk("RPC: %4d xprt_connect_status: server %s refused connection\n", |
| 455 | task->tk_pid, task->tk_client->cl_server); |
| 456 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | case -ENOTCONN: |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 458 | dprintk("RPC: %4d xprt_connect_status: connection broken\n", |
| 459 | task->tk_pid); |
| 460 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | case -ETIMEDOUT: |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 462 | dprintk("RPC: %4d xprt_connect_status: connect attempt timed out\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | task->tk_pid); |
| 464 | break; |
| 465 | default: |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 466 | dprintk("RPC: %4d xprt_connect_status: error %d connecting to server %s\n", |
| 467 | task->tk_pid, -task->tk_status, task->tk_client->cl_server); |
| 468 | xprt_release_write(xprt, task); |
| 469 | task->tk_status = -EIO; |
| 470 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 472 | |
| 473 | /* if soft mounted, just cause this RPC to fail */ |
| 474 | if (RPC_IS_SOFT(task)) { |
| 475 | xprt_release_write(xprt, task); |
| 476 | task->tk_status = -EIO; |
| 477 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 480 | /** |
| 481 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
| 482 | * @xprt: transport on which the original request was transmitted |
| 483 | * @xid: RPC XID of incoming reply |
| 484 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 486 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
| 488 | struct list_head *pos; |
| 489 | struct rpc_rqst *req = NULL; |
| 490 | |
| 491 | list_for_each(pos, &xprt->recv) { |
| 492 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); |
| 493 | if (entry->rq_xid == xid) { |
| 494 | req = entry; |
| 495 | break; |
| 496 | } |
| 497 | } |
| 498 | return req; |
| 499 | } |
| 500 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 501 | /** |
| 502 | * xprt_complete_rqst - called when reply processing is complete |
| 503 | * @xprt: controlling transport |
| 504 | * @req: RPC request that just completed |
| 505 | * @copied: actual number of bytes received from the transport |
| 506 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 508 | void xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | struct rpc_task *task = req->rq_task; |
| 511 | struct rpc_clnt *clnt = task->tk_client; |
| 512 | |
| 513 | /* Adjust congestion window */ |
| 514 | if (!xprt->nocong) { |
| 515 | unsigned timer = task->tk_msg.rpc_proc->p_timer; |
| 516 | xprt_adjust_cwnd(xprt, copied); |
| 517 | __xprt_put_cong(xprt, req); |
| 518 | if (timer) { |
| 519 | if (req->rq_ntrans == 1) |
| 520 | rpc_update_rtt(clnt->cl_rtt, timer, |
| 521 | (long)jiffies - req->rq_xtime); |
| 522 | rpc_set_timeo(clnt->cl_rtt, timer, req->rq_ntrans - 1); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | #ifdef RPC_PROFILE |
| 527 | /* Profile only reads for now */ |
| 528 | if (copied > 1024) { |
| 529 | static unsigned long nextstat; |
| 530 | static unsigned long pkt_rtt, pkt_len, pkt_cnt; |
| 531 | |
| 532 | pkt_cnt++; |
| 533 | pkt_len += req->rq_slen + copied; |
| 534 | pkt_rtt += jiffies - req->rq_xtime; |
| 535 | if (time_before(nextstat, jiffies)) { |
| 536 | printk("RPC: %lu %ld cwnd\n", jiffies, xprt->cwnd); |
| 537 | printk("RPC: %ld %ld %ld %ld stat\n", |
| 538 | jiffies, pkt_cnt, pkt_len, pkt_rtt); |
| 539 | pkt_rtt = pkt_len = pkt_cnt = 0; |
| 540 | nextstat = jiffies + 5 * HZ; |
| 541 | } |
| 542 | } |
| 543 | #endif |
| 544 | |
| 545 | dprintk("RPC: %4d has input (%d bytes)\n", task->tk_pid, copied); |
| 546 | list_del_init(&req->rq_list); |
| 547 | req->rq_received = req->rq_private_buf.len = copied; |
| 548 | |
| 549 | /* ... and wake up the process. */ |
| 550 | rpc_wake_up_task(task); |
| 551 | return; |
| 552 | } |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | * RPC receive timeout handler. |
| 556 | */ |
| 557 | static void |
| 558 | xprt_timer(struct rpc_task *task) |
| 559 | { |
| 560 | struct rpc_rqst *req = task->tk_rqstp; |
| 561 | struct rpc_xprt *xprt = req->rq_xprt; |
| 562 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 563 | spin_lock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | if (req->rq_received) |
| 565 | goto out; |
| 566 | |
| 567 | xprt_adjust_cwnd(req->rq_xprt, -ETIMEDOUT); |
| 568 | __xprt_put_cong(xprt, req); |
| 569 | |
| 570 | dprintk("RPC: %4d xprt_timer (%s request)\n", |
| 571 | task->tk_pid, req ? "pending" : "backlogged"); |
| 572 | |
| 573 | task->tk_status = -ETIMEDOUT; |
| 574 | out: |
| 575 | task->tk_timeout = 0; |
| 576 | rpc_wake_up_task(task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 577 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 580 | /** |
| 581 | * xprt_prepare_transmit - reserve the transport before sending a request |
| 582 | * @task: RPC task about to send a request |
| 583 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 585 | int xprt_prepare_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
| 587 | struct rpc_rqst *req = task->tk_rqstp; |
| 588 | struct rpc_xprt *xprt = req->rq_xprt; |
| 589 | int err = 0; |
| 590 | |
| 591 | dprintk("RPC: %4d xprt_prepare_transmit\n", task->tk_pid); |
| 592 | |
| 593 | if (xprt->shutdown) |
| 594 | return -EIO; |
| 595 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 596 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (req->rq_received && !req->rq_bytes_sent) { |
| 598 | err = req->rq_received; |
| 599 | goto out_unlock; |
| 600 | } |
| 601 | if (!__xprt_lock_write(xprt, task)) { |
| 602 | err = -EAGAIN; |
| 603 | goto out_unlock; |
| 604 | } |
| 605 | |
| 606 | if (!xprt_connected(xprt)) { |
| 607 | err = -ENOTCONN; |
| 608 | goto out_unlock; |
| 609 | } |
| 610 | out_unlock: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 611 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | return err; |
| 613 | } |
| 614 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 615 | /** |
| 616 | * xprt_transmit - send an RPC request on a transport |
| 617 | * @task: controlling RPC task |
| 618 | * |
| 619 | * We have to copy the iovec because sendmsg fiddles with its contents. |
| 620 | */ |
| 621 | void xprt_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | struct rpc_rqst *req = task->tk_rqstp; |
| 624 | struct rpc_xprt *xprt = req->rq_xprt; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 625 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | dprintk("RPC: %4d xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
| 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | smp_rmb(); |
| 630 | if (!req->rq_received) { |
| 631 | if (list_empty(&req->rq_list)) { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 632 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* Update the softirq receive buffer */ |
| 634 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
| 635 | sizeof(req->rq_private_buf)); |
| 636 | /* Add request to the receive list */ |
| 637 | list_add_tail(&req->rq_list, &xprt->recv); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 638 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | xprt_reset_majortimeo(req); |
Trond Myklebust | 0f9dc2b | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 640 | /* Turn off autodisconnect */ |
| 641 | del_singleshot_timer_sync(&xprt->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | } |
| 643 | } else if (!req->rq_bytes_sent) |
| 644 | return; |
| 645 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 646 | status = xprt->ops->send_request(task); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame^] | 647 | if (status == 0) { |
| 648 | dprintk("RPC: %4d xmit complete\n", task->tk_pid); |
| 649 | spin_lock_bh(&xprt->transport_lock); |
| 650 | xprt->ops->set_retrans_timeout(task); |
| 651 | /* Don't race with disconnect */ |
| 652 | if (!xprt_connected(xprt)) |
| 653 | task->tk_status = -ENOTCONN; |
| 654 | else if (!req->rq_received) |
| 655 | rpc_sleep_on(&xprt->pending, task, NULL, xprt_timer); |
| 656 | __xprt_release_write(xprt, task); |
| 657 | spin_unlock_bh(&xprt->transport_lock); |
| 658 | return; |
| 659 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
| 661 | /* Note: at this point, task->tk_sleeping has not yet been set, |
| 662 | * hence there is no danger of the waking up task being put on |
| 663 | * schedq, and being picked up by a parallel run of rpciod(). |
| 664 | */ |
| 665 | task->tk_status = status; |
| 666 | |
| 667 | switch (status) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | case -ECONNREFUSED: |
| 669 | task->tk_timeout = RPC_REESTABLISH_TIMEOUT; |
| 670 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 671 | case -EAGAIN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | case -ENOTCONN: |
| 673 | return; |
| 674 | default: |
Chuck Lever | 43118c2 | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 675 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | xprt_release_write(xprt, task); |
| 678 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 681 | static inline void do_xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | { |
| 683 | struct rpc_xprt *xprt = task->tk_xprt; |
| 684 | |
| 685 | task->tk_status = 0; |
| 686 | if (task->tk_rqstp) |
| 687 | return; |
| 688 | if (!list_empty(&xprt->free)) { |
| 689 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
| 690 | list_del_init(&req->rq_list); |
| 691 | task->tk_rqstp = req; |
| 692 | xprt_request_init(task, xprt); |
| 693 | return; |
| 694 | } |
| 695 | dprintk("RPC: waiting for request slot\n"); |
| 696 | task->tk_status = -EAGAIN; |
| 697 | task->tk_timeout = 0; |
| 698 | rpc_sleep_on(&xprt->backlog, task, NULL, NULL); |
| 699 | } |
| 700 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 701 | /** |
| 702 | * xprt_reserve - allocate an RPC request slot |
| 703 | * @task: RPC task requesting a slot allocation |
| 704 | * |
| 705 | * If no more slots are available, place the task on the transport's |
| 706 | * backlog queue. |
| 707 | */ |
| 708 | void xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | { |
| 710 | struct rpc_xprt *xprt = task->tk_xprt; |
| 711 | |
| 712 | task->tk_status = -EIO; |
| 713 | if (!xprt->shutdown) { |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 714 | spin_lock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | do_xprt_reserve(task); |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 716 | spin_unlock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | } |
| 719 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | static inline u32 xprt_alloc_xid(struct rpc_xprt *xprt) |
| 721 | { |
| 722 | return xprt->xid++; |
| 723 | } |
| 724 | |
| 725 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
| 726 | { |
| 727 | get_random_bytes(&xprt->xid, sizeof(xprt->xid)); |
| 728 | } |
| 729 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 730 | 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] | 731 | { |
| 732 | struct rpc_rqst *req = task->tk_rqstp; |
| 733 | |
| 734 | req->rq_timeout = xprt->timeout.to_initval; |
| 735 | req->rq_task = task; |
| 736 | req->rq_xprt = xprt; |
| 737 | req->rq_xid = xprt_alloc_xid(xprt); |
| 738 | dprintk("RPC: %4d reserved req %p xid %08x\n", task->tk_pid, |
| 739 | req, ntohl(req->rq_xid)); |
| 740 | } |
| 741 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 742 | /** |
| 743 | * xprt_release - release an RPC request slot |
| 744 | * @task: task which is finished with the slot |
| 745 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 747 | void xprt_release(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | { |
| 749 | struct rpc_xprt *xprt = task->tk_xprt; |
| 750 | struct rpc_rqst *req; |
| 751 | |
| 752 | if (!(req = task->tk_rqstp)) |
| 753 | return; |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 754 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | __xprt_release_write(xprt, task); |
| 756 | __xprt_put_cong(xprt, req); |
| 757 | if (!list_empty(&req->rq_list)) |
| 758 | list_del(&req->rq_list); |
| 759 | xprt->last_used = jiffies; |
| 760 | if (list_empty(&xprt->recv) && !xprt->shutdown) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 761 | mod_timer(&xprt->timer, |
| 762 | xprt->last_used + RPC_IDLE_DISCONNECT_TIMEOUT); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 763 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | task->tk_rqstp = NULL; |
| 765 | memset(req, 0, sizeof(*req)); /* mark unused */ |
| 766 | |
| 767 | dprintk("RPC: %4d release request %p\n", task->tk_pid, req); |
| 768 | |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 769 | spin_lock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | list_add(&req->rq_list, &xprt->free); |
| 771 | xprt_clear_backlog(xprt); |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 772 | spin_unlock(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 775 | /** |
| 776 | * xprt_set_timeout - set constant RPC timeout |
| 777 | * @to: RPC timeout parameters to set up |
| 778 | * @retr: number of retries |
| 779 | * @incr: amount of increase after each retry |
| 780 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 782 | 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] | 783 | { |
| 784 | to->to_initval = |
| 785 | to->to_increment = incr; |
Chuck Lever | eab5c08 | 2005-08-11 16:25:14 -0400 | [diff] [blame] | 786 | to->to_maxval = to->to_initval + (incr * retr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | to->to_retries = retr; |
| 788 | to->to_exponential = 0; |
| 789 | } |
| 790 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 791 | static struct rpc_xprt *xprt_setup(int proto, struct sockaddr_in *ap, struct rpc_timeout *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | { |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 793 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | struct rpc_xprt *xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | struct rpc_rqst *req; |
| 796 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if ((xprt = kmalloc(sizeof(struct rpc_xprt), GFP_KERNEL)) == NULL) |
| 798 | return ERR_PTR(-ENOMEM); |
| 799 | memset(xprt, 0, sizeof(*xprt)); /* Nnnngh! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | xprt->addr = *ap; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 802 | |
| 803 | switch (proto) { |
| 804 | case IPPROTO_UDP: |
| 805 | result = xs_setup_udp(xprt, to); |
| 806 | break; |
| 807 | case IPPROTO_TCP: |
| 808 | result = xs_setup_tcp(xprt, to); |
| 809 | break; |
| 810 | default: |
| 811 | printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n", |
| 812 | proto); |
| 813 | result = -EIO; |
| 814 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 816 | if (result) { |
| 817 | kfree(xprt); |
| 818 | return ERR_PTR(result); |
| 819 | } |
| 820 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 821 | spin_lock_init(&xprt->transport_lock); |
Chuck Lever | 5dc0772 | 2005-08-11 16:25:35 -0400 | [diff] [blame] | 822 | spin_lock_init(&xprt->reserve_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | init_waitqueue_head(&xprt->cong_wait); |
| 824 | |
| 825 | INIT_LIST_HEAD(&xprt->free); |
| 826 | INIT_LIST_HEAD(&xprt->recv); |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 827 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | init_timer(&xprt->timer); |
| 829 | xprt->timer.function = xprt_init_autodisconnect; |
| 830 | xprt->timer.data = (unsigned long) xprt; |
| 831 | xprt->last_used = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
| 833 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); |
| 834 | rpc_init_wait_queue(&xprt->sending, "xprt_sending"); |
| 835 | rpc_init_wait_queue(&xprt->resend, "xprt_resend"); |
| 836 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
| 837 | |
| 838 | /* initialize free list */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 839 | for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | list_add(&req->rq_list, &xprt->free); |
| 841 | |
| 842 | xprt_init_xid(xprt); |
| 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
| 845 | xprt->max_reqs); |
| 846 | |
| 847 | return xprt; |
| 848 | } |
| 849 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 850 | /** |
| 851 | * xprt_create_proto - create an RPC client transport |
| 852 | * @proto: requested transport protocol |
| 853 | * @sap: remote peer's address |
| 854 | * @to: timeout parameters for new transport |
| 855 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 857 | struct rpc_xprt *xprt_create_proto(int proto, struct sockaddr_in *sap, struct rpc_timeout *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
| 859 | struct rpc_xprt *xprt; |
| 860 | |
| 861 | xprt = xprt_setup(proto, sap, to); |
| 862 | if (IS_ERR(xprt)) |
| 863 | dprintk("RPC: xprt_create_proto failed\n"); |
| 864 | else |
| 865 | dprintk("RPC: xprt_create_proto created xprt %p\n", xprt); |
| 866 | return xprt; |
| 867 | } |
| 868 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 869 | static void xprt_shutdown(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | { |
| 871 | xprt->shutdown = 1; |
| 872 | rpc_wake_up(&xprt->sending); |
| 873 | rpc_wake_up(&xprt->resend); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 874 | xprt_wake_pending_tasks(xprt, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | rpc_wake_up(&xprt->backlog); |
| 876 | wake_up(&xprt->cong_wait); |
| 877 | del_timer_sync(&xprt->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | } |
| 879 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 880 | static int xprt_clear_backlog(struct rpc_xprt *xprt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | rpc_wake_up_next(&xprt->backlog); |
| 882 | wake_up(&xprt->cong_wait); |
| 883 | return 1; |
| 884 | } |
| 885 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 886 | /** |
| 887 | * xprt_destroy - destroy an RPC transport, killing off all requests. |
| 888 | * @xprt: transport to destroy |
| 889 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 891 | int xprt_destroy(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | { |
| 893 | dprintk("RPC: destroying transport %p\n", xprt); |
| 894 | xprt_shutdown(xprt); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 895 | xprt->ops->destroy(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | kfree(xprt); |
| 897 | |
| 898 | return 0; |
| 899 | } |