Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/xprt.c |
| 3 | * |
| 4 | * This is a generic RPC call interface supporting congestion avoidance, |
| 5 | * and asynchronous calls. |
| 6 | * |
| 7 | * The interface works like this: |
| 8 | * |
| 9 | * - When a process places a call, it allocates a request slot if |
| 10 | * one is available. Otherwise, it sleeps on the backlog queue |
| 11 | * (xprt_reserve). |
| 12 | * - Next, the caller puts together the RPC message, stuffs it into |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 13 | * the request struct, and calls xprt_transmit(). |
| 14 | * - xprt_transmit sends the message and installs the caller on the |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 15 | * transport's wait list. At the same time, if a reply is expected, |
| 16 | * it installs a timer that is run after the packet's timeout has |
| 17 | * expired. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * - When a packet arrives, the data_ready handler walks the list of |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 19 | * pending requests for that transport. If a matching XID is found, the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * caller is woken up, and the timer removed. |
| 21 | * - When no reply arrives within the timeout interval, the timer is |
| 22 | * fired by the kernel and runs xprt_timer(). It either adjusts the |
| 23 | * timeout values (minor timeout) or wakes up the caller with a status |
| 24 | * of -ETIMEDOUT. |
| 25 | * - When the caller receives a notification from RPC that a reply arrived, |
| 26 | * it should release the RPC slot, and process the reply. |
| 27 | * If the call timed out, it may choose to retry the operation by |
| 28 | * adjusting the initial timeout value, and simply calling rpc_call |
| 29 | * again. |
| 30 | * |
| 31 | * Support for async RPC is done through a set of RPC-specific scheduling |
| 32 | * primitives that `transparently' work for processes as well as async |
| 33 | * tasks that rely on callbacks. |
| 34 | * |
| 35 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> |
Chuck Lever | 55aa4f5 | 2005-08-11 16:25:47 -0400 | [diff] [blame] | 36 | * |
| 37 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
| 39 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 40 | #include <linux/module.h> |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/types.h> |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 43 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/workqueue.h> |
Chuck Lever | bf3fcf8 | 2006-05-25 01:40:51 -0400 | [diff] [blame] | 45 | #include <linux/net.h> |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 46 | #include <linux/ktime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 48 | #include <linux/sunrpc/clnt.h> |
Chuck Lever | 11c556b | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 49 | #include <linux/sunrpc/metrics.h> |
Trond Myklebust | c9acb42 | 2010-03-19 15:36:22 -0400 | [diff] [blame] | 50 | #include <linux/sunrpc/bc_xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 52 | #include "sunrpc.h" |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | /* |
| 55 | * Local variables |
| 56 | */ |
| 57 | |
| 58 | #ifdef RPC_DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | # define RPCDBG_FACILITY RPCDBG_XPRT |
| 60 | #endif |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | /* |
| 63 | * Local functions |
| 64 | */ |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 65 | static void xprt_init(struct rpc_xprt *xprt, struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | static void xprt_connect_status(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
| 69 | |
Jiri Slaby | 5ba03e8 | 2007-11-22 19:40:22 +0800 | [diff] [blame] | 70 | static DEFINE_SPINLOCK(xprt_list_lock); |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 71 | static LIST_HEAD(xprt_list); |
| 72 | |
Chuck Lever | 555ee3a | 2005-08-25 16:25:54 -0700 | [diff] [blame] | 73 | /* |
| 74 | * The transport code maintains an estimate on the maximum number of out- |
| 75 | * standing RPC requests, using a smoothed version of the congestion |
| 76 | * avoidance implemented in 44BSD. This is basically the Van Jacobson |
| 77 | * congestion algorithm: If a retransmit occurs, the congestion window is |
| 78 | * halved; otherwise, it is incremented by 1/cwnd when |
| 79 | * |
| 80 | * - a reply is received and |
| 81 | * - a full number of requests are outstanding and |
| 82 | * - the congestion window hasn't been updated recently. |
| 83 | */ |
| 84 | #define RPC_CWNDSHIFT (8U) |
| 85 | #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) |
| 86 | #define RPC_INITCWND RPC_CWNDSCALE |
| 87 | #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) |
| 88 | |
| 89 | #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 91 | /** |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 92 | * xprt_register_transport - register a transport implementation |
| 93 | * @transport: transport to register |
| 94 | * |
| 95 | * If a transport implementation is loaded as a kernel module, it can |
| 96 | * call this interface to make itself known to the RPC client. |
| 97 | * |
| 98 | * Returns: |
| 99 | * 0: transport successfully registered |
| 100 | * -EEXIST: transport already registered |
| 101 | * -EINVAL: transport module being unloaded |
| 102 | */ |
| 103 | int xprt_register_transport(struct xprt_class *transport) |
| 104 | { |
| 105 | struct xprt_class *t; |
| 106 | int result; |
| 107 | |
| 108 | result = -EEXIST; |
| 109 | spin_lock(&xprt_list_lock); |
| 110 | list_for_each_entry(t, &xprt_list, list) { |
| 111 | /* don't register the same transport class twice */ |
\"Talpey, Thomas\ | 4fa016e | 2007-09-10 13:47:57 -0400 | [diff] [blame] | 112 | if (t->ident == transport->ident) |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 113 | goto out; |
| 114 | } |
| 115 | |
Denis V. Lunev | c9f6cde | 2008-07-31 09:53:56 +0400 | [diff] [blame] | 116 | list_add_tail(&transport->list, &xprt_list); |
| 117 | printk(KERN_INFO "RPC: Registered %s transport module.\n", |
| 118 | transport->name); |
| 119 | result = 0; |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 120 | |
| 121 | out: |
| 122 | spin_unlock(&xprt_list_lock); |
| 123 | return result; |
| 124 | } |
| 125 | EXPORT_SYMBOL_GPL(xprt_register_transport); |
| 126 | |
| 127 | /** |
| 128 | * xprt_unregister_transport - unregister a transport implementation |
Randy Dunlap | 65b6e42 | 2008-02-13 15:03:23 -0800 | [diff] [blame] | 129 | * @transport: transport to unregister |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 130 | * |
| 131 | * Returns: |
| 132 | * 0: transport successfully unregistered |
| 133 | * -ENOENT: transport never registered |
| 134 | */ |
| 135 | int xprt_unregister_transport(struct xprt_class *transport) |
| 136 | { |
| 137 | struct xprt_class *t; |
| 138 | int result; |
| 139 | |
| 140 | result = 0; |
| 141 | spin_lock(&xprt_list_lock); |
| 142 | list_for_each_entry(t, &xprt_list, list) { |
| 143 | if (t == transport) { |
| 144 | printk(KERN_INFO |
| 145 | "RPC: Unregistered %s transport module.\n", |
| 146 | transport->name); |
| 147 | list_del_init(&transport->list); |
\"Talpey, Thomas\ | 81c098a | 2007-09-10 13:46:00 -0400 | [diff] [blame] | 148 | goto out; |
| 149 | } |
| 150 | } |
| 151 | result = -ENOENT; |
| 152 | |
| 153 | out: |
| 154 | spin_unlock(&xprt_list_lock); |
| 155 | return result; |
| 156 | } |
| 157 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); |
| 158 | |
| 159 | /** |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 160 | * xprt_load_transport - load a transport implementation |
| 161 | * @transport_name: transport to load |
| 162 | * |
| 163 | * Returns: |
| 164 | * 0: transport successfully loaded |
| 165 | * -ENOENT: transport module not available |
| 166 | */ |
| 167 | int xprt_load_transport(const char *transport_name) |
| 168 | { |
| 169 | struct xprt_class *t; |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 170 | int result; |
| 171 | |
| 172 | result = 0; |
| 173 | spin_lock(&xprt_list_lock); |
| 174 | list_for_each_entry(t, &xprt_list, list) { |
| 175 | if (strcmp(t->name, transport_name) == 0) { |
| 176 | spin_unlock(&xprt_list_lock); |
| 177 | goto out; |
| 178 | } |
| 179 | } |
| 180 | spin_unlock(&xprt_list_lock); |
Alex Riesen | ef7ffe8 | 2010-05-24 14:33:05 -0700 | [diff] [blame] | 181 | result = request_module("xprt%s", transport_name); |
Tom Talpey | 441e3e2 | 2009-03-11 14:37:56 -0400 | [diff] [blame] | 182 | out: |
| 183 | return result; |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(xprt_load_transport); |
| 186 | |
| 187 | /** |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 188 | * xprt_reserve_xprt - serialize write access to transports |
| 189 | * @task: task that is requesting access to the transport |
Randy Dunlap | 177c27b | 2011-07-28 06:54:36 +0000 | [diff] [blame] | 190 | * @xprt: pointer to the target transport |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 191 | * |
| 192 | * This prevents mixing the payload of separate requests, and prevents |
| 193 | * transport connects from colliding with writes. No congestion control |
| 194 | * is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | */ |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 196 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 198 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 199 | int priority; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 200 | |
| 201 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
| 202 | if (task == xprt->snd_task) |
| 203 | return 1; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 204 | goto out_sleep; |
| 205 | } |
| 206 | xprt->snd_task = task; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 207 | if (req != NULL) { |
| 208 | req->rq_bytes_sent = 0; |
| 209 | req->rq_ntrans++; |
| 210 | } |
j223yang@asset.uwaterloo.ca | 4d4a76f | 2011-03-10 12:40:28 -0500 | [diff] [blame] | 211 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 212 | return 1; |
| 213 | |
| 214 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 215 | dprintk("RPC: %5u failed to lock transport %p\n", |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 216 | task->tk_pid, xprt); |
| 217 | task->tk_timeout = 0; |
| 218 | task->tk_status = -EAGAIN; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 219 | if (req == NULL) |
| 220 | priority = RPC_PRIORITY_LOW; |
| 221 | else if (!req->rq_ntrans) |
| 222 | priority = RPC_PRIORITY_NORMAL; |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 223 | else |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 224 | priority = RPC_PRIORITY_HIGH; |
| 225 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 226 | return 0; |
| 227 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 228 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 229 | |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 230 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
| 231 | { |
| 232 | xprt->snd_task = NULL; |
| 233 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { |
| 234 | smp_mb__before_clear_bit(); |
| 235 | clear_bit(XPRT_LOCKED, &xprt->state); |
| 236 | smp_mb__after_clear_bit(); |
| 237 | } else |
Trond Myklebust | c1384c9 | 2007-06-14 18:00:42 -0400 | [diff] [blame] | 238 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 239 | } |
| 240 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 241 | /* |
| 242 | * xprt_reserve_xprt_cong - serialize write access to transports |
| 243 | * @task: task that is requesting access to the transport |
| 244 | * |
| 245 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is |
| 246 | * integrated into the decision of whether a request is allowed to be |
| 247 | * woken up and given access to the transport. |
| 248 | */ |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 249 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 250 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 252 | int priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 254 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (task == xprt->snd_task) |
| 256 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | goto out_sleep; |
| 258 | } |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 259 | if (req == NULL) { |
| 260 | xprt->snd_task = task; |
| 261 | return 1; |
| 262 | } |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 263 | if (__xprt_get_cong(xprt, task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | xprt->snd_task = task; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 265 | req->rq_bytes_sent = 0; |
| 266 | req->rq_ntrans++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | return 1; |
| 268 | } |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 269 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | out_sleep: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 271 | 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] | 272 | task->tk_timeout = 0; |
| 273 | task->tk_status = -EAGAIN; |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 274 | if (req == NULL) |
| 275 | priority = RPC_PRIORITY_LOW; |
| 276 | else if (!req->rq_ntrans) |
| 277 | priority = RPC_PRIORITY_NORMAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | else |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 279 | priority = RPC_PRIORITY_HIGH; |
| 280 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return 0; |
| 282 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 283 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Chuck Lever | 12a8046 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 285 | 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] | 286 | { |
| 287 | int retval; |
| 288 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 289 | spin_lock_bh(&xprt->transport_lock); |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 290 | retval = xprt->ops->reserve_xprt(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 291 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return retval; |
| 293 | } |
| 294 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 295 | static bool __xprt_lock_write_func(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 297 | struct rpc_xprt *xprt = data; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 298 | struct rpc_rqst *req; |
| 299 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 300 | req = task->tk_rqstp; |
| 301 | xprt->snd_task = task; |
| 302 | if (req) { |
| 303 | req->rq_bytes_sent = 0; |
| 304 | req->rq_ntrans++; |
| 305 | } |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 306 | return true; |
| 307 | } |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 308 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 309 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
| 310 | { |
| 311 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
| 312 | return; |
| 313 | |
| 314 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt)) |
| 315 | return; |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 316 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 319 | static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data) |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 320 | { |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 321 | struct rpc_xprt *xprt = data; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 322 | struct rpc_rqst *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 324 | req = task->tk_rqstp; |
| 325 | if (req == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | xprt->snd_task = task; |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 327 | return true; |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 328 | } |
| 329 | if (__xprt_get_cong(xprt, task)) { |
| 330 | xprt->snd_task = task; |
| 331 | req->rq_bytes_sent = 0; |
| 332 | req->rq_ntrans++; |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 333 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 335 | return false; |
| 336 | } |
| 337 | |
| 338 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) |
| 339 | { |
| 340 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
| 341 | return; |
| 342 | if (RPCXPRT_CONGESTED(xprt)) |
| 343 | goto out_unlock; |
| 344 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt)) |
| 345 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | out_unlock: |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 347 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 350 | /** |
| 351 | * xprt_release_xprt - allow other requests to use a transport |
| 352 | * @xprt: transport with other tasks potentially waiting |
| 353 | * @task: task that is releasing access to the transport |
| 354 | * |
| 355 | * Note that "task" can be NULL. No congestion control is provided. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | */ |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 357 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | if (xprt->snd_task == task) { |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 360 | xprt_clear_locked(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | __xprt_lock_write_next(xprt); |
| 362 | } |
| 363 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 364 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 366 | /** |
| 367 | * xprt_release_xprt_cong - allow other requests to use a transport |
| 368 | * @xprt: transport with other tasks potentially waiting |
| 369 | * @task: task that is releasing access to the transport |
| 370 | * |
| 371 | * Note that "task" can be NULL. Another task is awoken to use the |
| 372 | * transport if the transport's congestion window allows it. |
| 373 | */ |
| 374 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 375 | { |
| 376 | if (xprt->snd_task == task) { |
Trond Myklebust | 632e3bd | 2006-01-03 09:55:55 +0100 | [diff] [blame] | 377 | xprt_clear_locked(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 378 | __xprt_lock_write_next_cong(xprt); |
| 379 | } |
| 380 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 381 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 382 | |
| 383 | 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] | 384 | { |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 385 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 386 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 387 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | * Van Jacobson congestion avoidance. Check if the congestion window |
| 392 | * overflowed. Put the task to sleep if this is the case. |
| 393 | */ |
| 394 | static int |
| 395 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
| 396 | { |
| 397 | struct rpc_rqst *req = task->tk_rqstp; |
| 398 | |
| 399 | if (req->rq_cong) |
| 400 | return 1; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 401 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | task->tk_pid, xprt->cong, xprt->cwnd); |
| 403 | if (RPCXPRT_CONGESTED(xprt)) |
| 404 | return 0; |
| 405 | req->rq_cong = 1; |
| 406 | xprt->cong += RPC_CWNDSCALE; |
| 407 | return 1; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | * Adjust the congestion window, and wake up the next task |
| 412 | * that has been sleeping due to congestion |
| 413 | */ |
| 414 | static void |
| 415 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 416 | { |
| 417 | if (!req->rq_cong) |
| 418 | return; |
| 419 | req->rq_cong = 0; |
| 420 | xprt->cong -= RPC_CWNDSCALE; |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 421 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } |
| 423 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 424 | /** |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 425 | * xprt_release_rqst_cong - housekeeping when request is complete |
| 426 | * @task: RPC request that recently completed |
| 427 | * |
| 428 | * Useful for transports that require congestion control. |
| 429 | */ |
| 430 | void xprt_release_rqst_cong(struct rpc_task *task) |
| 431 | { |
| 432 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); |
| 433 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 434 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 435 | |
| 436 | /** |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 437 | * xprt_adjust_cwnd - adjust transport congestion window |
| 438 | * @task: recently completed RPC request used to adjust window |
| 439 | * @result: result code of completed RPC request |
| 440 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
| 442 | */ |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 443 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 445 | struct rpc_rqst *req = task->tk_rqstp; |
| 446 | struct rpc_xprt *xprt = task->tk_xprt; |
| 447 | unsigned long cwnd = xprt->cwnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | if (result >= 0 && cwnd <= xprt->cong) { |
| 450 | /* The (cwnd >> 1) term makes sure |
| 451 | * the result gets rounded properly. */ |
| 452 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
| 453 | if (cwnd > RPC_MAXCWND(xprt)) |
| 454 | cwnd = RPC_MAXCWND(xprt); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 455 | __xprt_lock_write_next_cong(xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | } else if (result == -ETIMEDOUT) { |
| 457 | cwnd >>= 1; |
| 458 | if (cwnd < RPC_CWNDSCALE) |
| 459 | cwnd = RPC_CWNDSCALE; |
| 460 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 461 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | xprt->cong, xprt->cwnd, cwnd); |
| 463 | xprt->cwnd = cwnd; |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 464 | __xprt_put_cong(xprt, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 466 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 468 | /** |
| 469 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
| 470 | * @xprt: transport with waiting tasks |
| 471 | * @status: result code to plant in each task before waking it |
| 472 | * |
| 473 | */ |
| 474 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
| 475 | { |
| 476 | if (status < 0) |
| 477 | rpc_wake_up_status(&xprt->pending, status); |
| 478 | else |
| 479 | rpc_wake_up(&xprt->pending); |
| 480 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 481 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
Chuck Lever | 44fbac2 | 2005-08-11 16:25:44 -0400 | [diff] [blame] | 482 | |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 483 | /** |
| 484 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
| 485 | * @task: task to be put to sleep |
Randy Dunlap | 0b80ae4 | 2008-04-26 22:59:02 -0700 | [diff] [blame] | 486 | * @action: function pointer to be executed after wait |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 487 | */ |
Trond Myklebust | b6ddf64 | 2008-04-17 18:52:19 -0400 | [diff] [blame] | 488 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 489 | { |
| 490 | struct rpc_rqst *req = task->tk_rqstp; |
| 491 | struct rpc_xprt *xprt = req->rq_xprt; |
| 492 | |
| 493 | task->tk_timeout = req->rq_timeout; |
Trond Myklebust | b6ddf64 | 2008-04-17 18:52:19 -0400 | [diff] [blame] | 494 | rpc_sleep_on(&xprt->pending, task, action); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 495 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 496 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 497 | |
| 498 | /** |
| 499 | * xprt_write_space - wake the task waiting for transport output buffer space |
| 500 | * @xprt: transport with waiting tasks |
| 501 | * |
| 502 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
| 503 | */ |
| 504 | void xprt_write_space(struct rpc_xprt *xprt) |
| 505 | { |
| 506 | if (unlikely(xprt->shutdown)) |
| 507 | return; |
| 508 | |
| 509 | spin_lock_bh(&xprt->transport_lock); |
| 510 | if (xprt->snd_task) { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 511 | dprintk("RPC: write space: waking waiting task on " |
| 512 | "xprt %p\n", xprt); |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 513 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 514 | } |
| 515 | spin_unlock_bh(&xprt->transport_lock); |
| 516 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 517 | EXPORT_SYMBOL_GPL(xprt_write_space); |
Chuck Lever | c7b2cae | 2005-08-11 16:25:50 -0400 | [diff] [blame] | 518 | |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 519 | /** |
| 520 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
| 521 | * @task: task whose timeout is to be set |
| 522 | * |
| 523 | * Set a request's retransmit timeout based on the transport's |
| 524 | * default timeout parameters. Used by transports that don't adjust |
| 525 | * the retransmit timeout based on round-trip time estimation. |
| 526 | */ |
| 527 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
| 528 | { |
| 529 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
| 530 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 531 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 532 | |
| 533 | /* |
| 534 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
| 535 | * @task: task whose timeout is to be set |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 536 | * |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 537 | * Set a request's retransmit timeout using the RTT estimator. |
| 538 | */ |
| 539 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
| 540 | { |
| 541 | int timer = task->tk_msg.rpc_proc->p_timer; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 542 | struct rpc_clnt *clnt = task->tk_client; |
| 543 | struct rpc_rtt *rtt = clnt->cl_rtt; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 544 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 545 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 546 | |
| 547 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
| 548 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
| 549 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
| 550 | task->tk_timeout = max_timeout; |
| 551 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 552 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
| 555 | { |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 556 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | req->rq_majortimeo = req->rq_timeout; |
| 559 | if (to->to_exponential) |
| 560 | req->rq_majortimeo <<= to->to_retries; |
| 561 | else |
| 562 | req->rq_majortimeo += to->to_increment * to->to_retries; |
| 563 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
| 564 | req->rq_majortimeo = to->to_maxval; |
| 565 | req->rq_majortimeo += jiffies; |
| 566 | } |
| 567 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 568 | /** |
| 569 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
| 570 | * @req: RPC request containing parameters to use for the adjustment |
| 571 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | */ |
| 573 | int xprt_adjust_timeout(struct rpc_rqst *req) |
| 574 | { |
| 575 | struct rpc_xprt *xprt = req->rq_xprt; |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 576 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | int status = 0; |
| 578 | |
| 579 | if (time_before(jiffies, req->rq_majortimeo)) { |
| 580 | if (to->to_exponential) |
| 581 | req->rq_timeout <<= 1; |
| 582 | else |
| 583 | req->rq_timeout += to->to_increment; |
| 584 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
| 585 | req->rq_timeout = to->to_maxval; |
| 586 | req->rq_retries++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } else { |
| 588 | req->rq_timeout = to->to_initval; |
| 589 | req->rq_retries = 0; |
| 590 | xprt_reset_majortimeo(req); |
| 591 | /* Reset the RTT counters == "slow start" */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 592 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 594 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | status = -ETIMEDOUT; |
| 596 | } |
| 597 | |
| 598 | if (req->rq_timeout == 0) { |
| 599 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
| 600 | req->rq_timeout = 5 * HZ; |
| 601 | } |
| 602 | return status; |
| 603 | } |
| 604 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 605 | static void xprt_autoclose(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 607 | struct rpc_xprt *xprt = |
| 608 | container_of(work, struct rpc_xprt, task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 610 | xprt->ops->close(xprt); |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 611 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | xprt_release_write(xprt, NULL); |
| 613 | } |
| 614 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 615 | /** |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 616 | * xprt_disconnect_done - mark a transport as disconnected |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 617 | * @xprt: transport to flag for disconnect |
| 618 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | */ |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 620 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 622 | dprintk("RPC: disconnected transport %p\n", xprt); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 623 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | xprt_clear_connected(xprt); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 625 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 626 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 628 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 630 | /** |
| 631 | * xprt_force_disconnect - force a transport to disconnect |
| 632 | * @xprt: transport to disconnect |
| 633 | * |
| 634 | */ |
| 635 | void xprt_force_disconnect(struct rpc_xprt *xprt) |
| 636 | { |
| 637 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
| 638 | spin_lock_bh(&xprt->transport_lock); |
| 639 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 640 | /* Try to schedule an autoclose RPC call */ |
| 641 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
| 642 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 643 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 644 | spin_unlock_bh(&xprt->transport_lock); |
| 645 | } |
Trond Myklebust | 66af1e5 | 2007-11-06 10:18:36 -0500 | [diff] [blame] | 646 | |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 647 | /** |
| 648 | * xprt_conditional_disconnect - force a transport to disconnect |
| 649 | * @xprt: transport to disconnect |
| 650 | * @cookie: 'connection cookie' |
| 651 | * |
| 652 | * This attempts to break the connection if and only if 'cookie' matches |
| 653 | * the current transport 'connection cookie'. It ensures that we don't |
| 654 | * try to break the connection more than once when we need to retransmit |
| 655 | * a batch of RPC requests. |
| 656 | * |
| 657 | */ |
| 658 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) |
| 659 | { |
| 660 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
| 661 | spin_lock_bh(&xprt->transport_lock); |
| 662 | if (cookie != xprt->connect_cookie) |
| 663 | goto out; |
| 664 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) |
| 665 | goto out; |
| 666 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 667 | /* Try to schedule an autoclose RPC call */ |
| 668 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
| 669 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 670 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 671 | out: |
| 672 | spin_unlock_bh(&xprt->transport_lock); |
| 673 | } |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | static void |
| 676 | xprt_init_autodisconnect(unsigned long data) |
| 677 | { |
| 678 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
| 679 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 680 | spin_lock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
| 682 | goto out_abort; |
Chuck Lever | 2226feb | 2005-08-11 16:25:38 -0400 | [diff] [blame] | 683 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | goto out_abort; |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 685 | spin_unlock(&xprt->transport_lock); |
Trond Myklebust | f75e674 | 2009-04-21 17:18:20 -0400 | [diff] [blame] | 686 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
| 687 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | return; |
| 689 | out_abort: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 690 | spin_unlock(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
| 692 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 693 | /** |
| 694 | * xprt_connect - schedule a transport connect operation |
| 695 | * @task: RPC task that is requesting the connect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | * |
| 697 | */ |
| 698 | void xprt_connect(struct rpc_task *task) |
| 699 | { |
| 700 | struct rpc_xprt *xprt = task->tk_xprt; |
| 701 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 702 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
| 704 | |
Chuck Lever | ec739ef | 2006-08-22 20:06:15 -0400 | [diff] [blame] | 705 | if (!xprt_bound(xprt)) { |
Trond Myklebust | 01d37c4 | 2009-03-11 14:09:39 -0400 | [diff] [blame] | 706 | task->tk_status = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | return; |
| 708 | } |
| 709 | if (!xprt_lock_write(xprt, task)) |
| 710 | return; |
Trond Myklebust | feb8ca3 | 2009-12-03 08:10:17 -0500 | [diff] [blame] | 711 | |
| 712 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) |
| 713 | xprt->ops->close(xprt); |
| 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if (xprt_connected(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 716 | xprt_release_write(xprt, task); |
| 717 | else { |
Dan Carpenter | 87e3c05 | 2012-02-01 10:46:20 +0300 | [diff] [blame] | 718 | task->tk_rqstp->rq_bytes_sent = 0; |
Trond Myklebust | a8ce4a8 | 2010-04-16 16:42:12 -0400 | [diff] [blame] | 719 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 720 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
Trond Myklebust | 0b9e794 | 2010-04-16 16:41:57 -0400 | [diff] [blame] | 721 | |
| 722 | if (test_bit(XPRT_CLOSING, &xprt->state)) |
| 723 | return; |
| 724 | if (xprt_test_and_set_connecting(xprt)) |
| 725 | return; |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 726 | xprt->stat.connect_start = jiffies; |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 727 | xprt->ops->connect(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 731 | static void xprt_connect_status(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | struct rpc_xprt *xprt = task->tk_xprt; |
| 734 | |
Chuck Lever | cd983ef | 2008-06-11 17:56:13 -0400 | [diff] [blame] | 735 | if (task->tk_status == 0) { |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 736 | xprt->stat.connect_count++; |
| 737 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 738 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | task->tk_pid); |
| 740 | return; |
| 741 | } |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | switch (task->tk_status) { |
Trond Myklebust | 2a49199 | 2009-03-11 14:38:00 -0400 | [diff] [blame] | 744 | case -EAGAIN: |
| 745 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 746 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | case -ETIMEDOUT: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 748 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
| 749 | "out\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | break; |
| 751 | default: |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 752 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
| 753 | "server %s\n", task->tk_pid, -task->tk_status, |
| 754 | task->tk_client->cl_server); |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 755 | xprt_release_write(xprt, task); |
| 756 | task->tk_status = -EIO; |
Chuck Lever | 23475d6 | 2005-08-11 16:25:08 -0400 | [diff] [blame] | 757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
| 759 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 760 | /** |
| 761 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
| 762 | * @xprt: transport on which the original request was transmitted |
| 763 | * @xid: RPC XID of incoming reply |
| 764 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 766 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | { |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 768 | struct rpc_rqst *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 770 | list_for_each_entry(entry, &xprt->recv, rq_list) |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 771 | if (entry->rq_xid == xid) |
| 772 | return entry; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 773 | |
| 774 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", |
| 775 | ntohl(xid)); |
Chuck Lever | 262ca07 | 2006-03-20 13:44:16 -0500 | [diff] [blame] | 776 | xprt->stat.bad_xids++; |
| 777 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 779 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Chuck Lever | bbc72ce | 2010-05-07 13:34:27 -0400 | [diff] [blame] | 781 | static void xprt_update_rtt(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | { |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 783 | struct rpc_rqst *req = task->tk_rqstp; |
| 784 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
| 785 | unsigned timer = task->tk_msg.rpc_proc->p_timer; |
Trond Myklebust | d60dbb2 | 2010-05-13 12:51:49 -0400 | [diff] [blame] | 786 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 788 | if (timer) { |
| 789 | if (req->rq_ntrans == 1) |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 790 | rpc_update_rtt(rtt, timer, m); |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 791 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 793 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 795 | /** |
| 796 | * xprt_complete_rqst - called when reply processing is complete |
| 797 | * @task: RPC request that recently completed |
| 798 | * @copied: actual number of bytes received from the transport |
| 799 | * |
| 800 | * Caller holds transport lock. |
| 801 | */ |
| 802 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
| 803 | { |
| 804 | struct rpc_rqst *req = task->tk_rqstp; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 805 | struct rpc_xprt *xprt = req->rq_xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
Chuck Lever | 1570c1e | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 807 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
| 808 | task->tk_pid, ntohl(req->rq_xid), copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 810 | xprt->stat.recvs++; |
Trond Myklebust | d60dbb2 | 2010-05-13 12:51:49 -0400 | [diff] [blame] | 811 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
Chuck Lever | bbc72ce | 2010-05-07 13:34:27 -0400 | [diff] [blame] | 812 | if (xprt->ops->timer != NULL) |
| 813 | xprt_update_rtt(task); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | list_del_init(&req->rq_list); |
Trond Myklebust | 1e799b6 | 2008-03-21 16:19:41 -0400 | [diff] [blame] | 816 | req->rq_private_buf.len = copied; |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 817 | /* Ensure all writes are done before we update */ |
| 818 | /* req->rq_reply_bytes_recvd */ |
Trond Myklebust | 43ac3f2 | 2006-03-20 13:44:51 -0500 | [diff] [blame] | 819 | smp_wmb(); |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 820 | req->rq_reply_bytes_recvd = copied; |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 821 | rpc_wake_up_queued_task(&xprt->pending, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 823 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 825 | static void xprt_timer(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 827 | struct rpc_rqst *req = task->tk_rqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | struct rpc_xprt *xprt = req->rq_xprt; |
| 829 | |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 830 | if (task->tk_status != -ETIMEDOUT) |
| 831 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 832 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 833 | |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 834 | spin_lock_bh(&xprt->transport_lock); |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 835 | if (!req->rq_reply_bytes_recvd) { |
Chuck Lever | 46c0ee8 | 2005-08-25 16:25:52 -0700 | [diff] [blame] | 836 | if (xprt->ops->timer) |
| 837 | xprt->ops->timer(task); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 838 | } else |
| 839 | task->tk_status = 0; |
| 840 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
| 842 | |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 843 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
| 844 | { |
| 845 | return xprt->idle_timeout != 0; |
| 846 | } |
| 847 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 848 | /** |
| 849 | * xprt_prepare_transmit - reserve the transport before sending a request |
| 850 | * @task: RPC task about to send a request |
| 851 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 853 | int xprt_prepare_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | { |
| 855 | struct rpc_rqst *req = task->tk_rqstp; |
| 856 | struct rpc_xprt *xprt = req->rq_xprt; |
| 857 | int err = 0; |
| 858 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 859 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 861 | spin_lock_bh(&xprt->transport_lock); |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 862 | if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) { |
| 863 | err = req->rq_reply_bytes_recvd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | goto out_unlock; |
| 865 | } |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 866 | if (!xprt->ops->reserve_xprt(xprt, task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | err = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | out_unlock: |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 869 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return err; |
| 871 | } |
| 872 | |
Trond Myklebust | e0ab53d | 2006-07-27 17:22:50 -0400 | [diff] [blame] | 873 | void xprt_end_transmit(struct rpc_task *task) |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 874 | { |
Rahul Iyer | 343952f | 2009-04-01 09:23:17 -0400 | [diff] [blame] | 875 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
Trond Myklebust | 5e5ce5b | 2005-10-18 14:20:11 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 878 | /** |
| 879 | * xprt_transmit - send an RPC request on a transport |
| 880 | * @task: controlling RPC task |
| 881 | * |
| 882 | * We have to copy the iovec because sendmsg fiddles with its contents. |
| 883 | */ |
| 884 | void xprt_transmit(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | struct rpc_rqst *req = task->tk_rqstp; |
| 887 | struct rpc_xprt *xprt = req->rq_xprt; |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 888 | int status, numreqs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 890 | 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] | 891 | |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 892 | if (!req->rq_reply_bytes_recvd) { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 893 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
| 894 | /* |
| 895 | * Add to the list only if we're expecting a reply |
| 896 | */ |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 897 | spin_lock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | /* Update the softirq receive buffer */ |
| 899 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
| 900 | sizeof(req->rq_private_buf)); |
| 901 | /* Add request to the receive list */ |
| 902 | list_add_tail(&req->rq_list, &xprt->recv); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 903 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | xprt_reset_majortimeo(req); |
Trond Myklebust | 0f9dc2b | 2005-06-22 17:16:28 +0000 | [diff] [blame] | 905 | /* Turn off autodisconnect */ |
| 906 | del_singleshot_timer_sync(&xprt->timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | } else if (!req->rq_bytes_sent) |
| 909 | return; |
| 910 | |
Trond Myklebust | 7c1d71c | 2008-04-17 16:52:57 -0400 | [diff] [blame] | 911 | req->rq_connect_cookie = xprt->connect_cookie; |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 912 | req->rq_xtime = ktime_get(); |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 913 | status = xprt->ops->send_request(task); |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 914 | if (status != 0) { |
| 915 | task->tk_status = status; |
Chuck Lever | fe3aca2 | 2005-08-25 16:25:50 -0700 | [diff] [blame] | 916 | return; |
| 917 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 919 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
Bryan Schumaker | 468f861 | 2011-04-18 15:57:32 -0400 | [diff] [blame] | 920 | task->tk_flags |= RPC_TASK_SENT; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 921 | spin_lock_bh(&xprt->transport_lock); |
| 922 | |
| 923 | xprt->ops->set_retrans_timeout(task); |
| 924 | |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 925 | numreqs = atomic_read(&xprt->num_reqs); |
| 926 | if (numreqs > xprt->stat.max_slots) |
| 927 | xprt->stat.max_slots = numreqs; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 928 | xprt->stat.sends++; |
| 929 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; |
| 930 | xprt->stat.bklog_u += xprt->backlog.qlen; |
Andy Adamson | 15a4520 | 2012-02-14 16:19:18 -0500 | [diff] [blame] | 931 | xprt->stat.sending_u += xprt->sending.qlen; |
| 932 | xprt->stat.pending_u += xprt->pending.qlen; |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 933 | |
| 934 | /* Don't race with disconnect */ |
| 935 | if (!xprt_connected(xprt)) |
| 936 | task->tk_status = -ENOTCONN; |
Ricardo Labiaga | dd2b63d | 2009-04-01 09:23:28 -0400 | [diff] [blame] | 937 | else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 938 | /* |
| 939 | * Sleep on the pending queue since |
| 940 | * we're expecting a reply. |
| 941 | */ |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 942 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 943 | } |
Trond Myklebust | c8485e4 | 2009-03-11 14:37:59 -0400 | [diff] [blame] | 944 | spin_unlock_bh(&xprt->transport_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | } |
| 946 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 947 | static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags) |
| 948 | { |
| 949 | struct rpc_rqst *req = ERR_PTR(-EAGAIN); |
| 950 | |
| 951 | if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) |
| 952 | goto out; |
| 953 | req = kzalloc(sizeof(struct rpc_rqst), gfp_flags); |
| 954 | if (req != NULL) |
| 955 | goto out; |
| 956 | atomic_dec(&xprt->num_reqs); |
| 957 | req = ERR_PTR(-ENOMEM); |
| 958 | out: |
| 959 | return req; |
| 960 | } |
| 961 | |
| 962 | static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 963 | { |
| 964 | if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { |
| 965 | kfree(req); |
| 966 | return true; |
| 967 | } |
| 968 | return false; |
| 969 | } |
| 970 | |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 971 | static void xprt_alloc_slot(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | { |
| 973 | struct rpc_xprt *xprt = task->tk_xprt; |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 974 | struct rpc_rqst *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | if (!list_empty(&xprt->free)) { |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 977 | req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
| 978 | list_del(&req->rq_list); |
| 979 | goto out_init_req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | } |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 981 | req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT); |
| 982 | if (!IS_ERR(req)) |
| 983 | goto out_init_req; |
| 984 | switch (PTR_ERR(req)) { |
| 985 | case -ENOMEM: |
| 986 | rpc_delay(task, HZ >> 2); |
| 987 | dprintk("RPC: dynamic allocation of request slot " |
| 988 | "failed! Retrying\n"); |
| 989 | break; |
| 990 | case -EAGAIN: |
| 991 | rpc_sleep_on(&xprt->backlog, task, NULL); |
| 992 | dprintk("RPC: waiting for request slot\n"); |
| 993 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | task->tk_status = -EAGAIN; |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 995 | return; |
| 996 | out_init_req: |
| 997 | task->tk_status = 0; |
| 998 | task->tk_rqstp = req; |
| 999 | xprt_request_init(task, xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1002 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
| 1003 | { |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1004 | spin_lock(&xprt->reserve_lock); |
Trond Myklebust | c25573b | 2011-12-01 14:16:17 -0500 | [diff] [blame] | 1005 | if (!xprt_dynamic_free_slot(xprt, req)) { |
| 1006 | memset(req, 0, sizeof(*req)); /* mark unused */ |
| 1007 | list_add(&req->rq_list, &xprt->free); |
| 1008 | } |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1009 | rpc_wake_up_next(&xprt->backlog); |
| 1010 | spin_unlock(&xprt->reserve_lock); |
| 1011 | } |
| 1012 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1013 | static void xprt_free_all_slots(struct rpc_xprt *xprt) |
| 1014 | { |
| 1015 | struct rpc_rqst *req; |
| 1016 | while (!list_empty(&xprt->free)) { |
| 1017 | req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); |
| 1018 | list_del(&req->rq_list); |
| 1019 | kfree(req); |
| 1020 | } |
| 1021 | } |
| 1022 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1023 | struct rpc_xprt *xprt_alloc(struct net *net, size_t size, |
| 1024 | unsigned int num_prealloc, |
| 1025 | unsigned int max_alloc) |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1026 | { |
| 1027 | struct rpc_xprt *xprt; |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1028 | struct rpc_rqst *req; |
| 1029 | int i; |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1030 | |
| 1031 | xprt = kzalloc(size, GFP_KERNEL); |
| 1032 | if (xprt == NULL) |
| 1033 | goto out; |
| 1034 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1035 | xprt_init(xprt, net); |
| 1036 | |
| 1037 | for (i = 0; i < num_prealloc; i++) { |
| 1038 | req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); |
| 1039 | if (!req) |
| 1040 | break; |
| 1041 | list_add(&req->rq_list, &xprt->free); |
| 1042 | } |
| 1043 | if (i < num_prealloc) |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1044 | goto out_free; |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1045 | if (max_alloc > num_prealloc) |
| 1046 | xprt->max_reqs = max_alloc; |
| 1047 | else |
| 1048 | xprt->max_reqs = num_prealloc; |
| 1049 | xprt->min_reqs = num_prealloc; |
| 1050 | atomic_set(&xprt->num_reqs, num_prealloc); |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1051 | |
| 1052 | return xprt; |
| 1053 | |
| 1054 | out_free: |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1055 | xprt_free(xprt); |
Pavel Emelyanov | bd1722d | 2010-09-29 16:02:43 +0400 | [diff] [blame] | 1056 | out: |
| 1057 | return NULL; |
| 1058 | } |
| 1059 | EXPORT_SYMBOL_GPL(xprt_alloc); |
| 1060 | |
Pavel Emelyanov | e204e62 | 2010-09-29 16:03:13 +0400 | [diff] [blame] | 1061 | void xprt_free(struct rpc_xprt *xprt) |
| 1062 | { |
Pavel Emelyanov | 37aa213 | 2010-09-29 16:05:43 +0400 | [diff] [blame] | 1063 | put_net(xprt->xprt_net); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1064 | xprt_free_all_slots(xprt); |
Pavel Emelyanov | e204e62 | 2010-09-29 16:03:13 +0400 | [diff] [blame] | 1065 | kfree(xprt); |
| 1066 | } |
| 1067 | EXPORT_SYMBOL_GPL(xprt_free); |
| 1068 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1069 | /** |
| 1070 | * xprt_reserve - allocate an RPC request slot |
| 1071 | * @task: RPC task requesting a slot allocation |
| 1072 | * |
| 1073 | * If no more slots are available, place the task on the transport's |
| 1074 | * backlog queue. |
| 1075 | */ |
| 1076 | void xprt_reserve(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | { |
| 1078 | struct rpc_xprt *xprt = task->tk_xprt; |
| 1079 | |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 1080 | task->tk_status = 0; |
| 1081 | if (task->tk_rqstp != NULL) |
| 1082 | return; |
| 1083 | |
| 1084 | /* Note: grabbing the xprt_lock_write() here is not strictly needed, |
| 1085 | * but ensures that we throttle new slot allocation if the transport |
| 1086 | * is congested (e.g. if reconnecting or if we're out of socket |
| 1087 | * write buffer space). |
| 1088 | */ |
| 1089 | task->tk_timeout = 0; |
| 1090 | task->tk_status = -EAGAIN; |
| 1091 | if (!xprt_lock_write(xprt, task)) |
| 1092 | return; |
| 1093 | |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 1094 | spin_lock(&xprt->reserve_lock); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1095 | xprt_alloc_slot(task); |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 1096 | spin_unlock(&xprt->reserve_lock); |
Trond Myklebust | 43cedbf0e | 2011-07-17 16:01:03 -0400 | [diff] [blame] | 1097 | xprt_release_write(xprt, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1100 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1102 | return (__force __be32)xprt->xid++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
| 1106 | { |
Chuck Lever | bf3fcf8 | 2006-05-25 01:40:51 -0400 | [diff] [blame] | 1107 | xprt->xid = net_random(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | } |
| 1109 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1110 | 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] | 1111 | { |
| 1112 | struct rpc_rqst *req = task->tk_rqstp; |
| 1113 | |
Trond Myklebust | d9ba131 | 2011-07-17 18:11:30 -0400 | [diff] [blame] | 1114 | INIT_LIST_HEAD(&req->rq_list); |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 1115 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | req->rq_task = task; |
| 1117 | req->rq_xprt = xprt; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 1118 | req->rq_buffer = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | req->rq_xid = xprt_alloc_xid(xprt); |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 1120 | req->rq_release_snd_buf = NULL; |
Trond Myklebust | da45828 | 2006-08-31 15:44:52 -0400 | [diff] [blame] | 1121 | xprt_reset_majortimeo(req); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1122 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | req, ntohl(req->rq_xid)); |
| 1124 | } |
| 1125 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1126 | /** |
| 1127 | * xprt_release - release an RPC request slot |
| 1128 | * @task: task which is finished with the slot |
| 1129 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | */ |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1131 | void xprt_release(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | { |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1133 | struct rpc_xprt *xprt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | struct rpc_rqst *req; |
| 1135 | |
| 1136 | if (!(req = task->tk_rqstp)) |
| 1137 | return; |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1138 | |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1139 | xprt = req->rq_xprt; |
Weston Andros Adamson | 0a70219 | 2012-02-17 13:15:24 -0500 | [diff] [blame] | 1140 | if (task->tk_ops->rpc_count_stats != NULL) |
| 1141 | task->tk_ops->rpc_count_stats(task, task->tk_calldata); |
| 1142 | else if (task->tk_client) |
| 1143 | rpc_count_iostats(task, task->tk_client->cl_metrics); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 1144 | spin_lock_bh(&xprt->transport_lock); |
Chuck Lever | 49e9a89 | 2005-08-25 16:25:51 -0700 | [diff] [blame] | 1145 | xprt->ops->release_xprt(xprt, task); |
Chuck Lever | a58dd39 | 2005-08-25 16:25:53 -0700 | [diff] [blame] | 1146 | if (xprt->ops->release_request) |
| 1147 | xprt->ops->release_request(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | if (!list_empty(&req->rq_list)) |
| 1149 | list_del(&req->rq_list); |
| 1150 | xprt->last_used = jiffies; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1151 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 1152 | mod_timer(&xprt->timer, |
Chuck Lever | 03bf4b7 | 2005-08-25 16:25:55 -0700 | [diff] [blame] | 1153 | xprt->last_used + xprt->idle_timeout); |
Chuck Lever | 4a0f8c0 | 2005-08-11 16:25:32 -0400 | [diff] [blame] | 1154 | spin_unlock_bh(&xprt->transport_lock); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1155 | if (req->rq_buffer) |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1156 | xprt->ops->buf_free(req->rq_buffer); |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1157 | if (req->rq_cred != NULL) |
| 1158 | put_rpccred(req->rq_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | task->tk_rqstp = NULL; |
J. Bruce Fields | ead5e1c | 2005-10-13 16:54:43 -0400 | [diff] [blame] | 1160 | if (req->rq_release_snd_buf) |
| 1161 | req->rq_release_snd_buf(req); |
Ricardo Labiaga | 55ae1aa | 2009-04-01 09:23:03 -0400 | [diff] [blame] | 1162 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1163 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
Trond Myklebust | ee5ebe8 | 2010-04-16 16:37:01 -0400 | [diff] [blame] | 1164 | if (likely(!bc_prealloc(req))) |
| 1165 | xprt_free_slot(xprt, req); |
| 1166 | else |
Trond Myklebust | c9acb42 | 2010-03-19 15:36:22 -0400 | [diff] [blame] | 1167 | xprt_free_bc_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | } |
| 1169 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1170 | static void xprt_init(struct rpc_xprt *xprt, struct net *net) |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1171 | { |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1172 | atomic_set(&xprt->count, 1); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1173 | |
| 1174 | spin_lock_init(&xprt->transport_lock); |
| 1175 | spin_lock_init(&xprt->reserve_lock); |
| 1176 | |
| 1177 | INIT_LIST_HEAD(&xprt->free); |
| 1178 | INIT_LIST_HEAD(&xprt->recv); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1179 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Ricardo Labiaga | f9acac1 | 2009-04-01 09:22:59 -0400 | [diff] [blame] | 1180 | spin_lock_init(&xprt->bc_pa_lock); |
| 1181 | INIT_LIST_HEAD(&xprt->bc_pa_list); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1182 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
Ricardo Labiaga | f9acac1 | 2009-04-01 09:22:59 -0400 | [diff] [blame] | 1183 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1184 | xprt->last_used = jiffies; |
| 1185 | xprt->cwnd = RPC_INITCWND; |
Chuck Lever | a509050 | 2007-03-29 16:48:04 -0400 | [diff] [blame] | 1186 | xprt->bind_index = 0; |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1187 | |
| 1188 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); |
| 1189 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); |
Trond Myklebust | 34006ce | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 1190 | rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1191 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
| 1192 | |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1193 | xprt_init_xid(xprt); |
| 1194 | |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1195 | xprt->xprt_net = get_net(net); |
Trond Myklebust | 8d9266f | 2011-07-17 16:01:09 -0400 | [diff] [blame] | 1196 | } |
| 1197 | |
| 1198 | /** |
| 1199 | * xprt_create_transport - create an RPC transport |
| 1200 | * @args: rpc transport creation arguments |
| 1201 | * |
| 1202 | */ |
| 1203 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) |
| 1204 | { |
| 1205 | struct rpc_xprt *xprt; |
| 1206 | struct xprt_class *t; |
| 1207 | |
| 1208 | spin_lock(&xprt_list_lock); |
| 1209 | list_for_each_entry(t, &xprt_list, list) { |
| 1210 | if (t->ident == args->ident) { |
| 1211 | spin_unlock(&xprt_list_lock); |
| 1212 | goto found; |
| 1213 | } |
| 1214 | } |
| 1215 | spin_unlock(&xprt_list_lock); |
| 1216 | printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); |
| 1217 | return ERR_PTR(-EIO); |
| 1218 | |
| 1219 | found: |
| 1220 | xprt = t->setup(args); |
| 1221 | if (IS_ERR(xprt)) { |
| 1222 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
| 1223 | -PTR_ERR(xprt)); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1224 | goto out; |
Trond Myklebust | 8d9266f | 2011-07-17 16:01:09 -0400 | [diff] [blame] | 1225 | } |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1226 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
| 1227 | if (xprt_has_timer(xprt)) |
| 1228 | setup_timer(&xprt->timer, xprt_init_autodisconnect, |
| 1229 | (unsigned long)xprt); |
| 1230 | else |
| 1231 | init_timer(&xprt->timer); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1232 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1233 | xprt->max_reqs); |
Trond Myklebust | 21de0a9 | 2011-07-17 16:57:32 -0400 | [diff] [blame] | 1234 | out: |
Chuck Lever | c286676 | 2006-08-22 20:06:20 -0400 | [diff] [blame] | 1235 | return xprt; |
| 1236 | } |
| 1237 | |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1238 | /** |
| 1239 | * xprt_destroy - destroy an RPC transport, killing off all requests. |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1240 | * @xprt: transport to destroy |
Chuck Lever | 9903cd1 | 2005-08-11 16:25:26 -0400 | [diff] [blame] | 1241 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | */ |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1243 | static void xprt_destroy(struct rpc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1245 | dprintk("RPC: destroying transport %p\n", xprt); |
Trond Myklebust | 0065db3 | 2006-01-03 09:55:56 +0100 | [diff] [blame] | 1246 | xprt->shutdown = 1; |
| 1247 | del_timer_sync(&xprt->timer); |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1248 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1249 | rpc_destroy_wait_queue(&xprt->binding); |
| 1250 | rpc_destroy_wait_queue(&xprt->pending); |
| 1251 | rpc_destroy_wait_queue(&xprt->sending); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1252 | rpc_destroy_wait_queue(&xprt->backlog); |
J. Bruce Fields | c3ae62ae | 2010-08-03 17:22:20 -0400 | [diff] [blame] | 1253 | cancel_work_sync(&xprt->task_cleanup); |
Chuck Lever | c8541ec | 2006-10-17 14:44:27 -0400 | [diff] [blame] | 1254 | /* |
| 1255 | * Tear down transport state and free the rpc_xprt |
| 1256 | */ |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 1257 | xprt->ops->destroy(xprt); |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1260 | /** |
| 1261 | * xprt_put - release a reference to an RPC transport. |
| 1262 | * @xprt: pointer to the transport |
| 1263 | * |
| 1264 | */ |
| 1265 | void xprt_put(struct rpc_xprt *xprt) |
| 1266 | { |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1267 | if (atomic_dec_and_test(&xprt->count)) |
| 1268 | xprt_destroy(xprt); |
Trond Myklebust | 6b6ca86 | 2006-09-05 12:55:57 -0400 | [diff] [blame] | 1269 | } |
| 1270 | |
| 1271 | /** |
| 1272 | * xprt_get - return a reference to an RPC transport. |
| 1273 | * @xprt: pointer to the transport |
| 1274 | * |
| 1275 | */ |
| 1276 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) |
| 1277 | { |
Trond Myklebust | a8de240 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 1278 | if (atomic_inc_not_zero(&xprt->count)) |
| 1279 | return xprt; |
| 1280 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | } |