Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | * |
| 32 | */ |
| 33 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/gfp.h> |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 35 | #include <net/sock.h> |
| 36 | #include <linux/in.h> |
| 37 | #include <linux/list.h> |
| 38 | |
| 39 | #include "rds.h" |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 40 | |
| 41 | /* When transmitting messages in rds_send_xmit, we need to emerge from |
| 42 | * time to time and briefly release the CPU. Otherwise the softlock watchdog |
| 43 | * will kick our shin. |
| 44 | * Also, it seems fairer to not let one busy connection stall all the |
| 45 | * others. |
| 46 | * |
| 47 | * send_batch_count is the number of times we'll loop in send_xmit. Setting |
| 48 | * it to 0 will restore the old behavior (where we looped until we had |
| 49 | * drained the queue). |
| 50 | */ |
| 51 | static int send_batch_count = 64; |
| 52 | module_param(send_batch_count, int, 0444); |
| 53 | MODULE_PARM_DESC(send_batch_count, " batch factor when working the send queue"); |
| 54 | |
| 55 | /* |
| 56 | * Reset the send state. Caller must hold c_send_lock when calling here. |
| 57 | */ |
| 58 | void rds_send_reset(struct rds_connection *conn) |
| 59 | { |
| 60 | struct rds_message *rm, *tmp; |
| 61 | unsigned long flags; |
| 62 | |
| 63 | if (conn->c_xmit_rm) { |
| 64 | /* Tell the user the RDMA op is no longer mapped by the |
| 65 | * transport. This isn't entirely true (it's flushed out |
| 66 | * independently) but as the connection is down, there's |
| 67 | * no ongoing RDMA to/from that memory */ |
| 68 | rds_message_unmapped(conn->c_xmit_rm); |
| 69 | rds_message_put(conn->c_xmit_rm); |
| 70 | conn->c_xmit_rm = NULL; |
| 71 | } |
| 72 | conn->c_xmit_sg = 0; |
| 73 | conn->c_xmit_hdr_off = 0; |
| 74 | conn->c_xmit_data_off = 0; |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 75 | conn->c_xmit_atomic_sent = 0; |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 76 | conn->c_xmit_rdma_sent = 0; |
| 77 | conn->c_xmit_data_sent = 0; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 78 | |
| 79 | conn->c_map_queued = 0; |
| 80 | |
| 81 | conn->c_unacked_packets = rds_sysctl_max_unacked_packets; |
| 82 | conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes; |
| 83 | |
| 84 | /* Mark messages as retransmissions, and move them to the send q */ |
| 85 | spin_lock_irqsave(&conn->c_lock, flags); |
| 86 | list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) { |
| 87 | set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags); |
| 88 | set_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags); |
| 89 | } |
| 90 | list_splice_init(&conn->c_retrans, &conn->c_send_queue); |
| 91 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * We're making the concious trade-off here to only send one message |
| 96 | * down the connection at a time. |
| 97 | * Pro: |
| 98 | * - tx queueing is a simple fifo list |
| 99 | * - reassembly is optional and easily done by transports per conn |
| 100 | * - no per flow rx lookup at all, straight to the socket |
| 101 | * - less per-frag memory and wire overhead |
| 102 | * Con: |
| 103 | * - queued acks can be delayed behind large messages |
| 104 | * Depends: |
| 105 | * - small message latency is higher behind queued large messages |
| 106 | * - large message latency isn't starved by intervening small sends |
| 107 | */ |
| 108 | int rds_send_xmit(struct rds_connection *conn) |
| 109 | { |
| 110 | struct rds_message *rm; |
| 111 | unsigned long flags; |
| 112 | unsigned int tmp; |
| 113 | unsigned int send_quota = send_batch_count; |
| 114 | struct scatterlist *sg; |
| 115 | int ret = 0; |
| 116 | int was_empty = 0; |
| 117 | LIST_HEAD(to_be_dropped); |
| 118 | |
| 119 | /* |
| 120 | * sendmsg calls here after having queued its message on the send |
| 121 | * queue. We only have one task feeding the connection at a time. If |
| 122 | * another thread is already feeding the queue then we back off. This |
| 123 | * avoids blocking the caller and trading per-connection data between |
| 124 | * caches per message. |
| 125 | * |
| 126 | * The sem holder will issue a retry if they notice that someone queued |
| 127 | * a message after they stopped walking the send queue but before they |
| 128 | * dropped the sem. |
| 129 | */ |
| 130 | if (!mutex_trylock(&conn->c_send_lock)) { |
| 131 | rds_stats_inc(s_send_sem_contention); |
| 132 | ret = -ENOMEM; |
| 133 | goto out; |
| 134 | } |
| 135 | |
| 136 | if (conn->c_trans->xmit_prepare) |
| 137 | conn->c_trans->xmit_prepare(conn); |
| 138 | |
| 139 | /* |
| 140 | * spin trying to push headers and data down the connection until |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 141 | * the connection doesn't make forward progress. |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 142 | */ |
| 143 | while (--send_quota) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 144 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 145 | rm = conn->c_xmit_rm; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 146 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 147 | /* |
| 148 | * If between sending messages, we can send a pending congestion |
| 149 | * map update. |
| 150 | * |
| 151 | * Transports either define a special xmit_cong_map function, |
| 152 | * or we allocate a cong_map message and treat it just like any |
| 153 | * other send. |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 154 | */ |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 155 | if (!rm && test_and_clear_bit(0, &conn->c_map_queued)) { |
| 156 | if (conn->c_trans->xmit_cong_map) { |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 157 | unsigned long map_offset = 0; |
| 158 | unsigned long map_bytes = sizeof(struct rds_header) + |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 159 | RDS_CONG_MAP_BYTES; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 160 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 161 | while (map_bytes) { |
| 162 | ret = conn->c_trans->xmit_cong_map(conn, conn->c_lcong, |
| 163 | map_offset); |
| 164 | if (ret <= 0) { |
| 165 | /* too far down the rabbithole! */ |
| 166 | mutex_unlock(&conn->c_send_lock); |
| 167 | rds_conn_error(conn, "Cong map xmit failed\n"); |
| 168 | goto out; |
| 169 | } |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 170 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 171 | map_offset += ret; |
| 172 | map_bytes -= ret; |
| 173 | } |
| 174 | } else { |
| 175 | /* send cong update like a normal rm */ |
| 176 | rm = rds_cong_update_alloc(conn); |
| 177 | if (IS_ERR(rm)) { |
| 178 | ret = PTR_ERR(rm); |
| 179 | break; |
| 180 | } |
| 181 | rm->data.op_active = 1; |
| 182 | |
| 183 | conn->c_xmit_rm = rm; |
| 184 | } |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | /* |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 188 | * If not already working on one, grab the next message. |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 189 | * |
| 190 | * c_xmit_rm holds a ref while we're sending this message down |
| 191 | * the connction. We can use this ref while holding the |
| 192 | * send_sem.. rds_send_reset() is serialized with it. |
| 193 | */ |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 194 | if (!rm) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 195 | unsigned int len; |
| 196 | |
| 197 | spin_lock_irqsave(&conn->c_lock, flags); |
| 198 | |
| 199 | if (!list_empty(&conn->c_send_queue)) { |
| 200 | rm = list_entry(conn->c_send_queue.next, |
| 201 | struct rds_message, |
| 202 | m_conn_item); |
| 203 | rds_message_addref(rm); |
| 204 | |
| 205 | /* |
| 206 | * Move the message from the send queue to the retransmit |
| 207 | * list right away. |
| 208 | */ |
| 209 | list_move_tail(&rm->m_conn_item, &conn->c_retrans); |
| 210 | } |
| 211 | |
| 212 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 213 | |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 214 | if (!rm) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 215 | was_empty = 1; |
| 216 | break; |
| 217 | } |
| 218 | |
| 219 | /* Unfortunately, the way Infiniband deals with |
| 220 | * RDMA to a bad MR key is by moving the entire |
| 221 | * queue pair to error state. We cold possibly |
| 222 | * recover from that, but right now we drop the |
| 223 | * connection. |
| 224 | * Therefore, we never retransmit messages with RDMA ops. |
| 225 | */ |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 226 | if (rm->rdma.op_active && |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 227 | test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 228 | spin_lock_irqsave(&conn->c_lock, flags); |
| 229 | if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags)) |
| 230 | list_move(&rm->m_conn_item, &to_be_dropped); |
| 231 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 232 | rds_message_put(rm); |
| 233 | continue; |
| 234 | } |
| 235 | |
| 236 | /* Require an ACK every once in a while */ |
| 237 | len = ntohl(rm->m_inc.i_hdr.h_len); |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 238 | if (conn->c_unacked_packets == 0 || |
| 239 | conn->c_unacked_bytes < len) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 240 | __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags); |
| 241 | |
| 242 | conn->c_unacked_packets = rds_sysctl_max_unacked_packets; |
| 243 | conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes; |
| 244 | rds_stats_inc(s_send_ack_required); |
| 245 | } else { |
| 246 | conn->c_unacked_bytes -= len; |
| 247 | conn->c_unacked_packets--; |
| 248 | } |
| 249 | |
| 250 | conn->c_xmit_rm = rm; |
| 251 | } |
| 252 | |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 253 | if (rm->atomic.op_active && !conn->c_xmit_atomic_sent) { |
Andy Grover | 241eef3 | 2010-01-19 21:25:26 -0800 | [diff] [blame] | 254 | ret = conn->c_trans->xmit_atomic(conn, rm); |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 255 | if (ret) |
| 256 | break; |
| 257 | conn->c_xmit_atomic_sent = 1; |
| 258 | /* The transport owns the mapped memory for now. |
| 259 | * You can't unmap it while it's on the send queue */ |
| 260 | set_bit(RDS_MSG_MAPPED, &rm->m_flags); |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * This is evil, muahaha. |
| 264 | * We permit 0-byte sends. (rds-ping depends on this.) |
| 265 | * BUT if there is an atomic op and no sent data, |
| 266 | * we turn off sending the header, to achieve |
| 267 | * "silent" atomics. |
| 268 | * But see below; RDMA op might toggle this back on! |
| 269 | */ |
| 270 | if (rm->data.op_nents == 0) |
| 271 | rm->data.op_active = 0; |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 272 | } |
| 273 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 274 | /* The transport either sends the whole rdma or none of it */ |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 275 | if (rm->rdma.op_active && !conn->c_xmit_rdma_sent) { |
| 276 | ret = conn->c_trans->xmit_rdma(conn, &rm->rdma); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 277 | if (ret) |
| 278 | break; |
| 279 | conn->c_xmit_rdma_sent = 1; |
Andy Grover | 241eef3 | 2010-01-19 21:25:26 -0800 | [diff] [blame] | 280 | |
| 281 | /* rdmas need data sent, even if just the header */ |
| 282 | rm->data.op_active = 1; |
| 283 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 284 | /* The transport owns the mapped memory for now. |
| 285 | * You can't unmap it while it's on the send queue */ |
| 286 | set_bit(RDS_MSG_MAPPED, &rm->m_flags); |
| 287 | } |
| 288 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 289 | if (rm->data.op_active && !conn->c_xmit_data_sent) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 290 | ret = conn->c_trans->xmit(conn, rm, |
| 291 | conn->c_xmit_hdr_off, |
| 292 | conn->c_xmit_sg, |
| 293 | conn->c_xmit_data_off); |
| 294 | if (ret <= 0) |
| 295 | break; |
| 296 | |
| 297 | if (conn->c_xmit_hdr_off < sizeof(struct rds_header)) { |
| 298 | tmp = min_t(int, ret, |
| 299 | sizeof(struct rds_header) - |
| 300 | conn->c_xmit_hdr_off); |
| 301 | conn->c_xmit_hdr_off += tmp; |
| 302 | ret -= tmp; |
| 303 | } |
| 304 | |
Andy Grover | 6c7cc6e | 2010-01-27 18:04:18 -0800 | [diff] [blame] | 305 | sg = &rm->data.op_sg[conn->c_xmit_sg]; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 306 | while (ret) { |
| 307 | tmp = min_t(int, ret, sg->length - |
| 308 | conn->c_xmit_data_off); |
| 309 | conn->c_xmit_data_off += tmp; |
| 310 | ret -= tmp; |
| 311 | if (conn->c_xmit_data_off == sg->length) { |
| 312 | conn->c_xmit_data_off = 0; |
| 313 | sg++; |
| 314 | conn->c_xmit_sg++; |
| 315 | BUG_ON(ret != 0 && |
Andy Grover | 6c7cc6e | 2010-01-27 18:04:18 -0800 | [diff] [blame] | 316 | conn->c_xmit_sg == rm->data.op_nents); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 317 | } |
| 318 | } |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 319 | |
| 320 | if (conn->c_xmit_hdr_off == sizeof(struct rds_header) && |
| 321 | (conn->c_xmit_sg == rm->data.op_nents)) |
| 322 | conn->c_xmit_data_sent = 1; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * A rm will only take multiple times through this loop |
| 327 | * if there is a data op. Thus, if the data is sent (or there was |
| 328 | * none), then we're done with the rm. |
| 329 | */ |
| 330 | if (!rm->data.op_active || conn->c_xmit_data_sent) { |
| 331 | conn->c_xmit_rm = NULL; |
| 332 | conn->c_xmit_sg = 0; |
| 333 | conn->c_xmit_hdr_off = 0; |
| 334 | conn->c_xmit_data_off = 0; |
| 335 | conn->c_xmit_rdma_sent = 0; |
| 336 | conn->c_xmit_atomic_sent = 0; |
| 337 | conn->c_xmit_data_sent = 0; |
| 338 | |
| 339 | rds_message_put(rm); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | |
| 343 | /* Nuke any messages we decided not to retransmit. */ |
| 344 | if (!list_empty(&to_be_dropped)) |
| 345 | rds_send_remove_from_sock(&to_be_dropped, RDS_RDMA_DROPPED); |
| 346 | |
| 347 | if (conn->c_trans->xmit_complete) |
| 348 | conn->c_trans->xmit_complete(conn); |
| 349 | |
| 350 | /* |
| 351 | * We might be racing with another sender who queued a message but |
| 352 | * backed off on noticing that we held the c_send_lock. If we check |
| 353 | * for queued messages after dropping the sem then either we'll |
| 354 | * see the queued message or the queuer will get the sem. If we |
| 355 | * notice the queued message then we trigger an immediate retry. |
| 356 | * |
| 357 | * We need to be careful only to do this when we stopped processing |
| 358 | * the send queue because it was empty. It's the only way we |
| 359 | * stop processing the loop when the transport hasn't taken |
| 360 | * responsibility for forward progress. |
| 361 | */ |
| 362 | mutex_unlock(&conn->c_send_lock); |
| 363 | |
Andy Grover | 5b2366b | 2010-02-03 19:36:44 -0800 | [diff] [blame] | 364 | if (send_quota == 0 && !was_empty) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 365 | /* We exhausted the send quota, but there's work left to |
| 366 | * do. Return and (re-)schedule the send worker. |
| 367 | */ |
| 368 | ret = -EAGAIN; |
| 369 | } |
| 370 | |
| 371 | if (ret == 0 && was_empty) { |
| 372 | /* A simple bit test would be way faster than taking the |
| 373 | * spin lock */ |
| 374 | spin_lock_irqsave(&conn->c_lock, flags); |
| 375 | if (!list_empty(&conn->c_send_queue)) { |
| 376 | rds_stats_inc(s_send_sem_queue_raced); |
| 377 | ret = -EAGAIN; |
| 378 | } |
| 379 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 380 | } |
| 381 | out: |
| 382 | return ret; |
| 383 | } |
| 384 | |
| 385 | static void rds_send_sndbuf_remove(struct rds_sock *rs, struct rds_message *rm) |
| 386 | { |
| 387 | u32 len = be32_to_cpu(rm->m_inc.i_hdr.h_len); |
| 388 | |
| 389 | assert_spin_locked(&rs->rs_lock); |
| 390 | |
| 391 | BUG_ON(rs->rs_snd_bytes < len); |
| 392 | rs->rs_snd_bytes -= len; |
| 393 | |
| 394 | if (rs->rs_snd_bytes == 0) |
| 395 | rds_stats_inc(s_send_queue_empty); |
| 396 | } |
| 397 | |
| 398 | static inline int rds_send_is_acked(struct rds_message *rm, u64 ack, |
| 399 | is_acked_func is_acked) |
| 400 | { |
| 401 | if (is_acked) |
| 402 | return is_acked(rm, ack); |
| 403 | return be64_to_cpu(rm->m_inc.i_hdr.h_sequence) <= ack; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Returns true if there are no messages on the send and retransmit queues |
| 408 | * which have a sequence number greater than or equal to the given sequence |
| 409 | * number. |
| 410 | */ |
| 411 | int rds_send_acked_before(struct rds_connection *conn, u64 seq) |
| 412 | { |
| 413 | struct rds_message *rm, *tmp; |
| 414 | int ret = 1; |
| 415 | |
| 416 | spin_lock(&conn->c_lock); |
| 417 | |
| 418 | list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) { |
| 419 | if (be64_to_cpu(rm->m_inc.i_hdr.h_sequence) < seq) |
| 420 | ret = 0; |
| 421 | break; |
| 422 | } |
| 423 | |
| 424 | list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) { |
| 425 | if (be64_to_cpu(rm->m_inc.i_hdr.h_sequence) < seq) |
| 426 | ret = 0; |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | spin_unlock(&conn->c_lock); |
| 431 | |
| 432 | return ret; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * This is pretty similar to what happens below in the ACK |
| 437 | * handling code - except that we call here as soon as we get |
| 438 | * the IB send completion on the RDMA op and the accompanying |
| 439 | * message. |
| 440 | */ |
| 441 | void rds_rdma_send_complete(struct rds_message *rm, int status) |
| 442 | { |
| 443 | struct rds_sock *rs = NULL; |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 444 | struct rm_rdma_op *ro; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 445 | struct rds_notifier *notifier; |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 446 | unsigned long flags; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 447 | |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 448 | spin_lock_irqsave(&rm->m_rs_lock, flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 449 | |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 450 | ro = &rm->rdma; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 451 | if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) && |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 452 | ro->op_active && ro->op_notify && ro->op_notifier) { |
| 453 | notifier = ro->op_notifier; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 454 | rs = rm->m_rs; |
| 455 | sock_hold(rds_rs_to_sk(rs)); |
| 456 | |
| 457 | notifier->n_status = status; |
| 458 | spin_lock(&rs->rs_lock); |
| 459 | list_add_tail(¬ifier->n_list, &rs->rs_notify_queue); |
| 460 | spin_unlock(&rs->rs_lock); |
| 461 | |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 462 | ro->op_notifier = NULL; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 463 | } |
| 464 | |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 465 | spin_unlock_irqrestore(&rm->m_rs_lock, flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 466 | |
| 467 | if (rs) { |
| 468 | rds_wake_sk_sleep(rs); |
| 469 | sock_put(rds_rs_to_sk(rs)); |
| 470 | } |
| 471 | } |
Andy Grover | 616b757 | 2009-08-21 12:28:32 +0000 | [diff] [blame] | 472 | EXPORT_SYMBOL_GPL(rds_rdma_send_complete); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 473 | |
| 474 | /* |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 475 | * Just like above, except looks at atomic op |
| 476 | */ |
| 477 | void rds_atomic_send_complete(struct rds_message *rm, int status) |
| 478 | { |
| 479 | struct rds_sock *rs = NULL; |
| 480 | struct rm_atomic_op *ao; |
| 481 | struct rds_notifier *notifier; |
| 482 | |
| 483 | spin_lock(&rm->m_rs_lock); |
| 484 | |
| 485 | ao = &rm->atomic; |
| 486 | if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) |
| 487 | && ao->op_active && ao->op_notify && ao->op_notifier) { |
| 488 | notifier = ao->op_notifier; |
| 489 | rs = rm->m_rs; |
| 490 | sock_hold(rds_rs_to_sk(rs)); |
| 491 | |
| 492 | notifier->n_status = status; |
| 493 | spin_lock(&rs->rs_lock); |
| 494 | list_add_tail(¬ifier->n_list, &rs->rs_notify_queue); |
| 495 | spin_unlock(&rs->rs_lock); |
| 496 | |
| 497 | ao->op_notifier = NULL; |
| 498 | } |
| 499 | |
| 500 | spin_unlock(&rm->m_rs_lock); |
| 501 | |
| 502 | if (rs) { |
| 503 | rds_wake_sk_sleep(rs); |
| 504 | sock_put(rds_rs_to_sk(rs)); |
| 505 | } |
| 506 | } |
| 507 | EXPORT_SYMBOL_GPL(rds_atomic_send_complete); |
| 508 | |
| 509 | /* |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 510 | * This is the same as rds_rdma_send_complete except we |
| 511 | * don't do any locking - we have all the ingredients (message, |
| 512 | * socket, socket lock) and can just move the notifier. |
| 513 | */ |
| 514 | static inline void |
Andy Grover | 940786e | 2010-02-19 18:04:58 -0800 | [diff] [blame^] | 515 | __rds_send_complete(struct rds_sock *rs, struct rds_message *rm, int status) |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 516 | { |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 517 | struct rm_rdma_op *ro; |
Andy Grover | 940786e | 2010-02-19 18:04:58 -0800 | [diff] [blame^] | 518 | struct rm_atomic_op *ao; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 519 | |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 520 | ro = &rm->rdma; |
| 521 | if (ro->op_active && ro->op_notify && ro->op_notifier) { |
| 522 | ro->op_notifier->n_status = status; |
| 523 | list_add_tail(&ro->op_notifier->n_list, &rs->rs_notify_queue); |
| 524 | ro->op_notifier = NULL; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 525 | } |
| 526 | |
Andy Grover | 940786e | 2010-02-19 18:04:58 -0800 | [diff] [blame^] | 527 | ao = &rm->atomic; |
| 528 | if (ao->op_active && ao->op_notify && ao->op_notifier) { |
| 529 | ao->op_notifier->n_status = status; |
| 530 | list_add_tail(&ao->op_notifier->n_list, &rs->rs_notify_queue); |
| 531 | ao->op_notifier = NULL; |
| 532 | } |
| 533 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 534 | /* No need to wake the app - caller does this */ |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * This is called from the IB send completion when we detect |
| 539 | * a RDMA operation that failed with remote access error. |
| 540 | * So speed is not an issue here. |
| 541 | */ |
| 542 | struct rds_message *rds_send_get_message(struct rds_connection *conn, |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 543 | struct rm_rdma_op *op) |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 544 | { |
| 545 | struct rds_message *rm, *tmp, *found = NULL; |
| 546 | unsigned long flags; |
| 547 | |
| 548 | spin_lock_irqsave(&conn->c_lock, flags); |
| 549 | |
| 550 | list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) { |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 551 | if (&rm->rdma == op) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 552 | atomic_inc(&rm->m_refcount); |
| 553 | found = rm; |
| 554 | goto out; |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) { |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 559 | if (&rm->rdma == op) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 560 | atomic_inc(&rm->m_refcount); |
| 561 | found = rm; |
| 562 | break; |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | out: |
| 567 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 568 | |
| 569 | return found; |
| 570 | } |
Andy Grover | 616b757 | 2009-08-21 12:28:32 +0000 | [diff] [blame] | 571 | EXPORT_SYMBOL_GPL(rds_send_get_message); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 572 | |
| 573 | /* |
| 574 | * This removes messages from the socket's list if they're on it. The list |
| 575 | * argument must be private to the caller, we must be able to modify it |
| 576 | * without locks. The messages must have a reference held for their |
| 577 | * position on the list. This function will drop that reference after |
| 578 | * removing the messages from the 'messages' list regardless of if it found |
| 579 | * the messages on the socket list or not. |
| 580 | */ |
| 581 | void rds_send_remove_from_sock(struct list_head *messages, int status) |
| 582 | { |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 583 | unsigned long flags; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 584 | struct rds_sock *rs = NULL; |
| 585 | struct rds_message *rm; |
| 586 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 587 | while (!list_empty(messages)) { |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 588 | int was_on_sock = 0; |
| 589 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 590 | rm = list_entry(messages->next, struct rds_message, |
| 591 | m_conn_item); |
| 592 | list_del_init(&rm->m_conn_item); |
| 593 | |
| 594 | /* |
| 595 | * If we see this flag cleared then we're *sure* that someone |
| 596 | * else beat us to removing it from the sock. If we race |
| 597 | * with their flag update we'll get the lock and then really |
| 598 | * see that the flag has been cleared. |
| 599 | * |
| 600 | * The message spinlock makes sure nobody clears rm->m_rs |
| 601 | * while we're messing with it. It does not prevent the |
| 602 | * message from being removed from the socket, though. |
| 603 | */ |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 604 | spin_lock_irqsave(&rm->m_rs_lock, flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 605 | if (!test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) |
| 606 | goto unlock_and_drop; |
| 607 | |
| 608 | if (rs != rm->m_rs) { |
| 609 | if (rs) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 610 | rds_wake_sk_sleep(rs); |
| 611 | sock_put(rds_rs_to_sk(rs)); |
| 612 | } |
| 613 | rs = rm->m_rs; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 614 | sock_hold(rds_rs_to_sk(rs)); |
| 615 | } |
Tina Yang | 048c15e | 2010-03-11 13:50:00 +0000 | [diff] [blame] | 616 | spin_lock(&rs->rs_lock); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 617 | |
| 618 | if (test_and_clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) { |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 619 | struct rm_rdma_op *ro = &rm->rdma; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 620 | struct rds_notifier *notifier; |
| 621 | |
| 622 | list_del_init(&rm->m_sock_item); |
| 623 | rds_send_sndbuf_remove(rs, rm); |
| 624 | |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 625 | if (ro->op_active && ro->op_notifier && |
| 626 | (ro->op_notify || (ro->op_recverr && status))) { |
| 627 | notifier = ro->op_notifier; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 628 | list_add_tail(¬ifier->n_list, |
| 629 | &rs->rs_notify_queue); |
| 630 | if (!notifier->n_status) |
| 631 | notifier->n_status = status; |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 632 | rm->rdma.op_notifier = NULL; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 633 | } |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 634 | was_on_sock = 1; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 635 | rm->m_rs = NULL; |
| 636 | } |
Tina Yang | 048c15e | 2010-03-11 13:50:00 +0000 | [diff] [blame] | 637 | spin_unlock(&rs->rs_lock); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 638 | |
| 639 | unlock_and_drop: |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 640 | spin_unlock_irqrestore(&rm->m_rs_lock, flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 641 | rds_message_put(rm); |
Andy Grover | 561c7df | 2010-03-11 13:50:06 +0000 | [diff] [blame] | 642 | if (was_on_sock) |
| 643 | rds_message_put(rm); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | if (rs) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 647 | rds_wake_sk_sleep(rs); |
| 648 | sock_put(rds_rs_to_sk(rs)); |
| 649 | } |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | /* |
| 653 | * Transports call here when they've determined that the receiver queued |
| 654 | * messages up to, and including, the given sequence number. Messages are |
| 655 | * moved to the retrans queue when rds_send_xmit picks them off the send |
| 656 | * queue. This means that in the TCP case, the message may not have been |
| 657 | * assigned the m_ack_seq yet - but that's fine as long as tcp_is_acked |
| 658 | * checks the RDS_MSG_HAS_ACK_SEQ bit. |
| 659 | * |
| 660 | * XXX It's not clear to me how this is safely serialized with socket |
| 661 | * destruction. Maybe it should bail if it sees SOCK_DEAD. |
| 662 | */ |
| 663 | void rds_send_drop_acked(struct rds_connection *conn, u64 ack, |
| 664 | is_acked_func is_acked) |
| 665 | { |
| 666 | struct rds_message *rm, *tmp; |
| 667 | unsigned long flags; |
| 668 | LIST_HEAD(list); |
| 669 | |
| 670 | spin_lock_irqsave(&conn->c_lock, flags); |
| 671 | |
| 672 | list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) { |
| 673 | if (!rds_send_is_acked(rm, ack, is_acked)) |
| 674 | break; |
| 675 | |
| 676 | list_move(&rm->m_conn_item, &list); |
| 677 | clear_bit(RDS_MSG_ON_CONN, &rm->m_flags); |
| 678 | } |
| 679 | |
| 680 | /* order flag updates with spin locks */ |
| 681 | if (!list_empty(&list)) |
| 682 | smp_mb__after_clear_bit(); |
| 683 | |
| 684 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 685 | |
| 686 | /* now remove the messages from the sock list as needed */ |
| 687 | rds_send_remove_from_sock(&list, RDS_RDMA_SUCCESS); |
| 688 | } |
Andy Grover | 616b757 | 2009-08-21 12:28:32 +0000 | [diff] [blame] | 689 | EXPORT_SYMBOL_GPL(rds_send_drop_acked); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 690 | |
| 691 | void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest) |
| 692 | { |
| 693 | struct rds_message *rm, *tmp; |
| 694 | struct rds_connection *conn; |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 695 | unsigned long flags; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 696 | LIST_HEAD(list); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 697 | |
| 698 | /* get all the messages we're dropping under the rs lock */ |
| 699 | spin_lock_irqsave(&rs->rs_lock, flags); |
| 700 | |
| 701 | list_for_each_entry_safe(rm, tmp, &rs->rs_send_queue, m_sock_item) { |
| 702 | if (dest && (dest->sin_addr.s_addr != rm->m_daddr || |
| 703 | dest->sin_port != rm->m_inc.i_hdr.h_dport)) |
| 704 | continue; |
| 705 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 706 | list_move(&rm->m_sock_item, &list); |
| 707 | rds_send_sndbuf_remove(rs, rm); |
| 708 | clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | /* order flag updates with the rs lock */ |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 712 | smp_mb__after_clear_bit(); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 713 | |
| 714 | spin_unlock_irqrestore(&rs->rs_lock, flags); |
| 715 | |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 716 | if (list_empty(&list)) |
| 717 | return; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 718 | |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 719 | /* Remove the messages from the conn */ |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 720 | list_for_each_entry(rm, &list, m_sock_item) { |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 721 | |
| 722 | conn = rm->m_inc.i_conn; |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 723 | |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 724 | spin_lock_irqsave(&conn->c_lock, flags); |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 725 | /* |
| 726 | * Maybe someone else beat us to removing rm from the conn. |
| 727 | * If we race with their flag update we'll get the lock and |
| 728 | * then really see that the flag has been cleared. |
| 729 | */ |
| 730 | if (!test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags)) { |
| 731 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 732 | continue; |
| 733 | } |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 734 | list_del_init(&rm->m_conn_item); |
| 735 | spin_unlock_irqrestore(&conn->c_lock, flags); |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 736 | |
| 737 | /* |
| 738 | * Couldn't grab m_rs_lock in top loop (lock ordering), |
| 739 | * but we can now. |
| 740 | */ |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 741 | spin_lock_irqsave(&rm->m_rs_lock, flags); |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 742 | |
Tina Yang | 550a800 | 2010-03-11 13:50:03 +0000 | [diff] [blame] | 743 | spin_lock(&rs->rs_lock); |
Andy Grover | 940786e | 2010-02-19 18:04:58 -0800 | [diff] [blame^] | 744 | __rds_send_complete(rs, rm, RDS_RDMA_CANCELED); |
Tina Yang | 550a800 | 2010-03-11 13:50:03 +0000 | [diff] [blame] | 745 | spin_unlock(&rs->rs_lock); |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 746 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 747 | rm->m_rs = NULL; |
Andy Grover | 9de0864 | 2010-03-29 16:50:54 -0700 | [diff] [blame] | 748 | spin_unlock_irqrestore(&rm->m_rs_lock, flags); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 749 | |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 750 | rds_message_put(rm); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 751 | } |
| 752 | |
Andy Grover | 7c82eaf | 2010-02-19 18:01:41 -0800 | [diff] [blame] | 753 | rds_wake_sk_sleep(rs); |
Tina Yang | 550a800 | 2010-03-11 13:50:03 +0000 | [diff] [blame] | 754 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 755 | while (!list_empty(&list)) { |
| 756 | rm = list_entry(list.next, struct rds_message, m_sock_item); |
| 757 | list_del_init(&rm->m_sock_item); |
| 758 | |
| 759 | rds_message_wait(rm); |
| 760 | rds_message_put(rm); |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | * we only want this to fire once so we use the callers 'queued'. It's |
| 766 | * possible that another thread can race with us and remove the |
| 767 | * message from the flow with RDS_CANCEL_SENT_TO. |
| 768 | */ |
| 769 | static int rds_send_queue_rm(struct rds_sock *rs, struct rds_connection *conn, |
| 770 | struct rds_message *rm, __be16 sport, |
| 771 | __be16 dport, int *queued) |
| 772 | { |
| 773 | unsigned long flags; |
| 774 | u32 len; |
| 775 | |
| 776 | if (*queued) |
| 777 | goto out; |
| 778 | |
| 779 | len = be32_to_cpu(rm->m_inc.i_hdr.h_len); |
| 780 | |
| 781 | /* this is the only place which holds both the socket's rs_lock |
| 782 | * and the connection's c_lock */ |
| 783 | spin_lock_irqsave(&rs->rs_lock, flags); |
| 784 | |
| 785 | /* |
| 786 | * If there is a little space in sndbuf, we don't queue anything, |
| 787 | * and userspace gets -EAGAIN. But poll() indicates there's send |
| 788 | * room. This can lead to bad behavior (spinning) if snd_bytes isn't |
| 789 | * freed up by incoming acks. So we check the *old* value of |
| 790 | * rs_snd_bytes here to allow the last msg to exceed the buffer, |
| 791 | * and poll() now knows no more data can be sent. |
| 792 | */ |
| 793 | if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) { |
| 794 | rs->rs_snd_bytes += len; |
| 795 | |
| 796 | /* let recv side know we are close to send space exhaustion. |
| 797 | * This is probably not the optimal way to do it, as this |
| 798 | * means we set the flag on *all* messages as soon as our |
| 799 | * throughput hits a certain threshold. |
| 800 | */ |
| 801 | if (rs->rs_snd_bytes >= rds_sk_sndbuf(rs) / 2) |
| 802 | __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags); |
| 803 | |
| 804 | list_add_tail(&rm->m_sock_item, &rs->rs_send_queue); |
| 805 | set_bit(RDS_MSG_ON_SOCK, &rm->m_flags); |
| 806 | rds_message_addref(rm); |
| 807 | rm->m_rs = rs; |
| 808 | |
| 809 | /* The code ordering is a little weird, but we're |
| 810 | trying to minimize the time we hold c_lock */ |
| 811 | rds_message_populate_header(&rm->m_inc.i_hdr, sport, dport, 0); |
| 812 | rm->m_inc.i_conn = conn; |
| 813 | rds_message_addref(rm); |
| 814 | |
| 815 | spin_lock(&conn->c_lock); |
| 816 | rm->m_inc.i_hdr.h_sequence = cpu_to_be64(conn->c_next_tx_seq++); |
| 817 | list_add_tail(&rm->m_conn_item, &conn->c_send_queue); |
| 818 | set_bit(RDS_MSG_ON_CONN, &rm->m_flags); |
| 819 | spin_unlock(&conn->c_lock); |
| 820 | |
| 821 | rdsdebug("queued msg %p len %d, rs %p bytes %d seq %llu\n", |
| 822 | rm, len, rs, rs->rs_snd_bytes, |
| 823 | (unsigned long long)be64_to_cpu(rm->m_inc.i_hdr.h_sequence)); |
| 824 | |
| 825 | *queued = 1; |
| 826 | } |
| 827 | |
| 828 | spin_unlock_irqrestore(&rs->rs_lock, flags); |
| 829 | out: |
| 830 | return *queued; |
| 831 | } |
| 832 | |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 833 | /* |
| 834 | * rds_message is getting to be quite complicated, and we'd like to allocate |
| 835 | * it all in one go. This figures out how big it needs to be up front. |
| 836 | */ |
| 837 | static int rds_rm_size(struct msghdr *msg, int data_len) |
| 838 | { |
Andy Grover | ff87e97 | 2010-01-12 14:13:15 -0800 | [diff] [blame] | 839 | struct cmsghdr *cmsg; |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 840 | int size = 0; |
Andy Grover | ff87e97 | 2010-01-12 14:13:15 -0800 | [diff] [blame] | 841 | int retval; |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 842 | |
Andy Grover | ff87e97 | 2010-01-12 14:13:15 -0800 | [diff] [blame] | 843 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| 844 | if (!CMSG_OK(msg, cmsg)) |
| 845 | return -EINVAL; |
| 846 | |
| 847 | if (cmsg->cmsg_level != SOL_RDS) |
| 848 | continue; |
| 849 | |
| 850 | switch (cmsg->cmsg_type) { |
| 851 | case RDS_CMSG_RDMA_ARGS: |
| 852 | retval = rds_rdma_extra_size(CMSG_DATA(cmsg)); |
| 853 | if (retval < 0) |
| 854 | return retval; |
| 855 | size += retval; |
| 856 | break; |
| 857 | |
| 858 | case RDS_CMSG_RDMA_DEST: |
| 859 | case RDS_CMSG_RDMA_MAP: |
| 860 | /* these are valid but do no add any size */ |
| 861 | break; |
| 862 | |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 863 | case RDS_CMSG_ATOMIC_CSWP: |
| 864 | case RDS_CMSG_ATOMIC_FADD: |
| 865 | size += sizeof(struct scatterlist); |
| 866 | break; |
| 867 | |
Andy Grover | ff87e97 | 2010-01-12 14:13:15 -0800 | [diff] [blame] | 868 | default: |
| 869 | return -EINVAL; |
| 870 | } |
| 871 | |
| 872 | } |
| 873 | |
| 874 | size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist); |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 875 | |
| 876 | return size; |
| 877 | } |
| 878 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 879 | static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm, |
| 880 | struct msghdr *msg, int *allocated_mr) |
| 881 | { |
| 882 | struct cmsghdr *cmsg; |
| 883 | int ret = 0; |
| 884 | |
| 885 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| 886 | if (!CMSG_OK(msg, cmsg)) |
| 887 | return -EINVAL; |
| 888 | |
| 889 | if (cmsg->cmsg_level != SOL_RDS) |
| 890 | continue; |
| 891 | |
| 892 | /* As a side effect, RDMA_DEST and RDMA_MAP will set |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 893 | * rm->rdma.m_rdma_cookie and rm->rdma.m_rdma_mr. |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 894 | */ |
| 895 | switch (cmsg->cmsg_type) { |
| 896 | case RDS_CMSG_RDMA_ARGS: |
| 897 | ret = rds_cmsg_rdma_args(rs, rm, cmsg); |
| 898 | break; |
| 899 | |
| 900 | case RDS_CMSG_RDMA_DEST: |
| 901 | ret = rds_cmsg_rdma_dest(rs, rm, cmsg); |
| 902 | break; |
| 903 | |
| 904 | case RDS_CMSG_RDMA_MAP: |
| 905 | ret = rds_cmsg_rdma_map(rs, rm, cmsg); |
| 906 | if (!ret) |
| 907 | *allocated_mr = 1; |
| 908 | break; |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 909 | case RDS_CMSG_ATOMIC_CSWP: |
| 910 | case RDS_CMSG_ATOMIC_FADD: |
| 911 | ret = rds_cmsg_atomic(rs, rm, cmsg); |
| 912 | break; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 913 | |
| 914 | default: |
| 915 | return -EINVAL; |
| 916 | } |
| 917 | |
| 918 | if (ret) |
| 919 | break; |
| 920 | } |
| 921 | |
| 922 | return ret; |
| 923 | } |
| 924 | |
| 925 | int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
| 926 | size_t payload_len) |
| 927 | { |
| 928 | struct sock *sk = sock->sk; |
| 929 | struct rds_sock *rs = rds_sk_to_rs(sk); |
| 930 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
| 931 | __be32 daddr; |
| 932 | __be16 dport; |
| 933 | struct rds_message *rm = NULL; |
| 934 | struct rds_connection *conn; |
| 935 | int ret = 0; |
| 936 | int queued = 0, allocated_mr = 0; |
| 937 | int nonblock = msg->msg_flags & MSG_DONTWAIT; |
Andy Grover | 1123fd7 | 2010-03-11 13:49:56 +0000 | [diff] [blame] | 938 | long timeo = sock_sndtimeo(sk, nonblock); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 939 | |
| 940 | /* Mirror Linux UDP mirror of BSD error message compatibility */ |
| 941 | /* XXX: Perhaps MSG_MORE someday */ |
| 942 | if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT)) { |
| 943 | printk(KERN_INFO "msg_flags 0x%08X\n", msg->msg_flags); |
| 944 | ret = -EOPNOTSUPP; |
| 945 | goto out; |
| 946 | } |
| 947 | |
| 948 | if (msg->msg_namelen) { |
| 949 | /* XXX fail non-unicast destination IPs? */ |
| 950 | if (msg->msg_namelen < sizeof(*usin) || usin->sin_family != AF_INET) { |
| 951 | ret = -EINVAL; |
| 952 | goto out; |
| 953 | } |
| 954 | daddr = usin->sin_addr.s_addr; |
| 955 | dport = usin->sin_port; |
| 956 | } else { |
| 957 | /* We only care about consistency with ->connect() */ |
| 958 | lock_sock(sk); |
| 959 | daddr = rs->rs_conn_addr; |
| 960 | dport = rs->rs_conn_port; |
| 961 | release_sock(sk); |
| 962 | } |
| 963 | |
| 964 | /* racing with another thread binding seems ok here */ |
| 965 | if (daddr == 0 || rs->rs_bound_addr == 0) { |
| 966 | ret = -ENOTCONN; /* XXX not a great errno */ |
| 967 | goto out; |
| 968 | } |
| 969 | |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 970 | /* size of rm including all sgs */ |
| 971 | ret = rds_rm_size(msg, payload_len); |
| 972 | if (ret < 0) |
| 973 | goto out; |
| 974 | |
| 975 | rm = rds_message_alloc(ret, GFP_KERNEL); |
| 976 | if (!rm) { |
| 977 | ret = -ENOMEM; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 978 | goto out; |
| 979 | } |
| 980 | |
Andy Grover | 372cd7d | 2010-02-03 19:40:32 -0800 | [diff] [blame] | 981 | /* Attach data to the rm */ |
| 982 | if (payload_len) { |
| 983 | rm->data.op_sg = rds_message_alloc_sgs(rm, ceil(payload_len, PAGE_SIZE)); |
| 984 | ret = rds_message_copy_from_user(rm, msg->msg_iov, payload_len); |
| 985 | if (ret) |
| 986 | goto out; |
| 987 | } |
| 988 | rm->data.op_active = 1; |
Andy Grover | fc44508 | 2010-01-12 12:56:06 -0800 | [diff] [blame] | 989 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 990 | rm->m_daddr = daddr; |
| 991 | |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 992 | /* rds_conn_create has a spinlock that runs with IRQ off. |
| 993 | * Caching the conn in the socket helps a lot. */ |
| 994 | if (rs->rs_conn && rs->rs_conn->c_faddr == daddr) |
| 995 | conn = rs->rs_conn; |
| 996 | else { |
| 997 | conn = rds_conn_create_outgoing(rs->rs_bound_addr, daddr, |
| 998 | rs->rs_transport, |
| 999 | sock->sk->sk_allocation); |
| 1000 | if (IS_ERR(conn)) { |
| 1001 | ret = PTR_ERR(conn); |
| 1002 | goto out; |
| 1003 | } |
| 1004 | rs->rs_conn = conn; |
| 1005 | } |
| 1006 | |
Andy Grover | 49f6969 | 2009-04-09 14:09:41 +0000 | [diff] [blame] | 1007 | /* Parse any control messages the user may have included. */ |
| 1008 | ret = rds_cmsg_send(rs, rm, msg, &allocated_mr); |
| 1009 | if (ret) |
| 1010 | goto out; |
| 1011 | |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 1012 | if ((rm->m_rdma_cookie || rm->rdma.op_active) && |
| 1013 | !conn->c_trans->xmit_rdma) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1014 | if (printk_ratelimit()) |
| 1015 | printk(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n", |
Andy Grover | f8b3aaf | 2010-03-01 14:11:53 -0800 | [diff] [blame] | 1016 | &rm->rdma, conn->c_trans->xmit_rdma); |
Andy Grover | 15133f6 | 2010-01-12 14:33:38 -0800 | [diff] [blame] | 1017 | ret = -EOPNOTSUPP; |
| 1018 | goto out; |
| 1019 | } |
| 1020 | |
| 1021 | if (rm->atomic.op_active && !conn->c_trans->xmit_atomic) { |
| 1022 | if (printk_ratelimit()) |
| 1023 | printk(KERN_NOTICE "atomic_op %p conn xmit_atomic %p\n", |
| 1024 | &rm->atomic, conn->c_trans->xmit_atomic); |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1025 | ret = -EOPNOTSUPP; |
| 1026 | goto out; |
| 1027 | } |
| 1028 | |
| 1029 | /* If the connection is down, trigger a connect. We may |
| 1030 | * have scheduled a delayed reconnect however - in this case |
| 1031 | * we should not interfere. |
| 1032 | */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1033 | if (rds_conn_state(conn) == RDS_CONN_DOWN && |
| 1034 | !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags)) |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1035 | queue_delayed_work(rds_wq, &conn->c_conn_w, 0); |
| 1036 | |
| 1037 | ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs); |
Andy Grover | b98ba52 | 2010-03-11 13:50:04 +0000 | [diff] [blame] | 1038 | if (ret) { |
| 1039 | rs->rs_seen_congestion = 1; |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1040 | goto out; |
Andy Grover | b98ba52 | 2010-03-11 13:50:04 +0000 | [diff] [blame] | 1041 | } |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1042 | |
| 1043 | while (!rds_send_queue_rm(rs, conn, rm, rs->rs_bound_port, |
| 1044 | dport, &queued)) { |
| 1045 | rds_stats_inc(s_send_queue_full); |
| 1046 | /* XXX make sure this is reasonable */ |
| 1047 | if (payload_len > rds_sk_sndbuf(rs)) { |
| 1048 | ret = -EMSGSIZE; |
| 1049 | goto out; |
| 1050 | } |
| 1051 | if (nonblock) { |
| 1052 | ret = -EAGAIN; |
| 1053 | goto out; |
| 1054 | } |
| 1055 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1056 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1057 | rds_send_queue_rm(rs, conn, rm, |
| 1058 | rs->rs_bound_port, |
| 1059 | dport, |
| 1060 | &queued), |
| 1061 | timeo); |
| 1062 | rdsdebug("sendmsg woke queued %d timeo %ld\n", queued, timeo); |
| 1063 | if (timeo > 0 || timeo == MAX_SCHEDULE_TIMEOUT) |
| 1064 | continue; |
| 1065 | |
| 1066 | ret = timeo; |
| 1067 | if (ret == 0) |
| 1068 | ret = -ETIMEDOUT; |
| 1069 | goto out; |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * By now we've committed to the send. We reuse rds_send_worker() |
| 1074 | * to retry sends in the rds thread if the transport asks us to. |
| 1075 | */ |
| 1076 | rds_stats_inc(s_send_queued); |
| 1077 | |
| 1078 | if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags)) |
| 1079 | rds_send_worker(&conn->c_send_w.work); |
| 1080 | |
| 1081 | rds_message_put(rm); |
| 1082 | return payload_len; |
| 1083 | |
| 1084 | out: |
| 1085 | /* If the user included a RDMA_MAP cmsg, we allocated a MR on the fly. |
| 1086 | * If the sendmsg goes through, we keep the MR. If it fails with EAGAIN |
| 1087 | * or in any other way, we need to destroy the MR again */ |
| 1088 | if (allocated_mr) |
| 1089 | rds_rdma_unuse(rs, rds_rdma_cookie_key(rm->m_rdma_cookie), 1); |
| 1090 | |
| 1091 | if (rm) |
| 1092 | rds_message_put(rm); |
| 1093 | return ret; |
| 1094 | } |
| 1095 | |
| 1096 | /* |
| 1097 | * Reply to a ping packet. |
| 1098 | */ |
| 1099 | int |
| 1100 | rds_send_pong(struct rds_connection *conn, __be16 dport) |
| 1101 | { |
| 1102 | struct rds_message *rm; |
| 1103 | unsigned long flags; |
| 1104 | int ret = 0; |
| 1105 | |
| 1106 | rm = rds_message_alloc(0, GFP_ATOMIC); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 1107 | if (!rm) { |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1108 | ret = -ENOMEM; |
| 1109 | goto out; |
| 1110 | } |
| 1111 | |
| 1112 | rm->m_daddr = conn->c_faddr; |
| 1113 | |
| 1114 | /* If the connection is down, trigger a connect. We may |
| 1115 | * have scheduled a delayed reconnect however - in this case |
| 1116 | * we should not interfere. |
| 1117 | */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1118 | if (rds_conn_state(conn) == RDS_CONN_DOWN && |
| 1119 | !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags)) |
Andy Grover | 5c11559 | 2009-02-24 15:30:27 +0000 | [diff] [blame] | 1120 | queue_delayed_work(rds_wq, &conn->c_conn_w, 0); |
| 1121 | |
| 1122 | ret = rds_cong_wait(conn->c_fcong, dport, 1, NULL); |
| 1123 | if (ret) |
| 1124 | goto out; |
| 1125 | |
| 1126 | spin_lock_irqsave(&conn->c_lock, flags); |
| 1127 | list_add_tail(&rm->m_conn_item, &conn->c_send_queue); |
| 1128 | set_bit(RDS_MSG_ON_CONN, &rm->m_flags); |
| 1129 | rds_message_addref(rm); |
| 1130 | rm->m_inc.i_conn = conn; |
| 1131 | |
| 1132 | rds_message_populate_header(&rm->m_inc.i_hdr, 0, dport, |
| 1133 | conn->c_next_tx_seq); |
| 1134 | conn->c_next_tx_seq++; |
| 1135 | spin_unlock_irqrestore(&conn->c_lock, flags); |
| 1136 | |
| 1137 | rds_stats_inc(s_send_queued); |
| 1138 | rds_stats_inc(s_send_pong); |
| 1139 | |
| 1140 | queue_delayed_work(rds_wq, &conn->c_send_w, 0); |
| 1141 | rds_message_put(rm); |
| 1142 | return 0; |
| 1143 | |
| 1144 | out: |
| 1145 | if (rm) |
| 1146 | rds_message_put(rm); |
| 1147 | return ret; |
| 1148 | } |