Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005-2007 Network Appliance, Inc. 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 BSD-type |
| 8 | * license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * |
| 14 | * Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * |
| 17 | * Redistributions in binary form must reproduce the above |
| 18 | * copyright notice, this list of conditions and the following |
| 19 | * disclaimer in the documentation and/or other materials provided |
| 20 | * with the distribution. |
| 21 | * |
| 22 | * Neither the name of the Network Appliance, Inc. nor the names of |
| 23 | * its contributors may be used to endorse or promote products |
| 24 | * derived from this software without specific prior written |
| 25 | * permission. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 38 | * |
| 39 | * Author: Tom Tucker <tom@opengridcomputing.com> |
| 40 | */ |
| 41 | |
| 42 | #include <linux/sunrpc/svc_xprt.h> |
| 43 | #include <linux/sunrpc/debug.h> |
| 44 | #include <linux/sunrpc/rpc_rdma.h> |
| 45 | #include <linux/spinlock.h> |
| 46 | #include <rdma/ib_verbs.h> |
| 47 | #include <rdma/rdma_cm.h> |
| 48 | #include <linux/sunrpc/svc_rdma.h> |
| 49 | |
| 50 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
| 51 | |
| 52 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, |
| 53 | struct sockaddr *sa, int salen, |
| 54 | int flags); |
| 55 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); |
| 56 | static void svc_rdma_release_rqst(struct svc_rqst *); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 57 | static void dto_tasklet_func(unsigned long data); |
| 58 | static void svc_rdma_detach(struct svc_xprt *xprt); |
| 59 | static void svc_rdma_free(struct svc_xprt *xprt); |
| 60 | static int svc_rdma_has_wspace(struct svc_xprt *xprt); |
| 61 | static void rq_cq_reap(struct svcxprt_rdma *xprt); |
| 62 | static void sq_cq_reap(struct svcxprt_rdma *xprt); |
| 63 | |
| 64 | DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL); |
| 65 | static DEFINE_SPINLOCK(dto_lock); |
| 66 | static LIST_HEAD(dto_xprt_q); |
| 67 | |
| 68 | static struct svc_xprt_ops svc_rdma_ops = { |
| 69 | .xpo_create = svc_rdma_create, |
| 70 | .xpo_recvfrom = svc_rdma_recvfrom, |
| 71 | .xpo_sendto = svc_rdma_sendto, |
| 72 | .xpo_release_rqst = svc_rdma_release_rqst, |
| 73 | .xpo_detach = svc_rdma_detach, |
| 74 | .xpo_free = svc_rdma_free, |
| 75 | .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, |
| 76 | .xpo_has_wspace = svc_rdma_has_wspace, |
| 77 | .xpo_accept = svc_rdma_accept, |
| 78 | }; |
| 79 | |
| 80 | struct svc_xprt_class svc_rdma_class = { |
| 81 | .xcl_name = "rdma", |
| 82 | .xcl_owner = THIS_MODULE, |
| 83 | .xcl_ops = &svc_rdma_ops, |
| 84 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| 85 | }; |
| 86 | |
Tom Tucker | 8948896 | 2008-05-28 15:14:02 -0500 | [diff] [blame^] | 87 | /* WR context cache. Created in svc_rdma.c */ |
| 88 | extern struct kmem_cache *svc_rdma_ctxt_cachep; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 89 | |
| 90 | struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) |
| 91 | { |
| 92 | struct svc_rdma_op_ctxt *ctxt; |
| 93 | |
| 94 | while (1) { |
Tom Tucker | 8948896 | 2008-05-28 15:14:02 -0500 | [diff] [blame^] | 95 | ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL); |
| 96 | if (ctxt) |
| 97 | break; |
| 98 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 99 | } |
Tom Tucker | 8948896 | 2008-05-28 15:14:02 -0500 | [diff] [blame^] | 100 | ctxt->xprt = xprt; |
| 101 | INIT_LIST_HEAD(&ctxt->dto_q); |
| 102 | ctxt->count = 0; |
| 103 | atomic_inc(&xprt->sc_ctxt_used); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 104 | return ctxt; |
| 105 | } |
| 106 | |
Tom Tucker | e6ab914 | 2008-05-28 12:08:48 -0500 | [diff] [blame] | 107 | static void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt) |
| 108 | { |
| 109 | struct svcxprt_rdma *xprt = ctxt->xprt; |
| 110 | int i; |
| 111 | for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) { |
Tom Tucker | 87295b6 | 2008-05-28 13:17:44 -0500 | [diff] [blame] | 112 | atomic_dec(&xprt->sc_dma_used); |
Tom Tucker | e6ab914 | 2008-05-28 12:08:48 -0500 | [diff] [blame] | 113 | ib_dma_unmap_single(xprt->sc_cm_id->device, |
| 114 | ctxt->sge[i].addr, |
| 115 | ctxt->sge[i].length, |
| 116 | ctxt->direction); |
| 117 | } |
| 118 | } |
| 119 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 120 | void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages) |
| 121 | { |
| 122 | struct svcxprt_rdma *xprt; |
| 123 | int i; |
| 124 | |
| 125 | BUG_ON(!ctxt); |
| 126 | xprt = ctxt->xprt; |
| 127 | if (free_pages) |
| 128 | for (i = 0; i < ctxt->count; i++) |
| 129 | put_page(ctxt->pages[i]); |
| 130 | |
Tom Tucker | 8948896 | 2008-05-28 15:14:02 -0500 | [diff] [blame^] | 131 | kmem_cache_free(svc_rdma_ctxt_cachep, ctxt); |
Tom Tucker | 8740767 | 2008-04-30 20:44:39 -0500 | [diff] [blame] | 132 | atomic_dec(&xprt->sc_ctxt_used); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 133 | } |
| 134 | |
Tom Tucker | ab96ddd | 2008-05-28 13:54:04 -0500 | [diff] [blame] | 135 | /* Temporary NFS request map cache. Created in svc_rdma.c */ |
| 136 | extern struct kmem_cache *svc_rdma_map_cachep; |
| 137 | |
| 138 | /* |
| 139 | * Temporary NFS req mappings are shared across all transport |
| 140 | * instances. These are short lived and should be bounded by the number |
| 141 | * of concurrent server threads * depth of the SQ. |
| 142 | */ |
| 143 | struct svc_rdma_req_map *svc_rdma_get_req_map(void) |
| 144 | { |
| 145 | struct svc_rdma_req_map *map; |
| 146 | while (1) { |
| 147 | map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL); |
| 148 | if (map) |
| 149 | break; |
| 150 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); |
| 151 | } |
| 152 | map->count = 0; |
| 153 | return map; |
| 154 | } |
| 155 | |
| 156 | void svc_rdma_put_req_map(struct svc_rdma_req_map *map) |
| 157 | { |
| 158 | kmem_cache_free(svc_rdma_map_cachep, map); |
| 159 | } |
| 160 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 161 | /* ib_cq event handler */ |
| 162 | static void cq_event_handler(struct ib_event *event, void *context) |
| 163 | { |
| 164 | struct svc_xprt *xprt = context; |
| 165 | dprintk("svcrdma: received CQ event id=%d, context=%p\n", |
| 166 | event->event, context); |
| 167 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 168 | } |
| 169 | |
| 170 | /* QP event handler */ |
| 171 | static void qp_event_handler(struct ib_event *event, void *context) |
| 172 | { |
| 173 | struct svc_xprt *xprt = context; |
| 174 | |
| 175 | switch (event->event) { |
| 176 | /* These are considered benign events */ |
| 177 | case IB_EVENT_PATH_MIG: |
| 178 | case IB_EVENT_COMM_EST: |
| 179 | case IB_EVENT_SQ_DRAINED: |
| 180 | case IB_EVENT_QP_LAST_WQE_REACHED: |
| 181 | dprintk("svcrdma: QP event %d received for QP=%p\n", |
| 182 | event->event, event->element.qp); |
| 183 | break; |
| 184 | /* These are considered fatal events */ |
| 185 | case IB_EVENT_PATH_MIG_ERR: |
| 186 | case IB_EVENT_QP_FATAL: |
| 187 | case IB_EVENT_QP_REQ_ERR: |
| 188 | case IB_EVENT_QP_ACCESS_ERR: |
| 189 | case IB_EVENT_DEVICE_FATAL: |
| 190 | default: |
| 191 | dprintk("svcrdma: QP ERROR event %d received for QP=%p, " |
| 192 | "closing transport\n", |
| 193 | event->event, event->element.qp); |
| 194 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 195 | break; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Data Transfer Operation Tasklet |
| 201 | * |
| 202 | * Walks a list of transports with I/O pending, removing entries as |
| 203 | * they are added to the server's I/O pending list. Two bits indicate |
| 204 | * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave |
| 205 | * spinlock that serializes access to the transport list with the RQ |
| 206 | * and SQ interrupt handlers. |
| 207 | */ |
| 208 | static void dto_tasklet_func(unsigned long data) |
| 209 | { |
| 210 | struct svcxprt_rdma *xprt; |
| 211 | unsigned long flags; |
| 212 | |
| 213 | spin_lock_irqsave(&dto_lock, flags); |
| 214 | while (!list_empty(&dto_xprt_q)) { |
| 215 | xprt = list_entry(dto_xprt_q.next, |
| 216 | struct svcxprt_rdma, sc_dto_q); |
| 217 | list_del_init(&xprt->sc_dto_q); |
| 218 | spin_unlock_irqrestore(&dto_lock, flags); |
| 219 | |
Tom Tucker | dbcd00e | 2008-05-06 11:33:11 -0500 | [diff] [blame] | 220 | rq_cq_reap(xprt); |
| 221 | sq_cq_reap(xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 222 | |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 223 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 224 | spin_lock_irqsave(&dto_lock, flags); |
| 225 | } |
| 226 | spin_unlock_irqrestore(&dto_lock, flags); |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * Receive Queue Completion Handler |
| 231 | * |
| 232 | * Since an RQ completion handler is called on interrupt context, we |
| 233 | * need to defer the handling of the I/O to a tasklet |
| 234 | */ |
| 235 | static void rq_comp_handler(struct ib_cq *cq, void *cq_context) |
| 236 | { |
| 237 | struct svcxprt_rdma *xprt = cq_context; |
| 238 | unsigned long flags; |
| 239 | |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 240 | /* Guard against unconditional flush call for destroyed QP */ |
| 241 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) |
| 242 | return; |
| 243 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 244 | /* |
| 245 | * Set the bit regardless of whether or not it's on the list |
| 246 | * because it may be on the list already due to an SQ |
| 247 | * completion. |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 248 | */ |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 249 | set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags); |
| 250 | |
| 251 | /* |
| 252 | * If this transport is not already on the DTO transport queue, |
| 253 | * add it |
| 254 | */ |
| 255 | spin_lock_irqsave(&dto_lock, flags); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 256 | if (list_empty(&xprt->sc_dto_q)) { |
| 257 | svc_xprt_get(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 258 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 259 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 260 | spin_unlock_irqrestore(&dto_lock, flags); |
| 261 | |
| 262 | /* Tasklet does all the work to avoid irqsave locks. */ |
| 263 | tasklet_schedule(&dto_tasklet); |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * rq_cq_reap - Process the RQ CQ. |
| 268 | * |
| 269 | * Take all completing WC off the CQE and enqueue the associated DTO |
| 270 | * context on the dto_q for the transport. |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 271 | * |
| 272 | * Note that caller must hold a transport reference. |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 273 | */ |
| 274 | static void rq_cq_reap(struct svcxprt_rdma *xprt) |
| 275 | { |
| 276 | int ret; |
| 277 | struct ib_wc wc; |
| 278 | struct svc_rdma_op_ctxt *ctxt = NULL; |
| 279 | |
Tom Tucker | dbcd00e | 2008-05-06 11:33:11 -0500 | [diff] [blame] | 280 | if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) |
| 281 | return; |
| 282 | |
| 283 | ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 284 | atomic_inc(&rdma_stat_rq_poll); |
| 285 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 286 | while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { |
| 287 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; |
| 288 | ctxt->wc_status = wc.status; |
| 289 | ctxt->byte_len = wc.byte_len; |
Tom Tucker | e6ab914 | 2008-05-28 12:08:48 -0500 | [diff] [blame] | 290 | svc_rdma_unmap_dma(ctxt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 291 | if (wc.status != IB_WC_SUCCESS) { |
| 292 | /* Close the transport */ |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 293 | dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 294 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| 295 | svc_rdma_put_context(ctxt, 1); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 296 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 297 | continue; |
| 298 | } |
Tom Tucker | 47698e0 | 2008-05-06 11:49:05 -0500 | [diff] [blame] | 299 | spin_lock_bh(&xprt->sc_rq_dto_lock); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 300 | list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); |
Tom Tucker | 47698e0 | 2008-05-06 11:49:05 -0500 | [diff] [blame] | 301 | spin_unlock_bh(&xprt->sc_rq_dto_lock); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 302 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 303 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 304 | |
| 305 | if (ctxt) |
| 306 | atomic_inc(&rdma_stat_rq_prod); |
Tom Tucker | dbcd00e | 2008-05-06 11:33:11 -0500 | [diff] [blame] | 307 | |
| 308 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); |
| 309 | /* |
| 310 | * If data arrived before established event, |
| 311 | * don't enqueue. This defers RPC I/O until the |
| 312 | * RDMA connection is complete. |
| 313 | */ |
| 314 | if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) |
| 315 | svc_xprt_enqueue(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Send Queue Completion Handler - potentially called on interrupt context. |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 320 | * |
| 321 | * Note that caller must hold a transport reference. |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 322 | */ |
| 323 | static void sq_cq_reap(struct svcxprt_rdma *xprt) |
| 324 | { |
| 325 | struct svc_rdma_op_ctxt *ctxt = NULL; |
| 326 | struct ib_wc wc; |
| 327 | struct ib_cq *cq = xprt->sc_sq_cq; |
| 328 | int ret; |
| 329 | |
Tom Tucker | dbcd00e | 2008-05-06 11:33:11 -0500 | [diff] [blame] | 330 | |
| 331 | if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags)) |
| 332 | return; |
| 333 | |
| 334 | ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 335 | atomic_inc(&rdma_stat_sq_poll); |
| 336 | while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) { |
| 337 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; |
| 338 | xprt = ctxt->xprt; |
| 339 | |
Tom Tucker | e6ab914 | 2008-05-28 12:08:48 -0500 | [diff] [blame] | 340 | svc_rdma_unmap_dma(ctxt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 341 | if (wc.status != IB_WC_SUCCESS) |
| 342 | /* Close the transport */ |
| 343 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| 344 | |
| 345 | /* Decrement used SQ WR count */ |
| 346 | atomic_dec(&xprt->sc_sq_count); |
| 347 | wake_up(&xprt->sc_send_wait); |
| 348 | |
| 349 | switch (ctxt->wr_op) { |
| 350 | case IB_WR_SEND: |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 351 | svc_rdma_put_context(ctxt, 1); |
| 352 | break; |
| 353 | |
Tom Tucker | 34d16e4 | 2008-07-02 14:56:13 -0500 | [diff] [blame] | 354 | case IB_WR_RDMA_WRITE: |
| 355 | svc_rdma_put_context(ctxt, 0); |
| 356 | break; |
| 357 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 358 | case IB_WR_RDMA_READ: |
| 359 | if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) { |
Tom Tucker | 02e7452 | 2008-04-30 19:50:56 -0500 | [diff] [blame] | 360 | struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr; |
| 361 | BUG_ON(!read_hdr); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 362 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 363 | spin_lock_bh(&xprt->sc_read_complete_lock); |
Tom Tucker | 02e7452 | 2008-04-30 19:50:56 -0500 | [diff] [blame] | 364 | list_add_tail(&read_hdr->dto_q, |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 365 | &xprt->sc_read_complete_q); |
| 366 | spin_unlock_bh(&xprt->sc_read_complete_lock); |
| 367 | svc_xprt_enqueue(&xprt->sc_xprt); |
| 368 | } |
Tom Tucker | 02e7452 | 2008-04-30 19:50:56 -0500 | [diff] [blame] | 369 | svc_rdma_put_context(ctxt, 0); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 370 | break; |
| 371 | |
| 372 | default: |
| 373 | printk(KERN_ERR "svcrdma: unexpected completion type, " |
| 374 | "opcode=%d, status=%d\n", |
| 375 | wc.opcode, wc.status); |
| 376 | break; |
| 377 | } |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 378 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | if (ctxt) |
| 382 | atomic_inc(&rdma_stat_sq_prod); |
| 383 | } |
| 384 | |
| 385 | static void sq_comp_handler(struct ib_cq *cq, void *cq_context) |
| 386 | { |
| 387 | struct svcxprt_rdma *xprt = cq_context; |
| 388 | unsigned long flags; |
| 389 | |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 390 | /* Guard against unconditional flush call for destroyed QP */ |
| 391 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) |
| 392 | return; |
| 393 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 394 | /* |
| 395 | * Set the bit regardless of whether or not it's on the list |
| 396 | * because it may be on the list already due to an RQ |
| 397 | * completion. |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 398 | */ |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 399 | set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags); |
| 400 | |
| 401 | /* |
| 402 | * If this transport is not already on the DTO transport queue, |
| 403 | * add it |
| 404 | */ |
| 405 | spin_lock_irqsave(&dto_lock, flags); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 406 | if (list_empty(&xprt->sc_dto_q)) { |
| 407 | svc_xprt_get(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 408 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 409 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 410 | spin_unlock_irqrestore(&dto_lock, flags); |
| 411 | |
| 412 | /* Tasklet does all the work to avoid irqsave locks. */ |
| 413 | tasklet_schedule(&dto_tasklet); |
| 414 | } |
| 415 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 416 | static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, |
| 417 | int listener) |
| 418 | { |
| 419 | struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); |
| 420 | |
| 421 | if (!cma_xprt) |
| 422 | return NULL; |
| 423 | svc_xprt_init(&svc_rdma_class, &cma_xprt->sc_xprt, serv); |
| 424 | INIT_LIST_HEAD(&cma_xprt->sc_accept_q); |
| 425 | INIT_LIST_HEAD(&cma_xprt->sc_dto_q); |
| 426 | INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); |
| 427 | INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); |
| 428 | init_waitqueue_head(&cma_xprt->sc_send_wait); |
| 429 | |
| 430 | spin_lock_init(&cma_xprt->sc_lock); |
| 431 | spin_lock_init(&cma_xprt->sc_read_complete_lock); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 432 | spin_lock_init(&cma_xprt->sc_rq_dto_lock); |
| 433 | |
| 434 | cma_xprt->sc_ord = svcrdma_ord; |
| 435 | |
| 436 | cma_xprt->sc_max_req_size = svcrdma_max_req_size; |
| 437 | cma_xprt->sc_max_requests = svcrdma_max_requests; |
| 438 | cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT; |
| 439 | atomic_set(&cma_xprt->sc_sq_count, 0); |
Tom Tucker | 87295b6 | 2008-05-28 13:17:44 -0500 | [diff] [blame] | 440 | atomic_set(&cma_xprt->sc_ctxt_used, 0); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 441 | |
Tom Tucker | 8948896 | 2008-05-28 15:14:02 -0500 | [diff] [blame^] | 442 | if (listener) |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 443 | set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); |
| 444 | |
| 445 | return cma_xprt; |
| 446 | } |
| 447 | |
| 448 | struct page *svc_rdma_get_page(void) |
| 449 | { |
| 450 | struct page *page; |
| 451 | |
| 452 | while ((page = alloc_page(GFP_KERNEL)) == NULL) { |
| 453 | /* If we can't get memory, wait a bit and try again */ |
| 454 | printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 " |
| 455 | "jiffies.\n"); |
| 456 | schedule_timeout_uninterruptible(msecs_to_jiffies(1000)); |
| 457 | } |
| 458 | return page; |
| 459 | } |
| 460 | |
| 461 | int svc_rdma_post_recv(struct svcxprt_rdma *xprt) |
| 462 | { |
| 463 | struct ib_recv_wr recv_wr, *bad_recv_wr; |
| 464 | struct svc_rdma_op_ctxt *ctxt; |
| 465 | struct page *page; |
| 466 | unsigned long pa; |
| 467 | int sge_no; |
| 468 | int buflen; |
| 469 | int ret; |
| 470 | |
| 471 | ctxt = svc_rdma_get_context(xprt); |
| 472 | buflen = 0; |
| 473 | ctxt->direction = DMA_FROM_DEVICE; |
| 474 | for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { |
| 475 | BUG_ON(sge_no >= xprt->sc_max_sge); |
| 476 | page = svc_rdma_get_page(); |
| 477 | ctxt->pages[sge_no] = page; |
Tom Tucker | 87295b6 | 2008-05-28 13:17:44 -0500 | [diff] [blame] | 478 | atomic_inc(&xprt->sc_dma_used); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 479 | pa = ib_dma_map_page(xprt->sc_cm_id->device, |
| 480 | page, 0, PAGE_SIZE, |
| 481 | DMA_FROM_DEVICE); |
| 482 | ctxt->sge[sge_no].addr = pa; |
| 483 | ctxt->sge[sge_no].length = PAGE_SIZE; |
| 484 | ctxt->sge[sge_no].lkey = xprt->sc_phys_mr->lkey; |
| 485 | buflen += PAGE_SIZE; |
| 486 | } |
| 487 | ctxt->count = sge_no; |
| 488 | recv_wr.next = NULL; |
| 489 | recv_wr.sg_list = &ctxt->sge[0]; |
| 490 | recv_wr.num_sge = ctxt->count; |
| 491 | recv_wr.wr_id = (u64)(unsigned long)ctxt; |
| 492 | |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 493 | svc_xprt_get(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 494 | ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 495 | if (ret) { |
| 496 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 05a0826 | 2008-04-25 14:11:31 -0500 | [diff] [blame] | 497 | svc_rdma_put_context(ctxt, 1); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 498 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 499 | return ret; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * This function handles the CONNECT_REQUEST event on a listening |
| 504 | * endpoint. It is passed the cma_id for the _new_ connection. The context in |
| 505 | * this cma_id is inherited from the listening cma_id and is the svc_xprt |
| 506 | * structure for the listening endpoint. |
| 507 | * |
| 508 | * This function creates a new xprt for the new connection and enqueues it on |
| 509 | * the accept queue for the listent xprt. When the listen thread is kicked, it |
| 510 | * will call the recvfrom method on the listen xprt which will accept the new |
| 511 | * connection. |
| 512 | */ |
Tom Tucker | 36ef25e | 2008-05-19 19:00:24 -0500 | [diff] [blame] | 513 | static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird) |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 514 | { |
| 515 | struct svcxprt_rdma *listen_xprt = new_cma_id->context; |
| 516 | struct svcxprt_rdma *newxprt; |
Tom Tucker | af261af | 2008-05-07 13:52:42 -0500 | [diff] [blame] | 517 | struct sockaddr *sa; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 518 | |
| 519 | /* Create a new transport */ |
| 520 | newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); |
| 521 | if (!newxprt) { |
| 522 | dprintk("svcrdma: failed to create new transport\n"); |
| 523 | return; |
| 524 | } |
| 525 | newxprt->sc_cm_id = new_cma_id; |
| 526 | new_cma_id->context = newxprt; |
| 527 | dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", |
| 528 | newxprt, newxprt->sc_cm_id, listen_xprt); |
| 529 | |
Tom Tucker | 36ef25e | 2008-05-19 19:00:24 -0500 | [diff] [blame] | 530 | /* Save client advertised inbound read limit for use later in accept. */ |
| 531 | newxprt->sc_ord = client_ird; |
| 532 | |
Tom Tucker | af261af | 2008-05-07 13:52:42 -0500 | [diff] [blame] | 533 | /* Set the local and remote addresses in the transport */ |
| 534 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; |
| 535 | svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); |
| 536 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; |
| 537 | svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); |
| 538 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 539 | /* |
| 540 | * Enqueue the new transport on the accept queue of the listening |
| 541 | * transport |
| 542 | */ |
| 543 | spin_lock_bh(&listen_xprt->sc_lock); |
| 544 | list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); |
| 545 | spin_unlock_bh(&listen_xprt->sc_lock); |
| 546 | |
| 547 | /* |
| 548 | * Can't use svc_xprt_received here because we are not on a |
| 549 | * rqstp thread |
| 550 | */ |
| 551 | set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); |
| 552 | svc_xprt_enqueue(&listen_xprt->sc_xprt); |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Handles events generated on the listening endpoint. These events will be |
| 557 | * either be incoming connect requests or adapter removal events. |
| 558 | */ |
| 559 | static int rdma_listen_handler(struct rdma_cm_id *cma_id, |
| 560 | struct rdma_cm_event *event) |
| 561 | { |
| 562 | struct svcxprt_rdma *xprt = cma_id->context; |
| 563 | int ret = 0; |
| 564 | |
| 565 | switch (event->event) { |
| 566 | case RDMA_CM_EVENT_CONNECT_REQUEST: |
| 567 | dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " |
| 568 | "event=%d\n", cma_id, cma_id->context, event->event); |
Tom Tucker | 36ef25e | 2008-05-19 19:00:24 -0500 | [diff] [blame] | 569 | handle_connect_req(cma_id, |
| 570 | event->param.conn.responder_resources); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 571 | break; |
| 572 | |
| 573 | case RDMA_CM_EVENT_ESTABLISHED: |
| 574 | /* Accept complete */ |
| 575 | dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " |
| 576 | "cm_id=%p\n", xprt, cma_id); |
| 577 | break; |
| 578 | |
| 579 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| 580 | dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", |
| 581 | xprt, cma_id); |
| 582 | if (xprt) |
| 583 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
| 584 | break; |
| 585 | |
| 586 | default: |
| 587 | dprintk("svcrdma: Unexpected event on listening endpoint %p, " |
| 588 | "event=%d\n", cma_id, event->event); |
| 589 | break; |
| 590 | } |
| 591 | |
| 592 | return ret; |
| 593 | } |
| 594 | |
| 595 | static int rdma_cma_handler(struct rdma_cm_id *cma_id, |
| 596 | struct rdma_cm_event *event) |
| 597 | { |
| 598 | struct svc_xprt *xprt = cma_id->context; |
| 599 | struct svcxprt_rdma *rdma = |
| 600 | container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| 601 | switch (event->event) { |
| 602 | case RDMA_CM_EVENT_ESTABLISHED: |
| 603 | /* Accept complete */ |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 604 | svc_xprt_get(xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 605 | dprintk("svcrdma: Connection completed on DTO xprt=%p, " |
| 606 | "cm_id=%p\n", xprt, cma_id); |
| 607 | clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); |
| 608 | svc_xprt_enqueue(xprt); |
| 609 | break; |
| 610 | case RDMA_CM_EVENT_DISCONNECTED: |
| 611 | dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", |
| 612 | xprt, cma_id); |
| 613 | if (xprt) { |
| 614 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 615 | svc_xprt_enqueue(xprt); |
Tom Tucker | 120693d | 2008-04-24 14:17:21 -0500 | [diff] [blame] | 616 | svc_xprt_put(xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 617 | } |
| 618 | break; |
| 619 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| 620 | dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " |
| 621 | "event=%d\n", cma_id, xprt, event->event); |
| 622 | if (xprt) { |
| 623 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 624 | svc_xprt_enqueue(xprt); |
| 625 | } |
| 626 | break; |
| 627 | default: |
| 628 | dprintk("svcrdma: Unexpected event on DTO endpoint %p, " |
| 629 | "event=%d\n", cma_id, event->event); |
| 630 | break; |
| 631 | } |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Create a listening RDMA service endpoint. |
| 637 | */ |
| 638 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, |
| 639 | struct sockaddr *sa, int salen, |
| 640 | int flags) |
| 641 | { |
| 642 | struct rdma_cm_id *listen_id; |
| 643 | struct svcxprt_rdma *cma_xprt; |
| 644 | struct svc_xprt *xprt; |
| 645 | int ret; |
| 646 | |
| 647 | dprintk("svcrdma: Creating RDMA socket\n"); |
| 648 | |
| 649 | cma_xprt = rdma_create_xprt(serv, 1); |
| 650 | if (!cma_xprt) |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 651 | return ERR_PTR(-ENOMEM); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 652 | xprt = &cma_xprt->sc_xprt; |
| 653 | |
| 654 | listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP); |
| 655 | if (IS_ERR(listen_id)) { |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 656 | ret = PTR_ERR(listen_id); |
| 657 | dprintk("svcrdma: rdma_create_id failed = %d\n", ret); |
| 658 | goto err0; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 659 | } |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 660 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 661 | ret = rdma_bind_addr(listen_id, sa); |
| 662 | if (ret) { |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 663 | dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 664 | goto err1; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 665 | } |
| 666 | cma_xprt->sc_cm_id = listen_id; |
| 667 | |
| 668 | ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); |
| 669 | if (ret) { |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 670 | dprintk("svcrdma: rdma_listen failed = %d\n", ret); |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 671 | goto err1; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 672 | } |
| 673 | |
| 674 | /* |
| 675 | * We need to use the address from the cm_id in case the |
| 676 | * caller specified 0 for the port number. |
| 677 | */ |
| 678 | sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; |
| 679 | svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); |
| 680 | |
| 681 | return &cma_xprt->sc_xprt; |
Tom Tucker | 58e8f62 | 2008-05-06 09:45:54 -0500 | [diff] [blame] | 682 | |
| 683 | err1: |
| 684 | rdma_destroy_id(listen_id); |
| 685 | err0: |
| 686 | kfree(cma_xprt); |
| 687 | return ERR_PTR(ret); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* |
| 691 | * This is the xpo_recvfrom function for listening endpoints. Its |
| 692 | * purpose is to accept incoming connections. The CMA callback handler |
| 693 | * has already created a new transport and attached it to the new CMA |
| 694 | * ID. |
| 695 | * |
| 696 | * There is a queue of pending connections hung on the listening |
| 697 | * transport. This queue contains the new svc_xprt structure. This |
| 698 | * function takes svc_xprt structures off the accept_q and completes |
| 699 | * the connection. |
| 700 | */ |
| 701 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) |
| 702 | { |
| 703 | struct svcxprt_rdma *listen_rdma; |
| 704 | struct svcxprt_rdma *newxprt = NULL; |
| 705 | struct rdma_conn_param conn_param; |
| 706 | struct ib_qp_init_attr qp_attr; |
| 707 | struct ib_device_attr devattr; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 708 | int ret; |
| 709 | int i; |
| 710 | |
| 711 | listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| 712 | clear_bit(XPT_CONN, &xprt->xpt_flags); |
| 713 | /* Get the next entry off the accept list */ |
| 714 | spin_lock_bh(&listen_rdma->sc_lock); |
| 715 | if (!list_empty(&listen_rdma->sc_accept_q)) { |
| 716 | newxprt = list_entry(listen_rdma->sc_accept_q.next, |
| 717 | struct svcxprt_rdma, sc_accept_q); |
| 718 | list_del_init(&newxprt->sc_accept_q); |
| 719 | } |
| 720 | if (!list_empty(&listen_rdma->sc_accept_q)) |
| 721 | set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); |
| 722 | spin_unlock_bh(&listen_rdma->sc_lock); |
| 723 | if (!newxprt) |
| 724 | return NULL; |
| 725 | |
| 726 | dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", |
| 727 | newxprt, newxprt->sc_cm_id); |
| 728 | |
| 729 | ret = ib_query_device(newxprt->sc_cm_id->device, &devattr); |
| 730 | if (ret) { |
| 731 | dprintk("svcrdma: could not query device attributes on " |
| 732 | "device %p, rc=%d\n", newxprt->sc_cm_id->device, ret); |
| 733 | goto errout; |
| 734 | } |
| 735 | |
| 736 | /* Qualify the transport resource defaults with the |
| 737 | * capabilities of this particular device */ |
| 738 | newxprt->sc_max_sge = min((size_t)devattr.max_sge, |
| 739 | (size_t)RPCSVC_MAXPAGES); |
| 740 | newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr, |
| 741 | (size_t)svcrdma_max_requests); |
| 742 | newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests; |
| 743 | |
Tom Tucker | 36ef25e | 2008-05-19 19:00:24 -0500 | [diff] [blame] | 744 | /* |
| 745 | * Limit ORD based on client limit, local device limit, and |
| 746 | * configured svcrdma limit. |
| 747 | */ |
| 748 | newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord); |
| 749 | newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 750 | |
| 751 | newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device); |
| 752 | if (IS_ERR(newxprt->sc_pd)) { |
| 753 | dprintk("svcrdma: error creating PD for connect request\n"); |
| 754 | goto errout; |
| 755 | } |
| 756 | newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device, |
| 757 | sq_comp_handler, |
| 758 | cq_event_handler, |
| 759 | newxprt, |
| 760 | newxprt->sc_sq_depth, |
| 761 | 0); |
| 762 | if (IS_ERR(newxprt->sc_sq_cq)) { |
| 763 | dprintk("svcrdma: error creating SQ CQ for connect request\n"); |
| 764 | goto errout; |
| 765 | } |
| 766 | newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device, |
| 767 | rq_comp_handler, |
| 768 | cq_event_handler, |
| 769 | newxprt, |
| 770 | newxprt->sc_max_requests, |
| 771 | 0); |
| 772 | if (IS_ERR(newxprt->sc_rq_cq)) { |
| 773 | dprintk("svcrdma: error creating RQ CQ for connect request\n"); |
| 774 | goto errout; |
| 775 | } |
| 776 | |
| 777 | memset(&qp_attr, 0, sizeof qp_attr); |
| 778 | qp_attr.event_handler = qp_event_handler; |
| 779 | qp_attr.qp_context = &newxprt->sc_xprt; |
| 780 | qp_attr.cap.max_send_wr = newxprt->sc_sq_depth; |
| 781 | qp_attr.cap.max_recv_wr = newxprt->sc_max_requests; |
| 782 | qp_attr.cap.max_send_sge = newxprt->sc_max_sge; |
| 783 | qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; |
| 784 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| 785 | qp_attr.qp_type = IB_QPT_RC; |
| 786 | qp_attr.send_cq = newxprt->sc_sq_cq; |
| 787 | qp_attr.recv_cq = newxprt->sc_rq_cq; |
| 788 | dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n" |
| 789 | " cm_id->device=%p, sc_pd->device=%p\n" |
| 790 | " cap.max_send_wr = %d\n" |
| 791 | " cap.max_recv_wr = %d\n" |
| 792 | " cap.max_send_sge = %d\n" |
| 793 | " cap.max_recv_sge = %d\n", |
| 794 | newxprt->sc_cm_id, newxprt->sc_pd, |
| 795 | newxprt->sc_cm_id->device, newxprt->sc_pd->device, |
| 796 | qp_attr.cap.max_send_wr, |
| 797 | qp_attr.cap.max_recv_wr, |
| 798 | qp_attr.cap.max_send_sge, |
| 799 | qp_attr.cap.max_recv_sge); |
| 800 | |
| 801 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); |
| 802 | if (ret) { |
| 803 | /* |
| 804 | * XXX: This is a hack. We need a xx_request_qp interface |
| 805 | * that will adjust the qp_attr's with a best-effort |
| 806 | * number |
| 807 | */ |
| 808 | qp_attr.cap.max_send_sge -= 2; |
| 809 | qp_attr.cap.max_recv_sge -= 2; |
| 810 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, |
| 811 | &qp_attr); |
| 812 | if (ret) { |
| 813 | dprintk("svcrdma: failed to create QP, ret=%d\n", ret); |
| 814 | goto errout; |
| 815 | } |
| 816 | newxprt->sc_max_sge = qp_attr.cap.max_send_sge; |
| 817 | newxprt->sc_max_sge = qp_attr.cap.max_recv_sge; |
| 818 | newxprt->sc_sq_depth = qp_attr.cap.max_send_wr; |
| 819 | newxprt->sc_max_requests = qp_attr.cap.max_recv_wr; |
| 820 | } |
| 821 | newxprt->sc_qp = newxprt->sc_cm_id->qp; |
| 822 | |
| 823 | /* Register all of physical memory */ |
| 824 | newxprt->sc_phys_mr = ib_get_dma_mr(newxprt->sc_pd, |
| 825 | IB_ACCESS_LOCAL_WRITE | |
| 826 | IB_ACCESS_REMOTE_WRITE); |
| 827 | if (IS_ERR(newxprt->sc_phys_mr)) { |
| 828 | dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret); |
| 829 | goto errout; |
| 830 | } |
| 831 | |
| 832 | /* Post receive buffers */ |
| 833 | for (i = 0; i < newxprt->sc_max_requests; i++) { |
| 834 | ret = svc_rdma_post_recv(newxprt); |
| 835 | if (ret) { |
| 836 | dprintk("svcrdma: failure posting receive buffers\n"); |
| 837 | goto errout; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | /* Swap out the handler */ |
| 842 | newxprt->sc_cm_id->event_handler = rdma_cma_handler; |
| 843 | |
Tom Tucker | af261af | 2008-05-07 13:52:42 -0500 | [diff] [blame] | 844 | /* |
| 845 | * Arm the CQs for the SQ and RQ before accepting so we can't |
| 846 | * miss the first message |
| 847 | */ |
| 848 | ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP); |
| 849 | ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP); |
| 850 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 851 | /* Accept Connection */ |
| 852 | set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); |
| 853 | memset(&conn_param, 0, sizeof conn_param); |
| 854 | conn_param.responder_resources = 0; |
| 855 | conn_param.initiator_depth = newxprt->sc_ord; |
| 856 | ret = rdma_accept(newxprt->sc_cm_id, &conn_param); |
| 857 | if (ret) { |
| 858 | dprintk("svcrdma: failed to accept new connection, ret=%d\n", |
| 859 | ret); |
| 860 | goto errout; |
| 861 | } |
| 862 | |
| 863 | dprintk("svcrdma: new connection %p accepted with the following " |
| 864 | "attributes:\n" |
| 865 | " local_ip : %d.%d.%d.%d\n" |
| 866 | " local_port : %d\n" |
| 867 | " remote_ip : %d.%d.%d.%d\n" |
| 868 | " remote_port : %d\n" |
| 869 | " max_sge : %d\n" |
| 870 | " sq_depth : %d\n" |
| 871 | " max_requests : %d\n" |
| 872 | " ord : %d\n", |
| 873 | newxprt, |
| 874 | NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
| 875 | route.addr.src_addr)->sin_addr.s_addr), |
| 876 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
| 877 | route.addr.src_addr)->sin_port), |
| 878 | NIPQUAD(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
| 879 | route.addr.dst_addr)->sin_addr.s_addr), |
| 880 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
| 881 | route.addr.dst_addr)->sin_port), |
| 882 | newxprt->sc_max_sge, |
| 883 | newxprt->sc_sq_depth, |
| 884 | newxprt->sc_max_requests, |
| 885 | newxprt->sc_ord); |
| 886 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 887 | return &newxprt->sc_xprt; |
| 888 | |
| 889 | errout: |
| 890 | dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 891 | /* Take a reference in case the DTO handler runs */ |
| 892 | svc_xprt_get(&newxprt->sc_xprt); |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 893 | if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 894 | ib_destroy_qp(newxprt->sc_qp); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 895 | rdma_destroy_id(newxprt->sc_cm_id); |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 896 | /* This call to put will destroy the transport */ |
| 897 | svc_xprt_put(&newxprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 898 | return NULL; |
| 899 | } |
| 900 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 901 | static void svc_rdma_release_rqst(struct svc_rqst *rqstp) |
| 902 | { |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 903 | } |
| 904 | |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 905 | /* |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 906 | * When connected, an svc_xprt has at least two references: |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 907 | * |
| 908 | * - A reference held by the cm_id between the ESTABLISHED and |
| 909 | * DISCONNECTED events. If the remote peer disconnected first, this |
| 910 | * reference could be gone. |
| 911 | * |
| 912 | * - A reference held by the svc_recv code that called this function |
| 913 | * as part of close processing. |
| 914 | * |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 915 | * At a minimum one references should still be held. |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 916 | */ |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 917 | static void svc_rdma_detach(struct svc_xprt *xprt) |
| 918 | { |
| 919 | struct svcxprt_rdma *rdma = |
| 920 | container_of(xprt, struct svcxprt_rdma, sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 921 | dprintk("svc: svc_rdma_detach(%p)\n", xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 922 | |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 923 | /* Disconnect and flush posted WQE */ |
| 924 | rdma_disconnect(rdma->sc_cm_id); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 925 | } |
| 926 | |
Tom Tucker | 8da91ea | 2008-04-30 22:00:46 -0500 | [diff] [blame] | 927 | static void __svc_rdma_free(struct work_struct *work) |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 928 | { |
Tom Tucker | 8da91ea | 2008-04-30 22:00:46 -0500 | [diff] [blame] | 929 | struct svcxprt_rdma *rdma = |
| 930 | container_of(work, struct svcxprt_rdma, sc_work); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 931 | dprintk("svcrdma: svc_rdma_free(%p)\n", rdma); |
Tom Tucker | 8da91ea | 2008-04-30 22:00:46 -0500 | [diff] [blame] | 932 | |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 933 | /* We should only be called from kref_put */ |
Tom Tucker | 8da91ea | 2008-04-30 22:00:46 -0500 | [diff] [blame] | 934 | BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0); |
| 935 | |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 936 | /* |
| 937 | * Destroy queued, but not processed read completions. Note |
| 938 | * that this cleanup has to be done before destroying the |
| 939 | * cm_id because the device ptr is needed to unmap the dma in |
| 940 | * svc_rdma_put_context. |
| 941 | */ |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 942 | while (!list_empty(&rdma->sc_read_complete_q)) { |
| 943 | struct svc_rdma_op_ctxt *ctxt; |
| 944 | ctxt = list_entry(rdma->sc_read_complete_q.next, |
| 945 | struct svc_rdma_op_ctxt, |
| 946 | dto_q); |
| 947 | list_del_init(&ctxt->dto_q); |
| 948 | svc_rdma_put_context(ctxt, 1); |
| 949 | } |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 950 | |
| 951 | /* Destroy queued, but not processed recv completions */ |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 952 | while (!list_empty(&rdma->sc_rq_dto_q)) { |
| 953 | struct svc_rdma_op_ctxt *ctxt; |
| 954 | ctxt = list_entry(rdma->sc_rq_dto_q.next, |
| 955 | struct svc_rdma_op_ctxt, |
| 956 | dto_q); |
| 957 | list_del_init(&ctxt->dto_q); |
| 958 | svc_rdma_put_context(ctxt, 1); |
| 959 | } |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 960 | |
| 961 | /* Warn if we leaked a resource or under-referenced */ |
| 962 | WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0); |
Tom Tucker | 87295b6 | 2008-05-28 13:17:44 -0500 | [diff] [blame] | 963 | WARN_ON(atomic_read(&rdma->sc_dma_used) != 0); |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 964 | |
Tom Tucker | 1711386 | 2008-05-01 11:13:50 -0500 | [diff] [blame] | 965 | /* Destroy the QP if present (not a listener) */ |
| 966 | if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) |
| 967 | ib_destroy_qp(rdma->sc_qp); |
| 968 | |
Tom Tucker | c48cbb4 | 2008-03-11 14:31:39 -0400 | [diff] [blame] | 969 | if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) |
| 970 | ib_destroy_cq(rdma->sc_sq_cq); |
| 971 | |
| 972 | if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) |
| 973 | ib_destroy_cq(rdma->sc_rq_cq); |
| 974 | |
| 975 | if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr)) |
| 976 | ib_dereg_mr(rdma->sc_phys_mr); |
| 977 | |
| 978 | if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) |
| 979 | ib_dealloc_pd(rdma->sc_pd); |
| 980 | |
Tom Tucker | 356d0a1 | 2008-05-01 11:25:02 -0500 | [diff] [blame] | 981 | /* Destroy the CM ID */ |
| 982 | rdma_destroy_id(rdma->sc_cm_id); |
| 983 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 984 | kfree(rdma); |
| 985 | } |
| 986 | |
Tom Tucker | 8da91ea | 2008-04-30 22:00:46 -0500 | [diff] [blame] | 987 | static void svc_rdma_free(struct svc_xprt *xprt) |
| 988 | { |
| 989 | struct svcxprt_rdma *rdma = |
| 990 | container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| 991 | INIT_WORK(&rdma->sc_work, __svc_rdma_free); |
| 992 | schedule_work(&rdma->sc_work); |
| 993 | } |
| 994 | |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 995 | static int svc_rdma_has_wspace(struct svc_xprt *xprt) |
| 996 | { |
| 997 | struct svcxprt_rdma *rdma = |
| 998 | container_of(xprt, struct svcxprt_rdma, sc_xprt); |
| 999 | |
| 1000 | /* |
| 1001 | * If there are fewer SQ WR available than required to send a |
| 1002 | * simple response, return false. |
| 1003 | */ |
| 1004 | if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3)) |
| 1005 | return 0; |
| 1006 | |
| 1007 | /* |
| 1008 | * ...or there are already waiters on the SQ, |
| 1009 | * return false. |
| 1010 | */ |
| 1011 | if (waitqueue_active(&rdma->sc_send_wait)) |
| 1012 | return 0; |
| 1013 | |
| 1014 | /* Otherwise return true. */ |
| 1015 | return 1; |
| 1016 | } |
| 1017 | |
| 1018 | int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) |
| 1019 | { |
| 1020 | struct ib_send_wr *bad_wr; |
| 1021 | int ret; |
| 1022 | |
| 1023 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
Tom Tucker | 9d6347a | 2008-04-25 15:51:27 -0500 | [diff] [blame] | 1024 | return -ENOTCONN; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1025 | |
| 1026 | BUG_ON(wr->send_flags != IB_SEND_SIGNALED); |
| 1027 | BUG_ON(((struct svc_rdma_op_ctxt *)(unsigned long)wr->wr_id)->wr_op != |
| 1028 | wr->opcode); |
| 1029 | /* If the SQ is full, wait until an SQ entry is available */ |
| 1030 | while (1) { |
| 1031 | spin_lock_bh(&xprt->sc_lock); |
| 1032 | if (xprt->sc_sq_depth == atomic_read(&xprt->sc_sq_count)) { |
| 1033 | spin_unlock_bh(&xprt->sc_lock); |
| 1034 | atomic_inc(&rdma_stat_sq_starve); |
Tom Tucker | dbcd00e | 2008-05-06 11:33:11 -0500 | [diff] [blame] | 1035 | |
| 1036 | /* See if we can opportunistically reap SQ WR to make room */ |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1037 | sq_cq_reap(xprt); |
| 1038 | |
| 1039 | /* Wait until SQ WR available if SQ still full */ |
| 1040 | wait_event(xprt->sc_send_wait, |
| 1041 | atomic_read(&xprt->sc_sq_count) < |
| 1042 | xprt->sc_sq_depth); |
Tom Tucker | 830bb59 | 2008-03-11 12:44:27 -0500 | [diff] [blame] | 1043 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
| 1044 | return 0; |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1045 | continue; |
| 1046 | } |
| 1047 | /* Bumped used SQ WR count and post */ |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 1048 | svc_xprt_get(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1049 | ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); |
| 1050 | if (!ret) |
| 1051 | atomic_inc(&xprt->sc_sq_count); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 1052 | else { |
| 1053 | svc_xprt_put(&xprt->sc_xprt); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1054 | dprintk("svcrdma: failed to post SQ WR rc=%d, " |
| 1055 | "sc_sq_count=%d, sc_sq_depth=%d\n", |
| 1056 | ret, atomic_read(&xprt->sc_sq_count), |
| 1057 | xprt->sc_sq_depth); |
Tom Tucker | 0905c0f | 2008-05-01 10:49:03 -0500 | [diff] [blame] | 1058 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1059 | spin_unlock_bh(&xprt->sc_lock); |
| 1060 | break; |
| 1061 | } |
| 1062 | return ret; |
| 1063 | } |
| 1064 | |
Tom Tucker | 008fdbc | 2008-05-07 15:47:42 -0500 | [diff] [blame] | 1065 | void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp, |
| 1066 | enum rpcrdma_errcode err) |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1067 | { |
| 1068 | struct ib_send_wr err_wr; |
| 1069 | struct ib_sge sge; |
| 1070 | struct page *p; |
| 1071 | struct svc_rdma_op_ctxt *ctxt; |
| 1072 | u32 *va; |
| 1073 | int length; |
| 1074 | int ret; |
| 1075 | |
| 1076 | p = svc_rdma_get_page(); |
| 1077 | va = page_address(p); |
| 1078 | |
| 1079 | /* XDR encode error */ |
| 1080 | length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va); |
| 1081 | |
| 1082 | /* Prepare SGE for local address */ |
Tom Tucker | 87295b6 | 2008-05-28 13:17:44 -0500 | [diff] [blame] | 1083 | atomic_inc(&xprt->sc_dma_used); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1084 | sge.addr = ib_dma_map_page(xprt->sc_cm_id->device, |
| 1085 | p, 0, PAGE_SIZE, DMA_FROM_DEVICE); |
| 1086 | sge.lkey = xprt->sc_phys_mr->lkey; |
| 1087 | sge.length = length; |
| 1088 | |
| 1089 | ctxt = svc_rdma_get_context(xprt); |
| 1090 | ctxt->count = 1; |
| 1091 | ctxt->pages[0] = p; |
| 1092 | |
| 1093 | /* Prepare SEND WR */ |
| 1094 | memset(&err_wr, 0, sizeof err_wr); |
| 1095 | ctxt->wr_op = IB_WR_SEND; |
| 1096 | err_wr.wr_id = (unsigned long)ctxt; |
| 1097 | err_wr.sg_list = &sge; |
| 1098 | err_wr.num_sge = 1; |
| 1099 | err_wr.opcode = IB_WR_SEND; |
| 1100 | err_wr.send_flags = IB_SEND_SIGNALED; |
| 1101 | |
| 1102 | /* Post It */ |
| 1103 | ret = svc_rdma_send(xprt, &err_wr); |
| 1104 | if (ret) { |
Tom Tucker | 008fdbc | 2008-05-07 15:47:42 -0500 | [diff] [blame] | 1105 | dprintk("svcrdma: Error %d posting send for protocol error\n", |
| 1106 | ret); |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1107 | svc_rdma_put_context(ctxt, 1); |
| 1108 | } |
Tom Tucker | 377f9b2 | 2007-12-12 16:13:21 -0600 | [diff] [blame] | 1109 | } |