| 1 | /* |
| 2 | * Copyright (c) 2003-2007 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 | |
| 40 | /* |
| 41 | * verbs.c |
| 42 | * |
| 43 | * Encapsulates the major functions managing: |
| 44 | * o adapters |
| 45 | * o endpoints |
| 46 | * o connections |
| 47 | * o buffer memory |
| 48 | */ |
| 49 | |
| 50 | #include <linux/interrupt.h> |
| 51 | #include <linux/slab.h> |
| 52 | #include <linux/prefetch.h> |
| 53 | #include <linux/sunrpc/addr.h> |
| 54 | #include <linux/sunrpc/svc_rdma.h> |
| 55 | #include <asm/bitops.h> |
| 56 | |
| 57 | #include <rdma/ib_cm.h> |
| 58 | |
| 59 | #include "xprt_rdma.h" |
| 60 | |
| 61 | /* |
| 62 | * Globals/Macros |
| 63 | */ |
| 64 | |
| 65 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
| 66 | # define RPCDBG_FACILITY RPCDBG_TRANS |
| 67 | #endif |
| 68 | |
| 69 | /* |
| 70 | * internal functions |
| 71 | */ |
| 72 | static void rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt); |
| 73 | static void rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf); |
| 74 | static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb); |
| 75 | |
| 76 | struct workqueue_struct *rpcrdma_receive_wq __read_mostly; |
| 77 | |
| 78 | int |
| 79 | rpcrdma_alloc_wq(void) |
| 80 | { |
| 81 | struct workqueue_struct *recv_wq; |
| 82 | |
| 83 | recv_wq = alloc_workqueue("xprtrdma_receive", |
| 84 | WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_HIGHPRI, |
| 85 | 0); |
| 86 | if (!recv_wq) |
| 87 | return -ENOMEM; |
| 88 | |
| 89 | rpcrdma_receive_wq = recv_wq; |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | void |
| 94 | rpcrdma_destroy_wq(void) |
| 95 | { |
| 96 | struct workqueue_struct *wq; |
| 97 | |
| 98 | if (rpcrdma_receive_wq) { |
| 99 | wq = rpcrdma_receive_wq; |
| 100 | rpcrdma_receive_wq = NULL; |
| 101 | destroy_workqueue(wq); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | static void |
| 106 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) |
| 107 | { |
| 108 | struct rpcrdma_ep *ep = context; |
| 109 | |
| 110 | pr_err("rpcrdma: %s on device %s ep %p\n", |
| 111 | ib_event_msg(event->event), event->device->name, context); |
| 112 | |
| 113 | if (ep->rep_connected == 1) { |
| 114 | ep->rep_connected = -EIO; |
| 115 | rpcrdma_conn_func(ep); |
| 116 | wake_up_all(&ep->rep_connect_wait); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC |
| 122 | * @cq: completion queue (ignored) |
| 123 | * @wc: completed WR |
| 124 | * |
| 125 | */ |
| 126 | static void |
| 127 | rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) |
| 128 | { |
| 129 | /* WARNING: Only wr_cqe and status are reliable at this point */ |
| 130 | if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR) |
| 131 | pr_err("rpcrdma: Send: %s (%u/0x%x)\n", |
| 132 | ib_wc_status_msg(wc->status), |
| 133 | wc->status, wc->vendor_err); |
| 134 | } |
| 135 | |
| 136 | /* Perform basic sanity checking to avoid using garbage |
| 137 | * to update the credit grant value. |
| 138 | */ |
| 139 | static void |
| 140 | rpcrdma_update_granted_credits(struct rpcrdma_rep *rep) |
| 141 | { |
| 142 | struct rpcrdma_buffer *buffer = &rep->rr_rxprt->rx_buf; |
| 143 | __be32 *p = rep->rr_rdmabuf->rg_base; |
| 144 | u32 credits; |
| 145 | |
| 146 | credits = be32_to_cpup(p + 2); |
| 147 | if (credits == 0) |
| 148 | credits = 1; /* don't deadlock */ |
| 149 | else if (credits > buffer->rb_max_requests) |
| 150 | credits = buffer->rb_max_requests; |
| 151 | |
| 152 | atomic_set(&buffer->rb_credits, credits); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC |
| 157 | * @cq: completion queue (ignored) |
| 158 | * @wc: completed WR |
| 159 | * |
| 160 | */ |
| 161 | static void |
| 162 | rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) |
| 163 | { |
| 164 | struct ib_cqe *cqe = wc->wr_cqe; |
| 165 | struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep, |
| 166 | rr_cqe); |
| 167 | |
| 168 | /* WARNING: Only wr_id and status are reliable at this point */ |
| 169 | if (wc->status != IB_WC_SUCCESS) |
| 170 | goto out_fail; |
| 171 | |
| 172 | /* status == SUCCESS means all fields in wc are trustworthy */ |
| 173 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
| 174 | __func__, rep, wc->byte_len); |
| 175 | |
| 176 | rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len); |
| 177 | rep->rr_wc_flags = wc->wc_flags; |
| 178 | rep->rr_inv_rkey = wc->ex.invalidate_rkey; |
| 179 | |
| 180 | ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf), |
| 181 | rdmab_addr(rep->rr_rdmabuf), |
| 182 | wc->byte_len, DMA_FROM_DEVICE); |
| 183 | |
| 184 | if (wc->byte_len >= RPCRDMA_HDRLEN_ERR) |
| 185 | rpcrdma_update_granted_credits(rep); |
| 186 | |
| 187 | out_schedule: |
| 188 | rpcrdma_reply_handler(rep); |
| 189 | return; |
| 190 | |
| 191 | out_fail: |
| 192 | if (wc->status != IB_WC_WR_FLUSH_ERR) |
| 193 | pr_err("rpcrdma: Recv: %s (%u/0x%x)\n", |
| 194 | ib_wc_status_msg(wc->status), |
| 195 | wc->status, wc->vendor_err); |
| 196 | rpcrdma_set_xdrlen(&rep->rr_hdrbuf, 0); |
| 197 | goto out_schedule; |
| 198 | } |
| 199 | |
| 200 | static void |
| 201 | rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt, |
| 202 | struct rdma_conn_param *param) |
| 203 | { |
| 204 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; |
| 205 | const struct rpcrdma_connect_private *pmsg = param->private_data; |
| 206 | unsigned int rsize, wsize; |
| 207 | |
| 208 | /* Default settings for RPC-over-RDMA Version One */ |
| 209 | r_xprt->rx_ia.ri_reminv_expected = false; |
| 210 | r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize; |
| 211 | rsize = RPCRDMA_V1_DEF_INLINE_SIZE; |
| 212 | wsize = RPCRDMA_V1_DEF_INLINE_SIZE; |
| 213 | |
| 214 | if (pmsg && |
| 215 | pmsg->cp_magic == rpcrdma_cmp_magic && |
| 216 | pmsg->cp_version == RPCRDMA_CMP_VERSION) { |
| 217 | r_xprt->rx_ia.ri_reminv_expected = true; |
| 218 | r_xprt->rx_ia.ri_implicit_roundup = true; |
| 219 | rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size); |
| 220 | wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size); |
| 221 | } |
| 222 | |
| 223 | if (rsize < cdata->inline_rsize) |
| 224 | cdata->inline_rsize = rsize; |
| 225 | if (wsize < cdata->inline_wsize) |
| 226 | cdata->inline_wsize = wsize; |
| 227 | dprintk("RPC: %s: max send %u, max recv %u\n", |
| 228 | __func__, cdata->inline_wsize, cdata->inline_rsize); |
| 229 | rpcrdma_set_max_header_sizes(r_xprt); |
| 230 | } |
| 231 | |
| 232 | static int |
| 233 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) |
| 234 | { |
| 235 | struct rpcrdma_xprt *xprt = id->context; |
| 236 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
| 237 | struct rpcrdma_ep *ep = &xprt->rx_ep; |
| 238 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
| 239 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
| 240 | #endif |
| 241 | int connstate = 0; |
| 242 | |
| 243 | switch (event->event) { |
| 244 | case RDMA_CM_EVENT_ADDR_RESOLVED: |
| 245 | case RDMA_CM_EVENT_ROUTE_RESOLVED: |
| 246 | ia->ri_async_rc = 0; |
| 247 | complete(&ia->ri_done); |
| 248 | break; |
| 249 | case RDMA_CM_EVENT_ADDR_ERROR: |
| 250 | ia->ri_async_rc = -EHOSTUNREACH; |
| 251 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", |
| 252 | __func__, ep); |
| 253 | complete(&ia->ri_done); |
| 254 | break; |
| 255 | case RDMA_CM_EVENT_ROUTE_ERROR: |
| 256 | ia->ri_async_rc = -ENETUNREACH; |
| 257 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", |
| 258 | __func__, ep); |
| 259 | complete(&ia->ri_done); |
| 260 | break; |
| 261 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| 262 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
| 263 | pr_info("rpcrdma: removing device %s for %pIS:%u\n", |
| 264 | ia->ri_device->name, |
| 265 | sap, rpc_get_port(sap)); |
| 266 | #endif |
| 267 | set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags); |
| 268 | ep->rep_connected = -ENODEV; |
| 269 | xprt_force_disconnect(&xprt->rx_xprt); |
| 270 | wait_for_completion(&ia->ri_remove_done); |
| 271 | |
| 272 | ia->ri_id = NULL; |
| 273 | ia->ri_pd = NULL; |
| 274 | ia->ri_device = NULL; |
| 275 | /* Return 1 to ensure the core destroys the id. */ |
| 276 | return 1; |
| 277 | case RDMA_CM_EVENT_ESTABLISHED: |
| 278 | connstate = 1; |
| 279 | rpcrdma_update_connect_private(xprt, &event->param.conn); |
| 280 | goto connected; |
| 281 | case RDMA_CM_EVENT_CONNECT_ERROR: |
| 282 | connstate = -ENOTCONN; |
| 283 | goto connected; |
| 284 | case RDMA_CM_EVENT_UNREACHABLE: |
| 285 | connstate = -ENETDOWN; |
| 286 | goto connected; |
| 287 | case RDMA_CM_EVENT_REJECTED: |
| 288 | dprintk("rpcrdma: connection to %pIS:%u rejected: %s\n", |
| 289 | sap, rpc_get_port(sap), |
| 290 | rdma_reject_msg(id, event->status)); |
| 291 | connstate = -ECONNREFUSED; |
| 292 | if (event->status == IB_CM_REJ_STALE_CONN) |
| 293 | connstate = -EAGAIN; |
| 294 | goto connected; |
| 295 | case RDMA_CM_EVENT_DISCONNECTED: |
| 296 | connstate = -ECONNABORTED; |
| 297 | connected: |
| 298 | atomic_set(&xprt->rx_buf.rb_credits, 1); |
| 299 | ep->rep_connected = connstate; |
| 300 | rpcrdma_conn_func(ep); |
| 301 | wake_up_all(&ep->rep_connect_wait); |
| 302 | /*FALLTHROUGH*/ |
| 303 | default: |
| 304 | dprintk("RPC: %s: %pIS:%u on %s/%s (ep 0x%p): %s\n", |
| 305 | __func__, sap, rpc_get_port(sap), |
| 306 | ia->ri_device->name, ia->ri_ops->ro_displayname, |
| 307 | ep, rdma_event_msg(event->event)); |
| 308 | break; |
| 309 | } |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | static struct rdma_cm_id * |
| 315 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, |
| 316 | struct rpcrdma_ia *ia, struct sockaddr *addr) |
| 317 | { |
| 318 | unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1; |
| 319 | struct rdma_cm_id *id; |
| 320 | int rc; |
| 321 | |
| 322 | init_completion(&ia->ri_done); |
| 323 | init_completion(&ia->ri_remove_done); |
| 324 | |
| 325 | id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, |
| 326 | IB_QPT_RC); |
| 327 | if (IS_ERR(id)) { |
| 328 | rc = PTR_ERR(id); |
| 329 | dprintk("RPC: %s: rdma_create_id() failed %i\n", |
| 330 | __func__, rc); |
| 331 | return id; |
| 332 | } |
| 333 | |
| 334 | ia->ri_async_rc = -ETIMEDOUT; |
| 335 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
| 336 | if (rc) { |
| 337 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", |
| 338 | __func__, rc); |
| 339 | goto out; |
| 340 | } |
| 341 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
| 342 | if (rc < 0) { |
| 343 | dprintk("RPC: %s: wait() exited: %i\n", |
| 344 | __func__, rc); |
| 345 | goto out; |
| 346 | } |
| 347 | |
| 348 | rc = ia->ri_async_rc; |
| 349 | if (rc) |
| 350 | goto out; |
| 351 | |
| 352 | ia->ri_async_rc = -ETIMEDOUT; |
| 353 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
| 354 | if (rc) { |
| 355 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", |
| 356 | __func__, rc); |
| 357 | goto out; |
| 358 | } |
| 359 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
| 360 | if (rc < 0) { |
| 361 | dprintk("RPC: %s: wait() exited: %i\n", |
| 362 | __func__, rc); |
| 363 | goto out; |
| 364 | } |
| 365 | rc = ia->ri_async_rc; |
| 366 | if (rc) |
| 367 | goto out; |
| 368 | |
| 369 | return id; |
| 370 | |
| 371 | out: |
| 372 | rdma_destroy_id(id); |
| 373 | return ERR_PTR(rc); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Exported functions. |
| 378 | */ |
| 379 | |
| 380 | /** |
| 381 | * rpcrdma_ia_open - Open and initialize an Interface Adapter. |
| 382 | * @xprt: controlling transport |
| 383 | * @addr: IP address of remote peer |
| 384 | * |
| 385 | * Returns 0 on success, negative errno if an appropriate |
| 386 | * Interface Adapter could not be found and opened. |
| 387 | */ |
| 388 | int |
| 389 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr) |
| 390 | { |
| 391 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
| 392 | int rc; |
| 393 | |
| 394 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
| 395 | if (IS_ERR(ia->ri_id)) { |
| 396 | rc = PTR_ERR(ia->ri_id); |
| 397 | goto out_err; |
| 398 | } |
| 399 | ia->ri_device = ia->ri_id->device; |
| 400 | |
| 401 | ia->ri_pd = ib_alloc_pd(ia->ri_device, 0); |
| 402 | if (IS_ERR(ia->ri_pd)) { |
| 403 | rc = PTR_ERR(ia->ri_pd); |
| 404 | pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc); |
| 405 | goto out_err; |
| 406 | } |
| 407 | |
| 408 | switch (xprt_rdma_memreg_strategy) { |
| 409 | case RPCRDMA_FRMR: |
| 410 | if (frwr_is_supported(ia)) { |
| 411 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; |
| 412 | break; |
| 413 | } |
| 414 | /*FALLTHROUGH*/ |
| 415 | case RPCRDMA_MTHCAFMR: |
| 416 | if (fmr_is_supported(ia)) { |
| 417 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; |
| 418 | break; |
| 419 | } |
| 420 | /*FALLTHROUGH*/ |
| 421 | default: |
| 422 | pr_err("rpcrdma: Device %s does not support memreg mode %d\n", |
| 423 | ia->ri_device->name, xprt_rdma_memreg_strategy); |
| 424 | rc = -EINVAL; |
| 425 | goto out_err; |
| 426 | } |
| 427 | |
| 428 | return 0; |
| 429 | |
| 430 | out_err: |
| 431 | rpcrdma_ia_close(ia); |
| 432 | return rc; |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * rpcrdma_ia_remove - Handle device driver unload |
| 437 | * @ia: interface adapter being removed |
| 438 | * |
| 439 | * Divest transport H/W resources associated with this adapter, |
| 440 | * but allow it to be restored later. |
| 441 | */ |
| 442 | void |
| 443 | rpcrdma_ia_remove(struct rpcrdma_ia *ia) |
| 444 | { |
| 445 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, |
| 446 | rx_ia); |
| 447 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; |
| 448 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 449 | struct rpcrdma_req *req; |
| 450 | struct rpcrdma_rep *rep; |
| 451 | |
| 452 | cancel_delayed_work_sync(&buf->rb_refresh_worker); |
| 453 | |
| 454 | /* This is similar to rpcrdma_ep_destroy, but: |
| 455 | * - Don't cancel the connect worker. |
| 456 | * - Don't call rpcrdma_ep_disconnect, which waits |
| 457 | * for another conn upcall, which will deadlock. |
| 458 | * - rdma_disconnect is unneeded, the underlying |
| 459 | * connection is already gone. |
| 460 | */ |
| 461 | if (ia->ri_id->qp) { |
| 462 | ib_drain_qp(ia->ri_id->qp); |
| 463 | rdma_destroy_qp(ia->ri_id); |
| 464 | ia->ri_id->qp = NULL; |
| 465 | } |
| 466 | ib_free_cq(ep->rep_attr.recv_cq); |
| 467 | ib_free_cq(ep->rep_attr.send_cq); |
| 468 | |
| 469 | /* The ULP is responsible for ensuring all DMA |
| 470 | * mappings and MRs are gone. |
| 471 | */ |
| 472 | list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list) |
| 473 | rpcrdma_dma_unmap_regbuf(rep->rr_rdmabuf); |
| 474 | list_for_each_entry(req, &buf->rb_allreqs, rl_all) { |
| 475 | rpcrdma_dma_unmap_regbuf(req->rl_rdmabuf); |
| 476 | rpcrdma_dma_unmap_regbuf(req->rl_sendbuf); |
| 477 | rpcrdma_dma_unmap_regbuf(req->rl_recvbuf); |
| 478 | } |
| 479 | rpcrdma_destroy_mrs(buf); |
| 480 | |
| 481 | /* Allow waiters to continue */ |
| 482 | complete(&ia->ri_remove_done); |
| 483 | } |
| 484 | |
| 485 | /** |
| 486 | * rpcrdma_ia_close - Clean up/close an IA. |
| 487 | * @ia: interface adapter to close |
| 488 | * |
| 489 | */ |
| 490 | void |
| 491 | rpcrdma_ia_close(struct rpcrdma_ia *ia) |
| 492 | { |
| 493 | dprintk("RPC: %s: entering\n", __func__); |
| 494 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
| 495 | if (ia->ri_id->qp) |
| 496 | rdma_destroy_qp(ia->ri_id); |
| 497 | rdma_destroy_id(ia->ri_id); |
| 498 | } |
| 499 | ia->ri_id = NULL; |
| 500 | ia->ri_device = NULL; |
| 501 | |
| 502 | /* If the pd is still busy, xprtrdma missed freeing a resource */ |
| 503 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) |
| 504 | ib_dealloc_pd(ia->ri_pd); |
| 505 | ia->ri_pd = NULL; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * Create unconnected endpoint. |
| 510 | */ |
| 511 | int |
| 512 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, |
| 513 | struct rpcrdma_create_data_internal *cdata) |
| 514 | { |
| 515 | struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private; |
| 516 | unsigned int max_qp_wr, max_sge; |
| 517 | struct ib_cq *sendcq, *recvcq; |
| 518 | int rc; |
| 519 | |
| 520 | max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge, |
| 521 | RPCRDMA_MAX_SEND_SGES); |
| 522 | if (max_sge < RPCRDMA_MIN_SEND_SGES) { |
| 523 | pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge); |
| 524 | return -ENOMEM; |
| 525 | } |
| 526 | ia->ri_max_send_sges = max_sge - RPCRDMA_MIN_SEND_SGES; |
| 527 | |
| 528 | if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) { |
| 529 | dprintk("RPC: %s: insufficient wqe's available\n", |
| 530 | __func__); |
| 531 | return -ENOMEM; |
| 532 | } |
| 533 | max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1; |
| 534 | |
| 535 | /* check provider's send/recv wr limits */ |
| 536 | if (cdata->max_requests > max_qp_wr) |
| 537 | cdata->max_requests = max_qp_wr; |
| 538 | |
| 539 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; |
| 540 | ep->rep_attr.qp_context = ep; |
| 541 | ep->rep_attr.srq = NULL; |
| 542 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; |
| 543 | ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS; |
| 544 | ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */ |
| 545 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
| 546 | if (rc) |
| 547 | return rc; |
| 548 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
| 549 | ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS; |
| 550 | ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */ |
| 551 | ep->rep_attr.cap.max_send_sge = max_sge; |
| 552 | ep->rep_attr.cap.max_recv_sge = 1; |
| 553 | ep->rep_attr.cap.max_inline_data = 0; |
| 554 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| 555 | ep->rep_attr.qp_type = IB_QPT_RC; |
| 556 | ep->rep_attr.port_num = ~0; |
| 557 | |
| 558 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " |
| 559 | "iovs: send %d recv %d\n", |
| 560 | __func__, |
| 561 | ep->rep_attr.cap.max_send_wr, |
| 562 | ep->rep_attr.cap.max_recv_wr, |
| 563 | ep->rep_attr.cap.max_send_sge, |
| 564 | ep->rep_attr.cap.max_recv_sge); |
| 565 | |
| 566 | /* set trigger for requesting send completion */ |
| 567 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
| 568 | if (ep->rep_cqinit <= 2) |
| 569 | ep->rep_cqinit = 0; /* always signal? */ |
| 570 | rpcrdma_init_cqcount(ep, 0); |
| 571 | init_waitqueue_head(&ep->rep_connect_wait); |
| 572 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
| 573 | |
| 574 | sendcq = ib_alloc_cq(ia->ri_device, NULL, |
| 575 | ep->rep_attr.cap.max_send_wr + 1, |
| 576 | 0, IB_POLL_SOFTIRQ); |
| 577 | if (IS_ERR(sendcq)) { |
| 578 | rc = PTR_ERR(sendcq); |
| 579 | dprintk("RPC: %s: failed to create send CQ: %i\n", |
| 580 | __func__, rc); |
| 581 | goto out1; |
| 582 | } |
| 583 | |
| 584 | recvcq = ib_alloc_cq(ia->ri_device, NULL, |
| 585 | ep->rep_attr.cap.max_recv_wr + 1, |
| 586 | 0, IB_POLL_WORKQUEUE); |
| 587 | if (IS_ERR(recvcq)) { |
| 588 | rc = PTR_ERR(recvcq); |
| 589 | dprintk("RPC: %s: failed to create recv CQ: %i\n", |
| 590 | __func__, rc); |
| 591 | goto out2; |
| 592 | } |
| 593 | |
| 594 | ep->rep_attr.send_cq = sendcq; |
| 595 | ep->rep_attr.recv_cq = recvcq; |
| 596 | |
| 597 | /* Initialize cma parameters */ |
| 598 | memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma)); |
| 599 | |
| 600 | /* Prepare RDMA-CM private message */ |
| 601 | pmsg->cp_magic = rpcrdma_cmp_magic; |
| 602 | pmsg->cp_version = RPCRDMA_CMP_VERSION; |
| 603 | pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok; |
| 604 | pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize); |
| 605 | pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize); |
| 606 | ep->rep_remote_cma.private_data = pmsg; |
| 607 | ep->rep_remote_cma.private_data_len = sizeof(*pmsg); |
| 608 | |
| 609 | /* Client offers RDMA Read but does not initiate */ |
| 610 | ep->rep_remote_cma.initiator_depth = 0; |
| 611 | if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
| 612 | ep->rep_remote_cma.responder_resources = 32; |
| 613 | else |
| 614 | ep->rep_remote_cma.responder_resources = |
| 615 | ia->ri_device->attrs.max_qp_rd_atom; |
| 616 | |
| 617 | /* Limit transport retries so client can detect server |
| 618 | * GID changes quickly. RPC layer handles re-establishing |
| 619 | * transport connection and retransmission. |
| 620 | */ |
| 621 | ep->rep_remote_cma.retry_count = 6; |
| 622 | |
| 623 | /* RPC-over-RDMA handles its own flow control. In addition, |
| 624 | * make all RNR NAKs visible so we know that RPC-over-RDMA |
| 625 | * flow control is working correctly (no NAKs should be seen). |
| 626 | */ |
| 627 | ep->rep_remote_cma.flow_control = 0; |
| 628 | ep->rep_remote_cma.rnr_retry_count = 0; |
| 629 | |
| 630 | return 0; |
| 631 | |
| 632 | out2: |
| 633 | ib_free_cq(sendcq); |
| 634 | out1: |
| 635 | return rc; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * rpcrdma_ep_destroy |
| 640 | * |
| 641 | * Disconnect and destroy endpoint. After this, the only |
| 642 | * valid operations on the ep are to free it (if dynamically |
| 643 | * allocated) or re-create it. |
| 644 | */ |
| 645 | void |
| 646 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
| 647 | { |
| 648 | dprintk("RPC: %s: entering, connected is %d\n", |
| 649 | __func__, ep->rep_connected); |
| 650 | |
| 651 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
| 652 | |
| 653 | if (ia->ri_id->qp) { |
| 654 | rpcrdma_ep_disconnect(ep, ia); |
| 655 | rdma_destroy_qp(ia->ri_id); |
| 656 | ia->ri_id->qp = NULL; |
| 657 | } |
| 658 | |
| 659 | ib_free_cq(ep->rep_attr.recv_cq); |
| 660 | ib_free_cq(ep->rep_attr.send_cq); |
| 661 | } |
| 662 | |
| 663 | /* Re-establish a connection after a device removal event. |
| 664 | * Unlike a normal reconnection, a fresh PD and a new set |
| 665 | * of MRs and buffers is needed. |
| 666 | */ |
| 667 | static int |
| 668 | rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt, |
| 669 | struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
| 670 | { |
| 671 | struct sockaddr *sap = (struct sockaddr *)&r_xprt->rx_data.addr; |
| 672 | int rc, err; |
| 673 | |
| 674 | pr_info("%s: r_xprt = %p\n", __func__, r_xprt); |
| 675 | |
| 676 | rc = -EHOSTUNREACH; |
| 677 | if (rpcrdma_ia_open(r_xprt, sap)) |
| 678 | goto out1; |
| 679 | |
| 680 | rc = -ENOMEM; |
| 681 | err = rpcrdma_ep_create(ep, ia, &r_xprt->rx_data); |
| 682 | if (err) { |
| 683 | pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err); |
| 684 | goto out2; |
| 685 | } |
| 686 | |
| 687 | rc = -ENETUNREACH; |
| 688 | err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); |
| 689 | if (err) { |
| 690 | pr_err("rpcrdma: rdma_create_qp returned %d\n", err); |
| 691 | goto out3; |
| 692 | } |
| 693 | |
| 694 | rpcrdma_create_mrs(r_xprt); |
| 695 | return 0; |
| 696 | |
| 697 | out3: |
| 698 | rpcrdma_ep_destroy(ep, ia); |
| 699 | out2: |
| 700 | rpcrdma_ia_close(ia); |
| 701 | out1: |
| 702 | return rc; |
| 703 | } |
| 704 | |
| 705 | static int |
| 706 | rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep, |
| 707 | struct rpcrdma_ia *ia) |
| 708 | { |
| 709 | struct sockaddr *sap = (struct sockaddr *)&r_xprt->rx_data.addr; |
| 710 | struct rdma_cm_id *id, *old; |
| 711 | int err, rc; |
| 712 | |
| 713 | dprintk("RPC: %s: reconnecting...\n", __func__); |
| 714 | |
| 715 | rpcrdma_ep_disconnect(ep, ia); |
| 716 | |
| 717 | rc = -EHOSTUNREACH; |
| 718 | id = rpcrdma_create_id(r_xprt, ia, sap); |
| 719 | if (IS_ERR(id)) |
| 720 | goto out; |
| 721 | |
| 722 | /* As long as the new ID points to the same device as the |
| 723 | * old ID, we can reuse the transport's existing PD and all |
| 724 | * previously allocated MRs. Also, the same device means |
| 725 | * the transport's previous DMA mappings are still valid. |
| 726 | * |
| 727 | * This is a sanity check only. There should be no way these |
| 728 | * point to two different devices here. |
| 729 | */ |
| 730 | old = id; |
| 731 | rc = -ENETUNREACH; |
| 732 | if (ia->ri_device != id->device) { |
| 733 | pr_err("rpcrdma: can't reconnect on different device!\n"); |
| 734 | goto out_destroy; |
| 735 | } |
| 736 | |
| 737 | err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
| 738 | if (err) { |
| 739 | dprintk("RPC: %s: rdma_create_qp returned %d\n", |
| 740 | __func__, err); |
| 741 | goto out_destroy; |
| 742 | } |
| 743 | |
| 744 | /* Atomically replace the transport's ID and QP. */ |
| 745 | rc = 0; |
| 746 | old = ia->ri_id; |
| 747 | ia->ri_id = id; |
| 748 | rdma_destroy_qp(old); |
| 749 | |
| 750 | out_destroy: |
| 751 | rdma_destroy_id(old); |
| 752 | out: |
| 753 | return rc; |
| 754 | } |
| 755 | |
| 756 | /* |
| 757 | * Connect unconnected endpoint. |
| 758 | */ |
| 759 | int |
| 760 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
| 761 | { |
| 762 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, |
| 763 | rx_ia); |
| 764 | unsigned int extras; |
| 765 | int rc; |
| 766 | |
| 767 | retry: |
| 768 | switch (ep->rep_connected) { |
| 769 | case 0: |
| 770 | dprintk("RPC: %s: connecting...\n", __func__); |
| 771 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); |
| 772 | if (rc) { |
| 773 | dprintk("RPC: %s: rdma_create_qp failed %i\n", |
| 774 | __func__, rc); |
| 775 | rc = -ENETUNREACH; |
| 776 | goto out_noupdate; |
| 777 | } |
| 778 | break; |
| 779 | case -ENODEV: |
| 780 | rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia); |
| 781 | if (rc) |
| 782 | goto out_noupdate; |
| 783 | break; |
| 784 | default: |
| 785 | rc = rpcrdma_ep_reconnect(r_xprt, ep, ia); |
| 786 | if (rc) |
| 787 | goto out; |
| 788 | } |
| 789 | |
| 790 | ep->rep_connected = 0; |
| 791 | |
| 792 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); |
| 793 | if (rc) { |
| 794 | dprintk("RPC: %s: rdma_connect() failed with %i\n", |
| 795 | __func__, rc); |
| 796 | goto out; |
| 797 | } |
| 798 | |
| 799 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
| 800 | if (ep->rep_connected <= 0) { |
| 801 | if (ep->rep_connected == -EAGAIN) |
| 802 | goto retry; |
| 803 | rc = ep->rep_connected; |
| 804 | goto out; |
| 805 | } |
| 806 | |
| 807 | dprintk("RPC: %s: connected\n", __func__); |
| 808 | extras = r_xprt->rx_buf.rb_bc_srv_max_requests; |
| 809 | if (extras) |
| 810 | rpcrdma_ep_post_extra_recv(r_xprt, extras); |
| 811 | |
| 812 | out: |
| 813 | if (rc) |
| 814 | ep->rep_connected = rc; |
| 815 | |
| 816 | out_noupdate: |
| 817 | return rc; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * rpcrdma_ep_disconnect |
| 822 | * |
| 823 | * This is separate from destroy to facilitate the ability |
| 824 | * to reconnect without recreating the endpoint. |
| 825 | * |
| 826 | * This call is not reentrant, and must not be made in parallel |
| 827 | * on the same endpoint. |
| 828 | */ |
| 829 | void |
| 830 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
| 831 | { |
| 832 | int rc; |
| 833 | |
| 834 | rc = rdma_disconnect(ia->ri_id); |
| 835 | if (!rc) { |
| 836 | /* returns without wait if not connected */ |
| 837 | wait_event_interruptible(ep->rep_connect_wait, |
| 838 | ep->rep_connected != 1); |
| 839 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, |
| 840 | (ep->rep_connected == 1) ? "still " : "dis"); |
| 841 | } else { |
| 842 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); |
| 843 | ep->rep_connected = rc; |
| 844 | } |
| 845 | |
| 846 | ib_drain_qp(ia->ri_id->qp); |
| 847 | } |
| 848 | |
| 849 | static void |
| 850 | rpcrdma_mr_recovery_worker(struct work_struct *work) |
| 851 | { |
| 852 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, |
| 853 | rb_recovery_worker.work); |
| 854 | struct rpcrdma_mw *mw; |
| 855 | |
| 856 | spin_lock(&buf->rb_recovery_lock); |
| 857 | while (!list_empty(&buf->rb_stale_mrs)) { |
| 858 | mw = rpcrdma_pop_mw(&buf->rb_stale_mrs); |
| 859 | spin_unlock(&buf->rb_recovery_lock); |
| 860 | |
| 861 | dprintk("RPC: %s: recovering MR %p\n", __func__, mw); |
| 862 | mw->mw_xprt->rx_ia.ri_ops->ro_recover_mr(mw); |
| 863 | |
| 864 | spin_lock(&buf->rb_recovery_lock); |
| 865 | } |
| 866 | spin_unlock(&buf->rb_recovery_lock); |
| 867 | } |
| 868 | |
| 869 | void |
| 870 | rpcrdma_defer_mr_recovery(struct rpcrdma_mw *mw) |
| 871 | { |
| 872 | struct rpcrdma_xprt *r_xprt = mw->mw_xprt; |
| 873 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 874 | |
| 875 | spin_lock(&buf->rb_recovery_lock); |
| 876 | rpcrdma_push_mw(mw, &buf->rb_stale_mrs); |
| 877 | spin_unlock(&buf->rb_recovery_lock); |
| 878 | |
| 879 | schedule_delayed_work(&buf->rb_recovery_worker, 0); |
| 880 | } |
| 881 | |
| 882 | static void |
| 883 | rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt) |
| 884 | { |
| 885 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 886 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
| 887 | unsigned int count; |
| 888 | LIST_HEAD(free); |
| 889 | LIST_HEAD(all); |
| 890 | |
| 891 | for (count = 0; count < 32; count++) { |
| 892 | struct rpcrdma_mw *mw; |
| 893 | int rc; |
| 894 | |
| 895 | mw = kzalloc(sizeof(*mw), GFP_KERNEL); |
| 896 | if (!mw) |
| 897 | break; |
| 898 | |
| 899 | rc = ia->ri_ops->ro_init_mr(ia, mw); |
| 900 | if (rc) { |
| 901 | kfree(mw); |
| 902 | break; |
| 903 | } |
| 904 | |
| 905 | mw->mw_xprt = r_xprt; |
| 906 | |
| 907 | list_add(&mw->mw_list, &free); |
| 908 | list_add(&mw->mw_all, &all); |
| 909 | } |
| 910 | |
| 911 | spin_lock(&buf->rb_mwlock); |
| 912 | list_splice(&free, &buf->rb_mws); |
| 913 | list_splice(&all, &buf->rb_all); |
| 914 | r_xprt->rx_stats.mrs_allocated += count; |
| 915 | spin_unlock(&buf->rb_mwlock); |
| 916 | |
| 917 | dprintk("RPC: %s: created %u MRs\n", __func__, count); |
| 918 | } |
| 919 | |
| 920 | static void |
| 921 | rpcrdma_mr_refresh_worker(struct work_struct *work) |
| 922 | { |
| 923 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, |
| 924 | rb_refresh_worker.work); |
| 925 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, |
| 926 | rx_buf); |
| 927 | |
| 928 | rpcrdma_create_mrs(r_xprt); |
| 929 | } |
| 930 | |
| 931 | struct rpcrdma_req * |
| 932 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) |
| 933 | { |
| 934 | struct rpcrdma_buffer *buffer = &r_xprt->rx_buf; |
| 935 | struct rpcrdma_req *req; |
| 936 | |
| 937 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
| 938 | if (req == NULL) |
| 939 | return ERR_PTR(-ENOMEM); |
| 940 | |
| 941 | spin_lock(&buffer->rb_reqslock); |
| 942 | list_add(&req->rl_all, &buffer->rb_allreqs); |
| 943 | spin_unlock(&buffer->rb_reqslock); |
| 944 | req->rl_cqe.done = rpcrdma_wc_send; |
| 945 | req->rl_buffer = &r_xprt->rx_buf; |
| 946 | INIT_LIST_HEAD(&req->rl_registered); |
| 947 | req->rl_send_wr.next = NULL; |
| 948 | req->rl_send_wr.wr_cqe = &req->rl_cqe; |
| 949 | req->rl_send_wr.sg_list = req->rl_send_sge; |
| 950 | req->rl_send_wr.opcode = IB_WR_SEND; |
| 951 | return req; |
| 952 | } |
| 953 | |
| 954 | struct rpcrdma_rep * |
| 955 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) |
| 956 | { |
| 957 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; |
| 958 | struct rpcrdma_rep *rep; |
| 959 | int rc; |
| 960 | |
| 961 | rc = -ENOMEM; |
| 962 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
| 963 | if (rep == NULL) |
| 964 | goto out; |
| 965 | |
| 966 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize, |
| 967 | DMA_FROM_DEVICE, GFP_KERNEL); |
| 968 | if (IS_ERR(rep->rr_rdmabuf)) { |
| 969 | rc = PTR_ERR(rep->rr_rdmabuf); |
| 970 | goto out_free; |
| 971 | } |
| 972 | xdr_buf_init(&rep->rr_hdrbuf, rep->rr_rdmabuf->rg_base, |
| 973 | rdmab_length(rep->rr_rdmabuf)); |
| 974 | |
| 975 | rep->rr_cqe.done = rpcrdma_wc_receive; |
| 976 | rep->rr_rxprt = r_xprt; |
| 977 | INIT_WORK(&rep->rr_work, rpcrdma_deferred_completion); |
| 978 | rep->rr_recv_wr.next = NULL; |
| 979 | rep->rr_recv_wr.wr_cqe = &rep->rr_cqe; |
| 980 | rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; |
| 981 | rep->rr_recv_wr.num_sge = 1; |
| 982 | return rep; |
| 983 | |
| 984 | out_free: |
| 985 | kfree(rep); |
| 986 | out: |
| 987 | return ERR_PTR(rc); |
| 988 | } |
| 989 | |
| 990 | int |
| 991 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
| 992 | { |
| 993 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 994 | int i, rc; |
| 995 | |
| 996 | buf->rb_max_requests = r_xprt->rx_data.max_requests; |
| 997 | buf->rb_bc_srv_max_requests = 0; |
| 998 | atomic_set(&buf->rb_credits, 1); |
| 999 | spin_lock_init(&buf->rb_mwlock); |
| 1000 | spin_lock_init(&buf->rb_lock); |
| 1001 | spin_lock_init(&buf->rb_recovery_lock); |
| 1002 | INIT_LIST_HEAD(&buf->rb_mws); |
| 1003 | INIT_LIST_HEAD(&buf->rb_all); |
| 1004 | INIT_LIST_HEAD(&buf->rb_stale_mrs); |
| 1005 | INIT_DELAYED_WORK(&buf->rb_refresh_worker, |
| 1006 | rpcrdma_mr_refresh_worker); |
| 1007 | INIT_DELAYED_WORK(&buf->rb_recovery_worker, |
| 1008 | rpcrdma_mr_recovery_worker); |
| 1009 | |
| 1010 | rpcrdma_create_mrs(r_xprt); |
| 1011 | |
| 1012 | INIT_LIST_HEAD(&buf->rb_send_bufs); |
| 1013 | INIT_LIST_HEAD(&buf->rb_allreqs); |
| 1014 | spin_lock_init(&buf->rb_reqslock); |
| 1015 | for (i = 0; i < buf->rb_max_requests; i++) { |
| 1016 | struct rpcrdma_req *req; |
| 1017 | |
| 1018 | req = rpcrdma_create_req(r_xprt); |
| 1019 | if (IS_ERR(req)) { |
| 1020 | dprintk("RPC: %s: request buffer %d alloc" |
| 1021 | " failed\n", __func__, i); |
| 1022 | rc = PTR_ERR(req); |
| 1023 | goto out; |
| 1024 | } |
| 1025 | req->rl_backchannel = false; |
| 1026 | list_add(&req->rl_list, &buf->rb_send_bufs); |
| 1027 | } |
| 1028 | |
| 1029 | INIT_LIST_HEAD(&buf->rb_recv_bufs); |
| 1030 | for (i = 0; i < buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; i++) { |
| 1031 | struct rpcrdma_rep *rep; |
| 1032 | |
| 1033 | rep = rpcrdma_create_rep(r_xprt); |
| 1034 | if (IS_ERR(rep)) { |
| 1035 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
| 1036 | __func__, i); |
| 1037 | rc = PTR_ERR(rep); |
| 1038 | goto out; |
| 1039 | } |
| 1040 | list_add(&rep->rr_list, &buf->rb_recv_bufs); |
| 1041 | } |
| 1042 | |
| 1043 | return 0; |
| 1044 | out: |
| 1045 | rpcrdma_buffer_destroy(buf); |
| 1046 | return rc; |
| 1047 | } |
| 1048 | |
| 1049 | static struct rpcrdma_req * |
| 1050 | rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf) |
| 1051 | { |
| 1052 | struct rpcrdma_req *req; |
| 1053 | |
| 1054 | req = list_first_entry(&buf->rb_send_bufs, |
| 1055 | struct rpcrdma_req, rl_list); |
| 1056 | list_del_init(&req->rl_list); |
| 1057 | return req; |
| 1058 | } |
| 1059 | |
| 1060 | static struct rpcrdma_rep * |
| 1061 | rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf) |
| 1062 | { |
| 1063 | struct rpcrdma_rep *rep; |
| 1064 | |
| 1065 | rep = list_first_entry(&buf->rb_recv_bufs, |
| 1066 | struct rpcrdma_rep, rr_list); |
| 1067 | list_del(&rep->rr_list); |
| 1068 | return rep; |
| 1069 | } |
| 1070 | |
| 1071 | static void |
| 1072 | rpcrdma_destroy_rep(struct rpcrdma_rep *rep) |
| 1073 | { |
| 1074 | rpcrdma_free_regbuf(rep->rr_rdmabuf); |
| 1075 | kfree(rep); |
| 1076 | } |
| 1077 | |
| 1078 | void |
| 1079 | rpcrdma_destroy_req(struct rpcrdma_req *req) |
| 1080 | { |
| 1081 | rpcrdma_free_regbuf(req->rl_recvbuf); |
| 1082 | rpcrdma_free_regbuf(req->rl_sendbuf); |
| 1083 | rpcrdma_free_regbuf(req->rl_rdmabuf); |
| 1084 | kfree(req); |
| 1085 | } |
| 1086 | |
| 1087 | static void |
| 1088 | rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf) |
| 1089 | { |
| 1090 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, |
| 1091 | rx_buf); |
| 1092 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); |
| 1093 | struct rpcrdma_mw *mw; |
| 1094 | unsigned int count; |
| 1095 | |
| 1096 | count = 0; |
| 1097 | spin_lock(&buf->rb_mwlock); |
| 1098 | while (!list_empty(&buf->rb_all)) { |
| 1099 | mw = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all); |
| 1100 | list_del(&mw->mw_all); |
| 1101 | |
| 1102 | spin_unlock(&buf->rb_mwlock); |
| 1103 | ia->ri_ops->ro_release_mr(mw); |
| 1104 | count++; |
| 1105 | spin_lock(&buf->rb_mwlock); |
| 1106 | } |
| 1107 | spin_unlock(&buf->rb_mwlock); |
| 1108 | r_xprt->rx_stats.mrs_allocated = 0; |
| 1109 | |
| 1110 | dprintk("RPC: %s: released %u MRs\n", __func__, count); |
| 1111 | } |
| 1112 | |
| 1113 | void |
| 1114 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) |
| 1115 | { |
| 1116 | cancel_delayed_work_sync(&buf->rb_recovery_worker); |
| 1117 | cancel_delayed_work_sync(&buf->rb_refresh_worker); |
| 1118 | |
| 1119 | while (!list_empty(&buf->rb_recv_bufs)) { |
| 1120 | struct rpcrdma_rep *rep; |
| 1121 | |
| 1122 | rep = rpcrdma_buffer_get_rep_locked(buf); |
| 1123 | rpcrdma_destroy_rep(rep); |
| 1124 | } |
| 1125 | buf->rb_send_count = 0; |
| 1126 | |
| 1127 | spin_lock(&buf->rb_reqslock); |
| 1128 | while (!list_empty(&buf->rb_allreqs)) { |
| 1129 | struct rpcrdma_req *req; |
| 1130 | |
| 1131 | req = list_first_entry(&buf->rb_allreqs, |
| 1132 | struct rpcrdma_req, rl_all); |
| 1133 | list_del(&req->rl_all); |
| 1134 | |
| 1135 | spin_unlock(&buf->rb_reqslock); |
| 1136 | rpcrdma_destroy_req(req); |
| 1137 | spin_lock(&buf->rb_reqslock); |
| 1138 | } |
| 1139 | spin_unlock(&buf->rb_reqslock); |
| 1140 | buf->rb_recv_count = 0; |
| 1141 | |
| 1142 | rpcrdma_destroy_mrs(buf); |
| 1143 | } |
| 1144 | |
| 1145 | struct rpcrdma_mw * |
| 1146 | rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) |
| 1147 | { |
| 1148 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 1149 | struct rpcrdma_mw *mw = NULL; |
| 1150 | |
| 1151 | spin_lock(&buf->rb_mwlock); |
| 1152 | if (!list_empty(&buf->rb_mws)) |
| 1153 | mw = rpcrdma_pop_mw(&buf->rb_mws); |
| 1154 | spin_unlock(&buf->rb_mwlock); |
| 1155 | |
| 1156 | if (!mw) |
| 1157 | goto out_nomws; |
| 1158 | mw->mw_flags = 0; |
| 1159 | return mw; |
| 1160 | |
| 1161 | out_nomws: |
| 1162 | dprintk("RPC: %s: no MWs available\n", __func__); |
| 1163 | if (r_xprt->rx_ep.rep_connected != -ENODEV) |
| 1164 | schedule_delayed_work(&buf->rb_refresh_worker, 0); |
| 1165 | |
| 1166 | /* Allow the reply handler and refresh worker to run */ |
| 1167 | cond_resched(); |
| 1168 | |
| 1169 | return NULL; |
| 1170 | } |
| 1171 | |
| 1172 | void |
| 1173 | rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) |
| 1174 | { |
| 1175 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
| 1176 | |
| 1177 | spin_lock(&buf->rb_mwlock); |
| 1178 | rpcrdma_push_mw(mw, &buf->rb_mws); |
| 1179 | spin_unlock(&buf->rb_mwlock); |
| 1180 | } |
| 1181 | |
| 1182 | static struct rpcrdma_rep * |
| 1183 | rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers) |
| 1184 | { |
| 1185 | /* If an RPC previously completed without a reply (say, a |
| 1186 | * credential problem or a soft timeout occurs) then hold off |
| 1187 | * on supplying more Receive buffers until the number of new |
| 1188 | * pending RPCs catches up to the number of posted Receives. |
| 1189 | */ |
| 1190 | if (unlikely(buffers->rb_send_count < buffers->rb_recv_count)) |
| 1191 | return NULL; |
| 1192 | |
| 1193 | if (unlikely(list_empty(&buffers->rb_recv_bufs))) |
| 1194 | return NULL; |
| 1195 | buffers->rb_recv_count++; |
| 1196 | return rpcrdma_buffer_get_rep_locked(buffers); |
| 1197 | } |
| 1198 | |
| 1199 | /* |
| 1200 | * Get a set of request/reply buffers. |
| 1201 | * |
| 1202 | * Reply buffer (if available) is attached to send buffer upon return. |
| 1203 | */ |
| 1204 | struct rpcrdma_req * |
| 1205 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) |
| 1206 | { |
| 1207 | struct rpcrdma_req *req; |
| 1208 | |
| 1209 | spin_lock(&buffers->rb_lock); |
| 1210 | if (list_empty(&buffers->rb_send_bufs)) |
| 1211 | goto out_reqbuf; |
| 1212 | buffers->rb_send_count++; |
| 1213 | req = rpcrdma_buffer_get_req_locked(buffers); |
| 1214 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
| 1215 | spin_unlock(&buffers->rb_lock); |
| 1216 | return req; |
| 1217 | |
| 1218 | out_reqbuf: |
| 1219 | spin_unlock(&buffers->rb_lock); |
| 1220 | pr_warn("RPC: %s: out of request buffers\n", __func__); |
| 1221 | return NULL; |
| 1222 | } |
| 1223 | |
| 1224 | /* |
| 1225 | * Put request/reply buffers back into pool. |
| 1226 | * Pre-decrement counter/array index. |
| 1227 | */ |
| 1228 | void |
| 1229 | rpcrdma_buffer_put(struct rpcrdma_req *req) |
| 1230 | { |
| 1231 | struct rpcrdma_buffer *buffers = req->rl_buffer; |
| 1232 | struct rpcrdma_rep *rep = req->rl_reply; |
| 1233 | |
| 1234 | req->rl_send_wr.num_sge = 0; |
| 1235 | req->rl_reply = NULL; |
| 1236 | |
| 1237 | spin_lock(&buffers->rb_lock); |
| 1238 | buffers->rb_send_count--; |
| 1239 | list_add_tail(&req->rl_list, &buffers->rb_send_bufs); |
| 1240 | if (rep) { |
| 1241 | buffers->rb_recv_count--; |
| 1242 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
| 1243 | } |
| 1244 | spin_unlock(&buffers->rb_lock); |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * Recover reply buffers from pool. |
| 1249 | * This happens when recovering from disconnect. |
| 1250 | */ |
| 1251 | void |
| 1252 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) |
| 1253 | { |
| 1254 | struct rpcrdma_buffer *buffers = req->rl_buffer; |
| 1255 | |
| 1256 | spin_lock(&buffers->rb_lock); |
| 1257 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
| 1258 | spin_unlock(&buffers->rb_lock); |
| 1259 | } |
| 1260 | |
| 1261 | /* |
| 1262 | * Put reply buffers back into pool when not attached to |
| 1263 | * request. This happens in error conditions. |
| 1264 | */ |
| 1265 | void |
| 1266 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) |
| 1267 | { |
| 1268 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
| 1269 | |
| 1270 | spin_lock(&buffers->rb_lock); |
| 1271 | buffers->rb_recv_count--; |
| 1272 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
| 1273 | spin_unlock(&buffers->rb_lock); |
| 1274 | } |
| 1275 | |
| 1276 | /** |
| 1277 | * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers |
| 1278 | * @size: size of buffer to be allocated, in bytes |
| 1279 | * @direction: direction of data movement |
| 1280 | * @flags: GFP flags |
| 1281 | * |
| 1282 | * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that |
| 1283 | * can be persistently DMA-mapped for I/O. |
| 1284 | * |
| 1285 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for |
| 1286 | * receiving the payload of RDMA RECV operations. During Long Calls |
| 1287 | * or Replies they may be registered externally via ro_map. |
| 1288 | */ |
| 1289 | struct rpcrdma_regbuf * |
| 1290 | rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction, |
| 1291 | gfp_t flags) |
| 1292 | { |
| 1293 | struct rpcrdma_regbuf *rb; |
| 1294 | |
| 1295 | rb = kmalloc(sizeof(*rb) + size, flags); |
| 1296 | if (rb == NULL) |
| 1297 | return ERR_PTR(-ENOMEM); |
| 1298 | |
| 1299 | rb->rg_device = NULL; |
| 1300 | rb->rg_direction = direction; |
| 1301 | rb->rg_iov.length = size; |
| 1302 | |
| 1303 | return rb; |
| 1304 | } |
| 1305 | |
| 1306 | /** |
| 1307 | * __rpcrdma_map_regbuf - DMA-map a regbuf |
| 1308 | * @ia: controlling rpcrdma_ia |
| 1309 | * @rb: regbuf to be mapped |
| 1310 | */ |
| 1311 | bool |
| 1312 | __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) |
| 1313 | { |
| 1314 | struct ib_device *device = ia->ri_device; |
| 1315 | |
| 1316 | if (rb->rg_direction == DMA_NONE) |
| 1317 | return false; |
| 1318 | |
| 1319 | rb->rg_iov.addr = ib_dma_map_single(device, |
| 1320 | (void *)rb->rg_base, |
| 1321 | rdmab_length(rb), |
| 1322 | rb->rg_direction); |
| 1323 | if (ib_dma_mapping_error(device, rdmab_addr(rb))) |
| 1324 | return false; |
| 1325 | |
| 1326 | rb->rg_device = device; |
| 1327 | rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey; |
| 1328 | return true; |
| 1329 | } |
| 1330 | |
| 1331 | static void |
| 1332 | rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb) |
| 1333 | { |
| 1334 | if (!rpcrdma_regbuf_is_mapped(rb)) |
| 1335 | return; |
| 1336 | |
| 1337 | ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), |
| 1338 | rdmab_length(rb), rb->rg_direction); |
| 1339 | rb->rg_device = NULL; |
| 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * rpcrdma_free_regbuf - deregister and free registered buffer |
| 1344 | * @rb: regbuf to be deregistered and freed |
| 1345 | */ |
| 1346 | void |
| 1347 | rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb) |
| 1348 | { |
| 1349 | if (!rb) |
| 1350 | return; |
| 1351 | |
| 1352 | rpcrdma_dma_unmap_regbuf(rb); |
| 1353 | kfree(rb); |
| 1354 | } |
| 1355 | |
| 1356 | /* |
| 1357 | * Prepost any receive buffer, then post send. |
| 1358 | * |
| 1359 | * Receive buffer is donated to hardware, reclaimed upon recv completion. |
| 1360 | */ |
| 1361 | int |
| 1362 | rpcrdma_ep_post(struct rpcrdma_ia *ia, |
| 1363 | struct rpcrdma_ep *ep, |
| 1364 | struct rpcrdma_req *req) |
| 1365 | { |
| 1366 | struct ib_send_wr *send_wr = &req->rl_send_wr; |
| 1367 | struct ib_send_wr *send_wr_fail; |
| 1368 | int rc; |
| 1369 | |
| 1370 | if (req->rl_reply) { |
| 1371 | rc = rpcrdma_ep_post_recv(ia, req->rl_reply); |
| 1372 | if (rc) |
| 1373 | return rc; |
| 1374 | req->rl_reply = NULL; |
| 1375 | } |
| 1376 | |
| 1377 | dprintk("RPC: %s: posting %d s/g entries\n", |
| 1378 | __func__, send_wr->num_sge); |
| 1379 | |
| 1380 | rpcrdma_set_signaled(ep, send_wr); |
| 1381 | rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail); |
| 1382 | if (rc) |
| 1383 | goto out_postsend_err; |
| 1384 | return 0; |
| 1385 | |
| 1386 | out_postsend_err: |
| 1387 | pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc); |
| 1388 | return -ENOTCONN; |
| 1389 | } |
| 1390 | |
| 1391 | int |
| 1392 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, |
| 1393 | struct rpcrdma_rep *rep) |
| 1394 | { |
| 1395 | struct ib_recv_wr *recv_wr_fail; |
| 1396 | int rc; |
| 1397 | |
| 1398 | if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf)) |
| 1399 | goto out_map; |
| 1400 | rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail); |
| 1401 | if (rc) |
| 1402 | goto out_postrecv; |
| 1403 | return 0; |
| 1404 | |
| 1405 | out_map: |
| 1406 | pr_err("rpcrdma: failed to DMA map the Receive buffer\n"); |
| 1407 | return -EIO; |
| 1408 | |
| 1409 | out_postrecv: |
| 1410 | pr_err("rpcrdma: ib_post_recv returned %i\n", rc); |
| 1411 | return -ENOTCONN; |
| 1412 | } |
| 1413 | |
| 1414 | /** |
| 1415 | * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests |
| 1416 | * @r_xprt: transport associated with these backchannel resources |
| 1417 | * @min_reqs: minimum number of incoming requests expected |
| 1418 | * |
| 1419 | * Returns zero if all requested buffers were posted, or a negative errno. |
| 1420 | */ |
| 1421 | int |
| 1422 | rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count) |
| 1423 | { |
| 1424 | struct rpcrdma_buffer *buffers = &r_xprt->rx_buf; |
| 1425 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
| 1426 | struct rpcrdma_rep *rep; |
| 1427 | int rc; |
| 1428 | |
| 1429 | while (count--) { |
| 1430 | spin_lock(&buffers->rb_lock); |
| 1431 | if (list_empty(&buffers->rb_recv_bufs)) |
| 1432 | goto out_reqbuf; |
| 1433 | rep = rpcrdma_buffer_get_rep_locked(buffers); |
| 1434 | spin_unlock(&buffers->rb_lock); |
| 1435 | |
| 1436 | rc = rpcrdma_ep_post_recv(ia, rep); |
| 1437 | if (rc) |
| 1438 | goto out_rc; |
| 1439 | } |
| 1440 | |
| 1441 | return 0; |
| 1442 | |
| 1443 | out_reqbuf: |
| 1444 | spin_unlock(&buffers->rb_lock); |
| 1445 | pr_warn("%s: no extra receive buffers\n", __func__); |
| 1446 | return -ENOMEM; |
| 1447 | |
| 1448 | out_rc: |
| 1449 | rpcrdma_recv_buffer_put(rep); |
| 1450 | return rc; |
| 1451 | } |