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TOMOYO Linux Cross Reference
Linux/net/rds/ib_cm.c

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  1 /*
  2  * Copyright (c) 2006 Oracle.  All rights reserved.
  3  *
  4  * This software is available to you under a choice of one of two
  5  * licenses.  You may choose to be licensed under the terms of the GNU
  6  * General Public License (GPL) Version 2, available from the file
  7  * COPYING in the main directory of this source tree, or the
  8  * OpenIB.org BSD license below:
  9  *
 10  *     Redistribution and use in source and binary forms, with or
 11  *     without modification, are permitted provided that the following
 12  *     conditions are met:
 13  *
 14  *      - Redistributions of source code must retain the above
 15  *        copyright notice, this list of conditions and the following
 16  *        disclaimer.
 17  *
 18  *      - Redistributions in binary form must reproduce the above
 19  *        copyright notice, this list of conditions and the following
 20  *        disclaimer in the documentation and/or other materials
 21  *        provided with the distribution.
 22  *
 23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 30  * SOFTWARE.
 31  *
 32  */
 33 #include <linux/kernel.h>
 34 #include <linux/in.h>
 35 #include <linux/slab.h>
 36 #include <linux/vmalloc.h>
 37 #include <linux/ratelimit.h>
 38 
 39 #include "rds.h"
 40 #include "ib.h"
 41 
 42 static char *rds_ib_event_type_strings[] = {
 43 #define RDS_IB_EVENT_STRING(foo) \
 44                 [IB_EVENT_##foo] = __stringify(IB_EVENT_##foo)
 45         RDS_IB_EVENT_STRING(CQ_ERR),
 46         RDS_IB_EVENT_STRING(QP_FATAL),
 47         RDS_IB_EVENT_STRING(QP_REQ_ERR),
 48         RDS_IB_EVENT_STRING(QP_ACCESS_ERR),
 49         RDS_IB_EVENT_STRING(COMM_EST),
 50         RDS_IB_EVENT_STRING(SQ_DRAINED),
 51         RDS_IB_EVENT_STRING(PATH_MIG),
 52         RDS_IB_EVENT_STRING(PATH_MIG_ERR),
 53         RDS_IB_EVENT_STRING(DEVICE_FATAL),
 54         RDS_IB_EVENT_STRING(PORT_ACTIVE),
 55         RDS_IB_EVENT_STRING(PORT_ERR),
 56         RDS_IB_EVENT_STRING(LID_CHANGE),
 57         RDS_IB_EVENT_STRING(PKEY_CHANGE),
 58         RDS_IB_EVENT_STRING(SM_CHANGE),
 59         RDS_IB_EVENT_STRING(SRQ_ERR),
 60         RDS_IB_EVENT_STRING(SRQ_LIMIT_REACHED),
 61         RDS_IB_EVENT_STRING(QP_LAST_WQE_REACHED),
 62         RDS_IB_EVENT_STRING(CLIENT_REREGISTER),
 63 #undef RDS_IB_EVENT_STRING
 64 };
 65 
 66 static char *rds_ib_event_str(enum ib_event_type type)
 67 {
 68         return rds_str_array(rds_ib_event_type_strings,
 69                              ARRAY_SIZE(rds_ib_event_type_strings), type);
 70 };
 71 
 72 /*
 73  * Set the selected protocol version
 74  */
 75 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
 76 {
 77         conn->c_version = version;
 78 }
 79 
 80 /*
 81  * Set up flow control
 82  */
 83 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
 84 {
 85         struct rds_ib_connection *ic = conn->c_transport_data;
 86 
 87         if (rds_ib_sysctl_flow_control && credits != 0) {
 88                 /* We're doing flow control */
 89                 ic->i_flowctl = 1;
 90                 rds_ib_send_add_credits(conn, credits);
 91         } else {
 92                 ic->i_flowctl = 0;
 93         }
 94 }
 95 
 96 /*
 97  * Tune RNR behavior. Without flow control, we use a rather
 98  * low timeout, but not the absolute minimum - this should
 99  * be tunable.
100  *
101  * We already set the RNR retry count to 7 (which is the
102  * smallest infinite number :-) above.
103  * If flow control is off, we want to change this back to 0
104  * so that we learn quickly when our credit accounting is
105  * buggy.
106  *
107  * Caller passes in a qp_attr pointer - don't waste stack spacv
108  * by allocation this twice.
109  */
110 static void
111 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
112 {
113         int ret;
114 
115         attr->min_rnr_timer = IB_RNR_TIMER_000_32;
116         ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
117         if (ret)
118                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
119 }
120 
121 /*
122  * Connection established.
123  * We get here for both outgoing and incoming connection.
124  */
125 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
126 {
127         const struct rds_ib_connect_private *dp = NULL;
128         struct rds_ib_connection *ic = conn->c_transport_data;
129         struct ib_qp_attr qp_attr;
130         int err;
131 
132         if (event->param.conn.private_data_len >= sizeof(*dp)) {
133                 dp = event->param.conn.private_data;
134 
135                 /* make sure it isn't empty data */
136                 if (dp->dp_protocol_major) {
137                         rds_ib_set_protocol(conn,
138                                 RDS_PROTOCOL(dp->dp_protocol_major,
139                                 dp->dp_protocol_minor));
140                         rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
141                 }
142         }
143 
144         if (conn->c_version < RDS_PROTOCOL(3,1)) {
145                 printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed,"
146                        " no longer supported\n",
147                        &conn->c_faddr,
148                        RDS_PROTOCOL_MAJOR(conn->c_version),
149                        RDS_PROTOCOL_MINOR(conn->c_version));
150                 rds_conn_destroy(conn);
151                 return;
152         } else {
153                 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
154                        &conn->c_faddr,
155                        RDS_PROTOCOL_MAJOR(conn->c_version),
156                        RDS_PROTOCOL_MINOR(conn->c_version),
157                        ic->i_flowctl ? ", flow control" : "");
158         }
159 
160         /*
161          * Init rings and fill recv. this needs to wait until protocol negotiation
162          * is complete, since ring layout is different from 3.0 to 3.1.
163          */
164         rds_ib_send_init_ring(ic);
165         rds_ib_recv_init_ring(ic);
166         /* Post receive buffers - as a side effect, this will update
167          * the posted credit count. */
168         rds_ib_recv_refill(conn, 1);
169 
170         /* Tune RNR behavior */
171         rds_ib_tune_rnr(ic, &qp_attr);
172 
173         qp_attr.qp_state = IB_QPS_RTS;
174         err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
175         if (err)
176                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
177 
178         /* update ib_device with this local ipaddr */
179         err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
180         if (err)
181                 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
182                         err);
183 
184         /* If the peer gave us the last packet it saw, process this as if
185          * we had received a regular ACK. */
186         if (dp && dp->dp_ack_seq)
187                 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
188 
189         rds_connect_complete(conn);
190 }
191 
192 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
193                         struct rdma_conn_param *conn_param,
194                         struct rds_ib_connect_private *dp,
195                         u32 protocol_version,
196                         u32 max_responder_resources,
197                         u32 max_initiator_depth)
198 {
199         struct rds_ib_connection *ic = conn->c_transport_data;
200         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
201 
202         memset(conn_param, 0, sizeof(struct rdma_conn_param));
203 
204         conn_param->responder_resources =
205                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
206         conn_param->initiator_depth =
207                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
208         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
209         conn_param->rnr_retry_count = 7;
210 
211         if (dp) {
212                 memset(dp, 0, sizeof(*dp));
213                 dp->dp_saddr = conn->c_laddr;
214                 dp->dp_daddr = conn->c_faddr;
215                 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
216                 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
217                 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
218                 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
219 
220                 /* Advertise flow control */
221                 if (ic->i_flowctl) {
222                         unsigned int credits;
223 
224                         credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
225                         dp->dp_credit = cpu_to_be32(credits);
226                         atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
227                 }
228 
229                 conn_param->private_data = dp;
230                 conn_param->private_data_len = sizeof(*dp);
231         }
232 }
233 
234 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
235 {
236         rdsdebug("event %u (%s) data %p\n",
237                  event->event, rds_ib_event_str(event->event), data);
238 }
239 
240 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
241 {
242         struct rds_connection *conn = data;
243         struct rds_ib_connection *ic = conn->c_transport_data;
244 
245         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
246                  rds_ib_event_str(event->event));
247 
248         switch (event->event) {
249         case IB_EVENT_COMM_EST:
250                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
251                 break;
252         default:
253                 rdsdebug("Fatal QP Event %u (%s) "
254                         "- connection %pI4->%pI4, reconnecting\n",
255                         event->event, rds_ib_event_str(event->event),
256                         &conn->c_laddr, &conn->c_faddr);
257                 rds_conn_drop(conn);
258                 break;
259         }
260 }
261 
262 /*
263  * This needs to be very careful to not leave IS_ERR pointers around for
264  * cleanup to trip over.
265  */
266 static int rds_ib_setup_qp(struct rds_connection *conn)
267 {
268         struct rds_ib_connection *ic = conn->c_transport_data;
269         struct ib_device *dev = ic->i_cm_id->device;
270         struct ib_qp_init_attr attr;
271         struct rds_ib_device *rds_ibdev;
272         int ret;
273 
274         /*
275          * It's normal to see a null device if an incoming connection races
276          * with device removal, so we don't print a warning.
277          */
278         rds_ibdev = rds_ib_get_client_data(dev);
279         if (!rds_ibdev)
280                 return -EOPNOTSUPP;
281 
282         /* add the conn now so that connection establishment has the dev */
283         rds_ib_add_conn(rds_ibdev, conn);
284 
285         if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
286                 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
287         if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
288                 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
289 
290         /* Protection domain and memory range */
291         ic->i_pd = rds_ibdev->pd;
292         ic->i_mr = rds_ibdev->mr;
293 
294         ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
295                                      rds_ib_cq_event_handler, conn,
296                                      ic->i_send_ring.w_nr + 1, 0);
297         if (IS_ERR(ic->i_send_cq)) {
298                 ret = PTR_ERR(ic->i_send_cq);
299                 ic->i_send_cq = NULL;
300                 rdsdebug("ib_create_cq send failed: %d\n", ret);
301                 goto out;
302         }
303 
304         ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
305                                      rds_ib_cq_event_handler, conn,
306                                      ic->i_recv_ring.w_nr, 0);
307         if (IS_ERR(ic->i_recv_cq)) {
308                 ret = PTR_ERR(ic->i_recv_cq);
309                 ic->i_recv_cq = NULL;
310                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
311                 goto out;
312         }
313 
314         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
315         if (ret) {
316                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
317                 goto out;
318         }
319 
320         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
321         if (ret) {
322                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
323                 goto out;
324         }
325 
326         /* XXX negotiate max send/recv with remote? */
327         memset(&attr, 0, sizeof(attr));
328         attr.event_handler = rds_ib_qp_event_handler;
329         attr.qp_context = conn;
330         /* + 1 to allow for the single ack message */
331         attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
332         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
333         attr.cap.max_send_sge = rds_ibdev->max_sge;
334         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
335         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
336         attr.qp_type = IB_QPT_RC;
337         attr.send_cq = ic->i_send_cq;
338         attr.recv_cq = ic->i_recv_cq;
339 
340         /*
341          * XXX this can fail if max_*_wr is too large?  Are we supposed
342          * to back off until we get a value that the hardware can support?
343          */
344         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
345         if (ret) {
346                 rdsdebug("rdma_create_qp failed: %d\n", ret);
347                 goto out;
348         }
349 
350         ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
351                                            ic->i_send_ring.w_nr *
352                                                 sizeof(struct rds_header),
353                                            &ic->i_send_hdrs_dma, GFP_KERNEL);
354         if (!ic->i_send_hdrs) {
355                 ret = -ENOMEM;
356                 rdsdebug("ib_dma_alloc_coherent send failed\n");
357                 goto out;
358         }
359 
360         ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
361                                            ic->i_recv_ring.w_nr *
362                                                 sizeof(struct rds_header),
363                                            &ic->i_recv_hdrs_dma, GFP_KERNEL);
364         if (!ic->i_recv_hdrs) {
365                 ret = -ENOMEM;
366                 rdsdebug("ib_dma_alloc_coherent recv failed\n");
367                 goto out;
368         }
369 
370         ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
371                                        &ic->i_ack_dma, GFP_KERNEL);
372         if (!ic->i_ack) {
373                 ret = -ENOMEM;
374                 rdsdebug("ib_dma_alloc_coherent ack failed\n");
375                 goto out;
376         }
377 
378         ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
379                                    ibdev_to_node(dev));
380         if (!ic->i_sends) {
381                 ret = -ENOMEM;
382                 rdsdebug("send allocation failed\n");
383                 goto out;
384         }
385 
386         ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
387                                    ibdev_to_node(dev));
388         if (!ic->i_recvs) {
389                 ret = -ENOMEM;
390                 rdsdebug("recv allocation failed\n");
391                 goto out;
392         }
393 
394         rds_ib_recv_init_ack(ic);
395 
396         rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
397                  ic->i_send_cq, ic->i_recv_cq);
398 
399 out:
400         rds_ib_dev_put(rds_ibdev);
401         return ret;
402 }
403 
404 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
405 {
406         const struct rds_ib_connect_private *dp = event->param.conn.private_data;
407         u16 common;
408         u32 version = 0;
409 
410         /*
411          * rdma_cm private data is odd - when there is any private data in the
412          * request, we will be given a pretty large buffer without telling us the
413          * original size. The only way to tell the difference is by looking at
414          * the contents, which are initialized to zero.
415          * If the protocol version fields aren't set, this is a connection attempt
416          * from an older version. This could could be 3.0 or 2.0 - we can't tell.
417          * We really should have changed this for OFED 1.3 :-(
418          */
419 
420         /* Be paranoid. RDS always has privdata */
421         if (!event->param.conn.private_data_len) {
422                 printk(KERN_NOTICE "RDS incoming connection has no private data, "
423                         "rejecting\n");
424                 return 0;
425         }
426 
427         /* Even if len is crap *now* I still want to check it. -ASG */
428         if (event->param.conn.private_data_len < sizeof (*dp) ||
429             dp->dp_protocol_major == 0)
430                 return RDS_PROTOCOL_3_0;
431 
432         common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
433         if (dp->dp_protocol_major == 3 && common) {
434                 version = RDS_PROTOCOL_3_0;
435                 while ((common >>= 1) != 0)
436                         version++;
437         } else
438                 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
439                                 &dp->dp_saddr,
440                                 dp->dp_protocol_major,
441                                 dp->dp_protocol_minor);
442         return version;
443 }
444 
445 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
446                                     struct rdma_cm_event *event)
447 {
448         __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
449         __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
450         const struct rds_ib_connect_private *dp = event->param.conn.private_data;
451         struct rds_ib_connect_private dp_rep;
452         struct rds_connection *conn = NULL;
453         struct rds_ib_connection *ic = NULL;
454         struct rdma_conn_param conn_param;
455         u32 version;
456         int err = 1, destroy = 1;
457 
458         /* Check whether the remote protocol version matches ours. */
459         version = rds_ib_protocol_compatible(event);
460         if (!version)
461                 goto out;
462 
463         rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
464                  "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
465                  RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
466                  (unsigned long long)be64_to_cpu(lguid),
467                  (unsigned long long)be64_to_cpu(fguid));
468 
469         conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
470                                GFP_KERNEL);
471         if (IS_ERR(conn)) {
472                 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
473                 conn = NULL;
474                 goto out;
475         }
476 
477         /*
478          * The connection request may occur while the
479          * previous connection exist, e.g. in case of failover.
480          * But as connections may be initiated simultaneously
481          * by both hosts, we have a random backoff mechanism -
482          * see the comment above rds_queue_reconnect()
483          */
484         mutex_lock(&conn->c_cm_lock);
485         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
486                 if (rds_conn_state(conn) == RDS_CONN_UP) {
487                         rdsdebug("incoming connect while connecting\n");
488                         rds_conn_drop(conn);
489                         rds_ib_stats_inc(s_ib_listen_closed_stale);
490                 } else
491                 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
492                         /* Wait and see - our connect may still be succeeding */
493                         rds_ib_stats_inc(s_ib_connect_raced);
494                 }
495                 goto out;
496         }
497 
498         ic = conn->c_transport_data;
499 
500         rds_ib_set_protocol(conn, version);
501         rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
502 
503         /* If the peer gave us the last packet it saw, process this as if
504          * we had received a regular ACK. */
505         if (dp->dp_ack_seq)
506                 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
507 
508         BUG_ON(cm_id->context);
509         BUG_ON(ic->i_cm_id);
510 
511         ic->i_cm_id = cm_id;
512         cm_id->context = conn;
513 
514         /* We got halfway through setting up the ib_connection, if we
515          * fail now, we have to take the long route out of this mess. */
516         destroy = 0;
517 
518         err = rds_ib_setup_qp(conn);
519         if (err) {
520                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
521                 goto out;
522         }
523 
524         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
525                 event->param.conn.responder_resources,
526                 event->param.conn.initiator_depth);
527 
528         /* rdma_accept() calls rdma_reject() internally if it fails */
529         err = rdma_accept(cm_id, &conn_param);
530         if (err)
531                 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
532 
533 out:
534         if (conn)
535                 mutex_unlock(&conn->c_cm_lock);
536         if (err)
537                 rdma_reject(cm_id, NULL, 0);
538         return destroy;
539 }
540 
541 
542 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
543 {
544         struct rds_connection *conn = cm_id->context;
545         struct rds_ib_connection *ic = conn->c_transport_data;
546         struct rdma_conn_param conn_param;
547         struct rds_ib_connect_private dp;
548         int ret;
549 
550         /* If the peer doesn't do protocol negotiation, we must
551          * default to RDSv3.0 */
552         rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
553         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
554 
555         ret = rds_ib_setup_qp(conn);
556         if (ret) {
557                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
558                 goto out;
559         }
560 
561         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
562                 UINT_MAX, UINT_MAX);
563         ret = rdma_connect(cm_id, &conn_param);
564         if (ret)
565                 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
566 
567 out:
568         /* Beware - returning non-zero tells the rdma_cm to destroy
569          * the cm_id. We should certainly not do it as long as we still
570          * "own" the cm_id. */
571         if (ret) {
572                 if (ic->i_cm_id == cm_id)
573                         ret = 0;
574         }
575         return ret;
576 }
577 
578 int rds_ib_conn_connect(struct rds_connection *conn)
579 {
580         struct rds_ib_connection *ic = conn->c_transport_data;
581         struct sockaddr_in src, dest;
582         int ret;
583 
584         /* XXX I wonder what affect the port space has */
585         /* delegate cm event handler to rdma_transport */
586         ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
587                                      RDMA_PS_TCP, IB_QPT_RC);
588         if (IS_ERR(ic->i_cm_id)) {
589                 ret = PTR_ERR(ic->i_cm_id);
590                 ic->i_cm_id = NULL;
591                 rdsdebug("rdma_create_id() failed: %d\n", ret);
592                 goto out;
593         }
594 
595         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
596 
597         src.sin_family = AF_INET;
598         src.sin_addr.s_addr = (__force u32)conn->c_laddr;
599         src.sin_port = (__force u16)htons(0);
600 
601         dest.sin_family = AF_INET;
602         dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
603         dest.sin_port = (__force u16)htons(RDS_PORT);
604 
605         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
606                                 (struct sockaddr *)&dest,
607                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
608         if (ret) {
609                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
610                          ret);
611                 rdma_destroy_id(ic->i_cm_id);
612                 ic->i_cm_id = NULL;
613         }
614 
615 out:
616         return ret;
617 }
618 
619 /*
620  * This is so careful about only cleaning up resources that were built up
621  * so that it can be called at any point during startup.  In fact it
622  * can be called multiple times for a given connection.
623  */
624 void rds_ib_conn_shutdown(struct rds_connection *conn)
625 {
626         struct rds_ib_connection *ic = conn->c_transport_data;
627         int err = 0;
628 
629         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
630                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
631                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
632 
633         if (ic->i_cm_id) {
634                 struct ib_device *dev = ic->i_cm_id->device;
635 
636                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
637                 err = rdma_disconnect(ic->i_cm_id);
638                 if (err) {
639                         /* Actually this may happen quite frequently, when
640                          * an outgoing connect raced with an incoming connect.
641                          */
642                         rdsdebug("failed to disconnect, cm: %p err %d\n",
643                                 ic->i_cm_id, err);
644                 }
645 
646                 /*
647                  * We want to wait for tx and rx completion to finish
648                  * before we tear down the connection, but we have to be
649                  * careful not to get stuck waiting on a send ring that
650                  * only has unsignaled sends in it.  We've shutdown new
651                  * sends before getting here so by waiting for signaled
652                  * sends to complete we're ensured that there will be no
653                  * more tx processing.
654                  */
655                 wait_event(rds_ib_ring_empty_wait,
656                            rds_ib_ring_empty(&ic->i_recv_ring) &&
657                            (atomic_read(&ic->i_signaled_sends) == 0));
658                 tasklet_kill(&ic->i_recv_tasklet);
659 
660                 if (ic->i_send_hdrs)
661                         ib_dma_free_coherent(dev,
662                                            ic->i_send_ring.w_nr *
663                                                 sizeof(struct rds_header),
664                                            ic->i_send_hdrs,
665                                            ic->i_send_hdrs_dma);
666 
667                 if (ic->i_recv_hdrs)
668                         ib_dma_free_coherent(dev,
669                                            ic->i_recv_ring.w_nr *
670                                                 sizeof(struct rds_header),
671                                            ic->i_recv_hdrs,
672                                            ic->i_recv_hdrs_dma);
673 
674                 if (ic->i_ack)
675                         ib_dma_free_coherent(dev, sizeof(struct rds_header),
676                                              ic->i_ack, ic->i_ack_dma);
677 
678                 if (ic->i_sends)
679                         rds_ib_send_clear_ring(ic);
680                 if (ic->i_recvs)
681                         rds_ib_recv_clear_ring(ic);
682 
683                 if (ic->i_cm_id->qp)
684                         rdma_destroy_qp(ic->i_cm_id);
685                 if (ic->i_send_cq)
686                         ib_destroy_cq(ic->i_send_cq);
687                 if (ic->i_recv_cq)
688                         ib_destroy_cq(ic->i_recv_cq);
689                 rdma_destroy_id(ic->i_cm_id);
690 
691                 /*
692                  * Move connection back to the nodev list.
693                  */
694                 if (ic->rds_ibdev)
695                         rds_ib_remove_conn(ic->rds_ibdev, conn);
696 
697                 ic->i_cm_id = NULL;
698                 ic->i_pd = NULL;
699                 ic->i_mr = NULL;
700                 ic->i_send_cq = NULL;
701                 ic->i_recv_cq = NULL;
702                 ic->i_send_hdrs = NULL;
703                 ic->i_recv_hdrs = NULL;
704                 ic->i_ack = NULL;
705         }
706         BUG_ON(ic->rds_ibdev);
707 
708         /* Clear pending transmit */
709         if (ic->i_data_op) {
710                 struct rds_message *rm;
711 
712                 rm = container_of(ic->i_data_op, struct rds_message, data);
713                 rds_message_put(rm);
714                 ic->i_data_op = NULL;
715         }
716 
717         /* Clear the ACK state */
718         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
719 #ifdef KERNEL_HAS_ATOMIC64
720         atomic64_set(&ic->i_ack_next, 0);
721 #else
722         ic->i_ack_next = 0;
723 #endif
724         ic->i_ack_recv = 0;
725 
726         /* Clear flow control state */
727         ic->i_flowctl = 0;
728         atomic_set(&ic->i_credits, 0);
729 
730         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
731         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
732 
733         if (ic->i_ibinc) {
734                 rds_inc_put(&ic->i_ibinc->ii_inc);
735                 ic->i_ibinc = NULL;
736         }
737 
738         vfree(ic->i_sends);
739         ic->i_sends = NULL;
740         vfree(ic->i_recvs);
741         ic->i_recvs = NULL;
742 }
743 
744 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
745 {
746         struct rds_ib_connection *ic;
747         unsigned long flags;
748         int ret;
749 
750         /* XXX too lazy? */
751         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
752         if (!ic)
753                 return -ENOMEM;
754 
755         ret = rds_ib_recv_alloc_caches(ic);
756         if (ret) {
757                 kfree(ic);
758                 return ret;
759         }
760 
761         INIT_LIST_HEAD(&ic->ib_node);
762         tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
763                      (unsigned long) ic);
764         mutex_init(&ic->i_recv_mutex);
765 #ifndef KERNEL_HAS_ATOMIC64
766         spin_lock_init(&ic->i_ack_lock);
767 #endif
768         atomic_set(&ic->i_signaled_sends, 0);
769 
770         /*
771          * rds_ib_conn_shutdown() waits for these to be emptied so they
772          * must be initialized before it can be called.
773          */
774         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
775         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
776 
777         ic->conn = conn;
778         conn->c_transport_data = ic;
779 
780         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
781         list_add_tail(&ic->ib_node, &ib_nodev_conns);
782         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
783 
784 
785         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
786         return 0;
787 }
788 
789 /*
790  * Free a connection. Connection must be shut down and not set for reconnect.
791  */
792 void rds_ib_conn_free(void *arg)
793 {
794         struct rds_ib_connection *ic = arg;
795         spinlock_t      *lock_ptr;
796 
797         rdsdebug("ic %p\n", ic);
798 
799         /*
800          * Conn is either on a dev's list or on the nodev list.
801          * A race with shutdown() or connect() would cause problems
802          * (since rds_ibdev would change) but that should never happen.
803          */
804         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
805 
806         spin_lock_irq(lock_ptr);
807         list_del(&ic->ib_node);
808         spin_unlock_irq(lock_ptr);
809 
810         rds_ib_recv_free_caches(ic);
811 
812         kfree(ic);
813 }
814 
815 
816 /*
817  * An error occurred on the connection
818  */
819 void
820 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
821 {
822         va_list ap;
823 
824         rds_conn_drop(conn);
825 
826         va_start(ap, fmt);
827         vprintk(fmt, ap);
828         va_end(ap);
829 }
830 

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