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

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  1 /*
  2  * Copyright (c) 2006, 2018 Oracle and/or its affiliates. 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 #include <net/addrconf.h>
 39 
 40 #include "rds_single_path.h"
 41 #include "rds.h"
 42 #include "ib.h"
 43 #include "ib_mr.h"
 44 
 45 /*
 46  * Set the selected protocol version
 47  */
 48 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
 49 {
 50         conn->c_version = version;
 51 }
 52 
 53 /*
 54  * Set up flow control
 55  */
 56 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
 57 {
 58         struct rds_ib_connection *ic = conn->c_transport_data;
 59 
 60         if (rds_ib_sysctl_flow_control && credits != 0) {
 61                 /* We're doing flow control */
 62                 ic->i_flowctl = 1;
 63                 rds_ib_send_add_credits(conn, credits);
 64         } else {
 65                 ic->i_flowctl = 0;
 66         }
 67 }
 68 
 69 /*
 70  * Tune RNR behavior. Without flow control, we use a rather
 71  * low timeout, but not the absolute minimum - this should
 72  * be tunable.
 73  *
 74  * We already set the RNR retry count to 7 (which is the
 75  * smallest infinite number :-) above.
 76  * If flow control is off, we want to change this back to 0
 77  * so that we learn quickly when our credit accounting is
 78  * buggy.
 79  *
 80  * Caller passes in a qp_attr pointer - don't waste stack spacv
 81  * by allocation this twice.
 82  */
 83 static void
 84 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
 85 {
 86         int ret;
 87 
 88         attr->min_rnr_timer = IB_RNR_TIMER_000_32;
 89         ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
 90         if (ret)
 91                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
 92 }
 93 
 94 /*
 95  * Connection established.
 96  * We get here for both outgoing and incoming connection.
 97  */
 98 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
 99 {
100         struct rds_ib_connection *ic = conn->c_transport_data;
101         const union rds_ib_conn_priv *dp = NULL;
102         struct ib_qp_attr qp_attr;
103         __be64 ack_seq = 0;
104         __be32 credit = 0;
105         u8 major = 0;
106         u8 minor = 0;
107         int err;
108 
109         dp = event->param.conn.private_data;
110         if (conn->c_isv6) {
111                 if (event->param.conn.private_data_len >=
112                     sizeof(struct rds6_ib_connect_private)) {
113                         major = dp->ricp_v6.dp_protocol_major;
114                         minor = dp->ricp_v6.dp_protocol_minor;
115                         credit = dp->ricp_v6.dp_credit;
116                         /* dp structure start is not guaranteed to be 8 bytes
117                          * aligned.  Since dp_ack_seq is 64-bit extended load
118                          * operations can be used so go through get_unaligned
119                          * to avoid unaligned errors.
120                          */
121                         ack_seq = get_unaligned(&dp->ricp_v6.dp_ack_seq);
122                 }
123         } else if (event->param.conn.private_data_len >=
124                    sizeof(struct rds_ib_connect_private)) {
125                 major = dp->ricp_v4.dp_protocol_major;
126                 minor = dp->ricp_v4.dp_protocol_minor;
127                 credit = dp->ricp_v4.dp_credit;
128                 ack_seq = get_unaligned(&dp->ricp_v4.dp_ack_seq);
129         }
130 
131         /* make sure it isn't empty data */
132         if (major) {
133                 rds_ib_set_protocol(conn, RDS_PROTOCOL(major, minor));
134                 rds_ib_set_flow_control(conn, be32_to_cpu(credit));
135         }
136 
137         if (conn->c_version < RDS_PROTOCOL_VERSION) {
138                 if (conn->c_version != RDS_PROTOCOL_COMPAT_VERSION) {
139                         pr_notice("RDS/IB: Connection <%pI6c,%pI6c> version %u.%u no longer supported\n",
140                                   &conn->c_laddr, &conn->c_faddr,
141                                   RDS_PROTOCOL_MAJOR(conn->c_version),
142                                   RDS_PROTOCOL_MINOR(conn->c_version));
143                         rds_conn_destroy(conn);
144                         return;
145                 }
146         }
147 
148         pr_notice("RDS/IB: %s conn connected <%pI6c,%pI6c,%d> version %u.%u%s\n",
149                   ic->i_active_side ? "Active" : "Passive",
150                   &conn->c_laddr, &conn->c_faddr, conn->c_tos,
151                   RDS_PROTOCOL_MAJOR(conn->c_version),
152                   RDS_PROTOCOL_MINOR(conn->c_version),
153                   ic->i_flowctl ? ", flow control" : "");
154 
155         /* receive sl from the peer */
156         ic->i_sl = ic->i_cm_id->route.path_rec->sl;
157 
158         atomic_set(&ic->i_cq_quiesce, 0);
159 
160         /* Init rings and fill recv. this needs to wait until protocol
161          * negotiation is complete, since ring layout is different
162          * from 3.1 to 4.1.
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, GFP_KERNEL);
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) {
187                 if (ack_seq)
188                         rds_send_drop_acked(conn, be64_to_cpu(ack_seq),
189                                             NULL);
190         }
191 
192         conn->c_proposed_version = conn->c_version;
193         rds_connect_complete(conn);
194 }
195 
196 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
197                                       struct rdma_conn_param *conn_param,
198                                       union rds_ib_conn_priv *dp,
199                                       u32 protocol_version,
200                                       u32 max_responder_resources,
201                                       u32 max_initiator_depth,
202                                       bool isv6)
203 {
204         struct rds_ib_connection *ic = conn->c_transport_data;
205         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
206 
207         memset(conn_param, 0, sizeof(struct rdma_conn_param));
208 
209         conn_param->responder_resources =
210                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
211         conn_param->initiator_depth =
212                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
213         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
214         conn_param->rnr_retry_count = 7;
215 
216         if (dp) {
217                 memset(dp, 0, sizeof(*dp));
218                 if (isv6) {
219                         dp->ricp_v6.dp_saddr = conn->c_laddr;
220                         dp->ricp_v6.dp_daddr = conn->c_faddr;
221                         dp->ricp_v6.dp_protocol_major =
222                             RDS_PROTOCOL_MAJOR(protocol_version);
223                         dp->ricp_v6.dp_protocol_minor =
224                             RDS_PROTOCOL_MINOR(protocol_version);
225                         dp->ricp_v6.dp_protocol_minor_mask =
226                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
227                         dp->ricp_v6.dp_ack_seq =
228                             cpu_to_be64(rds_ib_piggyb_ack(ic));
229                         dp->ricp_v6.dp_cmn.ricpc_dp_toss = conn->c_tos;
230 
231                         conn_param->private_data = &dp->ricp_v6;
232                         conn_param->private_data_len = sizeof(dp->ricp_v6);
233                 } else {
234                         dp->ricp_v4.dp_saddr = conn->c_laddr.s6_addr32[3];
235                         dp->ricp_v4.dp_daddr = conn->c_faddr.s6_addr32[3];
236                         dp->ricp_v4.dp_protocol_major =
237                             RDS_PROTOCOL_MAJOR(protocol_version);
238                         dp->ricp_v4.dp_protocol_minor =
239                             RDS_PROTOCOL_MINOR(protocol_version);
240                         dp->ricp_v4.dp_protocol_minor_mask =
241                             cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
242                         dp->ricp_v4.dp_ack_seq =
243                             cpu_to_be64(rds_ib_piggyb_ack(ic));
244                         dp->ricp_v4.dp_cmn.ricpc_dp_toss = conn->c_tos;
245 
246                         conn_param->private_data = &dp->ricp_v4;
247                         conn_param->private_data_len = sizeof(dp->ricp_v4);
248                 }
249 
250                 /* Advertise flow control */
251                 if (ic->i_flowctl) {
252                         unsigned int credits;
253 
254                         credits = IB_GET_POST_CREDITS
255                                 (atomic_read(&ic->i_credits));
256                         if (isv6)
257                                 dp->ricp_v6.dp_credit = cpu_to_be32(credits);
258                         else
259                                 dp->ricp_v4.dp_credit = cpu_to_be32(credits);
260                         atomic_sub(IB_SET_POST_CREDITS(credits),
261                                    &ic->i_credits);
262                 }
263         }
264 }
265 
266 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
267 {
268         rdsdebug("event %u (%s) data %p\n",
269                  event->event, ib_event_msg(event->event), data);
270 }
271 
272 /* Plucking the oldest entry from the ring can be done concurrently with
273  * the thread refilling the ring.  Each ring operation is protected by
274  * spinlocks and the transient state of refilling doesn't change the
275  * recording of which entry is oldest.
276  *
277  * This relies on IB only calling one cq comp_handler for each cq so that
278  * there will only be one caller of rds_recv_incoming() per RDS connection.
279  */
280 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
281 {
282         struct rds_connection *conn = context;
283         struct rds_ib_connection *ic = conn->c_transport_data;
284 
285         rdsdebug("conn %p cq %p\n", conn, cq);
286 
287         rds_ib_stats_inc(s_ib_evt_handler_call);
288 
289         tasklet_schedule(&ic->i_recv_tasklet);
290 }
291 
292 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
293                      struct ib_wc *wcs)
294 {
295         int nr, i;
296         struct ib_wc *wc;
297 
298         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
299                 for (i = 0; i < nr; i++) {
300                         wc = wcs + i;
301                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
302                                  (unsigned long long)wc->wr_id, wc->status,
303                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
304 
305                         if (wc->wr_id <= ic->i_send_ring.w_nr ||
306                             wc->wr_id == RDS_IB_ACK_WR_ID)
307                                 rds_ib_send_cqe_handler(ic, wc);
308                         else
309                                 rds_ib_mr_cqe_handler(ic, wc);
310 
311                 }
312         }
313 }
314 
315 static void rds_ib_tasklet_fn_send(unsigned long data)
316 {
317         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
318         struct rds_connection *conn = ic->conn;
319 
320         rds_ib_stats_inc(s_ib_tasklet_call);
321 
322         /* if cq has been already reaped, ignore incoming cq event */
323         if (atomic_read(&ic->i_cq_quiesce))
324                 return;
325 
326         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
327         ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
328         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
329 
330         if (rds_conn_up(conn) &&
331             (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
332             test_bit(0, &conn->c_map_queued)))
333                 rds_send_xmit(&ic->conn->c_path[0]);
334 }
335 
336 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
337                      struct ib_wc *wcs,
338                      struct rds_ib_ack_state *ack_state)
339 {
340         int nr, i;
341         struct ib_wc *wc;
342 
343         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
344                 for (i = 0; i < nr; i++) {
345                         wc = wcs + i;
346                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
347                                  (unsigned long long)wc->wr_id, wc->status,
348                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
349 
350                         rds_ib_recv_cqe_handler(ic, wc, ack_state);
351                 }
352         }
353 }
354 
355 static void rds_ib_tasklet_fn_recv(unsigned long data)
356 {
357         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
358         struct rds_connection *conn = ic->conn;
359         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
360         struct rds_ib_ack_state state;
361 
362         if (!rds_ibdev)
363                 rds_conn_drop(conn);
364 
365         rds_ib_stats_inc(s_ib_tasklet_call);
366 
367         /* if cq has been already reaped, ignore incoming cq event */
368         if (atomic_read(&ic->i_cq_quiesce))
369                 return;
370 
371         memset(&state, 0, sizeof(state));
372         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
373         ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
374         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
375 
376         if (state.ack_next_valid)
377                 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
378         if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
379                 rds_send_drop_acked(conn, state.ack_recv, NULL);
380                 ic->i_ack_recv = state.ack_recv;
381         }
382 
383         if (rds_conn_up(conn))
384                 rds_ib_attempt_ack(ic);
385 }
386 
387 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
388 {
389         struct rds_connection *conn = data;
390         struct rds_ib_connection *ic = conn->c_transport_data;
391 
392         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
393                  ib_event_msg(event->event));
394 
395         switch (event->event) {
396         case IB_EVENT_COMM_EST:
397                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
398                 break;
399         default:
400                 rdsdebug("Fatal QP Event %u (%s) - connection %pI6c->%pI6c, reconnecting\n",
401                          event->event, ib_event_msg(event->event),
402                          &conn->c_laddr, &conn->c_faddr);
403                 rds_conn_drop(conn);
404                 break;
405         }
406 }
407 
408 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
409 {
410         struct rds_connection *conn = context;
411         struct rds_ib_connection *ic = conn->c_transport_data;
412 
413         rdsdebug("conn %p cq %p\n", conn, cq);
414 
415         rds_ib_stats_inc(s_ib_evt_handler_call);
416 
417         tasklet_schedule(&ic->i_send_tasklet);
418 }
419 
420 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev)
421 {
422         int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1];
423         int index = rds_ibdev->dev->num_comp_vectors - 1;
424         int i;
425 
426         for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) {
427                 if (rds_ibdev->vector_load[i] < min) {
428                         index = i;
429                         min = rds_ibdev->vector_load[i];
430                 }
431         }
432 
433         rds_ibdev->vector_load[index]++;
434         return index;
435 }
436 
437 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index)
438 {
439         rds_ibdev->vector_load[index]--;
440 }
441 
442 /*
443  * This needs to be very careful to not leave IS_ERR pointers around for
444  * cleanup to trip over.
445  */
446 static int rds_ib_setup_qp(struct rds_connection *conn)
447 {
448         struct rds_ib_connection *ic = conn->c_transport_data;
449         struct ib_device *dev = ic->i_cm_id->device;
450         struct ib_qp_init_attr attr;
451         struct ib_cq_init_attr cq_attr = {};
452         struct rds_ib_device *rds_ibdev;
453         int ret, fr_queue_space;
454 
455         /*
456          * It's normal to see a null device if an incoming connection races
457          * with device removal, so we don't print a warning.
458          */
459         rds_ibdev = rds_ib_get_client_data(dev);
460         if (!rds_ibdev)
461                 return -EOPNOTSUPP;
462 
463         /* The fr_queue_space is currently set to 512, to add extra space on
464          * completion queue and send queue. This extra space is used for FRMR
465          * registration and invalidation work requests
466          */
467         fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
468 
469         /* add the conn now so that connection establishment has the dev */
470         rds_ib_add_conn(rds_ibdev, conn);
471 
472         if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
473                 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
474         if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
475                 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
476 
477         /* Protection domain and memory range */
478         ic->i_pd = rds_ibdev->pd;
479 
480         ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev);
481         cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
482         cq_attr.comp_vector = ic->i_scq_vector;
483         ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
484                                      rds_ib_cq_event_handler, conn,
485                                      &cq_attr);
486         if (IS_ERR(ic->i_send_cq)) {
487                 ret = PTR_ERR(ic->i_send_cq);
488                 ic->i_send_cq = NULL;
489                 ibdev_put_vector(rds_ibdev, ic->i_scq_vector);
490                 rdsdebug("ib_create_cq send failed: %d\n", ret);
491                 goto rds_ibdev_out;
492         }
493 
494         ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev);
495         cq_attr.cqe = ic->i_recv_ring.w_nr;
496         cq_attr.comp_vector = ic->i_rcq_vector;
497         ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
498                                      rds_ib_cq_event_handler, conn,
499                                      &cq_attr);
500         if (IS_ERR(ic->i_recv_cq)) {
501                 ret = PTR_ERR(ic->i_recv_cq);
502                 ic->i_recv_cq = NULL;
503                 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector);
504                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
505                 goto send_cq_out;
506         }
507 
508         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
509         if (ret) {
510                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
511                 goto recv_cq_out;
512         }
513 
514         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
515         if (ret) {
516                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
517                 goto recv_cq_out;
518         }
519 
520         /* XXX negotiate max send/recv with remote? */
521         memset(&attr, 0, sizeof(attr));
522         attr.event_handler = rds_ib_qp_event_handler;
523         attr.qp_context = conn;
524         /* + 1 to allow for the single ack message */
525         attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
526         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
527         attr.cap.max_send_sge = rds_ibdev->max_sge;
528         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
529         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
530         attr.qp_type = IB_QPT_RC;
531         attr.send_cq = ic->i_send_cq;
532         attr.recv_cq = ic->i_recv_cq;
533 
534         /*
535          * XXX this can fail if max_*_wr is too large?  Are we supposed
536          * to back off until we get a value that the hardware can support?
537          */
538         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
539         if (ret) {
540                 rdsdebug("rdma_create_qp failed: %d\n", ret);
541                 goto recv_cq_out;
542         }
543 
544         ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
545                                            ic->i_send_ring.w_nr *
546                                                 sizeof(struct rds_header),
547                                            &ic->i_send_hdrs_dma, GFP_KERNEL);
548         if (!ic->i_send_hdrs) {
549                 ret = -ENOMEM;
550                 rdsdebug("ib_dma_alloc_coherent send failed\n");
551                 goto qp_out;
552         }
553 
554         ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
555                                            ic->i_recv_ring.w_nr *
556                                                 sizeof(struct rds_header),
557                                            &ic->i_recv_hdrs_dma, GFP_KERNEL);
558         if (!ic->i_recv_hdrs) {
559                 ret = -ENOMEM;
560                 rdsdebug("ib_dma_alloc_coherent recv failed\n");
561                 goto send_hdrs_dma_out;
562         }
563 
564         ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
565                                        &ic->i_ack_dma, GFP_KERNEL);
566         if (!ic->i_ack) {
567                 ret = -ENOMEM;
568                 rdsdebug("ib_dma_alloc_coherent ack failed\n");
569                 goto recv_hdrs_dma_out;
570         }
571 
572         ic->i_sends = vzalloc_node(array_size(sizeof(struct rds_ib_send_work),
573                                               ic->i_send_ring.w_nr),
574                                    ibdev_to_node(dev));
575         if (!ic->i_sends) {
576                 ret = -ENOMEM;
577                 rdsdebug("send allocation failed\n");
578                 goto ack_dma_out;
579         }
580 
581         ic->i_recvs = vzalloc_node(array_size(sizeof(struct rds_ib_recv_work),
582                                               ic->i_recv_ring.w_nr),
583                                    ibdev_to_node(dev));
584         if (!ic->i_recvs) {
585                 ret = -ENOMEM;
586                 rdsdebug("recv allocation failed\n");
587                 goto sends_out;
588         }
589 
590         rds_ib_recv_init_ack(ic);
591 
592         rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
593                  ic->i_send_cq, ic->i_recv_cq);
594 
595         goto out;
596 
597 sends_out:
598         vfree(ic->i_sends);
599 ack_dma_out:
600         ib_dma_free_coherent(dev, sizeof(struct rds_header),
601                              ic->i_ack, ic->i_ack_dma);
602 recv_hdrs_dma_out:
603         ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr *
604                                         sizeof(struct rds_header),
605                                         ic->i_recv_hdrs, ic->i_recv_hdrs_dma);
606 send_hdrs_dma_out:
607         ib_dma_free_coherent(dev, ic->i_send_ring.w_nr *
608                                         sizeof(struct rds_header),
609                                         ic->i_send_hdrs, ic->i_send_hdrs_dma);
610 qp_out:
611         rdma_destroy_qp(ic->i_cm_id);
612 recv_cq_out:
613         ib_destroy_cq(ic->i_recv_cq);
614         ic->i_recv_cq = NULL;
615 send_cq_out:
616         ib_destroy_cq(ic->i_send_cq);
617         ic->i_send_cq = NULL;
618 rds_ibdev_out:
619         rds_ib_remove_conn(rds_ibdev, conn);
620 out:
621         rds_ib_dev_put(rds_ibdev);
622 
623         return ret;
624 }
625 
626 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event, bool isv6)
627 {
628         const union rds_ib_conn_priv *dp = event->param.conn.private_data;
629         u8 data_len, major, minor;
630         u32 version = 0;
631         __be16 mask;
632         u16 common;
633 
634         /*
635          * rdma_cm private data is odd - when there is any private data in the
636          * request, we will be given a pretty large buffer without telling us the
637          * original size. The only way to tell the difference is by looking at
638          * the contents, which are initialized to zero.
639          * If the protocol version fields aren't set, this is a connection attempt
640          * from an older version. This could could be 3.0 or 2.0 - we can't tell.
641          * We really should have changed this for OFED 1.3 :-(
642          */
643 
644         /* Be paranoid. RDS always has privdata */
645         if (!event->param.conn.private_data_len) {
646                 printk(KERN_NOTICE "RDS incoming connection has no private data, "
647                         "rejecting\n");
648                 return 0;
649         }
650 
651         if (isv6) {
652                 data_len = sizeof(struct rds6_ib_connect_private);
653                 major = dp->ricp_v6.dp_protocol_major;
654                 minor = dp->ricp_v6.dp_protocol_minor;
655                 mask = dp->ricp_v6.dp_protocol_minor_mask;
656         } else {
657                 data_len = sizeof(struct rds_ib_connect_private);
658                 major = dp->ricp_v4.dp_protocol_major;
659                 minor = dp->ricp_v4.dp_protocol_minor;
660                 mask = dp->ricp_v4.dp_protocol_minor_mask;
661         }
662 
663         /* Even if len is crap *now* I still want to check it. -ASG */
664         if (event->param.conn.private_data_len < data_len || major == 0)
665                 return RDS_PROTOCOL_4_0;
666 
667         common = be16_to_cpu(mask) & RDS_IB_SUPPORTED_PROTOCOLS;
668         if (major == 4 && common) {
669                 version = RDS_PROTOCOL_4_0;
670                 while ((common >>= 1) != 0)
671                         version++;
672         } else if (RDS_PROTOCOL_COMPAT_VERSION ==
673                    RDS_PROTOCOL(major, minor)) {
674                 version = RDS_PROTOCOL_COMPAT_VERSION;
675         } else {
676                 if (isv6)
677                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI6c using incompatible protocol version %u.%u\n",
678                                            &dp->ricp_v6.dp_saddr, major, minor);
679                 else
680                         printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
681                                            &dp->ricp_v4.dp_saddr, major, minor);
682         }
683         return version;
684 }
685 
686 #if IS_ENABLED(CONFIG_IPV6)
687 /* Given an IPv6 address, find the net_device which hosts that address and
688  * return its index.  This is used by the rds_ib_cm_handle_connect() code to
689  * find the interface index of where an incoming request comes from when
690  * the request is using a link local address.
691  *
692  * Note one problem in this search.  It is possible that two interfaces have
693  * the same link local address.  Unfortunately, this cannot be solved unless
694  * the underlying layer gives us the interface which an incoming RDMA connect
695  * request comes from.
696  */
697 static u32 __rds_find_ifindex(struct net *net, const struct in6_addr *addr)
698 {
699         struct net_device *dev;
700         int idx = 0;
701 
702         rcu_read_lock();
703         for_each_netdev_rcu(net, dev) {
704                 if (ipv6_chk_addr(net, addr, dev, 1)) {
705                         idx = dev->ifindex;
706                         break;
707                 }
708         }
709         rcu_read_unlock();
710 
711         return idx;
712 }
713 #endif
714 
715 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
716                              struct rdma_cm_event *event, bool isv6)
717 {
718         __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
719         __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
720         const struct rds_ib_conn_priv_cmn *dp_cmn;
721         struct rds_connection *conn = NULL;
722         struct rds_ib_connection *ic = NULL;
723         struct rdma_conn_param conn_param;
724         const union rds_ib_conn_priv *dp;
725         union rds_ib_conn_priv dp_rep;
726         struct in6_addr s_mapped_addr;
727         struct in6_addr d_mapped_addr;
728         const struct in6_addr *saddr6;
729         const struct in6_addr *daddr6;
730         int destroy = 1;
731         u32 ifindex = 0;
732         u32 version;
733         int err = 1;
734 
735         /* Check whether the remote protocol version matches ours. */
736         version = rds_ib_protocol_compatible(event, isv6);
737         if (!version) {
738                 err = RDS_RDMA_REJ_INCOMPAT;
739                 goto out;
740         }
741 
742         dp = event->param.conn.private_data;
743         if (isv6) {
744 #if IS_ENABLED(CONFIG_IPV6)
745                 dp_cmn = &dp->ricp_v6.dp_cmn;
746                 saddr6 = &dp->ricp_v6.dp_saddr;
747                 daddr6 = &dp->ricp_v6.dp_daddr;
748                 /* If either address is link local, need to find the
749                  * interface index in order to create a proper RDS
750                  * connection.
751                  */
752                 if (ipv6_addr_type(daddr6) & IPV6_ADDR_LINKLOCAL) {
753                         /* Using init_net for now ..  */
754                         ifindex = __rds_find_ifindex(&init_net, daddr6);
755                         /* No index found...  Need to bail out. */
756                         if (ifindex == 0) {
757                                 err = -EOPNOTSUPP;
758                                 goto out;
759                         }
760                 } else if (ipv6_addr_type(saddr6) & IPV6_ADDR_LINKLOCAL) {
761                         /* Use our address to find the correct index. */
762                         ifindex = __rds_find_ifindex(&init_net, daddr6);
763                         /* No index found...  Need to bail out. */
764                         if (ifindex == 0) {
765                                 err = -EOPNOTSUPP;
766                                 goto out;
767                         }
768                 }
769 #else
770                 err = -EOPNOTSUPP;
771                 goto out;
772 #endif
773         } else {
774                 dp_cmn = &dp->ricp_v4.dp_cmn;
775                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_saddr, &s_mapped_addr);
776                 ipv6_addr_set_v4mapped(dp->ricp_v4.dp_daddr, &d_mapped_addr);
777                 saddr6 = &s_mapped_addr;
778                 daddr6 = &d_mapped_addr;
779         }
780 
781         rdsdebug("saddr %pI6c daddr %pI6c RDSv%u.%u lguid 0x%llx fguid 0x%llx, tos:%d\n",
782                  saddr6, daddr6, RDS_PROTOCOL_MAJOR(version),
783                  RDS_PROTOCOL_MINOR(version),
784                  (unsigned long long)be64_to_cpu(lguid),
785                  (unsigned long long)be64_to_cpu(fguid), dp_cmn->ricpc_dp_toss);
786 
787         /* RDS/IB is not currently netns aware, thus init_net */
788         conn = rds_conn_create(&init_net, daddr6, saddr6,
789                                &rds_ib_transport, dp_cmn->ricpc_dp_toss,
790                                GFP_KERNEL, ifindex);
791         if (IS_ERR(conn)) {
792                 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
793                 conn = NULL;
794                 goto out;
795         }
796 
797         /*
798          * The connection request may occur while the
799          * previous connection exist, e.g. in case of failover.
800          * But as connections may be initiated simultaneously
801          * by both hosts, we have a random backoff mechanism -
802          * see the comment above rds_queue_reconnect()
803          */
804         mutex_lock(&conn->c_cm_lock);
805         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
806                 if (rds_conn_state(conn) == RDS_CONN_UP) {
807                         rdsdebug("incoming connect while connecting\n");
808                         rds_conn_drop(conn);
809                         rds_ib_stats_inc(s_ib_listen_closed_stale);
810                 } else
811                 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
812                         /* Wait and see - our connect may still be succeeding */
813                         rds_ib_stats_inc(s_ib_connect_raced);
814                 }
815                 goto out;
816         }
817 
818         ic = conn->c_transport_data;
819 
820         rds_ib_set_protocol(conn, version);
821         rds_ib_set_flow_control(conn, be32_to_cpu(dp_cmn->ricpc_credit));
822 
823         /* If the peer gave us the last packet it saw, process this as if
824          * we had received a regular ACK. */
825         if (dp_cmn->ricpc_ack_seq)
826                 rds_send_drop_acked(conn, be64_to_cpu(dp_cmn->ricpc_ack_seq),
827                                     NULL);
828 
829         BUG_ON(cm_id->context);
830         BUG_ON(ic->i_cm_id);
831 
832         ic->i_cm_id = cm_id;
833         cm_id->context = conn;
834 
835         /* We got halfway through setting up the ib_connection, if we
836          * fail now, we have to take the long route out of this mess. */
837         destroy = 0;
838 
839         err = rds_ib_setup_qp(conn);
840         if (err) {
841                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
842                 goto out;
843         }
844 
845         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
846                                   event->param.conn.responder_resources,
847                                   event->param.conn.initiator_depth, isv6);
848 
849         /* rdma_accept() calls rdma_reject() internally if it fails */
850         if (rdma_accept(cm_id, &conn_param))
851                 rds_ib_conn_error(conn, "rdma_accept failed\n");
852 
853 out:
854         if (conn)
855                 mutex_unlock(&conn->c_cm_lock);
856         if (err)
857                 rdma_reject(cm_id, &err, sizeof(int));
858         return destroy;
859 }
860 
861 
862 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6)
863 {
864         struct rds_connection *conn = cm_id->context;
865         struct rds_ib_connection *ic = conn->c_transport_data;
866         struct rdma_conn_param conn_param;
867         union rds_ib_conn_priv dp;
868         int ret;
869 
870         /* If the peer doesn't do protocol negotiation, we must
871          * default to RDSv3.0 */
872         rds_ib_set_protocol(conn, RDS_PROTOCOL_4_1);
873         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
874 
875         ret = rds_ib_setup_qp(conn);
876         if (ret) {
877                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
878                 goto out;
879         }
880 
881         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp,
882                                   conn->c_proposed_version,
883                                   UINT_MAX, UINT_MAX, isv6);
884         ret = rdma_connect(cm_id, &conn_param);
885         if (ret)
886                 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
887 
888 out:
889         /* Beware - returning non-zero tells the rdma_cm to destroy
890          * the cm_id. We should certainly not do it as long as we still
891          * "own" the cm_id. */
892         if (ret) {
893                 if (ic->i_cm_id == cm_id)
894                         ret = 0;
895         }
896         ic->i_active_side = true;
897         return ret;
898 }
899 
900 int rds_ib_conn_path_connect(struct rds_conn_path *cp)
901 {
902         struct rds_connection *conn = cp->cp_conn;
903         struct sockaddr_storage src, dest;
904         rdma_cm_event_handler handler;
905         struct rds_ib_connection *ic;
906         int ret;
907 
908         ic = conn->c_transport_data;
909 
910         /* XXX I wonder what affect the port space has */
911         /* delegate cm event handler to rdma_transport */
912 #if IS_ENABLED(CONFIG_IPV6)
913         if (conn->c_isv6)
914                 handler = rds6_rdma_cm_event_handler;
915         else
916 #endif
917                 handler = rds_rdma_cm_event_handler;
918         ic->i_cm_id = rdma_create_id(&init_net, handler, conn,
919                                      RDMA_PS_TCP, IB_QPT_RC);
920         if (IS_ERR(ic->i_cm_id)) {
921                 ret = PTR_ERR(ic->i_cm_id);
922                 ic->i_cm_id = NULL;
923                 rdsdebug("rdma_create_id() failed: %d\n", ret);
924                 goto out;
925         }
926 
927         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
928 
929         if (ipv6_addr_v4mapped(&conn->c_faddr)) {
930                 struct sockaddr_in *sin;
931 
932                 sin = (struct sockaddr_in *)&src;
933                 sin->sin_family = AF_INET;
934                 sin->sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
935                 sin->sin_port = 0;
936 
937                 sin = (struct sockaddr_in *)&dest;
938                 sin->sin_family = AF_INET;
939                 sin->sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
940                 sin->sin_port = htons(RDS_PORT);
941         } else {
942                 struct sockaddr_in6 *sin6;
943 
944                 sin6 = (struct sockaddr_in6 *)&src;
945                 sin6->sin6_family = AF_INET6;
946                 sin6->sin6_addr = conn->c_laddr;
947                 sin6->sin6_port = 0;
948                 sin6->sin6_scope_id = conn->c_dev_if;
949 
950                 sin6 = (struct sockaddr_in6 *)&dest;
951                 sin6->sin6_family = AF_INET6;
952                 sin6->sin6_addr = conn->c_faddr;
953                 sin6->sin6_port = htons(RDS_CM_PORT);
954                 sin6->sin6_scope_id = conn->c_dev_if;
955         }
956 
957         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
958                                 (struct sockaddr *)&dest,
959                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
960         if (ret) {
961                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
962                          ret);
963                 rdma_destroy_id(ic->i_cm_id);
964                 ic->i_cm_id = NULL;
965         }
966 
967 out:
968         return ret;
969 }
970 
971 /*
972  * This is so careful about only cleaning up resources that were built up
973  * so that it can be called at any point during startup.  In fact it
974  * can be called multiple times for a given connection.
975  */
976 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
977 {
978         struct rds_connection *conn = cp->cp_conn;
979         struct rds_ib_connection *ic = conn->c_transport_data;
980         int err = 0;
981 
982         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
983                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
984                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
985 
986         if (ic->i_cm_id) {
987                 struct ib_device *dev = ic->i_cm_id->device;
988 
989                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
990                 err = rdma_disconnect(ic->i_cm_id);
991                 if (err) {
992                         /* Actually this may happen quite frequently, when
993                          * an outgoing connect raced with an incoming connect.
994                          */
995                         rdsdebug("failed to disconnect, cm: %p err %d\n",
996                                 ic->i_cm_id, err);
997                 }
998 
999                 /* kick off "flush_worker" for all pools in order to reap
1000                  * all FRMR registrations that are still marked "FRMR_IS_INUSE"
1001                  */
1002                 rds_ib_flush_mrs();
1003 
1004                 /*
1005                  * We want to wait for tx and rx completion to finish
1006                  * before we tear down the connection, but we have to be
1007                  * careful not to get stuck waiting on a send ring that
1008                  * only has unsignaled sends in it.  We've shutdown new
1009                  * sends before getting here so by waiting for signaled
1010                  * sends to complete we're ensured that there will be no
1011                  * more tx processing.
1012                  */
1013                 wait_event(rds_ib_ring_empty_wait,
1014                            rds_ib_ring_empty(&ic->i_recv_ring) &&
1015                            (atomic_read(&ic->i_signaled_sends) == 0) &&
1016                            (atomic_read(&ic->i_fastreg_inuse_count) == 0) &&
1017                            (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
1018                 tasklet_kill(&ic->i_send_tasklet);
1019                 tasklet_kill(&ic->i_recv_tasklet);
1020 
1021                 atomic_set(&ic->i_cq_quiesce, 1);
1022 
1023                 /* first destroy the ib state that generates callbacks */
1024                 if (ic->i_cm_id->qp)
1025                         rdma_destroy_qp(ic->i_cm_id);
1026                 if (ic->i_send_cq) {
1027                         if (ic->rds_ibdev)
1028                                 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector);
1029                         ib_destroy_cq(ic->i_send_cq);
1030                 }
1031 
1032                 if (ic->i_recv_cq) {
1033                         if (ic->rds_ibdev)
1034                                 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector);
1035                         ib_destroy_cq(ic->i_recv_cq);
1036                 }
1037 
1038                 /* then free the resources that ib callbacks use */
1039                 if (ic->i_send_hdrs)
1040                         ib_dma_free_coherent(dev,
1041                                            ic->i_send_ring.w_nr *
1042                                                 sizeof(struct rds_header),
1043                                            ic->i_send_hdrs,
1044                                            ic->i_send_hdrs_dma);
1045 
1046                 if (ic->i_recv_hdrs)
1047                         ib_dma_free_coherent(dev,
1048                                            ic->i_recv_ring.w_nr *
1049                                                 sizeof(struct rds_header),
1050                                            ic->i_recv_hdrs,
1051                                            ic->i_recv_hdrs_dma);
1052 
1053                 if (ic->i_ack)
1054                         ib_dma_free_coherent(dev, sizeof(struct rds_header),
1055                                              ic->i_ack, ic->i_ack_dma);
1056 
1057                 if (ic->i_sends)
1058                         rds_ib_send_clear_ring(ic);
1059                 if (ic->i_recvs)
1060                         rds_ib_recv_clear_ring(ic);
1061 
1062                 rdma_destroy_id(ic->i_cm_id);
1063 
1064                 /*
1065                  * Move connection back to the nodev list.
1066                  */
1067                 if (ic->rds_ibdev)
1068                         rds_ib_remove_conn(ic->rds_ibdev, conn);
1069 
1070                 ic->i_cm_id = NULL;
1071                 ic->i_pd = NULL;
1072                 ic->i_send_cq = NULL;
1073                 ic->i_recv_cq = NULL;
1074                 ic->i_send_hdrs = NULL;
1075                 ic->i_recv_hdrs = NULL;
1076                 ic->i_ack = NULL;
1077         }
1078         BUG_ON(ic->rds_ibdev);
1079 
1080         /* Clear pending transmit */
1081         if (ic->i_data_op) {
1082                 struct rds_message *rm;
1083 
1084                 rm = container_of(ic->i_data_op, struct rds_message, data);
1085                 rds_message_put(rm);
1086                 ic->i_data_op = NULL;
1087         }
1088 
1089         /* Clear the ACK state */
1090         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
1091 #ifdef KERNEL_HAS_ATOMIC64
1092         atomic64_set(&ic->i_ack_next, 0);
1093 #else
1094         ic->i_ack_next = 0;
1095 #endif
1096         ic->i_ack_recv = 0;
1097 
1098         /* Clear flow control state */
1099         ic->i_flowctl = 0;
1100         atomic_set(&ic->i_credits, 0);
1101 
1102         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1103         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1104 
1105         if (ic->i_ibinc) {
1106                 rds_inc_put(&ic->i_ibinc->ii_inc);
1107                 ic->i_ibinc = NULL;
1108         }
1109 
1110         vfree(ic->i_sends);
1111         ic->i_sends = NULL;
1112         vfree(ic->i_recvs);
1113         ic->i_recvs = NULL;
1114         ic->i_active_side = false;
1115 }
1116 
1117 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
1118 {
1119         struct rds_ib_connection *ic;
1120         unsigned long flags;
1121         int ret;
1122 
1123         /* XXX too lazy? */
1124         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
1125         if (!ic)
1126                 return -ENOMEM;
1127 
1128         ret = rds_ib_recv_alloc_caches(ic, gfp);
1129         if (ret) {
1130                 kfree(ic);
1131                 return ret;
1132         }
1133 
1134         INIT_LIST_HEAD(&ic->ib_node);
1135         tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
1136                      (unsigned long)ic);
1137         tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
1138                      (unsigned long)ic);
1139         mutex_init(&ic->i_recv_mutex);
1140 #ifndef KERNEL_HAS_ATOMIC64
1141         spin_lock_init(&ic->i_ack_lock);
1142 #endif
1143         atomic_set(&ic->i_signaled_sends, 0);
1144         atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
1145 
1146         /*
1147          * rds_ib_conn_shutdown() waits for these to be emptied so they
1148          * must be initialized before it can be called.
1149          */
1150         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
1151         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
1152 
1153         ic->conn = conn;
1154         conn->c_transport_data = ic;
1155 
1156         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
1157         list_add_tail(&ic->ib_node, &ib_nodev_conns);
1158         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
1159 
1160 
1161         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
1162         return 0;
1163 }
1164 
1165 /*
1166  * Free a connection. Connection must be shut down and not set for reconnect.
1167  */
1168 void rds_ib_conn_free(void *arg)
1169 {
1170         struct rds_ib_connection *ic = arg;
1171         spinlock_t      *lock_ptr;
1172 
1173         rdsdebug("ic %p\n", ic);
1174 
1175         /*
1176          * Conn is either on a dev's list or on the nodev list.
1177          * A race with shutdown() or connect() would cause problems
1178          * (since rds_ibdev would change) but that should never happen.
1179          */
1180         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
1181 
1182         spin_lock_irq(lock_ptr);
1183         list_del(&ic->ib_node);
1184         spin_unlock_irq(lock_ptr);
1185 
1186         rds_ib_recv_free_caches(ic);
1187 
1188         kfree(ic);
1189 }
1190 
1191 
1192 /*
1193  * An error occurred on the connection
1194  */
1195 void
1196 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
1197 {
1198         va_list ap;
1199 
1200         rds_conn_drop(conn);
1201 
1202         va_start(ap, fmt);
1203         vprintk(fmt, ap);
1204         va_end(ap);
1205 }
1206 

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