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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_single_path.h"
 40 #include "rds.h"
 41 #include "ib.h"
 42 
 43 /*
 44  * Set the selected protocol version
 45  */
 46 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
 47 {
 48         conn->c_version = version;
 49 }
 50 
 51 /*
 52  * Set up flow control
 53  */
 54 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
 55 {
 56         struct rds_ib_connection *ic = conn->c_transport_data;
 57 
 58         if (rds_ib_sysctl_flow_control && credits != 0) {
 59                 /* We're doing flow control */
 60                 ic->i_flowctl = 1;
 61                 rds_ib_send_add_credits(conn, credits);
 62         } else {
 63                 ic->i_flowctl = 0;
 64         }
 65 }
 66 
 67 /*
 68  * Tune RNR behavior. Without flow control, we use a rather
 69  * low timeout, but not the absolute minimum - this should
 70  * be tunable.
 71  *
 72  * We already set the RNR retry count to 7 (which is the
 73  * smallest infinite number :-) above.
 74  * If flow control is off, we want to change this back to 0
 75  * so that we learn quickly when our credit accounting is
 76  * buggy.
 77  *
 78  * Caller passes in a qp_attr pointer - don't waste stack spacv
 79  * by allocation this twice.
 80  */
 81 static void
 82 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
 83 {
 84         int ret;
 85 
 86         attr->min_rnr_timer = IB_RNR_TIMER_000_32;
 87         ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
 88         if (ret)
 89                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
 90 }
 91 
 92 /*
 93  * Connection established.
 94  * We get here for both outgoing and incoming connection.
 95  */
 96 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
 97 {
 98         const struct rds_ib_connect_private *dp = NULL;
 99         struct rds_ib_connection *ic = conn->c_transport_data;
100         struct ib_qp_attr qp_attr;
101         int err;
102 
103         if (event->param.conn.private_data_len >= sizeof(*dp)) {
104                 dp = event->param.conn.private_data;
105 
106                 /* make sure it isn't empty data */
107                 if (dp->dp_protocol_major) {
108                         rds_ib_set_protocol(conn,
109                                 RDS_PROTOCOL(dp->dp_protocol_major,
110                                 dp->dp_protocol_minor));
111                         rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
112                 }
113         }
114 
115         if (conn->c_version < RDS_PROTOCOL(3, 1)) {
116                 pr_notice("RDS/IB: Connection <%pI4,%pI4> version %u.%u no longer supported\n",
117                           &conn->c_laddr, &conn->c_faddr,
118                           RDS_PROTOCOL_MAJOR(conn->c_version),
119                           RDS_PROTOCOL_MINOR(conn->c_version));
120                 rds_conn_destroy(conn);
121                 return;
122         } else {
123                 pr_notice("RDS/IB: %s conn connected <%pI4,%pI4> version %u.%u%s\n",
124                           ic->i_active_side ? "Active" : "Passive",
125                           &conn->c_laddr, &conn->c_faddr,
126                           RDS_PROTOCOL_MAJOR(conn->c_version),
127                           RDS_PROTOCOL_MINOR(conn->c_version),
128                           ic->i_flowctl ? ", flow control" : "");
129         }
130 
131         atomic_set(&ic->i_cq_quiesce, 0);
132 
133         /* Init rings and fill recv. this needs to wait until protocol
134          * negotiation is complete, since ring layout is different
135          * from 3.1 to 4.1.
136          */
137         rds_ib_send_init_ring(ic);
138         rds_ib_recv_init_ring(ic);
139         /* Post receive buffers - as a side effect, this will update
140          * the posted credit count. */
141         rds_ib_recv_refill(conn, 1, GFP_KERNEL);
142 
143         /* Tune RNR behavior */
144         rds_ib_tune_rnr(ic, &qp_attr);
145 
146         qp_attr.qp_state = IB_QPS_RTS;
147         err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
148         if (err)
149                 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
150 
151         /* update ib_device with this local ipaddr */
152         err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
153         if (err)
154                 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
155                         err);
156 
157         /* If the peer gave us the last packet it saw, process this as if
158          * we had received a regular ACK. */
159         if (dp) {
160                 /* dp structure start is not guaranteed to be 8 bytes aligned.
161                  * Since dp_ack_seq is 64-bit extended load operations can be
162                  * used so go through get_unaligned to avoid unaligned errors.
163                  */
164                 __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq);
165 
166                 if (dp_ack_seq)
167                         rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq),
168                                             NULL);
169         }
170 
171         rds_connect_complete(conn);
172 }
173 
174 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
175                         struct rdma_conn_param *conn_param,
176                         struct rds_ib_connect_private *dp,
177                         u32 protocol_version,
178                         u32 max_responder_resources,
179                         u32 max_initiator_depth)
180 {
181         struct rds_ib_connection *ic = conn->c_transport_data;
182         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
183 
184         memset(conn_param, 0, sizeof(struct rdma_conn_param));
185 
186         conn_param->responder_resources =
187                 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
188         conn_param->initiator_depth =
189                 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
190         conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
191         conn_param->rnr_retry_count = 7;
192 
193         if (dp) {
194                 memset(dp, 0, sizeof(*dp));
195                 dp->dp_saddr = conn->c_laddr;
196                 dp->dp_daddr = conn->c_faddr;
197                 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
198                 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
199                 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
200                 dp->dp_ack_seq = cpu_to_be64(rds_ib_piggyb_ack(ic));
201 
202                 /* Advertise flow control */
203                 if (ic->i_flowctl) {
204                         unsigned int credits;
205 
206                         credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
207                         dp->dp_credit = cpu_to_be32(credits);
208                         atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
209                 }
210 
211                 conn_param->private_data = dp;
212                 conn_param->private_data_len = sizeof(*dp);
213         }
214 }
215 
216 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
217 {
218         rdsdebug("event %u (%s) data %p\n",
219                  event->event, ib_event_msg(event->event), data);
220 }
221 
222 /* Plucking the oldest entry from the ring can be done concurrently with
223  * the thread refilling the ring.  Each ring operation is protected by
224  * spinlocks and the transient state of refilling doesn't change the
225  * recording of which entry is oldest.
226  *
227  * This relies on IB only calling one cq comp_handler for each cq so that
228  * there will only be one caller of rds_recv_incoming() per RDS connection.
229  */
230 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
231 {
232         struct rds_connection *conn = context;
233         struct rds_ib_connection *ic = conn->c_transport_data;
234 
235         rdsdebug("conn %p cq %p\n", conn, cq);
236 
237         rds_ib_stats_inc(s_ib_evt_handler_call);
238 
239         tasklet_schedule(&ic->i_recv_tasklet);
240 }
241 
242 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
243                      struct ib_wc *wcs)
244 {
245         int nr, i;
246         struct ib_wc *wc;
247 
248         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
249                 for (i = 0; i < nr; i++) {
250                         wc = wcs + i;
251                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
252                                  (unsigned long long)wc->wr_id, wc->status,
253                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
254 
255                         if (wc->wr_id <= ic->i_send_ring.w_nr ||
256                             wc->wr_id == RDS_IB_ACK_WR_ID)
257                                 rds_ib_send_cqe_handler(ic, wc);
258                         else
259                                 rds_ib_mr_cqe_handler(ic, wc);
260 
261                 }
262         }
263 }
264 
265 static void rds_ib_tasklet_fn_send(unsigned long data)
266 {
267         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
268         struct rds_connection *conn = ic->conn;
269 
270         rds_ib_stats_inc(s_ib_tasklet_call);
271 
272         /* if cq has been already reaped, ignore incoming cq event */
273         if (atomic_read(&ic->i_cq_quiesce))
274                 return;
275 
276         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
277         ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
278         poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
279 
280         if (rds_conn_up(conn) &&
281             (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
282             test_bit(0, &conn->c_map_queued)))
283                 rds_send_xmit(&ic->conn->c_path[0]);
284 }
285 
286 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
287                      struct ib_wc *wcs,
288                      struct rds_ib_ack_state *ack_state)
289 {
290         int nr, i;
291         struct ib_wc *wc;
292 
293         while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
294                 for (i = 0; i < nr; i++) {
295                         wc = wcs + i;
296                         rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
297                                  (unsigned long long)wc->wr_id, wc->status,
298                                  wc->byte_len, be32_to_cpu(wc->ex.imm_data));
299 
300                         rds_ib_recv_cqe_handler(ic, wc, ack_state);
301                 }
302         }
303 }
304 
305 static void rds_ib_tasklet_fn_recv(unsigned long data)
306 {
307         struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
308         struct rds_connection *conn = ic->conn;
309         struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
310         struct rds_ib_ack_state state;
311 
312         if (!rds_ibdev)
313                 rds_conn_drop(conn);
314 
315         rds_ib_stats_inc(s_ib_tasklet_call);
316 
317         /* if cq has been already reaped, ignore incoming cq event */
318         if (atomic_read(&ic->i_cq_quiesce))
319                 return;
320 
321         memset(&state, 0, sizeof(state));
322         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
323         ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
324         poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
325 
326         if (state.ack_next_valid)
327                 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
328         if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
329                 rds_send_drop_acked(conn, state.ack_recv, NULL);
330                 ic->i_ack_recv = state.ack_recv;
331         }
332 
333         if (rds_conn_up(conn))
334                 rds_ib_attempt_ack(ic);
335 }
336 
337 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
338 {
339         struct rds_connection *conn = data;
340         struct rds_ib_connection *ic = conn->c_transport_data;
341 
342         rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
343                  ib_event_msg(event->event));
344 
345         switch (event->event) {
346         case IB_EVENT_COMM_EST:
347                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
348                 break;
349         default:
350                 rdsdebug("Fatal QP Event %u (%s) "
351                         "- connection %pI4->%pI4, reconnecting\n",
352                         event->event, ib_event_msg(event->event),
353                         &conn->c_laddr, &conn->c_faddr);
354                 rds_conn_drop(conn);
355                 break;
356         }
357 }
358 
359 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
360 {
361         struct rds_connection *conn = context;
362         struct rds_ib_connection *ic = conn->c_transport_data;
363 
364         rdsdebug("conn %p cq %p\n", conn, cq);
365 
366         rds_ib_stats_inc(s_ib_evt_handler_call);
367 
368         tasklet_schedule(&ic->i_send_tasklet);
369 }
370 
371 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev)
372 {
373         int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1];
374         int index = rds_ibdev->dev->num_comp_vectors - 1;
375         int i;
376 
377         for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) {
378                 if (rds_ibdev->vector_load[i] < min) {
379                         index = i;
380                         min = rds_ibdev->vector_load[i];
381                 }
382         }
383 
384         rds_ibdev->vector_load[index]++;
385         return index;
386 }
387 
388 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index)
389 {
390         rds_ibdev->vector_load[index]--;
391 }
392 
393 /*
394  * This needs to be very careful to not leave IS_ERR pointers around for
395  * cleanup to trip over.
396  */
397 static int rds_ib_setup_qp(struct rds_connection *conn)
398 {
399         struct rds_ib_connection *ic = conn->c_transport_data;
400         struct ib_device *dev = ic->i_cm_id->device;
401         struct ib_qp_init_attr attr;
402         struct ib_cq_init_attr cq_attr = {};
403         struct rds_ib_device *rds_ibdev;
404         int ret, fr_queue_space;
405 
406         /*
407          * It's normal to see a null device if an incoming connection races
408          * with device removal, so we don't print a warning.
409          */
410         rds_ibdev = rds_ib_get_client_data(dev);
411         if (!rds_ibdev)
412                 return -EOPNOTSUPP;
413 
414         /* The fr_queue_space is currently set to 512, to add extra space on
415          * completion queue and send queue. This extra space is used for FRMR
416          * registration and invalidation work requests
417          */
418         fr_queue_space = rds_ibdev->use_fastreg ?
419                          (RDS_IB_DEFAULT_FR_WR + 1) +
420                          (RDS_IB_DEFAULT_FR_INV_WR + 1)
421                          : 0;
422 
423         /* add the conn now so that connection establishment has the dev */
424         rds_ib_add_conn(rds_ibdev, conn);
425 
426         if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
427                 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
428         if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
429                 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
430 
431         /* Protection domain and memory range */
432         ic->i_pd = rds_ibdev->pd;
433 
434         ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev);
435         cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
436         cq_attr.comp_vector = ic->i_scq_vector;
437         ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
438                                      rds_ib_cq_event_handler, conn,
439                                      &cq_attr);
440         if (IS_ERR(ic->i_send_cq)) {
441                 ret = PTR_ERR(ic->i_send_cq);
442                 ic->i_send_cq = NULL;
443                 ibdev_put_vector(rds_ibdev, ic->i_scq_vector);
444                 rdsdebug("ib_create_cq send failed: %d\n", ret);
445                 goto rds_ibdev_out;
446         }
447 
448         ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev);
449         cq_attr.cqe = ic->i_recv_ring.w_nr;
450         cq_attr.comp_vector = ic->i_rcq_vector;
451         ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
452                                      rds_ib_cq_event_handler, conn,
453                                      &cq_attr);
454         if (IS_ERR(ic->i_recv_cq)) {
455                 ret = PTR_ERR(ic->i_recv_cq);
456                 ic->i_recv_cq = NULL;
457                 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector);
458                 rdsdebug("ib_create_cq recv failed: %d\n", ret);
459                 goto send_cq_out;
460         }
461 
462         ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
463         if (ret) {
464                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
465                 goto recv_cq_out;
466         }
467 
468         ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
469         if (ret) {
470                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
471                 goto recv_cq_out;
472         }
473 
474         /* XXX negotiate max send/recv with remote? */
475         memset(&attr, 0, sizeof(attr));
476         attr.event_handler = rds_ib_qp_event_handler;
477         attr.qp_context = conn;
478         /* + 1 to allow for the single ack message */
479         attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
480         attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
481         attr.cap.max_send_sge = rds_ibdev->max_sge;
482         attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
483         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
484         attr.qp_type = IB_QPT_RC;
485         attr.send_cq = ic->i_send_cq;
486         attr.recv_cq = ic->i_recv_cq;
487         atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
488         atomic_set(&ic->i_fastunreg_wrs, RDS_IB_DEFAULT_FR_INV_WR);
489 
490         /*
491          * XXX this can fail if max_*_wr is too large?  Are we supposed
492          * to back off until we get a value that the hardware can support?
493          */
494         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
495         if (ret) {
496                 rdsdebug("rdma_create_qp failed: %d\n", ret);
497                 goto recv_cq_out;
498         }
499 
500         ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
501                                            ic->i_send_ring.w_nr *
502                                                 sizeof(struct rds_header),
503                                            &ic->i_send_hdrs_dma, GFP_KERNEL);
504         if (!ic->i_send_hdrs) {
505                 ret = -ENOMEM;
506                 rdsdebug("ib_dma_alloc_coherent send failed\n");
507                 goto qp_out;
508         }
509 
510         ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
511                                            ic->i_recv_ring.w_nr *
512                                                 sizeof(struct rds_header),
513                                            &ic->i_recv_hdrs_dma, GFP_KERNEL);
514         if (!ic->i_recv_hdrs) {
515                 ret = -ENOMEM;
516                 rdsdebug("ib_dma_alloc_coherent recv failed\n");
517                 goto send_hdrs_dma_out;
518         }
519 
520         ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
521                                        &ic->i_ack_dma, GFP_KERNEL);
522         if (!ic->i_ack) {
523                 ret = -ENOMEM;
524                 rdsdebug("ib_dma_alloc_coherent ack failed\n");
525                 goto recv_hdrs_dma_out;
526         }
527 
528         ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
529                                    ibdev_to_node(dev));
530         if (!ic->i_sends) {
531                 ret = -ENOMEM;
532                 rdsdebug("send allocation failed\n");
533                 goto ack_dma_out;
534         }
535 
536         ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
537                                    ibdev_to_node(dev));
538         if (!ic->i_recvs) {
539                 ret = -ENOMEM;
540                 rdsdebug("recv allocation failed\n");
541                 goto sends_out;
542         }
543 
544         rds_ib_recv_init_ack(ic);
545 
546         rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
547                  ic->i_send_cq, ic->i_recv_cq);
548 
549         return ret;
550 
551 sends_out:
552         vfree(ic->i_sends);
553 ack_dma_out:
554         ib_dma_free_coherent(dev, sizeof(struct rds_header),
555                              ic->i_ack, ic->i_ack_dma);
556 recv_hdrs_dma_out:
557         ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr *
558                                         sizeof(struct rds_header),
559                                         ic->i_recv_hdrs, ic->i_recv_hdrs_dma);
560 send_hdrs_dma_out:
561         ib_dma_free_coherent(dev, ic->i_send_ring.w_nr *
562                                         sizeof(struct rds_header),
563                                         ic->i_send_hdrs, ic->i_send_hdrs_dma);
564 qp_out:
565         rdma_destroy_qp(ic->i_cm_id);
566 recv_cq_out:
567         if (!ib_destroy_cq(ic->i_recv_cq))
568                 ic->i_recv_cq = NULL;
569 send_cq_out:
570         if (!ib_destroy_cq(ic->i_send_cq))
571                 ic->i_send_cq = NULL;
572 rds_ibdev_out:
573         rds_ib_remove_conn(rds_ibdev, conn);
574         rds_ib_dev_put(rds_ibdev);
575 
576         return ret;
577 }
578 
579 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
580 {
581         const struct rds_ib_connect_private *dp = event->param.conn.private_data;
582         u16 common;
583         u32 version = 0;
584 
585         /*
586          * rdma_cm private data is odd - when there is any private data in the
587          * request, we will be given a pretty large buffer without telling us the
588          * original size. The only way to tell the difference is by looking at
589          * the contents, which are initialized to zero.
590          * If the protocol version fields aren't set, this is a connection attempt
591          * from an older version. This could could be 3.0 or 2.0 - we can't tell.
592          * We really should have changed this for OFED 1.3 :-(
593          */
594 
595         /* Be paranoid. RDS always has privdata */
596         if (!event->param.conn.private_data_len) {
597                 printk(KERN_NOTICE "RDS incoming connection has no private data, "
598                         "rejecting\n");
599                 return 0;
600         }
601 
602         /* Even if len is crap *now* I still want to check it. -ASG */
603         if (event->param.conn.private_data_len < sizeof (*dp) ||
604             dp->dp_protocol_major == 0)
605                 return RDS_PROTOCOL_3_0;
606 
607         common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
608         if (dp->dp_protocol_major == 3 && common) {
609                 version = RDS_PROTOCOL_3_0;
610                 while ((common >>= 1) != 0)
611                         version++;
612         } else
613                 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
614                                 &dp->dp_saddr,
615                                 dp->dp_protocol_major,
616                                 dp->dp_protocol_minor);
617         return version;
618 }
619 
620 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
621                                     struct rdma_cm_event *event)
622 {
623         __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
624         __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
625         const struct rds_ib_connect_private *dp = event->param.conn.private_data;
626         struct rds_ib_connect_private dp_rep;
627         struct rds_connection *conn = NULL;
628         struct rds_ib_connection *ic = NULL;
629         struct rdma_conn_param conn_param;
630         u32 version;
631         int err = 1, destroy = 1;
632 
633         /* Check whether the remote protocol version matches ours. */
634         version = rds_ib_protocol_compatible(event);
635         if (!version)
636                 goto out;
637 
638         rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
639                  "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
640                  RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
641                  (unsigned long long)be64_to_cpu(lguid),
642                  (unsigned long long)be64_to_cpu(fguid));
643 
644         /* RDS/IB is not currently netns aware, thus init_net */
645         conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr,
646                                &rds_ib_transport, GFP_KERNEL);
647         if (IS_ERR(conn)) {
648                 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
649                 conn = NULL;
650                 goto out;
651         }
652 
653         /*
654          * The connection request may occur while the
655          * previous connection exist, e.g. in case of failover.
656          * But as connections may be initiated simultaneously
657          * by both hosts, we have a random backoff mechanism -
658          * see the comment above rds_queue_reconnect()
659          */
660         mutex_lock(&conn->c_cm_lock);
661         if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
662                 if (rds_conn_state(conn) == RDS_CONN_UP) {
663                         rdsdebug("incoming connect while connecting\n");
664                         rds_conn_drop(conn);
665                         rds_ib_stats_inc(s_ib_listen_closed_stale);
666                 } else
667                 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
668                         /* Wait and see - our connect may still be succeeding */
669                         rds_ib_stats_inc(s_ib_connect_raced);
670                 }
671                 goto out;
672         }
673 
674         ic = conn->c_transport_data;
675 
676         rds_ib_set_protocol(conn, version);
677         rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
678 
679         /* If the peer gave us the last packet it saw, process this as if
680          * we had received a regular ACK. */
681         if (dp->dp_ack_seq)
682                 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
683 
684         BUG_ON(cm_id->context);
685         BUG_ON(ic->i_cm_id);
686 
687         ic->i_cm_id = cm_id;
688         cm_id->context = conn;
689 
690         /* We got halfway through setting up the ib_connection, if we
691          * fail now, we have to take the long route out of this mess. */
692         destroy = 0;
693 
694         err = rds_ib_setup_qp(conn);
695         if (err) {
696                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
697                 goto out;
698         }
699 
700         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
701                 event->param.conn.responder_resources,
702                 event->param.conn.initiator_depth);
703 
704         /* rdma_accept() calls rdma_reject() internally if it fails */
705         if (rdma_accept(cm_id, &conn_param))
706                 rds_ib_conn_error(conn, "rdma_accept failed\n");
707 
708 out:
709         if (conn)
710                 mutex_unlock(&conn->c_cm_lock);
711         if (err)
712                 rdma_reject(cm_id, NULL, 0);
713         return destroy;
714 }
715 
716 
717 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
718 {
719         struct rds_connection *conn = cm_id->context;
720         struct rds_ib_connection *ic = conn->c_transport_data;
721         struct rdma_conn_param conn_param;
722         struct rds_ib_connect_private dp;
723         int ret;
724 
725         /* If the peer doesn't do protocol negotiation, we must
726          * default to RDSv3.0 */
727         rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
728         ic->i_flowctl = rds_ib_sysctl_flow_control;     /* advertise flow control */
729 
730         ret = rds_ib_setup_qp(conn);
731         if (ret) {
732                 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
733                 goto out;
734         }
735 
736         rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
737                 UINT_MAX, UINT_MAX);
738         ret = rdma_connect(cm_id, &conn_param);
739         if (ret)
740                 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
741 
742 out:
743         /* Beware - returning non-zero tells the rdma_cm to destroy
744          * the cm_id. We should certainly not do it as long as we still
745          * "own" the cm_id. */
746         if (ret) {
747                 if (ic->i_cm_id == cm_id)
748                         ret = 0;
749         }
750         ic->i_active_side = true;
751         return ret;
752 }
753 
754 int rds_ib_conn_path_connect(struct rds_conn_path *cp)
755 {
756         struct rds_connection *conn = cp->cp_conn;
757         struct rds_ib_connection *ic = conn->c_transport_data;
758         struct sockaddr_in src, dest;
759         int ret;
760 
761         /* XXX I wonder what affect the port space has */
762         /* delegate cm event handler to rdma_transport */
763         ic->i_cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, conn,
764                                      RDMA_PS_TCP, IB_QPT_RC);
765         if (IS_ERR(ic->i_cm_id)) {
766                 ret = PTR_ERR(ic->i_cm_id);
767                 ic->i_cm_id = NULL;
768                 rdsdebug("rdma_create_id() failed: %d\n", ret);
769                 goto out;
770         }
771 
772         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
773 
774         src.sin_family = AF_INET;
775         src.sin_addr.s_addr = (__force u32)conn->c_laddr;
776         src.sin_port = (__force u16)htons(0);
777 
778         dest.sin_family = AF_INET;
779         dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
780         dest.sin_port = (__force u16)htons(RDS_PORT);
781 
782         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
783                                 (struct sockaddr *)&dest,
784                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
785         if (ret) {
786                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
787                          ret);
788                 rdma_destroy_id(ic->i_cm_id);
789                 ic->i_cm_id = NULL;
790         }
791 
792 out:
793         return ret;
794 }
795 
796 /*
797  * This is so careful about only cleaning up resources that were built up
798  * so that it can be called at any point during startup.  In fact it
799  * can be called multiple times for a given connection.
800  */
801 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
802 {
803         struct rds_connection *conn = cp->cp_conn;
804         struct rds_ib_connection *ic = conn->c_transport_data;
805         int err = 0;
806 
807         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
808                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
809                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
810 
811         if (ic->i_cm_id) {
812                 struct ib_device *dev = ic->i_cm_id->device;
813 
814                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
815                 err = rdma_disconnect(ic->i_cm_id);
816                 if (err) {
817                         /* Actually this may happen quite frequently, when
818                          * an outgoing connect raced with an incoming connect.
819                          */
820                         rdsdebug("failed to disconnect, cm: %p err %d\n",
821                                 ic->i_cm_id, err);
822                 }
823 
824                 /*
825                  * We want to wait for tx and rx completion to finish
826                  * before we tear down the connection, but we have to be
827                  * careful not to get stuck waiting on a send ring that
828                  * only has unsignaled sends in it.  We've shutdown new
829                  * sends before getting here so by waiting for signaled
830                  * sends to complete we're ensured that there will be no
831                  * more tx processing.
832                  */
833                 wait_event(rds_ib_ring_empty_wait,
834                            rds_ib_ring_empty(&ic->i_recv_ring) &&
835                            (atomic_read(&ic->i_signaled_sends) == 0) &&
836                            (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR) &&
837                            (atomic_read(&ic->i_fastunreg_wrs) == RDS_IB_DEFAULT_FR_INV_WR));
838                 tasklet_kill(&ic->i_send_tasklet);
839                 tasklet_kill(&ic->i_recv_tasklet);
840 
841                 atomic_set(&ic->i_cq_quiesce, 1);
842 
843                 /* first destroy the ib state that generates callbacks */
844                 if (ic->i_cm_id->qp)
845                         rdma_destroy_qp(ic->i_cm_id);
846                 if (ic->i_send_cq) {
847                         if (ic->rds_ibdev)
848                                 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector);
849                         ib_destroy_cq(ic->i_send_cq);
850                 }
851 
852                 if (ic->i_recv_cq) {
853                         if (ic->rds_ibdev)
854                                 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector);
855                         ib_destroy_cq(ic->i_recv_cq);
856                 }
857 
858                 /* then free the resources that ib callbacks use */
859                 if (ic->i_send_hdrs)
860                         ib_dma_free_coherent(dev,
861                                            ic->i_send_ring.w_nr *
862                                                 sizeof(struct rds_header),
863                                            ic->i_send_hdrs,
864                                            ic->i_send_hdrs_dma);
865 
866                 if (ic->i_recv_hdrs)
867                         ib_dma_free_coherent(dev,
868                                            ic->i_recv_ring.w_nr *
869                                                 sizeof(struct rds_header),
870                                            ic->i_recv_hdrs,
871                                            ic->i_recv_hdrs_dma);
872 
873                 if (ic->i_ack)
874                         ib_dma_free_coherent(dev, sizeof(struct rds_header),
875                                              ic->i_ack, ic->i_ack_dma);
876 
877                 if (ic->i_sends)
878                         rds_ib_send_clear_ring(ic);
879                 if (ic->i_recvs)
880                         rds_ib_recv_clear_ring(ic);
881 
882                 rdma_destroy_id(ic->i_cm_id);
883 
884                 /*
885                  * Move connection back to the nodev list.
886                  */
887                 if (ic->rds_ibdev)
888                         rds_ib_remove_conn(ic->rds_ibdev, conn);
889 
890                 ic->i_cm_id = NULL;
891                 ic->i_pd = NULL;
892                 ic->i_send_cq = NULL;
893                 ic->i_recv_cq = NULL;
894                 ic->i_send_hdrs = NULL;
895                 ic->i_recv_hdrs = NULL;
896                 ic->i_ack = NULL;
897         }
898         BUG_ON(ic->rds_ibdev);
899 
900         /* Clear pending transmit */
901         if (ic->i_data_op) {
902                 struct rds_message *rm;
903 
904                 rm = container_of(ic->i_data_op, struct rds_message, data);
905                 rds_message_put(rm);
906                 ic->i_data_op = NULL;
907         }
908 
909         /* Clear the ACK state */
910         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
911 #ifdef KERNEL_HAS_ATOMIC64
912         atomic64_set(&ic->i_ack_next, 0);
913 #else
914         ic->i_ack_next = 0;
915 #endif
916         ic->i_ack_recv = 0;
917 
918         /* Clear flow control state */
919         ic->i_flowctl = 0;
920         atomic_set(&ic->i_credits, 0);
921 
922         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
923         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
924 
925         if (ic->i_ibinc) {
926                 rds_inc_put(&ic->i_ibinc->ii_inc);
927                 ic->i_ibinc = NULL;
928         }
929 
930         vfree(ic->i_sends);
931         ic->i_sends = NULL;
932         vfree(ic->i_recvs);
933         ic->i_recvs = NULL;
934         ic->i_active_side = false;
935 }
936 
937 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
938 {
939         struct rds_ib_connection *ic;
940         unsigned long flags;
941         int ret;
942 
943         /* XXX too lazy? */
944         ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
945         if (!ic)
946                 return -ENOMEM;
947 
948         ret = rds_ib_recv_alloc_caches(ic);
949         if (ret) {
950                 kfree(ic);
951                 return ret;
952         }
953 
954         INIT_LIST_HEAD(&ic->ib_node);
955         tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
956                      (unsigned long)ic);
957         tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
958                      (unsigned long)ic);
959         mutex_init(&ic->i_recv_mutex);
960 #ifndef KERNEL_HAS_ATOMIC64
961         spin_lock_init(&ic->i_ack_lock);
962 #endif
963         atomic_set(&ic->i_signaled_sends, 0);
964 
965         /*
966          * rds_ib_conn_shutdown() waits for these to be emptied so they
967          * must be initialized before it can be called.
968          */
969         rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
970         rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
971 
972         ic->conn = conn;
973         conn->c_transport_data = ic;
974 
975         spin_lock_irqsave(&ib_nodev_conns_lock, flags);
976         list_add_tail(&ic->ib_node, &ib_nodev_conns);
977         spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
978 
979 
980         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
981         return 0;
982 }
983 
984 /*
985  * Free a connection. Connection must be shut down and not set for reconnect.
986  */
987 void rds_ib_conn_free(void *arg)
988 {
989         struct rds_ib_connection *ic = arg;
990         spinlock_t      *lock_ptr;
991 
992         rdsdebug("ic %p\n", ic);
993 
994         /*
995          * Conn is either on a dev's list or on the nodev list.
996          * A race with shutdown() or connect() would cause problems
997          * (since rds_ibdev would change) but that should never happen.
998          */
999         lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
1000 
1001         spin_lock_irq(lock_ptr);
1002         list_del(&ic->ib_node);
1003         spin_unlock_irq(lock_ptr);
1004 
1005         rds_ib_recv_free_caches(ic);
1006 
1007         kfree(ic);
1008 }
1009 
1010 
1011 /*
1012  * An error occurred on the connection
1013  */
1014 void
1015 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
1016 {
1017         va_list ap;
1018 
1019         rds_conn_drop(conn);
1020 
1021         va_start(ap, fmt);
1022         vprintk(fmt, ap);
1023         va_end(ap);
1024 }
1025 

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