Root/net/rds/ib_cm.c

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

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