Root/net/rds/iw_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 "iw.h"
40
41/*
42 * Set the selected protocol version
43 */
44static void rds_iw_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_iw_set_flow_control(struct rds_connection *conn, u32 credits)
53{
54    struct rds_iw_connection *ic = conn->c_transport_data;
55
56    if (rds_iw_sysctl_flow_control && credits != 0) {
57        /* We're doing flow control */
58        ic->i_flowctl = 1;
59        rds_iw_send_add_credits(conn, credits);
60    } else {
61        ic->i_flowctl = 0;
62    }
63}
64
65/*
66 * Connection established.
67 * We get here for both outgoing and incoming connection.
68 */
69void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
70{
71    const struct rds_iw_connect_private *dp = NULL;
72    struct rds_iw_connection *ic = conn->c_transport_data;
73    struct rds_iw_device *rds_iwdev;
74    int err;
75
76    if (event->param.conn.private_data_len) {
77        dp = event->param.conn.private_data;
78
79        rds_iw_set_protocol(conn,
80                RDS_PROTOCOL(dp->dp_protocol_major,
81                    dp->dp_protocol_minor));
82        rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
83    }
84
85    /* update ib_device with this local ipaddr & conn */
86    rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
87    err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
88    if (err)
89        printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
90    rds_iw_add_conn(rds_iwdev, conn);
91
92    /* If the peer gave us the last packet it saw, process this as if
93     * we had received a regular ACK. */
94    if (dp && dp->dp_ack_seq)
95        rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
96
97    printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
98            &conn->c_laddr, &conn->c_faddr,
99            RDS_PROTOCOL_MAJOR(conn->c_version),
100            RDS_PROTOCOL_MINOR(conn->c_version),
101            ic->i_flowctl ? ", flow control" : "");
102
103    rds_connect_complete(conn);
104}
105
106static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
107            struct rdma_conn_param *conn_param,
108            struct rds_iw_connect_private *dp,
109            u32 protocol_version)
110{
111    struct rds_iw_connection *ic = conn->c_transport_data;
112
113    memset(conn_param, 0, sizeof(struct rdma_conn_param));
114    /* XXX tune these? */
115    conn_param->responder_resources = 1;
116    conn_param->initiator_depth = 1;
117
118    if (dp) {
119        memset(dp, 0, sizeof(*dp));
120        dp->dp_saddr = conn->c_laddr;
121        dp->dp_daddr = conn->c_faddr;
122        dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
123        dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
124        dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
125        dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
126
127        /* Advertise flow control */
128        if (ic->i_flowctl) {
129            unsigned int credits;
130
131            credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
132            dp->dp_credit = cpu_to_be32(credits);
133            atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
134        }
135
136        conn_param->private_data = dp;
137        conn_param->private_data_len = sizeof(*dp);
138    }
139}
140
141static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
142{
143    rdsdebug("event %u data %p\n", event->event, data);
144}
145
146static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
147{
148    struct rds_connection *conn = data;
149    struct rds_iw_connection *ic = conn->c_transport_data;
150
151    rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
152
153    switch (event->event) {
154    case IB_EVENT_COMM_EST:
155        rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
156        break;
157    case IB_EVENT_QP_REQ_ERR:
158    case IB_EVENT_QP_FATAL:
159    default:
160        rds_iw_conn_error(conn, "RDS/IW: Fatal QP Event %u - connection %pI4->%pI4...reconnecting\n",
161            event->event, &conn->c_laddr,
162            &conn->c_faddr);
163        break;
164    }
165}
166
167/*
168 * Create a QP
169 */
170static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
171        struct rds_iw_device *rds_iwdev,
172        struct rds_iw_work_ring *send_ring,
173        void (*send_cq_handler)(struct ib_cq *, void *),
174        struct rds_iw_work_ring *recv_ring,
175        void (*recv_cq_handler)(struct ib_cq *, void *),
176        void *context)
177{
178    struct ib_device *dev = rds_iwdev->dev;
179    unsigned int send_size, recv_size;
180    int ret;
181
182    /* The offset of 1 is to accomodate the additional ACK WR. */
183    send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
184    recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
185    rds_iw_ring_resize(send_ring, send_size - 1);
186    rds_iw_ring_resize(recv_ring, recv_size - 1);
187
188    memset(attr, 0, sizeof(*attr));
189    attr->event_handler = rds_iw_qp_event_handler;
190    attr->qp_context = context;
191    attr->cap.max_send_wr = send_size;
192    attr->cap.max_recv_wr = recv_size;
193    attr->cap.max_send_sge = rds_iwdev->max_sge;
194    attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
195    attr->sq_sig_type = IB_SIGNAL_REQ_WR;
196    attr->qp_type = IB_QPT_RC;
197
198    attr->send_cq = ib_create_cq(dev, send_cq_handler,
199                     rds_iw_cq_event_handler,
200                     context, send_size, 0);
201    if (IS_ERR(attr->send_cq)) {
202        ret = PTR_ERR(attr->send_cq);
203        attr->send_cq = NULL;
204        rdsdebug("ib_create_cq send failed: %d\n", ret);
205        goto out;
206    }
207
208    attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
209                     rds_iw_cq_event_handler,
210                     context, recv_size, 0);
211    if (IS_ERR(attr->recv_cq)) {
212        ret = PTR_ERR(attr->recv_cq);
213        attr->recv_cq = NULL;
214        rdsdebug("ib_create_cq send failed: %d\n", ret);
215        goto out;
216    }
217
218    ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
219    if (ret) {
220        rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
221        goto out;
222    }
223
224    ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
225    if (ret) {
226        rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
227        goto out;
228    }
229
230out:
231    if (ret) {
232        if (attr->send_cq)
233            ib_destroy_cq(attr->send_cq);
234        if (attr->recv_cq)
235            ib_destroy_cq(attr->recv_cq);
236    }
237    return ret;
238}
239
240/*
241 * This needs to be very careful to not leave IS_ERR pointers around for
242 * cleanup to trip over.
243 */
244static int rds_iw_setup_qp(struct rds_connection *conn)
245{
246    struct rds_iw_connection *ic = conn->c_transport_data;
247    struct ib_device *dev = ic->i_cm_id->device;
248    struct ib_qp_init_attr attr;
249    struct rds_iw_device *rds_iwdev;
250    int ret;
251
252    /* rds_iw_add_one creates a rds_iw_device object per IB device,
253     * and allocates a protection domain, memory range and MR pool
254     * for each. If that fails for any reason, it will not register
255     * the rds_iwdev at all.
256     */
257    rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
258    if (rds_iwdev == NULL) {
259        if (printk_ratelimit())
260            printk(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
261                    dev->name);
262        return -EOPNOTSUPP;
263    }
264
265    /* Protection domain and memory range */
266    ic->i_pd = rds_iwdev->pd;
267    ic->i_mr = rds_iwdev->mr;
268
269    ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
270            &ic->i_send_ring, rds_iw_send_cq_comp_handler,
271            &ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
272            conn);
273    if (ret < 0)
274        goto out;
275
276    ic->i_send_cq = attr.send_cq;
277    ic->i_recv_cq = attr.recv_cq;
278
279    /*
280     * XXX this can fail if max_*_wr is too large? Are we supposed
281     * to back off until we get a value that the hardware can support?
282     */
283    ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
284    if (ret) {
285        rdsdebug("rdma_create_qp failed: %d\n", ret);
286        goto out;
287    }
288
289    ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
290                       ic->i_send_ring.w_nr *
291                        sizeof(struct rds_header),
292                       &ic->i_send_hdrs_dma, GFP_KERNEL);
293    if (ic->i_send_hdrs == NULL) {
294        ret = -ENOMEM;
295        rdsdebug("ib_dma_alloc_coherent send failed\n");
296        goto out;
297    }
298
299    ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
300                       ic->i_recv_ring.w_nr *
301                        sizeof(struct rds_header),
302                       &ic->i_recv_hdrs_dma, GFP_KERNEL);
303    if (ic->i_recv_hdrs == NULL) {
304        ret = -ENOMEM;
305        rdsdebug("ib_dma_alloc_coherent recv failed\n");
306        goto out;
307    }
308
309    ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
310                       &ic->i_ack_dma, GFP_KERNEL);
311    if (ic->i_ack == NULL) {
312        ret = -ENOMEM;
313        rdsdebug("ib_dma_alloc_coherent ack failed\n");
314        goto out;
315    }
316
317    ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
318    if (ic->i_sends == NULL) {
319        ret = -ENOMEM;
320        rdsdebug("send allocation failed\n");
321        goto out;
322    }
323    rds_iw_send_init_ring(ic);
324
325    ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
326    if (ic->i_recvs == NULL) {
327        ret = -ENOMEM;
328        rdsdebug("recv allocation failed\n");
329        goto out;
330    }
331
332    rds_iw_recv_init_ring(ic);
333    rds_iw_recv_init_ack(ic);
334
335    /* Post receive buffers - as a side effect, this will update
336     * the posted credit count. */
337    rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
338
339    rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
340         ic->i_send_cq, ic->i_recv_cq);
341
342out:
343    return ret;
344}
345
346static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
347{
348    u16 common;
349    u32 version = 0;
350
351    /* rdma_cm private data is odd - when there is any private data in the
352     * request, we will be given a pretty large buffer without telling us the
353     * original size. The only way to tell the difference is by looking at
354     * the contents, which are initialized to zero.
355     * If the protocol version fields aren't set, this is a connection attempt
356     * from an older version. This could could be 3.0 or 2.0 - we can't tell.
357     * We really should have changed this for OFED 1.3 :-( */
358    if (dp->dp_protocol_major == 0)
359        return RDS_PROTOCOL_3_0;
360
361    common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
362    if (dp->dp_protocol_major == 3 && common) {
363        version = RDS_PROTOCOL_3_0;
364        while ((common >>= 1) != 0)
365            version++;
366    } else if (printk_ratelimit()) {
367        printk(KERN_NOTICE "RDS: Connection from %pI4 using "
368            "incompatible protocol version %u.%u\n",
369            &dp->dp_saddr,
370            dp->dp_protocol_major,
371            dp->dp_protocol_minor);
372    }
373    return version;
374}
375
376int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
377                    struct rdma_cm_event *event)
378{
379    const struct rds_iw_connect_private *dp = event->param.conn.private_data;
380    struct rds_iw_connect_private dp_rep;
381    struct rds_connection *conn = NULL;
382    struct rds_iw_connection *ic = NULL;
383    struct rdma_conn_param conn_param;
384    struct rds_iw_device *rds_iwdev;
385    u32 version;
386    int err, destroy = 1;
387
388    /* Check whether the remote protocol version matches ours. */
389    version = rds_iw_protocol_compatible(dp);
390    if (!version)
391        goto out;
392
393    rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
394         &dp->dp_saddr, &dp->dp_daddr,
395         RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
396
397    conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
398                   GFP_KERNEL);
399    if (IS_ERR(conn)) {
400        rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
401        conn = NULL;
402        goto out;
403    }
404
405    /*
406     * The connection request may occur while the
407     * previous connection exist, e.g. in case of failover.
408     * But as connections may be initiated simultaneously
409     * by both hosts, we have a random backoff mechanism -
410     * see the comment above rds_queue_reconnect()
411     */
412    mutex_lock(&conn->c_cm_lock);
413    if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
414        if (rds_conn_state(conn) == RDS_CONN_UP) {
415            rdsdebug("incoming connect while connecting\n");
416            rds_conn_drop(conn);
417            rds_iw_stats_inc(s_iw_listen_closed_stale);
418        } else
419        if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
420            /* Wait and see - our connect may still be succeeding */
421            rds_iw_stats_inc(s_iw_connect_raced);
422        }
423        mutex_unlock(&conn->c_cm_lock);
424        goto out;
425    }
426
427    ic = conn->c_transport_data;
428
429    rds_iw_set_protocol(conn, version);
430    rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
431
432    /* If the peer gave us the last packet it saw, process this as if
433     * we had received a regular ACK. */
434    if (dp->dp_ack_seq)
435        rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
436
437    BUG_ON(cm_id->context);
438    BUG_ON(ic->i_cm_id);
439
440    ic->i_cm_id = cm_id;
441    cm_id->context = conn;
442
443    rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
444    ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
445
446    /* We got halfway through setting up the ib_connection, if we
447     * fail now, we have to take the long route out of this mess. */
448    destroy = 0;
449
450    err = rds_iw_setup_qp(conn);
451    if (err) {
452        rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
453        goto out;
454    }
455
456    rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
457
458    /* rdma_accept() calls rdma_reject() internally if it fails */
459    err = rdma_accept(cm_id, &conn_param);
460    mutex_unlock(&conn->c_cm_lock);
461    if (err) {
462        rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
463        goto out;
464    }
465
466    return 0;
467
468out:
469    rdma_reject(cm_id, NULL, 0);
470    return destroy;
471}
472
473
474int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
475{
476    struct rds_connection *conn = cm_id->context;
477    struct rds_iw_connection *ic = conn->c_transport_data;
478    struct rdma_conn_param conn_param;
479    struct rds_iw_connect_private dp;
480    int ret;
481
482    /* If the peer doesn't do protocol negotiation, we must
483     * default to RDSv3.0 */
484    rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
485    ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */
486
487    ret = rds_iw_setup_qp(conn);
488    if (ret) {
489        rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
490        goto out;
491    }
492
493    rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
494
495    ret = rdma_connect(cm_id, &conn_param);
496    if (ret)
497        rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
498
499out:
500    /* Beware - returning non-zero tells the rdma_cm to destroy
501     * the cm_id. We should certainly not do it as long as we still
502     * "own" the cm_id. */
503    if (ret) {
504        struct rds_iw_connection *ic = conn->c_transport_data;
505
506        if (ic->i_cm_id == cm_id)
507            ret = 0;
508    }
509    return ret;
510}
511
512int rds_iw_conn_connect(struct rds_connection *conn)
513{
514    struct rds_iw_connection *ic = conn->c_transport_data;
515    struct rds_iw_device *rds_iwdev;
516    struct sockaddr_in src, dest;
517    int ret;
518
519    /* XXX I wonder what affect the port space has */
520    /* delegate cm event handler to rdma_transport */
521    ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
522                     RDMA_PS_TCP);
523    if (IS_ERR(ic->i_cm_id)) {
524        ret = PTR_ERR(ic->i_cm_id);
525        ic->i_cm_id = NULL;
526        rdsdebug("rdma_create_id() failed: %d\n", ret);
527        goto out;
528    }
529
530    rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
531
532    src.sin_family = AF_INET;
533    src.sin_addr.s_addr = (__force u32)conn->c_laddr;
534    src.sin_port = (__force u16)htons(0);
535
536    /* First, bind to the local address and device. */
537    ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
538    if (ret) {
539        rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
540                &conn->c_laddr, ret);
541        rdma_destroy_id(ic->i_cm_id);
542        ic->i_cm_id = NULL;
543        goto out;
544    }
545
546    rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
547    ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
548
549    dest.sin_family = AF_INET;
550    dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
551    dest.sin_port = (__force u16)htons(RDS_PORT);
552
553    ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
554                (struct sockaddr *)&dest,
555                RDS_RDMA_RESOLVE_TIMEOUT_MS);
556    if (ret) {
557        rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
558             ret);
559        rdma_destroy_id(ic->i_cm_id);
560        ic->i_cm_id = NULL;
561    }
562
563out:
564    return ret;
565}
566
567/*
568 * This is so careful about only cleaning up resources that were built up
569 * so that it can be called at any point during startup. In fact it
570 * can be called multiple times for a given connection.
571 */
572void rds_iw_conn_shutdown(struct rds_connection *conn)
573{
574    struct rds_iw_connection *ic = conn->c_transport_data;
575    int err = 0;
576    struct ib_qp_attr qp_attr;
577
578    rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
579         ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
580         ic->i_cm_id ? ic->i_cm_id->qp : NULL);
581
582    if (ic->i_cm_id) {
583        struct ib_device *dev = ic->i_cm_id->device;
584
585        rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
586        err = rdma_disconnect(ic->i_cm_id);
587        if (err) {
588            /* Actually this may happen quite frequently, when
589             * an outgoing connect raced with an incoming connect.
590             */
591            rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
592                   " cm: %p err %d\n", ic->i_cm_id, err);
593        }
594
595        if (ic->i_cm_id->qp) {
596            qp_attr.qp_state = IB_QPS_ERR;
597            ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
598        }
599
600        wait_event(rds_iw_ring_empty_wait,
601            rds_iw_ring_empty(&ic->i_send_ring) &&
602            rds_iw_ring_empty(&ic->i_recv_ring));
603
604        if (ic->i_send_hdrs)
605            ib_dma_free_coherent(dev,
606                       ic->i_send_ring.w_nr *
607                        sizeof(struct rds_header),
608                       ic->i_send_hdrs,
609                       ic->i_send_hdrs_dma);
610
611        if (ic->i_recv_hdrs)
612            ib_dma_free_coherent(dev,
613                       ic->i_recv_ring.w_nr *
614                        sizeof(struct rds_header),
615                       ic->i_recv_hdrs,
616                       ic->i_recv_hdrs_dma);
617
618        if (ic->i_ack)
619            ib_dma_free_coherent(dev, sizeof(struct rds_header),
620                         ic->i_ack, ic->i_ack_dma);
621
622        if (ic->i_sends)
623            rds_iw_send_clear_ring(ic);
624        if (ic->i_recvs)
625            rds_iw_recv_clear_ring(ic);
626
627        if (ic->i_cm_id->qp)
628            rdma_destroy_qp(ic->i_cm_id);
629        if (ic->i_send_cq)
630            ib_destroy_cq(ic->i_send_cq);
631        if (ic->i_recv_cq)
632            ib_destroy_cq(ic->i_recv_cq);
633
634        /*
635         * If associated with an rds_iw_device:
636         * Move connection back to the nodev list.
637         * Remove cm_id from the device cm_id list.
638         */
639        if (ic->rds_iwdev)
640            rds_iw_remove_conn(ic->rds_iwdev, conn);
641
642        rdma_destroy_id(ic->i_cm_id);
643
644        ic->i_cm_id = NULL;
645        ic->i_pd = NULL;
646        ic->i_mr = NULL;
647        ic->i_send_cq = NULL;
648        ic->i_recv_cq = NULL;
649        ic->i_send_hdrs = NULL;
650        ic->i_recv_hdrs = NULL;
651        ic->i_ack = NULL;
652    }
653    BUG_ON(ic->rds_iwdev);
654
655    /* Clear pending transmit */
656    if (ic->i_rm) {
657        rds_message_put(ic->i_rm);
658        ic->i_rm = NULL;
659    }
660
661    /* Clear the ACK state */
662    clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
663#ifdef KERNEL_HAS_ATOMIC64
664    atomic64_set(&ic->i_ack_next, 0);
665#else
666    ic->i_ack_next = 0;
667#endif
668    ic->i_ack_recv = 0;
669
670    /* Clear flow control state */
671    ic->i_flowctl = 0;
672    atomic_set(&ic->i_credits, 0);
673
674    rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
675    rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
676
677    if (ic->i_iwinc) {
678        rds_inc_put(&ic->i_iwinc->ii_inc);
679        ic->i_iwinc = NULL;
680    }
681
682    vfree(ic->i_sends);
683    ic->i_sends = NULL;
684    vfree(ic->i_recvs);
685    ic->i_recvs = NULL;
686    rdsdebug("shutdown complete\n");
687}
688
689int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
690{
691    struct rds_iw_connection *ic;
692    unsigned long flags;
693
694    /* XXX too lazy? */
695    ic = kzalloc(sizeof(struct rds_iw_connection), GFP_KERNEL);
696    if (ic == NULL)
697        return -ENOMEM;
698
699    INIT_LIST_HEAD(&ic->iw_node);
700    tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
701             (unsigned long) ic);
702    mutex_init(&ic->i_recv_mutex);
703#ifndef KERNEL_HAS_ATOMIC64
704    spin_lock_init(&ic->i_ack_lock);
705#endif
706
707    /*
708     * rds_iw_conn_shutdown() waits for these to be emptied so they
709     * must be initialized before it can be called.
710     */
711    rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
712    rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
713
714    ic->conn = conn;
715    conn->c_transport_data = ic;
716
717    spin_lock_irqsave(&iw_nodev_conns_lock, flags);
718    list_add_tail(&ic->iw_node, &iw_nodev_conns);
719    spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
720
721
722    rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
723    return 0;
724}
725
726/*
727 * Free a connection. Connection must be shut down and not set for reconnect.
728 */
729void rds_iw_conn_free(void *arg)
730{
731    struct rds_iw_connection *ic = arg;
732    spinlock_t *lock_ptr;
733
734    rdsdebug("ic %p\n", ic);
735
736    /*
737     * Conn is either on a dev's list or on the nodev list.
738     * A race with shutdown() or connect() would cause problems
739     * (since rds_iwdev would change) but that should never happen.
740     */
741    lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
742
743    spin_lock_irq(lock_ptr);
744    list_del(&ic->iw_node);
745    spin_unlock_irq(lock_ptr);
746
747    kfree(ic);
748}
749
750/*
751 * An error occurred on the connection
752 */
753void
754__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
755{
756    va_list ap;
757
758    rds_conn_drop(conn);
759
760    va_start(ap, fmt);
761    vprintk(fmt, ap);
762    va_end(ap);
763}
764

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