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blkcg: fix blkg_alloc() failure path
[linux-2.6.git] / drivers / infiniband / hw / qib / qib_verbs.c
blob7b6c3bffa9d9fa0cd1090b5498bb663d1cbc5b6f
1 /*
2 * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
3 * All rights reserved.
4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <rdma/ib_mad.h>
36 #include <rdma/ib_user_verbs.h>
37 #include <linux/io.h>
38 #include <linux/module.h>
39 #include <linux/utsname.h>
40 #include <linux/rculist.h>
41 #include <linux/mm.h>
42 #include <linux/random.h>
43
44 #include "qib.h"
45 #include "qib_common.h"
46
47 static unsigned int ib_qib_qp_table_size = 256;
48 module_param_named(qp_table_size, ib_qib_qp_table_size, uint, S_IRUGO);
49 MODULE_PARM_DESC(qp_table_size, "QP table size");
50
51 unsigned int ib_qib_lkey_table_size = 16;
52 module_param_named(lkey_table_size, ib_qib_lkey_table_size, uint,
53 S_IRUGO);
54 MODULE_PARM_DESC(lkey_table_size,
55 "LKEY table size in bits (2^n, 1 <= n <= 23)");
56
57 static unsigned int ib_qib_max_pds = 0xFFFF;
58 module_param_named(max_pds, ib_qib_max_pds, uint, S_IRUGO);
59 MODULE_PARM_DESC(max_pds,
60 "Maximum number of protection domains to support");
61
62 static unsigned int ib_qib_max_ahs = 0xFFFF;
63 module_param_named(max_ahs, ib_qib_max_ahs, uint, S_IRUGO);
64 MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");
65
66 unsigned int ib_qib_max_cqes = 0x2FFFF;
67 module_param_named(max_cqes, ib_qib_max_cqes, uint, S_IRUGO);
68 MODULE_PARM_DESC(max_cqes,
69 "Maximum number of completion queue entries to support");
70
71 unsigned int ib_qib_max_cqs = 0x1FFFF;
72 module_param_named(max_cqs, ib_qib_max_cqs, uint, S_IRUGO);
73 MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");
74
75 unsigned int ib_qib_max_qp_wrs = 0x3FFF;
76 module_param_named(max_qp_wrs, ib_qib_max_qp_wrs, uint, S_IRUGO);
77 MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");
78
79 unsigned int ib_qib_max_qps = 16384;
80 module_param_named(max_qps, ib_qib_max_qps, uint, S_IRUGO);
81 MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");
82
83 unsigned int ib_qib_max_sges = 0x60;
84 module_param_named(max_sges, ib_qib_max_sges, uint, S_IRUGO);
85 MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");
86
87 unsigned int ib_qib_max_mcast_grps = 16384;
88 module_param_named(max_mcast_grps, ib_qib_max_mcast_grps, uint, S_IRUGO);
89 MODULE_PARM_DESC(max_mcast_grps,
90 "Maximum number of multicast groups to support");
91
92 unsigned int ib_qib_max_mcast_qp_attached = 16;
93 module_param_named(max_mcast_qp_attached, ib_qib_max_mcast_qp_attached,
94 uint, S_IRUGO);
95 MODULE_PARM_DESC(max_mcast_qp_attached,
96 "Maximum number of attached QPs to support");
97
98 unsigned int ib_qib_max_srqs = 1024;
99 module_param_named(max_srqs, ib_qib_max_srqs, uint, S_IRUGO);
100 MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");
101
102 unsigned int ib_qib_max_srq_sges = 128;
103 module_param_named(max_srq_sges, ib_qib_max_srq_sges, uint, S_IRUGO);
104 MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");
105
106 unsigned int ib_qib_max_srq_wrs = 0x1FFFF;
107 module_param_named(max_srq_wrs, ib_qib_max_srq_wrs, uint, S_IRUGO);
108 MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");
109
110 static unsigned int ib_qib_disable_sma;
111 module_param_named(disable_sma, ib_qib_disable_sma, uint, S_IWUSR | S_IRUGO);
112 MODULE_PARM_DESC(disable_sma, "Disable the SMA");
113
114 /*
115 * Note that it is OK to post send work requests in the SQE and ERR
116 * states; qib_do_send() will process them and generate error
117 * completions as per IB 1.2 C10-96.
118 */
119 const int ib_qib_state_ops[IB_QPS_ERR + 1] = {
120 [IB_QPS_RESET] = 0,
121 [IB_QPS_INIT] = QIB_POST_RECV_OK,
122 [IB_QPS_RTR] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK,
123 [IB_QPS_RTS] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
124 QIB_POST_SEND_OK | QIB_PROCESS_SEND_OK |
125 QIB_PROCESS_NEXT_SEND_OK,
126 [IB_QPS_SQD] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
127 QIB_POST_SEND_OK | QIB_PROCESS_SEND_OK,
128 [IB_QPS_SQE] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
129 QIB_POST_SEND_OK | QIB_FLUSH_SEND,
130 [IB_QPS_ERR] = QIB_POST_RECV_OK | QIB_FLUSH_RECV |
131 QIB_POST_SEND_OK | QIB_FLUSH_SEND,
132 };
133
134 struct qib_ucontext {
135 struct ib_ucontext ibucontext;
136 };
137
138 static inline struct qib_ucontext *to_iucontext(struct ib_ucontext
139 *ibucontext)
140 {
141 return container_of(ibucontext, struct qib_ucontext, ibucontext);
142 }
143
144 /*
145 * Translate ib_wr_opcode into ib_wc_opcode.
146 */
147 const enum ib_wc_opcode ib_qib_wc_opcode[] = {
148 [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
149 [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
150 [IB_WR_SEND] = IB_WC_SEND,
151 [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
152 [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
153 [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
154 [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD
155 };
156
157 /*
158 * System image GUID.
159 */
160 __be64 ib_qib_sys_image_guid;
161
162 /**
163 * qib_copy_sge - copy data to SGE memory
164 * @ss: the SGE state
165 * @data: the data to copy
166 * @length: the length of the data
167 */
168 void qib_copy_sge(struct qib_sge_state *ss, void *data, u32 length, int release)
169 {
170 struct qib_sge *sge = &ss->sge;
171
172 while (length) {
173 u32 len = sge->length;
174
175 if (len > length)
176 len = length;
177 if (len > sge->sge_length)
178 len = sge->sge_length;
179 BUG_ON(len == 0);
180 memcpy(sge->vaddr, data, len);
181 sge->vaddr += len;
182 sge->length -= len;
183 sge->sge_length -= len;
184 if (sge->sge_length == 0) {
185 if (release)
186 atomic_dec(&sge->mr->refcount);
187 if (--ss->num_sge)
188 *sge = *ss->sg_list++;
189 } else if (sge->length == 0 && sge->mr->lkey) {
190 if (++sge->n >= QIB_SEGSZ) {
191 if (++sge->m >= sge->mr->mapsz)
192 break;
193 sge->n = 0;
194 }
195 sge->vaddr =
196 sge->mr->map[sge->m]->segs[sge->n].vaddr;
197 sge->length =
198 sge->mr->map[sge->m]->segs[sge->n].length;
199 }
200 data += len;
201 length -= len;
202 }
203 }
204
205 /**
206 * qib_skip_sge - skip over SGE memory - XXX almost dup of prev func
207 * @ss: the SGE state
208 * @length: the number of bytes to skip
209 */
210 void qib_skip_sge(struct qib_sge_state *ss, u32 length, int release)
211 {
212 struct qib_sge *sge = &ss->sge;
213
214 while (length) {
215 u32 len = sge->length;
216
217 if (len > length)
218 len = length;
219 if (len > sge->sge_length)
220 len = sge->sge_length;
221 BUG_ON(len == 0);
222 sge->vaddr += len;
223 sge->length -= len;
224 sge->sge_length -= len;
225 if (sge->sge_length == 0) {
226 if (release)
227 atomic_dec(&sge->mr->refcount);
228 if (--ss->num_sge)
229 *sge = *ss->sg_list++;
230 } else if (sge->length == 0 && sge->mr->lkey) {
231 if (++sge->n >= QIB_SEGSZ) {
232 if (++sge->m >= sge->mr->mapsz)
233 break;
234 sge->n = 0;
235 }
236 sge->vaddr =
237 sge->mr->map[sge->m]->segs[sge->n].vaddr;
238 sge->length =
239 sge->mr->map[sge->m]->segs[sge->n].length;
240 }
241 length -= len;
242 }
243 }
244
245 /*
246 * Count the number of DMA descriptors needed to send length bytes of data.
247 * Don't modify the qib_sge_state to get the count.
248 * Return zero if any of the segments is not aligned.
249 */
250 static u32 qib_count_sge(struct qib_sge_state *ss, u32 length)
251 {
252 struct qib_sge *sg_list = ss->sg_list;
253 struct qib_sge sge = ss->sge;
254 u8 num_sge = ss->num_sge;
255 u32 ndesc = 1; /* count the header */
256
257 while (length) {
258 u32 len = sge.length;
259
260 if (len > length)
261 len = length;
262 if (len > sge.sge_length)
263 len = sge.sge_length;
264 BUG_ON(len == 0);
265 if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
266 (len != length && (len & (sizeof(u32) - 1)))) {
267 ndesc = 0;
268 break;
269 }
270 ndesc++;
271 sge.vaddr += len;
272 sge.length -= len;
273 sge.sge_length -= len;
274 if (sge.sge_length == 0) {
275 if (--num_sge)
276 sge = *sg_list++;
277 } else if (sge.length == 0 && sge.mr->lkey) {
278 if (++sge.n >= QIB_SEGSZ) {
279 if (++sge.m >= sge.mr->mapsz)
280 break;
281 sge.n = 0;
282 }
283 sge.vaddr =
284 sge.mr->map[sge.m]->segs[sge.n].vaddr;
285 sge.length =
286 sge.mr->map[sge.m]->segs[sge.n].length;
287 }
288 length -= len;
289 }
290 return ndesc;
291 }
292
293 /*
294 * Copy from the SGEs to the data buffer.
295 */
296 static void qib_copy_from_sge(void *data, struct qib_sge_state *ss, u32 length)
297 {
298 struct qib_sge *sge = &ss->sge;
299
300 while (length) {
301 u32 len = sge->length;
302
303 if (len > length)
304 len = length;
305 if (len > sge->sge_length)
306 len = sge->sge_length;
307 BUG_ON(len == 0);
308 memcpy(data, sge->vaddr, len);
309 sge->vaddr += len;
310 sge->length -= len;
311 sge->sge_length -= len;
312 if (sge->sge_length == 0) {
313 if (--ss->num_sge)
314 *sge = *ss->sg_list++;
315 } else if (sge->length == 0 && sge->mr->lkey) {
316 if (++sge->n >= QIB_SEGSZ) {
317 if (++sge->m >= sge->mr->mapsz)
318 break;
319 sge->n = 0;
320 }
321 sge->vaddr =
322 sge->mr->map[sge->m]->segs[sge->n].vaddr;
323 sge->length =
324 sge->mr->map[sge->m]->segs[sge->n].length;
325 }
326 data += len;
327 length -= len;
328 }
329 }
330
331 /**
332 * qib_post_one_send - post one RC, UC, or UD send work request
333 * @qp: the QP to post on
334 * @wr: the work request to send
335 */
336 static int qib_post_one_send(struct qib_qp *qp, struct ib_send_wr *wr)
337 {
338 struct qib_swqe *wqe;
339 u32 next;
340 int i;
341 int j;
342 int acc;
343 int ret;
344 unsigned long flags;
345 struct qib_lkey_table *rkt;
346 struct qib_pd *pd;
347
348 spin_lock_irqsave(&qp->s_lock, flags);
349
350 /* Check that state is OK to post send. */
351 if (unlikely(!(ib_qib_state_ops[qp->state] & QIB_POST_SEND_OK)))
352 goto bail_inval;
353
354 /* IB spec says that num_sge == 0 is OK. */
355 if (wr->num_sge > qp->s_max_sge)
356 goto bail_inval;
357
358 /*
359 * Don't allow RDMA reads or atomic operations on UC or
360 * undefined operations.
361 * Make sure buffer is large enough to hold the result for atomics.
362 */
363 if (wr->opcode == IB_WR_FAST_REG_MR) {
364 if (qib_fast_reg_mr(qp, wr))
365 goto bail_inval;
366 } else if (qp->ibqp.qp_type == IB_QPT_UC) {
367 if ((unsigned) wr->opcode >= IB_WR_RDMA_READ)
368 goto bail_inval;
369 } else if (qp->ibqp.qp_type != IB_QPT_RC) {
370 /* Check IB_QPT_SMI, IB_QPT_GSI, IB_QPT_UD opcode */
371 if (wr->opcode != IB_WR_SEND &&
372 wr->opcode != IB_WR_SEND_WITH_IMM)
373 goto bail_inval;
374 /* Check UD destination address PD */
375 if (qp->ibqp.pd != wr->wr.ud.ah->pd)
376 goto bail_inval;
377 } else if ((unsigned) wr->opcode > IB_WR_ATOMIC_FETCH_AND_ADD)
378 goto bail_inval;
379 else if (wr->opcode >= IB_WR_ATOMIC_CMP_AND_SWP &&
380 (wr->num_sge == 0 ||
381 wr->sg_list[0].length < sizeof(u64) ||
382 wr->sg_list[0].addr & (sizeof(u64) - 1)))
383 goto bail_inval;
384 else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic)
385 goto bail_inval;
386
387 next = qp->s_head + 1;
388 if (next >= qp->s_size)
389 next = 0;
390 if (next == qp->s_last) {
391 ret = -ENOMEM;
392 goto bail;
393 }
394
395 rkt = &to_idev(qp->ibqp.device)->lk_table;
396 pd = to_ipd(qp->ibqp.pd);
397 wqe = get_swqe_ptr(qp, qp->s_head);
398 wqe->wr = *wr;
399 wqe->length = 0;
400 j = 0;
401 if (wr->num_sge) {
402 acc = wr->opcode >= IB_WR_RDMA_READ ?
403 IB_ACCESS_LOCAL_WRITE : 0;
404 for (i = 0; i < wr->num_sge; i++) {
405 u32 length = wr->sg_list[i].length;
406 int ok;
407
408 if (length == 0)
409 continue;
410 ok = qib_lkey_ok(rkt, pd, &wqe->sg_list[j],
411 &wr->sg_list[i], acc);
412 if (!ok)
413 goto bail_inval_free;
414 wqe->length += length;
415 j++;
416 }
417 wqe->wr.num_sge = j;
418 }
419 if (qp->ibqp.qp_type == IB_QPT_UC ||
420 qp->ibqp.qp_type == IB_QPT_RC) {
421 if (wqe->length > 0x80000000U)
422 goto bail_inval_free;
423 } else if (wqe->length > (dd_from_ibdev(qp->ibqp.device)->pport +
424 qp->port_num - 1)->ibmtu)
425 goto bail_inval_free;
426 else
427 atomic_inc(&to_iah(wr->wr.ud.ah)->refcount);
428 wqe->ssn = qp->s_ssn++;
429 qp->s_head = next;
430
431 ret = 0;
432 goto bail;
433
434 bail_inval_free:
435 while (j) {
436 struct qib_sge *sge = &wqe->sg_list[--j];
437
438 atomic_dec(&sge->mr->refcount);
439 }
440 bail_inval:
441 ret = -EINVAL;
442 bail:
443 spin_unlock_irqrestore(&qp->s_lock, flags);
444 return ret;
445 }
446
447 /**
448 * qib_post_send - post a send on a QP
449 * @ibqp: the QP to post the send on
450 * @wr: the list of work requests to post
451 * @bad_wr: the first bad WR is put here
452 *
453 * This may be called from interrupt context.
454 */
455 static int qib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
456 struct ib_send_wr **bad_wr)
457 {
458 struct qib_qp *qp = to_iqp(ibqp);
459 int err = 0;
460
461 for (; wr; wr = wr->next) {
462 err = qib_post_one_send(qp, wr);
463 if (err) {
464 *bad_wr = wr;
465 goto bail;
466 }
467 }
468
469 /* Try to do the send work in the caller's context. */
470 qib_do_send(&qp->s_work);
471
472 bail:
473 return err;
474 }
475
476 /**
477 * qib_post_receive - post a receive on a QP
478 * @ibqp: the QP to post the receive on
479 * @wr: the WR to post
480 * @bad_wr: the first bad WR is put here
481 *
482 * This may be called from interrupt context.
483 */
484 static int qib_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
485 struct ib_recv_wr **bad_wr)
486 {
487 struct qib_qp *qp = to_iqp(ibqp);
488 struct qib_rwq *wq = qp->r_rq.wq;
489 unsigned long flags;
490 int ret;
491
492 /* Check that state is OK to post receive. */
493 if (!(ib_qib_state_ops[qp->state] & QIB_POST_RECV_OK) || !wq) {
494 *bad_wr = wr;
495 ret = -EINVAL;
496 goto bail;
497 }
498
499 for (; wr; wr = wr->next) {
500 struct qib_rwqe *wqe;
501 u32 next;
502 int i;
503
504 if ((unsigned) wr->num_sge > qp->r_rq.max_sge) {
505 *bad_wr = wr;
506 ret = -EINVAL;
507 goto bail;
508 }
509
510 spin_lock_irqsave(&qp->r_rq.lock, flags);
511 next = wq->head + 1;
512 if (next >= qp->r_rq.size)
513 next = 0;
514 if (next == wq->tail) {
515 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
516 *bad_wr = wr;
517 ret = -ENOMEM;
518 goto bail;
519 }
520
521 wqe = get_rwqe_ptr(&qp->r_rq, wq->head);
522 wqe->wr_id = wr->wr_id;
523 wqe->num_sge = wr->num_sge;
524 for (i = 0; i < wr->num_sge; i++)
525 wqe->sg_list[i] = wr->sg_list[i];
526 /* Make sure queue entry is written before the head index. */
527 smp_wmb();
528 wq->head = next;
529 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
530 }
531 ret = 0;
532
533 bail:
534 return ret;
535 }
536
537 /**
538 * qib_qp_rcv - processing an incoming packet on a QP
539 * @rcd: the context pointer
540 * @hdr: the packet header
541 * @has_grh: true if the packet has a GRH
542 * @data: the packet data
543 * @tlen: the packet length
544 * @qp: the QP the packet came on
545 *
546 * This is called from qib_ib_rcv() to process an incoming packet
547 * for the given QP.
548 * Called at interrupt level.
549 */
550 static void qib_qp_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr,
551 int has_grh, void *data, u32 tlen, struct qib_qp *qp)
552 {
553 struct qib_ibport *ibp = &rcd->ppd->ibport_data;
554
555 spin_lock(&qp->r_lock);
556
557 /* Check for valid receive state. */
558 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) {
559 ibp->n_pkt_drops++;
560 goto unlock;
561 }
562
563 switch (qp->ibqp.qp_type) {
564 case IB_QPT_SMI:
565 case IB_QPT_GSI:
566 if (ib_qib_disable_sma)
567 break;
568 /* FALLTHROUGH */
569 case IB_QPT_UD:
570 qib_ud_rcv(ibp, hdr, has_grh, data, tlen, qp);
571 break;
572
573 case IB_QPT_RC:
574 qib_rc_rcv(rcd, hdr, has_grh, data, tlen, qp);
575 break;
576
577 case IB_QPT_UC:
578 qib_uc_rcv(ibp, hdr, has_grh, data, tlen, qp);
579 break;
580
581 default:
582 break;
583 }
584
585 unlock:
586 spin_unlock(&qp->r_lock);
587 }
588
589 /**
590 * qib_ib_rcv - process an incoming packet
591 * @rcd: the context pointer
592 * @rhdr: the header of the packet
593 * @data: the packet payload
594 * @tlen: the packet length
595 *
596 * This is called from qib_kreceive() to process an incoming packet at
597 * interrupt level. Tlen is the length of the header + data + CRC in bytes.
598 */
599 void qib_ib_rcv(struct qib_ctxtdata *rcd, void *rhdr, void *data, u32 tlen)
600 {
601 struct qib_pportdata *ppd = rcd->ppd;
602 struct qib_ibport *ibp = &ppd->ibport_data;
603 struct qib_ib_header *hdr = rhdr;
604 struct qib_other_headers *ohdr;
605 struct qib_qp *qp;
606 u32 qp_num;
607 int lnh;
608 u8 opcode;
609 u16 lid;
610
611 /* 24 == LRH+BTH+CRC */
612 if (unlikely(tlen < 24))
613 goto drop;
614
615 /* Check for a valid destination LID (see ch. 7.11.1). */
616 lid = be16_to_cpu(hdr->lrh[1]);
617 if (lid < QIB_MULTICAST_LID_BASE) {
618 lid &= ~((1 << ppd->lmc) - 1);
619 if (unlikely(lid != ppd->lid))
620 goto drop;
621 }
622
623 /* Check for GRH */
624 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
625 if (lnh == QIB_LRH_BTH)
626 ohdr = &hdr->u.oth;
627 else if (lnh == QIB_LRH_GRH) {
628 u32 vtf;
629
630 ohdr = &hdr->u.l.oth;
631 if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
632 goto drop;
633 vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
634 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
635 goto drop;
636 } else
637 goto drop;
638
639 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
640 ibp->opstats[opcode & 0x7f].n_bytes += tlen;
641 ibp->opstats[opcode & 0x7f].n_packets++;
642
643 /* Get the destination QP number. */
644 qp_num = be32_to_cpu(ohdr->bth[1]) & QIB_QPN_MASK;
645 if (qp_num == QIB_MULTICAST_QPN) {
646 struct qib_mcast *mcast;
647 struct qib_mcast_qp *p;
648
649 if (lnh != QIB_LRH_GRH)
650 goto drop;
651 mcast = qib_mcast_find(ibp, &hdr->u.l.grh.dgid);
652 if (mcast == NULL)
653 goto drop;
654 ibp->n_multicast_rcv++;
655 list_for_each_entry_rcu(p, &mcast->qp_list, list)
656 qib_qp_rcv(rcd, hdr, 1, data, tlen, p->qp);
657 /*
658 * Notify qib_multicast_detach() if it is waiting for us
659 * to finish.
660 */
661 if (atomic_dec_return(&mcast->refcount) <= 1)
662 wake_up(&mcast->wait);
663 } else {
664 if (rcd->lookaside_qp) {
665 if (rcd->lookaside_qpn != qp_num) {
666 if (atomic_dec_and_test(
667 &rcd->lookaside_qp->refcount))
668 wake_up(
669 &rcd->lookaside_qp->wait);
670 rcd->lookaside_qp = NULL;
671 }
672 }
673 if (!rcd->lookaside_qp) {
674 qp = qib_lookup_qpn(ibp, qp_num);
675 if (!qp)
676 goto drop;
677 rcd->lookaside_qp = qp;
678 rcd->lookaside_qpn = qp_num;
679 } else
680 qp = rcd->lookaside_qp;
681 ibp->n_unicast_rcv++;
682 qib_qp_rcv(rcd, hdr, lnh == QIB_LRH_GRH, data, tlen, qp);
683 }
684 return;
685
686 drop:
687 ibp->n_pkt_drops++;
688 }
689
690 /*
691 * This is called from a timer to check for QPs
692 * which need kernel memory in order to send a packet.
693 */
694 static void mem_timer(unsigned long data)
695 {
696 struct qib_ibdev *dev = (struct qib_ibdev *) data;
697 struct list_head *list = &dev->memwait;
698 struct qib_qp *qp = NULL;
699 unsigned long flags;
700
701 spin_lock_irqsave(&dev->pending_lock, flags);
702 if (!list_empty(list)) {
703 qp = list_entry(list->next, struct qib_qp, iowait);
704 list_del_init(&qp->iowait);
705 atomic_inc(&qp->refcount);
706 if (!list_empty(list))
707 mod_timer(&dev->mem_timer, jiffies + 1);
708 }
709 spin_unlock_irqrestore(&dev->pending_lock, flags);
710
711 if (qp) {
712 spin_lock_irqsave(&qp->s_lock, flags);
713 if (qp->s_flags & QIB_S_WAIT_KMEM) {
714 qp->s_flags &= ~QIB_S_WAIT_KMEM;
715 qib_schedule_send(qp);
716 }
717 spin_unlock_irqrestore(&qp->s_lock, flags);
718 if (atomic_dec_and_test(&qp->refcount))
719 wake_up(&qp->wait);
720 }
721 }
722
723 static void update_sge(struct qib_sge_state *ss, u32 length)
724 {
725 struct qib_sge *sge = &ss->sge;
726
727 sge->vaddr += length;
728 sge->length -= length;
729 sge->sge_length -= length;
730 if (sge->sge_length == 0) {
731 if (--ss->num_sge)
732 *sge = *ss->sg_list++;
733 } else if (sge->length == 0 && sge->mr->lkey) {
734 if (++sge->n >= QIB_SEGSZ) {
735 if (++sge->m >= sge->mr->mapsz)
736 return;
737 sge->n = 0;
738 }
739 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
740 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
741 }
742 }
743
744 #ifdef __LITTLE_ENDIAN
745 static inline u32 get_upper_bits(u32 data, u32 shift)
746 {
747 return data >> shift;
748 }
749
750 static inline u32 set_upper_bits(u32 data, u32 shift)
751 {
752 return data << shift;
753 }
754
755 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
756 {
757 data <<= ((sizeof(u32) - n) * BITS_PER_BYTE);
758 data >>= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
759 return data;
760 }
761 #else
762 static inline u32 get_upper_bits(u32 data, u32 shift)
763 {
764 return data << shift;
765 }
766
767 static inline u32 set_upper_bits(u32 data, u32 shift)
768 {
769 return data >> shift;
770 }
771
772 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
773 {
774 data >>= ((sizeof(u32) - n) * BITS_PER_BYTE);
775 data <<= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
776 return data;
777 }
778 #endif
779
780 static void copy_io(u32 __iomem *piobuf, struct qib_sge_state *ss,
781 u32 length, unsigned flush_wc)
782 {
783 u32 extra = 0;
784 u32 data = 0;
785 u32 last;
786
787 while (1) {
788 u32 len = ss->sge.length;
789 u32 off;
790
791 if (len > length)
792 len = length;
793 if (len > ss->sge.sge_length)
794 len = ss->sge.sge_length;
795 BUG_ON(len == 0);
796 /* If the source address is not aligned, try to align it. */
797 off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
798 if (off) {
799 u32 *addr = (u32 *)((unsigned long)ss->sge.vaddr &
800 ~(sizeof(u32) - 1));
801 u32 v = get_upper_bits(*addr, off * BITS_PER_BYTE);
802 u32 y;
803
804 y = sizeof(u32) - off;
805 if (len > y)
806 len = y;
807 if (len + extra >= sizeof(u32)) {
808 data |= set_upper_bits(v, extra *
809 BITS_PER_BYTE);
810 len = sizeof(u32) - extra;
811 if (len == length) {
812 last = data;
813 break;
814 }
815 __raw_writel(data, piobuf);
816 piobuf++;
817 extra = 0;
818 data = 0;
819 } else {
820 /* Clear unused upper bytes */
821 data |= clear_upper_bytes(v, len, extra);
822 if (len == length) {
823 last = data;
824 break;
825 }
826 extra += len;
827 }
828 } else if (extra) {
829 /* Source address is aligned. */
830 u32 *addr = (u32 *) ss->sge.vaddr;
831 int shift = extra * BITS_PER_BYTE;
832 int ushift = 32 - shift;
833 u32 l = len;
834
835 while (l >= sizeof(u32)) {
836 u32 v = *addr;
837
838 data |= set_upper_bits(v, shift);
839 __raw_writel(data, piobuf);
840 data = get_upper_bits(v, ushift);
841 piobuf++;
842 addr++;
843 l -= sizeof(u32);
844 }
845 /*
846 * We still have 'extra' number of bytes leftover.
847 */
848 if (l) {
849 u32 v = *addr;
850
851 if (l + extra >= sizeof(u32)) {
852 data |= set_upper_bits(v, shift);
853 len -= l + extra - sizeof(u32);
854 if (len == length) {
855 last = data;
856 break;
857 }
858 __raw_writel(data, piobuf);
859 piobuf++;
860 extra = 0;
861 data = 0;
862 } else {
863 /* Clear unused upper bytes */
864 data |= clear_upper_bytes(v, l, extra);
865 if (len == length) {
866 last = data;
867 break;
868 }
869 extra += l;
870 }
871 } else if (len == length) {
872 last = data;
873 break;
874 }
875 } else if (len == length) {
876 u32 w;
877
878 /*
879 * Need to round up for the last dword in the
880 * packet.
881 */
882 w = (len + 3) >> 2;
883 qib_pio_copy(piobuf, ss->sge.vaddr, w - 1);
884 piobuf += w - 1;
885 last = ((u32 *) ss->sge.vaddr)[w - 1];
886 break;
887 } else {
888 u32 w = len >> 2;
889
890 qib_pio_copy(piobuf, ss->sge.vaddr, w);
891 piobuf += w;
892
893 extra = len & (sizeof(u32) - 1);
894 if (extra) {
895 u32 v = ((u32 *) ss->sge.vaddr)[w];
896
897 /* Clear unused upper bytes */
898 data = clear_upper_bytes(v, extra, 0);
899 }
900 }
901 update_sge(ss, len);
902 length -= len;
903 }
904 /* Update address before sending packet. */
905 update_sge(ss, length);
906 if (flush_wc) {
907 /* must flush early everything before trigger word */
908 qib_flush_wc();
909 __raw_writel(last, piobuf);
910 /* be sure trigger word is written */
911 qib_flush_wc();
912 } else
913 __raw_writel(last, piobuf);
914 }
915
916 static noinline struct qib_verbs_txreq *__get_txreq(struct qib_ibdev *dev,
917 struct qib_qp *qp)
918 {
919 struct qib_verbs_txreq *tx;
920 unsigned long flags;
921
922 spin_lock_irqsave(&qp->s_lock, flags);
923 spin_lock(&dev->pending_lock);
924
925 if (!list_empty(&dev->txreq_free)) {
926 struct list_head *l = dev->txreq_free.next;
927
928 list_del(l);
929 spin_unlock(&dev->pending_lock);
930 spin_unlock_irqrestore(&qp->s_lock, flags);
931 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
932 } else {
933 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK &&
934 list_empty(&qp->iowait)) {
935 dev->n_txwait++;
936 qp->s_flags |= QIB_S_WAIT_TX;
937 list_add_tail(&qp->iowait, &dev->txwait);
938 }
939 qp->s_flags &= ~QIB_S_BUSY;
940 spin_unlock(&dev->pending_lock);
941 spin_unlock_irqrestore(&qp->s_lock, flags);
942 tx = ERR_PTR(-EBUSY);
943 }
944 return tx;
945 }
946
947 static inline struct qib_verbs_txreq *get_txreq(struct qib_ibdev *dev,
948 struct qib_qp *qp)
949 {
950 struct qib_verbs_txreq *tx;
951 unsigned long flags;
952
953 spin_lock_irqsave(&dev->pending_lock, flags);
954 /* assume the list non empty */
955 if (likely(!list_empty(&dev->txreq_free))) {
956 struct list_head *l = dev->txreq_free.next;
957
958 list_del(l);
959 spin_unlock_irqrestore(&dev->pending_lock, flags);
960 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
961 } else {
962 /* call slow path to get the extra lock */
963 spin_unlock_irqrestore(&dev->pending_lock, flags);
964 tx = __get_txreq(dev, qp);
965 }
966 return tx;
967 }
968
969 void qib_put_txreq(struct qib_verbs_txreq *tx)
970 {
971 struct qib_ibdev *dev;
972 struct qib_qp *qp;
973 unsigned long flags;
974
975 qp = tx->qp;
976 dev = to_idev(qp->ibqp.device);
977
978 if (atomic_dec_and_test(&qp->refcount))
979 wake_up(&qp->wait);
980 if (tx->mr) {
981 atomic_dec(&tx->mr->refcount);
982 tx->mr = NULL;
983 }
984 if (tx->txreq.flags & QIB_SDMA_TXREQ_F_FREEBUF) {
985 tx->txreq.flags &= ~QIB_SDMA_TXREQ_F_FREEBUF;
986 dma_unmap_single(&dd_from_dev(dev)->pcidev->dev,
987 tx->txreq.addr, tx->hdr_dwords << 2,
988 DMA_TO_DEVICE);
989 kfree(tx->align_buf);
990 }
991
992 spin_lock_irqsave(&dev->pending_lock, flags);
993
994 /* Put struct back on free list */
995 list_add(&tx->txreq.list, &dev->txreq_free);
996
997 if (!list_empty(&dev->txwait)) {
998 /* Wake up first QP wanting a free struct */
999 qp = list_entry(dev->txwait.next, struct qib_qp, iowait);
1000 list_del_init(&qp->iowait);
1001 atomic_inc(&qp->refcount);
1002 spin_unlock_irqrestore(&dev->pending_lock, flags);
1003
1004 spin_lock_irqsave(&qp->s_lock, flags);
1005 if (qp->s_flags & QIB_S_WAIT_TX) {
1006 qp->s_flags &= ~QIB_S_WAIT_TX;
1007 qib_schedule_send(qp);
1008 }
1009 spin_unlock_irqrestore(&qp->s_lock, flags);
1010
1011 if (atomic_dec_and_test(&qp->refcount))
1012 wake_up(&qp->wait);
1013 } else
1014 spin_unlock_irqrestore(&dev->pending_lock, flags);
1015 }
1016
1017 /*
1018 * This is called when there are send DMA descriptors that might be
1019 * available.
1020 *
1021 * This is called with ppd->sdma_lock held.
1022 */
1023 void qib_verbs_sdma_desc_avail(struct qib_pportdata *ppd, unsigned avail)
1024 {
1025 struct qib_qp *qp, *nqp;
1026 struct qib_qp *qps[20];
1027 struct qib_ibdev *dev;
1028 unsigned i, n;
1029
1030 n = 0;
1031 dev = &ppd->dd->verbs_dev;
1032 spin_lock(&dev->pending_lock);
1033
1034 /* Search wait list for first QP wanting DMA descriptors. */
1035 list_for_each_entry_safe(qp, nqp, &dev->dmawait, iowait) {
1036 if (qp->port_num != ppd->port)
1037 continue;
1038 if (n == ARRAY_SIZE(qps))
1039 break;
1040 if (qp->s_tx->txreq.sg_count > avail)
1041 break;
1042 avail -= qp->s_tx->txreq.sg_count;
1043 list_del_init(&qp->iowait);
1044 atomic_inc(&qp->refcount);
1045 qps[n++] = qp;
1046 }
1047
1048 spin_unlock(&dev->pending_lock);
1049
1050 for (i = 0; i < n; i++) {
1051 qp = qps[i];
1052 spin_lock(&qp->s_lock);
1053 if (qp->s_flags & QIB_S_WAIT_DMA_DESC) {
1054 qp->s_flags &= ~QIB_S_WAIT_DMA_DESC;
1055 qib_schedule_send(qp);
1056 }
1057 spin_unlock(&qp->s_lock);
1058 if (atomic_dec_and_test(&qp->refcount))
1059 wake_up(&qp->wait);
1060 }
1061 }
1062
1063 /*
1064 * This is called with ppd->sdma_lock held.
1065 */
1066 static void sdma_complete(struct qib_sdma_txreq *cookie, int status)
1067 {
1068 struct qib_verbs_txreq *tx =
1069 container_of(cookie, struct qib_verbs_txreq, txreq);
1070 struct qib_qp *qp = tx->qp;
1071
1072 spin_lock(&qp->s_lock);
1073 if (tx->wqe)
1074 qib_send_complete(qp, tx->wqe, IB_WC_SUCCESS);
1075 else if (qp->ibqp.qp_type == IB_QPT_RC) {
1076 struct qib_ib_header *hdr;
1077
1078 if (tx->txreq.flags & QIB_SDMA_TXREQ_F_FREEBUF)
1079 hdr = &tx->align_buf->hdr;
1080 else {
1081 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1082
1083 hdr = &dev->pio_hdrs[tx->hdr_inx].hdr;
1084 }
1085 qib_rc_send_complete(qp, hdr);
1086 }
1087 if (atomic_dec_and_test(&qp->s_dma_busy)) {
1088 if (qp->state == IB_QPS_RESET)
1089 wake_up(&qp->wait_dma);
1090 else if (qp->s_flags & QIB_S_WAIT_DMA) {
1091 qp->s_flags &= ~QIB_S_WAIT_DMA;
1092 qib_schedule_send(qp);
1093 }
1094 }
1095 spin_unlock(&qp->s_lock);
1096
1097 qib_put_txreq(tx);
1098 }
1099
1100 static int wait_kmem(struct qib_ibdev *dev, struct qib_qp *qp)
1101 {
1102 unsigned long flags;
1103 int ret = 0;
1104
1105 spin_lock_irqsave(&qp->s_lock, flags);
1106 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) {
1107 spin_lock(&dev->pending_lock);
1108 if (list_empty(&qp->iowait)) {
1109 if (list_empty(&dev->memwait))
1110 mod_timer(&dev->mem_timer, jiffies + 1);
1111 qp->s_flags |= QIB_S_WAIT_KMEM;
1112 list_add_tail(&qp->iowait, &dev->memwait);
1113 }
1114 spin_unlock(&dev->pending_lock);
1115 qp->s_flags &= ~QIB_S_BUSY;
1116 ret = -EBUSY;
1117 }
1118 spin_unlock_irqrestore(&qp->s_lock, flags);
1119
1120 return ret;
1121 }
1122
1123 static int qib_verbs_send_dma(struct qib_qp *qp, struct qib_ib_header *hdr,
1124 u32 hdrwords, struct qib_sge_state *ss, u32 len,
1125 u32 plen, u32 dwords)
1126 {
1127 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1128 struct qib_devdata *dd = dd_from_dev(dev);
1129 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
1130 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1131 struct qib_verbs_txreq *tx;
1132 struct qib_pio_header *phdr;
1133 u32 control;
1134 u32 ndesc;
1135 int ret;
1136
1137 tx = qp->s_tx;
1138 if (tx) {
1139 qp->s_tx = NULL;
1140 /* resend previously constructed packet */
1141 ret = qib_sdma_verbs_send(ppd, tx->ss, tx->dwords, tx);
1142 goto bail;
1143 }
1144
1145 tx = get_txreq(dev, qp);
1146 if (IS_ERR(tx))
1147 goto bail_tx;
1148
1149 control = dd->f_setpbc_control(ppd, plen, qp->s_srate,
1150 be16_to_cpu(hdr->lrh[0]) >> 12);
1151 tx->qp = qp;
1152 atomic_inc(&qp->refcount);
1153 tx->wqe = qp->s_wqe;
1154 tx->mr = qp->s_rdma_mr;
1155 if (qp->s_rdma_mr)
1156 qp->s_rdma_mr = NULL;
1157 tx->txreq.callback = sdma_complete;
1158 if (dd->flags & QIB_HAS_SDMA_TIMEOUT)
1159 tx->txreq.flags = QIB_SDMA_TXREQ_F_HEADTOHOST;
1160 else
1161 tx->txreq.flags = QIB_SDMA_TXREQ_F_INTREQ;
1162 if (plen + 1 > dd->piosize2kmax_dwords)
1163 tx->txreq.flags |= QIB_SDMA_TXREQ_F_USELARGEBUF;
1164
1165 if (len) {
1166 /*
1167 * Don't try to DMA if it takes more descriptors than
1168 * the queue holds.
1169 */
1170 ndesc = qib_count_sge(ss, len);
1171 if (ndesc >= ppd->sdma_descq_cnt)
1172 ndesc = 0;
1173 } else
1174 ndesc = 1;
1175 if (ndesc) {
1176 phdr = &dev->pio_hdrs[tx->hdr_inx];
1177 phdr->pbc[0] = cpu_to_le32(plen);
1178 phdr->pbc[1] = cpu_to_le32(control);
1179 memcpy(&phdr->hdr, hdr, hdrwords << 2);
1180 tx->txreq.flags |= QIB_SDMA_TXREQ_F_FREEDESC;
1181 tx->txreq.sg_count = ndesc;
1182 tx->txreq.addr = dev->pio_hdrs_phys +
1183 tx->hdr_inx * sizeof(struct qib_pio_header);
1184 tx->hdr_dwords = hdrwords + 2; /* add PBC length */
1185 ret = qib_sdma_verbs_send(ppd, ss, dwords, tx);
1186 goto bail;
1187 }
1188
1189 /* Allocate a buffer and copy the header and payload to it. */
1190 tx->hdr_dwords = plen + 1;
1191 phdr = kmalloc(tx->hdr_dwords << 2, GFP_ATOMIC);
1192 if (!phdr)
1193 goto err_tx;
1194 phdr->pbc[0] = cpu_to_le32(plen);
1195 phdr->pbc[1] = cpu_to_le32(control);
1196 memcpy(&phdr->hdr, hdr, hdrwords << 2);
1197 qib_copy_from_sge((u32 *) &phdr->hdr + hdrwords, ss, len);
1198
1199 tx->txreq.addr = dma_map_single(&dd->pcidev->dev, phdr,
1200 tx->hdr_dwords << 2, DMA_TO_DEVICE);
1201 if (dma_mapping_error(&dd->pcidev->dev, tx->txreq.addr))
1202 goto map_err;
1203 tx->align_buf = phdr;
1204 tx->txreq.flags |= QIB_SDMA_TXREQ_F_FREEBUF;
1205 tx->txreq.sg_count = 1;
1206 ret = qib_sdma_verbs_send(ppd, NULL, 0, tx);
1207 goto unaligned;
1208
1209 map_err:
1210 kfree(phdr);
1211 err_tx:
1212 qib_put_txreq(tx);
1213 ret = wait_kmem(dev, qp);
1214 unaligned:
1215 ibp->n_unaligned++;
1216 bail:
1217 return ret;
1218 bail_tx:
1219 ret = PTR_ERR(tx);
1220 goto bail;
1221 }
1222
1223 /*
1224 * If we are now in the error state, return zero to flush the
1225 * send work request.
1226 */
1227 static int no_bufs_available(struct qib_qp *qp)
1228 {
1229 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1230 struct qib_devdata *dd;
1231 unsigned long flags;
1232 int ret = 0;
1233
1234 /*
1235 * Note that as soon as want_buffer() is called and
1236 * possibly before it returns, qib_ib_piobufavail()
1237 * could be called. Therefore, put QP on the I/O wait list before
1238 * enabling the PIO avail interrupt.
1239 */
1240 spin_lock_irqsave(&qp->s_lock, flags);
1241 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) {
1242 spin_lock(&dev->pending_lock);
1243 if (list_empty(&qp->iowait)) {
1244 dev->n_piowait++;
1245 qp->s_flags |= QIB_S_WAIT_PIO;
1246 list_add_tail(&qp->iowait, &dev->piowait);
1247 dd = dd_from_dev(dev);
1248 dd->f_wantpiobuf_intr(dd, 1);
1249 }
1250 spin_unlock(&dev->pending_lock);
1251 qp->s_flags &= ~QIB_S_BUSY;
1252 ret = -EBUSY;
1253 }
1254 spin_unlock_irqrestore(&qp->s_lock, flags);
1255 return ret;
1256 }
1257
1258 static int qib_verbs_send_pio(struct qib_qp *qp, struct qib_ib_header *ibhdr,
1259 u32 hdrwords, struct qib_sge_state *ss, u32 len,
1260 u32 plen, u32 dwords)
1261 {
1262 struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
1263 struct qib_pportdata *ppd = dd->pport + qp->port_num - 1;
1264 u32 *hdr = (u32 *) ibhdr;
1265 u32 __iomem *piobuf_orig;
1266 u32 __iomem *piobuf;
1267 u64 pbc;
1268 unsigned long flags;
1269 unsigned flush_wc;
1270 u32 control;
1271 u32 pbufn;
1272
1273 control = dd->f_setpbc_control(ppd, plen, qp->s_srate,
1274 be16_to_cpu(ibhdr->lrh[0]) >> 12);
1275 pbc = ((u64) control << 32) | plen;
1276 piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn);
1277 if (unlikely(piobuf == NULL))
1278 return no_bufs_available(qp);
1279
1280 /*
1281 * Write the pbc.
1282 * We have to flush after the PBC for correctness on some cpus
1283 * or WC buffer can be written out of order.
1284 */
1285 writeq(pbc, piobuf);
1286 piobuf_orig = piobuf;
1287 piobuf += 2;
1288
1289 flush_wc = dd->flags & QIB_PIO_FLUSH_WC;
1290 if (len == 0) {
1291 /*
1292 * If there is just the header portion, must flush before
1293 * writing last word of header for correctness, and after
1294 * the last header word (trigger word).
1295 */
1296 if (flush_wc) {
1297 qib_flush_wc();
1298 qib_pio_copy(piobuf, hdr, hdrwords - 1);
1299 qib_flush_wc();
1300 __raw_writel(hdr[hdrwords - 1], piobuf + hdrwords - 1);
1301 qib_flush_wc();
1302 } else
1303 qib_pio_copy(piobuf, hdr, hdrwords);
1304 goto done;
1305 }
1306
1307 if (flush_wc)
1308 qib_flush_wc();
1309 qib_pio_copy(piobuf, hdr, hdrwords);
1310 piobuf += hdrwords;
1311
1312 /* The common case is aligned and contained in one segment. */
1313 if (likely(ss->num_sge == 1 && len <= ss->sge.length &&
1314 !((unsigned long)ss->sge.vaddr & (sizeof(u32) - 1)))) {
1315 u32 *addr = (u32 *) ss->sge.vaddr;
1316
1317 /* Update address before sending packet. */
1318 update_sge(ss, len);
1319 if (flush_wc) {
1320 qib_pio_copy(piobuf, addr, dwords - 1);
1321 /* must flush early everything before trigger word */
1322 qib_flush_wc();
1323 __raw_writel(addr[dwords - 1], piobuf + dwords - 1);
1324 /* be sure trigger word is written */
1325 qib_flush_wc();
1326 } else
1327 qib_pio_copy(piobuf, addr, dwords);
1328 goto done;
1329 }
1330 copy_io(piobuf, ss, len, flush_wc);
1331 done:
1332 if (dd->flags & QIB_USE_SPCL_TRIG) {
1333 u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023;
1334 qib_flush_wc();
1335 __raw_writel(0xaebecede, piobuf_orig + spcl_off);
1336 }
1337 qib_sendbuf_done(dd, pbufn);
1338 if (qp->s_rdma_mr) {
1339 atomic_dec(&qp->s_rdma_mr->refcount);
1340 qp->s_rdma_mr = NULL;
1341 }
1342 if (qp->s_wqe) {
1343 spin_lock_irqsave(&qp->s_lock, flags);
1344 qib_send_complete(qp, qp->s_wqe, IB_WC_SUCCESS);
1345 spin_unlock_irqrestore(&qp->s_lock, flags);
1346 } else if (qp->ibqp.qp_type == IB_QPT_RC) {
1347 spin_lock_irqsave(&qp->s_lock, flags);
1348 qib_rc_send_complete(qp, ibhdr);
1349 spin_unlock_irqrestore(&qp->s_lock, flags);
1350 }
1351 return 0;
1352 }
1353
1354 /**
1355 * qib_verbs_send - send a packet
1356 * @qp: the QP to send on
1357 * @hdr: the packet header
1358 * @hdrwords: the number of 32-bit words in the header
1359 * @ss: the SGE to send
1360 * @len: the length of the packet in bytes
1361 *
1362 * Return zero if packet is sent or queued OK.
1363 * Return non-zero and clear qp->s_flags QIB_S_BUSY otherwise.
1364 */
1365 int qib_verbs_send(struct qib_qp *qp, struct qib_ib_header *hdr,
1366 u32 hdrwords, struct qib_sge_state *ss, u32 len)
1367 {
1368 struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
1369 u32 plen;
1370 int ret;
1371 u32 dwords = (len + 3) >> 2;
1372
1373 /*
1374 * Calculate the send buffer trigger address.
1375 * The +1 counts for the pbc control dword following the pbc length.
1376 */
1377 plen = hdrwords + dwords + 1;
1378
1379 /*
1380 * VL15 packets (IB_QPT_SMI) will always use PIO, so we
1381 * can defer SDMA restart until link goes ACTIVE without
1382 * worrying about just how we got there.
1383 */
1384 if (qp->ibqp.qp_type == IB_QPT_SMI ||
1385 !(dd->flags & QIB_HAS_SEND_DMA))
1386 ret = qib_verbs_send_pio(qp, hdr, hdrwords, ss, len,
1387 plen, dwords);
1388 else
1389 ret = qib_verbs_send_dma(qp, hdr, hdrwords, ss, len,
1390 plen, dwords);
1391
1392 return ret;
1393 }
1394
1395 int qib_snapshot_counters(struct qib_pportdata *ppd, u64 *swords,
1396 u64 *rwords, u64 *spkts, u64 *rpkts,
1397 u64 *xmit_wait)
1398 {
1399 int ret;
1400 struct qib_devdata *dd = ppd->dd;
1401
1402 if (!(dd->flags & QIB_PRESENT)) {
1403 /* no hardware, freeze, etc. */
1404 ret = -EINVAL;
1405 goto bail;
1406 }
1407 *swords = dd->f_portcntr(ppd, QIBPORTCNTR_WORDSEND);
1408 *rwords = dd->f_portcntr(ppd, QIBPORTCNTR_WORDRCV);
1409 *spkts = dd->f_portcntr(ppd, QIBPORTCNTR_PKTSEND);
1410 *rpkts = dd->f_portcntr(ppd, QIBPORTCNTR_PKTRCV);
1411 *xmit_wait = dd->f_portcntr(ppd, QIBPORTCNTR_SENDSTALL);
1412
1413 ret = 0;
1414
1415 bail:
1416 return ret;
1417 }
1418
1419 /**
1420 * qib_get_counters - get various chip counters
1421 * @dd: the qlogic_ib device
1422 * @cntrs: counters are placed here
1423 *
1424 * Return the counters needed by recv_pma_get_portcounters().
1425 */
1426 int qib_get_counters(struct qib_pportdata *ppd,
1427 struct qib_verbs_counters *cntrs)
1428 {
1429 int ret;
1430
1431 if (!(ppd->dd->flags & QIB_PRESENT)) {
1432 /* no hardware, freeze, etc. */
1433 ret = -EINVAL;
1434 goto bail;
1435 }
1436 cntrs->symbol_error_counter =
1437 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBSYMBOLERR);
1438 cntrs->link_error_recovery_counter =
1439 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBLINKERRRECOV);
1440 /*
1441 * The link downed counter counts when the other side downs the
1442 * connection. We add in the number of times we downed the link
1443 * due to local link integrity errors to compensate.
1444 */
1445 cntrs->link_downed_counter =
1446 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBLINKDOWN);
1447 cntrs->port_rcv_errors =
1448 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXDROPPKT) +
1449 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RCVOVFL) +
1450 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERR_RLEN) +
1451 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_INVALIDRLEN) +
1452 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRLINK) +
1453 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRICRC) +
1454 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRVCRC) +
1455 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRLPCRC) +
1456 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_BADFORMAT);
1457 cntrs->port_rcv_errors +=
1458 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXLOCALPHYERR);
1459 cntrs->port_rcv_errors +=
1460 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXVLERR);
1461 cntrs->port_rcv_remphys_errors =
1462 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RCVEBP);
1463 cntrs->port_xmit_discards =
1464 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_UNSUPVL);
1465 cntrs->port_xmit_data = ppd->dd->f_portcntr(ppd,
1466 QIBPORTCNTR_WORDSEND);
1467 cntrs->port_rcv_data = ppd->dd->f_portcntr(ppd,
1468 QIBPORTCNTR_WORDRCV);
1469 cntrs->port_xmit_packets = ppd->dd->f_portcntr(ppd,
1470 QIBPORTCNTR_PKTSEND);
1471 cntrs->port_rcv_packets = ppd->dd->f_portcntr(ppd,
1472 QIBPORTCNTR_PKTRCV);
1473 cntrs->local_link_integrity_errors =
1474 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_LLI);
1475 cntrs->excessive_buffer_overrun_errors =
1476 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_EXCESSBUFOVFL);
1477 cntrs->vl15_dropped =
1478 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_VL15PKTDROP);
1479
1480 ret = 0;
1481
1482 bail:
1483 return ret;
1484 }
1485
1486 /**
1487 * qib_ib_piobufavail - callback when a PIO buffer is available
1488 * @dd: the device pointer
1489 *
1490 * This is called from qib_intr() at interrupt level when a PIO buffer is
1491 * available after qib_verbs_send() returned an error that no buffers were
1492 * available. Disable the interrupt if there are no more QPs waiting.
1493 */
1494 void qib_ib_piobufavail(struct qib_devdata *dd)
1495 {
1496 struct qib_ibdev *dev = &dd->verbs_dev;
1497 struct list_head *list;
1498 struct qib_qp *qps[5];
1499 struct qib_qp *qp;
1500 unsigned long flags;
1501 unsigned i, n;
1502
1503 list = &dev->piowait;
1504 n = 0;
1505
1506 /*
1507 * Note: checking that the piowait list is empty and clearing
1508 * the buffer available interrupt needs to be atomic or we
1509 * could end up with QPs on the wait list with the interrupt
1510 * disabled.
1511 */
1512 spin_lock_irqsave(&dev->pending_lock, flags);
1513 while (!list_empty(list)) {
1514 if (n == ARRAY_SIZE(qps))
1515 goto full;
1516 qp = list_entry(list->next, struct qib_qp, iowait);
1517 list_del_init(&qp->iowait);
1518 atomic_inc(&qp->refcount);
1519 qps[n++] = qp;
1520 }
1521 dd->f_wantpiobuf_intr(dd, 0);
1522 full:
1523 spin_unlock_irqrestore(&dev->pending_lock, flags);
1524
1525 for (i = 0; i < n; i++) {
1526 qp = qps[i];
1527
1528 spin_lock_irqsave(&qp->s_lock, flags);
1529 if (qp->s_flags & QIB_S_WAIT_PIO) {
1530 qp->s_flags &= ~QIB_S_WAIT_PIO;
1531 qib_schedule_send(qp);
1532 }
1533 spin_unlock_irqrestore(&qp->s_lock, flags);
1534
1535 /* Notify qib_destroy_qp() if it is waiting. */
1536 if (atomic_dec_and_test(&qp->refcount))
1537 wake_up(&qp->wait);
1538 }
1539 }
1540
1541 static int qib_query_device(struct ib_device *ibdev,
1542 struct ib_device_attr *props)
1543 {
1544 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1545 struct qib_ibdev *dev = to_idev(ibdev);
1546
1547 memset(props, 0, sizeof(*props));
1548
1549 props->device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
1550 IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
1551 IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_RC_RNR_NAK_GEN |
1552 IB_DEVICE_PORT_ACTIVE_EVENT | IB_DEVICE_SRQ_RESIZE;
1553 props->page_size_cap = PAGE_SIZE;
1554 props->vendor_id =
1555 QIB_SRC_OUI_1 << 16 | QIB_SRC_OUI_2 << 8 | QIB_SRC_OUI_3;
1556 props->vendor_part_id = dd->deviceid;
1557 props->hw_ver = dd->minrev;
1558 props->sys_image_guid = ib_qib_sys_image_guid;
1559 props->max_mr_size = ~0ULL;
1560 props->max_qp = ib_qib_max_qps;
1561 props->max_qp_wr = ib_qib_max_qp_wrs;
1562 props->max_sge = ib_qib_max_sges;
1563 props->max_cq = ib_qib_max_cqs;
1564 props->max_ah = ib_qib_max_ahs;
1565 props->max_cqe = ib_qib_max_cqes;
1566 props->max_mr = dev->lk_table.max;
1567 props->max_fmr = dev->lk_table.max;
1568 props->max_map_per_fmr = 32767;
1569 props->max_pd = ib_qib_max_pds;
1570 props->max_qp_rd_atom = QIB_MAX_RDMA_ATOMIC;
1571 props->max_qp_init_rd_atom = 255;
1572 /* props->max_res_rd_atom */
1573 props->max_srq = ib_qib_max_srqs;
1574 props->max_srq_wr = ib_qib_max_srq_wrs;
1575 props->max_srq_sge = ib_qib_max_srq_sges;
1576 /* props->local_ca_ack_delay */
1577 props->atomic_cap = IB_ATOMIC_GLOB;
1578 props->max_pkeys = qib_get_npkeys(dd);
1579 props->max_mcast_grp = ib_qib_max_mcast_grps;
1580 props->max_mcast_qp_attach = ib_qib_max_mcast_qp_attached;
1581 props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
1582 props->max_mcast_grp;
1583
1584 return 0;
1585 }
1586
1587 static int qib_query_port(struct ib_device *ibdev, u8 port,
1588 struct ib_port_attr *props)
1589 {
1590 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1591 struct qib_ibport *ibp = to_iport(ibdev, port);
1592 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1593 enum ib_mtu mtu;
1594 u16 lid = ppd->lid;
1595
1596 memset(props, 0, sizeof(*props));
1597 props->lid = lid ? lid : be16_to_cpu(IB_LID_PERMISSIVE);
1598 props->lmc = ppd->lmc;
1599 props->sm_lid = ibp->sm_lid;
1600 props->sm_sl = ibp->sm_sl;
1601 props->state = dd->f_iblink_state(ppd->lastibcstat);
1602 props->phys_state = dd->f_ibphys_portstate(ppd->lastibcstat);
1603 props->port_cap_flags = ibp->port_cap_flags;
1604 props->gid_tbl_len = QIB_GUIDS_PER_PORT;
1605 props->max_msg_sz = 0x80000000;
1606 props->pkey_tbl_len = qib_get_npkeys(dd);
1607 props->bad_pkey_cntr = ibp->pkey_violations;
1608 props->qkey_viol_cntr = ibp->qkey_violations;
1609 props->active_width = ppd->link_width_active;
1610 /* See rate_show() */
1611 props->active_speed = ppd->link_speed_active;
1612 props->max_vl_num = qib_num_vls(ppd->vls_supported);
1613 props->init_type_reply = 0;
1614
1615 props->max_mtu = qib_ibmtu ? qib_ibmtu : IB_MTU_4096;
1616 switch (ppd->ibmtu) {
1617 case 4096:
1618 mtu = IB_MTU_4096;
1619 break;
1620 case 2048:
1621 mtu = IB_MTU_2048;
1622 break;
1623 case 1024:
1624 mtu = IB_MTU_1024;
1625 break;
1626 case 512:
1627 mtu = IB_MTU_512;
1628 break;
1629 case 256:
1630 mtu = IB_MTU_256;
1631 break;
1632 default:
1633 mtu = IB_MTU_2048;
1634 }
1635 props->active_mtu = mtu;
1636 props->subnet_timeout = ibp->subnet_timeout;
1637
1638 return 0;
1639 }
1640
1641 static int qib_modify_device(struct ib_device *device,
1642 int device_modify_mask,
1643 struct ib_device_modify *device_modify)
1644 {
1645 struct qib_devdata *dd = dd_from_ibdev(device);
1646 unsigned i;
1647 int ret;
1648
1649 if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
1650 IB_DEVICE_MODIFY_NODE_DESC)) {
1651 ret = -EOPNOTSUPP;
1652 goto bail;
1653 }
1654
1655 if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC) {
1656 memcpy(device->node_desc, device_modify->node_desc, 64);
1657 for (i = 0; i < dd->num_pports; i++) {
1658 struct qib_ibport *ibp = &dd->pport[i].ibport_data;
1659
1660 qib_node_desc_chg(ibp);
1661 }
1662 }
1663
1664 if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) {
1665 ib_qib_sys_image_guid =
1666 cpu_to_be64(device_modify->sys_image_guid);
1667 for (i = 0; i < dd->num_pports; i++) {
1668 struct qib_ibport *ibp = &dd->pport[i].ibport_data;
1669
1670 qib_sys_guid_chg(ibp);
1671 }
1672 }
1673
1674 ret = 0;
1675
1676 bail:
1677 return ret;
1678 }
1679
1680 static int qib_modify_port(struct ib_device *ibdev, u8 port,
1681 int port_modify_mask, struct ib_port_modify *props)
1682 {
1683 struct qib_ibport *ibp = to_iport(ibdev, port);
1684 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1685
1686 ibp->port_cap_flags |= props->set_port_cap_mask;
1687 ibp->port_cap_flags &= ~props->clr_port_cap_mask;
1688 if (props->set_port_cap_mask || props->clr_port_cap_mask)
1689 qib_cap_mask_chg(ibp);
1690 if (port_modify_mask & IB_PORT_SHUTDOWN)
1691 qib_set_linkstate(ppd, QIB_IB_LINKDOWN);
1692 if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
1693 ibp->qkey_violations = 0;
1694 return 0;
1695 }
1696
1697 static int qib_query_gid(struct ib_device *ibdev, u8 port,
1698 int index, union ib_gid *gid)
1699 {
1700 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1701 int ret = 0;
1702
1703 if (!port || port > dd->num_pports)
1704 ret = -EINVAL;
1705 else {
1706 struct qib_ibport *ibp = to_iport(ibdev, port);
1707 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1708
1709 gid->global.subnet_prefix = ibp->gid_prefix;
1710 if (index == 0)
1711 gid->global.interface_id = ppd->guid;
1712 else if (index < QIB_GUIDS_PER_PORT)
1713 gid->global.interface_id = ibp->guids[index - 1];
1714 else
1715 ret = -EINVAL;
1716 }
1717
1718 return ret;
1719 }
1720
1721 static struct ib_pd *qib_alloc_pd(struct ib_device *ibdev,
1722 struct ib_ucontext *context,
1723 struct ib_udata *udata)
1724 {
1725 struct qib_ibdev *dev = to_idev(ibdev);
1726 struct qib_pd *pd;
1727 struct ib_pd *ret;
1728
1729 /*
1730 * This is actually totally arbitrary. Some correctness tests
1731 * assume there's a maximum number of PDs that can be allocated.
1732 * We don't actually have this limit, but we fail the test if
1733 * we allow allocations of more than we report for this value.
1734 */
1735
1736 pd = kmalloc(sizeof *pd, GFP_KERNEL);
1737 if (!pd) {
1738 ret = ERR_PTR(-ENOMEM);
1739 goto bail;
1740 }
1741
1742 spin_lock(&dev->n_pds_lock);
1743 if (dev->n_pds_allocated == ib_qib_max_pds) {
1744 spin_unlock(&dev->n_pds_lock);
1745 kfree(pd);
1746 ret = ERR_PTR(-ENOMEM);
1747 goto bail;
1748 }
1749
1750 dev->n_pds_allocated++;
1751 spin_unlock(&dev->n_pds_lock);
1752
1753 /* ib_alloc_pd() will initialize pd->ibpd. */
1754 pd->user = udata != NULL;
1755
1756 ret = &pd->ibpd;
1757
1758 bail:
1759 return ret;
1760 }
1761
1762 static int qib_dealloc_pd(struct ib_pd *ibpd)
1763 {
1764 struct qib_pd *pd = to_ipd(ibpd);
1765 struct qib_ibdev *dev = to_idev(ibpd->device);
1766
1767 spin_lock(&dev->n_pds_lock);
1768 dev->n_pds_allocated--;
1769 spin_unlock(&dev->n_pds_lock);
1770
1771 kfree(pd);
1772
1773 return 0;
1774 }
1775
1776 int qib_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr)
1777 {
1778 /* A multicast address requires a GRH (see ch. 8.4.1). */
1779 if (ah_attr->dlid >= QIB_MULTICAST_LID_BASE &&
1780 ah_attr->dlid != QIB_PERMISSIVE_LID &&
1781 !(ah_attr->ah_flags & IB_AH_GRH))
1782 goto bail;
1783 if ((ah_attr->ah_flags & IB_AH_GRH) &&
1784 ah_attr->grh.sgid_index >= QIB_GUIDS_PER_PORT)
1785 goto bail;
1786 if (ah_attr->dlid == 0)
1787 goto bail;
1788 if (ah_attr->port_num < 1 ||
1789 ah_attr->port_num > ibdev->phys_port_cnt)
1790 goto bail;
1791 if (ah_attr->static_rate != IB_RATE_PORT_CURRENT &&
1792 ib_rate_to_mult(ah_attr->static_rate) < 0)
1793 goto bail;
1794 if (ah_attr->sl > 15)
1795 goto bail;
1796 return 0;
1797 bail:
1798 return -EINVAL;
1799 }
1800
1801 /**
1802 * qib_create_ah - create an address handle
1803 * @pd: the protection domain
1804 * @ah_attr: the attributes of the AH
1805 *
1806 * This may be called from interrupt context.
1807 */
1808 static struct ib_ah *qib_create_ah(struct ib_pd *pd,
1809 struct ib_ah_attr *ah_attr)
1810 {
1811 struct qib_ah *ah;
1812 struct ib_ah *ret;
1813 struct qib_ibdev *dev = to_idev(pd->device);
1814 unsigned long flags;
1815
1816 if (qib_check_ah(pd->device, ah_attr)) {
1817 ret = ERR_PTR(-EINVAL);
1818 goto bail;
1819 }
1820
1821 ah = kmalloc(sizeof *ah, GFP_ATOMIC);
1822 if (!ah) {
1823 ret = ERR_PTR(-ENOMEM);
1824 goto bail;
1825 }
1826
1827 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1828 if (dev->n_ahs_allocated == ib_qib_max_ahs) {
1829 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1830 kfree(ah);
1831 ret = ERR_PTR(-ENOMEM);
1832 goto bail;
1833 }
1834
1835 dev->n_ahs_allocated++;
1836 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1837
1838 /* ib_create_ah() will initialize ah->ibah. */
1839 ah->attr = *ah_attr;
1840 atomic_set(&ah->refcount, 0);
1841
1842 ret = &ah->ibah;
1843
1844 bail:
1845 return ret;
1846 }
1847
1848 /**
1849 * qib_destroy_ah - destroy an address handle
1850 * @ibah: the AH to destroy
1851 *
1852 * This may be called from interrupt context.
1853 */
1854 static int qib_destroy_ah(struct ib_ah *ibah)
1855 {
1856 struct qib_ibdev *dev = to_idev(ibah->device);
1857 struct qib_ah *ah = to_iah(ibah);
1858 unsigned long flags;
1859
1860 if (atomic_read(&ah->refcount) != 0)
1861 return -EBUSY;
1862
1863 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1864 dev->n_ahs_allocated--;
1865 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1866
1867 kfree(ah);
1868
1869 return 0;
1870 }
1871
1872 static int qib_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1873 {
1874 struct qib_ah *ah = to_iah(ibah);
1875
1876 if (qib_check_ah(ibah->device, ah_attr))
1877 return -EINVAL;
1878
1879 ah->attr = *ah_attr;
1880
1881 return 0;
1882 }
1883
1884 static int qib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1885 {
1886 struct qib_ah *ah = to_iah(ibah);
1887
1888 *ah_attr = ah->attr;
1889
1890 return 0;
1891 }
1892
1893 /**
1894 * qib_get_npkeys - return the size of the PKEY table for context 0
1895 * @dd: the qlogic_ib device
1896 */
1897 unsigned qib_get_npkeys(struct qib_devdata *dd)
1898 {
1899 return ARRAY_SIZE(dd->rcd[0]->pkeys);
1900 }
1901
1902 /*
1903 * Return the indexed PKEY from the port PKEY table.
1904 * No need to validate rcd[ctxt]; the port is setup if we are here.
1905 */
1906 unsigned qib_get_pkey(struct qib_ibport *ibp, unsigned index)
1907 {
1908 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1909 struct qib_devdata *dd = ppd->dd;
1910 unsigned ctxt = ppd->hw_pidx;
1911 unsigned ret;
1912
1913 /* dd->rcd null if mini_init or some init failures */
1914 if (!dd->rcd || index >= ARRAY_SIZE(dd->rcd[ctxt]->pkeys))
1915 ret = 0;
1916 else
1917 ret = dd->rcd[ctxt]->pkeys[index];
1918
1919 return ret;
1920 }
1921
1922 static int qib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
1923 u16 *pkey)
1924 {
1925 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1926 int ret;
1927
1928 if (index >= qib_get_npkeys(dd)) {
1929 ret = -EINVAL;
1930 goto bail;
1931 }
1932
1933 *pkey = qib_get_pkey(to_iport(ibdev, port), index);
1934 ret = 0;
1935
1936 bail:
1937 return ret;
1938 }
1939
1940 /**
1941 * qib_alloc_ucontext - allocate a ucontest
1942 * @ibdev: the infiniband device
1943 * @udata: not used by the QLogic_IB driver
1944 */
1945
1946 static struct ib_ucontext *qib_alloc_ucontext(struct ib_device *ibdev,
1947 struct ib_udata *udata)
1948 {
1949 struct qib_ucontext *context;
1950 struct ib_ucontext *ret;
1951
1952 context = kmalloc(sizeof *context, GFP_KERNEL);
1953 if (!context) {
1954 ret = ERR_PTR(-ENOMEM);
1955 goto bail;
1956 }
1957
1958 ret = &context->ibucontext;
1959
1960 bail:
1961 return ret;
1962 }
1963
1964 static int qib_dealloc_ucontext(struct ib_ucontext *context)
1965 {
1966 kfree(to_iucontext(context));
1967 return 0;
1968 }
1969
1970 static void init_ibport(struct qib_pportdata *ppd)
1971 {
1972 struct qib_verbs_counters cntrs;
1973 struct qib_ibport *ibp = &ppd->ibport_data;
1974
1975 spin_lock_init(&ibp->lock);
1976 /* Set the prefix to the default value (see ch. 4.1.1) */
1977 ibp->gid_prefix = IB_DEFAULT_GID_PREFIX;
1978 ibp->sm_lid = be16_to_cpu(IB_LID_PERMISSIVE);
1979 ibp->port_cap_flags = IB_PORT_SYS_IMAGE_GUID_SUP |
1980 IB_PORT_CLIENT_REG_SUP | IB_PORT_SL_MAP_SUP |
1981 IB_PORT_TRAP_SUP | IB_PORT_AUTO_MIGR_SUP |
1982 IB_PORT_DR_NOTICE_SUP | IB_PORT_CAP_MASK_NOTICE_SUP |
1983 IB_PORT_OTHER_LOCAL_CHANGES_SUP;
1984 if (ppd->dd->flags & QIB_HAS_LINK_LATENCY)
1985 ibp->port_cap_flags |= IB_PORT_LINK_LATENCY_SUP;
1986 ibp->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
1987 ibp->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
1988 ibp->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
1989 ibp->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
1990 ibp->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
1991
1992 /* Snapshot current HW counters to "clear" them. */
1993 qib_get_counters(ppd, &cntrs);
1994 ibp->z_symbol_error_counter = cntrs.symbol_error_counter;
1995 ibp->z_link_error_recovery_counter =
1996 cntrs.link_error_recovery_counter;
1997 ibp->z_link_downed_counter = cntrs.link_downed_counter;
1998 ibp->z_port_rcv_errors = cntrs.port_rcv_errors;
1999 ibp->z_port_rcv_remphys_errors = cntrs.port_rcv_remphys_errors;
2000 ibp->z_port_xmit_discards = cntrs.port_xmit_discards;
2001 ibp->z_port_xmit_data = cntrs.port_xmit_data;
2002 ibp->z_port_rcv_data = cntrs.port_rcv_data;
2003 ibp->z_port_xmit_packets = cntrs.port_xmit_packets;
2004 ibp->z_port_rcv_packets = cntrs.port_rcv_packets;
2005 ibp->z_local_link_integrity_errors =
2006 cntrs.local_link_integrity_errors;
2007 ibp->z_excessive_buffer_overrun_errors =
2008 cntrs.excessive_buffer_overrun_errors;
2009 ibp->z_vl15_dropped = cntrs.vl15_dropped;
2010 RCU_INIT_POINTER(ibp->qp0, NULL);
2011 RCU_INIT_POINTER(ibp->qp1, NULL);
2012 }
2013
2014 /**
2015 * qib_register_ib_device - register our device with the infiniband core
2016 * @dd: the device data structure
2017 * Return the allocated qib_ibdev pointer or NULL on error.
2018 */
2019 int qib_register_ib_device(struct qib_devdata *dd)
2020 {
2021 struct qib_ibdev *dev = &dd->verbs_dev;
2022 struct ib_device *ibdev = &dev->ibdev;
2023 struct qib_pportdata *ppd = dd->pport;
2024 unsigned i, lk_tab_size;
2025 int ret;
2026
2027 dev->qp_table_size = ib_qib_qp_table_size;
2028 get_random_bytes(&dev->qp_rnd, sizeof(dev->qp_rnd));
2029 dev->qp_table = kmalloc(dev->qp_table_size * sizeof *dev->qp_table,
2030 GFP_KERNEL);
2031 if (!dev->qp_table) {
2032 ret = -ENOMEM;
2033 goto err_qpt;
2034 }
2035 for (i = 0; i < dev->qp_table_size; i++)
2036 RCU_INIT_POINTER(dev->qp_table[i], NULL);
2037
2038 for (i = 0; i < dd->num_pports; i++)
2039 init_ibport(ppd + i);
2040
2041 /* Only need to initialize non-zero fields. */
2042 spin_lock_init(&dev->qpt_lock);
2043 spin_lock_init(&dev->n_pds_lock);
2044 spin_lock_init(&dev->n_ahs_lock);
2045 spin_lock_init(&dev->n_cqs_lock);
2046 spin_lock_init(&dev->n_qps_lock);
2047 spin_lock_init(&dev->n_srqs_lock);
2048 spin_lock_init(&dev->n_mcast_grps_lock);
2049 init_timer(&dev->mem_timer);
2050 dev->mem_timer.function = mem_timer;
2051 dev->mem_timer.data = (unsigned long) dev;
2052
2053 qib_init_qpn_table(dd, &dev->qpn_table);
2054
2055 /*
2056 * The top ib_qib_lkey_table_size bits are used to index the
2057 * table. The lower 8 bits can be owned by the user (copied from
2058 * the LKEY). The remaining bits act as a generation number or tag.
2059 */
2060 spin_lock_init(&dev->lk_table.lock);
2061 dev->lk_table.max = 1 << ib_qib_lkey_table_size;
2062 lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
2063 dev->lk_table.table = (struct qib_mregion **)
2064 __get_free_pages(GFP_KERNEL, get_order(lk_tab_size));
2065 if (dev->lk_table.table == NULL) {
2066 ret = -ENOMEM;
2067 goto err_lk;
2068 }
2069 memset(dev->lk_table.table, 0, lk_tab_size);
2070 INIT_LIST_HEAD(&dev->pending_mmaps);
2071 spin_lock_init(&dev->pending_lock);
2072 dev->mmap_offset = PAGE_SIZE;
2073 spin_lock_init(&dev->mmap_offset_lock);
2074 INIT_LIST_HEAD(&dev->piowait);
2075 INIT_LIST_HEAD(&dev->dmawait);
2076 INIT_LIST_HEAD(&dev->txwait);
2077 INIT_LIST_HEAD(&dev->memwait);
2078 INIT_LIST_HEAD(&dev->txreq_free);
2079
2080 if (ppd->sdma_descq_cnt) {
2081 dev->pio_hdrs = dma_alloc_coherent(&dd->pcidev->dev,
2082 ppd->sdma_descq_cnt *
2083 sizeof(struct qib_pio_header),
2084 &dev->pio_hdrs_phys,
2085 GFP_KERNEL);
2086 if (!dev->pio_hdrs) {
2087 ret = -ENOMEM;
2088 goto err_hdrs;
2089 }
2090 }
2091
2092 for (i = 0; i < ppd->sdma_descq_cnt; i++) {
2093 struct qib_verbs_txreq *tx;
2094
2095 tx = kzalloc(sizeof *tx, GFP_KERNEL);
2096 if (!tx) {
2097 ret = -ENOMEM;
2098 goto err_tx;
2099 }
2100 tx->hdr_inx = i;
2101 list_add(&tx->txreq.list, &dev->txreq_free);
2102 }
2103
2104 /*
2105 * The system image GUID is supposed to be the same for all
2106 * IB HCAs in a single system but since there can be other
2107 * device types in the system, we can't be sure this is unique.
2108 */
2109 if (!ib_qib_sys_image_guid)
2110 ib_qib_sys_image_guid = ppd->guid;
2111
2112 strlcpy(ibdev->name, "qib%d", IB_DEVICE_NAME_MAX);
2113 ibdev->owner = THIS_MODULE;
2114 ibdev->node_guid = ppd->guid;
2115 ibdev->uverbs_abi_ver = QIB_UVERBS_ABI_VERSION;
2116 ibdev->uverbs_cmd_mask =
2117 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
2118 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
2119 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
2120 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
2121 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
2122 (1ull << IB_USER_VERBS_CMD_CREATE_AH) |
2123 (1ull << IB_USER_VERBS_CMD_MODIFY_AH) |
2124 (1ull << IB_USER_VERBS_CMD_QUERY_AH) |
2125 (1ull << IB_USER_VERBS_CMD_DESTROY_AH) |
2126 (1ull << IB_USER_VERBS_CMD_REG_MR) |
2127 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
2128 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
2129 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
2130 (1ull << IB_USER_VERBS_CMD_RESIZE_CQ) |
2131 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
2132 (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
2133 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
2134 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
2135 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
2136 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
2137 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
2138 (1ull << IB_USER_VERBS_CMD_POST_SEND) |
2139 (1ull << IB_USER_VERBS_CMD_POST_RECV) |
2140 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
2141 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
2142 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
2143 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
2144 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
2145 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ) |
2146 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
2147 ibdev->node_type = RDMA_NODE_IB_CA;
2148 ibdev->phys_port_cnt = dd->num_pports;
2149 ibdev->num_comp_vectors = 1;
2150 ibdev->dma_device = &dd->pcidev->dev;
2151 ibdev->query_device = qib_query_device;
2152 ibdev->modify_device = qib_modify_device;
2153 ibdev->query_port = qib_query_port;
2154 ibdev->modify_port = qib_modify_port;
2155 ibdev->query_pkey = qib_query_pkey;
2156 ibdev->query_gid = qib_query_gid;
2157 ibdev->alloc_ucontext = qib_alloc_ucontext;
2158 ibdev->dealloc_ucontext = qib_dealloc_ucontext;
2159 ibdev->alloc_pd = qib_alloc_pd;
2160 ibdev->dealloc_pd = qib_dealloc_pd;
2161 ibdev->create_ah = qib_create_ah;
2162 ibdev->destroy_ah = qib_destroy_ah;
2163 ibdev->modify_ah = qib_modify_ah;
2164 ibdev->query_ah = qib_query_ah;
2165 ibdev->create_srq = qib_create_srq;
2166 ibdev->modify_srq = qib_modify_srq;
2167 ibdev->query_srq = qib_query_srq;
2168 ibdev->destroy_srq = qib_destroy_srq;
2169 ibdev->create_qp = qib_create_qp;
2170 ibdev->modify_qp = qib_modify_qp;
2171 ibdev->query_qp = qib_query_qp;
2172 ibdev->destroy_qp = qib_destroy_qp;
2173 ibdev->post_send = qib_post_send;
2174 ibdev->post_recv = qib_post_receive;
2175 ibdev->post_srq_recv = qib_post_srq_receive;
2176 ibdev->create_cq = qib_create_cq;
2177 ibdev->destroy_cq = qib_destroy_cq;
2178 ibdev->resize_cq = qib_resize_cq;
2179 ibdev->poll_cq = qib_poll_cq;
2180 ibdev->req_notify_cq = qib_req_notify_cq;
2181 ibdev->get_dma_mr = qib_get_dma_mr;
2182 ibdev->reg_phys_mr = qib_reg_phys_mr;
2183 ibdev->reg_user_mr = qib_reg_user_mr;
2184 ibdev->dereg_mr = qib_dereg_mr;
2185 ibdev->alloc_fast_reg_mr = qib_alloc_fast_reg_mr;
2186 ibdev->alloc_fast_reg_page_list = qib_alloc_fast_reg_page_list;
2187 ibdev->free_fast_reg_page_list = qib_free_fast_reg_page_list;
2188 ibdev->alloc_fmr = qib_alloc_fmr;
2189 ibdev->map_phys_fmr = qib_map_phys_fmr;
2190 ibdev->unmap_fmr = qib_unmap_fmr;
2191 ibdev->dealloc_fmr = qib_dealloc_fmr;
2192 ibdev->attach_mcast = qib_multicast_attach;
2193 ibdev->detach_mcast = qib_multicast_detach;
2194 ibdev->process_mad = qib_process_mad;
2195 ibdev->mmap = qib_mmap;
2196 ibdev->dma_ops = &qib_dma_mapping_ops;
2197
2198 snprintf(ibdev->node_desc, sizeof(ibdev->node_desc),
2199 QIB_IDSTR " %s", init_utsname()->nodename);
2200
2201 ret = ib_register_device(ibdev, qib_create_port_files);
2202 if (ret)
2203 goto err_reg;
2204
2205 ret = qib_create_agents(dev);
2206 if (ret)
2207 goto err_agents;
2208
2209 if (qib_verbs_register_sysfs(dd))
2210 goto err_class;
2211
2212 goto bail;
2213
2214 err_class:
2215 qib_free_agents(dev);
2216 err_agents:
2217 ib_unregister_device(ibdev);
2218 err_reg:
2219 err_tx:
2220 while (!list_empty(&dev->txreq_free)) {
2221 struct list_head *l = dev->txreq_free.next;
2222 struct qib_verbs_txreq *tx;
2223
2224 list_del(l);
2225 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
2226 kfree(tx);
2227 }
2228 if (ppd->sdma_descq_cnt)
2229 dma_free_coherent(&dd->pcidev->dev,
2230 ppd->sdma_descq_cnt *
2231 sizeof(struct qib_pio_header),
2232 dev->pio_hdrs, dev->pio_hdrs_phys);
2233 err_hdrs:
2234 free_pages((unsigned long) dev->lk_table.table, get_order(lk_tab_size));
2235 err_lk:
2236 kfree(dev->qp_table);
2237 err_qpt:
2238 qib_dev_err(dd, "cannot register verbs: %d!\n", -ret);
2239 bail:
2240 return ret;
2241 }
2242
2243 void qib_unregister_ib_device(struct qib_devdata *dd)
2244 {
2245 struct qib_ibdev *dev = &dd->verbs_dev;
2246 struct ib_device *ibdev = &dev->ibdev;
2247 u32 qps_inuse;
2248 unsigned lk_tab_size;
2249
2250 qib_verbs_unregister_sysfs(dd);
2251
2252 qib_free_agents(dev);
2253
2254 ib_unregister_device(ibdev);
2255
2256 if (!list_empty(&dev->piowait))
2257 qib_dev_err(dd, "piowait list not empty!\n");
2258 if (!list_empty(&dev->dmawait))
2259 qib_dev_err(dd, "dmawait list not empty!\n");
2260 if (!list_empty(&dev->txwait))
2261 qib_dev_err(dd, "txwait list not empty!\n");
2262 if (!list_empty(&dev->memwait))
2263 qib_dev_err(dd, "memwait list not empty!\n");
2264 if (dev->dma_mr)
2265 qib_dev_err(dd, "DMA MR not NULL!\n");
2266
2267 qps_inuse = qib_free_all_qps(dd);
2268 if (qps_inuse)
2269 qib_dev_err(dd, "QP memory leak! %u still in use\n",
2270 qps_inuse);
2271
2272 del_timer_sync(&dev->mem_timer);
2273 qib_free_qpn_table(&dev->qpn_table);
2274 while (!list_empty(&dev->txreq_free)) {
2275 struct list_head *l = dev->txreq_free.next;
2276 struct qib_verbs_txreq *tx;
2277
2278 list_del(l);
2279 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
2280 kfree(tx);
2281 }
2282 if (dd->pport->sdma_descq_cnt)
2283 dma_free_coherent(&dd->pcidev->dev,
2284 dd->pport->sdma_descq_cnt *
2285 sizeof(struct qib_pio_header),
2286 dev->pio_hdrs, dev->pio_hdrs_phys);
2287 lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
2288 free_pages((unsigned long) dev->lk_table.table,
2289 get_order(lk_tab_size));
2290 kfree(dev->qp_table);
2291 }
Linus' kernel tree