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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[people/ms/linux.git] / drivers / infiniband / hw / qib / qib_verbs.c
1 /*
2 * Copyright (c) 2012, 2013 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006 - 2012 QLogic Corporation. 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 #include <linux/vmalloc.h>
44
45 #include "qib.h"
46 #include "qib_common.h"
47
48 static unsigned int ib_qib_qp_table_size = 256;
49 module_param_named(qp_table_size, ib_qib_qp_table_size, uint, S_IRUGO);
50 MODULE_PARM_DESC(qp_table_size, "QP table size");
51
52 unsigned int ib_qib_lkey_table_size = 16;
53 module_param_named(lkey_table_size, ib_qib_lkey_table_size, uint,
54 S_IRUGO);
55 MODULE_PARM_DESC(lkey_table_size,
56 "LKEY table size in bits (2^n, 1 <= n <= 23)");
57
58 static unsigned int ib_qib_max_pds = 0xFFFF;
59 module_param_named(max_pds, ib_qib_max_pds, uint, S_IRUGO);
60 MODULE_PARM_DESC(max_pds,
61 "Maximum number of protection domains to support");
62
63 static unsigned int ib_qib_max_ahs = 0xFFFF;
64 module_param_named(max_ahs, ib_qib_max_ahs, uint, S_IRUGO);
65 MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");
66
67 unsigned int ib_qib_max_cqes = 0x2FFFF;
68 module_param_named(max_cqes, ib_qib_max_cqes, uint, S_IRUGO);
69 MODULE_PARM_DESC(max_cqes,
70 "Maximum number of completion queue entries to support");
71
72 unsigned int ib_qib_max_cqs = 0x1FFFF;
73 module_param_named(max_cqs, ib_qib_max_cqs, uint, S_IRUGO);
74 MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");
75
76 unsigned int ib_qib_max_qp_wrs = 0x3FFF;
77 module_param_named(max_qp_wrs, ib_qib_max_qp_wrs, uint, S_IRUGO);
78 MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");
79
80 unsigned int ib_qib_max_qps = 16384;
81 module_param_named(max_qps, ib_qib_max_qps, uint, S_IRUGO);
82 MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");
83
84 unsigned int ib_qib_max_sges = 0x60;
85 module_param_named(max_sges, ib_qib_max_sges, uint, S_IRUGO);
86 MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");
87
88 unsigned int ib_qib_max_mcast_grps = 16384;
89 module_param_named(max_mcast_grps, ib_qib_max_mcast_grps, uint, S_IRUGO);
90 MODULE_PARM_DESC(max_mcast_grps,
91 "Maximum number of multicast groups to support");
92
93 unsigned int ib_qib_max_mcast_qp_attached = 16;
94 module_param_named(max_mcast_qp_attached, ib_qib_max_mcast_qp_attached,
95 uint, S_IRUGO);
96 MODULE_PARM_DESC(max_mcast_qp_attached,
97 "Maximum number of attached QPs to support");
98
99 unsigned int ib_qib_max_srqs = 1024;
100 module_param_named(max_srqs, ib_qib_max_srqs, uint, S_IRUGO);
101 MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");
102
103 unsigned int ib_qib_max_srq_sges = 128;
104 module_param_named(max_srq_sges, ib_qib_max_srq_sges, uint, S_IRUGO);
105 MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");
106
107 unsigned int ib_qib_max_srq_wrs = 0x1FFFF;
108 module_param_named(max_srq_wrs, ib_qib_max_srq_wrs, uint, S_IRUGO);
109 MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");
110
111 static unsigned int ib_qib_disable_sma;
112 module_param_named(disable_sma, ib_qib_disable_sma, uint, S_IWUSR | S_IRUGO);
113 MODULE_PARM_DESC(disable_sma, "Disable the SMA");
114
115 /*
116 * Note that it is OK to post send work requests in the SQE and ERR
117 * states; qib_do_send() will process them and generate error
118 * completions as per IB 1.2 C10-96.
119 */
120 const int ib_qib_state_ops[IB_QPS_ERR + 1] = {
121 [IB_QPS_RESET] = 0,
122 [IB_QPS_INIT] = QIB_POST_RECV_OK,
123 [IB_QPS_RTR] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK,
124 [IB_QPS_RTS] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
125 QIB_POST_SEND_OK | QIB_PROCESS_SEND_OK |
126 QIB_PROCESS_NEXT_SEND_OK,
127 [IB_QPS_SQD] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
128 QIB_POST_SEND_OK | QIB_PROCESS_SEND_OK,
129 [IB_QPS_SQE] = QIB_POST_RECV_OK | QIB_PROCESS_RECV_OK |
130 QIB_POST_SEND_OK | QIB_FLUSH_SEND,
131 [IB_QPS_ERR] = QIB_POST_RECV_OK | QIB_FLUSH_RECV |
132 QIB_POST_SEND_OK | QIB_FLUSH_SEND,
133 };
134
135 struct qib_ucontext {
136 struct ib_ucontext ibucontext;
137 };
138
139 static inline struct qib_ucontext *to_iucontext(struct ib_ucontext
140 *ibucontext)
141 {
142 return container_of(ibucontext, struct qib_ucontext, ibucontext);
143 }
144
145 /*
146 * Translate ib_wr_opcode into ib_wc_opcode.
147 */
148 const enum ib_wc_opcode ib_qib_wc_opcode[] = {
149 [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
150 [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
151 [IB_WR_SEND] = IB_WC_SEND,
152 [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
153 [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
154 [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
155 [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD
156 };
157
158 /*
159 * System image GUID.
160 */
161 __be64 ib_qib_sys_image_guid;
162
163 /**
164 * qib_copy_sge - copy data to SGE memory
165 * @ss: the SGE state
166 * @data: the data to copy
167 * @length: the length of the data
168 */
169 void qib_copy_sge(struct qib_sge_state *ss, void *data, u32 length, int release)
170 {
171 struct qib_sge *sge = &ss->sge;
172
173 while (length) {
174 u32 len = sge->length;
175
176 if (len > length)
177 len = length;
178 if (len > sge->sge_length)
179 len = sge->sge_length;
180 BUG_ON(len == 0);
181 memcpy(sge->vaddr, data, len);
182 sge->vaddr += len;
183 sge->length -= len;
184 sge->sge_length -= len;
185 if (sge->sge_length == 0) {
186 if (release)
187 qib_put_mr(sge->mr);
188 if (--ss->num_sge)
189 *sge = *ss->sg_list++;
190 } else if (sge->length == 0 && sge->mr->lkey) {
191 if (++sge->n >= QIB_SEGSZ) {
192 if (++sge->m >= sge->mr->mapsz)
193 break;
194 sge->n = 0;
195 }
196 sge->vaddr =
197 sge->mr->map[sge->m]->segs[sge->n].vaddr;
198 sge->length =
199 sge->mr->map[sge->m]->segs[sge->n].length;
200 }
201 data += len;
202 length -= len;
203 }
204 }
205
206 /**
207 * qib_skip_sge - skip over SGE memory - XXX almost dup of prev func
208 * @ss: the SGE state
209 * @length: the number of bytes to skip
210 */
211 void qib_skip_sge(struct qib_sge_state *ss, u32 length, int release)
212 {
213 struct qib_sge *sge = &ss->sge;
214
215 while (length) {
216 u32 len = sge->length;
217
218 if (len > length)
219 len = length;
220 if (len > sge->sge_length)
221 len = sge->sge_length;
222 BUG_ON(len == 0);
223 sge->vaddr += len;
224 sge->length -= len;
225 sge->sge_length -= len;
226 if (sge->sge_length == 0) {
227 if (release)
228 qib_put_mr(sge->mr);
229 if (--ss->num_sge)
230 *sge = *ss->sg_list++;
231 } else if (sge->length == 0 && sge->mr->lkey) {
232 if (++sge->n >= QIB_SEGSZ) {
233 if (++sge->m >= sge->mr->mapsz)
234 break;
235 sge->n = 0;
236 }
237 sge->vaddr =
238 sge->mr->map[sge->m]->segs[sge->n].vaddr;
239 sge->length =
240 sge->mr->map[sge->m]->segs[sge->n].length;
241 }
242 length -= len;
243 }
244 }
245
246 /*
247 * Count the number of DMA descriptors needed to send length bytes of data.
248 * Don't modify the qib_sge_state to get the count.
249 * Return zero if any of the segments is not aligned.
250 */
251 static u32 qib_count_sge(struct qib_sge_state *ss, u32 length)
252 {
253 struct qib_sge *sg_list = ss->sg_list;
254 struct qib_sge sge = ss->sge;
255 u8 num_sge = ss->num_sge;
256 u32 ndesc = 1; /* count the header */
257
258 while (length) {
259 u32 len = sge.length;
260
261 if (len > length)
262 len = length;
263 if (len > sge.sge_length)
264 len = sge.sge_length;
265 BUG_ON(len == 0);
266 if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
267 (len != length && (len & (sizeof(u32) - 1)))) {
268 ndesc = 0;
269 break;
270 }
271 ndesc++;
272 sge.vaddr += len;
273 sge.length -= len;
274 sge.sge_length -= len;
275 if (sge.sge_length == 0) {
276 if (--num_sge)
277 sge = *sg_list++;
278 } else if (sge.length == 0 && sge.mr->lkey) {
279 if (++sge.n >= QIB_SEGSZ) {
280 if (++sge.m >= sge.mr->mapsz)
281 break;
282 sge.n = 0;
283 }
284 sge.vaddr =
285 sge.mr->map[sge.m]->segs[sge.n].vaddr;
286 sge.length =
287 sge.mr->map[sge.m]->segs[sge.n].length;
288 }
289 length -= len;
290 }
291 return ndesc;
292 }
293
294 /*
295 * Copy from the SGEs to the data buffer.
296 */
297 static void qib_copy_from_sge(void *data, struct qib_sge_state *ss, u32 length)
298 {
299 struct qib_sge *sge = &ss->sge;
300
301 while (length) {
302 u32 len = sge->length;
303
304 if (len > length)
305 len = length;
306 if (len > sge->sge_length)
307 len = sge->sge_length;
308 BUG_ON(len == 0);
309 memcpy(data, sge->vaddr, len);
310 sge->vaddr += len;
311 sge->length -= len;
312 sge->sge_length -= len;
313 if (sge->sge_length == 0) {
314 if (--ss->num_sge)
315 *sge = *ss->sg_list++;
316 } else if (sge->length == 0 && sge->mr->lkey) {
317 if (++sge->n >= QIB_SEGSZ) {
318 if (++sge->m >= sge->mr->mapsz)
319 break;
320 sge->n = 0;
321 }
322 sge->vaddr =
323 sge->mr->map[sge->m]->segs[sge->n].vaddr;
324 sge->length =
325 sge->mr->map[sge->m]->segs[sge->n].length;
326 }
327 data += len;
328 length -= len;
329 }
330 }
331
332 /**
333 * qib_post_one_send - post one RC, UC, or UD send work request
334 * @qp: the QP to post on
335 * @wr: the work request to send
336 */
337 static int qib_post_one_send(struct qib_qp *qp, struct ib_send_wr *wr,
338 int *scheduled)
339 {
340 struct qib_swqe *wqe;
341 u32 next;
342 int i;
343 int j;
344 int acc;
345 int ret;
346 unsigned long flags;
347 struct qib_lkey_table *rkt;
348 struct qib_pd *pd;
349
350 spin_lock_irqsave(&qp->s_lock, flags);
351
352 /* Check that state is OK to post send. */
353 if (unlikely(!(ib_qib_state_ops[qp->state] & QIB_POST_SEND_OK)))
354 goto bail_inval;
355
356 /* IB spec says that num_sge == 0 is OK. */
357 if (wr->num_sge > qp->s_max_sge)
358 goto bail_inval;
359
360 /*
361 * Don't allow RDMA reads or atomic operations on UC or
362 * undefined operations.
363 * Make sure buffer is large enough to hold the result for atomics.
364 */
365 if (wr->opcode == IB_WR_FAST_REG_MR) {
366 if (qib_fast_reg_mr(qp, wr))
367 goto bail_inval;
368 } else if (qp->ibqp.qp_type == IB_QPT_UC) {
369 if ((unsigned) wr->opcode >= IB_WR_RDMA_READ)
370 goto bail_inval;
371 } else if (qp->ibqp.qp_type != IB_QPT_RC) {
372 /* Check IB_QPT_SMI, IB_QPT_GSI, IB_QPT_UD opcode */
373 if (wr->opcode != IB_WR_SEND &&
374 wr->opcode != IB_WR_SEND_WITH_IMM)
375 goto bail_inval;
376 /* Check UD destination address PD */
377 if (qp->ibqp.pd != wr->wr.ud.ah->pd)
378 goto bail_inval;
379 } else if ((unsigned) wr->opcode > IB_WR_ATOMIC_FETCH_AND_ADD)
380 goto bail_inval;
381 else if (wr->opcode >= IB_WR_ATOMIC_CMP_AND_SWP &&
382 (wr->num_sge == 0 ||
383 wr->sg_list[0].length < sizeof(u64) ||
384 wr->sg_list[0].addr & (sizeof(u64) - 1)))
385 goto bail_inval;
386 else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic)
387 goto bail_inval;
388
389 next = qp->s_head + 1;
390 if (next >= qp->s_size)
391 next = 0;
392 if (next == qp->s_last) {
393 ret = -ENOMEM;
394 goto bail;
395 }
396
397 rkt = &to_idev(qp->ibqp.device)->lk_table;
398 pd = to_ipd(qp->ibqp.pd);
399 wqe = get_swqe_ptr(qp, qp->s_head);
400 wqe->wr = *wr;
401 wqe->length = 0;
402 j = 0;
403 if (wr->num_sge) {
404 acc = wr->opcode >= IB_WR_RDMA_READ ?
405 IB_ACCESS_LOCAL_WRITE : 0;
406 for (i = 0; i < wr->num_sge; i++) {
407 u32 length = wr->sg_list[i].length;
408 int ok;
409
410 if (length == 0)
411 continue;
412 ok = qib_lkey_ok(rkt, pd, &wqe->sg_list[j],
413 &wr->sg_list[i], acc);
414 if (!ok)
415 goto bail_inval_free;
416 wqe->length += length;
417 j++;
418 }
419 wqe->wr.num_sge = j;
420 }
421 if (qp->ibqp.qp_type == IB_QPT_UC ||
422 qp->ibqp.qp_type == IB_QPT_RC) {
423 if (wqe->length > 0x80000000U)
424 goto bail_inval_free;
425 } else if (wqe->length > (dd_from_ibdev(qp->ibqp.device)->pport +
426 qp->port_num - 1)->ibmtu)
427 goto bail_inval_free;
428 else
429 atomic_inc(&to_iah(wr->wr.ud.ah)->refcount);
430 wqe->ssn = qp->s_ssn++;
431 qp->s_head = next;
432
433 ret = 0;
434 goto bail;
435
436 bail_inval_free:
437 while (j) {
438 struct qib_sge *sge = &wqe->sg_list[--j];
439
440 qib_put_mr(sge->mr);
441 }
442 bail_inval:
443 ret = -EINVAL;
444 bail:
445 if (!ret && !wr->next &&
446 !qib_sdma_empty(
447 dd_from_ibdev(qp->ibqp.device)->pport + qp->port_num - 1)) {
448 qib_schedule_send(qp);
449 *scheduled = 1;
450 }
451 spin_unlock_irqrestore(&qp->s_lock, flags);
452 return ret;
453 }
454
455 /**
456 * qib_post_send - post a send on a QP
457 * @ibqp: the QP to post the send on
458 * @wr: the list of work requests to post
459 * @bad_wr: the first bad WR is put here
460 *
461 * This may be called from interrupt context.
462 */
463 static int qib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
464 struct ib_send_wr **bad_wr)
465 {
466 struct qib_qp *qp = to_iqp(ibqp);
467 int err = 0;
468 int scheduled = 0;
469
470 for (; wr; wr = wr->next) {
471 err = qib_post_one_send(qp, wr, &scheduled);
472 if (err) {
473 *bad_wr = wr;
474 goto bail;
475 }
476 }
477
478 /* Try to do the send work in the caller's context. */
479 if (!scheduled)
480 qib_do_send(&qp->s_work);
481
482 bail:
483 return err;
484 }
485
486 /**
487 * qib_post_receive - post a receive on a QP
488 * @ibqp: the QP to post the receive on
489 * @wr: the WR to post
490 * @bad_wr: the first bad WR is put here
491 *
492 * This may be called from interrupt context.
493 */
494 static int qib_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
495 struct ib_recv_wr **bad_wr)
496 {
497 struct qib_qp *qp = to_iqp(ibqp);
498 struct qib_rwq *wq = qp->r_rq.wq;
499 unsigned long flags;
500 int ret;
501
502 /* Check that state is OK to post receive. */
503 if (!(ib_qib_state_ops[qp->state] & QIB_POST_RECV_OK) || !wq) {
504 *bad_wr = wr;
505 ret = -EINVAL;
506 goto bail;
507 }
508
509 for (; wr; wr = wr->next) {
510 struct qib_rwqe *wqe;
511 u32 next;
512 int i;
513
514 if ((unsigned) wr->num_sge > qp->r_rq.max_sge) {
515 *bad_wr = wr;
516 ret = -EINVAL;
517 goto bail;
518 }
519
520 spin_lock_irqsave(&qp->r_rq.lock, flags);
521 next = wq->head + 1;
522 if (next >= qp->r_rq.size)
523 next = 0;
524 if (next == wq->tail) {
525 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
526 *bad_wr = wr;
527 ret = -ENOMEM;
528 goto bail;
529 }
530
531 wqe = get_rwqe_ptr(&qp->r_rq, wq->head);
532 wqe->wr_id = wr->wr_id;
533 wqe->num_sge = wr->num_sge;
534 for (i = 0; i < wr->num_sge; i++)
535 wqe->sg_list[i] = wr->sg_list[i];
536 /* Make sure queue entry is written before the head index. */
537 smp_wmb();
538 wq->head = next;
539 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
540 }
541 ret = 0;
542
543 bail:
544 return ret;
545 }
546
547 /**
548 * qib_qp_rcv - processing an incoming packet on a QP
549 * @rcd: the context pointer
550 * @hdr: the packet header
551 * @has_grh: true if the packet has a GRH
552 * @data: the packet data
553 * @tlen: the packet length
554 * @qp: the QP the packet came on
555 *
556 * This is called from qib_ib_rcv() to process an incoming packet
557 * for the given QP.
558 * Called at interrupt level.
559 */
560 static void qib_qp_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr,
561 int has_grh, void *data, u32 tlen, struct qib_qp *qp)
562 {
563 struct qib_ibport *ibp = &rcd->ppd->ibport_data;
564
565 spin_lock(&qp->r_lock);
566
567 /* Check for valid receive state. */
568 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) {
569 ibp->n_pkt_drops++;
570 goto unlock;
571 }
572
573 switch (qp->ibqp.qp_type) {
574 case IB_QPT_SMI:
575 case IB_QPT_GSI:
576 if (ib_qib_disable_sma)
577 break;
578 /* FALLTHROUGH */
579 case IB_QPT_UD:
580 qib_ud_rcv(ibp, hdr, has_grh, data, tlen, qp);
581 break;
582
583 case IB_QPT_RC:
584 qib_rc_rcv(rcd, hdr, has_grh, data, tlen, qp);
585 break;
586
587 case IB_QPT_UC:
588 qib_uc_rcv(ibp, hdr, has_grh, data, tlen, qp);
589 break;
590
591 default:
592 break;
593 }
594
595 unlock:
596 spin_unlock(&qp->r_lock);
597 }
598
599 /**
600 * qib_ib_rcv - process an incoming packet
601 * @rcd: the context pointer
602 * @rhdr: the header of the packet
603 * @data: the packet payload
604 * @tlen: the packet length
605 *
606 * This is called from qib_kreceive() to process an incoming packet at
607 * interrupt level. Tlen is the length of the header + data + CRC in bytes.
608 */
609 void qib_ib_rcv(struct qib_ctxtdata *rcd, void *rhdr, void *data, u32 tlen)
610 {
611 struct qib_pportdata *ppd = rcd->ppd;
612 struct qib_ibport *ibp = &ppd->ibport_data;
613 struct qib_ib_header *hdr = rhdr;
614 struct qib_other_headers *ohdr;
615 struct qib_qp *qp;
616 u32 qp_num;
617 int lnh;
618 u8 opcode;
619 u16 lid;
620
621 /* 24 == LRH+BTH+CRC */
622 if (unlikely(tlen < 24))
623 goto drop;
624
625 /* Check for a valid destination LID (see ch. 7.11.1). */
626 lid = be16_to_cpu(hdr->lrh[1]);
627 if (lid < QIB_MULTICAST_LID_BASE) {
628 lid &= ~((1 << ppd->lmc) - 1);
629 if (unlikely(lid != ppd->lid))
630 goto drop;
631 }
632
633 /* Check for GRH */
634 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
635 if (lnh == QIB_LRH_BTH)
636 ohdr = &hdr->u.oth;
637 else if (lnh == QIB_LRH_GRH) {
638 u32 vtf;
639
640 ohdr = &hdr->u.l.oth;
641 if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
642 goto drop;
643 vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
644 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
645 goto drop;
646 } else
647 goto drop;
648
649 opcode = (be32_to_cpu(ohdr->bth[0]) >> 24) & 0x7f;
650 #ifdef CONFIG_DEBUG_FS
651 rcd->opstats->stats[opcode].n_bytes += tlen;
652 rcd->opstats->stats[opcode].n_packets++;
653 #endif
654
655 /* Get the destination QP number. */
656 qp_num = be32_to_cpu(ohdr->bth[1]) & QIB_QPN_MASK;
657 if (qp_num == QIB_MULTICAST_QPN) {
658 struct qib_mcast *mcast;
659 struct qib_mcast_qp *p;
660
661 if (lnh != QIB_LRH_GRH)
662 goto drop;
663 mcast = qib_mcast_find(ibp, &hdr->u.l.grh.dgid);
664 if (mcast == NULL)
665 goto drop;
666 this_cpu_inc(ibp->pmastats->n_multicast_rcv);
667 list_for_each_entry_rcu(p, &mcast->qp_list, list)
668 qib_qp_rcv(rcd, hdr, 1, data, tlen, p->qp);
669 /*
670 * Notify qib_multicast_detach() if it is waiting for us
671 * to finish.
672 */
673 if (atomic_dec_return(&mcast->refcount) <= 1)
674 wake_up(&mcast->wait);
675 } else {
676 if (rcd->lookaside_qp) {
677 if (rcd->lookaside_qpn != qp_num) {
678 if (atomic_dec_and_test(
679 &rcd->lookaside_qp->refcount))
680 wake_up(
681 &rcd->lookaside_qp->wait);
682 rcd->lookaside_qp = NULL;
683 }
684 }
685 if (!rcd->lookaside_qp) {
686 qp = qib_lookup_qpn(ibp, qp_num);
687 if (!qp)
688 goto drop;
689 rcd->lookaside_qp = qp;
690 rcd->lookaside_qpn = qp_num;
691 } else
692 qp = rcd->lookaside_qp;
693 this_cpu_inc(ibp->pmastats->n_unicast_rcv);
694 qib_qp_rcv(rcd, hdr, lnh == QIB_LRH_GRH, data, tlen, qp);
695 }
696 return;
697
698 drop:
699 ibp->n_pkt_drops++;
700 }
701
702 /*
703 * This is called from a timer to check for QPs
704 * which need kernel memory in order to send a packet.
705 */
706 static void mem_timer(unsigned long data)
707 {
708 struct qib_ibdev *dev = (struct qib_ibdev *) data;
709 struct list_head *list = &dev->memwait;
710 struct qib_qp *qp = NULL;
711 unsigned long flags;
712
713 spin_lock_irqsave(&dev->pending_lock, flags);
714 if (!list_empty(list)) {
715 qp = list_entry(list->next, struct qib_qp, iowait);
716 list_del_init(&qp->iowait);
717 atomic_inc(&qp->refcount);
718 if (!list_empty(list))
719 mod_timer(&dev->mem_timer, jiffies + 1);
720 }
721 spin_unlock_irqrestore(&dev->pending_lock, flags);
722
723 if (qp) {
724 spin_lock_irqsave(&qp->s_lock, flags);
725 if (qp->s_flags & QIB_S_WAIT_KMEM) {
726 qp->s_flags &= ~QIB_S_WAIT_KMEM;
727 qib_schedule_send(qp);
728 }
729 spin_unlock_irqrestore(&qp->s_lock, flags);
730 if (atomic_dec_and_test(&qp->refcount))
731 wake_up(&qp->wait);
732 }
733 }
734
735 static void update_sge(struct qib_sge_state *ss, u32 length)
736 {
737 struct qib_sge *sge = &ss->sge;
738
739 sge->vaddr += length;
740 sge->length -= length;
741 sge->sge_length -= length;
742 if (sge->sge_length == 0) {
743 if (--ss->num_sge)
744 *sge = *ss->sg_list++;
745 } else if (sge->length == 0 && sge->mr->lkey) {
746 if (++sge->n >= QIB_SEGSZ) {
747 if (++sge->m >= sge->mr->mapsz)
748 return;
749 sge->n = 0;
750 }
751 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
752 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
753 }
754 }
755
756 #ifdef __LITTLE_ENDIAN
757 static inline u32 get_upper_bits(u32 data, u32 shift)
758 {
759 return data >> shift;
760 }
761
762 static inline u32 set_upper_bits(u32 data, u32 shift)
763 {
764 return data << shift;
765 }
766
767 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
768 {
769 data <<= ((sizeof(u32) - n) * BITS_PER_BYTE);
770 data >>= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
771 return data;
772 }
773 #else
774 static inline u32 get_upper_bits(u32 data, u32 shift)
775 {
776 return data << shift;
777 }
778
779 static inline u32 set_upper_bits(u32 data, u32 shift)
780 {
781 return data >> shift;
782 }
783
784 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
785 {
786 data >>= ((sizeof(u32) - n) * BITS_PER_BYTE);
787 data <<= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
788 return data;
789 }
790 #endif
791
792 static void copy_io(u32 __iomem *piobuf, struct qib_sge_state *ss,
793 u32 length, unsigned flush_wc)
794 {
795 u32 extra = 0;
796 u32 data = 0;
797 u32 last;
798
799 while (1) {
800 u32 len = ss->sge.length;
801 u32 off;
802
803 if (len > length)
804 len = length;
805 if (len > ss->sge.sge_length)
806 len = ss->sge.sge_length;
807 BUG_ON(len == 0);
808 /* If the source address is not aligned, try to align it. */
809 off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
810 if (off) {
811 u32 *addr = (u32 *)((unsigned long)ss->sge.vaddr &
812 ~(sizeof(u32) - 1));
813 u32 v = get_upper_bits(*addr, off * BITS_PER_BYTE);
814 u32 y;
815
816 y = sizeof(u32) - off;
817 if (len > y)
818 len = y;
819 if (len + extra >= sizeof(u32)) {
820 data |= set_upper_bits(v, extra *
821 BITS_PER_BYTE);
822 len = sizeof(u32) - extra;
823 if (len == length) {
824 last = data;
825 break;
826 }
827 __raw_writel(data, piobuf);
828 piobuf++;
829 extra = 0;
830 data = 0;
831 } else {
832 /* Clear unused upper bytes */
833 data |= clear_upper_bytes(v, len, extra);
834 if (len == length) {
835 last = data;
836 break;
837 }
838 extra += len;
839 }
840 } else if (extra) {
841 /* Source address is aligned. */
842 u32 *addr = (u32 *) ss->sge.vaddr;
843 int shift = extra * BITS_PER_BYTE;
844 int ushift = 32 - shift;
845 u32 l = len;
846
847 while (l >= sizeof(u32)) {
848 u32 v = *addr;
849
850 data |= set_upper_bits(v, shift);
851 __raw_writel(data, piobuf);
852 data = get_upper_bits(v, ushift);
853 piobuf++;
854 addr++;
855 l -= sizeof(u32);
856 }
857 /*
858 * We still have 'extra' number of bytes leftover.
859 */
860 if (l) {
861 u32 v = *addr;
862
863 if (l + extra >= sizeof(u32)) {
864 data |= set_upper_bits(v, shift);
865 len -= l + extra - sizeof(u32);
866 if (len == length) {
867 last = data;
868 break;
869 }
870 __raw_writel(data, piobuf);
871 piobuf++;
872 extra = 0;
873 data = 0;
874 } else {
875 /* Clear unused upper bytes */
876 data |= clear_upper_bytes(v, l, extra);
877 if (len == length) {
878 last = data;
879 break;
880 }
881 extra += l;
882 }
883 } else if (len == length) {
884 last = data;
885 break;
886 }
887 } else if (len == length) {
888 u32 w;
889
890 /*
891 * Need to round up for the last dword in the
892 * packet.
893 */
894 w = (len + 3) >> 2;
895 qib_pio_copy(piobuf, ss->sge.vaddr, w - 1);
896 piobuf += w - 1;
897 last = ((u32 *) ss->sge.vaddr)[w - 1];
898 break;
899 } else {
900 u32 w = len >> 2;
901
902 qib_pio_copy(piobuf, ss->sge.vaddr, w);
903 piobuf += w;
904
905 extra = len & (sizeof(u32) - 1);
906 if (extra) {
907 u32 v = ((u32 *) ss->sge.vaddr)[w];
908
909 /* Clear unused upper bytes */
910 data = clear_upper_bytes(v, extra, 0);
911 }
912 }
913 update_sge(ss, len);
914 length -= len;
915 }
916 /* Update address before sending packet. */
917 update_sge(ss, length);
918 if (flush_wc) {
919 /* must flush early everything before trigger word */
920 qib_flush_wc();
921 __raw_writel(last, piobuf);
922 /* be sure trigger word is written */
923 qib_flush_wc();
924 } else
925 __raw_writel(last, piobuf);
926 }
927
928 static noinline struct qib_verbs_txreq *__get_txreq(struct qib_ibdev *dev,
929 struct qib_qp *qp)
930 {
931 struct qib_verbs_txreq *tx;
932 unsigned long flags;
933
934 spin_lock_irqsave(&qp->s_lock, flags);
935 spin_lock(&dev->pending_lock);
936
937 if (!list_empty(&dev->txreq_free)) {
938 struct list_head *l = dev->txreq_free.next;
939
940 list_del(l);
941 spin_unlock(&dev->pending_lock);
942 spin_unlock_irqrestore(&qp->s_lock, flags);
943 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
944 } else {
945 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK &&
946 list_empty(&qp->iowait)) {
947 dev->n_txwait++;
948 qp->s_flags |= QIB_S_WAIT_TX;
949 list_add_tail(&qp->iowait, &dev->txwait);
950 }
951 qp->s_flags &= ~QIB_S_BUSY;
952 spin_unlock(&dev->pending_lock);
953 spin_unlock_irqrestore(&qp->s_lock, flags);
954 tx = ERR_PTR(-EBUSY);
955 }
956 return tx;
957 }
958
959 static inline struct qib_verbs_txreq *get_txreq(struct qib_ibdev *dev,
960 struct qib_qp *qp)
961 {
962 struct qib_verbs_txreq *tx;
963 unsigned long flags;
964
965 spin_lock_irqsave(&dev->pending_lock, flags);
966 /* assume the list non empty */
967 if (likely(!list_empty(&dev->txreq_free))) {
968 struct list_head *l = dev->txreq_free.next;
969
970 list_del(l);
971 spin_unlock_irqrestore(&dev->pending_lock, flags);
972 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
973 } else {
974 /* call slow path to get the extra lock */
975 spin_unlock_irqrestore(&dev->pending_lock, flags);
976 tx = __get_txreq(dev, qp);
977 }
978 return tx;
979 }
980
981 void qib_put_txreq(struct qib_verbs_txreq *tx)
982 {
983 struct qib_ibdev *dev;
984 struct qib_qp *qp;
985 unsigned long flags;
986
987 qp = tx->qp;
988 dev = to_idev(qp->ibqp.device);
989
990 if (atomic_dec_and_test(&qp->refcount))
991 wake_up(&qp->wait);
992 if (tx->mr) {
993 qib_put_mr(tx->mr);
994 tx->mr = NULL;
995 }
996 if (tx->txreq.flags & QIB_SDMA_TXREQ_F_FREEBUF) {
997 tx->txreq.flags &= ~QIB_SDMA_TXREQ_F_FREEBUF;
998 dma_unmap_single(&dd_from_dev(dev)->pcidev->dev,
999 tx->txreq.addr, tx->hdr_dwords << 2,
1000 DMA_TO_DEVICE);
1001 kfree(tx->align_buf);
1002 }
1003
1004 spin_lock_irqsave(&dev->pending_lock, flags);
1005
1006 /* Put struct back on free list */
1007 list_add(&tx->txreq.list, &dev->txreq_free);
1008
1009 if (!list_empty(&dev->txwait)) {
1010 /* Wake up first QP wanting a free struct */
1011 qp = list_entry(dev->txwait.next, struct qib_qp, iowait);
1012 list_del_init(&qp->iowait);
1013 atomic_inc(&qp->refcount);
1014 spin_unlock_irqrestore(&dev->pending_lock, flags);
1015
1016 spin_lock_irqsave(&qp->s_lock, flags);
1017 if (qp->s_flags & QIB_S_WAIT_TX) {
1018 qp->s_flags &= ~QIB_S_WAIT_TX;
1019 qib_schedule_send(qp);
1020 }
1021 spin_unlock_irqrestore(&qp->s_lock, flags);
1022
1023 if (atomic_dec_and_test(&qp->refcount))
1024 wake_up(&qp->wait);
1025 } else
1026 spin_unlock_irqrestore(&dev->pending_lock, flags);
1027 }
1028
1029 /*
1030 * This is called when there are send DMA descriptors that might be
1031 * available.
1032 *
1033 * This is called with ppd->sdma_lock held.
1034 */
1035 void qib_verbs_sdma_desc_avail(struct qib_pportdata *ppd, unsigned avail)
1036 {
1037 struct qib_qp *qp, *nqp;
1038 struct qib_qp *qps[20];
1039 struct qib_ibdev *dev;
1040 unsigned i, n;
1041
1042 n = 0;
1043 dev = &ppd->dd->verbs_dev;
1044 spin_lock(&dev->pending_lock);
1045
1046 /* Search wait list for first QP wanting DMA descriptors. */
1047 list_for_each_entry_safe(qp, nqp, &dev->dmawait, iowait) {
1048 if (qp->port_num != ppd->port)
1049 continue;
1050 if (n == ARRAY_SIZE(qps))
1051 break;
1052 if (qp->s_tx->txreq.sg_count > avail)
1053 break;
1054 avail -= qp->s_tx->txreq.sg_count;
1055 list_del_init(&qp->iowait);
1056 atomic_inc(&qp->refcount);
1057 qps[n++] = qp;
1058 }
1059
1060 spin_unlock(&dev->pending_lock);
1061
1062 for (i = 0; i < n; i++) {
1063 qp = qps[i];
1064 spin_lock(&qp->s_lock);
1065 if (qp->s_flags & QIB_S_WAIT_DMA_DESC) {
1066 qp->s_flags &= ~QIB_S_WAIT_DMA_DESC;
1067 qib_schedule_send(qp);
1068 }
1069 spin_unlock(&qp->s_lock);
1070 if (atomic_dec_and_test(&qp->refcount))
1071 wake_up(&qp->wait);
1072 }
1073 }
1074
1075 /*
1076 * This is called with ppd->sdma_lock held.
1077 */
1078 static void sdma_complete(struct qib_sdma_txreq *cookie, int status)
1079 {
1080 struct qib_verbs_txreq *tx =
1081 container_of(cookie, struct qib_verbs_txreq, txreq);
1082 struct qib_qp *qp = tx->qp;
1083
1084 spin_lock(&qp->s_lock);
1085 if (tx->wqe)
1086 qib_send_complete(qp, tx->wqe, IB_WC_SUCCESS);
1087 else if (qp->ibqp.qp_type == IB_QPT_RC) {
1088 struct qib_ib_header *hdr;
1089
1090 if (tx->txreq.flags & QIB_SDMA_TXREQ_F_FREEBUF)
1091 hdr = &tx->align_buf->hdr;
1092 else {
1093 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1094
1095 hdr = &dev->pio_hdrs[tx->hdr_inx].hdr;
1096 }
1097 qib_rc_send_complete(qp, hdr);
1098 }
1099 if (atomic_dec_and_test(&qp->s_dma_busy)) {
1100 if (qp->state == IB_QPS_RESET)
1101 wake_up(&qp->wait_dma);
1102 else if (qp->s_flags & QIB_S_WAIT_DMA) {
1103 qp->s_flags &= ~QIB_S_WAIT_DMA;
1104 qib_schedule_send(qp);
1105 }
1106 }
1107 spin_unlock(&qp->s_lock);
1108
1109 qib_put_txreq(tx);
1110 }
1111
1112 static int wait_kmem(struct qib_ibdev *dev, struct qib_qp *qp)
1113 {
1114 unsigned long flags;
1115 int ret = 0;
1116
1117 spin_lock_irqsave(&qp->s_lock, flags);
1118 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) {
1119 spin_lock(&dev->pending_lock);
1120 if (list_empty(&qp->iowait)) {
1121 if (list_empty(&dev->memwait))
1122 mod_timer(&dev->mem_timer, jiffies + 1);
1123 qp->s_flags |= QIB_S_WAIT_KMEM;
1124 list_add_tail(&qp->iowait, &dev->memwait);
1125 }
1126 spin_unlock(&dev->pending_lock);
1127 qp->s_flags &= ~QIB_S_BUSY;
1128 ret = -EBUSY;
1129 }
1130 spin_unlock_irqrestore(&qp->s_lock, flags);
1131
1132 return ret;
1133 }
1134
1135 static int qib_verbs_send_dma(struct qib_qp *qp, struct qib_ib_header *hdr,
1136 u32 hdrwords, struct qib_sge_state *ss, u32 len,
1137 u32 plen, u32 dwords)
1138 {
1139 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1140 struct qib_devdata *dd = dd_from_dev(dev);
1141 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
1142 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1143 struct qib_verbs_txreq *tx;
1144 struct qib_pio_header *phdr;
1145 u32 control;
1146 u32 ndesc;
1147 int ret;
1148
1149 tx = qp->s_tx;
1150 if (tx) {
1151 qp->s_tx = NULL;
1152 /* resend previously constructed packet */
1153 ret = qib_sdma_verbs_send(ppd, tx->ss, tx->dwords, tx);
1154 goto bail;
1155 }
1156
1157 tx = get_txreq(dev, qp);
1158 if (IS_ERR(tx))
1159 goto bail_tx;
1160
1161 control = dd->f_setpbc_control(ppd, plen, qp->s_srate,
1162 be16_to_cpu(hdr->lrh[0]) >> 12);
1163 tx->qp = qp;
1164 atomic_inc(&qp->refcount);
1165 tx->wqe = qp->s_wqe;
1166 tx->mr = qp->s_rdma_mr;
1167 if (qp->s_rdma_mr)
1168 qp->s_rdma_mr = NULL;
1169 tx->txreq.callback = sdma_complete;
1170 if (dd->flags & QIB_HAS_SDMA_TIMEOUT)
1171 tx->txreq.flags = QIB_SDMA_TXREQ_F_HEADTOHOST;
1172 else
1173 tx->txreq.flags = QIB_SDMA_TXREQ_F_INTREQ;
1174 if (plen + 1 > dd->piosize2kmax_dwords)
1175 tx->txreq.flags |= QIB_SDMA_TXREQ_F_USELARGEBUF;
1176
1177 if (len) {
1178 /*
1179 * Don't try to DMA if it takes more descriptors than
1180 * the queue holds.
1181 */
1182 ndesc = qib_count_sge(ss, len);
1183 if (ndesc >= ppd->sdma_descq_cnt)
1184 ndesc = 0;
1185 } else
1186 ndesc = 1;
1187 if (ndesc) {
1188 phdr = &dev->pio_hdrs[tx->hdr_inx];
1189 phdr->pbc[0] = cpu_to_le32(plen);
1190 phdr->pbc[1] = cpu_to_le32(control);
1191 memcpy(&phdr->hdr, hdr, hdrwords << 2);
1192 tx->txreq.flags |= QIB_SDMA_TXREQ_F_FREEDESC;
1193 tx->txreq.sg_count = ndesc;
1194 tx->txreq.addr = dev->pio_hdrs_phys +
1195 tx->hdr_inx * sizeof(struct qib_pio_header);
1196 tx->hdr_dwords = hdrwords + 2; /* add PBC length */
1197 ret = qib_sdma_verbs_send(ppd, ss, dwords, tx);
1198 goto bail;
1199 }
1200
1201 /* Allocate a buffer and copy the header and payload to it. */
1202 tx->hdr_dwords = plen + 1;
1203 phdr = kmalloc(tx->hdr_dwords << 2, GFP_ATOMIC);
1204 if (!phdr)
1205 goto err_tx;
1206 phdr->pbc[0] = cpu_to_le32(plen);
1207 phdr->pbc[1] = cpu_to_le32(control);
1208 memcpy(&phdr->hdr, hdr, hdrwords << 2);
1209 qib_copy_from_sge((u32 *) &phdr->hdr + hdrwords, ss, len);
1210
1211 tx->txreq.addr = dma_map_single(&dd->pcidev->dev, phdr,
1212 tx->hdr_dwords << 2, DMA_TO_DEVICE);
1213 if (dma_mapping_error(&dd->pcidev->dev, tx->txreq.addr))
1214 goto map_err;
1215 tx->align_buf = phdr;
1216 tx->txreq.flags |= QIB_SDMA_TXREQ_F_FREEBUF;
1217 tx->txreq.sg_count = 1;
1218 ret = qib_sdma_verbs_send(ppd, NULL, 0, tx);
1219 goto unaligned;
1220
1221 map_err:
1222 kfree(phdr);
1223 err_tx:
1224 qib_put_txreq(tx);
1225 ret = wait_kmem(dev, qp);
1226 unaligned:
1227 ibp->n_unaligned++;
1228 bail:
1229 return ret;
1230 bail_tx:
1231 ret = PTR_ERR(tx);
1232 goto bail;
1233 }
1234
1235 /*
1236 * If we are now in the error state, return zero to flush the
1237 * send work request.
1238 */
1239 static int no_bufs_available(struct qib_qp *qp)
1240 {
1241 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
1242 struct qib_devdata *dd;
1243 unsigned long flags;
1244 int ret = 0;
1245
1246 /*
1247 * Note that as soon as want_buffer() is called and
1248 * possibly before it returns, qib_ib_piobufavail()
1249 * could be called. Therefore, put QP on the I/O wait list before
1250 * enabling the PIO avail interrupt.
1251 */
1252 spin_lock_irqsave(&qp->s_lock, flags);
1253 if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) {
1254 spin_lock(&dev->pending_lock);
1255 if (list_empty(&qp->iowait)) {
1256 dev->n_piowait++;
1257 qp->s_flags |= QIB_S_WAIT_PIO;
1258 list_add_tail(&qp->iowait, &dev->piowait);
1259 dd = dd_from_dev(dev);
1260 dd->f_wantpiobuf_intr(dd, 1);
1261 }
1262 spin_unlock(&dev->pending_lock);
1263 qp->s_flags &= ~QIB_S_BUSY;
1264 ret = -EBUSY;
1265 }
1266 spin_unlock_irqrestore(&qp->s_lock, flags);
1267 return ret;
1268 }
1269
1270 static int qib_verbs_send_pio(struct qib_qp *qp, struct qib_ib_header *ibhdr,
1271 u32 hdrwords, struct qib_sge_state *ss, u32 len,
1272 u32 plen, u32 dwords)
1273 {
1274 struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
1275 struct qib_pportdata *ppd = dd->pport + qp->port_num - 1;
1276 u32 *hdr = (u32 *) ibhdr;
1277 u32 __iomem *piobuf_orig;
1278 u32 __iomem *piobuf;
1279 u64 pbc;
1280 unsigned long flags;
1281 unsigned flush_wc;
1282 u32 control;
1283 u32 pbufn;
1284
1285 control = dd->f_setpbc_control(ppd, plen, qp->s_srate,
1286 be16_to_cpu(ibhdr->lrh[0]) >> 12);
1287 pbc = ((u64) control << 32) | plen;
1288 piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn);
1289 if (unlikely(piobuf == NULL))
1290 return no_bufs_available(qp);
1291
1292 /*
1293 * Write the pbc.
1294 * We have to flush after the PBC for correctness on some cpus
1295 * or WC buffer can be written out of order.
1296 */
1297 writeq(pbc, piobuf);
1298 piobuf_orig = piobuf;
1299 piobuf += 2;
1300
1301 flush_wc = dd->flags & QIB_PIO_FLUSH_WC;
1302 if (len == 0) {
1303 /*
1304 * If there is just the header portion, must flush before
1305 * writing last word of header for correctness, and after
1306 * the last header word (trigger word).
1307 */
1308 if (flush_wc) {
1309 qib_flush_wc();
1310 qib_pio_copy(piobuf, hdr, hdrwords - 1);
1311 qib_flush_wc();
1312 __raw_writel(hdr[hdrwords - 1], piobuf + hdrwords - 1);
1313 qib_flush_wc();
1314 } else
1315 qib_pio_copy(piobuf, hdr, hdrwords);
1316 goto done;
1317 }
1318
1319 if (flush_wc)
1320 qib_flush_wc();
1321 qib_pio_copy(piobuf, hdr, hdrwords);
1322 piobuf += hdrwords;
1323
1324 /* The common case is aligned and contained in one segment. */
1325 if (likely(ss->num_sge == 1 && len <= ss->sge.length &&
1326 !((unsigned long)ss->sge.vaddr & (sizeof(u32) - 1)))) {
1327 u32 *addr = (u32 *) ss->sge.vaddr;
1328
1329 /* Update address before sending packet. */
1330 update_sge(ss, len);
1331 if (flush_wc) {
1332 qib_pio_copy(piobuf, addr, dwords - 1);
1333 /* must flush early everything before trigger word */
1334 qib_flush_wc();
1335 __raw_writel(addr[dwords - 1], piobuf + dwords - 1);
1336 /* be sure trigger word is written */
1337 qib_flush_wc();
1338 } else
1339 qib_pio_copy(piobuf, addr, dwords);
1340 goto done;
1341 }
1342 copy_io(piobuf, ss, len, flush_wc);
1343 done:
1344 if (dd->flags & QIB_USE_SPCL_TRIG) {
1345 u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023;
1346
1347 qib_flush_wc();
1348 __raw_writel(0xaebecede, piobuf_orig + spcl_off);
1349 }
1350 qib_sendbuf_done(dd, pbufn);
1351 if (qp->s_rdma_mr) {
1352 qib_put_mr(qp->s_rdma_mr);
1353 qp->s_rdma_mr = NULL;
1354 }
1355 if (qp->s_wqe) {
1356 spin_lock_irqsave(&qp->s_lock, flags);
1357 qib_send_complete(qp, qp->s_wqe, IB_WC_SUCCESS);
1358 spin_unlock_irqrestore(&qp->s_lock, flags);
1359 } else if (qp->ibqp.qp_type == IB_QPT_RC) {
1360 spin_lock_irqsave(&qp->s_lock, flags);
1361 qib_rc_send_complete(qp, ibhdr);
1362 spin_unlock_irqrestore(&qp->s_lock, flags);
1363 }
1364 return 0;
1365 }
1366
1367 /**
1368 * qib_verbs_send - send a packet
1369 * @qp: the QP to send on
1370 * @hdr: the packet header
1371 * @hdrwords: the number of 32-bit words in the header
1372 * @ss: the SGE to send
1373 * @len: the length of the packet in bytes
1374 *
1375 * Return zero if packet is sent or queued OK.
1376 * Return non-zero and clear qp->s_flags QIB_S_BUSY otherwise.
1377 */
1378 int qib_verbs_send(struct qib_qp *qp, struct qib_ib_header *hdr,
1379 u32 hdrwords, struct qib_sge_state *ss, u32 len)
1380 {
1381 struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device);
1382 u32 plen;
1383 int ret;
1384 u32 dwords = (len + 3) >> 2;
1385
1386 /*
1387 * Calculate the send buffer trigger address.
1388 * The +1 counts for the pbc control dword following the pbc length.
1389 */
1390 plen = hdrwords + dwords + 1;
1391
1392 /*
1393 * VL15 packets (IB_QPT_SMI) will always use PIO, so we
1394 * can defer SDMA restart until link goes ACTIVE without
1395 * worrying about just how we got there.
1396 */
1397 if (qp->ibqp.qp_type == IB_QPT_SMI ||
1398 !(dd->flags & QIB_HAS_SEND_DMA))
1399 ret = qib_verbs_send_pio(qp, hdr, hdrwords, ss, len,
1400 plen, dwords);
1401 else
1402 ret = qib_verbs_send_dma(qp, hdr, hdrwords, ss, len,
1403 plen, dwords);
1404
1405 return ret;
1406 }
1407
1408 int qib_snapshot_counters(struct qib_pportdata *ppd, u64 *swords,
1409 u64 *rwords, u64 *spkts, u64 *rpkts,
1410 u64 *xmit_wait)
1411 {
1412 int ret;
1413 struct qib_devdata *dd = ppd->dd;
1414
1415 if (!(dd->flags & QIB_PRESENT)) {
1416 /* no hardware, freeze, etc. */
1417 ret = -EINVAL;
1418 goto bail;
1419 }
1420 *swords = dd->f_portcntr(ppd, QIBPORTCNTR_WORDSEND);
1421 *rwords = dd->f_portcntr(ppd, QIBPORTCNTR_WORDRCV);
1422 *spkts = dd->f_portcntr(ppd, QIBPORTCNTR_PKTSEND);
1423 *rpkts = dd->f_portcntr(ppd, QIBPORTCNTR_PKTRCV);
1424 *xmit_wait = dd->f_portcntr(ppd, QIBPORTCNTR_SENDSTALL);
1425
1426 ret = 0;
1427
1428 bail:
1429 return ret;
1430 }
1431
1432 /**
1433 * qib_get_counters - get various chip counters
1434 * @dd: the qlogic_ib device
1435 * @cntrs: counters are placed here
1436 *
1437 * Return the counters needed by recv_pma_get_portcounters().
1438 */
1439 int qib_get_counters(struct qib_pportdata *ppd,
1440 struct qib_verbs_counters *cntrs)
1441 {
1442 int ret;
1443
1444 if (!(ppd->dd->flags & QIB_PRESENT)) {
1445 /* no hardware, freeze, etc. */
1446 ret = -EINVAL;
1447 goto bail;
1448 }
1449 cntrs->symbol_error_counter =
1450 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBSYMBOLERR);
1451 cntrs->link_error_recovery_counter =
1452 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBLINKERRRECOV);
1453 /*
1454 * The link downed counter counts when the other side downs the
1455 * connection. We add in the number of times we downed the link
1456 * due to local link integrity errors to compensate.
1457 */
1458 cntrs->link_downed_counter =
1459 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBLINKDOWN);
1460 cntrs->port_rcv_errors =
1461 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXDROPPKT) +
1462 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RCVOVFL) +
1463 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERR_RLEN) +
1464 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_INVALIDRLEN) +
1465 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRLINK) +
1466 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRICRC) +
1467 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRVCRC) +
1468 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_ERRLPCRC) +
1469 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_BADFORMAT);
1470 cntrs->port_rcv_errors +=
1471 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXLOCALPHYERR);
1472 cntrs->port_rcv_errors +=
1473 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RXVLERR);
1474 cntrs->port_rcv_remphys_errors =
1475 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_RCVEBP);
1476 cntrs->port_xmit_discards =
1477 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_UNSUPVL);
1478 cntrs->port_xmit_data = ppd->dd->f_portcntr(ppd,
1479 QIBPORTCNTR_WORDSEND);
1480 cntrs->port_rcv_data = ppd->dd->f_portcntr(ppd,
1481 QIBPORTCNTR_WORDRCV);
1482 cntrs->port_xmit_packets = ppd->dd->f_portcntr(ppd,
1483 QIBPORTCNTR_PKTSEND);
1484 cntrs->port_rcv_packets = ppd->dd->f_portcntr(ppd,
1485 QIBPORTCNTR_PKTRCV);
1486 cntrs->local_link_integrity_errors =
1487 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_LLI);
1488 cntrs->excessive_buffer_overrun_errors =
1489 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_EXCESSBUFOVFL);
1490 cntrs->vl15_dropped =
1491 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_VL15PKTDROP);
1492
1493 ret = 0;
1494
1495 bail:
1496 return ret;
1497 }
1498
1499 /**
1500 * qib_ib_piobufavail - callback when a PIO buffer is available
1501 * @dd: the device pointer
1502 *
1503 * This is called from qib_intr() at interrupt level when a PIO buffer is
1504 * available after qib_verbs_send() returned an error that no buffers were
1505 * available. Disable the interrupt if there are no more QPs waiting.
1506 */
1507 void qib_ib_piobufavail(struct qib_devdata *dd)
1508 {
1509 struct qib_ibdev *dev = &dd->verbs_dev;
1510 struct list_head *list;
1511 struct qib_qp *qps[5];
1512 struct qib_qp *qp;
1513 unsigned long flags;
1514 unsigned i, n;
1515
1516 list = &dev->piowait;
1517 n = 0;
1518
1519 /*
1520 * Note: checking that the piowait list is empty and clearing
1521 * the buffer available interrupt needs to be atomic or we
1522 * could end up with QPs on the wait list with the interrupt
1523 * disabled.
1524 */
1525 spin_lock_irqsave(&dev->pending_lock, flags);
1526 while (!list_empty(list)) {
1527 if (n == ARRAY_SIZE(qps))
1528 goto full;
1529 qp = list_entry(list->next, struct qib_qp, iowait);
1530 list_del_init(&qp->iowait);
1531 atomic_inc(&qp->refcount);
1532 qps[n++] = qp;
1533 }
1534 dd->f_wantpiobuf_intr(dd, 0);
1535 full:
1536 spin_unlock_irqrestore(&dev->pending_lock, flags);
1537
1538 for (i = 0; i < n; i++) {
1539 qp = qps[i];
1540
1541 spin_lock_irqsave(&qp->s_lock, flags);
1542 if (qp->s_flags & QIB_S_WAIT_PIO) {
1543 qp->s_flags &= ~QIB_S_WAIT_PIO;
1544 qib_schedule_send(qp);
1545 }
1546 spin_unlock_irqrestore(&qp->s_lock, flags);
1547
1548 /* Notify qib_destroy_qp() if it is waiting. */
1549 if (atomic_dec_and_test(&qp->refcount))
1550 wake_up(&qp->wait);
1551 }
1552 }
1553
1554 static int qib_query_device(struct ib_device *ibdev, struct ib_device_attr *props,
1555 struct ib_udata *uhw)
1556 {
1557 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1558 struct qib_ibdev *dev = to_idev(ibdev);
1559
1560 if (uhw->inlen || uhw->outlen)
1561 return -EINVAL;
1562 memset(props, 0, sizeof(*props));
1563
1564 props->device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
1565 IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
1566 IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_RC_RNR_NAK_GEN |
1567 IB_DEVICE_PORT_ACTIVE_EVENT | IB_DEVICE_SRQ_RESIZE;
1568 props->page_size_cap = PAGE_SIZE;
1569 props->vendor_id =
1570 QIB_SRC_OUI_1 << 16 | QIB_SRC_OUI_2 << 8 | QIB_SRC_OUI_3;
1571 props->vendor_part_id = dd->deviceid;
1572 props->hw_ver = dd->minrev;
1573 props->sys_image_guid = ib_qib_sys_image_guid;
1574 props->max_mr_size = ~0ULL;
1575 props->max_qp = ib_qib_max_qps;
1576 props->max_qp_wr = ib_qib_max_qp_wrs;
1577 props->max_sge = ib_qib_max_sges;
1578 props->max_sge_rd = ib_qib_max_sges;
1579 props->max_cq = ib_qib_max_cqs;
1580 props->max_ah = ib_qib_max_ahs;
1581 props->max_cqe = ib_qib_max_cqes;
1582 props->max_mr = dev->lk_table.max;
1583 props->max_fmr = dev->lk_table.max;
1584 props->max_map_per_fmr = 32767;
1585 props->max_pd = ib_qib_max_pds;
1586 props->max_qp_rd_atom = QIB_MAX_RDMA_ATOMIC;
1587 props->max_qp_init_rd_atom = 255;
1588 /* props->max_res_rd_atom */
1589 props->max_srq = ib_qib_max_srqs;
1590 props->max_srq_wr = ib_qib_max_srq_wrs;
1591 props->max_srq_sge = ib_qib_max_srq_sges;
1592 /* props->local_ca_ack_delay */
1593 props->atomic_cap = IB_ATOMIC_GLOB;
1594 props->max_pkeys = qib_get_npkeys(dd);
1595 props->max_mcast_grp = ib_qib_max_mcast_grps;
1596 props->max_mcast_qp_attach = ib_qib_max_mcast_qp_attached;
1597 props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
1598 props->max_mcast_grp;
1599
1600 return 0;
1601 }
1602
1603 static int qib_query_port(struct ib_device *ibdev, u8 port,
1604 struct ib_port_attr *props)
1605 {
1606 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1607 struct qib_ibport *ibp = to_iport(ibdev, port);
1608 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1609 enum ib_mtu mtu;
1610 u16 lid = ppd->lid;
1611
1612 memset(props, 0, sizeof(*props));
1613 props->lid = lid ? lid : be16_to_cpu(IB_LID_PERMISSIVE);
1614 props->lmc = ppd->lmc;
1615 props->sm_lid = ibp->sm_lid;
1616 props->sm_sl = ibp->sm_sl;
1617 props->state = dd->f_iblink_state(ppd->lastibcstat);
1618 props->phys_state = dd->f_ibphys_portstate(ppd->lastibcstat);
1619 props->port_cap_flags = ibp->port_cap_flags;
1620 props->gid_tbl_len = QIB_GUIDS_PER_PORT;
1621 props->max_msg_sz = 0x80000000;
1622 props->pkey_tbl_len = qib_get_npkeys(dd);
1623 props->bad_pkey_cntr = ibp->pkey_violations;
1624 props->qkey_viol_cntr = ibp->qkey_violations;
1625 props->active_width = ppd->link_width_active;
1626 /* See rate_show() */
1627 props->active_speed = ppd->link_speed_active;
1628 props->max_vl_num = qib_num_vls(ppd->vls_supported);
1629 props->init_type_reply = 0;
1630
1631 props->max_mtu = qib_ibmtu ? qib_ibmtu : IB_MTU_4096;
1632 switch (ppd->ibmtu) {
1633 case 4096:
1634 mtu = IB_MTU_4096;
1635 break;
1636 case 2048:
1637 mtu = IB_MTU_2048;
1638 break;
1639 case 1024:
1640 mtu = IB_MTU_1024;
1641 break;
1642 case 512:
1643 mtu = IB_MTU_512;
1644 break;
1645 case 256:
1646 mtu = IB_MTU_256;
1647 break;
1648 default:
1649 mtu = IB_MTU_2048;
1650 }
1651 props->active_mtu = mtu;
1652 props->subnet_timeout = ibp->subnet_timeout;
1653
1654 return 0;
1655 }
1656
1657 static int qib_modify_device(struct ib_device *device,
1658 int device_modify_mask,
1659 struct ib_device_modify *device_modify)
1660 {
1661 struct qib_devdata *dd = dd_from_ibdev(device);
1662 unsigned i;
1663 int ret;
1664
1665 if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
1666 IB_DEVICE_MODIFY_NODE_DESC)) {
1667 ret = -EOPNOTSUPP;
1668 goto bail;
1669 }
1670
1671 if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC) {
1672 memcpy(device->node_desc, device_modify->node_desc, 64);
1673 for (i = 0; i < dd->num_pports; i++) {
1674 struct qib_ibport *ibp = &dd->pport[i].ibport_data;
1675
1676 qib_node_desc_chg(ibp);
1677 }
1678 }
1679
1680 if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) {
1681 ib_qib_sys_image_guid =
1682 cpu_to_be64(device_modify->sys_image_guid);
1683 for (i = 0; i < dd->num_pports; i++) {
1684 struct qib_ibport *ibp = &dd->pport[i].ibport_data;
1685
1686 qib_sys_guid_chg(ibp);
1687 }
1688 }
1689
1690 ret = 0;
1691
1692 bail:
1693 return ret;
1694 }
1695
1696 static int qib_modify_port(struct ib_device *ibdev, u8 port,
1697 int port_modify_mask, struct ib_port_modify *props)
1698 {
1699 struct qib_ibport *ibp = to_iport(ibdev, port);
1700 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1701
1702 ibp->port_cap_flags |= props->set_port_cap_mask;
1703 ibp->port_cap_flags &= ~props->clr_port_cap_mask;
1704 if (props->set_port_cap_mask || props->clr_port_cap_mask)
1705 qib_cap_mask_chg(ibp);
1706 if (port_modify_mask & IB_PORT_SHUTDOWN)
1707 qib_set_linkstate(ppd, QIB_IB_LINKDOWN);
1708 if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
1709 ibp->qkey_violations = 0;
1710 return 0;
1711 }
1712
1713 static int qib_query_gid(struct ib_device *ibdev, u8 port,
1714 int index, union ib_gid *gid)
1715 {
1716 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1717 int ret = 0;
1718
1719 if (!port || port > dd->num_pports)
1720 ret = -EINVAL;
1721 else {
1722 struct qib_ibport *ibp = to_iport(ibdev, port);
1723 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1724
1725 gid->global.subnet_prefix = ibp->gid_prefix;
1726 if (index == 0)
1727 gid->global.interface_id = ppd->guid;
1728 else if (index < QIB_GUIDS_PER_PORT)
1729 gid->global.interface_id = ibp->guids[index - 1];
1730 else
1731 ret = -EINVAL;
1732 }
1733
1734 return ret;
1735 }
1736
1737 static struct ib_pd *qib_alloc_pd(struct ib_device *ibdev,
1738 struct ib_ucontext *context,
1739 struct ib_udata *udata)
1740 {
1741 struct qib_ibdev *dev = to_idev(ibdev);
1742 struct qib_pd *pd;
1743 struct ib_pd *ret;
1744
1745 /*
1746 * This is actually totally arbitrary. Some correctness tests
1747 * assume there's a maximum number of PDs that can be allocated.
1748 * We don't actually have this limit, but we fail the test if
1749 * we allow allocations of more than we report for this value.
1750 */
1751
1752 pd = kmalloc(sizeof(*pd), GFP_KERNEL);
1753 if (!pd) {
1754 ret = ERR_PTR(-ENOMEM);
1755 goto bail;
1756 }
1757
1758 spin_lock(&dev->n_pds_lock);
1759 if (dev->n_pds_allocated == ib_qib_max_pds) {
1760 spin_unlock(&dev->n_pds_lock);
1761 kfree(pd);
1762 ret = ERR_PTR(-ENOMEM);
1763 goto bail;
1764 }
1765
1766 dev->n_pds_allocated++;
1767 spin_unlock(&dev->n_pds_lock);
1768
1769 /* ib_alloc_pd() will initialize pd->ibpd. */
1770 pd->user = udata != NULL;
1771
1772 ret = &pd->ibpd;
1773
1774 bail:
1775 return ret;
1776 }
1777
1778 static int qib_dealloc_pd(struct ib_pd *ibpd)
1779 {
1780 struct qib_pd *pd = to_ipd(ibpd);
1781 struct qib_ibdev *dev = to_idev(ibpd->device);
1782
1783 spin_lock(&dev->n_pds_lock);
1784 dev->n_pds_allocated--;
1785 spin_unlock(&dev->n_pds_lock);
1786
1787 kfree(pd);
1788
1789 return 0;
1790 }
1791
1792 int qib_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr)
1793 {
1794 /* A multicast address requires a GRH (see ch. 8.4.1). */
1795 if (ah_attr->dlid >= QIB_MULTICAST_LID_BASE &&
1796 ah_attr->dlid != QIB_PERMISSIVE_LID &&
1797 !(ah_attr->ah_flags & IB_AH_GRH))
1798 goto bail;
1799 if ((ah_attr->ah_flags & IB_AH_GRH) &&
1800 ah_attr->grh.sgid_index >= QIB_GUIDS_PER_PORT)
1801 goto bail;
1802 if (ah_attr->dlid == 0)
1803 goto bail;
1804 if (ah_attr->port_num < 1 ||
1805 ah_attr->port_num > ibdev->phys_port_cnt)
1806 goto bail;
1807 if (ah_attr->static_rate != IB_RATE_PORT_CURRENT &&
1808 ib_rate_to_mult(ah_attr->static_rate) < 0)
1809 goto bail;
1810 if (ah_attr->sl > 15)
1811 goto bail;
1812 return 0;
1813 bail:
1814 return -EINVAL;
1815 }
1816
1817 /**
1818 * qib_create_ah - create an address handle
1819 * @pd: the protection domain
1820 * @ah_attr: the attributes of the AH
1821 *
1822 * This may be called from interrupt context.
1823 */
1824 static struct ib_ah *qib_create_ah(struct ib_pd *pd,
1825 struct ib_ah_attr *ah_attr)
1826 {
1827 struct qib_ah *ah;
1828 struct ib_ah *ret;
1829 struct qib_ibdev *dev = to_idev(pd->device);
1830 unsigned long flags;
1831
1832 if (qib_check_ah(pd->device, ah_attr)) {
1833 ret = ERR_PTR(-EINVAL);
1834 goto bail;
1835 }
1836
1837 ah = kmalloc(sizeof(*ah), GFP_ATOMIC);
1838 if (!ah) {
1839 ret = ERR_PTR(-ENOMEM);
1840 goto bail;
1841 }
1842
1843 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1844 if (dev->n_ahs_allocated == ib_qib_max_ahs) {
1845 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1846 kfree(ah);
1847 ret = ERR_PTR(-ENOMEM);
1848 goto bail;
1849 }
1850
1851 dev->n_ahs_allocated++;
1852 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1853
1854 /* ib_create_ah() will initialize ah->ibah. */
1855 ah->attr = *ah_attr;
1856 atomic_set(&ah->refcount, 0);
1857
1858 ret = &ah->ibah;
1859
1860 bail:
1861 return ret;
1862 }
1863
1864 struct ib_ah *qib_create_qp0_ah(struct qib_ibport *ibp, u16 dlid)
1865 {
1866 struct ib_ah_attr attr;
1867 struct ib_ah *ah = ERR_PTR(-EINVAL);
1868 struct qib_qp *qp0;
1869
1870 memset(&attr, 0, sizeof(attr));
1871 attr.dlid = dlid;
1872 attr.port_num = ppd_from_ibp(ibp)->port;
1873 rcu_read_lock();
1874 qp0 = rcu_dereference(ibp->qp0);
1875 if (qp0)
1876 ah = ib_create_ah(qp0->ibqp.pd, &attr);
1877 rcu_read_unlock();
1878 return ah;
1879 }
1880
1881 /**
1882 * qib_destroy_ah - destroy an address handle
1883 * @ibah: the AH to destroy
1884 *
1885 * This may be called from interrupt context.
1886 */
1887 static int qib_destroy_ah(struct ib_ah *ibah)
1888 {
1889 struct qib_ibdev *dev = to_idev(ibah->device);
1890 struct qib_ah *ah = to_iah(ibah);
1891 unsigned long flags;
1892
1893 if (atomic_read(&ah->refcount) != 0)
1894 return -EBUSY;
1895
1896 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1897 dev->n_ahs_allocated--;
1898 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1899
1900 kfree(ah);
1901
1902 return 0;
1903 }
1904
1905 static int qib_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1906 {
1907 struct qib_ah *ah = to_iah(ibah);
1908
1909 if (qib_check_ah(ibah->device, ah_attr))
1910 return -EINVAL;
1911
1912 ah->attr = *ah_attr;
1913
1914 return 0;
1915 }
1916
1917 static int qib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1918 {
1919 struct qib_ah *ah = to_iah(ibah);
1920
1921 *ah_attr = ah->attr;
1922
1923 return 0;
1924 }
1925
1926 /**
1927 * qib_get_npkeys - return the size of the PKEY table for context 0
1928 * @dd: the qlogic_ib device
1929 */
1930 unsigned qib_get_npkeys(struct qib_devdata *dd)
1931 {
1932 return ARRAY_SIZE(dd->rcd[0]->pkeys);
1933 }
1934
1935 /*
1936 * Return the indexed PKEY from the port PKEY table.
1937 * No need to validate rcd[ctxt]; the port is setup if we are here.
1938 */
1939 unsigned qib_get_pkey(struct qib_ibport *ibp, unsigned index)
1940 {
1941 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
1942 struct qib_devdata *dd = ppd->dd;
1943 unsigned ctxt = ppd->hw_pidx;
1944 unsigned ret;
1945
1946 /* dd->rcd null if mini_init or some init failures */
1947 if (!dd->rcd || index >= ARRAY_SIZE(dd->rcd[ctxt]->pkeys))
1948 ret = 0;
1949 else
1950 ret = dd->rcd[ctxt]->pkeys[index];
1951
1952 return ret;
1953 }
1954
1955 static int qib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
1956 u16 *pkey)
1957 {
1958 struct qib_devdata *dd = dd_from_ibdev(ibdev);
1959 int ret;
1960
1961 if (index >= qib_get_npkeys(dd)) {
1962 ret = -EINVAL;
1963 goto bail;
1964 }
1965
1966 *pkey = qib_get_pkey(to_iport(ibdev, port), index);
1967 ret = 0;
1968
1969 bail:
1970 return ret;
1971 }
1972
1973 /**
1974 * qib_alloc_ucontext - allocate a ucontest
1975 * @ibdev: the infiniband device
1976 * @udata: not used by the QLogic_IB driver
1977 */
1978
1979 static struct ib_ucontext *qib_alloc_ucontext(struct ib_device *ibdev,
1980 struct ib_udata *udata)
1981 {
1982 struct qib_ucontext *context;
1983 struct ib_ucontext *ret;
1984
1985 context = kmalloc(sizeof(*context), GFP_KERNEL);
1986 if (!context) {
1987 ret = ERR_PTR(-ENOMEM);
1988 goto bail;
1989 }
1990
1991 ret = &context->ibucontext;
1992
1993 bail:
1994 return ret;
1995 }
1996
1997 static int qib_dealloc_ucontext(struct ib_ucontext *context)
1998 {
1999 kfree(to_iucontext(context));
2000 return 0;
2001 }
2002
2003 static void init_ibport(struct qib_pportdata *ppd)
2004 {
2005 struct qib_verbs_counters cntrs;
2006 struct qib_ibport *ibp = &ppd->ibport_data;
2007
2008 spin_lock_init(&ibp->lock);
2009 /* Set the prefix to the default value (see ch. 4.1.1) */
2010 ibp->gid_prefix = IB_DEFAULT_GID_PREFIX;
2011 ibp->sm_lid = be16_to_cpu(IB_LID_PERMISSIVE);
2012 ibp->port_cap_flags = IB_PORT_SYS_IMAGE_GUID_SUP |
2013 IB_PORT_CLIENT_REG_SUP | IB_PORT_SL_MAP_SUP |
2014 IB_PORT_TRAP_SUP | IB_PORT_AUTO_MIGR_SUP |
2015 IB_PORT_DR_NOTICE_SUP | IB_PORT_CAP_MASK_NOTICE_SUP |
2016 IB_PORT_OTHER_LOCAL_CHANGES_SUP;
2017 if (ppd->dd->flags & QIB_HAS_LINK_LATENCY)
2018 ibp->port_cap_flags |= IB_PORT_LINK_LATENCY_SUP;
2019 ibp->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
2020 ibp->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
2021 ibp->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
2022 ibp->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
2023 ibp->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
2024
2025 /* Snapshot current HW counters to "clear" them. */
2026 qib_get_counters(ppd, &cntrs);
2027 ibp->z_symbol_error_counter = cntrs.symbol_error_counter;
2028 ibp->z_link_error_recovery_counter =
2029 cntrs.link_error_recovery_counter;
2030 ibp->z_link_downed_counter = cntrs.link_downed_counter;
2031 ibp->z_port_rcv_errors = cntrs.port_rcv_errors;
2032 ibp->z_port_rcv_remphys_errors = cntrs.port_rcv_remphys_errors;
2033 ibp->z_port_xmit_discards = cntrs.port_xmit_discards;
2034 ibp->z_port_xmit_data = cntrs.port_xmit_data;
2035 ibp->z_port_rcv_data = cntrs.port_rcv_data;
2036 ibp->z_port_xmit_packets = cntrs.port_xmit_packets;
2037 ibp->z_port_rcv_packets = cntrs.port_rcv_packets;
2038 ibp->z_local_link_integrity_errors =
2039 cntrs.local_link_integrity_errors;
2040 ibp->z_excessive_buffer_overrun_errors =
2041 cntrs.excessive_buffer_overrun_errors;
2042 ibp->z_vl15_dropped = cntrs.vl15_dropped;
2043 RCU_INIT_POINTER(ibp->qp0, NULL);
2044 RCU_INIT_POINTER(ibp->qp1, NULL);
2045 }
2046
2047 static int qib_port_immutable(struct ib_device *ibdev, u8 port_num,
2048 struct ib_port_immutable *immutable)
2049 {
2050 struct ib_port_attr attr;
2051 int err;
2052
2053 err = qib_query_port(ibdev, port_num, &attr);
2054 if (err)
2055 return err;
2056
2057 immutable->pkey_tbl_len = attr.pkey_tbl_len;
2058 immutable->gid_tbl_len = attr.gid_tbl_len;
2059 immutable->core_cap_flags = RDMA_CORE_PORT_IBA_IB;
2060 immutable->max_mad_size = IB_MGMT_MAD_SIZE;
2061
2062 return 0;
2063 }
2064
2065 /**
2066 * qib_register_ib_device - register our device with the infiniband core
2067 * @dd: the device data structure
2068 * Return the allocated qib_ibdev pointer or NULL on error.
2069 */
2070 int qib_register_ib_device(struct qib_devdata *dd)
2071 {
2072 struct qib_ibdev *dev = &dd->verbs_dev;
2073 struct ib_device *ibdev = &dev->ibdev;
2074 struct qib_pportdata *ppd = dd->pport;
2075 unsigned i, lk_tab_size;
2076 int ret;
2077
2078 dev->qp_table_size = ib_qib_qp_table_size;
2079 get_random_bytes(&dev->qp_rnd, sizeof(dev->qp_rnd));
2080 dev->qp_table = kmalloc_array(
2081 dev->qp_table_size,
2082 sizeof(*dev->qp_table),
2083 GFP_KERNEL);
2084 if (!dev->qp_table) {
2085 ret = -ENOMEM;
2086 goto err_qpt;
2087 }
2088 for (i = 0; i < dev->qp_table_size; i++)
2089 RCU_INIT_POINTER(dev->qp_table[i], NULL);
2090
2091 for (i = 0; i < dd->num_pports; i++)
2092 init_ibport(ppd + i);
2093
2094 /* Only need to initialize non-zero fields. */
2095 spin_lock_init(&dev->qpt_lock);
2096 spin_lock_init(&dev->n_pds_lock);
2097 spin_lock_init(&dev->n_ahs_lock);
2098 spin_lock_init(&dev->n_cqs_lock);
2099 spin_lock_init(&dev->n_qps_lock);
2100 spin_lock_init(&dev->n_srqs_lock);
2101 spin_lock_init(&dev->n_mcast_grps_lock);
2102 init_timer(&dev->mem_timer);
2103 dev->mem_timer.function = mem_timer;
2104 dev->mem_timer.data = (unsigned long) dev;
2105
2106 qib_init_qpn_table(dd, &dev->qpn_table);
2107
2108 /*
2109 * The top ib_qib_lkey_table_size bits are used to index the
2110 * table. The lower 8 bits can be owned by the user (copied from
2111 * the LKEY). The remaining bits act as a generation number or tag.
2112 */
2113 spin_lock_init(&dev->lk_table.lock);
2114 /* insure generation is at least 4 bits see keys.c */
2115 if (ib_qib_lkey_table_size > MAX_LKEY_TABLE_BITS) {
2116 qib_dev_warn(dd, "lkey bits %u too large, reduced to %u\n",
2117 ib_qib_lkey_table_size, MAX_LKEY_TABLE_BITS);
2118 ib_qib_lkey_table_size = MAX_LKEY_TABLE_BITS;
2119 }
2120 dev->lk_table.max = 1 << ib_qib_lkey_table_size;
2121 lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
2122 dev->lk_table.table = (struct qib_mregion __rcu **)
2123 vmalloc(lk_tab_size);
2124 if (dev->lk_table.table == NULL) {
2125 ret = -ENOMEM;
2126 goto err_lk;
2127 }
2128 RCU_INIT_POINTER(dev->dma_mr, NULL);
2129 for (i = 0; i < dev->lk_table.max; i++)
2130 RCU_INIT_POINTER(dev->lk_table.table[i], NULL);
2131 INIT_LIST_HEAD(&dev->pending_mmaps);
2132 spin_lock_init(&dev->pending_lock);
2133 dev->mmap_offset = PAGE_SIZE;
2134 spin_lock_init(&dev->mmap_offset_lock);
2135 INIT_LIST_HEAD(&dev->piowait);
2136 INIT_LIST_HEAD(&dev->dmawait);
2137 INIT_LIST_HEAD(&dev->txwait);
2138 INIT_LIST_HEAD(&dev->memwait);
2139 INIT_LIST_HEAD(&dev->txreq_free);
2140
2141 if (ppd->sdma_descq_cnt) {
2142 dev->pio_hdrs = dma_alloc_coherent(&dd->pcidev->dev,
2143 ppd->sdma_descq_cnt *
2144 sizeof(struct qib_pio_header),
2145 &dev->pio_hdrs_phys,
2146 GFP_KERNEL);
2147 if (!dev->pio_hdrs) {
2148 ret = -ENOMEM;
2149 goto err_hdrs;
2150 }
2151 }
2152
2153 for (i = 0; i < ppd->sdma_descq_cnt; i++) {
2154 struct qib_verbs_txreq *tx;
2155
2156 tx = kzalloc(sizeof(*tx), GFP_KERNEL);
2157 if (!tx) {
2158 ret = -ENOMEM;
2159 goto err_tx;
2160 }
2161 tx->hdr_inx = i;
2162 list_add(&tx->txreq.list, &dev->txreq_free);
2163 }
2164
2165 /*
2166 * The system image GUID is supposed to be the same for all
2167 * IB HCAs in a single system but since there can be other
2168 * device types in the system, we can't be sure this is unique.
2169 */
2170 if (!ib_qib_sys_image_guid)
2171 ib_qib_sys_image_guid = ppd->guid;
2172
2173 strlcpy(ibdev->name, "qib%d", IB_DEVICE_NAME_MAX);
2174 ibdev->owner = THIS_MODULE;
2175 ibdev->node_guid = ppd->guid;
2176 ibdev->uverbs_abi_ver = QIB_UVERBS_ABI_VERSION;
2177 ibdev->uverbs_cmd_mask =
2178 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
2179 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
2180 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
2181 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
2182 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
2183 (1ull << IB_USER_VERBS_CMD_CREATE_AH) |
2184 (1ull << IB_USER_VERBS_CMD_MODIFY_AH) |
2185 (1ull << IB_USER_VERBS_CMD_QUERY_AH) |
2186 (1ull << IB_USER_VERBS_CMD_DESTROY_AH) |
2187 (1ull << IB_USER_VERBS_CMD_REG_MR) |
2188 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
2189 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
2190 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
2191 (1ull << IB_USER_VERBS_CMD_RESIZE_CQ) |
2192 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
2193 (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
2194 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
2195 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
2196 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
2197 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
2198 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
2199 (1ull << IB_USER_VERBS_CMD_POST_SEND) |
2200 (1ull << IB_USER_VERBS_CMD_POST_RECV) |
2201 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
2202 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
2203 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
2204 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
2205 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
2206 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ) |
2207 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
2208 ibdev->node_type = RDMA_NODE_IB_CA;
2209 ibdev->phys_port_cnt = dd->num_pports;
2210 ibdev->num_comp_vectors = 1;
2211 ibdev->dma_device = &dd->pcidev->dev;
2212 ibdev->query_device = qib_query_device;
2213 ibdev->modify_device = qib_modify_device;
2214 ibdev->query_port = qib_query_port;
2215 ibdev->modify_port = qib_modify_port;
2216 ibdev->query_pkey = qib_query_pkey;
2217 ibdev->query_gid = qib_query_gid;
2218 ibdev->alloc_ucontext = qib_alloc_ucontext;
2219 ibdev->dealloc_ucontext = qib_dealloc_ucontext;
2220 ibdev->alloc_pd = qib_alloc_pd;
2221 ibdev->dealloc_pd = qib_dealloc_pd;
2222 ibdev->create_ah = qib_create_ah;
2223 ibdev->destroy_ah = qib_destroy_ah;
2224 ibdev->modify_ah = qib_modify_ah;
2225 ibdev->query_ah = qib_query_ah;
2226 ibdev->create_srq = qib_create_srq;
2227 ibdev->modify_srq = qib_modify_srq;
2228 ibdev->query_srq = qib_query_srq;
2229 ibdev->destroy_srq = qib_destroy_srq;
2230 ibdev->create_qp = qib_create_qp;
2231 ibdev->modify_qp = qib_modify_qp;
2232 ibdev->query_qp = qib_query_qp;
2233 ibdev->destroy_qp = qib_destroy_qp;
2234 ibdev->post_send = qib_post_send;
2235 ibdev->post_recv = qib_post_receive;
2236 ibdev->post_srq_recv = qib_post_srq_receive;
2237 ibdev->create_cq = qib_create_cq;
2238 ibdev->destroy_cq = qib_destroy_cq;
2239 ibdev->resize_cq = qib_resize_cq;
2240 ibdev->poll_cq = qib_poll_cq;
2241 ibdev->req_notify_cq = qib_req_notify_cq;
2242 ibdev->get_dma_mr = qib_get_dma_mr;
2243 ibdev->reg_phys_mr = qib_reg_phys_mr;
2244 ibdev->reg_user_mr = qib_reg_user_mr;
2245 ibdev->dereg_mr = qib_dereg_mr;
2246 ibdev->alloc_mr = qib_alloc_mr;
2247 ibdev->alloc_fast_reg_page_list = qib_alloc_fast_reg_page_list;
2248 ibdev->free_fast_reg_page_list = qib_free_fast_reg_page_list;
2249 ibdev->alloc_fmr = qib_alloc_fmr;
2250 ibdev->map_phys_fmr = qib_map_phys_fmr;
2251 ibdev->unmap_fmr = qib_unmap_fmr;
2252 ibdev->dealloc_fmr = qib_dealloc_fmr;
2253 ibdev->attach_mcast = qib_multicast_attach;
2254 ibdev->detach_mcast = qib_multicast_detach;
2255 ibdev->process_mad = qib_process_mad;
2256 ibdev->mmap = qib_mmap;
2257 ibdev->dma_ops = &qib_dma_mapping_ops;
2258 ibdev->get_port_immutable = qib_port_immutable;
2259
2260 snprintf(ibdev->node_desc, sizeof(ibdev->node_desc),
2261 "Intel Infiniband HCA %s", init_utsname()->nodename);
2262
2263 ret = ib_register_device(ibdev, qib_create_port_files);
2264 if (ret)
2265 goto err_reg;
2266
2267 ret = qib_create_agents(dev);
2268 if (ret)
2269 goto err_agents;
2270
2271 ret = qib_verbs_register_sysfs(dd);
2272 if (ret)
2273 goto err_class;
2274
2275 goto bail;
2276
2277 err_class:
2278 qib_free_agents(dev);
2279 err_agents:
2280 ib_unregister_device(ibdev);
2281 err_reg:
2282 err_tx:
2283 while (!list_empty(&dev->txreq_free)) {
2284 struct list_head *l = dev->txreq_free.next;
2285 struct qib_verbs_txreq *tx;
2286
2287 list_del(l);
2288 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
2289 kfree(tx);
2290 }
2291 if (ppd->sdma_descq_cnt)
2292 dma_free_coherent(&dd->pcidev->dev,
2293 ppd->sdma_descq_cnt *
2294 sizeof(struct qib_pio_header),
2295 dev->pio_hdrs, dev->pio_hdrs_phys);
2296 err_hdrs:
2297 vfree(dev->lk_table.table);
2298 err_lk:
2299 kfree(dev->qp_table);
2300 err_qpt:
2301 qib_dev_err(dd, "cannot register verbs: %d!\n", -ret);
2302 bail:
2303 return ret;
2304 }
2305
2306 void qib_unregister_ib_device(struct qib_devdata *dd)
2307 {
2308 struct qib_ibdev *dev = &dd->verbs_dev;
2309 struct ib_device *ibdev = &dev->ibdev;
2310 u32 qps_inuse;
2311 unsigned lk_tab_size;
2312
2313 qib_verbs_unregister_sysfs(dd);
2314
2315 qib_free_agents(dev);
2316
2317 ib_unregister_device(ibdev);
2318
2319 if (!list_empty(&dev->piowait))
2320 qib_dev_err(dd, "piowait list not empty!\n");
2321 if (!list_empty(&dev->dmawait))
2322 qib_dev_err(dd, "dmawait list not empty!\n");
2323 if (!list_empty(&dev->txwait))
2324 qib_dev_err(dd, "txwait list not empty!\n");
2325 if (!list_empty(&dev->memwait))
2326 qib_dev_err(dd, "memwait list not empty!\n");
2327 if (dev->dma_mr)
2328 qib_dev_err(dd, "DMA MR not NULL!\n");
2329
2330 qps_inuse = qib_free_all_qps(dd);
2331 if (qps_inuse)
2332 qib_dev_err(dd, "QP memory leak! %u still in use\n",
2333 qps_inuse);
2334
2335 del_timer_sync(&dev->mem_timer);
2336 qib_free_qpn_table(&dev->qpn_table);
2337 while (!list_empty(&dev->txreq_free)) {
2338 struct list_head *l = dev->txreq_free.next;
2339 struct qib_verbs_txreq *tx;
2340
2341 list_del(l);
2342 tx = list_entry(l, struct qib_verbs_txreq, txreq.list);
2343 kfree(tx);
2344 }
2345 if (dd->pport->sdma_descq_cnt)
2346 dma_free_coherent(&dd->pcidev->dev,
2347 dd->pport->sdma_descq_cnt *
2348 sizeof(struct qib_pio_header),
2349 dev->pio_hdrs, dev->pio_hdrs_phys);
2350 lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
2351 vfree(dev->lk_table.table);
2352 kfree(dev->qp_table);
2353 }
2354
2355 /*
2356 * This must be called with s_lock held.
2357 */
2358 void qib_schedule_send(struct qib_qp *qp)
2359 {
2360 if (qib_send_ok(qp)) {
2361 struct qib_ibport *ibp =
2362 to_iport(qp->ibqp.device, qp->port_num);
2363 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
2364
2365 queue_work(ppd->qib_wq, &qp->s_work);
2366 }
2367 }
Michael's Linux tree.