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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / infiniband / hw / ipath / ipath_verbs.c
blob439c35d4a669978aba8820151f2f6c98f5a47558
1 /*
2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <rdma/ib_mad.h>
35 #include <rdma/ib_user_verbs.h>
36 #include <linux/io.h>
37 #include <linux/slab.h>
38 #include <linux/module.h>
39 #include <linux/utsname.h>
40 #include <linux/rculist.h>
41
42 #include "ipath_kernel.h"
43 #include "ipath_verbs.h"
44 #include "ipath_common.h"
45
46 static unsigned int ib_ipath_qp_table_size = 251;
47 module_param_named(qp_table_size, ib_ipath_qp_table_size, uint, S_IRUGO);
48 MODULE_PARM_DESC(qp_table_size, "QP table size");
49
50 unsigned int ib_ipath_lkey_table_size = 12;
51 module_param_named(lkey_table_size, ib_ipath_lkey_table_size, uint,
52 S_IRUGO);
53 MODULE_PARM_DESC(lkey_table_size,
54 "LKEY table size in bits (2^n, 1 <= n <= 23)");
55
56 static unsigned int ib_ipath_max_pds = 0xFFFF;
57 module_param_named(max_pds, ib_ipath_max_pds, uint, S_IWUSR | S_IRUGO);
58 MODULE_PARM_DESC(max_pds,
59 "Maximum number of protection domains to support");
60
61 static unsigned int ib_ipath_max_ahs = 0xFFFF;
62 module_param_named(max_ahs, ib_ipath_max_ahs, uint, S_IWUSR | S_IRUGO);
63 MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");
64
65 unsigned int ib_ipath_max_cqes = 0x2FFFF;
66 module_param_named(max_cqes, ib_ipath_max_cqes, uint, S_IWUSR | S_IRUGO);
67 MODULE_PARM_DESC(max_cqes,
68 "Maximum number of completion queue entries to support");
69
70 unsigned int ib_ipath_max_cqs = 0x1FFFF;
71 module_param_named(max_cqs, ib_ipath_max_cqs, uint, S_IWUSR | S_IRUGO);
72 MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");
73
74 unsigned int ib_ipath_max_qp_wrs = 0x3FFF;
75 module_param_named(max_qp_wrs, ib_ipath_max_qp_wrs, uint,
76 S_IWUSR | S_IRUGO);
77 MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");
78
79 unsigned int ib_ipath_max_qps = 16384;
80 module_param_named(max_qps, ib_ipath_max_qps, uint, S_IWUSR | S_IRUGO);
81 MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");
82
83 unsigned int ib_ipath_max_sges = 0x60;
84 module_param_named(max_sges, ib_ipath_max_sges, uint, S_IWUSR | S_IRUGO);
85 MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");
86
87 unsigned int ib_ipath_max_mcast_grps = 16384;
88 module_param_named(max_mcast_grps, ib_ipath_max_mcast_grps, uint,
89 S_IWUSR | S_IRUGO);
90 MODULE_PARM_DESC(max_mcast_grps,
91 "Maximum number of multicast groups to support");
92
93 unsigned int ib_ipath_max_mcast_qp_attached = 16;
94 module_param_named(max_mcast_qp_attached, ib_ipath_max_mcast_qp_attached,
95 uint, S_IWUSR | S_IRUGO);
96 MODULE_PARM_DESC(max_mcast_qp_attached,
97 "Maximum number of attached QPs to support");
98
99 unsigned int ib_ipath_max_srqs = 1024;
100 module_param_named(max_srqs, ib_ipath_max_srqs, uint, S_IWUSR | S_IRUGO);
101 MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");
102
103 unsigned int ib_ipath_max_srq_sges = 128;
104 module_param_named(max_srq_sges, ib_ipath_max_srq_sges,
105 uint, S_IWUSR | S_IRUGO);
106 MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");
107
108 unsigned int ib_ipath_max_srq_wrs = 0x1FFFF;
109 module_param_named(max_srq_wrs, ib_ipath_max_srq_wrs,
110 uint, S_IWUSR | S_IRUGO);
111 MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");
112
113 static unsigned int ib_ipath_disable_sma;
114 module_param_named(disable_sma, ib_ipath_disable_sma, uint, S_IWUSR | S_IRUGO);
115 MODULE_PARM_DESC(disable_sma, "Disable the SMA");
116
117 /*
118 * Note that it is OK to post send work requests in the SQE and ERR
119 * states; ipath_do_send() will process them and generate error
120 * completions as per IB 1.2 C10-96.
121 */
122 const int ib_ipath_state_ops[IB_QPS_ERR + 1] = {
123 [IB_QPS_RESET] = 0,
124 [IB_QPS_INIT] = IPATH_POST_RECV_OK,
125 [IB_QPS_RTR] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK,
126 [IB_QPS_RTS] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
127 IPATH_POST_SEND_OK | IPATH_PROCESS_SEND_OK |
128 IPATH_PROCESS_NEXT_SEND_OK,
129 [IB_QPS_SQD] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
130 IPATH_POST_SEND_OK | IPATH_PROCESS_SEND_OK,
131 [IB_QPS_SQE] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
132 IPATH_POST_SEND_OK | IPATH_FLUSH_SEND,
133 [IB_QPS_ERR] = IPATH_POST_RECV_OK | IPATH_FLUSH_RECV |
134 IPATH_POST_SEND_OK | IPATH_FLUSH_SEND,
135 };
136
137 struct ipath_ucontext {
138 struct ib_ucontext ibucontext;
139 };
140
141 static inline struct ipath_ucontext *to_iucontext(struct ib_ucontext
142 *ibucontext)
143 {
144 return container_of(ibucontext, struct ipath_ucontext, ibucontext);
145 }
146
147 /*
148 * Translate ib_wr_opcode into ib_wc_opcode.
149 */
150 const enum ib_wc_opcode ib_ipath_wc_opcode[] = {
151 [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
152 [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
153 [IB_WR_SEND] = IB_WC_SEND,
154 [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
155 [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
156 [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
157 [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD
158 };
159
160 /*
161 * System image GUID.
162 */
163 static __be64 sys_image_guid;
164
165 /**
166 * ipath_copy_sge - copy data to SGE memory
167 * @ss: the SGE state
168 * @data: the data to copy
169 * @length: the length of the data
170 */
171 void ipath_copy_sge(struct ipath_sge_state *ss, void *data, u32 length)
172 {
173 struct ipath_sge *sge = &ss->sge;
174
175 while (length) {
176 u32 len = sge->length;
177
178 if (len > length)
179 len = length;
180 if (len > sge->sge_length)
181 len = sge->sge_length;
182 BUG_ON(len == 0);
183 memcpy(sge->vaddr, data, len);
184 sge->vaddr += len;
185 sge->length -= len;
186 sge->sge_length -= len;
187 if (sge->sge_length == 0) {
188 if (--ss->num_sge)
189 *sge = *ss->sg_list++;
190 } else if (sge->length == 0 && sge->mr != NULL) {
191 if (++sge->n >= IPATH_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 * ipath_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 ipath_skip_sge(struct ipath_sge_state *ss, u32 length)
212 {
213 struct ipath_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 (--ss->num_sge)
228 *sge = *ss->sg_list++;
229 } else if (sge->length == 0 && sge->mr != NULL) {
230 if (++sge->n >= IPATH_SEGSZ) {
231 if (++sge->m >= sge->mr->mapsz)
232 break;
233 sge->n = 0;
234 }
235 sge->vaddr =
236 sge->mr->map[sge->m]->segs[sge->n].vaddr;
237 sge->length =
238 sge->mr->map[sge->m]->segs[sge->n].length;
239 }
240 length -= len;
241 }
242 }
243
244 /*
245 * Count the number of DMA descriptors needed to send length bytes of data.
246 * Don't modify the ipath_sge_state to get the count.
247 * Return zero if any of the segments is not aligned.
248 */
249 static u32 ipath_count_sge(struct ipath_sge_state *ss, u32 length)
250 {
251 struct ipath_sge *sg_list = ss->sg_list;
252 struct ipath_sge sge = ss->sge;
253 u8 num_sge = ss->num_sge;
254 u32 ndesc = 1; /* count the header */
255
256 while (length) {
257 u32 len = sge.length;
258
259 if (len > length)
260 len = length;
261 if (len > sge.sge_length)
262 len = sge.sge_length;
263 BUG_ON(len == 0);
264 if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
265 (len != length && (len & (sizeof(u32) - 1)))) {
266 ndesc = 0;
267 break;
268 }
269 ndesc++;
270 sge.vaddr += len;
271 sge.length -= len;
272 sge.sge_length -= len;
273 if (sge.sge_length == 0) {
274 if (--num_sge)
275 sge = *sg_list++;
276 } else if (sge.length == 0 && sge.mr != NULL) {
277 if (++sge.n >= IPATH_SEGSZ) {
278 if (++sge.m >= sge.mr->mapsz)
279 break;
280 sge.n = 0;
281 }
282 sge.vaddr =
283 sge.mr->map[sge.m]->segs[sge.n].vaddr;
284 sge.length =
285 sge.mr->map[sge.m]->segs[sge.n].length;
286 }
287 length -= len;
288 }
289 return ndesc;
290 }
291
292 /*
293 * Copy from the SGEs to the data buffer.
294 */
295 static void ipath_copy_from_sge(void *data, struct ipath_sge_state *ss,
296 u32 length)
297 {
298 struct ipath_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 != NULL) {
316 if (++sge->n >= IPATH_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 * ipath_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 ipath_post_one_send(struct ipath_qp *qp, struct ib_send_wr *wr)
337 {
338 struct ipath_swqe *wqe;
339 u32 next;
340 int i;
341 int j;
342 int acc;
343 int ret;
344 unsigned long flags;
345 struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
346
347 spin_lock_irqsave(&qp->s_lock, flags);
348
349 if (qp->ibqp.qp_type != IB_QPT_SMI &&
350 !(dd->ipath_flags & IPATH_LINKACTIVE)) {
351 ret = -ENETDOWN;
352 goto bail;
353 }
354
355 /* Check that state is OK to post send. */
356 if (unlikely(!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK)))
357 goto bail_inval;
358
359 /* IB spec says that num_sge == 0 is OK. */
360 if (wr->num_sge > qp->s_max_sge)
361 goto bail_inval;
362
363 /*
364 * Don't allow RDMA reads or atomic operations on UC or
365 * undefined operations.
366 * Make sure buffer is large enough to hold the result for atomics.
367 */
368 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_UD) {
372 /* Check 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 wqe = get_swqe_ptr(qp, qp->s_head);
398 wqe->wr = *wr;
399 wqe->length = 0;
400 if (wr->num_sge) {
401 acc = wr->opcode >= IB_WR_RDMA_READ ?
402 IB_ACCESS_LOCAL_WRITE : 0;
403 for (i = 0, j = 0; i < wr->num_sge; i++) {
404 u32 length = wr->sg_list[i].length;
405 int ok;
406
407 if (length == 0)
408 continue;
409 ok = ipath_lkey_ok(qp, &wqe->sg_list[j],
410 &wr->sg_list[i], acc);
411 if (!ok)
412 goto bail_inval;
413 wqe->length += length;
414 j++;
415 }
416 wqe->wr.num_sge = j;
417 }
418 if (qp->ibqp.qp_type == IB_QPT_UC ||
419 qp->ibqp.qp_type == IB_QPT_RC) {
420 if (wqe->length > 0x80000000U)
421 goto bail_inval;
422 } else if (wqe->length > to_idev(qp->ibqp.device)->dd->ipath_ibmtu)
423 goto bail_inval;
424 wqe->ssn = qp->s_ssn++;
425 qp->s_head = next;
426
427 ret = 0;
428 goto bail;
429
430 bail_inval:
431 ret = -EINVAL;
432 bail:
433 spin_unlock_irqrestore(&qp->s_lock, flags);
434 return ret;
435 }
436
437 /**
438 * ipath_post_send - post a send on a QP
439 * @ibqp: the QP to post the send on
440 * @wr: the list of work requests to post
441 * @bad_wr: the first bad WR is put here
442 *
443 * This may be called from interrupt context.
444 */
445 static int ipath_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
446 struct ib_send_wr **bad_wr)
447 {
448 struct ipath_qp *qp = to_iqp(ibqp);
449 int err = 0;
450
451 for (; wr; wr = wr->next) {
452 err = ipath_post_one_send(qp, wr);
453 if (err) {
454 *bad_wr = wr;
455 goto bail;
456 }
457 }
458
459 /* Try to do the send work in the caller's context. */
460 ipath_do_send((unsigned long) qp);
461
462 bail:
463 return err;
464 }
465
466 /**
467 * ipath_post_receive - post a receive on a QP
468 * @ibqp: the QP to post the receive on
469 * @wr: the WR to post
470 * @bad_wr: the first bad WR is put here
471 *
472 * This may be called from interrupt context.
473 */
474 static int ipath_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
475 struct ib_recv_wr **bad_wr)
476 {
477 struct ipath_qp *qp = to_iqp(ibqp);
478 struct ipath_rwq *wq = qp->r_rq.wq;
479 unsigned long flags;
480 int ret;
481
482 /* Check that state is OK to post receive. */
483 if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_RECV_OK) || !wq) {
484 *bad_wr = wr;
485 ret = -EINVAL;
486 goto bail;
487 }
488
489 for (; wr; wr = wr->next) {
490 struct ipath_rwqe *wqe;
491 u32 next;
492 int i;
493
494 if ((unsigned) wr->num_sge > qp->r_rq.max_sge) {
495 *bad_wr = wr;
496 ret = -EINVAL;
497 goto bail;
498 }
499
500 spin_lock_irqsave(&qp->r_rq.lock, flags);
501 next = wq->head + 1;
502 if (next >= qp->r_rq.size)
503 next = 0;
504 if (next == wq->tail) {
505 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
506 *bad_wr = wr;
507 ret = -ENOMEM;
508 goto bail;
509 }
510
511 wqe = get_rwqe_ptr(&qp->r_rq, wq->head);
512 wqe->wr_id = wr->wr_id;
513 wqe->num_sge = wr->num_sge;
514 for (i = 0; i < wr->num_sge; i++)
515 wqe->sg_list[i] = wr->sg_list[i];
516 /* Make sure queue entry is written before the head index. */
517 smp_wmb();
518 wq->head = next;
519 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
520 }
521 ret = 0;
522
523 bail:
524 return ret;
525 }
526
527 /**
528 * ipath_qp_rcv - processing an incoming packet on a QP
529 * @dev: the device the packet came on
530 * @hdr: the packet header
531 * @has_grh: true if the packet has a GRH
532 * @data: the packet data
533 * @tlen: the packet length
534 * @qp: the QP the packet came on
535 *
536 * This is called from ipath_ib_rcv() to process an incoming packet
537 * for the given QP.
538 * Called at interrupt level.
539 */
540 static void ipath_qp_rcv(struct ipath_ibdev *dev,
541 struct ipath_ib_header *hdr, int has_grh,
542 void *data, u32 tlen, struct ipath_qp *qp)
543 {
544 /* Check for valid receive state. */
545 if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
546 dev->n_pkt_drops++;
547 return;
548 }
549
550 switch (qp->ibqp.qp_type) {
551 case IB_QPT_SMI:
552 case IB_QPT_GSI:
553 if (ib_ipath_disable_sma)
554 break;
555 /* FALLTHROUGH */
556 case IB_QPT_UD:
557 ipath_ud_rcv(dev, hdr, has_grh, data, tlen, qp);
558 break;
559
560 case IB_QPT_RC:
561 ipath_rc_rcv(dev, hdr, has_grh, data, tlen, qp);
562 break;
563
564 case IB_QPT_UC:
565 ipath_uc_rcv(dev, hdr, has_grh, data, tlen, qp);
566 break;
567
568 default:
569 break;
570 }
571 }
572
573 /**
574 * ipath_ib_rcv - process an incoming packet
575 * @arg: the device pointer
576 * @rhdr: the header of the packet
577 * @data: the packet data
578 * @tlen: the packet length
579 *
580 * This is called from ipath_kreceive() to process an incoming packet at
581 * interrupt level. Tlen is the length of the header + data + CRC in bytes.
582 */
583 void ipath_ib_rcv(struct ipath_ibdev *dev, void *rhdr, void *data,
584 u32 tlen)
585 {
586 struct ipath_ib_header *hdr = rhdr;
587 struct ipath_other_headers *ohdr;
588 struct ipath_qp *qp;
589 u32 qp_num;
590 int lnh;
591 u8 opcode;
592 u16 lid;
593
594 if (unlikely(dev == NULL))
595 goto bail;
596
597 if (unlikely(tlen < 24)) { /* LRH+BTH+CRC */
598 dev->rcv_errors++;
599 goto bail;
600 }
601
602 /* Check for a valid destination LID (see ch. 7.11.1). */
603 lid = be16_to_cpu(hdr->lrh[1]);
604 if (lid < IPATH_MULTICAST_LID_BASE) {
605 lid &= ~((1 << dev->dd->ipath_lmc) - 1);
606 if (unlikely(lid != dev->dd->ipath_lid)) {
607 dev->rcv_errors++;
608 goto bail;
609 }
610 }
611
612 /* Check for GRH */
613 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
614 if (lnh == IPATH_LRH_BTH)
615 ohdr = &hdr->u.oth;
616 else if (lnh == IPATH_LRH_GRH)
617 ohdr = &hdr->u.l.oth;
618 else {
619 dev->rcv_errors++;
620 goto bail;
621 }
622
623 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
624 dev->opstats[opcode].n_bytes += tlen;
625 dev->opstats[opcode].n_packets++;
626
627 /* Get the destination QP number. */
628 qp_num = be32_to_cpu(ohdr->bth[1]) & IPATH_QPN_MASK;
629 if (qp_num == IPATH_MULTICAST_QPN) {
630 struct ipath_mcast *mcast;
631 struct ipath_mcast_qp *p;
632
633 if (lnh != IPATH_LRH_GRH) {
634 dev->n_pkt_drops++;
635 goto bail;
636 }
637 mcast = ipath_mcast_find(&hdr->u.l.grh.dgid);
638 if (mcast == NULL) {
639 dev->n_pkt_drops++;
640 goto bail;
641 }
642 dev->n_multicast_rcv++;
643 list_for_each_entry_rcu(p, &mcast->qp_list, list)
644 ipath_qp_rcv(dev, hdr, 1, data, tlen, p->qp);
645 /*
646 * Notify ipath_multicast_detach() if it is waiting for us
647 * to finish.
648 */
649 if (atomic_dec_return(&mcast->refcount) <= 1)
650 wake_up(&mcast->wait);
651 } else {
652 qp = ipath_lookup_qpn(&dev->qp_table, qp_num);
653 if (qp) {
654 dev->n_unicast_rcv++;
655 ipath_qp_rcv(dev, hdr, lnh == IPATH_LRH_GRH, data,
656 tlen, qp);
657 /*
658 * Notify ipath_destroy_qp() if it is waiting
659 * for us to finish.
660 */
661 if (atomic_dec_and_test(&qp->refcount))
662 wake_up(&qp->wait);
663 } else
664 dev->n_pkt_drops++;
665 }
666
667 bail:;
668 }
669
670 /**
671 * ipath_ib_timer - verbs timer
672 * @arg: the device pointer
673 *
674 * This is called from ipath_do_rcv_timer() at interrupt level to check for
675 * QPs which need retransmits and to collect performance numbers.
676 */
677 static void ipath_ib_timer(struct ipath_ibdev *dev)
678 {
679 struct ipath_qp *resend = NULL;
680 struct ipath_qp *rnr = NULL;
681 struct list_head *last;
682 struct ipath_qp *qp;
683 unsigned long flags;
684
685 if (dev == NULL)
686 return;
687
688 spin_lock_irqsave(&dev->pending_lock, flags);
689 /* Start filling the next pending queue. */
690 if (++dev->pending_index >= ARRAY_SIZE(dev->pending))
691 dev->pending_index = 0;
692 /* Save any requests still in the new queue, they have timed out. */
693 last = &dev->pending[dev->pending_index];
694 while (!list_empty(last)) {
695 qp = list_entry(last->next, struct ipath_qp, timerwait);
696 list_del_init(&qp->timerwait);
697 qp->timer_next = resend;
698 resend = qp;
699 atomic_inc(&qp->refcount);
700 }
701 last = &dev->rnrwait;
702 if (!list_empty(last)) {
703 qp = list_entry(last->next, struct ipath_qp, timerwait);
704 if (--qp->s_rnr_timeout == 0) {
705 do {
706 list_del_init(&qp->timerwait);
707 qp->timer_next = rnr;
708 rnr = qp;
709 atomic_inc(&qp->refcount);
710 if (list_empty(last))
711 break;
712 qp = list_entry(last->next, struct ipath_qp,
713 timerwait);
714 } while (qp->s_rnr_timeout == 0);
715 }
716 }
717 /*
718 * We should only be in the started state if pma_sample_start != 0
719 */
720 if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_STARTED &&
721 --dev->pma_sample_start == 0) {
722 dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_RUNNING;
723 ipath_snapshot_counters(dev->dd, &dev->ipath_sword,
724 &dev->ipath_rword,
725 &dev->ipath_spkts,
726 &dev->ipath_rpkts,
727 &dev->ipath_xmit_wait);
728 }
729 if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_RUNNING) {
730 if (dev->pma_sample_interval == 0) {
731 u64 ta, tb, tc, td, te;
732
733 dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_DONE;
734 ipath_snapshot_counters(dev->dd, &ta, &tb,
735 &tc, &td, &te);
736
737 dev->ipath_sword = ta - dev->ipath_sword;
738 dev->ipath_rword = tb - dev->ipath_rword;
739 dev->ipath_spkts = tc - dev->ipath_spkts;
740 dev->ipath_rpkts = td - dev->ipath_rpkts;
741 dev->ipath_xmit_wait = te - dev->ipath_xmit_wait;
742 }
743 else
744 dev->pma_sample_interval--;
745 }
746 spin_unlock_irqrestore(&dev->pending_lock, flags);
747
748 /* XXX What if timer fires again while this is running? */
749 while (resend != NULL) {
750 qp = resend;
751 resend = qp->timer_next;
752
753 spin_lock_irqsave(&qp->s_lock, flags);
754 if (qp->s_last != qp->s_tail &&
755 ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) {
756 dev->n_timeouts++;
757 ipath_restart_rc(qp, qp->s_last_psn + 1);
758 }
759 spin_unlock_irqrestore(&qp->s_lock, flags);
760
761 /* Notify ipath_destroy_qp() if it is waiting. */
762 if (atomic_dec_and_test(&qp->refcount))
763 wake_up(&qp->wait);
764 }
765 while (rnr != NULL) {
766 qp = rnr;
767 rnr = qp->timer_next;
768
769 spin_lock_irqsave(&qp->s_lock, flags);
770 if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)
771 ipath_schedule_send(qp);
772 spin_unlock_irqrestore(&qp->s_lock, flags);
773
774 /* Notify ipath_destroy_qp() if it is waiting. */
775 if (atomic_dec_and_test(&qp->refcount))
776 wake_up(&qp->wait);
777 }
778 }
779
780 static void update_sge(struct ipath_sge_state *ss, u32 length)
781 {
782 struct ipath_sge *sge = &ss->sge;
783
784 sge->vaddr += length;
785 sge->length -= length;
786 sge->sge_length -= length;
787 if (sge->sge_length == 0) {
788 if (--ss->num_sge)
789 *sge = *ss->sg_list++;
790 } else if (sge->length == 0 && sge->mr != NULL) {
791 if (++sge->n >= IPATH_SEGSZ) {
792 if (++sge->m >= sge->mr->mapsz)
793 return;
794 sge->n = 0;
795 }
796 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
797 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
798 }
799 }
800
801 #ifdef __LITTLE_ENDIAN
802 static inline u32 get_upper_bits(u32 data, u32 shift)
803 {
804 return data >> shift;
805 }
806
807 static inline u32 set_upper_bits(u32 data, u32 shift)
808 {
809 return data << shift;
810 }
811
812 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
813 {
814 data <<= ((sizeof(u32) - n) * BITS_PER_BYTE);
815 data >>= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
816 return data;
817 }
818 #else
819 static inline u32 get_upper_bits(u32 data, u32 shift)
820 {
821 return data << shift;
822 }
823
824 static inline u32 set_upper_bits(u32 data, u32 shift)
825 {
826 return data >> shift;
827 }
828
829 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
830 {
831 data >>= ((sizeof(u32) - n) * BITS_PER_BYTE);
832 data <<= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
833 return data;
834 }
835 #endif
836
837 static void copy_io(u32 __iomem *piobuf, struct ipath_sge_state *ss,
838 u32 length, unsigned flush_wc)
839 {
840 u32 extra = 0;
841 u32 data = 0;
842 u32 last;
843
844 while (1) {
845 u32 len = ss->sge.length;
846 u32 off;
847
848 if (len > length)
849 len = length;
850 if (len > ss->sge.sge_length)
851 len = ss->sge.sge_length;
852 BUG_ON(len == 0);
853 /* If the source address is not aligned, try to align it. */
854 off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
855 if (off) {
856 u32 *addr = (u32 *)((unsigned long)ss->sge.vaddr &
857 ~(sizeof(u32) - 1));
858 u32 v = get_upper_bits(*addr, off * BITS_PER_BYTE);
859 u32 y;
860
861 y = sizeof(u32) - off;
862 if (len > y)
863 len = y;
864 if (len + extra >= sizeof(u32)) {
865 data |= set_upper_bits(v, extra *
866 BITS_PER_BYTE);
867 len = sizeof(u32) - extra;
868 if (len == length) {
869 last = data;
870 break;
871 }
872 __raw_writel(data, piobuf);
873 piobuf++;
874 extra = 0;
875 data = 0;
876 } else {
877 /* Clear unused upper bytes */
878 data |= clear_upper_bytes(v, len, extra);
879 if (len == length) {
880 last = data;
881 break;
882 }
883 extra += len;
884 }
885 } else if (extra) {
886 /* Source address is aligned. */
887 u32 *addr = (u32 *) ss->sge.vaddr;
888 int shift = extra * BITS_PER_BYTE;
889 int ushift = 32 - shift;
890 u32 l = len;
891
892 while (l >= sizeof(u32)) {
893 u32 v = *addr;
894
895 data |= set_upper_bits(v, shift);
896 __raw_writel(data, piobuf);
897 data = get_upper_bits(v, ushift);
898 piobuf++;
899 addr++;
900 l -= sizeof(u32);
901 }
902 /*
903 * We still have 'extra' number of bytes leftover.
904 */
905 if (l) {
906 u32 v = *addr;
907
908 if (l + extra >= sizeof(u32)) {
909 data |= set_upper_bits(v, shift);
910 len -= l + extra - sizeof(u32);
911 if (len == length) {
912 last = data;
913 break;
914 }
915 __raw_writel(data, piobuf);
916 piobuf++;
917 extra = 0;
918 data = 0;
919 } else {
920 /* Clear unused upper bytes */
921 data |= clear_upper_bytes(v, l,
922 extra);
923 if (len == length) {
924 last = data;
925 break;
926 }
927 extra += l;
928 }
929 } else if (len == length) {
930 last = data;
931 break;
932 }
933 } else if (len == length) {
934 u32 w;
935
936 /*
937 * Need to round up for the last dword in the
938 * packet.
939 */
940 w = (len + 3) >> 2;
941 __iowrite32_copy(piobuf, ss->sge.vaddr, w - 1);
942 piobuf += w - 1;
943 last = ((u32 *) ss->sge.vaddr)[w - 1];
944 break;
945 } else {
946 u32 w = len >> 2;
947
948 __iowrite32_copy(piobuf, ss->sge.vaddr, w);
949 piobuf += w;
950
951 extra = len & (sizeof(u32) - 1);
952 if (extra) {
953 u32 v = ((u32 *) ss->sge.vaddr)[w];
954
955 /* Clear unused upper bytes */
956 data = clear_upper_bytes(v, extra, 0);
957 }
958 }
959 update_sge(ss, len);
960 length -= len;
961 }
962 /* Update address before sending packet. */
963 update_sge(ss, length);
964 if (flush_wc) {
965 /* must flush early everything before trigger word */
966 ipath_flush_wc();
967 __raw_writel(last, piobuf);
968 /* be sure trigger word is written */
969 ipath_flush_wc();
970 } else
971 __raw_writel(last, piobuf);
972 }
973
974 /*
975 * Convert IB rate to delay multiplier.
976 */
977 unsigned ipath_ib_rate_to_mult(enum ib_rate rate)
978 {
979 switch (rate) {
980 case IB_RATE_2_5_GBPS: return 8;
981 case IB_RATE_5_GBPS: return 4;
982 case IB_RATE_10_GBPS: return 2;
983 case IB_RATE_20_GBPS: return 1;
984 default: return 0;
985 }
986 }
987
988 /*
989 * Convert delay multiplier to IB rate
990 */
991 static enum ib_rate ipath_mult_to_ib_rate(unsigned mult)
992 {
993 switch (mult) {
994 case 8: return IB_RATE_2_5_GBPS;
995 case 4: return IB_RATE_5_GBPS;
996 case 2: return IB_RATE_10_GBPS;
997 case 1: return IB_RATE_20_GBPS;
998 default: return IB_RATE_PORT_CURRENT;
999 }
1000 }
1001
1002 static inline struct ipath_verbs_txreq *get_txreq(struct ipath_ibdev *dev)
1003 {
1004 struct ipath_verbs_txreq *tx = NULL;
1005 unsigned long flags;
1006
1007 spin_lock_irqsave(&dev->pending_lock, flags);
1008 if (!list_empty(&dev->txreq_free)) {
1009 struct list_head *l = dev->txreq_free.next;
1010
1011 list_del(l);
1012 tx = list_entry(l, struct ipath_verbs_txreq, txreq.list);
1013 }
1014 spin_unlock_irqrestore(&dev->pending_lock, flags);
1015 return tx;
1016 }
1017
1018 static inline void put_txreq(struct ipath_ibdev *dev,
1019 struct ipath_verbs_txreq *tx)
1020 {
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&dev->pending_lock, flags);
1024 list_add(&tx->txreq.list, &dev->txreq_free);
1025 spin_unlock_irqrestore(&dev->pending_lock, flags);
1026 }
1027
1028 static void sdma_complete(void *cookie, int status)
1029 {
1030 struct ipath_verbs_txreq *tx = cookie;
1031 struct ipath_qp *qp = tx->qp;
1032 struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
1033 unsigned long flags;
1034 enum ib_wc_status ibs = status == IPATH_SDMA_TXREQ_S_OK ?
1035 IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR;
1036
1037 if (atomic_dec_and_test(&qp->s_dma_busy)) {
1038 spin_lock_irqsave(&qp->s_lock, flags);
1039 if (tx->wqe)
1040 ipath_send_complete(qp, tx->wqe, ibs);
1041 if ((ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND &&
1042 qp->s_last != qp->s_head) ||
1043 (qp->s_flags & IPATH_S_WAIT_DMA))
1044 ipath_schedule_send(qp);
1045 spin_unlock_irqrestore(&qp->s_lock, flags);
1046 wake_up(&qp->wait_dma);
1047 } else if (tx->wqe) {
1048 spin_lock_irqsave(&qp->s_lock, flags);
1049 ipath_send_complete(qp, tx->wqe, ibs);
1050 spin_unlock_irqrestore(&qp->s_lock, flags);
1051 }
1052
1053 if (tx->txreq.flags & IPATH_SDMA_TXREQ_F_FREEBUF)
1054 kfree(tx->txreq.map_addr);
1055 put_txreq(dev, tx);
1056
1057 if (atomic_dec_and_test(&qp->refcount))
1058 wake_up(&qp->wait);
1059 }
1060
1061 static void decrement_dma_busy(struct ipath_qp *qp)
1062 {
1063 unsigned long flags;
1064
1065 if (atomic_dec_and_test(&qp->s_dma_busy)) {
1066 spin_lock_irqsave(&qp->s_lock, flags);
1067 if ((ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND &&
1068 qp->s_last != qp->s_head) ||
1069 (qp->s_flags & IPATH_S_WAIT_DMA))
1070 ipath_schedule_send(qp);
1071 spin_unlock_irqrestore(&qp->s_lock, flags);
1072 wake_up(&qp->wait_dma);
1073 }
1074 }
1075
1076 /*
1077 * Compute the number of clock cycles of delay before sending the next packet.
1078 * The multipliers reflect the number of clocks for the fastest rate so
1079 * one tick at 4xDDR is 8 ticks at 1xSDR.
1080 * If the destination port will take longer to receive a packet than
1081 * the outgoing link can send it, we need to delay sending the next packet
1082 * by the difference in time it takes the receiver to receive and the sender
1083 * to send this packet.
1084 * Note that this delay is always correct for UC and RC but not always
1085 * optimal for UD. For UD, the destination HCA can be different for each
1086 * packet, in which case, we could send packets to a different destination
1087 * while "waiting" for the delay. The overhead for doing this without
1088 * HW support is more than just paying the cost of delaying some packets
1089 * unnecessarily.
1090 */
1091 static inline unsigned ipath_pkt_delay(u32 plen, u8 snd_mult, u8 rcv_mult)
1092 {
1093 return (rcv_mult > snd_mult) ?
1094 (plen * (rcv_mult - snd_mult) + 1) >> 1 : 0;
1095 }
1096
1097 static int ipath_verbs_send_dma(struct ipath_qp *qp,
1098 struct ipath_ib_header *hdr, u32 hdrwords,
1099 struct ipath_sge_state *ss, u32 len,
1100 u32 plen, u32 dwords)
1101 {
1102 struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
1103 struct ipath_devdata *dd = dev->dd;
1104 struct ipath_verbs_txreq *tx;
1105 u32 *piobuf;
1106 u32 control;
1107 u32 ndesc;
1108 int ret;
1109
1110 tx = qp->s_tx;
1111 if (tx) {
1112 qp->s_tx = NULL;
1113 /* resend previously constructed packet */
1114 atomic_inc(&qp->s_dma_busy);
1115 ret = ipath_sdma_verbs_send(dd, tx->ss, tx->len, tx);
1116 if (ret) {
1117 qp->s_tx = tx;
1118 decrement_dma_busy(qp);
1119 }
1120 goto bail;
1121 }
1122
1123 tx = get_txreq(dev);
1124 if (!tx) {
1125 ret = -EBUSY;
1126 goto bail;
1127 }
1128
1129 /*
1130 * Get the saved delay count we computed for the previous packet
1131 * and save the delay count for this packet to be used next time
1132 * we get here.
1133 */
1134 control = qp->s_pkt_delay;
1135 qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
1136
1137 tx->qp = qp;
1138 atomic_inc(&qp->refcount);
1139 tx->wqe = qp->s_wqe;
1140 tx->txreq.callback = sdma_complete;
1141 tx->txreq.callback_cookie = tx;
1142 tx->txreq.flags = IPATH_SDMA_TXREQ_F_HEADTOHOST |
1143 IPATH_SDMA_TXREQ_F_INTREQ | IPATH_SDMA_TXREQ_F_FREEDESC;
1144 if (plen + 1 >= IPATH_SMALLBUF_DWORDS)
1145 tx->txreq.flags |= IPATH_SDMA_TXREQ_F_USELARGEBUF;
1146
1147 /* VL15 packets bypass credit check */
1148 if ((be16_to_cpu(hdr->lrh[0]) >> 12) == 15) {
1149 control |= 1ULL << 31;
1150 tx->txreq.flags |= IPATH_SDMA_TXREQ_F_VL15;
1151 }
1152
1153 if (len) {
1154 /*
1155 * Don't try to DMA if it takes more descriptors than
1156 * the queue holds.
1157 */
1158 ndesc = ipath_count_sge(ss, len);
1159 if (ndesc >= dd->ipath_sdma_descq_cnt)
1160 ndesc = 0;
1161 } else
1162 ndesc = 1;
1163 if (ndesc) {
1164 tx->hdr.pbc[0] = cpu_to_le32(plen);
1165 tx->hdr.pbc[1] = cpu_to_le32(control);
1166 memcpy(&tx->hdr.hdr, hdr, hdrwords << 2);
1167 tx->txreq.sg_count = ndesc;
1168 tx->map_len = (hdrwords + 2) << 2;
1169 tx->txreq.map_addr = &tx->hdr;
1170 atomic_inc(&qp->s_dma_busy);
1171 ret = ipath_sdma_verbs_send(dd, ss, dwords, tx);
1172 if (ret) {
1173 /* save ss and length in dwords */
1174 tx->ss = ss;
1175 tx->len = dwords;
1176 qp->s_tx = tx;
1177 decrement_dma_busy(qp);
1178 }
1179 goto bail;
1180 }
1181
1182 /* Allocate a buffer and copy the header and payload to it. */
1183 tx->map_len = (plen + 1) << 2;
1184 piobuf = kmalloc(tx->map_len, GFP_ATOMIC);
1185 if (unlikely(piobuf == NULL)) {
1186 ret = -EBUSY;
1187 goto err_tx;
1188 }
1189 tx->txreq.map_addr = piobuf;
1190 tx->txreq.flags |= IPATH_SDMA_TXREQ_F_FREEBUF;
1191 tx->txreq.sg_count = 1;
1192
1193 *piobuf++ = (__force u32) cpu_to_le32(plen);
1194 *piobuf++ = (__force u32) cpu_to_le32(control);
1195 memcpy(piobuf, hdr, hdrwords << 2);
1196 ipath_copy_from_sge(piobuf + hdrwords, ss, len);
1197
1198 atomic_inc(&qp->s_dma_busy);
1199 ret = ipath_sdma_verbs_send(dd, NULL, 0, tx);
1200 /*
1201 * If we couldn't queue the DMA request, save the info
1202 * and try again later rather than destroying the
1203 * buffer and undoing the side effects of the copy.
1204 */
1205 if (ret) {
1206 tx->ss = NULL;
1207 tx->len = 0;
1208 qp->s_tx = tx;
1209 decrement_dma_busy(qp);
1210 }
1211 dev->n_unaligned++;
1212 goto bail;
1213
1214 err_tx:
1215 if (atomic_dec_and_test(&qp->refcount))
1216 wake_up(&qp->wait);
1217 put_txreq(dev, tx);
1218 bail:
1219 return ret;
1220 }
1221
1222 static int ipath_verbs_send_pio(struct ipath_qp *qp,
1223 struct ipath_ib_header *ibhdr, u32 hdrwords,
1224 struct ipath_sge_state *ss, u32 len,
1225 u32 plen, u32 dwords)
1226 {
1227 struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
1228 u32 *hdr = (u32 *) ibhdr;
1229 u32 __iomem *piobuf;
1230 unsigned flush_wc;
1231 u32 control;
1232 int ret;
1233 unsigned long flags;
1234
1235 piobuf = ipath_getpiobuf(dd, plen, NULL);
1236 if (unlikely(piobuf == NULL)) {
1237 ret = -EBUSY;
1238 goto bail;
1239 }
1240
1241 /*
1242 * Get the saved delay count we computed for the previous packet
1243 * and save the delay count for this packet to be used next time
1244 * we get here.
1245 */
1246 control = qp->s_pkt_delay;
1247 qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
1248
1249 /* VL15 packets bypass credit check */
1250 if ((be16_to_cpu(ibhdr->lrh[0]) >> 12) == 15)
1251 control |= 1ULL << 31;
1252
1253 /*
1254 * Write the length to the control qword plus any needed flags.
1255 * We have to flush after the PBC for correctness on some cpus
1256 * or WC buffer can be written out of order.
1257 */
1258 writeq(((u64) control << 32) | plen, piobuf);
1259 piobuf += 2;
1260
1261 flush_wc = dd->ipath_flags & IPATH_PIO_FLUSH_WC;
1262 if (len == 0) {
1263 /*
1264 * If there is just the header portion, must flush before
1265 * writing last word of header for correctness, and after
1266 * the last header word (trigger word).
1267 */
1268 if (flush_wc) {
1269 ipath_flush_wc();
1270 __iowrite32_copy(piobuf, hdr, hdrwords - 1);
1271 ipath_flush_wc();
1272 __raw_writel(hdr[hdrwords - 1], piobuf + hdrwords - 1);
1273 ipath_flush_wc();
1274 } else
1275 __iowrite32_copy(piobuf, hdr, hdrwords);
1276 goto done;
1277 }
1278
1279 if (flush_wc)
1280 ipath_flush_wc();
1281 __iowrite32_copy(piobuf, hdr, hdrwords);
1282 piobuf += hdrwords;
1283
1284 /* The common case is aligned and contained in one segment. */
1285 if (likely(ss->num_sge == 1 && len <= ss->sge.length &&
1286 !((unsigned long)ss->sge.vaddr & (sizeof(u32) - 1)))) {
1287 u32 *addr = (u32 *) ss->sge.vaddr;
1288
1289 /* Update address before sending packet. */
1290 update_sge(ss, len);
1291 if (flush_wc) {
1292 __iowrite32_copy(piobuf, addr, dwords - 1);
1293 /* must flush early everything before trigger word */
1294 ipath_flush_wc();
1295 __raw_writel(addr[dwords - 1], piobuf + dwords - 1);
1296 /* be sure trigger word is written */
1297 ipath_flush_wc();
1298 } else
1299 __iowrite32_copy(piobuf, addr, dwords);
1300 goto done;
1301 }
1302 copy_io(piobuf, ss, len, flush_wc);
1303 done:
1304 if (qp->s_wqe) {
1305 spin_lock_irqsave(&qp->s_lock, flags);
1306 ipath_send_complete(qp, qp->s_wqe, IB_WC_SUCCESS);
1307 spin_unlock_irqrestore(&qp->s_lock, flags);
1308 }
1309 ret = 0;
1310 bail:
1311 return ret;
1312 }
1313
1314 /**
1315 * ipath_verbs_send - send a packet
1316 * @qp: the QP to send on
1317 * @hdr: the packet header
1318 * @hdrwords: the number of 32-bit words in the header
1319 * @ss: the SGE to send
1320 * @len: the length of the packet in bytes
1321 */
1322 int ipath_verbs_send(struct ipath_qp *qp, struct ipath_ib_header *hdr,
1323 u32 hdrwords, struct ipath_sge_state *ss, u32 len)
1324 {
1325 struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
1326 u32 plen;
1327 int ret;
1328 u32 dwords = (len + 3) >> 2;
1329
1330 /*
1331 * Calculate the send buffer trigger address.
1332 * The +1 counts for the pbc control dword following the pbc length.
1333 */
1334 plen = hdrwords + dwords + 1;
1335
1336 /*
1337 * VL15 packets (IB_QPT_SMI) will always use PIO, so we
1338 * can defer SDMA restart until link goes ACTIVE without
1339 * worrying about just how we got there.
1340 */
1341 if (qp->ibqp.qp_type == IB_QPT_SMI ||
1342 !(dd->ipath_flags & IPATH_HAS_SEND_DMA))
1343 ret = ipath_verbs_send_pio(qp, hdr, hdrwords, ss, len,
1344 plen, dwords);
1345 else
1346 ret = ipath_verbs_send_dma(qp, hdr, hdrwords, ss, len,
1347 plen, dwords);
1348
1349 return ret;
1350 }
1351
1352 int ipath_snapshot_counters(struct ipath_devdata *dd, u64 *swords,
1353 u64 *rwords, u64 *spkts, u64 *rpkts,
1354 u64 *xmit_wait)
1355 {
1356 int ret;
1357
1358 if (!(dd->ipath_flags & IPATH_INITTED)) {
1359 /* no hardware, freeze, etc. */
1360 ret = -EINVAL;
1361 goto bail;
1362 }
1363 *swords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
1364 *rwords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
1365 *spkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
1366 *rpkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
1367 *xmit_wait = ipath_snap_cntr(dd, dd->ipath_cregs->cr_sendstallcnt);
1368
1369 ret = 0;
1370
1371 bail:
1372 return ret;
1373 }
1374
1375 /**
1376 * ipath_get_counters - get various chip counters
1377 * @dd: the infinipath device
1378 * @cntrs: counters are placed here
1379 *
1380 * Return the counters needed by recv_pma_get_portcounters().
1381 */
1382 int ipath_get_counters(struct ipath_devdata *dd,
1383 struct ipath_verbs_counters *cntrs)
1384 {
1385 struct ipath_cregs const *crp = dd->ipath_cregs;
1386 int ret;
1387
1388 if (!(dd->ipath_flags & IPATH_INITTED)) {
1389 /* no hardware, freeze, etc. */
1390 ret = -EINVAL;
1391 goto bail;
1392 }
1393 cntrs->symbol_error_counter =
1394 ipath_snap_cntr(dd, crp->cr_ibsymbolerrcnt);
1395 cntrs->link_error_recovery_counter =
1396 ipath_snap_cntr(dd, crp->cr_iblinkerrrecovcnt);
1397 /*
1398 * The link downed counter counts when the other side downs the
1399 * connection. We add in the number of times we downed the link
1400 * due to local link integrity errors to compensate.
1401 */
1402 cntrs->link_downed_counter =
1403 ipath_snap_cntr(dd, crp->cr_iblinkdowncnt);
1404 cntrs->port_rcv_errors =
1405 ipath_snap_cntr(dd, crp->cr_rxdroppktcnt) +
1406 ipath_snap_cntr(dd, crp->cr_rcvovflcnt) +
1407 ipath_snap_cntr(dd, crp->cr_portovflcnt) +
1408 ipath_snap_cntr(dd, crp->cr_err_rlencnt) +
1409 ipath_snap_cntr(dd, crp->cr_invalidrlencnt) +
1410 ipath_snap_cntr(dd, crp->cr_errlinkcnt) +
1411 ipath_snap_cntr(dd, crp->cr_erricrccnt) +
1412 ipath_snap_cntr(dd, crp->cr_errvcrccnt) +
1413 ipath_snap_cntr(dd, crp->cr_errlpcrccnt) +
1414 ipath_snap_cntr(dd, crp->cr_badformatcnt) +
1415 dd->ipath_rxfc_unsupvl_errs;
1416 if (crp->cr_rxotherlocalphyerrcnt)
1417 cntrs->port_rcv_errors +=
1418 ipath_snap_cntr(dd, crp->cr_rxotherlocalphyerrcnt);
1419 if (crp->cr_rxvlerrcnt)
1420 cntrs->port_rcv_errors +=
1421 ipath_snap_cntr(dd, crp->cr_rxvlerrcnt);
1422 cntrs->port_rcv_remphys_errors =
1423 ipath_snap_cntr(dd, crp->cr_rcvebpcnt);
1424 cntrs->port_xmit_discards = ipath_snap_cntr(dd, crp->cr_unsupvlcnt);
1425 cntrs->port_xmit_data = ipath_snap_cntr(dd, crp->cr_wordsendcnt);
1426 cntrs->port_rcv_data = ipath_snap_cntr(dd, crp->cr_wordrcvcnt);
1427 cntrs->port_xmit_packets = ipath_snap_cntr(dd, crp->cr_pktsendcnt);
1428 cntrs->port_rcv_packets = ipath_snap_cntr(dd, crp->cr_pktrcvcnt);
1429 cntrs->local_link_integrity_errors =
1430 crp->cr_locallinkintegrityerrcnt ?
1431 ipath_snap_cntr(dd, crp->cr_locallinkintegrityerrcnt) :
1432 ((dd->ipath_flags & IPATH_GPIO_ERRINTRS) ?
1433 dd->ipath_lli_errs : dd->ipath_lli_errors);
1434 cntrs->excessive_buffer_overrun_errors =
1435 crp->cr_excessbufferovflcnt ?
1436 ipath_snap_cntr(dd, crp->cr_excessbufferovflcnt) :
1437 dd->ipath_overrun_thresh_errs;
1438 cntrs->vl15_dropped = crp->cr_vl15droppedpktcnt ?
1439 ipath_snap_cntr(dd, crp->cr_vl15droppedpktcnt) : 0;
1440
1441 ret = 0;
1442
1443 bail:
1444 return ret;
1445 }
1446
1447 /**
1448 * ipath_ib_piobufavail - callback when a PIO buffer is available
1449 * @arg: the device pointer
1450 *
1451 * This is called from ipath_intr() at interrupt level when a PIO buffer is
1452 * available after ipath_verbs_send() returned an error that no buffers were
1453 * available. Return 1 if we consumed all the PIO buffers and we still have
1454 * QPs waiting for buffers (for now, just restart the send tasklet and
1455 * return zero).
1456 */
1457 int ipath_ib_piobufavail(struct ipath_ibdev *dev)
1458 {
1459 struct list_head *list;
1460 struct ipath_qp *qplist;
1461 struct ipath_qp *qp;
1462 unsigned long flags;
1463
1464 if (dev == NULL)
1465 goto bail;
1466
1467 list = &dev->piowait;
1468 qplist = NULL;
1469
1470 spin_lock_irqsave(&dev->pending_lock, flags);
1471 while (!list_empty(list)) {
1472 qp = list_entry(list->next, struct ipath_qp, piowait);
1473 list_del_init(&qp->piowait);
1474 qp->pio_next = qplist;
1475 qplist = qp;
1476 atomic_inc(&qp->refcount);
1477 }
1478 spin_unlock_irqrestore(&dev->pending_lock, flags);
1479
1480 while (qplist != NULL) {
1481 qp = qplist;
1482 qplist = qp->pio_next;
1483
1484 spin_lock_irqsave(&qp->s_lock, flags);
1485 if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)
1486 ipath_schedule_send(qp);
1487 spin_unlock_irqrestore(&qp->s_lock, flags);
1488
1489 /* Notify ipath_destroy_qp() if it is waiting. */
1490 if (atomic_dec_and_test(&qp->refcount))
1491 wake_up(&qp->wait);
1492 }
1493
1494 bail:
1495 return 0;
1496 }
1497
1498 static int ipath_query_device(struct ib_device *ibdev,
1499 struct ib_device_attr *props)
1500 {
1501 struct ipath_ibdev *dev = to_idev(ibdev);
1502
1503 memset(props, 0, sizeof(*props));
1504
1505 props->device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
1506 IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
1507 IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_RC_RNR_NAK_GEN |
1508 IB_DEVICE_PORT_ACTIVE_EVENT | IB_DEVICE_SRQ_RESIZE;
1509 props->page_size_cap = PAGE_SIZE;
1510 props->vendor_id =
1511 IPATH_SRC_OUI_1 << 16 | IPATH_SRC_OUI_2 << 8 | IPATH_SRC_OUI_3;
1512 props->vendor_part_id = dev->dd->ipath_deviceid;
1513 props->hw_ver = dev->dd->ipath_pcirev;
1514
1515 props->sys_image_guid = dev->sys_image_guid;
1516
1517 props->max_mr_size = ~0ull;
1518 props->max_qp = ib_ipath_max_qps;
1519 props->max_qp_wr = ib_ipath_max_qp_wrs;
1520 props->max_sge = ib_ipath_max_sges;
1521 props->max_cq = ib_ipath_max_cqs;
1522 props->max_ah = ib_ipath_max_ahs;
1523 props->max_cqe = ib_ipath_max_cqes;
1524 props->max_mr = dev->lk_table.max;
1525 props->max_fmr = dev->lk_table.max;
1526 props->max_map_per_fmr = 32767;
1527 props->max_pd = ib_ipath_max_pds;
1528 props->max_qp_rd_atom = IPATH_MAX_RDMA_ATOMIC;
1529 props->max_qp_init_rd_atom = 255;
1530 /* props->max_res_rd_atom */
1531 props->max_srq = ib_ipath_max_srqs;
1532 props->max_srq_wr = ib_ipath_max_srq_wrs;
1533 props->max_srq_sge = ib_ipath_max_srq_sges;
1534 /* props->local_ca_ack_delay */
1535 props->atomic_cap = IB_ATOMIC_GLOB;
1536 props->max_pkeys = ipath_get_npkeys(dev->dd);
1537 props->max_mcast_grp = ib_ipath_max_mcast_grps;
1538 props->max_mcast_qp_attach = ib_ipath_max_mcast_qp_attached;
1539 props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
1540 props->max_mcast_grp;
1541
1542 return 0;
1543 }
1544
1545 const u8 ipath_cvt_physportstate[32] = {
1546 [INFINIPATH_IBCS_LT_STATE_DISABLED] = IB_PHYSPORTSTATE_DISABLED,
1547 [INFINIPATH_IBCS_LT_STATE_LINKUP] = IB_PHYSPORTSTATE_LINKUP,
1548 [INFINIPATH_IBCS_LT_STATE_POLLACTIVE] = IB_PHYSPORTSTATE_POLL,
1549 [INFINIPATH_IBCS_LT_STATE_POLLQUIET] = IB_PHYSPORTSTATE_POLL,
1550 [INFINIPATH_IBCS_LT_STATE_SLEEPDELAY] = IB_PHYSPORTSTATE_SLEEP,
1551 [INFINIPATH_IBCS_LT_STATE_SLEEPQUIET] = IB_PHYSPORTSTATE_SLEEP,
1552 [INFINIPATH_IBCS_LT_STATE_CFGDEBOUNCE] =
1553 IB_PHYSPORTSTATE_CFG_TRAIN,
1554 [INFINIPATH_IBCS_LT_STATE_CFGRCVFCFG] =
1555 IB_PHYSPORTSTATE_CFG_TRAIN,
1556 [INFINIPATH_IBCS_LT_STATE_CFGWAITRMT] =
1557 IB_PHYSPORTSTATE_CFG_TRAIN,
1558 [INFINIPATH_IBCS_LT_STATE_CFGIDLE] = IB_PHYSPORTSTATE_CFG_TRAIN,
1559 [INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN] =
1560 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1561 [INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT] =
1562 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1563 [INFINIPATH_IBCS_LT_STATE_RECOVERIDLE] =
1564 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1565 [0x10] = IB_PHYSPORTSTATE_CFG_TRAIN,
1566 [0x11] = IB_PHYSPORTSTATE_CFG_TRAIN,
1567 [0x12] = IB_PHYSPORTSTATE_CFG_TRAIN,
1568 [0x13] = IB_PHYSPORTSTATE_CFG_TRAIN,
1569 [0x14] = IB_PHYSPORTSTATE_CFG_TRAIN,
1570 [0x15] = IB_PHYSPORTSTATE_CFG_TRAIN,
1571 [0x16] = IB_PHYSPORTSTATE_CFG_TRAIN,
1572 [0x17] = IB_PHYSPORTSTATE_CFG_TRAIN
1573 };
1574
1575 u32 ipath_get_cr_errpkey(struct ipath_devdata *dd)
1576 {
1577 return ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
1578 }
1579
1580 static int ipath_query_port(struct ib_device *ibdev,
1581 u8 port, struct ib_port_attr *props)
1582 {
1583 struct ipath_ibdev *dev = to_idev(ibdev);
1584 struct ipath_devdata *dd = dev->dd;
1585 enum ib_mtu mtu;
1586 u16 lid = dd->ipath_lid;
1587 u64 ibcstat;
1588
1589 memset(props, 0, sizeof(*props));
1590 props->lid = lid ? lid : be16_to_cpu(IB_LID_PERMISSIVE);
1591 props->lmc = dd->ipath_lmc;
1592 props->sm_lid = dev->sm_lid;
1593 props->sm_sl = dev->sm_sl;
1594 ibcstat = dd->ipath_lastibcstat;
1595 /* map LinkState to IB portinfo values. */
1596 props->state = ipath_ib_linkstate(dd, ibcstat) + 1;
1597
1598 /* See phys_state_show() */
1599 props->phys_state = /* MEA: assumes shift == 0 */
1600 ipath_cvt_physportstate[dd->ipath_lastibcstat &
1601 dd->ibcs_lts_mask];
1602 props->port_cap_flags = dev->port_cap_flags;
1603 props->gid_tbl_len = 1;
1604 props->max_msg_sz = 0x80000000;
1605 props->pkey_tbl_len = ipath_get_npkeys(dd);
1606 props->bad_pkey_cntr = ipath_get_cr_errpkey(dd) -
1607 dev->z_pkey_violations;
1608 props->qkey_viol_cntr = dev->qkey_violations;
1609 props->active_width = dd->ipath_link_width_active;
1610 /* See rate_show() */
1611 props->active_speed = dd->ipath_link_speed_active;
1612 props->max_vl_num = 1; /* VLCap = VL0 */
1613 props->init_type_reply = 0;
1614
1615 props->max_mtu = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048;
1616 switch (dd->ipath_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 = dev->subnet_timeout;
1637
1638 return 0;
1639 }
1640
1641 static int ipath_modify_device(struct ib_device *device,
1642 int device_modify_mask,
1643 struct ib_device_modify *device_modify)
1644 {
1645 int ret;
1646
1647 if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
1648 IB_DEVICE_MODIFY_NODE_DESC)) {
1649 ret = -EOPNOTSUPP;
1650 goto bail;
1651 }
1652
1653 if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC)
1654 memcpy(device->node_desc, device_modify->node_desc, 64);
1655
1656 if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID)
1657 to_idev(device)->sys_image_guid =
1658 cpu_to_be64(device_modify->sys_image_guid);
1659
1660 ret = 0;
1661
1662 bail:
1663 return ret;
1664 }
1665
1666 static int ipath_modify_port(struct ib_device *ibdev,
1667 u8 port, int port_modify_mask,
1668 struct ib_port_modify *props)
1669 {
1670 struct ipath_ibdev *dev = to_idev(ibdev);
1671
1672 dev->port_cap_flags |= props->set_port_cap_mask;
1673 dev->port_cap_flags &= ~props->clr_port_cap_mask;
1674 if (port_modify_mask & IB_PORT_SHUTDOWN)
1675 ipath_set_linkstate(dev->dd, IPATH_IB_LINKDOWN);
1676 if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
1677 dev->qkey_violations = 0;
1678 return 0;
1679 }
1680
1681 static int ipath_query_gid(struct ib_device *ibdev, u8 port,
1682 int index, union ib_gid *gid)
1683 {
1684 struct ipath_ibdev *dev = to_idev(ibdev);
1685 int ret;
1686
1687 if (index >= 1) {
1688 ret = -EINVAL;
1689 goto bail;
1690 }
1691 gid->global.subnet_prefix = dev->gid_prefix;
1692 gid->global.interface_id = dev->dd->ipath_guid;
1693
1694 ret = 0;
1695
1696 bail:
1697 return ret;
1698 }
1699
1700 static struct ib_pd *ipath_alloc_pd(struct ib_device *ibdev,
1701 struct ib_ucontext *context,
1702 struct ib_udata *udata)
1703 {
1704 struct ipath_ibdev *dev = to_idev(ibdev);
1705 struct ipath_pd *pd;
1706 struct ib_pd *ret;
1707
1708 /*
1709 * This is actually totally arbitrary. Some correctness tests
1710 * assume there's a maximum number of PDs that can be allocated.
1711 * We don't actually have this limit, but we fail the test if
1712 * we allow allocations of more than we report for this value.
1713 */
1714
1715 pd = kmalloc(sizeof *pd, GFP_KERNEL);
1716 if (!pd) {
1717 ret = ERR_PTR(-ENOMEM);
1718 goto bail;
1719 }
1720
1721 spin_lock(&dev->n_pds_lock);
1722 if (dev->n_pds_allocated == ib_ipath_max_pds) {
1723 spin_unlock(&dev->n_pds_lock);
1724 kfree(pd);
1725 ret = ERR_PTR(-ENOMEM);
1726 goto bail;
1727 }
1728
1729 dev->n_pds_allocated++;
1730 spin_unlock(&dev->n_pds_lock);
1731
1732 /* ib_alloc_pd() will initialize pd->ibpd. */
1733 pd->user = udata != NULL;
1734
1735 ret = &pd->ibpd;
1736
1737 bail:
1738 return ret;
1739 }
1740
1741 static int ipath_dealloc_pd(struct ib_pd *ibpd)
1742 {
1743 struct ipath_pd *pd = to_ipd(ibpd);
1744 struct ipath_ibdev *dev = to_idev(ibpd->device);
1745
1746 spin_lock(&dev->n_pds_lock);
1747 dev->n_pds_allocated--;
1748 spin_unlock(&dev->n_pds_lock);
1749
1750 kfree(pd);
1751
1752 return 0;
1753 }
1754
1755 /**
1756 * ipath_create_ah - create an address handle
1757 * @pd: the protection domain
1758 * @ah_attr: the attributes of the AH
1759 *
1760 * This may be called from interrupt context.
1761 */
1762 static struct ib_ah *ipath_create_ah(struct ib_pd *pd,
1763 struct ib_ah_attr *ah_attr)
1764 {
1765 struct ipath_ah *ah;
1766 struct ib_ah *ret;
1767 struct ipath_ibdev *dev = to_idev(pd->device);
1768 unsigned long flags;
1769
1770 /* A multicast address requires a GRH (see ch. 8.4.1). */
1771 if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
1772 ah_attr->dlid != IPATH_PERMISSIVE_LID &&
1773 !(ah_attr->ah_flags & IB_AH_GRH)) {
1774 ret = ERR_PTR(-EINVAL);
1775 goto bail;
1776 }
1777
1778 if (ah_attr->dlid == 0) {
1779 ret = ERR_PTR(-EINVAL);
1780 goto bail;
1781 }
1782
1783 if (ah_attr->port_num < 1 ||
1784 ah_attr->port_num > pd->device->phys_port_cnt) {
1785 ret = ERR_PTR(-EINVAL);
1786 goto bail;
1787 }
1788
1789 ah = kmalloc(sizeof *ah, GFP_ATOMIC);
1790 if (!ah) {
1791 ret = ERR_PTR(-ENOMEM);
1792 goto bail;
1793 }
1794
1795 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1796 if (dev->n_ahs_allocated == ib_ipath_max_ahs) {
1797 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1798 kfree(ah);
1799 ret = ERR_PTR(-ENOMEM);
1800 goto bail;
1801 }
1802
1803 dev->n_ahs_allocated++;
1804 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1805
1806 /* ib_create_ah() will initialize ah->ibah. */
1807 ah->attr = *ah_attr;
1808 ah->attr.static_rate = ipath_ib_rate_to_mult(ah_attr->static_rate);
1809
1810 ret = &ah->ibah;
1811
1812 bail:
1813 return ret;
1814 }
1815
1816 /**
1817 * ipath_destroy_ah - destroy an address handle
1818 * @ibah: the AH to destroy
1819 *
1820 * This may be called from interrupt context.
1821 */
1822 static int ipath_destroy_ah(struct ib_ah *ibah)
1823 {
1824 struct ipath_ibdev *dev = to_idev(ibah->device);
1825 struct ipath_ah *ah = to_iah(ibah);
1826 unsigned long flags;
1827
1828 spin_lock_irqsave(&dev->n_ahs_lock, flags);
1829 dev->n_ahs_allocated--;
1830 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1831
1832 kfree(ah);
1833
1834 return 0;
1835 }
1836
1837 static int ipath_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1838 {
1839 struct ipath_ah *ah = to_iah(ibah);
1840
1841 *ah_attr = ah->attr;
1842 ah_attr->static_rate = ipath_mult_to_ib_rate(ah->attr.static_rate);
1843
1844 return 0;
1845 }
1846
1847 /**
1848 * ipath_get_npkeys - return the size of the PKEY table for port 0
1849 * @dd: the infinipath device
1850 */
1851 unsigned ipath_get_npkeys(struct ipath_devdata *dd)
1852 {
1853 return ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys);
1854 }
1855
1856 /**
1857 * ipath_get_pkey - return the indexed PKEY from the port PKEY table
1858 * @dd: the infinipath device
1859 * @index: the PKEY index
1860 */
1861 unsigned ipath_get_pkey(struct ipath_devdata *dd, unsigned index)
1862 {
1863 unsigned ret;
1864
1865 /* always a kernel port, no locking needed */
1866 if (index >= ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys))
1867 ret = 0;
1868 else
1869 ret = dd->ipath_pd[0]->port_pkeys[index];
1870
1871 return ret;
1872 }
1873
1874 static int ipath_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
1875 u16 *pkey)
1876 {
1877 struct ipath_ibdev *dev = to_idev(ibdev);
1878 int ret;
1879
1880 if (index >= ipath_get_npkeys(dev->dd)) {
1881 ret = -EINVAL;
1882 goto bail;
1883 }
1884
1885 *pkey = ipath_get_pkey(dev->dd, index);
1886 ret = 0;
1887
1888 bail:
1889 return ret;
1890 }
1891
1892 /**
1893 * ipath_alloc_ucontext - allocate a ucontest
1894 * @ibdev: the infiniband device
1895 * @udata: not used by the InfiniPath driver
1896 */
1897
1898 static struct ib_ucontext *ipath_alloc_ucontext(struct ib_device *ibdev,
1899 struct ib_udata *udata)
1900 {
1901 struct ipath_ucontext *context;
1902 struct ib_ucontext *ret;
1903
1904 context = kmalloc(sizeof *context, GFP_KERNEL);
1905 if (!context) {
1906 ret = ERR_PTR(-ENOMEM);
1907 goto bail;
1908 }
1909
1910 ret = &context->ibucontext;
1911
1912 bail:
1913 return ret;
1914 }
1915
1916 static int ipath_dealloc_ucontext(struct ib_ucontext *context)
1917 {
1918 kfree(to_iucontext(context));
1919 return 0;
1920 }
1921
1922 static int ipath_verbs_register_sysfs(struct ib_device *dev);
1923
1924 static void __verbs_timer(unsigned long arg)
1925 {
1926 struct ipath_devdata *dd = (struct ipath_devdata *) arg;
1927
1928 /* Handle verbs layer timeouts. */
1929 ipath_ib_timer(dd->verbs_dev);
1930
1931 mod_timer(&dd->verbs_timer, jiffies + 1);
1932 }
1933
1934 static int enable_timer(struct ipath_devdata *dd)
1935 {
1936 /*
1937 * Early chips had a design flaw where the chip and kernel idea
1938 * of the tail register don't always agree, and therefore we won't
1939 * get an interrupt on the next packet received.
1940 * If the board supports per packet receive interrupts, use it.
1941 * Otherwise, the timer function periodically checks for packets
1942 * to cover this case.
1943 * Either way, the timer is needed for verbs layer related
1944 * processing.
1945 */
1946 if (dd->ipath_flags & IPATH_GPIO_INTR) {
1947 ipath_write_kreg(dd, dd->ipath_kregs->kr_debugportselect,
1948 0x2074076542310ULL);
1949 /* Enable GPIO bit 2 interrupt */
1950 dd->ipath_gpio_mask |= (u64) (1 << IPATH_GPIO_PORT0_BIT);
1951 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1952 dd->ipath_gpio_mask);
1953 }
1954
1955 init_timer(&dd->verbs_timer);
1956 dd->verbs_timer.function = __verbs_timer;
1957 dd->verbs_timer.data = (unsigned long)dd;
1958 dd->verbs_timer.expires = jiffies + 1;
1959 add_timer(&dd->verbs_timer);
1960
1961 return 0;
1962 }
1963
1964 static int disable_timer(struct ipath_devdata *dd)
1965 {
1966 /* Disable GPIO bit 2 interrupt */
1967 if (dd->ipath_flags & IPATH_GPIO_INTR) {
1968 /* Disable GPIO bit 2 interrupt */
1969 dd->ipath_gpio_mask &= ~((u64) (1 << IPATH_GPIO_PORT0_BIT));
1970 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1971 dd->ipath_gpio_mask);
1972 /*
1973 * We might want to undo changes to debugportselect,
1974 * but how?
1975 */
1976 }
1977
1978 del_timer_sync(&dd->verbs_timer);
1979
1980 return 0;
1981 }
1982
1983 /**
1984 * ipath_register_ib_device - register our device with the infiniband core
1985 * @dd: the device data structure
1986 * Return the allocated ipath_ibdev pointer or NULL on error.
1987 */
1988 int ipath_register_ib_device(struct ipath_devdata *dd)
1989 {
1990 struct ipath_verbs_counters cntrs;
1991 struct ipath_ibdev *idev;
1992 struct ib_device *dev;
1993 struct ipath_verbs_txreq *tx;
1994 unsigned i;
1995 int ret;
1996
1997 idev = (struct ipath_ibdev *)ib_alloc_device(sizeof *idev);
1998 if (idev == NULL) {
1999 ret = -ENOMEM;
2000 goto bail;
2001 }
2002
2003 dev = &idev->ibdev;
2004
2005 if (dd->ipath_sdma_descq_cnt) {
2006 tx = kmalloc(dd->ipath_sdma_descq_cnt * sizeof *tx,
2007 GFP_KERNEL);
2008 if (tx == NULL) {
2009 ret = -ENOMEM;
2010 goto err_tx;
2011 }
2012 } else
2013 tx = NULL;
2014 idev->txreq_bufs = tx;
2015
2016 /* Only need to initialize non-zero fields. */
2017 spin_lock_init(&idev->n_pds_lock);
2018 spin_lock_init(&idev->n_ahs_lock);
2019 spin_lock_init(&idev->n_cqs_lock);
2020 spin_lock_init(&idev->n_qps_lock);
2021 spin_lock_init(&idev->n_srqs_lock);
2022 spin_lock_init(&idev->n_mcast_grps_lock);
2023
2024 spin_lock_init(&idev->qp_table.lock);
2025 spin_lock_init(&idev->lk_table.lock);
2026 idev->sm_lid = __constant_be16_to_cpu(IB_LID_PERMISSIVE);
2027 /* Set the prefix to the default value (see ch. 4.1.1) */
2028 idev->gid_prefix = __constant_cpu_to_be64(0xfe80000000000000ULL);
2029
2030 ret = ipath_init_qp_table(idev, ib_ipath_qp_table_size);
2031 if (ret)
2032 goto err_qp;
2033
2034 /*
2035 * The top ib_ipath_lkey_table_size bits are used to index the
2036 * table. The lower 8 bits can be owned by the user (copied from
2037 * the LKEY). The remaining bits act as a generation number or tag.
2038 */
2039 idev->lk_table.max = 1 << ib_ipath_lkey_table_size;
2040 idev->lk_table.table = kzalloc(idev->lk_table.max *
2041 sizeof(*idev->lk_table.table),
2042 GFP_KERNEL);
2043 if (idev->lk_table.table == NULL) {
2044 ret = -ENOMEM;
2045 goto err_lk;
2046 }
2047 INIT_LIST_HEAD(&idev->pending_mmaps);
2048 spin_lock_init(&idev->pending_lock);
2049 idev->mmap_offset = PAGE_SIZE;
2050 spin_lock_init(&idev->mmap_offset_lock);
2051 INIT_LIST_HEAD(&idev->pending[0]);
2052 INIT_LIST_HEAD(&idev->pending[1]);
2053 INIT_LIST_HEAD(&idev->pending[2]);
2054 INIT_LIST_HEAD(&idev->piowait);
2055 INIT_LIST_HEAD(&idev->rnrwait);
2056 INIT_LIST_HEAD(&idev->txreq_free);
2057 idev->pending_index = 0;
2058 idev->port_cap_flags =
2059 IB_PORT_SYS_IMAGE_GUID_SUP | IB_PORT_CLIENT_REG_SUP;
2060 if (dd->ipath_flags & IPATH_HAS_LINK_LATENCY)
2061 idev->port_cap_flags |= IB_PORT_LINK_LATENCY_SUP;
2062 idev->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
2063 idev->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
2064 idev->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
2065 idev->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
2066 idev->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
2067
2068 /* Snapshot current HW counters to "clear" them. */
2069 ipath_get_counters(dd, &cntrs);
2070 idev->z_symbol_error_counter = cntrs.symbol_error_counter;
2071 idev->z_link_error_recovery_counter =
2072 cntrs.link_error_recovery_counter;
2073 idev->z_link_downed_counter = cntrs.link_downed_counter;
2074 idev->z_port_rcv_errors = cntrs.port_rcv_errors;
2075 idev->z_port_rcv_remphys_errors =
2076 cntrs.port_rcv_remphys_errors;
2077 idev->z_port_xmit_discards = cntrs.port_xmit_discards;
2078 idev->z_port_xmit_data = cntrs.port_xmit_data;
2079 idev->z_port_rcv_data = cntrs.port_rcv_data;
2080 idev->z_port_xmit_packets = cntrs.port_xmit_packets;
2081 idev->z_port_rcv_packets = cntrs.port_rcv_packets;
2082 idev->z_local_link_integrity_errors =
2083 cntrs.local_link_integrity_errors;
2084 idev->z_excessive_buffer_overrun_errors =
2085 cntrs.excessive_buffer_overrun_errors;
2086 idev->z_vl15_dropped = cntrs.vl15_dropped;
2087
2088 for (i = 0; i < dd->ipath_sdma_descq_cnt; i++, tx++)
2089 list_add(&tx->txreq.list, &idev->txreq_free);
2090
2091 /*
2092 * The system image GUID is supposed to be the same for all
2093 * IB HCAs in a single system but since there can be other
2094 * device types in the system, we can't be sure this is unique.
2095 */
2096 if (!sys_image_guid)
2097 sys_image_guid = dd->ipath_guid;
2098 idev->sys_image_guid = sys_image_guid;
2099 idev->ib_unit = dd->ipath_unit;
2100 idev->dd = dd;
2101
2102 strlcpy(dev->name, "ipath%d", IB_DEVICE_NAME_MAX);
2103 dev->owner = THIS_MODULE;
2104 dev->node_guid = dd->ipath_guid;
2105 dev->uverbs_abi_ver = IPATH_UVERBS_ABI_VERSION;
2106 dev->uverbs_cmd_mask =
2107 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
2108 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
2109 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
2110 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
2111 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
2112 (1ull << IB_USER_VERBS_CMD_CREATE_AH) |
2113 (1ull << IB_USER_VERBS_CMD_DESTROY_AH) |
2114 (1ull << IB_USER_VERBS_CMD_QUERY_AH) |
2115 (1ull << IB_USER_VERBS_CMD_REG_MR) |
2116 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
2117 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
2118 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
2119 (1ull << IB_USER_VERBS_CMD_RESIZE_CQ) |
2120 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
2121 (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
2122 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
2123 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
2124 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
2125 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
2126 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
2127 (1ull << IB_USER_VERBS_CMD_POST_SEND) |
2128 (1ull << IB_USER_VERBS_CMD_POST_RECV) |
2129 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
2130 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
2131 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
2132 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
2133 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ) |
2134 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ) |
2135 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
2136 dev->node_type = RDMA_NODE_IB_CA;
2137 dev->phys_port_cnt = 1;
2138 dev->num_comp_vectors = 1;
2139 dev->dma_device = &dd->pcidev->dev;
2140 dev->query_device = ipath_query_device;
2141 dev->modify_device = ipath_modify_device;
2142 dev->query_port = ipath_query_port;
2143 dev->modify_port = ipath_modify_port;
2144 dev->query_pkey = ipath_query_pkey;
2145 dev->query_gid = ipath_query_gid;
2146 dev->alloc_ucontext = ipath_alloc_ucontext;
2147 dev->dealloc_ucontext = ipath_dealloc_ucontext;
2148 dev->alloc_pd = ipath_alloc_pd;
2149 dev->dealloc_pd = ipath_dealloc_pd;
2150 dev->create_ah = ipath_create_ah;
2151 dev->destroy_ah = ipath_destroy_ah;
2152 dev->query_ah = ipath_query_ah;
2153 dev->create_srq = ipath_create_srq;
2154 dev->modify_srq = ipath_modify_srq;
2155 dev->query_srq = ipath_query_srq;
2156 dev->destroy_srq = ipath_destroy_srq;
2157 dev->create_qp = ipath_create_qp;
2158 dev->modify_qp = ipath_modify_qp;
2159 dev->query_qp = ipath_query_qp;
2160 dev->destroy_qp = ipath_destroy_qp;
2161 dev->post_send = ipath_post_send;
2162 dev->post_recv = ipath_post_receive;
2163 dev->post_srq_recv = ipath_post_srq_receive;
2164 dev->create_cq = ipath_create_cq;
2165 dev->destroy_cq = ipath_destroy_cq;
2166 dev->resize_cq = ipath_resize_cq;
2167 dev->poll_cq = ipath_poll_cq;
2168 dev->req_notify_cq = ipath_req_notify_cq;
2169 dev->get_dma_mr = ipath_get_dma_mr;
2170 dev->reg_phys_mr = ipath_reg_phys_mr;
2171 dev->reg_user_mr = ipath_reg_user_mr;
2172 dev->dereg_mr = ipath_dereg_mr;
2173 dev->alloc_fmr = ipath_alloc_fmr;
2174 dev->map_phys_fmr = ipath_map_phys_fmr;
2175 dev->unmap_fmr = ipath_unmap_fmr;
2176 dev->dealloc_fmr = ipath_dealloc_fmr;
2177 dev->attach_mcast = ipath_multicast_attach;
2178 dev->detach_mcast = ipath_multicast_detach;
2179 dev->process_mad = ipath_process_mad;
2180 dev->mmap = ipath_mmap;
2181 dev->dma_ops = &ipath_dma_mapping_ops;
2182
2183 snprintf(dev->node_desc, sizeof(dev->node_desc),
2184 IPATH_IDSTR " %s", init_utsname()->nodename);
2185
2186 ret = ib_register_device(dev, NULL);
2187 if (ret)
2188 goto err_reg;
2189
2190 if (ipath_verbs_register_sysfs(dev))
2191 goto err_class;
2192
2193 enable_timer(dd);
2194
2195 goto bail;
2196
2197 err_class:
2198 ib_unregister_device(dev);
2199 err_reg:
2200 kfree(idev->lk_table.table);
2201 err_lk:
2202 kfree(idev->qp_table.table);
2203 err_qp:
2204 kfree(idev->txreq_bufs);
2205 err_tx:
2206 ib_dealloc_device(dev);
2207 ipath_dev_err(dd, "cannot register verbs: %d!\n", -ret);
2208 idev = NULL;
2209
2210 bail:
2211 dd->verbs_dev = idev;
2212 return ret;
2213 }
2214
2215 void ipath_unregister_ib_device(struct ipath_ibdev *dev)
2216 {
2217 struct ib_device *ibdev = &dev->ibdev;
2218 u32 qps_inuse;
2219
2220 ib_unregister_device(ibdev);
2221
2222 disable_timer(dev->dd);
2223
2224 if (!list_empty(&dev->pending[0]) ||
2225 !list_empty(&dev->pending[1]) ||
2226 !list_empty(&dev->pending[2]))
2227 ipath_dev_err(dev->dd, "pending list not empty!\n");
2228 if (!list_empty(&dev->piowait))
2229 ipath_dev_err(dev->dd, "piowait list not empty!\n");
2230 if (!list_empty(&dev->rnrwait))
2231 ipath_dev_err(dev->dd, "rnrwait list not empty!\n");
2232 if (!ipath_mcast_tree_empty())
2233 ipath_dev_err(dev->dd, "multicast table memory leak!\n");
2234 /*
2235 * Note that ipath_unregister_ib_device() can be called before all
2236 * the QPs are destroyed!
2237 */
2238 qps_inuse = ipath_free_all_qps(&dev->qp_table);
2239 if (qps_inuse)
2240 ipath_dev_err(dev->dd, "QP memory leak! %u still in use\n",
2241 qps_inuse);
2242 kfree(dev->qp_table.table);
2243 kfree(dev->lk_table.table);
2244 kfree(dev->txreq_bufs);
2245 ib_dealloc_device(ibdev);
2246 }
2247
2248 static ssize_t show_rev(struct device *device, struct device_attribute *attr,
2249 char *buf)
2250 {
2251 struct ipath_ibdev *dev =
2252 container_of(device, struct ipath_ibdev, ibdev.dev);
2253
2254 return sprintf(buf, "%x\n", dev->dd->ipath_pcirev);
2255 }
2256
2257 static ssize_t show_hca(struct device *device, struct device_attribute *attr,
2258 char *buf)
2259 {
2260 struct ipath_ibdev *dev =
2261 container_of(device, struct ipath_ibdev, ibdev.dev);
2262 int ret;
2263
2264 ret = dev->dd->ipath_f_get_boardname(dev->dd, buf, 128);
2265 if (ret < 0)
2266 goto bail;
2267 strcat(buf, "\n");
2268 ret = strlen(buf);
2269
2270 bail:
2271 return ret;
2272 }
2273
2274 static ssize_t show_stats(struct device *device, struct device_attribute *attr,
2275 char *buf)
2276 {
2277 struct ipath_ibdev *dev =
2278 container_of(device, struct ipath_ibdev, ibdev.dev);
2279 int i;
2280 int len;
2281
2282 len = sprintf(buf,
2283 "RC resends %d\n"
2284 "RC no QACK %d\n"
2285 "RC ACKs %d\n"
2286 "RC SEQ NAKs %d\n"
2287 "RC RDMA seq %d\n"
2288 "RC RNR NAKs %d\n"
2289 "RC OTH NAKs %d\n"
2290 "RC timeouts %d\n"
2291 "RC RDMA dup %d\n"
2292 "piobuf wait %d\n"
2293 "unaligned %d\n"
2294 "PKT drops %d\n"
2295 "WQE errs %d\n",
2296 dev->n_rc_resends, dev->n_rc_qacks, dev->n_rc_acks,
2297 dev->n_seq_naks, dev->n_rdma_seq, dev->n_rnr_naks,
2298 dev->n_other_naks, dev->n_timeouts,
2299 dev->n_rdma_dup_busy, dev->n_piowait, dev->n_unaligned,
2300 dev->n_pkt_drops, dev->n_wqe_errs);
2301 for (i = 0; i < ARRAY_SIZE(dev->opstats); i++) {
2302 const struct ipath_opcode_stats *si = &dev->opstats[i];
2303
2304 if (!si->n_packets && !si->n_bytes)
2305 continue;
2306 len += sprintf(buf + len, "%02x %llu/%llu\n", i,
2307 (unsigned long long) si->n_packets,
2308 (unsigned long long) si->n_bytes);
2309 }
2310 return len;
2311 }
2312
2313 static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
2314 static DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
2315 static DEVICE_ATTR(board_id, S_IRUGO, show_hca, NULL);
2316 static DEVICE_ATTR(stats, S_IRUGO, show_stats, NULL);
2317
2318 static struct device_attribute *ipath_class_attributes[] = {
2319 &dev_attr_hw_rev,
2320 &dev_attr_hca_type,
2321 &dev_attr_board_id,
2322 &dev_attr_stats
2323 };
2324
2325 static int ipath_verbs_register_sysfs(struct ib_device *dev)
2326 {
2327 int i;
2328 int ret;
2329
2330 for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i)
2331 if (device_create_file(&dev->dev,
2332 ipath_class_attributes[i])) {
2333 ret = 1;
2334 goto bail;
2335 }
2336
2337 ret = 0;
2338
2339 bail:
2340 return ret;
2341 }