1 /*
2 * Copyright (c) 2006, 2007, 2008, 2009 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 <linux/spinlock.h>
35
36 #include "qib.h"
37 #include "qib_mad.h"
38
39 /*
40 * Convert the AETH RNR timeout code into the number of microseconds.
41 */
42 const u32 ib_qib_rnr_table[32] = {
43 655360, /* 00: 655.36 */
44 10, /* 01: .01 */
45 20, /* 02 .02 */
46 30, /* 03: .03 */
47 40, /* 04: .04 */
48 60, /* 05: .06 */
49 80, /* 06: .08 */
50 120, /* 07: .12 */
51 160, /* 08: .16 */
52 240, /* 09: .24 */
53 320, /* 0A: .32 */
54 480, /* 0B: .48 */
55 640, /* 0C: .64 */
56 960, /* 0D: .96 */
57 1280, /* 0E: 1.28 */
58 1920, /* 0F: 1.92 */
59 2560, /* 10: 2.56 */
60 3840, /* 11: 3.84 */
61 5120, /* 12: 5.12 */
62 7680, /* 13: 7.68 */
63 10240, /* 14: 10.24 */
64 15360, /* 15: 15.36 */
65 20480, /* 16: 20.48 */
66 30720, /* 17: 30.72 */
67 40960, /* 18: 40.96 */
68 61440, /* 19: 61.44 */
69 81920, /* 1A: 81.92 */
70 122880, /* 1B: 122.88 */
71 163840, /* 1C: 163.84 */
72 245760, /* 1D: 245.76 */
73 327680, /* 1E: 327.68 */
74 491520 /* 1F: 491.52 */
75 };
76
77 /*
78 * Validate a RWQE and fill in the SGE state.
79 * Return 1 if OK.
80 */
qib_init_sge(struct qib_qp * qp,struct qib_rwqe * wqe)81 static int qib_init_sge(struct qib_qp *qp, struct qib_rwqe *wqe)
82 {
83 int i, j, ret;
84 struct ib_wc wc;
85 struct qib_lkey_table *rkt;
86 struct qib_pd *pd;
87 struct qib_sge_state *ss;
88
89 rkt = &to_idev(qp->ibqp.device)->lk_table;
90 pd = to_ipd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd);
91 ss = &qp->r_sge;
92 ss->sg_list = qp->r_sg_list;
93 qp->r_len = 0;
94 for (i = j = 0; i < wqe->num_sge; i++) {
95 if (wqe->sg_list[i].length == 0)
96 continue;
97 /* Check LKEY */
98 if (!qib_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge,
99 &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE))
100 goto bad_lkey;
101 qp->r_len += wqe->sg_list[i].length;
102 j++;
103 }
104 ss->num_sge = j;
105 ss->total_len = qp->r_len;
106 ret = 1;
107 goto bail;
108
109 bad_lkey:
110 while (j) {
111 struct qib_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge;
112
113 atomic_dec(&sge->mr->refcount);
114 }
115 ss->num_sge = 0;
116 memset(&wc, 0, sizeof(wc));
117 wc.wr_id = wqe->wr_id;
118 wc.status = IB_WC_LOC_PROT_ERR;
119 wc.opcode = IB_WC_RECV;
120 wc.qp = &qp->ibqp;
121 /* Signal solicited completion event. */
122 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
123 ret = 0;
124 bail:
125 return ret;
126 }
127
128 /**
129 * qib_get_rwqe - copy the next RWQE into the QP's RWQE
130 * @qp: the QP
131 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge
132 *
133 * Return -1 if there is a local error, 0 if no RWQE is available,
134 * otherwise return 1.
135 *
136 * Can be called from interrupt level.
137 */
qib_get_rwqe(struct qib_qp * qp,int wr_id_only)138 int qib_get_rwqe(struct qib_qp *qp, int wr_id_only)
139 {
140 unsigned long flags;
141 struct qib_rq *rq;
142 struct qib_rwq *wq;
143 struct qib_srq *srq;
144 struct qib_rwqe *wqe;
145 void (*handler)(struct ib_event *, void *);
146 u32 tail;
147 int ret;
148
149 if (qp->ibqp.srq) {
150 srq = to_isrq(qp->ibqp.srq);
151 handler = srq->ibsrq.event_handler;
152 rq = &srq->rq;
153 } else {
154 srq = NULL;
155 handler = NULL;
156 rq = &qp->r_rq;
157 }
158
159 spin_lock_irqsave(&rq->lock, flags);
160 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) {
161 ret = 0;
162 goto unlock;
163 }
164
165 wq = rq->wq;
166 tail = wq->tail;
167 /* Validate tail before using it since it is user writable. */
168 if (tail >= rq->size)
169 tail = 0;
170 if (unlikely(tail == wq->head)) {
171 ret = 0;
172 goto unlock;
173 }
174 /* Make sure entry is read after head index is read. */
175 smp_rmb();
176 wqe = get_rwqe_ptr(rq, tail);
177 /*
178 * Even though we update the tail index in memory, the verbs
179 * consumer is not supposed to post more entries until a
180 * completion is generated.
181 */
182 if (++tail >= rq->size)
183 tail = 0;
184 wq->tail = tail;
185 if (!wr_id_only && !qib_init_sge(qp, wqe)) {
186 ret = -1;
187 goto unlock;
188 }
189 qp->r_wr_id = wqe->wr_id;
190
191 ret = 1;
192 set_bit(QIB_R_WRID_VALID, &qp->r_aflags);
193 if (handler) {
194 u32 n;
195
196 /*
197 * Validate head pointer value and compute
198 * the number of remaining WQEs.
199 */
200 n = wq->head;
201 if (n >= rq->size)
202 n = 0;
203 if (n < tail)
204 n += rq->size - tail;
205 else
206 n -= tail;
207 if (n < srq->limit) {
208 struct ib_event ev;
209
210 srq->limit = 0;
211 spin_unlock_irqrestore(&rq->lock, flags);
212 ev.device = qp->ibqp.device;
213 ev.element.srq = qp->ibqp.srq;
214 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
215 handler(&ev, srq->ibsrq.srq_context);
216 goto bail;
217 }
218 }
219 unlock:
220 spin_unlock_irqrestore(&rq->lock, flags);
221 bail:
222 return ret;
223 }
224
225 /*
226 * Switch to alternate path.
227 * The QP s_lock should be held and interrupts disabled.
228 */
qib_migrate_qp(struct qib_qp * qp)229 void qib_migrate_qp(struct qib_qp *qp)
230 {
231 struct ib_event ev;
232
233 qp->s_mig_state = IB_MIG_MIGRATED;
234 qp->remote_ah_attr = qp->alt_ah_attr;
235 qp->port_num = qp->alt_ah_attr.port_num;
236 qp->s_pkey_index = qp->s_alt_pkey_index;
237
238 ev.device = qp->ibqp.device;
239 ev.element.qp = &qp->ibqp;
240 ev.event = IB_EVENT_PATH_MIG;
241 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
242 }
243
get_sguid(struct qib_ibport * ibp,unsigned index)244 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
245 {
246 if (!index) {
247 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
248
249 return ppd->guid;
250 } else
251 return ibp->guids[index - 1];
252 }
253
gid_ok(union ib_gid * gid,__be64 gid_prefix,__be64 id)254 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
255 {
256 return (gid->global.interface_id == id &&
257 (gid->global.subnet_prefix == gid_prefix ||
258 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
259 }
260
261 /*
262 *
263 * This should be called with the QP s_lock held.
264 */
qib_ruc_check_hdr(struct qib_ibport * ibp,struct qib_ib_header * hdr,int has_grh,struct qib_qp * qp,u32 bth0)265 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr,
266 int has_grh, struct qib_qp *qp, u32 bth0)
267 {
268 __be64 guid;
269
270 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
271 if (!has_grh) {
272 if (qp->alt_ah_attr.ah_flags & IB_AH_GRH)
273 goto err;
274 } else {
275 if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH))
276 goto err;
277 guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index);
278 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid))
279 goto err;
280 if (!gid_ok(&hdr->u.l.grh.sgid,
281 qp->alt_ah_attr.grh.dgid.global.subnet_prefix,
282 qp->alt_ah_attr.grh.dgid.global.interface_id))
283 goto err;
284 }
285 if (!qib_pkey_ok((u16)bth0,
286 qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
287 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY,
288 (u16)bth0,
289 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
290 0, qp->ibqp.qp_num,
291 hdr->lrh[3], hdr->lrh[1]);
292 goto err;
293 }
294 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
295 if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid ||
296 ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num)
297 goto err;
298 qib_migrate_qp(qp);
299 } else {
300 if (!has_grh) {
301 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
302 goto err;
303 } else {
304 if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH))
305 goto err;
306 guid = get_sguid(ibp,
307 qp->remote_ah_attr.grh.sgid_index);
308 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid))
309 goto err;
310 if (!gid_ok(&hdr->u.l.grh.sgid,
311 qp->remote_ah_attr.grh.dgid.global.subnet_prefix,
312 qp->remote_ah_attr.grh.dgid.global.interface_id))
313 goto err;
314 }
315 if (!qib_pkey_ok((u16)bth0,
316 qib_get_pkey(ibp, qp->s_pkey_index))) {
317 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY,
318 (u16)bth0,
319 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
320 0, qp->ibqp.qp_num,
321 hdr->lrh[3], hdr->lrh[1]);
322 goto err;
323 }
324 /* Validate the SLID. See Ch. 9.6.1.5 */
325 if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid ||
326 ppd_from_ibp(ibp)->port != qp->port_num)
327 goto err;
328 if (qp->s_mig_state == IB_MIG_REARM &&
329 !(bth0 & IB_BTH_MIG_REQ))
330 qp->s_mig_state = IB_MIG_ARMED;
331 }
332
333 return 0;
334
335 err:
336 return 1;
337 }
338
339 /**
340 * qib_ruc_loopback - handle UC and RC lookback requests
341 * @sqp: the sending QP
342 *
343 * This is called from qib_do_send() to
344 * forward a WQE addressed to the same HCA.
345 * Note that although we are single threaded due to the tasklet, we still
346 * have to protect against post_send(). We don't have to worry about
347 * receive interrupts since this is a connected protocol and all packets
348 * will pass through here.
349 */
qib_ruc_loopback(struct qib_qp * sqp)350 static void qib_ruc_loopback(struct qib_qp *sqp)
351 {
352 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
353 struct qib_qp *qp;
354 struct qib_swqe *wqe;
355 struct qib_sge *sge;
356 unsigned long flags;
357 struct ib_wc wc;
358 u64 sdata;
359 atomic64_t *maddr;
360 enum ib_wc_status send_status;
361 int release;
362 int ret;
363
364 /*
365 * Note that we check the responder QP state after
366 * checking the requester's state.
367 */
368 qp = qib_lookup_qpn(ibp, sqp->remote_qpn);
369
370 spin_lock_irqsave(&sqp->s_lock, flags);
371
372 /* Return if we are already busy processing a work request. */
373 if ((sqp->s_flags & (QIB_S_BUSY | QIB_S_ANY_WAIT)) ||
374 !(ib_qib_state_ops[sqp->state] & QIB_PROCESS_OR_FLUSH_SEND))
375 goto unlock;
376
377 sqp->s_flags |= QIB_S_BUSY;
378
379 again:
380 if (sqp->s_last == sqp->s_head)
381 goto clr_busy;
382 wqe = get_swqe_ptr(sqp, sqp->s_last);
383
384 /* Return if it is not OK to start a new work reqeust. */
385 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_NEXT_SEND_OK)) {
386 if (!(ib_qib_state_ops[sqp->state] & QIB_FLUSH_SEND))
387 goto clr_busy;
388 /* We are in the error state, flush the work request. */
389 send_status = IB_WC_WR_FLUSH_ERR;
390 goto flush_send;
391 }
392
393 /*
394 * We can rely on the entry not changing without the s_lock
395 * being held until we update s_last.
396 * We increment s_cur to indicate s_last is in progress.
397 */
398 if (sqp->s_last == sqp->s_cur) {
399 if (++sqp->s_cur >= sqp->s_size)
400 sqp->s_cur = 0;
401 }
402 spin_unlock_irqrestore(&sqp->s_lock, flags);
403
404 if (!qp || !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) ||
405 qp->ibqp.qp_type != sqp->ibqp.qp_type) {
406 ibp->n_pkt_drops++;
407 /*
408 * For RC, the requester would timeout and retry so
409 * shortcut the timeouts and just signal too many retries.
410 */
411 if (sqp->ibqp.qp_type == IB_QPT_RC)
412 send_status = IB_WC_RETRY_EXC_ERR;
413 else
414 send_status = IB_WC_SUCCESS;
415 goto serr;
416 }
417
418 memset(&wc, 0, sizeof wc);
419 send_status = IB_WC_SUCCESS;
420
421 release = 1;
422 sqp->s_sge.sge = wqe->sg_list[0];
423 sqp->s_sge.sg_list = wqe->sg_list + 1;
424 sqp->s_sge.num_sge = wqe->wr.num_sge;
425 sqp->s_len = wqe->length;
426 switch (wqe->wr.opcode) {
427 case IB_WR_SEND_WITH_IMM:
428 wc.wc_flags = IB_WC_WITH_IMM;
429 wc.ex.imm_data = wqe->wr.ex.imm_data;
430 /* FALLTHROUGH */
431 case IB_WR_SEND:
432 ret = qib_get_rwqe(qp, 0);
433 if (ret < 0)
434 goto op_err;
435 if (!ret)
436 goto rnr_nak;
437 break;
438
439 case IB_WR_RDMA_WRITE_WITH_IMM:
440 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
441 goto inv_err;
442 wc.wc_flags = IB_WC_WITH_IMM;
443 wc.ex.imm_data = wqe->wr.ex.imm_data;
444 ret = qib_get_rwqe(qp, 1);
445 if (ret < 0)
446 goto op_err;
447 if (!ret)
448 goto rnr_nak;
449 /* FALLTHROUGH */
450 case IB_WR_RDMA_WRITE:
451 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
452 goto inv_err;
453 if (wqe->length == 0)
454 break;
455 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, wqe->length,
456 wqe->wr.wr.rdma.remote_addr,
457 wqe->wr.wr.rdma.rkey,
458 IB_ACCESS_REMOTE_WRITE)))
459 goto acc_err;
460 qp->r_sge.sg_list = NULL;
461 qp->r_sge.num_sge = 1;
462 qp->r_sge.total_len = wqe->length;
463 break;
464
465 case IB_WR_RDMA_READ:
466 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
467 goto inv_err;
468 if (unlikely(!qib_rkey_ok(qp, &sqp->s_sge.sge, wqe->length,
469 wqe->wr.wr.rdma.remote_addr,
470 wqe->wr.wr.rdma.rkey,
471 IB_ACCESS_REMOTE_READ)))
472 goto acc_err;
473 release = 0;
474 sqp->s_sge.sg_list = NULL;
475 sqp->s_sge.num_sge = 1;
476 qp->r_sge.sge = wqe->sg_list[0];
477 qp->r_sge.sg_list = wqe->sg_list + 1;
478 qp->r_sge.num_sge = wqe->wr.num_sge;
479 qp->r_sge.total_len = wqe->length;
480 break;
481
482 case IB_WR_ATOMIC_CMP_AND_SWP:
483 case IB_WR_ATOMIC_FETCH_AND_ADD:
484 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
485 goto inv_err;
486 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
487 wqe->wr.wr.atomic.remote_addr,
488 wqe->wr.wr.atomic.rkey,
489 IB_ACCESS_REMOTE_ATOMIC)))
490 goto acc_err;
491 /* Perform atomic OP and save result. */
492 maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
493 sdata = wqe->wr.wr.atomic.compare_add;
494 *(u64 *) sqp->s_sge.sge.vaddr =
495 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
496 (u64) atomic64_add_return(sdata, maddr) - sdata :
497 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
498 sdata, wqe->wr.wr.atomic.swap);
499 atomic_dec(&qp->r_sge.sge.mr->refcount);
500 qp->r_sge.num_sge = 0;
501 goto send_comp;
502
503 default:
504 send_status = IB_WC_LOC_QP_OP_ERR;
505 goto serr;
506 }
507
508 sge = &sqp->s_sge.sge;
509 while (sqp->s_len) {
510 u32 len = sqp->s_len;
511
512 if (len > sge->length)
513 len = sge->length;
514 if (len > sge->sge_length)
515 len = sge->sge_length;
516 BUG_ON(len == 0);
517 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release);
518 sge->vaddr += len;
519 sge->length -= len;
520 sge->sge_length -= len;
521 if (sge->sge_length == 0) {
522 if (!release)
523 atomic_dec(&sge->mr->refcount);
524 if (--sqp->s_sge.num_sge)
525 *sge = *sqp->s_sge.sg_list++;
526 } else if (sge->length == 0 && sge->mr->lkey) {
527 if (++sge->n >= QIB_SEGSZ) {
528 if (++sge->m >= sge->mr->mapsz)
529 break;
530 sge->n = 0;
531 }
532 sge->vaddr =
533 sge->mr->map[sge->m]->segs[sge->n].vaddr;
534 sge->length =
535 sge->mr->map[sge->m]->segs[sge->n].length;
536 }
537 sqp->s_len -= len;
538 }
539 if (release)
540 while (qp->r_sge.num_sge) {
541 atomic_dec(&qp->r_sge.sge.mr->refcount);
542 if (--qp->r_sge.num_sge)
543 qp->r_sge.sge = *qp->r_sge.sg_list++;
544 }
545
546 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags))
547 goto send_comp;
548
549 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
550 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
551 else
552 wc.opcode = IB_WC_RECV;
553 wc.wr_id = qp->r_wr_id;
554 wc.status = IB_WC_SUCCESS;
555 wc.byte_len = wqe->length;
556 wc.qp = &qp->ibqp;
557 wc.src_qp = qp->remote_qpn;
558 wc.slid = qp->remote_ah_attr.dlid;
559 wc.sl = qp->remote_ah_attr.sl;
560 wc.port_num = 1;
561 /* Signal completion event if the solicited bit is set. */
562 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
563 wqe->wr.send_flags & IB_SEND_SOLICITED);
564
565 send_comp:
566 spin_lock_irqsave(&sqp->s_lock, flags);
567 ibp->n_loop_pkts++;
568 flush_send:
569 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
570 qib_send_complete(sqp, wqe, send_status);
571 goto again;
572
573 rnr_nak:
574 /* Handle RNR NAK */
575 if (qp->ibqp.qp_type == IB_QPT_UC)
576 goto send_comp;
577 ibp->n_rnr_naks++;
578 /*
579 * Note: we don't need the s_lock held since the BUSY flag
580 * makes this single threaded.
581 */
582 if (sqp->s_rnr_retry == 0) {
583 send_status = IB_WC_RNR_RETRY_EXC_ERR;
584 goto serr;
585 }
586 if (sqp->s_rnr_retry_cnt < 7)
587 sqp->s_rnr_retry--;
588 spin_lock_irqsave(&sqp->s_lock, flags);
589 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_RECV_OK))
590 goto clr_busy;
591 sqp->s_flags |= QIB_S_WAIT_RNR;
592 sqp->s_timer.function = qib_rc_rnr_retry;
593 sqp->s_timer.expires = jiffies +
594 usecs_to_jiffies(ib_qib_rnr_table[qp->r_min_rnr_timer]);
595 add_timer(&sqp->s_timer);
596 goto clr_busy;
597
598 op_err:
599 send_status = IB_WC_REM_OP_ERR;
600 wc.status = IB_WC_LOC_QP_OP_ERR;
601 goto err;
602
603 inv_err:
604 send_status = IB_WC_REM_INV_REQ_ERR;
605 wc.status = IB_WC_LOC_QP_OP_ERR;
606 goto err;
607
608 acc_err:
609 send_status = IB_WC_REM_ACCESS_ERR;
610 wc.status = IB_WC_LOC_PROT_ERR;
611 err:
612 /* responder goes to error state */
613 qib_rc_error(qp, wc.status);
614
615 serr:
616 spin_lock_irqsave(&sqp->s_lock, flags);
617 qib_send_complete(sqp, wqe, send_status);
618 if (sqp->ibqp.qp_type == IB_QPT_RC) {
619 int lastwqe = qib_error_qp(sqp, IB_WC_WR_FLUSH_ERR);
620
621 sqp->s_flags &= ~QIB_S_BUSY;
622 spin_unlock_irqrestore(&sqp->s_lock, flags);
623 if (lastwqe) {
624 struct ib_event ev;
625
626 ev.device = sqp->ibqp.device;
627 ev.element.qp = &sqp->ibqp;
628 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
629 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context);
630 }
631 goto done;
632 }
633 clr_busy:
634 sqp->s_flags &= ~QIB_S_BUSY;
635 unlock:
636 spin_unlock_irqrestore(&sqp->s_lock, flags);
637 done:
638 if (qp && atomic_dec_and_test(&qp->refcount))
639 wake_up(&qp->wait);
640 }
641
642 /**
643 * qib_make_grh - construct a GRH header
644 * @ibp: a pointer to the IB port
645 * @hdr: a pointer to the GRH header being constructed
646 * @grh: the global route address to send to
647 * @hwords: the number of 32 bit words of header being sent
648 * @nwords: the number of 32 bit words of data being sent
649 *
650 * Return the size of the header in 32 bit words.
651 */
qib_make_grh(struct qib_ibport * ibp,struct ib_grh * hdr,struct ib_global_route * grh,u32 hwords,u32 nwords)652 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
653 struct ib_global_route *grh, u32 hwords, u32 nwords)
654 {
655 hdr->version_tclass_flow =
656 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
657 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
658 (grh->flow_label << IB_GRH_FLOW_SHIFT));
659 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
660 /* next_hdr is defined by C8-7 in ch. 8.4.1 */
661 hdr->next_hdr = IB_GRH_NEXT_HDR;
662 hdr->hop_limit = grh->hop_limit;
663 /* The SGID is 32-bit aligned. */
664 hdr->sgid.global.subnet_prefix = ibp->gid_prefix;
665 hdr->sgid.global.interface_id = grh->sgid_index ?
666 ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid;
667 hdr->dgid = grh->dgid;
668
669 /* GRH header size in 32-bit words. */
670 return sizeof(struct ib_grh) / sizeof(u32);
671 }
672
qib_make_ruc_header(struct qib_qp * qp,struct qib_other_headers * ohdr,u32 bth0,u32 bth2)673 void qib_make_ruc_header(struct qib_qp *qp, struct qib_other_headers *ohdr,
674 u32 bth0, u32 bth2)
675 {
676 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
677 u16 lrh0;
678 u32 nwords;
679 u32 extra_bytes;
680
681 /* Construct the header. */
682 extra_bytes = -qp->s_cur_size & 3;
683 nwords = (qp->s_cur_size + extra_bytes) >> 2;
684 lrh0 = QIB_LRH_BTH;
685 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
686 qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr.u.l.grh,
687 &qp->remote_ah_attr.grh,
688 qp->s_hdrwords, nwords);
689 lrh0 = QIB_LRH_GRH;
690 }
691 lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 |
692 qp->remote_ah_attr.sl << 4;
693 qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
694 qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
695 qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
696 qp->s_hdr.lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid |
697 qp->remote_ah_attr.src_path_bits);
698 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
699 bth0 |= extra_bytes << 20;
700 if (qp->s_mig_state == IB_MIG_MIGRATED)
701 bth0 |= IB_BTH_MIG_REQ;
702 ohdr->bth[0] = cpu_to_be32(bth0);
703 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
704 ohdr->bth[2] = cpu_to_be32(bth2);
705 }
706
707 /**
708 * qib_do_send - perform a send on a QP
709 * @work: contains a pointer to the QP
710 *
711 * Process entries in the send work queue until credit or queue is
712 * exhausted. Only allow one CPU to send a packet per QP (tasklet).
713 * Otherwise, two threads could send packets out of order.
714 */
qib_do_send(struct work_struct * work)715 void qib_do_send(struct work_struct *work)
716 {
717 struct qib_qp *qp = container_of(work, struct qib_qp, s_work);
718 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
719 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
720 int (*make_req)(struct qib_qp *qp);
721 unsigned long flags;
722
723 if ((qp->ibqp.qp_type == IB_QPT_RC ||
724 qp->ibqp.qp_type == IB_QPT_UC) &&
725 (qp->remote_ah_attr.dlid & ~((1 << ppd->lmc) - 1)) == ppd->lid) {
726 qib_ruc_loopback(qp);
727 return;
728 }
729
730 if (qp->ibqp.qp_type == IB_QPT_RC)
731 make_req = qib_make_rc_req;
732 else if (qp->ibqp.qp_type == IB_QPT_UC)
733 make_req = qib_make_uc_req;
734 else
735 make_req = qib_make_ud_req;
736
737 spin_lock_irqsave(&qp->s_lock, flags);
738
739 /* Return if we are already busy processing a work request. */
740 if (!qib_send_ok(qp)) {
741 spin_unlock_irqrestore(&qp->s_lock, flags);
742 return;
743 }
744
745 qp->s_flags |= QIB_S_BUSY;
746
747 spin_unlock_irqrestore(&qp->s_lock, flags);
748
749 do {
750 /* Check for a constructed packet to be sent. */
751 if (qp->s_hdrwords != 0) {
752 /*
753 * If the packet cannot be sent now, return and
754 * the send tasklet will be woken up later.
755 */
756 if (qib_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords,
757 qp->s_cur_sge, qp->s_cur_size))
758 break;
759 /* Record that s_hdr is empty. */
760 qp->s_hdrwords = 0;
761 }
762 } while (make_req(qp));
763 }
764
765 /*
766 * This should be called with s_lock held.
767 */
qib_send_complete(struct qib_qp * qp,struct qib_swqe * wqe,enum ib_wc_status status)768 void qib_send_complete(struct qib_qp *qp, struct qib_swqe *wqe,
769 enum ib_wc_status status)
770 {
771 u32 old_last, last;
772 unsigned i;
773
774 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND))
775 return;
776
777 for (i = 0; i < wqe->wr.num_sge; i++) {
778 struct qib_sge *sge = &wqe->sg_list[i];
779
780 atomic_dec(&sge->mr->refcount);
781 }
782 if (qp->ibqp.qp_type == IB_QPT_UD ||
783 qp->ibqp.qp_type == IB_QPT_SMI ||
784 qp->ibqp.qp_type == IB_QPT_GSI)
785 atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount);
786
787 /* See ch. 11.2.4.1 and 10.7.3.1 */
788 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) ||
789 (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
790 status != IB_WC_SUCCESS) {
791 struct ib_wc wc;
792
793 memset(&wc, 0, sizeof wc);
794 wc.wr_id = wqe->wr.wr_id;
795 wc.status = status;
796 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode];
797 wc.qp = &qp->ibqp;
798 if (status == IB_WC_SUCCESS)
799 wc.byte_len = wqe->length;
800 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc,
801 status != IB_WC_SUCCESS);
802 }
803
804 last = qp->s_last;
805 old_last = last;
806 if (++last >= qp->s_size)
807 last = 0;
808 qp->s_last = last;
809 if (qp->s_acked == old_last)
810 qp->s_acked = last;
811 if (qp->s_cur == old_last)
812 qp->s_cur = last;
813 if (qp->s_tail == old_last)
814 qp->s_tail = last;
815 if (qp->state == IB_QPS_SQD && last == qp->s_cur)
816 qp->s_draining = 0;
817 }
818