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Merge commit 'c104f1fa1ecf4ee0fc06e31b1f77630b2551be81' into stable/for-linus-3.4
[mirror_ubuntu-bionic-kernel.git] / drivers / infiniband / hw / ehca / ehca_reqs.c
1 /*
2 * IBM eServer eHCA Infiniband device driver for Linux on POWER
3 *
4 * post_send/recv, poll_cq, req_notify
5 *
6 * Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
7 * Waleri Fomin <fomin@de.ibm.com>
8 * Joachim Fenkes <fenkes@de.ibm.com>
9 * Reinhard Ernst <rernst@de.ibm.com>
10 *
11 * Copyright (c) 2005 IBM Corporation
12 *
13 * All rights reserved.
14 *
15 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
16 * BSD.
17 *
18 * OpenIB BSD License
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions are met:
22 *
23 * Redistributions of source code must retain the above copyright notice, this
24 * list of conditions and the following disclaimer.
25 *
26 * Redistributions in binary form must reproduce the above copyright notice,
27 * this list of conditions and the following disclaimer in the documentation
28 * and/or other materials
29 * provided with the distribution.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
32 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
35 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
36 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
37 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
38 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
39 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGE.
42 */
43
44
45 #include "ehca_classes.h"
46 #include "ehca_tools.h"
47 #include "ehca_qes.h"
48 #include "ehca_iverbs.h"
49 #include "hcp_if.h"
50 #include "hipz_fns.h"
51
52 /* in RC traffic, insert an empty RDMA READ every this many packets */
53 #define ACK_CIRC_THRESHOLD 2000000
54
55 static u64 replace_wr_id(u64 wr_id, u16 idx)
56 {
57 u64 ret;
58
59 ret = wr_id & ~QMAP_IDX_MASK;
60 ret |= idx & QMAP_IDX_MASK;
61
62 return ret;
63 }
64
65 static u16 get_app_wr_id(u64 wr_id)
66 {
67 return wr_id & QMAP_IDX_MASK;
68 }
69
70 static inline int ehca_write_rwqe(struct ipz_queue *ipz_rqueue,
71 struct ehca_wqe *wqe_p,
72 struct ib_recv_wr *recv_wr,
73 u32 rq_map_idx)
74 {
75 u8 cnt_ds;
76 if (unlikely((recv_wr->num_sge < 0) ||
77 (recv_wr->num_sge > ipz_rqueue->act_nr_of_sg))) {
78 ehca_gen_err("Invalid number of WQE SGE. "
79 "num_sqe=%x max_nr_of_sg=%x",
80 recv_wr->num_sge, ipz_rqueue->act_nr_of_sg);
81 return -EINVAL; /* invalid SG list length */
82 }
83
84 /* clear wqe header until sglist */
85 memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
86
87 wqe_p->work_request_id = replace_wr_id(recv_wr->wr_id, rq_map_idx);
88 wqe_p->nr_of_data_seg = recv_wr->num_sge;
89
90 for (cnt_ds = 0; cnt_ds < recv_wr->num_sge; cnt_ds++) {
91 wqe_p->u.all_rcv.sg_list[cnt_ds].vaddr =
92 recv_wr->sg_list[cnt_ds].addr;
93 wqe_p->u.all_rcv.sg_list[cnt_ds].lkey =
94 recv_wr->sg_list[cnt_ds].lkey;
95 wqe_p->u.all_rcv.sg_list[cnt_ds].length =
96 recv_wr->sg_list[cnt_ds].length;
97 }
98
99 if (ehca_debug_level >= 3) {
100 ehca_gen_dbg("RECEIVE WQE written into ipz_rqueue=%p",
101 ipz_rqueue);
102 ehca_dmp(wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "recv wqe");
103 }
104
105 return 0;
106 }
107
108 #if defined(DEBUG_GSI_SEND_WR)
109
110 /* need ib_mad struct */
111 #include <rdma/ib_mad.h>
112
113 static void trace_send_wr_ud(const struct ib_send_wr *send_wr)
114 {
115 int idx;
116 int j;
117 while (send_wr) {
118 struct ib_mad_hdr *mad_hdr = send_wr->wr.ud.mad_hdr;
119 struct ib_sge *sge = send_wr->sg_list;
120 ehca_gen_dbg("send_wr#%x wr_id=%lx num_sge=%x "
121 "send_flags=%x opcode=%x", idx, send_wr->wr_id,
122 send_wr->num_sge, send_wr->send_flags,
123 send_wr->opcode);
124 if (mad_hdr) {
125 ehca_gen_dbg("send_wr#%x mad_hdr base_version=%x "
126 "mgmt_class=%x class_version=%x method=%x "
127 "status=%x class_specific=%x tid=%lx "
128 "attr_id=%x resv=%x attr_mod=%x",
129 idx, mad_hdr->base_version,
130 mad_hdr->mgmt_class,
131 mad_hdr->class_version, mad_hdr->method,
132 mad_hdr->status, mad_hdr->class_specific,
133 mad_hdr->tid, mad_hdr->attr_id,
134 mad_hdr->resv,
135 mad_hdr->attr_mod);
136 }
137 for (j = 0; j < send_wr->num_sge; j++) {
138 u8 *data = (u8 *)abs_to_virt(sge->addr);
139 ehca_gen_dbg("send_wr#%x sge#%x addr=%p length=%x "
140 "lkey=%x",
141 idx, j, data, sge->length, sge->lkey);
142 /* assume length is n*16 */
143 ehca_dmp(data, sge->length, "send_wr#%x sge#%x",
144 idx, j);
145 sge++;
146 } /* eof for j */
147 idx++;
148 send_wr = send_wr->next;
149 } /* eof while send_wr */
150 }
151
152 #endif /* DEBUG_GSI_SEND_WR */
153
154 static inline int ehca_write_swqe(struct ehca_qp *qp,
155 struct ehca_wqe *wqe_p,
156 const struct ib_send_wr *send_wr,
157 u32 sq_map_idx,
158 int hidden)
159 {
160 u32 idx;
161 u64 dma_length;
162 struct ehca_av *my_av;
163 u32 remote_qkey = send_wr->wr.ud.remote_qkey;
164 struct ehca_qmap_entry *qmap_entry = &qp->sq_map.map[sq_map_idx];
165
166 if (unlikely((send_wr->num_sge < 0) ||
167 (send_wr->num_sge > qp->ipz_squeue.act_nr_of_sg))) {
168 ehca_gen_err("Invalid number of WQE SGE. "
169 "num_sqe=%x max_nr_of_sg=%x",
170 send_wr->num_sge, qp->ipz_squeue.act_nr_of_sg);
171 return -EINVAL; /* invalid SG list length */
172 }
173
174 /* clear wqe header until sglist */
175 memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
176
177 wqe_p->work_request_id = replace_wr_id(send_wr->wr_id, sq_map_idx);
178
179 qmap_entry->app_wr_id = get_app_wr_id(send_wr->wr_id);
180 qmap_entry->reported = 0;
181 qmap_entry->cqe_req = 0;
182
183 switch (send_wr->opcode) {
184 case IB_WR_SEND:
185 case IB_WR_SEND_WITH_IMM:
186 wqe_p->optype = WQE_OPTYPE_SEND;
187 break;
188 case IB_WR_RDMA_WRITE:
189 case IB_WR_RDMA_WRITE_WITH_IMM:
190 wqe_p->optype = WQE_OPTYPE_RDMAWRITE;
191 break;
192 case IB_WR_RDMA_READ:
193 wqe_p->optype = WQE_OPTYPE_RDMAREAD;
194 break;
195 default:
196 ehca_gen_err("Invalid opcode=%x", send_wr->opcode);
197 return -EINVAL; /* invalid opcode */
198 }
199
200 wqe_p->wqef = (send_wr->opcode) & WQEF_HIGH_NIBBLE;
201
202 wqe_p->wr_flag = 0;
203
204 if ((send_wr->send_flags & IB_SEND_SIGNALED ||
205 qp->init_attr.sq_sig_type == IB_SIGNAL_ALL_WR)
206 && !hidden) {
207 wqe_p->wr_flag |= WQE_WRFLAG_REQ_SIGNAL_COM;
208 qmap_entry->cqe_req = 1;
209 }
210
211 if (send_wr->opcode == IB_WR_SEND_WITH_IMM ||
212 send_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
213 /* this might not work as long as HW does not support it */
214 wqe_p->immediate_data = be32_to_cpu(send_wr->ex.imm_data);
215 wqe_p->wr_flag |= WQE_WRFLAG_IMM_DATA_PRESENT;
216 }
217
218 wqe_p->nr_of_data_seg = send_wr->num_sge;
219
220 switch (qp->qp_type) {
221 case IB_QPT_SMI:
222 case IB_QPT_GSI:
223 /* no break is intential here */
224 case IB_QPT_UD:
225 /* IB 1.2 spec C10-15 compliance */
226 if (send_wr->wr.ud.remote_qkey & 0x80000000)
227 remote_qkey = qp->qkey;
228
229 wqe_p->destination_qp_number = send_wr->wr.ud.remote_qpn << 8;
230 wqe_p->local_ee_context_qkey = remote_qkey;
231 if (unlikely(!send_wr->wr.ud.ah)) {
232 ehca_gen_err("wr.ud.ah is NULL. qp=%p", qp);
233 return -EINVAL;
234 }
235 if (unlikely(send_wr->wr.ud.remote_qpn == 0)) {
236 ehca_gen_err("dest QP# is 0. qp=%x", qp->real_qp_num);
237 return -EINVAL;
238 }
239 my_av = container_of(send_wr->wr.ud.ah, struct ehca_av, ib_ah);
240 wqe_p->u.ud_av.ud_av = my_av->av;
241
242 /*
243 * omitted check of IB_SEND_INLINE
244 * since HW does not support it
245 */
246 for (idx = 0; idx < send_wr->num_sge; idx++) {
247 wqe_p->u.ud_av.sg_list[idx].vaddr =
248 send_wr->sg_list[idx].addr;
249 wqe_p->u.ud_av.sg_list[idx].lkey =
250 send_wr->sg_list[idx].lkey;
251 wqe_p->u.ud_av.sg_list[idx].length =
252 send_wr->sg_list[idx].length;
253 } /* eof for idx */
254 if (qp->qp_type == IB_QPT_SMI ||
255 qp->qp_type == IB_QPT_GSI)
256 wqe_p->u.ud_av.ud_av.pmtu = 1;
257 if (qp->qp_type == IB_QPT_GSI) {
258 wqe_p->pkeyi = send_wr->wr.ud.pkey_index;
259 #ifdef DEBUG_GSI_SEND_WR
260 trace_send_wr_ud(send_wr);
261 #endif /* DEBUG_GSI_SEND_WR */
262 }
263 break;
264
265 case IB_QPT_UC:
266 if (send_wr->send_flags & IB_SEND_FENCE)
267 wqe_p->wr_flag |= WQE_WRFLAG_FENCE;
268 /* no break is intentional here */
269 case IB_QPT_RC:
270 /* TODO: atomic not implemented */
271 wqe_p->u.nud.remote_virtual_address =
272 send_wr->wr.rdma.remote_addr;
273 wqe_p->u.nud.rkey = send_wr->wr.rdma.rkey;
274
275 /*
276 * omitted checking of IB_SEND_INLINE
277 * since HW does not support it
278 */
279 dma_length = 0;
280 for (idx = 0; idx < send_wr->num_sge; idx++) {
281 wqe_p->u.nud.sg_list[idx].vaddr =
282 send_wr->sg_list[idx].addr;
283 wqe_p->u.nud.sg_list[idx].lkey =
284 send_wr->sg_list[idx].lkey;
285 wqe_p->u.nud.sg_list[idx].length =
286 send_wr->sg_list[idx].length;
287 dma_length += send_wr->sg_list[idx].length;
288 } /* eof idx */
289 wqe_p->u.nud.atomic_1st_op_dma_len = dma_length;
290
291 /* unsolicited ack circumvention */
292 if (send_wr->opcode == IB_WR_RDMA_READ) {
293 /* on RDMA read, switch on and reset counters */
294 qp->message_count = qp->packet_count = 0;
295 qp->unsol_ack_circ = 1;
296 } else
297 /* else estimate #packets */
298 qp->packet_count += (dma_length >> qp->mtu_shift) + 1;
299
300 break;
301
302 default:
303 ehca_gen_err("Invalid qptype=%x", qp->qp_type);
304 return -EINVAL;
305 }
306
307 if (ehca_debug_level >= 3) {
308 ehca_gen_dbg("SEND WQE written into queue qp=%p ", qp);
309 ehca_dmp( wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "send wqe");
310 }
311 return 0;
312 }
313
314 /* map_ib_wc_status converts raw cqe_status to ib_wc_status */
315 static inline void map_ib_wc_status(u32 cqe_status,
316 enum ib_wc_status *wc_status)
317 {
318 if (unlikely(cqe_status & WC_STATUS_ERROR_BIT)) {
319 switch (cqe_status & 0x3F) {
320 case 0x01:
321 case 0x21:
322 *wc_status = IB_WC_LOC_LEN_ERR;
323 break;
324 case 0x02:
325 case 0x22:
326 *wc_status = IB_WC_LOC_QP_OP_ERR;
327 break;
328 case 0x03:
329 case 0x23:
330 *wc_status = IB_WC_LOC_EEC_OP_ERR;
331 break;
332 case 0x04:
333 case 0x24:
334 *wc_status = IB_WC_LOC_PROT_ERR;
335 break;
336 case 0x05:
337 case 0x25:
338 *wc_status = IB_WC_WR_FLUSH_ERR;
339 break;
340 case 0x06:
341 *wc_status = IB_WC_MW_BIND_ERR;
342 break;
343 case 0x07: /* remote error - look into bits 20:24 */
344 switch ((cqe_status
345 & WC_STATUS_REMOTE_ERROR_FLAGS) >> 11) {
346 case 0x0:
347 /*
348 * PSN Sequence Error!
349 * couldn't find a matching status!
350 */
351 *wc_status = IB_WC_GENERAL_ERR;
352 break;
353 case 0x1:
354 *wc_status = IB_WC_REM_INV_REQ_ERR;
355 break;
356 case 0x2:
357 *wc_status = IB_WC_REM_ACCESS_ERR;
358 break;
359 case 0x3:
360 *wc_status = IB_WC_REM_OP_ERR;
361 break;
362 case 0x4:
363 *wc_status = IB_WC_REM_INV_RD_REQ_ERR;
364 break;
365 }
366 break;
367 case 0x08:
368 *wc_status = IB_WC_RETRY_EXC_ERR;
369 break;
370 case 0x09:
371 *wc_status = IB_WC_RNR_RETRY_EXC_ERR;
372 break;
373 case 0x0A:
374 case 0x2D:
375 *wc_status = IB_WC_REM_ABORT_ERR;
376 break;
377 case 0x0B:
378 case 0x2E:
379 *wc_status = IB_WC_INV_EECN_ERR;
380 break;
381 case 0x0C:
382 case 0x2F:
383 *wc_status = IB_WC_INV_EEC_STATE_ERR;
384 break;
385 case 0x0D:
386 *wc_status = IB_WC_BAD_RESP_ERR;
387 break;
388 case 0x10:
389 /* WQE purged */
390 *wc_status = IB_WC_WR_FLUSH_ERR;
391 break;
392 default:
393 *wc_status = IB_WC_FATAL_ERR;
394
395 }
396 } else
397 *wc_status = IB_WC_SUCCESS;
398 }
399
400 static inline int post_one_send(struct ehca_qp *my_qp,
401 struct ib_send_wr *cur_send_wr,
402 int hidden)
403 {
404 struct ehca_wqe *wqe_p;
405 int ret;
406 u32 sq_map_idx;
407 u64 start_offset = my_qp->ipz_squeue.current_q_offset;
408
409 /* get pointer next to free WQE */
410 wqe_p = ipz_qeit_get_inc(&my_qp->ipz_squeue);
411 if (unlikely(!wqe_p)) {
412 /* too many posted work requests: queue overflow */
413 ehca_err(my_qp->ib_qp.device, "Too many posted WQEs "
414 "qp_num=%x", my_qp->ib_qp.qp_num);
415 return -ENOMEM;
416 }
417
418 /*
419 * Get the index of the WQE in the send queue. The same index is used
420 * for writing into the sq_map.
421 */
422 sq_map_idx = start_offset / my_qp->ipz_squeue.qe_size;
423
424 /* write a SEND WQE into the QUEUE */
425 ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, sq_map_idx, hidden);
426 /*
427 * if something failed,
428 * reset the free entry pointer to the start value
429 */
430 if (unlikely(ret)) {
431 my_qp->ipz_squeue.current_q_offset = start_offset;
432 ehca_err(my_qp->ib_qp.device, "Could not write WQE "
433 "qp_num=%x", my_qp->ib_qp.qp_num);
434 return -EINVAL;
435 }
436
437 return 0;
438 }
439
440 int ehca_post_send(struct ib_qp *qp,
441 struct ib_send_wr *send_wr,
442 struct ib_send_wr **bad_send_wr)
443 {
444 struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
445 int wqe_cnt = 0;
446 int ret = 0;
447 unsigned long flags;
448
449 /* Reject WR if QP is in RESET, INIT or RTR state */
450 if (unlikely(my_qp->state < IB_QPS_RTS)) {
451 ehca_err(qp->device, "Invalid QP state qp_state=%d qpn=%x",
452 my_qp->state, qp->qp_num);
453 ret = -EINVAL;
454 goto out;
455 }
456
457 /* LOCK the QUEUE */
458 spin_lock_irqsave(&my_qp->spinlock_s, flags);
459
460 /* Send an empty extra RDMA read if:
461 * 1) there has been an RDMA read on this connection before
462 * 2) no RDMA read occurred for ACK_CIRC_THRESHOLD link packets
463 * 3) we can be sure that any previous extra RDMA read has been
464 * processed so we don't overflow the SQ
465 */
466 if (unlikely(my_qp->unsol_ack_circ &&
467 my_qp->packet_count > ACK_CIRC_THRESHOLD &&
468 my_qp->message_count > my_qp->init_attr.cap.max_send_wr)) {
469 /* insert an empty RDMA READ to fix up the remote QP state */
470 struct ib_send_wr circ_wr;
471 memset(&circ_wr, 0, sizeof(circ_wr));
472 circ_wr.opcode = IB_WR_RDMA_READ;
473 post_one_send(my_qp, &circ_wr, 1); /* ignore retcode */
474 wqe_cnt++;
475 ehca_dbg(qp->device, "posted circ wr qp_num=%x", qp->qp_num);
476 my_qp->message_count = my_qp->packet_count = 0;
477 }
478
479 /* loop processes list of send reqs */
480 while (send_wr) {
481 ret = post_one_send(my_qp, send_wr, 0);
482 if (unlikely(ret)) {
483 goto post_send_exit0;
484 }
485 wqe_cnt++;
486 send_wr = send_wr->next;
487 }
488
489 post_send_exit0:
490 iosync(); /* serialize GAL register access */
491 hipz_update_sqa(my_qp, wqe_cnt);
492 if (unlikely(ret || ehca_debug_level >= 2))
493 ehca_dbg(qp->device, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
494 my_qp, qp->qp_num, wqe_cnt, ret);
495 my_qp->message_count += wqe_cnt;
496 spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
497
498 out:
499 if (ret)
500 *bad_send_wr = send_wr;
501 return ret;
502 }
503
504 static int internal_post_recv(struct ehca_qp *my_qp,
505 struct ib_device *dev,
506 struct ib_recv_wr *recv_wr,
507 struct ib_recv_wr **bad_recv_wr)
508 {
509 struct ehca_wqe *wqe_p;
510 int wqe_cnt = 0;
511 int ret = 0;
512 u32 rq_map_idx;
513 unsigned long flags;
514 struct ehca_qmap_entry *qmap_entry;
515
516 if (unlikely(!HAS_RQ(my_qp))) {
517 ehca_err(dev, "QP has no RQ ehca_qp=%p qp_num=%x ext_type=%d",
518 my_qp, my_qp->real_qp_num, my_qp->ext_type);
519 ret = -ENODEV;
520 goto out;
521 }
522
523 /* LOCK the QUEUE */
524 spin_lock_irqsave(&my_qp->spinlock_r, flags);
525
526 /* loop processes list of recv reqs */
527 while (recv_wr) {
528 u64 start_offset = my_qp->ipz_rqueue.current_q_offset;
529 /* get pointer next to free WQE */
530 wqe_p = ipz_qeit_get_inc(&my_qp->ipz_rqueue);
531 if (unlikely(!wqe_p)) {
532 /* too many posted work requests: queue overflow */
533 ret = -ENOMEM;
534 ehca_err(dev, "Too many posted WQEs "
535 "qp_num=%x", my_qp->real_qp_num);
536 goto post_recv_exit0;
537 }
538 /*
539 * Get the index of the WQE in the recv queue. The same index
540 * is used for writing into the rq_map.
541 */
542 rq_map_idx = start_offset / my_qp->ipz_rqueue.qe_size;
543
544 /* write a RECV WQE into the QUEUE */
545 ret = ehca_write_rwqe(&my_qp->ipz_rqueue, wqe_p, recv_wr,
546 rq_map_idx);
547 /*
548 * if something failed,
549 * reset the free entry pointer to the start value
550 */
551 if (unlikely(ret)) {
552 my_qp->ipz_rqueue.current_q_offset = start_offset;
553 ret = -EINVAL;
554 ehca_err(dev, "Could not write WQE "
555 "qp_num=%x", my_qp->real_qp_num);
556 goto post_recv_exit0;
557 }
558
559 qmap_entry = &my_qp->rq_map.map[rq_map_idx];
560 qmap_entry->app_wr_id = get_app_wr_id(recv_wr->wr_id);
561 qmap_entry->reported = 0;
562 qmap_entry->cqe_req = 1;
563
564 wqe_cnt++;
565 recv_wr = recv_wr->next;
566 } /* eof for recv_wr */
567
568 post_recv_exit0:
569 iosync(); /* serialize GAL register access */
570 hipz_update_rqa(my_qp, wqe_cnt);
571 if (unlikely(ret || ehca_debug_level >= 2))
572 ehca_dbg(dev, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
573 my_qp, my_qp->real_qp_num, wqe_cnt, ret);
574 spin_unlock_irqrestore(&my_qp->spinlock_r, flags);
575
576 out:
577 if (ret)
578 *bad_recv_wr = recv_wr;
579
580 return ret;
581 }
582
583 int ehca_post_recv(struct ib_qp *qp,
584 struct ib_recv_wr *recv_wr,
585 struct ib_recv_wr **bad_recv_wr)
586 {
587 struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
588
589 /* Reject WR if QP is in RESET state */
590 if (unlikely(my_qp->state == IB_QPS_RESET)) {
591 ehca_err(qp->device, "Invalid QP state qp_state=%d qpn=%x",
592 my_qp->state, qp->qp_num);
593 *bad_recv_wr = recv_wr;
594 return -EINVAL;
595 }
596
597 return internal_post_recv(my_qp, qp->device, recv_wr, bad_recv_wr);
598 }
599
600 int ehca_post_srq_recv(struct ib_srq *srq,
601 struct ib_recv_wr *recv_wr,
602 struct ib_recv_wr **bad_recv_wr)
603 {
604 return internal_post_recv(container_of(srq, struct ehca_qp, ib_srq),
605 srq->device, recv_wr, bad_recv_wr);
606 }
607
608 /*
609 * ib_wc_opcode table converts ehca wc opcode to ib
610 * Since we use zero to indicate invalid opcode, the actual ib opcode must
611 * be decremented!!!
612 */
613 static const u8 ib_wc_opcode[255] = {
614 [0x01] = IB_WC_RECV+1,
615 [0x02] = IB_WC_RECV_RDMA_WITH_IMM+1,
616 [0x04] = IB_WC_BIND_MW+1,
617 [0x08] = IB_WC_FETCH_ADD+1,
618 [0x10] = IB_WC_COMP_SWAP+1,
619 [0x20] = IB_WC_RDMA_WRITE+1,
620 [0x40] = IB_WC_RDMA_READ+1,
621 [0x80] = IB_WC_SEND+1
622 };
623
624 /* internal function to poll one entry of cq */
625 static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
626 {
627 int ret = 0, qmap_tail_idx;
628 struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
629 struct ehca_cqe *cqe;
630 struct ehca_qp *my_qp;
631 struct ehca_qmap_entry *qmap_entry;
632 struct ehca_queue_map *qmap;
633 int cqe_count = 0, is_error;
634
635 repoll:
636 cqe = (struct ehca_cqe *)
637 ipz_qeit_get_inc_valid(&my_cq->ipz_queue);
638 if (!cqe) {
639 ret = -EAGAIN;
640 if (ehca_debug_level >= 3)
641 ehca_dbg(cq->device, "Completion queue is empty "
642 "my_cq=%p cq_num=%x", my_cq, my_cq->cq_number);
643 goto poll_cq_one_exit0;
644 }
645
646 /* prevents loads being reordered across this point */
647 rmb();
648
649 cqe_count++;
650 if (unlikely(cqe->status & WC_STATUS_PURGE_BIT)) {
651 struct ehca_qp *qp;
652 int purgeflag;
653 unsigned long flags;
654
655 qp = ehca_cq_get_qp(my_cq, cqe->local_qp_number);
656 if (!qp) {
657 ehca_err(cq->device, "cq_num=%x qp_num=%x "
658 "could not find qp -> ignore cqe",
659 my_cq->cq_number, cqe->local_qp_number);
660 ehca_dmp(cqe, 64, "cq_num=%x qp_num=%x",
661 my_cq->cq_number, cqe->local_qp_number);
662 /* ignore this purged cqe */
663 goto repoll;
664 }
665 spin_lock_irqsave(&qp->spinlock_s, flags);
666 purgeflag = qp->sqerr_purgeflag;
667 spin_unlock_irqrestore(&qp->spinlock_s, flags);
668
669 if (purgeflag) {
670 ehca_dbg(cq->device,
671 "Got CQE with purged bit qp_num=%x src_qp=%x",
672 cqe->local_qp_number, cqe->remote_qp_number);
673 if (ehca_debug_level >= 2)
674 ehca_dmp(cqe, 64, "qp_num=%x src_qp=%x",
675 cqe->local_qp_number,
676 cqe->remote_qp_number);
677 /*
678 * ignore this to avoid double cqes of bad wqe
679 * that caused sqe and turn off purge flag
680 */
681 qp->sqerr_purgeflag = 0;
682 goto repoll;
683 }
684 }
685
686 is_error = cqe->status & WC_STATUS_ERROR_BIT;
687
688 /* trace error CQEs if debug_level >= 1, trace all CQEs if >= 3 */
689 if (unlikely(ehca_debug_level >= 3 || (ehca_debug_level && is_error))) {
690 ehca_dbg(cq->device,
691 "Received %sCOMPLETION ehca_cq=%p cq_num=%x -----",
692 is_error ? "ERROR " : "", my_cq, my_cq->cq_number);
693 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
694 my_cq, my_cq->cq_number);
695 ehca_dbg(cq->device,
696 "ehca_cq=%p cq_num=%x -------------------------",
697 my_cq, my_cq->cq_number);
698 }
699
700 read_lock(&ehca_qp_idr_lock);
701 my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
702 read_unlock(&ehca_qp_idr_lock);
703 if (!my_qp)
704 goto repoll;
705 wc->qp = &my_qp->ib_qp;
706
707 qmap_tail_idx = get_app_wr_id(cqe->work_request_id);
708 if (!(cqe->w_completion_flags & WC_SEND_RECEIVE_BIT))
709 /* We got a send completion. */
710 qmap = &my_qp->sq_map;
711 else
712 /* We got a receive completion. */
713 qmap = &my_qp->rq_map;
714
715 /* advance the tail pointer */
716 qmap->tail = qmap_tail_idx;
717
718 if (is_error) {
719 /*
720 * set left_to_poll to 0 because in error state, we will not
721 * get any additional CQEs
722 */
723 my_qp->sq_map.next_wqe_idx = next_index(my_qp->sq_map.tail,
724 my_qp->sq_map.entries);
725 my_qp->sq_map.left_to_poll = 0;
726 ehca_add_to_err_list(my_qp, 1);
727
728 my_qp->rq_map.next_wqe_idx = next_index(my_qp->rq_map.tail,
729 my_qp->rq_map.entries);
730 my_qp->rq_map.left_to_poll = 0;
731 if (HAS_RQ(my_qp))
732 ehca_add_to_err_list(my_qp, 0);
733 }
734
735 qmap_entry = &qmap->map[qmap_tail_idx];
736 if (qmap_entry->reported) {
737 ehca_warn(cq->device, "Double cqe on qp_num=%#x",
738 my_qp->real_qp_num);
739 /* found a double cqe, discard it and read next one */
740 goto repoll;
741 }
742
743 wc->wr_id = replace_wr_id(cqe->work_request_id, qmap_entry->app_wr_id);
744 qmap_entry->reported = 1;
745
746 /* if left_to_poll is decremented to 0, add the QP to the error list */
747 if (qmap->left_to_poll > 0) {
748 qmap->left_to_poll--;
749 if ((my_qp->sq_map.left_to_poll == 0) &&
750 (my_qp->rq_map.left_to_poll == 0)) {
751 ehca_add_to_err_list(my_qp, 1);
752 if (HAS_RQ(my_qp))
753 ehca_add_to_err_list(my_qp, 0);
754 }
755 }
756
757 /* eval ib_wc_opcode */
758 wc->opcode = ib_wc_opcode[cqe->optype]-1;
759 if (unlikely(wc->opcode == -1)) {
760 ehca_err(cq->device, "Invalid cqe->OPType=%x cqe->status=%x "
761 "ehca_cq=%p cq_num=%x",
762 cqe->optype, cqe->status, my_cq, my_cq->cq_number);
763 /* dump cqe for other infos */
764 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
765 my_cq, my_cq->cq_number);
766 /* update also queue adder to throw away this entry!!! */
767 goto repoll;
768 }
769
770 /* eval ib_wc_status */
771 if (unlikely(is_error)) {
772 /* complete with errors */
773 map_ib_wc_status(cqe->status, &wc->status);
774 wc->vendor_err = wc->status;
775 } else
776 wc->status = IB_WC_SUCCESS;
777
778 wc->byte_len = cqe->nr_bytes_transferred;
779 wc->pkey_index = cqe->pkey_index;
780 wc->slid = cqe->rlid;
781 wc->dlid_path_bits = cqe->dlid;
782 wc->src_qp = cqe->remote_qp_number;
783 /*
784 * HW has "Immed data present" and "GRH present" in bits 6 and 5.
785 * SW defines those in bits 1 and 0, so we can just shift and mask.
786 */
787 wc->wc_flags = (cqe->w_completion_flags >> 5) & 3;
788 wc->ex.imm_data = cpu_to_be32(cqe->immediate_data);
789 wc->sl = cqe->service_level;
790
791 poll_cq_one_exit0:
792 if (cqe_count > 0)
793 hipz_update_feca(my_cq, cqe_count);
794
795 return ret;
796 }
797
798 static int generate_flush_cqes(struct ehca_qp *my_qp, struct ib_cq *cq,
799 struct ib_wc *wc, int num_entries,
800 struct ipz_queue *ipz_queue, int on_sq)
801 {
802 int nr = 0;
803 struct ehca_wqe *wqe;
804 u64 offset;
805 struct ehca_queue_map *qmap;
806 struct ehca_qmap_entry *qmap_entry;
807
808 if (on_sq)
809 qmap = &my_qp->sq_map;
810 else
811 qmap = &my_qp->rq_map;
812
813 qmap_entry = &qmap->map[qmap->next_wqe_idx];
814
815 while ((nr < num_entries) && (qmap_entry->reported == 0)) {
816 /* generate flush CQE */
817
818 memset(wc, 0, sizeof(*wc));
819
820 offset = qmap->next_wqe_idx * ipz_queue->qe_size;
821 wqe = (struct ehca_wqe *)ipz_qeit_calc(ipz_queue, offset);
822 if (!wqe) {
823 ehca_err(cq->device, "Invalid wqe offset=%#llx on "
824 "qp_num=%#x", offset, my_qp->real_qp_num);
825 return nr;
826 }
827
828 wc->wr_id = replace_wr_id(wqe->work_request_id,
829 qmap_entry->app_wr_id);
830
831 if (on_sq) {
832 switch (wqe->optype) {
833 case WQE_OPTYPE_SEND:
834 wc->opcode = IB_WC_SEND;
835 break;
836 case WQE_OPTYPE_RDMAWRITE:
837 wc->opcode = IB_WC_RDMA_WRITE;
838 break;
839 case WQE_OPTYPE_RDMAREAD:
840 wc->opcode = IB_WC_RDMA_READ;
841 break;
842 default:
843 ehca_err(cq->device, "Invalid optype=%x",
844 wqe->optype);
845 return nr;
846 }
847 } else
848 wc->opcode = IB_WC_RECV;
849
850 if (wqe->wr_flag & WQE_WRFLAG_IMM_DATA_PRESENT) {
851 wc->ex.imm_data = wqe->immediate_data;
852 wc->wc_flags |= IB_WC_WITH_IMM;
853 }
854
855 wc->status = IB_WC_WR_FLUSH_ERR;
856
857 wc->qp = &my_qp->ib_qp;
858
859 /* mark as reported and advance next_wqe pointer */
860 qmap_entry->reported = 1;
861 qmap->next_wqe_idx = next_index(qmap->next_wqe_idx,
862 qmap->entries);
863 qmap_entry = &qmap->map[qmap->next_wqe_idx];
864
865 wc++; nr++;
866 }
867
868 return nr;
869
870 }
871
872 int ehca_poll_cq(struct ib_cq *cq, int num_entries, struct ib_wc *wc)
873 {
874 struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
875 int nr;
876 struct ehca_qp *err_qp;
877 struct ib_wc *current_wc = wc;
878 int ret = 0;
879 unsigned long flags;
880 int entries_left = num_entries;
881
882 if (num_entries < 1) {
883 ehca_err(cq->device, "Invalid num_entries=%d ehca_cq=%p "
884 "cq_num=%x", num_entries, my_cq, my_cq->cq_number);
885 ret = -EINVAL;
886 goto poll_cq_exit0;
887 }
888
889 spin_lock_irqsave(&my_cq->spinlock, flags);
890
891 /* generate flush cqes for send queues */
892 list_for_each_entry(err_qp, &my_cq->sqp_err_list, sq_err_node) {
893 nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
894 &err_qp->ipz_squeue, 1);
895 entries_left -= nr;
896 current_wc += nr;
897
898 if (entries_left == 0)
899 break;
900 }
901
902 /* generate flush cqes for receive queues */
903 list_for_each_entry(err_qp, &my_cq->rqp_err_list, rq_err_node) {
904 nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
905 &err_qp->ipz_rqueue, 0);
906 entries_left -= nr;
907 current_wc += nr;
908
909 if (entries_left == 0)
910 break;
911 }
912
913 for (nr = 0; nr < entries_left; nr++) {
914 ret = ehca_poll_cq_one(cq, current_wc);
915 if (ret)
916 break;
917 current_wc++;
918 } /* eof for nr */
919 entries_left -= nr;
920
921 spin_unlock_irqrestore(&my_cq->spinlock, flags);
922 if (ret == -EAGAIN || !ret)
923 ret = num_entries - entries_left;
924
925 poll_cq_exit0:
926 return ret;
927 }
928
929 int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags)
930 {
931 struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
932 int ret = 0;
933
934 switch (notify_flags & IB_CQ_SOLICITED_MASK) {
935 case IB_CQ_SOLICITED:
936 hipz_set_cqx_n0(my_cq, 1);
937 break;
938 case IB_CQ_NEXT_COMP:
939 hipz_set_cqx_n1(my_cq, 1);
940 break;
941 default:
942 return -EINVAL;
943 }
944
945 if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
946 unsigned long spl_flags;
947 spin_lock_irqsave(&my_cq->spinlock, spl_flags);
948 ret = ipz_qeit_is_valid(&my_cq->ipz_queue);
949 spin_unlock_irqrestore(&my_cq->spinlock, spl_flags);
950 }
951
952 return ret;
953 }
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