Merge branch 'linus' into x86/mm
[linux-2.6] / 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 <asm/system.h>
46 #include "ehca_classes.h"
47 #include "ehca_tools.h"
48 #include "ehca_qes.h"
49 #include "ehca_iverbs.h"
50 #include "hcp_if.h"
51 #include "hipz_fns.h"
52
53 /* in RC traffic, insert an empty RDMA READ every this many packets */
54 #define ACK_CIRC_THRESHOLD 2000000
55
56 static u64 replace_wr_id(u64 wr_id, u16 idx)
57 {
58         u64 ret;
59
60         ret = wr_id & ~QMAP_IDX_MASK;
61         ret |= idx & QMAP_IDX_MASK;
62
63         return ret;
64 }
65
66 static u16 get_app_wr_id(u64 wr_id)
67 {
68         return wr_id & QMAP_IDX_MASK;
69 }
70
71 static inline int ehca_write_rwqe(struct ipz_queue *ipz_rqueue,
72                                   struct ehca_wqe *wqe_p,
73                                   struct ib_recv_wr *recv_wr,
74                                   u32 rq_map_idx)
75 {
76         u8 cnt_ds;
77         if (unlikely((recv_wr->num_sge < 0) ||
78                      (recv_wr->num_sge > ipz_rqueue->act_nr_of_sg))) {
79                 ehca_gen_err("Invalid number of WQE SGE. "
80                          "num_sqe=%x max_nr_of_sg=%x",
81                          recv_wr->num_sge, ipz_rqueue->act_nr_of_sg);
82                 return -EINVAL; /* invalid SG list length */
83         }
84
85         /* clear wqe header until sglist */
86         memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
87
88         wqe_p->work_request_id = replace_wr_id(recv_wr->wr_id, rq_map_idx);
89         wqe_p->nr_of_data_seg = recv_wr->num_sge;
90
91         for (cnt_ds = 0; cnt_ds < recv_wr->num_sge; cnt_ds++) {
92                 wqe_p->u.all_rcv.sg_list[cnt_ds].vaddr =
93                         recv_wr->sg_list[cnt_ds].addr;
94                 wqe_p->u.all_rcv.sg_list[cnt_ds].lkey =
95                         recv_wr->sg_list[cnt_ds].lkey;
96                 wqe_p->u.all_rcv.sg_list[cnt_ds].length =
97                         recv_wr->sg_list[cnt_ds].length;
98         }
99
100         if (ehca_debug_level >= 3) {
101                 ehca_gen_dbg("RECEIVE WQE written into ipz_rqueue=%p",
102                              ipz_rqueue);
103                 ehca_dmp(wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "recv wqe");
104         }
105
106         return 0;
107 }
108
109 #if defined(DEBUG_GSI_SEND_WR)
110
111 /* need ib_mad struct */
112 #include <rdma/ib_mad.h>
113
114 static void trace_send_wr_ud(const struct ib_send_wr *send_wr)
115 {
116         int idx;
117         int j;
118         while (send_wr) {
119                 struct ib_mad_hdr *mad_hdr = send_wr->wr.ud.mad_hdr;
120                 struct ib_sge *sge = send_wr->sg_list;
121                 ehca_gen_dbg("send_wr#%x wr_id=%lx num_sge=%x "
122                              "send_flags=%x opcode=%x", idx, send_wr->wr_id,
123                              send_wr->num_sge, send_wr->send_flags,
124                              send_wr->opcode);
125                 if (mad_hdr) {
126                         ehca_gen_dbg("send_wr#%x mad_hdr base_version=%x "
127                                      "mgmt_class=%x class_version=%x method=%x "
128                                      "status=%x class_specific=%x tid=%lx "
129                                      "attr_id=%x resv=%x attr_mod=%x",
130                                      idx, mad_hdr->base_version,
131                                      mad_hdr->mgmt_class,
132                                      mad_hdr->class_version, mad_hdr->method,
133                                      mad_hdr->status, mad_hdr->class_specific,
134                                      mad_hdr->tid, mad_hdr->attr_id,
135                                      mad_hdr->resv,
136                                      mad_hdr->attr_mod);
137                 }
138                 for (j = 0; j < send_wr->num_sge; j++) {
139                         u8 *data = (u8 *)abs_to_virt(sge->addr);
140                         ehca_gen_dbg("send_wr#%x sge#%x addr=%p length=%x "
141                                      "lkey=%x",
142                                      idx, j, data, sge->length, sge->lkey);
143                         /* assume length is n*16 */
144                         ehca_dmp(data, sge->length, "send_wr#%x sge#%x",
145                                  idx, j);
146                         sge++;
147                 } /* eof for j */
148                 idx++;
149                 send_wr = send_wr->next;
150         } /* eof while send_wr */
151 }
152
153 #endif /* DEBUG_GSI_SEND_WR */
154
155 static inline int ehca_write_swqe(struct ehca_qp *qp,
156                                   struct ehca_wqe *wqe_p,
157                                   const struct ib_send_wr *send_wr,
158                                   u32 sq_map_idx,
159                                   int hidden)
160 {
161         u32 idx;
162         u64 dma_length;
163         struct ehca_av *my_av;
164         u32 remote_qkey = send_wr->wr.ud.remote_qkey;
165         struct ehca_qmap_entry *qmap_entry = &qp->sq_map.map[sq_map_idx];
166
167         if (unlikely((send_wr->num_sge < 0) ||
168                      (send_wr->num_sge > qp->ipz_squeue.act_nr_of_sg))) {
169                 ehca_gen_err("Invalid number of WQE SGE. "
170                          "num_sqe=%x max_nr_of_sg=%x",
171                          send_wr->num_sge, qp->ipz_squeue.act_nr_of_sg);
172                 return -EINVAL; /* invalid SG list length */
173         }
174
175         /* clear wqe header until sglist */
176         memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
177
178         wqe_p->work_request_id = replace_wr_id(send_wr->wr_id, sq_map_idx);
179
180         qmap_entry->app_wr_id = get_app_wr_id(send_wr->wr_id);
181         qmap_entry->reported = 0;
182         qmap_entry->cqe_req = 0;
183
184         switch (send_wr->opcode) {
185         case IB_WR_SEND:
186         case IB_WR_SEND_WITH_IMM:
187                 wqe_p->optype = WQE_OPTYPE_SEND;
188                 break;
189         case IB_WR_RDMA_WRITE:
190         case IB_WR_RDMA_WRITE_WITH_IMM:
191                 wqe_p->optype = WQE_OPTYPE_RDMAWRITE;
192                 break;
193         case IB_WR_RDMA_READ:
194                 wqe_p->optype = WQE_OPTYPE_RDMAREAD;
195                 break;
196         default:
197                 ehca_gen_err("Invalid opcode=%x", send_wr->opcode);
198                 return -EINVAL; /* invalid opcode */
199         }
200
201         wqe_p->wqef = (send_wr->opcode) & WQEF_HIGH_NIBBLE;
202
203         wqe_p->wr_flag = 0;
204
205         if ((send_wr->send_flags & IB_SEND_SIGNALED ||
206             qp->init_attr.sq_sig_type == IB_SIGNAL_ALL_WR)
207             && !hidden) {
208                 wqe_p->wr_flag |= WQE_WRFLAG_REQ_SIGNAL_COM;
209                 qmap_entry->cqe_req = 1;
210         }
211
212         if (send_wr->opcode == IB_WR_SEND_WITH_IMM ||
213             send_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
214                 /* this might not work as long as HW does not support it */
215                 wqe_p->immediate_data = be32_to_cpu(send_wr->ex.imm_data);
216                 wqe_p->wr_flag |= WQE_WRFLAG_IMM_DATA_PRESENT;
217         }
218
219         wqe_p->nr_of_data_seg = send_wr->num_sge;
220
221         switch (qp->qp_type) {
222         case IB_QPT_SMI:
223         case IB_QPT_GSI:
224                 /* no break is intential here */
225         case IB_QPT_UD:
226                 /* IB 1.2 spec C10-15 compliance */
227                 if (send_wr->wr.ud.remote_qkey & 0x80000000)
228                         remote_qkey = qp->qkey;
229
230                 wqe_p->destination_qp_number = send_wr->wr.ud.remote_qpn << 8;
231                 wqe_p->local_ee_context_qkey = remote_qkey;
232                 if (unlikely(!send_wr->wr.ud.ah)) {
233                         ehca_gen_err("wr.ud.ah is NULL. qp=%p", qp);
234                         return -EINVAL;
235                 }
236                 if (unlikely(send_wr->wr.ud.remote_qpn == 0)) {
237                         ehca_gen_err("dest QP# is 0. qp=%x", qp->real_qp_num);
238                         return -EINVAL;
239                 }
240                 my_av = container_of(send_wr->wr.ud.ah, struct ehca_av, ib_ah);
241                 wqe_p->u.ud_av.ud_av = my_av->av;
242
243                 /*
244                  * omitted check of IB_SEND_INLINE
245                  * since HW does not support it
246                  */
247                 for (idx = 0; idx < send_wr->num_sge; idx++) {
248                         wqe_p->u.ud_av.sg_list[idx].vaddr =
249                                 send_wr->sg_list[idx].addr;
250                         wqe_p->u.ud_av.sg_list[idx].lkey =
251                                 send_wr->sg_list[idx].lkey;
252                         wqe_p->u.ud_av.sg_list[idx].length =
253                                 send_wr->sg_list[idx].length;
254                 } /* eof for idx */
255                 if (qp->qp_type == IB_QPT_SMI ||
256                     qp->qp_type == IB_QPT_GSI)
257                         wqe_p->u.ud_av.ud_av.pmtu = 1;
258                 if (qp->qp_type == IB_QPT_GSI) {
259                         wqe_p->pkeyi = send_wr->wr.ud.pkey_index;
260 #ifdef DEBUG_GSI_SEND_WR
261                         trace_send_wr_ud(send_wr);
262 #endif /* DEBUG_GSI_SEND_WR */
263                 }
264                 break;
265
266         case IB_QPT_UC:
267                 if (send_wr->send_flags & IB_SEND_FENCE)
268                         wqe_p->wr_flag |= WQE_WRFLAG_FENCE;
269                 /* no break is intentional here */
270         case IB_QPT_RC:
271                 /* TODO: atomic not implemented */
272                 wqe_p->u.nud.remote_virtual_adress =
273                         send_wr->wr.rdma.remote_addr;
274                 wqe_p->u.nud.rkey = send_wr->wr.rdma.rkey;
275
276                 /*
277                  * omitted checking of IB_SEND_INLINE
278                  * since HW does not support it
279                  */
280                 dma_length = 0;
281                 for (idx = 0; idx < send_wr->num_sge; idx++) {
282                         wqe_p->u.nud.sg_list[idx].vaddr =
283                                 send_wr->sg_list[idx].addr;
284                         wqe_p->u.nud.sg_list[idx].lkey =
285                                 send_wr->sg_list[idx].lkey;
286                         wqe_p->u.nud.sg_list[idx].length =
287                                 send_wr->sg_list[idx].length;
288                         dma_length += send_wr->sg_list[idx].length;
289                 } /* eof idx */
290                 wqe_p->u.nud.atomic_1st_op_dma_len = dma_length;
291
292                 /* unsolicited ack circumvention */
293                 if (send_wr->opcode == IB_WR_RDMA_READ) {
294                         /* on RDMA read, switch on and reset counters */
295                         qp->message_count = qp->packet_count = 0;
296                         qp->unsol_ack_circ = 1;
297                 } else
298                         /* else estimate #packets */
299                         qp->packet_count += (dma_length >> qp->mtu_shift) + 1;
300
301                 break;
302
303         default:
304                 ehca_gen_err("Invalid qptype=%x", qp->qp_type);
305                 return -EINVAL;
306         }
307
308         if (ehca_debug_level >= 3) {
309                 ehca_gen_dbg("SEND WQE written into queue qp=%p ", qp);
310                 ehca_dmp( wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "send wqe");
311         }
312         return 0;
313 }
314
315 /* map_ib_wc_status converts raw cqe_status to ib_wc_status */
316 static inline void map_ib_wc_status(u32 cqe_status,
317                                     enum ib_wc_status *wc_status)
318 {
319         if (unlikely(cqe_status & WC_STATUS_ERROR_BIT)) {
320                 switch (cqe_status & 0x3F) {
321                 case 0x01:
322                 case 0x21:
323                         *wc_status = IB_WC_LOC_LEN_ERR;
324                         break;
325                 case 0x02:
326                 case 0x22:
327                         *wc_status = IB_WC_LOC_QP_OP_ERR;
328                         break;
329                 case 0x03:
330                 case 0x23:
331                         *wc_status = IB_WC_LOC_EEC_OP_ERR;
332                         break;
333                 case 0x04:
334                 case 0x24:
335                         *wc_status = IB_WC_LOC_PROT_ERR;
336                         break;
337                 case 0x05:
338                 case 0x25:
339                         *wc_status = IB_WC_WR_FLUSH_ERR;
340                         break;
341                 case 0x06:
342                         *wc_status = IB_WC_MW_BIND_ERR;
343                         break;
344                 case 0x07: /* remote error - look into bits 20:24 */
345                         switch ((cqe_status
346                                  & WC_STATUS_REMOTE_ERROR_FLAGS) >> 11) {
347                         case 0x0:
348                                 /*
349                                  * PSN Sequence Error!
350                                  * couldn't find a matching status!
351                                  */
352                                 *wc_status = IB_WC_GENERAL_ERR;
353                                 break;
354                         case 0x1:
355                                 *wc_status = IB_WC_REM_INV_REQ_ERR;
356                                 break;
357                         case 0x2:
358                                 *wc_status = IB_WC_REM_ACCESS_ERR;
359                                 break;
360                         case 0x3:
361                                 *wc_status = IB_WC_REM_OP_ERR;
362                                 break;
363                         case 0x4:
364                                 *wc_status = IB_WC_REM_INV_RD_REQ_ERR;
365                                 break;
366                         }
367                         break;
368                 case 0x08:
369                         *wc_status = IB_WC_RETRY_EXC_ERR;
370                         break;
371                 case 0x09:
372                         *wc_status = IB_WC_RNR_RETRY_EXC_ERR;
373                         break;
374                 case 0x0A:
375                 case 0x2D:
376                         *wc_status = IB_WC_REM_ABORT_ERR;
377                         break;
378                 case 0x0B:
379                 case 0x2E:
380                         *wc_status = IB_WC_INV_EECN_ERR;
381                         break;
382                 case 0x0C:
383                 case 0x2F:
384                         *wc_status = IB_WC_INV_EEC_STATE_ERR;
385                         break;
386                 case 0x0D:
387                         *wc_status = IB_WC_BAD_RESP_ERR;
388                         break;
389                 case 0x10:
390                         /* WQE purged */
391                         *wc_status = IB_WC_WR_FLUSH_ERR;
392                         break;
393                 default:
394                         *wc_status = IB_WC_FATAL_ERR;
395
396                 }
397         } else
398                 *wc_status = IB_WC_SUCCESS;
399 }
400
401 static inline int post_one_send(struct ehca_qp *my_qp,
402                          struct ib_send_wr *cur_send_wr,
403                          struct ib_send_wr **bad_send_wr,
404                          int hidden)
405 {
406         struct ehca_wqe *wqe_p;
407         int ret;
408         u32 sq_map_idx;
409         u64 start_offset = my_qp->ipz_squeue.current_q_offset;
410
411         /* get pointer next to free WQE */
412         wqe_p = ipz_qeit_get_inc(&my_qp->ipz_squeue);
413         if (unlikely(!wqe_p)) {
414                 /* too many posted work requests: queue overflow */
415                 if (bad_send_wr)
416                         *bad_send_wr = cur_send_wr;
417                 ehca_err(my_qp->ib_qp.device, "Too many posted WQEs "
418                          "qp_num=%x", my_qp->ib_qp.qp_num);
419                 return -ENOMEM;
420         }
421
422         /*
423          * Get the index of the WQE in the send queue. The same index is used
424          * for writing into the sq_map.
425          */
426         sq_map_idx = start_offset / my_qp->ipz_squeue.qe_size;
427
428         /* write a SEND WQE into the QUEUE */
429         ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, sq_map_idx, hidden);
430         /*
431          * if something failed,
432          * reset the free entry pointer to the start value
433          */
434         if (unlikely(ret)) {
435                 my_qp->ipz_squeue.current_q_offset = start_offset;
436                 if (bad_send_wr)
437                         *bad_send_wr = cur_send_wr;
438                 ehca_err(my_qp->ib_qp.device, "Could not write WQE "
439                          "qp_num=%x", my_qp->ib_qp.qp_num);
440                 return -EINVAL;
441         }
442
443         return 0;
444 }
445
446 int ehca_post_send(struct ib_qp *qp,
447                    struct ib_send_wr *send_wr,
448                    struct ib_send_wr **bad_send_wr)
449 {
450         struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
451         struct ib_send_wr *cur_send_wr;
452         int wqe_cnt = 0;
453         int ret = 0;
454         unsigned long flags;
455
456         /* Reject WR if QP is in RESET, INIT or RTR state */
457         if (unlikely(my_qp->state < IB_QPS_RTS)) {
458                 ehca_err(qp->device, "Invalid QP state  qp_state=%d qpn=%x",
459                          my_qp->state, qp->qp_num);
460                 return -EINVAL;
461         }
462
463         /* LOCK the QUEUE */
464         spin_lock_irqsave(&my_qp->spinlock_s, flags);
465
466         /* Send an empty extra RDMA read if:
467          *  1) there has been an RDMA read on this connection before
468          *  2) no RDMA read occurred for ACK_CIRC_THRESHOLD link packets
469          *  3) we can be sure that any previous extra RDMA read has been
470          *     processed so we don't overflow the SQ
471          */
472         if (unlikely(my_qp->unsol_ack_circ &&
473                      my_qp->packet_count > ACK_CIRC_THRESHOLD &&
474                      my_qp->message_count > my_qp->init_attr.cap.max_send_wr)) {
475                 /* insert an empty RDMA READ to fix up the remote QP state */
476                 struct ib_send_wr circ_wr;
477                 memset(&circ_wr, 0, sizeof(circ_wr));
478                 circ_wr.opcode = IB_WR_RDMA_READ;
479                 post_one_send(my_qp, &circ_wr, NULL, 1); /* ignore retcode */
480                 wqe_cnt++;
481                 ehca_dbg(qp->device, "posted circ wr  qp_num=%x", qp->qp_num);
482                 my_qp->message_count = my_qp->packet_count = 0;
483         }
484
485         /* loop processes list of send reqs */
486         for (cur_send_wr = send_wr; cur_send_wr != NULL;
487              cur_send_wr = cur_send_wr->next) {
488                 ret = post_one_send(my_qp, cur_send_wr, bad_send_wr, 0);
489                 if (unlikely(ret)) {
490                         /* if one or more WQEs were successful, don't fail */
491                         if (wqe_cnt)
492                                 ret = 0;
493                         goto post_send_exit0;
494                 }
495                 wqe_cnt++;
496         } /* eof for cur_send_wr */
497
498 post_send_exit0:
499         iosync(); /* serialize GAL register access */
500         hipz_update_sqa(my_qp, wqe_cnt);
501         if (unlikely(ret || ehca_debug_level >= 2))
502                 ehca_dbg(qp->device, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
503                          my_qp, qp->qp_num, wqe_cnt, ret);
504         my_qp->message_count += wqe_cnt;
505         spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
506         return ret;
507 }
508
509 static int internal_post_recv(struct ehca_qp *my_qp,
510                               struct ib_device *dev,
511                               struct ib_recv_wr *recv_wr,
512                               struct ib_recv_wr **bad_recv_wr)
513 {
514         struct ib_recv_wr *cur_recv_wr;
515         struct ehca_wqe *wqe_p;
516         int wqe_cnt = 0;
517         int ret = 0;
518         u32 rq_map_idx;
519         unsigned long flags;
520         struct ehca_qmap_entry *qmap_entry;
521
522         if (unlikely(!HAS_RQ(my_qp))) {
523                 ehca_err(dev, "QP has no RQ  ehca_qp=%p qp_num=%x ext_type=%d",
524                          my_qp, my_qp->real_qp_num, my_qp->ext_type);
525                 return -ENODEV;
526         }
527
528         /* LOCK the QUEUE */
529         spin_lock_irqsave(&my_qp->spinlock_r, flags);
530
531         /* loop processes list of send reqs */
532         for (cur_recv_wr = recv_wr; cur_recv_wr != NULL;
533              cur_recv_wr = cur_recv_wr->next) {
534                 u64 start_offset = my_qp->ipz_rqueue.current_q_offset;
535                 /* get pointer next to free WQE */
536                 wqe_p = ipz_qeit_get_inc(&my_qp->ipz_rqueue);
537                 if (unlikely(!wqe_p)) {
538                         /* too many posted work requests: queue overflow */
539                         if (bad_recv_wr)
540                                 *bad_recv_wr = cur_recv_wr;
541                         if (wqe_cnt == 0) {
542                                 ret = -ENOMEM;
543                                 ehca_err(dev, "Too many posted WQEs "
544                                          "qp_num=%x", my_qp->real_qp_num);
545                         }
546                         goto post_recv_exit0;
547                 }
548                 /*
549                  * Get the index of the WQE in the recv queue. The same index
550                  * is used for writing into the rq_map.
551                  */
552                 rq_map_idx = start_offset / my_qp->ipz_rqueue.qe_size;
553
554                 /* write a RECV WQE into the QUEUE */
555                 ret = ehca_write_rwqe(&my_qp->ipz_rqueue, wqe_p, cur_recv_wr,
556                                 rq_map_idx);
557                 /*
558                  * if something failed,
559                  * reset the free entry pointer to the start value
560                  */
561                 if (unlikely(ret)) {
562                         my_qp->ipz_rqueue.current_q_offset = start_offset;
563                         *bad_recv_wr = cur_recv_wr;
564                         if (wqe_cnt == 0) {
565                                 ret = -EINVAL;
566                                 ehca_err(dev, "Could not write WQE "
567                                          "qp_num=%x", my_qp->real_qp_num);
568                         }
569                         goto post_recv_exit0;
570                 }
571
572                 qmap_entry = &my_qp->rq_map.map[rq_map_idx];
573                 qmap_entry->app_wr_id = get_app_wr_id(cur_recv_wr->wr_id);
574                 qmap_entry->reported = 0;
575                 qmap_entry->cqe_req = 1;
576
577                 wqe_cnt++;
578         } /* eof for cur_recv_wr */
579
580 post_recv_exit0:
581         iosync(); /* serialize GAL register access */
582         hipz_update_rqa(my_qp, wqe_cnt);
583         if (unlikely(ret || ehca_debug_level >= 2))
584             ehca_dbg(dev, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
585                      my_qp, my_qp->real_qp_num, wqe_cnt, ret);
586         spin_unlock_irqrestore(&my_qp->spinlock_r, flags);
587         return ret;
588 }
589
590 int ehca_post_recv(struct ib_qp *qp,
591                    struct ib_recv_wr *recv_wr,
592                    struct ib_recv_wr **bad_recv_wr)
593 {
594         struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
595
596         /* Reject WR if QP is in RESET state */
597         if (unlikely(my_qp->state == IB_QPS_RESET)) {
598                 ehca_err(qp->device, "Invalid QP state  qp_state=%d qpn=%x",
599                          my_qp->state, qp->qp_num);
600                 return -EINVAL;
601         }
602
603         return internal_post_recv(my_qp, qp->device, recv_wr, bad_recv_wr);
604 }
605
606 int ehca_post_srq_recv(struct ib_srq *srq,
607                        struct ib_recv_wr *recv_wr,
608                        struct ib_recv_wr **bad_recv_wr)
609 {
610         return internal_post_recv(container_of(srq, struct ehca_qp, ib_srq),
611                                   srq->device, recv_wr, bad_recv_wr);
612 }
613
614 /*
615  * ib_wc_opcode table converts ehca wc opcode to ib
616  * Since we use zero to indicate invalid opcode, the actual ib opcode must
617  * be decremented!!!
618  */
619 static const u8 ib_wc_opcode[255] = {
620         [0x01] = IB_WC_RECV+1,
621         [0x02] = IB_WC_RECV_RDMA_WITH_IMM+1,
622         [0x04] = IB_WC_BIND_MW+1,
623         [0x08] = IB_WC_FETCH_ADD+1,
624         [0x10] = IB_WC_COMP_SWAP+1,
625         [0x20] = IB_WC_RDMA_WRITE+1,
626         [0x40] = IB_WC_RDMA_READ+1,
627         [0x80] = IB_WC_SEND+1
628 };
629
630 /* internal function to poll one entry of cq */
631 static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
632 {
633         int ret = 0, qmap_tail_idx;
634         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
635         struct ehca_cqe *cqe;
636         struct ehca_qp *my_qp;
637         struct ehca_qmap_entry *qmap_entry;
638         struct ehca_queue_map *qmap;
639         int cqe_count = 0, is_error;
640
641 repoll:
642         cqe = (struct ehca_cqe *)
643                 ipz_qeit_get_inc_valid(&my_cq->ipz_queue);
644         if (!cqe) {
645                 ret = -EAGAIN;
646                 if (ehca_debug_level >= 3)
647                         ehca_dbg(cq->device, "Completion queue is empty  "
648                                  "my_cq=%p cq_num=%x", my_cq, my_cq->cq_number);
649                 goto poll_cq_one_exit0;
650         }
651
652         /* prevents loads being reordered across this point */
653         rmb();
654
655         cqe_count++;
656         if (unlikely(cqe->status & WC_STATUS_PURGE_BIT)) {
657                 struct ehca_qp *qp;
658                 int purgeflag;
659                 unsigned long flags;
660
661                 qp = ehca_cq_get_qp(my_cq, cqe->local_qp_number);
662                 if (!qp) {
663                         ehca_err(cq->device, "cq_num=%x qp_num=%x "
664                                  "could not find qp -> ignore cqe",
665                                  my_cq->cq_number, cqe->local_qp_number);
666                         ehca_dmp(cqe, 64, "cq_num=%x qp_num=%x",
667                                  my_cq->cq_number, cqe->local_qp_number);
668                         /* ignore this purged cqe */
669                         goto repoll;
670                 }
671                 spin_lock_irqsave(&qp->spinlock_s, flags);
672                 purgeflag = qp->sqerr_purgeflag;
673                 spin_unlock_irqrestore(&qp->spinlock_s, flags);
674
675                 if (purgeflag) {
676                         ehca_dbg(cq->device,
677                                  "Got CQE with purged bit qp_num=%x src_qp=%x",
678                                  cqe->local_qp_number, cqe->remote_qp_number);
679                         if (ehca_debug_level >= 2)
680                                 ehca_dmp(cqe, 64, "qp_num=%x src_qp=%x",
681                                          cqe->local_qp_number,
682                                          cqe->remote_qp_number);
683                         /*
684                          * ignore this to avoid double cqes of bad wqe
685                          * that caused sqe and turn off purge flag
686                          */
687                         qp->sqerr_purgeflag = 0;
688                         goto repoll;
689                 }
690         }
691
692         is_error = cqe->status & WC_STATUS_ERROR_BIT;
693
694         /* trace error CQEs if debug_level >= 1, trace all CQEs if >= 3 */
695         if (unlikely(ehca_debug_level >= 3 || (ehca_debug_level && is_error))) {
696                 ehca_dbg(cq->device,
697                          "Received %sCOMPLETION ehca_cq=%p cq_num=%x -----",
698                          is_error ? "ERROR " : "", my_cq, my_cq->cq_number);
699                 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
700                          my_cq, my_cq->cq_number);
701                 ehca_dbg(cq->device,
702                          "ehca_cq=%p cq_num=%x -------------------------",
703                          my_cq, my_cq->cq_number);
704         }
705
706         read_lock(&ehca_qp_idr_lock);
707         my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
708         read_unlock(&ehca_qp_idr_lock);
709         if (!my_qp)
710                 goto repoll;
711         wc->qp = &my_qp->ib_qp;
712
713         qmap_tail_idx = get_app_wr_id(cqe->work_request_id);
714         if (!(cqe->w_completion_flags & WC_SEND_RECEIVE_BIT))
715                 /* We got a send completion. */
716                 qmap = &my_qp->sq_map;
717         else
718                 /* We got a receive completion. */
719                 qmap = &my_qp->rq_map;
720
721         /* advance the tail pointer */
722         qmap->tail = qmap_tail_idx;
723
724         if (is_error) {
725                 /*
726                  * set left_to_poll to 0 because in error state, we will not
727                  * get any additional CQEs
728                  */
729                 my_qp->sq_map.next_wqe_idx = next_index(my_qp->sq_map.tail,
730                                                         my_qp->sq_map.entries);
731                 my_qp->sq_map.left_to_poll = 0;
732                 ehca_add_to_err_list(my_qp, 1);
733
734                 my_qp->rq_map.next_wqe_idx = next_index(my_qp->rq_map.tail,
735                                                         my_qp->rq_map.entries);
736                 my_qp->rq_map.left_to_poll = 0;
737                 if (HAS_RQ(my_qp))
738                         ehca_add_to_err_list(my_qp, 0);
739         }
740
741         qmap_entry = &qmap->map[qmap_tail_idx];
742         if (qmap_entry->reported) {
743                 ehca_warn(cq->device, "Double cqe on qp_num=%#x",
744                                 my_qp->real_qp_num);
745                 /* found a double cqe, discard it and read next one */
746                 goto repoll;
747         }
748
749         wc->wr_id = replace_wr_id(cqe->work_request_id, qmap_entry->app_wr_id);
750         qmap_entry->reported = 1;
751
752         /* if left_to_poll is decremented to 0, add the QP to the error list */
753         if (qmap->left_to_poll > 0) {
754                 qmap->left_to_poll--;
755                 if ((my_qp->sq_map.left_to_poll == 0) &&
756                                 (my_qp->rq_map.left_to_poll == 0)) {
757                         ehca_add_to_err_list(my_qp, 1);
758                         if (HAS_RQ(my_qp))
759                                 ehca_add_to_err_list(my_qp, 0);
760                 }
761         }
762
763         /* eval ib_wc_opcode */
764         wc->opcode = ib_wc_opcode[cqe->optype]-1;
765         if (unlikely(wc->opcode == -1)) {
766                 ehca_err(cq->device, "Invalid cqe->OPType=%x cqe->status=%x "
767                          "ehca_cq=%p cq_num=%x",
768                          cqe->optype, cqe->status, my_cq, my_cq->cq_number);
769                 /* dump cqe for other infos */
770                 ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
771                          my_cq, my_cq->cq_number);
772                 /* update also queue adder to throw away this entry!!! */
773                 goto repoll;
774         }
775
776         /* eval ib_wc_status */
777         if (unlikely(is_error)) {
778                 /* complete with errors */
779                 map_ib_wc_status(cqe->status, &wc->status);
780                 wc->vendor_err = wc->status;
781         } else
782                 wc->status = IB_WC_SUCCESS;
783
784         wc->byte_len = cqe->nr_bytes_transferred;
785         wc->pkey_index = cqe->pkey_index;
786         wc->slid = cqe->rlid;
787         wc->dlid_path_bits = cqe->dlid;
788         wc->src_qp = cqe->remote_qp_number;
789         wc->wc_flags = cqe->w_completion_flags;
790         wc->ex.imm_data = cpu_to_be32(cqe->immediate_data);
791         wc->sl = cqe->service_level;
792
793 poll_cq_one_exit0:
794         if (cqe_count > 0)
795                 hipz_update_feca(my_cq, cqe_count);
796
797         return ret;
798 }
799
800 static int generate_flush_cqes(struct ehca_qp *my_qp, struct ib_cq *cq,
801                                struct ib_wc *wc, int num_entries,
802                                struct ipz_queue *ipz_queue, int on_sq)
803 {
804         int nr = 0;
805         struct ehca_wqe *wqe;
806         u64 offset;
807         struct ehca_queue_map *qmap;
808         struct ehca_qmap_entry *qmap_entry;
809
810         if (on_sq)
811                 qmap = &my_qp->sq_map;
812         else
813                 qmap = &my_qp->rq_map;
814
815         qmap_entry = &qmap->map[qmap->next_wqe_idx];
816
817         while ((nr < num_entries) && (qmap_entry->reported == 0)) {
818                 /* generate flush CQE */
819
820                 memset(wc, 0, sizeof(*wc));
821
822                 offset = qmap->next_wqe_idx * ipz_queue->qe_size;
823                 wqe = (struct ehca_wqe *)ipz_qeit_calc(ipz_queue, offset);
824                 if (!wqe) {
825                         ehca_err(cq->device, "Invalid wqe offset=%#llx on "
826                                  "qp_num=%#x", offset, my_qp->real_qp_num);
827                         return nr;
828                 }
829
830                 wc->wr_id = replace_wr_id(wqe->work_request_id,
831                                           qmap_entry->app_wr_id);
832
833                 if (on_sq) {
834                         switch (wqe->optype) {
835                         case WQE_OPTYPE_SEND:
836                                 wc->opcode = IB_WC_SEND;
837                                 break;
838                         case WQE_OPTYPE_RDMAWRITE:
839                                 wc->opcode = IB_WC_RDMA_WRITE;
840                                 break;
841                         case WQE_OPTYPE_RDMAREAD:
842                                 wc->opcode = IB_WC_RDMA_READ;
843                                 break;
844                         default:
845                                 ehca_err(cq->device, "Invalid optype=%x",
846                                                 wqe->optype);
847                                 return nr;
848                         }
849                 } else
850                         wc->opcode = IB_WC_RECV;
851
852                 if (wqe->wr_flag & WQE_WRFLAG_IMM_DATA_PRESENT) {
853                         wc->ex.imm_data = wqe->immediate_data;
854                         wc->wc_flags |= IB_WC_WITH_IMM;
855                 }
856
857                 wc->status = IB_WC_WR_FLUSH_ERR;
858
859                 wc->qp = &my_qp->ib_qp;
860
861                 /* mark as reported and advance next_wqe pointer */
862                 qmap_entry->reported = 1;
863                 qmap->next_wqe_idx = next_index(qmap->next_wqe_idx,
864                                                 qmap->entries);
865                 qmap_entry = &qmap->map[qmap->next_wqe_idx];
866
867                 wc++; nr++;
868         }
869
870         return nr;
871
872 }
873
874 int ehca_poll_cq(struct ib_cq *cq, int num_entries, struct ib_wc *wc)
875 {
876         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
877         int nr;
878         struct ehca_qp *err_qp;
879         struct ib_wc *current_wc = wc;
880         int ret = 0;
881         unsigned long flags;
882         int entries_left = num_entries;
883
884         if (num_entries < 1) {
885                 ehca_err(cq->device, "Invalid num_entries=%d ehca_cq=%p "
886                          "cq_num=%x", num_entries, my_cq, my_cq->cq_number);
887                 ret = -EINVAL;
888                 goto poll_cq_exit0;
889         }
890
891         spin_lock_irqsave(&my_cq->spinlock, flags);
892
893         /* generate flush cqes for send queues */
894         list_for_each_entry(err_qp, &my_cq->sqp_err_list, sq_err_node) {
895                 nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
896                                 &err_qp->ipz_squeue, 1);
897                 entries_left -= nr;
898                 current_wc += nr;
899
900                 if (entries_left == 0)
901                         break;
902         }
903
904         /* generate flush cqes for receive queues */
905         list_for_each_entry(err_qp, &my_cq->rqp_err_list, rq_err_node) {
906                 nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
907                                 &err_qp->ipz_rqueue, 0);
908                 entries_left -= nr;
909                 current_wc += nr;
910
911                 if (entries_left == 0)
912                         break;
913         }
914
915         for (nr = 0; nr < entries_left; nr++) {
916                 ret = ehca_poll_cq_one(cq, current_wc);
917                 if (ret)
918                         break;
919                 current_wc++;
920         } /* eof for nr */
921         entries_left -= nr;
922
923         spin_unlock_irqrestore(&my_cq->spinlock, flags);
924         if (ret == -EAGAIN  || !ret)
925                 ret = num_entries - entries_left;
926
927 poll_cq_exit0:
928         return ret;
929 }
930
931 int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags)
932 {
933         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
934         int ret = 0;
935
936         switch (notify_flags & IB_CQ_SOLICITED_MASK) {
937         case IB_CQ_SOLICITED:
938                 hipz_set_cqx_n0(my_cq, 1);
939                 break;
940         case IB_CQ_NEXT_COMP:
941                 hipz_set_cqx_n1(my_cq, 1);
942                 break;
943         default:
944                 return -EINVAL;
945         }
946
947         if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
948                 unsigned long spl_flags;
949                 spin_lock_irqsave(&my_cq->spinlock, spl_flags);
950                 ret = ipz_qeit_is_valid(&my_cq->ipz_queue);
951                 spin_unlock_irqrestore(&my_cq->spinlock, spl_flags);
952         }
953
954         return ret;
955 }