GNU Linux-libre 4.9.287-gnu1
[releases.git] / drivers / infiniband / hw / qib / qib_uc.c
1 /*
2  * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
3  * All rights reserved.
4  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34
35 #include "qib.h"
36
37 /* cut down ridiculously long IB macro names */
38 #define OP(x) IB_OPCODE_UC_##x
39
40 /**
41  * qib_make_uc_req - construct a request packet (SEND, RDMA write)
42  * @qp: a pointer to the QP
43  *
44  * Assumes the s_lock is held.
45  *
46  * Return 1 if constructed; otherwise, return 0.
47  */
48 int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
49 {
50         struct qib_qp_priv *priv = qp->priv;
51         struct ib_other_headers *ohdr;
52         struct rvt_swqe *wqe;
53         u32 hwords;
54         u32 bth0;
55         u32 len;
56         u32 pmtu = qp->pmtu;
57         int ret = 0;
58
59         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
60                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
61                         goto bail;
62                 /* We are in the error state, flush the work request. */
63                 smp_read_barrier_depends(); /* see post_one_send() */
64                 if (qp->s_last == ACCESS_ONCE(qp->s_head))
65                         goto bail;
66                 /* If DMAs are in progress, we can't flush immediately. */
67                 if (atomic_read(&priv->s_dma_busy)) {
68                         qp->s_flags |= RVT_S_WAIT_DMA;
69                         goto bail;
70                 }
71                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
72                 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
73                 goto done;
74         }
75
76         ohdr = &priv->s_hdr->u.oth;
77         if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
78                 ohdr = &priv->s_hdr->u.l.oth;
79
80         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
81         hwords = 5;
82         bth0 = 0;
83
84         /* Get the next send request. */
85         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
86         qp->s_wqe = NULL;
87         switch (qp->s_state) {
88         default:
89                 if (!(ib_rvt_state_ops[qp->state] &
90                     RVT_PROCESS_NEXT_SEND_OK))
91                         goto bail;
92                 /* Check if send work queue is empty. */
93                 smp_read_barrier_depends(); /* see post_one_send() */
94                 if (qp->s_cur == ACCESS_ONCE(qp->s_head))
95                         goto bail;
96                 /*
97                  * Start a new request.
98                  */
99                 qp->s_psn = wqe->psn;
100                 qp->s_sge.sge = wqe->sg_list[0];
101                 qp->s_sge.sg_list = wqe->sg_list + 1;
102                 qp->s_sge.num_sge = wqe->wr.num_sge;
103                 qp->s_sge.total_len = wqe->length;
104                 len = wqe->length;
105                 qp->s_len = len;
106                 switch (wqe->wr.opcode) {
107                 case IB_WR_SEND:
108                 case IB_WR_SEND_WITH_IMM:
109                         if (len > pmtu) {
110                                 qp->s_state = OP(SEND_FIRST);
111                                 len = pmtu;
112                                 break;
113                         }
114                         if (wqe->wr.opcode == IB_WR_SEND)
115                                 qp->s_state = OP(SEND_ONLY);
116                         else {
117                                 qp->s_state =
118                                         OP(SEND_ONLY_WITH_IMMEDIATE);
119                                 /* Immediate data comes after the BTH */
120                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
121                                 hwords += 1;
122                         }
123                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
124                                 bth0 |= IB_BTH_SOLICITED;
125                         qp->s_wqe = wqe;
126                         if (++qp->s_cur >= qp->s_size)
127                                 qp->s_cur = 0;
128                         break;
129
130                 case IB_WR_RDMA_WRITE:
131                 case IB_WR_RDMA_WRITE_WITH_IMM:
132                         ohdr->u.rc.reth.vaddr =
133                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
134                         ohdr->u.rc.reth.rkey =
135                                 cpu_to_be32(wqe->rdma_wr.rkey);
136                         ohdr->u.rc.reth.length = cpu_to_be32(len);
137                         hwords += sizeof(struct ib_reth) / 4;
138                         if (len > pmtu) {
139                                 qp->s_state = OP(RDMA_WRITE_FIRST);
140                                 len = pmtu;
141                                 break;
142                         }
143                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
144                                 qp->s_state = OP(RDMA_WRITE_ONLY);
145                         else {
146                                 qp->s_state =
147                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
148                                 /* Immediate data comes after the RETH */
149                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
150                                 hwords += 1;
151                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
152                                         bth0 |= IB_BTH_SOLICITED;
153                         }
154                         qp->s_wqe = wqe;
155                         if (++qp->s_cur >= qp->s_size)
156                                 qp->s_cur = 0;
157                         break;
158
159                 default:
160                         goto bail;
161                 }
162                 break;
163
164         case OP(SEND_FIRST):
165                 qp->s_state = OP(SEND_MIDDLE);
166                 /* FALLTHROUGH */
167         case OP(SEND_MIDDLE):
168                 len = qp->s_len;
169                 if (len > pmtu) {
170                         len = pmtu;
171                         break;
172                 }
173                 if (wqe->wr.opcode == IB_WR_SEND)
174                         qp->s_state = OP(SEND_LAST);
175                 else {
176                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
177                         /* Immediate data comes after the BTH */
178                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
179                         hwords += 1;
180                 }
181                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
182                         bth0 |= IB_BTH_SOLICITED;
183                 qp->s_wqe = wqe;
184                 if (++qp->s_cur >= qp->s_size)
185                         qp->s_cur = 0;
186                 break;
187
188         case OP(RDMA_WRITE_FIRST):
189                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
190                 /* FALLTHROUGH */
191         case OP(RDMA_WRITE_MIDDLE):
192                 len = qp->s_len;
193                 if (len > pmtu) {
194                         len = pmtu;
195                         break;
196                 }
197                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
198                         qp->s_state = OP(RDMA_WRITE_LAST);
199                 else {
200                         qp->s_state =
201                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
202                         /* Immediate data comes after the BTH */
203                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
204                         hwords += 1;
205                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
206                                 bth0 |= IB_BTH_SOLICITED;
207                 }
208                 qp->s_wqe = wqe;
209                 if (++qp->s_cur >= qp->s_size)
210                         qp->s_cur = 0;
211                 break;
212         }
213         qp->s_len -= len;
214         qp->s_hdrwords = hwords;
215         qp->s_cur_sge = &qp->s_sge;
216         qp->s_cur_size = len;
217         qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
218                             qp->s_psn++ & QIB_PSN_MASK);
219 done:
220         return 1;
221 bail:
222         qp->s_flags &= ~RVT_S_BUSY;
223         return ret;
224 }
225
226 /**
227  * qib_uc_rcv - handle an incoming UC packet
228  * @ibp: the port the packet came in on
229  * @hdr: the header of the packet
230  * @has_grh: true if the packet has a GRH
231  * @data: the packet data
232  * @tlen: the length of the packet
233  * @qp: the QP for this packet.
234  *
235  * This is called from qib_qp_rcv() to process an incoming UC packet
236  * for the given QP.
237  * Called at interrupt level.
238  */
239 void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
240                 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
241 {
242         struct ib_other_headers *ohdr;
243         u32 opcode;
244         u32 hdrsize;
245         u32 psn;
246         u32 pad;
247         struct ib_wc wc;
248         u32 pmtu = qp->pmtu;
249         struct ib_reth *reth;
250         int ret;
251
252         /* Check for GRH */
253         if (!has_grh) {
254                 ohdr = &hdr->u.oth;
255                 hdrsize = 8 + 12;       /* LRH + BTH */
256         } else {
257                 ohdr = &hdr->u.l.oth;
258                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
259         }
260
261         opcode = be32_to_cpu(ohdr->bth[0]);
262         if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
263                 return;
264
265         psn = be32_to_cpu(ohdr->bth[2]);
266         opcode >>= 24;
267
268         /* Compare the PSN verses the expected PSN. */
269         if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
270                 /*
271                  * Handle a sequence error.
272                  * Silently drop any current message.
273                  */
274                 qp->r_psn = psn;
275 inv:
276                 if (qp->r_state == OP(SEND_FIRST) ||
277                     qp->r_state == OP(SEND_MIDDLE)) {
278                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
279                         qp->r_sge.num_sge = 0;
280                 } else
281                         rvt_put_ss(&qp->r_sge);
282                 qp->r_state = OP(SEND_LAST);
283                 switch (opcode) {
284                 case OP(SEND_FIRST):
285                 case OP(SEND_ONLY):
286                 case OP(SEND_ONLY_WITH_IMMEDIATE):
287                         goto send_first;
288
289                 case OP(RDMA_WRITE_FIRST):
290                 case OP(RDMA_WRITE_ONLY):
291                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
292                         goto rdma_first;
293
294                 default:
295                         goto drop;
296                 }
297         }
298
299         /* Check for opcode sequence errors. */
300         switch (qp->r_state) {
301         case OP(SEND_FIRST):
302         case OP(SEND_MIDDLE):
303                 if (opcode == OP(SEND_MIDDLE) ||
304                     opcode == OP(SEND_LAST) ||
305                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
306                         break;
307                 goto inv;
308
309         case OP(RDMA_WRITE_FIRST):
310         case OP(RDMA_WRITE_MIDDLE):
311                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
312                     opcode == OP(RDMA_WRITE_LAST) ||
313                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
314                         break;
315                 goto inv;
316
317         default:
318                 if (opcode == OP(SEND_FIRST) ||
319                     opcode == OP(SEND_ONLY) ||
320                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
321                     opcode == OP(RDMA_WRITE_FIRST) ||
322                     opcode == OP(RDMA_WRITE_ONLY) ||
323                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
324                         break;
325                 goto inv;
326         }
327
328         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) {
329                 qp->r_flags |= RVT_R_COMM_EST;
330                 if (qp->ibqp.event_handler) {
331                         struct ib_event ev;
332
333                         ev.device = qp->ibqp.device;
334                         ev.element.qp = &qp->ibqp;
335                         ev.event = IB_EVENT_COMM_EST;
336                         qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
337                 }
338         }
339
340         /* OK, process the packet. */
341         switch (opcode) {
342         case OP(SEND_FIRST):
343         case OP(SEND_ONLY):
344         case OP(SEND_ONLY_WITH_IMMEDIATE):
345 send_first:
346                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
347                         qp->r_sge = qp->s_rdma_read_sge;
348                 else {
349                         ret = qib_get_rwqe(qp, 0);
350                         if (ret < 0)
351                                 goto op_err;
352                         if (!ret)
353                                 goto drop;
354                         /*
355                          * qp->s_rdma_read_sge will be the owner
356                          * of the mr references.
357                          */
358                         qp->s_rdma_read_sge = qp->r_sge;
359                 }
360                 qp->r_rcv_len = 0;
361                 if (opcode == OP(SEND_ONLY))
362                         goto no_immediate_data;
363                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
364                         goto send_last_imm;
365                 /* FALLTHROUGH */
366         case OP(SEND_MIDDLE):
367                 /* Check for invalid length PMTU or posted rwqe len. */
368                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
369                         goto rewind;
370                 qp->r_rcv_len += pmtu;
371                 if (unlikely(qp->r_rcv_len > qp->r_len))
372                         goto rewind;
373                 qib_copy_sge(&qp->r_sge, data, pmtu, 0);
374                 break;
375
376         case OP(SEND_LAST_WITH_IMMEDIATE):
377 send_last_imm:
378                 wc.ex.imm_data = ohdr->u.imm_data;
379                 hdrsize += 4;
380                 wc.wc_flags = IB_WC_WITH_IMM;
381                 goto send_last;
382         case OP(SEND_LAST):
383 no_immediate_data:
384                 wc.ex.imm_data = 0;
385                 wc.wc_flags = 0;
386 send_last:
387                 /* Get the number of bytes the message was padded by. */
388                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
389                 /* Check for invalid length. */
390                 /* XXX LAST len should be >= 1 */
391                 if (unlikely(tlen < (hdrsize + pad + 4)))
392                         goto rewind;
393                 /* Don't count the CRC. */
394                 tlen -= (hdrsize + pad + 4);
395                 wc.byte_len = tlen + qp->r_rcv_len;
396                 if (unlikely(wc.byte_len > qp->r_len))
397                         goto rewind;
398                 wc.opcode = IB_WC_RECV;
399                 qib_copy_sge(&qp->r_sge, data, tlen, 0);
400                 rvt_put_ss(&qp->s_rdma_read_sge);
401 last_imm:
402                 wc.wr_id = qp->r_wr_id;
403                 wc.status = IB_WC_SUCCESS;
404                 wc.qp = &qp->ibqp;
405                 wc.src_qp = qp->remote_qpn;
406                 wc.slid = qp->remote_ah_attr.dlid;
407                 wc.sl = qp->remote_ah_attr.sl;
408                 /* zero fields that are N/A */
409                 wc.vendor_err = 0;
410                 wc.pkey_index = 0;
411                 wc.dlid_path_bits = 0;
412                 wc.port_num = 0;
413                 /* Signal completion event if the solicited bit is set. */
414                 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
415                              (ohdr->bth[0] &
416                                 cpu_to_be32(IB_BTH_SOLICITED)) != 0);
417                 break;
418
419         case OP(RDMA_WRITE_FIRST):
420         case OP(RDMA_WRITE_ONLY):
421         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
422 rdma_first:
423                 if (unlikely(!(qp->qp_access_flags &
424                                IB_ACCESS_REMOTE_WRITE))) {
425                         goto drop;
426                 }
427                 reth = &ohdr->u.rc.reth;
428                 hdrsize += sizeof(*reth);
429                 qp->r_len = be32_to_cpu(reth->length);
430                 qp->r_rcv_len = 0;
431                 qp->r_sge.sg_list = NULL;
432                 if (qp->r_len != 0) {
433                         u32 rkey = be32_to_cpu(reth->rkey);
434                         u64 vaddr = be64_to_cpu(reth->vaddr);
435                         int ok;
436
437                         /* Check rkey */
438                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
439                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
440                         if (unlikely(!ok))
441                                 goto drop;
442                         qp->r_sge.num_sge = 1;
443                 } else {
444                         qp->r_sge.num_sge = 0;
445                         qp->r_sge.sge.mr = NULL;
446                         qp->r_sge.sge.vaddr = NULL;
447                         qp->r_sge.sge.length = 0;
448                         qp->r_sge.sge.sge_length = 0;
449                 }
450                 if (opcode == OP(RDMA_WRITE_ONLY))
451                         goto rdma_last;
452                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
453                         wc.ex.imm_data = ohdr->u.rc.imm_data;
454                         goto rdma_last_imm;
455                 }
456                 /* FALLTHROUGH */
457         case OP(RDMA_WRITE_MIDDLE):
458                 /* Check for invalid length PMTU or posted rwqe len. */
459                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
460                         goto drop;
461                 qp->r_rcv_len += pmtu;
462                 if (unlikely(qp->r_rcv_len > qp->r_len))
463                         goto drop;
464                 qib_copy_sge(&qp->r_sge, data, pmtu, 1);
465                 break;
466
467         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
468                 wc.ex.imm_data = ohdr->u.imm_data;
469 rdma_last_imm:
470                 hdrsize += 4;
471                 wc.wc_flags = IB_WC_WITH_IMM;
472
473                 /* Get the number of bytes the message was padded by. */
474                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
475                 /* Check for invalid length. */
476                 /* XXX LAST len should be >= 1 */
477                 if (unlikely(tlen < (hdrsize + pad + 4)))
478                         goto drop;
479                 /* Don't count the CRC. */
480                 tlen -= (hdrsize + pad + 4);
481                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
482                         goto drop;
483                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
484                         rvt_put_ss(&qp->s_rdma_read_sge);
485                 else {
486                         ret = qib_get_rwqe(qp, 1);
487                         if (ret < 0)
488                                 goto op_err;
489                         if (!ret)
490                                 goto drop;
491                 }
492                 wc.byte_len = qp->r_len;
493                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
494                 qib_copy_sge(&qp->r_sge, data, tlen, 1);
495                 rvt_put_ss(&qp->r_sge);
496                 goto last_imm;
497
498         case OP(RDMA_WRITE_LAST):
499 rdma_last:
500                 /* Get the number of bytes the message was padded by. */
501                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
502                 /* Check for invalid length. */
503                 /* XXX LAST len should be >= 1 */
504                 if (unlikely(tlen < (hdrsize + pad + 4)))
505                         goto drop;
506                 /* Don't count the CRC. */
507                 tlen -= (hdrsize + pad + 4);
508                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
509                         goto drop;
510                 qib_copy_sge(&qp->r_sge, data, tlen, 1);
511                 rvt_put_ss(&qp->r_sge);
512                 break;
513
514         default:
515                 /* Drop packet for unknown opcodes. */
516                 goto drop;
517         }
518         qp->r_psn++;
519         qp->r_state = opcode;
520         return;
521
522 rewind:
523         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
524         qp->r_sge.num_sge = 0;
525 drop:
526         ibp->rvp.n_pkt_drops++;
527         return;
528
529 op_err:
530         qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
531         return;
532
533 }