1 /*
2 * Copyright(c) 2015 - 2018 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48 #include "hfi.h"
49 #include "verbs_txreq.h"
50 #include "qp.h"
51
52 /* cut down ridiculously long IB macro names */
53 #define OP(x) UC_OP(x)
54
55 /**
56 * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
57 * @qp: a pointer to the QP
58 *
59 * Assume s_lock is held.
60 *
61 * Return 1 if constructed; otherwise, return 0.
62 */
63 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
64 {
65 struct hfi1_qp_priv *priv = qp->priv;
66 struct ib_other_headers *ohdr;
67 struct rvt_swqe *wqe;
68 u32 hwords;
69 u32 bth0 = 0;
70 u32 len;
71 u32 pmtu = qp->pmtu;
72 int middle = 0;
73
74 ps->s_txreq = get_txreq(ps->dev, qp);
75 if (!ps->s_txreq)
76 goto bail_no_tx;
77
78 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
79 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
80 goto bail;
81 /* We are in the error state, flush the work request. */
82 if (qp->s_last == READ_ONCE(qp->s_head))
83 goto bail;
84 /* If DMAs are in progress, we can't flush immediately. */
85 if (iowait_sdma_pending(&priv->s_iowait)) {
86 qp->s_flags |= RVT_S_WAIT_DMA;
87 goto bail;
88 }
89 clear_ahg(qp);
90 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
91 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
92 goto done_free_tx;
93 }
94
95 if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
96 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
97 hwords = 5;
98 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
99 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
100 else
101 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
102 } else {
103 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
104 hwords = 7;
105 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
106 (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
107 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
108 else
109 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
110 }
111
112 /* Get the next send request. */
113 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
114 qp->s_wqe = NULL;
115 switch (qp->s_state) {
116 default:
117 if (!(ib_rvt_state_ops[qp->state] &
118 RVT_PROCESS_NEXT_SEND_OK))
119 goto bail;
120 /* Check if send work queue is empty. */
121 if (qp->s_cur == READ_ONCE(qp->s_head)) {
122 clear_ahg(qp);
123 goto bail;
124 }
125 /*
126 * Local operations are processed immediately
127 * after all prior requests have completed.
128 */
129 if (wqe->wr.opcode == IB_WR_REG_MR ||
130 wqe->wr.opcode == IB_WR_LOCAL_INV) {
131 int local_ops = 0;
132 int err = 0;
133
134 if (qp->s_last != qp->s_cur)
135 goto bail;
136 if (++qp->s_cur == qp->s_size)
137 qp->s_cur = 0;
138 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
139 err = rvt_invalidate_rkey(
140 qp, wqe->wr.ex.invalidate_rkey);
141 local_ops = 1;
142 }
143 rvt_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
144 : IB_WC_SUCCESS);
145 if (local_ops)
146 atomic_dec(&qp->local_ops_pending);
147 goto done_free_tx;
148 }
149 /*
150 * Start a new request.
151 */
152 qp->s_psn = wqe->psn;
153 qp->s_sge.sge = wqe->sg_list[0];
154 qp->s_sge.sg_list = wqe->sg_list + 1;
155 qp->s_sge.num_sge = wqe->wr.num_sge;
156 qp->s_sge.total_len = wqe->length;
157 len = wqe->length;
158 qp->s_len = len;
159 switch (wqe->wr.opcode) {
160 case IB_WR_SEND:
161 case IB_WR_SEND_WITH_IMM:
162 if (len > pmtu) {
163 qp->s_state = OP(SEND_FIRST);
164 len = pmtu;
165 break;
166 }
167 if (wqe->wr.opcode == IB_WR_SEND) {
168 qp->s_state = OP(SEND_ONLY);
169 } else {
170 qp->s_state =
171 OP(SEND_ONLY_WITH_IMMEDIATE);
172 /* Immediate data comes after the BTH */
173 ohdr->u.imm_data = wqe->wr.ex.imm_data;
174 hwords += 1;
175 }
176 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
177 bth0 |= IB_BTH_SOLICITED;
178 qp->s_wqe = wqe;
179 if (++qp->s_cur >= qp->s_size)
180 qp->s_cur = 0;
181 break;
182
183 case IB_WR_RDMA_WRITE:
184 case IB_WR_RDMA_WRITE_WITH_IMM:
185 ohdr->u.rc.reth.vaddr =
186 cpu_to_be64(wqe->rdma_wr.remote_addr);
187 ohdr->u.rc.reth.rkey =
188 cpu_to_be32(wqe->rdma_wr.rkey);
189 ohdr->u.rc.reth.length = cpu_to_be32(len);
190 hwords += sizeof(struct ib_reth) / 4;
191 if (len > pmtu) {
192 qp->s_state = OP(RDMA_WRITE_FIRST);
193 len = pmtu;
194 break;
195 }
196 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
197 qp->s_state = OP(RDMA_WRITE_ONLY);
198 } else {
199 qp->s_state =
200 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
201 /* Immediate data comes after the RETH */
202 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
203 hwords += 1;
204 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
205 bth0 |= IB_BTH_SOLICITED;
206 }
207 qp->s_wqe = wqe;
208 if (++qp->s_cur >= qp->s_size)
209 qp->s_cur = 0;
210 break;
211
212 default:
213 goto bail;
214 }
215 break;
216
217 case OP(SEND_FIRST):
218 qp->s_state = OP(SEND_MIDDLE);
219 /* FALLTHROUGH */
220 case OP(SEND_MIDDLE):
221 len = qp->s_len;
222 if (len > pmtu) {
223 len = pmtu;
224 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
225 break;
226 }
227 if (wqe->wr.opcode == IB_WR_SEND) {
228 qp->s_state = OP(SEND_LAST);
229 } else {
230 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
231 /* Immediate data comes after the BTH */
232 ohdr->u.imm_data = wqe->wr.ex.imm_data;
233 hwords += 1;
234 }
235 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
236 bth0 |= IB_BTH_SOLICITED;
237 qp->s_wqe = wqe;
238 if (++qp->s_cur >= qp->s_size)
239 qp->s_cur = 0;
240 break;
241
242 case OP(RDMA_WRITE_FIRST):
243 qp->s_state = OP(RDMA_WRITE_MIDDLE);
244 /* FALLTHROUGH */
245 case OP(RDMA_WRITE_MIDDLE):
246 len = qp->s_len;
247 if (len > pmtu) {
248 len = pmtu;
249 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
250 break;
251 }
252 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
253 qp->s_state = OP(RDMA_WRITE_LAST);
254 } else {
255 qp->s_state =
256 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
257 /* Immediate data comes after the BTH */
258 ohdr->u.imm_data = wqe->wr.ex.imm_data;
259 hwords += 1;
260 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
261 bth0 |= IB_BTH_SOLICITED;
262 }
263 qp->s_wqe = wqe;
264 if (++qp->s_cur >= qp->s_size)
265 qp->s_cur = 0;
266 break;
267 }
268 qp->s_len -= len;
269 ps->s_txreq->hdr_dwords = hwords;
270 ps->s_txreq->sde = priv->s_sde;
271 ps->s_txreq->ss = &qp->s_sge;
272 ps->s_txreq->s_cur_size = len;
273 hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
274 qp->remote_qpn, mask_psn(qp->s_psn++),
275 middle, ps);
276 return 1;
277
278 done_free_tx:
279 hfi1_put_txreq(ps->s_txreq);
280 ps->s_txreq = NULL;
281 return 1;
282
283 bail:
284 hfi1_put_txreq(ps->s_txreq);
285
286 bail_no_tx:
287 ps->s_txreq = NULL;
288 qp->s_flags &= ~RVT_S_BUSY;
289 return 0;
290 }
291
292 /**
293 * hfi1_uc_rcv - handle an incoming UC packet
294 * @ibp: the port the packet came in on
295 * @hdr: the header of the packet
296 * @rcv_flags: flags relevant to rcv processing
297 * @data: the packet data
298 * @tlen: the length of the packet
299 * @qp: the QP for this packet.
300 *
301 * This is called from qp_rcv() to process an incoming UC packet
302 * for the given QP.
303 * Called at interrupt level.
304 */
305 void hfi1_uc_rcv(struct hfi1_packet *packet)
306 {
307 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
308 void *data = packet->payload;
309 u32 tlen = packet->tlen;
310 struct rvt_qp *qp = packet->qp;
311 struct ib_other_headers *ohdr = packet->ohdr;
312 u32 opcode = packet->opcode;
313 u32 hdrsize = packet->hlen;
314 u32 psn;
315 u32 pad = packet->pad;
316 struct ib_wc wc;
317 u32 pmtu = qp->pmtu;
318 struct ib_reth *reth;
319 int ret;
320 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
321
322 if (hfi1_ruc_check_hdr(ibp, packet))
323 return;
324
325 process_ecn(qp, packet);
326
327 psn = ib_bth_get_psn(ohdr);
328 /* Compare the PSN verses the expected PSN. */
329 if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
330 /*
331 * Handle a sequence error.
332 * Silently drop any current message.
333 */
334 qp->r_psn = psn;
335 inv:
336 if (qp->r_state == OP(SEND_FIRST) ||
337 qp->r_state == OP(SEND_MIDDLE)) {
338 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
339 qp->r_sge.num_sge = 0;
340 } else {
341 rvt_put_ss(&qp->r_sge);
342 }
343 qp->r_state = OP(SEND_LAST);
344 switch (opcode) {
345 case OP(SEND_FIRST):
346 case OP(SEND_ONLY):
347 case OP(SEND_ONLY_WITH_IMMEDIATE):
348 goto send_first;
349
350 case OP(RDMA_WRITE_FIRST):
351 case OP(RDMA_WRITE_ONLY):
352 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
353 goto rdma_first;
354
355 default:
356 goto drop;
357 }
358 }
359
360 /* Check for opcode sequence errors. */
361 switch (qp->r_state) {
362 case OP(SEND_FIRST):
363 case OP(SEND_MIDDLE):
364 if (opcode == OP(SEND_MIDDLE) ||
365 opcode == OP(SEND_LAST) ||
366 opcode == OP(SEND_LAST_WITH_IMMEDIATE))
367 break;
368 goto inv;
369
370 case OP(RDMA_WRITE_FIRST):
371 case OP(RDMA_WRITE_MIDDLE):
372 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
373 opcode == OP(RDMA_WRITE_LAST) ||
374 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
375 break;
376 goto inv;
377
378 default:
379 if (opcode == OP(SEND_FIRST) ||
380 opcode == OP(SEND_ONLY) ||
381 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
382 opcode == OP(RDMA_WRITE_FIRST) ||
383 opcode == OP(RDMA_WRITE_ONLY) ||
384 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
385 break;
386 goto inv;
387 }
388
389 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
390 rvt_comm_est(qp);
391
392 /* OK, process the packet. */
393 switch (opcode) {
394 case OP(SEND_FIRST):
395 case OP(SEND_ONLY):
396 case OP(SEND_ONLY_WITH_IMMEDIATE):
397 send_first:
398 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
399 qp->r_sge = qp->s_rdma_read_sge;
400 } else {
401 ret = rvt_get_rwqe(qp, false);
402 if (ret < 0)
403 goto op_err;
404 if (!ret)
405 goto drop;
406 /*
407 * qp->s_rdma_read_sge will be the owner
408 * of the mr references.
409 */
410 qp->s_rdma_read_sge = qp->r_sge;
411 }
412 qp->r_rcv_len = 0;
413 if (opcode == OP(SEND_ONLY))
414 goto no_immediate_data;
415 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
416 goto send_last_imm;
417 /* FALLTHROUGH */
418 case OP(SEND_MIDDLE):
419 /* Check for invalid length PMTU or posted rwqe len. */
420 /*
421 * There will be no padding for 9B packet but 16B packets
422 * will come in with some padding since we always add
423 * CRC and LT bytes which will need to be flit aligned
424 */
425 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
426 goto rewind;
427 qp->r_rcv_len += pmtu;
428 if (unlikely(qp->r_rcv_len > qp->r_len))
429 goto rewind;
430 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
431 break;
432
433 case OP(SEND_LAST_WITH_IMMEDIATE):
434 send_last_imm:
435 wc.ex.imm_data = ohdr->u.imm_data;
436 wc.wc_flags = IB_WC_WITH_IMM;
437 goto send_last;
438 case OP(SEND_LAST):
439 no_immediate_data:
440 wc.ex.imm_data = 0;
441 wc.wc_flags = 0;
442 send_last:
443 /* Check for invalid length. */
444 /* LAST len should be >= 1 */
445 if (unlikely(tlen < (hdrsize + extra_bytes)))
446 goto rewind;
447 /* Don't count the CRC. */
448 tlen -= (hdrsize + extra_bytes);
449 wc.byte_len = tlen + qp->r_rcv_len;
450 if (unlikely(wc.byte_len > qp->r_len))
451 goto rewind;
452 wc.opcode = IB_WC_RECV;
453 rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
454 rvt_put_ss(&qp->s_rdma_read_sge);
455 last_imm:
456 wc.wr_id = qp->r_wr_id;
457 wc.status = IB_WC_SUCCESS;
458 wc.qp = &qp->ibqp;
459 wc.src_qp = qp->remote_qpn;
460 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
461 /*
462 * It seems that IB mandates the presence of an SL in a
463 * work completion only for the UD transport (see section
464 * 11.4.2 of IBTA Vol. 1).
465 *
466 * However, the way the SL is chosen below is consistent
467 * with the way that IB/qib works and is trying avoid
468 * introducing incompatibilities.
469 *
470 * See also OPA Vol. 1, section 9.7.6, and table 9-17.
471 */
472 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
473 /* zero fields that are N/A */
474 wc.vendor_err = 0;
475 wc.pkey_index = 0;
476 wc.dlid_path_bits = 0;
477 wc.port_num = 0;
478 /* Signal completion event if the solicited bit is set. */
479 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
480 break;
481
482 case OP(RDMA_WRITE_FIRST):
483 case OP(RDMA_WRITE_ONLY):
484 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
485 rdma_first:
486 if (unlikely(!(qp->qp_access_flags &
487 IB_ACCESS_REMOTE_WRITE))) {
488 goto drop;
489 }
490 reth = &ohdr->u.rc.reth;
491 qp->r_len = be32_to_cpu(reth->length);
492 qp->r_rcv_len = 0;
493 qp->r_sge.sg_list = NULL;
494 if (qp->r_len != 0) {
495 u32 rkey = be32_to_cpu(reth->rkey);
496 u64 vaddr = be64_to_cpu(reth->vaddr);
497 int ok;
498
499 /* Check rkey */
500 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
501 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
502 if (unlikely(!ok))
503 goto drop;
504 qp->r_sge.num_sge = 1;
505 } else {
506 qp->r_sge.num_sge = 0;
507 qp->r_sge.sge.mr = NULL;
508 qp->r_sge.sge.vaddr = NULL;
509 qp->r_sge.sge.length = 0;
510 qp->r_sge.sge.sge_length = 0;
511 }
512 if (opcode == OP(RDMA_WRITE_ONLY)) {
513 goto rdma_last;
514 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
515 wc.ex.imm_data = ohdr->u.rc.imm_data;
516 goto rdma_last_imm;
517 }
518 /* FALLTHROUGH */
519 case OP(RDMA_WRITE_MIDDLE):
520 /* Check for invalid length PMTU or posted rwqe len. */
521 if (unlikely(tlen != (hdrsize + pmtu + 4)))
522 goto drop;
523 qp->r_rcv_len += pmtu;
524 if (unlikely(qp->r_rcv_len > qp->r_len))
525 goto drop;
526 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
527 break;
528
529 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
530 wc.ex.imm_data = ohdr->u.imm_data;
531 rdma_last_imm:
532 wc.wc_flags = IB_WC_WITH_IMM;
533
534 /* Check for invalid length. */
535 /* LAST len should be >= 1 */
536 if (unlikely(tlen < (hdrsize + pad + 4)))
537 goto drop;
538 /* Don't count the CRC. */
539 tlen -= (hdrsize + extra_bytes);
540 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
541 goto drop;
542 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
543 rvt_put_ss(&qp->s_rdma_read_sge);
544 } else {
545 ret = rvt_get_rwqe(qp, true);
546 if (ret < 0)
547 goto op_err;
548 if (!ret)
549 goto drop;
550 }
551 wc.byte_len = qp->r_len;
552 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
553 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
554 rvt_put_ss(&qp->r_sge);
555 goto last_imm;
556
557 case OP(RDMA_WRITE_LAST):
558 rdma_last:
559 /* Check for invalid length. */
560 /* LAST len should be >= 1 */
561 if (unlikely(tlen < (hdrsize + pad + 4)))
562 goto drop;
563 /* Don't count the CRC. */
564 tlen -= (hdrsize + extra_bytes);
565 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
566 goto drop;
567 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
568 rvt_put_ss(&qp->r_sge);
569 break;
570
571 default:
572 /* Drop packet for unknown opcodes. */
573 goto drop;
574 }
575 qp->r_psn++;
576 qp->r_state = opcode;
577 return;
578
579 rewind:
580 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
581 qp->r_sge.num_sge = 0;
582 drop:
583 ibp->rvp.n_pkt_drops++;
584 return;
585
586 op_err:
587 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
588 }