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x86/topology: Update the 'cpu cores' field in /proc/cpuinfo correctly across CPU...
[cris-mirror.git] / drivers / infiniband / hw / hfi1 / rc.c
blobda58046a02eaa97c2278d39bc09a3ce731008294
1 /*
2 * Copyright(c) 2015, 2016 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 <linux/io.h>
49 #include <rdma/rdma_vt.h>
50 #include <rdma/rdmavt_qp.h>
51
52 #include "hfi.h"
53 #include "qp.h"
54 #include "verbs_txreq.h"
55 #include "trace.h"
56
57 /* cut down ridiculously long IB macro names */
58 #define OP(x) RC_OP(x)
59
60 static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe,
61 u32 psn, u32 pmtu)
62 {
63 u32 len;
64
65 len = delta_psn(psn, wqe->psn) * pmtu;
66 ss->sge = wqe->sg_list[0];
67 ss->sg_list = wqe->sg_list + 1;
68 ss->num_sge = wqe->wr.num_sge;
69 ss->total_len = wqe->length;
70 rvt_skip_sge(ss, len, false);
71 return wqe->length - len;
72 }
73
74 /**
75 * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
76 * @dev: the device for this QP
77 * @qp: a pointer to the QP
78 * @ohdr: a pointer to the IB header being constructed
79 * @ps: the xmit packet state
80 *
81 * Return 1 if constructed; otherwise, return 0.
82 * Note that we are in the responder's side of the QP context.
83 * Note the QP s_lock must be held.
84 */
85 static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp,
86 struct ib_other_headers *ohdr,
87 struct hfi1_pkt_state *ps)
88 {
89 struct rvt_ack_entry *e;
90 u32 hwords;
91 u32 len;
92 u32 bth0;
93 u32 bth2;
94 int middle = 0;
95 u32 pmtu = qp->pmtu;
96 struct hfi1_qp_priv *priv = qp->priv;
97
98 lockdep_assert_held(&qp->s_lock);
99 /* Don't send an ACK if we aren't supposed to. */
100 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
101 goto bail;
102
103 if (priv->hdr_type == HFI1_PKT_TYPE_9B)
104 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
105 hwords = 5;
106 else
107 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
108 hwords = 7;
109
110 switch (qp->s_ack_state) {
111 case OP(RDMA_READ_RESPONSE_LAST):
112 case OP(RDMA_READ_RESPONSE_ONLY):
113 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
114 if (e->rdma_sge.mr) {
115 rvt_put_mr(e->rdma_sge.mr);
116 e->rdma_sge.mr = NULL;
117 }
118 /* FALLTHROUGH */
119 case OP(ATOMIC_ACKNOWLEDGE):
120 /*
121 * We can increment the tail pointer now that the last
122 * response has been sent instead of only being
123 * constructed.
124 */
125 if (++qp->s_tail_ack_queue > HFI1_MAX_RDMA_ATOMIC)
126 qp->s_tail_ack_queue = 0;
127 /* FALLTHROUGH */
128 case OP(SEND_ONLY):
129 case OP(ACKNOWLEDGE):
130 /* Check for no next entry in the queue. */
131 if (qp->r_head_ack_queue == qp->s_tail_ack_queue) {
132 if (qp->s_flags & RVT_S_ACK_PENDING)
133 goto normal;
134 goto bail;
135 }
136
137 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
138 if (e->opcode == OP(RDMA_READ_REQUEST)) {
139 /*
140 * If a RDMA read response is being resent and
141 * we haven't seen the duplicate request yet,
142 * then stop sending the remaining responses the
143 * responder has seen until the requester re-sends it.
144 */
145 len = e->rdma_sge.sge_length;
146 if (len && !e->rdma_sge.mr) {
147 qp->s_tail_ack_queue = qp->r_head_ack_queue;
148 goto bail;
149 }
150 /* Copy SGE state in case we need to resend */
151 ps->s_txreq->mr = e->rdma_sge.mr;
152 if (ps->s_txreq->mr)
153 rvt_get_mr(ps->s_txreq->mr);
154 qp->s_ack_rdma_sge.sge = e->rdma_sge;
155 qp->s_ack_rdma_sge.num_sge = 1;
156 ps->s_txreq->ss = &qp->s_ack_rdma_sge;
157 if (len > pmtu) {
158 len = pmtu;
159 qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
160 } else {
161 qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
162 e->sent = 1;
163 }
164 ohdr->u.aeth = rvt_compute_aeth(qp);
165 hwords++;
166 qp->s_ack_rdma_psn = e->psn;
167 bth2 = mask_psn(qp->s_ack_rdma_psn++);
168 } else {
169 /* COMPARE_SWAP or FETCH_ADD */
170 ps->s_txreq->ss = NULL;
171 len = 0;
172 qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
173 ohdr->u.at.aeth = rvt_compute_aeth(qp);
174 ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth);
175 hwords += sizeof(ohdr->u.at) / sizeof(u32);
176 bth2 = mask_psn(e->psn);
177 e->sent = 1;
178 }
179 bth0 = qp->s_ack_state << 24;
180 break;
181
182 case OP(RDMA_READ_RESPONSE_FIRST):
183 qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
184 /* FALLTHROUGH */
185 case OP(RDMA_READ_RESPONSE_MIDDLE):
186 ps->s_txreq->ss = &qp->s_ack_rdma_sge;
187 ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr;
188 if (ps->s_txreq->mr)
189 rvt_get_mr(ps->s_txreq->mr);
190 len = qp->s_ack_rdma_sge.sge.sge_length;
191 if (len > pmtu) {
192 len = pmtu;
193 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
194 } else {
195 ohdr->u.aeth = rvt_compute_aeth(qp);
196 hwords++;
197 qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
198 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
199 e->sent = 1;
200 }
201 bth0 = qp->s_ack_state << 24;
202 bth2 = mask_psn(qp->s_ack_rdma_psn++);
203 break;
204
205 default:
206 normal:
207 /*
208 * Send a regular ACK.
209 * Set the s_ack_state so we wait until after sending
210 * the ACK before setting s_ack_state to ACKNOWLEDGE
211 * (see above).
212 */
213 qp->s_ack_state = OP(SEND_ONLY);
214 qp->s_flags &= ~RVT_S_ACK_PENDING;
215 ps->s_txreq->ss = NULL;
216 if (qp->s_nak_state)
217 ohdr->u.aeth =
218 cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
219 (qp->s_nak_state <<
220 IB_AETH_CREDIT_SHIFT));
221 else
222 ohdr->u.aeth = rvt_compute_aeth(qp);
223 hwords++;
224 len = 0;
225 bth0 = OP(ACKNOWLEDGE) << 24;
226 bth2 = mask_psn(qp->s_ack_psn);
227 }
228 qp->s_rdma_ack_cnt++;
229 ps->s_txreq->sde = priv->s_sde;
230 ps->s_txreq->s_cur_size = len;
231 ps->s_txreq->hdr_dwords = hwords;
232 hfi1_make_ruc_header(qp, ohdr, bth0, bth2, middle, ps);
233 return 1;
234
235 bail:
236 qp->s_ack_state = OP(ACKNOWLEDGE);
237 /*
238 * Ensure s_rdma_ack_cnt changes are committed prior to resetting
239 * RVT_S_RESP_PENDING
240 */
241 smp_wmb();
242 qp->s_flags &= ~(RVT_S_RESP_PENDING
243 | RVT_S_ACK_PENDING
244 | RVT_S_AHG_VALID);
245 return 0;
246 }
247
248 /**
249 * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
250 * @qp: a pointer to the QP
251 *
252 * Assumes s_lock is held.
253 *
254 * Return 1 if constructed; otherwise, return 0.
255 */
256 int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
257 {
258 struct hfi1_qp_priv *priv = qp->priv;
259 struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
260 struct ib_other_headers *ohdr;
261 struct rvt_sge_state *ss;
262 struct rvt_swqe *wqe;
263 u32 hwords;
264 u32 len;
265 u32 bth0 = 0;
266 u32 bth2;
267 u32 pmtu = qp->pmtu;
268 char newreq;
269 int middle = 0;
270 int delta;
271
272 lockdep_assert_held(&qp->s_lock);
273 ps->s_txreq = get_txreq(ps->dev, qp);
274 if (IS_ERR(ps->s_txreq))
275 goto bail_no_tx;
276
277 if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
278 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
279 hwords = 5;
280 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
281 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
282 else
283 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
284 } else {
285 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
286 hwords = 7;
287 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
288 (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
289 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
290 else
291 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
292 }
293
294 /* Sending responses has higher priority over sending requests. */
295 if ((qp->s_flags & RVT_S_RESP_PENDING) &&
296 make_rc_ack(dev, qp, ohdr, ps))
297 return 1;
298
299 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
300 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
301 goto bail;
302 /* We are in the error state, flush the work request. */
303 if (qp->s_last == READ_ONCE(qp->s_head))
304 goto bail;
305 /* If DMAs are in progress, we can't flush immediately. */
306 if (iowait_sdma_pending(&priv->s_iowait)) {
307 qp->s_flags |= RVT_S_WAIT_DMA;
308 goto bail;
309 }
310 clear_ahg(qp);
311 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
312 hfi1_send_complete(qp, wqe, qp->s_last != qp->s_acked ?
313 IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR);
314 /* will get called again */
315 goto done_free_tx;
316 }
317
318 if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK))
319 goto bail;
320
321 if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) {
322 if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) {
323 qp->s_flags |= RVT_S_WAIT_PSN;
324 goto bail;
325 }
326 qp->s_sending_psn = qp->s_psn;
327 qp->s_sending_hpsn = qp->s_psn - 1;
328 }
329
330 /* Send a request. */
331 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
332 switch (qp->s_state) {
333 default:
334 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK))
335 goto bail;
336 /*
337 * Resend an old request or start a new one.
338 *
339 * We keep track of the current SWQE so that
340 * we don't reset the "furthest progress" state
341 * if we need to back up.
342 */
343 newreq = 0;
344 if (qp->s_cur == qp->s_tail) {
345 /* Check if send work queue is empty. */
346 if (qp->s_tail == READ_ONCE(qp->s_head)) {
347 clear_ahg(qp);
348 goto bail;
349 }
350 /*
351 * If a fence is requested, wait for previous
352 * RDMA read and atomic operations to finish.
353 */
354 if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
355 qp->s_num_rd_atomic) {
356 qp->s_flags |= RVT_S_WAIT_FENCE;
357 goto bail;
358 }
359 /*
360 * Local operations are processed immediately
361 * after all prior requests have completed
362 */
363 if (wqe->wr.opcode == IB_WR_REG_MR ||
364 wqe->wr.opcode == IB_WR_LOCAL_INV) {
365 int local_ops = 0;
366 int err = 0;
367
368 if (qp->s_last != qp->s_cur)
369 goto bail;
370 if (++qp->s_cur == qp->s_size)
371 qp->s_cur = 0;
372 if (++qp->s_tail == qp->s_size)
373 qp->s_tail = 0;
374 if (!(wqe->wr.send_flags &
375 RVT_SEND_COMPLETION_ONLY)) {
376 err = rvt_invalidate_rkey(
377 qp,
378 wqe->wr.ex.invalidate_rkey);
379 local_ops = 1;
380 }
381 hfi1_send_complete(qp, wqe,
382 err ? IB_WC_LOC_PROT_ERR
383 : IB_WC_SUCCESS);
384 if (local_ops)
385 atomic_dec(&qp->local_ops_pending);
386 goto done_free_tx;
387 }
388
389 newreq = 1;
390 qp->s_psn = wqe->psn;
391 }
392 /*
393 * Note that we have to be careful not to modify the
394 * original work request since we may need to resend
395 * it.
396 */
397 len = wqe->length;
398 ss = &qp->s_sge;
399 bth2 = mask_psn(qp->s_psn);
400 switch (wqe->wr.opcode) {
401 case IB_WR_SEND:
402 case IB_WR_SEND_WITH_IMM:
403 case IB_WR_SEND_WITH_INV:
404 /* If no credit, return. */
405 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) &&
406 rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) {
407 qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
408 goto bail;
409 }
410 if (len > pmtu) {
411 qp->s_state = OP(SEND_FIRST);
412 len = pmtu;
413 break;
414 }
415 if (wqe->wr.opcode == IB_WR_SEND) {
416 qp->s_state = OP(SEND_ONLY);
417 } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
418 qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE);
419 /* Immediate data comes after the BTH */
420 ohdr->u.imm_data = wqe->wr.ex.imm_data;
421 hwords += 1;
422 } else {
423 qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE);
424 /* Invalidate rkey comes after the BTH */
425 ohdr->u.ieth = cpu_to_be32(
426 wqe->wr.ex.invalidate_rkey);
427 hwords += 1;
428 }
429 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
430 bth0 |= IB_BTH_SOLICITED;
431 bth2 |= IB_BTH_REQ_ACK;
432 if (++qp->s_cur == qp->s_size)
433 qp->s_cur = 0;
434 break;
435
436 case IB_WR_RDMA_WRITE:
437 if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
438 qp->s_lsn++;
439 goto no_flow_control;
440 case IB_WR_RDMA_WRITE_WITH_IMM:
441 /* If no credit, return. */
442 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) &&
443 rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) {
444 qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
445 goto bail;
446 }
447 no_flow_control:
448 put_ib_reth_vaddr(
449 wqe->rdma_wr.remote_addr,
450 &ohdr->u.rc.reth);
451 ohdr->u.rc.reth.rkey =
452 cpu_to_be32(wqe->rdma_wr.rkey);
453 ohdr->u.rc.reth.length = cpu_to_be32(len);
454 hwords += sizeof(struct ib_reth) / sizeof(u32);
455 if (len > pmtu) {
456 qp->s_state = OP(RDMA_WRITE_FIRST);
457 len = pmtu;
458 break;
459 }
460 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
461 qp->s_state = OP(RDMA_WRITE_ONLY);
462 } else {
463 qp->s_state =
464 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
465 /* Immediate data comes after RETH */
466 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
467 hwords += 1;
468 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
469 bth0 |= IB_BTH_SOLICITED;
470 }
471 bth2 |= IB_BTH_REQ_ACK;
472 if (++qp->s_cur == qp->s_size)
473 qp->s_cur = 0;
474 break;
475
476 case IB_WR_RDMA_READ:
477 /*
478 * Don't allow more operations to be started
479 * than the QP limits allow.
480 */
481 if (newreq) {
482 if (qp->s_num_rd_atomic >=
483 qp->s_max_rd_atomic) {
484 qp->s_flags |= RVT_S_WAIT_RDMAR;
485 goto bail;
486 }
487 qp->s_num_rd_atomic++;
488 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
489 qp->s_lsn++;
490 }
491 put_ib_reth_vaddr(
492 wqe->rdma_wr.remote_addr,
493 &ohdr->u.rc.reth);
494 ohdr->u.rc.reth.rkey =
495 cpu_to_be32(wqe->rdma_wr.rkey);
496 ohdr->u.rc.reth.length = cpu_to_be32(len);
497 qp->s_state = OP(RDMA_READ_REQUEST);
498 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
499 ss = NULL;
500 len = 0;
501 bth2 |= IB_BTH_REQ_ACK;
502 if (++qp->s_cur == qp->s_size)
503 qp->s_cur = 0;
504 break;
505
506 case IB_WR_ATOMIC_CMP_AND_SWP:
507 case IB_WR_ATOMIC_FETCH_AND_ADD:
508 /*
509 * Don't allow more operations to be started
510 * than the QP limits allow.
511 */
512 if (newreq) {
513 if (qp->s_num_rd_atomic >=
514 qp->s_max_rd_atomic) {
515 qp->s_flags |= RVT_S_WAIT_RDMAR;
516 goto bail;
517 }
518 qp->s_num_rd_atomic++;
519 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
520 qp->s_lsn++;
521 }
522 if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
523 qp->s_state = OP(COMPARE_SWAP);
524 put_ib_ateth_swap(wqe->atomic_wr.swap,
525 &ohdr->u.atomic_eth);
526 put_ib_ateth_compare(wqe->atomic_wr.compare_add,
527 &ohdr->u.atomic_eth);
528 } else {
529 qp->s_state = OP(FETCH_ADD);
530 put_ib_ateth_swap(wqe->atomic_wr.compare_add,
531 &ohdr->u.atomic_eth);
532 put_ib_ateth_compare(0, &ohdr->u.atomic_eth);
533 }
534 put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr,
535 &ohdr->u.atomic_eth);
536 ohdr->u.atomic_eth.rkey = cpu_to_be32(
537 wqe->atomic_wr.rkey);
538 hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
539 ss = NULL;
540 len = 0;
541 bth2 |= IB_BTH_REQ_ACK;
542 if (++qp->s_cur == qp->s_size)
543 qp->s_cur = 0;
544 break;
545
546 default:
547 goto bail;
548 }
549 qp->s_sge.sge = wqe->sg_list[0];
550 qp->s_sge.sg_list = wqe->sg_list + 1;
551 qp->s_sge.num_sge = wqe->wr.num_sge;
552 qp->s_sge.total_len = wqe->length;
553 qp->s_len = wqe->length;
554 if (newreq) {
555 qp->s_tail++;
556 if (qp->s_tail >= qp->s_size)
557 qp->s_tail = 0;
558 }
559 if (wqe->wr.opcode == IB_WR_RDMA_READ)
560 qp->s_psn = wqe->lpsn + 1;
561 else
562 qp->s_psn++;
563 break;
564
565 case OP(RDMA_READ_RESPONSE_FIRST):
566 /*
567 * qp->s_state is normally set to the opcode of the
568 * last packet constructed for new requests and therefore
569 * is never set to RDMA read response.
570 * RDMA_READ_RESPONSE_FIRST is used by the ACK processing
571 * thread to indicate a SEND needs to be restarted from an
572 * earlier PSN without interfering with the sending thread.
573 * See restart_rc().
574 */
575 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
576 /* FALLTHROUGH */
577 case OP(SEND_FIRST):
578 qp->s_state = OP(SEND_MIDDLE);
579 /* FALLTHROUGH */
580 case OP(SEND_MIDDLE):
581 bth2 = mask_psn(qp->s_psn++);
582 ss = &qp->s_sge;
583 len = qp->s_len;
584 if (len > pmtu) {
585 len = pmtu;
586 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
587 break;
588 }
589 if (wqe->wr.opcode == IB_WR_SEND) {
590 qp->s_state = OP(SEND_LAST);
591 } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
592 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
593 /* Immediate data comes after the BTH */
594 ohdr->u.imm_data = wqe->wr.ex.imm_data;
595 hwords += 1;
596 } else {
597 qp->s_state = OP(SEND_LAST_WITH_INVALIDATE);
598 /* invalidate data comes after the BTH */
599 ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey);
600 hwords += 1;
601 }
602 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
603 bth0 |= IB_BTH_SOLICITED;
604 bth2 |= IB_BTH_REQ_ACK;
605 qp->s_cur++;
606 if (qp->s_cur >= qp->s_size)
607 qp->s_cur = 0;
608 break;
609
610 case OP(RDMA_READ_RESPONSE_LAST):
611 /*
612 * qp->s_state is normally set to the opcode of the
613 * last packet constructed for new requests and therefore
614 * is never set to RDMA read response.
615 * RDMA_READ_RESPONSE_LAST is used by the ACK processing
616 * thread to indicate a RDMA write needs to be restarted from
617 * an earlier PSN without interfering with the sending thread.
618 * See restart_rc().
619 */
620 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
621 /* FALLTHROUGH */
622 case OP(RDMA_WRITE_FIRST):
623 qp->s_state = OP(RDMA_WRITE_MIDDLE);
624 /* FALLTHROUGH */
625 case OP(RDMA_WRITE_MIDDLE):
626 bth2 = mask_psn(qp->s_psn++);
627 ss = &qp->s_sge;
628 len = qp->s_len;
629 if (len > pmtu) {
630 len = pmtu;
631 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
632 break;
633 }
634 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
635 qp->s_state = OP(RDMA_WRITE_LAST);
636 } else {
637 qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
638 /* Immediate data comes after the BTH */
639 ohdr->u.imm_data = wqe->wr.ex.imm_data;
640 hwords += 1;
641 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
642 bth0 |= IB_BTH_SOLICITED;
643 }
644 bth2 |= IB_BTH_REQ_ACK;
645 qp->s_cur++;
646 if (qp->s_cur >= qp->s_size)
647 qp->s_cur = 0;
648 break;
649
650 case OP(RDMA_READ_RESPONSE_MIDDLE):
651 /*
652 * qp->s_state is normally set to the opcode of the
653 * last packet constructed for new requests and therefore
654 * is never set to RDMA read response.
655 * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing
656 * thread to indicate a RDMA read needs to be restarted from
657 * an earlier PSN without interfering with the sending thread.
658 * See restart_rc().
659 */
660 len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu;
661 put_ib_reth_vaddr(
662 wqe->rdma_wr.remote_addr + len,
663 &ohdr->u.rc.reth);
664 ohdr->u.rc.reth.rkey =
665 cpu_to_be32(wqe->rdma_wr.rkey);
666 ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len);
667 qp->s_state = OP(RDMA_READ_REQUEST);
668 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
669 bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK;
670 qp->s_psn = wqe->lpsn + 1;
671 ss = NULL;
672 len = 0;
673 qp->s_cur++;
674 if (qp->s_cur == qp->s_size)
675 qp->s_cur = 0;
676 break;
677 }
678 qp->s_sending_hpsn = bth2;
679 delta = delta_psn(bth2, wqe->psn);
680 if (delta && delta % HFI1_PSN_CREDIT == 0)
681 bth2 |= IB_BTH_REQ_ACK;
682 if (qp->s_flags & RVT_S_SEND_ONE) {
683 qp->s_flags &= ~RVT_S_SEND_ONE;
684 qp->s_flags |= RVT_S_WAIT_ACK;
685 bth2 |= IB_BTH_REQ_ACK;
686 }
687 qp->s_len -= len;
688 ps->s_txreq->hdr_dwords = hwords;
689 ps->s_txreq->sde = priv->s_sde;
690 ps->s_txreq->ss = ss;
691 ps->s_txreq->s_cur_size = len;
692 hfi1_make_ruc_header(
693 qp,
694 ohdr,
695 bth0 | (qp->s_state << 24),
696 bth2,
697 middle,
698 ps);
699 return 1;
700
701 done_free_tx:
702 hfi1_put_txreq(ps->s_txreq);
703 ps->s_txreq = NULL;
704 return 1;
705
706 bail:
707 hfi1_put_txreq(ps->s_txreq);
708
709 bail_no_tx:
710 ps->s_txreq = NULL;
711 qp->s_flags &= ~RVT_S_BUSY;
712 return 0;
713 }
714
715 static inline void hfi1_make_bth_aeth(struct rvt_qp *qp,
716 struct ib_other_headers *ohdr,
717 u32 bth0, u32 bth1)
718 {
719 if (qp->r_nak_state)
720 ohdr->u.aeth = cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
721 (qp->r_nak_state <<
722 IB_AETH_CREDIT_SHIFT));
723 else
724 ohdr->u.aeth = rvt_compute_aeth(qp);
725
726 ohdr->bth[0] = cpu_to_be32(bth0);
727 ohdr->bth[1] = cpu_to_be32(bth1 | qp->remote_qpn);
728 ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn));
729 }
730
731 static inline void hfi1_queue_rc_ack(struct hfi1_packet *packet, bool is_fecn)
732 {
733 struct rvt_qp *qp = packet->qp;
734 struct hfi1_ibport *ibp;
735 unsigned long flags;
736
737 spin_lock_irqsave(&qp->s_lock, flags);
738 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
739 goto unlock;
740 ibp = rcd_to_iport(packet->rcd);
741 this_cpu_inc(*ibp->rvp.rc_qacks);
742 qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING;
743 qp->s_nak_state = qp->r_nak_state;
744 qp->s_ack_psn = qp->r_ack_psn;
745 if (is_fecn)
746 qp->s_flags |= RVT_S_ECN;
747
748 /* Schedule the send tasklet. */
749 hfi1_schedule_send(qp);
750 unlock:
751 spin_unlock_irqrestore(&qp->s_lock, flags);
752 }
753
754 static inline void hfi1_make_rc_ack_9B(struct hfi1_packet *packet,
755 struct hfi1_opa_header *opa_hdr,
756 u8 sc5, bool is_fecn,
757 u64 *pbc_flags, u32 *hwords,
758 u32 *nwords)
759 {
760 struct rvt_qp *qp = packet->qp;
761 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
762 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
763 struct ib_header *hdr = &opa_hdr->ibh;
764 struct ib_other_headers *ohdr;
765 u16 lrh0 = HFI1_LRH_BTH;
766 u16 pkey;
767 u32 bth0, bth1;
768
769 opa_hdr->hdr_type = HFI1_PKT_TYPE_9B;
770 ohdr = &hdr->u.oth;
771 /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */
772 *hwords = 6;
773
774 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
775 *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh,
776 rdma_ah_read_grh(&qp->remote_ah_attr),
777 *hwords - 2, SIZE_OF_CRC);
778 ohdr = &hdr->u.l.oth;
779 lrh0 = HFI1_LRH_GRH;
780 }
781 /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */
782 *pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT);
783
784 /* read pkey_index w/o lock (its atomic) */
785 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
786
787 lrh0 |= (sc5 & IB_SC_MASK) << IB_SC_SHIFT |
788 (rdma_ah_get_sl(&qp->remote_ah_attr) & IB_SL_MASK) <<
789 IB_SL_SHIFT;
790
791 hfi1_make_ib_hdr(hdr, lrh0, *hwords + SIZE_OF_CRC,
792 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B),
793 ppd->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr));
794
795 bth0 = pkey | (OP(ACKNOWLEDGE) << 24);
796 if (qp->s_mig_state == IB_MIG_MIGRATED)
797 bth0 |= IB_BTH_MIG_REQ;
798 bth1 = (!!is_fecn) << IB_BECN_SHIFT;
799 hfi1_make_bth_aeth(qp, ohdr, bth0, bth1);
800 }
801
802 static inline void hfi1_make_rc_ack_16B(struct hfi1_packet *packet,
803 struct hfi1_opa_header *opa_hdr,
804 u8 sc5, bool is_fecn,
805 u64 *pbc_flags, u32 *hwords,
806 u32 *nwords)
807 {
808 struct rvt_qp *qp = packet->qp;
809 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
810 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
811 struct hfi1_16b_header *hdr = &opa_hdr->opah;
812 struct ib_other_headers *ohdr;
813 u32 bth0, bth1 = 0;
814 u16 len, pkey;
815 bool becn = is_fecn;
816 u8 l4 = OPA_16B_L4_IB_LOCAL;
817 u8 extra_bytes;
818
819 opa_hdr->hdr_type = HFI1_PKT_TYPE_16B;
820 ohdr = &hdr->u.oth;
821 /* header size in 32-bit words 16B LRH+BTH+AETH = (16+12+4)/4 */
822 *hwords = 8;
823 extra_bytes = hfi1_get_16b_padding(*hwords << 2, 0);
824 *nwords = SIZE_OF_CRC + ((extra_bytes + SIZE_OF_LT) >> 2);
825
826 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
827 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) {
828 *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh,
829 rdma_ah_read_grh(&qp->remote_ah_attr),
830 *hwords - 4, *nwords);
831 ohdr = &hdr->u.l.oth;
832 l4 = OPA_16B_L4_IB_GLOBAL;
833 }
834 *pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
835
836 /* read pkey_index w/o lock (its atomic) */
837 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
838
839 /* Convert dwords to flits */
840 len = (*hwords + *nwords) >> 1;
841
842 hfi1_make_16b_hdr(hdr, ppd->lid |
843 (rdma_ah_get_path_bits(&qp->remote_ah_attr) &
844 ((1 << ppd->lmc) - 1)),
845 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr),
846 16B), len, pkey, becn, 0, l4, sc5);
847
848 bth0 = pkey | (OP(ACKNOWLEDGE) << 24);
849 bth0 |= extra_bytes << 20;
850 if (qp->s_mig_state == IB_MIG_MIGRATED)
851 bth1 = OPA_BTH_MIG_REQ;
852 hfi1_make_bth_aeth(qp, ohdr, bth0, bth1);
853 }
854
855 typedef void (*hfi1_make_rc_ack)(struct hfi1_packet *packet,
856 struct hfi1_opa_header *opa_hdr,
857 u8 sc5, bool is_fecn,
858 u64 *pbc_flags, u32 *hwords,
859 u32 *nwords);
860
861 /* We support only two types - 9B and 16B for now */
862 static const hfi1_make_rc_ack hfi1_make_rc_ack_tbl[2] = {
863 [HFI1_PKT_TYPE_9B] = &hfi1_make_rc_ack_9B,
864 [HFI1_PKT_TYPE_16B] = &hfi1_make_rc_ack_16B
865 };
866
867 /**
868 * hfi1_send_rc_ack - Construct an ACK packet and send it
869 * @qp: a pointer to the QP
870 *
871 * This is called from hfi1_rc_rcv() and handle_receive_interrupt().
872 * Note that RDMA reads and atomics are handled in the
873 * send side QP state and send engine.
874 */
875 void hfi1_send_rc_ack(struct hfi1_packet *packet, bool is_fecn)
876 {
877 struct hfi1_ctxtdata *rcd = packet->rcd;
878 struct rvt_qp *qp = packet->qp;
879 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
880 struct hfi1_qp_priv *priv = qp->priv;
881 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
882 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
883 u64 pbc, pbc_flags = 0;
884 u32 hwords = 0;
885 u32 nwords = 0;
886 u32 plen;
887 struct pio_buf *pbuf;
888 struct hfi1_opa_header opa_hdr;
889
890 /* clear the defer count */
891 qp->r_adefered = 0;
892
893 /* Don't send ACK or NAK if a RDMA read or atomic is pending. */
894 if (qp->s_flags & RVT_S_RESP_PENDING) {
895 hfi1_queue_rc_ack(packet, is_fecn);
896 return;
897 }
898
899 /* Ensure s_rdma_ack_cnt changes are committed */
900 if (qp->s_rdma_ack_cnt) {
901 hfi1_queue_rc_ack(packet, is_fecn);
902 return;
903 }
904
905 /* Don't try to send ACKs if the link isn't ACTIVE */
906 if (driver_lstate(ppd) != IB_PORT_ACTIVE)
907 return;
908
909 /* Make the appropriate header */
910 hfi1_make_rc_ack_tbl[priv->hdr_type](packet, &opa_hdr, sc5, is_fecn,
911 &pbc_flags, &hwords, &nwords);
912
913 plen = 2 /* PBC */ + hwords + nwords;
914 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps,
915 sc_to_vlt(ppd->dd, sc5), plen);
916 pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL);
917 if (!pbuf) {
918 /*
919 * We have no room to send at the moment. Pass
920 * responsibility for sending the ACK to the send engine
921 * so that when enough buffer space becomes available,
922 * the ACK is sent ahead of other outgoing packets.
923 */
924 hfi1_queue_rc_ack(packet, is_fecn);
925 return;
926 }
927 trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
928 &opa_hdr, ib_is_sc5(sc5));
929
930 /* write the pbc and data */
931 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
932 (priv->hdr_type == HFI1_PKT_TYPE_9B ?
933 (void *)&opa_hdr.ibh :
934 (void *)&opa_hdr.opah), hwords);
935 return;
936 }
937
938 /**
939 * reset_psn - reset the QP state to send starting from PSN
940 * @qp: the QP
941 * @psn: the packet sequence number to restart at
942 *
943 * This is called from hfi1_rc_rcv() to process an incoming RC ACK
944 * for the given QP.
945 * Called at interrupt level with the QP s_lock held.
946 */
947 static void reset_psn(struct rvt_qp *qp, u32 psn)
948 {
949 u32 n = qp->s_acked;
950 struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n);
951 u32 opcode;
952
953 lockdep_assert_held(&qp->s_lock);
954 qp->s_cur = n;
955
956 /*
957 * If we are starting the request from the beginning,
958 * let the normal send code handle initialization.
959 */
960 if (cmp_psn(psn, wqe->psn) <= 0) {
961 qp->s_state = OP(SEND_LAST);
962 goto done;
963 }
964
965 /* Find the work request opcode corresponding to the given PSN. */
966 opcode = wqe->wr.opcode;
967 for (;;) {
968 int diff;
969
970 if (++n == qp->s_size)
971 n = 0;
972 if (n == qp->s_tail)
973 break;
974 wqe = rvt_get_swqe_ptr(qp, n);
975 diff = cmp_psn(psn, wqe->psn);
976 if (diff < 0)
977 break;
978 qp->s_cur = n;
979 /*
980 * If we are starting the request from the beginning,
981 * let the normal send code handle initialization.
982 */
983 if (diff == 0) {
984 qp->s_state = OP(SEND_LAST);
985 goto done;
986 }
987 opcode = wqe->wr.opcode;
988 }
989
990 /*
991 * Set the state to restart in the middle of a request.
992 * Don't change the s_sge, s_cur_sge, or s_cur_size.
993 * See hfi1_make_rc_req().
994 */
995 switch (opcode) {
996 case IB_WR_SEND:
997 case IB_WR_SEND_WITH_IMM:
998 qp->s_state = OP(RDMA_READ_RESPONSE_FIRST);
999 break;
1000
1001 case IB_WR_RDMA_WRITE:
1002 case IB_WR_RDMA_WRITE_WITH_IMM:
1003 qp->s_state = OP(RDMA_READ_RESPONSE_LAST);
1004 break;
1005
1006 case IB_WR_RDMA_READ:
1007 qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE);
1008 break;
1009
1010 default:
1011 /*
1012 * This case shouldn't happen since its only
1013 * one PSN per req.
1014 */
1015 qp->s_state = OP(SEND_LAST);
1016 }
1017 done:
1018 qp->s_psn = psn;
1019 /*
1020 * Set RVT_S_WAIT_PSN as rc_complete() may start the timer
1021 * asynchronously before the send engine can get scheduled.
1022 * Doing it in hfi1_make_rc_req() is too late.
1023 */
1024 if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) &&
1025 (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0))
1026 qp->s_flags |= RVT_S_WAIT_PSN;
1027 qp->s_flags &= ~RVT_S_AHG_VALID;
1028 }
1029
1030 /*
1031 * Back up requester to resend the last un-ACKed request.
1032 * The QP r_lock and s_lock should be held and interrupts disabled.
1033 */
1034 void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait)
1035 {
1036 struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1037 struct hfi1_ibport *ibp;
1038
1039 lockdep_assert_held(&qp->r_lock);
1040 lockdep_assert_held(&qp->s_lock);
1041 if (qp->s_retry == 0) {
1042 if (qp->s_mig_state == IB_MIG_ARMED) {
1043 hfi1_migrate_qp(qp);
1044 qp->s_retry = qp->s_retry_cnt;
1045 } else if (qp->s_last == qp->s_acked) {
1046 hfi1_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR);
1047 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1048 return;
1049 } else { /* need to handle delayed completion */
1050 return;
1051 }
1052 } else {
1053 qp->s_retry--;
1054 }
1055
1056 ibp = to_iport(qp->ibqp.device, qp->port_num);
1057 if (wqe->wr.opcode == IB_WR_RDMA_READ)
1058 ibp->rvp.n_rc_resends++;
1059 else
1060 ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn);
1061
1062 qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR |
1063 RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN |
1064 RVT_S_WAIT_ACK);
1065 if (wait)
1066 qp->s_flags |= RVT_S_SEND_ONE;
1067 reset_psn(qp, psn);
1068 }
1069
1070 /*
1071 * Set qp->s_sending_psn to the next PSN after the given one.
1072 * This would be psn+1 except when RDMA reads are present.
1073 */
1074 static void reset_sending_psn(struct rvt_qp *qp, u32 psn)
1075 {
1076 struct rvt_swqe *wqe;
1077 u32 n = qp->s_last;
1078
1079 lockdep_assert_held(&qp->s_lock);
1080 /* Find the work request corresponding to the given PSN. */
1081 for (;;) {
1082 wqe = rvt_get_swqe_ptr(qp, n);
1083 if (cmp_psn(psn, wqe->lpsn) <= 0) {
1084 if (wqe->wr.opcode == IB_WR_RDMA_READ)
1085 qp->s_sending_psn = wqe->lpsn + 1;
1086 else
1087 qp->s_sending_psn = psn + 1;
1088 break;
1089 }
1090 if (++n == qp->s_size)
1091 n = 0;
1092 if (n == qp->s_tail)
1093 break;
1094 }
1095 }
1096
1097 /*
1098 * This should be called with the QP s_lock held and interrupts disabled.
1099 */
1100 void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah)
1101 {
1102 struct ib_other_headers *ohdr;
1103 struct hfi1_qp_priv *priv = qp->priv;
1104 struct rvt_swqe *wqe;
1105 struct ib_header *hdr = NULL;
1106 struct hfi1_16b_header *hdr_16b = NULL;
1107 u32 opcode;
1108 u32 psn;
1109
1110 lockdep_assert_held(&qp->s_lock);
1111 if (!(ib_rvt_state_ops[qp->state] & RVT_SEND_OR_FLUSH_OR_RECV_OK))
1112 return;
1113
1114 /* Find out where the BTH is */
1115 if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
1116 hdr = &opah->ibh;
1117 if (ib_get_lnh(hdr) == HFI1_LRH_BTH)
1118 ohdr = &hdr->u.oth;
1119 else
1120 ohdr = &hdr->u.l.oth;
1121 } else {
1122 u8 l4;
1123
1124 hdr_16b = &opah->opah;
1125 l4 = hfi1_16B_get_l4(hdr_16b);
1126 if (l4 == OPA_16B_L4_IB_LOCAL)
1127 ohdr = &hdr_16b->u.oth;
1128 else
1129 ohdr = &hdr_16b->u.l.oth;
1130 }
1131
1132 opcode = ib_bth_get_opcode(ohdr);
1133 if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
1134 opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
1135 WARN_ON(!qp->s_rdma_ack_cnt);
1136 qp->s_rdma_ack_cnt--;
1137 return;
1138 }
1139
1140 psn = ib_bth_get_psn(ohdr);
1141 reset_sending_psn(qp, psn);
1142
1143 /*
1144 * Start timer after a packet requesting an ACK has been sent and
1145 * there are still requests that haven't been acked.
1146 */
1147 if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail &&
1148 !(qp->s_flags &
1149 (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) &&
1150 (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
1151 rvt_add_retry_timer(qp);
1152
1153 while (qp->s_last != qp->s_acked) {
1154 u32 s_last;
1155
1156 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
1157 if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 &&
1158 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)
1159 break;
1160 s_last = qp->s_last;
1161 trace_hfi1_qp_send_completion(qp, wqe, s_last);
1162 if (++s_last >= qp->s_size)
1163 s_last = 0;
1164 qp->s_last = s_last;
1165 /* see post_send() */
1166 barrier();
1167 rvt_put_swqe(wqe);
1168 rvt_qp_swqe_complete(qp,
1169 wqe,
1170 ib_hfi1_wc_opcode[wqe->wr.opcode],
1171 IB_WC_SUCCESS);
1172 }
1173 /*
1174 * If we were waiting for sends to complete before re-sending,
1175 * and they are now complete, restart sending.
1176 */
1177 trace_hfi1_sendcomplete(qp, psn);
1178 if (qp->s_flags & RVT_S_WAIT_PSN &&
1179 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1180 qp->s_flags &= ~RVT_S_WAIT_PSN;
1181 qp->s_sending_psn = qp->s_psn;
1182 qp->s_sending_hpsn = qp->s_psn - 1;
1183 hfi1_schedule_send(qp);
1184 }
1185 }
1186
1187 static inline void update_last_psn(struct rvt_qp *qp, u32 psn)
1188 {
1189 qp->s_last_psn = psn;
1190 }
1191
1192 /*
1193 * Generate a SWQE completion.
1194 * This is similar to hfi1_send_complete but has to check to be sure
1195 * that the SGEs are not being referenced if the SWQE is being resent.
1196 */
1197 static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp,
1198 struct rvt_swqe *wqe,
1199 struct hfi1_ibport *ibp)
1200 {
1201 lockdep_assert_held(&qp->s_lock);
1202 /*
1203 * Don't decrement refcount and don't generate a
1204 * completion if the SWQE is being resent until the send
1205 * is finished.
1206 */
1207 if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 ||
1208 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1209 u32 s_last;
1210
1211 rvt_put_swqe(wqe);
1212 s_last = qp->s_last;
1213 trace_hfi1_qp_send_completion(qp, wqe, s_last);
1214 if (++s_last >= qp->s_size)
1215 s_last = 0;
1216 qp->s_last = s_last;
1217 /* see post_send() */
1218 barrier();
1219 rvt_qp_swqe_complete(qp,
1220 wqe,
1221 ib_hfi1_wc_opcode[wqe->wr.opcode],
1222 IB_WC_SUCCESS);
1223 } else {
1224 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
1225
1226 this_cpu_inc(*ibp->rvp.rc_delayed_comp);
1227 /*
1228 * If send progress not running attempt to progress
1229 * SDMA queue.
1230 */
1231 if (ppd->dd->flags & HFI1_HAS_SEND_DMA) {
1232 struct sdma_engine *engine;
1233 u8 sl = rdma_ah_get_sl(&qp->remote_ah_attr);
1234 u8 sc5;
1235
1236 /* For now use sc to find engine */
1237 sc5 = ibp->sl_to_sc[sl];
1238 engine = qp_to_sdma_engine(qp, sc5);
1239 sdma_engine_progress_schedule(engine);
1240 }
1241 }
1242
1243 qp->s_retry = qp->s_retry_cnt;
1244 update_last_psn(qp, wqe->lpsn);
1245
1246 /*
1247 * If we are completing a request which is in the process of
1248 * being resent, we can stop re-sending it since we know the
1249 * responder has already seen it.
1250 */
1251 if (qp->s_acked == qp->s_cur) {
1252 if (++qp->s_cur >= qp->s_size)
1253 qp->s_cur = 0;
1254 qp->s_acked = qp->s_cur;
1255 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
1256 if (qp->s_acked != qp->s_tail) {
1257 qp->s_state = OP(SEND_LAST);
1258 qp->s_psn = wqe->psn;
1259 }
1260 } else {
1261 if (++qp->s_acked >= qp->s_size)
1262 qp->s_acked = 0;
1263 if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur)
1264 qp->s_draining = 0;
1265 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1266 }
1267 return wqe;
1268 }
1269
1270 /**
1271 * do_rc_ack - process an incoming RC ACK
1272 * @qp: the QP the ACK came in on
1273 * @psn: the packet sequence number of the ACK
1274 * @opcode: the opcode of the request that resulted in the ACK
1275 *
1276 * This is called from rc_rcv_resp() to process an incoming RC ACK
1277 * for the given QP.
1278 * May be called at interrupt level, with the QP s_lock held.
1279 * Returns 1 if OK, 0 if current operation should be aborted (NAK).
1280 */
1281 static int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode,
1282 u64 val, struct hfi1_ctxtdata *rcd)
1283 {
1284 struct hfi1_ibport *ibp;
1285 enum ib_wc_status status;
1286 struct rvt_swqe *wqe;
1287 int ret = 0;
1288 u32 ack_psn;
1289 int diff;
1290
1291 lockdep_assert_held(&qp->s_lock);
1292 /*
1293 * Note that NAKs implicitly ACK outstanding SEND and RDMA write
1294 * requests and implicitly NAK RDMA read and atomic requests issued
1295 * before the NAK'ed request. The MSN won't include the NAK'ed
1296 * request but will include an ACK'ed request(s).
1297 */
1298 ack_psn = psn;
1299 if (aeth >> IB_AETH_NAK_SHIFT)
1300 ack_psn--;
1301 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1302 ibp = rcd_to_iport(rcd);
1303
1304 /*
1305 * The MSN might be for a later WQE than the PSN indicates so
1306 * only complete WQEs that the PSN finishes.
1307 */
1308 while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) {
1309 /*
1310 * RDMA_READ_RESPONSE_ONLY is a special case since
1311 * we want to generate completion events for everything
1312 * before the RDMA read, copy the data, then generate
1313 * the completion for the read.
1314 */
1315 if (wqe->wr.opcode == IB_WR_RDMA_READ &&
1316 opcode == OP(RDMA_READ_RESPONSE_ONLY) &&
1317 diff == 0) {
1318 ret = 1;
1319 goto bail_stop;
1320 }
1321 /*
1322 * If this request is a RDMA read or atomic, and the ACK is
1323 * for a later operation, this ACK NAKs the RDMA read or
1324 * atomic. In other words, only a RDMA_READ_LAST or ONLY
1325 * can ACK a RDMA read and likewise for atomic ops. Note
1326 * that the NAK case can only happen if relaxed ordering is
1327 * used and requests are sent after an RDMA read or atomic
1328 * is sent but before the response is received.
1329 */
1330 if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
1331 (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) ||
1332 ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1333 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
1334 (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) {
1335 /* Retry this request. */
1336 if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) {
1337 qp->r_flags |= RVT_R_RDMAR_SEQ;
1338 hfi1_restart_rc(qp, qp->s_last_psn + 1, 0);
1339 if (list_empty(&qp->rspwait)) {
1340 qp->r_flags |= RVT_R_RSP_SEND;
1341 rvt_get_qp(qp);
1342 list_add_tail(&qp->rspwait,
1343 &rcd->qp_wait_list);
1344 }
1345 }
1346 /*
1347 * No need to process the ACK/NAK since we are
1348 * restarting an earlier request.
1349 */
1350 goto bail_stop;
1351 }
1352 if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1353 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
1354 u64 *vaddr = wqe->sg_list[0].vaddr;
1355 *vaddr = val;
1356 }
1357 if (qp->s_num_rd_atomic &&
1358 (wqe->wr.opcode == IB_WR_RDMA_READ ||
1359 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1360 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) {
1361 qp->s_num_rd_atomic--;
1362 /* Restart sending task if fence is complete */
1363 if ((qp->s_flags & RVT_S_WAIT_FENCE) &&
1364 !qp->s_num_rd_atomic) {
1365 qp->s_flags &= ~(RVT_S_WAIT_FENCE |
1366 RVT_S_WAIT_ACK);
1367 hfi1_schedule_send(qp);
1368 } else if (qp->s_flags & RVT_S_WAIT_RDMAR) {
1369 qp->s_flags &= ~(RVT_S_WAIT_RDMAR |
1370 RVT_S_WAIT_ACK);
1371 hfi1_schedule_send(qp);
1372 }
1373 }
1374 wqe = do_rc_completion(qp, wqe, ibp);
1375 if (qp->s_acked == qp->s_tail)
1376 break;
1377 }
1378
1379 switch (aeth >> IB_AETH_NAK_SHIFT) {
1380 case 0: /* ACK */
1381 this_cpu_inc(*ibp->rvp.rc_acks);
1382 if (qp->s_acked != qp->s_tail) {
1383 /*
1384 * We are expecting more ACKs so
1385 * mod the retry timer.
1386 */
1387 rvt_mod_retry_timer(qp);
1388 /*
1389 * We can stop re-sending the earlier packets and
1390 * continue with the next packet the receiver wants.
1391 */
1392 if (cmp_psn(qp->s_psn, psn) <= 0)
1393 reset_psn(qp, psn + 1);
1394 } else {
1395 /* No more acks - kill all timers */
1396 rvt_stop_rc_timers(qp);
1397 if (cmp_psn(qp->s_psn, psn) <= 0) {
1398 qp->s_state = OP(SEND_LAST);
1399 qp->s_psn = psn + 1;
1400 }
1401 }
1402 if (qp->s_flags & RVT_S_WAIT_ACK) {
1403 qp->s_flags &= ~RVT_S_WAIT_ACK;
1404 hfi1_schedule_send(qp);
1405 }
1406 rvt_get_credit(qp, aeth);
1407 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
1408 qp->s_retry = qp->s_retry_cnt;
1409 update_last_psn(qp, psn);
1410 return 1;
1411
1412 case 1: /* RNR NAK */
1413 ibp->rvp.n_rnr_naks++;
1414 if (qp->s_acked == qp->s_tail)
1415 goto bail_stop;
1416 if (qp->s_flags & RVT_S_WAIT_RNR)
1417 goto bail_stop;
1418 if (qp->s_rnr_retry == 0) {
1419 status = IB_WC_RNR_RETRY_EXC_ERR;
1420 goto class_b;
1421 }
1422 if (qp->s_rnr_retry_cnt < 7)
1423 qp->s_rnr_retry--;
1424
1425 /* The last valid PSN is the previous PSN. */
1426 update_last_psn(qp, psn - 1);
1427
1428 ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn);
1429
1430 reset_psn(qp, psn);
1431
1432 qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK);
1433 rvt_stop_rc_timers(qp);
1434 rvt_add_rnr_timer(qp, aeth);
1435 return 0;
1436
1437 case 3: /* NAK */
1438 if (qp->s_acked == qp->s_tail)
1439 goto bail_stop;
1440 /* The last valid PSN is the previous PSN. */
1441 update_last_psn(qp, psn - 1);
1442 switch ((aeth >> IB_AETH_CREDIT_SHIFT) &
1443 IB_AETH_CREDIT_MASK) {
1444 case 0: /* PSN sequence error */
1445 ibp->rvp.n_seq_naks++;
1446 /*
1447 * Back up to the responder's expected PSN.
1448 * Note that we might get a NAK in the middle of an
1449 * RDMA READ response which terminates the RDMA
1450 * READ.
1451 */
1452 hfi1_restart_rc(qp, psn, 0);
1453 hfi1_schedule_send(qp);
1454 break;
1455
1456 case 1: /* Invalid Request */
1457 status = IB_WC_REM_INV_REQ_ERR;
1458 ibp->rvp.n_other_naks++;
1459 goto class_b;
1460
1461 case 2: /* Remote Access Error */
1462 status = IB_WC_REM_ACCESS_ERR;
1463 ibp->rvp.n_other_naks++;
1464 goto class_b;
1465
1466 case 3: /* Remote Operation Error */
1467 status = IB_WC_REM_OP_ERR;
1468 ibp->rvp.n_other_naks++;
1469 class_b:
1470 if (qp->s_last == qp->s_acked) {
1471 hfi1_send_complete(qp, wqe, status);
1472 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1473 }
1474 break;
1475
1476 default:
1477 /* Ignore other reserved NAK error codes */
1478 goto reserved;
1479 }
1480 qp->s_retry = qp->s_retry_cnt;
1481 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
1482 goto bail_stop;
1483
1484 default: /* 2: reserved */
1485 reserved:
1486 /* Ignore reserved NAK codes. */
1487 goto bail_stop;
1488 }
1489 /* cannot be reached */
1490 bail_stop:
1491 rvt_stop_rc_timers(qp);
1492 return ret;
1493 }
1494
1495 /*
1496 * We have seen an out of sequence RDMA read middle or last packet.
1497 * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE.
1498 */
1499 static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn,
1500 struct hfi1_ctxtdata *rcd)
1501 {
1502 struct rvt_swqe *wqe;
1503
1504 lockdep_assert_held(&qp->s_lock);
1505 /* Remove QP from retry timer */
1506 rvt_stop_rc_timers(qp);
1507
1508 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1509
1510 while (cmp_psn(psn, wqe->lpsn) > 0) {
1511 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
1512 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1513 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
1514 break;
1515 wqe = do_rc_completion(qp, wqe, ibp);
1516 }
1517
1518 ibp->rvp.n_rdma_seq++;
1519 qp->r_flags |= RVT_R_RDMAR_SEQ;
1520 hfi1_restart_rc(qp, qp->s_last_psn + 1, 0);
1521 if (list_empty(&qp->rspwait)) {
1522 qp->r_flags |= RVT_R_RSP_SEND;
1523 rvt_get_qp(qp);
1524 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
1525 }
1526 }
1527
1528 /**
1529 * rc_rcv_resp - process an incoming RC response packet
1530 * @packet: data packet information
1531 *
1532 * This is called from hfi1_rc_rcv() to process an incoming RC response
1533 * packet for the given QP.
1534 * Called at interrupt level.
1535 */
1536 static void rc_rcv_resp(struct hfi1_packet *packet)
1537 {
1538 struct hfi1_ctxtdata *rcd = packet->rcd;
1539 void *data = packet->payload;
1540 u32 tlen = packet->tlen;
1541 struct rvt_qp *qp = packet->qp;
1542 struct hfi1_ibport *ibp;
1543 struct ib_other_headers *ohdr = packet->ohdr;
1544 struct rvt_swqe *wqe;
1545 enum ib_wc_status status;
1546 unsigned long flags;
1547 int diff;
1548 u64 val;
1549 u32 aeth;
1550 u32 psn = ib_bth_get_psn(packet->ohdr);
1551 u32 pmtu = qp->pmtu;
1552 u16 hdrsize = packet->hlen;
1553 u8 opcode = packet->opcode;
1554 u8 pad = packet->pad;
1555 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
1556
1557 spin_lock_irqsave(&qp->s_lock, flags);
1558 trace_hfi1_ack(qp, psn);
1559
1560 /* Ignore invalid responses. */
1561 if (cmp_psn(psn, READ_ONCE(qp->s_next_psn)) >= 0)
1562 goto ack_done;
1563
1564 /* Ignore duplicate responses. */
1565 diff = cmp_psn(psn, qp->s_last_psn);
1566 if (unlikely(diff <= 0)) {
1567 /* Update credits for "ghost" ACKs */
1568 if (diff == 0 && opcode == OP(ACKNOWLEDGE)) {
1569 aeth = be32_to_cpu(ohdr->u.aeth);
1570 if ((aeth >> IB_AETH_NAK_SHIFT) == 0)
1571 rvt_get_credit(qp, aeth);
1572 }
1573 goto ack_done;
1574 }
1575
1576 /*
1577 * Skip everything other than the PSN we expect, if we are waiting
1578 * for a reply to a restarted RDMA read or atomic op.
1579 */
1580 if (qp->r_flags & RVT_R_RDMAR_SEQ) {
1581 if (cmp_psn(psn, qp->s_last_psn + 1) != 0)
1582 goto ack_done;
1583 qp->r_flags &= ~RVT_R_RDMAR_SEQ;
1584 }
1585
1586 if (unlikely(qp->s_acked == qp->s_tail))
1587 goto ack_done;
1588 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1589 status = IB_WC_SUCCESS;
1590
1591 switch (opcode) {
1592 case OP(ACKNOWLEDGE):
1593 case OP(ATOMIC_ACKNOWLEDGE):
1594 case OP(RDMA_READ_RESPONSE_FIRST):
1595 aeth = be32_to_cpu(ohdr->u.aeth);
1596 if (opcode == OP(ATOMIC_ACKNOWLEDGE))
1597 val = ib_u64_get(&ohdr->u.at.atomic_ack_eth);
1598 else
1599 val = 0;
1600 if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) ||
1601 opcode != OP(RDMA_READ_RESPONSE_FIRST))
1602 goto ack_done;
1603 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1604 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1605 goto ack_op_err;
1606 /*
1607 * If this is a response to a resent RDMA read, we
1608 * have to be careful to copy the data to the right
1609 * location.
1610 */
1611 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
1612 wqe, psn, pmtu);
1613 goto read_middle;
1614
1615 case OP(RDMA_READ_RESPONSE_MIDDLE):
1616 /* no AETH, no ACK */
1617 if (unlikely(cmp_psn(psn, qp->s_last_psn + 1)))
1618 goto ack_seq_err;
1619 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1620 goto ack_op_err;
1621 read_middle:
1622 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
1623 goto ack_len_err;
1624 if (unlikely(pmtu >= qp->s_rdma_read_len))
1625 goto ack_len_err;
1626
1627 /*
1628 * We got a response so update the timeout.
1629 * 4.096 usec. * (1 << qp->timeout)
1630 */
1631 rvt_mod_retry_timer(qp);
1632 if (qp->s_flags & RVT_S_WAIT_ACK) {
1633 qp->s_flags &= ~RVT_S_WAIT_ACK;
1634 hfi1_schedule_send(qp);
1635 }
1636
1637 if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE))
1638 qp->s_retry = qp->s_retry_cnt;
1639
1640 /*
1641 * Update the RDMA receive state but do the copy w/o
1642 * holding the locks and blocking interrupts.
1643 */
1644 qp->s_rdma_read_len -= pmtu;
1645 update_last_psn(qp, psn);
1646 spin_unlock_irqrestore(&qp->s_lock, flags);
1647 hfi1_copy_sge(&qp->s_rdma_read_sge, data, pmtu, false, false);
1648 goto bail;
1649
1650 case OP(RDMA_READ_RESPONSE_ONLY):
1651 aeth = be32_to_cpu(ohdr->u.aeth);
1652 if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd))
1653 goto ack_done;
1654 /*
1655 * Check that the data size is >= 0 && <= pmtu.
1656 * Remember to account for ICRC (4).
1657 */
1658 if (unlikely(tlen < (hdrsize + extra_bytes)))
1659 goto ack_len_err;
1660 /*
1661 * If this is a response to a resent RDMA read, we
1662 * have to be careful to copy the data to the right
1663 * location.
1664 */
1665 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1666 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
1667 wqe, psn, pmtu);
1668 goto read_last;
1669
1670 case OP(RDMA_READ_RESPONSE_LAST):
1671 /* ACKs READ req. */
1672 if (unlikely(cmp_psn(psn, qp->s_last_psn + 1)))
1673 goto ack_seq_err;
1674 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
1675 goto ack_op_err;
1676 /*
1677 * Check that the data size is >= 1 && <= pmtu.
1678 * Remember to account for ICRC (4).
1679 */
1680 if (unlikely(tlen <= (hdrsize + extra_bytes)))
1681 goto ack_len_err;
1682 read_last:
1683 tlen -= hdrsize + extra_bytes;
1684 if (unlikely(tlen != qp->s_rdma_read_len))
1685 goto ack_len_err;
1686 aeth = be32_to_cpu(ohdr->u.aeth);
1687 hfi1_copy_sge(&qp->s_rdma_read_sge, data, tlen, false, false);
1688 WARN_ON(qp->s_rdma_read_sge.num_sge);
1689 (void)do_rc_ack(qp, aeth, psn,
1690 OP(RDMA_READ_RESPONSE_LAST), 0, rcd);
1691 goto ack_done;
1692 }
1693
1694 ack_op_err:
1695 status = IB_WC_LOC_QP_OP_ERR;
1696 goto ack_err;
1697
1698 ack_seq_err:
1699 ibp = rcd_to_iport(rcd);
1700 rdma_seq_err(qp, ibp, psn, rcd);
1701 goto ack_done;
1702
1703 ack_len_err:
1704 status = IB_WC_LOC_LEN_ERR;
1705 ack_err:
1706 if (qp->s_last == qp->s_acked) {
1707 hfi1_send_complete(qp, wqe, status);
1708 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1709 }
1710 ack_done:
1711 spin_unlock_irqrestore(&qp->s_lock, flags);
1712 bail:
1713 return;
1714 }
1715
1716 static inline void rc_defered_ack(struct hfi1_ctxtdata *rcd,
1717 struct rvt_qp *qp)
1718 {
1719 if (list_empty(&qp->rspwait)) {
1720 qp->r_flags |= RVT_R_RSP_NAK;
1721 rvt_get_qp(qp);
1722 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
1723 }
1724 }
1725
1726 static inline void rc_cancel_ack(struct rvt_qp *qp)
1727 {
1728 qp->r_adefered = 0;
1729 if (list_empty(&qp->rspwait))
1730 return;
1731 list_del_init(&qp->rspwait);
1732 qp->r_flags &= ~RVT_R_RSP_NAK;
1733 rvt_put_qp(qp);
1734 }
1735
1736 /**
1737 * rc_rcv_error - process an incoming duplicate or error RC packet
1738 * @ohdr: the other headers for this packet
1739 * @data: the packet data
1740 * @qp: the QP for this packet
1741 * @opcode: the opcode for this packet
1742 * @psn: the packet sequence number for this packet
1743 * @diff: the difference between the PSN and the expected PSN
1744 *
1745 * This is called from hfi1_rc_rcv() to process an unexpected
1746 * incoming RC packet for the given QP.
1747 * Called at interrupt level.
1748 * Return 1 if no more processing is needed; otherwise return 0 to
1749 * schedule a response to be sent.
1750 */
1751 static noinline int rc_rcv_error(struct ib_other_headers *ohdr, void *data,
1752 struct rvt_qp *qp, u32 opcode, u32 psn,
1753 int diff, struct hfi1_ctxtdata *rcd)
1754 {
1755 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
1756 struct rvt_ack_entry *e;
1757 unsigned long flags;
1758 u8 i, prev;
1759 int old_req;
1760
1761 trace_hfi1_rcv_error(qp, psn);
1762 if (diff > 0) {
1763 /*
1764 * Packet sequence error.
1765 * A NAK will ACK earlier sends and RDMA writes.
1766 * Don't queue the NAK if we already sent one.
1767 */
1768 if (!qp->r_nak_state) {
1769 ibp->rvp.n_rc_seqnak++;
1770 qp->r_nak_state = IB_NAK_PSN_ERROR;
1771 /* Use the expected PSN. */
1772 qp->r_ack_psn = qp->r_psn;
1773 /*
1774 * Wait to send the sequence NAK until all packets
1775 * in the receive queue have been processed.
1776 * Otherwise, we end up propagating congestion.
1777 */
1778 rc_defered_ack(rcd, qp);
1779 }
1780 goto done;
1781 }
1782
1783 /*
1784 * Handle a duplicate request. Don't re-execute SEND, RDMA
1785 * write or atomic op. Don't NAK errors, just silently drop
1786 * the duplicate request. Note that r_sge, r_len, and
1787 * r_rcv_len may be in use so don't modify them.
1788 *
1789 * We are supposed to ACK the earliest duplicate PSN but we
1790 * can coalesce an outstanding duplicate ACK. We have to
1791 * send the earliest so that RDMA reads can be restarted at
1792 * the requester's expected PSN.
1793 *
1794 * First, find where this duplicate PSN falls within the
1795 * ACKs previously sent.
1796 * old_req is true if there is an older response that is scheduled
1797 * to be sent before sending this one.
1798 */
1799 e = NULL;
1800 old_req = 1;
1801 ibp->rvp.n_rc_dupreq++;
1802
1803 spin_lock_irqsave(&qp->s_lock, flags);
1804
1805 for (i = qp->r_head_ack_queue; ; i = prev) {
1806 if (i == qp->s_tail_ack_queue)
1807 old_req = 0;
1808 if (i)
1809 prev = i - 1;
1810 else
1811 prev = HFI1_MAX_RDMA_ATOMIC;
1812 if (prev == qp->r_head_ack_queue) {
1813 e = NULL;
1814 break;
1815 }
1816 e = &qp->s_ack_queue[prev];
1817 if (!e->opcode) {
1818 e = NULL;
1819 break;
1820 }
1821 if (cmp_psn(psn, e->psn) >= 0) {
1822 if (prev == qp->s_tail_ack_queue &&
1823 cmp_psn(psn, e->lpsn) <= 0)
1824 old_req = 0;
1825 break;
1826 }
1827 }
1828 switch (opcode) {
1829 case OP(RDMA_READ_REQUEST): {
1830 struct ib_reth *reth;
1831 u32 offset;
1832 u32 len;
1833
1834 /*
1835 * If we didn't find the RDMA read request in the ack queue,
1836 * we can ignore this request.
1837 */
1838 if (!e || e->opcode != OP(RDMA_READ_REQUEST))
1839 goto unlock_done;
1840 /* RETH comes after BTH */
1841 reth = &ohdr->u.rc.reth;
1842 /*
1843 * Address range must be a subset of the original
1844 * request and start on pmtu boundaries.
1845 * We reuse the old ack_queue slot since the requester
1846 * should not back up and request an earlier PSN for the
1847 * same request.
1848 */
1849 offset = delta_psn(psn, e->psn) * qp->pmtu;
1850 len = be32_to_cpu(reth->length);
1851 if (unlikely(offset + len != e->rdma_sge.sge_length))
1852 goto unlock_done;
1853 if (e->rdma_sge.mr) {
1854 rvt_put_mr(e->rdma_sge.mr);
1855 e->rdma_sge.mr = NULL;
1856 }
1857 if (len != 0) {
1858 u32 rkey = be32_to_cpu(reth->rkey);
1859 u64 vaddr = get_ib_reth_vaddr(reth);
1860 int ok;
1861
1862 ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey,
1863 IB_ACCESS_REMOTE_READ);
1864 if (unlikely(!ok))
1865 goto unlock_done;
1866 } else {
1867 e->rdma_sge.vaddr = NULL;
1868 e->rdma_sge.length = 0;
1869 e->rdma_sge.sge_length = 0;
1870 }
1871 e->psn = psn;
1872 if (old_req)
1873 goto unlock_done;
1874 qp->s_tail_ack_queue = prev;
1875 break;
1876 }
1877
1878 case OP(COMPARE_SWAP):
1879 case OP(FETCH_ADD): {
1880 /*
1881 * If we didn't find the atomic request in the ack queue
1882 * or the send engine is already backed up to send an
1883 * earlier entry, we can ignore this request.
1884 */
1885 if (!e || e->opcode != (u8)opcode || old_req)
1886 goto unlock_done;
1887 qp->s_tail_ack_queue = prev;
1888 break;
1889 }
1890
1891 default:
1892 /*
1893 * Ignore this operation if it doesn't request an ACK
1894 * or an earlier RDMA read or atomic is going to be resent.
1895 */
1896 if (!(psn & IB_BTH_REQ_ACK) || old_req)
1897 goto unlock_done;
1898 /*
1899 * Resend the most recent ACK if this request is
1900 * after all the previous RDMA reads and atomics.
1901 */
1902 if (i == qp->r_head_ack_queue) {
1903 spin_unlock_irqrestore(&qp->s_lock, flags);
1904 qp->r_nak_state = 0;
1905 qp->r_ack_psn = qp->r_psn - 1;
1906 goto send_ack;
1907 }
1908
1909 /*
1910 * Resend the RDMA read or atomic op which
1911 * ACKs this duplicate request.
1912 */
1913 qp->s_tail_ack_queue = i;
1914 break;
1915 }
1916 qp->s_ack_state = OP(ACKNOWLEDGE);
1917 qp->s_flags |= RVT_S_RESP_PENDING;
1918 qp->r_nak_state = 0;
1919 hfi1_schedule_send(qp);
1920
1921 unlock_done:
1922 spin_unlock_irqrestore(&qp->s_lock, flags);
1923 done:
1924 return 1;
1925
1926 send_ack:
1927 return 0;
1928 }
1929
1930 static inline void update_ack_queue(struct rvt_qp *qp, unsigned n)
1931 {
1932 unsigned next;
1933
1934 next = n + 1;
1935 if (next > HFI1_MAX_RDMA_ATOMIC)
1936 next = 0;
1937 qp->s_tail_ack_queue = next;
1938 qp->s_ack_state = OP(ACKNOWLEDGE);
1939 }
1940
1941 static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid,
1942 u32 lqpn, u32 rqpn, u8 svc_type)
1943 {
1944 struct opa_hfi1_cong_log_event_internal *cc_event;
1945 unsigned long flags;
1946
1947 if (sl >= OPA_MAX_SLS)
1948 return;
1949
1950 spin_lock_irqsave(&ppd->cc_log_lock, flags);
1951
1952 ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8);
1953 ppd->threshold_event_counter++;
1954
1955 cc_event = &ppd->cc_events[ppd->cc_log_idx++];
1956 if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS)
1957 ppd->cc_log_idx = 0;
1958 cc_event->lqpn = lqpn & RVT_QPN_MASK;
1959 cc_event->rqpn = rqpn & RVT_QPN_MASK;
1960 cc_event->sl = sl;
1961 cc_event->svc_type = svc_type;
1962 cc_event->rlid = rlid;
1963 /* keep timestamp in units of 1.024 usec */
1964 cc_event->timestamp = ktime_get_ns() / 1024;
1965
1966 spin_unlock_irqrestore(&ppd->cc_log_lock, flags);
1967 }
1968
1969 void process_becn(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, u32 lqpn,
1970 u32 rqpn, u8 svc_type)
1971 {
1972 struct cca_timer *cca_timer;
1973 u16 ccti, ccti_incr, ccti_timer, ccti_limit;
1974 u8 trigger_threshold;
1975 struct cc_state *cc_state;
1976 unsigned long flags;
1977
1978 if (sl >= OPA_MAX_SLS)
1979 return;
1980
1981 cc_state = get_cc_state(ppd);
1982
1983 if (!cc_state)
1984 return;
1985
1986 /*
1987 * 1) increase CCTI (for this SL)
1988 * 2) select IPG (i.e., call set_link_ipg())
1989 * 3) start timer
1990 */
1991 ccti_limit = cc_state->cct.ccti_limit;
1992 ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase;
1993 ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer;
1994 trigger_threshold =
1995 cc_state->cong_setting.entries[sl].trigger_threshold;
1996
1997 spin_lock_irqsave(&ppd->cca_timer_lock, flags);
1998
1999 cca_timer = &ppd->cca_timer[sl];
2000 if (cca_timer->ccti < ccti_limit) {
2001 if (cca_timer->ccti + ccti_incr <= ccti_limit)
2002 cca_timer->ccti += ccti_incr;
2003 else
2004 cca_timer->ccti = ccti_limit;
2005 set_link_ipg(ppd);
2006 }
2007
2008 ccti = cca_timer->ccti;
2009
2010 if (!hrtimer_active(&cca_timer->hrtimer)) {
2011 /* ccti_timer is in units of 1.024 usec */
2012 unsigned long nsec = 1024 * ccti_timer;
2013
2014 hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec),
2015 HRTIMER_MODE_REL);
2016 }
2017
2018 spin_unlock_irqrestore(&ppd->cca_timer_lock, flags);
2019
2020 if ((trigger_threshold != 0) && (ccti >= trigger_threshold))
2021 log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type);
2022 }
2023
2024 /**
2025 * hfi1_rc_rcv - process an incoming RC packet
2026 * @packet: data packet information
2027 *
2028 * This is called from qp_rcv() to process an incoming RC packet
2029 * for the given QP.
2030 * May be called at interrupt level.
2031 */
2032 void hfi1_rc_rcv(struct hfi1_packet *packet)
2033 {
2034 struct hfi1_ctxtdata *rcd = packet->rcd;
2035 void *data = packet->payload;
2036 u32 tlen = packet->tlen;
2037 struct rvt_qp *qp = packet->qp;
2038 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
2039 struct ib_other_headers *ohdr = packet->ohdr;
2040 u32 opcode = packet->opcode;
2041 u32 hdrsize = packet->hlen;
2042 u32 psn = ib_bth_get_psn(packet->ohdr);
2043 u32 pad = packet->pad;
2044 struct ib_wc wc;
2045 u32 pmtu = qp->pmtu;
2046 int diff;
2047 struct ib_reth *reth;
2048 unsigned long flags;
2049 int ret;
2050 bool is_fecn = false;
2051 bool copy_last = false;
2052 u32 rkey;
2053 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
2054
2055 lockdep_assert_held(&qp->r_lock);
2056
2057 if (hfi1_ruc_check_hdr(ibp, packet))
2058 return;
2059
2060 is_fecn = process_ecn(qp, packet, false);
2061
2062 /*
2063 * Process responses (ACKs) before anything else. Note that the
2064 * packet sequence number will be for something in the send work
2065 * queue rather than the expected receive packet sequence number.
2066 * In other words, this QP is the requester.
2067 */
2068 if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
2069 opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
2070 rc_rcv_resp(packet);
2071 if (is_fecn)
2072 goto send_ack;
2073 return;
2074 }
2075
2076 /* Compute 24 bits worth of difference. */
2077 diff = delta_psn(psn, qp->r_psn);
2078 if (unlikely(diff)) {
2079 if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd))
2080 return;
2081 goto send_ack;
2082 }
2083
2084 /* Check for opcode sequence errors. */
2085 switch (qp->r_state) {
2086 case OP(SEND_FIRST):
2087 case OP(SEND_MIDDLE):
2088 if (opcode == OP(SEND_MIDDLE) ||
2089 opcode == OP(SEND_LAST) ||
2090 opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
2091 opcode == OP(SEND_LAST_WITH_INVALIDATE))
2092 break;
2093 goto nack_inv;
2094
2095 case OP(RDMA_WRITE_FIRST):
2096 case OP(RDMA_WRITE_MIDDLE):
2097 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
2098 opcode == OP(RDMA_WRITE_LAST) ||
2099 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
2100 break;
2101 goto nack_inv;
2102
2103 default:
2104 if (opcode == OP(SEND_MIDDLE) ||
2105 opcode == OP(SEND_LAST) ||
2106 opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
2107 opcode == OP(SEND_LAST_WITH_INVALIDATE) ||
2108 opcode == OP(RDMA_WRITE_MIDDLE) ||
2109 opcode == OP(RDMA_WRITE_LAST) ||
2110 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
2111 goto nack_inv;
2112 /*
2113 * Note that it is up to the requester to not send a new
2114 * RDMA read or atomic operation before receiving an ACK
2115 * for the previous operation.
2116 */
2117 break;
2118 }
2119
2120 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
2121 rvt_comm_est(qp);
2122
2123 /* OK, process the packet. */
2124 switch (opcode) {
2125 case OP(SEND_FIRST):
2126 ret = hfi1_rvt_get_rwqe(qp, 0);
2127 if (ret < 0)
2128 goto nack_op_err;
2129 if (!ret)
2130 goto rnr_nak;
2131 qp->r_rcv_len = 0;
2132 /* FALLTHROUGH */
2133 case OP(SEND_MIDDLE):
2134 case OP(RDMA_WRITE_MIDDLE):
2135 send_middle:
2136 /* Check for invalid length PMTU or posted rwqe len. */
2137 /*
2138 * There will be no padding for 9B packet but 16B packets
2139 * will come in with some padding since we always add
2140 * CRC and LT bytes which will need to be flit aligned
2141 */
2142 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
2143 goto nack_inv;
2144 qp->r_rcv_len += pmtu;
2145 if (unlikely(qp->r_rcv_len > qp->r_len))
2146 goto nack_inv;
2147 hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false);
2148 break;
2149
2150 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
2151 /* consume RWQE */
2152 ret = hfi1_rvt_get_rwqe(qp, 1);
2153 if (ret < 0)
2154 goto nack_op_err;
2155 if (!ret)
2156 goto rnr_nak;
2157 goto send_last_imm;
2158
2159 case OP(SEND_ONLY):
2160 case OP(SEND_ONLY_WITH_IMMEDIATE):
2161 case OP(SEND_ONLY_WITH_INVALIDATE):
2162 ret = hfi1_rvt_get_rwqe(qp, 0);
2163 if (ret < 0)
2164 goto nack_op_err;
2165 if (!ret)
2166 goto rnr_nak;
2167 qp->r_rcv_len = 0;
2168 if (opcode == OP(SEND_ONLY))
2169 goto no_immediate_data;
2170 if (opcode == OP(SEND_ONLY_WITH_INVALIDATE))
2171 goto send_last_inv;
2172 /* FALLTHROUGH -- for SEND_ONLY_WITH_IMMEDIATE */
2173 case OP(SEND_LAST_WITH_IMMEDIATE):
2174 send_last_imm:
2175 wc.ex.imm_data = ohdr->u.imm_data;
2176 wc.wc_flags = IB_WC_WITH_IMM;
2177 goto send_last;
2178 case OP(SEND_LAST_WITH_INVALIDATE):
2179 send_last_inv:
2180 rkey = be32_to_cpu(ohdr->u.ieth);
2181 if (rvt_invalidate_rkey(qp, rkey))
2182 goto no_immediate_data;
2183 wc.ex.invalidate_rkey = rkey;
2184 wc.wc_flags = IB_WC_WITH_INVALIDATE;
2185 goto send_last;
2186 case OP(RDMA_WRITE_LAST):
2187 copy_last = rvt_is_user_qp(qp);
2188 /* fall through */
2189 case OP(SEND_LAST):
2190 no_immediate_data:
2191 wc.wc_flags = 0;
2192 wc.ex.imm_data = 0;
2193 send_last:
2194 /* Check for invalid length. */
2195 /* LAST len should be >= 1 */
2196 if (unlikely(tlen < (hdrsize + extra_bytes)))
2197 goto nack_inv;
2198 /* Don't count the CRC(and padding and LT byte for 16B). */
2199 tlen -= (hdrsize + extra_bytes);
2200 wc.byte_len = tlen + qp->r_rcv_len;
2201 if (unlikely(wc.byte_len > qp->r_len))
2202 goto nack_inv;
2203 hfi1_copy_sge(&qp->r_sge, data, tlen, true, copy_last);
2204 rvt_put_ss(&qp->r_sge);
2205 qp->r_msn++;
2206 if (!__test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
2207 break;
2208 wc.wr_id = qp->r_wr_id;
2209 wc.status = IB_WC_SUCCESS;
2210 if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) ||
2211 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
2212 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
2213 else
2214 wc.opcode = IB_WC_RECV;
2215 wc.qp = &qp->ibqp;
2216 wc.src_qp = qp->remote_qpn;
2217 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
2218 /*
2219 * It seems that IB mandates the presence of an SL in a
2220 * work completion only for the UD transport (see section
2221 * 11.4.2 of IBTA Vol. 1).
2222 *
2223 * However, the way the SL is chosen below is consistent
2224 * with the way that IB/qib works and is trying avoid
2225 * introducing incompatibilities.
2226 *
2227 * See also OPA Vol. 1, section 9.7.6, and table 9-17.
2228 */
2229 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
2230 /* zero fields that are N/A */
2231 wc.vendor_err = 0;
2232 wc.pkey_index = 0;
2233 wc.dlid_path_bits = 0;
2234 wc.port_num = 0;
2235 /* Signal completion event if the solicited bit is set. */
2236 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
2237 ib_bth_is_solicited(ohdr));
2238 break;
2239
2240 case OP(RDMA_WRITE_ONLY):
2241 copy_last = rvt_is_user_qp(qp);
2242 /* fall through */
2243 case OP(RDMA_WRITE_FIRST):
2244 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
2245 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
2246 goto nack_inv;
2247 /* consume RWQE */
2248 reth = &ohdr->u.rc.reth;
2249 qp->r_len = be32_to_cpu(reth->length);
2250 qp->r_rcv_len = 0;
2251 qp->r_sge.sg_list = NULL;
2252 if (qp->r_len != 0) {
2253 u32 rkey = be32_to_cpu(reth->rkey);
2254 u64 vaddr = get_ib_reth_vaddr(reth);
2255 int ok;
2256
2257 /* Check rkey & NAK */
2258 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr,
2259 rkey, IB_ACCESS_REMOTE_WRITE);
2260 if (unlikely(!ok))
2261 goto nack_acc;
2262 qp->r_sge.num_sge = 1;
2263 } else {
2264 qp->r_sge.num_sge = 0;
2265 qp->r_sge.sge.mr = NULL;
2266 qp->r_sge.sge.vaddr = NULL;
2267 qp->r_sge.sge.length = 0;
2268 qp->r_sge.sge.sge_length = 0;
2269 }
2270 if (opcode == OP(RDMA_WRITE_FIRST))
2271 goto send_middle;
2272 else if (opcode == OP(RDMA_WRITE_ONLY))
2273 goto no_immediate_data;
2274 ret = hfi1_rvt_get_rwqe(qp, 1);
2275 if (ret < 0)
2276 goto nack_op_err;
2277 if (!ret) {
2278 /* peer will send again */
2279 rvt_put_ss(&qp->r_sge);
2280 goto rnr_nak;
2281 }
2282 wc.ex.imm_data = ohdr->u.rc.imm_data;
2283 wc.wc_flags = IB_WC_WITH_IMM;
2284 goto send_last;
2285
2286 case OP(RDMA_READ_REQUEST): {
2287 struct rvt_ack_entry *e;
2288 u32 len;
2289 u8 next;
2290
2291 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
2292 goto nack_inv;
2293 next = qp->r_head_ack_queue + 1;
2294 /* s_ack_queue is size HFI1_MAX_RDMA_ATOMIC+1 so use > not >= */
2295 if (next > HFI1_MAX_RDMA_ATOMIC)
2296 next = 0;
2297 spin_lock_irqsave(&qp->s_lock, flags);
2298 if (unlikely(next == qp->s_tail_ack_queue)) {
2299 if (!qp->s_ack_queue[next].sent)
2300 goto nack_inv_unlck;
2301 update_ack_queue(qp, next);
2302 }
2303 e = &qp->s_ack_queue[qp->r_head_ack_queue];
2304 if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
2305 rvt_put_mr(e->rdma_sge.mr);
2306 e->rdma_sge.mr = NULL;
2307 }
2308 reth = &ohdr->u.rc.reth;
2309 len = be32_to_cpu(reth->length);
2310 if (len) {
2311 u32 rkey = be32_to_cpu(reth->rkey);
2312 u64 vaddr = get_ib_reth_vaddr(reth);
2313 int ok;
2314
2315 /* Check rkey & NAK */
2316 ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr,
2317 rkey, IB_ACCESS_REMOTE_READ);
2318 if (unlikely(!ok))
2319 goto nack_acc_unlck;
2320 /*
2321 * Update the next expected PSN. We add 1 later
2322 * below, so only add the remainder here.
2323 */
2324 qp->r_psn += rvt_div_mtu(qp, len - 1);
2325 } else {
2326 e->rdma_sge.mr = NULL;
2327 e->rdma_sge.vaddr = NULL;
2328 e->rdma_sge.length = 0;
2329 e->rdma_sge.sge_length = 0;
2330 }
2331 e->opcode = opcode;
2332 e->sent = 0;
2333 e->psn = psn;
2334 e->lpsn = qp->r_psn;
2335 /*
2336 * We need to increment the MSN here instead of when we
2337 * finish sending the result since a duplicate request would
2338 * increment it more than once.
2339 */
2340 qp->r_msn++;
2341 qp->r_psn++;
2342 qp->r_state = opcode;
2343 qp->r_nak_state = 0;
2344 qp->r_head_ack_queue = next;
2345
2346 /* Schedule the send engine. */
2347 qp->s_flags |= RVT_S_RESP_PENDING;
2348 hfi1_schedule_send(qp);
2349
2350 spin_unlock_irqrestore(&qp->s_lock, flags);
2351 if (is_fecn)
2352 goto send_ack;
2353 return;
2354 }
2355
2356 case OP(COMPARE_SWAP):
2357 case OP(FETCH_ADD): {
2358 struct ib_atomic_eth *ateth;
2359 struct rvt_ack_entry *e;
2360 u64 vaddr;
2361 atomic64_t *maddr;
2362 u64 sdata;
2363 u32 rkey;
2364 u8 next;
2365
2366 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
2367 goto nack_inv;
2368 next = qp->r_head_ack_queue + 1;
2369 if (next > HFI1_MAX_RDMA_ATOMIC)
2370 next = 0;
2371 spin_lock_irqsave(&qp->s_lock, flags);
2372 if (unlikely(next == qp->s_tail_ack_queue)) {
2373 if (!qp->s_ack_queue[next].sent)
2374 goto nack_inv_unlck;
2375 update_ack_queue(qp, next);
2376 }
2377 e = &qp->s_ack_queue[qp->r_head_ack_queue];
2378 if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) {
2379 rvt_put_mr(e->rdma_sge.mr);
2380 e->rdma_sge.mr = NULL;
2381 }
2382 ateth = &ohdr->u.atomic_eth;
2383 vaddr = get_ib_ateth_vaddr(ateth);
2384 if (unlikely(vaddr & (sizeof(u64) - 1)))
2385 goto nack_inv_unlck;
2386 rkey = be32_to_cpu(ateth->rkey);
2387 /* Check rkey & NAK */
2388 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
2389 vaddr, rkey,
2390 IB_ACCESS_REMOTE_ATOMIC)))
2391 goto nack_acc_unlck;
2392 /* Perform atomic OP and save result. */
2393 maddr = (atomic64_t *)qp->r_sge.sge.vaddr;
2394 sdata = get_ib_ateth_swap(ateth);
2395 e->atomic_data = (opcode == OP(FETCH_ADD)) ?
2396 (u64)atomic64_add_return(sdata, maddr) - sdata :
2397 (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr,
2398 get_ib_ateth_compare(ateth),
2399 sdata);
2400 rvt_put_mr(qp->r_sge.sge.mr);
2401 qp->r_sge.num_sge = 0;
2402 e->opcode = opcode;
2403 e->sent = 0;
2404 e->psn = psn;
2405 e->lpsn = psn;
2406 qp->r_msn++;
2407 qp->r_psn++;
2408 qp->r_state = opcode;
2409 qp->r_nak_state = 0;
2410 qp->r_head_ack_queue = next;
2411
2412 /* Schedule the send engine. */
2413 qp->s_flags |= RVT_S_RESP_PENDING;
2414 hfi1_schedule_send(qp);
2415
2416 spin_unlock_irqrestore(&qp->s_lock, flags);
2417 if (is_fecn)
2418 goto send_ack;
2419 return;
2420 }
2421
2422 default:
2423 /* NAK unknown opcodes. */
2424 goto nack_inv;
2425 }
2426 qp->r_psn++;
2427 qp->r_state = opcode;
2428 qp->r_ack_psn = psn;
2429 qp->r_nak_state = 0;
2430 /* Send an ACK if requested or required. */
2431 if (psn & IB_BTH_REQ_ACK) {
2432 if (packet->numpkt == 0) {
2433 rc_cancel_ack(qp);
2434 goto send_ack;
2435 }
2436 if (qp->r_adefered >= HFI1_PSN_CREDIT) {
2437 rc_cancel_ack(qp);
2438 goto send_ack;
2439 }
2440 if (unlikely(is_fecn)) {
2441 rc_cancel_ack(qp);
2442 goto send_ack;
2443 }
2444 qp->r_adefered++;
2445 rc_defered_ack(rcd, qp);
2446 }
2447 return;
2448
2449 rnr_nak:
2450 qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK;
2451 qp->r_ack_psn = qp->r_psn;
2452 /* Queue RNR NAK for later */
2453 rc_defered_ack(rcd, qp);
2454 return;
2455
2456 nack_op_err:
2457 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
2458 qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR;
2459 qp->r_ack_psn = qp->r_psn;
2460 /* Queue NAK for later */
2461 rc_defered_ack(rcd, qp);
2462 return;
2463
2464 nack_inv_unlck:
2465 spin_unlock_irqrestore(&qp->s_lock, flags);
2466 nack_inv:
2467 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
2468 qp->r_nak_state = IB_NAK_INVALID_REQUEST;
2469 qp->r_ack_psn = qp->r_psn;
2470 /* Queue NAK for later */
2471 rc_defered_ack(rcd, qp);
2472 return;
2473
2474 nack_acc_unlck:
2475 spin_unlock_irqrestore(&qp->s_lock, flags);
2476 nack_acc:
2477 rvt_rc_error(qp, IB_WC_LOC_PROT_ERR);
2478 qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
2479 qp->r_ack_psn = qp->r_psn;
2480 send_ack:
2481 hfi1_send_rc_ack(packet, is_fecn);
2482 }
2483
2484 void hfi1_rc_hdrerr(
2485 struct hfi1_ctxtdata *rcd,
2486 struct hfi1_packet *packet,
2487 struct rvt_qp *qp)
2488 {
2489 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
2490 int diff;
2491 u32 opcode;
2492 u32 psn;
2493
2494 if (hfi1_ruc_check_hdr(ibp, packet))
2495 return;
2496
2497 psn = ib_bth_get_psn(packet->ohdr);
2498 opcode = ib_bth_get_opcode(packet->ohdr);
2499
2500 /* Only deal with RDMA Writes for now */
2501 if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) {
2502 diff = delta_psn(psn, qp->r_psn);
2503 if (!qp->r_nak_state && diff >= 0) {
2504 ibp->rvp.n_rc_seqnak++;
2505 qp->r_nak_state = IB_NAK_PSN_ERROR;
2506 /* Use the expected PSN. */
2507 qp->r_ack_psn = qp->r_psn;
2508 /*
2509 * Wait to send the sequence
2510 * NAK until all packets
2511 * in the receive queue have
2512 * been processed.
2513 * Otherwise, we end up
2514 * propagating congestion.
2515 */
2516 rc_defered_ack(rcd, qp);
2517 } /* Out of sequence NAK */
2518 } /* QP Request NAKs */
2519 }
CRIS linux kernel tree