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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2015 - 2018 Intel Corporation.
4 */
5
6#include <linux/io.h>
7#include <rdma/rdma_vt.h>
8#include <rdma/rdmavt_qp.h>
9
10#include "hfi.h"
11#include "qp.h"
12#include "rc.h"
13#include "verbs_txreq.h"
14#include "trace.h"
15
16struct rvt_ack_entry *find_prev_entry(struct rvt_qp *qp, u32 psn, u8 *prev,
17 u8 *prev_ack, bool *scheduled)
18 __must_hold(&qp->s_lock)
19{
20 struct rvt_ack_entry *e = NULL;
21 u8 i, p;
22 bool s = true;
23
24 for (i = qp->r_head_ack_queue; ; i = p) {
25 if (i == qp->s_tail_ack_queue)
26 s = false;
27 if (i)
28 p = i - 1;
29 else
30 p = rvt_size_atomic(ib_to_rvt(qp->ibqp.device));
31 if (p == qp->r_head_ack_queue) {
32 e = NULL;
33 break;
34 }
35 e = &qp->s_ack_queue[p];
36 if (!e->opcode) {
37 e = NULL;
38 break;
39 }
40 if (cmp_psn(psn, e->psn) >= 0) {
41 if (p == qp->s_tail_ack_queue &&
42 cmp_psn(psn, e->lpsn) <= 0)
43 s = false;
44 break;
45 }
46 }
47 if (prev)
48 *prev = p;
49 if (prev_ack)
50 *prev_ack = i;
51 if (scheduled)
52 *scheduled = s;
53 return e;
54}
55
56/**
57 * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
58 * @dev: the device for this QP
59 * @qp: a pointer to the QP
60 * @ohdr: a pointer to the IB header being constructed
61 * @ps: the xmit packet state
62 *
63 * Return 1 if constructed; otherwise, return 0.
64 * Note that we are in the responder's side of the QP context.
65 * Note the QP s_lock must be held.
66 */
67static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp,
68 struct ib_other_headers *ohdr,
69 struct hfi1_pkt_state *ps)
70{
71 struct rvt_ack_entry *e;
72 u32 hwords, hdrlen;
73 u32 len = 0;
74 u32 bth0 = 0, bth2 = 0;
75 u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT);
76 int middle = 0;
77 u32 pmtu = qp->pmtu;
78 struct hfi1_qp_priv *qpriv = qp->priv;
79 bool last_pkt;
80 u32 delta;
81 u8 next = qp->s_tail_ack_queue;
82 struct tid_rdma_request *req;
83
84 trace_hfi1_rsp_make_rc_ack(qp, 0);
85 lockdep_assert_held(&qp->s_lock);
86 /* Don't send an ACK if we aren't supposed to. */
87 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
88 goto bail;
89
90 if (qpriv->hdr_type == HFI1_PKT_TYPE_9B)
91 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
92 hwords = 5;
93 else
94 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
95 hwords = 7;
96
97 switch (qp->s_ack_state) {
98 case OP(RDMA_READ_RESPONSE_LAST):
99 case OP(RDMA_READ_RESPONSE_ONLY):
100 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
101 release_rdma_sge_mr(e);
102 fallthrough;
103 case OP(ATOMIC_ACKNOWLEDGE):
104 /*
105 * We can increment the tail pointer now that the last
106 * response has been sent instead of only being
107 * constructed.
108 */
109 if (++next > rvt_size_atomic(&dev->rdi))
110 next = 0;
111 /*
112 * Only advance the s_acked_ack_queue pointer if there
113 * have been no TID RDMA requests.
114 */
115 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
116 if (e->opcode != TID_OP(WRITE_REQ) &&
117 qp->s_acked_ack_queue == qp->s_tail_ack_queue)
118 qp->s_acked_ack_queue = next;
119 qp->s_tail_ack_queue = next;
120 trace_hfi1_rsp_make_rc_ack(qp, e->psn);
121 fallthrough;
122 case OP(SEND_ONLY):
123 case OP(ACKNOWLEDGE):
124 /* Check for no next entry in the queue. */
125 if (qp->r_head_ack_queue == qp->s_tail_ack_queue) {
126 if (qp->s_flags & RVT_S_ACK_PENDING)
127 goto normal;
128 goto bail;
129 }
130
131 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
132 /* Check for tid write fence */
133 if ((qpriv->s_flags & HFI1_R_TID_WAIT_INTERLCK) ||
134 hfi1_tid_rdma_ack_interlock(qp, e)) {
135 iowait_set_flag(&qpriv->s_iowait, IOWAIT_PENDING_IB);
136 goto bail;
137 }
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 if (qp->s_acked_ack_queue ==
148 qp->s_tail_ack_queue)
149 qp->s_acked_ack_queue =
150 qp->r_head_ack_queue;
151 qp->s_tail_ack_queue = qp->r_head_ack_queue;
152 goto bail;
153 }
154 /* Copy SGE state in case we need to resend */
155 ps->s_txreq->mr = e->rdma_sge.mr;
156 if (ps->s_txreq->mr)
157 rvt_get_mr(ps->s_txreq->mr);
158 qp->s_ack_rdma_sge.sge = e->rdma_sge;
159 qp->s_ack_rdma_sge.num_sge = 1;
160 ps->s_txreq->ss = &qp->s_ack_rdma_sge;
161 if (len > pmtu) {
162 len = pmtu;
163 qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
164 } else {
165 qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
166 e->sent = 1;
167 }
168 ohdr->u.aeth = rvt_compute_aeth(qp);
169 hwords++;
170 qp->s_ack_rdma_psn = e->psn;
171 bth2 = mask_psn(qp->s_ack_rdma_psn++);
172 } else if (e->opcode == TID_OP(WRITE_REQ)) {
173 /*
174 * If a TID RDMA WRITE RESP is being resent, we have to
175 * wait for the actual request. All requests that are to
176 * be resent will have their state set to
177 * TID_REQUEST_RESEND. When the new request arrives, the
178 * state will be changed to TID_REQUEST_RESEND_ACTIVE.
179 */
180 req = ack_to_tid_req(e);
181 if (req->state == TID_REQUEST_RESEND ||
182 req->state == TID_REQUEST_INIT_RESEND)
183 goto bail;
184 qp->s_ack_state = TID_OP(WRITE_RESP);
185 qp->s_ack_rdma_psn = mask_psn(e->psn + req->cur_seg);
186 goto write_resp;
187 } else if (e->opcode == TID_OP(READ_REQ)) {
188 /*
189 * If a TID RDMA read response is being resent and
190 * we haven't seen the duplicate request yet,
191 * then stop sending the remaining responses the
192 * responder has seen until the requester re-sends it.
193 */
194 len = e->rdma_sge.sge_length;
195 if (len && !e->rdma_sge.mr) {
196 if (qp->s_acked_ack_queue ==
197 qp->s_tail_ack_queue)
198 qp->s_acked_ack_queue =
199 qp->r_head_ack_queue;
200 qp->s_tail_ack_queue = qp->r_head_ack_queue;
201 goto bail;
202 }
203 /* Copy SGE state in case we need to resend */
204 ps->s_txreq->mr = e->rdma_sge.mr;
205 if (ps->s_txreq->mr)
206 rvt_get_mr(ps->s_txreq->mr);
207 qp->s_ack_rdma_sge.sge = e->rdma_sge;
208 qp->s_ack_rdma_sge.num_sge = 1;
209 qp->s_ack_state = TID_OP(READ_RESP);
210 goto read_resp;
211 } else {
212 /* COMPARE_SWAP or FETCH_ADD */
213 ps->s_txreq->ss = NULL;
214 len = 0;
215 qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
216 ohdr->u.at.aeth = rvt_compute_aeth(qp);
217 ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth);
218 hwords += sizeof(ohdr->u.at) / sizeof(u32);
219 bth2 = mask_psn(e->psn);
220 e->sent = 1;
221 }
222 trace_hfi1_tid_write_rsp_make_rc_ack(qp);
223 bth0 = qp->s_ack_state << 24;
224 break;
225
226 case OP(RDMA_READ_RESPONSE_FIRST):
227 qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
228 fallthrough;
229 case OP(RDMA_READ_RESPONSE_MIDDLE):
230 ps->s_txreq->ss = &qp->s_ack_rdma_sge;
231 ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr;
232 if (ps->s_txreq->mr)
233 rvt_get_mr(ps->s_txreq->mr);
234 len = qp->s_ack_rdma_sge.sge.sge_length;
235 if (len > pmtu) {
236 len = pmtu;
237 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
238 } else {
239 ohdr->u.aeth = rvt_compute_aeth(qp);
240 hwords++;
241 qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
242 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
243 e->sent = 1;
244 }
245 bth0 = qp->s_ack_state << 24;
246 bth2 = mask_psn(qp->s_ack_rdma_psn++);
247 break;
248
249 case TID_OP(WRITE_RESP):
250write_resp:
251 /*
252 * 1. Check if RVT_S_ACK_PENDING is set. If yes,
253 * goto normal.
254 * 2. Attempt to allocate TID resources.
255 * 3. Remove RVT_S_RESP_PENDING flags from s_flags
256 * 4. If resources not available:
257 * 4.1 Set RVT_S_WAIT_TID_SPACE
258 * 4.2 Queue QP on RCD TID queue
259 * 4.3 Put QP on iowait list.
260 * 4.4 Build IB RNR NAK with appropriate timeout value
261 * 4.5 Return indication progress made.
262 * 5. If resources are available:
263 * 5.1 Program HW flow CSRs
264 * 5.2 Build TID RDMA WRITE RESP packet
265 * 5.3 If more resources needed, do 2.1 - 2.3.
266 * 5.4 Wake up next QP on RCD TID queue.
267 * 5.5 Return indication progress made.
268 */
269
270 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
271 req = ack_to_tid_req(e);
272
273 /*
274 * Send scheduled RNR NAK's. RNR NAK's need to be sent at
275 * segment boundaries, not at request boundaries. Don't change
276 * s_ack_state because we are still in the middle of a request
277 */
278 if (qpriv->rnr_nak_state == TID_RNR_NAK_SEND &&
279 qp->s_tail_ack_queue == qpriv->r_tid_alloc &&
280 req->cur_seg == req->alloc_seg) {
281 qpriv->rnr_nak_state = TID_RNR_NAK_SENT;
282 goto normal_no_state;
283 }
284
285 bth2 = mask_psn(qp->s_ack_rdma_psn);
286 hdrlen = hfi1_build_tid_rdma_write_resp(qp, e, ohdr, &bth1,
287 bth2, &len,
288 &ps->s_txreq->ss);
289 if (!hdrlen)
290 return 0;
291
292 hwords += hdrlen;
293 bth0 = qp->s_ack_state << 24;
294 qp->s_ack_rdma_psn++;
295 trace_hfi1_tid_req_make_rc_ack_write(qp, 0, e->opcode, e->psn,
296 e->lpsn, req);
297 if (req->cur_seg != req->total_segs)
298 break;
299
300 e->sent = 1;
301 /* Do not free e->rdma_sge until all data are received */
302 qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
303 break;
304
305 case TID_OP(READ_RESP):
306read_resp:
307 e = &qp->s_ack_queue[qp->s_tail_ack_queue];
308 ps->s_txreq->ss = &qp->s_ack_rdma_sge;
309 delta = hfi1_build_tid_rdma_read_resp(qp, e, ohdr, &bth0,
310 &bth1, &bth2, &len,
311 &last_pkt);
312 if (delta == 0)
313 goto error_qp;
314 hwords += delta;
315 if (last_pkt) {
316 e->sent = 1;
317 /*
318 * Increment qp->s_tail_ack_queue through s_ack_state
319 * transition.
320 */
321 qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
322 }
323 break;
324 case TID_OP(READ_REQ):
325 goto bail;
326
327 default:
328normal:
329 /*
330 * Send a regular ACK.
331 * Set the s_ack_state so we wait until after sending
332 * the ACK before setting s_ack_state to ACKNOWLEDGE
333 * (see above).
334 */
335 qp->s_ack_state = OP(SEND_ONLY);
336normal_no_state:
337 if (qp->s_nak_state)
338 ohdr->u.aeth =
339 cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
340 (qp->s_nak_state <<
341 IB_AETH_CREDIT_SHIFT));
342 else
343 ohdr->u.aeth = rvt_compute_aeth(qp);
344 hwords++;
345 len = 0;
346 bth0 = OP(ACKNOWLEDGE) << 24;
347 bth2 = mask_psn(qp->s_ack_psn);
348 qp->s_flags &= ~RVT_S_ACK_PENDING;
349 ps->s_txreq->txreq.flags |= SDMA_TXREQ_F_VIP;
350 ps->s_txreq->ss = NULL;
351 }
352 qp->s_rdma_ack_cnt++;
353 ps->s_txreq->sde = qpriv->s_sde;
354 ps->s_txreq->s_cur_size = len;
355 ps->s_txreq->hdr_dwords = hwords;
356 hfi1_make_ruc_header(qp, ohdr, bth0, bth1, bth2, middle, ps);
357 return 1;
358error_qp:
359 spin_unlock_irqrestore(&qp->s_lock, ps->flags);
360 spin_lock_irqsave(&qp->r_lock, ps->flags);
361 spin_lock(&qp->s_lock);
362 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
363 spin_unlock(&qp->s_lock);
364 spin_unlock_irqrestore(&qp->r_lock, ps->flags);
365 spin_lock_irqsave(&qp->s_lock, ps->flags);
366bail:
367 qp->s_ack_state = OP(ACKNOWLEDGE);
368 /*
369 * Ensure s_rdma_ack_cnt changes are committed prior to resetting
370 * RVT_S_RESP_PENDING
371 */
372 smp_wmb();
373 qp->s_flags &= ~(RVT_S_RESP_PENDING
374 | RVT_S_ACK_PENDING
375 | HFI1_S_AHG_VALID);
376 return 0;
377}
378
379/**
380 * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
381 * @qp: a pointer to the QP
382 * @ps: the current packet state
383 *
384 * Assumes s_lock is held.
385 *
386 * Return 1 if constructed; otherwise, return 0.
387 */
388int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
389{
390 struct hfi1_qp_priv *priv = qp->priv;
391 struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
392 struct ib_other_headers *ohdr;
393 struct rvt_sge_state *ss = NULL;
394 struct rvt_swqe *wqe;
395 struct hfi1_swqe_priv *wpriv;
396 struct tid_rdma_request *req = NULL;
397 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
398 u32 hwords = 5;
399 u32 len = 0;
400 u32 bth0 = 0, bth2 = 0;
401 u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT);
402 u32 pmtu = qp->pmtu;
403 char newreq;
404 int middle = 0;
405 int delta;
406 struct tid_rdma_flow *flow = NULL;
407 struct tid_rdma_params *remote;
408
409 trace_hfi1_sender_make_rc_req(qp);
410 lockdep_assert_held(&qp->s_lock);
411 ps->s_txreq = get_txreq(ps->dev, qp);
412 if (!ps->s_txreq)
413 goto bail_no_tx;
414
415 if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
416 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
417 hwords = 5;
418 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
419 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
420 else
421 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
422 } else {
423 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
424 hwords = 7;
425 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
426 (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
427 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
428 else
429 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
430 }
431
432 /* Sending responses has higher priority over sending requests. */
433 if ((qp->s_flags & RVT_S_RESP_PENDING) &&
434 make_rc_ack(dev, qp, ohdr, ps))
435 return 1;
436
437 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
438 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
439 goto bail;
440 /* We are in the error state, flush the work request. */
441 if (qp->s_last == READ_ONCE(qp->s_head))
442 goto bail;
443 /* If DMAs are in progress, we can't flush immediately. */
444 if (iowait_sdma_pending(&priv->s_iowait)) {
445 qp->s_flags |= RVT_S_WAIT_DMA;
446 goto bail;
447 }
448 clear_ahg(qp);
449 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
450 hfi1_trdma_send_complete(qp, wqe, qp->s_last != qp->s_acked ?
451 IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR);
452 /* will get called again */
453 goto done_free_tx;
454 }
455
456 if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK | HFI1_S_WAIT_HALT))
457 goto bail;
458
459 if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) {
460 if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) {
461 qp->s_flags |= RVT_S_WAIT_PSN;
462 goto bail;
463 }
464 qp->s_sending_psn = qp->s_psn;
465 qp->s_sending_hpsn = qp->s_psn - 1;
466 }
467
468 /* Send a request. */
469 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
470check_s_state:
471 switch (qp->s_state) {
472 default:
473 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK))
474 goto bail;
475 /*
476 * Resend an old request or start a new one.
477 *
478 * We keep track of the current SWQE so that
479 * we don't reset the "furthest progress" state
480 * if we need to back up.
481 */
482 newreq = 0;
483 if (qp->s_cur == qp->s_tail) {
484 /* Check if send work queue is empty. */
485 if (qp->s_tail == READ_ONCE(qp->s_head)) {
486 clear_ahg(qp);
487 goto bail;
488 }
489 /*
490 * If a fence is requested, wait for previous
491 * RDMA read and atomic operations to finish.
492 * However, there is no need to guard against
493 * TID RDMA READ after TID RDMA READ.
494 */
495 if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
496 qp->s_num_rd_atomic &&
497 (wqe->wr.opcode != IB_WR_TID_RDMA_READ ||
498 priv->pending_tid_r_segs < qp->s_num_rd_atomic)) {
499 qp->s_flags |= RVT_S_WAIT_FENCE;
500 goto bail;
501 }
502 /*
503 * Local operations are processed immediately
504 * after all prior requests have completed
505 */
506 if (wqe->wr.opcode == IB_WR_REG_MR ||
507 wqe->wr.opcode == IB_WR_LOCAL_INV) {
508 int local_ops = 0;
509 int err = 0;
510
511 if (qp->s_last != qp->s_cur)
512 goto bail;
513 if (++qp->s_cur == qp->s_size)
514 qp->s_cur = 0;
515 if (++qp->s_tail == qp->s_size)
516 qp->s_tail = 0;
517 if (!(wqe->wr.send_flags &
518 RVT_SEND_COMPLETION_ONLY)) {
519 err = rvt_invalidate_rkey(
520 qp,
521 wqe->wr.ex.invalidate_rkey);
522 local_ops = 1;
523 }
524 rvt_send_complete(qp, wqe,
525 err ? IB_WC_LOC_PROT_ERR
526 : IB_WC_SUCCESS);
527 if (local_ops)
528 atomic_dec(&qp->local_ops_pending);
529 goto done_free_tx;
530 }
531
532 newreq = 1;
533 qp->s_psn = wqe->psn;
534 }
535 /*
536 * Note that we have to be careful not to modify the
537 * original work request since we may need to resend
538 * it.
539 */
540 len = wqe->length;
541 ss = &qp->s_sge;
542 bth2 = mask_psn(qp->s_psn);
543
544 /*
545 * Interlock between various IB requests and TID RDMA
546 * if necessary.
547 */
548 if ((priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) ||
549 hfi1_tid_rdma_wqe_interlock(qp, wqe))
550 goto bail;
551
552 switch (wqe->wr.opcode) {
553 case IB_WR_SEND:
554 case IB_WR_SEND_WITH_IMM:
555 case IB_WR_SEND_WITH_INV:
556 /* If no credit, return. */
557 if (!rvt_rc_credit_avail(qp, wqe))
558 goto bail;
559 if (len > pmtu) {
560 qp->s_state = OP(SEND_FIRST);
561 len = pmtu;
562 break;
563 }
564 if (wqe->wr.opcode == IB_WR_SEND) {
565 qp->s_state = OP(SEND_ONLY);
566 } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
567 qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE);
568 /* Immediate data comes after the BTH */
569 ohdr->u.imm_data = wqe->wr.ex.imm_data;
570 hwords += 1;
571 } else {
572 qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE);
573 /* Invalidate rkey comes after the BTH */
574 ohdr->u.ieth = cpu_to_be32(
575 wqe->wr.ex.invalidate_rkey);
576 hwords += 1;
577 }
578 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
579 bth0 |= IB_BTH_SOLICITED;
580 bth2 |= IB_BTH_REQ_ACK;
581 if (++qp->s_cur == qp->s_size)
582 qp->s_cur = 0;
583 break;
584
585 case IB_WR_RDMA_WRITE:
586 if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
587 qp->s_lsn++;
588 goto no_flow_control;
589 case IB_WR_RDMA_WRITE_WITH_IMM:
590 /* If no credit, return. */
591 if (!rvt_rc_credit_avail(qp, wqe))
592 goto bail;
593no_flow_control:
594 put_ib_reth_vaddr(
595 wqe->rdma_wr.remote_addr,
596 &ohdr->u.rc.reth);
597 ohdr->u.rc.reth.rkey =
598 cpu_to_be32(wqe->rdma_wr.rkey);
599 ohdr->u.rc.reth.length = cpu_to_be32(len);
600 hwords += sizeof(struct ib_reth) / sizeof(u32);
601 if (len > pmtu) {
602 qp->s_state = OP(RDMA_WRITE_FIRST);
603 len = pmtu;
604 break;
605 }
606 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
607 qp->s_state = OP(RDMA_WRITE_ONLY);
608 } else {
609 qp->s_state =
610 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
611 /* Immediate data comes after RETH */
612 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
613 hwords += 1;
614 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
615 bth0 |= IB_BTH_SOLICITED;
616 }
617 bth2 |= IB_BTH_REQ_ACK;
618 if (++qp->s_cur == qp->s_size)
619 qp->s_cur = 0;
620 break;
621
622 case IB_WR_TID_RDMA_WRITE:
623 if (newreq) {
624 /*
625 * Limit the number of TID RDMA WRITE requests.
626 */
627 if (atomic_read(&priv->n_tid_requests) >=
628 HFI1_TID_RDMA_WRITE_CNT)
629 goto bail;
630
631 if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
632 qp->s_lsn++;
633 }
634
635 hwords += hfi1_build_tid_rdma_write_req(qp, wqe, ohdr,
636 &bth1, &bth2,
637 &len);
638 ss = NULL;
639 if (priv->s_tid_cur == HFI1_QP_WQE_INVALID) {
640 priv->s_tid_cur = qp->s_cur;
641 if (priv->s_tid_tail == HFI1_QP_WQE_INVALID) {
642 priv->s_tid_tail = qp->s_cur;
643 priv->s_state = TID_OP(WRITE_RESP);
644 }
645 } else if (priv->s_tid_cur == priv->s_tid_head) {
646 struct rvt_swqe *__w;
647 struct tid_rdma_request *__r;
648
649 __w = rvt_get_swqe_ptr(qp, priv->s_tid_cur);
650 __r = wqe_to_tid_req(__w);
651
652 /*
653 * The s_tid_cur pointer is advanced to s_cur if
654 * any of the following conditions about the WQE
655 * to which s_ti_cur currently points to are
656 * satisfied:
657 * 1. The request is not a TID RDMA WRITE
658 * request,
659 * 2. The request is in the INACTIVE or
660 * COMPLETE states (TID RDMA READ requests
661 * stay at INACTIVE and TID RDMA WRITE
662 * transition to COMPLETE when done),
663 * 3. The request is in the ACTIVE or SYNC
664 * state and the number of completed
665 * segments is equal to the total segment
666 * count.
667 * (If ACTIVE, the request is waiting for
668 * ACKs. If SYNC, the request has not
669 * received any responses because it's
670 * waiting on a sync point.)
671 */
672 if (__w->wr.opcode != IB_WR_TID_RDMA_WRITE ||
673 __r->state == TID_REQUEST_INACTIVE ||
674 __r->state == TID_REQUEST_COMPLETE ||
675 ((__r->state == TID_REQUEST_ACTIVE ||
676 __r->state == TID_REQUEST_SYNC) &&
677 __r->comp_seg == __r->total_segs)) {
678 if (priv->s_tid_tail ==
679 priv->s_tid_cur &&
680 priv->s_state ==
681 TID_OP(WRITE_DATA_LAST)) {
682 priv->s_tid_tail = qp->s_cur;
683 priv->s_state =
684 TID_OP(WRITE_RESP);
685 }
686 priv->s_tid_cur = qp->s_cur;
687 }
688 /*
689 * A corner case: when the last TID RDMA WRITE
690 * request was completed, s_tid_head,
691 * s_tid_cur, and s_tid_tail all point to the
692 * same location. Other requests are posted and
693 * s_cur wraps around to the same location,
694 * where a new TID RDMA WRITE is posted. In
695 * this case, none of the indices need to be
696 * updated. However, the priv->s_state should.
697 */
698 if (priv->s_tid_tail == qp->s_cur &&
699 priv->s_state == TID_OP(WRITE_DATA_LAST))
700 priv->s_state = TID_OP(WRITE_RESP);
701 }
702 req = wqe_to_tid_req(wqe);
703 if (newreq) {
704 priv->s_tid_head = qp->s_cur;
705 priv->pending_tid_w_resp += req->total_segs;
706 atomic_inc(&priv->n_tid_requests);
707 atomic_dec(&priv->n_requests);
708 } else {
709 req->state = TID_REQUEST_RESEND;
710 req->comp_seg = delta_psn(bth2, wqe->psn);
711 /*
712 * Pull back any segments since we are going
713 * to re-receive them.
714 */
715 req->setup_head = req->clear_tail;
716 priv->pending_tid_w_resp +=
717 delta_psn(wqe->lpsn, bth2) + 1;
718 }
719
720 trace_hfi1_tid_write_sender_make_req(qp, newreq);
721 trace_hfi1_tid_req_make_req_write(qp, newreq,
722 wqe->wr.opcode,
723 wqe->psn, wqe->lpsn,
724 req);
725 if (++qp->s_cur == qp->s_size)
726 qp->s_cur = 0;
727 break;
728
729 case IB_WR_RDMA_READ:
730 /*
731 * Don't allow more operations to be started
732 * than the QP limits allow.
733 */
734 if (qp->s_num_rd_atomic >=
735 qp->s_max_rd_atomic) {
736 qp->s_flags |= RVT_S_WAIT_RDMAR;
737 goto bail;
738 }
739 qp->s_num_rd_atomic++;
740 if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
741 qp->s_lsn++;
742 put_ib_reth_vaddr(
743 wqe->rdma_wr.remote_addr,
744 &ohdr->u.rc.reth);
745 ohdr->u.rc.reth.rkey =
746 cpu_to_be32(wqe->rdma_wr.rkey);
747 ohdr->u.rc.reth.length = cpu_to_be32(len);
748 qp->s_state = OP(RDMA_READ_REQUEST);
749 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
750 ss = NULL;
751 len = 0;
752 bth2 |= IB_BTH_REQ_ACK;
753 if (++qp->s_cur == qp->s_size)
754 qp->s_cur = 0;
755 break;
756
757 case IB_WR_TID_RDMA_READ:
758 trace_hfi1_tid_read_sender_make_req(qp, newreq);
759 wpriv = wqe->priv;
760 req = wqe_to_tid_req(wqe);
761 trace_hfi1_tid_req_make_req_read(qp, newreq,
762 wqe->wr.opcode,
763 wqe->psn, wqe->lpsn,
764 req);
765 delta = cmp_psn(qp->s_psn, wqe->psn);
766
767 /*
768 * Don't allow more operations to be started
769 * than the QP limits allow. We could get here under
770 * three conditions; (1) It's a new request; (2) We are
771 * sending the second or later segment of a request,
772 * but the qp->s_state is set to OP(RDMA_READ_REQUEST)
773 * when the last segment of a previous request is
774 * received just before this; (3) We are re-sending a
775 * request.
776 */
777 if (qp->s_num_rd_atomic >= qp->s_max_rd_atomic) {
778 qp->s_flags |= RVT_S_WAIT_RDMAR;
779 goto bail;
780 }
781 if (newreq) {
782 struct tid_rdma_flow *flow =
783 &req->flows[req->setup_head];
784
785 /*
786 * Set up s_sge as it is needed for TID
787 * allocation. However, if the pages have been
788 * walked and mapped, skip it. An earlier try
789 * has failed to allocate the TID entries.
790 */
791 if (!flow->npagesets) {
792 qp->s_sge.sge = wqe->sg_list[0];
793 qp->s_sge.sg_list = wqe->sg_list + 1;
794 qp->s_sge.num_sge = wqe->wr.num_sge;
795 qp->s_sge.total_len = wqe->length;
796 qp->s_len = wqe->length;
797 req->isge = 0;
798 req->clear_tail = req->setup_head;
799 req->flow_idx = req->setup_head;
800 req->state = TID_REQUEST_ACTIVE;
801 }
802 } else if (delta == 0) {
803 /* Re-send a request */
804 req->cur_seg = 0;
805 req->comp_seg = 0;
806 req->ack_pending = 0;
807 req->flow_idx = req->clear_tail;
808 req->state = TID_REQUEST_RESEND;
809 }
810 req->s_next_psn = qp->s_psn;
811 /* Read one segment at a time */
812 len = min_t(u32, req->seg_len,
813 wqe->length - req->seg_len * req->cur_seg);
814 delta = hfi1_build_tid_rdma_read_req(qp, wqe, ohdr,
815 &bth1, &bth2,
816 &len);
817 if (delta <= 0) {
818 /* Wait for TID space */
819 goto bail;
820 }
821 if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
822 qp->s_lsn++;
823 hwords += delta;
824 ss = &wpriv->ss;
825 /* Check if this is the last segment */
826 if (req->cur_seg >= req->total_segs &&
827 ++qp->s_cur == qp->s_size)
828 qp->s_cur = 0;
829 break;
830
831 case IB_WR_ATOMIC_CMP_AND_SWP:
832 case IB_WR_ATOMIC_FETCH_AND_ADD:
833 /*
834 * Don't allow more operations to be started
835 * than the QP limits allow.
836 */
837 if (qp->s_num_rd_atomic >=
838 qp->s_max_rd_atomic) {
839 qp->s_flags |= RVT_S_WAIT_RDMAR;
840 goto bail;
841 }
842 qp->s_num_rd_atomic++;
843 fallthrough;
844 case IB_WR_OPFN:
845 if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
846 qp->s_lsn++;
847 if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
848 wqe->wr.opcode == IB_WR_OPFN) {
849 qp->s_state = OP(COMPARE_SWAP);
850 put_ib_ateth_swap(wqe->atomic_wr.swap,
851 &ohdr->u.atomic_eth);
852 put_ib_ateth_compare(wqe->atomic_wr.compare_add,
853 &ohdr->u.atomic_eth);
854 } else {
855 qp->s_state = OP(FETCH_ADD);
856 put_ib_ateth_swap(wqe->atomic_wr.compare_add,
857 &ohdr->u.atomic_eth);
858 put_ib_ateth_compare(0, &ohdr->u.atomic_eth);
859 }
860 put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr,
861 &ohdr->u.atomic_eth);
862 ohdr->u.atomic_eth.rkey = cpu_to_be32(
863 wqe->atomic_wr.rkey);
864 hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
865 ss = NULL;
866 len = 0;
867 bth2 |= IB_BTH_REQ_ACK;
868 if (++qp->s_cur == qp->s_size)
869 qp->s_cur = 0;
870 break;
871
872 default:
873 goto bail;
874 }
875 if (wqe->wr.opcode != IB_WR_TID_RDMA_READ) {
876 qp->s_sge.sge = wqe->sg_list[0];
877 qp->s_sge.sg_list = wqe->sg_list + 1;
878 qp->s_sge.num_sge = wqe->wr.num_sge;
879 qp->s_sge.total_len = wqe->length;
880 qp->s_len = wqe->length;
881 }
882 if (newreq) {
883 qp->s_tail++;
884 if (qp->s_tail >= qp->s_size)
885 qp->s_tail = 0;
886 }
887 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
888 wqe->wr.opcode == IB_WR_TID_RDMA_WRITE)
889 qp->s_psn = wqe->lpsn + 1;
890 else if (wqe->wr.opcode == IB_WR_TID_RDMA_READ)
891 qp->s_psn = req->s_next_psn;
892 else
893 qp->s_psn++;
894 break;
895
896 case OP(RDMA_READ_RESPONSE_FIRST):
897 /*
898 * qp->s_state is normally set to the opcode of the
899 * last packet constructed for new requests and therefore
900 * is never set to RDMA read response.
901 * RDMA_READ_RESPONSE_FIRST is used by the ACK processing
902 * thread to indicate a SEND needs to be restarted from an
903 * earlier PSN without interfering with the sending thread.
904 * See restart_rc().
905 */
906 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
907 fallthrough;
908 case OP(SEND_FIRST):
909 qp->s_state = OP(SEND_MIDDLE);
910 fallthrough;
911 case OP(SEND_MIDDLE):
912 bth2 = mask_psn(qp->s_psn++);
913 ss = &qp->s_sge;
914 len = qp->s_len;
915 if (len > pmtu) {
916 len = pmtu;
917 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
918 break;
919 }
920 if (wqe->wr.opcode == IB_WR_SEND) {
921 qp->s_state = OP(SEND_LAST);
922 } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
923 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
924 /* Immediate data comes after the BTH */
925 ohdr->u.imm_data = wqe->wr.ex.imm_data;
926 hwords += 1;
927 } else {
928 qp->s_state = OP(SEND_LAST_WITH_INVALIDATE);
929 /* invalidate data comes after the BTH */
930 ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey);
931 hwords += 1;
932 }
933 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
934 bth0 |= IB_BTH_SOLICITED;
935 bth2 |= IB_BTH_REQ_ACK;
936 qp->s_cur++;
937 if (qp->s_cur >= qp->s_size)
938 qp->s_cur = 0;
939 break;
940
941 case OP(RDMA_READ_RESPONSE_LAST):
942 /*
943 * qp->s_state is normally set to the opcode of the
944 * last packet constructed for new requests and therefore
945 * is never set to RDMA read response.
946 * RDMA_READ_RESPONSE_LAST is used by the ACK processing
947 * thread to indicate a RDMA write needs to be restarted from
948 * an earlier PSN without interfering with the sending thread.
949 * See restart_rc().
950 */
951 qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
952 fallthrough;
953 case OP(RDMA_WRITE_FIRST):
954 qp->s_state = OP(RDMA_WRITE_MIDDLE);
955 fallthrough;
956 case OP(RDMA_WRITE_MIDDLE):
957 bth2 = mask_psn(qp->s_psn++);
958 ss = &qp->s_sge;
959 len = qp->s_len;
960 if (len > pmtu) {
961 len = pmtu;
962 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
963 break;
964 }
965 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
966 qp->s_state = OP(RDMA_WRITE_LAST);
967 } else {
968 qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
969 /* Immediate data comes after the BTH */
970 ohdr->u.imm_data = wqe->wr.ex.imm_data;
971 hwords += 1;
972 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
973 bth0 |= IB_BTH_SOLICITED;
974 }
975 bth2 |= IB_BTH_REQ_ACK;
976 qp->s_cur++;
977 if (qp->s_cur >= qp->s_size)
978 qp->s_cur = 0;
979 break;
980
981 case OP(RDMA_READ_RESPONSE_MIDDLE):
982 /*
983 * qp->s_state is normally set to the opcode of the
984 * last packet constructed for new requests and therefore
985 * is never set to RDMA read response.
986 * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing
987 * thread to indicate a RDMA read needs to be restarted from
988 * an earlier PSN without interfering with the sending thread.
989 * See restart_rc().
990 */
991 len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu;
992 put_ib_reth_vaddr(
993 wqe->rdma_wr.remote_addr + len,
994 &ohdr->u.rc.reth);
995 ohdr->u.rc.reth.rkey =
996 cpu_to_be32(wqe->rdma_wr.rkey);
997 ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len);
998 qp->s_state = OP(RDMA_READ_REQUEST);
999 hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
1000 bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK;
1001 qp->s_psn = wqe->lpsn + 1;
1002 ss = NULL;
1003 len = 0;
1004 qp->s_cur++;
1005 if (qp->s_cur == qp->s_size)
1006 qp->s_cur = 0;
1007 break;
1008
1009 case TID_OP(WRITE_RESP):
1010 /*
1011 * This value for s_state is used for restarting a TID RDMA
1012 * WRITE request. See comment in OP(RDMA_READ_RESPONSE_MIDDLE
1013 * for more).
1014 */
1015 req = wqe_to_tid_req(wqe);
1016 req->state = TID_REQUEST_RESEND;
1017 rcu_read_lock();
1018 remote = rcu_dereference(priv->tid_rdma.remote);
1019 req->comp_seg = delta_psn(qp->s_psn, wqe->psn);
1020 len = wqe->length - (req->comp_seg * remote->max_len);
1021 rcu_read_unlock();
1022
1023 bth2 = mask_psn(qp->s_psn);
1024 hwords += hfi1_build_tid_rdma_write_req(qp, wqe, ohdr, &bth1,
1025 &bth2, &len);
1026 qp->s_psn = wqe->lpsn + 1;
1027 ss = NULL;
1028 qp->s_state = TID_OP(WRITE_REQ);
1029 priv->pending_tid_w_resp += delta_psn(wqe->lpsn, bth2) + 1;
1030 priv->s_tid_cur = qp->s_cur;
1031 if (++qp->s_cur == qp->s_size)
1032 qp->s_cur = 0;
1033 trace_hfi1_tid_req_make_req_write(qp, 0, wqe->wr.opcode,
1034 wqe->psn, wqe->lpsn, req);
1035 break;
1036
1037 case TID_OP(READ_RESP):
1038 if (wqe->wr.opcode != IB_WR_TID_RDMA_READ)
1039 goto bail;
1040 /* This is used to restart a TID read request */
1041 req = wqe_to_tid_req(wqe);
1042 wpriv = wqe->priv;
1043 /*
1044 * Back down. The field qp->s_psn has been set to the psn with
1045 * which the request should be restart. It's OK to use division
1046 * as this is on the retry path.
1047 */
1048 req->cur_seg = delta_psn(qp->s_psn, wqe->psn) / priv->pkts_ps;
1049
1050 /*
1051 * The following function need to be redefined to return the
1052 * status to make sure that we find the flow. At the same
1053 * time, we can use the req->state change to check if the
1054 * call succeeds or not.
1055 */
1056 req->state = TID_REQUEST_RESEND;
1057 hfi1_tid_rdma_restart_req(qp, wqe, &bth2);
1058 if (req->state != TID_REQUEST_ACTIVE) {
1059 /*
1060 * Failed to find the flow. Release all allocated tid
1061 * resources.
1062 */
1063 hfi1_kern_exp_rcv_clear_all(req);
1064 hfi1_kern_clear_hw_flow(priv->rcd, qp);
1065
1066 hfi1_trdma_send_complete(qp, wqe, IB_WC_LOC_QP_OP_ERR);
1067 goto bail;
1068 }
1069 req->state = TID_REQUEST_RESEND;
1070 len = min_t(u32, req->seg_len,
1071 wqe->length - req->seg_len * req->cur_seg);
1072 flow = &req->flows[req->flow_idx];
1073 len -= flow->sent;
1074 req->s_next_psn = flow->flow_state.ib_lpsn + 1;
1075 delta = hfi1_build_tid_rdma_read_packet(wqe, ohdr, &bth1,
1076 &bth2, &len);
1077 if (delta <= 0) {
1078 /* Wait for TID space */
1079 goto bail;
1080 }
1081 hwords += delta;
1082 ss = &wpriv->ss;
1083 /* Check if this is the last segment */
1084 if (req->cur_seg >= req->total_segs &&
1085 ++qp->s_cur == qp->s_size)
1086 qp->s_cur = 0;
1087 qp->s_psn = req->s_next_psn;
1088 trace_hfi1_tid_req_make_req_read(qp, 0, wqe->wr.opcode,
1089 wqe->psn, wqe->lpsn, req);
1090 break;
1091 case TID_OP(READ_REQ):
1092 req = wqe_to_tid_req(wqe);
1093 delta = cmp_psn(qp->s_psn, wqe->psn);
1094 /*
1095 * If the current WR is not TID RDMA READ, or this is the start
1096 * of a new request, we need to change the qp->s_state so that
1097 * the request can be set up properly.
1098 */
1099 if (wqe->wr.opcode != IB_WR_TID_RDMA_READ || delta == 0 ||
1100 qp->s_cur == qp->s_tail) {
1101 qp->s_state = OP(RDMA_READ_REQUEST);
1102 if (delta == 0 || qp->s_cur == qp->s_tail)
1103 goto check_s_state;
1104 else
1105 goto bail;
1106 }
1107
1108 /* Rate limiting */
1109 if (qp->s_num_rd_atomic >= qp->s_max_rd_atomic) {
1110 qp->s_flags |= RVT_S_WAIT_RDMAR;
1111 goto bail;
1112 }
1113
1114 wpriv = wqe->priv;
1115 /* Read one segment at a time */
1116 len = min_t(u32, req->seg_len,
1117 wqe->length - req->seg_len * req->cur_seg);
1118 delta = hfi1_build_tid_rdma_read_req(qp, wqe, ohdr, &bth1,
1119 &bth2, &len);
1120 if (delta <= 0) {
1121 /* Wait for TID space */
1122 goto bail;
1123 }
1124 hwords += delta;
1125 ss = &wpriv->ss;
1126 /* Check if this is the last segment */
1127 if (req->cur_seg >= req->total_segs &&
1128 ++qp->s_cur == qp->s_size)
1129 qp->s_cur = 0;
1130 qp->s_psn = req->s_next_psn;
1131 trace_hfi1_tid_req_make_req_read(qp, 0, wqe->wr.opcode,
1132 wqe->psn, wqe->lpsn, req);
1133 break;
1134 }
1135 qp->s_sending_hpsn = bth2;
1136 delta = delta_psn(bth2, wqe->psn);
1137 if (delta && delta % HFI1_PSN_CREDIT == 0 &&
1138 wqe->wr.opcode != IB_WR_TID_RDMA_WRITE)
1139 bth2 |= IB_BTH_REQ_ACK;
1140 if (qp->s_flags & RVT_S_SEND_ONE) {
1141 qp->s_flags &= ~RVT_S_SEND_ONE;
1142 qp->s_flags |= RVT_S_WAIT_ACK;
1143 bth2 |= IB_BTH_REQ_ACK;
1144 }
1145 qp->s_len -= len;
1146 ps->s_txreq->hdr_dwords = hwords;
1147 ps->s_txreq->sde = priv->s_sde;
1148 ps->s_txreq->ss = ss;
1149 ps->s_txreq->s_cur_size = len;
1150 hfi1_make_ruc_header(
1151 qp,
1152 ohdr,
1153 bth0 | (qp->s_state << 24),
1154 bth1,
1155 bth2,
1156 middle,
1157 ps);
1158 return 1;
1159
1160done_free_tx:
1161 hfi1_put_txreq(ps->s_txreq);
1162 ps->s_txreq = NULL;
1163 return 1;
1164
1165bail:
1166 hfi1_put_txreq(ps->s_txreq);
1167
1168bail_no_tx:
1169 ps->s_txreq = NULL;
1170 qp->s_flags &= ~RVT_S_BUSY;
1171 /*
1172 * If we didn't get a txreq, the QP will be woken up later to try
1173 * again. Set the flags to indicate which work item to wake
1174 * up.
1175 */
1176 iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
1177 return 0;
1178}
1179
1180static inline void hfi1_make_bth_aeth(struct rvt_qp *qp,
1181 struct ib_other_headers *ohdr,
1182 u32 bth0, u32 bth1)
1183{
1184 if (qp->r_nak_state)
1185 ohdr->u.aeth = cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
1186 (qp->r_nak_state <<
1187 IB_AETH_CREDIT_SHIFT));
1188 else
1189 ohdr->u.aeth = rvt_compute_aeth(qp);
1190
1191 ohdr->bth[0] = cpu_to_be32(bth0);
1192 ohdr->bth[1] = cpu_to_be32(bth1 | qp->remote_qpn);
1193 ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn));
1194}
1195
1196static inline void hfi1_queue_rc_ack(struct hfi1_packet *packet, bool is_fecn)
1197{
1198 struct rvt_qp *qp = packet->qp;
1199 struct hfi1_ibport *ibp;
1200 unsigned long flags;
1201
1202 spin_lock_irqsave(&qp->s_lock, flags);
1203 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK))
1204 goto unlock;
1205 ibp = rcd_to_iport(packet->rcd);
1206 this_cpu_inc(*ibp->rvp.rc_qacks);
1207 qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING;
1208 qp->s_nak_state = qp->r_nak_state;
1209 qp->s_ack_psn = qp->r_ack_psn;
1210 if (is_fecn)
1211 qp->s_flags |= RVT_S_ECN;
1212
1213 /* Schedule the send tasklet. */
1214 hfi1_schedule_send(qp);
1215unlock:
1216 spin_unlock_irqrestore(&qp->s_lock, flags);
1217}
1218
1219static inline void hfi1_make_rc_ack_9B(struct hfi1_packet *packet,
1220 struct hfi1_opa_header *opa_hdr,
1221 u8 sc5, bool is_fecn,
1222 u64 *pbc_flags, u32 *hwords,
1223 u32 *nwords)
1224{
1225 struct rvt_qp *qp = packet->qp;
1226 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
1227 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
1228 struct ib_header *hdr = &opa_hdr->ibh;
1229 struct ib_other_headers *ohdr;
1230 u16 lrh0 = HFI1_LRH_BTH;
1231 u16 pkey;
1232 u32 bth0, bth1;
1233
1234 opa_hdr->hdr_type = HFI1_PKT_TYPE_9B;
1235 ohdr = &hdr->u.oth;
1236 /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */
1237 *hwords = 6;
1238
1239 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
1240 *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh,
1241 rdma_ah_read_grh(&qp->remote_ah_attr),
1242 *hwords - 2, SIZE_OF_CRC);
1243 ohdr = &hdr->u.l.oth;
1244 lrh0 = HFI1_LRH_GRH;
1245 }
1246 /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */
1247 *pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT);
1248
1249 /* read pkey_index w/o lock (its atomic) */
1250 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
1251
1252 lrh0 |= (sc5 & IB_SC_MASK) << IB_SC_SHIFT |
1253 (rdma_ah_get_sl(&qp->remote_ah_attr) & IB_SL_MASK) <<
1254 IB_SL_SHIFT;
1255
1256 hfi1_make_ib_hdr(hdr, lrh0, *hwords + SIZE_OF_CRC,
1257 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B),
1258 ppd->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr));
1259
1260 bth0 = pkey | (OP(ACKNOWLEDGE) << 24);
1261 if (qp->s_mig_state == IB_MIG_MIGRATED)
1262 bth0 |= IB_BTH_MIG_REQ;
1263 bth1 = (!!is_fecn) << IB_BECN_SHIFT;
1264 /*
1265 * Inline ACKs go out without the use of the Verbs send engine, so
1266 * we need to set the STL Verbs Extended bit here
1267 */
1268 bth1 |= HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT;
1269 hfi1_make_bth_aeth(qp, ohdr, bth0, bth1);
1270}
1271
1272static inline void hfi1_make_rc_ack_16B(struct hfi1_packet *packet,
1273 struct hfi1_opa_header *opa_hdr,
1274 u8 sc5, bool is_fecn,
1275 u64 *pbc_flags, u32 *hwords,
1276 u32 *nwords)
1277{
1278 struct rvt_qp *qp = packet->qp;
1279 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
1280 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
1281 struct hfi1_16b_header *hdr = &opa_hdr->opah;
1282 struct ib_other_headers *ohdr;
1283 u32 bth0, bth1 = 0;
1284 u16 len, pkey;
1285 bool becn = is_fecn;
1286 u8 l4 = OPA_16B_L4_IB_LOCAL;
1287 u8 extra_bytes;
1288
1289 opa_hdr->hdr_type = HFI1_PKT_TYPE_16B;
1290 ohdr = &hdr->u.oth;
1291 /* header size in 32-bit words 16B LRH+BTH+AETH = (16+12+4)/4 */
1292 *hwords = 8;
1293 extra_bytes = hfi1_get_16b_padding(*hwords << 2, 0);
1294 *nwords = SIZE_OF_CRC + ((extra_bytes + SIZE_OF_LT) >> 2);
1295
1296 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
1297 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) {
1298 *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh,
1299 rdma_ah_read_grh(&qp->remote_ah_attr),
1300 *hwords - 4, *nwords);
1301 ohdr = &hdr->u.l.oth;
1302 l4 = OPA_16B_L4_IB_GLOBAL;
1303 }
1304 *pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
1305
1306 /* read pkey_index w/o lock (its atomic) */
1307 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
1308
1309 /* Convert dwords to flits */
1310 len = (*hwords + *nwords) >> 1;
1311
1312 hfi1_make_16b_hdr(hdr, ppd->lid |
1313 (rdma_ah_get_path_bits(&qp->remote_ah_attr) &
1314 ((1 << ppd->lmc) - 1)),
1315 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr),
1316 16B), len, pkey, becn, 0, l4, sc5);
1317
1318 bth0 = pkey | (OP(ACKNOWLEDGE) << 24);
1319 bth0 |= extra_bytes << 20;
1320 if (qp->s_mig_state == IB_MIG_MIGRATED)
1321 bth1 = OPA_BTH_MIG_REQ;
1322 hfi1_make_bth_aeth(qp, ohdr, bth0, bth1);
1323}
1324
1325typedef void (*hfi1_make_rc_ack)(struct hfi1_packet *packet,
1326 struct hfi1_opa_header *opa_hdr,
1327 u8 sc5, bool is_fecn,
1328 u64 *pbc_flags, u32 *hwords,
1329 u32 *nwords);
1330
1331/* We support only two types - 9B and 16B for now */
1332static const hfi1_make_rc_ack hfi1_make_rc_ack_tbl[2] = {
1333 [HFI1_PKT_TYPE_9B] = &hfi1_make_rc_ack_9B,
1334 [HFI1_PKT_TYPE_16B] = &hfi1_make_rc_ack_16B
1335};
1336
1337/*
1338 * hfi1_send_rc_ack - Construct an ACK packet and send it
1339 *
1340 * This is called from hfi1_rc_rcv() and handle_receive_interrupt().
1341 * Note that RDMA reads and atomics are handled in the
1342 * send side QP state and send engine.
1343 */
1344void hfi1_send_rc_ack(struct hfi1_packet *packet, bool is_fecn)
1345{
1346 struct hfi1_ctxtdata *rcd = packet->rcd;
1347 struct rvt_qp *qp = packet->qp;
1348 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
1349 struct hfi1_qp_priv *priv = qp->priv;
1350 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
1351 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
1352 u64 pbc, pbc_flags = 0;
1353 u32 hwords = 0;
1354 u32 nwords = 0;
1355 u32 plen;
1356 struct pio_buf *pbuf;
1357 struct hfi1_opa_header opa_hdr;
1358
1359 /* clear the defer count */
1360 qp->r_adefered = 0;
1361
1362 /* Don't send ACK or NAK if a RDMA read or atomic is pending. */
1363 if (qp->s_flags & RVT_S_RESP_PENDING) {
1364 hfi1_queue_rc_ack(packet, is_fecn);
1365 return;
1366 }
1367
1368 /* Ensure s_rdma_ack_cnt changes are committed */
1369 if (qp->s_rdma_ack_cnt) {
1370 hfi1_queue_rc_ack(packet, is_fecn);
1371 return;
1372 }
1373
1374 /* Don't try to send ACKs if the link isn't ACTIVE */
1375 if (driver_lstate(ppd) != IB_PORT_ACTIVE)
1376 return;
1377
1378 /* Make the appropriate header */
1379 hfi1_make_rc_ack_tbl[priv->hdr_type](packet, &opa_hdr, sc5, is_fecn,
1380 &pbc_flags, &hwords, &nwords);
1381
1382 plen = 2 /* PBC */ + hwords + nwords;
1383 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps,
1384 sc_to_vlt(ppd->dd, sc5), plen);
1385 pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL);
1386 if (IS_ERR_OR_NULL(pbuf)) {
1387 /*
1388 * We have no room to send at the moment. Pass
1389 * responsibility for sending the ACK to the send engine
1390 * so that when enough buffer space becomes available,
1391 * the ACK is sent ahead of other outgoing packets.
1392 */
1393 hfi1_queue_rc_ack(packet, is_fecn);
1394 return;
1395 }
1396 trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
1397 &opa_hdr, ib_is_sc5(sc5));
1398
1399 /* write the pbc and data */
1400 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
1401 (priv->hdr_type == HFI1_PKT_TYPE_9B ?
1402 (void *)&opa_hdr.ibh :
1403 (void *)&opa_hdr.opah), hwords);
1404 return;
1405}
1406
1407/**
1408 * update_num_rd_atomic - update the qp->s_num_rd_atomic
1409 * @qp: the QP
1410 * @psn: the packet sequence number to restart at
1411 * @wqe: the wqe
1412 *
1413 * This is called from reset_psn() to update qp->s_num_rd_atomic
1414 * for the current wqe.
1415 * Called at interrupt level with the QP s_lock held.
1416 */
1417static void update_num_rd_atomic(struct rvt_qp *qp, u32 psn,
1418 struct rvt_swqe *wqe)
1419{
1420 u32 opcode = wqe->wr.opcode;
1421
1422 if (opcode == IB_WR_RDMA_READ ||
1423 opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
1424 opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
1425 qp->s_num_rd_atomic++;
1426 } else if (opcode == IB_WR_TID_RDMA_READ) {
1427 struct tid_rdma_request *req = wqe_to_tid_req(wqe);
1428 struct hfi1_qp_priv *priv = qp->priv;
1429
1430 if (cmp_psn(psn, wqe->lpsn) <= 0) {
1431 u32 cur_seg;
1432
1433 cur_seg = (psn - wqe->psn) / priv->pkts_ps;
1434 req->ack_pending = cur_seg - req->comp_seg;
1435 priv->pending_tid_r_segs += req->ack_pending;
1436 qp->s_num_rd_atomic += req->ack_pending;
1437 trace_hfi1_tid_req_update_num_rd_atomic(qp, 0,
1438 wqe->wr.opcode,
1439 wqe->psn,
1440 wqe->lpsn,
1441 req);
1442 } else {
1443 priv->pending_tid_r_segs += req->total_segs;
1444 qp->s_num_rd_atomic += req->total_segs;
1445 }
1446 }
1447}
1448
1449/**
1450 * reset_psn - reset the QP state to send starting from PSN
1451 * @qp: the QP
1452 * @psn: the packet sequence number to restart at
1453 *
1454 * This is called from hfi1_rc_rcv() to process an incoming RC ACK
1455 * for the given QP.
1456 * Called at interrupt level with the QP s_lock held.
1457 */
1458static void reset_psn(struct rvt_qp *qp, u32 psn)
1459{
1460 u32 n = qp->s_acked;
1461 struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n);
1462 u32 opcode;
1463 struct hfi1_qp_priv *priv = qp->priv;
1464
1465 lockdep_assert_held(&qp->s_lock);
1466 qp->s_cur = n;
1467 priv->pending_tid_r_segs = 0;
1468 priv->pending_tid_w_resp = 0;
1469 qp->s_num_rd_atomic = 0;
1470
1471 /*
1472 * If we are starting the request from the beginning,
1473 * let the normal send code handle initialization.
1474 */
1475 if (cmp_psn(psn, wqe->psn) <= 0) {
1476 qp->s_state = OP(SEND_LAST);
1477 goto done;
1478 }
1479 update_num_rd_atomic(qp, psn, wqe);
1480
1481 /* Find the work request opcode corresponding to the given PSN. */
1482 for (;;) {
1483 int diff;
1484
1485 if (++n == qp->s_size)
1486 n = 0;
1487 if (n == qp->s_tail)
1488 break;
1489 wqe = rvt_get_swqe_ptr(qp, n);
1490 diff = cmp_psn(psn, wqe->psn);
1491 if (diff < 0) {
1492 /* Point wqe back to the previous one*/
1493 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
1494 break;
1495 }
1496 qp->s_cur = n;
1497 /*
1498 * If we are starting the request from the beginning,
1499 * let the normal send code handle initialization.
1500 */
1501 if (diff == 0) {
1502 qp->s_state = OP(SEND_LAST);
1503 goto done;
1504 }
1505
1506 update_num_rd_atomic(qp, psn, wqe);
1507 }
1508 opcode = wqe->wr.opcode;
1509
1510 /*
1511 * Set the state to restart in the middle of a request.
1512 * Don't change the s_sge, s_cur_sge, or s_cur_size.
1513 * See hfi1_make_rc_req().
1514 */
1515 switch (opcode) {
1516 case IB_WR_SEND:
1517 case IB_WR_SEND_WITH_IMM:
1518 qp->s_state = OP(RDMA_READ_RESPONSE_FIRST);
1519 break;
1520
1521 case IB_WR_RDMA_WRITE:
1522 case IB_WR_RDMA_WRITE_WITH_IMM:
1523 qp->s_state = OP(RDMA_READ_RESPONSE_LAST);
1524 break;
1525
1526 case IB_WR_TID_RDMA_WRITE:
1527 qp->s_state = TID_OP(WRITE_RESP);
1528 break;
1529
1530 case IB_WR_RDMA_READ:
1531 qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE);
1532 break;
1533
1534 case IB_WR_TID_RDMA_READ:
1535 qp->s_state = TID_OP(READ_RESP);
1536 break;
1537
1538 default:
1539 /*
1540 * This case shouldn't happen since its only
1541 * one PSN per req.
1542 */
1543 qp->s_state = OP(SEND_LAST);
1544 }
1545done:
1546 priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK;
1547 qp->s_psn = psn;
1548 /*
1549 * Set RVT_S_WAIT_PSN as rc_complete() may start the timer
1550 * asynchronously before the send engine can get scheduled.
1551 * Doing it in hfi1_make_rc_req() is too late.
1552 */
1553 if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) &&
1554 (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0))
1555 qp->s_flags |= RVT_S_WAIT_PSN;
1556 qp->s_flags &= ~HFI1_S_AHG_VALID;
1557 trace_hfi1_sender_reset_psn(qp);
1558}
1559
1560/*
1561 * Back up requester to resend the last un-ACKed request.
1562 * The QP r_lock and s_lock should be held and interrupts disabled.
1563 */
1564void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait)
1565{
1566 struct hfi1_qp_priv *priv = qp->priv;
1567 struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1568 struct hfi1_ibport *ibp;
1569
1570 lockdep_assert_held(&qp->r_lock);
1571 lockdep_assert_held(&qp->s_lock);
1572 trace_hfi1_sender_restart_rc(qp);
1573 if (qp->s_retry == 0) {
1574 if (qp->s_mig_state == IB_MIG_ARMED) {
1575 hfi1_migrate_qp(qp);
1576 qp->s_retry = qp->s_retry_cnt;
1577 } else if (qp->s_last == qp->s_acked) {
1578 /*
1579 * We need special handling for the OPFN request WQEs as
1580 * they are not allowed to generate real user errors
1581 */
1582 if (wqe->wr.opcode == IB_WR_OPFN) {
1583 struct hfi1_ibport *ibp =
1584 to_iport(qp->ibqp.device, qp->port_num);
1585 /*
1586 * Call opfn_conn_reply() with capcode and
1587 * remaining data as 0 to close out the
1588 * current request
1589 */
1590 opfn_conn_reply(qp, priv->opfn.curr);
1591 wqe = do_rc_completion(qp, wqe, ibp);
1592 qp->s_flags &= ~RVT_S_WAIT_ACK;
1593 } else {
1594 trace_hfi1_tid_write_sender_restart_rc(qp, 0);
1595 if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) {
1596 struct tid_rdma_request *req;
1597
1598 req = wqe_to_tid_req(wqe);
1599 hfi1_kern_exp_rcv_clear_all(req);
1600 hfi1_kern_clear_hw_flow(priv->rcd, qp);
1601 }
1602
1603 hfi1_trdma_send_complete(qp, wqe,
1604 IB_WC_RETRY_EXC_ERR);
1605 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
1606 }
1607 return;
1608 } else { /* need to handle delayed completion */
1609 return;
1610 }
1611 } else {
1612 qp->s_retry--;
1613 }
1614
1615 ibp = to_iport(qp->ibqp.device, qp->port_num);
1616 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
1617 wqe->wr.opcode == IB_WR_TID_RDMA_READ)
1618 ibp->rvp.n_rc_resends++;
1619 else
1620 ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn);
1621
1622 qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR |
1623 RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN |
1624 RVT_S_WAIT_ACK | HFI1_S_WAIT_TID_RESP);
1625 if (wait)
1626 qp->s_flags |= RVT_S_SEND_ONE;
1627 reset_psn(qp, psn);
1628}
1629
1630/*
1631 * Set qp->s_sending_psn to the next PSN after the given one.
1632 * This would be psn+1 except when RDMA reads or TID RDMA ops
1633 * are present.
1634 */
1635static void reset_sending_psn(struct rvt_qp *qp, u32 psn)
1636{
1637 struct rvt_swqe *wqe;
1638 u32 n = qp->s_last;
1639
1640 lockdep_assert_held(&qp->s_lock);
1641 /* Find the work request corresponding to the given PSN. */
1642 for (;;) {
1643 wqe = rvt_get_swqe_ptr(qp, n);
1644 if (cmp_psn(psn, wqe->lpsn) <= 0) {
1645 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
1646 wqe->wr.opcode == IB_WR_TID_RDMA_READ ||
1647 wqe->wr.opcode == IB_WR_TID_RDMA_WRITE)
1648 qp->s_sending_psn = wqe->lpsn + 1;
1649 else
1650 qp->s_sending_psn = psn + 1;
1651 break;
1652 }
1653 if (++n == qp->s_size)
1654 n = 0;
1655 if (n == qp->s_tail)
1656 break;
1657 }
1658}
1659
1660/**
1661 * hfi1_rc_verbs_aborted - handle abort status
1662 * @qp: the QP
1663 * @opah: the opa header
1664 *
1665 * This code modifies both ACK bit in BTH[2]
1666 * and the s_flags to go into send one mode.
1667 *
1668 * This serves to throttle the send engine to only
1669 * send a single packet in the likely case the
1670 * a link has gone down.
1671 */
1672void hfi1_rc_verbs_aborted(struct rvt_qp *qp, struct hfi1_opa_header *opah)
1673{
1674 struct ib_other_headers *ohdr = hfi1_get_rc_ohdr(opah);
1675 u8 opcode = ib_bth_get_opcode(ohdr);
1676 u32 psn;
1677
1678 /* ignore responses */
1679 if ((opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
1680 opcode <= OP(ATOMIC_ACKNOWLEDGE)) ||
1681 opcode == TID_OP(READ_RESP) ||
1682 opcode == TID_OP(WRITE_RESP))
1683 return;
1684
1685 psn = ib_bth_get_psn(ohdr) | IB_BTH_REQ_ACK;
1686 ohdr->bth[2] = cpu_to_be32(psn);
1687 qp->s_flags |= RVT_S_SEND_ONE;
1688}
1689
1690/*
1691 * This should be called with the QP s_lock held and interrupts disabled.
1692 */
1693void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah)
1694{
1695 struct ib_other_headers *ohdr;
1696 struct hfi1_qp_priv *priv = qp->priv;
1697 struct rvt_swqe *wqe;
1698 u32 opcode, head, tail;
1699 u32 psn;
1700 struct tid_rdma_request *req;
1701
1702 lockdep_assert_held(&qp->s_lock);
1703 if (!(ib_rvt_state_ops[qp->state] & RVT_SEND_OR_FLUSH_OR_RECV_OK))
1704 return;
1705
1706 ohdr = hfi1_get_rc_ohdr(opah);
1707 opcode = ib_bth_get_opcode(ohdr);
1708 if ((opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
1709 opcode <= OP(ATOMIC_ACKNOWLEDGE)) ||
1710 opcode == TID_OP(READ_RESP) ||
1711 opcode == TID_OP(WRITE_RESP)) {
1712 WARN_ON(!qp->s_rdma_ack_cnt);
1713 qp->s_rdma_ack_cnt--;
1714 return;
1715 }
1716
1717 psn = ib_bth_get_psn(ohdr);
1718 /*
1719 * Don't attempt to reset the sending PSN for packets in the
1720 * KDETH PSN space since the PSN does not match anything.
1721 */
1722 if (opcode != TID_OP(WRITE_DATA) &&
1723 opcode != TID_OP(WRITE_DATA_LAST) &&
1724 opcode != TID_OP(ACK) && opcode != TID_OP(RESYNC))
1725 reset_sending_psn(qp, psn);
1726
1727 /* Handle TID RDMA WRITE packets differently */
1728 if (opcode >= TID_OP(WRITE_REQ) &&
1729 opcode <= TID_OP(WRITE_DATA_LAST)) {
1730 head = priv->s_tid_head;
1731 tail = priv->s_tid_cur;
1732 /*
1733 * s_tid_cur is set to s_tid_head in the case, where
1734 * a new TID RDMA request is being started and all
1735 * previous ones have been completed.
1736 * Therefore, we need to do a secondary check in order
1737 * to properly determine whether we should start the
1738 * RC timer.
1739 */
1740 wqe = rvt_get_swqe_ptr(qp, tail);
1741 req = wqe_to_tid_req(wqe);
1742 if (head == tail && req->comp_seg < req->total_segs) {
1743 if (tail == 0)
1744 tail = qp->s_size - 1;
1745 else
1746 tail -= 1;
1747 }
1748 } else {
1749 head = qp->s_tail;
1750 tail = qp->s_acked;
1751 }
1752
1753 /*
1754 * Start timer after a packet requesting an ACK has been sent and
1755 * there are still requests that haven't been acked.
1756 */
1757 if ((psn & IB_BTH_REQ_ACK) && tail != head &&
1758 opcode != TID_OP(WRITE_DATA) && opcode != TID_OP(WRITE_DATA_LAST) &&
1759 opcode != TID_OP(RESYNC) &&
1760 !(qp->s_flags &
1761 (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) &&
1762 (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
1763 if (opcode == TID_OP(READ_REQ))
1764 rvt_add_retry_timer_ext(qp, priv->timeout_shift);
1765 else
1766 rvt_add_retry_timer(qp);
1767 }
1768
1769 /* Start TID RDMA ACK timer */
1770 if ((opcode == TID_OP(WRITE_DATA) ||
1771 opcode == TID_OP(WRITE_DATA_LAST) ||
1772 opcode == TID_OP(RESYNC)) &&
1773 (psn & IB_BTH_REQ_ACK) &&
1774 !(priv->s_flags & HFI1_S_TID_RETRY_TIMER) &&
1775 (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
1776 /*
1777 * The TID RDMA ACK packet could be received before this
1778 * function is called. Therefore, add the timer only if TID
1779 * RDMA ACK packets are actually pending.
1780 */
1781 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1782 req = wqe_to_tid_req(wqe);
1783 if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
1784 req->ack_seg < req->cur_seg)
1785 hfi1_add_tid_retry_timer(qp);
1786 }
1787
1788 while (qp->s_last != qp->s_acked) {
1789 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
1790 if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 &&
1791 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)
1792 break;
1793 trdma_clean_swqe(qp, wqe);
1794 trace_hfi1_qp_send_completion(qp, wqe, qp->s_last);
1795 rvt_qp_complete_swqe(qp,
1796 wqe,
1797 ib_hfi1_wc_opcode[wqe->wr.opcode],
1798 IB_WC_SUCCESS);
1799 }
1800 /*
1801 * If we were waiting for sends to complete before re-sending,
1802 * and they are now complete, restart sending.
1803 */
1804 trace_hfi1_sendcomplete(qp, psn);
1805 if (qp->s_flags & RVT_S_WAIT_PSN &&
1806 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1807 qp->s_flags &= ~RVT_S_WAIT_PSN;
1808 qp->s_sending_psn = qp->s_psn;
1809 qp->s_sending_hpsn = qp->s_psn - 1;
1810 hfi1_schedule_send(qp);
1811 }
1812}
1813
1814static inline void update_last_psn(struct rvt_qp *qp, u32 psn)
1815{
1816 qp->s_last_psn = psn;
1817}
1818
1819/*
1820 * Generate a SWQE completion.
1821 * This is similar to hfi1_send_complete but has to check to be sure
1822 * that the SGEs are not being referenced if the SWQE is being resent.
1823 */
1824struct rvt_swqe *do_rc_completion(struct rvt_qp *qp,
1825 struct rvt_swqe *wqe,
1826 struct hfi1_ibport *ibp)
1827{
1828 struct hfi1_qp_priv *priv = qp->priv;
1829
1830 lockdep_assert_held(&qp->s_lock);
1831 /*
1832 * Don't decrement refcount and don't generate a
1833 * completion if the SWQE is being resent until the send
1834 * is finished.
1835 */
1836 trace_hfi1_rc_completion(qp, wqe->lpsn);
1837 if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 ||
1838 cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
1839 trdma_clean_swqe(qp, wqe);
1840 trace_hfi1_qp_send_completion(qp, wqe, qp->s_last);
1841 rvt_qp_complete_swqe(qp,
1842 wqe,
1843 ib_hfi1_wc_opcode[wqe->wr.opcode],
1844 IB_WC_SUCCESS);
1845 } else {
1846 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
1847
1848 this_cpu_inc(*ibp->rvp.rc_delayed_comp);
1849 /*
1850 * If send progress not running attempt to progress
1851 * SDMA queue.
1852 */
1853 if (ppd->dd->flags & HFI1_HAS_SEND_DMA) {
1854 struct sdma_engine *engine;
1855 u8 sl = rdma_ah_get_sl(&qp->remote_ah_attr);
1856 u8 sc5;
1857
1858 /* For now use sc to find engine */
1859 sc5 = ibp->sl_to_sc[sl];
1860 engine = qp_to_sdma_engine(qp, sc5);
1861 sdma_engine_progress_schedule(engine);
1862 }
1863 }
1864
1865 qp->s_retry = qp->s_retry_cnt;
1866 /*
1867 * Don't update the last PSN if the request being completed is
1868 * a TID RDMA WRITE request.
1869 * Completion of the TID RDMA WRITE requests are done by the
1870 * TID RDMA ACKs and as such could be for a request that has
1871 * already been ACKed as far as the IB state machine is
1872 * concerned.
1873 */
1874 if (wqe->wr.opcode != IB_WR_TID_RDMA_WRITE)
1875 update_last_psn(qp, wqe->lpsn);
1876
1877 /*
1878 * If we are completing a request which is in the process of
1879 * being resent, we can stop re-sending it since we know the
1880 * responder has already seen it.
1881 */
1882 if (qp->s_acked == qp->s_cur) {
1883 if (++qp->s_cur >= qp->s_size)
1884 qp->s_cur = 0;
1885 qp->s_acked = qp->s_cur;
1886 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
1887 if (qp->s_acked != qp->s_tail) {
1888 qp->s_state = OP(SEND_LAST);
1889 qp->s_psn = wqe->psn;
1890 }
1891 } else {
1892 if (++qp->s_acked >= qp->s_size)
1893 qp->s_acked = 0;
1894 if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur)
1895 qp->s_draining = 0;
1896 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1897 }
1898 if (priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) {
1899 priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK;
1900 hfi1_schedule_send(qp);
1901 }
1902 return wqe;
1903}
1904
1905static void set_restart_qp(struct rvt_qp *qp, struct hfi1_ctxtdata *rcd)
1906{
1907 /* Retry this request. */
1908 if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) {
1909 qp->r_flags |= RVT_R_RDMAR_SEQ;
1910 hfi1_restart_rc(qp, qp->s_last_psn + 1, 0);
1911 if (list_empty(&qp->rspwait)) {
1912 qp->r_flags |= RVT_R_RSP_SEND;
1913 rvt_get_qp(qp);
1914 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
1915 }
1916 }
1917}
1918
1919/**
1920 * update_qp_retry_state - Update qp retry state.
1921 * @qp: the QP
1922 * @psn: the packet sequence number of the TID RDMA WRITE RESP.
1923 * @spsn: The start psn for the given TID RDMA WRITE swqe.
1924 * @lpsn: The last psn for the given TID RDMA WRITE swqe.
1925 *
1926 * This function is called to update the qp retry state upon
1927 * receiving a TID WRITE RESP after the qp is scheduled to retry
1928 * a request.
1929 */
1930static void update_qp_retry_state(struct rvt_qp *qp, u32 psn, u32 spsn,
1931 u32 lpsn)
1932{
1933 struct hfi1_qp_priv *qpriv = qp->priv;
1934
1935 qp->s_psn = psn + 1;
1936 /*
1937 * If this is the first TID RDMA WRITE RESP packet for the current
1938 * request, change the s_state so that the retry will be processed
1939 * correctly. Similarly, if this is the last TID RDMA WRITE RESP
1940 * packet, change the s_state and advance the s_cur.
1941 */
1942 if (cmp_psn(psn, lpsn) >= 0) {
1943 qp->s_cur = qpriv->s_tid_cur + 1;
1944 if (qp->s_cur >= qp->s_size)
1945 qp->s_cur = 0;
1946 qp->s_state = TID_OP(WRITE_REQ);
1947 } else if (!cmp_psn(psn, spsn)) {
1948 qp->s_cur = qpriv->s_tid_cur;
1949 qp->s_state = TID_OP(WRITE_RESP);
1950 }
1951}
1952
1953/*
1954 * do_rc_ack - process an incoming RC ACK
1955 * @qp: the QP the ACK came in on
1956 * @psn: the packet sequence number of the ACK
1957 * @opcode: the opcode of the request that resulted in the ACK
1958 *
1959 * This is called from rc_rcv_resp() to process an incoming RC ACK
1960 * for the given QP.
1961 * May be called at interrupt level, with the QP s_lock held.
1962 * Returns 1 if OK, 0 if current operation should be aborted (NAK).
1963 */
1964int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode,
1965 u64 val, struct hfi1_ctxtdata *rcd)
1966{
1967 struct hfi1_ibport *ibp;
1968 enum ib_wc_status status;
1969 struct hfi1_qp_priv *qpriv = qp->priv;
1970 struct rvt_swqe *wqe;
1971 int ret = 0;
1972 u32 ack_psn;
1973 int diff;
1974 struct rvt_dev_info *rdi;
1975
1976 lockdep_assert_held(&qp->s_lock);
1977 /*
1978 * Note that NAKs implicitly ACK outstanding SEND and RDMA write
1979 * requests and implicitly NAK RDMA read and atomic requests issued
1980 * before the NAK'ed request. The MSN won't include the NAK'ed
1981 * request but will include an ACK'ed request(s).
1982 */
1983 ack_psn = psn;
1984 if (aeth >> IB_AETH_NAK_SHIFT)
1985 ack_psn--;
1986 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
1987 ibp = rcd_to_iport(rcd);
1988
1989 /*
1990 * The MSN might be for a later WQE than the PSN indicates so
1991 * only complete WQEs that the PSN finishes.
1992 */
1993 while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) {
1994 /*
1995 * RDMA_READ_RESPONSE_ONLY is a special case since
1996 * we want to generate completion events for everything
1997 * before the RDMA read, copy the data, then generate
1998 * the completion for the read.
1999 */
2000 if (wqe->wr.opcode == IB_WR_RDMA_READ &&
2001 opcode == OP(RDMA_READ_RESPONSE_ONLY) &&
2002 diff == 0) {
2003 ret = 1;
2004 goto bail_stop;
2005 }
2006 /*
2007 * If this request is a RDMA read or atomic, and the ACK is
2008 * for a later operation, this ACK NAKs the RDMA read or
2009 * atomic. In other words, only a RDMA_READ_LAST or ONLY
2010 * can ACK a RDMA read and likewise for atomic ops. Note
2011 * that the NAK case can only happen if relaxed ordering is
2012 * used and requests are sent after an RDMA read or atomic
2013 * is sent but before the response is received.
2014 */
2015 if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
2016 (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) ||
2017 (wqe->wr.opcode == IB_WR_TID_RDMA_READ &&
2018 (opcode != TID_OP(READ_RESP) || diff != 0)) ||
2019 ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
2020 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
2021 (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0)) ||
2022 (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
2023 (delta_psn(psn, qp->s_last_psn) != 1))) {
2024 set_restart_qp(qp, rcd);
2025 /*
2026 * No need to process the ACK/NAK since we are
2027 * restarting an earlier request.
2028 */
2029 goto bail_stop;
2030 }
2031 if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
2032 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
2033 u64 *vaddr = wqe->sg_list[0].vaddr;
2034 *vaddr = val;
2035 }
2036 if (wqe->wr.opcode == IB_WR_OPFN)
2037 opfn_conn_reply(qp, val);
2038
2039 if (qp->s_num_rd_atomic &&
2040 (wqe->wr.opcode == IB_WR_RDMA_READ ||
2041 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
2042 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) {
2043 qp->s_num_rd_atomic--;
2044 /* Restart sending task if fence is complete */
2045 if ((qp->s_flags & RVT_S_WAIT_FENCE) &&
2046 !qp->s_num_rd_atomic) {
2047 qp->s_flags &= ~(RVT_S_WAIT_FENCE |
2048 RVT_S_WAIT_ACK);
2049 hfi1_schedule_send(qp);
2050 } else if (qp->s_flags & RVT_S_WAIT_RDMAR) {
2051 qp->s_flags &= ~(RVT_S_WAIT_RDMAR |
2052 RVT_S_WAIT_ACK);
2053 hfi1_schedule_send(qp);
2054 }
2055 }
2056
2057 /*
2058 * TID RDMA WRITE requests will be completed by the TID RDMA
2059 * ACK packet handler (see tid_rdma.c).
2060 */
2061 if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE)
2062 break;
2063
2064 wqe = do_rc_completion(qp, wqe, ibp);
2065 if (qp->s_acked == qp->s_tail)
2066 break;
2067 }
2068
2069 trace_hfi1_rc_ack_do(qp, aeth, psn, wqe);
2070 trace_hfi1_sender_do_rc_ack(qp);
2071 switch (aeth >> IB_AETH_NAK_SHIFT) {
2072 case 0: /* ACK */
2073 this_cpu_inc(*ibp->rvp.rc_acks);
2074 if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) {
2075 if (wqe_to_tid_req(wqe)->ack_pending)
2076 rvt_mod_retry_timer_ext(qp,
2077 qpriv->timeout_shift);
2078 else
2079 rvt_stop_rc_timers(qp);
2080 } else if (qp->s_acked != qp->s_tail) {
2081 struct rvt_swqe *__w = NULL;
2082
2083 if (qpriv->s_tid_cur != HFI1_QP_WQE_INVALID)
2084 __w = rvt_get_swqe_ptr(qp, qpriv->s_tid_cur);
2085
2086 /*
2087 * Stop timers if we've received all of the TID RDMA
2088 * WRITE * responses.
2089 */
2090 if (__w && __w->wr.opcode == IB_WR_TID_RDMA_WRITE &&
2091 opcode == TID_OP(WRITE_RESP)) {
2092 /*
2093 * Normally, the loop above would correctly
2094 * process all WQEs from s_acked onward and
2095 * either complete them or check for correct
2096 * PSN sequencing.
2097 * However, for TID RDMA, due to pipelining,
2098 * the response may not be for the request at
2099 * s_acked so the above look would just be
2100 * skipped. This does not allow for checking
2101 * the PSN sequencing. It has to be done
2102 * separately.
2103 */
2104 if (cmp_psn(psn, qp->s_last_psn + 1)) {
2105 set_restart_qp(qp, rcd);
2106 goto bail_stop;
2107 }
2108 /*
2109 * If the psn is being resent, stop the
2110 * resending.
2111 */
2112 if (qp->s_cur != qp->s_tail &&
2113 cmp_psn(qp->s_psn, psn) <= 0)
2114 update_qp_retry_state(qp, psn,
2115 __w->psn,
2116 __w->lpsn);
2117 else if (--qpriv->pending_tid_w_resp)
2118 rvt_mod_retry_timer(qp);
2119 else
2120 rvt_stop_rc_timers(qp);
2121 } else {
2122 /*
2123 * We are expecting more ACKs so
2124 * mod the retry timer.
2125 */
2126 rvt_mod_retry_timer(qp);
2127 /*
2128 * We can stop re-sending the earlier packets
2129 * and continue with the next packet the
2130 * receiver wants.
2131 */
2132 if (cmp_psn(qp->s_psn, psn) <= 0)
2133 reset_psn(qp, psn + 1);
2134 }
2135 } else {
2136 /* No more acks - kill all timers */
2137 rvt_stop_rc_timers(qp);
2138 if (cmp_psn(qp->s_psn, psn) <= 0) {
2139 qp->s_state = OP(SEND_LAST);
2140 qp->s_psn = psn + 1;
2141 }
2142 }
2143 if (qp->s_flags & RVT_S_WAIT_ACK) {
2144 qp->s_flags &= ~RVT_S_WAIT_ACK;
2145 hfi1_schedule_send(qp);
2146 }
2147 rvt_get_credit(qp, aeth);
2148 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
2149 qp->s_retry = qp->s_retry_cnt;
2150 /*
2151 * If the current request is a TID RDMA WRITE request and the
2152 * response is not a TID RDMA WRITE RESP packet, s_last_psn
2153 * can't be advanced.
2154 */
2155 if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
2156 opcode != TID_OP(WRITE_RESP) &&
2157 cmp_psn(psn, wqe->psn) >= 0)
2158 return 1;
2159 update_last_psn(qp, psn);
2160 return 1;
2161
2162 case 1: /* RNR NAK */
2163 ibp->rvp.n_rnr_naks++;
2164 if (qp->s_acked == qp->s_tail)
2165 goto bail_stop;
2166 if (qp->s_flags & RVT_S_WAIT_RNR)
2167 goto bail_stop;
2168 rdi = ib_to_rvt(qp->ibqp.device);
2169 if (!(rdi->post_parms[wqe->wr.opcode].flags &
2170 RVT_OPERATION_IGN_RNR_CNT)) {
2171 if (qp->s_rnr_retry == 0) {
2172 status = IB_WC_RNR_RETRY_EXC_ERR;
2173 goto class_b;
2174 }
2175 if (qp->s_rnr_retry_cnt < 7 && qp->s_rnr_retry_cnt > 0)
2176 qp->s_rnr_retry--;
2177 }
2178
2179 /*
2180 * The last valid PSN is the previous PSN. For TID RDMA WRITE
2181 * request, s_last_psn should be incremented only when a TID
2182 * RDMA WRITE RESP is received to avoid skipping lost TID RDMA
2183 * WRITE RESP packets.
2184 */
2185 if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) {
2186 reset_psn(qp, qp->s_last_psn + 1);
2187 } else {
2188 update_last_psn(qp, psn - 1);
2189 reset_psn(qp, psn);
2190 }
2191
2192 ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn);
2193 qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK);
2194 rvt_stop_rc_timers(qp);
2195 rvt_add_rnr_timer(qp, aeth);
2196 return 0;
2197
2198 case 3: /* NAK */
2199 if (qp->s_acked == qp->s_tail)
2200 goto bail_stop;
2201 /* The last valid PSN is the previous PSN. */
2202 update_last_psn(qp, psn - 1);
2203 switch ((aeth >> IB_AETH_CREDIT_SHIFT) &
2204 IB_AETH_CREDIT_MASK) {
2205 case 0: /* PSN sequence error */
2206 ibp->rvp.n_seq_naks++;
2207 /*
2208 * Back up to the responder's expected PSN.
2209 * Note that we might get a NAK in the middle of an
2210 * RDMA READ response which terminates the RDMA
2211 * READ.
2212 */
2213 hfi1_restart_rc(qp, psn, 0);
2214 hfi1_schedule_send(qp);
2215 break;
2216
2217 case 1: /* Invalid Request */
2218 status = IB_WC_REM_INV_REQ_ERR;
2219 ibp->rvp.n_other_naks++;
2220 goto class_b;
2221
2222 case 2: /* Remote Access Error */
2223 status = IB_WC_REM_ACCESS_ERR;
2224 ibp->rvp.n_other_naks++;
2225 goto class_b;
2226
2227 case 3: /* Remote Operation Error */
2228 status = IB_WC_REM_OP_ERR;
2229 ibp->rvp.n_other_naks++;
2230class_b:
2231 if (qp->s_last == qp->s_acked) {
2232 if (wqe->wr.opcode == IB_WR_TID_RDMA_READ)
2233 hfi1_kern_read_tid_flow_free(qp);
2234
2235 hfi1_trdma_send_complete(qp, wqe, status);
2236 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
2237 }
2238 break;
2239
2240 default:
2241 /* Ignore other reserved NAK error codes */
2242 goto reserved;
2243 }
2244 qp->s_retry = qp->s_retry_cnt;
2245 qp->s_rnr_retry = qp->s_rnr_retry_cnt;
2246 goto bail_stop;
2247
2248 default: /* 2: reserved */
2249reserved:
2250 /* Ignore reserved NAK codes. */
2251 goto bail_stop;
2252 }
2253 /* cannot be reached */
2254bail_stop:
2255 rvt_stop_rc_timers(qp);
2256 return ret;
2257}
2258
2259/*
2260 * We have seen an out of sequence RDMA read middle or last packet.
2261 * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE.
2262 */
2263static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn,
2264 struct hfi1_ctxtdata *rcd)
2265{
2266 struct rvt_swqe *wqe;
2267
2268 lockdep_assert_held(&qp->s_lock);
2269 /* Remove QP from retry timer */
2270 rvt_stop_rc_timers(qp);
2271
2272 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
2273
2274 while (cmp_psn(psn, wqe->lpsn) > 0) {
2275 if (wqe->wr.opcode == IB_WR_RDMA_READ ||
2276 wqe->wr.opcode == IB_WR_TID_RDMA_READ ||
2277 wqe->wr.opcode == IB_WR_TID_RDMA_WRITE ||
2278 wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
2279 wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
2280 break;
2281 wqe = do_rc_completion(qp, wqe, ibp);
2282 }
2283
2284 ibp->rvp.n_rdma_seq++;
2285 qp->r_flags |= RVT_R_RDMAR_SEQ;
2286 hfi1_restart_rc(qp, qp->s_last_psn + 1, 0);
2287 if (list_empty(&qp->rspwait)) {
2288 qp->r_flags |= RVT_R_RSP_SEND;
2289 rvt_get_qp(qp);
2290 list_add_tail(&qp->rspwait, &rcd->qp_wait_list);
2291 }
2292}
2293
2294/**
2295 * rc_rcv_resp - process an incoming RC response packet
2296 * @packet: data packet information
2297 *
2298 * This is called from hfi1_rc_rcv() to process an incoming RC response
2299 * packet for the given QP.
2300 * Called at interrupt level.
2301 */
2302static void rc_rcv_resp(struct hfi1_packet *packet)
2303{
2304 struct hfi1_ctxtdata *rcd = packet->rcd;
2305 void *data = packet->payload;
2306 u32 tlen = packet->tlen;
2307 struct rvt_qp *qp = packet->qp;
2308 struct hfi1_ibport *ibp;
2309 struct ib_other_headers *ohdr = packet->ohdr;
2310 struct rvt_swqe *wqe;
2311 enum ib_wc_status status;
2312 unsigned long flags;
2313 int diff;
2314 u64 val;
2315 u32 aeth;
2316 u32 psn = ib_bth_get_psn(packet->ohdr);
2317 u32 pmtu = qp->pmtu;
2318 u16 hdrsize = packet->hlen;
2319 u8 opcode = packet->opcode;
2320 u8 pad = packet->pad;
2321 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
2322
2323 spin_lock_irqsave(&qp->s_lock, flags);
2324 trace_hfi1_ack(qp, psn);
2325
2326 /* Ignore invalid responses. */
2327 if (cmp_psn(psn, READ_ONCE(qp->s_next_psn)) >= 0)
2328 goto ack_done;
2329
2330 /* Ignore duplicate responses. */
2331 diff = cmp_psn(psn, qp->s_last_psn);
2332 if (unlikely(diff <= 0)) {
2333 /* Update credits for "ghost" ACKs */
2334 if (diff == 0 && opcode == OP(ACKNOWLEDGE)) {
2335 aeth = be32_to_cpu(ohdr->u.aeth);
2336 if ((aeth >> IB_AETH_NAK_SHIFT) == 0)
2337 rvt_get_credit(qp, aeth);
2338 }
2339 goto ack_done;
2340 }
2341
2342 /*
2343 * Skip everything other than the PSN we expect, if we are waiting
2344 * for a reply to a restarted RDMA read or atomic op.
2345 */
2346 if (qp->r_flags & RVT_R_RDMAR_SEQ) {
2347 if (cmp_psn(psn, qp->s_last_psn + 1) != 0)
2348 goto ack_done;
2349 qp->r_flags &= ~RVT_R_RDMAR_SEQ;
2350 }
2351
2352 if (unlikely(qp->s_acked == qp->s_tail))
2353 goto ack_done;
2354 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
2355 status = IB_WC_SUCCESS;
2356
2357 switch (opcode) {
2358 case OP(ACKNOWLEDGE):
2359 case OP(ATOMIC_ACKNOWLEDGE):
2360 case OP(RDMA_READ_RESPONSE_FIRST):
2361 aeth = be32_to_cpu(ohdr->u.aeth);
2362 if (opcode == OP(ATOMIC_ACKNOWLEDGE))
2363 val = ib_u64_get(&ohdr->u.at.atomic_ack_eth);
2364 else
2365 val = 0;
2366 if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) ||
2367 opcode != OP(RDMA_READ_RESPONSE_FIRST))
2368 goto ack_done;
2369 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
2370 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
2371 goto ack_op_err;
2372 /*
2373 * If this is a response to a resent RDMA read, we
2374 * have to be careful to copy the data to the right
2375 * location.
2376 */
2377 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
2378 wqe, psn, pmtu);
2379 goto read_middle;
2380
2381 case OP(RDMA_READ_RESPONSE_MIDDLE):
2382 /* no AETH, no ACK */
2383 if (unlikely(cmp_psn(psn, qp->s_last_psn + 1)))
2384 goto ack_seq_err;
2385 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
2386 goto ack_op_err;
2387read_middle:
2388 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
2389 goto ack_len_err;
2390 if (unlikely(pmtu >= qp->s_rdma_read_len))
2391 goto ack_len_err;
2392
2393 /*
2394 * We got a response so update the timeout.
2395 * 4.096 usec. * (1 << qp->timeout)
2396 */
2397 rvt_mod_retry_timer(qp);
2398 if (qp->s_flags & RVT_S_WAIT_ACK) {
2399 qp->s_flags &= ~RVT_S_WAIT_ACK;
2400 hfi1_schedule_send(qp);
2401 }
2402
2403 if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE))
2404 qp->s_retry = qp->s_retry_cnt;
2405
2406 /*
2407 * Update the RDMA receive state but do the copy w/o
2408 * holding the locks and blocking interrupts.
2409 */
2410 qp->s_rdma_read_len -= pmtu;
2411 update_last_psn(qp, psn);
2412 spin_unlock_irqrestore(&qp->s_lock, flags);
2413 rvt_copy_sge(qp, &qp->s_rdma_read_sge,
2414 data, pmtu, false, false);
2415 goto bail;
2416
2417 case OP(RDMA_READ_RESPONSE_ONLY):
2418 aeth = be32_to_cpu(ohdr->u.aeth);
2419 if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd))
2420 goto ack_done;
2421 /*
2422 * Check that the data size is >= 0 && <= pmtu.
2423 * Remember to account for ICRC (4).
2424 */
2425 if (unlikely(tlen < (hdrsize + extra_bytes)))
2426 goto ack_len_err;
2427 /*
2428 * If this is a response to a resent RDMA read, we
2429 * have to be careful to copy the data to the right
2430 * location.
2431 */
2432 wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
2433 qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
2434 wqe, psn, pmtu);
2435 goto read_last;
2436
2437 case OP(RDMA_READ_RESPONSE_LAST):
2438 /* ACKs READ req. */
2439 if (unlikely(cmp_psn(psn, qp->s_last_psn + 1)))
2440 goto ack_seq_err;
2441 if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
2442 goto ack_op_err;
2443 /*
2444 * Check that the data size is >= 1 && <= pmtu.
2445 * Remember to account for ICRC (4).
2446 */
2447 if (unlikely(tlen <= (hdrsize + extra_bytes)))
2448 goto ack_len_err;
2449read_last:
2450 tlen -= hdrsize + extra_bytes;
2451 if (unlikely(tlen != qp->s_rdma_read_len))
2452 goto ack_len_err;
2453 aeth = be32_to_cpu(ohdr->u.aeth);
2454 rvt_copy_sge(qp, &qp->s_rdma_read_sge,
2455 data, tlen, false, false);
2456 WARN_ON(qp->s_rdma_read_sge.num_sge);
2457 (void)do_rc_ack(qp, aeth, psn,
2458 OP(RDMA_READ_RESPONSE_LAST), 0, rcd);
2459 goto ack_done;
2460 }
2461
2462ack_op_err:
2463 status = IB_WC_LOC_QP_OP_ERR;
2464 goto ack_err;
2465
2466ack_seq_err:
2467 ibp = rcd_to_iport(rcd);
2468 rdma_seq_err(qp, ibp, psn, rcd);
2469 goto ack_done;
2470
2471ack_len_err:
2472 status = IB_WC_LOC_LEN_ERR;
2473ack_err:
2474 if (qp->s_last == qp->s_acked) {
2475 rvt_send_complete(qp, wqe, status);
2476 rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
2477 }
2478ack_done:
2479 spin_unlock_irqrestore(&qp->s_lock, flags);
2480bail:
2481 return;
2482}
2483
2484static inline void rc_cancel_ack(struct rvt_qp *qp)
2485{
2486 qp->r_adefered = 0;
2487 if (list_empty(&qp->rspwait))
2488 return;
2489 list_del_init(&qp->rspwait);
2490 qp->r_flags &= ~RVT_R_RSP_NAK;
2491 rvt_put_qp(qp);
2492}
2493
2494/**
2495 * rc_rcv_error - process an incoming duplicate or error RC packet
2496 * @ohdr: the other headers for this packet
2497 * @data: the packet data
2498 * @qp: the QP for this packet
2499 * @opcode: the opcode for this packet
2500 * @psn: the packet sequence number for this packet
2501 * @diff: the difference between the PSN and the expected PSN
2502 * @rcd: the receive context
2503 *
2504 * This is called from hfi1_rc_rcv() to process an unexpected
2505 * incoming RC packet for the given QP.
2506 * Called at interrupt level.
2507 * Return 1 if no more processing is needed; otherwise return 0 to
2508 * schedule a response to be sent.
2509 */
2510static noinline int rc_rcv_error(struct ib_other_headers *ohdr, void *data,
2511 struct rvt_qp *qp, u32 opcode, u32 psn,
2512 int diff, struct hfi1_ctxtdata *rcd)
2513{
2514 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
2515 struct rvt_ack_entry *e;
2516 unsigned long flags;
2517 u8 prev;
2518 u8 mra; /* most recent ACK */
2519 bool old_req;
2520
2521 trace_hfi1_rcv_error(qp, psn);
2522 if (diff > 0) {
2523 /*
2524 * Packet sequence error.
2525 * A NAK will ACK earlier sends and RDMA writes.
2526 * Don't queue the NAK if we already sent one.
2527 */
2528 if (!qp->r_nak_state) {
2529 ibp->rvp.n_rc_seqnak++;
2530 qp->r_nak_state = IB_NAK_PSN_ERROR;
2531 /* Use the expected PSN. */
2532 qp->r_ack_psn = qp->r_psn;
2533 /*
2534 * Wait to send the sequence NAK until all packets
2535 * in the receive queue have been processed.
2536 * Otherwise, we end up propagating congestion.
2537 */
2538 rc_defered_ack(rcd, qp);
2539 }
2540 goto done;
2541 }
2542
2543 /*
2544 * Handle a duplicate request. Don't re-execute SEND, RDMA
2545 * write or atomic op. Don't NAK errors, just silently drop
2546 * the duplicate request. Note that r_sge, r_len, and
2547 * r_rcv_len may be in use so don't modify them.
2548 *
2549 * We are supposed to ACK the earliest duplicate PSN but we
2550 * can coalesce an outstanding duplicate ACK. We have to
2551 * send the earliest so that RDMA reads can be restarted at
2552 * the requester's expected PSN.
2553 *
2554 * First, find where this duplicate PSN falls within the
2555 * ACKs previously sent.
2556 * old_req is true if there is an older response that is scheduled
2557 * to be sent before sending this one.
2558 */
2559 e = NULL;
2560 old_req = true;
2561 ibp->rvp.n_rc_dupreq++;
2562
2563 spin_lock_irqsave(&qp->s_lock, flags);
2564
2565 e = find_prev_entry(qp, psn, &prev, &mra, &old_req);
2566
2567 switch (opcode) {
2568 case OP(RDMA_READ_REQUEST): {
2569 struct ib_reth *reth;
2570 u32 offset;
2571 u32 len;
2572
2573 /*
2574 * If we didn't find the RDMA read request in the ack queue,
2575 * we can ignore this request.
2576 */
2577 if (!e || e->opcode != OP(RDMA_READ_REQUEST))
2578 goto unlock_done;
2579 /* RETH comes after BTH */
2580 reth = &ohdr->u.rc.reth;
2581 /*
2582 * Address range must be a subset of the original
2583 * request and start on pmtu boundaries.
2584 * We reuse the old ack_queue slot since the requester
2585 * should not back up and request an earlier PSN for the
2586 * same request.
2587 */
2588 offset = delta_psn(psn, e->psn) * qp->pmtu;
2589 len = be32_to_cpu(reth->length);
2590 if (unlikely(offset + len != e->rdma_sge.sge_length))
2591 goto unlock_done;
2592 release_rdma_sge_mr(e);
2593 if (len != 0) {
2594 u32 rkey = be32_to_cpu(reth->rkey);
2595 u64 vaddr = get_ib_reth_vaddr(reth);
2596 int ok;
2597
2598 ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey,
2599 IB_ACCESS_REMOTE_READ);
2600 if (unlikely(!ok))
2601 goto unlock_done;
2602 } else {
2603 e->rdma_sge.vaddr = NULL;
2604 e->rdma_sge.length = 0;
2605 e->rdma_sge.sge_length = 0;
2606 }
2607 e->psn = psn;
2608 if (old_req)
2609 goto unlock_done;
2610 if (qp->s_acked_ack_queue == qp->s_tail_ack_queue)
2611 qp->s_acked_ack_queue = prev;
2612 qp->s_tail_ack_queue = prev;
2613 break;
2614 }
2615
2616 case OP(COMPARE_SWAP):
2617 case OP(FETCH_ADD): {
2618 /*
2619 * If we didn't find the atomic request in the ack queue
2620 * or the send engine is already backed up to send an
2621 * earlier entry, we can ignore this request.
2622 */
2623 if (!e || e->opcode != (u8)opcode || old_req)
2624 goto unlock_done;
2625 if (qp->s_tail_ack_queue == qp->s_acked_ack_queue)
2626 qp->s_acked_ack_queue = prev;
2627 qp->s_tail_ack_queue = prev;
2628 break;
2629 }
2630
2631 default:
2632 /*
2633 * Ignore this operation if it doesn't request an ACK
2634 * or an earlier RDMA read or atomic is going to be resent.
2635 */
2636 if (!(psn & IB_BTH_REQ_ACK) || old_req)
2637 goto unlock_done;
2638 /*
2639 * Resend the most recent ACK if this request is
2640 * after all the previous RDMA reads and atomics.
2641 */
2642 if (mra == qp->r_head_ack_queue) {
2643 spin_unlock_irqrestore(&qp->s_lock, flags);
2644 qp->r_nak_state = 0;
2645 qp->r_ack_psn = qp->r_psn - 1;
2646 goto send_ack;
2647 }
2648
2649 /*
2650 * Resend the RDMA read or atomic op which
2651 * ACKs this duplicate request.
2652 */
2653 if (qp->s_tail_ack_queue == qp->s_acked_ack_queue)
2654 qp->s_acked_ack_queue = mra;
2655 qp->s_tail_ack_queue = mra;
2656 break;
2657 }
2658 qp->s_ack_state = OP(ACKNOWLEDGE);
2659 qp->s_flags |= RVT_S_RESP_PENDING;
2660 qp->r_nak_state = 0;
2661 hfi1_schedule_send(qp);
2662
2663unlock_done:
2664 spin_unlock_irqrestore(&qp->s_lock, flags);
2665done:
2666 return 1;
2667
2668send_ack:
2669 return 0;
2670}
2671
2672static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid,
2673 u32 lqpn, u32 rqpn, u8 svc_type)
2674{
2675 struct opa_hfi1_cong_log_event_internal *cc_event;
2676 unsigned long flags;
2677
2678 if (sl >= OPA_MAX_SLS)
2679 return;
2680
2681 spin_lock_irqsave(&ppd->cc_log_lock, flags);
2682
2683 ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8);
2684 ppd->threshold_event_counter++;
2685
2686 cc_event = &ppd->cc_events[ppd->cc_log_idx++];
2687 if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS)
2688 ppd->cc_log_idx = 0;
2689 cc_event->lqpn = lqpn & RVT_QPN_MASK;
2690 cc_event->rqpn = rqpn & RVT_QPN_MASK;
2691 cc_event->sl = sl;
2692 cc_event->svc_type = svc_type;
2693 cc_event->rlid = rlid;
2694 /* keep timestamp in units of 1.024 usec */
2695 cc_event->timestamp = ktime_get_ns() / 1024;
2696
2697 spin_unlock_irqrestore(&ppd->cc_log_lock, flags);
2698}
2699
2700void process_becn(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, u32 lqpn,
2701 u32 rqpn, u8 svc_type)
2702{
2703 struct cca_timer *cca_timer;
2704 u16 ccti, ccti_incr, ccti_timer, ccti_limit;
2705 u8 trigger_threshold;
2706 struct cc_state *cc_state;
2707 unsigned long flags;
2708
2709 if (sl >= OPA_MAX_SLS)
2710 return;
2711
2712 cc_state = get_cc_state(ppd);
2713
2714 if (!cc_state)
2715 return;
2716
2717 /*
2718 * 1) increase CCTI (for this SL)
2719 * 2) select IPG (i.e., call set_link_ipg())
2720 * 3) start timer
2721 */
2722 ccti_limit = cc_state->cct.ccti_limit;
2723 ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase;
2724 ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer;
2725 trigger_threshold =
2726 cc_state->cong_setting.entries[sl].trigger_threshold;
2727
2728 spin_lock_irqsave(&ppd->cca_timer_lock, flags);
2729
2730 cca_timer = &ppd->cca_timer[sl];
2731 if (cca_timer->ccti < ccti_limit) {
2732 if (cca_timer->ccti + ccti_incr <= ccti_limit)
2733 cca_timer->ccti += ccti_incr;
2734 else
2735 cca_timer->ccti = ccti_limit;
2736 set_link_ipg(ppd);
2737 }
2738
2739 ccti = cca_timer->ccti;
2740
2741 if (!hrtimer_active(&cca_timer->hrtimer)) {
2742 /* ccti_timer is in units of 1.024 usec */
2743 unsigned long nsec = 1024 * ccti_timer;
2744
2745 hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec),
2746 HRTIMER_MODE_REL_PINNED);
2747 }
2748
2749 spin_unlock_irqrestore(&ppd->cca_timer_lock, flags);
2750
2751 if ((trigger_threshold != 0) && (ccti >= trigger_threshold))
2752 log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type);
2753}
2754
2755/**
2756 * hfi1_rc_rcv - process an incoming RC packet
2757 * @packet: data packet information
2758 *
2759 * This is called from qp_rcv() to process an incoming RC packet
2760 * for the given QP.
2761 * May be called at interrupt level.
2762 */
2763void hfi1_rc_rcv(struct hfi1_packet *packet)
2764{
2765 struct hfi1_ctxtdata *rcd = packet->rcd;
2766 void *data = packet->payload;
2767 u32 tlen = packet->tlen;
2768 struct rvt_qp *qp = packet->qp;
2769 struct hfi1_qp_priv *qpriv = qp->priv;
2770 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
2771 struct ib_other_headers *ohdr = packet->ohdr;
2772 u32 opcode = packet->opcode;
2773 u32 hdrsize = packet->hlen;
2774 u32 psn = ib_bth_get_psn(packet->ohdr);
2775 u32 pad = packet->pad;
2776 struct ib_wc wc;
2777 u32 pmtu = qp->pmtu;
2778 int diff;
2779 struct ib_reth *reth;
2780 unsigned long flags;
2781 int ret;
2782 bool copy_last = false, fecn;
2783 u32 rkey;
2784 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
2785
2786 lockdep_assert_held(&qp->r_lock);
2787
2788 if (hfi1_ruc_check_hdr(ibp, packet))
2789 return;
2790
2791 fecn = process_ecn(qp, packet);
2792 opfn_trigger_conn_request(qp, be32_to_cpu(ohdr->bth[1]));
2793
2794 /*
2795 * Process responses (ACKs) before anything else. Note that the
2796 * packet sequence number will be for something in the send work
2797 * queue rather than the expected receive packet sequence number.
2798 * In other words, this QP is the requester.
2799 */
2800 if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) &&
2801 opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
2802 rc_rcv_resp(packet);
2803 return;
2804 }
2805
2806 /* Compute 24 bits worth of difference. */
2807 diff = delta_psn(psn, qp->r_psn);
2808 if (unlikely(diff)) {
2809 if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd))
2810 return;
2811 goto send_ack;
2812 }
2813
2814 /* Check for opcode sequence errors. */
2815 switch (qp->r_state) {
2816 case OP(SEND_FIRST):
2817 case OP(SEND_MIDDLE):
2818 if (opcode == OP(SEND_MIDDLE) ||
2819 opcode == OP(SEND_LAST) ||
2820 opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
2821 opcode == OP(SEND_LAST_WITH_INVALIDATE))
2822 break;
2823 goto nack_inv;
2824
2825 case OP(RDMA_WRITE_FIRST):
2826 case OP(RDMA_WRITE_MIDDLE):
2827 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
2828 opcode == OP(RDMA_WRITE_LAST) ||
2829 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
2830 break;
2831 goto nack_inv;
2832
2833 default:
2834 if (opcode == OP(SEND_MIDDLE) ||
2835 opcode == OP(SEND_LAST) ||
2836 opcode == OP(SEND_LAST_WITH_IMMEDIATE) ||
2837 opcode == OP(SEND_LAST_WITH_INVALIDATE) ||
2838 opcode == OP(RDMA_WRITE_MIDDLE) ||
2839 opcode == OP(RDMA_WRITE_LAST) ||
2840 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
2841 goto nack_inv;
2842 /*
2843 * Note that it is up to the requester to not send a new
2844 * RDMA read or atomic operation before receiving an ACK
2845 * for the previous operation.
2846 */
2847 break;
2848 }
2849
2850 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
2851 rvt_comm_est(qp);
2852
2853 /* OK, process the packet. */
2854 switch (opcode) {
2855 case OP(SEND_FIRST):
2856 ret = rvt_get_rwqe(qp, false);
2857 if (ret < 0)
2858 goto nack_op_err;
2859 if (!ret)
2860 goto rnr_nak;
2861 qp->r_rcv_len = 0;
2862 fallthrough;
2863 case OP(SEND_MIDDLE):
2864 case OP(RDMA_WRITE_MIDDLE):
2865send_middle:
2866 /* Check for invalid length PMTU or posted rwqe len. */
2867 /*
2868 * There will be no padding for 9B packet but 16B packets
2869 * will come in with some padding since we always add
2870 * CRC and LT bytes which will need to be flit aligned
2871 */
2872 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
2873 goto nack_inv;
2874 qp->r_rcv_len += pmtu;
2875 if (unlikely(qp->r_rcv_len > qp->r_len))
2876 goto nack_inv;
2877 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
2878 break;
2879
2880 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
2881 /* consume RWQE */
2882 ret = rvt_get_rwqe(qp, true);
2883 if (ret < 0)
2884 goto nack_op_err;
2885 if (!ret)
2886 goto rnr_nak;
2887 goto send_last_imm;
2888
2889 case OP(SEND_ONLY):
2890 case OP(SEND_ONLY_WITH_IMMEDIATE):
2891 case OP(SEND_ONLY_WITH_INVALIDATE):
2892 ret = rvt_get_rwqe(qp, false);
2893 if (ret < 0)
2894 goto nack_op_err;
2895 if (!ret)
2896 goto rnr_nak;
2897 qp->r_rcv_len = 0;
2898 if (opcode == OP(SEND_ONLY))
2899 goto no_immediate_data;
2900 if (opcode == OP(SEND_ONLY_WITH_INVALIDATE))
2901 goto send_last_inv;
2902 fallthrough; /* for SEND_ONLY_WITH_IMMEDIATE */
2903 case OP(SEND_LAST_WITH_IMMEDIATE):
2904send_last_imm:
2905 wc.ex.imm_data = ohdr->u.imm_data;
2906 wc.wc_flags = IB_WC_WITH_IMM;
2907 goto send_last;
2908 case OP(SEND_LAST_WITH_INVALIDATE):
2909send_last_inv:
2910 rkey = be32_to_cpu(ohdr->u.ieth);
2911 if (rvt_invalidate_rkey(qp, rkey))
2912 goto no_immediate_data;
2913 wc.ex.invalidate_rkey = rkey;
2914 wc.wc_flags = IB_WC_WITH_INVALIDATE;
2915 goto send_last;
2916 case OP(RDMA_WRITE_LAST):
2917 copy_last = rvt_is_user_qp(qp);
2918 fallthrough;
2919 case OP(SEND_LAST):
2920no_immediate_data:
2921 wc.wc_flags = 0;
2922 wc.ex.imm_data = 0;
2923send_last:
2924 /* Check for invalid length. */
2925 /* LAST len should be >= 1 */
2926 if (unlikely(tlen < (hdrsize + extra_bytes)))
2927 goto nack_inv;
2928 /* Don't count the CRC(and padding and LT byte for 16B). */
2929 tlen -= (hdrsize + extra_bytes);
2930 wc.byte_len = tlen + qp->r_rcv_len;
2931 if (unlikely(wc.byte_len > qp->r_len))
2932 goto nack_inv;
2933 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, copy_last);
2934 rvt_put_ss(&qp->r_sge);
2935 qp->r_msn++;
2936 if (!__test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
2937 break;
2938 wc.wr_id = qp->r_wr_id;
2939 wc.status = IB_WC_SUCCESS;
2940 if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) ||
2941 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
2942 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
2943 else
2944 wc.opcode = IB_WC_RECV;
2945 wc.qp = &qp->ibqp;
2946 wc.src_qp = qp->remote_qpn;
2947 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
2948 /*
2949 * It seems that IB mandates the presence of an SL in a
2950 * work completion only for the UD transport (see section
2951 * 11.4.2 of IBTA Vol. 1).
2952 *
2953 * However, the way the SL is chosen below is consistent
2954 * with the way that IB/qib works and is trying avoid
2955 * introducing incompatibilities.
2956 *
2957 * See also OPA Vol. 1, section 9.7.6, and table 9-17.
2958 */
2959 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
2960 /* zero fields that are N/A */
2961 wc.vendor_err = 0;
2962 wc.pkey_index = 0;
2963 wc.dlid_path_bits = 0;
2964 wc.port_num = 0;
2965 /* Signal completion event if the solicited bit is set. */
2966 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
2967 break;
2968
2969 case OP(RDMA_WRITE_ONLY):
2970 copy_last = rvt_is_user_qp(qp);
2971 fallthrough;
2972 case OP(RDMA_WRITE_FIRST):
2973 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
2974 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
2975 goto nack_inv;
2976 /* consume RWQE */
2977 reth = &ohdr->u.rc.reth;
2978 qp->r_len = be32_to_cpu(reth->length);
2979 qp->r_rcv_len = 0;
2980 qp->r_sge.sg_list = NULL;
2981 if (qp->r_len != 0) {
2982 u32 rkey = be32_to_cpu(reth->rkey);
2983 u64 vaddr = get_ib_reth_vaddr(reth);
2984 int ok;
2985
2986 /* Check rkey & NAK */
2987 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr,
2988 rkey, IB_ACCESS_REMOTE_WRITE);
2989 if (unlikely(!ok))
2990 goto nack_acc;
2991 qp->r_sge.num_sge = 1;
2992 } else {
2993 qp->r_sge.num_sge = 0;
2994 qp->r_sge.sge.mr = NULL;
2995 qp->r_sge.sge.vaddr = NULL;
2996 qp->r_sge.sge.length = 0;
2997 qp->r_sge.sge.sge_length = 0;
2998 }
2999 if (opcode == OP(RDMA_WRITE_FIRST))
3000 goto send_middle;
3001 else if (opcode == OP(RDMA_WRITE_ONLY))
3002 goto no_immediate_data;
3003 ret = rvt_get_rwqe(qp, true);
3004 if (ret < 0)
3005 goto nack_op_err;
3006 if (!ret) {
3007 /* peer will send again */
3008 rvt_put_ss(&qp->r_sge);
3009 goto rnr_nak;
3010 }
3011 wc.ex.imm_data = ohdr->u.rc.imm_data;
3012 wc.wc_flags = IB_WC_WITH_IMM;
3013 goto send_last;
3014
3015 case OP(RDMA_READ_REQUEST): {
3016 struct rvt_ack_entry *e;
3017 u32 len;
3018 u8 next;
3019
3020 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
3021 goto nack_inv;
3022 next = qp->r_head_ack_queue + 1;
3023 /* s_ack_queue is size rvt_size_atomic()+1 so use > not >= */
3024 if (next > rvt_size_atomic(ib_to_rvt(qp->ibqp.device)))
3025 next = 0;
3026 spin_lock_irqsave(&qp->s_lock, flags);
3027 if (unlikely(next == qp->s_acked_ack_queue)) {
3028 if (!qp->s_ack_queue[next].sent)
3029 goto nack_inv_unlck;
3030 update_ack_queue(qp, next);
3031 }
3032 e = &qp->s_ack_queue[qp->r_head_ack_queue];
3033 release_rdma_sge_mr(e);
3034 reth = &ohdr->u.rc.reth;
3035 len = be32_to_cpu(reth->length);
3036 if (len) {
3037 u32 rkey = be32_to_cpu(reth->rkey);
3038 u64 vaddr = get_ib_reth_vaddr(reth);
3039 int ok;
3040
3041 /* Check rkey & NAK */
3042 ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr,
3043 rkey, IB_ACCESS_REMOTE_READ);
3044 if (unlikely(!ok))
3045 goto nack_acc_unlck;
3046 /*
3047 * Update the next expected PSN. We add 1 later
3048 * below, so only add the remainder here.
3049 */
3050 qp->r_psn += rvt_div_mtu(qp, len - 1);
3051 } else {
3052 e->rdma_sge.mr = NULL;
3053 e->rdma_sge.vaddr = NULL;
3054 e->rdma_sge.length = 0;
3055 e->rdma_sge.sge_length = 0;
3056 }
3057 e->opcode = opcode;
3058 e->sent = 0;
3059 e->psn = psn;
3060 e->lpsn = qp->r_psn;
3061 /*
3062 * We need to increment the MSN here instead of when we
3063 * finish sending the result since a duplicate request would
3064 * increment it more than once.
3065 */
3066 qp->r_msn++;
3067 qp->r_psn++;
3068 qp->r_state = opcode;
3069 qp->r_nak_state = 0;
3070 qp->r_head_ack_queue = next;
3071 qpriv->r_tid_alloc = qp->r_head_ack_queue;
3072
3073 /* Schedule the send engine. */
3074 qp->s_flags |= RVT_S_RESP_PENDING;
3075 if (fecn)
3076 qp->s_flags |= RVT_S_ECN;
3077 hfi1_schedule_send(qp);
3078
3079 spin_unlock_irqrestore(&qp->s_lock, flags);
3080 return;
3081 }
3082
3083 case OP(COMPARE_SWAP):
3084 case OP(FETCH_ADD): {
3085 struct ib_atomic_eth *ateth = &ohdr->u.atomic_eth;
3086 u64 vaddr = get_ib_ateth_vaddr(ateth);
3087 bool opfn = opcode == OP(COMPARE_SWAP) &&
3088 vaddr == HFI1_VERBS_E_ATOMIC_VADDR;
3089 struct rvt_ack_entry *e;
3090 atomic64_t *maddr;
3091 u64 sdata;
3092 u32 rkey;
3093 u8 next;
3094
3095 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
3096 !opfn))
3097 goto nack_inv;
3098 next = qp->r_head_ack_queue + 1;
3099 if (next > rvt_size_atomic(ib_to_rvt(qp->ibqp.device)))
3100 next = 0;
3101 spin_lock_irqsave(&qp->s_lock, flags);
3102 if (unlikely(next == qp->s_acked_ack_queue)) {
3103 if (!qp->s_ack_queue[next].sent)
3104 goto nack_inv_unlck;
3105 update_ack_queue(qp, next);
3106 }
3107 e = &qp->s_ack_queue[qp->r_head_ack_queue];
3108 release_rdma_sge_mr(e);
3109 /* Process OPFN special virtual address */
3110 if (opfn) {
3111 opfn_conn_response(qp, e, ateth);
3112 goto ack;
3113 }
3114 if (unlikely(vaddr & (sizeof(u64) - 1)))
3115 goto nack_inv_unlck;
3116 rkey = be32_to_cpu(ateth->rkey);
3117 /* Check rkey & NAK */
3118 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
3119 vaddr, rkey,
3120 IB_ACCESS_REMOTE_ATOMIC)))
3121 goto nack_acc_unlck;
3122 /* Perform atomic OP and save result. */
3123 maddr = (atomic64_t *)qp->r_sge.sge.vaddr;
3124 sdata = get_ib_ateth_swap(ateth);
3125 e->atomic_data = (opcode == OP(FETCH_ADD)) ?
3126 (u64)atomic64_add_return(sdata, maddr) - sdata :
3127 (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr,
3128 get_ib_ateth_compare(ateth),
3129 sdata);
3130 rvt_put_mr(qp->r_sge.sge.mr);
3131 qp->r_sge.num_sge = 0;
3132ack:
3133 e->opcode = opcode;
3134 e->sent = 0;
3135 e->psn = psn;
3136 e->lpsn = psn;
3137 qp->r_msn++;
3138 qp->r_psn++;
3139 qp->r_state = opcode;
3140 qp->r_nak_state = 0;
3141 qp->r_head_ack_queue = next;
3142 qpriv->r_tid_alloc = qp->r_head_ack_queue;
3143
3144 /* Schedule the send engine. */
3145 qp->s_flags |= RVT_S_RESP_PENDING;
3146 if (fecn)
3147 qp->s_flags |= RVT_S_ECN;
3148 hfi1_schedule_send(qp);
3149
3150 spin_unlock_irqrestore(&qp->s_lock, flags);
3151 return;
3152 }
3153
3154 default:
3155 /* NAK unknown opcodes. */
3156 goto nack_inv;
3157 }
3158 qp->r_psn++;
3159 qp->r_state = opcode;
3160 qp->r_ack_psn = psn;
3161 qp->r_nak_state = 0;
3162 /* Send an ACK if requested or required. */
3163 if (psn & IB_BTH_REQ_ACK || fecn) {
3164 if (packet->numpkt == 0 || fecn ||
3165 qp->r_adefered >= HFI1_PSN_CREDIT) {
3166 rc_cancel_ack(qp);
3167 goto send_ack;
3168 }
3169 qp->r_adefered++;
3170 rc_defered_ack(rcd, qp);
3171 }
3172 return;
3173
3174rnr_nak:
3175 qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK;
3176 qp->r_ack_psn = qp->r_psn;
3177 /* Queue RNR NAK for later */
3178 rc_defered_ack(rcd, qp);
3179 return;
3180
3181nack_op_err:
3182 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
3183 qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR;
3184 qp->r_ack_psn = qp->r_psn;
3185 /* Queue NAK for later */
3186 rc_defered_ack(rcd, qp);
3187 return;
3188
3189nack_inv_unlck:
3190 spin_unlock_irqrestore(&qp->s_lock, flags);
3191nack_inv:
3192 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
3193 qp->r_nak_state = IB_NAK_INVALID_REQUEST;
3194 qp->r_ack_psn = qp->r_psn;
3195 /* Queue NAK for later */
3196 rc_defered_ack(rcd, qp);
3197 return;
3198
3199nack_acc_unlck:
3200 spin_unlock_irqrestore(&qp->s_lock, flags);
3201nack_acc:
3202 rvt_rc_error(qp, IB_WC_LOC_PROT_ERR);
3203 qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
3204 qp->r_ack_psn = qp->r_psn;
3205send_ack:
3206 hfi1_send_rc_ack(packet, fecn);
3207}
3208
3209void hfi1_rc_hdrerr(
3210 struct hfi1_ctxtdata *rcd,
3211 struct hfi1_packet *packet,
3212 struct rvt_qp *qp)
3213{
3214 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
3215 int diff;
3216 u32 opcode;
3217 u32 psn;
3218
3219 if (hfi1_ruc_check_hdr(ibp, packet))
3220 return;
3221
3222 psn = ib_bth_get_psn(packet->ohdr);
3223 opcode = ib_bth_get_opcode(packet->ohdr);
3224
3225 /* Only deal with RDMA Writes for now */
3226 if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) {
3227 diff = delta_psn(psn, qp->r_psn);
3228 if (!qp->r_nak_state && diff >= 0) {
3229 ibp->rvp.n_rc_seqnak++;
3230 qp->r_nak_state = IB_NAK_PSN_ERROR;
3231 /* Use the expected PSN. */
3232 qp->r_ack_psn = qp->r_psn;
3233 /*
3234 * Wait to send the sequence
3235 * NAK until all packets
3236 * in the receive queue have
3237 * been processed.
3238 * Otherwise, we end up
3239 * propagating congestion.
3240 */
3241 rc_defered_ack(rcd, qp);
3242 } /* Out of sequence NAK */
3243 } /* QP Request NAKs */
3244}
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
60static 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 */
85static 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:
206normal:
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
235bail:
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 */
256int 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 }
447no_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
701done_free_tx:
702 hfi1_put_txreq(ps->s_txreq);
703 ps->s_txreq = NULL;
704 return 1;
705
706bail:
707 hfi1_put_txreq(ps->s_txreq);
708
709bail_no_tx:
710 ps->s_txreq = NULL;
711 qp->s_flags &= ~RVT_S_BUSY;
712 return 0;
713}
714
715static 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
731static 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);
750unlock:
751 spin_unlock_irqrestore(&qp->s_lock, flags);
752}
753
754static 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
802static 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
855typedef 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 */
862static 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 */
875void 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 */
947static 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 }
1017done:
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 */
1034void 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 */
1074static 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 */
1100void 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
1187static 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 */
1197static 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 */
1281static 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++;
1469class_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 */
1485reserved:
1486 /* Ignore reserved NAK codes. */
1487 goto bail_stop;
1488 }
1489 /* cannot be reached */
1490bail_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 */
1499static 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 */
1536static 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;
1621read_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;
1682read_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
1694ack_op_err:
1695 status = IB_WC_LOC_QP_OP_ERR;
1696 goto ack_err;
1697
1698ack_seq_err:
1699 ibp = rcd_to_iport(rcd);
1700 rdma_seq_err(qp, ibp, psn, rcd);
1701 goto ack_done;
1702
1703ack_len_err:
1704 status = IB_WC_LOC_LEN_ERR;
1705ack_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 }
1710ack_done:
1711 spin_unlock_irqrestore(&qp->s_lock, flags);
1712bail:
1713 return;
1714}
1715
1716static 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
1726static 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 */
1751static 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
1921unlock_done:
1922 spin_unlock_irqrestore(&qp->s_lock, flags);
1923done:
1924 return 1;
1925
1926send_ack:
1927 return 0;
1928}
1929
1930static 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
1941static 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
1969void 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 */
2032void 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):
2135send_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):
2174send_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):
2179send_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):
2190no_immediate_data:
2191 wc.wc_flags = 0;
2192 wc.ex.imm_data = 0;
2193send_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
2449rnr_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
2456nack_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
2464nack_inv_unlck:
2465 spin_unlock_irqrestore(&qp->s_lock, flags);
2466nack_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
2474nack_acc_unlck:
2475 spin_unlock_irqrestore(&qp->s_lock, flags);
2476nack_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;
2480send_ack:
2481 hfi1_send_rc_ack(packet, is_fecn);
2482}
2483
2484void 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}