1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2 /*
3 * Copyright(c) 2015 - 2018 Intel Corporation.
4 */
5
6 #include "hfi.h"
7 #include "verbs_txreq.h"
8 #include "qp.h"
9
10 /* cut down ridiculously long IB macro names */
11 #define OP(x) UC_OP(x)
12
13 /**
14 * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
15 * @qp: a pointer to the QP
16 * @ps: the current packet state
17 *
18 * Assume s_lock is held.
19 *
20 * Return 1 if constructed; otherwise, return 0.
21 */
hfi1_make_uc_req(struct rvt_qp * qp,struct hfi1_pkt_state * ps)22 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
23 {
24 struct hfi1_qp_priv *priv = qp->priv;
25 struct ib_other_headers *ohdr;
26 struct rvt_swqe *wqe;
27 u32 hwords;
28 u32 bth0 = 0;
29 u32 len;
30 u32 pmtu = qp->pmtu;
31 int middle = 0;
32
33 ps->s_txreq = get_txreq(ps->dev, qp);
34 if (!ps->s_txreq)
35 goto bail_no_tx;
36
37 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
38 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
39 goto bail;
40 /* We are in the error state, flush the work request. */
41 if (qp->s_last == READ_ONCE(qp->s_head))
42 goto bail;
43 /* If DMAs are in progress, we can't flush immediately. */
44 if (iowait_sdma_pending(&priv->s_iowait)) {
45 qp->s_flags |= RVT_S_WAIT_DMA;
46 goto bail;
47 }
48 clear_ahg(qp);
49 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
50 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
51 goto done_free_tx;
52 }
53
54 if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
55 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
56 hwords = 5;
57 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
58 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
59 else
60 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
61 } else {
62 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
63 hwords = 7;
64 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
65 (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
66 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
67 else
68 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
69 }
70
71 /* Get the next send request. */
72 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
73 qp->s_wqe = NULL;
74 switch (qp->s_state) {
75 default:
76 if (!(ib_rvt_state_ops[qp->state] &
77 RVT_PROCESS_NEXT_SEND_OK))
78 goto bail;
79 /* Check if send work queue is empty. */
80 if (qp->s_cur == READ_ONCE(qp->s_head)) {
81 clear_ahg(qp);
82 goto bail;
83 }
84 /*
85 * Local operations are processed immediately
86 * after all prior requests have completed.
87 */
88 if (wqe->wr.opcode == IB_WR_REG_MR ||
89 wqe->wr.opcode == IB_WR_LOCAL_INV) {
90 int local_ops = 0;
91 int err = 0;
92
93 if (qp->s_last != qp->s_cur)
94 goto bail;
95 if (++qp->s_cur == qp->s_size)
96 qp->s_cur = 0;
97 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
98 err = rvt_invalidate_rkey(
99 qp, wqe->wr.ex.invalidate_rkey);
100 local_ops = 1;
101 }
102 rvt_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
103 : IB_WC_SUCCESS);
104 if (local_ops)
105 atomic_dec(&qp->local_ops_pending);
106 goto done_free_tx;
107 }
108 /*
109 * Start a new request.
110 */
111 qp->s_psn = wqe->psn;
112 qp->s_sge.sge = wqe->sg_list[0];
113 qp->s_sge.sg_list = wqe->sg_list + 1;
114 qp->s_sge.num_sge = wqe->wr.num_sge;
115 qp->s_sge.total_len = wqe->length;
116 len = wqe->length;
117 qp->s_len = len;
118 switch (wqe->wr.opcode) {
119 case IB_WR_SEND:
120 case IB_WR_SEND_WITH_IMM:
121 if (len > pmtu) {
122 qp->s_state = OP(SEND_FIRST);
123 len = pmtu;
124 break;
125 }
126 if (wqe->wr.opcode == IB_WR_SEND) {
127 qp->s_state = OP(SEND_ONLY);
128 } else {
129 qp->s_state =
130 OP(SEND_ONLY_WITH_IMMEDIATE);
131 /* Immediate data comes after the BTH */
132 ohdr->u.imm_data = wqe->wr.ex.imm_data;
133 hwords += 1;
134 }
135 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
136 bth0 |= IB_BTH_SOLICITED;
137 qp->s_wqe = wqe;
138 if (++qp->s_cur >= qp->s_size)
139 qp->s_cur = 0;
140 break;
141
142 case IB_WR_RDMA_WRITE:
143 case IB_WR_RDMA_WRITE_WITH_IMM:
144 ohdr->u.rc.reth.vaddr =
145 cpu_to_be64(wqe->rdma_wr.remote_addr);
146 ohdr->u.rc.reth.rkey =
147 cpu_to_be32(wqe->rdma_wr.rkey);
148 ohdr->u.rc.reth.length = cpu_to_be32(len);
149 hwords += sizeof(struct ib_reth) / 4;
150 if (len > pmtu) {
151 qp->s_state = OP(RDMA_WRITE_FIRST);
152 len = pmtu;
153 break;
154 }
155 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
156 qp->s_state = OP(RDMA_WRITE_ONLY);
157 } else {
158 qp->s_state =
159 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
160 /* Immediate data comes after the RETH */
161 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
162 hwords += 1;
163 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
164 bth0 |= IB_BTH_SOLICITED;
165 }
166 qp->s_wqe = wqe;
167 if (++qp->s_cur >= qp->s_size)
168 qp->s_cur = 0;
169 break;
170
171 default:
172 goto bail;
173 }
174 break;
175
176 case OP(SEND_FIRST):
177 qp->s_state = OP(SEND_MIDDLE);
178 fallthrough;
179 case OP(SEND_MIDDLE):
180 len = qp->s_len;
181 if (len > pmtu) {
182 len = pmtu;
183 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
184 break;
185 }
186 if (wqe->wr.opcode == IB_WR_SEND) {
187 qp->s_state = OP(SEND_LAST);
188 } else {
189 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
190 /* Immediate data comes after the BTH */
191 ohdr->u.imm_data = wqe->wr.ex.imm_data;
192 hwords += 1;
193 }
194 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
195 bth0 |= IB_BTH_SOLICITED;
196 qp->s_wqe = wqe;
197 if (++qp->s_cur >= qp->s_size)
198 qp->s_cur = 0;
199 break;
200
201 case OP(RDMA_WRITE_FIRST):
202 qp->s_state = OP(RDMA_WRITE_MIDDLE);
203 fallthrough;
204 case OP(RDMA_WRITE_MIDDLE):
205 len = qp->s_len;
206 if (len > pmtu) {
207 len = pmtu;
208 middle = HFI1_CAP_IS_KSET(SDMA_AHG);
209 break;
210 }
211 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
212 qp->s_state = OP(RDMA_WRITE_LAST);
213 } else {
214 qp->s_state =
215 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
216 /* Immediate data comes after the BTH */
217 ohdr->u.imm_data = wqe->wr.ex.imm_data;
218 hwords += 1;
219 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
220 bth0 |= IB_BTH_SOLICITED;
221 }
222 qp->s_wqe = wqe;
223 if (++qp->s_cur >= qp->s_size)
224 qp->s_cur = 0;
225 break;
226 }
227 qp->s_len -= len;
228 ps->s_txreq->hdr_dwords = hwords;
229 ps->s_txreq->sde = priv->s_sde;
230 ps->s_txreq->ss = &qp->s_sge;
231 ps->s_txreq->s_cur_size = len;
232 hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
233 qp->remote_qpn, mask_psn(qp->s_psn++),
234 middle, ps);
235 return 1;
236
237 done_free_tx:
238 hfi1_put_txreq(ps->s_txreq);
239 ps->s_txreq = NULL;
240 return 1;
241
242 bail:
243 hfi1_put_txreq(ps->s_txreq);
244
245 bail_no_tx:
246 ps->s_txreq = NULL;
247 qp->s_flags &= ~RVT_S_BUSY;
248 return 0;
249 }
250
251 /**
252 * hfi1_uc_rcv - handle an incoming UC packet
253 * @packet: the packet structure
254 *
255 * This is called from qp_rcv() to process an incoming UC packet
256 * for the given QP.
257 * Called at interrupt level.
258 */
hfi1_uc_rcv(struct hfi1_packet * packet)259 void hfi1_uc_rcv(struct hfi1_packet *packet)
260 {
261 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
262 void *data = packet->payload;
263 u32 tlen = packet->tlen;
264 struct rvt_qp *qp = packet->qp;
265 struct ib_other_headers *ohdr = packet->ohdr;
266 u32 opcode = packet->opcode;
267 u32 hdrsize = packet->hlen;
268 u32 psn;
269 u32 pad = packet->pad;
270 struct ib_wc wc;
271 u32 pmtu = qp->pmtu;
272 struct ib_reth *reth;
273 int ret;
274 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
275
276 if (hfi1_ruc_check_hdr(ibp, packet))
277 return;
278
279 process_ecn(qp, packet);
280
281 psn = ib_bth_get_psn(ohdr);
282 /* Compare the PSN verses the expected PSN. */
283 if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
284 /*
285 * Handle a sequence error.
286 * Silently drop any current message.
287 */
288 qp->r_psn = psn;
289 inv:
290 if (qp->r_state == OP(SEND_FIRST) ||
291 qp->r_state == OP(SEND_MIDDLE)) {
292 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
293 qp->r_sge.num_sge = 0;
294 } else {
295 rvt_put_ss(&qp->r_sge);
296 }
297 qp->r_state = OP(SEND_LAST);
298 switch (opcode) {
299 case OP(SEND_FIRST):
300 case OP(SEND_ONLY):
301 case OP(SEND_ONLY_WITH_IMMEDIATE):
302 goto send_first;
303
304 case OP(RDMA_WRITE_FIRST):
305 case OP(RDMA_WRITE_ONLY):
306 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
307 goto rdma_first;
308
309 default:
310 goto drop;
311 }
312 }
313
314 /* Check for opcode sequence errors. */
315 switch (qp->r_state) {
316 case OP(SEND_FIRST):
317 case OP(SEND_MIDDLE):
318 if (opcode == OP(SEND_MIDDLE) ||
319 opcode == OP(SEND_LAST) ||
320 opcode == OP(SEND_LAST_WITH_IMMEDIATE))
321 break;
322 goto inv;
323
324 case OP(RDMA_WRITE_FIRST):
325 case OP(RDMA_WRITE_MIDDLE):
326 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
327 opcode == OP(RDMA_WRITE_LAST) ||
328 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
329 break;
330 goto inv;
331
332 default:
333 if (opcode == OP(SEND_FIRST) ||
334 opcode == OP(SEND_ONLY) ||
335 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
336 opcode == OP(RDMA_WRITE_FIRST) ||
337 opcode == OP(RDMA_WRITE_ONLY) ||
338 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
339 break;
340 goto inv;
341 }
342
343 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
344 rvt_comm_est(qp);
345
346 /* OK, process the packet. */
347 switch (opcode) {
348 case OP(SEND_FIRST):
349 case OP(SEND_ONLY):
350 case OP(SEND_ONLY_WITH_IMMEDIATE):
351 send_first:
352 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
353 qp->r_sge = qp->s_rdma_read_sge;
354 } else {
355 ret = rvt_get_rwqe(qp, false);
356 if (ret < 0)
357 goto op_err;
358 if (!ret)
359 goto drop;
360 /*
361 * qp->s_rdma_read_sge will be the owner
362 * of the mr references.
363 */
364 qp->s_rdma_read_sge = qp->r_sge;
365 }
366 qp->r_rcv_len = 0;
367 if (opcode == OP(SEND_ONLY))
368 goto no_immediate_data;
369 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
370 goto send_last_imm;
371 fallthrough;
372 case OP(SEND_MIDDLE):
373 /* Check for invalid length PMTU or posted rwqe len. */
374 /*
375 * There will be no padding for 9B packet but 16B packets
376 * will come in with some padding since we always add
377 * CRC and LT bytes which will need to be flit aligned
378 */
379 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
380 goto rewind;
381 qp->r_rcv_len += pmtu;
382 if (unlikely(qp->r_rcv_len > qp->r_len))
383 goto rewind;
384 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
385 break;
386
387 case OP(SEND_LAST_WITH_IMMEDIATE):
388 send_last_imm:
389 wc.ex.imm_data = ohdr->u.imm_data;
390 wc.wc_flags = IB_WC_WITH_IMM;
391 goto send_last;
392 case OP(SEND_LAST):
393 no_immediate_data:
394 wc.ex.imm_data = 0;
395 wc.wc_flags = 0;
396 send_last:
397 /* Check for invalid length. */
398 /* LAST len should be >= 1 */
399 if (unlikely(tlen < (hdrsize + extra_bytes)))
400 goto rewind;
401 /* Don't count the CRC. */
402 tlen -= (hdrsize + extra_bytes);
403 wc.byte_len = tlen + qp->r_rcv_len;
404 if (unlikely(wc.byte_len > qp->r_len))
405 goto rewind;
406 wc.opcode = IB_WC_RECV;
407 rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
408 rvt_put_ss(&qp->s_rdma_read_sge);
409 last_imm:
410 wc.wr_id = qp->r_wr_id;
411 wc.status = IB_WC_SUCCESS;
412 wc.qp = &qp->ibqp;
413 wc.src_qp = qp->remote_qpn;
414 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
415 /*
416 * It seems that IB mandates the presence of an SL in a
417 * work completion only for the UD transport (see section
418 * 11.4.2 of IBTA Vol. 1).
419 *
420 * However, the way the SL is chosen below is consistent
421 * with the way that IB/qib works and is trying avoid
422 * introducing incompatibilities.
423 *
424 * See also OPA Vol. 1, section 9.7.6, and table 9-17.
425 */
426 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
427 /* zero fields that are N/A */
428 wc.vendor_err = 0;
429 wc.pkey_index = 0;
430 wc.dlid_path_bits = 0;
431 wc.port_num = 0;
432 /* Signal completion event if the solicited bit is set. */
433 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
434 break;
435
436 case OP(RDMA_WRITE_FIRST):
437 case OP(RDMA_WRITE_ONLY):
438 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
439 rdma_first:
440 if (unlikely(!(qp->qp_access_flags &
441 IB_ACCESS_REMOTE_WRITE))) {
442 goto drop;
443 }
444 reth = &ohdr->u.rc.reth;
445 qp->r_len = be32_to_cpu(reth->length);
446 qp->r_rcv_len = 0;
447 qp->r_sge.sg_list = NULL;
448 if (qp->r_len != 0) {
449 u32 rkey = be32_to_cpu(reth->rkey);
450 u64 vaddr = be64_to_cpu(reth->vaddr);
451 int ok;
452
453 /* Check rkey */
454 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
455 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
456 if (unlikely(!ok))
457 goto drop;
458 qp->r_sge.num_sge = 1;
459 } else {
460 qp->r_sge.num_sge = 0;
461 qp->r_sge.sge.mr = NULL;
462 qp->r_sge.sge.vaddr = NULL;
463 qp->r_sge.sge.length = 0;
464 qp->r_sge.sge.sge_length = 0;
465 }
466 if (opcode == OP(RDMA_WRITE_ONLY)) {
467 goto rdma_last;
468 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
469 wc.ex.imm_data = ohdr->u.rc.imm_data;
470 goto rdma_last_imm;
471 }
472 fallthrough;
473 case OP(RDMA_WRITE_MIDDLE):
474 /* Check for invalid length PMTU or posted rwqe len. */
475 if (unlikely(tlen != (hdrsize + pmtu + 4)))
476 goto drop;
477 qp->r_rcv_len += pmtu;
478 if (unlikely(qp->r_rcv_len > qp->r_len))
479 goto drop;
480 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
481 break;
482
483 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
484 wc.ex.imm_data = ohdr->u.imm_data;
485 rdma_last_imm:
486 wc.wc_flags = IB_WC_WITH_IMM;
487
488 /* Check for invalid length. */
489 /* LAST len should be >= 1 */
490 if (unlikely(tlen < (hdrsize + pad + 4)))
491 goto drop;
492 /* Don't count the CRC. */
493 tlen -= (hdrsize + extra_bytes);
494 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
495 goto drop;
496 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
497 rvt_put_ss(&qp->s_rdma_read_sge);
498 } else {
499 ret = rvt_get_rwqe(qp, true);
500 if (ret < 0)
501 goto op_err;
502 if (!ret)
503 goto drop;
504 }
505 wc.byte_len = qp->r_len;
506 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
507 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
508 rvt_put_ss(&qp->r_sge);
509 goto last_imm;
510
511 case OP(RDMA_WRITE_LAST):
512 rdma_last:
513 /* Check for invalid length. */
514 /* LAST len should be >= 1 */
515 if (unlikely(tlen < (hdrsize + pad + 4)))
516 goto drop;
517 /* Don't count the CRC. */
518 tlen -= (hdrsize + extra_bytes);
519 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
520 goto drop;
521 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
522 rvt_put_ss(&qp->r_sge);
523 break;
524
525 default:
526 /* Drop packet for unknown opcodes. */
527 goto drop;
528 }
529 qp->r_psn++;
530 qp->r_state = opcode;
531 return;
532
533 rewind:
534 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
535 qp->r_sge.num_sge = 0;
536 drop:
537 ibp->rvp.n_pkt_drops++;
538 return;
539
540 op_err:
541 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
542 }
543