1 /*
2 * Copyright(c) 2015 - 2018 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48 #include <linux/spinlock.h>
49
50 #include "hfi.h"
51 #include "mad.h"
52 #include "qp.h"
53 #include "verbs_txreq.h"
54 #include "trace.h"
55
56 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
57 {
58 return (gid->global.interface_id == id &&
59 (gid->global.subnet_prefix == gid_prefix ||
60 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
61 }
62
63 /*
64 *
65 * This should be called with the QP r_lock held.
66 *
67 * The s_lock will be acquired around the hfi1_migrate_qp() call.
68 */
69 int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet)
70 {
71 __be64 guid;
72 unsigned long flags;
73 struct rvt_qp *qp = packet->qp;
74 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
75 u32 dlid = packet->dlid;
76 u32 slid = packet->slid;
77 u32 sl = packet->sl;
78 bool migrated = packet->migrated;
79 u16 pkey = packet->pkey;
80
81 if (qp->s_mig_state == IB_MIG_ARMED && migrated) {
82 if (!packet->grh) {
83 if ((rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
84 IB_AH_GRH) &&
85 (packet->etype != RHF_RCV_TYPE_BYPASS))
86 return 1;
87 } else {
88 const struct ib_global_route *grh;
89
90 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
91 IB_AH_GRH))
92 return 1;
93 grh = rdma_ah_read_grh(&qp->alt_ah_attr);
94 guid = get_sguid(ibp, grh->sgid_index);
95 if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix,
96 guid))
97 return 1;
98 if (!gid_ok(
99 &packet->grh->sgid,
100 grh->dgid.global.subnet_prefix,
101 grh->dgid.global.interface_id))
102 return 1;
103 }
104 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey,
105 sc5, slid))) {
106 hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num,
107 slid, dlid);
108 return 1;
109 }
110 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
111 if (slid != rdma_ah_get_dlid(&qp->alt_ah_attr) ||
112 ppd_from_ibp(ibp)->port !=
113 rdma_ah_get_port_num(&qp->alt_ah_attr))
114 return 1;
115 spin_lock_irqsave(&qp->s_lock, flags);
116 hfi1_migrate_qp(qp);
117 spin_unlock_irqrestore(&qp->s_lock, flags);
118 } else {
119 if (!packet->grh) {
120 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
121 IB_AH_GRH) &&
122 (packet->etype != RHF_RCV_TYPE_BYPASS))
123 return 1;
124 } else {
125 const struct ib_global_route *grh;
126
127 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
128 IB_AH_GRH))
129 return 1;
130 grh = rdma_ah_read_grh(&qp->remote_ah_attr);
131 guid = get_sguid(ibp, grh->sgid_index);
132 if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix,
133 guid))
134 return 1;
135 if (!gid_ok(
136 &packet->grh->sgid,
137 grh->dgid.global.subnet_prefix,
138 grh->dgid.global.interface_id))
139 return 1;
140 }
141 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey,
142 sc5, slid))) {
143 hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num,
144 slid, dlid);
145 return 1;
146 }
147 /* Validate the SLID. See Ch. 9.6.1.5 */
148 if ((slid != rdma_ah_get_dlid(&qp->remote_ah_attr)) ||
149 ppd_from_ibp(ibp)->port != qp->port_num)
150 return 1;
151 if (qp->s_mig_state == IB_MIG_REARM && !migrated)
152 qp->s_mig_state = IB_MIG_ARMED;
153 }
154
155 return 0;
156 }
157
158 /**
159 * hfi1_make_grh - construct a GRH header
160 * @ibp: a pointer to the IB port
161 * @hdr: a pointer to the GRH header being constructed
162 * @grh: the global route address to send to
163 * @hwords: size of header after grh being sent in dwords
164 * @nwords: the number of 32 bit words of data being sent
165 *
166 * Return the size of the header in 32 bit words.
167 */
168 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
169 const struct ib_global_route *grh, u32 hwords, u32 nwords)
170 {
171 hdr->version_tclass_flow =
172 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
173 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
174 (grh->flow_label << IB_GRH_FLOW_SHIFT));
175 hdr->paylen = cpu_to_be16((hwords + nwords) << 2);
176 /* next_hdr is defined by C8-7 in ch. 8.4.1 */
177 hdr->next_hdr = IB_GRH_NEXT_HDR;
178 hdr->hop_limit = grh->hop_limit;
179 /* The SGID is 32-bit aligned. */
180 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
181 hdr->sgid.global.interface_id =
182 grh->sgid_index < HFI1_GUIDS_PER_PORT ?
183 get_sguid(ibp, grh->sgid_index) :
184 get_sguid(ibp, HFI1_PORT_GUID_INDEX);
185 hdr->dgid = grh->dgid;
186
187 /* GRH header size in 32-bit words. */
188 return sizeof(struct ib_grh) / sizeof(u32);
189 }
190
191 #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \
192 hdr.ibh.u.oth.bth[2]) / 4)
193
194 /**
195 * build_ahg - create ahg in s_ahg
196 * @qp: a pointer to QP
197 * @npsn: the next PSN for the request/response
198 *
199 * This routine handles the AHG by allocating an ahg entry and causing the
200 * copy of the first middle.
201 *
202 * Subsequent middles use the copied entry, editing the
203 * PSN with 1 or 2 edits.
204 */
205 static inline void build_ahg(struct rvt_qp *qp, u32 npsn)
206 {
207 struct hfi1_qp_priv *priv = qp->priv;
208
209 if (unlikely(qp->s_flags & HFI1_S_AHG_CLEAR))
210 clear_ahg(qp);
211 if (!(qp->s_flags & HFI1_S_AHG_VALID)) {
212 /* first middle that needs copy */
213 if (qp->s_ahgidx < 0)
214 qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde);
215 if (qp->s_ahgidx >= 0) {
216 qp->s_ahgpsn = npsn;
217 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY;
218 /* save to protect a change in another thread */
219 priv->s_ahg->ahgidx = qp->s_ahgidx;
220 qp->s_flags |= HFI1_S_AHG_VALID;
221 }
222 } else {
223 /* subsequent middle after valid */
224 if (qp->s_ahgidx >= 0) {
225 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG;
226 priv->s_ahg->ahgidx = qp->s_ahgidx;
227 priv->s_ahg->ahgcount++;
228 priv->s_ahg->ahgdesc[0] =
229 sdma_build_ahg_descriptor(
230 (__force u16)cpu_to_be16((u16)npsn),
231 BTH2_OFFSET,
232 16,
233 16);
234 if ((npsn & 0xffff0000) !=
235 (qp->s_ahgpsn & 0xffff0000)) {
236 priv->s_ahg->ahgcount++;
237 priv->s_ahg->ahgdesc[1] =
238 sdma_build_ahg_descriptor(
239 (__force u16)cpu_to_be16(
240 (u16)(npsn >> 16)),
241 BTH2_OFFSET,
242 0,
243 16);
244 }
245 }
246 }
247 }
248
249 static inline void hfi1_make_ruc_bth(struct rvt_qp *qp,
250 struct ib_other_headers *ohdr,
251 u32 bth0, u32 bth1, u32 bth2)
252 {
253 ohdr->bth[0] = cpu_to_be32(bth0);
254 ohdr->bth[1] = cpu_to_be32(bth1);
255 ohdr->bth[2] = cpu_to_be32(bth2);
256 }
257
258 /**
259 * hfi1_make_ruc_header_16B - build a 16B header
260 * @qp: the queue pair
261 * @ohdr: a pointer to the destination header memory
262 * @bth0: bth0 passed in from the RC/UC builder
263 * @bth2: bth2 passed in from the RC/UC builder
264 * @middle: non zero implies indicates ahg "could" be used
265 * @ps: the current packet state
266 *
267 * This routine may disarm ahg under these situations:
268 * - packet needs a GRH
269 * - BECN needed
270 * - migration state not IB_MIG_MIGRATED
271 */
272 static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
273 struct ib_other_headers *ohdr,
274 u32 bth0, u32 bth1, u32 bth2,
275 int middle,
276 struct hfi1_pkt_state *ps)
277 {
278 struct hfi1_qp_priv *priv = qp->priv;
279 struct hfi1_ibport *ibp = ps->ibp;
280 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
281 u32 slid;
282 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
283 u8 l4 = OPA_16B_L4_IB_LOCAL;
284 u8 extra_bytes = hfi1_get_16b_padding(
285 (ps->s_txreq->hdr_dwords << 2),
286 ps->s_txreq->s_cur_size);
287 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size +
288 extra_bytes + SIZE_OF_LT) >> 2);
289 bool becn = false;
290
291 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
292 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) {
293 struct ib_grh *grh;
294 struct ib_global_route *grd =
295 rdma_ah_retrieve_grh(&qp->remote_ah_attr);
296 /*
297 * Ensure OPA GIDs are transformed to IB gids
298 * before creating the GRH.
299 */
300 if (grd->sgid_index == OPA_GID_INDEX)
301 grd->sgid_index = 0;
302 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
303 l4 = OPA_16B_L4_IB_GLOBAL;
304 ps->s_txreq->hdr_dwords +=
305 hfi1_make_grh(ibp, grh, grd,
306 ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
307 nwords);
308 middle = 0;
309 }
310
311 if (qp->s_mig_state == IB_MIG_MIGRATED)
312 bth1 |= OPA_BTH_MIG_REQ;
313 else
314 middle = 0;
315
316 if (qp->s_flags & RVT_S_ECN) {
317 qp->s_flags &= ~RVT_S_ECN;
318 /* we recently received a FECN, so return a BECN */
319 becn = true;
320 middle = 0;
321 }
322 if (middle)
323 build_ahg(qp, bth2);
324 else
325 qp->s_flags &= ~HFI1_S_AHG_VALID;
326
327 bth0 |= pkey;
328 bth0 |= extra_bytes << 20;
329 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
330
331 if (!ppd->lid)
332 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
333 else
334 slid = ppd->lid |
335 (rdma_ah_get_path_bits(&qp->remote_ah_attr) &
336 ((1 << ppd->lmc) - 1));
337
338 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
339 slid,
340 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr),
341 16B),
342 (ps->s_txreq->hdr_dwords + nwords) >> 1,
343 pkey, becn, 0, l4, priv->s_sc);
344 }
345
346 /**
347 * hfi1_make_ruc_header_9B - build a 9B header
348 * @qp: the queue pair
349 * @ohdr: a pointer to the destination header memory
350 * @bth0: bth0 passed in from the RC/UC builder
351 * @bth2: bth2 passed in from the RC/UC builder
352 * @middle: non zero implies indicates ahg "could" be used
353 * @ps: the current packet state
354 *
355 * This routine may disarm ahg under these situations:
356 * - packet needs a GRH
357 * - BECN needed
358 * - migration state not IB_MIG_MIGRATED
359 */
360 static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp,
361 struct ib_other_headers *ohdr,
362 u32 bth0, u32 bth1, u32 bth2,
363 int middle,
364 struct hfi1_pkt_state *ps)
365 {
366 struct hfi1_qp_priv *priv = qp->priv;
367 struct hfi1_ibport *ibp = ps->ibp;
368 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
369 u16 lrh0 = HFI1_LRH_BTH;
370 u8 extra_bytes = -ps->s_txreq->s_cur_size & 3;
371 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size +
372 extra_bytes) >> 2);
373
374 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
375 struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
376
377 lrh0 = HFI1_LRH_GRH;
378 ps->s_txreq->hdr_dwords +=
379 hfi1_make_grh(ibp, grh,
380 rdma_ah_read_grh(&qp->remote_ah_attr),
381 ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
382 nwords);
383 middle = 0;
384 }
385 lrh0 |= (priv->s_sc & 0xf) << 12 |
386 (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4;
387
388 if (qp->s_mig_state == IB_MIG_MIGRATED)
389 bth0 |= IB_BTH_MIG_REQ;
390 else
391 middle = 0;
392
393 if (qp->s_flags & RVT_S_ECN) {
394 qp->s_flags &= ~RVT_S_ECN;
395 /* we recently received a FECN, so return a BECN */
396 bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT);
397 middle = 0;
398 }
399 if (middle)
400 build_ahg(qp, bth2);
401 else
402 qp->s_flags &= ~HFI1_S_AHG_VALID;
403
404 bth0 |= pkey;
405 bth0 |= extra_bytes << 20;
406 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
407 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
408 lrh0,
409 ps->s_txreq->hdr_dwords + nwords,
410 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B),
411 ppd_from_ibp(ibp)->lid |
412 rdma_ah_get_path_bits(&qp->remote_ah_attr));
413 }
414
415 typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp,
416 struct ib_other_headers *ohdr,
417 u32 bth0, u32 bth1, u32 bth2, int middle,
418 struct hfi1_pkt_state *ps);
419
420 /* We support only two types - 9B and 16B for now */
421 static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = {
422 [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B,
423 [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B
424 };
425
426 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
427 u32 bth0, u32 bth1, u32 bth2, int middle,
428 struct hfi1_pkt_state *ps)
429 {
430 struct hfi1_qp_priv *priv = qp->priv;
431
432 /*
433 * reset s_ahg/AHG fields
434 *
435 * This insures that the ahgentry/ahgcount
436 * are at a non-AHG default to protect
437 * build_verbs_tx_desc() from using
438 * an include ahgidx.
439 *
440 * build_ahg() will modify as appropriate
441 * to use the AHG feature.
442 */
443 priv->s_ahg->tx_flags = 0;
444 priv->s_ahg->ahgcount = 0;
445 priv->s_ahg->ahgidx = 0;
446
447 /* Make the appropriate header */
448 hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth1, bth2, middle,
449 ps);
450 }
451
452 /* when sending, force a reschedule every one of these periods */
453 #define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */
454
455 /**
456 * hfi1_schedule_send_yield - test for a yield required for QP
457 * send engine
458 * @timeout: Final time for timeout slice for jiffies
459 * @qp: a pointer to QP
460 * @ps: a pointer to a structure with commonly lookup values for
461 * the the send engine progress
462 * @tid - true if it is the tid leg
463 *
464 * This routine checks if the time slice for the QP has expired
465 * for RC QPs, if so an additional work entry is queued. At this
466 * point, other QPs have an opportunity to be scheduled. It
467 * returns true if a yield is required, otherwise, false
468 * is returned.
469 */
470 bool hfi1_schedule_send_yield(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
471 bool tid)
472 {
473 ps->pkts_sent = true;
474
475 if (unlikely(time_after(jiffies, ps->timeout))) {
476 if (!ps->in_thread ||
477 workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) {
478 spin_lock_irqsave(&qp->s_lock, ps->flags);
479 if (!tid) {
480 qp->s_flags &= ~RVT_S_BUSY;
481 hfi1_schedule_send(qp);
482 } else {
483 struct hfi1_qp_priv *priv = qp->priv;
484
485 if (priv->s_flags &
486 HFI1_S_TID_BUSY_SET) {
487 qp->s_flags &= ~RVT_S_BUSY;
488 priv->s_flags &=
489 ~(HFI1_S_TID_BUSY_SET |
490 RVT_S_BUSY);
491 } else {
492 priv->s_flags &= ~RVT_S_BUSY;
493 }
494 hfi1_schedule_tid_send(qp);
495 }
496
497 spin_unlock_irqrestore(&qp->s_lock, ps->flags);
498 this_cpu_inc(*ps->ppd->dd->send_schedule);
499 trace_hfi1_rc_expired_time_slice(qp, true);
500 return true;
501 }
502
503 cond_resched();
504 this_cpu_inc(*ps->ppd->dd->send_schedule);
505 ps->timeout = jiffies + ps->timeout_int;
506 }
507
508 trace_hfi1_rc_expired_time_slice(qp, false);
509 return false;
510 }
511
512 void hfi1_do_send_from_rvt(struct rvt_qp *qp)
513 {
514 hfi1_do_send(qp, false);
515 }
516
517 void _hfi1_do_send(struct work_struct *work)
518 {
519 struct iowait_work *w = container_of(work, struct iowait_work, iowork);
520 struct rvt_qp *qp = iowait_to_qp(w->iow);
521
522 hfi1_do_send(qp, true);
523 }
524
525 /**
526 * hfi1_do_send - perform a send on a QP
527 * @qp: a pointer to the QP
528 * @in_thread: true if in a workqueue thread
529 *
530 * Process entries in the send work queue until credit or queue is
531 * exhausted. Only allow one CPU to send a packet per QP.
532 * Otherwise, two threads could send packets out of order.
533 */
534 void hfi1_do_send(struct rvt_qp *qp, bool in_thread)
535 {
536 struct hfi1_pkt_state ps;
537 struct hfi1_qp_priv *priv = qp->priv;
538 int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps);
539
540 ps.dev = to_idev(qp->ibqp.device);
541 ps.ibp = to_iport(qp->ibqp.device, qp->port_num);
542 ps.ppd = ppd_from_ibp(ps.ibp);
543 ps.in_thread = in_thread;
544 ps.wait = iowait_get_ib_work(&priv->s_iowait);
545
546 trace_hfi1_rc_do_send(qp, in_thread);
547
548 switch (qp->ibqp.qp_type) {
549 case IB_QPT_RC:
550 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) &
551 ~((1 << ps.ppd->lmc) - 1)) ==
552 ps.ppd->lid)) {
553 rvt_ruc_loopback(qp);
554 return;
555 }
556 make_req = hfi1_make_rc_req;
557 ps.timeout_int = qp->timeout_jiffies;
558 break;
559 case IB_QPT_UC:
560 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) &
561 ~((1 << ps.ppd->lmc) - 1)) ==
562 ps.ppd->lid)) {
563 rvt_ruc_loopback(qp);
564 return;
565 }
566 make_req = hfi1_make_uc_req;
567 ps.timeout_int = SEND_RESCHED_TIMEOUT;
568 break;
569 default:
570 make_req = hfi1_make_ud_req;
571 ps.timeout_int = SEND_RESCHED_TIMEOUT;
572 }
573
574 spin_lock_irqsave(&qp->s_lock, ps.flags);
575
576 /* Return if we are already busy processing a work request. */
577 if (!hfi1_send_ok(qp)) {
578 if (qp->s_flags & HFI1_S_ANY_WAIT_IO)
579 iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB);
580 spin_unlock_irqrestore(&qp->s_lock, ps.flags);
581 return;
582 }
583
584 qp->s_flags |= RVT_S_BUSY;
585
586 ps.timeout_int = ps.timeout_int / 8;
587 ps.timeout = jiffies + ps.timeout_int;
588 ps.cpu = priv->s_sde ? priv->s_sde->cpu :
589 cpumask_first(cpumask_of_node(ps.ppd->dd->node));
590 ps.pkts_sent = false;
591
592 /* insure a pre-built packet is handled */
593 ps.s_txreq = get_waiting_verbs_txreq(ps.wait);
594 do {
595 /* Check for a constructed packet to be sent. */
596 if (ps.s_txreq) {
597 if (priv->s_flags & HFI1_S_TID_BUSY_SET)
598 qp->s_flags |= RVT_S_BUSY;
599 spin_unlock_irqrestore(&qp->s_lock, ps.flags);
600 /*
601 * If the packet cannot be sent now, return and
602 * the send engine will be woken up later.
603 */
604 if (hfi1_verbs_send(qp, &ps))
605 return;
606
607 /* allow other tasks to run */
608 if (hfi1_schedule_send_yield(qp, &ps, false))
609 return;
610
611 spin_lock_irqsave(&qp->s_lock, ps.flags);
612 }
613 } while (make_req(qp, &ps));
614 iowait_starve_clear(ps.pkts_sent, &priv->s_iowait);
615 spin_unlock_irqrestore(&qp->s_lock, ps.flags);
616 }