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 56static 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 */ 69int 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 */ 168u32 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 */ 205static 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 249static 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 */ 272static 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 */ 360static 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 415typedef 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 */ 421static 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 426void 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 */ 470bool 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 512void hfi1_do_send_from_rvt(struct rvt_qp *qp) 513{ 514 hfi1_do_send(qp, false); 515} 516 517void _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 */ 534void 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} 617