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 bth1 |= qp->remote_qpn; 254 ohdr->bth[0] = cpu_to_be32(bth0); 255 ohdr->bth[1] = cpu_to_be32(bth1); 256 ohdr->bth[2] = cpu_to_be32(bth2); 257 } 258 259 /** 260 * hfi1_make_ruc_header_16B - build a 16B header 261 * @qp: the queue pair 262 * @ohdr: a pointer to the destination header memory 263 * @bth0: bth0 passed in from the RC/UC builder 264 * @bth2: bth2 passed in from the RC/UC builder 265 * @middle: non zero implies indicates ahg "could" be used 266 * @ps: the current packet state 267 * 268 * This routine may disarm ahg under these situations: 269 * - packet needs a GRH 270 * - BECN needed 271 * - migration state not IB_MIG_MIGRATED 272 */ 273 static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp, 274 struct ib_other_headers *ohdr, 275 u32 bth0, u32 bth2, 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 bth1 = 0; 282 u32 slid; 283 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 284 u8 l4 = OPA_16B_L4_IB_LOCAL; 285 u8 extra_bytes = hfi1_get_16b_padding( 286 (ps->s_txreq->hdr_dwords << 2), 287 ps->s_txreq->s_cur_size); 288 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 289 extra_bytes + SIZE_OF_LT) >> 2); 290 bool becn = false; 291 292 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && 293 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { 294 struct ib_grh *grh; 295 struct ib_global_route *grd = 296 rdma_ah_retrieve_grh(&qp->remote_ah_attr); 297 /* 298 * Ensure OPA GIDs are transformed to IB gids 299 * before creating the GRH. 300 */ 301 if (grd->sgid_index == OPA_GID_INDEX) 302 grd->sgid_index = 0; 303 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; 304 l4 = OPA_16B_L4_IB_GLOBAL; 305 ps->s_txreq->hdr_dwords += 306 hfi1_make_grh(ibp, grh, grd, 307 ps->s_txreq->hdr_dwords - LRH_16B_DWORDS, 308 nwords); 309 middle = 0; 310 } 311 312 if (qp->s_mig_state == IB_MIG_MIGRATED) 313 bth1 |= OPA_BTH_MIG_REQ; 314 else 315 middle = 0; 316 317 if (qp->s_flags & RVT_S_ECN) { 318 qp->s_flags &= ~RVT_S_ECN; 319 /* we recently received a FECN, so return a BECN */ 320 becn = true; 321 middle = 0; 322 } 323 if (middle) 324 build_ahg(qp, bth2); 325 else 326 qp->s_flags &= ~HFI1_S_AHG_VALID; 327 328 bth0 |= pkey; 329 bth0 |= extra_bytes << 20; 330 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 331 332 if (!ppd->lid) 333 slid = be32_to_cpu(OPA_LID_PERMISSIVE); 334 else 335 slid = ppd->lid | 336 (rdma_ah_get_path_bits(&qp->remote_ah_attr) & 337 ((1 << ppd->lmc) - 1)); 338 339 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, 340 slid, 341 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 342 16B), 343 (ps->s_txreq->hdr_dwords + nwords) >> 1, 344 pkey, becn, 0, l4, priv->s_sc); 345 } 346 347 /** 348 * hfi1_make_ruc_header_9B - build a 9B header 349 * @qp: the queue pair 350 * @ohdr: a pointer to the destination header memory 351 * @bth0: bth0 passed in from the RC/UC builder 352 * @bth2: bth2 passed in from the RC/UC builder 353 * @middle: non zero implies indicates ahg "could" be used 354 * @ps: the current packet state 355 * 356 * This routine may disarm ahg under these situations: 357 * - packet needs a GRH 358 * - BECN needed 359 * - migration state not IB_MIG_MIGRATED 360 */ 361 static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp, 362 struct ib_other_headers *ohdr, 363 u32 bth0, u32 bth2, 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 u32 bth1 = 0; 369 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 370 u16 lrh0 = HFI1_LRH_BTH; 371 u8 extra_bytes = -ps->s_txreq->s_cur_size & 3; 372 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 373 extra_bytes) >> 2); 374 375 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 376 struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; 377 378 lrh0 = HFI1_LRH_GRH; 379 ps->s_txreq->hdr_dwords += 380 hfi1_make_grh(ibp, grh, 381 rdma_ah_read_grh(&qp->remote_ah_attr), 382 ps->s_txreq->hdr_dwords - LRH_9B_DWORDS, 383 nwords); 384 middle = 0; 385 } 386 lrh0 |= (priv->s_sc & 0xf) << 12 | 387 (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4; 388 389 if (qp->s_mig_state == IB_MIG_MIGRATED) 390 bth0 |= IB_BTH_MIG_REQ; 391 else 392 middle = 0; 393 394 if (qp->s_flags & RVT_S_ECN) { 395 qp->s_flags &= ~RVT_S_ECN; 396 /* we recently received a FECN, so return a BECN */ 397 bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT); 398 middle = 0; 399 } 400 if (middle) 401 build_ahg(qp, bth2); 402 else 403 qp->s_flags &= ~HFI1_S_AHG_VALID; 404 405 bth0 |= pkey; 406 bth0 |= extra_bytes << 20; 407 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 408 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, 409 lrh0, 410 ps->s_txreq->hdr_dwords + nwords, 411 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), 412 ppd_from_ibp(ibp)->lid | 413 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 414 } 415 416 typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp, 417 struct ib_other_headers *ohdr, 418 u32 bth0, u32 bth2, int middle, 419 struct hfi1_pkt_state *ps); 420 421 /* We support only two types - 9B and 16B for now */ 422 static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = { 423 [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B, 424 [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B 425 }; 426 427 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 428 u32 bth0, u32 bth2, int middle, 429 struct hfi1_pkt_state *ps) 430 { 431 struct hfi1_qp_priv *priv = qp->priv; 432 433 /* 434 * reset s_ahg/AHG fields 435 * 436 * This insures that the ahgentry/ahgcount 437 * are at a non-AHG default to protect 438 * build_verbs_tx_desc() from using 439 * an include ahgidx. 440 * 441 * build_ahg() will modify as appropriate 442 * to use the AHG feature. 443 */ 444 priv->s_ahg->tx_flags = 0; 445 priv->s_ahg->ahgcount = 0; 446 priv->s_ahg->ahgidx = 0; 447 448 /* Make the appropriate header */ 449 hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth2, middle, 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 * schedule_send_yield - test for a yield required for QP send engine 457 * @timeout: Final time for timeout slice for jiffies 458 * @qp: a pointer to QP 459 * @ps: a pointer to a structure with commonly lookup values for 460 * the the send engine progress 461 * 462 * This routine checks if the time slice for the QP has expired 463 * for RC QPs, if so an additional work entry is queued. At this 464 * point, other QPs have an opportunity to be scheduled. It 465 * returns true if a yield is required, otherwise, false 466 * is returned. 467 */ 468 static bool schedule_send_yield(struct rvt_qp *qp, 469 struct hfi1_pkt_state *ps) 470 { 471 ps->pkts_sent = true; 472 473 if (unlikely(time_after(jiffies, ps->timeout))) { 474 if (!ps->in_thread || 475 workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) { 476 spin_lock_irqsave(&qp->s_lock, ps->flags); 477 qp->s_flags &= ~RVT_S_BUSY; 478 hfi1_schedule_send(qp); 479 spin_unlock_irqrestore(&qp->s_lock, ps->flags); 480 this_cpu_inc(*ps->ppd->dd->send_schedule); 481 trace_hfi1_rc_expired_time_slice(qp, true); 482 return true; 483 } 484 485 cond_resched(); 486 this_cpu_inc(*ps->ppd->dd->send_schedule); 487 ps->timeout = jiffies + ps->timeout_int; 488 } 489 490 trace_hfi1_rc_expired_time_slice(qp, false); 491 return false; 492 } 493 494 void hfi1_do_send_from_rvt(struct rvt_qp *qp) 495 { 496 hfi1_do_send(qp, false); 497 } 498 499 void _hfi1_do_send(struct work_struct *work) 500 { 501 struct iowait_work *w = container_of(work, struct iowait_work, iowork); 502 struct rvt_qp *qp = iowait_to_qp(w->iow); 503 504 hfi1_do_send(qp, true); 505 } 506 507 /** 508 * hfi1_do_send - perform a send on a QP 509 * @work: contains a pointer to the QP 510 * @in_thread: true if in a workqueue thread 511 * 512 * Process entries in the send work queue until credit or queue is 513 * exhausted. Only allow one CPU to send a packet per QP. 514 * Otherwise, two threads could send packets out of order. 515 */ 516 void hfi1_do_send(struct rvt_qp *qp, bool in_thread) 517 { 518 struct hfi1_pkt_state ps; 519 struct hfi1_qp_priv *priv = qp->priv; 520 int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); 521 522 ps.dev = to_idev(qp->ibqp.device); 523 ps.ibp = to_iport(qp->ibqp.device, qp->port_num); 524 ps.ppd = ppd_from_ibp(ps.ibp); 525 ps.in_thread = in_thread; 526 ps.wait = iowait_get_ib_work(&priv->s_iowait); 527 528 trace_hfi1_rc_do_send(qp, in_thread); 529 530 switch (qp->ibqp.qp_type) { 531 case IB_QPT_RC: 532 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 533 ~((1 << ps.ppd->lmc) - 1)) == 534 ps.ppd->lid)) { 535 rvt_ruc_loopback(qp); 536 return; 537 } 538 make_req = hfi1_make_rc_req; 539 ps.timeout_int = qp->timeout_jiffies; 540 break; 541 case IB_QPT_UC: 542 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 543 ~((1 << ps.ppd->lmc) - 1)) == 544 ps.ppd->lid)) { 545 rvt_ruc_loopback(qp); 546 return; 547 } 548 make_req = hfi1_make_uc_req; 549 ps.timeout_int = SEND_RESCHED_TIMEOUT; 550 break; 551 default: 552 make_req = hfi1_make_ud_req; 553 ps.timeout_int = SEND_RESCHED_TIMEOUT; 554 } 555 556 spin_lock_irqsave(&qp->s_lock, ps.flags); 557 558 /* Return if we are already busy processing a work request. */ 559 if (!hfi1_send_ok(qp)) { 560 if (qp->s_flags & HFI1_S_ANY_WAIT_IO) 561 iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB); 562 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 563 return; 564 } 565 566 qp->s_flags |= RVT_S_BUSY; 567 568 ps.timeout_int = ps.timeout_int / 8; 569 ps.timeout = jiffies + ps.timeout_int; 570 ps.cpu = priv->s_sde ? priv->s_sde->cpu : 571 cpumask_first(cpumask_of_node(ps.ppd->dd->node)); 572 ps.pkts_sent = false; 573 574 /* insure a pre-built packet is handled */ 575 ps.s_txreq = get_waiting_verbs_txreq(ps.wait); 576 do { 577 /* Check for a constructed packet to be sent. */ 578 if (ps.s_txreq) { 579 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 580 /* 581 * If the packet cannot be sent now, return and 582 * the send engine will be woken up later. 583 */ 584 if (hfi1_verbs_send(qp, &ps)) 585 return; 586 587 /* allow other tasks to run */ 588 if (schedule_send_yield(qp, &ps)) 589 return; 590 591 spin_lock_irqsave(&qp->s_lock, ps.flags); 592 } 593 } while (make_req(qp, &ps)); 594 iowait_starve_clear(ps.pkts_sent, &priv->s_iowait); 595 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 596 } 597