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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause2/*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 else30 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 QP59 * @qp: a pointer to the QP60 * @ohdr: a pointer to the IB header being constructed61 * @ps: the xmit packet state62 *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 else94 /* 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 last106 * response has been sent instead of only being107 * constructed.108 */109 if (++next > rvt_size_atomic(&dev->rdi))110 next = 0;111 /*112 * Only advance the s_acked_ack_queue pointer if there113 * 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 and141 * we haven't seen the duplicate request yet,142 * then stop sending the remaining responses the143 * 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 to175 * wait for the actual request. All requests that are to176 * be resent will have their state set to177 * TID_REQUEST_RESEND. When the new request arrives, the178 * 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 and190 * we haven't seen the duplicate request yet,191 * then stop sending the remaining responses the192 * 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_flags256 * 4. If resources not available:257 * 4.1 Set RVT_S_WAIT_TID_SPACE258 * 4.2 Queue QP on RCD TID queue259 * 4.3 Put QP on iowait list.260 * 4.4 Build IB RNR NAK with appropriate timeout value261 * 4.5 Return indication progress made.262 * 5. If resources are available:263 * 5.1 Program HW flow CSRs264 * 5.2 Build TID RDMA WRITE RESP packet265 * 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 at275 * segment boundaries, not at request boundaries. Don't change276 * s_ack_state because we are still in the middle of a request277 */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_state319 * 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 sending332 * the ACK before setting s_ack_state to ACKNOWLEDGE333 * (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 else343 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 resetting370 * RVT_S_RESP_PENDING371 */372 smp_wmb();373 qp->s_flags &= ~(RVT_S_RESP_PENDING374 | RVT_S_ACK_PENDING375 | 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 QP382 * @ps: the current packet state383 *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 else421 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 else429 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 that479 * we don't reset the "furthest progress" state480 * 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 previous491 * RDMA read and atomic operations to finish.492 * However, there is no need to guard against493 * 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 immediately504 * after all prior requests have completed505 */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_ERR526 : 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 the537 * original work request since we may need to resend538 * 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 RDMA546 * 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 if654 * any of the following conditions about the WQE655 * to which s_ti_cur currently points to are656 * satisfied:657 * 1. The request is not a TID RDMA WRITE658 * request,659 * 2. The request is in the INACTIVE or660 * COMPLETE states (TID RDMA READ requests661 * stay at INACTIVE and TID RDMA WRITE662 * transition to COMPLETE when done),663 * 3. The request is in the ACTIVE or SYNC664 * state and the number of completed665 * segments is equal to the total segment666 * count.667 * (If ACTIVE, the request is waiting for668 * ACKs. If SYNC, the request has not669 * received any responses because it's670 * 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 WRITE690 * request was completed, s_tid_head,691 * s_tid_cur, and s_tid_tail all point to the692 * same location. Other requests are posted and693 * s_cur wraps around to the same location,694 * where a new TID RDMA WRITE is posted. In695 * this case, none of the indices need to be696 * 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 going713 * 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 started732 * 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 started769 * than the QP limits allow. We could get here under770 * three conditions; (1) It's a new request; (2) We are771 * 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 is774 * received just before this; (3) We are re-sending a775 * 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 TID787 * allocation. However, if the pages have been788 * walked and mapped, skip it. An earlier try789 * 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 started835 * 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 else893 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 the899 * last packet constructed for new requests and therefore900 * is never set to RDMA read response.901 * RDMA_READ_RESPONSE_FIRST is used by the ACK processing902 * thread to indicate a SEND needs to be restarted from an903 * 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 the944 * last packet constructed for new requests and therefore945 * is never set to RDMA read response.946 * RDMA_READ_RESPONSE_LAST is used by the ACK processing947 * thread to indicate a RDMA write needs to be restarted from948 * 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 the984 * last packet constructed for new requests and therefore985 * is never set to RDMA read response.986 * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing987 * thread to indicate a RDMA read needs to be restarted from988 * 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 RDMA1012 * WRITE request. See comment in OP(RDMA_READ_RESPONSE_MIDDLE1013 * 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 with1045 * which the request should be restart. It's OK to use division1046 * 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 the1052 * status to make sure that we find the flow. At the same1053 * time, we can use the req->state change to check if the1054 * 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 tid1061 * 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 start1096 * of a new request, we need to change the qp->s_state so that1097 * 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 else1105 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 try1173 * again. Set the flags to indicate which work item to wake1174 * 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 else1189 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, so1266 * we need to set the STL Verbs Extended bit here1267 */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_16B1335};1336 1337/*1338 * hfi1_send_rc_ack - Construct an ACK packet and send it1339 *1340 * This is called from hfi1_rc_rcv() and handle_receive_interrupt().1341 * Note that RDMA reads and atomics are handled in the1342 * 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. Pass1389 * responsibility for sending the ACK to the send engine1390 * 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_atomic1409 * @qp: the QP1410 * @psn: the packet sequence number to restart at1411 * @wqe: the wqe1412 *1413 * This is called from reset_psn() to update qp->s_num_rd_atomic1414 * 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 PSN1451 * @qp: the QP1452 * @psn: the packet sequence number to restart at1453 *1454 * This is called from hfi1_rc_rcv() to process an incoming RC ACK1455 * 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 only1541 * 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 timer1550 * 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 as1580 * they are not allowed to generate real user errors1581 */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 and1587 * remaining data as 0 to close out the1588 * current request1589 */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 else1620 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 ops1633 * 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 else1650 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 status1662 * @qp: the QP1663 * @opah: the opa header1664 *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 only1669 * send a single packet in the likely case the1670 * 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 the1720 * 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, where1734 * a new TID RDMA request is being started and all1735 * previous ones have been completed.1736 * Therefore, we need to do a secondary check in order1737 * to properly determine whether we should start the1738 * 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 else1746 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 and1755 * 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 else1766 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 this1778 * function is called. Therefore, add the timer only if TID1779 * 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 sure1822 * 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 a1833 * completion if the SWQE is being resent until the send1834 * 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 progress1851 * 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 is1868 * a TID RDMA WRITE request.1869 * Completion of the TID RDMA WRITE requests are done by the1870 * TID RDMA ACKs and as such could be for a request that has1871 * already been ACKed as far as the IB state machine is1872 * 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 of1879 * being resent, we can stop re-sending it since we know the1880 * 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 QP1922 * @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 upon1927 * receiving a TID WRITE RESP after the qp is scheduled to retry1928 * 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 current1938 * request, change the s_state so that the retry will be processed1939 * correctly. Similarly, if this is the last TID RDMA WRITE RESP1940 * 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 ACK1955 * @qp: the QP the ACK came in on1956 * @psn: the packet sequence number of the ACK1957 * @opcode: the opcode of the request that resulted in the ACK1958 *1959 * This is called from rc_rcv_resp() to process an incoming RC ACK1960 * 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 write1979 * requests and implicitly NAK RDMA read and atomic requests issued1980 * before the NAK'ed request. The MSN won't include the NAK'ed1981 * 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 so1991 * 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 since1996 * we want to generate completion events for everything1997 * before the RDMA read, copy the data, then generate1998 * 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 is2008 * for a later operation, this ACK NAKs the RDMA read or2009 * atomic. In other words, only a RDMA_READ_LAST or ONLY2010 * can ACK a RDMA read and likewise for atomic ops. Note2011 * that the NAK case can only happen if relaxed ordering is2012 * used and requests are sent after an RDMA read or atomic2013 * 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 are2027 * 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 RDMA2059 * 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 else2079 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 RDMA2088 * 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 correctly2094 * process all WQEs from s_acked onward and2095 * either complete them or check for correct2096 * PSN sequencing.2097 * However, for TID RDMA, due to pipelining,2098 * the response may not be for the request at2099 * s_acked so the above look would just be2100 * skipped. This does not allow for checking2101 * the PSN sequencing. It has to be done2102 * 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 the2110 * 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 else2120 rvt_stop_rc_timers(qp);2121 } else {2122 /*2123 * We are expecting more ACKs so2124 * mod the retry timer.2125 */2126 rvt_mod_retry_timer(qp);2127 /*2128 * We can stop re-sending the earlier packets2129 * and continue with the next packet the2130 * 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 the2152 * response is not a TID RDMA WRITE RESP packet, s_last_psn2153 * 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 WRITE2181 * request, s_last_psn should be incremented only when a TID2182 * RDMA WRITE RESP is received to avoid skipping lost TID RDMA2183 * 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 an2210 * RDMA READ response which terminates the RDMA2211 * 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 packet2296 * @packet: data packet information2297 *2298 * This is called from hfi1_rc_rcv() to process an incoming RC response2299 * 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 waiting2344 * 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 else2365 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, we2374 * have to be careful to copy the data to the right2375 * 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/o2408 * 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, we2429 * have to be careful to copy the data to the right2430 * 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 packet2496 * @ohdr: the other headers for this packet2497 * @data: the packet data2498 * @qp: the QP for this packet2499 * @opcode: the opcode for this packet2500 * @psn: the packet sequence number for this packet2501 * @diff: the difference between the PSN and the expected PSN2502 * @rcd: the receive context2503 *2504 * This is called from hfi1_rc_rcv() to process an unexpected2505 * incoming RC packet for the given QP.2506 * Called at interrupt level.2507 * Return 1 if no more processing is needed; otherwise return 0 to2508 * 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 packets2535 * 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, RDMA2545 * write or atomic op. Don't NAK errors, just silently drop2546 * the duplicate request. Note that r_sge, r_len, and2547 * r_rcv_len may be in use so don't modify them.2548 *2549 * We are supposed to ACK the earliest duplicate PSN but we2550 * can coalesce an outstanding duplicate ACK. We have to2551 * send the earliest so that RDMA reads can be restarted at2552 * the requester's expected PSN.2553 *2554 * First, find where this duplicate PSN falls within the2555 * ACKs previously sent.2556 * old_req is true if there is an older response that is scheduled2557 * 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 original2583 * request and start on pmtu boundaries.2584 * We reuse the old ack_queue slot since the requester2585 * should not back up and request an earlier PSN for the2586 * 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 queue2620 * or the send engine is already backed up to send an2621 * 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 ACK2634 * 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 is2640 * 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 which2651 * 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 timer2721 */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 else2735 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 packet2757 * @packet: data packet information2758 *2759 * This is called from qp_rcv() to process an incoming RC packet2760 * 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 the2796 * packet sequence number will be for something in the send work2797 * 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 new2844 * RDMA read or atomic operation before receiving an ACK2845 * 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 packets2869 * will come in with some padding since we always add2870 * CRC and LT bytes which will need to be flit aligned2871 */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 else2944 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 a2950 * work completion only for the UD transport (see section2951 * 11.4.2 of IBTA Vol. 1).2952 *2953 * However, the way the SL is chosen below is consistent2954 * with the way that IB/qib works and is trying avoid2955 * 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 later3048 * 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 we3063 * finish sending the result since a duplicate request would3064 * 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 sequence3235 * NAK until all packets3236 * in the receive queue have3237 * been processed.3238 * Otherwise, we end up3239 * propagating congestion.3240 */3241 rc_defered_ack(rcd, qp);3242 } /* Out of sequence NAK */3243 } /* QP Request NAKs */3244}3245