diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/rc.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/rc.c | 3244 |
1 files changed, 3244 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c new file mode 100644 index 000000000..acd2b273e --- /dev/null +++ b/drivers/infiniband/hw/hfi1/rc.c @@ -0,0 +1,3244 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause +/* + * Copyright(c) 2015 - 2018 Intel Corporation. + */ + +#include <linux/io.h> +#include <rdma/rdma_vt.h> +#include <rdma/rdmavt_qp.h> + +#include "hfi.h" +#include "qp.h" +#include "rc.h" +#include "verbs_txreq.h" +#include "trace.h" + +struct rvt_ack_entry *find_prev_entry(struct rvt_qp *qp, u32 psn, u8 *prev, + u8 *prev_ack, bool *scheduled) + __must_hold(&qp->s_lock) +{ + struct rvt_ack_entry *e = NULL; + u8 i, p; + bool s = true; + + for (i = qp->r_head_ack_queue; ; i = p) { + if (i == qp->s_tail_ack_queue) + s = false; + if (i) + p = i - 1; + else + p = rvt_size_atomic(ib_to_rvt(qp->ibqp.device)); + if (p == qp->r_head_ack_queue) { + e = NULL; + break; + } + e = &qp->s_ack_queue[p]; + if (!e->opcode) { + e = NULL; + break; + } + if (cmp_psn(psn, e->psn) >= 0) { + if (p == qp->s_tail_ack_queue && + cmp_psn(psn, e->lpsn) <= 0) + s = false; + break; + } + } + if (prev) + *prev = p; + if (prev_ack) + *prev_ack = i; + if (scheduled) + *scheduled = s; + return e; +} + +/** + * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) + * @dev: the device for this QP + * @qp: a pointer to the QP + * @ohdr: a pointer to the IB header being constructed + * @ps: the xmit packet state + * + * Return 1 if constructed; otherwise, return 0. + * Note that we are in the responder's side of the QP context. + * Note the QP s_lock must be held. + */ +static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp, + struct ib_other_headers *ohdr, + struct hfi1_pkt_state *ps) +{ + struct rvt_ack_entry *e; + u32 hwords, hdrlen; + u32 len = 0; + u32 bth0 = 0, bth2 = 0; + u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT); + int middle = 0; + u32 pmtu = qp->pmtu; + struct hfi1_qp_priv *qpriv = qp->priv; + bool last_pkt; + u32 delta; + u8 next = qp->s_tail_ack_queue; + struct tid_rdma_request *req; + + trace_hfi1_rsp_make_rc_ack(qp, 0); + lockdep_assert_held(&qp->s_lock); + /* Don't send an ACK if we aren't supposed to. */ + if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) + goto bail; + + if (qpriv->hdr_type == HFI1_PKT_TYPE_9B) + /* header size in 32-bit words LRH+BTH = (8+12)/4. */ + hwords = 5; + else + /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */ + hwords = 7; + + switch (qp->s_ack_state) { + case OP(RDMA_READ_RESPONSE_LAST): + case OP(RDMA_READ_RESPONSE_ONLY): + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + release_rdma_sge_mr(e); + fallthrough; + case OP(ATOMIC_ACKNOWLEDGE): + /* + * We can increment the tail pointer now that the last + * response has been sent instead of only being + * constructed. + */ + if (++next > rvt_size_atomic(&dev->rdi)) + next = 0; + /* + * Only advance the s_acked_ack_queue pointer if there + * have been no TID RDMA requests. + */ + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + if (e->opcode != TID_OP(WRITE_REQ) && + qp->s_acked_ack_queue == qp->s_tail_ack_queue) + qp->s_acked_ack_queue = next; + qp->s_tail_ack_queue = next; + trace_hfi1_rsp_make_rc_ack(qp, e->psn); + fallthrough; + case OP(SEND_ONLY): + case OP(ACKNOWLEDGE): + /* Check for no next entry in the queue. */ + if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { + if (qp->s_flags & RVT_S_ACK_PENDING) + goto normal; + goto bail; + } + + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + /* Check for tid write fence */ + if ((qpriv->s_flags & HFI1_R_TID_WAIT_INTERLCK) || + hfi1_tid_rdma_ack_interlock(qp, e)) { + iowait_set_flag(&qpriv->s_iowait, IOWAIT_PENDING_IB); + goto bail; + } + if (e->opcode == OP(RDMA_READ_REQUEST)) { + /* + * If a RDMA read response is being resent and + * we haven't seen the duplicate request yet, + * then stop sending the remaining responses the + * responder has seen until the requester re-sends it. + */ + len = e->rdma_sge.sge_length; + if (len && !e->rdma_sge.mr) { + if (qp->s_acked_ack_queue == + qp->s_tail_ack_queue) + qp->s_acked_ack_queue = + qp->r_head_ack_queue; + qp->s_tail_ack_queue = qp->r_head_ack_queue; + goto bail; + } + /* Copy SGE state in case we need to resend */ + ps->s_txreq->mr = e->rdma_sge.mr; + if (ps->s_txreq->mr) + rvt_get_mr(ps->s_txreq->mr); + qp->s_ack_rdma_sge.sge = e->rdma_sge; + qp->s_ack_rdma_sge.num_sge = 1; + ps->s_txreq->ss = &qp->s_ack_rdma_sge; + if (len > pmtu) { + len = pmtu; + qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); + } else { + qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); + e->sent = 1; + } + ohdr->u.aeth = rvt_compute_aeth(qp); + hwords++; + qp->s_ack_rdma_psn = e->psn; + bth2 = mask_psn(qp->s_ack_rdma_psn++); + } else if (e->opcode == TID_OP(WRITE_REQ)) { + /* + * If a TID RDMA WRITE RESP is being resent, we have to + * wait for the actual request. All requests that are to + * be resent will have their state set to + * TID_REQUEST_RESEND. When the new request arrives, the + * state will be changed to TID_REQUEST_RESEND_ACTIVE. + */ + req = ack_to_tid_req(e); + if (req->state == TID_REQUEST_RESEND || + req->state == TID_REQUEST_INIT_RESEND) + goto bail; + qp->s_ack_state = TID_OP(WRITE_RESP); + qp->s_ack_rdma_psn = mask_psn(e->psn + req->cur_seg); + goto write_resp; + } else if (e->opcode == TID_OP(READ_REQ)) { + /* + * If a TID RDMA read response is being resent and + * we haven't seen the duplicate request yet, + * then stop sending the remaining responses the + * responder has seen until the requester re-sends it. + */ + len = e->rdma_sge.sge_length; + if (len && !e->rdma_sge.mr) { + if (qp->s_acked_ack_queue == + qp->s_tail_ack_queue) + qp->s_acked_ack_queue = + qp->r_head_ack_queue; + qp->s_tail_ack_queue = qp->r_head_ack_queue; + goto bail; + } + /* Copy SGE state in case we need to resend */ + ps->s_txreq->mr = e->rdma_sge.mr; + if (ps->s_txreq->mr) + rvt_get_mr(ps->s_txreq->mr); + qp->s_ack_rdma_sge.sge = e->rdma_sge; + qp->s_ack_rdma_sge.num_sge = 1; + qp->s_ack_state = TID_OP(READ_RESP); + goto read_resp; + } else { + /* COMPARE_SWAP or FETCH_ADD */ + ps->s_txreq->ss = NULL; + len = 0; + qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); + ohdr->u.at.aeth = rvt_compute_aeth(qp); + ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth); + hwords += sizeof(ohdr->u.at) / sizeof(u32); + bth2 = mask_psn(e->psn); + e->sent = 1; + } + trace_hfi1_tid_write_rsp_make_rc_ack(qp); + bth0 = qp->s_ack_state << 24; + break; + + case OP(RDMA_READ_RESPONSE_FIRST): + qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); + fallthrough; + case OP(RDMA_READ_RESPONSE_MIDDLE): + ps->s_txreq->ss = &qp->s_ack_rdma_sge; + ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr; + if (ps->s_txreq->mr) + rvt_get_mr(ps->s_txreq->mr); + len = qp->s_ack_rdma_sge.sge.sge_length; + if (len > pmtu) { + len = pmtu; + middle = HFI1_CAP_IS_KSET(SDMA_AHG); + } else { + ohdr->u.aeth = rvt_compute_aeth(qp); + hwords++; + qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + e->sent = 1; + } + bth0 = qp->s_ack_state << 24; + bth2 = mask_psn(qp->s_ack_rdma_psn++); + break; + + case TID_OP(WRITE_RESP): +write_resp: + /* + * 1. Check if RVT_S_ACK_PENDING is set. If yes, + * goto normal. + * 2. Attempt to allocate TID resources. + * 3. Remove RVT_S_RESP_PENDING flags from s_flags + * 4. If resources not available: + * 4.1 Set RVT_S_WAIT_TID_SPACE + * 4.2 Queue QP on RCD TID queue + * 4.3 Put QP on iowait list. + * 4.4 Build IB RNR NAK with appropriate timeout value + * 4.5 Return indication progress made. + * 5. If resources are available: + * 5.1 Program HW flow CSRs + * 5.2 Build TID RDMA WRITE RESP packet + * 5.3 If more resources needed, do 2.1 - 2.3. + * 5.4 Wake up next QP on RCD TID queue. + * 5.5 Return indication progress made. + */ + + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + req = ack_to_tid_req(e); + + /* + * Send scheduled RNR NAK's. RNR NAK's need to be sent at + * segment boundaries, not at request boundaries. Don't change + * s_ack_state because we are still in the middle of a request + */ + if (qpriv->rnr_nak_state == TID_RNR_NAK_SEND && + qp->s_tail_ack_queue == qpriv->r_tid_alloc && + req->cur_seg == req->alloc_seg) { + qpriv->rnr_nak_state = TID_RNR_NAK_SENT; + goto normal_no_state; + } + + bth2 = mask_psn(qp->s_ack_rdma_psn); + hdrlen = hfi1_build_tid_rdma_write_resp(qp, e, ohdr, &bth1, + bth2, &len, + &ps->s_txreq->ss); + if (!hdrlen) + return 0; + + hwords += hdrlen; + bth0 = qp->s_ack_state << 24; + qp->s_ack_rdma_psn++; + trace_hfi1_tid_req_make_rc_ack_write(qp, 0, e->opcode, e->psn, + e->lpsn, req); + if (req->cur_seg != req->total_segs) + break; + + e->sent = 1; + /* Do not free e->rdma_sge until all data are received */ + qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); + break; + + case TID_OP(READ_RESP): +read_resp: + e = &qp->s_ack_queue[qp->s_tail_ack_queue]; + ps->s_txreq->ss = &qp->s_ack_rdma_sge; + delta = hfi1_build_tid_rdma_read_resp(qp, e, ohdr, &bth0, + &bth1, &bth2, &len, + &last_pkt); + if (delta == 0) + goto error_qp; + hwords += delta; + if (last_pkt) { + e->sent = 1; + /* + * Increment qp->s_tail_ack_queue through s_ack_state + * transition. + */ + qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); + } + break; + case TID_OP(READ_REQ): + goto bail; + + default: +normal: + /* + * Send a regular ACK. + * Set the s_ack_state so we wait until after sending + * the ACK before setting s_ack_state to ACKNOWLEDGE + * (see above). + */ + qp->s_ack_state = OP(SEND_ONLY); +normal_no_state: + if (qp->s_nak_state) + ohdr->u.aeth = + cpu_to_be32((qp->r_msn & IB_MSN_MASK) | + (qp->s_nak_state << + IB_AETH_CREDIT_SHIFT)); + else + ohdr->u.aeth = rvt_compute_aeth(qp); + hwords++; + len = 0; + bth0 = OP(ACKNOWLEDGE) << 24; + bth2 = mask_psn(qp->s_ack_psn); + qp->s_flags &= ~RVT_S_ACK_PENDING; + ps->s_txreq->txreq.flags |= SDMA_TXREQ_F_VIP; + ps->s_txreq->ss = NULL; + } + qp->s_rdma_ack_cnt++; + ps->s_txreq->sde = qpriv->s_sde; + ps->s_txreq->s_cur_size = len; + ps->s_txreq->hdr_dwords = hwords; + hfi1_make_ruc_header(qp, ohdr, bth0, bth1, bth2, middle, ps); + return 1; +error_qp: + spin_unlock_irqrestore(&qp->s_lock, ps->flags); + spin_lock_irqsave(&qp->r_lock, ps->flags); + spin_lock(&qp->s_lock); + rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); + spin_unlock(&qp->s_lock); + spin_unlock_irqrestore(&qp->r_lock, ps->flags); + spin_lock_irqsave(&qp->s_lock, ps->flags); +bail: + qp->s_ack_state = OP(ACKNOWLEDGE); + /* + * Ensure s_rdma_ack_cnt changes are committed prior to resetting + * RVT_S_RESP_PENDING + */ + smp_wmb(); + qp->s_flags &= ~(RVT_S_RESP_PENDING + | RVT_S_ACK_PENDING + | HFI1_S_AHG_VALID); + return 0; +} + +/** + * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) + * @qp: a pointer to the QP + * @ps: the current packet state + * + * Assumes s_lock is held. + * + * Return 1 if constructed; otherwise, return 0. + */ +int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct hfi1_ibdev *dev = to_idev(qp->ibqp.device); + struct ib_other_headers *ohdr; + struct rvt_sge_state *ss = NULL; + struct rvt_swqe *wqe; + struct hfi1_swqe_priv *wpriv; + struct tid_rdma_request *req = NULL; + /* header size in 32-bit words LRH+BTH = (8+12)/4. */ + u32 hwords = 5; + u32 len = 0; + u32 bth0 = 0, bth2 = 0; + u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT); + u32 pmtu = qp->pmtu; + char newreq; + int middle = 0; + int delta; + struct tid_rdma_flow *flow = NULL; + struct tid_rdma_params *remote; + + trace_hfi1_sender_make_rc_req(qp); + lockdep_assert_held(&qp->s_lock); + ps->s_txreq = get_txreq(ps->dev, qp); + if (!ps->s_txreq) + goto bail_no_tx; + + if (priv->hdr_type == HFI1_PKT_TYPE_9B) { + /* header size in 32-bit words LRH+BTH = (8+12)/4. */ + hwords = 5; + if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) + ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth; + else + ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth; + } else { + /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */ + hwords = 7; + if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && + (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr)))) + ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth; + else + ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth; + } + + /* Sending responses has higher priority over sending requests. */ + if ((qp->s_flags & RVT_S_RESP_PENDING) && + make_rc_ack(dev, qp, ohdr, ps)) + return 1; + + if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { + if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) + goto bail; + /* We are in the error state, flush the work request. */ + if (qp->s_last == READ_ONCE(qp->s_head)) + goto bail; + /* If DMAs are in progress, we can't flush immediately. */ + if (iowait_sdma_pending(&priv->s_iowait)) { + qp->s_flags |= RVT_S_WAIT_DMA; + goto bail; + } + clear_ahg(qp); + wqe = rvt_get_swqe_ptr(qp, qp->s_last); + hfi1_trdma_send_complete(qp, wqe, qp->s_last != qp->s_acked ? + IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR); + /* will get called again */ + goto done_free_tx; + } + + if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK | HFI1_S_WAIT_HALT)) + goto bail; + + if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) { + if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { + qp->s_flags |= RVT_S_WAIT_PSN; + goto bail; + } + qp->s_sending_psn = qp->s_psn; + qp->s_sending_hpsn = qp->s_psn - 1; + } + + /* Send a request. */ + wqe = rvt_get_swqe_ptr(qp, qp->s_cur); +check_s_state: + switch (qp->s_state) { + default: + if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) + goto bail; + /* + * Resend an old request or start a new one. + * + * We keep track of the current SWQE so that + * we don't reset the "furthest progress" state + * if we need to back up. + */ + newreq = 0; + if (qp->s_cur == qp->s_tail) { + /* Check if send work queue is empty. */ + if (qp->s_tail == READ_ONCE(qp->s_head)) { + clear_ahg(qp); + goto bail; + } + /* + * If a fence is requested, wait for previous + * RDMA read and atomic operations to finish. + * However, there is no need to guard against + * TID RDMA READ after TID RDMA READ. + */ + if ((wqe->wr.send_flags & IB_SEND_FENCE) && + qp->s_num_rd_atomic && + (wqe->wr.opcode != IB_WR_TID_RDMA_READ || + priv->pending_tid_r_segs < qp->s_num_rd_atomic)) { + qp->s_flags |= RVT_S_WAIT_FENCE; + goto bail; + } + /* + * Local operations are processed immediately + * after all prior requests have completed + */ + if (wqe->wr.opcode == IB_WR_REG_MR || + wqe->wr.opcode == IB_WR_LOCAL_INV) { + int local_ops = 0; + int err = 0; + + if (qp->s_last != qp->s_cur) + goto bail; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + if (++qp->s_tail == qp->s_size) + qp->s_tail = 0; + if (!(wqe->wr.send_flags & + RVT_SEND_COMPLETION_ONLY)) { + err = rvt_invalidate_rkey( + qp, + wqe->wr.ex.invalidate_rkey); + local_ops = 1; + } + rvt_send_complete(qp, wqe, + err ? IB_WC_LOC_PROT_ERR + : IB_WC_SUCCESS); + if (local_ops) + atomic_dec(&qp->local_ops_pending); + goto done_free_tx; + } + + newreq = 1; + qp->s_psn = wqe->psn; + } + /* + * Note that we have to be careful not to modify the + * original work request since we may need to resend + * it. + */ + len = wqe->length; + ss = &qp->s_sge; + bth2 = mask_psn(qp->s_psn); + + /* + * Interlock between various IB requests and TID RDMA + * if necessary. + */ + if ((priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) || + hfi1_tid_rdma_wqe_interlock(qp, wqe)) + goto bail; + + switch (wqe->wr.opcode) { + case IB_WR_SEND: + case IB_WR_SEND_WITH_IMM: + case IB_WR_SEND_WITH_INV: + /* If no credit, return. */ + if (!rvt_rc_credit_avail(qp, wqe)) + goto bail; + if (len > pmtu) { + qp->s_state = OP(SEND_FIRST); + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_SEND) { + qp->s_state = OP(SEND_ONLY); + } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { + qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + } else { + qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE); + /* Invalidate rkey comes after the BTH */ + ohdr->u.ieth = cpu_to_be32( + wqe->wr.ex.invalidate_rkey); + hwords += 1; + } + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + bth2 |= IB_BTH_REQ_ACK; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_RDMA_WRITE: + if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) + qp->s_lsn++; + goto no_flow_control; + case IB_WR_RDMA_WRITE_WITH_IMM: + /* If no credit, return. */ + if (!rvt_rc_credit_avail(qp, wqe)) + goto bail; +no_flow_control: + put_ib_reth_vaddr( + wqe->rdma_wr.remote_addr, + &ohdr->u.rc.reth); + ohdr->u.rc.reth.rkey = + cpu_to_be32(wqe->rdma_wr.rkey); + ohdr->u.rc.reth.length = cpu_to_be32(len); + hwords += sizeof(struct ib_reth) / sizeof(u32); + if (len > pmtu) { + qp->s_state = OP(RDMA_WRITE_FIRST); + len = pmtu; + break; + } + if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { + qp->s_state = OP(RDMA_WRITE_ONLY); + } else { + qp->s_state = + OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); + /* Immediate data comes after RETH */ + ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + } + bth2 |= IB_BTH_REQ_ACK; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_TID_RDMA_WRITE: + if (newreq) { + /* + * Limit the number of TID RDMA WRITE requests. + */ + if (atomic_read(&priv->n_tid_requests) >= + HFI1_TID_RDMA_WRITE_CNT) + goto bail; + + if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) + qp->s_lsn++; + } + + hwords += hfi1_build_tid_rdma_write_req(qp, wqe, ohdr, + &bth1, &bth2, + &len); + ss = NULL; + if (priv->s_tid_cur == HFI1_QP_WQE_INVALID) { + priv->s_tid_cur = qp->s_cur; + if (priv->s_tid_tail == HFI1_QP_WQE_INVALID) { + priv->s_tid_tail = qp->s_cur; + priv->s_state = TID_OP(WRITE_RESP); + } + } else if (priv->s_tid_cur == priv->s_tid_head) { + struct rvt_swqe *__w; + struct tid_rdma_request *__r; + + __w = rvt_get_swqe_ptr(qp, priv->s_tid_cur); + __r = wqe_to_tid_req(__w); + + /* + * The s_tid_cur pointer is advanced to s_cur if + * any of the following conditions about the WQE + * to which s_ti_cur currently points to are + * satisfied: + * 1. The request is not a TID RDMA WRITE + * request, + * 2. The request is in the INACTIVE or + * COMPLETE states (TID RDMA READ requests + * stay at INACTIVE and TID RDMA WRITE + * transition to COMPLETE when done), + * 3. The request is in the ACTIVE or SYNC + * state and the number of completed + * segments is equal to the total segment + * count. + * (If ACTIVE, the request is waiting for + * ACKs. If SYNC, the request has not + * received any responses because it's + * waiting on a sync point.) + */ + if (__w->wr.opcode != IB_WR_TID_RDMA_WRITE || + __r->state == TID_REQUEST_INACTIVE || + __r->state == TID_REQUEST_COMPLETE || + ((__r->state == TID_REQUEST_ACTIVE || + __r->state == TID_REQUEST_SYNC) && + __r->comp_seg == __r->total_segs)) { + if (priv->s_tid_tail == + priv->s_tid_cur && + priv->s_state == + TID_OP(WRITE_DATA_LAST)) { + priv->s_tid_tail = qp->s_cur; + priv->s_state = + TID_OP(WRITE_RESP); + } + priv->s_tid_cur = qp->s_cur; + } + /* + * A corner case: when the last TID RDMA WRITE + * request was completed, s_tid_head, + * s_tid_cur, and s_tid_tail all point to the + * same location. Other requests are posted and + * s_cur wraps around to the same location, + * where a new TID RDMA WRITE is posted. In + * this case, none of the indices need to be + * updated. However, the priv->s_state should. + */ + if (priv->s_tid_tail == qp->s_cur && + priv->s_state == TID_OP(WRITE_DATA_LAST)) + priv->s_state = TID_OP(WRITE_RESP); + } + req = wqe_to_tid_req(wqe); + if (newreq) { + priv->s_tid_head = qp->s_cur; + priv->pending_tid_w_resp += req->total_segs; + atomic_inc(&priv->n_tid_requests); + atomic_dec(&priv->n_requests); + } else { + req->state = TID_REQUEST_RESEND; + req->comp_seg = delta_psn(bth2, wqe->psn); + /* + * Pull back any segments since we are going + * to re-receive them. + */ + req->setup_head = req->clear_tail; + priv->pending_tid_w_resp += + delta_psn(wqe->lpsn, bth2) + 1; + } + + trace_hfi1_tid_write_sender_make_req(qp, newreq); + trace_hfi1_tid_req_make_req_write(qp, newreq, + wqe->wr.opcode, + wqe->psn, wqe->lpsn, + req); + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_RDMA_READ: + /* + * Don't allow more operations to be started + * than the QP limits allow. + */ + if (qp->s_num_rd_atomic >= + qp->s_max_rd_atomic) { + qp->s_flags |= RVT_S_WAIT_RDMAR; + goto bail; + } + qp->s_num_rd_atomic++; + if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) + qp->s_lsn++; + put_ib_reth_vaddr( + wqe->rdma_wr.remote_addr, + &ohdr->u.rc.reth); + ohdr->u.rc.reth.rkey = + cpu_to_be32(wqe->rdma_wr.rkey); + ohdr->u.rc.reth.length = cpu_to_be32(len); + qp->s_state = OP(RDMA_READ_REQUEST); + hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); + ss = NULL; + len = 0; + bth2 |= IB_BTH_REQ_ACK; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_TID_RDMA_READ: + trace_hfi1_tid_read_sender_make_req(qp, newreq); + wpriv = wqe->priv; + req = wqe_to_tid_req(wqe); + trace_hfi1_tid_req_make_req_read(qp, newreq, + wqe->wr.opcode, + wqe->psn, wqe->lpsn, + req); + delta = cmp_psn(qp->s_psn, wqe->psn); + + /* + * Don't allow more operations to be started + * than the QP limits allow. We could get here under + * three conditions; (1) It's a new request; (2) We are + * sending the second or later segment of a request, + * but the qp->s_state is set to OP(RDMA_READ_REQUEST) + * when the last segment of a previous request is + * received just before this; (3) We are re-sending a + * request. + */ + if (qp->s_num_rd_atomic >= qp->s_max_rd_atomic) { + qp->s_flags |= RVT_S_WAIT_RDMAR; + goto bail; + } + if (newreq) { + struct tid_rdma_flow *flow = + &req->flows[req->setup_head]; + + /* + * Set up s_sge as it is needed for TID + * allocation. However, if the pages have been + * walked and mapped, skip it. An earlier try + * has failed to allocate the TID entries. + */ + if (!flow->npagesets) { + qp->s_sge.sge = wqe->sg_list[0]; + qp->s_sge.sg_list = wqe->sg_list + 1; + qp->s_sge.num_sge = wqe->wr.num_sge; + qp->s_sge.total_len = wqe->length; + qp->s_len = wqe->length; + req->isge = 0; + req->clear_tail = req->setup_head; + req->flow_idx = req->setup_head; + req->state = TID_REQUEST_ACTIVE; + } + } else if (delta == 0) { + /* Re-send a request */ + req->cur_seg = 0; + req->comp_seg = 0; + req->ack_pending = 0; + req->flow_idx = req->clear_tail; + req->state = TID_REQUEST_RESEND; + } + req->s_next_psn = qp->s_psn; + /* Read one segment at a time */ + len = min_t(u32, req->seg_len, + wqe->length - req->seg_len * req->cur_seg); + delta = hfi1_build_tid_rdma_read_req(qp, wqe, ohdr, + &bth1, &bth2, + &len); + if (delta <= 0) { + /* Wait for TID space */ + goto bail; + } + if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) + qp->s_lsn++; + hwords += delta; + ss = &wpriv->ss; + /* Check if this is the last segment */ + if (req->cur_seg >= req->total_segs && + ++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case IB_WR_ATOMIC_CMP_AND_SWP: + case IB_WR_ATOMIC_FETCH_AND_ADD: + /* + * Don't allow more operations to be started + * than the QP limits allow. + */ + if (qp->s_num_rd_atomic >= + qp->s_max_rd_atomic) { + qp->s_flags |= RVT_S_WAIT_RDMAR; + goto bail; + } + qp->s_num_rd_atomic++; + fallthrough; + case IB_WR_OPFN: + if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) + qp->s_lsn++; + if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || + wqe->wr.opcode == IB_WR_OPFN) { + qp->s_state = OP(COMPARE_SWAP); + put_ib_ateth_swap(wqe->atomic_wr.swap, + &ohdr->u.atomic_eth); + put_ib_ateth_compare(wqe->atomic_wr.compare_add, + &ohdr->u.atomic_eth); + } else { + qp->s_state = OP(FETCH_ADD); + put_ib_ateth_swap(wqe->atomic_wr.compare_add, + &ohdr->u.atomic_eth); + put_ib_ateth_compare(0, &ohdr->u.atomic_eth); + } + put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr, + &ohdr->u.atomic_eth); + ohdr->u.atomic_eth.rkey = cpu_to_be32( + wqe->atomic_wr.rkey); + hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); + ss = NULL; + len = 0; + bth2 |= IB_BTH_REQ_ACK; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + default: + goto bail; + } + if (wqe->wr.opcode != IB_WR_TID_RDMA_READ) { + qp->s_sge.sge = wqe->sg_list[0]; + qp->s_sge.sg_list = wqe->sg_list + 1; + qp->s_sge.num_sge = wqe->wr.num_sge; + qp->s_sge.total_len = wqe->length; + qp->s_len = wqe->length; + } + if (newreq) { + qp->s_tail++; + if (qp->s_tail >= qp->s_size) + qp->s_tail = 0; + } + if (wqe->wr.opcode == IB_WR_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) + qp->s_psn = wqe->lpsn + 1; + else if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) + qp->s_psn = req->s_next_psn; + else + qp->s_psn++; + break; + + case OP(RDMA_READ_RESPONSE_FIRST): + /* + * qp->s_state is normally set to the opcode of the + * last packet constructed for new requests and therefore + * is never set to RDMA read response. + * RDMA_READ_RESPONSE_FIRST is used by the ACK processing + * thread to indicate a SEND needs to be restarted from an + * earlier PSN without interfering with the sending thread. + * See restart_rc(). + */ + qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); + fallthrough; + case OP(SEND_FIRST): + qp->s_state = OP(SEND_MIDDLE); + fallthrough; + case OP(SEND_MIDDLE): + bth2 = mask_psn(qp->s_psn++); + ss = &qp->s_sge; + len = qp->s_len; + if (len > pmtu) { + len = pmtu; + middle = HFI1_CAP_IS_KSET(SDMA_AHG); + break; + } + if (wqe->wr.opcode == IB_WR_SEND) { + qp->s_state = OP(SEND_LAST); + } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { + qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + } else { + qp->s_state = OP(SEND_LAST_WITH_INVALIDATE); + /* invalidate data comes after the BTH */ + ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey); + hwords += 1; + } + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + bth2 |= IB_BTH_REQ_ACK; + qp->s_cur++; + if (qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + + case OP(RDMA_READ_RESPONSE_LAST): + /* + * qp->s_state is normally set to the opcode of the + * last packet constructed for new requests and therefore + * is never set to RDMA read response. + * RDMA_READ_RESPONSE_LAST is used by the ACK processing + * thread to indicate a RDMA write needs to be restarted from + * an earlier PSN without interfering with the sending thread. + * See restart_rc(). + */ + qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); + fallthrough; + case OP(RDMA_WRITE_FIRST): + qp->s_state = OP(RDMA_WRITE_MIDDLE); + fallthrough; + case OP(RDMA_WRITE_MIDDLE): + bth2 = mask_psn(qp->s_psn++); + ss = &qp->s_sge; + len = qp->s_len; + if (len > pmtu) { + len = pmtu; + middle = HFI1_CAP_IS_KSET(SDMA_AHG); + break; + } + if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { + qp->s_state = OP(RDMA_WRITE_LAST); + } else { + qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); + /* Immediate data comes after the BTH */ + ohdr->u.imm_data = wqe->wr.ex.imm_data; + hwords += 1; + if (wqe->wr.send_flags & IB_SEND_SOLICITED) + bth0 |= IB_BTH_SOLICITED; + } + bth2 |= IB_BTH_REQ_ACK; + qp->s_cur++; + if (qp->s_cur >= qp->s_size) + qp->s_cur = 0; + break; + + case OP(RDMA_READ_RESPONSE_MIDDLE): + /* + * qp->s_state is normally set to the opcode of the + * last packet constructed for new requests and therefore + * is never set to RDMA read response. + * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing + * thread to indicate a RDMA read needs to be restarted from + * an earlier PSN without interfering with the sending thread. + * See restart_rc(). + */ + len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu; + put_ib_reth_vaddr( + wqe->rdma_wr.remote_addr + len, + &ohdr->u.rc.reth); + ohdr->u.rc.reth.rkey = + cpu_to_be32(wqe->rdma_wr.rkey); + ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); + qp->s_state = OP(RDMA_READ_REQUEST); + hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); + bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK; + qp->s_psn = wqe->lpsn + 1; + ss = NULL; + len = 0; + qp->s_cur++; + if (qp->s_cur == qp->s_size) + qp->s_cur = 0; + break; + + case TID_OP(WRITE_RESP): + /* + * This value for s_state is used for restarting a TID RDMA + * WRITE request. See comment in OP(RDMA_READ_RESPONSE_MIDDLE + * for more). + */ + req = wqe_to_tid_req(wqe); + req->state = TID_REQUEST_RESEND; + rcu_read_lock(); + remote = rcu_dereference(priv->tid_rdma.remote); + req->comp_seg = delta_psn(qp->s_psn, wqe->psn); + len = wqe->length - (req->comp_seg * remote->max_len); + rcu_read_unlock(); + + bth2 = mask_psn(qp->s_psn); + hwords += hfi1_build_tid_rdma_write_req(qp, wqe, ohdr, &bth1, + &bth2, &len); + qp->s_psn = wqe->lpsn + 1; + ss = NULL; + qp->s_state = TID_OP(WRITE_REQ); + priv->pending_tid_w_resp += delta_psn(wqe->lpsn, bth2) + 1; + priv->s_tid_cur = qp->s_cur; + if (++qp->s_cur == qp->s_size) + qp->s_cur = 0; + trace_hfi1_tid_req_make_req_write(qp, 0, wqe->wr.opcode, + wqe->psn, wqe->lpsn, req); + break; + + case TID_OP(READ_RESP): + if (wqe->wr.opcode != IB_WR_TID_RDMA_READ) + goto bail; + /* This is used to restart a TID read request */ + req = wqe_to_tid_req(wqe); + wpriv = wqe->priv; + /* + * Back down. The field qp->s_psn has been set to the psn with + * which the request should be restart. It's OK to use division + * as this is on the retry path. + */ + req->cur_seg = delta_psn(qp->s_psn, wqe->psn) / priv->pkts_ps; + + /* + * The following function need to be redefined to return the + * status to make sure that we find the flow. At the same + * time, we can use the req->state change to check if the + * call succeeds or not. + */ + req->state = TID_REQUEST_RESEND; + hfi1_tid_rdma_restart_req(qp, wqe, &bth2); + if (req->state != TID_REQUEST_ACTIVE) { + /* + * Failed to find the flow. Release all allocated tid + * resources. + */ + hfi1_kern_exp_rcv_clear_all(req); + hfi1_kern_clear_hw_flow(priv->rcd, qp); + + hfi1_trdma_send_complete(qp, wqe, IB_WC_LOC_QP_OP_ERR); + goto bail; + } + req->state = TID_REQUEST_RESEND; + len = min_t(u32, req->seg_len, + wqe->length - req->seg_len * req->cur_seg); + flow = &req->flows[req->flow_idx]; + len -= flow->sent; + req->s_next_psn = flow->flow_state.ib_lpsn + 1; + delta = hfi1_build_tid_rdma_read_packet(wqe, ohdr, &bth1, + &bth2, &len); + if (delta <= 0) { + /* Wait for TID space */ + goto bail; + } + hwords += delta; + ss = &wpriv->ss; + /* Check if this is the last segment */ + if (req->cur_seg >= req->total_segs && + ++qp->s_cur == qp->s_size) + qp->s_cur = 0; + qp->s_psn = req->s_next_psn; + trace_hfi1_tid_req_make_req_read(qp, 0, wqe->wr.opcode, + wqe->psn, wqe->lpsn, req); + break; + case TID_OP(READ_REQ): + req = wqe_to_tid_req(wqe); + delta = cmp_psn(qp->s_psn, wqe->psn); + /* + * If the current WR is not TID RDMA READ, or this is the start + * of a new request, we need to change the qp->s_state so that + * the request can be set up properly. + */ + if (wqe->wr.opcode != IB_WR_TID_RDMA_READ || delta == 0 || + qp->s_cur == qp->s_tail) { + qp->s_state = OP(RDMA_READ_REQUEST); + if (delta == 0 || qp->s_cur == qp->s_tail) + goto check_s_state; + else + goto bail; + } + + /* Rate limiting */ + if (qp->s_num_rd_atomic >= qp->s_max_rd_atomic) { + qp->s_flags |= RVT_S_WAIT_RDMAR; + goto bail; + } + + wpriv = wqe->priv; + /* Read one segment at a time */ + len = min_t(u32, req->seg_len, + wqe->length - req->seg_len * req->cur_seg); + delta = hfi1_build_tid_rdma_read_req(qp, wqe, ohdr, &bth1, + &bth2, &len); + if (delta <= 0) { + /* Wait for TID space */ + goto bail; + } + hwords += delta; + ss = &wpriv->ss; + /* Check if this is the last segment */ + if (req->cur_seg >= req->total_segs && + ++qp->s_cur == qp->s_size) + qp->s_cur = 0; + qp->s_psn = req->s_next_psn; + trace_hfi1_tid_req_make_req_read(qp, 0, wqe->wr.opcode, + wqe->psn, wqe->lpsn, req); + break; + } + qp->s_sending_hpsn = bth2; + delta = delta_psn(bth2, wqe->psn); + if (delta && delta % HFI1_PSN_CREDIT == 0 && + wqe->wr.opcode != IB_WR_TID_RDMA_WRITE) + bth2 |= IB_BTH_REQ_ACK; + if (qp->s_flags & RVT_S_SEND_ONE) { + qp->s_flags &= ~RVT_S_SEND_ONE; + qp->s_flags |= RVT_S_WAIT_ACK; + bth2 |= IB_BTH_REQ_ACK; + } + qp->s_len -= len; + ps->s_txreq->hdr_dwords = hwords; + ps->s_txreq->sde = priv->s_sde; + ps->s_txreq->ss = ss; + ps->s_txreq->s_cur_size = len; + hfi1_make_ruc_header( + qp, + ohdr, + bth0 | (qp->s_state << 24), + bth1, + bth2, + middle, + ps); + return 1; + +done_free_tx: + hfi1_put_txreq(ps->s_txreq); + ps->s_txreq = NULL; + return 1; + +bail: + hfi1_put_txreq(ps->s_txreq); + +bail_no_tx: + ps->s_txreq = NULL; + qp->s_flags &= ~RVT_S_BUSY; + /* + * If we didn't get a txreq, the QP will be woken up later to try + * again. Set the flags to indicate which work item to wake + * up. + */ + iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB); + return 0; +} + +static inline void hfi1_make_bth_aeth(struct rvt_qp *qp, + struct ib_other_headers *ohdr, + u32 bth0, u32 bth1) +{ + if (qp->r_nak_state) + ohdr->u.aeth = cpu_to_be32((qp->r_msn & IB_MSN_MASK) | + (qp->r_nak_state << + IB_AETH_CREDIT_SHIFT)); + else + ohdr->u.aeth = rvt_compute_aeth(qp); + + ohdr->bth[0] = cpu_to_be32(bth0); + ohdr->bth[1] = cpu_to_be32(bth1 | qp->remote_qpn); + ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn)); +} + +static inline void hfi1_queue_rc_ack(struct hfi1_packet *packet, bool is_fecn) +{ + struct rvt_qp *qp = packet->qp; + struct hfi1_ibport *ibp; + unsigned long flags; + + spin_lock_irqsave(&qp->s_lock, flags); + if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) + goto unlock; + ibp = rcd_to_iport(packet->rcd); + this_cpu_inc(*ibp->rvp.rc_qacks); + qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING; + qp->s_nak_state = qp->r_nak_state; + qp->s_ack_psn = qp->r_ack_psn; + if (is_fecn) + qp->s_flags |= RVT_S_ECN; + + /* Schedule the send tasklet. */ + hfi1_schedule_send(qp); +unlock: + spin_unlock_irqrestore(&qp->s_lock, flags); +} + +static inline void hfi1_make_rc_ack_9B(struct hfi1_packet *packet, + struct hfi1_opa_header *opa_hdr, + u8 sc5, bool is_fecn, + u64 *pbc_flags, u32 *hwords, + u32 *nwords) +{ + struct rvt_qp *qp = packet->qp; + struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + struct ib_header *hdr = &opa_hdr->ibh; + struct ib_other_headers *ohdr; + u16 lrh0 = HFI1_LRH_BTH; + u16 pkey; + u32 bth0, bth1; + + opa_hdr->hdr_type = HFI1_PKT_TYPE_9B; + ohdr = &hdr->u.oth; + /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */ + *hwords = 6; + + if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { + *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh, + rdma_ah_read_grh(&qp->remote_ah_attr), + *hwords - 2, SIZE_OF_CRC); + ohdr = &hdr->u.l.oth; + lrh0 = HFI1_LRH_GRH; + } + /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */ + *pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT); + + /* read pkey_index w/o lock (its atomic) */ + pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); + + lrh0 |= (sc5 & IB_SC_MASK) << IB_SC_SHIFT | + (rdma_ah_get_sl(&qp->remote_ah_attr) & IB_SL_MASK) << + IB_SL_SHIFT; + + hfi1_make_ib_hdr(hdr, lrh0, *hwords + SIZE_OF_CRC, + opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), + ppd->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr)); + + bth0 = pkey | (OP(ACKNOWLEDGE) << 24); + if (qp->s_mig_state == IB_MIG_MIGRATED) + bth0 |= IB_BTH_MIG_REQ; + bth1 = (!!is_fecn) << IB_BECN_SHIFT; + /* + * Inline ACKs go out without the use of the Verbs send engine, so + * we need to set the STL Verbs Extended bit here + */ + bth1 |= HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT; + hfi1_make_bth_aeth(qp, ohdr, bth0, bth1); +} + +static inline void hfi1_make_rc_ack_16B(struct hfi1_packet *packet, + struct hfi1_opa_header *opa_hdr, + u8 sc5, bool is_fecn, + u64 *pbc_flags, u32 *hwords, + u32 *nwords) +{ + struct rvt_qp *qp = packet->qp; + struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + struct hfi1_16b_header *hdr = &opa_hdr->opah; + struct ib_other_headers *ohdr; + u32 bth0, bth1 = 0; + u16 len, pkey; + bool becn = is_fecn; + u8 l4 = OPA_16B_L4_IB_LOCAL; + u8 extra_bytes; + + opa_hdr->hdr_type = HFI1_PKT_TYPE_16B; + ohdr = &hdr->u.oth; + /* header size in 32-bit words 16B LRH+BTH+AETH = (16+12+4)/4 */ + *hwords = 8; + extra_bytes = hfi1_get_16b_padding(*hwords << 2, 0); + *nwords = SIZE_OF_CRC + ((extra_bytes + SIZE_OF_LT) >> 2); + + if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && + hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { + *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh, + rdma_ah_read_grh(&qp->remote_ah_attr), + *hwords - 4, *nwords); + ohdr = &hdr->u.l.oth; + l4 = OPA_16B_L4_IB_GLOBAL; + } + *pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC; + + /* read pkey_index w/o lock (its atomic) */ + pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); + + /* Convert dwords to flits */ + len = (*hwords + *nwords) >> 1; + + hfi1_make_16b_hdr(hdr, ppd->lid | + (rdma_ah_get_path_bits(&qp->remote_ah_attr) & + ((1 << ppd->lmc) - 1)), + opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), + 16B), len, pkey, becn, 0, l4, sc5); + + bth0 = pkey | (OP(ACKNOWLEDGE) << 24); + bth0 |= extra_bytes << 20; + if (qp->s_mig_state == IB_MIG_MIGRATED) + bth1 = OPA_BTH_MIG_REQ; + hfi1_make_bth_aeth(qp, ohdr, bth0, bth1); +} + +typedef void (*hfi1_make_rc_ack)(struct hfi1_packet *packet, + struct hfi1_opa_header *opa_hdr, + u8 sc5, bool is_fecn, + u64 *pbc_flags, u32 *hwords, + u32 *nwords); + +/* We support only two types - 9B and 16B for now */ +static const hfi1_make_rc_ack hfi1_make_rc_ack_tbl[2] = { + [HFI1_PKT_TYPE_9B] = &hfi1_make_rc_ack_9B, + [HFI1_PKT_TYPE_16B] = &hfi1_make_rc_ack_16B +}; + +/* + * hfi1_send_rc_ack - Construct an ACK packet and send it + * + * This is called from hfi1_rc_rcv() and handle_receive_interrupt(). + * Note that RDMA reads and atomics are handled in the + * send side QP state and send engine. + */ +void hfi1_send_rc_ack(struct hfi1_packet *packet, bool is_fecn) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + struct rvt_qp *qp = packet->qp; + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + struct hfi1_qp_priv *priv = qp->priv; + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)]; + u64 pbc, pbc_flags = 0; + u32 hwords = 0; + u32 nwords = 0; + u32 plen; + struct pio_buf *pbuf; + struct hfi1_opa_header opa_hdr; + + /* clear the defer count */ + qp->r_adefered = 0; + + /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ + if (qp->s_flags & RVT_S_RESP_PENDING) { + hfi1_queue_rc_ack(packet, is_fecn); + return; + } + + /* Ensure s_rdma_ack_cnt changes are committed */ + if (qp->s_rdma_ack_cnt) { + hfi1_queue_rc_ack(packet, is_fecn); + return; + } + + /* Don't try to send ACKs if the link isn't ACTIVE */ + if (driver_lstate(ppd) != IB_PORT_ACTIVE) + return; + + /* Make the appropriate header */ + hfi1_make_rc_ack_tbl[priv->hdr_type](packet, &opa_hdr, sc5, is_fecn, + &pbc_flags, &hwords, &nwords); + + plen = 2 /* PBC */ + hwords + nwords; + pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, + sc_to_vlt(ppd->dd, sc5), plen); + pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL); + if (IS_ERR_OR_NULL(pbuf)) { + /* + * We have no room to send at the moment. Pass + * responsibility for sending the ACK to the send engine + * so that when enough buffer space becomes available, + * the ACK is sent ahead of other outgoing packets. + */ + hfi1_queue_rc_ack(packet, is_fecn); + return; + } + trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device), + &opa_hdr, ib_is_sc5(sc5)); + + /* write the pbc and data */ + ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, + (priv->hdr_type == HFI1_PKT_TYPE_9B ? + (void *)&opa_hdr.ibh : + (void *)&opa_hdr.opah), hwords); + return; +} + +/** + * update_num_rd_atomic - update the qp->s_num_rd_atomic + * @qp: the QP + * @psn: the packet sequence number to restart at + * @wqe: the wqe + * + * This is called from reset_psn() to update qp->s_num_rd_atomic + * for the current wqe. + * Called at interrupt level with the QP s_lock held. + */ +static void update_num_rd_atomic(struct rvt_qp *qp, u32 psn, + struct rvt_swqe *wqe) +{ + u32 opcode = wqe->wr.opcode; + + if (opcode == IB_WR_RDMA_READ || + opcode == IB_WR_ATOMIC_CMP_AND_SWP || + opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { + qp->s_num_rd_atomic++; + } else if (opcode == IB_WR_TID_RDMA_READ) { + struct tid_rdma_request *req = wqe_to_tid_req(wqe); + struct hfi1_qp_priv *priv = qp->priv; + + if (cmp_psn(psn, wqe->lpsn) <= 0) { + u32 cur_seg; + + cur_seg = (psn - wqe->psn) / priv->pkts_ps; + req->ack_pending = cur_seg - req->comp_seg; + priv->pending_tid_r_segs += req->ack_pending; + qp->s_num_rd_atomic += req->ack_pending; + trace_hfi1_tid_req_update_num_rd_atomic(qp, 0, + wqe->wr.opcode, + wqe->psn, + wqe->lpsn, + req); + } else { + priv->pending_tid_r_segs += req->total_segs; + qp->s_num_rd_atomic += req->total_segs; + } + } +} + +/** + * reset_psn - reset the QP state to send starting from PSN + * @qp: the QP + * @psn: the packet sequence number to restart at + * + * This is called from hfi1_rc_rcv() to process an incoming RC ACK + * for the given QP. + * Called at interrupt level with the QP s_lock held. + */ +static void reset_psn(struct rvt_qp *qp, u32 psn) +{ + u32 n = qp->s_acked; + struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n); + u32 opcode; + struct hfi1_qp_priv *priv = qp->priv; + + lockdep_assert_held(&qp->s_lock); + qp->s_cur = n; + priv->pending_tid_r_segs = 0; + priv->pending_tid_w_resp = 0; + qp->s_num_rd_atomic = 0; + + /* + * If we are starting the request from the beginning, + * let the normal send code handle initialization. + */ + if (cmp_psn(psn, wqe->psn) <= 0) { + qp->s_state = OP(SEND_LAST); + goto done; + } + update_num_rd_atomic(qp, psn, wqe); + + /* Find the work request opcode corresponding to the given PSN. */ + for (;;) { + int diff; + + if (++n == qp->s_size) + n = 0; + if (n == qp->s_tail) + break; + wqe = rvt_get_swqe_ptr(qp, n); + diff = cmp_psn(psn, wqe->psn); + if (diff < 0) { + /* Point wqe back to the previous one*/ + wqe = rvt_get_swqe_ptr(qp, qp->s_cur); + break; + } + qp->s_cur = n; + /* + * If we are starting the request from the beginning, + * let the normal send code handle initialization. + */ + if (diff == 0) { + qp->s_state = OP(SEND_LAST); + goto done; + } + + update_num_rd_atomic(qp, psn, wqe); + } + opcode = wqe->wr.opcode; + + /* + * Set the state to restart in the middle of a request. + * Don't change the s_sge, s_cur_sge, or s_cur_size. + * See hfi1_make_rc_req(). + */ + switch (opcode) { + case IB_WR_SEND: + case IB_WR_SEND_WITH_IMM: + qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); + break; + + case IB_WR_RDMA_WRITE: + case IB_WR_RDMA_WRITE_WITH_IMM: + qp->s_state = OP(RDMA_READ_RESPONSE_LAST); + break; + + case IB_WR_TID_RDMA_WRITE: + qp->s_state = TID_OP(WRITE_RESP); + break; + + case IB_WR_RDMA_READ: + qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); + break; + + case IB_WR_TID_RDMA_READ: + qp->s_state = TID_OP(READ_RESP); + break; + + default: + /* + * This case shouldn't happen since its only + * one PSN per req. + */ + qp->s_state = OP(SEND_LAST); + } +done: + priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK; + qp->s_psn = psn; + /* + * Set RVT_S_WAIT_PSN as rc_complete() may start the timer + * asynchronously before the send engine can get scheduled. + * Doing it in hfi1_make_rc_req() is too late. + */ + if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) && + (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) + qp->s_flags |= RVT_S_WAIT_PSN; + qp->s_flags &= ~HFI1_S_AHG_VALID; + trace_hfi1_sender_reset_psn(qp); +} + +/* + * Back up requester to resend the last un-ACKed request. + * The QP r_lock and s_lock should be held and interrupts disabled. + */ +void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + struct hfi1_ibport *ibp; + + lockdep_assert_held(&qp->r_lock); + lockdep_assert_held(&qp->s_lock); + trace_hfi1_sender_restart_rc(qp); + if (qp->s_retry == 0) { + if (qp->s_mig_state == IB_MIG_ARMED) { + hfi1_migrate_qp(qp); + qp->s_retry = qp->s_retry_cnt; + } else if (qp->s_last == qp->s_acked) { + /* + * We need special handling for the OPFN request WQEs as + * they are not allowed to generate real user errors + */ + if (wqe->wr.opcode == IB_WR_OPFN) { + struct hfi1_ibport *ibp = + to_iport(qp->ibqp.device, qp->port_num); + /* + * Call opfn_conn_reply() with capcode and + * remaining data as 0 to close out the + * current request + */ + opfn_conn_reply(qp, priv->opfn.curr); + wqe = do_rc_completion(qp, wqe, ibp); + qp->s_flags &= ~RVT_S_WAIT_ACK; + } else { + trace_hfi1_tid_write_sender_restart_rc(qp, 0); + if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) { + struct tid_rdma_request *req; + + req = wqe_to_tid_req(wqe); + hfi1_kern_exp_rcv_clear_all(req); + hfi1_kern_clear_hw_flow(priv->rcd, qp); + } + + hfi1_trdma_send_complete(qp, wqe, + IB_WC_RETRY_EXC_ERR); + rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); + } + return; + } else { /* need to handle delayed completion */ + return; + } + } else { + qp->s_retry--; + } + + ibp = to_iport(qp->ibqp.device, qp->port_num); + if (wqe->wr.opcode == IB_WR_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_READ) + ibp->rvp.n_rc_resends++; + else + ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); + + qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | + RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN | + RVT_S_WAIT_ACK | HFI1_S_WAIT_TID_RESP); + if (wait) + qp->s_flags |= RVT_S_SEND_ONE; + reset_psn(qp, psn); +} + +/* + * Set qp->s_sending_psn to the next PSN after the given one. + * This would be psn+1 except when RDMA reads or TID RDMA ops + * are present. + */ +static void reset_sending_psn(struct rvt_qp *qp, u32 psn) +{ + struct rvt_swqe *wqe; + u32 n = qp->s_last; + + lockdep_assert_held(&qp->s_lock); + /* Find the work request corresponding to the given PSN. */ + for (;;) { + wqe = rvt_get_swqe_ptr(qp, n); + if (cmp_psn(psn, wqe->lpsn) <= 0) { + if (wqe->wr.opcode == IB_WR_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) + qp->s_sending_psn = wqe->lpsn + 1; + else + qp->s_sending_psn = psn + 1; + break; + } + if (++n == qp->s_size) + n = 0; + if (n == qp->s_tail) + break; + } +} + +/** + * hfi1_rc_verbs_aborted - handle abort status + * @qp: the QP + * @opah: the opa header + * + * This code modifies both ACK bit in BTH[2] + * and the s_flags to go into send one mode. + * + * This serves to throttle the send engine to only + * send a single packet in the likely case the + * a link has gone down. + */ +void hfi1_rc_verbs_aborted(struct rvt_qp *qp, struct hfi1_opa_header *opah) +{ + struct ib_other_headers *ohdr = hfi1_get_rc_ohdr(opah); + u8 opcode = ib_bth_get_opcode(ohdr); + u32 psn; + + /* ignore responses */ + if ((opcode >= OP(RDMA_READ_RESPONSE_FIRST) && + opcode <= OP(ATOMIC_ACKNOWLEDGE)) || + opcode == TID_OP(READ_RESP) || + opcode == TID_OP(WRITE_RESP)) + return; + + psn = ib_bth_get_psn(ohdr) | IB_BTH_REQ_ACK; + ohdr->bth[2] = cpu_to_be32(psn); + qp->s_flags |= RVT_S_SEND_ONE; +} + +/* + * This should be called with the QP s_lock held and interrupts disabled. + */ +void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah) +{ + struct ib_other_headers *ohdr; + struct hfi1_qp_priv *priv = qp->priv; + struct rvt_swqe *wqe; + u32 opcode, head, tail; + u32 psn; + struct tid_rdma_request *req; + + lockdep_assert_held(&qp->s_lock); + if (!(ib_rvt_state_ops[qp->state] & RVT_SEND_OR_FLUSH_OR_RECV_OK)) + return; + + ohdr = hfi1_get_rc_ohdr(opah); + opcode = ib_bth_get_opcode(ohdr); + if ((opcode >= OP(RDMA_READ_RESPONSE_FIRST) && + opcode <= OP(ATOMIC_ACKNOWLEDGE)) || + opcode == TID_OP(READ_RESP) || + opcode == TID_OP(WRITE_RESP)) { + WARN_ON(!qp->s_rdma_ack_cnt); + qp->s_rdma_ack_cnt--; + return; + } + + psn = ib_bth_get_psn(ohdr); + /* + * Don't attempt to reset the sending PSN for packets in the + * KDETH PSN space since the PSN does not match anything. + */ + if (opcode != TID_OP(WRITE_DATA) && + opcode != TID_OP(WRITE_DATA_LAST) && + opcode != TID_OP(ACK) && opcode != TID_OP(RESYNC)) + reset_sending_psn(qp, psn); + + /* Handle TID RDMA WRITE packets differently */ + if (opcode >= TID_OP(WRITE_REQ) && + opcode <= TID_OP(WRITE_DATA_LAST)) { + head = priv->s_tid_head; + tail = priv->s_tid_cur; + /* + * s_tid_cur is set to s_tid_head in the case, where + * a new TID RDMA request is being started and all + * previous ones have been completed. + * Therefore, we need to do a secondary check in order + * to properly determine whether we should start the + * RC timer. + */ + wqe = rvt_get_swqe_ptr(qp, tail); + req = wqe_to_tid_req(wqe); + if (head == tail && req->comp_seg < req->total_segs) { + if (tail == 0) + tail = qp->s_size - 1; + else + tail -= 1; + } + } else { + head = qp->s_tail; + tail = qp->s_acked; + } + + /* + * Start timer after a packet requesting an ACK has been sent and + * there are still requests that haven't been acked. + */ + if ((psn & IB_BTH_REQ_ACK) && tail != head && + opcode != TID_OP(WRITE_DATA) && opcode != TID_OP(WRITE_DATA_LAST) && + opcode != TID_OP(RESYNC) && + !(qp->s_flags & + (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) && + (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { + if (opcode == TID_OP(READ_REQ)) + rvt_add_retry_timer_ext(qp, priv->timeout_shift); + else + rvt_add_retry_timer(qp); + } + + /* Start TID RDMA ACK timer */ + if ((opcode == TID_OP(WRITE_DATA) || + opcode == TID_OP(WRITE_DATA_LAST) || + opcode == TID_OP(RESYNC)) && + (psn & IB_BTH_REQ_ACK) && + !(priv->s_flags & HFI1_S_TID_RETRY_TIMER) && + (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { + /* + * The TID RDMA ACK packet could be received before this + * function is called. Therefore, add the timer only if TID + * RDMA ACK packets are actually pending. + */ + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + req = wqe_to_tid_req(wqe); + if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE && + req->ack_seg < req->cur_seg) + hfi1_add_tid_retry_timer(qp); + } + + while (qp->s_last != qp->s_acked) { + wqe = rvt_get_swqe_ptr(qp, qp->s_last); + if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 && + cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) + break; + trdma_clean_swqe(qp, wqe); + trace_hfi1_qp_send_completion(qp, wqe, qp->s_last); + rvt_qp_complete_swqe(qp, + wqe, + ib_hfi1_wc_opcode[wqe->wr.opcode], + IB_WC_SUCCESS); + } + /* + * If we were waiting for sends to complete before re-sending, + * and they are now complete, restart sending. + */ + trace_hfi1_sendcomplete(qp, psn); + if (qp->s_flags & RVT_S_WAIT_PSN && + cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { + qp->s_flags &= ~RVT_S_WAIT_PSN; + qp->s_sending_psn = qp->s_psn; + qp->s_sending_hpsn = qp->s_psn - 1; + hfi1_schedule_send(qp); + } +} + +static inline void update_last_psn(struct rvt_qp *qp, u32 psn) +{ + qp->s_last_psn = psn; +} + +/* + * Generate a SWQE completion. + * This is similar to hfi1_send_complete but has to check to be sure + * that the SGEs are not being referenced if the SWQE is being resent. + */ +struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, + struct rvt_swqe *wqe, + struct hfi1_ibport *ibp) +{ + struct hfi1_qp_priv *priv = qp->priv; + + lockdep_assert_held(&qp->s_lock); + /* + * Don't decrement refcount and don't generate a + * completion if the SWQE is being resent until the send + * is finished. + */ + trace_hfi1_rc_completion(qp, wqe->lpsn); + if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 || + cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { + trdma_clean_swqe(qp, wqe); + trace_hfi1_qp_send_completion(qp, wqe, qp->s_last); + rvt_qp_complete_swqe(qp, + wqe, + ib_hfi1_wc_opcode[wqe->wr.opcode], + IB_WC_SUCCESS); + } else { + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + + this_cpu_inc(*ibp->rvp.rc_delayed_comp); + /* + * If send progress not running attempt to progress + * SDMA queue. + */ + if (ppd->dd->flags & HFI1_HAS_SEND_DMA) { + struct sdma_engine *engine; + u8 sl = rdma_ah_get_sl(&qp->remote_ah_attr); + u8 sc5; + + /* For now use sc to find engine */ + sc5 = ibp->sl_to_sc[sl]; + engine = qp_to_sdma_engine(qp, sc5); + sdma_engine_progress_schedule(engine); + } + } + + qp->s_retry = qp->s_retry_cnt; + /* + * Don't update the last PSN if the request being completed is + * a TID RDMA WRITE request. + * Completion of the TID RDMA WRITE requests are done by the + * TID RDMA ACKs and as such could be for a request that has + * already been ACKed as far as the IB state machine is + * concerned. + */ + if (wqe->wr.opcode != IB_WR_TID_RDMA_WRITE) + update_last_psn(qp, wqe->lpsn); + + /* + * If we are completing a request which is in the process of + * being resent, we can stop re-sending it since we know the + * responder has already seen it. + */ + if (qp->s_acked == qp->s_cur) { + if (++qp->s_cur >= qp->s_size) + qp->s_cur = 0; + qp->s_acked = qp->s_cur; + wqe = rvt_get_swqe_ptr(qp, qp->s_cur); + if (qp->s_acked != qp->s_tail) { + qp->s_state = OP(SEND_LAST); + qp->s_psn = wqe->psn; + } + } else { + if (++qp->s_acked >= qp->s_size) + qp->s_acked = 0; + if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) + qp->s_draining = 0; + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + } + if (priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) { + priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK; + hfi1_schedule_send(qp); + } + return wqe; +} + +static void set_restart_qp(struct rvt_qp *qp, struct hfi1_ctxtdata *rcd) +{ + /* Retry this request. */ + if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) { + qp->r_flags |= RVT_R_RDMAR_SEQ; + hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); + if (list_empty(&qp->rspwait)) { + qp->r_flags |= RVT_R_RSP_SEND; + rvt_get_qp(qp); + list_add_tail(&qp->rspwait, &rcd->qp_wait_list); + } + } +} + +/** + * update_qp_retry_state - Update qp retry state. + * @qp: the QP + * @psn: the packet sequence number of the TID RDMA WRITE RESP. + * @spsn: The start psn for the given TID RDMA WRITE swqe. + * @lpsn: The last psn for the given TID RDMA WRITE swqe. + * + * This function is called to update the qp retry state upon + * receiving a TID WRITE RESP after the qp is scheduled to retry + * a request. + */ +static void update_qp_retry_state(struct rvt_qp *qp, u32 psn, u32 spsn, + u32 lpsn) +{ + struct hfi1_qp_priv *qpriv = qp->priv; + + qp->s_psn = psn + 1; + /* + * If this is the first TID RDMA WRITE RESP packet for the current + * request, change the s_state so that the retry will be processed + * correctly. Similarly, if this is the last TID RDMA WRITE RESP + * packet, change the s_state and advance the s_cur. + */ + if (cmp_psn(psn, lpsn) >= 0) { + qp->s_cur = qpriv->s_tid_cur + 1; + if (qp->s_cur >= qp->s_size) + qp->s_cur = 0; + qp->s_state = TID_OP(WRITE_REQ); + } else if (!cmp_psn(psn, spsn)) { + qp->s_cur = qpriv->s_tid_cur; + qp->s_state = TID_OP(WRITE_RESP); + } +} + +/* + * do_rc_ack - process an incoming RC ACK + * @qp: the QP the ACK came in on + * @psn: the packet sequence number of the ACK + * @opcode: the opcode of the request that resulted in the ACK + * + * This is called from rc_rcv_resp() to process an incoming RC ACK + * for the given QP. + * May be called at interrupt level, with the QP s_lock held. + * Returns 1 if OK, 0 if current operation should be aborted (NAK). + */ +int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode, + u64 val, struct hfi1_ctxtdata *rcd) +{ + struct hfi1_ibport *ibp; + enum ib_wc_status status; + struct hfi1_qp_priv *qpriv = qp->priv; + struct rvt_swqe *wqe; + int ret = 0; + u32 ack_psn; + int diff; + struct rvt_dev_info *rdi; + + lockdep_assert_held(&qp->s_lock); + /* + * Note that NAKs implicitly ACK outstanding SEND and RDMA write + * requests and implicitly NAK RDMA read and atomic requests issued + * before the NAK'ed request. The MSN won't include the NAK'ed + * request but will include an ACK'ed request(s). + */ + ack_psn = psn; + if (aeth >> IB_AETH_NAK_SHIFT) + ack_psn--; + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + ibp = rcd_to_iport(rcd); + + /* + * The MSN might be for a later WQE than the PSN indicates so + * only complete WQEs that the PSN finishes. + */ + while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) { + /* + * RDMA_READ_RESPONSE_ONLY is a special case since + * we want to generate completion events for everything + * before the RDMA read, copy the data, then generate + * the completion for the read. + */ + if (wqe->wr.opcode == IB_WR_RDMA_READ && + opcode == OP(RDMA_READ_RESPONSE_ONLY) && + diff == 0) { + ret = 1; + goto bail_stop; + } + /* + * If this request is a RDMA read or atomic, and the ACK is + * for a later operation, this ACK NAKs the RDMA read or + * atomic. In other words, only a RDMA_READ_LAST or ONLY + * can ACK a RDMA read and likewise for atomic ops. Note + * that the NAK case can only happen if relaxed ordering is + * used and requests are sent after an RDMA read or atomic + * is sent but before the response is received. + */ + if ((wqe->wr.opcode == IB_WR_RDMA_READ && + (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || + (wqe->wr.opcode == IB_WR_TID_RDMA_READ && + (opcode != TID_OP(READ_RESP) || diff != 0)) || + ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || + wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && + (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0)) || + (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE && + (delta_psn(psn, qp->s_last_psn) != 1))) { + set_restart_qp(qp, rcd); + /* + * No need to process the ACK/NAK since we are + * restarting an earlier request. + */ + goto bail_stop; + } + if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || + wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { + u64 *vaddr = wqe->sg_list[0].vaddr; + *vaddr = val; + } + if (wqe->wr.opcode == IB_WR_OPFN) + opfn_conn_reply(qp, val); + + if (qp->s_num_rd_atomic && + (wqe->wr.opcode == IB_WR_RDMA_READ || + wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || + wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { + qp->s_num_rd_atomic--; + /* Restart sending task if fence is complete */ + if ((qp->s_flags & RVT_S_WAIT_FENCE) && + !qp->s_num_rd_atomic) { + qp->s_flags &= ~(RVT_S_WAIT_FENCE | + RVT_S_WAIT_ACK); + hfi1_schedule_send(qp); + } else if (qp->s_flags & RVT_S_WAIT_RDMAR) { + qp->s_flags &= ~(RVT_S_WAIT_RDMAR | + RVT_S_WAIT_ACK); + hfi1_schedule_send(qp); + } + } + + /* + * TID RDMA WRITE requests will be completed by the TID RDMA + * ACK packet handler (see tid_rdma.c). + */ + if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) + break; + + wqe = do_rc_completion(qp, wqe, ibp); + if (qp->s_acked == qp->s_tail) + break; + } + + trace_hfi1_rc_ack_do(qp, aeth, psn, wqe); + trace_hfi1_sender_do_rc_ack(qp); + switch (aeth >> IB_AETH_NAK_SHIFT) { + case 0: /* ACK */ + this_cpu_inc(*ibp->rvp.rc_acks); + if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) { + if (wqe_to_tid_req(wqe)->ack_pending) + rvt_mod_retry_timer_ext(qp, + qpriv->timeout_shift); + else + rvt_stop_rc_timers(qp); + } else if (qp->s_acked != qp->s_tail) { + struct rvt_swqe *__w = NULL; + + if (qpriv->s_tid_cur != HFI1_QP_WQE_INVALID) + __w = rvt_get_swqe_ptr(qp, qpriv->s_tid_cur); + + /* + * Stop timers if we've received all of the TID RDMA + * WRITE * responses. + */ + if (__w && __w->wr.opcode == IB_WR_TID_RDMA_WRITE && + opcode == TID_OP(WRITE_RESP)) { + /* + * Normally, the loop above would correctly + * process all WQEs from s_acked onward and + * either complete them or check for correct + * PSN sequencing. + * However, for TID RDMA, due to pipelining, + * the response may not be for the request at + * s_acked so the above look would just be + * skipped. This does not allow for checking + * the PSN sequencing. It has to be done + * separately. + */ + if (cmp_psn(psn, qp->s_last_psn + 1)) { + set_restart_qp(qp, rcd); + goto bail_stop; + } + /* + * If the psn is being resent, stop the + * resending. + */ + if (qp->s_cur != qp->s_tail && + cmp_psn(qp->s_psn, psn) <= 0) + update_qp_retry_state(qp, psn, + __w->psn, + __w->lpsn); + else if (--qpriv->pending_tid_w_resp) + rvt_mod_retry_timer(qp); + else + rvt_stop_rc_timers(qp); + } else { + /* + * We are expecting more ACKs so + * mod the retry timer. + */ + rvt_mod_retry_timer(qp); + /* + * We can stop re-sending the earlier packets + * and continue with the next packet the + * receiver wants. + */ + if (cmp_psn(qp->s_psn, psn) <= 0) + reset_psn(qp, psn + 1); + } + } else { + /* No more acks - kill all timers */ + rvt_stop_rc_timers(qp); + if (cmp_psn(qp->s_psn, psn) <= 0) { + qp->s_state = OP(SEND_LAST); + qp->s_psn = psn + 1; + } + } + if (qp->s_flags & RVT_S_WAIT_ACK) { + qp->s_flags &= ~RVT_S_WAIT_ACK; + hfi1_schedule_send(qp); + } + rvt_get_credit(qp, aeth); + qp->s_rnr_retry = qp->s_rnr_retry_cnt; + qp->s_retry = qp->s_retry_cnt; + /* + * If the current request is a TID RDMA WRITE request and the + * response is not a TID RDMA WRITE RESP packet, s_last_psn + * can't be advanced. + */ + if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE && + opcode != TID_OP(WRITE_RESP) && + cmp_psn(psn, wqe->psn) >= 0) + return 1; + update_last_psn(qp, psn); + return 1; + + case 1: /* RNR NAK */ + ibp->rvp.n_rnr_naks++; + if (qp->s_acked == qp->s_tail) + goto bail_stop; + if (qp->s_flags & RVT_S_WAIT_RNR) + goto bail_stop; + rdi = ib_to_rvt(qp->ibqp.device); + if (!(rdi->post_parms[wqe->wr.opcode].flags & + RVT_OPERATION_IGN_RNR_CNT)) { + if (qp->s_rnr_retry == 0) { + status = IB_WC_RNR_RETRY_EXC_ERR; + goto class_b; + } + if (qp->s_rnr_retry_cnt < 7 && qp->s_rnr_retry_cnt > 0) + qp->s_rnr_retry--; + } + + /* + * The last valid PSN is the previous PSN. For TID RDMA WRITE + * request, s_last_psn should be incremented only when a TID + * RDMA WRITE RESP is received to avoid skipping lost TID RDMA + * WRITE RESP packets. + */ + if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) { + reset_psn(qp, qp->s_last_psn + 1); + } else { + update_last_psn(qp, psn - 1); + reset_psn(qp, psn); + } + + ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); + qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK); + rvt_stop_rc_timers(qp); + rvt_add_rnr_timer(qp, aeth); + return 0; + + case 3: /* NAK */ + if (qp->s_acked == qp->s_tail) + goto bail_stop; + /* The last valid PSN is the previous PSN. */ + update_last_psn(qp, psn - 1); + switch ((aeth >> IB_AETH_CREDIT_SHIFT) & + IB_AETH_CREDIT_MASK) { + case 0: /* PSN sequence error */ + ibp->rvp.n_seq_naks++; + /* + * Back up to the responder's expected PSN. + * Note that we might get a NAK in the middle of an + * RDMA READ response which terminates the RDMA + * READ. + */ + hfi1_restart_rc(qp, psn, 0); + hfi1_schedule_send(qp); + break; + + case 1: /* Invalid Request */ + status = IB_WC_REM_INV_REQ_ERR; + ibp->rvp.n_other_naks++; + goto class_b; + + case 2: /* Remote Access Error */ + status = IB_WC_REM_ACCESS_ERR; + ibp->rvp.n_other_naks++; + goto class_b; + + case 3: /* Remote Operation Error */ + status = IB_WC_REM_OP_ERR; + ibp->rvp.n_other_naks++; +class_b: + if (qp->s_last == qp->s_acked) { + if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) + hfi1_kern_read_tid_flow_free(qp); + + hfi1_trdma_send_complete(qp, wqe, status); + rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); + } + break; + + default: + /* Ignore other reserved NAK error codes */ + goto reserved; + } + qp->s_retry = qp->s_retry_cnt; + qp->s_rnr_retry = qp->s_rnr_retry_cnt; + goto bail_stop; + + default: /* 2: reserved */ +reserved: + /* Ignore reserved NAK codes. */ + goto bail_stop; + } + /* cannot be reached */ +bail_stop: + rvt_stop_rc_timers(qp); + return ret; +} + +/* + * We have seen an out of sequence RDMA read middle or last packet. + * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. + */ +static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn, + struct hfi1_ctxtdata *rcd) +{ + struct rvt_swqe *wqe; + + lockdep_assert_held(&qp->s_lock); + /* Remove QP from retry timer */ + rvt_stop_rc_timers(qp); + + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + + while (cmp_psn(psn, wqe->lpsn) > 0) { + if (wqe->wr.opcode == IB_WR_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_READ || + wqe->wr.opcode == IB_WR_TID_RDMA_WRITE || + wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || + wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) + break; + wqe = do_rc_completion(qp, wqe, ibp); + } + + ibp->rvp.n_rdma_seq++; + qp->r_flags |= RVT_R_RDMAR_SEQ; + hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); + if (list_empty(&qp->rspwait)) { + qp->r_flags |= RVT_R_RSP_SEND; + rvt_get_qp(qp); + list_add_tail(&qp->rspwait, &rcd->qp_wait_list); + } +} + +/** + * rc_rcv_resp - process an incoming RC response packet + * @packet: data packet information + * + * This is called from hfi1_rc_rcv() to process an incoming RC response + * packet for the given QP. + * Called at interrupt level. + */ +static void rc_rcv_resp(struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + void *data = packet->payload; + u32 tlen = packet->tlen; + struct rvt_qp *qp = packet->qp; + struct hfi1_ibport *ibp; + struct ib_other_headers *ohdr = packet->ohdr; + struct rvt_swqe *wqe; + enum ib_wc_status status; + unsigned long flags; + int diff; + u64 val; + u32 aeth; + u32 psn = ib_bth_get_psn(packet->ohdr); + u32 pmtu = qp->pmtu; + u16 hdrsize = packet->hlen; + u8 opcode = packet->opcode; + u8 pad = packet->pad; + u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); + + spin_lock_irqsave(&qp->s_lock, flags); + trace_hfi1_ack(qp, psn); + + /* Ignore invalid responses. */ + if (cmp_psn(psn, READ_ONCE(qp->s_next_psn)) >= 0) + goto ack_done; + + /* Ignore duplicate responses. */ + diff = cmp_psn(psn, qp->s_last_psn); + if (unlikely(diff <= 0)) { + /* Update credits for "ghost" ACKs */ + if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { + aeth = be32_to_cpu(ohdr->u.aeth); + if ((aeth >> IB_AETH_NAK_SHIFT) == 0) + rvt_get_credit(qp, aeth); + } + goto ack_done; + } + + /* + * Skip everything other than the PSN we expect, if we are waiting + * for a reply to a restarted RDMA read or atomic op. + */ + if (qp->r_flags & RVT_R_RDMAR_SEQ) { + if (cmp_psn(psn, qp->s_last_psn + 1) != 0) + goto ack_done; + qp->r_flags &= ~RVT_R_RDMAR_SEQ; + } + + if (unlikely(qp->s_acked == qp->s_tail)) + goto ack_done; + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + status = IB_WC_SUCCESS; + + switch (opcode) { + case OP(ACKNOWLEDGE): + case OP(ATOMIC_ACKNOWLEDGE): + case OP(RDMA_READ_RESPONSE_FIRST): + aeth = be32_to_cpu(ohdr->u.aeth); + if (opcode == OP(ATOMIC_ACKNOWLEDGE)) + val = ib_u64_get(&ohdr->u.at.atomic_ack_eth); + else + val = 0; + if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || + opcode != OP(RDMA_READ_RESPONSE_FIRST)) + goto ack_done; + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) + goto ack_op_err; + /* + * If this is a response to a resent RDMA read, we + * have to be careful to copy the data to the right + * location. + */ + qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, + wqe, psn, pmtu); + goto read_middle; + + case OP(RDMA_READ_RESPONSE_MIDDLE): + /* no AETH, no ACK */ + if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) + goto ack_seq_err; + if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) + goto ack_op_err; +read_middle: + if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) + goto ack_len_err; + if (unlikely(pmtu >= qp->s_rdma_read_len)) + goto ack_len_err; + + /* + * We got a response so update the timeout. + * 4.096 usec. * (1 << qp->timeout) + */ + rvt_mod_retry_timer(qp); + if (qp->s_flags & RVT_S_WAIT_ACK) { + qp->s_flags &= ~RVT_S_WAIT_ACK; + hfi1_schedule_send(qp); + } + + if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) + qp->s_retry = qp->s_retry_cnt; + + /* + * Update the RDMA receive state but do the copy w/o + * holding the locks and blocking interrupts. + */ + qp->s_rdma_read_len -= pmtu; + update_last_psn(qp, psn); + spin_unlock_irqrestore(&qp->s_lock, flags); + rvt_copy_sge(qp, &qp->s_rdma_read_sge, + data, pmtu, false, false); + goto bail; + + case OP(RDMA_READ_RESPONSE_ONLY): + aeth = be32_to_cpu(ohdr->u.aeth); + if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) + goto ack_done; + /* + * Check that the data size is >= 0 && <= pmtu. + * Remember to account for ICRC (4). + */ + if (unlikely(tlen < (hdrsize + extra_bytes))) + goto ack_len_err; + /* + * If this is a response to a resent RDMA read, we + * have to be careful to copy the data to the right + * location. + */ + wqe = rvt_get_swqe_ptr(qp, qp->s_acked); + qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, + wqe, psn, pmtu); + goto read_last; + + case OP(RDMA_READ_RESPONSE_LAST): + /* ACKs READ req. */ + if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) + goto ack_seq_err; + if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) + goto ack_op_err; + /* + * Check that the data size is >= 1 && <= pmtu. + * Remember to account for ICRC (4). + */ + if (unlikely(tlen <= (hdrsize + extra_bytes))) + goto ack_len_err; +read_last: + tlen -= hdrsize + extra_bytes; + if (unlikely(tlen != qp->s_rdma_read_len)) + goto ack_len_err; + aeth = be32_to_cpu(ohdr->u.aeth); + rvt_copy_sge(qp, &qp->s_rdma_read_sge, + data, tlen, false, false); + WARN_ON(qp->s_rdma_read_sge.num_sge); + (void)do_rc_ack(qp, aeth, psn, + OP(RDMA_READ_RESPONSE_LAST), 0, rcd); + goto ack_done; + } + +ack_op_err: + status = IB_WC_LOC_QP_OP_ERR; + goto ack_err; + +ack_seq_err: + ibp = rcd_to_iport(rcd); + rdma_seq_err(qp, ibp, psn, rcd); + goto ack_done; + +ack_len_err: + status = IB_WC_LOC_LEN_ERR; +ack_err: + if (qp->s_last == qp->s_acked) { + rvt_send_complete(qp, wqe, status); + rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); + } +ack_done: + spin_unlock_irqrestore(&qp->s_lock, flags); +bail: + return; +} + +static inline void rc_cancel_ack(struct rvt_qp *qp) +{ + qp->r_adefered = 0; + if (list_empty(&qp->rspwait)) + return; + list_del_init(&qp->rspwait); + qp->r_flags &= ~RVT_R_RSP_NAK; + rvt_put_qp(qp); +} + +/** + * rc_rcv_error - process an incoming duplicate or error RC packet + * @ohdr: the other headers for this packet + * @data: the packet data + * @qp: the QP for this packet + * @opcode: the opcode for this packet + * @psn: the packet sequence number for this packet + * @diff: the difference between the PSN and the expected PSN + * @rcd: the receive context + * + * This is called from hfi1_rc_rcv() to process an unexpected + * incoming RC packet for the given QP. + * Called at interrupt level. + * Return 1 if no more processing is needed; otherwise return 0 to + * schedule a response to be sent. + */ +static noinline int rc_rcv_error(struct ib_other_headers *ohdr, void *data, + struct rvt_qp *qp, u32 opcode, u32 psn, + int diff, struct hfi1_ctxtdata *rcd) +{ + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + struct rvt_ack_entry *e; + unsigned long flags; + u8 prev; + u8 mra; /* most recent ACK */ + bool old_req; + + trace_hfi1_rcv_error(qp, psn); + if (diff > 0) { + /* + * Packet sequence error. + * A NAK will ACK earlier sends and RDMA writes. + * Don't queue the NAK if we already sent one. + */ + if (!qp->r_nak_state) { + ibp->rvp.n_rc_seqnak++; + qp->r_nak_state = IB_NAK_PSN_ERROR; + /* Use the expected PSN. */ + qp->r_ack_psn = qp->r_psn; + /* + * Wait to send the sequence NAK until all packets + * in the receive queue have been processed. + * Otherwise, we end up propagating congestion. + */ + rc_defered_ack(rcd, qp); + } + goto done; + } + + /* + * Handle a duplicate request. Don't re-execute SEND, RDMA + * write or atomic op. Don't NAK errors, just silently drop + * the duplicate request. Note that r_sge, r_len, and + * r_rcv_len may be in use so don't modify them. + * + * We are supposed to ACK the earliest duplicate PSN but we + * can coalesce an outstanding duplicate ACK. We have to + * send the earliest so that RDMA reads can be restarted at + * the requester's expected PSN. + * + * First, find where this duplicate PSN falls within the + * ACKs previously sent. + * old_req is true if there is an older response that is scheduled + * to be sent before sending this one. + */ + e = NULL; + old_req = true; + ibp->rvp.n_rc_dupreq++; + + spin_lock_irqsave(&qp->s_lock, flags); + + e = find_prev_entry(qp, psn, &prev, &mra, &old_req); + + switch (opcode) { + case OP(RDMA_READ_REQUEST): { + struct ib_reth *reth; + u32 offset; + u32 len; + + /* + * If we didn't find the RDMA read request in the ack queue, + * we can ignore this request. + */ + if (!e || e->opcode != OP(RDMA_READ_REQUEST)) + goto unlock_done; + /* RETH comes after BTH */ + reth = &ohdr->u.rc.reth; + /* + * Address range must be a subset of the original + * request and start on pmtu boundaries. + * We reuse the old ack_queue slot since the requester + * should not back up and request an earlier PSN for the + * same request. + */ + offset = delta_psn(psn, e->psn) * qp->pmtu; + len = be32_to_cpu(reth->length); + if (unlikely(offset + len != e->rdma_sge.sge_length)) + goto unlock_done; + release_rdma_sge_mr(e); + if (len != 0) { + u32 rkey = be32_to_cpu(reth->rkey); + u64 vaddr = get_ib_reth_vaddr(reth); + int ok; + + ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, + IB_ACCESS_REMOTE_READ); + if (unlikely(!ok)) + goto unlock_done; + } else { + e->rdma_sge.vaddr = NULL; + e->rdma_sge.length = 0; + e->rdma_sge.sge_length = 0; + } + e->psn = psn; + if (old_req) + goto unlock_done; + if (qp->s_acked_ack_queue == qp->s_tail_ack_queue) + qp->s_acked_ack_queue = prev; + qp->s_tail_ack_queue = prev; + break; + } + + case OP(COMPARE_SWAP): + case OP(FETCH_ADD): { + /* + * If we didn't find the atomic request in the ack queue + * or the send engine is already backed up to send an + * earlier entry, we can ignore this request. + */ + if (!e || e->opcode != (u8)opcode || old_req) + goto unlock_done; + if (qp->s_tail_ack_queue == qp->s_acked_ack_queue) + qp->s_acked_ack_queue = prev; + qp->s_tail_ack_queue = prev; + break; + } + + default: + /* + * Ignore this operation if it doesn't request an ACK + * or an earlier RDMA read or atomic is going to be resent. + */ + if (!(psn & IB_BTH_REQ_ACK) || old_req) + goto unlock_done; + /* + * Resend the most recent ACK if this request is + * after all the previous RDMA reads and atomics. + */ + if (mra == qp->r_head_ack_queue) { + spin_unlock_irqrestore(&qp->s_lock, flags); + qp->r_nak_state = 0; + qp->r_ack_psn = qp->r_psn - 1; + goto send_ack; + } + + /* + * Resend the RDMA read or atomic op which + * ACKs this duplicate request. + */ + if (qp->s_tail_ack_queue == qp->s_acked_ack_queue) + qp->s_acked_ack_queue = mra; + qp->s_tail_ack_queue = mra; + break; + } + qp->s_ack_state = OP(ACKNOWLEDGE); + qp->s_flags |= RVT_S_RESP_PENDING; + qp->r_nak_state = 0; + hfi1_schedule_send(qp); + +unlock_done: + spin_unlock_irqrestore(&qp->s_lock, flags); +done: + return 1; + +send_ack: + return 0; +} + +static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, + u32 lqpn, u32 rqpn, u8 svc_type) +{ + struct opa_hfi1_cong_log_event_internal *cc_event; + unsigned long flags; + + if (sl >= OPA_MAX_SLS) + return; + + spin_lock_irqsave(&ppd->cc_log_lock, flags); + + ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8); + ppd->threshold_event_counter++; + + cc_event = &ppd->cc_events[ppd->cc_log_idx++]; + if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS) + ppd->cc_log_idx = 0; + cc_event->lqpn = lqpn & RVT_QPN_MASK; + cc_event->rqpn = rqpn & RVT_QPN_MASK; + cc_event->sl = sl; + cc_event->svc_type = svc_type; + cc_event->rlid = rlid; + /* keep timestamp in units of 1.024 usec */ + cc_event->timestamp = ktime_get_ns() / 1024; + + spin_unlock_irqrestore(&ppd->cc_log_lock, flags); +} + +void process_becn(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, u32 lqpn, + u32 rqpn, u8 svc_type) +{ + struct cca_timer *cca_timer; + u16 ccti, ccti_incr, ccti_timer, ccti_limit; + u8 trigger_threshold; + struct cc_state *cc_state; + unsigned long flags; + + if (sl >= OPA_MAX_SLS) + return; + + cc_state = get_cc_state(ppd); + + if (!cc_state) + return; + + /* + * 1) increase CCTI (for this SL) + * 2) select IPG (i.e., call set_link_ipg()) + * 3) start timer + */ + ccti_limit = cc_state->cct.ccti_limit; + ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase; + ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer; + trigger_threshold = + cc_state->cong_setting.entries[sl].trigger_threshold; + + spin_lock_irqsave(&ppd->cca_timer_lock, flags); + + cca_timer = &ppd->cca_timer[sl]; + if (cca_timer->ccti < ccti_limit) { + if (cca_timer->ccti + ccti_incr <= ccti_limit) + cca_timer->ccti += ccti_incr; + else + cca_timer->ccti = ccti_limit; + set_link_ipg(ppd); + } + + ccti = cca_timer->ccti; + + if (!hrtimer_active(&cca_timer->hrtimer)) { + /* ccti_timer is in units of 1.024 usec */ + unsigned long nsec = 1024 * ccti_timer; + + hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec), + HRTIMER_MODE_REL_PINNED); + } + + spin_unlock_irqrestore(&ppd->cca_timer_lock, flags); + + if ((trigger_threshold != 0) && (ccti >= trigger_threshold)) + log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type); +} + +/** + * hfi1_rc_rcv - process an incoming RC packet + * @packet: data packet information + * + * This is called from qp_rcv() to process an incoming RC packet + * for the given QP. + * May be called at interrupt level. + */ +void hfi1_rc_rcv(struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + void *data = packet->payload; + u32 tlen = packet->tlen; + struct rvt_qp *qp = packet->qp; + struct hfi1_qp_priv *qpriv = qp->priv; + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + struct ib_other_headers *ohdr = packet->ohdr; + u32 opcode = packet->opcode; + u32 hdrsize = packet->hlen; + u32 psn = ib_bth_get_psn(packet->ohdr); + u32 pad = packet->pad; + struct ib_wc wc; + u32 pmtu = qp->pmtu; + int diff; + struct ib_reth *reth; + unsigned long flags; + int ret; + bool copy_last = false, fecn; + u32 rkey; + u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); + + lockdep_assert_held(&qp->r_lock); + + if (hfi1_ruc_check_hdr(ibp, packet)) + return; + + fecn = process_ecn(qp, packet); + opfn_trigger_conn_request(qp, be32_to_cpu(ohdr->bth[1])); + + /* + * Process responses (ACKs) before anything else. Note that the + * packet sequence number will be for something in the send work + * queue rather than the expected receive packet sequence number. + * In other words, this QP is the requester. + */ + if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && + opcode <= OP(ATOMIC_ACKNOWLEDGE)) { + rc_rcv_resp(packet); + return; + } + + /* Compute 24 bits worth of difference. */ + diff = delta_psn(psn, qp->r_psn); + if (unlikely(diff)) { + if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) + return; + goto send_ack; + } + + /* Check for opcode sequence errors. */ + switch (qp->r_state) { + case OP(SEND_FIRST): + case OP(SEND_MIDDLE): + if (opcode == OP(SEND_MIDDLE) || + opcode == OP(SEND_LAST) || + opcode == OP(SEND_LAST_WITH_IMMEDIATE) || + opcode == OP(SEND_LAST_WITH_INVALIDATE)) + break; + goto nack_inv; + + case OP(RDMA_WRITE_FIRST): + case OP(RDMA_WRITE_MIDDLE): + if (opcode == OP(RDMA_WRITE_MIDDLE) || + opcode == OP(RDMA_WRITE_LAST) || + opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) + break; + goto nack_inv; + + default: + if (opcode == OP(SEND_MIDDLE) || + opcode == OP(SEND_LAST) || + opcode == OP(SEND_LAST_WITH_IMMEDIATE) || + opcode == OP(SEND_LAST_WITH_INVALIDATE) || + opcode == OP(RDMA_WRITE_MIDDLE) || + opcode == OP(RDMA_WRITE_LAST) || + opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) + goto nack_inv; + /* + * Note that it is up to the requester to not send a new + * RDMA read or atomic operation before receiving an ACK + * for the previous operation. + */ + break; + } + + if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) + rvt_comm_est(qp); + + /* OK, process the packet. */ + switch (opcode) { + case OP(SEND_FIRST): + ret = rvt_get_rwqe(qp, false); + if (ret < 0) + goto nack_op_err; + if (!ret) + goto rnr_nak; + qp->r_rcv_len = 0; + fallthrough; + case OP(SEND_MIDDLE): + case OP(RDMA_WRITE_MIDDLE): +send_middle: + /* Check for invalid length PMTU or posted rwqe len. */ + /* + * There will be no padding for 9B packet but 16B packets + * will come in with some padding since we always add + * CRC and LT bytes which will need to be flit aligned + */ + if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) + goto nack_inv; + qp->r_rcv_len += pmtu; + if (unlikely(qp->r_rcv_len > qp->r_len)) + goto nack_inv; + rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false); + break; + + case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): + /* consume RWQE */ + ret = rvt_get_rwqe(qp, true); + if (ret < 0) + goto nack_op_err; + if (!ret) + goto rnr_nak; + goto send_last_imm; + + case OP(SEND_ONLY): + case OP(SEND_ONLY_WITH_IMMEDIATE): + case OP(SEND_ONLY_WITH_INVALIDATE): + ret = rvt_get_rwqe(qp, false); + if (ret < 0) + goto nack_op_err; + if (!ret) + goto rnr_nak; + qp->r_rcv_len = 0; + if (opcode == OP(SEND_ONLY)) + goto no_immediate_data; + if (opcode == OP(SEND_ONLY_WITH_INVALIDATE)) + goto send_last_inv; + fallthrough; /* for SEND_ONLY_WITH_IMMEDIATE */ + case OP(SEND_LAST_WITH_IMMEDIATE): +send_last_imm: + wc.ex.imm_data = ohdr->u.imm_data; + wc.wc_flags = IB_WC_WITH_IMM; + goto send_last; + case OP(SEND_LAST_WITH_INVALIDATE): +send_last_inv: + rkey = be32_to_cpu(ohdr->u.ieth); + if (rvt_invalidate_rkey(qp, rkey)) + goto no_immediate_data; + wc.ex.invalidate_rkey = rkey; + wc.wc_flags = IB_WC_WITH_INVALIDATE; + goto send_last; + case OP(RDMA_WRITE_LAST): + copy_last = rvt_is_user_qp(qp); + fallthrough; + case OP(SEND_LAST): +no_immediate_data: + wc.wc_flags = 0; + wc.ex.imm_data = 0; +send_last: + /* Check for invalid length. */ + /* LAST len should be >= 1 */ + if (unlikely(tlen < (hdrsize + extra_bytes))) + goto nack_inv; + /* Don't count the CRC(and padding and LT byte for 16B). */ + tlen -= (hdrsize + extra_bytes); + wc.byte_len = tlen + qp->r_rcv_len; + if (unlikely(wc.byte_len > qp->r_len)) + goto nack_inv; + rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, copy_last); + rvt_put_ss(&qp->r_sge); + qp->r_msn++; + if (!__test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) + break; + wc.wr_id = qp->r_wr_id; + wc.status = IB_WC_SUCCESS; + if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || + opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) + wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; + else + wc.opcode = IB_WC_RECV; + wc.qp = &qp->ibqp; + wc.src_qp = qp->remote_qpn; + wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; + /* + * It seems that IB mandates the presence of an SL in a + * work completion only for the UD transport (see section + * 11.4.2 of IBTA Vol. 1). + * + * However, the way the SL is chosen below is consistent + * with the way that IB/qib works and is trying avoid + * introducing incompatibilities. + * + * See also OPA Vol. 1, section 9.7.6, and table 9-17. + */ + wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); + /* zero fields that are N/A */ + wc.vendor_err = 0; + wc.pkey_index = 0; + wc.dlid_path_bits = 0; + wc.port_num = 0; + /* Signal completion event if the solicited bit is set. */ + rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr)); + break; + + case OP(RDMA_WRITE_ONLY): + copy_last = rvt_is_user_qp(qp); + fallthrough; + case OP(RDMA_WRITE_FIRST): + case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): + if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) + goto nack_inv; + /* consume RWQE */ + reth = &ohdr->u.rc.reth; + qp->r_len = be32_to_cpu(reth->length); + qp->r_rcv_len = 0; + qp->r_sge.sg_list = NULL; + if (qp->r_len != 0) { + u32 rkey = be32_to_cpu(reth->rkey); + u64 vaddr = get_ib_reth_vaddr(reth); + int ok; + + /* Check rkey & NAK */ + ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, + rkey, IB_ACCESS_REMOTE_WRITE); + if (unlikely(!ok)) + goto nack_acc; + qp->r_sge.num_sge = 1; + } else { + qp->r_sge.num_sge = 0; + qp->r_sge.sge.mr = NULL; + qp->r_sge.sge.vaddr = NULL; + qp->r_sge.sge.length = 0; + qp->r_sge.sge.sge_length = 0; + } + if (opcode == OP(RDMA_WRITE_FIRST)) + goto send_middle; + else if (opcode == OP(RDMA_WRITE_ONLY)) + goto no_immediate_data; + ret = rvt_get_rwqe(qp, true); + if (ret < 0) + goto nack_op_err; + if (!ret) { + /* peer will send again */ + rvt_put_ss(&qp->r_sge); + goto rnr_nak; + } + wc.ex.imm_data = ohdr->u.rc.imm_data; + wc.wc_flags = IB_WC_WITH_IMM; + goto send_last; + + case OP(RDMA_READ_REQUEST): { + struct rvt_ack_entry *e; + u32 len; + u8 next; + + if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) + goto nack_inv; + next = qp->r_head_ack_queue + 1; + /* s_ack_queue is size rvt_size_atomic()+1 so use > not >= */ + if (next > rvt_size_atomic(ib_to_rvt(qp->ibqp.device))) + next = 0; + spin_lock_irqsave(&qp->s_lock, flags); + if (unlikely(next == qp->s_acked_ack_queue)) { + if (!qp->s_ack_queue[next].sent) + goto nack_inv_unlck; + update_ack_queue(qp, next); + } + e = &qp->s_ack_queue[qp->r_head_ack_queue]; + release_rdma_sge_mr(e); + reth = &ohdr->u.rc.reth; + len = be32_to_cpu(reth->length); + if (len) { + u32 rkey = be32_to_cpu(reth->rkey); + u64 vaddr = get_ib_reth_vaddr(reth); + int ok; + + /* Check rkey & NAK */ + ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, + rkey, IB_ACCESS_REMOTE_READ); + if (unlikely(!ok)) + goto nack_acc_unlck; + /* + * Update the next expected PSN. We add 1 later + * below, so only add the remainder here. + */ + qp->r_psn += rvt_div_mtu(qp, len - 1); + } else { + e->rdma_sge.mr = NULL; + e->rdma_sge.vaddr = NULL; + e->rdma_sge.length = 0; + e->rdma_sge.sge_length = 0; + } + e->opcode = opcode; + e->sent = 0; + e->psn = psn; + e->lpsn = qp->r_psn; + /* + * We need to increment the MSN here instead of when we + * finish sending the result since a duplicate request would + * increment it more than once. + */ + qp->r_msn++; + qp->r_psn++; + qp->r_state = opcode; + qp->r_nak_state = 0; + qp->r_head_ack_queue = next; + qpriv->r_tid_alloc = qp->r_head_ack_queue; + + /* Schedule the send engine. */ + qp->s_flags |= RVT_S_RESP_PENDING; + if (fecn) + qp->s_flags |= RVT_S_ECN; + hfi1_schedule_send(qp); + + spin_unlock_irqrestore(&qp->s_lock, flags); + return; + } + + case OP(COMPARE_SWAP): + case OP(FETCH_ADD): { + struct ib_atomic_eth *ateth = &ohdr->u.atomic_eth; + u64 vaddr = get_ib_ateth_vaddr(ateth); + bool opfn = opcode == OP(COMPARE_SWAP) && + vaddr == HFI1_VERBS_E_ATOMIC_VADDR; + struct rvt_ack_entry *e; + atomic64_t *maddr; + u64 sdata; + u32 rkey; + u8 next; + + if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC) && + !opfn)) + goto nack_inv; + next = qp->r_head_ack_queue + 1; + if (next > rvt_size_atomic(ib_to_rvt(qp->ibqp.device))) + next = 0; + spin_lock_irqsave(&qp->s_lock, flags); + if (unlikely(next == qp->s_acked_ack_queue)) { + if (!qp->s_ack_queue[next].sent) + goto nack_inv_unlck; + update_ack_queue(qp, next); + } + e = &qp->s_ack_queue[qp->r_head_ack_queue]; + release_rdma_sge_mr(e); + /* Process OPFN special virtual address */ + if (opfn) { + opfn_conn_response(qp, e, ateth); + goto ack; + } + if (unlikely(vaddr & (sizeof(u64) - 1))) + goto nack_inv_unlck; + rkey = be32_to_cpu(ateth->rkey); + /* Check rkey & NAK */ + if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), + vaddr, rkey, + IB_ACCESS_REMOTE_ATOMIC))) + goto nack_acc_unlck; + /* Perform atomic OP and save result. */ + maddr = (atomic64_t *)qp->r_sge.sge.vaddr; + sdata = get_ib_ateth_swap(ateth); + e->atomic_data = (opcode == OP(FETCH_ADD)) ? + (u64)atomic64_add_return(sdata, maddr) - sdata : + (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, + get_ib_ateth_compare(ateth), + sdata); + rvt_put_mr(qp->r_sge.sge.mr); + qp->r_sge.num_sge = 0; +ack: + e->opcode = opcode; + e->sent = 0; + e->psn = psn; + e->lpsn = psn; + qp->r_msn++; + qp->r_psn++; + qp->r_state = opcode; + qp->r_nak_state = 0; + qp->r_head_ack_queue = next; + qpriv->r_tid_alloc = qp->r_head_ack_queue; + + /* Schedule the send engine. */ + qp->s_flags |= RVT_S_RESP_PENDING; + if (fecn) + qp->s_flags |= RVT_S_ECN; + hfi1_schedule_send(qp); + + spin_unlock_irqrestore(&qp->s_lock, flags); + return; + } + + default: + /* NAK unknown opcodes. */ + goto nack_inv; + } + qp->r_psn++; + qp->r_state = opcode; + qp->r_ack_psn = psn; + qp->r_nak_state = 0; + /* Send an ACK if requested or required. */ + if (psn & IB_BTH_REQ_ACK || fecn) { + if (packet->numpkt == 0 || fecn || + qp->r_adefered >= HFI1_PSN_CREDIT) { + rc_cancel_ack(qp); + goto send_ack; + } + qp->r_adefered++; + rc_defered_ack(rcd, qp); + } + return; + +rnr_nak: + qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK; + qp->r_ack_psn = qp->r_psn; + /* Queue RNR NAK for later */ + rc_defered_ack(rcd, qp); + return; + +nack_op_err: + rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); + qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; + qp->r_ack_psn = qp->r_psn; + /* Queue NAK for later */ + rc_defered_ack(rcd, qp); + return; + +nack_inv_unlck: + spin_unlock_irqrestore(&qp->s_lock, flags); +nack_inv: + rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); + qp->r_nak_state = IB_NAK_INVALID_REQUEST; + qp->r_ack_psn = qp->r_psn; + /* Queue NAK for later */ + rc_defered_ack(rcd, qp); + return; + +nack_acc_unlck: + spin_unlock_irqrestore(&qp->s_lock, flags); +nack_acc: + rvt_rc_error(qp, IB_WC_LOC_PROT_ERR); + qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; + qp->r_ack_psn = qp->r_psn; +send_ack: + hfi1_send_rc_ack(packet, fecn); +} + +void hfi1_rc_hdrerr( + struct hfi1_ctxtdata *rcd, + struct hfi1_packet *packet, + struct rvt_qp *qp) +{ + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + int diff; + u32 opcode; + u32 psn; + + if (hfi1_ruc_check_hdr(ibp, packet)) + return; + + psn = ib_bth_get_psn(packet->ohdr); + opcode = ib_bth_get_opcode(packet->ohdr); + + /* Only deal with RDMA Writes for now */ + if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) { + diff = delta_psn(psn, qp->r_psn); + if (!qp->r_nak_state && diff >= 0) { + ibp->rvp.n_rc_seqnak++; + qp->r_nak_state = IB_NAK_PSN_ERROR; + /* Use the expected PSN. */ + qp->r_ack_psn = qp->r_psn; + /* + * Wait to send the sequence + * NAK until all packets + * in the receive queue have + * been processed. + * Otherwise, we end up + * propagating congestion. + */ + rc_defered_ack(rcd, qp); + } /* Out of sequence NAK */ + } /* QP Request NAKs */ +} |