drivers/infiniband/hw/hfi1/uc.c - linux - Git at Google

 /*
  * Copyright(c) 2015 - 2018 Intel Corporation.
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * BSD LICENSE
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  - Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  - Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  - Neither the name of Intel Corporation nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "hfi.h"
 #include "verbs_txreq.h"
 #include "qp.h"

 /* cut down ridiculously long IB macro names */
 #define OP(x) UC_OP(x)

 /**
  * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
  * @qp: a pointer to the QP
  *
  * Assume s_lock is held.
  *
  * Return 1 if constructed; otherwise, return 0.
  */
 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 {
 	struct hfi1_qp_priv *priv = qp->priv;
 	struct ib_other_headers *ohdr;
 	struct rvt_swqe *wqe;
 	u32 hwords;
 	u32 bth0 = 0;
 	u32 len;
 	u32 pmtu = qp->pmtu;
 	int middle = 0;

 	ps->s_txreq = get_txreq(ps->dev, qp);
 	if (!ps->s_txreq)
 		goto bail_no_tx;

 	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_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
 		goto done_free_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;
 	}

 	/* Get the next send request. */
 	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
 	qp->s_wqe = NULL;
 	switch (qp->s_state) {
 	default:
 		if (!(ib_rvt_state_ops[qp->state] &
 		    RVT_PROCESS_NEXT_SEND_OK))
 			goto bail;
 		/* Check if send work queue is empty. */
 		if (qp->s_cur == READ_ONCE(qp->s_head)) {
 			clear_ahg(qp);
 			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 (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
 				err = rvt_invalidate_rkey(
 					qp, wqe->wr.ex.invalidate_rkey);
 				local_ops = 1;
 			}
 			hfi1_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;
 		}
 		/*
 		 * Start a new request.
 		 */
 		qp->s_psn = wqe->psn;
 		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;
 		len = wqe->length;
 		qp->s_len = len;
 		switch (wqe->wr.opcode) {
 		case IB_WR_SEND:
 		case IB_WR_SEND_WITH_IMM:
 			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 {
 				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;
 			}
 			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 				bth0 |= IB_BTH_SOLICITED;
 			qp->s_wqe = wqe;
 			if (++qp->s_cur >= qp->s_size)
 				qp->s_cur = 0;
 			break;

 		case IB_WR_RDMA_WRITE:
 		case IB_WR_RDMA_WRITE_WITH_IMM:
 			ohdr->u.rc.reth.vaddr =
 				cpu_to_be64(wqe->rdma_wr.remote_addr);
 			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) / 4;
 			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 the 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;
 			}
 			qp->s_wqe = wqe;
 			if (++qp->s_cur >= qp->s_size)
 				qp->s_cur = 0;
 			break;

 		default:
 			goto bail;
 		}
 		break;

 	case OP(SEND_FIRST):
 		qp->s_state = OP(SEND_MIDDLE);
 		/* FALLTHROUGH */
 	case OP(SEND_MIDDLE):
 		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 {
 			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;
 		}
 		if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 			bth0 |= IB_BTH_SOLICITED;
 		qp->s_wqe = wqe;
 		if (++qp->s_cur >= qp->s_size)
 			qp->s_cur = 0;
 		break;

 	case OP(RDMA_WRITE_FIRST):
 		qp->s_state = OP(RDMA_WRITE_MIDDLE);
 		/* FALLTHROUGH */
 	case OP(RDMA_WRITE_MIDDLE):
 		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;
 		}
 		qp->s_wqe = wqe;
 		if (++qp->s_cur >= qp->s_size)
 			qp->s_cur = 0;
 		break;
 	}
 	qp->s_len -= len;
 	ps->s_txreq->hdr_dwords = hwords;
 	ps->s_txreq->sde = priv->s_sde;
 	ps->s_txreq->ss = &qp->s_sge;
 	ps->s_txreq->s_cur_size = len;
 	hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 			     mask_psn(qp->s_psn++), 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;
 	return 0;
 }

 /**
  * hfi1_uc_rcv - handle an incoming UC packet
  * @ibp: the port the packet came in on
  * @hdr: the header of the packet
  * @rcv_flags: flags relevant to rcv processing
  * @data: the packet data
  * @tlen: the length of the packet
  * @qp: the QP for this packet.
  *
  * This is called from qp_rcv() to process an incoming UC packet
  * for the given QP.
  * Called at interrupt level.
  */
 void hfi1_uc_rcv(struct hfi1_packet *packet)
 {
 	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
 	void *data = packet->payload;
 	u32 tlen = packet->tlen;
 	struct rvt_qp *qp = packet->qp;
 	struct ib_other_headers *ohdr = packet->ohdr;
 	u32 opcode = packet->opcode;
 	u32 hdrsize = packet->hlen;
 	u32 psn;
 	u32 pad = packet->pad;
 	struct ib_wc wc;
 	u32 pmtu = qp->pmtu;
 	struct ib_reth *reth;
 	int ret;
 	u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);

 	if (hfi1_ruc_check_hdr(ibp, packet))
 		return;

 	process_ecn(qp, packet, true);

 	psn = ib_bth_get_psn(ohdr);
 	/* Compare the PSN verses the expected PSN. */
 	if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
 		/*
 		 * Handle a sequence error.
 		 * Silently drop any current message.
 		 */
 		qp->r_psn = psn;
 inv:
 		if (qp->r_state == OP(SEND_FIRST) ||
 		    qp->r_state == OP(SEND_MIDDLE)) {
 			set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 			qp->r_sge.num_sge = 0;
 		} else {
 			rvt_put_ss(&qp->r_sge);
 		}
 		qp->r_state = OP(SEND_LAST);
 		switch (opcode) {
 		case OP(SEND_FIRST):
 		case OP(SEND_ONLY):
 		case OP(SEND_ONLY_WITH_IMMEDIATE):
 			goto send_first;

 		case OP(RDMA_WRITE_FIRST):
 		case OP(RDMA_WRITE_ONLY):
 		case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 			goto rdma_first;

 		default:
 			goto drop;
 		}
 	}

 	/* 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))
 			break;
 		goto 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 inv;

 	default:
 		if (opcode == OP(SEND_FIRST) ||
 		    opcode == OP(SEND_ONLY) ||
 		    opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 		    opcode == OP(RDMA_WRITE_FIRST) ||
 		    opcode == OP(RDMA_WRITE_ONLY) ||
 		    opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 			break;
 		goto inv;
 	}

 	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):
 	case OP(SEND_ONLY):
 	case OP(SEND_ONLY_WITH_IMMEDIATE):
 send_first:
 		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 			qp->r_sge = qp->s_rdma_read_sge;
 		} else {
 			ret = rvt_get_rwqe(qp, false);
 			if (ret < 0)
 				goto op_err;
 			if (!ret)
 				goto drop;
 			/*
 			 * qp->s_rdma_read_sge will be the owner
 			 * of the mr references.
 			 */
 			qp->s_rdma_read_sge = qp->r_sge;
 		}
 		qp->r_rcv_len = 0;
 		if (opcode == OP(SEND_ONLY))
 			goto no_immediate_data;
 		else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 			goto send_last_imm;
 		/* FALLTHROUGH */
 	case OP(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 rewind;
 		qp->r_rcv_len += pmtu;
 		if (unlikely(qp->r_rcv_len > qp->r_len))
 			goto rewind;
 		hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false);
 		break;

 	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):
 no_immediate_data:
 		wc.ex.imm_data = 0;
 		wc.wc_flags = 0;
 send_last:
 		/* Check for invalid length. */
 		/* LAST len should be >= 1 */
 		if (unlikely(tlen < (hdrsize + extra_bytes)))
 			goto rewind;
 		/* Don't count the CRC. */
 		tlen -= (hdrsize + extra_bytes);
 		wc.byte_len = tlen + qp->r_rcv_len;
 		if (unlikely(wc.byte_len > qp->r_len))
 			goto rewind;
 		wc.opcode = IB_WC_RECV;
 		hfi1_copy_sge(&qp->r_sge, data, tlen, false, false);
 		rvt_put_ss(&qp->s_rdma_read_sge);
 last_imm:
 		wc.wr_id = qp->r_wr_id;
 		wc.status = IB_WC_SUCCESS;
 		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_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 			     ib_bth_is_solicited(ohdr));
 		break;

 	case OP(RDMA_WRITE_FIRST):
 	case OP(RDMA_WRITE_ONLY):
 	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 rdma_first:
 		if (unlikely(!(qp->qp_access_flags &
 			       IB_ACCESS_REMOTE_WRITE))) {
 			goto drop;
 		}
 		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 = be64_to_cpu(reth->vaddr);
 			int ok;

 			/* Check rkey */
 			ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 					 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 			if (unlikely(!ok))
 				goto drop;
 			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_ONLY)) {
 			goto rdma_last;
 		} else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 			wc.ex.imm_data = ohdr->u.rc.imm_data;
 			goto rdma_last_imm;
 		}
 		/* FALLTHROUGH */
 	case OP(RDMA_WRITE_MIDDLE):
 		/* Check for invalid length PMTU or posted rwqe len. */
 		if (unlikely(tlen != (hdrsize + pmtu + 4)))
 			goto drop;
 		qp->r_rcv_len += pmtu;
 		if (unlikely(qp->r_rcv_len > qp->r_len))
 			goto drop;
 		hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false);
 		break;

 	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 		wc.ex.imm_data = ohdr->u.imm_data;
 rdma_last_imm:
 		wc.wc_flags = IB_WC_WITH_IMM;

 		/* Check for invalid length. */
 		/* LAST len should be >= 1 */
 		if (unlikely(tlen < (hdrsize + pad + 4)))
 			goto drop;
 		/* Don't count the CRC. */
 		tlen -= (hdrsize + extra_bytes);
 		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 			goto drop;
 		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 			rvt_put_ss(&qp->s_rdma_read_sge);
 		} else {
 			ret = rvt_get_rwqe(qp, true);
 			if (ret < 0)
 				goto op_err;
 			if (!ret)
 				goto drop;
 		}
 		wc.byte_len = qp->r_len;
 		wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 		hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
 		rvt_put_ss(&qp->r_sge);
 		goto last_imm;

 	case OP(RDMA_WRITE_LAST):
 rdma_last:
 		/* Check for invalid length. */
 		/* LAST len should be >= 1 */
 		if (unlikely(tlen < (hdrsize + pad + 4)))
 			goto drop;
 		/* Don't count the CRC. */
 		tlen -= (hdrsize + extra_bytes);
 		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 			goto drop;
 		hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
 		rvt_put_ss(&qp->r_sge);
 		break;

 	default:
 		/* Drop packet for unknown opcodes. */
 		goto drop;
 	}
 	qp->r_psn++;
 	qp->r_state = opcode;
 	return;

 rewind:
 	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 	qp->r_sge.num_sge = 0;
 drop:
 	ibp->rvp.n_pkt_drops++;
 	return;

 op_err:
 	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 }
	/*
	* Copyright(c) 2015 - 2018 Intel Corporation.
	*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* BSD LICENSE
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* - Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* - Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* - Neither the name of Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "hfi.h"
	#include "verbs_txreq.h"
	#include "qp.h"

	/* cut down ridiculously long IB macro names */
	#define OP(x) UC_OP(x)

	/**
	* hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
	* @qp: a pointer to the QP
	*
	* Assume s_lock is held.
	*
	* Return 1 if constructed; otherwise, return 0.
	*/
	int hfi1_make_uc_req(struct rvt_qp qp, struct hfi1_pkt_state ps)
	{
	struct hfi1_qp_priv *priv = qp->priv;
	struct ib_other_headers *ohdr;
	struct rvt_swqe *wqe;
	u32 hwords;
	u32 bth0 = 0;
	u32 len;
	u32 pmtu = qp->pmtu;
	int middle = 0;

	ps->s_txreq = get_txreq(ps->dev, qp);
	if (!ps->s_txreq)
	goto bail_no_tx;

	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_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
	goto done_free_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;
	}

	/* Get the next send request. */
	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
	qp->s_wqe = NULL;
	switch (qp->s_state) {
	default:
	if (!(ib_rvt_state_ops[qp->state] &
	RVT_PROCESS_NEXT_SEND_OK))
	goto bail;
	/* Check if send work queue is empty. */
	if (qp->s_cur == READ_ONCE(qp->s_head)) {
	clear_ahg(qp);
	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 (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
	err = rvt_invalidate_rkey(
	qp, wqe->wr.ex.invalidate_rkey);
	local_ops = 1;
	}
	hfi1_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;
	}
	/*
	* Start a new request.
	*/
	qp->s_psn = wqe->psn;
	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;
	len = wqe->length;
	qp->s_len = len;
	switch (wqe->wr.opcode) {
	case IB_WR_SEND:
	case IB_WR_SEND_WITH_IMM:
	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 {
	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;
	}
	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	bth0 \|= IB_BTH_SOLICITED;
	qp->s_wqe = wqe;
	if (++qp->s_cur >= qp->s_size)
	qp->s_cur = 0;
	break;

	case IB_WR_RDMA_WRITE:
	case IB_WR_RDMA_WRITE_WITH_IMM:
	ohdr->u.rc.reth.vaddr =
	cpu_to_be64(wqe->rdma_wr.remote_addr);
	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) / 4;
	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 the 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;
	}
	qp->s_wqe = wqe;
	if (++qp->s_cur >= qp->s_size)
	qp->s_cur = 0;
	break;

	default:
	goto bail;
	}
	break;

	case OP(SEND_FIRST):
	qp->s_state = OP(SEND_MIDDLE);
	/* FALLTHROUGH */
	case OP(SEND_MIDDLE):
	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 {
	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;
	}
	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	bth0 \|= IB_BTH_SOLICITED;
	qp->s_wqe = wqe;
	if (++qp->s_cur >= qp->s_size)
	qp->s_cur = 0;
	break;

	case OP(RDMA_WRITE_FIRST):
	qp->s_state = OP(RDMA_WRITE_MIDDLE);
	/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
	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;
	}
	qp->s_wqe = wqe;
	if (++qp->s_cur >= qp->s_size)
	qp->s_cur = 0;
	break;
	}
	qp->s_len -= len;
	ps->s_txreq->hdr_dwords = hwords;
	ps->s_txreq->sde = priv->s_sde;
	ps->s_txreq->ss = &qp->s_sge;
	ps->s_txreq->s_cur_size = len;
	hfi1_make_ruc_header(qp, ohdr, bth0 \| (qp->s_state << 24),
	mask_psn(qp->s_psn++), 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;
	return 0;
	}

	/**
	* hfi1_uc_rcv - handle an incoming UC packet
	* @ibp: the port the packet came in on
	* @hdr: the header of the packet
	* @rcv_flags: flags relevant to rcv processing
	* @data: the packet data
	* @tlen: the length of the packet
	* @qp: the QP for this packet.
	*
	* This is called from qp_rcv() to process an incoming UC packet
	* for the given QP.
	* Called at interrupt level.
	*/
	void hfi1_uc_rcv(struct hfi1_packet *packet)
	{
	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
	void *data = packet->payload;
	u32 tlen = packet->tlen;
	struct rvt_qp *qp = packet->qp;
	struct ib_other_headers *ohdr = packet->ohdr;
	u32 opcode = packet->opcode;
	u32 hdrsize = packet->hlen;
	u32 psn;
	u32 pad = packet->pad;
	struct ib_wc wc;
	u32 pmtu = qp->pmtu;
	struct ib_reth *reth;
	int ret;
	u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);

	if (hfi1_ruc_check_hdr(ibp, packet))
	return;

	process_ecn(qp, packet, true);

	psn = ib_bth_get_psn(ohdr);
	/* Compare the PSN verses the expected PSN. */
	if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
	/*
	* Handle a sequence error.
	* Silently drop any current message.
	*/
	qp->r_psn = psn;
	inv:
	if (qp->r_state == OP(SEND_FIRST) \|\|
	qp->r_state == OP(SEND_MIDDLE)) {
	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
	qp->r_sge.num_sge = 0;
	} else {
	rvt_put_ss(&qp->r_sge);
	}
	qp->r_state = OP(SEND_LAST);
	switch (opcode) {
	case OP(SEND_FIRST):
	case OP(SEND_ONLY):
	case OP(SEND_ONLY_WITH_IMMEDIATE):
	goto send_first;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_ONLY):
	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
	goto rdma_first;

	default:
	goto drop;
	}
	}

	/* 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))
	break;
	goto 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 inv;

	default:
	if (opcode == OP(SEND_FIRST) \|\|
	opcode == OP(SEND_ONLY) \|\|
	opcode == OP(SEND_ONLY_WITH_IMMEDIATE) \|\|
	opcode == OP(RDMA_WRITE_FIRST) \|\|
	opcode == OP(RDMA_WRITE_ONLY) \|\|
	opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
	break;
	goto inv;
	}

	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):
	case OP(SEND_ONLY):
	case OP(SEND_ONLY_WITH_IMMEDIATE):
	send_first:
	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
	qp->r_sge = qp->s_rdma_read_sge;
	} else {
	ret = rvt_get_rwqe(qp, false);
	if (ret < 0)
	goto op_err;
	if (!ret)
	goto drop;
	/*
	* qp->s_rdma_read_sge will be the owner
	* of the mr references.
	*/
	qp->s_rdma_read_sge = qp->r_sge;
	}
	qp->r_rcv_len = 0;
	if (opcode == OP(SEND_ONLY))
	goto no_immediate_data;
	else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
	goto send_last_imm;
	/* FALLTHROUGH */
	case OP(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 rewind;
	qp->r_rcv_len += pmtu;
	if (unlikely(qp->r_rcv_len > qp->r_len))
	goto rewind;
	hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false);
	break;

	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):
	no_immediate_data:
	wc.ex.imm_data = 0;
	wc.wc_flags = 0;
	send_last:
	/* Check for invalid length. */
	/* LAST len should be >= 1 */
	if (unlikely(tlen < (hdrsize + extra_bytes)))
	goto rewind;
	/* Don't count the CRC. */
	tlen -= (hdrsize + extra_bytes);
	wc.byte_len = tlen + qp->r_rcv_len;
	if (unlikely(wc.byte_len > qp->r_len))
	goto rewind;
	wc.opcode = IB_WC_RECV;
	hfi1_copy_sge(&qp->r_sge, data, tlen, false, false);
	rvt_put_ss(&qp->s_rdma_read_sge);
	last_imm:
	wc.wr_id = qp->r_wr_id;
	wc.status = IB_WC_SUCCESS;
	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_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
	ib_bth_is_solicited(ohdr));
	break;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_ONLY):
	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
	rdma_first:
	if (unlikely(!(qp->qp_access_flags &
	IB_ACCESS_REMOTE_WRITE))) {
	goto drop;
	}
	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 = be64_to_cpu(reth->vaddr);
	int ok;

	/* Check rkey */
	ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
	vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
	if (unlikely(!ok))
	goto drop;
	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_ONLY)) {
	goto rdma_last;
	} else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
	wc.ex.imm_data = ohdr->u.rc.imm_data;
	goto rdma_last_imm;
	}
	/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
	/* Check for invalid length PMTU or posted rwqe len. */
	if (unlikely(tlen != (hdrsize + pmtu + 4)))
	goto drop;
	qp->r_rcv_len += pmtu;
	if (unlikely(qp->r_rcv_len > qp->r_len))
	goto drop;
	hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false);
	break;

	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
	wc.ex.imm_data = ohdr->u.imm_data;
	rdma_last_imm:
	wc.wc_flags = IB_WC_WITH_IMM;

	/* Check for invalid length. */
	/* LAST len should be >= 1 */
	if (unlikely(tlen < (hdrsize + pad + 4)))
	goto drop;
	/* Don't count the CRC. */
	tlen -= (hdrsize + extra_bytes);
	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	goto drop;
	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
	rvt_put_ss(&qp->s_rdma_read_sge);
	} else {
	ret = rvt_get_rwqe(qp, true);
	if (ret < 0)
	goto op_err;
	if (!ret)
	goto drop;
	}
	wc.byte_len = qp->r_len;
	wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
	hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
	rvt_put_ss(&qp->r_sge);
	goto last_imm;

	case OP(RDMA_WRITE_LAST):
	rdma_last:
	/* Check for invalid length. */
	/* LAST len should be >= 1 */
	if (unlikely(tlen < (hdrsize + pad + 4)))
	goto drop;
	/* Don't count the CRC. */
	tlen -= (hdrsize + extra_bytes);
	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	goto drop;
	hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
	rvt_put_ss(&qp->r_sge);
	break;

	default:
	/* Drop packet for unknown opcodes. */
	goto drop;
	}
	qp->r_psn++;
	qp->r_state = opcode;
	return;

	rewind:
	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
	qp->r_sge.num_sge = 0;
	drop:
	ibp->rvp.n_pkt_drops++;
	return;

	op_err:
	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
	}