[mirror_ubuntu-hirsute-kernel.git] / drivers / infiniband / hw / qib / qib_uc.c

/*
 * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
 * All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "qib.h"

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

/**
 * qib_make_uc_req - construct a request packet (SEND, RDMA write)
 * @qp: a pointer to the QP
 *
 * Assumes the s_lock is held.
 *
 * Return 1 if constructed; otherwise, return 0.
 */
int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
{
	struct qib_qp_priv *priv = qp->priv;
	struct ib_other_headers *ohdr;
	struct rvt_swqe *wqe;
	u32 hwords;
	u32 bth0;
	u32 len;
	u32 pmtu = qp->pmtu;
	int ret = 0;

	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 (atomic_read(&priv->s_dma_busy)) {
			qp->s_flags |= RVT_S_WAIT_DMA;
			goto bail;
		}
		wqe = rvt_get_swqe_ptr(qp, qp->s_last);
		rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
		goto done;
	}

	ohdr = &priv->s_hdr->u.oth;
	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
		ohdr = &priv->s_hdr->u.l.oth;

	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
	hwords = 5;
	bth0 = 0;

	/* 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))
			goto bail;
		/*
		 * 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;
			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;
			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;
	qp->s_hdrwords = hwords;
	qp->s_cur_sge = &qp->s_sge;
	qp->s_cur_size = len;
	qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
			    qp->s_psn++ & QIB_PSN_MASK);
done:
	return 1;
bail:
	qp->s_flags &= ~RVT_S_BUSY;
	return ret;
}

/**
 * qib_uc_rcv - handle an incoming UC packet
 * @ibp: the port the packet came in on
 * @hdr: the header of the packet
 * @has_grh: true if the packet has a GRH
 * @data: the packet data
 * @tlen: the length of the packet
 * @qp: the QP for this packet.
 *
 * This is called from qib_qp_rcv() to process an incoming UC packet
 * for the given QP.
 * Called at interrupt level.
 */
void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
		int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
{
	struct ib_other_headers *ohdr;
	u32 opcode;
	u32 hdrsize;
	u32 psn;
	u32 pad;
	struct ib_wc wc;
	u32 pmtu = qp->pmtu;
	struct ib_reth *reth;
	int ret;

	/* Check for GRH */
	if (!has_grh) {
		ohdr = &hdr->u.oth;
		hdrsize = 8 + 12;       /* LRH + BTH */
	} else {
		ohdr = &hdr->u.l.oth;
		hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
	}

	opcode = be32_to_cpu(ohdr->bth[0]);
	if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
		return;

	psn = be32_to_cpu(ohdr->bth[2]);
	opcode >>= 24;

	/* Compare the PSN verses the expected PSN. */
	if (unlikely(qib_cmp24(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. */
		if (unlikely(tlen != (hdrsize + pmtu + 4)))
			goto rewind;
		qp->r_rcv_len += pmtu;
		if (unlikely(qp->r_rcv_len > qp->r_len))
			goto rewind;
		rvt_copy_sge(qp, &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;
		hdrsize += 4;
		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:
		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4)))
			goto rewind;
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		wc.byte_len = tlen + qp->r_rcv_len;
		if (unlikely(wc.byte_len > qp->r_len))
			goto rewind;
		wc.opcode = IB_WC_RECV;
		rvt_copy_sge(qp, &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);
		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_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;
		hdrsize += sizeof(*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;
		rvt_copy_sge(qp, &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:
		hdrsize += 4;
		wc.wc_flags = IB_WC_WITH_IMM;

		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4)))
			goto drop;
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		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;
		rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
		rvt_put_ss(&qp->r_sge);
		goto last_imm;

	case OP(RDMA_WRITE_LAST):
rdma_last:
		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4)))
			goto drop;
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
			goto drop;
		rvt_copy_sge(qp, &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);
	return;

}
Commit	Line	Data
f931551b RC	1	/*
	2	* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
	3	* All rights reserved.
	4	* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
	5	*
	6	* This software is available to you under a choice of one of two
	7	* licenses. You may choose to be licensed under the terms of the GNU
	8	* General Public License (GPL) Version 2, available from the file
	9	* COPYING in the main directory of this source tree, or the
	10	* OpenIB.org BSD license below:
	11	*
	12	* Redistribution and use in source and binary forms, with or
	13	* without modification, are permitted provided that the following
	14	* conditions are met:
	15	*
	16	* - Redistributions of source code must retain the above
	17	* copyright notice, this list of conditions and the following
	18	* disclaimer.
	19	*
	20	* - Redistributions in binary form must reproduce the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer in the documentation and/or other materials
	23	* provided with the distribution.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	26	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	27	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	28	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	29	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	30	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	31	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	32	* SOFTWARE.
	33	*/
	34
	35	#include "qib.h"
	36
	37	/* cut down ridiculously long IB macro names */
	38	#define OP(x) IB_OPCODE_UC_##x
	39
	40	/**
	41	* qib_make_uc_req - construct a request packet (SEND, RDMA write)
	42	* @qp: a pointer to the QP
	43	*
46a80d62 MM	44	* Assumes the s_lock is held.
46a80d62 MM	45	*
f931551b RC	46	* Return 1 if constructed; otherwise, return 0.
f931551b RC	47	*/
747f4d7a	48	int qib_make_uc_req(struct rvt_qp qp, unsigned long flags)
f931551b	49	{
ffc26907	50	struct qib_qp_priv *priv = qp->priv;
261a4351	51	struct ib_other_headers *ohdr;
7c2e11fe	52	struct rvt_swqe *wqe;
f931551b RC	53	u32 hwords;
	54	u32 bth0;
	55	u32 len;
cc6ea138	56	u32 pmtu = qp->pmtu;
f931551b RC	57	int ret = 0;
f931551b RC	58
db3ef0eb HC	59	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
db3ef0eb HC	60	if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
f931551b RC	61	goto bail;
f931551b RC	62	/* We are in the error state, flush the work request. */
6aa7de05	63	if (qp->s_last == READ_ONCE(qp->s_head))
f931551b RC	64	goto bail;
f931551b RC	65	/* If DMAs are in progress, we can't flush immediately. */
ffc26907	66	if (atomic_read(&priv->s_dma_busy)) {
01ba79d4	67	qp->s_flags \|= RVT_S_WAIT_DMA;
f931551b RC	68	goto bail;
f931551b RC	69	}
db3ef0eb	70	wqe = rvt_get_swqe_ptr(qp, qp->s_last);
116aa033	71	rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
f931551b RC	72	goto done;
	73	}
	74
ffc26907	75	ohdr = &priv->s_hdr->u.oth;
d8966fcd	76	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
ffc26907	77	ohdr = &priv->s_hdr->u.l.oth;
f931551b RC	78
	79	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
	80	hwords = 5;
	81	bth0 = 0;
	82
	83	/* Get the next send request. */
db3ef0eb	84	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
f931551b RC	85	qp->s_wqe = NULL;
	86	switch (qp->s_state) {
	87	default:
db3ef0eb HC	88	if (!(ib_rvt_state_ops[qp->state] &
db3ef0eb HC	89	RVT_PROCESS_NEXT_SEND_OK))
f931551b RC	90	goto bail;
f931551b RC	91	/* Check if send work queue is empty. */
6aa7de05	92	if (qp->s_cur == READ_ONCE(qp->s_head))
f931551b RC	93	goto bail;
	94	/*
	95	* Start a new request.
	96	*/
46a80d62	97	qp->s_psn = wqe->psn;
f931551b RC	98	qp->s_sge.sge = wqe->sg_list[0];
	99	qp->s_sge.sg_list = wqe->sg_list + 1;
	100	qp->s_sge.num_sge = wqe->wr.num_sge;
	101	qp->s_sge.total_len = wqe->length;
	102	len = wqe->length;
	103	qp->s_len = len;
	104	switch (wqe->wr.opcode) {
	105	case IB_WR_SEND:
	106	case IB_WR_SEND_WITH_IMM:
	107	if (len > pmtu) {
	108	qp->s_state = OP(SEND_FIRST);
	109	len = pmtu;
	110	break;
	111	}
	112	if (wqe->wr.opcode == IB_WR_SEND)
	113	qp->s_state = OP(SEND_ONLY);
	114	else {
	115	qp->s_state =
	116	OP(SEND_ONLY_WITH_IMMEDIATE);
	117	/* Immediate data comes after the BTH */
	118	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	119	hwords += 1;
	120	}
	121	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	122	bth0 \|= IB_BTH_SOLICITED;
	123	qp->s_wqe = wqe;
	124	if (++qp->s_cur >= qp->s_size)
	125	qp->s_cur = 0;
	126	break;
	127
	128	case IB_WR_RDMA_WRITE:
	129	case IB_WR_RDMA_WRITE_WITH_IMM:
	130	ohdr->u.rc.reth.vaddr =
e622f2f4	131	cpu_to_be64(wqe->rdma_wr.remote_addr);
f931551b	132	ohdr->u.rc.reth.rkey =
e622f2f4	133	cpu_to_be32(wqe->rdma_wr.rkey);
f931551b RC	134	ohdr->u.rc.reth.length = cpu_to_be32(len);
	135	hwords += sizeof(struct ib_reth) / 4;
	136	if (len > pmtu) {
	137	qp->s_state = OP(RDMA_WRITE_FIRST);
	138	len = pmtu;
	139	break;
	140	}
	141	if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
	142	qp->s_state = OP(RDMA_WRITE_ONLY);
	143	else {
	144	qp->s_state =
	145	OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
	146	/* Immediate data comes after the RETH */
	147	ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
	148	hwords += 1;
	149	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	150	bth0 \|= IB_BTH_SOLICITED;
	151	}
	152	qp->s_wqe = wqe;
	153	if (++qp->s_cur >= qp->s_size)
	154	qp->s_cur = 0;
	155	break;
	156
	157	default:
	158	goto bail;
	159	}
	160	break;
	161
	162	case OP(SEND_FIRST):
	163	qp->s_state = OP(SEND_MIDDLE);
df561f66	164	fallthrough;
f931551b RC	165	case OP(SEND_MIDDLE):
	166	len = qp->s_len;
	167	if (len > pmtu) {
	168	len = pmtu;
	169	break;
	170	}
	171	if (wqe->wr.opcode == IB_WR_SEND)
	172	qp->s_state = OP(SEND_LAST);
	173	else {
	174	qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
	175	/* Immediate data comes after the BTH */
	176	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	177	hwords += 1;
	178	}
	179	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	180	bth0 \|= IB_BTH_SOLICITED;
	181	qp->s_wqe = wqe;
	182	if (++qp->s_cur >= qp->s_size)
	183	qp->s_cur = 0;
	184	break;
	185
	186	case OP(RDMA_WRITE_FIRST):
	187	qp->s_state = OP(RDMA_WRITE_MIDDLE);
df561f66	188	fallthrough;
f931551b RC	189	case OP(RDMA_WRITE_MIDDLE):
	190	len = qp->s_len;
	191	if (len > pmtu) {
	192	len = pmtu;
	193	break;
	194	}
	195	if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
	196	qp->s_state = OP(RDMA_WRITE_LAST);
	197	else {
	198	qp->s_state =
	199	OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
	200	/* Immediate data comes after the BTH */
	201	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	202	hwords += 1;
	203	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	204	bth0 \|= IB_BTH_SOLICITED;
	205	}
	206	qp->s_wqe = wqe;
	207	if (++qp->s_cur >= qp->s_size)
	208	qp->s_cur = 0;
	209	break;
	210	}
	211	qp->s_len -= len;
	212	qp->s_hdrwords = hwords;
	213	qp->s_cur_sge = &qp->s_sge;
	214	qp->s_cur_size = len;
	215	qib_make_ruc_header(qp, ohdr, bth0 \| (qp->s_state << 24),
46a80d62	216	qp->s_psn++ & QIB_PSN_MASK);
f931551b	217	done:
46a80d62	218	return 1;
f931551b	219	bail:
01ba79d4	220	qp->s_flags &= ~RVT_S_BUSY;
f931551b RC	221	return ret;
	222	}
	223
	224	/**
	225	* qib_uc_rcv - handle an incoming UC packet
	226	* @ibp: the port the packet came in on
	227	* @hdr: the header of the packet
	228	* @has_grh: true if the packet has a GRH
	229	* @data: the packet data
	230	* @tlen: the length of the packet
	231	* @qp: the QP for this packet.
	232	*
	233	* This is called from qib_qp_rcv() to process an incoming UC packet
	234	* for the given QP.
	235	* Called at interrupt level.
	236	*/
261a4351	237	void qib_uc_rcv(struct qib_ibport ibp, struct ib_header hdr,
7c2e11fe	238	int has_grh, void data, u32 tlen, struct rvt_qp qp)
f931551b	239	{
261a4351	240	struct ib_other_headers *ohdr;
f931551b RC	241	u32 opcode;
	242	u32 hdrsize;
	243	u32 psn;
	244	u32 pad;
	245	struct ib_wc wc;
cc6ea138	246	u32 pmtu = qp->pmtu;
f931551b RC	247	struct ib_reth *reth;
	248	int ret;
	249
	250	/* Check for GRH */
	251	if (!has_grh) {
	252	ohdr = &hdr->u.oth;
	253	hdrsize = 8 + 12; /* LRH + BTH */
	254	} else {
	255	ohdr = &hdr->u.l.oth;
	256	hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
	257	}
	258
	259	opcode = be32_to_cpu(ohdr->bth[0]);
f931551b	260	if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
9fd5473d	261	return;
f931551b RC	262
	263	psn = be32_to_cpu(ohdr->bth[2]);
	264	opcode >>= 24;
f931551b	265
f931551b RC	266	/* Compare the PSN verses the expected PSN. */
	267	if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
	268	/*
	269	* Handle a sequence error.
	270	* Silently drop any current message.
	271	*/
	272	qp->r_psn = psn;
	273	inv:
	274	if (qp->r_state == OP(SEND_FIRST) \|\|
	275	qp->r_state == OP(SEND_MIDDLE)) {
01ba79d4	276	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
f931551b RC	277	qp->r_sge.num_sge = 0;
f931551b RC	278	} else
70696ea7	279	rvt_put_ss(&qp->r_sge);
f931551b RC	280	qp->r_state = OP(SEND_LAST);
	281	switch (opcode) {
	282	case OP(SEND_FIRST):
	283	case OP(SEND_ONLY):
	284	case OP(SEND_ONLY_WITH_IMMEDIATE):
	285	goto send_first;
	286
	287	case OP(RDMA_WRITE_FIRST):
	288	case OP(RDMA_WRITE_ONLY):
	289	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
	290	goto rdma_first;
	291
	292	default:
	293	goto drop;
	294	}
	295	}
	296
	297	/* Check for opcode sequence errors. */
	298	switch (qp->r_state) {
	299	case OP(SEND_FIRST):
	300	case OP(SEND_MIDDLE):
	301	if (opcode == OP(SEND_MIDDLE) \|\|
	302	opcode == OP(SEND_LAST) \|\|
	303	opcode == OP(SEND_LAST_WITH_IMMEDIATE))
	304	break;
	305	goto inv;
	306
	307	case OP(RDMA_WRITE_FIRST):
	308	case OP(RDMA_WRITE_MIDDLE):
	309	if (opcode == OP(RDMA_WRITE_MIDDLE) \|\|
	310	opcode == OP(RDMA_WRITE_LAST) \|\|
	311	opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
	312	break;
	313	goto inv;
	314
	315	default:
	316	if (opcode == OP(SEND_FIRST) \|\|
	317	opcode == OP(SEND_ONLY) \|\|
	318	opcode == OP(SEND_ONLY_WITH_IMMEDIATE) \|\|
	319	opcode == OP(RDMA_WRITE_FIRST) \|\|
	320	opcode == OP(RDMA_WRITE_ONLY) \|\|
	321	opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
	322	break;
	323	goto inv;
	324	}
	325
beb5a042 BW	326	if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
beb5a042 BW	327	rvt_comm_est(qp);
f931551b RC	328
	329	/* OK, process the packet. */
	330	switch (opcode) {
	331	case OP(SEND_FIRST):
	332	case OP(SEND_ONLY):
	333	case OP(SEND_ONLY_WITH_IMMEDIATE):
	334	send_first:
01ba79d4	335	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
f931551b RC	336	qp->r_sge = qp->s_rdma_read_sge;
f931551b RC	337	else {
832369fa	338	ret = rvt_get_rwqe(qp, false);
f931551b RC	339	if (ret < 0)
	340	goto op_err;
	341	if (!ret)
	342	goto drop;
	343	/*
	344	* qp->s_rdma_read_sge will be the owner
	345	* of the mr references.
	346	*/
	347	qp->s_rdma_read_sge = qp->r_sge;
	348	}
	349	qp->r_rcv_len = 0;
	350	if (opcode == OP(SEND_ONLY))
2fc109c8	351	goto no_immediate_data;
f931551b RC	352	else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
f931551b RC	353	goto send_last_imm;
df561f66	354	fallthrough;
f931551b RC	355	case OP(SEND_MIDDLE):
	356	/* Check for invalid length PMTU or posted rwqe len. */
	357	if (unlikely(tlen != (hdrsize + pmtu + 4)))
	358	goto rewind;
	359	qp->r_rcv_len += pmtu;
	360	if (unlikely(qp->r_rcv_len > qp->r_len))
	361	goto rewind;
019f118b	362	rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
f931551b RC	363	break;
	364
	365	case OP(SEND_LAST_WITH_IMMEDIATE):
	366	send_last_imm:
	367	wc.ex.imm_data = ohdr->u.imm_data;
	368	hdrsize += 4;
	369	wc.wc_flags = IB_WC_WITH_IMM;
2fc109c8	370	goto send_last;
f931551b	371	case OP(SEND_LAST):
2fc109c8 MM	372	no_immediate_data:
	373	wc.ex.imm_data = 0;
	374	wc.wc_flags = 0;
f931551b RC	375	send_last:
	376	/* Get the number of bytes the message was padded by. */
	377	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	378	/* Check for invalid length. */
	379	/* XXX LAST len should be >= 1 */
	380	if (unlikely(tlen < (hdrsize + pad + 4)))
	381	goto rewind;
	382	/* Don't count the CRC. */
	383	tlen -= (hdrsize + pad + 4);
	384	wc.byte_len = tlen + qp->r_rcv_len;
	385	if (unlikely(wc.byte_len > qp->r_len))
	386	goto rewind;
	387	wc.opcode = IB_WC_RECV;
019f118b	388	rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
70696ea7	389	rvt_put_ss(&qp->s_rdma_read_sge);
354dff1b	390	last_imm:
f931551b RC	391	wc.wr_id = qp->r_wr_id;
	392	wc.status = IB_WC_SUCCESS;
	393	wc.qp = &qp->ibqp;
	394	wc.src_qp = qp->remote_qpn;
d8966fcd DC	395	wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
d8966fcd DC	396	wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
2fc109c8 MM	397	/* zero fields that are N/A */
	398	wc.vendor_err = 0;
	399	wc.pkey_index = 0;
	400	wc.dlid_path_bits = 0;
	401	wc.port_num = 0;
f931551b	402	/* Signal completion event if the solicited bit is set. */
5136bfea	403	rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
f931551b RC	404	break;
	405
	406	case OP(RDMA_WRITE_FIRST):
	407	case OP(RDMA_WRITE_ONLY):
	408	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
	409	rdma_first:
	410	if (unlikely(!(qp->qp_access_flags &
	411	IB_ACCESS_REMOTE_WRITE))) {
	412	goto drop;
	413	}
	414	reth = &ohdr->u.rc.reth;
	415	hdrsize += sizeof(*reth);
	416	qp->r_len = be32_to_cpu(reth->length);
	417	qp->r_rcv_len = 0;
	418	qp->r_sge.sg_list = NULL;
	419	if (qp->r_len != 0) {
	420	u32 rkey = be32_to_cpu(reth->rkey);
	421	u64 vaddr = be64_to_cpu(reth->vaddr);
	422	int ok;
	423
	424	/* Check rkey */
7c2e11fe	425	ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
f931551b RC	426	vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
	427	if (unlikely(!ok))
	428	goto drop;
	429	qp->r_sge.num_sge = 1;
	430	} else {
	431	qp->r_sge.num_sge = 0;
	432	qp->r_sge.sge.mr = NULL;
	433	qp->r_sge.sge.vaddr = NULL;
	434	qp->r_sge.sge.length = 0;
	435	qp->r_sge.sge.sge_length = 0;
	436	}
	437	if (opcode == OP(RDMA_WRITE_ONLY))
	438	goto rdma_last;
5715f5d4 JG	439	else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
5715f5d4 JG	440	wc.ex.imm_data = ohdr->u.rc.imm_data;
f931551b	441	goto rdma_last_imm;
5715f5d4	442	}
df561f66	443	fallthrough;
f931551b RC	444	case OP(RDMA_WRITE_MIDDLE):
	445	/* Check for invalid length PMTU or posted rwqe len. */
	446	if (unlikely(tlen != (hdrsize + pmtu + 4)))
	447	goto drop;
	448	qp->r_rcv_len += pmtu;
	449	if (unlikely(qp->r_rcv_len > qp->r_len))
	450	goto drop;
019f118b	451	rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
f931551b RC	452	break;
	453
	454	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
f931551b	455	wc.ex.imm_data = ohdr->u.imm_data;
5715f5d4	456	rdma_last_imm:
f931551b RC	457	hdrsize += 4;
	458	wc.wc_flags = IB_WC_WITH_IMM;
	459
	460	/* Get the number of bytes the message was padded by. */
	461	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	462	/* Check for invalid length. */
	463	/* XXX LAST len should be >= 1 */
	464	if (unlikely(tlen < (hdrsize + pad + 4)))
	465	goto drop;
	466	/* Don't count the CRC. */
	467	tlen -= (hdrsize + pad + 4);
	468	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	469	goto drop;
01ba79d4	470	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
70696ea7	471	rvt_put_ss(&qp->s_rdma_read_sge);
f931551b	472	else {
832369fa	473	ret = rvt_get_rwqe(qp, true);
f931551b RC	474	if (ret < 0)
	475	goto op_err;
	476	if (!ret)
	477	goto drop;
	478	}
	479	wc.byte_len = qp->r_len;
	480	wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
019f118b	481	rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
70696ea7	482	rvt_put_ss(&qp->r_sge);
f931551b RC	483	goto last_imm;
	484
	485	case OP(RDMA_WRITE_LAST):
	486	rdma_last:
	487	/* Get the number of bytes the message was padded by. */
	488	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	489	/* Check for invalid length. */
	490	/* XXX LAST len should be >= 1 */
	491	if (unlikely(tlen < (hdrsize + pad + 4)))
	492	goto drop;
	493	/* Don't count the CRC. */
	494	tlen -= (hdrsize + pad + 4);
	495	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	496	goto drop;
019f118b	497	rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
70696ea7	498	rvt_put_ss(&qp->r_sge);
f931551b RC	499	break;
	500
	501	default:
	502	/* Drop packet for unknown opcodes. */
	503	goto drop;
	504	}
	505	qp->r_psn++;
	506	qp->r_state = opcode;
f931551b RC	507	return;
	508
	509	rewind:
01ba79d4	510	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
f931551b RC	511	qp->r_sge.num_sge = 0;
f931551b RC	512	drop:
f24a6d48	513	ibp->rvp.n_pkt_drops++;
f931551b RC	514	return;
	515
	516	op_err:
beb5a042	517	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
f931551b RC	518	return;
f931551b RC	519
f931551b	520	}