[linux-2.6-block.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
 * @flags: unused
 *
 * 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
f8005fa8	43	* @flags: unused
f931551b	44	*
46a80d62 MM	45	* Assumes the s_lock is held.
46a80d62 MM	46	*
f931551b RC	47	* Return 1 if constructed; otherwise, return 0.
f931551b RC	48	*/
747f4d7a	49	int qib_make_uc_req(struct rvt_qp qp, unsigned long flags)
f931551b	50	{
ffc26907	51	struct qib_qp_priv *priv = qp->priv;
261a4351	52	struct ib_other_headers *ohdr;
7c2e11fe	53	struct rvt_swqe *wqe;
f931551b RC	54	u32 hwords;
	55	u32 bth0;
	56	u32 len;
cc6ea138	57	u32 pmtu = qp->pmtu;
f931551b RC	58	int ret = 0;
f931551b RC	59
db3ef0eb HC	60	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
db3ef0eb HC	61	if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
f931551b RC	62	goto bail;
f931551b RC	63	/* We are in the error state, flush the work request. */
6aa7de05	64	if (qp->s_last == READ_ONCE(qp->s_head))
f931551b RC	65	goto bail;
f931551b RC	66	/* If DMAs are in progress, we can't flush immediately. */
ffc26907	67	if (atomic_read(&priv->s_dma_busy)) {
01ba79d4	68	qp->s_flags \|= RVT_S_WAIT_DMA;
f931551b RC	69	goto bail;
f931551b RC	70	}
db3ef0eb	71	wqe = rvt_get_swqe_ptr(qp, qp->s_last);
116aa033	72	rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
f931551b RC	73	goto done;
	74	}
	75
ffc26907	76	ohdr = &priv->s_hdr->u.oth;
d8966fcd	77	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
ffc26907	78	ohdr = &priv->s_hdr->u.l.oth;
f931551b RC	79
	80	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
	81	hwords = 5;
	82	bth0 = 0;
	83
	84	/* Get the next send request. */
db3ef0eb	85	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
f931551b RC	86	qp->s_wqe = NULL;
	87	switch (qp->s_state) {
	88	default:
db3ef0eb HC	89	if (!(ib_rvt_state_ops[qp->state] &
db3ef0eb HC	90	RVT_PROCESS_NEXT_SEND_OK))
f931551b RC	91	goto bail;
f931551b RC	92	/* Check if send work queue is empty. */
6aa7de05	93	if (qp->s_cur == READ_ONCE(qp->s_head))
f931551b RC	94	goto bail;
	95	/*
	96	* Start a new request.
	97	*/
46a80d62	98	qp->s_psn = wqe->psn;
f931551b RC	99	qp->s_sge.sge = wqe->sg_list[0];
	100	qp->s_sge.sg_list = wqe->sg_list + 1;
	101	qp->s_sge.num_sge = wqe->wr.num_sge;
	102	qp->s_sge.total_len = wqe->length;
	103	len = wqe->length;
	104	qp->s_len = len;
	105	switch (wqe->wr.opcode) {
	106	case IB_WR_SEND:
	107	case IB_WR_SEND_WITH_IMM:
	108	if (len > pmtu) {
	109	qp->s_state = OP(SEND_FIRST);
	110	len = pmtu;
	111	break;
	112	}
	113	if (wqe->wr.opcode == IB_WR_SEND)
	114	qp->s_state = OP(SEND_ONLY);
	115	else {
	116	qp->s_state =
	117	OP(SEND_ONLY_WITH_IMMEDIATE);
	118	/* Immediate data comes after the BTH */
	119	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	120	hwords += 1;
	121	}
	122	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	123	bth0 \|= IB_BTH_SOLICITED;
	124	qp->s_wqe = wqe;
	125	if (++qp->s_cur >= qp->s_size)
	126	qp->s_cur = 0;
	127	break;
	128
	129	case IB_WR_RDMA_WRITE:
	130	case IB_WR_RDMA_WRITE_WITH_IMM:
	131	ohdr->u.rc.reth.vaddr =
e622f2f4	132	cpu_to_be64(wqe->rdma_wr.remote_addr);
f931551b	133	ohdr->u.rc.reth.rkey =
e622f2f4	134	cpu_to_be32(wqe->rdma_wr.rkey);
f931551b RC	135	ohdr->u.rc.reth.length = cpu_to_be32(len);
	136	hwords += sizeof(struct ib_reth) / 4;
	137	if (len > pmtu) {
	138	qp->s_state = OP(RDMA_WRITE_FIRST);
	139	len = pmtu;
	140	break;
	141	}
	142	if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
	143	qp->s_state = OP(RDMA_WRITE_ONLY);
	144	else {
	145	qp->s_state =
	146	OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
	147	/* Immediate data comes after the RETH */
	148	ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
	149	hwords += 1;
	150	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	151	bth0 \|= IB_BTH_SOLICITED;
	152	}
	153	qp->s_wqe = wqe;
	154	if (++qp->s_cur >= qp->s_size)
	155	qp->s_cur = 0;
	156	break;
	157
	158	default:
	159	goto bail;
	160	}
	161	break;
	162
	163	case OP(SEND_FIRST):
	164	qp->s_state = OP(SEND_MIDDLE);
df561f66	165	fallthrough;
f931551b RC	166	case OP(SEND_MIDDLE):
	167	len = qp->s_len;
	168	if (len > pmtu) {
	169	len = pmtu;
	170	break;
	171	}
	172	if (wqe->wr.opcode == IB_WR_SEND)
	173	qp->s_state = OP(SEND_LAST);
	174	else {
	175	qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
	176	/* Immediate data comes after the BTH */
	177	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	178	hwords += 1;
	179	}
	180	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	181	bth0 \|= IB_BTH_SOLICITED;
	182	qp->s_wqe = wqe;
	183	if (++qp->s_cur >= qp->s_size)
	184	qp->s_cur = 0;
	185	break;
	186
	187	case OP(RDMA_WRITE_FIRST):
	188	qp->s_state = OP(RDMA_WRITE_MIDDLE);
df561f66	189	fallthrough;
f931551b RC	190	case OP(RDMA_WRITE_MIDDLE):
	191	len = qp->s_len;
	192	if (len > pmtu) {
	193	len = pmtu;
	194	break;
	195	}
	196	if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
	197	qp->s_state = OP(RDMA_WRITE_LAST);
	198	else {
	199	qp->s_state =
	200	OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
	201	/* Immediate data comes after the BTH */
	202	ohdr->u.imm_data = wqe->wr.ex.imm_data;
	203	hwords += 1;
	204	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
	205	bth0 \|= IB_BTH_SOLICITED;
	206	}
	207	qp->s_wqe = wqe;
	208	if (++qp->s_cur >= qp->s_size)
	209	qp->s_cur = 0;
	210	break;
	211	}
	212	qp->s_len -= len;
	213	qp->s_hdrwords = hwords;
	214	qp->s_cur_sge = &qp->s_sge;
	215	qp->s_cur_size = len;
	216	qib_make_ruc_header(qp, ohdr, bth0 \| (qp->s_state << 24),
46a80d62	217	qp->s_psn++ & QIB_PSN_MASK);
f931551b	218	done:
46a80d62	219	return 1;
f931551b	220	bail:
01ba79d4	221	qp->s_flags &= ~RVT_S_BUSY;
f931551b RC	222	return ret;
	223	}
	224
	225	/**
	226	* qib_uc_rcv - handle an incoming UC packet
	227	* @ibp: the port the packet came in on
	228	* @hdr: the header of the packet
	229	* @has_grh: true if the packet has a GRH
	230	* @data: the packet data
	231	* @tlen: the length of the packet
	232	* @qp: the QP for this packet.
	233	*
	234	* This is called from qib_qp_rcv() to process an incoming UC packet
	235	* for the given QP.
	236	* Called at interrupt level.
	237	*/
261a4351	238	void qib_uc_rcv(struct qib_ibport ibp, struct ib_header hdr,
7c2e11fe	239	int has_grh, void data, u32 tlen, struct rvt_qp qp)
f931551b	240	{
261a4351	241	struct ib_other_headers *ohdr;
f931551b RC	242	u32 opcode;
	243	u32 hdrsize;
	244	u32 psn;
	245	u32 pad;
	246	struct ib_wc wc;
cc6ea138	247	u32 pmtu = qp->pmtu;
f931551b RC	248	struct ib_reth *reth;
	249	int ret;
	250
	251	/* Check for GRH */
	252	if (!has_grh) {
	253	ohdr = &hdr->u.oth;
	254	hdrsize = 8 + 12; /* LRH + BTH */
	255	} else {
	256	ohdr = &hdr->u.l.oth;
	257	hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
	258	}
	259
	260	opcode = be32_to_cpu(ohdr->bth[0]);
f931551b	261	if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
9fd5473d	262	return;
f931551b RC	263
	264	psn = be32_to_cpu(ohdr->bth[2]);
	265	opcode >>= 24;
f931551b	266
f931551b RC	267	/* Compare the PSN verses the expected PSN. */
	268	if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
	269	/*
	270	* Handle a sequence error.
	271	* Silently drop any current message.
	272	*/
	273	qp->r_psn = psn;
	274	inv:
	275	if (qp->r_state == OP(SEND_FIRST) \|\|
	276	qp->r_state == OP(SEND_MIDDLE)) {
01ba79d4	277	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
f931551b RC	278	qp->r_sge.num_sge = 0;
f931551b RC	279	} else
70696ea7	280	rvt_put_ss(&qp->r_sge);
f931551b RC	281	qp->r_state = OP(SEND_LAST);
	282	switch (opcode) {
	283	case OP(SEND_FIRST):
	284	case OP(SEND_ONLY):
	285	case OP(SEND_ONLY_WITH_IMMEDIATE):
	286	goto send_first;
	287
	288	case OP(RDMA_WRITE_FIRST):
	289	case OP(RDMA_WRITE_ONLY):
	290	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
	291	goto rdma_first;
	292
	293	default:
	294	goto drop;
	295	}
	296	}
	297
	298	/* Check for opcode sequence errors. */
	299	switch (qp->r_state) {
	300	case OP(SEND_FIRST):
	301	case OP(SEND_MIDDLE):
	302	if (opcode == OP(SEND_MIDDLE) \|\|
	303	opcode == OP(SEND_LAST) \|\|
	304	opcode == OP(SEND_LAST_WITH_IMMEDIATE))
	305	break;
	306	goto inv;
	307
	308	case OP(RDMA_WRITE_FIRST):
	309	case OP(RDMA_WRITE_MIDDLE):
	310	if (opcode == OP(RDMA_WRITE_MIDDLE) \|\|
	311	opcode == OP(RDMA_WRITE_LAST) \|\|
	312	opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
	313	break;
	314	goto inv;
	315
	316	default:
	317	if (opcode == OP(SEND_FIRST) \|\|
	318	opcode == OP(SEND_ONLY) \|\|
	319	opcode == OP(SEND_ONLY_WITH_IMMEDIATE) \|\|
	320	opcode == OP(RDMA_WRITE_FIRST) \|\|
	321	opcode == OP(RDMA_WRITE_ONLY) \|\|
	322	opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
	323	break;
	324	goto inv;
	325	}
	326
beb5a042 BW	327	if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
beb5a042 BW	328	rvt_comm_est(qp);
f931551b RC	329
	330	/* OK, process the packet. */
	331	switch (opcode) {
	332	case OP(SEND_FIRST):
	333	case OP(SEND_ONLY):
	334	case OP(SEND_ONLY_WITH_IMMEDIATE):
	335	send_first:
01ba79d4	336	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
f931551b RC	337	qp->r_sge = qp->s_rdma_read_sge;
f931551b RC	338	else {
832369fa	339	ret = rvt_get_rwqe(qp, false);
f931551b RC	340	if (ret < 0)
	341	goto op_err;
	342	if (!ret)
	343	goto drop;
	344	/*
	345	* qp->s_rdma_read_sge will be the owner
	346	* of the mr references.
	347	*/
	348	qp->s_rdma_read_sge = qp->r_sge;
	349	}
	350	qp->r_rcv_len = 0;
	351	if (opcode == OP(SEND_ONLY))
2fc109c8	352	goto no_immediate_data;
f931551b RC	353	else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
f931551b RC	354	goto send_last_imm;
df561f66	355	fallthrough;
f931551b RC	356	case OP(SEND_MIDDLE):
	357	/* Check for invalid length PMTU or posted rwqe len. */
	358	if (unlikely(tlen != (hdrsize + pmtu + 4)))
	359	goto rewind;
	360	qp->r_rcv_len += pmtu;
	361	if (unlikely(qp->r_rcv_len > qp->r_len))
	362	goto rewind;
019f118b	363	rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
f931551b RC	364	break;
	365
	366	case OP(SEND_LAST_WITH_IMMEDIATE):
	367	send_last_imm:
	368	wc.ex.imm_data = ohdr->u.imm_data;
	369	hdrsize += 4;
	370	wc.wc_flags = IB_WC_WITH_IMM;
2fc109c8	371	goto send_last;
f931551b	372	case OP(SEND_LAST):
2fc109c8 MM	373	no_immediate_data:
	374	wc.ex.imm_data = 0;
	375	wc.wc_flags = 0;
f931551b RC	376	send_last:
	377	/* Get the number of bytes the message was padded by. */
	378	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	379	/* Check for invalid length. */
	380	/* XXX LAST len should be >= 1 */
	381	if (unlikely(tlen < (hdrsize + pad + 4)))
	382	goto rewind;
	383	/* Don't count the CRC. */
	384	tlen -= (hdrsize + pad + 4);
	385	wc.byte_len = tlen + qp->r_rcv_len;
	386	if (unlikely(wc.byte_len > qp->r_len))
	387	goto rewind;
	388	wc.opcode = IB_WC_RECV;
019f118b	389	rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
70696ea7	390	rvt_put_ss(&qp->s_rdma_read_sge);
354dff1b	391	last_imm:
f931551b RC	392	wc.wr_id = qp->r_wr_id;
	393	wc.status = IB_WC_SUCCESS;
	394	wc.qp = &qp->ibqp;
	395	wc.src_qp = qp->remote_qpn;
d8966fcd DC	396	wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
d8966fcd DC	397	wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
2fc109c8 MM	398	/* zero fields that are N/A */
	399	wc.vendor_err = 0;
	400	wc.pkey_index = 0;
	401	wc.dlid_path_bits = 0;
	402	wc.port_num = 0;
f931551b	403	/* Signal completion event if the solicited bit is set. */
5136bfea	404	rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
f931551b RC	405	break;
	406
	407	case OP(RDMA_WRITE_FIRST):
	408	case OP(RDMA_WRITE_ONLY):
	409	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
	410	rdma_first:
	411	if (unlikely(!(qp->qp_access_flags &
	412	IB_ACCESS_REMOTE_WRITE))) {
	413	goto drop;
	414	}
	415	reth = &ohdr->u.rc.reth;
	416	hdrsize += sizeof(*reth);
	417	qp->r_len = be32_to_cpu(reth->length);
	418	qp->r_rcv_len = 0;
	419	qp->r_sge.sg_list = NULL;
	420	if (qp->r_len != 0) {
	421	u32 rkey = be32_to_cpu(reth->rkey);
	422	u64 vaddr = be64_to_cpu(reth->vaddr);
	423	int ok;
	424
	425	/* Check rkey */
7c2e11fe	426	ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
f931551b RC	427	vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
	428	if (unlikely(!ok))
	429	goto drop;
	430	qp->r_sge.num_sge = 1;
	431	} else {
	432	qp->r_sge.num_sge = 0;
	433	qp->r_sge.sge.mr = NULL;
	434	qp->r_sge.sge.vaddr = NULL;
	435	qp->r_sge.sge.length = 0;
	436	qp->r_sge.sge.sge_length = 0;
	437	}
	438	if (opcode == OP(RDMA_WRITE_ONLY))
	439	goto rdma_last;
5715f5d4 JG	440	else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
5715f5d4 JG	441	wc.ex.imm_data = ohdr->u.rc.imm_data;
f931551b	442	goto rdma_last_imm;
5715f5d4	443	}
df561f66	444	fallthrough;
f931551b RC	445	case OP(RDMA_WRITE_MIDDLE):
	446	/* Check for invalid length PMTU or posted rwqe len. */
	447	if (unlikely(tlen != (hdrsize + pmtu + 4)))
	448	goto drop;
	449	qp->r_rcv_len += pmtu;
	450	if (unlikely(qp->r_rcv_len > qp->r_len))
	451	goto drop;
019f118b	452	rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
f931551b RC	453	break;
	454
	455	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
f931551b	456	wc.ex.imm_data = ohdr->u.imm_data;
5715f5d4	457	rdma_last_imm:
f931551b RC	458	hdrsize += 4;
	459	wc.wc_flags = IB_WC_WITH_IMM;
	460
	461	/* Get the number of bytes the message was padded by. */
	462	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	463	/* Check for invalid length. */
	464	/* XXX LAST len should be >= 1 */
	465	if (unlikely(tlen < (hdrsize + pad + 4)))
	466	goto drop;
	467	/* Don't count the CRC. */
	468	tlen -= (hdrsize + pad + 4);
	469	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	470	goto drop;
01ba79d4	471	if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
70696ea7	472	rvt_put_ss(&qp->s_rdma_read_sge);
f931551b	473	else {
832369fa	474	ret = rvt_get_rwqe(qp, true);
f931551b RC	475	if (ret < 0)
	476	goto op_err;
	477	if (!ret)
	478	goto drop;
	479	}
	480	wc.byte_len = qp->r_len;
	481	wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
019f118b	482	rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
70696ea7	483	rvt_put_ss(&qp->r_sge);
f931551b RC	484	goto last_imm;
	485
	486	case OP(RDMA_WRITE_LAST):
	487	rdma_last:
	488	/* Get the number of bytes the message was padded by. */
	489	pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
	490	/* Check for invalid length. */
	491	/* XXX LAST len should be >= 1 */
	492	if (unlikely(tlen < (hdrsize + pad + 4)))
	493	goto drop;
	494	/* Don't count the CRC. */
	495	tlen -= (hdrsize + pad + 4);
	496	if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
	497	goto drop;
019f118b	498	rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
70696ea7	499	rvt_put_ss(&qp->r_sge);
f931551b RC	500	break;
	501
	502	default:
	503	/* Drop packet for unknown opcodes. */
	504	goto drop;
	505	}
	506	qp->r_psn++;
	507	qp->r_state = opcode;
f931551b RC	508	return;
	509
	510	rewind:
01ba79d4	511	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
f931551b RC	512	qp->r_sge.num_sge = 0;
f931551b RC	513	drop:
f24a6d48	514	ibp->rvp.n_pkt_drops++;
f931551b RC	515	return;
	516
	517	op_err:
beb5a042	518	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
f931551b RC	519	return;
f931551b RC	520
f931551b	521	}