IB/ipath: infiniband UC and UD protocol support

These files implement the Infiniband UC ("unreliable connection") and UD
("unreliable datagram") protocols.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 645 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_uc.c b/drivers/infiniband/hw/ipath/ipath_uc.c
new file mode 100644
index 000000000000..0d6dbc0a541e
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_uc.c
@@ -0,0 +1,645 @@
+/*
+ * 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 "ipath_verbs.h"
+#include "ips_common.h"
+
+/* cut down ridiculously long IB macro names */
+#define OP(x) IB_OPCODE_UC_##x
+
+static void complete_last_send(struct ipath_qp *qp, struct ipath_swqe *wqe,
+			       struct ib_wc *wc)
+{
+	if (++qp->s_last == qp->s_size)
+		qp->s_last = 0;
+	if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
+	    (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
+		wc->wr_id = wqe->wr.wr_id;
+		wc->status = IB_WC_SUCCESS;
+		wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
+		wc->vendor_err = 0;
+		wc->byte_len = wqe->length;
+		wc->qp_num = qp->ibqp.qp_num;
+		wc->src_qp = qp->remote_qpn;
+		wc->pkey_index = 0;
+		wc->slid = qp->remote_ah_attr.dlid;
+		wc->sl = qp->remote_ah_attr.sl;
+		wc->dlid_path_bits = 0;
+		wc->port_num = 0;
+		ipath_cq_enter(to_icq(qp->ibqp.send_cq), wc, 0);
+	}
+	wqe = get_swqe_ptr(qp, qp->s_last);
+}
+
+/**
+ * ipath_do_uc_send - do a send on a UC queue
+ * @data: contains a pointer to the QP to send on
+ *
+ * Process entries in the send work queue until the queue is exhausted.
+ * Only allow one CPU to send a packet per QP (tasklet).
+ * Otherwise, after we drop the QP lock, two threads could send
+ * packets out of order.
+ * This is similar to ipath_do_rc_send() below except we don't have
+ * timeouts or resends.
+ */
+void ipath_do_uc_send(unsigned long data)
+{
+	struct ipath_qp *qp = (struct ipath_qp *)data;
+	struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
+	struct ipath_swqe *wqe;
+	unsigned long flags;
+	u16 lrh0;
+	u32 hwords;
+	u32 nwords;
+	u32 extra_bytes;
+	u32 bth0;
+	u32 bth2;
+	u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
+	u32 len;
+	struct ipath_other_headers *ohdr;
+	struct ib_wc wc;
+
+	if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
+		goto bail;
+
+	if (unlikely(qp->remote_ah_attr.dlid ==
+		     ipath_layer_get_lid(dev->dd))) {
+		/* Pass in an uninitialized ib_wc to save stack space. */
+		ipath_ruc_loopback(qp, &wc);
+		clear_bit(IPATH_S_BUSY, &qp->s_flags);
+		goto bail;
+	}
+
+	ohdr = &qp->s_hdr.u.oth;
+	if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
+		ohdr = &qp->s_hdr.u.l.oth;
+
+again:
+	/* Check for a constructed packet to be sent. */
+	if (qp->s_hdrwords != 0) {
+			/*
+			 * If no PIO bufs are available, return.
+			 * An interrupt will call ipath_ib_piobufavail()
+			 * when one is available.
+			 */
+			if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
+					     (u32 *) &qp->s_hdr,
+					     qp->s_cur_size,
+					     qp->s_cur_sge)) {
+				ipath_no_bufs_available(qp, dev);
+				goto bail;
+			}
+			dev->n_unicast_xmit++;
+		/* Record that we sent the packet and s_hdr is empty. */
+		qp->s_hdrwords = 0;
+	}
+
+	lrh0 = IPS_LRH_BTH;
+	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
+	hwords = 5;
+
+	/*
+	 * The lock is needed to synchronize between
+	 * setting qp->s_ack_state and post_send().
+	 */
+	spin_lock_irqsave(&qp->s_lock, flags);
+
+	if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK))
+		goto done;
+
+	bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
+
+	/* Send a request. */
+	wqe = get_swqe_ptr(qp, qp->s_last);
+	switch (qp->s_state) {
+	default:
+		/*
+		 * Signal the completion of the last send (if there is
+		 * one).
+		 */
+		if (qp->s_last != qp->s_tail)
+			complete_last_send(qp, wqe, &wc);
+
+		/* Check if send work queue is empty. */
+		if (qp->s_tail == qp->s_head)
+			goto done;
+		/*
+		 * Start a new request.
+		 */
+		qp->s_psn = wqe->psn = qp->s_next_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_len = len = wqe->length;
+		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.imm_data;
+				hwords += 1;
+			}
+			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
+				bth0 |= 1 << 23;
+			break;
+
+		case IB_WR_RDMA_WRITE:
+		case IB_WR_RDMA_WRITE_WITH_IMM:
+			ohdr->u.rc.reth.vaddr =
+				cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
+			ohdr->u.rc.reth.rkey =
+				cpu_to_be32(wqe->wr.wr.rdma.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.imm_data;
+				hwords += 1;
+				if (wqe->wr.send_flags & IB_SEND_SOLICITED)
+					bth0 |= 1 << 23;
+			}
+			break;
+
+		default:
+			goto done;
+		}
+		if (++qp->s_tail >= qp->s_size)
+			qp->s_tail = 0;
+		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.imm_data;
+			hwords += 1;
+		}
+		if (wqe->wr.send_flags & IB_SEND_SOLICITED)
+			bth0 |= 1 << 23;
+		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.imm_data;
+			hwords += 1;
+			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
+				bth0 |= 1 << 23;
+		}
+		break;
+	}
+	bth2 = qp->s_next_psn++ & IPS_PSN_MASK;
+	qp->s_len -= len;
+	bth0 |= qp->s_state << 24;
+
+	spin_unlock_irqrestore(&qp->s_lock, flags);
+
+	/* Construct the header. */
+	extra_bytes = (4 - len) & 3;
+	nwords = (len + extra_bytes) >> 2;
+	if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
+		/* Header size in 32-bit words. */
+		hwords += 10;
+		lrh0 = IPS_LRH_GRH;
+		qp->s_hdr.u.l.grh.version_tclass_flow =
+			cpu_to_be32((6 << 28) |
+				    (qp->remote_ah_attr.grh.traffic_class
+				     << 20) |
+				    qp->remote_ah_attr.grh.flow_label);
+		qp->s_hdr.u.l.grh.paylen =
+			cpu_to_be16(((hwords - 12) + nwords +
+				     SIZE_OF_CRC) << 2);
+		/* next_hdr is defined by C8-7 in ch. 8.4.1 */
+		qp->s_hdr.u.l.grh.next_hdr = 0x1B;
+		qp->s_hdr.u.l.grh.hop_limit =
+			qp->remote_ah_attr.grh.hop_limit;
+		/* The SGID is 32-bit aligned. */
+		qp->s_hdr.u.l.grh.sgid.global.subnet_prefix =
+			dev->gid_prefix;
+		qp->s_hdr.u.l.grh.sgid.global.interface_id =
+			ipath_layer_get_guid(dev->dd);
+		qp->s_hdr.u.l.grh.dgid = qp->remote_ah_attr.grh.dgid;
+	}
+	qp->s_hdrwords = hwords;
+	qp->s_cur_sge = &qp->s_sge;
+	qp->s_cur_size = len;
+	lrh0 |= qp->remote_ah_attr.sl << 4;
+	qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
+	/* DEST LID */
+	qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
+	qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC);
+	qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
+	bth0 |= extra_bytes << 20;
+	ohdr->bth[0] = cpu_to_be32(bth0);
+	ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
+	ohdr->bth[2] = cpu_to_be32(bth2);
+
+	/* Check for more work to do. */
+	goto again;
+
+done:
+	spin_unlock_irqrestore(&qp->s_lock, flags);
+	clear_bit(IPATH_S_BUSY, &qp->s_flags);
+
+bail:
+	return;
+}
+
+/**
+ * ipath_uc_rcv - handle an incoming UC packet
+ * @dev: the device 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 ipath_qp_rcv() to process an incoming UC packet
+ * for the given QP.
+ * Called at interrupt level.
+ */
+void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
+		  int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
+{
+	struct ipath_other_headers *ohdr;
+	int opcode;
+	u32 hdrsize;
+	u32 psn;
+	u32 pad;
+	unsigned long flags;
+	struct ib_wc wc;
+	u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
+	struct ib_reth *reth;
+	int header_in_data;
+
+	/* Check for GRH */
+	if (!has_grh) {
+		ohdr = &hdr->u.oth;
+		hdrsize = 8 + 12;	/* LRH + BTH */
+		psn = be32_to_cpu(ohdr->bth[2]);
+		header_in_data = 0;
+	} else {
+		ohdr = &hdr->u.l.oth;
+		hdrsize = 8 + 40 + 12;	/* LRH + GRH + BTH */
+		/*
+		 * The header with GRH is 60 bytes and the
+		 * core driver sets the eager header buffer
+		 * size to 56 bytes so the last 4 bytes of
+		 * the BTH header (PSN) is in the data buffer.
+		 */
+		header_in_data =
+			ipath_layer_get_rcvhdrentsize(dev->dd) == 16;
+		if (header_in_data) {
+			psn = be32_to_cpu(((__be32 *) data)[0]);
+			data += sizeof(__be32);
+		} else
+			psn = be32_to_cpu(ohdr->bth[2]);
+	}
+	/*
+	 * The opcode is in the low byte when its in network order
+	 * (top byte when in host order).
+	 */
+	opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
+
+	wc.imm_data = 0;
+	wc.wc_flags = 0;
+
+	spin_lock_irqsave(&qp->r_rq.lock, flags);
+
+	/* Compare the PSN verses the expected PSN. */
+	if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
+		/*
+		 * Handle a sequence error.
+		 * Silently drop any current message.
+		 */
+		qp->r_psn = psn;
+	inv:
+		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:
+			dev->n_pkt_drops++;
+			goto done;
+		}
+	}
+
+	/* 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;
+	}
+
+	/* OK, process the packet. */
+	switch (opcode) {
+	case OP(SEND_FIRST):
+	case OP(SEND_ONLY):
+	case OP(SEND_ONLY_WITH_IMMEDIATE):
+	send_first:
+		if (qp->r_reuse_sge) {
+			qp->r_reuse_sge = 0;
+			qp->r_sge = qp->s_rdma_sge;
+		} else if (!ipath_get_rwqe(qp, 0)) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		/* Save the WQE so we can reuse it in case of an error. */
+		qp->s_rdma_sge = qp->r_sge;
+		qp->r_rcv_len = 0;
+		if (opcode == OP(SEND_ONLY))
+			goto send_last;
+		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))) {
+			qp->r_reuse_sge = 1;
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		qp->r_rcv_len += pmtu;
+		if (unlikely(qp->r_rcv_len > qp->r_len)) {
+			qp->r_reuse_sge = 1;
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		ipath_copy_sge(&qp->r_sge, data, pmtu);
+		break;
+
+	case OP(SEND_LAST_WITH_IMMEDIATE):
+	send_last_imm:
+		if (header_in_data) {
+			wc.imm_data = *(__be32 *) data;
+			data += sizeof(__be32);
+		} else {
+			/* Immediate data comes after BTH */
+			wc.imm_data = ohdr->u.imm_data;
+		}
+		hdrsize += 4;
+		wc.wc_flags = IB_WC_WITH_IMM;
+		/* FALLTHROUGH */
+	case OP(SEND_LAST):
+	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))) {
+			qp->r_reuse_sge = 1;
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		/* 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)) {
+			qp->r_reuse_sge = 1;
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		/* XXX Need to free SGEs */
+	last_imm:
+		ipath_copy_sge(&qp->r_sge, data, tlen);
+		wc.wr_id = qp->r_wr_id;
+		wc.status = IB_WC_SUCCESS;
+		wc.opcode = IB_WC_RECV;
+		wc.vendor_err = 0;
+		wc.qp_num = qp->ibqp.qp_num;
+		wc.src_qp = qp->remote_qpn;
+		wc.pkey_index = 0;
+		wc.slid = qp->remote_ah_attr.dlid;
+		wc.sl = qp->remote_ah_attr.sl;
+		wc.dlid_path_bits = 0;
+		wc.port_num = 0;
+		/* Signal completion event if the solicited bit is set. */
+		ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+			       (ohdr->bth[0] &
+				__constant_cpu_to_be32(1 << 23)) != 0);
+		break;
+
+	case OP(RDMA_WRITE_FIRST):
+	case OP(RDMA_WRITE_ONLY):
+	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
+	rdma_first:
+		/* RETH comes after BTH */
+		if (!header_in_data)
+			reth = &ohdr->u.rc.reth;
+		else {
+			reth = (struct ib_reth *)data;
+			data += sizeof(*reth);
+		}
+		hdrsize += sizeof(*reth);
+		qp->r_len = be32_to_cpu(reth->length);
+		qp->r_rcv_len = 0;
+		if (qp->r_len != 0) {
+			u32 rkey = be32_to_cpu(reth->rkey);
+			u64 vaddr = be64_to_cpu(reth->vaddr);
+
+			/* Check rkey */
+			if (unlikely(!ipath_rkey_ok(
+					     dev, &qp->r_sge, qp->r_len,
+					     vaddr, rkey,
+					     IB_ACCESS_REMOTE_WRITE))) {
+				dev->n_pkt_drops++;
+				goto done;
+			}
+		} else {
+			qp->r_sge.sg_list = NULL;
+			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 (unlikely(!(qp->qp_access_flags &
+			       IB_ACCESS_REMOTE_WRITE))) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		if (opcode == OP(RDMA_WRITE_ONLY))
+			goto rdma_last;
+		else if (opcode ==
+			 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
+			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))) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		qp->r_rcv_len += pmtu;
+		if (unlikely(qp->r_rcv_len > qp->r_len)) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		ipath_copy_sge(&qp->r_sge, data, pmtu);
+		break;
+
+	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
+	rdma_last_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))) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		/* Don't count the CRC. */
+		tlen -= (hdrsize + pad + 4);
+		if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		if (qp->r_reuse_sge) {
+			qp->r_reuse_sge = 0;
+		} else if (!ipath_get_rwqe(qp, 1)) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		if (header_in_data) {
+			wc.imm_data = *(__be32 *) data;
+			data += sizeof(__be32);
+		} else {
+			/* Immediate data comes after BTH */
+			wc.imm_data = ohdr->u.imm_data;
+		}
+		hdrsize += 4;
+		wc.wc_flags = IB_WC_WITH_IMM;
+		wc.byte_len = 0;
+		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))) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		/* Don't count the CRC. */
+		tlen -= (hdrsize + pad + 4);
+		if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
+			dev->n_pkt_drops++;
+			goto done;
+		}
+		ipath_copy_sge(&qp->r_sge, data, tlen);
+		break;
+
+	default:
+		/* Drop packet for unknown opcodes. */
+		spin_unlock_irqrestore(&qp->r_rq.lock, flags);
+		dev->n_pkt_drops++;
+		goto bail;
+	}
+	qp->r_psn++;
+	qp->r_state = opcode;
+done:
+	spin_unlock_irqrestore(&qp->r_rq.lock, flags);
+
+bail:
+	return;
+}