Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1082 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/cxgb3/iwch_qp.c b/drivers/infiniband/hw/cxgb3/iwch_qp.c
new file mode 100644
index 000000000..c649faad6
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb3/iwch_qp.c
@@ -0,0 +1,1082 @@
+/*
+ * Copyright (c) 2006 Chelsio, 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 <linux/sched.h>
+#include <linux/gfp.h>
+#include "iwch_provider.h"
+#include "iwch.h"
+#include "iwch_cm.h"
+#include "cxio_hal.h"
+#include "cxio_resource.h"
+
+#define NO_SUPPORT -1
+
+static int build_rdma_send(union t3_wr *wqe, const struct ib_send_wr *wr,
+			   u8 *flit_cnt)
+{
+	int i;
+	u32 plen;
+
+	switch (wr->opcode) {
+	case IB_WR_SEND:
+		if (wr->send_flags & IB_SEND_SOLICITED)
+			wqe->send.rdmaop = T3_SEND_WITH_SE;
+		else
+			wqe->send.rdmaop = T3_SEND;
+		wqe->send.rem_stag = 0;
+		break;
+	case IB_WR_SEND_WITH_INV:
+		if (wr->send_flags & IB_SEND_SOLICITED)
+			wqe->send.rdmaop = T3_SEND_WITH_SE_INV;
+		else
+			wqe->send.rdmaop = T3_SEND_WITH_INV;
+		wqe->send.rem_stag = cpu_to_be32(wr->ex.invalidate_rkey);
+		break;
+	default:
+		return -EINVAL;
+	}
+	if (wr->num_sge > T3_MAX_SGE)
+		return -EINVAL;
+	wqe->send.reserved[0] = 0;
+	wqe->send.reserved[1] = 0;
+	wqe->send.reserved[2] = 0;
+	plen = 0;
+	for (i = 0; i < wr->num_sge; i++) {
+		if ((plen + wr->sg_list[i].length) < plen)
+			return -EMSGSIZE;
+
+		plen += wr->sg_list[i].length;
+		wqe->send.sgl[i].stag = cpu_to_be32(wr->sg_list[i].lkey);
+		wqe->send.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
+		wqe->send.sgl[i].to = cpu_to_be64(wr->sg_list[i].addr);
+	}
+	wqe->send.num_sgle = cpu_to_be32(wr->num_sge);
+	*flit_cnt = 4 + ((wr->num_sge) << 1);
+	wqe->send.plen = cpu_to_be32(plen);
+	return 0;
+}
+
+static int build_rdma_write(union t3_wr *wqe, const struct ib_send_wr *wr,
+			    u8 *flit_cnt)
+{
+	int i;
+	u32 plen;
+	if (wr->num_sge > T3_MAX_SGE)
+		return -EINVAL;
+	wqe->write.rdmaop = T3_RDMA_WRITE;
+	wqe->write.reserved[0] = 0;
+	wqe->write.reserved[1] = 0;
+	wqe->write.reserved[2] = 0;
+	wqe->write.stag_sink = cpu_to_be32(rdma_wr(wr)->rkey);
+	wqe->write.to_sink = cpu_to_be64(rdma_wr(wr)->remote_addr);
+
+	if (wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
+		plen = 4;
+		wqe->write.sgl[0].stag = wr->ex.imm_data;
+		wqe->write.sgl[0].len = cpu_to_be32(0);
+		wqe->write.num_sgle = cpu_to_be32(0);
+		*flit_cnt = 6;
+	} else {
+		plen = 0;
+		for (i = 0; i < wr->num_sge; i++) {
+			if ((plen + wr->sg_list[i].length) < plen) {
+				return -EMSGSIZE;
+			}
+			plen += wr->sg_list[i].length;
+			wqe->write.sgl[i].stag =
+			    cpu_to_be32(wr->sg_list[i].lkey);
+			wqe->write.sgl[i].len =
+			    cpu_to_be32(wr->sg_list[i].length);
+			wqe->write.sgl[i].to =
+			    cpu_to_be64(wr->sg_list[i].addr);
+		}
+		wqe->write.num_sgle = cpu_to_be32(wr->num_sge);
+		*flit_cnt = 5 + ((wr->num_sge) << 1);
+	}
+	wqe->write.plen = cpu_to_be32(plen);
+	return 0;
+}
+
+static int build_rdma_read(union t3_wr *wqe, const struct ib_send_wr *wr,
+			   u8 *flit_cnt)
+{
+	if (wr->num_sge > 1)
+		return -EINVAL;
+	wqe->read.rdmaop = T3_READ_REQ;
+	if (wr->opcode == IB_WR_RDMA_READ_WITH_INV)
+		wqe->read.local_inv = 1;
+	else
+		wqe->read.local_inv = 0;
+	wqe->read.reserved[0] = 0;
+	wqe->read.reserved[1] = 0;
+	wqe->read.rem_stag = cpu_to_be32(rdma_wr(wr)->rkey);
+	wqe->read.rem_to = cpu_to_be64(rdma_wr(wr)->remote_addr);
+	wqe->read.local_stag = cpu_to_be32(wr->sg_list[0].lkey);
+	wqe->read.local_len = cpu_to_be32(wr->sg_list[0].length);
+	wqe->read.local_to = cpu_to_be64(wr->sg_list[0].addr);
+	*flit_cnt = sizeof(struct t3_rdma_read_wr) >> 3;
+	return 0;
+}
+
+static int build_memreg(union t3_wr *wqe, const struct ib_reg_wr *wr,
+			u8 *flit_cnt, int *wr_cnt, struct t3_wq *wq)
+{
+	struct iwch_mr *mhp = to_iwch_mr(wr->mr);
+	int i;
+	__be64 *p;
+
+	if (mhp->npages > T3_MAX_FASTREG_DEPTH)
+		return -EINVAL;
+	*wr_cnt = 1;
+	wqe->fastreg.stag = cpu_to_be32(wr->key);
+	wqe->fastreg.len = cpu_to_be32(mhp->ibmr.length);
+	wqe->fastreg.va_base_hi = cpu_to_be32(mhp->ibmr.iova >> 32);
+	wqe->fastreg.va_base_lo_fbo =
+				cpu_to_be32(mhp->ibmr.iova & 0xffffffff);
+	wqe->fastreg.page_type_perms = cpu_to_be32(
+		V_FR_PAGE_COUNT(mhp->npages) |
+		V_FR_PAGE_SIZE(ilog2(wr->mr->page_size) - 12) |
+		V_FR_TYPE(TPT_VATO) |
+		V_FR_PERMS(iwch_ib_to_tpt_access(wr->access)));
+	p = &wqe->fastreg.pbl_addrs[0];
+	for (i = 0; i < mhp->npages; i++, p++) {
+
+		/* If we need a 2nd WR, then set it up */
+		if (i == T3_MAX_FASTREG_FRAG) {
+			*wr_cnt = 2;
+			wqe = (union t3_wr *)(wq->queue +
+				Q_PTR2IDX((wq->wptr+1), wq->size_log2));
+			build_fw_riwrh((void *)wqe, T3_WR_FASTREG, 0,
+			       Q_GENBIT(wq->wptr + 1, wq->size_log2),
+			       0, 1 + mhp->npages - T3_MAX_FASTREG_FRAG,
+			       T3_EOP);
+
+			p = &wqe->pbl_frag.pbl_addrs[0];
+		}
+		*p = cpu_to_be64((u64)mhp->pages[i]);
+	}
+	*flit_cnt = 5 + mhp->npages;
+	if (*flit_cnt > 15)
+		*flit_cnt = 15;
+	return 0;
+}
+
+static int build_inv_stag(union t3_wr *wqe, const struct ib_send_wr *wr,
+			  u8 *flit_cnt)
+{
+	wqe->local_inv.stag = cpu_to_be32(wr->ex.invalidate_rkey);
+	wqe->local_inv.reserved = 0;
+	*flit_cnt = sizeof(struct t3_local_inv_wr) >> 3;
+	return 0;
+}
+
+static int iwch_sgl2pbl_map(struct iwch_dev *rhp, struct ib_sge *sg_list,
+			    u32 num_sgle, u32 * pbl_addr, u8 * page_size)
+{
+	int i;
+	struct iwch_mr *mhp;
+	u64 offset;
+	for (i = 0; i < num_sgle; i++) {
+
+		mhp = get_mhp(rhp, (sg_list[i].lkey) >> 8);
+		if (!mhp) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EIO;
+		}
+		if (!mhp->attr.state) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EIO;
+		}
+		if (mhp->attr.zbva) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EIO;
+		}
+
+		if (sg_list[i].addr < mhp->attr.va_fbo) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EINVAL;
+		}
+		if (sg_list[i].addr + ((u64) sg_list[i].length) <
+		    sg_list[i].addr) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EINVAL;
+		}
+		if (sg_list[i].addr + ((u64) sg_list[i].length) >
+		    mhp->attr.va_fbo + ((u64) mhp->attr.len)) {
+			pr_debug("%s %d\n", __func__, __LINE__);
+			return -EINVAL;
+		}
+		offset = sg_list[i].addr - mhp->attr.va_fbo;
+		offset += mhp->attr.va_fbo &
+			  ((1UL << (12 + mhp->attr.page_size)) - 1);
+		pbl_addr[i] = ((mhp->attr.pbl_addr -
+			        rhp->rdev.rnic_info.pbl_base) >> 3) +
+			      (offset >> (12 + mhp->attr.page_size));
+		page_size[i] = mhp->attr.page_size;
+	}
+	return 0;
+}
+
+static int build_rdma_recv(struct iwch_qp *qhp, union t3_wr *wqe,
+			   const struct ib_recv_wr *wr)
+{
+	int i, err = 0;
+	u32 pbl_addr[T3_MAX_SGE];
+	u8 page_size[T3_MAX_SGE];
+
+	err = iwch_sgl2pbl_map(qhp->rhp, wr->sg_list, wr->num_sge, pbl_addr,
+			       page_size);
+	if (err)
+		return err;
+	wqe->recv.pagesz[0] = page_size[0];
+	wqe->recv.pagesz[1] = page_size[1];
+	wqe->recv.pagesz[2] = page_size[2];
+	wqe->recv.pagesz[3] = page_size[3];
+	wqe->recv.num_sgle = cpu_to_be32(wr->num_sge);
+	for (i = 0; i < wr->num_sge; i++) {
+		wqe->recv.sgl[i].stag = cpu_to_be32(wr->sg_list[i].lkey);
+		wqe->recv.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
+
+		/* to in the WQE == the offset into the page */
+		wqe->recv.sgl[i].to = cpu_to_be64(((u32)wr->sg_list[i].addr) &
+				((1UL << (12 + page_size[i])) - 1));
+
+		/* pbl_addr is the adapters address in the PBL */
+		wqe->recv.pbl_addr[i] = cpu_to_be32(pbl_addr[i]);
+	}
+	for (; i < T3_MAX_SGE; i++) {
+		wqe->recv.sgl[i].stag = 0;
+		wqe->recv.sgl[i].len = 0;
+		wqe->recv.sgl[i].to = 0;
+		wqe->recv.pbl_addr[i] = 0;
+	}
+	qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
+			     qhp->wq.rq_size_log2)].wr_id = wr->wr_id;
+	qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
+			     qhp->wq.rq_size_log2)].pbl_addr = 0;
+	return 0;
+}
+
+static int build_zero_stag_recv(struct iwch_qp *qhp, union t3_wr *wqe,
+				const struct ib_recv_wr *wr)
+{
+	int i;
+	u32 pbl_addr;
+	u32 pbl_offset;
+
+
+	/*
+	 * The T3 HW requires the PBL in the HW recv descriptor to reference
+	 * a PBL entry.  So we allocate the max needed PBL memory here and pass
+	 * it to the uP in the recv WR.  The uP will build the PBL and setup
+	 * the HW recv descriptor.
+	 */
+	pbl_addr = cxio_hal_pblpool_alloc(&qhp->rhp->rdev, T3_STAG0_PBL_SIZE);
+	if (!pbl_addr)
+		return -ENOMEM;
+
+	/*
+	 * Compute the 8B aligned offset.
+	 */
+	pbl_offset = (pbl_addr - qhp->rhp->rdev.rnic_info.pbl_base) >> 3;
+
+	wqe->recv.num_sgle = cpu_to_be32(wr->num_sge);
+
+	for (i = 0; i < wr->num_sge; i++) {
+
+		/*
+		 * Use a 128MB page size. This and an imposed 128MB
+		 * sge length limit allows us to require only a 2-entry HW
+		 * PBL for each SGE.  This restriction is acceptable since
+		 * since it is not possible to allocate 128MB of contiguous
+		 * DMA coherent memory!
+		 */
+		if (wr->sg_list[i].length > T3_STAG0_MAX_PBE_LEN)
+			return -EINVAL;
+		wqe->recv.pagesz[i] = T3_STAG0_PAGE_SHIFT;
+
+		/*
+		 * T3 restricts a recv to all zero-stag or all non-zero-stag.
+		 */
+		if (wr->sg_list[i].lkey != 0)
+			return -EINVAL;
+		wqe->recv.sgl[i].stag = 0;
+		wqe->recv.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
+		wqe->recv.sgl[i].to = cpu_to_be64(wr->sg_list[i].addr);
+		wqe->recv.pbl_addr[i] = cpu_to_be32(pbl_offset);
+		pbl_offset += 2;
+	}
+	for (; i < T3_MAX_SGE; i++) {
+		wqe->recv.pagesz[i] = 0;
+		wqe->recv.sgl[i].stag = 0;
+		wqe->recv.sgl[i].len = 0;
+		wqe->recv.sgl[i].to = 0;
+		wqe->recv.pbl_addr[i] = 0;
+	}
+	qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
+			     qhp->wq.rq_size_log2)].wr_id = wr->wr_id;
+	qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
+			     qhp->wq.rq_size_log2)].pbl_addr = pbl_addr;
+	return 0;
+}
+
+int iwch_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
+		   const struct ib_send_wr **bad_wr)
+{
+	int err = 0;
+	u8 uninitialized_var(t3_wr_flit_cnt);
+	enum t3_wr_opcode t3_wr_opcode = 0;
+	enum t3_wr_flags t3_wr_flags;
+	struct iwch_qp *qhp;
+	u32 idx;
+	union t3_wr *wqe;
+	u32 num_wrs;
+	unsigned long flag;
+	struct t3_swsq *sqp;
+	int wr_cnt = 1;
+
+	qhp = to_iwch_qp(ibqp);
+	spin_lock_irqsave(&qhp->lock, flag);
+	if (qhp->attr.state > IWCH_QP_STATE_RTS) {
+		spin_unlock_irqrestore(&qhp->lock, flag);
+		err = -EINVAL;
+		goto out;
+	}
+	num_wrs = Q_FREECNT(qhp->wq.sq_rptr, qhp->wq.sq_wptr,
+		  qhp->wq.sq_size_log2);
+	if (num_wrs == 0) {
+		spin_unlock_irqrestore(&qhp->lock, flag);
+		err = -ENOMEM;
+		goto out;
+	}
+	while (wr) {
+		if (num_wrs == 0) {
+			err = -ENOMEM;
+			break;
+		}
+		idx = Q_PTR2IDX(qhp->wq.wptr, qhp->wq.size_log2);
+		wqe = (union t3_wr *) (qhp->wq.queue + idx);
+		t3_wr_flags = 0;
+		if (wr->send_flags & IB_SEND_SOLICITED)
+			t3_wr_flags |= T3_SOLICITED_EVENT_FLAG;
+		if (wr->send_flags & IB_SEND_SIGNALED)
+			t3_wr_flags |= T3_COMPLETION_FLAG;
+		sqp = qhp->wq.sq +
+		      Q_PTR2IDX(qhp->wq.sq_wptr, qhp->wq.sq_size_log2);
+		switch (wr->opcode) {
+		case IB_WR_SEND:
+		case IB_WR_SEND_WITH_INV:
+			if (wr->send_flags & IB_SEND_FENCE)
+				t3_wr_flags |= T3_READ_FENCE_FLAG;
+			t3_wr_opcode = T3_WR_SEND;
+			err = build_rdma_send(wqe, wr, &t3_wr_flit_cnt);
+			break;
+		case IB_WR_RDMA_WRITE:
+		case IB_WR_RDMA_WRITE_WITH_IMM:
+			t3_wr_opcode = T3_WR_WRITE;
+			err = build_rdma_write(wqe, wr, &t3_wr_flit_cnt);
+			break;
+		case IB_WR_RDMA_READ:
+		case IB_WR_RDMA_READ_WITH_INV:
+			t3_wr_opcode = T3_WR_READ;
+			t3_wr_flags = 0; /* T3 reads are always signaled */
+			err = build_rdma_read(wqe, wr, &t3_wr_flit_cnt);
+			if (err)
+				break;
+			sqp->read_len = wqe->read.local_len;
+			if (!qhp->wq.oldest_read)
+				qhp->wq.oldest_read = sqp;
+			break;
+		case IB_WR_REG_MR:
+			t3_wr_opcode = T3_WR_FASTREG;
+			err = build_memreg(wqe, reg_wr(wr), &t3_wr_flit_cnt,
+					   &wr_cnt, &qhp->wq);
+			break;
+		case IB_WR_LOCAL_INV:
+			if (wr->send_flags & IB_SEND_FENCE)
+				t3_wr_flags |= T3_LOCAL_FENCE_FLAG;
+			t3_wr_opcode = T3_WR_INV_STAG;
+			err = build_inv_stag(wqe, wr, &t3_wr_flit_cnt);
+			break;
+		default:
+			pr_debug("%s post of type=%d TBD!\n", __func__,
+				 wr->opcode);
+			err = -EINVAL;
+		}
+		if (err)
+			break;
+		wqe->send.wrid.id0.hi = qhp->wq.sq_wptr;
+		sqp->wr_id = wr->wr_id;
+		sqp->opcode = wr2opcode(t3_wr_opcode);
+		sqp->sq_wptr = qhp->wq.sq_wptr;
+		sqp->complete = 0;
+		sqp->signaled = (wr->send_flags & IB_SEND_SIGNALED);
+
+		build_fw_riwrh((void *) wqe, t3_wr_opcode, t3_wr_flags,
+			       Q_GENBIT(qhp->wq.wptr, qhp->wq.size_log2),
+			       0, t3_wr_flit_cnt,
+			       (wr_cnt == 1) ? T3_SOPEOP : T3_SOP);
+		pr_debug("%s cookie 0x%llx wq idx 0x%x swsq idx %ld opcode %d\n",
+			 __func__, (unsigned long long)wr->wr_id, idx,
+			 Q_PTR2IDX(qhp->wq.sq_wptr, qhp->wq.sq_size_log2),
+			 sqp->opcode);
+		wr = wr->next;
+		num_wrs--;
+		qhp->wq.wptr += wr_cnt;
+		++(qhp->wq.sq_wptr);
+	}
+	spin_unlock_irqrestore(&qhp->lock, flag);
+	if (cxio_wq_db_enabled(&qhp->wq))
+		ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
+
+out:
+	if (err)
+		*bad_wr = wr;
+	return err;
+}
+
+int iwch_post_receive(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
+		      const struct ib_recv_wr **bad_wr)
+{
+	int err = 0;
+	struct iwch_qp *qhp;
+	u32 idx;
+	union t3_wr *wqe;
+	u32 num_wrs;
+	unsigned long flag;
+
+	qhp = to_iwch_qp(ibqp);
+	spin_lock_irqsave(&qhp->lock, flag);
+	if (qhp->attr.state > IWCH_QP_STATE_RTS) {
+		spin_unlock_irqrestore(&qhp->lock, flag);
+		err = -EINVAL;
+		goto out;
+	}
+	num_wrs = Q_FREECNT(qhp->wq.rq_rptr, qhp->wq.rq_wptr,
+			    qhp->wq.rq_size_log2) - 1;
+	if (!wr) {
+		spin_unlock_irqrestore(&qhp->lock, flag);
+		err = -ENOMEM;
+		goto out;
+	}
+	while (wr) {
+		if (wr->num_sge > T3_MAX_SGE) {
+			err = -EINVAL;
+			break;
+		}
+		idx = Q_PTR2IDX(qhp->wq.wptr, qhp->wq.size_log2);
+		wqe = (union t3_wr *) (qhp->wq.queue + idx);
+		if (num_wrs)
+			if (wr->sg_list[0].lkey)
+				err = build_rdma_recv(qhp, wqe, wr);
+			else
+				err = build_zero_stag_recv(qhp, wqe, wr);
+		else
+			err = -ENOMEM;
+
+		if (err)
+			break;
+
+		build_fw_riwrh((void *) wqe, T3_WR_RCV, T3_COMPLETION_FLAG,
+			       Q_GENBIT(qhp->wq.wptr, qhp->wq.size_log2),
+			       0, sizeof(struct t3_receive_wr) >> 3, T3_SOPEOP);
+		pr_debug("%s cookie 0x%llx idx 0x%x rq_wptr 0x%x rw_rptr 0x%x wqe %p\n",
+			 __func__, (unsigned long long)wr->wr_id,
+			 idx, qhp->wq.rq_wptr, qhp->wq.rq_rptr, wqe);
+		++(qhp->wq.rq_wptr);
+		++(qhp->wq.wptr);
+		wr = wr->next;
+		num_wrs--;
+	}
+	spin_unlock_irqrestore(&qhp->lock, flag);
+	if (cxio_wq_db_enabled(&qhp->wq))
+		ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
+
+out:
+	if (err)
+		*bad_wr = wr;
+	return err;
+}
+
+static inline void build_term_codes(struct respQ_msg_t *rsp_msg,
+				    u8 *layer_type, u8 *ecode)
+{
+	int status = TPT_ERR_INTERNAL_ERR;
+	int tagged = 0;
+	int opcode = -1;
+	int rqtype = 0;
+	int send_inv = 0;
+
+	if (rsp_msg) {
+		status = CQE_STATUS(rsp_msg->cqe);
+		opcode = CQE_OPCODE(rsp_msg->cqe);
+		rqtype = RQ_TYPE(rsp_msg->cqe);
+		send_inv = (opcode == T3_SEND_WITH_INV) ||
+		           (opcode == T3_SEND_WITH_SE_INV);
+		tagged = (opcode == T3_RDMA_WRITE) ||
+			 (rqtype && (opcode == T3_READ_RESP));
+	}
+
+	switch (status) {
+	case TPT_ERR_STAG:
+		if (send_inv) {
+			*layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
+			*ecode = RDMAP_CANT_INV_STAG;
+		} else {
+			*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+			*ecode = RDMAP_INV_STAG;
+		}
+		break;
+	case TPT_ERR_PDID:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+		if ((opcode == T3_SEND_WITH_INV) ||
+		    (opcode == T3_SEND_WITH_SE_INV))
+			*ecode = RDMAP_CANT_INV_STAG;
+		else
+			*ecode = RDMAP_STAG_NOT_ASSOC;
+		break;
+	case TPT_ERR_QPID:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+		*ecode = RDMAP_STAG_NOT_ASSOC;
+		break;
+	case TPT_ERR_ACCESS:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+		*ecode = RDMAP_ACC_VIOL;
+		break;
+	case TPT_ERR_WRAP:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+		*ecode = RDMAP_TO_WRAP;
+		break;
+	case TPT_ERR_BOUND:
+		if (tagged) {
+			*layer_type = LAYER_DDP|DDP_TAGGED_ERR;
+			*ecode = DDPT_BASE_BOUNDS;
+		} else {
+			*layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
+			*ecode = RDMAP_BASE_BOUNDS;
+		}
+		break;
+	case TPT_ERR_INVALIDATE_SHARED_MR:
+	case TPT_ERR_INVALIDATE_MR_WITH_MW_BOUND:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
+		*ecode = RDMAP_CANT_INV_STAG;
+		break;
+	case TPT_ERR_ECC:
+	case TPT_ERR_ECC_PSTAG:
+	case TPT_ERR_INTERNAL_ERR:
+		*layer_type = LAYER_RDMAP|RDMAP_LOCAL_CATA;
+		*ecode = 0;
+		break;
+	case TPT_ERR_OUT_OF_RQE:
+		*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+		*ecode = DDPU_INV_MSN_NOBUF;
+		break;
+	case TPT_ERR_PBL_ADDR_BOUND:
+		*layer_type = LAYER_DDP|DDP_TAGGED_ERR;
+		*ecode = DDPT_BASE_BOUNDS;
+		break;
+	case TPT_ERR_CRC:
+		*layer_type = LAYER_MPA|DDP_LLP;
+		*ecode = MPA_CRC_ERR;
+		break;
+	case TPT_ERR_MARKER:
+		*layer_type = LAYER_MPA|DDP_LLP;
+		*ecode = MPA_MARKER_ERR;
+		break;
+	case TPT_ERR_PDU_LEN_ERR:
+		*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+		*ecode = DDPU_MSG_TOOBIG;
+		break;
+	case TPT_ERR_DDP_VERSION:
+		if (tagged) {
+			*layer_type = LAYER_DDP|DDP_TAGGED_ERR;
+			*ecode = DDPT_INV_VERS;
+		} else {
+			*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+			*ecode = DDPU_INV_VERS;
+		}
+		break;
+	case TPT_ERR_RDMA_VERSION:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
+		*ecode = RDMAP_INV_VERS;
+		break;
+	case TPT_ERR_OPCODE:
+		*layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
+		*ecode = RDMAP_INV_OPCODE;
+		break;
+	case TPT_ERR_DDP_QUEUE_NUM:
+		*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+		*ecode = DDPU_INV_QN;
+		break;
+	case TPT_ERR_MSN:
+	case TPT_ERR_MSN_GAP:
+	case TPT_ERR_MSN_RANGE:
+	case TPT_ERR_IRD_OVERFLOW:
+		*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+		*ecode = DDPU_INV_MSN_RANGE;
+		break;
+	case TPT_ERR_TBIT:
+		*layer_type = LAYER_DDP|DDP_LOCAL_CATA;
+		*ecode = 0;
+		break;
+	case TPT_ERR_MO:
+		*layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
+		*ecode = DDPU_INV_MO;
+		break;
+	default:
+		*layer_type = LAYER_RDMAP|DDP_LOCAL_CATA;
+		*ecode = 0;
+		break;
+	}
+}
+
+int iwch_post_zb_read(struct iwch_ep *ep)
+{
+	union t3_wr *wqe;
+	struct sk_buff *skb;
+	u8 flit_cnt = sizeof(struct t3_rdma_read_wr) >> 3;
+
+	pr_debug("%s enter\n", __func__);
+	skb = alloc_skb(40, GFP_KERNEL);
+	if (!skb) {
+		pr_err("%s cannot send zb_read!!\n", __func__);
+		return -ENOMEM;
+	}
+	wqe = skb_put_zero(skb, sizeof(struct t3_rdma_read_wr));
+	wqe->read.rdmaop = T3_READ_REQ;
+	wqe->read.reserved[0] = 0;
+	wqe->read.reserved[1] = 0;
+	wqe->read.rem_stag = cpu_to_be32(1);
+	wqe->read.rem_to = cpu_to_be64(1);
+	wqe->read.local_stag = cpu_to_be32(1);
+	wqe->read.local_len = cpu_to_be32(0);
+	wqe->read.local_to = cpu_to_be64(1);
+	wqe->send.wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_READ));
+	wqe->send.wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(ep->hwtid)|
+						V_FW_RIWR_LEN(flit_cnt));
+	skb->priority = CPL_PRIORITY_DATA;
+	return iwch_cxgb3_ofld_send(ep->com.qp->rhp->rdev.t3cdev_p, skb);
+}
+
+/*
+ * This posts a TERMINATE with layer=RDMA, type=catastrophic.
+ */
+int iwch_post_terminate(struct iwch_qp *qhp, struct respQ_msg_t *rsp_msg)
+{
+	union t3_wr *wqe;
+	struct terminate_message *term;
+	struct sk_buff *skb;
+
+	pr_debug("%s %d\n", __func__, __LINE__);
+	skb = alloc_skb(40, GFP_ATOMIC);
+	if (!skb) {
+		pr_err("%s cannot send TERMINATE!\n", __func__);
+		return -ENOMEM;
+	}
+	wqe = skb_put_zero(skb, 40);
+	wqe->send.rdmaop = T3_TERMINATE;
+
+	/* immediate data length */
+	wqe->send.plen = htonl(4);
+
+	/* immediate data starts here. */
+	term = (struct terminate_message *)wqe->send.sgl;
+	build_term_codes(rsp_msg, &term->layer_etype, &term->ecode);
+	wqe->send.wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_SEND) |
+			 V_FW_RIWR_FLAGS(T3_COMPLETION_FLAG | T3_NOTIFY_FLAG));
+	wqe->send.wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(qhp->ep->hwtid));
+	skb->priority = CPL_PRIORITY_DATA;
+	return iwch_cxgb3_ofld_send(qhp->rhp->rdev.t3cdev_p, skb);
+}
+
+/*
+ * Assumes qhp lock is held.
+ */
+static void __flush_qp(struct iwch_qp *qhp, struct iwch_cq *rchp,
+				struct iwch_cq *schp)
+	__releases(&qhp->lock)
+	__acquires(&qhp->lock)
+{
+	int count;
+	int flushed;
+
+	lockdep_assert_held(&qhp->lock);
+
+	pr_debug("%s qhp %p rchp %p schp %p\n", __func__, qhp, rchp, schp);
+	/* take a ref on the qhp since we must release the lock */
+	atomic_inc(&qhp->refcnt);
+	spin_unlock(&qhp->lock);
+
+	/* locking hierarchy: cq lock first, then qp lock. */
+	spin_lock(&rchp->lock);
+	spin_lock(&qhp->lock);
+	cxio_flush_hw_cq(&rchp->cq);
+	cxio_count_rcqes(&rchp->cq, &qhp->wq, &count);
+	flushed = cxio_flush_rq(&qhp->wq, &rchp->cq, count);
+	spin_unlock(&qhp->lock);
+	spin_unlock(&rchp->lock);
+	if (flushed) {
+		spin_lock(&rchp->comp_handler_lock);
+		(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
+		spin_unlock(&rchp->comp_handler_lock);
+	}
+
+	/* locking hierarchy: cq lock first, then qp lock. */
+	spin_lock(&schp->lock);
+	spin_lock(&qhp->lock);
+	cxio_flush_hw_cq(&schp->cq);
+	cxio_count_scqes(&schp->cq, &qhp->wq, &count);
+	flushed = cxio_flush_sq(&qhp->wq, &schp->cq, count);
+	spin_unlock(&qhp->lock);
+	spin_unlock(&schp->lock);
+	if (flushed) {
+		spin_lock(&schp->comp_handler_lock);
+		(*schp->ibcq.comp_handler)(&schp->ibcq, schp->ibcq.cq_context);
+		spin_unlock(&schp->comp_handler_lock);
+	}
+
+	/* deref */
+	if (atomic_dec_and_test(&qhp->refcnt))
+	        wake_up(&qhp->wait);
+
+	spin_lock(&qhp->lock);
+}
+
+static void flush_qp(struct iwch_qp *qhp)
+{
+	struct iwch_cq *rchp, *schp;
+
+	rchp = get_chp(qhp->rhp, qhp->attr.rcq);
+	schp = get_chp(qhp->rhp, qhp->attr.scq);
+
+	if (qhp->ibqp.uobject) {
+		cxio_set_wq_in_error(&qhp->wq);
+		cxio_set_cq_in_error(&rchp->cq);
+		spin_lock(&rchp->comp_handler_lock);
+		(*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
+		spin_unlock(&rchp->comp_handler_lock);
+		if (schp != rchp) {
+			cxio_set_cq_in_error(&schp->cq);
+			spin_lock(&schp->comp_handler_lock);
+			(*schp->ibcq.comp_handler)(&schp->ibcq,
+						   schp->ibcq.cq_context);
+			spin_unlock(&schp->comp_handler_lock);
+		}
+		return;
+	}
+	__flush_qp(qhp, rchp, schp);
+}
+
+
+/*
+ * Return count of RECV WRs posted
+ */
+u16 iwch_rqes_posted(struct iwch_qp *qhp)
+{
+	union t3_wr *wqe = qhp->wq.queue;
+	u16 count = 0;
+
+	while (count < USHRT_MAX && fw_riwrh_opcode((struct fw_riwrh *)wqe) == T3_WR_RCV) {
+		count++;
+		wqe++;
+	}
+	pr_debug("%s qhp %p count %u\n", __func__, qhp, count);
+	return count;
+}
+
+static int rdma_init(struct iwch_dev *rhp, struct iwch_qp *qhp,
+				enum iwch_qp_attr_mask mask,
+				struct iwch_qp_attributes *attrs)
+{
+	struct t3_rdma_init_attr init_attr;
+	int ret;
+
+	init_attr.tid = qhp->ep->hwtid;
+	init_attr.qpid = qhp->wq.qpid;
+	init_attr.pdid = qhp->attr.pd;
+	init_attr.scqid = qhp->attr.scq;
+	init_attr.rcqid = qhp->attr.rcq;
+	init_attr.rq_addr = qhp->wq.rq_addr;
+	init_attr.rq_size = 1 << qhp->wq.rq_size_log2;
+	init_attr.mpaattrs = uP_RI_MPA_IETF_ENABLE |
+		qhp->attr.mpa_attr.recv_marker_enabled |
+		(qhp->attr.mpa_attr.xmit_marker_enabled << 1) |
+		(qhp->attr.mpa_attr.crc_enabled << 2);
+
+	init_attr.qpcaps = uP_RI_QP_RDMA_READ_ENABLE |
+			   uP_RI_QP_RDMA_WRITE_ENABLE |
+			   uP_RI_QP_BIND_ENABLE;
+	if (!qhp->ibqp.uobject)
+		init_attr.qpcaps |= uP_RI_QP_STAG0_ENABLE |
+				    uP_RI_QP_FAST_REGISTER_ENABLE;
+
+	init_attr.tcp_emss = qhp->ep->emss;
+	init_attr.ord = qhp->attr.max_ord;
+	init_attr.ird = qhp->attr.max_ird;
+	init_attr.qp_dma_addr = qhp->wq.dma_addr;
+	init_attr.qp_dma_size = (1UL << qhp->wq.size_log2);
+	init_attr.rqe_count = iwch_rqes_posted(qhp);
+	init_attr.flags = qhp->attr.mpa_attr.initiator ? MPA_INITIATOR : 0;
+	init_attr.chan = qhp->ep->l2t->smt_idx;
+	if (peer2peer) {
+		init_attr.rtr_type = RTR_READ;
+		if (init_attr.ord == 0 && qhp->attr.mpa_attr.initiator)
+			init_attr.ord = 1;
+		if (init_attr.ird == 0 && !qhp->attr.mpa_attr.initiator)
+			init_attr.ird = 1;
+	} else
+		init_attr.rtr_type = 0;
+	init_attr.irs = qhp->ep->rcv_seq;
+	pr_debug("%s init_attr.rq_addr 0x%x init_attr.rq_size = %d flags 0x%x qpcaps 0x%x\n",
+		 __func__,
+		 init_attr.rq_addr, init_attr.rq_size,
+		 init_attr.flags, init_attr.qpcaps);
+	ret = cxio_rdma_init(&rhp->rdev, &init_attr);
+	pr_debug("%s ret %d\n", __func__, ret);
+	return ret;
+}
+
+int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
+				enum iwch_qp_attr_mask mask,
+				struct iwch_qp_attributes *attrs,
+				int internal)
+{
+	int ret = 0;
+	struct iwch_qp_attributes newattr = qhp->attr;
+	unsigned long flag;
+	int disconnect = 0;
+	int terminate = 0;
+	int abort = 0;
+	int free = 0;
+	struct iwch_ep *ep = NULL;
+
+	pr_debug("%s qhp %p qpid 0x%x ep %p state %d -> %d\n", __func__,
+		 qhp, qhp->wq.qpid, qhp->ep, qhp->attr.state,
+		 (mask & IWCH_QP_ATTR_NEXT_STATE) ? attrs->next_state : -1);
+
+	spin_lock_irqsave(&qhp->lock, flag);
+
+	/* Process attr changes if in IDLE */
+	if (mask & IWCH_QP_ATTR_VALID_MODIFY) {
+		if (qhp->attr.state != IWCH_QP_STATE_IDLE) {
+			ret = -EIO;
+			goto out;
+		}
+		if (mask & IWCH_QP_ATTR_ENABLE_RDMA_READ)
+			newattr.enable_rdma_read = attrs->enable_rdma_read;
+		if (mask & IWCH_QP_ATTR_ENABLE_RDMA_WRITE)
+			newattr.enable_rdma_write = attrs->enable_rdma_write;
+		if (mask & IWCH_QP_ATTR_ENABLE_RDMA_BIND)
+			newattr.enable_bind = attrs->enable_bind;
+		if (mask & IWCH_QP_ATTR_MAX_ORD) {
+			if (attrs->max_ord >
+			    rhp->attr.max_rdma_read_qp_depth) {
+				ret = -EINVAL;
+				goto out;
+			}
+			newattr.max_ord = attrs->max_ord;
+		}
+		if (mask & IWCH_QP_ATTR_MAX_IRD) {
+			if (attrs->max_ird >
+			    rhp->attr.max_rdma_reads_per_qp) {
+				ret = -EINVAL;
+				goto out;
+			}
+			newattr.max_ird = attrs->max_ird;
+		}
+		qhp->attr = newattr;
+	}
+
+	if (!(mask & IWCH_QP_ATTR_NEXT_STATE))
+		goto out;
+	if (qhp->attr.state == attrs->next_state)
+		goto out;
+
+	switch (qhp->attr.state) {
+	case IWCH_QP_STATE_IDLE:
+		switch (attrs->next_state) {
+		case IWCH_QP_STATE_RTS:
+			if (!(mask & IWCH_QP_ATTR_LLP_STREAM_HANDLE)) {
+				ret = -EINVAL;
+				goto out;
+			}
+			if (!(mask & IWCH_QP_ATTR_MPA_ATTR)) {
+				ret = -EINVAL;
+				goto out;
+			}
+			qhp->attr.mpa_attr = attrs->mpa_attr;
+			qhp->attr.llp_stream_handle = attrs->llp_stream_handle;
+			qhp->ep = qhp->attr.llp_stream_handle;
+			qhp->attr.state = IWCH_QP_STATE_RTS;
+
+			/*
+			 * Ref the endpoint here and deref when we
+			 * disassociate the endpoint from the QP.  This
+			 * happens in CLOSING->IDLE transition or *->ERROR
+			 * transition.
+			 */
+			get_ep(&qhp->ep->com);
+			spin_unlock_irqrestore(&qhp->lock, flag);
+			ret = rdma_init(rhp, qhp, mask, attrs);
+			spin_lock_irqsave(&qhp->lock, flag);
+			if (ret)
+				goto err;
+			break;
+		case IWCH_QP_STATE_ERROR:
+			qhp->attr.state = IWCH_QP_STATE_ERROR;
+			flush_qp(qhp);
+			break;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+		break;
+	case IWCH_QP_STATE_RTS:
+		switch (attrs->next_state) {
+		case IWCH_QP_STATE_CLOSING:
+			BUG_ON(kref_read(&qhp->ep->com.kref) < 2);
+			qhp->attr.state = IWCH_QP_STATE_CLOSING;
+			if (!internal) {
+				abort=0;
+				disconnect = 1;
+				ep = qhp->ep;
+				get_ep(&ep->com);
+			}
+			break;
+		case IWCH_QP_STATE_TERMINATE:
+			qhp->attr.state = IWCH_QP_STATE_TERMINATE;
+			if (qhp->ibqp.uobject)
+				cxio_set_wq_in_error(&qhp->wq);
+			if (!internal)
+				terminate = 1;
+			break;
+		case IWCH_QP_STATE_ERROR:
+			qhp->attr.state = IWCH_QP_STATE_ERROR;
+			if (!internal) {
+				abort=1;
+				disconnect = 1;
+				ep = qhp->ep;
+				get_ep(&ep->com);
+			}
+			goto err;
+			break;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+		break;
+	case IWCH_QP_STATE_CLOSING:
+		if (!internal) {
+			ret = -EINVAL;
+			goto out;
+		}
+		switch (attrs->next_state) {
+			case IWCH_QP_STATE_IDLE:
+				flush_qp(qhp);
+				qhp->attr.state = IWCH_QP_STATE_IDLE;
+				qhp->attr.llp_stream_handle = NULL;
+				put_ep(&qhp->ep->com);
+				qhp->ep = NULL;
+				wake_up(&qhp->wait);
+				break;
+			case IWCH_QP_STATE_ERROR:
+				goto err;
+			default:
+				ret = -EINVAL;
+				goto err;
+		}
+		break;
+	case IWCH_QP_STATE_ERROR:
+		if (attrs->next_state != IWCH_QP_STATE_IDLE) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		if (!Q_EMPTY(qhp->wq.sq_rptr, qhp->wq.sq_wptr) ||
+		    !Q_EMPTY(qhp->wq.rq_rptr, qhp->wq.rq_wptr)) {
+			ret = -EINVAL;
+			goto out;
+		}
+		qhp->attr.state = IWCH_QP_STATE_IDLE;
+		break;
+	case IWCH_QP_STATE_TERMINATE:
+		if (!internal) {
+			ret = -EINVAL;
+			goto out;
+		}
+		goto err;
+		break;
+	default:
+		pr_err("%s in a bad state %d\n", __func__, qhp->attr.state);
+		ret = -EINVAL;
+		goto err;
+		break;
+	}
+	goto out;
+err:
+	pr_debug("%s disassociating ep %p qpid 0x%x\n", __func__, qhp->ep,
+		 qhp->wq.qpid);
+
+	/* disassociate the LLP connection */
+	qhp->attr.llp_stream_handle = NULL;
+	ep = qhp->ep;
+	qhp->ep = NULL;
+	qhp->attr.state = IWCH_QP_STATE_ERROR;
+	free=1;
+	wake_up(&qhp->wait);
+	BUG_ON(!ep);
+	flush_qp(qhp);
+out:
+	spin_unlock_irqrestore(&qhp->lock, flag);
+
+	if (terminate)
+		iwch_post_terminate(qhp, NULL);
+
+	/*
+	 * If disconnect is 1, then we need to initiate a disconnect
+	 * on the EP.  This can be a normal close (RTS->CLOSING) or
+	 * an abnormal close (RTS/CLOSING->ERROR).
+	 */
+	if (disconnect) {
+		iwch_ep_disconnect(ep, abort, GFP_KERNEL);
+		put_ep(&ep->com);
+	}
+
+	/*
+	 * If free is 1, then we've disassociated the EP from the QP
+	 * and we need to dereference the EP.
+	 */
+	if (free)
+		put_ep(&ep->com);
+
+	pr_debug("%s exit state %d\n", __func__, qhp->attr.state);
+	return ret;
+}