[PATCH v2 05/13] SoftiWarp application interface

[Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>]

Signed-off-by: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
---
 drivers/infiniband/sw/siw/siw_ae.c    |  113 ++
 drivers/infiniband/sw/siw/siw_verbs.c | 1929 +++++++++++++++++++++++++++++++++
 drivers/infiniband/sw/siw/siw_verbs.h |  119 ++
 include/uapi/rdma/siw_user.h          |  220 ++++
 4 files changed, 2381 insertions(+)
 create mode 100644 drivers/infiniband/sw/siw/siw_ae.c
 create mode 100644 drivers/infiniband/sw/siw/siw_verbs.c
 create mode 100644 drivers/infiniband/sw/siw/siw_verbs.h
 create mode 100644 include/uapi/rdma/siw_user.h

diff --git a/drivers/infiniband/sw/siw/siw_ae.c b/drivers/infiniband/sw/siw/siw_ae.c
new file mode 100644
index 000000000000..c1c6544adc7c
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_ae.c
@@ -0,0 +1,113 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
+ *
+ * Copyright (c) 2008-2017, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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/errno.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/scatterlist.h>
+#include <linux/highmem.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <net/tcp.h>
+
+#include <rdma/iw_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_user_verbs.h>
+
+#include "siw.h"
+#include "siw_obj.h"
+#include "siw_cm.h"
+
+
+void siw_qp_event(struct siw_qp *qp, enum ib_event_type etype)
+{
+	struct ib_event event;
+	struct ib_qp	*ofa_qp = &qp->ofa_qp;
+
+	event.event = etype;
+	event.device = ofa_qp->device;
+	event.element.qp = ofa_qp;
+
+	if (!(qp->attrs.flags & SIW_QP_IN_DESTROY) && ofa_qp->event_handler) {
+		dprint(DBG_EH, ": reporting %d\n", etype);
+		(*ofa_qp->event_handler)(&event, ofa_qp->qp_context);
+	}
+}
+
+void siw_cq_event(struct siw_cq *cq, enum ib_event_type etype)
+{
+	struct ib_event event;
+	struct ib_cq	*ofa_cq = &cq->ofa_cq;
+
+	event.event = etype;
+	event.device = ofa_cq->device;
+	event.element.cq = ofa_cq;
+
+	if (ofa_cq->event_handler) {
+		dprint(DBG_EH, ": reporting %d\n", etype);
+		(*ofa_cq->event_handler)(&event, ofa_cq->cq_context);
+	}
+}
+
+void siw_srq_event(struct siw_srq *srq, enum ib_event_type etype)
+{
+	struct ib_event event;
+	struct ib_srq	*ofa_srq = &srq->ofa_srq;
+
+	event.event = etype;
+	event.device = ofa_srq->device;
+	event.element.srq = ofa_srq;
+
+	if (ofa_srq->event_handler) {
+		dprint(DBG_EH, ": reporting %d\n", etype);
+		(*ofa_srq->event_handler)(&event, ofa_srq->srq_context);
+	}
+}
+
+void siw_port_event(struct siw_dev *sdev, u8 port, enum ib_event_type etype)
+{
+	struct ib_event event;
+
+	event.event = etype;
+	event.device = &sdev->ofa_dev;
+	event.element.port_num = port;
+
+	dprint(DBG_EH, ": reporting %d\n", etype);
+	ib_dispatch_event(&event);
+}
diff --git a/drivers/infiniband/sw/siw/siw_verbs.c b/drivers/infiniband/sw/siw/siw_verbs.c
new file mode 100644
index 000000000000..2e72e954ff42
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_verbs.c
@@ -0,0 +1,1929 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
+ *
+ * Copyright (c) 2008-2017, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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/errno.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+
+#include <rdma/iw_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_user_verbs.h>
+
+#include "siw.h"
+#include "siw_verbs.h"
+#include "siw_obj.h"
+#include "siw_cm.h"
+
+static int ib_qp_state_to_siw_qp_state[IB_QPS_ERR+1] = {
+	[IB_QPS_RESET]	= SIW_QP_STATE_IDLE,
+	[IB_QPS_INIT]	= SIW_QP_STATE_IDLE,
+	[IB_QPS_RTR]	= SIW_QP_STATE_RTR,
+	[IB_QPS_RTS]	= SIW_QP_STATE_RTS,
+	[IB_QPS_SQD]	= SIW_QP_STATE_CLOSING,
+	[IB_QPS_SQE]	= SIW_QP_STATE_TERMINATE,
+	[IB_QPS_ERR]	= SIW_QP_STATE_ERROR
+};
+
+static inline struct siw_pd *siw_pd_ofa2siw(struct ib_pd *ofa_pd)
+{
+	return container_of(ofa_pd, struct siw_pd, ofa_pd);
+}
+
+static inline struct siw_ucontext *siw_ctx_ofa2siw(struct ib_ucontext *ofa_ctx)
+{
+	return container_of(ofa_ctx, struct siw_ucontext, ib_ucontext);
+}
+
+static inline struct siw_cq *siw_cq_ofa2siw(struct ib_cq *ofa_cq)
+{
+	return container_of(ofa_cq, struct siw_cq, ofa_cq);
+}
+
+static inline struct siw_srq *siw_srq_ofa2siw(struct ib_srq *ofa_srq)
+{
+	return container_of(ofa_srq, struct siw_srq, ofa_srq);
+}
+
+static u32 siw_insert_uobj(struct siw_ucontext *uctx, void *vaddr, u32 size)
+{
+	struct siw_uobj *uobj;
+	u32	key = SIW_INVAL_UOBJ_KEY;
+
+	uobj = kzalloc(sizeof(*uobj), GFP_KERNEL);
+	if (!uobj)
+		goto out;
+
+	size = PAGE_ALIGN(size);
+
+	spin_lock(&uctx->uobj_lock);
+
+	if (list_empty(&uctx->uobj_list))
+		uctx->uobj_key = 0;
+
+	key = uctx->uobj_key;
+
+	uobj->key = uctx->uobj_key;
+	uctx->uobj_key += size; /* advance for next object */
+
+	if (key > SIW_MAX_UOBJ_KEY) {
+		uctx->uobj_key -= size;
+		key = SIW_INVAL_UOBJ_KEY;
+		kfree(uobj);
+		goto out;
+	}
+	uobj->size = size;
+	uobj->addr = vaddr;
+
+	list_add_tail(&uobj->list, &uctx->uobj_list);
+out:
+	spin_unlock(&uctx->uobj_lock);
+
+	return key;
+}
+
+static struct siw_uobj *siw_remove_uobj(struct siw_ucontext *uctx, u32 key,
+					u32 size)
+{
+	struct list_head *pos, *nxt;
+
+	spin_lock(&uctx->uobj_lock);
+
+	list_for_each_safe(pos, nxt, &uctx->uobj_list) {
+		struct siw_uobj *uobj = list_entry(pos, struct siw_uobj, list);
+
+		if (uobj->key == key && uobj->size == size) {
+			list_del(&uobj->list);
+			spin_unlock(&uctx->uobj_lock);
+			return uobj;
+		}
+	}
+	spin_unlock(&uctx->uobj_lock);
+
+	return NULL;
+}
+
+int siw_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma)
+{
+	struct siw_ucontext     *uctx = siw_ctx_ofa2siw(ctx);
+	struct siw_uobj         *uobj;
+	u32     key = vma->vm_pgoff << PAGE_SHIFT;
+	int     size = vma->vm_end - vma->vm_start;
+	int     rv = -EINVAL;
+
+	/*
+	 * Must be page aligned
+	 */
+	if (vma->vm_start & (PAGE_SIZE - 1)) {
+		pr_warn("map not page aligned\n");
+		goto out;
+	}
+
+	uobj = siw_remove_uobj(uctx, key, size);
+	if (!uobj) {
+		pr_warn("mmap lookup failed: %u, %d\n", key, size);
+		goto out;
+	}
+	rv = remap_vmalloc_range(vma, uobj->addr, 0);
+	if (rv)
+		pr_warn("remap_vmalloc_range failed: %u, %d\n", key, size);
+
+	kfree(uobj);
+out:
+	return rv;
+}
+
+
+struct ib_ucontext *siw_alloc_ucontext(struct ib_device *ofa_dev,
+				       struct ib_udata *udata)
+{
+	struct siw_ucontext *ctx = NULL;
+	struct siw_dev *sdev = siw_dev_ofa2siw(ofa_dev);
+	int rv;
+
+	dprint(DBG_CM, "(device=%s)\n", ofa_dev->name);
+
+	if (atomic_inc_return(&sdev->num_ctx) > SIW_MAX_CONTEXT) {
+		dprint(DBG_ON, ": Out of CONTEXT's\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	spin_lock_init(&ctx->uobj_lock);
+	INIT_LIST_HEAD(&ctx->uobj_list);
+	ctx->uobj_key = 0;
+
+	ctx->sdev = sdev;
+	if (udata) {
+		struct siw_uresp_alloc_ctx uresp;
+
+		memset(&uresp, 0, sizeof(uresp));
+		uresp.dev_id = sdev->attrs.vendor_part_id;
+
+		rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+		if (rv)
+			goto err_out;
+	}
+	return &ctx->ib_ucontext;
+
+err_out:
+	kfree(ctx);
+
+	atomic_dec(&sdev->num_ctx);
+	return ERR_PTR(rv);
+}
+
+int siw_dealloc_ucontext(struct ib_ucontext *ofa_ctx)
+{
+	struct siw_ucontext *ctx = siw_ctx_ofa2siw(ofa_ctx);
+
+	atomic_dec(&ctx->sdev->num_ctx);
+	kfree(ctx);
+	return 0;
+}
+
+int siw_query_device(struct ib_device *ofa_dev, struct ib_device_attr *attr,
+		     struct ib_udata *unused)
+{
+	struct siw_dev *sdev = siw_dev_ofa2siw(ofa_dev);
+	/*
+	 * A process context is needed to report avail memory resources.
+	 */
+	if (in_interrupt())
+		return -EINVAL;
+
+	memset(attr, 0, sizeof(*attr));
+
+	attr->max_mr_size = rlimit(RLIMIT_MEMLOCK); /* per process */
+	attr->vendor_id = sdev->attrs.vendor_id;
+	attr->vendor_part_id = sdev->attrs.vendor_part_id;
+	attr->max_qp = sdev->attrs.max_qp;
+	attr->max_qp_wr = sdev->attrs.max_qp_wr;
+
+	attr->max_qp_rd_atom = sdev->attrs.max_ord;
+	attr->max_qp_init_rd_atom = sdev->attrs.max_ird;
+	attr->max_res_rd_atom = sdev->attrs.max_qp * sdev->attrs.max_ird;
+	attr->device_cap_flags = sdev->attrs.cap_flags;
+	attr->max_sge = sdev->attrs.max_sge;
+	attr->max_sge_rd = sdev->attrs.max_sge_rd;
+	attr->max_cq = sdev->attrs.max_cq;
+	attr->max_cqe = sdev->attrs.max_cqe;
+	attr->max_mr = sdev->attrs.max_mr;
+	attr->max_pd = sdev->attrs.max_pd;
+	attr->max_mw = sdev->attrs.max_mw;
+	attr->max_fmr = sdev->attrs.max_fmr;
+	attr->max_srq = sdev->attrs.max_srq;
+	attr->max_srq_wr = sdev->attrs.max_srq_wr;
+	attr->max_srq_sge = sdev->attrs.max_srq_sge;
+	attr->max_fast_reg_page_list_len = SIW_MAX_SGE_PBL;
+
+	memcpy(&attr->sys_image_guid, sdev->netdev->dev_addr, 6);
+
+	/*
+	 * TODO: understand what of the following should
+	 * get useful information
+	 *
+	 * attr->fw_ver;
+	 * attr->max_ah
+	 * attr->max_map_per_fmr
+	 * attr->max_ee
+	 * attr->max_rdd
+	 * attr->max_ee_rd_atom;
+	 * attr->max_ee_init_rd_atom;
+	 * attr->max_raw_ipv6_qp
+	 * attr->max_raw_ethy_qp
+	 * attr->max_mcast_grp
+	 * attr->max_mcast_qp_attach
+	 * attr->max_total_mcast_qp_attach
+	 * attr->max_pkeys
+	 * attr->atomic_cap;
+	 * attr->page_size_cap;
+	 * attr->hw_ver;
+	 * attr->local_ca_ack_delay;
+	 */
+	return 0;
+}
+
+/*
+ * Approximate translation of real MTU for IB.
+ *
+ * TODO: is that needed for RNIC's? We may have a medium
+ *       which reports MTU of 64kb and have to degrade to 4k??
+ */
+static inline enum ib_mtu siw_mtu_net2ofa(unsigned short mtu)
+{
+	if (mtu >= 4096)
+		return IB_MTU_4096;
+	if (mtu >= 2048)
+		return IB_MTU_2048;
+	if (mtu >= 1024)
+		return IB_MTU_1024;
+	if (mtu >= 512)
+		return IB_MTU_512;
+	if (mtu >= 256)
+		return IB_MTU_256;
+	return IB_MTU_4096;
+}
+
+int siw_query_port(struct ib_device *ofa_dev, u8 port,
+		     struct ib_port_attr *attr)
+{
+	struct siw_dev *sdev = siw_dev_ofa2siw(ofa_dev);
+
+	memset(attr, 0, sizeof(*attr));
+
+	attr->state = sdev->state;
+	attr->max_mtu = siw_mtu_net2ofa(sdev->netdev->mtu);
+	attr->active_mtu = attr->max_mtu;
+	attr->gid_tbl_len = 1;
+	attr->port_cap_flags = IB_PORT_CM_SUP;	/* ?? */
+	attr->port_cap_flags |= IB_PORT_DEVICE_MGMT_SUP;
+	attr->max_msg_sz = -1;
+	attr->pkey_tbl_len = 1;
+	attr->active_width = 2;
+	attr->active_speed = 2;
+	attr->phys_state = sdev->state == IB_PORT_ACTIVE ? 5 : 3;
+	/*
+	 * All zero
+	 *
+	 * attr->lid = 0;
+	 * attr->bad_pkey_cntr = 0;
+	 * attr->qkey_viol_cntr = 0;
+	 * attr->sm_lid = 0;
+	 * attr->lmc = 0;
+	 * attr->max_vl_num = 0;
+	 * attr->sm_sl = 0;
+	 * attr->subnet_timeout = 0;
+	 * attr->init_type_repy = 0;
+	 */
+	return 0;
+}
+
+int siw_get_port_immutable(struct ib_device *ofa_dev, u8 port,
+			   struct ib_port_immutable *port_immutable)
+{
+	struct ib_port_attr attr;
+	int rv = siw_query_port(ofa_dev, port, &attr);
+
+	if (rv)
+		return rv;
+
+	port_immutable->pkey_tbl_len = attr.pkey_tbl_len;
+	port_immutable->gid_tbl_len = attr.gid_tbl_len;
+	port_immutable->core_cap_flags = RDMA_CORE_PORT_IWARP;
+
+	return 0;
+}
+
+int siw_query_pkey(struct ib_device *ofa_dev, u8 port, u16 idx, u16 *pkey)
+{
+	/* Report the default pkey */
+	*pkey = 0xffff;
+	return 0;
+}
+
+int siw_query_gid(struct ib_device *ofa_dev, u8 port, int idx,
+		   union ib_gid *gid)
+{
+	struct siw_dev *sdev = siw_dev_ofa2siw(ofa_dev);
+
+	/* subnet_prefix == interface_id == 0; */
+	memset(gid, 0, sizeof(*gid));
+	memcpy(&gid->raw[0], sdev->netdev->dev_addr, 6);
+
+	return 0;
+}
+
+struct ib_pd *siw_alloc_pd(struct ib_device *ofa_dev,
+			   struct ib_ucontext *context, struct ib_udata *udata)
+{
+	struct siw_pd	*pd = NULL;
+	struct siw_dev	*sdev  = siw_dev_ofa2siw(ofa_dev);
+	int rv;
+
+	if (atomic_inc_return(&sdev->num_pd) > SIW_MAX_PD) {
+		dprint(DBG_ON, ": Out of PD's\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	pd = kmalloc(sizeof(*pd), GFP_KERNEL);
+	if (!pd) {
+		dprint(DBG_ON, ": malloc\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	rv = siw_pd_add(sdev, pd);
+	if (rv) {
+		dprint(DBG_ON, ": siw_pd_add\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (context) {
+		if (ib_copy_to_udata(udata, &pd->hdr.id, sizeof(pd->hdr.id))) {
+			rv = -EFAULT;
+			goto err_out_idr;
+		}
+	}
+	return &pd->ofa_pd;
+
+err_out_idr:
+	siw_remove_obj(&sdev->idr_lock, &sdev->pd_idr, &pd->hdr);
+err_out:
+	kfree(pd);
+	atomic_dec(&sdev->num_pd);
+
+	return ERR_PTR(rv);
+}
+
+int siw_dealloc_pd(struct ib_pd *ofa_pd)
+{
+	struct siw_pd	*pd = siw_pd_ofa2siw(ofa_pd);
+	struct siw_dev	*sdev = siw_dev_ofa2siw(ofa_pd->device);
+
+	siw_remove_obj(&sdev->idr_lock, &sdev->pd_idr, &pd->hdr);
+	siw_pd_put(pd);
+
+	return 0;
+}
+
+void siw_qp_get_ref(struct ib_qp *ofa_qp)
+{
+	struct siw_qp	*qp = siw_qp_ofa2siw(ofa_qp);
+
+	dprint(DBG_OBJ|DBG_CM, "(QP%d): Get Reference\n", QP_ID(qp));
+	siw_qp_get(qp);
+}
+
+
+void siw_qp_put_ref(struct ib_qp *ofa_qp)
+{
+	struct siw_qp	*qp = siw_qp_ofa2siw(ofa_qp);
+
+	dprint(DBG_OBJ|DBG_CM, "(QP%d): Put Reference\n", QP_ID(qp));
+	siw_qp_put(qp);
+}
+
+int siw_no_mad(struct ib_device *ofa_dev, int flags, u8 port,
+	       const struct ib_wc *wc, const struct ib_grh *grh,
+	       const struct ib_mad_hdr *in_mad, size_t in_mad_size,
+	       struct ib_mad_hdr *out_mad, size_t *out_mad_size,
+	       u16 *outmad_pkey_index)
+{
+	return -EOPNOTSUPP;
+}
+
+
+/*
+ * siw_create_qp()
+ *
+ * Create QP of requested size on given device.
+ *
+ * @ofa_pd:	OFA PD contained in siw PD
+ * @attrs:	Initial QP attributes.
+ * @udata:	used to provide QP ID, SQ and RQ size back to user.
+ */
+
+struct ib_qp *siw_create_qp(struct ib_pd *ofa_pd,
+			    struct ib_qp_init_attr *attrs,
+			    struct ib_udata *udata)
+{
+	struct siw_qp			*qp = NULL;
+	struct siw_pd			*pd = siw_pd_ofa2siw(ofa_pd);
+	struct ib_device		*ofa_dev = ofa_pd->device;
+	struct siw_dev			*sdev = siw_dev_ofa2siw(ofa_dev);
+	struct siw_cq			*scq = NULL, *rcq = NULL;
+
+	unsigned long flags;
+	int num_sqe, num_rqe, rv = 0;
+
+	dprint(DBG_OBJ|DBG_CM, ": new QP on device %s\n",
+		ofa_dev->name);
+
+	if (atomic_inc_return(&sdev->num_qp) > SIW_MAX_QP) {
+		dprint(DBG_ON, ": Out of QP's\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (attrs->qp_type != IB_QPT_RC) {
+		dprint(DBG_ON, ": Only RC QP's supported\n");
+		rv = -EINVAL;
+		goto err_out;
+	}
+	if ((attrs->cap.max_send_wr > SIW_MAX_QP_WR) ||
+	    (attrs->cap.max_recv_wr > SIW_MAX_QP_WR) ||
+	    (attrs->cap.max_send_sge > SIW_MAX_SGE)  ||
+	    (attrs->cap.max_recv_sge > SIW_MAX_SGE)) {
+		dprint(DBG_ON, ": QP Size!\n");
+		rv = -EINVAL;
+		goto err_out;
+	}
+	if (attrs->cap.max_inline_data > SIW_MAX_INLINE) {
+		dprint(DBG_ON, ": Max Inline Send %d > %d!\n",
+		       attrs->cap.max_inline_data, (int)SIW_MAX_INLINE);
+		rv = -EINVAL;
+		goto err_out;
+	}
+	/*
+	 * NOTE: we allow for zero element SQ and RQ WQE's SGL's
+	 * but not for a QP unable to hold any WQE (SQ + RQ)
+	 */
+	if (attrs->cap.max_send_wr + attrs->cap.max_recv_wr == 0) {
+		rv = -EINVAL;
+		goto err_out;
+	}
+
+	scq = siw_cq_id2obj(sdev, ((struct siw_cq *)attrs->send_cq)->hdr.id);
+	rcq = siw_cq_id2obj(sdev, ((struct siw_cq *)attrs->recv_cq)->hdr.id);
+
+	if (!scq || (!rcq && !attrs->srq)) {
+		dprint(DBG_OBJ, ": Fail: SCQ: 0x%p, RCQ: 0x%p\n",
+			scq, rcq);
+		rv = -EINVAL;
+		goto err_out;
+	}
+	qp = kzalloc(sizeof(*qp), GFP_KERNEL);
+	if (!qp) {
+		dprint(DBG_ON, ": kzalloc\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+
+	init_rwsem(&qp->state_lock);
+	spin_lock_init(&qp->sq_lock);
+	spin_lock_init(&qp->rq_lock);
+	spin_lock_init(&qp->orq_lock);
+
+	init_waitqueue_head(&qp->tx_ctx.waitq);
+
+	if (!ofa_pd->uobject)
+		qp->kernel_verbs = 1;
+
+	rv = siw_qp_add(sdev, qp);
+	if (rv)
+		goto err_out;
+
+	num_sqe = roundup_pow_of_two(attrs->cap.max_send_wr);
+	num_rqe = roundup_pow_of_two(attrs->cap.max_recv_wr);
+
+	if (qp->kernel_verbs)
+		qp->sendq = vmalloc(num_sqe * sizeof(struct siw_sqe));
+	else
+		qp->sendq = vmalloc_user(num_sqe * sizeof(struct siw_sqe));
+
+	if (qp->sendq == NULL) {
+		pr_warn("QP(%d): send queue size %d alloc failed\n",
+			QP_ID(qp), num_sqe);
+		rv = -ENOMEM;
+		goto err_out_idr;
+	}
+	if (attrs->sq_sig_type != IB_SIGNAL_REQ_WR) {
+		if (attrs->sq_sig_type == IB_SIGNAL_ALL_WR)
+			qp->attrs.flags |= SIW_SIGNAL_ALL_WR;
+		else {
+			rv = -EINVAL;
+			goto err_out_idr;
+		}
+	}
+	qp->pd  = pd;
+	qp->scq = scq;
+	qp->rcq = rcq;
+
+	if (attrs->srq) {
+		/*
+		 * SRQ support.
+		 * Verbs 6.3.7: ignore RQ size, if SRQ present
+		 * Verbs 6.3.5: do not check PD of SRQ against PD of QP
+		 */
+		qp->srq = siw_srq_ofa2siw(attrs->srq);
+		qp->attrs.rq_size = 0;
+		dprint(DBG_OBJ, " QP(%d): SRQ(%p) attached\n",
+			QP_ID(qp), qp->srq);
+	} else if (num_rqe) {
+		if (qp->kernel_verbs)
+			qp->recvq = vmalloc(num_rqe * sizeof(struct siw_rqe));
+		else
+			qp->recvq = vmalloc_user(num_rqe *
+						 sizeof(struct siw_rqe));
+
+		if (qp->recvq == NULL) {
+			pr_warn("QP(%d): recv queue size %d alloc failed\n",
+				QP_ID(qp), num_rqe);
+			rv = -ENOMEM;
+			goto err_out_idr;
+		}
+
+		qp->attrs.rq_size = num_rqe;
+	}
+	qp->attrs.sq_size = num_sqe;
+	qp->attrs.sq_max_sges = attrs->cap.max_send_sge;
+	/*
+	 * ofed has no max_send_sge_rdmawrite
+	 */
+	qp->attrs.sq_max_sges_rdmaw = attrs->cap.max_send_sge;
+	qp->attrs.rq_max_sges = attrs->cap.max_recv_sge;
+
+	qp->attrs.state = SIW_QP_STATE_IDLE;
+
+	/* vmalloc_user already zeroes SQ and RQ memory */
+	if (qp->kernel_verbs) {
+		if (qp->sendq)
+			memset(qp->sendq, 0, num_sqe * sizeof(struct siw_sqe));
+		if (qp->recvq)
+			memset(qp->recvq, 0, num_rqe * sizeof(struct siw_rqe));
+	}
+	if (udata) {
+		struct siw_uresp_create_qp uresp;
+		struct siw_ucontext *ctx;
+
+		memset(&uresp, 0, sizeof(uresp));
+		ctx = siw_ctx_ofa2siw(ofa_pd->uobject->context);
+
+		uresp.sq_key = uresp.rq_key = SIW_INVAL_UOBJ_KEY;
+		uresp.num_sqe = num_sqe;
+		uresp.num_rqe = num_rqe;
+		uresp.qp_id = QP_ID(qp);
+
+		if (qp->sendq) {
+			uresp.sq_key = siw_insert_uobj(ctx, qp->sendq,
+					num_sqe * sizeof(struct siw_sqe));
+			if (uresp.sq_key > SIW_MAX_UOBJ_KEY)
+				pr_warn("Preparing mmap SQ failed\n");
+		}
+		if (qp->recvq) {
+			uresp.rq_key = siw_insert_uobj(ctx, qp->recvq,
+					num_rqe * sizeof(struct siw_rqe));
+			if (uresp.rq_key > SIW_MAX_UOBJ_KEY)
+				pr_warn("Preparing mmap RQ failed\n");
+		}
+		rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+		if (rv)
+			goto err_out_idr;
+	}
+	atomic_set(&qp->tx_ctx.in_use, 0);
+
+	qp->ofa_qp.qp_num = QP_ID(qp);
+
+	siw_pd_get(pd);
+
+	INIT_LIST_HEAD(&qp->devq);
+	spin_lock_irqsave(&sdev->idr_lock, flags);
+	list_add_tail(&qp->devq, &sdev->qp_list);
+	spin_unlock_irqrestore(&sdev->idr_lock, flags);
+
+	qp->cpu = (smp_processor_id() + 1) % MAX_CPU;
+
+	return &qp->ofa_qp;
+
+err_out_idr:
+	siw_remove_obj(&sdev->idr_lock, &sdev->qp_idr, &qp->hdr);
+err_out:
+	if (scq)
+		siw_cq_put(scq);
+	if (rcq)
+		siw_cq_put(rcq);
+
+	if (qp) {
+		if (qp->sendq)
+			vfree(qp->sendq);
+		if (qp->recvq)
+			vfree(qp->recvq);
+		kfree(qp);
+	}
+	atomic_dec(&sdev->num_qp);
+
+	return ERR_PTR(rv);
+}
+
+/*
+ * Minimum siw_query_qp() verb interface.
+ *
+ * @qp_attr_mask is not used but all available information is provided
+ */
+int siw_query_qp(struct ib_qp *ofa_qp, struct ib_qp_attr *qp_attr,
+		 int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr)
+{
+	struct siw_qp *qp;
+	struct siw_dev *sdev;
+
+	if (ofa_qp && qp_attr && qp_init_attr) {
+		qp = siw_qp_ofa2siw(ofa_qp);
+		sdev = siw_dev_ofa2siw(ofa_qp->device);
+	} else
+		return -EINVAL;
+
+	qp_attr->cap.max_inline_data = SIW_MAX_INLINE;
+	qp_attr->cap.max_send_wr = qp->attrs.sq_size;
+	qp_attr->cap.max_send_sge = qp->attrs.sq_max_sges;
+	qp_attr->cap.max_recv_wr = qp->attrs.rq_size;
+	qp_attr->cap.max_recv_sge = qp->attrs.rq_max_sges;
+	qp_attr->path_mtu = siw_mtu_net2ofa(sdev->netdev->mtu);
+	qp_attr->max_rd_atomic = qp->attrs.irq_size;
+	qp_attr->max_dest_rd_atomic = qp->attrs.orq_size;
+
+	qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
+			IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ;
+
+	qp_init_attr->qp_type = ofa_qp->qp_type;
+	qp_init_attr->send_cq = ofa_qp->send_cq;
+	qp_init_attr->recv_cq = ofa_qp->recv_cq;
+	qp_init_attr->srq = ofa_qp->srq;
+
+	qp_init_attr->cap = qp_attr->cap;
+
+	return 0;
+}
+
+int siw_verbs_modify_qp(struct ib_qp *ofa_qp, struct ib_qp_attr *attr,
+			int attr_mask, struct ib_udata *udata)
+{
+	struct siw_qp_attrs	new_attrs;
+	enum siw_qp_attr_mask	siw_attr_mask = 0;
+	struct siw_qp		*qp = siw_qp_ofa2siw(ofa_qp);
+	int			rv = 0;
+
+	if (!attr_mask) {
+		dprint(DBG_CM, "(QP%d): attr_mask==0 ignored\n", QP_ID(qp));
+		goto out;
+	}
+	siw_dprint_qp_attr_mask(attr_mask);
+
+	memset(&new_attrs, 0, sizeof(new_attrs));
+
+	if (attr_mask & IB_QP_ACCESS_FLAGS) {
+
+		siw_attr_mask |= SIW_QP_ATTR_ACCESS_FLAGS;
+
+		if (attr->qp_access_flags & IB_ACCESS_REMOTE_READ)
+			new_attrs.flags |= SIW_RDMA_READ_ENABLED;
+		if (attr->qp_access_flags & IB_ACCESS_REMOTE_WRITE)
+			new_attrs.flags |= SIW_RDMA_WRITE_ENABLED;
+		if (attr->qp_access_flags & IB_ACCESS_MW_BIND)
+			new_attrs.flags |= SIW_RDMA_BIND_ENABLED;
+	}
+	if (attr_mask & IB_QP_STATE) {
+		dprint(DBG_CM, "(QP%d): Desired IB QP state: %s\n",
+			   QP_ID(qp), ib_qp_state_to_string[attr->qp_state]);
+
+		new_attrs.state = ib_qp_state_to_siw_qp_state[attr->qp_state];
+
+		if (new_attrs.state > SIW_QP_STATE_RTS)
+			qp->tx_ctx.tx_suspend = 1;
+
+		siw_attr_mask |= SIW_QP_ATTR_STATE;
+	}
+	if (!attr_mask)
+		goto out;
+
+	down_write(&qp->state_lock);
+
+	rv = siw_qp_modify(qp, &new_attrs, siw_attr_mask);
+
+	up_write(&qp->state_lock);
+
+out:
+	dprint(DBG_CM, "(QP%d): Exit with %d\n", QP_ID(qp), rv);
+	return rv;
+}
+
+int siw_destroy_qp(struct ib_qp *ofa_qp)
+{
+	struct siw_qp		*qp = siw_qp_ofa2siw(ofa_qp);
+	struct siw_qp_attrs	qp_attrs;
+
+	dprint(DBG_CM, "(QP%d): SIW QP state=%d, cep=0x%p\n",
+		QP_ID(qp), qp->attrs.state, qp->cep);
+
+	/*
+	 * Mark QP as in process of destruction to prevent from eventual async
+	 * callbacks to OFA core
+	 */
+	qp->attrs.flags |= SIW_QP_IN_DESTROY;
+	qp->rx_ctx.rx_suspend = 1;
+
+	down_write(&qp->state_lock);
+
+	qp_attrs.state = SIW_QP_STATE_ERROR;
+	(void)siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE);
+
+	if (qp->cep) {
+		siw_cep_put(qp->cep);
+		qp->cep = NULL;
+	}
+
+	up_write(&qp->state_lock);
+
+	kfree(qp->rx_ctx.mpa_crc_hd);
+	kfree(qp->tx_ctx.mpa_crc_hd);
+
+	/* Drop references */
+	siw_cq_put(qp->scq);
+	siw_cq_put(qp->rcq);
+	siw_pd_put(qp->pd);
+	qp->scq = qp->rcq = NULL;
+
+	siw_qp_put(qp);
+
+	return 0;
+}
+
+/*
+ * siw_copy_sgl()
+ *
+ * Copy SGL from OFA representation to local
+ * representation.
+ */
+static inline void siw_copy_sgl(struct ib_sge *ofa_sge, struct siw_sge *siw_sge,
+			       int num_sge)
+{
+	while (num_sge--) {
+		siw_sge->laddr = ofa_sge->addr;
+		siw_sge->length = ofa_sge->length;
+		siw_sge->lkey = ofa_sge->lkey;
+
+		siw_sge++; ofa_sge++;
+	}
+}
+
+/*
+ * siw_copy_inline_sgl()
+ *
+ * Prepare sgl of inlined data for sending. For userland callers
+ * function checks if given buffer addresses and len's are within
+ * process context bounds.
+ * Data from all provided sge's are copied together into the wqe,
+ * referenced by a single sge.
+ */
+static int siw_copy_inline_sgl(struct ib_send_wr *ofa_wr, struct siw_sqe *sqe)
+{
+	struct ib_sge	*ofa_sge = ofa_wr->sg_list;
+	void		*kbuf	 = &sqe->sge[1];
+	int		num_sge	 = ofa_wr->num_sge,
+			bytes	 = 0;
+
+	sqe->sge[0].laddr = (u64)kbuf;
+	sqe->sge[0].lkey = 0;
+
+	while (num_sge--) {
+		if (!ofa_sge->length) {
+			ofa_sge++;
+			continue;
+		}
+		bytes += ofa_sge->length;
+		if (bytes > SIW_MAX_INLINE) {
+			bytes = -EINVAL;
+			break;
+		}
+		memcpy(kbuf, (void *)(uintptr_t)ofa_sge->addr, ofa_sge->length);
+
+		kbuf += ofa_sge->length;
+		ofa_sge++;
+	}
+	sqe->sge[0].length = bytes > 0 ? bytes : 0;
+	sqe->num_sge = bytes > 0 ? 1 : 0;
+
+	return bytes;
+}
+
+
+/*
+ * siw_post_send()
+ *
+ * Post a list of S-WR's to a SQ.
+ *
+ * @ofa_qp:	OFA QP contained in siw QP
+ * @wr:		Null terminated list of user WR's
+ * @bad_wr:	Points to failing WR in case of synchronous failure.
+ */
+int siw_post_send(struct ib_qp *ofa_qp, struct ib_send_wr *wr,
+		  struct ib_send_wr **bad_wr)
+{
+	struct siw_qp	*qp = siw_qp_ofa2siw(ofa_qp);
+	struct siw_wqe	*wqe = tx_wqe(qp);
+
+	unsigned long flags;
+	int rv = 0;
+
+	dprint(DBG_WR|DBG_TX, "(QP%d): state=%d\n",
+		QP_ID(qp), qp->attrs.state);
+
+	/*
+	 * Try to acquire QP state lock. Must be non-blocking
+	 * to accommodate kernel clients needs.
+	 */
+	if (!down_read_trylock(&qp->state_lock)) {
+		*bad_wr = wr;
+		return -ENOTCONN;
+	}
+
+	if (unlikely(qp->attrs.state != SIW_QP_STATE_RTS)) {
+		dprint(DBG_WR, "(QP%d): state=%d\n",
+			QP_ID(qp), qp->attrs.state);
+		up_read(&qp->state_lock);
+		*bad_wr = wr;
+		return -ENOTCONN;
+	}
+	if (wr && qp->kernel_verbs == 0) {
+		dprint(DBG_WR|DBG_ON, "(QP%d): user mapped SQ with OFA WR\n",
+			QP_ID(qp));
+		up_read(&qp->state_lock);
+		*bad_wr = wr;
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&qp->sq_lock, flags);
+
+	while (wr) {
+		u32 idx = qp->sq_put % qp->attrs.sq_size;
+		struct siw_sqe *sqe = &qp->sendq[idx];
+
+		if (sqe->flags) {
+			dprint(DBG_WR, "(QP%d): SQ full\n", QP_ID(qp));
+			rv = -ENOMEM;
+			break;
+		}
+		if (wr->num_sge > qp->attrs.sq_max_sges) {
+			/*
+			 * NOTE: we allow for zero length wr's here.
+			 */
+			dprint(DBG_WR, "(QP%d): Num SGE: %d\n",
+				QP_ID(qp), wr->num_sge);
+			rv = -EINVAL;
+			break;
+		}
+		sqe->id = wr->wr_id;
+		sqe->flags = 0;
+
+		if ((wr->send_flags & IB_SEND_SIGNALED) ||
+		    (qp->attrs.flags & SIW_SIGNAL_ALL_WR))
+			sqe->flags |= SIW_WQE_SIGNALLED;
+
+		if (wr->send_flags & IB_SEND_FENCE)
+			sqe->flags |= SIW_WQE_READ_FENCE;
+
+
+		switch (wr->opcode) {
+
+		case IB_WR_SEND:
+		case IB_WR_SEND_WITH_INV:
+			if (wr->send_flags & IB_SEND_SOLICITED)
+				sqe->flags |= SIW_WQE_SOLICITED;
+
+			if (!(wr->send_flags & IB_SEND_INLINE)) {
+				siw_copy_sgl(wr->sg_list, sqe->sge,
+					     wr->num_sge);
+				sqe->num_sge = wr->num_sge;
+			} else {
+				rv = siw_copy_inline_sgl(wr, sqe);
+				if (rv <= 0) {
+					rv = -EINVAL;
+					break;
+				}
+				sqe->flags |= SIW_WQE_INLINE;
+				sqe->num_sge = 1;
+			}
+			if (wr->opcode == IB_WR_SEND)
+				sqe->opcode = SIW_OP_SEND;
+			else {
+				sqe->opcode = SIW_OP_SEND_REMOTE_INV;
+				sqe->rkey = wr->ex.invalidate_rkey;
+			}
+			break;
+
+		case IB_WR_RDMA_READ_WITH_INV:
+		case IB_WR_RDMA_READ:
+			/*
+			 * OFED WR restricts RREAD sink to SGL containing
+			 * 1 SGE only. we could relax to SGL with multiple
+			 * elements referring the SAME ltag or even sending
+			 * a private per-rreq tag referring to a checked
+			 * local sgl with MULTIPLE ltag's. would be easy
+			 * to do...
+			 */
+			if (unlikely(wr->num_sge != 1)) {
+				rv = -EINVAL;
+				break;
+			}
+			siw_copy_sgl(wr->sg_list, &sqe->sge[0], 1);
+			/*
+			 * NOTE: zero length RREAD is allowed!
+			 */
+			sqe->raddr	= rdma_wr(wr)->remote_addr;
+			sqe->rkey	= rdma_wr(wr)->rkey;
+			sqe->num_sge	= 1;
+
+			if (wr->opcode == IB_WR_RDMA_READ)
+				sqe->opcode = SIW_OP_READ;
+			else
+				sqe->opcode = SIW_OP_READ_LOCAL_INV;
+			break;
+
+		case IB_WR_RDMA_WRITE:
+			if (!(wr->send_flags & IB_SEND_INLINE)) {
+				siw_copy_sgl(wr->sg_list, &sqe->sge[0],
+					     wr->num_sge);
+				sqe->num_sge = wr->num_sge;
+			} else {
+				rv = siw_copy_inline_sgl(wr, sqe);
+				if (unlikely(rv < 0)) {
+					rv = -EINVAL;
+					break;
+				}
+				sqe->flags |= SIW_WQE_INLINE;
+				sqe->num_sge = 1;
+			}
+			sqe->raddr	= rdma_wr(wr)->remote_addr;
+			sqe->rkey	= rdma_wr(wr)->rkey;
+			sqe->opcode	= SIW_OP_WRITE;
+
+			break;
+
+		case IB_WR_REG_MR:
+			sqe->ofa_mr = (uint64_t)reg_wr(wr)->mr;
+			sqe->rkey = reg_wr(wr)->key;
+			sqe->access = SIW_MEM_LREAD;
+			if (reg_wr(wr)->access & IB_ACCESS_LOCAL_WRITE)
+				sqe->access |= SIW_MEM_LWRITE;
+			if (reg_wr(wr)->access & IB_ACCESS_REMOTE_WRITE)
+				sqe->access |= SIW_MEM_RWRITE;
+			if (reg_wr(wr)->access & IB_ACCESS_REMOTE_READ)
+				sqe->access |= SIW_MEM_RREAD;
+			sqe->opcode = SIW_OP_REG_MR;
+
+			break;
+
+		case IB_WR_LOCAL_INV:
+			sqe->rkey = wr->ex.invalidate_rkey;
+			sqe->opcode = SIW_OP_INVAL_STAG;
+
+			break;
+
+		default:
+			dprint(DBG_WR|DBG_TX|DBG_ON,
+				"(QP%d): IB_WR %d not supported\n",
+				QP_ID(qp), wr->opcode);
+			rv = -EINVAL;
+			break;
+		}
+		dprint(DBG_WR|DBG_TX, "(QP%d): opcode %d, flags 0x%x\n",
+			QP_ID(qp), sqe->opcode, sqe->flags);
+		if (unlikely(rv < 0))
+			break;
+
+		/* make SQE only vaild after completely written */
+		smp_wmb();
+		sqe->flags |= SIW_WQE_VALID;
+
+		qp->sq_put++;
+		wr = wr->next;
+	}
+
+	/*
+	 * Send directly if SQ processing is not in progress.
+	 * Eventual immediate errors (rv < 0) do not affect the involved
+	 * RI resources (Verbs, 8.3.1) and thus do not prevent from SQ
+	 * processing, if new work is already pending. But rv must be passed
+	 * to caller.
+	 */
+	if (wqe->wr_status != SIW_WR_IDLE) {
+		spin_unlock_irqrestore(&qp->sq_lock, flags);
+		goto skip_direct_sending;
+	}
+	rv = siw_activate_tx(qp);
+	spin_unlock_irqrestore(&qp->sq_lock, flags);
+
+	if (rv <= 0)
+		goto skip_direct_sending;
+
+	if (qp->kernel_verbs)
+		siw_sq_start(qp);
+	else {
+		qp->tx_ctx.in_syscall = 1;
+
+		if (siw_qp_sq_process(qp) != 0 && !(qp->tx_ctx.tx_suspend))
+			siw_qp_cm_drop(qp, 0);
+
+		qp->tx_ctx.in_syscall = 0;
+	}
+
+skip_direct_sending:
+
+	up_read(&qp->state_lock);
+
+	if (rv >= 0)
+		return 0;
+	/*
+	 * Immediate error
+	 */
+	dprint(DBG_WR|DBG_ON, "(QP%d): error=%d\n", QP_ID(qp), rv);
+
+	*bad_wr = wr;
+	return rv;
+}
+
+/*
+ * siw_post_receive()
+ *
+ * Post a list of R-WR's to a RQ.
+ *
+ * @ofa_qp:	OFA QP contained in siw QP
+ * @wr:		Null terminated list of user WR's
+ * @bad_wr:	Points to failing WR in case of synchronous failure.
+ */
+int siw_post_receive(struct ib_qp *ofa_qp, struct ib_recv_wr *wr,
+		     struct ib_recv_wr **bad_wr)
+{
+	struct siw_qp	*qp = siw_qp_ofa2siw(ofa_qp);
+	int rv = 0;
+
+	dprint(DBG_WR|DBG_TX, "(QP%d): state=%d\n", QP_ID(qp),
+		qp->attrs.state);
+
+	if (qp->srq) {
+		*bad_wr = wr;
+		return -EOPNOTSUPP; /* what else from errno.h? */
+	}
+	/*
+	 * Try to acquire QP state lock. Must be non-blocking
+	 * to accommodate kernel clients needs.
+	 */
+	if (!down_read_trylock(&qp->state_lock)) {
+		*bad_wr = wr;
+		return -ENOTCONN;
+	}
+	if (qp->kernel_verbs == 0) {
+		dprint(DBG_WR|DBG_ON, "(QP%d): user mapped RQ with OFA WR\n",
+			QP_ID(qp));
+		up_read(&qp->state_lock);
+		*bad_wr = wr;
+		return -EINVAL;
+	}
+	if (qp->attrs.state > SIW_QP_STATE_RTS) {
+		up_read(&qp->state_lock);
+		dprint(DBG_ON, " (QP%d): state=%d\n", QP_ID(qp),
+			qp->attrs.state);
+		*bad_wr = wr;
+		return -EINVAL;
+	}
+	while (wr) {
+		u32 idx = qp->rq_put % qp->attrs.rq_size;
+		struct siw_rqe *rqe = &qp->recvq[idx];
+
+		if (rqe->flags) {
+			dprint(DBG_WR, "(QP%d): RQ full\n", QP_ID(qp));
+			rv = -ENOMEM;
+			break;
+		}
+		if (wr->num_sge > qp->attrs.rq_max_sges) {
+			dprint(DBG_WR|DBG_ON, "(QP%d): Num SGE: %d\n",
+				QP_ID(qp), wr->num_sge);
+			rv = -EINVAL;
+			break;
+		}
+		rqe->id = wr->wr_id;
+		rqe->num_sge = wr->num_sge;
+		siw_copy_sgl(wr->sg_list, rqe->sge, wr->num_sge);
+
+		/* make sure RQE is completely written before valid */
+		smp_wmb();
+
+		rqe->flags = SIW_WQE_VALID;
+
+
+		qp->rq_put++;
+		wr = wr->next;
+	}
+	if (rv < 0) {
+		dprint(DBG_WR|DBG_ON, "(QP%d): error=%d\n", QP_ID(qp), rv);
+		*bad_wr = wr;
+	}
+	up_read(&qp->state_lock);
+
+	return rv > 0 ? 0 : rv;
+}
+
+int siw_destroy_cq(struct ib_cq *ofa_cq)
+{
+	struct siw_cq		*cq  = siw_cq_ofa2siw(ofa_cq);
+	struct ib_device	*ofa_dev = ofa_cq->device;
+	struct siw_dev		*sdev = siw_dev_ofa2siw(ofa_dev);
+
+	siw_cq_flush(cq);
+
+	siw_remove_obj(&sdev->idr_lock, &sdev->cq_idr, &cq->hdr);
+	siw_cq_put(cq);
+
+	return 0;
+}
+
+/*
+ * siw_create_cq()
+ *
+ * Create CQ of requested size on given device.
+ *
+ * @ofa_dev:	OFA device contained in siw device
+ * @size:	maximum number of CQE's allowed.
+ * @ib_context: user context.
+ * @udata:	used to provide CQ ID back to user.
+ */
+
+struct ib_cq *siw_create_cq(struct ib_device *ofa_dev,
+			    const struct ib_cq_init_attr *attr,
+			    struct ib_ucontext *ib_context,
+			    struct ib_udata *udata)
+{
+	struct siw_cq			*cq = NULL;
+	struct siw_dev			*sdev = siw_dev_ofa2siw(ofa_dev);
+	struct siw_uresp_create_cq	uresp;
+	int rv, size = attr->cqe;
+
+	if (!ofa_dev) {
+		pr_warn("NO OFA device\n");
+		rv = -ENODEV;
+		goto err_out;
+	}
+	if (atomic_inc_return(&sdev->num_cq) > SIW_MAX_CQ) {
+		dprint(DBG_ON, ": Out of CQ's\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (size < 1 || size > SIW_MAX_CQE) {
+		dprint(DBG_ON, ": CQE: %d\n", size);
+		rv = -EINVAL;
+		goto err_out;
+	}
+	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
+	if (!cq) {
+		dprint(DBG_ON, ":  kmalloc\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	size = roundup_pow_of_two(size);
+	cq->ofa_cq.cqe = size;
+	cq->num_cqe = size;
+
+	if (!ib_context) {
+		cq->kernel_verbs = 1;
+		cq->queue = vmalloc(size * sizeof(struct siw_cqe)
+				+ sizeof(struct siw_cq_ctrl));
+	} else
+		cq->queue = vmalloc_user(size * sizeof(struct siw_cqe)
+				+ sizeof(struct siw_cq_ctrl));
+
+	if (cq->queue == NULL) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (cq->kernel_verbs)
+		memset(cq->queue, 0, size * sizeof(struct siw_cqe)
+			+ sizeof(struct siw_cq_ctrl));
+
+	rv = siw_cq_add(sdev, cq);
+	if (rv)
+		goto err_out;
+
+	spin_lock_init(&cq->lock);
+
+	cq->notify = &((struct siw_cq_ctrl *)&cq->queue[size])->notify;
+
+	if (!cq->kernel_verbs) {
+		struct siw_ucontext *ctx = siw_ctx_ofa2siw(ib_context);
+
+		uresp.cq_key = siw_insert_uobj(ctx, cq->queue,
+					size * sizeof(struct siw_cqe) +
+					sizeof(struct siw_cq_ctrl));
+
+		if (uresp.cq_key > SIW_MAX_UOBJ_KEY)
+			pr_warn("Preparing mmap CQ failed\n");
+
+		uresp.cq_id = OBJ_ID(cq);
+		uresp.num_cqe = size;
+
+		rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+		if (rv)
+			goto err_out_idr;
+	}
+	return &cq->ofa_cq;
+
+err_out_idr:
+	siw_remove_obj(&sdev->idr_lock, &sdev->cq_idr, &cq->hdr);
+err_out:
+	dprint(DBG_OBJ, ": CQ creation failed %d", rv);
+
+	if (cq && cq->queue)
+		vfree(cq->queue);
+
+	kfree(cq);
+	atomic_dec(&sdev->num_cq);
+
+	return ERR_PTR(rv);
+}
+
+/*
+ * siw_poll_cq()
+ *
+ * Reap CQ entries if available and copy work completion status into
+ * array of WC's provided by caller. Returns number of reaped CQE's.
+ *
+ * @ofa_cq:	OFA CQ contained in siw CQ.
+ * @num_cqe:	Maximum number of CQE's to reap.
+ * @wc:		Array of work completions to be filled by siw.
+ */
+int siw_poll_cq(struct ib_cq *ofa_cq, int num_cqe, struct ib_wc *wc)
+{
+	struct siw_cq		*cq  = siw_cq_ofa2siw(ofa_cq);
+	int			i;
+
+	for (i = 0; i < num_cqe; i++) {
+		if (!(siw_reap_cqe(cq, wc)))
+			break;
+		wc++;
+	}
+	return i;
+}
+
+/*
+ * siw_req_notify_cq()
+ *
+ * Request notification for new CQE's added to that CQ.
+ * Defined flags:
+ * o SIW_CQ_NOTIFY_SOLICITED lets siw trigger a notification
+ *   event if a WQE with notification flag set enters the CQ
+ * o SIW_CQ_NOTIFY_NEXT_COMP lets siw trigger a notification
+ *   event if a WQE enters the CQ.
+ * o IB_CQ_REPORT_MISSED_EVENTS: return value will provide the
+ *   number of not reaped CQE's regardless of its notification
+ *   type and current or new CQ notification settings.
+ *
+ * @ofa_cq:	OFA CQ contained in siw CQ.
+ * @flags:	Requested notification flags.
+ */
+int siw_req_notify_cq(struct ib_cq *ofa_cq, enum ib_cq_notify_flags flags)
+{
+	struct siw_cq	 *cq  = siw_cq_ofa2siw(ofa_cq);
+
+	dprint(DBG_EH|DBG_CQ, "(CQ%d:) flags: 0x%8x\n", OBJ_ID(cq), flags);
+
+	if ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
+		/* CQ event for next solicited completion */
+		smp_store_mb(*cq->notify, SIW_NOTIFY_SOLICITED);
+	else
+		/* CQ event for any signalled completion */
+		smp_store_mb(*cq->notify, SIW_NOTIFY_ALL);
+
+	if (flags & IB_CQ_REPORT_MISSED_EVENTS)
+		return cq->cq_put - cq->cq_get;
+	return 0;
+}
+
+/*
+ * siw_dereg_mr()
+ *
+ * Release Memory Region.
+ *
+ * TODO: Update function if Memory Windows are supported by siw:
+ *       Is OFED core checking for MW dependencies for current
+ *       MR before calling MR deregistration?.
+ *
+ * @ofa_mr:     OFA MR contained in siw MR.
+ */
+int siw_dereg_mr(struct ib_mr *ofa_mr)
+{
+	struct siw_mr	*mr;
+	struct siw_dev	*sdev = siw_dev_ofa2siw(ofa_mr->device);
+
+	mr = siw_mr_ofa2siw(ofa_mr);
+
+	dprint(DBG_OBJ|DBG_MM, "(MEM%d): Dereg MR, object %p, #ref's: %d\n",
+		mr->mem.hdr.id, mr->mem_obj,
+		refcount_read(&mr->mem.hdr.ref));
+
+	mr->mem.stag_valid = 0;
+
+	siw_pd_put(mr->pd);
+	siw_remove_obj(&sdev->idr_lock, &sdev->mem_idr, &mr->mem.hdr);
+	siw_mem_put(&mr->mem);
+
+	return 0;
+}
+
+static struct siw_mr *siw_create_mr(struct siw_dev *sdev, void *mem_obj,
+				    u64 start, u64 len, int rights)
+{
+	struct siw_mr *mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+
+	if (!mr)
+		return NULL;
+
+	mr->mem.stag_valid = 0;
+
+	if (siw_mem_add(sdev, &mr->mem) < 0) {
+		dprint(DBG_ON, ": siw_mem_add\n");
+		kfree(mr);
+		return NULL;
+	}
+	dprint(DBG_OBJ|DBG_MM, "(MEM%d): New MR, object %p\n",
+		mr->mem.hdr.id, mem_obj);
+
+	mr->ofa_mr.lkey = mr->ofa_mr.rkey = mr->mem.hdr.id << 8;
+
+	mr->mem.va  = start;
+	mr->mem.len = len;
+	mr->mem.mr  = NULL;
+	mr->mem.perms = SIW_MEM_LREAD | /* not selectable in OFA */
+		(rights & IB_ACCESS_REMOTE_READ  ? SIW_MEM_RREAD  : 0) |
+		(rights & IB_ACCESS_LOCAL_WRITE  ? SIW_MEM_LWRITE : 0) |
+		(rights & IB_ACCESS_REMOTE_WRITE ? SIW_MEM_RWRITE : 0);
+
+	mr->mem_obj = mem_obj;
+
+	return mr;
+}
+
+/*
+ * siw_reg_user_mr()
+ *
+ * Register Memory Region.
+ *
+ * @ofa_pd:	OFA PD contained in siw PD.
+ * @start:	starting address of MR (virtual address)
+ * @len:	len of MR
+ * @rnic_va:	not used by siw
+ * @rights:	MR access rights
+ * @udata:	user buffer to communicate STag and Key.
+ */
+struct ib_mr *siw_reg_user_mr(struct ib_pd *ofa_pd, u64 start, u64 len,
+			      u64 rnic_va, int rights, struct ib_udata *udata)
+{
+	struct siw_mr		*mr = NULL;
+	struct siw_pd		*pd = siw_pd_ofa2siw(ofa_pd);
+	struct siw_umem		*umem = NULL;
+	struct siw_ureq_reg_mr	ureq;
+	struct siw_uresp_reg_mr	uresp;
+	struct siw_dev		*sdev = pd->hdr.sdev;
+
+	unsigned long mem_limit = rlimit(RLIMIT_MEMLOCK);
+	int rv;
+
+	dprint(DBG_MM|DBG_OBJ,
+		" start: 0x%016llx, va: 0x%016llx, len: %llu, ctx: %p\n",
+		(unsigned long long)start, (unsigned long long)rnic_va,
+		(unsigned long long)len, ofa_pd->uobject->context);
+
+	if (atomic_inc_return(&sdev->num_mem) > SIW_MAX_MR) {
+		dprint(DBG_ON, ": Out of MRs: %d\n",
+			atomic_read(&sdev->num_mem));
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (!len) {
+		rv = -EINVAL;
+		goto err_out;
+	}
+	if (mem_limit != RLIM_INFINITY) {
+		unsigned long num_pages =
+			(PAGE_ALIGN(len + (start & ~PAGE_MASK))) >> PAGE_SHIFT;
+		mem_limit >>= PAGE_SHIFT;
+
+		if (num_pages > mem_limit - current->mm->locked_vm) {
+			dprint(DBG_ON|DBG_MM,
+				": pages req: %lu, limit: %lu, locked: %lu\n",
+				num_pages, mem_limit, current->mm->locked_vm);
+			rv = -ENOMEM;
+			goto err_out;
+		}
+	}
+	umem = siw_umem_get(start, len);
+	if (IS_ERR(umem)) {
+		dprint(DBG_MM, " siw_umem_get:%ld LOCKED:%lu, LIMIT:%lu\n",
+			PTR_ERR(umem), current->mm->locked_vm,
+			current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >>
+			PAGE_SHIFT);
+		rv = PTR_ERR(umem);
+		umem = NULL;
+		goto err_out;
+	}
+	mr = siw_create_mr(sdev, umem, start, len, rights);
+	if (!mr) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+
+	if (udata) {
+		rv = ib_copy_from_udata(&ureq, udata, sizeof(ureq));
+		if (rv)
+			goto err_out_mr;
+
+		mr->ofa_mr.lkey |= ureq.stag_key;
+		mr->ofa_mr.rkey |= ureq.stag_key; /* XXX ??? */
+		uresp.stag = mr->ofa_mr.lkey;
+
+		rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+		if (rv)
+			goto err_out_mr;
+	}
+	mr->pd = pd;
+	siw_pd_get(pd);
+
+	mr->mem.stag_valid = 1;
+
+	return &mr->ofa_mr;
+
+err_out_mr:
+	siw_remove_obj(&sdev->idr_lock, &sdev->mem_idr, &mr->mem.hdr);
+	kfree(mr);
+
+err_out:
+	if (umem)
+		siw_umem_release(umem);
+
+	atomic_dec(&sdev->num_mem);
+
+	return ERR_PTR(rv);
+}
+
+struct ib_mr *siw_alloc_mr(struct ib_pd *ofa_pd, enum ib_mr_type mr_type,
+			   u32 max_sge)
+{
+	struct siw_mr	*mr;
+	struct siw_pd	*pd = siw_pd_ofa2siw(ofa_pd);
+	struct siw_dev	*sdev = pd->hdr.sdev;
+	struct siw_pbl	*pbl = NULL;
+	int rv;
+
+	if (atomic_inc_return(&sdev->num_mem) > SIW_MAX_MR) {
+		dprint(DBG_ON, ": Out of MRs: %d\n",
+			atomic_read(&sdev->num_mem));
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (mr_type != IB_MR_TYPE_MEM_REG) {
+		dprint(DBG_ON, ": Unsupported MR type's: %d\n", mr_type);
+		rv = -EOPNOTSUPP;
+		goto err_out;
+	}
+	if (max_sge > SIW_MAX_SGE_PBL) {
+		dprint(DBG_ON, ": Too many SGE's: %d\n", max_sge);
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	pbl = siw_pbl_alloc(max_sge);
+	if (IS_ERR(pbl)) {
+		rv = PTR_ERR(pbl);
+		dprint(DBG_ON, ": siw_pbl_alloc failed: %d\n", rv);
+		pbl = NULL;
+		goto err_out;
+	}
+	mr = siw_create_mr(sdev, pbl, 0, max_sge * PAGE_SIZE, 0);
+	if (!mr) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	mr->mem.is_pbl = 1;
+	mr->pd = pd;
+	siw_pd_get(pd);
+
+	dprint(DBG_MM, " MEM(%d): Created with %u SGEs\n", OBJ_ID(&mr->mem),
+		max_sge);
+
+	return &mr->ofa_mr;
+
+err_out:
+	if (pbl)
+		siw_pbl_free(pbl);
+
+	dprint(DBG_ON, ": failed: %d\n", rv);
+
+	atomic_dec(&sdev->num_mem);
+
+	return ERR_PTR(rv);
+}
+
+/* Just used to count number of pages being mapped */
+static int siw_set_pbl_page(struct ib_mr *ofa_mr, u64 buf_addr)
+{
+	return 0;
+}
+
+int siw_map_mr_sg(struct ib_mr *ofa_mr, struct scatterlist *sl, int num_sle,
+		  unsigned int *sg_off)
+{
+	struct scatterlist *slp;
+	struct siw_mr *mr = siw_mr_ofa2siw(ofa_mr);
+	struct siw_pbl *pbl = mr->pbl;
+	struct siw_pble *pble = pbl->pbe;
+	u64 pbl_size;
+	int i, rv;
+
+	if (!pbl) {
+		dprint(DBG_ON, ": No PBL allocated\n");
+		return -EINVAL;
+	}
+	if (pbl->max_buf < num_sle) {
+		dprint(DBG_ON, ": Too many SG entries: %u : %u\n",
+			mr->pbl->max_buf, num_sle);
+		return -ENOMEM;
+	}
+
+	for_each_sg(sl, slp, num_sle, i) {
+		if (sg_dma_len(slp) == 0) {
+			pr_warn("%s: empty sge\n", __func__);
+			return -EINVAL;
+		}
+		if (i == 0) {
+			pble->addr = sg_dma_address(slp);
+			pble->size = sg_dma_len(slp);
+			pble->pbl_off = 0;
+			pbl_size = pble->size;
+			pbl->num_buf = 1;
+			continue;
+		}
+		/* Merge PBL entries if adjacent */
+		if (pble->addr + pble->size == sg_dma_address(slp))
+			pble->size += sg_dma_len(slp);
+		else {
+			pble++;
+			pbl->num_buf++;
+			pble->addr = sg_dma_address(slp);
+			pble->size = sg_dma_len(slp);
+			pble->pbl_off = pbl_size;
+		}
+		pbl_size += sg_dma_len(slp);
+
+		dprint(DBG_MM,
+			" MEM(%d): SGE[%d], size %llu, addr %p, total %llu\n",
+			OBJ_ID(&mr->mem), i, pble->size, (void *)pble->addr,
+			pbl_size);
+	}
+	rv = ib_sg_to_pages(ofa_mr, sl, num_sle, sg_off, siw_set_pbl_page);
+	if (rv > 0) {
+		mr->mem.len = ofa_mr->length;
+		mr->mem.va = ofa_mr->iova;
+		dprint(DBG_MM, " MEM(%d): %llu byte, %u SLE into %u entries\n",
+			OBJ_ID(&mr->mem), mr->mem.len, num_sle, pbl->num_buf);
+	}
+	return rv;
+}
+
+/*
+ * siw_get_dma_mr()
+ *
+ * Create a (empty) DMA memory region, where no umem is attached.
+ */
+struct ib_mr *siw_get_dma_mr(struct ib_pd *ofa_pd, int rights)
+{
+	struct siw_mr	*mr;
+	struct siw_pd	*pd = siw_pd_ofa2siw(ofa_pd);
+	struct siw_dev	*sdev = pd->hdr.sdev;
+	int rv;
+
+	if (atomic_inc_return(&sdev->num_mem) > SIW_MAX_MR) {
+		dprint(DBG_ON, ": Out of MRs: %d\n",
+			atomic_read(&sdev->num_mem));
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	mr = siw_create_mr(sdev, NULL, 0, ULONG_MAX, rights);
+	if (!mr) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	mr->mem.stag_valid = 1;
+
+	mr->pd = pd;
+	siw_pd_get(pd);
+
+	dprint(DBG_MM, ": MEM(%d): created DMA MR\n", OBJ_ID(&mr->mem));
+
+	return &mr->ofa_mr;
+
+err_out:
+	atomic_dec(&sdev->num_mem);
+
+	return ERR_PTR(rv);
+}
+
+
+/*
+ * siw_create_srq()
+ *
+ * Create Shared Receive Queue of attributes @init_attrs
+ * within protection domain given by @ofa_pd.
+ *
+ * @ofa_pd:	OFA PD contained in siw PD.
+ * @init_attrs:	SRQ init attributes.
+ * @udata:	not used by siw.
+ */
+struct ib_srq *siw_create_srq(struct ib_pd *ofa_pd,
+			      struct ib_srq_init_attr *init_attrs,
+			      struct ib_udata *udata)
+{
+	struct siw_srq		*srq = NULL;
+	struct ib_srq_attr	*attrs = &init_attrs->attr;
+	struct siw_pd		*pd = siw_pd_ofa2siw(ofa_pd);
+	struct siw_dev		*sdev = pd->hdr.sdev;
+
+	int kernel_verbs = ofa_pd->uobject ? 0 : 1;
+	int rv;
+
+	if (atomic_inc_return(&sdev->num_srq) > SIW_MAX_SRQ) {
+		dprint(DBG_ON, " Out of SRQ's\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (attrs->max_wr == 0 || attrs->max_wr > SIW_MAX_SRQ_WR ||
+	    attrs->max_sge > SIW_MAX_SGE || attrs->srq_limit > attrs->max_wr) {
+		rv = -EINVAL;
+		goto err_out;
+	}
+
+	srq = kzalloc(sizeof(*srq), GFP_KERNEL);
+	if (!srq) {
+		dprint(DBG_ON, " malloc\n");
+		rv = -ENOMEM;
+		goto err_out;
+	}
+
+	srq->max_sge = attrs->max_sge;
+	srq->num_rqe = roundup_pow_of_two(attrs->max_wr);
+	atomic_set(&srq->space, srq->num_rqe);
+
+	srq->limit = attrs->srq_limit;
+	if (srq->limit)
+		srq->armed = 1;
+
+	if (kernel_verbs)
+		srq->recvq = vmalloc(srq->num_rqe * sizeof(struct siw_rqe));
+	else
+		srq->recvq = vmalloc_user(srq->num_rqe *
+					  sizeof(struct siw_rqe));
+
+	if (srq->recvq == NULL) {
+		rv = -ENOMEM;
+		goto err_out;
+	}
+	if (kernel_verbs) {
+		memset(srq->recvq, 0, srq->num_rqe * sizeof(struct siw_rqe));
+		srq->kernel_verbs = 1;
+	} else if (udata) {
+		struct siw_uresp_create_srq uresp;
+		struct siw_ucontext *ctx;
+
+		memset(&uresp, 0, sizeof(uresp));
+		ctx = siw_ctx_ofa2siw(ofa_pd->uobject->context);
+
+		uresp.num_rqe = srq->num_rqe;
+		uresp.srq_key = siw_insert_uobj(ctx, srq->recvq,
+					srq->num_rqe * sizeof(struct siw_rqe));
+
+		if (uresp.srq_key > SIW_MAX_UOBJ_KEY)
+			pr_warn("Preparing mmap SRQ failed\n");
+
+		rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+		if (rv)
+			goto err_out;
+	}
+	srq->pd	= pd;
+	siw_pd_get(pd);
+
+	spin_lock_init(&srq->lock);
+
+	dprint(DBG_OBJ|DBG_CM, ": new SRQ on device %s\n",
+		sdev->ofa_dev.name);
+	return &srq->ofa_srq;
+
+err_out:
+	if (srq) {
+		if (srq->recvq)
+			vfree(srq->recvq);
+		kfree(srq);
+	}
+	atomic_dec(&sdev->num_srq);
+
+	return ERR_PTR(rv);
+}
+
+/*
+ * siw_modify_srq()
+ *
+ * Modify SRQ. The caller may resize SRQ and/or set/reset notification
+ * limit and (re)arm IB_EVENT_SRQ_LIMIT_REACHED notification.
+ *
+ * NOTE: it is unclear if OFA allows for changing the MAX_SGE
+ * parameter. siw_modify_srq() does not check the attrs->max_sge param.
+ */
+int siw_modify_srq(struct ib_srq *ofa_srq, struct ib_srq_attr *attrs,
+		   enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
+{
+	struct siw_srq	*srq = siw_srq_ofa2siw(ofa_srq);
+	unsigned long	flags;
+	int rv = 0;
+
+	spin_lock_irqsave(&srq->lock, flags);
+
+	if (attr_mask & IB_SRQ_MAX_WR) {
+		/* resize request not yet supported */
+		rv = -EOPNOTSUPP;
+		goto out;
+	}
+	if (attr_mask & IB_SRQ_LIMIT) {
+		if (attrs->srq_limit) {
+			if (unlikely(attrs->srq_limit > srq->num_rqe)) {
+				rv = -EINVAL;
+				goto out;
+			}
+			srq->armed = 1;
+		} else
+			srq->armed = 0;
+
+		srq->limit = attrs->srq_limit;
+	}
+out:
+	spin_unlock_irqrestore(&srq->lock, flags);
+
+	return rv;
+}
+
+/*
+ * siw_query_srq()
+ *
+ * Query SRQ attributes.
+ */
+int siw_query_srq(struct ib_srq *ofa_srq, struct ib_srq_attr *attrs)
+{
+	struct siw_srq	*srq = siw_srq_ofa2siw(ofa_srq);
+	unsigned long	flags;
+
+	spin_lock_irqsave(&srq->lock, flags);
+
+	attrs->max_wr = srq->num_rqe;
+	attrs->max_sge = srq->max_sge;
+	attrs->srq_limit = srq->limit;
+
+	spin_unlock_irqrestore(&srq->lock, flags);
+
+	return 0;
+}
+
+/*
+ * siw_destroy_srq()
+ *
+ * Destroy SRQ.
+ * It is assumed that the SRQ is not referenced by any
+ * QP anymore - the code trusts the OFA environment to keep track
+ * of QP references.
+ */
+int siw_destroy_srq(struct ib_srq *ofa_srq)
+{
+	struct siw_srq		*srq = siw_srq_ofa2siw(ofa_srq);
+	struct siw_dev		*sdev = srq->pd->hdr.sdev;
+
+	dprint(DBG_OBJ, ": Destroy SRQ\n");
+
+	siw_pd_put(srq->pd);
+
+	vfree(srq->recvq);
+	kfree(srq);
+
+	atomic_dec(&sdev->num_srq);
+
+	return 0;
+}
+
+
+/*
+ * siw_post_srq_recv()
+ *
+ * Post a list of receive queue elements to SRQ.
+ * NOTE: The function does not check or lock a certain SRQ state
+ *       during the post operation. The code simply trusts the
+ *       OFA environment.
+ *
+ * @ofa_srq:	OFA SRQ contained in siw SRQ
+ * @wr:		List of R-WR's
+ * @bad_wr:	Updated to failing WR if posting fails.
+ */
+int siw_post_srq_recv(struct ib_srq *ofa_srq, struct ib_recv_wr *wr,
+		      struct ib_recv_wr **bad_wr)
+{
+	struct siw_srq	*srq = siw_srq_ofa2siw(ofa_srq);
+	int rv = 0;
+
+	if (srq->kernel_verbs == 0) {
+		dprint(DBG_WR|DBG_ON, "SRQ %p: mapped SRQ with OFA WR\n", srq);
+		rv = -EINVAL;
+		goto out;
+	}
+	while (wr) {
+		u32 idx = srq->rq_put % srq->num_rqe;
+		struct siw_rqe *rqe = &srq->recvq[idx];
+
+		if (rqe->flags) {
+			dprint(DBG_WR, "SRQ full\n");
+			rv = -ENOMEM;
+			break;
+		}
+		if (wr->num_sge > srq->max_sge) {
+			dprint(DBG_WR|DBG_ON, "Num SGE: %d\n", wr->num_sge);
+			rv = -EINVAL;
+			break;
+		}
+		rqe->id = wr->wr_id;
+		rqe->num_sge = wr->num_sge;
+		siw_copy_sgl(wr->sg_list, rqe->sge, wr->num_sge);
+
+		/* Make sure S-RQE is completely written before valid */
+		smp_wmb();
+
+		rqe->flags = SIW_WQE_VALID;
+
+		srq->rq_put++;
+		wr = wr->next;
+	}
+out:
+	if (unlikely(rv < 0)) {
+		dprint(DBG_WR|DBG_ON, "(SRQ %p): error=%d\n",
+			srq, rv);
+		*bad_wr = wr;
+	}
+	return rv;
+}
diff --git a/drivers/infiniband/sw/siw/siw_verbs.h b/drivers/infiniband/sw/siw/siw_verbs.h
new file mode 100644
index 000000000000..49b970f54672
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_verbs.h
@@ -0,0 +1,119 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
+ *
+ * Copyright (c) 2008-2017, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _SIW_VERBS_H
+#define _SIW_VERBS_H
+
+#include <linux/errno.h>
+
+#include <rdma/iw_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_user_verbs.h>
+
+#include "siw.h"
+#include "siw_cm.h"
+
+
+extern struct ib_ucontext *siw_alloc_ucontext(struct ib_device *ibdev,
+					      struct ib_udata *udata);
+extern int siw_dealloc_ucontext(struct ib_ucontext *ucontext);
+extern int siw_query_port(struct ib_device *ibdev, u8 port,
+			  struct ib_port_attr *attr);
+extern int siw_get_port_immutable(struct ib_device *ibdev, u8 port,
+				  struct ib_port_immutable *port_imm);
+extern int siw_query_device(struct ib_device *ibdev,
+			    struct ib_device_attr *attr,
+			    struct ib_udata *udata);
+extern struct ib_cq *siw_create_cq(struct ib_device *ibdev,
+				   const struct ib_cq_init_attr *attr,
+				   struct ib_ucontext *ucontext,
+				   struct ib_udata *udata);
+extern int siw_no_mad(struct ib_device *ofa_dev, int flags, u8 port,
+		      const struct ib_wc *wc, const struct ib_grh *grh,
+		      const struct ib_mad_hdr *in_mad, size_t in_mad_size,
+		      struct ib_mad_hdr *out_mad, size_t *out_mad_size,
+		      u16 *outmad_pkey_index);
+extern int siw_query_port(struct ib_device *ibdev, u8 port,
+			  struct ib_port_attr *attr);
+extern int siw_query_pkey(struct ib_device *ibdev, u8 port,
+			  u16 idx, u16 *pkey);
+extern int siw_query_gid(struct ib_device *ibdev, u8 port, int idx,
+			 union ib_gid *gid);
+extern struct ib_pd *siw_alloc_pd(struct ib_device *ibdev,
+				  struct ib_ucontext *ucontext,
+				  struct ib_udata *udata);
+extern int siw_dealloc_pd(struct ib_pd *pd);
+extern struct ib_qp *siw_create_qp(struct ib_pd *pd,
+				  struct ib_qp_init_attr *attr,
+				   struct ib_udata *udata);
+extern int siw_query_qp(struct ib_qp *ofa_qp, struct ib_qp_attr *qp_attr,
+			int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr);
+extern int siw_verbs_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+			       int attr_mask, struct ib_udata *udata);
+extern int siw_destroy_qp(struct ib_qp *ibqp);
+extern int siw_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
+			 struct ib_send_wr **bad_wr);
+extern int siw_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
+			    struct ib_recv_wr **bad_wr);
+extern int siw_destroy_cq(struct ib_cq *ibcq);
+extern int siw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
+extern int siw_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags);
+extern struct ib_mr *siw_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
+				     u64 rnic_va, int rights,
+				     struct ib_udata *udata);
+extern struct ib_mr *siw_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
+				  u32 max_sge);
+extern struct ib_mr *siw_get_dma_mr(struct ib_pd *ibpd, int rights);
+extern int siw_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sl,
+			 int num_sle, unsigned int *sg_off);
+extern int siw_dereg_mr(struct ib_mr *ibmr);
+extern struct ib_srq *siw_create_srq(struct ib_pd *ibpd,
+				     struct ib_srq_init_attr *attr,
+				     struct ib_udata *udata);
+extern int siw_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
+			  enum ib_srq_attr_mask mask, struct ib_udata *udata);
+extern int siw_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr);
+extern int siw_destroy_srq(struct ib_srq *ibsrq);
+extern int siw_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
+			     struct ib_recv_wr **bad_wr);
+extern int siw_mmap(struct ib_ucontext *ibctx, struct vm_area_struct *vma);
+
+extern const struct dma_map_ops siw_dma_generic_ops;
+
+#endif
diff --git a/include/uapi/rdma/siw_user.h b/include/uapi/rdma/siw_user.h
new file mode 100644
index 000000000000..9bf1448d54e7
--- /dev/null
+++ b/include/uapi/rdma/siw_user.h
@@ -0,0 +1,220 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt-OA+xvbQnYDHMbYB6QlFGEg@public.gmane.org>
+ *
+ * Copyright (c) 2008-2017, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _SIW_USER_H
+#define _SIW_USER_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#else
+#include <stdint.h>
+#endif
+
+/*Common string that is matched to accept the device by the user library*/
+#define SIW_NODE_DESC_COMMON	"Software iWARP stack"
+
+#define SIW_IBDEV_PREFIX "siw_"
+
+#define VERSION_ID_SOFTIWARP	2
+
+#define SIW_MAX_SGE		6
+#define SIW_MAX_UOBJ_KEY	0xffffff
+#define SIW_INVAL_UOBJ_KEY	(SIW_MAX_UOBJ_KEY + 1)
+
+struct siw_uresp_create_cq {
+	uint32_t	cq_id;
+	uint32_t	num_cqe;
+	uint32_t	cq_key;
+};
+
+struct siw_uresp_create_qp {
+	uint32_t	qp_id;
+	uint32_t	num_sqe;
+	uint32_t	num_rqe;
+	uint32_t	sq_key;
+	uint32_t	rq_key;
+};
+
+struct siw_ureq_reg_mr {
+	uint8_t	stag_key;
+	uint8_t	reserved[3];
+};
+
+struct siw_uresp_reg_mr {
+	uint32_t	stag;
+};
+
+struct siw_uresp_create_srq {
+	uint32_t	num_rqe;
+	uint32_t	srq_key;
+};
+
+struct siw_uresp_alloc_ctx {
+	uint32_t	dev_id;
+};
+
+enum siw_opcode {
+	SIW_OP_WRITE		= 0,
+	SIW_OP_READ		= 1,
+	SIW_OP_READ_LOCAL_INV	= 2,
+	SIW_OP_SEND		= 3,
+	SIW_OP_SEND_WITH_IMM	= 4,
+	SIW_OP_SEND_REMOTE_INV	= 5,
+
+	/* Unsupported */
+	SIW_OP_FETCH_AND_ADD	= 6,
+	SIW_OP_COMP_AND_SWAP	= 7,
+
+	SIW_OP_RECEIVE		= 8,
+	/* provider internal SQE */
+	SIW_OP_READ_RESPONSE	= 9,
+	/*
+	 * below opcodes valid for
+	 * in-kernel clients only
+	 */
+	SIW_OP_INVAL_STAG	= 10,
+	SIW_OP_REG_MR		= 11,
+	SIW_NUM_OPCODES		= 12
+};
+
+/* Keep it same as ibv_sge to allow for memcpy */
+struct siw_sge {
+	uint64_t	laddr;
+	uint32_t	length;
+	uint32_t	lkey;
+};
+
+/*
+ * Inline data are kept within the work request itself occupying
+ * the space of sge[1] .. sge[n]. Therefore, inline data cannot be
+ * supported if SIW_MAX_SGE is below 2 elements.
+ */
+#define SIW_MAX_INLINE	(sizeof(struct siw_sge) * (SIW_MAX_SGE - 1))
+
+#if SIW_MAX_SGE < 2
+#error "SIW_MAX_SGE must be at least 2"
+#endif
+
+enum siw_wqe_flags { 
+	SIW_WQE_VALID           = 1,
+	SIW_WQE_INLINE          = (1 << 1),
+	SIW_WQE_SIGNALLED       = (1 << 2),
+	SIW_WQE_SOLICITED       = (1 << 3),
+	SIW_WQE_READ_FENCE	= (1 << 4),
+	SIW_WQE_COMPLETED       = (1 << 5)
+};
+
+/* Send Queue Element */
+struct siw_sqe {
+	uint64_t	id;
+	uint16_t	flags;
+	uint8_t		num_sge;
+	/* Contains enum siw_opcode values */
+	uint8_t		opcode;
+	uint32_t	rkey;
+	union {
+		uint64_t	raddr;
+		uint64_t	ofa_mr;
+	};
+	union {
+		struct siw_sge	sge[SIW_MAX_SGE];
+		uint32_t	access;
+	};
+};
+
+/* Receive Queue Element */
+struct siw_rqe {
+	uint64_t	id;
+	uint16_t	flags;
+	uint8_t		num_sge;
+	/*
+	 * only used by kernel driver,
+	 * ignored if set by user
+	 */
+	uint8_t		opcode;
+	uint32_t	imm_data;
+	struct siw_sge	sge[SIW_MAX_SGE];
+};
+
+enum siw_notify_flags {
+	SIW_NOTIFY_NOT			= (0),
+	SIW_NOTIFY_SOLICITED		= (1 << 0),
+	SIW_NOTIFY_NEXT_COMPLETION	= (1 << 1),
+	SIW_NOTIFY_MISSED_EVENTS	= (1 << 2),
+	SIW_NOTIFY_ALL = SIW_NOTIFY_SOLICITED |
+			SIW_NOTIFY_NEXT_COMPLETION |
+			SIW_NOTIFY_MISSED_EVENTS
+};
+
+enum siw_wc_status {
+	SIW_WC_SUCCESS		= 0,
+	SIW_WC_LOC_LEN_ERR	= 1,
+	SIW_WC_LOC_PROT_ERR	= 2,
+	SIW_WC_LOC_QP_OP_ERR	= 3,
+	SIW_WC_WR_FLUSH_ERR	= 4,
+	SIW_WC_BAD_RESP_ERR	= 5,
+	SIW_WC_LOC_ACCESS_ERR	= 6,
+	SIW_WC_REM_ACCESS_ERR	= 7,
+	SIW_WC_REM_INV_REQ_ERR	= 8,
+	SIW_WC_GENERAL_ERR	= 9,
+	SIW_NUM_WC_STATUS	= 10
+};
+
+struct siw_cqe {
+	uint64_t	id;
+	uint8_t		flags;
+	uint8_t		opcode;
+	uint16_t	status;
+	uint32_t	bytes;
+	uint64_t	imm_data;
+	/* QP number or QP pointer */
+	union { 
+		void	*qp;
+		uint64_t qp_id;
+	};
+};
+
+/*
+ * Shared structure between user and kernel
+ * to control CQ arming.
+ */
+struct siw_cq_ctrl {
+	enum siw_notify_flags	notify;
+};
+
+#endif
-- 
2.13.6

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