rdma/siw: application interface
authorBernard Metzler <bmt@zurich.ibm.com>
Thu, 20 Jun 2019 16:21:27 +0000 (18:21 +0200)
committerJason Gunthorpe <jgg@mellanox.com>
Tue, 2 Jul 2019 20:03:40 +0000 (17:03 -0300)
Broken up commit to add the Soft iWarp RDMA driver.

Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
drivers/infiniband/sw/siw/siw_verbs.c [new file with mode: 0644]
drivers/infiniband/sw/siw/siw_verbs.h [new file with mode: 0644]
include/uapi/rdma/rdma_user_ioctl_cmds.h
include/uapi/rdma/siw-abi.h [new file with mode: 0644]

diff --git a/drivers/infiniband/sw/siw/siw_verbs.c b/drivers/infiniband/sw/siw/siw_verbs.c
new file mode 100644 (file)
index 0000000..32dc79d
--- /dev/null
@@ -0,0 +1,1760 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <linux/xarray.h>
+
+#include <rdma/iw_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_user_verbs.h>
+#include <rdma/uverbs_ioctl.h>
+
+#include "siw.h"
+#include "siw_verbs.h"
+#include "siw_mem.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 char ib_qp_state_to_string[IB_QPS_ERR + 1][sizeof("RESET")] = {
+       [IB_QPS_RESET] = "RESET", [IB_QPS_INIT] = "INIT", [IB_QPS_RTR] = "RTR",
+       [IB_QPS_RTS] = "RTS",     [IB_QPS_SQD] = "SQD",   [IB_QPS_SQE] = "SQE",
+       [IB_QPS_ERR] = "ERR"
+};
+
+static u32 siw_create_uobj(struct siw_ucontext *uctx, void *vaddr, u32 size)
+{
+       struct siw_uobj *uobj;
+       struct xa_limit limit = XA_LIMIT(0, SIW_UOBJ_MAX_KEY);
+       u32 key;
+
+       uobj = kzalloc(sizeof(*uobj), GFP_KERNEL);
+       if (!uobj)
+               return SIW_INVAL_UOBJ_KEY;
+
+       if (xa_alloc_cyclic(&uctx->xa, &key, uobj, limit, &uctx->uobj_nextkey,
+                           GFP_KERNEL) < 0) {
+               kfree(uobj);
+               return SIW_INVAL_UOBJ_KEY;
+       }
+       uobj->size = PAGE_ALIGN(size);
+       uobj->addr = vaddr;
+
+       return key;
+}
+
+static struct siw_uobj *siw_get_uobj(struct siw_ucontext *uctx,
+                                    unsigned long off, u32 size)
+{
+       struct siw_uobj *uobj = xa_load(&uctx->xa, off);
+
+       if (uobj && uobj->size == size)
+               return uobj;
+
+       return NULL;
+}
+
+int siw_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma)
+{
+       struct siw_ucontext *uctx = to_siw_ctx(ctx);
+       struct siw_uobj *uobj;
+       unsigned long off = vma->vm_pgoff;
+       int size = vma->vm_end - vma->vm_start;
+       int rv = -EINVAL;
+
+       /*
+        * Must be page aligned
+        */
+       if (vma->vm_start & (PAGE_SIZE - 1)) {
+               pr_warn("siw: mmap not page aligned\n");
+               goto out;
+       }
+       uobj = siw_get_uobj(uctx, off, size);
+       if (!uobj) {
+               siw_dbg(&uctx->sdev->base_dev, "mmap lookup failed: %lu, %u\n",
+                       off, size);
+               goto out;
+       }
+       rv = remap_vmalloc_range(vma, uobj->addr, 0);
+       if (rv)
+               pr_warn("remap_vmalloc_range failed: %lu, %u\n", off, size);
+out:
+       return rv;
+}
+
+int siw_alloc_ucontext(struct ib_ucontext *base_ctx, struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(base_ctx->device);
+       struct siw_ucontext *ctx = to_siw_ctx(base_ctx);
+       struct siw_uresp_alloc_ctx uresp = {};
+       int rv;
+
+       if (atomic_inc_return(&sdev->num_ctx) > SIW_MAX_CONTEXT) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       xa_init_flags(&ctx->xa, XA_FLAGS_ALLOC);
+       ctx->uobj_nextkey = 0;
+       ctx->sdev = sdev;
+
+       uresp.dev_id = sdev->vendor_part_id;
+
+       if (udata->outlen < sizeof(uresp)) {
+               rv = -EINVAL;
+               goto err_out;
+       }
+       rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+       if (rv)
+               goto err_out;
+
+       siw_dbg(base_ctx->device, "success. now %d context(s)\n",
+               atomic_read(&sdev->num_ctx));
+
+       return 0;
+
+err_out:
+       atomic_dec(&sdev->num_ctx);
+       siw_dbg(base_ctx->device, "failure %d. now %d context(s)\n", rv,
+               atomic_read(&sdev->num_ctx));
+
+       return rv;
+}
+
+void siw_dealloc_ucontext(struct ib_ucontext *base_ctx)
+{
+       struct siw_ucontext *uctx = to_siw_ctx(base_ctx);
+       void *entry;
+       unsigned long index;
+
+       /*
+        * Make sure all user mmap objects are gone. Since QP, CQ
+        * and SRQ destroy routines destroy related objects, nothing
+        * should be found here.
+        */
+       xa_for_each(&uctx->xa, index, entry) {
+               kfree(xa_erase(&uctx->xa, index));
+               pr_warn("siw: dropping orphaned uobj at %lu\n", index);
+       }
+       xa_destroy(&uctx->xa);
+       atomic_dec(&uctx->sdev->num_ctx);
+}
+
+int siw_query_device(struct ib_device *base_dev, struct ib_device_attr *attr,
+                    struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(base_dev);
+
+       if (udata->inlen || udata->outlen)
+               return -EINVAL;
+
+       memset(attr, 0, sizeof(*attr));
+
+       /* Revisit atomic caps if RFC 7306 gets supported */
+       attr->atomic_cap = 0;
+       attr->device_cap_flags =
+               IB_DEVICE_MEM_MGT_EXTENSIONS | IB_DEVICE_ALLOW_USER_UNREG;
+       attr->max_cq = sdev->attrs.max_cq;
+       attr->max_cqe = sdev->attrs.max_cqe;
+       attr->max_fast_reg_page_list_len = SIW_MAX_SGE_PBL;
+       attr->max_fmr = sdev->attrs.max_fmr;
+       attr->max_mr = sdev->attrs.max_mr;
+       attr->max_mw = sdev->attrs.max_mw;
+       attr->max_mr_size = ~0ull;
+       attr->max_pd = sdev->attrs.max_pd;
+       attr->max_qp = sdev->attrs.max_qp;
+       attr->max_qp_init_rd_atom = sdev->attrs.max_ird;
+       attr->max_qp_rd_atom = sdev->attrs.max_ord;
+       attr->max_qp_wr = sdev->attrs.max_qp_wr;
+       attr->max_recv_sge = sdev->attrs.max_sge;
+       attr->max_res_rd_atom = sdev->attrs.max_qp * sdev->attrs.max_ird;
+       attr->max_send_sge = sdev->attrs.max_sge;
+       attr->max_sge_rd = sdev->attrs.max_sge_rd;
+       attr->max_srq = sdev->attrs.max_srq;
+       attr->max_srq_sge = sdev->attrs.max_srq_sge;
+       attr->max_srq_wr = sdev->attrs.max_srq_wr;
+       attr->page_size_cap = PAGE_SIZE;
+       attr->vendor_id = SIW_VENDOR_ID;
+       attr->vendor_part_id = sdev->vendor_part_id;
+
+       memcpy(&attr->sys_image_guid, sdev->netdev->dev_addr, 6);
+
+       return 0;
+}
+
+int siw_query_port(struct ib_device *base_dev, u8 port,
+                  struct ib_port_attr *attr)
+{
+       struct siw_device *sdev = to_siw_dev(base_dev);
+
+       memset(attr, 0, sizeof(*attr));
+
+       attr->active_mtu = attr->max_mtu;
+       attr->active_speed = 2;
+       attr->active_width = 2;
+       attr->gid_tbl_len = 1;
+       attr->max_msg_sz = -1;
+       attr->max_mtu = ib_mtu_int_to_enum(sdev->netdev->mtu);
+       attr->phys_state = sdev->state == IB_PORT_ACTIVE ? 5 : 3;
+       attr->pkey_tbl_len = 1;
+       attr->port_cap_flags = IB_PORT_CM_SUP | IB_PORT_DEVICE_MGMT_SUP;
+       attr->state = sdev->state;
+       /*
+        * 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 *base_dev, u8 port,
+                          struct ib_port_immutable *port_immutable)
+{
+       struct ib_port_attr attr;
+       int rv = siw_query_port(base_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 *base_dev, u8 port, u16 idx, u16 *pkey)
+{
+       /* Report the default pkey */
+       *pkey = 0xffff;
+       return 0;
+}
+
+int siw_query_gid(struct ib_device *base_dev, u8 port, int idx,
+                 union ib_gid *gid)
+{
+       struct siw_device *sdev = to_siw_dev(base_dev);
+
+       /* subnet_prefix == interface_id == 0; */
+       memset(gid, 0, sizeof(*gid));
+       memcpy(&gid->raw[0], sdev->netdev->dev_addr, 6);
+
+       return 0;
+}
+
+int siw_alloc_pd(struct ib_pd *pd, struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(pd->device);
+
+       if (atomic_inc_return(&sdev->num_pd) > SIW_MAX_PD) {
+               atomic_dec(&sdev->num_pd);
+               return -ENOMEM;
+       }
+       siw_dbg_pd(pd, "now %d PD's(s)\n", atomic_read(&sdev->num_pd));
+
+       return 0;
+}
+
+void siw_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(pd->device);
+
+       siw_dbg_pd(pd, "free PD\n");
+       atomic_dec(&sdev->num_pd);
+}
+
+void siw_qp_get_ref(struct ib_qp *base_qp)
+{
+       siw_qp_get(to_siw_qp(base_qp));
+}
+
+void siw_qp_put_ref(struct ib_qp *base_qp)
+{
+       siw_qp_put(to_siw_qp(base_qp));
+}
+
+/*
+ * siw_create_qp()
+ *
+ * Create QP of requested size on given device.
+ *
+ * @pd:                Protection Domain
+ * @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 *pd,
+                           struct ib_qp_init_attr *attrs,
+                           struct ib_udata *udata)
+{
+       struct siw_qp *qp = NULL;
+       struct siw_base_qp *siw_base_qp = NULL;
+       struct ib_device *base_dev = pd->device;
+       struct siw_device *sdev = to_siw_dev(base_dev);
+       struct siw_ucontext *uctx =
+               rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                         base_ucontext);
+       struct siw_cq *scq = NULL, *rcq = NULL;
+       unsigned long flags;
+       int num_sqe, num_rqe, rv = 0;
+
+       siw_dbg(base_dev, "create new QP\n");
+
+       if (atomic_inc_return(&sdev->num_qp) > SIW_MAX_QP) {
+               siw_dbg(base_dev, "too many QP's\n");
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       if (attrs->qp_type != IB_QPT_RC) {
+               siw_dbg(base_dev, "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)) {
+               siw_dbg(base_dev, "QP size error\n");
+               rv = -EINVAL;
+               goto err_out;
+       }
+       if (attrs->cap.max_inline_data > SIW_MAX_INLINE) {
+               siw_dbg(base_dev, "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) {
+               siw_dbg(base_dev, "QP must have send or receive queue\n");
+               rv = -EINVAL;
+               goto err_out;
+       }
+       scq = to_siw_cq(attrs->send_cq);
+       rcq = to_siw_cq(attrs->recv_cq);
+
+       if (!scq || (!rcq && !attrs->srq)) {
+               siw_dbg(base_dev, "send CQ or receive CQ invalid\n");
+               rv = -EINVAL;
+               goto err_out;
+       }
+       siw_base_qp = kzalloc(sizeof(*siw_base_qp), GFP_KERNEL);
+       if (!siw_base_qp) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       qp = kzalloc(sizeof(*qp), GFP_KERNEL);
+       if (!qp) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       siw_base_qp->qp = qp;
+       qp->ib_qp = &siw_base_qp->base_qp;
+
+       init_rwsem(&qp->state_lock);
+       spin_lock_init(&qp->sq_lock);
+       spin_lock_init(&qp->rq_lock);
+       spin_lock_init(&qp->orq_lock);
+
+       qp->kernel_verbs = !udata;
+       qp->xa_sq_index = SIW_INVAL_UOBJ_KEY;
+       qp->xa_rq_index = SIW_INVAL_UOBJ_KEY;
+
+       rv = siw_qp_add(sdev, qp);
+       if (rv)
+               goto err_out;
+
+       /* All queue indices are derived from modulo operations
+        * on a free running 'get' (consumer) and 'put' (producer)
+        * unsigned counter. Having queue sizes at power of two
+        * avoids handling counter wrap around.
+        */
+       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 = vzalloc(num_sqe * sizeof(struct siw_sqe));
+       else
+               qp->sendq = vmalloc_user(num_sqe * sizeof(struct siw_sqe));
+
+       if (qp->sendq == NULL) {
+               siw_dbg(base_dev, "SQ size %d alloc failed\n", num_sqe);
+               rv = -ENOMEM;
+               goto err_out_xa;
+       }
+       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_xa;
+               }
+       }
+       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 = to_siw_srq(attrs->srq);
+               qp->attrs.rq_size = 0;
+               siw_dbg(base_dev, "QP [%u]: [SRQ 0x%p] attached\n",
+                       qp->qp_num, qp->srq);
+       } else if (num_rqe) {
+               if (qp->kernel_verbs)
+                       qp->recvq = vzalloc(num_rqe * sizeof(struct siw_rqe));
+               else
+                       qp->recvq =
+                               vmalloc_user(num_rqe * sizeof(struct siw_rqe));
+
+               if (qp->recvq == NULL) {
+                       siw_dbg(base_dev, "RQ size %d alloc failed\n", num_rqe);
+                       rv = -ENOMEM;
+                       goto err_out_xa;
+               }
+               qp->attrs.rq_size = num_rqe;
+       }
+       qp->attrs.sq_size = num_sqe;
+       qp->attrs.sq_max_sges = attrs->cap.max_send_sge;
+       qp->attrs.rq_max_sges = attrs->cap.max_recv_sge;
+
+       /* Make those two tunables fixed for now. */
+       qp->tx_ctx.gso_seg_limit = 1;
+       qp->tx_ctx.zcopy_tx = zcopy_tx;
+
+       qp->attrs.state = SIW_QP_STATE_IDLE;
+
+       if (udata) {
+               struct siw_uresp_create_qp uresp = {};
+
+               uresp.num_sqe = num_sqe;
+               uresp.num_rqe = num_rqe;
+               uresp.qp_id = qp_id(qp);
+
+               if (qp->sendq) {
+                       qp->xa_sq_index =
+                               siw_create_uobj(uctx, qp->sendq,
+                                       num_sqe * sizeof(struct siw_sqe));
+               }
+               if (qp->recvq) {
+                       qp->xa_rq_index =
+                                siw_create_uobj(uctx, qp->recvq,
+                                       num_rqe * sizeof(struct siw_rqe));
+               }
+               if (qp->xa_sq_index == SIW_INVAL_UOBJ_KEY ||
+                   qp->xa_rq_index == SIW_INVAL_UOBJ_KEY) {
+                       rv = -ENOMEM;
+                       goto err_out_xa;
+               }
+               uresp.sq_key = qp->xa_sq_index << PAGE_SHIFT;
+               uresp.rq_key = qp->xa_rq_index << PAGE_SHIFT;
+
+               if (udata->outlen < sizeof(uresp)) {
+                       rv = -EINVAL;
+                       goto err_out_xa;
+               }
+               rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+               if (rv)
+                       goto err_out_xa;
+       }
+       qp->tx_cpu = siw_get_tx_cpu(sdev);
+       if (qp->tx_cpu < 0) {
+               rv = -EINVAL;
+               goto err_out_xa;
+       }
+       INIT_LIST_HEAD(&qp->devq);
+       spin_lock_irqsave(&sdev->lock, flags);
+       list_add_tail(&qp->devq, &sdev->qp_list);
+       spin_unlock_irqrestore(&sdev->lock, flags);
+
+       return qp->ib_qp;
+
+err_out_xa:
+       xa_erase(&sdev->qp_xa, qp_id(qp));
+err_out:
+       kfree(siw_base_qp);
+
+       if (qp) {
+               if (qp->xa_sq_index != SIW_INVAL_UOBJ_KEY)
+                       kfree(xa_erase(&uctx->xa, qp->xa_sq_index));
+               if (qp->xa_rq_index != SIW_INVAL_UOBJ_KEY)
+                       kfree(xa_erase(&uctx->xa, qp->xa_rq_index));
+
+               vfree(qp->sendq);
+               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 *base_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_device *sdev;
+
+       if (base_qp && qp_attr && qp_init_attr) {
+               qp = to_siw_qp(base_qp);
+               sdev = to_siw_dev(base_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 = ib_mtu_int_to_enum(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 = base_qp->qp_type;
+       qp_init_attr->send_cq = base_qp->send_cq;
+       qp_init_attr->recv_cq = base_qp->recv_cq;
+       qp_init_attr->srq = base_qp->srq;
+
+       qp_init_attr->cap = qp_attr->cap;
+
+       return 0;
+}
+
+int siw_verbs_modify_qp(struct ib_qp *base_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 = to_siw_qp(base_qp);
+       int rv = 0;
+
+       if (!attr_mask)
+               return 0;
+
+       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) {
+               siw_dbg_qp(qp, "desired IB QP state: %s\n",
+                          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 (!siw_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:
+       return rv;
+}
+
+int siw_destroy_qp(struct ib_qp *base_qp, struct ib_udata *udata)
+{
+       struct siw_qp *qp = to_siw_qp(base_qp);
+       struct siw_base_qp *siw_base_qp = to_siw_base_qp(base_qp);
+       struct siw_ucontext *uctx =
+               rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                         base_ucontext);
+       struct siw_qp_attrs qp_attrs;
+
+       siw_dbg_qp(qp, "state %d, cep 0x%p\n", qp->attrs.state, qp->cep);
+
+       /*
+        * Mark QP as in process of destruction to prevent from
+        * any async callbacks to RDMA core
+        */
+       qp->attrs.flags |= SIW_QP_IN_DESTROY;
+       qp->rx_stream.rx_suspend = 1;
+
+       if (uctx && qp->xa_sq_index != SIW_INVAL_UOBJ_KEY)
+               kfree(xa_erase(&uctx->xa, qp->xa_sq_index));
+       if (uctx && qp->xa_rq_index != SIW_INVAL_UOBJ_KEY)
+               kfree(xa_erase(&uctx->xa, qp->xa_rq_index));
+
+       down_write(&qp->state_lock);
+
+       qp_attrs.state = SIW_QP_STATE_ERROR;
+       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->tx_ctx.mpa_crc_hd);
+       kfree(qp->rx_stream.mpa_crc_hd);
+
+       qp->scq = qp->rcq = NULL;
+
+       siw_qp_put(qp);
+       kfree(siw_base_qp);
+
+       return 0;
+}
+
+/*
+ * 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(const struct ib_send_wr *core_wr,
+                              struct siw_sqe *sqe)
+{
+       struct ib_sge *core_sge = core_wr->sg_list;
+       void *kbuf = &sqe->sge[1];
+       int num_sge = core_wr->num_sge, bytes = 0;
+
+       sqe->sge[0].laddr = (u64)kbuf;
+       sqe->sge[0].lkey = 0;
+
+       while (num_sge--) {
+               if (!core_sge->length) {
+                       core_sge++;
+                       continue;
+               }
+               bytes += core_sge->length;
+               if (bytes > SIW_MAX_INLINE) {
+                       bytes = -EINVAL;
+                       break;
+               }
+               memcpy(kbuf, (void *)(uintptr_t)core_sge->addr,
+                      core_sge->length);
+
+               kbuf += core_sge->length;
+               core_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.
+ *
+ * @base_qp:   Base 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 *base_qp, const struct ib_send_wr *wr,
+                 const struct ib_send_wr **bad_wr)
+{
+       struct siw_qp *qp = to_siw_qp(base_qp);
+       struct siw_wqe *wqe = tx_wqe(qp);
+
+       unsigned long flags;
+       int rv = 0;
+
+       /*
+        * 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;
+               siw_dbg_qp(qp, "QP locked, state %d\n", qp->attrs.state);
+               return -ENOTCONN;
+       }
+       if (unlikely(qp->attrs.state != SIW_QP_STATE_RTS)) {
+               up_read(&qp->state_lock);
+               *bad_wr = wr;
+               siw_dbg_qp(qp, "QP out of state %d\n", qp->attrs.state);
+               return -ENOTCONN;
+       }
+       if (wr && !qp->kernel_verbs) {
+               siw_dbg_qp(qp, "wr must be empty for user mapped sq\n");
+               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) {
+                       siw_dbg_qp(qp, "sq full\n");
+                       rv = -ENOMEM;
+                       break;
+               }
+               if (wr->num_sge > qp->attrs.sq_max_sges) {
+                       siw_dbg_qp(qp, "too many sge's: %d\n", wr->num_sge);
+                       rv = -EINVAL;
+                       break;
+               }
+               sqe->id = wr->wr_id;
+
+               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:
+                       /*
+                        * iWarp 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.
+                        */
+                       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->base_mr = (uint64_t)reg_wr(wr)->mr;
+                       sqe->rkey = reg_wr(wr)->key;
+                       sqe->access = reg_wr(wr)->access & IWARP_ACCESS_MASK;
+                       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:
+                       siw_dbg_qp(qp, "ib wr type %d unsupported\n",
+                                  wr->opcode);
+                       rv = -EINVAL;
+                       break;
+               }
+               siw_dbg_qp(qp, "opcode %d, flags 0x%x, wr_id 0x%p\n",
+                          sqe->opcode, sqe->flags, (void *)sqe->id);
+
+               if (unlikely(rv < 0))
+                       break;
+
+               /* make SQE only valid 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) {
+               rv = 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
+        */
+       siw_dbg_qp(qp, "error %d\n", rv);
+
+       *bad_wr = wr;
+       return rv;
+}
+
+/*
+ * siw_post_receive()
+ *
+ * Post a list of R-WR's to a RQ.
+ *
+ * @base_qp:   Base 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 *base_qp, const struct ib_recv_wr *wr,
+                    const struct ib_recv_wr **bad_wr)
+{
+       struct siw_qp *qp = to_siw_qp(base_qp);
+       unsigned long flags;
+       int rv = 0;
+
+       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) {
+               siw_dbg_qp(qp, "no kernel post_recv for user mapped sq\n");
+               up_read(&qp->state_lock);
+               *bad_wr = wr;
+               return -EINVAL;
+       }
+       if (qp->attrs.state > SIW_QP_STATE_RTS) {
+               up_read(&qp->state_lock);
+               *bad_wr = wr;
+               return -EINVAL;
+       }
+       /*
+        * Serialize potentially multiple producers.
+        * Not needed for single threaded consumer side.
+        */
+       spin_lock_irqsave(&qp->rq_lock, flags);
+
+       while (wr) {
+               u32 idx = qp->rq_put % qp->attrs.rq_size;
+               struct siw_rqe *rqe = &qp->recvq[idx];
+
+               if (rqe->flags) {
+                       siw_dbg_qp(qp, "RQ full\n");
+                       rv = -ENOMEM;
+                       break;
+               }
+               if (wr->num_sge > qp->attrs.rq_max_sges) {
+                       siw_dbg_qp(qp, "too many sge's: %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 RQE is completely written before valid */
+               smp_wmb();
+
+               rqe->flags = SIW_WQE_VALID;
+
+               qp->rq_put++;
+               wr = wr->next;
+       }
+       spin_unlock_irqrestore(&qp->rq_lock, flags);
+
+       up_read(&qp->state_lock);
+
+       if (rv < 0) {
+               siw_dbg_qp(qp, "error %d\n", rv);
+               *bad_wr = wr;
+       }
+       return rv > 0 ? 0 : rv;
+}
+
+void siw_destroy_cq(struct ib_cq *base_cq, struct ib_udata *udata)
+{
+       struct siw_cq *cq = to_siw_cq(base_cq);
+       struct siw_device *sdev = to_siw_dev(base_cq->device);
+       struct siw_ucontext *ctx =
+               rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                         base_ucontext);
+
+       siw_dbg_cq(cq, "free CQ resources\n");
+
+       siw_cq_flush(cq);
+
+       if (ctx && cq->xa_cq_index != SIW_INVAL_UOBJ_KEY)
+               kfree(xa_erase(&ctx->xa, cq->xa_cq_index));
+
+       atomic_dec(&sdev->num_cq);
+
+       vfree(cq->queue);
+}
+
+/*
+ * siw_create_cq()
+ *
+ * Populate CQ of requested size
+ *
+ * @base_cq: CQ as allocated by RDMA midlayer
+ * @attr: Initial CQ attributes
+ * @udata: relates to user context
+ */
+
+int siw_create_cq(struct ib_cq *base_cq, const struct ib_cq_init_attr *attr,
+                 struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(base_cq->device);
+       struct siw_cq *cq = to_siw_cq(base_cq);
+       int rv, size = attr->cqe;
+
+       if (atomic_inc_return(&sdev->num_cq) > SIW_MAX_CQ) {
+               siw_dbg(base_cq->device, "too many CQ's\n");
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       if (size < 1 || size > sdev->attrs.max_cqe) {
+               siw_dbg(base_cq->device, "CQ size error: %d\n", size);
+               rv = -EINVAL;
+               goto err_out;
+       }
+       size = roundup_pow_of_two(size);
+       cq->base_cq.cqe = size;
+       cq->num_cqe = size;
+       cq->xa_cq_index = SIW_INVAL_UOBJ_KEY;
+
+       if (!udata) {
+               cq->kernel_verbs = 1;
+               cq->queue = vzalloc(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;
+       }
+       get_random_bytes(&cq->id, 4);
+       siw_dbg(base_cq->device, "new CQ [%u]\n", cq->id);
+
+       spin_lock_init(&cq->lock);
+
+       cq->notify = &((struct siw_cq_ctrl *)&cq->queue[size])->notify;
+
+       if (udata) {
+               struct siw_uresp_create_cq uresp = {};
+               struct siw_ucontext *ctx =
+                       rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                                 base_ucontext);
+
+               cq->xa_cq_index =
+                       siw_create_uobj(ctx, cq->queue,
+                                       size * sizeof(struct siw_cqe) +
+                                               sizeof(struct siw_cq_ctrl));
+               if (cq->xa_cq_index == SIW_INVAL_UOBJ_KEY) {
+                       rv = -ENOMEM;
+                       goto err_out;
+               }
+               uresp.cq_key = cq->xa_cq_index << PAGE_SHIFT;
+               uresp.cq_id = cq->id;
+               uresp.num_cqe = size;
+
+               if (udata->outlen < sizeof(uresp)) {
+                       rv = -EINVAL;
+                       goto err_out;
+               }
+               rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+               if (rv)
+                       goto err_out;
+       }
+       return 0;
+
+err_out:
+       siw_dbg(base_cq->device, "CQ creation failed: %d", rv);
+
+       if (cq && cq->queue) {
+               struct siw_ucontext *ctx =
+                       rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                                 base_ucontext);
+               if (cq->xa_cq_index != SIW_INVAL_UOBJ_KEY)
+                       kfree(xa_erase(&ctx->xa, cq->xa_cq_index));
+               vfree(cq->queue);
+       }
+       atomic_dec(&sdev->num_cq);
+
+       return 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.
+ *
+ * @base_cq:   Base 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 *base_cq, int num_cqe, struct ib_wc *wc)
+{
+       struct siw_cq *cq = to_siw_cq(base_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.
+ *
+ * @base_cq:   Base CQ contained in siw CQ.
+ * @flags:     Requested notification flags.
+ */
+int siw_req_notify_cq(struct ib_cq *base_cq, enum ib_cq_notify_flags flags)
+{
+       struct siw_cq *cq = to_siw_cq(base_cq);
+
+       siw_dbg_cq(cq, "flags: 0x%02x\n", 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.
+ *
+ * @base_mr: Base MR contained in siw MR.
+ * @udata: points to user context, unused.
+ */
+int siw_dereg_mr(struct ib_mr *base_mr, struct ib_udata *udata)
+{
+       struct siw_mr *mr = to_siw_mr(base_mr);
+       struct siw_device *sdev = to_siw_dev(base_mr->device);
+
+       siw_dbg_mem(mr->mem, "deregister MR\n");
+
+       atomic_dec(&sdev->num_mr);
+
+       siw_mr_drop_mem(mr);
+       kfree_rcu(mr, rcu);
+
+       return 0;
+}
+
+/*
+ * siw_reg_user_mr()
+ *
+ * Register Memory Region.
+ *
+ * @pd:                Protection Domain
+ * @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 *pd, u64 start, u64 len,
+                             u64 rnic_va, int rights, struct ib_udata *udata)
+{
+       struct siw_mr *mr = NULL;
+       struct siw_umem *umem = NULL;
+       struct siw_ureq_reg_mr ureq;
+       struct siw_device *sdev = to_siw_dev(pd->device);
+
+       unsigned long mem_limit = rlimit(RLIMIT_MEMLOCK);
+       int rv;
+
+       siw_dbg_pd(pd, "start: 0x%016llx, va: 0x%016llx, len: %llu\n",
+                  (unsigned long long)start, (unsigned long long)rnic_va,
+                  (unsigned long long)len);
+
+       if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
+               siw_dbg_pd(pd, "too many mr's\n");
+               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) {
+                       siw_dbg_pd(pd, "pages req %lu, max %lu, lock %lu\n",
+                                  num_pages, mem_limit,
+                                  current->mm->locked_vm);
+                       rv = -ENOMEM;
+                       goto err_out;
+               }
+       }
+       umem = siw_umem_get(start, len, ib_access_writable(rights));
+       if (IS_ERR(umem)) {
+               rv = PTR_ERR(umem);
+               siw_dbg_pd(pd, "getting user memory failed: %d\n", rv);
+               umem = NULL;
+               goto err_out;
+       }
+       mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+       if (!mr) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       rv = siw_mr_add_mem(mr, pd, umem, start, len, rights);
+       if (rv)
+               goto err_out;
+
+       if (udata) {
+               struct siw_uresp_reg_mr uresp = {};
+               struct siw_mem *mem = mr->mem;
+
+               if (udata->inlen < sizeof(ureq)) {
+                       rv = -EINVAL;
+                       goto err_out;
+               }
+               rv = ib_copy_from_udata(&ureq, udata, sizeof(ureq));
+               if (rv)
+                       goto err_out;
+
+               mr->base_mr.lkey |= ureq.stag_key;
+               mr->base_mr.rkey |= ureq.stag_key;
+               mem->stag |= ureq.stag_key;
+               uresp.stag = mem->stag;
+
+               if (udata->outlen < sizeof(uresp)) {
+                       rv = -EINVAL;
+                       goto err_out;
+               }
+               rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+               if (rv)
+                       goto err_out;
+       }
+       mr->mem->stag_valid = 1;
+
+       return &mr->base_mr;
+
+err_out:
+       atomic_dec(&sdev->num_mr);
+       if (mr) {
+               if (mr->mem)
+                       siw_mr_drop_mem(mr);
+               kfree_rcu(mr, rcu);
+       } else {
+               if (umem)
+                       siw_umem_release(umem, false);
+       }
+       return ERR_PTR(rv);
+}
+
+struct ib_mr *siw_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
+                          u32 max_sge, struct ib_udata *udata)
+{
+       struct siw_device *sdev = to_siw_dev(pd->device);
+       struct siw_mr *mr = NULL;
+       struct siw_pbl *pbl = NULL;
+       int rv;
+
+       if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
+               siw_dbg_pd(pd, "too many mr's\n");
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       if (mr_type != IB_MR_TYPE_MEM_REG) {
+               siw_dbg_pd(pd, "mr type %d unsupported\n", mr_type);
+               rv = -EOPNOTSUPP;
+               goto err_out;
+       }
+       if (max_sge > SIW_MAX_SGE_PBL) {
+               siw_dbg_pd(pd, "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);
+               siw_dbg_pd(pd, "pbl allocation failed: %d\n", rv);
+               pbl = NULL;
+               goto err_out;
+       }
+       mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+       if (!mr) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       rv = siw_mr_add_mem(mr, pd, pbl, 0, max_sge * PAGE_SIZE, 0);
+       if (rv)
+               goto err_out;
+
+       mr->mem->is_pbl = 1;
+
+       siw_dbg_pd(pd, "[MEM %u]: success\n", mr->mem->stag);
+
+       return &mr->base_mr;
+
+err_out:
+       atomic_dec(&sdev->num_mr);
+
+       if (!mr) {
+               kfree(pbl);
+       } else {
+               if (mr->mem)
+                       siw_mr_drop_mem(mr);
+               kfree_rcu(mr, rcu);
+       }
+       siw_dbg_pd(pd, "failed: %d\n", rv);
+
+       return ERR_PTR(rv);
+}
+
+/* Just used to count number of pages being mapped */
+static int siw_set_pbl_page(struct ib_mr *base_mr, u64 buf_addr)
+{
+       return 0;
+}
+
+int siw_map_mr_sg(struct ib_mr *base_mr, struct scatterlist *sl, int num_sle,
+                 unsigned int *sg_off)
+{
+       struct scatterlist *slp;
+       struct siw_mr *mr = to_siw_mr(base_mr);
+       struct siw_mem *mem = mr->mem;
+       struct siw_pbl *pbl = mem->pbl;
+       struct siw_pble *pble;
+       u64 pbl_size;
+       int i, rv;
+
+       if (!pbl) {
+               siw_dbg_mem(mem, "no PBL allocated\n");
+               return -EINVAL;
+       }
+       pble = pbl->pbe;
+
+       if (pbl->max_buf < num_sle) {
+               siw_dbg_mem(mem, "too many SGE's: %d > %d\n",
+                           mem->pbl->max_buf, num_sle);
+               return -ENOMEM;
+       }
+       for_each_sg(sl, slp, num_sle, i) {
+               if (sg_dma_len(slp) == 0) {
+                       siw_dbg_mem(mem, "empty SGE\n");
+                       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;
+               } else {
+                       /* 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);
+               }
+               siw_dbg_mem(mem,
+                       "sge[%d], size %llu, addr 0x%016llx, total %llu\n",
+                       i, pble->size, pble->addr, pbl_size);
+       }
+       rv = ib_sg_to_pages(base_mr, sl, num_sle, sg_off, siw_set_pbl_page);
+       if (rv > 0) {
+               mem->len = base_mr->length;
+               mem->va = base_mr->iova;
+               siw_dbg_mem(mem,
+                       "%llu bytes, start 0x%016llx, %u SLE to %u entries\n",
+                       mem->len, mem->va, 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 *pd, int rights)
+{
+       struct siw_device *sdev = to_siw_dev(pd->device);
+       struct siw_mr *mr = NULL;
+       int rv;
+
+       if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
+               siw_dbg_pd(pd, "too many mr's\n");
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+       if (!mr) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       rv = siw_mr_add_mem(mr, pd, NULL, 0, ULONG_MAX, rights);
+       if (rv)
+               goto err_out;
+
+       mr->mem->stag_valid = 1;
+
+       siw_dbg_pd(pd, "[MEM %u]: success\n", mr->mem->stag);
+
+       return &mr->base_mr;
+
+err_out:
+       if (rv)
+               kfree(mr);
+
+       atomic_dec(&sdev->num_mr);
+
+       return ERR_PTR(rv);
+}
+
+/*
+ * siw_create_srq()
+ *
+ * Create Shared Receive Queue of attributes @init_attrs
+ * within protection domain given by @pd.
+ *
+ * @base_srq:  Base SRQ contained in siw SRQ.
+ * @init_attrs:        SRQ init attributes.
+ * @udata:     points to user context
+ */
+int siw_create_srq(struct ib_srq *base_srq,
+                  struct ib_srq_init_attr *init_attrs, struct ib_udata *udata)
+{
+       struct siw_srq *srq = to_siw_srq(base_srq);
+       struct ib_srq_attr *attrs = &init_attrs->attr;
+       struct siw_device *sdev = to_siw_dev(base_srq->device);
+       struct siw_ucontext *ctx =
+               rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                         base_ucontext);
+       int rv;
+
+       if (atomic_inc_return(&sdev->num_srq) > SIW_MAX_SRQ) {
+               siw_dbg_pd(base_srq->pd, "too many 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->max_sge = attrs->max_sge;
+       srq->num_rqe = roundup_pow_of_two(attrs->max_wr);
+       srq->xa_srq_index = SIW_INVAL_UOBJ_KEY;
+       srq->limit = attrs->srq_limit;
+       if (srq->limit)
+               srq->armed = 1;
+
+       srq->kernel_verbs = !udata;
+
+       if (udata)
+               srq->recvq =
+                       vmalloc_user(srq->num_rqe * sizeof(struct siw_rqe));
+       else
+               srq->recvq = vzalloc(srq->num_rqe * sizeof(struct siw_rqe));
+
+       if (srq->recvq == NULL) {
+               rv = -ENOMEM;
+               goto err_out;
+       }
+       if (udata) {
+               struct siw_uresp_create_srq uresp = {};
+
+               srq->xa_srq_index = siw_create_uobj(
+                       ctx, srq->recvq, srq->num_rqe * sizeof(struct siw_rqe));
+
+               if (srq->xa_srq_index == SIW_INVAL_UOBJ_KEY) {
+                       rv = -ENOMEM;
+                       goto err_out;
+               }
+               uresp.srq_key = srq->xa_srq_index;
+               uresp.num_rqe = srq->num_rqe;
+
+               if (udata->outlen < sizeof(uresp)) {
+                       rv = -EINVAL;
+                       goto err_out;
+               }
+               rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
+               if (rv)
+                       goto err_out;
+       }
+       spin_lock_init(&srq->lock);
+
+       siw_dbg_pd(base_srq->pd, "[SRQ 0x%p]: success\n", srq);
+
+       return 0;
+
+err_out:
+       if (srq->recvq) {
+               if (ctx && srq->xa_srq_index != SIW_INVAL_UOBJ_KEY)
+                       kfree(xa_erase(&ctx->xa, srq->xa_srq_index));
+               vfree(srq->recvq);
+       }
+       atomic_dec(&sdev->num_srq);
+
+       return 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 RDMA core 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 *base_srq, struct ib_srq_attr *attrs,
+                  enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
+{
+       struct siw_srq *srq = to_siw_srq(base_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 *base_srq, struct ib_srq_attr *attrs)
+{
+       struct siw_srq *srq = to_siw_srq(base_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 RDMA core environment to keep track
+ * of QP references.
+ */
+void siw_destroy_srq(struct ib_srq *base_srq, struct ib_udata *udata)
+{
+       struct siw_srq *srq = to_siw_srq(base_srq);
+       struct siw_device *sdev = to_siw_dev(base_srq->device);
+       struct siw_ucontext *ctx =
+               rdma_udata_to_drv_context(udata, struct siw_ucontext,
+                                         base_ucontext);
+
+       if (ctx && srq->xa_srq_index != SIW_INVAL_UOBJ_KEY)
+               kfree(xa_erase(&ctx->xa, srq->xa_srq_index));
+
+       vfree(srq->recvq);
+       atomic_dec(&sdev->num_srq);
+}
+
+/*
+ * 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
+ *       RDMA core environment.
+ *
+ * @base_srq:  Base 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 *base_srq, const struct ib_recv_wr *wr,
+                     const struct ib_recv_wr **bad_wr)
+{
+       struct siw_srq *srq = to_siw_srq(base_srq);
+       unsigned long flags;
+       int rv = 0;
+
+       if (unlikely(!srq->kernel_verbs)) {
+               siw_dbg_pd(base_srq->pd,
+                          "[SRQ 0x%p]: no kernel post_recv for mapped srq\n",
+                          srq);
+               rv = -EINVAL;
+               goto out;
+       }
+       /*
+        * Serialize potentially multiple producers.
+        * Also needed to serialize potentially multiple
+        * consumers.
+        */
+       spin_lock_irqsave(&srq->lock, flags);
+
+       while (wr) {
+               u32 idx = srq->rq_put % srq->num_rqe;
+               struct siw_rqe *rqe = &srq->recvq[idx];
+
+               if (rqe->flags) {
+                       siw_dbg_pd(base_srq->pd, "SRQ full\n");
+                       rv = -ENOMEM;
+                       break;
+               }
+               if (unlikely(wr->num_sge > srq->max_sge)) {
+                       siw_dbg_pd(base_srq->pd,
+                                  "[SRQ 0x%p]: too many sge's: %d\n", srq,
+                                  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;
+       }
+       spin_unlock_irqrestore(&srq->lock, flags);
+out:
+       if (unlikely(rv < 0)) {
+               siw_dbg_pd(base_srq->pd, "[SRQ 0x%p]: error %d\n", srq, rv);
+               *bad_wr = wr;
+       }
+       return rv;
+}
+
+void siw_qp_event(struct siw_qp *qp, enum ib_event_type etype)
+{
+       struct ib_event event;
+       struct ib_qp *base_qp = qp->ib_qp;
+
+       /*
+        * Do not report asynchronous errors on QP which gets
+        * destroyed via verbs interface (siw_destroy_qp())
+        */
+       if (qp->attrs.flags & SIW_QP_IN_DESTROY)
+               return;
+
+       event.event = etype;
+       event.device = base_qp->device;
+       event.element.qp = base_qp;
+
+       if (base_qp->event_handler) {
+               siw_dbg_qp(qp, "reporting event %d\n", etype);
+               base_qp->event_handler(&event, base_qp->qp_context);
+       }
+}
+
+void siw_cq_event(struct siw_cq *cq, enum ib_event_type etype)
+{
+       struct ib_event event;
+       struct ib_cq *base_cq = &cq->base_cq;
+
+       event.event = etype;
+       event.device = base_cq->device;
+       event.element.cq = base_cq;
+
+       if (base_cq->event_handler) {
+               siw_dbg_cq(cq, "reporting CQ event %d\n", etype);
+               base_cq->event_handler(&event, base_cq->cq_context);
+       }
+}
+
+void siw_srq_event(struct siw_srq *srq, enum ib_event_type etype)
+{
+       struct ib_event event;
+       struct ib_srq *base_srq = &srq->base_srq;
+
+       event.event = etype;
+       event.device = base_srq->device;
+       event.element.srq = base_srq;
+
+       if (base_srq->event_handler) {
+               siw_dbg_pd(srq->base_srq.pd,
+                          "reporting SRQ event %d\n", etype);
+               base_srq->event_handler(&event, base_srq->srq_context);
+       }
+}
+
+void siw_port_event(struct siw_device *sdev, u8 port, enum ib_event_type etype)
+{
+       struct ib_event event;
+
+       event.event = etype;
+       event.device = &sdev->base_dev;
+       event.element.port_num = port;
+
+       siw_dbg(&sdev->base_dev, "reporting port event %d\n", etype);
+
+       ib_dispatch_event(&event);
+}
diff --git a/drivers/infiniband/sw/siw/siw_verbs.h b/drivers/infiniband/sw/siw/siw_verbs.h
new file mode 100644 (file)
index 0000000..1910869
--- /dev/null
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#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_user_verbs.h>
+
+#include "siw.h"
+#include "siw_cm.h"
+
+/*
+ * siw_copy_sgl()
+ *
+ * Copy SGL from RDMA core representation to local
+ * representation.
+ */
+static inline void siw_copy_sgl(struct ib_sge *sge, struct siw_sge *siw_sge,
+                               int num_sge)
+{
+       while (num_sge--) {
+               siw_sge->laddr = sge->addr;
+               siw_sge->length = sge->length;
+               siw_sge->lkey = sge->lkey;
+
+               siw_sge++;
+               sge++;
+       }
+}
+
+int siw_alloc_ucontext(struct ib_ucontext *base_ctx, struct ib_udata *udata);
+void siw_dealloc_ucontext(struct ib_ucontext *base_ctx);
+int siw_query_port(struct ib_device *base_dev, u8 port,
+                  struct ib_port_attr *attr);
+int siw_get_port_immutable(struct ib_device *base_dev, u8 port,
+                          struct ib_port_immutable *port_immutable);
+int siw_query_device(struct ib_device *base_dev, struct ib_device_attr *attr,
+                    struct ib_udata *udata);
+int siw_create_cq(struct ib_cq *base_cq, const struct ib_cq_init_attr *attr,
+                 struct ib_udata *udata);
+int siw_query_port(struct ib_device *base_dev, u8 port,
+                  struct ib_port_attr *attr);
+int siw_query_pkey(struct ib_device *base_dev, u8 port, u16 idx, u16 *pkey);
+int siw_query_gid(struct ib_device *base_dev, u8 port, int idx,
+                 union ib_gid *gid);
+int siw_alloc_pd(struct ib_pd *base_pd, struct ib_udata *udata);
+void siw_dealloc_pd(struct ib_pd *base_pd, struct ib_udata *udata);
+struct ib_qp *siw_create_qp(struct ib_pd *base_pd,
+                           struct ib_qp_init_attr *attr,
+                           struct ib_udata *udata);
+int siw_query_qp(struct ib_qp *base_qp, struct ib_qp_attr *qp_attr,
+                int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr);
+int siw_verbs_modify_qp(struct ib_qp *base_qp, struct ib_qp_attr *attr,
+                       int attr_mask, struct ib_udata *udata);
+int siw_destroy_qp(struct ib_qp *base_qp, struct ib_udata *udata);
+int siw_post_send(struct ib_qp *base_qp, const struct ib_send_wr *wr,
+                 const struct ib_send_wr **bad_wr);
+int siw_post_receive(struct ib_qp *base_qp, const struct ib_recv_wr *wr,
+                    const struct ib_recv_wr **bad_wr);
+void siw_destroy_cq(struct ib_cq *base_cq, struct ib_udata *udata);
+int siw_poll_cq(struct ib_cq *base_cq, int num_entries, struct ib_wc *wc);
+int siw_req_notify_cq(struct ib_cq *base_cq, enum ib_cq_notify_flags flags);
+struct ib_mr *siw_reg_user_mr(struct ib_pd *base_pd, u64 start, u64 len,
+                             u64 rnic_va, int rights, struct ib_udata *udata);
+struct ib_mr *siw_alloc_mr(struct ib_pd *base_pd, enum ib_mr_type mr_type,
+                          u32 max_sge, struct ib_udata *udata);
+struct ib_mr *siw_get_dma_mr(struct ib_pd *base_pd, int rights);
+int siw_map_mr_sg(struct ib_mr *base_mr, struct scatterlist *sl, int num_sle,
+                 unsigned int *sg_off);
+int siw_dereg_mr(struct ib_mr *base_mr, struct ib_udata *udata);
+int siw_create_srq(struct ib_srq *base_srq, struct ib_srq_init_attr *attr,
+                  struct ib_udata *udata);
+int siw_modify_srq(struct ib_srq *base_srq, struct ib_srq_attr *attr,
+                  enum ib_srq_attr_mask mask, struct ib_udata *udata);
+int siw_query_srq(struct ib_srq *base_srq, struct ib_srq_attr *attr);
+void siw_destroy_srq(struct ib_srq *base_srq, struct ib_udata *udata);
+int siw_post_srq_recv(struct ib_srq *base_srq, const struct ib_recv_wr *wr,
+                     const struct ib_recv_wr **bad_wr);
+int siw_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma);
+void siw_qp_event(struct siw_qp *qp, enum ib_event_type type);
+void siw_cq_event(struct siw_cq *cq, enum ib_event_type type);
+void siw_srq_event(struct siw_srq *srq, enum ib_event_type type);
+void siw_port_event(struct siw_device *dev, u8 port, enum ib_event_type type);
+
+#endif
index 26213f49f5c8ea4a06251b67cab3f9cb312ab386..64c14cb0022fa0e906c2b321b6819b2cf1bb8bc2 100644 (file)
@@ -103,6 +103,7 @@ enum rdma_driver_id {
        RDMA_DRIVER_HFI1,
        RDMA_DRIVER_QIB,
        RDMA_DRIVER_EFA,
+       RDMA_DRIVER_SIW,
 };
 
 #endif
diff --git a/include/uapi/rdma/siw-abi.h b/include/uapi/rdma/siw-abi.h
new file mode 100644 (file)
index 0000000..3dd8071
--- /dev/null
@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#ifndef _SIW_USER_H
+#define _SIW_USER_H
+
+#include <linux/types.h>
+
+#define SIW_NODE_DESC_COMMON "Software iWARP stack"
+#define SIW_ABI_VERSION 1
+#define SIW_MAX_SGE 6
+#define SIW_UOBJ_MAX_KEY 0x08FFFF
+#define SIW_INVAL_UOBJ_KEY (SIW_UOBJ_MAX_KEY + 1)
+
+struct siw_uresp_create_cq {
+       __u32 cq_id;
+       __u32 num_cqe;
+       __aligned_u64 cq_key;
+};
+
+struct siw_uresp_create_qp {
+       __u32 qp_id;
+       __u32 num_sqe;
+       __u32 num_rqe;
+       __u32 pad;
+       __aligned_u64 sq_key;
+       __aligned_u64 rq_key;
+};
+
+struct siw_ureq_reg_mr {
+       __u8 stag_key;
+       __u8 reserved[3];
+       __u32 pad;
+};
+
+struct siw_uresp_reg_mr {
+       __u32 stag;
+       __u32 pad;
+};
+
+struct siw_uresp_create_srq {
+       __u32 num_rqe;
+       __u32 pad;
+       __aligned_u64 srq_key;
+};
+
+struct siw_uresp_alloc_ctx {
+       __u32 dev_id;
+       __u32 pad;
+};
+
+enum siw_opcode {
+       SIW_OP_WRITE,
+       SIW_OP_READ,
+       SIW_OP_READ_LOCAL_INV,
+       SIW_OP_SEND,
+       SIW_OP_SEND_WITH_IMM,
+       SIW_OP_SEND_REMOTE_INV,
+
+       /* Unsupported */
+       SIW_OP_FETCH_AND_ADD,
+       SIW_OP_COMP_AND_SWAP,
+
+       SIW_OP_RECEIVE,
+       /* provider internal SQE */
+       SIW_OP_READ_RESPONSE,
+       /*
+        * below opcodes valid for
+        * in-kernel clients only
+        */
+       SIW_OP_INVAL_STAG,
+       SIW_OP_REG_MR,
+       SIW_NUM_OPCODES
+};
+
+/* Keep it same as ibv_sge to allow for memcpy */
+struct siw_sge {
+       __aligned_u64 laddr;
+       __u32 length;
+       __u32 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_REM_INVAL = (1 << 5),
+       SIW_WQE_COMPLETED = (1 << 6)
+};
+
+/* Send Queue Element */
+struct siw_sqe {
+       __aligned_u64 id;
+       __u16 flags;
+       __u8 num_sge;
+       /* Contains enum siw_opcode values */
+       __u8 opcode;
+       __u32 rkey;
+       union {
+               __aligned_u64 raddr;
+               __aligned_u64 base_mr;
+       };
+       union {
+               struct siw_sge sge[SIW_MAX_SGE];
+               __aligned_u64 access;
+       };
+};
+
+/* Receive Queue Element */
+struct siw_rqe {
+       __aligned_u64 id;
+       __u16 flags;
+       __u8 num_sge;
+       /*
+        * only used by kernel driver,
+        * ignored if set by user
+        */
+       __u8 opcode;
+       __u32 unused;
+       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,
+       SIW_WC_LOC_LEN_ERR,
+       SIW_WC_LOC_PROT_ERR,
+       SIW_WC_LOC_QP_OP_ERR,
+       SIW_WC_WR_FLUSH_ERR,
+       SIW_WC_BAD_RESP_ERR,
+       SIW_WC_LOC_ACCESS_ERR,
+       SIW_WC_REM_ACCESS_ERR,
+       SIW_WC_REM_INV_REQ_ERR,
+       SIW_WC_GENERAL_ERR,
+       SIW_NUM_WC_STATUS
+};
+
+struct siw_cqe {
+       __aligned_u64 id;
+       __u8 flags;
+       __u8 opcode;
+       __u16 status;
+       __u32 bytes;
+       union {
+               __aligned_u64 imm_data;
+               __u32 inval_stag;
+       };
+       /* QP number or QP pointer */
+       union {
+               struct ib_qp *base_qp;
+               __aligned_u64 qp_id;
+       };
+};
+
+/*
+ * Shared structure between user and kernel
+ * to control CQ arming.
+ */
+struct siw_cq_ctrl {
+       __aligned_u64 notify;
+};
+#endif