hw/rdma: PVRDMA commands and data-path ops

First PVRDMA sub-module - implementation of the PVRDMA device.
- PVRDMA commands such as create CQ and create MR.
- Data path QP operations - post_send and post_recv.
- Completion handler.

Reviewed-by: Dotan Barak <dotanb@mellanox.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

7 files changed, 1243 insertions, 0 deletions

diff --git a/hw/rdma/Makefile.objs b/hw/rdma/Makefile.objs
index 6a59bf0..44a85f6 100644
--- a/hw/rdma/Makefile.objs
+++ b/hw/rdma/Makefile.objs
@@ -1,3 +1,5 @@
 ifeq ($(CONFIG_RDMA),y)
 obj-$(CONFIG_PCI) += rdma_utils.o rdma_backend.o rdma_rm.o
+obj-$(CONFIG_PCI) += vmw/pvrdma_dev_ring.o vmw/pvrdma_cmd.o \
+                     vmw/pvrdma_qp_ops.o
 endif
diff --git a/hw/rdma/vmw/pvrdma.h b/hw/rdma/vmw/pvrdma.h
new file mode 100644
index 0000000..b05f94a
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma.h
@@ -0,0 +1,122 @@
+/*
+ * QEMU VMWARE paravirtual RDMA device definitions
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef PVRDMA_PVRDMA_H
+#define PVRDMA_PVRDMA_H
+
+#include <hw/pci/pci.h>
+#include <hw/pci/msix.h>
+
+#include "../rdma_backend_defs.h"
+#include "../rdma_rm_defs.h"
+
+#include <standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h>
+#include <standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_dev_api.h>
+#include "pvrdma_dev_ring.h"
+
+/* BARs */
+#define RDMA_MSIX_BAR_IDX    0
+#define RDMA_REG_BAR_IDX     1
+#define RDMA_UAR_BAR_IDX     2
+#define RDMA_BAR0_MSIX_SIZE  (16 * 1024)
+#define RDMA_BAR1_REGS_SIZE  256
+#define RDMA_BAR2_UAR_SIZE   (0x1000 * MAX_UCS) /* each uc gets page */
+
+/* MSIX */
+#define RDMA_MAX_INTRS       3
+#define RDMA_MSIX_TABLE      0x0000
+#define RDMA_MSIX_PBA        0x2000
+
+/* Interrupts Vectors */
+#define INTR_VEC_CMD_RING            0
+#define INTR_VEC_CMD_ASYNC_EVENTS    1
+#define INTR_VEC_CMD_COMPLETION_Q    2
+
+/* HW attributes */
+#define PVRDMA_HW_NAME       "pvrdma"
+#define PVRDMA_HW_VERSION    17
+#define PVRDMA_FW_VERSION    14
+
+typedef struct DSRInfo {
+    dma_addr_t dma;
+    struct pvrdma_device_shared_region *dsr;
+
+    union pvrdma_cmd_req *req;
+    union pvrdma_cmd_resp *rsp;
+
+    struct pvrdma_ring *async_ring_state;
+    PvrdmaRing async;
+
+    struct pvrdma_ring *cq_ring_state;
+    PvrdmaRing cq;
+} DSRInfo;
+
+typedef struct PVRDMADev {
+    PCIDevice parent_obj;
+    MemoryRegion msix;
+    MemoryRegion regs;
+    uint32_t regs_data[RDMA_BAR1_REGS_SIZE];
+    MemoryRegion uar;
+    uint32_t uar_data[RDMA_BAR2_UAR_SIZE];
+    DSRInfo dsr_info;
+    int interrupt_mask;
+    struct ibv_device_attr dev_attr;
+    uint64_t node_guid;
+    char *backend_device_name;
+    uint8_t backend_gid_idx;
+    uint8_t backend_port_num;
+    RdmaBackendDev backend_dev;
+    RdmaDeviceResources rdma_dev_res;
+} PVRDMADev;
+#define PVRDMA_DEV(dev) OBJECT_CHECK(PVRDMADev, (dev), PVRDMA_HW_NAME)
+
+static inline int get_reg_val(PVRDMADev *dev, hwaddr addr, uint32_t *val)
+{
+    int idx = addr >> 2;
+
+    if (idx > RDMA_BAR1_REGS_SIZE) {
+        return -EINVAL;
+    }
+
+    *val = dev->regs_data[idx];
+
+    return 0;
+}
+
+static inline int set_reg_val(PVRDMADev *dev, hwaddr addr, uint32_t val)
+{
+    int idx = addr >> 2;
+
+    if (idx > RDMA_BAR1_REGS_SIZE) {
+        return -EINVAL;
+    }
+
+    dev->regs_data[idx] = val;
+
+    return 0;
+}
+
+static inline void post_interrupt(PVRDMADev *dev, unsigned vector)
+{
+    PCIDevice *pci_dev = PCI_DEVICE(dev);
+
+    if (likely(!dev->interrupt_mask)) {
+        msix_notify(pci_dev, vector);
+    }
+}
+
+int execute_command(PVRDMADev *dev);
+
+#endif
diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
new file mode 100644
index 0000000..293dfed
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma_cmd.c
@@ -0,0 +1,673 @@
+/*
+ * QEMU paravirtual RDMA - Command channel
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <qemu/osdep.h>
+#include <qemu/error-report.h>
+#include <cpu.h>
+#include <linux/types.h>
+#include "hw/hw.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_ids.h"
+
+#include "../rdma_backend.h"
+#include "../rdma_rm.h"
+#include "../rdma_utils.h"
+
+#include "pvrdma.h"
+#include <standard-headers/rdma/vmw_pvrdma-abi.h>
+
+static void *pvrdma_map_to_pdir(PCIDevice *pdev, uint64_t pdir_dma,
+                                uint32_t nchunks, size_t length)
+{
+    uint64_t *dir, *tbl;
+    int tbl_idx, dir_idx, addr_idx;
+    void *host_virt = NULL, *curr_page;
+
+    if (!nchunks) {
+        pr_dbg("nchunks=0\n");
+        return NULL;
+    }
+
+    dir = rdma_pci_dma_map(pdev, pdir_dma, TARGET_PAGE_SIZE);
+    if (!dir) {
+        error_report("PVRDMA: Failed to map to page directory");
+        return NULL;
+    }
+
+    tbl = rdma_pci_dma_map(pdev, dir[0], TARGET_PAGE_SIZE);
+    if (!tbl) {
+        error_report("PVRDMA: Failed to map to page table 0");
+        goto out_unmap_dir;
+    }
+
+    curr_page = rdma_pci_dma_map(pdev, (dma_addr_t)tbl[0], TARGET_PAGE_SIZE);
+    if (!curr_page) {
+        error_report("PVRDMA: Failed to map the first page");
+        goto out_unmap_tbl;
+    }
+
+    host_virt = mremap(curr_page, 0, length, MREMAP_MAYMOVE);
+    if (host_virt == MAP_FAILED) {
+        host_virt = NULL;
+        error_report("PVRDMA: Failed to remap memory for host_virt");
+        goto out_unmap_tbl;
+    }
+
+    rdma_pci_dma_unmap(pdev, curr_page, TARGET_PAGE_SIZE);
+
+    pr_dbg("host_virt=%p\n", host_virt);
+
+    dir_idx = 0;
+    tbl_idx = 1;
+    addr_idx = 1;
+    while (addr_idx < nchunks) {
+        if ((tbl_idx == (TARGET_PAGE_SIZE / sizeof(uint64_t)))) {
+            tbl_idx = 0;
+            dir_idx++;
+            pr_dbg("Mapping to table %d\n", dir_idx);
+            rdma_pci_dma_unmap(pdev, tbl, TARGET_PAGE_SIZE);
+            tbl = rdma_pci_dma_map(pdev, dir[dir_idx], TARGET_PAGE_SIZE);
+            if (!tbl) {
+                error_report("PVRDMA: Failed to map to page table %d", dir_idx);
+                goto out_unmap_host_virt;
+            }
+        }
+
+        pr_dbg("guest_dma[%d]=0x%lx\n", addr_idx, tbl[tbl_idx]);
+
+        curr_page = rdma_pci_dma_map(pdev, (dma_addr_t)tbl[tbl_idx],
+                                     TARGET_PAGE_SIZE);
+        if (!curr_page) {
+            error_report("PVRDMA: Failed to map to page %d, dir %d", tbl_idx,
+                         dir_idx);
+            goto out_unmap_host_virt;
+        }
+
+        mremap(curr_page, 0, TARGET_PAGE_SIZE, MREMAP_MAYMOVE | MREMAP_FIXED,
+               host_virt + TARGET_PAGE_SIZE * addr_idx);
+
+        rdma_pci_dma_unmap(pdev, curr_page, TARGET_PAGE_SIZE);
+
+        addr_idx++;
+
+        tbl_idx++;
+    }
+
+    goto out_unmap_tbl;
+
+out_unmap_host_virt:
+    munmap(host_virt, length);
+    host_virt = NULL;
+
+out_unmap_tbl:
+    rdma_pci_dma_unmap(pdev, tbl, TARGET_PAGE_SIZE);
+
+out_unmap_dir:
+    rdma_pci_dma_unmap(pdev, dir, TARGET_PAGE_SIZE);
+
+    return host_virt;
+}
+
+static int query_port(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_query_port *cmd = &req->query_port;
+    struct pvrdma_cmd_query_port_resp *resp = &rsp->query_port_resp;
+    struct pvrdma_port_attr attrs = {0};
+
+    pr_dbg("port=%d\n", cmd->port_num);
+
+    if (rdma_backend_query_port(&dev->backend_dev,
+                                (struct ibv_port_attr *)&attrs)) {
+        return -ENOMEM;
+    }
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_QUERY_PORT_RESP;
+    resp->hdr.err = 0;
+
+    resp->attrs.state = attrs.state;
+    resp->attrs.max_mtu = attrs.max_mtu;
+    resp->attrs.active_mtu = attrs.active_mtu;
+    resp->attrs.phys_state = attrs.phys_state;
+    resp->attrs.gid_tbl_len = MIN(MAX_PORT_GIDS, attrs.gid_tbl_len);
+    resp->attrs.max_msg_sz = 1024;
+    resp->attrs.pkey_tbl_len = MIN(MAX_PORT_PKEYS, attrs.pkey_tbl_len);
+    resp->attrs.active_width = 1;
+    resp->attrs.active_speed = 1;
+
+    return 0;
+}
+
+static int query_pkey(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_query_pkey *cmd = &req->query_pkey;
+    struct pvrdma_cmd_query_pkey_resp *resp = &rsp->query_pkey_resp;
+
+    pr_dbg("port=%d\n", cmd->port_num);
+    pr_dbg("index=%d\n", cmd->index);
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_QUERY_PKEY_RESP;
+    resp->hdr.err = 0;
+
+    resp->pkey = 0x7FFF;
+    pr_dbg("pkey=0x%x\n", resp->pkey);
+
+    return 0;
+}
+
+static int create_pd(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_pd *cmd = &req->create_pd;
+    struct pvrdma_cmd_create_pd_resp *resp = &rsp->create_pd_resp;
+
+    pr_dbg("context=0x%x\n", cmd->ctx_handle ? cmd->ctx_handle : 0);
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_CREATE_PD_RESP;
+    resp->hdr.err = rdma_rm_alloc_pd(&dev->rdma_dev_res, &dev->backend_dev,
+                                     &resp->pd_handle, cmd->ctx_handle);
+
+    pr_dbg("ret=%d\n", resp->hdr.err);
+    return resp->hdr.err;
+}
+
+static int destroy_pd(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_pd *cmd = &req->destroy_pd;
+
+    pr_dbg("pd_handle=%d\n", cmd->pd_handle);
+
+    rdma_rm_dealloc_pd(&dev->rdma_dev_res, cmd->pd_handle);
+
+    return 0;
+}
+
+static int create_mr(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_mr *cmd = &req->create_mr;
+    struct pvrdma_cmd_create_mr_resp *resp = &rsp->create_mr_resp;
+    PCIDevice *pci_dev = PCI_DEVICE(dev);
+    void *host_virt = NULL;
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_CREATE_MR_RESP;
+
+    pr_dbg("pd_handle=%d\n", cmd->pd_handle);
+    pr_dbg("access_flags=0x%x\n", cmd->access_flags);
+    pr_dbg("flags=0x%x\n", cmd->flags);
+
+    if (!(cmd->flags & PVRDMA_MR_FLAG_DMA)) {
+        host_virt = pvrdma_map_to_pdir(pci_dev, cmd->pdir_dma, cmd->nchunks,
+                                       cmd->length);
+        if (!host_virt) {
+            pr_dbg("Failed to map to pdir\n");
+            resp->hdr.err = -EINVAL;
+            goto out;
+        }
+    }
+
+    resp->hdr.err = rdma_rm_alloc_mr(&dev->rdma_dev_res, cmd->pd_handle,
+                                     cmd->start, cmd->length, host_virt,
+                                     cmd->access_flags, &resp->mr_handle,
+                                     &resp->lkey, &resp->rkey);
+    if (!resp->hdr.err) {
+        munmap(host_virt, cmd->length);
+    }
+
+out:
+    pr_dbg("ret=%d\n", resp->hdr.err);
+    return resp->hdr.err;
+}
+
+static int destroy_mr(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_mr *cmd = &req->destroy_mr;
+
+    pr_dbg("mr_handle=%d\n", cmd->mr_handle);
+
+    rdma_rm_dealloc_mr(&dev->rdma_dev_res, cmd->mr_handle);
+
+    return 0;
+}
+
+static int create_cq_ring(PCIDevice *pci_dev , PvrdmaRing **ring,
+                          uint64_t pdir_dma, uint32_t nchunks, uint32_t cqe)
+{
+    uint64_t *dir = NULL, *tbl = NULL;
+    PvrdmaRing *r;
+    int rc = -EINVAL;
+    char ring_name[MAX_RING_NAME_SZ];
+
+    pr_dbg("pdir_dma=0x%llx\n", (long long unsigned int)pdir_dma);
+    dir = rdma_pci_dma_map(pci_dev, pdir_dma, TARGET_PAGE_SIZE);
+    if (!dir) {
+        pr_dbg("Failed to map to CQ page directory\n");
+        goto out;
+    }
+
+    tbl = rdma_pci_dma_map(pci_dev, dir[0], TARGET_PAGE_SIZE);
+    if (!tbl) {
+        pr_dbg("Failed to map to CQ page table\n");
+        goto out;
+    }
+
+    r = g_malloc(sizeof(*r));
+    *ring = r;
+
+    r->ring_state = (struct pvrdma_ring *)
+        rdma_pci_dma_map(pci_dev, tbl[0], TARGET_PAGE_SIZE);
+
+    if (!r->ring_state) {
+        pr_dbg("Failed to map to CQ ring state\n");
+        goto out_free_ring;
+    }
+
+    sprintf(ring_name, "cq_ring_%lx", pdir_dma);
+    rc = pvrdma_ring_init(r, ring_name, pci_dev, &r->ring_state[1],
+                          cqe, sizeof(struct pvrdma_cqe),
+                          /* first page is ring state */
+                          (dma_addr_t *)&tbl[1], nchunks - 1);
+    if (rc) {
+        goto out_unmap_ring_state;
+    }
+
+    goto out;
+
+out_unmap_ring_state:
+    /* ring_state was in slot 1, not 0 so need to jump back */
+    rdma_pci_dma_unmap(pci_dev, --r->ring_state, TARGET_PAGE_SIZE);
+
+out_free_ring:
+    g_free(r);
+
+out:
+    rdma_pci_dma_unmap(pci_dev, tbl, TARGET_PAGE_SIZE);
+    rdma_pci_dma_unmap(pci_dev, dir, TARGET_PAGE_SIZE);
+
+    return rc;
+}
+
+static int create_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_cq *cmd = &req->create_cq;
+    struct pvrdma_cmd_create_cq_resp *resp = &rsp->create_cq_resp;
+    PvrdmaRing *ring = NULL;
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_CREATE_CQ_RESP;
+
+    resp->cqe = cmd->cqe;
+
+    resp->hdr.err = create_cq_ring(PCI_DEVICE(dev), &ring, cmd->pdir_dma,
+                                   cmd->nchunks, cmd->cqe);
+    if (resp->hdr.err) {
+        goto out;
+    }
+
+    pr_dbg("ring=%p\n", ring);
+
+    resp->hdr.err = rdma_rm_alloc_cq(&dev->rdma_dev_res, &dev->backend_dev,
+                                     cmd->cqe, &resp->cq_handle, ring);
+    resp->cqe = cmd->cqe;
+
+out:
+    pr_dbg("ret=%d\n", resp->hdr.err);
+    return resp->hdr.err;
+}
+
+static int destroy_cq(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_cq *cmd = &req->destroy_cq;
+    RdmaRmCQ *cq;
+    PvrdmaRing *ring;
+
+    pr_dbg("cq_handle=%d\n", cmd->cq_handle);
+
+    cq = rdma_rm_get_cq(&dev->rdma_dev_res, cmd->cq_handle);
+    if (!cq) {
+        pr_dbg("Invalid CQ handle\n");
+        return -EINVAL;
+    }
+
+    ring = (PvrdmaRing *)cq->opaque;
+    pvrdma_ring_free(ring);
+    /* ring_state was in slot 1, not 0 so need to jump back */
+    rdma_pci_dma_unmap(PCI_DEVICE(dev), --ring->ring_state, TARGET_PAGE_SIZE);
+    g_free(ring);
+
+    rdma_rm_dealloc_cq(&dev->rdma_dev_res, cmd->cq_handle);
+
+    return 0;
+}
+
+static int create_qp_rings(PCIDevice *pci_dev, uint64_t pdir_dma,
+                           PvrdmaRing **rings, uint32_t scqe, uint32_t smax_sge,
+                           uint32_t spages, uint32_t rcqe, uint32_t rmax_sge,
+                           uint32_t rpages)
+{
+    uint64_t *dir = NULL, *tbl = NULL;
+    PvrdmaRing *sr, *rr;
+    int rc = -EINVAL;
+    char ring_name[MAX_RING_NAME_SZ];
+    uint32_t wqe_sz;
+
+    pr_dbg("pdir_dma=0x%llx\n", (long long unsigned int)pdir_dma);
+    dir = rdma_pci_dma_map(pci_dev, pdir_dma, TARGET_PAGE_SIZE);
+    if (!dir) {
+        pr_dbg("Failed to map to CQ page directory\n");
+        goto out;
+    }
+
+    tbl = rdma_pci_dma_map(pci_dev, dir[0], TARGET_PAGE_SIZE);
+    if (!tbl) {
+        pr_dbg("Failed to map to CQ page table\n");
+        goto out;
+    }
+
+    sr = g_malloc(2 * sizeof(*rr));
+    rr = &sr[1];
+    pr_dbg("sring=%p\n", sr);
+    pr_dbg("rring=%p\n", rr);
+
+    *rings = sr;
+
+    pr_dbg("scqe=%d\n", scqe);
+    pr_dbg("smax_sge=%d\n", smax_sge);
+    pr_dbg("spages=%d\n", spages);
+    pr_dbg("rcqe=%d\n", rcqe);
+    pr_dbg("rmax_sge=%d\n", rmax_sge);
+    pr_dbg("rpages=%d\n", rpages);
+
+    /* Create send ring */
+    sr->ring_state = (struct pvrdma_ring *)
+        rdma_pci_dma_map(pci_dev, tbl[0], TARGET_PAGE_SIZE);
+    if (!sr->ring_state) {
+        pr_dbg("Failed to map to CQ ring state\n");
+        goto out_free_sr_mem;
+    }
+
+    wqe_sz = pow2ceil(sizeof(struct pvrdma_sq_wqe_hdr) +
+                      sizeof(struct pvrdma_sge) * smax_sge - 1);
+
+    sprintf(ring_name, "qp_sring_%lx", pdir_dma);
+    rc = pvrdma_ring_init(sr, ring_name, pci_dev, sr->ring_state,
+                          scqe, wqe_sz, (dma_addr_t *)&tbl[1], spages);
+    if (rc) {
+        goto out_unmap_ring_state;
+    }
+
+    /* Create recv ring */
+    rr->ring_state = &sr->ring_state[1];
+    wqe_sz = pow2ceil(sizeof(struct pvrdma_rq_wqe_hdr) +
+                      sizeof(struct pvrdma_sge) * rmax_sge - 1);
+    sprintf(ring_name, "qp_rring_%lx", pdir_dma);
+    rc = pvrdma_ring_init(rr, ring_name, pci_dev, rr->ring_state,
+                          rcqe, wqe_sz, (dma_addr_t *)&tbl[1 + spages], rpages);
+    if (rc) {
+        goto out_free_sr;
+    }
+
+    goto out;
+
+out_free_sr:
+    pvrdma_ring_free(sr);
+
+out_unmap_ring_state:
+    rdma_pci_dma_unmap(pci_dev, sr->ring_state, TARGET_PAGE_SIZE);
+
+out_free_sr_mem:
+    g_free(sr);
+
+out:
+    rdma_pci_dma_unmap(pci_dev, tbl, TARGET_PAGE_SIZE);
+    rdma_pci_dma_unmap(pci_dev, dir, TARGET_PAGE_SIZE);
+
+    return rc;
+}
+
+static int create_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_qp *cmd = &req->create_qp;
+    struct pvrdma_cmd_create_qp_resp *resp = &rsp->create_qp_resp;
+    PvrdmaRing *rings = NULL;
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_CREATE_QP_RESP;
+
+    pr_dbg("total_chunks=%d\n", cmd->total_chunks);
+    pr_dbg("send_chunks=%d\n", cmd->send_chunks);
+
+    resp->hdr.err = create_qp_rings(PCI_DEVICE(dev), cmd->pdir_dma, &rings,
+                                    cmd->max_send_wr, cmd->max_send_sge,
+                                    cmd->send_chunks, cmd->max_recv_wr,
+                                    cmd->max_recv_sge, cmd->total_chunks -
+                                    cmd->send_chunks - 1);
+    if (resp->hdr.err) {
+        goto out;
+    }
+
+    pr_dbg("rings=%p\n", rings);
+
+    resp->hdr.err = rdma_rm_alloc_qp(&dev->rdma_dev_res, cmd->pd_handle,
+                                     cmd->qp_type, cmd->max_send_wr,
+                                     cmd->max_send_sge, cmd->send_cq_handle,
+                                     cmd->max_recv_wr, cmd->max_recv_sge,
+                                     cmd->recv_cq_handle, rings, &resp->qpn);
+
+    resp->max_send_wr = cmd->max_send_wr;
+    resp->max_recv_wr = cmd->max_recv_wr;
+    resp->max_send_sge = cmd->max_send_sge;
+    resp->max_recv_sge = cmd->max_recv_sge;
+    resp->max_inline_data = cmd->max_inline_data;
+
+out:
+    pr_dbg("ret=%d\n", resp->hdr.err);
+    return resp->hdr.err;
+}
+
+static int modify_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_modify_qp *cmd = &req->modify_qp;
+
+    pr_dbg("qp_handle=%d\n", cmd->qp_handle);
+
+    memset(rsp, 0, sizeof(*rsp));
+    rsp->hdr.response = cmd->hdr.response;
+    rsp->hdr.ack = PVRDMA_CMD_MODIFY_QP_RESP;
+
+    rsp->hdr.err = rdma_rm_modify_qp(&dev->rdma_dev_res, &dev->backend_dev,
+                                 cmd->qp_handle, cmd->attr_mask,
+                                 (union ibv_gid *)&cmd->attrs.ah_attr.grh.dgid,
+                                 cmd->attrs.dest_qp_num, cmd->attrs.qp_state,
+                                 cmd->attrs.qkey, cmd->attrs.rq_psn,
+                                 cmd->attrs.sq_psn);
+
+    pr_dbg("ret=%d\n", rsp->hdr.err);
+    return rsp->hdr.err;
+}
+
+static int destroy_qp(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_qp *cmd = &req->destroy_qp;
+    RdmaRmQP *qp;
+    PvrdmaRing *ring;
+
+    qp = rdma_rm_get_qp(&dev->rdma_dev_res, cmd->qp_handle);
+    if (!qp) {
+        pr_dbg("Invalid QP handle\n");
+        return -EINVAL;
+    }
+
+    rdma_rm_dealloc_qp(&dev->rdma_dev_res, cmd->qp_handle);
+
+    ring = (PvrdmaRing *)qp->opaque;
+    pr_dbg("sring=%p\n", &ring[0]);
+    pvrdma_ring_free(&ring[0]);
+    pr_dbg("rring=%p\n", &ring[1]);
+    pvrdma_ring_free(&ring[1]);
+
+    rdma_pci_dma_unmap(PCI_DEVICE(dev), ring->ring_state, TARGET_PAGE_SIZE);
+    g_free(ring);
+
+    return 0;
+}
+
+static int create_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                       union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_bind *cmd = &req->create_bind;
+#ifdef PVRDMA_DEBUG
+    __be64 *subnet = (__be64 *)&cmd->new_gid[0];
+    __be64 *if_id = (__be64 *)&cmd->new_gid[8];
+#endif
+
+    pr_dbg("index=%d\n", cmd->index);
+
+    if (cmd->index > MAX_PORT_GIDS) {
+        return -EINVAL;
+    }
+
+    pr_dbg("gid[%d]=0x%llx,0x%llx\n", cmd->index,
+           (long long unsigned int)be64_to_cpu(*subnet),
+           (long long unsigned int)be64_to_cpu(*if_id));
+
+    /* Driver forces to one port only */
+    memcpy(dev->rdma_dev_res.ports[0].gid_tbl[cmd->index].raw, &cmd->new_gid,
+           sizeof(cmd->new_gid));
+
+    /* TODO: Since drivers stores node_guid at load_dsr phase then this
+     * assignment is not relevant, i need to figure out a way how to
+     * retrieve MAC of our netdev */
+    dev->node_guid = dev->rdma_dev_res.ports[0].gid_tbl[0].global.interface_id;
+    pr_dbg("dev->node_guid=0x%llx\n",
+           (long long unsigned int)be64_to_cpu(dev->node_guid));
+
+    return 0;
+}
+
+static int destroy_bind(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                        union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_bind *cmd = &req->destroy_bind;
+
+    pr_dbg("clear index %d\n", cmd->index);
+
+    memset(dev->rdma_dev_res.ports[0].gid_tbl[cmd->index].raw, 0,
+           sizeof(dev->rdma_dev_res.ports[0].gid_tbl[cmd->index].raw));
+
+    return 0;
+}
+
+static int create_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                     union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_create_uc *cmd = &req->create_uc;
+    struct pvrdma_cmd_create_uc_resp *resp = &rsp->create_uc_resp;
+
+    pr_dbg("pfn=%d\n", cmd->pfn);
+
+    memset(resp, 0, sizeof(*resp));
+    resp->hdr.response = cmd->hdr.response;
+    resp->hdr.ack = PVRDMA_CMD_CREATE_UC_RESP;
+    resp->hdr.err = rdma_rm_alloc_uc(&dev->rdma_dev_res, cmd->pfn,
+                                     &resp->ctx_handle);
+
+    pr_dbg("ret=%d\n", resp->hdr.err);
+
+    return 0;
+}
+
+static int destroy_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
+                      union pvrdma_cmd_resp *rsp)
+{
+    struct pvrdma_cmd_destroy_uc *cmd = &req->destroy_uc;
+
+    pr_dbg("ctx_handle=%d\n", cmd->ctx_handle);
+
+    rdma_rm_dealloc_uc(&dev->rdma_dev_res, cmd->ctx_handle);
+
+    return 0;
+}
+struct cmd_handler {
+    uint32_t cmd;
+    int (*exec)(PVRDMADev *dev, union pvrdma_cmd_req *req,
+            union pvrdma_cmd_resp *rsp);
+};
+
+static struct cmd_handler cmd_handlers[] = {
+    {PVRDMA_CMD_QUERY_PORT, query_port},
+    {PVRDMA_CMD_QUERY_PKEY, query_pkey},
+    {PVRDMA_CMD_CREATE_PD, create_pd},
+    {PVRDMA_CMD_DESTROY_PD, destroy_pd},
+    {PVRDMA_CMD_CREATE_MR, create_mr},
+    {PVRDMA_CMD_DESTROY_MR, destroy_mr},
+    {PVRDMA_CMD_CREATE_CQ, create_cq},
+    {PVRDMA_CMD_RESIZE_CQ, NULL},
+    {PVRDMA_CMD_DESTROY_CQ, destroy_cq},
+    {PVRDMA_CMD_CREATE_QP, create_qp},
+    {PVRDMA_CMD_MODIFY_QP, modify_qp},
+    {PVRDMA_CMD_QUERY_QP, NULL},
+    {PVRDMA_CMD_DESTROY_QP, destroy_qp},
+    {PVRDMA_CMD_CREATE_UC, create_uc},
+    {PVRDMA_CMD_DESTROY_UC, destroy_uc},
+    {PVRDMA_CMD_CREATE_BIND, create_bind},
+    {PVRDMA_CMD_DESTROY_BIND, destroy_bind},
+};
+
+int execute_command(PVRDMADev *dev)
+{
+    int err = 0xFFFF;
+    DSRInfo *dsr_info;
+
+    dsr_info = &dev->dsr_info;
+
+    pr_dbg("cmd=%d\n", dsr_info->req->hdr.cmd);
+    if (dsr_info->req->hdr.cmd >= sizeof(cmd_handlers) /
+                      sizeof(struct cmd_handler)) {
+        pr_dbg("Unsupported command\n");
+        goto out;
+    }
+
+    if (!cmd_handlers[dsr_info->req->hdr.cmd].exec) {
+        pr_dbg("Unsupported command (not implemented yet)\n");
+        goto out;
+    }
+
+    err = cmd_handlers[dsr_info->req->hdr.cmd].exec(dev, dsr_info->req,
+                            dsr_info->rsp);
+out:
+    set_reg_val(dev, PVRDMA_REG_ERR, err);
+    post_interrupt(dev, INTR_VEC_CMD_RING);
+
+    return (err == 0) ? 0 : -EINVAL;
+}
diff --git a/hw/rdma/vmw/pvrdma_dev_ring.c b/hw/rdma/vmw/pvrdma_dev_ring.c
new file mode 100644
index 0000000..ec309da
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma_dev_ring.c
@@ -0,0 +1,155 @@
+/*
+ * QEMU paravirtual RDMA - Device rings
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <qemu/osdep.h>
+#include <hw/pci/pci.h>
+#include <cpu.h>
+
+#include "../rdma_utils.h"
+#include <standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h>
+#include "pvrdma_dev_ring.h"
+
+int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
+                     struct pvrdma_ring *ring_state, uint32_t max_elems,
+                     size_t elem_sz, dma_addr_t *tbl, dma_addr_t npages)
+{
+    int i;
+    int rc = 0;
+
+    strncpy(ring->name, name, MAX_RING_NAME_SZ);
+    ring->name[MAX_RING_NAME_SZ - 1] = 0;
+    pr_dbg("Initializing %s ring\n", ring->name);
+    ring->dev = dev;
+    ring->ring_state = ring_state;
+    ring->max_elems = max_elems;
+    ring->elem_sz = elem_sz;
+    pr_dbg("ring->elem_sz=%ld\n", ring->elem_sz);
+    pr_dbg("npages=%ld\n", npages);
+    /* TODO: Give a moment to think if we want to redo driver settings
+    atomic_set(&ring->ring_state->prod_tail, 0);
+    atomic_set(&ring->ring_state->cons_head, 0);
+    */
+    ring->npages = npages;
+    ring->pages = g_malloc(npages * sizeof(void *));
+
+    for (i = 0; i < npages; i++) {
+        if (!tbl[i]) {
+            pr_err("npages=%ld but tbl[%d] is NULL\n", (long)npages, i);
+            continue;
+        }
+
+        ring->pages[i] = rdma_pci_dma_map(dev, tbl[i], TARGET_PAGE_SIZE);
+        if (!ring->pages[i]) {
+            rc = -ENOMEM;
+            pr_dbg("Failed to map to page %d\n", i);
+            goto out_free;
+        }
+        memset(ring->pages[i], 0, TARGET_PAGE_SIZE);
+    }
+
+    goto out;
+
+out_free:
+    while (i--) {
+        rdma_pci_dma_unmap(dev, ring->pages[i], TARGET_PAGE_SIZE);
+    }
+    g_free(ring->pages);
+
+out:
+    return rc;
+}
+
+void *pvrdma_ring_next_elem_read(PvrdmaRing *ring)
+{
+    unsigned int idx = 0, offset;
+
+    /*
+    pr_dbg("%s: t=%d, h=%d\n", ring->name, ring->ring_state->prod_tail,
+           ring->ring_state->cons_head);
+    */
+
+    if (!pvrdma_idx_ring_has_data(ring->ring_state, ring->max_elems, &idx)) {
+        pr_dbg("No more data in ring\n");
+        return NULL;
+    }
+
+    offset = idx * ring->elem_sz;
+    /*
+    pr_dbg("idx=%d\n", idx);
+    pr_dbg("offset=%d\n", offset);
+    */
+    return ring->pages[offset / TARGET_PAGE_SIZE] + (offset % TARGET_PAGE_SIZE);
+}
+
+void pvrdma_ring_read_inc(PvrdmaRing *ring)
+{
+    pvrdma_idx_ring_inc(&ring->ring_state->cons_head, ring->max_elems);
+    /*
+    pr_dbg("%s: t=%d, h=%d, m=%ld\n", ring->name,
+           ring->ring_state->prod_tail, ring->ring_state->cons_head,
+           ring->max_elems);
+    */
+}
+
+void *pvrdma_ring_next_elem_write(PvrdmaRing *ring)
+{
+    unsigned int idx, offset, tail;
+
+    /*
+    pr_dbg("%s: t=%d, h=%d\n", ring->name, ring->ring_state->prod_tail,
+           ring->ring_state->cons_head);
+    */
+
+    if (!pvrdma_idx_ring_has_space(ring->ring_state, ring->max_elems, &tail)) {
+        pr_dbg("CQ is full\n");
+        return NULL;
+    }
+
+    idx = pvrdma_idx(&ring->ring_state->prod_tail, ring->max_elems);
+    /* TODO: tail == idx */
+
+    offset = idx * ring->elem_sz;
+    return ring->pages[offset / TARGET_PAGE_SIZE] + (offset % TARGET_PAGE_SIZE);
+}
+
+void pvrdma_ring_write_inc(PvrdmaRing *ring)
+{
+    pvrdma_idx_ring_inc(&ring->ring_state->prod_tail, ring->max_elems);
+    /*
+    pr_dbg("%s: t=%d, h=%d, m=%ld\n", ring->name,
+           ring->ring_state->prod_tail, ring->ring_state->cons_head,
+           ring->max_elems);
+    */
+}
+
+void pvrdma_ring_free(PvrdmaRing *ring)
+{
+    if (!ring) {
+        return;
+    }
+
+    if (!ring->pages) {
+        return;
+    }
+
+    pr_dbg("ring->npages=%d\n", ring->npages);
+    while (ring->npages--) {
+        rdma_pci_dma_unmap(ring->dev, ring->pages[ring->npages],
+                           TARGET_PAGE_SIZE);
+    }
+
+    g_free(ring->pages);
+    ring->pages = NULL;
+}
diff --git a/hw/rdma/vmw/pvrdma_dev_ring.h b/hw/rdma/vmw/pvrdma_dev_ring.h
new file mode 100644
index 0000000..02a590b
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma_dev_ring.h
@@ -0,0 +1,42 @@
+/*
+ * QEMU VMWARE paravirtual RDMA ring utilities
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef PVRDMA_DEV_RING_H
+#define PVRDMA_DEV_RING_H
+
+#include <qemu/typedefs.h>
+
+#define MAX_RING_NAME_SZ 32
+
+typedef struct PvrdmaRing {
+    char name[MAX_RING_NAME_SZ];
+    PCIDevice *dev;
+    uint32_t max_elems;
+    size_t elem_sz;
+    struct pvrdma_ring *ring_state; /* used only for unmap */
+    int npages;
+    void **pages;
+} PvrdmaRing;
+
+int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
+                     struct pvrdma_ring *ring_state, uint32_t max_elems,
+                     size_t elem_sz, dma_addr_t *tbl, dma_addr_t npages);
+void *pvrdma_ring_next_elem_read(PvrdmaRing *ring);
+void pvrdma_ring_read_inc(PvrdmaRing *ring);
+void *pvrdma_ring_next_elem_write(PvrdmaRing *ring);
+void pvrdma_ring_write_inc(PvrdmaRing *ring);
+void pvrdma_ring_free(PvrdmaRing *ring);
+
+#endif
diff --git a/hw/rdma/vmw/pvrdma_qp_ops.c b/hw/rdma/vmw/pvrdma_qp_ops.c
new file mode 100644
index 0000000..f0a1f9e
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma_qp_ops.c
@@ -0,0 +1,222 @@
+/*
+ * QEMU paravirtual RDMA - QP implementation
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <qemu/osdep.h>
+
+#include "../rdma_utils.h"
+#include "../rdma_rm.h"
+#include "../rdma_backend.h"
+
+#include "pvrdma.h"
+#include <standard-headers/rdma/vmw_pvrdma-abi.h>
+#include "pvrdma_qp_ops.h"
+
+typedef struct CompHandlerCtx {
+    PVRDMADev *dev;
+    uint32_t cq_handle;
+    struct pvrdma_cqe cqe;
+} CompHandlerCtx;
+
+/* Send Queue WQE */
+typedef struct PvrdmaSqWqe {
+    struct pvrdma_sq_wqe_hdr hdr;
+    struct pvrdma_sge sge[0];
+} PvrdmaSqWqe;
+
+/* Recv Queue WQE */
+typedef struct PvrdmaRqWqe {
+    struct pvrdma_rq_wqe_hdr hdr;
+    struct pvrdma_sge sge[0];
+} PvrdmaRqWqe;
+
+/*
+ * 1. Put CQE on send CQ ring
+ * 2. Put CQ number on dsr completion ring
+ * 3. Interrupt host
+ */
+static int pvrdma_post_cqe(PVRDMADev *dev, uint32_t cq_handle,
+                           struct pvrdma_cqe *cqe)
+{
+    struct pvrdma_cqe *cqe1;
+    struct pvrdma_cqne *cqne;
+    PvrdmaRing *ring;
+    RdmaRmCQ *cq = rdma_rm_get_cq(&dev->rdma_dev_res, cq_handle);
+
+    if (unlikely(!cq)) {
+        pr_dbg("Invalid cqn %d\n", cq_handle);
+        return -EINVAL;
+    }
+
+    ring = (PvrdmaRing *)cq->opaque;
+    pr_dbg("ring=%p\n", ring);
+
+    /* Step #1: Put CQE on CQ ring */
+    pr_dbg("Writing CQE\n");
+    cqe1 = pvrdma_ring_next_elem_write(ring);
+    if (unlikely(!cqe1)) {
+        return -EINVAL;
+    }
+
+    cqe1->wr_id = cqe->wr_id;
+    cqe1->qp = cqe->qp;
+    cqe1->opcode = cqe->opcode;
+    cqe1->status = cqe->status;
+    cqe1->vendor_err = cqe->vendor_err;
+
+    pvrdma_ring_write_inc(ring);
+
+    /* Step #2: Put CQ number on dsr completion ring */
+    pr_dbg("Writing CQNE\n");
+    cqne = pvrdma_ring_next_elem_write(&dev->dsr_info.cq);
+    if (unlikely(!cqne)) {
+        return -EINVAL;
+    }
+
+    cqne->info = cq_handle;
+    pvrdma_ring_write_inc(&dev->dsr_info.cq);
+
+    pr_dbg("cq->notify=%d\n", cq->notify);
+    if (cq->notify) {
+        cq->notify = false;
+        post_interrupt(dev, INTR_VEC_CMD_COMPLETION_Q);
+    }
+
+    return 0;
+}
+
+static void pvrdma_qp_ops_comp_handler(int status, unsigned int vendor_err,
+                                       void *ctx)
+{
+    CompHandlerCtx *comp_ctx = (CompHandlerCtx *)ctx;
+
+    pr_dbg("cq_handle=%d\n", comp_ctx->cq_handle);
+    pr_dbg("wr_id=%ld\n", comp_ctx->cqe.wr_id);
+    pr_dbg("status=%d\n", status);
+    pr_dbg("vendor_err=0x%x\n", vendor_err);
+    comp_ctx->cqe.status = status;
+    comp_ctx->cqe.vendor_err = vendor_err;
+    pvrdma_post_cqe(comp_ctx->dev, comp_ctx->cq_handle, &comp_ctx->cqe);
+    g_free(ctx);
+}
+
+void pvrdma_qp_ops_fini(void)
+{
+    rdma_backend_unregister_comp_handler();
+}
+
+int pvrdma_qp_ops_init(void)
+{
+    rdma_backend_register_comp_handler(pvrdma_qp_ops_comp_handler);
+
+    return 0;
+}
+
+int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle)
+{
+    RdmaRmQP *qp;
+    PvrdmaSqWqe *wqe;
+    PvrdmaRing *ring;
+
+    pr_dbg("qp_handle=%d\n", qp_handle);
+
+    qp = rdma_rm_get_qp(&dev->rdma_dev_res, qp_handle);
+    if (unlikely(!qp)) {
+        return -EINVAL;
+    }
+
+    ring = (PvrdmaRing *)qp->opaque;
+    pr_dbg("sring=%p\n", ring);
+
+    wqe = (struct PvrdmaSqWqe *)pvrdma_ring_next_elem_read(ring);
+    while (wqe) {
+        CompHandlerCtx *comp_ctx;
+
+        pr_dbg("wr_id=%ld\n", wqe->hdr.wr_id);
+
+        /* Prepare CQE */
+        comp_ctx = g_malloc(sizeof(CompHandlerCtx));
+        comp_ctx->dev = dev;
+        comp_ctx->cq_handle = qp->send_cq_handle;
+        comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
+        comp_ctx->cqe.qp = qp_handle;
+        comp_ctx->cqe.opcode = wqe->hdr.opcode;
+
+        rdma_backend_post_send(&dev->backend_dev, &qp->backend_qp, qp->qp_type,
+                               (struct ibv_sge *)&wqe->sge[0], wqe->hdr.num_sge,
+                               (union ibv_gid *)wqe->hdr.wr.ud.av.dgid,
+                               wqe->hdr.wr.ud.remote_qpn,
+                               wqe->hdr.wr.ud.remote_qkey, comp_ctx);
+
+        pvrdma_ring_read_inc(ring);
+
+        wqe = pvrdma_ring_next_elem_read(ring);
+    }
+
+    return 0;
+}
+
+int pvrdma_qp_recv(PVRDMADev *dev, uint32_t qp_handle)
+{
+    RdmaRmQP *qp;
+    PvrdmaRqWqe *wqe;
+    PvrdmaRing *ring;
+
+    pr_dbg("qp_handle=%d\n", qp_handle);
+
+    qp = rdma_rm_get_qp(&dev->rdma_dev_res, qp_handle);
+    if (unlikely(!qp)) {
+        return -EINVAL;
+    }
+
+    ring = &((PvrdmaRing *)qp->opaque)[1];
+    pr_dbg("rring=%p\n", ring);
+
+    wqe = (struct PvrdmaRqWqe *)pvrdma_ring_next_elem_read(ring);
+    while (wqe) {
+        CompHandlerCtx *comp_ctx;
+
+        pr_dbg("wr_id=%ld\n", wqe->hdr.wr_id);
+
+        /* Prepare CQE */
+        comp_ctx = g_malloc(sizeof(CompHandlerCtx));
+        comp_ctx->dev = dev;
+        comp_ctx->cq_handle = qp->recv_cq_handle;
+        comp_ctx->cqe.qp = qp_handle;
+        comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
+
+        rdma_backend_post_recv(&dev->backend_dev, &dev->rdma_dev_res,
+                               &qp->backend_qp, qp->qp_type,
+                               (struct ibv_sge *)&wqe->sge[0], wqe->hdr.num_sge,
+                               comp_ctx);
+
+        pvrdma_ring_read_inc(ring);
+
+        wqe = pvrdma_ring_next_elem_read(ring);
+    }
+
+    return 0;
+}
+
+void pvrdma_cq_poll(RdmaDeviceResources *dev_res, uint32_t cq_handle)
+{
+    RdmaRmCQ *cq;
+
+    cq = rdma_rm_get_cq(dev_res, cq_handle);
+    if (!cq) {
+        pr_dbg("Invalid CQ# %d\n", cq_handle);
+    }
+
+    rdma_backend_poll_cq(dev_res, &cq->backend_cq);
+}
diff --git a/hw/rdma/vmw/pvrdma_qp_ops.h b/hw/rdma/vmw/pvrdma_qp_ops.h
new file mode 100644
index 0000000..ac46bf7
--- /dev/null
+++ b/hw/rdma/vmw/pvrdma_qp_ops.h
@@ -0,0 +1,27 @@
+/*
+ * QEMU VMWARE paravirtual RDMA QP Operations
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef PVRDMA_QP_H
+#define PVRDMA_QP_H
+
+#include "pvrdma.h"
+
+int pvrdma_qp_ops_init(void);
+void pvrdma_qp_ops_fini(void);
+int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle);
+int pvrdma_qp_recv(PVRDMADev *dev, uint32_t qp_handle);
+void pvrdma_cq_poll(RdmaDeviceResources *dev_res, uint32_t cq_handle);
+
+#endif