/* This file is part of the Emulex RoCE Device Driver for
 * RoCE (RDMA over Converged Ethernet) adapters.
 * Copyright (C) 2012-2015 Emulex. All rights reserved.
 * EMULEX and SLI are trademarks of Emulex.
 * www.emulex.com
 *
 * This software is available to you under a choice of one of two licenses.
 * You may choose to be licensed under the terms of the GNU General Public
 * License (GPL) Version 2, available from the file COPYING in the main
 * directory of this source tree, or the BSD license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Contact Information:
 * linux-drivers@emulex.com
 *
 * Emulex
 * 3333 Susan Street
 * Costa Mesa, CA 92626
 */

#include <linux/dma-mapping.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/iw_cm.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include <rdma/uverbs_ioctl.h>

#include "ocrdma.h"
#include "ocrdma_hw.h"
#include "ocrdma_verbs.h"
#include <rdma/ocrdma-abi.h>

int ocrdma_query_pkey(struct ib_device *ibdev, u8 port, u16 index, u16 *pkey)
{
        if (index > 0)
                return -EINVAL;

        *pkey = 0xffff;
        return 0;
}

int ocrdma_query_device(struct ib_device *ibdev, struct ib_device_attr *attr,
                        struct ib_udata *uhw)
{
        struct ocrdma_dev *dev = get_ocrdma_dev(ibdev);

        if (uhw->inlen || uhw->outlen)
                return -EINVAL;

        memset(attr, 0, sizeof *attr);
        memcpy(&attr->fw_ver, &dev->attr.fw_ver[0],
               min(sizeof(dev->attr.fw_ver), sizeof(attr->fw_ver)));
        ocrdma_get_guid(dev, (u8 *)&attr->sys_image_guid);
        attr->max_mr_size = dev->attr.max_mr_size;
        attr->page_size_cap = 0xffff000;
        attr->vendor_id = dev->nic_info.pdev->vendor;
        attr->vendor_part_id = dev->nic_info.pdev->device;
        attr->hw_ver = dev->asic_id;
        attr->max_qp = dev->attr.max_qp;
        attr->max_ah = OCRDMA_MAX_AH;
        attr->max_qp_wr = dev->attr.max_wqe;

        attr->device_cap_flags = IB_DEVICE_CURR_QP_STATE_MOD |
                                        IB_DEVICE_RC_RNR_NAK_GEN |
                                        IB_DEVICE_SHUTDOWN_PORT |
                                        IB_DEVICE_SYS_IMAGE_GUID |
                                        IB_DEVICE_LOCAL_DMA_LKEY |
                                        IB_DEVICE_MEM_MGT_EXTENSIONS;
        attr->max_send_sge = dev->attr.max_send_sge;
        attr->max_recv_sge = dev->attr.max_recv_sge;
        attr->max_sge_rd = dev->attr.max_rdma_sge;
        attr->max_cq = dev->attr.max_cq;
        attr->max_cqe = dev->attr.max_cqe;
        attr->max_mr = dev->attr.max_mr;
        attr->max_mw = dev->attr.max_mw;
        attr->max_pd = dev->attr.max_pd;
        attr->atomic_cap = 0;
        attr->max_fmr = 0;
        attr->max_map_per_fmr = 0;
        attr->max_qp_rd_atom =
            min(dev->attr.max_ord_per_qp, dev->attr.max_ird_per_qp);
        attr->max_qp_init_rd_atom = dev->attr.max_ord_per_qp;
        attr->max_srq = dev->attr.max_srq;
        attr->max_srq_sge = dev->attr.max_srq_sge;
        attr->max_srq_wr = dev->attr.max_rqe;
        attr->local_ca_ack_delay = dev->attr.local_ca_ack_delay;
        attr->max_fast_reg_page_list_len = dev->attr.max_pages_per_frmr;
        attr->max_pkeys = 1;
        return 0;
}

static inline void get_link_speed_and_width(struct ocrdma_dev *dev,
                                            u8 *ib_speed, u8 *ib_width)
{
        int status;
        u8 speed;

        status = ocrdma_mbx_get_link_speed(dev, &speed, NULL);
        if (status)
                speed = OCRDMA_PHYS_LINK_SPEED_ZERO;

        switch (speed) {
        case OCRDMA_PHYS_LINK_SPEED_1GBPS:
                *ib_speed = IB_SPEED_SDR;
                *ib_width = IB_WIDTH_1X;
                break;

        case OCRDMA_PHYS_LINK_SPEED_10GBPS:
                *ib_speed = IB_SPEED_QDR;
                *ib_width = IB_WIDTH_1X;
                break;

        case OCRDMA_PHYS_LINK_SPEED_20GBPS:
                *ib_speed = IB_SPEED_DDR;
                *ib_width = IB_WIDTH_4X;
                break;

        case OCRDMA_PHYS_LINK_SPEED_40GBPS:
                *ib_speed = IB_SPEED_QDR;
                *ib_width = IB_WIDTH_4X;
                break;

        default:
                /* Unsupported */
                *ib_speed = IB_SPEED_SDR;
                *ib_width = IB_WIDTH_1X;
        }
}

int ocrdma_query_port(struct ib_device *ibdev,
                      u8 port, struct ib_port_attr *props)
{
        enum ib_port_state port_state;
        struct ocrdma_dev *dev;
        struct net_device *netdev;

        /* props being zeroed by the caller, avoid zeroing it here */
        dev = get_ocrdma_dev(ibdev);
        netdev = dev->nic_info.netdev;
        if (netif_running(netdev) && netif_oper_up(netdev)) {
                port_state = IB_PORT_ACTIVE;
                props->phys_state = 5;
        } else {
                port_state = IB_PORT_DOWN;
                props->phys_state = 3;
        }
        props->max_mtu = IB_MTU_4096;
        props->active_mtu = iboe_get_mtu(netdev->mtu);
        props->lid = 0;
        props->lmc = 0;
        props->sm_lid = 0;
        props->sm_sl = 0;
        props->state = port_state;
        props->port_cap_flags = IB_PORT_CM_SUP | IB_PORT_REINIT_SUP |
                                IB_PORT_DEVICE_MGMT_SUP |
                                IB_PORT_VENDOR_CLASS_SUP;
        props->ip_gids = true;
        props->gid_tbl_len = OCRDMA_MAX_SGID;
        props->pkey_tbl_len = 1;
        props->bad_pkey_cntr = 0;
        props->qkey_viol_cntr = 0;
        get_link_speed_and_width(dev, &props->active_speed,
                                 &props->active_width);
        props->max_msg_sz = 0x80000000;
        props->max_vl_num = 4;
        return 0;
}

int ocrdma_modify_port(struct ib_device *ibdev, u8 port, int mask,
                       struct ib_port_modify *props)
{
        return 0;
}

static int ocrdma_add_mmap(struct ocrdma_ucontext *uctx, u64 phy_addr,
                           unsigned long len)
{
        struct ocrdma_mm *mm;

        mm = kzalloc(sizeof(*mm), GFP_KERNEL);
        if (mm == NULL)
                return -ENOMEM;
        mm->key.phy_addr = phy_addr;
        mm->key.len = len;
        INIT_LIST_HEAD(&mm->entry);

        mutex_lock(&uctx->mm_list_lock);
        list_add_tail(&mm->entry, &uctx->mm_head);
        mutex_unlock(&uctx->mm_list_lock);
        return 0;
}

static void ocrdma_del_mmap(struct ocrdma_ucontext *uctx, u64 phy_addr,
                            unsigned long len)
{
        struct ocrdma_mm *mm, *tmp;

        mutex_lock(&uctx->mm_list_lock);
        list_for_each_entry_safe(mm, tmp, &uctx->mm_head, entry) {
                if (len != mm->key.len && phy_addr != mm->key.phy_addr)
                        continue;

                list_del(&mm->entry);
                kfree(mm);
                break;
        }
        mutex_unlock(&uctx->mm_list_lock);
}

static bool ocrdma_search_mmap(struct ocrdma_ucontext *uctx, u64 phy_addr,
                              unsigned long len)
{
        bool found = false;
        struct ocrdma_mm *mm;

        mutex_lock(&uctx->mm_list_lock);
        list_for_each_entry(mm, &uctx->mm_head, entry) {
                if (len != mm->key.len && phy_addr != mm->key.phy_addr)
                        continue;

                found = true;
                break;
        }
        mutex_unlock(&uctx->mm_list_lock);
        return found;
}


static u16 _ocrdma_pd_mgr_get_bitmap(struct ocrdma_dev *dev, bool dpp_pool)
{
        u16 pd_bitmap_idx = 0;
        const unsigned long *pd_bitmap;

        if (dpp_pool) {
                pd_bitmap = dev->pd_mgr->pd_dpp_bitmap;
                pd_bitmap_idx = find_first_zero_bit(pd_bitmap,
                                                    dev->pd_mgr->max_dpp_pd);
                __set_bit(pd_bitmap_idx, dev->pd_mgr->pd_dpp_bitmap);
                dev->pd_mgr->pd_dpp_count++;
                if (dev->pd_mgr->pd_dpp_count > dev->pd_mgr->pd_dpp_thrsh)
                        dev->pd_mgr->pd_dpp_thrsh = dev->pd_mgr->pd_dpp_count;
        } else {
                pd_bitmap = dev->pd_mgr->pd_norm_bitmap;
                pd_bitmap_idx = find_first_zero_bit(pd_bitmap,
                                                    dev->pd_mgr->max_normal_pd);
                __set_bit(pd_bitmap_idx, dev->pd_mgr->pd_norm_bitmap);
                dev->pd_mgr->pd_norm_count++;
                if (dev->pd_mgr->pd_norm_count > dev->pd_mgr->pd_norm_thrsh)
                        dev->pd_mgr->pd_norm_thrsh = dev->pd_mgr->pd_norm_count;
        }
        return pd_bitmap_idx;
}

static int _ocrdma_pd_mgr_put_bitmap(struct ocrdma_dev *dev, u16 pd_id,
                                        bool dpp_pool)
{
        u16 pd_count;
        u16 pd_bit_index;

        pd_count = dpp_pool ? dev->pd_mgr->pd_dpp_count :
                              dev->pd_mgr->pd_norm_count;
        if (pd_count == 0)
                return -EINVAL;

        if (dpp_pool) {
                pd_bit_index = pd_id - dev->pd_mgr->pd_dpp_start;
                if (pd_bit_index >= dev->pd_mgr->max_dpp_pd) {
                        return -EINVAL;
                } else {
                        __clear_bit(pd_bit_index, dev->pd_mgr->pd_dpp_bitmap);
                        dev->pd_mgr->pd_dpp_count--;
                }
        } else {
                pd_bit_index = pd_id - dev->pd_mgr->pd_norm_start;
                if (pd_bit_index >= dev->pd_mgr->max_normal_pd) {
                        return -EINVAL;
                } else {
                        __clear_bit(pd_bit_index, dev->pd_mgr->pd_norm_bitmap);
                        dev->pd_mgr->pd_norm_count--;
                }
        }

        return 0;
}

static int ocrdma_put_pd_num(struct ocrdma_dev *dev, u16 pd_id,
                                   bool dpp_pool)
{
        int status;

        mutex_lock(&dev->dev_lock);
        status = _ocrdma_pd_mgr_put_bitmap(dev, pd_id, dpp_pool);
        mutex_unlock(&dev->dev_lock);
        return status;
}

static int ocrdma_get_pd_num(struct ocrdma_dev *dev, struct ocrdma_pd *pd)
{
        u16 pd_idx = 0;
        int status = 0;

        mutex_lock(&dev->dev_lock);
        if (pd->dpp_enabled) {
                /* try allocating DPP PD, if not available then normal PD */
                if (dev->pd_mgr->pd_dpp_count < dev->pd_mgr->max_dpp_pd) {
                        pd_idx = _ocrdma_pd_mgr_get_bitmap(dev, true);
                        pd->id = dev->pd_mgr->pd_dpp_start + pd_idx;
                        pd->dpp_page = dev->pd_mgr->dpp_page_index + pd_idx;
                } else if (dev->pd_mgr->pd_norm_count <
                           dev->pd_mgr->max_normal_pd) {
                        pd_idx = _ocrdma_pd_mgr_get_bitmap(dev, false);
                        pd->id = dev->pd_mgr->pd_norm_start + pd_idx;
                        pd->dpp_enabled = false;
                } else {
                        status = -EINVAL;
                }
        } else {
                if (dev->pd_mgr->pd_norm_count < dev->pd_mgr->max_normal_pd) {
                        pd_idx = _ocrdma_pd_mgr_get_bitmap(dev, false);
                        pd->id = dev->pd_mgr->pd_norm_start + pd_idx;
                } else {
                        status = -EINVAL;
                }
        }
        mutex_unlock(&dev->dev_lock);
        return status;
}

/*
 * NOTE:
 *
 * ocrdma_ucontext must be used here because this function is also
 * called from ocrdma_alloc_ucontext where ib_udata does not have
 * valid ib_ucontext pointer. ib_uverbs_get_context does not call
 * uobj_{alloc|get_xxx} helpers which are used to store the
 * ib_ucontext in uverbs_attr_bundle wrapping the ib_udata. so
 * ib_udata does NOT imply valid ib_ucontext here!
 */
static int _ocrdma_alloc_pd(struct ocrdma_dev *dev, struct ocrdma_pd *pd,
                            struct ocrdma_ucontext *uctx,
                            struct ib_udata *udata)
{
        int status;

        if (udata && uctx && dev->attr.max_dpp_pds) {
                pd->dpp_enabled =
                        ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R;
                pd->num_dpp_qp =
                        pd->dpp_enabled ? (dev->nic_info.db_page_size /
                                           dev->attr.wqe_size) : 0;
        }

        if (dev->pd_mgr->pd_prealloc_valid)
                return ocrdma_get_pd_num(dev, pd);

retry:
        status = ocrdma_mbx_alloc_pd(dev, pd);
        if (status) {
                if (pd->dpp_enabled) {
                        pd->dpp_enabled = false;
                        pd->num_dpp_qp = 0;
                        goto retry;
                }
                return status;
        }

        return 0;
}

static inline int is_ucontext_pd(struct ocrdma_ucontext *uctx,
                                 struct ocrdma_pd *pd)
{
        return (uctx->cntxt_pd == pd);
}

static void _ocrdma_dealloc_pd(struct ocrdma_dev *dev,
                              struct ocrdma_pd *pd)
{
        if (dev->pd_mgr->pd_prealloc_valid)
                ocrdma_put_pd_num(dev, pd->id, pd->dpp_enabled);
        else
                ocrdma_mbx_dealloc_pd(dev, pd);
}

static int ocrdma_alloc_ucontext_pd(struct ocrdma_dev *dev,
                                    struct ocrdma_ucontext *uctx,
                                    struct ib_udata *udata)
{
        struct ib_device *ibdev = &dev->ibdev;
        struct ib_pd *pd;
        int status;

        pd = rdma_zalloc_drv_obj(ibdev, ib_pd);
        if (!pd)
                return -ENOMEM;

        pd->device  = ibdev;
        uctx->cntxt_pd = get_ocrdma_pd(pd);

        status = _ocrdma_alloc_pd(dev, uctx->cntxt_pd, uctx, udata);
        if (status) {
                kfree(uctx->cntxt_pd);
                goto err;
        }

        uctx->cntxt_pd->uctx = uctx;
        uctx->cntxt_pd->ibpd.device = &dev->ibdev;
err:
        return status;
}

static void ocrdma_dealloc_ucontext_pd(struct ocrdma_ucontext *uctx)
{
        struct ocrdma_pd *pd = uctx->cntxt_pd;
        struct ocrdma_dev *dev = get_ocrdma_dev(pd->ibpd.device);

        if (uctx->pd_in_use) {
                pr_err("%s(%d) Freeing in use pdid=0x%x.\n",
                       __func__, dev->id, pd->id);
        }
        kfree(uctx->cntxt_pd);
        uctx->cntxt_pd = NULL;
        _ocrdma_dealloc_pd(dev, pd);
}

static struct ocrdma_pd *ocrdma_get_ucontext_pd(struct ocrdma_ucontext *uctx)
{
        struct ocrdma_pd *pd = NULL;

        mutex_lock(&uctx->mm_list_lock);
        if (!uctx->pd_in_use) {
                uctx->pd_in_use = true;
                pd = uctx->cntxt_pd;
        }
        mutex_unlock(&uctx->mm_list_lock);

        return pd;
}

static void ocrdma_release_ucontext_pd(struct ocrdma_ucontext *uctx)
{
        mutex_lock(&uctx->mm_list_lock);
        uctx->pd_in_use = false;
        mutex_unlock(&uctx->mm_list_lock);
}

int ocrdma_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
{
        struct ib_device *ibdev = uctx->device;
        int status;
        struct ocrdma_ucontext *ctx = get_ocrdma_ucontext(uctx);
        struct ocrdma_alloc_ucontext_resp resp = {};
        struct ocrdma_dev *dev = get_ocrdma_dev(ibdev);
        struct pci_dev *pdev = dev->nic_info.pdev;
        u32 map_len = roundup(sizeof(u32) * 2048, PAGE_SIZE);

        if (!udata)
                return -EFAULT;
        INIT_LIST_HEAD(&ctx->mm_head);
        mutex_init(&ctx->mm_list_lock);

        ctx->ah_tbl.va = dma_alloc_coherent(&pdev->dev, map_len,
                                            &ctx->ah_tbl.pa, GFP_KERNEL);
        if (!ctx->ah_tbl.va)
                return -ENOMEM;

        ctx->ah_tbl.len = map_len;

        resp.ah_tbl_len = ctx->ah_tbl.len;
        resp.ah_tbl_page = virt_to_phys(ctx->ah_tbl.va);

        status = ocrdma_add_mmap(ctx, resp.ah_tbl_page, resp.ah_tbl_len);
        if (status)
                goto map_err;

        status = ocrdma_alloc_ucontext_pd(dev, ctx, udata);
        if (status)
                goto pd_err;

        resp.dev_id = dev->id;
        resp.max_inline_data = dev->attr.max_inline_data;
        resp.wqe_size = dev->attr.wqe_size;
        resp.rqe_size = dev->attr.rqe_size;
        resp.dpp_wqe_size = dev->attr.wqe_size;

        memcpy(resp.fw_ver, dev->attr.fw_ver, sizeof(resp.fw_ver));
        status = ib_copy_to_udata(udata, &resp, sizeof(resp));
        if (status)
                goto cpy_err;
        return 0;

cpy_err:
        ocrdma_dealloc_ucontext_pd(ctx);
pd_err:
        ocrdma_del_mmap(ctx, ctx->ah_tbl.pa, ctx->ah_tbl.len);
map_err:
        dma_free_coherent(&pdev->dev, ctx->ah_tbl.len, ctx->ah_tbl.va,
                          ctx->ah_tbl.pa);
        return status;
}

void ocrdma_dealloc_ucontext(struct ib_ucontext *ibctx)
{
        struct ocrdma_mm *mm, *tmp;
        struct ocrdma_ucontext *uctx = get_ocrdma_ucontext(ibctx);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibctx->device);
        struct pci_dev *pdev = dev->nic_info.pdev;

        ocrdma_dealloc_ucontext_pd(uctx);

        ocrdma_del_mmap(uctx, uctx->ah_tbl.pa, uctx->ah_tbl.len);
        dma_free_coherent(&pdev->dev, uctx->ah_tbl.len, uctx->ah_tbl.va,
                          uctx->ah_tbl.pa);

        list_for_each_entry_safe(mm, tmp, &uctx->mm_head, entry) {
                list_del(&mm->entry);
                kfree(mm);
        }
}

int ocrdma_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
{
        struct ocrdma_ucontext *ucontext = get_ocrdma_ucontext(context);
        struct ocrdma_dev *dev = get_ocrdma_dev(context->device);
        unsigned long vm_page = vma->vm_pgoff << PAGE_SHIFT;
        u64 unmapped_db = (u64) dev->nic_info.unmapped_db;
        unsigned long len = (vma->vm_end - vma->vm_start);
        int status;
        bool found;

        if (vma->vm_start & (PAGE_SIZE - 1))
                return -EINVAL;
        found = ocrdma_search_mmap(ucontext, vma->vm_pgoff << PAGE_SHIFT, len);
        if (!found)
                return -EINVAL;

        if ((vm_page >= unmapped_db) && (vm_page <= (unmapped_db +
                dev->nic_info.db_total_size)) &&
                (len <= dev->nic_info.db_page_size)) {
                if (vma->vm_flags & VM_READ)
                        return -EPERM;

                vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
                status = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                                            len, vma->vm_page_prot);
        } else if (dev->nic_info.dpp_unmapped_len &&
                (vm_page >= (u64) dev->nic_info.dpp_unmapped_addr) &&
                (vm_page <= (u64) (dev->nic_info.dpp_unmapped_addr +
                        dev->nic_info.dpp_unmapped_len)) &&
                (len <= dev->nic_info.dpp_unmapped_len)) {
                if (vma->vm_flags & VM_READ)
                        return -EPERM;

                vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
                status = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                                            len, vma->vm_page_prot);
        } else {
                status = remap_pfn_range(vma, vma->vm_start,
                                         vma->vm_pgoff, len, vma->vm_page_prot);
        }
        return status;
}

static int ocrdma_copy_pd_uresp(struct ocrdma_dev *dev, struct ocrdma_pd *pd,
                                struct ib_udata *udata)
{
        int status;
        u64 db_page_addr;
        u64 dpp_page_addr = 0;
        u32 db_page_size;
        struct ocrdma_alloc_pd_uresp rsp;
        struct ocrdma_ucontext *uctx = rdma_udata_to_drv_context(
                udata, struct ocrdma_ucontext, ibucontext);

        memset(&rsp, 0, sizeof(rsp));
        rsp.id = pd->id;
        rsp.dpp_enabled = pd->dpp_enabled;
        db_page_addr = ocrdma_get_db_addr(dev, pd->id);
        db_page_size = dev->nic_info.db_page_size;

        status = ocrdma_add_mmap(uctx, db_page_addr, db_page_size);
        if (status)
                return status;

        if (pd->dpp_enabled) {
                dpp_page_addr = dev->nic_info.dpp_unmapped_addr +
                                (pd->id * PAGE_SIZE);
                status = ocrdma_add_mmap(uctx, dpp_page_addr,
                                 PAGE_SIZE);
                if (status)
                        goto dpp_map_err;
                rsp.dpp_page_addr_hi = upper_32_bits(dpp_page_addr);
                rsp.dpp_page_addr_lo = dpp_page_addr;
        }

        status = ib_copy_to_udata(udata, &rsp, sizeof(rsp));
        if (status)
                goto ucopy_err;

        pd->uctx = uctx;
        return 0;

ucopy_err:
        if (pd->dpp_enabled)
                ocrdma_del_mmap(pd->uctx, dpp_page_addr, PAGE_SIZE);
dpp_map_err:
        ocrdma_del_mmap(pd->uctx, db_page_addr, db_page_size);
        return status;
}

int ocrdma_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
{
        struct ib_device *ibdev = ibpd->device;
        struct ocrdma_dev *dev = get_ocrdma_dev(ibdev);
        struct ocrdma_pd *pd;
        int status;
        u8 is_uctx_pd = false;
        struct ocrdma_ucontext *uctx = rdma_udata_to_drv_context(
                udata, struct ocrdma_ucontext, ibucontext);

        if (udata) {
                pd = ocrdma_get_ucontext_pd(uctx);
                if (pd) {
                        is_uctx_pd = true;
                        goto pd_mapping;
                }
        }

        pd = get_ocrdma_pd(ibpd);
        status = _ocrdma_alloc_pd(dev, pd, uctx, udata);
        if (status)
                goto exit;

pd_mapping:
        if (udata) {
                status = ocrdma_copy_pd_uresp(dev, pd, udata);
                if (status)
                        goto err;
        }
        return 0;

err:
        if (is_uctx_pd)
                ocrdma_release_ucontext_pd(uctx);
        else
                _ocrdma_dealloc_pd(dev, pd);
exit:
        return status;
}

void ocrdma_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
{
        struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
        struct ocrdma_ucontext *uctx = NULL;
        u64 usr_db;

        uctx = pd->uctx;
        if (uctx) {
                u64 dpp_db = dev->nic_info.dpp_unmapped_addr +
                        (pd->id * PAGE_SIZE);
                if (pd->dpp_enabled)
                        ocrdma_del_mmap(pd->uctx, dpp_db, PAGE_SIZE);
                usr_db = ocrdma_get_db_addr(dev, pd->id);
                ocrdma_del_mmap(pd->uctx, usr_db, dev->nic_info.db_page_size);

                if (is_ucontext_pd(uctx, pd)) {
                        ocrdma_release_ucontext_pd(uctx);
                        return;
                }
        }
        _ocrdma_dealloc_pd(dev, pd);
}

static int ocrdma_alloc_lkey(struct ocrdma_dev *dev, struct ocrdma_mr *mr,
                            u32 pdid, int acc, u32 num_pbls, u32 addr_check)
{
        int status;

        mr->hwmr.fr_mr = 0;
        mr->hwmr.local_rd = 1;
        mr->hwmr.remote_rd = (acc & IB_ACCESS_REMOTE_READ) ? 1 : 0;
        mr->hwmr.remote_wr = (acc & IB_ACCESS_REMOTE_WRITE) ? 1 : 0;
        mr->hwmr.local_wr = (acc & IB_ACCESS_LOCAL_WRITE) ? 1 : 0;
        mr->hwmr.mw_bind = (acc & IB_ACCESS_MW_BIND) ? 1 : 0;
        mr->hwmr.remote_atomic = (acc & IB_ACCESS_REMOTE_ATOMIC) ? 1 : 0;
        mr->hwmr.num_pbls = num_pbls;

        status = ocrdma_mbx_alloc_lkey(dev, &mr->hwmr, pdid, addr_check);
        if (status)
                return status;

        mr->ibmr.lkey = mr->hwmr.lkey;
        if (mr->hwmr.remote_wr || mr->hwmr.remote_rd)
                mr->ibmr.rkey = mr->hwmr.lkey;
        return 0;
}

struct ib_mr *ocrdma_get_dma_mr(struct ib_pd *ibpd, int acc)
{
        int status;
        struct ocrdma_mr *mr;
        struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);

        if (acc & IB_ACCESS_REMOTE_WRITE && !(acc & IB_ACCESS_LOCAL_WRITE)) {
                pr_err("%s err, invalid access rights\n", __func__);
                return ERR_PTR(-EINVAL);
        }

        mr = kzalloc(sizeof(*mr), GFP_KERNEL);
        if (!mr)
                return ERR_PTR(-ENOMEM);

        status = ocrdma_alloc_lkey(dev, mr, pd->id, acc, 0,
                                   OCRDMA_ADDR_CHECK_DISABLE);
        if (status) {
                kfree(mr);
                return ERR_PTR(status);
        }

        return &mr->ibmr;
}

static void ocrdma_free_mr_pbl_tbl(struct ocrdma_dev *dev,
                                   struct ocrdma_hw_mr *mr)
{
        struct pci_dev *pdev = dev->nic_info.pdev;
        int i = 0;

        if (mr->pbl_table) {
                for (i = 0; i < mr->num_pbls; i++) {
                        if (!mr->pbl_table[i].va)
                                continue;
                        dma_free_coherent(&pdev->dev, mr->pbl_size,
                                          mr->pbl_table[i].va,
                                          mr->pbl_table[i].pa);
                }
                kfree(mr->pbl_table);
                mr->pbl_table = NULL;
        }
}

static int ocrdma_get_pbl_info(struct ocrdma_dev *dev, struct ocrdma_mr *mr,
                              u32 num_pbes)
{
        u32 num_pbls = 0;
        u32 idx = 0;
        int status = 0;
        u32 pbl_size;

        do {
                pbl_size = OCRDMA_MIN_HPAGE_SIZE * (1 << idx);
                if (pbl_size > MAX_OCRDMA_PBL_SIZE) {
                        status = -EFAULT;
                        break;
                }
                num_pbls = roundup(num_pbes, (pbl_size / sizeof(u64)));
                num_pbls = num_pbls / (pbl_size / sizeof(u64));
                idx++;
        } while (num_pbls >= dev->attr.max_num_mr_pbl);

        mr->hwmr.num_pbes = num_pbes;
        mr->hwmr.num_pbls = num_pbls;
        mr->hwmr.pbl_size = pbl_size;
        return status;
}

static int ocrdma_build_pbl_tbl(struct ocrdma_dev *dev, struct ocrdma_hw_mr *mr)
{
        int status = 0;
        int i;
        u32 dma_len = mr->pbl_size;
        struct pci_dev *pdev = dev->nic_info.pdev;
        void *va;
        dma_addr_t pa;

        mr->pbl_table = kcalloc(mr->num_pbls, sizeof(struct ocrdma_pbl),
                                GFP_KERNEL);

        if (!mr->pbl_table)
                return -ENOMEM;

        for (i = 0; i < mr->num_pbls; i++) {
                va = dma_alloc_coherent(&pdev->dev, dma_len, &pa, GFP_KERNEL);
                if (!va) {
                        ocrdma_free_mr_pbl_tbl(dev, mr);
                        status = -ENOMEM;
                        break;
                }
                mr->pbl_table[i].va = va;
                mr->pbl_table[i].pa = pa;
        }
        return status;
}

static void build_user_pbes(struct ocrdma_dev *dev, struct ocrdma_mr *mr,
                            u32 num_pbes)
{
        struct ocrdma_pbe *pbe;
        struct sg_dma_page_iter sg_iter;
        struct ocrdma_pbl *pbl_tbl = mr->hwmr.pbl_table;
        struct ib_umem *umem = mr->umem;
        int pbe_cnt, total_num_pbes = 0;
        u64 pg_addr;

        if (!mr->hwmr.num_pbes)
                return;

        pbe = (struct ocrdma_pbe *)pbl_tbl->va;
        pbe_cnt = 0;

        for_each_sg_dma_page (umem->sg_head.sgl, &sg_iter, umem->nmap, 0) {
                /* store the page address in pbe */
                pg_addr = sg_page_iter_dma_address(&sg_iter);
                pbe->pa_lo = cpu_to_le32(pg_addr);
                pbe->pa_hi = cpu_to_le32(upper_32_bits(pg_addr));
                pbe_cnt += 1;
                total_num_pbes += 1;
                pbe++;

                /* if done building pbes, issue the mbx cmd. */
                if (total_num_pbes == num_pbes)
                        return;

                /* if the given pbl is full storing the pbes,
                 * move to next pbl.
                 */
                if (pbe_cnt == (mr->hwmr.pbl_size / sizeof(u64))) {
                        pbl_tbl++;
                        pbe = (struct ocrdma_pbe *)pbl_tbl->va;
                        pbe_cnt = 0;
                }
        }
}

struct ib_mr *ocrdma_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
                                 u64 usr_addr, int acc, struct ib_udata *udata)
{
        int status = -ENOMEM;
        struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
        struct ocrdma_mr *mr;
        struct ocrdma_pd *pd;
        u32 num_pbes;

        pd = get_ocrdma_pd(ibpd);

        if (acc & IB_ACCESS_REMOTE_WRITE && !(acc & IB_ACCESS_LOCAL_WRITE))
                return ERR_PTR(-EINVAL);

        mr = kzalloc(sizeof(*mr), GFP_KERNEL);
        if (!mr)
                return ERR_PTR(status);
        mr->umem = ib_umem_get(udata, start, len, acc, 0);
        if (IS_ERR(mr->umem)) {
                status = -EFAULT;
                goto umem_err;
        }
        num_pbes = ib_umem_page_count(mr->umem);
        status = ocrdma_get_pbl_info(dev, mr, num_pbes);
        if (status)
                goto umem_err;

        mr->hwmr.pbe_size = PAGE_SIZE;
        mr->hwmr.fbo = ib_umem_offset(mr->umem);
        mr->hwmr.va = usr_addr;
        mr->hwmr.len = len;
        mr->hwmr.remote_wr = (acc & IB_ACCESS_REMOTE_WRITE) ? 1 : 0;
        mr->hwmr.remote_rd = (acc & IB_ACCESS_REMOTE_READ) ? 1 : 0;
        mr->hwmr.local_wr = (acc & IB_ACCESS_LOCAL_WRITE) ? 1 : 0;
        mr->hwmr.local_rd = 1;
        mr->hwmr.remote_atomic = (acc & IB_ACCESS_REMOTE_ATOMIC) ? 1 : 0;
        status = ocrdma_build_pbl_tbl(dev, &mr->hwmr);
        if (status)
                goto umem_err;
        build_user_pbes(dev, mr, num_pbes);
        status = ocrdma_reg_mr(dev, &mr->hwmr, pd->id, acc);
        if (status)
                goto mbx_err;
        mr->ibmr.lkey = mr->hwmr.lkey;
        if (mr->hwmr.remote_wr || mr->hwmr.remote_rd)
                mr->ibmr.rkey = mr->hwmr.lkey;

        return &mr->ibmr;

mbx_err:
        ocrdma_free_mr_pbl_tbl(dev, &mr->hwmr);
umem_err:
        kfree(mr);
        return ERR_PTR(status);
}

int ocrdma_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
{
        struct ocrdma_mr *mr = get_ocrdma_mr(ib_mr);
        struct ocrdma_dev *dev = get_ocrdma_dev(ib_mr->device);

        (void) ocrdma_mbx_dealloc_lkey(dev, mr->hwmr.fr_mr, mr->hwmr.lkey);

        kfree(mr->pages);
        ocrdma_free_mr_pbl_tbl(dev, &mr->hwmr);

        /* it could be user registered memory. */
        ib_umem_release(mr->umem);
        kfree(mr);

        /* Don't stop cleanup, in case FW is unresponsive */
        if (dev->mqe_ctx.fw_error_state) {
                pr_err("%s(%d) fw not responding.\n",
                       __func__, dev->id);
        }
        return 0;
}

static int ocrdma_copy_cq_uresp(struct ocrdma_dev *dev, struct ocrdma_cq *cq,
                                struct ib_udata *udata)
{
        int status;
        struct ocrdma_ucontext *uctx = rdma_udata_to_drv_context(
                udata, struct ocrdma_ucontext, ibucontext);
        struct ocrdma_create_cq_uresp uresp;

        /* this must be user flow! */
        if (!udata)
                return -EINVAL;

        memset(&uresp, 0, sizeof(uresp));
        uresp.cq_id = cq->id;
        uresp.page_size = PAGE_ALIGN(cq->len);
        uresp.num_pages = 1;
        uresp.max_hw_cqe = cq->max_hw_cqe;
        uresp.page_addr[0] = virt_to_phys(cq->va);
        uresp.db_page_addr =  ocrdma_get_db_addr(dev, uctx->cntxt_pd->id);
        uresp.db_page_size = dev->nic_info.db_page_size;
        uresp.phase_change = cq->phase_change ? 1 : 0;
        status = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
        if (status) {
                pr_err("%s(%d) copy error cqid=0x%x.\n",
                       __func__, dev->id, cq->id);
                goto err;
        }
        status = ocrdma_add_mmap(uctx, uresp.db_page_addr, uresp.db_page_size);
        if (status)
                goto err;
        status = ocrdma_add_mmap(uctx, uresp.page_addr[0], uresp.page_size);
        if (status) {
                ocrdma_del_mmap(uctx, uresp.db_page_addr, uresp.db_page_size);
                goto err;
        }
        cq->ucontext = uctx;
err:
        return status;
}

int ocrdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
                     struct ib_udata *udata)
{
        struct ib_device *ibdev = ibcq->device;
        int entries = attr->cqe;
        struct ocrdma_cq *cq = get_ocrdma_cq(ibcq);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibdev);
        struct ocrdma_ucontext *uctx = rdma_udata_to_drv_context(
                udata, struct ocrdma_ucontext, ibucontext);
        u16 pd_id = 0;
        int status;
        struct ocrdma_create_cq_ureq ureq;

        if (attr->flags)
                return -EINVAL;

        if (udata) {
                if (ib_copy_from_udata(&ureq, udata, sizeof(ureq)))
                        return -EFAULT;
        } else
                ureq.dpp_cq = 0;

        spin_lock_init(&cq->cq_lock);
        spin_lock_init(&cq->comp_handler_lock);
        INIT_LIST_HEAD(&cq->sq_head);
        INIT_LIST_HEAD(&cq->rq_head);

        if (udata)
                pd_id = uctx->cntxt_pd->id;

        status = ocrdma_mbx_create_cq(dev, cq, entries, ureq.dpp_cq, pd_id);
        if (status)
                return status;

        if (udata) {
                status = ocrdma_copy_cq_uresp(dev, cq, udata);
                if (status)
                        goto ctx_err;
        }
        cq->phase = OCRDMA_CQE_VALID;
        dev->cq_tbl[cq->id] = cq;
        return 0;

ctx_err:
        ocrdma_mbx_destroy_cq(dev, cq);
        return status;
}

int ocrdma_resize_cq(struct ib_cq *ibcq, int new_cnt,
                     struct ib_udata *udata)
{
        int status = 0;
        struct ocrdma_cq *cq = get_ocrdma_cq(ibcq);

        if (new_cnt < 1 || new_cnt > cq->max_hw_cqe) {
                status = -EINVAL;
                return status;
        }
        ibcq->cqe = new_cnt;
        return status;
}

static void ocrdma_flush_cq(struct ocrdma_cq *cq)
{
        int cqe_cnt;
        int valid_count = 0;
        unsigned long flags;

        struct ocrdma_dev *dev = get_ocrdma_dev(cq->ibcq.device);
        struct ocrdma_cqe *cqe = NULL;

        cqe = cq->va;
        cqe_cnt = cq->cqe_cnt;

        /* Last irq might have scheduled a polling thread
         * sync-up with it before hard flushing.
         */
        spin_lock_irqsave(&cq->cq_lock, flags);
        while (cqe_cnt) {
                if (is_cqe_valid(cq, cqe))
                        valid_count++;
                cqe++;
                cqe_cnt--;
        }
        ocrdma_ring_cq_db(dev, cq->id, false, false, valid_count);
        spin_unlock_irqrestore(&cq->cq_lock, flags);
}

void ocrdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
{
        struct ocrdma_cq *cq = get_ocrdma_cq(ibcq);
        struct ocrdma_eq *eq = NULL;
        struct ocrdma_dev *dev = get_ocrdma_dev(ibcq->device);
        int pdid = 0;
        u32 irq, indx;

        dev->cq_tbl[cq->id] = NULL;
        indx = ocrdma_get_eq_table_index(dev, cq->eqn);

        eq = &dev->eq_tbl[indx];
        irq = ocrdma_get_irq(dev, eq);
        synchronize_irq(irq);
        ocrdma_flush_cq(cq);

        ocrdma_mbx_destroy_cq(dev, cq);
        if (cq->ucontext) {
                pdid = cq->ucontext->cntxt_pd->id;
                ocrdma_del_mmap(cq->ucontext, (u64) cq->pa,
                                PAGE_ALIGN(cq->len));
                ocrdma_del_mmap(cq->ucontext,
                                ocrdma_get_db_addr(dev, pdid),
                                dev->nic_info.db_page_size);
        }
}

static int ocrdma_add_qpn_map(struct ocrdma_dev *dev, struct ocrdma_qp *qp)
{
        int status = -EINVAL;

        if (qp->id < OCRDMA_MAX_QP && dev->qp_tbl[qp->id] == NULL) {
                dev->qp_tbl[qp->id] = qp;
                status = 0;
        }
        return status;
}

static void ocrdma_del_qpn_map(struct ocrdma_dev *dev, struct ocrdma_qp *qp)
{
        dev->qp_tbl[qp->id] = NULL;
}

static int ocrdma_check_qp_params(struct ib_pd *ibpd, struct ocrdma_dev *dev,
                                  struct ib_qp_init_attr *attrs,
                                  struct ib_udata *udata)
{
        if ((attrs->qp_type != IB_QPT_GSI) &&
            (attrs->qp_type != IB_QPT_RC) &&
            (attrs->qp_type != IB_QPT_UC) &&
            (attrs->qp_type != IB_QPT_UD)) {
                pr_err("%s(%d) unsupported qp type=0x%x requested\n",
                       __func__, dev->id, attrs->qp_type);
                return -EINVAL;
        }
        /* Skip the check for QP1 to support CM size of 128 */
        if ((attrs->qp_type != IB_QPT_GSI) &&
            (attrs->cap.max_send_wr > dev->attr.max_wqe)) {
                pr_err("%s(%d) unsupported send_wr=0x%x requested\n",
                       __func__, dev->id, attrs->cap.max_send_wr);
                pr_err("%s(%d) supported send_wr=0x%x\n",
                       __func__, dev->id, dev->attr.max_wqe);
                return -EINVAL;
        }
        if (!attrs->srq && (attrs->cap.max_recv_wr > dev->attr.max_rqe)) {
                pr_err("%s(%d) unsupported recv_wr=0x%x requested\n",
                       __func__, dev->id, attrs->cap.max_recv_wr);
                pr_err("%s(%d) supported recv_wr=0x%x\n",
                       __func__, dev->id, dev->attr.max_rqe);
                return -EINVAL;
        }
        if (attrs->cap.max_inline_data > dev->attr.max_inline_data) {
                pr_err("%s(%d) unsupported inline data size=0x%x requested\n",
                       __func__, dev->id, attrs->cap.max_inline_data);
                pr_err("%s(%d) supported inline data size=0x%x\n",
                       __func__, dev->id, dev->attr.max_inline_data);
                return -EINVAL;
        }
        if (attrs->cap.max_send_sge > dev->attr.max_send_sge) {
                pr_err("%s(%d) unsupported send_sge=0x%x requested\n",
                       __func__, dev->id, attrs->cap.max_send_sge);
                pr_err("%s(%d) supported send_sge=0x%x\n",
                       __func__, dev->id, dev->attr.max_send_sge);
                return -EINVAL;
        }
        if (attrs->cap.max_recv_sge > dev->attr.max_recv_sge) {
                pr_err("%s(%d) unsupported recv_sge=0x%x requested\n",
                       __func__, dev->id, attrs->cap.max_recv_sge);
                pr_err("%s(%d) supported recv_sge=0x%x\n",
                       __func__, dev->id, dev->attr.max_recv_sge);
                return -EINVAL;
        }
        /* unprivileged user space cannot create special QP */
        if (udata && attrs->qp_type == IB_QPT_GSI) {
                pr_err
                    ("%s(%d) Userspace can't create special QPs of type=0x%x\n",
                     __func__, dev->id, attrs->qp_type);
                return -EINVAL;
        }
        /* allow creating only one GSI type of QP */
        if (attrs->qp_type == IB_QPT_GSI && dev->gsi_qp_created) {
                pr_err("%s(%d) GSI special QPs already created.\n",
                       __func__, dev->id);
                return -EINVAL;
        }
        /* verify consumer QPs are not trying to use GSI QP's CQ */
        if ((attrs->qp_type != IB_QPT_GSI) && (dev->gsi_qp_created)) {
                if ((dev->gsi_sqcq == get_ocrdma_cq(attrs->send_cq)) ||
                        (dev->gsi_rqcq == get_ocrdma_cq(attrs->recv_cq))) {
                        pr_err("%s(%d) Consumer QP cannot use GSI CQs.\n",
                                __func__, dev->id);
                        return -EINVAL;
                }
        }
        return 0;
}

static int ocrdma_copy_qp_uresp(struct ocrdma_qp *qp,
                                struct ib_udata *udata, int dpp_offset,
                                int dpp_credit_lmt, int srq)
{
        int status;
        u64 usr_db;
        struct ocrdma_create_qp_uresp uresp;
        struct ocrdma_pd *pd = qp->pd;
        struct ocrdma_dev *dev = get_ocrdma_dev(pd->ibpd.device);

        memset(&uresp, 0, sizeof(uresp));
        usr_db = dev->nic_info.unmapped_db +
                        (pd->id * dev->nic_info.db_page_size);
        uresp.qp_id = qp->id;
        uresp.sq_dbid = qp->sq.dbid;
        uresp.num_sq_pages = 1;
        uresp.sq_page_size = PAGE_ALIGN(qp->sq.len);
        uresp.sq_page_addr[0] = virt_to_phys(qp->sq.va);
        uresp.num_wqe_allocated = qp->sq.max_cnt;
        if (!srq) {
                uresp.rq_dbid = qp->rq.dbid;
                uresp.num_rq_pages = 1;
                uresp.rq_page_size = PAGE_ALIGN(qp->rq.len);
                uresp.rq_page_addr[0] = virt_to_phys(qp->rq.va);
                uresp.num_rqe_allocated = qp->rq.max_cnt;
        }
        uresp.db_page_addr = usr_db;
        uresp.db_page_size = dev->nic_info.db_page_size;
        uresp.db_sq_offset = OCRDMA_DB_GEN2_SQ_OFFSET;
        uresp.db_rq_offset = OCRDMA_DB_GEN2_RQ_OFFSET;
        uresp.db_shift = OCRDMA_DB_RQ_SHIFT;

        if (qp->dpp_enabled) {
                uresp.dpp_credit = dpp_credit_lmt;
                uresp.dpp_offset = dpp_offset;
        }
        status = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
        if (status) {
                pr_err("%s(%d) user copy error.\n", __func__, dev->id);
                goto err;
        }
        status = ocrdma_add_mmap(pd->uctx, uresp.sq_page_addr[0],
                                 uresp.sq_page_size);
        if (status)
                goto err;

        if (!srq) {
                status = ocrdma_add_mmap(pd->uctx, uresp.rq_page_addr[0],
                                         uresp.rq_page_size);
                if (status)
                        goto rq_map_err;
        }
        return status;
rq_map_err:
        ocrdma_del_mmap(pd->uctx, uresp.sq_page_addr[0], uresp.sq_page_size);
err:
        return status;
}

static void ocrdma_set_qp_db(struct ocrdma_dev *dev, struct ocrdma_qp *qp,
                             struct ocrdma_pd *pd)
{
        if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) {
                qp->sq_db = dev->nic_info.db +
                        (pd->id * dev->nic_info.db_page_size) +
                        OCRDMA_DB_GEN2_SQ_OFFSET;
                qp->rq_db = dev->nic_info.db +
                        (pd->id * dev->nic_info.db_page_size) +
                        OCRDMA_DB_GEN2_RQ_OFFSET;
        } else {
                qp->sq_db = dev->nic_info.db +
                        (pd->id * dev->nic_info.db_page_size) +
                        OCRDMA_DB_SQ_OFFSET;
                qp->rq_db = dev->nic_info.db +
                        (pd->id * dev->nic_info.db_page_size) +
                        OCRDMA_DB_RQ_OFFSET;
        }
}

static int ocrdma_alloc_wr_id_tbl(struct ocrdma_qp *qp)
{
        qp->wqe_wr_id_tbl =
            kcalloc(qp->sq.max_cnt, sizeof(*(qp->wqe_wr_id_tbl)),
                    GFP_KERNEL);
        if (qp->wqe_wr_id_tbl == NULL)
                return -ENOMEM;
        qp->rqe_wr_id_tbl =
            kcalloc(qp->rq.max_cnt, sizeof(u64), GFP_KERNEL);
        if (qp->rqe_wr_id_tbl == NULL)
                return -ENOMEM;

        return 0;
}

static void ocrdma_set_qp_init_params(struct ocrdma_qp *qp,
                                      struct ocrdma_pd *pd,
                                      struct ib_qp_init_attr *attrs)
{
        qp->pd = pd;
        spin_lock_init(&qp->q_lock);
        INIT_LIST_HEAD(&qp->sq_entry);
        INIT_LIST_HEAD(&qp->rq_entry);

        qp->qp_type = attrs->qp_type;
        qp->cap_flags = OCRDMA_QP_INB_RD | OCRDMA_QP_INB_WR;
        qp->max_inline_data = attrs->cap.max_inline_data;
        qp->sq.max_sges = attrs->cap.max_send_sge;
        qp->rq.max_sges = attrs->cap.max_recv_sge;
        qp->state = OCRDMA_QPS_RST;
        qp->signaled = (attrs->sq_sig_type == IB_SIGNAL_ALL_WR) ? true : false;
}

static void ocrdma_store_gsi_qp_cq(struct ocrdma_dev *dev,
                                   struct ib_qp_init_attr *attrs)
{
        if (attrs->qp_type == IB_QPT_GSI) {
                dev->gsi_qp_created = 1;
                dev->gsi_sqcq = get_ocrdma_cq(attrs->send_cq);
                dev->gsi_rqcq = get_ocrdma_cq(attrs->recv_cq);
        }
}

struct ib_qp *ocrdma_create_qp(struct ib_pd *ibpd,
                               struct ib_qp_init_attr *attrs,
                               struct ib_udata *udata)
{
        int status;
        struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
        struct ocrdma_qp *qp;
        struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
        struct ocrdma_create_qp_ureq ureq;
        u16 dpp_credit_lmt, dpp_offset;

        status = ocrdma_check_qp_params(ibpd, dev, attrs, udata);
        if (status)
                goto gen_err;

        memset(&ureq, 0, sizeof(ureq));
        if (udata) {
                if (ib_copy_from_udata(&ureq, udata, sizeof(ureq)))
                        return ERR_PTR(-EFAULT);
        }
        qp = kzalloc(sizeof(*qp), GFP_KERNEL);
        if (!qp) {
                status = -ENOMEM;
                goto gen_err;
        }
        ocrdma_set_qp_init_params(qp, pd, attrs);
        if (udata == NULL)
                qp->cap_flags |= (OCRDMA_QP_MW_BIND | OCRDMA_QP_LKEY0 |
                                        OCRDMA_QP_FAST_REG);

        mutex_lock(&dev->dev_lock);
        status = ocrdma_mbx_create_qp(qp, attrs, ureq.enable_dpp_cq,
                                        ureq.dpp_cq_id,
                                        &dpp_offset, &dpp_credit_lmt);
        if (status)
                goto mbx_err;

        /* user space QP's wr_id table are managed in library */
        if (udata == NULL) {
                status = ocrdma_alloc_wr_id_tbl(qp);
                if (status)
                        goto map_err;
        }

        status = ocrdma_add_qpn_map(dev, qp);
        if (status)
                goto map_err;
        ocrdma_set_qp_db(dev, qp, pd);
        if (udata) {
                status = ocrdma_copy_qp_uresp(qp, udata, dpp_offset,
                                              dpp_credit_lmt,
                                              (attrs->srq != NULL));
                if (status)
                        goto cpy_err;
        }
        ocrdma_store_gsi_qp_cq(dev, attrs);
        qp->ibqp.qp_num = qp->id;
        mutex_unlock(&dev->dev_lock);
        return &qp->ibqp;

cpy_err:
        ocrdma_del_qpn_map(dev, qp);
map_err:
        ocrdma_mbx_destroy_qp(dev, qp);
mbx_err:
        mutex_unlock(&dev->dev_lock);
        kfree(qp->wqe_wr_id_tbl);
        kfree(qp->rqe_wr_id_tbl);
        kfree(qp);
        pr_err("%s(%d) error=%d\n", __func__, dev->id, status);
gen_err:
        return ERR_PTR(status);
}

int _ocrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                      int attr_mask)
{
        int status = 0;
        struct ocrdma_qp *qp;
        struct ocrdma_dev *dev;
        enum ib_qp_state old_qps;

        qp = get_ocrdma_qp(ibqp);
        dev = get_ocrdma_dev(ibqp->device);
        if (attr_mask & IB_QP_STATE)
                status = ocrdma_qp_state_change(qp, attr->qp_state, &old_qps);
        /* if new and previous states are same hw doesn't need to
         * know about it.
         */
        if (status < 0)
                return status;
        return ocrdma_mbx_modify_qp(dev, qp, attr, attr_mask);
}

int ocrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                     int attr_mask, struct ib_udata *udata)
{
        unsigned long flags;
        int status = -EINVAL;
        struct ocrdma_qp *qp;
        struct ocrdma_dev *dev;
        enum ib_qp_state old_qps, new_qps;

        qp = get_ocrdma_qp(ibqp);
        dev = get_ocrdma_dev(ibqp->device);

        /* syncronize with multiple context trying to change, retrive qps */
        mutex_lock(&dev->dev_lock);
        /* syncronize with wqe, rqe posting and cqe processing contexts */
        spin_lock_irqsave(&qp->q_lock, flags);
        old_qps = get_ibqp_state(qp->state);
        if (attr_mask & IB_QP_STATE)
                new_qps = attr->qp_state;
        else
                new_qps = old_qps;
        spin_unlock_irqrestore(&qp->q_lock, flags);

        if (!ib_modify_qp_is_ok(old_qps, new_qps, ibqp->qp_type, attr_mask)) {
                pr_err("%s(%d) invalid attribute mask=0x%x specified for\n"
                       "qpn=0x%x of type=0x%x old_qps=0x%x, new_qps=0x%x\n",
                       __func__, dev->id, attr_mask, qp->id, ibqp->qp_type,
                       old_qps, new_qps);
                goto param_err;
        }

        status = _ocrdma_modify_qp(ibqp, attr, attr_mask);
        if (status > 0)
                status = 0;
param_err:
        mutex_unlock(&dev->dev_lock);
        return status;
}

static enum ib_mtu ocrdma_mtu_int_to_enum(u16 mtu)
{
        switch (mtu) {
        case 256:
                return IB_MTU_256;
        case 512:
                return IB_MTU_512;
        case 1024:
                return IB_MTU_1024;
        case 2048:
                return IB_MTU_2048;
        case 4096:
                return IB_MTU_4096;
        default:
                return IB_MTU_1024;
        }
}

static int ocrdma_to_ib_qp_acc_flags(int qp_cap_flags)
{
        int ib_qp_acc_flags = 0;

        if (qp_cap_flags & OCRDMA_QP_INB_WR)
                ib_qp_acc_flags |= IB_ACCESS_REMOTE_WRITE;
        if (qp_cap_flags & OCRDMA_QP_INB_RD)
                ib_qp_acc_flags |= IB_ACCESS_LOCAL_WRITE;
        return ib_qp_acc_flags;
}

int ocrdma_query_qp(struct ib_qp *ibqp,
                    struct ib_qp_attr *qp_attr,
                    int attr_mask, struct ib_qp_init_attr *qp_init_attr)
{
        int status;
        u32 qp_state;
        struct ocrdma_qp_params params;
        struct ocrdma_qp *qp = get_ocrdma_qp(ibqp);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibqp->device);

        memset(&params, 0, sizeof(params));
        mutex_lock(&dev->dev_lock);
        status = ocrdma_mbx_query_qp(dev, qp, &params);
        mutex_unlock(&dev->dev_lock);
        if (status)
                goto mbx_err;
        if (qp->qp_type == IB_QPT_UD)
                qp_attr->qkey = params.qkey;
        qp_attr->path_mtu =
                ocrdma_mtu_int_to_enum(params.path_mtu_pkey_indx &
                                OCRDMA_QP_PARAMS_PATH_MTU_MASK) >>
                                OCRDMA_QP_PARAMS_PATH_MTU_SHIFT;
        qp_attr->path_mig_state = IB_MIG_MIGRATED;
        qp_attr->rq_psn = params.hop_lmt_rq_psn & OCRDMA_QP_PARAMS_RQ_PSN_MASK;
        qp_attr->sq_psn = params.tclass_sq_psn & OCRDMA_QP_PARAMS_SQ_PSN_MASK;
        qp_attr->dest_qp_num =
            params.ack_to_rnr_rtc_dest_qpn & OCRDMA_QP_PARAMS_DEST_QPN_MASK;

        qp_attr->qp_access_flags = ocrdma_to_ib_qp_acc_flags(qp->cap_flags);
        qp_attr->cap.max_send_wr = qp->sq.max_cnt - 1;
        qp_attr->cap.max_recv_wr = qp->rq.max_cnt - 1;
        qp_attr->cap.max_send_sge = qp->sq.max_sges;
        qp_attr->cap.max_recv_sge = qp->rq.max_sges;
        qp_attr->cap.max_inline_data = qp->max_inline_data;
        qp_init_attr->cap = qp_attr->cap;
        qp_attr->ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;

        rdma_ah_set_grh(&qp_attr->ah_attr, NULL,
                        params.rnt_rc_sl_fl &
                          OCRDMA_QP_PARAMS_FLOW_LABEL_MASK,
                        qp->sgid_idx,
                        (params.hop_lmt_rq_psn &
                         OCRDMA_QP_PARAMS_HOP_LMT_MASK) >>
                         OCRDMA_QP_PARAMS_HOP_LMT_SHIFT,
                        (params.tclass_sq_psn &
                         OCRDMA_QP_PARAMS_TCLASS_MASK) >>
                         OCRDMA_QP_PARAMS_TCLASS_SHIFT);
        rdma_ah_set_dgid_raw(&qp_attr->ah_attr, &params.dgid[0]);

        rdma_ah_set_port_num(&qp_attr->ah_attr, 1);
        rdma_ah_set_sl(&qp_attr->ah_attr, (params.rnt_rc_sl_fl &
                                           OCRDMA_QP_PARAMS_SL_MASK) >>
                                           OCRDMA_QP_PARAMS_SL_SHIFT);
        qp_attr->timeout = (params.ack_to_rnr_rtc_dest_qpn &
                            OCRDMA_QP_PARAMS_ACK_TIMEOUT_MASK) >>
                                OCRDMA_QP_PARAMS_ACK_TIMEOUT_SHIFT;
        qp_attr->rnr_retry = (params.ack_to_rnr_rtc_dest_qpn &
                              OCRDMA_QP_PARAMS_RNR_RETRY_CNT_MASK) >>
                                OCRDMA_QP_PARAMS_RNR_RETRY_CNT_SHIFT;
        qp_attr->retry_cnt =
            (params.rnt_rc_sl_fl & OCRDMA_QP_PARAMS_RETRY_CNT_MASK) >>
                OCRDMA_QP_PARAMS_RETRY_CNT_SHIFT;
        qp_attr->min_rnr_timer = 0;
        qp_attr->pkey_index = 0;
        qp_attr->port_num = 1;
        rdma_ah_set_path_bits(&qp_attr->ah_attr, 0);
        rdma_ah_set_static_rate(&qp_attr->ah_attr, 0);
        qp_attr->alt_pkey_index = 0;
        qp_attr->alt_port_num = 0;
        qp_attr->alt_timeout = 0;
        memset(&qp_attr->alt_ah_attr, 0, sizeof(qp_attr->alt_ah_attr));
        qp_state = (params.max_sge_recv_flags & OCRDMA_QP_PARAMS_STATE_MASK) >>
                    OCRDMA_QP_PARAMS_STATE_SHIFT;
        qp_attr->qp_state = get_ibqp_state(qp_state);
        qp_attr->cur_qp_state = qp_attr->qp_state;
        qp_attr->sq_draining = (qp_state == OCRDMA_QPS_SQ_DRAINING) ? 1 : 0;
        qp_attr->max_dest_rd_atomic =
            params.max_ord_ird >> OCRDMA_QP_PARAMS_MAX_ORD_SHIFT;
        qp_attr->max_rd_atomic =
            params.max_ord_ird & OCRDMA_QP_PARAMS_MAX_IRD_MASK;
        qp_attr->en_sqd_async_notify = (params.max_sge_recv_flags &
                                OCRDMA_QP_PARAMS_FLAGS_SQD_ASYNC) ? 1 : 0;
        /* Sync driver QP state with FW */
        ocrdma_qp_state_change(qp, qp_attr->qp_state, NULL);
mbx_err:
        return status;
}

static void ocrdma_srq_toggle_bit(struct ocrdma_srq *srq, unsigned int idx)
{
        unsigned int i = idx / 32;
        u32 mask = (1U << (idx % 32));

        srq->idx_bit_fields[i] ^= mask;
}

static int ocrdma_hwq_free_cnt(struct ocrdma_qp_hwq_info *q)
{
        return ((q->max_wqe_idx - q->head) + q->tail) % q->max_cnt;
}

static int is_hw_sq_empty(struct ocrdma_qp *qp)
{
        return (qp->sq.tail == qp->sq.head);
}

static int is_hw_rq_empty(struct ocrdma_qp *qp)
{
        return (qp->rq.tail == qp->rq.head);
}

static void *ocrdma_hwq_head(struct ocrdma_qp_hwq_info *q)
{
        return q->va + (q->head * q->entry_size);
}

static void *ocrdma_hwq_head_from_idx(struct ocrdma_qp_hwq_info *q,
                                      u32 idx)
{
        return q->va + (idx * q->entry_size);
}

static void ocrdma_hwq_inc_head(struct ocrdma_qp_hwq_info *q)
{
        q->head = (q->head + 1) & q->max_wqe_idx;
}

static void ocrdma_hwq_inc_tail(struct ocrdma_qp_hwq_info *q)
{
        q->tail = (q->tail + 1) & q->max_wqe_idx;
}

/* discard the cqe for a given QP */
static void ocrdma_discard_cqes(struct ocrdma_qp *qp, struct ocrdma_cq *cq)
{
        unsigned long cq_flags;
        unsigned long flags;
        int discard_cnt = 0;
        u32 cur_getp, stop_getp;
        struct ocrdma_cqe *cqe;
        u32 qpn = 0, wqe_idx = 0;

        spin_lock_irqsave(&cq->cq_lock, cq_flags);

        /* traverse through the CQEs in the hw CQ,
         * find the matching CQE for a given qp,
         * mark the matching one discarded by clearing qpn.
         * ring the doorbell in the poll_cq() as
         * we don't complete out of order cqe.
         */

        cur_getp = cq->getp;
        /* find upto when do we reap the cq. */
        stop_getp = cur_getp;
        do {
                if (is_hw_sq_empty(qp) && (!qp->srq && is_hw_rq_empty(qp)))
                        break;

                cqe = cq->va + cur_getp;
                /* if (a) done reaping whole hw cq, or
                 *    (b) qp_xq becomes empty.
                 * then exit
                 */
                qpn = cqe->cmn.qpn & OCRDMA_CQE_QPN_MASK;
                /* if previously discarded cqe found, skip that too. */
                /* check for matching qp */
                if (qpn == 0 || qpn != qp->id)
                        goto skip_cqe;

                if (is_cqe_for_sq(cqe)) {
                        ocrdma_hwq_inc_tail(&qp->sq);
                } else {
                        if (qp->srq) {
                                wqe_idx = (le32_to_cpu(cqe->rq.buftag_qpn) >>
                                        OCRDMA_CQE_BUFTAG_SHIFT) &
                                        qp->srq->rq.max_wqe_idx;
                                BUG_ON(wqe_idx < 1);
                                spin_lock_irqsave(&qp->srq->q_lock, flags);
                                ocrdma_hwq_inc_tail(&qp->srq->rq);
                                ocrdma_srq_toggle_bit(qp->srq, wqe_idx - 1);
                                spin_unlock_irqrestore(&qp->srq->q_lock, flags);

                        } else {
                                ocrdma_hwq_inc_tail(&qp->rq);
                        }
                }
                /* mark cqe discarded so that it is not picked up later
                 * in the poll_cq().
                 */
                discard_cnt += 1;
                cqe->cmn.qpn = 0;
skip_cqe:
                cur_getp = (cur_getp + 1) % cq->max_hw_cqe;
        } while (cur_getp != stop_getp);
        spin_unlock_irqrestore(&cq->cq_lock, cq_flags);
}

void ocrdma_del_flush_qp(struct ocrdma_qp *qp)
{
        int found = false;
        unsigned long flags;
        struct ocrdma_dev *dev = get_ocrdma_dev(qp->ibqp.device);
        /* sync with any active CQ poll */

        spin_lock_irqsave(&dev->flush_q_lock, flags);
        found = ocrdma_is_qp_in_sq_flushlist(qp->sq_cq, qp);
        if (found)
                list_del(&qp->sq_entry);
        if (!qp->srq) {
                found = ocrdma_is_qp_in_rq_flushlist(qp->rq_cq, qp);
                if (found)
                        list_del(&qp->rq_entry);
        }
        spin_unlock_irqrestore(&dev->flush_q_lock, flags);
}

int ocrdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
{
        struct ocrdma_pd *pd;
        struct ocrdma_qp *qp;
        struct ocrdma_dev *dev;
        struct ib_qp_attr attrs;
        int attr_mask;
        unsigned long flags;

        qp = get_ocrdma_qp(ibqp);
        dev = get_ocrdma_dev(ibqp->device);

        pd = qp->pd;

        /* change the QP state to ERROR */
        if (qp->state != OCRDMA_QPS_RST) {
                attrs.qp_state = IB_QPS_ERR;
                attr_mask = IB_QP_STATE;
                _ocrdma_modify_qp(ibqp, &attrs, attr_mask);
        }
        /* ensure that CQEs for newly created QP (whose id may be same with
         * one which just getting destroyed are same), dont get
         * discarded until the old CQEs are discarded.
         */
        mutex_lock(&dev->dev_lock);
        (void) ocrdma_mbx_destroy_qp(dev, qp);

        /*
         * acquire CQ lock while destroy is in progress, in order to
         * protect against proessing in-flight CQEs for this QP.
         */
        spin_lock_irqsave(&qp->sq_cq->cq_lock, flags);
        if (qp->rq_cq && (qp->rq_cq != qp->sq_cq)) {
                spin_lock(&qp->rq_cq->cq_lock);
                ocrdma_del_qpn_map(dev, qp);
                spin_unlock(&qp->rq_cq->cq_lock);
        } else {
                ocrdma_del_qpn_map(dev, qp);
        }
        spin_unlock_irqrestore(&qp->sq_cq->cq_lock, flags);

        if (!pd->uctx) {
                ocrdma_discard_cqes(qp, qp->sq_cq);
                ocrdma_discard_cqes(qp, qp->rq_cq);
        }
        mutex_unlock(&dev->dev_lock);

        if (pd->uctx) {
                ocrdma_del_mmap(pd->uctx, (u64) qp->sq.pa,
                                PAGE_ALIGN(qp->sq.len));
                if (!qp->srq)
                        ocrdma_del_mmap(pd->uctx, (u64) qp->rq.pa,
                                        PAGE_ALIGN(qp->rq.len));
        }

        ocrdma_del_flush_qp(qp);

        kfree(qp->wqe_wr_id_tbl);
        kfree(qp->rqe_wr_id_tbl);
        kfree(qp);
        return 0;
}

static int ocrdma_copy_srq_uresp(struct ocrdma_dev *dev, struct ocrdma_srq *srq,
                                struct ib_udata *udata)
{
        int status;
        struct ocrdma_create_srq_uresp uresp;

        memset(&uresp, 0, sizeof(uresp));
        uresp.rq_dbid = srq->rq.dbid;
        uresp.num_rq_pages = 1;
        uresp.rq_page_addr[0] = virt_to_phys(srq->rq.va);
        uresp.rq_page_size = srq->rq.len;
        uresp.db_page_addr = dev->nic_info.unmapped_db +
            (srq->pd->id * dev->nic_info.db_page_size);
        uresp.db_page_size = dev->nic_info.db_page_size;
        uresp.num_rqe_allocated = srq->rq.max_cnt;
        if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) {
                uresp.db_rq_offset = OCRDMA_DB_GEN2_RQ_OFFSET;
                uresp.db_shift = 24;
        } else {
                uresp.db_rq_offset = OCRDMA_DB_RQ_OFFSET;
                uresp.db_shift = 16;
        }

        status = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
        if (status)
                return status;
        status = ocrdma_add_mmap(srq->pd->uctx, uresp.rq_page_addr[0],
                                 uresp.rq_page_size);
        if (status)
                return status;
        return status;
}

int ocrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr,
                      struct ib_udata *udata)
{
        int status;
        struct ocrdma_pd *pd = get_ocrdma_pd(ibsrq->pd);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibsrq->device);
        struct ocrdma_srq *srq = get_ocrdma_srq(ibsrq);

        if (init_attr->attr.max_sge > dev->attr.max_recv_sge)
                return -EINVAL;
        if (init_attr->attr.max_wr > dev->attr.max_rqe)
                return -EINVAL;

        spin_lock_init(&srq->q_lock);
        srq->pd = pd;
        srq->db = dev->nic_info.db + (pd->id * dev->nic_info.db_page_size);
        status = ocrdma_mbx_create_srq(dev, srq, init_attr, pd);
        if (status)
                return status;

        if (!udata) {
                srq->rqe_wr_id_tbl = kcalloc(srq->rq.max_cnt, sizeof(u64),
                                             GFP_KERNEL);
                if (!srq->rqe_wr_id_tbl) {
                        status = -ENOMEM;
                        goto arm_err;
                }

                srq->bit_fields_len = (srq->rq.max_cnt / 32) +
                    (srq->rq.max_cnt % 32 ? 1 : 0);
                srq->idx_bit_fields =
                    kmalloc_array(srq->bit_fields_len, sizeof(u32),
                                  GFP_KERNEL);
                if (!srq->idx_bit_fields) {
                        status = -ENOMEM;
                        goto arm_err;
                }
                memset(srq->idx_bit_fields, 0xff,
                       srq->bit_fields_len * sizeof(u32));
        }

        if (init_attr->attr.srq_limit) {
                status = ocrdma_mbx_modify_srq(srq, &init_attr->attr);
                if (status)
                        goto arm_err;
        }

        if (udata) {
                status = ocrdma_copy_srq_uresp(dev, srq, udata);
                if (status)
                        goto arm_err;
        }

        return 0;

arm_err:
        ocrdma_mbx_destroy_srq(dev, srq);
        kfree(srq->rqe_wr_id_tbl);
        kfree(srq->idx_bit_fields);
        return status;
}

int ocrdma_modify_srq(struct ib_srq *ibsrq,
                      struct ib_srq_attr *srq_attr,
                      enum ib_srq_attr_mask srq_attr_mask,
                      struct ib_udata *udata)
{
        int status;
        struct ocrdma_srq *srq;

        srq = get_ocrdma_srq(ibsrq);
        if (srq_attr_mask & IB_SRQ_MAX_WR)
                status = -EINVAL;
        else
                status = ocrdma_mbx_modify_srq(srq, srq_attr);
        return status;
}

int ocrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
{
        int status;
        struct ocrdma_srq *srq;

        srq = get_ocrdma_srq(ibsrq);
        status = ocrdma_mbx_query_srq(srq, srq_attr);
        return status;
}

void ocrdma_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
{
        struct ocrdma_srq *srq;
        struct ocrdma_dev *dev = get_ocrdma_dev(ibsrq->device);

        srq = get_ocrdma_srq(ibsrq);

        ocrdma_mbx_destroy_srq(dev, srq);

        if (srq->pd->uctx)
                ocrdma_del_mmap(srq->pd->uctx, (u64) srq->rq.pa,
                                PAGE_ALIGN(srq->rq.len));

        kfree(srq->idx_bit_fields);
        kfree(srq->rqe_wr_id_tbl);
}

/* unprivileged verbs and their support functions. */
static void ocrdma_build_ud_hdr(struct ocrdma_qp *qp,
                                struct ocrdma_hdr_wqe *hdr,
                                const struct ib_send_wr *wr)
{
        struct ocrdma_ewqe_ud_hdr *ud_hdr =
                (struct ocrdma_ewqe_ud_hdr *)(hdr + 1);
        struct ocrdma_ah *ah = get_ocrdma_ah(ud_wr(wr)->ah);

        ud_hdr->rsvd_dest_qpn = ud_wr(wr)->remote_qpn;
        if (qp->qp_type == IB_QPT_GSI)
                ud_hdr->qkey = qp->qkey;
        else
                ud_hdr->qkey = ud_wr(wr)->remote_qkey;
        ud_hdr->rsvd_ahid = ah->id;
        ud_hdr->hdr_type = ah->hdr_type;
        if (ah->av->valid & OCRDMA_AV_VLAN_VALID)
                hdr->cw |= (OCRDMA_FLAG_AH_VLAN_PR << OCRDMA_WQE_FLAGS_SHIFT);
}

static void ocrdma_build_sges(struct ocrdma_hdr_wqe *hdr,
                              struct ocrdma_sge *sge, int num_sge,
                              struct ib_sge *sg_list)
{
        int i;

        for (i = 0; i < num_sge; i++) {
                sge[i].lrkey = sg_list[i].lkey;
                sge[i].addr_lo = sg_list[i].addr;
                sge[i].addr_hi = upper_32_bits(sg_list[i].addr);
                sge[i].len = sg_list[i].length;
                hdr->total_len += sg_list[i].length;
        }
        if (num_sge == 0)
                memset(sge, 0, sizeof(*sge));
}

static inline uint32_t ocrdma_sglist_len(struct ib_sge *sg_list, int num_sge)
{
        uint32_t total_len = 0, i;

        for (i = 0; i < num_sge; i++)
                total_len += sg_list[i].length;
        return total_len;
}


static int ocrdma_build_inline_sges(struct ocrdma_qp *qp,
                                    struct ocrdma_hdr_wqe *hdr,
                                    struct ocrdma_sge *sge,
                                    const struct ib_send_wr *wr, u32 wqe_size)
{
        int i;
        char *dpp_addr;

        if (wr->send_flags & IB_SEND_INLINE && qp->qp_type != IB_QPT_UD) {
                hdr->total_len = ocrdma_sglist_len(wr->sg_list, wr->num_sge);
                if (unlikely(hdr->total_len > qp->max_inline_data)) {
                        pr_err("%s() supported_len=0x%x,\n"
                               " unsupported len req=0x%x\n", __func__,
                                qp->max_inline_data, hdr->total_len);
                        return -EINVAL;
                }
                dpp_addr = (char *)sge;
                for (i = 0; i < wr->num_sge; i++) {
                        memcpy(dpp_addr,
                               (void *)(unsigned long)wr->sg_list[i].addr,
                               wr->sg_list[i].length);
                        dpp_addr += wr->sg_list[i].length;
                }

                wqe_size += roundup(hdr->total_len, OCRDMA_WQE_ALIGN_BYTES);
                if (0 == hdr->total_len)
                        wqe_size += sizeof(struct ocrdma_sge);
                hdr->cw |= (OCRDMA_TYPE_INLINE << OCRDMA_WQE_TYPE_SHIFT);
        } else {
                ocrdma_build_sges(hdr, sge, wr->num_sge, wr->sg_list);
                if (wr->num_sge)
                        wqe_size += (wr->num_sge * sizeof(struct ocrdma_sge));
                else
                        wqe_size += sizeof(struct ocrdma_sge);
                hdr->cw |= (OCRDMA_TYPE_LKEY << OCRDMA_WQE_TYPE_SHIFT);
        }
        hdr->cw |= ((wqe_size / OCRDMA_WQE_STRIDE) << OCRDMA_WQE_SIZE_SHIFT);
        return 0;
}

static int ocrdma_build_send(struct ocrdma_qp *qp, struct ocrdma_hdr_wqe *hdr,
                             const struct ib_send_wr *wr)
{
        int status;
        struct ocrdma_sge *sge;
        u32 wqe_size = sizeof(*hdr);

        if (qp->qp_type == IB_QPT_UD || qp->qp_type == IB_QPT_GSI) {
                ocrdma_build_ud_hdr(qp, hdr, wr);
                sge = (struct ocrdma_sge *)(hdr + 2);
                wqe_size += sizeof(struct ocrdma_ewqe_ud_hdr);
        } else {
                sge = (struct ocrdma_sge *)(hdr + 1);
        }

        status = ocrdma_build_inline_sges(qp, hdr, sge, wr, wqe_size);
        return status;
}

static int ocrdma_build_write(struct ocrdma_qp *qp, struct ocrdma_hdr_wqe *hdr,
                              const struct ib_send_wr *wr)
{
        int status;
        struct ocrdma_sge *ext_rw = (struct ocrdma_sge *)(hdr + 1);
        struct ocrdma_sge *sge = ext_rw + 1;
        u32 wqe_size = sizeof(*hdr) + sizeof(*ext_rw);

        status = ocrdma_build_inline_sges(qp, hdr, sge, wr, wqe_size);
        if (status)

                return status;
        ext_rw->addr_lo = rdma_wr(wr)->remote_addr;
        ext_rw->addr_hi = upper_32_bits(rdma_wr(wr)->remote_addr);
        ext_rw->lrkey = rdma_wr(wr)->rkey;
        ext_rw->len = hdr->total_len;
        return 0;
}

static void ocrdma_build_read(struct ocrdma_qp *qp, struct ocrdma_hdr_wqe *hdr,
                              const struct ib_send_wr *wr)
{
        struct ocrdma_sge *ext_rw = (struct ocrdma_sge *)(hdr + 1);
        struct ocrdma_sge *sge = ext_rw + 1;
        u32 wqe_size = ((wr->num_sge + 1) * sizeof(struct ocrdma_sge)) +
            sizeof(struct ocrdma_hdr_wqe);

        ocrdma_build_sges(hdr, sge, wr->num_sge, wr->sg_list);
        hdr->cw |= ((wqe_size / OCRDMA_WQE_STRIDE) << OCRDMA_WQE_SIZE_SHIFT);
        hdr->cw |= (OCRDMA_READ << OCRDMA_WQE_OPCODE_SHIFT);
        hdr->cw |= (OCRDMA_TYPE_LKEY << OCRDMA_WQE_TYPE_SHIFT);

        ext_rw->addr_lo = rdma_wr(wr)->remote_addr;
        ext_rw->addr_hi = upper_32_bits(rdma_wr(wr)->remote_addr);
        ext_rw->lrkey = rdma_wr(wr)->rkey;
        ext_rw->len = hdr->total_len;
}

static int get_encoded_page_size(int pg_sz)
{
        /* Max size is 256M 4096 << 16 */
        int i = 0;
        for (; i < 17; i++)
                if (pg_sz == (4096 << i))
                        break;
        return i;
}

static int ocrdma_build_reg(struct ocrdma_qp *qp,
                            struct ocrdma_hdr_wqe *hdr,
                            const struct ib_reg_wr *wr)
{
        u64 fbo;
        struct ocrdma_ewqe_fr *fast_reg = (struct ocrdma_ewqe_fr *)(hdr + 1);
        struct ocrdma_mr *mr = get_ocrdma_mr(wr->mr);
        struct ocrdma_pbl *pbl_tbl = mr->hwmr.pbl_table;
        struct ocrdma_pbe *pbe;
        u32 wqe_size = sizeof(*fast_reg) + sizeof(*hdr);
        int num_pbes = 0, i;

        wqe_size = roundup(wqe_size, OCRDMA_WQE_ALIGN_BYTES);

        hdr->cw |= (OCRDMA_FR_MR << OCRDMA_WQE_OPCODE_SHIFT);
        hdr->cw |= ((wqe_size / OCRDMA_WQE_STRIDE) << OCRDMA_WQE_SIZE_SHIFT);

        if (wr->access & IB_ACCESS_LOCAL_WRITE)
                hdr->rsvd_lkey_flags |= OCRDMA_LKEY_FLAG_LOCAL_WR;
        if (wr->access & IB_ACCESS_REMOTE_WRITE)
                hdr->rsvd_lkey_flags |= OCRDMA_LKEY_FLAG_REMOTE_WR;
        if (wr->access & IB_ACCESS_REMOTE_READ)
                hdr->rsvd_lkey_flags |= OCRDMA_LKEY_FLAG_REMOTE_RD;
        hdr->lkey = wr->key;
        hdr->total_len = mr->ibmr.length;

        fbo = mr->ibmr.iova - mr->pages[0];

        fast_reg->va_hi = upper_32_bits(mr->ibmr.iova);
        fast_reg->va_lo = (u32) (mr->ibmr.iova & 0xffffffff);
        fast_reg->fbo_hi = upper_32_bits(fbo);
        fast_reg->fbo_lo = (u32) fbo & 0xffffffff;
        fast_reg->num_sges = mr->npages;
        fast_reg->size_sge = get_encoded_page_size(mr->ibmr.page_size);

        pbe = pbl_tbl->va;
        for (i = 0; i < mr->npages; i++) {
                u64 buf_addr = mr->pages[i];

                pbe->pa_lo = cpu_to_le32((u32) (buf_addr & PAGE_MASK));
                pbe->pa_hi = cpu_to_le32((u32) upper_32_bits(buf_addr));
                num_pbes += 1;
                pbe++;

                /* if the pbl is full storing the pbes,
                 * move to next pbl.
                */
                if (num_pbes == (mr->hwmr.pbl_size/sizeof(u64))) {
                        pbl_tbl++;
                        pbe = (struct ocrdma_pbe *)pbl_tbl->va;
                }
        }

        return 0;
}

static void ocrdma_ring_sq_db(struct ocrdma_qp *qp)
{
        u32 val = qp->sq.dbid | (1 << OCRDMA_DB_SQ_SHIFT);

        iowrite32(val, qp->sq_db);
}

int ocrdma_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
                     const struct ib_send_wr **bad_wr)
{
        int status = 0;
        struct ocrdma_qp *qp = get_ocrdma_qp(ibqp);
        struct ocrdma_hdr_wqe *hdr;
        unsigned long flags;

        spin_lock_irqsave(&qp->q_lock, flags);
        if (qp->state != OCRDMA_QPS_RTS && qp->state != OCRDMA_QPS_SQD) {
                spin_unlock_irqrestore(&qp->q_lock, flags);
                *bad_wr = wr;
                return -EINVAL;
        }

        while (wr) {
                if (qp->qp_type == IB_QPT_UD &&
                    (wr->opcode != IB_WR_SEND &&
                     wr->opcode != IB_WR_SEND_WITH_IMM)) {
                        *bad_wr = wr;
                        status = -EINVAL;
                        break;
                }
                if (ocrdma_hwq_free_cnt(&qp->sq) == 0 ||
                    wr->num_sge > qp->sq.max_sges) {
                        *bad_wr = wr;
                        status = -ENOMEM;
                        break;
                }
                hdr = ocrdma_hwq_head(&qp->sq);
                hdr->cw = 0;
                if (wr->send_flags & IB_SEND_SIGNALED || qp->signaled)
                        hdr->cw |= (OCRDMA_FLAG_SIG << OCRDMA_WQE_FLAGS_SHIFT);
                if (wr->send_flags & IB_SEND_FENCE)
                        hdr->cw |=
                            (OCRDMA_FLAG_FENCE_L << OCRDMA_WQE_FLAGS_SHIFT);
                if (wr->send_flags & IB_SEND_SOLICITED)
                        hdr->cw |=
                            (OCRDMA_FLAG_SOLICIT << OCRDMA_WQE_FLAGS_SHIFT);
                hdr->total_len = 0;
                switch (wr->opcode) {
                case IB_WR_SEND_WITH_IMM:
                        hdr->cw |= (OCRDMA_FLAG_IMM << OCRDMA_WQE_FLAGS_SHIFT);
                        hdr->immdt = ntohl(wr->ex.imm_data);
                        /* fall through */
                case IB_WR_SEND:
                        hdr->cw |= (OCRDMA_SEND << OCRDMA_WQE_OPCODE_SHIFT);
                        ocrdma_build_send(qp, hdr, wr);
                        break;
                case IB_WR_SEND_WITH_INV:
                        hdr->cw |= (OCRDMA_FLAG_INV << OCRDMA_WQE_FLAGS_SHIFT);
                        hdr->cw |= (OCRDMA_SEND << OCRDMA_WQE_OPCODE_SHIFT);
                        hdr->lkey = wr->ex.invalidate_rkey;
                        status = ocrdma_build_send(qp, hdr, wr);
                        break;
                case IB_WR_RDMA_WRITE_WITH_IMM:
                        hdr->cw |= (OCRDMA_FLAG_IMM << OCRDMA_WQE_FLAGS_SHIFT);
                        hdr->immdt = ntohl(wr->ex.imm_data);
                        /* fall through */
                case IB_WR_RDMA_WRITE:
                        hdr->cw |= (OCRDMA_WRITE << OCRDMA_WQE_OPCODE_SHIFT);
                        status = ocrdma_build_write(qp, hdr, wr);
                        break;
                case IB_WR_RDMA_READ:
                        ocrdma_build_read(qp, hdr, wr);
                        break;
                case IB_WR_LOCAL_INV:
                        hdr->cw |=
                            (OCRDMA_LKEY_INV << OCRDMA_WQE_OPCODE_SHIFT);
                        hdr->cw |= ((sizeof(struct ocrdma_hdr_wqe) +
                                        sizeof(struct ocrdma_sge)) /
                                OCRDMA_WQE_STRIDE) << OCRDMA_WQE_SIZE_SHIFT;
                        hdr->lkey = wr->ex.invalidate_rkey;
                        break;
                case IB_WR_REG_MR:
                        status = ocrdma_build_reg(qp, hdr, reg_wr(wr));
                        break;
                default:
                        status = -EINVAL;
                        break;
                }
                if (status) {
                        *bad_wr = wr;
                        break;
                }
                if (wr->send_flags & IB_SEND_SIGNALED || qp->signaled)
                        qp->wqe_wr_id_tbl[qp->sq.head].signaled = 1;
                else
                        qp->wqe_wr_id_tbl[qp->sq.head].signaled = 0;
                qp->wqe_wr_id_tbl[qp->sq.head].wrid = wr->wr_id;
                ocrdma_cpu_to_le32(hdr, ((hdr->cw >> OCRDMA_WQE_SIZE_SHIFT) &
                                   OCRDMA_WQE_SIZE_MASK) * OCRDMA_WQE_STRIDE);
                /* make sure wqe is written before adapter can access it */
                wmb();
                /* inform hw to start processing it */
                ocrdma_ring_sq_db(qp);

                /* update pointer, counter for next wr */
                ocrdma_hwq_inc_head(&qp->sq);
                wr = wr->next;
        }
        spin_unlock_irqrestore(&qp->q_lock, flags);
        return status;
}

static void ocrdma_ring_rq_db(struct ocrdma_qp *qp)
{
        u32 val = qp->rq.dbid | (1 << OCRDMA_DB_RQ_SHIFT);

        iowrite32(val, qp->rq_db);
}

static void ocrdma_build_rqe(struct ocrdma_hdr_wqe *rqe,
                             const struct ib_recv_wr *wr, u16 tag)
{
        u32 wqe_size = 0;
        struct ocrdma_sge *sge;
        if (wr->num_sge)
                wqe_size = (wr->num_sge * sizeof(*sge)) + sizeof(*rqe);
        else
                wqe_size = sizeof(*sge) + sizeof(*rqe);

        rqe->cw = ((wqe_size / OCRDMA_WQE_STRIDE) <<
                                OCRDMA_WQE_SIZE_SHIFT);
        rqe->cw |= (OCRDMA_FLAG_SIG << OCRDMA_WQE_FLAGS_SHIFT);
        rqe->cw |= (OCRDMA_TYPE_LKEY << OCRDMA_WQE_TYPE_SHIFT);
        rqe->total_len = 0;
        rqe->rsvd_tag = tag;
        sge = (struct ocrdma_sge *)(rqe + 1);
        ocrdma_build_sges(rqe, sge, wr->num_sge, wr->sg_list);
        ocrdma_cpu_to_le32(rqe, wqe_size);
}

int ocrdma_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
                     const struct ib_recv_wr **bad_wr)
{
        int status = 0;
        unsigned long flags;
        struct ocrdma_qp *qp = get_ocrdma_qp(ibqp);
        struct ocrdma_hdr_wqe *rqe;

        spin_lock_irqsave(&qp->q_lock, flags);
        if (qp->state == OCRDMA_QPS_RST || qp->state == OCRDMA_QPS_ERR) {
                spin_unlock_irqrestore(&qp->q_lock, flags);
                *bad_wr = wr;
                return -EINVAL;
        }
        while (wr) {
                if (ocrdma_hwq_free_cnt(&qp->rq) == 0 ||
                    wr->num_sge > qp->rq.max_sges) {
                        *bad_wr = wr;
                        status = -ENOMEM;
                        break;
                }
                rqe = ocrdma_hwq_head(&qp->rq);
                ocrdma_build_rqe(rqe, wr, 0);

                qp->rqe_wr_id_tbl[qp->rq.head] = wr->wr_id;
                /* make sure rqe is written before adapter can access it */
                wmb();

                /* inform hw to start processing it */
                ocrdma_ring_rq_db(qp);

                /* update pointer, counter for next wr */
                ocrdma_hwq_inc_head(&qp->rq);
                wr = wr->next;
        }
        spin_unlock_irqrestore(&qp->q_lock, flags);
        return status;
}

/* cqe for srq's rqe can potentially arrive out of order.
 * index gives the entry in the shadow table where to store
 * the wr_id. tag/index is returned in cqe to reference back
 * for a given rqe.
 */
static int ocrdma_srq_get_idx(struct ocrdma_srq *srq)
{
        int row = 0;
        int indx = 0;

        for (row = 0; row < srq->bit_fields_len; row++) {
                if (srq->idx_bit_fields[row]) {
                        indx = ffs(srq->idx_bit_fields[row]);
                        indx = (row * 32) + (indx - 1);
                        BUG_ON(indx >= srq->rq.max_cnt);
                        ocrdma_srq_toggle_bit(srq, indx);
                        break;
                }
        }

        BUG_ON(row == srq->bit_fields_len);
        return indx + 1; /* Use from index 1 */
}

static void ocrdma_ring_srq_db(struct ocrdma_srq *srq)
{
        u32 val = srq->rq.dbid | (1 << 16);

        iowrite32(val, srq->db + OCRDMA_DB_GEN2_SRQ_OFFSET);
}

int ocrdma_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
                         const struct ib_recv_wr **bad_wr)
{
        int status = 0;
        unsigned long flags;
        struct ocrdma_srq *srq;
        struct ocrdma_hdr_wqe *rqe;
        u16 tag;

        srq = get_ocrdma_srq(ibsrq);

        spin_lock_irqsave(&srq->q_lock, flags);
        while (wr) {
                if (ocrdma_hwq_free_cnt(&srq->rq) == 0 ||
                    wr->num_sge > srq->rq.max_sges) {
                        status = -ENOMEM;
                        *bad_wr = wr;
                        break;
                }
                tag = ocrdma_srq_get_idx(srq);
                rqe = ocrdma_hwq_head(&srq->rq);
                ocrdma_build_rqe(rqe, wr, tag);

                srq->rqe_wr_id_tbl[tag] = wr->wr_id;
                /* make sure rqe is written before adapter can perform DMA */
                wmb();
                /* inform hw to start processing it */
                ocrdma_ring_srq_db(srq);
                /* update pointer, counter for next wr */
                ocrdma_hwq_inc_head(&srq->rq);
                wr = wr->next;
        }
        spin_unlock_irqrestore(&srq->q_lock, flags);
        return status;
}

static enum ib_wc_status ocrdma_to_ibwc_err(u16 status)
{
        enum ib_wc_status ibwc_status;

        switch (status) {
        case OCRDMA_CQE_GENERAL_ERR:
                ibwc_status = IB_WC_GENERAL_ERR;
                break;
        case OCRDMA_CQE_LOC_LEN_ERR:
                ibwc_status = IB_WC_LOC_LEN_ERR;
                break;
        case OCRDMA_CQE_LOC_QP_OP_ERR:
                ibwc_status = IB_WC_LOC_QP_OP_ERR;
                break;
        case OCRDMA_CQE_LOC_EEC_OP_ERR:
                ibwc_status = IB_WC_LOC_EEC_OP_ERR;
                break;
        case OCRDMA_CQE_LOC_PROT_ERR:
                ibwc_status = IB_WC_LOC_PROT_ERR;
                break;
        case OCRDMA_CQE_WR_FLUSH_ERR:
                ibwc_status = IB_WC_WR_FLUSH_ERR;
                break;
        case OCRDMA_CQE_MW_BIND_ERR:
                ibwc_status = IB_WC_MW_BIND_ERR;
                break;
        case OCRDMA_CQE_BAD_RESP_ERR:
                ibwc_status = IB_WC_BAD_RESP_ERR;
                break;
        case OCRDMA_CQE_LOC_ACCESS_ERR:
                ibwc_status = IB_WC_LOC_ACCESS_ERR;
                break;
        case OCRDMA_CQE_REM_INV_REQ_ERR:
                ibwc_status = IB_WC_REM_INV_REQ_ERR;
                break;
        case OCRDMA_CQE_REM_ACCESS_ERR:
                ibwc_status = IB_WC_REM_ACCESS_ERR;
                break;
        case OCRDMA_CQE_REM_OP_ERR:
                ibwc_status = IB_WC_REM_OP_ERR;
                break;
        case OCRDMA_CQE_RETRY_EXC_ERR:
                ibwc_status = IB_WC_RETRY_EXC_ERR;
                break;
        case OCRDMA_CQE_RNR_RETRY_EXC_ERR:
                ibwc_status = IB_WC_RNR_RETRY_EXC_ERR;
                break;
        case OCRDMA_CQE_LOC_RDD_VIOL_ERR:
                ibwc_status = IB_WC_LOC_RDD_VIOL_ERR;
                break;
        case OCRDMA_CQE_REM_INV_RD_REQ_ERR:
                ibwc_status = IB_WC_REM_INV_RD_REQ_ERR;
                break;
        case OCRDMA_CQE_REM_ABORT_ERR:
                ibwc_status = IB_WC_REM_ABORT_ERR;
                break;
        case OCRDMA_CQE_INV_EECN_ERR:
                ibwc_status = IB_WC_INV_EECN_ERR;
                break;
        case OCRDMA_CQE_INV_EEC_STATE_ERR:
                ibwc_status = IB_WC_INV_EEC_STATE_ERR;
                break;
        case OCRDMA_CQE_FATAL_ERR:
                ibwc_status = IB_WC_FATAL_ERR;
                break;
        case OCRDMA_CQE_RESP_TIMEOUT_ERR:
                ibwc_status = IB_WC_RESP_TIMEOUT_ERR;
                break;
        default:
                ibwc_status = IB_WC_GENERAL_ERR;
                break;
        }
        return ibwc_status;
}

static void ocrdma_update_wc(struct ocrdma_qp *qp, struct ib_wc *ibwc,
                      u32 wqe_idx)
{
        struct ocrdma_hdr_wqe *hdr;
        struct ocrdma_sge *rw;
        int opcode;

        hdr = ocrdma_hwq_head_from_idx(&qp->sq, wqe_idx);

        ibwc->wr_id = qp->wqe_wr_id_tbl[wqe_idx].wrid;
        /* Undo the hdr->cw swap */
        opcode = le32_to_cpu(hdr->cw) & OCRDMA_WQE_OPCODE_MASK;
        switch (opcode) {
        case OCRDMA_WRITE:
                ibwc->opcode = IB_WC_RDMA_WRITE;
                break;
        case OCRDMA_READ:
                rw = (struct ocrdma_sge *)(hdr + 1);
                ibwc->opcode = IB_WC_RDMA_READ;
                ibwc->byte_len = rw->len;
                break;
        case OCRDMA_SEND:
                ibwc->opcode = IB_WC_SEND;
                break;
        case OCRDMA_FR_MR:
                ibwc->opcode = IB_WC_REG_MR;
                break;
        case OCRDMA_LKEY_INV:
                ibwc->opcode = IB_WC_LOCAL_INV;
                break;
        default:
                ibwc->status = IB_WC_GENERAL_ERR;
                pr_err("%s() invalid opcode received = 0x%x\n",
                       __func__, hdr->cw & OCRDMA_WQE_OPCODE_MASK);
                break;
        }
}

static void ocrdma_set_cqe_status_flushed(struct ocrdma_qp *qp,
                                                struct ocrdma_cqe *cqe)
{
        if (is_cqe_for_sq(cqe)) {
                cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                cqe->flags_status_srcqpn) &
                                        ~OCRDMA_CQE_STATUS_MASK);
                cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                cqe->flags_status_srcqpn) |
                                (OCRDMA_CQE_WR_FLUSH_ERR <<
                                        OCRDMA_CQE_STATUS_SHIFT));
        } else {
                if (qp->qp_type == IB_QPT_UD || qp->qp_type == IB_QPT_GSI) {
                        cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                        cqe->flags_status_srcqpn) &
                                                ~OCRDMA_CQE_UD_STATUS_MASK);
                        cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                        cqe->flags_status_srcqpn) |
                                        (OCRDMA_CQE_WR_FLUSH_ERR <<
                                                OCRDMA_CQE_UD_STATUS_SHIFT));
                } else {
                        cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                        cqe->flags_status_srcqpn) &
                                                ~OCRDMA_CQE_STATUS_MASK);
                        cqe->flags_status_srcqpn = cpu_to_le32(le32_to_cpu(
                                        cqe->flags_status_srcqpn) |
                                        (OCRDMA_CQE_WR_FLUSH_ERR <<
                                                OCRDMA_CQE_STATUS_SHIFT));
                }
        }
}

static bool ocrdma_update_err_cqe(struct ib_wc *ibwc, struct ocrdma_cqe *cqe,
                                  struct ocrdma_qp *qp, int status)
{
        bool expand = false;

        ibwc->byte_len = 0;
        ibwc->qp = &qp->ibqp;
        ibwc->status = ocrdma_to_ibwc_err(status);

        ocrdma_flush_qp(qp);
        ocrdma_qp_state_change(qp, IB_QPS_ERR, NULL);

        /* if wqe/rqe pending for which cqe needs to be returned,
         * trigger inflating it.
         */
        if (!is_hw_rq_empty(qp) || !is_hw_sq_empty(qp)) {
                expand = true;
                ocrdma_set_cqe_status_flushed(qp, cqe);
        }
        return expand;
}

static int ocrdma_update_err_rcqe(struct ib_wc *ibwc, struct ocrdma_cqe *cqe,
                                  struct ocrdma_qp *qp, int status)
{
        ibwc->opcode = IB_WC_RECV;
        ibwc->wr_id = qp->rqe_wr_id_tbl[qp->rq.tail];
        ocrdma_hwq_inc_tail(&qp->rq);

        return ocrdma_update_err_cqe(ibwc, cqe, qp, status);
}

static int ocrdma_update_err_scqe(struct ib_wc *ibwc, struct ocrdma_cqe *cqe,
                                  struct ocrdma_qp *qp, int status)
{
        ocrdma_update_wc(qp, ibwc, qp->sq.tail);
        ocrdma_hwq_inc_tail(&qp->sq);

        return ocrdma_update_err_cqe(ibwc, cqe, qp, status);
}


static bool ocrdma_poll_err_scqe(struct ocrdma_qp *qp,
                                 struct ocrdma_cqe *cqe, struct ib_wc *ibwc,
                                 bool *polled, bool *stop)
{
        bool expand;
        struct ocrdma_dev *dev = get_ocrdma_dev(qp->ibqp.device);
        int status = (le32_to_cpu(cqe->flags_status_srcqpn) &
                OCRDMA_CQE_STATUS_MASK) >> OCRDMA_CQE_STATUS_SHIFT;
        if (status < OCRDMA_MAX_CQE_ERR)
                atomic_inc(&dev->cqe_err_stats[status]);

        /* when hw sq is empty, but rq is not empty, so we continue
         * to keep the cqe in order to get the cq event again.
         */
        if (is_hw_sq_empty(qp) && !is_hw_rq_empty(qp)) {
                /* when cq for rq and sq is same, it is safe to return
                 * flush cqe for RQEs.
                 */
                if (!qp->srq && (qp->sq_cq == qp->rq_cq)) {
                        *polled = true;
                        status = OCRDMA_CQE_WR_FLUSH_ERR;
                        expand = ocrdma_update_err_rcqe(ibwc, cqe, qp, status);
                } else {
                        /* stop processing further cqe as this cqe is used for
                         * triggering cq event on buddy cq of RQ.
                         * When QP is destroyed, this cqe will be removed
                         * from the cq's hardware q.
                         */
                        *polled = false;
                        *stop = true;
                        expand = false;
                }
        } else if (is_hw_sq_empty(qp)) {
                /* Do nothing */
                expand = false;
                *polled = false;
                *stop = false;
        } else {
                *polled = true;
                expand = ocrdma_update_err_scqe(ibwc, cqe, qp, status);
        }
        return expand;
}

static bool ocrdma_poll_success_scqe(struct ocrdma_qp *qp,
                                     struct ocrdma_cqe *cqe,
                                     struct ib_wc *ibwc, bool *polled)
{
        bool expand = false;
        int tail = qp->sq.tail;
        u32 wqe_idx;

        if (!qp->wqe_wr_id_tbl[tail].signaled) {
                *polled = false;    /* WC cannot be consumed yet */
        } else {
                ibwc->status = IB_WC_SUCCESS;
                ibwc->wc_flags = 0;
                ibwc->qp = &qp->ibqp;
                ocrdma_update_wc(qp, ibwc, tail);
                *polled = true;
        }
        wqe_idx = (le32_to_cpu(cqe->wq.wqeidx) &
                        OCRDMA_CQE_WQEIDX_MASK) & qp->sq.max_wqe_idx;
        if (tail != wqe_idx)
                expand = true; /* Coalesced CQE can't be consumed yet */

        ocrdma_hwq_inc_tail(&qp->sq);
        return expand;
}

static bool ocrdma_poll_scqe(struct ocrdma_qp *qp, struct ocrdma_cqe *cqe,
                             struct ib_wc *ibwc, bool *polled, bool *stop)
{
        int status;
        bool expand;

        status = (le32_to_cpu(cqe->flags_status_srcqpn) &
                OCRDMA_CQE_STATUS_MASK) >> OCRDMA_CQE_STATUS_SHIFT;

        if (status == OCRDMA_CQE_SUCCESS)
                expand = ocrdma_poll_success_scqe(qp, cqe, ibwc, polled);
        else
                expand = ocrdma_poll_err_scqe(qp, cqe, ibwc, polled, stop);
        return expand;
}

static int ocrdma_update_ud_rcqe(struct ocrdma_dev *dev, struct ib_wc *ibwc,
                                 struct ocrdma_cqe *cqe)
{
        int status;
        u16 hdr_type = 0;

        status = (le32_to_cpu(cqe->flags_status_srcqpn) &
                OCRDMA_CQE_UD_STATUS_MASK) >> OCRDMA_CQE_UD_STATUS_SHIFT;
        ibwc->src_qp = le32_to_cpu(cqe->flags_status_srcqpn) &
                                                OCRDMA_CQE_SRCQP_MASK;
        ibwc->pkey_index = 0;
        ibwc->wc_flags = IB_WC_GRH;
        ibwc->byte_len = (le32_to_cpu(cqe->ud.rxlen_pkey) >>
                          OCRDMA_CQE_UD_XFER_LEN_SHIFT) &
                          OCRDMA_CQE_UD_XFER_LEN_MASK;

        if (ocrdma_is_udp_encap_supported(dev)) {
                hdr_type = (le32_to_cpu(cqe->ud.rxlen_pkey) >>
                            OCRDMA_CQE_UD_L3TYPE_SHIFT) &
                            OCRDMA_CQE_UD_L3TYPE_MASK;
                ibwc->wc_flags |= IB_WC_WITH_NETWORK_HDR_TYPE;
                ibwc->network_hdr_type = hdr_type;
        }

        return status;
}

static void ocrdma_update_free_srq_cqe(struct ib_wc *ibwc,
                                       struct ocrdma_cqe *cqe,
                                       struct ocrdma_qp *qp)
{
        unsigned long flags;
        struct ocrdma_srq *srq;
        u32 wqe_idx;

        srq = get_ocrdma_srq(qp->ibqp.srq);
        wqe_idx = (le32_to_cpu(cqe->rq.buftag_qpn) >>
                OCRDMA_CQE_BUFTAG_SHIFT) & srq->rq.max_wqe_idx;
        BUG_ON(wqe_idx < 1);

        ibwc->wr_id = srq->rqe_wr_id_tbl[wqe_idx];
        spin_lock_irqsave(&srq->q_lock, flags);
        ocrdma_srq_toggle_bit(srq, wqe_idx - 1);
        spin_unlock_irqrestore(&srq->q_lock, flags);
        ocrdma_hwq_inc_tail(&srq->rq);
}

static bool ocrdma_poll_err_rcqe(struct ocrdma_qp *qp, struct ocrdma_cqe *cqe,
                                struct ib_wc *ibwc, bool *polled, bool *stop,
                                int status)
{
        bool expand;
        struct ocrdma_dev *dev = get_ocrdma_dev(qp->ibqp.device);

        if (status < OCRDMA_MAX_CQE_ERR)
                atomic_inc(&dev->cqe_err_stats[status]);

        /* when hw_rq is empty, but wq is not empty, so continue
         * to keep the cqe to get the cq event again.
         */
        if (is_hw_rq_empty(qp) && !is_hw_sq_empty(qp)) {
                if (!qp->srq && (qp->sq_cq == qp->rq_cq)) {
                        *polled = true;
                        status = OCRDMA_CQE_WR_FLUSH_ERR;
                        expand = ocrdma_update_err_scqe(ibwc, cqe, qp, status);
                } else {
                        *polled = false;
                        *stop = true;
                        expand = false;
                }
        } else if (is_hw_rq_empty(qp)) {
                /* Do nothing */
                expand = false;
                *polled = false;
                *stop = false;
        } else {
                *polled = true;
                expand = ocrdma_update_err_rcqe(ibwc, cqe, qp, status);
        }
        return expand;
}

static void ocrdma_poll_success_rcqe(struct ocrdma_qp *qp,
                                     struct ocrdma_cqe *cqe, struct ib_wc *ibwc)
{
        struct ocrdma_dev *dev;

        dev = get_ocrdma_dev(qp->ibqp.device);
        ibwc->opcode = IB_WC_RECV;
        ibwc->qp = &qp->ibqp;
        ibwc->status = IB_WC_SUCCESS;

        if (qp->qp_type == IB_QPT_UD || qp->qp_type == IB_QPT_GSI)
                ocrdma_update_ud_rcqe(dev, ibwc, cqe);
        else
                ibwc->byte_len = le32_to_cpu(cqe->rq.rxlen);

        if (is_cqe_imm(cqe)) {
                ibwc->ex.imm_data = htonl(le32_to_cpu(cqe->rq.lkey_immdt));
                ibwc->wc_flags |= IB_WC_WITH_IMM;
        } else if (is_cqe_wr_imm(cqe)) {
                ibwc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
                ibwc->ex.imm_data = htonl(le32_to_cpu(cqe->rq.lkey_immdt));
                ibwc->wc_flags |= IB_WC_WITH_IMM;
        } else if (is_cqe_invalidated(cqe)) {
                ibwc->ex.invalidate_rkey = le32_to_cpu(cqe->rq.lkey_immdt);
                ibwc->wc_flags |= IB_WC_WITH_INVALIDATE;
        }
        if (qp->ibqp.srq) {
                ocrdma_update_free_srq_cqe(ibwc, cqe, qp);
        } else {
                ibwc->wr_id = qp->rqe_wr_id_tbl[qp->rq.tail];
                ocrdma_hwq_inc_tail(&qp->rq);
        }
}

static bool ocrdma_poll_rcqe(struct ocrdma_qp *qp, struct ocrdma_cqe *cqe,
                             struct ib_wc *ibwc, bool *polled, bool *stop)
{
        int status;
        bool expand = false;

        ibwc->wc_flags = 0;
        if (qp->qp_type == IB_QPT_UD || qp->qp_type == IB_QPT_GSI) {
                status = (le32_to_cpu(cqe->flags_status_srcqpn) &
                                        OCRDMA_CQE_UD_STATUS_MASK) >>
                                        OCRDMA_CQE_UD_STATUS_SHIFT;
        } else {
                status = (le32_to_cpu(cqe->flags_status_srcqpn) &
                             OCRDMA_CQE_STATUS_MASK) >> OCRDMA_CQE_STATUS_SHIFT;
        }

        if (status == OCRDMA_CQE_SUCCESS) {
                *polled = true;
                ocrdma_poll_success_rcqe(qp, cqe, ibwc);
        } else {
                expand = ocrdma_poll_err_rcqe(qp, cqe, ibwc, polled, stop,
                                              status);
        }
        return expand;
}

static void ocrdma_change_cq_phase(struct ocrdma_cq *cq, struct ocrdma_cqe *cqe,
                                   u16 cur_getp)
{
        if (cq->phase_change) {
                if (cur_getp == 0)
                        cq->phase = (~cq->phase & OCRDMA_CQE_VALID);
        } else {
                /* clear valid bit */
                cqe->flags_status_srcqpn = 0;
        }
}

static int ocrdma_poll_hwcq(struct ocrdma_cq *cq, int num_entries,
                            struct ib_wc *ibwc)
{
        u16 qpn = 0;
        int i = 0;
        bool expand = false;
        int polled_hw_cqes = 0;
        struct ocrdma_qp *qp = NULL;
        struct ocrdma_dev *dev = get_ocrdma_dev(cq->ibcq.device);
        struct ocrdma_cqe *cqe;
        u16 cur_getp; bool polled = false; bool stop = false;

        cur_getp = cq->getp;
        while (num_entries) {
                cqe = cq->va + cur_getp;
                /* check whether valid cqe or not */
                if (!is_cqe_valid(cq, cqe))
                        break;
                qpn = (le32_to_cpu(cqe->cmn.qpn) & OCRDMA_CQE_QPN_MASK);
                /* ignore discarded cqe */
                if (qpn == 0)
                        goto skip_cqe;
                qp = dev->qp_tbl[qpn];
                BUG_ON(qp == NULL);

                if (is_cqe_for_sq(cqe)) {
                        expand = ocrdma_poll_scqe(qp, cqe, ibwc, &polled,
                                                  &stop);
                } else {
                        expand = ocrdma_poll_rcqe(qp, cqe, ibwc, &polled,
                                                  &stop);
                }
                if (expand)
                        goto expand_cqe;
                if (stop)
                        goto stop_cqe;
                /* clear qpn to avoid duplicate processing by discard_cqe() */
                cqe->cmn.qpn = 0;
skip_cqe:
                polled_hw_cqes += 1;
                cur_getp = (cur_getp + 1) % cq->max_hw_cqe;
                ocrdma_change_cq_phase(cq, cqe, cur_getp);
expand_cqe:
                if (polled) {
                        num_entries -= 1;
                        i += 1;
                        ibwc = ibwc + 1;
                        polled = false;
                }
        }
stop_cqe:
        cq->getp = cur_getp;

        if (polled_hw_cqes)
                ocrdma_ring_cq_db(dev, cq->id, false, false, polled_hw_cqes);

        return i;
}

/* insert error cqe if the QP's SQ or RQ's CQ matches the CQ under poll. */
static int ocrdma_add_err_cqe(struct ocrdma_cq *cq, int num_entries,
                              struct ocrdma_qp *qp, struct ib_wc *ibwc)
{
        int err_cqes = 0;

        while (num_entries) {
                if (is_hw_sq_empty(qp) && is_hw_rq_empty(qp))
                        break;
                if (!is_hw_sq_empty(qp) && qp->sq_cq == cq) {
                        ocrdma_update_wc(qp, ibwc, qp->sq.tail);
                        ocrdma_hwq_inc_tail(&qp->sq);
                } else if (!is_hw_rq_empty(qp) && qp->rq_cq == cq) {
                        ibwc->wr_id = qp->rqe_wr_id_tbl[qp->rq.tail];
                        ocrdma_hwq_inc_tail(&qp->rq);
                } else {
                        return err_cqes;
                }
                ibwc->byte_len = 0;
                ibwc->status = IB_WC_WR_FLUSH_ERR;
                ibwc = ibwc + 1;
                err_cqes += 1;
                num_entries -= 1;
        }
        return err_cqes;
}

int ocrdma_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
{
        int cqes_to_poll = num_entries;
        struct ocrdma_cq *cq = get_ocrdma_cq(ibcq);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibcq->device);
        int num_os_cqe = 0, err_cqes = 0;
        struct ocrdma_qp *qp;
        unsigned long flags;

        /* poll cqes from adapter CQ */
        spin_lock_irqsave(&cq->cq_lock, flags);
        num_os_cqe = ocrdma_poll_hwcq(cq, cqes_to_poll, wc);
        spin_unlock_irqrestore(&cq->cq_lock, flags);
        cqes_to_poll -= num_os_cqe;

        if (cqes_to_poll) {
                wc = wc + num_os_cqe;
                /* adapter returns single error cqe when qp moves to
                 * error state. So insert error cqes with wc_status as
                 * FLUSHED for pending WQEs and RQEs of QP's SQ and RQ
                 * respectively which uses this CQ.
                 */
                spin_lock_irqsave(&dev->flush_q_lock, flags);
                list_for_each_entry(qp, &cq->sq_head, sq_entry) {
                        if (cqes_to_poll == 0)
                                break;
                        err_cqes = ocrdma_add_err_cqe(cq, cqes_to_poll, qp, wc);
                        cqes_to_poll -= err_cqes;
                        num_os_cqe += err_cqes;
                        wc = wc + err_cqes;
                }
                spin_unlock_irqrestore(&dev->flush_q_lock, flags);
        }
        return num_os_cqe;
}

int ocrdma_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags cq_flags)
{
        struct ocrdma_cq *cq = get_ocrdma_cq(ibcq);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibcq->device);
        u16 cq_id;
        unsigned long flags;
        bool arm_needed = false, sol_needed = false;

        cq_id = cq->id;

        spin_lock_irqsave(&cq->cq_lock, flags);
        if (cq_flags & IB_CQ_NEXT_COMP || cq_flags & IB_CQ_SOLICITED)
                arm_needed = true;
        if (cq_flags & IB_CQ_SOLICITED)
                sol_needed = true;

        ocrdma_ring_cq_db(dev, cq_id, arm_needed, sol_needed, 0);
        spin_unlock_irqrestore(&cq->cq_lock, flags);

        return 0;
}

struct ib_mr *ocrdma_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
                              u32 max_num_sg, struct ib_udata *udata)
{
        int status;
        struct ocrdma_mr *mr;
        struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
        struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);

        if (mr_type != IB_MR_TYPE_MEM_REG)
                return ERR_PTR(-EINVAL);

        if (max_num_sg > dev->attr.max_pages_per_frmr)
                return ERR_PTR(-EINVAL);

        mr = kzalloc(sizeof(*mr), GFP_KERNEL);
        if (!mr)
                return ERR_PTR(-ENOMEM);

        mr->pages = kcalloc(max_num_sg, sizeof(u64), GFP_KERNEL);
        if (!mr->pages) {
                status = -ENOMEM;
                goto pl_err;
        }

        status = ocrdma_get_pbl_info(dev, mr, max_num_sg);
        if (status)
                goto pbl_err;
        mr->hwmr.fr_mr = 1;
        mr->hwmr.remote_rd = 0;
        mr->hwmr.remote_wr = 0;
        mr->hwmr.local_rd = 0;
        mr->hwmr.local_wr = 0;
        mr->hwmr.mw_bind = 0;
        status = ocrdma_build_pbl_tbl(dev, &mr->hwmr);
        if (status)
                goto pbl_err;
        status = ocrdma_reg_mr(dev, &mr->hwmr, pd->id, 0);
        if (status)
                goto mbx_err;
        mr->ibmr.rkey = mr->hwmr.lkey;
        mr->ibmr.lkey = mr->hwmr.lkey;
        dev->stag_arr[(mr->hwmr.lkey >> 8) & (OCRDMA_MAX_STAG - 1)] =
                (unsigned long) mr;
        return &mr->ibmr;
mbx_err:
        ocrdma_free_mr_pbl_tbl(dev, &mr->hwmr);
pbl_err:
        kfree(mr->pages);
pl_err:
        kfree(mr);
        return ERR_PTR(-ENOMEM);
}

static int ocrdma_set_page(struct ib_mr *ibmr, u64 addr)
{
        struct ocrdma_mr *mr = get_ocrdma_mr(ibmr);

        if (unlikely(mr->npages == mr->hwmr.num_pbes))
                return -ENOMEM;

        mr->pages[mr->npages++] = addr;

        return 0;
}

int ocrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
                     unsigned int *sg_offset)
{
        struct ocrdma_mr *mr = get_ocrdma_mr(ibmr);

        mr->npages = 0;

        return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, ocrdma_set_page);
}