iwch_provider.c

Go to the documentation of this file.

/*
 * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/inetdevice.h>
#include <linux/slab.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>

#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_user_verbs.h>

#include "cxio_hal.h"
#include "iwch.h"
#include "iwch_provider.h"
#include "iwch_cm.h"
#include "iwch_user.h"
#include "common.h"

static struct ib_ah *iwch_ah_create(struct ib_pd *pd,
                    struct ib_ah_attr *ah_attr)
{
    return ERR_PTR(-ENOSYS);
}

static int iwch_ah_destroy(struct ib_ah *ah)
{
    return -ENOSYS;
}

static int iwch_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
    return -ENOSYS;
}

static int iwch_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
    return -ENOSYS;
}

static int iwch_process_mad(struct ib_device *ibdev,
                int mad_flags,
                u8 port_num,
                struct ib_wc *in_wc,
                struct ib_grh *in_grh,
                struct ib_mad *in_mad, struct ib_mad *out_mad)
{
    return -ENOSYS;
}

static int iwch_dealloc_ucontext(struct ib_ucontext *context)
{
    struct iwch_dev *rhp = to_iwch_dev(context->device);
    struct iwch_ucontext *ucontext = to_iwch_ucontext(context);
    struct iwch_mm_entry *mm, *tmp;

    PDBG("%s context %p\n", __func__, context);
    list_for_each_entry_safe(mm, tmp, &ucontext->mmaps, entry)
        kfree(mm);
    cxio_release_ucontext(&rhp->rdev, &ucontext->uctx);
    kfree(ucontext);
    return 0;
}

static struct ib_ucontext *iwch_alloc_ucontext(struct ib_device *ibdev,
                    struct ib_udata *udata)
{
    struct iwch_ucontext *context;
    struct iwch_dev *rhp = to_iwch_dev(ibdev);

    PDBG("%s ibdev %p\n", __func__, ibdev);
    context = kzalloc(sizeof(*context), GFP_KERNEL);
    if (!context)
        return ERR_PTR(-ENOMEM);
    cxio_init_ucontext(&rhp->rdev, &context->uctx);
    INIT_LIST_HEAD(&context->mmaps);
    spin_lock_init(&context->mmap_lock);
    return &context->ibucontext;
}

static int iwch_destroy_cq(struct ib_cq *ib_cq)
{
    struct iwch_cq *chp;

    PDBG("%s ib_cq %p\n", __func__, ib_cq);
    chp = to_iwch_cq(ib_cq);

    remove_handle(chp->rhp, &chp->rhp->cqidr, chp->cq.cqid);
    atomic_dec(&chp->refcnt);
    wait_event(chp->wait, !atomic_read(&chp->refcnt));

    cxio_destroy_cq(&chp->rhp->rdev, &chp->cq);
    kfree(chp);
    return 0;
}

static struct ib_cq *iwch_create_cq(struct ib_device *ibdev, int entries, int vector,
                 struct ib_ucontext *ib_context,
                 struct ib_udata *udata)
{
    struct iwch_dev *rhp;
    struct iwch_cq *chp;
    struct iwch_create_cq_resp uresp;
    struct iwch_create_cq_req ureq;
    struct iwch_ucontext *ucontext = NULL;
    static int warned;
    size_t resplen;

    PDBG("%s ib_dev %p entries %d\n", __func__, ibdev, entries);
    rhp = to_iwch_dev(ibdev);
    chp = kzalloc(sizeof(*chp), GFP_KERNEL);
    if (!chp)
        return ERR_PTR(-ENOMEM);

    if (ib_context) {
        ucontext = to_iwch_ucontext(ib_context);
        if (!t3a_device(rhp)) {
            if (ib_copy_from_udata(&ureq, udata, sizeof (ureq))) {
                kfree(chp);
                return ERR_PTR(-EFAULT);
            }
            chp->user_rptr_addr = (u32 __user *)(unsigned long)ureq.user_rptr_addr;
        }
    }

    if (t3a_device(rhp)) {

        /*
         * T3A: Add some fluff to handle extra CQEs inserted
         * for various errors.
         * Additional CQE possibilities:
         *      TERMINATE,
         *      incoming RDMA WRITE Failures
         *      incoming RDMA READ REQUEST FAILUREs
         * NOTE: We cannot ensure the CQ won't overflow.
         */
        entries += 16;
    }
    entries = roundup_pow_of_two(entries);
    chp->cq.size_log2 = ilog2(entries);

    if (cxio_create_cq(&rhp->rdev, &chp->cq, !ucontext)) {
        kfree(chp);
        return ERR_PTR(-ENOMEM);
    }
    chp->rhp = rhp;
    chp->ibcq.cqe = 1 << chp->cq.size_log2;
    spin_lock_init(&chp->lock);
    spin_lock_init(&chp->comp_handler_lock);
    atomic_set(&chp->refcnt, 1);
    init_waitqueue_head(&chp->wait);
    if (insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid)) {
        cxio_destroy_cq(&chp->rhp->rdev, &chp->cq);
        kfree(chp);
        return ERR_PTR(-ENOMEM);
    }

    if (ucontext) {
        struct iwch_mm_entry *mm;

        mm = kmalloc(sizeof *mm, GFP_KERNEL);
        if (!mm) {
            iwch_destroy_cq(&chp->ibcq);
            return ERR_PTR(-ENOMEM);
        }
        uresp.cqid = chp->cq.cqid;
        uresp.size_log2 = chp->cq.size_log2;
        spin_lock(&ucontext->mmap_lock);
        uresp.key = ucontext->key;
        ucontext->key += PAGE_SIZE;
        spin_unlock(&ucontext->mmap_lock);
        mm->key = uresp.key;
        mm->addr = virt_to_phys(chp->cq.queue);
        if (udata->outlen < sizeof uresp) {
            if (!warned++)
                printk(KERN_WARNING MOD "Warning - "
                       "downlevel libcxgb3 (non-fatal).\n");
            mm->len = PAGE_ALIGN((1UL << uresp.size_log2) *
                         sizeof(struct t3_cqe));
            resplen = sizeof(struct iwch_create_cq_resp_v0);
        } else {
            mm->len = PAGE_ALIGN(((1UL << uresp.size_log2) + 1) *
                         sizeof(struct t3_cqe));
            uresp.memsize = mm->len;
            resplen = sizeof uresp;
        }
        if (ib_copy_to_udata(udata, &uresp, resplen)) {
            kfree(mm);
            iwch_destroy_cq(&chp->ibcq);
            return ERR_PTR(-EFAULT);
        }
        insert_mmap(ucontext, mm);
    }
    PDBG("created cqid 0x%0x chp %p size 0x%0x, dma_addr 0x%0llx\n",
         chp->cq.cqid, chp, (1 << chp->cq.size_log2),
         (unsigned long long) chp->cq.dma_addr);
    return &chp->ibcq;
}

static int iwch_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
{
#ifdef notyet
    struct iwch_cq *chp = to_iwch_cq(cq);
    struct t3_cq oldcq, newcq;
    int ret;

    PDBG("%s ib_cq %p cqe %d\n", __func__, cq, cqe);

    /* We don't downsize... */
    if (cqe <= cq->cqe)
        return 0;

    /* create new t3_cq with new size */
    cqe = roundup_pow_of_two(cqe+1);
    newcq.size_log2 = ilog2(cqe);

    /* Dont allow resize to less than the current wce count */
    if (cqe < Q_COUNT(chp->cq.rptr, chp->cq.wptr)) {
        return -ENOMEM;
    }

    /* Quiesce all QPs using this CQ */
    ret = iwch_quiesce_qps(chp);
    if (ret) {
        return ret;
    }

    ret = cxio_create_cq(&chp->rhp->rdev, &newcq);
    if (ret) {
        return ret;
    }

    /* copy CQEs */
    memcpy(newcq.queue, chp->cq.queue, (1 << chp->cq.size_log2) *
                        sizeof(struct t3_cqe));

    /* old iwch_qp gets new t3_cq but keeps old cqid */
    oldcq = chp->cq;
    chp->cq = newcq;
    chp->cq.cqid = oldcq.cqid;

    /* resize new t3_cq to update the HW context */
    ret = cxio_resize_cq(&chp->rhp->rdev, &chp->cq);
    if (ret) {
        chp->cq = oldcq;
        return ret;
    }
    chp->ibcq.cqe = (1<<chp->cq.size_log2) - 1;

    /* destroy old t3_cq */
    oldcq.cqid = newcq.cqid;
    ret = cxio_destroy_cq(&chp->rhp->rdev, &oldcq);
    if (ret) {
        printk(KERN_ERR MOD "%s - cxio_destroy_cq failed %d\n",
            __func__, ret);
    }

    /* add user hooks here */

    /* resume qps */
    ret = iwch_resume_qps(chp);
    return ret;
#else
    return -ENOSYS;
#endif
}

static int iwch_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
{
    struct iwch_dev *rhp;
    struct iwch_cq *chp;
    enum t3_cq_opcode cq_op;
    int err;
    unsigned long flag;
    u32 rptr;

    chp = to_iwch_cq(ibcq);
    rhp = chp->rhp;
    if ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
        cq_op = CQ_ARM_SE;
    else
        cq_op = CQ_ARM_AN;
    if (chp->user_rptr_addr) {
        if (get_user(rptr, chp->user_rptr_addr))
            return -EFAULT;
        spin_lock_irqsave(&chp->lock, flag);
        chp->cq.rptr = rptr;
    } else
        spin_lock_irqsave(&chp->lock, flag);
    PDBG("%s rptr 0x%x\n", __func__, chp->cq.rptr);
    err = cxio_hal_cq_op(&rhp->rdev, &chp->cq, cq_op, 0);
    spin_unlock_irqrestore(&chp->lock, flag);
    if (err < 0)
        printk(KERN_ERR MOD "Error %d rearming CQID 0x%x\n", err,
               chp->cq.cqid);
    if (err > 0 && !(flags & IB_CQ_REPORT_MISSED_EVENTS))
        err = 0;
    return err;
}

static int iwch_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
{
    int len = vma->vm_end - vma->vm_start;
    u32 key = vma->vm_pgoff << PAGE_SHIFT;
    struct cxio_rdev *rdev_p;
    int ret = 0;
    struct iwch_mm_entry *mm;
    struct iwch_ucontext *ucontext;
    u64 addr;

    PDBG("%s pgoff 0x%lx key 0x%x len %d\n", __func__, vma->vm_pgoff,
         key, len);

    if (vma->vm_start & (PAGE_SIZE-1)) {
            return -EINVAL;
    }

    rdev_p = &(to_iwch_dev(context->device)->rdev);
    ucontext = to_iwch_ucontext(context);

    mm = remove_mmap(ucontext, key, len);
    if (!mm)
        return -EINVAL;
    addr = mm->addr;
    kfree(mm);

    if ((addr >= rdev_p->rnic_info.udbell_physbase) &&
        (addr < (rdev_p->rnic_info.udbell_physbase +
               rdev_p->rnic_info.udbell_len))) {

        /*
         * Map T3 DB register.
         */
        if (vma->vm_flags & VM_READ) {
            return -EPERM;
        }

        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
        vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
        vma->vm_flags &= ~VM_MAYREAD;
        ret = io_remap_pfn_range(vma, vma->vm_start,
                     addr >> PAGE_SHIFT,
                         len, vma->vm_page_prot);
    } else {

        /*
         * Map WQ or CQ contig dma memory...
         */
        ret = remap_pfn_range(vma, vma->vm_start,
                      addr >> PAGE_SHIFT,
                      len, vma->vm_page_prot);
    }

    return ret;
}

static int iwch_deallocate_pd(struct ib_pd *pd)
{
    struct iwch_dev *rhp;
    struct iwch_pd *php;

    php = to_iwch_pd(pd);
    rhp = php->rhp;
    PDBG("%s ibpd %p pdid 0x%x\n", __func__, pd, php->pdid);
    cxio_hal_put_pdid(rhp->rdev.rscp, php->pdid);
    kfree(php);
    return 0;
}

static struct ib_pd *iwch_allocate_pd(struct ib_device *ibdev,
                   struct ib_ucontext *context,
                   struct ib_udata *udata)
{
    struct iwch_pd *php;
    u32 pdid;
    struct iwch_dev *rhp;

    PDBG("%s ibdev %p\n", __func__, ibdev);
    rhp = (struct iwch_dev *) ibdev;
    pdid = cxio_hal_get_pdid(rhp->rdev.rscp);
    if (!pdid)
        return ERR_PTR(-EINVAL);
    php = kzalloc(sizeof(*php), GFP_KERNEL);
    if (!php) {
        cxio_hal_put_pdid(rhp->rdev.rscp, pdid);
        return ERR_PTR(-ENOMEM);
    }
    php->pdid = pdid;
    php->rhp = rhp;
    if (context) {
        if (ib_copy_to_udata(udata, &php->pdid, sizeof (__u32))) {
            iwch_deallocate_pd(&php->ibpd);
            return ERR_PTR(-EFAULT);
        }
    }
    PDBG("%s pdid 0x%0x ptr 0x%p\n", __func__, pdid, php);
    return &php->ibpd;
}

static int iwch_dereg_mr(struct ib_mr *ib_mr)
{
    struct iwch_dev *rhp;
    struct iwch_mr *mhp;
    u32 mmid;

    PDBG("%s ib_mr %p\n", __func__, ib_mr);
    /* There can be no memory windows */
    if (atomic_read(&ib_mr->usecnt))
        return -EINVAL;

    mhp = to_iwch_mr(ib_mr);
    rhp = mhp->rhp;
    mmid = mhp->attr.stag >> 8;
    cxio_dereg_mem(&rhp->rdev, mhp->attr.stag, mhp->attr.pbl_size,
               mhp->attr.pbl_addr);
    iwch_free_pbl(mhp);
    remove_handle(rhp, &rhp->mmidr, mmid);
    if (mhp->kva)
        kfree((void *) (unsigned long) mhp->kva);
    if (mhp->umem)
        ib_umem_release(mhp->umem);
    PDBG("%s mmid 0x%x ptr %p\n", __func__, mmid, mhp);
    kfree(mhp);
    return 0;
}

static struct ib_mr *iwch_register_phys_mem(struct ib_pd *pd,
                    struct ib_phys_buf *buffer_list,
                    int num_phys_buf,
                    int acc,
                    u64 *iova_start)
{
    __be64 *page_list;
    int shift;
    u64 total_size;
    int npages;
    struct iwch_dev *rhp;
    struct iwch_pd *php;
    struct iwch_mr *mhp;
    int ret;

    PDBG("%s ib_pd %p\n", __func__, pd);
    php = to_iwch_pd(pd);
    rhp = php->rhp;

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

    mhp->rhp = rhp;

    /* First check that we have enough alignment */
    if ((*iova_start & ~PAGE_MASK) != (buffer_list[0].addr & ~PAGE_MASK)) {
        ret = -EINVAL;
        goto err;
    }

    if (num_phys_buf > 1 &&
        ((buffer_list[0].addr + buffer_list[0].size) & ~PAGE_MASK)) {
        ret = -EINVAL;
        goto err;
    }

    ret = build_phys_page_list(buffer_list, num_phys_buf, iova_start,
                   &total_size, &npages, &shift, &page_list);
    if (ret)
        goto err;

    ret = iwch_alloc_pbl(mhp, npages);
    if (ret) {
        kfree(page_list);
        goto err_pbl;
    }

    ret = iwch_write_pbl(mhp, page_list, npages, 0);
    kfree(page_list);
    if (ret)
        goto err_pbl;

    mhp->attr.pdid = php->pdid;
    mhp->attr.zbva = 0;

    mhp->attr.perms = iwch_ib_to_tpt_access(acc);
    mhp->attr.va_fbo = *iova_start;
    mhp->attr.page_size = shift - 12;

    mhp->attr.len = (u32) total_size;
    mhp->attr.pbl_size = npages;
    ret = iwch_register_mem(rhp, php, mhp, shift);
    if (ret)
        goto err_pbl;

    return &mhp->ibmr;

err_pbl:
    iwch_free_pbl(mhp);

err:
    kfree(mhp);
    return ERR_PTR(ret);

}

static int iwch_reregister_phys_mem(struct ib_mr *mr,
                     int mr_rereg_mask,
                     struct ib_pd *pd,
                                 struct ib_phys_buf *buffer_list,
                                 int num_phys_buf,
                                 int acc, u64 * iova_start)
{

    struct iwch_mr mh, *mhp;
    struct iwch_pd *php;
    struct iwch_dev *rhp;
    __be64 *page_list = NULL;
    int shift = 0;
    u64 total_size;
    int npages;
    int ret;

    PDBG("%s ib_mr %p ib_pd %p\n", __func__, mr, pd);

    /* There can be no memory windows */
    if (atomic_read(&mr->usecnt))
        return -EINVAL;

    mhp = to_iwch_mr(mr);
    rhp = mhp->rhp;
    php = to_iwch_pd(mr->pd);

    /* make sure we are on the same adapter */
    if (rhp != php->rhp)
        return -EINVAL;

    memcpy(&mh, mhp, sizeof *mhp);

    if (mr_rereg_mask & IB_MR_REREG_PD)
        php = to_iwch_pd(pd);
    if (mr_rereg_mask & IB_MR_REREG_ACCESS)
        mh.attr.perms = iwch_ib_to_tpt_access(acc);
    if (mr_rereg_mask & IB_MR_REREG_TRANS) {
        ret = build_phys_page_list(buffer_list, num_phys_buf,
                       iova_start,
                       &total_size, &npages,
                       &shift, &page_list);
        if (ret)
            return ret;
    }

    ret = iwch_reregister_mem(rhp, php, &mh, shift, npages);
    kfree(page_list);
    if (ret) {
        return ret;
    }
    if (mr_rereg_mask & IB_MR_REREG_PD)
        mhp->attr.pdid = php->pdid;
    if (mr_rereg_mask & IB_MR_REREG_ACCESS)
        mhp->attr.perms = iwch_ib_to_tpt_access(acc);
    if (mr_rereg_mask & IB_MR_REREG_TRANS) {
        mhp->attr.zbva = 0;
        mhp->attr.va_fbo = *iova_start;
        mhp->attr.page_size = shift - 12;
        mhp->attr.len = (u32) total_size;
        mhp->attr.pbl_size = npages;
    }

    return 0;
}


static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                      u64 virt, int acc, struct ib_udata *udata)
{
    __be64 *pages;
    int shift, n, len;
    int i, j, k;
    int err = 0;
    struct ib_umem_chunk *chunk;
    struct iwch_dev *rhp;
    struct iwch_pd *php;
    struct iwch_mr *mhp;
    struct iwch_reg_user_mr_resp uresp;

    PDBG("%s ib_pd %p\n", __func__, pd);

    php = to_iwch_pd(pd);
    rhp = php->rhp;
    mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
    if (!mhp)
        return ERR_PTR(-ENOMEM);

    mhp->rhp = rhp;

    mhp->umem = ib_umem_get(pd->uobject->context, start, length, acc, 0);
    if (IS_ERR(mhp->umem)) {
        err = PTR_ERR(mhp->umem);
        kfree(mhp);
        return ERR_PTR(err);
    }

    shift = ffs(mhp->umem->page_size) - 1;

    n = 0;
    list_for_each_entry(chunk, &mhp->umem->chunk_list, list)
        n += chunk->nents;

    err = iwch_alloc_pbl(mhp, n);
    if (err)
        goto err;

    pages = (__be64 *) __get_free_page(GFP_KERNEL);
    if (!pages) {
        err = -ENOMEM;
        goto err_pbl;
    }

    i = n = 0;

    list_for_each_entry(chunk, &mhp->umem->chunk_list, list)
        for (j = 0; j < chunk->nmap; ++j) {
            len = sg_dma_len(&chunk->page_list[j]) >> shift;
            for (k = 0; k < len; ++k) {
                pages[i++] = cpu_to_be64(sg_dma_address(
                    &chunk->page_list[j]) +
                    mhp->umem->page_size * k);
                if (i == PAGE_SIZE / sizeof *pages) {
                    err = iwch_write_pbl(mhp, pages, i, n);
                    if (err)
                        goto pbl_done;
                    n += i;
                    i = 0;
                }
            }
        }

    if (i)
        err = iwch_write_pbl(mhp, pages, i, n);

pbl_done:
    free_page((unsigned long) pages);
    if (err)
        goto err_pbl;

    mhp->attr.pdid = php->pdid;
    mhp->attr.zbva = 0;
    mhp->attr.perms = iwch_ib_to_tpt_access(acc);
    mhp->attr.va_fbo = virt;
    mhp->attr.page_size = shift - 12;
    mhp->attr.len = (u32) length;

    err = iwch_register_mem(rhp, php, mhp, shift);
    if (err)
        goto err_pbl;

    if (udata && !t3a_device(rhp)) {
        uresp.pbl_addr = (mhp->attr.pbl_addr -
                 rhp->rdev.rnic_info.pbl_base) >> 3;
        PDBG("%s user resp pbl_addr 0x%x\n", __func__,
             uresp.pbl_addr);

        if (ib_copy_to_udata(udata, &uresp, sizeof (uresp))) {
            iwch_dereg_mr(&mhp->ibmr);
            err = -EFAULT;
            goto err;
        }
    }

    return &mhp->ibmr;

err_pbl:
    iwch_free_pbl(mhp);

err:
    ib_umem_release(mhp->umem);
    kfree(mhp);
    return ERR_PTR(err);
}

static struct ib_mr *iwch_get_dma_mr(struct ib_pd *pd, int acc)
{
    struct ib_phys_buf bl;
    u64 kva;
    struct ib_mr *ibmr;

    PDBG("%s ib_pd %p\n", __func__, pd);

    /*
     * T3 only supports 32 bits of size.
     */
    bl.size = 0xffffffff;
    bl.addr = 0;
    kva = 0;
    ibmr = iwch_register_phys_mem(pd, &bl, 1, acc, &kva);
    return ibmr;
}

static struct ib_mw *iwch_alloc_mw(struct ib_pd *pd)
{
    struct iwch_dev *rhp;
    struct iwch_pd *php;
    struct iwch_mw *mhp;
    u32 mmid;
    u32 stag = 0;
    int ret;

    php = to_iwch_pd(pd);
    rhp = php->rhp;
    mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
    if (!mhp)
        return ERR_PTR(-ENOMEM);
    ret = cxio_allocate_window(&rhp->rdev, &stag, php->pdid);
    if (ret) {
        kfree(mhp);
        return ERR_PTR(ret);
    }
    mhp->rhp = rhp;
    mhp->attr.pdid = php->pdid;
    mhp->attr.type = TPT_MW;
    mhp->attr.stag = stag;
    mmid = (stag) >> 8;
    mhp->ibmw.rkey = stag;
    if (insert_handle(rhp, &rhp->mmidr, mhp, mmid)) {
        cxio_deallocate_window(&rhp->rdev, mhp->attr.stag);
        kfree(mhp);
        return ERR_PTR(-ENOMEM);
    }
    PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);
    return &(mhp->ibmw);
}

static int iwch_dealloc_mw(struct ib_mw *mw)
{
    struct iwch_dev *rhp;
    struct iwch_mw *mhp;
    u32 mmid;

    mhp = to_iwch_mw(mw);
    rhp = mhp->rhp;
    mmid = (mw->rkey) >> 8;
    cxio_deallocate_window(&rhp->rdev, mhp->attr.stag);
    remove_handle(rhp, &rhp->mmidr, mmid);
    kfree(mhp);
    PDBG("%s ib_mw %p mmid 0x%x ptr %p\n", __func__, mw, mmid, mhp);
    return 0;
}

static struct ib_mr *iwch_alloc_fast_reg_mr(struct ib_pd *pd, int pbl_depth)
{
    struct iwch_dev *rhp;
    struct iwch_pd *php;
    struct iwch_mr *mhp;
    u32 mmid;
    u32 stag = 0;
    int ret = 0;

    php = to_iwch_pd(pd);
    rhp = php->rhp;
    mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
    if (!mhp)
        goto err;

    mhp->rhp = rhp;
    ret = iwch_alloc_pbl(mhp, pbl_depth);
    if (ret)
        goto err1;
    mhp->attr.pbl_size = pbl_depth;
    ret = cxio_allocate_stag(&rhp->rdev, &stag, php->pdid,
                 mhp->attr.pbl_size, mhp->attr.pbl_addr);
    if (ret)
        goto err2;
    mhp->attr.pdid = php->pdid;
    mhp->attr.type = TPT_NON_SHARED_MR;
    mhp->attr.stag = stag;
    mhp->attr.state = 1;
    mmid = (stag) >> 8;
    mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
    if (insert_handle(rhp, &rhp->mmidr, mhp, mmid))
        goto err3;

    PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);
    return &(mhp->ibmr);
err3:
    cxio_dereg_mem(&rhp->rdev, stag, mhp->attr.pbl_size,
               mhp->attr.pbl_addr);
err2:
    iwch_free_pbl(mhp);
err1:
    kfree(mhp);
err:
    return ERR_PTR(ret);
}

static struct ib_fast_reg_page_list *iwch_alloc_fastreg_pbl(
                    struct ib_device *device,
                    int page_list_len)
{
    struct ib_fast_reg_page_list *page_list;

    page_list = kmalloc(sizeof *page_list + page_list_len * sizeof(u64),
                GFP_KERNEL);
    if (!page_list)
        return ERR_PTR(-ENOMEM);

    page_list->page_list = (u64 *)(page_list + 1);
    page_list->max_page_list_len = page_list_len;

    return page_list;
}

static void iwch_free_fastreg_pbl(struct ib_fast_reg_page_list *page_list)
{
    kfree(page_list);
}

static int iwch_destroy_qp(struct ib_qp *ib_qp)
{
    struct iwch_dev *rhp;
    struct iwch_qp *qhp;
    struct iwch_qp_attributes attrs;
    struct iwch_ucontext *ucontext;

    qhp = to_iwch_qp(ib_qp);
    rhp = qhp->rhp;

    attrs.next_state = IWCH_QP_STATE_ERROR;
    iwch_modify_qp(rhp, qhp, IWCH_QP_ATTR_NEXT_STATE, &attrs, 0);
    wait_event(qhp->wait, !qhp->ep);

    remove_handle(rhp, &rhp->qpidr, qhp->wq.qpid);

    atomic_dec(&qhp->refcnt);
    wait_event(qhp->wait, !atomic_read(&qhp->refcnt));

    ucontext = ib_qp->uobject ? to_iwch_ucontext(ib_qp->uobject->context)
                  : NULL;
    cxio_destroy_qp(&rhp->rdev, &qhp->wq,
            ucontext ? &ucontext->uctx : &rhp->rdev.uctx);

    PDBG("%s ib_qp %p qpid 0x%0x qhp %p\n", __func__,
         ib_qp, qhp->wq.qpid, qhp);
    kfree(qhp);
    return 0;
}

static struct ib_qp *iwch_create_qp(struct ib_pd *pd,
                 struct ib_qp_init_attr *attrs,
                 struct ib_udata *udata)
{
    struct iwch_dev *rhp;
    struct iwch_qp *qhp;
    struct iwch_pd *php;
    struct iwch_cq *schp;
    struct iwch_cq *rchp;
    struct iwch_create_qp_resp uresp;
    int wqsize, sqsize, rqsize;
    struct iwch_ucontext *ucontext;

    PDBG("%s ib_pd %p\n", __func__, pd);
    if (attrs->qp_type != IB_QPT_RC)
        return ERR_PTR(-EINVAL);
    php = to_iwch_pd(pd);
    rhp = php->rhp;
    schp = get_chp(rhp, ((struct iwch_cq *) attrs->send_cq)->cq.cqid);
    rchp = get_chp(rhp, ((struct iwch_cq *) attrs->recv_cq)->cq.cqid);
    if (!schp || !rchp)
        return ERR_PTR(-EINVAL);

    /* The RQT size must be # of entries + 1 rounded up to a power of two */
    rqsize = roundup_pow_of_two(attrs->cap.max_recv_wr);
    if (rqsize == attrs->cap.max_recv_wr)
        rqsize = roundup_pow_of_two(attrs->cap.max_recv_wr+1);

    /* T3 doesn't support RQT depth < 16 */
    if (rqsize < 16)
        rqsize = 16;

    if (rqsize > T3_MAX_RQ_SIZE)
        return ERR_PTR(-EINVAL);

    if (attrs->cap.max_inline_data > T3_MAX_INLINE)
        return ERR_PTR(-EINVAL);

    /*
     * NOTE: The SQ and total WQ sizes don't need to be
     * a power of two.  However, all the code assumes
     * they are. EG: Q_FREECNT() and friends.
     */
    sqsize = roundup_pow_of_two(attrs->cap.max_send_wr);
    wqsize = roundup_pow_of_two(rqsize + sqsize);

    /*
     * Kernel users need more wq space for fastreg WRs which can take
     * 2 WR fragments.
     */
    ucontext = pd->uobject ? to_iwch_ucontext(pd->uobject->context) : NULL;
    if (!ucontext && wqsize < (rqsize + (2 * sqsize)))
        wqsize = roundup_pow_of_two(rqsize +
                roundup_pow_of_two(attrs->cap.max_send_wr * 2));
    PDBG("%s wqsize %d sqsize %d rqsize %d\n", __func__,
         wqsize, sqsize, rqsize);
    qhp = kzalloc(sizeof(*qhp), GFP_KERNEL);
    if (!qhp)
        return ERR_PTR(-ENOMEM);
    qhp->wq.size_log2 = ilog2(wqsize);
    qhp->wq.rq_size_log2 = ilog2(rqsize);
    qhp->wq.sq_size_log2 = ilog2(sqsize);
    if (cxio_create_qp(&rhp->rdev, !udata, &qhp->wq,
               ucontext ? &ucontext->uctx : &rhp->rdev.uctx)) {
        kfree(qhp);
        return ERR_PTR(-ENOMEM);
    }

    attrs->cap.max_recv_wr = rqsize - 1;
    attrs->cap.max_send_wr = sqsize;
    attrs->cap.max_inline_data = T3_MAX_INLINE;

    qhp->rhp = rhp;
    qhp->attr.pd = php->pdid;
    qhp->attr.scq = ((struct iwch_cq *) attrs->send_cq)->cq.cqid;
    qhp->attr.rcq = ((struct iwch_cq *) attrs->recv_cq)->cq.cqid;
    qhp->attr.sq_num_entries = attrs->cap.max_send_wr;
    qhp->attr.rq_num_entries = attrs->cap.max_recv_wr;
    qhp->attr.sq_max_sges = attrs->cap.max_send_sge;
    qhp->attr.sq_max_sges_rdma_write = attrs->cap.max_send_sge;
    qhp->attr.rq_max_sges = attrs->cap.max_recv_sge;
    qhp->attr.state = IWCH_QP_STATE_IDLE;
    qhp->attr.next_state = IWCH_QP_STATE_IDLE;

    /*
     * XXX - These don't get passed in from the openib user
     * at create time.  The CM sets them via a QP modify.
     * Need to fix...  I think the CM should
     */
    qhp->attr.enable_rdma_read = 1;
    qhp->attr.enable_rdma_write = 1;
    qhp->attr.enable_bind = 1;
    qhp->attr.max_ord = 1;
    qhp->attr.max_ird = 1;

    spin_lock_init(&qhp->lock);
    init_waitqueue_head(&qhp->wait);
    atomic_set(&qhp->refcnt, 1);

    if (insert_handle(rhp, &rhp->qpidr, qhp, qhp->wq.qpid)) {
        cxio_destroy_qp(&rhp->rdev, &qhp->wq,
            ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
        kfree(qhp);
        return ERR_PTR(-ENOMEM);
    }

    if (udata) {

        struct iwch_mm_entry *mm1, *mm2;

        mm1 = kmalloc(sizeof *mm1, GFP_KERNEL);
        if (!mm1) {
            iwch_destroy_qp(&qhp->ibqp);
            return ERR_PTR(-ENOMEM);
        }

        mm2 = kmalloc(sizeof *mm2, GFP_KERNEL);
        if (!mm2) {
            kfree(mm1);
            iwch_destroy_qp(&qhp->ibqp);
            return ERR_PTR(-ENOMEM);
        }

        uresp.qpid = qhp->wq.qpid;
        uresp.size_log2 = qhp->wq.size_log2;
        uresp.sq_size_log2 = qhp->wq.sq_size_log2;
        uresp.rq_size_log2 = qhp->wq.rq_size_log2;
        spin_lock(&ucontext->mmap_lock);
        uresp.key = ucontext->key;
        ucontext->key += PAGE_SIZE;
        uresp.db_key = ucontext->key;
        ucontext->key += PAGE_SIZE;
        spin_unlock(&ucontext->mmap_lock);
        if (ib_copy_to_udata(udata, &uresp, sizeof (uresp))) {
            kfree(mm1);
            kfree(mm2);
            iwch_destroy_qp(&qhp->ibqp);
            return ERR_PTR(-EFAULT);
        }
        mm1->key = uresp.key;
        mm1->addr = virt_to_phys(qhp->wq.queue);
        mm1->len = PAGE_ALIGN(wqsize * sizeof (union t3_wr));
        insert_mmap(ucontext, mm1);
        mm2->key = uresp.db_key;
        mm2->addr = qhp->wq.udb & PAGE_MASK;
        mm2->len = PAGE_SIZE;
        insert_mmap(ucontext, mm2);
    }
    qhp->ibqp.qp_num = qhp->wq.qpid;
    init_timer(&(qhp->timer));
    PDBG("%s sq_num_entries %d, rq_num_entries %d "
         "qpid 0x%0x qhp %p dma_addr 0x%llx size %d rq_addr 0x%x\n",
         __func__, qhp->attr.sq_num_entries, qhp->attr.rq_num_entries,
         qhp->wq.qpid, qhp, (unsigned long long) qhp->wq.dma_addr,
         1 << qhp->wq.size_log2, qhp->wq.rq_addr);
    return &qhp->ibqp;
}

static int iwch_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
              int attr_mask, struct ib_udata *udata)
{
    struct iwch_dev *rhp;
    struct iwch_qp *qhp;
    enum iwch_qp_attr_mask mask = 0;
    struct iwch_qp_attributes attrs;

    PDBG("%s ib_qp %p\n", __func__, ibqp);

    /* iwarp does not support the RTR state */
    if ((attr_mask & IB_QP_STATE) && (attr->qp_state == IB_QPS_RTR))
        attr_mask &= ~IB_QP_STATE;

    /* Make sure we still have something left to do */
    if (!attr_mask)
        return 0;

    memset(&attrs, 0, sizeof attrs);
    qhp = to_iwch_qp(ibqp);
    rhp = qhp->rhp;

    attrs.next_state = iwch_convert_state(attr->qp_state);
    attrs.enable_rdma_read = (attr->qp_access_flags &
                   IB_ACCESS_REMOTE_READ) ?  1 : 0;
    attrs.enable_rdma_write = (attr->qp_access_flags &
                IB_ACCESS_REMOTE_WRITE) ? 1 : 0;
    attrs.enable_bind = (attr->qp_access_flags & IB_ACCESS_MW_BIND) ? 1 : 0;


    mask |= (attr_mask & IB_QP_STATE) ? IWCH_QP_ATTR_NEXT_STATE : 0;
    mask |= (attr_mask & IB_QP_ACCESS_FLAGS) ?
            (IWCH_QP_ATTR_ENABLE_RDMA_READ |
             IWCH_QP_ATTR_ENABLE_RDMA_WRITE |
             IWCH_QP_ATTR_ENABLE_RDMA_BIND) : 0;

    return iwch_modify_qp(rhp, qhp, mask, &attrs, 0);
}

void iwch_qp_add_ref(struct ib_qp *qp)
{
    PDBG("%s ib_qp %p\n", __func__, qp);
    atomic_inc(&(to_iwch_qp(qp)->refcnt));
}

void iwch_qp_rem_ref(struct ib_qp *qp)
{
    PDBG("%s ib_qp %p\n", __func__, qp);
    if (atomic_dec_and_test(&(to_iwch_qp(qp)->refcnt)))
            wake_up(&(to_iwch_qp(qp)->wait));
}

static struct ib_qp *iwch_get_qp(struct ib_device *dev, int qpn)
{
    PDBG("%s ib_dev %p qpn 0x%x\n", __func__, dev, qpn);
    return (struct ib_qp *)get_qhp(to_iwch_dev(dev), qpn);
}


static int iwch_query_pkey(struct ib_device *ibdev,
               u8 port, u16 index, u16 * pkey)
{
    PDBG("%s ibdev %p\n", __func__, ibdev);
    *pkey = 0;
    return 0;
}

static int iwch_query_gid(struct ib_device *ibdev, u8 port,
              int index, union ib_gid *gid)
{
    struct iwch_dev *dev;

    PDBG("%s ibdev %p, port %d, index %d, gid %p\n",
           __func__, ibdev, port, index, gid);
    dev = to_iwch_dev(ibdev);
    BUG_ON(port == 0 || port > 2);
    memset(&(gid->raw[0]), 0, sizeof(gid->raw));
    memcpy(&(gid->raw[0]), dev->rdev.port_info.lldevs[port-1]->dev_addr, 6);
    return 0;
}

static u64 fw_vers_string_to_u64(struct iwch_dev *iwch_dev)
{
    struct ethtool_drvinfo info;
    struct net_device *lldev = iwch_dev->rdev.t3cdev_p->lldev;
    char *cp, *next;
    unsigned fw_maj, fw_min, fw_mic;

    lldev->ethtool_ops->get_drvinfo(lldev, &info);

    next = info.fw_version + 1;
    cp = strsep(&next, ".");
    sscanf(cp, "%i", &fw_maj);
    cp = strsep(&next, ".");
    sscanf(cp, "%i", &fw_min);
    cp = strsep(&next, ".");
    sscanf(cp, "%i", &fw_mic);

    return (((u64)fw_maj & 0xffff) << 32) | ((fw_min & 0xffff) << 16) |
           (fw_mic & 0xffff);
}

static int iwch_query_device(struct ib_device *ibdev,
                 struct ib_device_attr *props)
{

    struct iwch_dev *dev;
    PDBG("%s ibdev %p\n", __func__, ibdev);

    dev = to_iwch_dev(ibdev);
    memset(props, 0, sizeof *props);
    memcpy(&props->sys_image_guid, dev->rdev.t3cdev_p->lldev->dev_addr, 6);
    props->hw_ver = dev->rdev.t3cdev_p->type;
    props->fw_ver = fw_vers_string_to_u64(dev);
    props->device_cap_flags = dev->device_cap_flags;
    props->page_size_cap = dev->attr.mem_pgsizes_bitmask;
    props->vendor_id = (u32)dev->rdev.rnic_info.pdev->vendor;
    props->vendor_part_id = (u32)dev->rdev.rnic_info.pdev->device;
    props->max_mr_size = dev->attr.max_mr_size;
    props->max_qp = dev->attr.max_qps;
    props->max_qp_wr = dev->attr.max_wrs;
    props->max_sge = dev->attr.max_sge_per_wr;
    props->max_sge_rd = 1;
    props->max_qp_rd_atom = dev->attr.max_rdma_reads_per_qp;
    props->max_qp_init_rd_atom = dev->attr.max_rdma_reads_per_qp;
    props->max_cq = dev->attr.max_cqs;
    props->max_cqe = dev->attr.max_cqes_per_cq;
    props->max_mr = dev->attr.max_mem_regs;
    props->max_pd = dev->attr.max_pds;
    props->local_ca_ack_delay = 0;
    props->max_fast_reg_page_list_len = T3_MAX_FASTREG_DEPTH;

    return 0;
}

static int iwch_query_port(struct ib_device *ibdev,
               u8 port, struct ib_port_attr *props)
{
    struct iwch_dev *dev;
    struct net_device *netdev;
    struct in_device *inetdev;

    PDBG("%s ibdev %p\n", __func__, ibdev);

    dev = to_iwch_dev(ibdev);
    netdev = dev->rdev.port_info.lldevs[port-1];

    memset(props, 0, sizeof(struct ib_port_attr));
    props->max_mtu = IB_MTU_4096;
    if (netdev->mtu >= 4096)
        props->active_mtu = IB_MTU_4096;
    else if (netdev->mtu >= 2048)
        props->active_mtu = IB_MTU_2048;
    else if (netdev->mtu >= 1024)
        props->active_mtu = IB_MTU_1024;
    else if (netdev->mtu >= 512)
        props->active_mtu = IB_MTU_512;
    else
        props->active_mtu = IB_MTU_256;

    if (!netif_carrier_ok(netdev))
        props->state = IB_PORT_DOWN;
    else {
        inetdev = in_dev_get(netdev);
        if (inetdev) {
            if (inetdev->ifa_list)
                props->state = IB_PORT_ACTIVE;
            else
                props->state = IB_PORT_INIT;
            in_dev_put(inetdev);
        } else
            props->state = IB_PORT_INIT;
    }

    props->port_cap_flags =
        IB_PORT_CM_SUP |
        IB_PORT_SNMP_TUNNEL_SUP |
        IB_PORT_REINIT_SUP |
        IB_PORT_DEVICE_MGMT_SUP |
        IB_PORT_VENDOR_CLASS_SUP | IB_PORT_BOOT_MGMT_SUP;
    props->gid_tbl_len = 1;
    props->pkey_tbl_len = 1;
    props->active_width = 2;
    props->active_speed = IB_SPEED_DDR;
    props->max_msg_sz = -1;

    return 0;
}

static ssize_t show_rev(struct device *dev, struct device_attribute *attr,
            char *buf)
{
    struct iwch_dev *iwch_dev = container_of(dev, struct iwch_dev,
                         ibdev.dev);
    PDBG("%s dev 0x%p\n", __func__, dev);
    return sprintf(buf, "%d\n", iwch_dev->rdev.t3cdev_p->type);
}

static ssize_t show_fw_ver(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct iwch_dev *iwch_dev = container_of(dev, struct iwch_dev,
                         ibdev.dev);
    struct ethtool_drvinfo info;
    struct net_device *lldev = iwch_dev->rdev.t3cdev_p->lldev;

    PDBG("%s dev 0x%p\n", __func__, dev);
    lldev->ethtool_ops->get_drvinfo(lldev, &info);
    return sprintf(buf, "%s\n", info.fw_version);
}

static ssize_t show_hca(struct device *dev, struct device_attribute *attr,
            char *buf)
{
    struct iwch_dev *iwch_dev = container_of(dev, struct iwch_dev,
                         ibdev.dev);
    struct ethtool_drvinfo info;
    struct net_device *lldev = iwch_dev->rdev.t3cdev_p->lldev;

    PDBG("%s dev 0x%p\n", __func__, dev);
    lldev->ethtool_ops->get_drvinfo(lldev, &info);
    return sprintf(buf, "%s\n", info.driver);
}

static ssize_t show_board(struct device *dev, struct device_attribute *attr,
              char *buf)
{
    struct iwch_dev *iwch_dev = container_of(dev, struct iwch_dev,
                         ibdev.dev);
    PDBG("%s dev 0x%p\n", __func__, dev);
    return sprintf(buf, "%x.%x\n", iwch_dev->rdev.rnic_info.pdev->vendor,
               iwch_dev->rdev.rnic_info.pdev->device);
}

static int iwch_get_mib(struct ib_device *ibdev,
            union rdma_protocol_stats *stats)
{
    struct iwch_dev *dev;
    struct tp_mib_stats m;
    int ret;

    PDBG("%s ibdev %p\n", __func__, ibdev);
    dev = to_iwch_dev(ibdev);
    ret = dev->rdev.t3cdev_p->ctl(dev->rdev.t3cdev_p, RDMA_GET_MIB, &m);
    if (ret)
        return -ENOSYS;

    memset(stats, 0, sizeof *stats);
    stats->iw.ipInReceives = ((u64) m.ipInReceive_hi << 32) +
                m.ipInReceive_lo;
    stats->iw.ipInHdrErrors = ((u64) m.ipInHdrErrors_hi << 32) +
                  m.ipInHdrErrors_lo;
    stats->iw.ipInAddrErrors = ((u64) m.ipInAddrErrors_hi << 32) +
                   m.ipInAddrErrors_lo;
    stats->iw.ipInUnknownProtos = ((u64) m.ipInUnknownProtos_hi << 32) +
                      m.ipInUnknownProtos_lo;
    stats->iw.ipInDiscards = ((u64) m.ipInDiscards_hi << 32) +
                 m.ipInDiscards_lo;
    stats->iw.ipInDelivers = ((u64) m.ipInDelivers_hi << 32) +
                 m.ipInDelivers_lo;
    stats->iw.ipOutRequests = ((u64) m.ipOutRequests_hi << 32) +
                  m.ipOutRequests_lo;
    stats->iw.ipOutDiscards = ((u64) m.ipOutDiscards_hi << 32) +
                  m.ipOutDiscards_lo;
    stats->iw.ipOutNoRoutes = ((u64) m.ipOutNoRoutes_hi << 32) +
                  m.ipOutNoRoutes_lo;
    stats->iw.ipReasmTimeout = (u64) m.ipReasmTimeout;
    stats->iw.ipReasmReqds = (u64) m.ipReasmReqds;
    stats->iw.ipReasmOKs = (u64) m.ipReasmOKs;
    stats->iw.ipReasmFails = (u64) m.ipReasmFails;
    stats->iw.tcpActiveOpens = (u64) m.tcpActiveOpens;
    stats->iw.tcpPassiveOpens = (u64) m.tcpPassiveOpens;
    stats->iw.tcpAttemptFails = (u64) m.tcpAttemptFails;
    stats->iw.tcpEstabResets = (u64) m.tcpEstabResets;
    stats->iw.tcpOutRsts = (u64) m.tcpOutRsts;
    stats->iw.tcpCurrEstab = (u64) m.tcpCurrEstab;
    stats->iw.tcpInSegs = ((u64) m.tcpInSegs_hi << 32) +
                  m.tcpInSegs_lo;
    stats->iw.tcpOutSegs = ((u64) m.tcpOutSegs_hi << 32) +
                   m.tcpOutSegs_lo;
    stats->iw.tcpRetransSegs = ((u64) m.tcpRetransSeg_hi << 32) +
                  m.tcpRetransSeg_lo;
    stats->iw.tcpInErrs = ((u64) m.tcpInErrs_hi << 32) +
                  m.tcpInErrs_lo;
    stats->iw.tcpRtoMin = (u64) m.tcpRtoMin;
    stats->iw.tcpRtoMax = (u64) m.tcpRtoMax;
    return 0;
}

static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
static DEVICE_ATTR(fw_ver, S_IRUGO, show_fw_ver, NULL);
static DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
static DEVICE_ATTR(board_id, S_IRUGO, show_board, NULL);

static struct device_attribute *iwch_class_attributes[] = {
    &dev_attr_hw_rev,
    &dev_attr_fw_ver,
    &dev_attr_hca_type,
    &dev_attr_board_id,
};

int iwch_register_device(struct iwch_dev *dev)
{
    int ret;
    int i;

    PDBG("%s iwch_dev %p\n", __func__, dev);
    strlcpy(dev->ibdev.name, "cxgb3_%d", IB_DEVICE_NAME_MAX);
    memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid));
    memcpy(&dev->ibdev.node_guid, dev->rdev.t3cdev_p->lldev->dev_addr, 6);
    dev->ibdev.owner = THIS_MODULE;
    dev->device_cap_flags = IB_DEVICE_LOCAL_DMA_LKEY |
                IB_DEVICE_MEM_WINDOW |
                IB_DEVICE_MEM_MGT_EXTENSIONS;

    /* cxgb3 supports STag 0. */
    dev->ibdev.local_dma_lkey = 0;

    dev->ibdev.uverbs_cmd_mask =
        (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
        (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
        (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
        (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
        (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
        (1ull << IB_USER_VERBS_CMD_REG_MR) |
        (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
        (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
        (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
        (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
        (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
        (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
        (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
        (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
        (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
        (1ull << IB_USER_VERBS_CMD_POST_SEND) |
        (1ull << IB_USER_VERBS_CMD_POST_RECV);
    dev->ibdev.node_type = RDMA_NODE_RNIC;
    memcpy(dev->ibdev.node_desc, IWCH_NODE_DESC, sizeof(IWCH_NODE_DESC));
    dev->ibdev.phys_port_cnt = dev->rdev.port_info.nports;
    dev->ibdev.num_comp_vectors = 1;
    dev->ibdev.dma_device = &(dev->rdev.rnic_info.pdev->dev);
    dev->ibdev.query_device = iwch_query_device;
    dev->ibdev.query_port = iwch_query_port;
    dev->ibdev.query_pkey = iwch_query_pkey;
    dev->ibdev.query_gid = iwch_query_gid;
    dev->ibdev.alloc_ucontext = iwch_alloc_ucontext;
    dev->ibdev.dealloc_ucontext = iwch_dealloc_ucontext;
    dev->ibdev.mmap = iwch_mmap;
    dev->ibdev.alloc_pd = iwch_allocate_pd;
    dev->ibdev.dealloc_pd = iwch_deallocate_pd;
    dev->ibdev.create_ah = iwch_ah_create;
    dev->ibdev.destroy_ah = iwch_ah_destroy;
    dev->ibdev.create_qp = iwch_create_qp;
    dev->ibdev.modify_qp = iwch_ib_modify_qp;
    dev->ibdev.destroy_qp = iwch_destroy_qp;
    dev->ibdev.create_cq = iwch_create_cq;
    dev->ibdev.destroy_cq = iwch_destroy_cq;
    dev->ibdev.resize_cq = iwch_resize_cq;
    dev->ibdev.poll_cq = iwch_poll_cq;
    dev->ibdev.get_dma_mr = iwch_get_dma_mr;
    dev->ibdev.reg_phys_mr = iwch_register_phys_mem;
    dev->ibdev.rereg_phys_mr = iwch_reregister_phys_mem;
    dev->ibdev.reg_user_mr = iwch_reg_user_mr;
    dev->ibdev.dereg_mr = iwch_dereg_mr;
    dev->ibdev.alloc_mw = iwch_alloc_mw;
    dev->ibdev.bind_mw = iwch_bind_mw;
    dev->ibdev.dealloc_mw = iwch_dealloc_mw;
    dev->ibdev.alloc_fast_reg_mr = iwch_alloc_fast_reg_mr;
    dev->ibdev.alloc_fast_reg_page_list = iwch_alloc_fastreg_pbl;
    dev->ibdev.free_fast_reg_page_list = iwch_free_fastreg_pbl;
    dev->ibdev.attach_mcast = iwch_multicast_attach;
    dev->ibdev.detach_mcast = iwch_multicast_detach;
    dev->ibdev.process_mad = iwch_process_mad;
    dev->ibdev.req_notify_cq = iwch_arm_cq;
    dev->ibdev.post_send = iwch_post_send;
    dev->ibdev.post_recv = iwch_post_receive;
    dev->ibdev.get_protocol_stats = iwch_get_mib;
    dev->ibdev.uverbs_abi_ver = IWCH_UVERBS_ABI_VERSION;

    dev->ibdev.iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL);
    if (!dev->ibdev.iwcm)
        return -ENOMEM;

    dev->ibdev.iwcm->connect = iwch_connect;
    dev->ibdev.iwcm->accept = iwch_accept_cr;
    dev->ibdev.iwcm->reject = iwch_reject_cr;
    dev->ibdev.iwcm->create_listen = iwch_create_listen;
    dev->ibdev.iwcm->destroy_listen = iwch_destroy_listen;
    dev->ibdev.iwcm->add_ref = iwch_qp_add_ref;
    dev->ibdev.iwcm->rem_ref = iwch_qp_rem_ref;
    dev->ibdev.iwcm->get_qp = iwch_get_qp;

    ret = ib_register_device(&dev->ibdev, NULL);
    if (ret)
        goto bail1;

    for (i = 0; i < ARRAY_SIZE(iwch_class_attributes); ++i) {
        ret = device_create_file(&dev->ibdev.dev,
                     iwch_class_attributes[i]);
        if (ret) {
            goto bail2;
        }
    }
    return 0;
bail2:
    ib_unregister_device(&dev->ibdev);
bail1:
    kfree(dev->ibdev.iwcm);
    return ret;
}

void iwch_unregister_device(struct iwch_dev *dev)
{
    int i;

    PDBG("%s iwch_dev %p\n", __func__, dev);
    for (i = 0; i < ARRAY_SIZE(iwch_class_attributes); ++i)
        device_remove_file(&dev->ibdev.dev,
                   iwch_class_attributes[i]);
    ib_unregister_device(&dev->ibdev);
    kfree(dev->ibdev.iwcm);
    return;
}