drivers/infiniband/hw/cxgb3/iwch_provider.c

/*
 * 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/spinlock.h>
#include <linux/ethtool.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_user_verbs.h>

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

static int iwch_modify_port(struct ib_device *ibdev,
			    u8 port, int port_modify_mask,
			    struct ib_port_modify *props)
{
	return -ENOSYS;
}

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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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,
			     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;

	PDBG("%s ib_dev %p entries %d\n", __FUNCTION__, 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)) {
		kfree(chp);
		return ERR_PTR(-ENOMEM);
	}
	chp->rhp = rhp;
	chp->ibcq.cqe = (1 << chp->cq.size_log2) - 1;
	spin_lock_init(&chp->lock);
	atomic_set(&chp->refcnt, 1);
	init_waitqueue_head(&chp->wait);
	insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid);

	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);
		if (ib_copy_to_udata(udata, &uresp, sizeof (uresp))) {
			kfree(mm);
			iwch_destroy_cq(&chp->ibcq);
			return ERR_PTR(-EFAULT);
		}
		mm->key = uresp.key;
		mm->addr = virt_to_phys(chp->cq.queue);
		mm->len = PAGE_ALIGN((1UL << uresp.size_log2) *
					     sizeof (struct t3_cqe));
		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", __FUNCTION__, 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",
			__FUNCTION__, 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 notify)
{
	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 (notify == 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", __FUNCTION__, chp->cq.rptr);
	err = cxio_hal_cq_op(&rhp->rdev, &chp->cq, cq_op, 0);
	spin_unlock_irqrestore(&chp->lock, flag);
	if (err)
		printk(KERN_ERR MOD "Error %d rearming CQID 0x%x\n", err,
		       chp->cq.cqid);
	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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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);
	remove_handle(rhp, &rhp->mmidr, mmid);
	if (mhp->kva)
		kfree((void *) (unsigned long) mhp->kva);
	PDBG("%s mmid 0x%x ptr %p\n", __FUNCTION__, 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", __FUNCTION__, pd);
	php = to_iwch_pd(pd);
	rhp = php->rhp;

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

	/* 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;

	mhp->rhp = rhp;
	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, page_list);
	kfree(page_list);
	if (ret) {
		goto err;
	}
	return &mhp->ibmr;
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", __FUNCTION__, 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);

	ret = iwch_reregister_mem(rhp, php, &mh, shift, page_list, 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, struct ib_umem *region,
				      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", __FUNCTION__, pd);
	shift = ffs(region->page_size) - 1;

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

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

	pages = kmalloc(n * sizeof(u64), GFP_KERNEL);
	if (!pages) {
		err = -ENOMEM;
		goto err;
	}

	i = n = 0;

	list_for_each_entry(chunk, &region->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]) +
					region->page_size * k);
			}
		}

	mhp->rhp = rhp;
	mhp->attr.pdid = php->pdid;
	mhp->attr.zbva = 0;
	mhp->attr.perms = iwch_ib_to_tpt_access(acc);
	mhp->attr.va_fbo = region->virt_base;
	mhp->attr.page_size = shift - 12;
	mhp->attr.len = (u32) region->length;
	mhp->attr.pbl_size = i;
	err = iwch_register_mem(rhp, php, mhp, shift, pages);
	kfree(pages);
	if (err)
		goto err;

	if (udata && t3b_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", __FUNCTION__,
		     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:
	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", __FUNCTION__, 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;
	insert_handle(rhp, &rhp->mmidr, mhp, mmid);
	PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __FUNCTION__, 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", __FUNCTION__, mw, mmid, mhp);
	return 0;
}

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", __FUNCTION__,
	     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", __FUNCTION__, 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);

	/*
	 * 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);
	PDBG("%s wqsize %d sqsize %d rqsize %d\n", __FUNCTION__,
	     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);
	ucontext = pd->uobject ? to_iwch_ucontext(pd->uobject->context) : NULL;
	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;
	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);
	insert_handle(rhp, &rhp->qpidr, qhp, qhp->wq.qpid);

	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\n",
	     __FUNCTION__, 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);
	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", __FUNCTION__, 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", __FUNCTION__, qp);
	atomic_inc(&(to_iwch_qp(qp)->refcnt));
}

void iwch_qp_rem_ref(struct ib_qp *qp)
{
	PDBG("%s ib_qp %p\n", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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",
	       __FUNCTION__, 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 int iwch_query_device(struct ib_device *ibdev,
			     struct ib_device_attr *props)
{

	struct iwch_dev *dev;
	PDBG("%s ibdev %p\n", __FUNCTION__, 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->device_cap_flags = dev->device_cap_flags;
	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 = ~0ull;
	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_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;

	return 0;
}

static int iwch_query_port(struct ib_device *ibdev,
			   u8 port, struct ib_port_attr *props)
{
	PDBG("%s ibdev %p\n", __FUNCTION__, ibdev);
	props->max_mtu = IB_MTU_4096;
	props->lid = 0;
	props->lmc = 0;
	props->sm_lid = 0;
	props->sm_sl = 0;
	props->state = IB_PORT_ACTIVE;
	props->phys_state = 0;
	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->qkey_viol_cntr = 0;
	props->active_width = 2;
	props->active_speed = 2;
	props->max_msg_sz = -1;

	return 0;
}

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

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

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

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

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

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

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

static struct class_device_attribute *iwch_class_attributes[] = {
	&class_device_attr_hw_rev,
	&class_device_attr_fw_ver,
	&class_device_attr_hca_type,
	&class_device_attr_board_id
};

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

	PDBG("%s iwch_dev %p\n", __FUNCTION__, 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_ZERO_STAG |
	     IB_DEVICE_SEND_W_INV | IB_DEVICE_MEM_WINDOW);

	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.dma_device = &(dev->rdev.rnic_info.pdev->dev);
	dev->ibdev.class_dev.dev = &(dev->rdev.rnic_info.pdev->dev);
	dev->ibdev.query_device = iwch_query_device;
	dev->ibdev.query_port = iwch_query_port;
	dev->ibdev.modify_port = iwch_modify_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.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.iwcm =
	    (struct iw_cm_verbs *) kmalloc(sizeof(struct iw_cm_verbs),
					   GFP_KERNEL);
	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);
	if (ret)
		goto bail1;

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

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

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