drivers/infiniband/hw/cxgb4/provider.c

/*
 * Copyright (c) 2009-2010 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 <linux/rtnetlink.h>
#include <linux/inetdevice.h>
#include <linux/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 "iw_cxgb4.h"

static int fastreg_support = 1;
module_param(fastreg_support, int, 0644);
MODULE_PARM_DESC(fastreg_support, "Advertise fastreg support (default=1)");

void _c4iw_free_ucontext(struct kref *kref)
{
	struct c4iw_ucontext *ucontext;
	struct c4iw_dev *rhp;
	struct c4iw_mm_entry *mm, *tmp;

	ucontext = container_of(kref, struct c4iw_ucontext, kref);
	rhp = to_c4iw_dev(ucontext->ibucontext.device);

	pr_debug("ucontext %p\n", ucontext);
	list_for_each_entry_safe(mm, tmp, &ucontext->mmaps, entry)
		kfree(mm);
	c4iw_release_dev_ucontext(&rhp->rdev, &ucontext->uctx);
	kfree(ucontext);
}

static int c4iw_dealloc_ucontext(struct ib_ucontext *context)
{
	struct c4iw_ucontext *ucontext = to_c4iw_ucontext(context);

	pr_debug("context %p\n", context);
	c4iw_put_ucontext(ucontext);
	return 0;
}

static struct ib_ucontext *c4iw_alloc_ucontext(struct ib_device *ibdev,
					       struct ib_udata *udata)
{
	struct c4iw_ucontext *context;
	struct c4iw_dev *rhp = to_c4iw_dev(ibdev);
	struct c4iw_alloc_ucontext_resp uresp;
	int ret = 0;
	struct c4iw_mm_entry *mm = NULL;

	pr_debug("ibdev %p\n", ibdev);
	context = kzalloc(sizeof(*context), GFP_KERNEL);
	if (!context) {
		ret = -ENOMEM;
		goto err;
	}

	c4iw_init_dev_ucontext(&rhp->rdev, &context->uctx);
	INIT_LIST_HEAD(&context->mmaps);
	spin_lock_init(&context->mmap_lock);
	kref_init(&context->kref);

	if (udata->outlen < sizeof(uresp) - sizeof(uresp.reserved)) {
		pr_err_once("Warning - downlevel libcxgb4 (non-fatal), device status page disabled\n");
		rhp->rdev.flags |= T4_STATUS_PAGE_DISABLED;
	} else {
		mm = kmalloc(sizeof(*mm), GFP_KERNEL);
		if (!mm) {
			ret = -ENOMEM;
			goto err_free;
		}

		uresp.status_page_size = PAGE_SIZE;

		spin_lock(&context->mmap_lock);
		uresp.status_page_key = context->key;
		context->key += PAGE_SIZE;
		spin_unlock(&context->mmap_lock);

		ret = ib_copy_to_udata(udata, &uresp,
				       sizeof(uresp) - sizeof(uresp.reserved));
		if (ret)
			goto err_mm;

		mm->key = uresp.status_page_key;
		mm->addr = virt_to_phys(rhp->rdev.status_page);
		mm->len = PAGE_SIZE;
		insert_mmap(context, mm);
	}
	return &context->ibucontext;
err_mm:
	kfree(mm);
err_free:
	kfree(context);
err:
	return ERR_PTR(ret);
}

static int c4iw_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 c4iw_rdev *rdev;
	int ret = 0;
	struct c4iw_mm_entry *mm;
	struct c4iw_ucontext *ucontext;
	u64 addr;

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

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

	rdev = &(to_c4iw_dev(context->device)->rdev);
	ucontext = to_c4iw_ucontext(context);

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

	if ((addr >= pci_resource_start(rdev->lldi.pdev, 0)) &&
	    (addr < (pci_resource_start(rdev->lldi.pdev, 0) +
		    pci_resource_len(rdev->lldi.pdev, 0)))) {

		/*
		 * MA_SYNC register...
		 */
		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
		ret = io_remap_pfn_range(vma, vma->vm_start,
					 addr >> PAGE_SHIFT,
					 len, vma->vm_page_prot);
	} else if ((addr >= pci_resource_start(rdev->lldi.pdev, 2)) &&
		   (addr < (pci_resource_start(rdev->lldi.pdev, 2) +
		    pci_resource_len(rdev->lldi.pdev, 2)))) {

		/*
		 * Map user DB or OCQP memory...
		 */
		if (addr >= rdev->oc_mw_pa)
			vma->vm_page_prot = t4_pgprot_wc(vma->vm_page_prot);
		else {
			if (!is_t4(rdev->lldi.adapter_type))
				vma->vm_page_prot =
					t4_pgprot_wc(vma->vm_page_prot);
			else
				vma->vm_page_prot =
					pgprot_noncached(vma->vm_page_prot);
		}
		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 c4iw_deallocate_pd(struct ib_pd *pd)
{
	struct c4iw_dev *rhp;
	struct c4iw_pd *php;

	php = to_c4iw_pd(pd);
	rhp = php->rhp;
	pr_debug("ibpd %p pdid 0x%x\n", pd, php->pdid);
	c4iw_put_resource(&rhp->rdev.resource.pdid_table, php->pdid);
	mutex_lock(&rhp->rdev.stats.lock);
	rhp->rdev.stats.pd.cur--;
	mutex_unlock(&rhp->rdev.stats.lock);
	kfree(php);
	return 0;
}

static struct ib_pd *c4iw_allocate_pd(struct ib_device *ibdev,
				      struct ib_ucontext *context,
				      struct ib_udata *udata)
{
	struct c4iw_pd *php;
	u32 pdid;
	struct c4iw_dev *rhp;

	pr_debug("ibdev %p\n", ibdev);
	rhp = (struct c4iw_dev *) ibdev;
	pdid =  c4iw_get_resource(&rhp->rdev.resource.pdid_table);
	if (!pdid)
		return ERR_PTR(-EINVAL);
	php = kzalloc(sizeof(*php), GFP_KERNEL);
	if (!php) {
		c4iw_put_resource(&rhp->rdev.resource.pdid_table, pdid);
		return ERR_PTR(-ENOMEM);
	}
	php->pdid = pdid;
	php->rhp = rhp;
	if (context) {
		struct c4iw_alloc_pd_resp uresp = {.pdid = php->pdid};

		if (ib_copy_to_udata(udata, &uresp, sizeof(uresp))) {
			c4iw_deallocate_pd(&php->ibpd);
			return ERR_PTR(-EFAULT);
		}
	}
	mutex_lock(&rhp->rdev.stats.lock);
	rhp->rdev.stats.pd.cur++;
	if (rhp->rdev.stats.pd.cur > rhp->rdev.stats.pd.max)
		rhp->rdev.stats.pd.max = rhp->rdev.stats.pd.cur;
	mutex_unlock(&rhp->rdev.stats.lock);
	pr_debug("pdid 0x%0x ptr 0x%p\n", pdid, php);
	return &php->ibpd;
}

static int c4iw_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
			   u16 *pkey)
{
	pr_debug("ibdev %p\n", ibdev);
	*pkey = 0;
	return 0;
}

static int c4iw_query_gid(struct ib_device *ibdev, u8 port, int index,
			  union ib_gid *gid)
{
	struct c4iw_dev *dev;

	pr_debug("ibdev %p, port %d, index %d, gid %p\n",
		 ibdev, port, index, gid);
	if (!port)
		return -EINVAL;
	dev = to_c4iw_dev(ibdev);
	memset(&(gid->raw[0]), 0, sizeof(gid->raw));
	memcpy(&(gid->raw[0]), dev->rdev.lldi.ports[port-1]->dev_addr, 6);
	return 0;
}

static int c4iw_query_device(struct ib_device *ibdev, struct ib_device_attr *props,
			     struct ib_udata *uhw)
{

	struct c4iw_dev *dev;

	pr_debug("ibdev %p\n", ibdev);

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

	dev = to_c4iw_dev(ibdev);
	memset(props, 0, sizeof *props);
	memcpy(&props->sys_image_guid, dev->rdev.lldi.ports[0]->dev_addr, 6);
	props->hw_ver = CHELSIO_CHIP_RELEASE(dev->rdev.lldi.adapter_type);
	props->fw_ver = dev->rdev.lldi.fw_vers;
	props->device_cap_flags = dev->device_cap_flags;
	props->page_size_cap = T4_PAGESIZE_MASK;
	props->vendor_id = (u32)dev->rdev.lldi.pdev->vendor;
	props->vendor_part_id = (u32)dev->rdev.lldi.pdev->device;
	props->max_mr_size = T4_MAX_MR_SIZE;
	props->max_qp = dev->rdev.lldi.vr->qp.size / 2;
	props->max_srq = dev->rdev.lldi.vr->srq.size;
	props->max_qp_wr = dev->rdev.hw_queue.t4_max_qp_depth;
	props->max_srq_wr = dev->rdev.hw_queue.t4_max_qp_depth;
	props->max_send_sge = min(T4_MAX_SEND_SGE, T4_MAX_WRITE_SGE);
	props->max_recv_sge = T4_MAX_RECV_SGE;
	props->max_srq_sge = T4_MAX_RECV_SGE;
	props->max_sge_rd = 1;
	props->max_res_rd_atom = dev->rdev.lldi.max_ird_adapter;
	props->max_qp_rd_atom = min(dev->rdev.lldi.max_ordird_qp,
				    c4iw_max_read_depth);
	props->max_qp_init_rd_atom = props->max_qp_rd_atom;
	props->max_cq = dev->rdev.lldi.vr->qp.size;
	props->max_cqe = dev->rdev.hw_queue.t4_max_cq_depth;
	props->max_mr = c4iw_num_stags(&dev->rdev);
	props->max_pd = T4_MAX_NUM_PD;
	props->local_ca_ack_delay = 0;
	props->max_fast_reg_page_list_len =
		t4_max_fr_depth(dev->rdev.lldi.ulptx_memwrite_dsgl && use_dsgl);

	return 0;
}

static int c4iw_query_port(struct ib_device *ibdev, u8 port,
			   struct ib_port_attr *props)
{
	struct c4iw_dev *dev;
	struct net_device *netdev;
	struct in_device *inetdev;

	pr_debug("ibdev %p\n", ibdev);

	dev = to_c4iw_dev(ibdev);
	netdev = dev->rdev.lldi.ports[port-1];
	/* props being zeroed by the caller, avoid zeroing it here */
	props->max_mtu = IB_MTU_4096;
	props->active_mtu = ib_mtu_int_to_enum(netdev->mtu);

	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 c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
						 ibdev.dev);
	pr_debug("dev 0x%p\n", dev);
	return sprintf(buf, "%d\n",
		       CHELSIO_CHIP_RELEASE(c4iw_dev->rdev.lldi.adapter_type));
}

static ssize_t show_hca(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
						 ibdev.dev);
	struct ethtool_drvinfo info;
	struct net_device *lldev = c4iw_dev->rdev.lldi.ports[0];

	pr_debug("dev 0x%p\n", 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 c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
						 ibdev.dev);
	pr_debug("dev 0x%p\n", dev);
	return sprintf(buf, "%x.%x\n", c4iw_dev->rdev.lldi.pdev->vendor,
		       c4iw_dev->rdev.lldi.pdev->device);
}

enum counters {
	IP4INSEGS,
	IP4OUTSEGS,
	IP4RETRANSSEGS,
	IP4OUTRSTS,
	IP6INSEGS,
	IP6OUTSEGS,
	IP6RETRANSSEGS,
	IP6OUTRSTS,
	NR_COUNTERS
};

static const char * const names[] = {
	[IP4INSEGS] = "ip4InSegs",
	[IP4OUTSEGS] = "ip4OutSegs",
	[IP4RETRANSSEGS] = "ip4RetransSegs",
	[IP4OUTRSTS] = "ip4OutRsts",
	[IP6INSEGS] = "ip6InSegs",
	[IP6OUTSEGS] = "ip6OutSegs",
	[IP6RETRANSSEGS] = "ip6RetransSegs",
	[IP6OUTRSTS] = "ip6OutRsts"
};

static struct rdma_hw_stats *c4iw_alloc_stats(struct ib_device *ibdev,
					      u8 port_num)
{
	BUILD_BUG_ON(ARRAY_SIZE(names) != NR_COUNTERS);

	if (port_num != 0)
		return NULL;

	return rdma_alloc_hw_stats_struct(names, NR_COUNTERS,
					  RDMA_HW_STATS_DEFAULT_LIFESPAN);
}

static int c4iw_get_mib(struct ib_device *ibdev,
			struct rdma_hw_stats *stats,
			u8 port, int index)
{
	struct tp_tcp_stats v4, v6;
	struct c4iw_dev *c4iw_dev = to_c4iw_dev(ibdev);

	cxgb4_get_tcp_stats(c4iw_dev->rdev.lldi.pdev, &v4, &v6);
	stats->value[IP4INSEGS] = v4.tcp_in_segs;
	stats->value[IP4OUTSEGS] = v4.tcp_out_segs;
	stats->value[IP4RETRANSSEGS] = v4.tcp_retrans_segs;
	stats->value[IP4OUTRSTS] = v4.tcp_out_rsts;
	stats->value[IP6INSEGS] = v6.tcp_in_segs;
	stats->value[IP6OUTSEGS] = v6.tcp_out_segs;
	stats->value[IP6RETRANSSEGS] = v6.tcp_retrans_segs;
	stats->value[IP6OUTRSTS] = v6.tcp_out_rsts;

	return stats->num_counters;
}

static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, 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 *c4iw_class_attributes[] = {
	&dev_attr_hw_rev,
	&dev_attr_hca_type,
	&dev_attr_board_id,
};

static int c4iw_port_immutable(struct ib_device *ibdev, u8 port_num,
			       struct ib_port_immutable *immutable)
{
	struct ib_port_attr attr;
	int err;

	immutable->core_cap_flags = RDMA_CORE_PORT_IWARP;

	err = ib_query_port(ibdev, port_num, &attr);
	if (err)
		return err;

	immutable->pkey_tbl_len = attr.pkey_tbl_len;
	immutable->gid_tbl_len = attr.gid_tbl_len;

	return 0;
}

static void get_dev_fw_str(struct ib_device *dev, char *str)
{
	struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev,
						 ibdev);
	pr_debug("dev 0x%p\n", dev);

	snprintf(str, IB_FW_VERSION_NAME_MAX, "%u.%u.%u.%u",
		 FW_HDR_FW_VER_MAJOR_G(c4iw_dev->rdev.lldi.fw_vers),
		 FW_HDR_FW_VER_MINOR_G(c4iw_dev->rdev.lldi.fw_vers),
		 FW_HDR_FW_VER_MICRO_G(c4iw_dev->rdev.lldi.fw_vers),
		 FW_HDR_FW_VER_BUILD_G(c4iw_dev->rdev.lldi.fw_vers));
}

static struct net_device *get_netdev(struct ib_device *dev, u8 port)
{
	struct c4iw_dev *c4iw_dev = container_of(dev, struct c4iw_dev, ibdev);
	struct c4iw_rdev *rdev = &c4iw_dev->rdev;
	struct net_device *ndev;

	if (!port || port > rdev->lldi.nports)
		return NULL;

	rcu_read_lock();
	ndev = rdev->lldi.ports[port - 1];
	if (ndev)
		dev_hold(ndev);
	rcu_read_unlock();

	return ndev;
}

static int fill_res_entry(struct sk_buff *msg, struct rdma_restrack_entry *res)
{
	return (res->type < ARRAY_SIZE(c4iw_restrack_funcs) &&
		c4iw_restrack_funcs[res->type]) ?
		c4iw_restrack_funcs[res->type](msg, res) : 0;
}

void c4iw_register_device(struct work_struct *work)
{
	int ret;
	int i;
	struct uld_ctx *ctx = container_of(work, struct uld_ctx, reg_work);
	struct c4iw_dev *dev = ctx->dev;

	pr_debug("c4iw_dev %p\n", dev);
	strlcpy(dev->ibdev.name, "cxgb4_%d", IB_DEVICE_NAME_MAX);
	memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid));
	memcpy(&dev->ibdev.node_guid, dev->rdev.lldi.ports[0]->dev_addr, 6);
	dev->ibdev.owner = THIS_MODULE;
	dev->device_cap_flags = IB_DEVICE_LOCAL_DMA_LKEY | IB_DEVICE_MEM_WINDOW;
	if (fastreg_support)
		dev->device_cap_flags |= IB_DEVICE_MEM_MGT_EXTENSIONS;
	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_QUERY_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) |
	    (1ull << IB_USER_VERBS_CMD_CREATE_SRQ) |
	    (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ) |
	    (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ);
	dev->ibdev.node_type = RDMA_NODE_RNIC;
	BUILD_BUG_ON(sizeof(C4IW_NODE_DESC) > IB_DEVICE_NODE_DESC_MAX);
	memcpy(dev->ibdev.node_desc, C4IW_NODE_DESC, sizeof(C4IW_NODE_DESC));
	dev->ibdev.phys_port_cnt = dev->rdev.lldi.nports;
	dev->ibdev.num_comp_vectors =  dev->rdev.lldi.nciq;
	dev->ibdev.dev.parent = &dev->rdev.lldi.pdev->dev;
	dev->ibdev.query_device = c4iw_query_device;
	dev->ibdev.query_port = c4iw_query_port;
	dev->ibdev.query_pkey = c4iw_query_pkey;
	dev->ibdev.query_gid = c4iw_query_gid;
	dev->ibdev.alloc_ucontext = c4iw_alloc_ucontext;
	dev->ibdev.dealloc_ucontext = c4iw_dealloc_ucontext;
	dev->ibdev.mmap = c4iw_mmap;
	dev->ibdev.alloc_pd = c4iw_allocate_pd;
	dev->ibdev.dealloc_pd = c4iw_deallocate_pd;
	dev->ibdev.create_qp = c4iw_create_qp;
	dev->ibdev.modify_qp = c4iw_ib_modify_qp;
	dev->ibdev.query_qp = c4iw_ib_query_qp;
	dev->ibdev.destroy_qp = c4iw_destroy_qp;
	dev->ibdev.create_srq = c4iw_create_srq;
	dev->ibdev.modify_srq = c4iw_modify_srq;
	dev->ibdev.destroy_srq = c4iw_destroy_srq;
	dev->ibdev.create_cq = c4iw_create_cq;
	dev->ibdev.destroy_cq = c4iw_destroy_cq;
	dev->ibdev.poll_cq = c4iw_poll_cq;
	dev->ibdev.get_dma_mr = c4iw_get_dma_mr;
	dev->ibdev.reg_user_mr = c4iw_reg_user_mr;
	dev->ibdev.dereg_mr = c4iw_dereg_mr;
	dev->ibdev.alloc_mw = c4iw_alloc_mw;
	dev->ibdev.dealloc_mw = c4iw_dealloc_mw;
	dev->ibdev.alloc_mr = c4iw_alloc_mr;
	dev->ibdev.map_mr_sg = c4iw_map_mr_sg;
	dev->ibdev.req_notify_cq = c4iw_arm_cq;
	dev->ibdev.post_send = c4iw_post_send;
	dev->ibdev.post_recv = c4iw_post_receive;
	dev->ibdev.post_srq_recv = c4iw_post_srq_recv;
	dev->ibdev.alloc_hw_stats = c4iw_alloc_stats;
	dev->ibdev.get_hw_stats = c4iw_get_mib;
	dev->ibdev.uverbs_abi_ver = C4IW_UVERBS_ABI_VERSION;
	dev->ibdev.get_port_immutable = c4iw_port_immutable;
	dev->ibdev.get_dev_fw_str = get_dev_fw_str;
	dev->ibdev.get_netdev = get_netdev;

	dev->ibdev.iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL);
	if (!dev->ibdev.iwcm) {
		ret = -ENOMEM;
		goto err_dealloc_ctx;
	}

	dev->ibdev.iwcm->connect = c4iw_connect;
	dev->ibdev.iwcm->accept = c4iw_accept_cr;
	dev->ibdev.iwcm->reject = c4iw_reject_cr;
	dev->ibdev.iwcm->create_listen = c4iw_create_listen;
	dev->ibdev.iwcm->destroy_listen = c4iw_destroy_listen;
	dev->ibdev.iwcm->add_ref = c4iw_qp_add_ref;
	dev->ibdev.iwcm->rem_ref = c4iw_qp_rem_ref;
	dev->ibdev.iwcm->get_qp = c4iw_get_qp;
	dev->ibdev.res.fill_res_entry = fill_res_entry;
	memcpy(dev->ibdev.iwcm->ifname, dev->rdev.lldi.ports[0]->name,
	       sizeof(dev->ibdev.iwcm->ifname));

	dev->ibdev.driver_id = RDMA_DRIVER_CXGB4;
	ret = ib_register_device(&dev->ibdev, NULL);
	if (ret)
		goto err_kfree_iwcm;

	for (i = 0; i < ARRAY_SIZE(c4iw_class_attributes); ++i) {
		ret = device_create_file(&dev->ibdev.dev,
					 c4iw_class_attributes[i]);
		if (ret)
			goto err_unregister_device;
	}
	return;
err_unregister_device:
	ib_unregister_device(&dev->ibdev);
err_kfree_iwcm:
	kfree(dev->ibdev.iwcm);
err_dealloc_ctx:
	pr_err("%s - Failed registering iwarp device: %d\n",
	       pci_name(ctx->lldi.pdev), ret);
	c4iw_dealloc(ctx);
	return;
}

void c4iw_unregister_device(struct c4iw_dev *dev)
{
	int i;

	pr_debug("c4iw_dev %p\n", dev);
	for (i = 0; i < ARRAY_SIZE(c4iw_class_attributes); ++i)
		device_remove_file(&dev->ibdev.dev,
				   c4iw_class_attributes[i]);
	ib_unregister_device(&dev->ibdev);
	kfree(dev->ibdev.iwcm);
	return;
}