linux/drivers/infiniband/hw/bnxt_re/main.c

/*
 * Broadcom NetXtreme-E RoCE driver.
 *
 * Copyright (c) 2016 - 2017, Broadcom. All rights reserved.  The term
 * Broadcom refers to Broadcom Limited and/or its subsidiaries.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * BSD license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Description: Main component of the bnxt_re driver
 */

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <net/dcbnl.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <linux/if_ether.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_addr.h>

#include "bnxt_ulp.h"
#include "roce_hsi.h"
#include "qplib_res.h"
#include "qplib_sp.h"
#include "qplib_fp.h"
#include "qplib_rcfw.h"
#include "bnxt_re.h"
#include "ib_verbs.h"
#include <rdma/bnxt_re-abi.h>
#include "bnxt.h"
static char version[] =
		BNXT_RE_DESC " v" ROCE_DRV_MODULE_VERSION "\n";

MODULE_AUTHOR("Eddie Wai <eddie.wai@broadcom.com>");
MODULE_DESCRIPTION(BNXT_RE_DESC " Driver");
MODULE_LICENSE("Dual BSD/GPL");

/* globals */
static struct list_head bnxt_re_dev_list = LIST_HEAD_INIT(bnxt_re_dev_list);
/* Mutex to protect the list of bnxt_re devices added */
static DEFINE_MUTEX(bnxt_re_dev_lock);
static struct workqueue_struct *bnxt_re_wq;

/* for handling bnxt_en callbacks later */
static void bnxt_re_stop(void *p)
{
}

static void bnxt_re_start(void *p)
{
}

static void bnxt_re_sriov_config(void *p, int num_vfs)
{
}

static struct bnxt_ulp_ops bnxt_re_ulp_ops = {
	.ulp_async_notifier = NULL,
	.ulp_stop = bnxt_re_stop,
	.ulp_start = bnxt_re_start,
	.ulp_sriov_config = bnxt_re_sriov_config
};

/* RoCE -> Net driver */

/* Driver registration routines used to let the networking driver (bnxt_en)
 * to know that the RoCE driver is now installed
 */
static int bnxt_re_unregister_netdev(struct bnxt_re_dev *rdev, bool lock_wait)
{
	struct bnxt_en_dev *en_dev;
	int rc;

	if (!rdev)
		return -EINVAL;

	en_dev = rdev->en_dev;
	/* Acquire rtnl lock if it is not invokded from netdev event */
	if (lock_wait)
		rtnl_lock();

	rc = en_dev->en_ops->bnxt_unregister_device(rdev->en_dev,
						    BNXT_ROCE_ULP);
	if (lock_wait)
		rtnl_unlock();
	return rc;
}

static int bnxt_re_register_netdev(struct bnxt_re_dev *rdev)
{
	struct bnxt_en_dev *en_dev;
	int rc = 0;

	if (!rdev)
		return -EINVAL;

	en_dev = rdev->en_dev;

	rtnl_lock();
	rc = en_dev->en_ops->bnxt_register_device(en_dev, BNXT_ROCE_ULP,
						  &bnxt_re_ulp_ops, rdev);
	rtnl_unlock();
	return rc;
}

static int bnxt_re_free_msix(struct bnxt_re_dev *rdev, bool lock_wait)
{
	struct bnxt_en_dev *en_dev;
	int rc;

	if (!rdev)
		return -EINVAL;

	en_dev = rdev->en_dev;

	if (lock_wait)
		rtnl_lock();

	rc = en_dev->en_ops->bnxt_free_msix(rdev->en_dev, BNXT_ROCE_ULP);

	if (lock_wait)
		rtnl_unlock();
	return rc;
}

static int bnxt_re_request_msix(struct bnxt_re_dev *rdev)
{
	int rc = 0, num_msix_want = BNXT_RE_MIN_MSIX, num_msix_got;
	struct bnxt_en_dev *en_dev;

	if (!rdev)
		return -EINVAL;

	en_dev = rdev->en_dev;

	rtnl_lock();
	num_msix_got = en_dev->en_ops->bnxt_request_msix(en_dev, BNXT_ROCE_ULP,
							 rdev->msix_entries,
							 num_msix_want);
	if (num_msix_got < BNXT_RE_MIN_MSIX) {
		rc = -EINVAL;
		goto done;
	}
	if (num_msix_got != num_msix_want) {
		dev_warn(rdev_to_dev(rdev),
			 "Requested %d MSI-X vectors, got %d\n",
			 num_msix_want, num_msix_got);
	}
	rdev->num_msix = num_msix_got;
done:
	rtnl_unlock();
	return rc;
}

static void bnxt_re_init_hwrm_hdr(struct bnxt_re_dev *rdev, struct input *hdr,
				  u16 opcd, u16 crid, u16 trid)
{
	hdr->req_type = cpu_to_le16(opcd);
	hdr->cmpl_ring = cpu_to_le16(crid);
	hdr->target_id = cpu_to_le16(trid);
}

static void bnxt_re_fill_fw_msg(struct bnxt_fw_msg *fw_msg, void *msg,
				int msg_len, void *resp, int resp_max_len,
				int timeout)
{
	fw_msg->msg = msg;
	fw_msg->msg_len = msg_len;
	fw_msg->resp = resp;
	fw_msg->resp_max_len = resp_max_len;
	fw_msg->timeout = timeout;
}

static int bnxt_re_net_ring_free(struct bnxt_re_dev *rdev, u16 fw_ring_id,
				 bool lock_wait)
{
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct hwrm_ring_free_input req = {0};
	struct hwrm_ring_free_output resp;
	struct bnxt_fw_msg fw_msg;
	bool do_unlock = false;
	int rc = -EINVAL;

	if (!en_dev)
		return rc;

	memset(&fw_msg, 0, sizeof(fw_msg));
	if (lock_wait) {
		rtnl_lock();
		do_unlock = true;
	}

	bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_RING_FREE, -1, -1);
	req.ring_type = RING_ALLOC_REQ_RING_TYPE_L2_CMPL;
	req.ring_id = cpu_to_le16(fw_ring_id);
	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, BNXT_ROCE_ULP, &fw_msg);
	if (rc)
		dev_err(rdev_to_dev(rdev),
			"Failed to free HW ring:%d :%#x", req.ring_id, rc);
	if (do_unlock)
		rtnl_unlock();
	return rc;
}

static int bnxt_re_net_ring_alloc(struct bnxt_re_dev *rdev, dma_addr_t *dma_arr,
				  int pages, int type, u32 ring_mask,
				  u32 map_index, u16 *fw_ring_id)
{
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct hwrm_ring_alloc_input req = {0};
	struct hwrm_ring_alloc_output resp;
	struct bnxt_fw_msg fw_msg;
	int rc = -EINVAL;

	if (!en_dev)
		return rc;

	memset(&fw_msg, 0, sizeof(fw_msg));
	rtnl_lock();
	bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_RING_ALLOC, -1, -1);
	req.enables = 0;
	req.page_tbl_addr =  cpu_to_le64(dma_arr[0]);
	if (pages > 1) {
		/* Page size is in log2 units */
		req.page_size = BNXT_PAGE_SHIFT;
		req.page_tbl_depth = 1;
	}
	req.fbo = 0;
	/* Association of ring index with doorbell index and MSIX number */
	req.logical_id = cpu_to_le16(map_index);
	req.length = cpu_to_le32(ring_mask + 1);
	req.ring_type = RING_ALLOC_REQ_RING_TYPE_L2_CMPL;
	req.int_mode = RING_ALLOC_REQ_INT_MODE_MSIX;
	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, BNXT_ROCE_ULP, &fw_msg);
	if (!rc)
		*fw_ring_id = le16_to_cpu(resp.ring_id);

	rtnl_unlock();
	return rc;
}

static int bnxt_re_net_stats_ctx_free(struct bnxt_re_dev *rdev,
				      u32 fw_stats_ctx_id, bool lock_wait)
{
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct hwrm_stat_ctx_free_input req = {0};
	struct bnxt_fw_msg fw_msg;
	bool do_unlock = false;
	int rc = -EINVAL;

	if (!en_dev)
		return rc;

	memset(&fw_msg, 0, sizeof(fw_msg));
	if (lock_wait) {
		rtnl_lock();
		do_unlock = true;
	}

	bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_STAT_CTX_FREE, -1, -1);
	req.stat_ctx_id = cpu_to_le32(fw_stats_ctx_id);
	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&req,
			    sizeof(req), DFLT_HWRM_CMD_TIMEOUT);
	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, BNXT_ROCE_ULP, &fw_msg);
	if (rc)
		dev_err(rdev_to_dev(rdev),
			"Failed to free HW stats context %#x", rc);

	if (do_unlock)
		rtnl_unlock();
	return rc;
}

static int bnxt_re_net_stats_ctx_alloc(struct bnxt_re_dev *rdev,
				       dma_addr_t dma_map,
				       u32 *fw_stats_ctx_id)
{
	struct hwrm_stat_ctx_alloc_output resp = {0};
	struct hwrm_stat_ctx_alloc_input req = {0};
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct bnxt_fw_msg fw_msg;
	int rc = -EINVAL;

	*fw_stats_ctx_id = INVALID_STATS_CTX_ID;

	if (!en_dev)
		return rc;

	memset(&fw_msg, 0, sizeof(fw_msg));
	rtnl_lock();

	bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_STAT_CTX_ALLOC, -1, -1);
	req.update_period_ms = cpu_to_le32(1000);
	req.stats_dma_addr = cpu_to_le64(dma_map);
	req.stat_ctx_flags = STAT_CTX_ALLOC_REQ_STAT_CTX_FLAGS_ROCE;
	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, BNXT_ROCE_ULP, &fw_msg);
	if (!rc)
		*fw_stats_ctx_id = le32_to_cpu(resp.stat_ctx_id);

	rtnl_unlock();
	return rc;
}

/* Device */

static bool is_bnxt_re_dev(struct net_device *netdev)
{
	struct ethtool_drvinfo drvinfo;

	if (netdev->ethtool_ops && netdev->ethtool_ops->get_drvinfo) {
		memset(&drvinfo, 0, sizeof(drvinfo));
		netdev->ethtool_ops->get_drvinfo(netdev, &drvinfo);

		if (strcmp(drvinfo.driver, "bnxt_en"))
			return false;
		return true;
	}
	return false;
}

static struct bnxt_re_dev *bnxt_re_from_netdev(struct net_device *netdev)
{
	struct bnxt_re_dev *rdev;

	rcu_read_lock();
	list_for_each_entry_rcu(rdev, &bnxt_re_dev_list, list) {
		if (rdev->netdev == netdev) {
			rcu_read_unlock();
			return rdev;
		}
	}
	rcu_read_unlock();
	return NULL;
}

static void bnxt_re_dev_unprobe(struct net_device *netdev,
				struct bnxt_en_dev *en_dev)
{
	dev_put(netdev);
	module_put(en_dev->pdev->driver->driver.owner);
}

static struct bnxt_en_dev *bnxt_re_dev_probe(struct net_device *netdev)
{
	struct bnxt *bp = netdev_priv(netdev);
	struct bnxt_en_dev *en_dev;
	struct pci_dev *pdev;

	/* Call bnxt_en's RoCE probe via indirect API */
	if (!bp->ulp_probe)
		return ERR_PTR(-EINVAL);

	en_dev = bp->ulp_probe(netdev);
	if (IS_ERR(en_dev))
		return en_dev;

	pdev = en_dev->pdev;
	if (!pdev)
		return ERR_PTR(-EINVAL);

	if (!(en_dev->flags & BNXT_EN_FLAG_ROCE_CAP)) {
		dev_dbg(&pdev->dev,
			"%s: probe error: RoCE is not supported on this device",
			ROCE_DRV_MODULE_NAME);
		return ERR_PTR(-ENODEV);
	}

	/* Bump net device reference count */
	if (!try_module_get(pdev->driver->driver.owner))
		return ERR_PTR(-ENODEV);

	dev_hold(netdev);

	return en_dev;
}

static void bnxt_re_unregister_ib(struct bnxt_re_dev *rdev)
{
	ib_unregister_device(&rdev->ibdev);
}

static int bnxt_re_register_ib(struct bnxt_re_dev *rdev)
{
	struct ib_device *ibdev = &rdev->ibdev;

	/* ib device init */
	ibdev->owner = THIS_MODULE;
	ibdev->node_type = RDMA_NODE_IB_CA;
	strlcpy(ibdev->name, "bnxt_re%d", IB_DEVICE_NAME_MAX);
	strlcpy(ibdev->node_desc, BNXT_RE_DESC " HCA",
		strlen(BNXT_RE_DESC) + 5);
	ibdev->phys_port_cnt = 1;

	bnxt_qplib_get_guid(rdev->netdev->dev_addr, (u8 *)&ibdev->node_guid);

	ibdev->num_comp_vectors	= 1;
	ibdev->dev.parent = &rdev->en_dev->pdev->dev;
	ibdev->local_dma_lkey = BNXT_QPLIB_RSVD_LKEY;

	/* User space */
	ibdev->uverbs_abi_ver = BNXT_RE_ABI_VERSION;
	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_REREG_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_RESIZE_CQ)		|
			(1ull << IB_USER_VERBS_CMD_DESTROY_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_DESTROY_QP)		|
			(1ull << IB_USER_VERBS_CMD_CREATE_SRQ)		|
			(1ull << IB_USER_VERBS_CMD_MODIFY_SRQ)		|
			(1ull << IB_USER_VERBS_CMD_QUERY_SRQ)		|
			(1ull << IB_USER_VERBS_CMD_DESTROY_SRQ)		|
			(1ull << IB_USER_VERBS_CMD_CREATE_AH)		|
			(1ull << IB_USER_VERBS_CMD_MODIFY_AH)		|
			(1ull << IB_USER_VERBS_CMD_QUERY_AH)		|
			(1ull << IB_USER_VERBS_CMD_DESTROY_AH);
	/* POLL_CQ and REQ_NOTIFY_CQ is directly handled in libbnxt_re */

	/* Kernel verbs */
	ibdev->query_device		= bnxt_re_query_device;
	ibdev->modify_device		= bnxt_re_modify_device;

	ibdev->query_port		= bnxt_re_query_port;
	ibdev->get_port_immutable	= bnxt_re_get_port_immutable;
	ibdev->query_pkey		= bnxt_re_query_pkey;
	ibdev->query_gid		= bnxt_re_query_gid;
	ibdev->get_netdev		= bnxt_re_get_netdev;
	ibdev->add_gid			= bnxt_re_add_gid;
	ibdev->del_gid			= bnxt_re_del_gid;
	ibdev->get_link_layer		= bnxt_re_get_link_layer;

	ibdev->alloc_pd			= bnxt_re_alloc_pd;
	ibdev->dealloc_pd		= bnxt_re_dealloc_pd;

	ibdev->create_ah		= bnxt_re_create_ah;
	ibdev->modify_ah		= bnxt_re_modify_ah;
	ibdev->query_ah			= bnxt_re_query_ah;
	ibdev->destroy_ah		= bnxt_re_destroy_ah;

	ibdev->create_qp		= bnxt_re_create_qp;
	ibdev->modify_qp		= bnxt_re_modify_qp;
	ibdev->query_qp			= bnxt_re_query_qp;
	ibdev->destroy_qp		= bnxt_re_destroy_qp;

	ibdev->post_send		= bnxt_re_post_send;
	ibdev->post_recv		= bnxt_re_post_recv;

	ibdev->create_cq		= bnxt_re_create_cq;
	ibdev->destroy_cq		= bnxt_re_destroy_cq;
	ibdev->poll_cq			= bnxt_re_poll_cq;
	ibdev->req_notify_cq		= bnxt_re_req_notify_cq;

	ibdev->get_dma_mr		= bnxt_re_get_dma_mr;
	ibdev->dereg_mr			= bnxt_re_dereg_mr;
	ibdev->alloc_mr			= bnxt_re_alloc_mr;
	ibdev->map_mr_sg		= bnxt_re_map_mr_sg;

	ibdev->reg_user_mr		= bnxt_re_reg_user_mr;
	ibdev->alloc_ucontext		= bnxt_re_alloc_ucontext;
	ibdev->dealloc_ucontext		= bnxt_re_dealloc_ucontext;
	ibdev->mmap			= bnxt_re_mmap;

	return ib_register_device(ibdev, NULL);
}

static ssize_t show_rev(struct device *device, struct device_attribute *attr,
			char *buf)
{
	struct bnxt_re_dev *rdev = to_bnxt_re_dev(device, ibdev.dev);

	return scnprintf(buf, PAGE_SIZE, "0x%x\n", rdev->en_dev->pdev->vendor);
}

static ssize_t show_fw_ver(struct device *device, struct device_attribute *attr,
			   char *buf)
{
	struct bnxt_re_dev *rdev = to_bnxt_re_dev(device, ibdev.dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", rdev->dev_attr.fw_ver);
}

static ssize_t show_hca(struct device *device, struct device_attribute *attr,
			char *buf)
{
	struct bnxt_re_dev *rdev = to_bnxt_re_dev(device, ibdev.dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", rdev->ibdev.node_desc);
}

static DEVICE_ATTR(hw_rev, 0444, show_rev, NULL);
static DEVICE_ATTR(fw_rev, 0444, show_fw_ver, NULL);
static DEVICE_ATTR(hca_type, 0444, show_hca, NULL);

static struct device_attribute *bnxt_re_attributes[] = {
	&dev_attr_hw_rev,
	&dev_attr_fw_rev,
	&dev_attr_hca_type
};

static void bnxt_re_dev_remove(struct bnxt_re_dev *rdev)
{
	dev_put(rdev->netdev);
	rdev->netdev = NULL;

	mutex_lock(&bnxt_re_dev_lock);
	list_del_rcu(&rdev->list);
	mutex_unlock(&bnxt_re_dev_lock);

	synchronize_rcu();
	flush_workqueue(bnxt_re_wq);

	ib_dealloc_device(&rdev->ibdev);
	/* rdev is gone */
}

static struct bnxt_re_dev *bnxt_re_dev_add(struct net_device *netdev,
					   struct bnxt_en_dev *en_dev)
{
	struct bnxt_re_dev *rdev;

	/* Allocate bnxt_re_dev instance here */
	rdev = (struct bnxt_re_dev *)ib_alloc_device(sizeof(*rdev));
	if (!rdev) {
		dev_err(NULL, "%s: bnxt_re_dev allocation failure!",
			ROCE_DRV_MODULE_NAME);
		return NULL;
	}
	/* Default values */
	rdev->netdev = netdev;
	dev_hold(rdev->netdev);
	rdev->en_dev = en_dev;
	rdev->id = rdev->en_dev->pdev->devfn;
	INIT_LIST_HEAD(&rdev->qp_list);
	mutex_init(&rdev->qp_lock);
	atomic_set(&rdev->qp_count, 0);
	atomic_set(&rdev->cq_count, 0);
	atomic_set(&rdev->srq_count, 0);
	atomic_set(&rdev->mr_count, 0);
	atomic_set(&rdev->mw_count, 0);
	rdev->cosq[0] = 0xFFFF;
	rdev->cosq[1] = 0xFFFF;

	mutex_lock(&bnxt_re_dev_lock);
	list_add_tail_rcu(&rdev->list, &bnxt_re_dev_list);
	mutex_unlock(&bnxt_re_dev_lock);
	return rdev;
}

static int bnxt_re_aeq_handler(struct bnxt_qplib_rcfw *rcfw,
			       struct creq_func_event *aeqe)
{
	switch (aeqe->event) {
	case CREQ_FUNC_EVENT_EVENT_TX_WQE_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_TX_DATA_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_RX_WQE_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_RX_DATA_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_CQ_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_TQM_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_CFCQ_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_CFCS_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_CFCC_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_CFCM_ERROR:
		break;
	case CREQ_FUNC_EVENT_EVENT_TIM_ERROR:
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int bnxt_re_cqn_handler(struct bnxt_qplib_nq *nq,
			       struct bnxt_qplib_cq *handle)
{
	struct bnxt_re_cq *cq = container_of(handle, struct bnxt_re_cq,
					     qplib_cq);

	if (!cq) {
		dev_err(NULL, "%s: CQ is NULL, CQN not handled",
			ROCE_DRV_MODULE_NAME);
		return -EINVAL;
	}
	if (cq->ib_cq.comp_handler) {
		/* Lock comp_handler? */
		(*cq->ib_cq.comp_handler)(&cq->ib_cq, cq->ib_cq.cq_context);
	}

	return 0;
}

static void bnxt_re_cleanup_res(struct bnxt_re_dev *rdev)
{
	if (rdev->nq.hwq.max_elements)
		bnxt_qplib_disable_nq(&rdev->nq);

	if (rdev->qplib_res.rcfw)
		bnxt_qplib_cleanup_res(&rdev->qplib_res);
}

static int bnxt_re_init_res(struct bnxt_re_dev *rdev)
{
	int rc = 0;

	bnxt_qplib_init_res(&rdev->qplib_res);

	if (rdev->msix_entries[BNXT_RE_NQ_IDX].vector <= 0)
		return -EINVAL;

	rc = bnxt_qplib_enable_nq(rdev->en_dev->pdev, &rdev->nq,
				  rdev->msix_entries[BNXT_RE_NQ_IDX].vector,
				  rdev->msix_entries[BNXT_RE_NQ_IDX].db_offset,
				  &bnxt_re_cqn_handler,
				  NULL);

	if (rc)
		dev_err(rdev_to_dev(rdev), "Failed to enable NQ: %#x", rc);

	return rc;
}

static void bnxt_re_free_res(struct bnxt_re_dev *rdev, bool lock_wait)
{
	if (rdev->nq.hwq.max_elements) {
		bnxt_re_net_ring_free(rdev, rdev->nq.ring_id, lock_wait);
		bnxt_qplib_free_nq(&rdev->nq);
	}
	if (rdev->qplib_res.dpi_tbl.max) {
		bnxt_qplib_dealloc_dpi(&rdev->qplib_res,
				       &rdev->qplib_res.dpi_tbl,
				       &rdev->dpi_privileged);
	}
	if (rdev->qplib_res.rcfw) {
		bnxt_qplib_free_res(&rdev->qplib_res);
		rdev->qplib_res.rcfw = NULL;
	}
}

static int bnxt_re_alloc_res(struct bnxt_re_dev *rdev)
{
	int rc = 0;

	/* Configure and allocate resources for qplib */
	rdev->qplib_res.rcfw = &rdev->rcfw;
	rc = bnxt_qplib_get_dev_attr(&rdev->rcfw, &rdev->dev_attr);
	if (rc)
		goto fail;

	rc = bnxt_qplib_alloc_res(&rdev->qplib_res, rdev->en_dev->pdev,
				  rdev->netdev, &rdev->dev_attr);
	if (rc)
		goto fail;

	rc = bnxt_qplib_alloc_dpi(&rdev->qplib_res.dpi_tbl,
				  &rdev->dpi_privileged,
				  rdev);
	if (rc)
		goto fail;

	rdev->nq.hwq.max_elements = BNXT_RE_MAX_CQ_COUNT +
				    BNXT_RE_MAX_SRQC_COUNT + 2;
	rc = bnxt_qplib_alloc_nq(rdev->en_dev->pdev, &rdev->nq);
	if (rc) {
		dev_err(rdev_to_dev(rdev),
			"Failed to allocate NQ memory: %#x", rc);
		goto fail;
	}
	rc = bnxt_re_net_ring_alloc
			(rdev, rdev->nq.hwq.pbl[PBL_LVL_0].pg_map_arr,
			 rdev->nq.hwq.pbl[rdev->nq.hwq.level].pg_count,
			 HWRM_RING_ALLOC_CMPL, BNXT_QPLIB_NQE_MAX_CNT - 1,
			 rdev->msix_entries[BNXT_RE_NQ_IDX].ring_idx,
			 &rdev->nq.ring_id);
	if (rc) {
		dev_err(rdev_to_dev(rdev),
			"Failed to allocate NQ ring: %#x", rc);
		goto free_nq;
	}
	return 0;
free_nq:
	bnxt_qplib_free_nq(&rdev->nq);
fail:
	rdev->qplib_res.rcfw = NULL;
	return rc;
}

static void bnxt_re_dispatch_event(struct ib_device *ibdev, struct ib_qp *qp,
				   u8 port_num, enum ib_event_type event)
{
	struct ib_event ib_event;

	ib_event.device = ibdev;
	if (qp)
		ib_event.element.qp = qp;
	else
		ib_event.element.port_num = port_num;
	ib_event.event = event;
	ib_dispatch_event(&ib_event);
}

#define HWRM_QUEUE_PRI2COS_QCFG_INPUT_FLAGS_IVLAN      0x02
static int bnxt_re_query_hwrm_pri2cos(struct bnxt_re_dev *rdev, u8 dir,
				      u64 *cid_map)
{
	struct hwrm_queue_pri2cos_qcfg_input req = {0};
	struct bnxt *bp = netdev_priv(rdev->netdev);
	struct hwrm_queue_pri2cos_qcfg_output resp;
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct bnxt_fw_msg fw_msg;
	u32 flags = 0;
	u8 *qcfgmap, *tmp_map;
	int rc = 0, i;

	if (!cid_map)
		return -EINVAL;

	memset(&fw_msg, 0, sizeof(fw_msg));
	bnxt_re_init_hwrm_hdr(rdev, (void *)&req,
			      HWRM_QUEUE_PRI2COS_QCFG, -1, -1);
	flags |= (dir & 0x01);
	flags |= HWRM_QUEUE_PRI2COS_QCFG_INPUT_FLAGS_IVLAN;
	req.flags = cpu_to_le32(flags);
	req.port_id = bp->pf.port_id;

	bnxt_re_fill_fw_msg(&fw_msg, (void *)&req, sizeof(req), (void *)&resp,
			    sizeof(resp), DFLT_HWRM_CMD_TIMEOUT);
	rc = en_dev->en_ops->bnxt_send_fw_msg(en_dev, BNXT_ROCE_ULP, &fw_msg);
	if (rc)
		return rc;

	if (resp.queue_cfg_info) {
		dev_warn(rdev_to_dev(rdev),
			 "Asymmetric cos queue configuration detected");
		dev_warn(rdev_to_dev(rdev),
			 " on device, QoS may not be fully functional\n");
	}
	qcfgmap = &resp.pri0_cos_queue_id;
	tmp_map = (u8 *)cid_map;
	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
		tmp_map[i] = qcfgmap[i];

	return rc;
}

static bool bnxt_re_is_qp1_or_shadow_qp(struct bnxt_re_dev *rdev,
					struct bnxt_re_qp *qp)
{
	return (qp->ib_qp.qp_type == IB_QPT_GSI) || (qp == rdev->qp1_sqp);
}

static void bnxt_re_dev_stop(struct bnxt_re_dev *rdev)
{
	int mask = IB_QP_STATE;
	struct ib_qp_attr qp_attr;
	struct bnxt_re_qp *qp;

	qp_attr.qp_state = IB_QPS_ERR;
	mutex_lock(&rdev->qp_lock);
	list_for_each_entry(qp, &rdev->qp_list, list) {
		/* Modify the state of all QPs except QP1/Shadow QP */
		if (!bnxt_re_is_qp1_or_shadow_qp(rdev, qp)) {
			if (qp->qplib_qp.state !=
			    CMDQ_MODIFY_QP_NEW_STATE_RESET &&
			    qp->qplib_qp.state !=
			    CMDQ_MODIFY_QP_NEW_STATE_ERR) {
				bnxt_re_dispatch_event(&rdev->ibdev, &qp->ib_qp,
						       1, IB_EVENT_QP_FATAL);
				bnxt_re_modify_qp(&qp->ib_qp, &qp_attr, mask,
						  NULL);
			}
		}
	}
	mutex_unlock(&rdev->qp_lock);
}

static int bnxt_re_update_gid(struct bnxt_re_dev *rdev)
{
	struct bnxt_qplib_sgid_tbl *sgid_tbl = &rdev->qplib_res.sgid_tbl;
	struct bnxt_qplib_gid gid;
	u16 gid_idx, index;
	int rc = 0;

	if (!test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags))
		return 0;

	if (!sgid_tbl) {
		dev_err(rdev_to_dev(rdev), "QPLIB: SGID table not allocated");
		return -EINVAL;
	}

	for (index = 0; index < sgid_tbl->active; index++) {
		gid_idx = sgid_tbl->hw_id[index];

		if (!memcmp(&sgid_tbl->tbl[index], &bnxt_qplib_gid_zero,
			    sizeof(bnxt_qplib_gid_zero)))
			continue;
		/* need to modify the VLAN enable setting of non VLAN GID only
		 * as setting is done for VLAN GID while adding GID
		 */
		if (sgid_tbl->vlan[index])
			continue;

		memcpy(&gid, &sgid_tbl->tbl[index], sizeof(gid));

		rc = bnxt_qplib_update_sgid(sgid_tbl, &gid, gid_idx,
					    rdev->qplib_res.netdev->dev_addr);
	}

	return rc;
}

static u32 bnxt_re_get_priority_mask(struct bnxt_re_dev *rdev)
{
	u32 prio_map = 0, tmp_map = 0;
	struct net_device *netdev;
	struct dcb_app app;

	netdev = rdev->netdev;

	memset(&app, 0, sizeof(app));
	app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
	app.protocol = ETH_P_IBOE;
	tmp_map = dcb_ieee_getapp_mask(netdev, &app);
	prio_map = tmp_map;

	app.selector = IEEE_8021QAZ_APP_SEL_DGRAM;
	app.protocol = ROCE_V2_UDP_DPORT;
	tmp_map = dcb_ieee_getapp_mask(netdev, &app);
	prio_map |= tmp_map;

	return prio_map;
}

static void bnxt_re_parse_cid_map(u8 prio_map, u8 *cid_map, u16 *cosq)
{
	u16 prio;
	u8 id;

	for (prio = 0, id = 0; prio < 8; prio++) {
		if (prio_map & (1 << prio)) {
			cosq[id] = cid_map[prio];
			id++;
			if (id == 2) /* Max 2 tcs supported */
				break;
		}
	}
}

static int bnxt_re_setup_qos(struct bnxt_re_dev *rdev)
{
	u8 prio_map = 0;
	u64 cid_map;
	int rc;

	/* Get priority for roce */
	prio_map = bnxt_re_get_priority_mask(rdev);

	if (prio_map == rdev->cur_prio_map)
		return 0;
	rdev->cur_prio_map = prio_map;
	/* Get cosq id for this priority */
	rc = bnxt_re_query_hwrm_pri2cos(rdev, 0, &cid_map);
	if (rc) {
		dev_warn(rdev_to_dev(rdev), "no cos for p_mask %x\n", prio_map);
		return rc;
	}
	/* Parse CoS IDs for app priority */
	bnxt_re_parse_cid_map(prio_map, (u8 *)&cid_map, rdev->cosq);

	/* Config BONO. */
	rc = bnxt_qplib_map_tc2cos(&rdev->qplib_res, rdev->cosq);
	if (rc) {
		dev_warn(rdev_to_dev(rdev), "no tc for cos{%x, %x}\n",
			 rdev->cosq[0], rdev->cosq[1]);
		return rc;
	}

	/* Actual priorities are not programmed as they are already
	 * done by L2 driver; just enable or disable priority vlan tagging
	 */
	if ((prio_map == 0 && rdev->qplib_res.prio) ||
	    (prio_map != 0 && !rdev->qplib_res.prio)) {
		rdev->qplib_res.prio = prio_map ? true : false;

		bnxt_re_update_gid(rdev);
	}

	return 0;
}

static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev, bool lock_wait)
{
	int i, rc;

	if (test_and_clear_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags)) {
		for (i = 0; i < ARRAY_SIZE(bnxt_re_attributes); i++)
			device_remove_file(&rdev->ibdev.dev,
					   bnxt_re_attributes[i]);
		/* Cleanup ib dev */
		bnxt_re_unregister_ib(rdev);
	}
	if (test_and_clear_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags))
		cancel_delayed_work(&rdev->worker);

	bnxt_re_cleanup_res(rdev);
	bnxt_re_free_res(rdev, lock_wait);

	if (test_and_clear_bit(BNXT_RE_FLAG_RCFW_CHANNEL_EN, &rdev->flags)) {
		rc = bnxt_qplib_deinit_rcfw(&rdev->rcfw);
		if (rc)
			dev_warn(rdev_to_dev(rdev),
				 "Failed to deinitialize RCFW: %#x", rc);
		bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id,
					   lock_wait);
		bnxt_qplib_free_ctx(rdev->en_dev->pdev, &rdev->qplib_ctx);
		bnxt_qplib_disable_rcfw_channel(&rdev->rcfw);
		bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id, lock_wait);
		bnxt_qplib_free_rcfw_channel(&rdev->rcfw);
	}
	if (test_and_clear_bit(BNXT_RE_FLAG_GOT_MSIX, &rdev->flags)) {
		rc = bnxt_re_free_msix(rdev, lock_wait);
		if (rc)
			dev_warn(rdev_to_dev(rdev),
				 "Failed to free MSI-X vectors: %#x", rc);
	}
	if (test_and_clear_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags)) {
		rc = bnxt_re_unregister_netdev(rdev, lock_wait);
		if (rc)
			dev_warn(rdev_to_dev(rdev),
				 "Failed to unregister with netdev: %#x", rc);
	}
}

static void bnxt_re_set_resource_limits(struct bnxt_re_dev *rdev)
{
	u32 i;

	rdev->qplib_ctx.qpc_count = BNXT_RE_MAX_QPC_COUNT;
	rdev->qplib_ctx.mrw_count = BNXT_RE_MAX_MRW_COUNT;
	rdev->qplib_ctx.srqc_count = BNXT_RE_MAX_SRQC_COUNT;
	rdev->qplib_ctx.cq_count = BNXT_RE_MAX_CQ_COUNT;
	for (i = 0; i < MAX_TQM_ALLOC_REQ; i++)
		rdev->qplib_ctx.tqm_count[i] =
		rdev->dev_attr.tqm_alloc_reqs[i];
}

/* worker thread for polling periodic events. Now used for QoS programming*/
static void bnxt_re_worker(struct work_struct *work)
{
	struct bnxt_re_dev *rdev = container_of(work, struct bnxt_re_dev,
						worker.work);

	bnxt_re_setup_qos(rdev);
	schedule_delayed_work(&rdev->worker, msecs_to_jiffies(30000));
}

static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
{
	int i, j, rc;

	/* Registered a new RoCE device instance to netdev */
	rc = bnxt_re_register_netdev(rdev);
	if (rc) {
		pr_err("Failed to register with netedev: %#x\n", rc);
		return -EINVAL;
	}
	set_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags);

	rc = bnxt_re_request_msix(rdev);
	if (rc) {
		pr_err("Failed to get MSI-X vectors: %#x\n", rc);
		rc = -EINVAL;
		goto fail;
	}
	set_bit(BNXT_RE_FLAG_GOT_MSIX, &rdev->flags);

	/* Establish RCFW Communication Channel to initialize the context
	 * memory for the function and all child VFs
	 */
	rc = bnxt_qplib_alloc_rcfw_channel(rdev->en_dev->pdev, &rdev->rcfw,
					   BNXT_RE_MAX_QPC_COUNT);
	if (rc)
		goto fail;

	rc = bnxt_re_net_ring_alloc
			(rdev, rdev->rcfw.creq.pbl[PBL_LVL_0].pg_map_arr,
			 rdev->rcfw.creq.pbl[rdev->rcfw.creq.level].pg_count,
			 HWRM_RING_ALLOC_CMPL, BNXT_QPLIB_CREQE_MAX_CNT - 1,
			 rdev->msix_entries[BNXT_RE_AEQ_IDX].ring_idx,
			 &rdev->rcfw.creq_ring_id);
	if (rc) {
		pr_err("Failed to allocate CREQ: %#x\n", rc);
		goto free_rcfw;
	}
	rc = bnxt_qplib_enable_rcfw_channel
				(rdev->en_dev->pdev, &rdev->rcfw,
				 rdev->msix_entries[BNXT_RE_AEQ_IDX].vector,
				 rdev->msix_entries[BNXT_RE_AEQ_IDX].db_offset,
				 0, &bnxt_re_aeq_handler);
	if (rc) {
		pr_err("Failed to enable RCFW channel: %#x\n", rc);
		goto free_ring;
	}

	rc = bnxt_qplib_get_dev_attr(&rdev->rcfw, &rdev->dev_attr);
	if (rc)
		goto disable_rcfw;
	bnxt_re_set_resource_limits(rdev);

	rc = bnxt_qplib_alloc_ctx(rdev->en_dev->pdev, &rdev->qplib_ctx, 0);
	if (rc) {
		pr_err("Failed to allocate QPLIB context: %#x\n", rc);
		goto disable_rcfw;
	}
	rc = bnxt_re_net_stats_ctx_alloc(rdev,
					 rdev->qplib_ctx.stats.dma_map,
					 &rdev->qplib_ctx.stats.fw_id);
	if (rc) {
		pr_err("Failed to allocate stats context: %#x\n", rc);
		goto free_ctx;
	}

	rc = bnxt_qplib_init_rcfw(&rdev->rcfw, &rdev->qplib_ctx, 0);
	if (rc) {
		pr_err("Failed to initialize RCFW: %#x\n", rc);
		goto free_sctx;
	}
	set_bit(BNXT_RE_FLAG_RCFW_CHANNEL_EN, &rdev->flags);

	/* Resources based on the 'new' device caps */
	rc = bnxt_re_alloc_res(rdev);
	if (rc) {
		pr_err("Failed to allocate resources: %#x\n", rc);
		goto fail;
	}
	rc = bnxt_re_init_res(rdev);
	if (rc) {
		pr_err("Failed to initialize resources: %#x\n", rc);
		goto fail;
	}

	rc = bnxt_re_setup_qos(rdev);
	if (rc)
		pr_info("RoCE priority not yet configured\n");

	INIT_DELAYED_WORK(&rdev->worker, bnxt_re_worker);
	set_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags);
	schedule_delayed_work(&rdev->worker, msecs_to_jiffies(30000));

	/* Register ib dev */
	rc = bnxt_re_register_ib(rdev);
	if (rc) {
		pr_err("Failed to register with IB: %#x\n", rc);
		goto fail;
	}
	dev_info(rdev_to_dev(rdev), "Device registered successfully");
	for (i = 0; i < ARRAY_SIZE(bnxt_re_attributes); i++) {
		rc = device_create_file(&rdev->ibdev.dev,
					bnxt_re_attributes[i]);
		if (rc) {
			dev_err(rdev_to_dev(rdev),
				"Failed to create IB sysfs: %#x", rc);
			/* Must clean up all created device files */
			for (j = 0; j < i; j++)
				device_remove_file(&rdev->ibdev.dev,
						   bnxt_re_attributes[j]);
			bnxt_re_unregister_ib(rdev);
			goto fail;
		}
	}
	set_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags);
	bnxt_re_dispatch_event(&rdev->ibdev, NULL, 1, IB_EVENT_PORT_ACTIVE);
	bnxt_re_dispatch_event(&rdev->ibdev, NULL, 1, IB_EVENT_GID_CHANGE);

	return 0;
free_sctx:
	bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id, true);
free_ctx:
	bnxt_qplib_free_ctx(rdev->en_dev->pdev, &rdev->qplib_ctx);
disable_rcfw:
	bnxt_qplib_disable_rcfw_channel(&rdev->rcfw);
free_ring:
	bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id, true);
free_rcfw:
	bnxt_qplib_free_rcfw_channel(&rdev->rcfw);
fail:
	bnxt_re_ib_unreg(rdev, true);
	return rc;
}

static void bnxt_re_dev_unreg(struct bnxt_re_dev *rdev)
{
	struct bnxt_en_dev *en_dev = rdev->en_dev;
	struct net_device *netdev = rdev->netdev;

	bnxt_re_dev_remove(rdev);

	if (netdev)
		bnxt_re_dev_unprobe(netdev, en_dev);
}

static int bnxt_re_dev_reg(struct bnxt_re_dev **rdev, struct net_device *netdev)
{
	struct bnxt_en_dev *en_dev;
	int rc = 0;

	if (!is_bnxt_re_dev(netdev))
		return -ENODEV;

	en_dev = bnxt_re_dev_probe(netdev);
	if (IS_ERR(en_dev)) {
		if (en_dev != ERR_PTR(-ENODEV))
			pr_err("%s: Failed to probe\n", ROCE_DRV_MODULE_NAME);
		rc = PTR_ERR(en_dev);
		goto exit;
	}
	*rdev = bnxt_re_dev_add(netdev, en_dev);
	if (!*rdev) {
		rc = -ENOMEM;
		bnxt_re_dev_unprobe(netdev, en_dev);
		goto exit;
	}
exit:
	return rc;
}

static void bnxt_re_remove_one(struct bnxt_re_dev *rdev)
{
	pci_dev_put(rdev->en_dev->pdev);
}

/* Handle all deferred netevents tasks */
static void bnxt_re_task(struct work_struct *work)
{
	struct bnxt_re_work *re_work;
	struct bnxt_re_dev *rdev;
	int rc = 0;

	re_work = container_of(work, struct bnxt_re_work, work);
	rdev = re_work->rdev;

	if (re_work->event != NETDEV_REGISTER &&
	    !test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags))
		return;

	switch (re_work->event) {
	case NETDEV_REGISTER:
		rc = bnxt_re_ib_reg(rdev);
		if (rc)
			dev_err(rdev_to_dev(rdev),
				"Failed to register with IB: %#x", rc);
		break;
	case NETDEV_UP:
		bnxt_re_dispatch_event(&rdev->ibdev, NULL, 1,
				       IB_EVENT_PORT_ACTIVE);
		break;
	case NETDEV_DOWN:
		bnxt_re_dev_stop(rdev);
		break;
	case NETDEV_CHANGE:
		if (!netif_carrier_ok(rdev->netdev))
			bnxt_re_dev_stop(rdev);
		else if (netif_carrier_ok(rdev->netdev))
			bnxt_re_dispatch_event(&rdev->ibdev, NULL, 1,
					       IB_EVENT_PORT_ACTIVE);
		break;
	default:
		break;
	}
	kfree(re_work);
}

static void bnxt_re_init_one(struct bnxt_re_dev *rdev)
{
	pci_dev_get(rdev->en_dev->pdev);
}

/*
 * "Notifier chain callback can be invoked for the same chain from
 * different CPUs at the same time".
 *
 * For cases when the netdev is already present, our call to the
 * register_netdevice_notifier() will actually get the rtnl_lock()
 * before sending NETDEV_REGISTER and (if up) NETDEV_UP
 * events.
 *
 * But for cases when the netdev is not already present, the notifier
 * chain is subjected to be invoked from different CPUs simultaneously.
 *
 * This is protected by the netdev_mutex.
 */
static int bnxt_re_netdev_event(struct notifier_block *notifier,
				unsigned long event, void *ptr)
{
	struct net_device *real_dev, *netdev = netdev_notifier_info_to_dev(ptr);
	struct bnxt_re_work *re_work;
	struct bnxt_re_dev *rdev;
	int rc = 0;
	bool sch_work = false;

	real_dev = rdma_vlan_dev_real_dev(netdev);
	if (!real_dev)
		real_dev = netdev;

	rdev = bnxt_re_from_netdev(real_dev);
	if (!rdev && event != NETDEV_REGISTER)
		goto exit;
	if (real_dev != netdev)
		goto exit;

	switch (event) {
	case NETDEV_REGISTER:
		if (rdev)
			break;
		rc = bnxt_re_dev_reg(&rdev, real_dev);
		if (rc == -ENODEV)
			break;
		if (rc) {
			pr_err("Failed to register with the device %s: %#x\n",
			       real_dev->name, rc);
			break;
		}
		bnxt_re_init_one(rdev);
		sch_work = true;
		break;

	case NETDEV_UNREGISTER:
		bnxt_re_ib_unreg(rdev, false);
		bnxt_re_remove_one(rdev);
		bnxt_re_dev_unreg(rdev);
		break;

	default:
		sch_work = true;
		break;
	}
	if (sch_work) {
		/* Allocate for the deferred task */
		re_work = kzalloc(sizeof(*re_work), GFP_ATOMIC);
		if (re_work) {
			re_work->rdev = rdev;
			re_work->event = event;
			re_work->vlan_dev = (real_dev == netdev ?
					     NULL : netdev);
			INIT_WORK(&re_work->work, bnxt_re_task);
			queue_work(bnxt_re_wq, &re_work->work);
		}
	}

exit:
	return NOTIFY_DONE;
}

static struct notifier_block bnxt_re_netdev_notifier = {
	.notifier_call = bnxt_re_netdev_event
};

static int __init bnxt_re_mod_init(void)
{
	int rc = 0;

	pr_info("%s: %s", ROCE_DRV_MODULE_NAME, version);

	bnxt_re_wq = create_singlethread_workqueue("bnxt_re");
	if (!bnxt_re_wq)
		return -ENOMEM;

	INIT_LIST_HEAD(&bnxt_re_dev_list);

	rc = register_netdevice_notifier(&bnxt_re_netdev_notifier);
	if (rc) {
		pr_err("%s: Cannot register to netdevice_notifier",
		       ROCE_DRV_MODULE_NAME);
		goto err_netdev;
	}
	return 0;

err_netdev:
	destroy_workqueue(bnxt_re_wq);

	return rc;
}

static void __exit bnxt_re_mod_exit(void)
{
	unregister_netdevice_notifier(&bnxt_re_netdev_notifier);
	if (bnxt_re_wq)
		destroy_workqueue(bnxt_re_wq);
}

module_init(bnxt_re_mod_init);
module_exit(bnxt_re_mod_exit);