/*
 * Copyright (C) 2005 - 2015 Emulex
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation. The full GNU General
 * Public License is included in this distribution in the file called COPYING.
 *
 * Contact Information:
 * linux-drivers@emulex.com
 *
 * Emulex
 * 3333 Susan Street
 * Costa Mesa, CA 92626
 */

#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/module.h>

#include "be.h"
#include "be_cmds.h"

static struct ocrdma_driver *ocrdma_drv;
static LIST_HEAD(be_adapter_list);
static DEFINE_MUTEX(be_adapter_list_lock);

static void _be_roce_dev_add(struct be_adapter *adapter)
{
	struct be_dev_info dev_info;
	int i, num_vec;
	struct pci_dev *pdev = adapter->pdev;

	if (!ocrdma_drv)
		return;

	if (ocrdma_drv->be_abi_version != BE_ROCE_ABI_VERSION) {
		dev_warn(&pdev->dev, "Cannot initialize RoCE due to ocrdma ABI mismatch\n");
		return;
	}

	if (pdev->device == OC_DEVICE_ID5) {
		/* only msix is supported on these devices */
		if (!msix_enabled(adapter))
			return;
		/* DPP region address and length */
		dev_info.dpp_unmapped_addr = pci_resource_start(pdev, 2);
		dev_info.dpp_unmapped_len = pci_resource_len(pdev, 2);
	} else {
		dev_info.dpp_unmapped_addr = 0;
		dev_info.dpp_unmapped_len = 0;
	}
	dev_info.pdev = adapter->pdev;
	dev_info.db = adapter->db;
	dev_info.unmapped_db = adapter->roce_db.io_addr;
	dev_info.db_page_size = adapter->roce_db.size;
	dev_info.db_total_size = adapter->roce_db.total_size;
	dev_info.netdev = adapter->netdev;
	memcpy(dev_info.mac_addr, adapter->netdev->dev_addr, ETH_ALEN);
	dev_info.dev_family = adapter->sli_family;
	if (msix_enabled(adapter)) {
		/* provide all the vectors, so that EQ creation response
		 * can decide which one to use.
		 */
		num_vec = adapter->num_msix_vec + adapter->num_msix_roce_vec;
		dev_info.intr_mode = BE_INTERRUPT_MODE_MSIX;
		dev_info.msix.num_vectors = min(num_vec, MAX_MSIX_VECTORS);
		/* provide start index of the vector,
		 * so in case of linear usage,
		 * it can use the base as starting point.
		 */
		dev_info.msix.start_vector = adapter->num_evt_qs;
		for (i = 0; i < dev_info.msix.num_vectors; i++) {
			dev_info.msix.vector_list[i] =
			    adapter->msix_entries[i].vector;
		}
	} else {
		dev_info.msix.num_vectors = 0;
		dev_info.intr_mode = BE_INTERRUPT_MODE_INTX;
	}
	adapter->ocrdma_dev = ocrdma_drv->add(&dev_info);
}

void be_roce_dev_add(struct be_adapter *adapter)
{
	if (be_roce_supported(adapter)) {
		INIT_LIST_HEAD(&adapter->entry);
		mutex_lock(&be_adapter_list_lock);
		list_add_tail(&adapter->entry, &be_adapter_list);

		/* invoke add() routine of roce driver only if
		 * valid driver registered with add method and add() is not yet
		 * invoked on a given adapter.
		 */
		_be_roce_dev_add(adapter);
		mutex_unlock(&be_adapter_list_lock);
	}
}

static void _be_roce_dev_remove(struct be_adapter *adapter)
{
	if (ocrdma_drv && ocrdma_drv->remove && adapter->ocrdma_dev)
		ocrdma_drv->remove(adapter->ocrdma_dev);
	adapter->ocrdma_dev = NULL;
}

void be_roce_dev_remove(struct be_adapter *adapter)
{
	if (be_roce_supported(adapter)) {
		mutex_lock(&be_adapter_list_lock);
		_be_roce_dev_remove(adapter);
		list_del(&adapter->entry);
		mutex_unlock(&be_adapter_list_lock);
	}
}

void be_roce_dev_shutdown(struct be_adapter *adapter)
{
	if (be_roce_supported(adapter)) {
		mutex_lock(&be_adapter_list_lock);
		if (ocrdma_drv && adapter->ocrdma_dev &&
		    ocrdma_drv->state_change_handler)
			ocrdma_drv->state_change_handler(adapter->ocrdma_dev,
							 BE_DEV_SHUTDOWN);
		mutex_unlock(&be_adapter_list_lock);
	}
}

int be_roce_register_driver(struct ocrdma_driver *drv)
{
	struct be_adapter *dev;

	mutex_lock(&be_adapter_list_lock);
	if (ocrdma_drv) {
		mutex_unlock(&be_adapter_list_lock);
		return -EINVAL;
	}
	ocrdma_drv = drv;
	list_for_each_entry(dev, &be_adapter_list, entry) {
		struct net_device *netdev;

		_be_roce_dev_add(dev);
		netdev = dev->netdev;
	}
	mutex_unlock(&be_adapter_list_lock);
	return 0;
}
EXPORT_SYMBOL(be_roce_register_driver);

void be_roce_unregister_driver(struct ocrdma_driver *drv)
{
	struct be_adapter *dev;

	mutex_lock(&be_adapter_list_lock);
	list_for_each_entry(dev, &be_adapter_list, entry) {
		if (dev->ocrdma_dev)
			_be_roce_dev_remove(dev);
	}
	ocrdma_drv = NULL;
	mutex_unlock(&be_adapter_list_lock);
}
EXPORT_SYMBOL(be_roce_unregister_driver);