/* This file is part of the Emulex RoCE Device Driver for
 * RoCE (RDMA over Converged Ethernet) adapters.
 * Copyright (C) 2012-2015 Emulex. All rights reserved.
 * EMULEX and SLI are trademarks of Emulex.
 * www.emulex.com
 *
 * 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:
 *
 * - 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
 *
 * Contact Information:
 * linux-drivers@emulex.com
 *
 * Emulex
 * 3333 Susan Street
 * Costa Mesa, CA 92626
 */

#include <linux/module.h>
#include <linux/idr.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_mad.h>

#include <linux/netdevice.h>
#include <net/addrconf.h>

#include "ocrdma.h"
#include "ocrdma_verbs.h"
#include "ocrdma_ah.h"
#include "be_roce.h"
#include "ocrdma_hw.h"
#include "ocrdma_stats.h"
#include <rdma/ocrdma-abi.h>

MODULE_DESCRIPTION(OCRDMA_ROCE_DRV_DESC " " OCRDMA_ROCE_DRV_VERSION);
MODULE_AUTHOR("Emulex Corporation");
MODULE_LICENSE("Dual BSD/GPL");

static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device,
					      u32 port_num)
{
	return IB_LINK_LAYER_ETHERNET;
}

static int ocrdma_port_immutable(struct ib_device *ibdev, u32 port_num,
			         struct ib_port_immutable *immutable)
{
	struct ib_port_attr attr;
	struct ocrdma_dev *dev;
	int err;

	dev = get_ocrdma_dev(ibdev);
	immutable->core_cap_flags = RDMA_CORE_PORT_IBA_ROCE;
	if (ocrdma_is_udp_encap_supported(dev))
		immutable->core_cap_flags |= RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP;

	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;
	immutable->max_mad_size = IB_MGMT_MAD_SIZE;

	return 0;
}

static void get_dev_fw_str(struct ib_device *device, char *str)
{
	struct ocrdma_dev *dev = get_ocrdma_dev(device);

	snprintf(str, IB_FW_VERSION_NAME_MAX, "%s", &dev->attr.fw_ver[0]);
}

/* OCRDMA sysfs interface */
static ssize_t hw_rev_show(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct ocrdma_dev *dev =
		rdma_device_to_drv_device(device, struct ocrdma_dev, ibdev);

	return sysfs_emit(buf, "0x%x\n", dev->nic_info.pdev->vendor);
}
static DEVICE_ATTR_RO(hw_rev);

static ssize_t hca_type_show(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct ocrdma_dev *dev =
		rdma_device_to_drv_device(device, struct ocrdma_dev, ibdev);

	return sysfs_emit(buf, "%s\n", &dev->model_number[0]);
}
static DEVICE_ATTR_RO(hca_type);

static struct attribute *ocrdma_attributes[] = {
	&dev_attr_hw_rev.attr,
	&dev_attr_hca_type.attr,
	NULL
};

static const struct attribute_group ocrdma_attr_group = {
	.attrs = ocrdma_attributes,
};

static const struct ib_device_ops ocrdma_dev_ops = {
	.owner = THIS_MODULE,
	.driver_id = RDMA_DRIVER_OCRDMA,
	.uverbs_abi_ver = OCRDMA_ABI_VERSION,

	.alloc_mr = ocrdma_alloc_mr,
	.alloc_pd = ocrdma_alloc_pd,
	.alloc_ucontext = ocrdma_alloc_ucontext,
	.create_ah = ocrdma_create_ah,
	.create_cq = ocrdma_create_cq,
	.create_qp = ocrdma_create_qp,
	.create_user_ah = ocrdma_create_ah,
	.dealloc_pd = ocrdma_dealloc_pd,
	.dealloc_ucontext = ocrdma_dealloc_ucontext,
	.dereg_mr = ocrdma_dereg_mr,
	.destroy_ah = ocrdma_destroy_ah,
	.destroy_cq = ocrdma_destroy_cq,
	.destroy_qp = ocrdma_destroy_qp,
	.device_group = &ocrdma_attr_group,
	.get_dev_fw_str = get_dev_fw_str,
	.get_dma_mr = ocrdma_get_dma_mr,
	.get_link_layer = ocrdma_link_layer,
	.get_port_immutable = ocrdma_port_immutable,
	.map_mr_sg = ocrdma_map_mr_sg,
	.mmap = ocrdma_mmap,
	.modify_qp = ocrdma_modify_qp,
	.poll_cq = ocrdma_poll_cq,
	.post_recv = ocrdma_post_recv,
	.post_send = ocrdma_post_send,
	.process_mad = ocrdma_process_mad,
	.query_ah = ocrdma_query_ah,
	.query_device = ocrdma_query_device,
	.query_pkey = ocrdma_query_pkey,
	.query_port = ocrdma_query_port,
	.query_qp = ocrdma_query_qp,
	.reg_user_mr = ocrdma_reg_user_mr,
	.req_notify_cq = ocrdma_arm_cq,
	.resize_cq = ocrdma_resize_cq,

	INIT_RDMA_OBJ_SIZE(ib_ah, ocrdma_ah, ibah),
	INIT_RDMA_OBJ_SIZE(ib_cq, ocrdma_cq, ibcq),
	INIT_RDMA_OBJ_SIZE(ib_pd, ocrdma_pd, ibpd),
	INIT_RDMA_OBJ_SIZE(ib_qp, ocrdma_qp, ibqp),
	INIT_RDMA_OBJ_SIZE(ib_ucontext, ocrdma_ucontext, ibucontext),
};

static const struct ib_device_ops ocrdma_dev_srq_ops = {
	.create_srq = ocrdma_create_srq,
	.destroy_srq = ocrdma_destroy_srq,
	.modify_srq = ocrdma_modify_srq,
	.post_srq_recv = ocrdma_post_srq_recv,
	.query_srq = ocrdma_query_srq,

	INIT_RDMA_OBJ_SIZE(ib_srq, ocrdma_srq, ibsrq),
};

static int ocrdma_register_device(struct ocrdma_dev *dev)
{
	int ret;

	addrconf_addr_eui48((u8 *)&dev->ibdev.node_guid,
			    dev->nic_info.mac_addr);
	BUILD_BUG_ON(sizeof(OCRDMA_NODE_DESC) > IB_DEVICE_NODE_DESC_MAX);
	memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
	       sizeof(OCRDMA_NODE_DESC));

	dev->ibdev.node_type = RDMA_NODE_IB_CA;
	dev->ibdev.phys_port_cnt = 1;
	dev->ibdev.num_comp_vectors = dev->eq_cnt;

	/* mandatory to support user space verbs consumer. */
	dev->ibdev.dev.parent = &dev->nic_info.pdev->dev;

	ib_set_device_ops(&dev->ibdev, &ocrdma_dev_ops);

	if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R)
		ib_set_device_ops(&dev->ibdev, &ocrdma_dev_srq_ops);

	ret = ib_device_set_netdev(&dev->ibdev, dev->nic_info.netdev, 1);
	if (ret)
		return ret;

	dma_set_max_seg_size(&dev->nic_info.pdev->dev, UINT_MAX);
	return ib_register_device(&dev->ibdev, "ocrdma%d",
				  &dev->nic_info.pdev->dev);
}

static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
{
	mutex_init(&dev->dev_lock);
	dev->cq_tbl = kcalloc(OCRDMA_MAX_CQ, sizeof(struct ocrdma_cq *),
			      GFP_KERNEL);
	if (!dev->cq_tbl)
		goto alloc_err;

	if (dev->attr.max_qp) {
		dev->qp_tbl = kcalloc(OCRDMA_MAX_QP,
				      sizeof(struct ocrdma_qp *),
				      GFP_KERNEL);
		if (!dev->qp_tbl)
			goto alloc_err;
	}

	dev->stag_arr = kcalloc(OCRDMA_MAX_STAG, sizeof(u64), GFP_KERNEL);
	if (dev->stag_arr == NULL)
		goto alloc_err;

	ocrdma_alloc_pd_pool(dev);

	if (!ocrdma_alloc_stats_resources(dev)) {
		pr_err("%s: stats resource allocation failed\n", __func__);
		goto alloc_err;
	}

	spin_lock_init(&dev->av_tbl.lock);
	spin_lock_init(&dev->flush_q_lock);
	return 0;
alloc_err:
	pr_err("%s(%d) error.\n", __func__, dev->id);
	return -ENOMEM;
}

static void ocrdma_free_resources(struct ocrdma_dev *dev)
{
	ocrdma_release_stats_resources(dev);
	kfree(dev->stag_arr);
	kfree(dev->qp_tbl);
	kfree(dev->cq_tbl);
}

static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
{
	int status = 0;
	u8 lstate = 0;
	struct ocrdma_dev *dev;

	dev = ib_alloc_device(ocrdma_dev, ibdev);
	if (!dev) {
		pr_err("Unable to allocate ib device\n");
		return NULL;
	}

	dev->mbx_cmd = kzalloc(sizeof(struct ocrdma_mqe_emb_cmd), GFP_KERNEL);
	if (!dev->mbx_cmd)
		goto init_err;

	memcpy(&dev->nic_info, dev_info, sizeof(*dev_info));
	dev->id = PCI_FUNC(dev->nic_info.pdev->devfn);
	status = ocrdma_init_hw(dev);
	if (status)
		goto init_err;

	status = ocrdma_alloc_resources(dev);
	if (status)
		goto alloc_err;

	ocrdma_init_service_level(dev);
	status = ocrdma_register_device(dev);
	if (status)
		goto alloc_err;

	/* Query Link state and update */
	status = ocrdma_mbx_get_link_speed(dev, NULL, &lstate);
	if (!status)
		ocrdma_update_link_state(dev, lstate);

	/* Init stats */
	ocrdma_add_port_stats(dev);
	/* Interrupt Moderation */
	INIT_DELAYED_WORK(&dev->eqd_work, ocrdma_eqd_set_task);
	schedule_delayed_work(&dev->eqd_work, msecs_to_jiffies(1000));

	pr_info("%s %s: %s \"%s\" port %d\n",
		dev_name(&dev->nic_info.pdev->dev), hca_name(dev),
		port_speed_string(dev), dev->model_number,
		dev->hba_port_num);
	pr_info("%s ocrdma%d driver loaded successfully\n",
		dev_name(&dev->nic_info.pdev->dev), dev->id);
	return dev;

alloc_err:
	ocrdma_free_resources(dev);
	ocrdma_cleanup_hw(dev);
init_err:
	kfree(dev->mbx_cmd);
	ib_dealloc_device(&dev->ibdev);
	pr_err("%s() leaving. ret=%d\n", __func__, status);
	return NULL;
}

static void ocrdma_remove_free(struct ocrdma_dev *dev)
{

	kfree(dev->mbx_cmd);
	ib_dealloc_device(&dev->ibdev);
}

static void ocrdma_remove(struct ocrdma_dev *dev)
{
	/* first unregister with stack to stop all the active traffic
	 * of the registered clients.
	 */
	cancel_delayed_work_sync(&dev->eqd_work);
	ib_unregister_device(&dev->ibdev);

	ocrdma_rem_port_stats(dev);
	ocrdma_free_resources(dev);
	ocrdma_cleanup_hw(dev);
	ocrdma_remove_free(dev);
}

static int ocrdma_dispatch_port_active(struct ocrdma_dev *dev)
{
	struct ib_event port_event;

	port_event.event = IB_EVENT_PORT_ACTIVE;
	port_event.element.port_num = 1;
	port_event.device = &dev->ibdev;
	ib_dispatch_event(&port_event);
	return 0;
}

static int ocrdma_dispatch_port_error(struct ocrdma_dev *dev)
{
	struct ib_event err_event;

	err_event.event = IB_EVENT_PORT_ERR;
	err_event.element.port_num = 1;
	err_event.device = &dev->ibdev;
	ib_dispatch_event(&err_event);
	return 0;
}

static void ocrdma_shutdown(struct ocrdma_dev *dev)
{
	ocrdma_dispatch_port_error(dev);
	ocrdma_remove(dev);
}

/* event handling via NIC driver ensures that all the NIC specific
 * initialization done before RoCE driver notifies
 * event to stack.
 */
static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
{
	switch (event) {
	case BE_DEV_SHUTDOWN:
		ocrdma_shutdown(dev);
		break;
	default:
		break;
	}
}

void ocrdma_update_link_state(struct ocrdma_dev *dev, u8 lstate)
{
	if (!(dev->flags & OCRDMA_FLAGS_LINK_STATUS_INIT)) {
		dev->flags |= OCRDMA_FLAGS_LINK_STATUS_INIT;
		if (!lstate)
			return;
	}

	if (!lstate)
		ocrdma_dispatch_port_error(dev);
	else
		ocrdma_dispatch_port_active(dev);
}

static struct ocrdma_driver ocrdma_drv = {
	.name			= "ocrdma_driver",
	.add			= ocrdma_add,
	.remove			= ocrdma_remove,
	.state_change_handler	= ocrdma_event_handler,
	.be_abi_version		= OCRDMA_BE_ROCE_ABI_VERSION,
};

static int __init ocrdma_init_module(void)
{
	int status;

	ocrdma_init_debugfs();

	status = be_roce_register_driver(&ocrdma_drv);
	if (status)
		goto err_be_reg;

	return 0;

err_be_reg:

	return status;
}

static void __exit ocrdma_exit_module(void)
{
	be_roce_unregister_driver(&ocrdma_drv);
	ocrdma_rem_debugfs();
}

module_init(ocrdma_init_module);
module_exit(ocrdma_exit_module);