/* QLogic qedr NIC Driver
* Copyright (c) 2015-2017 QLogic Corporation
*
* 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/pci.h>
#include <linux/netdevice.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/qed/qede_rdma.h>
#include "qede.h"
static struct qedr_driver *qedr_drv;
static LIST_HEAD(qedr_dev_list);
static DEFINE_MUTEX(qedr_dev_list_lock);
bool qede_rdma_supported(struct qede_dev *dev)
{
return dev->dev_info.common.rdma_supported;
}
static void _qede_rdma_dev_add(struct qede_dev *edev)
{
if (!qedr_drv)
return;
edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev,
edev->ndev);
}
static int qede_rdma_create_wq(struct qede_dev *edev)
{
INIT_LIST_HEAD(&edev->rdma_info.rdma_event_list);
edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
if (!edev->rdma_info.rdma_wq) {
DP_NOTICE(edev, "qedr: Could not create workqueue\n");
return -ENOMEM;
}
return 0;
}
static void qede_rdma_cleanup_event(struct qede_dev *edev)
{
struct list_head *head = &edev->rdma_info.rdma_event_list;
struct qede_rdma_event_work *event_node;
flush_workqueue(edev->rdma_info.rdma_wq);
while (!list_empty(head)) {
event_node = list_entry(head->next, struct qede_rdma_event_work,
list);
cancel_work_sync(&event_node->work);
list_del(&event_node->list);
kfree(event_node);
}
}
static void qede_rdma_destroy_wq(struct qede_dev *edev)
{
qede_rdma_cleanup_event(edev);
destroy_workqueue(edev->rdma_info.rdma_wq);
}
int qede_rdma_dev_add(struct qede_dev *edev)
{
int rc = 0;
if (qede_rdma_supported(edev)) {
rc = qede_rdma_create_wq(edev);
if (rc)
return rc;
INIT_LIST_HEAD(&edev->rdma_info.entry);
mutex_lock(&qedr_dev_list_lock);
list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
_qede_rdma_dev_add(edev);
mutex_unlock(&qedr_dev_list_lock);
}
return rc;
}
static void _qede_rdma_dev_remove(struct qede_dev *edev)
{
if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
qedr_drv->remove(edev->rdma_info.qedr_dev);
edev->rdma_info.qedr_dev = NULL;
}
void qede_rdma_dev_remove(struct qede_dev *edev)
{
if (!qede_rdma_supported(edev))
return;
qede_rdma_destroy_wq(edev);
mutex_lock(&qedr_dev_list_lock);
_qede_rdma_dev_remove(edev);
list_del(&edev->rdma_info.entry);
mutex_unlock(&qedr_dev_list_lock);
}
static void _qede_rdma_dev_open(struct qede_dev *edev)
{
if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
}
static void qede_rdma_dev_open(struct qede_dev *edev)
{
if (!qede_rdma_supported(edev))
return;
mutex_lock(&qedr_dev_list_lock);
_qede_rdma_dev_open(edev);
mutex_unlock(&qedr_dev_list_lock);
}
static void _qede_rdma_dev_close(struct qede_dev *edev)
{
if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
}
static void qede_rdma_dev_close(struct qede_dev *edev)
{
if (!qede_rdma_supported(edev))
return;
mutex_lock(&qedr_dev_list_lock);
_qede_rdma_dev_close(edev);
mutex_unlock(&qedr_dev_list_lock);
}
static void qede_rdma_dev_shutdown(struct qede_dev *edev)
{
if (!qede_rdma_supported(edev))
return;
mutex_lock(&qedr_dev_list_lock);
if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
mutex_unlock(&qedr_dev_list_lock);
}
int qede_rdma_register_driver(struct qedr_driver *drv)
{
struct qede_dev *edev;
u8 qedr_counter = 0;
mutex_lock(&qedr_dev_list_lock);
if (qedr_drv) {
mutex_unlock(&qedr_dev_list_lock);
return -EINVAL;
}
qedr_drv = drv;
list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
struct net_device *ndev;
qedr_counter++;
_qede_rdma_dev_add(edev);
ndev = edev->ndev;
if (netif_running(ndev) && netif_oper_up(ndev))
_qede_rdma_dev_open(edev);
}
mutex_unlock(&qedr_dev_list_lock);
pr_notice("qedr: discovered and registered %d RDMA funcs\n",
qedr_counter);
return 0;
}
EXPORT_SYMBOL(qede_rdma_register_driver);
void qede_rdma_unregister_driver(struct qedr_driver *drv)
{
struct qede_dev *edev;
mutex_lock(&qedr_dev_list_lock);
list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
if (edev->rdma_info.qedr_dev)
_qede_rdma_dev_remove(edev);
}
qedr_drv = NULL;
mutex_unlock(&qedr_dev_list_lock);
}
EXPORT_SYMBOL(qede_rdma_unregister_driver);
static void qede_rdma_changeaddr(struct qede_dev *edev)
{
if (!qede_rdma_supported(edev))
return;
if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
}
static struct qede_rdma_event_work *
qede_rdma_get_free_event_node(struct qede_dev *edev)
{
struct qede_rdma_event_work *event_node = NULL;
struct list_head *list_node = NULL;
bool found = false;
list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
event_node = list_entry(list_node, struct qede_rdma_event_work,
list);
if (!work_pending(&event_node->work)) {
found = true;
break;
}
}
if (!found) {
event_node = kzalloc(sizeof(*event_node), GFP_KERNEL);
if (!event_node) {
DP_NOTICE(edev,
"qedr: Could not allocate memory for rdma work\n");
return NULL;
}
list_add_tail(&event_node->list,
&edev->rdma_info.rdma_event_list);
}
return event_node;
}
static void qede_rdma_handle_event(struct work_struct *work)
{
struct qede_rdma_event_work *event_node;
enum qede_rdma_event event;
struct qede_dev *edev;
event_node = container_of(work, struct qede_rdma_event_work, work);
event = event_node->event;
edev = event_node->ptr;
switch (event) {
case QEDE_UP:
qede_rdma_dev_open(edev);
break;
case QEDE_DOWN:
qede_rdma_dev_close(edev);
break;
case QEDE_CLOSE:
qede_rdma_dev_shutdown(edev);
break;
case QEDE_CHANGE_ADDR:
qede_rdma_changeaddr(edev);
break;
default:
DP_NOTICE(edev, "Invalid rdma event %d", event);
}
}
static void qede_rdma_add_event(struct qede_dev *edev,
enum qede_rdma_event event)
{
struct qede_rdma_event_work *event_node;
if (!edev->rdma_info.qedr_dev)
return;
event_node = qede_rdma_get_free_event_node(edev);
if (!event_node)
return;
event_node->event = event;
event_node->ptr = edev;
INIT_WORK(&event_node->work, qede_rdma_handle_event);
queue_work(edev->rdma_info.rdma_wq, &event_node->work);
}
void qede_rdma_dev_event_open(struct qede_dev *edev)
{
qede_rdma_add_event(edev, QEDE_UP);
}
void qede_rdma_dev_event_close(struct qede_dev *edev)
{
qede_rdma_add_event(edev, QEDE_DOWN);
}
void qede_rdma_event_changeaddr(struct qede_dev *edev)
{
qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
}
