// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
/* QLogic qedr NIC Driver
* Copyright (c) 2015-2017 QLogic Corporation
* Copyright (c) 2019-2020 Marvell International Ltd.
*/
#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;
/* Leftovers from previous error recovery */
edev->rdma_info.exp_recovery = false;
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);
kref_init(&edev->rdma_info.refcnt);
init_completion(&edev->rdma_info.event_comp);
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_complete_event(struct kref *ref)
{
struct qede_rdma_dev *rdma_dev =
container_of(ref, struct qede_rdma_dev, refcnt);
/* no more events will be added after this */
complete(&rdma_dev->event_comp);
}
static void qede_rdma_destroy_wq(struct qede_dev *edev)
{
/* Avoid race with add_event flow, make sure it finishes before
* we start accessing the list and cleaning up the work
*/
kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
wait_for_completion(&edev->rdma_info.event_comp);
qede_rdma_cleanup_event(edev);
destroy_workqueue(edev->rdma_info.rdma_wq);
edev->rdma_info.rdma_wq = NULL;
}
int qede_rdma_dev_add(struct qede_dev *edev, bool recovery)
{
int rc;
if (!qede_rdma_supported(edev))
return 0;
/* Cannot start qedr while recovering since it wasn't fully stopped */
if (recovery)
return 0;
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);
}
void qede_rdma_dev_remove(struct qede_dev *edev, bool recovery)
{
if (!qede_rdma_supported(edev))
return;
/* Cannot remove qedr while recovering since it wasn't fully stopped */
if (!recovery) {
qede_rdma_destroy_wq(edev);
mutex_lock(&qedr_dev_list_lock);
if (!edev->rdma_info.exp_recovery)
_qede_rdma_dev_remove(edev);
edev->rdma_info.qedr_dev = NULL;
list_del(&edev->rdma_info.entry);
mutex_unlock(&qedr_dev_list_lock);
} else {
if (!edev->rdma_info.exp_recovery) {
mutex_lock(&qedr_dev_list_lock);
_qede_rdma_dev_remove(edev);
mutex_unlock(&qedr_dev_list_lock);
}
edev->rdma_info.exp_recovery = true;
}
}
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 device has experienced recovery it was already removed */
if (edev->rdma_info.qedr_dev && !edev->rdma_info.exp_recovery)
_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 void qede_rdma_change_mtu(struct qede_dev *edev)
{
if (qede_rdma_supported(edev)) {
if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
qedr_drv->notify(edev->rdma_info.qedr_dev,
QEDE_CHANGE_MTU);
}
}
static struct qede_rdma_event_work *
qede_rdma_get_free_event_node(struct qede_dev *edev)
{
struct qede_rdma_event_work *event_node = NULL;
bool found = false;
list_for_each_entry(event_node, &edev->rdma_info.rdma_event_list,
list) {
if (!work_pending(&event_node->work)) {
found = true;
break;
}
}
if (!found) {
event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
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;
case QEDE_CHANGE_MTU:
qede_rdma_change_mtu(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 a recovery was experienced avoid adding the event */
if (edev->rdma_info.exp_recovery)
return;
if (!edev->rdma_info.qedr_dev || !edev->rdma_info.rdma_wq)
return;
/* We don't want the cleanup flow to start while we're allocating and
* scheduling the work
*/
if (!kref_get_unless_zero(&edev->rdma_info.refcnt))
return; /* already being destroyed */
event_node = qede_rdma_get_free_event_node(edev);
if (!event_node)
goto out;
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);
out:
kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
}
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);
}
void qede_rdma_event_change_mtu(struct qede_dev *edev)
{
qede_rdma_add_event(edev, QEDE_CHANGE_MTU);
}
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