342 lines
8.6 KiB
C
342 lines
8.6 KiB
C
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/* QLogic qedr NIC Driver
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* Copyright (c) 2015-2017 QLogic Corporation
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and /or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/pci.h>
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#include <linux/netdevice.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/qed/qede_rdma.h>
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#include "qede.h"
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static struct qedr_driver *qedr_drv;
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static LIST_HEAD(qedr_dev_list);
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static DEFINE_MUTEX(qedr_dev_list_lock);
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bool qede_rdma_supported(struct qede_dev *dev)
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{
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return dev->dev_info.common.rdma_supported;
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}
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static void _qede_rdma_dev_add(struct qede_dev *edev)
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{
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if (!qedr_drv)
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return;
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edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev,
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edev->ndev);
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}
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static int qede_rdma_create_wq(struct qede_dev *edev)
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{
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INIT_LIST_HEAD(&edev->rdma_info.rdma_event_list);
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kref_init(&edev->rdma_info.refcnt);
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init_completion(&edev->rdma_info.event_comp);
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edev->rdma_info.rdma_wq = create_singlethread_workqueue("rdma_wq");
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if (!edev->rdma_info.rdma_wq) {
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DP_NOTICE(edev, "qedr: Could not create workqueue\n");
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return -ENOMEM;
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}
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return 0;
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}
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static void qede_rdma_cleanup_event(struct qede_dev *edev)
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{
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struct list_head *head = &edev->rdma_info.rdma_event_list;
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struct qede_rdma_event_work *event_node;
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flush_workqueue(edev->rdma_info.rdma_wq);
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while (!list_empty(head)) {
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event_node = list_entry(head->next, struct qede_rdma_event_work,
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list);
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cancel_work_sync(&event_node->work);
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list_del(&event_node->list);
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kfree(event_node);
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}
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}
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static void qede_rdma_complete_event(struct kref *ref)
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{
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struct qede_rdma_dev *rdma_dev =
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container_of(ref, struct qede_rdma_dev, refcnt);
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/* no more events will be added after this */
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complete(&rdma_dev->event_comp);
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}
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static void qede_rdma_destroy_wq(struct qede_dev *edev)
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{
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/* Avoid race with add_event flow, make sure it finishes before
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* we start accessing the list and cleaning up the work
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*/
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kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
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wait_for_completion(&edev->rdma_info.event_comp);
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qede_rdma_cleanup_event(edev);
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destroy_workqueue(edev->rdma_info.rdma_wq);
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}
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int qede_rdma_dev_add(struct qede_dev *edev)
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{
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int rc = 0;
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if (qede_rdma_supported(edev)) {
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rc = qede_rdma_create_wq(edev);
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if (rc)
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return rc;
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INIT_LIST_HEAD(&edev->rdma_info.entry);
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mutex_lock(&qedr_dev_list_lock);
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list_add_tail(&edev->rdma_info.entry, &qedr_dev_list);
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_qede_rdma_dev_add(edev);
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mutex_unlock(&qedr_dev_list_lock);
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}
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return rc;
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}
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static void _qede_rdma_dev_remove(struct qede_dev *edev)
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{
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if (qedr_drv && qedr_drv->remove && edev->rdma_info.qedr_dev)
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qedr_drv->remove(edev->rdma_info.qedr_dev);
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edev->rdma_info.qedr_dev = NULL;
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}
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void qede_rdma_dev_remove(struct qede_dev *edev)
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{
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if (!qede_rdma_supported(edev))
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return;
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qede_rdma_destroy_wq(edev);
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mutex_lock(&qedr_dev_list_lock);
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_qede_rdma_dev_remove(edev);
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list_del(&edev->rdma_info.entry);
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mutex_unlock(&qedr_dev_list_lock);
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}
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static void _qede_rdma_dev_open(struct qede_dev *edev)
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{
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if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
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qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_UP);
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}
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static void qede_rdma_dev_open(struct qede_dev *edev)
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{
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if (!qede_rdma_supported(edev))
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return;
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mutex_lock(&qedr_dev_list_lock);
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_qede_rdma_dev_open(edev);
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mutex_unlock(&qedr_dev_list_lock);
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}
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static void _qede_rdma_dev_close(struct qede_dev *edev)
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{
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if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
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qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_DOWN);
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}
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static void qede_rdma_dev_close(struct qede_dev *edev)
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{
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if (!qede_rdma_supported(edev))
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return;
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mutex_lock(&qedr_dev_list_lock);
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_qede_rdma_dev_close(edev);
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mutex_unlock(&qedr_dev_list_lock);
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}
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static void qede_rdma_dev_shutdown(struct qede_dev *edev)
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{
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if (!qede_rdma_supported(edev))
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return;
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mutex_lock(&qedr_dev_list_lock);
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if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
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qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CLOSE);
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mutex_unlock(&qedr_dev_list_lock);
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}
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int qede_rdma_register_driver(struct qedr_driver *drv)
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{
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struct qede_dev *edev;
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u8 qedr_counter = 0;
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mutex_lock(&qedr_dev_list_lock);
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if (qedr_drv) {
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mutex_unlock(&qedr_dev_list_lock);
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return -EINVAL;
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}
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qedr_drv = drv;
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list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
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struct net_device *ndev;
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qedr_counter++;
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_qede_rdma_dev_add(edev);
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ndev = edev->ndev;
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if (netif_running(ndev) && netif_oper_up(ndev))
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_qede_rdma_dev_open(edev);
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}
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mutex_unlock(&qedr_dev_list_lock);
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pr_notice("qedr: discovered and registered %d RDMA funcs\n",
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qedr_counter);
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return 0;
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}
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EXPORT_SYMBOL(qede_rdma_register_driver);
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void qede_rdma_unregister_driver(struct qedr_driver *drv)
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{
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struct qede_dev *edev;
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mutex_lock(&qedr_dev_list_lock);
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list_for_each_entry(edev, &qedr_dev_list, rdma_info.entry) {
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if (edev->rdma_info.qedr_dev)
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_qede_rdma_dev_remove(edev);
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}
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qedr_drv = NULL;
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mutex_unlock(&qedr_dev_list_lock);
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}
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EXPORT_SYMBOL(qede_rdma_unregister_driver);
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static void qede_rdma_changeaddr(struct qede_dev *edev)
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{
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if (!qede_rdma_supported(edev))
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return;
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if (qedr_drv && edev->rdma_info.qedr_dev && qedr_drv->notify)
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qedr_drv->notify(edev->rdma_info.qedr_dev, QEDE_CHANGE_ADDR);
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}
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static struct qede_rdma_event_work *
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qede_rdma_get_free_event_node(struct qede_dev *edev)
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{
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struct qede_rdma_event_work *event_node = NULL;
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struct list_head *list_node = NULL;
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bool found = false;
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list_for_each(list_node, &edev->rdma_info.rdma_event_list) {
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event_node = list_entry(list_node, struct qede_rdma_event_work,
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list);
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if (!work_pending(&event_node->work)) {
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found = true;
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break;
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}
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}
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if (!found) {
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event_node = kzalloc(sizeof(*event_node), GFP_ATOMIC);
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if (!event_node) {
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DP_NOTICE(edev,
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"qedr: Could not allocate memory for rdma work\n");
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return NULL;
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}
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list_add_tail(&event_node->list,
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&edev->rdma_info.rdma_event_list);
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}
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return event_node;
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}
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static void qede_rdma_handle_event(struct work_struct *work)
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{
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struct qede_rdma_event_work *event_node;
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enum qede_rdma_event event;
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struct qede_dev *edev;
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event_node = container_of(work, struct qede_rdma_event_work, work);
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event = event_node->event;
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edev = event_node->ptr;
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switch (event) {
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case QEDE_UP:
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qede_rdma_dev_open(edev);
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break;
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case QEDE_DOWN:
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qede_rdma_dev_close(edev);
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break;
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case QEDE_CLOSE:
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qede_rdma_dev_shutdown(edev);
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break;
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case QEDE_CHANGE_ADDR:
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qede_rdma_changeaddr(edev);
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break;
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default:
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DP_NOTICE(edev, "Invalid rdma event %d", event);
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}
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}
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static void qede_rdma_add_event(struct qede_dev *edev,
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enum qede_rdma_event event)
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{
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struct qede_rdma_event_work *event_node;
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if (!edev->rdma_info.qedr_dev)
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return;
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/* We don't want the cleanup flow to start while we're allocating and
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* scheduling the work
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*/
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if (!kref_get_unless_zero(&edev->rdma_info.refcnt))
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return; /* already being destroyed */
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event_node = qede_rdma_get_free_event_node(edev);
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if (!event_node)
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goto out;
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event_node->event = event;
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event_node->ptr = edev;
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INIT_WORK(&event_node->work, qede_rdma_handle_event);
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queue_work(edev->rdma_info.rdma_wq, &event_node->work);
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out:
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kref_put(&edev->rdma_info.refcnt, qede_rdma_complete_event);
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}
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void qede_rdma_dev_event_open(struct qede_dev *edev)
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{
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qede_rdma_add_event(edev, QEDE_UP);
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}
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void qede_rdma_dev_event_close(struct qede_dev *edev)
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{
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qede_rdma_add_event(edev, QEDE_DOWN);
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}
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void qede_rdma_event_changeaddr(struct qede_dev *edev)
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{
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qede_rdma_add_event(edev, QEDE_CHANGE_ADDR);
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}
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