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Release 4.11 drivers/net/ethernet/qlogic/qede/qede_roce.c

/* 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_roce.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_roce_supported(struct qede_dev *dev) { return dev->dev_info.common.rdma_supported; }

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static void _qede_roce_dev_add(struct qede_dev *edev) { if (!qedr_drv) return; edev->rdma_info.qedr_dev = qedr_drv->add(edev->cdev, edev->pdev, edev->ndev); }

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static int qede_roce_create_wq(struct qede_dev *edev) { INIT_LIST_HEAD(&edev->rdma_info.roce_event_list); edev->rdma_info.roce_wq = create_singlethread_workqueue("roce_wq"); if (!edev->rdma_info.roce_wq) { DP_NOTICE(edev, "qedr: Could not create workqueue\n"); return -ENOMEM; } return 0; }

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static void qede_roce_cleanup_event(struct qede_dev *edev) { struct list_head *head = &edev->rdma_info.roce_event_list; struct qede_roce_event_work *event_node; flush_workqueue(edev->rdma_info.roce_wq); while (!list_empty(head)) { event_node = list_entry(head->next, struct qede_roce_event_work, list); cancel_work_sync(&event_node->work); list_del(&event_node->list); kfree(event_node); } }

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static void qede_roce_destroy_wq(struct qede_dev *edev) { qede_roce_cleanup_event(edev); destroy_workqueue(edev->rdma_info.roce_wq); }

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int qede_roce_dev_add(struct qede_dev *edev) { int rc = 0; if (qede_roce_supported(edev)) { rc = qede_roce_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_roce_dev_add(edev); mutex_unlock(&qedr_dev_list_lock); } return rc; }

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static void _qede_roce_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; }

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void qede_roce_dev_remove(struct qede_dev *edev) { if (!qede_roce_supported(edev)) return; qede_roce_destroy_wq(edev); mutex_lock(&qedr_dev_list_lock); _qede_roce_dev_remove(edev); list_del(&edev->rdma_info.entry); mutex_unlock(&qedr_dev_list_lock); }

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static void _qede_roce_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); }

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static void qede_roce_dev_open(struct qede_dev *edev) { if (!qede_roce_supported(edev)) return; mutex_lock(&qedr_dev_list_lock); _qede_roce_dev_open(edev); mutex_unlock(&qedr_dev_list_lock); }

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static void _qede_roce_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); }

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static void qede_roce_dev_close(struct qede_dev *edev) { if (!qede_roce_supported(edev)) return; mutex_lock(&qedr_dev_list_lock); _qede_roce_dev_close(edev); mutex_unlock(&qedr_dev_list_lock); }

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static void qede_roce_dev_shutdown(struct qede_dev *edev) { if (!qede_roce_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); }

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int qede_roce_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_roce_dev_add(edev); ndev = edev->ndev; if (netif_running(ndev) && netif_oper_up(ndev)) _qede_roce_dev_open(edev); } mutex_unlock(&qedr_dev_list_lock); pr_notice("qedr: discovered and registered %d RoCE funcs\n", qedr_counter); return 0; }

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EXPORT_SYMBOL(qede_roce_register_driver);
void qede_roce_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_roce_dev_remove(edev); } qedr_drv = NULL; mutex_unlock(&qedr_dev_list_lock); }

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EXPORT_SYMBOL(qede_roce_unregister_driver);
static void qede_roce_changeaddr(struct qede_dev *edev) { if (!qede_roce_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); }

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struct qede_roce_event_work *qede_roce_get_free_event_node(struct qede_dev *edev) { struct qede_roce_event_work *event_node = NULL; struct list_head *list_node = NULL; bool found = false; list_for_each(list_node, &edev->rdma_info.roce_event_list) { event_node = list_entry(list_node, struct qede_roce_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 roce work\n"); return NULL; } list_add_tail(&event_node->list, &edev->rdma_info.roce_event_list); } return event_node; }

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static void qede_roce_handle_event(struct work_struct *work) { struct qede_roce_event_work *event_node; enum qede_roce_event event; struct qede_dev *edev; event_node = container_of(work, struct qede_roce_event_work, work); event = event_node->event; edev = event_node->ptr; switch (event) { case QEDE_UP: qede_roce_dev_open(edev); break; case QEDE_DOWN: qede_roce_dev_close(edev); break; case QEDE_CLOSE: qede_roce_dev_shutdown(edev); break; case QEDE_CHANGE_ADDR: qede_roce_changeaddr(edev); break; default: DP_NOTICE(edev, "Invalid roce event %d", event); } }

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static void qede_roce_add_event(struct qede_dev *edev, enum qede_roce_event event) { struct qede_roce_event_work *event_node; if (!edev->rdma_info.qedr_dev) return; event_node = qede_roce_get_free_event_node(edev); if (!event_node) return; event_node->event = event; event_node->ptr = edev; INIT_WORK(&event_node->work, qede_roce_handle_event); queue_work(edev->rdma_info.roce_wq, &event_node->work); }

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void qede_roce_dev_event_open(struct qede_dev *edev) { qede_roce_add_event(edev, QEDE_UP); }

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void qede_roce_dev_event_close(struct qede_dev *edev) { qede_roce_add_event(edev, QEDE_DOWN); }

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void qede_roce_event_changeaddr(struct qede_dev *edev) { qede_roce_add_event(edev, QEDE_CHANGE_ADDR); }

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