1 files changed, 314 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qlogic/qede/qede_rdma.c b/drivers/net/ethernet/qlogic/qede/qede_rdma.c
new file mode 100644
index 000000000000..50b142fad6b8
--- /dev/null
+++ b/drivers/net/ethernet/qlogic/qede/qede_rdma.c
@@ -0,0 +1,314 @@
+/* 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);
+}