netdev - [RFC net-next 08/10] qede: Add support for link

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Message-ID: <1441893261-6222-9-git-send-email-Yuval.Mintz@qlogic.com>
Date:	Thu, 10 Sep 2015 16:54:19 +0300
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	<netdev@...r.kernel.org>
CC:	<Ariel.Elior@...gic.com>, <Yuval.Mintz@...gic.com>,
	Sudarsana Kalluru <Sudarsana.Kalluru@...gic.com>
Subject: [RFC net-next 08/10] qede: Add support for link

From: Sudarsana Kalluru <Sudarsana.Kalluru@...gic.com>

This adds basic link functionality to qede - driver still doesn't provide
users with an API to change any link property, but it does request qed to
initialize the link using default configuration, and registers a callback
that allows it to get link notifications.

This patch adds the ability of the driver to set the carrier as active and
to enable traffic as a result of async. link notifications.
Following this patch, driver should be capable of running traffic.

Signed-off-by: Sudarsana Kalluru <Sudarsana.Kalluru@...gic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@...gic.com>
---
 drivers/net/ethernet/qlogic/qede/qede_main.c | 47 ++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 93d48d5..9cf636b8 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -86,6 +86,7 @@ static int qede_probe(struct pci_dev *pdev, const struct pci_device_id *id);
 static void qede_remove(struct pci_dev *pdev);
 static int qede_alloc_rx_buffer(struct qede_dev *edev,
 				struct qede_rx_queue *rxq);
+static void qede_link_update(void *dev, struct qed_link_output *link);
 
 static struct pci_driver qede_pci_driver = {
 	.name = "qede",
@@ -94,6 +95,12 @@ static struct pci_driver qede_pci_driver = {
 	.remove = qede_remove,
 };
 
+static struct qed_eth_cb_ops qede_ll_ops = {
+	{
+		.link_update = qede_link_update,
+	},
+};
+
 static int qede_netdev_event(struct notifier_block *this, unsigned long event,
 			     void *ptr)
 {
@@ -1303,6 +1310,8 @@ static int __qede_probe(struct pci_dev *pdev, u32 dp_module, u8 dp_level,
 
 	edev->ops->common->set_id(cdev, edev->ndev->name, DRV_MODULE_VERSION);
 
+	edev->ops->register_ops(cdev, &qede_ll_ops, edev);
+
 	INIT_DELAYED_WORK(&edev->sp_task, qede_sp_task);
 	mutex_init(&edev->qede_lock);
 
@@ -2087,6 +2096,7 @@ enum qede_unload_mode {
 
 static void qede_unload(struct qede_dev *edev, enum qede_unload_mode mode)
 {
+	struct qed_link_params link_params;
 	int rc;
 
 	DP_INFO(edev, "Starting qede unload\n");
@@ -2098,6 +2108,10 @@ static void qede_unload(struct qede_dev *edev, enum qede_unload_mode mode)
 	netif_tx_disable(edev->ndev);
 	netif_carrier_off(edev->ndev);
 
+	/* Reset the link */
+	memset(&link_params, 0, sizeof(link_params));
+	link_params.link_up = false;
+	edev->ops->common->set_link(edev->cdev, &link_params);
 	rc = qede_stop_queues(edev);
 	if (rc) {
 		qede_sync_free_irqs(edev);
@@ -2128,6 +2142,8 @@ enum qede_load_mode {
 
 static int qede_load(struct qede_dev *edev, enum qede_load_mode mode)
 {
+	struct qed_link_params link_params;
+	struct qed_link_output link_output;
 	int			rc;
 
 	DP_INFO(edev, "Starting qede load\n");
@@ -2171,6 +2187,17 @@ static int qede_load(struct qede_dev *edev, enum qede_load_mode mode)
 	mutex_lock(&edev->qede_lock);
 	edev->state = QEDE_STATE_OPEN;
 	mutex_unlock(&edev->qede_lock);
+
+	/* Ask for link-up using current configuration */
+	memset(&link_params, 0, sizeof(link_params));
+	link_params.link_up = true;
+	edev->ops->common->set_link(edev->cdev, &link_params);
+
+	/* Query whether link is already-up */
+	memset(&link_output, 0, sizeof(link_output));
+	edev->ops->common->get_link(edev->cdev, &link_output);
+	qede_link_update(edev, &link_output);
+
 	DP_INFO(edev, "Ending successfully qede load\n");
 
 	return 0;
@@ -2216,6 +2243,26 @@ static int qede_close(struct net_device *ndev)
 	return 0;
 }
 
+static void qede_link_update(void *dev, struct qed_link_output *link)
+{
+	struct qede_dev *edev = dev;
+
+	if (!netif_running(edev->ndev)) {
+		DP_VERBOSE(edev, NETIF_MSG_LINK, "Interface is not running\n");
+		return;
+	}
+
+	if (link->link_up) {
+		DP_NOTICE(edev, "Link is up\n");
+		netif_tx_start_all_queues(edev->ndev);
+		netif_carrier_on(edev->ndev);
+	} else {
+		DP_NOTICE(edev, "Link is down\n");
+		netif_tx_disable(edev->ndev);
+		netif_carrier_off(edev->ndev);
+	}
+}
+
 static int qede_set_mac_addr(struct net_device *ndev, void *p)
 {
 	struct qede_dev *edev = netdev_priv(ndev);
-- 
1.9.3

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