netdev - [PATCH net-next 04/12] rocker: Handle SWITCHDEV_PORT_OBJ_ADD/

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Date:   Thu, 22 Nov 2018 23:28:51 +0000
From:   Petr Machata <petrm@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>
CC:     Jiri Pirko <jiri@...lanox.com>, Ido Schimmel <idosch@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ruxandra.radulescu@....com" <ruxandra.radulescu@....com>,
        "ioana.ciornei@....com" <ioana.ciornei@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ivecera@...hat.com" <ivecera@...hat.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>
Subject: [PATCH net-next 04/12] rocker: Handle SWITCHDEV_PORT_OBJ_ADD/_DEL

Following patches will change the way of distributing port object
changes from a switchdev operation to a switchdev notifier. The
switchdev code currently recursively descends through layers of lower
devices, eventually calling the op on a front-panel port device. The
notifier will instead be sent referencing the bridge port device, which
may be a stacking device that's one of front-panel ports uppers, or a
completely unrelated device.

rocker currently doesn't support any uppers other than bridge. Thus the
only case that a stacked device could be validly referenced by port
object notifications are bridge notifications for VLAN objects added to
the bridge itself. But the driver explicitly rejects such notifications
in rocker_world_port_obj_vlan_add(). It is therefore safe to assume that
the only interesting case is that the notification is on a front-panel
port netdevice.

Subscribe to the blocking notifier chain. In the handler, filter out
notifications on any foreign netdevices. Dispatch the new notifiers to
rocker_port_obj_add() resp. _del() to maintain the behavior that the
switchdev operation based code currently has.

Signed-off-by: Petr Machata <petrm@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/rocker/rocker_main.c | 55 +++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
index beb06628f22d..806ffe1d906e 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -2812,12 +2812,54 @@ static int rocker_switchdev_event(struct notifier_block *unused,
 	return NOTIFY_DONE;
 }
 
+static int
+rocker_switchdev_port_obj_event(unsigned long event, struct net_device *netdev,
+			struct switchdev_notifier_port_obj_info *port_obj_info)
+{
+	int err = -EOPNOTSUPP;
+
+	switch (event) {
+	case SWITCHDEV_PORT_OBJ_ADD:
+		err = rocker_port_obj_add(netdev, port_obj_info->obj,
+					  port_obj_info->trans);
+		break;
+	case SWITCHDEV_PORT_OBJ_DEL:
+		err = rocker_port_obj_del(netdev, port_obj_info->obj);
+		break;
+	}
+
+	port_obj_info->handled = true;
+	return notifier_from_errno(err);
+}
+
+static int rocker_switchdev_blocking_event(struct notifier_block *unused,
+					   unsigned long event, void *ptr)
+{
+	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+
+	if (!rocker_port_dev_check(dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case SWITCHDEV_PORT_OBJ_ADD:
+	case SWITCHDEV_PORT_OBJ_DEL:
+		return rocker_switchdev_port_obj_event(event, dev, ptr);
+	}
+
+	return NOTIFY_DONE;
+}
+
 static struct notifier_block rocker_switchdev_notifier = {
 	.notifier_call = rocker_switchdev_event,
 };
 
+static struct notifier_block rocker_switchdev_blocking_notifier = {
+	.notifier_call = rocker_switchdev_blocking_event,
+};
+
 static int rocker_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
+	struct notifier_block *nb;
 	struct rocker *rocker;
 	int err;
 
@@ -2933,6 +2975,13 @@ static int rocker_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_register_switchdev_notifier;
 	}
 
+	nb = &rocker_switchdev_blocking_notifier;
+	err = register_switchdev_blocking_notifier(nb);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to register switchdev blocking notifier\n");
+		goto err_register_switchdev_blocking_notifier;
+	}
+
 	rocker->hw.id = rocker_read64(rocker, SWITCH_ID);
 
 	dev_info(&pdev->dev, "Rocker switch with id %*phN\n",
@@ -2940,6 +2989,8 @@ static int rocker_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	return 0;
 
+err_register_switchdev_blocking_notifier:
+	unregister_switchdev_notifier(&rocker_switchdev_notifier);
 err_register_switchdev_notifier:
 	unregister_fib_notifier(&rocker->fib_nb);
 err_register_fib_notifier:
@@ -2971,6 +3022,10 @@ static int rocker_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 static void rocker_remove(struct pci_dev *pdev)
 {
 	struct rocker *rocker = pci_get_drvdata(pdev);
+	struct notifier_block *nb;
+
+	nb = &rocker_switchdev_blocking_notifier;
+	unregister_switchdev_blocking_notifier(nb);
 
 	unregister_switchdev_notifier(&rocker_switchdev_notifier);
 	unregister_fib_notifier(&rocker->fib_nb);
-- 
2.4.11