netdev - [PATCH net-next v2 7/9] net: marvell: prestera: add stub handler neighbour events

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Date:   Fri, 22 Jul 2022 01:11:46 +0300
From:   Yevhen Orlov <yevhen.orlov@...ision.eu>
To:     netdev@...r.kernel.org
Cc:     Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org,
        Yevhen Orlov <yevhen.orlov@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Subject: [PATCH net-next v2 7/9] net: marvell: prestera: add stub handler neighbour events

Actual handler will be added in next patches

Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
---
 .../net/ethernet/marvell/prestera/prestera.h  |  1 +
 .../marvell/prestera/prestera_router.c        | 60 +++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera.h b/drivers/net/ethernet/marvell/prestera/prestera.h
index a3a112f5c09e..33a0add529ba 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera.h
+++ b/drivers/net/ethernet/marvell/prestera/prestera.h
@@ -310,6 +310,7 @@ struct prestera_router {
 	struct notifier_block inetaddr_nb;
 	struct notifier_block inetaddr_valid_nb;
 	struct notifier_block fib_nb;
+	struct notifier_block netevent_nb;
 	u8 *nhgrp_hw_state_cache; /* Bitmap cached hw state of nhs */
 	unsigned long nhgrp_hw_cache_kick; /* jiffies */
 };
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index 7e3117399432..e35ab79ba477 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -8,6 +8,7 @@
 #include <net/switchdev.h>
 #include <linux/rhashtable.h>
 #include <net/nexthop.h>
+#include <net/netevent.h>
 
 #include "prestera.h"
 #include "prestera_router_hw.h"
@@ -820,6 +821,57 @@ static int __prestera_router_fib_event(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
+struct prestera_netevent_work {
+	struct work_struct work;
+	struct prestera_switch *sw;
+	struct neighbour *n;
+};
+
+static void prestera_router_neigh_event_work(struct work_struct *work)
+{
+	struct prestera_netevent_work *net_work =
+		container_of(work, struct prestera_netevent_work, work);
+	struct prestera_switch *sw = net_work->sw;
+	struct neighbour *n = net_work->n;
+
+	/* neigh - its not hw related object. It stored only in kernel. So... */
+	rtnl_lock();
+
+	/* TODO: handler */
+
+	neigh_release(n);
+	rtnl_unlock();
+	kfree(net_work);
+}
+
+static int prestera_router_netevent_event(struct notifier_block *nb,
+					  unsigned long event, void *ptr)
+{
+	struct prestera_netevent_work *net_work;
+	struct prestera_router *router;
+	struct neighbour *n = ptr;
+
+	router = container_of(nb, struct prestera_router, netevent_nb);
+
+	switch (event) {
+	case NETEVENT_NEIGH_UPDATE:
+		if (n->tbl->family != AF_INET)
+			return NOTIFY_DONE;
+
+		net_work = kzalloc(sizeof(*net_work), GFP_ATOMIC);
+		if (WARN_ON(!net_work))
+			return NOTIFY_BAD;
+
+		neigh_clone(n);
+		net_work->n = n;
+		net_work->sw = router->sw;
+		INIT_WORK(&net_work->work, prestera_router_neigh_event_work);
+		prestera_queue_work(&net_work->work);
+	}
+
+	return NOTIFY_DONE;
+}
+
 int prestera_router_init(struct prestera_switch *sw)
 {
 	struct prestera_router *router;
@@ -858,6 +910,11 @@ int prestera_router_init(struct prestera_switch *sw)
 	if (err)
 		goto err_register_inetaddr_notifier;
 
+	router->netevent_nb.notifier_call = prestera_router_netevent_event;
+	err = register_netevent_notifier(&router->netevent_nb);
+	if (err)
+		goto err_register_netevent_notifier;
+
 	router->fib_nb.notifier_call = __prestera_router_fib_event;
 	err = register_fib_notifier(&init_net, &router->fib_nb,
 				    /* TODO: flush fib entries */ NULL, NULL);
@@ -867,6 +924,8 @@ int prestera_router_init(struct prestera_switch *sw)
 	return 0;
 
 err_register_fib_notifier:
+	unregister_netevent_notifier(&router->netevent_nb);
+err_register_netevent_notifier:
 	unregister_inetaddr_notifier(&router->inetaddr_nb);
 err_register_inetaddr_notifier:
 	unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
@@ -884,6 +943,7 @@ int prestera_router_init(struct prestera_switch *sw)
 void prestera_router_fini(struct prestera_switch *sw)
 {
 	unregister_fib_notifier(&init_net, &sw->router->fib_nb);
+	unregister_netevent_notifier(&sw->router->netevent_nb);
 	unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
 	unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
 	prestera_queue_drain();
-- 
2.17.1