[PATCH net-next v7 3/9] net: marvell: prestera: Add strict cleanup of fib arbiter

From: Yevhen Orlov
Date: Sat Oct 01 2022 - 05:35:27 EST


This will, ensure, that there is no more, preciously allocated fib_cache
entries left after deinit.
Will be used to free allocated resources of nexthop routes, that points
to "not our" port (e.g. eth0).

Signed-off-by: Yevhen Orlov <yevhen.orlov@xxxxxxxxxxx>
---
.../marvell/prestera/prestera_router.c | 42 ++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index a8548b9f9cf1..b4fd8276bbce 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -72,14 +72,21 @@ prestera_kern_fib_cache_find(struct prestera_switch *sw,
return fib_cache;
}

+static void
+__prestera_kern_fib_cache_destruct(struct prestera_switch *sw,
+ struct prestera_kern_fib_cache *fib_cache)
+{
+ fib_info_put(fib_cache->fi);
+}
+
static void
prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
struct prestera_kern_fib_cache *fib_cache)
{
- fib_info_put(fib_cache->fi);
rhashtable_remove_fast(&sw->router->kern_fib_cache_ht,
&fib_cache->ht_node,
__prestera_kern_fib_cache_ht_params);
+ __prestera_kern_fib_cache_destruct(sw, fib_cache);
kfree(fib_cache);
}

@@ -336,6 +343,36 @@ prestera_k_arb_fib_evt(struct prestera_switch *sw,
return 0;
}

+static void __prestera_k_arb_abort_fib_ht_cb(void *ptr, void *arg)
+{
+ struct prestera_kern_fib_cache *fib_cache = ptr;
+ struct prestera_switch *sw = arg;
+
+ __prestera_k_arb_fib_lpm_offload_set(sw, fib_cache,
+ false, false,
+ false);
+ /* No need to destroy lpm.
+ * It will be aborted by destroy_ht
+ */
+ __prestera_kern_fib_cache_destruct(sw, fib_cache);
+ kfree(fib_cache);
+}
+
+static void prestera_k_arb_abort(struct prestera_switch *sw)
+{
+ /* Function to remove all arbiter entries and related hw objects. */
+ /* Sequence:
+ * 1) Clear arbiter tables, but don't touch hw
+ * 2) Clear hw
+ * We use such approach, because arbiter object is not directly mapped
+ * to hw. So deletion of one arbiter object may even lead to creation of
+ * hw object (e.g. in case of overlapped routes).
+ */
+ rhashtable_free_and_destroy(&sw->router->kern_fib_cache_ht,
+ __prestera_k_arb_abort_fib_ht_cb,
+ sw);
+}
+
static int __prestera_inetaddr_port_event(struct net_device *port_dev,
unsigned long event,
struct netlink_ext_ack *extack)
@@ -602,6 +639,9 @@ void prestera_router_fini(struct prestera_switch *sw)
unregister_fib_notifier(&init_net, &sw->router->fib_nb);
unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
+
+ prestera_k_arb_abort(sw);
+
kfree(sw->router->nhgrp_hw_state_cache);
rhashtable_destroy(&sw->router->kern_fib_cache_ht);
prestera_router_hw_fini(sw);
--
2.17.1