netdev - Re: [PATCH net-next v6 2/9] net: marvell: prestera: Add cleanup of allocated fib

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Date:   Thu, 22 Sep 2022 12:15:45 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Yevhen Orlov <yevhen.orlov@...ision.eu>, 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>, Andrew Lunn <andrew@...n.ch>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org, Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Subject: Re: [PATCH net-next v6 2/9] net: marvell: prestera: Add cleanup of
 allocated fib_nodes

Hello,
On Sun, 2022-09-18 at 22:46 +0300, Yevhen Orlov wrote:
> Do explicity cleanup on router_hw_fini, to ensure, that all allocated
> objects cleaned. This will be used in cases,
> when upper layer (cache) is not mapped to router_hw layer.
> 
> 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>
> ---
>  .../marvell/prestera/prestera_router_hw.c     | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> index db9d2e9d9904..1b9feb396811 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> @@ -56,6 +56,7 @@ static int prestera_nexthop_group_set(struct prestera_switch *sw,
>  static bool
>  prestera_nexthop_group_util_hw_state(struct prestera_switch *sw,
>  				     struct prestera_nexthop_group *nh_grp);
> +static void prestera_fib_node_destroy_ht(struct prestera_switch *sw);
>  
>  /* TODO: move to router.h as macros */
>  static bool prestera_nh_neigh_key_is_valid(struct prestera_nh_neigh_key *key)
> @@ -97,6 +98,7 @@ int prestera_router_hw_init(struct prestera_switch *sw)
>  
>  void prestera_router_hw_fini(struct prestera_switch *sw)
>  {
> +	prestera_fib_node_destroy_ht(sw);
>  	WARN_ON(!list_empty(&sw->router->vr_list));
>  	WARN_ON(!list_empty(&sw->router->rif_entry_list));
>  	rhashtable_destroy(&sw->router->fib_ht);
> @@ -605,6 +607,27 @@ void prestera_fib_node_destroy(struct prestera_switch *sw,
>  	kfree(fib_node);
>  }
>  
> +static void prestera_fib_node_destroy_ht(struct prestera_switch *sw)
> +{
> +	struct prestera_fib_node *node;
> +	struct rhashtable_iter iter;
> +
> +	while (1) {
> +		rhashtable_walk_enter(&sw->router->fib_ht, &iter);
> +		rhashtable_walk_start(&iter);
> +		node = rhashtable_walk_next(&iter);
> +		rhashtable_walk_stop(&iter);
> +		rhashtable_walk_exit(&iter);
> +
> +		if (!node)
> +			break;
> +		else if (IS_ERR(node))
> +			continue;
> +		else if (node)
> +			prestera_fib_node_destroy(sw, node);
> +	}
> +}
> +
>  struct prestera_fib_node *
>  prestera_fib_node_create(struct prestera_switch *sw,
>  			 struct prestera_fib_key *key,

I commented on v5 due to PEBKAC here, but the comment applies here,
too:

You could use rhashtable_free_and_destroy() with a suitable callback
freeing the node without removing it from the hash table. The same in
the next patch.

Thanks!

Paolo