Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <b9bbe03d801d6224c8cec9700d22cec19346cebf.camel@redhat.com>
Subject: Re: [PATCH net-next v5 2/9] net: marvell: prestera: Add cleanup of
 allocated fib_nodes
From:   Paolo Abeni <pabeni@redhat.com>
To:     Yevhen Orlov <yevhen.orlov@plvision.eu>, netdev@vger.kernel.org
Cc:     Volodymyr Mytnyk <volodymyr.mytnyk@plvision.eu>,
        Taras Chornyi <taras.chornyi@plvision.eu>,
        Mickey Rachamim <mickeyr@marvell.com>,
        Serhiy Pshyk <serhiy.pshyk@plvision.eu>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
        Stephen Hemminger <stephen@networkplumber.org>,
        linux-kernel@vger.kernel.org, Taras Chornyi <tchornyi@marvell.com>,
        Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Date:   Thu, 22 Sep 2022 11:33:09 +0200
In-Reply-To: <20220908225211.31482-3-yevhen.orlov@plvision.eu>
References: <20220908225211.31482-1-yevhen.orlov@plvision.eu>
         <20220908225211.31482-3-yevhen.orlov@plvision.eu>
Content-Type: text/plain; charset="UTF-8"
User-Agent: Evolution 3.42.4 (3.42.4-2.fc35) 
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Precedence: bulk

On Fri, 2022-09-09 at 01:52 +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@marvell.com>
> Signed-off-by: Taras Chornyi <tchornyi@marvell.com>
> Co-developed-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
> Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.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);
> +	}
> +}

You should use instead rhashtable_free_and_destroy(), providing a
callback which just frees the node, without removing it from the hash
table.

The same in the next patch

Cheers,

Paolo