linux-kernel - Re: [PATCH 1/2] can: netlink: support setting hardware filters

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Date:   Thu, 17 Aug 2023 09:45:29 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Martin Hundebøll <martin@...nix.com>
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] can: netlink: support setting hardware filters

On Thu, 17 Aug 2023 12:10:13 +0200 Martin Hundebøll wrote:
> +		int len = nla_len(data[IFLA_CAN_HW_FILTER]);
> +		int num_filter = len / sizeof(struct can_filter);
> +		struct can_filter *filter = nla_data(data[IFLA_CAN_HW_FILTER]);

This will prevent you from ever extending struct can_filter in 
a backward-compatible fashion, right? I obviously know very little
about CAN but are you confident a more bespoke API to manipulate
filters individually and allow extensibility is not warranted?