netdev - Re: [PATCH net-next v2] netlink: provide an ability to set default extack message

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Date:   Sun, 29 Jan 2023 20:44:43 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Leon Romanovsky <leon@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>, bridge@...ts.linux-foundation.org,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH net-next v2] netlink: provide an ability to set default
 extack message

On 29/01/2023 18:51, Leon Romanovsky wrote:
> In netdev common pattern, extack pointer is forwarded to the drivers
> to be filled with error message. However, the caller can easily
> overwrite the filled message.
> 
> Instead of adding multiple "if (!extack->_msg)" checks before any
> NL_SET_ERR_MSG() call, which appears after call to the driver, let's
> add new macro to common code.
> 
> [1] https://lore.kernel.org/all/Y9Irgrgf3uxOjwUm@unreal
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
> Changelog:
> v2:
>  * Removed () brackets around msg to fix compilation error.
> v1: https://lore.kernel.org/all/d4843760219f20367c27472f084bd8aa729cf321.1674995155.git.leon@kernel.org
>  * Added special *_WEAK() macro instead of embedding same check in
>    NL_SET_ERR_MSG_MOD/NL_SET_ERR_MSG_FMT.
>  * Reuse same macro for XFRM code which triggered this patch.
> v0: https://lore.kernel.org/all/2919eb55e2e9b92265a3ba600afc8137a901ae5f.1674760340.git.leon@kernel.org
> ---
>  include/linux/netlink.h   | 10 ++++++++++
>  net/bridge/br_switchdev.c | 10 ++++------
>  net/dsa/master.c          |  4 +---
>  net/dsa/slave.c           |  4 +---
>  net/xfrm/xfrm_device.c    |  5 ++++-
>  5 files changed, 20 insertions(+), 13 deletions(-)
> 

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>