linux-kernel - Re: [PATCH net v2] net: ethtool: tsinfo: Fix dump command

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Message-ID: <051c66d5-2751-4dfb-88df-3a4a1f86bb71@linux.dev>
Date: Sat, 8 Mar 2025 09:33:40 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Kory Maincent <kory.maincent@...tlin.com>,
 "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH net v2] net: ethtool: tsinfo: Fix dump command

On 07/03/2025 09:12, Kory Maincent wrote:
> Fix missing initialization of ts_info->phc_index in the dump command,
> which could cause a netdev interface to incorrectly display a PTP provider
> at index 0 instead of "none".
> Fix it by initializing the phc_index to -1.
> 
> In the same time, restore missing initialization of ts_info.cmd for the
> IOCTL case, as it was before the transition from ethnl_default_dumpit to
> custom ethnl_tsinfo_dumpit.
> 
> Also, remove unnecessary zeroing of ts_info, as it is embedded within
> reply_data, which is fully zeroed two lines earlier.
> 
> Fixes: b9e3f7dc9ed95 ("net: ethtool: tsinfo: Enhance tsinfo to support several hwtstamp by net topology")
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> ---
> 
> Change in v2:
> - Remove useless zeroed of ts_info.
> ---
>   net/ethtool/tsinfo.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ethtool/tsinfo.c b/net/ethtool/tsinfo.c
> index 691be6c445b38..ad3866c5a902b 100644
> --- a/net/ethtool/tsinfo.c
> +++ b/net/ethtool/tsinfo.c
> @@ -290,7 +290,8 @@ static void *ethnl_tsinfo_prepare_dump(struct sk_buff *skb,
>   	reply_data = ctx->reply_data;
>   	memset(reply_data, 0, sizeof(*reply_data));
>   	reply_data->base.dev = dev;
> -	memset(&reply_data->ts_info, 0, sizeof(reply_data->ts_info));
> +	reply_data->ts_info.cmd = ETHTOOL_GET_TS_INFO;
> +	reply_data->ts_info.phc_index = -1;
>   
>   	return ehdr;
>   }

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>