netdev - Re: [PATCH net-next v6 10/14] net: ethernet: oa_tc6: implement receive path to receive rx ethernet frames

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Message-ID: <20240819154838.3efa04fa@kernel.org>
Date: Mon, 19 Aug 2024 15:48:38 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: <Parthiban.Veerasooran@...rochip.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <horms@...nel.org>, <saeedm@...dia.com>, <anthony.l.nguyen@...el.com>,
 <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <andrew@...n.ch>,
 <corbet@....net>, <linux-doc@...r.kernel.org>, <robh+dt@...nel.org>,
 <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
 <devicetree@...r.kernel.org>, <Horatiu.Vultur@...rochip.com>,
 <ruanjinjie@...wei.com>, <Steen.Hegelund@...rochip.com>,
 <vladimir.oltean@....com>, <masahiroy@...nel.org>, <alexanderduyck@...com>,
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 <UNGLinuxDriver@...rochip.com>, <Thorsten.Kummermehr@...rochip.com>,
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 <Nicolas.Ferre@...rochip.com>, <benjamin.bigler@...nformulastudent.ch>,
 <linux@...ler.io>, <markku.vorne@...power.com>
Subject: Re: [PATCH net-next v6 10/14] net: ethernet: oa_tc6: implement
 receive path to receive rx ethernet frames

On Mon, 19 Aug 2024 06:53:51 +0000 Parthiban.Veerasooran@...rochip.com
wrote:
> > This is a bit unusual. If the core decides to drop the packet it will
> > count the drop towards the appropriate statistic. The drivers generally
> > only count their own drops, and call netif_rx() without checking the
> > return value.  
>
> The first version of this patch series didn't have this check. There was 
> a comment in the 1st version to check the return value and update the 
> statistics.
> 
> https://lore.kernel.org/lkml/375fa9b4-0fb8-8d4b-8cb5-d8a9240d8f16@huawei.com/
> 
> That was the reason why it was introduced in the v2 of the patch series 
> itself. It seems, somehow it got escaped from your RADAR from v2 to v5 
> :D.

Sorry about that :( There's definitely a gap in terms of reviewing 
the work of reviewers :(

> Sorry, somehow I also missed to check it in the netdev core. Now I 
> understand that the rx drop handled in the core itself in the below link 
> using the function "dev_core_stats_rx_dropped_inc(skb->dev)".
> 
> https://github.com/torvalds/linux/blob/master/net/core/dev.c#L4894
> 
> Is my understanding correct? if so then I will remove this check in the 
> next version.

Yes!