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Date: Tue, 9 May 2023 10:45:02 +0300
From: Leon Romanovsky <leon@kernel.org>
To: Shenwei Wang <shenwei.wang@nxp.com>
Cc: Wei Fang <wei.fang@nxp.com>, "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Clark Wang <xiaoning.wang@nxp.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	imx@lists.linux.dev, Gagandeep Singh <g.singh@nxp.com>
Subject: Re: [PATCH v4 1/1] net: fec: correct the counting of XDP sent frames
Message-ID: <20230509074502.GB38143@unreal>
References: <20230508142931.980196-1-shenwei.wang@nxp.com>
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In-Reply-To: <20230508142931.980196-1-shenwei.wang@nxp.com>

On Mon, May 08, 2023 at 09:29:31AM -0500, Shenwei Wang wrote:
> In the current xdp_xmit implementation, if any single frame fails to
> transmit due to insufficient buffer descriptors, the function nevertheless
> reports success in sending all frames. This results in erroneously
> indicating that frames were transmitted when in fact they were dropped.
> 
> This patch fixes the issue by ensureing the return value properly
> indicates the actual number of frames successfully transmitted, rather than
> potentially reporting success for all frames when some could not transmit.
> 
> Fixes: 6d6b39f180b8 ("net: fec: add initial XDP support")
> Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
> Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
> ---
>  v4:
>   - the tx frame shouldn't be returned when error occurs.
>   - changed the function return values by using the standard errno.
> 
>  v3:
>   - resend the v2 fix for "net" as the standalone patch.
> 
>  v2:
>   - only keep the bug fix part of codes according to Horatiu's comments.
>   - restructure the functions to avoid the forward declaration.
> 
>  drivers/net/ethernet/freescale/fec_main.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

<...>

> -	for (i = 0; i < num_frames; i++)
> -		fec_enet_txq_xmit_frame(fep, txq, frames[i]);
> +	for (i = 0; i < num_frames; i++) {
> +		if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) != 0)
> +			break;
> +		sent_frames++;
> +	}

net-next has commit 6312c685ae0 ("net: fec: correct the counting of XDP sent frames")
which has exactly these lines.

Plus the patch is missing target tree in its subject line.
For example: [PATCH net-next] ...

Thanks