linux-kernel - Re: [PATCH v4 1/1] net: fec: correct the counting of XDP sent frames

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

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@....com>
> Signed-off-by: Shenwei Wang <shenwei.wang@....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