linux-kernel - Re: [PATCH net-next] net: fec: implement TSO descriptor cleanup

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Message-ID: <20250116182447.GF6206@kernel.org>
Date: Thu, 16 Jan 2025 18:24:47 +0000
From: Simon Horman <horms@...nel.org>
To: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
Cc: wei.fang@....com, shenwei.wang@....com, xiaoning.wang@....com,
	andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, imx@...ts.linux.dev,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: fec: implement TSO descriptor cleanup

On Thu, Jan 16, 2025 at 06:39:20PM +0530, Dheeraj Reddy Jonnalagadda wrote:
> Implement the TODO in fec_enet_txq_submit_tso() error path to properly
> release buffer descriptors that were allocated during a failed TSO
> operation. This prevents descriptor leaks when TSO operations fail
> partway through.
> 
> The cleanup iterates from the starting descriptor to where the error
> occurred, resetting the status and buffer address fields of each
> descriptor.
> 
> Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index b2daed55bf6c..eff065010c9e 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -913,7 +913,18 @@ static int fec_enet_txq_submit_tso(struct fec_enet_priv_tx_q *txq,
>  	return 0;
>  
>  err_release:
> -	/* TODO: Release all used data descriptors for TSO */
> +	/* Release all used data descriptors for TSO */
> +	struct bufdesc *tmp_bdp = txq->bd.cur;

Hi Dheeraj,

This is not a full review. But variable declarations
should appear at the top of the block they are in,
in this case that would be at the top of the function.

> +
> +	while (tmp_bdp != bdp) {
> +		tmp_bdp->cbd_sc = 0;
> +		tmp_bdp->cbd_bufaddr = 0;
> +		tmp_bdp->cbd_datlen = 0;
> +		tmp_bdp = fec_enet_get_nextdesc(tmp_bdp, &txq->bd);
> +	}
> +
> +	dev_kfree_skb_any(skb);
> +
>  	return ret;
>  }

-- 
pw-bot: changes-requested