netdev - Re: [PATCH v4] mvneta driver disallow XDP program on hardware buffer management

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Message-ID: <c5bc8e1c-dc0f-6c59-a36e-1b8c5e2d43e9@gmail.com>
Date:   Fri, 24 Jan 2020 10:03:53 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Sven Auhagen <sven.auhagen@...eatech.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "lorenzo.bianconi@...hat.com" <lorenzo.bianconi@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "brouer@...hat.com" <brouer@...hat.com>,
        "ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
        "matteo.croce@...hat.com" <matteo.croce@...hat.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>
Subject: Re: [PATCH v4] mvneta driver disallow XDP program on hardware buffer
 management

On 1/23/20 11:26 PM, Sven Auhagen wrote:
> Recently XDP Support was added to the mvneta driver
> for software buffer management only.
> It is still possible to attach an XDP program if
> hardware buffer management is used.
> It is not doing anything at that point.
> 
> The patch disallows attaching XDP programs to mvneta
> if hardware buffer management is used.
> 
> Signed-off-by: Sven Auhagen <sven.auhagen@...eatech.de>
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index 71a872d46bc4..96593b9fbd9b 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -4225,6 +4225,12 @@ static int mvneta_xdp_setup(struct net_device *dev, struct bpf_prog *prog,
>  		return -EOPNOTSUPP;
>  	}
>  
> +		if (pp->bm_priv) {
> +			NL_SET_ERR_MSG_MOD(extack,
> +					   "Hardware Buffer Management not supported on XDP");
> +			return -EOPNOTSUPP;
> +		}

Your indentation is still a bit off here, looks like you have one too
many tabs. This is what we would expect:

	if (pp->bm_priv) {
	}

> +
>  	need_update = !!pp->xdp_prog != !!prog;
>  	if (running && need_update)
>  		mvneta_stop(dev);
> 


-- 
Florian