netdev - Re: [PATCH 04/15 net-next,v2] net: sched: add tcf_block

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Date:   Fri, 5 Jul 2019 15:58:00 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        davem@...emloft.net, thomas.lendacky@....com, f.fainelli@...il.com,
        ariel.elior@...ium.com, michael.chan@...adcom.com,
        madalin.bucur@....com, yisen.zhuang@...wei.com,
        salil.mehta@...wei.com, jeffrey.t.kirsher@...el.com,
        tariqt@...lanox.com, saeedm@...lanox.com, jiri@...lanox.com,
        idosch@...lanox.com, peppe.cavallaro@...com,
        grygorii.strashko@...com, andrew@...n.ch, vivien.didelot@...il.com,
        alexandre.torgue@...com, joabreu@...opsys.com,
        linux-net-drivers@...arflare.com, ogerlitz@...lanox.com,
        Manish.Chopra@...ium.com, marcelo.leitner@...il.com,
        mkubecek@...e.cz, venkatkumar.duvvuru@...adcom.com,
        maxime.chevallier@...tlin.com, cphealy@...il.com
Subject: Re: [PATCH 04/15 net-next,v2] net: sched: add tcf_block_setup()

On Fri,  5 Jul 2019 01:48:32 +0200, Pablo Neira Ayuso wrote:
> @@ -1052,12 +1145,19 @@ static int tcf_block_offload_cmd(struct tcf_block *block,
>  				 struct netlink_ext_ack *extack)
>  {
>  	struct tc_block_offload bo = {};
> +	int err;
>  
>  	bo.command = command;
>  	bo.binder_type = ei->binder_type;
>  	bo.block = block;
>  	bo.extack = extack;
> -	return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
> +	INIT_LIST_HEAD(&bo.cb_list);
> +
> +	err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
> +	if (err < 0)
> +		return err;
> +
> +	return tcf_block_setup(block, &bo);

If this fails nothing will undo the old ndo call, no?

>  }
>  
>  static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,