netdev - Re: [Patch net-next] act_mirred: use tcfm_dev in tcf_mirred_get

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Message-ID: <CAM_iQpV76SAC7DEoUNj+VfUsRaDtOsoCj+bA6Oqe8sqb1ydgYw@mail.gmail.com>
Date:   Fri, 1 Dec 2017 13:46:42 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [Patch net-next] act_mirred: use tcfm_dev in tcf_mirred_get_dev()

On Fri, Dec 1, 2017 at 9:56 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>
> Isn't this here so user may specify a ifindex of netdev which is not yet
> present on the system (not sure how much sense that would make though...)

How is this even possible? If an ifindex is not present, we return ENODEV:

        if (parm->ifindex) {
                dev = __dev_get_by_index(net, parm->ifindex);
                if (dev == NULL) {
                        if (exists)
                                tcf_idr_release(*a, bind);
                        return -ENODEV;
                }