netdev - Re: [PATCH v2 net] net/sched: act_mpls: Add softdep on mpls

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Date:   Tue, 27 Oct 2020 15:51:50 -0600
From:   David Ahern <dsahern@...il.com>
To:     Guillaume Nault <gnault@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Alexander Ovechkin <ovov@...dex-team.ru>
Subject: Re: [PATCH v2 net] net/sched: act_mpls: Add softdep on mpls_gso.ko

On 10/27/20 3:39 PM, Guillaume Nault wrote:
> On Tue, Oct 27, 2020 at 10:28:29AM -0700, Cong Wang wrote:
>> On Mon, Oct 26, 2020 at 4:23 AM Guillaume Nault <gnault@...hat.com> wrote:
>>>
>>> TCA_MPLS_ACT_PUSH and TCA_MPLS_ACT_MAC_PUSH might be used on gso
>>> packets. Such packets will thus require mpls_gso.ko for segmentation.
>>
>> Any reason not to call request_module() at run time?
> 
> So that mpls_gso would be loaded only when initialising the
> TCA_MPLS_ACT_PUSH or TCA_MPLS_ACT_MAC_PUSH modes?
> 
> That could be done, but the dependency on mpls_gso wouldn't be visible
> anymore with modinfo. I don't really mind, I just felt that such
> information could be important for the end user.
> 

I think the explicit dependency via modinfo is better.