netdev - Re: i40e - Is i40e_force_link_state doing the right thing ?

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Message-ID: <CABOGejJLDVATL+XJOfa2dH8u6VefuHWkG_DMMP92Gr8s9fezvg@mail.gmail.com>
Date:   Wed, 16 May 2018 08:35:49 -0700
From:   Chaitanya Lala <chaitanya.lala@...il.com>
To:     "Stachura, Mariusz" <mariusz.stachura@...el.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Williams, Mitch A" <mitch.a.williams@...el.com>,
        "Bowers, AndrewX" <andrewx.bowers@...el.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: i40e - Is i40e_force_link_state doing the right thing ?

Hi Mariusz, ...

On Wed, May 16, 2018 at 12:49 AM, Stachura, Mariusz
<mariusz.stachura@...el.com> wrote:
>> Hi Mariusz, ...
>>
>> On Tue, May 15, 2018 at 2:24 PM, Stachura, Mariusz <mariusz.stachura@...el.com> wrote:
>>> On Tue, May 15, 2018 at 1:15 PM, Chaitanya Lala <chaitanya.lala@...il.com> wrote:
>>>> Hi,
>>>>
>>>> I am trying to bring up a Intel XL710 4x10G Intel card using the
>>>> latest mainline top-of-tree.
>>>> The problem is that "ifconfig up" and "ifconfig down" do not take
>>>> effect at the link state level.
>>>> I tracked the problem down to i40e_force_link_state() when it is
>>>> called from i40e_down().
>>>> It calls i40e_force_link_state with "is_up" == false. In-turn it
>>>> calls, i40e_aq_set_link_restart_an(hw, true, NULL).
>>>>
>>>> Should the second argument of  i40e_aq_set_link_restart_an be "is_up"
>>>> vs the current "true"
>>>> i.e. i40e_aq_set_link_restart_an(hw, is_up, NULL). ? When I make this
>>>> change, the link state syncs-up with the interface administrative
>>>> state.
>>>>
>>>> Is this a bug ?
>>>>
>>>> Thanks,
>>>>  Chaitanya
>>>
>>> Hello Chaitanya,
>>>
>>> i40e_down() calls i40e_force_link_state with "is_up" == false only if interface's private flag "link-down-on-close" is set. By default the link is left up for manageability and VF traffic, user can use this flag to power down the interface on the link level. Does that work for you?
>>> The command is:
>>> "ethtool --set-priv-flags IFNAME link-down-on-close on" and then
>>
>> This flag is _on_ in my setup and hencet i40e_force_link_state is being called with is_up == false in my setup. The problem is that irrespective of value of "is_up" flag, i40e_force_link_state invokes i40e_aq_set_link_restart_an with second argument (enable_link) as "true". So i40e_aq_set_link_restart_an is always trying to enable link even if is_up was false. Is that correct behavior ?
>>
>> I have pasted code with my annotations below marked with "//XXX".
>> (...)
>> Thanks,
>> Chaitanya
>
> Hey,
> i40e_aq_set_link_restart_an has second argument set to "true" intentionally, as I understand the "link-down-on-close" does not work for you, right? I will double check if this feature works for me and get back to you, thank you again.


That's correct. Even with the flag set, if-down does not result in a
link down for me. Thanks for checking!

-
Chaitanya

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