netdev - Re: [PATCH RFC net-next 7/7] netdevsim: Add simple FIB resource controller via devlink

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Date:   Sun, 25 Mar 2018 12:53:22 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        roopa@...ulusnetworks.com, shm@...ulusnetworks.com,
        jiri@...lanox.com, idosch@...lanox.com,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH RFC net-next 7/7] netdevsim: Add simple FIB resource
 controller via devlink

On Sun, 25 Mar 2018 08:27:42 -0600, David Ahern wrote:
> On 3/25/18 12:35 AM, Jakub Kicinski wrote:
> > On Sat, 24 Mar 2018 09:02:45 -0600, David Ahern wrote:  
> >>>> diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile
> >>>> index 09388c06171d..449b2a1a1800 100644
> >>>> --- a/drivers/net/netdevsim/Makefile
> >>>> +++ b/drivers/net/netdevsim/Makefile
> >>>> @@ -9,3 +9,7 @@ ifeq ($(CONFIG_BPF_SYSCALL),y)
> >>>>  netdevsim-objs += \
> >>>>  	bpf.o
> >>>>  endif
> >>>> +
> >>>> +ifneq ($(CONFIG_NET_DEVLINK),)    
> >>>
> >>> Hm.  Don't you need MAY_USE_DEVLINK dependency perhaps?    
> >>
> >> mlxsw uses CONFIG_NET_DEVLINK in its Makefile.
> >>
> >> MAY_USE_DEVLINK seems to only be used in Kconfig files. Not clear to me
> >> why it is needed at all.  
> > 
> > NETDEVSIM=y && DEVLINK=m
> >   
> 
> ok. I purposely did not add DEVLINK as a dependency to netdevsim to make
> the resource controller truly optional. Can add it if you prefer.

Oh, no, I don't mind.  I just thought NETDEVSIM=y DEVLINK=m case will
break the build, but I haven't tested.  If it works perfect, let's not
add unnecessary dependencies :)

(FWIW the MAY_USE_DEVLINK dep is basically depend on DEVLINK ||
DEVLINK=n, so one can still build without devlink but if devlink is a
module netdevsim will also have to be.)