[ovs-dev] --with-dpdk configure option issue
Ben Pfaff
blp at ovn.org
Wed Jun 1 15:01:13 UTC 2016
On Wed, Jun 01, 2016 at 04:37:24PM +0200, Mauricio Vásquez wrote:
> On Wed, Jun 1, 2016 at 3:29 PM, Bodireddy, Bhanuprakash <
> bhanuprakash.bodireddy at intel.com> wrote:
>
> > >-----Original Message-----
> > >From: Mauricio Vásquez [mailto:mauriciovasquezbernal at gmail.com]
> > >Sent: Wednesday, June 1, 2016 11:17 AM
> > >To: ovs dev <dev at openvswitch.org>
> > >Cc: Bodireddy, Bhanuprakash <bhanuprakash.bodireddy at intel.com>
> > >Subject: --with-dpdk configure option issue
> > >
> > >Dear All,
> > >I noticed that when I run the command
> > >./configure --with-dpdk=$SOME_NON_EXISTING_ENV_VAR
> > >it does not give me an error, somewhere it says:
> > >"checking whether dpdk datapath is enabled... no" but there is not an
> > explicit
> > >error.
> > >I think this behavior should be avoided, an explicit error should be
> > printed to
> > >avoid any possible confusion, as for example when DPDK_BUILD is not set.
> >
> > Thanks for reporting this issue. This is treated more a misconfiguration
> > than a bug. Please see below.
> > The configure script was modified to handle auto discovery of DPDK library
> > if present in standard search paths with ' ./configure --with-dpdk' option.
> > It also handles other valid options as listed below in case (a),(b),(c),
> > (e). All the below options will set string 'with_dpdk' in OVS_CHECK_DPDK
> > function in acinclude.m4.
> >
> > (a) ./configure --with-dpdk=$DPDK_BUILD [
> > $with_dpdk will be a valid $DPDK_BUILD dir]
> > (b) ./configure --with-dpdk=$DPDK_BUILD/install [ $with_dpdk will
> > be a valid $DPDK_BUILD/install dir]
> > (c) ./configure --without-dpdk.
> > [$with_dpdk will be 'no']
> > (d) ./configure --with-dpdk=""
> > [$with_dpdk will be an empty string]
> > (e) ./configure
> > [ $with_dpdk will be an empty string]
> >
> > In case (d), when empty string is passed to --with-dpdk option, it's not
> > known if user has invoked case (d) or case (e). Hence I throw dpdk
> > datapath isn't enabled as part of configuration.
> > i.e "checking whether dpdk datapath is enabled... no".
> >
>
> I had a look at the autotools documentation and I think there is a way to
> distinguish between cases (d) and (e).
>
> What do you think about something like this?
Please go ahead and formally submit it. It's best to fix this.
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