Re: [dpdk-dev] [PATCH v5 1/4] lib/rcu: add resource reclamation APIs

[David Marchand <david.marchand@redhat.com>]

On Wed, Apr 22, 2020 at 10:37 AM Ananyev, Konstantin
<konstantin.ananyev@intel.com> wrote:
>
> > Add resource reclamation APIs to make it simple for applications
> > and libraries to integrate rte_rcu library.
> >
> > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > Reviewed-by: Ola Liljedhal <ola.liljedhal@arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> > ---
> >  lib/librte_rcu/Makefile            |   2 +-
> >  lib/librte_rcu/meson.build         |   7 +
> >  lib/librte_rcu/rcu_qsbr_pvt.h      |  66 +++++++++
> >  lib/librte_rcu/rte_rcu_qsbr.c      | 227 ++++++++++++++++++++++++++++-
> >  lib/librte_rcu/rte_rcu_qsbr.h      | 194 +++++++++++++++++++++++-
> >  lib/librte_rcu/rte_rcu_version.map |   4 +
> >  lib/meson.build                    |   6 +-
> >  7 files changed, 501 insertions(+), 5 deletions(-)
> >  create mode 100644 lib/librte_rcu/rcu_qsbr_pvt.h
> >
> > diff --git a/lib/librte_rcu/Makefile b/lib/librte_rcu/Makefile
> > index 728669975..553bca2ef 100644
> > --- a/lib/librte_rcu/Makefile
> > +++ b/lib/librte_rcu/Makefile
> > @@ -7,7 +7,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
> >  LIB = librte_rcu.a
> >
> >  CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3
> > -LDLIBS += -lrte_eal
> > +LDLIBS += -lrte_eal -lrte_ring
> >
> >  EXPORT_MAP := rte_rcu_version.map
> >
> > diff --git a/lib/librte_rcu/meson.build b/lib/librte_rcu/meson.build
> > index c009ae4b7..3eb2ace17 100644
> > --- a/lib/librte_rcu/meson.build
> > +++ b/lib/librte_rcu/meson.build
> > @@ -3,3 +3,10 @@
> >
> >  sources = files('rte_rcu_qsbr.c')
> >  headers = files('rte_rcu_qsbr.h')
> > +
> > +# for clang 32-bit compiles we need libatomic for 64-bit atomic ops
> > +if cc.get_id() == 'clang' and dpdk_conf.get('RTE_ARCH_64') == false
> > +     ext_deps += cc.find_library('atomic')
> > +endif
> > +
>
> As a nit - as Pavan patch is already integrated into mainline,
> this is not necessary any more, I think.

I can handle this.


> Also noticed that most of make builds failed due to dependency problem:
> http://mails.dpdk.org/archives/test-report/2020-April/127765.html
> I can't reproduce it locally, but my guess that we need to move rcu above
> ring in this mk file: mk/rte.app.mk
> Probably something like that:
> diff --git a/mk/rte.app.mk b/mk/rte.app.mk
> index da12b9eec..8e5d023de 100644
> --- a/mk/rte.app.mk
> +++ b/mk/rte.app.mk
> @@ -91,13 +91,13 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_MEMPOOL)        += -lrte_mempool
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_STACK)          += -lrte_stack
>  _LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_OCTEONTX2_MEMPOOL) += -lrte_mempool_octeontx2
> +_LDLIBS-$(CONFIG_RTE_LIBRTE_RCU)            += -lrte_rcu
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_RING)           += -lrte_ring
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_PCI)            += -lrte_pci
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_EAL)            += -lrte_eal
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_CMDLINE)        += -lrte_cmdline
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_REORDER)        += -lrte_reorder
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_SCHED)          += -lrte_sched
> -_LDLIBS-$(CONFIG_RTE_LIBRTE_RCU)            += -lrte_rcu

No, just moving will not express a dependency.


-- 
David Marchand