netdev - Re: [PATCH bpf-next v8 17/17] selftests/bpf: Simple program to dump XDP RX metadata

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Date:   Fri, 20 Jan 2023 14:48:35 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next v8 17/17] selftests/bpf: Simple program to dump
 XDP RX metadata

On Fri, Jan 20, 2023 at 2:30 PM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 1/19/23 2:15 PM, Stanislav Fomichev wrote:
> > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > index e09bef2b7502..9c961d2d868e 100644
> > --- a/tools/testing/selftests/bpf/Makefile
> > +++ b/tools/testing/selftests/bpf/Makefile
> > @@ -83,7 +83,7 @@ TEST_PROGS_EXTENDED := with_addr.sh \
> >   TEST_GEN_PROGS_EXTENDED = test_sock_addr test_skb_cgroup_id_user \
> >       flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \
> >       test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko \
> > -     xskxceiver xdp_redirect_multi xdp_synproxy veristat
> > +     xskxceiver xdp_redirect_multi xdp_synproxy veristat xdp_hw_metadata
> >
> >   TEST_CUSTOM_PROGS = $(OUTPUT)/urandom_read $(OUTPUT)/sign-file
> >   TEST_GEN_FILES += liburandom_read.so
> > @@ -383,6 +383,7 @@ test_subskeleton.skel.h-deps := test_subskeleton_lib2.bpf.o test_subskeleton_lib
> >   test_subskeleton_lib.skel.h-deps := test_subskeleton_lib2.bpf.o test_subskeleton_lib.bpf.o
> >   test_usdt.skel.h-deps := test_usdt.bpf.o test_usdt_multispec.bpf.o
> >   xsk_xdp_progs.skel.h-deps := xsk_xdp_progs.bpf.o
> > +xdp_hw_metadata.skel.h-deps := xdp_hw_metadata.bpf.o
> >
> >   LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
> >
> > @@ -580,6 +581,10 @@ $(OUTPUT)/xskxceiver: xskxceiver.c $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.
> >       $(call msg,BINARY,,$@)
> >       $(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
> >
> > +$(OUTPUT)/xdp_hw_metadata: xdp_hw_metadata.c $(OUTPUT)/network_helpers.o $(OUTPUT)/xsk.o $(OUTPUT)/xdp_hw_metadata.skel.h | $(OUTPUT)
> > +     $(call msg,BINARY,,$@)
> > +     $(Q)$(CC) $(CFLAGS) -static $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
>
> My dev machine fails on '-static' :(. A few machines that I got also don't have
> those static libraries, so likely the default environment that I got here.
>
> It seems to be the only binary using '-static' in this Makefile. Can it be
> removed or at least not the default?

Sure, I can leave it out. It's mostly here due to G's environment
where it is easier to work with static binaries.