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Date:   Sat, 25 Nov 2023 22:34:28 -0600
From:   Daniel Xu <dxu@...uu.xyz>
To:     Yonghong Song <yonghong.song@...ux.dev>
Cc:     shuah@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        ast@...nel.org, steffen.klassert@...unet.com,
        antony.antony@...unet.com, alexei.starovoitov@...il.com,
        mykolal@...com, martin.lau@...ux.dev, song@...nel.org,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...ux-ipsec.org, netdev@...r.kernel.org
Subject: Re: [PATCH ipsec-next v1 5/7] bpf: selftests: test_tunnel: Use
 vmlinux.h declarations

Hi Yonghong,

On Sat, Nov 25, 2023 at 04:34:36PM -0800, Yonghong Song wrote:
> 
> On 11/22/23 1:20 PM, Daniel Xu wrote:
> > vmlinux.h declarations are more ergnomic, especially when working with
> > kfuncs. The uapi headers are often incomplete for kfunc definitions.
> > 
> > Co-developed-by: Antony Antony <antony.antony@...unet.com>
> > Signed-off-by: Antony Antony <antony.antony@...unet.com>
> > Signed-off-by: Daniel Xu <dxu@...uu.xyz>
> > ---
> >   .../selftests/bpf/progs/bpf_tracing_net.h     |  1 +
> >   .../selftests/bpf/progs/test_tunnel_kern.c    | 48 ++++---------------
> >   2 files changed, 9 insertions(+), 40 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/progs/bpf_tracing_net.h b/tools/testing/selftests/bpf/progs/bpf_tracing_net.h
> > index 0b793a102791..1bdc680b0e0e 100644
> > --- a/tools/testing/selftests/bpf/progs/bpf_tracing_net.h
> > +++ b/tools/testing/selftests/bpf/progs/bpf_tracing_net.h
> > @@ -26,6 +26,7 @@
> >   #define IPV6_AUTOFLOWLABEL	70
> >   #define TC_ACT_UNSPEC		(-1)
> > +#define TC_ACT_OK		0
> >   #define TC_ACT_SHOT		2
> >   #define SOL_TCP			6
> > diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > index f66af753bbbb..3065a716544d 100644
> > --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > @@ -6,62 +6,30 @@
> >    * modify it under the terms of version 2 of the GNU General Public
> >    * License as published by the Free Software Foundation.
> >    */
> > -#include <stddef.h>
> > -#include <string.h>
> > -#include <arpa/inet.h>
> > -#include <linux/bpf.h>
> > -#include <linux/if_ether.h>
> > -#include <linux/if_packet.h>
> > -#include <linux/if_tunnel.h>
> > -#include <linux/ip.h>
> > -#include <linux/ipv6.h>
> > -#include <linux/icmp.h>
> > -#include <linux/types.h>
> > -#include <linux/socket.h>
> > -#include <linux/pkt_cls.h>
> > -#include <linux/erspan.h>
> > -#include <linux/udp.h>
> > +#include "vmlinux.h"
> >   #include <bpf/bpf_helpers.h>
> >   #include <bpf/bpf_endian.h>
> > +#include "bpf_kfuncs.h"
> > +#include "bpf_tracing_net.h"
> >   #define log_err(__ret) bpf_printk("ERROR line:%d ret:%d\n", __LINE__, __ret)
> > -#define VXLAN_UDP_PORT 4789
> > +#define VXLAN_UDP_PORT		4789
> > +#define ETH_P_IP		0x0800
> > +#define PACKET_HOST		0
> > +#define TUNNEL_CSUM		bpf_htons(0x01)
> > +#define TUNNEL_KEY		bpf_htons(0x04)
> >   /* Only IPv4 address assigned to veth1.
> >    * 172.16.1.200
> >    */
> >   #define ASSIGNED_ADDR_VETH1 0xac1001c8
> > -struct geneve_opt {
> > -	__be16	opt_class;
> > -	__u8	type;
> > -	__u8	length:5;
> > -	__u8	r3:1;
> > -	__u8	r2:1;
> > -	__u8	r1:1;
> > -	__u8	opt_data[8]; /* hard-coded to 8 byte */
> > -};
> > -
> >   struct vxlanhdr {
> >   	__be32 vx_flags;
> >   	__be32 vx_vni;
> >   } __attribute__((packed));
> 
> In my particular setup, I have struct vxlanhdr defined in vmlinux.h so
> I hit a compilation failure.

Yeah, saw the same error in CI (the emails are nice btw). Looks like
vxlanhdr isn't even being used in this selftest. I've deleted it for v2.

Thanks,
Daniel

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