netdev - Re: [PATCH bpf-next v2 0/2] sample: xdp1 improvements

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Date:   Sun, 2 Dec 2018 02:23:41 +0000
From:   Matteo Croce <mcroce@...hat.com>
To:     alexei.starovoitov@...il.com
Cc:     netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Y Song <ys114321@...il.com>
Subject: Re: [PATCH bpf-next v2 0/2] sample: xdp1 improvements

On Sat, Dec 1, 2018 at 6:11 AM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Sat, Dec 01, 2018 at 01:23:04AM +0100, Matteo Croce wrote:
> > Small improvements to improve the readability and easiness
> > to use of the xdp1 sample.
>
> Applied to bpf-next.
>
> I think that sample code could be more useful if it's wrapped with bash
> script like selftests/test_xdp* tests do.
> At that point it can move to selftests to get 0bot coverage.
> Would you be interested in doing that?
>

It would be nice, but I think that the samples have more urgent issues
right now.
Many examples doesn't compile on my system (Fedora 29, GCC 8.2.1, Clang 7.0.0),
these are the errors that I encounter:

  HOSTCC  /home/matteo/src/kernel/linux/samples/bpf/test_lru_dist
/home/matteo/src/kernel/linux/samples/bpf/test_lru_dist.c:39:8: error:
redefinition of ‘struct list_head’
 struct list_head {
        ^~~~~~~~~

  HOSTCC  /home/matteo/src/kernel/linux/samples/bpf/sock_example
In file included from
/home/matteo/src/kernel/linux/samples/bpf/sock_example.c:27:
/usr/include/linux/ip.h:102:2: error: unknown type name ‘__sum16’
  __sum16 check;
  ^~~~~~~

  HOSTCC  /home/matteo/src/kernel/linux/samples/bpf/tracex5_user.o
/home/matteo/src/kernel/linux/samples/bpf/tracex5_user.c: In function
‘install_accept_all_seccomp’:
/home/matteo/src/kernel/linux/samples/bpf/tracex5_user.c:17:21: error:
array type has incomplete element type ‘struct sock_filter’
  struct sock_filter filter[] = {
                     ^~~~~~

  HOSTCC  /home/matteo/src/kernel/linux/samples/bpf/test_cgrp2_attach2.o
/home/matteo/src/kernel/linux/samples/bpf/test_cgrp2_attach2.c: In
function ‘prog_load_cnt’:
/home/matteo/src/kernel/linux/samples/bpf/test_cgrp2_attach2.c:229:3:
error: ‘BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE’ undeclared (first use in
this function); did you mean ‘BPF_MAP_TYPE_CGROUP_STORAGE’?
   BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  HOSTCC  /home/matteo/src/kernel/linux/samples/bpf/xdpsock_user.o
/home/matteo/src/kernel/linux/samples/bpf/xdpsock_user.c:59:15: error:
conflicting types for ‘u64’
 typedef __u64 u64;
               ^~~

To be able to compile the samples, I temporarily removed them from the
compilation this way:

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index be0a961450bc..33d7161f2231 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -4,8 +4,6 @@ BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))
 TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools

 # List of programs to build
-hostprogs-y := test_lru_dist
-hostprogs-y += sock_example
 hostprogs-y += fds_example
 hostprogs-y += sockex1
 hostprogs-y += sockex2
@@ -14,7 +12,6 @@ hostprogs-y += tracex1
 hostprogs-y += tracex2
 hostprogs-y += tracex3
 hostprogs-y += tracex4
-hostprogs-y += tracex5
 hostprogs-y += tracex6
 hostprogs-y += tracex7
 hostprogs-y += test_probe_write_user
@@ -26,7 +23,6 @@ hostprogs-y += map_perf_test
 hostprogs-y += test_overhead
 hostprogs-y += test_cgrp2_array_pin
 hostprogs-y += test_cgrp2_attach
-hostprogs-y += test_cgrp2_attach2
 hostprogs-y += test_cgrp2_sock
 hostprogs-y += test_cgrp2_sock2
 hostprogs-y += xdp1
@@ -49,7 +45,6 @@ hostprogs-y += xdp_rxq_info
 hostprogs-y += syscall_tp
 hostprogs-y += cpustat
 hostprogs-y += xdp_adjust_tail
-hostprogs-y += xdpsock
 hostprogs-y += xdp_fwd
 hostprogs-y += task_fd_query
 hostprogs-y += xdp_sample_pkts

Regards,
-- 
Matteo Croce
per aspera ad upstream