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bpf, samples: fix build warning in cookie_uid_helper_example 

Fix the following warnings triggered by 51570a5ab2 ("A Sample of
using socket cookie and uid for traffic monitoring"):

  In file included from /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:54:0:
  /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c: In function 'prog_load':
  /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:119:27: warning: overflow in implicit constant conversion [-Woverflow]
     -32 + offsetof(struct stats, uid)),
                           ^
  /home/foo/net-next/samples/bpf/libbpf.h:135:12: note: in definition of macro 'BPF_STX_MEM'
   .off   = OFF,     \
            ^
  /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:121:27: warning: overflow in implicit constant conversion [-Woverflow]
     -32 + offsetof(struct stats, packets), 1),
                           ^
  /home/foo/net-next/samples/bpf/libbpf.h:155:12: note: in definition of macro 'BPF_ST_MEM'
   .off   = OFF,     \
            ^
  /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:129:27: warning: overflow in implicit constant conversion [-Woverflow]
     -32 + offsetof(struct stats, bytes)),
                           ^
  /home/foo/net-next/samples/bpf/libbpf.h:135:12: note: in definition of macro 'BPF_STX_MEM'
   .off   = OFF,     \
            ^
  HOSTLD  /home/foo/net-next/samples/bpf/per_socket_stats_example

Fixes: 51570a5ab2 ("A Sample of using socket cookie and uid for traffic monitoring")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-05-02 00:47:09 +02:00 committed by David S. Miller
parent e3bf4c61da
commit eb6211d360
1 changed files with 3 additions and 3 deletions
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6
samples/bpf/cookie_uid_helper_example.c
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@ -116,9 +116,9 @@ static void prog_load(void)
* is set by directly place a IMM value 1 into the stack.
*/
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0,
-32 + offsetof(struct stats, uid)),
-32 + (__s16)offsetof(struct stats, uid)),
BPF_ST_MEM(BPF_DW, BPF_REG_10,
-32 + offsetof(struct stats, packets), 1),
-32 + (__s16)offsetof(struct stats, packets), 1),
/*
* __sk_buff is a special struct used for eBPF program to
* directly access some sk_buff field.
@ -126,7 +126,7 @@ static void prog_load(void)
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
offsetof(struct __sk_buff, len)),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1,
-32 + offsetof(struct stats, bytes)),
-32 + (__s16)offsetof(struct stats, bytes)),
/*
* add new map entry using BPF_FUNC_map_update_elem, it takes
* 4 parameters (R1: map_fd, R2: &socket_cookie, R3: &stats,