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samples: bpf: Fix uninitialized variable in xdp_redirect_cpu

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While at it, also improve help output when CPU number is greater than
possible.

Fixes: e531a220cc ("samples: bpf: Convert xdp_redirect_cpu to XDP samples helper")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210826120910.454081-1-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-08-26 17:39:10 +05:30 committed by Alexei Starovoitov
parent 3599bc5101
commit 48b2e71c2e
1 changed files with 3 additions and 2 deletions
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5
samples/bpf/xdp_redirect_cpu_user.c
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@ -141,7 +141,7 @@ static int create_cpu_entry(__u32 cpu, struct bpf_cpumap_val *value,
static int mark_cpus_unavailable(void) static int mark_cpus_unavailable(void)
{ {
int ret, i, n_cpus = libbpf_num_possible_cpus(); int ret, i, n_cpus = libbpf_num_possible_cpus();
__u32 invalid_cpu; __u32 invalid_cpu = n_cpus;
for (i = 0; i < n_cpus; i++) { for (i = 0; i < n_cpus; i++) {
ret = bpf_map_update_elem(avail_fd, &i, ret = bpf_map_update_elem(avail_fd, &i,
@ -449,8 +449,9 @@ int main(int argc, char **argv)
add_cpu = strtoul(optarg, NULL, 0); add_cpu = strtoul(optarg, NULL, 0);
if (add_cpu >= n_cpus) { if (add_cpu >= n_cpus) {
fprintf(stderr, fprintf(stderr,
"--cpu nr too large for cpumap err(%d):%s\n", "--cpu nr too large for cpumap err (%d):%s\n",
errno, strerror(errno)); errno, strerror(errno));
usage(argv, long_options, __doc__, mask, true, skel->obj);
goto end_cpu; goto end_cpu;
} }
cpu[added_cpus++] = add_cpu; cpu[added_cpus++] = add_cpu;