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samples/bpf: xdp_redirect_cpu adjustment to reproduce teardown race easier

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The teardown race in cpumap is really hard to reproduce.  These changes
makes it easier to reproduce, for QA.

The --stress-mode now have a case of a very small queue size of 8, that helps
to trigger teardown flush to encounter a full queue, which results in calling
xdp_return_frame API, in a non-NAPI protect context.

Also increase MAX_CPUS, as my QA department have larger machines than me.

Tested-by: Jean-Tsung Hsiao <jhsiao@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jesper Dangaard Brouer 2018-08-08 23:00:39 +02:00 committed by Daniel Borkmann
parent ad0ab027fc
commit 37d7ff2595
2 changed files with 3 additions and 3 deletions
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2
samples/bpf/xdp_redirect_cpu_kern.c
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@ -14,7 +14,7 @@
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"
#define MAX_CPUS 12 /* WARNING - sync with _user.c */
#define MAX_CPUS 64 /* WARNING - sync with _user.c */
/* Special map type that can XDP_REDIRECT frames to another CPU */
struct bpf_map_def SEC("maps") cpu_map = {

4
samples/bpf/xdp_redirect_cpu_user.c
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@ -19,7 +19,7 @@ static const char *__doc__ =
#include <arpa/inet.h>
#include <linux/if_link.h>
#define MAX_CPUS 12 /* WARNING - sync with _kern.c */
#define MAX_CPUS 64 /* WARNING - sync with _kern.c */
/* How many xdp_progs are defined in _kern.c */
#define MAX_PROG 5
@ -527,7 +527,7 @@ static void stress_cpumap(void)
* procedure.
*/
create_cpu_entry(1, 1024, 0, false);
create_cpu_entry(1, 128, 0, false);
create_cpu_entry(1, 8, 0, false);
create_cpu_entry(1, 16000, 0, false);
}