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Commit 37d7ff25 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by Daniel Borkmann
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samples/bpf: xdp_redirect_cpu adjustment to reproduce teardown race easier 



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: default avatarJean-Tsung Hsiao <jhsiao@redhat.com>
Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent ad0ab027

samples/bpf/xdp_redirect_cpu_kern.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -14,7 +14,7 @@ 
#include <uapi/linux/bpf.h>

#include <uapi/linux/bpf.h>

#include "bpf_helpers.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 */

/* Special map type that can XDP_REDIRECT frames to another CPU */

struct bpf_map_def SEC("maps") cpu_map = {

struct bpf_map_def SEC("maps") cpu_map = {

samples/bpf/xdp_redirect_cpu_user.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -19,7 +19,7 @@ static const char *__doc__ = 
#include <arpa/inet.h>

#include <arpa/inet.h>

#include <linux/if_link.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 */

/* How many xdp_progs are defined in _kern.c */

#define MAX_PROG 5

#define MAX_PROG 5
@@ -527,7 +527,7 @@ static void stress_cpumap(void) 
	 * procedure.

	 * procedure.

	 */

	 */

	create_cpu_entry(1,  1024, 0, false);

	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);

	create_cpu_entry(1, 16000, 0, false);

}

}