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: Jean-Tsung Hsiao <jhsiao@redhat.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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2 changed files with 3 additions and 3 deletions
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@ -14,7 +14,7 @@
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#include <uapi/linux/bpf.h>
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#include "bpf_helpers.h"
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#define MAX_CPUS 12 /* WARNING - sync with _user.c */
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#define MAX_CPUS 64 /* WARNING - sync with _user.c */
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/* Special map type that can XDP_REDIRECT frames to another CPU */
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struct bpf_map_def SEC("maps") cpu_map = {
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@ -19,7 +19,7 @@ static const char *__doc__ =
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#include <arpa/inet.h>
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#include <linux/if_link.h>
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#define MAX_CPUS 12 /* WARNING - sync with _kern.c */
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#define MAX_CPUS 64 /* WARNING - sync with _kern.c */
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/* How many xdp_progs are defined in _kern.c */
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#define MAX_PROG 5
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@ -527,7 +527,7 @@ static void stress_cpumap(void)
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* procedure.
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*/
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create_cpu_entry(1, 1024, 0, false);
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create_cpu_entry(1, 128, 0, false);
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create_cpu_entry(1, 8, 0, false);
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create_cpu_entry(1, 16000, 0, false);
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}
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