[PATCH RFC bpf-next 34/52] samples/bpf: add 'timeout' option to xdp_redirect_cpu

Alexander Lobakin
2022-06-28T19:53:16Z

Add ability to specify a deferred flush timeout (in usec, not nsec!)
when setting up a cpumap in xdp_redirect_cpu sample.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
---
samples/bpf/xdp_redirect_cpu_user.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
index ca457c34eb0f..d184c3fcab53 100644
--- a/samples/bpf/xdp_redirect_cpu_user.c
+++ b/samples/bpf/xdp_redirect_cpu_user.c
@@ -34,6 +34,8 @@ static const char *__doc__ =
#include "xdp_sample_user.h"
#include "xdp_redirect_cpu.skel.h"

+#define NSEC_PER_USEC 1000UL
+
static int map_fd;
static int avail_fd;
static int count_fd;
@@ -61,6 +63,7 @@ static const struct option long_options[] = {
{ "redirect-device", required_argument, NULL, 'r' },
{ "redirect-map", required_argument, NULL, 'm' },
{ "meta-thresh", optional_argument, NULL, 'M' },
+ { "timeout", required_argument, NULL, 't'},
{}
};

@@ -128,9 +131,10 @@ static int create_cpu_entry(__u32 cpu, struct bpf_cpumap_val *value,
}
}

- printf("%s CPU: %u as idx: %u qsize: %d cpumap_prog_fd: %d (cpus_count: %u)\n",
+ printf("%s CPU: %u as idx: %u qsize: %d timeout: %llu cpumap_prog_fd: %d (cpus_count: %u)\n",
new ? "Add new" : "Replace", cpu, avail_idx,
- value->qsize, value->bpf_prog.fd, curr_cpus_count);
+ value->qsize, value->timeout, value->bpf_prog.fd,
+ curr_cpus_count);

return 0;
}
@@ -346,6 +350,7 @@ int main(int argc, char **argv)
* tuned-adm profile network-latency
*/
qsize = 2048;
+ value.timeout = 0; /* Defaults to 0 to mimic the previous behaviour. */

skel = xdp_redirect_cpu__open();
if (!skel) {
@@ -383,7 +388,7 @@ int main(int argc, char **argv)
}

prog = skel->progs.xdp_prognum5_lb_hash_ip_pairs;
- while ((opt = getopt_long(argc, argv, "d:si:Sxp:f:e:r:m:c:q:FMvh",
+ while ((opt = getopt_long(argc, argv, "d:si:Sxp:f:e:r:m:c:q:FMt:vh",
long_options, &longindex)) != -1) {
switch (opt) {
case 'd':
@@ -466,6 +471,10 @@ int main(int argc, char **argv)
opts.meta_thresh = optarg ? strtoul(optarg, NULL, 0) :
1;
break;
+ case 't':
+ value.timeout = strtoull(optarg, NULL, 0) *
+ NSEC_PER_USEC;
+ break;
case 'h':
error = false;
default:
--
2.36.1