BPF: Add sample code for new ib_umad tracepoint

[linux-2.6-microblaze.git] / samples / bpf / ibumad_user.c

diff --git a/samples/bpf/ibumad_user.c b/samples/bpf/ibumad_user.c
new file mode 100644 (file)
index 0000000..097d761
--- /dev/null
+++ b/samples/bpf/ibumad_user.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+
+/**
+ * ibumad BPF sample user side
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Copyright(c) 2018 Ira Weiny, Intel Corporation
+ */
+
+#include <linux/bpf.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <limits.h>
+
+#include <sys/resource.h>
+#include <getopt.h>
+#include <net/if.h>
+
+#include "bpf_load.h"
+#include "bpf_util.h"
+#include "bpf/libbpf.h"
+
+static void dump_counts(int fd)
+{
+       __u32 key;
+       __u64 value;
+
+       for (key = 0; key < 256; key++) {
+               if (bpf_map_lookup_elem(fd, &key, &value)) {
+                       printf("failed to read key %u\n", key);
+                       continue;
+               }
+               if (value)
+                       printf("0x%02x : %llu\n", key, value);
+       }
+}
+
+static void dump_all_counts(void)
+{
+       printf("Read 'Class : count'\n");
+       dump_counts(map_fd[0]);
+       printf("Write 'Class : count'\n");
+       dump_counts(map_fd[1]);
+}
+
+static void dump_exit(int sig)
+{
+       dump_all_counts();
+       exit(0);
+}
+
+static const struct option long_options[] = {
+       {"help",      no_argument,       NULL, 'h'},
+       {"delay",     required_argument, NULL, 'd'},
+};
+
+static void usage(char *cmd)
+{
+       printf("eBPF test program to count packets from various IP addresses\n"
+               "Usage: %s <options>\n"
+               "       --help,   -h  this menu\n"
+               "       --delay,  -d  <delay>  wait <delay> sec between prints [1 - 1000000]\n"
+               , cmd
+               );
+}
+
+int main(int argc, char **argv)
+{
+       unsigned long delay = 5;
+       int longindex = 0;
+       int opt;
+       char bpf_file[256];
+
+       /* Create the eBPF kernel code path name.
+        * This follows the pattern of all of the other bpf samples
+        */
+       snprintf(bpf_file, sizeof(bpf_file), "%s_kern.o", argv[0]);
+
+       /* Do one final dump when exiting */
+       signal(SIGINT, dump_exit);
+       signal(SIGTERM, dump_exit);
+
+       while ((opt = getopt_long(argc, argv, "hd:rSw",
+                                 long_options, &longindex)) != -1) {
+               switch (opt) {
+               case 'd':
+                       delay = strtoul(optarg, NULL, 0);
+                       if (delay == ULONG_MAX || delay < 0 ||
+                           delay > 1000000) {
+                               fprintf(stderr, "ERROR: invalid delay : %s\n",
+                                       optarg);
+                               usage(argv[0]);
+                               return 1;
+                       }
+                       break;
+               default:
+               case 'h':
+                       usage(argv[0]);
+                       return 1;
+               }
+       }
+
+       if (load_bpf_file(bpf_file)) {
+               fprintf(stderr, "ERROR: failed to load eBPF from file : %s\n",
+                       bpf_file);
+               return 1;
+       }
+
+       while (1) {
+               sleep(delay);
+               dump_all_counts();
+       }
+
+       return 0;
+}