[RFC PATCH v8 38/49] bpf tools: Load instructions buffer using load_program()

[Wang Nan]

Extract code for loading a 'struct bpf_insn' array into kernel to
load_program() and makes bpf_program__load() to call it. Now we have
function loads instructions into kernel. It will be used by further
patches, which creates different instances from a program and load them
into kernel.

Signed-off-by: Wang Nan <wangn...@huawei.com>
---
 tools/lib/bpf/libbpf.c | 51 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 5147a98..a2f2991 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -745,48 +745,59 @@ static int bpf_object__collect_reloc(struct bpf_object 
*obj)
 }
 
 static int
-bpf_program__load(struct bpf_program *prog,
-                 char *license, u32 kern_version)
+load_program(struct bpf_insn *insns, int insns_cnt,
+            char *license, u32 kern_version, int *pfd)
 {
-       int fd, err;
+       int ret;
        char *log_buf;
 
-       if (!prog->insns || !prog->insns_cnt)
+       if (!insns || !insns_cnt)
                return -EINVAL;
 
        log_buf = malloc(BPF_LOG_BUF_SIZE);
        if (!log_buf)
                pr_warning("Alloc log buffer for bpf loader error, continue 
without log\n");
 
-       fd = bpf_load_program(BPF_PROG_TYPE_KPROBE, prog->insns,
-                             prog->insns_cnt, license,
-                             kern_version, log_buf,
-                             BPF_LOG_BUF_SIZE);
+       ret = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
+                              insns_cnt, license, kern_version,
+                              log_buf, BPF_LOG_BUF_SIZE);
 
-       if (fd >= 0) {
-               prog->fd = fd;
-               pr_debug("load bpf program '%s': fd = %d\n",
-                        prog->section_name, prog->fd);
-               err = 0;
+       if (ret >= 0) {
+               *pfd = ret;
+               ret = 0;
                goto out;
        }
 
-       err = -EINVAL;
-       pr_warning("load bpf program '%s' failed: %s\n",
-                  prog->section_name, strerror(errno));
+       ret = -EINVAL;
+       pr_warning("load bpf program failed: %s\n", strerror(errno));
 
        if (log_buf) {
-               pr_warning("bpf: load: failed to load program '%s':\n",
-                          prog->section_name);
                pr_warning("-- BEGIN DUMP LOG ---\n");
-               pr_warning("%s\n", log_buf);
+               pr_warning("\n%s\n", log_buf);
                pr_warning("-- END LOG --\n");
        }
 
 out:
+       free(log_buf);
+       return ret;
+}
+
+static int
+bpf_program__load(struct bpf_program *prog,
+                 char *license, u32 kern_version)
+{
+       int err, fd;
+
+       err = load_program(prog->insns, prog->insns_cnt,
+                          license, kern_version, &fd);
+       if (!err)
+               prog->fd = fd;
+
+       if (err)
+               pr_warning("failed to load program '%s'\n",
+                          prog->section_name);
        zfree(&prog->insns);
        prog->insns_cnt = 0;
-       free(log_buf);
        return err;
 }
 
-- 
1.8.3.4

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