loader/interface: attach bpf program directly using netlink

[project/qosify.git] / loader.c

diff --git a/loader.c b/loader.c
index c50e739056199b56e983c89b64df621b3a83eecd..64797f0092c27abfe3714457b8be54ff2587eb45 100644 (file)
--- a/loader.c
+++ b/loader.c
@@ -10,6 +10,17 @@
 
 #include "qosify.h"
 
+static struct {
+       const char *suffix;
+       uint32_t flags;
+       int fd;
+} bpf_progs[] = {
+       { "egress_eth",  0 },
+       { "egress_ip",   QOSIFY_IP_ONLY },
+       { "ingress_eth", QOSIFY_INGRESS },
+       { "ingress_ip",  QOSIFY_INGRESS | QOSIFY_IP_ONLY },
+};
+
 static int qosify_bpf_pr(enum libbpf_print_level level, const char *format,
                     va_list args)
 {
@@ -38,8 +49,24 @@ static void qosify_fill_rodata(struct bpf_object *obj, uint32_t flags)
        }
 }
 
+const char *qosify_get_program(uint32_t flags, int *fd)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
+               if (bpf_progs[i].flags != flags)
+                       continue;
+
+               *fd = bpf_progs[i].fd;
+               return bpf_progs[i].suffix;
+       }
+
+       return NULL;
+}
+
+
 static int
-qosify_create_program(const char *suffix, uint32_t flags)
+qosify_create_program(int idx)
 {
        DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
                .pin_root_path = CLASSIFY_DATA_PATH,
@@ -49,7 +76,7 @@ qosify_create_program(const char *suffix, uint32_t flags)
        char path[256];
        int err;
 
-       snprintf(path, sizeof(path), CLASSIFY_PIN_PATH "_" "%s", suffix);
+       snprintf(path, sizeof(path), CLASSIFY_PIN_PATH "_" "%s", bpf_progs[idx].suffix);
 
        obj = bpf_object__open_file(CLASSIFY_PROG_PATH, &opts);
        err = libbpf_get_error(obj);
@@ -66,7 +93,7 @@ qosify_create_program(const char *suffix, uint32_t flags)
 
        bpf_program__set_type(prog, BPF_PROG_TYPE_SCHED_CLS);
 
-       qosify_fill_rodata(obj, flags);
+       qosify_fill_rodata(obj, bpf_progs[idx].flags);
 
        err = bpf_object__load(obj);
        if (err) {
@@ -81,24 +108,23 @@ qosify_create_program(const char *suffix, uint32_t flags)
        if (err) {
                fprintf(stderr, "Failed to pin program to %s: %s\n",
                        path, strerror(-err));
+               return -1;
        }
 
        bpf_object__close(obj);
 
+       err = bpf_obj_get(path);
+       if (err < 0) {
+               fprintf(stderr, "Failed to load pinned program %s: %s\n",
+                       path, strerror(errno));
+       }
+       bpf_progs[idx].fd = err;
+
        return 0;
 }
 
 int qosify_loader_init(void)
 {
-       static const struct {
-               const char *suffix;
-               uint32_t flags;
-       } progs[] = {
-               { "egress_eth", 0 },
-               { "egress_ip", QOSIFY_IP_ONLY },
-               { "ingress_eth", QOSIFY_INGRESS },
-               { "ingress_ip", QOSIFY_INGRESS | QOSIFY_IP_ONLY },
-       };
        glob_t g;
        int i;
 
@@ -107,13 +133,12 @@ int qosify_loader_init(void)
                        unlink(g.gl_pathv[i]);
        }
 
-
        libbpf_set_print(qosify_bpf_pr);
 
        qosify_init_env();
 
-       for (i = 0; i < ARRAY_SIZE(progs); i++) {
-               if (qosify_create_program(progs[i].suffix, progs[i].flags))
+       for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
+               if (qosify_create_program(i))
                        return -1;
        }