+/*
+ * Check that user provided external symbol.
+ */
+static int
+bpf_check_xsym(const struct rte_bpf_xsym *xsym)
+{
+ uint32_t i;
+
+ if (xsym->name == NULL)
+ return -EINVAL;
+
+ if (xsym->type == RTE_BPF_XTYPE_VAR) {
+ if (xsym->var.desc.type == RTE_BPF_ARG_UNDEF)
+ return -EINVAL;
+ } else if (xsym->type == RTE_BPF_XTYPE_FUNC) {
+
+ if (xsym->func.nb_args > EBPF_FUNC_MAX_ARGS)
+ return -EINVAL;
+
+ /* check function arguments */
+ for (i = 0; i != xsym->func.nb_args; i++) {
+ if (xsym->func.args[i].type == RTE_BPF_ARG_UNDEF)
+ return -EINVAL;
+ }
+
+ /* check return value info */
+ if (xsym->func.ret.type != RTE_BPF_ARG_UNDEF &&
+ xsym->func.ret.size == 0)
+ return -EINVAL;
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+