Introduce ubpf.c/ubpf-stub.c with basic read and init_jit functions.
Add ubpf related .c files to meson.build.
Signed-off-by: Zhang Chen <chen.zh...@intel.com>
---
ebpf/meson.build | 1 +
ebpf/ubpf-stub.c | 24 +++++++++++
ebpf/ubpf.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ubpf.h | 4 ++
4 files changed, 130 insertions(+)
create mode 100644 ebpf/ubpf-stub.c
create mode 100644 ebpf/ubpf.c
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2dd0fd8948..f4457fbd28 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1,2 @@
softmmu_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false:
files('ebpf_rss-stub.c'))
+softmmu_ss.add(when: ubpf, if_true: files('ubpf.c'), if_false:
files('ubpf-stub.c'))
diff --git a/ebpf/ubpf-stub.c b/ebpf/ubpf-stub.c
new file mode 100644
index 0000000000..2e8bf15b91
--- /dev/null
+++ b/ebpf/ubpf-stub.c
@@ -0,0 +1,24 @@
+/*
+ * QEMU Userspace eBPF Stub File
+ *
+ * Copyright(C) 2022 Intel Corporation.
+ *
+ * Author:
+ * Zhang Chen <chen.zh...@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+bool qemu_ubpf_read_code(UbpfState *u_ebpf, char *path)
+{
+ return 0;
+}
+
+bool qemu_ubpf_read_target(UbpfState *u_ebpf, char *path)
+{
+ return 0;
+}
+
+void qemu_ubpf_init_jit(UbpfState *u_ebpf, bool jit) {}
diff --git a/ebpf/ubpf.c b/ebpf/ubpf.c
new file mode 100644
index 0000000000..38a6530903
--- /dev/null
+++ b/ebpf/ubpf.c
@@ -0,0 +1,101 @@
+/*
+ * QEMU Userspace eBPF Support
+ *
+ * Copyright(C) 2022 Intel Corporation.
+ *
+ * Author:
+ * Zhang Chen <chen.zh...@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "ebpf/ubpf.h"
+
+static void *qemu_ubpf_read(const char *path, size_t maxlen, size_t *len)
+{
+ FILE *file;
+ size_t offset = 0, rv;
+ void *data;
+
+ if (!strcmp(path, "-")) {
+ file = fdopen(STDIN_FILENO, "r");
+ } else {
+ file = fopen(path, "r");
+ }
+
+ if (file == NULL) {
+ error_report("Failed to open %s: %s", path, strerror(errno));
+ return NULL;
+ }
+
+ data = g_malloc0(maxlen);
+
+ while ((rv = fread(data + offset, 1, maxlen - offset, file)) > 0) {
+ offset += rv;
+ }
+
+ if (ferror(file)) {
+ error_report("Failed to read %s: %s", path, strerror(errno));
+ goto err;
+ }
+
+ if (!feof(file)) {
+ error_report("Failed to read %s because it is too large"
+ " (max %u bytes)", path, (unsigned)maxlen);
+ goto err;
+ }
+
+ fclose(file);
+ if (len) {
+ *len = offset;
+ }
+ return data;
+
+err:
+ fclose(file);
+ free(data);
+ return false;
+}
+
+/* Read Userspace eBPF binary file to QEMU */
+bool qemu_ubpf_read_code(UbpfState *u_ebpf, char *path)
+{
+ if (!path) {
+ return false;
+ }
+ u_ebpf->code_path = path;
+
+ u_ebpf->code = qemu_ubpf_read(u_ebpf->code_path, MAX_LEN,
+ &u_ebpf->code_len);
+ if (u_ebpf->code) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/* Read Userspace eBPF target */
+bool qemu_ubpf_read_target(UbpfState *u_ebpf, char *path)
+{
+ if (!path) {
+ return false;
+ }
+ u_ebpf->target_path = path;
+
+ u_ebpf->target = qemu_ubpf_read(u_ebpf->target_path, MAX_LEN,
+ &u_ebpf->target_len);
+ if (u_ebpf->target) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+void qemu_ubpf_init_jit(UbpfState *u_ebpf, bool jit)
+{
+ u_ebpf->jit = jit;
+}
diff --git a/ebpf/ubpf.h b/ebpf/ubpf.h
index 2562fff503..808c02565c 100644
--- a/ebpf/ubpf.h
+++ b/ebpf/ubpf.h
@@ -34,4 +34,8 @@ typedef struct UbpfState {
char *func;
} UbpfState;
+bool qemu_ubpf_read_code(UbpfState *u_ebpf, char *path);
+bool qemu_ubpf_read_target(UbpfState *u_ebpf, char *path);
+void qemu_ubpf_init_jit(UbpfState *u_ebpf, bool jit);
+
#endif /* QEMU_UBPF_H */
--
2.25.1
