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[bpf-next,v4,11/15] libbpf: struct_ops in SEC("?.struct_ops") / SEC("?.struct_ops.link")

Message ID 20240306104529.6453-12-eddyz87@gmail.com (mailing list archive)
State Accepted
Commit cea716b7850be1442336c5cabdfd112177e0bfbd
Delegated to: BPF
Headers show
Series libbpf: type suffixes and autocreate flag for struct_ops maps | expand

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Commit Message

Eduard Zingerman March 6, 2024, 10:45 a.m. UTC 
Allow using two new section names for struct_ops maps:
- SEC("?.struct_ops")
- SEC("?.struct_ops.link")

To specify maps that have bpf_map->autocreate == false after open.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 tools/lib/bpf/libbpf.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index cff72de42bf4..ec0f508b853d 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1322,6 +1322,15 @@  static int init_struct_ops_maps(struct bpf_object *obj, const char *sec_name,
 			return -ENOMEM;
 		map->btf_value_type_id = type_id;
 
+		/* Follow same convention as for programs autoload:
+		 * SEC("?.struct_ops") means map is not created by default.
+		 */
+		if (sec_name[0] == '?') {
+			map->autocreate = false;
+			/* from now on forget there was ? in section name */
+			sec_name++;
+		}
+
 		map->def.type = BPF_MAP_TYPE_STRUCT_OPS;
 		map->def.key_size = sizeof(int);
 		map->def.value_size = type->size;
@@ -3685,7 +3694,9 @@  static int bpf_object__elf_collect(struct bpf_object *obj)
 				sec_desc->shdr = sh;
 				sec_desc->data = data;
 			} else if (strcmp(name, STRUCT_OPS_SEC) == 0 ||
-				   strcmp(name, STRUCT_OPS_LINK_SEC) == 0) {
+				   strcmp(name, STRUCT_OPS_LINK_SEC) == 0 ||
+				   strcmp(name, "?" STRUCT_OPS_SEC) == 0 ||
+				   strcmp(name, "?" STRUCT_OPS_LINK_SEC) == 0) {
 				sec_desc->sec_type = SEC_ST_OPS;
 				sec_desc->shdr = sh;
 				sec_desc->data = data;
@@ -3705,6 +3716,8 @@  static int bpf_object__elf_collect(struct bpf_object *obj)
 			if (!section_have_execinstr(obj, targ_sec_idx) &&
 			    strcmp(name, ".rel" STRUCT_OPS_SEC) &&
 			    strcmp(name, ".rel" STRUCT_OPS_LINK_SEC) &&
+			    strcmp(name, ".rel?" STRUCT_OPS_SEC) &&
+			    strcmp(name, ".rel?" STRUCT_OPS_LINK_SEC) &&
 			    strcmp(name, ".rel" MAPS_ELF_SEC)) {
 				pr_info("elf: skipping relo section(%d) %s for section(%d) %s\n",
 					idx, name, targ_sec_idx,