From: WanBingjiang <wanbingjiang@webray.com.cn>
Date: Thu, 23 Jul 2026 07:10:19 +0000 (+0800)
Subject: test: (mkfds::mapped-bpf-map) new factory
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f6b19d80fa7914e0c716d09658dd7d1293c96a00;p=thirdparty%2Futil-linux.git

test: (mkfds::mapped-bpf-map) new factory

Signed-off-by: WanBingjiang <wanbingjiang@webray.com.cn>
---

diff --git a/configure.ac b/configure.ac
index 4347e9bf7..0ded064ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -591,6 +591,11 @@ AC_CHECK_DECL([BPF_LINK_CREATE],
 	      [#include <linux/bpf.h>])
 AS_IF([test "x$have_bpf_link_create" = xyes],
 	      [AC_DEFINE([HAVE_BPF_LINK_CREATE], [1], [Define if BPF_LINK_CREATE is available])])
+AC_CHECK_DECL([BPF_F_MMAPABLE],
+	      [have_bpf_f_mmapable=yes], [have_bpf_f_mmapable=no],
+	      [#include <linux/bpf.h>])
+AS_IF([test "x$have_bpf_f_mmapable" = xyes],
+      [AC_DEFINE([HAVE_BPF_F_MMAPABLE], [1], [Define if BPF_F_MMAPABLE is available])])
 
 AC_CHECK_DECL([TIOCGLCKTRMIOS],
 	      [have_tiocglcktrmios=yes], [have_tiocglcktrmios=no],
diff --git a/meson.build b/meson.build
index 70cf39552..27b2a4966 100644
--- a/meson.build
+++ b/meson.build
@@ -4065,6 +4065,9 @@ if LINUX and lib_rt.found()
   if cc.has_header_symbol('linux/bpf.h', 'BPF_LINK_CREATE')
     test_mkfds_c_args += ['-DHAVE_BPF_LINK_CREATE']
   endif
+  if cc.has_header_symbol('linux/bpf.h', 'BPF_F_MMAPABLE')
+    test_mkfds_c_args += ['-DHAVE_BPF_F_MMAPABLE']
+  endif
   exe = executable(
     'test_mkfds',
     'tests/helpers/test_mkfds.c',
diff --git a/tests/helpers/test_mkfds.c b/tests/helpers/test_mkfds.c
index a8ee45129..a4daca977 100644
--- a/tests/helpers/test_mkfds.c
+++ b/tests/helpers/test_mkfds.c
@@ -3094,6 +3094,56 @@ static void free_bpf_link(const struct factory * factory _U_, void *data)
 	free(data);
 }
 #endif /* HAVE_BPF_LINK_CREATE */
+#ifdef HAVE_BPF_F_MMAPABLE
+static void *make_mmapped_bpf_map(const struct factory *factory, struct fdesc fdescs[],
+				  int argc, char ** argv)
+{
+	struct arg name = decode_arg("name", factory->params, argc, argv);
+	const char *sname = ARG_STRING(name);
+
+	int bfd;
+	union bpf_attr attr;
+	struct munmap_data *munmap_data;
+
+	memset(&attr, 0, sizeof(attr));
+	attr.map_type = BPF_MAP_TYPE_ARRAY;
+	attr.map_flags = BPF_F_MMAPABLE;
+	attr.value_size = 4;
+	attr.key_size = 4;
+	attr.max_entries = 10;
+
+	strncpy(attr.map_name, sname, sizeof(attr.map_name) - 1);
+
+	free_arg(&name);
+
+	bfd = syscall(SYS_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
+	if (bfd < 0)
+		err_nosys(EXIT_FAILURE, "failed in bpf(BPF_MAP_CREATE)");
+
+	if (bfd != fdescs[0].fd) {
+		if (dup2(bfd, fdescs[0].fd) < 0) {
+			err(EXIT_FAILURE, "failed to dup %d -> %d", bfd, fdescs[0].fd);
+		}
+		close(bfd);
+	}
+
+	munmap_data = xmalloc(sizeof(*munmap_data));
+	munmap_data->len = 4096;
+	munmap_data->ptr = mmap(NULL, munmap_data->len,
+				PROT_READ | PROT_WRITE,
+				MAP_SHARED, fdescs[0].fd, 0);
+	if (munmap_data->ptr == MAP_FAILED)
+		err(EXIT_FAILURE, "failed to mmap bpf-map");
+
+	fdescs[0] = (struct fdesc){
+		.fd    = fdescs[0].fd,
+		.close = close_fdesc_after_munmap,
+		.data  = munmap_data,
+	};
+
+	return NULL;
+}
+#endif	/* HAVE_BPF_F_MMAPABLE */
 
 static void *make_pty(const struct factory *factory _U_, struct fdesc fdescs[],
 		      int argc _U_, char ** argv _U_)
@@ -4423,6 +4473,25 @@ static const struct factory factories[] = {
 		},
 	},
 #endif
+#ifdef HAVE_BPF_F_MMAPABLE
+	{
+		.name = "mapped-bpf-map",
+		.desc = "mmap'ed bpf map",
+		.priv = true,
+		.N    = 1,
+		.EX_N = 0,
+		.make = make_mmapped_bpf_map,
+		.params = (struct parameter []) {
+			{
+				.name = "name",
+				.type = PTYPE_STRING,
+				.desc = "name assigned to the bpf map object",
+				.defv.string = "mkfds_bpf_map",
+			},
+			PARAM_END
+		}
+	},
+#endif	/* HAVE_BPF_F_MMAPABLE */
 	{
 		.name = "pty",
 		.desc = "make a pair of ptmx and pts",