diff mbox series

[bpf,3/4] selftests/bpf: Provide a generic [un]load_module helper

Message ID 20241008-fix-kfunc-btf-caching-for-modules-v1-3-dfefd9aa4318@redhat.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Fix caching of BTF for kfuncs in the verifier | expand

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Commit Message

Toke Høiland-Jørgensen Oct. 8, 2024, 10:35 a.m. UTC 
From: Simon Sundberg <simon.sundberg@kau.se>

Generalize the previous [un]load_bpf_testmod() helpers (in
testing_helpers.c) to the more generic [un]load_module(), which can
load an arbitrary kernel module by name. This allows future selftests
to more easily load custom kernel modules other than bpf_testmod.ko.
Refactor [un]load_bpf_testmod() to wrap this new helper.

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 tools/testing/selftests/bpf/testing_helpers.c | 34 +++++++++++++++++----------
 tools/testing/selftests/bpf/testing_helpers.h |  2 ++
 2 files changed, 24 insertions(+), 12 deletions(-)

Comments

Jiri Olsa Oct. 8, 2024, 5:54 p.m. UTC | #1 
On Tue, Oct 08, 2024 at 12:35:18PM +0200, Toke Høiland-Jørgensen wrote:
> From: Simon Sundberg <simon.sundberg@kau.se>
> 
> Generalize the previous [un]load_bpf_testmod() helpers (in
> testing_helpers.c) to the more generic [un]load_module(), which can
> load an arbitrary kernel module by name. This allows future selftests
> to more easily load custom kernel modules other than bpf_testmod.ko.
> Refactor [un]load_bpf_testmod() to wrap this new helper.
> 
> Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Acked-by: Jiri Olsa <jolsa@kernel.org>

jirka

> ---
>  tools/testing/selftests/bpf/testing_helpers.c | 34 +++++++++++++++++----------
>  tools/testing/selftests/bpf/testing_helpers.h |  2 ++
>  2 files changed, 24 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
> index d3c3c3a24150f99abd13ecb7d7b11d8f7351560d..5e9f16683be5460b1a295fb9754df761cbd090ea 100644
> --- a/tools/testing/selftests/bpf/testing_helpers.c
> +++ b/tools/testing/selftests/bpf/testing_helpers.c
> @@ -367,7 +367,7 @@ int delete_module(const char *name, int flags)
>  	return syscall(__NR_delete_module, name, flags);
>  }
>  
> -int unload_bpf_testmod(bool verbose)
> +int unload_module(const char *name, bool verbose)
>  {
>  	int ret, cnt = 0;
>  
> @@ -375,11 +375,11 @@ int unload_bpf_testmod(bool verbose)
>  		fprintf(stdout, "Failed to trigger kernel-side RCU sync!\n");
>  
>  	for (;;) {
> -		ret = delete_module("bpf_testmod", 0);
> +		ret = delete_module(name, 0);
>  		if (!ret || errno != EAGAIN)
>  			break;
>  		if (++cnt > 10000) {
> -			fprintf(stdout, "Unload of bpf_testmod timed out\n");
> +			fprintf(stdout, "Unload of %s timed out\n", name);
>  			break;
>  		}
>  		usleep(100);
> @@ -388,41 +388,51 @@ int unload_bpf_testmod(bool verbose)
>  	if (ret) {
>  		if (errno == ENOENT) {
>  			if (verbose)
> -				fprintf(stdout, "bpf_testmod.ko is already unloaded.\n");
> +				fprintf(stdout, "%s.ko is already unloaded.\n", name);
>  			return -1;
>  		}
> -		fprintf(stdout, "Failed to unload bpf_testmod.ko from kernel: %d\n", -errno);
> +		fprintf(stdout, "Failed to unload %s.ko from kernel: %d\n", name, -errno);
>  		return -1;
>  	}
>  	if (verbose)
> -		fprintf(stdout, "Successfully unloaded bpf_testmod.ko.\n");
> +		fprintf(stdout, "Successfully unloaded %s.ko.\n", name);
>  	return 0;
>  }
>  
> -int load_bpf_testmod(bool verbose)
> +int load_module(const char *path, bool verbose)
>  {
>  	int fd;
>  
>  	if (verbose)
> -		fprintf(stdout, "Loading bpf_testmod.ko...\n");
> +		fprintf(stdout, "Loading %s...\n", path);
>  
> -	fd = open("bpf_testmod.ko", O_RDONLY);
> +	fd = open(path, O_RDONLY);
>  	if (fd < 0) {
> -		fprintf(stdout, "Can't find bpf_testmod.ko kernel module: %d\n", -errno);
> +		fprintf(stdout, "Can't find %s kernel module: %d\n", path, -errno);
>  		return -ENOENT;
>  	}
>  	if (finit_module(fd, "", 0)) {
> -		fprintf(stdout, "Failed to load bpf_testmod.ko into the kernel: %d\n", -errno);
> +		fprintf(stdout, "Failed to load %s into the kernel: %d\n", path, -errno);
>  		close(fd);
>  		return -EINVAL;
>  	}
>  	close(fd);
>  
>  	if (verbose)
> -		fprintf(stdout, "Successfully loaded bpf_testmod.ko.\n");
> +		fprintf(stdout, "Successfully loaded %s.\n", path);
>  	return 0;
>  }
>  
> +int unload_bpf_testmod(bool verbose)
> +{
> +	return unload_module("bpf_testmod", verbose);
> +}
> +
> +int load_bpf_testmod(bool verbose)
> +{
> +	return load_module("bpf_testmod.ko", verbose);
> +}
> +
>  /*
>   * Trigger synchronize_rcu() in kernel.
>   */
> diff --git a/tools/testing/selftests/bpf/testing_helpers.h b/tools/testing/selftests/bpf/testing_helpers.h
> index d55f6ab124338ccab33bc120ca7e3baa18264aea..46d7f7089f636b0d2476859fd0fa5e1c4b305419 100644
> --- a/tools/testing/selftests/bpf/testing_helpers.h
> +++ b/tools/testing/selftests/bpf/testing_helpers.h
> @@ -38,6 +38,8 @@ int unload_bpf_testmod(bool verbose);
>  int kern_sync_rcu(void);
>  int finit_module(int fd, const char *param_values, int flags);
>  int delete_module(const char *name, int flags);
> +int load_module(const char *path, bool verbose);
> +int unload_module(const char *name, bool verbose);
>  
>  static inline __u64 get_time_ns(void)
>  {
> 
> -- 
> 2.47.0
>
Kumar Kartikeya Dwivedi Oct. 9, 2024, 1:44 a.m. UTC | #2 
On Tue, 8 Oct 2024 at 12:35, Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> From: Simon Sundberg <simon.sundberg@kau.se>
>
> Generalize the previous [un]load_bpf_testmod() helpers (in
> testing_helpers.c) to the more generic [un]load_module(), which can
> load an arbitrary kernel module by name. This allows future selftests
> to more easily load custom kernel modules other than bpf_testmod.ko.
> Refactor [un]load_bpf_testmod() to wrap this new helper.
>
> Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
> ---

Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c
index d3c3c3a24150f99abd13ecb7d7b11d8f7351560d..5e9f16683be5460b1a295fb9754df761cbd090ea 100644
--- a/tools/testing/selftests/bpf/testing_helpers.c
+++ b/tools/testing/selftests/bpf/testing_helpers.c
@@ -367,7 +367,7 @@  int delete_module(const char *name, int flags)
 	return syscall(__NR_delete_module, name, flags);
 }
 
-int unload_bpf_testmod(bool verbose)
+int unload_module(const char *name, bool verbose)
 {
 	int ret, cnt = 0;
 
@@ -375,11 +375,11 @@  int unload_bpf_testmod(bool verbose)
 		fprintf(stdout, "Failed to trigger kernel-side RCU sync!\n");
 
 	for (;;) {
-		ret = delete_module("bpf_testmod", 0);
+		ret = delete_module(name, 0);
 		if (!ret || errno != EAGAIN)
 			break;
 		if (++cnt > 10000) {
-			fprintf(stdout, "Unload of bpf_testmod timed out\n");
+			fprintf(stdout, "Unload of %s timed out\n", name);
 			break;
 		}
 		usleep(100);
@@ -388,41 +388,51 @@  int unload_bpf_testmod(bool verbose)
 	if (ret) {
 		if (errno == ENOENT) {
 			if (verbose)
-				fprintf(stdout, "bpf_testmod.ko is already unloaded.\n");
+				fprintf(stdout, "%s.ko is already unloaded.\n", name);
 			return -1;
 		}
-		fprintf(stdout, "Failed to unload bpf_testmod.ko from kernel: %d\n", -errno);
+		fprintf(stdout, "Failed to unload %s.ko from kernel: %d\n", name, -errno);
 		return -1;
 	}
 	if (verbose)
-		fprintf(stdout, "Successfully unloaded bpf_testmod.ko.\n");
+		fprintf(stdout, "Successfully unloaded %s.ko.\n", name);
 	return 0;
 }
 
-int load_bpf_testmod(bool verbose)
+int load_module(const char *path, bool verbose)
 {
 	int fd;
 
 	if (verbose)
-		fprintf(stdout, "Loading bpf_testmod.ko...\n");
+		fprintf(stdout, "Loading %s...\n", path);
 
-	fd = open("bpf_testmod.ko", O_RDONLY);
+	fd = open(path, O_RDONLY);
 	if (fd < 0) {
-		fprintf(stdout, "Can't find bpf_testmod.ko kernel module: %d\n", -errno);
+		fprintf(stdout, "Can't find %s kernel module: %d\n", path, -errno);
 		return -ENOENT;
 	}
 	if (finit_module(fd, "", 0)) {
-		fprintf(stdout, "Failed to load bpf_testmod.ko into the kernel: %d\n", -errno);
+		fprintf(stdout, "Failed to load %s into the kernel: %d\n", path, -errno);
 		close(fd);
 		return -EINVAL;
 	}
 	close(fd);
 
 	if (verbose)
-		fprintf(stdout, "Successfully loaded bpf_testmod.ko.\n");
+		fprintf(stdout, "Successfully loaded %s.\n", path);
 	return 0;
 }
 
+int unload_bpf_testmod(bool verbose)
+{
+	return unload_module("bpf_testmod", verbose);
+}
+
+int load_bpf_testmod(bool verbose)
+{
+	return load_module("bpf_testmod.ko", verbose);
+}
+
 /*
  * Trigger synchronize_rcu() in kernel.
  */
diff --git a/tools/testing/selftests/bpf/testing_helpers.h b/tools/testing/selftests/bpf/testing_helpers.h
index d55f6ab124338ccab33bc120ca7e3baa18264aea..46d7f7089f636b0d2476859fd0fa5e1c4b305419 100644
--- a/tools/testing/selftests/bpf/testing_helpers.h
+++ b/tools/testing/selftests/bpf/testing_helpers.h
@@ -38,6 +38,8 @@  int unload_bpf_testmod(bool verbose);
 int kern_sync_rcu(void);
 int finit_module(int fd, const char *param_values, int flags);
 int delete_module(const char *name, int flags);
+int load_module(const char *path, bool verbose);
+int unload_module(const char *name, bool verbose);
 
 static inline __u64 get_time_ns(void)
 {