2023-04-06 00:02:36

by Kal Cutter Conley

Subject: [PATCH bpf-next v2 2/2] selftests: xsk: Add test UNALIGNED_INV_DESC_4K1_FRAME_SIZE

Add unaligned descriptor test for frame size of 4001. Using an odd frame
size ensures that the end of the UMEM is not near a page boundary. This
allows testing descriptors that staddle the end of the UMEM but not a
page.

This test used to fail without the previous commit ("xsk: Add check for
unaligned descriptors that overrun UMEM").

Signed-off-by: Kal Conley <[email protected]>
---
tools/testing/selftests/bpf/xskxceiver.c | 24 ++++++++++++++++++++++++
tools/testing/selftests/bpf/xskxceiver.h | 1 +
2 files changed, 25 insertions(+)

diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 1a4bdd5aa78c..5a9691e942de 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -69,6 +69,7 @@
*/

#define _GNU_SOURCE
+#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#include <getopt.h>
@@ -1876,6 +1877,29 @@ static void run_pkt_test(struct test_spec *test, enum test_mode mode, enum test_
test->ifobj_rx->umem->unaligned_mode = true;
testapp_invalid_desc(test);
break;
+ case TEST_TYPE_UNALIGNED_INV_DESC_4K1_FRAME: {
+ u64 page_size, umem_size;
+
+ if (!hugepages_present(test->ifobj_tx)) {
+ ksft_test_result_skip("No 2M huge pages present.\n");
+ return;
+ }
+ test_spec_set_name(test, "UNALIGNED_INV_DESC_4K1_FRAME_SIZE");
+ /* Odd frame size so the UMEM doesn't end near a page boundary. */
+ test->ifobj_tx->umem->frame_size = 4001;
+ test->ifobj_rx->umem->frame_size = 4001;
+ test->ifobj_tx->umem->unaligned_mode = true;
+ test->ifobj_rx->umem->unaligned_mode = true;
+ /* This test exists to test descriptors that staddle the end of
+ * the UMEM but not a page.
+ */
+ page_size = sysconf(_SC_PAGESIZE);
+ umem_size = test->ifobj_tx->umem->num_frames * test->ifobj_tx->umem->frame_size;
+ assert(umem_size % page_size > PKT_SIZE);
+ assert(umem_size % page_size < page_size - PKT_SIZE);
+ testapp_invalid_desc(test);
+ break;
+ }
case TEST_TYPE_UNALIGNED:
if (!testapp_unaligned(test))
return;
diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
index cc24ab72f3ff..919327807a4e 100644
--- a/tools/testing/selftests/bpf/xskxceiver.h
+++ b/tools/testing/selftests/bpf/xskxceiver.h
@@ -78,6 +78,7 @@ enum test_type {
TEST_TYPE_ALIGNED_INV_DESC,
TEST_TYPE_ALIGNED_INV_DESC_2K_FRAME,
TEST_TYPE_UNALIGNED_INV_DESC,
+ TEST_TYPE_UNALIGNED_INV_DESC_4K1_FRAME,
TEST_TYPE_HEADROOM,
TEST_TYPE_TEARDOWN,
TEST_TYPE_BIDI,
--
2.39.2

2023-04-06 00:17:56

by Kal Cutter Conley

Subject: Re: [PATCH bpf-next v2 2/2] selftests: xsk: Add test UNALIGNED_INV_DESC_4K1_FRAME_SIZE

> Add unaligned descriptor test for frame size of 4001. Using an odd frame
> size ensures that the end of the UMEM is not near a page boundary. This
> allows testing descriptors that staddle the end of the UMEM but not a
> page.
>
> This test used to fail without the previous commit ("xsk: Add check for
> unaligned descriptors that overrun UMEM").

Sorry I forgot to update the commit message with the new commit label.
If accepted, please change the second paragraph to :

This test used to fail without the previous commit ("xsk: Fix unaligned
descriptor validation").