[PATCH bpf] selftests/bpf: add XDP_UMEM_TX_METADATA_LEN flag to umem_config

[Wei Fang]

The Tx metadata test has been broken since the commit d5e726d9143c ("xsk:
Require XDP_UMEM_TX_METADATA_LEN to actuate tx_metadata_len"). Because
this change requires XDP_UMEM_TX_METADATA_LEN flag to be set, otherwise
xsk_buff_pool::tx_metadata_len will be initialized to 0, which means that
the driver cannot get Tx metadata and cannot execute AF_XDP Tx metadata
hooks.

Fixes: d5e726d9143c ("xsk: Require XDP_UMEM_TX_METADATA_LEN to actuate 
tx_metadata_len")
Signed-off-by: Wei Fang <wei.f...@nxp.com>
---
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c 
b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 6f9956eed797..ad6c08dfd6c8 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -79,7 +79,7 @@ static int open_xsk(int ifindex, struct xsk *xsk, __u32 
queue_id)
                .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
                .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
                .frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
-               .flags = XSK_UMEM__DEFAULT_FLAGS,
+               .flags = XDP_UMEM_TX_METADATA_LEN,
                .tx_metadata_len = sizeof(struct xsk_tx_metadata),
        };
        __u32 idx = 0;
-- 
2.34.1