[PATCH bpf-next v2 1/1] selftests/bpf: Enable Tx hwtstamp in xdp_hw_metadata

[Song Yoong Siang]

Currently, user needs to manually enable transmit hardware timestamp
feature of certain Ethernet drivers, e.g. stmmac and igc drivers, through
following command after running the xdp_hw_metadata app.

sudo hwstamp_ctl -i eth0 -t 1

To simplify the step test of xdp_hw_metadata, set tx_type to HWTSTAMP_TX_ON
to enable hardware timestamping for all outgoing packets, so that user no
longer need to execute hwstamp_ctl command.

Signed-off-by: Song Yoong Siang <yoong.siang.song@xxxxxxxxx>
Acked-by: Stanislav Fomichev <sdf@xxxxxxxxxxx>
---
v1: https://patchwork.kernel.org/project/netdevbpf/patch/20241204115715.3148412-1-yoong.siang.song@xxxxxxxxx/

v1->v2 changelog:
 - Add detail in commit msg on why HWTSTAMP_TX_ON is needed (Stanislav).
 - Separate the patch into two, current one submit to bpf-next,
   another one submit to bpf.
---
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 06266aad2f99..96c65500f4b4 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -551,6 +551,7 @@ static void hwtstamp_enable(const char *ifname)
 {
 	struct hwtstamp_config cfg = {
 		.rx_filter = HWTSTAMP_FILTER_ALL,
+		.tx_type = HWTSTAMP_TX_ON,
 	};
 
 	hwtstamp_ioctl(SIOCGHWTSTAMP, ifname, &saved_hwtstamp_cfg);
-- 
2.34.1