On 28/01/2025 14:26, Zdenek Bouska wrote:
Fixes HW RX timestamp in the following scenario:
- AF_PACKET socket with enabled HW RX timestamps is created
- AF_XDP socket with enabled zero copy is created
- frame is forwarded to the BPF program, where the timestamp should
still be readable (extracted by igc_xdp_rx_timestamp(), kfunc
behind bpf_xdp_metadata_rx_timestamp())
- the frame got XDP_PASS from BPF program, redirecting to the stack
- AF_PACKET socket receives the frame with HW RX timestamp
Moves the skb timestamp setting from igc_dispatch_skb_zc() to
igc_construct_skb_zc() so that igc_construct_skb_zc() is similar to
igc_construct_skb().
This issue can also be reproduced by running:
# tools/testing/selftests/bpf/xdp_hw_metadata enp1s0
When a frame with the wrong port 9092 (instead of 9091) is used:
# echo -n xdp | nc -u -q1 192.168.10.9 9092
then the RX timestamp is missing and xdp_hw_metadata prints:
skb hwtstamp is not found!
With this fix or when copy mode is used:
# tools/testing/selftests/bpf/xdp_hw_metadata -c enp1s0
then RX timestamp is found and xdp_hw_metadata prints:
found skb hwtstamp = 1736509937.852786132
Fixes: 069b142f5819 ("igc: Add support for PTP .getcyclesx64()")
Signed-off-by: Zdenek Bouska <zdenek.bouska@xxxxxxxxxxx>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Reviewed-by: Florian Bezdeka <florian.bezdeka@xxxxxxxxxxx>
Reviewed-by: Song Yoong Siang <yoong.siang.song@xxxxxxxxx>
---
drivers/net/ethernet/intel/igc/igc_main.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
Tested-by: Mor Bar-Gabay <morx.bar.gabay@xxxxxxxxx>
