From: Dimitri Daskalakis Date: Thu, 21 Aug 2025 01:40:23 +0000 (-0700) Subject: selftests: drv-net: xdp: Validate single-buff XDP_TX in multi-buff mode X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=bbd885b193cc8a651e18eef74f0e094acbc802b8;p=users%2Fgriffoul%2Flinux.git selftests: drv-net: xdp: Validate single-buff XDP_TX in multi-buff mode Validate that drivers with multi-buff XDP programs properly reinitialize xdp_buff between packets. Signed-off-by: Dimitri Daskalakis Link: https://patch.msgid.link/20250821014023.1481662-4-dimitri.daskalakis1@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/tools/testing/selftests/drivers/net/xdp.py b/tools/testing/selftests/drivers/net/xdp.py index cea24c9b573e..35e9495cd506 100755 --- a/tools/testing/selftests/drivers/net/xdp.py +++ b/tools/testing/selftests/drivers/net/xdp.py @@ -358,7 +358,10 @@ def test_xdp_native_tx_mb(cfg): """ bpf_info = BPFProgInfo("xdp_prog_frags", "xdp_native.bpf.o", "xdp.frags", 9000) - _test_xdp_native_tx(cfg, bpf_info, [8000]) + # The first packet ensures we exercise the fragmented code path. + # And the subsequent 0-sized packet ensures the driver + # reinitializes xdp_buff correctly. + _test_xdp_native_tx(cfg, bpf_info, [8000, 0]) def _validate_res(res, offset_lst, pkt_sz_lst):