netdev - [PATCH net-next 3/3] selftests: drv-net: xdp: Validate single-buff XDP

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Message-ID: <20250821014023.1481662-4-dimitri.daskalakis1@gmail.com>
Date: Wed, 20 Aug 2025 18:40:23 -0700
From: Dimitri Daskalakis <dimitri.daskalakis1@...il.com>
To: "David S . Miller" <davem@...emloft.net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH net-next 3/3] 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: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Dimitri Daskalakis <dimitri.daskalakis1@...il.com>
---
 tools/testing/selftests/drivers/net/xdp.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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):
-- 
2.47.3