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selftests: drv-net: xdp: Add a single-buffer XDP_TX test.

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Test single-buffer XDP_TX for packets with various payload sizes.
Update the socat TX command to generate packets with 0 length payloads.

Signed-off-by: Dimitri Daskalakis <dimitri.daskalakis1@gmail.com>
Link: https://patch.msgid.link/20250821014023.1481662-3-dimitri.daskalakis1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dimitri Daskalakis 2025-08-20 18:40:22 -07:00 committed by Jakub Kicinski
parent 91aacd8cef
commit d06d70eb6a
1 changed files with 22 additions and 1 deletions
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23
tools/testing/selftests/drivers/net/xdp.py
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@ -314,8 +314,13 @@ def _test_xdp_native_tx(cfg, bpf_info, payload_lens):
rx_udp = f"socat -{cfg.addr_ipver} -T 2 " + \
f"-u UDP-RECV:{port},reuseport STDOUT"
# Writing zero bytes to stdin gets ignored by socat,
# but with the shut-null flag socat generates a zero sized packet
# when the socket is closed.
tx_cmd_suffix = ",shut-null" if payload_len == 0 else ""
tx_udp = f"echo -n {test_string} | socat -t 2 " + \
f"-u STDIN UDP:{cfg.baddr}:{port}"
f"-u STDIN UDP:{cfg.baddr}:{port}{tx_cmd_suffix}"
with bkg(rx_udp, host=cfg.remote, exit_wait=True) as rnc:
wait_port_listen(port, proto="udp", host=cfg.remote)
@ -329,6 +334,21 @@ def _test_xdp_native_tx(cfg, bpf_info, payload_lens):
ksft_eq(stats[XDPStats.TX.value], expected_pkts, "TX stats mismatch")
def test_xdp_native_tx_sb(cfg):
"""
Tests the XDP_TX action for a single-buff case.
Args:
cfg: Configuration object containing network settings.
"""
bpf_info = BPFProgInfo("xdp_prog", "xdp_native.bpf.o", "xdp", 1500)
# Ensure there's enough room for an ETH / IP / UDP header
pkt_hdr_len = 42 if cfg.addr_ipver == "4" else 62
_test_xdp_native_tx(cfg, bpf_info, [0, 1500 // 2, 1500 - pkt_hdr_len])
def test_xdp_native_tx_mb(cfg):
"""
Tests the XDP_TX action for a multi-buff case.
@ -665,6 +685,7 @@ def main():
test_xdp_native_pass_mb,
test_xdp_native_drop_sb,
test_xdp_native_drop_mb,
test_xdp_native_tx_sb,
test_xdp_native_tx_mb,
test_xdp_native_adjst_tail_grow_data,
test_xdp_native_adjst_tail_shrnk_data,