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c01a6e5b2e
The --send_omit_free flag is needed for TCP zero copy tests, to ensure
that packetdrill doesn't free the send() buffer after the send() call.
Fixes: 1e42f73fd3 ("selftests/net: packetdrill: import tcp/zerocopy")
Closes: https://lore.kernel.org/netdev/20251124071831.4cbbf412@kernel.org/
Suggested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20251125234029.1320984-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
47 lines
1.7 KiB
Plaintext
47 lines
1.7 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Fastopen server zerocopy test:
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//
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// send data with MSG_FASTOPEN | MSG_ZEROCOPY and verify that the
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// kernel returns the notification ID.
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--send_omit_free // do not reuse send buffers with zerocopy
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`./defaults.sh
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./set_sysctls.py /proc/sys/net/ipv4/tcp_fastopen=0x207`
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// Set up a TFO server listening socket.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+.1 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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+0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [2], 4) = 0
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+0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
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// Client sends a SYN with data.
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+.1 < S 0:1000(1000) win 32792 <mss 1460,sackOK,nop,nop>
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+0 > S. 0:0(0) ack 1001 <mss 1460,nop,nop,sackOK>
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// Server accepts and replies with data.
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+.005 accept(3, ..., ...) = 4
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+0 read(4, ..., 1024) = 1000
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+0 sendto(4, ..., 1000, MSG_ZEROCOPY, ..., ...) = 1000
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+0 > P. 1:1001(1000) ack 1001
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+.05 < . 1001:1001(0) ack 1001 win 32792
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// Read from error queue: now has first zerocopy notification
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+0.1 recvmsg(4, {msg_name(...)=...,
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msg_iov(1)=[{...,0}],
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msg_flags=MSG_ERRQUEUE,
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msg_control=[
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{cmsg_level=CMSG_LEVEL_IP,
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cmsg_type=CMSG_TYPE_RECVERR,
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cmsg_data={ee_errno=0,
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ee_origin=SO_EE_ORIGIN_ZEROCOPY,
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ee_type=0,
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ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
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ee_info=0,
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ee_data=0}}
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]}, MSG_ERRQUEUE) = 0
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`/tmp/sysctl_restore_${PPID}.sh`
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