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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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// send with MSG_ZEROCOPY on a non-established socket
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//
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// verify that a send in state TCP_CLOSE correctly aborts the zerocopy
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// operation, specifically it does not increment the zerocopy counter.
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//
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// First send on a closed socket and wait for (absent) notification.
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// Then connect and send and verify that notification nr. is zero.
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--send_omit_free // do not reuse send buffers with zerocopy
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`./defaults.sh`
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4
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+0 setsockopt(4, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
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+0 send(4, ..., 4000, MSG_ZEROCOPY) = -1 EPIPE (Broken pipe)
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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=[]}, MSG_ERRQUEUE) = -1 EAGAIN (Resource temporarily unavailable)
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+0...0 connect(4, ..., ...) = 0
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+0 > S 0:0(0) <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 8>
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+0 < S. 0:0(0) ack 1 win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
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+0 > . 1:1(0) ack 1
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+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
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+0 > P. 1:4001(4000) ack 1
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+0 < . 1:1(0) ack 4001 win 257
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+0 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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