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6f66920539
Use the standard import and testing method, as described in the import of tcp/ecn and tcp/close , tcp/sack , tcp/tcp_info. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Soham Chakradeo <sohamch@google.com> Link: https://patch.msgid.link/20241217185203.297935-4-sohamch.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test for blocking write.
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--tolerance_usecs=10000
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`./defaults.sh
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./set_sysctls.py /proc/sys/net/ipv4/tcp_min_tso_segs=10
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`
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// Establish a connection.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 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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+.1 < S 0:0(0) win 50000 <mss 1000,nop,wscale 0>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
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+.1 < . 1:1(0) ack 1 win 50000
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+0 accept(3, ..., ...) = 4
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// Kernel doubles our value -> sk->sk_sndbuf is set to 42000
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+0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [21000], 4) = 0
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+0 getsockopt(4, SOL_SOCKET, SO_SNDBUF, [42000], [4]) = 0
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// A write of 60000 does not block.
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+0...0.300 write(4, ..., 61000) = 61000 // this write() blocks
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+.1 < . 1:1(0) ack 10001 win 50000
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+.1 < . 1:1(0) ack 30001 win 50000
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// This ACK should wakeup the write(). An ACK of 35001 does not.
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+.1 < . 1:1(0) ack 36001 win 50000
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// Reset to sysctls defaults.
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`/tmp/sysctl_restore_${PPID}.sh`
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