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f0600fe949
Three tests are cooking GSO packets but do not provide gso_size information to the kernel, triggering this message: TCP: tun0: Driver has suspect GRO implementation, TCP performance may be compromised. Add --mss option to avoid this warning. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250710155641.3028726-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
55 lines
1.8 KiB
Plaintext
55 lines
1.8 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test TCP_INQ and TCP_CM_INQ on the client side.
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--mss=1000
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`./defaults.sh
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`
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// Create a socket and set it to non-blocking.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
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+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
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// Connect to the server and enable TCP_INQ.
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+0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
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+0 setsockopt(3, SOL_TCP, TCP_INQ, [1], 4) = 0
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+0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
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+.01 < S. 0:0(0) ack 1 win 5792 <mss 1460,sackOK,TS val 700 ecr 100,nop,wscale 7>
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+0 > . 1:1(0) ack 1 <nop,nop,TS val 200 ecr 700>
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// Now we have 10K of data ready on the socket.
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+0 < . 1:10001(10000) ack 1 win 514
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+0 > . 1:1(0) ack 10001 <nop,nop,TS val 200 ecr 700>
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// We read 1K and we should have 9K ready to read.
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+0 recvmsg(3, {msg_name(...)=...,
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msg_iov(1)=[{..., 1000}],
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msg_flags=0,
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msg_control=[{cmsg_level=SOL_TCP,
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cmsg_type=TCP_CM_INQ,
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cmsg_data=9000}]}, 0) = 1000
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// We read 9K and we should have no further data ready to read.
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+0 recvmsg(3, {msg_name(...)=...,
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msg_iov(1)=[{..., 9000}],
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msg_flags=0,
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msg_control=[{cmsg_level=SOL_TCP,
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cmsg_type=TCP_CM_INQ,
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cmsg_data=0}]}, 0) = 9000
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// Server sends more data and closes the connections.
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+0 < F. 10001:20001(10000) ack 1 win 514
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+0 > . 1:1(0) ack 20002 <nop,nop,TS val 200 ecr 700>
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// We read 10K and we should have one "fake" byte because the connection is
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// closed.
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+0 recvmsg(3, {msg_name(...)=...,
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msg_iov(1)=[{..., 10000}],
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msg_flags=0,
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msg_control=[{cmsg_level=SOL_TCP,
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cmsg_type=TCP_CM_INQ,
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cmsg_data=1}]}, 0) = 10000
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// Now, receive EOF.
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+0 read(3, ..., 2000) = 0
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