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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
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test TCP_INQ and TCP_CM_INQ on the server side.
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--mss=1000
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`./defaults.sh
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`
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// Initialize 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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+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+.01 < . 1:1(0) ack 1 win 514
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// Accept the connection and enable TCP_INQ.
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+0 accept(3, ..., ...) = 4
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+0 setsockopt(4, SOL_TCP, TCP_INQ, [1], 4) = 0
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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
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// We read 2K and we should have 8K ready to read.
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+0 recvmsg(4, {msg_name(...)=...,
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msg_iov(1)=[{..., 2000}],
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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=8000}]}, 0) = 2000
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// We read 8K and we should have no further data ready to read.
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+0 recvmsg(4, {msg_name(...)=...,
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msg_iov(1)=[{..., 8000}],
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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) = 8000
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// Client 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
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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(4, {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 error.
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+0 read(3, ..., 2000) = -1 ENOTCONN (Transport endpoint is not connected)
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