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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1e42f73fd3
Same as initial tests, import verbatim from github.com/google/packetdrill, aside from: - update `source ./defaults.sh` path to adjust for flat dir - add SPDX headers - remove author statements if any - drop blank lines at EOF (new) Also import set_sysctls.py, which many scripts depend on to set sysctls and then restore them later. This is no longer strictly needed for namespacified sysctl. But not all sysctls are namespacified, and doesn't hurt if they are. Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20240912005317.1253001-3-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
119 lines
4.4 KiB
Plaintext
119 lines
4.4 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// tcp_MAX_SKB_FRAGS test
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//
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// Verify that sending an iovec of tcp_MAX_SKB_FRAGS + 1 elements will
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// 1) fit in a single packet without zerocopy
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// 2) spill over into a second packet with zerocopy,
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// because each iovec element becomes a frag
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// 3) the PSH bit is set on an skb when it runs out of fragments
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`./defaults.sh`
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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 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
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// Each pinned zerocopy page is fully accounted to skb->truesize.
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// This test generates a worst case packet with each frag storing
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// one byte, but increasing truesize with a page (64KB on PPC).
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+0 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [2000000], 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 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+0 < . 1:1(0) ack 1 win 257
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+0 accept(3, ..., ...) = 4
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// send an iov of 18 elements: just becomes a linear skb
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+0 sendmsg(4, {msg_name(...)=...,
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msg_iov(18)=[{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}],
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msg_flags=0}, 0) = 18
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+0 > P. 1:19(18) ack 1
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+0 < . 1:1(0) ack 19 win 257
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// send a zerocopy iov of 18 elements:
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+1 sendmsg(4, {msg_name(...)=...,
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msg_iov(18)=[{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}],
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msg_flags=0}, MSG_ZEROCOPY) = 18
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// verify that it is split in one skb of 17 frags + 1 of 1 frag
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// verify that both have the PSH bit set
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+0 > P. 19:36(17) ack 1
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+0 < . 1:1(0) ack 36 win 257
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+0 > P. 36:37(1) ack 1
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+0 < . 1:1(0) ack 37 win 257
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+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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// send a zerocopy iov of 64 elements:
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+0 sendmsg(4, {msg_name(...)=...,
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msg_iov(64)=[{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1},
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{..., 1}, {..., 1}, {..., 1}, {..., 1}],
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msg_flags=0}, MSG_ZEROCOPY) = 64
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// verify that it is split in skbs with 17 frags
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+0 > P. 37:54(17) ack 1
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+0 < . 1:1(0) ack 54 win 257
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+0 > P. 54:71(17) ack 1
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+0 < . 1:1(0) ack 71 win 257
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+0 > P. 71:88(17) ack 1
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+0 < . 1:1(0) ack 88 win 257
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+0 > P. 88:101(13) ack 1
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+0 < . 1:1(0) ack 101 win 257
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+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=1,
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ee_data=1}}
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]}, MSG_ERRQUEUE) = 0
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