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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