1// SPDX-License-Identifier: GPL-2.0 2// Test TCP does not append any data from consequent writes to the tail 3// skb created for the chunk. Also, when packets are retransmitted, they 4// will not be coalesce into the same skb. 5`./defaults.sh 6` 7 8// Initialize connection 9 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 10 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 11 +0 bind(3, ..., ...) = 0 12 +0 listen(3, 1) = 0 13 14 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10> 15 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 16 +.01 < . 1:1(0) ack 1 win 514 17 18 +0 accept(3, ..., ...) = 4 19 20// Write a 10400B chunk to fill the ICW, and have a 400 byte skb sitting on 21// the tail. 22 +0 write(4, ..., 10400) = 10400 23 24// Write 10 400B chunks with no coalescing options. 25 +0 send(4, ..., 400, MSG_EOR) = 400 26 +0 send(4, ..., 400, MSG_EOR) = 400 27 +0 send(4, ..., 400, MSG_EOR) = 400 28 +0 send(4, ..., 400, MSG_EOR) = 400 29 +0 send(4, ..., 400, MSG_EOR) = 400 30 +0 send(4, ..., 400, MSG_EOR) = 400 31 +0 send(4, ..., 400, MSG_EOR) = 400 32 +0 send(4, ..., 400, MSG_EOR) = 400 33 +0 send(4, ..., 400, MSG_EOR) = 400 34 +0 send(4, ..., 400, MSG_EOR) = 400 35// This chunk should not be appended to the skbs created for the previous chunk. 36 +0 write(4, ..., 10000) = 10000 37 38 +0 > P. 1:10001(10000) ack 1 39+.001 < . 1:1(0) ack 10001 win 514 40// Now we have enough room to send out the 2 x 400B packets out. 41 +0 > P. 10001:10801(800) ack 1 42// The 9 remaining 400B chunks should be sent as individual packets. 43 +0 > P. 10801:11201(400) ack 1 44 +0 > P. 11201:11601(400) ack 1 45 +0 > P. 11601:12001(400) ack 1 46 +0 > P. 12001:12401(400) ack 1 47 +0 > P. 12401:12801(400) ack 1 48 +0 > P. 12801:13201(400) ack 1 49 +0 > P. 13201:13601(400) ack 1 50 +0 > P. 13601:14001(400) ack 1 51 +0 > P. 14001:14401(400) ack 1 52// The last 10KB chunk should be sent separately. 53 +0 > P. 14401:24401(10000) ack 1 54 55+.001 < . 1:1(0) ack 10401 win 514 56+.001 < . 1:1(0) ack 10801 win 514 57+.001 < . 1:1(0) ack 11201 win 514 58+.001 < . 1:1(0) ack 11601 win 514 59+.001 < . 1:1(0) ack 12001 win 514 <sack 13201:14401,nop,nop> 60// TCP should fill the hole but no coalescing should happen, and all 61// retransmissions should be sent out as individual packets. 62 63// Note : This is timeout based retransmit. 64// Do not put +0 here or flakes will come back. 65+.004~+.008 > P. 12001:12401(400) ack 1 66 67+.001 < . 1:1(0) ack 12401 win 514 <sack 13201:14401,nop,nop> 68 +0 > P. 12401:12801(400) ack 1 69 +0 > P. 12801:13201(400) ack 1 70+.001 < . 1:1(0) ack 12801 win 514 <sack 13201:14401,nop,nop> 71+.001 < . 1:1(0) ack 14401 win 514 72+.001 < . 1:1(0) ack 24401 win 514 73