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mptcp: sockopt: add coverage for TCP_CORK and TCP_NODELAY
Add coverage for new socket options that allow changing behavior of Nagle's algorithm on MPTCP sockets. Link: https://lore.kernel.org/mptcp/20211123070708.2897469-1-max@internet.ru/T/ Link: multipath-tcp#75 Signed-off-by: Maxim Galaganov <max@internet.ru>
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| // derived from tcp/nagle/sockopt_cork_nodelay.pkt | ||
| --tolerance_usecs=100000 | ||
| `../common/defaults.sh` | ||
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| +0.0 socket(..., SOCK_STREAM, IPPROTO_MPTCP) = 3 | ||
| +0.0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 | ||
| +0.0 setsockopt(3, SOL_TCP, TCP_CORK, [1], 4) = 0 | ||
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| +0 bind(3, ..., ...) = 0 | ||
| +0 listen(3, 1) = 0 | ||
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| +0.0 < S 0:0(0) win 65535 <mss 1460, sackOK, TS val 4074410674 ecr 0, nop, wscale 8, mpcapable v1 flags[flag_h] nokey> | ||
| +0.0 > S. 0:0(0) ack 1 <mss 1460, sackOK, TS val 4074410674 ecr 4074410674, nop, wscale 8, mpcapable v1 flags[flag_h] key[skey]> | ||
| +0.0 < . 1:1(0) ack 1 win 256 <nop, nop, TS val 4074410674 ecr 4074410674, mpcapable v1 flags[flag_h] key[ckey=2, skey]> | ||
| +0 accept(3, ..., ...) = 4 | ||
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| // check that TCP_CORK was synced from listener | ||
| +0.0 getsockopt(4, SOL_TCP, TCP_CORK, [1], [4]) = 0 | ||
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| +0.0 write(4, ..., 40) = 40 | ||
| +0.05 write(4, ..., 40) = 40 | ||
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| // clearing TCP_CORK should push pending bytes out | ||
| +0.01 setsockopt(4, SOL_TCP, TCP_CORK, [0], 4) = 0 | ||
| +0.0 > P. 1:81(80) ack 1 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=1 dsn8=1 ssn=1 dll=80 nocs, nop, nop> | ||
| +0.01 < . 1:1(0) ack 81 win 256 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=81 nocs> | ||
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| // set TCP_CORK once again | ||
| +0.0 setsockopt(4, SOL_TCP, TCP_CORK, [1], 4) = 0 | ||
| +0.0 write(4, ..., 40) = 40 | ||
| +0.05 write(4, ..., 40) = 40 | ||
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| // setting TCP_NODELAY on a socket with TCP_CORK should push pending bytes out | ||
| +0.0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0 | ||
| +0.0 > P. 81:161(80) ack 1 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=1 dsn8=81 ssn=81 dll=80 nocs, nop, nop> | ||
| +0.1 < . 1:1(0) ack 161 win 256 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=161 nocs> | ||
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| // TCP_CORK has priority over TCP_NODELAY | ||
| +0.0 write(4, ..., 1) = 1 | ||
| +0.01 write(4, ..., 1) = 1 | ||
| +0.2 > P. 161:163(2) ack 1 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=1 dsn8=161 ssn=161 dll=2 nocs, nop, nop> | ||
| +0.0 < . 1:1(0) ack 163 win 256 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=163 nocs> | ||
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| // clearing TCP_CORK on the accepted connection (TCP_NODELAY stays enabled) | ||
| +0.01 setsockopt(4, SOL_TCP, TCP_CORK, [0], 4) = 0 | ||
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| // check that Nagle's algorithm is disabled | ||
| +0.0 write(4, ..., 1) = 1 | ||
| +0.01 write(4, ..., 1) = 1 | ||
| +0.0 > P. 163:164(1) ack 1 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=1 dsn8=163 ssn=163 dll=1 nocs, nop, nop> | ||
| +0.0 > P. 164:165(1) ack 1 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=1 dsn8=164 ssn=164 dll=1 nocs, nop, nop> | ||
| +0.0 < . 1:1(0) ack 165 win 256 <nop, nop, TS val 448955294 ecr 448955294, dss dack4=165 nocs> |