Branch: refs/heads/master Home: https://github.com/kronosnet/kronosnet Commit: 16a9190616b3875232c7ad26efde6b2eb0cb2c1b https://github.com/kronosnet/kronosnet/commit/16a9190616b3875232c7ad26efde6… Author: Fabio M. Di Nitto <fdinitto(a)redhat.com> Date: 2019-08-12 (Mon, 12 Aug 2019) Changed paths: M libknet/Makefile.am M libknet/crypto.c M libknet/crypto_model.h M libknet/crypto_nss.c M libknet/crypto_openssl.c M libknet/internals.h M libknet/links.c A libknet/onwire.c M libknet/onwire.h M libknet/tests/Makefile.am M libknet/tests/api_knet_send_crypto.c A libknet/tests/fun_pmtud_crypto.c M libknet/threads_common.c M libknet/threads_pmtud.c Log Message: ----------- [PMTUd] rework the whole math to calculate MTU internal changes: - drop the concept of sec_header_size that was completely wrong and unnecessary - bump crypto API to version 3 due to the above change - clarify the difference between link->proto_overhead and link->status->proto_overhead. We cannot rename the status one as it would also change ABI. - add onwire.c with documentation on the packet format and what various len(s) mean in context. - add 3 new functions to calculate MTUs back and forth and use them around, hopefully with enough clarification on why things are done in a given way. - heavily change thread_pmtud.c to use those new facilities. - fix major calculation issues when using crypto (non-crypto was not affected by the problem). - fix checks around to make sure they match the new math. - fix padding calculation. - add functional PMTUd crypto test this test can take several hours (12+) and should be executed on a controlled environment since it automatically changes loopback MTU to run tests. - fix way the lowest MTU is calculated during a PMTUd run to avoid spurious double notifications. - drop redundant checks. user visible changes: - Global MTU is now calculated properly when using crypto and values will be in general bigger than before due to incorrect padding calculation in the previous implementation. Signed-off-by: Fabio M. Di Nitto <fdinitto(a)redhat.com> Commit: 434299300a2f23acd96f2f287939549ab2944411 https://github.com/kronosnet/kronosnet/commit/434299300a2f23acd96f2f2879395… Author: Fabio M. Di Nitto <fdinitto(a)redhat.com> Date: 2019-08-13 (Tue, 13 Aug 2019) Changed paths: M libknet/internals.h M libknet/links.c M libknet/links.h M libknet/threads_pmtud.c Log Message: ----------- [PMTUd] add dynamic pong timeout when using crypto problem originally reported by proxmox community, users observed that under pressure the MTU would flap back and forth between 2 values due to other node response timeout. implement a dynamic timeout multiplier when using crypto that should solve the problem in a more flexible fashion. When a timeout hits, those new logs will show: [knet]: [info] host: host: 1 (passive) best link: 0 (pri: 0) [knet]: [debug] pmtud: Starting PMTUD for host: 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (4) for host 1 link: 0 [knet]: [info] pmtud: PMTUD link change for host: 1 link: 0 from 469 to 65429 [knet]: [debug] pmtud: PMTUD completed for host: 1 link: 0 current link mtu: 65429 [knet]: [info] pmtud: Global data MTU changed to: 65429 [knet]: [debug] pmtud: Starting PMTUD for host: 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (8) for host 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (16) for host 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (32) for host 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (64) for host 1 link: 0 [knet]: [debug] pmtud: PMTUD completed for host: 1 link: 0 current link mtu: 65429 [knet]: [debug] pmtud: Starting PMTUD for host: 1 link: 0 [knet]: [debug] pmtud: Increasing PMTUd response timeout multiplier to (128) for host 1 link: 0 [knet]: [debug] pmtud: PMTUD completed for host: 1 link: 0 current link mtu: 65429 and when the latency reduces and it is safe to be more responsive again: [knet]: [debug] pmtud: Starting PMTUD for host: 1 link: 0 [knet]: [debug] pmtud: Decreasing PMTUd response timeout multiplier to (64) for host 1 link: 0 [knet]: [debug] pmtud: PMTUD completed for host: 1 link: 0 current link mtu: 65429 .... testing this patch on normal hosts is a bit challenging tho. Patch was tested by hardcoding a super low timeout here: diff --git a/libknet/threads_pmtud.c b/libknet/threads_pmtud.c index 4f0ba0f..5e2b89b 100644 --- a/libknet/threads_pmtud.c +++ b/libknet/threads_pmtud.c @@ -261,7 +271,8 @@ retry: /* * crypto, under pressure, is a royal PITA */ - pong_timeout_adj_tmp = dst_link->pong_timeout_adj * 2; + //pong_timeout_adj_tmp = dst_link->pong_timeout_adj * dst_link->pmtud_crypto_timeout_multiplier; + pong_timeout_adj_tmp = 30 * dst_link->pmtud_crypto_timeout_multiplier; } else { pong_timeout_adj_tmp = dst_link->pong_timeout_adj; } and using a long running version of api_knet_send_crypto_test with a short PMTUd setfreq (10 sec). Signed-off-by: Fabio M. Di Nitto <fdinitto(a)redhat.com> Commit: 5a49e03f40c85ae6bf0d0b0ab9e16c8128a53c36 https://github.com/kronosnet/kronosnet/commit/5a49e03f40c85ae6bf0d0b0ab9e16… Author: Fabio M. Di Nitto <fdinitto(a)redhat.com> Date: 2019-08-20 (Tue, 20 Aug 2019) Changed paths: M libknet/handle.c M libknet/internals.h M libknet/libknet.h M libknet/tests/api-check.mk A libknet/tests/api_knet_handle_pmtud_set.c M libknet/threads_pmtud.c M man/Makefile.am Log Message: ----------- [PMTUd] add ability to manually override MTU and disable PMTUd Signed-off-by: Fabio M. Di Nitto <fdinitto(a)redhat.com> Commit: 657f43fd4345afed3546181361bae6889c3c40d8 https://github.com/kronosnet/kronosnet/commit/657f43fd4345afed3546181361bae… Author: Fabio M. Di Nitto <fdinitto(a)redhat.com> Date: 2019-08-21 (Wed, 21 Aug 2019) Changed paths: M libknet/Makefile.am M libknet/crypto.c M libknet/crypto_model.h M libknet/crypto_nss.c M libknet/crypto_openssl.c M libknet/handle.c M libknet/internals.h M libknet/libknet.h M libknet/links.c M libknet/links.h A libknet/onwire.c M libknet/onwire.h M libknet/tests/Makefile.am M libknet/tests/api-check.mk A libknet/tests/api_knet_handle_pmtud_set.c M libknet/tests/api_knet_send_crypto.c A libknet/tests/fun_pmtud_crypto.c M libknet/threads_common.c M libknet/threads_pmtud.c M man/Makefile.am Log Message: ----------- Merge pull request #245 from kronosnet/pmtud-fixes [PMTUd] rework the whole math to calculate MTU Compare: https://github.com/kronosnet/kronosnet/compare/9a31008b5642...657f43fd4345