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path: root/src/vnet/tcp/tcp_input.c
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2017-09-20tcp: add option to punt trafficPierre Pfister1-5/+17
Until now, if the stack didn't find a connection for a packet, it sent back a reset. With the punt option enabled, packets are now enqueued to error-punt where they can be handed off to the host os. Change-Id: I12dea8694b8bd24c92b0d601412928aa7b8046cb Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Pierre Pfister <ppfister@cisco.com>
2017-09-19session/tcp: improve preallocated segment handlingFlorin Coras1-39/+42
- add preallocated segment flag - don't remove pre-allocated segments except if application detaches - when preallocating fifos in multiple segments, completely fill a segment before moving to the next - detach server application from segment-managers when deleting app - batch syn/syn-ack/fin (re)transmissions - loosen up close-wait and time-wait times Change-Id: I412f53ce601cc83b3acc26aeffd7fa2d52d73b03 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-09-12tcp: horizontal scaling improvmentsFlorin Coras1-58/+146
- do not scale syn-ack window - fix the max number of outstanding syns in builtin client - fix syn-sent ack validation to use modulo arithmetic - improve retransmit timer handler - fix output buffer allocator leakeage - improved debugging Change-Id: Iac3bc0eadf7d0b494a93e22d210a3153b61b3273 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-30tcp: re-enable persist timer if no data available to sendFlorin Coras1-0/+1
Additionally, flush rx fifos for closed sessions. Change-Id: If2cc563fbda0451e7572650e98b15f0a694a0ff9 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-25TCP horizontal scalingDave Barach1-1/+5
- Remove frame handoff support machinery. We haven't used it in a long time. - Configuration support for the local endpoints bihash table - Drop lookup failure packets in tcp46_syn_sent Change-Id: Icd51e6785f74661c741e76fac23d21c4cc998d17 Signed-off-by: Dave Barach <dave@barachs.net>
2017-08-25tcp: retransmit and multi-buffer segment fixes and improvementsFlorin Coras1-11/+16
- set session state as closed on session manager delete - enable retransmit as opposed to persist timer after persist timer completes - properly discard buffer chain bytes when new data overlaps ooo segments - don't use rxt bytes in snd space estimate used on tx path Change-Id: Id9cab686e532e5fe70c775d5440260e8eb890a9f Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-16tcp: fix v6 sessionsroot1-15/+1
Change-Id: Ia6dd5e948b17b2f3866fe70838eabb09e35415e1 Signed-off-by: Dave Barach <dbarach@cisco.com> Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-15tcp: state machine improvementsFlorin Coras1-10/+20
- Add SYN_RCVD timeout - Fix FIN_WAIT_1 to CLOSING transition Change-Id: I42ca7fc087f6fdfae15bd7a6175dd3226ed341c7 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-14TCP: Update time_now once per burstFlorin Coras1-1/+1
Change-Id: I58089d7a9867ede9d8a36b2aea62edef04cb5b81 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-11Fix tcp multi buffer segments retransmissionFlorin Coras1-11/+37
- Fix tcp/udp sw checksum computation - Fix allocation of multi buffer tcp segments for retransmits - Send FIN only if/when tx fifo is empty Change-Id: I2e43a14b87a72c9e547b4339b9a51811cf5732c4 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-08-02Fix tcp tx buffer allocationFlorin Coras1-0/+2
- Make tcp output buffer allocation macro an inline function - Use per ip version per thread tx frames for retransmits and timer events - Fix / parameterize tcp data structure preallocation - Add a couple of gdb-callable show commands - Fix local endpoint cleanup Change-Id: I67b47b7570aa14cb4634b6fd93c57cd2eacbfa29 Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-07-30Make tcp active open data structures thread safeFlorin Coras1-15/+21
- Cleanup half-open connections and timers on the right thread - Ensure half-open connection and transport endpoint pools are thread safe - Enqueue TX events to the correct vpp thread in the builtin client - Use transport proto in transport connections instead of session type Change-Id: Id13239a206afbff6f34a38afa510fe014e4b2049 Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-07-25Cleanup/refactor session layer codeFlorin Coras1-1/+4
Change-Id: Ica99e8cb919fca6b069c37c969d60e8ccc2c6bf9 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-07-21Improvements to tcp rx path and debuggingFlorin Coras1-66/+99
- Increment rcv_nxt for fin packets - Call tcp_segment_rcv only if buffer has data - Parse rcv opts before deleting half-open connection - Fix initial rcv_wnd - Improved event logging Change-Id: I9b83c04f432c4cec832c480b03e534deff02c3b1 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-07-15Fixes and improved tcp/session debuggingFlorin Coras1-35/+79
- Fix rx sack option parsing - Add session sack scoreboard tracing and replaying - Add svm fifo tracing and replaying - Scoreboard/svm fifo ooo segment reception fixes - Improved overall debugging Change-Id: Ieae07eba355e66f5935253232bb00f2dfb7ece00 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-07-11Horizontal (nSessions) scaling draftDave Barach1-34/+63
- Data structure preallocation. - Input state machine fixes for mid-stream 3-way handshake retries. - Batch connections in the builtin_client - Multiple private fifo segment support - Fix elog simultaneous event type registration - Fix sacks when segment hole is added after highest sacked - Add "accepting" session state for sessions pending accept - Add ssvm non-recursive locking - Estimate RTT for syn-ack - Don't init fifo pointers. We're using relative offsets for ooo segments - CLI to dump individual session Change-Id: Ie0598563fd246537bafba4feed7985478ea1d415 Signed-off-by: Dave Barach <dbarach@cisco.com> Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-06-19Overall tcp performance improvements (VPP-846)Florin Coras1-83/+110
- limit minimum rto per connection - cleanup sack scoreboard - switched svm fifo out-of-order data handling from absolute offsets to relative offsets. - improve cwnd handling when using sacks - add cc event debug stats - improved uri tcp test client/server: bugfixes and added half-duplex mode - expanded builtin client/server - updated uri socket client/server code to work in half-duplex - ensure session node unsets fifo event for empty fifo - fix session detach Change-Id: Ia446972340e32a65e0694ee2844355167d0c170d Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-06-09Implement sack based tcp loss recovery (RFC 6675)Florin Coras1-186/+485
- refactor existing congestion control code (RFC 6582/5681). Handling of ack feedback now consists of: ack parsing, cc event detection, event handling, congestion control update - extend sack scoreboard to support sack based retransmissions - basic implementation of Eifel detection algorithm (RFC 3522) for detecting spurious retransmissions - actually initialize the per-thread frame freelist hash tables - increase worker stack size to 2mb - fix session queue node out-of-buffer handling - ensure that the local buffer cache vec_len matches reality - avoid 2x spurious event requeues when short of buffers - count out-of-buffer events - make the builtin server thread-safe - fix bihash template threading issue: need to paint -1 across uninitialized working_copy_length vector elements (via rebase from master) Change-Id: I646cb9f1add9a67d08f4a87badbcb117980ebfc4 Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dbarach@cisco.com>
2017-05-20Improve session debuggingFlorin Coras1-9/+16
Also improves builtin client code. Change-Id: I8bca1aa632028f95c373726efb0abf2ee0eff414 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-18Improve sack bytes accounting and testingFlorin Coras1-18/+27
Change-Id: Iabeda0d0615b0f6fe20dd00611cb4c594d90b7eb Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-16Fixes to tcp active opens and receptionDave Barach1-0/+5
- Properly initialize connection index - Add new session to main hash table - Drop packets that are completely in the past with respect to the rcv wnd (e.g., retransmits due to premature timer pops) Change-Id: Ic0873018ff0a4c59e0913863dc7f0c0f822d5c34 Signed-off-by: Dave Barach <dbarach@cisco.com> Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-10Improve TCP option handling, VPP-757Florin Coras1-10/+37
Change-Id: Ica634536387d1196366ec96c52770287fcab0768 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-10Ignore data in RST segments, VPP-723Florin Coras1-15/+23
Change-Id: I01650b3b10b79ec549be0d5eceb0e318c06fcb50 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-09Add support for tcp/session buffer chainsFlorin Coras1-8/+8
Change-Id: I01c6e3dc3a1b2785df37bb66b19c4b5cbb8f3211 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-07Include TCP options in segment size computationFlorin Coras1-1/+5
Ensure that TCP data plus options does not exceed peer's advertised MSS. Change-Id: I0de824cb3619346f0394dd694942fc1cf33a82b7 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-07Fix TCP loss recovery, VPP-745Florin Coras1-10/+25
Allows pure loss recovery retransmits only on timeout. Change-Id: I563cdbf9e7b890a6569350bdbda4f746ace0544e Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-05-01TCP ooo reception fixesFlorin Coras1-26/+55
- Improve svm fifo handling of out-of-order segments - Ensure tsval_recent is updated only if rcv_las falls withing the segments's sequence space - Avoid directly dropping old ACKs - Improve debugging Change-Id: I88dbe2394a0ad7eb389a4cc12d013a13733953aa Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-04-25Session/tcp coverity fixesFlorin Coras1-96/+69
Change-Id: Ic5467df16e870b49c49678b1dbb40f4a2390b3c9 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-04-25Add sack tx unit testFlorin Coras1-14/+28
Change-Id: Ib91db6e531231bdc52b0104673a912bee024872f Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-04-24Debug CLI to magically create / delete a TCP sessionDave Barach1-1/+1
The session ends up in established state, and is hand-crafted to look like it was created by the builtin_server. This will come in handy for injecting packets into tcp46-established, along with ancillary debug CLI to adjust connection parameters. Immediate applications include screwball window cases, out of order segments, paws checking, and so on and so forth. Debug CLI script: loop create set int ip address loop0 6.0.1.1/8 set int state loop0 up set ip arp loop0 6.0.1.2 feed.face.babe test tcp server test tcp session packet-generator new { name tcp limit 1 node ip4-input size 100-100 interface loop0 no-recycle data { TCP: 6.0.1.2 -> 6.0.1.1 TCP: 11234 -> 1234 ACK window 2000 seqnum 0 acknum 0 incrementing 100 } } Change-Id: I866c2159376064b7d14f70531022c1fe949258c2 Signed-off-by: Dave Barach <dave@barachs.net>
2017-04-24Session layer improvementsFlorin Coras1-4/+4
Among others: - Moved app event queue to shared memory segment - Use private memory segment for builtin apps - Remove pid from svm fifo - Protect session fifo (de)allocation - Use fifo event for session disconnects - Have session queue node poll in all wk threads Change-Id: I89dbf7fdfebef12f5ef2b34ba3ef3c2c07f49ff2 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-04-18Fix fifo ooo bugs and improve testingDave Barach1-9/+19
Change-Id: If3c01e318bcb740ca5b240c63f712e2167082a80 Signed-off-by: Dave Barach <dave@barachs.net> Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-04-14tcp: completed trace functionsClement Durand1-28/+72
* Populated the trace struct that weren't used before * Modified and created format functions to format tcp packets and connections * Completed the node definitions to add the format_trace function * Filled the tracing parts with `vlib_add_trace' calls in each tcp node function For the nodes in tcp_input.c, there is a verbose trace and a non-verbose trace. Each packet goes through tcp[4-6]-input which is traced with `format_tcp_rx_trace', and the other nodes are traced with `format_tcp_rx_trace_short'. Change-Id: I4f2eed023f5973c14343132a33b06131cf063aa2 Signed-off-by: Pierre Pfister <ppfister@cisco.com> Signed-off-by: Clement Durand <clement.durand@polytechnique.edu>
2017-04-13Session layer refactoringFlorin Coras1-6/+1
Major refactoring of the session layer api - Add attatch api for application binding to the the session layer - Simplify listen/connect calls - Update application CLI - Add transport endpoint to accept callback - Associate segment manager to application and allow for multiple binds/connects per app Additional: - svm fifo cleanup - add fifo free, format fns - add fifo offset enqueue unit test Change-Id: Id93a65047de61afc2bf3d58c9b544339c02065af Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-04-06Use thread local storage for thread indexDamjan Marion1-5/+5
This patch deprecates stack-based thread identification, Also removes requirement that thread stacks are adjacent. Finally, possibly annoying for some folks, it renames all occurences of cpu_index and cpu_number with thread index. Using word "cpu" is misleading here as thread can be migrated ti different CPU, and also it is not related to linux cpu index. Change-Id: I68cdaf661e701d2336fc953dcb9978d10a70f7c1 Signed-off-by: Damjan Marion <damarion@cisco.com>
2017-04-02TCP cc/window management fixes and debuggingFlorin Coras1-33/+35
- added persist timer - update rcv_las whenever sending an ack - moved fifo size to its own cache line - improved session and builtin client debugging Change-Id: Ia649cf942cf0c061a713e8b67f0eb6974a6cd55b Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-03-27TCP/session improvementsFlorin Coras1-180/+327
- Added svm fifo flag for tracking fifo dequeue events (replaces event length). Updated all code to switch to the new scheme. - More session debugging - Fix peek index wrap - Add a trivial socket test client - Fast retransmit/cc fixes - tx and rx SACK fixes and unit testing - SRTT computation fix - remove dupack/ack burst filters - improve ack rx - improved segment rx - builtin client test code Change-Id: Ic4eb2d5ca446eb2260ccd3ccbcdaa73c64e7f4e1 Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dbarach@cisco.com>
2017-03-13VPP-659 Improve tcp/session debugging and testingFlorin Coras1-22/+12
- event-logging support for tcp and session layer - improvements to uri test code - builtin_server on port 1234 - use the CLOSEWAIT timer when we rx FIN in FIN_WAIT_2 state Change-Id: Ibc445f164b2086b20323bf89c77cffd3059f570f Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dbarach@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-03-10VPP-659 TCP improvementsFlorin Coras1-19/+44
- builtin test echo server - fix SYN-ACK retransmit canceling - avoid sending spurious ACK if in LAST_ACK - improved client dummy test app - renamed tx fifo dequeuing and sending functions to avoid confusion - improved RST handling Change-Id: Ia14aad3df319540dcf6e6a4e18a9f8d423a4b83b Signed-off-by: Florin Coras <fcoras@cisco.com> Signed-off-by: Dave Barach <dave@barachs.net>
2017-03-04Cleanup URI code and TCP bugfixingFlorin Coras1-22/+34
- Add CLI/API to enable session layer, by default it's disabled - Improve rcv wnd computation - Improvements to tx path - URI code cleanup - Builtin test tcp server - Improve src port allocation Change-Id: I2ace498e76a0771d4c31a8075cc14fe33d7dfa38 Signed-off-by: Florin Coras <fcoras@cisco.com>
2017-03-01VPP-598: tcp stack initial commitDave Barach1-0/+2316
Change-Id: I49e5ce0aae6e4ff634024387ceaf7dbc432a0351 Signed-off-by: Dave Barach <dave@barachs.net> Signed-off-by: Florin Coras <fcoras@cisco.com>