Contributed by rueda on from the aggregating bonded trunks dept.
CVSROOT: /cvs Module name: src Changes by: email@example.com 2019/07/04 19:35:58 Added files: sys/net : if_aggr.c Log message: add aggr(4), a dedicated driver that implements 802.1AX link aggregation 802.1AX (formerly known as 802.3ad) describes the Link Aggregation Control Protocol (LACP) and how to use it in a bunch of different state machines to control when to bundle interfaces into an aggregation. technically the trunk(4) driver already implements support for 802.1AX, but it had a couple of problems i struggled to deal with as part of that driver. firstly, i couldnt easily make the output path in trunk mpsafe without getting bogged down, and the state machine handling had a few hard to diagnose edge cases that i couldnt figure out. the new driver has an mpsafe output path, and implements ifq bypass like vlan(4) does. this means output with aggr(4) is up to twice as fast as trunk(4). the implementation of the state machines as per the standard means the driver behaves more correctly in edge cases like when a physical link looks like it is up, but is logically unidirectional. the code has been good enough for me to use in production, but it does need more work. that can happen in tree now instead of carrying a large diff around. some testing by ccardenas@, hrvoje popovski, and jmatthew@ ok deraadt@ ccardenas@ jmatthew@
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