CVSROOT: /cvs
Module name: src
Changes by: [email protected] 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@
