iflib: Add registration failure injection pointsHEADmain

Add six device-scoped fail(9) points at the registration milestones
needed to exercise each unwind path. An exact, runtime-only device
selector prevents unrelated iflib devices from consuming an armed point.

Mark the points non-sleepable because registration holds the ifnet and
context locks. Document one-shot operation and bus-address reprobe so a
failed attach can be recovered without another kernel build.

Reviewed by:	gallatin
MFC after:	2 weeks
Sponsored by:	BBOX.io
Differential Revision:	https://reviews.freebsd.org/D58722

0 files changed, 0 insertions, 0 deletions