src-test/sys/modules/if_epair, branch main

src-test/sys/modules/if_epair, branch main FreeBSD source tree https://cgit-dev.freebsd.org/src-test/atom?h=main 2017-03-04T10:10:17Z sys/modules: normalize .CURDIR-relative paths to SRCTOP 2017-03-04T10:10:17Z Enji Cooper ngie@FreeBSD.org 2017-03-04T10:10:17Z urn:sha1:193d9e768ba63fcfb187cfd17f461f7d41345048 This simplifies make output/logic Tested with: `cd sys/modules; make ALL_MODULES=` on amd64 MFC after: 1 month Sponsored by: Dell EMC Isilon Update epair(4) to the new netisr implementation and polish 2009-07-26T12:20:07Z Bjoern A. Zeeb bz@FreeBSD.org 2009-07-26T12:20:07Z urn:sha1:d0ea47437ad928a5d83c2000054536579b440be9 things a bit: - use dpcpu data to track the ifps with packets queued up, - per-cpu locking and driver flags - along with .nh_drainedcpu and NETISR_POLICY_CPU. - Put the mbufs in flight reference count, preventing interfaces from going away, under INVARIANTS as this is a general problem of the stack and should be solved in if.c/netisr but still good to verify the internal queuing logic. - Permit changing the MTU to virtually everythinkg like we do for loopback. Hook epair(4) up to the build. Approved by: re (kib)