CVS commit: src/sys/arch/xen/xen

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

Module Name:    src
Committed By:   jdolecek
Date:           Sun Apr  5 17:26:47 UTC 2020

Modified Files:
        src/sys/arch/xen/xen: if_xennet_xenbus.c xennetback_xenbus.c

Log Message:
remove support for legacy rx-flip mode for xennet(4)/xvif(4), making
rx-copy (first shipped in NetBSD 6.0 in 2012) the only supported
mode

this is mostly to simplify maintenance and future development

rx-flip is not supported by Linux Dom0/DomU, and NetBSD Dom0/DomU
defaults to rx-copy for over 8 years now too, so there is little
need to keep the support for compatibility

besides compatibility there is no other reason to keep rx-flip -
page transfer is generally slower than copy due to necessary MMU/TLB
manipulation, especially on MP systems


To generate a diff of this commit:
cvs rdiff -u -r1.98 -r1.99 src/sys/arch/xen/xen/if_xennet_xenbus.c
cvs rdiff -u -r1.91 -r1.92 src/sys/arch/xen/xen/xennetback_xenbus.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.