git: ifnet: Add comment for ringmap

[Sepherosa Ziehau]

commit a0964e9148392cdc050865e70d0b811b17dc61d6
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Thu May 25 11:19:49 2017 +0800

    ifnet: Add comment for ringmap

Summary of changes:
 sys/net/if.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 56 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/a0964e9148392cdc050865e70d0b811b17dc61d6


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