CVSROOT: /cvs
Module name: src
Changes by: d...@cvs.openbsd.org 2021/06/20 20:38:18
Modified files:
usr.sbin/vmd : virtio.c virtio.h
Log message:
vmd(8): support variable length vionet rx descriptor chains
The original implementation of the virtio network device assumed a
driver would only provide a 2-descriptor chain for receiving packets.
The virtio spec allows for variable length chains and drivers, in
practice, construct them when they use a sufficiently large MTU.
This change lets the device use variable length chains provided by
the driver, thus allowing for drivers to set an MTU up to the
underlying host-side tap(4)'s limit of TUNMRU (16384).
Size limitations are now enforced on both tx and rx-side dropping
anything violating the underlying tap(4) min and max limits.
More work is needed to increase the read(2) buffer in use by vmd
to prevent packet truncation.
OK mlarkin@
