]> git.baikalelectronics.ru Git - kernel.git/commit
virtio: add explicit big-endian support to memory accessors
authorGreg Kurz <gkurz@linux.vnet.ibm.com>
Fri, 24 Apr 2015 12:26:24 +0000 (14:26 +0200)
committerMichael S. Tsirkin <mst@redhat.com>
Mon, 1 Jun 2015 13:48:54 +0000 (15:48 +0200)
commit7cda1c3eecbca1a41a411526cd6fdbd4b02eb4c0
treeff910c555820a2bf0fbd7b17231fa75d0cea5427
parent60fb02039b7b1853565f3c8ab326ac1cc7c3604b
virtio: add explicit big-endian support to memory accessors

The current memory accessors logic is:
- little endian if little_endian
- native endian (i.e. no byteswap) if !little_endian

If we want to fully support cross-endian vhost, we also need to be
able to convert to big endian.

Instead of changing the little_endian argument to some 3-value enum, this
patch changes the logic to:
- little endian if little_endian
- big endian if !little_endian

The native endian case is handled by all users with a trivial helper. This
patch doesn't change any functionality, nor it does add overhead.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
drivers/net/macvtap.c
drivers/net/tun.c
drivers/vhost/vhost.h
include/linux/virtio_byteorder.h
include/linux/virtio_config.h
include/linux/vringh.h