From: "Michael S. Tsirkin" <mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: David Miller <davem@davemloft.net>,
cornelia.huck@de.ibm.com, rusty@au1.ibm.com, nab@linux-iscsi.org,
pbonzini@redhat.com, thuth@linux.vnet.ibm.com,
dahi@linux.vnet.ibm.com, netdev@vger.kernel.org,
linux-api@vger.kernel.org
Subject: [PATCH v8 39/50] tun: add VNET_LE flag
Date: Mon, 1 Dec 2014 18:06:01 +0200 [thread overview]
Message-ID: <1417449619-24896-40-git-send-email-mst@redhat.com> (raw)
In-Reply-To: <1417449619-24896-1-git-send-email-mst@redhat.com>
virtio 1.0 modified virtio net header format,
making all fields little endian.
Users can tweak header format before submitting it to tun,
but this means more data copies where none were necessary.
And if the iovec is in RO memory, this means we might
need to split iovec also means we might in theory overflow
iovec max size.
This patch adds a simpler way for applications to handle this,
using new "little endian" flag in tun.
As a result, tun simply byte-swaps header fields as appropriate.
This is a NOP on LE architectures.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/uapi/linux/if_tun.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 277a260..18b2403 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -57,6 +57,7 @@
#define IFF_ONE_QUEUE 0x2000
#define IFF_VNET_HDR 0x4000
#define IFF_TUN_EXCL 0x8000
+#define IFF_VNET_LE 0x10000
#define IFF_MULTI_QUEUE 0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400
--
MST
next prev parent reply other threads:[~2014-12-01 16:46 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-01 16:02 [PATCH v8 00/50] linux: towards virtio-1 guest support Michael S. Tsirkin
2014-12-01 16:02 ` [PATCH v8 01/50] virtio: add low-level APIs for feature bits Michael S. Tsirkin
2014-12-01 16:02 ` [PATCH v8 02/50] virtio: use u32, not bitmap for features Michael S. Tsirkin
2014-12-01 16:02 ` [PATCH v8 03/50] mic_virtio: robust feature array size calculation Michael S. Tsirkin
2014-12-02 10:13 ` Thomas Huth
2014-12-01 16:03 ` [PATCH v8 04/50] virtio: add support for 64 bit features Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 05/50] virtio: assert 32 bit features in transports Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 06/50] virtio_ccw: add support for 64 bit features Michael S. Tsirkin
2014-12-02 11:14 ` Thomas Huth
2014-12-01 16:03 ` [PATCH v8 07/50] virtio: add virtio 1.0 feature bit Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 08/50] virtio: memory access APIs Michael S. Tsirkin
2014-12-03 0:48 ` Prabhakar Lad
2014-12-01 16:03 ` [PATCH v8 09/50] virtio_ring: switch to new " Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 10/50] virtio_config: endian conversion for v1.0 Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 11/50] virtio: allow transports to get avail/used addresses Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 12/50] virtio: set FEATURES_OK Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 13/50] virtio: simplify feature bit handling Michael S. Tsirkin
2014-12-01 16:03 ` [PATCH v8 14/50] virtio: add legacy feature table support Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 15/50] virtio_net: v1.0 endianness Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 16/50] virtio_blk: v1.0 support Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 17/50] KVM: s390: Set virtio-ccw transport revision Michael S. Tsirkin
2014-12-04 16:10 ` Michael S. Tsirkin
2014-12-04 16:19 ` Cornelia Huck
2014-12-01 16:04 ` [PATCH v8 18/50] KVM: s390: virtio-ccw revision 1 SET_VQ Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 19/50] KVM: s390 allow virtio_ccw status writes to fail Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 20/50] KVM: s390: enable virtio-ccw revision 1 Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 21/50] virtio_blk: make serial attribute static Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 22/50] virtio_blk: fix race at module removal Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 23/50] virtio_net: pass vi around Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 24/50] virtio_net: get rid of virtio_net_hdr/skb_vnet_hdr Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 25/50] virtio_net: stricter short buffer length checks Michael S. Tsirkin
2014-12-01 16:04 ` [PATCH v8 26/50] virtio_net: bigger header when VERSION_1 is set Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 27/50] virtio_net: disable mac write for virtio 1.0 Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 28/50] virtio_net: enable v1.0 support Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 29/50] vhost: make features 64 bit Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 30/50] vhost: add memory access wrappers Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 31/50] vhost/net: force len for TX to host endian Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 32/50] vhost: switch to __get/__put_user exclusively Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 33/50] vhost: virtio 1.0 endian-ness support Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 34/50] vhost/net: virtio 1.0 byte swap Michael S. Tsirkin
2015-01-06 23:55 ` Alex Williamson
2015-01-07 8:31 ` Greg Kurz
2015-01-07 8:57 ` Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 35/50] vhost/net: larger header for virtio 1.0 Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 36/50] vhost/net: enable " Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 37/50] tun: move internal flag defines out of uapi Michael S. Tsirkin
2014-12-01 16:05 ` [PATCH v8 38/50] tun: drop most type defines Michael S. Tsirkin
2014-12-01 16:06 ` Michael S. Tsirkin [this message]
2014-12-01 16:06 ` [PATCH v8 40/50] tun: TUN_VNET_LE support, fix sparse warnings for virtio headers Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 41/50] macvtap: TUN_VNET_LE support Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 42/50] virtio_scsi: v1.0 support Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 43/50] virtio_scsi: move to uapi Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 44/50] virtio_scsi: export to userspace Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 45/50] vhost/scsi: partial virtio 1.0 support Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 46/50] af_packet: virtio 1.0 stubs Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 47/50] virtio_console: virtio 1.0 support Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 48/50] virtio_balloon: add legacy_only flag Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 49/50] virtio: make VIRTIO_F_VERSION_1 a transport bit Michael S. Tsirkin
2014-12-01 16:06 ` [PATCH v8 50/50] virtio: drop VIRTIO_F_VERSION_1 from drivers Michael S. Tsirkin
2014-12-08 8:58 ` [PATCH v8 00/50] linux: towards virtio-1 guest support Michael S. Tsirkin
2014-12-09 0:33 ` David Miller
2014-12-10 23:09 ` Rusty Russell
2014-12-10 19:14 ` Michael S. Tsirkin
2014-12-12 23:48 ` Nicholas A. Bellinger
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