similar to: [PATCH 1/3] tun: Interface to query tun/tap features.

The problem with introducing checksum offload and gso to tun is they need to set dev->features to enable GSO and/or checksumming, which is supposed to be done before register_netdevice(), ie. as part of TUNSETIFF. Unfortunately, TUNSETIFF has always just ignored flags it doesn't understand, so there's no good way of detecting whether the kernel supports new IFF_ flags. This patch

The problem with introducing checksum offload and gso to tun is they need to set dev->features to enable GSO and/or checksumming, which is supposed to be done before register_netdevice(), ie. as part of TUNSETIFF. Unfortunately, TUNSETIFF has always just ignored flags it doesn't understand, so there's no good way of detecting whether the kernel supports new IFF_ flags. This patch

Rusty/Max, While adding support to KVM for IFF_VNET_HDR it became apparent that we need some way of querying a file descriptor for whether IFF_VNET_HDR has been set. Basically, some apps like libvirt open the tap fd, connect the interface to the appropriate bridge and pass the fd to kvm via the command line. So, those apps need to set IFF_VNET_HDR and KVM needs to be able to detect that and

Rusty/Max, While adding support to KVM for IFF_VNET_HDR it became apparent that we need some way of querying a file descriptor for whether IFF_VNET_HDR has been set. Basically, some apps like libvirt open the tap fd, connect the interface to the appropriate bridge and pass the fd to kvm via the command line. So, those apps need to set IFF_VNET_HDR and KVM needs to be able to detect that and

On Wed, Jun 15, 2016 at 04:38:17PM +0800, Jason Wang wrote: > We used to queue tx packets in sk_receive_queue, this is less > efficient since it requires spinlocks to synchronize between producer > and consumer. > > This patch tries to address this by: > > - introduce a new mode which will be only enabled with IFF_TX_ARRAY > set and switch from sk_receive_queue to a

We used to queue tx packets in sk_receive_queue, this is less efficient since it requires spinlocks to synchronize between producer and consumer. This patch tries to address this by: - introduce a new mode which will be only enabled with IFF_TX_ARRAY set and switch from sk_receive_queue to a fixed size of skb array with 256 entries in this mode. - introduce a new proto_ops peek_len which was

We used to queue tx packets in sk_receive_queue, this is less efficient since it requires spinlocks to synchronize between producer and consumer. This patch tries to address this by: - introduce a new mode which will be only enabled with IFF_TX_ARRAY set and switch from sk_receive_queue to a fixed size of skb array with 256 entries in this mode. - introduce a new proto_ops peek_len which was

The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers that are always little-endian. It can also be used to handle the special case of a legacy little-endian device implemented by a big-endian host. Let's add a flag and ioctls for big-endian devices as well. If both flags are set, little-endian wins. Since this is isn't a common usecase, the feature is controlled by a

The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers that are always little-endian. It can also be used to handle the special case of a legacy little-endian device implemented by a big-endian host. Let's add a flag and ioctls for big-endian devices as well. If both flags are set, little-endian wins. Since this is isn't a common usecase, the feature is controlled by a

On Tue, 21 Apr 2015 16:06:33 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Fri, Apr 10, 2015 at 12:20:21PM +0200, Greg Kurz wrote: > > The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers > > that are always little-endian. It can also be used to handle the special > > case of a legacy little-endian device implemented by a

On Fri, Apr 10, 2015 at 12:20:21PM +0200, Greg Kurz wrote: > The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers > that are always little-endian. It can also be used to handle the special > case of a legacy little-endian device implemented by a big-endian host. > > Let's add a flag and ioctls for big-endian devices as well. If both flags > are set,

On Fri, Apr 10, 2015 at 12:20:21PM +0200, Greg Kurz wrote: > The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers > that are always little-endian. It can also be used to handle the special > case of a legacy little-endian device implemented by a big-endian host. > > Let's add a flag and ioctls for big-endian devices as well. If both flags > are set,

Please see the following thread to get some context on this http://marc.info/?l=linux-netdev&m=121564433018903&w=2 Basically the issue is that current multi-cast filtering stuff in the TUN/TAP driver is seriously broken. Original patch went in without proper review and ACK. It was broken and confusing to start with and subsequent patches broke it completely. To give you an idea of

Please see the following thread to get some context on this http://marc.info/?l=linux-netdev&m=121564433018903&w=2 Basically the issue is that current multi-cast filtering stuff in the TUN/TAP driver is seriously broken. Original patch went in without proper review and ACK. It was broken and confusing to start with and subsequent patches broke it completely. To give you an idea of

plain text document attachment (lguest64-loader.patch) I noticed that the lguest loader code for i386 was in Documentation/lguest. Well, that's fine (I guess) but it can't just be for i386. So I made a separate directory to put the loader code in. So now we have: Documentation/lguest/i386/... for the lguest i386 loader. and Documentation/lguest/x86_64/... for the lguest x86_64

plain text document attachment (lguest64-loader.patch) I noticed that the lguest loader code for i386 was in Documentation/lguest. Well, that's fine (I guess) but it can't just be for i386. So I made a separate directory to put the loader code in. So now we have: Documentation/lguest/i386/... for the lguest i386 loader. and Documentation/lguest/x86_64/... for the lguest x86_64

From: Rusty Russell <rusty@rustcorp.com.au> A brief document describing how to use lguest. Because lguest doesn't have an ABI we also include an example launcher in the Documentation directory. [jmorris@namei.org: Fix up nat example in documentation] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Signed-off-by: James Morris

From: Rusty Russell <rusty@rustcorp.com.au> A brief document describing how to use lguest. Because lguest doesn't have an ABI we also include an example launcher in the Documentation directory. [jmorris@namei.org: Fix up nat example in documentation] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Signed-off-by: James Morris

multiple queue virtio-net: flow steering through host/guest cooperation Hello all: This is a rough series adds the guest/host cooperation of flow steering support based on Krish Kumar's multiple queue virtio-net driver patch 3/3 (http://lwn.net/Articles/467283/). This idea is simple, the backend pass the rxhash to the guest and guest would tell the backend the hash to queue mapping when

multiple queue virtio-net: flow steering through host/guest cooperation Hello all: This is a rough series adds the guest/host cooperation of flow steering support based on Krish Kumar's multiple queue virtio-net driver patch 3/3 (http://lwn.net/Articles/467283/). This idea is simple, the backend pass the rxhash to the guest and guest would tell the backend the hash to queue mapping when