linux-stable.git/include/linux/virtio_net.h, branch linux-2.6.30.y

virtio: add missing include to virtio_net.h

2009-05-01T22:34:02+00:00

virtio_net.h uses the macro ETH_ALEN which is defined in linux/if_ether.h.
Discovered when hacking on virtio-over-pci patches.

Signed-off-by: Grant Likely 
Signed-off-by: David S. Miller

virtio_net: Add support for VLAN filtering in the hypervisor

2009-02-05T00:35:13+00:00

VLAN filtering allows the hypervisor to drop packets from VLANs
that we're not a part of, further reducing the number of extraneous
packets recieved.  This makes use of the VLAN virtqueue command class.
The CTRL_VLAN feature bit tells us whether the backend supports VLAN
filtering.

Signed-off-by: Alex Williamson 
Acked-by: Rusty Russell 
Signed-off-by: David S. Miller

virtio_net: Add a MAC filter table

2009-02-05T00:35:13+00:00

Make use of the MAC control virtqueue class to support a MAC
filter table.  The filter table is managed by the hypervisor.
We consider the table to be available if the CTRL_RX feature
bit is set.  We leave it to the hypervisor to manage the table
and enable promiscuous or all-multi mode as necessary depending
on the resources available to it.

Signed-off-by: Alex Williamson 
Acked-by: Rusty Russell 
Signed-off-by: David S. Miller

virtio_net: Add a set_rx_mode interface

2009-02-05T00:35:12+00:00

Make use of the RX_MODE control virtqueue class to enable the
set_rx_mode netdev interface.  This allows us to selectively
enable/disable promiscuous and allmulti mode so we don't see
packets we don't want.  For now, we automatically enable these
as needed if additional unicast or multicast addresses are
requested.

Signed-off-by: Alex Williamson 
Acked-by: Rusty Russell 
Signed-off-by: David S. Miller

virtio_net: Add a virtqueue for outbound control commands

2009-02-05T00:35:11+00:00

This will be used for RX mode, MAC filter table, VLAN filtering, etc...

The control transaction consists of one or more "out" sg entries and
one or more "in" sg entries.  The first out entry contains a header
defining the class and command.  Additional out entries may provide
data for the command.  The last in entry provides a status response
back from the command.

Virtqueues typically run asynchronous, running a callback function
when there's data in the channel.  We can't readily make use of this
in the command paths where we need to use this.  Instead, we kick
the virtqueue and spin.  The kick causes an I/O write, triggering an
immediate trap into the hypervisor.

Signed-off-by: Alex Williamson 
Acked-by: Rusty Russell 
Signed-off-by: David S. Miller

Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

2009-02-03T08:15:35+00:00

Conflicts:
	drivers/net/Kconfig

headers_check fix: linux/virtio_net.h

2009-01-30T18:43:08+00:00

fix the following 'make headers_check' warning:

  usr/include/linux/virtio_net.h:28: found __[us]{8,16,32,64} type without #include 

Signed-off-by: Jaswinder Singh Rajput

virtio_net: add link status handling

2009-01-21T22:34:53+00:00

Allow the host to inform us that the link is down by adding
a VIRTIO_NET_F_STATUS which indicates that device status is
available in virtio_net config.

This is currently useful for simulating link down conditions
(e.g. using proposed qemu 'set_link' monitor command) but
would also be needed if we were to support device assignment
via virtio.

Signed-off-by: Mark McLoughlin 
Signed-off-by: Rusty Russell  (added future masking)
Signed-off-by: David S. Miller

virtio_net: VIRTIO_NET_F_MSG_RXBUF (imprive rcv buffer allocation)

2008-11-17T06:41:34+00:00

If segmentation offload is enabled by the host, we currently allocate
maximum sized packet buffers and pass them to the host. This uses up
20 ring entries, allowing us to supply only 20 packet buffers to the
host with a 256 entry ring. This is a huge overhead when receiving
small packets, and is most keenly felt when receiving MTU sized
packets from off-host.

The VIRTIO_NET_F_MRG_RXBUF feature flag is set by hosts which support
using receive buffers which are smaller than the maximum packet size.
In order to transfer large packets to the guest, the host merges
together multiple receive buffers to form a larger logical buffer.
The number of merged buffers is returned to the guest via a field in
the virtio_net_hdr.

Make use of this support by supplying single page receive buffers to
the host. On receive, we extract the virtio_net_hdr, copy 128 bytes of
the payload to the skb's linear data buffer and adjust the fragment
offset to point to the remaining data. This ensures proper alignment
and allows us to not use any paged data for small packets. If the
payload occupies multiple pages, we simply append those pages as
fragments and free the associated skbs.

This scheme allows us to be efficient in our use of ring entries
while still supporting large packets. Benchmarking using netperf from
an external machine to a guest over a 10Gb/s network shows a 100%
improvement from ~1Gb/s to ~2Gb/s. With a local host->guest benchmark
with GSO disabled on the host side, throughput was seen to increase
from 700Mb/s to 1.7Gb/s.

Based on a patch from Herbert Xu.

Signed-off-by: Mark McLoughlin 
Signed-off-by: Rusty Russell  (use netdev_priv)
Signed-off-by: David S. Miller

virtio: clarify that ABI is usable by any implementations

2008-07-25T02:06:04+00:00

We want others to implement and use virtio, so it makes sense to BSD
license the non-__KERNEL__ parts of the headers to make this crystal
clear.

Signed-off-by: Rusty Russell 
Acked-by: Christian Borntraeger 
Acked-by: Mark McLoughlin 
Acked-by: Ryan Harper 
Acked-by: Eric Van Hensbergen 
Acked-by: Anthony Liguori