linux-stable.git/drivers/net/tun.c, branch v3.3

tun: don't hold network namespace by tun sockets

2012-03-13T00:14:00+00:00

v3: added previously removed sock_put() to the tun_release() callback, because
sk_release_kernel() doesn't drop the socket reference.

v2: sk_release_kernel() used for socket release. Dummy tun_release() is
required for sk_release_kernel() ---> sock_release() ---> sock->ops->release()
call.

TUN was designed to destroy it's socket on network namesapce shutdown. But this
will never happen for persistent device, because it's socket holds network
namespace.
This patch removes of holding network namespace by TUN socket and replaces it
by creating socket in init_net and then changing it's net it to desired one. On
shutdown socket is moved back to init_net prior to final put.

Signed-off-by: Stanislav Kinsbursky 
Signed-off-by: David S. Miller

Sweep away N/A fw_version dustbunnies from the .get_drvinfo routine of a number of drivers

2011-11-22T21:43:32+00:00

Per discussion with Ben Hutchings and David Miller, go through and
remove assignments of "N/A" to fw_version in various drivers'
.get_drvinfo routines.  While there clean-up some use of bare
constants and such.

Signed-off-by: Rick Jones 
Signed-off-by: David S. Miller

net: introduce and use netdev_features_t for device features sets

2011-11-16T22:43:10+00:00

v2:	add couple missing conversions in drivers
	split unexporting netdev_fix_features()
	implemented %pNF
	convert sock::sk_route_(no?)caps

Signed-off-by: Michał Mirosław 
Signed-off-by: David S. Miller

net: sweep-up some straglers in strlcpy conversion of .get_drvinfo routines

2011-11-16T22:38:55+00:00

Convert some remaining straglers' .get_drvinfo routines to use strlcpy
rather than strcpy/strncpy.

Signed-off-by: Rick Jones 
Signed-off-by: David S. Miller

net: remove use of ndo_set_multicast_list in drivers

2011-08-18T03:22:03+00:00

replace it by ndo_set_rx_mode

Signed-off-by: Jiri Pirko 
Signed-off-by: David S. Miller

net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared

2011-07-28T05:39:30+00:00

After the last patch, We are left in a state in which only drivers calling
ether_setup have IFF_TX_SKB_SHARING set (we assume that drivers touching real
hardware call ether_setup for their net_devices and don't hold any state in
their skbs.  There are a handful of drivers that violate this assumption of
course, and need to be fixed up.  This patch identifies those drivers, and marks
them as not being able to support the safe transmission of skbs by clearning the
IFF_TX_SKB_SHARING flag in priv_flags

Signed-off-by: Neil Horman 
CC: Karsten Keil 
CC: "David S. Miller" 
CC: Jay Vosburgh 
CC: Andy Gospodarek 
CC: Patrick McHardy 
CC: Krzysztof Halasa 
CC: "John W. Linville" 
CC: Greg Kroah-Hartman 
CC: Marcel Holtmann 
CC: Johannes Berg 
Signed-off-by: David S. Miller

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

2011-06-21T05:29:08+00:00

Conflicts:
	drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
	drivers/net/wireless/rtlwifi/pci.c
	net/netfilter/ipvs/ip_vs_core.c

tun: teach the tun/tap driver to support netpoll

2011-06-17T03:53:10+00:00

Commit 8d8fc29d02a33e4bd5f4fa47823c1fd386346093 changed the behavior of slave
devices in regards to netpoll.  Specifically it created a mutually exclusive
relationship between being a slave and a netpoll-capable device.  This creates
problems for KVM because guests relied on needing netconsole active on a slave
device to a bridge.  Ideally libvirtd could just attach netconsole to the bridge
device instead, but thats currently infeasible, because while the bridge device
supports netpoll, it requires that all slave interface also support it, but the
tun/tap driver currently does not.  The most direct solution is to teach tun/tap
to support netpoll, which is implemented by the patch below.

I've not tested this yet, but its pretty straightforward.

Signed-off-by: Neil Horman 
Reported-by: Rik van Riel 
CC: Rik van Riel 
CC: Maxim Krasnyansky 
CC: Cong Wang 
CC: "David S. Miller" 
Reviewed-by: Rik van Riel 
Tested-by: Rik van Riel 
Reviewed-by: WANG Cong 
Signed-off-by: David S. Miller

virtio_net: introduce VIRTIO_NET_HDR_F_DATA_VALID

2011-06-11T22:57:47+00:00

There's no need for the guest to validate the checksum if it have been
validated by host nics. So this patch introduces a new flag -
VIRTIO_NET_HDR_F_DATA_VALID which is used to bypass the checksum
examing in guest. The backend (tap/macvtap) may set this flag when
met skbs with CHECKSUM_UNNECESSARY to save cpu utilization.

No feature negotiation is needed as old driver just ignore this flag.

Iperf shows 12%-30% performance improvement for UDP traffic. For TCP,
when gro is on no difference as it produces skb with partial
checksum. But when gro is disabled, 20% or even higher improvement
could be measured by netperf.

Signed-off-by: Jason Wang 
Acked-by: Michael S. Tsirkin 
Signed-off-by: David S. Miller

tun: do not put self in waitq if doing a nonblock read

2011-06-09T07:27:10+00:00

Perf shows a relatively high rate (about 8%) race in
spin_lock_irqsave() when doing netperf between external host and
guest. It's mainly becuase the lock contention between the
tun_do_read() and tun_xmit_skb(), so this patch do not put self into
waitqueue to reduce this kind of race. After this patch, it drops to
4%.

Signed-off-by: Jason Wang 
Signed-off-by: Amos Kong 
Signed-off-by: David S. Miller