linux-toradex.git/include/linux/if.h, branch tegra-10.9.9

net: release dst entry in dev_hard_start_xmit()

2009-05-19T05:19:19+00:00

One point of contention in high network loads is the dst_release() performed
when a transmited skb is freed. This is because NIC tx completion calls
dev_kree_skb() long after original call to dev_queue_xmit(skb).

CPU cache is cold and the atomic op in dst_release() stalls. On SMP, this is
quite visible if one CPU is 100% handling softirqs for a network device,
since dst_clone() is done by other cpus, involving cache line ping pongs.

It seems right place to release dst is in dev_hard_start_xmit(), for most
devices but ones that are virtual, and some exceptions.

David Miller suggested to define a new device flag, set in alloc_netdev_mq()
(so that most devices set it at init time), and carefuly unset in devices
which dont want a NULL skb->dst in their ndo_start_xmit().

List of devices that must clear this flag is :

- loopback device, because it calls netif_rx() and quoting Patrick :
    "ip_route_input() doesn't accept loopback addresses, so loopback packets
     already need to have a dst_entry attached."
- appletalk/ipddp.c : needs skb->dst in its xmit function

- And all devices that call again dev_queue_xmit() from their xmit function
(as some classifiers need skb->dst) : bonding, vlan, macvlan, eql, ifb, hdlc_fr

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

WAN: Generic HDLC now uses IFF_WAN_HDLC private flag.

2009-01-21T22:03:35+00:00

Signed-off-by: Krzysztof Hałasa 
Signed-off-by: David S. Miller

bonding, net: Move last_rx update into bonding recv logic

2008-11-04T02:16:50+00:00

	The only user of the net_device->last_rx field is bonding.
This patch adds a conditional update of last_rx to the bonding special
logic in skb_bond_should_drop, causing last_rx to only be updated when
the ARP monitor is running.

	This frees network device drivers from the necessity of
updating last_rx, which can have cache line thrash issues.

Signed-off-by: Jay Vosburgh 
Signed-off-by: David S. Miller

net: network device name ifalias support

2008-09-23T04:28:11+00:00

This patch add support for keeping an additional character alias
associated with an network interface. This is useful for maintaining
the SNMP ifAlias value which is a user defined value. Routers use this
to hold information like which circuit or line it is connected to. It
is just an arbitrary text label on the network device.

There are two exposed interfaces with this patch, the value can be
read/written either via netlink or sysfs.

This could be maintained just by the snmp daemon, but it is more
generally useful for other management tools, and the kernel is good
place to act as an agreed upon interface to store it.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

[IPV6]: Add RFC4214 support

2008-01-28T22:55:09+00:00

This patch includes support for the Intra-Site Automatic Tunnel
Addressing Protocol (ISATAP) per RFC4214. It uses the SIT
module, and is configured using extensions to the "iproute2"
utility. The diffs are specific to the Linux 2.6.24-rc2 kernel
distribution.

This version includes the diff for ./include/linux/if.h which was
missing in the v2.4 submission and is needed to make the
patch compile. The patch has been installed, compiled and
tested in a clean 2.6.24-rc2 kernel build area.

Signed-off-by: Fred L. Templin 
Signed-off-by: YOSHIFUJI Hideaki 
Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[CAN]: Allocate protocol numbers for PF_CAN

2008-01-28T22:54:09+00:00

This patch adds a protocol/address family number, ARP hardware type,
ethernet packet type, and a line discipline number for the SocketCAN
implementation.

Signed-off-by: Oliver Hartkopp 
Signed-off-by: Urs Thuermann 
Signed-off-by: David S. Miller

[NET]: Move netlink interface bits to linux/if_link.h.

2006-09-29T01:02:50+00:00

Moving netlink interface bits to linux/if.h is rather troublesome for
applications including both linux/if.h (which was changed to be included
from linux/rtnetlink.h automatically) and net/if.h.

Signed-off-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller

[PATCH] bonding: Validate probe replies in ARP monitor

2006-09-26T00:08:09+00:00

	Add logic to check ARP request / reply packets used for ARP
monitor link integrity checking.

	The current method simply examines the slave device to see if it
has sent and received traffic; this can be fooled by extraneous traffic.
For example, if multiple hosts running bonding are behind a common
switch, the probe traffic from the multiple instances of bonding will
update the tx/rx times on each other's slave devices.

Signed-off-by: Jay Vosburgh 
Signed-off-by: Jeff Garzik

[PATCH] bonding: Add priv_flag to avoid event mishandling

2006-09-26T00:08:09+00:00

Add priv_flag to specifically identify bonding-involved devices.  Needed
because IFF_MASTER is an unreliable identifier (vlan interfaces above bonding
will inherit IFF_MASTER).  Misidentification of devices would cause
notifier events for other devices to be erroneously processed by bonding,
causing various havoc.

Bug discovered by Martin Papik ; this patch is
modified from his original.

Signed-off-by: Martin Papik 
Signed-off-by: Jay Vosburgh 
Signed-off-by: Jeff Garzik

[NET]: Move netlink interface bits to linux/if.h

2006-09-22T21:53:50+00:00

Signed-off-by: Thomas Graf 
Signed-off-by: David S. Miller