Support for FQ packet scheduler

$ tc qd add dev eth0 root fq help
Usage: ... fq [ limit PACKETS ] [ flow_limit PACKETS ]
              [ quantum BYTES ] [ initial_quantum BYTES ]
              [ maxrate RATE  ] [ buckets NUMBER ]
              [ [no]pacing ]

$ tc -s -d qd
qdisc fq 8002: dev eth0 root refcnt 32 limit 10000p flow_limit 100p
buckets 256 quantum 3028 initial_quantum 15140
 Sent 216532416 bytes 148395 pkt (dropped 0, overlimits 0 requeues 14)
 backlog 0b 0p requeues 14
  511 flows (511 inactive, 0 throttled)
  110 gc, 0 highprio, 0 retrans, 1143 throttled, 0 flows_plimit

limit	: max number of packets on whole Qdisc (default 10000)

flow_limit : max number of packets per flow (default 100)

quantum : the max deficit per RR round (default is 2 MTU)

initial_quantum : initial credit for new flows (default is 10 MTU)

maxrate : max per flow rate (default : unlimited)

buckets : number of RB trees (default : 1024) in hash table.
               (consumes 8 bytes per bucket)

[no]pacing : disable/enable pacing (default is enable)

Usage :

tc qdisc add dev $ETH root fq

tc qdisc del dev $ETH root 2>/dev/null
tc qdisc add dev $ETH root handle 1: mq
for i in `seq 1 4`
do
  tc qdisc add dev $ETH parent 1:$i est 1sec 4sec fq
done
Signed-off-by: Eric Dumazet <edumazet@google.com>

This iproute2 tc patch is connected to the kernel
 - commit 8a8e3d84b17 (net_sched: restore "linklayer atm" handling)

The rate table calculated by tc, have gotten replaced in the kernel
and is no-longer used for lookups.

This happened in kernel release v3.8 caused by kernel
 - commit 56b765b79 ("htb: improved accuracy at high rates").
This change unfortunately caused breakage of tc overhead and
linklayer parameters.

 Kernel overhead handling got fixed in kernel v3.10 by
 - commit 01cb71d2d47 (net_sched: restore "overhead xxx" handling)

 Kernel linklayer handling got fixed in kernel v3.11 by
 - commit 8a8e3d84b17 (net_sched: restore "linklayer atm" handling)

The linklayer fix introduced a struct change, that allow the linklayer
attribute to be transferred between tc and kernel. This patch make use
of this linklayer attribute.

The linklayer setting is transfer to the kernel.  And linklayer
setting received from the kernel is printed with a prefixed
"linklayer" when listing current configuration.  The default
TC_LINKLAYER_ETHERNET is only printed in detailed output mode.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

Since commit a05f6511, ip batch mode is broken when using 'netns exec' cmd.

When WIFEXITED() returns true, it means that the child exited normally, hence
we must not call exit() but just returns the status. If we call exit, the next
commands in the file file are not executed.
If WIFEXITED() returns false, we can call exit() because it means that the
child failed.

This patch partially reverts commit a05f6511.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Last minute addition to pkt_sched.h

The git-commit dc8867d0, that added support for displaying the
extra-flags of a state, introduced a potential segfault.
Trying to show a state without the extra-flag attribute and show_stats
enabled, would cause the NULL pointer in tb[XFRMA_SA_EXTRA_FLAGS] to be
dereferenced.
Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>

The mode information is contained in IFLA_MACVLAN_MODE instead
of IFLA_VLAN_ID (both evaluating to "1" in their enums).
Signed-off-by: Lutz Jaenicke <ljaenicke@innominate.com>

In SYNOPSIS section:

 - Add 'reordering'
 - Add missing '[' before 'quickack'
Signed-off-by: Richard Godbee <richard@godbee.net>

Signed-off-by: Richard Godbee <richard@godbee.net>

Fix two spacing problems around square brackets in usage text.
Signed-off-by: Richard Godbee <richard@godbee.net>

Useful to be able to monitor arp and IPv6 nd seperately.
Default is both.

Pfifo_fast needs no options. So don't force it to have parsing code.

Prefix labelling is currently only activated when monitoring "all"
objects.  However, the output can still be confusing when monitoring
more than 1 object, so add an option to always print prefix labels.
Signed-off-by: Martin Schwenke <martin@meltin.net>

Minor errors found by codespell

Split it naturally

Add support for the bridge fdb replace command to replace an
existing entry in the vxlan device driver forwarding data base.
The entry is identified with its unicast mac address and its
corresponding remote destination information is updated.

This is useful for virtual machine migration and replaces the
bridge fdb del and bridge fdb add commands.

It follows the same interface as ip neigh replace commands.
Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>

When configuring a system with multiple network uplinks and default routes, it
is often convenient to reference a routing table multiple times - but reject
its routing decision if certain constraints are not met by it.

Consider this setup:

$ ip route add table secuplink default via 10.42.23.1

$ ip rule add pref 100            table main suppress_prefixlength 0
$ ip rule add pref 150 fwmark 0xA table secuplink

With this setup, packets marked 0xA will be processed by the additional routing
table "secuplink", but only if no suitable route in the main routing table can
be found. By suppressing entries with a prefixlength of 0 (or less), the
default route (/0) of the table "main" is hidden to packets processed by rule
100; packets traveling to destinations via more specific routes are processed
as usual.

It is also possible to suppress a routing entry if a device belonging to
a specific interface group is to be used:

$ ip rule add pref 150 table main suppress_group 1
Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>

This change adds the interface group to the output of "ip link show".

It also makes "ip link" print _all_ devices if no group filter is specified;
previously, only interfaces of the default group (0) were shown.
Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>

-Werror just doesn't work because it changes too much
between compiler versions.

It's now possible to have IPv4 and IPv6 over IPv4 tunnels with the module sit.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Because only IPv4 was supported, the size was static. Now, IPv6 also supports
peer address.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

This patch allows setting VXLAN destination to unicast address.
It allows that VXLAN can be used as peer-to-peer tunnel without
multicast.

v6: change back to the v3 except for using new attribute because
    replacing command-line parameters breaks existing scripts,
    based by Cong Wang's comments.

v5: rebase on the latest.

v4: replace "group" with "remote" based by David Stevens's comments.

v3: move a new attribute REMOTE into the last of an enum list
    based by Stephen Hemminger's comments.
    fix the usage to show explicitly that both "remote" and "group"
    cannot be specified, based by Ben Hutchings's comments.

v2: use a new argument "remote" instead of "group" based by
    Stephen Hemminger's comments.
Signed-off-by: Atzm Watanabe <atzm@stratosphere.co.jp>

Sanitized headers from upstream

Change the code for tc and ip so that batch mode is handled
the same.

The netns code was using EXIT_SUCCESS/EXIT_FAILURE but the rest of the ip
code used -1 explictly, so change to follow convention. Also, certain types
of errors like fork failure should abort a batch operation, rather than just
returning an error.

These do nothing on an 80-column display. They were clearly somebody's
boilerplate way of setting up hanging indents, but the syntax lines
are way too short to require them. And since most were argumentless
they would have been no-ops on any sized display.

The ip link command line help and the ip-link.8.in
man page are outdated in regards to the vxlan support.
The patch updates both the command line help for the
ip command and its man page.
Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>

The bridge fdb command line help and the bridge.8
man page are outdated in regards to the vxlan support.
The patch updates both the command line help for the
bridge command and its man page.
Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>

execvp() does not return when the command succeed, hence all commands in the
batch file after the line 'ip netns exec' are not executed.

Let's fork before calling execvp() if batch mode is used..

Example:
$ cat test.batch
netns add netns1
netns exec netns1 ip l
netns
$ ip -b test.batch
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: sit0: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT
    link/sit 0.0.0.0 brd 0.0.0.0

All command after 'netns exec' are never executed.

With the patch:
$ ip -b test.batch
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: sit0: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT
    link/sit 0.0.0.0 brd 0.0.0.0
netns1

Now, existing netns are displayed.
Signed-off-by: JunweiZhang <junwei.zhang@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Without patch, I got:

	# ./ip/ip tunnel show
	ip_vti0: ioctl 89f4 failed: Invalid argument
	ip_vti0: ip/ip  remote any  local any  ttl inherit  nopmtudisc key 0

this is due to VTI_ISVTI has the same numeric value with SIT_ISATAP,
but only sit tunnel has SIOCGETPRL, therefore it should check for SIT
tunnel first.

Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Cong Wang <amwang@redhat.com>

The command synopsis is regularized and part of it split off into an
OPTIONS section.  This allows the page to lift to XML-DocBook.

An invalid \p escape was removed.

This page was written by someone who didn't understand the use of
definite and indefinite articles in English, nor its punctuation rules.
I've fixed these mistakes, and some glitches in punctuation and
capitalization.