Commit Graph

349154 Commits

Author SHA1 Message Date
Paul Gortmaker 0ffd89e48f drivers/net: delete Digital EtherWorks-3 support.
This is another one that makes sense to target for obsolescence, since
it (a)appeared pre-1995, and (b)was rather rare, and (c)did not
really have any statistically significant active linux user base.

Removing this ISA 10Mbit driver support is unlikely to be even noticed
by the user base of 3.9+ linux kernels, especially when the documentation
clearly indicates the vintage with this text:

	 "...designed to  work with all kernels > 1.1.33"

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:55 -05:00
Paul Gortmaker 1f1c7a5c1d drivers/net: delete old DEC depca ISA drivers support.
These are old ISA 10Mbit cards from the 1st 1/2 of the 1990s and
required manual jumper settings in order to configure them.  Here
we remove them on the premise that they are no longer used in any
modern 3.9+ kernels.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:55 -05:00
Paul Gortmaker fce3cd45e6 drivers/net: delete the really obsolete 8390 based 10Mbit ISA drivers
This is an area I know all too well, after being author of several 8390
drivers, and maintainer of all 8390 drivers during a large part of their
active lifecycle.

To that end, I can say this with a reasonable degree of confidence.
The drivers deleted here represent the earliest (as in early 1990)
hardware and/or rare hardware.  The remaining hardware not deleted
here is the more modern/sane of the lot, with ISA-PnP and jumperless
"soft configuration" like the wd and smc cards had.

The original ne2000 driver (ne.c) gets a pass at this time since
AT/LANTIC based cards that could be both ne2000 or wd-like (with
shared memory) and with jumperless configuration were made in the
mid to late 1990's, and performed reasonably well for their era.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:54 -05:00
Paul Gortmaker bb37f1223a drivers/net: delete old fujitsu based eth16i driver
This is another driver for relatively rare 10Mbit hardware that
originated in the early 1990's.  So we select it for removal at
this point in time as well.

Cc: Mika Kuoppala <miku@iki.fi>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:54 -05:00
Paul Gortmaker 13a80cb8b7 drivers/net: delete at1700 ISA 10Mbit driver
These Fujitsu MB86965 based ISA 10Mbit cards were another of the
relatively rare cards dating from the early 1990s that for one reason
or another didn't seem to get a lot of use in linux.  So we retire it
now with a reasonable degree of confidence that it won't impact anyone.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:53 -05:00
Paul Gortmaker d2477de7a6 drivers/net: delete old 8 bit ISA Racal ni5010 support.
These cards were only available in 8bit format, and in addition
they only had AUI and BNC(10-Base2) interfaces (i.e. no RJ-45).

In fact, they are so rare, that an internet search on these old
cards almost comes up empty, unless the "Micom interlan" name
is used.

This puts them in the equivalent domain as the 3c501, so there
should be no strong opposition to the driver removal, as nobody
is seriously using 3.9+ with 8 bit ISA hardware.

In doing so, the whole "ethernet/racal" category becomes empty,
so we clean up the Makefile/Kconfig and subdir appropriately.

Cc: Andreas Mohr <andi@lisas.de>
Cc: Jan-Pascal van Best <janpascal@vanbest.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:52 -05:00
Paul Gortmaker 04861c535d drivers/net: delete Racal Interlan ISA ni52 (i825xx) driver
Like the other drivers that were in the ISA i825xx family, the ni52
was rather rare, not widely used, and hence perhaps not as reliable
as the more mainstream ISA drivers that were heavily used.  Given
that, it is chosen for retirement at this time as well.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:52 -05:00
Paul Gortmaker 8a594170de drivers/net: delete intel i825xx based znet notebook driver
This driver supported early to mid 1990's Zenith laptops, of the
2" thick variety.  The driver was already dead 10+ years ago, but
we see this in the source:

 ----------------
 /* 10/2002

 [...]

   Tested on a vintage Zenith Z-Note 433Lnp+. Probably broken on
   anything else. Testers (and detailed bug reports) are welcome :-).
 ----------------

To clarify, a 433 translates into a 486 at 33MHz, and a system with
a default of 4MB RAM.  I can't fault the noble effort to keep things
working a decade ago, but at this point in time, there is no valid
justification to continue carrying this driver along.

Note that there is no associated Space.c cleanup here since this
driver was using module_init to hook itself in.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:51 -05:00
Paul Gortmaker f84932d831 drivers/net: delete ISA intel eexpress and eepro i825xx drivers
These old drivers should not be confused with the very common PCI
cards that are supported by e100.c -- these older 10Mbit ISA only
drivers were not as commonly used as some of the other ISA drivers,
simply due to hardware availability and pricing.

Given the rarity of the hardware, and the subsequent less extensive
use of the drivers, it makes sense to obsolete them at this point
in time, along with other rare/experimental ISA drivers.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:51 -05:00
Paul Gortmaker 0e245dbaac drivers/net: delete the 3Com 3c505/3c507 intel i825xx support
For those of us who were around in the early to mid 1990's, we
will remember that the i825xx ethernet support was not something
that was considered sufficiently vetted for 24/7 use.

Folks might be inclined to use *functional* ISA hardware on some
near expired P3 ISA machines for dedicated workhorse applications,
but the odds of using (and relying on) one of these old/experimental
drivers is essentially nil.  So lets remove them.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:50 -05:00
Paul Gortmaker 168e06ae26 drivers/net: delete old parallel port de600/de620 drivers
The parallel port is largely replaced by USB, and even in the
day where these drivers were current, the documented speed was
less than 100kB/s.  Let us not pretend that anyone cares about
these drivers anymore, or worse - pretend that anyone is using
them on a modern kernel.

As a side bonus, this is the end of legacy parallel port ethernet,
so we get to drop the whole chunk relating to that in the legacy
Space.c file containing the non-PCI unified probe dispatch.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:49 -05:00
Paul Gortmaker de8270ff46 drivers/net: delete old 8bit ISA 3c501 driver.
It was amusing that linux was able to make use of this 1980's
technology on machines long past its intended lifespan, but
it probably should go now.

To set some context, the 3c501 was designed in the 1980's to be
used on 8088 PC-XT 8bit ISA machines.  It was built using a large
number of discrete TTL components and truly looks like a relic
of the ancient past before large scale integration was common.

But from a functional point of view, the real issue, as stated
in the (also obsolete) Ethernet-HowTo, is that "...the 3c501 can
only do one thing at a time -- while you are removing one packet
from the single-packet buffer it cannot receive another packet,
nor can it receive a packet while loading a transmit packet."

You know things are not good when the Kconfig help text suggests
you make a cron job doing a ping every minute.

Hardware that old and crippled is simply not going to be used by
anyone in a time where 10 year old 100Mbit PCI cards (that are
still functional) are largely give-away items.

Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:49 -05:00
Paul Gortmaker 5205939d0f drivers/net: delete intel 486 panther onboard ethernet support
This driver was specific to a "professional workstation" line
of products from around 1993 that used the i82596 ethernet chip
as an on-board ethernet solution.

With a 486 processor, and the premium top of the line model maxing
out at a clock speed of 50MHz, we can safely retire this support.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:39:48 -05:00
Paul Gortmaker 6e07ba3e6a drivers/net: delete 486 Apricot support
The Apricot was a 486 PC with 4MB RAM, and an on-board ethernet
via an intel i82596 hard-wired to i/o 0x300.

Those who were using linux in the 1990's will recall that the
i82596 driver was not one of the more stable or widely used
drivers of its day.  Combine that with the extremely limited
resources of the platform, and it is truly time to expire the
support for this thing.

There are some old m68k targets who were also using this chip,
so rather than poll the m68k user base, we simply cut out the
x86/Apricot support here in this commit.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-01-22 10:32:35 -05:00
Tilman Schmidt 63b203b43b isdn/gigaset: beautify ev-layer.c
Cosmetic changes to drivers/isdn/gigaset/ev-layer.c and
drivers/isdn/gigaset/gigaset.h to improve readability.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 17:36:26 -05:00
Tilman Schmidt bc882b1880 isdn/gigaset: beautify common.c
Rearrange the gigaset_freecs() function to make it more readable,
and adapt gigaset_initcs() accordingly.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 17:36:25 -05:00
Tilman Schmidt cdc4827098 isdn/gigaset: beautify interface.c
Avoid forward declarations and remove a needless initialization.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 17:36:25 -05:00
Tilman Schmidt d2ca848194 isdn/gigaset: leave DLE mode before hanging up
Some firmware releases of Gigaset M105 do not accept AT+VLS=0 command
in DLE mode, so always leave DLE mode before sending the command.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 17:36:25 -05:00
Tilman Schmidt 03f18285cd isdn/divert: fix readability damage
Fix up some of the readibility deterioration caused by last year's
ISDN whitespace coding style cleanup.
Note that the checkpatch complaints all apply to the state of the
source before this patch as well, and in many cases even more so.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 17:36:25 -05:00
Julia Lawall 56567c6f87 drivers/net/ethernet/sfc/ptp.c: adjust duplicate test
Delete successive tests to the same location.  rc was previously tested and
not subsequently updated.  efx_phc_adjtime can return an error code, so the
call is updated so that is tested instead.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@s exists@
local idexpression y;
expression x,e;
@@

*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\)
    when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 15:44:58 -05:00
YOSHIFUJI Hideaki / 吉藤英明 b820bb6b99 ndisc: Do not try to update "updated" time if neighbour has already gone.
Commit 2152caea ("ipv6: Do not depend on rt->n in rt6_probe().")
introduce a bug to try to update "updated" time in neighbour
structure.
Update the "updated" time only if neighbour is available.

Bug was found by Dan Carpenter <dan.carpenter@oracle.com>

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 15:41:41 -05:00
David S. Miller 100204147b Merge branch 'dsa'
Florian Fainelli says:

====================
These two patches are non-critical bugfixes based on net-next which I
stumbled upon while working on Device Tree bindings for DSA (will comme
as a separate patch later).

====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 15:40:47 -05:00
Florian Fainelli f9bf5a2ca6 dsa: make dsa_switch_setup check for valid port names
This patch changes dsa_switch_setup() to ensure that at least one valid
valid port name is specified and will bail out with an error in case we
walked the maximum number of port with a valid port name found.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 15:40:12 -05:00
Florian Fainelli f490be049b dsa: use an unique and non conflicting bus name for the slave MII bus
The slave MII bus registered by the DSA code is using the parent MII bus
as part of its name (ds->master_mii_bus_id), in case the parent MII bus
name is already 16 characters long (such as d0072004.mdio-mi) we will
get the following WARN_ON in dsa_switch_setup() when calling
mdiobus_register():

[   79.088782] ------------[ cut here ]------------
[   79.093448] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0x80/0xa0()
[   79.099831] sysfs: cannot create duplicate filename
'/class/mdio_bus/d0072004.mdio-mi'

This is a genuine warning, because the DSA slave MII bus will also be
named d0072004.mdio-mi, and since MII_BUS_ID_SIZE is 17 characters long
(with null-terminator) the following will truncate the slave MII bus id:

snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s-%d:%.2x",
                        ds->master_mii_bus->id, ds->pd->sw_addr);

Fix this by using dsa-<switch index->:<sw_add> which is guaranteed to be
unique.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 15:40:11 -05:00
Cong Wang 441d9d327f net: move rx and tx hash functions to net/core/flow_dissector.c
__skb_tx_hash() and __skb_get_rxhash() are all for calculating hash
value based by some fields in skb, mostly used for selecting queues
by device drivers.

Meanwhile, net/core/dev.c is bloating.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:26:17 -05:00
David S. Miller cd5f20461d Merge branch 'virtio_mac'
Amos Kong says:

====================
Currenly mac is programmed byte by byte. This means that we
have an intermediate step where mac is wrong.

Third patch introduced a new vq control command to set mac
address, it's atomic.

V2: check return of sending command, delay eth_mac_addr()
V3: restore software address when fail to set hardware address
V4: split eth_mac_addr, fix error handle
V5: rebase patches to net-next tree
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:14:09 -05:00
Amos Kong 7e58d5aea8 virtio-net: introduce a new control to set macaddr
Currently we write MAC address to pci config space byte by byte,
this means that we have an intermediate step where mac is wrong.
This patch introduced a new control command to set MAC address,
it's atomic.

VIRTIO_NET_F_CTRL_MAC_ADDR is a new feature bit for compatibility.

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:07:44 -05:00
Stefan Hajnoczi fa0879e37b net: split eth_mac_addr for better error handling
When we set mac address, software mac address in system and hardware mac
address all need to be updated. Current eth_mac_addr() doesn't allow
callers to implement error handling nicely.

This patch split eth_mac_addr() to prepare part and real commit part,
then we can prepare first, and try to change hardware address, then do
the real commit if hardware address is set successfully.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:07:44 -05:00
Amos Kong 40cbfc3707 move virtnet_send_command() above virtnet_set_mac_address()
We want to send vq command to set mac address in
virtnet_set_mac_address(), so do this function moving.
Fixed a little issue of coding style.

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:07:43 -05:00
David S. Miller 3fcd550a4b Merge branch 'mcast'
Nicolas Dichtel says:

====================
The goal of this serie is to add the support of proxy multicast, ie being able
to build a static multicast tree. In other words, it adds the support of (*,G)
mf[6]c entries.

v2: use INADDR_ANY instead of 0 for IPv4 addresses
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 14:06:34 -05:00
Nicolas Dichtel 660b26dc1a mcast: add multicast proxy support (IPv4 and IPv6)
This patch add the support of proxy multicast, ie being able to build a static
multicast tree. It adds the support of (*,*) and (*,G) entries.

The user should define an (*,*) entry which is not used for real forwarding.
This entry defines the upstream in iif and contains all interfaces from the
static tree in its oifs. It will be used to forward packet upstream when they
come from an interface belonging to the static tree.
Hence, the user should define (*,G) entries to build its static tree. Note that
upstream interface must be part of oifs: packets are sent to all oifs
interfaces except the input interface. This ensures to always join the whole
static tree, even if the packet is not coming from the upstream interface.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:55:14 -05:00
Nicolas Dichtel bbb923a4c2 mcast: define and use MRT[6]_MAX in ip[6]_mroute_opt()
This will ease further addition of new MRT[6]_* values and avoid to update
in6.h each time.
Note that we reduce the maximum value from 210 to 209, but 210 does not match
any known value in ip[6]_mroute_setsockopt().

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:55:14 -05:00
Paul Gortmaker 202dc3fc59 Documentation: remove obsolete networking/multicast.txt file
The original intent of this file was to list limitations in
drivers/hardware relating to multicast use, back when some
modest hardware from the early 1990s did not support things
we might take for granted today.

I was intending to delete some now-gone MCA/token ring entries
in this file, but once I opened it, I found it only contained
information on the earliest (pre-2000) linux networking drivers.

Checking the git history shows that the file hasn't been touched
since 2005.  Clearly nobody is actively consulting this file
as a meaningful reference.

Rather than add a "YES YES YES" line for all of the drivers we
currently have, lets just take advantage of the fact that nobody
is using the file to delete it.

This has the side benefit of not having to do a line-by-line
deletion of the file content as each older driver is expired.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:54:05 -05:00
David S. Miller 12dfac6c95 Merge branch 'qeth'
Merge s390 networking changes from Frank Blaschka.

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:24 -05:00
Stefan Raspl 0fa81cd49d qeth: Fix HiperSockets performance regression
Commit 46d3ceab "tcp: TCP Small Queues" has severly degraded
performance for single connection RR workloads on HiperSockets with
MTU >=16K due to a conflict of the TCP Small Queues approach with our
buffer scan threshold which releases buffers not frequently enough yet.
This fix restores performance to the same level as before cited commit.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:15 -05:00
Stefan Raspl 819dc537fd qeth: Make s390dbf card entries persistent
As of now, s390dbf entries for the cards are discarded as soon as the
device is removed. However, this will also bar us of all chances of
getting valuable debug information after a device has been removed.
This patch will keep the s390dbf entries around until the qeth module
is removed.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:15 -05:00
Stefan Raspl 26e4b3340e qeth: Update Kconfig wording
Refer to virtual NICs instead of GuestLANs.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:15 -05:00
Stefan Raspl 0f54761d16 qeth: Support VEPA mode
The existing port isolation mode 'forward' will now verify that the adjacent
switch port supports the required reflective relay (RR) mode. This patch adds
the required error handling for the cases where enabling port isolation mode
'forward' can now fail.
Furthermore, once established, we never fall back from one of the port
isolation modes to a non-isolated mode without further user-interaction.
This includes cases where the isolation mode was enabled successfully, but
ceases to work e.g. due to configuration changes at the switch port.
Finally, configuring an isolation mode with the device being offline
will make onlining the device fail permanently upon errors encountered until
either errors are resolved or the isolation mode is changed by the user to a
different mode.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:14 -05:00
Stefan Raspl eb3fb0baa2 qeth: Remove unused exports
Remove exports that are not used anywhere else.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:14 -05:00
Stefan Raspl 6ebb7f8d79 qeth: Fix retry logic in hardsetup
The previous code did never retry any idx setup unless retries were done
for device offline/online at the beginning of the function.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:51:14 -05:00
David S. Miller 9acefd17cb Merge branch 'ipv6_ndisc'
YOSHIFUJI Hideaki says:

====================
This series of changes basically clean up NDISC logic,
especially on sender side.

We originally do For NS/NA/RS:
 1) build temporary ICMPv6 header
 2) ndisc_build_skb() with temporary ICMPv6 header and rather
    criptic arguments.
    - Calculate total length and allocate sk_buff
    - Build IPv6 header.
    - copy ICMPv6 header, additional data and ND options.
    - Fill-in ICMPv6 checksum.
    Here, structures defined for message format was not used
    at all, it is difficult to understand what is being sent,
    and it was not generic.
 3) __ndisc_send()
    - Allocate temporary dst.
    - Send it.

Several issues:
- We could not defer decision if we should/can send some ND
  option.
- It is hard to see the packet format at a glance.
- ICMPv6 header was built as temporary variable, and then
  copied to the buffer.
- Some code path for Redirect was not shared.

With these patches, we do:
 1) Calculate (or estimate) message length and option length.
 2) Allocate skb (via new ndisc_skb_alloc()).
 3) Fill-in ICMPv6 message directly using compound literals.
 4) Fill-in ICMPv6 checksum
 5) Build IPv6 header (including length)
 6) Send the packet (via ndisc_send_skb()).
    - allocate temporary dst and send it.

- We can defer calculating real length of the packet.
  For example, we can give up filling some option at when
  filling in.
- Message is built directly without temporary buffer.
- Structures defined for message format is easier to understand
  what is being built.
- NS/NA/RS/Redirect share same logic.
- Reduced code/data size:
	   text	   data	    bss	    dec	    hex	filename
	 265407	  14133	   3488	 283028	  45194	old/net/ipv6/ipv6.o
	 264955	  14109	   3488	 282552	  44fb8	new/net/ipv6/ipv6.o
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:50:10 -05:00
YOSHIFUJI Hideaki / 吉藤英明 4d5c152e86 ndisc: Use compound literals to build redirect message.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:18 -05:00
YOSHIFUJI Hideaki / 吉藤英明 1cb3fe513f ndisc: Break down ndisc_build_skb() and build message directly.
Construct NS/NA/RS message directly using C99 compound literals.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:18 -05:00
YOSHIFUJI Hideaki / 吉藤英明 b44b5f4ae9 ndisc: Break down __ndisc_send().
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:17 -05:00
YOSHIFUJI Hideaki / 吉藤英明 7b3d9b06d8 ndisc: Fill in ICMPv6 checksum and IPv6 header in ndisc_send_skb().
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:17 -05:00
YOSHIFUJI Hideaki / 吉藤英明 f4de84c64e ndisc: Use ndisc_send_skb() for redirect.
Reuse dst if one is attached with skb.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:17 -05:00
YOSHIFUJI Hideaki / 吉藤英明 aa4bdd4b3f ndisc: Remove icmp6h argument from ndisc_send_skb().
skb_transport_header() (thus icmp6_hdr()) is available here,
use it.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:17 -05:00
YOSHIFUJI Hideaki / 吉藤英明 5f5a011563 ndisc: Make ndisc_fill_xxx_option() for sk_buff.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:16 -05:00
YOSHIFUJI Hideaki / 吉藤英明 2ce1357614 ndisc: Calculate message body length and option length separately.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:16 -05:00
YOSHIFUJI Hideaki / 吉藤英明 5135e633f9 ndisc: Reset skb->trasport_headner inside ndisc_alloc_send_skb().
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-21 13:33:16 -05:00