This patch adds a short documentation snippet about the mailbox organization as
it's regularly not correct in freescale's datasheets.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Flexcan V10 and newer are able to receive RTR frames in a MB. Older versions
are not. Those should use flexcan in FIFO mode.
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

In our department we are using some older Janz ICAN3-modules in our dekstop
pcs. There we have slightly different carrier boards than the janz-cmodio
supported in the kernel sources, called CAN-PCI2 with two submodules. But the
pci configuration regions are identical. So extending the supported pci devices
to the corresponding device ids is sufficient to get the drivers working.

* The old ICAN3-modules with firmware 1.28 need more then 250ms for the restart
  after reset. I've increased the timeout to 500ms.
* The janz_ican3 module uses the raw can services of the Janz-firmware, this
  means firmware must be ICANOS/2. Our ICAN3-modules are equipped with
  CAL/CANopen-firmware, so I must use the appropriate commands for the layer
  management services.

Te driver detects the firmware after module reset and selects the commands
matching the firmware. This affects the bus on/off-command
(ican3_set_bus_state) and the configuration of the bittiming
(ican3_set_bittiming). For better diagnostics the detected firmware string is
presented as sysfs attribute (fwinfo).
Signed-off-by: Andreas Gröger <andreas24groeger@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

This patch adds documentation for the existing sysfs entries for the janz PCI
module.
Signed-off-by: Andreas Gröger <andreas24groeger@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The current definition of struct can_frame has a 16-byte size, with 8-byte
alignment, but the 3 bytes of padding are not explicit like the similar 2 bytes
of padding of struct canfd_frame. Make it explicit so it is easier to read.
Signed-off-by: Shawn Landden <shawn@churchofgit.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

VXLAN must provide the skb mark and specifiy IPPROTO_UDP when doing
the FIB lookup for the remote ip. Otherwise an invalid route might
be returned.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch remove kernel-doc warnings.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Synchronize names with other drivers.
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use of_property_* calls
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

use devm_* calls
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Synchronize names with other drivers
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is rule for network drivers with comments blocks
which is newly checked by checkpatch.pl script.
Let's fix it.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Removed checkpatch.pl errors and warnings.
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch adds proper checks to handle the PHY-less case.
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In the current implementation, jumbo frames are supported only
for the frame sizes > 16K. This patch corrects this logic to
handle jumbo frames for lesser frame sizes (< 16K) ensuring jumbo frame
MTU is within the limit of max frame size configured in the h/w
design.
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The packet completion interrupts for TX and RX should be serviced before
the packets are consumed. This ensures against the degenerate case when a
new completion interrupt is raised after the handler has exited but before
the interrupts are cleared. In this case its possible for the ISR to clear
an unhandled interrupt (leading to potential deadlock).
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Tested-by: Jason Wu <huanyu@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The AXI-DMA rx-delay interrupt can sometimes be triggered
when there are 0 outstanding packets received. This is due
to the fact that the receive function will greedily consume
as many packets as possible on interrupt. So if two packets
(with a very particular timing) arrive in succession they
will each cause the rx-delay interrupt, but the first interrupt
will consume both packets.
This means the second interrupt is a 0 packet receive.

This is mostly OK, except that the tail pointer register is
updated unconditionally on receive. Currently the tail pointer
is always set to the current bd-ring descriptor under
the assumption that the hardware has moved onto the next
descriptor. What this means for length 0 recv is the current
descriptor that the hardware is potentially yet to use will
be marked as the tail. This causes the hardware to think
its run out of descriptors deadlocking the whole rx path.

Fixed by updating the tail pointer to the most recent
successfully consumed descriptor.
Reported-by: Wendy Liang <wendy.liang@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Tested-by: Jason Wu <huanyu@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch adds support for the RGMII. The h/w configuration
parameter C_PHY_TYPE, which represents the interface configured in
the design, is used to differentiate various interfaces supported
by AXI Ethernet.
Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Hariprasad Shenai says:

====================
Trivial fixes and changes for SGE

This patch series adds the following.
Discard packet if length is greater than MTU, move sge monitor code to a
new routine, add device node to ULD info, add congestion notification from
SGE for ingress queue and freelists and for T5, setting up the Congestion
Manager values of the new RX Ethernet Queue is done by firmware now.

This patch series has been created against net-next tree and includes
patches on cxgb4 driver.

We have included all the maintainers of respective drivers. Kindly review
the change and let us know in case of any review comments.

Thanks

V2: Align parenthesis for PATCH 2/6 and PATCH 5/6
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

pktgen sends raw udp packets and bypasses most of the
linux networking stack. User can specify different packet sizes.
Hence we need to discard the packet if the length is greater than mtu
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds device node to ULD info. Use the node info to alloc_ring() for ctrl
TX queues
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Passes a Congestion Channel Map to t4_sge_alloc_rxq()
for the Ethernet RX Queues based on the MPS Buffer Group Map
of the TX Channel rather than just the TX Channel Map.
Also, in t4_sge_alloc_rxq() for T5, setting up the
Congestion Manager values of the new RX Ethernet Queue is
done by firmware now.
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Also changed the name of t4_hw.c:get_mps_bg_map() to t4_get_mps_bg_map()
and make it an exported routine with a definition in cxgb4.h.
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We need to make sure that the Free List Size, in pointers, is at
least 2 Egress Queue Units (8 pointers/each) larger than the SGE's Egress
Congestion Threshold (in pointers).
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A 64bit division went in unnoticed. Use do_div() to accomodate
non 64bit architectures.

Reported-by: kbuild test robot
Fixes: 1aa661f5 ("rhashtable-test: Measure time to insert, remove & traverse entries")
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove useless obj variable and goto logic.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

Mahesh Bandewar says:

====================
Multicast processing in IPvlan

Dan Willems pointed out that autoconf in IPvlan is broken because of the
way broadcast bit gets set. Since broadcast processing is a real performance
drain, the broadcast bit in multicast filter was only set when the interface
was configured with IPv4 address. In autoconf scenario, when there are
no addresses configured; this logic did not work and it wouldn't allow
DHCPv4 to work. The only way was to add protocol specific hacks to avoid
processing unnecessary broadcast burdon.

This jugglery could be avoided if these multicast / broadcast packets are taken
out of fast-path and are processed in a work-queue. This will enable us to add
broadcast bit in all multicast filters without any impact on performance of
the virtual device. This patch series just does that.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Earlier tricks of setting broadcast bit only when IPv4 address is added
onto interface are not good enough especially when autoconf comes in play.
Setting them on always is performance drag but now that multicast /
broadcast is not processed in fast-path; enabling broadcast will let
autoconf work correctly without affecting performance characteristics of
the device.
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Processing multicast / broadcast in fast path is performance draining
and having more links means more cloning and bringing performance
down further.

Broadcast; in particular, need to be given to all the virtual links.
Earlier tricks of enabling broadcast bit for IPv4 only interfaces are not
really working since it fails autoconf. Which means enabling broadcast
for all the links if protocol specific hacks do not have to be added into
the driver.

This patch defers all (incoming as well as outgoing) multicast traffic to
a work-queue leaving only the unicast traffic in the fast-path. Now if we
need to apply any additional tricks to further reduce the impact of this
(multicast / broadcast) type of traffic, it can be implemented while
processing this work without affecting the fast-path.
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alexander Duyck says:

====================
Add eth_proto_is_802_3 to provide improved means of checking Ethertype

This patch series implements and makes use of eth_proto_is_802_3().  The
idea behind the function is to provide an optimized means of testing to
determine if a given Ethertype value is a length or 802.3 protocol number.
The standard path for this was to use ntohs(proto) and then perform a
comparison.  This adds a slight cost as it usually requires either a 16b
rotate or byte swap which can cost 1 cycle or more depending on the
processor.

I had previously addressed this for eth_type_trans, however in doing so I had
overlooked checking with sparse and had introduced a couple sparse warnings.
The first patch in this series fixes those sparse warnings as well as does
some additional optimization for big endian systems.  In addition it pushes
the code out into a separate function which can then be used in the other
patches to reduce the instruction count/processing time in those functions
as well.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace "ntohs(proto) >= ETH_P_802_3_MIN" w/ eth_proto_is_802_3(proto).
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace "ntohs(proto) >= ETH_P_802_3_MIN" w/ eth_proto_is_802_3(proto).
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace "ntohs(proto) >= ETH_P_802_3_MIN" w/ eth_proto_is_802_3(proto).
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace "ntohs(proto) >= ETH_P_802_3_MIN" w/ eth_proto_is_802_3(proto).
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This change does two things.  First it fixes a sparse error for the fact
that the __be16 degrades to an integer.  Since that is actually what I am
kind of doing I am simply working around that by forcing both sides of the
comparison to u16.

Also I realized on some compilers I was generating another instruction for
big endian systems such as PowerPC since it was masking the value before
doing the comparison.  So to resolve that I have simply pulled the mask out
and wrapped it in an #ifndef __BIG_ENDIAN.

Lastly I pulled this all out into its own function.  I notices there are
similar checks in a number of other places so this function can be reused
there to help reduce overhead in these paths as well.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

BR_GROUPFWD_RESTRICTED bitmask restricts users from setting values to
/sys/class/net/brX/bridge/group_fwd_mask that allow forwarding of
some IEEE 802.1D Table 7-10 Reserved addresses:

	(MAC Control) 802.3		01-80-C2-00-00-01
	(Link Aggregation) 802.3	01-80-C2-00-00-02
	802.1AB LLDP			01-80-C2-00-00-0E

Change BR_GROUPFWD_RESTRICTED to allow to forward LLDP frames and document
group_fwd_mask.

e.g.
   echo 16384 > /sys/class/net/brX/bridge/group_fwd_mask
allows to forward LLDP frames.

This may be needed for bridge setups used for network troubleshooting or
any other scenario where forwarding of LLDP frames is desired (e.g. bridge
connecting a virtual machine to real switch transmitting LLDP frames that
virtual machine needs to receive).

Tested on a simple bridge setup with two interfaces and host transmitting
LLDP frames on one side of this bridge (used lldpd). Setting group_fwd_mask
as described above lets LLDP frames traverse bridge.
Signed-off-by: Bernhard Thaler <bernhard.thaler@wvnet.at>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch allows a server application to get the TCP SYN headers for
its passive connections.  This is useful if the server is doing
fingerprinting of clients based on SYN packet contents.

Two socket options are added: TCP_SAVE_SYN and TCP_SAVED_SYN.

The first is used on a socket to enable saving the SYN headers
for child connections. This can be set before or after the listen()
call.

The latter is used to retrieve the SYN headers for passive connections,
if the parent listener has enabled TCP_SAVE_SYN.

TCP_SAVED_SYN is read once, it frees the saved SYN headers.

The data returned in TCP_SAVED_SYN are network (IPv4/IPv6) and TCP
headers.

Original patch was written by Tom Herbert, I changed it to not hold
a full skb (and associated dst and conntracking reference).

We have used such patch for about 3 years at Google.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Tested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

> net/core/skbuff.c:4108:13: sparse: incorrect type in assignment (different base types)
> net/ipv6/mcast_snoop.c:63 ipv6_mc_check_exthdrs() warn: unsigned 'offset' is never less than zero.

Introduced by 9afd85c9
("net: Export IGMP/MLD message validation code")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jeff Kirsher says:

====================
Intel Wired LAN Driver Updates 2015-05-04

This series contains updates to igb, e100, e1000e and ixgbe.

Todd cleans up igb_enable_mas() since it should only be called for the
82575 silicon and has no clear return, so modify the function to void.

Jean Sacren found upon inspection that 'err' did not need to be
initialized, since it is immediately overwritten.

Alex Duyck provides two patches for e1000e, the first cleans up the
handling VLAN_HLEN as a part of max frame size.  Fixes the issue:
c751a3d5 ("e1000e: Correctly include VLAN_HLEN when changing
interface MTU").  The second fixes an issue where the driver was not
allowing jumbo frames to be enabled when CRC stripping was disabled,
however it was allowing CRC stripping to be disabled while jumbo frames
were enabled.

Jeff (me) fixes a warning found on PPC where the use of do_div() needed
to use u64 arg and not s64.

Mark provides three ixgbe patches, first to fix the Intel On-chip System
Fabric (IOSF) Sideband message interfaces, to serialize access using both
PHY bits in the SWFW_SEMAPHORE register.  Then fixes how semaphore bits
were released, since they should be released in reverse of the order that
they were taken.  Lastly updates ixgbe to use a signed type to hold
error codes, since error codes are negative, so consistently use signed
types when handling them.

v2: dropped the previous #6-#8 patches by Hiroshi Shimanoto based on
    feedback from Or Gerlitz (and David Miller) that it appears there
    needs to be further discussion on how this gets implemented.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>