Commit Graph

455741 Commits

Author SHA1 Message Date
hayeswang
b8125404c2 r8152: increase the tx timeout
When the system is too busy to complete the urb, the tx timout function
would be called. This causes the other tx urbs would be killed, too.
Increase the tx timeout to avoid it.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-08 11:31:45 -07:00
Fabian Frederick
4f6ad60cf3 ipconfig: add static to local variable
ic_dev_xid is only used in ipconfig.c

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: netdev@vger.kernel.org
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-08 11:30:33 -07:00
David S. Miller
52d14c6661 Merge branch 'amd-xgbe-next'
Tom Lendacky says:

====================
amd-xgbe: AMD 10Gb Ethernet driver updates

The following series fixes some bugs and provides new/changed support
in the driver.

- Fix a debugfs backward compatibility issue introduced by a previous patch
- Write to the interrupt enablement register, not the status register when
  setting MTL interrupts
- Call netif_napi_del whenever the ndo_stop operation is called (to match
  the call to netif_napi_add on ndo_open)
- Peformance enhancements:
  - Adjusted default coalescing settings
  - AXI DMA changes (burst length size and cache settings)
  - ioread/iowrite reduction during interrupt
  - Napi poll updates
- AXI DMA settings based on device tree property to account for a change in
  the ARM64 default cache operations assignment

This patch series is based on net-next.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:15 -07:00
Lendacky, Thomas
cfa50c7811 amd-xgbe: Base AXI DMA cache settings on device tree
The default cache operations for ARM64 were changed during 3.15.
To use coherent operations a "dma-coherent" device tree property
is required.  If that property is not present in the device tree
node then the non-coherent operations are assigned for the device.

Add support to the amd-xgbe driver to assign the AXI DMA cache settings
based on whether the "dma-coherent" property is present in the device
node.  If present, use settings that work with the caches.  If not
present, use settings that do not look at the caches.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:06 -07:00
Lendacky, Thomas
9867e8fb2c amd-xgbe: Performance enhancements
This patch provides some general performance enhancements for the
driver:
  - Modify the default coalescing settings (reduce usec, increase frames)
  - Change the AXI burst length to 256 bytes (default was 16 bytes which
    was smaller than a cache line)
  - Change the AXI cache settings to write-back/write-allocate which
    allocate cache entries for received packets during the DMA since the
    packet will be processed soon afterwards
  - Combine ioread/iowrite when disabling both the Tx and Rx interrupts
  - Change to processing the Tx/Rx channels in pairs
  - Only recycle the Rx descriptors when a threshold of dirty descriptors
    is reached

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:06 -07:00
Lendacky, Thomas
ff42606eed amd-xgbe: Call netif_napi_del on ndo_stop operation
Currently the napi context is added using netif_napi_add each time
the ndo_open operation is called.  However, there is not a
corresponding netif_napi_del call during the ndo_stop operation. If
the device ndo_open operation was called more than once an infinite
loop occurs during module unload.  Add a call to netif_napi_del during
the ndo_stop operation.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:06 -07:00
Lendacky, Thomas
91f873453b amd-xgbe: Clear the proper MTL interrupt register
When initializing the MTL interrupts the interrupt status
register is written to instead of the interrupt enable register.
Since no MTL interrupts are being enabled and the default state
is for MTL interrupts to be disabled this did not cause a problem,
but needs to be fixed to target the correct register.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:06 -07:00
Lendacky, Thomas
f3f128d40c amd-xgbe: Fix debugfs compatibility change with kstrtouint
The initial change from sscanf to kstrtouint broke backward
compatbility by using a base of "0" in the kstrtouint call.
This allowed for entering decimal, hexadecimal or octal as
input where previously the sscanf always interpreted the input
as hexadecimal.  Additionally, -EIO was returned on error prior
to this change and now it is whatever the error value that is
returned by kstrtouint.

Change the base value of the kstrtouint from 0 to 16 and return
-EIO on error.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:38:06 -07:00
Rasmus Villemoes
db55b62cab net: arcnet: Remove "#define bool int"
The header file include/linux/arcdevice.h #defines bool to int, if
bool is not already #defined. However, the files which use that header
file seem to rely on that #define (unconditionally) being in effect:
the prototypes for the functions arcrimi_reset, com20020_reset,
com90io_reset, com90xx_reset (whose addresses are assigned to the
hw.reset member of struct arcnet_local) use int explicitly.

Moreover, that #define is an accident waiting to happen (scenario:
inclusion of arcdevice.h followed by inclusion of some header which
declares function prototypes using bool). Also, #include
<linux/types.h> must appear before #include <linux/arcdevice.h> (the
compiler wouldn't like "typedef _Bool int").

Since none of the files using arcdevice.h declare variables of type
"bool", the patch is actually quite simple, unlike the commit message.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:34:43 -07:00
Govindarajulu Varadarajan
a16a336192 enic: fix return values in enic_set_coalesce
enic_set_coalesce() has two problems.

* It should return -EINVAL and not -EOPNOTSUPP for invalid coalesce values.

* In case of MSIX, enic_set_coalesce return error after applying requested
  coalescing setting partially. We should either apply all the setting requeste
  and return success or apply non and return error.

* This patch also simplifies the algo.

This was introduced by
'7c2ce6e60f703 enic: Add support for adaptive interrupt coalescing'

These changes were suggested by Ben Hutchings here
http://www.spinics.net/lists/netdev/msg283972.html

Also change enic driver version.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:33:46 -07:00
Jiri Pirko
e721f87d80 bonding: remove no longer relevant vlan warnings
These warnings are no longer relevant. Even when last slave is
removed, there is a valid address assigned to bond (random).
The correct functionality of vlans is ensured by maintaining unicast
list in vlan_sync_address().

Suggested-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:31:54 -07:00
David S. Miller
7cb9e6bfd6 Merge branch 'at86rf230-next'
Alexander Aring says:

====================
at86rf230: rework driver implementation

this patch series includes a rework of the at86rf230 driver.

There are several changes:

 - Add regmap support.
 - Merge at86rf212 operations with generic at86rf2xx operations, all chips
   supports these operations.
 - Drop of irqworker. This is a workqueue which will scheduled by an irq to
   handle synchronous spi handling. Instead using asynchronous spi handling,
   then no scheduler is involved at irq handling.
 - Also detected some bugs by receiving frame like CRC can be correct and a
   802.15.4 frame length could be above 127 bytes. This would crash the whole
   kernel (but should be handled by the mac layer). Another bug is the handling
   with RX_SAFE_MODE which protect the frame buffer after a readout. This is
   currently not working because we read out the buffer twice and the first one
   to get the frame size. Solution is to readout always the whole frame buffer.
 - Added some timing relevants things from the datasheet for state changes And
   IEEE 802.15.4 standard like interframe spacing. Interframe spacing is needed
   to insert some receiving space time between frame transmitting. This should be
   also handled by MAC layer, but it's currently a workaround to add this inside
   the driver layer.
 - Add some callback setting for chip specific handling, instead of runtime decisions
   if (is_chip_type()). Callbacks are set only once at probe time.
 - We don't using a force state change anymore. A force state change will do a
   abort of receiving frames while we want to transmit a new frame. This should
   decrease the drop rate of packets.
 - And many others changes and bug fixes...

changes since v3:
 - fix irq polarity in patch ("at86rf230: rework irq_pol setting").

changes since v2:
 - add check if necessary functions are implemented when hw flags are set in patch
   ("mac802154: at86rf230: add hw flags and merge ops"). I choosed the second variant.
 - remove unnecessary includes for workqueue and mutex in patch
   ("at86rf230: rework transmit and receive").
 - remove unnecessary cast in patch ("at86rf230: rework transmit and receive").
 - acivate regmap cache with REGCACHE_RBTREE in patch
   ("at86rf230: add regmap support").
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:31 -07:00
Alexander Aring
01ebd60b0a at86rf230: add new author
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
7a4ef91854 at86rf230: add sleep cycle timing
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
984e0c682c at86rf230: add timing for channel switch
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
09e536cd4f at86rf230: rework reset to trx_off state change
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
2e0571c0d6 at86rf230: rework state change and start/stop
This patch removes the current synchron state change function and add a
new function for a state assert. Change the start and stop callbacks to
use this new synchron state change behaviour. It's a wrapper around the
async state change function.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
1db0558e87 at86rf230: rework irq_pol setting
This patch rework the irq_pol register setting for rising and falling
interrupt settings only. The default behaviour should be rising flag.

Also use IRQ_TYPE_* defines instead of IRQF_* defines. There is no
functionality change but irq_get_trigger_type returns IRQ_TYPE_* defines.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
6bd2b132bf at86rf230: move RX_SAFE_MODE setting to hw_init
There is no need to set this bit in start callback which could be
called more than once.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:25 -07:00
Alexander Aring
1d15d6b5b9 at86rf230: rework transmit and receive handling
This patch is a complete reimplementation of transmit and receive
handling for the at86rf230 driver.

It solves also six bugs:

First:

The RX_SAFE_MODE is enabled and the transceiver doesn't leave the
receive state while the framebuffer isn't read by a CMD_FB command.
This is useful to read out the frame and don't get into another receive
or transmit state, otherwise the frame would be overwritten.
The current driver do twice CMD_FB calls, the first one leaves this
protection.

Second:

Sometimes the CRC calculation is correct and the length field is greater
127. The current mac802154 layer and filter of a at86rf2xx doesn't check
on this and the kernel crashes. In this case the frame is corrupted, we
send the whole receive buffer to the next layer which can be useful for
sniffing.

Thrid:
There is a undocumented race condition. When we are go into the
RX_AACK_ON state the transceiver could be changed into RX_AACK_BUSY
state. This is a normal behaviour. In this case the transceiver received
a SHR while assert wasn't finished.

Fourth:
It also handle some more "correct" state changes. In aret mode the
transceiver need to go to TX_ON before the transceiver go into
RX_AACK_ON.

Fifth:
The programming model [0] describes also a error handling in ARET mode
if the trac status is different than zero. This is patch adds support
for handling this.

Sixth:
In receive handling the transceiver should also get the trac status
according [0]. The driver could use the trac status as error statistic
handling, but the driver doesn't use this currently. There is maybe some
timing behaviour or the read of this register change some transceiver
states.

In addition the irqworker is removed. Instead we do async spi calls and
no scheduling is involved anymore. The transmit function is also
asynchron but with a wait_for_completion handling. The mac802154 layer
doesn't support asynchron transmit handling right now.

The state change behaviour is now changes, before it was:

1. assert while(!STATE_TRANSITION_IN_PROGRESS)
2. state change
3. assert while(!STATE_TRANSITION_IN_PROGRESS)
4. assert once(wanted state != current state)

Sometimes a unexcepted state change occurs when 4. assert was violated.
The new state change behaviour is:

1. assert while(!STATE_TRANSITION_IN_PROGRESS)
2. state change
3. wait state change timing according datasheet
4. assert once(wanted state != current state)

This behaviour is described in the at86rf231 software programming model [0].
The state change documentation in this programming guide should also valid for
at86rf212 and at86rf233 chips.

The transceiver don't do a FORCE_TX_ON while we want to transmit a PDU.
The new behaviour is a TX_ON and wait a receiving time (tFrame + tPAck).
If we are still in RX_AACK_BUSY then we transmit a FORCE_TX_ON as timeout
handling. The different is that FORCE_TX_ON aborts receiving and TX_ON
waits if RX_AACK_BUSY is finished. This should decrease the drop rate of
packets.

[0] http://www.atmel.com/Images/AVR2022_swpm231-2.0.zip

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
Alexander Aring
a7d7eda905 at86rf230: add support for at86rf23x desense
To set the CCA_ED_THRES register the calculation for at86rf23x is
different than for at86rf212. This patch adds a new callback for this
calculation in chip data struct.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
Alexander Aring
a53d1f7c3d at86rf230: remove is212 and add driver data
This patch adds a new at86rf2xx_chip_data structure which holds device
specific attributes. Instead of runtime decisions "if (is212())" we set
callbacks/attributes while device detection.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
Alexander Aring
c8ee0f56c8 at86rf230: rework detect device handling
This patch drops the current lowlevel spi calls for the detect device
function instead we handle this via regmap. Also put the detection of
in a seperate function and set all device specific attributes while detection.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
Alexander Aring
f76014f770 at86rf230: add regmap support
This patch adds regmap support for the at86rf230 driver and drop the
lowlevel spi access functions and use the regmap access functions.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
Alexander Aring
640985ec2f mac802154: at86rf230: add hw flags and merge ops
This patch adds new mac802154 hw flags for transmit power, csma and
listen before transmit (lbt). These flags indicates that the transceiver
supports these features. If the flags are set and the driver doesn't
implement the necessary functions, then ieee802154_register_device
returns -ENOSYS "Function not implemented".

This patch merges also all at86rf230 operations into one operations structure
and set the right hw flags for the at86rf230 transceivers.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:29:24 -07:00
David S. Miller
1598c36afd Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next
Jeff Kirsher says:

====================
Intel Wired LAN Driver Updates 2014-07-02

This series contains updates to i40e and i40evf.

Anjali fixes a possible race where we were trying to free the dummy packet
buffer in the function that created it, so cleanup the dummy packet buffer
in i40e_clean_tx_ring() instead.  Also fixes an issue where the filter
program routine was not checking if there were descriptors available for
programming a filter.

Mitch fixes unnecessary delays when sending the admin queue commands by
moving a declaration up one level so we do not dereference it out of scope.
Fixes an issue with the VF where if the admin queue interrupts get lost for
some reason, the VF communication will stall as the VFs have no way of
reaching the PF.  To alleviate this condition, go ahead and check the ARQ
every time we run the service task.  Updates i40evf to allow the watchdog
to fire vector 0 via software, which makes the driver tolerant of dropped
interrupts on that vector.

Paul fixes a shifted '1' to be unsigned to avoid shifting a signed integer.

Jesse disables TPH by default since it is currently not enabled in the
current hardware.  Also finishes the i40e implementation of get_settings
for ethtool.

Catherine adds a new variable (hw.phy.link_info.an_enabled) to track whether
auto-negotiation is enabled, along with the functionality to update the
variable.  Adds the functionality to set the requested flow control mode.
Adds i40e implementation of setpauseparam and set_settings to ethtool.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:22:58 -07:00
David S. Miller
dbaaca81c3 Merge branch 'fec-next'
Russell King says:

====================
Freescale ethernet driver updates

Here's the first batch of patches for the Freescale FEC ethernet driver.
They require the previously applied "net: fec: Don't clear IPV6 header
checksum field when IP accelerator enable" patch.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:45 -07:00
Russell King
ffdce2cc6a net: fec: fix missing kmalloc() failure check in fec_enet_alloc_buffers()
fec_enet_alloc_buffers() assumes that kmalloc() will never fail, which
is an invalid assumption.  Fix this by implementing a common error
cleanup path, and use it to also clean up after failed bounce buffer
allocation.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:23 -07:00
Russell King
8b7c9efa01 net: fec: ensure fec_enet_free_buffers() properly cleans the rings
Ensure that we do not double-free any allocations, and that any transmit
skbuffs are properly freed when we clean up the rings.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
d6bf31431b net: fec: clean up transmit descriptor setup
Avoid writing any state until we're certain we can proceed with the
transmission: this avoids writing mapping error address values to the
descriptors, or setting the skbuff pointer until we have successfully
mapped the skb.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
730ee3602f net: fec: make rx skb handling more robust
Allocate, and then map the receive skb before writing any data to the
ring descriptor or storing the skb.  When freeing the receive ring
entries, unmap and free the skb, and then clear the stored skb pointer.

This means we have ring data and skb pointer in one of two states:
either both fully setup, or nothing setup.

This simplifies the cleanup, as we can use just the skb pointer to
indicate whether the descriptor is setup, and thus avoids potentially
calling dma_unmap_single() on a DMA error value.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
5d165c5543 net: fec: remove useless fep->opened
napi_disable() waits until the NAPI processing has completed, and then
prevents any further polls.  At this point, the driver then clears
fep->opened.  The NAPI poll function uses this to stop processing in
the receive path.  Hence, it will never see this variable cleared,
because the NAPI poll has to complete before it will be cleared.

Therefore, this variable serves no purpose, so let's remove it.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
d76cfae967 net: fec: stop the phy before shutting down the MAC
When the network interface goes down, stop the phy to prevent further
link up status changes before taking the MAC or netif sections down.
This prevents further reception of link up events which could
potentially call fec_restart().

Since phy_stop() takes the mutex which adjust_link() runs under, we
also ensure that adjust_link() will not already be processing a link
up event.

We also need to do this when suspending as well - we don't want a
mis-timed phy state change to restart the MAC after we have stopped
it for suspend, and thus need to restart the phy when resuming.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
0b146ca8d4 net: fec: ensure that a disconnected phy isn't configured
When we disconnect from a phy, we should forget our pointer to it so we
don't accidentally try to configure it.  We handle a NULL phy pointer
correctly in most places, except fec_enet_set_pauseparam().  Fix this
too.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
635cf17ce2 net: fec: remove checking for NULL phy_dev in fec_enet_close()
fep->phy_dev can not be NULL here for two reasons:
- fec_enet_open() will have successfully connected the phy, or will have
  failed.
- fec_enet_open() will have called phy_start(fep->phy_dev), which
  unconditionally dereferences this pointer.

If it were to be NULL here, then fec_enet_open() will have already
oopsed.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:22 -07:00
Russell King
b49cd504c4 net: fec: use netif_tx_disable() rather than netif_stop_queue()
We use netif_stop_queue() in several places where we want to ensure that
the start_xmit function is not running.  netif_stop_queue() is not
sufficient to achieve that - it merely sets a flag to indicate that the
transmit queue(s) should not be run.

netif_tx_disable() gives this guarantee, since it takes the transmit
queue lock while marking the queue stopped.  This will wait for the
transmit function to complete before returning.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:21 -07:00
Russell King
7a16807ce1 net: fec: fix interrupt handling races
While running: while :; do iperf -c <HOST> -P 4; done, transmit timeouts
are regularly reported.  With the tx ring dumping in place, we can see
that all entries are in use, and the hardware has finished transmitting
these packets.  However, the driver has not reclaimed these ring
entries.

This can occur if the interrupt handler is invoked at the wrong moment -
eg:

	CPU0				CPU1
	fec_enet_tx()
					interrupt, IEVENT = FEC_ENET_TXF
					FEC_ENET_TXF cleared
					napi_schedule_prep()
	napi_complete()

The result is that we clear the transmit interrupt, but we don't trigger
any cleaning of the transmit ring.  Instead, use a different strategy:

- When receiving a transmit or receive interrupt, disable both tx and rx
  interrupts, but do not acknowledge them.  Schedule a napi poll.  Don't
  loop.

- When we are polled, read IEVENT, acknowledging the pending transmit
  and receive interrupts, before then going on to process the
  appropriate rings.

This allows us to avoid the race, and has a number of other advantages:
- we cut down on the number of transmit interrupts we have to process.
- we only look at the rings which have pending events.
- we gain additional throughput: the iperf total bandwidth increases
  from about 180Mbps to 240Mbps:

[  3]  0.0-10.0 sec  68.1 MBytes  57.0 Mbits/sec
[  5]  0.0-10.0 sec  72.4 MBytes  60.5 Mbits/sec
[  4]  0.0-10.1 sec  76.1 MBytes  63.5 Mbits/sec
[  6]  0.0-10.1 sec  71.9 MBytes  59.9 Mbits/sec
[SUM]  0.0-10.1 sec   288 MBytes   241 Mbits/sec

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:21 -07:00
Russell King
9671a42e45 net: fec: fix ethtool set_pauseparam duplex bug
Setting the pause parameters causes a running network interface to be
restarted.  However, the restart forces the FEC into half-duplex mode,
whether or not the remote end is in half-duplex mode.  Misconfigured
duplex mode is a known source of problems on a link.

Fix this by always preserving the duplex mode on configuration changes.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:21 -07:00
Russell King
b44592ffb8 net: fec: iMX6 FEC does not support half-duplex gigabit
The iMX6 gigabit FEC does not support half-duplex gigabit operation.
Phys attacked to the FEC may support this, and we currently do nothing
to disable this feature.  This may result in an invalid configuration.
Mask out phy support for gigabit half-duplex operation.

Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:21:21 -07:00
David S. Miller
6c035ea0a2 Merge branch 'net-hash-tx'
Tom Herbert says:

====================
net: Improvements and applications of packet flow hash in transmit path

This patch series includes some patches which improve and make use
of skb->hash in the transmit path.

What is included:

- Infrastructure to save a precomputed hash in the sock structure.
  For connected TCP and UDP sockets we only need to compute the
  flow hash once and not once for every packet.
- Call skb_get_hash in get_xps_queue and __skb_tx_hash. This eliminates
  the awkward access to skb->sk->sk_hash in the lower transmit path.
- Move UDP source port generation into a common function in udp.h This
  implementation is mostly based on vxlan_src_port.
- Use non-zero IPv6 flow labels in flow_dissector as port information
  for flow hash calculation.
- Implement automatic flow label generation on transmit (per RFC 6438).
- Don't repeatedly try to compute an L4 hash in skb_get_hash if we've
  already tried to find one in software stack calculation.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:29 -07:00
Tom Herbert
a3b18ddb9c net: Only do flow_dissector hash computation once per packet
Add sw_hash flag to skbuff to indicate that skb->hash was computed
from flow_dissector. This flag is checked in skb_get_hash to avoid
repeatedly trying to compute the hash (ie. in the case that no L4 hash
can be computed).

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
cb1ce2ef38 ipv6: Implement automatic flow label generation on transmit
Automatically generate flow labels for IPv6 packets on transmit.
The flow label is computed based on skb_get_hash. The flow label will
only automatically be set when it is zero otherwise (i.e. flow label
manager hasn't set one). This supports the transmit side functionality
of RFC 6438.

Added an IPv6 sysctl auto_flowlabels to enable/disable this behavior
system wide, and added IPV6_AUTOFLOWLABEL socket option to enable this
functionality per socket.

By default, auto flowlabels are disabled to avoid possible conflicts
with flow label manager, however if this feature proves useful we
may want to enable it by default.

It should also be noted that FreeBSD has already implemented automatic
flow labels (including the sysctl and socket option). In FreeBSD,
automatic flow labels default to enabled.

Performance impact:

Running super_netperf with 200 flows for TCP_RR and UDP_RR for
IPv6. Note that in UDP case, __skb_get_hash will be called for
every packet with explains slight regression. In the TCP case
the hash is saved in the socket so there is no regression.

Automatic flow labels disabled:

  TCP_RR:
    86.53% CPU utilization
    127/195/322 90/95/99% latencies
    1.40498e+06 tps

  UDP_RR:
    90.70% CPU utilization
    118/168/243 90/95/99% latencies
    1.50309e+06 tps

Automatic flow labels enabled:

  TCP_RR:
    85.90% CPU utilization
    128/199/337 90/95/99% latencies
    1.40051e+06

  UDP_RR
    92.61% CPU utilization
    115/164/236 90/95/99% latencies
    1.4687e+06

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
19469a873b flow_dissector: Use IPv6 flow label in flow_dissector
This patch implements the receive side to support RFC 6438 which is to
use the flow label as an ECMP hash. If an IPv6 flow label is set
in a packet we can use this as input for computing an L4-hash. There
should be no need to parse any transport headers in this case.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
535fb8d006 vxlan: Call udp_flow_src_port
In vxlan and OVS vport-vxlan call common function to get source port
for a UDP tunnel. Removed vxlan_src_port since the functionality is
now in udp_flow_src_port.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
b8f1a55639 udp: Add function to make source port for UDP tunnels
This patch adds udp_flow_src_port function which is intended to be
a common function that UDP tunnel implementations call to set the source
port. The source port is chosen so that a hash over the outer headers
(IP addresses and UDP ports) acts as suitable hash for the flow of the
encapsulated packet. In this manner, UDP encapsulation works with RSS
and ECMP based wrt the inner flow.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
0e001614e8 net: Call skb_get_hash in get_xps_queue and __skb_tx_hash
Call standard function to get a packet hash instead of taking this from
skb->sk->sk_hash or only using skb->protocol.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
b73c3d0e4f net: Save TX flow hash in sock and set in skbuf on xmit
For a connected socket we can precompute the flow hash for setting
in skb->hash on output. This is a performance advantage over
calculating the skb->hash for every packet on the connection. The
computation is done using the common hash algorithm to be consistent
with computations done for packets of the connection in other states
where thers is no socket (e.g. time-wait, syn-recv, syn-cookies).

This patch adds sk_txhash to the sock structure. inet_set_txhash and
ip6_set_txhash functions are added which are called from points in
TCP and UDP where socket moves to established state.

skb_set_hash_from_sk is a function which sets skb->hash from the
sock txhash value. This is called in UDP and TCP transmit path when
transmitting within the context of a socket.

Tested: ran super_netperf with 200 TCP_RR streams over a vxlan
interface (in this case skb_get_hash called on every TX packet to
create a UDP source port).

Before fix:

  95.02% CPU utilization
  154/256/505 90/95/99% latencies
  1.13042e+06 tps

  Time in functions:
    0.28% skb_flow_dissect
    0.21% __skb_get_hash

After fix:

  94.95% CPU utilization
  156/254/485 90/95/99% latencies
  1.15447e+06

  Neither __skb_get_hash nor skb_flow_dissect appear in perf

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:21 -07:00
Tom Herbert
5ed20a68cd flow_dissector: Abstract out hash computation
Move the hash computation located in __skb_get_hash to be a separate
function which takes flow_keys as input. This will allow flow hash
computation in other contexts where we only have addresses and ports.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 21:14:20 -07:00
David S. Miller
081a20ffcc Merge branch 'systemport-next'
Florian Fainelli says:

====================
net: systemport: PM and Wake-on-LAN support

This patchset brings Power Management and Wake-on-LAN support to the
Broadcom SYSTEM PORT driver.

S2 and S3 modes are supported, while we only support Wake-on-LAN using
MagicPackets for now
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 20:56:55 -07:00
Florian Fainelli
83e82f4c70 net: systemport: add Wake-on-LAN support
Support for Wake-on-LAN using Magic Packet with or without SecureOn
password is implemented doing the following:

- setting the password to the relevant UniMAC registers
- flagging the device as a wakeup source for the system, as well as
  its Wake-on-LAN interrupt
- prepare the hardware for entering WoL mode
- enabling the MPD interrupt to wake us

The Device Tree binding documentation is also reflected to specify the
third optional Wake-on-LAN interrupt line.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-07 20:56:47 -07:00