Move the Exar drivers into drivers/net/ethernet/neterion/ and make the
necessary Kconfig and Makefile changes.

CC: Jon Mason <jdmason@kudzu.us>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Hardware time stamp calculation can only be enabled by the privileged
function. Enable it always by default and simply use the ethtool
interface to set a flag to indicate whether or not the respective
function driver should indicate the timestamp along with the received
packet.

Also, make certain fields in vxge_hw_device_config bit-fields to reduce
the size of the struct.
Signed-off-by: NJon Mason <jdmason@kudzu.us>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>

To reduce the possibility of losing an interrupt in the handler due to a
race between an interrupt processing and disable/enable of interrupts,
enable MSIX one shot.

Also, add support for adaptive interrupt coalesing
Signed-off-by: NJon Mason <jon.mason@exar.com>
Signed-off-by: NMasroor Vettuparambil <masroor.vettuparambil@exar.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Move function locations to remove the need for internal declarations and
other misc clean-ups.
Signed-off-by: NJon Mason <jon.mason@exar.com>
Signed-off-by: NArpit Patel <arpit.patel@exar.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Enable RSS hashing and add ability to pass up the adapter calculated rx
hash up the network stack (if feature is available).  Add the ability to
enable/disable feature via ethtool, which requires that the adapter is
not running at the time.  Other miscellaneous cleanups and fixes
required to get RSS working.
Signed-off-by: NJon Mason <jon.mason@exar.com>
Signed-off-by: NRam Vepa <ram.vepa@exar.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

"gadget", "through", "command", "maintain", "maintain", "controller", "address",
"between", "initiali[zs]e", "instead", "function", "select", "already",
"equal", "access", "management", "hierarchy", "registration", "interest",
"relative", "memory", "offset", "already",
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Use results of make namespacecheck to make functions local and
remove code that is not used.

Also rename initialize_ethtool_ops to vxge_initialize_ethtool_ops.

Compile tested only.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Update copyright information to reflect the Exar purchase of Neterion
Signed-off-by: NJon Mason <jon.mason@exar.com>
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@exar.com>
Signed-off-by: NRamkrishna Vepa <ramkrishna.vepa@exar.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

- Fixed MSIX interrupt configuration to support non contiguous vpaths in
  functions. Four msi-x vectors are reserved per vpath internal to the chip.
  In all, there are 68 msi-x vectors for the 17 vpaths in the chip. In the
  multi function configurations, non-contiguous vpaths are configured to
  represent a function. For instance vpaths 0 and 8 can be configured to
  represent function zero.

- If pci_enable_msix fails for the requested vectors, try with a lesser number
  vectors by reducing the vpath count.
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

- Fix starvation of receive ring controller when blasted by short packets. This was because the driver was posting 64 rxds initially while the ring controller
was expecting to read 256 replenished rxds. While the driver was coming up,
the internal rxd memory filled up the 64 buffers provided and the ring
controller was left waiting for the remaining 192 rxds to complete the write
back of completed rxds to the host and generation of an interrupt.
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

- Fix a receive stall due to driver being out of synch with chip. In a corner
case scenario the adapter's ring controller may return a RxD with transfer code
of 0xC, while the host ownership bit is still set to the adapter. The driver
needs to assume that this case where (host_ownership == 1 or adapter) and
(transfer_code == 0xC) is valid, that is, this RxD has been returned by the
receive ring controller but no frame data is associated with the rxd.

- Restore the transfer code field of each newly replenished RxD to 0x0.

- Code cleanup. Removed usage of magic numbers.
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

- Allow multiple functions with INTA.
- Removed the condition to allow only one vpath with INTA
- Ensure that the alarm bit in titan_mask_all_int register is cleared when
  driver exits.
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch fixes a case in the transmit completion code which was resulting
in pktgen hanging at the end of a run.  The cause is due to the fact that
the ->cb[] area of an skb cannot be used in a network driver's transmit
path, as that area belongs to the network protocol.  Pktgen hangs, as it
sends out the same packet multiple times, and vxge's use of this area of
the skb for a temporary list can only add the packet to the temporary list
once (while it may be on the queue many times).  The fix is to remove this
abuse of skb->cb[].  Instead, skb pointers are placed into a temporary
stack array, and then free outside of the tx lock.  This retains the smp
optimization of doing dev_kfree_skb() outside of the tx lock.
Signed-off-by: NBenjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

- Removed the code to bounds check the mss value. The hardware does bounds checking and
will not allow an oversized mss to lockup the transmit path.
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This reverts commit 01198304.

Causes warnings in the build as reported by Stephen Rothwell.
So this change is worse than what it's curing.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NAlexander Beregalov <a.beregalov@gmail.com>
Acked-by: NRam Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch takes care of trafic handling related APIS.
- Interrupt Enable and disable
- Mask / Unmask Interrupt
- Traffic Interrupt handling.
- Alarm Interrupt handling.

- Changes in this submission -
        - General clean up - removed redundant includes, defines and macros.

- Changes in previous submissions -
 - General cleanup - removed unused functions and variables.
 - Use asserts where necessary - Reported by Andi Kleen
 - Fixed sparse warnings - Reported by Andi Kleen
 - Use a prefix, "__vxge" in front of hw functions to make them globally
   unique - Ben Hutchings
Signed-off-by: NSivakumar Subramani <sivakumar.subramani@neterion.com>
Signed-off-by: NRastapur Santosh <santosh.rastapur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>