In an earlier patch, code was added to pad packets that were less that
ETH_ZLEN (60) bytes using the skb_pad function.  This has caused hangs when
accessing certain NFS mounted file systems.  This patch removes the check
and solves the NFS problem.  The driver, with this patch, has been tested
extensively.  Please apply.
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Cc: Stephen Hemminger <shemminger@osdl.org>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Cosmetic patch: give the variable holding the numer of descriptors
a more descriptive name, so to avoid confusion.
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Implement basic low-watermark support for the transmit queue.
Hardware low-watermarks allow a properly configured kernel
to continously stream data to a device and not have to handle
any interrupts at all in doing so. Correct zero-interrupt
operation can be actually observed for this driver, when the
socket buffer is made large enough.

The basic idea of a low-watermark interrupt is as follows.
The device driver queues up a bunch of packets for the hardware
to transmit, and then kicks the hardware to get it started.
As the hardware drains the queue of pending, untransmitted
packets, the device driver will want to know when the queue
is almost empty, so that it can queue some more packets.

If the queue drains down to the low waterark, then an interrupt
will be generated. However, if the kernel/driver continues
to add enough packets to keep the queue partially filled,
no interrupt will actually be generated, and the hardware
can continue streaming packets indefinitely in this mode.

The impelmentation is done by setting the DESCR_TXDESFLG flag
in one of the packets. When the hardware sees this flag, it will
interrupt the device driver. Because this flag is on a fixed
packet, rather than at  fixed location in the queue, the
code below needs to move the flag as more packets are
queued up. This implementation attempts to keep the flag
at about 1/4 from "empty".
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

The current receive interrupt mask sets a bogus bit that doesn't even
belong to the definition of this register. Remove it.
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This patch fixes the names of a few fields in the DMA control
register. There is no functional change.
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This patch increases the Burst Address alignment from 64 to 1024 in the
Spidernet driver. This improves transmit performance for large packets.

From: James K Lewis <jklewis@us.ibm.com>
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

This patch adds version information as reported by
ethtool -i to the Spidernet driver.

From: James K Lewis <jklewis@us.ibm.com>
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Add the ethtool -S (show statistics) feature to the Spidernet ethernet
driver.  I have tested it extensively and believe it is ready to be
applied.
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Signed-off-by: NJeff Garzik <jeff@garzik.org>

Add ethtool -g (show ring sizes) support to the Spidernet network driver.
Signed-off-by: NJames K Lewis <jklewis@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

With this patch TX queue descriptors are not chained per default any more.
The pointer to next descriptor is set only when next descriptor is prepaired
for transfer. Also the mechanism of checking wether Spider is ready has been
changed: it checks not for CARDOWNED flag in status of previous descriptor
but for a TXDMAENABLED flag in Spider's register.
Signed-off-by: NMaxim Shchetynin <maxim@de.ibm.com>
Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: NJens Osterkamp <Jens.Osterkamp@de.ibm.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

We found a new chip setting that we need in order
to make the driver work more reliable.
Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: NStephen Hemminger <shemminger@osdl.org>

Performance optimizations, changes in these areas:
  - RX and TX checksum offload
  - correct maximum MTU
  - don't use TX interrupts anymore, use a timer instead
  - remove some superfluous barriers
  - improve RX RAM full handling

From: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: NJens Osterkamp <jens.osterkamp@de.ibm.com>
Signed-off-by: NArnd Bergmann <arndb@de.ibm.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

The driver incorrectly used dma_addr_t to describe
HW structures and consequently broke when that type
was changed in 2.6.15-rc.

This changed spidernet to use u32 for 32 bit HW defined
structure elements.

From: Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
Signed-off-by: NJens Osterkamp <Jens.Osterkamp@de.ibm.com>
Signed-off-by: NArnd Bergmann <arndb@de.ibm.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

This patch adds a driver for a new 1000 Mbit ethernet NIC.  It is
integrated on the south bridge that is used for our Cell Blades.

The code gets the MAC address from the Open Firmware device tree, so it
won't compile on platforms other than ppc64.

This is the first public release, so I don't expect the first version to
get merged, but I'd aim for integration within the 2.6.13 time frame.

Cc: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: NArnd Bergmann <arndb@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>