linux-toradex.git/drivers/net/ibmveth.h, branch v3.0-rc4

ibmveth: Update module information and version

2010-09-07T01:21:56+00:00

Add an entry to the MAINTAINERS file for ibmveth, clean up the copyright
and add all authors. Change the name of the module to reflect the product name
over the last number of years.

Considering all the changes we have made, bump the driver version.

Signed-off-by: Anton Blanchard 
Signed-off-by: Santiago Leon 
Signed-off-by: David S. Miller

ibmveth: Some formatting fixes

2010-09-07T01:21:53+00:00

IbmVethNumBufferPools -> IBMVETH_NUM_BUFF_POOLS

Also change IBMVETH_MAX_MTU -> IBMVETH_MIN_MTU, it refers to the minimum
size not the maximum.

Signed-off-by: Anton Blanchard 
Signed-off-by: Santiago Leon 
Signed-off-by: David S. Miller

ibmveth: Enable IPv6 checksum offload

2010-09-07T01:21:50+00:00

This patch enables TCP checksum offload support for IPv6 on ibmveth.
This completely eliminates the generation and checking of the checksum
for IPv6 packets that are completely virtual and never touch a physical
network.  A basic TCPIPV6_STREAM netperf run showed a ~30% throughput
improvement when an MTU of 64000 was used.

This featured is enabled by default, as is the case for IPv4 checksum
offload.  When checksum offload is enabled the driver will negotiate
IPv4 and IPv6 offload with the firmware separately and enable what
is available.  As long as either IPv4 or IPv6 offload is supported
and enabled the device will report that checksum offload is enabled.
The device stats, available through ethtool, will display which
checksum offload features are supported/enabled by firmware.

Performance testing against a stock kernel shows no regression for IPv4
or IPv6 in terms of throughput or processor utilization with checksum
disabled or enabled.

Signed-off-by: Robert Jennings 
Signed-off-by: Santiago Leon 
Signed-off-by: David S. Miller

ibmveth: Remove LLTX

2010-09-07T01:20:33+00:00

The ibmveth adapter needs locking in the transmit routine to protect
the bounce_buffer but it sets LLTX and forgets to add any of its own
locking.

Just remove the deprecated LLTX option. Remove the stats lock in the process.

Signed-off-by: Anton Blanchard 
Signed-off-by: Santiago Leon 
Signed-off-by: David S. Miller

ibmveth: batch rx buffer replacement

2010-09-07T01:20:32+00:00

At the moment we try and replenish the receive ring on every rx interrupt.
We even have a pool->threshold but aren't using it.

To limit the maximum latency incurred when refilling, change the threshold
from 1/2 to 7/8 and reduce the largest rx pool from 768 buffers to 512 which
should be more than enough.

Signed-off-by: Anton Blanchard 
Signed-off-by: Santiago Leon 
Signed-off-by: David S. Miller

ibmveth: use consistent types

2009-01-06T18:47:44+00:00

These variables are only used with an interface that just dumps their
values into registers to be passed to the hypervisor. The arguments
to that interface are declared to be "unsigned long", so make these
variables match.  The macros are only used with these variables, so make
them match as well.

This code is currently only built for 64bit powerpc, so the transformation
is really a noop.  If the interface was ever ported to 32 bit, it would
almost certainly still use registers to pass the parameters and so
"unsigned long" would still be appropriate.

Signed-off-by: Stephen Rothwell 
Signed-off-by: David S. Miller

ibmveth: enable driver for CMO

2008-07-25T05:44:44+00:00

Enable ibmveth for Cooperative Memory Overcommitment (CMO).  For this driver
it means calculating a desired amount of IO memory based on the current MTU
and updating this value with the bus when MTU changes occur.  Because DMA
mappings can fail, we have added a bounce buffer for temporary cases where
the driver can not map IO memory for the buffer pool.

The following changes are made to enable the driver for CMO:
 * DMA mapping errors will not result in error messages if entitlement has
   been exceeded and resources were not available.
 * DMA mapping errors are handled gracefully, ibmveth_replenish_buffer_pool()
   is corrected to check the return from dma_map_single and fail gracefully.
 * The driver will have a get_desired_dma function defined to function
   in a CMO environment.
 * When the MTU is changed, the driver will update the device IO entitlement

Signed-off-by: Robert Jennings 
Signed-off-by: Brian King 
Signed-off-by: Santiago Leon 
Acked-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

ibmveth: Remove use of bitfields

2007-10-10T23:50:46+00:00

Removes the use of bitfields from the ibmveth driver. This results
in slightly smaller object code.

Signed-off-by: Brian King 
Signed-off-by: Jeff Garzik

ibmveth: Remove dead frag processing code

2007-10-10T23:50:45+00:00

Removes dead frag processing code from ibmveth. Since NETIF_F_SG was
not set, this code was never executed. Also, since the ibmveth
interface can only handle 6 fragments, core networking code would need
to be modified in order to efficiently enable this support.

Signed-off-by: Brian King 
Signed-off-by: Jeff Garzik

ibmveth: Implement ethtool hooks to enable/disable checksum offload

2007-10-10T23:50:43+00:00

This patch adds the appropriate ethtool hooks to allow for enabling/disabling
of hypervisor assisted checksum offload for TCP.

Signed-off-by: Brian King 
Signed-off-by: Jeff Garzik