linux-toradex.git/drivers/net/ibmveth.h, branch v2.6.27.49

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

ibmveth: Enable TCP checksum offload

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

This patchset enables TCP checksum offload support for IPV4
on ibmveth. This completely eliminates the generation and checking of
the checksum for packets that are completely virtual and never
touch a physical network. A simple TCP_STREAM netperf run on
a virtual network with maximum mtu set yielded a ~30% increase
in throughput. This feature is enabled by default on systems that
support it, but can be disabled with a module option.

Signed-off-by: Brian King 
Signed-off-by: Jeff Garzik 
Signed-off-by: David S. Miller

[NET]: Make NAPI polling independent of struct net_device objects.

2007-10-10T23:47:45+00:00

Several devices have multiple independant RX queues per net
device, and some have a single interrupt doorbell for several
queues.

In either case, it's easier to support layouts like that if the
structure representing the poll is independant from the net
device itself.

The signature of the ->poll() call back goes from:

	int foo_poll(struct net_device *dev, int *budget)

to

	int foo_poll(struct napi_struct *napi, int budget)

The caller is returned the number of RX packets processed (or
the number of "NAPI credits" consumed if you want to get
abstract).  The callee no longer messes around bumping
dev->quota, *budget, etc. because that is all handled in the
caller upon return.

The napi_struct is to be embedded in the device driver private data
structures.

Furthermore, it is the driver's responsibility to disable all NAPI
instances in it's ->stop() device close handler.  Since the
napi_struct is privatized into the driver's private data structures,
only the driver knows how to get at all of the napi_struct instances
it may have per-device.

With lots of help and suggestions from Rusty Russell, Roland Dreier,
Michael Chan, Jeff Garzik, and Jamal Hadi Salim.

Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra,
Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan.

[ Ported to current tree and all drivers converted.  Integrated
  Stephen's follow-on kerneldoc additions, and restored poll_list
  handling to the old style to fix mutual exclusion issues.  -DaveM ]

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

ibmveth: Fix rx pool deactivate oops

2007-08-07T21:34:13+00:00

This fixes the following oops which can occur when trying to deallocate
receive buffer pools using sysfs with the ibmveth driver.

NIP: d00000000024f954 LR: d00000000024fa58 CTR: c0000000000d7478
REGS: c00000000ffef9f0 TRAP: 0300   Not tainted  (2.6.22-ppc64)
MSR: 8000000000009032   CR: 24242442  XER: 00000010
DAR: 00000000000007f0, DSISR: 0000000042000000
TASK = c000000002f91360[2967] 'bash' THREAD: c00000001398c000 CPU: 2
GPR00: 0000000000000000 c00000000ffefc70 d000000000262d30 c00000001c4087a0
GPR04: 00000003000000fe 0000000000000000 000000000000000f c000000000579d80
GPR08: 0000000000365688 c00000001c408998 00000000000007f0 0000000000000000
GPR12: d000000000251e88 c000000000579d80 00000000200957ec 0000000000000000
GPR16: 00000000100b8808 00000000100feb30 0000000000000000 0000000010084828
GPR20: 0000000000000000 000000001014d4d0 0000000000000010 c00000000ffefeb0
GPR24: c00000001c408000 0000000000000000 c00000001c408000 00000000ffffb054
GPR28: 00000000000000fe 0000000000000003 d000000000262700 c00000001c4087a0
NIP [d00000000024f954] .ibmveth_remove_buffer_from_pool+0x38/0x108 [ibmveth]
LR [d00000000024fa58] .ibmveth_rxq_harvest_buffer+0x34/0x78 [ibmveth]
Call Trace:
[c00000000ffefc70] [c0000000000280a8] .dma_iommu_unmap_single+0x14/0x28 (unreliable)
[c00000000ffefd00] [d00000000024fa58] .ibmveth_rxq_harvest_buffer+0x34/0x78 [ibmveth]
[c00000000ffefd80] [d000000000250e40] .ibmveth_poll+0xd8/0x434 [ibmveth]
[c00000000ffefe40] [c00000000032da8c] .net_rx_action+0xdc/0x248
[c00000000ffefef0] [c000000000068b4c] .__do_softirq+0xa8/0x164
[c00000000ffeff90] [c00000000002789c] .call_do_softirq+0x14/0x24
[c00000001398f6f0] [c00000000000c04c] .do_softirq+0x68/0xac
[c00000001398f780] [c000000000068ca0] .irq_exit+0x54/0x6c
[c00000001398f800] [c00000000000c8e4] .do_IRQ+0x170/0x1ac
[c00000001398f890] [c000000000004790] hardware_interrupt_entry+0x18/0x1c
   Exception: 501 at .plpar_hcall_norets+0x24/0x94
    LR = .veth_pool_store+0x15c/0x298 [ibmveth]
[c00000001398fb80] [d000000000250b2c] .veth_pool_store+0x5c/0x298 [ibmveth] (unreliable)
[c00000001398fc30] [c000000000145530] .sysfs_write_file+0x140/0x1d8
[c00000001398fcf0] [c0000000000de89c] .vfs_write+0x120/0x208
[c00000001398fd90] [c0000000000df2c8] .sys_write+0x4c/0x8c
[c00000001398fe30] [c0000000000086ac] syscall_exit+0x0/0x40
Instruction dump:
fba1ffe8 fbe1fff8 789d0022 f8010010 f821ff71 789c0020 1d3d00a8 7b8a1f24
38000000 7c7f1b78 7d291a14 e9690128 <7c0a592a> e8030000 e9690120 80a90100

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

[PATCH] ibmveth: Remove ibmveth "liobn" field

2006-12-04T09:38:06+00:00

Remove the now unused "liobn" field in ibmveth which also avoids
having insider knowledge of the iommu table in that driver.

Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Santiago Leon 
Signed-off-by: Paul Mackerras

[POWERPC] clean up pseries hcall interfaces

2006-08-01T06:19:15+00:00

Our pseries hcall interfaces are out of control:

	plpar_hcall_norets
	plpar_hcall
	plpar_hcall_8arg_2ret
	plpar_hcall_4out
	plpar_hcall_7arg_7ret
	plpar_hcall_9arg_9ret

Create 3 interfaces to cover all cases:

	plpar_hcall_norets:	7 arguments no returns
	plpar_hcall:		6 arguments 4 returns
	plpar_hcall9:		9 arguments 9 returns

There are only 2 cases in the kernel that need plpar_hcall9, hopefully
we can keep it that way.

Pass in a buffer to stash return parameters so we avoid the &dummy1,
&dummy2 madness.

Signed-off-by: Anton Blanchard 
--
Signed-off-by: Paul Mackerras

[POWERPC] Instrument Hypervisor Calls: merge headers

2006-07-31T05:56:35+00:00

Move all the Hypervisor call definitions to to a single header file.

Signed-off-by: Mike Kravetz 
Signed-off-by: Paul Mackerras