linux/drivers/ntb, branch v4.5

NTB: Fix macro parameter conflict with field name

2016-01-22T00:53:10Z

If the parameter given to the macro is replaced throughout the macro as it is evaluated. The intent is that the macro parameter should replace the only the first parameter to container_of(). However, the way the macro was written, it would also inadvertantly replace a structure field name. If a parameter of any other name is given to the macro, it will fail to compile, if the structure does not contain a field of the same name. At worst, it will compile, and hide improper access of an unintended field in the structure. Change the macro parameter name, so it does not conflict with the structure field name. Signed-off-by: Allen Hubbe Acked-by: Dave Jiang Signed-off-by: Jon Mason

NTB: Add support for AMD PCI-Express Non-Transparent Bridge

2016-01-22T00:51:04Z

This adds support for AMD's PCI-Express Non-Transparent Bridge (NTB) device on the Zeppelin platform. The driver connnects to the standard NTB sub-system interface, with modification to add hooks for power management in a separate patch. The AMD NTB device has 3 memory windows, 16 doorbell, 16 scratch-pad registers, and supports up to 16 PCIe lanes running a Gen3 speeds. Signed-off-by: Xiangliang Yu Reviewed-by: Allen Hubbe Signed-off-by: Jon Mason

ntb: ntb perf tool

2016-01-18T03:08:05Z

Providing raw performance data via a tool that directly access data from NTB w/o any software overhead. This allows measurement of the hardware performance limit. In revision one we are only doing single direction CPU and DMA writes. Eventually we will provide bi-directional writes. The measurement using DMA engine for NTB performance measure does not measure the raw performance of DMA engine over NTB due to software overhead. But it should provide the peak performance through the Linux DMA driver. Signed-off-by: Dave Jiang Tested-by: Allen Hubbe Signed-off-by: Jon Mason

NTB: Address out of DMA descriptor issue with NTB

2016-01-11T15:01:27Z

The transport right now does not handle the case where we run out of DMA descriptors. We just fail when we do not succeed. Adding code to retry for a bit attempting to use the DMA engine instead of instantly fail to CPU copy. Signed-off-by: Dave Jiang Reviewed-by: Allen Hubbe Signed-off-by: Jon Mason

NTB: Clear property bits in BAR value

2016-01-11T14:51:17Z

The lower bits read from a BAR register will contain property bits that we do not care about. Clear those so that we can use the BAR values for limit and xlat registers. Reported-by: Conrad Meyer Signed-off-by: Dave Jiang Signed-off-by: Jon Mason

NTB: ntb_process_tx error path bug

2016-01-11T14:51:17Z

The transmit overrun avoidance error path in ntb_process_tx accidentally swapped the first two values being passed to the tx_handler client. This could result in crashes in the ntb_netdev (or other out-of-tree NTB clients). Reported-by: Alex Depoutovitch Signed-off-by: Jon Mason

NTB: fix 32-bit compiler warning

2015-11-08T21:24:43Z

resource_size_t may be 32-bit wide on some architectures, which causes this warning when building the NTB code: drivers/ntb/ntb_transport.c: In function 'ntb_transport_link_work': drivers/ntb/ntb_transport.c:828:46: warning: right shift count >= width of type [-Wshift-count-overflow] The warning is harmless but can be avoided by using the upper_32_bits() macro. Signed-off-by: Arnd Bergmann Fixes: e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers") Signed-off-by: Jon Mason

NTB: unify translation addresses

2015-11-08T21:11:21Z

There is no need for the upstream and downstream addresses to be different for the NTB configs. Go to using a single set of address. It is still possible to configure them differently using module parameter override however. Signed-off-by: Dave Jiang Acked and Tested-by: Allen Hubbe Signed-off-by: Jon Mason

NTB: invalid buf pointer in multi-MW setups

2015-11-08T21:11:21Z

Order of operations issue with the QP Num and MW count, which would result in the receive buffer pointer being invalid if there are more than 1 MW. Corrected with parenthesis to enforce the proper order of operations. Reported-by: John I. Kading Signed-off-by: Jon Mason

NTB: remove unused variable

2015-11-08T21:11:21Z

These variables were not used anywhere. So remove them. Signed-off-by: Sudip Mukherjee Signed-off-by: Jon Mason