Commit Graph

5 Commits

Author SHA1 Message Date
Mike Marciniszyn bb77a07723 IB/qib: Optimize pio ack buffer allocation
This patch optimizes pio buffer allocation in the kernel.

For qib, kernel pio buffers are used for sending acks.  The code to
allocate the buffer would always start at 0 until it found a buffer.

This means that an average of 64 comparisions were done on each
allocate, since the busy bit won't be cleared until the bits are
refreshed when buffers are exhausted.

This patch adds two new fields in the devdata struct, last_pio and
min_kernel_pio.  last_pio is the last buffer that was allocated.
min_kernel_pio is the lowest potential available buffer.

min_kernel_pio is modifed as contexts are allocated and deallocted.

Reviewed-by: Ramkrishna Vepa <ramkrishna.vepa@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2012-05-14 12:37:03 -07:00
Paul Gortmaker fec14d2fce infiniband: add moduleparam.h to drivers/infiniband as required
These files were getting the moduleparam infrastructure from the
implicit presence of module.h being everywhere, but that is going
away soon.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:36 -04:00
Ralph Campbell cc323b2aaa IB/qib: Avoid variable-length array
Rather than use a variable size array allocation on the stack,
define a constant for the maximum array size possible.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-07-19 13:21:24 -07:00
Dave Olson fce24a9d28 IB/qib: Don't mark VL15 bufs as WC to avoid a rare 7322 chip problem
Don't set write combining via PAT on the VL15 buffers to avoid a rare
problem with unaligned writes from interrupt-flushed store buffers.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-07-06 14:13:20 -07:00
Ralph Campbell f931551baf IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters
Add a low-level IB driver for QLogic PCIe adapters.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-05-23 21:44:54 -07:00