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IB/ipath: Enable reduced PIO update for HCAs that support it.

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Newer HCAs have a threshold counter to reduce the number of DMAs the
chip makes to update the PIO buffer availability status bits.  This
patch enables the feature.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Dave Olson
2008-04-16 21:09:30 -07:00
committed by Roland Dreier
parent 0ab6b2b9ab
commit 1d7c2e529f
3 changed files with 45 additions and 1 deletions
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1
drivers/infiniband/hw/ipath/ipath_kernel.h
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@@ -349,6 +349,7 @@ struct ipath_devdata {
u32 ipath_lastrpkts;
/* pio bufs allocated per port */
u32 ipath_pbufsport;
u32 ipath_pioupd_thresh; /* update threshold, some chips */
/*
* number of ports configured as max; zero is set to number chip
* supports, less gives more pio bufs/port, etc.