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igb: Map entire page and sync half instead of mapping and unmapping half pages

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This change makes it so that we map the entire page and just sync half of
it for the device at a time.  The advantage to this approach is that we can
avoid the locking on map/unmap seen in many IOMMU implementations.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck
2012-09-25 00:31:02 +00:00
committed by Jeff Kirsher
parent db2ee5bdf5
commit cbc8e55f6f
3 changed files with 180 additions and 56 deletions
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drivers/net/ethernet/intel/igb/igb.h
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@@ -239,6 +239,7 @@ struct igb_ring {
/* everything past this point are written often */
u16 next_to_clean ____cacheline_aligned_in_smp;
u16 next_to_use;
u16 next_to_alloc;
union {
/* TX */