ice: track interrupt vectors with xarray

Replace custom interrupt tracker with generic xarray data structure.
Remove all code responsible for searching for a new entry with xa_alloc,
which always tries to allocate at the lowes possible index. As a result
driver is always using a contiguous region of the MSIX vector table.

New tracker keeps ice_irq_entry entries in xarray as opaque for the rest
of the driver hiding the entry details from the caller.

Reviewed-by: Jacob Keller <[email protected]>
Reviewed-by: Michal Swiatkowski <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Tested-by: Pucha Himasekhar Reddy <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Piotr Raczynski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_irq.h b/drivers/net/ethernet/intel/ice/ice_irq.h
index 26e80dfe22b5..da5cdb1f0d3a 100644
--- a/drivers/net/ethernet/intel/ice/ice_irq.h
+++ b/drivers/net/ethernet/intel/ice/ice_irq.h
@@ -4,6 +4,15 @@
 #ifndef _ICE_IRQ_H_
 #define _ICE_IRQ_H_
 
+struct ice_irq_entry {
+	unsigned int index;
+};
+
+struct ice_irq_tracker {
+	struct xarray entries;
+	u16 num_entries;	/* total vectors available */
+};
+
 int ice_init_interrupt_scheme(struct ice_pf *pf);
 void ice_clear_interrupt_scheme(struct ice_pf *pf);