i40e: add mask to apply valid bits for itr_idx

JIRA: https://issues.redhat.com/browse/RHEL-123809

commit eac0442
Author: Lukasz Czapnik <lukasz.czapnik@intel.com>
Date:   Wed Aug 13 12:45:17 2025 +0200

    i40e: add mask to apply valid bits for itr_idx

    The ITR index (itr_idx) is only 2 bits wide. When constructing the
    register value for QINT_RQCTL, all fields are ORed together. Without
    masking, higher bits from itr_idx may overwrite adjacent fields in the
    register.

    Apply I40E_QINT_RQCTL_ITR_INDX_MASK to ensure only the intended bits are
    set.

    Fixes: 5c3c48a ("i40e: implement virtual device interface")
    Cc: stable@vger.kernel.org
    Signed-off-by: Lukasz Czapnik <lukasz.czapnik@intel.com>
    Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
    Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>

Author: michich

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -448,7 +448,7 @@ static void i40e_config_irq_link_list(struct i40e_vf *vf, u16 vsi_id,
 		    (qtype << I40E_QINT_RQCTL_NEXTQ_TYPE_SHIFT) |
 		    (pf_queue_id << I40E_QINT_RQCTL_NEXTQ_INDX_SHIFT) |
 		    BIT(I40E_QINT_RQCTL_CAUSE_ENA_SHIFT) |
-		    (itr_idx << I40E_QINT_RQCTL_ITR_INDX_SHIFT);
+		    FIELD_PREP(I40E_QINT_RQCTL_ITR_INDX_MASK, itr_idx);
 		wr32(hw, reg_idx, reg);
 	}