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App allocated QPs can use a separate doorbell for each QP. This doorbell region can be passed through a new driver specific DBR_HANDLE attribute, during QP creation. When this attribute is set, associate the QP with the given doorbell region. While the QP holds a reference to the dbr, the dbr itself cannot be destroyed and is rejected with EBUSY error. Link: https://patch.msgid.link/r/20260519150041.7251-9-sriharsha.basavapatna@broadcom.com Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com> Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>