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bnxt_re/lib: Track and maintain CQ doorbell epoch during CQ resize
[ Upstream commit 2bc950a ] During CQ resize, it is expected that the CQ doorbell 'epoch' needs to be maintained when switching from the old CQ to the new resized CQ. On the first CQ doorbell excecuted on the new CQ, we need to check if the index we are writing is less than the last index written for the old CQ. If that is the case, we need to flip the 'epoch' so the ASIC does not get confused and thinks the CQ doorbell is out of order and therefore drops the doorbell. Note the logic in the ASIC that checks CQ doorbell ordering is not aware of the CQ resize. Fixes: 4a85843 ("bnxt_re/lib: Fix the toggle bit changes in resize cq path") Signed-off-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Chandramohan Akula <chandramohan.akula@broadcom.com> Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Nicolas Morey <nmorey@suse.com>
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