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The implementation of some features cannot always be done generically by the target core code. Arbitraion and IRQ coalescing features are examples of such features: their implementation must be provided (at least partially) by the target controller driver. Introduce the set_feature() and get_feature() controller fabrics operations (in struct nvmet_fabrics_ops) to allow supporting such features. Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Rick Wertenbroek <rick.wertenbroek@gmail.com> Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Keith Busch <kbusch@kernel.org>