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The NVMe base specifications v2.1 mandate Supporting the interrupt coalescing feature (NVME_FEAT_IRQ_COALESCE) for PCI controllers. Introduce the data structure struct nvmet_feat_irq_coalesce to define the time and threshold (thr) fields of this feature and implement the functions nvmet_get_feat_irq_coalesce() and nvmet_set_feat_irq_coalesce() to get and set this feature. These functions respectively use the controller get_feature() and set_feature() operations to fill and handle the fields of struct nvmet_feat_irq_coalesce. While the Linux kernel nvme driver does not use this feature and thus will not complain if it is not implemented, other major OSes fail initializing the NVMe device if this feature support is missing. Support for this feature is prohibited for fabrics controllers. If a get feature or set feature command for this feature is received for a fabrics controller, the command is failed with an invalid field error. Suggested-by: Rick Wertenbroek <rick.wertenbroek@gmail.com> 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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.