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nvmet: Implement arbitration feature support

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NVMe base specification v2.1 mandates support for the arbitration
feature (NVME_FEAT_ARBITRATION). Introduce the data structure
struct nvmet_feat_arbitration to define the high, medium and low
priority weight fields and the arbitration burst field of this feature
and implement the functions nvmet_get_feat_arbitration() and
nvmet_set_feat_arbitration() functions to get and set these fields.

Since there is no generic way to implement support for the arbitration
feature, these functions respectively use the controller get_feature()
and set_feature() operations to process the feature with the help of
the controller driver. If the controller driver does not implement these
operations and a get feature command or a set feature command for this
feature is received, the command is failed with an invalid field error.

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>
This commit is contained in:
Damien Le Moal
2025-01-04 13:59:49 +09:00
committed by Keith Busch
parent f1ecd491b6
commit a0ed77d4c9
2 changed files with 56 additions and 2 deletions
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7
drivers/nvme/target/nvmet.h
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@@ -921,4 +921,11 @@ struct nvmet_feat_irq_config {
bool cd;
};
struct nvmet_feat_arbitration {
u8 hpw;
u8 mpw;
u8 lpw;
u8 ab;
};
#endif /* _NVMET_H */