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To read from a region, user space must currently request a new snapshot of the region and then read from that snapshot. This can sometimes be overkill if user space only reads a tiny portion. They first create the snapshot, then request a read, then destroy the snapshot. For regions which have a single underlying "contents", it makes sense to allow supporting direct reading of the region data. Extend the DEVLINK_CMD_REGION_READ to allow direct reading from a region if requested via the new DEVLINK_ATTR_REGION_DIRECT. If this attribute is set, then perform a direct read instead of using a snapshot. Direct read is mutually exclusive with DEVLINK_ATTR_REGION_SNAPSHOT_ID, and care is taken to ensure that we reject commands which provide incorrect attributes. Regions must enable support for direct read by implementing the .read() callback function. If a region does not support such direct reads, a suitable extended error message is reported. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| .. | ||
| am65-nuss-cpsw-switch.rst | ||
| bnxt.rst | ||
| devlink-dpipe.rst | ||
| devlink-flash.rst | ||
| devlink-health.rst | ||
| devlink-info.rst | ||
| devlink-linecard.rst | ||
| devlink-params.rst | ||
| devlink-port.rst | ||
| devlink-region.rst | ||
| devlink-reload.rst | ||
| devlink-resource.rst | ||
| devlink-selftests.rst | ||
| devlink-trap.rst | ||
| hns3.rst | ||
| ice.rst | ||
| index.rst | ||
| ionic.rst | ||
| iosm.rst | ||
| mlx4.rst | ||
| mlx5.rst | ||
| mlxsw.rst | ||
| mv88e6xxx.rst | ||
| netdevsim.rst | ||
| nfp.rst | ||
| octeontx2.rst | ||
| prestera.rst | ||
| qed.rst | ||
| ti-cpsw-switch.rst | ||