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Deprecation

ABI and API Deprecation

This document details the policy for maintaining stability of SPDK ABI and API.

Major ABI version can change at most once for each SPDK release. ABI versions are managed separately for each library and follow Semantic Versioning.

API and ABI deprecation notices shall be posted in the next section. Each entry must describe what will be removed and can suggest the future use or alternative. Specific future SPDK release for the removal must be provided. ABI cannot be removed without providing deprecation notice for at least single SPDK release.

Deprecated code paths must be registered with SPDK_LOG_DEPRECATION_REGISTER() and logged with SPDK_LOG_DEPRECATED(). The tag used with these macros will appear in the SPDK log at the warn level when SPDK_LOG_DEPRECATED() is called, subject to rate limits. The tags can be matched with the level 4 headers below.

Deprecation Notices

nvme

spdk_nvme_accel_fn_table.submit_accel_crc32c

This callback is now deprecated and will be removed in the v25.01 release. Please use the append API (append_crc32c, finish_sequence, reverse_sequence, abort_sequence) instead.

multipath_config failover_config

All controllers created with the same name shall be configured either for multipath or for failover. Otherwise we have configuration mismatch. Currently, using bdev_nvme_attach_controller RPC call, it is possible to create multiple controllers with the same name but different '-x' options. Starting from 25.01 we are going to perform controller configuration consistency check, and all controllers created with the same name will be forced to have consistent setting, either '-x multipath' or '-x failover'. No mixing of '-x' options will be allowed. Please also note there is planned default mode change in SPDK release 25.01: if no '-x' option will be specified in bdev_nvme_attach_controller RPC call, the multipath mode will be assigned as a default.

gpt

old_gpt_guid

Deprecated the SPDK partition type GUID 7c5222bd-8f5d-4087-9c00-bf9843c7b58c. Partitions of this type have bdevs created that are one block less than the actual size of the partition. Existing partitions using the deprecated GUID can continue to use that GUID; support for the deprecated GUID will remain in SPDK indefinitely, and will continue to exhibit the off-by-one bug so that on-disk metadata layouts based on the incorrect size are not affected.

See GitHub issue 2801 for additional details on the bug.

New SPDK partition types should use GUID 6527994e-2c5a-4eec-9613-8f5944074e8b which will create a bdev of the correct size.

rpc

spdk_rpc_listen spdk_rpc_accept spdk_rpc_close

These functions are deprecated and will be removed in 24.09 release. Please use spdk_rpc_server_listen, spdk_rpc_server_accept and spdk_rpc_server_close instead.

env

spdk_env_get_socket_id, spdk_pci_device_get_socket_id

These functions are deprecated and will be removed in 25.05 release. Please use spdk_env_get_numa_id and spdk_pci_device_get_numa_id instead.