Spdk/include/spdk/dif.h

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#ifndef SPDK_DIF_H
#define SPDK_DIF_H

#include "spdk/stdinc.h"
#include "spdk/assert.h"

#define SPDK_DIF_REFTAG_CHECK	(1U << 26)
#define SPDK_DIF_APPTAG_CHECK	(1U << 27)
#define SPDK_DIF_GUARD_CHECK	(1U << 28)

enum spdk_dif_type {
	SPDK_DIF_TYPE1 = 1,
	SPDK_DIF_TYPE2,
	SPDK_DIF_TYPE3,
};

struct spdk_dif {
	uint16_t guard;
	uint16_t app_tag;
	uint32_t ref_tag;
};
SPDK_STATIC_ASSERT(sizeof(struct spdk_dif) == 8, "Incorrect size");

/**
 * Generate DIF for extended LBA payload.
 *
 * \param iovs iovec array describing the extended LBA payload.
 * \param iovcnt Number of elements in the iovec array.
 * \param block_size Block size in a block.
 * \param md_size Metadata size in a block.
 * \param num_blocks Number of blocks of the payload.
 * \param dif_loc DIF location. If true, DIF is set in the last 8 bytes of metadata.
 * If false, DIF is in the first 8 bytes of metadata.
 * \param dif_type Type of DIF.
 * \param dif_flags Flag to specify the DIF action.
 * \param init_ref_tag Initial Reference Tag. For type 1, this is the
 * starting block address.
 * \param app_tag Application Tag.
 *
 * \return 0 on success and negated errno otherwise.
 */
int spdk_dif_generate(struct iovec *iovs, int iovcnt,
		      uint32_t block_size, uint32_t md_size, uint32_t num_blocks,
		      bool dif_loc, enum spdk_dif_type dif_type, uint32_t dif_flags,
		      uint32_t init_ref_tag, uint16_t app_tag);

/**
 * Verify DIF for extended LBA payload.
 *
 * \param iovs iovec array describing the extended LBA payload.
 * \param iovcnt Number of elements in the iovec array.
 * \param block_size Block size in a block.
 * \param md_size Metadata size in a block.
 * \param num_blocks Number of blocks of the payload.
 * \param dif_loc DIF location. If true, DIF is set in the last 8 bytes of metadata.
 * If false, DIF is set in the first 8 bytes of metadata.
 * \param dif_type Type of DIF.
 * \param dif_flags Flag to specify the DIF action.
 * \param init_ref_tag Initial Reference Tag. For type 1, this is the
 * starting block address.
 * \param apptag_mask Application Tag Mask.
 * \param app_tag Application Tag.
 *
 * \return 0 on success and negated errno otherwise.
 */
int spdk_dif_verify(struct iovec *iovs, int iovcnt,
		    uint32_t block_size, uint32_t md_size, uint32_t num_blocks,
		    bool dif_loc, enum spdk_dif_type dif_type, uint32_t dif_flags,
		    uint32_t init_ref_tag, uint16_t apptag_mask, uint16_t app_tag);
#endif /* SPDK_DIF_H */