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target/sbc: Add sbc_dif_generate software emulation

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This patch adds WRITE_INSERT emulation within target-core
using TYPE1 / TYPE3 PI modes in sbc_dif_generate() code.

This is useful in order for existing legacy fabrics that do not
support protection offloads to interact with backend devices that
currently have T10 PI enabled.

v2 changes:
   - Rename to sbc_dif_generate() (Sagi)

Cc: Martin K. Petersen <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Or Gerlitz <[email protected]>
Cc: Quinn Tran <[email protected]>
Cc: Giridhar Malavali <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2014-04-02 14:19:09 -07:00
commit 66a3d5bc47
2 changed files with 45 additions and 0 deletions
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1
include/target/target_core_backend.h
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@ -73,6 +73,7 @@ sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
sector_t lba, sector_t nolb),
void *priv);
void sbc_dif_generate(struct se_cmd *);
sense_reason_t sbc_dif_verify_write(struct se_cmd *, sector_t, unsigned int,
unsigned int, struct scatterlist *, int);
sense_reason_t sbc_dif_verify_read(struct se_cmd *, sector_t, unsigned int,