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dif: Add an API to update data offset of DIF context

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To process unaligned data segment properly when a whole data buffer
is splitted into multiple data segments and each data segment has
any alignment, we have to update only data offset of DIF context
according to the progress.

Hence this patch adds an new API spdk_dif_ctx_set_data_offset().
The API will be used in the next patch.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I346ab583518b80792ea40d34cf0c8536ecc3d904
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/458141
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
This commit is contained in:
Shuhei Matsumoto 2019-06-15 09:09:05 +09:00 committed by Changpeng Liu
parent 5ef24d5256
commit 2819718176
2 changed files with 27 additions and 0 deletions
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11
include/spdk/dif.h
View File

@ -74,6 +74,9 @@ struct spdk_dif_ctx {
/** Metadata size */
uint32_t md_size;
/** Metadata location */
bool md_interleave;
/** Interval for guard computation for DIF */
uint32_t guard_interval;
@ -150,6 +153,14 @@ int spdk_dif_ctx_init(struct spdk_dif_ctx *ctx, uint32_t block_size, uint32_t md
uint32_t init_ref_tag, uint16_t apptag_mask, uint16_t app_tag,
uint32_t data_offset, uint16_t guard_seed);
/**
* Update date offset of DIF context.
*
* \param ctx DIF context.
* \param data_offset Byte offset from the start of the whole data buffer.
*/
void spdk_dif_ctx_set_data_offset(struct spdk_dif_ctx *ctx, uint32_t data_offset);
/**
* Generate DIF for extended LBA payload.
*

16
lib/util/dif.c
View File

@ -250,6 +250,7 @@ spdk_dif_ctx_init(struct spdk_dif_ctx *ctx, uint32_t block_size, uint32_t md_siz
ctx->block_size = block_size;
ctx->md_size = md_size;
ctx->md_interleave = md_interleave;
ctx->guard_interval = _get_guard_interval(block_size, md_size, dif_loc, md_interleave);
ctx->dif_type = dif_type;
ctx->dif_flags = dif_flags;
@ -264,6 +265,21 @@ spdk_dif_ctx_init(struct spdk_dif_ctx *ctx, uint32_t block_size, uint32_t md_siz
return 0;
}
void
spdk_dif_ctx_set_data_offset(struct spdk_dif_ctx *ctx, uint32_t data_offset)
{
uint32_t data_block_size;
if (ctx->md_interleave) {
data_block_size = ctx->block_size - ctx->md_size;
} else {
data_block_size = ctx->block_size;
}
ctx->data_offset = data_offset;
ctx->ref_tag_offset = data_offset / data_block_size;
}
static void
_dif_generate(void *_dif, uint16_t guard, uint32_t offset_blocks,
const struct spdk_dif_ctx *ctx)