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lib/iscsi: Unify array size and used count in SGL operation

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This patch adopts the good practice in DIF library, and unifies
array size and used count into unused count.

Change-Id: Ifde15d1fa66dbd2578da771b5500e45a84664f63
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/455475
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Shuhei Matsumoto 2019-05-21 16:15:31 +09:00 committed by Jim Harris
parent 92cafd1586
commit 5ef1a15c6f
2 changed files with 15 additions and 15 deletions
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28
lib/iscsi/iscsi.c
View File

@ -590,20 +590,18 @@ spdk_iscsi_read_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu **_pdu)
struct _iov_ctx {
struct iovec *iov;
int num_iovs;
uint32_t iov_offset;
int iovcnt;
uint32_t iov_offset;
uint32_t mapped_len;
};
static inline void
_iov_ctx_init(struct _iov_ctx *ctx, struct iovec *iovs, int num_iovs,
_iov_ctx_init(struct _iov_ctx *ctx, struct iovec *iovs, int iovcnt,
uint32_t iov_offset)
{
ctx->iov = iovs;
ctx->num_iovs = num_iovs;
ctx->iovcnt = iovcnt;
ctx->iov_offset = iov_offset;
ctx->iovcnt = 0;
ctx->mapped_len = 0;
}
@ -613,13 +611,14 @@ _iov_ctx_set_iov(struct _iov_ctx *ctx, uint8_t *data, uint32_t data_len)
if (ctx->iov_offset >= data_len) {
ctx->iov_offset -= data_len;
} else {
assert(ctx->iovcnt > 0);
ctx->iov->iov_base = data + ctx->iov_offset;
ctx->iov->iov_len = data_len - ctx->iov_offset;
ctx->mapped_len += data_len - ctx->iov_offset;
ctx->iov_offset = 0;
ctx->iov++;
ctx->iovcnt++;
if (ctx->iovcnt == ctx->num_iovs) {
ctx->iovcnt--;
if (ctx->iovcnt == 0) {
return false;
}
}
@ -644,7 +643,7 @@ _iov_ctx_set_md_interleave_iov(struct _iov_ctx *ctx,
} else {
buf_iov.iov_base = buf;
buf_iov.iov_len = buf_len;
rc = spdk_dif_set_md_interleave_iovs(ctx->iov, ctx->num_iovs - ctx->iovcnt,
rc = spdk_dif_set_md_interleave_iovs(ctx->iov, ctx->iovcnt,
&buf_iov, 1,
ctx->iov_offset, data_len, &mapped_len,
dif_ctx);
@ -655,9 +654,10 @@ _iov_ctx_set_md_interleave_iov(struct _iov_ctx *ctx,
ctx->mapped_len += mapped_len;
ctx->iov_offset = 0;
ctx->iovcnt += rc;
assert(ctx->iovcnt >= rc);
ctx->iovcnt -= rc;
if (ctx->iovcnt == ctx->num_iovs) {
if (ctx->iovcnt == 0) {
return false;
}
}
@ -666,7 +666,7 @@ _iov_ctx_set_md_interleave_iov(struct _iov_ctx *ctx,
}
int
spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int num_iovs,
spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int iovcnt,
struct spdk_iscsi_pdu *pdu, uint32_t *_mapped_length)
{
struct _iov_ctx ctx;
@ -674,7 +674,7 @@ spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int num_
uint32_t total_ahs_len;
uint32_t data_len;
if (num_iovs == 0) {
if (iovcnt == 0) {
return 0;
}
@ -688,7 +688,7 @@ spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int num_
enable_digest = 0;
}
_iov_ctx_init(&ctx, iovs, num_iovs, pdu->writev_offset);
_iov_ctx_init(&ctx, iovs, iovcnt, pdu->writev_offset);
/* BHS */
if (!_iov_ctx_set_iov(&ctx, (uint8_t *)&pdu->bhs, ISCSI_BHS_LEN)) {
@ -732,7 +732,7 @@ end:
*_mapped_length = ctx.mapped_len;
}
return ctx.iovcnt;
return iovcnt - ctx.iovcnt;
}
static int

2
lib/iscsi/iscsi.h
View File

@ -407,7 +407,7 @@ void spdk_iscsi_send_nopin(struct spdk_iscsi_conn *conn);
void spdk_iscsi_task_response(struct spdk_iscsi_conn *conn,
struct spdk_iscsi_task *task);
int spdk_iscsi_execute(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu);
int spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int num_iovs,
int spdk_iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int iovcnt,
struct spdk_iscsi_pdu *pdu, uint32_t *mapped_length);
int spdk_iscsi_read_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu **_pdu);
bool spdk_iscsi_get_dif_ctx(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu,