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[SCSI] libiscsi: prepare libiscsi for new offload engines by modifying unsol data code

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cxgb3i offloads data transfers. It does not offload the entire scsi/iscsi
procssing like qla4xxx and it does not offload the iscsi sequence
processing like how bnx2i does. cxgb3i relies on iscsi_tcp for the
seqeunce handling so this changes how we transfer unsolicitied data by
adding a common r2t struct and helpers.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie 2008-12-02 00:32:05 -06:00 • committed by James Bottomley
parent 63c62f1cb9
commit 577577da6d
3 changed files with 156 additions and 70 deletions
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34
include/scsi/libiscsi.h
View file

@ -93,24 +93,38 @@ enum {
ISCSI_TASK_RUNNING,
};
struct iscsi_r2t_info {
__be32 ttt; /* copied from R2T */
__be32 exp_statsn; /* copied from R2T */
uint32_t data_length; /* copied from R2T */
uint32_t data_offset; /* copied from R2T */
int data_count; /* DATA-Out payload progress */
int datasn;
/* LLDs should set/update these values */
int sent; /* R2T sequence progress */
};
struct iscsi_task {
/*
* Because LLDs allocate their hdr differently, this is a pointer
* and length to that storage. It must be setup at session
* creation time.
*/
struct iscsi_cmd *hdr;
struct iscsi_hdr *hdr;
unsigned short hdr_max;
unsigned short hdr_len; /* accumulated size of hdr used */
/* copied values in case we need to send tmfs */
itt_t hdr_itt;
__be32 cmdsn;
uint8_t lun[8];
int itt; /* this ITT */
uint32_t unsol_datasn;
unsigned imm_count; /* imm-data (bytes) */
unsigned unsol_count; /* unsolicited (bytes)*/
/* offset in unsolicited stream (bytes); */
unsigned unsol_offset;
unsigned data_count; /* remaining Data-Out */
struct iscsi_r2t_info unsol_r2t;
char *data; /* mgmt payload */
unsigned data_count;
struct scsi_cmnd *sc; /* associated SCSI cmd*/
struct iscsi_conn *conn; /* used connection */
@ -121,6 +135,11 @@ struct iscsi_task {
void *dd_data; /* driver/transport data */
};
static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
{
return task->unsol_r2t.data_length > task->unsol_r2t.sent;
}
static inline void* iscsi_next_hdr(struct iscsi_task *task)
{
return (void*)task->hdr + task->hdr_len;
@ -376,8 +395,9 @@ extern void iscsi_suspend_tx(struct iscsi_conn *conn);
* pdu and task processing
*/
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *,
struct iscsi_data *hdr);
extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
struct iscsi_r2t_info *r2t,
struct iscsi_data *hdr);
extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
char *, uint32_t);
extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,