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[SCSI] iscsi: Some fixes in preparation for bidirectional support - total_length 

- Remove shadow of request length from struct iscsi_cmd_task.
- change all users to use scsi_cmnd->request_bufflen directly

(With bidi we will use scsi-ml API to retrieve in/out length)

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2007-05-30 12:57:15 -05:00 committed by James Bottomley
parent d473cc7f15
commit 857ae0bdb7
4 changed files with 28 additions and 27 deletions
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4
drivers/infiniband/ulp/iser/iscsi_iser.c
View File

@ -140,10 +140,10 @@ iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
iser_ctask->iser_conn = iser_conn;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
BUG_ON(ctask->total_length == 0);
BUG_ON(sc->request_bufflen == 0);
debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
ctask->itt, ctask->total_length, ctask->imm_count,
ctask->itt, sc->request_bufflen, ctask->imm_count,
ctask->unsol_count);
}

21
drivers/scsi/iscsi_tcp.c
View File

@ -216,6 +216,7 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
struct iscsi_session *session = conn->session;
struct scsi_cmnd *sc = ctask->sc;
int datasn = be32_to_cpu(rhdr->datasn);
rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
@ -238,12 +239,14 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
tcp_ctask->exp_datasn++;
tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) {
debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
__FUNCTION__, tcp_ctask->data_offset,
tcp_conn->in.datalen, sc->request_bufflen);
return ISCSI_ERR_DATA_OFFSET;
}
if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
struct scsi_cmnd *sc = ctask->sc;
conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
int res_count = be32_to_cpu(rhdr->residual_count);
@ -405,11 +408,11 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
r2t->data_length, session->max_burst);
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
if (r2t->data_offset + r2t->data_length > ctask->total_length) {
if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) {
spin_unlock(&session->lock);
printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
"offset %u and total length %d\n", r2t->data_length,
r2t->data_offset, ctask->total_length);
r2t->data_offset, ctask->sc->request_bufflen);
return ISCSI_ERR_DATALEN;
}
@ -604,7 +607,7 @@ iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
{
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
int buf_left = buf_size - (tcp_conn->data_copied + offset);
int size = min(tcp_conn->in.copy, buf_left);
unsigned size = min(tcp_conn->in.copy, buf_left);
int rc;
size = min(size, ctask->data_count);
@ -613,7 +616,7 @@ iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
size, tcp_conn->in.offset, tcp_conn->in.copied);
BUG_ON(size <= 0);
BUG_ON(tcp_ctask->sent + size > ctask->total_length);
BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen);
rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
(char*)buf + (offset + tcp_conn->data_copied), size);
@ -1292,7 +1295,7 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
if (sc->sc_data_direction == DMA_TO_DEVICE) {
tcp_ctask->xmstate = XMSTATE_W_HDR;
BUG_ON(ctask->total_length == 0);
BUG_ON(sc->request_bufflen == 0);
if (sc->use_sg) {
struct scatterlist *sg = sc->request_buffer;
@ -1309,7 +1312,7 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
}
debug_scsi("cmd [itt 0x%x total %d imm_data %d "
"unsol count %d, unsol offset %d]\n",
ctask->itt, ctask->total_length, ctask->imm_count,
ctask->itt, sc->request_bufflen, ctask->imm_count,
ctask->unsol_count, ctask->unsol_offset);
} else
tcp_ctask->xmstate = XMSTATE_R_HDR;

9
drivers/scsi/libiscsi.c
View File

@ -147,19 +147,19 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
ctask->unsol_datasn = 0;
if (session->imm_data_en) {
if (ctask->total_length >= session->first_burst)
if (sc->request_bufflen >= session->first_burst)
ctask->imm_count = min(session->first_burst,
conn->max_xmit_dlength);
else
ctask->imm_count = min(ctask->total_length,
ctask->imm_count = min(sc->request_bufflen,
conn->max_xmit_dlength);
hton24(ctask->hdr->dlength, ctask->imm_count);
} else
zero_data(ctask->hdr->dlength);
if (!session->initial_r2t_en) {
ctask->unsol_count = min(session->first_burst,
ctask->total_length) - ctask->imm_count;
ctask->unsol_count = min((session->first_burst),
(sc->request_bufflen)) - ctask->imm_count;
ctask->unsol_offset = ctask->imm_count;
}
@ -815,7 +815,6 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
ctask->conn = conn;
ctask->sc = sc;
INIT_LIST_HEAD(&ctask->running);
ctask->total_length = sc->request_bufflen;
iscsi_prep_scsi_cmd_pdu(ctask);
session->tt->init_cmd_task(ctask);

21
include/scsi/libiscsi.h
View File

@ -80,7 +80,7 @@ struct iscsi_mgmt_task {
*/
struct iscsi_hdr *hdr;
char *data; /* mgmt payload */
int data_count; /* counts data to be sent */
unsigned data_count; /* counts data to be sent */
uint32_t itt; /* this ITT */
void *dd_data; /* driver/transport data */
struct list_head running;
@ -101,13 +101,12 @@ struct iscsi_cmd_task {
int itt; /* this ITT */
uint32_t unsol_datasn;
int imm_count; /* imm-data (bytes) */
int unsol_count; /* unsolicited (bytes)*/
unsigned imm_count; /* imm-data (bytes) */
unsigned unsol_count; /* unsolicited (bytes)*/
/* offset in unsolicited stream (bytes); */
int unsol_offset;
int data_count; /* remaining Data-Out */
unsigned unsol_offset;
unsigned data_count; /* remaining Data-Out */
struct scsi_cmnd *sc; /* associated SCSI cmd*/
int total_length;
struct iscsi_conn *conn; /* used connection */
struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
@ -173,8 +172,8 @@ struct iscsi_conn {
int tmabort_state; /* see TMABORT_INITIAL, etc.*/
/* negotiated params */
int max_recv_dlength; /* initiator_max_recv_dsl*/
int max_xmit_dlength; /* target_max_recv_dsl */
unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
unsigned max_xmit_dlength; /* target_max_recv_dsl */
int hdrdgst_en;
int datadgst_en;
int ifmarker_en;
@ -212,10 +211,10 @@ struct iscsi_session {
/* configuration */
int initial_r2t_en;
int max_r2t;
unsigned max_r2t;
int imm_data_en;
int first_burst;
int max_burst;
unsigned first_burst;
unsigned max_burst;
int time2wait;
int time2retain;
int pdu_inorder_en;