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

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This patch fixes handling of expected datasn/r2tsn as received from
target. It is done according to: T10 rfc3720 section 3.2.2.3. Data Sequencing.

. unify expected datasn/r2tsn into one counter
. calculate than check expected datasn/r2tsn. On error print a message
  and fail the request. (TODO use iscsi retransmits)
. remove the FIXME   ;)
. avoid zero length memset

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>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2007-05-30 12:57:14 -05:00 • committed by James Bottomley
parent 8ad5781ae9
commit d473cc7f15
4 changed files with 15 additions and 11 deletions
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5
drivers/scsi/libiscsi.c
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@ -120,7 +120,9 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
session->cmdsn++;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
if (sc->cmd_len < MAX_COMMAND_SIZE)
memset(&hdr->cdb[sc->cmd_len], 0,
MAX_COMMAND_SIZE - sc->cmd_len);
ctask->data_count = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
@ -165,7 +167,6 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
/* No unsolicit Data-Out's */
ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
} else {
ctask->datasn = 0;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
zero_data(hdr->dlength);