C++ (Cpp) iscsi_prep_data_out_pduの例

コード例 #1

ファイル: iscsi_iser.c プロジェクト: 513855417/linux

static int
iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
				 struct iscsi_task *task)
{
	struct iscsi_r2t_info *r2t = &task->unsol_r2t;
	struct iscsi_data hdr;
	int error = 0;

	/* Send data-out PDUs while there's still unsolicited data to send */
	while (iscsi_task_has_unsol_data(task)) {
		iscsi_prep_data_out_pdu(task, r2t, &hdr);
		iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
			   hdr.itt, r2t->data_count);

		/* the buffer description has been passed with the command */
		/* Send the command */
		error = iser_send_data_out(conn, task, &hdr);
		if (error) {
			r2t->datasn--;
			goto iscsi_iser_task_xmit_unsol_data_exit;
		}
		r2t->sent += r2t->data_count;
		iser_dbg("Need to send %d more as data-out PDUs\n",
			   r2t->data_length - r2t->sent);
	}

iscsi_iser_task_xmit_unsol_data_exit:
	return error;
}

コード例 #2

static int
iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
				 struct iscsi_task *task)
{
	struct iscsi_r2t_info *r2t = &task->unsol_r2t;
	struct iscsi_data hdr;
	int error = 0;

	
	while (iscsi_task_has_unsol_data(task)) {
		iscsi_prep_data_out_pdu(task, r2t, &hdr);
		iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
			   hdr.itt, r2t->data_count);

		
		
		error = iser_send_data_out(conn, task, &hdr);
		if (error) {
			r2t->datasn--;
			goto iscsi_iser_task_xmit_unsol_data_exit;
		}
		r2t->sent += r2t->data_count;
		iser_dbg("Need to send %d more as data-out PDUs\n",
			   r2t->data_length - r2t->sent);
	}

iscsi_iser_task_xmit_unsol_data_exit:
	return error;
}

コード例 #3

ファイル: libiscsi_tcp.c プロジェクト: kprog/linux

/**
 * iscsi_tcp_task_xmit - xmit normal PDU task
 * @task: iscsi command task
 *
 * We're expected to return 0 when everything was transmitted successfully,
 * -EAGAIN if there's still data in the queue, or != 0 for any other kind
 * of error.
 */
int iscsi_tcp_task_xmit(struct iscsi_task *task)
{
	struct iscsi_conn *conn = task->conn;
	struct iscsi_session *session = conn->session;
	struct iscsi_r2t_info *r2t;
	int rc = 0;

flush:
	/* Flush any pending data first. */
	rc = session->tt->xmit_pdu(task);
	if (rc < 0)
		return rc;

	/* mgmt command */
	if (!task->sc) {
		if (task->hdr->itt == RESERVED_ITT)
			iscsi_put_task(task);
		return 0;
	}

	/* Are we done already? */
	if (task->sc->sc_data_direction != DMA_TO_DEVICE)
		return 0;

	r2t = iscsi_tcp_get_curr_r2t(task);
	if (r2t == NULL) {
		/* Waiting for more R2Ts to arrive. */
		ISCSI_DBG_TCP(conn, "no R2Ts yet\n");
		return 0;
	}

	rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT);
	if (rc)
		return rc;
	iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr);

	ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
		      r2t, r2t->datasn - 1, task->hdr->itt,
		      r2t->data_offset + r2t->sent, r2t->data_count);

	rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
					 r2t->data_count);
	if (rc) {
		iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED);
		return rc;
	}

	r2t->sent += r2t->data_count;
	goto flush;
}