C++ (Cpp) iser_prepare_read_cmd Examples

Example #1

File: iser_initiator.c Project: bond-os/linux

/**
 * iser_send_command - send command PDU
 */
int iser_send_command(struct iscsi_conn *conn,
		      struct iscsi_task *task)
{
	struct iscsi_iser_conn *iser_conn = conn->dd_data;
	struct iscsi_iser_task *iser_task = task->dd_data;
	unsigned long edtl;
	int err;
	struct iser_data_buf *data_buf;
	struct iscsi_cmd *hdr =  (struct iscsi_cmd *)task->hdr;
	struct scsi_cmnd *sc  =  task->sc;
	struct iser_tx_desc *tx_desc = &iser_task->desc;

	edtl = ntohl(hdr->data_length);

	/* build the tx desc regd header and add it to the tx desc dto */
	tx_desc->type = ISCSI_TX_SCSI_COMMAND;
	iser_create_send_desc(iser_conn->ib_conn, tx_desc);

	if (hdr->flags & ISCSI_FLAG_CMD_READ)
		data_buf = &iser_task->data[ISER_DIR_IN];
	else
		data_buf = &iser_task->data[ISER_DIR_OUT];

	if (scsi_sg_count(sc)) { /* using a scatter list */
		data_buf->buf  = scsi_sglist(sc);
		data_buf->size = scsi_sg_count(sc);
	}

	data_buf->data_len = scsi_bufflen(sc);

	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
		err = iser_prepare_read_cmd(task, edtl);
		if (err)
			goto send_command_error;
	}
	if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
		err = iser_prepare_write_cmd(task,
					     task->imm_count,
				             task->imm_count +
					     task->unsol_r2t.data_length,
					     edtl);
		if (err)
			goto send_command_error;
	}

	iser_task->status = ISER_TASK_STATUS_STARTED;

	err = iser_post_send(iser_conn->ib_conn, tx_desc);
	if (!err)
		return 0;

send_command_error:
	iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
	return err;
}

Example #2

File: iser_initiator.c Project: ivucica/linux

/**
 * iser_send_command - send command PDU
 */
int iser_send_command(struct iscsi_conn     *conn,
		      struct iscsi_cmd_task *ctask)
{
	struct iscsi_iser_conn *iser_conn = conn->dd_data;
	struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
	struct iser_dto *send_dto = NULL;
	unsigned long edtl;
	int err = 0;
	struct iser_data_buf *data_buf;

	struct iscsi_cmd *hdr =  ctask->hdr;
	struct scsi_cmnd *sc  =  ctask->sc;

	if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
		iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
		return -EPERM;
	}
	if (iser_check_xmit(conn, ctask))
		return -ENOBUFS;

	edtl = ntohl(hdr->data_length);

	/* build the tx desc regd header and add it to the tx desc dto */
	iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND;
	send_dto = &iser_ctask->desc.dto;
	send_dto->ctask = iser_ctask;
	iser_create_send_desc(iser_conn, &iser_ctask->desc);

	if (hdr->flags & ISCSI_FLAG_CMD_READ)
		data_buf = &iser_ctask->data[ISER_DIR_IN];
	else
		data_buf = &iser_ctask->data[ISER_DIR_OUT];

	if (sc->use_sg) { /* using a scatter list */
		data_buf->buf  = sc->request_buffer;
		data_buf->size = sc->use_sg;
	} else if (sc->request_bufflen) {
		/* using a single buffer - convert it into one entry SG */
		sg_init_one(&data_buf->sg_single,
			    sc->request_buffer, sc->request_bufflen);
		data_buf->buf   = &data_buf->sg_single;
		data_buf->size  = 1;
	}

	data_buf->data_len = sc->request_bufflen;

	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
		err = iser_prepare_read_cmd(ctask, edtl);
		if (err)
			goto send_command_error;
	}
	if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
		err = iser_prepare_write_cmd(ctask,
					     ctask->imm_count,
				             ctask->imm_count +
					     ctask->unsol_count,
					     edtl);
		if (err)
			goto send_command_error;
	}

	iser_reg_single(iser_conn->ib_conn->device,
			send_dto->regd[0], DMA_TO_DEVICE);

	if (iser_post_receive_control(conn) != 0) {
		iser_err("post_recv failed!\n");
		err = -ENOMEM;
		goto send_command_error;
	}

	iser_ctask->status = ISER_TASK_STATUS_STARTED;

	err = iser_post_send(&iser_ctask->desc);
	if (!err)
		return 0;

send_command_error:
	iser_dto_buffs_release(send_dto);
	iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err);
	return err;
}