Exemple #1
0
int isert_pdu_rx(struct iscsi_cmnd *cmnd)
{
	int res = 0;
	scst_data_direction dir;

	TRACE_ENTRY();

#ifdef CONFIG_SCST_EXTRACHECKS
	cmnd->conn->rd_task = current;
#endif
	iscsi_cmnd_init(cmnd->conn, cmnd, NULL);
	cmnd_rx_start(cmnd);

	if (unlikely(!cmnd->scst_cmd)) {
		cmnd_rx_end(cmnd);
		goto out;
	}

	if (unlikely(scst_cmd_prelim_completed(cmnd->scst_cmd) ||
		     unlikely(cmnd->prelim_compl_flags != 0))) {
		set_bit(ISCSI_CMD_PRELIM_COMPLETED, &cmnd->prelim_compl_flags);
		cmnd_rx_end(cmnd);
		goto out;
	}

	dir = scst_cmd_get_data_direction(cmnd->scst_cmd);

	if (dir & SCST_DATA_WRITE) {
		res = iscsi_cmnd_set_write_buf(cmnd);
		if (unlikely(res))
			goto out;
		res = isert_request_data_out(cmnd);
		cmnd->r2t_len_to_receive = 0;
		cmnd->r2t_len_to_send = 0;
		cmnd->outstanding_r2t = 0;
	} else {
		cmnd_rx_end(cmnd);
	}

out:
	TRACE_EXIT_RES(res);
	return res;
}
Exemple #2
0
/*
 * Receive write data frame.
 */
void ft_recv_write_data(struct scst_cmd *cmd, struct fc_frame *fp)
{
	struct ft_cmd *fcmd;
	struct fc_frame_header *fh;
	unsigned int bufflen;
	u32 rel_off;
	size_t frame_len;
	size_t mem_len;
	size_t tlen;
	void *from;
	void *to;
	int dir;
	u8 *buf;

	dir = scst_cmd_get_data_direction(cmd);
	if (dir == SCST_DATA_BIDI) {
		mem_len = scst_get_out_buf_first(cmd, &buf);
		bufflen = scst_cmd_get_out_bufflen(cmd);
	} else {
		mem_len = scst_get_buf_first(cmd, &buf);
		bufflen = scst_cmd_get_bufflen(cmd);
	}
	to = buf;

	fcmd = scst_cmd_get_tgt_priv(cmd);
	fh = fc_frame_header_get(fp);
	frame_len = fr_len(fp);
	rel_off = ntohl(fh->fh_parm_offset);

	FT_IO_DBG("sid %x oxid %x payload_len %zd rel_off %x\n",
		  ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id),
		  frame_len - sizeof(*fh), rel_off);

	if (!(ntoh24(fh->fh_f_ctl) & FC_FC_REL_OFF))
		goto drop;
	if (frame_len <= sizeof(*fh))
		goto drop;
	frame_len -= sizeof(*fh);
	from = fc_frame_payload_get(fp, 0);

	if (rel_off >= bufflen)
		goto drop;
	if (frame_len + rel_off > bufflen)
		frame_len = bufflen - rel_off;

	while (frame_len) {
		if (!mem_len) {
			if (dir == SCST_DATA_BIDI) {
				scst_put_out_buf(cmd, buf);
				mem_len = scst_get_out_buf_next(cmd, &buf);
			} else {
				scst_put_buf(cmd, buf);
				mem_len = scst_get_buf_next(cmd, &buf);
			}
			to = buf;
			if (!mem_len)
				break;
		}
		if (rel_off) {
			if (rel_off >= mem_len) {
				rel_off -= mem_len;
				mem_len = 0;
				continue;
			}
			mem_len -= rel_off;
			to += rel_off;
			rel_off = 0;
		}

		tlen = min(mem_len, frame_len);
		memcpy(to, from, tlen);

		from += tlen;
		frame_len -= tlen;
		mem_len -= tlen;
		to += tlen;
		fcmd->write_data_len += tlen;
	}
	if (mem_len) {
		if (dir == SCST_DATA_BIDI)
			scst_put_out_buf(cmd, buf);
		else
			scst_put_buf(cmd, buf);
	}
	if (fcmd->write_data_len == cmd->data_len)
		scst_rx_data(cmd, SCST_RX_STATUS_SUCCESS, SCST_CONTEXT_THREAD);
drop:
	fc_frame_free(fp);
}