linux-kernel - Re: [RFC-v3 9/9] iser-target: Add iSCSI Extensions for RDMA (iSER) target driver

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Date:	Thu, 04 Apr 2013 15:23:42 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Or Gerlitz <ogerlitz@...lanox.com>
Cc:	target-devel <target-devel@...r.kernel.org>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Roland Dreier <roland@...nel.org>,
	Alexander Nezhinsky <alexandern@...lanox.com>
Subject: Re: [RFC-v3 9/9] iser-target: Add iSCSI Extensions for RDMA (iSER)
 target driver

On Thu, 2013-04-04 at 12:51 +0300, Or Gerlitz wrote:
> On 04/04/2013 10:24, Nicholas A. Bellinger wrote:
> > +static int
> > +isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
> > +{
> > +	struct isert_cmd *isert_cmd = container_of(cmd,
> > +					struct isert_cmd, iscsi_cmd);
> > +	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
> > +	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
> > +	struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
> > +				&isert_cmd->tx_desc.iscsi_header;
> > +
> > +	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
> > +	iscsit_build_rsp_pdu(cmd, conn, true, hdr);
> > +	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
> > +	/*
> > +	 * Attach SENSE DATA payload to iSCSI Response PDU
> > +	 */
> > +	if (cmd->se_cmd.sense_buffer &&
> > +	    ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
> > +	    (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
> > +		struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
> > +		struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
> > +		u32 padding, sense_len;
> > +
> > +		put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
> > +				   cmd->sense_buffer);
> > +		cmd->se_cmd.scsi_sense_length += sizeof(__be16);
> > +
> > +		padding = -(cmd->se_cmd.scsi_sense_length) & 3;
> > +		hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
> > +		sense_len = cmd->se_cmd.scsi_sense_length + padding;
> > +
> > +		isert_cmd->sense_buf_dma = ib_dma_map_single(ib_dev,
> > +				(void *)cmd->sense_buffer, sense_len,
> > +				DMA_TO_DEVICE);
> > +
> > +		isert_cmd->sense_buf_len = sense_len;
> > +		ib_dma_sync_single_for_cpu(ib_dev, isert_cmd->sense_buf_dma,
> > +					   sense_len, DMA_TO_DEVICE);
> > +		ib_dma_sync_single_for_device(ib_dev, isert_cmd->sense_buf_dma,
> > +					      sense_len, DMA_TO_DEVICE);
> > +
> 
> you just called dma_map_single, and not going to touch the buffer before 
> posting it to the wire,
> there's no point to sync it for the cpu and for the device, remove these 
> calls.
> 

Dropped.

Thanks Or!

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