C++ (Cpp) scsi_transfer_length Examples

Example #1

File: iser_memory.c Project: AlexShiLucky/linux

static int
iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
		struct iser_pi_context *pi_ctx,
		struct iser_mem_reg *data_reg,
		struct iser_mem_reg *prot_reg,
		struct iser_mem_reg *sig_reg)
{
	struct iser_tx_desc *tx_desc = &iser_task->desc;
	struct ib_sig_attrs *sig_attrs = &tx_desc->sig_attrs;
	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
	struct ib_sig_handover_wr *wr;
	struct ib_mr *mr = pi_ctx->sig_mr;
	int ret;

	memset(sig_attrs, 0, sizeof(*sig_attrs));
	ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
	if (ret)
		goto err;

	iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);

	if (pi_ctx->sig_mr_valid)
		iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);

	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));

	wr = container_of(iser_tx_next_wr(tx_desc), struct ib_sig_handover_wr,
			  wr);
	wr->wr.opcode = IB_WR_REG_SIG_MR;
	wr->wr.wr_cqe = cqe;
	wr->wr.sg_list = &data_reg->sge;
	wr->wr.num_sge = 1;
	wr->wr.send_flags = 0;
	wr->sig_attrs = sig_attrs;
	wr->sig_mr = mr;
	if (scsi_prot_sg_count(iser_task->sc))
		wr->prot = &prot_reg->sge;
	else
		wr->prot = NULL;
	wr->access_flags = IB_ACCESS_LOCAL_WRITE |
			   IB_ACCESS_REMOTE_READ |
			   IB_ACCESS_REMOTE_WRITE;
	pi_ctx->sig_mr_valid = 1;

	sig_reg->sge.lkey = mr->lkey;
	sig_reg->rkey = mr->rkey;
	sig_reg->sge.addr = 0;
	sig_reg->sge.length = scsi_transfer_length(iser_task->sc);

	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
		 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
		 sig_reg->sge.length);
err:
	return ret;
}

Example #2

File: tcm_loop.c Project: pombredanne/mithrandir

static void tcm_loop_submission_work(struct work_struct *work)
{
	struct tcm_loop_cmd *tl_cmd =
		container_of(work, struct tcm_loop_cmd, work);
	struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
	struct scsi_cmnd *sc = tl_cmd->sc;
	struct tcm_loop_nexus *tl_nexus;
	struct tcm_loop_hba *tl_hba;
	struct tcm_loop_tpg *tl_tpg;
	struct scatterlist *sgl_bidi = NULL;
	u32 sgl_bidi_count = 0, transfer_length;
	int rc;

	tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
	tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];

	/*
	 * Ensure that this tl_tpg reference from the incoming sc->device->id
	 * has already been configured via tcm_loop_make_naa_tpg().
	 */
	if (!tl_tpg->tl_hba) {
		set_host_byte(sc, DID_NO_CONNECT);
		goto out_done;
	}
	if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
		set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
		goto out_done;
	}
	tl_nexus = tl_hba->tl_nexus;
	if (!tl_nexus) {
		scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
				" does not exist\n");
		set_host_byte(sc, DID_ERROR);
		goto out_done;
	}
	if (scsi_bidi_cmnd(sc)) {
		struct scsi_data_buffer *sdb = scsi_in(sc);

		sgl_bidi = sdb->table.sgl;
		sgl_bidi_count = sdb->table.nents;
		se_cmd->se_cmd_flags |= SCF_BIDI;

	}

	transfer_length = scsi_transfer_length(sc);
	if (!scsi_prot_sg_count(sc) &&
	    scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
		se_cmd->prot_pto = true;
		/*
		 * loopback transport doesn't support
		 * WRITE_GENERATE, READ_STRIP protection
		 * information operations, go ahead unprotected.
		 */
		transfer_length = scsi_bufflen(sc);
	}

	rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
			&tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
			transfer_length, tcm_loop_sam_attr(sc),
			sc->sc_data_direction, 0,
			scsi_sglist(sc), scsi_sg_count(sc),
			sgl_bidi, sgl_bidi_count,
			scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
	if (rc < 0) {
		set_host_byte(sc, DID_NO_CONNECT);
		goto out_done;
	}
	return;

out_done:
	sc->scsi_done(sc);
	return;
}