John,
+static int hisi_sas_dif_dma_map(struct hisi_hba *hisi_hba,
+ int *n_elem_dif, struct sas_task *task)
+{
+ struct device *dev = hisi_hba->dev;
+ struct sas_ssp_task *ssp_task;
+ struct scsi_cmnd *scsi_cmnd;
+ int rc;
+
+ if (task->num_scatter) {
+ ssp_task = &task->ssp_task;
+ scsi_cmnd = ssp_task->cmd;
+
+ if (scsi_prot_sg_count(scsi_cmnd)) {
+ *n_elem_dif = dma_map_sg(dev,
+ scsi_prot_sglist(scsi_cmnd),
+ scsi_prot_sg_count(scsi_cmnd),
+ task->data_dir);
+
If you're only supporting DIF there is no DMA mapping or unmapping since
the PI is generated by or verified by the HBA. No additional data is
transferred to/from host memory. The protection scatterlist will be
NULL.
+ switch (prot_op) {
+ case SCSI_PROT_READ_INSERT:
+ prot->dw0 |= T10_INSRT_EN_MSK;
+ prot->lbrtgv = lbrt_chk_val;
+ break;
+ case SCSI_PROT_READ_STRIP:
+ prot->dw0 |= (T10_RMV_EN_MSK | T10_CHK_EN_MSK);
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
+ case SCSI_PROT_READ_PASS:
+ prot->dw0 |= T10_CHK_EN_MSK;
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
+ case SCSI_PROT_WRITE_INSERT:
+ prot->dw0 |= T10_INSRT_EN_MSK;
+ prot->lbrtgv = lbrt_chk_val;
+ break;
+ case SCSI_PROT_WRITE_STRIP:
+ prot->dw0 |= (T10_RMV_EN_MSK | T10_CHK_EN_MSK);
+ prot->lbrtcv = lbrt_chk_val;
+ break;
+ case SCSI_PROT_WRITE_PASS:
+ prot->dw0 |= T10_CHK_EN_MSK;
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
+ default:
+ WARN(1, "prot_op(0x%x) is not valid\n", prot_op);
+ break;
+ }
DIF is WRITE_INSERT/READ_STRIP operations only.
+ if ((prot_op == SCSI_PROT_READ_INSERT) ||
+ (prot_op == SCSI_PROT_WRITE_INSERT) ||
+ (prot_op == SCSI_PROT_WRITE_PASS) ||
+ (prot_op == SCSI_PROT_READ_PASS)) {
+ unsigned int interval = scsi_prot_interval(scsi_cmnd);
+ unsigned int ilog2_interval = ilog2(interval);
+
+ len = (task->total_xfer_len >> ilog2_interval) * 8;
+ }
if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) {
+ .sg_prot_tablesize = HISI_SAS_SGE_PAGE_CNT,
Also not required if you're only doing DIF. There is no protection
scatterlist.
Anyway. Instead of throwing the DIX stuff away, let's figure out what
the problem is.