scsi: lpfc: Add support for 32 byte CDBs

The driver's I/O path is updated to support 32 byte CDBs.

Changes to accommodate 32 byte CDBs include:

- Updating various size fields to allow for the larger 32 byte CDB.

- Starting the FCP command payload at an earlier offset in WQE submission
to fit the 32 byte CDB.

- Redefining relevant structs to __le32/__be32 data types for proper cpu
endianness macro usage.

Signed-off-by: Justin Tee <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/lpfc/lpfc_hw4.h

···
 	uint32_t sge_len;
 };
 
+struct sli4_sge_le {
+	__le32 addr_hi;
+	__le32 addr_lo;
+
+	__le32 word2;
+	__le32 sge_len;
+};
+
 struct sli4_hybrid_sgl {
 	struct list_head list_node;
 	struct sli4_sge *dma_sgl;

drivers/scsi/lpfc/lpfc_init.c

···
 	shost->max_id = LPFC_MAX_TARGET;
 	shost->max_lun = vport->cfg_max_luns;
 	shost->this_id = -1;
-	shost->max_cmd_len = 16;
+	if (phba->sli_rev == LPFC_SLI_REV4)
+		shost->max_cmd_len = LPFC_FCP_CDB_LEN_32;
+	else
+		shost->max_cmd_len = LPFC_FCP_CDB_LEN;
 
 	if (phba->sli_rev == LPFC_SLI_REV4) {
 		if (!phba->cfg_fcp_mq_threshold ||
···
 		 * our max amount and we need to limit lpfc_sg_seg_cnt
 		 * to minimize the risk of running out.
 		 */
-		phba->cfg_sg_dma_buf_size = sizeof(struct fcp_cmnd) +
+		phba->cfg_sg_dma_buf_size = sizeof(struct fcp_cmnd32) +
 				sizeof(struct fcp_rsp) + max_buf_size;
 
 		/* Total SGEs for scsi_sg_list and scsi_sg_prot_list */
···
 		 * the FCP rsp, a SGE for each, and a SGE for up to
 		 * cfg_sg_seg_cnt data segments.
 		 */
-		phba->cfg_sg_dma_buf_size = sizeof(struct fcp_cmnd) +
+		phba->cfg_sg_dma_buf_size = sizeof(struct fcp_cmnd32) +
 				sizeof(struct fcp_rsp) +
 				((phba->cfg_sg_seg_cnt + extra) *
 				sizeof(struct sli4_sge));
···
 	phba->lpfc_cmd_rsp_buf_pool =
 			dma_pool_create("lpfc_cmd_rsp_buf_pool",
 					&phba->pcidev->dev,
-					sizeof(struct fcp_cmnd) +
+					sizeof(struct fcp_cmnd32) +
 					sizeof(struct fcp_rsp),
 					i, 0);
 	if (!phba->lpfc_cmd_rsp_buf_pool) {

drivers/scsi/lpfc/lpfc_scsi.c

···
 {
 	struct lpfc_io_buf *lpfc_cmd;
 	struct lpfc_sli4_hdw_queue *qp;
-	struct sli4_sge *sgl;
+	struct sli4_sge_le *sgl;
 	dma_addr_t pdma_phys_fcp_rsp;
 	dma_addr_t pdma_phys_fcp_cmd;
 	uint32_t cpu, idx;
···
 	 * The balance are sg list bdes. Initialize the
 	 * first two and leave the rest for queuecommand.
 	 */
-	sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl;
+	sgl = (struct sli4_sge_le *)lpfc_cmd->dma_sgl;
 	pdma_phys_fcp_cmd = tmp->fcp_cmd_rsp_dma_handle;
 	sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_cmd));
 	sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_cmd));
-	sgl->word2 = le32_to_cpu(sgl->word2);
-	bf_set(lpfc_sli4_sge_last, sgl, 0);
-	sgl->word2 = cpu_to_le32(sgl->word2);
-	sgl->sge_len = cpu_to_le32(sizeof(struct fcp_cmnd));
+	bf_set_le32(lpfc_sli4_sge_last, sgl, 0);
+	if (cmnd && cmnd->cmd_len > LPFC_FCP_CDB_LEN)
+		sgl->sge_len = cpu_to_le32(sizeof(struct fcp_cmnd32));
+	else
+		sgl->sge_len = cpu_to_le32(sizeof(struct fcp_cmnd));
+
 	sgl++;
 
 	/* Setup the physical region for the FCP RSP */
-	pdma_phys_fcp_rsp = pdma_phys_fcp_cmd + sizeof(struct fcp_cmnd);
+	pdma_phys_fcp_rsp = pdma_phys_fcp_cmd + sizeof(struct fcp_cmnd32);
 	sgl->addr_hi = cpu_to_le32(putPaddrHigh(pdma_phys_fcp_rsp));
 	sgl->addr_lo = cpu_to_le32(putPaddrLow(pdma_phys_fcp_rsp));
-	sgl->word2 = le32_to_cpu(sgl->word2);
-	bf_set(lpfc_sli4_sge_last, sgl, 1);
-	sgl->word2 = cpu_to_le32(sgl->word2);
+	bf_set_le32(lpfc_sli4_sge_last, sgl, 1);
 	sgl->sge_len = cpu_to_le32(sizeof(struct fcp_rsp));
 
 	if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
···
 	iocb_cmd->ulpLe = 1;
 
 	fcpdl = lpfc_bg_scsi_adjust_dl(phba, lpfc_cmd);
-	fcp_cmnd->fcpDl = be32_to_cpu(fcpdl);
+	fcp_cmnd->fcpDl = cpu_to_be32(fcpdl);
 
 	/*
 	 * Due to difference in data length between DIF/non-DIF paths,
···
 	 * explicitly reinitialized.
 	 * all iocb memory resources are reused.
 	 */
-	fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
+	if (scsi_cmnd->cmd_len > LPFC_FCP_CDB_LEN)
+		((struct fcp_cmnd32 *)fcp_cmnd)->fcpDl =
+				cpu_to_be32(scsi_bufflen(scsi_cmnd));
+	else
+		fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
 	/* Set first-burst provided it was successfully negotiated */
 	if (!test_bit(HBA_FCOE_MODE, &phba->hba_flag) &&
 	    vport->cfg_first_burst_size &&
 	    scsi_cmnd->sc_data_direction == DMA_TO_DEVICE) {
 		u32 init_len, total_len;
 
-		total_len = be32_to_cpu(fcp_cmnd->fcpDl);
+		total_len = scsi_bufflen(scsi_cmnd);
 		init_len = min(total_len, vport->cfg_first_burst_size);
 
 		/* Word 4 & 5 */
···
 	}
 
 	fcpdl = lpfc_bg_scsi_adjust_dl(phba, lpfc_cmd);
-	fcp_cmnd->fcpDl = be32_to_cpu(fcpdl);
+	if (lpfc_cmd->pCmd->cmd_len > LPFC_FCP_CDB_LEN)
+		((struct fcp_cmnd32 *)fcp_cmnd)->fcpDl = cpu_to_be32(fcpdl);
+	else
+		fcp_cmnd->fcpDl = cpu_to_be32(fcpdl);
 
 	/* Set first-burst provided it was successfully negotiated */
 	if (!test_bit(HBA_FCOE_MODE, &phba->hba_flag) &&
···
 	    scsi_cmnd->sc_data_direction == DMA_TO_DEVICE) {
 		u32 init_len, total_len;
 
-		total_len = be32_to_cpu(fcp_cmnd->fcpDl);
+		total_len = fcpdl;
 		init_len = min(total_len, vport->cfg_first_burst_size);
 
 		/* Word 4 & 5 */
···
 		wqe->fcp_iwrite.total_xfer_len = total_len;
 	} else {
 		/* Word 4 */
-		wqe->fcp_iwrite.total_xfer_len =
-			be32_to_cpu(fcp_cmnd->fcpDl);
+		wqe->fcp_iwrite.total_xfer_len = fcpdl;
 	}
 
 	/*
···
 			 fcprsp->rspInfo3);
 
 	scsi_set_resid(cmnd, 0);
-	fcpDl = be32_to_cpu(fcpcmd->fcpDl);
+	if (cmnd->cmd_len > LPFC_FCP_CDB_LEN)
+		fcpDl = be32_to_cpu(((struct fcp_cmnd32 *)fcpcmd)->fcpDl);
+	else
+		fcpDl = be32_to_cpu(fcpcmd->fcpDl);
 	if (resp_info & RESID_UNDER) {
 		scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
 
···
 				bf_set(wqe_iod, &wqe->fcp_iread.wqe_com,
 				       LPFC_WQE_IOD_NONE);
 		}
+
+		/* Additional fcp cdb length field calculation.
+		 * LPFC_FCP_CDB_LEN_32 - normal 16 byte cdb length,
+		 * then divide by 4 for the word count.
+		 * shift 2 because of the RDDATA/WRDATA.
+		 */
+		if (scsi_cmnd->cmd_len > LPFC_FCP_CDB_LEN)
+			fcp_cmnd->fcpCntl3 |= 4 << 2;
 	} else {
 		/* From the icmnd template, initialize words 4 - 11 */
 		memcpy(&wqe->words[4], &lpfc_icmnd_cmd_template.words[4],
···
 
 	 /* Word 3 */
 	bf_set(payload_offset_len, &wqe->fcp_icmd,
-	       sizeof(struct fcp_cmnd) + sizeof(struct fcp_rsp));
+	       sizeof(struct fcp_cmnd32) + sizeof(struct fcp_rsp));
 
 	/* Word 6 */
 	bf_set(wqe_ctxt_tag, &wqe->generic.wqe_com,
···
 	int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 		       &lpfc_cmd->fcp_cmnd->fcp_lun);
 
-	ptr = &fcp_cmnd->fcpCdb[0];
+	ptr = &((struct fcp_cmnd32 *)fcp_cmnd)->fcpCdb[0];
 	memcpy(ptr, scsi_cmnd->cmnd, scsi_cmnd->cmd_len);
 	if (scsi_cmnd->cmd_len < LPFC_FCP_CDB_LEN) {
 		ptr += scsi_cmnd->cmd_len;

drivers/scsi/lpfc/lpfc_scsi.h

···
 
 struct lpfc_hba;
 #define LPFC_FCP_CDB_LEN 16
+#define LPFC_FCP_CDB_LEN_32 32
 
 #define list_remove_head(list, entry, type, member)		\
 	do {							\
···
 #define SNSCOD_BADCMD 0x20	/* sense code is byte 13 ([12]) */
 };
 
-struct fcp_cmnd {
-	struct scsi_lun  fcp_lun;
-
-	uint8_t fcpCntl0;	/* FCP_CNTL byte 0 (reserved) */
-	uint8_t fcpCntl1;	/* FCP_CNTL byte 1 task codes */
 #define  SIMPLE_Q        0x00
 #define  HEAD_OF_Q       0x01
 #define  ORDERED_Q       0x02
 #define  ACA_Q           0x04
 #define  UNTAGGED        0x05
-	uint8_t fcpCntl2;	/* FCP_CTL byte 2 task management codes */
 #define  FCP_ABORT_TASK_SET  0x02	/* Bit 1 */
 #define  FCP_CLEAR_TASK_SET  0x04	/* bit 2 */
 #define  FCP_BUS_RESET       0x08	/* bit 3 */
···
 #define  FCP_TARGET_RESET    0x20	/* bit 5 */
 #define  FCP_CLEAR_ACA       0x40	/* bit 6 */
 #define  FCP_TERMINATE_TASK  0x80	/* bit 7 */
-	uint8_t fcpCntl3;
 #define  WRITE_DATA      0x01	/* Bit 0 */
 #define  READ_DATA       0x02	/* Bit 1 */
 
+struct fcp_cmnd {
+	struct scsi_lun  fcp_lun;
+
+	uint8_t fcpCntl0;	/* FCP_CNTL byte 0 (reserved) */
+	uint8_t fcpCntl1;	/* FCP_CNTL byte 1 task codes */
+	uint8_t fcpCntl2;	/* FCP_CTL byte 2 task management codes */
+	uint8_t fcpCntl3;
+
 	uint8_t fcpCdb[LPFC_FCP_CDB_LEN]; /* SRB cdb field is copied here */
-	uint32_t fcpDl;		/* Total transfer length */
+	__be32 fcpDl;		/* Total transfer length */
+
+};
+struct fcp_cmnd32 {
+	struct scsi_lun  fcp_lun;
+
+	uint8_t fcpCntl0;	/* FCP_CNTL byte 0 (reserved) */
+	uint8_t fcpCntl1;	/* FCP_CNTL byte 1 task codes */
+	uint8_t fcpCntl2;	/* FCP_CTL byte 2 task management codes */
+	uint8_t fcpCntl3;
+
+	uint8_t fcpCdb[LPFC_FCP_CDB_LEN_32]; /* SRB cdb field is copied here */
+	__be32 fcpDl;		/* Total transfer length */
 
 };
 

drivers/scsi/lpfc/lpfc_sli.c

···
 			BUFF_TYPE_BDE_IMMED;
 		wqe->generic.bde.tus.f.bdeSize = sgl->sge_len;
 		wqe->generic.bde.addrHigh = 0;
-		wqe->generic.bde.addrLow =  88;  /* Word 22 */
+		wqe->generic.bde.addrLow =  72;  /* Word 18 */
 
 		bf_set(wqe_wqes, &wqe->fcp_iwrite.wqe_com, 1);
 		bf_set(wqe_dbde, &wqe->fcp_iwrite.wqe_com, 0);
 
-		/* Word 22-29  FCP CMND Payload */
-		ptr = &wqe->words[22];
-		memcpy(ptr, fcp_cmnd, sizeof(struct fcp_cmnd));
+		/* Word 18-29  FCP CMND Payload */
+		ptr = &wqe->words[18];
+		memcpy(ptr, fcp_cmnd, sgl->sge_len);
 	} else {
 		/* Word 0-2 - Inline BDE */
 		wqe->generic.bde.tus.f.bdeFlags =  BUFF_TYPE_BDE_64;
-		wqe->generic.bde.tus.f.bdeSize = sizeof(struct fcp_cmnd);
+		wqe->generic.bde.tus.f.bdeSize = sgl->sge_len;
 		wqe->generic.bde.addrHigh = sgl->addr_hi;
 		wqe->generic.bde.addrLow =  sgl->addr_lo;
 
···
 		}
 
 		tmp->fcp_rsp = (struct fcp_rsp *)((uint8_t *)tmp->fcp_cmnd +
-				sizeof(struct fcp_cmnd));
+				sizeof(struct fcp_cmnd32));
 
 		spin_lock_irqsave(&hdwq->hdwq_lock, iflags);
 		list_add_tail(&tmp->list_node, &lpfc_buf->dma_cmd_rsp_list);