[PATCH] lpfc: Fix cpu to/from endian warnings introduced by els processing

[PATCH] lpfc: Fix cpu to/from endian warnings introduced by els processing

[James Smart]

The kernel test robot reported the following sparse warning:
".../lpfc_els.c:3984:25: sparse: sparse: cast from restricted __be16"

For the error being flagged, using be32_to_cpu() on a be16 data type,
it was simple enough. But a review of other elements and warnings were
also evaluated.

This patch corrected several items in the original patch:
- using be32_to_cpu() on a be16 data type
- cpu_to_le32 used on a std uint32_t (cpu) data type.
  Note: this is a bytearray, but stored in le layout by hw at 32bit
   boundaries. So it possibly needed conversion.
- using cpu_to_le32() on a std uint16_t and assigned to a char typeA
- using le32_to_cpu on a le16 type
- missing cpu_to_le16 on an assignment

-- james

Fixes: 9064aeb2df8e ("scsi: lpfc: Add EDC ELS support")
Reported-by: kernel test robot <lkp@intel.com>
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
---
 drivers/scsi/lpfc/lpfc_els.c  |  8 ++++----
 drivers/scsi/lpfc/lpfc_hw4.h  |  2 +-
 drivers/scsi/lpfc/lpfc_init.c | 16 ++++++++--------
 drivers/scsi/lpfc/lpfc_sli.c  |  5 +++--
 4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 1254a575fd47..f3fc79b99165 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -4015,11 +4015,11 @@ lpfc_cmpl_els_edc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 				be32_to_cpu(pcgd->desc_tag),
 				be32_to_cpu(pcgd->desc_len),
 				be32_to_cpu(pcgd->xmt_signal_capability),
-				be32_to_cpu(pcgd->xmt_signal_frequency.count),
-				be32_to_cpu(pcgd->xmt_signal_frequency.units),
+				be16_to_cpu(pcgd->xmt_signal_frequency.count),
+				be16_to_cpu(pcgd->xmt_signal_frequency.units),
 				be32_to_cpu(pcgd->rcv_signal_capability),
-				be32_to_cpu(pcgd->rcv_signal_frequency.count),
-				be32_to_cpu(pcgd->rcv_signal_frequency.units));
+				be16_to_cpu(pcgd->rcv_signal_frequency.count),
+				be16_to_cpu(pcgd->rcv_signal_frequency.units));
 
 			/* Compare driver and Fport capabilities and choose
 			 * least common.
diff --git a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h
index 79a4872c2edb..7359505e6041 100644
--- a/drivers/scsi/lpfc/lpfc_hw4.h
+++ b/drivers/scsi/lpfc/lpfc_hw4.h
@@ -1167,7 +1167,7 @@ struct lpfc_mbx_read_object {  /* Version 0 */
 #define lpfc_mbx_rd_object_rlen_MASK	0x00FFFFFF
 #define lpfc_mbx_rd_object_rlen_WORD	word0
 			uint32_t rd_object_offset;
-			uint32_t rd_object_name[LPFC_MBX_OBJECT_NAME_LEN_DW];
+			__le32 rd_object_name[LPFC_MBX_OBJECT_NAME_LEN_DW];
 #define LPFC_OBJ_NAME_SZ 104   /* 26 x sizeof(uint32_t) is 104. */
 			uint32_t rd_object_cnt;
 			struct lpfc_mbx_host_buf rd_object_hbuf[4];
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 6e742d31258d..d3f1fa38269f 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -5518,7 +5518,7 @@ lpfc_cgn_update_stat(struct lpfc_hba *phba, uint32_t dtag)
 	if (phba->cgn_fpin_frequency &&
 	    phba->cgn_fpin_frequency != LPFC_FPIN_INIT_FREQ) {
 		value = LPFC_CGN_TIMER_TO_MIN / phba->cgn_fpin_frequency;
-		cp->cgn_stat_npm = cpu_to_le32(value);
+		cp->cgn_stat_npm = value;
 	}
 	value = lpfc_cgn_calc_crc32(cp, LPFC_CGN_INFO_SZ,
 				    LPFC_CGN_CRC32_SEED);
@@ -5547,9 +5547,9 @@ lpfc_cgn_save_evt_cnt(struct lpfc_hba *phba)
 	uint32_t mbps;
 	uint32_t dvalue, wvalue, lvalue, avalue;
 	uint64_t latsum;
-	uint16_t *ptr;
-	uint32_t *lptr;
-	uint16_t *mptr;
+	__le16 *ptr;
+	__le32 *lptr;
+	__le16 *mptr;
 
 	/* Make sure we have a congestion info buffer */
 	if (!phba->cgn_i)
@@ -5570,7 +5570,7 @@ lpfc_cgn_save_evt_cnt(struct lpfc_hba *phba)
 	if (phba->cgn_fpin_frequency &&
 	    phba->cgn_fpin_frequency != LPFC_FPIN_INIT_FREQ) {
 		value = LPFC_CGN_TIMER_TO_MIN / phba->cgn_fpin_frequency;
-		cp->cgn_stat_npm = cpu_to_le32(value);
+		cp->cgn_stat_npm = value;
 	}
 
 	/* Read and clear the latency counters for this minute */
@@ -5753,7 +5753,7 @@ lpfc_cgn_save_evt_cnt(struct lpfc_hba *phba)
 			dvalue += le32_to_cpu(cp->cgn_drvr_hr[i]);
 			wvalue += le32_to_cpu(cp->cgn_warn_hr[i]);
 			lvalue += le32_to_cpu(cp->cgn_latency_hr[i]);
-			mbps += le32_to_cpu(cp->cgn_bw_hr[i]);
+			mbps += le16_to_cpu(cp->cgn_bw_hr[i]);
 			avalue += le32_to_cpu(cp->cgn_alarm_hr[i]);
 		}
 		if (lvalue)		/* Avg of latency averages */
@@ -13411,8 +13411,8 @@ lpfc_init_congestion_buf(struct lpfc_hba *phba)
 
 	/* last used Index initialized to 0xff already */
 
-	cp->cgn_warn_freq = LPFC_FPIN_INIT_FREQ;
-	cp->cgn_alarm_freq = LPFC_FPIN_INIT_FREQ;
+	cp->cgn_warn_freq = cpu_to_le16(LPFC_FPIN_INIT_FREQ);
+	cp->cgn_alarm_freq = cpu_to_le16(LPFC_FPIN_INIT_FREQ);
 	crc = lpfc_cgn_calc_crc32(cp, LPFC_CGN_INFO_SZ, LPFC_CGN_CRC32_SEED);
 	cp->cgn_info_crc = cpu_to_le32(crc);
 
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index ffd8a140638c..78ce38d7251c 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -22090,6 +22090,7 @@ lpfc_read_object(struct lpfc_hba *phba, char *rdobject, uint32_t *datap,
 	uint32_t shdr_status, shdr_add_status;
 	union lpfc_sli4_cfg_shdr *shdr;
 	struct lpfc_dmabuf *pcmd;
+	u32 rd_object_name[LPFC_MBX_OBJECT_NAME_LEN_DW] = {0};
 
 	/* sanity check on queue memory */
 	if (!datap)
@@ -22113,10 +22114,10 @@ lpfc_read_object(struct lpfc_hba *phba, char *rdobject, uint32_t *datap,
 
 	memset((void *)read_object->u.request.rd_object_name, 0,
 	       LPFC_OBJ_NAME_SZ);
-	sprintf((uint8_t *)read_object->u.request.rd_object_name, rdobject);
+	scnprintf((char *)rd_object_name, sizeof(rd_object_name), rdobject);
 	for (j = 0; j < strlen(rdobject); j++)
 		read_object->u.request.rd_object_name[j] =
-			cpu_to_le32(read_object->u.request.rd_object_name[j]);
+			cpu_to_le32(rd_object_name[j]);
 
 	pcmd = kmalloc(sizeof(*pcmd), GFP_KERNEL);
 	if (pcmd)
-- 
2.26.2

Re: [PATCH] lpfc: Fix cpu to/from endian warnings introduced by els processing

[Martin K. Petersen]

On Mon, 30 Aug 2021 16:12:43 -0700, James Smart wrote:

> The kernel test robot reported the following sparse warning:
> ".../lpfc_els.c:3984:25: sparse: sparse: cast from restricted __be16"
> 
> For the error being flagged, using be32_to_cpu() on a be16 data type,
> it was simple enough. But a review of other elements and warnings were
> also evaluated.
> 
> [...]

Applied to 5.15/scsi-fixes, thanks!

[1/1] lpfc: Fix cpu to/from endian warnings introduced by els processing
      https://git.kernel.org/mkp/scsi/c/59936430e6a6

-- 
Martin K. Petersen	Oracle Linux Engineering