scsi: lpfc: Fix ELS field alignments

After seeing some interoperability issues with ADISC, it was determined the
ELS definitions in lpfc were using types that allowed the compiler to add
pad to the structure, causing the structure to no longer be per spec. The
offending structures are ADISC, FAN, and RNID.

This patch implements the simple fix of eliminating the pad by forcing the
compiler to pack the structure. Care was taken to ensure field accesses
won't be by operations that would hit a bad field alignment.

The better solution would be to convert to the uapi fc header definitions,
but the number of changes required to do is rather intrusive so this course
of action was deferred.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/lpfc/lpfc_hw.h b/drivers/scsi/lpfc/lpfc_hw.h
index 5b439a6dcde15601cecddd1a9bf1c28ea9118109..436cdc8c5ef4671c43cd2c55b66abafbb5926f2e 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_hw.h
+++ b/drivers/scsi/lpfc/lpfc_hw.h
@@ -843,7 +843,7 @@ typedef struct _ADISC {             /* Structure is in Big Endian format */
        struct lpfc_name portName;
        struct lpfc_name nodeName;
        uint32_t DID;
-} ADISC;
+} __packed ADISC;
 
 typedef struct _FARP {         /* Structure is in Big Endian format */
        uint32_t Mflags:8;
@@ -873,7 +873,7 @@ typedef struct _FAN {               /* Structure is in Big Endian format */
        uint32_t Fdid;
        struct lpfc_name FportName;
        struct lpfc_name FnodeName;
-} FAN;
+} __packed FAN;
 
 typedef struct _SCR {          /* Structure is in Big Endian format */
        uint8_t resvd1;
@@ -917,7 +917,7 @@ typedef struct _RNID {              /* Structure is in Big Endian format */
        union {
                RNID_TOP_DISC topologyDisc;     /* topology disc (0xdf) */
        } un;
-} RNID;
+} __packed RNID;
 
 typedef struct  _RPS {         /* Structure is in Big Endian format */
        union {