Re: [PATCH v3 2/7] MdePkg IndustryStandard/Scsi.h: Add sense code macro

["Tian, Feng" <feng.tian@intel.com>]

Linton,

Could you let me know where the +#define EFI_SCSI_REQUEST_SENSE_ERROR  (0x70) comes from?

According to SCSI SPC5r08 spec, the first byte of sense data is the RESPONSE CODE field. 

And 0x70 means

a) the result of an error, exception condition, or protocol specific failure that is associated with CHECK
CONDITION status; or
b) additional information that is associated with a status other than CHECK CONDITION.

It's possible that 0x70 means success... so this naming may be not quite appropriate.

And in your usage, you forcedly convert Packet->SenseData to UINT8 and access each sense data field by array index. I think it's unnecessary. Packet->SenseData is EFI_SCSI_SENSE_DATA type, which has defined the meaning of each field. With this structure, you don't need introduce EFI_SCSI_SK_VALUE macro again.

+        sense = (UINT8 *)Packet->SenseData;
+        if ((Packet->SenseDataLength > 13) &&
+            (sense[0] & EFI_SCSI_REQUEST_SENSE_ERROR)) {
+          DEBUG ((DEBUG_INFO, "SiI3132ScsiPassRead() Key %X ASC(Q) %02X%02X\n",
+                  EFI_SCSI_SK_VALUE (sense[2]), sense[12], sense[13]));
+        }

Thanks
Feng

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Jeremy Linton
Sent: Friday, February 24, 2017 6:34 AM
To: edk2-devel@lists.01.org
Cc: ard.biesheuvel@linaro.org; Steve.Capper@arm.com; ryan.harkin@linaro.org; leif.lindholm@linaro.org; linaro-uefi@lists.linaro.org
Subject: [edk2] [PATCH v3 2/7] MdePkg IndustryStandard/Scsi.h: Add sense code macro

Add some definitions to mask the sense key from sense data, and check the validity of the returned sense data.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
 MdePkg/Include/IndustryStandard/Scsi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MdePkg/Include/IndustryStandard/Scsi.h b/MdePkg/Include/IndustryStandard/Scsi.h
index 0d81314..802479e 100644
--- a/MdePkg/Include/IndustryStandard/Scsi.h
+++ b/MdePkg/Include/IndustryStandard/Scsi.h
@@ -369,6 +369,8 @@ typedef struct {
 //
 // Sense Key
 //
+#define EFI_SCSI_REQUEST_SENSE_ERROR  (0x70)
+#define EFI_SCSI_SK_VALUE(byte)       (byte&0x0F)
 #define EFI_SCSI_SK_NO_SENSE          (0x0)
 #define EFI_SCSI_SK_RECOVERY_ERROR    (0x1)
 #define EFI_SCSI_SK_NOT_READY         (0x2)
--
2.9.3

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