On Thursday, July 26, 2007 11:09 AM, FUJITA Tomonori wrote:
> For smp request/response, we use:
>
> request -> not used
> response -> not used
> dout_xferp -> pointer to a smp request frame
> din_xferp -> pointer to a smp response frame
>
>
> So we could use response field to send vendor's unique response to
> user space.
>
> bsg wrongly assues the response field is used for sense buffer so the
> maxium length is SCSI_SENSE_BUFFERSIZE, 96 bytes. I think that it's a
> bit small for mpt's unique response. But, I'll fix the length
> limitation bug soon.
Well that's cool. It would be better the application had a description
of failures, rather than returning a vague ENXIO. Looks like 7 bytes
covers ioc_status(2 bytes), log_info (4 bytes), and sas_status(1 byte),
or better yet, lets return the entire mf reply, which looks to be 28
bytes. It doesn't matter. However, I'm not sure how to copy smprep
into sg_io_v4->response..I noticed that request frame is obtained from
rsp->bio, and the reply frame is returned via rsp->bio. Any
suggestions?
Here is the reply message frame format, Let me know if you need any
details on the those three fields.
/* Serial Management Protocol Passthrough Reply */
typedef struct _MSG_SMP_PASSTHROUGH_REPLY
{
U8 PassthroughFlags; /* 00h */
U8 PhysicalPort; /* 01h */
U8 MsgLength; /* 02h */
U8 Function; /* 03h */
U16 ResponseDataLength; /* 04h */
U8 Reserved1; /* 06h */
U8 MsgFlags; /* 07h */
U32 MsgContext; /* 08h */
U8 Reserved2; /* 0Ch */
U8 SASStatus; /* 0Dh */
U16 IOCStatus; /* 0Eh */
U32 IOCLogInfo; /* 10h */
U32 Reserved3; /* 14h */
U8 ResponseData[4]; /* 18h */
}
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