On Tue, Aug 18, 2009 at 1:34 PM, Boaz Harrosh<bharrosh@xxxxxxxxxxx> wrote:
Dear Boaz,
Thanks for the information.
> drivers/scsi/osd/osd_initiator.c
I did not find this file in my 2.6.28 sources.
> On the scsi-driver side you do:
>
> if (scsi_bidi_cmnd(cmnd)) {
> in_sgl = scsi_in(cmnd)->table.sgl;
> in_nents = scsi_in(cmnd)->table.nents;
> in_bytes = scsi_in(cmnd)->length;
>
> /* Same thing for out */
> out_sgl = scsi_out(cmnd)->table.sgl;
> ...
> }
Do I need to modify the SCSI driver files to handle the
bi-directional comamnds or Is this already supported?
> What type of scsi-device are you using?
I am working for USB Attached SCSI (UAS) device which supports
bi-directional commands. I'm modifying USB Mass storage driver
according to UAS requirements. Whenever there is command to process,
SCSI layer sends scsi_cmnd structure pointer to UAS class driver (my
driver - modified mass storage driver). But I did not find two data
pointers and two data length variables (one IN and one OUT) in this
structure to handle bi-directional data.
I found only one struct scsi_data_buffer pointer in scsi_cmnd
structure. So, how do SCSI layer sends IN and OUT buffer pointers and
their lengths to my class driver?
> what bidi commands?
I did not understand this. Could you please elaborate it? Are there
any bidi commands like READ_10 or WRITE_10 which are specific to any
device?
Thanks and Regards,
Madhavi M.
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