I checked the debug message and the code in iscsi_tcp_segment_done
but i can not understand the infomation in tcp debug info shown below.

twice ?

Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_send_data_prep
(cb76be00, offset=0, datalen=12)
Sep 27 09:37:01 localhost kernel: tcp: copied 0 0 size 48 xmit
Sep 27 09:37:01 localhost kernel: tcp: copied 0 48 size 48 xmit
Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_unmap
cb76bf4c
Sep 27 09:37:01 localhost kernel: tcp: total copied 48 total size 48
Sep 27 09:37:01 localhost kernel: tcp: Header done. Next segment size
12 total_size 12
Sep 27 09:37:01 localhost kernel: tcp: copied 0 0 size 12
xmit             ------------------------------------- This place
Sep 27 09:37:01 localhost kernel: tcp: copied 0 12 size 12
xmit            ------------------------------------- can not
understand
Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_unmap
cb76bf4c
Sep 27 09:37:01 localhost kernel: tcp: total copied 12 total size
12       -------------------------------------
Sep 27 09:37:01 localhost kernel: tcp: copied 0 0 size 0 xmit
Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_unmap
cb76bf4c
Sep 27 09:37:01 localhost kernel: tcp: total copied 12 total size
12       --------------------------------------
Sep 27 09:37:01 localhost kernel: tcp: xmit 60 bytes
Sep 27 09:37:01 localhost kernel: tcp: no R2Ts yet
Sep 27 09:37:01 localhost kernel: tcp: in 60 bytes
Sep 27 09:37:01 localhost kernel: tcp: skb dfab65c0 ptr=da5a5a54
avail=60

On Sep 30, 2:48 am, Mike Christie <micha...@cs.wisc.edu> wrote:
> On 09/26/2009 09:20 PM, niko scsi wrote:
>
>
>
>
>
> > I followed the 
> > howtohttp://tldp.org/HOWTO/SCSI-Generic-HOWTO/scsi_snd_cmd.html
> > to pass through scsi cmd with data (self defined,target can handle
> > it)  to iscsi disk.
> >   however,the request was handled six times ,I checked the log ,the
> > reason is shown below. The connection failed and recovered six
> > times ,and I tested many times ,each time ,the same :six times!
> > I'm newbie to scsi program. Any idea that can cause this problem ?
>
> > error occurred in function iscsi_data_rsp
>
> > tcp debug infomations show below :
>
> > .......................................
> > Sep 27 09:37:01 localhost kernel: tcp: skb dfab65c0 ptr=da5a5a54
> > avail=60
> > Sep 27 09:37:01 localhost kernel: tcp: copied 0 0 size 48 recv
> > Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_recv copying
> > 48
> > Sep 27 09:37:01 localhost kernel: tcp: copied 0 48 size 48 recv
> > Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_unmap
> > cb76be10
> > Sep 27 09:37:01 localhost kernel: tcp: total copied 48 total size 48
> > Sep 27 09:37:01 localhost kernel: tcp: segment done
> > Sep 27 09:37:01 localhost kernel: tcp: opcode 0x25 ahslen 0 datalen 12
> > Sep 27 09:37:01 localhost kernel: tcp: iscsi_data_rsp: ctask-
> >> exp_datasn(1) != rhdr->datasn(0)
>
> You might not be doing anything wrong. It might a target or initiator bug.
>
> What target are you using? In your setup, did you modify the iscsi
> target in some way?
>
> And what kernel are using?- Hide quoted text -
>
> - Show quoted text -

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