Re: [Xen-devel] Little help with blk ring

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> 
> >>> On 07.05.12 at 08:23, Daniel Castro <evil.dani@xxxxxxxxx> wrote:
> > Hello List,
> >
> > I have a small problem with the ring when transferring blocks the id
> > on the response is different from the request.
> > This is the boot up read, count 0.
> > The guest requests block 0, it has to be located at 7c00.
> >
> > I go ahead and create a REQUEST with this data:
> > ring_req = RING_GET_REQUEST(priv,priv->req_prod_pvt);
> > ring_req->id = 9;
> > ring_req->nr_segments=1;
> > ring_req->operation = BLKIF_OP_READ;
> > ring_req->sector_number = (int)op->lba; //sector to be read
> > ring_req->seg[0].gref = (bi->buffer_gref); //this should be
> > get_free_gref(); ring_req->seg[0].first_sect = 0;//op->lba;
> > ring_req->seg[0].last_sect = 7;//op->lba + op->count;
> >
> > RING_PUSH_REQUESTS_AND_CHECK_NOTIFY((priv),notify);  //return
> notify=0
> > if(notify){
> >             dprintf(1,"Start notify procedure\n");
> >             evtchn_send_t send;
> >             send.port = (bi->port);
> >             dprintf(1,"In notify before hypercall port is %d\n",send.port);
> >             //hypercall_event_channel_op(EVTCHNOP_send, &send);
> >             dprintf(1,"HYPERCALL read operation notify res %d\n",
> > hypercall_event_channel_op(EVTCHNOP_send,&send));
> > }
> > ring_res = RING_GET_RESPONSE((priv),(temp->rsp_prod));
> > Then I get:
> > FAIL RING RESPONSE 0x0009a040 id:256 status:9 operation 0
> > this is the line:
> > dprintf(1,"FAIL RING RESPONSE %p id:%d status:%d operation %d\n",
> > ring_res,ring_res->id,ring_res->status,ring_res->operation);
> >
> >
> > The id should be the same on both the request and response, there are
> > bi ither requests on the fly.
> >
> > Any clue?=
> 
> With status happening to be 9 when id should be, is this perhaps a broken
> response structure definition?
> 

That would be my guess too. The structure aligns differently under 64 and 32 
bits so I'd guess the OP is talking between the two.

James


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