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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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?

Jan


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