[openib-general] Get Table Records for SA Attribute ID ?

Thu Feb 16 05:05:18 PST 2006

Hi Hal,

Thanks for the information.
Based on your feedback, I have corrected the SA MAD structure and added RMPP header as below:

typedef struct mad_header
{
    uint8_t     base_version;
    uint8_t     mgmt_class;
    uint8_t     class_version;
    uint8_t     response_bit;
    uint8_t     method;
    uint16_t    status;
    uint16_t    class_spec;
    uint64_t    tid;
    uint16_t    attr_id;
    uint16_t    resv;
    uint32_t    attr_mod;
} ib_mad_t ;

typedef struct _ib_rmpp_mad
{
    ib_mad_t                common_hdr;

    uint8_t                 rmpp_version;
    uint8_t                 rmpp_type;
    uint8_t                 rmpp_flags;
    uint8_t                 rmpp_status;

    uint32_t                seg_num;
    uint32_t                paylen_newwin;
    uint8_t                 data[192];

}   ib_rmpp_mad_t;

    ib_rmpp_mad_t *p_mad = (struct ib_rmpp_mad_t*)(umad_get_mad(umad));
    memset(p_mad, 0, sizeof(ib_rmpp_mad_t));

    p_mad->common_hdr.base_version = 1 ;
    p_mad->common_hdr.mgmt_class = IB_MCLASS_SUBN_ADM ;
    p_mad->common_hdr.class_version = (uint8_t) 2 ;
    p_mad->common_hdr.method = IB_MAD_METHOD_GET;
    p_mad->common_hdr.status = 0;
    p_mad->common_hdr.class_spec = 0;
    p_mad->common_hdr.tid = 0x123 ;
    p_mad->common_hdr.attr_id = IB_SA_ATTR_PATHRECORD ;
    p_mad->common_hdr.resv = 0;
    p_mad->common_hdr.attr_mod = 0 ;

    p_mad->rmpp_version = 1 ;
    p_mad->seg_num = 1 ;
    p_mad->rmpp_flags |= (uint8_t)0x70 ;
    p_mad->rmpp_status = 0;
    p_mad->paylen_newwin = IB_MAD_SIZE - MAD_RMPP_HDR_SIZE ; // 256 - 36

    umad_set_addr(umad, port_attr.sm_lid , 1, 0, IB_DEFAULT_QP1_QKEY);
    umad_set_grh(umad, 0);
    umad_set_pkey(umad, 0xFFFF); // IB_DEFAULT_PKEY 0xFFFF

I have registered umad with RMPP = 1. I have not started openSM instance here. I m using vendor specific SM. 
I have done umad_send(...) and umad_recv(). 

Could you please tell me, what should I do to retrieve the PathRecord after umad_recv(...) call ?
I believe, if I call function :  
          ib_rmpp_mad_t *recv_mad = (ib_rmpp_mad_t*)umad_get_mad(umad); and then 
          read this recv_mad will give me path record from local HCA ? 
Or is there anyother good way to do the same ?

Please throw some light on this. Do you have any userspace SA support for retrieving path, service record 
information ?

Regards.
- Takshak 

Hal Rosenstock wrote:

>Hi,
> 
>There are a couple of issues with the below.
> 
>1. SA MAD structure is missing the RMPP header. Once I saw that I didn't check for further issues with the format.
> 
>2. I will assume your register call sets RMPP.
> 
>3. SA class version is 2.
> 
>What SM are you using ? If you are using OpenSM, you can turn on verbose and see if the packet is seen by the SM. You could also enable madeye (in utils) to see if the packet is sent (and if anything is received back).
> 
>-- Hal
>
>________________________________
>
>From: openib-general-bounces at openib.org on behalf of Takshak C.
>Sent: Mon 2/6/2006 8:00 AM
>To: openib-general at openib.org
>Subject: [openib-general] Get Table Records for SA Attribute ID ?
>
>
>
>Hi,
>
>I m trying to get the table records for SA attribute ID in following way.
>But, I m not getting a single record, could anyone comment on the problem.
>
>1. I have created saMadFormat structure described in the specification as below:
>
>struct saMadFormat
>{
>
>    uint8_t base_version ;
>    uint8_t mgmt_class ;
>    uint8_t class_version ;
>    uint8_t sa_method ;
>    uint16_t    status ;
>    uint16_t    not_used ;
>    uint64_t    tid ;
>    uint16_t    attr_id ;
>    uint16_t    resv ;
>    uint32_t    attr_mod ;
>    uint64_t    sa_key;
>    uint64_t    sm_key ;
>    uint32_t    seg_num ;
>    uint32_t    payload_len ;
>    uint8_t     frag_flag ;
>    uint8_t edit_mod ;
>    uint16_t    window ;
>    uint32_t    endRID ;
>    uint64_t    comp_mask ;
>    uint8_t adminData[192] ;
>};
>
>2. Then I have done all the basic operations like umad_open, umad_register for the IB_SA_CLASS
>   and umad_open_port etc successfully.
>
>3. struct saMadFormat *saQuery = (struct saMadFormat*)(umad_get_mad(umad));
>   memset(saQuery, 0, sizeof(*saQuery));
>
>   saQuery->base_version = 1;
>   saQuery->mgmt_class = IB_SA_CLASS ;
>   saQuery->class_version = 1 ;
>   saQuery->sa_method = IB_MAD_METHOD_GET_TABLE ;
>   saQuery->attr_id = IB_SA_ATTR_PATHRECORD ;
>   saQuery->attr_mod = 0 ;
>   saQuery->tid  = htonll(drmad_tid++); 
>   saQuery->endRID = 0 ;
>
>   umad_set_addr(umad, lid, 1, 0, IB_DEFAULT_QP1_QKEY);
>   umad_set_grh(umad, 0);
>   umad_set_pkey(umad, 0xFFFF);
>
>4. length = IB_MAD_SIZE;
>
>  if (umad_send(portid, mad_agent, umad, length, timeout_ms, 0) < 0)
>     IBPANIC("send failed");                                                                                                                    
>
>  if (umad_recv(portid, umad, &length, -1) != mad_agent)
>     IBPANIC("recv error: %s", drmad_status_str(saQuery));
>
>                                                                                                                     
>
>  if (!dump_char) {
>      xdump(stdout, 0, saQuery->adminData, 192);
>      return 0;
>   }
>
>I m expecting that, I will get the resultant data in saQuery->adminData.
>Is this correct ? If not then, how should I retrieve the table records ?
>Any Idea ?
>
>
>Thanks
>- Takshak
>
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