Commit 26573a0c authored by Nikunj A. Dadhania's avatar Nikunj A. Dadhania Committed by Paolo Bonzini
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spapr-vscsi: Adding VSCSI capabilities 



This implements capabilities exchange between vscsi host and client.  As
at the moment no capability is supported, put zero flags everywhere and
return.

Signed-off-by: default avatarNikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarNikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
parent 65f3e339

hw/scsi/spapr_vscsi.c

+54 −0
Original line number Diff line number Diff line
@@ -923,6 +923,57 @@ static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req) 
    return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);

}



static int vscsi_send_capabilities(VSCSIState *s, vscsi_req *req)

{

    struct viosrp_capabilities *vcap;

    struct capabilities cap = { };

    uint16_t len, req_len;

    uint64_t buffer;

    int rc;



    vcap = &req->iu.mad.capabilities;

    req_len = len = be16_to_cpu(vcap->common.length);

    buffer = be64_to_cpu(vcap->buffer);

    if (len > sizeof(cap)) {

        fprintf(stderr, "vscsi_send_capabilities: capabilities size mismatch !\n");



        /*

         * Just read and populate the structure that is known.

         * Zero rest of the structure.

         */

        len = sizeof(cap);

    }

    rc = spapr_vio_dma_read(&s->vdev, buffer, &cap, len);

    if (rc)  {

        fprintf(stderr, "vscsi_send_capabilities: DMA read failure !\n");

    }



    /*

     * Current implementation does not suppport any migration or

     * reservation capabilities. Construct the response telling the

     * guest not to use them.

     */

    cap.flags = 0;

    cap.migration.ecl = 0;

    cap.reserve.type = 0;

    cap.migration.common.server_support = 0;

    cap.reserve.common.server_support = 0;



    rc = spapr_vio_dma_write(&s->vdev, buffer, &cap, len);

    if (rc)  {

        fprintf(stderr, "vscsi_send_capabilities: DMA write failure !\n");

    }

    if (req_len > len) {

        /*

         * Being paranoid and lets not worry about the error code

         * here. Actual write of the cap is done above.

         */

        spapr_vio_dma_set(&s->vdev, (buffer + len), 0, (req_len - len));

    }

    vcap->common.status = rc ? cpu_to_be32(1) : 0;

    return vscsi_send_iu(s, req, sizeof(*vcap), VIOSRP_MAD_FORMAT);

}



static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)

{

    union mad_iu *mad = &req->iu.mad;
@@ -943,6 +994,9 @@ static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req) 
        mad->host_config.common.status = cpu_to_be16(1);

        vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);

        break;

    case VIOSRP_CAPABILITIES_TYPE:

        vscsi_send_capabilities(s, req);

        break;

    default:

        fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",

                be32_to_cpu(mad->empty_iu.common.type));