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spapr-vscsi: Adding VSCSI capabilities

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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: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
This commit is contained in:
Nikunj A. Dadhania 2013-09-02 10:33:38 +05:30 committed by Paolo Bonzini
parent 65f3e33964
commit 26573a0c1f
1 changed files with 54 additions and 0 deletions
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54
hw/scsi/spapr_vscsi.c
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@ -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));