From: "Nikunj A. Dadhania" <nik...@linux.vnet.ibm.com>
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 <nik...@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Nikunj A. Dadhania <nik...@linux.vnet.ibm.com>
---
hw/scsi/spapr_vscsi.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c
index c31a870..f206452 100644
--- a/hw/scsi/spapr_vscsi.c
+++ b/hw/scsi/spapr_vscsi.c
@@ -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));
--
1.8.3.1
