From 26573a0c1f0427be168a537abccbcc942e07aa72 Mon Sep 17 00:00:00 2001 From: "Nikunj A. Dadhania" Date: Mon, 2 Sep 2013 10:33:38 +0530 Subject: 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: Nikunj A Dadhania Signed-off-by: Paolo Bonzini Signed-off-by: Nikunj A. Dadhania --- hw/scsi/spapr_vscsi.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) (limited to 'hw/scsi') diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c index c31a870486..f206452c74 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)); -- cgit v1.2.1