[PATCH v7 19/48] nvme: support identify namespace descriptor list

[Klaus Jensen]

From: Klaus Jensen <address@hidden>

Since we are not providing the NGUID or EUI64 fields, we must support
the Namespace UUID. We do not have any way of storing a persistent
unique identifier, so conjure up a UUID that is just the namespace id.

Signed-off-by: Klaus Jensen <address@hidden>
---
 hw/block/nvme.c       | 39 +++++++++++++++++++++++++++++++++++++++
 hw/block/trace-events |  1 +
 2 files changed, 40 insertions(+)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index d4622278450e..f40bc861facc 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -949,6 +949,43 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, 
NvmeIdentify *c)
     return ret;
 }
 
+static uint16_t nvme_identify_ns_descr_list(NvmeCtrl *n, NvmeIdentify *c)
+{
+    uint32_t nsid = le32_to_cpu(c->nsid);
+    uint64_t prp1 = le64_to_cpu(c->prp1);
+    uint64_t prp2 = le64_to_cpu(c->prp2);
+
+    uint8_t list[NVME_IDENTIFY_DATA_SIZE];
+
+    struct data {
+        struct {
+            NvmeIdNsDescr hdr;
+            uint8_t v[16];
+        } uuid;
+    };
+
+    struct data *ns_descrs = (struct data *)list;
+
+    trace_nvme_dev_identify_ns_descr_list(nsid);
+
+    if (unlikely(nsid == 0 || nsid > n->num_namespaces)) {
+        trace_nvme_dev_err_invalid_ns(nsid, n->num_namespaces);
+        return NVME_INVALID_NSID | NVME_DNR;
+    }
+
+    /*
+     * Because the NGUID and EUI64 fields are 0 in the Identify Namespace data
+     * structure, a Namespace UUID (nidt = 0x3) must be reported in the
+     * Namespace Identification Descriptor. Add a very basic Namespace UUID
+     * here.
+     */
+    ns_descrs->uuid.hdr.nidt = NVME_NIDT_UUID;
+    ns_descrs->uuid.hdr.nidl = NVME_NIDT_UUID_LEN;
+    stl_be_p(&ns_descrs->uuid.v, nsid);
+
+    return nvme_dma_read_prp(n, list, NVME_IDENTIFY_DATA_SIZE, prp1, prp2);
+}
+
 static uint16_t nvme_identify(NvmeCtrl *n, NvmeCmd *cmd)
 {
     NvmeIdentify *c = (NvmeIdentify *)cmd;
@@ -960,6 +997,8 @@ static uint16_t nvme_identify(NvmeCtrl *n, NvmeCmd *cmd)
         return nvme_identify_ctrl(n, c);
     case NVME_ID_CNS_NS_ACTIVE_LIST:
         return nvme_identify_nslist(n, c);
+    case NVME_ID_CNS_NS_DESCR_LIST:
+        return nvme_identify_ns_descr_list(n, c);
     default:
         trace_nvme_dev_err_invalid_identify_cns(le32_to_cpu(c->cns));
         return NVME_INVALID_FIELD | NVME_DNR;
diff --git a/hw/block/trace-events b/hw/block/trace-events
index fb5b26f6f5f6..7ecd47131ac2 100644
--- a/hw/block/trace-events
+++ b/hw/block/trace-events
@@ -45,6 +45,7 @@ nvme_dev_del_cq(uint16_t cqid) "deleted completion queue, 
cqid=%"PRIu16""
 nvme_dev_identify_ctrl(void) "identify controller"
 nvme_dev_identify_ns(uint32_t ns) "nsid %"PRIu32""
 nvme_dev_identify_nslist(uint32_t ns) "nsid %"PRIu32""
+nvme_dev_identify_ns_descr_list(uint32_t ns) "nsid %"PRIu32""
 nvme_dev_getfeat(uint16_t cid, uint32_t fid) "cid %"PRIu16" fid 0x%"PRIx32""
 nvme_dev_setfeat(uint16_t cid, uint32_t fid, uint32_t val) "cid %"PRIu16" fid 
0x%"PRIx32" val 0x%"PRIx32""
 nvme_dev_getfeat_vwcache(const char* result) "get feature volatile write 
cache, result=%s"
-- 
2.26.0