hw/nvme: basic directives support

Add support for the Directive Send and Recv commands and the Identify
directive.

Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

hw/nvme/ctrl.c

@@ -266,6 +266,8 @@ static const uint32_t nvme_cse_acs[256] = {
     [NVME_ADM_CMD_VIRT_MNGMT]       = NVME_CMD_EFF_CSUPP,
     [NVME_ADM_CMD_DBBUF_CONFIG]     = NVME_CMD_EFF_CSUPP,
     [NVME_ADM_CMD_FORMAT_NVM]       = NVME_CMD_EFF_CSUPP | NVME_CMD_EFF_LBCC,
+    [NVME_ADM_CMD_DIRECTIVE_RECV]   = NVME_CMD_EFF_CSUPP,
+    [NVME_ADM_CMD_DIRECTIVE_SEND]   = NVME_CMD_EFF_CSUPP,
 };
 
 static const uint32_t nvme_cse_iocs_none[256];
@@ -6150,6 +6152,37 @@ static uint16_t nvme_dbbuf_config(NvmeCtrl *n, const NvmeRequest *req)
     return NVME_SUCCESS;
 }
 
+static uint16_t nvme_directive_send(NvmeCtrl *n, NvmeRequest *req)
+{
+    return NVME_INVALID_FIELD | NVME_DNR;
+}
+
+static uint16_t nvme_directive_receive(NvmeCtrl *n, NvmeRequest *req)
+{
+    uint32_t dw10 = le32_to_cpu(req->cmd.cdw10);
+    uint32_t dw11 = le32_to_cpu(req->cmd.cdw11);
+    uint32_t nsid = le32_to_cpu(req->cmd.nsid);
+    uint8_t doper, dtype;
+    uint32_t numd, trans_len;
+    NvmeDirectiveIdentify id = {
+        .supported = 1 << NVME_DIRECTIVE_IDENTIFY,
+        .enabled = 1 << NVME_DIRECTIVE_IDENTIFY,
+    };
+
+    numd = dw10 + 1;
+    doper = dw11 & 0xff;
+    dtype = (dw11 >> 8) & 0xff;
+
+    trans_len = MIN(sizeof(NvmeDirectiveIdentify), numd << 2);
+
+    if (nsid == NVME_NSID_BROADCAST || dtype != NVME_DIRECTIVE_IDENTIFY ||
+        doper != NVME_DIRECTIVE_RETURN_PARAMS) {
+        return NVME_INVALID_FIELD | NVME_DNR;
+    }
+
+    return nvme_c2h(n, (uint8_t *)&id, trans_len, req);
+}
+
 static uint16_t nvme_admin_cmd(NvmeCtrl *n, NvmeRequest *req)
 {
     trace_pci_nvme_admin_cmd(nvme_cid(req), nvme_sqid(req), req->cmd.opcode,
@@ -6198,6 +6231,10 @@ static uint16_t nvme_admin_cmd(NvmeCtrl *n, NvmeRequest *req)
         return nvme_dbbuf_config(n, req);
     case NVME_ADM_CMD_FORMAT_NVM:
         return nvme_format(n, req);
+    case NVME_ADM_CMD_DIRECTIVE_SEND:
+        return nvme_directive_send(n, req);
+    case NVME_ADM_CMD_DIRECTIVE_RECV:
+        return nvme_directive_receive(n, req);
     default:
         assert(false);
     }
@@ -7454,7 +7491,8 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice *pci_dev)
     id->mdts = n->params.mdts;
     id->ver = cpu_to_le32(NVME_SPEC_VER);
     id->oacs =
-        cpu_to_le16(NVME_OACS_NS_MGMT | NVME_OACS_FORMAT | NVME_OACS_DBBUF);
+        cpu_to_le16(NVME_OACS_NS_MGMT | NVME_OACS_FORMAT | NVME_OACS_DBBUF |
+                    NVME_OACS_DIRECTIVES);
     id->cntrltype = 0x1;
 
     /*

hw/nvme/nvme.h

@@ -345,7 +345,9 @@ static inline const char *nvme_adm_opc_str(uint8_t opc)
     case NVME_ADM_CMD_GET_FEATURES:     return "NVME_ADM_CMD_GET_FEATURES";
     case NVME_ADM_CMD_ASYNC_EV_REQ:     return "NVME_ADM_CMD_ASYNC_EV_REQ";
     case NVME_ADM_CMD_NS_ATTACHMENT:    return "NVME_ADM_CMD_NS_ATTACHMENT";
+    case NVME_ADM_CMD_DIRECTIVE_SEND:   return "NVME_ADM_CMD_DIRECTIVE_SEND";
     case NVME_ADM_CMD_VIRT_MNGMT:       return "NVME_ADM_CMD_VIRT_MNGMT";
+    case NVME_ADM_CMD_DIRECTIVE_RECV:   return "NVME_ADM_CMD_DIRECTIVE_RECV";
     case NVME_ADM_CMD_DBBUF_CONFIG:     return "NVME_ADM_CMD_DBBUF_CONFIG";
     case NVME_ADM_CMD_FORMAT_NVM:       return "NVME_ADM_CMD_FORMAT_NVM";
     default:                            return "NVME_ADM_CMD_UNKNOWN";

include/block/nvme.h

@@ -613,7 +613,9 @@ enum NvmeAdminCommands {
     NVME_ADM_CMD_ACTIVATE_FW    = 0x10,
     NVME_ADM_CMD_DOWNLOAD_FW    = 0x11,
     NVME_ADM_CMD_NS_ATTACHMENT  = 0x15,
+    NVME_ADM_CMD_DIRECTIVE_SEND = 0x19,
     NVME_ADM_CMD_VIRT_MNGMT     = 0x1c,
+    NVME_ADM_CMD_DIRECTIVE_RECV = 0x1a,
     NVME_ADM_CMD_DBBUF_CONFIG   = 0x7c,
     NVME_ADM_CMD_FORMAT_NVM     = 0x80,
     NVME_ADM_CMD_SECURITY_SEND  = 0x81,
@@ -1165,6 +1167,7 @@ enum NvmeIdCtrlOacs {
     NVME_OACS_FORMAT        = 1 << 1,
     NVME_OACS_FW            = 1 << 2,
     NVME_OACS_NS_MGMT       = 1 << 3,
+    NVME_OACS_DIRECTIVES    = 1 << 5,
     NVME_OACS_DBBUF         = 1 << 8,
 };
 
@@ -1644,6 +1647,27 @@ typedef enum NvmeVirtualResourceType {
     NVME_VIRT_RES_INTERRUPT     = 0x01,
 } NvmeVirtualResourceType;
 
+typedef struct NvmeDirectiveIdentify {
+    uint8_t supported;
+    uint8_t unused1[31];
+    uint8_t enabled;
+    uint8_t unused33[31];
+    uint8_t rsvd64[4032];
+} NvmeDirectiveIdentify;
+
+enum NvmeDirective {
+    NVME_DIRECTIVE_SUPPORTED = 0x0,
+    NVME_DIRECTIVE_ENABLED   = 0x1,
+};
+
+enum NvmeDirectiveTypes {
+    NVME_DIRECTIVE_IDENTIFY = 0x0,
+};
+
+enum NvmeDirectiveOperations {
+    NVME_DIRECTIVE_RETURN_PARAMS = 0x1,
+};
+
 static inline void _nvme_check_size(void)
 {
     QEMU_BUILD_BUG_ON(sizeof(NvmeBar) != 4096);
@@ -1683,5 +1707,6 @@ static inline void _nvme_check_size(void)
     QEMU_BUILD_BUG_ON(sizeof(NvmeSecCtrlEntry) != 32);
     QEMU_BUILD_BUG_ON(sizeof(NvmeSecCtrlList) != 4096);
     QEMU_BUILD_BUG_ON(sizeof(NvmeEndGrpLog) != 512);
+    QEMU_BUILD_BUG_ON(sizeof(NvmeDirectiveIdentify) != 4096);
 }
 #endif