From: Roque Arcudia Hernandez <roq...@google.com>
This patch adds a way to specify an NGUID for a given NVMe Namespace using a
string of hexadecimal digits with an optional '-' separator to group bytes. For
instance:
-device nvme-ns,nguid="e9accd3b83904e13167cf0593437f57d"
If provided, the NGUID will be part of the Namespace Identification Descriptor
list and the Identify Namespace data.
Signed-off-by: Roque Arcudia Hernandez <roq...@google.com>
Signed-off-by: Nabih Estefan <nabiheste...@google.com>
Reviewed-by: Klaus Jensen <k.jen...@samsung.com>
Signed-off-by: Klaus Jensen <k.jen...@samsung.com>
---
docs/system/devices/nvme.rst | 7 ++
hw/nvme/ctrl.c | 12 +++
hw/nvme/meson.build | 2 +-
hw/nvme/nguid.c | 187 +++++++++++++++++++++++++++++++++++
hw/nvme/ns.c | 2 +
hw/nvme/nvme.h | 26 +++--
6 files changed, 229 insertions(+), 7 deletions(-)
create mode 100644 hw/nvme/nguid.c
diff --git a/docs/system/devices/nvme.rst b/docs/system/devices/nvme.rst
index 4ea957baed10..d2b1ca96455f 100644
--- a/docs/system/devices/nvme.rst
+++ b/docs/system/devices/nvme.rst
@@ -81,6 +81,13 @@ There are a number of parameters available:
Set the UUID of the namespace. This will be reported as a "Namespace UUID"
descriptor in the Namespace Identification Descriptor List.
+``nguid``
+ Set the NGUID of the namespace. This will be reported as a "Namespace
Globally
+ Unique Identifier" descriptor in the Namespace Identification Descriptor
List.
+ It is specified as a string of hexadecimal digits containing exactly 16 bytes
+ or "auto" for a random value. An optional '-' separator could be used to
group
+ bytes. If not specified the NGUID will remain all zeros.
+
``eui64``
Set the EUI-64 of the namespace. This will be reported as a "IEEE Extended
Unique Identifier" descriptor in the Namespace Identification Descriptor
List.
diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index abc0387f2ca8..6c5a2b875da8 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -5640,6 +5640,10 @@ static uint16_t nvme_identify_ns_descr_list(NvmeCtrl *n,
NvmeRequest *req)
NvmeIdNsDescr hdr;
uint8_t v[NVME_NIDL_UUID];
} QEMU_PACKED uuid = {};
+ struct {
+ NvmeIdNsDescr hdr;
+ uint8_t v[NVME_NIDL_NGUID];
+ } QEMU_PACKED nguid = {};
struct {
NvmeIdNsDescr hdr;
uint64_t v;
@@ -5668,6 +5672,14 @@ static uint16_t nvme_identify_ns_descr_list(NvmeCtrl *n,
NvmeRequest *req)
pos += sizeof(uuid);
}
+ if (!nvme_nguid_is_null(&ns->params.nguid)) {
+ nguid.hdr.nidt = NVME_NIDT_NGUID;
+ nguid.hdr.nidl = NVME_NIDL_NGUID;
+ memcpy(nguid.v, ns->params.nguid.data, NVME_NIDL_NGUID);
+ memcpy(pos, &nguid, sizeof(nguid));
+ pos += sizeof(nguid);
+ }
+
if (ns->params.eui64) {
eui64.hdr.nidt = NVME_NIDT_EUI64;
eui64.hdr.nidl = NVME_NIDL_EUI64;
diff --git a/hw/nvme/meson.build b/hw/nvme/meson.build
index 1a6a2ca2f307..7d5caa53c280 100644
--- a/hw/nvme/meson.build
+++ b/hw/nvme/meson.build
@@ -1 +1 @@
-system_ss.add(when: 'CONFIG_NVME_PCI', if_true: files('ctrl.c', 'dif.c',
'ns.c', 'subsys.c'))
+system_ss.add(when: 'CONFIG_NVME_PCI', if_true: files('ctrl.c', 'dif.c',
'ns.c', 'subsys.c', 'nguid.c'))
\ No newline at end of file
diff --git a/hw/nvme/nguid.c b/hw/nvme/nguid.c
new file mode 100644
index 000000000000..829832bd9f41
--- /dev/null
+++ b/hw/nvme/nguid.c
@@ -0,0 +1,187 @@
+/*
+ * QEMU NVMe NGUID functions
+ *
+ * Copyright 2024 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/visitor.h"
+#include "qemu/ctype.h"
+#include "nvme.h"
+
+#define NGUID_SEPARATOR '-'
+
+#define NGUID_VALUE_AUTO "auto"
+
+#define NGUID_FMT \
+ "%02hhx%02hhx%02hhx%02hhx" \
+ "%02hhx%02hhx%02hhx%02hhx" \
+ "%02hhx%02hhx%02hhx%02hhx" \
+ "%02hhx%02hhx%02hhx%02hhx"
+
+#define NGUID_STR_LEN (2 * NGUID_LEN + 1)
+
+bool nvme_nguid_is_null(const NvmeNGUID *nguid)
+{
+ static NvmeNGUID null_nguid;
+ return memcmp(nguid, &null_nguid, sizeof(NvmeNGUID)) == 0;
+}
+
+static void nvme_nguid_generate(NvmeNGUID *out)
+{
+ int i;
+ uint32_t x;
+
+ QEMU_BUILD_BUG_ON((NGUID_LEN % sizeof(x)) != 0);
+
+ for (i = 0; i < NGUID_LEN; i += sizeof(x)) {
+ x = g_random_int();
+ memcpy(&out->data[i], &x, sizeof(x));
+ }
+}
+
+/*
+ * The Linux Kernel typically prints the NGUID of an NVMe namespace using the
+ * same format as the UUID. For instance:
+ *
+ * $ cat /sys/class/block/nvme0n1/nguid
+ * e9accd3b-8390-4e13-167c-f0593437f57d
+ *
+ * When there is no UUID but there is NGUID the Kernel will print the NGUID as
+ * wwid and it won't use the UUID format:
+ *
+ * $ cat /sys/class/block/nvme0n1/wwid
+ * eui.e9accd3b83904e13167cf0593437f57d
+ *
+ * The NGUID has different fields compared to the UUID, so the grouping used in
+ * the UUID format has no relation with the 3 fields of the NGUID.
+ *
+ * This implementation won't expect a strict format as the UUID one and instead
+ * it will admit any string of hexadecimal digits. Byte groups could be created
+ * using the '-' separator. The number of bytes needs to be exactly 16 and the
+ * separator '-' has to be exactly in a byte boundary. The following are
+ * examples of accepted formats for the NGUID string:
+ *
+ * nguid="e9accd3b-8390-4e13-167c-f0593437f57d"
+ * nguid="e9accd3b83904e13167cf0593437f57d"
+ * nguid="FEDCBA9876543210-ABCDEF-0123456789"
+ */
+static bool nvme_nguid_is_valid(const char *str)
+{
+ int i;
+ int digit_count = 0;
+
+ for (i = 0; i < strlen(str); i++) {
+ const char c = str[i];
+ if (qemu_isxdigit(c)) {
+ digit_count++;
+ continue;
+ }
+ if (c == NGUID_SEPARATOR) {
+ /*
+ * We need to make sure the separator is in a byte boundary, the
+ * string does not start with the separator and they are not back
to
+ * back "--".
+ */
+ if ((i > 0) && (str[i - 1] != NGUID_SEPARATOR) &&
+ (digit_count % 2) == 0) {
+ continue;
+ }
+ }
+ return false;
+ }
+ /*
+ * The string should have the correct byte length and not finish with the
+ * separator
+ */
+ return (digit_count == (2 * NGUID_LEN)) && (str[i - 1] != NGUID_SEPARATOR);
+}
+
+static int nvme_nguid_parse(const char *str, NvmeNGUID *nguid)
+{
+ uint8_t *id = &nguid->data[0];
+ int ret = 0;
+ int i;
+ const char *ptr = str;
+
+ if (!nvme_nguid_is_valid(str)) {
+ return -1;
+ }
+
+ for (i = 0; i < NGUID_LEN; i++) {
+ ret = sscanf(ptr, "%02hhx", &id[i]);
+ if (ret != 1) {
+ return -1;
+ }
+ ptr += 2;
+ if (*ptr == NGUID_SEPARATOR) {
+ ptr++;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * When converted back to string this implementation will use a raw hex number
+ * with no separators, for instance:
+ *
+ * "e9accd3b83904e13167cf0593437f57d"
+ */
+static void nvme_nguid_stringify(const NvmeNGUID *nguid, char *out)
+{
+ const uint8_t *id = &nguid->data[0];
+ snprintf(out, NGUID_STR_LEN, NGUID_FMT,
+ id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7],
+ id[8], id[9], id[10], id[11], id[12], id[13], id[14], id[15]);
+}
+
+static void get_nguid(Object *obj, Visitor *v, const char *name, void *opaque,
+ Error **errp)
+{
+ Property *prop = opaque;
+ NvmeNGUID *nguid = object_field_prop_ptr(obj, prop);
+ char buffer[NGUID_STR_LEN];
+ char *p = buffer;
+
+ nvme_nguid_stringify(nguid, buffer);
+
+ visit_type_str(v, name, &p, errp);
+}
+
+static void set_nguid(Object *obj, Visitor *v, const char *name, void *opaque,
+ Error **errp)
+{
+ Property *prop = opaque;
+ NvmeNGUID *nguid = object_field_prop_ptr(obj, prop);
+ char *str;
+
+ if (!visit_type_str(v, name, &str, errp)) {
+ return;
+ }
+
+ if (!strcmp(str, NGUID_VALUE_AUTO)) {
+ nvme_nguid_generate(nguid);
+ } else if (nvme_nguid_parse(str, nguid) < 0) {
+ error_set_from_qdev_prop_error(errp, EINVAL, obj, name, str);
+ }
+ g_free(str);
+}
+
+const PropertyInfo qdev_prop_nguid = {
+ .name = "str",
+ .description =
+ "NGUID or \"" NGUID_VALUE_AUTO "\" for random value",
+ .get = get_nguid,
+ .set = set_nguid,
+};
diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
index 0eabcf5cf500..ea8db175dbd1 100644
--- a/hw/nvme/ns.c
+++ b/hw/nvme/ns.c
@@ -89,6 +89,7 @@ static int nvme_ns_init(NvmeNamespace *ns, Error **errp)
id_ns->mcl = cpu_to_le32(ns->params.mcl);
id_ns->msrc = ns->params.msrc;
id_ns->eui64 = cpu_to_be64(ns->params.eui64);
+ memcpy(&id_ns->nguid, &ns->params.nguid.data, sizeof(id_ns->nguid));
ds = 31 - clz32(ns->blkconf.logical_block_size);
ms = ns->params.ms;
@@ -797,6 +798,7 @@ static Property nvme_ns_props[] = {
DEFINE_PROP_BOOL("shared", NvmeNamespace, params.shared, true),
DEFINE_PROP_UINT32("nsid", NvmeNamespace, params.nsid, 0),
DEFINE_PROP_UUID_NODEFAULT("uuid", NvmeNamespace, params.uuid),
+ DEFINE_PROP_NGUID_NODEFAULT("nguid", NvmeNamespace, params.nguid),
DEFINE_PROP_UINT64("eui64", NvmeNamespace, params.eui64, 0),
DEFINE_PROP_UINT16("ms", NvmeNamespace, params.ms, 0),
DEFINE_PROP_UINT8("mset", NvmeNamespace, params.mset, 0),
diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h
index 5f2ae7b28b9c..392c02942682 100644
--- a/hw/nvme/nvme.h
+++ b/hw/nvme/nvme.h
@@ -171,13 +171,27 @@ static const uint8_t nvme_fdp_evf_shifts[FDP_EVT_MAX] = {
[FDP_EVT_RUH_IMPLICIT_RU_CHANGE] = 33,
};
+#define NGUID_LEN 16
+
+typedef struct {
+ uint8_t data[NGUID_LEN];
+} NvmeNGUID;
+
+bool nvme_nguid_is_null(const NvmeNGUID *nguid);
+
+extern const PropertyInfo qdev_prop_nguid;
+
+#define DEFINE_PROP_NGUID_NODEFAULT(_name, _state, _field) \
+ DEFINE_PROP(_name, _state, _field, qdev_prop_nguid, NvmeNGUID)
+
typedef struct NvmeNamespaceParams {
- bool detached;
- bool shared;
- uint32_t nsid;
- QemuUUID uuid;
- uint64_t eui64;
- bool eui64_default;
+ bool detached;
+ bool shared;
+ uint32_t nsid;
+ QemuUUID uuid;
+ NvmeNGUID nguid;
+ uint64_t eui64;
+ bool eui64_default;
uint16_t ms;
uint8_t mset;
--
2.44.0
