sfc: add devlink info support for ef100

Add devlink info support for ef100. The information reported is obtained
through the MCDI interface with the specific meaning defined in new
documentation file.

Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@amd.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

4 files changed, 549 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/efx_devlink.c b/drivers/net/ethernet/sfc/efx_devlink.c
index 10c96a9d6f3c..76d54048beda 100644
--- a/drivers/net/ethernet/sfc/efx_devlink.c
+++ b/drivers/net/ethernet/sfc/efx_devlink.c
@@ -10,12 +10,469 @@
 
 #include "net_driver.h"
 #include "efx_devlink.h"
+#include <linux/rtc.h>
+#include "mcdi.h"
+#include "mcdi_functions.h"
+#include "mcdi_pcol.h"
 
 struct efx_devlink {
 	struct efx_nic *efx;
 };
 
+static int efx_devlink_info_nvram_partition(struct efx_nic *efx,
+					    struct devlink_info_req *req,
+					    unsigned int partition_type,
+					    const char *version_name)
+{
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	u16 version[4];
+	int rc;
+
+	rc = efx_mcdi_nvram_metadata(efx, partition_type, NULL, version, NULL,
+				     0);
+	if (rc) {
+		netif_err(efx, drv, efx->net_dev, "mcdi nvram %s: failed\n",
+			  version_name);
+		return rc;
+	}
+
+	snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u", version[0],
+		 version[1], version[2], version[3]);
+	devlink_info_version_stored_put(req, version_name, buf);
+
+	return 0;
+}
+
+static int efx_devlink_info_stored_versions(struct efx_nic *efx,
+					    struct devlink_info_req *req)
+{
+	int rc;
+
+	rc = efx_devlink_info_nvram_partition(efx, req,
+					      NVRAM_PARTITION_TYPE_BUNDLE,
+					      DEVLINK_INFO_VERSION_GENERIC_FW_BUNDLE_ID);
+	if (rc)
+		return rc;
+
+	rc = efx_devlink_info_nvram_partition(efx, req,
+					      NVRAM_PARTITION_TYPE_MC_FIRMWARE,
+					      DEVLINK_INFO_VERSION_GENERIC_FW_MGMT);
+	if (rc)
+		return rc;
+
+	rc = efx_devlink_info_nvram_partition(efx, req,
+					      NVRAM_PARTITION_TYPE_SUC_FIRMWARE,
+					      EFX_DEVLINK_INFO_VERSION_FW_MGMT_SUC);
+	if (rc)
+		return rc;
+
+	rc = efx_devlink_info_nvram_partition(efx, req,
+					      NVRAM_PARTITION_TYPE_EXPANSION_ROM,
+					      EFX_DEVLINK_INFO_VERSION_FW_EXPROM);
+	if (rc)
+		return rc;
+
+	rc = efx_devlink_info_nvram_partition(efx, req,
+					      NVRAM_PARTITION_TYPE_EXPANSION_UEFI,
+					      EFX_DEVLINK_INFO_VERSION_FW_UEFI);
+	return rc;
+}
+
+#define EFX_VER_FLAG(_f)	\
+	(MC_CMD_GET_VERSION_V5_OUT_ ## _f ## _PRESENT_LBN)
+
+static void efx_devlink_info_running_v2(struct efx_nic *efx,
+					struct devlink_info_req *req,
+					unsigned int flags, efx_dword_t *outbuf)
+{
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	union {
+		const __le32 *dwords;
+		const __le16 *words;
+		const char *str;
+	} ver;
+	struct rtc_time build_date;
+	unsigned int build_id;
+	size_t offset;
+	__maybe_unused u64 tstamp;
+
+	if (flags & BIT(EFX_VER_FLAG(BOARD_EXT_INFO))) {
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%s",
+			 MCDI_PTR(outbuf, GET_VERSION_V2_OUT_BOARD_NAME));
+		devlink_info_version_fixed_put(req,
+					       DEVLINK_INFO_VERSION_GENERIC_BOARD_ID,
+					       buf);
+
+		/* Favour full board version if present (in V5 or later) */
+		if (~flags & BIT(EFX_VER_FLAG(BOARD_VERSION))) {
+			snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u",
+				 MCDI_DWORD(outbuf,
+					    GET_VERSION_V2_OUT_BOARD_REVISION));
+			devlink_info_version_fixed_put(req,
+						       DEVLINK_INFO_VERSION_GENERIC_BOARD_REV,
+						       buf);
+		}
+
+		ver.str = MCDI_PTR(outbuf, GET_VERSION_V2_OUT_BOARD_SERIAL);
+		if (ver.str[0])
+			devlink_info_board_serial_number_put(req, ver.str);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(FPGA_EXT_INFO))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V2_OUT_FPGA_VERSION);
+		offset = snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u_%c%u",
+				  le32_to_cpu(ver.dwords[0]),
+				  'A' + le32_to_cpu(ver.dwords[1]),
+				  le32_to_cpu(ver.dwords[2]));
+
+		ver.str = MCDI_PTR(outbuf, GET_VERSION_V2_OUT_FPGA_EXTRA);
+		if (ver.str[0])
+			snprintf(&buf[offset], EFX_MAX_VERSION_INFO_LEN - offset,
+				 " (%s)", ver.str);
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_FPGA_REV,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(CMC_EXT_INFO))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V2_OUT_CMCFW_VERSION);
+		offset = snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+				  le32_to_cpu(ver.dwords[0]),
+				  le32_to_cpu(ver.dwords[1]),
+				  le32_to_cpu(ver.dwords[2]),
+				  le32_to_cpu(ver.dwords[3]));
+
+#ifdef CONFIG_RTC_LIB
+		tstamp = MCDI_QWORD(outbuf,
+				    GET_VERSION_V2_OUT_CMCFW_BUILD_DATE);
+		if (tstamp) {
+			rtc_time64_to_tm(tstamp, &build_date);
+			snprintf(&buf[offset], EFX_MAX_VERSION_INFO_LEN - offset,
+				 " (%ptRd)", &build_date);
+		}
+#endif
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_FW_MGMT_CMC,
+						 buf);
+	}
+
+	ver.words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_V2_OUT_VERSION);
+	offset = snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			  le16_to_cpu(ver.words[0]), le16_to_cpu(ver.words[1]),
+			  le16_to_cpu(ver.words[2]), le16_to_cpu(ver.words[3]));
+	if (flags & BIT(EFX_VER_FLAG(MCFW_EXT_INFO))) {
+		build_id = MCDI_DWORD(outbuf, GET_VERSION_V2_OUT_MCFW_BUILD_ID);
+		snprintf(&buf[offset], EFX_MAX_VERSION_INFO_LEN - offset,
+			 " (%x) %s", build_id,
+			 MCDI_PTR(outbuf, GET_VERSION_V2_OUT_MCFW_BUILD_NAME));
+	}
+	devlink_info_version_running_put(req,
+					 DEVLINK_INFO_VERSION_GENERIC_FW_MGMT,
+					 buf);
+
+	if (flags & BIT(EFX_VER_FLAG(SUCFW_EXT_INFO))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V2_OUT_SUCFW_VERSION);
+#ifdef CONFIG_RTC_LIB
+		tstamp = MCDI_QWORD(outbuf,
+				    GET_VERSION_V2_OUT_SUCFW_BUILD_DATE);
+		rtc_time64_to_tm(tstamp, &build_date);
+#else
+		memset(&build_date, 0, sizeof(build_date)
+#endif
+		build_id = MCDI_DWORD(outbuf, GET_VERSION_V2_OUT_SUCFW_CHIP_ID);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN,
+			 "%u.%u.%u.%u type %x (%ptRd)",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]), le32_to_cpu(ver.dwords[3]),
+			 build_id, &build_date);
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_FW_MGMT_SUC,
+						 buf);
+	}
+}
+
+static void efx_devlink_info_running_v3(struct efx_nic *efx,
+					struct devlink_info_req *req,
+					unsigned int flags, efx_dword_t *outbuf)
+{
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	union {
+		const __le32 *dwords;
+		const __le16 *words;
+		const char *str;
+	} ver;
+
+	if (flags & BIT(EFX_VER_FLAG(DATAPATH_HW_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V3_OUT_DATAPATH_HW_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_DATAPATH_HW,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(DATAPATH_FW_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V3_OUT_DATAPATH_FW_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_DATAPATH_FW,
+						 buf);
+	}
+}
+
+static void efx_devlink_info_running_v4(struct efx_nic *efx,
+					struct devlink_info_req *req,
+					unsigned int flags, efx_dword_t *outbuf)
+{
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	union {
+		const __le32 *dwords;
+		const __le16 *words;
+		const char *str;
+	} ver;
+
+	if (flags & BIT(EFX_VER_FLAG(SOC_BOOT_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V4_OUT_SOC_BOOT_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_SOC_BOOT,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(SOC_UBOOT_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V4_OUT_SOC_UBOOT_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_SOC_UBOOT,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(SOC_MAIN_ROOTFS_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+					GET_VERSION_V4_OUT_SOC_MAIN_ROOTFS_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_SOC_MAIN,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(SOC_RECOVERY_BUILDROOT_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V4_OUT_SOC_RECOVERY_BUILDROOT_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_SOC_RECOVERY,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(SUCFW_VERSION)) &&
+	    ~flags & BIT(EFX_VER_FLAG(SUCFW_EXT_INFO))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V4_OUT_SUCFW_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 EFX_DEVLINK_INFO_VERSION_FW_MGMT_SUC,
+						 buf);
+	}
+}
+
+static void efx_devlink_info_running_v5(struct efx_nic *efx,
+					struct devlink_info_req *req,
+					unsigned int flags, efx_dword_t *outbuf)
+{
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	union {
+		const __le32 *dwords;
+		const __le16 *words;
+		const char *str;
+	} ver;
+
+	if (flags & BIT(EFX_VER_FLAG(BOARD_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V5_OUT_BOARD_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 DEVLINK_INFO_VERSION_GENERIC_BOARD_REV,
+						 buf);
+	}
+
+	if (flags & BIT(EFX_VER_FLAG(BUNDLE_VERSION))) {
+		ver.dwords = (__le32 *)MCDI_PTR(outbuf,
+						GET_VERSION_V5_OUT_BUNDLE_VERSION);
+
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le32_to_cpu(ver.dwords[0]), le32_to_cpu(ver.dwords[1]),
+			 le32_to_cpu(ver.dwords[2]),
+			 le32_to_cpu(ver.dwords[3]));
+
+		devlink_info_version_running_put(req,
+						 DEVLINK_INFO_VERSION_GENERIC_FW_BUNDLE_ID,
+						 buf);
+	}
+}
+
+static int efx_devlink_info_running_versions(struct efx_nic *efx,
+					     struct devlink_info_req *req)
+{
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_VERSION_V5_OUT_LEN);
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_VERSION_EXT_IN_LEN);
+	char buf[EFX_MAX_VERSION_INFO_LEN];
+	union {
+		const __le32 *dwords;
+		const __le16 *words;
+		const char *str;
+	} ver;
+	size_t outlength;
+	unsigned int flags;
+	int rc;
+
+	rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, inbuf, sizeof(inbuf),
+			  outbuf, sizeof(outbuf), &outlength);
+	if (rc || outlength < MC_CMD_GET_VERSION_OUT_LEN) {
+		netif_err(efx, drv, efx->net_dev,
+			  "mcdi MC_CMD_GET_VERSION failed\n");
+		return rc;
+	}
+
+	/* Handle previous output */
+	if (outlength < MC_CMD_GET_VERSION_V2_OUT_LEN) {
+		ver.words = (__le16 *)MCDI_PTR(outbuf,
+					       GET_VERSION_EXT_OUT_VERSION);
+		snprintf(buf, EFX_MAX_VERSION_INFO_LEN, "%u.%u.%u.%u",
+			 le16_to_cpu(ver.words[0]),
+			 le16_to_cpu(ver.words[1]),
+			 le16_to_cpu(ver.words[2]),
+			 le16_to_cpu(ver.words[3]));
+
+		devlink_info_version_running_put(req,
+						 DEVLINK_INFO_VERSION_GENERIC_FW_MGMT,
+						 buf);
+		return 0;
+	}
+
+	/* Handle V2 additions */
+	flags = MCDI_DWORD(outbuf, GET_VERSION_V2_OUT_FLAGS);
+	efx_devlink_info_running_v2(efx, req, flags, outbuf);
+
+	if (outlength < MC_CMD_GET_VERSION_V3_OUT_LEN)
+		return 0;
+
+	/* Handle V3 additions */
+	efx_devlink_info_running_v3(efx, req, flags, outbuf);
+
+	if (outlength < MC_CMD_GET_VERSION_V4_OUT_LEN)
+		return 0;
+
+	/* Handle V4 additions */
+	efx_devlink_info_running_v4(efx, req, flags, outbuf);
+
+	if (outlength < MC_CMD_GET_VERSION_V5_OUT_LEN)
+		return 0;
+
+	/* Handle V5 additions */
+	efx_devlink_info_running_v5(efx, req, flags, outbuf);
+
+	return 0;
+}
+
+#define EFX_MAX_SERIALNUM_LEN	(ETH_ALEN * 2 + 1)
+
+static int efx_devlink_info_board_cfg(struct efx_nic *efx,
+				      struct devlink_info_req *req)
+{
+	char sn[EFX_MAX_SERIALNUM_LEN];
+	u8 mac_address[ETH_ALEN];
+	int rc;
+
+	rc = efx_mcdi_get_board_cfg(efx, (u8 *)mac_address, NULL, NULL);
+	if (!rc) {
+		snprintf(sn, EFX_MAX_SERIALNUM_LEN, "%pm", mac_address);
+		devlink_info_serial_number_put(req, sn);
+	}
+	return rc;
+}
+
+static int efx_devlink_info_get(struct devlink *devlink,
+				struct devlink_info_req *req,
+				struct netlink_ext_ack *extack)
+{
+	struct efx_devlink *devlink_private = devlink_priv(devlink);
+	struct efx_nic *efx = devlink_private->efx;
+	int rc;
+
+	/* Several different MCDI commands are used. We report first error
+	 * through extack returning at that point. Specific error
+	 * information via system messages.
+	 */
+	rc = efx_devlink_info_board_cfg(efx, req);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Getting board info failed");
+		return rc;
+	}
+	rc = efx_devlink_info_stored_versions(efx, req);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Getting stored versions failed");
+		return rc;
+	}
+	rc = efx_devlink_info_running_versions(efx, req);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Getting running versions failed");
+		return rc;
+	}
+
+	return 0;
+}
+
 static const struct devlink_ops sfc_devlink_ops = {
+	.info_get			= efx_devlink_info_get,
 };
 
 void efx_fini_devlink_lock(struct efx_nic *efx)
diff --git a/drivers/net/ethernet/sfc/efx_devlink.h b/drivers/net/ethernet/sfc/efx_devlink.h
index 8ff85b035e87..a5269361c3e0 100644
--- a/drivers/net/ethernet/sfc/efx_devlink.h
+++ b/drivers/net/ethernet/sfc/efx_devlink.h
@@ -14,6 +14,23 @@
 #include "net_driver.h"
 #include <net/devlink.h>
 
+/* Custom devlink-info version object names for details that do not map to the
+ * generic standardized names.
+ */
+#define EFX_DEVLINK_INFO_VERSION_FW_MGMT_SUC	"fw.mgmt.suc"
+#define EFX_DEVLINK_INFO_VERSION_FW_MGMT_CMC	"fw.mgmt.cmc"
+#define EFX_DEVLINK_INFO_VERSION_FPGA_REV	"fpga.rev"
+#define EFX_DEVLINK_INFO_VERSION_DATAPATH_HW	"fpga.app"
+#define EFX_DEVLINK_INFO_VERSION_DATAPATH_FW	DEVLINK_INFO_VERSION_GENERIC_FW_APP
+#define EFX_DEVLINK_INFO_VERSION_SOC_BOOT	"coproc.boot"
+#define EFX_DEVLINK_INFO_VERSION_SOC_UBOOT	"coproc.uboot"
+#define EFX_DEVLINK_INFO_VERSION_SOC_MAIN	"coproc.main"
+#define EFX_DEVLINK_INFO_VERSION_SOC_RECOVERY	"coproc.recovery"
+#define EFX_DEVLINK_INFO_VERSION_FW_EXPROM	"fw.exprom"
+#define EFX_DEVLINK_INFO_VERSION_FW_UEFI	"fw.uefi"
+
+#define EFX_MAX_VERSION_INFO_LEN	64
+
 int efx_probe_devlink_and_lock(struct efx_nic *efx);
 void efx_probe_devlink_unlock(struct efx_nic *efx);
 void efx_fini_devlink_lock(struct efx_nic *efx);
diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c
index af338208eae9..a7f2c31071e8 100644
--- a/drivers/net/ethernet/sfc/mcdi.c
+++ b/drivers/net/ethernet/sfc/mcdi.c
@@ -2175,6 +2175,78 @@ int efx_mcdi_get_privilege_mask(struct efx_nic *efx, u32 *mask)
 	return 0;
 }
 
+int efx_mcdi_nvram_metadata(struct efx_nic *efx, unsigned int type,
+			    u32 *subtype, u16 version[4], char *desc,
+			    size_t descsize)
+{
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_METADATA_IN_LEN);
+	efx_dword_t *outbuf;
+	size_t outlen;
+	u32 flags;
+	int rc;
+
+	outbuf = kzalloc(MC_CMD_NVRAM_METADATA_OUT_LENMAX_MCDI2, GFP_KERNEL);
+	if (!outbuf)
+		return -ENOMEM;
+
+	MCDI_SET_DWORD(inbuf, NVRAM_METADATA_IN_TYPE, type);
+
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_NVRAM_METADATA, inbuf,
+				sizeof(inbuf), outbuf,
+				MC_CMD_NVRAM_METADATA_OUT_LENMAX_MCDI2,
+				&outlen);
+	if (rc)
+		goto out_free;
+	if (outlen < MC_CMD_NVRAM_METADATA_OUT_LENMIN) {
+		rc = -EIO;
+		goto out_free;
+	}
+
+	flags = MCDI_DWORD(outbuf, NVRAM_METADATA_OUT_FLAGS);
+
+	if (desc && descsize > 0) {
+		if (flags & BIT(MC_CMD_NVRAM_METADATA_OUT_DESCRIPTION_VALID_LBN)) {
+			if (descsize <=
+			    MC_CMD_NVRAM_METADATA_OUT_DESCRIPTION_NUM(outlen)) {
+				rc = -E2BIG;
+				goto out_free;
+			}
+
+			strncpy(desc,
+				MCDI_PTR(outbuf, NVRAM_METADATA_OUT_DESCRIPTION),
+				MC_CMD_NVRAM_METADATA_OUT_DESCRIPTION_NUM(outlen));
+			desc[MC_CMD_NVRAM_METADATA_OUT_DESCRIPTION_NUM(outlen)] = '\0';
+		} else {
+			desc[0] = '\0';
+		}
+	}
+
+	if (subtype) {
+		if (flags & BIT(MC_CMD_NVRAM_METADATA_OUT_SUBTYPE_VALID_LBN))
+			*subtype = MCDI_DWORD(outbuf, NVRAM_METADATA_OUT_SUBTYPE);
+		else
+			*subtype = 0;
+	}
+
+	if (version) {
+		if (flags & BIT(MC_CMD_NVRAM_METADATA_OUT_VERSION_VALID_LBN)) {
+			version[0] = MCDI_WORD(outbuf, NVRAM_METADATA_OUT_VERSION_W);
+			version[1] = MCDI_WORD(outbuf, NVRAM_METADATA_OUT_VERSION_X);
+			version[2] = MCDI_WORD(outbuf, NVRAM_METADATA_OUT_VERSION_Y);
+			version[3] = MCDI_WORD(outbuf, NVRAM_METADATA_OUT_VERSION_Z);
+		} else {
+			version[0] = 0;
+			version[1] = 0;
+			version[2] = 0;
+			version[3] = 0;
+		}
+	}
+
+out_free:
+	kfree(outbuf);
+	return rc;
+}
+
 #ifdef CONFIG_SFC_MTD
 
 #define EFX_MCDI_NVRAM_LEN_MAX 128
diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h
index 7e35fec9da35..5cb202684858 100644
--- a/drivers/net/ethernet/sfc/mcdi.h
+++ b/drivers/net/ethernet/sfc/mcdi.h
@@ -378,6 +378,9 @@ int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
 			size_t *size_out, size_t *erase_size_out,
 			bool *protected_out);
 int efx_new_mcdi_nvram_test_all(struct efx_nic *efx);
+int efx_mcdi_nvram_metadata(struct efx_nic *efx, unsigned int type,
+			    u32 *subtype, u16 version[4], char *desc,
+			    size_t descsize);
 int efx_mcdi_nvram_test_all(struct efx_nic *efx);
 int efx_mcdi_handle_assertion(struct efx_nic *efx);
 int efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode);