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nvmem: layouts: onie-tlv: Add new layout driver
This layout applies on top of any non volatile storage device containing an ONIE table factory flashed. This table follows the tlv (type-length-value) organization described in the link below. We cannot afford using regular parsers because the content of these tables is manufacturer specific and must be dynamically discovered. Link: https://opencomputeproject.github.io/onie/design-spec/hw_requirements.html Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20230404172148.82422-24-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miquel Raynal
Greg Kroah-Hartman
parent
fe191489d6
commit
d3c0d12f64
@ -11,4 +11,13 @@ config NVMEM_LAYOUT_SL28_VPD
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If unsure, say N.
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config NVMEM_LAYOUT_ONIE_TLV
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tristate "ONIE tlv support"
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select CRC32
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help
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Say Y here if you want to support the Open Compute Project ONIE
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Type-Length-Value standard table.
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If unsure, say N.
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endmenu
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@ -4,3 +4,4 @@
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#
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obj-$(CONFIG_NVMEM_LAYOUT_SL28_VPD) += sl28vpd.o
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obj-$(CONFIG_NVMEM_LAYOUT_ONIE_TLV) += onie-tlv.o
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257
drivers/nvmem/layouts/onie-tlv.c
Normal file
257
drivers/nvmem/layouts/onie-tlv.c
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@ -0,0 +1,257 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ONIE tlv NVMEM cells provider
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*
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* Copyright (C) 2022 Open Compute Group ONIE
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* Author: Miquel Raynal <miquel.raynal@bootlin.com>
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* Based on the nvmem driver written by: Vadym Kochan <vadym.kochan@plvision.eu>
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* Inspired by the first layout written by: Rafał Miłecki <rafal@milecki.pl>
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*/
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#include <linux/crc32.h>
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#include <linux/etherdevice.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of.h>
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#define ONIE_TLV_MAX_LEN 2048
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#define ONIE_TLV_CRC_FIELD_SZ 6
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#define ONIE_TLV_CRC_SZ 4
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#define ONIE_TLV_HDR_ID "TlvInfo"
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struct onie_tlv_hdr {
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u8 id[8];
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u8 version;
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__be16 data_len;
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} __packed;
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struct onie_tlv {
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u8 type;
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u8 len;
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} __packed;
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static const char *onie_tlv_cell_name(u8 type)
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{
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switch (type) {
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case 0x21:
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return "product-name";
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case 0x22:
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return "part-number";
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case 0x23:
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return "serial-number";
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case 0x24:
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return "mac-address";
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case 0x25:
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return "manufacture-date";
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case 0x26:
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return "device-version";
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case 0x27:
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return "label-revision";
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case 0x28:
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return "platform-name";
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case 0x29:
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return "onie-version";
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case 0x2A:
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return "num-macs";
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case 0x2B:
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return "manufacturer";
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case 0x2C:
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return "country-code";
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case 0x2D:
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return "vendor";
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case 0x2E:
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return "diag-version";
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case 0x2F:
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return "service-tag";
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case 0xFD:
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return "vendor-extension";
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case 0xFE:
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return "crc32";
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default:
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break;
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}
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return NULL;
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}
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static int onie_tlv_mac_read_cb(void *priv, const char *id, int index,
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unsigned int offset, void *buf,
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size_t bytes)
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{
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eth_addr_add(buf, index);
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return 0;
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}
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static nvmem_cell_post_process_t onie_tlv_read_cb(u8 type, u8 *buf)
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{
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switch (type) {
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case 0x24:
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return &onie_tlv_mac_read_cb;
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default:
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break;
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}
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return NULL;
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}
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static int onie_tlv_add_cells(struct device *dev, struct nvmem_device *nvmem,
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size_t data_len, u8 *data)
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{
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struct nvmem_cell_info cell = {};
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struct device_node *layout;
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struct onie_tlv tlv;
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unsigned int hdr_len = sizeof(struct onie_tlv_hdr);
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unsigned int offset = 0;
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int ret;
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layout = of_nvmem_layout_get_container(nvmem);
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if (!layout)
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return -ENOENT;
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while (offset < data_len) {
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memcpy(&tlv, data + offset, sizeof(tlv));
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if (offset + tlv.len >= data_len) {
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dev_err(dev, "Out of bounds field (0x%x bytes at 0x%x)\n",
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tlv.len, hdr_len + offset);
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break;
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}
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cell.name = onie_tlv_cell_name(tlv.type);
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if (!cell.name)
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continue;
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cell.offset = hdr_len + offset + sizeof(tlv.type) + sizeof(tlv.len);
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cell.bytes = tlv.len;
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cell.np = of_get_child_by_name(layout, cell.name);
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cell.read_post_process = onie_tlv_read_cb(tlv.type, data + offset + sizeof(tlv));
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ret = nvmem_add_one_cell(nvmem, &cell);
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if (ret) {
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of_node_put(layout);
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return ret;
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}
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offset += sizeof(tlv) + tlv.len;
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}
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of_node_put(layout);
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return 0;
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}
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static bool onie_tlv_hdr_is_valid(struct device *dev, struct onie_tlv_hdr *hdr)
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{
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if (memcmp(hdr->id, ONIE_TLV_HDR_ID, sizeof(hdr->id))) {
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dev_err(dev, "Invalid header\n");
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return false;
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}
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if (hdr->version != 0x1) {
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dev_err(dev, "Invalid version number\n");
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return false;
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}
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return true;
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}
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static bool onie_tlv_crc_is_valid(struct device *dev, size_t table_len, u8 *table)
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{
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struct onie_tlv crc_hdr;
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u32 read_crc, calc_crc;
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__be32 crc_be;
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memcpy(&crc_hdr, table + table_len - ONIE_TLV_CRC_FIELD_SZ, sizeof(crc_hdr));
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if (crc_hdr.type != 0xfe || crc_hdr.len != ONIE_TLV_CRC_SZ) {
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dev_err(dev, "Invalid CRC field\n");
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return false;
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}
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/* The table contains a JAMCRC, which is XOR'ed compared to the original
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* CRC32 implementation as known in the Ethernet world.
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*/
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memcpy(&crc_be, table + table_len - ONIE_TLV_CRC_SZ, ONIE_TLV_CRC_SZ);
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read_crc = be32_to_cpu(crc_be);
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calc_crc = crc32(~0, table, table_len - ONIE_TLV_CRC_SZ) ^ 0xFFFFFFFF;
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if (read_crc != calc_crc) {
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dev_err(dev, "Invalid CRC read: 0x%08x, expected: 0x%08x\n",
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read_crc, calc_crc);
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return false;
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}
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return true;
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}
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static int onie_tlv_parse_table(struct device *dev, struct nvmem_device *nvmem,
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struct nvmem_layout *layout)
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{
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struct onie_tlv_hdr hdr;
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size_t table_len, data_len, hdr_len;
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u8 *table, *data;
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int ret;
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ret = nvmem_device_read(nvmem, 0, sizeof(hdr), &hdr);
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if (ret < 0)
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return ret;
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if (!onie_tlv_hdr_is_valid(dev, &hdr)) {
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dev_err(dev, "Invalid ONIE TLV header\n");
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return -EINVAL;
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}
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hdr_len = sizeof(hdr.id) + sizeof(hdr.version) + sizeof(hdr.data_len);
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data_len = be16_to_cpu(hdr.data_len);
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table_len = hdr_len + data_len;
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if (table_len > ONIE_TLV_MAX_LEN) {
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dev_err(dev, "Invalid ONIE TLV data length\n");
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return -EINVAL;
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}
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table = devm_kmalloc(dev, table_len, GFP_KERNEL);
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if (!table)
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return -ENOMEM;
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ret = nvmem_device_read(nvmem, 0, table_len, table);
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if (ret != table_len)
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return ret;
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if (!onie_tlv_crc_is_valid(dev, table_len, table))
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return -EINVAL;
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data = table + hdr_len;
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ret = onie_tlv_add_cells(dev, nvmem, data_len, data);
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if (ret)
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return ret;
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return 0;
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}
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static const struct of_device_id onie_tlv_of_match_table[] = {
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{ .compatible = "onie,tlv-layout", },
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{},
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};
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MODULE_DEVICE_TABLE(of, onie_tlv_of_match_table);
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static struct nvmem_layout onie_tlv_layout = {
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.name = "ONIE tlv layout",
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.of_match_table = onie_tlv_of_match_table,
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.add_cells = onie_tlv_parse_table,
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};
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static int __init onie_tlv_init(void)
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{
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return nvmem_layout_register(&onie_tlv_layout);
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}
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static void __exit onie_tlv_exit(void)
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{
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nvmem_layout_unregister(&onie_tlv_layout);
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}
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module_init(onie_tlv_init);
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module_exit(onie_tlv_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>");
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MODULE_DESCRIPTION("NVMEM layout driver for Onie TLV table parsing");
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MODULE_ALIAS("NVMEM layout driver for Onie TLV table parsing");
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