CDB (Command Data Block Message Communication) reads and writes are
performed on memory map pages 9Fh-AFh according to the CMIS standard,
section 8.20 of revision 5.2.
Page 9Fh is used to specify the CDB command to be executed and also
provides an area for a local payload (LPL).
According to the CMIS standard, the firmware update process is done using
a CDB commands sequence that will be implemented in the next patch.
The kernel interface that will implement the firmware update using CDB
command will include 2 layers that will be added under ethtool:
* The upper layer that will be triggered from the module layer, is
cmis_fw_update.
* The lower one is cmis_cdb.
In the future there might be more operations to implement using CDB
commands. Therefore, the idea is to keep the CDB interface clean and the
cmis_fw_update specific to the CDB commands handling it.
These two layers will communicate using the API the consists of three
functions:
- struct ethtool_cmis_cdb *
ethtool_cmis_cdb_init(struct net_device *dev,
struct ethtool_module_fw_flash_params *params);
- void ethtool_cmis_cdb_fini(struct ethtool_cmis_cdb *cdb);
- int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
struct ethtool_cmis_cdb_cmd_args *args);
Add the CDB layer to support initializing, finishing and executing CDB
commands:
* The initialization process will include creating of an ethtool_cmis_cdb
instance, querying the module CDB support, entering and validating the
password from user space (CMD 0x0000) and querying the module features
(CMD 0x0040).
* The finishing API will simply free the ethtool_cmis_cdb instance.
* The executing process will write the CDB command to EEPROM using
set_module_eeprom_by_page() that was presented earlier, and will
process the reply from EEPROM.
Signed-off-by: Danielle Ratson <danieller@xxxxxxxxxx>
---
net/ethtool/Makefile | 2 +-
net/ethtool/cmis.h | 114 +++++++++
net/ethtool/cmis_cdb.c | 549 ++++++++++++++++++++++++++++++++++++++++
net/ethtool/module_fw.h | 10 +
4 files changed, 674 insertions(+), 1 deletion(-)
create mode 100644 net/ethtool/cmis.h
create mode 100644 net/ethtool/cmis_cdb.c
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 504f954a1b28..38806b3ecf83 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -8,4 +8,4 @@ ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.o \
linkstate.o debug.o wol.o features.o privflags.o rings.o \
channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \
tunnels.o fec.o eeprom.o stats.o phc_vclocks.o mm.o \
- module.o pse-pd.o plca.o mm.o
+ module.o cmis_cdb.o pse-pd.o plca.o mm.o
diff --git a/net/ethtool/cmis.h b/net/ethtool/cmis.h
new file mode 100644
index 000000000000..926fc2320f07
--- /dev/null
+++ b/net/ethtool/cmis.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH 120
+#define ETHTOOL_CMIS_CDB_CMD_PAGE 0x9F
+#define ETHTOOL_CMIS_CDB_PAGE_I2C_ADDR 0x50
+
+/**
+ * struct ethtool_cmis_cdb - CDB commands parameters
+ * @cmis_rev: CMIS revision major.
+ * @read_write_len_ext: Allowable additional number of byte octets to the LPL
+ * in a READ or a WRITE CDB commands.
+ * @max_completion_time: Maximum CDB command completion time in msec.
+ */
+struct ethtool_cmis_cdb {
+ u8 cmis_rev;
+ u8 read_write_len_ext;
+ u16 max_completion_time;
+};
+
+enum ethtool_cmis_cdb_cmd_id {
+ ETHTOOL_CMIS_CDB_CMD_QUERY_STATUS = 0x0000,
+ ETHTOOL_CMIS_CDB_CMD_MODULE_FEATURES = 0x0040,
+};
+
+/**
+ * struct ethtool_cmis_cdb_request - CDB commands request fields as decribed in
+ * the CMIS standard
+ * @id: Command ID.
+ * @epl_len: EPL memory length.
+ * @lpl_len: LPL memory length.
+ * @chk_code: Check code for the previous field and the payload.
+ * @resv1: Added to match the CMIS standard request continuity.
+ * @resv2: Added to match the CMIS standard request continuity.
+ * @payload: Payload for the CDB commands.
+ */
+struct ethtool_cmis_cdb_request {
+ __be16 id;
+ struct_group(body,
+ u16 epl_len;
+ u8 lpl_len;
+ u8 chk_code;
+ u8 resv1;
+ u8 resv2;
+ u8 payload[ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH];
+ );
+};
+
+#define CDB_F_COMPLETION_VALID BIT(0)
+#define CDB_F_STATUS_VALID BIT(1)
+
+/**
+ * struct ethtool_cmis_cdb_cmd_args - CDB commands execution arguments
+ * @req: CDB command fields as described in the CMIS standard.
+ * @max_duration: Maximum duration time for command completion in msec.
+ * @read_write_len_ext: Allowable additional number of byte octets to the LPL
+ * in a READ or a WRITE commands.
+ * @rpl_exp_len: Expected reply length in bytes.
+ * @flags: Validation flags for CDB commands.
+ */
+struct ethtool_cmis_cdb_cmd_args {
+ struct ethtool_cmis_cdb_request req;
+ u16 max_duration;
+ u8 read_write_len_ext;
+ u8 msleep_pre_rpl;
+ u8 rpl_exp_len;
+ u8 flags;
+ char *err_msg;
+};
+
+/**
+ * struct ethtool_cmis_cdb_rpl_hdr - CDB commands reply header arguments
+ * @rpl_len: Reply length.
+ * @rpl_chk_code: Reply check code.
+ */
+struct ethtool_cmis_cdb_rpl_hdr {
+ u8 rpl_len;
+ u8 rpl_chk_code;
+};
+
+/**
+ * struct ethtool_cmis_cdb_rpl - CDB commands reply arguments
+ * @hdr: CDB commands reply header arguments.
+ * @payload: Payload for the CDB commands reply.
+ */
+struct ethtool_cmis_cdb_rpl {
+ struct ethtool_cmis_cdb_rpl_hdr hdr;
+ u8 payload[ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH];
+};
+
+u32 ethtool_cmis_get_max_payload_size(u8 num_of_byte_octs);
+
+void ethtool_cmis_cdb_compose_args(struct ethtool_cmis_cdb_cmd_args *args,
+ enum ethtool_cmis_cdb_cmd_id cmd, u8 *pl,
+ u8 lpl_len, u16 max_duration,
+ u8 read_write_len_ext, u16 msleep_pre_rpl,
+ u8 rpl_exp_len, u8 flags);
+
+void ethtool_cmis_cdb_check_completion_flag(u8 cmis_rev, u8 *flags);
+
+void ethtool_cmis_page_init(struct ethtool_module_eeprom *page_data,
+ u8 page, u32 offset, u32 length);
+void ethtool_cmis_page_fini(struct ethtool_module_eeprom *page_data);
+
+struct ethtool_cmis_cdb *
+ethtool_cmis_cdb_init(struct net_device *dev,
+ const struct ethtool_module_fw_flash_params *params);
+void ethtool_cmis_cdb_fini(struct ethtool_cmis_cdb *cdb);
+
+int ethtool_cmis_wait_for_cond(struct net_device *dev, u8 flags, u8 flag,
+ u16 max_duration, u32 offset,
+ bool (*cond_success)(u8), bool (*cond_fail)(u8));
+
+int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
+ struct ethtool_cmis_cdb_cmd_args *args);
diff --git a/net/ethtool/cmis_cdb.c b/net/ethtool/cmis_cdb.c
new file mode 100644
index 000000000000..992d59c51299
--- /dev/null
+++ b/net/ethtool/cmis_cdb.c
@@ -0,0 +1,549 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/ethtool.h>
+#include <linux/jiffies.h>
+
+#include "common.h"
+#include "module_fw.h"
+#include "cmis.h"
+
+/* For accessing the LPL field on page 9Fh, the allowable length extension is
+ * min(i, 15) byte octets where i specifies the allowable additional number of
+ * byte octets in a READ or a WRITE.
+ */
+u32 ethtool_cmis_get_max_payload_size(u8 num_of_byte_octs)
+{
+ return 8 * (1 + min_t(u8, num_of_byte_octs, 15));
+}
+
+void ethtool_cmis_cdb_compose_args(struct ethtool_cmis_cdb_cmd_args *args,
+ enum ethtool_cmis_cdb_cmd_id cmd, u8 *pl,
+ u8 lpl_len, u16 max_duration,
+ u8 read_write_len_ext, u16 msleep_pre_rpl,
+ u8 rpl_exp_len, u8 flags)
+{
+ args->req.id = cpu_to_be16(cmd);
+ args->req.lpl_len = lpl_len;
+ if (pl)
+ memcpy(args->req.payload, pl, args->req.lpl_len);
+
+ args->max_duration = max_duration;
+ args->read_write_len_ext =
+ ethtool_cmis_get_max_payload_size(read_write_len_ext);
+ args->msleep_pre_rpl = msleep_pre_rpl;
+ args->rpl_exp_len = rpl_exp_len;
+ args->flags = flags;
+ args->err_msg = NULL;
+}
+
+void ethtool_cmis_page_init(struct ethtool_module_eeprom *page_data,
+ u8 page, u32 offset, u32 length)
+{
+ page_data->page = page;
+ page_data->offset = offset;
+ page_data->length = length;
+ page_data->i2c_address = ETHTOOL_CMIS_CDB_PAGE_I2C_ADDR;
+}
+
+#define CMIS_REVISION_PAGE 0x00
+#define CMIS_REVISION_OFFSET 0x01
+
+struct cmis_rev_rpl {
+ u8 rev;
+};
+
+static inline u8
+cmis_rev_rpl_major(struct cmis_rev_rpl *rpl)
+{
+ return rpl->rev >> 4;
+}
+
+static int cmis_rev_major_get(struct net_device *dev, u8 *rev_major)
+{
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct ethtool_module_eeprom page_data = {0};
+ struct netlink_ext_ack extack = {};
+ struct cmis_rev_rpl rpl = {};
+ int err;
+
+ ethtool_cmis_page_init(&page_data, CMIS_REVISION_PAGE,
+ CMIS_REVISION_OFFSET, sizeof(rpl));
+ page_data.data = (u8 *)&rpl;
+
+ err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ return err;
+ }
+
+ *rev_major = cmis_rev_rpl_major(&rpl);
+
+ return 0;
+}
+
+#define CMIS_CDB_ADVERTISEMENT_PAGE 0x01
+#define CMIS_CDB_ADVERTISEMENT_OFFSET 0xA3
+
+/* Based on section 8.4.11 "CDB Messaging Support Advertisement" in CMIS
+ * standard revision 5.2.
+ */
+struct cmis_cdb_advert_rpl {
+ u8 inst_supported;
+ u8 read_write_len_ext;
+ u8 resv1;
+ u8 resv2;
+};
+
+static inline u8
+cmis_cdb_advert_rpl_inst_supported(struct cmis_cdb_advert_rpl *rpl)
+{
+ return rpl->inst_supported >> 6;
+}
+
+static int cmis_cdb_advertisement_get(struct ethtool_cmis_cdb *cdb,
+ struct net_device *dev)
+{
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct ethtool_module_eeprom page_data = {};
+ struct cmis_cdb_advert_rpl rpl = {};
+ struct netlink_ext_ack extack = {};
+ int err;
+
+ ethtool_cmis_page_init(&page_data, CMIS_CDB_ADVERTISEMENT_PAGE,
+ CMIS_CDB_ADVERTISEMENT_OFFSET, sizeof(rpl));
+ page_data.data = (u8 *)&rpl;
+
+ err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ return err;
+ }
+
+ if (!cmis_cdb_advert_rpl_inst_supported(&rpl))
+ return -EOPNOTSUPP;
+
+ cdb->read_write_len_ext = rpl.read_write_len_ext;
+
+ return 0;
+}
+
+#define CMIS_PASSWORD_ENTRY_PAGE 0x00
+#define CMIS_PASSWORD_ENTRY_OFFSET 0x7A
+
+struct cmis_password_entry_pl {
+ __be32 password;
+};
+
+/* See section 9.3.1 "CMD 0000h: Query Status" in CMIS standard revision 5.2.
+ * struct cmis_cdb_query_status_pl and struct cmis_cdb_query_status_rpl are
+ * structured layouts of the flat arrays,
+ * struct ethtool_cmis_cdb_request::payload and
+ * struct ethtool_cmis_cdb_rpl::payload respectively.
+ */
+struct cmis_cdb_query_status_pl {
+ u16 response_delay;
+};
+
+struct cmis_cdb_query_status_rpl {
+ u8 length;
+ u8 status;
+};
+
+static int
+cmis_cdb_validate_password(struct ethtool_cmis_cdb *cdb,
+ struct net_device *dev,
+ const struct ethtool_module_fw_flash_params *params)
+{
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct cmis_cdb_query_status_pl qs_pl = {0};
+ struct ethtool_module_eeprom page_data = {};
+ struct ethtool_cmis_cdb_cmd_args args = {};
+ struct cmis_password_entry_pl pe_pl = {};
+ struct cmis_cdb_query_status_rpl *rpl;
+ struct netlink_ext_ack extack = {};
+ int err;
+
+ ethtool_cmis_page_init(&page_data, CMIS_PASSWORD_ENTRY_PAGE,
+ CMIS_PASSWORD_ENTRY_OFFSET, sizeof(pe_pl));
+ page_data.data = (u8 *)&pe_pl;
+
+ pe_pl = *((struct cmis_password_entry_pl *)page_data.data);
+ pe_pl.password = params->password;
+ err = ops->set_module_eeprom_by_page(dev, &page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ return err;
+ }
+
+ ethtool_cmis_cdb_compose_args(&args, ETHTOOL_CMIS_CDB_CMD_QUERY_STATUS,
+ (u8 *)&qs_pl, sizeof(qs_pl), 0,
+ cdb->read_write_len_ext, 1000,
+ sizeof(*rpl),
+ CDB_F_COMPLETION_VALID | CDB_F_STATUS_VALID);
+
+ err = ethtool_cmis_cdb_execute_cmd(dev, &args);
+ if (err < 0) {
+ ethnl_module_fw_flash_ntf_err(dev,
+ "Query Status command failed",
+ args.err_msg);
+ return err;
+ }
+
+ rpl = (struct cmis_cdb_query_status_rpl *)args.req.payload;
+ if (!rpl->length || !rpl->status) {
+ ethnl_module_fw_flash_ntf_err(dev, "Password was not accepted",
+ NULL);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Some CDB commands asserts the CDB completion flag only from CMIS
+ * revision 5. Therefore, check the relevant validity flag only when
+ * the revision supports it.
+ */
+inline void ethtool_cmis_cdb_check_completion_flag(u8 cmis_rev, u8 *flags)
+{
+ *flags |= cmis_rev >= 5 ? CDB_F_COMPLETION_VALID : 0;
+}
+
+#define CMIS_CDB_MODULE_FEATURES_RESV_DATA 34
+
+/* See section 9.4.1 "CMD 0040h: Module Features" in CMIS standard revision 5.2.
+ * struct cmis_cdb_module_features_rpl is structured layout of the flat
+ * array, ethtool_cmis_cdb_rpl::payload.
+ */
+struct cmis_cdb_module_features_rpl {
+ u8 resv1[CMIS_CDB_MODULE_FEATURES_RESV_DATA];
+ __be16 max_completion_time;
+};
+
+static inline u16
+cmis_cdb_module_features_completion_time(struct cmis_cdb_module_features_rpl *rpl)
+{
+ return be16_to_cpu(rpl->max_completion_time);
+}
+
+static int cmis_cdb_module_features_get(struct ethtool_cmis_cdb *cdb,
+ struct net_device *dev)
+{
+ struct ethtool_cmis_cdb_cmd_args args = {};
+ struct cmis_cdb_module_features_rpl *rpl;
+ u8 flags = CDB_F_STATUS_VALID;
+ int err;
+
+ ethtool_cmis_cdb_check_completion_flag(cdb->cmis_rev, &flags);
+ ethtool_cmis_cdb_compose_args(&args,
+ ETHTOOL_CMIS_CDB_CMD_MODULE_FEATURES,
+ NULL, 0, 0, cdb->read_write_len_ext,
+ 1000, sizeof(*rpl), flags);
+
+ err = ethtool_cmis_cdb_execute_cmd(dev, &args);
+ if (err < 0) {
+ ethnl_module_fw_flash_ntf_err(dev,
+ "Module Features command failed",
+ args.err_msg);
+ return err;
+ }
+
+ rpl = (struct cmis_cdb_module_features_rpl *)args.req.payload;
+ cdb->max_completion_time =
+ cmis_cdb_module_features_completion_time(rpl);
+
+ return 0;
+}
+
+struct ethtool_cmis_cdb *
+ethtool_cmis_cdb_init(struct net_device *dev,
+ const struct ethtool_module_fw_flash_params *params)
+{
+ struct ethtool_cmis_cdb *cdb;
+ int err;
+
+ cdb = kzalloc(sizeof(*cdb), GFP_KERNEL);
+ if (!cdb)
+ return ERR_PTR(-ENOMEM);
+
+ err = cmis_rev_major_get(dev, &cdb->cmis_rev);
+ if (err < 0)
+ goto err;
+
+ if (cdb->cmis_rev < 4) {
+ ethnl_module_fw_flash_ntf_err(dev,
+ "CMIS revision doesn't support module firmware flashing",
+ NULL);
+ err = -EOPNOTSUPP;
+ goto err;
+ }
+
+ err = cmis_cdb_advertisement_get(cdb, dev);
+ if (err < 0)
+ goto err;
+
+ if (params->password_valid) {
+ err = cmis_cdb_validate_password(cdb, dev, params);
+ if (err < 0)
+ goto err;
+ }
+
+ err = cmis_cdb_module_features_get(cdb, dev);
+ if (err < 0)
+ goto err;
+
+ return cdb;
+
+err:
+ ethtool_cmis_cdb_fini(cdb);
+ return ERR_PTR(err);
+}
+
+void ethtool_cmis_cdb_fini(struct ethtool_cmis_cdb *cdb)
+{
+ kfree(cdb);
+}
+
+static bool is_completed(u8 data)
+{
+ return !!(data & 0x40);
+}
+
+#define CMIS_CDB_STATUS_SUCCESS 0x01
+
+static bool status_success(u8 data)
+{
+ return data == CMIS_CDB_STATUS_SUCCESS;
+}
+
+#define CMIS_CDB_STATUS_FAIL 0x40
+
+static bool status_fail(u8 data)
+{
+ return data & CMIS_CDB_STATUS_FAIL;
+}
+
+struct cmis_wait_for_cond_rpl {
+ u8 state;
+};
+
+int ethtool_cmis_wait_for_cond(struct net_device *dev, u8 flags, u8 flag,
+ u16 max_duration, u32 offset,
+ bool (*cond_success)(u8), bool (*cond_fail)(u8))
+{
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct ethtool_module_eeprom page_data = {0};
+ struct cmis_wait_for_cond_rpl rpl = {};
+ struct netlink_ext_ack extack = {};
+ unsigned long end;
+ int err;
+
+ if (!(flags & flag))
+ return 0;
+
+ if (max_duration == 0)
+ max_duration = U16_MAX;
+
+ end = jiffies + msecs_to_jiffies(max_duration);
+ do {
+ ethtool_cmis_page_init(&page_data, 0, offset, sizeof(rpl));
+ page_data.data = (u8 *)&rpl;
+
+ err = ops->get_module_eeprom_by_page(dev, &page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ continue;
+ }
+
+ if ((*cond_success)(rpl.state))
+ return 0;
+
+ if (*cond_fail && (*cond_fail)(rpl.state))
+ break;
+
+ msleep(20);
+ } while (time_before(jiffies, end));
+
+ return -EBUSY;
+}
+
+#define CMIS_CDB_COMPLETION_FLAG_OFFSET 0x08
+
+static int cmis_cdb_wait_for_completion(struct net_device *dev,
+ struct ethtool_cmis_cdb_cmd_args *args)
+{
+ int err;
+
+ /* Some vendors demand waiting time before checking completion flag
+ * in some CDB commands.
+ */
+ msleep(args->msleep_pre_rpl);
+
+ err = ethtool_cmis_wait_for_cond(dev, args->flags,
+ CDB_F_COMPLETION_VALID,
+ args->max_duration,
+ CMIS_CDB_COMPLETION_FLAG_OFFSET,
+ is_completed, NULL);
+ if (err < 0)
+ args->err_msg = "Completion Flag did not set on time";
+
+ return err;
+}
+
+#define CMIS_CDB_STATUS_OFFSET 0x25
+
+static int cmis_cdb_wait_for_status(struct net_device *dev,
+ struct ethtool_cmis_cdb_cmd_args *args)
+{
+ int err;
+
+ /* Some vendors demand waiting time before checking status in some
+ * CDB commands.
+ */
+ msleep(args->msleep_pre_rpl);
+
+ err = ethtool_cmis_wait_for_cond(dev, args->flags, CDB_F_STATUS_VALID,
+ args->max_duration,
+ CMIS_CDB_STATUS_OFFSET,
+ status_success, status_fail);
+ if (err < 0)
+ args->err_msg = "CDB Status did not succeed on time";
+
+ return err;
+}
+
+#define CMIS_CDB_REPLY_OFFSET 0x86
+
+static int cmis_cdb_process_reply(struct net_device *dev,
+ struct ethtool_module_eeprom *page_data,
+ struct ethtool_cmis_cdb_cmd_args *args)
+{
+ u8 rpl_hdr_len = sizeof(struct ethtool_cmis_cdb_rpl_hdr);
+ u8 rpl_exp_len = args->rpl_exp_len + rpl_hdr_len;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct netlink_ext_ack extack = {};
+ struct ethtool_cmis_cdb_rpl *rpl;
+ int err;
+
+ if (!args->rpl_exp_len)
+ return 0;
+
+ ethtool_cmis_page_init(page_data, ETHTOOL_CMIS_CDB_CMD_PAGE,
+ CMIS_CDB_REPLY_OFFSET, rpl_exp_len);
+ page_data->data = kmalloc(page_data->length, GFP_KERNEL);
+ if (!page_data->data)
+ return -ENOMEM;
+
+ err = ops->get_module_eeprom_by_page(dev, page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ goto out;
+ }
+
+ rpl = (struct ethtool_cmis_cdb_rpl *)page_data->data;
+ if ((args->rpl_exp_len > rpl->hdr.rpl_len + rpl_hdr_len) ||
+ !rpl->hdr.rpl_chk_code) {
+ err = -EIO;
+ goto out;
+ }
+
+ args->req.lpl_len = rpl->hdr.rpl_len;
+ memcpy(args->req.payload, rpl->payload, args->req.lpl_len);
+
+out:
+ kfree(page_data->data);
+ return err;
+}
+
+static int
+__ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
+ struct ethtool_module_eeprom *page_data,
+ u8 page, u32 offset, u32 length, void *data)
+{
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct netlink_ext_ack extack = {};
+ int err;
+
+ ethtool_cmis_page_init(page_data, page, offset, length);
+ page_data->data = kmalloc(page_data->length, GFP_KERNEL);
+ if (!page_data->data)
+ return -ENOMEM;
+
+ memcpy(page_data->data, data, page_data->length);
+
+ err = ops->set_module_eeprom_by_page(dev, page_data, &extack);
+ if (err < 0) {
+ if (extack._msg)
+ netdev_err(dev, "%s\n", extack._msg);
+ }
+
+ kfree(page_data->data);
+ return err;
+}
+
+static u8 cmis_cdb_calc_checksum(const void *data, size_t size)
+{
+ const u8 *bytes = (const u8 *)data;
+ u8 checksum = 0;
+
+ for (size_t i = 0; i < size; i++)
+ checksum += bytes[i];
+
+ return ~checksum;
+}
+
+#define CMIS_CDB_CMD_ID_OFFSET 0x80
+
+int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
+ struct ethtool_cmis_cdb_cmd_args *args)
+{
+ struct ethtool_module_eeprom page_data = {};
+ u32 offset;
+ int err;
+
+ args->req.chk_code =
+ cmis_cdb_calc_checksum(&args->req, sizeof(args->req));
+
+ if (args->req.lpl_len > args->read_write_len_ext) {
+ args->err_msg = "LPL length is longer than CDB read write length extension allows";
+ return -EINVAL;
+ }
+
+ /* According to the CMIS standard, there are two options to trigger the
+ * CDB commands. The default option is triggering the command by writing
+ * the CMDID bytes. Therefore, the command will be split to 2 calls:
+ * First, with everything except the CMDID field and then the CMDID
+ * field.
+ */
+ offset = CMIS_CDB_CMD_ID_OFFSET +
+ offsetof(struct ethtool_cmis_cdb_request, body);
+ err = __ethtool_cmis_cdb_execute_cmd(dev, &page_data,
+ ETHTOOL_CMIS_CDB_CMD_PAGE, offset,
+ sizeof(args->req.body),
+ &args->req.body);
+ if (err < 0)
+ return err;
+
+ offset = CMIS_CDB_CMD_ID_OFFSET +
+ offsetof(struct ethtool_cmis_cdb_request, id);
+ err = __ethtool_cmis_cdb_execute_cmd(dev, &page_data,
+ ETHTOOL_CMIS_CDB_CMD_PAGE, offset,
+ sizeof(args->req.id),
+ &args->req.id);
+ if (err < 0)
+ return err;
+
+ err = cmis_cdb_wait_for_completion(dev, args);
+ if (err < 0)
+ return err;
+
+ err = cmis_cdb_wait_for_status(dev, args);
+ if (err < 0)
+ return err;
+
+ return cmis_cdb_process_reply(dev, &page_data, args);
+}
diff --git a/net/ethtool/module_fw.h b/net/ethtool/module_fw.h
index e40eae442741..96da7a8175f2 100644
--- a/net/ethtool/module_fw.h
+++ b/net/ethtool/module_fw.h
@@ -8,3 +8,13 @@ void ethnl_module_fw_flash_ntf_start(struct net_device *dev);
void ethnl_module_fw_flash_ntf_complete(struct net_device *dev);
void ethnl_module_fw_flash_ntf_in_progress(struct net_device *dev, u64 done,
u64 total);
+
+/**
+ * struct ethtool_module_fw_flash_params - module firmware flashing parameters
+ * @password: Module password. Only valid when @pass_valid is set.
+ * @password_valid: Whether the module password is valid or not.
+ */
+struct ethtool_module_fw_flash_params {
+ __be32 password;
+ u8 password_valid:1;
+};
--
2.43.0
