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ethtool: cmis_cdb: Add a layer for supporting CDB commands

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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@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Danielle Ratson
2024-06-27 17:08:54 +03:00
committed by David S. Miller
parent e4f9193699
commit a39c84d796
4 changed files with 730 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
net/ethtool/module_fw.h
View File

@@ -15,6 +15,16 @@ struct ethnl_module_fw_flash_ntf_params {
bool closed_sock;
};
/**
* 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;
};
void
ethnl_module_fw_flash_ntf_err(struct net_device *dev,
struct ethnl_module_fw_flash_ntf_params *params,