[RFC PATCH ethtool-next v2 4/6] ethtool: Print CMIS Module-Level Controls
From: Ido Schimmel <hidden>
Date: 2021-08-18 15:55:42
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Ido Schimmel <idosch@nvidia.com> Print the CMIS Module-Level Controls when dumping EEPROM contents via the '-m' option. It can be used to understand low power mode enforcement by the host. Example output: # ethtool -m swp11 Identifier : 0x18 (QSFP-DD Double Density 8X Pluggable Transceiver (INF-8628)) ... Module State : 0x03 (ModuleReady) LowPwrAllowRequestHW : Off LowPwrRequestSW : Off # ethtool --set-module swp11 power-mode-policy low # ethtool -m swp11 Identifier : 0x18 (QSFP-DD Double Density 8X Pluggable Transceiver (INF-8628)) ... Module State : 0x01 (ModuleLowPwr) LowPwrAllowRequestHW : Off LowPwrRequestSW : On # ethtool --set-module swp11 power-mode-policy high # ethtool -m swp11 Identifier : 0x18 (QSFP-DD Double Density 8X Pluggable Transceiver (INF-8628)) ... Module State : 0x03 (ModuleReady) LowPwrAllowRequestHW : Off LowPwrRequestSW : Off In the above example, the LowPwrRequestHW signal is ignored and low power mode is controlled via software only. Signed-off-by: Ido Schimmel <idosch@nvidia.com> --- cmis.c | 16 ++++++++++++++++ cmis.h | 5 +++++ 2 files changed, 21 insertions(+)
diff --git a/cmis.c b/cmis.c
index c5c1f02398f6..cd1c7d6e83c9 100644
--- a/cmis.c
+++ b/cmis.c@@ -108,6 +108,20 @@ static void cmis_show_mod_fault_cause(const __u8 *id) } } +/* + * Print the current Module-Level Controls. Relevant documents: + * [1] CMIS Rev. 5, pag. 58, section 6.3.2.2, Table 6-12 + * [2] CMIS Rev. 5, pag. 111, section 8.2.6, Table 8-10 + */ +static void cmis_show_mod_lvl_controls(const __u8 *id) +{ + printf("\t%-41s : ", "LowPwrAllowRequestHW"); + printf("%s\n", ONOFF(id[CMIS_MODULE_CONTROL_OFFSET] & + CMIS_LOW_PWR_ALLOW_REQUEST_HW)); + printf("\t%-41s : ", "LowPwrRequestSW"); + printf("%s\n", ONOFF(id[CMIS_MODULE_CONTROL_OFFSET] & + CMIS_LOW_PWR_REQUEST_SW)); +} /** * Print information about the device's power consumption.
@@ -405,6 +419,7 @@ void qsfp_dd_show_all(const __u8 *id) cmis_show_rev_compliance(id); cmis_show_mod_state(id); cmis_show_mod_fault_cause(id); + cmis_show_mod_lvl_controls(id); } void cmis_show_all(const struct ethtool_module_eeprom *page_zero,
@@ -427,4 +442,5 @@ void cmis_show_all(const struct ethtool_module_eeprom *page_zero, cmis_show_rev_compliance(page_zero_data); cmis_show_mod_state(page_zero_data); cmis_show_mod_fault_cause(page_zero_data); + cmis_show_mod_lvl_controls(page_zero_data); }
diff --git a/cmis.h b/cmis.h
index 41383132cf8e..41288d4e88bc 100644
--- a/cmis.h
+++ b/cmis.h@@ -28,6 +28,11 @@ #define CMIS_CURR_TEMP_OFFSET 0x0E #define CMIS_CURR_CURR_OFFSET 0x10 +/* Module-Level Controls (Page 0) */ +#define CMIS_MODULE_CONTROL_OFFSET 0x1A +#define CMIS_LOW_PWR_ALLOW_REQUEST_HW (1 << 6) +#define CMIS_LOW_PWR_REQUEST_SW (1 << 4) + #define CMIS_CTOR_OFFSET 0xCB /* Vendor related information (Page 0) */
--
2.31.1