netdev - [RFC PATCH ethtool-next 4/6] ethtool: Print CMIS Module-Level Controls

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Date:   Mon,  9 Aug 2021 13:22:54 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
        mkubecek@...e.cz, pali@...nel.org, vadimp@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [RFC PATCH ethtool-next 4/6] ethtool: Print CMIS Module-Level Controls

From: Ido Schimmel <idosch@...dia.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 low-power on

 # 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 low-power off

 # 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@...dia.com>
---
 cmis.c | 17 +++++++++++++++++
 cmis.h |  5 +++++
 2 files changed, 22 insertions(+)

diff --git a/cmis.c b/cmis.c
index f09219fd889d..f9b4720e6c2c 100644
--- a/cmis.c
+++ b/cmis.c
@@ -75,6 +75,21 @@ static void cmis_show_mod_state(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.
  * Relevant documents:
@@ -370,6 +385,7 @@ void qsfp_dd_show_all(const __u8 *id)
 	cmis_show_vendor_info(id);
 	cmis_show_rev_compliance(id);
 	cmis_show_mod_state(id);
+	cmis_show_mod_lvl_controls(id);
 }
 
 void cmis_show_all(const struct ethtool_module_eeprom *page_zero,
@@ -391,4 +407,5 @@ void cmis_show_all(const struct ethtool_module_eeprom *page_zero,
 	cmis_show_vendor_info(page_zero_data);
 	cmis_show_rev_compliance(page_zero_data);
 	cmis_show_mod_state(page_zero_data);
+	cmis_show_mod_lvl_controls(page_zero_data);
 }
diff --git a/cmis.h b/cmis.h
index 197b70a2034d..5a314340eff0 100644
--- a/cmis.h
+++ b/cmis.h
@@ -21,6 +21,11 @@
 #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