netdev - [RFC PATCH ethtool-next 3/6] ethtool: Print CMIS Module State

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Message-Id: <20210809102256.720119-4-idosch@idosch.org>
Date:   Mon,  9 Aug 2021 13:22:53 +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 3/6] ethtool: Print CMIS Module State

From: Ido Schimmel <idosch@...dia.com>

Print the CMIS Module State when dumping EEPROM contents via the '-m'
option. It can be used, for example, to test module low power mode
settings.

Example output:

 # ethtool -m swp11
 Identifier                                : 0x18 (QSFP-DD Double Density 8X Pluggable Transceiver (INF-8628))
 ...
 Module State                              : 0x03 (ModuleReady)

 # 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)

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 cmis.c | 35 +++++++++++++++++++++++++++++++++++
 cmis.h |  8 ++++++++
 2 files changed, 43 insertions(+)

diff --git a/cmis.c b/cmis.c
index 361b721f332f..f09219fd889d 100644
--- a/cmis.c
+++ b/cmis.c
@@ -42,6 +42,39 @@ static void cmis_show_rev_compliance(const __u8 *id)
 	printf("\t%-41s : Rev. %d.%d\n", "Revision compliance", major, minor);
 }
 
+/**
+ * Print the current Module State. Relevant documents:
+ * [1] CMIS Rev. 5, pag. 57, section 6.3.2.2, Figure 6-3
+ * [2] CMIS Rev. 5, pag. 60, section 6.3.2.3, Figure 6-4
+ * [3] CMIS Rev. 5, pag. 107, section 8.2.2, Table 8-6
+ */
+static void cmis_show_mod_state(const __u8 *id)
+{
+	__u8 mod_state = (id[CMIS_MODULE_STATE_OFFSET] >> 1) & 0x07;
+
+	printf("\t%-41s : 0x%02x", "Module State", mod_state);
+	switch (mod_state) {
+	case CMIS_MODULE_STATE_MODULE_LOW_PWR:
+		printf(" (ModuleLowPwr)\n");
+		break;
+	case CMIS_MODULE_STATE_MODULE_PWR_UP:
+		printf(" (ModulePwrUp)\n");
+		break;
+	case CMIS_MODULE_STATE_MODULE_READY:
+		printf(" (ModuleReady)\n");
+		break;
+	case CMIS_MODULE_STATE_MODULE_PWR_DN:
+		printf(" (ModulePwrDn)\n");
+		break;
+	case CMIS_MODULE_STATE_MODULE_FAULT:
+		printf(" (ModuleFault)\n");
+		break;
+	default:
+		printf(" (reserved or unknown)\n");
+		break;
+	}
+}
+
 /**
  * Print information about the device's power consumption.
  * Relevant documents:
@@ -336,6 +369,7 @@ void qsfp_dd_show_all(const __u8 *id)
 	cmis_show_link_len(id);
 	cmis_show_vendor_info(id);
 	cmis_show_rev_compliance(id);
+	cmis_show_mod_state(id);
 }
 
 void cmis_show_all(const struct ethtool_module_eeprom *page_zero,
@@ -356,4 +390,5 @@ 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);
 }
diff --git a/cmis.h b/cmis.h
index 78ee1495bc33..197b70a2034d 100644
--- a/cmis.h
+++ b/cmis.h
@@ -5,6 +5,14 @@
 #define CMIS_ID_OFFSET				0x00
 #define CMIS_REV_COMPLIANCE_OFFSET		0x01
 
+/* Module State (Page 0) */
+#define CMIS_MODULE_STATE_OFFSET		0x03
+#define CMIS_MODULE_STATE_MODULE_LOW_PWR	0x01
+#define CMIS_MODULE_STATE_MODULE_PWR_UP		0x02
+#define CMIS_MODULE_STATE_MODULE_READY		0x03
+#define CMIS_MODULE_STATE_MODULE_PWR_DN		0x04
+#define CMIS_MODULE_STATE_MODULE_FAULT		0x05
+
 #define CMIS_MODULE_TYPE_OFFSET			0x55
 #define CMIS_MT_MMF				0x01
 #define CMIS_MT_SMF				0x02
-- 
2.31.1