ice: add ethtool -m support for reading i2c eeprom modules

Implement ethtool -m support to read eeprom data from SFP/QSFP modules.

Signed-off-by: Scott W Taylor <scott.w.taylor@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 147 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 7e779060069c..a8e51bc95198 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -3455,6 +3455,151 @@ ice_set_per_q_coalesce(struct net_device *netdev, u32 q_num,
 	return __ice_set_coalesce(netdev, ec, q_num);
 }
 
+#define ICE_I2C_EEPROM_DEV_ADDR		0xA0
+#define ICE_I2C_EEPROM_DEV_ADDR2	0xA2
+#define ICE_MODULE_TYPE_SFP		0x03
+#define ICE_MODULE_TYPE_QSFP_PLUS	0x0D
+#define ICE_MODULE_TYPE_QSFP28		0x11
+#define ICE_MODULE_SFF_ADDR_MODE	0x04
+#define ICE_MODULE_SFF_DIAG_CAPAB	0x40
+#define ICE_MODULE_REVISION_ADDR	0x01
+#define ICE_MODULE_SFF_8472_COMP	0x5E
+#define ICE_MODULE_SFF_8472_SWAP	0x5C
+#define ICE_MODULE_QSFP_MAX_LEN		640
+
+/**
+ * ice_get_module_info - get SFF module type and revision information
+ * @netdev: network interface device structure
+ * @modinfo: module EEPROM size and layout information structure
+ */
+static int
+ice_get_module_info(struct net_device *netdev,
+		    struct ethtool_modinfo *modinfo)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	struct ice_hw *hw = &pf->hw;
+	enum ice_status status;
+	u8 sff8472_comp = 0;
+	u8 sff8472_swap = 0;
+	u8 sff8636_rev = 0;
+	u8 value = 0;
+
+	status = ice_aq_sff_eeprom(hw, 0, ICE_I2C_EEPROM_DEV_ADDR, 0x00, 0x00,
+				   0, &value, 1, 0, NULL);
+	if (status)
+		return -EIO;
+
+	switch (value) {
+	case ICE_MODULE_TYPE_SFP:
+		status = ice_aq_sff_eeprom(hw, 0, ICE_I2C_EEPROM_DEV_ADDR,
+					   ICE_MODULE_SFF_8472_COMP, 0x00, 0,
+					   &sff8472_comp, 1, 0, NULL);
+		if (status)
+			return -EIO;
+		status = ice_aq_sff_eeprom(hw, 0, ICE_I2C_EEPROM_DEV_ADDR,
+					   ICE_MODULE_SFF_8472_SWAP, 0x00, 0,
+					   &sff8472_swap, 1, 0, NULL);
+		if (status)
+			return -EIO;
+
+		if (sff8472_swap & ICE_MODULE_SFF_ADDR_MODE) {
+			modinfo->type = ETH_MODULE_SFF_8079;
+			modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
+		} else if (sff8472_comp &&
+			   (sff8472_swap & ICE_MODULE_SFF_DIAG_CAPAB)) {
+			modinfo->type = ETH_MODULE_SFF_8472;
+			modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
+		} else {
+			modinfo->type = ETH_MODULE_SFF_8079;
+			modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
+		}
+		break;
+	case ICE_MODULE_TYPE_QSFP_PLUS:
+	case ICE_MODULE_TYPE_QSFP28:
+		status = ice_aq_sff_eeprom(hw, 0, ICE_I2C_EEPROM_DEV_ADDR,
+					   ICE_MODULE_REVISION_ADDR, 0x00, 0,
+					   &sff8636_rev, 1, 0, NULL);
+		if (status)
+			return -EIO;
+		/* Check revision compliance */
+		if (sff8636_rev > 0x02) {
+			/* Module is SFF-8636 compliant */
+			modinfo->type = ETH_MODULE_SFF_8636;
+			modinfo->eeprom_len = ICE_MODULE_QSFP_MAX_LEN;
+		} else {
+			modinfo->type = ETH_MODULE_SFF_8436;
+			modinfo->eeprom_len = ICE_MODULE_QSFP_MAX_LEN;
+		}
+		break;
+	default:
+		netdev_warn(netdev,
+			    "SFF Module Type not recognized.\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/**
+ * ice_get_module_eeprom - fill buffer with SFF EEPROM contents
+ * @netdev: network interface device structure
+ * @ee: EEPROM dump request structure
+ * @data: buffer to be filled with EEPROM contents
+ */
+static int
+ice_get_module_eeprom(struct net_device *netdev,
+		      struct ethtool_eeprom *ee, u8 *data)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+	u8 addr = ICE_I2C_EEPROM_DEV_ADDR;
+	struct ice_vsi *vsi = np->vsi;
+	struct ice_pf *pf = vsi->back;
+	struct ice_hw *hw = &pf->hw;
+	enum ice_status status;
+	bool is_sfp = false;
+	u16 offset = 0;
+	u8 value = 0;
+	u8 page = 0;
+	int i;
+
+	status = ice_aq_sff_eeprom(hw, 0, addr, offset, page, 0,
+				   &value, 1, 0, NULL);
+	if (status)
+		return -EIO;
+
+	if (!ee || !ee->len || !data)
+		return -EINVAL;
+
+	if (value == ICE_MODULE_TYPE_SFP)
+		is_sfp = true;
+
+	for (i = 0; i < ee->len; i++) {
+		offset = i + ee->offset;
+
+		/* Check if we need to access the other memory page */
+		if (is_sfp) {
+			if (offset >= ETH_MODULE_SFF_8079_LEN) {
+				offset -= ETH_MODULE_SFF_8079_LEN;
+				addr = ICE_I2C_EEPROM_DEV_ADDR2;
+			}
+		} else {
+			while (offset >= ETH_MODULE_SFF_8436_LEN) {
+				/* Compute memory page number and offset. */
+				offset -= ETH_MODULE_SFF_8436_LEN / 2;
+				page++;
+			}
+		}
+
+		status = ice_aq_sff_eeprom(hw, 0, addr, offset, page, !is_sfp,
+					   &value, 1, 0, NULL);
+		if (status)
+			value = 0;
+		data[i] = value;
+	}
+	return 0;
+}
+
 static const struct ethtool_ops ice_ethtool_ops = {
 	.get_link_ksettings	= ice_get_link_ksettings,
 	.set_link_ksettings	= ice_set_link_ksettings,
@@ -3490,6 +3635,8 @@ static const struct ethtool_ops ice_ethtool_ops = {
 	.set_per_queue_coalesce = ice_set_per_q_coalesce,
 	.get_fecparam		= ice_get_fecparam,
 	.set_fecparam		= ice_set_fecparam,
+	.get_module_info	= ice_get_module_info,
+	.get_module_eeprom	= ice_get_module_eeprom,
 };
 
 static const struct ethtool_ops ice_ethtool_safe_mode_ops = {