bnxt_en: add .get_module_eeprom_by_page() support

Add support for .get_module_eeprom_by_page() callback which
implements generic solution for module`s eeprom access.

v3: Add bnxt_get_module_status() to get a more specific extack error
    string.
    Return -EINVAL from bnxt_get_module_eeprom_by_page() when we
    don't want to fallback to old method.
v2: Simplification suggested by Ido Schimmel

Link: https://lore.kernel.org/netdev/YzVJ%2FvKJugoz15yV@shredder/Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2116,6 +2116,7 @@ struct bnxt {
 #define BNXT_PHY_FL_NO_FCS		PORT_PHY_QCAPS_RESP_FLAGS_NO_FCS
 #define BNXT_PHY_FL_NO_PAUSE		(PORT_PHY_QCAPS_RESP_FLAGS2_PAUSE_UNSUPPORTED << 8)
 #define BNXT_PHY_FL_NO_PFC		(PORT_PHY_QCAPS_RESP_FLAGS2_PFC_UNSUPPORTED << 8)
+#define BNXT_PHY_FL_BANK_SEL		(PORT_PHY_QCAPS_RESP_FLAGS2_BANK_ADDR_SUPPORTED << 8)
 
 	u8			num_tests;
 	struct bnxt_test_info	*test_info;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -3146,8 +3146,9 @@ static int bnxt_get_eee(struct net_device *dev, struct ethtool_eee *edata)
 }
 
 static int bnxt_read_sfp_module_eeprom_info(struct bnxt *bp, u16 i2c_addr,
-					    u16 page_number, u16 start_addr,
-					    u16 data_length, u8 *buf)
+					    u16 page_number, u8 bank,
+					    u16 start_addr, u16 data_length,
+					    u8 *buf)
 {
 	struct hwrm_port_phy_i2c_read_output *output;
 	struct hwrm_port_phy_i2c_read_input *req;
@@ -3168,8 +3169,13 @@ static int bnxt_read_sfp_module_eeprom_info(struct bnxt *bp, u16 i2c_addr,
 		data_length -= xfer_size;
 		req->page_offset = cpu_to_le16(start_addr + byte_offset);
 		req->data_length = xfer_size;
-		req->enables = cpu_to_le32(start_addr + byte_offset ?
-				 PORT_PHY_I2C_READ_REQ_ENABLES_PAGE_OFFSET : 0);
+		req->enables =
+			cpu_to_le32((start_addr + byte_offset ?
+				     PORT_PHY_I2C_READ_REQ_ENABLES_PAGE_OFFSET :
+				     0) |
+				    (bank ?
+				     PORT_PHY_I2C_READ_REQ_ENABLES_BANK_NUMBER :
+				     0));
 		rc = hwrm_req_send(bp, req);
 		if (!rc)
 			memcpy(buf + byte_offset, output->data, xfer_size);
@@ -3199,7 +3205,7 @@ static int bnxt_get_module_info(struct net_device *dev,
 	if (bp->hwrm_spec_code < 0x10202)
 		return -EOPNOTSUPP;
 
-	rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A0, 0, 0,
+	rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A0, 0, 0, 0,
 					      SFF_DIAG_SUPPORT_OFFSET + 1,
 					      data);
 	if (!rc) {
@@ -3244,7 +3250,7 @@ static int bnxt_get_module_eeprom(struct net_device *dev,
 	if (start < ETH_MODULE_SFF_8436_LEN) {
 		if (start + eeprom->len > ETH_MODULE_SFF_8436_LEN)
 			length = ETH_MODULE_SFF_8436_LEN - start;
-		rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A0, 0,
+		rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A0, 0, 0,
 						      start, length, data);
 		if (rc)
 			return rc;
@@ -3256,12 +3262,68 @@ static int bnxt_get_module_eeprom(struct net_device *dev,
 	/* Read A2 portion of the EEPROM */
 	if (length) {
 		start -= ETH_MODULE_SFF_8436_LEN;
-		rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A2, 0,
+		rc = bnxt_read_sfp_module_eeprom_info(bp, I2C_DEV_ADDR_A2, 0, 0,
 						      start, length, data);
 	}
 	return rc;
 }
 
+static int bnxt_get_module_status(struct bnxt *bp, struct netlink_ext_ack *extack)
+{
+	if (bp->link_info.module_status <=
+	    PORT_PHY_QCFG_RESP_MODULE_STATUS_WARNINGMSG)
+		return 0;
+
+	switch (bp->link_info.module_status) {
+	case PORT_PHY_QCFG_RESP_MODULE_STATUS_PWRDOWN:
+		NL_SET_ERR_MSG_MOD(extack, "Transceiver module is powering down");
+		break;
+	case PORT_PHY_QCFG_RESP_MODULE_STATUS_NOTINSERTED:
+		NL_SET_ERR_MSG_MOD(extack, "Transceiver module not inserted");
+		break;
+	case PORT_PHY_QCFG_RESP_MODULE_STATUS_CURRENTFAULT:
+		NL_SET_ERR_MSG_MOD(extack, "Transceiver module disabled due to current fault");
+		break;
+	default:
+		NL_SET_ERR_MSG_MOD(extack, "Unknown error");
+		break;
+	}
+	return -EINVAL;
+}
+
+static int bnxt_get_module_eeprom_by_page(struct net_device *dev,
+					  const struct ethtool_module_eeprom *page_data,
+					  struct netlink_ext_ack *extack)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	int rc;
+
+	rc = bnxt_get_module_status(bp, extack);
+	if (rc)
+		return rc;
+
+	if (bp->hwrm_spec_code < 0x10202) {
+		NL_SET_ERR_MSG_MOD(extack, "Firmware version too old");
+		return -EINVAL;
+	}
+
+	if (page_data->bank && !(bp->phy_flags & BNXT_PHY_FL_BANK_SEL)) {
+		NL_SET_ERR_MSG_MOD(extack, "Firmware not capable for bank selection");
+		return -EINVAL;
+	}
+
+	rc = bnxt_read_sfp_module_eeprom_info(bp, page_data->i2c_address << 1,
+					      page_data->page, page_data->bank,
+					      page_data->offset,
+					      page_data->length,
+					      page_data->data);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Module`s eeprom read failed");
+		return rc;
+	}
+	return page_data->length;
+}
+
 static int bnxt_nway_reset(struct net_device *dev)
 {
 	int rc = 0;
@@ -4071,6 +4133,7 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 	.set_eee		= bnxt_set_eee,
 	.get_module_info	= bnxt_get_module_info,
 	.get_module_eeprom	= bnxt_get_module_eeprom,
+	.get_module_eeprom_by_page = bnxt_get_module_eeprom_by_page,
 	.nway_reset		= bnxt_nway_reset,
 	.set_phys_id		= bnxt_set_phys_id,
 	.self_test		= bnxt_self_test,