bnxt_en: add .set_module_eeprom_by_page() support

JIRA: https://issues.redhat.com/browse/RHEL-76565

commit c3be245
Author: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Date:   Mon Mar 10 11:31:29 2025 -0700

    bnxt_en: add .set_module_eeprom_by_page() support

    Add support for .set_module_eeprom_by_page() callback
    which implements generic solution for modules eeprom access.
    This implementation also supports CMIS 5.0.3 compliant
    eeprom FW download.

    Sample Usage:
    ethtool --flash-module-firmware enp177s0np0 file dummy.bin

    Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
    Signed-off-by: Michael Chan <michael.chan@broadcom.com>
    Link: https://patch.msgid.link/20250310183129.3154117-8-michael.chan@broadcom.com
    Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Shruti Parab <shruti.parab@broadcom.com>

Author: Shruti Parab

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

@@ -4559,7 +4559,7 @@ bnxt_mod_eeprom_by_page_precheck(struct bnxt *bp,
 
 	if (BNXT_VF(bp) && !BNXT_VF_IS_TRUSTED(bp)) {
 		NL_SET_ERR_MSG_MOD(extack,
-				   "Module read not permitted on untrusted VF");
+				   "Module read/write not permitted on untrusted VF");
 		return -EPERM;
 	}
 
@@ -4602,6 +4602,62 @@ static int bnxt_get_module_eeprom_by_page(struct net_device *dev,
 	return page_data->length;
 }
 
+static int bnxt_write_sfp_module_eeprom_info(struct bnxt *bp,
+					     const struct ethtool_module_eeprom *page)
+{
+	struct hwrm_port_phy_i2c_write_input *req;
+	int bytes_written = 0;
+	int rc;
+
+	rc = hwrm_req_init(bp, req, HWRM_PORT_PHY_I2C_WRITE);
+	if (rc)
+		return rc;
+
+	hwrm_req_hold(bp, req);
+	req->i2c_slave_addr = page->i2c_address << 1;
+	req->page_number = cpu_to_le16(page->page);
+	req->bank_number = page->bank;
+	req->port_id = cpu_to_le16(bp->pf.port_id);
+	req->enables = cpu_to_le32(PORT_PHY_I2C_WRITE_REQ_ENABLES_PAGE_OFFSET |
+				   PORT_PHY_I2C_WRITE_REQ_ENABLES_BANK_NUMBER);
+
+	while (bytes_written < page->length) {
+		u16 xfer_size;
+
+		xfer_size = min_t(u16, page->length - bytes_written,
+				  BNXT_MAX_PHY_I2C_RESP_SIZE);
+		req->page_offset = cpu_to_le16(page->offset + bytes_written);
+		req->data_length = xfer_size;
+		memcpy(req->data, page->data + bytes_written, xfer_size);
+		rc = hwrm_req_send(bp, req);
+		if (rc)
+			break;
+		bytes_written += xfer_size;
+	}
+
+	hwrm_req_drop(bp, req);
+	return rc;
+}
+
+static int bnxt_set_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_mod_eeprom_by_page_precheck(bp, page_data, extack);
+	if (rc)
+		return rc;
+
+	rc = bnxt_write_sfp_module_eeprom_info(bp, page_data);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Module`s eeprom write failed");
+		return rc;
+	}
+	return page_data->length;
+}
+
 static int bnxt_nway_reset(struct net_device *dev)
 {
 	int rc = 0;
@@ -5464,6 +5520,7 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 	.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,
+	.set_module_eeprom_by_page = bnxt_set_module_eeprom_by_page,
 	.nway_reset		= bnxt_nway_reset,
 	.set_phys_id		= bnxt_set_phys_id,
 	.self_test		= bnxt_self_test,