Re: [RFC PATCH net-next v2 06/10] net: ethtool: Introduce a command to list PHYs on an interface

From: Andrew Lunn
Date: Mon Nov 20 2023 - 20:40:35 EST


> +ethnl_phy_reply_size(const struct ethnl_req_info *req_base,
> + struct netlink_ext_ack *extack)
> +{
> + struct phy_device_node *pdn;
> + struct phy_device *phydev;
> + struct link_topology *lt;
> + unsigned long index;
> + size_t size;
> +
> + lt = &req_base->dev->link_topo;
> +
> + size = nla_total_size(0);
> +
> + xa_for_each(&lt->phys, index, pdn) {
> + phydev = pdn->phy;
> +
> + /* ETHTOOL_A_PHY_INDEX */
> + size += nla_total_size(sizeof(u32));
> +
> + /* ETHTOOL_A_DRVNAME */
> + size += nla_total_size(strlen(phydev->drv->name));
> +
> + /* ETHTOOL_A_NAME */
> + size += nla_total_size(strlen(dev_name(&phydev->mdio.dev)));
> +
> + /* ETHTOOL_A_PHY_UPSTREAM_TYPE */
> + size += nla_total_size(sizeof(u8));
> +
> + /* ETHTOOL_A_PHY_ID */
> + size += nla_total_size(sizeof(u32));
> +
> + if (phy_on_sfp(phydev)) {
> + /* ETHTOOL_A_PHY_UPSTREAM_SFP_NAME */
> + if (sfp_get_name(pdn->parent_sfp_bus))
> + size += nla_total_size(strlen(sfp_get_name(pdn->parent_sfp_bus)));

Have you tried a modular build?

sfp_get_name() could be in a module, and then you will get linker
errors. It is all a bit messy calling into phylib from ethtool :-(

This might actually be the only function you need? If so, its small
enough you can move it into a header as a static inline function.

Andrew