// SPDX-License-Identifier: GPL-2.0-only/* * Copyright 2023 Bootlin * */#include "common.h"#include "netlink.h" #include <linux/phy.h>#include <linux/phy_link_topology.h>#include <linux/sfp.h> struct phy_req_info {	struct ethnl_req_info		base;	struct phy_device_node		*pdn;}; #define PHY_REQINFO(__req_base) \	container_of(__req_base, struct phy_req_info, base) const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1] = {	[ETHTOOL_A_PHY_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),}; /* Caller holds rtnl */static ssize_tethnl_phy_reply_size(const struct ethnl_req_info *req_base,		     struct netlink_ext_ack *extack){	struct phy_req_info *req_info = PHY_REQINFO(req_base);	struct phy_device_node *pdn = req_info->pdn;	struct phy_device *phydev = pdn->phy;	size_t size = 0; 	ASSERT_RTNL(); 	/* ETHTOOL_A_PHY_INDEX */	size += nla_total_size(sizeof(u32)); 	/* ETHTOOL_A_DRVNAME */	if (phydev->drv)		size += nla_total_size(strlen(phydev->drv->name) + 1); 	/* ETHTOOL_A_NAME */	size += nla_total_size(strlen(dev_name(&phydev->mdio.dev)) + 1); 	/* ETHTOOL_A_PHY_UPSTREAM_TYPE */	size += nla_total_size(sizeof(u32)); 	if (phy_on_sfp(phydev)) {		const char *upstream_sfp_name = sfp_get_name(pdn->parent_sfp_bus); 		/* ETHTOOL_A_PHY_UPSTREAM_SFP_NAME */		if (upstream_sfp_name)			size += nla_total_size(strlen(upstream_sfp_name) + 1); 		/* ETHTOOL_A_PHY_UPSTREAM_INDEX */		size += nla_total_size(sizeof(u32));	} 	/* ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME */	if (phydev->sfp_bus) {		const char *sfp_name = sfp_get_name(phydev->sfp_bus); 		if (sfp_name)			size += nla_total_size(strlen(sfp_name) + 1);	} 	return size;} static intethnl_phy_fill_reply(const struct ethnl_req_info *req_base, struct sk_buff *skb){	struct phy_req_info *req_info = PHY_REQINFO(req_base);	struct phy_device_node *pdn = req_info->pdn;	struct phy_device *phydev = pdn->phy;	enum phy_upstream ptype; 	ptype = pdn->upstream_type; 	if (nla_put_u32(skb, ETHTOOL_A_PHY_INDEX, phydev->phyindex) ||	    nla_put_string(skb, ETHTOOL_A_PHY_NAME, dev_name(&phydev->mdio.dev)) ||	    nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_TYPE, ptype))		return -EMSGSIZE; 	if (phydev->drv &&	    nla_put_string(skb, ETHTOOL_A_PHY_DRVNAME, phydev->drv->name))		return -EMSGSIZE; 	if (ptype == PHY_UPSTREAM_PHY) {		struct phy_device *upstream = pdn->upstream.phydev;		const char *sfp_upstream_name; 		/* Parent index */		if (nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_INDEX, upstream->phyindex))			return -EMSGSIZE; 		if (pdn->parent_sfp_bus) {			sfp_upstream_name = sfp_get_name(pdn->parent_sfp_bus);			if (sfp_upstream_name &&			    nla_put_string(skb, ETHTOOL_A_PHY_UPSTREAM_SFP_NAME,					   sfp_upstream_name))				return -EMSGSIZE;		}	} 	if (phydev->sfp_bus) {		const char *sfp_name = sfp_get_name(phydev->sfp_bus); 		if (sfp_name &&		    nla_put_string(skb, ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME,				   sfp_name))			return -EMSGSIZE;	} 	return 0;} static int ethnl_phy_parse_request(struct ethnl_req_info *req_base,				   struct nlattr **tb,				   struct netlink_ext_ack *extack){	struct phy_link_topology *topo = req_base->dev->link_topo;	struct phy_req_info *req_info = PHY_REQINFO(req_base);	struct phy_device *phydev; 	phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_PHY_HEADER],				      extack);	if (!phydev)		return 0; 	if (IS_ERR(phydev))		return PTR_ERR(phydev); 	if (!topo)		return 0; 	req_info->pdn = xa_load(&topo->phys, phydev->phyindex); 	return 0;} int ethnl_phy_doit(struct sk_buff *skb, struct genl_info *info){	struct phy_req_info req_info = {};	struct nlattr **tb = info->attrs;	struct sk_buff *rskb;	void *reply_payload;	int reply_len;	int ret; 	ret = ethnl_parse_header_dev_get(&req_info.base,					 tb[ETHTOOL_A_PHY_HEADER],					 genl_info_net(info), info->extack,					 true);	if (ret < 0)		return ret; 	rtnl_lock(); 	ret = ethnl_phy_parse_request(&req_info.base, tb, info->extack);	if (ret < 0)		goto err_unlock_rtnl; 	/* No PHY, return early */	if (!req_info.pdn)		goto err_unlock_rtnl; 	ret = ethnl_phy_reply_size(&req_info.base, info->extack);	if (ret < 0)		goto err_unlock_rtnl;	reply_len = ret + ethnl_reply_header_size(); 	rskb = ethnl_reply_init(reply_len, req_info.base.dev,				ETHTOOL_MSG_PHY_GET_REPLY,				ETHTOOL_A_PHY_HEADER,				info, &reply_payload);	if (!rskb) {		ret = -ENOMEM;		goto err_unlock_rtnl;	} 	ret = ethnl_phy_fill_reply(&req_info.base, rskb);	if (ret)		goto err_free_msg; 	rtnl_unlock();	ethnl_parse_header_dev_put(&req_info.base);	genlmsg_end(rskb, reply_payload); 	return genlmsg_reply(rskb, info); err_free_msg:	nlmsg_free(rskb);err_unlock_rtnl:	rtnl_unlock();	ethnl_parse_header_dev_put(&req_info.base);	return ret;} struct ethnl_phy_dump_ctx {	struct phy_req_info	*phy_req_info;	unsigned long ifindex;	unsigned long phy_index;}; int ethnl_phy_start(struct netlink_callback *cb){	const struct genl_info *info = genl_info_dump(cb);	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;	int ret; 	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx)); 	ctx->phy_req_info = kzalloc(sizeof(*ctx->phy_req_info), GFP_KERNEL);	if (!ctx->phy_req_info)		return -ENOMEM; 	ret = ethnl_parse_header_dev_get(&ctx->phy_req_info->base,					 info->attrs[ETHTOOL_A_PHY_HEADER],					 sock_net(cb->skb->sk), cb->extack,					 false);	ctx->ifindex = 0;	ctx->phy_index = 0; 	if (ret)		kfree(ctx->phy_req_info); 	return ret;} int ethnl_phy_done(struct netlink_callback *cb){	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx; 	if (ctx->phy_req_info->base.dev)		ethnl_parse_header_dev_put(&ctx->phy_req_info->base); 	kfree(ctx->phy_req_info); 	return 0;} static int ethnl_phy_dump_one_dev(struct sk_buff *skb, struct net_device *dev,				  struct netlink_callback *cb){	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;	struct phy_req_info *pri = ctx->phy_req_info;	struct phy_device_node *pdn;	int ret = 0;	void *ehdr; 	if (!dev->link_topo)		return 0; 	xa_for_each_start(&dev->link_topo->phys, ctx->phy_index, pdn, ctx->phy_index) {		ehdr = ethnl_dump_put(skb, cb, ETHTOOL_MSG_PHY_GET_REPLY);		if (!ehdr) {			ret = -EMSGSIZE;			break;		} 		ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_PHY_HEADER);		if (ret < 0) {			genlmsg_cancel(skb, ehdr);			break;		} 		pri->pdn = pdn;		ret = ethnl_phy_fill_reply(&pri->base, skb);		if (ret < 0) {			genlmsg_cancel(skb, ehdr);			break;		} 		genlmsg_end(skb, ehdr);	} 	return ret;} int ethnl_phy_dumpit(struct sk_buff *skb, struct netlink_callback *cb){	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;	struct net *net = sock_net(skb->sk);	struct net_device *dev;	int ret = 0; 	rtnl_lock(); 	if (ctx->phy_req_info->base.dev) {		ret = ethnl_phy_dump_one_dev(skb, ctx->phy_req_info->base.dev, cb);	} else {		for_each_netdev_dump(net, dev, ctx->ifindex) {			ret = ethnl_phy_dump_one_dev(skb, dev, cb);			if (ret)				break; 			ctx->phy_index = 0;		}	}	rtnl_unlock(); 	return ret;}