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// 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_t
ethnl_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 int
ethnl_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->phy)
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;
pri->base.dev = dev;
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;
}
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