| Message ID | 20240709063039.2909536-8-maxime.chevallier@bootlin.com (mailing list archive) |
|---|---|
| State | Deferred |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | Introduce PHY listing and link_topology tracking | expand |
Le 09/07/2024 à 08:30, Maxime Chevallier a écrit : > As we have the ability to track the PHYs connected to a net_device > through the link_topology, we can expose this list to userspace. This > allows userspace to use these identifiers for phy-specific commands and > take the decision of which PHY to target by knowing the link topology. > > Add PHY_GET and PHY_DUMP, which can be a filtered DUMP operation to list > devices on only one interface. > > Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu> > --- > Documentation/networking/ethtool-netlink.rst | 41 +++ > include/uapi/linux/ethtool_netlink.h | 19 ++ > net/ethtool/Makefile | 3 +- > net/ethtool/netlink.c | 9 + > net/ethtool/netlink.h | 5 + > net/ethtool/phy.c | 308 +++++++++++++++++++ > 6 files changed, 384 insertions(+), 1 deletion(-) > create mode 100644 net/ethtool/phy.c > > diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst > index a6ea3716315f..d9f0c0dba1e5 100644 > --- a/Documentation/networking/ethtool-netlink.rst > +++ b/Documentation/networking/ethtool-netlink.rst > @@ -2182,6 +2182,46 @@ string. > The ``ETHTOOL_A_MODULE_FW_FLASH_DONE`` and ``ETHTOOL_A_MODULE_FW_FLASH_TOTAL`` > attributes encode the completed and total amount of work, respectively. > > +PHY_GET > +======= > + > +Retrieve information about a given Ethernet PHY sitting on the link. The DO > +operation returns all available information about dev->phydev. User can also > +specify a PHY_INDEX, in which case the DO request returns information about that > +specific PHY. > +As there can be more than one PHY, the DUMP operation can be used to list the PHYs > +present on a given interface, by passing an interface index or name in > +the dump request. > + > +Request contents: > + > + ==================================== ====== ========================== > + ``ETHTOOL_A_PHY_HEADER`` nested request header > + ==================================== ====== ========================== > + > +Kernel response contents: > + > + ===================================== ====== =============================== > + ``ETHTOOL_A_PHY_HEADER`` nested request header > + ``ETHTOOL_A_PHY_INDEX`` u32 the phy's unique index, that can > + be used for phy-specific > + requests > + ``ETHTOOL_A_PHY_DRVNAME`` string the phy driver name > + ``ETHTOOL_A_PHY_NAME`` string the phy device name > + ``ETHTOOL_A_PHY_UPSTREAM_TYPE`` u32 the type of device this phy is > + connected to > + ``ETHTOOL_A_PHY_UPSTREAM_INDEX`` u32 the PHY index of the upstream > + PHY > + ``ETHTOOL_A_PHY_UPSTREAM_SFP_NAME`` string if this PHY is connected to > + its parent PHY through an SFP > + bus, the name of this sfp bus > + ``ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME`` string if the phy controls an sfp bus, > + the name of the sfp bus > + ===================================== ====== =============================== > + > +When ``ETHTOOL_A_PHY_UPSTREAM_TYPE`` is PHY_UPSTREAM_PHY, the PHY's parent is > +another PHY. > + > Request translation > =================== > > @@ -2289,4 +2329,5 @@ are netlink only. > n/a ``ETHTOOL_MSG_MM_GET`` > n/a ``ETHTOOL_MSG_MM_SET`` > n/a ``ETHTOOL_MSG_MODULE_FW_FLASH_ACT`` > + n/a ``ETHTOOL_MSG_PHY_GET`` > =================================== ===================================== > diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h > index c5af23139e63..6ad32843b32a 100644 > --- a/include/uapi/linux/ethtool_netlink.h > +++ b/include/uapi/linux/ethtool_netlink.h > @@ -58,6 +58,7 @@ enum { > ETHTOOL_MSG_MM_GET, > ETHTOOL_MSG_MM_SET, > ETHTOOL_MSG_MODULE_FW_FLASH_ACT, > + ETHTOOL_MSG_PHY_GET, > > /* add new constants above here */ > __ETHTOOL_MSG_USER_CNT, > @@ -111,6 +112,8 @@ enum { > ETHTOOL_MSG_MM_GET_REPLY, > ETHTOOL_MSG_MM_NTF, > ETHTOOL_MSG_MODULE_FW_FLASH_NTF, > + ETHTOOL_MSG_PHY_GET_REPLY, > + ETHTOOL_MSG_PHY_NTF, > > /* add new constants above here */ > __ETHTOOL_MSG_KERNEL_CNT, > @@ -1050,6 +1053,22 @@ enum { > ETHTOOL_A_MODULE_FW_FLASH_MAX = (__ETHTOOL_A_MODULE_FW_FLASH_CNT - 1) > }; > > +enum { > + ETHTOOL_A_PHY_UNSPEC, > + ETHTOOL_A_PHY_HEADER, /* nest - _A_HEADER_* */ > + ETHTOOL_A_PHY_INDEX, /* u32 */ > + ETHTOOL_A_PHY_DRVNAME, /* string */ > + ETHTOOL_A_PHY_NAME, /* string */ > + ETHTOOL_A_PHY_UPSTREAM_TYPE, /* u32 */ > + ETHTOOL_A_PHY_UPSTREAM_INDEX, /* u32 */ > + ETHTOOL_A_PHY_UPSTREAM_SFP_NAME, /* string */ > + ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME, /* string */ > + > + /* add new constants above here */ > + __ETHTOOL_A_PHY_CNT, > + ETHTOOL_A_PHY_MAX = (__ETHTOOL_A_PHY_CNT - 1) > +}; > + > /* generic netlink info */ > #define ETHTOOL_GENL_NAME "ethtool" > #define ETHTOOL_GENL_VERSION 1 > diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile > index 9a190635fe95..9b540644ba31 100644 > --- a/net/ethtool/Makefile > +++ b/net/ethtool/Makefile > @@ -8,4 +8,5 @@ ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.o \ > linkstate.o debug.o wol.o features.o privflags.o rings.o \ > channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \ > tunnels.o fec.o eeprom.o stats.o phc_vclocks.o mm.o \ > - module.o cmis_fw_update.o cmis_cdb.o pse-pd.o plca.o mm.o > + module.o cmis_fw_update.o cmis_cdb.o pse-pd.o plca.o mm.o \ > + phy.o > diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c > index 7b95571a6efb..153d34dbc48a 100644 > --- a/net/ethtool/netlink.c > +++ b/net/ethtool/netlink.c > @@ -1232,6 +1232,15 @@ static const struct genl_ops ethtool_genl_ops[] = { > .policy = ethnl_module_fw_flash_act_policy, > .maxattr = ARRAY_SIZE(ethnl_module_fw_flash_act_policy) - 1, > }, > + { > + .cmd = ETHTOOL_MSG_PHY_GET, > + .doit = ethnl_phy_doit, > + .start = ethnl_phy_start, > + .dumpit = ethnl_phy_dumpit, > + .done = ethnl_phy_done, > + .policy = ethnl_phy_get_policy, > + .maxattr = ARRAY_SIZE(ethnl_phy_get_policy) - 1, > + }, > }; > > static const struct genl_multicast_group ethtool_nl_mcgrps[] = { > diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h > index 4db16048f8d4..4a702dc853bf 100644 > --- a/net/ethtool/netlink.h > +++ b/net/ethtool/netlink.h > @@ -484,6 +484,7 @@ extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADE > extern const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1]; > extern const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1]; > extern const struct nla_policy ethnl_module_fw_flash_act_policy[ETHTOOL_A_MODULE_FW_FLASH_PASSWORD + 1]; > +extern const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1]; > > int ethnl_set_features(struct sk_buff *skb, struct genl_info *info); > int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info); > @@ -492,6 +493,10 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info); > int ethnl_tunnel_info_start(struct netlink_callback *cb); > int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb); > int ethnl_act_module_fw_flash(struct sk_buff *skb, struct genl_info *info); > +int ethnl_phy_start(struct netlink_callback *cb); > +int ethnl_phy_doit(struct sk_buff *skb, struct genl_info *info); > +int ethnl_phy_dumpit(struct sk_buff *skb, struct netlink_callback *cb); > +int ethnl_phy_done(struct netlink_callback *cb); > > extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN]; > extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN]; > diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c > new file mode 100644 > index 000000000000..560dd039c662 > --- /dev/null > +++ b/net/ethtool/phy.c > @@ -0,0 +1,308 @@ > +// 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; > +}
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index a6ea3716315f..d9f0c0dba1e5 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -2182,6 +2182,46 @@ string. The ``ETHTOOL_A_MODULE_FW_FLASH_DONE`` and ``ETHTOOL_A_MODULE_FW_FLASH_TOTAL`` attributes encode the completed and total amount of work, respectively. +PHY_GET +======= + +Retrieve information about a given Ethernet PHY sitting on the link. The DO +operation returns all available information about dev->phydev. User can also +specify a PHY_INDEX, in which case the DO request returns information about that +specific PHY. +As there can be more than one PHY, the DUMP operation can be used to list the PHYs +present on a given interface, by passing an interface index or name in +the dump request. + +Request contents: + + ==================================== ====== ========================== + ``ETHTOOL_A_PHY_HEADER`` nested request header + ==================================== ====== ========================== + +Kernel response contents: + + ===================================== ====== =============================== + ``ETHTOOL_A_PHY_HEADER`` nested request header + ``ETHTOOL_A_PHY_INDEX`` u32 the phy's unique index, that can + be used for phy-specific + requests + ``ETHTOOL_A_PHY_DRVNAME`` string the phy driver name + ``ETHTOOL_A_PHY_NAME`` string the phy device name + ``ETHTOOL_A_PHY_UPSTREAM_TYPE`` u32 the type of device this phy is + connected to + ``ETHTOOL_A_PHY_UPSTREAM_INDEX`` u32 the PHY index of the upstream + PHY + ``ETHTOOL_A_PHY_UPSTREAM_SFP_NAME`` string if this PHY is connected to + its parent PHY through an SFP + bus, the name of this sfp bus + ``ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME`` string if the phy controls an sfp bus, + the name of the sfp bus + ===================================== ====== =============================== + +When ``ETHTOOL_A_PHY_UPSTREAM_TYPE`` is PHY_UPSTREAM_PHY, the PHY's parent is +another PHY. + Request translation =================== @@ -2289,4 +2329,5 @@ are netlink only. n/a ``ETHTOOL_MSG_MM_GET`` n/a ``ETHTOOL_MSG_MM_SET`` n/a ``ETHTOOL_MSG_MODULE_FW_FLASH_ACT`` + n/a ``ETHTOOL_MSG_PHY_GET`` =================================== ===================================== diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h index c5af23139e63..6ad32843b32a 100644 --- a/include/uapi/linux/ethtool_netlink.h +++ b/include/uapi/linux/ethtool_netlink.h @@ -58,6 +58,7 @@ enum { ETHTOOL_MSG_MM_GET, ETHTOOL_MSG_MM_SET, ETHTOOL_MSG_MODULE_FW_FLASH_ACT, + ETHTOOL_MSG_PHY_GET, /* add new constants above here */ __ETHTOOL_MSG_USER_CNT, @@ -111,6 +112,8 @@ enum { ETHTOOL_MSG_MM_GET_REPLY, ETHTOOL_MSG_MM_NTF, ETHTOOL_MSG_MODULE_FW_FLASH_NTF, + ETHTOOL_MSG_PHY_GET_REPLY, + ETHTOOL_MSG_PHY_NTF, /* add new constants above here */ __ETHTOOL_MSG_KERNEL_CNT, @@ -1050,6 +1053,22 @@ enum { ETHTOOL_A_MODULE_FW_FLASH_MAX = (__ETHTOOL_A_MODULE_FW_FLASH_CNT - 1) }; +enum { + ETHTOOL_A_PHY_UNSPEC, + ETHTOOL_A_PHY_HEADER, /* nest - _A_HEADER_* */ + ETHTOOL_A_PHY_INDEX, /* u32 */ + ETHTOOL_A_PHY_DRVNAME, /* string */ + ETHTOOL_A_PHY_NAME, /* string */ + ETHTOOL_A_PHY_UPSTREAM_TYPE, /* u32 */ + ETHTOOL_A_PHY_UPSTREAM_INDEX, /* u32 */ + ETHTOOL_A_PHY_UPSTREAM_SFP_NAME, /* string */ + ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME, /* string */ + + /* add new constants above here */ + __ETHTOOL_A_PHY_CNT, + ETHTOOL_A_PHY_MAX = (__ETHTOOL_A_PHY_CNT - 1) +}; + /* generic netlink info */ #define ETHTOOL_GENL_NAME "ethtool" #define ETHTOOL_GENL_VERSION 1 diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile index 9a190635fe95..9b540644ba31 100644 --- a/net/ethtool/Makefile +++ b/net/ethtool/Makefile @@ -8,4 +8,5 @@ ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.o \ linkstate.o debug.o wol.o features.o privflags.o rings.o \ channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \ tunnels.o fec.o eeprom.o stats.o phc_vclocks.o mm.o \ - module.o cmis_fw_update.o cmis_cdb.o pse-pd.o plca.o mm.o + module.o cmis_fw_update.o cmis_cdb.o pse-pd.o plca.o mm.o \ + phy.o diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c index 7b95571a6efb..153d34dbc48a 100644 --- a/net/ethtool/netlink.c +++ b/net/ethtool/netlink.c @@ -1232,6 +1232,15 @@ static const struct genl_ops ethtool_genl_ops[] = { .policy = ethnl_module_fw_flash_act_policy, .maxattr = ARRAY_SIZE(ethnl_module_fw_flash_act_policy) - 1, }, + { + .cmd = ETHTOOL_MSG_PHY_GET, + .doit = ethnl_phy_doit, + .start = ethnl_phy_start, + .dumpit = ethnl_phy_dumpit, + .done = ethnl_phy_done, + .policy = ethnl_phy_get_policy, + .maxattr = ARRAY_SIZE(ethnl_phy_get_policy) - 1, + }, }; static const struct genl_multicast_group ethtool_nl_mcgrps[] = { diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h index 4db16048f8d4..4a702dc853bf 100644 --- a/net/ethtool/netlink.h +++ b/net/ethtool/netlink.h @@ -484,6 +484,7 @@ extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADE extern const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1]; extern const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1]; extern const struct nla_policy ethnl_module_fw_flash_act_policy[ETHTOOL_A_MODULE_FW_FLASH_PASSWORD + 1]; +extern const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1]; int ethnl_set_features(struct sk_buff *skb, struct genl_info *info); int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info); @@ -492,6 +493,10 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info); int ethnl_tunnel_info_start(struct netlink_callback *cb); int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb); int ethnl_act_module_fw_flash(struct sk_buff *skb, struct genl_info *info); +int ethnl_phy_start(struct netlink_callback *cb); +int ethnl_phy_doit(struct sk_buff *skb, struct genl_info *info); +int ethnl_phy_dumpit(struct sk_buff *skb, struct netlink_callback *cb); +int ethnl_phy_done(struct netlink_callback *cb); extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN]; extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN]; diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c new file mode 100644 index 000000000000..560dd039c662 --- /dev/null +++ b/net/ethtool/phy.c @@ -0,0 +1,308 @@ +// 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; +}
As we have the ability to track the PHYs connected to a net_device through the link_topology, we can expose this list to userspace. This allows userspace to use these identifiers for phy-specific commands and take the decision of which PHY to target by knowing the link topology. Add PHY_GET and PHY_DUMP, which can be a filtered DUMP operation to list devices on only one interface. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> --- Documentation/networking/ethtool-netlink.rst | 41 +++ include/uapi/linux/ethtool_netlink.h | 19 ++ net/ethtool/Makefile | 3 +- net/ethtool/netlink.c | 9 + net/ethtool/netlink.h | 5 + net/ethtool/phy.c | 308 +++++++++++++++++++ 6 files changed, 384 insertions(+), 1 deletion(-) create mode 100644 net/ethtool/phy.c