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authorMaxime Chevallier <maxime.chevallier@bootlin.com>2023-12-21 21:00:40 +0300
committerDavid S. Miller <davem@davemloft.net>2024-01-01 21:38:57 +0300
commit63d5eaf35ac36cad00cfb3809d794ef0078c822b (patch)
tree0760bec6f78c17f0549a8f5ef43f0883d2e0e50d /net
parentc29451aefcb42359905d18678de38e52eccb3bb5 (diff)
downloadlinux-63d5eaf35ac36cad00cfb3809d794ef0078c822b.tar.xz
net: ethtool: Introduce a command to list PHYs on an interface
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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ethtool/Makefile2
-rw-r--r--net/ethtool/netlink.c9
-rw-r--r--net/ethtool/netlink.h5
-rw-r--r--net/ethtool/phy.c306
4 files changed, 321 insertions, 1 deletions
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 504f954a1b28..0ccd0e9afd3f 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -8,4 +8,4 @@ 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 pse-pd.o plca.o mm.o
+ module.o pse-pd.o plca.o mm.o phy.o
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 1c26766ce996..92b0dd8ca046 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -1153,6 +1153,15 @@ static const struct genl_ops ethtool_genl_ops[] = {
.policy = ethnl_mm_set_policy,
.maxattr = ARRAY_SIZE(ethnl_mm_set_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 def84e2def9e..5e6a43e35a09 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -444,6 +444,7 @@ extern const struct nla_policy ethnl_plca_set_cfg_policy[ETHTOOL_A_PLCA_MAX + 1]
extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADER + 1];
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_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);
@@ -451,6 +452,10 @@ int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info);
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_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..5add2840aaeb
--- /dev/null
+++ b/net/ethtool/phy.c
@@ -0,0 +1,306 @@
+// 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_link_topology *topo;
+ struct phy_device_node *pdn;
+ struct phy_device *phydev;
+ unsigned long index;
+ size_t size;
+
+ ASSERT_RTNL();
+
+ topo = &req_base->dev->link_topo;
+
+ size = nla_total_size(0);
+
+ xa_for_each(&topo->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) + 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(u8));
+
+ /* ETHTOOL_A_PHY_ID */
+ 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;
+ struct nlattr *nest;
+
+ ptype = pdn->upstream_type;
+
+ if (nla_put_u32(skb, ETHTOOL_A_PHY_INDEX, phydev->phyindex) ||
+ nla_put_string(skb, ETHTOOL_A_PHY_DRVNAME, phydev->drv->name) ||
+ nla_put_string(skb, ETHTOOL_A_PHY_NAME, dev_name(&phydev->mdio.dev)) ||
+ nla_put_u8(skb, ETHTOOL_A_PHY_UPSTREAM_TYPE, ptype) ||
+ nla_put_u32(skb, ETHTOOL_A_PHY_ID, phydev->phy_id))
+ return -EMSGSIZE;
+
+ if (ptype == PHY_UPSTREAM_PHY) {
+ struct phy_device *upstream = pdn->upstream.phydev;
+ const char *sfp_upstream_name;
+
+ nest = nla_nest_start(skb, ETHTOOL_A_PHY_UPSTREAM);
+ if (!nest)
+ return -EMSGSIZE;
+
+ /* 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;
+ }
+
+ nla_nest_end(skb, nest);
+ }
+
+ 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 phy_link_topology *topo = &req_base->dev->link_topo;
+ struct phy_req_info *req_info = PHY_REQINFO(req_base);
+ struct phy_device_node *pdn;
+
+ if (!req_base->phydev)
+ return 0;
+
+ pdn = xa_load(&topo->phys, req_base->phydev->phyindex);
+ memcpy(&req_info->pdn, pdn, sizeof(*pdn));
+
+ 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);
+ 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;
+};
+
+int ethnl_phy_start(struct netlink_callback *cb)
+{
+ const struct genl_dumpit_info *info = genl_dumpit_info(cb);
+ struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
+ struct nlattr **tb = info->info.attrs;
+ 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,
+ tb[ETHTOOL_A_PHY_HEADER],
+ sock_net(cb->skb->sk), cb->extack,
+ false);
+ return ret;
+}
+
+int ethnl_phy_done(struct netlink_callback *cb)
+{
+ struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
+
+ 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;
+ unsigned long index = 1;
+ int ret = 0;
+ void *ehdr;
+
+ pri->base.dev = dev;
+
+ xa_for_each(&dev->link_topo.phys, index, pdn) {
+ 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;
+ }
+
+ memcpy(&pri->pdn, pdn, sizeof(*pdn));
+ ret = ethnl_phy_fill_reply(&pri->base, skb);
+
+ 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);
+ unsigned long ifindex = 1;
+ 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);
+ ethnl_parse_header_dev_put(&ctx->phy_req_info->base);
+ ctx->phy_req_info->base.dev = NULL;
+ } else {
+ for_each_netdev_dump(net, dev, ifindex) {
+ ret = ethnl_phy_dump_one_dev(skb, dev, cb);
+ if (ret)
+ break;
+ }
+ }
+ rtnl_unlock();
+
+ if (ret == -EMSGSIZE && skb->len)
+ return skb->len;
+ return ret;
+}
+