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- // SPDX-License-Identifier: GPL-2.0-only
- #include <linux/phy.h>
- #include <linux/ethtool_netlink.h>
- #include "netlink.h"
- #include "common.h"
- /* 802.3 standard allows 100 meters for BaseT cables. However longer
- * cables might work, depending on the quality of the cables and the
- * PHY. So allow testing for up to 150 meters.
- */
- #define MAX_CABLE_LENGTH_CM (150 * 100)
- const struct nla_policy ethnl_cable_test_act_policy[] = {
- [ETHTOOL_A_CABLE_TEST_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
- };
- static int ethnl_cable_test_started(struct phy_device *phydev, u8 cmd)
- {
- struct sk_buff *skb;
- int err = -ENOMEM;
- void *ehdr;
- skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
- if (!skb)
- goto out;
- ehdr = ethnl_bcastmsg_put(skb, cmd);
- if (!ehdr) {
- err = -EMSGSIZE;
- goto out;
- }
- err = ethnl_fill_reply_header(skb, phydev->attached_dev,
- ETHTOOL_A_CABLE_TEST_NTF_HEADER);
- if (err)
- goto out;
- err = nla_put_u8(skb, ETHTOOL_A_CABLE_TEST_NTF_STATUS,
- ETHTOOL_A_CABLE_TEST_NTF_STATUS_STARTED);
- if (err)
- goto out;
- genlmsg_end(skb, ehdr);
- return ethnl_multicast(skb, phydev->attached_dev);
- out:
- nlmsg_free(skb);
- phydev_err(phydev, "%s: Error %pe\n", __func__, ERR_PTR(err));
- return err;
- }
- int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info)
- {
- struct ethnl_req_info req_info = {};
- const struct ethtool_phy_ops *ops;
- struct nlattr **tb = info->attrs;
- struct net_device *dev;
- int ret;
- ret = ethnl_parse_header_dev_get(&req_info,
- tb[ETHTOOL_A_CABLE_TEST_HEADER],
- genl_info_net(info), info->extack,
- true);
- if (ret < 0)
- return ret;
- dev = req_info.dev;
- if (!dev->phydev) {
- ret = -EOPNOTSUPP;
- goto out_dev_put;
- }
- rtnl_lock();
- ops = ethtool_phy_ops;
- if (!ops || !ops->start_cable_test) {
- ret = -EOPNOTSUPP;
- goto out_rtnl;
- }
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- goto out_rtnl;
- ret = ops->start_cable_test(dev->phydev, info->extack);
- ethnl_ops_complete(dev);
- if (!ret)
- ethnl_cable_test_started(dev->phydev,
- ETHTOOL_MSG_CABLE_TEST_NTF);
- out_rtnl:
- rtnl_unlock();
- out_dev_put:
- ethnl_parse_header_dev_put(&req_info);
- return ret;
- }
- int ethnl_cable_test_alloc(struct phy_device *phydev, u8 cmd)
- {
- int err = -ENOMEM;
- /* One TDR sample occupies 20 bytes. For a 150 meter cable,
- * with four pairs, around 12K is needed.
- */
- phydev->skb = genlmsg_new(SZ_16K, GFP_KERNEL);
- if (!phydev->skb)
- goto out;
- phydev->ehdr = ethnl_bcastmsg_put(phydev->skb, cmd);
- if (!phydev->ehdr) {
- err = -EMSGSIZE;
- goto out;
- }
- err = ethnl_fill_reply_header(phydev->skb, phydev->attached_dev,
- ETHTOOL_A_CABLE_TEST_NTF_HEADER);
- if (err)
- goto out;
- err = nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_TEST_NTF_STATUS,
- ETHTOOL_A_CABLE_TEST_NTF_STATUS_COMPLETED);
- if (err)
- goto out;
- phydev->nest = nla_nest_start(phydev->skb,
- ETHTOOL_A_CABLE_TEST_NTF_NEST);
- if (!phydev->nest) {
- err = -EMSGSIZE;
- goto out;
- }
- return 0;
- out:
- nlmsg_free(phydev->skb);
- phydev->skb = NULL;
- return err;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_alloc);
- void ethnl_cable_test_free(struct phy_device *phydev)
- {
- nlmsg_free(phydev->skb);
- phydev->skb = NULL;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_free);
- void ethnl_cable_test_finished(struct phy_device *phydev)
- {
- nla_nest_end(phydev->skb, phydev->nest);
- genlmsg_end(phydev->skb, phydev->ehdr);
- ethnl_multicast(phydev->skb, phydev->attached_dev);
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_finished);
- int ethnl_cable_test_result(struct phy_device *phydev, u8 pair, u8 result)
- {
- struct nlattr *nest;
- int ret = -EMSGSIZE;
- nest = nla_nest_start(phydev->skb, ETHTOOL_A_CABLE_NEST_RESULT);
- if (!nest)
- return -EMSGSIZE;
- if (nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_RESULT_PAIR, pair))
- goto err;
- if (nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_RESULT_CODE, result))
- goto err;
- nla_nest_end(phydev->skb, nest);
- return 0;
- err:
- nla_nest_cancel(phydev->skb, nest);
- return ret;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_result);
- int ethnl_cable_test_fault_length(struct phy_device *phydev, u8 pair, u32 cm)
- {
- struct nlattr *nest;
- int ret = -EMSGSIZE;
- nest = nla_nest_start(phydev->skb,
- ETHTOOL_A_CABLE_NEST_FAULT_LENGTH);
- if (!nest)
- return -EMSGSIZE;
- if (nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_FAULT_LENGTH_PAIR, pair))
- goto err;
- if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_FAULT_LENGTH_CM, cm))
- goto err;
- nla_nest_end(phydev->skb, nest);
- return 0;
- err:
- nla_nest_cancel(phydev->skb, nest);
- return ret;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_fault_length);
- struct cable_test_tdr_req_info {
- struct ethnl_req_info base;
- };
- static const struct nla_policy cable_test_tdr_act_cfg_policy[] = {
- [ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST] = { .type = NLA_U32 },
- [ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST] = { .type = NLA_U32 },
- [ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP] = { .type = NLA_U32 },
- [ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR] = { .type = NLA_U8 },
- };
- const struct nla_policy ethnl_cable_test_tdr_act_policy[] = {
- [ETHTOOL_A_CABLE_TEST_TDR_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
- [ETHTOOL_A_CABLE_TEST_TDR_CFG] = { .type = NLA_NESTED },
- };
- /* CABLE_TEST_TDR_ACT */
- static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
- struct genl_info *info,
- struct phy_tdr_config *cfg)
- {
- struct nlattr *tb[ARRAY_SIZE(cable_test_tdr_act_cfg_policy)];
- int ret;
- cfg->first = 100;
- cfg->step = 100;
- cfg->last = MAX_CABLE_LENGTH_CM;
- cfg->pair = PHY_PAIR_ALL;
- if (!nest)
- return 0;
- ret = nla_parse_nested(tb,
- ARRAY_SIZE(cable_test_tdr_act_cfg_policy) - 1,
- nest, cable_test_tdr_act_cfg_policy,
- info->extack);
- if (ret < 0)
- return ret;
- if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST])
- cfg->first = nla_get_u32(
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST]);
- if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST])
- cfg->last = nla_get_u32(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST]);
- if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP])
- cfg->step = nla_get_u32(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP]);
- if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR]) {
- cfg->pair = nla_get_u8(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR]);
- if (cfg->pair > ETHTOOL_A_CABLE_PAIR_D) {
- NL_SET_ERR_MSG_ATTR(
- info->extack,
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR],
- "invalid pair parameter");
- return -EINVAL;
- }
- }
- if (cfg->first > MAX_CABLE_LENGTH_CM) {
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST],
- "invalid first parameter");
- return -EINVAL;
- }
- if (cfg->last > MAX_CABLE_LENGTH_CM) {
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST],
- "invalid last parameter");
- return -EINVAL;
- }
- if (cfg->first > cfg->last) {
- NL_SET_ERR_MSG(info->extack, "invalid first/last parameter");
- return -EINVAL;
- }
- if (!cfg->step) {
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP],
- "invalid step parameter");
- return -EINVAL;
- }
- if (cfg->step > (cfg->last - cfg->first)) {
- NL_SET_ERR_MSG_ATTR(info->extack,
- tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP],
- "step parameter too big");
- return -EINVAL;
- }
- return 0;
- }
- int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info)
- {
- struct ethnl_req_info req_info = {};
- const struct ethtool_phy_ops *ops;
- struct nlattr **tb = info->attrs;
- struct phy_tdr_config cfg;
- struct net_device *dev;
- int ret;
- ret = ethnl_parse_header_dev_get(&req_info,
- tb[ETHTOOL_A_CABLE_TEST_TDR_HEADER],
- genl_info_net(info), info->extack,
- true);
- if (ret < 0)
- return ret;
- dev = req_info.dev;
- if (!dev->phydev) {
- ret = -EOPNOTSUPP;
- goto out_dev_put;
- }
- ret = ethnl_act_cable_test_tdr_cfg(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG],
- info, &cfg);
- if (ret)
- goto out_dev_put;
- rtnl_lock();
- ops = ethtool_phy_ops;
- if (!ops || !ops->start_cable_test_tdr) {
- ret = -EOPNOTSUPP;
- goto out_rtnl;
- }
- ret = ethnl_ops_begin(dev);
- if (ret < 0)
- goto out_rtnl;
- ret = ops->start_cable_test_tdr(dev->phydev, info->extack, &cfg);
- ethnl_ops_complete(dev);
- if (!ret)
- ethnl_cable_test_started(dev->phydev,
- ETHTOOL_MSG_CABLE_TEST_TDR_NTF);
- out_rtnl:
- rtnl_unlock();
- out_dev_put:
- ethnl_parse_header_dev_put(&req_info);
- return ret;
- }
- int ethnl_cable_test_amplitude(struct phy_device *phydev,
- u8 pair, s16 mV)
- {
- struct nlattr *nest;
- int ret = -EMSGSIZE;
- nest = nla_nest_start(phydev->skb,
- ETHTOOL_A_CABLE_TDR_NEST_AMPLITUDE);
- if (!nest)
- return -EMSGSIZE;
- if (nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_AMPLITUDE_PAIR, pair))
- goto err;
- if (nla_put_u16(phydev->skb, ETHTOOL_A_CABLE_AMPLITUDE_mV, mV))
- goto err;
- nla_nest_end(phydev->skb, nest);
- return 0;
- err:
- nla_nest_cancel(phydev->skb, nest);
- return ret;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_amplitude);
- int ethnl_cable_test_pulse(struct phy_device *phydev, u16 mV)
- {
- struct nlattr *nest;
- int ret = -EMSGSIZE;
- nest = nla_nest_start(phydev->skb, ETHTOOL_A_CABLE_TDR_NEST_PULSE);
- if (!nest)
- return -EMSGSIZE;
- if (nla_put_u16(phydev->skb, ETHTOOL_A_CABLE_PULSE_mV, mV))
- goto err;
- nla_nest_end(phydev->skb, nest);
- return 0;
- err:
- nla_nest_cancel(phydev->skb, nest);
- return ret;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_pulse);
- int ethnl_cable_test_step(struct phy_device *phydev, u32 first, u32 last,
- u32 step)
- {
- struct nlattr *nest;
- int ret = -EMSGSIZE;
- nest = nla_nest_start(phydev->skb, ETHTOOL_A_CABLE_TDR_NEST_STEP);
- if (!nest)
- return -EMSGSIZE;
- if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_FIRST_DISTANCE,
- first))
- goto err;
- if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_LAST_DISTANCE, last))
- goto err;
- if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_STEP_DISTANCE, step))
- goto err;
- nla_nest_end(phydev->skb, nest);
- return 0;
- err:
- nla_nest_cancel(phydev->skb, nest);
- return ret;
- }
- EXPORT_SYMBOL_GPL(ethnl_cable_test_step);
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