From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- net/ethtool/pse-pd.c | 383 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 383 insertions(+) create mode 100644 net/ethtool/pse-pd.c (limited to 'net/ethtool/pse-pd.c') diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c new file mode 100644 index 000000000..757c9e0cc --- /dev/null +++ b/net/ethtool/pse-pd.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// ethtool interface for Ethernet PSE (Power Sourcing Equipment) +// and PD (Powered Device) +// +// Copyright (c) 2022 Pengutronix, Oleksij Rempel +// + +#include +#include +#include +#include + +#include "common.h" +#include "linux/pse-pd/pse.h" +#include "netlink.h" + +struct pse_req_info { + struct ethnl_req_info base; +}; + +struct pse_reply_data { + struct ethnl_reply_data base; + struct ethtool_pse_control_status status; +}; + +#define PSE_REPDATA(__reply_base) \ + container_of(__reply_base, struct pse_reply_data, base) + +/* PSE_GET */ + +const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1] = { + [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy), +}; + +static int pse_get_pse_attributes(struct phy_device *phydev, + struct netlink_ext_ack *extack, + struct pse_reply_data *data) +{ + if (!phydev) { + NL_SET_ERR_MSG(extack, "No PHY found"); + return -EOPNOTSUPP; + } + + if (!phydev->psec) { + NL_SET_ERR_MSG(extack, "No PSE is attached"); + return -EOPNOTSUPP; + } + + memset(&data->status, 0, sizeof(data->status)); + + return pse_ethtool_get_status(phydev->psec, extack, &data->status); +} + +static int pse_prepare_data(const struct ethnl_req_info *req_base, + struct ethnl_reply_data *reply_base, + const struct genl_info *info) +{ + struct pse_reply_data *data = PSE_REPDATA(reply_base); + struct net_device *dev = reply_base->dev; + struct nlattr **tb = info->attrs; + struct phy_device *phydev; + int ret; + + phydev = ethnl_req_get_phydev(req_base, tb, ETHTOOL_A_PSE_HEADER, + info->extack); + if (IS_ERR(phydev)) + return PTR_ERR(phydev); + + ret = ethnl_ops_begin(dev); + if (ret < 0) + return ret; + + ret = pse_get_pse_attributes(phydev, info->extack, data); + + ethnl_ops_complete(dev); + + return ret; +} + +static int pse_reply_size(const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + const struct pse_reply_data *data = PSE_REPDATA(reply_base); + const struct ethtool_pse_control_status *st = &data->status; + int len = 0; + + if (st->pw_d_id) + len += nla_total_size(sizeof(u32)); /* _PSE_PW_D_ID */ + if (st->podl_admin_state > 0) + len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */ + if (st->podl_pw_status > 0) + len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */ + if (st->c33_admin_state > 0) + len += nla_total_size(sizeof(u32)); /* _C33_PSE_ADMIN_STATE */ + if (st->c33_pw_status > 0) + len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_D_STATUS */ + if (st->c33_pw_class > 0) + len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_CLASS */ + if (st->c33_actual_pw > 0) + len += nla_total_size(sizeof(u32)); /* _C33_PSE_ACTUAL_PW */ + if (st->c33_ext_state_info.c33_pse_ext_state > 0) { + len += nla_total_size(sizeof(u32)); /* _C33_PSE_EXT_STATE */ + if (st->c33_ext_state_info.__c33_pse_ext_substate > 0) + /* _C33_PSE_EXT_SUBSTATE */ + len += nla_total_size(sizeof(u32)); + } + if (st->c33_avail_pw_limit > 0) + /* _C33_AVAIL_PSE_PW_LIMIT */ + len += nla_total_size(sizeof(u32)); + if (st->c33_pw_limit_nb_ranges > 0) + /* _C33_PSE_PW_LIMIT_RANGES */ + len += st->c33_pw_limit_nb_ranges * + (nla_total_size(0) + + nla_total_size(sizeof(u32)) * 2); + if (st->prio_max) + /* _PSE_PRIO_MAX + _PSE_PRIO */ + len += nla_total_size(sizeof(u32)) * 2; + + return len; +} + +static int pse_put_pw_limit_ranges(struct sk_buff *skb, + const struct ethtool_pse_control_status *st) +{ + const struct ethtool_c33_pse_pw_limit_range *pw_limit_ranges; + int i; + + pw_limit_ranges = st->c33_pw_limit_ranges; + for (i = 0; i < st->c33_pw_limit_nb_ranges; i++) { + struct nlattr *nest; + + nest = nla_nest_start(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_RANGES); + if (!nest) + return -EMSGSIZE; + + if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MIN, + pw_limit_ranges->min) || + nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_LIMIT_MAX, + pw_limit_ranges->max)) { + nla_nest_cancel(skb, nest); + return -EMSGSIZE; + } + nla_nest_end(skb, nest); + pw_limit_ranges++; + } + + return 0; +} + +static int pse_fill_reply(struct sk_buff *skb, + const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + const struct pse_reply_data *data = PSE_REPDATA(reply_base); + const struct ethtool_pse_control_status *st = &data->status; + + if (st->pw_d_id && + nla_put_u32(skb, ETHTOOL_A_PSE_PW_D_ID, + st->pw_d_id)) + return -EMSGSIZE; + + if (st->podl_admin_state > 0 && + nla_put_u32(skb, ETHTOOL_A_PODL_PSE_ADMIN_STATE, + st->podl_admin_state)) + return -EMSGSIZE; + + if (st->podl_pw_status > 0 && + nla_put_u32(skb, ETHTOOL_A_PODL_PSE_PW_D_STATUS, + st->podl_pw_status)) + return -EMSGSIZE; + + if (st->c33_admin_state > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_ADMIN_STATE, + st->c33_admin_state)) + return -EMSGSIZE; + + if (st->c33_pw_status > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_D_STATUS, + st->c33_pw_status)) + return -EMSGSIZE; + + if (st->c33_pw_class > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_CLASS, + st->c33_pw_class)) + return -EMSGSIZE; + + if (st->c33_actual_pw > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_ACTUAL_PW, + st->c33_actual_pw)) + return -EMSGSIZE; + + if (st->c33_ext_state_info.c33_pse_ext_state > 0) { + if (nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_STATE, + st->c33_ext_state_info.c33_pse_ext_state)) + return -EMSGSIZE; + + if (st->c33_ext_state_info.__c33_pse_ext_substate > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_EXT_SUBSTATE, + st->c33_ext_state_info.__c33_pse_ext_substate)) + return -EMSGSIZE; + } + + if (st->c33_avail_pw_limit > 0 && + nla_put_u32(skb, ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT, + st->c33_avail_pw_limit)) + return -EMSGSIZE; + + if (st->c33_pw_limit_nb_ranges > 0 && + pse_put_pw_limit_ranges(skb, st)) + return -EMSGSIZE; + + if (st->prio_max && + (nla_put_u32(skb, ETHTOOL_A_PSE_PRIO_MAX, st->prio_max) || + nla_put_u32(skb, ETHTOOL_A_PSE_PRIO, st->prio))) + return -EMSGSIZE; + + return 0; +} + +static void pse_cleanup_data(struct ethnl_reply_data *reply_base) +{ + const struct pse_reply_data *data = PSE_REPDATA(reply_base); + + kfree(data->status.c33_pw_limit_ranges); +} + +/* PSE_SET */ + +const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = { + [ETHTOOL_A_PSE_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy_phy), + [ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] = + NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED, + ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED), + [ETHTOOL_A_C33_PSE_ADMIN_CONTROL] = + NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED, + ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED), + [ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT] = { .type = NLA_U32 }, + [ETHTOOL_A_PSE_PRIO] = { .type = NLA_U32 }, +}; + +static int +ethnl_set_pse_validate(struct phy_device *phydev, struct genl_info *info) +{ + struct nlattr **tb = info->attrs; + + if (IS_ERR_OR_NULL(phydev)) { + NL_SET_ERR_MSG(info->extack, "No PHY is attached"); + return -EOPNOTSUPP; + } + + if (!phydev->psec) { + NL_SET_ERR_MSG(info->extack, "No PSE is attached"); + return -EOPNOTSUPP; + } + + if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] && + !pse_has_podl(phydev->psec)) { + NL_SET_ERR_MSG_ATTR(info->extack, + tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL], + "setting PoDL PSE admin control not supported"); + return -EOPNOTSUPP; + } + if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] && + !pse_has_c33(phydev->psec)) { + NL_SET_ERR_MSG_ATTR(info->extack, + tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL], + "setting C33 PSE admin control not supported"); + return -EOPNOTSUPP; + } + + return 0; +} + +static int +ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info) +{ + struct nlattr **tb = info->attrs; + struct phy_device *phydev; + int ret; + + phydev = ethnl_req_get_phydev(req_info, tb, ETHTOOL_A_PSE_HEADER, + info->extack); + ret = ethnl_set_pse_validate(phydev, info); + if (ret) + return ret; + + if (tb[ETHTOOL_A_PSE_PRIO]) { + unsigned int prio; + + prio = nla_get_u32(tb[ETHTOOL_A_PSE_PRIO]); + ret = pse_ethtool_set_prio(phydev->psec, info->extack, prio); + if (ret) + return ret; + } + + if (tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]) { + unsigned int pw_limit; + + pw_limit = nla_get_u32(tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]); + ret = pse_ethtool_set_pw_limit(phydev->psec, info->extack, + pw_limit); + if (ret) + return ret; + } + + /* These values are already validated by the ethnl_pse_set_policy */ + if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] || + tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) { + struct pse_control_config config = {}; + + if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]) + config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]); + if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]) + config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]); + + /* pse_ethtool_set_config() will do nothing if the config + * is zero + */ + ret = pse_ethtool_set_config(phydev->psec, info->extack, + &config); + if (ret) + return ret; + } + + /* Return errno or zero - PSE has no notification */ + return ret; +} + +const struct ethnl_request_ops ethnl_pse_request_ops = { + .request_cmd = ETHTOOL_MSG_PSE_GET, + .reply_cmd = ETHTOOL_MSG_PSE_GET_REPLY, + .hdr_attr = ETHTOOL_A_PSE_HEADER, + .req_info_size = sizeof(struct pse_req_info), + .reply_data_size = sizeof(struct pse_reply_data), + + .prepare_data = pse_prepare_data, + .reply_size = pse_reply_size, + .fill_reply = pse_fill_reply, + .cleanup_data = pse_cleanup_data, + + .set = ethnl_set_pse, + /* PSE has no notification */ +}; + +void ethnl_pse_send_ntf(struct net_device *netdev, unsigned long notifs) +{ + void *reply_payload; + struct sk_buff *skb; + int reply_len; + int ret; + + ASSERT_RTNL(); + + if (!netdev || !notifs) + return; + + reply_len = ethnl_reply_header_size() + + nla_total_size(sizeof(u32)); /* _PSE_NTF_EVENTS */ + + skb = genlmsg_new(reply_len, GFP_KERNEL); + if (!skb) + return; + + reply_payload = ethnl_bcastmsg_put(skb, ETHTOOL_MSG_PSE_NTF); + if (!reply_payload) + goto err_skb; + + ret = ethnl_fill_reply_header(skb, netdev, ETHTOOL_A_PSE_NTF_HEADER); + if (ret < 0) + goto err_skb; + + if (nla_put_uint(skb, ETHTOOL_A_PSE_NTF_EVENTS, notifs)) + goto err_skb; + + genlmsg_end(skb, reply_payload); + ethnl_multicast(skb, netdev); + return; + +err_skb: + nlmsg_free(skb); +} +EXPORT_SYMBOL_GPL(ethnl_pse_send_ntf); -- cgit v1.3.1