From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- net/smc/smc_stats.c | 419 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 419 insertions(+) create mode 100644 net/smc/smc_stats.c (limited to 'net/smc/smc_stats.c') diff --git a/net/smc/smc_stats.c b/net/smc/smc_stats.c new file mode 100644 index 000000000..59db61182 --- /dev/null +++ b/net/smc/smc_stats.c @@ -0,0 +1,419 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Shared Memory Communications over RDMA (SMC-R) and RoCE + * + * SMC statistics netlink routines + * + * Copyright IBM Corp. 2021 + * + * Author(s): Guvenc Gulce + */ +#include +#include +#include +#include +#include +#include +#include +#include "smc_netlink.h" +#include "smc_stats.h" + +int smc_stats_init(struct net *net) +{ + net->smc.fback_rsn = kzalloc_obj(*net->smc.fback_rsn); + if (!net->smc.fback_rsn) + goto err_fback; + net->smc.smc_stats = alloc_percpu(struct smc_stats); + if (!net->smc.smc_stats) + goto err_stats; + mutex_init(&net->smc.mutex_fback_rsn); + return 0; + +err_stats: + kfree(net->smc.fback_rsn); +err_fback: + return -ENOMEM; +} + +void smc_stats_exit(struct net *net) +{ + kfree(net->smc.fback_rsn); + if (net->smc.smc_stats) + free_percpu(net->smc.smc_stats); +} + +static int smc_nl_fill_stats_rmb_data(struct sk_buff *skb, + struct smc_stats *stats, int tech, + int type) +{ + struct smc_stats_rmbcnt *stats_rmb_cnt; + struct nlattr *attrs; + + if (type == SMC_NLA_STATS_T_TX_RMB_STATS) + stats_rmb_cnt = &stats->smc[tech].rmb_tx; + else + stats_rmb_cnt = &stats->smc[tech].rmb_rx; + + attrs = nla_nest_start(skb, type); + if (!attrs) + goto errout; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_REUSE_CNT, + stats_rmb_cnt->reuse_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_SIZE_SM_PEER_CNT, + stats_rmb_cnt->buf_size_small_peer_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_SIZE_SM_CNT, + stats_rmb_cnt->buf_size_small_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_FULL_PEER_CNT, + stats_rmb_cnt->buf_full_peer_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_FULL_CNT, + stats_rmb_cnt->buf_full_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_ALLOC_CNT, + stats_rmb_cnt->alloc_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_RMB_DGRADE_CNT, + stats_rmb_cnt->dgrade_cnt, + SMC_NLA_STATS_RMB_PAD)) + goto errattr; + + nla_nest_end(skb, attrs); + return 0; + +errattr: + nla_nest_cancel(skb, attrs); +errout: + return -EMSGSIZE; +} + +static int smc_nl_fill_stats_bufsize_data(struct sk_buff *skb, + struct smc_stats *stats, int tech, + int type) +{ + struct smc_stats_memsize *stats_pload; + struct nlattr *attrs; + + if (type == SMC_NLA_STATS_T_TXPLOAD_SIZE) + stats_pload = &stats->smc[tech].tx_pd; + else if (type == SMC_NLA_STATS_T_RXPLOAD_SIZE) + stats_pload = &stats->smc[tech].rx_pd; + else if (type == SMC_NLA_STATS_T_TX_RMB_SIZE) + stats_pload = &stats->smc[tech].tx_rmbsize; + else if (type == SMC_NLA_STATS_T_RX_RMB_SIZE) + stats_pload = &stats->smc[tech].rx_rmbsize; + else + goto errout; + + attrs = nla_nest_start(skb, type); + if (!attrs) + goto errout; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_8K, + stats_pload->buf[SMC_BUF_8K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_16K, + stats_pload->buf[SMC_BUF_16K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_32K, + stats_pload->buf[SMC_BUF_32K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_64K, + stats_pload->buf[SMC_BUF_64K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_128K, + stats_pload->buf[SMC_BUF_128K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_256K, + stats_pload->buf[SMC_BUF_256K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_512K, + stats_pload->buf[SMC_BUF_512K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_1024K, + stats_pload->buf[SMC_BUF_1024K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_PLOAD_G_1024K, + stats_pload->buf[SMC_BUF_G_1024K], + SMC_NLA_STATS_PLOAD_PAD)) + goto errattr; + + nla_nest_end(skb, attrs); + return 0; + +errattr: + nla_nest_cancel(skb, attrs); +errout: + return -EMSGSIZE; +} + +static int smc_nl_fill_stats_tech_data(struct sk_buff *skb, + struct smc_stats *stats, int tech) +{ + struct smc_stats_tech *smc_tech; + struct nlattr *attrs; + + smc_tech = &stats->smc[tech]; + if (tech == SMC_TYPE_D) + attrs = nla_nest_start(skb, SMC_NLA_STATS_SMCD_TECH); + else + attrs = nla_nest_start(skb, SMC_NLA_STATS_SMCR_TECH); + + if (!attrs) + goto errout; + if (smc_nl_fill_stats_rmb_data(skb, stats, tech, + SMC_NLA_STATS_T_TX_RMB_STATS)) + goto errattr; + if (smc_nl_fill_stats_rmb_data(skb, stats, tech, + SMC_NLA_STATS_T_RX_RMB_STATS)) + goto errattr; + if (smc_nl_fill_stats_bufsize_data(skb, stats, tech, + SMC_NLA_STATS_T_TXPLOAD_SIZE)) + goto errattr; + if (smc_nl_fill_stats_bufsize_data(skb, stats, tech, + SMC_NLA_STATS_T_RXPLOAD_SIZE)) + goto errattr; + if (smc_nl_fill_stats_bufsize_data(skb, stats, tech, + SMC_NLA_STATS_T_TX_RMB_SIZE)) + goto errattr; + if (smc_nl_fill_stats_bufsize_data(skb, stats, tech, + SMC_NLA_STATS_T_RX_RMB_SIZE)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CLNT_V1_SUCC, + smc_tech->clnt_v1_succ_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CLNT_V2_SUCC, + smc_tech->clnt_v2_succ_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SRV_V1_SUCC, + smc_tech->srv_v1_succ_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SRV_V2_SUCC, + smc_tech->srv_v2_succ_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_RX_BYTES, + smc_tech->rx_bytes, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_TX_BYTES, + smc_tech->tx_bytes, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_uint(skb, SMC_NLA_STATS_T_RX_RMB_USAGE, + smc_tech->rx_rmbuse)) + goto errattr; + if (nla_put_uint(skb, SMC_NLA_STATS_T_TX_RMB_USAGE, + smc_tech->tx_rmbuse)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_RX_CNT, + smc_tech->rx_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_TX_CNT, + smc_tech->tx_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SENDPAGE_CNT, + 0, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_CORK_CNT, + smc_tech->cork_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_NDLY_CNT, + smc_tech->ndly_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_SPLICE_CNT, + smc_tech->splice_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_T_URG_DATA_CNT, + smc_tech->urg_data_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + + nla_nest_end(skb, attrs); + return 0; + +errattr: + nla_nest_cancel(skb, attrs); +errout: + return -EMSGSIZE; +} + +int smc_nl_get_stats(struct sk_buff *skb, + struct netlink_callback *cb) +{ + struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); + struct net *net = sock_net(skb->sk); + struct smc_stats *stats; + struct nlattr *attrs; + int cpu, i, size; + void *nlh; + u64 *src; + u64 *sum; + + if (cb_ctx->pos[0]) + goto errmsg; + nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + &smc_gen_nl_family, NLM_F_MULTI, + SMC_NETLINK_GET_STATS); + if (!nlh) + goto errmsg; + + attrs = nla_nest_start(skb, SMC_GEN_STATS); + if (!attrs) + goto errnest; + stats = kzalloc_obj(*stats); + if (!stats) + goto erralloc; + size = sizeof(*stats) / sizeof(u64); + for_each_possible_cpu(cpu) { + src = (u64 *)per_cpu_ptr(net->smc.smc_stats, cpu); + sum = (u64 *)stats; + for (i = 0; i < size; i++) + *(sum++) += *(src++); + } + if (smc_nl_fill_stats_tech_data(skb, stats, SMC_TYPE_D)) + goto errattr; + if (smc_nl_fill_stats_tech_data(skb, stats, SMC_TYPE_R)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_CLNT_HS_ERR_CNT, + stats->clnt_hshake_err_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_STATS_SRV_HS_ERR_CNT, + stats->srv_hshake_err_cnt, + SMC_NLA_STATS_PAD)) + goto errattr; + + nla_nest_end(skb, attrs); + genlmsg_end(skb, nlh); + cb_ctx->pos[0] = 1; + kfree(stats); + return skb->len; + +errattr: + kfree(stats); +erralloc: + nla_nest_cancel(skb, attrs); +errnest: + genlmsg_cancel(skb, nlh); +errmsg: + return skb->len; +} + +static int smc_nl_get_fback_details(struct sk_buff *skb, + struct netlink_callback *cb, int pos, + bool is_srv) +{ + struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); + struct net *net = sock_net(skb->sk); + int cnt_reported = cb_ctx->pos[2]; + struct smc_stats_fback *trgt_arr; + struct nlattr *attrs; + int rc = 0; + void *nlh; + + if (is_srv) + trgt_arr = &net->smc.fback_rsn->srv[0]; + else + trgt_arr = &net->smc.fback_rsn->clnt[0]; + if (!trgt_arr[pos].fback_code) + return -ENODATA; + nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + &smc_gen_nl_family, NLM_F_MULTI, + SMC_NETLINK_GET_FBACK_STATS); + if (!nlh) + goto errmsg; + attrs = nla_nest_start(skb, SMC_GEN_FBACK_STATS); + if (!attrs) + goto errout; + if (nla_put_u8(skb, SMC_NLA_FBACK_STATS_TYPE, is_srv)) + goto errattr; + if (!cnt_reported) { + if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_SRV_CNT, + net->smc.fback_rsn->srv_fback_cnt, + SMC_NLA_FBACK_STATS_PAD)) + goto errattr; + if (nla_put_u64_64bit(skb, SMC_NLA_FBACK_STATS_CLNT_CNT, + net->smc.fback_rsn->clnt_fback_cnt, + SMC_NLA_FBACK_STATS_PAD)) + goto errattr; + cnt_reported = 1; + } + + if (nla_put_u32(skb, SMC_NLA_FBACK_STATS_RSN_CODE, + trgt_arr[pos].fback_code)) + goto errattr; + if (nla_put_u16(skb, SMC_NLA_FBACK_STATS_RSN_CNT, + trgt_arr[pos].count)) + goto errattr; + + cb_ctx->pos[2] = cnt_reported; + nla_nest_end(skb, attrs); + genlmsg_end(skb, nlh); + return rc; + +errattr: + nla_nest_cancel(skb, attrs); +errout: + genlmsg_cancel(skb, nlh); +errmsg: + return -EMSGSIZE; +} + +int smc_nl_get_fback_stats(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); + struct net *net = sock_net(skb->sk); + int rc_srv = 0, rc_clnt = 0, k; + int skip_serv = cb_ctx->pos[1]; + int snum = cb_ctx->pos[0]; + bool is_srv = true; + + mutex_lock(&net->smc.mutex_fback_rsn); + for (k = 0; k < SMC_MAX_FBACK_RSN_CNT; k++) { + if (k < snum) + continue; + if (!skip_serv) { + rc_srv = smc_nl_get_fback_details(skb, cb, k, is_srv); + if (rc_srv && rc_srv != -ENODATA) + break; + } else { + skip_serv = 0; + } + rc_clnt = smc_nl_get_fback_details(skb, cb, k, !is_srv); + if (rc_clnt && rc_clnt != -ENODATA) { + skip_serv = 1; + break; + } + if (rc_clnt == -ENODATA && rc_srv == -ENODATA) + break; + } + mutex_unlock(&net->smc.mutex_fback_rsn); + cb_ctx->pos[1] = skip_serv; + cb_ctx->pos[0] = k; + return skb->len; +} -- cgit v1.3.1