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![Jason Xing](/assets/img/avatar_default.png)
Sometimes we need to know which one of backlog queue can be exactly long enough to cause some latency when debugging this part is needed. Thus, we can then separate the display of both. Signed-off-by: Jason Xing <kernelxing@tencent.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/20230321015746.96994-1-kerneljasonxing@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
415 lines
9.5 KiB
C
415 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/netdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/wext.h>
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#include "dev.h"
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#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
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#define get_bucket(x) ((x) >> BUCKET_SPACE)
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#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
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#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
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static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
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{
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struct net *net = seq_file_net(seq);
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struct net_device *dev;
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struct hlist_head *h;
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unsigned int count = 0, offset = get_offset(*pos);
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h = &net->dev_index_head[get_bucket(*pos)];
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hlist_for_each_entry_rcu(dev, h, index_hlist) {
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if (++count == offset)
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return dev;
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}
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return NULL;
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}
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static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
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{
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struct net_device *dev;
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unsigned int bucket;
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do {
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dev = dev_from_same_bucket(seq, pos);
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if (dev)
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return dev;
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bucket = get_bucket(*pos) + 1;
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*pos = set_bucket_offset(bucket, 1);
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} while (bucket < NETDEV_HASHENTRIES);
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return NULL;
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}
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/*
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* This is invoked by the /proc filesystem handler to display a device
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* in detail.
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*/
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static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(RCU)
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{
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rcu_read_lock();
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if (!*pos)
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return SEQ_START_TOKEN;
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if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
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return NULL;
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return dev_from_bucket(seq, pos);
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}
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static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return dev_from_bucket(seq, pos);
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}
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static void dev_seq_stop(struct seq_file *seq, void *v)
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__releases(RCU)
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{
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rcu_read_unlock();
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}
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static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
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{
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struct rtnl_link_stats64 temp;
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const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
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seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
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"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
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dev->name, stats->rx_bytes, stats->rx_packets,
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stats->rx_errors,
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stats->rx_dropped + stats->rx_missed_errors,
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stats->rx_fifo_errors,
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stats->rx_length_errors + stats->rx_over_errors +
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stats->rx_crc_errors + stats->rx_frame_errors,
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stats->rx_compressed, stats->multicast,
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stats->tx_bytes, stats->tx_packets,
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stats->tx_errors, stats->tx_dropped,
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stats->tx_fifo_errors, stats->collisions,
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stats->tx_carrier_errors +
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stats->tx_aborted_errors +
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stats->tx_window_errors +
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stats->tx_heartbeat_errors,
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stats->tx_compressed);
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}
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/*
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* Called from the PROCfs module. This now uses the new arbitrary sized
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* /proc/net interface to create /proc/net/dev
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*/
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static int dev_seq_show(struct seq_file *seq, void *v)
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{
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "Inter-| Receive "
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" | Transmit\n"
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" face |bytes packets errs drop fifo frame "
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"compressed multicast|bytes packets errs "
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"drop fifo colls carrier compressed\n");
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else
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dev_seq_printf_stats(seq, v);
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return 0;
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}
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static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
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{
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return skb_queue_len_lockless(&sd->input_pkt_queue);
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}
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static u32 softnet_process_queue_len(struct softnet_data *sd)
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{
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return skb_queue_len_lockless(&sd->process_queue);
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}
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static struct softnet_data *softnet_get_online(loff_t *pos)
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{
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struct softnet_data *sd = NULL;
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while (*pos < nr_cpu_ids)
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if (cpu_online(*pos)) {
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sd = &per_cpu(softnet_data, *pos);
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break;
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} else
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++*pos;
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return sd;
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}
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static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return softnet_get_online(pos);
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}
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static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return softnet_get_online(pos);
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}
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static void softnet_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static int softnet_seq_show(struct seq_file *seq, void *v)
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{
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struct softnet_data *sd = v;
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u32 input_qlen = softnet_input_pkt_queue_len(sd);
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u32 process_qlen = softnet_process_queue_len(sd);
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unsigned int flow_limit_count = 0;
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#ifdef CONFIG_NET_FLOW_LIMIT
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struct sd_flow_limit *fl;
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rcu_read_lock();
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fl = rcu_dereference(sd->flow_limit);
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if (fl)
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flow_limit_count = fl->count;
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rcu_read_unlock();
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#endif
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/* the index is the CPU id owing this sd. Since offline CPUs are not
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* displayed, it would be othrwise not trivial for the user-space
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* mapping the data a specific CPU
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*/
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seq_printf(seq,
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"%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
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"%08x %08x\n",
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sd->processed, sd->dropped, sd->time_squeeze, 0,
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0, 0, 0, 0, /* was fastroute */
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0, /* was cpu_collision */
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sd->received_rps, flow_limit_count,
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input_qlen + process_qlen, (int)seq->index,
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input_qlen, process_qlen);
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return 0;
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}
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static const struct seq_operations dev_seq_ops = {
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.start = dev_seq_start,
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.next = dev_seq_next,
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.stop = dev_seq_stop,
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.show = dev_seq_show,
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};
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static const struct seq_operations softnet_seq_ops = {
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.start = softnet_seq_start,
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.next = softnet_seq_next,
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.stop = softnet_seq_stop,
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.show = softnet_seq_show,
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};
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static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct list_head *ptype_list = NULL;
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struct packet_type *pt = NULL;
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struct net_device *dev;
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loff_t i = 0;
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int t;
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for_each_netdev_rcu(seq_file_net(seq), dev) {
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ptype_list = &dev->ptype_all;
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list_for_each_entry_rcu(pt, ptype_list, list) {
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if (i == pos)
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return pt;
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++i;
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}
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}
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list_for_each_entry_rcu(pt, &ptype_all, list) {
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if (i == pos)
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return pt;
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++i;
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}
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for (t = 0; t < PTYPE_HASH_SIZE; t++) {
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list_for_each_entry_rcu(pt, &ptype_base[t], list) {
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if (i == pos)
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return pt;
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++i;
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}
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}
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return NULL;
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}
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static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(RCU)
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{
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rcu_read_lock();
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return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
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}
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static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct net_device *dev;
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struct packet_type *pt;
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struct list_head *nxt;
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int hash;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return ptype_get_idx(seq, 0);
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pt = v;
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nxt = pt->list.next;
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if (pt->dev) {
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if (nxt != &pt->dev->ptype_all)
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goto found;
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dev = pt->dev;
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for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
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if (!list_empty(&dev->ptype_all)) {
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nxt = dev->ptype_all.next;
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goto found;
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}
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}
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nxt = ptype_all.next;
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goto ptype_all;
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}
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if (pt->type == htons(ETH_P_ALL)) {
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ptype_all:
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if (nxt != &ptype_all)
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goto found;
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hash = 0;
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nxt = ptype_base[0].next;
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} else
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hash = ntohs(pt->type) & PTYPE_HASH_MASK;
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while (nxt == &ptype_base[hash]) {
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if (++hash >= PTYPE_HASH_SIZE)
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return NULL;
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nxt = ptype_base[hash].next;
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}
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found:
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return list_entry(nxt, struct packet_type, list);
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}
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static void ptype_seq_stop(struct seq_file *seq, void *v)
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__releases(RCU)
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{
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rcu_read_unlock();
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}
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static int ptype_seq_show(struct seq_file *seq, void *v)
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{
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struct packet_type *pt = v;
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "Type Device Function\n");
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else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
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(!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
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if (pt->type == htons(ETH_P_ALL))
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seq_puts(seq, "ALL ");
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else
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seq_printf(seq, "%04x", ntohs(pt->type));
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seq_printf(seq, " %-8s %ps\n",
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pt->dev ? pt->dev->name : "", pt->func);
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}
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return 0;
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}
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static const struct seq_operations ptype_seq_ops = {
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.start = ptype_seq_start,
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.next = ptype_seq_next,
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.stop = ptype_seq_stop,
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.show = ptype_seq_show,
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};
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static int __net_init dev_proc_net_init(struct net *net)
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{
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int rc = -ENOMEM;
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if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
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sizeof(struct seq_net_private)))
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goto out;
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if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
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&softnet_seq_ops))
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goto out_dev;
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if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
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sizeof(struct seq_net_private)))
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goto out_softnet;
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if (wext_proc_init(net))
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goto out_ptype;
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rc = 0;
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out:
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return rc;
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out_ptype:
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remove_proc_entry("ptype", net->proc_net);
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out_softnet:
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remove_proc_entry("softnet_stat", net->proc_net);
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out_dev:
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remove_proc_entry("dev", net->proc_net);
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goto out;
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}
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static void __net_exit dev_proc_net_exit(struct net *net)
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{
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wext_proc_exit(net);
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remove_proc_entry("ptype", net->proc_net);
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remove_proc_entry("softnet_stat", net->proc_net);
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remove_proc_entry("dev", net->proc_net);
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}
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static struct pernet_operations __net_initdata dev_proc_ops = {
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.init = dev_proc_net_init,
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.exit = dev_proc_net_exit,
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};
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static int dev_mc_seq_show(struct seq_file *seq, void *v)
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{
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struct netdev_hw_addr *ha;
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struct net_device *dev = v;
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if (v == SEQ_START_TOKEN)
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return 0;
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netif_addr_lock_bh(dev);
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netdev_for_each_mc_addr(ha, dev) {
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seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
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dev->ifindex, dev->name,
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ha->refcount, ha->global_use,
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(int)dev->addr_len, ha->addr);
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}
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netif_addr_unlock_bh(dev);
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return 0;
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}
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static const struct seq_operations dev_mc_seq_ops = {
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.start = dev_seq_start,
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.next = dev_seq_next,
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.stop = dev_seq_stop,
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.show = dev_mc_seq_show,
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};
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static int __net_init dev_mc_net_init(struct net *net)
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{
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if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
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sizeof(struct seq_net_private)))
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return -ENOMEM;
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return 0;
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}
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static void __net_exit dev_mc_net_exit(struct net *net)
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{
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remove_proc_entry("dev_mcast", net->proc_net);
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}
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static struct pernet_operations __net_initdata dev_mc_net_ops = {
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.init = dev_mc_net_init,
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.exit = dev_mc_net_exit,
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};
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int __init dev_proc_init(void)
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{
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int ret = register_pernet_subsys(&dev_proc_ops);
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if (!ret)
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return register_pernet_subsys(&dev_mc_net_ops);
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return ret;
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}
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