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linux/net/8021q/vlanproc.c
Alexander Lobakin beb5a9bea8 netdevice: convert private flags > BIT(31) to bitfields 
Make dev->priv_flags `u32` back and define bits higher than 31 as
bitfield booleans as per Jakub's suggestion. This simplifies code
which accesses these bits with no optimization loss (testb both
before/after), allows to not extend &netdev_priv_flags each time,
but also scales better as bits > 63 in the future would only add
a new u64 to the structure with no complications, comparing to
that extending ::priv_flags would require converting it to a bitmap.
Note that I picked `unsigned long :1` to not lose any potential
optimizations comparing to `bool :1` etc.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-09-03 11:36:43 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
* vlanproc.c VLAN Module. /proc filesystem interface.
*
* This module is completely hardware-independent and provides
* access to the router using Linux /proc filesystem.
*
* Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c
* by: Gene Kozin <genek@compuserve.com>
*
* Copyright: (c) 1998 Ben Greear
*
* ============================================================================
* Jan 20, 1998 Ben Greear Initial Version
*****************************************************************************/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "vlanproc.h"
#include "vlan.h"
/****** Function Prototypes *************************************************/
/* Methods for preparing data for reading proc entries */
static int vlan_seq_show(struct seq_file *seq, void *v);
static void *vlan_seq_start(struct seq_file *seq, loff_t *pos);
static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos);
static void vlan_seq_stop(struct seq_file *seq, void *);
static int vlandev_seq_show(struct seq_file *seq, void *v);
/*
* Global Data
*/
/*
* Names of the proc directory entries
*/
static const char name_root[] = "vlan";
static const char name_conf[] = "config";
/*
* Structures for interfacing with the /proc filesystem.
* VLAN creates its own directory /proc/net/vlan with the following
* entries:
* config device status/configuration
* <device> entry for each device
*/
/*
* Generic /proc/net/vlan/<file> file and inode operations
*/
static const struct seq_operations vlan_seq_ops = {
.start = vlan_seq_start,
.next = vlan_seq_next,
.stop = vlan_seq_stop,
.show = vlan_seq_show,
};
/*
* Proc filesystem directory entries.
*/
/* Strings */
static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
[VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID",
[VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
[VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
[VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID",
};
/*
* Interface functions
*/
/*
* Clean up /proc/net/vlan entries
*/
void vlan_proc_cleanup(struct net *net)
{
struct vlan_net *vn = net_generic(net, vlan_net_id);
if (vn->proc_vlan_conf)
remove_proc_entry(name_conf, vn->proc_vlan_dir);
if (vn->proc_vlan_dir)
remove_proc_entry(name_root, net->proc_net);
/* Dynamically added entries should be cleaned up as their vlan_device
* is removed, so we should not have to take care of it here...
*/
}
/*
* Create /proc/net/vlan entries
*/
int __net_init vlan_proc_init(struct net *net)
{
struct vlan_net *vn = net_generic(net, vlan_net_id);
vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
if (!vn->proc_vlan_dir)
goto err;
vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600,
vn->proc_vlan_dir, &vlan_seq_ops,
sizeof(struct seq_net_private));
if (!vn->proc_vlan_conf)
goto err;
return 0;
err:
pr_err("can't create entry in proc filesystem!\n");
vlan_proc_cleanup(net);
return -ENOBUFS;
}
/*
* Add directory entry for VLAN device.
*/
int vlan_proc_add_dev(struct net_device *vlandev)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
if (!strcmp(vlandev->name, name_conf))
return -EINVAL;
vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600,
vn->proc_vlan_dir, vlandev_seq_show, vlandev);
if (!vlan->dent)
return -ENOBUFS;
return 0;
}
/*
* Delete directory entry for VLAN device.
*/
void vlan_proc_rem_dev(struct net_device *vlandev)
{
/** NOTE: This will consume the memory pointed to by dent, it seems. */
proc_remove(vlan_dev_priv(vlandev)->dent);
vlan_dev_priv(vlandev)->dent = NULL;
}
/****** Proc filesystem entry points ****************************************/
/*
* The following few functions build the content of /proc/net/vlan/config
*/
static void *vlan_seq_from_index(struct seq_file *seq, loff_t *pos)
{
unsigned long ifindex = *pos;
struct net_device *dev;
for_each_netdev_dump(seq_file_net(seq), dev, ifindex) {
if (!is_vlan_dev(dev))
continue;
*pos = dev->ifindex;
return dev;
}
return NULL;
}
static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(rcu)
{
rcu_read_lock();
if (*pos == 0)
return SEQ_START_TOKEN;
return vlan_seq_from_index(seq, pos);
}
static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
++*pos;
return vlan_seq_from_index(seq, pos);
}
static void vlan_seq_stop(struct seq_file *seq, void *v)
__releases(rcu)
{
rcu_read_unlock();
}
static int vlan_seq_show(struct seq_file *seq, void *v)
{
struct net *net = seq_file_net(seq);
struct vlan_net *vn = net_generic(net, vlan_net_id);
if (v == SEQ_START_TOKEN) {
const char *nmtype = NULL;
seq_puts(seq, "VLAN Dev name | VLAN ID\n");
if (vn->name_type < ARRAY_SIZE(vlan_name_type_str))
nmtype = vlan_name_type_str[vn->name_type];
seq_printf(seq, "Name-Type: %s\n",
nmtype ? nmtype : "UNKNOWN");
} else {
const struct net_device *vlandev = v;
const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
seq_printf(seq, "%-15s| %d | %s\n", vlandev->name,
vlan->vlan_id, vlan->real_dev->name);
}
return 0;
}
static int vlandev_seq_show(struct seq_file *seq, void *offset)
{
struct net_device *vlandev = (struct net_device *) seq->private;
const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
static const char fmt64[] = "%30s %12llu\n";
int i;
if (!is_vlan_dev(vlandev))
return 0;
stats = dev_get_stats(vlandev, &temp);
seq_printf(seq,
"%s VID: %d REORDER_HDR: %i dev->priv_flags: %x\n",
vlandev->name, vlan->vlan_id,
(int)(vlan->flags & 1), (u32)vlandev->priv_flags);
seq_printf(seq, fmt64, "total frames received", stats->rx_packets);
seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes);
seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast);
seq_puts(seq, "\n");
seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets);
seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes);
seq_printf(seq, "Device: %s", vlan->real_dev->name);
/* now show all PRIORITY mappings relating to this VLAN */
seq_printf(seq, "\nINGRESS priority mappings: "
"0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n",
vlan->ingress_priority_map[0],
vlan->ingress_priority_map[1],
vlan->ingress_priority_map[2],
vlan->ingress_priority_map[3],
vlan->ingress_priority_map[4],
vlan->ingress_priority_map[5],
vlan->ingress_priority_map[6],
vlan->ingress_priority_map[7]);
seq_printf(seq, " EGRESS priority mappings: ");
for (i = 0; i < 16; i++) {
const struct vlan_priority_tci_mapping *mp
= vlan->egress_priority_map[i];
while (mp) {
seq_printf(seq, "%u:%d ",
mp->priority, ((mp->vlan_qos >> 13) & 0x7));
mp = mp->next;
}
}
seq_puts(seq, "\n");
return 0;
}
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