diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-02-11 21:44:03 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-02-13 18:34:49 -0800 |
| commit | f383ced24d6ae6c1989394d052d3109b9d645f11 (patch) | |
| tree | 420e4b730cc9b88315e650fdf804c0a81892c2b0 /net/8021q | |
| parent | bed90b06b6812d9c8c848414b090ddf38f0e6cc1 (diff) | |
vlan: use xarray iterator to implement /proc/net/vlan/config
Adopt net->dev_by_index as I did in commit 0e0939c0adf9
("net-procfs: use xarray iterator to implement /proc/net/dev")
Not only this removes quadratic behavior, it also makes sure
an existing vlan device is always visible in the dump,
regardless of concurrent net->dev_base_head changes.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20240211214404.1882191-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/8021q')
| -rw-r--r-- | net/8021q/vlanproc.c | 46 |
1 files changed, 16 insertions, 30 deletions
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c index 7825c129742a..87b959da00cd 100644 --- a/net/8021q/vlanproc.c +++ b/net/8021q/vlanproc.c @@ -163,48 +163,34 @@ void vlan_proc_rem_dev(struct net_device *vlandev) * The following few functions build the content of /proc/net/vlan/config */ -/* start read of /proc/net/vlan/config */ -static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) - __acquires(rcu) +static void *vlan_seq_from_index(struct seq_file *seq, loff_t *pos) { + unsigned long ifindex = *pos; struct net_device *dev; - struct net *net = seq_file_net(seq); - loff_t i = 1; - - rcu_read_lock(); - if (*pos == 0) - return SEQ_START_TOKEN; - for_each_netdev_rcu(net, dev) { + for_each_netdev_dump(seq_file_net(seq), dev, ifindex) { if (!is_vlan_dev(dev)) continue; - - if (i++ == *pos) - return dev; + *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 NULL; + return vlan_seq_from_index(seq, pos); } static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) { - struct net_device *dev; - struct net *net = seq_file_net(seq); - ++*pos; - - dev = v; - if (v == SEQ_START_TOKEN) - dev = net_device_entry(&net->dev_base_head); - - for_each_netdev_continue_rcu(net, dev) { - if (!is_vlan_dev(dev)) - continue; - - return dev; - } - - return NULL; + return vlan_seq_from_index(seq, pos); } static void vlan_seq_stop(struct seq_file *seq, void *v) |