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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e67f88dd12
Four years ago, Patrick made a change to hold rtnl mutex during netlink dump callbacks. I believe it was a wrong move. This slows down concurrent dumps, making good old /proc/net/ files faster than rtnetlink in some situations. This occurred to me because one "ip link show dev ..." was _very_ slow on a workload adding/removing network devices in background. All dump callbacks are able to use RCU locking now, so this patch does roughly a revert of commits :1c2d670f36: [RTNETLINK]: Hold rtnl_mutex during netlink dump callbacks6313c1e099: [RTNETLINK]: Remove unnecessary locking in dump callbacks This let writers fight for rtnl mutex and readers going full speed. It also takes care of phonet : phonet_route_get() is now called from rcu read section. I renamed it to phonet_route_get_rcu() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Patrick McHardy <kaber@trash.net> Cc: Remi Denis-Courmont <remi.denis-courmont@nokia.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*
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* File: pn_dev.h
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*
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* Phonet network device
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef PN_DEV_H
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#define PN_DEV_H
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struct phonet_device_list {
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struct list_head list;
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struct mutex lock;
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};
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struct phonet_device_list *phonet_device_list(struct net *net);
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struct phonet_device {
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struct list_head list;
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struct net_device *netdev;
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DECLARE_BITMAP(addrs, 64);
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struct rcu_head rcu;
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};
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int phonet_device_init(void);
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void phonet_device_exit(void);
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int phonet_netlink_register(void);
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struct net_device *phonet_device_get(struct net *net);
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int phonet_address_add(struct net_device *dev, u8 addr);
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int phonet_address_del(struct net_device *dev, u8 addr);
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u8 phonet_address_get(struct net_device *dev, u8 addr);
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int phonet_address_lookup(struct net *net, u8 addr);
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void phonet_address_notify(int event, struct net_device *dev, u8 addr);
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int phonet_route_add(struct net_device *dev, u8 daddr);
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int phonet_route_del(struct net_device *dev, u8 daddr);
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void rtm_phonet_notify(int event, struct net_device *dev, u8 dst);
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struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr);
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struct net_device *phonet_route_output(struct net *net, u8 daddr);
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#define PN_NO_ADDR 0xff
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extern const struct file_operations pn_sock_seq_fops;
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extern const struct file_operations pn_res_seq_fops;
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#endif
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