From ede2762d93ff16e0974f7446516b46b1022db213 Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Fri, 23 Mar 2018 19:47:19 +0300 Subject: net: Make NETDEV_XXX commands enum { } This patch is preparation to drop NETDEV_UNREGISTER_FINAL. Since the cmd is used in usnic_ib_netdev_event_to_string() to get cmd name, after plain removing NETDEV_UNREGISTER_FINAL from everywhere, we'd have holes in event2str[] in this function. Instead of that, let's make NETDEV_XXX commands names available for everyone, and to define netdev_cmd_to_name() in the way we won't have to shaffle names after their numbers are changed. Signed-off-by: Kirill Tkhai Signed-off-by: David S. Miller --- net/core/dev.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'net') diff --git a/net/core/dev.c b/net/core/dev.c index f9c28f44286c..055e7ae12759 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1571,6 +1571,26 @@ static void dev_disable_gro_hw(struct net_device *dev) netdev_WARN(dev, "failed to disable GRO_HW!\n"); } +const char *netdev_cmd_to_name(enum netdev_cmd cmd) +{ +#define N(val) \ + case NETDEV_##val: \ + return "NETDEV_" __stringify(val); + switch (cmd) { + N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) + N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) + N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) + N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) + N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) + N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) + N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) + N(UNREGISTER_FINAL) + }; +#undef N + return "UNKNOWN_NETDEV_EVENT"; +} +EXPORT_SYMBOL_GPL(netdev_cmd_to_name); + static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, struct net_device *dev) { -- cgit v1.2.1 From 070f2d7e264acd6316fc24092b7f51a18c75ac9c Mon Sep 17 00:00:00 2001 From: Kirill Tkhai Date: Fri, 23 Mar 2018 19:47:39 +0300 Subject: net: Drop NETDEV_UNREGISTER_FINAL Last user is gone after bdf5bd7f2132 "rds: tcp: remove register_netdevice_notifier infrastructure.", so we can remove this netdevice command. This allows to delete rtnl_lock() in netdev_run_todo(), which is hot path for net namespace unregistration. dev_change_net_namespace() and netdev_wait_allrefs() have rcu_barrier() before NETDEV_UNREGISTER_FINAL call, and the source commits say they were introduced to delemit the call with NETDEV_UNREGISTER, but this patch leaves them on the places, since they require additional analysis, whether we need in them for something else. Signed-off-by: Kirill Tkhai Signed-off-by: David S. Miller --- net/core/dev.c | 7 ------- 1 file changed, 7 deletions(-) (limited to 'net') diff --git a/net/core/dev.c b/net/core/dev.c index 055e7ae12759..97a96df4b6da 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1584,7 +1584,6 @@ const char *netdev_cmd_to_name(enum netdev_cmd cmd) N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) - N(UNREGISTER_FINAL) }; #undef N return "UNKNOWN_NETDEV_EVENT"; @@ -8097,7 +8096,6 @@ static void netdev_wait_allrefs(struct net_device *dev) rcu_barrier(); rtnl_lock(); - call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); if (test_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state)) { /* We must not have linkwatch events @@ -8169,10 +8167,6 @@ void netdev_run_todo(void) = list_first_entry(&list, struct net_device, todo_list); list_del(&dev->todo_list); - rtnl_lock(); - call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); - __rtnl_unlock(); - if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { pr_err("network todo '%s' but state %d\n", dev->name, dev->reg_state); @@ -8614,7 +8608,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char */ call_netdevice_notifiers(NETDEV_UNREGISTER, dev); rcu_barrier(); - call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); new_nsid = peernet2id_alloc(dev_net(dev), net); /* If there is an ifindex conflict assign a new one */ -- cgit v1.2.1