Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1 | /* |
| 2 | * net/core/netprio_cgroup.c Priority Control Group |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Neil Horman <nhorman@tuxdriver.com> |
| 10 | */ |
| 11 | |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/cgroup.h> |
| 21 | #include <linux/rcupdate.h> |
| 22 | #include <linux/atomic.h> |
| 23 | #include <net/rtnetlink.h> |
| 24 | #include <net/pkt_cls.h> |
| 25 | #include <net/sock.h> |
| 26 | #include <net/netprio_cgroup.h> |
| 27 | |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 28 | #include <linux/fdtable.h> |
| 29 | |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 30 | #define PRIOMAP_MIN_SZ 128 |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 31 | |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 32 | /* |
stephen hemminger | 8e3bff9 | 2013-12-08 12:15:44 -0800 | [diff] [blame] | 33 | * Extend @dev->priomap so that it's large enough to accommodate |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 34 | * @target_idx. @dev->priomap.priomap_len > @target_idx after successful |
| 35 | * return. Must be called under rtnl lock. |
| 36 | */ |
| 37 | static int extend_netdev_table(struct net_device *dev, u32 target_idx) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 38 | { |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 39 | struct netprio_map *old, *new; |
| 40 | size_t new_sz, new_len; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 41 | |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 42 | /* is the existing priomap large enough? */ |
Tejun Heo | 52bca93 | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 43 | old = rtnl_dereference(dev->priomap); |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 44 | if (old && old->priomap_len > target_idx) |
| 45 | return 0; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 46 | |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 47 | /* |
| 48 | * Determine the new size. Let's keep it power-of-two. We start |
| 49 | * from PRIOMAP_MIN_SZ and double it until it's large enough to |
| 50 | * accommodate @target_idx. |
| 51 | */ |
| 52 | new_sz = PRIOMAP_MIN_SZ; |
| 53 | while (true) { |
| 54 | new_len = (new_sz - offsetof(struct netprio_map, priomap)) / |
| 55 | sizeof(new->priomap[0]); |
| 56 | if (new_len > target_idx) |
| 57 | break; |
| 58 | new_sz *= 2; |
| 59 | /* overflowed? */ |
| 60 | if (WARN_ON(new_sz < PRIOMAP_MIN_SZ)) |
| 61 | return -ENOSPC; |
| 62 | } |
| 63 | |
| 64 | /* allocate & copy */ |
| 65 | new = kzalloc(new_sz, GFP_KERNEL); |
Joe Perches | 62b5942 | 2013-02-04 16:48:16 +0000 | [diff] [blame] | 66 | if (!new) |
Gao feng | ef209f1 | 2012-07-11 21:50:15 +0000 | [diff] [blame] | 67 | return -ENOMEM; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 68 | |
Tejun Heo | 52bca93 | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 69 | if (old) |
| 70 | memcpy(new->priomap, old->priomap, |
| 71 | old->priomap_len * sizeof(old->priomap[0])); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 72 | |
Tejun Heo | 52bca93 | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 73 | new->priomap_len = new_len; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 74 | |
Tejun Heo | 4a6ee25c | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 75 | /* install the new priomap */ |
Tejun Heo | 52bca93 | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 76 | rcu_assign_pointer(dev->priomap, new); |
| 77 | if (old) |
| 78 | kfree_rcu(old, rcu); |
Gao feng | ef209f1 | 2012-07-11 21:50:15 +0000 | [diff] [blame] | 79 | return 0; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 80 | } |
| 81 | |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 82 | /** |
| 83 | * netprio_prio - return the effective netprio of a cgroup-net_device pair |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 84 | * @css: css part of the target pair |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 85 | * @dev: net_device part of the target pair |
| 86 | * |
| 87 | * Should be called under RCU read or rtnl lock. |
| 88 | */ |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 89 | static u32 netprio_prio(struct cgroup_subsys_state *css, struct net_device *dev) |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 90 | { |
| 91 | struct netprio_map *map = rcu_dereference_rtnl(dev->priomap); |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 92 | int id = css->cgroup->id; |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 93 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 94 | if (map && id < map->priomap_len) |
| 95 | return map->priomap[id]; |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * netprio_set_prio - set netprio on a cgroup-net_device pair |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 101 | * @css: css part of the target pair |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 102 | * @dev: net_device part of the target pair |
| 103 | * @prio: prio to set |
| 104 | * |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 105 | * Set netprio to @prio on @css-@dev pair. Should be called under rtnl |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 106 | * lock and may fail under memory pressure for non-zero @prio. |
| 107 | */ |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 108 | static int netprio_set_prio(struct cgroup_subsys_state *css, |
| 109 | struct net_device *dev, u32 prio) |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 110 | { |
| 111 | struct netprio_map *map; |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 112 | int id = css->cgroup->id; |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 113 | int ret; |
| 114 | |
| 115 | /* avoid extending priomap for zero writes */ |
| 116 | map = rtnl_dereference(dev->priomap); |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 117 | if (!prio && (!map || map->priomap_len <= id)) |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 118 | return 0; |
| 119 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 120 | ret = extend_netdev_table(dev, id); |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 121 | if (ret) |
| 122 | return ret; |
| 123 | |
| 124 | map = rtnl_dereference(dev->priomap); |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 125 | map->priomap[id] = prio; |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 129 | static struct cgroup_subsys_state * |
| 130 | cgrp_css_alloc(struct cgroup_subsys_state *parent_css) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 131 | { |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 132 | struct cgroup_subsys_state *css; |
Tejun Heo | 88d642f | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 133 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 134 | css = kzalloc(sizeof(*css), GFP_KERNEL); |
| 135 | if (!css) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 136 | return ERR_PTR(-ENOMEM); |
| 137 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 138 | return css; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 139 | } |
| 140 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 141 | static int cgrp_css_online(struct cgroup_subsys_state *css) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 142 | { |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 143 | struct cgroup_subsys_state *parent_css = css_parent(css); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 144 | struct net_device *dev; |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 145 | int ret = 0; |
| 146 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 147 | if (!parent_css) |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 148 | return 0; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 149 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 150 | rtnl_lock(); |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 151 | /* |
| 152 | * Inherit prios from the parent. As all prios are set during |
| 153 | * onlining, there is no need to clear them on offline. |
| 154 | */ |
| 155 | for_each_netdev(&init_net, dev) { |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 156 | u32 prio = netprio_prio(parent_css, dev); |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 157 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 158 | ret = netprio_set_prio(css, dev, prio); |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 159 | if (ret) |
| 160 | break; |
| 161 | } |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 162 | rtnl_unlock(); |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 163 | return ret; |
| 164 | } |
| 165 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 166 | static void cgrp_css_free(struct cgroup_subsys_state *css) |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 167 | { |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 168 | kfree(css); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 169 | } |
| 170 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 171 | static u64 read_prioidx(struct cgroup_subsys_state *css, struct cftype *cft) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 172 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 173 | return css->cgroup->id; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 174 | } |
| 175 | |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 176 | static int read_priomap(struct seq_file *sf, void *v) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 177 | { |
| 178 | struct net_device *dev; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 179 | |
| 180 | rcu_read_lock(); |
Tejun Heo | 666b0eb | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 181 | for_each_netdev_rcu(&init_net, dev) |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 182 | seq_printf(sf, "%s %u\n", dev->name, |
| 183 | netprio_prio(seq_css(sf), dev)); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 184 | rcu_read_unlock(); |
| 185 | return 0; |
| 186 | } |
| 187 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 188 | static int write_priomap(struct cgroup_subsys_state *css, struct cftype *cft, |
Tejun Heo | 4d3bb51 | 2014-03-19 10:23:54 -0400 | [diff] [blame] | 189 | char *buffer) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 190 | { |
Tejun Heo | 6d5759d | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 191 | char devname[IFNAMSIZ + 1]; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 192 | struct net_device *dev; |
Tejun Heo | 6d5759d | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 193 | u32 prio; |
| 194 | int ret; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 195 | |
Tejun Heo | 6d5759d | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 196 | if (sscanf(buffer, "%"__stringify(IFNAMSIZ)"s %u", devname, &prio) != 2) |
| 197 | return -EINVAL; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 198 | |
| 199 | dev = dev_get_by_name(&init_net, devname); |
| 200 | if (!dev) |
Tejun Heo | 6d5759d | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 201 | return -ENODEV; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 202 | |
John Fastabend | 476ad15 | 2012-08-14 12:34:35 +0000 | [diff] [blame] | 203 | rtnl_lock(); |
Tejun Heo | 6d5759d | 2012-11-22 07:32:46 -0800 | [diff] [blame] | 204 | |
Tejun Heo | 6d37b97 | 2013-08-08 20:11:22 -0400 | [diff] [blame] | 205 | ret = netprio_set_prio(css, dev, prio); |
Gao feng | ef209f1 | 2012-07-11 21:50:15 +0000 | [diff] [blame] | 206 | |
John Fastabend | 476ad15 | 2012-08-14 12:34:35 +0000 | [diff] [blame] | 207 | rtnl_unlock(); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 208 | dev_put(dev); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 209 | return ret; |
| 210 | } |
| 211 | |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 212 | static int update_netprio(const void *v, struct file *file, unsigned n) |
| 213 | { |
| 214 | int err; |
| 215 | struct socket *sock = sock_from_file(file, &err); |
| 216 | if (sock) |
| 217 | sock->sk->sk_cgrp_prioidx = (u32)(unsigned long)v; |
| 218 | return 0; |
| 219 | } |
| 220 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 221 | static void net_prio_attach(struct cgroup_subsys_state *css, |
| 222 | struct cgroup_taskset *tset) |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 223 | { |
| 224 | struct task_struct *p; |
Gao feng | e1af5e4 | 2013-10-08 11:05:19 +0800 | [diff] [blame] | 225 | void *v = (void *)(unsigned long)css->cgroup->id; |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 226 | |
Tejun Heo | 924f0d9a | 2014-02-13 06:58:41 -0500 | [diff] [blame] | 227 | cgroup_taskset_for_each(p, tset) { |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 228 | task_lock(p); |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 229 | iterate_fd(p->files, 0, update_netprio, v); |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 230 | task_unlock(p); |
| 231 | } |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 232 | } |
| 233 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 234 | static struct cftype ss_files[] = { |
| 235 | { |
| 236 | .name = "prioidx", |
| 237 | .read_u64 = read_prioidx, |
| 238 | }, |
| 239 | { |
| 240 | .name = "ifpriomap", |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 241 | .seq_show = read_priomap, |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 242 | .write_string = write_priomap, |
| 243 | }, |
Tejun Heo | 4baf6e3 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 244 | { } /* terminate */ |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 245 | }; |
| 246 | |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 247 | struct cgroup_subsys net_prio_cgrp_subsys = { |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 248 | .css_alloc = cgrp_css_alloc, |
Tejun Heo | 811d8d6 | 2012-11-22 07:32:47 -0800 | [diff] [blame] | 249 | .css_online = cgrp_css_online, |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 250 | .css_free = cgrp_css_free, |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 251 | .attach = net_prio_attach, |
Tejun Heo | 4baf6e3 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 252 | .base_cftypes = ss_files, |
Tejun Heo | 676f7c8 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 253 | }; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 254 | |
| 255 | static int netprio_device_event(struct notifier_block *unused, |
| 256 | unsigned long event, void *ptr) |
| 257 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 258 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 259 | struct netprio_map *old; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 260 | |
| 261 | /* |
| 262 | * Note this is called with rtnl_lock held so we have update side |
| 263 | * protection on our rcu assignments |
| 264 | */ |
| 265 | |
| 266 | switch (event) { |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 267 | case NETDEV_UNREGISTER: |
| 268 | old = rtnl_dereference(dev->priomap); |
Eric Dumazet | 2cfa5a0 | 2011-11-23 07:09:32 +0000 | [diff] [blame] | 269 | RCU_INIT_POINTER(dev->priomap, NULL); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 270 | if (old) |
| 271 | kfree_rcu(old, rcu); |
| 272 | break; |
| 273 | } |
| 274 | return NOTIFY_DONE; |
| 275 | } |
| 276 | |
| 277 | static struct notifier_block netprio_device_notifier = { |
| 278 | .notifier_call = netprio_device_event |
| 279 | }; |
| 280 | |
| 281 | static int __init init_cgroup_netprio(void) |
| 282 | { |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 283 | register_netdevice_notifier(&netprio_device_notifier); |
Tejun Heo | af63633 | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 284 | return 0; |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 285 | } |
| 286 | |
Tejun Heo | af63633 | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 287 | subsys_initcall(init_cgroup_netprio); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 288 | MODULE_LICENSE("GPL v2"); |