/* * net/sched/act_simple.c Simple example of an action * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: Jamal Hadi Salim (2005-8) * */ #include #include #include #include #include #include #include #include #define TCA_ACT_SIMP 22 #include #include #define SIMP_TAB_MASK 7 static unsigned int simp_net_id; static struct tc_action_ops act_simp_ops; #define SIMP_MAX_DATA 32 static int tcf_simp(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_defact *d = to_defact(a); spin_lock(&d->tcf_lock); tcf_lastuse_update(&d->tcf_tm); bstats_update(&d->tcf_bstats, skb); /* print policy string followed by _ then packet count * Example if this was the 3rd packet and the string was "hello" * then it would look like "hello_3" (without quotes) */ pr_info("simple: %s_%d\n", (char *)d->tcfd_defdata, d->tcf_bstats.packets); spin_unlock(&d->tcf_lock); return d->tcf_action; } static void tcf_simp_release(struct tc_action *a, int bind) { struct tcf_defact *d = to_defact(a); kfree(d->tcfd_defdata); } static int alloc_defdata(struct tcf_defact *d, char *defdata) { d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL); if (unlikely(!d->tcfd_defdata)) return -ENOMEM; strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); return 0; } static void reset_policy(struct tcf_defact *d, char *defdata, struct tc_defact *p) { spin_lock_bh(&d->tcf_lock); d->tcf_action = p->action; memset(d->tcfd_defdata, 0, SIMP_MAX_DATA); strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA); spin_unlock_bh(&d->tcf_lock); } static const struct nla_policy simple_policy[TCA_DEF_MAX + 1] = { [TCA_DEF_PARMS] = { .len = sizeof(struct tc_defact) }, [TCA_DEF_DATA] = { .type = NLA_STRING, .len = SIMP_MAX_DATA }, }; static int tcf_simp_init(struct net *net, struct nlattr *nla, struct nlattr *est, struct tc_action **a, int ovr, int bind) { struct tc_action_net *tn = net_generic(net, simp_net_id); struct nlattr *tb[TCA_DEF_MAX + 1]; struct tc_defact *parm; struct tcf_defact *d; bool exists = false; int ret = 0, err; char *defdata; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_DEF_MAX, nla, simple_policy); if (err < 0) return err; if (tb[TCA_DEF_PARMS] == NULL) return -EINVAL; parm = nla_data(tb[TCA_DEF_PARMS]); exists = tcf_hash_check(tn, parm->index, a, bind); if (exists && bind) return 0; if (tb[TCA_DEF_DATA] == NULL) { if (exists) tcf_hash_release(*a, bind); return -EINVAL; } defdata = nla_data(tb[TCA_DEF_DATA]); if (!exists) { ret = tcf_hash_create(tn, parm->index, est, a, &act_simp_ops, bind, false); if (ret) return ret; d = to_defact(*a); ret = alloc_defdata(d, defdata); if (ret < 0) { tcf_hash_cleanup(*a, est); return ret; } d->tcf_action = parm->action; ret = ACT_P_CREATED; } else { d = to_defact(*a); tcf_hash_release(*a, bind); if (!ovr) return -EEXIST; reset_policy(d, defdata, parm); } if (ret == ACT_P_CREATED) tcf_hash_insert(tn, *a); return ret; } static int tcf_simp_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { unsigned char *b = skb_tail_pointer(skb); struct tcf_defact *d = to_defact(a); struct tc_defact opt = { .index = d->tcf_index, .refcnt = d->tcf_refcnt - ref, .bindcnt = d->tcf_bindcnt - bind, .action = d->tcf_action, }; struct tcf_t t; if (nla_put(skb, TCA_DEF_PARMS, sizeof(opt), &opt) || nla_put_string(skb, TCA_DEF_DATA, d->tcfd_defdata)) goto nla_put_failure; tcf_tm_dump(&t, &d->tcf_tm); if (nla_put_64bit(skb, TCA_DEF_TM, sizeof(t), &t, TCA_DEF_PAD)) goto nla_put_failure; return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; } static int tcf_simp_walker(struct net *net, struct sk_buff *skb, struct netlink_callback *cb, int type, const struct tc_action_ops *ops) { struct tc_action_net *tn = net_generic(net, simp_net_id); return tcf_generic_walker(tn, skb, cb, type, ops); } static int tcf_simp_search(struct net *net, struct tc_action **a, u32 index) { struct tc_action_net *tn = net_generic(net, simp_net_id); return tcf_hash_search(tn, a, index); } static struct tc_action_ops act_simp_ops = { .kind = "simple", .type = TCA_ACT_SIMP, .owner = THIS_MODULE, .act = tcf_simp, .dump = tcf_simp_dump, .cleanup = tcf_simp_release, .init = tcf_simp_init, .walk = tcf_simp_walker, .lookup = tcf_simp_search, .size = sizeof(struct tcf_defact), }; static __net_init int simp_init_net(struct net *net) { struct tc_action_net *tn = net_generic(net, simp_net_id); return tc_action_net_init(tn, &act_simp_ops, SIMP_TAB_MASK); } static void __net_exit simp_exit_net(struct net *net) { struct tc_action_net *tn = net_generic(net, simp_net_id); tc_action_net_exit(tn); } static struct pernet_operations simp_net_ops = { .init = simp_init_net, .exit = simp_exit_net, .id = &simp_net_id, .size = sizeof(struct tc_action_net), }; MODULE_AUTHOR("Jamal Hadi Salim(2005)"); MODULE_DESCRIPTION("Simple example action"); MODULE_LICENSE("GPL"); static int __init simp_init_module(void) { int ret = tcf_register_action(&act_simp_ops, &simp_net_ops); if (!ret) pr_info("Simple TC action Loaded\n"); return ret; } static void __exit simp_cleanup_module(void) { tcf_unregister_action(&act_simp_ops, &simp_net_ops); } module_init(simp_init_module); module_exit(simp_cleanup_module); entation migrates memory whenever any thread of a process is migrated making the behavior somewhat arbitrary. Let's tie memory operations to the threadgroup leader so that memory is migrated only when the leader is migrated. While this is a behavior change, given the inherent fuziness, this change is not too likely to be noticed and allows us to clearly define who owns the memory (always the leader) and helps the planned atomic multi-process migration. Note that we're currently migrating memory in migration path proper while holding all the locks. In the long term, this should be moved out to an async work item. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Zefan Li <lizefan@huawei.com>
Diffstat (limited to 'kernel/cpuset.c')