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netfilter: nf_tables: asynchronous release 

Release the committed transaction log from a work queue, moving
expensive synchronize_rcu out of the locked section and providing
opportunity to batch this.

On my test machine this cuts runtime of nft-test.py in half.
Based on earlier patch from Pablo Neira Ayuso.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-08-29 14:41:32 +02:00 committed by Pablo Neira Ayuso
parent 0ef235c717
commit 0935d55884
2 changed files with 52 additions and 6 deletions
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2
include/net/netfilter/nf_tables.h
View File

@ -1298,12 +1298,14 @@ static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
*
* @list: used internally
* @msg_type: message type
* @put_net: ctx->net needs to be put
* @ctx: transaction context
* @data: internal information related to the transaction
*/
struct nft_trans {
struct list_head list;
int msg_type;
bool put_net;
struct nft_ctx ctx;
char data[0];
};

56
net/netfilter/nf_tables_api.c
View File

@ -27,6 +27,8 @@
static LIST_HEAD(nf_tables_expressions);
static LIST_HEAD(nf_tables_objects);
static LIST_HEAD(nf_tables_flowtables);
static LIST_HEAD(nf_tables_destroy_list);
static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
static u64 table_handle;
enum {
@ -64,6 +66,8 @@ static void nft_validate_state_update(struct net *net, u8 new_validate_state)
net->nft.validate_state = new_validate_state;
}
static void nf_tables_trans_destroy_work(struct work_struct *w);
static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
static void nft_ctx_init(struct nft_ctx *ctx,
struct net *net,
@ -2453,7 +2457,6 @@ static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
{
struct nft_expr *expr;
lockdep_assert_held(&ctx->net->nft.commit_mutex);
/*
* Careful: some expressions might not be initialized in case this
* is called on error from nf_tables_newrule().
@ -6224,19 +6227,28 @@ static void nft_commit_release(struct nft_trans *trans)
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
break;
}
if (trans->put_net)
put_net(trans->ctx.net);
kfree(trans);
}
static void nf_tables_commit_release(struct net *net)
static void nf_tables_trans_destroy_work(struct work_struct *w)
{
struct nft_trans *trans, *next;
LIST_HEAD(head);
if (list_empty(&net->nft.commit_list))
spin_lock(&nf_tables_destroy_list_lock);
list_splice_init(&nf_tables_destroy_list, &head);
spin_unlock(&nf_tables_destroy_list_lock);
if (list_empty(&head))
return;
synchronize_rcu();
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
list_for_each_entry_safe(trans, next, &head, list) {
list_del(&trans->list);
nft_commit_release(trans);
}
@ -6367,6 +6379,37 @@ static void nft_chain_del(struct nft_chain *chain)
list_del_rcu(&chain->list);
}
static void nf_tables_commit_release(struct net *net)
{
struct nft_trans *trans;
/* all side effects have to be made visible.
* For example, if a chain named 'foo' has been deleted, a
* new transaction must not find it anymore.
*
* Memory reclaim happens asynchronously from work queue
* to prevent expensive synchronize_rcu() in commit phase.
*/
if (list_empty(&net->nft.commit_list)) {
mutex_unlock(&net->nft.commit_mutex);
return;
}
trans = list_last_entry(&net->nft.commit_list,
struct nft_trans, list);
get_net(trans->ctx.net);
WARN_ON_ONCE(trans->put_net);
trans->put_net = true;
spin_lock(&nf_tables_destroy_list_lock);
list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
spin_unlock(&nf_tables_destroy_list_lock);
mutex_unlock(&net->nft.commit_mutex);
schedule_work(&trans_destroy_work);
}
static int nf_tables_commit(struct net *net, struct sk_buff *skb)
{
struct nft_trans *trans, *next;
@ -6528,9 +6571,8 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
}
}
nf_tables_commit_release(net);
nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
mutex_unlock(&net->nft.commit_mutex);
nf_tables_commit_release(net);
return 0;
}
@ -7304,6 +7346,7 @@ static int __init nf_tables_module_init(void)
{
int err;
spin_lock_init(&nf_tables_destroy_list_lock);
err = register_pernet_subsys(&nf_tables_net_ops);
if (err < 0)
return err;
@ -7343,6 +7386,7 @@ static void __exit nf_tables_module_exit(void)
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
nft_chain_filter_fini();
unregister_pernet_subsys(&nf_tables_net_ops);
cancel_work_sync(&trans_destroy_work);
rcu_barrier();
nf_tables_core_module_exit();
}