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net: sched: cls_api: add filter counter

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Maintain a count of filters per block.

Counter updates are protected by cb_lock, which is
also used to protect the offload counters.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Asbjørn Sloth Tønnesen 2024-03-25 20:47:35 +00:00 committed by David S. Miller
parent f631ef39d8
commit 2081fd3445
2 changed files with 21 additions and 0 deletions
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2
include/net/sch_generic.h
View file

@ -422,6 +422,7 @@ struct tcf_proto {
*/
spinlock_t lock;
bool deleting;
bool counted;
refcount_t refcnt;
struct rcu_head rcu;
struct hlist_node destroy_ht_node;
@ -471,6 +472,7 @@ struct tcf_block {
struct flow_block flow_block;
struct list_head owner_list;
bool keep_dst;
atomic_t filtercnt; /* Number of filters */
atomic_t skipswcnt; /* Number of skip_sw filters */
atomic_t offloadcnt; /* Number of oddloaded filters */
unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */

19
net/sched/cls_api.c
View file

@ -410,12 +410,30 @@ static void tcf_proto_get(struct tcf_proto *tp)
refcount_inc(&tp->refcnt);
}
static void tcf_block_filter_cnt_update(struct tcf_block *block, bool *counted, bool add)
{
lockdep_assert_not_held(&block->cb_lock);
down_write(&block->cb_lock);
if (*counted != add) {
if (add) {
atomic_inc(&block->filtercnt);
*counted = true;
} else {
atomic_dec(&block->filtercnt);
*counted = false;
}
}
up_write(&block->cb_lock);
}
static void tcf_chain_put(struct tcf_chain *chain);
static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
bool sig_destroy, struct netlink_ext_ack *extack)
{
tp->ops->destroy(tp, rtnl_held, extack);
tcf_block_filter_cnt_update(tp->chain->block, &tp->counted, false);
if (sig_destroy)
tcf_proto_signal_destroyed(tp->chain, tp);
tcf_chain_put(tp->chain);
@ -2364,6 +2382,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
flags, extack);
if (err == 0) {
tcf_block_filter_cnt_update(block, &tp->counted, true);
tfilter_notify(net, skb, n, tp, block, q, parent, fh,
RTM_NEWTFILTER, false, rtnl_held, extack);
tfilter_put(tp, fh);