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SubjectRe: [PATCH net-next 2/3] net: sched: cls_api: add filter counter
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Hi Jiri,

Thanks for the review.

On 2/15/24 17:25, Jiri Pirko wrote:
> Thu, Feb 15, 2024 at 05:04:43PM CET, ast@fiberby.net wrote:
>> 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>
>> ---
>> include/net/sch_generic.h | 2 ++
>> net/sched/cls_api.c | 20 ++++++++++++++++++++
>> 2 files changed, 22 insertions(+)
>>
>> diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
>> index 46a63d1818a0..7af0621db226 100644
>> --- a/include/net/sch_generic.h
>> +++ b/include/net/sch_generic.h
>> @@ -427,6 +427,7 @@ struct tcf_proto {
>> */
>> spinlock_t lock;
>> bool deleting;
>> + bool counted;
>> refcount_t refcnt;
>> struct rcu_head rcu;
>> struct hlist_node destroy_ht_node;
>> @@ -476,6 +477,7 @@ 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 */
>> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
>> index 397c3d29659c..c750cb662142 100644
>> --- a/net/sched/cls_api.c
>> +++ b/net/sched/cls_api.c
>> @@ -411,11 +411,13 @@ static void tcf_proto_get(struct tcf_proto *tp)
>> }
>>
>> static void tcf_chain_put(struct tcf_chain *chain);
>> +static void tcf_block_filter_cnt_update(struct tcf_block *block, bool *counted, bool add);
>>
>> 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 +2366,7 @@ 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);
>> @@ -3478,6 +3481,23 @@ int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
>> }
>> EXPORT_SYMBOL(tcf_exts_dump_stats);
>>
>> +static void tcf_block_filter_cnt_update(struct tcf_block *block, bool *counted, bool add)
>
> Can't you move this up to avoid forward declaration?

Sure, will do that in v2.

I had considered it, but in the end decided to keep it next to the related offloadcnt logic.


>> +{
>> + 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_block_offload_inc(struct tcf_block *block, u32 *flags)
>> {
>> if (*flags & TCA_CLS_FLAGS_IN_HW)
>> --
>> 2.43.0
>>

--
Best regards
Asbjørn Sloth Tønnesen
Network Engineer
Fiberby - AS42541

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