netdev - Re: [patch net-next] net: sched: move block device tracking into tcf_block_get/put

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Date: Wed, 10 Jan 2024 15:08:41 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Ido Schimmel <idosch@...sch.org>
Cc: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, jhs@...atatu.com,
	xiyou.wangcong@...il.com, victor@...atatu.com,
	pctammela@...atatu.com, mleitner@...hat.com, vladbu@...dia.com,
	paulb@...dia.com
Subject: Re: [patch net-next] net: sched: move block device tracking into
 tcf_block_get/put_ext()

Wed, Jan 10, 2024 at 01:09:55PM CET, idosch@...sch.org wrote:
>On Thu, Jan 04, 2024 at 01:58:44PM +0100, Jiri Pirko wrote:
>> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
>> index adf5de1ff773..253b26f2eddd 100644
>> --- a/net/sched/cls_api.c
>> +++ b/net/sched/cls_api.c
>> @@ -1428,6 +1428,7 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
>>  		      struct tcf_block_ext_info *ei,
>>  		      struct netlink_ext_ack *extack)
>>  {
>> +	struct net_device *dev = qdisc_dev(q);
>>  	struct net *net = qdisc_net(q);
>>  	struct tcf_block *block = NULL;
>>  	int err;
>> @@ -1461,9 +1462,18 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
>>  	if (err)
>>  		goto err_block_offload_bind;
>>  
>> +	if (tcf_block_shared(block)) {
>> +		err = xa_insert(&block->ports, dev->ifindex, dev, GFP_KERNEL);
>> +		if (err) {
>> +			NL_SET_ERR_MSG(extack, "block dev insert failed");
>> +			goto err_dev_insert;
>> +		}
>> +	}
>
>While this patch fixes the original issue, it creates another one:
>
># ip link add name swp1 type dummy
># tc qdisc replace dev swp1 root handle 10: prio bands 8 priomap 7 6 5 4 3 2 1
># tc qdisc add dev swp1 parent 10:8 handle 108: red limit 1000000 min 200000 max 200001 probability 1.0 avpkt 8000 burst 38 qevent early_drop block 10
>RED: set bandwidth to 10Mbit
># tc qdisc add dev swp1 parent 10:7 handle 107: red limit 1000000 min 500000 max 500001 probability 1.0 avpkt 8000 burst 63 qevent early_drop block 10
>RED: set bandwidth to 10Mbit
>Error: block dev insert failed.
>
>The reproducer does not fail if I revert this patch and apply Victor's
>[1] instead.
>
>[1] https://lore.kernel.org/netdev/20231231172320.245375-1-victor@mojatatu.com/

Will fix. Thanks!

>
>> +
>>  	*p_block = block;
>>  	return 0;
>>  
>> +err_dev_insert:
>>  err_block_offload_bind:
>>  	tcf_chain0_head_change_cb_del(block, ei);
>>  err_chain0_head_change_cb_add: