Re: [PATCH net] tc: Ensure we have enough buffer space when sending filter netlink notifications

["Toke Høiland-Jørgensen" <toke@redhat.com>]

Paolo Abeni <pabeni@redhat.com> writes:

> On 4/7/25 12:55 PM, Toke Høiland-Jørgensen wrote:
>> To trigger this, run the following commands:
>> 
>>  # ip link add type veth
>>  # tc qdisc replace dev veth0 root handle 1: fq_codel
>>  # tc -echo filter add dev veth0 parent 1: u32 match u32 0 0 $(for i in $(seq 32); do echo action pedit munge ip dport set 22; done)
>> 
>> Before this fix, tc just returns:
>> 
>> Not a filter(cmd 2)
>> 
>> After the fix, we get the correct echo:
>> 
>> added filter dev veth0 parent 1: protocol all pref 49152 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 terminal flowid not_in_hw
>>   match 00000000/00000000 at 0
>> 	action order 1:  pedit action pass keys 1
>>  	index 1 ref 1 bind 1
>> 	key #0  at 20: val 00000016 mask ffff0000
>> [repeated 32 times]
>
> I think it would be great if you could follow-up capturing the above in
> a self-test.

Sure, can do!

-Toke