Re: [PATCH net-next 0/9] Netfilter updates for net-net

[Jakub Kicinski <kuba@kernel.org>]

On Mon, 14 Oct 2024 13:14:11 +0200 Pablo Neira Ayuso wrote:
> Hi,
> 
> The following series contains Netfilter updates for net-next:
> 
> 1) Fix sparse warning in nf_tables related to use of percpu counters,
>    from Uros Bizjak.
> 
> 2) use strscpy_pad in nft_meta_bridge, from Justin Stitt.
> 
> 3) A series from patch #3 to patch #7 to reduce memory footprint of set
>    element transactions, Florian Westphal says:
> 
>    When doing a flush on a set or mass adding/removing elements from a
>    set, each element needs to allocate 96 bytes to hold the transactional
>    state.
> 
>    In such cases, virtually all the information in struct nft_trans_elem
>    is the same.
> 
>    Change nft_trans_elem to a flex-array, i.e. a single nft_trans_elem
>    can hold multiple set element pointers.
> 
>    The number of elements that can be stored in one nft_trans_elem is limited
>    by the slab allocator, this series limits the compaction to at most 62
>    elements as it caps the reallocation to 2048 bytes of memory.
> 
> 4) Document legacy toggles for xtables packet classifiers, from
>    Bruno Leitao.
> 
> 5) Use kfree_rcu() instead of call_rcu() + kmem_cache_free(), from Julia Lawall.

Hi! Are you seeing any failures in nft_audit? I haven't looked closely
but it seems that this PR causes: 

<snip>
# testing for cmd: nft reset quotas t1 ... OK
# testing for cmd: nft reset quotas t2 ... OK
# testing for cmd: nft reset quotas ... OK
# testing for cmd: nft delete rule t1 c1 handle 4 ... OK
# testing for cmd: nft delete rule t1 c1 handle 5; delete rule t1 c1 handle 6 ... OK
# testing for cmd: nft flush chain t1 c2 ... OK
# testing for cmd: nft flush table t2 ... OK
# testing for cmd: nft delete chain t2 c2 ... OK
# testing for cmd: nft delete element t1 s { 22 } ... OK
# testing for cmd: nft delete element t1 s { 80, 443 } ... FAIL
# -table=t1 family=2 entries=2 op=nft_unregister_setelem
# +table=t1 family=2 entries=1 op=nft_unregister_setelem
# testing for cmd: nft flush set t1 s2 ... FAIL
# -table=t1 family=2 entries=3 op=nft_unregister_setelem
# +table=t1 family=2 entries=1 op=nft_unregister_setelem
# testing for cmd: nft delete set t1 s2 ... OK
# testing for cmd: nft delete set t1 s3 ... OK
not ok 1 selftests: net/netfilter: nft_audit.sh # exit=251

https://netdev-3.bots.linux.dev/vmksft-nf-dbg/results/815301/10-nft-audit-sh/stdout