target/linux/generic/pending-6.1/701-netfilter-nf_tables-ignore-EOPNOTSUPP-on-flowtable-d.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 31 Aug 2023 21:48:38 +0200
   3 Subject: [PATCH] netfilter: nf_tables: ignore -EOPNOTSUPP on flowtable device
   4  offload setup
   5
   6 On many embedded devices, it is common to configure flowtable offloading for
   7 a mix of different devices, some of which have hardware offload support and
   8 some of which don't.
   9 The current code limits the ability of user space to properly set up such a
  10 configuration by only allowing adding devices with hardware offload support to
  11 a offload-enabled flowtable.
  12 Given that offload-enabled flowtables also imply fallback to pure software
  13 offloading, this limitation makes little sense.
  14 Fix it by not bailing out when the offload setup returns -EOPNOTSUPP
  15
  16 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  17 ---
  18
  19 --- a/net/netfilter/nf_tables_api.c
  20 +++ b/net/netfilter/nf_tables_api.c
  21 @@ -7884,7 +7884,7 @@ static int nft_register_flowtable_net_ho
  22                 err = flowtable->data.type->setup(&flowtable->data,
  23                                                   hook->ops.dev,
  24                                                   FLOW_BLOCK_BIND);
  25 -               if (err < 0)
  26 +               if (err < 0 && err != -EOPNOTSUPP)
  27                         goto err_unregister_net_hooks;
  28
  29                 err = nf_register_net_hook(net, &hook->ops);