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kernel: allow adding devices without hw offload to a hw flowtable

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This allows supporting a mix of devices with or without hw offloading support

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2023-09-01 12:43:09 +02:00
parent 6c3eff9dd8
commit c5b7be8316
2 changed files with 58 additions and 0 deletions
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29
target/linux/generic/pending-5.15/701-netfilter-nf_tables-ignore-EOPNOTSUPP-on-flowtable-d.patch Normal file
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@ -0,0 +1,29 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 31 Aug 2023 21:48:38 +0200
Subject: [PATCH] netfilter: nf_tables: ignore -EOPNOTSUPP on flowtable device
offload setup
On many embedded devices, it is common to configure flowtable offloading for
a mix of different devices, some of which have hardware offload support and
some of which don't.
The current code limits the ability of user space to properly set up such a
configuration by only allowing adding devices with hardware offload support to
a offload-enabled flowtable.
Given that offload-enabled flowtables also imply fallback to pure software
offloading, this limitation makes little sense.
Fix it by not bailing out when the offload setup returns -EOPNOTSUPP
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -7729,7 +7729,7 @@ static int nft_register_flowtable_net_ho
err = flowtable->data.type->setup(&flowtable->data,
hook->ops.dev,
FLOW_BLOCK_BIND);
- if (err < 0)
+ if (err < 0 && err != -EOPNOTSUPP)
goto err_unregister_net_hooks;
err = nf_register_net_hook(net, &hook->ops);

29
target/linux/generic/pending-6.1/701-netfilter-nf_tables-ignore-EOPNOTSUPP-on-flowtable-d.patch Normal file
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@ -0,0 +1,29 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 31 Aug 2023 21:48:38 +0200
Subject: [PATCH] netfilter: nf_tables: ignore -EOPNOTSUPP on flowtable device
offload setup
On many embedded devices, it is common to configure flowtable offloading for
a mix of different devices, some of which have hardware offload support and
some of which don't.
The current code limits the ability of user space to properly set up such a
configuration by only allowing adding devices with hardware offload support to
a offload-enabled flowtable.
Given that offload-enabled flowtables also imply fallback to pure software
offloading, this limitation makes little sense.
Fix it by not bailing out when the offload setup returns -EOPNOTSUPP
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -7886,7 +7886,7 @@ static int nft_register_flowtable_net_ho
err = flowtable->data.type->setup(&flowtable->data,
hook->ops.dev,
FLOW_BLOCK_BIND);
- if (err < 0)
+ if (err < 0 && err != -EOPNOTSUPP)
goto err_unregister_net_hooks;
err = nf_register_net_hook(net, &hook->ops);