diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/610-v5.15-58-netfilter-flowtable-avoid-possible-false-sharing.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/610-v5.15-58-netfilter-flowtable-avoid-possible-false-sharing.patch | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/610-v5.15-58-netfilter-flowtable-avoid-possible-false-sharing.patch b/target/linux/generic/backport-5.10/610-v5.15-58-netfilter-flowtable-avoid-possible-false-sharing.patch new file mode 100644 index 0000000000..69c06c51d8 --- /dev/null +++ b/target/linux/generic/backport-5.10/610-v5.15-58-netfilter-flowtable-avoid-possible-false-sharing.patch @@ -0,0 +1,27 @@ +From: Pablo Neira Ayuso <pablo@netfilter.org> +Date: Sat, 17 Jul 2021 10:10:29 +0200 +Subject: [PATCH] netfilter: flowtable: avoid possible false sharing + +The flowtable follows the same timeout approach as conntrack, use the +same idiom as in cc16921351d8 ("netfilter: conntrack: avoid same-timeout +update") but also include the fix provided by e37542ba111f ("netfilter: +conntrack: avoid possible false sharing"). + +Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> +--- + +--- a/net/netfilter/nf_flow_table_core.c ++++ b/net/netfilter/nf_flow_table_core.c +@@ -328,7 +328,11 @@ EXPORT_SYMBOL_GPL(flow_offload_add); + void flow_offload_refresh(struct nf_flowtable *flow_table, + struct flow_offload *flow) + { +- flow->timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow); ++ u32 timeout; ++ ++ timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow); ++ if (READ_ONCE(flow->timeout) != timeout) ++ WRITE_ONCE(flow->timeout, timeout); + + if (likely(!nf_flowtable_hw_offload(flow_table))) + return; |