diff options
Diffstat (limited to 'target/linux/generic/pending-5.10/704-00-netfilter-flowtable-fix-excessive-hw-offload-attempt.patch')
| -rw-r--r-- | target/linux/generic/pending-5.10/704-00-netfilter-flowtable-fix-excessive-hw-offload-attempt.patch | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.10/704-00-netfilter-flowtable-fix-excessive-hw-offload-attempt.patch b/target/linux/generic/pending-5.10/704-00-netfilter-flowtable-fix-excessive-hw-offload-attempt.patch new file mode 100644 index 0000000000..c15f090f71 --- /dev/null +++ b/target/linux/generic/pending-5.10/704-00-netfilter-flowtable-fix-excessive-hw-offload-attempt.patch @@ -0,0 +1,27 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Fri, 6 May 2022 12:37:23 +0200 +Subject: [PATCH] netfilter: flowtable: fix excessive hw offload attempts + after failure + +If a flow cannot be offloaded, the code currently repeatedly tries again as +quickly as possible, which can significantly increase system load. +Fix this by limiting flow timeout update and hardware offload retry to once +per second. + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/net/netfilter/nf_flow_table_core.c ++++ b/net/netfilter/nf_flow_table_core.c +@@ -331,8 +331,10 @@ void flow_offload_refresh(struct nf_flow + u32 timeout; + + timeout = nf_flowtable_time_stamp + flow_offload_get_timeout(flow); +- if (READ_ONCE(flow->timeout) != timeout) ++ if (timeout - READ_ONCE(flow->timeout) > HZ) + WRITE_ONCE(flow->timeout, timeout); ++ else ++ return; + + if (likely(!nf_flowtable_hw_offload(flow_table))) + return; |