If nobody is listening on the multicast group, generating the sample,
which involves copying packet data, seems completely unnecessary.
Return fast in this case.
Signed-off-by: Adrian Moreno <amore...@redhat.com>
---
net/psample/psample.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/psample/psample.c b/net/psample/psample.c
index b37488f426bc..1c76f3e48dcd 100644
--- a/net/psample/psample.c
+++ b/net/psample/psample.c
@@ -376,6 +376,10 @@ void psample_sample_packet(struct psample_group *group,
struct sk_buff *skb,
void *data;
int ret;
+ if (!genl_has_listeners(&psample_nl_family, group->net,
+ PSAMPLE_NL_MCGRP_SAMPLE))
+ return;
+
meta_len = (in_ifindex ? nla_total_size(sizeof(u16)) : 0) +
(out_ifindex ? nla_total_size(sizeof(u16)) : 0) +
(md->out_tc_valid ? nla_total_size(sizeof(u16)) : 0) +
--
2.45.1
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