diff options
| author | Adrian Moreno <amorenoz@redhat.com> | 2024-07-04 11:56:54 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-07-06 03:45:47 +0300 |
| commit | c35d86a23029f1186e3c7a65df7c38b762fb0434 (patch) | |
| tree | e1b217cd535dab72f65bfc23711c691da36abf76 /net/psample | |
| parent | 03448444ae5c6e1de1ae7ff9fa19dc320eeb2d49 (diff) | |
| download | linux-c35d86a23029f1186e3c7a65df7c38b762fb0434.tar.xz | |
net: psample: skip packet copy if no listeners
If nobody is listening on the multicast group, generating the sample,
which involves copying packet data, seems completely unnecessary.
Return fast in this case.
Reviewed-by: Aaron Conole <aconole@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Link: https://patch.msgid.link/20240704085710.353845-4-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/psample')
| -rw-r--r-- | net/psample/psample.c | 4 |
1 files changed, 4 insertions, 0 deletions
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) + |