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net: openvswitch: store sampling probability in cb.

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When a packet sample is observed, the sampling rate that was used is
important to estimate the real frequency of such event.

Store the probability of the parent sample action in the skb's cb area
and use it in psample action to pass it down to psample module.

Reviewed-by: Aaron Conole <aconole@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Ilya Maximets <i.maximets@ovn.org>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Link: https://patch.msgid.link/20240704085710.353845-7-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Moreno
2024-07-04 10:56:57 +02:00
committed by Jakub Kicinski
parent aae0b82b46
commit 71763d8a82
4 changed files with 23 additions and 4 deletions
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net/openvswitch/datapath.h
+3
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@@ -115,12 +115,15 @@ struct datapath {
* fragmented.
* @acts_origlen: The netlink size of the flow actions applied to this skb.
* @cutlen: The number of bytes from the packet end to be removed.
* @probability: The sampling probability that was applied to this skb; 0 means
* no sampling has occurred; U32_MAX means 100% probability.
*/
struct ovs_skb_cb {
struct vport *input_vport;
u16 mru;
u16 acts_origlen;
u32 cutlen;
u32 probability;
};
#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)