Merge branch 'TC-refactor-act_mirred-packets-re-injection'
Paolo Abeni says:
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TC: refactor act_mirred packets re-injection
This series is aimed at improving the act_mirred redirect performances.
Such action is used by OVS to represent TC S/W flows, and it's current largest
bottle-neck is the need for a skb_clone() for each packet.
The first 2 patches introduce some cleanup and safeguards to allow extending
tca_result - we will use it to store RCU protected redirect information - and
introduce a clear separation between user-space accessible tcfa_action
values and internal values accessible only by the kernel.
Then a new tcfa_action value is introduced: TC_ACT_REINJECT, similar to
TC_ACT_REDIRECT, but preserving the mirred semantic. Such value is not
accessible from user-space.
The last patch exploits the newly introduced infrastructure in the act_mirred
action, to avoid a skb_clone, when possible.
Overall this the above gives a ~10% performance improvement in forwarding tput,
when using the TC S/W datapath.
v1 -> v2:
- preserve the rcu lock in act_bpf
- add and use a new action value to reinject the packets, preserving the mirred
semantic
v2 -> v3:
- renamed to new action as TC_ACT_REINJECT
- TC_ACT_REINJECT is not exposed to user-space
v3 -> v4:
- dropped the TC_ACT_REDIRECT patch
- report failure via extack, too
- rename the new action as TC_ACT_REINSERT
- skip clone only if the control action don't touch tcf_result
v4 -> v5:
- fix a couple of build issue reported by kbuild bot
- dont split messages
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
