On Fri, 3 May 2019 15:59:28 +0100, Edward Cree wrote: > When the flow_offload infrastructure was added, a couple of things that > were previously possible for drivers to support in TC offload were not > plumbed through, perhaps because the drivers in the tree did not fully > or correctly implement them. > The main issue was with statistics; in TC (and in the previous offload > API) statistics are per-action, though generally only on 'delivery' > actions like mirred, ok and shot. Actions also have an index, which > may be supplied by the user, which allows the sharing of entities such > as counters between multiple rules. The existing driver implementations > did not support this, however, instead allocating a single counter per > rule. The flow_offload API did not support this either, as (a) the > action index never reached the driver, and (b) the TC_CLSFLOWER_STATS > callback was only able to return a single set of stats which were added > to all counters for actions on the rule. Patch #1 of this series fixes > (a) by storing tcfa_index in a new action_index member of struct > flow_action_entry, while patch #2 fixes (b) by adding a new callback, > TC_CLSFLOWER_STATS_BYINDEX, which retrieves statistics for a specified > action_index rather than by rule (although the rule cookie is still > passed as well). > Patch #3 adds flow_rule_match_cvlan(), analogous to > flow_rule_match_vlan() but accessing FLOW_DISSECTOR_KEY_CVLAN instead > of FLOW_DISSECTOR_KEY_VLAN, to allow offloading inner VLAN matches. > This patch series does not include any users of these new interfaces; > the driver in which I hope to use them does not yet exist upstream as > it is for hardware which is still under development. However I've CCed > developers of various other drivers that implement TC offload, in case > any of them want to implement support. Otherwise I imagine that David > won't be willing to take this without a user, in which case I'll save > it to submit alongside the aforementioned unfinished driver (hence the > RFC tags for now).
Thanks for making this clear, I'd also like to make a disclaimer that my comments on the patches are not an indication that I think these patches are worth merging right now :) > Edward Cree (3): > flow_offload: copy tcfa_index into flow_action_entry > flow_offload: restore ability to collect separate stats per action > flow_offload: support CVLAN match > > include/net/flow_offload.h | 3 +++ > include/net/pkt_cls.h | 2 ++ > net/core/flow_offload.c | 7 +++++++ > net/sched/cls_api.c | 1 + > net/sched/cls_flower.c | 30 ++++++++++++++++++++++++++++++ > 5 files changed, 43 insertions(+)
