[dpdk-dev] [RFC] add flow action context API

[Andrey Vesnovaty]

On Thu, Jun 4, 2020 at 3:37 PM Jerin Jacob <jerinjacobk at gmail.com> wrote:

> I would suggest adding rte_flow driver implementers if there is a
> change in rte_flow_ops in RFC so that
> your patch will get enough. I added the maintainers of rte_flow PMD[1]
> implementers in Cc.
>
>
> >>
> >> Would the following additional API suffice the motivation?
> >>
> >> rte_flow_modify_action(struct rte_flow * flow,  const struct
> >> rte_flow_action actions[])
> >
> >
> > This API limits the scope to single flow which isn't the goal for the
> proposed change.
>
> Yes. But we need to find the balance between HW features(driver
> interface) and public API?
> Is Mellanox HW has the support for native shared HW ACTION context?
>

Yes, I'm working on a shared context for RSS action, patched will be
available in a couple of weeks.
Other candidates for this kind of API extension are counters/meters.


> if so, it makes sense to have such a fat public API as you suggested.
> If not, it is a matter of application to iterate over needed flows to
> modify action through rte_flow_modify_action().
>
> Assume Mellanox HW has native HW ACTION context and the majority of
> the other HW[1] does not
> have, then IMO, We should have common code, to handle in this complex
> state machine
> implementation of action_ctx_create, action_ctx_destroy,
> rte_flow_action_ctx_modify, action_ctx_query
> in case PMD does not support it. (If PMD/HW supports it then it can
> use native implementation)
>

Does it mean that all PMDs will support action-ctx create/destroy/update
for all types of actions?

Reason:
> 1) I think, All the HW will have the the option to update the ACTION
> for the given flow.
> octeontx2 has it. If not, let's discuss what is typical HW abstraction
> ACTION only update.
>


> 2) This case can be implemented if PMD just has flow_modify_action()
> support.
> Multiple flows will be matter will be iterating over all registered flow.
>

General case won't be just iteration over all flows but:
1. destroy flow
2. create "modified" action
3. create flow with the action from (2)
Is this what you mean by "common code" to handle action-ctx
create/destroy/update implementation?

>
> 3) Avoid code duplication on all of the below PMDs[1]
>
>
>
> [1]
> drivers/net/hinic/hinic_pmd_flow.c:const struct rte_flow_ops
> hinic_flow_ops = {
> drivers/net/ipn3ke/ipn3ke_flow.h:extern const struct rte_flow_ops
> ipn3ke_flow_ops;
> drivers/net/i40e/i40e_flow.c:const struct rte_flow_ops i40e_flow_ops = {
> drivers/net/qede/qede_filter.c:const struct rte_flow_ops qede_flow_ops = {
> drivers/net/octeontx2/otx2_flow.h:extern const struct rte_flow_ops
> otx2_flow_ops;
> drivers/net/ice/ice_generic_flow.h:extern const struct rte_flow_ops
> ice_flow_ops;
> drivers/net/tap/tap_flow.c:static const struct rte_flow_ops tap_flow_ops =
> {
> drivers/net/dpaa2/dpaa2_ethdev.h:extern const struct rte_flow_ops
> dpaa2_flow_ops;
> drivers/net/e1000/e1000_ethdev.h:extern const struct rte_flow_ops
> igb_flow_ops;
> drivers/net/enic/enic_flow.c:const struct rte_flow_ops enic_flow_ops = {
> drivers/net/bonding/rte_eth_bond_flow.c:const struct rte_flow_ops
> bond_flow_ops = {
> drivers/net/mlx5/mlx5_flow.c:static const struct rte_flow_ops
> mlx5_flow_ops = {
> drivers/net/igc/igc_flow.h:extern const struct rte_flow_ops igc_flow_ops;
> drivers/net/cxgbe/cxgbe_flow.c:static const struct rte_flow_ops
> cxgbe_flow_ops = {
> drivers/net/failsafe/failsafe_private.h:extern const struct
> rte_flow_ops fs_flow_ops;
> drivers/net/mvpp2/mrvl_flow.c:const struct rte_flow_ops mrvl_flow_ops = {
> drivers/net/iavf/iavf_generic_flow.c:const struct rte_flow_ops
> iavf_flow_ops = {
> drivers/net/hns3/hns3_flow.c:static const struct rte_flow_ops
> hns3_flow_ops = {
> drivers/net/bnxt/bnxt_flow.c:const struct rte_flow_ops bnxt_flow_ops = {
> drivers/net/mlx4/mlx4_flow.c:static const struct rte_flow_ops
> mlx4_flow_ops = {
> drivers/net/sfc/sfc_flow.c:const struct rte_flow_ops sfc_flow_ops = {
> drivers/net/softnic/rte_eth_softnic_flow.c:const struct rte_flow_ops
> pmd_flow_ops = {
> drivers/net/ixgbe/ixgbe_ethdev.h:extern const struct rte_flow_ops
> ixgbe_flow_ops;
>