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Date: Mon, 17 Oct 2022 16:48:42 +0200
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Subject: rte-flow: unmatched ingress traffic default action
From: "Robin Jarry" <rjarry@redhat.com>
To: "Ori Kam" <orika@nvidia.com>, "Thomas Monjalon" <thomas@monjalon.net>,
<dev@dpdk.org>
Cc: "Ilya Maximets" <i.maximets@ovn.org>, "David Marchand"
<david.marchand@redhat.com>, "Aaron Conole" <aconole@redhat.com>, "Eelco
Chaudron" <echaudro@redhat.com>, "Kevin Traynor" <ktraynor@redhat.com>
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Hi Ori, all,
>From what I can read in the docs in the "Isolated Mode"[1] section:
> The general expectation for ingress traffic is that flow rules process
> it first; the remaining unmatched or pass-through traffic usually ends
> up in a queue (with or without RSS, locally or in some sub-device
> instance) depending on the global configuration settings of a port.
[1]: https://doc.dpdk.org/guides/prog_guide/rte_flow.html#flow-isolated-mod=
e
Should I read "general expectation" as a simple recommendation or is it
a requirement from the RTE flow API?
I realize that this eventually will depend on each driver, firmware
and/or hardware. However, would it be reasonable to rely on such
a behaviour to implement preemptive queue redirection prior to regular
RSS?
For the sake of argument, let's say I have 3 RX queues configured with
an RSS redirection table set as follows:
0 1 0 1 0 1 0 1 0 1 ..... 1 0 1
And I configure a single flow:
struct rte_flow_error error;
struct rte_flow *flow;
flow =3D rte_flow_create(
port_id,
(const struct rte_flow_attr){ .ingress =3D 1 },
(const struct rte_flow_item []) {
{
.type =3D RTE_FLOW_ITEM_TYPE_ETH,
.spec =3D &(const struct rte_flow_item_eth){
.type =3D htons(0x1234),
},
.mask =3D &(const struct rte_flow_item_eth){
.type =3D htons(0xffff),
},
},
{ .type =3D RTE_FLOW_ITEM_TYPE_END },
},
(const struct rte_flow_action actions[]){
{
.type =3D RTE_FLOW_ACTION_TYPE_QUEUE,
.conf =3D &(const struct rte_flow_action_queue) {
.index =3D 2,
},
},
{ .type =3D RTE_FLOW_ACTION_TYPE_END },
},
&error,
);
Can I expect *all* ingress traffic *not* matching ether_type=3D0x1234 to
be redirected to queues 0 and 1 following the default RSS algorithm?
If folks from NIC vendors could comment on their own implementation, it
would be much appreciated.
Thanks in advance.
--=20
Robin Jarry
Principal Software Engineer
Red Hat