From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
To: Michael Savisko <michaelsav@nvidia.com>,
Ferruh Yigit <ferruh.yigit@xilinx.com>,
Thomas Monjalon <thomas@monjalon.net>
Cc: orika@nvidia.com, viacheslavo@nvidia.com, asafp@nvidia.com,
Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
dev@dpdk.org
Subject: Re: [PATCH v3] ethdev: add send to kernel action
Date: Mon, 26 Sep 2022 16:06:51 +0300 [thread overview]
Message-ID: <c70846a3-f840-1407-4024-bacd0cbb5da8@oktetlabs.ru> (raw)
In-Reply-To: <20220919155013.61473-1-michaelsav@nvidia.com>
On 9/19/22 18:50, Michael Savisko wrote:
> In some cases application may receive a packet that should have been
> received by the kernel. In this case application uses KNI or other means
> to transfer the packet to the kernel.
>
> With bifurcated driver we can have a rule to route packets matching
> a pattern (example: IPv4 packets) to the DPDK application and the rest
> of the traffic will be received by the kernel.
> But if we want to receive most of the traffic in DPDK except specific
> pattern (example: ICMP packets) that should be processed by the kernel,
> then it's easier to re-route these packets with a single rule.
>
> This commit introduces new rte_flow action which allows application to
> re-route packets directly to the kernel without software involvement.
>
> Add new testpmd rte_flow action 'send_to_kernel'. The application
> may use this action to route the packet to the kernel while still
> in the HW.
>
> Example with testpmd command:
>
> flow create 0 ingress priority 0 group 1 pattern eth type spec 0x0800
> type mask 0xffff / end actions send_to_kernel / end
>
> Signed-off-by: Michael Savisko <michaelsav@nvidia.com>
> ---
> app/test-pmd/cmdline_flow.c | 9 +++++++++
> doc/guides/testpmd_app_ug/testpmd_funcs.rst | 2 ++
> lib/ethdev/rte_flow.c | 1 +
> lib/ethdev/rte_flow.h | 10 ++++++++++
> 4 files changed, 22 insertions(+)
>
> diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
> index 7f50028eb7..042f6b34a6 100644
> --- a/app/test-pmd/cmdline_flow.c
> +++ b/app/test-pmd/cmdline_flow.c
> @@ -612,6 +612,7 @@ enum index {
> ACTION_PORT_REPRESENTOR_PORT_ID,
> ACTION_REPRESENTED_PORT,
> ACTION_REPRESENTED_PORT_ETHDEV_PORT_ID,
> + ACTION_SEND_TO_KERNEL,
> };
>
> /** Maximum size for pattern in struct rte_flow_item_raw. */
> @@ -1872,6 +1873,7 @@ static const enum index next_action[] = {
> ACTION_CONNTRACK_UPDATE,
> ACTION_PORT_REPRESENTOR,
> ACTION_REPRESENTED_PORT,
> + ACTION_SEND_TO_KERNEL,
> ZERO,
> };
>
> @@ -6341,6 +6343,13 @@ static const struct token token_list[] = {
> .help = "submit a list of associated actions for red",
> .next = NEXT(next_action),
> },
> + [ACTION_SEND_TO_KERNEL] = {
> + .name = "send_to_kernel",
> + .help = "send packets to kernel",
> + .priv = PRIV_ACTION(SEND_TO_KERNEL, 0),
> + .next = NEXT(NEXT_ENTRY(ACTION_NEXT)),
> + .call = parse_vc,
> + },
>
> /* Top-level command. */
> [ADD] = {
> diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> index 330e34427d..c259c8239a 100644
> --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> @@ -4189,6 +4189,8 @@ This section lists supported actions and their attributes, if any.
>
> - ``ethdev_port_id {unsigned}``: ethdev port ID
>
> +- ``send_to_kernel``: send packets to kernel.
> +
> Destroying flow rules
> ~~~~~~~~~~~~~~~~~~~~~
>
> diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c
> index 501be9d602..627c671ce4 100644
> --- a/lib/ethdev/rte_flow.c
> +++ b/lib/ethdev/rte_flow.c
> @@ -259,6 +259,7 @@ static const struct rte_flow_desc_data rte_flow_desc_action[] = {
> MK_FLOW_ACTION(CONNTRACK, sizeof(struct rte_flow_action_conntrack)),
> MK_FLOW_ACTION(PORT_REPRESENTOR, sizeof(struct rte_flow_action_ethdev)),
> MK_FLOW_ACTION(REPRESENTED_PORT, sizeof(struct rte_flow_action_ethdev)),
> + MK_FLOW_ACTION(SEND_TO_KERNEL, 0),
> };
>
> int
> diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
> index a79f1e7ef0..bf076087b3 100644
> --- a/lib/ethdev/rte_flow.h
> +++ b/lib/ethdev/rte_flow.h
> @@ -2879,6 +2879,16 @@ enum rte_flow_action_type {
> * @see struct rte_flow_action_ethdev
> */
> RTE_FLOW_ACTION_TYPE_REPRESENTED_PORT,
> +
> + /**
> + * Send packets to the kernel, without going to userspace at all.
> + * The packets will be received by the kernel driver sharing
May be it is better to mentioned bifurcated driver model and
add a reference to the documentation.
> + * the same device as the DPDK port.
Which DPDK port? There is no control structure associated
with the action.
I guess it is the port used to create the flow rule.
If so, it should be documented that it is non-transfer
action and highlighted that the port used to create
the action.
> + * This is an ingress action only.
> + *
> + * No associated configuration structure.
> + */
> + RTE_FLOW_ACTION_TYPE_SEND_TO_KERNEL,
> };
>
> /**
next prev parent reply other threads:[~2022-09-26 13:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 11:35 [RFC] ethdev: add send to kernel action Michael Savisko
2022-08-15 12:02 ` Ori Kam
2022-08-16 9:50 ` Ferruh Yigit
2022-09-12 13:32 ` Thomas Monjalon
2022-09-12 13:39 ` Michael Savisko
2022-09-12 14:41 ` Andrew Rybchenko
2022-09-13 12:09 ` Michael Savisko
2022-09-14 9:57 ` Thomas Monjalon
2022-09-14 9:32 ` [PATCH v2] " Michael Savisko
2022-09-19 15:50 ` [PATCH v3] " Michael Savisko
2022-09-20 11:08 ` Ori Kam
2022-09-26 13:06 ` Andrew Rybchenko [this message]
2022-09-28 14:30 ` Michael Savisko
2022-09-29 14:54 ` [PATCH v4] " Michael Savisko
2022-10-03 7:53 ` Andrew Rybchenko
2022-10-03 8:23 ` Ori Kam
2022-10-03 9:44 ` Andrew Rybchenko
2022-10-03 9:57 ` Ori Kam
2022-10-03 10:47 ` Andrew Rybchenko
2022-10-03 11:06 ` Ori Kam
2022-10-03 11:08 ` Andrew Rybchenko
2022-10-03 16:34 ` [PATCH v5] " Michael Savisko
2022-10-04 7:48 ` Andrew Rybchenko
2022-09-20 10:57 ` [PATCH v2] " Ori Kam
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