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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB4987.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 08fc46fd-0ba9-469f-4c2e-08d903593cd8 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Apr 2021 17:33:25.6187 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ODQuAtGA5IURtlXVK/nt/NP4JEOeCODS6ZRqvcSGm0WRWcHdaEkwPr7Y04ZpW7u3pshzjaRcNFuO/+XiazTjwA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4124 Subject: Re: [dpdk-dev] [PATCH v4 1/3] ethdev: introduce conntrack flow action and item X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Archived-At: List-Archive: > -----Original Message----- > From: Bing Zhao > Sent: Monday, April 19, 2021 8:17 PM > Subject: [PATCH v4 1/3] ethdev: introduce conntrack flow action and item >=20 > This commit introduces the conntrack action and item. >=20 > Usually the HW offloading is stateless. For some stateful offloading > like a TCP connection, HW module will help provide the ability of a > full offloading w/o SW participation after the connection was > established. >=20 > The basic usage is that in the first flow rule the application should > add the conntrack action and jump to the next flow table. In the > following flow rule(s) of the next table, the application should use > the conntrack item to match on the result. >=20 > A TCP connection has two directions traffic. To set a conntrack > action context correctly, the information of packets from both > directions are required. >=20 > The conntrack action should be created on one ethdev port and supply > the peer ethdev port as a parameter to the action. After context > created, it could only be used between these two ethdev ports > (dual-port mode) or a single port. The application should modify the > action via the API "rte_action_handle_update" only when before using > it to create a flow rule with conntrack for the opposite direction. > This will help the driver to recognize the direction of the flow to > be created, especially in the single-port mode, in which case the > traffic from both directions will go through the same ethdev port > if the application works as an "forwarding engine" but not an end > point. There is no need to call the update interface if the > subsequent flow rules have nothing to be changed. >=20 > Query will be supported via "rte_action_handle_query" interface, > about the current packets information and connection status. The > fields query capabilities depends on the HW. >=20 > For the packets received during the conntrack setup, it is suggested > to re-inject the packets in order to make sure the conntrack module > works correctly without missing any packet. Only the valid packets > should pass the conntrack, packets with invalid TCP information, > like out of window, or with invalid header, like malformed, should > not pass. >=20 > Naming and definition: > https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/ > netfilter/nf_conntrack_tcp.h > https://elixir.bootlin.com/linux/latest/source/net/netfilter/ > nf_conntrack_proto_tcp.c >=20 > Other reference: > https://www.usenix.org/legacy/events/sec01/invitedtalks/rooij.pdf >=20 > Signed-off-by: Bing Zhao > --- Acked-by: Ori Kam Thanks, Ori