From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 019BCA00C5; Sun, 5 Jul 2020 15:40:07 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 4EA9A1DAF5; Sun, 5 Jul 2020 15:40:07 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [148.163.129.52]) by dpdk.org (Postfix) with ESMTP id 851EA1DAE5 for ; Sun, 5 Jul 2020 15:40:05 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.7.65.60]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 21F7D60074; Sun, 5 Jul 2020 13:40:05 +0000 (UTC) Received: from us4-mdac16-30.ut7.mdlocal (unknown [10.7.66.140]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 2D9432009A; Sun, 5 Jul 2020 13:40:05 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.7.66.34]) by 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Q6yz+UaYiIWUaTS7aUKdqCCSnIX6zgiXIt8WXwJnWTGejGdB9VKANFj+05gyNg9SYzwaQadagmX 4yv3R5RCEKBCVL7Jm5D/Z5BqraHjKC36RaxRX0L9yF4DyeABv+1QT4wfzn/hU95rCkndYOMVBlT IQBu46XNB7DVy7sVndhYEPw9gm2aZHfvvvjAtW9oJyoPRj0XK6c5ge9aLcX3zyN+XEEoySvnFC0 fMeQA5wiHAwExzEyV0q6ulNfuwaN9M1S3kJsRbNz5CYDcN91JvdXhRKGhNdp/kuQv9PIVnNfWlr 04vVSkr8vssEMbB5TxwZ2L+K1xqlHUpJFp3hnla8MyRT7cnv22Udj2/59koYEd+K6O5Nt50gPYw 0sr8LvXb4Bm7FqQnLgX19YzXAEsn3uvD+1Bkl7Qf11J5hhjjq+yx8oDl9BLwxr/m//6oStlzlGz Sh18kaEWMioiewS9c+PHq8e3nI3r9ZdlL8eonaVnRXm1iHN1bEQdG7H66TyH4gKq42LRYkAE3+j 4efjwmSaqgwM4LwjEk9C412C45kXJuVA4Exklx+3BndfXUhXQ== X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--13.184600-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25522.003 X-MDID: 1593956405-nF0tnerroodB Subject: Re: [dpdk-dev] [PATCH 0/2] ethdev: tunnel offload model X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 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" On 6/25/20 7:03 PM, Gregory Etelson wrote: > Hardware vendors implement tunneled traffic offload techniques > differently. Although RTE flow API provides tools capable to offload > all sorts of network stacks, software application must reference this > hardware differences in flow rules compilation. As the result tunneled > traffic flow rules that utilize hardware capabilities can be different > for the same traffic. > > Tunnel port offload proposed in [1] provides software application with > unified rules model for tunneled traffic regardless underlying > hardware. > - The model introduces a concept of a virtual tunnel port (VTP). > - The model uses VTP to offload ingress tunneled network traffic  > with RTE flow rules. > - The model is implemented as set of helper functions. Each PMD > implements VTP offload according to underlying hardware offload > capabilities. Applications must query PMD for VTP flow > items / actions before using in creation of a VTP flow rule. > > The model components: > - Virtual Tunnel Port (VTP) is a stateless software object that > describes tunneled network traffic. VTP object usually contains > descriptions of outer headers, tunnel headers and inner headers. > - Tunnel Steering flow Rule (TSR) detects tunneled packets and > delegates them to tunnel processing infrastructure, implemented > in PMD for optimal hardware utilization, for further processing. > - Tunnel Matching flow Rule (TMR) verifies packet configuration and > runs offload actions in case of a match. > > Application actions: > 1 Initialize VTP object according to tunnel > network parameters. > 2 Create TSR flow rule: > 2.1 Query PMD for VTP actions: application can query for VTP actions > more than once > int > rte_flow_tunnel_decap_set(uint16_t port_id, > struct rte_flow_tunnel *tunnel, > struct rte_flow_action **pmd_actions, > uint32_t *num_of_pmd_actions, > struct rte_flow_error *error); > > 2.2 Integrate PMD actions into TSR actions list. > 2.3 Create TSR flow rule: > flow create group 0 > match {tunnel items} / end > actions {PMD actions} / {App actions} / end > > 3 Create TMR flow rule: > 3.1 Query PMD for VTP items: application can query for VTP items > more than once > int > rte_flow_tunnel_match(uint16_t port_id, > struct rte_flow_tunnel *tunnel, > struct rte_flow_item **pmd_items, > uint32_t *num_of_pmd_items, > struct rte_flow_error *error); > > 3.2 Integrate PMD items into TMR items list: > 3.3 Create TMR flow rule > flow create group 0 > match {PMD items} / {APP items} / end > actions {offload actions} / end > > The model provides helper function call to restore packets that miss > tunnel TMR rules to its original state: > int > rte_flow_get_restore_info(uint16_t port_id, > struct rte_mbuf *mbuf, > struct rte_flow_restore_info *info, > struct rte_flow_error *error); > > rte_tunnel object filled by the call inside > rte_flow_restore_info *info parameter can be used by the application > to create new TMR rule for that tunnel. > > The model requirements: > Software application must initialize > rte_tunnel object with tunnel parameters before calling > rte_flow_tunnel_decap_set() & rte_flow_tunnel_match(). > > PMD actions array obtained in rte_flow_tunnel_decap_set() must be > released by application with rte_flow_action_release() call. > Application can release the actionsfter TSR rule was created. > > PMD items array obtained with rte_flow_tunnel_match() must be released > by application with rte_flow_item_release() call. Application can > release the items after rule was created. However, if the application > needs to create additional TMR rule for the same tunnel it will need > to obtain PMD items again. > > Application cannot destroy rte_tunnel object before it releases all > PMD actions & PMD items referencing that tunnel. > > [1] https://mails.dpdk.org/archives/dev/2020-June/169656.html Three copies of the above text here, in 2/2 description and 2/2 content in DPDK documentation is too much. IMHO, it should only one place in the documentation with brief summary in patch/series description.