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 2F354A053A; Wed, 5 Aug 2020 13:15:10 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 749D52C23; Wed, 5 Aug 2020 13:15:09 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id 80C392BB5 for ; Wed, 5 Aug 2020 13:15:08 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.144]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 0A8E52007E; Wed, 5 Aug 2020 11:15:08 +0000 (UTC) Received: from us4-mdac16-5.at1.mdlocal (unknown [10.110.49.156]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 0758E800A4; Wed, 5 Aug 2020 11:15:08 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.8]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 566D540073; Wed, 5 Aug 2020 11:15:07 +0000 (UTC) Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id B913A4C005A; Wed, 5 Aug 2020 11:15:06 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 5 Aug 2020 12:14:59 +0100 To: Viacheslav Ovsiienko , CC: , , , , , , , , , References: <1596452291-25535-1-git-send-email-viacheslavo@mellanox.com> <1596617395-29271-1-git-send-email-viacheslavo@mellanox.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 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SMEX-12.5.0.1300-8.6.1012-25584.005 X-TM-AS-Result: No-11.811900-8.000000-10 X-TMASE-MatchedRID: WMT2WRIkHPPmLzc6AOD8DfHkpkyUphL9+wkHrk36xsx8Wx0lu+VLLdMk 9VBp7XNFgNL6W72wJ7T6X7B56FY7bFmGwsZJV9auMiMrbc70PfcvsOOmgOo1mTP3zxumESVRnCW TaXAK9QPTSoy/oX1f7puSRH6NDLbvg+C3IARONQ1uh7qwx+D6T6GEqigf79/L1VNlojpO42i+mF UWJD5GApq7+DtMdYiVTtmxQ5yo+kNtlSagkQXaob6EJGSqPePTMsovp/h9OdF/KM1eVsG+dGfrI xi5rIINAz5+slzmJYHKV7L233u/UCKEYwBLB2teL8y5bOx03xk5lSSSzBNFmOA8SwvRwh+OcDYB tqUkx7zp6MBi+MH1la0YOPKAd6UKZwC5j4jCfuOVUcz8XpiS9DsY2/UEG7fkrjXfqbt3UxqdJYS 4rHLiE7NQlIvE8Nmdnagtny7ZPcRNfs8n85Te8oMbH85DUZXyseWplitmp0j6C0ePs7A07cjHch ynrO5b+33HoTfVglPZWpVZuSJWSGDeMInN9m33mY+qP9OMitI= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--11.811900-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25584.005 X-MDID: 1596626107-q7hXuRCWBfSg Subject: Re: [dpdk-dev] [PATCH v2] doc: announce changes to ethdev rxconf structure 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 8/5/20 11:49 AM, Viacheslav Ovsiienko wrote: > The DPDK datapath in the transmit direction is very flexible. > The applications can build multi-segment packets and manages > almost all data aspects - the memory pools where segments > are allocated from, the segment lengths, the memory attributes > like external, registered, etc. > > In the receiving direction, the datapath is much less flexible, > the applications can only specify the memory pool to configure > the receiving queue and nothing more. The packet being received > can only be pushed to the chain of the mbufs of the same data > buffer size and allocated from the same pool. In order to extend > the receiving datapath buffer description it is proposed to add > the new fields into rte_eth_rxconf structure: > > struct rte_eth_rxconf { > ... > uint16_t rx_split_num; /* number of segments to split */ > uint16_t *rx_split_len; /* array of segment lengths */ > struct rte_mempool **mp; /* array of segment memory pools */ > ... > }; > > The non-zero value of rx_split_num field configures the receiving > queue to split ingress packets into multiple segments to the mbufs > allocated from various memory pools according to the specified > lengths. The zero value of rx_split_num field provides the > backward compatibility and queue should be configured in a regular > way (with single/multiple mbufs of the same data buffer length > allocated from the single memory pool). > > The new approach would allow splitting the ingress packets into > multiple parts pushed to the memory with different attributes. > For example, the packet headers can be pushed to the embedded data > buffers within mbufs and the application data into the external > buffers attached to mbufs allocated from the different memory > pools. The memory attributes for the split parts may differ > either - for example the application data may be pushed into > the external memory located on the dedicated physical device, > say GPU or NVMe. This would improve the DPDK receiving datapath > flexibility preserving compatibility with existing API. > > The proposed extended description of receiving buffers might be > considered by other vendors to be involved into similar features > support, it is the subject for the further discussion. > > Signed-off-by: Viacheslav Ovsiienko > Acked-by: Jerin Jacob I"m OK with the idea in general and we'll work on details in the next release cycle. Acked-by: Andrew Rybchenko