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 43D2EA052A; Mon, 3 Aug 2020 16:31:21 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 1B8AF1C027; Mon, 3 Aug 2020 16:31:21 +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 0FBC71C026 for ; Mon, 3 Aug 2020 16:31:19 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.143]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 9BC1F2008C; Mon, 3 Aug 2020 14:31:18 +0000 (UTC) Received: from us4-mdac16-14.at1.mdlocal (unknown [10.110.49.196]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 98BC88009B; Mon, 3 Aug 2020 14:31:18 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.49.31]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 2F31840074; Mon, 3 Aug 2020 14:31:18 +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 80E5B30005C; Mon, 3 Aug 2020 14:31:17 +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; Mon, 3 Aug 2020 15:31:08 +0100 To: Viacheslav Ovsiienko , CC: , , , , , , , , , References: <1596452291-25535-1-git-send-email-viacheslavo@mellanox.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h 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EMyCvCfVN1Fq0U6EhO9EE4mfV7NNMGm+69aS+7/zbj+qvcIF1TcLYKyX 25bCEU4JuEwK6CAtOwec7paWnDANeJMzS9ChH2T9RXdiukZQCgGnU+NxqV3DDUFungmhsSsC+9o bwkDBW0Z+gJHEBAc6whgx6ZNMPkEtJJYl9Vw2+/KcxB01DrjF91QQ0EgzIoPR0SxMhOhuA0QAaV 5dFN1EUYfjpEpb0hRFDo1EepEGBHM+YoPOMX63UPDrY9Cr30dZH6pHzc00RUrnCThanP/ghAp/k FJ4+WSoy0hhEFQalUB6iu7CTuzVBDkI+HOa3v3TttAWxuM5sl4weLVh3LZYSDLZyQk29Rf4YiwT tCK0c3W7swud9zS7e4uFKnm6AqrGVSxGzzbvSpdEIsnfsaOGrM0KIEi2RIp/cIeXLHhfmPaPssK P8huWhW51mAOaJCX1zzQe3iIXYft5G4Y1tj9tTT8Ckw9b/GFeL8Ia5qicU7sL9Tj77wy87PVl5v soSSsothDe22uQNpCNQ44vJI1jRnQcZ0vb1cb2/1dEgwtQ6NAYR+gKWoGXzpsoi2XrUn/Jsuf7R WbvUtyrusVRy4an8SAHAopEd76vUjfuJDB3SK4p1u4KpSlas9XVbAtmhq7c0LvvI5fFDssggZZE jf6F6A== X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--15.353700-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25580.005 X-MDID: 1596465078-Bex-eohyod4M Subject: Re: [dpdk-dev] ***Spam*** [PATCH] 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 8/3/20 1:58 PM, Viacheslav Ovsiienko wrote: > The DPDK datapath in the transmit direction is very flexible. > The applications can build multisegment 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. In order to extend the > receiving datapath capabilities 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 lengthes */ > 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). >From the above description it is not 100% clear how it will coexist with:  - existing mb_pool argument of the rte_eth_rx_queue_setup()  - DEV_RX_OFFLOAD_SCATTER  - DEV_RX_OFFLOAD_HEADER_SPLIT How will application know that the feature is supported? Limitations? Is it always split by specified/fixed length? What happens if header length is actually different? > 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. > > Signed-off-by: Viacheslav Ovsiienko > --- > doc/guides/rel_notes/deprecation.rst | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst > index ea4cfa7..cd700ae 100644 > --- a/doc/guides/rel_notes/deprecation.rst > +++ b/doc/guides/rel_notes/deprecation.rst > @@ -99,6 +99,11 @@ Deprecation Notices > In 19.11 PMDs will still update the field even when the offload is not > enabled. > > +* ethdev: add new fields to ``rte_eth_rxconf`` to configure the receiving > + queues to split ingress packets into multiple segments according to the > + specified lengths into the buffers allocated from the specified > + memory pools. The backward compatibility to existing API is preserved. > + > * ethdev: ``rx_descriptor_done`` dev_ops and ``rte_eth_rx_descriptor_done`` > will be deprecated in 20.11 and will be removed in 21.11. > Existing ``rte_eth_rx_descriptor_status`` and ``rte_eth_tx_descriptor_status``