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 554E7A053E; Wed, 5 Aug 2020 15:39:32 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id A425A2C23; Wed, 5 Aug 2020 15:39:31 +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 3EADA2B98 for ; Wed, 5 Aug 2020 15:39:29 +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 AAB8C200B7; Wed, 5 Aug 2020 13:39:28 +0000 (UTC) Received: from us4-mdac16-34.at1.mdlocal (unknown [10.110.49.218]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id A78BE8009B; Wed, 5 Aug 2020 13:39:28 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.49.106]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 2758B40077; Wed, 5 Aug 2020 13:39:28 +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 AE5ABB40082; Wed, 5 Aug 2020 13:39:27 +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 14:39:21 +0100 To: Ori Kam , , , John McNamara , "Marko Kovacevic" CC: References: <1596464905-43867-1-git-send-email-orika@mellanox.com> <1596528811-138806-1-git-send-email-orika@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-17.160600-8.000000-10 X-TMASE-MatchedRID: oHOSwQSJZWgeimh1YYHcKPZvT2zYoYOwC/ExpXrHizweeOmdPBXZbhX0 C/Gbw7Ij2Vt6jneXAxGgihKUOJd73go28QW8mesc1uDM+OtX7Bw0AJe3B5qfBgCOLD+ckgKHW5b BKjPYdXK7VoNmAnN570AFcnpD9mZeI9uvmW7ehh6a+cpJvTbSHKCAPRBOSGO0HDQcqEqNN+nioA GxQy4eNW2c8p3lLh40xGNgxQRfzKJ0yq4N5y479QPZZctd3P4BK7VOL9908cGExk6c4qzx8tICC jmuvF6WH5TnHYZFBIiMZEL1McgH2uRMh+TeDlc3dhnFihmbnwV99ekRHlOQkfI35cQSjJK+tXac NyqOlmTVAskxVwyV0KENUJrA3QhwnzvEQI9J6k5ZMZ6MZ0H1UgPelS8fCnKu3FJULPGBSs4mNhb +NkYsr8lkcUYfS7ghp5nJLNnUNHbehfA42bn5254CIKY/Hg3AtOt1ofVlaoLUHQeTVDUrItRnEQ CUU+jzjoczmuoPCq1VIWUfqgWrewQhXLPSzFpZcP4z3dEsPW2nN+n2/LM+lvBal0IYI9vN X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--17.160600-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25584.005 X-MDID: 1596634768-cW8wU5Bu6FYP Subject: Re: [dpdk-dev] [PATCH v2] doc: update RSS action with best effort 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 8/4/20 11:13 AM, Ori Kam wrote: > Using the rte_flow action RSS types field, > may result in undefined outcome. > > For example selecting both UDP and TCP, > selecting TCP RSS type but the pattern is targeting UDP traffic. > another option is that the PMD doesn't support all requested types. > > Until now, it wasn't clear what will happen in such cases. > This commit clarify this issue by stating that the PMD > will work in the best-effort mode. > > Signed-off-by: Ori Kam > --- > v2: > * Based on ML, update that using only unsupported hash type > may cause the flow to be rejected by PMD. > --- > doc/guides/prog_guide/rte_flow.rst | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst > index 3e5cd1e..d730b66 100644 > --- a/doc/guides/prog_guide/rte_flow.rst > +++ b/doc/guides/prog_guide/rte_flow.rst > @@ -1735,6 +1735,17 @@ unspecified "best-effort" settings from the underlying PMD, which depending > on the flow rule, may result in anything ranging from empty (single queue) > to all-inclusive RSS. > > +Best effort will be used, in case there is a conflict inside the rule. > +The conflict can be the result of: > + > +- Conflicting RSS types, for example setting both UDP and TCP. Thinking more about it, I see no conflict at all. It is common to specify both TCP and UDP in hash function if user wants to take TCP ports for TCP packets and UDP ports for UDP into account. > + > +- Conflicting between RSS types and the requested pattern to match, > + for example matching on UDP and hashing RSS on TCP. I'd not name it a conflict either. It is just common rule when applicable fields are used only. > + > +If requested RSS hash type is not supported, > +and no supported hash type is requested then the PMD may reject the flow. > + I disagree with such description. If requested RSS hash type is not supported (not present in dev_info.flow_type_rss_offloads), it must be rejected and error returned. If requested RSS hash type is not supported for a packet matching the rule, but supported in general (present in dev_info.flow_type_rss_offloads), part of RSS hash type specification may be ignored and only applicable bits are used. If result is empty, PMD may reject the flow rule. > Note: RSS hash result is stored in the ``hash.rss`` mbuf field which > overlaps ``hash.fdir.lo``. Since `Action: MARK`_ sets the ``hash.fdir.hi`` > field only, both can be requested simultaneously. >