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mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 07BA7220054; Thu, 6 Aug 2020 12:14:48 +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 94CC6780069; Thu, 6 Aug 2020 12:14:47 +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; Thu, 6 Aug 2020 13:14:42 +0100 To: Ori Kam , Thomas Monjalon , "david.marchand@redhat.com" , John McNamara , Marko Kovacevic CC: "dev@dpdk.org" References: <1596464905-43867-1-git-send-email-orika@mellanox.com> <1596528811-138806-1-git-send-email-orika@mellanox.com> <5cc28959-f649-f262-eb68-2bf44727c786@solarflare.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= 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SMEX-12.5.0.1300-8.6.1012-25586.005 X-MDID: 1596716088-fONkNVoOtS-o 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 8/5/20 5:08 PM, Ori Kam wrote: > Hi Andrew, > >> -----Original Message----- >> From: Andrew Rybchenko >> >> 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. >> > I fully agree with you that it is common to use both UDP and TCP and > expect it to work based on the traffic. this is the point of this patch. > To clarify that this is valid input and the PMD will work in best effort mode. Just don't name it "Conflicting RSS types", may be "Non-applicable RSS types", but it collapses two bullets into one. > >>> + >>> +- 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. >> > Just like my comment from above. > >>> + >>> +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. >> > The flow should be rejected even if it is used with some type that is supported? Yes, if user ask for something what is not supported at all, it is a problem and user should be notified. May be it is too restrictive, but I'd prefer this way. User has all required information in dev_info and can remove unsupported hash types from request. IMHO, it should enforce user check the result to be not empty and handle it properly. > > >>> 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. >>> >