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mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id A21A04007A; Mon, 3 Aug 2020 15:34:01 +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 5131B340087; Mon, 3 Aug 2020 15:34:01 +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 16:33:56 +0100 To: Ori Kam , Thomas Monjalon , "John McNamara" , Marko Kovacevic CC: "dev@dpdk.org" References: <1596464905-43867-1-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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dev-bounces@dpdk.org Sender: "dev" On 8/3/20 6:22 PM, Ori Kam wrote: > Hi Andrew, > >> -----Original Message----- >> From: Andrew Rybchenko >> >> On 8/3/20 5:28 PM, Ori Kam wrote: >>> Using the rte_flow action RSS types field, >>> may result in an 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 >>> --- >>> doc/guides/prog_guide/rte_flow.rst | 10 ++++++++++ >>> 1 file changed, 10 insertions(+) >>> >>> diff --git a/doc/guides/prog_guide/rte_flow.rst >> b/doc/guides/prog_guide/rte_flow.rst >>> index 3e5cd1e..d000560 100644 >>> --- a/doc/guides/prog_guide/rte_flow.rst >>> +++ b/doc/guides/prog_guide/rte_flow.rst >>> @@ -1735,6 +1735,16 @@ 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. >>> + >>> +- Conflicting between RSS types and the requested pattern to match, >>> + for example matching on UDP and hashing RSS on TCP. >> IMHO it is not a problem at all, but good to clarify anyway. >> > Agree this patch is just for clarification. > >>> + >>> +- Hashing on types that are not supported by the PMD. >> Shouldn't it return error to the caller? >> > That’s depends, if for example the application requested eth and IPv4, > and the PMD can do only IPv4 so according to this, the PMD will just do IPv4. I think it is a bad behaviour. Application has required information to provide correct parameters and therefore incorrect should be rejected. Am I missing something? >>> + >>> 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. >>>