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Thu, 24 May 2018 06:34:01 +0000 From: Matan Azrad To: Yongseok Koh CC: Shahaf Shuler , Adrien Mazarguil , =?iso-8859-1?Q?N=E9lio_Laranjeiro?= , "dev@dpdk.org" , "stable@dpdk.org" , "Xueming(Steven) Li" Thread-Topic: [dpdk-dev] [PATCH] net/mlx5: fix GRE flow rule Thread-Index: AQHT8ji4UdW7+yaJAE27AdV43Ftbk6Q8wtFAgABSvgCAAARNsIAAiu+AgAALDKA= Date: Thu, 24 May 2018 06:34:01 +0000 Message-ID: References: <20180523015157.35716-1-yskoh@mellanox.com> <20180523100116.GA11530@minint-98vp2qg> <20180523183359.GA13339@yongseok-MBP.local> In-Reply-To: <20180523183359.GA13339@yongseok-MBP.local> Accept-Language: en-US, he-IL Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=matan@mellanox.com; x-originating-ip: [193.47.165.251] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; VI1PR0501MB3582; 7:GaBw7Vd++IyzrOvw6ko4X70ofCNGFNThfq6fg6+T6ZQ0UUPsrujfe5gzcvYQrmJ5xtRwLZHEBOJaEFVZgCg3V1gB09oyxas4OVd785EvQVZVpqqPAtOn1q0Z7zGngr85KOkR4dqirISN68EeTJCbNS7eg3+RQ8FrUAI3oyPTkpjUsCdplwTVHmMGgTjtwYye3HBc+1nU9oLe//2Yf8jw3q90RPdmsmBybVLeSMvuxbQhhmVFcoEdB9Ec5d+n9xAU x-ms-exchange-antispam-srfa-diagnostics: SOS; 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DIR:OUT; SFP:1101; SCL:1; SRVR:VI1PR0501MB3582; H:VI1PR0501MB2608.eurprd05.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: dsW/wdOZbb7DqNlrDWdFhAj6wbGW85w/o5Yrx9pTMNbn/w42k8es9Y6GP9wUeaLzuuPVy55rnK4cbUPi+eI2xrnJDXG6mLWQI8oq3O6jqz0wfBjA080aWN+JYfgyDuZQc0pvGchvVERG0s6AK+2FaHVoDX3RYo/WC6SapZdkoXn0geDREiDg3IxGu0Q2MpJA spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: b0c2bfb1-a1b1-422c-ef84-08d5c14056a6 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: b0c2bfb1-a1b1-422c-ef84-08d5c14056a6 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 May 2018 06:34:01.7235 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0501MB3582 Subject: Re: [dpdk-dev] [PATCH] net/mlx5: fix GRE flow rule 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: , X-List-Received-Date: Thu, 24 May 2018 06:34:07 -0000 Hi Yongseok From: Yongseok Koh > On Wed, May 23, 2018 at 04:45:33AM -0700, Matan Azrad wrote: > > > > Hi Yongseok > > + Steven > > > > From: Yongseok Koh > > > On Tue, May 22, 2018 at 10:36:43PM -0700, Matan Azrad wrote: > > > > Hi Yongseok > > > > > > > > From: Yongseok Koh > > > > > +#ifdef HAVE_IBV_DEVICE_MPLS_SUPPORT > > > > > > > > The GRE item was here even before the MPLSoGRE support > > > > > > Yes, this bug has existed before adding MPLSoGRE support. > > > > > > > so I think that this is not the correct fix and even that it can > > > > hurt the support of GRE for the current customers use it. > > > > > > How can it hurt? Please clarify. > > > > Someone who uses the next flow and have not the new verbs version of MP= LS: > > flow create 0 ingress pattern gre / ipv4 src is X / end actions ... > > ipv4 src or any other inner specifications. > > > > This flow will probably get any supported tunnel packets with inner ipv= 4 src =3D > X. >=20 > Do you think we should compromise?=20 For sure, no, I'm just want the correct fix, like you :)=20 >This is logically wrong for sure. Let me > give you a specific example. >=20 > If I create the following two flows, >=20 > flow create 0 ingress pattern vxlan vni is 10 / end actions queue index= 3 / > mark id 10 / end > flow create 0 ingress pattern vxlan vni is 20 / end actions queue index= 3 / > mark id 20 / end >=20 > The following two packets will match correctly and have flow ID (10 and 2= 0) > according to VNI. >=20 > Ether()/IP()/UDP()/VXLAN(vni=3D10)/Ether()/IPv6() > Ether()/IP()/UDP()/VXLAN(vni=3D20)/Ether()/IPv6() >=20 > However, if three flows are created as follows, >=20 > flow create 0 ingress pattern gre / ipv6 / end actions queue index 3 / = mark id > 2 / end > flow create 0 ingress pattern vxlan vni is 10 / end actions queue index= 3 / > mark id 10 / end > flow create 0 ingress pattern vxlan vni is 20 / end actions queue index= 3 / > mark id 20 / end >=20 > The packets will hit the first flow regardless of VNI and have wrong flow= ID. > That's why I have to drop this specific GRE case. Whoever is using this k= ind of > GRE flow, that's buggy anyway. They have to know it and change it. I have just checked, the next flow under MPLS support doesn't get neither G= RE packet nor non GRE packet: flow create 0 ingress pattern gre / end actions queue index 3 / mark id 2 / end The issue is that in the first implementation of GRE tunnel we didn't force= d L3 next protocol to be GRE in this case because L3 is not in the pattern. > > It may be enough for the current user (which probably use only 1 tunnel= type > at a certain time). >=20 > Router/switch-like applications can have multiple tunnels for sure. I'm n= ot sure > who 'the current user' is but I don't think we can make such an assumptio= n. > I don't want to allow users create faulty flows. I never take such like assumption, just saying...(you can forget it) The point is that we may have a customer which the current behavior of=20 flow create 0 ingress pattern gre / ipv6 .../ end actions queue index 3 / m= ark id 2 / end is good for him and now after this fix it will fail in port creation(low pr= obability). >=20 > > > > Looks like you must specify at least 1 spec in the GRE to apply it > > > > correctly as you did for VXLAN, Can you try empty vxlan and fully > > > > gre (with protocol field)? > > > > > > That's exactly the reason why I'm taking this out. If you look at > > > the code, it doesn't even set any field for GRE if > > > HAVE_IBV_DEVICE_MPLS_SUPPORT isn't supported. Thus, it is considered > > > as a wildcard (all-matching) rule. But if it has > HAVE_IBV_DEVICE_MPLS_SUPPORT, such pattern can be allowed. > > > > Yes, so your GRE flow will not work even if you have MPLS support. >=20 > I'm not sure what you meant but with IBV MPLS support, I think > IBV_FLOW_SPEC_GRE will make things right. Without the support, > IBV_FLOW_SPEC_VXLAN_TUNNEL is even set for GRE flows. >=20 > > I think the issue is generally in all the items: > > You should not configure them if they miss both at least one > > self-specification or item which points to them by "next protocol" fiel= d. > > > > In case of VXLAN tunnels we just don't allow them without > > self-specification, In case of gre we force the next protocol of the pr= evious > item but only when it exists. > > In case of eth(inner),vlan,ipv4,ipv6,udp,tcp we don't force anything. > > > > I think we need a global fix for all, this is probably the root cause. >=20 > Well, the root-cause is that old device/lib doesn't differentiate GRE fro= m VXLAN > when creating flows. OK, let's continue with GRE only and will discuss about other protocol late= r in the next release. I think that the root cause is at least lack of GRE detection by next proto= col field in the outer L3 in case of first GRE item(verbs limitation). We can remove this option at all or to fix it by forcing L3 next protocol = =3D GRE in this case as done when we have L3 item before the GRE. =20