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From: Alexander Kozyrev <akozyrev@nvidia.com>
To: Nithin Dabilpuram <nithind1988@gmail.com>
CC: David Marchand <david.marchand@redhat.com>, "dev@dpdk.org" <dev@dpdk.org>,
Dariusz Sosnowski <dsosnowski@nvidia.com>, Ori Kam <orika@nvidia.com>,
"olivier.matz@6wind.com" <olivier.matz@6wind.com>, "NBU-Contact-Thomas
Monjalon (EXTERNAL)" <thomas@monjalon.net>, Matan Azrad <matan@nvidia.com>,
"jerinj@marvell.com" <jerinj@marvell.com>, "rbhansali@marvell.com"
<rbhansali@marvell.com>, "ferruh.yigit@amd.com" <ferruh.yigit@amd.com>
Subject: Re: [PATCH] mbuf: add transport mode ESP packet type
Thread-Topic: [PATCH] mbuf: add transport mode ESP packet type
Thread-Index: AQHa9Kieij4aUQ4NL0mkp3ToPBTvS7KM3lCAgAZCWOaAAQVPgIAChN8w
Date: Thu, 24 Oct 2024 19:30:37 +0000
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>>And we definitely need RTE_PTYPE_INNER_L4_ESP for ESP over UDP support.
>Isn't this already taken care when mbuf->packet_type =3D
>(RTE_PTYPE_L4_UDP | RTE_PTYPE_TUNNEL_ESP) ?
This is ambigous. And both UDP and ESP are L4 headers,
which can lead to the undefined behavior when we specify both of them.
They are mutually exclusive in our hardware, for example.
That is why we have RTE_PTYPE_TUNNEL_MPLS_IN_GRE and
RTE_PTYPE_TUNNEL_MPLS_IN_UDP for MPLS.
We could go and indroduce RTE_PTYPE_TUNNEL_ESP_IN_UDP
to resolve the ambiguity, or have RTE_PTYPE_INNER_L4_ESP.
I choose the second variant to have a generic way for
ESP packets over any type of encapsulation.
--_000_DM4PR12MB75013750F24574ABE3638EC3AF4E2DM4PR12MB7501namp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
>>And we definitely need RTE_PTYPE_INNER_L4_ESP for ESP over UDP supp=
ort.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
>Isn't this already taken care when mbuf->packet_type =3D<br>
>(RTE_PTYPE_L4_UDP | RTE_PTYPE_TUNNEL_ESP) ?<br>
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
This is ambigous. And both UDP and ESP are L4 headers,</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
which can lead to the undefined behavior when we specify both of them.</div=
>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
They are mutually exclusive in our hardware, for example.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
That is why we have RTE_PTYPE_TUNNEL_MPLS_IN_GRE and</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
RTE_PTYPE_TUNNEL_MPLS_IN_UDP for MPLS.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
We could go and indroduce RTE_PTYPE_TUNNEL_ESP_IN_UDP</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
to resolve the ambiguity, or have RTE_PTYPE_INNER_L4_ESP.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
I choose the second variant to have a generic way for </div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
ESP packets over any type of encapsulation.</div>
<div class=3D"elementToProof" style=3D"font-size: 11pt; color: rgb(0, 0, 0)=
;"><br>
</div>
</body>
</html>
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