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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21f3687c746sm33583785ad.180.2025.02.07.09.54.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Feb 2025 09:54:09 -0800 (PST) Date: Fri, 7 Feb 2025 09:54:06 -0800 From: Stephen Hemminger <stephen@networkplumber.org> To: "Denis Davidoglu" <denis.davidoglu@b-ulltech.com> Cc: Thomas Monjalon <thomas@monjalon.net>, "dev@dpdk.org" <dev@dpdk.org>, Volkan =?UTF-8?B?QXRsxLE=?= <volkan.atli@b-ulltech.com> Subject: Re: [PATCH] net: support Arista L2 headers Message-ID: <20250207095406.2512f18d@hermes.local> In-Reply-To: <GV1P190MB20415A820BF2090AE8151B2BA1F12@GV1P190MB2041.EURP190.PROD.OUTLOOK.COM> References: <GV1P190MB20413FBFFA4FC719AC6E982EA1F42@GV1P190MB2041.EURP190.PROD.OUTLOOK.COM> <4092617.3daJWjYHZt@thomas> <GV1P190MB20415A820BF2090AE8151B2BA1F12@GV1P190MB2041.EURP190.PROD.OUTLOOK.COM> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org On Fri, 7 Feb 2025 09:07:57 +0000 "Denis Davidoglu" <denis.davidoglu@b-ulltech.com> wrote: > From: Thomas Monjalon <thomas@monjalon.net> > > I'm not familiar with these headers. > > Are they standardized? > > Is there a RFC? =20 >=20 > Arista Vendor Specific Protocol is not publicly disclosed yet. However, W= ireshark already includes a dissector implementetation and its source code = can serve for now as a reference: > https://gitlab.com/wireshark/wireshark/-/blob/master/epan/dissectors/pack= et-avsp.c >=20 > > I'm not sure about adding vendor specific protocols. > > What should be the policy here? =20 >=20 > Given the large number of registered EtherType=E2=84=A2 assignments relat= ed to IEEE 802.3=E2=84=A2 (ISO/IEC 8802-3) standard, supporting vendor-spec= ific protocols should be considered. Though probably not in the way I organ= ized it, mixing RFC-standardized and proprietary protocols in the same file= s. ./lib/net can have a new subdirectory for keeping them separate.=20 >=20 > Arista timestamp is particularly valuable for stock exchanges due to effi= ciency. The timestamp extension is already in use at German Eurex Exchange = and it needs to undergo PoC trials at Borsa =C4=B0stanbul, which utilizes N= asdaq infrastructure. Some parts of it rely on DPDK and this patch will be = especially useful. The rte_net_ptype() is intended to provide a software equivalent for the pa= cket type matching done in many smart NIC's. It is not meant to be a general purpose = L2 packet parser. If a user needs to do this kind of packet processing, it belongs in the app= lication and all the data and metadata is exposed to do this.