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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hey Thomas, In DPDK test cases, I agree that nothing other than Ethernet link types are= currently used. However, when using DPDK Rawdev, the protocol is not usual= ly Ethernet. In my case, I am trying to create PCAP files based on custom P= CI-e traffic. The DPDK pcapng library currently hardcodes the metadata to b= e Ethernet, which cannot be read properly by Wireshark. Allowing the user t= o specify the protocol link type, the user can ensure the pcapng metadata m= atches the traffic data. Dylan ________________________________ From: Thomas Monjalon Sent: Saturday, September 27, 2025 3:28 AM To: Dylan Schneider Cc: dev@dpdk.org ; Reshma Pattan ; J= erin Jacob ; Kiran Kumar K ; N= ithin Dabilpuram ; Zhirun Yan ; Stephen Hemminger Subject: Re: [PATCH v2] pcapng: allow any protocol link type for the interf= ace block WARNING: This email originated from outside of Qualcomm. Please be wary of = any links or attachments, and do not enable macros. 26/09/2025 02:04, Stephen Hemminger: > On Wed, 27 Aug 2025 16:32:15 -0600 > Schneide wrote: > > > > > +* pcapng: Changed the API for adding interfaces to include a link type= argument. > > + The link type was previously hardcoded to the ethernet link type in = the API. > > + This argument is added to ``rte_pcapng_add_interface``. > > + These functions are versioned to retain binary compatibility until t= he next LTS release. > > Since link connector is now merged, and that wording might overlap and > be confusing. Would be could to add reference to pcap-linktype.7 man > page. I'm not sure it overlaps. RTE_ETH_LINK_CONNECTOR is about Ethernet cables while pcap link type will be simply Ethernet type. This being said, I don't understand the immediate benefit of this commit. Why pcap link type would not be always Ethernet in DPDK case? I think the only benefit is for future if other link types are added. Is there something else I'm missing? --_000_IA3PR02MB107715904EC92CDED61931E37E91BAIA3PR02MB10771na_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hey Thomas,
In DPDK test cases, I agree that nothing other than Ethernet link types are= currently used. However, when using DPDK Rawdev, the protocol is not usual= ly Ethernet. In my case, I am trying to create PCAP files based on custom P= CI-e traffic. The DPDK pcapng library currently hardcodes the metadata to be Ethernet, which cannot be read prop= erly by Wireshark. Allowing the user to specify the protocol link type, the= user can ensure the pcapng metadata matches the traffic data.
Dylan
From: Thomas Monjalon <t= homas@monjalon.net>
Sent: Saturday, September 27, 2025 3:28 AM
To: Dylan Schneider <schneide@qti.qualcomm.com>
Cc: dev@dpdk.org <dev@dpdk.org>; Reshma Pattan <reshma.patt= an@intel.com>; Jerin Jacob <jerinj@marvell.com>; Kiran Kumar K <= ;kirankumark@marvell.com>; Nithin Dabilpuram <ndabilpuram@marvell.com= >; Zhirun Yan <yanzhirun_163@163.com>; Stephen Hemminger <steph= en@networkplumber.org>
Subject: Re: [PATCH v2] pcapng: allow any protocol link type for the= interface block
 
WARNING: This email originated from outside of Qua= lcomm. Please be wary of any links or attachments, and do not enable macros= .

26/09/2025 02:04, Stephen Hemminger:
> On Wed, 27 Aug 2025 16:32:15 -0600
> Schneide <schneide@qti.qualcomm.com> wrote:
>
> >
> > +* pcapng: Changed the API for adding interfaces to include a lin= k type argument.
> > +  The link type was previously hardcoded to the ethernet li= nk type in the API.
> > +  This argument is added to ``rte_pcapng_add_interface``. > > +  These functions are versioned to retain binary compatibil= ity until the next LTS release.
>
> Since link connector is now merged, and that wording might overlap and=
> be confusing. Would be could to add reference to pcap-linktype.7 man > page.

I'm not sure it overlaps.
RTE_ETH_LINK_CONNECTOR is about Ethernet cables while
pcap link type will be simply Ethernet type.

This being said, I don't understand the immediate benefit of this commit. Why pcap link type would not be always Ethernet in DPDK case?
I think the only benefit is for future if other link types are added.
Is there something else I'm missing?


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