Re: VLAN filtering in mlx5

[narsimharaj pentam <pnarsimharaj@gmail.com>]

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Thanks  Dariusz Sosnowski.

BR
Narsimha

On Mon, Feb 19, 2024 at 10:20 PM Dariusz Sosnowski <dsosnowski@nvidia.com>
wrote:

> Hi,
>
> I apologize for the very late response.
>
> > From: narsimharaj pentam <pnarsimharaj@gmail.com>
> > Sent: Friday, August 18, 2023 05:34
> > To: users@dpdk.org
> > Subject: VLAN filtering in mlx5
> >
> > Hi
> >
> > We are using a mellanox mlx5 card (firmware version: 16.35.1012) with
> mlx5_pci driver.  Enabled multiple ports  DPDK port 0 (internally referred
> as slot 1 port 0: s1p0)  and DPDK port 1(slot 0 port 0 : s0p0). Multiple
> vlans are created on each of these interfaces , s0p0.100,
> > s0p0.101,s0p0.102  and s0p1.200,s0p1.201,s0p1.202.
> Are these kernel VLAN interfaces?
>
> > In our network we receive broadcast (ARP) and multicast(ICMPV6 for
> neighbour discovery) on port 0 and port 1. At the DPDK application we are
> observing the packets intended for interface s0p0.100 are  landing on other
> vlan interfaces s0p0.101,sop0.102.
> > The VLAN traffic is not segregated accordingly.
> >
> > Do we support VLAN filtering in mlx5 ?
> >
> > Came across VLAN filtering "vlan_filter_set" , will this help to drop
> unintended VLAN traffic ? or  Do we need to create any VLAN specific rte
> flows in addition to the vlan filter set ?
> VLAN filtering is supported by mlx5 PMD.
>
> It's important to note that:
> - VLAN configuration in the kernel is not inherited by the mlx5 PMD.
> - When DPDK application is started on mlx5 devices, application will
> intercept the traffic - unless flow isolation is enabled (
> https://doc.dpdk.org/guides/howto/flow_bifurcation.html).
> - Which packets are intercepted by an application depends on:
>     - Promiscuous mode.
>     - All multicast mode:
>         - If enabled ALL multicast packets from ALL VLANs are received.
>         - If disabled, only broadcast and IPv6 multicast traffic from
> registered VLANs is received.
>     - Registered MAC Addresses - default one and additional registered
> through rte_eth_dev_mac_addr_add()
>     - Registered VLANs - registered through rte_eth_dev_vlan_filter()
> VLAN filtering itself does not require any additional flow rules.
>
> So, if I understand the requirement correctly, then in your case it would
> be required to:
> - Disable promiscuous mode on both ports
> - Disable all multicast mode on both ports
> - On s0p0 explicitly enable VLANs 100, 101 and 102 through
> rte_eth_dev_vlan_filter().
> - On s1p0 explicitly enable VLANs 200, 201 and 202 through
> rte_eth_dev_vlan_filter().
>
> Best regards,
> Dariusz Sosnowski
>

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