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SubjectRe: [PATCH v6] hv_netvsc: add support for vlans in AF_PACKET mode
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From: Sriram Krishnan <srirakr2@cisco.com>
Date: Wed, 22 Jul 2020 21:08:44 +0530

> Vlan tagged packets are getting dropped when used with DPDK that uses
> the AF_PACKET interface on a hyperV guest.
>
> The packet layer uses the tpacket interface to communicate the vlans
> information to the upper layers. On Rx path, these drivers can read the
> vlan info from the tpacket header but on the Tx path, this information
> is still within the packet frame and requires the paravirtual drivers to
> push this back into the NDIS header which is then used by the host OS to
> form the packet.
>
> This transition from the packet frame to NDIS header is currently missing
> hence causing the host OS to drop the all vlan tagged packets sent by
> the drivers that use AF_PACKET (ETH_P_ALL) such as DPDK.
>
> Here is an overview of the changes in the vlan header in the packet path:
>
> The RX path (userspace handles everything):
> 1. RX VLAN packet is stripped by HOST OS and placed in NDIS header
> 2. Guest Kernel RX hv_netvsc packets and moves VLAN info from NDIS
> header into kernel SKB
> 3. Kernel shares packets with user space application with PACKET_MMAP.
> The SKB VLAN info is copied to tpacket layer and indication set
> TP_STATUS_VLAN_VALID.
> 4. The user space application will re-insert the VLAN info into the frame
>
> The TX path:
> 1. The user space application has the VLAN info in the frame.
> 2. Guest kernel gets packets from the application with PACKET_MMAP.
> 3. The kernel later sends the frame to the hv_netvsc driver. The only way
> to send VLANs is when the SKB is setup & the VLAN is stripped from the
> frame.
> 4. TX VLAN is re-inserted by HOST OS based on the NDIS header. If it sees
> a VLAN in the frame the packet is dropped.
>
> Cc: xe-linux-external@cisco.com
> Cc: Sriram Krishnan <srirakr2@cisco.com>
> Signed-off-by: Sriram Krishnan <srirakr2@cisco.com>

Applied to net-next, thank you.

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