[External] : Re: [PATCH] net/tap: Modified TAP BPF program as per the new Kernel-version upgrade requirements.

[Madhuker Mythri]

By using this " bpf_skb_load_bytes_relative()" helper function we can directly retrieve the Network header data fields, so we no need to check for L2-header VLAN presence.

Thanks,
Madhuker.

-----Original Message-----
From: Stephen Hemminger <stephen at networkplumber.org> 
Sent: 05 January 2024 02:11
To: Madhuker Mythri <madhuker.mythri at oracle.com>
Cc: ferruh.yigit at amd.com; dev at dpdk.org
Subject: [External] : Re: [PATCH] net/tap: Modified TAP BPF program as per the new Kernel-version upgrade requirements.

On Thu,  4 Jan 2024 22:57:56 +0530
madhuker.mythri at oracle.com wrote:

> -	/* Get correct proto for 802.1ad */
> -	if (skb->vlan_present && skb->vlan_proto == htons(ETH_P_8021AD)) {
> -		if (data + ETH_ALEN * 2 + sizeof(struct vlan_hdr) +
> -		    sizeof(proto) > data_end)
> -			return TC_ACT_OK;
> -		proto = *(__u16 *)(data + ETH_ALEN * 2 +
> -				   sizeof(struct vlan_hdr));
> -		off += sizeof(struct vlan_hdr);
> -	}

Your version loses VLAN support?