netdev - Network RX per process per interface statistics

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Date:   Fri, 24 Mar 2023 19:29:15 +0300
From:   Kamil Zaripov <zaripov-kamil@...ide.ai>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Network RX per process per interface statistics 

Hi everyone,

I trying to make a BPF program that can collect per process per interface statistics of network data consumption. Right now most difficult part for me is RX traffic.

I have tried to find some point in the sk_buff's way up to network stack where I can extract info both about the network interface which captured package and the process that will consume this data but failed. So I have to listen events in several points and somehow merge collected data.

The last point I found at which sk_buff still contains information about network device that captured this sk_buff is netif_receive_skb tracepoint. The first point where I can found information about process is protocol's rcv handlers (like tcp_v4_do_rcv). But I have some questions, to finish my program:

1. It seems that sk_buff modifies during handling, so how can I "match" sk_buff with same data in netif_receive_skb and in tcp_v4_do_rcv?
2. Maybe there is some good point where I can attach listener and where I can extract both process and interface info for each package?

Regards
Zaripov Kamil.