net_core: Decide about l2-processing based on l2_processed-flag

[ClaCodes]

Use the l2_processed-flag to decide whether a network packet needs to be processed by an L2-handler. This could be used in the future to requeue packets for later processing by a different traffic class queue.

Note: this would break all out-of-tree code, that assumed setting reassembled is enough for the packet to be not processed by l2 handlers. Not sure, if this is a valid concern?

Finally goal is to reach something like, so that processing of packets can be deferred easily:

void process_data(struct net_pkt *pkt) {
    // ...
    if (!net_pkt_is_l2_processed(pkt)) {
        process_l2(pkt);
        net_pkt_set_l2_processed(pkt, true);
        bool updated = update_priority(pkt);
        if (updated) {
            net_queue_rx(net_pkt_iface(pkt), pkt);
            return;
        }
    }
    // ...
    if (!net_pkt_is_l3_processed(pkt)) {
        process_l3(pkt);
        net_pkt_set_l3_processed(pkt, true);
        bool updated = update_priority(pkt);
        if (updated) {
            net_queue_rx(net_pkt_iface(pkt), pkt);
            return;
        }
    }
    // ...
    if (!net_pkt_is_l4_processed(pkt)) {
        process_l4(pkt);
        net_pkt_set_l4_processed(pkt, true);
        bool updated = update_priority(pkt);
        if (updated) {
            net_queue_rx(net_pkt_iface(pkt), pkt);
            return;
        }
    }
}

Maybe instead:

    process_ll(pkt);
    process_transport(pkt); // net_ipvX_input
    process_connection(pkt); // net_conn_input

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
4.6% Duplication on New Code

See analysis details on SonarQube Cloud