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b07fa341cf
This updates our eBPF module to use DRV_MODE for less CPU overhead and better performance for all same-stack TURN relaying. Notably, gVNIC does not seem to support the `bpf_xdp_adjust_head` helper, so unfortunately we need to extend / shrink the packet tail and move the payload instead. Comprehensive benchmarks have not been performed, but early results show that we can saturate about 1 Gbps per E2 core on GCP: ``` [SUM] 0.00-30.04 sec 3.16 GBytes 904 Mbits/sec 12088 sender [SUM] 0.00-30.00 sec 3.12 GBytes 894 Mbits/sec receiver ``` This is with 64 TCP streams. More streams will better utilize all available RX queues, and lead to better performance. Related: #10138 Fixes: #8633