Linux Networking Stack

1. Networking index

   Index of kernel networking documentation.

2. Scaling in the stack

   RSS, RPS, RFS and XPS for spreading packet processing across CPUs.

3. NAPI

   Polling-based interrupt mitigation and busy polling.

4. Network devices and net_device

   net_device lifecycle, ndo operations and device features.

5. IP sysctl

   TCP, UDP and IP tunables under /proc/sys/net.

6. Segmentation offloads

   TSO, GSO, GRO and checksum offload.

7. AF_XDP

   XDP sockets, UMEM and fill and completion rings.

8. Zero-copy sends

   MSG_ZEROCOPY and completion notifications.

9. Timestamping

   SO_TIMESTAMPING software and hardware timestamps.

10. Linux bridge

    Bridge devices, STP and VLAN filtering.

11. Kernel TLS

    In-kernel TLS record encryption and offload.

12. Classic BPF socket filters

    BPF packet filters on sockets and tcpdump.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.