[dpdk-dev] [PATCH v1 0/6] Introduce AF_XDP PMD

[Xiaolong Ye]

Overview
========

This patchset adds a new PMD driver for AF_XDP which is a proposed
faster version of AF_PACKET interface in Linux, see below links [1] [2] for
details of AF_XDP introduction:

AF_XDP roadmap
==============
- AF_XDP is included in upstream kernel since 4.18, and AF_XDP support
  in libbpf has been merged in bpf-next/master. [3]
- Now i40e and ixgbe drivers have supported zero copy mode.

Change logs
===========

changes vs RFC sent by Qi last Aug:

- Re-work base on AF_XDP's interface changes since the new libbpf has
  provided higher-level APIs that hide many of the details of the AP_XDP
  uapi. After the rework, it helps to reduce 300+ lines of code.

- multi-queues is not supported due to current libbpf doesn't support
  multi-sockets on a single umem.

- No extra steps to load xdp program manually, since the current behavior of
  libbpf would load a default xdp program when user calls xsk_socket__create.
  userspace application only needs to handle the cleanup.

How to try
==========

1. take the latest bpf-next/master, build kernel and replace your host
   kernel with it.
   
   make sure you turn on XDP sockets when compiling

   Networking support -->
        Networking options -->
                [ * ] XDP sockets
   
2. build libbpf in tools/lib/bpf, and copy the libbpf.a and libbpf.so to /usr/lib64

   cd tools/lib/bpf
   make

3. extra steps to build dpdk 

   Add below lines to drivers/net/af_xdp/Makefile 

   CFLAGS += -I/<your linux src root>/tools/include
   CFLAGS += -I/<your linux src root>/tools/lib/bpf

   add below line to config/common_linuxapp to enble the config for af_xdp pmd 

   CONFIG_RTE_LIBRTE_PMD_AF_XDP=y


4. start testpmd

   ./build/app/testpmd -c 0xc -n 4 --vdev eth_af_xdp,iface=enp59s0f0,queue=0 -- -i --rxq=1 --txq=1

    in this case, default xdp program will be loaded and linked to queue 0 of enp59s0f0,
    network traffics travel to queue 0 will be redirected to af_xdp socket.


[1] https://lwn.net/Articles/750845/
[2] https://fosdem.org/2018/schedule/event/af_xdp/
[3] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=143bdc2e27b44d2559596424bfb017d578be33eb

Xiaolong Ye (6):
  net/af_xdp: introduce AF_XDP PMD driver
  lib/mbuf: enable parse flags when create mempool
  lib/mempool: allow page size aligned mempool
  net/af_xdp: use mbuf mempool for buffer management
  net/af_xdp: enable zero copy
  app/testpmd: add mempool flags parameter

 MAINTAINERS                                   |   6 +
 app/test-pmd/parameters.c                     |  12 +
 app/test-pmd/testpmd.c                        |  17 +-
 app/test-pmd/testpmd.h                        |   1 +
 config/common_base                            |   5 +
 doc/guides/nics/af_xdp.rst                    |  43 +
 doc/guides/rel_notes/release_18_11.rst        |   7 +
 drivers/net/Makefile                          |   1 +
 drivers/net/af_xdp/Makefile                   |  31 +
 drivers/net/af_xdp/meson.build                |   7 +
 drivers/net/af_xdp/rte_eth_af_xdp.c           | 988 ++++++++++++++++++
 drivers/net/af_xdp/rte_pmd_af_xdp_version.map |   4 +
 lib/librte_mbuf/rte_mbuf.c                    |  15 +-
 lib/librte_mbuf/rte_mbuf.h                    |   8 +-
 lib/librte_mempool/rte_mempool.c              |   3 +
 lib/librte_mempool/rte_mempool.h              |   1 +
 mk/rte.app.mk                                 |   1 +
 17 files changed, 1139 insertions(+), 11 deletions(-)
 create mode 100644 doc/guides/nics/af_xdp.rst
 create mode 100644 drivers/net/af_xdp/Makefile
 create mode 100644 drivers/net/af_xdp/meson.build
 create mode 100644 drivers/net/af_xdp/rte_eth_af_xdp.c
 create mode 100644 drivers/net/af_xdp/rte_pmd_af_xdp_version.map

-- 
2.17.1