[dpdk-dev] [RFC v2 0/7] PMD driver for AF_XDP

[Qi Zhang]

v2:
- fix lisence header
- clean up bpf dependency, bpf program is embedded,  no "xdpsock_kern.o" required
- clean up make file, only linux_header is required 
- fix all the compile warning.
- fix packet number return in Tx.

The RFC patches add a new PMD driver for AF_XDP which is a proposed
faster version of AF_PACKET interface in Linux, see below link for
detail AF_XDP introduction:
https://fosdem.org/2018/schedule/event/af_xdp/
https://lwn.net/Articles/745934/

This patchset is base on v18.02.
It also require a linux kernel that have below AF_XDP RFC patches be
applied.
https://patchwork.ozlabs.org/patch/867961/
https://patchwork.ozlabs.org/patch/867960/
https://patchwork.ozlabs.org/patch/867938/
https://patchwork.ozlabs.org/patch/867939/
https://patchwork.ozlabs.org/patch/867940/
https://patchwork.ozlabs.org/patch/867941/
https://patchwork.ozlabs.org/patch/867942/
https://patchwork.ozlabs.org/patch/867943/
https://patchwork.ozlabs.org/patch/867944/
https://patchwork.ozlabs.org/patch/867945/
https://patchwork.ozlabs.org/patch/867946/
https://patchwork.ozlabs.org/patch/867947/
https://patchwork.ozlabs.org/patch/867948/
https://patchwork.ozlabs.org/patch/867949/
https://patchwork.ozlabs.org/patch/867950/
https://patchwork.ozlabs.org/patch/867951/
https://patchwork.ozlabs.org/patch/867952/
https://patchwork.ozlabs.org/patch/867953/
https://patchwork.ozlabs.org/patch/867954/
https://patchwork.ozlabs.org/patch/867955/
https://patchwork.ozlabs.org/patch/867956/
https://patchwork.ozlabs.org/patch/867957/
https://patchwork.ozlabs.org/patch/867958/
https://patchwork.ozlabs.org/patch/867959/

There is no clean upstream target yet since kernel patch is still in
RFC stage, The purpose of the patchset is just for anyone that want to
eveluate af_xdp with DPDK application and get feedback for further
improvement.

To try with the new PMD
1. compile and install the kernel with above patches applied. 
   (commit 91e6dd8284256e should work)
2. configure $LINUX_HEADER_DIR (dir of "make headers_install")
   at driver/net/af_xdp/Makefile
3. make sure libelf and libbpf is installed.
4. testpmd cmdline example:
./testpmd -c 0x3 -n 4 --vdev 'eth_af_xdp,iface=eth0' -- -i --mbuf-size=1856 --mp-flags=65

BTW, performance test shows our PMD can reach 94%~98% of the orignal
benchmark when share memory is enabled.

Qi Zhang (7):
  net/af_xdp: new 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 share mempool
  net/af_xdp: load BPF file
  app/testpmd: enable parameter for mempool flags

 app/test-pmd/parameters.c                     |  12 +
 app/test-pmd/testpmd.c                        |  15 +-
 app/test-pmd/testpmd.h                        |   1 +
 config/common_base                            |   5 +
 config/common_linuxapp                        |   1 +
 drivers/net/Makefile                          |   1 +
 drivers/net/af_xdp/Makefile                   |  29 +
 drivers/net/af_xdp/bpf_load.c                 | 168 +++++
 drivers/net/af_xdp/bpf_load.h                 |  11 +
 drivers/net/af_xdp/meson.build                |   7 +
 drivers/net/af_xdp/rte_eth_af_xdp.c           | 909 ++++++++++++++++++++++++++
 drivers/net/af_xdp/rte_pmd_af_xdp_version.map |   4 +
 drivers/net/af_xdp/xdpsock_queue.h            |  66 ++
 lib/librte_mbuf/rte_mbuf.c                    |  15 +-
 lib/librte_mbuf/rte_mbuf.h                    |   8 +-
 lib/librte_mempool/rte_mempool.c              |   2 +
 lib/librte_mempool/rte_mempool.h              |   1 +
 mk/rte.app.mk                                 |   1 +
 18 files changed, 1246 insertions(+), 10 deletions(-)
 create mode 100644 drivers/net/af_xdp/Makefile
 create mode 100644 drivers/net/af_xdp/bpf_load.c
 create mode 100644 drivers/net/af_xdp/bpf_load.h
 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
 create mode 100644 drivers/net/af_xdp/xdpsock_queue.h

-- 
2.13.6