[dpdk-dev] [PATCH v2 0/6] Introduce AF_XDP PMD
Xiaolong Ye
xiaolong.ye at intel.com
Tue Mar 19 08:12:50 CET 2019
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 v5.1-rc1.
- Now i40e and ixgbe drivers have supported zero copy mode.
Change logs
===========
V2:
- Fix a NULL pointer reference crash issue
- Fix txonly stop sending traffic in zc mode
- Refactor rte_mbuf.c to avoid ABI breakage.
- Fix multiple style issues pointed by Ferruh, David, Stephen, Luca.
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 kernel >= v5.1-rc1, 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. ethtool -L enp59s0f0 combined 1
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/
Xiaolong Ye (6):
net/af_xdp: introduce AF XDP PMD driver
lib/mbuf: introduce helper to create mempool with flags
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 +
config/common_linux | 1 +
doc/guides/nics/af_xdp.rst | 45 +
doc/guides/nics/features/af_xdp.ini | 11 +
doc/guides/nics/index.rst | 1 +
doc/guides/rel_notes/release_19_05.rst | 7 +
doc/guides/testpmd_app_ug/run_app.rst | 4 +
drivers/net/Makefile | 1 +
drivers/net/af_xdp/Makefile | 33 +
drivers/net/af_xdp/meson.build | 21 +
drivers/net/af_xdp/rte_eth_af_xdp.c | 1013 +++++++++++++++++
drivers/net/af_xdp/rte_pmd_af_xdp_version.map | 3 +
drivers/net/meson.build | 1 +
lib/librte_mbuf/rte_mbuf.c | 29 +-
lib/librte_mbuf/rte_mbuf.h | 45 +
lib/librte_mempool/rte_mempool.c | 3 +
lib/librte_mempool/rte_mempool.h | 1 +
mk/rte.app.mk | 1 +
22 files changed, 1249 insertions(+), 12 deletions(-)
create mode 100644 doc/guides/nics/af_xdp.rst
create mode 100644 doc/guides/nics/features/af_xdp.ini
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
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