Hi! The purpose of this series is to add a software model of BPF offloads to make it easier for everyone to test them and make some of the more arcane rules and assumptions more clear.
The series starts with 3 patches aiming to make XDP handling in the drivers less error prone. Currently driver authors have to remember to free XDP programs if XDP is active during unregister. With this series the core will disable XDP on its own. It will take place after close, drivers are not expected to perform reconfiguration when disabling XDP on a downed device. Next two patches add the software netdev driver, followed by a python test which exercises all the corner cases which came to my mind. Test needs to be run as root. It will print basic information to stdout, but can also create a more detailed log of all commands when --log option is passed. Log is in Emacs Org-mode format. ./tools/testing/selftests/bpf/test_offload.py --log /tmp/log Last two patches replace the SR-IOV API implementation of dummy. v2: - free device from the release function; - use bus-based name generatin instead of netdev name. v1: - replace the SR-IOV API implementation of dummy; - make the dev_xdp_uninstall() also handle the XDP generic (Daniel). Jakub Kicinski (8): net: xdp: avoid output parameters when querying XDP prog net: xdp: report flags program was installed with on query net: xdp: make the stack take care of the tear down netdevsim: add software driver for testing offloads netdevsim: add bpf offload support selftests/bpf: add offload test based on netdevsim netdevsim: add SR-IOV functionality net: dummy: remove fake SR-IOV functionality MAINTAINERS | 5 + drivers/net/Kconfig | 11 + drivers/net/Makefile | 1 + drivers/net/dummy.c | 215 +------ drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 - drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 - drivers/net/ethernet/netronome/nfp/bpf/main.c | 7 - .../net/ethernet/netronome/nfp/nfp_net_common.c | 4 +- drivers/net/ethernet/qlogic/qede/qede_main.c | 4 - drivers/net/netdevsim/Makefile | 7 + drivers/net/netdevsim/bpf.c | 373 +++++++++++ drivers/net/netdevsim/netdev.c | 501 +++++++++++++++ drivers/net/netdevsim/netdevsim.h | 78 +++ drivers/net/tun.c | 4 - include/linux/netdevice.h | 5 +- net/core/dev.c | 53 +- net/core/rtnetlink.c | 6 +- tools/testing/selftests/bpf/Makefile | 5 +- tools/testing/selftests/bpf/sample_ret0.c | 7 + tools/testing/selftests/bpf/test_offload.py | 681 +++++++++++++++++++++ 20 files changed, 1714 insertions(+), 258 deletions(-) create mode 100644 drivers/net/netdevsim/Makefile create mode 100644 drivers/net/netdevsim/bpf.c create mode 100644 drivers/net/netdevsim/netdev.c create mode 100644 drivers/net/netdevsim/netdevsim.h create mode 100644 tools/testing/selftests/bpf/sample_ret0.c create mode 100755 tools/testing/selftests/bpf/test_offload.py -- 2.14.1
