This patch set adds AF_XDP selftests based on veth to selftests/bpf.
# Topology:
# ---------
# -----------
# _ | Process | _
# / ----------- \
# / | \
# / | \
# ----------- | -----------
# | Thread1 | | | Thread2 |
# ----------- | -----------
# | | |
# ----------- | -----------
# | xskX | | | xskY |
# ----------- | -----------
# | | |
# ----------- | ----------
# | vethX | --------- | vethY |
# ----------- peer ----------
# | | |
# namespaceX | namespaceY
These selftests test AF_XDP SKB and Native/DRV modes using veth Virtual
Ethernet interfaces.
The test program contains two threads, each thread is single socket with
a unique UMEM. It validates in-order packet delivery and packet content
by sending packets to each other.
Prerequisites setup by script test_xsk.sh:
Set up veth interfaces as per the topology shown ^^:
* setup two veth interfaces and one namespace
** veth<xxxx> in root namespace
** veth<yyyy> in af_xdp<xxxx> namespace
** namespace af_xdp<xxxx>
* create a spec file veth.spec that includes this run-time configuration
*** xxxx and yyyy are randomly generated 4 digit numbers used to avoid
conflict with any existing interface
Adds xsk framework test to validate veth xdp DRV and SKB modes.
The following tests are provided:
1. AF_XDP SKB mode
Generic mode XDP is driver independent, used when the driver does
not have support for XDP. Works on any netdevice using sockets and
generic XDP path. XDP hook from netif_receive_skb().
a. nopoll - soft-irq processing
b. poll - using poll() syscall
c. Socket Teardown
Create a Tx and a Rx socket, Tx from one socket, Rx on another.
Destroy both sockets, then repeat multiple times. Only nopoll mode
is used
d. Bi-directional Sockets
Configure sockets as bi-directional tx/rx sockets, sets up fill
and completion rings on each socket, tx/rx in both directions.
Only nopoll mode is used
2. AF_XDP DRV/Native mode
Works on any netdevice with XDP_REDIRECT support, driver dependent.
Processes packets before SKB allocation. Provides better performance
than SKB. Driver hook available just after DMA of buffer descriptor.
a. nopoll
b. poll
c. Socket Teardown
d. Bi-directional Sockets
* Only copy mode is supported because veth does not currently support
zero-copy mode
Total tests: 8
Flow:
* Single process spawns two threads: Tx and Rx
* Each of these two threads attach to a veth interface within their
assigned namespaces
* Each thread creates one AF_XDP socket connected to a unique umem
for each veth interface
* Tx thread transmits 10k packets from veth<xxxx> to veth<yyyy>
* Rx thread verifies if all 10k packets were received and delivered
in-order, and have the right content
v2 changes:
* Move selftests/xsk to selftests/bpf
* Remove Makefiles under selftests/xsk, and utilize selftests/bpf/Makefile
v3 changes:
* merge all test scripts test_xsk_*.sh into test_xsk.sh
v4 changes:
* merge xsk_env.sh into xsk_prereqs.sh
* test_xsk.sh add cliarg -c for color-coded output
* test_xsk.sh PREREQUISITES disables IPv6 on veth interfaces
* test_xsk.sh PREREQUISITES adds xsk framework test
* test_xsk.sh is independently executable
* xdpxceiver.c Tx/Rx validates only IPv4 packets with TOS 0x9, ignores
others
Structure of the patch set:
Patch 1: Adds XSK selftests framework and test under selftests/bpf
Patch 2: Adds tests: SKB poll and nopoll mode, and mac-ip-udp debug
Patch 3: Adds tests: DRV poll and nopoll mode
Patch 4: Adds tests: SKB and DRV Socket Teardown
Patch 5: Adds tests: SKB and DRV Bi-directional Sockets
Thanks: Weqaar
Weqaar Janjua (5):
selftests/bpf: xsk selftests framework
selftests/bpf: xsk selftests - SKB POLL, NOPOLL
selftests/bpf: xsk selftests - DRV POLL, NOPOLL
selftests/bpf: xsk selftests - Socket Teardown - SKB, DRV
selftests/bpf: xsk selftests - Bi-directional Sockets - SKB, DRV
tools/testing/selftests/bpf/Makefile | 7 +-
tools/testing/selftests/bpf/test_xsk.sh | 259 +++++
tools/testing/selftests/bpf/xdpxceiver.c | 1074 ++++++++++++++++++++
tools/testing/selftests/bpf/xdpxceiver.h | 160 +++
tools/testing/selftests/bpf/xsk_prereqs.sh | 135 +++
5 files changed, 1633 insertions(+), 2 deletions(-)
create mode 100755 tools/testing/selftests/bpf/test_xsk.sh
create mode 100644 tools/testing/selftests/bpf/xdpxceiver.c
create mode 100644 tools/testing/selftests/bpf/xdpxceiver.h
create mode 100755 tools/testing/selftests/bpf/xsk_prereqs.sh
--
2.20.1
