RE: [PATCH net-next v13 11/11] io_uring/zcrx: add selftest

[lizetao <lizetao1@huawei.com>]

Hi,

> -----Original Message-----
> From: David Wei <dw@davidwei.uk>
> Sent: Thursday, February 13, 2025 2:58 AM
> To: io-uring@vger.kernel.org; netdev@vger.kernel.org
> Cc: Jens Axboe <axboe@kernel.dk>; Pavel Begunkov
> <asml.silence@gmail.com>; Jakub Kicinski <kuba@kernel.org>; Paolo Abeni
> <pabeni@redhat.com>; David S. Miller <davem@davemloft.net>; Eric Dumazet
> <edumazet@google.com>; Jesper Dangaard Brouer <hawk@kernel.org>; David
> Ahern <dsahern@kernel.org>; Mina Almasry <almasrymina@google.com>;
> Stanislav Fomichev <stfomichev@gmail.com>; Joe Damato
> <jdamato@fastly.com>; Pedro Tammela <pctammela@mojatatu.com>
> Subject: [PATCH net-next v13 11/11] io_uring/zcrx: add selftest
> 
> Add a selftest for io_uring zero copy Rx. This test cannot run locally and
> requires a remote host to be configured in net.config. The remote host must
> have hardware support for zero copy Rx as listed in the documentation page.
> The test will restore the NIC config back to before the test and is idempotent.
> 
> liburing is required to compile the test and be installed on the remote host
> running the test.
> 
> Signed-off-by: David Wei <dw@davidwei.uk>
> ---
>  .../selftests/drivers/net/hw/.gitignore       |   2 +
>  .../testing/selftests/drivers/net/hw/Makefile |   5 +
>  .../selftests/drivers/net/hw/iou-zcrx.c       | 426 ++++++++++++++++++
>  .../selftests/drivers/net/hw/iou-zcrx.py      |  64 +++
>  4 files changed, 497 insertions(+)
>  create mode 100644 tools/testing/selftests/drivers/net/hw/iou-zcrx.c
>  create mode 100755 tools/testing/selftests/drivers/net/hw/iou-zcrx.py
> 
> diff --git a/tools/testing/selftests/drivers/net/hw/.gitignore
> b/tools/testing/selftests/drivers/net/hw/.gitignore
> index e9fe6ede681a..6942bf575497 100644
> --- a/tools/testing/selftests/drivers/net/hw/.gitignore
> +++ b/tools/testing/selftests/drivers/net/hw/.gitignore
> @@ -1 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0-only iou-zcrx
>  ncdevmem
> diff --git a/tools/testing/selftests/drivers/net/hw/Makefile
> b/tools/testing/selftests/drivers/net/hw/Makefile
> index 21ba64ce1e34..7efc47c89463 100644
> --- a/tools/testing/selftests/drivers/net/hw/Makefile
> +++ b/tools/testing/selftests/drivers/net/hw/Makefile
> @@ -1,5 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0+ OR MIT
> 
> +TEST_GEN_FILES = iou-zcrx
> +
>  TEST_PROGS = \
>  	csum.py \
>  	devlink_port_split.py \
> @@ -10,6 +12,7 @@ TEST_PROGS = \
>  	ethtool_rmon.sh \
>  	hw_stats_l3.sh \
>  	hw_stats_l3_gre.sh \
> +	iou-zcrx.py \
>  	loopback.sh \
>  	nic_link_layer.py \
>  	nic_performance.py \
> @@ -38,3 +41,5 @@ include ../../../lib.mk  # YNL build  YNL_GENS := ethtool
> netdev  include ../../../net/ynl.mk
> +
> +$(OUTPUT)/iou-zcrx: LDLIBS += -luring
> diff --git a/tools/testing/selftests/drivers/net/hw/iou-zcrx.c
> b/tools/testing/selftests/drivers/net/hw/iou-zcrx.c
> new file mode 100644
> index 000000000000..010c261d2132
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/hw/iou-zcrx.c
> @@ -0,0 +1,426 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <assert.h>
> +#include <errno.h>
> +#include <error.h>
> +#include <fcntl.h>
> +#include <limits.h>
> +#include <stdbool.h>
> +#include <stdint.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +
> +#include <arpa/inet.h>
> +#include <linux/errqueue.h>
> +#include <linux/if_packet.h>
> +#include <linux/ipv6.h>
> +#include <linux/socket.h>
> +#include <linux/sockios.h>
> +#include <net/ethernet.h>
> +#include <net/if.h>
> +#include <netinet/in.h>
> +#include <netinet/ip.h>
> +#include <netinet/ip6.h>
> +#include <netinet/tcp.h>
> +#include <netinet/udp.h>
> +#include <sys/epoll.h>
> +#include <sys/ioctl.h>
> +#include <sys/mman.h>
> +#include <sys/resource.h>
> +#include <sys/socket.h>
> +#include <sys/stat.h>
> +#include <sys/time.h>
> +#include <sys/types.h>
> +#include <sys/un.h>
> +#include <sys/wait.h>
> +

When I compiled this testcase, I got some errors:

  iou-zcrx.c:145:9: error: variable ‘region_reg’ has initializer but incomplete type
  iou-zcrx.c:148:12: error: ‘IORING_MEM_REGION_TYPE_USER’ undeclared (first use in this function)
  ...

It seems that the linux/io_uring.h should be included here.

Also, after include this header file, some errors still exist. 

  iou-zcrx.c:(.text+0x5f0): undefined reference to `io_uring_register_ifq'

It is caused because io_uring_register_ifq symbol was not exported in liburing.

Finally some warnings should also be fixed:

  iou-zcrx.c:288:17: warning: passing argument 2 of ‘bind’ from incompatible pointer type
  iou-zcrx.c:326:18: warning: passing argument 2 of ‘connect’ from incompatible pointer type

> +#include <liburing.h>

---
Li Zetao