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Miller" , Eric Dumazet , Paolo Abeni , Shuah Khan , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , linux-kernel@vger.kernel.org (open list), linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK), bpf@vger.kernel.org (open list:XDP (eXpress Data Path):Keyword:(?:\b|_)xdp(?:\b|_)) Subject: [PATCH net-next RESEND v7 3/3] selftests: drv-net: Test queue xsk attribute Date: Thu, 13 Feb 2025 19:23:13 +0000 Message-ID: <20250213192336.42156-4-jdamato@fastly.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250213192336.42156-1-jdamato@fastly.com> References: <20250213192336.42156-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Test that queues which are used for AF_XDP have the xsk nest attribute. The attribute is currently empty, but its existence means the AF_XDP is being used for the queue. Enable CONFIG_XDP_SOCKETS for selftests/drivers/net tests, as well. Signed-off-by: Joe Damato Suggested-by: Jakub Kicinski --- .../testing/selftests/drivers/net/.gitignore | 2 + tools/testing/selftests/drivers/net/Makefile | 3 + tools/testing/selftests/drivers/net/config | 1 + tools/testing/selftests/drivers/net/queues.py | 42 +++++++- .../selftests/drivers/net/xdp_helper.c | 98 +++++++++++++++++++ 5 files changed, 143 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/drivers/net/.gitignore create mode 100644 tools/testing/selftests/drivers/net/xdp_helper.c diff --git a/tools/testing/selftests/drivers/net/.gitignore b/tools/testing= /selftests/drivers/net/.gitignore new file mode 100644 index 000000000000..ec746f374e85 --- /dev/null +++ b/tools/testing/selftests/drivers/net/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +xdp_helper diff --git a/tools/testing/selftests/drivers/net/Makefile b/tools/testing/s= elftests/drivers/net/Makefile index 28b6d47f812d..68127c449c24 100644 --- a/tools/testing/selftests/drivers/net/Makefile +++ b/tools/testing/selftests/drivers/net/Makefile @@ -1,10 +1,13 @@ # SPDX-License-Identifier: GPL-2.0 +CFLAGS +=3D $(KHDR_INCLUDES) =20 TEST_INCLUDES :=3D $(wildcard lib/py/*.py) \ $(wildcard lib/sh/*.sh) \ ../../net/net_helper.sh \ ../../net/lib.sh \ =20 +TEST_GEN_PROGS :=3D xdp_helper + TEST_PROGS :=3D \ netcons_basic.sh \ netcons_fragmented_msg.sh \ diff --git a/tools/testing/selftests/drivers/net/config b/tools/testing/sel= ftests/drivers/net/config index a2d8af60876d..f27172ddee0a 100644 --- a/tools/testing/selftests/drivers/net/config +++ b/tools/testing/selftests/drivers/net/config @@ -4,3 +4,4 @@ CONFIG_CONFIGFS_FS=3Dy CONFIG_NETCONSOLE=3Dm CONFIG_NETCONSOLE_DYNAMIC=3Dy CONFIG_NETCONSOLE_EXTENDED_LOG=3Dy +CONFIG_XDP_SOCKETS=3Dy diff --git a/tools/testing/selftests/drivers/net/queues.py b/tools/testing/= selftests/drivers/net/queues.py index 38303da957ee..5fdfebc6415f 100755 --- a/tools/testing/selftests/drivers/net/queues.py +++ b/tools/testing/selftests/drivers/net/queues.py @@ -2,13 +2,16 @@ # SPDX-License-Identifier: GPL-2.0 =20 from lib.py import ksft_disruptive, ksft_exit, ksft_run -from lib.py import ksft_eq, ksft_raises, KsftSkipEx +from lib.py import ksft_eq, ksft_raises, KsftSkipEx, KsftFailEx from lib.py import EthtoolFamily, NetdevFamily, NlError from lib.py import NetDrvEnv from lib.py import cmd, defer, ip import errno import glob - +import os +import socket +import struct +import subprocess =20 def sys_get_queues(ifname, qtype=3D'rx') -> int: folders =3D glob.glob(f'/sys/class/net/{ifname}/queues/{qtype}-*') @@ -21,6 +24,39 @@ def nl_get_queues(cfg, nl, qtype=3D'rx'): return len([q for q in queues if q['type'] =3D=3D qtype]) return None =20 +def check_xdp(cfg, nl, xdp_queue_id=3D0) -> None: + test_dir =3D os.path.dirname(os.path.realpath(__file__)) + xdp =3D subprocess.Popen([f"{test_dir}/xdp_helper", f"{cfg.ifindex}", = f"{xdp_queue_id}"], + stdin=3Dsubprocess.PIPE, stdout=3Dsubprocess.PI= PE, bufsize=3D1, + text=3DTrue) + defer(xdp.kill) + + stdout, stderr =3D xdp.communicate(timeout=3D10) + rx =3D tx =3D False + + if xdp.returncode =3D=3D 255: + raise KsftSkipEx('AF_XDP unsupported') + elif xdp.returncode > 0: + raise KsftFailEx('unable to create AF_XDP socket') + + queues =3D nl.queue_get({'ifindex': cfg.ifindex}, dump=3DTrue) + if not queues: + raise KsftSkipEx("Netlink reports no queues") + + for q in queues: + if q['id'] =3D=3D 0: + if q['type'] =3D=3D 'rx': + rx =3D True + if q['type'] =3D=3D 'tx': + tx =3D True + + ksft_eq(q['xsk'], {}) + else: + if 'xsk' in q: + _fail("Check failed: xsk attribute set.") + + ksft_eq(rx, True) + ksft_eq(tx, True) =20 def get_queues(cfg, nl) -> None: snl =3D NetdevFamily(recv_size=3D4096) @@ -81,7 +117,7 @@ def check_down(cfg, nl) -> None: =20 def main() -> None: with NetDrvEnv(__file__, queue_count=3D100) as cfg: - ksft_run([get_queues, addremove_queues, check_down], args=3D(cfg, = NetdevFamily())) + ksft_run([get_queues, addremove_queues, check_down, check_xdp], ar= gs=3D(cfg, NetdevFamily())) ksft_exit() =20 =20 diff --git a/tools/testing/selftests/drivers/net/xdp_helper.c b/tools/testi= ng/selftests/drivers/net/xdp_helper.c new file mode 100644 index 000000000000..2a40cc35d800 --- /dev/null +++ b/tools/testing/selftests/drivers/net/xdp_helper.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define UMEM_SZ (1U << 16) +#define NUM_DESC (UMEM_SZ / 2048) + +/* this is a simple helper program that creates an XDP socket and does the + * minimum necessary to get bind() to succeed. + * + * this test program is not intended to actually process packets, but coul= d be + * extended in the future if that is actually needed. + * + * it is used by queues.py to ensure the xsk netlinux attribute is set + * correctly. + */ +int main(int argc, char **argv) +{ + struct xdp_umem_reg umem_reg =3D { 0 }; + struct sockaddr_xdp sxdp =3D { 0 }; + int num_desc =3D NUM_DESC; + void *umem_area; + int ifindex; + int sock_fd; + int queue; + char byte; + + if (argc !=3D 3) { + fprintf(stderr, "Usage: %s ifindex queue_id", argv[0]); + return 1; + } + + sock_fd =3D socket(AF_XDP, SOCK_RAW, 0); + if (sock_fd < 0) { + perror("socket creation failed"); + /* if the kernel doesnt support AF_XDP, let the test program + * know with -1. All other error paths return 1. + */ + if (errno =3D=3D EAFNOSUPPORT) + return -1; + return 1; + } + + ifindex =3D atoi(argv[1]); + queue =3D atoi(argv[2]); + + umem_area =3D mmap(NULL, UMEM_SZ, PROT_READ | PROT_WRITE, MAP_PRIVATE | + MAP_ANONYMOUS, -1, 0); + if (umem_area =3D=3D MAP_FAILED) { + perror("mmap failed"); + return 1; + } + + umem_reg.addr =3D (uintptr_t)umem_area; + umem_reg.len =3D UMEM_SZ; + umem_reg.chunk_size =3D 2048; + umem_reg.headroom =3D 0; + + setsockopt(sock_fd, SOL_XDP, XDP_UMEM_REG, &umem_reg, + sizeof(umem_reg)); + setsockopt(sock_fd, SOL_XDP, XDP_UMEM_FILL_RING, &num_desc, + sizeof(num_desc)); + setsockopt(sock_fd, SOL_XDP, XDP_UMEM_COMPLETION_RING, &num_desc, + sizeof(num_desc)); + setsockopt(sock_fd, SOL_XDP, XDP_RX_RING, &num_desc, sizeof(num_desc)); + + sxdp.sxdp_family =3D AF_XDP; + sxdp.sxdp_ifindex =3D ifindex; + sxdp.sxdp_queue_id =3D queue; + sxdp.sxdp_flags =3D 0; + + if (bind(sock_fd, (struct sockaddr *)&sxdp, sizeof(sxdp)) !=3D 0) { + munmap(umem_area, UMEM_SZ); + perror("bind failed"); + close(sock_fd); + return 1; + } + + /* give the parent program some data when the socket is ready*/ + fprintf(stdout, "%d\n", sock_fd); + + /* parent program will write a byte to stdin when its ready for this + * helper to exit + */ + read(STDIN_FILENO, &byte, 1); + + close(sock_fd); + return 0; +} --=20 2.43.0