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Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Andrew Lunn , Xuan Zhuo , Mina Almasry , Martin Karsten , Amritha Nambiar , Stanislav Fomichev , Daniel Jurgens , linux-kernel@vger.kernel.org (open list) Subject: [RFC net-next 1/2] netdev-genl: Add an XSK attribute to queues Date: Wed, 29 Jan 2025 17:24:24 +0000 Message-Id: <20250129172431.65773-2-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250129172431.65773-1-jdamato@fastly.com> References: <20250129172431.65773-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Expose a new per-queue attribute, xsk, which indicates that a queue is being used for AF_XDP. Update the documentation to more explicitly state which queue types are linked. Signed-off-by: Joe Damato --- Documentation/netlink/specs/netdev.yaml | 10 +++++++++- include/uapi/linux/netdev.h | 1 + net/core/netdev-genl.c | 6 ++++++ tools/include/uapi/linux/netdev.h | 1 + 4 files changed, 17 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml index cbb544bd6c84..7a72788cce03 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -286,6 +286,8 @@ attribute-sets: - name: type doc: Queue type as rx, tx. Each queue type defines a separate ID space. + XDP TX queues allocated in the kernel are not linked to NAPIs and + thus not listed. AF_XDP queues have the xsk attribute set. type: u32 enum: queue-type - @@ -296,7 +298,12 @@ attribute-sets: name: dmabuf doc: ID of the dmabuf attached to this queue, if any. type: u32 - + - + name: xsk + doc: Non-zero for queues which are used for XSK (AF_XDP), 0 otherwise. + type: u32 + checks: + max: 1 - name: qstats doc: | @@ -637,6 +644,7 @@ operations: - napi-id - ifindex - dmabuf + - xsk dump: request: attributes: diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index e4be227d3ad6..4d2dcf4960ec 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -136,6 +136,7 @@ enum { NETDEV_A_QUEUE_TYPE, NETDEV_A_QUEUE_NAPI_ID, NETDEV_A_QUEUE_DMABUF, + NETDEV_A_QUEUE_XSK, __NETDEV_A_QUEUE_MAX, NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1) diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 715f85c6b62e..964aebfcb079 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -394,12 +394,18 @@ netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev, nla_put_u32(rsp, NETDEV_A_QUEUE_DMABUF, binding->id)) goto nla_put_failure; + if (nla_put_u32(rsp, NETDEV_A_QUEUE_XSK, !!rxq->pool)) + goto nla_put_failure; + break; case NETDEV_QUEUE_TYPE_TX: txq = netdev_get_tx_queue(netdev, q_idx); if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID, txq->napi->napi_id)) goto nla_put_failure; + + if (nla_put_u32(rsp, NETDEV_A_QUEUE_XSK, !!txq->pool)) + goto nla_put_failure; } genlmsg_end(rsp, hdr); diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h index e4be227d3ad6..4d2dcf4960ec 100644 --- a/tools/include/uapi/linux/netdev.h +++ b/tools/include/uapi/linux/netdev.h @@ -136,6 +136,7 @@ enum { NETDEV_A_QUEUE_TYPE, NETDEV_A_QUEUE_NAPI_ID, NETDEV_A_QUEUE_DMABUF, + NETDEV_A_QUEUE_XSK, __NETDEV_A_QUEUE_MAX, NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1) From patchwork Wed Jan 29 17:24:25 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joe Damato X-Patchwork-Id: 13954008 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 716791E32A0 for ; 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Wed, 29 Jan 2025 09:24:51 -0800 (PST) Received: from localhost.localdomain ([2620:11a:c019:0:65e:3115:2f58:c5fd]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21da4bc5c1fsm101147295ad.82.2025.01.29.09.24.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2025 09:24:51 -0800 (PST) From: Joe Damato To: netdev@vger.kernel.org Cc: sridhar.samudrala@intel.com, Joe Damato , Shuah Khan , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , 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: [RFC net-next 2/2] selftests: drv-net: Test queue xsk attribute Date: Wed, 29 Jan 2025 17:24:25 +0000 Message-Id: <20250129172431.65773-3-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250129172431.65773-1-jdamato@fastly.com> References: <20250129172431.65773-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Test that queues which are used for AF_XDP have the xsk attribute set. Signed-off-by: Joe Damato --- tools/testing/selftests/drivers/.gitignore | 1 + tools/testing/selftests/drivers/net/Makefile | 3 + tools/testing/selftests/drivers/net/queues.py | 32 ++++++- .../selftests/drivers/net/xdp_helper.c | 90 +++++++++++++++++++ 4 files changed, 124 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/drivers/net/xdp_helper.c diff --git a/tools/testing/selftests/drivers/.gitignore b/tools/testing/selftests/drivers/.gitignore index 09e23b5afa96..3c109144f7ff 100644 --- a/tools/testing/selftests/drivers/.gitignore +++ b/tools/testing/selftests/drivers/.gitignore @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only /dma-buf/udmabuf /s390x/uvdevice/test_uvdevice +/net/xdp_helper diff --git a/tools/testing/selftests/drivers/net/Makefile b/tools/testing/selftests/drivers/net/Makefile index 137470bdee0c..f6ec08680f48 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 += $(KHDR_INCLUDES) TEST_INCLUDES := $(wildcard lib/py/*.py) \ $(wildcard lib/sh/*.sh) \ ../../net/net_helper.sh \ ../../net/lib.sh \ +TEST_GEN_PROGS := xdp_helper + TEST_PROGS := \ netcons_basic.sh \ netcons_overflow.sh \ diff --git a/tools/testing/selftests/drivers/net/queues.py b/tools/testing/selftests/drivers/net/queues.py index 38303da957ee..4bd4710b1a79 100755 --- a/tools/testing/selftests/drivers/net/queues.py +++ b/tools/testing/selftests/drivers/net/queues.py @@ -8,7 +8,10 @@ from lib.py import NetDrvEnv from lib.py import cmd, defer, ip import errno import glob - +import os +import socket +import struct +import subprocess def sys_get_queues(ifname, qtype='rx') -> int: folders = glob.glob(f'/sys/class/net/{ifname}/queues/{qtype}-*') @@ -21,6 +24,31 @@ def nl_get_queues(cfg, nl, qtype='rx'): return len([q for q in queues if q['type'] == qtype]) return None +def check_xdp(cfg, nl, xdp_queue_id=0) -> None: + test_dir = os.path.dirname(os.path.realpath(__file__)) + xdp = subprocess.Popen([f"{test_dir}/xdp_helper", f"{cfg.ifindex}", f"{xdp_queue_id}"], + stdin=subprocess.PIPE, stdout=subprocess.PIPE, bufsize=1, + text=True) + + stdout, stderr = xdp.communicate(timeout=10) + rx = tx = False + + queues = nl.queue_get({'ifindex': cfg.ifindex}, dump=True) + if queues: + for q in queues: + if q['id'] == 0: + if q['type'] == 'rx': + rx = True + if q['type'] == 'tx': + tx = True + + ksft_eq(q['xsk'], 1) + else: + ksft_eq(q['xsk'], 0) + + ksft_eq(rx, True) + ksft_eq(tx, True) + xdp.kill() def get_queues(cfg, nl) -> None: snl = NetdevFamily(recv_size=4096) @@ -81,7 +109,7 @@ def check_down(cfg, nl) -> None: def main() -> None: with NetDrvEnv(__file__, queue_count=100) as cfg: - ksft_run([get_queues, addremove_queues, check_down], args=(cfg, NetdevFamily())) + ksft_run([get_queues, addremove_queues, check_down, check_xdp], args=(cfg, NetdevFamily())) ksft_exit() diff --git a/tools/testing/selftests/drivers/net/xdp_helper.c b/tools/testing/selftests/drivers/net/xdp_helper.c new file mode 100644 index 000000000000..8ed5f0e7233e --- /dev/null +++ b/tools/testing/selftests/drivers/net/xdp_helper.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +#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 could 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 = { 0 }; + struct sockaddr_xdp sxdp = { 0 }; + int num_desc = NUM_DESC; + void *umem_area; + int ifindex; + int sock_fd; + int queue; + char byte; + + if (argc != 3) { + fprintf(stderr, "Usage: %s ifindex queue_id", argv[0]); + return 1; + } + + sock_fd = socket(AF_XDP, SOCK_RAW, 0); + if (sock_fd < 0) { + perror("socket creation failed"); + return 1; + } + + ifindex = atoi(argv[1]); + queue = atoi(argv[2]); + + umem_area = mmap(NULL, UMEM_SZ, PROT_READ | PROT_WRITE, MAP_PRIVATE | + MAP_ANONYMOUS, -1, 0); + if (umem_area == MAP_FAILED) + return -1; + + umem_reg.addr = (uintptr_t)umem_area; + umem_reg.len = UMEM_SZ; + umem_reg.chunk_size = 2048; + umem_reg.headroom = 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 = AF_XDP; + sxdp.sxdp_ifindex = ifindex; + sxdp.sxdp_queue_id = queue; + sxdp.sxdp_flags = 0; + + if (bind(sock_fd, (struct sockaddr *)&sxdp, sizeof(sxdp)) != 0) { + 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; +}