From: Balbir Singh <balbirs@nvidia.com>
To: Yiyang Chen <cyyzero16@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] selftests/acct: share netlink helpers
Date: Mon, 13 Jul 2026 12:34:21 +1000 [thread overview]
Message-ID: <alROfVAIKy5WnHAI@parvat> (raw)
In-Reply-To: <a2adf27308b5cd90d50b59e8519b87da49486bee.1783876192.git.cyyzero16@gmail.com>
On Mon, Jul 13, 2026 at 01:13:31AM +0800, Yiyang Chen wrote:
> Extract the duplicated generic netlink boilerplate (netlink_open,
> send_request, get_family_id, and NLA walker macros) from
> cgroupstats.c and taskstats_fill_stats_tgid.c into a shared
> netlink_helper.{h,c}.
>
> Suggested-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Yiyang Chen <cyyzero16@gmail.com>
> ---
> tools/testing/selftests/acct/.gitignore | 1 +
> tools/testing/selftests/acct/Makefile | 10 ++
> tools/testing/selftests/acct/cgroupstats.c | 133 +----------------
> tools/testing/selftests/acct/netlink_helper.c | 116 +++++++++++++++
> tools/testing/selftests/acct/netlink_helper.h | 44 ++++++
> .../acct/taskstats_fill_stats_tgid.c | 134 ++----------------
> 6 files changed, 184 insertions(+), 254 deletions(-)
> create mode 100644 tools/testing/selftests/acct/netlink_helper.c
> create mode 100644 tools/testing/selftests/acct/netlink_helper.h
>
> diff --git a/tools/testing/selftests/acct/.gitignore b/tools/testing/selftests/acct/.gitignore
> index 9e9c61c5bfd6..fe0896f54e15 100644
> --- a/tools/testing/selftests/acct/.gitignore
> +++ b/tools/testing/selftests/acct/.gitignore
> @@ -1,4 +1,5 @@
> acct_syscall
> taskstats_fill_stats_tgid
> +cgroupstats
> config
> process_log
> diff --git a/tools/testing/selftests/acct/Makefile b/tools/testing/selftests/acct/Makefile
> index db88d65f5581..93a11a28a636 100644
> --- a/tools/testing/selftests/acct/Makefile
> +++ b/tools/testing/selftests/acct/Makefile
> @@ -3,7 +3,17 @@ TEST_GEN_PROGS := acct_syscall
> TEST_GEN_PROGS += taskstats_fill_stats_tgid
> TEST_GEN_PROGS += cgroupstats
>
> +NETLINK_HELPER_PROGS := cgroupstats taskstats_fill_stats_tgid
> +
> CFLAGS += -Wall
> LDLIBS += -lpthread
>
> include ../lib.mk
> +
> +$(NETLINK_HELPER_PROGS): %: %.c netlink_helper.c netlink_helper.h
> + $(call msg,CC,,$@)
> + $(Q)$(LINK.c) $< netlink_helper.c $(LDLIBS) -o $@
> +
> +$(addprefix $(OUTPUT)/,$(NETLINK_HELPER_PROGS)): $(OUTPUT)/%: %.c netlink_helper.c netlink_helper.h
> + $(call msg,CC,,$@)
> + $(Q)$(LINK.c) $< netlink_helper.c $(LDLIBS) -o $@
> diff --git a/tools/testing/selftests/acct/cgroupstats.c b/tools/testing/selftests/acct/cgroupstats.c
> index e2836383ed50..0b421a4ca72b 100644
> --- a/tools/testing/selftests/acct/cgroupstats.c
> +++ b/tools/testing/selftests/acct/cgroupstats.c
> @@ -6,139 +6,19 @@
> #include <linux/cgroupstats.h>
> #include <linux/genetlink.h>
> #include <linux/netlink.h>
> +#include <stdbool.h>
> #include <stdint.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> +#include <sys/mount.h>
> #include <sys/socket.h>
> #include <sys/types.h>
> -#include <sys/mount.h>
> -#include <time.h>
> #include <unistd.h>
>
> +#include "netlink_helper.h"
> #include "kselftest.h"
>
> -#ifndef NLA_ALIGN
> -#define NLA_ALIGNTO 4
> -#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
> -#define NLA_HDRLEN ((int)NLA_ALIGN(sizeof(struct nlattr)))
> -#endif
> -
> -#define RECV_TIMEOUT_SEC 2
> -
> -static void *nla_data(const struct nlattr *na)
> -{
> - return (void *)((char *)na + NLA_HDRLEN);
> -}
> -
> -static int netlink_open(void)
> -{
> - struct timeval tv = { .tv_sec = RECV_TIMEOUT_SEC };
> - struct sockaddr_nl addr = {
> - .nl_family = AF_NETLINK,
> - .nl_pid = getpid(),
> - };
> - int fd;
> -
> - fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
> - if (fd < 0)
> - return -errno;
> -
> - /*
> - * Ensure that a missing kernel reply fails the individual test
> - * case instead of hanging the whole test binary.
> - */
> - if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
> - int err = -errno;
> -
> - close(fd);
> - return err;
> - }
> -
> - if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
> - int err = -errno;
> -
> - close(fd);
> - return err;
> - }
> -
> - return fd;
> -}
> -
> -static int send_request(int fd, void *buf, size_t len)
> -{
> - struct sockaddr_nl addr = {
> - .nl_family = AF_NETLINK,
> - };
> -
> - if (sendto(fd, buf, len, 0, (struct sockaddr *)&addr, sizeof(addr)) < 0)
> - return -errno;
> -
> - return 0;
> -}
> -
> -static int get_family_id(int fd, const char *name)
> -{
> - struct {
> - struct nlmsghdr nlh;
> - struct genlmsghdr genl;
> - char buf[256];
> - } req = { 0 };
> - char resp[8192];
> - struct nlmsghdr *nlh;
> - struct genlmsghdr *genl;
> - struct nlattr *na;
> - int len;
> - int rem;
> - int ret;
> -
> - req.nlh.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
> - req.nlh.nlmsg_type = GENL_ID_CTRL;
> - req.nlh.nlmsg_flags = NLM_F_REQUEST;
> - req.nlh.nlmsg_seq = 1;
> - req.nlh.nlmsg_pid = getpid();
> -
> - req.genl.cmd = CTRL_CMD_GETFAMILY;
> - req.genl.version = 1;
> -
> - na = (struct nlattr *)((char *)&req + NLMSG_ALIGN(req.nlh.nlmsg_len));
> - na->nla_type = CTRL_ATTR_FAMILY_NAME;
> - na->nla_len = NLA_HDRLEN + strlen(name) + 1;
> - memcpy(nla_data(na), name, strlen(name) + 1);
> - req.nlh.nlmsg_len = NLMSG_ALIGN(req.nlh.nlmsg_len) + NLA_ALIGN(na->nla_len);
> -
> - ret = send_request(fd, &req, req.nlh.nlmsg_len);
> - if (ret)
> - return ret;
> -
> - len = recv(fd, resp, sizeof(resp), 0);
> - if (len < 0)
> - return -errno;
> -
> - for (nlh = (struct nlmsghdr *)resp; NLMSG_OK(nlh, len);
> - nlh = NLMSG_NEXT(nlh, len)) {
> - if (nlh->nlmsg_type == NLMSG_ERROR) {
> - struct nlmsgerr *err = NLMSG_DATA(nlh);
> -
> - return err->error ? err->error : -ENOENT;
> - }
> -
> - genl = (struct genlmsghdr *)NLMSG_DATA(nlh);
> - rem = nlh->nlmsg_len - NLMSG_HDRLEN - GENL_HDRLEN;
> - na = (struct nlattr *)((char *)genl + GENL_HDRLEN);
> - while (rem >= (int)sizeof(*na) &&
> - na->nla_len >= (int)sizeof(*na) &&
> - na->nla_len <= rem) {
> - if (na->nla_type == CTRL_ATTR_FAMILY_ID)
> - return *(uint16_t *)nla_data(na);
> - rem -= NLA_ALIGN(na->nla_len);
> - na = (struct nlattr *)((char *)na + NLA_ALIGN(na->nla_len));
> - }
> - }
> -
> - return -ENOENT;
> -}
> -
> static int send_cgroupstats_cmd(int fd, int family_id, uint32_t cgroup_fd,
> int flags)
> {
> @@ -203,15 +83,12 @@ static int recv_cgroupstats_response(int fd, struct cgroupstats *stats)
>
> rem = nlh->nlmsg_len - NLMSG_HDRLEN - GENL_HDRLEN;
> na = (struct nlattr *)((char *)genl + GENL_HDRLEN);
> - while (rem >= (int)sizeof(*na) &&
> - na->nla_len >= (int)sizeof(*na) &&
> - na->nla_len <= rem) {
> + while (nla_ok(na, rem)) {
> if (na->nla_type == CGROUPSTATS_TYPE_CGROUP_STATS) {
> memcpy(stats, nla_data(na), sizeof(*stats));
> return 0;
> }
> - rem -= NLA_ALIGN(na->nla_len);
> - na = (struct nlattr *)((char *)na + NLA_ALIGN(na->nla_len));
> + na = nla_next(na, &rem);
> }
> }
>
> diff --git a/tools/testing/selftests/acct/netlink_helper.c b/tools/testing/selftests/acct/netlink_helper.c
> new file mode 100644
> index 000000000000..3ed834f0e770
> --- /dev/null
> +++ b/tools/testing/selftests/acct/netlink_helper.c
> @@ -0,0 +1,116 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <errno.h>
> +#include <stdint.h>
> +#include <string.h>
> +#include <sys/socket.h>
> +#include <sys/time.h>
> +#include <unistd.h>
> +#include <linux/genetlink.h>
> +
> +#include "netlink_helper.h"
> +
> +int netlink_open(void)
> +{
> + struct timeval tv = { .tv_sec = ACCT_RCV_TIMEOUT_SEC };
> + struct sockaddr_nl addr = {
> + .nl_family = AF_NETLINK,
> + .nl_pid = getpid(),
> + };
> + int fd;
> +
> + fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
> + if (fd < 0)
> + return -errno;
> +
> + if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
> + int err = -errno;
> +
> + close(fd);
> + return err;
> + }
> +
> + if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
> + int err = -errno;
> +
> + close(fd);
> + return err;
> + }
> +
> + return fd;
> +}
> +
> +int send_request(int fd, void *buf, size_t len)
> +{
> + struct sockaddr_nl addr = {
> + .nl_family = AF_NETLINK,
> + };
> +
> + if (sendto(fd, buf, len, 0, (struct sockaddr *)&addr, sizeof(addr)) < 0)
> + return -errno;
> +
> + return 0;
> +}
> +
> +/*
> + * Resolve the generic netlink family ID for @name.
> + * Returns the family ID (>= 0) on success, negative errno on failure.
> + */
> +int get_family_id(int fd, const char *name)
> +{
> + struct {
> + struct nlmsghdr nlh;
> + struct genlmsghdr genl;
> + char buf[256];
> + } req = { 0 };
> + char resp[8192];
> + struct nlmsghdr *nlh;
> + struct genlmsghdr *genl;
> + struct nlattr *na;
> + int len;
> + int rem;
> + int ret;
> +
> + req.nlh.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
> + req.nlh.nlmsg_type = GENL_ID_CTRL;
> + req.nlh.nlmsg_flags = NLM_F_REQUEST;
> + req.nlh.nlmsg_seq = 1;
> + req.nlh.nlmsg_pid = getpid();
> +
> + req.genl.cmd = CTRL_CMD_GETFAMILY;
> + req.genl.version = 1;
> +
> + na = (struct nlattr *)((char *)&req + NLMSG_ALIGN(req.nlh.nlmsg_len));
> + na->nla_type = CTRL_ATTR_FAMILY_NAME;
> + na->nla_len = NLA_HDRLEN + strlen(name) + 1;
> + memcpy(nla_data(na), name, strlen(name) + 1);
> + req.nlh.nlmsg_len = NLMSG_ALIGN(req.nlh.nlmsg_len) + NLA_ALIGN(na->nla_len);
> +
> + ret = send_request(fd, &req, req.nlh.nlmsg_len);
> + if (ret)
> + return ret;
> +
> + len = recv(fd, resp, sizeof(resp), 0);
> + if (len < 0)
> + return -errno;
> +
> + for (nlh = (struct nlmsghdr *)resp; NLMSG_OK(nlh, len);
> + nlh = NLMSG_NEXT(nlh, len)) {
> + if (nlh->nlmsg_type == NLMSG_ERROR) {
> + struct nlmsgerr *err = NLMSG_DATA(nlh);
> +
> + return err->error ? err->error : -ENOENT;
> + }
> +
> + genl = (struct genlmsghdr *)NLMSG_DATA(nlh);
> + rem = nlh->nlmsg_len - NLMSG_HDRLEN - GENL_HDRLEN;
> + na = (struct nlattr *)((char *)genl + GENL_HDRLEN);
> + while (nla_ok(na, rem)) {
> + if (na->nla_type == CTRL_ATTR_FAMILY_ID)
> + return *(uint16_t *)nla_data(na);
> + na = nla_next(na, &rem);
> + }
> + }
> +
> + return -ENOENT;
> +}
> diff --git a/tools/testing/selftests/acct/netlink_helper.h b/tools/testing/selftests/acct/netlink_helper.h
> new file mode 100644
> index 000000000000..0320729c4c06
> --- /dev/null
> +++ b/tools/testing/selftests/acct/netlink_helper.h
> @@ -0,0 +1,44 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Shared generic netlink helpers for the acct selftests.
> + */
> +#ifndef ACSELFTESTS_ACCT_NETLINK_HELPER_H
> +#define ACSELFTESTS_ACCT_NETLINK_HELPER_H
> +
> +#include <stdbool.h>
> +#include <linux/netlink.h>
> +
> +#ifndef NLA_ALIGNTO
> +#define NLA_ALIGNTO 4
> +#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
> +#define NLA_HDRLEN ((int)NLA_ALIGN(sizeof(struct nlattr)))
> +#endif
> +
> +/* Fail an individual test case instead of hanging the whole binary. */
> +#define ACCT_RCV_TIMEOUT_SEC 2
> +
> +static inline void *nla_data(const struct nlattr *na)
> +{
> + return (void *)((char *)na + NLA_HDRLEN);
> +}
> +
> +static inline bool nla_ok(const struct nlattr *na, int remaining)
> +{
> + return remaining >= (int)sizeof(*na) &&
> + na->nla_len >= sizeof(*na) &&
> + na->nla_len <= remaining;
> +}
> +
> +static inline struct nlattr *nla_next(const struct nlattr *na, int *remaining)
> +{
> + int aligned_len = NLA_ALIGN(na->nla_len);
> +
> + *remaining -= aligned_len;
> + return (struct nlattr *)((char *)na + aligned_len);
> +}
> +
> +int netlink_open(void);
> +int send_request(int fd, void *buf, size_t len);
> +int get_family_id(int fd, const char *name);
> +
> +#endif /* ACSELFTESTS_ACCT_NETLINK_HELPER_H */
> diff --git a/tools/testing/selftests/acct/taskstats_fill_stats_tgid.c b/tools/testing/selftests/acct/taskstats_fill_stats_tgid.c
> index d6cab4ae26f2..9a4c1554dee3 100644
> --- a/tools/testing/selftests/acct/taskstats_fill_stats_tgid.c
> +++ b/tools/testing/selftests/acct/taskstats_fill_stats_tgid.c
> @@ -16,14 +16,9 @@
> #include <time.h>
> #include <unistd.h>
>
> +#include "netlink_helper.h"
> #include "kselftest.h"
>
> -#ifndef NLA_ALIGN
> -#define NLA_ALIGNTO 4
> -#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
> -#define NLA_HDRLEN ((int)NLA_ALIGN(sizeof(struct nlattr)))
> -#endif
> -
> #define BUSY_NS (200ULL * 1000 * 1000)
>
> struct worker_ctx {
> @@ -35,26 +30,6 @@ struct worker_ctx {
>
> static unsigned long busy_sink;
>
> -static void *taskstats_nla_data(const struct nlattr *na)
> -{
> - return (void *)((char *)na + NLA_HDRLEN);
> -}
> -
> -static bool taskstats_nla_ok(const struct nlattr *na, int remaining)
> -{
> - return remaining >= (int)sizeof(*na) &&
> - na->nla_len >= sizeof(*na) &&
> - na->nla_len <= remaining;
> -}
> -
> -static struct nlattr *taskstats_nla_next(const struct nlattr *na, int *remaining)
> -{
> - int aligned_len = NLA_ALIGN(na->nla_len);
> -
> - *remaining -= aligned_len;
> - return (struct nlattr *)((char *)na + aligned_len);
> -}
> -
> static uint64_t timespec_diff_ns(const struct timespec *start,
> const struct timespec *end)
> {
> @@ -84,99 +59,6 @@ static void burn_cpu_for_ns(uint64_t runtime_ns)
> busy_sink = acc;
> }
>
> -static int netlink_open(void)
> -{
> - struct sockaddr_nl addr = {
> - .nl_family = AF_NETLINK,
> - .nl_pid = getpid(),
> - };
> - int fd;
> -
> - fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
> - if (fd < 0)
> - return -errno;
> -
> - if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
> - int err = -errno;
> -
> - close(fd);
> - return err;
> - }
> -
> - return fd;
> -}
> -
> -static int send_request(int fd, void *buf, size_t len)
> -{
> - struct sockaddr_nl addr = {
> - .nl_family = AF_NETLINK,
> - };
> -
> - if (sendto(fd, buf, len, 0, (struct sockaddr *)&addr, sizeof(addr)) < 0)
> - return -errno;
> -
> - return 0;
> -}
> -
> -static int get_family_id(int fd, const char *name)
> -{
> - struct {
> - struct nlmsghdr nlh;
> - struct genlmsghdr genl;
> - char buf[256];
> - } req = { 0 };
> - char resp[8192];
> - struct nlmsghdr *nlh;
> - struct genlmsghdr *genl;
> - struct nlattr *na;
> - int len;
> - int rem;
> - int ret;
> -
> - req.nlh.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
> - req.nlh.nlmsg_type = GENL_ID_CTRL;
> - req.nlh.nlmsg_flags = NLM_F_REQUEST;
> - req.nlh.nlmsg_seq = 1;
> - req.nlh.nlmsg_pid = getpid();
> -
> - req.genl.cmd = CTRL_CMD_GETFAMILY;
> - req.genl.version = 1;
> -
> - na = (struct nlattr *)((char *)&req + NLMSG_ALIGN(req.nlh.nlmsg_len));
> - na->nla_type = CTRL_ATTR_FAMILY_NAME;
> - na->nla_len = NLA_HDRLEN + strlen(name) + 1;
> - memcpy(taskstats_nla_data(na), name, strlen(name) + 1);
> - req.nlh.nlmsg_len = NLMSG_ALIGN(req.nlh.nlmsg_len) + NLA_ALIGN(na->nla_len);
> -
> - ret = send_request(fd, &req, req.nlh.nlmsg_len);
> - if (ret)
> - return ret;
> -
> - len = recv(fd, resp, sizeof(resp), 0);
> - if (len < 0)
> - return -errno;
> -
> - for (nlh = (struct nlmsghdr *)resp; NLMSG_OK(nlh, len);
> - nlh = NLMSG_NEXT(nlh, len)) {
> - if (nlh->nlmsg_type == NLMSG_ERROR) {
> - struct nlmsgerr *err = NLMSG_DATA(nlh);
> -
> - return err->error ? err->error : -ENOENT;
> - }
> -
> - genl = (struct genlmsghdr *)NLMSG_DATA(nlh);
> - rem = nlh->nlmsg_len - NLMSG_HDRLEN - GENL_HDRLEN;
> - na = (struct nlattr *)((char *)genl + GENL_HDRLEN);
> - while (taskstats_nla_ok(na, rem)) {
> - if (na->nla_type == CTRL_ATTR_FAMILY_ID)
> - return *(uint16_t *)taskstats_nla_data(na);
> - na = taskstats_nla_next(na, &rem);
> - }
> - }
> -
> - return -ENOENT;
> -}
> -
> static int get_taskstats(int fd, int family_id, uint16_t attr_type, uint32_t id,
> struct taskstats *stats)
> {
> @@ -209,7 +91,7 @@ static int get_taskstats(int fd, int family_id, uint16_t attr_type, uint32_t id,
> na = (struct nlattr *)((char *)&req + NLMSG_ALIGN(req.nlh.nlmsg_len));
> na->nla_type = attr_type;
> na->nla_len = NLA_HDRLEN + sizeof(id);
> - memcpy(taskstats_nla_data(na), &id, sizeof(id));
> + memcpy(nla_data(na), &id, sizeof(id));
> req.nlh.nlmsg_len = NLMSG_ALIGN(req.nlh.nlmsg_len) + NLA_ALIGN(na->nla_len);
>
> ret = send_request(fd, &req, req.nlh.nlmsg_len);
> @@ -231,21 +113,21 @@ static int get_taskstats(int fd, int family_id, uint16_t attr_type, uint32_t id,
> genl = (struct genlmsghdr *)NLMSG_DATA(nlh);
> rem = nlh->nlmsg_len - NLMSG_HDRLEN - GENL_HDRLEN;
> na = (struct nlattr *)((char *)genl + GENL_HDRLEN);
> - while (taskstats_nla_ok(na, rem)) {
> + while (nla_ok(na, rem)) {
> if (na->nla_type == TASKSTATS_TYPE_AGGR_PID ||
> na->nla_type == TASKSTATS_TYPE_AGGR_TGID) {
> - nested = (struct nlattr *)taskstats_nla_data(na);
> + nested = (struct nlattr *)nla_data(na);
> nrem = na->nla_len - NLA_HDRLEN;
> - while (taskstats_nla_ok(nested, nrem)) {
> + while (nla_ok(nested, nrem)) {
> if (nested->nla_type == TASKSTATS_TYPE_STATS) {
> - memcpy(stats, taskstats_nla_data(nested),
> + memcpy(stats, nla_data(nested),
> sizeof(*stats));
> return 0;
> }
> - nested = taskstats_nla_next(nested, &nrem);
> + nested = nla_next(nested, &nrem);
> }
> }
> - na = taskstats_nla_next(na, &rem);
> + na = nla_next(na, &rem);
> }
> }
>
> --
> 2.43.0
>
Thanks makes sense!
Acked-by: Balbir Singh <balbirs@nvidia.com>
prev parent reply other threads:[~2026-07-13 2:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-12 17:13 Yiyang Chen
2026-07-13 2:34 ` Balbir Singh [this message]
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