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[net-next] net: core: use shared sysctl macro

Message ID 20220222125628.39363-1-xiangxia.m.yue@gmail.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series [net-next] net: core: use shared sysctl macro | expand

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netdev/header_inline success No static functions without inline keyword in header files
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Commit Message

Tonghao Zhang Feb. 22, 2022, 12:56 p.m. UTC 
From: Tonghao Zhang <xiangxia.m.yue@gmail.com>

This patch introdues the SYSCTL_THREE, and replace the
two, three and long_one to SYSCTL_XXX accordingly.

Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: David Ahern <dsahern@kernel.org>
Cc: Simon Horman <horms@verge.net.au>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Lorenz Bauer <lmb@cloudflare.com>
Cc: Akhmat Karakotov <hmukos@yandex-team.ru>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---
 fs/proc/proc_sysctl.c          |  2 +-
 include/linux/sysctl.h         | 13 +++++++------
 net/core/sysctl_net_core.c     | 14 +++++---------
 net/ipv4/sysctl_net_ipv4.c     | 16 ++++++----------
 net/ipv6/sysctl_net_ipv6.c     |  6 ++----
 net/netfilter/ipvs/ip_vs_ctl.c |  4 +---
 6 files changed, 22 insertions(+), 33 deletions(-)

Comments

Luis R. Rodriguez Feb. 23, 2022, 1:29 a.m. UTC | #1 
On Tue, Feb 22, 2022 at 08:56:28PM +0800, xiangxia.m.yue@gmail.com wrote:
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index 6353d6db69b2..b2ac6542455f 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -42,12 +42,13 @@ struct ctl_dir;
>  #define SYSCTL_ZERO			((void *)&sysctl_vals[1])
>  #define SYSCTL_ONE			((void *)&sysctl_vals[2])
>  #define SYSCTL_TWO			((void *)&sysctl_vals[3])
> -#define SYSCTL_FOUR			((void *)&sysctl_vals[4])
> -#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[5])
> -#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[6])
> -#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[7])
> -#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[8])
> -#define SYSCTL_INT_MAX			((void *)&sysctl_vals[9])
> +#define SYSCTL_THREE			((void *)&sysctl_vals[4])
> +#define SYSCTL_FOUR			((void *)&sysctl_vals[5])
> +#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[6])
> +#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[7])
> +#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[8])
> +#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[9])
> +#define SYSCTL_INT_MAX			((void *)&sysctl_vals[10])

xiangxia, thanks for you patch!

I welcome this change but can you please also extend lib/test_sysctl.c
(selftests) and/or kernel/sysctl-test.c (UML kunit test) to ensure we
don't regress any existing mappings here.

The test can be really simply and would seem stupid but it would be of
great help. It would just make sure SYSCTL_ONE == 1, SYSCTL_TWO == 2, etc.

I think using kunit makes more sense here. Once you then then have this
test, you can use it to verify you have not introduced a regression and
re-send the patch.

Thanks!

  Luis
Tonghao Zhang March 16, 2022, 3:08 p.m. UTC | #2 
On Wed, Feb 23, 2022 at 9:29 AM Luis Chamberlain <mcgrof@kernel.org> wrote:
>
> On Tue, Feb 22, 2022 at 08:56:28PM +0800, xiangxia.m.yue@gmail.com wrote:
> > diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> > index 6353d6db69b2..b2ac6542455f 100644
> > --- a/include/linux/sysctl.h
> > +++ b/include/linux/sysctl.h
> > @@ -42,12 +42,13 @@ struct ctl_dir;
> >  #define SYSCTL_ZERO                  ((void *)&sysctl_vals[1])
> >  #define SYSCTL_ONE                   ((void *)&sysctl_vals[2])
> >  #define SYSCTL_TWO                   ((void *)&sysctl_vals[3])
> > -#define SYSCTL_FOUR                  ((void *)&sysctl_vals[4])
> > -#define SYSCTL_ONE_HUNDRED           ((void *)&sysctl_vals[5])
> > -#define SYSCTL_TWO_HUNDRED           ((void *)&sysctl_vals[6])
> > -#define SYSCTL_ONE_THOUSAND          ((void *)&sysctl_vals[7])
> > -#define SYSCTL_THREE_THOUSAND                ((void *)&sysctl_vals[8])
> > -#define SYSCTL_INT_MAX                       ((void *)&sysctl_vals[9])
> > +#define SYSCTL_THREE                 ((void *)&sysctl_vals[4])
> > +#define SYSCTL_FOUR                  ((void *)&sysctl_vals[5])
> > +#define SYSCTL_ONE_HUNDRED           ((void *)&sysctl_vals[6])
> > +#define SYSCTL_TWO_HUNDRED           ((void *)&sysctl_vals[7])
> > +#define SYSCTL_ONE_THOUSAND          ((void *)&sysctl_vals[8])
> > +#define SYSCTL_THREE_THOUSAND                ((void *)&sysctl_vals[9])
> > +#define SYSCTL_INT_MAX                       ((void *)&sysctl_vals[10])
>
> xiangxia, thanks for you patch!
>
> I welcome this change but can you please also extend lib/test_sysctl.c
> (selftests) and/or kernel/sysctl-test.c (UML kunit test) to ensure we
> don't regress any existing mappings here.
>
> The test can be really simply and would seem stupid but it would be of
> great help. It would just make sure SYSCTL_ONE == 1, SYSCTL_TWO == 2, etc.
>
> I think using kunit makes more sense here. Once you then then have this
> test, you can use it to verify you have not introduced a regression and
> re-send the patch.
Sorry for taking so long to reply.

KUnit:
[23:03:58] ================ sysctl_test (10 subtests) =================
[23:03:58] [PASSED] sysctl_test_api_dointvec_null_tbl_data
[23:03:58] [PASSED] sysctl_test_api_dointvec_table_maxlen_unset
[23:03:58] [PASSED] sysctl_test_api_dointvec_table_len_is_zero
[23:03:58] [PASSED] sysctl_test_api_dointvec_table_read_but_position_set
[23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_positive
[23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_negative
[23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_positive
[23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_negative
[23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_less_int_min
[23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_greater_int_max
[23:03:58] =================== [PASSED] sysctl_test ===================


./run_kselftest.sh -c sysctl
....
# Running test: sysctl_test_0006 - run #49
# Checking bitmap handler... ok
# Wed Mar 16 14:58:41 UTC 2022
# Running test: sysctl_test_0007 - run #0
# Boot param test only possible sysctl_test is built-in, not module:
# CONFIG_TEST_SYSCTL=m
ok 1 selftests: sysctl: sysctl.sh


> Thanks!
>
>   Luis
diff mbox series

Patch

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 7d9cfc730bd4..0bdd9249666b 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -26,7 +26,7 @@  static const struct file_operations proc_sys_dir_file_operations;
 static const struct inode_operations proc_sys_dir_operations;
 
 /* shared constants to be used in various sysctls */
-const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
+const int sysctl_vals[] = { -1, 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
 EXPORT_SYMBOL(sysctl_vals);
 
 const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 6353d6db69b2..b2ac6542455f 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -42,12 +42,13 @@  struct ctl_dir;
 #define SYSCTL_ZERO			((void *)&sysctl_vals[1])
 #define SYSCTL_ONE			((void *)&sysctl_vals[2])
 #define SYSCTL_TWO			((void *)&sysctl_vals[3])
-#define SYSCTL_FOUR			((void *)&sysctl_vals[4])
-#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[5])
-#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[6])
-#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[7])
-#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[8])
-#define SYSCTL_INT_MAX			((void *)&sysctl_vals[9])
+#define SYSCTL_THREE			((void *)&sysctl_vals[4])
+#define SYSCTL_FOUR			((void *)&sysctl_vals[5])
+#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[6])
+#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[7])
+#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[8])
+#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[9])
+#define SYSCTL_INT_MAX			((void *)&sysctl_vals[10])
 
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 #define SYSCTL_MAXOLDUID		((void *)&sysctl_vals[10])
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index dbeb8ecbcd98..80af0a7ec233 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -23,14 +23,10 @@ 
 #include <net/busy_poll.h>
 #include <net/pkt_sched.h>
 
-static int two = 2;
-static int three = 3;
 static int int_3600 = 3600;
 static int min_sndbuf = SOCK_MIN_SNDBUF;
 static int min_rcvbuf = SOCK_MIN_RCVBUF;
 static int max_skb_frags = MAX_SKB_FRAGS;
-static long long_one __maybe_unused = 1;
-static long long_max __maybe_unused = LONG_MAX;
 
 static int net_msg_warn;	/* Unused, but still a sysctl */
 
@@ -390,7 +386,7 @@  static struct ctl_table net_core_table[] = {
 		.extra2		= SYSCTL_ONE,
 # else
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 # endif
 	},
 # ifdef CONFIG_HAVE_EBPF_JIT
@@ -401,7 +397,7 @@  static struct ctl_table net_core_table[] = {
 		.mode		= 0600,
 		.proc_handler	= proc_dointvec_minmax_bpf_restricted,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "bpf_jit_kallsyms",
@@ -419,7 +415,7 @@  static struct ctl_table net_core_table[] = {
 		.maxlen		= sizeof(long),
 		.mode		= 0600,
 		.proc_handler	= proc_dolongvec_minmax_bpf_restricted,
-		.extra1		= &long_one,
+		.extra1		= SYSCTL_LONG_ONE,
 		.extra2		= &bpf_jit_limit_max,
 	},
 #endif
@@ -546,7 +542,7 @@  static struct ctl_table net_core_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "devconf_inherit_init_net",
@@ -555,7 +551,7 @@  static struct ctl_table net_core_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &three,
+		.extra2		= SYSCTL_THREE,
 	},
 	{
 		.procname	= "high_order_alloc_disable",
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 1cae27b5dcd8..189cf0a135c0 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -20,10 +20,6 @@ 
 #include <net/protocol.h>
 #include <net/netevent.h>
 
-static int two = 2;
-static int three __maybe_unused = 3;
-static int four = 4;
-static int thousand = 1000;
 static int tcp_retr1_max = 255;
 static int ip_local_port_range_min[] = { 1, 1 };
 static int ip_local_port_range_max[] = { 65535, 65535 };
@@ -1006,7 +1002,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{
 		.procname	= "tcp_max_syn_backlog",
@@ -1059,7 +1055,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_fib_multipath_hash_policy,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &three,
+		.extra2		= SYSCTL_THREE,
 	},
 	{
 		.procname	= "fib_multipath_hash_fields",
@@ -1117,7 +1113,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &four,
+		.extra2		= SYSCTL_FOUR,
 	},
 	{
 		.procname	= "tcp_recovery",
@@ -1303,7 +1299,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &thousand,
+		.extra2		= SYSCTL_ONE_THOUSAND,
 	},
 	{
 		.procname	= "tcp_pacing_ca_ratio",
@@ -1312,7 +1308,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &thousand,
+		.extra2		= SYSCTL_ONE_THOUSAND,
 	},
 	{
 		.procname	= "tcp_wmem",
@@ -1384,7 +1380,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &two,
+		.extra2		= SYSCTL_TWO,
 	},
 	{ }
 };
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index d53dd142bf87..94a0a294c6a1 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -23,8 +23,6 @@ 
 #endif
 #include <linux/ioam6.h>
 
-static int two = 2;
-static int three = 3;
 static int flowlabel_reflect_max = 0x7;
 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
 static u32 rt6_multipath_hash_fields_all_mask =
@@ -172,7 +170,7 @@  static struct ctl_table ipv6_table_template[] = {
 		.mode		= 0644,
 		.proc_handler   = proc_rt6_multipath_hash_policy,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &three,
+		.extra2		= SYSCTL_THREE,
 	},
 	{
 		.procname	= "fib_multipath_hash_fields",
@@ -197,7 +195,7 @@  static struct ctl_table ipv6_table_template[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1         = SYSCTL_ZERO,
-		.extra2         = &two,
+		.extra2         = SYSCTL_TWO,
 	},
 	{
 		.procname	= "ioam6_id",
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 7f645328b47f..efab2b06d373 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1767,8 +1767,6 @@  static int ip_vs_zero_all(struct netns_ipvs *ipvs)
 
 #ifdef CONFIG_SYSCTL
 
-static int three = 3;
-
 static int
 proc_do_defense_mode(struct ctl_table *table, int write,
 		     void *buffer, size_t *lenp, loff_t *ppos)
@@ -1977,7 +1975,7 @@  static struct ctl_table vs_vars[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= &three,
+		.extra2		= SYSCTL_THREE,
 	},
 	{
 		.procname	= "nat_icmp_send",