diff mbox series

[bpf-next,v2,1/3] tcp: add TCP_RTO_MAX_MIN_SEC definition

Message ID 20250217034245.11063-2-kerneljasonxing@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: support setting max RTO for bpf_setsockopt | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/apply fail Patch does not apply to bpf-next-0
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Commit Message

Jason Xing Feb. 17, 2025, 3:42 a.m. UTC 
Add minimum value definition as the lower bound of RTO MAX
set by users. No functional changes here.

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
---
 include/net/tcp.h          | 1 +
 net/ipv4/sysctl_net_ipv4.c | 3 ++-
 net/ipv4/tcp.c             | 3 ++-
 3 files changed, 5 insertions(+), 2 deletions(-)

Comments

Martin KaFai Lau Feb. 18, 2025, 11:38 p.m. UTC | #1 
On 2/16/25 7:42 PM, Jason Xing wrote:
> Add minimum value definition as the lower bound of RTO MAX
> set by users. No functional changes here.

If it is no-op, why it is needed? The commit message didn't explain it either.
I also cannot guess how patch 2 depends on patch 1.

pw-bot: cr
Jason Xing Feb. 18, 2025, 11:45 p.m. UTC | #2 
On Wed, Feb 19, 2025 at 7:38 AM Martin KaFai Lau <martin.lau@linux.dev> wrote:
>
> On 2/16/25 7:42 PM, Jason Xing wrote:
> > Add minimum value definition as the lower bound of RTO MAX
> > set by users. No functional changes here.
>
> If it is no-op, why it is needed? The commit message didn't explain it either.
> I also cannot guess how patch 2 depends on patch 1.

It's more of a cleanup patch :)

Thanks,
Jason
Jakub Kicinski Feb. 19, 2025, 1:47 a.m. UTC | #3 
On Tue, 18 Feb 2025 15:38:17 -0800 Martin KaFai Lau wrote:
> On 2/16/25 7:42 PM, Jason Xing wrote:
> > Add minimum value definition as the lower bound of RTO MAX
> > set by users. No functional changes here.  
> 
> If it is no-op, why it is needed? The commit message didn't explain it either.
> I also cannot guess how patch 2 depends on patch 1.

FWIW this patch also gave me pause when looking at v1.
I don't think this define makes the code any easier to follow.
Jason Xing Feb. 19, 2025, 2:12 a.m. UTC | #4 
On Wed, Feb 19, 2025 at 9:47 AM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Tue, 18 Feb 2025 15:38:17 -0800 Martin KaFai Lau wrote:
> > On 2/16/25 7:42 PM, Jason Xing wrote:
> > > Add minimum value definition as the lower bound of RTO MAX
> > > set by users. No functional changes here.
> >
> > If it is no-op, why it is needed? The commit message didn't explain it either.
> > I also cannot guess how patch 2 depends on patch 1.
>
> FWIW this patch also gave me pause when looking at v1.
> I don't think this define makes the code any easier to follow.

Okay, I will drop this in the next re-spin.

Thanks,
Jason
diff mbox series

Patch

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7fd2d7fa4532..b6bedbe68636 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -143,6 +143,7 @@  static_assert((1 << ATO_BITS) > TCP_DELACK_MAX);
 #define TCP_DELACK_MIN	4U
 #define TCP_ATO_MIN	4U
 #endif
+#define TCP_RTO_MAX_MIN_SEC 1
 #define TCP_RTO_MAX_SEC 120
 #define TCP_RTO_MAX	((unsigned)(TCP_RTO_MAX_SEC * HZ))
 #define TCP_RTO_MIN	((unsigned)(HZ / 5))
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 3a43010d726f..53942c225e0b 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -28,6 +28,7 @@  static int tcp_adv_win_scale_max = 31;
 static int tcp_app_win_max = 31;
 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
 static int tcp_min_snd_mss_max = 65535;
+static int tcp_rto_max_min = TCP_RTO_MAX_MIN_SEC * MSEC_PER_SEC;
 static int tcp_rto_max_max = TCP_RTO_MAX_SEC * MSEC_PER_SEC;
 static int ip_privileged_port_min;
 static int ip_privileged_port_max = 65535;
@@ -1590,7 +1591,7 @@  static struct ctl_table ipv4_net_table[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ONE_THOUSAND,
+		.extra1		= &tcp_rto_max_min,
 		.extra2		= &tcp_rto_max_max,
 	},
 };
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 992d5c9b2487..2373ab1a1d47 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3812,7 +3812,8 @@  int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 					   TCP_RTO_MAX / HZ));
 		return 0;
 	case TCP_RTO_MAX_MS:
-		if (val < MSEC_PER_SEC || val > TCP_RTO_MAX_SEC * MSEC_PER_SEC)
+		if (val < TCP_RTO_MAX_MIN_SEC * MSEC_PER_SEC ||
+		    val > TCP_RTO_MAX_SEC * MSEC_PER_SEC)
 			return -EINVAL;
 		WRITE_ONCE(inet_csk(sk)->icsk_rto_max, msecs_to_jiffies(val));
 		return 0;