netdev - Re: [PATCH net-next v2] net/smc: add sysctl for smc_limit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c516f91d-9db4-4948-a5dc-df1660948f85@linux.alibaba.com>
Date: Wed, 21 Aug 2024 15:21:22 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: "D. Wythe" <alibuda@...ux.alibaba.com>, kgraul@...ux.ibm.com,
 wenjia@...ux.ibm.com, jaka@...ux.ibm.com, wintera@...ux.ibm.com
Cc: kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
 linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
 tonylu@...ux.alibaba.com, pabeni@...hat.com, edumazet@...gle.com
Subject: Re: [PATCH net-next v2] net/smc: add sysctl for smc_limit_hs



On 2024/8/21 10:36, D. Wythe wrote:
> From: "D. Wythe" <alibuda@...ux.alibaba.com>
> 
> In commit 48b6190a0042 ("net/smc: Limit SMC visits when handshake workqueue congested"),
> we introduce a mechanism to put constraint on SMC connections visit
> according to the pressure of SMC handshake process.
> 
> At that time, we believed that controlling the feature through netlink
> was sufficient. However, most people have realized now that netlink is
> not convenient in container scenarios, and sysctl is a more suitable
> approach.
> 
> In addition, since commit 462791bbfa35 ("net/smc: add sysctl interface for SMC")
> had introcuded smc_sysctl_net_init(), it is reasonable for us to
> initialize limit_smc_hs in it instead of initializing it in
> smc_pnet_net_int().
> 
> Signed-off-by: D. Wythe <alibuda@...ux.alibaba.com>

LGTM. Thanks!

Reviewed-by: Wen Gu <guwen@...ux.alibaba.com>

> ---
> v1 -> v2:
> 
> Modified the description in the commit and removed the incorrect
> spelling.
> 
>   net/smc/smc_pnet.c   |  3 ---
>   net/smc/smc_sysctl.c | 11 +++++++++++
>   2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
> index 2adb92b..1dd3623 100644
> --- a/net/smc/smc_pnet.c
> +++ b/net/smc/smc_pnet.c
> @@ -887,9 +887,6 @@ int smc_pnet_net_init(struct net *net)
>   
>   	smc_pnet_create_pnetids_list(net);
>   
> -	/* disable handshake limitation by default */
> -	net->smc.limit_smc_hs = 0;
> -
>   	return 0;
>   }
>   
> diff --git a/net/smc/smc_sysctl.c b/net/smc/smc_sysctl.c
> index 13f2bc0..2fab645 100644
> --- a/net/smc/smc_sysctl.c
> +++ b/net/smc/smc_sysctl.c
> @@ -90,6 +90,15 @@
>   		.extra1		= &conns_per_lgr_min,
>   		.extra2		= &conns_per_lgr_max,
>   	},
> +	{
> +		.procname	= "limit_smc_hs",
> +		.data		= &init_net.smc.limit_smc_hs,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec_minmax,
> +		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_ONE,
> +	},
>   };
>   
>   int __net_init smc_sysctl_net_init(struct net *net)
> @@ -121,6 +130,8 @@ int __net_init smc_sysctl_net_init(struct net *net)
>   	WRITE_ONCE(net->smc.sysctl_rmem, net_smc_rmem_init);
>   	net->smc.sysctl_max_links_per_lgr = SMC_LINKS_PER_LGR_MAX_PREFER;
>   	net->smc.sysctl_max_conns_per_lgr = SMC_CONN_PER_LGR_PREFER;
> +	/* disable handshake limitation by default */
> +	net->smc.limit_smc_hs = 0;
>   
>   	return 0;
>