Re: [PATCH net-next v5 5/5] net/smc: Add global configure for auto fallback by netlink

[Tony Lu <tonylu@linux.alibaba.com>]

On Tue, Feb 08, 2022 at 08:53:13PM +0800, D. Wythe wrote:
> From: "D. Wythe" <alibuda@linux.alibaba.com>
> 
> @@ -248,6 +248,8 @@ int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
>  		goto errattr;
>  	if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true))
>  		goto errattr;
> +	if (nla_put_u8(skb, SMC_NLA_SYS_AUTO_FALLBACK, smc_auto_fallback))

READ_ONCE(smc_auto_fallback) ?

> +		goto errattr;
>  	smc_clc_get_hostname(&host);
>  	if (host) {
>  		memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
> diff --git a/net/smc/smc_netlink.c b/net/smc/smc_netlink.c
> index f13ab06..a7de517 100644
> --- a/net/smc/smc_netlink.c
> +++ b/net/smc/smc_netlink.c
> @@ -111,6 +111,16 @@
>  		.flags = GENL_ADMIN_PERM,
>  		.doit = smc_nl_disable_seid,
>  	},
> +	{
> +		.cmd = SMC_NETLINK_ENABLE_AUTO_FALLBACK,
> +		.flags = GENL_ADMIN_PERM,
> +		.doit = smc_enable_auto_fallback,
> +	},
> +	{
> +		.cmd = SMC_NETLINK_DISABLE_AUTO_FALLBACK,
> +		.flags = GENL_ADMIN_PERM,
> +		.doit = smc_disable_auto_fallback,
> +	},
>  };

Consider adding the separated cmd to query the status of this config,
just as SEID does?

It is common to check this value after user-space setted. Combined with
sys_info maybe a little heavy in this scene.

Thanks,
Tony Lu