linux-kernel - Re: [PATCH iproute2-next 2/3] rdma: Add an option to set privileged QKEY parameter

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Message-ID: <87il72aiqm.fsf@nvidia.com>
Date:   Thu, 19 Oct 2023 12:38:10 +0200
From:   Petr Machata <petrm@...dia.com>
To:     Patrisious Haddad <phaddad@...dia.com>
CC:     <jgg@...pe.ca>, <leon@...nel.org>, <dsahern@...il.com>,
        <stephen@...workplumber.org>, <netdev@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>,
        <michaelgur@...dia.com>
Subject: Re: [PATCH iproute2-next 2/3] rdma: Add an option to set privileged
 QKEY parameter


Patrisious Haddad <phaddad@...dia.com> writes:

> @@ -40,6 +45,22 @@ static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
>  				   mode_str);
>  	}
>  
> +	if (tb[RDMA_NLDEV_SYS_ATTR_PRIVILEGED_QKEY_MODE]) {
> +		const char *pqkey_str;
> +		uint8_t pqkey_mode;
> +
> +		pqkey_mode =
> +			mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_PRIVILEGED_QKEY_MODE]);
> +
> +		if (pqkey_mode < ARRAY_SIZE(privileged_qkey_str))
> +			pqkey_str = privileged_qkey_str[pqkey_mode];
> +		else
> +			pqkey_str = "unknown";
> +
> +		print_color_string(PRINT_ANY, COLOR_NONE, "privileged-qkey",
> +				   "privileged-qkey %s ", pqkey_str);
> +	}
> +

Elsewhere in the file, you just use print_color_on_off(), why not here?

>  	if (tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK])
>  		cof = mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK]);
>  

> @@ -111,10 +155,25 @@ static int sys_set_netns_args(struct rd *rd)
>  	return sys_set_netns_cmd(rd, cmd);
>  }
>  
> +static int sys_set_privileged_qkey_args(struct rd *rd)
> +{
> +	bool cmd;
> +
> +	if (rd_no_arg(rd) || !sys_valid_privileged_qkey_cmd(rd_argv(rd))) {
> +		pr_err("valid options are: { on | off }\n");
> +		return -EINVAL;
> +	}

This could use parse_on_off().

> +
> +	cmd = (strcmp(rd_argv(rd), "on") == 0) ? true : false;
> +
> +	return sys_set_privileged_qkey_cmd(rd, cmd);
> +}
> +
>  static int sys_set_help(struct rd *rd)
>  {
>  	pr_out("Usage: %s system set [PARAM] value\n", rd->filename);
>  	pr_out("            system set netns { shared | exclusive }\n");
> +	pr_out("            system set privileged-qkey { on | off }\n");
>  	return 0;
>  }
>  
> @@ -124,6 +183,7 @@ static int sys_set(struct rd *rd)
>  		{ NULL,			sys_set_help },
>  		{ "help",		sys_set_help },
>  		{ "netns",		sys_set_netns_args},
> +		{ "privileged-qkey",	sys_set_privileged_qkey_args},
>  		{ 0 }
>  	};

The rest of the code looks sane to me, but I'm not familiar with the
feature.