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

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Message-ID: <c7c9562a-5c6d-eec5-3255-70238a13e96c@nvidia.com>
Date:   Sun, 22 Oct 2023 10:41:56 +0300
From:   Patrisious Haddad <phaddad@...dia.com>
To:     Petr Machata <petrm@...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


On 10/19/2023 1:38 PM, Petr Machata wrote:
> 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?

The print_color_on_off was used for copy-on-fork which as you see has no 
set function,

I was simply trying to be consistent with this file convention & style, 
whereas print_color_string was used for the other configurable value 
("netns"), I can obviously change that if you all see it as necessary.

>
>>   	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().
You are absolutely correct, but just as well was trying to maintain same 
code style as the previous configurable value we have here, but I think 
using parse_on_off here can save us some code.
>
>> +
>> +	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.
If no one else has any comments soon, and these two comments are 
actually considered critical I can re-send my patches with those issues 
fixed.