netdev - Re: [PATCH v6 1/2] net/handshake: Create a NETLINK service for handling handshake requests

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Date:   Sat, 4 Mar 2023 17:25:21 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Chuck Lever <cel@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        "kernel-tls-handshake@...ts.linux.dev" 
        <kernel-tls-handshake@...ts.linux.dev>,
        John Haxby <john.haxby@...cle.com>
Subject: Re: [PATCH v6 1/2] net/handshake: Create a NETLINK service for
 handling handshake requests



> On Mar 3, 2023, at 9:21 PM, Jakub Kicinski <kuba@...nel.org> wrote:
> 
> On Fri, 03 Mar 2023 13:51:31 -0500 Chuck Lever wrote:
> 
>> +static const struct genl_split_ops handshake_nl_ops[] = {
>> +	{
>> +		.cmd		= HANDSHAKE_CMD_ACCEPT,
>> +		.doit		= handshake_nl_accept_doit,
>> +		.policy		= handshake_accept_nl_policy,
>> +		.maxattr	= HANDSHAKE_A_ACCEPT_HANDLER_CLASS,
>> +		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
>> +	},
>> +	{
>> +		.cmd		= HANDSHAKE_CMD_DONE,
>> +		.doit		= handshake_nl_done_doit,
>> +		.policy		= handshake_done_nl_policy,
>> +		.maxattr	= HANDSHAKE_A_DONE_MAX,
>> +		.flags		= GENL_CMD_CAP_DO,
>> +	},
>> +};
>> +
>> +static const struct genl_multicast_group handshake_nl_mcgrps[] = {
>> +	[HANDSHAKE_HANDLER_CLASS_NONE] = { .name = HANDSHAKE_MCGRP_NONE, },
>> +};
>> +
>> +static struct genl_family __ro_after_init handshake_genl_family = {
>> +	.hdrsize		= 0,
>> +	.name			= HANDSHAKE_FAMILY_NAME,
>> +	.version		= HANDSHAKE_FAMILY_VERSION,
>> +	.netnsok		= true,
>> +	.parallel_ops		= true,
>> +	.n_mcgrps		= ARRAY_SIZE(handshake_nl_mcgrps),
>> +	.n_split_ops		= ARRAY_SIZE(handshake_nl_ops),
>> +	.split_ops		= handshake_nl_ops,
>> +	.mcgrps			= handshake_nl_mcgrps,
>> +	.module			= THIS_MODULE,
>> +};
> 
> You're not auto-generating the family, ops, and policies?
> Any reason?

I couldn't find a way to have the generated source appear
in the middle of a source file. But I see that's not the
way others are doing it, so I have added separate files
under net/handshake for the generated source and header
material. Two things, though:

1. I don't see a generated struct genl_family.

2. The SPDX tags in the generated source files is "BSD
   3-clause", but the tag in my spec is "GPL-2.0 with
   syscall note". Oddly, the generated uapi header still
   has the latter (correct) tag.

--
Chuck Lever