netdev - Re: [PATCH net-next v5 3/3] net/smc: Introduce IPPROTO

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Date: Mon, 3 Jun 2024 09:19:01 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: "D. Wythe" <alibuda@...ux.alibaba.com>
CC: <kgraul@...ux.ibm.com>, <wenjia@...ux.ibm.com>, <jaka@...ux.ibm.com>,
        <wintera@...ux.ibm.com>, <guwen@...ux.alibaba.com>, <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 v5 3/3] net/smc: Introduce IPPROTO_SMC

On 2024-05-30 at 15:00:40, D. Wythe (alibuda@...ux.alibaba.com) wrote:
> From: "D. Wythe" <alibuda@...ux.alibaba.com>
>
> +
> +int __init smc_inet_init(void)
> +{
> +	int rc;
> +
> +	rc = proto_register(&smc_inet_prot, 1);
> +	if (rc) {
> +		pr_err("%s: proto_register smc_inet_prot fails with %d\n", __func__, rc);
> +		return rc;
> +	}
> +	/* no return value */
> +	inet_register_protosw(&smc_inet_protosw);
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +	rc = proto_register(&smc_inet6_prot, 1);
> +	if (rc) {
> +		pr_err("%s: proto_register smc_inet6_prot fails with %d\n", __func__, rc);
> +		goto out_inet6_prot;
> +	}
> +	rc = inet6_register_protosw(&smc_inet6_protosw);
> +	if (rc) {
> +		pr_err("%s: inet6_register_protosw smc_inet6_protosw fails with %d\n",
> +		       __func__, rc);
> +		goto out_inet6_protosw;
> +	}
> +#endif /* CONFIG_IPV6 */
> +
> +	return rc;
> +#if IS_ENABLED(CONFIG_IPV6)
Can you combine this #if with above one ? Any way you need this only in case of ipv6.
Error handling with #if is an hindrance to a good readability.

> +out_inet6_protosw:
> +	proto_unregister(&smc_inet6_prot);
> +out_inet6_prot:
> +	inet_unregister_protosw(&smc_inet_protosw);
> +	proto_unregister(&smc_inet_prot);
> +	return rc;
> +#endif /* CONFIG_IPV6 */
> +}
> +
> +void smc_inet_exit(void)
> +{
> +#if IS_ENABLED(CONFIG_IPV6)
> +	inet6_unregister_protosw(&smc_inet6_protosw);
> +	proto_unregister(&smc_inet6_prot);
> +#endif /* CONFIG_IPV6 */
> +	inet_unregister_protosw(&smc_inet_protosw);
> +	proto_unregister(&smc_inet_prot);
> +}
> diff --git a/net/smc/smc_inet.h b/net/smc/smc_inet.h
> new file mode 100644
> index 00000000..a489c8a
> --- /dev/null
> +++ b/net/smc/smc_inet.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + *  Shared Memory Communications over RDMA (SMC-R) and RoCE
> + *
> + *  Definitions for the IPPROTO_SMC (socket related)
> +
> + *  Copyright IBM Corp. 2016
> + *  Copyright (c) 2024, Alibaba Inc.
> + *
> + *  Author: D. Wythe <alibuda@...ux.alibaba.com>
> + */
> +#ifndef __INET_SMC
> +#define __INET_SMC
> +
> +/* Initialize protocol registration on IPPROTO_SMC,
> + * @return 0 on success
> + */
> +int smc_inet_init(void);
> +
> +void smc_inet_exit(void);
> +
> +#endif /* __INET_SMC */
> --
> 1.8.3.1
>