linux-kernel - Re: [RFC PATCH net-next v5 04/11] net/smc: implement some unsupported operations of loopback-ism

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Date: Wed, 03 Apr 2024 18:25:07 +0200
From: Gerd Bayer <gbayer@...ux.ibm.com>
To: Wen Gu <guwen@...ux.alibaba.com>, wintera@...ux.ibm.com,
        twinkler@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, wenjia@...ux.ibm.com,
        jaka@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com, alibuda@...ux.alibaba.com,
        tonylu@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH net-next v5 04/11] net/smc: implement some
 unsupported operations of loopback-ism

On Sun, 2024-03-24 at 21:55 +0800, Wen Gu wrote:
> This implements some operations that loopback-ism does not support
> currently:
>  - vlan operations, since there is no strong use-case for it.
>  - signal_event operations, since there is no event to be processed 
> by the loopback-ism device.

Hi Wen,

I wonder if the these operations that are not supported by loopback-ism
should rather be marked "optional" in the struct smcd_ops, and the
calling code should call these only when they are implemented.

Of course this would mean more changes to net/smc/smc_core.c - but
loopback-ism could omit these "boiler-plate" functions.

>  
> +static int smc_lo_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +static int smc_lo_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +static int smc_lo_set_vlan_required(struct smcd_dev *smcd)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +static int smc_lo_reset_vlan_required(struct smcd_dev *smcd)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> +static int smc_lo_signal_event(struct smcd_dev *dev, struct smcd_gid
> *rgid,
> +			       u32 trigger_irq, u32 event_code, u64
> info)
> +{
> +	return 0;
> +}
> +

Just a pattern that I saw elsewhere in the kernel...

Thanks,
Gerd