Re: [PATCH net-next v6 01/11] net/smc: decouple ism_client from SMC-D DMB registration

[Wen Gu]

On 2024/4/15 16:41, Alexandra Winter wrote:
> On 14.04.24 06:02, Wen Gu wrote:
> > The struct 'ism_client' is specialized for s390 platform firmware ISM.
> > So replace it with 'void' to make SMCD DMB registration helper generic
> > for both Emulated-ISM and existing ISM.
> >
> > Signed-off-by: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
> > ---
>
> Just a thought:
> The client concept is really specific to s390 platform firmware ISM.
> So wouldn't it be nice to do something like:
>
> diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
> index 78cca4839a31..37dcdf2bc044 100644
> --- a/drivers/s390/net/ism_drv.c
> +++ b/drivers/s390/net/ism_drv.c
> @@ -747,10 +747,9 @@ static int smcd_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
>          return ism_query_rgid(smcd->priv, rgid->gid, vid_valid, vid);
>   }
>
> -static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
> -                            struct ism_client *client)
> +static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
>   {
> -       return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, client);
> +       return ism_register_dmb(smcd->priv, (struct ism_dmb *)dmb, &smc_ism_client);
>   }
>
>   static int smcd_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
>
> --------------
>
> This is not a real patch, just a sketch, but I hope you
> get the idea.
>
>
> This may be a step in the direction of moving the ism_client concept from
> net/smc/smc_ism.c to drivers/s390/net/ism*
>
>
> I know that there are several dependencies to consider.

Yeah.. I think so too. The move of ism_client concept may involve much work.

> And I haven't looked at the other patches in this series yet in detail, to see how you solve
> things like smcd_register_dev. Seems like smcd_register_dmb() is the only one of the smcd_ops
> that you need for loopback and uses ism_client.

loopback-ism uses smcd_lo_register_dev instead. And yes, smcd_register_dmb() is
the only one of smcd_ops that use ism_client in its function argument.

> Wenjia, Gerd, and others what do you think?