linux-kernel - Re: [PATCH net-next v3 05/18] net/smc: reserve CHID range for SMC-D virtual device

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Date:   Fri, 22 Sep 2023 01:32:33 +0200
From:   Wenjia Zhang <wenjia@...ux.ibm.com>
To:     Wen Gu <guwen@...ux.alibaba.com>, kgraul@...ux.ibm.com,
        jaka@...ux.ibm.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com
Cc:     alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 05/18] net/smc: reserve CHID range for SMC-D
 virtual device



On 21.09.23 15:19, Wen Gu wrote:
> This patch reserve CHID range from 0xFF00 to 0xFFFF for SMC-D virtual
> device and introduces helpers to identify them.
> 
> Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
> ---
>   net/smc/smc_ism.h | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
> 
> diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
> index 14d2e77..2ecc8de 100644
> --- a/net/smc/smc_ism.h
> +++ b/net/smc/smc_ism.h
> @@ -15,6 +15,9 @@
>   
>   #include "smc.h"
>   
> +#define SMC_VIRT_ISM_CHID_MAX		0xFFFF
> +#define SMC_VIRT_ISM_CHID_MIN		0xFF00
> +
>   struct smcd_dev_list {	/* List of SMCD devices */
>   	struct list_head list;
>   	struct mutex mutex;	/* Protects list of devices */
> @@ -57,4 +60,16 @@ static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
>   	return rc < 0 ? rc : 0;
>   }
>   
> +static inline bool __smc_ism_is_virtdev(u16 chid)
> +{
> +	return (chid >= SMC_VIRT_ISM_CHID_MIN && chid <= SMC_VIRT_ISM_CHID_MAX);
> +}
> +
> +static inline bool smc_ism_is_virtdev(struct smcd_dev *smcd)
> +{
> +	u16 chid = smcd->ops->get_chid(smcd);
> +
> +	return __smc_ism_is_virtdev(chid);
> +}
> +
I'm wondering if barrier is needed here.
>   #endif