netdev - Re: [PATCH net-next v2 04/15] net/smc: Add link counters for IB device ports

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Date:   Tue, 03 Nov 2020 16:52:16 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Karsten Graul <kgraul@...ux.ibm.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        hca@...ux.ibm.com, raspl@...ux.ibm.com
Subject: Re: [PATCH net-next v2 04/15] net/smc: Add link counters for IB
 device ports

On Tue, 2020-11-03 at 11:25 +0100, Karsten Graul wrote:
> From: Guvenc Gulce <guvenc@...ux.ibm.com>
> 
> Add link counters to the structure of the smc ib device, one counter
> per
> ib port. Increase/decrease the counters as needed in the
> corresponding
> routines.
> 
> Signed-off-by: Guvenc Gulce <guvenc@...ux.ibm.com>
> Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
> ---
>  net/smc/smc_core.c | 3 +++
>  net/smc/smc_ib.h   | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
> index 6e2077161267..da94725deb09 100644
> --- a/net/smc/smc_core.c
> +++ b/net/smc/smc_core.c
> @@ -316,6 +316,7 @@ int smcr_link_init(struct smc_link_group *lgr,
> struct smc_link *lnk,
>  	lnk->link_idx = link_idx;
>  	lnk->smcibdev = ini->ib_dev;
>  	lnk->ibport = ini->ib_port;
> +	atomic_inc(&ini->ib_dev->lnk_cnt_by_port[ini->ib_port - 1]);
>  	lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port -
> 1].active_mtu;
>  	atomic_set(&lnk->conn_cnt, 0);
>  	smc_llc_link_set_uid(lnk);
> @@ -360,6 +361,7 @@ int smcr_link_init(struct smc_link_group *lgr,
> struct smc_link *lnk,
>  	smc_llc_link_clear(lnk, false);
>  out:
>  	put_device(&ini->ib_dev->ibdev->dev);
> +	atomic_dec(&ini->ib_dev->lnk_cnt_by_port[ini->ib_port - 1]);
>  	memset(lnk, 0, sizeof(struct smc_link));
>  	lnk->state = SMC_LNK_UNUSED;
>  	if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
> @@ -750,6 +752,7 @@ void smcr_link_clear(struct smc_link *lnk, bool
> log)
>  	smc_ib_dealloc_protection_domain(lnk);
>  	smc_wr_free_link_mem(lnk);
>  	put_device(&lnk->smcibdev->ibdev->dev);
> +	atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);

this repeats 3 times at least in this patch and hard to read, can you
make a macro or static function to hide the details

Maybe: 
SMC_IBDEV_CNT_{INC/DEC}(lnk->smcibdev);

>  	smcibdev = lnk->smcibdev;
>  	memset(lnk, 0, sizeof(struct smc_link));
>  	lnk->state = SMC_LNK_UNUSED;
> diff --git a/net/smc/smc_ib.h b/net/smc/smc_ib.h
> index 2ce481187dd0..3e6bfeddd53b 100644
> --- a/net/smc/smc_ib.h
> +++ b/net/smc/smc_ib.h
> @@ -53,6 +53,7 @@ struct smc_ib_device {				
> /* ib-device infos for smc */
>  	atomic_t		lnk_cnt;	/* number of links on ibdev
> */
>  	wait_queue_head_t	lnks_deleted;	/* wait 4 removal of all
> links*/
>  	struct mutex		mutex;		/* protect dev
> setup+cleanup */
> +	atomic_t		lnk_cnt_by_port[SMC_MAX_PORTS];/*#lnk per
> port*/

missing spaces around comment text.


>