linux-kernel - Re: [PATCH v2 2/2] RDMA/rxe: Call rxe_set_mtu after rxe_register

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Date:   Sat, 16 Sep 2023 10:28:06 +0800
From:   Zhu Yanjun <yanjun.zhu@...ux.dev>
To:     Li Zhijian <lizhijian@...itsu.com>, linux-rdma@...r.kernel.org
Cc:     zyjzyj2000@...il.com, jgg@...pe.ca, leon@...nel.org,
        linux-kernel@...r.kernel.org, rpearsonhpe@...il.com,
        Daisuke Matsuda <matsuda-daisuke@...itsu.com>
Subject: Re: [PATCH v2 2/2] RDMA/rxe: Call rxe_set_mtu after
 rxe_register_device

在 2023/8/23 14:11, Li Zhijian 写道:
> rxe_set_mtu() will call rxe_info_dev() to print message, and
> rxe_info_dev() expects dev_name(rxe->ib_dev->dev) has been assigned.
> 
> Previously since dev_name() is not set, when a new rxe link is being
> added, 'null' will be used as the dev_name like:
> 
> "(null): rxe_set_mtu: Set mtu to 1024"
> 
> Move rxe_register_device() earlier to assign the correct dev_name
> so that it can be read by rxe_set_mtu() later.
> 
> And it's safe to do such change since mtu will not be used during the
> rxe_register_device()
> 
> After this change, message becomes:
> "rxe_eth0: rxe_set_mtu: Set mtu to 4096"
> 
> Reviewed-by: Daisuke Matsuda <matsuda-daisuke@...itsu.com>
> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>

In rxe_register_device function, the correct dev_name is assigned.
So the rxe_info_dev in rxe_set_mtu can use the correct dev_name.
I am fine with it.

It seems that it is a trivial problem. If the Fixes tag is added, then 
we can know which commit introduces this problem, it is better.

Reviewed-by: Zhu Yanjun <yanjun.zhu@...ux.dev>

Thanks,
Zhu Yanjun

> ---
>   drivers/infiniband/sw/rxe/rxe.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
> index a086d588e159..8a43c0c4f8d8 100644
> --- a/drivers/infiniband/sw/rxe/rxe.c
> +++ b/drivers/infiniband/sw/rxe/rxe.c
> @@ -169,10 +169,13 @@ void rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
>    */
>   int rxe_add(struct rxe_dev *rxe, unsigned int mtu, const char *ibdev_name)
>   {
> +	int ret;
> +
>   	rxe_init(rxe);
> +	ret = rxe_register_device(rxe, ibdev_name);
>   	rxe_set_mtu(rxe, mtu);
>   
> -	return rxe_register_device(rxe, ibdev_name);
> +	return ret;
>   }
>   
>   static int rxe_newlink(const char *ibdev_name, struct net_device *ndev)