netdev - Re: [PATCH 5/6] can: c_can: prepare to up the message objects number

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Message-ID: <20210225072306.wdxtzbpowuorhxlp@pengutronix.de>
Date:   Thu, 25 Feb 2021 08:23:06 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/6] can: c_can: prepare to up the message objects number


Hey Dario,

just a quick note...

On 24.02.2021 23:52:45, Dario Binacchi wrote:
> -struct net_device *alloc_c_can_dev(void)
> +struct net_device *alloc_c_can_dev(int msg_obj_num)
>  {
>  	struct net_device *dev;
>  	struct c_can_priv *priv;
> +	int msg_obj_tx_num = msg_obj_num / 2;
>  
> -	dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM);
> +	dev = alloc_candev(sizeof(struct c_can_priv), msg_obj_tx_num);
>  	if (!dev)
>  		return NULL;
>  
>  	priv = netdev_priv(dev);
> -	netif_napi_add(dev, &priv->napi, c_can_poll, C_CAN_NAPI_WEIGHT);
> +	priv->msg_obj_num = msg_obj_num;
> +	priv->msg_obj_rx_num = msg_obj_num - msg_obj_tx_num;
> +	priv->msg_obj_rx_first = 1;
> +	priv->msg_obj_rx_last =
> +		priv->msg_obj_rx_first + priv->msg_obj_rx_num - 1;
> +	priv->msg_obj_rx_mask = ((u64)1 << priv->msg_obj_rx_num) - 1;
> +
> +	priv->msg_obj_tx_num = msg_obj_tx_num;
> +	priv->msg_obj_tx_first = priv->msg_obj_rx_last + 1;
> +	priv->msg_obj_tx_last =
> +		priv->msg_obj_tx_first + priv->msg_obj_tx_num - 1;
> +
> +	priv->dlc = kcalloc(msg_obj_tx_num, sizeof(*priv->dlc), GFP_KERNEL);

You can pass a larger size to alloc_candev() so that it includes the mem
you allocate here.

> +	if (!priv->dlc) {
> +		free_candev(dev);
> +		return NULL;
> +	}
> +
> +	netif_napi_add(dev, &priv->napi, c_can_poll, priv->msg_obj_rx_num);

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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