netdev - Re: [PATCH 2/3] net: mhi: Get RX queue size from MHI core

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Date:   Wed, 9 Dec 2020 08:46:34 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Loic Poulain <loic.poulain@...aro.org>, kuba@...nel.org
Cc:     manivannan.sadhasivam@...aro.org, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 2/3] net: mhi: Get RX queue size from MHI core

On 12/9/2020 8:03 AM, Loic Poulain wrote:
> The RX queue size can be determined at runtime by retrieveing the

retrieving

> number of available transfer descriptors
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> ---
>   drivers/net/mhi_net.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
> index 8e72d94..0333e07 100644
> --- a/drivers/net/mhi_net.c
> +++ b/drivers/net/mhi_net.c
> @@ -256,9 +256,6 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
>   	mhi_netdev->mdev = mhi_dev;
>   	SET_NETDEV_DEV(ndev, &mhi_dev->dev);
>   
> -	/* All MHI net channels have 128 ring elements (at least for now) */
> -	mhi_netdev->rx_queue_sz = 128;
> -
>   	INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work);
>   	u64_stats_init(&mhi_netdev->stats.rx_syncp);
>   	u64_stats_init(&mhi_netdev->stats.tx_syncp);
> @@ -268,6 +265,9 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
>   	if (err)
>   		goto out_err;
>   
> +	/* Number of transfer descriptors determines size of the queue */
> +	mhi_netdev->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
> +
>   	err = register_netdev(ndev);
>   	if (err)
>   		goto out_err;
> 


-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.