linux-kernel - Re: [PATCH] priority improvement

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Date:	Fri, 5 Aug 2016 00:21:20 +0300
From:	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:	netdev@...r.kernel.org, mugunthanvnm@...com
Cc:	linux-omap@...r.kernel.org, grygorii.strashko@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] priority improvement


Please, ignore it
It was sent by mistake

On 05.08.16 00:11, Ivan Khoronzhuk wrote:
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> ---
>  drivers/net/ethernet/ti/cpsw.c | 45 +++++++++++++++++-------------------------
>  1 file changed, 18 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 9ddaccc..cd12f52 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -788,22 +788,16 @@ static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget)
>  {
>  	struct cpsw_priv	*priv = napi_to_priv(napi_tx);
>  	int			num_tx, ch;
> -	u32			ch_map;
> +	unsigned long		ch_map;
>
>  	/* process every unprocessed channel */
> -	ch_map = cpdma_ctrl_txchs_state(priv->dma);
> -	for (ch = 0, num_tx = 0; num_tx < budget; ch_map >>= 1, ch++) {
> -		if (!ch_map) {
> -			ch_map = cpdma_ctrl_txchs_state(priv->dma);
> -			if (!ch_map)
> -				break;
> -
> -			ch = 0;
> -		}
> -
> -		if (!(ch_map & 0x01))
> -			continue;
> +	for (num_tx = 0; num_tx < budget;) {
> +		ch_map = cpdma_ctrl_txchs_state(priv->dma);
> +		if (!ch_map)
> +			break;
>
> +		/* process beginning from higher priority queue */
> +		ch = __fls(ch_map);
>  		num_tx += cpdma_chan_process(priv->txch[ch], budget - num_tx);
>  	}
>
> @@ -829,19 +823,13 @@ static int cpsw_rx_poll(struct napi_struct *napi_rx, int budget)
>  	u32			ch_map;
>
>  	/* process every unprocessed channel */
> -	ch_map = cpdma_ctrl_rxchs_state(priv->dma);
> -	for (ch = 0, num_rx = 0; num_rx < budget; ch_map >>= 1, ch++) {
> -		if (!ch_map) {
> -			ch_map = cpdma_ctrl_rxchs_state(priv->dma);
> -			if (!ch_map)
> -				break;
> -
> -			ch = 0;
> -		}
> -
> -		if (!(ch_map & 0x01))
> -			continue;
> +	for (num_rx = 0; num_rx < budget;) {
> +		ch_map = cpdma_ctrl_rxchs_state(priv->dma);
> +		if (!ch_map)
> +			break;
>
> +		/* process beginning from higher priority queue */
> +		ch = __fls(ch_map);
>  		num_rx += cpdma_chan_process(priv->rxch[ch], budget - num_rx);
>  	}
>
> @@ -1130,8 +1118,11 @@ cpsw_tx_queue_mapping(struct cpsw_priv *priv, struct sk_buff *skb)
>  {
>  	unsigned int q_idx = skb_get_queue_mapping(skb);
>
> -	if (q_idx >= priv->tx_ch_num)
> -		q_idx = q_idx % priv->tx_ch_num;
> +	/* cpsw h/w has backward order queue priority, 7 - highest */
> +	if (likely(q_idx < priv->tx_ch_num))
> +		q_idx = priv->tx_ch_num - q_idx - 1;
> +	else
> +		q_idx = 0;
>
>  	return priv->txch[q_idx];
>  }
>

-- 
Regards,
Ivan Khoronzhuk