netdev - Re: [PATCH] net: bcmgenet: fix uncleaned dma flags

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Message-Id: <D93181E5-EDC1-4192-B8EA-7209646DA963@gmail.com>
Date:	Fri, 21 Aug 2015 10:12:21 +0900
From:	Jaedon Shin <jaedon.shin@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Petri Gynther <pgynther@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: bcmgenet: fix uncleaned dma flags

> 2015. 8. 21., 오전 7:04, Florian Fainelli <f.fainelli@...il.com> 작성:
> 
> On 19/08/15 20:17, Jaedon Shin wrote:
>> Clean the dma flags of multiq ring buffer int the interface stop
>> process. This patch fixes that the genet is not running while the
>> interface is re-enabled.
>> 
>> $ ifup eth0 - running after booting
>> $ ifdown eth0
>> $ ifup eth0 - not running and occur tx_timeout
>> 
>> The bcmgenet_dma_disable() in bcmgenet_open() do clean ring16 dma flag
>> only. If the genet has multiq, the dma register is not cleaned. and
>> bcmgenet_init_dma() is not done correctly. in case
>> GENET_V2(tx_queues=4), tdma_ctrl has 0x1e after running
>> bcmgenet_dma_disable().
> 
> It sounds like this should be moved to bcmgenet_dma_disable() where we
> are already modifying DMA_CTRL and returning a dma_ctrl value back to
> the caller, or at the very last bcmgenet_dma_teardown().
> 
> Thanks!
> 

I will send the changes immediately.

Thanks.

>> 
>> Signed-off-by: Jaedon Shin <jaedon.shin@...il.com>
>> ---
>> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 16 ++++++++++++++++
>> 1 file changed, 16 insertions(+)
>> 
>> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> index 64c1e9db6b0b..81bde6fa70b7 100644
>> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> @@ -2174,6 +2174,8 @@ static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
>> 
>> static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
>> {
>> +	u32 dma_ctrl;
>> +	u32 reg;
>> 	int i;
>> 
>> 	bcmgenet_fini_rx_napi(priv);
>> @@ -2182,6 +2184,20 @@ static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
>> 	/* disable DMA */
>> 	bcmgenet_dma_teardown(priv);
>> 
>> +	dma_ctrl = 0;
>> +	for (i = 0; i < priv->hw_params->rx_queues; i++)
>> +		dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
>> +	reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
>> +	reg &= ~dma_ctrl;
>> +	bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
>> +
>> +	dma_ctrl = 0;
>> +	for (i = 0; i < priv->hw_params->tx_queues; i++)
>> +		dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
>> +	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
>> +	reg &= ~dma_ctrl;
>> +	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
>> +
>> 	for (i = 0; i < priv->num_tx_bds; i++) {
>> 		if (priv->tx_cbs[i].skb != NULL) {
>> 			dev_kfree_skb(priv->tx_cbs[i].skb);
>> 
> 
> 
> -- 
> Florian

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