linux-kernel - Re: [PATCH 1/1] net: macb: remove BUG_ON() and reset the queue to handle RX errors

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Message-ID: <56F42FC1.6000008@cogentembedded.com>
Date:	Thu, 24 Mar 2016 21:19:45 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	nicolas.ferre@...el.com, davem@...emloft.net,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	soren.brinkmann@...inx.com, narmstrong@...libre.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] net: macb: remove BUG_ON() and reset the queue to
 handle RX errors

Hello.

On 03/24/2016 05:37 PM, Cyrille Pitchen wrote:

> This patch removes two BUG_ON() used to notify about RX queue corruptions
> on macb (not gem) hardware without actually handling the error.
>
> The new code skips corrupted frames but still processes faultless frames.
> Then it resets the RX queue before restarting the reception from a clean
> state.
>
> This patch is a rework of an older patch proposed by Neil Armstrong:
> http://patchwork.ozlabs.org/patch/371525/
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
> ---
>   drivers/net/ethernet/cadence/macb.c | 59 ++++++++++++++++++++++++++++++-------
>   1 file changed, 49 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 6619178ed77b..39447a337149 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
[...]
> @@ -945,11 +948,26 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
>   	return 0;
>   }
>
> +static inline void macb_init_rx_ring(struct macb *bp)
> +{
> +	int i;
> +	dma_addr_t addr;

    DaveM prefers that longer declarations precede the shorter.

[...]
>   static int macb_rx(struct macb *bp, int budget)
>   {
>   	int received = 0;
>   	unsigned int tail;
>   	int first_frag = -1;
> +	int reset_rx_queue = 0;

    *bool*, please.

[...]

MBR, Sergei