netdev - RE: [PATCH net-next V2 13/16] net: fec: print more debug info in fec

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Date:	Fri, 4 Mar 2016 10:06:18 +0000
From:	Fugang Duan <fugang.duan@....com>
To:	Troy Kisky <troy.kisky@...ndarydevices.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"b38611@...escale.com" <b38611@...escale.com>
CC:	"fabio.estevam@...escale.com" <fabio.estevam@...escale.com>,
	"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"tremyfr@...il.com" <tremyfr@...il.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"laci@...ndarydevices.com" <laci@...ndarydevices.com>,
	"shawnguo@...nel.org" <shawnguo@...nel.org>,
	"johannes@...solutions.net" <johannes@...solutions.net>,
	"stillcompiling@...il.com" <stillcompiling@...il.com>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: RE: [PATCH net-next V2 13/16] net: fec: print more debug info in
 fec_timeout

From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Thursday, February 25, 2016 8:37 AM
> To: netdev@...r.kernel.org; davem@...emloft.net; b38611@...escale.com
> Cc: fabio.estevam@...escale.com; l.stach@...gutronix.de; andrew@...n.ch;
> tremyfr@...il.com; linux@....linux.org.uk; linux-arm-
> kernel@...ts.infradead.org; laci@...ndarydevices.com; shawnguo@...nel.org;
> johannes@...solutions.net; stillcompiling@...il.com;
> sergei.shtylyov@...entembedded.com; arnd@...db.de; Troy Kisky
> <troy.kisky@...ndarydevices.com>
> Subject: [PATCH net-next V2 13/16] net: fec: print more debug info in
> fec_timeout
> 
> Print the current interrupt flags and mask and the interrupt state during the last
> interrupt in fec_timeout.
> 
> Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
> ---
>  drivers/net/ethernet/freescale/fec.h      | 1 +
>  drivers/net/ethernet/freescale/fec_main.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/freescale/fec.h
> b/drivers/net/ethernet/freescale/fec.h
> index 001200b..615cca1 100644
> --- a/drivers/net/ethernet/freescale/fec.h
> +++ b/drivers/net/ethernet/freescale/fec.h
> @@ -506,6 +506,7 @@ struct fec_enet_private {
>  	unsigned int total_tx_ring_size;
>  	unsigned int total_rx_ring_size;
>  	uint	events;
> +	uint	last_ievents;
> 
>  	struct	platform_device *pdev;
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index afd4060..9a3136b 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1107,6 +1107,9 @@ fec_timeout(struct net_device *ndev)
>  	int i;
>  	uint events = 0;
> 
> +	pr_err("%s: last=%x %x, mask %x\n", __func__, fep->last_ievents,
> +	       readl(fep->hwp + FEC_IEVENT), readl(fep->hwp + FEC_IMASK));
> +
pr_err() -> netdev_err()

I don't want the debug patch enter to the driver.

>  	for (i = 0; i < fep->num_tx_queues; i++) {
>  		struct fec_enet_priv_tx_q *txq = fep->tx_queue[i];
>  		int index;
> @@ -1514,6 +1517,7 @@ fec_enet_interrupt(int irq, void *dev_id)
> 
>  	if (!int_events)
>  		return IRQ_NONE;
> +	fep->last_ievents = int_events;
> 
>  	if (int_events & (FEC_ENET_RXF | FEC_ENET_TXF)) {
>  		if (napi_schedule_prep(&fep->napi)) {
> --
> 2.5.0