netdev - Re: [Patch v4 net-next 04/12] net: fec: parser max queue number from dt file

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Date:	Mon, 15 Sep 2014 17:08:04 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Zhi Li <lznuaa@...il.com>
Cc:	"Frank.Li@...escale.com" <Frank.Li@...escale.com>,
	Duan Fugang-B38611 <b38611@...escale.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Shawn Guo <shawn.guo@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch v4 net-next 04/12] net: fec: parser max queue number
 from dt file

Hi,

Zhi Li wrote:
> On Mon, Sep 15, 2014 at 2:39 AM, Lothar Waßmann <LW@...o-electronics.de> wrote:
> > Hi,
> >
> > Frank.Li@...escale.com wrote:
> >> From: Fugang Duan <B38611@...escale.com>
> >>
> >> By default, the tx/rx queue number is 1, user can config the queue number
> >> at DTS file like this:
> >>       fsl,num-tx-queues=<3>;
> >>       fsl,num-rx-queues=<3>
> >>
> >> Since i.MX6SX enet-AVB IP support multi queues, so use multi queues
> >> interface to allocate and set up an Ethernet device.
> >>
> >> Signed-off-by: Fugang Duan <B38611@...escale.com>
> >> Signed-off-by: Frank Li <Frank.Li@...escale.com>
> >> ---
> >>  drivers/net/ethernet/freescale/fec.h      |  2 ++
> >>  drivers/net/ethernet/freescale/fec_main.c | 46 ++++++++++++++++++++++++++++++-
> >>  2 files changed, 47 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
> >> index b2b91f8..72fb90f 100644
> >> --- a/drivers/net/ethernet/freescale/fec.h
> >> +++ b/drivers/net/ethernet/freescale/fec.h
> >> @@ -356,6 +356,8 @@ struct fec_enet_private {
> >>
> >>       bool ptp_clk_on;
> >>       struct mutex ptp_clk_mutex;
> >> +     unsigned int num_tx_queues;
> >> +     unsigned int num_rx_queues;
> >>
> >>       /* The saved address of a sent-in-place packet/buffer, for skfree(). */
> >>       struct fec_enet_priv_tx_q *tx_queue[FEC_ENET_MAX_TX_QS];
> >> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> >> index 4c0d2ee..2240df0 100644
> >> --- a/drivers/net/ethernet/freescale/fec_main.c
> >> +++ b/drivers/net/ethernet/freescale/fec_main.c
> >> @@ -2709,6 +2709,42 @@ static void fec_reset_phy(struct platform_device *pdev)
> >>  }
> >>  #endif /* CONFIG_OF */
> >>
> >> +static void
> >> +fec_enet_get_queue_num(struct platform_device *pdev, int *num_tx, int *num_rx)
> >> +{
> >> +     struct device_node *np = pdev->dev.of_node;
> >> +     int err;
> >> +
> >> +     *num_tx = *num_rx = 1;
> >> +
> >> +     if (!np || !of_device_is_available(np))
> >> +             return;
> >> +
> >> +     /* parse the num of tx and rx queues */
> >> +     err = of_property_read_u32(np, "fsl,num-tx-queues", num_tx);
> >> +     err |= of_property_read_u32(np, "fsl,num-rx-queues", num_rx);
> >> +     if (err) {
> >> +             *num_tx = 1;
> >> +             *num_rx = 1;
> > Shouldn't these be handled seperately? So that if only one of those
> > properties is given in DT the specified value for that property should
> > be used?
> 
> I worry about asymmetric design in future.
>
Then why do you use two distinct properties in the first place?

> And use two property is the easy debug two directory.
> 
I don't understand this sentence.


Lothar Waßmann
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