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

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Message-ID: <CAHrpEqQHf7wDYhivq9MMY6cqFu73SEQEu+-YhVsyeeKO-An+zw@mail.gmail.com>
Date:	Mon, 15 Sep 2014 10:33:45 -0500
From:	Zhi Li <lznuaa@...il.com>
To:	Lothar Waßmann <LW@...o-electronics.de>
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

On Mon, Sep 15, 2014 at 10:08 AM, Lothar Waßmann <LW@...o-electronics.de> wrote:
> 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?

Sorry, I miss understand your means firstly.
I see now.
You are right.

Because David has applied this patch, I will create a new patch to fix it.

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