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Date: Thu, 3 Mar 2016 03:16:01 +0900
From: Yoshihiro Kaneko <ykaneko0929@...il.com>
To: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Simon Horman <horms@...ge.net.au>,
Magnus Damm <magnus.damm@...il.com>,
linux-renesas-soc@...r.kernel.org,
Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH/RFC v6 net-next] ravb: Add dma queue interrupt support
2016-03-01 5:30 GMT+09:00 Sergei Shtylyov <sergei.shtylyov@...entembedded.com>:
> Hello.
>
>
> On 02/28/2016 06:41 PM, Yoshihiro Kaneko wrote:
>
>> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>>
>> This patch supports the following interrupts.
>>
>> - One interrupt for multiple (timestamp, error, gPTP)
>> - One interrupt for emac
>> - Four interrupts for dma queue (best effort rx/tx, network control rx/tx)
>>
>> This patch improve efficiency of the interrupt handler by adding the
>> interrupt handler corresponding to each interrupt source described
>> above. Additionally, it reduces the number of times of the access to
>> EthernetAVB IF.
>> Also this patch prevent this driver depends on the whim of a boot loader.
>>
>> [ykaneko0929@...il.com: define bit names of registers]
>> [ykaneko0929@...il.com: add comment for gen3 only registers]
>> [ykaneko0929@...il.com: fix coding style]
>> [ykaneko0929@...il.com: update changelog]
>> [ykaneko0929@...il.com: gen3: fix initialization of interrupts]
>> [ykaneko0929@...il.com: gen3: fix clearing interrupts]
>> [ykaneko0929@...il.com: gen3: add helper function for request_irq()]
>> [ykaneko0929@...il.com: gen3: remove IRQF_SHARED flag for request_irq()]
>> [ykaneko0929@...il.com: revert ravb_close() and ravb_ptp_stop()]
>> [ykaneko0929@...il.com: avoid calling free_irq() to non-hooked interrupts]
>> [ykaneko0929@...il.com: make NC/BE interrupt handler a function]
>> [ykaneko0929@...il.com: make timestamp interrupt handler a function]
>> [ykaneko0929@...il.com: timestamp interrupt is handled in multiple
>> interrupt handler instead of dma queue interrupt handler]
>> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@...il.com>
>
>
> OK, you are very close now! Just a few comments...
>
> [...]
>>
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
>> b/drivers/net/ethernet/renesas/ravb_main.c
>> index c936682..22ef65d 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>
> [...]
>>
>> @@ -697,6 +726,47 @@ static void ravb_error_interrupt(struct net_device
>> *ndev)
>> }
>> }
>>
>> +static bool ravb_queue_interrupt(struct net_device *ndev, int q,
>> + u32 ris0, u32 *ric0, u32 tis, u32 *tic)
>> +{
>> + struct ravb_private *priv = netdev_priv(ndev);
>> +
>
>
> Perhaps it makes sense to read the RI[CS]0/TI[CS] here instead of passing
> them (by reference)?
OK, I will do.
>
> [...]
>
>> @@ -714,42 +784,21 @@ static irqreturn_t ravb_interrupt(int irq, void
>> *dev_id)
>> u32 ric0 = ravb_read(ndev, RIC0);
>> u32 tis = ravb_read(ndev, TIS);
>> u32 tic = ravb_read(ndev, TIC);
>> - int q;
>>
>> /* Timestamp updated */
>> - if (tis & TIS_TFUF) {
>> - ravb_write(ndev, ~TIS_TFUF, TIS);
>> - ravb_get_tx_tstamp(ndev);
>> + if (ravb_timestamp_interrupt(ndev, tis))
>> result = IRQ_HANDLED;
>> - }
>>
>> /* Network control and best effort queue RX/TX */
>> - for (q = RAVB_NC; q >= RAVB_BE; q--) {
>> - if (((ris0 & ric0) & BIT(q)) ||
>> - ((tis & tic) & BIT(q))) {
>> - if (napi_schedule_prep(&priv->napi[q])) {
>> - /* Mask RX and TX interrupts */
>> - ric0 &= ~BIT(q);
>> - tic &= ~BIT(q);
>> - ravb_write(ndev, ric0, RIC0);
>> - ravb_write(ndev, tic, TIC);
>> - __napi_schedule(&priv->napi[q]);
>> - } else {
>> - netdev_warn(ndev,
>> - "ignoring interrupt,
>> rx status 0x%08x, rx mask 0x%08x,\n",
>> - ris0, ric0);
>> - netdev_warn(ndev,
>> - "
>> tx status 0x%08x, tx mask 0x%08x.\n",
>> - tis, tic);
>> - }
>> - result = IRQ_HANDLED;
>> - }
>> - }
>> + if (ravb_queue_interrupt(ndev, RAVB_NC, ris0, &ric0, tis,
>> &tic))
>> + result = IRQ_HANDLED;
>> + if (ravb_queue_interrupt(ndev, RAVB_BE, ris0, &ric0, tis,
>> &tic))
>> + result = IRQ_HANDLED;
>
>
> Hmm, perhaps unrolling wasn't such a great idea... we can't use || here
> as it would be short-circuited. :-(
>
> [...]
>>
>> +static irqreturn_t ravb_rx_tx_interrupt(int irq, void *dev_id, int
>> ravb_queue)
>
>
> Please, please shorten this 'ravb_queue'...
I will fix it.
> Also, would make sense to rename it to ravb_dma_interrupt()...
I have renamed it from ravb_dmaq_interrupt() in this version as you
suggested in the previous review. Did you not mean it?
>
> [...]
>
> Unfortunately, I still can't do a full gen2 regression testing as both
> Alt and Porter boards don't work with the recent kernel due to AVB_MDIO
> stuck at 1... But perhaps such testing isn't even necessary.
>
> MBR, Sergei
>
Thanks,
kaneko
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