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Message-ID: <OS0PR01MB59229DB46113038EEFA1A81886129@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date: Thu, 15 Jul 2021 06:49:43 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Sergei Shtylyov <sergei.shtylyov@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
CC: Geert Uytterhoeven <geert+renesas@...der.be>,
Sergey Shtylyov <s.shtylyov@...russia.ru>,
Adam Ford <aford173@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Yuusuke Ashizuka <ashiduka@...itsu.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org"
<linux-renesas-soc@...r.kernel.org>,
Chris Paterson <Chris.Paterson2@...esas.com>,
Biju Das <biju.das@...renesas.com>,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH/RFC 1/2] ravb: Preparation for supporting Gigabit Ethernet
driver
Hello Sergei Shtylyov,
Thanks for the feedback.
> Subject: Re: [PATCH/RFC 1/2] ravb: Preparation for supporting Gigabit
> Ethernet driver
>
> Hello!
>
> On 7/14/21 5:54 PM, Biju Das wrote:
>
> > The DMAC and EMAC blocks of Gigabit Ethernet IP is almost similar to
> > Ethernet AVB. With few canges in driver we can support both the IP.
> > This patch is in preparation for supporting the same.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> [...]
> > diff --git a/drivers/net/ethernet/renesas/ravb.h
> > b/drivers/net/ethernet/renesas/ravb.h
> > index 86a1eb0634e8..80e62ca2e3d3 100644
> > --- a/drivers/net/ethernet/renesas/ravb.h
> > +++ b/drivers/net/ethernet/renesas/ravb.h
> > @@ -864,7 +864,7 @@ enum GECMR_BIT {
> >
> > /* The Ethernet AVB descriptor definitions. */ struct ravb_desc {
> > - __le16 ds; /* Descriptor size */
> > + __le16 ds; /* Descriptor size */
>
> Oops! But this should be a matter of the seperate patch if you want to
> fix whitespace...
OK. Will send as separate patch.
>
> [...]
> > diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> > b/drivers/net/ethernet/renesas/ravb_main.c
> > index 4afff320dfd0..7e6feda59f4a 100644
> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> > @@ -217,6 +217,29 @@ static int ravb_tx_free(struct net_device *ndev,
> > int q, bool free_txed_only) }
> >
> > /* Free skb's and DMA buffers for Ethernet AVB */
> > +static void ravb_ring_free_ex(struct net_device *ndev, int q)
>
> What does _ex() suffix mean (seems rather poor chice)? Perhaps rx would
> be better?
The rationale behind suffix "_ex" is "extend" the existing function to support both AVB and Gigabit ethernet IP.
>
> > +{
> > + struct ravb_private *priv = netdev_priv(ndev);
> > + int ring_size;
> > + int i;
> > +
> > + for (i = 0; i < priv->num_rx_ring[q]; i++) {
> > + struct ravb_ex_rx_desc *desc = &priv->rx_ring[q][i];
> > +
> > + if (!dma_mapping_error(ndev->dev.parent,
> > + le32_to_cpu(desc->dptr)))
> > + dma_unmap_single(ndev->dev.parent,
> > + le32_to_cpu(desc->dptr),
> > + RX_BUF_SZ,
> > + DMA_FROM_DEVICE);
> > + }
> > + ring_size = sizeof(struct ravb_ex_rx_desc) *
> > + (priv->num_rx_ring[q] + 1);
> > + dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
> > + priv->rx_desc_dma[q]);
> > + priv->rx_ring[q] = NULL;
> > +}
> > +
> > static void ravb_ring_free(struct net_device *ndev, int q) {
> > struct ravb_private *priv = netdev_priv(ndev);
> [...]
> > @@ -272,26 +281,15 @@ static void ravb_ring_free(struct net_device
> > *ndev, int q) }
> >
> > /* Format skb and descriptor buffer for Ethernet AVB */ -static void
> > ravb_ring_format(struct net_device *ndev, int q)
> > +static void ravb_ring_format_ex(struct net_device *ndev, int q)
>
> Again, what the _ex suffix mean?
>
> [..]
> > @@ -396,7 +414,7 @@ static int ravb_ring_init(struct net_device *ndev,
> > int q) }
> >
> > /* E-MAC init function */
> > -static void ravb_emac_init(struct net_device *ndev)
> > +static void ravb_emac_init_ex(struct net_device *ndev)
>
> Same question for the 3rd time... :-)
>
> [...]
> > @@ -422,29 +440,15 @@ static void ravb_emac_init(struct net_device
> *ndev)
> > ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP,
> > ECSIPR); }
> >
> > +static void ravb_emac_init(struct net_device *ndev) {
> > + ravb_emac_init_ex(ndev);
>
> Hm, looks pretty useless...
Will make this as a separate single factorisation patch supporting both IP's. So that
Reviewing will be easier.
>
> > +}
> > +
> > /* Device init function for Ethernet AVB */ -static int
> > ravb_dmac_init(struct net_device *ndev)
> > +static void ravb_dmac_init_ex(struct net_device *ndev)
>
> 4th _ex...
>
> [...]
> > @@ -532,7 +561,7 @@ static void ravb_rx_csum(struct sk_buff *skb) }
> >
> > /* Packet receive function for Ethernet AVB */ -static bool
> > ravb_rx(struct net_device *ndev, int *quota, int q)
> > +static bool ravb_rx_ex(struct net_device *ndev, int *quota, int q)
> > {
> > struct ravb_private *priv = netdev_priv(ndev);
> > int entry = priv->cur_rx[q] % priv->num_rx_ring[q]; @@ -647,6
> > +676,11 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int
> q)
> > return boguscnt <= 0;
> > }
> >
> > +static bool ravb_rx(struct net_device *ndev, int *quota, int q) {
> > + return ravb_rx_ex(ndev, quota, q);
> > +}
> > +
>
> Looks pretty useless...
OK. Will make this as a separate single factorisation patch supporting both IP's. So that
Reviewing will be easier.
>
> [...]
> > @@ -920,7 +954,7 @@ static int ravb_poll(struct napi_struct *napi, int
> budget)
> > if (ravb_rx(ndev, "a, q))
> > goto out;
> >
> > - /* Processing RX Descriptor Ring */
> > + /* Processing TX Descriptor Ring */
>
> Hm, looka like a missing comment fix from the patch refactoring
> ravb_poll()...
OK. Will send this as separate patch.
>
> [...]
> > @@ -2059,17 +2094,22 @@ static int ravb_probe(struct platform_device
> *pdev)
> > if (!ndev)
> > return -ENOMEM;
> >
> > + /* The Ether-specific entries in the device structure. */
> > + ndev->base_addr = res->start;
> > +
> > + chip_id = (enum ravb_chip_id)of_device_get_match_data(&pdev->dev);
> > +
> > + SET_NETDEV_DEV(ndev, &pdev->dev);
> > +
> > + priv = netdev_priv(ndev);
> > + priv->chip_id = chip_id;
> > +
> > ndev->features = NETIF_F_RXCSUM;
> > ndev->hw_features = NETIF_F_RXCSUM;
> >
> > pm_runtime_enable(&pdev->dev);
> > pm_runtime_get_sync(&pdev->dev);
> >
> > - /* The Ether-specific entries in the device structure. */
> > - ndev->base_addr = res->start;
> > -
> > - chip_id = (enum ravb_chip_id)of_device_get_match_data(&pdev->dev);
> > -
>
> What does that hunk achieve?
RZ/G2L ethernet needs to de-assert the reset(in case bootloader didn't dessert). In that case
Clocks need to be turned on after that.
>
> > if (chip_id == RCAR_GEN3)
> > irq = platform_get_irq_byname(pdev, "ch22");
> > else
> [...]
> > @@ -2257,7 +2292,7 @@ static int ravb_remove(struct platform_device
> *pdev)
> > struct ravb_private *priv = netdev_priv(ndev);
> >
> > /* Stop PTP Clock driver */
> > - if (priv->chip_id != RCAR_GEN2)
> > + if (priv->chip_id == RCAR_GEN3)
> > ravb_ptp_stop(ndev);
> >
> > clk_disable_unprepare(priv->refclk);
> > @@ -2362,7 +2397,7 @@ static int __maybe_unused ravb_resume(struct
> device *dev)
> > /* Request GTI loading */
> > ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> >
> > - if (priv->chip_id != RCAR_GEN2)
> > + if (priv->chip_id == RCAR_GEN3)
> > ravb_set_delay_mode(ndev);
>
> Probably, all those chip_id check fixes deserve a patch of their own...
OK. Agreed, since the delays are specifics to GEN3.
Regards,
Biju
>
> MBR, Sergei
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