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Message-ID: <li75hdp527xa3k23za3mfnwgwdcs7j324mlqj3qcxto6t5f6mw@yvhnpxlvlt5c>
Date: Thu, 29 Aug 2024 13:52:40 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
Cc: netdev@...r.kernel.org, alexandre.torgue@...s.st.com,
joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, mcoquelin.stm32@...il.com, bcm-kernel-feedback-list@...adcom.com,
richardcochran@...il.com, ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
john.fastabend@...il.com, rmk+kernel@...linux.org.uk, ahalaney@...hat.com,
xiaolei.wang@...driver.com, rohan.g.thomas@...el.com, Jianheng.Zhang@...opsys.com,
linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org, andrew@...n.ch, linux@...linux.org.uk,
horms@...nel.org, florian.fainelli@...adcom.com
Subject: Re: [net-next v4 3/5] net: stmmac: Integrate dw25gmac into stmmac
hwif handling
Hi Jitendra
On Mon, Aug 26, 2024 at 11:53:13AM -0700, Jitendra Vegiraju wrote:
> Hi Serge(y)
> Thank you for reviewing the patch.
>
> On Fri, Aug 23, 2024 at 6:49 AM Serge Semin <fancer.lancer@...il.com> wrote:
> >
> > Hi Jitendra
> >
> > On Wed, Aug 14, 2024 at 03:18:16PM -0700, jitendra.vegiraju@...adcom.com wrote:
> > > From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
> > >
> > > Integrate dw25gmac support into stmmac hardware interface handling.
> > > Added a new entry to the stmmac_hw table in hwif.c.
> > > Define new macros DW25GMAC_CORE_4_00 and DW25GMAC_ID to identify 25GMAC
> > > device.
> > > Since BCM8958x is an early adaptor device, the synopsis_id reported in HW
> > > is 0x32 and device_id is DWXGMAC_ID. Provide override support by defining
> > > synopsys_dev_id member in struct stmmac_priv so that driver specific setup
> > > functions can override the hardware reported values.
> > >
> > > Signed-off-by: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
> > > ---
> > > drivers/net/ethernet/stmicro/stmmac/common.h | 2 ++
> > > drivers/net/ethernet/stmicro/stmmac/hwif.c | 25 ++++++++++++++++++--
> > > drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
> > > 3 files changed, 26 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
> > > index 684489156dce..46edbe73a124 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/common.h
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
> > > @@ -38,9 +38,11 @@
> > > #define DWXGMAC_CORE_2_10 0x21
> > > #define DWXGMAC_CORE_2_20 0x22
> > > #define DWXLGMAC_CORE_2_00 0x20
> > > +#define DW25GMAC_CORE_4_00 0x40
> > >
> > > /* Device ID */
> > > #define DWXGMAC_ID 0x76
> > > +#define DW25GMAC_ID 0x55
> > > #define DWXLGMAC_ID 0x27
> > >
> > > #define STMMAC_CHAN0 0 /* Always supported and default for all chips */
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.c b/drivers/net/ethernet/stmicro/stmmac/hwif.c
> > > index 29367105df54..97e5594ddcda 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/hwif.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/hwif.c
> > > @@ -278,6 +278,27 @@ static const struct stmmac_hwif_entry {
> > > .est = &dwmac510_est_ops,
> > > .setup = dwxlgmac2_setup,
> > > .quirks = stmmac_dwxlgmac_quirks,
> >
> > > + }, {
> > > + .gmac = false,
> > > + .gmac4 = false,
> > > + .xgmac = true,
> > > + .min_id = DW25GMAC_CORE_4_00,
> > > + .dev_id = DW25GMAC_ID,
> > > + .regs = {
> > > + .ptp_off = PTP_XGMAC_OFFSET,
> > > + .mmc_off = MMC_XGMAC_OFFSET,
> > > + .est_off = EST_XGMAC_OFFSET,
> > > + },
> > > + .desc = &dwxgmac210_desc_ops,
> > > + .dma = &dw25gmac400_dma_ops,
> > > + .mac = &dwxgmac210_ops,
> > > + .hwtimestamp = &stmmac_ptp,
> > > + .mode = NULL,
> > > + .tc = &dwmac510_tc_ops,
> > > + .mmc = &dwxgmac_mmc_ops,
> > > + .est = &dwmac510_est_ops,
> > > + .setup = dwxgmac2_setup,
> > > + .quirks = NULL,
> > > },
> >
> > This can be replaced with just:
> >
> > + }, {
> > + .gmac = false,
> > + .gmac4 = false,
> > + .xgmac = true,
> > + .min_id = DW25GMAC_CORE_4_00,
> > + .dev_id = DWXGMAC_ID, /* Early DW 25GMAC IP-core had XGMAC ID */
> > + .regs = {
> > + .ptp_off = PTP_XGMAC_OFFSET,
> > + .mmc_off = MMC_XGMAC_OFFSET,
> > + .est_off = EST_XGMAC_OFFSET,
> > + },
> > + .desc = &dwxgmac210_desc_ops,
> > + .dma = &dw25gmac400_dma_ops,
> > + .mac = &dwxgmac210_ops,
> > + .hwtimestamp = &stmmac_ptp,
> > + .mode = NULL,
> > + .tc = &dwmac510_tc_ops,
> > + .mmc = &dwxgmac_mmc_ops,
> > + .est = &dwmac510_est_ops,
> > + .setup = dw25gmac_setup,
> > + .quirks = NULL,
> > }
> >
> > and you won't need to pre-define the setup() method in the
> > glue driver. Instead you can define a new dw25xgmac_setup() method in
> > the dwxgmac2_core.c as it's done for the DW XGMAC/LXGMAC IP-cores.
> >
> > Note if your device is capable to work with up to 10Gbps speed, then
> > just set the plat_stmmacenet_data::max_speed field to SPEED_10000.
> > Alternatively if you really need to specify the exact MAC
> > capabilities, then you can implement what Russell suggested here
> > sometime ago:
> > https://lore.kernel.org/netdev/Zf3ifH%2FCjyHtmXE3@shell.armlinux.org.uk/
> >
> I like your suggestion to add one stmmac_hw[] array entry (entry_a) for this
> "early release" DW25GMAC IP and another entry (entry_b) for final DW25MAC
> IP, in the process eliminate the need for a new member variable in struct
> stmmac_priv.
>
> However, I would like to bring to your attention that this device requires
> special handling for both synopsys_id and dev_id.
> This device is reporting 0x32 for synopsys_id and 0x76(XGMAC) for dev_id.
> The final 25GMAC spec will have 0x40 for synopsys_id and 0x55(25GMAC) for
> dev_id.
For some reason I was thinking that your device had only the device ID
pre-defined with the XGMAC value meanwhile the Synopsys ID was 0x40.
Indeed you get to override both of these data in the platform-specific
setup() method.
>
> So, in order to avoid falsely qualifying other XGMAC devices with
> synopsis_id >=0x32 as DW25GMAC, I am thinking we will have to overwrite the
> synopsys_id to 0x40 (DW25GMAC_CORE_4_00) in glue driver using existing
> glue driver override mechanism.
>
> We can implement dw25gmac_setup() in dwxgmac2_core.c for generic 25GMAC
> case. But, this glue driver will have to rely on its own setup function
> to override the synopsys_id as DW25GMAC_CORE_4_00.
>
> Do you think it looks reasonable?
What I was trying to avoid was the setup() method re-definition just
for the sake of the IP-core version override. Because if not for that
you could have created and used the generic DW 25GMAC dw25gmac_setup()
function.
One of the possible solutions I was thinking was to introduce the
plat_stmmacenet_data::{snps_id,dev_id} fields and use their values in
the stmmac_hwif_init() procedure instead of the data read from the
MAC.VERSION CSR.
Another solution could be to add the plat_stmmacenet_data::has_25gmac
field and fix the generic driver code to using it where it's relevant.
Then you won't need to think about what actual Synopsys ID/Device ID
since it would mean a whole new IP-core.
-Serge(y)
> If yes, do you want me to add the generic 25GMAC stmmac_hw[] entry
> ("entry_b") now or when
> such a device becomes available for testing?
>
> > If you also have a DW 25GMAC-based device with 0x55 device ID, then
> > just add another stmmac_hw[] array entry.
> >
>
> > > };
> > >
> > > int hw_cap_support;
> > > int synopsys_id;
> >
> > > + int synopsys_dev_id;
> >
> > With the suggestion above implemented you won't need this.
>
> Got it. Thanks.
>
> >
> > -Serge(y)
> >
> > > u32 msg_enable;
> > > int wolopts;
> > > int wol_irq;
> > > --
> > > 2.34.1
> > >
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