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Message-ID: <dkwz2xigkqnly6twu6akseerb3huxet56jultptjlaoapwgdt2@2va3q7isbhne>
Date: Fri, 12 Apr 2024 21:34:20 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yanteng Si <siyanteng@...ngson.cn>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com,
alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com,
chenhuacai@...nel.org, linux@...linux.org.uk, guyinggang@...ngson.cn,
netdev@...r.kernel.org, chris.chenfeiyang@...il.com, siyanteng01@...il.com
Subject: Re: [PATCH net-next v11 0/6] stmmac: Add Loongson platform support
Hi Yanteng
On Fri, Apr 12, 2024 at 07:28:05PM +0800, Yanteng Si wrote:
> v11:
> * Break loongson_phylink_get_caps(), fix bad logic.
> * Remove a unnecessary ";".
> * Remove some unnecessary "{}".
> * add a blank.
> * Move the code of fix _force_1000 to patch 6/6.
>
> The main changes occur in these two functions:
> loongson_dwmac_probe();
> loongson_dwmac_setup();
>
> v10:
> As Andrew's comment:
> * Add a #define for the 0x37.
> * Add a #define for Port Select.
>
> others:
> * Pick Serge's patch, This patch resulted from the process
> of reviewing our patch set.
> * Based on Serge's patch, modify our loongson_phylink_get_caps().
> * Drop patch 3/6, we need mac_interface.
> * Adjusted the code layout of gnet patch.
> * Corrected several errata in commit message.
> * Move DISABLE_FORCE flag to loongson_gnet_data().
>
> v9:
> We have not provided a detailed list of equipment for a long time,
> and I apologize for this. During this period, I have collected some
> information and now present it to you, hoping to alleviate the pressure
> of review.
>
> 1. IP core
> We now have two types of IP cores, one is 0x37, similar to dwmac1000;
> The other is 0x10. Compared to 0x37, we split several DMA registers
> from one to two, and it is not worth adding a new entry for this.
> According to Serge's comment, we made these devices work by overwriting
> priv->synopsys_id = 0x37 and mac->dma = <LS_dma_ops>.
>
> 1.1. Some more detailed information
> The number of DMA channels for 0x37 is 1; The number of DMA channels
> for 0x10 is 8. Except for channel 0, otherchannels do not support
> sending hardware checksums. Supported AV features are Qav, Qat, and Qas,
> and the rest are consistent with 3.73.
>
> 2. DEVICE
> We have two types of devices,
> one is GMAC, which only has a MAC chip inside and needs an external PHY
> chip;
> the other is GNET, which integrates both MAC and PHY chips inside.
>
> 2.1. Some more detailed information
> GMAC device: LS7A1000, LS2K1000, these devices do not support any pause
> mode.
> gnet device: LS7A2000, LS2K2000, the chip connection between the mac and
> phy of these devices is not normal and requires two rounds of
> negotiation; LS7A2000 does not support half-duplex and
> multi-channel;
> to enable multi-channel on LS2K2000, you need to turn off
> hardware checksum.
> **Note**: Only the LS2K2000's IP core is 0x10, while the IP cores of other
> devices are 0x37.
>
> 3. TABLE
>
> device type pci_id ip_core
> ls7a1000 gmac 7a03 0x35/0x37
> ls2k1000 gmac 7a03 0x35/0x37
> ls7a2000 gnet 7a13 0x37
> ls2k2000 gnet 7a13 0x10
> -----------------------------------------------
> Changes:
>
> * passed the CI
> <https://github.com/linux-netdev/nipa/blob/main/tests/patch/checkpatch
> /checkpatch.sh>
> * reverse xmas tree order.
> * Silence build warning.
> * Re-split the patch.
> * Add more detailed commit message.
> * Add more code comment.
> * Reduce modification of generic code.
> * using the GNET-specific prefix.
> * define a new macro for the GNET MAC.
> * Use an easier way to overwrite mac.
> * Removed some useless printk.
>
Thanks you very much for taking my notes into account and resubmitting
the patchset. I'll get back to reviewing your series within 2-5 days.
-Serge(y)
>
> v8:
> * The biggest change is according to Serge's comment in the previous
> edition:
> Seeing the patch in the current state would overcomplicate the generic
> code and the only functions you need to update are
> dwmac_dma_interrupt()
> dwmac1000_dma_init_channel()
> you can have these methods re-defined with all the Loongson GNET
> specifics in the low-level platform driver (dwmac-loongson.c). After
> that you can just override the mac_device_info.dma pointer with a
> fixed stmmac_dma_ops descriptor. Here is what should be done for that:
>
> 1. Keep the Patch 4/9 with my comments fixed. First it will be partly
> useful for your GNET device. Second in general it's a correct
> implementation of the normal DW GMAC v3.x multi-channels feature and
> will be useful for the DW GMACs with that feature enabled.
>
> 2. Create the Loongson GNET-specific
> stmmac_dma_ops.dma_interrupt()
> stmmac_dma_ops.init_chan()
> methods in the dwmac-loongson.c driver. Don't forget to move all the
> Loongson-specific macros from dwmac_dma.h to dwmac-loongson.c.
>
> 3. Create a Loongson GNET-specific platform setup method with the next
> semantics:
> + allocate stmmac_dma_ops instance and initialize it with
> dwmac1000_dma_ops.
> + override the stmmac_dma_ops.{dma_interrupt, init_chan} with
> the pointers to the methods defined in 2.
> + allocate mac_device_info instance and initialize the
> mac_device_info.dma field with a pointer to the new
> stmmac_dma_ops instance.
> + call dwmac1000_setup() or initialize mac_device_info in a way
> it's done in dwmac1000_setup() (the later might be better so you
> wouldn't need to export the dwmac1000_setup() function).
> + override stmmac_priv.synopsys_id with a correct value.
>
> 4. Initialize plat_stmmacenet_data.setup() with the pointer to the
> method created in 3.
>
> * Others:
> Re-split the patch.
> Passed checkpatch.pl test.
>
> v7:
> * Refer to andrew's suggestion:
> - Add DMA_INTR_ENA_NIE_RX and DMA_INTR_ENA_NIE_TX #define's, etc.
>
> * Others:
> - Using --subject-prefix="PATCH net-next vN" to indicate that the
> patches are for the networking tree.
> - Rebase to the latest networking tree:
> <git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git>
>
>
> v6:
>
> * Refer to Serge's suggestion:
> - Add new platform feature flag:
> include/linux/stmmac.h:
> +#define STMMAC_FLAG_HAS_LGMAC BIT(13)
>
> - Add the IRQs macros specific to the Loongson Multi-channels GMAC:
> drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h:
> +#define DMA_INTR_ENA_NIE_LOONGSON 0x00060000 /* ...*/
> #define DMA_INTR_ENA_NIE 0x00010000 /* Normal Summary */
> ...
>
> - Drop all of redundant changes that don't require the
> prototypes being converted to accepting the stmmac_priv
> pointer.
>
> * Refer to andrew's suggestion:
> - Drop white space changes.
> - break patch up into lots of smaller parts.
> Some small patches have been put into another series as a preparation
> see <https://lore.kernel.org/loongarch/cover.1702289232.git.siyanteng@loongson.cn/T/#t>
>
> *note* : This series of patches relies on the three small patches above.
> * others
> - Drop irq_flags changes.
> - Changed patch order.
>
>
> v4 -> v5:
>
> * Remove an ugly and useless patch (fix channel number).
> * Remove the non-standard dma64 driver code, and also remove
> the HWIF entries, since the associated custom callbacks no
> longer exist.
> * Refer to Serge's suggestion: Update the dwmac1000_dma.c to
> support the multi-DMA-channels controller setup.
>
> See:
> v4: <https://lore.kernel.org/loongarch/cover.1692696115.git.chenfeiyang@loongson.cn/>
> v3: <https://lore.kernel.org/loongarch/cover.1691047285.git.chenfeiyang@loongson.cn/>
> v2: <https://lore.kernel.org/loongarch/cover.1690439335.git.chenfeiyang@loongson.cn/>
> v1: <https://lore.kernel.org/loongarch/cover.1689215889.git.chenfeiyang@loongson.cn/>
>
> Serge Semin (1):
> net: stmmac: Move all PHYLINK MAC capabilities initializations to
> MAC-specific setup methods
>
> Yanteng Si (5):
> net: stmmac: Add multi-channel support
> net: stmmac: dwmac-loongson: Use PCI_DEVICE_DATA() macro for device
> identification
> net: stmmac: dwmac-loongson: Introduce GMAC setup
> net: stmmac: dwmac-loongson: Add full PCI support
> net: stmmac: dwmac-loongson: Add Loongson GNET support
>
> drivers/net/ethernet/stmicro/stmmac/common.h | 3 +
> .../ethernet/stmicro/stmmac/dwmac-loongson.c | 544 ++++++++++++++++--
> .../net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 6 +-
> .../ethernet/stmicro/stmmac/dwmac1000_core.c | 2 +
> .../ethernet/stmicro/stmmac/dwmac1000_dma.c | 35 +-
> .../ethernet/stmicro/stmmac/dwmac100_core.c | 2 +
> .../ethernet/stmicro/stmmac/dwmac100_dma.c | 2 +-
> .../net/ethernet/stmicro/stmmac/dwmac4_core.c | 8 +-
> .../net/ethernet/stmicro/stmmac/dwmac4_dma.c | 2 +-
> .../net/ethernet/stmicro/stmmac/dwmac_dma.h | 20 +-
> .../net/ethernet/stmicro/stmmac/dwmac_lib.c | 32 +-
> .../ethernet/stmicro/stmmac/dwxgmac2_core.c | 15 +-
> .../ethernet/stmicro/stmmac/dwxgmac2_dma.c | 2 +-
> drivers/net/ethernet/stmicro/stmmac/hwif.h | 5 +-
> .../ethernet/stmicro/stmmac/stmmac_ethtool.c | 6 +
> .../net/ethernet/stmicro/stmmac/stmmac_main.c | 54 +-
> include/linux/stmmac.h | 2 +
> 17 files changed, 599 insertions(+), 141 deletions(-)
>
> --
> 2.31.4
>
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