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Message-ID: <CAMdnO-JKfi0hqaR5zrzzv6j-c6OhH-LTZT5WWBCFDOG_+ZxTeQ@mail.gmail.com> Date: Fri, 2 Aug 2024 15:06:05 -0700 From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com> To: Serge Semin <fancer.lancer@...il.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, 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: [PATCH net-next v3 0/3] net: stmmac: Add PCI driver support for BCM8958x On Fri, Aug 2, 2024 at 3:02 AM Serge Semin <fancer.lancer@...il.com> wrote: > > Hi Jitendra > > On Thu, Aug 01, 2024 at 08:18:19PM -0700, jitendra.vegiraju@...adcom.com wrote: > > From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com> > > > > This patchset adds basic PCI ethernet device driver support for Broadcom > > BCM8958x Automotive Ethernet switch SoC devices. > > > > This SoC device has PCIe ethernet MAC attached to an integrated ethernet > > switch using XGMII interface. The PCIe ethernet controller is presented to > > the Linux host as PCI network device. > > > > The following block diagram gives an overview of the application. > > +=================================+ > > | Host CPU/Linux | > > +=================================+ > > || PCIe > > || > > +==========================================+ > > | +--------------+ | > > | | PCIE Endpoint| | > > | | Ethernet | | > > | | Controller | | > > | | DMA | | > > | +--------------+ | > > | | MAC | BCM8958X | > > | +--------------+ SoC | > > | || XGMII | > > | || | > > | +--------------+ | > > | | Ethernet | | > > | | switch | | > > | +--------------+ | > > | || || || || | > > +==========================================+ > > || || || || More external interfaces > > > > The MAC block on BCM8958x is based on Synopsis XGMAC 4.00a core. This > > driver uses common dwxgmac2 code where applicable. > > Thanks for submitting the series. > > I am curious how come Broadcom got to use an IP-core which hasn't > been even announced by Synopsys. AFAICS the most modern DW XGMAC > IP-core is of v3.xxa version: > > https://www.synopsys.com/dw/ipdir.php?ds=dwc_ether_xgmac > I am not sure why the 4.00a IP-code is not announced for general availability yet. The Synopsis documentation for this IP mentions 3.xx IP as reference for this design and lists new features for 4.00a. > Are you sure that your device isn't equipped with some another DW MAC > IP-core, like DW 25G Ethernet MAC? (which BTW is equipped with a new > Hyper DMA engine with a capability to have up to 128/256 channels with > likely indirect addressing.) Do I miss something? > Yes, I briefly mentioned the new DMA architecture in the commit log for patch 1/3. You are correct, the name for the new DMA engine is Hyper DMA. It probably started with some 3.xx IP-Core. This DW-MAC is capable of 25G, but this SOC is not using 25G support. > * I'll join the patch set review after the weekend, sometime on the > next week. > > -Serge(y) > > > Driver functionality specific to this MAC is implemented in dwxgmac4.c. > > Management of integrated ethernet switch on this SoC is not handled by > > the PCIe interface. > > This SoC device has PCIe ethernet MAC directly attached to an integrated > > ethernet switch using XGMII interface. > > > > v2->v3: > > Addressed v2 comments from Andrew, Jakub, Russel and Simon. > > Based on suggestion by Russel and Andrew, added software node to create > > phylink in fixed-link mode. > > Moved dwxgmac4 specific functions to new files dwxgmac4.c and dwxgmac4.h > > in stmmac core module. > > Reorganized the code to use the existing glue logic support for xgmac in > > hwif.c and override ops functions for dwxgmac4 specific functions. > > The patch is split into three parts. > > Patch#1 Adds dma_ops for dwxgmac4 in stmmac core > > Patch#2 Hooks in the hardware interface handling for dwxgmac4 > > Patch#3 Adds PCI driver for BCM8958x device > > > > v1->v2: > > Minor fixes to address coding style issues. > > Sent v2 too soon by mistake, without waiting for review comments. > > Received feedback on this version. > > https://lore.kernel.org/netdev/20240511015924.41457-1-jitendra.vegiraju@broadcom.com/ > > > > v1: > > https://lore.kernel.org/netdev/20240510000331.154486-1-jitendra.vegiraju@broadcom.com/ > > > > Jitendra Vegiraju (3): > > Add basic dwxgmac4 support to stmmac core > > Integrate dwxgmac4 into stmmac hwif handling > > Add PCI driver support for BCM8958x > > > > MAINTAINERS | 8 + > > drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 + > > drivers/net/ethernet/stmicro/stmmac/Makefile | 3 +- > > drivers/net/ethernet/stmicro/stmmac/common.h | 4 + > > .../net/ethernet/stmicro/stmmac/dwmac-brcm.c | 517 ++++++++++++++++++ > > .../ethernet/stmicro/stmmac/dwxgmac2_dma.c | 31 ++ > > .../net/ethernet/stmicro/stmmac/dwxgmac4.c | 142 +++++ > > .../net/ethernet/stmicro/stmmac/dwxgmac4.h | 84 +++ > > drivers/net/ethernet/stmicro/stmmac/hwif.c | 26 +- > > drivers/net/ethernet/stmicro/stmmac/hwif.h | 1 + > > 10 files changed, 825 insertions(+), 2 deletions(-) > > create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-brcm.c > > create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxgmac4.c > > create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxgmac4.h > > > > -- > > 2.34.1 > > > >
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