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Message-ID: <oul3ymxlfwlqc3wikwyfix5e2c7hozwfsdwswkdtayxd2zzphz@mld3uobyw5pv> Date: Fri, 2 Aug 2024 13:02:50 +0300 From: Serge Semin <fancer.lancer@...il.com> To: 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, 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 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 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? * 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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