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![David Thompson](/assets/img/avatar_default.png)
This patch adds build and driver logic for the "mlxbf_gige" Ethernet driver from Mellanox Technologies. The second generation BlueField SoC from Mellanox supports an out-of-band GigaBit Ethernet management port to the Arm subsystem. This driver supports TCP/IP network connectivity for that port, and provides back-end routines to handle basic ethtool requests. The driver interfaces to the Gigabit Ethernet block of BlueField SoC via MMIO accesses to registers, which contain control information or pointers describing transmit and receive resources. There is a single transmit queue, and the port supports transmit ring sizes of 4 to 256 entries. There is a single receive queue, and the port supports receive ring sizes of 32 to 32K entries. The transmit and receive rings are allocated from DMA coherent memory. There is a 16-bit producer and consumer index per ring to denote software ownership and hardware ownership, respectively. The main driver logic such as probe(), remove(), and netdev ops are in "mlxbf_gige_main.c". Logic in "mlxbf_gige_rx.c" and "mlxbf_gige_tx.c" handles the packet processing for receive and transmit respectively. The logic in "mlxbf_gige_ethtool.c" supports the handling of some basic ethtool requests: get driver info, get ring parameters, get registers, and get statistics. The logic in "mlxbf_gige_mdio.c" is the driver controlling the Mellanox BlueField hardware that interacts with a PHY device via MDIO/MDC pins. This driver does the following: - At driver probe time, it configures several BlueField MDIO parameters such as sample rate, full drive, voltage and MDC - It defines functions to read and write MDIO registers and registers the MDIO bus. - It defines the phy interrupt handler reporting a link up/down status change - This driver's probe is invoked from the main driver logic while the phy interrupt handler is registered in ndo_open. Driver limitations - Only supports 1Gbps speed - Only supports GMII protocol - Supports maximum packet size of 2KB - Does not support scatter-gather buffering Testing - Successful build of kernel for ARM64, ARM32, X86_64 - Tested ARM64 build on FastModels & Palladium - Tested ARM64 build on several Mellanox boards that are built with the BlueField-2 SoC. The testing includes coverage in the areas of networking (e.g. ping, iperf, ifconfig, route), file transfers (e.g. SCP), and various ethtool options relevant to this driver. Signed-off-by: David Thompson <davthompson@nvidia.com> Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com> Reviewed-by: Liming Sun <limings@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
27 lines
842 B
Text
27 lines
842 B
Text
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Mellanox driver configuration
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#
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config NET_VENDOR_MELLANOX
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bool "Mellanox devices"
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default y
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depends on PCI || I2C
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help
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If you have a network (Ethernet or RDMA) device belonging to this
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class, say Y.
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Note that the answer to this question doesn't directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about Mellanox cards. If you say Y, you will be asked
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for your specific card in the following questions.
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if NET_VENDOR_MELLANOX
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source "drivers/net/ethernet/mellanox/mlx4/Kconfig"
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source "drivers/net/ethernet/mellanox/mlx5/core/Kconfig"
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source "drivers/net/ethernet/mellanox/mlxsw/Kconfig"
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source "drivers/net/ethernet/mellanox/mlxfw/Kconfig"
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source "drivers/net/ethernet/mellanox/mlxbf_gige/Kconfig"
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endif # NET_VENDOR_MELLANOX
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