1. 官方介绍
stmmac which is the official driver for Synopsys Ethernet QoS 10/100/1000 and QoS
IP in Linux. The cstmmac driver was originally developed by STMicroelectronics, one of Synopsys
Ethernet IP customers, supporting MAC 10/100/1000. The source code for cstmmac driver can
be found in Linux Kernel under the folder cdrivers/net/ethernet/stmicro/stmmac
As an open source project, the driver started receiving new features and bug fixes and started
being adopted by other Synopsys Ethernet IP clients. Finally, in 2016 the QoS IP support was
added to the driver.
The stmmac driver has an architecture that increases hardware/IP abstraction as we go up through the layers.
Starting from the bottom layer, each IP has its isolated ecosystem consisting of a core (MAC
related operations), DMA (DMA related operations), DESCS (descriptor related operations) and
common libs blocks. In the case of MAC 10/100 and MAC 1000, they share the same lib file,
because they have a set of common registers and operations.
The stmmac driver supports two types of socket buffers: ring and chain. Each implementation
is done in ring_mode and chain_mode files. For the common MAC Management Counters
(MMC) operations, the driver has the mmc_core file that includes all the necessary operations
for this purpose.
The middle layer is the common layer for all the IPs. Based on configuration, this layer will
choose the IP block to use. The main file is stmmac_main where the programmer can find the
typical Ethernet driver functions like *_open(), *_xmit() and other relevant ones.
stmmac_main is the maestro of stmmac , picking each block operations (MDIO, PTP,
Ethtool and IP functions) and putting them in a common operational flow.
The upper layer is composed by stmmac_platform and stmmac_pci files. The platform
related file contains a wide set of device tree parsing functions serving as a common device tree
interpreter for all specific-platform drivers (top layer). The PCI related file is an end-use glue
driver, to be used when this type of bus is needed.
In the top layer we can find a generic driver and a set of custom platform glue drivers that
implement operations related to a certain SoC. All these drivers typically use Release dwc_enet_qos_software_5.10a
stmmac_platform device tree parsing features and then call stmmac_main methods to
follow the normal flow.
In order to add support for Ethernet QoS 5.xx IP Cores a new file was introduced ( dwmac5 )
which implements all the relevant configuration and handling of 5.xx features. For TSN
functions stmmac_tsn was introduced, serving as interface with the TSN subsystem.
2. driver path
linux-linaro-stable-lsk/drivers/net/ethernet/stmicro/stmmac
3. dwmac5
kernel4.14只支持dwmac-4.1，kernel 4.17开始支持dwmac-5.10，即eqos5.1，具体如下：
