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| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2022-04-13 10:21:55 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-04-14 09:42:09 +0200 |
| commit | d64486483505cf01fb4b4d141b33fcb0b90ee1e9 (patch) | |
| tree | dda3fece408c83cc183859afb4196b544a207e0c /include | |
| parent | beb75db10e4991a6e0c1a9ac625770a36ff44080 (diff) | |
| download | barebox-d64486483505cf01fb4b4d141b33fcb0b90ee1e9.tar.gz barebox-d64486483505cf01fb4b4d141b33fcb0b90ee1e9.tar.xz | |
net: add DSA framework to support basic switch functionality
Add DSA based port multiplexing functionality for barebox. With this
framework we will be able to use different ports of as switch
separately.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.barebox.org/20220413082205.429509-5-o.rempel@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/dsa.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/include/dsa.h b/include/dsa.h new file mode 100644 index 0000000000..75a939f2cb --- /dev/null +++ b/include/dsa.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2019-2021 NXP + */ + +#ifndef __DSA_H__ +#define __DSA_H__ + +#include <linux/phy.h> +#include <net.h> + +/** + * DSA stands for Distributed Switch Architecture and it is infrastructure + * intended to support drivers for Switches that rely on an intermediary + * Ethernet device for I/O. These switches may support cascading allowing + * them to be arranged as a tree. + * DSA is documented in detail in the Linux kernel documentation under + * Documentation/networking/dsa/dsa.txt + * The network layout of such a switch is shown below: + * + * |------| + * | eth0 | <--- master eth device (regular eth driver) + * |------| + * ^ | + * tag added by switch -->| | + * | | + * | |<-- tag added by DSA driver + * | v + * |--------------------------------------| + * | | CPU port | | <-- DSA (switch) device + * | ------------ | (DSA driver) + * | _________ _________ _________ | + * | | port0 | | port1 | ... | portn | | <-- ports as eth devices + * |-+-------+--+-------+-------+-------+-| ('dsa-port' eth driver) + * + */ + +#define DSA_MAX_PORTS 12 +#define DSA_PKTSIZE 1538 + +struct dsa_port; +struct dsa_switch; + +struct dsa_ops { + int (*port_probe)(struct dsa_port *dp, int port, + phy_interface_t phy_mode); + int (*port_pre_enable)(struct dsa_port *dp, int port, + phy_interface_t phy_mode); + int (*port_enable)(struct dsa_port *dp, int port, + struct phy_device *phy); + void (*port_disable)(struct dsa_port *dp, int port, + struct phy_device *phy); + int (*xmit)(struct dsa_port *dp, int port, void *packet, int length); + int (*rcv)(struct dsa_switch *ds, int *portp, void *packet, int length); + + int (*phy_read)(struct dsa_switch *ds, int port, int regnum); + int (*phy_write)(struct dsa_switch *ds, int port, int regnum, u16 val); +}; + +struct dsa_port { + struct device_d dev; + struct dsa_switch *ds; + unsigned int index; + struct eth_device edev; + unsigned char *rx_buf; + size_t rx_buf_length; + bool enabled; +}; + +struct dsa_switch { + struct device_d *dev; + const struct dsa_ops *ops; + size_t num_ports; + u32 cpu_port; + int cpu_port_users; + struct eth_device *edev_master; + struct phy_device *cpu_port_fixed_phy; + struct dsa_port *dp[DSA_MAX_PORTS]; + size_t needed_headroom; + size_t needed_rx_tailroom; + size_t needed_tx_tailroom; + void *tx_buf; + struct mii_bus *slave_mii_bus; + u32 phys_mii_mask; +}; + +int dsa_register_switch(struct dsa_switch *ds); +u32 dsa_user_ports(struct dsa_switch *ds); + +#endif /* __DSA_H__ */ |