net: hibmcge: Add register dump supported in this module

The dump register is an effective way to analyze problems.

To ensure code flexibility, each register contains the type,
offset, and value information. The ethtool does the pretty print
based on these information.

The driver can dynamically add or delete registers that need to be dumped
in the future because information such as type and offset is contained.
ethtool always can do pretty print.

With the ethtool of a specific version,
the following effects are achieved:
[root@localhost sjj]# ./ethtool -d enp131s0f1
[SPEC] VALID                    [0x0000]: 0x00000001
[SPEC] EVENT_REQ                [0x0004]: 0x00000000
[SPEC] MAC_ID                   [0x0008]: 0x00000002
[SPEC] PHY_ADDR                 [0x000c]: 0x00000002
[SPEC] MAC_ADDR_L               [0x0010]: 0x00000808
[SPEC] MAC_ADDR_H               [0x0014]: 0x08080802
[SPEC] UC_MAX_NUM               [0x0018]: 0x00000004
[SPEC] MAX_MTU                  [0x0028]: 0x00000fc2
[SPEC] MIN_MTU                  [0x002c]: 0x00000100
[SPEC] TX_FIFO_NUM              [0x0030]: 0x00000040
[SPEC] RX_FIFO_NUM              [0x0034]: 0x0000007f
[SPEC] VLAN_LAYERS              [0x0038]: 0x00000002
[MDIO] COMMAND_REG              [0x0000]: 0x0000185f
[MDIO] ADDR_REG                 [0x0004]: 0x00000000
[MDIO] WDATA_REG                [0x0008]: 0x0000a000
[MDIO] RDATA_REG                [0x000c]: 0x00000000
[MDIO] STA_REG                  [0x0010]: 0x00000000
[GMAC] DUPLEX_TYPE              [0x0008]: 0x00000001
[GMAC] FD_FC_TYPE               [0x000c]: 0x00008808
[GMAC] FC_TX_TIMER              [0x001c]: 0x000000ff
[GMAC] FD_FC_ADDR_LOW           [0x0020]: 0xc2000001
[GMAC] FD_FC_ADDR_HIGH          [0x0024]: 0x00000180
[GMAC] MAX_FRM_SIZE             [0x003c]: 0x000005f6
[GMAC] PORT_MODE                [0x0040]: 0x00000002
[GMAC] PORT_EN                  [0x0044]: 0x00000006
...

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241216040532.1566229-5-shaojijie@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>