xref: /kernel/linux/linux-6.6/Documentation/networking/device_drivers/qlogic/qlge.rst

.. SPDX-License-Identifier: GPL-2.0

=======================================
QLogic QLGE 10Gb Ethernet device driver
=======================================

This driver use drgn and devlink for debugging.

Dump kernel data structures in drgn
-----------------------------------

To dump kernel data structures, the following Python script can be used
in drgn:

.. code-block:: python

	def align(x, a):
	    """the alignment a should be a power of 2
	    """
	    mask = a - 1
	    return (x+ mask) & ~mask

	def struct_size(struct_type):
	    struct_str = "struct {}".format(struct_type)
	    return sizeof(Object(prog, struct_str, address=0x0))

	def netdev_priv(netdevice):
	    NETDEV_ALIGN = 32
	    return netdevice.value_() + align(struct_size("net_device"), NETDEV_ALIGN)

	name = 'xxx'
	qlge_device = None
	netdevices = prog['init_net'].dev_base_head.address_of_()
	for netdevice in list_for_each_entry("struct net_device", netdevices, "dev_list"):
	    if netdevice.name.string_().decode('ascii') == name:
	        print(netdevice.name)

	ql_adapter = Object(prog, "struct ql_adapter", address=netdev_priv(qlge_device))

The struct ql_adapter will be printed in drgn as follows,

    >>> ql_adapter
    (struct ql_adapter){
            .ricb = (struct ricb){
                    .base_cq = (u8)0,
                    .flags = (u8)120,
                    .mask = (__le16)26637,
                    .hash_cq_id = (u8 [1024]){ 172, 142, 255, 255 },
                    .ipv6_hash_key = (__le32 [10]){},
                    .ipv4_hash_key = (__le32 [4]){},
            },
            .flags = (unsigned long)0,
            .wol = (u32)0,
            .nic_stats = (struct nic_stats){
                    .tx_pkts = (u64)0,
                    .tx_bytes = (u64)0,
                    .tx_mcast_pkts = (u64)0,
                    .tx_bcast_pkts = (u64)0,
                    .tx_ucast_pkts = (u64)0,
                    .tx_ctl_pkts = (u64)0,
                    .tx_pause_pkts = (u64)0,
                    ...
            },
            .active_vlans = (unsigned long [64]){
                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 52780853100545, 18446744073709551615,
                    18446619461681283072, 0, 42949673024, 2147483647,
            },
            .rx_ring = (struct rx_ring [17]){
                    {
                            .cqicb = (struct cqicb){
                                    .msix_vect = (u8)0,
                                    .reserved1 = (u8)0,
                                    .reserved2 = (u8)0,
                                    .flags = (u8)0,
                                    .len = (__le16)0,
                                    .rid = (__le16)0,
                                    ...
                            },
                            .cq_base = (void *)0x0,
                            .cq_base_dma = (dma_addr_t)0,
                    }
                    ...
            }
    }

coredump via devlink
--------------------


And the coredump obtained via devlink in json format looks like,

.. code:: shell

	$ devlink health dump show DEVICE reporter coredump -p -j
	{
	    "Core Registers": {
	        "segment": 1,
	        "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
	    },
	    "Test Logic Regs": {
	        "segment": 2,
	        "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
	    },
	    "RMII Registers": {
	        "segment": 3,
	        "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
	    },
	    ...
	    "Sem Registers": {
	        "segment": 50,
	        "values": [ 0,0,0,0 ]
	    }
	}

When the module parameter qlge_force_coredump is set to be true, the MPI
RISC reset before coredumping. So coredumping will much longer since
devlink tool has to wait for 5 secs for the resetting to be
finished.