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dibs: Create class dibs

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Create '/sys/class/dibs' to represent multiple kinds of dibs devices in
sysfs. Show s390/ism devices as well as dibs_loopback devices.

Show attribute fabric_id using dibs_ops.get_fabric_id(). This can help
users understand which dibs devices are connected to the same fabric in
different systems and which dibs devices are loopback devices
(fabric_id 0xffff)

Instead of using the same name as the pci device, give the ism devices
their own readable names based on uid or fid from the HW definition.

smc_loopback was never visible in sysfs. dibs_loopback is now represented
as a virtual device.

For the SMC feature "software defined pnet-id" either the ib device name or
the PCI-ID (actually the parent device name) can be used for SMC-R entries.
Mimic this behaviour for SMC-D, and check the parent device name as well.
So device name or PCI-ID can be used for ism and device name can be used
for dibs-loopback. Note that this:
IB_DEVICE_NAME_MAX - 1 == smc_pnet_policy.[SMC_PNETID_IBNAME].len
is the length of smcd_name. Future SW-pnetid cleanup patches to could use a
meaningful define, but that would touch too much unrelated code here.

Examples:
---------
ism before:
> ls /sys/bus/pci/devices/0000:00:00.0/0000:00:00.0
uevent

ism now:
> ls /sys/bus/pci/devices/0000:00:00.0/dibs/ism30
device -> ../../../0000:00:00.0/
fabric_id
subsystem -> ../../../../../class/dibs/
uevent

dibs loopback:
> ls /sys/devices/virtual/dibs/lo/
fabric_id
subsystem -> ../../../../class/dibs/
uevent

dibs class:
> ls -l /sys/class/dibs/
ism30 -> ../../devices/pci0000:00/0000:00:00.0/dibs/ism30/
lo -> ../../devices/virtual/dibs/lo/

For comparison:
> ls -l /sys/class/net/
enc8410 -> ../../devices/qeth/0.0.8410/net/enc8410/
ens1693 -> ../../devices/pci0001:00/0001:00:00.0/net/ens1693/
lo -> ../../devices/virtual/net/lo/

Signed-off-by: Julian Ruess <julianr@linux.ibm.com>
Co-developed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20250918110500.1731261-10-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Julian Ruess
2025-09-18 13:04:55 +02:00
committed by Paolo Abeni
parent 845c334a01
commit 8047373498
3 changed files with 56 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/dibs/dibs_main.c
View File

@@ -20,6 +20,8 @@
MODULE_DESCRIPTION("Direct Internal Buffer Sharing class");
MODULE_LICENSE("GPL");
static struct class *dibs_class;
/* use an array rather a list for fast mapping: */
static struct dibs_client *clients[MAX_DIBS_CLIENTS];
static u8 max_client;
@@ -105,12 +107,35 @@ struct dibs_dev *dibs_dev_alloc(void)
if (!dibs)
return dibs;
dibs->dev.release = dibs_dev_release;
dibs->dev.class = dibs_class;
device_initialize(&dibs->dev);
return dibs;
}
EXPORT_SYMBOL_GPL(dibs_dev_alloc);
static ssize_t fabric_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dibs_dev *dibs;
u16 fabric_id;
dibs = container_of(dev, struct dibs_dev, dev);
fabric_id = dibs->ops->get_fabric_id(dibs);
return sysfs_emit(buf, "0x%04x\n", fabric_id);
}
static DEVICE_ATTR_RO(fabric_id);
static struct attribute *dibs_dev_attrs[] = {
&dev_attr_fabric_id.attr,
NULL,
};
static const struct attribute_group dibs_dev_attr_group = {
.attrs = dibs_dev_attrs,
};
int dibs_dev_add(struct dibs_dev *dibs)
{
int i, ret;
@@ -119,6 +144,11 @@ int dibs_dev_add(struct dibs_dev *dibs)
if (ret)
return ret;
ret = sysfs_create_group(&dibs->dev.kobj, &dibs_dev_attr_group);
if (ret) {
dev_err(&dibs->dev, "sysfs_create_group failed for dibs_dev\n");
goto err_device_del;
}
mutex_lock(&dibs_dev_list.mutex);
mutex_lock(&clients_lock);
for (i = 0; i < max_client; ++i) {
@@ -130,6 +160,11 @@ int dibs_dev_add(struct dibs_dev *dibs)
mutex_unlock(&dibs_dev_list.mutex);
return 0;
err_device_del:
device_del(&dibs->dev);
return ret;
}
EXPORT_SYMBOL_GPL(dibs_dev_add);
@@ -158,6 +193,10 @@ static int __init dibs_init(void)
memset(clients, 0, sizeof(clients));
max_client = 0;
dibs_class = class_create("dibs");
if (IS_ERR(&dibs_class))
return PTR_ERR(&dibs_class);
rc = dibs_loopback_init();
if (rc)
pr_err("%s fails with %d\n", __func__, rc);
@@ -168,6 +207,7 @@ static int __init dibs_init(void)
static void __exit dibs_exit(void)
{
dibs_loopback_exit();
class_destroy(dibs_class);
}
module_init(dibs_init);