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udev: net_id - export PCI hotplug slot names

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This commit is contained in:
Kay Sievers 2012-11-26 14:07:16 +01:00
parent c3d2d86d4f
commit 0035597a30
1 changed files with 116 additions and 46 deletions
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160
src/udev/udev-builtin-net_id.c
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@ -18,14 +18,22 @@
***/
/*
* eno<index> -- ethernet on-board
* ID_NET_NAME_FIRMWARE=eno1
* prefixes:
* en -- ethernet
* wl -- wlan
* ww -- wwan
*
* enp<pci bus number>s<slot>f<function> -- physical location/path
* ID_NET_NAME_PATH=enp19s0f0
* types:
* o<index> -- on-board device index
* s<slot>f<function> -- hotplug slot number
* x<MAC> -- MAC address
* p<bus>s<slot>f<function> -- PCI/physical location
*
* enm<MAC address> -- MAC address
* example:
* ID_NET_NAME_ONBOARD=eno1
* ID_NET_NAME_SLOT=ens1f0
* ID_NET_NAME_MAC=enxf0def180d479
* ID_NET_NAME_PATH=enp19s0f0
*/
#include <stdio.h>
@ -37,50 +45,116 @@
#include "udev.h"
static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
struct udev_device *d;
/* retrieve on-board index number and label from firmware */
static int dev_pci_onboard(struct udev_device *dev, const char *prefix, bool test) {
const char *index;
int idx;
const char *label;
char s[16];
int err;
/* ACPI _DSM -- device specific method for naming a PCI or PCI Express device */
index = udev_device_get_sysattr_value(dev, "acpi_index");
/* SMBIOS type 41 -- Onboard Devices Extended Information */
if (!index)
index = udev_device_get_sysattr_value(dev, "index");
if (!index)
return -ENOENT;
idx = strtoul(index, NULL, 0);
if (idx <= 0)
return -EINVAL;
snprintf(s, sizeof(s), "%so%d", prefix, idx);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", s);
if (err < 0)
return err;
label = udev_device_get_sysattr_value(dev, "label");
if (label) {
err = udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", label);
if (err < 0)
return err;
}
return 0;
}
static int dev_pci_slot(struct udev_device *dev, const char *prefix, bool test) {
struct udev *udev = udev_device_get_udev(dev);
unsigned int bus;
unsigned int slot;
unsigned int func;
const char *index;
int err;
struct udev_device *pci = NULL;
char slots[256];
DIR *dir;
struct dirent *dent;
char str[256];
int hotplug_slot = 0;
int err = 0;
/* compose a name based on the raw kernel's PCI bus, slot numbers */
if (sscanf(udev_device_get_sysname(dev), "0000:%x:%x.%d", &bus, &slot, &func) != 3)
return -ENOENT;
snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (err < 0)
return err;
/* ACPI _SUN -- slot user number */
pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
if (!pci) {
err = -ENOENT;
goto out;
}
snprintf(slots, sizeof(slots), "%s/slots", udev_device_get_syspath(pci));
dir = opendir(slots);
if (!dir) {
err = -errno;
goto out;
}
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
int i;
char *rest;
char *address;
if (dent->d_name[0] == '.')
continue;
i = strtol(dent->d_name, &rest, 10);
if (rest[0] != '\0')
continue;
if (i < 1)
continue;
snprintf(str, sizeof(str), "%s/%s/address", slots, dent->d_name);
if (read_one_line_file(str, &address) >= 0) {
/* match slot address with device by stripping the function */
if (strncmp(address, udev_device_get_sysname(dev), strlen(address)) == 0)
hotplug_slot = i;
free(address);
}
if (hotplug_slot > 0)
break;
}
closedir(dir);
if (hotplug_slot > 0) {
snprintf(str, sizeof(str), "%ss%df%d", prefix, hotplug_slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
}
out:
udev_device_unref(pci);
return err;
}
static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
struct udev_device *d;
/* skip other buses than direct PCI parents */
d = udev_device_get_parent(dev);
if (!d || !streq("pci", udev_device_get_subsystem(d)))
return -ENOENT;
/* ACPI _SUN -- slot user number */
index = udev_device_get_sysattr_value(d, "acpi_index");
/* SMBIOS type 41 -- Onboard Devices Extended Information */
if (!index)
index = udev_device_get_sysattr_value(d, "index");
if (index) {
unsigned int idx;
idx = strtoul(index, NULL, 0);
if (idx > 0) {
const char *label;
char s[16];
snprintf(s, sizeof(s), "%so%d", prefix, idx);
udev_builtin_add_property(dev, test, "ID_NET_NAME_FIRMWARE", s);
label = udev_device_get_sysattr_value(d, "label");
if (label)
udev_builtin_add_property(dev, test, "ID_NET_LABEL_FIRMWARE", label);
}
}
/* compose a name based on the PCI bus location */
if (sscanf(udev_device_get_sysname(d), "0000:%x:%x.%d", &bus, &slot, &func) == 3) {
char str[16];
snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (err < 0)
return err;
}
dev_pci_onboard(d, prefix, test);
dev_pci_slot(d, prefix, test);
return 0;
}
@ -89,7 +163,6 @@ static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
unsigned int i;
unsigned int a1, a2, a3, a4, a5, a6;
char str[16];
int err;
/* check for NET_ADDR_PERM, skip random MAC addresses */
s = udev_device_get_sysattr_value(dev, "addr_assign_type");
@ -114,10 +187,7 @@ static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
udev_builtin_hwdb_lookup(dev, str, test);
snprintf(str, sizeof(str), "%sx%x%x%x%x%x%x", prefix, a1, a2, a3, a4, a5, a6);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
if (err < 0)
return err;
return 0;
return udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
}
static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {