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udev: net_id - suppress function number for single-function devices

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This commit is contained in:
Kay Sievers 2012-11-30 19:27:42 +01:00
parent 2ab38e24e5
commit de892aea1c
1 changed files with 40 additions and 8 deletions
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48
src/udev/udev-builtin-net_id.c
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@ -24,16 +24,20 @@
* ww -- wwan
*
* 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
* 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
*
* example:
* ID_NET_NAME_ONBOARD=eno1
* ID_NET_NAME_SLOT=ens1f0
* ID_NET_NAME_SLOT=ens1
* ID_NET_NAME_SLOT=ens2f0
* ID_NET_NAME_SLOT=ens2f1
* ID_NET_NAME_MAC=enxf0def180d479
* ID_NET_NAME_PATH=enp19s0f0
* ID_NET_NAME_PATH=enp0s25
* ID_NET_NAME_PATH=enp19s3f0
* ID_NET_NAME_PATH=enp19s3f1
*/
#include <stdio.h>
@ -42,6 +46,7 @@
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <linux/pci_regs.h>
#include "udev.h"
@ -77,6 +82,27 @@ static int dev_pci_onboard(struct udev_device *dev, struct udev_device *parent,
return 0;
}
static bool is_pci_singlefunction(struct udev_device *dev) {
char filename[256];
FILE *f;
char config[256];
bool single = false;
snprintf(filename, sizeof(filename), "%s/config", udev_device_get_syspath(dev));
f = fopen(filename, "re");
if (!f)
goto out;
if (fread(&config, sizeof(config), 1, f) != 1)
goto out;
/* bit 0-6 header type, bit 7 multi/single function device */
if ((config[PCI_HEADER_TYPE] & 0x80) == 0)
single = true;
out:
fclose(f);
return single;
}
static int dev_pci_slot(struct udev_device *dev, struct udev_device *parent, const char *prefix, bool test) {
struct udev *udev = udev_device_get_udev(dev);
unsigned int bus;
@ -93,7 +119,10 @@ static int dev_pci_slot(struct udev_device *dev, struct udev_device *parent, con
/* compose a name based on the raw kernel's PCI bus, slot numbers */
if (sscanf(udev_device_get_sysname(parent), "0000:%x:%x.%d", &bus, &slot, &func) != 3)
return -ENOENT;
snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
if (func == 0 && is_pci_singlefunction(parent))
snprintf(str, sizeof(str), "%sp%ds%d", prefix, bus, slot);
else
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;
@ -137,7 +166,10 @@ static int dev_pci_slot(struct udev_device *dev, struct udev_device *parent, con
closedir(dir);
if (hotplug_slot > 0) {
snprintf(str, sizeof(str), "%ss%df%d", prefix, hotplug_slot, func);
if (func == 0 && is_pci_singlefunction(parent))
snprintf(str, sizeof(str), "%ss%d", prefix, hotplug_slot);
else
snprintf(str, sizeof(str), "%ss%df%d", prefix, hotplug_slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
}
out: