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systemd/1023-udev-builtin-net_id-split-out-pci_get_hotplug_slot-a.patch

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systemd-252-43 Resolves: RHEL-50103,RHEL-50651
2024-08-22 08:49:16 +00:00
From 5685910315fb3b6c343db797fef9ef9d6e4ff01e Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 1 Aug 2023 03:27:33 +0900
Subject: [PATCH] udev-builtin-net_id: split-out pci_get_hotplug_slot() and
pci_get_hotplug_slot_from_address()
No functional changes, just refactoring.
(cherry picked from commit f1e3eaa730190a60fdb780be26ee331b8c811e34)
Related: RHEL-50103
---
src/udev/udev-builtin-net_id.c | 199 +++++++++++++++++++--------------
1 file changed, 117 insertions(+), 82 deletions(-)
diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
index 5e76a894f7..16c9971876 100644
--- a/src/udev/udev-builtin-net_id.c
+++ b/src/udev/udev-builtin-net_id.c
@@ -332,14 +332,121 @@ static int parse_hotplug_slot_from_function_id(sd_device *dev, int slots_dirfd,
return 1;
}
-static int dev_pci_slot(sd_device *dev, const LinkInfo *info, NetNames *names) {
- const char *sysname, *attr;
+static int pci_get_hotplug_slot_from_address(
+ sd_device *dev,
+ sd_device *pci,
+ DIR *dir,
+ uint32_t *ret) {
+
+ const char *sysname;
+ int r;
+
+ assert(dev);
+ assert(pci);
+ assert(dir);
+ assert(ret);
+
+ r = sd_device_get_sysname(dev, &sysname);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to get sysname: %m");
+
+ rewinddir(dir);
+ FOREACH_DIRENT_ALL(de, dir, break) {
+ _cleanup_free_ char *path = NULL;
+ const char *address;
+ uint32_t slot;
+
+ if (dot_or_dot_dot(de->d_name))
+ continue;
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ r = safe_atou32(de->d_name, &slot);
+ if (r < 0 || slot <= 0)
+ continue;
+
+ path = path_join("slots", de->d_name, "address");
+ if (!path)
+ return -ENOMEM;
+
+ if (sd_device_get_sysattr_value(pci, path, &address) < 0)
+ continue;
+
+ /* match slot address with device by stripping the function */
+ if (!startswith(sysname, address))
+ continue;
+
+ *ret = slot;
+ return 1; /* found */
+ }
+
+ *ret = 0;
+ return 0; /* not found */
+}
+
+static int pci_get_hotplug_slot(sd_device *dev, uint32_t *ret) {
_cleanup_(sd_device_unrefp) sd_device *pci = NULL;
_cleanup_closedir_ DIR *dir = NULL;
+ int r;
+
+ assert(dev);
+ assert(ret);
+
+ /* ACPI _SUN — slot user number */
+ r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci");
+ if (r < 0)
+ return log_debug_errno(r, "Failed to create sd_device object for pci subsystem: %m");
+
+ r = device_opendir(pci, "slots", &dir);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Cannot open 'slots' subdirectory: %m");
+
+ for (sd_device *slot_dev = dev; slot_dev; ) {
+ uint32_t slot = 0; /* avoid false maybe-uninitialized warning */
+
+ r = parse_hotplug_slot_from_function_id(slot_dev, dirfd(dir), &slot);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *ret = slot;
+ return 1; /* domain should be ignored. */
+ }
+
+ r = pci_get_hotplug_slot_from_address(slot_dev, pci, dir, &slot);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* We found the match between PCI device and slot. However, we won't use the slot
+ * index if the device is a PCI bridge, because it can have other child devices that
+ * will try to claim the same index and that would create name collision. */
+ if (naming_scheme_has(NAMING_BRIDGE_NO_SLOT) && is_pci_bridge(slot_dev)) {
+ if (naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT) && is_pci_multifunction(dev) <= 0)
+ return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ESTALE),
+ "Not using slot information because the PCI device associated with "
+ "the hotplug slot is a bridge and the PCI device has a single function.");
+
+ if (!naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT))
+ return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ESTALE),
+ "Not using slot information because the PCI device is a bridge.");
+ }
+
+ *ret = slot;
+ return 0; /* domain can be still used. */
+ }
+
+ if (sd_device_get_parent_with_subsystem_devtype(slot_dev, "pci", NULL, &slot_dev) < 0)
+ break;
+ }
+
+ return -ENOENT;
+}
+
+static int dev_pci_slot(sd_device *dev, const LinkInfo *info, NetNames *names) {
+ const char *sysname, *attr;
unsigned domain, bus, slot, func;
- sd_device *hotplug_slot_dev;
unsigned long dev_port = 0;
- uint32_t hotplug_slot = 0;
+ uint32_t hotplug_slot = 0; /* avoid false maybe-uninitialized warning */
size_t l;
char *s;
int r;
@@ -410,85 +517,13 @@ static int dev_pci_slot(sd_device *dev, const LinkInfo *info, NetNames *names) {
domain, bus, slot, func, strempty(info->phys_port_name), dev_port,
special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(names->pci_path));
- /* ACPI _SUN — slot user number */
- r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci");
- if (r < 0)
- return log_debug_errno(r, "sd_device_new_from_subsystem_sysname() failed: %m");
-
- r = device_opendir(pci, "slots", &dir);
+ r = pci_get_hotplug_slot(names->pcidev, &hotplug_slot);
if (r < 0)
- return log_device_debug_errno(dev, r, "Cannot access 'slots' subdirectory: %m");
-
- hotplug_slot_dev = names->pcidev;
- while (hotplug_slot_dev) {
- r = parse_hotplug_slot_from_function_id(hotplug_slot_dev, dirfd(dir), &hotplug_slot);
- if (r < 0)
- return 0;
- if (r > 0) {
- domain = 0; /* See comments in parse_hotplug_slot_from_function_id(). */
- break;
- }
-
- r = sd_device_get_sysname(hotplug_slot_dev, &sysname);
- if (r < 0)
- return log_device_debug_errno(hotplug_slot_dev, r, "Failed to get sysname: %m");
-
- FOREACH_DIRENT_ALL(de, dir, break) {
- _cleanup_free_ char *path = NULL;
- const char *address;
- uint32_t i;
-
- if (dot_or_dot_dot(de->d_name))
- continue;
-
- if (de->d_type != DT_DIR)
- continue;
-
- r = safe_atou32(de->d_name, &i);
- if (r < 0 || i <= 0)
- continue;
-
- path = path_join("slots", de->d_name, "address");
- if (!path)
- return -ENOMEM;
-
- if (device_get_sysattr_value_filtered(pci, path, &address) < 0)
- continue;
-
- /* match slot address with device by stripping the function */
- if (!startswith(sysname, address))
- continue;
-
- hotplug_slot = i;
-
- /* We found the match between PCI device and slot. However, we won't use the slot
- * index if the device is a PCI bridge, because it can have other child devices that
- * will try to claim the same index and that would create name collision. */
- if (naming_scheme_has(NAMING_BRIDGE_NO_SLOT) && is_pci_bridge(hotplug_slot_dev)) {
- if (naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT) && is_pci_multifunction(names->pcidev) <= 0) {
- log_device_debug(dev,
- "Not using slot information because the PCI device associated with "
- "the hotplug slot is a bridge and the PCI device has a single function.");
- return 0;
- }
-
- if (!naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT)) {
- log_device_debug(dev, "Not using slot information because the PCI device is a bridge.");
- return 0;
- }
- }
-
- break;
- }
- if (hotplug_slot > 0)
- break;
- if (sd_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL, &hotplug_slot_dev) < 0)
- break;
- rewinddir(dir);
- }
-
- if (hotplug_slot == 0)
- return 0;
+ return r;
+ if (r > 0)
+ /* If the hotplug slot is found through the function ID, then drop the domain from the name.
+ * See comments in parse_hotplug_slot_from_function_id(). */
+ domain = 0;
s = names->pci_slot;
l = sizeof(names->pci_slot);
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