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systemd/1024-udev-builtin-net_id-use-firmware_node-sun-for-ID_NET.patch
Lukas Nykryn 79df79b44e systemd-252-43 
Resolves: RHEL-50103,RHEL-50651
2024-08-22 10:49:16 +02:00

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From 7af151ca282d506a8e409a68b656f6d1cd2f13fb Mon Sep 17 00:00:00 2001
From: Etienne Champetier <e.champetier@ateme.com>
Date: Tue, 9 Jul 2024 11:53:50 -0400
Subject: [PATCH] udev-builtin-net_id: use firmware_node/sun for
ID_NET_NAME_SLOT
pci_get_hotplug_slot() has the following limitations:
- if slots are not hotpluggable, they are not in /sys/bus/pci/slots.
- the address at /sys/bus/pci/slots/X/addr doesn't contains the function part,
so on some system, 2 different slots with different _SUN end up with the same
hotplug_slot, leading to naming conflicts.
- it tries all parent devices until it finds a slot number, which is incorrect,
and what led to NAMING_BRIDGE_MULTIFUNCTION_SLOT being disabled.
The use of PCI hotplug to find the slot (ACPI _SUN) was introduced in
https://github.com/systemd/systemd/commit/0035597a30d120f70df2dd7da3d6128fb8ba6051
"udev: net_id - export PCI hotplug slot names" on 2012/11/26.
At the same time on the kernel side we got
https://github.com/torvalds/linux/commit/bb74ac23b10820d8722c3e1f4add9ef59e703f63
"ACPI: create _SUN sysfs file" on 2012/11/16.
Using PCI hotplug was the only way at the time, but now 12 years later we can use
firmware_node/sun sysfs file.
Looking at a small selection of server HW, for HPE (Gen10 DL325), the _SUN is attached
to the NIC device, whereas for Dell (R640/R6515/R6615) and Cisco (UCSC-C220-M5SX),
the _SUN is on the first parent pcieport.
We still fallback to pci_get_hotplug_slot() to handle the s390 case and
maybe some other coner cases (_SUN on grand parent device that is not a
bridge ?).
(cherry picked from commit 0a4ecc54cb9f2d3418b970c51bfadb69c34ae9eb)
Resolves: RHEL-50103
---
man/systemd.net-naming-scheme.xml | 5 ++-
src/shared/netif-naming-scheme.h | 3 +-
src/udev/udev-builtin-net_id.c | 66 +++++++++++++++++++++++++++----
3 files changed, 64 insertions(+), 10 deletions(-)
diff --git a/man/systemd.net-naming-scheme.xml b/man/systemd.net-naming-scheme.xml
index 83293e5636..c9a7e1e493 100644
--- a/man/systemd.net-naming-scheme.xml
+++ b/man/systemd.net-naming-scheme.xml
@@ -510,9 +510,10 @@
to distinguish between devices. However, name conflict can occur if these devices are not
children of the same PCI bridge, e.g. there are multiple PCI bridges in the same slot.
</para>
+
+ <para>PCI slot number is now read from <constant>firmware_node/sun</constant> sysfs file.</para>
</listitem>
</varlistentry>
-
</variablelist>
<para>By default <constant>rhel-9.0</constant> is used.</para>
@@ -666,7 +667,7 @@ ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
</example>
<example>
- <title>PCI Ethernet card in hotplug slot with firmware index number</title>
+ <title>PCI Ethernet card in slot with firmware index number</title>
<programlisting># /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
ID_NET_NAME_MAC=enx000000000466
diff --git a/src/shared/netif-naming-scheme.h b/src/shared/netif-naming-scheme.h
index 5bc071f8db..b1ac2e4320 100644
--- a/src/shared/netif-naming-scheme.h
+++ b/src/shared/netif-naming-scheme.h
@@ -42,6 +42,7 @@ typedef enum NamingSchemeFlags {
* This is disabled since rhel-9.5, as it seems not to work at least for some setups. See upstream issue #28929. */
NAMING_DEVICETREE_ALIASES = 1 << 15, /* Generate names from devicetree aliases */
NAMING_SR_IOV_R = 1 << 17, /* Use "r" suffix for SR-IOV VF representors */
+ NAMING_FIRMWARE_NODE_SUN = 1 << 18, /* Use firmware_node/sun to get PCI slot number */
/* And now the masks that combine the features above */
NAMING_V238 = 0,
@@ -73,7 +74,7 @@ typedef enum NamingSchemeFlags {
NAMING_RHEL_9_2 = NAMING_RHEL_9_0,
NAMING_RHEL_9_3 = NAMING_RHEL_9_0 | NAMING_SR_IOV_R,
NAMING_RHEL_9_4 = NAMING_RHEL_9_3,
- NAMING_RHEL_9_5 = NAMING_RHEL_9_4 & ~NAMING_BRIDGE_MULTIFUNCTION_SLOT,
+ NAMING_RHEL_9_5 = (NAMING_RHEL_9_4 & ~NAMING_BRIDGE_MULTIFUNCTION_SLOT) | NAMING_FIRMWARE_NODE_SUN,
EXTRA_NET_NAMING_SCHEMES
diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
index 16c9971876..291fb4ba36 100644
--- a/src/udev/udev-builtin-net_id.c
+++ b/src/udev/udev-builtin-net_id.c
@@ -442,6 +442,51 @@ static int pci_get_hotplug_slot(sd_device *dev, uint32_t *ret) {
return -ENOENT;
}
+static int get_device_firmware_node_sun(sd_device *dev, uint32_t *ret) {
+ const char *attr;
+ int r;
+
+ assert(dev);
+ assert(ret);
+
+ r = device_get_sysattr_value_filtered(dev, "firmware_node/sun", &attr);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to read firmware_node/sun, ignoring: %m");
+
+ r = safe_atou32(attr, ret);
+ if (r < 0)
+ return log_device_warning_errno(dev, r, "Failed to parse firmware_node/sun '%s', ignoring: %m", attr);
+
+ return 0;
+}
+
+static int pci_get_slot_from_firmware_node_sun(sd_device *dev, uint32_t *ret) {
+ int r;
+ sd_device *slot_dev;
+
+ assert(dev);
+ assert(ret);
+
+ /* Try getting the ACPI _SUN for the device */
+ if (get_device_firmware_node_sun(dev, ret) >= 0)
+ return 0;
+
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "pci", NULL, &slot_dev);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to find pci parent, ignoring: %m");
+
+ if (is_pci_bridge(slot_dev) && is_pci_multifunction(dev) <= 0)
+ return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ESTALE),
+ "Not using slot information because the parent pcieport "
+ "is a bridge and the PCI device is not multifunction.");
+
+ /* Try getting the ACPI _SUN from the parent pcieport */
+ if (get_device_firmware_node_sun(slot_dev, ret) >= 0)
+ return 0;
+
+ return -ENOENT;
+}
+
static int dev_pci_slot(sd_device *dev, const LinkInfo *info, NetNames *names) {
const char *sysname, *attr;
unsigned domain, bus, slot, func;
@@ -517,13 +562,20 @@ 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));
- r = pci_get_hotplug_slot(names->pcidev, &hotplug_slot);
- if (r < 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;
+ if (naming_scheme_has(NAMING_FIRMWARE_NODE_SUN))
+ r = pci_get_slot_from_firmware_node_sun(names->pcidev, &hotplug_slot);
+ else
+ r = -1;
+ /* If we don't find a slot using firmware_node/sun, fallback to hotplug_slot */
+ if (r < 0) {
+ r = pci_get_hotplug_slot(names->pcidev, &hotplug_slot);
+ if (r < 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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