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From 2a73ec2f11e5dde5754260d0ce99778f35ec92cc Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Wed, 17 Jan 2018 10:08:08 +0100
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Subject: [PATCH] udev: net_id add support for platform bus (ACPI, mostly
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 arm64) devices
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(cherry picked from commit c20e6de897b2378bc3f936e1e265d2d2e2450a73)
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Note: There is RHEL-only code in the patch. After some discussion,
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we only want to rename Hisilicon Network Subsystem (HNS) devices.
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Resolves: #1529633
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---
23b3cf
 src/udev/udev-builtin-net_id.c | 72 ++++++++++++++++++++++++++++++++++
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 1 file changed, 72 insertions(+)
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diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
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index 19e1f2631..69cee5a72 100644
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--- a/src/udev/udev-builtin-net_id.c
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+++ b/src/udev/udev-builtin-net_id.c
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@@ -42,6 +42,7 @@
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  *                                         -- PCI geographical location
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  *   [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
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  *                                         -- USB port number chain
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+ *   a<vendor><model>i<instance>           -- Platform bus ACPI instance id
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  *
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  * All multi-function PCI devices will carry the [f<function>] number in the
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  * device name, including the function 0 device.
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@@ -100,6 +101,7 @@
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 #include "udev.h"
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 #include "fileio.h"
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+#include "def.h"
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 #define ONBOARD_INDEX_MAX (16*1024-1)
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@@ -110,6 +112,7 @@ enum netname_type{
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         NET_BCMA,
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         NET_VIRTIO,
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         NET_CCWGROUP,
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+        NET_PLATFORM,
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 };
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 struct netnames {
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@@ -127,6 +130,7 @@ struct netnames {
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         char usb_ports[IFNAMSIZ];
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         char bcma_core[IFNAMSIZ];
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         char ccw_group[IFNAMSIZ];
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+        char platform_path[IFNAMSIZ];
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 };
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 /* retrieve on-board index number and label from firmware */
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@@ -288,6 +292,64 @@ out:
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         return err;
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 }
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+#define _PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
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+#define _PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
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+#define _PLATFORM_PATTERN3 "/sys/devices/platform/%3s%4x:%2x/net/eth%u"
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+
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+static int names_platform(struct udev_device *dev, struct netnames *names, bool test) {
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+        struct udev_device *parent;
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+        char vendor[5];
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+        unsigned model, instance, ethid;
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+        const char *syspath, *pattern, *validchars;
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+
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+        /* check if our direct parent is a platform device with no other bus in-between */
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+        parent = udev_device_get_parent(dev);
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+        if (!parent)
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+                return -ENOENT;
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+
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+        if (!streq_ptr("platform", udev_device_get_subsystem(parent)))
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+                 return -ENOENT;
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+
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+        syspath = udev_device_get_syspath(dev);
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+
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+        /* syspath is too short, to have a valid ACPI instance */
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+        if (strlen(syspath) < sizeof _PLATFORM_TEST)
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+                return -EINVAL;
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+
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+        /* Vendor ID can be either PNP ID (3 chars A-Z) or ACPI ID (4 chars A-Z and numerals) */
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+        if (syspath[sizeof _PLATFORM_TEST - 1] == ':') {
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+                pattern = _PLATFORM_PATTERN4;
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+                validchars = UPPERCASE_LETTERS DIGITS;
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+        } else {
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+                pattern = _PLATFORM_PATTERN3;
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+                validchars = UPPERCASE_LETTERS;
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+        }
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+
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+        /* RHEL-only! */
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+        /* We only want to rename HNS cards */
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+        if (!startswith(syspath, "/sys/devices/platform/HISI"))
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+                return -ENOENT;
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+
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+        /* Platform devices are named after ACPI table match, and instance id
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+         * eg. "/sys/devices/platform/HISI00C2:00");
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+         * The Vendor (3 or 4 char), followed by hexdecimal model number : instance id.
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+         */
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+#pragma GCC diagnostic push
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+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
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+        if (sscanf(syspath, pattern, vendor, &model, &instance, &ethid) != 4)
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+                return -EINVAL;
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+#pragma GCC diagnostic pop
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+
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+        if (!in_charset(vendor, validchars))
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+                return -ENOENT;
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+
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+        ascii_strlower(vendor);
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+
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+        xsprintf(names->platform_path, "a%s%xi%u", vendor, model, instance);
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+        names->type = NET_PLATFORM;
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+        return 0;
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+}
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+
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 static int names_pci(struct udev_device *dev, struct netnames *names) {
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         struct udev_device *parent;
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         static int do_virtio = -1;
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@@ -555,6 +617,16 @@ static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool
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                 goto out;
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         }
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+        /* get ACPI path names for ARM64 platform devices */
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+        err = names_platform(dev, &names, test);
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+        if (err >= 0 && names.type == NET_PLATFORM) {
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+                char str[IFNAMSIZ];
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+
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+                if (snprintf(str, sizeof(str), "%s%s", prefix, names.platform_path) < (int)sizeof(str))
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+                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
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+                goto out;
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+        }
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+
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         /* get PCI based path names, we compose only PCI based paths */
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         err = names_pci(dev, &names);
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         if (err < 0)