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Virtio buses are undeterministically enumerated, so we cannot use them as a basis
for deterministic naming (see bf81e792f3c0). However, we are guaranteed that there
is only ever one virtio bus for every parent device, so we can simply skip over
the virtio buses when naming the devices.
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Mostly for documentation purposes.
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The original code used fread(), which on some libc implementions
(ie glibc 2.17) would pre-read a full 4K (PAGE_SIZE) of the
PCI config space, when only 64 bytes were requested.
I have recently come across PCIe hardware which responds with
Completion Timeouts when accesses above 256 bytes are attempted.
This can cause server systems with GHES/AEPI support to cause
and immediate kernel panic due to the failed PCI transaction.
This change replaces the buffered fread() with an explict
unbuffered read() of 64 bytes, which corrects this issue by
only reading the guaranteed first 64 bytes of PCIe config space.
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The dev_port concept is a bit confusing, expand on the comment a bit.
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I'd argue that having firmware labels for such devices makes
no sense, but they exist, so make sure we handle them as best
as we can.
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In case pci_slot overflows we were truncating pci_path instead.
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After all it is now much more like strjoin() than strappend(). At the
same time, add support for NULL sentinels, even if they are normally not
necessary.
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Types used for pids and uids in various interfaces are unpredictable.
Too bad.
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various other tools
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For network devices on the same PCI function, dev_id should not be used,
since its purpose is for IPv6 support on interfaces with the same MAC
address.
The new dev_port sysfs attribute should be used instead of dev_id.
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This reverts commit 8741f2defaf26aafe5ee0fd29954cfdf84ee519c: 'Add virtio-blk support to path_id' and
commit e3d563346c4237af23335cc6904e0662efdf62ad: 'udev: net_id - handle virtio buses'.
Distros may want to take note of this, as it changes behavior.
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Use the bus-ID to create predicatable devices names for network interfaces
on Linux on System z instances. The bus-ID identifies a device in the s390
channel subsystem.
Network interfaces of device type Ethernet are named as:
enccw0.0.1234 (13 characters)
up to
enccwff.7.ffff (14 characters)
CTC network devices of device type SLIP, use a different prefix as follows:
slccw0.0.1234 (13 characters)
See also Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=870859
[tomegun: typical problem of netdevs switching names between reboots.]
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This was already supported in path_id, so should be uncontroversial.
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Since numbers involved are all small, behaviour was correct already.
https://bugzilla.redhat.com/show_bug.cgi?id=1043304
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- Add space between if/for and the opening parentheses
- Place the opening brace on same line as the function (not for udev)
From the CODING_STYLE
Try to use this:
void foo() {
}
instead of this:
void foo()
{
}
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Onboard network controllers are not always on PCI domain 0.
[Kay: use int instead of long, add [P] to slot naming, remove sysname var]
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Before, we would initialize many fields twice: first
by filling the structure with zeros, and then a second
time with the real values. We can let the compiler do
the job for us, avoiding one copy.
A downside of this patch is that text gets slightly
bigger. This is because all zero() calls are effectively
inlined:
$ size build/.libs/systemd
text data bss dec hex filename
before 897737 107300 2560 1007597 f5fed build/.libs/systemd
after 897873 107300 2560 1007733 f6075 build/.libs/systemd
… actually less than 1‰.
A few asserts that the parameter is not null had to be removed. I
don't think this changes much, because first, it is quite unlikely
for the assert to fail, and second, an immediate SEGV is almost as
good as an assert.
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The android gadget driver for network tethering over rndis somehow has a
parent device with a null subsystem. Probably this is bug in android driver,
but it is easy enough to make systemd/udev behave gracefully and not
segfault. And this will help for making linux distros with systemd
(like fedora) work on android devices.
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Also split out some fileio functions to fileio.c and provide a SELinux
aware pendant in fileio-label.c
see https://bugzilla.redhat.com/show_bug.cgi?id=881577
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The individual address block is a poor man's organizationally unique
identifier.
Perhaps we should change the udev key from ID_OUI_FROM_DATABASE to
something like ID_IEEE_VENDOR_FROM_DATABASE?
Suggested-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
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