Michael Brown [Fri, 3 Dec 2010 04:44:10 +0000 (04:44 +0000)]
[libflat] Test A20 gate without switching to flat real mode
Use the real-mode address ffff:0010 to access the linear address
0x100000, and so test whether or not the A20 gate is enabled without
requiring a switch into flat real mode (or some other addressing
mode).
This speeds up CPU mode transitions, and also avoids breaking the NBP
from IBM's Tivoli Provisioning Manager for Operating System
Deployment. This NBP makes some calls to iPXE in VM86 mode rather
than true real mode and does not correctly emulate our transition into
flat real mode.
Interestingly, Tivoli's VMM *does* allow us to switch into protected
mode (though it patches our GDT so that we execute in ring 1 rather
than ring 0). However, paging is still disabled and we have a 4GB
segment limit. Being in ring 1 does not, therefore, restrict us in
any meaningful way; this has been verified by deliberately writing
garbage over Tivoli's own GDT (at address 0x02201010) during a
nominally VM86-mode PXE API call. It's unclear precisely what
protection this VMM is supposed to be offering.
Suggested-by: Joshua Oreman <oremanj@rwcr.net> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Wed, 1 Dec 2010 18:46:50 +0000 (18:46 +0000)]
[vlan] Expose vlan_find() to network card drivers
Some network cards automatically strip the VLAN header, providing the
VLAN tag via a side channel such as a completion queue entry. These
cards need to be able to report receive completions directly against
the relevant VLAN device.
Michael Brown [Wed, 1 Dec 2010 17:15:52 +0000 (17:15 +0000)]
[vlan] Use "-" instead of "." as separator in VLAN device names
VLAN device names have the form "netX.Y", e.g. "net0.5" for VLAN 5 on
net0. This use of "." conflicts with the use of "." as the
hierarchical separator in settings block names, with the result that
VLAN device settings cannot be accessed by name.
It would be trivial to treat the VLAN device settings as being a child
of the trunk device settings, but this would cause the VLAN device
settings to be applied to the trunk device: for example, setting
"net0.5/ip" would then apply the IP address to both net0.5 and net0.
Fix by changing the VLAN device name to use "-" instead of ".": the
VLAN device "net0.5" is now "net0-5".
Michael Brown [Wed, 1 Dec 2010 16:34:23 +0000 (16:34 +0000)]
[settings] Apply settings block name in register_settings()
Pass the settings block name as a parameter to register_settings(),
rather than defining it with settings_init() (and then possibly
changing it by directly manipulating settings->name).
Michael Brown [Mon, 29 Nov 2010 14:19:59 +0000 (14:19 +0000)]
[cmdline] Match user expectations for &&, ||, goto, and exit
The && and || operators should be left-associative, since that is how
they are treated in most other languages (including C and Unix
shell). For example, in the command:
dhcp net0 && goto dhcp_ok || echo No DHCP on net0
if the "dhcp net0" fails then the "echo" should be executed.
After an "exit" or a successful "goto", further commands on the same
line should never be executed. For example:
goto somewhere && echo This should never be printed
exit 0 && echo This should never be printed
exit 1 && echo This should never be printed
An "exit" should cause the current shell or script to terminate and
return the specified exit status to its caller. For example:
Michael Brown [Sun, 28 Nov 2010 17:26:27 +0000 (17:26 +0000)]
[build] Use __builtin_offsetof() when available
Some newer versions of gcc (observed with a patched gcc 4.5.1) seem to
treat our offsetof() implementation as not being a compile-time
constant. Fix by using __builtin_offsetof() when available. (As with
the original offsetof() macro, this code is copied from the Linux
kernel's stddef.h.)
Reported-by: Arkadiusz Miskiewicz <arekm@maven.pl> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sat, 27 Nov 2010 15:48:01 +0000 (15:48 +0000)]
[fcoe] Use only the first instance of a FIP descriptor
Almost all FIP packets contain at most one instance of each
descriptor. A VLAN notification may contain multiple VLAN
descriptors. The FCoE specification does not provide any guidance
regarding prioritisation of VLANs, so we may choose to arbitrarily
choose the first listed VLAN.
Michael Brown [Sat, 27 Nov 2010 15:23:46 +0000 (15:23 +0000)]
[vlan] Treat VLAN 0 as valid
VLAN headers are allowed to contain a VLAN tag of zero, indicating
that the header specifies only a priority and that the packet does not
belong to any VLAN. The easiest way to handle this is to treat VLAN 0
as being a normal VLAN.
Michael Brown [Sat, 27 Nov 2010 16:03:51 +0000 (16:03 +0000)]
[fcoe] Tidy up debug message
The increase in length in Fibre Channel device names causes the
"selected FCF" message to wrap beyond 80 characters. Fix by using
abbreviations where possible.
Michael Brown [Sat, 27 Nov 2010 14:21:08 +0000 (14:21 +0000)]
[fcoe] Create Fibre Channel port only when we have selected an FCF
Create the Fibre Channel port only when the FCoE port has selected a
Fibre Channel Forwarder to use. This avoids the confusion of having
an FC port created for the network device on which only VLAN discovery
is performed.
Expansion of the (admittedly perverse) "aaa}bbb${ccc" will currently
fail because expand_command() does not check that the closing "}"
occurs later than the opening "${".
Fix by ensuring that the most recent opening "${" is used to match
against the first *subsequent* closing "}".
Total cost of this change: -12 bytes, bringing the overall cost of
this feature to -4 bytes.
Michael Brown [Mon, 22 Nov 2010 21:31:00 +0000 (21:31 +0000)]
[cmdline] Fix multi-layer variable expansion
Expansion of ${${foo}} will currently fail, because the first
opening "${" will be incorrectly matched against the first closing
"}", leading to an attempt to expand the variable "${foo".
Fix by ensuring that the most recent opening "${" is used to match
against the first closing "}".
Michael Brown [Mon, 22 Nov 2010 21:11:03 +0000 (21:11 +0000)]
[settings] Allow "set" command to take an empty value
Allow "set <variable>" to be used to set the variable to an empty
value, if permitted by the setting type. Note that some settings
backends do not differentiate between an empty value and a
non-existent value, so this may or may not be equivalent to "clear
<variable>".
Michael Brown [Mon, 22 Nov 2010 04:19:24 +0000 (04:19 +0000)]
[script] Implement "goto" in iPXE scripts
Allow script labels to be defined using the syntax
:<labelname>
(nothing else allowed on the line, including whitespace). Labels are
ignored during script execution, but can be used as the target of the
"goto" command. For example:
#!ipxe
goto machine_${net0/ip} || goto machine_default
# Linux kernel boot
:machine_10.0.0.101
:machine_10.0.0.102
set filename http://my.boot.server/vmlinuz
goto done
# Default configuration
:machine_default
set filename pxelinux.0
goto done
Originally-implemented-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Originally-implemented-by: Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sun, 21 Nov 2010 15:58:30 +0000 (15:58 +0000)]
[parseopt] Add generic option-parsing library
Command implementations tend to include a substantial amount of common
boilerplate code revolving around the parsing of command-line options
and arguments. This increases the size cost of each command.
Introduce an option-parsing library that abstracts out the common
operations involved in command implementations. This enables the size
of each individual command to be reduced, and also enhances
consistency between commands.
Total size of the library is 704 bytes, to be amortised across all
command implementations.
Michael Brown [Sat, 20 Nov 2010 04:56:25 +0000 (04:56 +0000)]
[netdevice] Allow per-device receive queue processing to be frozen
Several use cases (e.g. the UNDI API and the EFI SNP API) require
access to the raw network device receive queue, and so currently use
manual calls to netdev_poll() on a specific network device in order to
prevent received packets from being processed by the network stack.
As an alternative, provide a flag that allows receive queue processing
to be frozen on a per-device basis. When receive queue processing is
frozen, packets will be enqueued as normal, but will not be
automatically dequeued and passed up the network stack.
Michael Brown [Fri, 19 Nov 2010 18:48:00 +0000 (18:48 +0000)]
[undi] Support underlying UNDI devices that don't support interrupts
Some network cards do not generate interrupts when operated via the
UNDI API. Allow for this by waiting for the ISR to be triggered only
if the PXE stack advertises that it supports interrupts. When the PXE
stack does not advertise interrupt support, we skip the call to
PXENV_UNDI_ISR_IN_START and just poll the device using
PXENV_UNDI_ISR_IN_PROCESS. This matches the observed behaviour of at
least one other PXE NBP (emBoot's winBoot/i), so there is a reasonable
chance of this working.
Originally-implemented-by: Muralidhar Appalla <Muralidhar.Appalla@emulex.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sat, 13 Nov 2010 00:22:23 +0000 (00:22 +0000)]
[settings] Add "hexhyp" setting type
Provide a "hexhyp" setting type, which functions identically to the
"hex" setting type except that it uses a hyphen instead of a colon as
the byte delimiter.
For example, if ${mac} expands to "52:54:00:12:34:56", then
${mac:hexhyp} will expand to "52-54-00-12-34-56".
Originally-implemented-by: Jarrod Johnson <jarrod.b.johnson@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Shao Miller [Tue, 9 Nov 2010 02:11:32 +0000 (02:11 +0000)]
[list] Fix typographical error from previous commit
Fix typographical error from commit ea631f6 ("[list] Add
list_first_entry()"). The symptom was PXELINUX 3.86 causing a stack
overflow under VMware.
Tested-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Fri, 5 Nov 2010 23:13:22 +0000 (23:13 +0000)]
[fc] Hold ULP's peer reference while ULP exists
Allow fc_ulp_decrement() to guarantee to fc_peer_decrement() that the
peer reference remains valid for the duration of the call, by ensuring
that ulp->peer remains valid while ulp is valid.
Michael Brown [Mon, 8 Nov 2010 03:06:14 +0000 (03:06 +0000)]
[retry] Process at most one timer's expiry in each call to retry_step()
Calling a timer's expiry method may cause arbitrary consequences,
including arbitrary modifications of the list of retry timers.
list_for_each_entry_safe() guards against only deletion of the current
list entry; it provides no protection against other list
modifications. In particular, if a timer's expiry method causes the
subsequent timer in the list to be deleted, then the next loop
iteration will access a timer that may no longer exist.
This is a particularly nasty bug, since absolutely none of the
list-manipulation or reference-counting assertion checks will be
triggered. (The first assertion failure happens on the next iteration
through list_for_each_entry(), showing that the list has become
corrupted but providing no clue as to when this happened.)
Fix by stopping traversal of the list of retry timers as soon as we
hit an expired timer.
Michael Brown [Fri, 5 Nov 2010 22:37:00 +0000 (22:37 +0000)]
[malloc] Avoid immediately clobbering reference count when freeing memory
Rearrange the fields in struct memory_block (without altering
MIN_MEMBLOCK_SIZE) so that the "count" field of a reference-counted
object is left intact when the memory containing the object is freed.
This allows for the possibility of detecting reference-counting errors
such as double-freeing.
Michael Brown [Sat, 6 Nov 2010 00:31:02 +0000 (00:31 +0000)]
[malloc] Use list_for_each_entry_safe() when we may delete a list entry
free_memblock() currently uses list_for_each_entry() to iterate over
the free list, and may delete an entry over which it iterates. While
there is no way that the deleted list entry could be overwritten
before we reference it, this does rely upon list_del() leaving the
"next" pointer intact, which is not guaranteed. Discovered while
tracking down a list-corruption bug (as a result of having modified
list_del() to sanitise the deleted list entry).
Michael Brown [Mon, 8 Nov 2010 02:51:18 +0000 (02:51 +0000)]
[list] Add list_first_entry()
There are several points in the iPXE codebase where
list_for_each_entry() is (ab)used to extract only the first entry from
a list. Add a macro list_first_entry() to make this code easier to
read.
Michael Brown [Wed, 3 Nov 2010 01:48:38 +0000 (01:48 +0000)]
[fcp] Fix potential memory leaks on error paths
Functions that instantiate objects generally own one reference to the
object being created. The error paths must therefore usually call
ref_put() to release this reference.
Dave Hansen [Thu, 21 Oct 2010 22:03:42 +0000 (15:03 -0700)]
[autoboot] Introduce "skip-san-boot" option
For some install-to-SAN scenarios, the OS needs to be able to reboot
to reread the partition table. On this second boot attempt, the SAN
disk will not be empty and so iPXE will attempt to boot from it,
rather than falling back to the OS' installation media.
Work around this problem by introducing the "skip-san-boot" option,
similar in spirit to "keep-san".
Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Sat, 16 Oct 2010 12:53:38 +0000 (13:53 +0100)]
[scsi] Wait for a successful TEST UNIT READY command
Some SCSI targets (observed with an EMC CLARiiON Fibre Channel target)
will not respond to commands correctly until a TEST UNIT READY has
been issued. In particular, a READ CAPACITY (10) command will return
with a success status, but no capacity data.
Fix by issuing a TEST UNIT READY command automatically, and delaying
further SCSI commands until the TEST UNIT READY has succeeded.
Reported-by: Hadar Hen Zion <hadarh@mellanox.co.il> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Tue, 19 Oct 2010 17:35:46 +0000 (18:35 +0100)]
[fc] Do not use the command reference number in FCP_CMND IUs
The FCP command reference number is intended to be used for
controlling precise delivery of FCP commands, rather than being an
essentially arbitrary tag field (as with iSCSI and SRP).
Use the Fibre Channel local exchange ID as the tag for FCP commands,
instead of the FCP command reference. The local exchange ID does not
appear within the FCP IU itself, but does appear within the FC frame
header; debug traces can therefore still be correlated with packet
captures.
Reported-by: Hadar Hen Zion <hadarh@mellanox.co.il> Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown [Tue, 19 Oct 2010 05:14:22 +0000 (06:14 +0100)]
[hci] Use http://ipxe.org/<errno> instead of raw error numbers
Users tend to gloss over cryptic-looking error messages such as
"Boot failed: Exec format error (Error 0x2e852001)"
In particular, users tend not to report the error number, which is the
single most useful piece of diagnostic information in an iPXE error
message. Try replacing the "Error 0x2e852001" portion with a URL,
giving
"Boot failed: Exec format error (http://ipxe.org/2e852001)"
in the hope that users will, upon seeing something that is
recognisably a URL, try viewing it in a web browser. Such users will
be greeted by a web page containing a more detailed description of the
error (automatically generated from the einfo text), including links
to each line of code that might generate the error, and a section for
additional user-contributed notes. At the time of writing, a user who
visits http://ipxe.org/2e852001 would see a note saying
"This error usually indicates that the SAN disk is empty, and does
not yet contain a bootable operating system."
which may be more useful than "Exec format error (Error 0x2e852001)".
projects / thirdparty / ipxe.git / log
