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Polling for TX completions is arguably redundant when there are no
transmissions currently in progress. Commit c6c7e78 ("[efi] Poll for
TX completions only when there is an outstanding TX buffer") switched
to setting the PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS flag only when
there is an in-progress transmission awaiting completion, in order to
reduce reported TX errors and debug message noise from buggy NII
implementations that report spurious TX completions whenever the
transmit queue is empty.
Some other NII implementations (observed with the Realtek driver in a
Dell Latitude 3440) seem to have a bug in the transmit datapath
handling which results in the transmit ring freezing after sending a
few hundred packets under heavy load. The symptoms are that the
TPPoll register's NPQ bit remains set and the 256-entry transmit ring
contains a large number of uncompleted descriptors (with the OWN bit
set), the first two of which have identical data buffer addresses.
Though iPXE will submit at most one in-progress transmission via NII,
the Dell/Realtek driver seems to make a page-aligned copy of each
transmit data buffer and to report TX completions immediately without
waiting for the packet to actually be transmitted. These synthetic TX
completions continue even after the hardware transmit ring freezes.
Setting PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS on every poll reduces the
probability of this Dell/Realtek driver bug being triggered by a
factor of around 500, which brings the failure rate down to the point
that it can sensibly be managed by external logic such as the
"--timeout" option for image downloads. Closing and reopening the
interface (via "ifclose"/"ifopen") will clear the error condition and
allow transmissions to resume.
Revert to setting PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS on every poll,
and silently ignore situations in which the hardware reports a
completion when no transmission is in progress. This approximately
matches the behaviour of the SnpDxe driver, which will also generally
set PXE_OPFLAGS_GET_TRANSMITTED_BUFFERS on every poll.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The Intel I210's packet buffer size registers reset only on power up,
not when a reset signal is asserted. This can lead to the inability
to pass traffic in the event that the DMA TX Maximum Packet Size
(which does reset to its default value on reset) is bigger than the TX
Packet Buffer Size.
For example, an operating system may be using the time sensitive
networking features of the I210 and the registers may be programmed
correctly, but then a reset signal is asserted and iPXE on the next
boot will be unable to use the I210.
Mimic what Linux does and forcibly set the registers to their default
values.
Signed-off-by: Matt Parrella <parrella.matthew@gmail.com>
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Signed-off-by: Forest Crossman <cyrozap@gmail.com>
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Some cards seem to have the receive VLAN tag stripping feature enabled
by default, which causes received VLAN packets to be misinterpreted as
being received by the trunk device.
Fix by disabling VLAN tag stripping in the C+ Command Register.
Debugged-by: Xinming Lai <yiyihu@gmail.com>
Tested-by: Xinming Lai <yiyihu@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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UEFI has the mildly annoying habit of installing copies of the
EFI_SIMPLE_NETWORK_PROTOCOL instance on the IPv4 and IPv6 child device
handles. This can cause iPXE's SNP driver to attempt to bind to a
copy of the EFI_SIMPLE_NETWORK_PROTOCOL that iPXE itself provided on a
different handle.
Fix by refusing to bind to an SNP (or NII) handle if there exists
another instance of the same protocol further up the device path (on
the basis that we always want to bind to the highest possible device).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Extend the functionality of efi_locate_device() to allow callers to
find instances of the protocol that may exist further up the device
path.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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We currently don't allocate an Asynchronous Event Notification Queue
(AENQ) because we don't actually care about any of the events that may
come in.
The ENA firmware found on Graviton instances requires the AENQ to
exist, otherwise all admin queue commands will fail.
Fix by allocating an AENQ and disabling all events (so that we do not
need to include code to acknowledge any events that may arrive).
Signed-off-by: Alexander Graf <graf@amazon.com>
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Many laptops now include the ability to specify a "system-specific MAC
address" (also known as "pass-through MAC"), which is supposed to be
used for both the onboard NIC and for any attached docking station or
other USB NIC. This is intended to simplify interoperability with
software or hardware that relies on a MAC address to recognise an
individual machine: for example, a deployment server may associate the
MAC address with a particular operating system image to be deployed.
This therefore creates legitimate situations in which duplicate MAC
addresses may exist within the same system.
As described in commit 98d09a1 ("[netdevice] Avoid registering
duplicate network devices"), the Xen netfront driver relies on the
rejection of duplicate MAC addresses in order to inhibit registration
of the emulated PCI devices that a Xen PV-HVM guest will create to
shadow each of the paravirtual network devices.
Move the code that rejects duplicate MAC addresses from the network
device core to the Xen netfront driver, to allow for the existence of
duplicate MAC addresses in non-Xen setups.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some UNDI drivers (such as the AMI UsbNetworkPkg currently in the
process of being upstreamed into EDK2) have a bug that will prevent
any packets from being received unless at least one attempt has been
made to disable some receive filters.
Work around these buggy drivers by attempting to disable receive
filters before enabling them. Ignore any errors, since we genuinely
do not care whether or not the disabling succeeds.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Christian I. Nilsson <nikize@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some BIOSes in AWS EC2 (observed with a c6i.metal instance in
eu-west-2) will fail to assign an MMIO address to the ENA device,
which causes ioremap() to fail.
Experiments show that the ENA device is the only device behind its
bridge, even when multiple ENA devices are present, and that the BIOS
does assign a memory window to the bridge.
We may therefore choose to assign the device an MMIO address at the
start of the bridge's memory window.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some versions of the ENA hardware (observed on a c6i.large instance in
eu-west-2) seem to require a receive ring containing at least 128
entries: any smaller ring will never see receive completions or will
stall after the first few completions.
Increase the receive ring size to 128 entries (determined empirically)
for compatibility with these hardware versions. Limit the receive
ring fill level to 16 (as at present) to avoid consuming more memory
than will typically be available in the internal heap.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some versions of the ENA firmware (observed on a c6i.large instance in
eu-west-2) seem to require a host information page, without which the
CREATE_CQ command will fail with ENA_ADMIN_UNKNOWN_ERROR.
These firmware versions also seem to require us to claim that we are a
Linux kernel with a specific driver major version number. This
appears to be a firmware bug, as revealed by Linux kernel commit
1a63443af ("net/amazon: Ensure that driver version is aligned to the
linux kernel"): this commit changed the value of the driver version
number field to be the Linux kernel version, and was hastily reverted
in commit 92040c6da ("net: ena: fix broken interface between ENA
driver and FW") which clarified that the version number field does
actually have some undocumented significance to some versions of the
firmware.
Fix by providing a host information page via the SET_FEATURE command,
incorporating the apparently necessary lies about our identity.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some versions of the ENA firmware (observed on a c6i.large instance in
eu-west-2) will complain if the completion queue's MSI-X vector field
is left empty, even though the queue configuration specifies that
interrupts are not used.
Work around these firmware versions by passing in what appears to be
the magic "no MSI-X vector" value in this field.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The ENA data path design has separate submission and completion
queues. Submission queues must be refilled in strict order (since
there is only a single linear tail pointer used to communicate the
existence of new entries to the hardware), and completion queue
entries include a request identifier copied verbatim from the
submission queue entry. Once the submission queue doorbell has been
rung, software never again reads from the submission queue entry and
nothing ever needs to write back to the submission queue entry since
completions are reported via the separate completion queue.
This design allows the hardware to complete submission queue entries
out of order, provided that it internally caches at least as many
entries as it leaves gaps.
Record and identify I/O buffers by request identifier (using a
circular ring buffer of unique request identifiers), and remove the
assumption that submission queue entries will be completed in order.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The CREATE_CQ command is permitted to return a size smaller than
requested, which could leave us in a situation where the completion
queue could overflow.
Avoid overflow by limiting the submission queue fill level to the
actual size of the completion queue.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Current versions of the E810 PF driver fail to set the number of
in-use queue pairs in response to the CONFIG_VSI_QUEUES message. When
the number of in-use queue pairs is less than the number of available
queue pairs, this results in some packets being directed to
nonexistent receive queues and hence silently dropped.
Work around this PF driver bug by explicitly configuring the number of
available queue pairs via the REQUEST_QUEUES message. This message
triggers a VF reset that, in turn, requires us to reopen the admin
queue and issue an additional GET_RESOURCES message to restore the VF
to a functional state.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The RESET_VF admin queue command does not complete via the usual
mechanism, but instead requires us to poll registers to wait for the
reset to take effect and then reopen the admin queue.
Allow for the existence of other admin queue commands that also
trigger a VF reset, by separating out the logic that waits for the
reset to complete.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Negotiate API version 1.1 in order to allow access to virtual function
opcodes that are disallowed by default on the E810.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Add a driver for the E810 family of 100 Gigabit Ethernet NICs. The
core datapath is identical to that of the 40 Gigabit XL710, and this
part of the code is shared between both drivers. The admin queue
mechanism is sufficiently similar to make it worth reusing substantial
portions of the code, with separate implementations for several
commands to handle the (unnecessarily) breaking changes in data
structure layouts. The major differences are in the mechanisms for
programming queue contexts (where the E810 abandons TX/RX symmetry)
and for configuring the transmit scheduler and receive filters: these
portions are sufficiently different to justify a separate driver.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove knowledge of the PRTGL_SA[HL] registers, and instead use the
admin queue to set the MAC address and maximum frame size.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove knowledge of the PRTPM_SA[HL] registers, and instead use the
admin queue to retrieve the MAC address.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Allow for the MAC address to be fetched using an admin queue command,
instead of reading the PRTPM_SA[HL] registers directly.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The PRTGL_SAH register contains the current maximum frame size, and is
not guaranteed on reset to contain the actual maximum frame size
supported by the hardware, which the datasheet specifies as 9728 bytes
(including the 4-byte CRC).
Set the maximum packet size to a hardcoded 9728 bytes instead of
reading from the PRTGL_SAH register.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove knowledge of the GLLAN_RCTL_0 register (which changes location
between the XL810 and E810 register maps), and instead unconditionally
issue the "clear PXE mode" command with the EEXIST error silenced.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The "clear PXE mode" admin queue command will return an EEXIST error
if the device is already in non-PXE mode, but there is no other admin
queue command that can be used to determine whether the device has
already been switched into non-PXE mode.
Provide a mechanism to allow expected errors from a command to be
silenced, to allow the "clear PXE mode" command to be cleanly used
without needing to first check the GLLAN_RCTL_0 register value.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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At least one E810 admin queue command (Query Default Scheduling Tree
Topology) insists upon being provided with a 4kB data buffer, even
when the data to be returned is much smaller.
Work around this requirement by increasing the admin queue data buffer
size to 4kB.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Move knowledge of the virtual function data structures and admin
command definitions from intelxl.h to intelxlvf.h.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove the large static admin data buffer structure embedded within
struct intelxl_nic, and instead copy the response received via the
"send to VF" admin queue event to the (already consumed and completed)
admin command descriptor and data buffer.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The physical and virtual function drivers each care about precisely
one admin queue event type. Simplify event handling by using a
per-driver callback instead of the existing weak function symbol.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The PCI device ID 8086:1889 is for the Intel Ethernet Adaptive Virtual
Function, which is a generic virtual function that can be exposed by
different generations of Intel hardware.
Rename the PCI ID from "xl710-vf-ad" to "iavf" to reflect that the
driver is not XL710-specific.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The E810 requires that receive descriptor rings have at least 64
entries (and are a multiple of 32 entries).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Do not attempt to use the admin commands to get the firmware version
and report the driver version for the virtual function driver, since
these will be rejected by the E810 firmware as invalid commands when
issued by a virtual function. Instead, use the mailbox interface to
negotiate the API version with the physical function driver.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The 100 Gigabit physical function driver requires a virtual function
driver to request that transmit and receive queues are mapped to MSI-X
vector 1 or higher.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The second parameter to intelxlvf_admin_queues() is a boolean used to
select the VF opcode, rather than the raw VF opcode itself.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove knowledge of the PFGEN_CTRL register (which changes location
between XL710 and E810 register maps), and instead use PCIe FLR to
reset the physical function.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Use the tail register offset (which exists for all ring types) as the
ring identifier in all relevant debug messages.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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For the sake of completeness, ensure that all 32 bytes of the receive
queue context are programmed (including the unused final 8 bytes).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Commit 8f3e648 ("[intelxl] Use one admin queue buffer per admin queue
descriptor") changed the API for intelxl_admin_command() such that the
caller now constructs the command directly within the next available
descriptor ring entry, rather than relying on intelxl_admin_command()
to copy the descriptor to and from the descriptor ring.
This introduced a regression in intelxl_admin_switch(), since the
second and subsequent iterations of the loop will not have constructed
a valid command in the new descriptor ring entry before calling
intelxl_admin_command().
Fix by constructing the command within the loop.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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When applying an ACPI-provided system-specific MAC address, apply it
to netdev->ll_addr rather than netdev->hw_addr. This allows iPXE
scripts to access the permanent MAC address via the ${netX/hwaddr}
setting (and thereby provides scripts with a mechanism to ascertain
that the NIC is using a MAC address other than its own permanent
hardware address).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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On some systems (observed with the Thunderbolt ports on a ThinkPad X1
Extreme Gen3 and a ThinkPad P53), if the IOMMU is enabled then the
system firmware will install an ExitBootServices notification event
that disables bus mastering on the Thunderbolt xHCI controller and all
PCI bridges, and destroys any extant IOMMU mappings. This leaves the
xHCI controller unable to perform any DMA operations.
As described in commit 236299b ("[xhci] Avoid DMA during shutdown if
firmware has disabled bus mastering"), any subsequent DMA operation
attempted by the xHCI controller will end up completing after the
operating system kernel has reenabled bus mastering, resulting in a
DMA operation to an area of memory that the hardware is no longer
permitted to access and, on Windows with the Driver Verifier enabled,
a STOP 0xE6 (DRIVER_VERIFIER_DMA_VIOLATION).
That commit avoids triggering any DMA attempts during the shutdown of
the xHCI controller itself. However, this is not a complete solution
since any attached and opened USB device (e.g. a USB NIC) may
asynchronously trigger DMA attempts that happen to occur after bus
mastering has been disabled but before we reset the xHCI controller.
Avoid this problem by installing our own ExitBootServices notification
event at TPL_NOTIFY, thereby causing it to be invoked before the
firmware's own ExitBootServices notification event that disables bus
mastering.
This unsurprisingly causes the shutdown hook itself to be invoked at
TPL_NOTIFY, which causes a fatal error when later code attempts to
raise the TPL to TPL_CALLBACK (which is a lower TPL). Work around
this problem by redefining the "internal" iPXE TPL to be variable, and
set this internal TPL to TPL_NOTIFY when the shutdown hook is invoked.
Avoid calling into an underlying SNP protocol instance from within our
shutdown hook at TPL_NOTIFY, since the underlying SNP driver may
attempt to raise the TPL to TPL_CALLBACK (which would cause a fatal
error). Failing to shut down the underlying SNP device is safe to do
since the underlying device must, in any case, have installed its own
ExitBootServices hook if any shutdown actions are required.
Reported-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Aaron Young <aaron.young@oracle.com>
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Use the "system MAC address" provided within the DSDT/SSDT if such an
address is available and has not already been assigned to a network
device.
Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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