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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Include a potential DMA mapping within the definition of an I/O
buffer, and move all I/O buffer DMA mapping functions from dma.h to
iobuf.h. This avoids the need for drivers to maintain a separate list
of DMA mappings for each I/O buffer that they may handle.
Network device drivers typically do not keep track of transmit I/O
buffers, since the network device core already maintains a transmit
queue. Drivers will typically call netdev_tx_complete_next() to
complete a transmission without first obtaining the relevant I/O
buffer pointer (and will rely on the network device core automatically
cancelling any pending transmissions when the device is closed).
To allow this driver design approach to be retained, update the
netdev_tx_complete() family of functions to automatically perform the
DMA unmapping operation if required. For symmetry, also update the
netdev_rx() family of functions to behave the same way.
As a further convenience for drivers, allow the network device core to
automatically perform DMA mapping on the transmit datapath before
calling the driver's transmit() method. This avoids the need to
introduce a mapping error handling code path into the typically
error-free transmit methods.
With these changes, the modifications required to update a typical
network device driver to use the new DMA API are fairly minimal:
- Allocate and free descriptor rings and similar coherent structures
using dma_alloc()/dma_free() rather than malloc_phys()/free_phys()
- Allocate and free receive buffers using alloc_rx_iob()/free_rx_iob()
rather than alloc_iob()/free_iob()
- Calculate DMA addresses using dma() or iob_dma() rather than
virt_to_bus()
- Set a 64-bit DMA mask if needed using dma_set_mask_64bit() and
thereafter eliminate checks on DMA address ranges
- Either record the DMA device in netdev->dma, or call iob_map_tx() as
part of the transmit() method
- Ensure that debug messages use virt_to_phys() when displaying
"hardware" addresses
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The eIPoIB translation layer needs to translate outbound ARP packets
from Ethernet to IPoIB. A 64-byte buffer (starting with the Ethernet
header) does not provide enough tailroom to expand to hold the two
20-byte IPoIB MAC addresses. The result is that an UNDI API user will
be unable to send ARP packets.
We could potentially shuffle the packet contents to reuse the space
occupied by the stripped Ethernet link-layer header, but this would
add complexity. Instead, fix by increasing the minimum allocation
size to 128 bytes.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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These files cannot be automatically relicensed by util/relicense.pl
since they either contain unusual but trivial contributions (such as
the addition of __nonnull function attributes), or contain lines
dating back to the initial git revision (and so require manual
knowledge of the code's origin).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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RNDIS devices may provide multiple packets encapsulated into a single
message. Provide an API to allow the RNDIS driver to split an I/O
buffer into smaller portions.
The current implementation will always copy the underlying data,
rather than splitting the buffer in situ.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Allow non-data records to be split across multiple received I/O
buffers, to accommodate large certificate chains.
Reported-by: Nicola Volpini <Nicola.Volpini@kambi.com>
Tested-by: Nicola Volpini <Nicola.Volpini@kambi.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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iPXE currently aligns all I/O buffers on a 2kB boundary. This is
overkill for transmitted packets, which are typically much smaller
than 2kB.
Align I/O buffers on their own size. This reduces the alignment
requirement for small buffers, while preserving the guarantee that I/O
buffers will never cross boundaries that might cause problems for some
DMA engines.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Access to the gpxe.org and etherboot.org domains and associated
resources has been revoked by the registrant of the domain. Work
around this problem by renaming project from gPXE to iPXE, and
updating URLs to match.
Also update README, LOG and COPYRIGHTS to remove obsolete information.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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