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bbff2f321a
Currently, AF_XDP only supports a fixed frame-size memory scheme where each frame is referenced via an index (idx). A user passes the frame index to the kernel, and the kernel acts upon the data. Some NICs, however, do not have a fixed frame-size model, instead they have a model where a memory window is passed to the hardware and multiple frames are filled into that window (referred to as the "type-writer" model). By changing the descriptor format from the current frame index addressing scheme, AF_XDP can in the future be extended to support these kinds of NICs. In the index-based model, an idx refers to a frame of size frame_size. Addressing a frame in the UMEM is done by offseting the UMEM starting address by a global offset, idx * frame_size + offset. Communicating via the fill- and completion-rings are done by means of idx. In this commit, the idx is removed in favor of an address (addr), which is a relative address ranging over the UMEM. To convert an idx-based address to the new addr is simply: addr = idx * frame_size + offset. We also stop referring to the UMEM "frame" as a frame. Instead it is simply called a chunk. To transfer ownership of a chunk to the kernel, the addr of the chunk is passed in the fill-ring. Note, that the kernel will mask addr to make it chunk aligned, so there is no need for userspace to do that. E.g., for a chunk size of 2k, passing an addr of 2048, 2050 or 3000 to the fill-ring will refer to the same chunk. On the completion-ring, the addr will match that of the Tx descriptor, passed to the kernel. Changing the descriptor format to use chunks/addr will allow for future changes to move to a type-writer based model, where multiple frames can reside in one chunk. In this model passing one single chunk into the fill-ring, would potentially result in multiple Rx descriptors. This commit changes the uapi of AF_XDP sockets, and updates the documentation. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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| ABI | ||
| accelerators | ||
| accounting | ||
| acpi | ||
| admin-guide | ||
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| doc-guide | ||
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| atomic_bitops.txt | ||
| atomic_t.txt | ||
| bcache.txt | ||
| bt8xxgpio.txt | ||
| btmrvl.txt | ||
| bus-virt-phys-mapping.txt | ||
| cachetlb.txt | ||
| cgroup-v2.txt | ||
| Changes | ||
| circular-buffers.txt | ||
| clearing-warn-once.txt | ||
| clk.txt | ||
| CodingStyle | ||
| conf.py | ||
| cpu-load.txt | ||
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| dcdbas.txt | ||
| debugging-modules.txt | ||
| debugging-via-ohci1394.txt | ||
| dell_rbu.txt | ||
| digsig.txt | ||
| DMA-API-HOWTO.txt | ||
| DMA-API.txt | ||
| DMA-attributes.txt | ||
| DMA-ISA-LPC.txt | ||
| docutils.conf | ||
| dontdiff | ||
| efi-stub.txt | ||
| eisa.txt | ||
| flexible-arrays.txt | ||
| futex-requeue-pi.txt | ||
| gcc-plugins.txt | ||
| highuid.txt | ||
| hw_random.txt | ||
| hwspinlock.txt | ||
| index.rst | ||
| intel_txt.txt | ||
| Intel-IOMMU.txt | ||
| io_ordering.txt | ||
| io-mapping.txt | ||
| iostats.txt | ||
| IPMI.txt | ||
| IRQ-affinity.txt | ||
| IRQ-domain.txt | ||
| IRQ.txt | ||
| irqflags-tracing.txt | ||
| isa.txt | ||
| isapnp.txt | ||
| kernel-per-CPU-kthreads.txt | ||
| kobject.txt | ||
| kprobes.txt | ||
| kref.txt | ||
| ldm.txt | ||
| lockup-watchdogs.txt | ||
| logo.gif | ||
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| lsm.txt | ||
| lzo.txt | ||
| mailbox.txt | ||
| Makefile | ||
| memory-barriers.txt | ||
| memory-hotplug.txt | ||
| men-chameleon-bus.txt | ||
| nommu-mmap.txt | ||
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| numastat.txt | ||
| padata.txt | ||
| parport-lowlevel.txt | ||
| percpu-rw-semaphore.txt | ||
| phy.txt | ||
| pi-futex.txt | ||
| pnp.txt | ||
| preempt-locking.txt | ||
| pwm.txt | ||
| rbtree.txt | ||
| remoteproc.txt | ||
| rfkill.txt | ||
| robust-futex-ABI.txt | ||
| robust-futexes.txt | ||
| rpmsg.txt | ||
| rtc.txt | ||
| SAK.txt | ||
| sgi-ioc4.txt | ||
| siphash.txt | ||
| SM501.txt | ||
| smsc_ece1099.txt | ||
| speculation.txt | ||
| static-keys.txt | ||
| SubmittingPatches | ||
| svga.txt | ||
| switchtec.txt | ||
| sync_file.txt | ||
| tee.txt | ||
| this_cpu_ops.txt | ||
| unaligned-memory-access.txt | ||
| vfio-mediated-device.txt | ||
| vfio.txt | ||
| video-output.txt | ||
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