XDP: Difference between revisions

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In the beginning, there were applications slinging streams through the packetizing [https://en.wikipedia.org/wiki/Interface_Message_Processor Honeywell DDP-516] IMPs, and it was good. Then multiple applications needed the network, and needed it in different ways. Then the networks needed walls of fire, and traffic which was shaped. Some called for the [https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching Labeling of Multiple Protocols], and others called for timestamps, and still others wanted to SNAT and DNAT and also to masquerade. And yea, IP was fwadm'd, and then chained, and then tabled, and soon arps and bridges too were tabled. And behold now tables of "nf" and "x". And [[Van Jacobson Channels|Van Jacobson]] looked [[TCP|once more]] upon the land, and frowned, and shed a single tear which became a Channel. And then every ten years or so, we celebrate this by rediscovering Van Jacobson channels under a new name, these days complete with logos and corporate sponsorship.

Most recently, they were rediscovered under the name [[DPDK]], but the masters of the Linux kernel eschewed it, and instead rediscovered them under the name XDP, the eXpress Data Path, and eXpressed it using [[eBPF]] programs. XDP was added to Linux 4.8 and has been heavily developed since then, and is often seen together with [[Io_uring|iouring]], especially with the new <tt>AF_XDP</tt> family of sockets.

Most recently, they were rediscovered under the name [[DPDK]], but the masters of the Linux kernel eschewed this, and instead rediscovered them under the name XDP, the eXpress Data Path, and eXpressed it using [[eBPF]] programs. XDP was added to Linux 4.8 and has been heavily developed since then, and is often seen together with [[Io_uring|iouring]], especially with the new <tt>AF_XDP</tt> family of sockets.

XDP is used to bypass large chunks of the Linux networking stack (including all allocations, particularly <tt>alloc_skb()</tt>), especially when dropping packets or shuffling them between NICs.

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 In the beginning, there were applications slinging streams through the packetizing [https://en.wikipedia.org/wiki/Interface_Message_Processor Honeywell DDP-516] IMPs, and it was good. Then multiple applications needed the network, and needed it in different ways. Then the networks needed walls of fire, and traffic which was shaped. Some called for the [https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching Labeling of Multiple Protocols], and others called for timestamps, and still others wanted to SNAT and DNAT and also to masquerade. And yea, IP was fwadm'd, and then chained, and then tabled, and soon arps and bridges too were tabled. And behold now tables of "nf" and "x". And [[Van Jacobson Channels|Van Jacobson]] looked [[TCP|once more]] upon the land, and frowned, and shed a single tear which became a Channel. And then every ten years or so, we celebrate this by rediscovering Van Jacobson channels under a new name, these days complete with logos and corporate sponsorship.
-Most recently, they were rediscovered under the name [[DPDK]], but the masters of the Linux kernel eschewed it, and instead rediscovered them under the name XDP, the eXpress Data Path, and eXpressed it using [[eBPF]] programs. XDP was added to Linux 4.8 and has been heavily developed since then, and is often seen together with [[Io_uring|iouring]], especially with the new <tt>AF_XDP</tt> family of sockets.
+Most recently, they were rediscovered under the name [[DPDK]], but the masters of the Linux kernel eschewed this, and instead rediscovered them under the name XDP, the eXpress Data Path, and eXpressed it using [[eBPF]] programs. XDP was added to Linux 4.8 and has been heavily developed since then, and is often seen together with [[Io_uring|iouring]], especially with the new <tt>AF_XDP</tt> family of sockets.
 XDP is used to bypass large chunks of the Linux networking stack (including all allocations, particularly <tt>alloc_skb()</tt>), especially when dropping packets or shuffling them between NICs.

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