mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-01-08 14:23:19 +00:00
Linux kernel source tree
6093ec2dc3
John Fastabend says: ==================== Implement XDP bpf_redirect This series adds two new XDP helper routines bpf_redirect() and bpf_redirect_map(). The first variant bpf_redirect() is meant to be used the same way it is currently being used by the cls_bpf classifier. An xdp packet will be redirected immediately when this is called. The other variant bpf_redirect_map(map, key, flags) uses a new map type called devmap. A devmap uses integers as keys and net_devices as values. The user provies key/ifindex pairs to update the map with new net_devices. This provides two benefits over the normal variant 'bpf_redirect()'. First the datapath bpf program is abstracted away from using hard-coded ifindex values. Allowing a single bpf program to be run any many different environments. Second, and perhaps more important, the map enables batching packet transmits. The map plus small driver changes allows for batching all send requests across a NAPI poll loop. This allows driver writers to optimize the driver xmit path and only call expensive operations once for a batch of xdp_buffs. The devmap was designed to support possible future work for multicast and broadcast as follow-up patches. To see, in more detail, how to leverage the new helpers and map from the userspace side please review these two patches, xdp: sample program for new bpf_redirect helper xdp: bpf redirect with map sample program Performance numbers provided by Jesper are the following, tested using the ixgbe driver with CPU E5-1650 v4 @ 3.60GHz: 13,939,674 pkt/s = XDP_DROP without touching memory 14,290,650 pkt/s = xdp1: XDP_DROP with reading packet data 13,221,812 pkt/s = xdp2: XDP_TX with swap mac (writes into pkt) 7,596,576 pkt/s = xdp_redirect: XDP_REDIRECT with swap mac (like XDP_TX) 13,058,435 pkt/s = xdp_redirect_map:XDP_REDIRECT with swap mac + devmap A big thanks to everyone who helped with this series. Jesper provided fixes, debugging, code review, performance benchmarks! Daniel provided lots of useful feedback and code review. And last but not least Andy provided useful feedback related to supporting additional drivers, generic xdp implementation, testing, etc. Any other feedback is welcome but I believe at this point these are ready to be merged! Whats left... get the rest of the drivers developers to implement this in all the drivers. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.